crypto: akcipher - Drop sign/verify operations

[linux.git] / drivers / net / ethernet / ibm / ibmvnic.c

// SPDX-License-Identifier: GPL-2.0-or-later
/**************************************************************************/
/*                                                                        */
/*  IBM System i and System p Virtual NIC Device Driver                   */
/*  Copyright (C) 2014 IBM Corp.                                          */
/*  Santiago Leon ([email protected])                                  */
/*  Thomas Falcon ([email protected])                           */
/*  John Allen ([email protected])                                */
/*                                                                        */
/*                                                                        */
/* This module contains the implementation of a virtual ethernet device   */
/* for use with IBM i/p Series LPAR Linux. It utilizes the logical LAN    */
/* option of the RS/6000 Platform Architecture to interface with virtual  */
/* ethernet NICs that are presented to the partition by the hypervisor.   */
/*                                                                         */
/* Messages are passed between the VNIC driver and the VNIC server using  */
/* Command/Response Queues (CRQs) and sub CRQs (sCRQs). CRQs are used to  */
/* issue and receive commands that initiate communication with the server */
/* on driver initialization. Sub CRQs (sCRQs) are similar to CRQs, but    */
/* are used by the driver to notify the server that a packet is           */
/* ready for transmission or that a buffer has been added to receive a    */
/* packet. Subsequently, sCRQs are used by the server to notify the       */
/* driver that a packet transmission has been completed or that a packet  */
/* has been received and placed in a waiting buffer.                      */
/*                                                                        */
/* In lieu of a more conventional "on-the-fly" DMA mapping strategy in    */
/* which skbs are DMA mapped and immediately unmapped when the transmit   */
/* or receive has been completed, the VNIC driver is required to use      */
/* "long term mapping". This entails that large, continuous DMA mapped    */
/* buffers are allocated on driver initialization and these buffers are   */
/* then continuously reused to pass skbs to and from the VNIC server.     */
/*                                                                        */
/**************************************************************************/

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/completion.h>
#include <linux/ioport.h>
#include <linux/dma-mapping.h>
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/mm.h>
#include <linux/ethtool.h>
#include <linux/proc_fs.h>
#include <linux/if_arp.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/kthread.h>
#include <linux/seq_file.h>
#include <linux/interrupt.h>
#include <net/net_namespace.h>
#include <asm/hvcall.h>
#include <linux/atomic.h>
#include <asm/vio.h>
#include <asm/xive.h>
#include <asm/iommu.h>
#include <linux/uaccess.h>
#include <asm/firmware.h>
#include <linux/workqueue.h>
#include <linux/if_vlan.h>
#include <linux/utsname.h>
#include <linux/cpu.h>

#include "ibmvnic.h"

static const char ibmvnic_driver_name[] = "ibmvnic";
static const char ibmvnic_driver_string[] = "IBM System i/p Virtual NIC Driver";

MODULE_AUTHOR("Santiago Leon");
MODULE_DESCRIPTION("IBM System i/p Virtual NIC Driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(IBMVNIC_DRIVER_VERSION);

static int ibmvnic_version = IBMVNIC_INITIAL_VERSION;
static void release_sub_crqs(struct ibmvnic_adapter *, bool);
static int ibmvnic_reset_crq(struct ibmvnic_adapter *);
static int ibmvnic_send_crq_init(struct ibmvnic_adapter *);
static int ibmvnic_reenable_crq_queue(struct ibmvnic_adapter *);
static int ibmvnic_send_crq(struct ibmvnic_adapter *, union ibmvnic_crq *);
static int send_subcrq_indirect(struct ibmvnic_adapter *, u64, u64, u64);
static irqreturn_t ibmvnic_interrupt_rx(int irq, void *instance);
static int enable_scrq_irq(struct ibmvnic_adapter *,
                           struct ibmvnic_sub_crq_queue *);
static int disable_scrq_irq(struct ibmvnic_adapter *,
                            struct ibmvnic_sub_crq_queue *);
static int pending_scrq(struct ibmvnic_adapter *,
                        struct ibmvnic_sub_crq_queue *);
static union sub_crq *ibmvnic_next_scrq(struct ibmvnic_adapter *,
                                        struct ibmvnic_sub_crq_queue *);
static int ibmvnic_poll(struct napi_struct *napi, int data);
static int reset_sub_crq_queues(struct ibmvnic_adapter *adapter);
static inline void reinit_init_done(struct ibmvnic_adapter *adapter);
static void send_query_map(struct ibmvnic_adapter *adapter);
static int send_request_map(struct ibmvnic_adapter *, dma_addr_t, u32, u8);
static int send_request_unmap(struct ibmvnic_adapter *, u8);
static int send_login(struct ibmvnic_adapter *adapter);
static void send_query_cap(struct ibmvnic_adapter *adapter);
static int init_sub_crqs(struct ibmvnic_adapter *);
static int init_sub_crq_irqs(struct ibmvnic_adapter *adapter);
static int ibmvnic_reset_init(struct ibmvnic_adapter *, bool reset);
static void release_crq_queue(struct ibmvnic_adapter *);
static int __ibmvnic_set_mac(struct net_device *, u8 *);
static int init_crq_queue(struct ibmvnic_adapter *adapter);
static int send_query_phys_parms(struct ibmvnic_adapter *adapter);
static void ibmvnic_tx_scrq_clean_buffer(struct ibmvnic_adapter *adapter,
                                         struct ibmvnic_sub_crq_queue *tx_scrq);
static void free_long_term_buff(struct ibmvnic_adapter *adapter,
                                struct ibmvnic_long_term_buff *ltb);
static void ibmvnic_disable_irqs(struct ibmvnic_adapter *adapter);
static void flush_reset_queue(struct ibmvnic_adapter *adapter);
static void print_subcrq_error(struct device *dev, int rc, const char *func);

struct ibmvnic_stat {
        char name[ETH_GSTRING_LEN];
        int offset;
};

#define IBMVNIC_STAT_OFF(stat) (offsetof(struct ibmvnic_adapter, stats) + \
                             offsetof(struct ibmvnic_statistics, stat))
#define IBMVNIC_GET_STAT(a, off) (*((u64 *)(((unsigned long)(a)) + (off))))

static const struct ibmvnic_stat ibmvnic_stats[] = {
        {"rx_packets", IBMVNIC_STAT_OFF(rx_packets)},
        {"rx_bytes", IBMVNIC_STAT_OFF(rx_bytes)},
        {"tx_packets", IBMVNIC_STAT_OFF(tx_packets)},
        {"tx_bytes", IBMVNIC_STAT_OFF(tx_bytes)},
        {"ucast_tx_packets", IBMVNIC_STAT_OFF(ucast_tx_packets)},
        {"ucast_rx_packets", IBMVNIC_STAT_OFF(ucast_rx_packets)},
        {"mcast_tx_packets", IBMVNIC_STAT_OFF(mcast_tx_packets)},
        {"mcast_rx_packets", IBMVNIC_STAT_OFF(mcast_rx_packets)},
        {"bcast_tx_packets", IBMVNIC_STAT_OFF(bcast_tx_packets)},
        {"bcast_rx_packets", IBMVNIC_STAT_OFF(bcast_rx_packets)},
        {"align_errors", IBMVNIC_STAT_OFF(align_errors)},
        {"fcs_errors", IBMVNIC_STAT_OFF(fcs_errors)},
        {"single_collision_frames", IBMVNIC_STAT_OFF(single_collision_frames)},
        {"multi_collision_frames", IBMVNIC_STAT_OFF(multi_collision_frames)},
        {"sqe_test_errors", IBMVNIC_STAT_OFF(sqe_test_errors)},
        {"deferred_tx", IBMVNIC_STAT_OFF(deferred_tx)},
        {"late_collisions", IBMVNIC_STAT_OFF(late_collisions)},
        {"excess_collisions", IBMVNIC_STAT_OFF(excess_collisions)},
        {"internal_mac_tx_errors", IBMVNIC_STAT_OFF(internal_mac_tx_errors)},
        {"carrier_sense", IBMVNIC_STAT_OFF(carrier_sense)},
        {"too_long_frames", IBMVNIC_STAT_OFF(too_long_frames)},
        {"internal_mac_rx_errors", IBMVNIC_STAT_OFF(internal_mac_rx_errors)},
};

static int send_crq_init_complete(struct ibmvnic_adapter *adapter)
{
        union ibmvnic_crq crq;

        memset(&crq, 0, sizeof(crq));
        crq.generic.first = IBMVNIC_CRQ_INIT_CMD;
        crq.generic.cmd = IBMVNIC_CRQ_INIT_COMPLETE;

        return ibmvnic_send_crq(adapter, &crq);
}

static int send_version_xchg(struct ibmvnic_adapter *adapter)
{
        union ibmvnic_crq crq;

        memset(&crq, 0, sizeof(crq));
        crq.version_exchange.first = IBMVNIC_CRQ_CMD;
        crq.version_exchange.cmd = VERSION_EXCHANGE;
        crq.version_exchange.version = cpu_to_be16(ibmvnic_version);

        return ibmvnic_send_crq(adapter, &crq);
}

static void ibmvnic_clean_queue_affinity(struct ibmvnic_adapter *adapter,
                                         struct ibmvnic_sub_crq_queue *queue)
{
        if (!(queue && queue->irq))
                return;

        cpumask_clear(queue->affinity_mask);

        if (irq_set_affinity_and_hint(queue->irq, NULL))
                netdev_warn(adapter->netdev,
                            "%s: Clear affinity failed, queue addr = %p, IRQ = %d\n",
                            __func__, queue, queue->irq);
}

static void ibmvnic_clean_affinity(struct ibmvnic_adapter *adapter)
{
        struct ibmvnic_sub_crq_queue **rxqs;
        struct ibmvnic_sub_crq_queue **txqs;
        int num_rxqs, num_txqs;
        int i;

        rxqs = adapter->rx_scrq;
        txqs = adapter->tx_scrq;
        num_txqs = adapter->num_active_tx_scrqs;
        num_rxqs = adapter->num_active_rx_scrqs;

        netdev_dbg(adapter->netdev, "%s: Cleaning irq affinity hints", __func__);
        if (txqs) {
                for (i = 0; i < num_txqs; i++)
                        ibmvnic_clean_queue_affinity(adapter, txqs[i]);
        }
        if (rxqs) {
                for (i = 0; i < num_rxqs; i++)
                        ibmvnic_clean_queue_affinity(adapter, rxqs[i]);
        }
}

static int ibmvnic_set_queue_affinity(struct ibmvnic_sub_crq_queue *queue,
                                      unsigned int *cpu, int *stragglers,
                                      int stride)
{
        cpumask_var_t mask;
        int i;
        int rc = 0;

        if (!(queue && queue->irq))
                return rc;

        /* cpumask_var_t is either a pointer or array, allocation works here */
        if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
                return -ENOMEM;

        /* while we have extra cpu give one extra to this irq */
        if (*stragglers) {
                stride++;
                (*stragglers)--;
        }
        /* atomic write is safer than writing bit by bit directly */
        for (i = 0; i < stride; i++) {
                cpumask_set_cpu(*cpu, mask);
                *cpu = cpumask_next_wrap(*cpu, cpu_online_mask,
                                         nr_cpu_ids, false);
        }
        /* set queue affinity mask */
        cpumask_copy(queue->affinity_mask, mask);
        rc = irq_set_affinity_and_hint(queue->irq, queue->affinity_mask);
        free_cpumask_var(mask);

        return rc;
}

/* assumes cpu read lock is held */
static void ibmvnic_set_affinity(struct ibmvnic_adapter *adapter)
{
        struct ibmvnic_sub_crq_queue **rxqs = adapter->rx_scrq;
        struct ibmvnic_sub_crq_queue **txqs = adapter->tx_scrq;
        struct ibmvnic_sub_crq_queue *queue;
        int num_rxqs = adapter->num_active_rx_scrqs, i_rxqs = 0;
        int num_txqs = adapter->num_active_tx_scrqs, i_txqs = 0;
        int total_queues, stride, stragglers, i;
        unsigned int num_cpu, cpu;
        bool is_rx_queue;
        int rc = 0;

        netdev_dbg(adapter->netdev, "%s: Setting irq affinity hints", __func__);
        if (!(adapter->rx_scrq && adapter->tx_scrq)) {
                netdev_warn(adapter->netdev,
                            "%s: Set affinity failed, queues not allocated\n",
                            __func__);
                return;
        }

        total_queues = num_rxqs + num_txqs;
        num_cpu = num_online_cpus();
        /* number of cpu's assigned per irq */
        stride = max_t(int, num_cpu / total_queues, 1);
        /* number of leftover cpu's */
        stragglers = num_cpu >= total_queues ? num_cpu % total_queues : 0;
        /* next available cpu to assign irq to */
        cpu = cpumask_next(-1, cpu_online_mask);

        for (i = 0; i < total_queues; i++) {
                is_rx_queue = false;
                /* balance core load by alternating rx and tx assignments
                 * ex: TX0 -> RX0 -> TX1 -> RX1 etc.
                 */
                if ((i % 2 == 1 && i_rxqs < num_rxqs) || i_txqs == num_txqs) {
                        queue = rxqs[i_rxqs++];
                        is_rx_queue = true;
                } else {
                        queue = txqs[i_txqs++];
                }

                rc = ibmvnic_set_queue_affinity(queue, &cpu, &stragglers,
                                                stride);
                if (rc)
                        goto out;

                if (!queue || is_rx_queue)
                        continue;

                rc = __netif_set_xps_queue(adapter->netdev,
                                           cpumask_bits(queue->affinity_mask),
                                           i_txqs - 1, XPS_CPUS);
                if (rc)
                        netdev_warn(adapter->netdev, "%s: Set XPS on queue %d failed, rc = %d.\n",
                                    __func__, i_txqs - 1, rc);
        }

out:
        if (rc) {
                netdev_warn(adapter->netdev,
                            "%s: Set affinity failed, queue addr = %p, IRQ = %d, rc = %d.\n",
                            __func__, queue, queue->irq, rc);
                ibmvnic_clean_affinity(adapter);
        }
}

static int ibmvnic_cpu_online(unsigned int cpu, struct hlist_node *node)
{
        struct ibmvnic_adapter *adapter;

        adapter = hlist_entry_safe(node, struct ibmvnic_adapter, node);
        ibmvnic_set_affinity(adapter);
        return 0;
}

static int ibmvnic_cpu_dead(unsigned int cpu, struct hlist_node *node)
{
        struct ibmvnic_adapter *adapter;

        adapter = hlist_entry_safe(node, struct ibmvnic_adapter, node_dead);
        ibmvnic_set_affinity(adapter);
        return 0;
}

static int ibmvnic_cpu_down_prep(unsigned int cpu, struct hlist_node *node)
{
        struct ibmvnic_adapter *adapter;

        adapter = hlist_entry_safe(node, struct ibmvnic_adapter, node);
        ibmvnic_clean_affinity(adapter);
        return 0;
}

static enum cpuhp_state ibmvnic_online;

static int ibmvnic_cpu_notif_add(struct ibmvnic_adapter *adapter)
{
        int ret;

        ret = cpuhp_state_add_instance_nocalls(ibmvnic_online, &adapter->node);
        if (ret)
                return ret;
        ret = cpuhp_state_add_instance_nocalls(CPUHP_IBMVNIC_DEAD,
                                               &adapter->node_dead);
        if (!ret)
                return ret;
        cpuhp_state_remove_instance_nocalls(ibmvnic_online, &adapter->node);
        return ret;
}

static void ibmvnic_cpu_notif_remove(struct ibmvnic_adapter *adapter)
{
        cpuhp_state_remove_instance_nocalls(ibmvnic_online, &adapter->node);
        cpuhp_state_remove_instance_nocalls(CPUHP_IBMVNIC_DEAD,
                                            &adapter->node_dead);
}

static long h_reg_sub_crq(unsigned long unit_address, unsigned long token,
                          unsigned long length, unsigned long *number,
                          unsigned long *irq)
{
        unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
        long rc;

        rc = plpar_hcall(H_REG_SUB_CRQ, retbuf, unit_address, token, length);
        *number = retbuf[0];
        *irq = retbuf[1];

        return rc;
}

/**
 * ibmvnic_wait_for_completion - Check device state and wait for completion
 * @adapter: private device data
 * @comp_done: completion structure to wait for
 * @timeout: time to wait in milliseconds
 *
 * Wait for a completion signal or until the timeout limit is reached
 * while checking that the device is still active.
 */
static int ibmvnic_wait_for_completion(struct ibmvnic_adapter *adapter,
                                       struct completion *comp_done,
                                       unsigned long timeout)
{
        struct net_device *netdev;
        unsigned long div_timeout;
        u8 retry;

        netdev = adapter->netdev;
        retry = 5;
        div_timeout = msecs_to_jiffies(timeout / retry);
        while (true) {
                if (!adapter->crq.active) {
                        netdev_err(netdev, "Device down!\n");
                        return -ENODEV;
                }
                if (!retry--)
                        break;
                if (wait_for_completion_timeout(comp_done, div_timeout))
                        return 0;
        }
        netdev_err(netdev, "Operation timed out.\n");
        return -ETIMEDOUT;
}

/**
 * reuse_ltb() - Check if a long term buffer can be reused
 * @ltb:  The long term buffer to be checked
 * @size: The size of the long term buffer.
 *
 * An LTB can be reused unless its size has changed.
 *
 * Return: Return true if the LTB can be reused, false otherwise.
 */
static bool reuse_ltb(struct ibmvnic_long_term_buff *ltb, int size)
{
        return (ltb->buff && ltb->size == size);
}

/**
 * alloc_long_term_buff() - Allocate a long term buffer (LTB)
 *
 * @adapter: ibmvnic adapter associated to the LTB
 * @ltb:     container object for the LTB
 * @size:    size of the LTB
 *
 * Allocate an LTB of the specified size and notify VIOS.
 *
 * If the given @ltb already has the correct size, reuse it. Otherwise if
 * its non-NULL, free it. Then allocate a new one of the correct size.
 * Notify the VIOS either way since we may now be working with a new VIOS.
 *
 * Allocating larger chunks of memory during resets, specially LPM or under
 * low memory situations can cause resets to fail/timeout and for LPAR to
 * lose connectivity. So hold onto the LTB even if we fail to communicate
 * with the VIOS and reuse it on next open. Free LTB when adapter is closed.
 *
 * Return: 0 if we were able to allocate the LTB and notify the VIOS and
 *         a negative value otherwise.
 */
static int alloc_long_term_buff(struct ibmvnic_adapter *adapter,
                                struct ibmvnic_long_term_buff *ltb, int size)
{
        struct device *dev = &adapter->vdev->dev;
        u64 prev = 0;
        int rc;

        if (!reuse_ltb(ltb, size)) {
                dev_dbg(dev,
                        "LTB size changed from 0x%llx to 0x%x, reallocating\n",
                         ltb->size, size);
                prev = ltb->size;
                free_long_term_buff(adapter, ltb);
        }

        if (ltb->buff) {
                dev_dbg(dev, "Reusing LTB [map %d, size 0x%llx]\n",
                        ltb->map_id, ltb->size);
        } else {
                ltb->buff = dma_alloc_coherent(dev, size, &ltb->addr,
                                               GFP_KERNEL);
                if (!ltb->buff) {
                        dev_err(dev, "Couldn't alloc long term buffer\n");
                        return -ENOMEM;
                }
                ltb->size = size;

                ltb->map_id = find_first_zero_bit(adapter->map_ids,
                                                  MAX_MAP_ID);
                bitmap_set(adapter->map_ids, ltb->map_id, 1);

                dev_dbg(dev,
                        "Allocated new LTB [map %d, size 0x%llx was 0x%llx]\n",
                         ltb->map_id, ltb->size, prev);
        }

        /* Ensure ltb is zeroed - specially when reusing it. */
        memset(ltb->buff, 0, ltb->size);

        mutex_lock(&adapter->fw_lock);
        adapter->fw_done_rc = 0;
        reinit_completion(&adapter->fw_done);

        rc = send_request_map(adapter, ltb->addr, ltb->size, ltb->map_id);
        if (rc) {
                dev_err(dev, "send_request_map failed, rc = %d\n", rc);
                goto out;
        }

        rc = ibmvnic_wait_for_completion(adapter, &adapter->fw_done, 10000);
        if (rc) {
                dev_err(dev, "LTB map request aborted or timed out, rc = %d\n",
                        rc);
                goto out;
        }

        if (adapter->fw_done_rc) {
                dev_err(dev, "Couldn't map LTB, rc = %d\n",
                        adapter->fw_done_rc);
                rc = -EIO;
                goto out;
        }
        rc = 0;
out:
        /* don't free LTB on communication error - see function header */
        mutex_unlock(&adapter->fw_lock);
        return rc;
}

static void free_long_term_buff(struct ibmvnic_adapter *adapter,
                                struct ibmvnic_long_term_buff *ltb)
{
        struct device *dev = &adapter->vdev->dev;

        if (!ltb->buff)
                return;

        /* VIOS automatically unmaps the long term buffer at remote
         * end for the following resets:
         * FAILOVER, MOBILITY, TIMEOUT.
         */
        if (adapter->reset_reason != VNIC_RESET_FAILOVER &&
            adapter->reset_reason != VNIC_RESET_MOBILITY &&
            adapter->reset_reason != VNIC_RESET_TIMEOUT)
                send_request_unmap(adapter, ltb->map_id);

        dma_free_coherent(dev, ltb->size, ltb->buff, ltb->addr);

        ltb->buff = NULL;
        /* mark this map_id free */
        bitmap_clear(adapter->map_ids, ltb->map_id, 1);
        ltb->map_id = 0;
}

/**
 * free_ltb_set - free the given set of long term buffers (LTBS)
 * @adapter: The ibmvnic adapter containing this ltb set
 * @ltb_set: The ltb_set to be freed
 *
 * Free the set of LTBs in the given set.
 */

static void free_ltb_set(struct ibmvnic_adapter *adapter,
                         struct ibmvnic_ltb_set *ltb_set)
{
        int i;

        for (i = 0; i < ltb_set->num_ltbs; i++)
                free_long_term_buff(adapter, &ltb_set->ltbs[i]);

        kfree(ltb_set->ltbs);
        ltb_set->ltbs = NULL;
        ltb_set->num_ltbs = 0;
}

/**
 * alloc_ltb_set() - Allocate a set of long term buffers (LTBs)
 *
 * @adapter: ibmvnic adapter associated to the LTB
 * @ltb_set: container object for the set of LTBs
 * @num_buffs: Number of buffers in the LTB
 * @buff_size: Size of each buffer in the LTB
 *
 * Allocate a set of LTBs to accommodate @num_buffs buffers of @buff_size
 * each. We currently cap size each LTB to IBMVNIC_ONE_LTB_SIZE. If the
 * new set of LTBs have fewer LTBs than the old set, free the excess LTBs.
 * If new set needs more than in old set, allocate the remaining ones.
 * Try and reuse as many LTBs as possible and avoid reallocation.
 *
 * Any changes to this allocation strategy must be reflected in
 * map_rxpool_buff_to_ltb() and map_txpool_buff_to_ltb().
 */
static int alloc_ltb_set(struct ibmvnic_adapter *adapter,
                         struct ibmvnic_ltb_set *ltb_set, int num_buffs,
                         int buff_size)
{
        struct device *dev = &adapter->vdev->dev;
        struct ibmvnic_ltb_set old_set;
        struct ibmvnic_ltb_set new_set;
        int rem_size;
        int tot_size;           /* size of all ltbs */
        int ltb_size;           /* size of one ltb */
        int nltbs;
        int rc;
        int n;
        int i;

        dev_dbg(dev, "%s() num_buffs %d, buff_size %d\n", __func__, num_buffs,
                buff_size);

        ltb_size = rounddown(IBMVNIC_ONE_LTB_SIZE, buff_size);
        tot_size = num_buffs * buff_size;

        if (ltb_size > tot_size)
                ltb_size = tot_size;

        nltbs = tot_size / ltb_size;
        if (tot_size % ltb_size)
                nltbs++;

        old_set = *ltb_set;

        if (old_set.num_ltbs == nltbs) {
                new_set = old_set;
        } else {
                int tmp = nltbs * sizeof(struct ibmvnic_long_term_buff);

                new_set.ltbs = kzalloc(tmp, GFP_KERNEL);
                if (!new_set.ltbs)
                        return -ENOMEM;

                new_set.num_ltbs = nltbs;

                /* Free any excess ltbs in old set */
                for (i = new_set.num_ltbs; i < old_set.num_ltbs; i++)
                        free_long_term_buff(adapter, &old_set.ltbs[i]);

                /* Copy remaining ltbs to new set. All LTBs except the
                 * last one are of the same size. alloc_long_term_buff()
                 * will realloc if the size changes.
                 */
                n = min(old_set.num_ltbs, new_set.num_ltbs);
                for (i = 0; i < n; i++)
                        new_set.ltbs[i] = old_set.ltbs[i];

                /* Any additional ltbs in new set will have NULL ltbs for
                 * now and will be allocated in alloc_long_term_buff().
                 */

                /* We no longer need the old_set so free it. Note that we
                 * may have reused some ltbs from old set and freed excess
                 * ltbs above. So we only need to free the container now
                 * not the LTBs themselves. (i.e. dont free_ltb_set()!)
                 */
                kfree(old_set.ltbs);
                old_set.ltbs = NULL;
                old_set.num_ltbs = 0;

                /* Install the new set. If allocations fail below, we will
                 * retry later and know what size LTBs we need.
                 */
                *ltb_set = new_set;
        }

        i = 0;
        rem_size = tot_size;
        while (rem_size) {
                if (ltb_size > rem_size)
                        ltb_size = rem_size;

                rem_size -= ltb_size;

                rc = alloc_long_term_buff(adapter, &new_set.ltbs[i], ltb_size);
                if (rc)
                        goto out;
                i++;
        }

        WARN_ON(i != new_set.num_ltbs);

        return 0;
out:
        /* We may have allocated one/more LTBs before failing and we
         * want to try and reuse on next reset. So don't free ltb set.
         */
        return rc;
}

/**
 * map_rxpool_buf_to_ltb - Map given rxpool buffer to offset in an LTB.
 * @rxpool: The receive buffer pool containing buffer
 * @bufidx: Index of buffer in rxpool
 * @ltbp: (Output) pointer to the long term buffer containing the buffer
 * @offset: (Output) offset of buffer in the LTB from @ltbp
 *
 * Map the given buffer identified by [rxpool, bufidx] to an LTB in the
 * pool and its corresponding offset. Assume for now that each LTB is of
 * different size but could possibly be optimized based on the allocation
 * strategy in alloc_ltb_set().
 */
static void map_rxpool_buf_to_ltb(struct ibmvnic_rx_pool *rxpool,
                                  unsigned int bufidx,
                                  struct ibmvnic_long_term_buff **ltbp,
                                  unsigned int *offset)
{
        struct ibmvnic_long_term_buff *ltb;
        int nbufs;      /* # of buffers in one ltb */
        int i;

        WARN_ON(bufidx >= rxpool->size);

        for (i = 0; i < rxpool->ltb_set.num_ltbs; i++) {
                ltb = &rxpool->ltb_set.ltbs[i];
                nbufs = ltb->size / rxpool->buff_size;
                if (bufidx < nbufs)
                        break;
                bufidx -= nbufs;
        }

        *ltbp = ltb;
        *offset = bufidx * rxpool->buff_size;
}

/**
 * map_txpool_buf_to_ltb - Map given txpool buffer to offset in an LTB.
 * @txpool: The transmit buffer pool containing buffer
 * @bufidx: Index of buffer in txpool
 * @ltbp: (Output) pointer to the long term buffer (LTB) containing the buffer
 * @offset: (Output) offset of buffer in the LTB from @ltbp
 *
 * Map the given buffer identified by [txpool, bufidx] to an LTB in the
 * pool and its corresponding offset.
 */
static void map_txpool_buf_to_ltb(struct ibmvnic_tx_pool *txpool,
                                  unsigned int bufidx,
                                  struct ibmvnic_long_term_buff **ltbp,
                                  unsigned int *offset)
{
        struct ibmvnic_long_term_buff *ltb;
        int nbufs;      /* # of buffers in one ltb */
        int i;

        WARN_ON_ONCE(bufidx >= txpool->num_buffers);

        for (i = 0; i < txpool->ltb_set.num_ltbs; i++) {
                ltb = &txpool->ltb_set.ltbs[i];
                nbufs = ltb->size / txpool->buf_size;
                if (bufidx < nbufs)
                        break;
                bufidx -= nbufs;
        }

        *ltbp = ltb;
        *offset = bufidx * txpool->buf_size;
}

static void deactivate_rx_pools(struct ibmvnic_adapter *adapter)
{
        int i;

        for (i = 0; i < adapter->num_active_rx_pools; i++)
                adapter->rx_pool[i].active = 0;
}

static void replenish_rx_pool(struct ibmvnic_adapter *adapter,
                              struct ibmvnic_rx_pool *pool)
{
        int count = pool->size - atomic_read(&pool->available);
        u64 handle = adapter->rx_scrq[pool->index]->handle;
        struct device *dev = &adapter->vdev->dev;
        struct ibmvnic_ind_xmit_queue *ind_bufp;
        struct ibmvnic_sub_crq_queue *rx_scrq;
        struct ibmvnic_long_term_buff *ltb;
        union sub_crq *sub_crq;
        int buffers_added = 0;
        unsigned long lpar_rc;
        struct sk_buff *skb;
        unsigned int offset;
        dma_addr_t dma_addr;
        unsigned char *dst;
        int shift = 0;
        int bufidx;
        int i;

        if (!pool->active)
                return;

        rx_scrq = adapter->rx_scrq[pool->index];
        ind_bufp = &rx_scrq->ind_buf;

        /* netdev_skb_alloc() could have failed after we saved a few skbs
         * in the indir_buf and we would not have sent them to VIOS yet.
         * To account for them, start the loop at ind_bufp->index rather
         * than 0. If we pushed all the skbs to VIOS, ind_bufp->index will
         * be 0.
         */
        for (i = ind_bufp->index; i < count; ++i) {
                bufidx = pool->free_map[pool->next_free];

                /* We maybe reusing the skb from earlier resets. Allocate
                 * only if necessary. But since the LTB may have changed
                 * during reset (see init_rx_pools()), update LTB below
                 * even if reusing skb.
                 */
                skb = pool->rx_buff[bufidx].skb;
                if (!skb) {
                        skb = netdev_alloc_skb(adapter->netdev,
                                               pool->buff_size);
                        if (!skb) {
                                dev_err(dev, "Couldn't replenish rx buff\n");
                                adapter->replenish_no_mem++;
                                break;
                        }
                }

                pool->free_map[pool->next_free] = IBMVNIC_INVALID_MAP;
                pool->next_free = (pool->next_free + 1) % pool->size;

                /* Copy the skb to the long term mapped DMA buffer */
                map_rxpool_buf_to_ltb(pool, bufidx, &ltb, &offset);
                dst = ltb->buff + offset;
                memset(dst, 0, pool->buff_size);
                dma_addr = ltb->addr + offset;

                /* add the skb to an rx_buff in the pool */
                pool->rx_buff[bufidx].data = dst;
                pool->rx_buff[bufidx].dma = dma_addr;
                pool->rx_buff[bufidx].skb = skb;
                pool->rx_buff[bufidx].pool_index = pool->index;
                pool->rx_buff[bufidx].size = pool->buff_size;

                /* queue the rx_buff for the next send_subcrq_indirect */
                sub_crq = &ind_bufp->indir_arr[ind_bufp->index++];
                memset(sub_crq, 0, sizeof(*sub_crq));
                sub_crq->rx_add.first = IBMVNIC_CRQ_CMD;
                sub_crq->rx_add.correlator =
                    cpu_to_be64((u64)&pool->rx_buff[bufidx]);
                sub_crq->rx_add.ioba = cpu_to_be32(dma_addr);
                sub_crq->rx_add.map_id = ltb->map_id;

                /* The length field of the sCRQ is defined to be 24 bits so the
                 * buffer size needs to be left shifted by a byte before it is
                 * converted to big endian to prevent the last byte from being
                 * truncated.
                 */
#ifdef __LITTLE_ENDIAN__
                shift = 8;
#endif
                sub_crq->rx_add.len = cpu_to_be32(pool->buff_size << shift);

                /* if send_subcrq_indirect queue is full, flush to VIOS */
                if (ind_bufp->index == IBMVNIC_MAX_IND_DESCS ||
                    i == count - 1) {
                        lpar_rc =
                                send_subcrq_indirect(adapter, handle,
                                                     (u64)ind_bufp->indir_dma,
                                                     (u64)ind_bufp->index);
                        if (lpar_rc != H_SUCCESS)
                                goto failure;
                        buffers_added += ind_bufp->index;
                        adapter->replenish_add_buff_success += ind_bufp->index;
                        ind_bufp->index = 0;
                }
        }
        atomic_add(buffers_added, &pool->available);
        return;

failure:
        if (lpar_rc != H_PARAMETER && lpar_rc != H_CLOSED)
                dev_err_ratelimited(dev, "rx: replenish packet buffer failed\n");
        for (i = ind_bufp->index - 1; i >= 0; --i) {
                struct ibmvnic_rx_buff *rx_buff;

                pool->next_free = pool->next_free == 0 ?
                                  pool->size - 1 : pool->next_free - 1;
                sub_crq = &ind_bufp->indir_arr[i];
                rx_buff = (struct ibmvnic_rx_buff *)
                                be64_to_cpu(sub_crq->rx_add.correlator);
                bufidx = (int)(rx_buff - pool->rx_buff);
                pool->free_map[pool->next_free] = bufidx;
                dev_kfree_skb_any(pool->rx_buff[bufidx].skb);
                pool->rx_buff[bufidx].skb = NULL;
        }
        adapter->replenish_add_buff_failure += ind_bufp->index;
        atomic_add(buffers_added, &pool->available);
        ind_bufp->index = 0;
        if (lpar_rc == H_CLOSED || adapter->failover_pending) {
                /* Disable buffer pool replenishment and report carrier off if
                 * queue is closed or pending failover.
                 * Firmware guarantees that a signal will be sent to the
                 * driver, triggering a reset.
                 */
                deactivate_rx_pools(adapter);
                netif_carrier_off(adapter->netdev);
        }
}

static void replenish_pools(struct ibmvnic_adapter *adapter)
{
        int i;

        adapter->replenish_task_cycles++;
        for (i = 0; i < adapter->num_active_rx_pools; i++) {
                if (adapter->rx_pool[i].active)
                        replenish_rx_pool(adapter, &adapter->rx_pool[i]);
        }

        netdev_dbg(adapter->netdev, "Replenished %d pools\n", i);
}

static void release_stats_buffers(struct ibmvnic_adapter *adapter)
{
        kfree(adapter->tx_stats_buffers);
        kfree(adapter->rx_stats_buffers);
        adapter->tx_stats_buffers = NULL;
        adapter->rx_stats_buffers = NULL;
}

static int init_stats_buffers(struct ibmvnic_adapter *adapter)
{
        adapter->tx_stats_buffers =
                                kcalloc(IBMVNIC_MAX_QUEUES,
                                        sizeof(struct ibmvnic_tx_queue_stats),
                                        GFP_KERNEL);
        if (!adapter->tx_stats_buffers)
                return -ENOMEM;

        adapter->rx_stats_buffers =
                                kcalloc(IBMVNIC_MAX_QUEUES,
                                        sizeof(struct ibmvnic_rx_queue_stats),
                                        GFP_KERNEL);
        if (!adapter->rx_stats_buffers)
                return -ENOMEM;

        return 0;
}

static void release_stats_token(struct ibmvnic_adapter *adapter)
{
        struct device *dev = &adapter->vdev->dev;

        if (!adapter->stats_token)
                return;

        dma_unmap_single(dev, adapter->stats_token,
                         sizeof(struct ibmvnic_statistics),
                         DMA_FROM_DEVICE);
        adapter->stats_token = 0;
}

static int init_stats_token(struct ibmvnic_adapter *adapter)
{
        struct device *dev = &adapter->vdev->dev;
        dma_addr_t stok;
        int rc;

        stok = dma_map_single(dev, &adapter->stats,
                              sizeof(struct ibmvnic_statistics),
                              DMA_FROM_DEVICE);
        rc = dma_mapping_error(dev, stok);
        if (rc) {
                dev_err(dev, "Couldn't map stats buffer, rc = %d\n", rc);
                return rc;
        }

        adapter->stats_token = stok;
        netdev_dbg(adapter->netdev, "Stats token initialized (%llx)\n", stok);
        return 0;
}

/**
 * release_rx_pools() - Release any rx pools attached to @adapter.
 * @adapter: ibmvnic adapter
 *
 * Safe to call this multiple times - even if no pools are attached.
 */
static void release_rx_pools(struct ibmvnic_adapter *adapter)
{
        struct ibmvnic_rx_pool *rx_pool;
        int i, j;

        if (!adapter->rx_pool)
                return;

        for (i = 0; i < adapter->num_active_rx_pools; i++) {
                rx_pool = &adapter->rx_pool[i];

                netdev_dbg(adapter->netdev, "Releasing rx_pool[%d]\n", i);

                kfree(rx_pool->free_map);

                free_ltb_set(adapter, &rx_pool->ltb_set);

                if (!rx_pool->rx_buff)
                        continue;

                for (j = 0; j < rx_pool->size; j++) {
                        if (rx_pool->rx_buff[j].skb) {
                                dev_kfree_skb_any(rx_pool->rx_buff[j].skb);
                                rx_pool->rx_buff[j].skb = NULL;
                        }
                }

                kfree(rx_pool->rx_buff);
        }

        kfree(adapter->rx_pool);
        adapter->rx_pool = NULL;
        adapter->num_active_rx_pools = 0;
        adapter->prev_rx_pool_size = 0;
}

/**
 * reuse_rx_pools() - Check if the existing rx pools can be reused.
 * @adapter: ibmvnic adapter
 *
 * Check if the existing rx pools in the adapter can be reused. The
 * pools can be reused if the pool parameters (number of pools,
 * number of buffers in the pool and size of each buffer) have not
 * changed.
 *
 * NOTE: This assumes that all pools have the same number of buffers
 *       which is the case currently. If that changes, we must fix this.
 *
 * Return: true if the rx pools can be reused, false otherwise.
 */
static bool reuse_rx_pools(struct ibmvnic_adapter *adapter)
{
        u64 old_num_pools, new_num_pools;
        u64 old_pool_size, new_pool_size;
        u64 old_buff_size, new_buff_size;

        if (!adapter->rx_pool)
                return false;

        old_num_pools = adapter->num_active_rx_pools;
        new_num_pools = adapter->req_rx_queues;

        old_pool_size = adapter->prev_rx_pool_size;
        new_pool_size = adapter->req_rx_add_entries_per_subcrq;

        old_buff_size = adapter->prev_rx_buf_sz;
        new_buff_size = adapter->cur_rx_buf_sz;

        if (old_buff_size != new_buff_size ||
            old_num_pools != new_num_pools ||
            old_pool_size != new_pool_size)
                return false;

        return true;
}

/**
 * init_rx_pools(): Initialize the set of receiver pools in the adapter.
 * @netdev: net device associated with the vnic interface
 *
 * Initialize the set of receiver pools in the ibmvnic adapter associated
 * with the net_device @netdev. If possible, reuse the existing rx pools.
 * Otherwise free any existing pools and  allocate a new set of pools
 * before initializing them.
 *
 * Return: 0 on success and negative value on error.
 */
static int init_rx_pools(struct net_device *netdev)
{
        struct ibmvnic_adapter *adapter = netdev_priv(netdev);
        struct device *dev = &adapter->vdev->dev;
        struct ibmvnic_rx_pool *rx_pool;
        u64 num_pools;
        u64 pool_size;          /* # of buffers in one pool */
        u64 buff_size;
        int i, j, rc;

        pool_size = adapter->req_rx_add_entries_per_subcrq;
        num_pools = adapter->req_rx_queues;
        buff_size = adapter->cur_rx_buf_sz;

        if (reuse_rx_pools(adapter)) {
                dev_dbg(dev, "Reusing rx pools\n");
                goto update_ltb;
        }

        /* Allocate/populate the pools. */
        release_rx_pools(adapter);

        adapter->rx_pool = kcalloc(num_pools,
                                   sizeof(struct ibmvnic_rx_pool),
                                   GFP_KERNEL);
        if (!adapter->rx_pool) {
                dev_err(dev, "Failed to allocate rx pools\n");
                return -ENOMEM;
        }

        /* Set num_active_rx_pools early. If we fail below after partial
         * allocation, release_rx_pools() will know how many to look for.
         */
        adapter->num_active_rx_pools = num_pools;

        for (i = 0; i < num_pools; i++) {
                rx_pool = &adapter->rx_pool[i];

                netdev_dbg(adapter->netdev,
                           "Initializing rx_pool[%d], %lld buffs, %lld bytes each\n",
                           i, pool_size, buff_size);

                rx_pool->size = pool_size;
                rx_pool->index = i;
                rx_pool->buff_size = ALIGN(buff_size, L1_CACHE_BYTES);

                rx_pool->free_map = kcalloc(rx_pool->size, sizeof(int),
                                            GFP_KERNEL);
                if (!rx_pool->free_map) {
                        dev_err(dev, "Couldn't alloc free_map %d\n", i);
                        rc = -ENOMEM;
                        goto out_release;
                }

                rx_pool->rx_buff = kcalloc(rx_pool->size,
                                           sizeof(struct ibmvnic_rx_buff),
                                           GFP_KERNEL);
                if (!rx_pool->rx_buff) {
                        dev_err(dev, "Couldn't alloc rx buffers\n");
                        rc = -ENOMEM;
                        goto out_release;
                }
        }

        adapter->prev_rx_pool_size = pool_size;
        adapter->prev_rx_buf_sz = adapter->cur_rx_buf_sz;

update_ltb:
        for (i = 0; i < num_pools; i++) {
                rx_pool = &adapter->rx_pool[i];
                dev_dbg(dev, "Updating LTB for rx pool %d [%d, %d]\n",
                        i, rx_pool->size, rx_pool->buff_size);

                rc = alloc_ltb_set(adapter, &rx_pool->ltb_set,
                                   rx_pool->size, rx_pool->buff_size);
                if (rc)
                        goto out;

                for (j = 0; j < rx_pool->size; ++j) {
                        struct ibmvnic_rx_buff *rx_buff;

                        rx_pool->free_map[j] = j;

                        /* NOTE: Don't clear rx_buff->skb here - will leak
                         * memory! replenish_rx_pool() will reuse skbs or
                         * allocate as necessary.
                         */
                        rx_buff = &rx_pool->rx_buff[j];
                        rx_buff->dma = 0;
                        rx_buff->data = 0;
                        rx_buff->size = 0;
                        rx_buff->pool_index = 0;
                }

                /* Mark pool "empty" so replenish_rx_pools() will
                 * update the LTB info for each buffer
                 */
                atomic_set(&rx_pool->available, 0);
                rx_pool->next_alloc = 0;
                rx_pool->next_free = 0;
                /* replenish_rx_pool() may have called deactivate_rx_pools()
                 * on failover. Ensure pool is active now.
                 */
                rx_pool->active = 1;
        }
        return 0;
out_release:
        release_rx_pools(adapter);
out:
        /* We failed to allocate one or more LTBs or map them on the VIOS.
         * Hold onto the pools and any LTBs that we did allocate/map.
         */
        return rc;
}

static void release_vpd_data(struct ibmvnic_adapter *adapter)
{
        if (!adapter->vpd)
                return;

        kfree(adapter->vpd->buff);
        kfree(adapter->vpd);

        adapter->vpd = NULL;
}

static void release_one_tx_pool(struct ibmvnic_adapter *adapter,
                                struct ibmvnic_tx_pool *tx_pool)
{
        kfree(tx_pool->tx_buff);
        kfree(tx_pool->free_map);
        free_ltb_set(adapter, &tx_pool->ltb_set);
}

/**
 * release_tx_pools() - Release any tx pools attached to @adapter.
 * @adapter: ibmvnic adapter
 *
 * Safe to call this multiple times - even if no pools are attached.
 */
static void release_tx_pools(struct ibmvnic_adapter *adapter)
{
        int i;

        /* init_tx_pools() ensures that ->tx_pool and ->tso_pool are
         * both NULL or both non-NULL. So we only need to check one.
         */
        if (!adapter->tx_pool)
                return;

        for (i = 0; i < adapter->num_active_tx_pools; i++) {
                release_one_tx_pool(adapter, &adapter->tx_pool[i]);
                release_one_tx_pool(adapter, &adapter->tso_pool[i]);
        }

        kfree(adapter->tx_pool);
        adapter->tx_pool = NULL;
        kfree(adapter->tso_pool);
        adapter->tso_pool = NULL;
        adapter->num_active_tx_pools = 0;
        adapter->prev_tx_pool_size = 0;
}

static int init_one_tx_pool(struct net_device *netdev,
                            struct ibmvnic_tx_pool *tx_pool,
                            int pool_size, int buf_size)
{
        int i;

        tx_pool->tx_buff = kcalloc(pool_size,
                                   sizeof(struct ibmvnic_tx_buff),
                                   GFP_KERNEL);
        if (!tx_pool->tx_buff)
                return -ENOMEM;

        tx_pool->free_map = kcalloc(pool_size, sizeof(int), GFP_KERNEL);
        if (!tx_pool->free_map) {
                kfree(tx_pool->tx_buff);
                tx_pool->tx_buff = NULL;
                return -ENOMEM;
        }

        for (i = 0; i < pool_size; i++)
                tx_pool->free_map[i] = i;

        tx_pool->consumer_index = 0;
        tx_pool->producer_index = 0;
        tx_pool->num_buffers = pool_size;
        tx_pool->buf_size = buf_size;

        return 0;
}

/**
 * reuse_tx_pools() - Check if the existing tx pools can be reused.
 * @adapter: ibmvnic adapter
 *
 * Check if the existing tx pools in the adapter can be reused. The
 * pools can be reused if the pool parameters (number of pools,
 * number of buffers in the pool and mtu) have not changed.
 *
 * NOTE: This assumes that all pools have the same number of buffers
 *       which is the case currently. If that changes, we must fix this.
 *
 * Return: true if the tx pools can be reused, false otherwise.
 */
static bool reuse_tx_pools(struct ibmvnic_adapter *adapter)
{
        u64 old_num_pools, new_num_pools;
        u64 old_pool_size, new_pool_size;
        u64 old_mtu, new_mtu;

        if (!adapter->tx_pool)
                return false;

        old_num_pools = adapter->num_active_tx_pools;
        new_num_pools = adapter->num_active_tx_scrqs;
        old_pool_size = adapter->prev_tx_pool_size;
        new_pool_size = adapter->req_tx_entries_per_subcrq;
        old_mtu = adapter->prev_mtu;
        new_mtu = adapter->req_mtu;

        if (old_mtu != new_mtu ||
            old_num_pools != new_num_pools ||
            old_pool_size != new_pool_size)
                return false;

        return true;
}

/**
 * init_tx_pools(): Initialize the set of transmit pools in the adapter.
 * @netdev: net device associated with the vnic interface
 *
 * Initialize the set of transmit pools in the ibmvnic adapter associated
 * with the net_device @netdev. If possible, reuse the existing tx pools.
 * Otherwise free any existing pools and  allocate a new set of pools
 * before initializing them.
 *
 * Return: 0 on success and negative value on error.
 */
static int init_tx_pools(struct net_device *netdev)
{
        struct ibmvnic_adapter *adapter = netdev_priv(netdev);
        struct device *dev = &adapter->vdev->dev;
        int num_pools;
        u64 pool_size;          /* # of buffers in pool */
        u64 buff_size;
        int i, j, rc;

        num_pools = adapter->req_tx_queues;

        /* We must notify the VIOS about the LTB on all resets - but we only
         * need to alloc/populate pools if either the number of buffers or
         * size of each buffer in the pool has changed.
         */
        if (reuse_tx_pools(adapter)) {
                netdev_dbg(netdev, "Reusing tx pools\n");
                goto update_ltb;
        }

        /* Allocate/populate the pools. */
        release_tx_pools(adapter);

        pool_size = adapter->req_tx_entries_per_subcrq;
        num_pools = adapter->num_active_tx_scrqs;

        adapter->tx_pool = kcalloc(num_pools,
                                   sizeof(struct ibmvnic_tx_pool), GFP_KERNEL);
        if (!adapter->tx_pool)
                return -ENOMEM;

        adapter->tso_pool = kcalloc(num_pools,
                                    sizeof(struct ibmvnic_tx_pool), GFP_KERNEL);
        /* To simplify release_tx_pools() ensure that ->tx_pool and
         * ->tso_pool are either both NULL or both non-NULL.
         */
        if (!adapter->tso_pool) {
                kfree(adapter->tx_pool);
                adapter->tx_pool = NULL;
                return -ENOMEM;
        }

        /* Set num_active_tx_pools early. If we fail below after partial
         * allocation, release_tx_pools() will know how many to look for.
         */
        adapter->num_active_tx_pools = num_pools;

        buff_size = adapter->req_mtu + VLAN_HLEN;
        buff_size = ALIGN(buff_size, L1_CACHE_BYTES);

        for (i = 0; i < num_pools; i++) {
                dev_dbg(dev, "Init tx pool %d [%llu, %llu]\n",
                        i, adapter->req_tx_entries_per_subcrq, buff_size);

                rc = init_one_tx_pool(netdev, &adapter->tx_pool[i],
                                      pool_size, buff_size);
                if (rc)
                        goto out_release;

                rc = init_one_tx_pool(netdev, &adapter->tso_pool[i],
                                      IBMVNIC_TSO_BUFS,
                                      IBMVNIC_TSO_BUF_SZ);
                if (rc)
                        goto out_release;
        }

        adapter->prev_tx_pool_size = pool_size;
        adapter->prev_mtu = adapter->req_mtu;

update_ltb:
        /* NOTE: All tx_pools have the same number of buffers (which is
         *       same as pool_size). All tso_pools have IBMVNIC_TSO_BUFS
         *       buffers (see calls init_one_tx_pool() for these).
         *       For consistency, we use tx_pool->num_buffers and
         *       tso_pool->num_buffers below.
         */
        rc = -1;
        for (i = 0; i < num_pools; i++) {
                struct ibmvnic_tx_pool *tso_pool;
                struct ibmvnic_tx_pool *tx_pool;

                tx_pool = &adapter->tx_pool[i];

                dev_dbg(dev, "Updating LTB for tx pool %d [%d, %d]\n",
                        i, tx_pool->num_buffers, tx_pool->buf_size);

                rc = alloc_ltb_set(adapter, &tx_pool->ltb_set,
                                   tx_pool->num_buffers, tx_pool->buf_size);
                if (rc)
                        goto out;

                tx_pool->consumer_index = 0;
                tx_pool->producer_index = 0;

                for (j = 0; j < tx_pool->num_buffers; j++)
                        tx_pool->free_map[j] = j;

                tso_pool = &adapter->tso_pool[i];

                dev_dbg(dev, "Updating LTB for tso pool %d [%d, %d]\n",
                        i, tso_pool->num_buffers, tso_pool->buf_size);

                rc = alloc_ltb_set(adapter, &tso_pool->ltb_set,
                                   tso_pool->num_buffers, tso_pool->buf_size);
                if (rc)
                        goto out;

                tso_pool->consumer_index = 0;
                tso_pool->producer_index = 0;

                for (j = 0; j < tso_pool->num_buffers; j++)
                        tso_pool->free_map[j] = j;
        }

        return 0;
out_release:
        release_tx_pools(adapter);
out:
        /* We failed to allocate one or more LTBs or map them on the VIOS.
         * Hold onto the pools and any LTBs that we did allocate/map.
         */
        return rc;
}

static void ibmvnic_napi_enable(struct ibmvnic_adapter *adapter)
{
        int i;

        if (adapter->napi_enabled)
                return;

        for (i = 0; i < adapter->req_rx_queues; i++)
                napi_enable(&adapter->napi[i]);

        adapter->napi_enabled = true;
}

static void ibmvnic_napi_disable(struct ibmvnic_adapter *adapter)
{
        int i;

        if (!adapter->napi_enabled)
                return;

        for (i = 0; i < adapter->req_rx_queues; i++) {
                netdev_dbg(adapter->netdev, "Disabling napi[%d]\n", i);
                napi_disable(&adapter->napi[i]);
        }

        adapter->napi_enabled = false;
}

static int init_napi(struct ibmvnic_adapter *adapter)
{
        int i;

        adapter->napi = kcalloc(adapter->req_rx_queues,
                                sizeof(struct napi_struct), GFP_KERNEL);
        if (!adapter->napi)
                return -ENOMEM;

        for (i = 0; i < adapter->req_rx_queues; i++) {
                netdev_dbg(adapter->netdev, "Adding napi[%d]\n", i);
                netif_napi_add(adapter->netdev, &adapter->napi[i],
                               ibmvnic_poll);
        }

        adapter->num_active_rx_napi = adapter->req_rx_queues;
        return 0;
}

static void release_napi(struct ibmvnic_adapter *adapter)
{
        int i;

        if (!adapter->napi)
                return;

        for (i = 0; i < adapter->num_active_rx_napi; i++) {
                netdev_dbg(adapter->netdev, "Releasing napi[%d]\n", i);
                netif_napi_del(&adapter->napi[i]);
        }

        kfree(adapter->napi);
        adapter->napi = NULL;
        adapter->num_active_rx_napi = 0;
        adapter->napi_enabled = false;
}

static const char *adapter_state_to_string(enum vnic_state state)
{
        switch (state) {
        case VNIC_PROBING:
                return "PROBING";
        case VNIC_PROBED:
                return "PROBED";
        case VNIC_OPENING:
                return "OPENING";
        case VNIC_OPEN:
                return "OPEN";
        case VNIC_CLOSING:
                return "CLOSING";
        case VNIC_CLOSED:
                return "CLOSED";
        case VNIC_REMOVING:
                return "REMOVING";
        case VNIC_REMOVED:
                return "REMOVED";
        case VNIC_DOWN:
                return "DOWN";
        }
        return "UNKNOWN";
}

static int ibmvnic_login(struct net_device *netdev)
{
        unsigned long flags, timeout = msecs_to_jiffies(20000);
        struct ibmvnic_adapter *adapter = netdev_priv(netdev);
        int retry_count = 0;
        int retries = 10;
        bool retry;
        int rc;

        do {
                retry = false;
                if (retry_count > retries) {
                        netdev_warn(netdev, "Login attempts exceeded\n");
                        return -EACCES;
                }

                adapter->init_done_rc = 0;
                reinit_completion(&adapter->init_done);
                rc = send_login(adapter);
                if (rc)
                        return rc;

                if (!wait_for_completion_timeout(&adapter->init_done,
                                                 timeout)) {
                        netdev_warn(netdev, "Login timed out\n");
                        adapter->login_pending = false;
                        goto partial_reset;
                }

                if (adapter->init_done_rc == ABORTED) {
                        netdev_warn(netdev, "Login aborted, retrying...\n");
                        retry = true;
                        adapter->init_done_rc = 0;
                        retry_count++;
                        /* FW or device may be busy, so
                         * wait a bit before retrying login
                         */
                        msleep(500);
                } else if (adapter->init_done_rc == PARTIALSUCCESS) {
                        retry_count++;
                        release_sub_crqs(adapter, 1);

                        retry = true;
                        netdev_dbg(netdev,
                                   "Received partial success, retrying...\n");
                        adapter->init_done_rc = 0;
                        reinit_completion(&adapter->init_done);
                        send_query_cap(adapter);
                        if (!wait_for_completion_timeout(&adapter->init_done,
                                                         timeout)) {
                                netdev_warn(netdev,
                                            "Capabilities query timed out\n");
                                return -ETIMEDOUT;
                        }

                        rc = init_sub_crqs(adapter);
                        if (rc) {
                                netdev_warn(netdev,
                                            "SCRQ initialization failed\n");
                                return rc;
                        }

                        rc = init_sub_crq_irqs(adapter);
                        if (rc) {
                                netdev_warn(netdev,
                                            "SCRQ irq initialization failed\n");
                                return rc;
                        }
                /* Default/timeout error handling, reset and start fresh */
                } else if (adapter->init_done_rc) {
                        netdev_warn(netdev, "Adapter login failed, init_done_rc = %d\n",
                                    adapter->init_done_rc);

partial_reset:
                        /* adapter login failed, so free any CRQs or sub-CRQs
                         * and register again before attempting to login again.
                         * If we don't do this then the VIOS may think that
                         * we are already logged in and reject any subsequent
                         * attempts
                         */
                        netdev_warn(netdev,
                                    "Freeing and re-registering CRQs before attempting to login again\n");
                        retry = true;
                        adapter->init_done_rc = 0;
                        release_sub_crqs(adapter, true);
                        /* Much of this is similar logic as ibmvnic_probe(),
                         * we are essentially re-initializing communication
                         * with the server. We really should not run any
                         * resets/failovers here because this is already a form
                         * of reset and we do not want parallel resets occurring
                         */
                        do {
                                reinit_init_done(adapter);
                                /* Clear any failovers we got in the previous
                                 * pass since we are re-initializing the CRQ
                                 */
                                adapter->failover_pending = false;
                                release_crq_queue(adapter);
                                /* If we don't sleep here then we risk an
                                 * unnecessary failover event from the VIOS.
                                 * This is a known VIOS issue caused by a vnic
                                 * device freeing and registering a CRQ too
                                 * quickly.
                                 */
                                msleep(1500);
                                /* Avoid any resets, since we are currently
                                 * resetting.
                                 */
                                spin_lock_irqsave(&adapter->rwi_lock, flags);
                                flush_reset_queue(adapter);
                                spin_unlock_irqrestore(&adapter->rwi_lock,
                                                       flags);

                                rc = init_crq_queue(adapter);
                                if (rc) {
                                        netdev_err(netdev, "login recovery: init CRQ failed %d\n",
                                                   rc);
                                        return -EIO;
                                }

                                rc = ibmvnic_reset_init(adapter, false);
                                if (rc)
                                        netdev_err(netdev, "login recovery: Reset init failed %d\n",
                                                   rc);
                                /* IBMVNIC_CRQ_INIT will return EAGAIN if it
                                 * fails, since ibmvnic_reset_init will free
                                 * irq's in failure, we won't be able to receive
                                 * new CRQs so we need to keep trying. probe()
                                 * handles this similarly.
                                 */
                        } while (rc == -EAGAIN && retry_count++ < retries);
                }
        } while (retry);

        __ibmvnic_set_mac(netdev, adapter->mac_addr);

        netdev_dbg(netdev, "[S:%s] Login succeeded\n", adapter_state_to_string(adapter->state));
        return 0;
}

static void release_login_buffer(struct ibmvnic_adapter *adapter)
{
        if (!adapter->login_buf)
                return;

        dma_unmap_single(&adapter->vdev->dev, adapter->login_buf_token,
                         adapter->login_buf_sz, DMA_TO_DEVICE);
        kfree(adapter->login_buf);
        adapter->login_buf = NULL;
}

static void release_login_rsp_buffer(struct ibmvnic_adapter *adapter)
{
        if (!adapter->login_rsp_buf)
                return;

        dma_unmap_single(&adapter->vdev->dev, adapter->login_rsp_buf_token,
                         adapter->login_rsp_buf_sz, DMA_FROM_DEVICE);
        kfree(adapter->login_rsp_buf);
        adapter->login_rsp_buf = NULL;
}

static void release_resources(struct ibmvnic_adapter *adapter)
{
        release_vpd_data(adapter);

        release_napi(adapter);
        release_login_buffer(adapter);
        release_login_rsp_buffer(adapter);
}

static int set_link_state(struct ibmvnic_adapter *adapter, u8 link_state)
{
        struct net_device *netdev = adapter->netdev;
        unsigned long timeout = msecs_to_jiffies(20000);
        union ibmvnic_crq crq;
        bool resend;
        int rc;

        netdev_dbg(netdev, "setting link state %d\n", link_state);

        memset(&crq, 0, sizeof(crq));
        crq.logical_link_state.first = IBMVNIC_CRQ_CMD;
        crq.logical_link_state.cmd = LOGICAL_LINK_STATE;
        crq.logical_link_state.link_state = link_state;

        do {
                resend = false;

                reinit_completion(&adapter->init_done);
                rc = ibmvnic_send_crq(adapter, &crq);
                if (rc) {
                        netdev_err(netdev, "Failed to set link state\n");
                        return rc;
                }

                if (!wait_for_completion_timeout(&adapter->init_done,
                                                 timeout)) {
                        netdev_err(netdev, "timeout setting link state\n");
                        return -ETIMEDOUT;
                }

                if (adapter->init_done_rc == PARTIALSUCCESS) {
                        /* Partuial success, delay and re-send */
                        mdelay(1000);
                        resend = true;
                } else if (adapter->init_done_rc) {
                        netdev_warn(netdev, "Unable to set link state, rc=%d\n",
                                    adapter->init_done_rc);
                        return adapter->init_done_rc;
                }
        } while (resend);

        return 0;
}

static int set_real_num_queues(struct net_device *netdev)
{
        struct ibmvnic_adapter *adapter = netdev_priv(netdev);
        int rc;

        netdev_dbg(netdev, "Setting real tx/rx queues (%llx/%llx)\n",
                   adapter->req_tx_queues, adapter->req_rx_queues);

        rc = netif_set_real_num_tx_queues(netdev, adapter->req_tx_queues);
        if (rc) {
                netdev_err(netdev, "failed to set the number of tx queues\n");
                return rc;
        }

        rc = netif_set_real_num_rx_queues(netdev, adapter->req_rx_queues);
        if (rc)
                netdev_err(netdev, "failed to set the number of rx queues\n");

        return rc;
}

static int ibmvnic_get_vpd(struct ibmvnic_adapter *adapter)
{
        struct device *dev = &adapter->vdev->dev;
        union ibmvnic_crq crq;
        int len = 0;
        int rc;

        if (adapter->vpd->buff)
                len = adapter->vpd->len;

        mutex_lock(&adapter->fw_lock);
        adapter->fw_done_rc = 0;
        reinit_completion(&adapter->fw_done);

        crq.get_vpd_size.first = IBMVNIC_CRQ_CMD;
        crq.get_vpd_size.cmd = GET_VPD_SIZE;
        rc = ibmvnic_send_crq(adapter, &crq);
        if (rc) {
                mutex_unlock(&adapter->fw_lock);
                return rc;
        }

        rc = ibmvnic_wait_for_completion(adapter, &adapter->fw_done, 10000);
        if (rc) {
                dev_err(dev, "Could not retrieve VPD size, rc = %d\n", rc);
                mutex_unlock(&adapter->fw_lock);
                return rc;
        }
        mutex_unlock(&adapter->fw_lock);

        if (!adapter->vpd->len)
                return -ENODATA;

        if (!adapter->vpd->buff)
                adapter->vpd->buff = kzalloc(adapter->vpd->len, GFP_KERNEL);
        else if (adapter->vpd->len != len)
                adapter->vpd->buff =
                        krealloc(adapter->vpd->buff,
                                 adapter->vpd->len, GFP_KERNEL);

        if (!adapter->vpd->buff) {
                dev_err(dev, "Could allocate VPD buffer\n");
                return -ENOMEM;
        }

        adapter->vpd->dma_addr =
                dma_map_single(dev, adapter->vpd->buff, adapter->vpd->len,
                               DMA_FROM_DEVICE);
        if (dma_mapping_error(dev, adapter->vpd->dma_addr)) {
                dev_err(dev, "Could not map VPD buffer\n");
                kfree(adapter->vpd->buff);
                adapter->vpd->buff = NULL;
                return -ENOMEM;
        }

        mutex_lock(&adapter->fw_lock);
        adapter->fw_done_rc = 0;
        reinit_completion(&adapter->fw_done);

        crq.get_vpd.first = IBMVNIC_CRQ_CMD;
        crq.get_vpd.cmd = GET_VPD;
        crq.get_vpd.ioba = cpu_to_be32(adapter->vpd->dma_addr);
        crq.get_vpd.len = cpu_to_be32((u32)adapter->vpd->len);
        rc = ibmvnic_send_crq(adapter, &crq);
        if (rc) {
                kfree(adapter->vpd->buff);
                adapter->vpd->buff = NULL;
                mutex_unlock(&adapter->fw_lock);
                return rc;
        }

        rc = ibmvnic_wait_for_completion(adapter, &adapter->fw_done, 10000);
        if (rc) {
                dev_err(dev, "Unable to retrieve VPD, rc = %d\n", rc);
                kfree(adapter->vpd->buff);
                adapter->vpd->buff = NULL;
                mutex_unlock(&adapter->fw_lock);
                return rc;
        }

        mutex_unlock(&adapter->fw_lock);
        return 0;
}

static int init_resources(struct ibmvnic_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;
        int rc;

        rc = set_real_num_queues(netdev);
        if (rc)
                return rc;

        adapter->vpd = kzalloc(sizeof(*adapter->vpd), GFP_KERNEL);
        if (!adapter->vpd)
                return -ENOMEM;

        /* Vital Product Data (VPD) */
        rc = ibmvnic_get_vpd(adapter);
        if (rc) {
                netdev_err(netdev, "failed to initialize Vital Product Data (VPD)\n");
                return rc;
        }

        rc = init_napi(adapter);
        if (rc)
                return rc;

        send_query_map(adapter);

        rc = init_rx_pools(netdev);
        if (rc)
                return rc;

        rc = init_tx_pools(netdev);
        return rc;
}

static int __ibmvnic_open(struct net_device *netdev)
{
        struct ibmvnic_adapter *adapter = netdev_priv(netdev);
        enum vnic_state prev_state = adapter->state;
        int i, rc;

        adapter->state = VNIC_OPENING;
        replenish_pools(adapter);
        ibmvnic_napi_enable(adapter);

        /* We're ready to receive frames, enable the sub-crq interrupts and
         * set the logical link state to up
         */
        for (i = 0; i < adapter->req_rx_queues; i++) {
                netdev_dbg(netdev, "Enabling rx_scrq[%d] irq\n", i);
                if (prev_state == VNIC_CLOSED)
                        enable_irq(adapter->rx_scrq[i]->irq);
                enable_scrq_irq(adapter, adapter->rx_scrq[i]);
        }

        for (i = 0; i < adapter->req_tx_queues; i++) {
                netdev_dbg(netdev, "Enabling tx_scrq[%d] irq\n", i);
                if (prev_state == VNIC_CLOSED)
                        enable_irq(adapter->tx_scrq[i]->irq);
                enable_scrq_irq(adapter, adapter->tx_scrq[i]);
                /* netdev_tx_reset_queue will reset dql stats. During NON_FATAL
                 * resets, don't reset the stats because there could be batched
                 * skb's waiting to be sent. If we reset dql stats, we risk
                 * num_completed being greater than num_queued. This will cause
                 * a BUG_ON in dql_completed().
                 */
                if (adapter->reset_reason != VNIC_RESET_NON_FATAL)
                        netdev_tx_reset_queue(netdev_get_tx_queue(netdev, i));
        }

        rc = set_link_state(adapter, IBMVNIC_LOGICAL_LNK_UP);
        if (rc) {
                ibmvnic_napi_disable(adapter);
                ibmvnic_disable_irqs(adapter);
                return rc;
        }

        adapter->tx_queues_active = true;

        /* Since queues were stopped until now, there shouldn't be any
         * one in ibmvnic_complete_tx() or ibmvnic_xmit() so maybe we
         * don't need the synchronize_rcu()? Leaving it for consistency
         * with setting ->tx_queues_active = false.
         */
        synchronize_rcu();

        netif_tx_start_all_queues(netdev);

        if (prev_state == VNIC_CLOSED) {
                for (i = 0; i < adapter->req_rx_queues; i++)
                        napi_schedule(&adapter->napi[i]);
        }

        adapter->state = VNIC_OPEN;
        return rc;
}

static int ibmvnic_open(struct net_device *netdev)
{
        struct ibmvnic_adapter *adapter = netdev_priv(netdev);
        int rc;

        ASSERT_RTNL();

        /* If device failover is pending or we are about to reset, just set
         * device state and return. Device operation will be handled by reset
         * routine.
         *
         * It should be safe to overwrite the adapter->state here. Since
         * we hold the rtnl, either the reset has not actually started or
         * the rtnl got dropped during the set_link_state() in do_reset().
         * In the former case, no one else is changing the state (again we
         * have the rtnl) and in the latter case, do_reset() will detect and
         * honor our setting below.
         */
        if (adapter->failover_pending || (test_bit(0, &adapter->resetting))) {
                netdev_dbg(netdev, "[S:%s FOP:%d] Resetting, deferring open\n",
                           adapter_state_to_string(adapter->state),
                           adapter->failover_pending);
                adapter->state = VNIC_OPEN;
                rc = 0;
                goto out;
        }

        if (adapter->state != VNIC_CLOSED) {
                rc = ibmvnic_login(netdev);
                if (rc)
                        goto out;

                rc = init_resources(adapter);
                if (rc) {
                        netdev_err(netdev, "failed to initialize resources\n");
                        goto out;
                }
        }

        rc = __ibmvnic_open(netdev);

out:
        /* If open failed and there is a pending failover or in-progress reset,
         * set device state and return. Device operation will be handled by
         * reset routine. See also comments above regarding rtnl.
         */
        if (rc &&
            (adapter->failover_pending || (test_bit(0, &adapter->resetting)))) {
                adapter->state = VNIC_OPEN;
                rc = 0;
        }

        if (rc) {
                release_resources(adapter);
                release_rx_pools(adapter);
                release_tx_pools(adapter);
        }

        return rc;
}

static void clean_rx_pools(struct ibmvnic_adapter *adapter)
{
        struct ibmvnic_rx_pool *rx_pool;
        struct ibmvnic_rx_buff *rx_buff;
        u64 rx_entries;
        int rx_scrqs;
        int i, j;

        if (!adapter->rx_pool)
                return;

        rx_scrqs = adapter->num_active_rx_pools;
        rx_entries = adapter->req_rx_add_entries_per_subcrq;

        /* Free any remaining skbs in the rx buffer pools */
        for (i = 0; i < rx_scrqs; i++) {
                rx_pool = &adapter->rx_pool[i];
                if (!rx_pool || !rx_pool->rx_buff)
                        continue;

                netdev_dbg(adapter->netdev, "Cleaning rx_pool[%d]\n", i);
                for (j = 0; j < rx_entries; j++) {
                        rx_buff = &rx_pool->rx_buff[j];
                        if (rx_buff && rx_buff->skb) {
                                dev_kfree_skb_any(rx_buff->skb);
                                rx_buff->skb = NULL;
                        }
                }
        }
}

static void clean_one_tx_pool(struct ibmvnic_adapter *adapter,
                              struct ibmvnic_tx_pool *tx_pool)
{
        struct ibmvnic_tx_buff *tx_buff;
        u64 tx_entries;
        int i;

        if (!tx_pool || !tx_pool->tx_buff)
                return;

        tx_entries = tx_pool->num_buffers;

        for (i = 0; i < tx_entries; i++) {
                tx_buff = &tx_pool->tx_buff[i];
                if (tx_buff && tx_buff->skb) {
                        dev_kfree_skb_any(tx_buff->skb);
                        tx_buff->skb = NULL;
                }
        }
}

static void clean_tx_pools(struct ibmvnic_adapter *adapter)
{
        int tx_scrqs;
        int i;

        if (!adapter->tx_pool || !adapter->tso_pool)
                return;

        tx_scrqs = adapter->num_active_tx_pools;

        /* Free any remaining skbs in the tx buffer pools */
        for (i = 0; i < tx_scrqs; i++) {
                netdev_dbg(adapter->netdev, "Cleaning tx_pool[%d]\n", i);
                clean_one_tx_pool(adapter, &adapter->tx_pool[i]);
                clean_one_tx_pool(adapter, &adapter->tso_pool[i]);
        }
}

static void ibmvnic_disable_irqs(struct ibmvnic_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;
        int i;

        if (adapter->tx_scrq) {
                for (i = 0; i < adapter->req_tx_queues; i++)
                        if (adapter->tx_scrq[i]->irq) {
                                netdev_dbg(netdev,
                                           "Disabling tx_scrq[%d] irq\n", i);
                                disable_scrq_irq(adapter, adapter->tx_scrq[i]);
                                disable_irq(adapter->tx_scrq[i]->irq);
                        }
        }

        if (adapter->rx_scrq) {
                for (i = 0; i < adapter->req_rx_queues; i++) {
                        if (adapter->rx_scrq[i]->irq) {
                                netdev_dbg(netdev,
                                           "Disabling rx_scrq[%d] irq\n", i);
                                disable_scrq_irq(adapter, adapter->rx_scrq[i]);
                                disable_irq(adapter->rx_scrq[i]->irq);
                        }
                }
        }
}

static void ibmvnic_cleanup(struct net_device *netdev)
{
        struct ibmvnic_adapter *adapter = netdev_priv(netdev);

        /* ensure that transmissions are stopped if called by do_reset */

        adapter->tx_queues_active = false;

        /* Ensure complete_tx() and ibmvnic_xmit() see ->tx_queues_active
         * update so they don't restart a queue after we stop it below.
         */
        synchronize_rcu();

        if (test_bit(0, &adapter->resetting))
                netif_tx_disable(netdev);
        else
                netif_tx_stop_all_queues(netdev);

        ibmvnic_napi_disable(adapter);
        ibmvnic_disable_irqs(adapter);
}

static int __ibmvnic_close(struct net_device *netdev)
{
        struct ibmvnic_adapter *adapter = netdev_priv(netdev);
        int rc = 0;

        adapter->state = VNIC_CLOSING;
        rc = set_link_state(adapter, IBMVNIC_LOGICAL_LNK_DN);
        adapter->state = VNIC_CLOSED;
        return rc;
}

static int ibmvnic_close(struct net_device *netdev)
{
        struct ibmvnic_adapter *adapter = netdev_priv(netdev);
        int rc;

        netdev_dbg(netdev, "[S:%s FOP:%d FRR:%d] Closing\n",
                   adapter_state_to_string(adapter->state),
                   adapter->failover_pending,
                   adapter->force_reset_recovery);

        /* If device failover is pending, just set device state and return.
         * Device operation will be handled by reset routine.
         */
        if (adapter->failover_pending) {
                adapter->state = VNIC_CLOSED;
                return 0;
        }

        rc = __ibmvnic_close(netdev);
        ibmvnic_cleanup(netdev);
        clean_rx_pools(adapter);
        clean_tx_pools(adapter);

        return rc;
}

/**
 * get_hdr_lens - fills list of L2/L3/L4 hdr lens
 * @hdr_field: bitfield determining needed headers
 * @skb: socket buffer
 * @hdr_len: array of header lengths to be filled
 *
 * Reads hdr_field to determine which headers are needed by firmware.
 * Builds a buffer containing these headers.  Saves individual header
 * lengths and total buffer length to be used to build descriptors.
 *
 * Return: total len of all headers
 */
static int get_hdr_lens(u8 hdr_field, struct sk_buff *skb,
                        int *hdr_len)
{
        int len = 0;


        if ((hdr_field >> 6) & 1) {
                hdr_len[0] = skb_mac_header_len(skb);
                len += hdr_len[0];
        }

        if ((hdr_field >> 5) & 1) {
                hdr_len[1] = skb_network_header_len(skb);
                len += hdr_len[1];
        }

        if (!((hdr_field >> 4) & 1))
                return len;

        if (skb->protocol == htons(ETH_P_IP)) {
                if (ip_hdr(skb)->protocol == IPPROTO_TCP)
                        hdr_len[2] = tcp_hdrlen(skb);
                else if (ip_hdr(skb)->protocol == IPPROTO_UDP)
                        hdr_len[2] = sizeof(struct udphdr);
        } else if (skb->protocol == htons(ETH_P_IPV6)) {
                if (ipv6_hdr(skb)->nexthdr == IPPROTO_TCP)
                        hdr_len[2] = tcp_hdrlen(skb);
                else if (ipv6_hdr(skb)->nexthdr == IPPROTO_UDP)
                        hdr_len[2] = sizeof(struct udphdr);
        }

        return len + hdr_len[2];
}

/**
 * create_hdr_descs - create header and header extension descriptors
 * @hdr_field: bitfield determining needed headers
 * @hdr_data: buffer containing header data
 * @len: length of data buffer
 * @hdr_len: array of individual header lengths
 * @scrq_arr: descriptor array
 *
 * Creates header and, if needed, header extension descriptors and
 * places them in a descriptor array, scrq_arr
 *
 * Return: Number of header descs
 */

static int create_hdr_descs(u8 hdr_field, u8 *hdr_data, int len, int *hdr_len,
                            union sub_crq *scrq_arr)
{
        union sub_crq *hdr_desc;
        int tmp_len = len;
        int num_descs = 0;
        u8 *data, *cur;
        int tmp;

        while (tmp_len > 0) {
                cur = hdr_data + len - tmp_len;

                hdr_desc = &scrq_arr[num_descs];
                if (num_descs) {
                        data = hdr_desc->hdr_ext.data;
                        tmp = tmp_len > 29 ? 29 : tmp_len;
                        hdr_desc->hdr_ext.first = IBMVNIC_CRQ_CMD;
                        hdr_desc->hdr_ext.type = IBMVNIC_HDR_EXT_DESC;
                        hdr_desc->hdr_ext.len = tmp;
                } else {
                        data = hdr_desc->hdr.data;
                        tmp = tmp_len > 24 ? 24 : tmp_len;
                        hdr_desc->hdr.first = IBMVNIC_CRQ_CMD;
                        hdr_desc->hdr.type = IBMVNIC_HDR_DESC;
                        hdr_desc->hdr.len = tmp;
                        hdr_desc->hdr.l2_len = (u8)hdr_len[0];
                        hdr_desc->hdr.l3_len = cpu_to_be16((u16)hdr_len[1]);
                        hdr_desc->hdr.l4_len = (u8)hdr_len[2];
                        hdr_desc->hdr.flag = hdr_field << 1;
                }
                memcpy(data, cur, tmp);
                tmp_len -= tmp;
                num_descs++;
        }

        return num_descs;
}

/**
 * build_hdr_descs_arr - build a header descriptor array
 * @skb: tx socket buffer
 * @indir_arr: indirect array
 * @num_entries: number of descriptors to be sent
 * @hdr_field: bit field determining which headers will be sent
 *
 * This function will build a TX descriptor array with applicable
 * L2/L3/L4 packet header descriptors to be sent by send_subcrq_indirect.
 */

static void build_hdr_descs_arr(struct sk_buff *skb,
                                union sub_crq *indir_arr,
                                int *num_entries, u8 hdr_field)
{
        int hdr_len[3] = {0, 0, 0};
        int tot_len;

        tot_len = get_hdr_lens(hdr_field, skb, hdr_len);
        *num_entries += create_hdr_descs(hdr_field, skb_mac_header(skb),
                                         tot_len, hdr_len, indir_arr + 1);
}

static int ibmvnic_xmit_workarounds(struct sk_buff *skb,
                                    struct net_device *netdev)
{
        /* For some backing devices, mishandling of small packets
         * can result in a loss of connection or TX stall. Device
         * architects recommend that no packet should be smaller
         * than the minimum MTU value provided to the driver, so
         * pad any packets to that length
         */
        if (skb->len < netdev->min_mtu)
                return skb_put_padto(skb, netdev->min_mtu);

        return 0;
}

static void ibmvnic_tx_scrq_clean_buffer(struct ibmvnic_adapter *adapter,
                                         struct ibmvnic_sub_crq_queue *tx_scrq)
{
        struct ibmvnic_ind_xmit_queue *ind_bufp;
        struct ibmvnic_tx_buff *tx_buff;
        struct ibmvnic_tx_pool *tx_pool;
        union sub_crq tx_scrq_entry;
        int queue_num;
        int entries;
        int index;
        int i;

        ind_bufp = &tx_scrq->ind_buf;
        entries = (u64)ind_bufp->index;
        queue_num = tx_scrq->pool_index;

        for (i = entries - 1; i >= 0; --i) {
                tx_scrq_entry = ind_bufp->indir_arr[i];
                if (tx_scrq_entry.v1.type != IBMVNIC_TX_DESC)
                        continue;
                index = be32_to_cpu(tx_scrq_entry.v1.correlator);
                if (index & IBMVNIC_TSO_POOL_MASK) {
                        tx_pool = &adapter->tso_pool[queue_num];
                        index &= ~IBMVNIC_TSO_POOL_MASK;
                } else {
                        tx_pool = &adapter->tx_pool[queue_num];
                }
                tx_pool->free_map[tx_pool->consumer_index] = index;
                tx_pool->consumer_index = tx_pool->consumer_index == 0 ?
                                          tx_pool->num_buffers - 1 :
                                          tx_pool->consumer_index - 1;
                tx_buff = &tx_pool->tx_buff[index];
                adapter->netdev->stats.tx_packets--;
                adapter->netdev->stats.tx_bytes -= tx_buff->skb->len;
                adapter->tx_stats_buffers[queue_num].packets--;
                adapter->tx_stats_buffers[queue_num].bytes -=
                                                tx_buff->skb->len;
                dev_kfree_skb_any(tx_buff->skb);
                tx_buff->skb = NULL;
                adapter->netdev->stats.tx_dropped++;
        }

        ind_bufp->index = 0;

        if (atomic_sub_return(entries, &tx_scrq->used) <=
            (adapter->req_tx_entries_per_subcrq / 2) &&
            __netif_subqueue_stopped(adapter->netdev, queue_num)) {
                rcu_read_lock();

                if (adapter->tx_queues_active) {
                        netif_wake_subqueue(adapter->netdev, queue_num);
                        netdev_dbg(adapter->netdev, "Started queue %d\n",
                                   queue_num);
                }

                rcu_read_unlock();
        }
}

static int send_subcrq_direct(struct ibmvnic_adapter *adapter,
                              u64 remote_handle, u64 *entry)
{
        unsigned int ua = adapter->vdev->unit_address;
        struct device *dev = &adapter->vdev->dev;
        int rc;

        /* Make sure the hypervisor sees the complete request */
        dma_wmb();
        rc = plpar_hcall_norets(H_SEND_SUB_CRQ, ua,
                                cpu_to_be64(remote_handle),
                                cpu_to_be64(entry[0]), cpu_to_be64(entry[1]),
                                cpu_to_be64(entry[2]), cpu_to_be64(entry[3]));

        if (rc)
                print_subcrq_error(dev, rc, __func__);

        return rc;
}

static int ibmvnic_tx_scrq_flush(struct ibmvnic_adapter *adapter,
                                 struct ibmvnic_sub_crq_queue *tx_scrq,
                                 bool indirect)
{
        struct ibmvnic_ind_xmit_queue *ind_bufp;
        u64 dma_addr;
        u64 entries;
        u64 handle;
        int rc;

        ind_bufp = &tx_scrq->ind_buf;
        dma_addr = (u64)ind_bufp->indir_dma;
        entries = (u64)ind_bufp->index;
        handle = tx_scrq->handle;

        if (!entries)
                return 0;

        if (indirect)
                rc = send_subcrq_indirect(adapter, handle, dma_addr, entries);
        else
                rc = send_subcrq_direct(adapter, handle,
                                        (u64 *)ind_bufp->indir_arr);

        if (rc)
                ibmvnic_tx_scrq_clean_buffer(adapter, tx_scrq);
        else
                ind_bufp->index = 0;
        return rc;
}

static netdev_tx_t ibmvnic_xmit(struct sk_buff *skb, struct net_device *netdev)
{
        struct ibmvnic_adapter *adapter = netdev_priv(netdev);
        int queue_num = skb_get_queue_mapping(skb);
        u8 *hdrs = (u8 *)&adapter->tx_rx_desc_req;
        struct device *dev = &adapter->vdev->dev;
        struct ibmvnic_ind_xmit_queue *ind_bufp;
        struct ibmvnic_tx_buff *tx_buff = NULL;
        struct ibmvnic_sub_crq_queue *tx_scrq;
        struct ibmvnic_long_term_buff *ltb;
        struct ibmvnic_tx_pool *tx_pool;
        unsigned int tx_send_failed = 0;
        netdev_tx_t ret = NETDEV_TX_OK;
        unsigned int tx_map_failed = 0;
        union sub_crq indir_arr[16];
        unsigned int tx_dropped = 0;
        unsigned int tx_packets = 0;
        unsigned int tx_bytes = 0;
        dma_addr_t data_dma_addr;
        struct netdev_queue *txq;
        unsigned long lpar_rc;
        union sub_crq tx_crq;
        unsigned int offset;
        bool use_scrq_send_direct = false;
        int num_entries = 1;
        unsigned char *dst;
        int bufidx = 0;
        u8 proto = 0;

        /* If a reset is in progress, drop the packet since
         * the scrqs may get torn down. Otherwise use the
         * rcu to ensure reset waits for us to complete.
         */
        rcu_read_lock();
        if (!adapter->tx_queues_active) {
                dev_kfree_skb_any(skb);

                tx_send_failed++;
                tx_dropped++;
                ret = NETDEV_TX_OK;
                goto out;
        }

        tx_scrq = adapter->tx_scrq[queue_num];
        txq = netdev_get_tx_queue(netdev, queue_num);
        ind_bufp = &tx_scrq->ind_buf;

        if (ibmvnic_xmit_workarounds(skb, netdev)) {
                tx_dropped++;
                tx_send_failed++;
                ret = NETDEV_TX_OK;
                lpar_rc = ibmvnic_tx_scrq_flush(adapter, tx_scrq, true);
                if (lpar_rc != H_SUCCESS)
                        goto tx_err;
                goto out;
        }

        if (skb_is_gso(skb))
                tx_pool = &adapter->tso_pool[queue_num];
        else
                tx_pool = &adapter->tx_pool[queue_num];

        bufidx = tx_pool->free_map[tx_pool->consumer_index];

        if (bufidx == IBMVNIC_INVALID_MAP) {
                dev_kfree_skb_any(skb);
                tx_send_failed++;
                tx_dropped++;
                ret = NETDEV_TX_OK;
                lpar_rc = ibmvnic_tx_scrq_flush(adapter, tx_scrq, true);
                if (lpar_rc != H_SUCCESS)
                        goto tx_err;
                goto out;
        }

        tx_pool->free_map[tx_pool->consumer_index] = IBMVNIC_INVALID_MAP;

        map_txpool_buf_to_ltb(tx_pool, bufidx, &ltb, &offset);

        dst = ltb->buff + offset;
        memset(dst, 0, tx_pool->buf_size);
        data_dma_addr = ltb->addr + offset;

        /* if we are going to send_subcrq_direct this then we need to
         * update the checksum before copying the data into ltb. Essentially
         * these packets force disable CSO so that we can guarantee that
         * FW does not need header info and we can send direct.
         */
        if (!skb_is_gso(skb) && !ind_bufp->index && !netdev_xmit_more()) {
                use_scrq_send_direct = true;
                if (skb->ip_summed == CHECKSUM_PARTIAL &&
                    skb_checksum_help(skb))
                        use_scrq_send_direct = false;
        }

        if (skb_shinfo(skb)->nr_frags) {
                int cur, i;

                /* Copy the head */
                skb_copy_from_linear_data(skb, dst, skb_headlen(skb));
                cur = skb_headlen(skb);

                /* Copy the frags */
                for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
                        const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];

                        memcpy(dst + cur, skb_frag_address(frag),
                               skb_frag_size(frag));
                        cur += skb_frag_size(frag);
                }
        } else {
                skb_copy_from_linear_data(skb, dst, skb->len);
        }

        tx_pool->consumer_index =
            (tx_pool->consumer_index + 1) % tx_pool->num_buffers;

        tx_buff = &tx_pool->tx_buff[bufidx];

        /* Sanity checks on our free map to make sure it points to an index
         * that is not being occupied by another skb. If skb memory is
         * not freed then we see congestion control kick in and halt tx.
         */
        if (unlikely(tx_buff->skb)) {
                dev_warn_ratelimited(dev, "TX free map points to untracked skb (%s %d idx=%d)\n",
                                     skb_is_gso(skb) ? "tso_pool" : "tx_pool",
                                     queue_num, bufidx);
                dev_kfree_skb_any(tx_buff->skb);
        }

        tx_buff->skb = skb;
        tx_buff->index = bufidx;
        tx_buff->pool_index = queue_num;

        memset(&tx_crq, 0, sizeof(tx_crq));
        tx_crq.v1.first = IBMVNIC_CRQ_CMD;
        tx_crq.v1.type = IBMVNIC_TX_DESC;
        tx_crq.v1.n_crq_elem = 1;
        tx_crq.v1.n_sge = 1;
        tx_crq.v1.flags1 = IBMVNIC_TX_COMP_NEEDED;

        if (skb_is_gso(skb))
                tx_crq.v1.correlator =
                        cpu_to_be32(bufidx | IBMVNIC_TSO_POOL_MASK);
        else
                tx_crq.v1.correlator = cpu_to_be32(bufidx);
        tx_crq.v1.dma_reg = cpu_to_be16(ltb->map_id);
        tx_crq.v1.sge_len = cpu_to_be32(skb->len);
        tx_crq.v1.ioba = cpu_to_be64(data_dma_addr);

        if (adapter->vlan_header_insertion && skb_vlan_tag_present(skb)) {
                tx_crq.v1.flags2 |= IBMVNIC_TX_VLAN_INSERT;
                tx_crq.v1.vlan_id = cpu_to_be16(skb->vlan_tci);
        }

        if (skb->protocol == htons(ETH_P_IP)) {
                tx_crq.v1.flags1 |= IBMVNIC_TX_PROT_IPV4;
                proto = ip_hdr(skb)->protocol;
        } else if (skb->protocol == htons(ETH_P_IPV6)) {
                tx_crq.v1.flags1 |= IBMVNIC_TX_PROT_IPV6;
                proto = ipv6_hdr(skb)->nexthdr;
        }

        if (proto == IPPROTO_TCP)
                tx_crq.v1.flags1 |= IBMVNIC_TX_PROT_TCP;
        else if (proto == IPPROTO_UDP)
                tx_crq.v1.flags1 |= IBMVNIC_TX_PROT_UDP;

        if (skb->ip_summed == CHECKSUM_PARTIAL) {
                tx_crq.v1.flags1 |= IBMVNIC_TX_CHKSUM_OFFLOAD;
                hdrs += 2;
        }
        if (skb_is_gso(skb)) {
                tx_crq.v1.flags1 |= IBMVNIC_TX_LSO;
                tx_crq.v1.mss = cpu_to_be16(skb_shinfo(skb)->gso_size);
                hdrs += 2;
        } else if (use_scrq_send_direct) {
                /* See above comment, CSO disabled with direct xmit */
                tx_crq.v1.flags1 &= ~(IBMVNIC_TX_CHKSUM_OFFLOAD);
                ind_bufp->index = 1;
                tx_buff->num_entries = 1;
                netdev_tx_sent_queue(txq, skb->len);
                ind_bufp->indir_arr[0] = tx_crq;
                lpar_rc = ibmvnic_tx_scrq_flush(adapter, tx_scrq, false);
                if (lpar_rc != H_SUCCESS)
                        goto tx_err;

                goto early_exit;
        }

        if ((*hdrs >> 7) & 1)
                build_hdr_descs_arr(skb, indir_arr, &num_entries, *hdrs);

        tx_crq.v1.n_crq_elem = num_entries;
        tx_buff->num_entries = num_entries;
        /* flush buffer if current entry can not fit */
        if (num_entries + ind_bufp->index > IBMVNIC_MAX_IND_DESCS) {
                lpar_rc = ibmvnic_tx_scrq_flush(adapter, tx_scrq, true);
                if (lpar_rc != H_SUCCESS)
                        goto tx_flush_err;
        }

        indir_arr[0] = tx_crq;
        memcpy(&ind_bufp->indir_arr[ind_bufp->index], &indir_arr[0],
               num_entries * sizeof(struct ibmvnic_generic_scrq));

        ind_bufp->index += num_entries;
        if (__netdev_tx_sent_queue(txq, skb->len,
                                   netdev_xmit_more() &&
                                   ind_bufp->index < IBMVNIC_MAX_IND_DESCS)) {
                lpar_rc = ibmvnic_tx_scrq_flush(adapter, tx_scrq, true);
                if (lpar_rc != H_SUCCESS)
                        goto tx_err;
        }

early_exit:
        if (atomic_add_return(num_entries, &tx_scrq->used)
                                        >= adapter->req_tx_entries_per_subcrq) {
                netdev_dbg(netdev, "Stopping queue %d\n", queue_num);
                netif_stop_subqueue(netdev, queue_num);
        }

        tx_packets++;
        tx_bytes += skb->len;
        txq_trans_cond_update(txq);
        ret = NETDEV_TX_OK;
        goto out;

tx_flush_err:
        dev_kfree_skb_any(skb);
        tx_buff->skb = NULL;
        tx_pool->consumer_index = tx_pool->consumer_index == 0 ?
                                  tx_pool->num_buffers - 1 :
                                  tx_pool->consumer_index - 1;
        tx_dropped++;
tx_err:
        if (lpar_rc != H_CLOSED && lpar_rc != H_PARAMETER)
                dev_err_ratelimited(dev, "tx: send failed\n");

        if (lpar_rc == H_CLOSED || adapter->failover_pending) {
                /* Disable TX and report carrier off if queue is closed
                 * or pending failover.
                 * Firmware guarantees that a signal will be sent to the
                 * driver, triggering a reset or some other action.
                 */
                netif_tx_stop_all_queues(netdev);
                netif_carrier_off(netdev);
        }
out:
        rcu_read_unlock();
        netdev->stats.tx_dropped += tx_dropped;
        netdev->stats.tx_bytes += tx_bytes;
        netdev->stats.tx_packets += tx_packets;
        adapter->tx_send_failed += tx_send_failed;
        adapter->tx_map_failed += tx_map_failed;
        adapter->tx_stats_buffers[queue_num].packets += tx_packets;
        adapter->tx_stats_buffers[queue_num].bytes += tx_bytes;
        adapter->tx_stats_buffers[queue_num].dropped_packets += tx_dropped;

        return ret;
}

static void ibmvnic_set_multi(struct net_device *netdev)
{
        struct ibmvnic_adapter *adapter = netdev_priv(netdev);
        struct netdev_hw_addr *ha;
        union ibmvnic_crq crq;

        memset(&crq, 0, sizeof(crq));
        crq.request_capability.first = IBMVNIC_CRQ_CMD;
        crq.request_capability.cmd = REQUEST_CAPABILITY;

        if (netdev->flags & IFF_PROMISC) {
                if (!adapter->promisc_supported)
                        return;
        } else {
                if (netdev->flags & IFF_ALLMULTI) {
                        /* Accept all multicast */
                        memset(&crq, 0, sizeof(crq));
                        crq.multicast_ctrl.first = IBMVNIC_CRQ_CMD;
                        crq.multicast_ctrl.cmd = MULTICAST_CTRL;
                        crq.multicast_ctrl.flags = IBMVNIC_ENABLE_ALL;
                        ibmvnic_send_crq(adapter, &crq);
                } else if (netdev_mc_empty(netdev)) {
                        /* Reject all multicast */
                        memset(&crq, 0, sizeof(crq));
                        crq.multicast_ctrl.first = IBMVNIC_CRQ_CMD;
                        crq.multicast_ctrl.cmd = MULTICAST_CTRL;
                        crq.multicast_ctrl.flags = IBMVNIC_DISABLE_ALL;
                        ibmvnic_send_crq(adapter, &crq);
                } else {
                        /* Accept one or more multicast(s) */
                        netdev_for_each_mc_addr(ha, netdev) {
                                memset(&crq, 0, sizeof(crq));
                                crq.multicast_ctrl.first = IBMVNIC_CRQ_CMD;
                                crq.multicast_ctrl.cmd = MULTICAST_CTRL;
                                crq.multicast_ctrl.flags = IBMVNIC_ENABLE_MC;
                                ether_addr_copy(&crq.multicast_ctrl.mac_addr[0],
                                                ha->addr);
                                ibmvnic_send_crq(adapter, &crq);
                        }
                }
        }
}

static int __ibmvnic_set_mac(struct net_device *netdev, u8 *dev_addr)
{
        struct ibmvnic_adapter *adapter = netdev_priv(netdev);
        union ibmvnic_crq crq;
        int rc;

        if (!is_valid_ether_addr(dev_addr)) {
                rc = -EADDRNOTAVAIL;
                goto err;
        }

        memset(&crq, 0, sizeof(crq));
        crq.change_mac_addr.first = IBMVNIC_CRQ_CMD;
        crq.change_mac_addr.cmd = CHANGE_MAC_ADDR;
        ether_addr_copy(&crq.change_mac_addr.mac_addr[0], dev_addr);

        mutex_lock(&adapter->fw_lock);
        adapter->fw_done_rc = 0;
        reinit_completion(&adapter->fw_done);

        rc = ibmvnic_send_crq(adapter, &crq);
        if (rc) {
                rc = -EIO;
                mutex_unlock(&adapter->fw_lock);
                goto err;
        }

        rc = ibmvnic_wait_for_completion(adapter, &adapter->fw_done, 10000);
        /* netdev->dev_addr is changed in handle_change_mac_rsp function */
        if (rc || adapter->fw_done_rc) {
                rc = -EIO;
                mutex_unlock(&adapter->fw_lock);
                goto err;
        }
        mutex_unlock(&adapter->fw_lock);
        return 0;
err:
        ether_addr_copy(adapter->mac_addr, netdev->dev_addr);
        return rc;
}

static int ibmvnic_set_mac(struct net_device *netdev, void *p)
{
        struct ibmvnic_adapter *adapter = netdev_priv(netdev);
        struct sockaddr *addr = p;
        int rc;

        rc = 0;
        if (!is_valid_ether_addr(addr->sa_data))
                return -EADDRNOTAVAIL;

        ether_addr_copy(adapter->mac_addr, addr->sa_data);
        if (adapter->state != VNIC_PROBED)
                rc = __ibmvnic_set_mac(netdev, addr->sa_data);

        return rc;
}

static const char *reset_reason_to_string(enum ibmvnic_reset_reason reason)
{
        switch (reason) {
        case VNIC_RESET_FAILOVER:
                return "FAILOVER";
        case VNIC_RESET_MOBILITY:
                return "MOBILITY";
        case VNIC_RESET_FATAL:
                return "FATAL";
        case VNIC_RESET_NON_FATAL:
                return "NON_FATAL";
        case VNIC_RESET_TIMEOUT:
                return "TIMEOUT";
        case VNIC_RESET_CHANGE_PARAM:
                return "CHANGE_PARAM";
        case VNIC_RESET_PASSIVE_INIT:
                return "PASSIVE_INIT";
        }
        return "UNKNOWN";
}

/*
 * Initialize the init_done completion and return code values. We
 * can get a transport event just after registering the CRQ and the
 * tasklet will use this to communicate the transport event. To ensure
 * we don't miss the notification/error, initialize these _before_
 * regisering the CRQ.
 */
static inline void reinit_init_done(struct ibmvnic_adapter *adapter)
{
        reinit_completion(&adapter->init_done);
        adapter->init_done_rc = 0;
}

/*
 * do_reset returns zero if we are able to keep processing reset events, or
 * non-zero if we hit a fatal error and must halt.
 */
static int do_reset(struct ibmvnic_adapter *adapter,
                    struct ibmvnic_rwi *rwi, u32 reset_state)
{
        struct net_device *netdev = adapter->netdev;
        u64 old_num_rx_queues, old_num_tx_queues;
        u64 old_num_rx_slots, old_num_tx_slots;
        int rc;

        netdev_dbg(adapter->netdev,
                   "[S:%s FOP:%d] Reset reason: %s, reset_state: %s\n",
                   adapter_state_to_string(adapter->state),
                   adapter->failover_pending,
                   reset_reason_to_string(rwi->reset_reason),
                   adapter_state_to_string(reset_state));

        adapter->reset_reason = rwi->reset_reason;
        /* requestor of VNIC_RESET_CHANGE_PARAM already has the rtnl lock */
        if (!(adapter->reset_reason == VNIC_RESET_CHANGE_PARAM))
                rtnl_lock();

        /* Now that we have the rtnl lock, clear any pending failover.
         * This will ensure ibmvnic_open() has either completed or will
         * block until failover is complete.
         */
        if (rwi->reset_reason == VNIC_RESET_FAILOVER)
                adapter->failover_pending = false;

        /* read the state and check (again) after getting rtnl */
        reset_state = adapter->state;

        if (reset_state == VNIC_REMOVING || reset_state == VNIC_REMOVED) {
                rc = -EBUSY;
                goto out;
        }

        netif_carrier_off(netdev);

        old_num_rx_queues = adapter->req_rx_queues;
        old_num_tx_queues = adapter->req_tx_queues;
        old_num_rx_slots = adapter->req_rx_add_entries_per_subcrq;
        old_num_tx_slots = adapter->req_tx_entries_per_subcrq;

        ibmvnic_cleanup(netdev);

        if (reset_state == VNIC_OPEN &&
            adapter->reset_reason != VNIC_RESET_MOBILITY &&
            adapter->reset_reason != VNIC_RESET_FAILOVER) {
                if (adapter->reset_reason == VNIC_RESET_CHANGE_PARAM) {
                        rc = __ibmvnic_close(netdev);
                        if (rc)
                                goto out;
                } else {
                        adapter->state = VNIC_CLOSING;

                        /* Release the RTNL lock before link state change and
                         * re-acquire after the link state change to allow
                         * linkwatch_event to grab the RTNL lock and run during
                         * a reset.
                         */
                        rtnl_unlock();
                        rc = set_link_state(adapter, IBMVNIC_LOGICAL_LNK_DN);
                        rtnl_lock();
                        if (rc)
                                goto out;

                        if (adapter->state == VNIC_OPEN) {
                                /* When we dropped rtnl, ibmvnic_open() got
                                 * it and noticed that we are resetting and
                                 * set the adapter state to OPEN. Update our
                                 * new "target" state, and resume the reset
                                 * from VNIC_CLOSING state.
                                 */
                                netdev_dbg(netdev,
                                           "Open changed state from %s, updating.\n",
                                           adapter_state_to_string(reset_state));
                                reset_state = VNIC_OPEN;
                                adapter->state = VNIC_CLOSING;
                        }

                        if (adapter->state != VNIC_CLOSING) {
                                /* If someone else changed the adapter state
                                 * when we dropped the rtnl, fail the reset
                                 */
                                rc = -EAGAIN;
                                goto out;
                        }
                        adapter->state = VNIC_CLOSED;
                }
        }

        if (adapter->reset_reason == VNIC_RESET_CHANGE_PARAM) {
                release_resources(adapter);
                release_sub_crqs(adapter, 1);
                release_crq_queue(adapter);
        }

        if (adapter->reset_reason != VNIC_RESET_NON_FATAL) {
                /* remove the closed state so when we call open it appears
                 * we are coming from the probed state.
                 */
                adapter->state = VNIC_PROBED;

                reinit_init_done(adapter);

                if (adapter->reset_reason == VNIC_RESET_CHANGE_PARAM) {
                        rc = init_crq_queue(adapter);
                } else if (adapter->reset_reason == VNIC_RESET_MOBILITY) {
                        rc = ibmvnic_reenable_crq_queue(adapter);
                        release_sub_crqs(adapter, 1);
                } else {
                        rc = ibmvnic_reset_crq(adapter);
                        if (rc == H_CLOSED || rc == H_SUCCESS) {
                                rc = vio_enable_interrupts(adapter->vdev);
                                if (rc)
                                        netdev_err(adapter->netdev,
                                                   "Reset failed to enable interrupts. rc=%d\n",
                                                   rc);
                        }
                }

                if (rc) {
                        netdev_err(adapter->netdev,
                                   "Reset couldn't initialize crq. rc=%d\n", rc);
                        goto out;
                }

                rc = ibmvnic_reset_init(adapter, true);
                if (rc)
                        goto out;

                /* If the adapter was in PROBE or DOWN state prior to the reset,
                 * exit here.
                 */
                if (reset_state == VNIC_PROBED || reset_state == VNIC_DOWN) {
                        rc = 0;
                        goto out;
                }

                rc = ibmvnic_login(netdev);
                if (rc)
                        goto out;

                if (adapter->reset_reason == VNIC_RESET_CHANGE_PARAM) {
                        rc = init_resources(adapter);
                        if (rc)
                                goto out;
                } else if (adapter->req_rx_queues != old_num_rx_queues ||
                    adapter->req_tx_queues != old_num_tx_queues ||
                    adapter->req_rx_add_entries_per_subcrq !=
                    old_num_rx_slots ||
                    adapter->req_tx_entries_per_subcrq !=
                    old_num_tx_slots ||
                    !adapter->rx_pool ||
                    !adapter->tso_pool ||
                    !adapter->tx_pool) {
                        release_napi(adapter);
                        release_vpd_data(adapter);

                        rc = init_resources(adapter);
                        if (rc)
                                goto out;

                } else {
                        rc = init_tx_pools(netdev);
                        if (rc) {
                                netdev_dbg(netdev,
                                           "init tx pools failed (%d)\n",
                                           rc);
                                goto out;
                        }

                        rc = init_rx_pools(netdev);
                        if (rc) {
                                netdev_dbg(netdev,
                                           "init rx pools failed (%d)\n",
                                           rc);
                                goto out;
                        }
                }
                ibmvnic_disable_irqs(adapter);
        }
        adapter->state = VNIC_CLOSED;

        if (reset_state == VNIC_CLOSED) {
                rc = 0;
                goto out;
        }

        rc = __ibmvnic_open(netdev);
        if (rc) {
                rc = IBMVNIC_OPEN_FAILED;
                goto out;
        }

        /* refresh device's multicast list */
        ibmvnic_set_multi(netdev);

        if (adapter->reset_reason == VNIC_RESET_FAILOVER ||
            adapter->reset_reason == VNIC_RESET_MOBILITY)
                __netdev_notify_peers(netdev);

        rc = 0;

out:
        /* restore the adapter state if reset failed */
        if (rc)
                adapter->state = reset_state;
        /* requestor of VNIC_RESET_CHANGE_PARAM should still hold the rtnl lock */
        if (!(adapter->reset_reason == VNIC_RESET_CHANGE_PARAM))
                rtnl_unlock();

        netdev_dbg(adapter->netdev, "[S:%s FOP:%d] Reset done, rc %d\n",
                   adapter_state_to_string(adapter->state),
                   adapter->failover_pending, rc);
        return rc;
}

static int do_hard_reset(struct ibmvnic_adapter *adapter,
                         struct ibmvnic_rwi *rwi, u32 reset_state)
{
        struct net_device *netdev = adapter->netdev;
        int rc;

        netdev_dbg(adapter->netdev, "Hard resetting driver (%s)\n",
                   reset_reason_to_string(rwi->reset_reason));

        /* read the state and check (again) after getting rtnl */
        reset_state = adapter->state;

        if (reset_state == VNIC_REMOVING || reset_state == VNIC_REMOVED) {
                rc = -EBUSY;
                goto out;
        }

        netif_carrier_off(netdev);
        adapter->reset_reason = rwi->reset_reason;

        ibmvnic_cleanup(netdev);
        release_resources(adapter);
        release_sub_crqs(adapter, 0);
        release_crq_queue(adapter);

        /* remove the closed state so when we call open it appears
         * we are coming from the probed state.
         */
        adapter->state = VNIC_PROBED;

        reinit_init_done(adapter);

        rc = init_crq_queue(adapter);
        if (rc) {
                netdev_err(adapter->netdev,
                           "Couldn't initialize crq. rc=%d\n", rc);
                goto out;
        }

        rc = ibmvnic_reset_init(adapter, false);
        if (rc)
                goto out;

        /* If the adapter was in PROBE or DOWN state prior to the reset,
         * exit here.
         */
        if (reset_state == VNIC_PROBED || reset_state == VNIC_DOWN)
                goto out;

        rc = ibmvnic_login(netdev);
        if (rc)
                goto out;

        rc = init_resources(adapter);
        if (rc)
                goto out;

        ibmvnic_disable_irqs(adapter);
        adapter->state = VNIC_CLOSED;

        if (reset_state == VNIC_CLOSED)
                goto out;

        rc = __ibmvnic_open(netdev);
        if (rc) {
                rc = IBMVNIC_OPEN_FAILED;
                goto out;
        }

        __netdev_notify_peers(netdev);
out:
        /* restore adapter state if reset failed */
        if (rc)
                adapter->state = reset_state;
        netdev_dbg(adapter->netdev, "[S:%s FOP:%d] Hard reset done, rc %d\n",
                   adapter_state_to_string(adapter->state),
                   adapter->failover_pending, rc);
        return rc;
}

static struct ibmvnic_rwi *get_next_rwi(struct ibmvnic_adapter *adapter)
{
        struct ibmvnic_rwi *rwi;
        unsigned long flags;

        spin_lock_irqsave(&adapter->rwi_lock, flags);

        if (!list_empty(&adapter->rwi_list)) {
                rwi = list_first_entry(&adapter->rwi_list, struct ibmvnic_rwi,
                                       list);
                list_del(&rwi->list);
        } else {
                rwi = NULL;
        }

        spin_unlock_irqrestore(&adapter->rwi_lock, flags);
        return rwi;
}

/**
 * do_passive_init - complete probing when partner device is detected.
 * @adapter: ibmvnic_adapter struct
 *
 * If the ibmvnic device does not have a partner device to communicate with at boot
 * and that partner device comes online at a later time, this function is called
 * to complete the initialization process of ibmvnic device.
 * Caller is expected to hold rtnl_lock().
 *
 * Returns non-zero if sub-CRQs are not initialized properly leaving the device
 * in the down state.
 * Returns 0 upon success and the device is in PROBED state.
 */

static int do_passive_init(struct ibmvnic_adapter *adapter)
{
        unsigned long timeout = msecs_to_jiffies(30000);
        struct net_device *netdev = adapter->netdev;
        struct device *dev = &adapter->vdev->dev;
        int rc;

        netdev_dbg(netdev, "Partner device found, probing.\n");

        adapter->state = VNIC_PROBING;
        reinit_completion(&adapter->init_done);
        adapter->init_done_rc = 0;
        adapter->crq.active = true;

        rc = send_crq_init_complete(adapter);
        if (rc)
                goto out;

        rc = send_version_xchg(adapter);
        if (rc)
                netdev_dbg(adapter->netdev, "send_version_xchg failed, rc=%d\n", rc);

        if (!wait_for_completion_timeout(&adapter->init_done, timeout)) {
                dev_err(dev, "Initialization sequence timed out\n");
                rc = -ETIMEDOUT;
                goto out;
        }

        rc = init_sub_crqs(adapter);
        if (rc) {
                dev_err(dev, "Initialization of sub crqs failed, rc=%d\n", rc);
                goto out;
        }

        rc = init_sub_crq_irqs(adapter);
        if (rc) {
                dev_err(dev, "Failed to initialize sub crq irqs\n, rc=%d", rc);
                goto init_failed;
        }

        netdev->mtu = adapter->req_mtu - ETH_HLEN;
        netdev->min_mtu = adapter->min_mtu - ETH_HLEN;
        netdev->max_mtu = adapter->max_mtu - ETH_HLEN;

        adapter->state = VNIC_PROBED;
        netdev_dbg(netdev, "Probed successfully. Waiting for signal from partner device.\n");

        return 0;

init_failed:
        release_sub_crqs(adapter, 1);
out:
        adapter->state = VNIC_DOWN;
        return rc;
}

static void __ibmvnic_reset(struct work_struct *work)
{
        struct ibmvnic_adapter *adapter;
        unsigned int timeout = 5000;
        struct ibmvnic_rwi *tmprwi;
        bool saved_state = false;
        struct ibmvnic_rwi *rwi;
        unsigned long flags;
        struct device *dev;
        bool need_reset;
        int num_fails = 0;
        u32 reset_state;
        int rc = 0;

        adapter = container_of(work, struct ibmvnic_adapter, ibmvnic_reset);
                dev = &adapter->vdev->dev;

        /* Wait for ibmvnic_probe() to complete. If probe is taking too long
         * or if another reset is in progress, defer work for now. If probe
         * eventually fails it will flush and terminate our work.
         *
         * Three possibilities here:
         * 1. Adpater being removed  - just return
         * 2. Timed out on probe or another reset in progress - delay the work
         * 3. Completed probe - perform any resets in queue
         */
        if (adapter->state == VNIC_PROBING &&
            !wait_for_completion_timeout(&adapter->probe_done, timeout)) {
                dev_err(dev, "Reset thread timed out on probe");
                queue_delayed_work(system_long_wq,
                                   &adapter->ibmvnic_delayed_reset,
                                   IBMVNIC_RESET_DELAY);
                return;
        }

        /* adapter is done with probe (i.e state is never VNIC_PROBING now) */
        if (adapter->state == VNIC_REMOVING)
                return;

        /* ->rwi_list is stable now (no one else is removing entries) */

        /* ibmvnic_probe() may have purged the reset queue after we were
         * scheduled to process a reset so there maybe no resets to process.
         * Before setting the ->resetting bit though, we have to make sure
         * that there is infact a reset to process. Otherwise we may race
         * with ibmvnic_open() and end up leaving the vnic down:
         *
         *      __ibmvnic_reset()           ibmvnic_open()
         *      -----------------           --------------
         *
         *  set ->resetting bit
         *                              find ->resetting bit is set
         *                              set ->state to IBMVNIC_OPEN (i.e
         *                              assume reset will open device)
         *                              return
         *  find reset queue empty
         *  return
         *
         *      Neither performed vnic login/open and vnic stays down
         *
         * If we hold the lock and conditionally set the bit, either we
         * or ibmvnic_open() will complete the open.
         */
        need_reset = false;
        spin_lock(&adapter->rwi_lock);
        if (!list_empty(&adapter->rwi_list)) {
                if (test_and_set_bit_lock(0, &adapter->resetting)) {
                        queue_delayed_work(system_long_wq,
                                           &adapter->ibmvnic_delayed_reset,
                                           IBMVNIC_RESET_DELAY);
                } else {
                        need_reset = true;
                }
        }
        spin_unlock(&adapter->rwi_lock);

        if (!need_reset)
                return;

        rwi = get_next_rwi(adapter);
        while (rwi) {
                spin_lock_irqsave(&adapter->state_lock, flags);

                if (adapter->state == VNIC_REMOVING ||
                    adapter->state == VNIC_REMOVED) {
                        spin_unlock_irqrestore(&adapter->state_lock, flags);
                        kfree(rwi);
                        rc = EBUSY;
                        break;
                }

                if (!saved_state) {
                        reset_state = adapter->state;
                        saved_state = true;
                }
                spin_unlock_irqrestore(&adapter->state_lock, flags);

                if (rwi->reset_reason == VNIC_RESET_PASSIVE_INIT) {
                        rtnl_lock();
                        rc = do_passive_init(adapter);
                        rtnl_unlock();
                        if (!rc)
                                netif_carrier_on(adapter->netdev);
                } else if (adapter->force_reset_recovery) {
                        /* Since we are doing a hard reset now, clear the
                         * failover_pending flag so we don't ignore any
                         * future MOBILITY or other resets.
                         */
                        adapter->failover_pending = false;

                        /* Transport event occurred during previous reset */
                        if (adapter->wait_for_reset) {
                                /* Previous was CHANGE_PARAM; caller locked */
                                adapter->force_reset_recovery = false;
                                rc = do_hard_reset(adapter, rwi, reset_state);
                        } else {
                                rtnl_lock();
                                adapter->force_reset_recovery = false;
                                rc = do_hard_reset(adapter, rwi, reset_state);
                                rtnl_unlock();
                        }
                        if (rc)
                                num_fails++;
                        else
                                num_fails = 0;

                        /* If auto-priority-failover is enabled we can get
                         * back to back failovers during resets, resulting
                         * in at least two failed resets (from high-priority
                         * backing device to low-priority one and then back)
                         * If resets continue to fail beyond that, give the
                         * adapter some time to settle down before retrying.
                         */
                        if (num_fails >= 3) {
                                netdev_dbg(adapter->netdev,
                                           "[S:%s] Hard reset failed %d times, waiting 60 secs\n",
                                           adapter_state_to_string(adapter->state),
                                           num_fails);
                                set_current_state(TASK_UNINTERRUPTIBLE);
                                schedule_timeout(60 * HZ);
                        }
                } else {
                        rc = do_reset(adapter, rwi, reset_state);
                }
                tmprwi = rwi;
                adapter->last_reset_time = jiffies;

                if (rc)
                        netdev_dbg(adapter->netdev, "Reset failed, rc=%d\n", rc);

                rwi = get_next_rwi(adapter);

                /*
                 * If there are no resets queued and the previous reset failed,
                 * the adapter would be in an undefined state. So retry the
                 * previous reset as a hard reset.
                 *
                 * Else, free the previous rwi and, if there is another reset
                 * queued, process the new reset even if previous reset failed
                 * (the previous reset could have failed because of a fail
                 * over for instance, so process the fail over).
                 */
                if (!rwi && rc)
                        rwi = tmprwi;
                else
                        kfree(tmprwi);

                if (rwi && (rwi->reset_reason == VNIC_RESET_FAILOVER ||
                            rwi->reset_reason == VNIC_RESET_MOBILITY || rc))
                        adapter->force_reset_recovery = true;
        }

        if (adapter->wait_for_reset) {
                adapter->reset_done_rc = rc;
                complete(&adapter->reset_done);
        }

        clear_bit_unlock(0, &adapter->resetting);

        netdev_dbg(adapter->netdev,
                   "[S:%s FRR:%d WFR:%d] Done processing resets\n",
                   adapter_state_to_string(adapter->state),
                   adapter->force_reset_recovery,
                   adapter->wait_for_reset);
}

static void __ibmvnic_delayed_reset(struct work_struct *work)
{
        struct ibmvnic_adapter *adapter;

        adapter = container_of(work, struct ibmvnic_adapter,
                               ibmvnic_delayed_reset.work);
        __ibmvnic_reset(&adapter->ibmvnic_reset);
}

static void flush_reset_queue(struct ibmvnic_adapter *adapter)
{
        struct list_head *entry, *tmp_entry;

        if (!list_empty(&adapter->rwi_list)) {
                list_for_each_safe(entry, tmp_entry, &adapter->rwi_list) {
                        list_del(entry);
                        kfree(list_entry(entry, struct ibmvnic_rwi, list));
                }
        }
}

static int ibmvnic_reset(struct ibmvnic_adapter *adapter,
                         enum ibmvnic_reset_reason reason)
{
        struct net_device *netdev = adapter->netdev;
        struct ibmvnic_rwi *rwi, *tmp;
        unsigned long flags;
        int ret;

        spin_lock_irqsave(&adapter->rwi_lock, flags);

        /* If failover is pending don't schedule any other reset.
         * Instead let the failover complete. If there is already a
         * a failover reset scheduled, we will detect and drop the
         * duplicate reset when walking the ->rwi_list below.
         */
        if (adapter->state == VNIC_REMOVING ||
            adapter->state == VNIC_REMOVED ||
            (adapter->failover_pending && reason != VNIC_RESET_FAILOVER)) {
                ret = EBUSY;
                netdev_dbg(netdev, "Adapter removing or pending failover, skipping reset\n");
                goto err;
        }

        list_for_each_entry(tmp, &adapter->rwi_list, list) {
                if (tmp->reset_reason == reason) {
                        netdev_dbg(netdev, "Skipping matching reset, reason=%s\n",
                                   reset_reason_to_string(reason));
                        ret = EBUSY;
                        goto err;
                }
        }

        rwi = kzalloc(sizeof(*rwi), GFP_ATOMIC);
        if (!rwi) {
                ret = ENOMEM;
                goto err;
        }
        /* if we just received a transport event,
         * flush reset queue and process this reset
         */
        if (adapter->force_reset_recovery)
                flush_reset_queue(adapter);

        rwi->reset_reason = reason;
        list_add_tail(&rwi->list, &adapter->rwi_list);
        netdev_dbg(adapter->netdev, "Scheduling reset (reason %s)\n",
                   reset_reason_to_string(reason));
        queue_work(system_long_wq, &adapter->ibmvnic_reset);

        ret = 0;
err:
        /* ibmvnic_close() below can block, so drop the lock first */
        spin_unlock_irqrestore(&adapter->rwi_lock, flags);

        if (ret == ENOMEM)
                ibmvnic_close(netdev);

        return -ret;
}

static void ibmvnic_tx_timeout(struct net_device *dev, unsigned int txqueue)
{
        struct ibmvnic_adapter *adapter = netdev_priv(dev);

        if (test_bit(0, &adapter->resetting)) {
                netdev_err(adapter->netdev,
                           "Adapter is resetting, skip timeout reset\n");
                return;
        }
        /* No queuing up reset until at least 5 seconds (default watchdog val)
         * after last reset
         */
        if (time_before(jiffies, (adapter->last_reset_time + dev->watchdog_timeo))) {
                netdev_dbg(dev, "Not yet time to tx timeout.\n");
                return;
        }
        ibmvnic_reset(adapter, VNIC_RESET_TIMEOUT);
}

static void remove_buff_from_pool(struct ibmvnic_adapter *adapter,
                                  struct ibmvnic_rx_buff *rx_buff)
{
        struct ibmvnic_rx_pool *pool = &adapter->rx_pool[rx_buff->pool_index];

        rx_buff->skb = NULL;

        pool->free_map[pool->next_alloc] = (int)(rx_buff - pool->rx_buff);
        pool->next_alloc = (pool->next_alloc + 1) % pool->size;

        atomic_dec(&pool->available);
}

static int ibmvnic_poll(struct napi_struct *napi, int budget)
{
        struct ibmvnic_sub_crq_queue *rx_scrq;
        struct ibmvnic_adapter *adapter;
        struct net_device *netdev;
        int frames_processed;
        int scrq_num;

        netdev = napi->dev;
        adapter = netdev_priv(netdev);
        scrq_num = (int)(napi - adapter->napi);
        frames_processed = 0;
        rx_scrq = adapter->rx_scrq[scrq_num];

restart_poll:
        while (frames_processed < budget) {
                struct sk_buff *skb;
                struct ibmvnic_rx_buff *rx_buff;
                union sub_crq *next;
                u32 length;
                u16 offset;
                u8 flags = 0;

                if (unlikely(test_bit(0, &adapter->resetting) &&
                             adapter->reset_reason != VNIC_RESET_NON_FATAL)) {
                        enable_scrq_irq(adapter, rx_scrq);
                        napi_complete_done(napi, frames_processed);
                        return frames_processed;
                }

                if (!pending_scrq(adapter, rx_scrq))
                        break;
                next = ibmvnic_next_scrq(adapter, rx_scrq);
                rx_buff = (struct ibmvnic_rx_buff *)
                          be64_to_cpu(next->rx_comp.correlator);
                /* do error checking */
                if (next->rx_comp.rc) {
                        netdev_dbg(netdev, "rx buffer returned with rc %x\n",
                                   be16_to_cpu(next->rx_comp.rc));
                        /* free the entry */
                        next->rx_comp.first = 0;
                        dev_kfree_skb_any(rx_buff->skb);
                        remove_buff_from_pool(adapter, rx_buff);
                        continue;
                } else if (!rx_buff->skb) {
                        /* free the entry */
                        next->rx_comp.first = 0;
                        remove_buff_from_pool(adapter, rx_buff);
                        continue;
                }

                length = be32_to_cpu(next->rx_comp.len);
                offset = be16_to_cpu(next->rx_comp.off_frame_data);
                flags = next->rx_comp.flags;
                skb = rx_buff->skb;
                /* load long_term_buff before copying to skb */
                dma_rmb();
                skb_copy_to_linear_data(skb, rx_buff->data + offset,
                                        length);

                /* VLAN Header has been stripped by the system firmware and
                 * needs to be inserted by the driver
                 */
                if (adapter->rx_vlan_header_insertion &&
                    (flags & IBMVNIC_VLAN_STRIPPED))
                        __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
                                               ntohs(next->rx_comp.vlan_tci));

                /* free the entry */
                next->rx_comp.first = 0;
                remove_buff_from_pool(adapter, rx_buff);

                skb_put(skb, length);
                skb->protocol = eth_type_trans(skb, netdev);
                skb_record_rx_queue(skb, scrq_num);

                if (flags & IBMVNIC_IP_CHKSUM_GOOD &&
                    flags & IBMVNIC_TCP_UDP_CHKSUM_GOOD) {
                        skb->ip_summed = CHECKSUM_UNNECESSARY;
                }

                length = skb->len;
                napi_gro_receive(napi, skb); /* send it up */
                netdev->stats.rx_packets++;
                netdev->stats.rx_bytes += length;
                adapter->rx_stats_buffers[scrq_num].packets++;
                adapter->rx_stats_buffers[scrq_num].bytes += length;
                frames_processed++;
        }

        if (adapter->state != VNIC_CLOSING &&
            (atomic_read(&adapter->rx_pool[scrq_num].available) <
              adapter->req_rx_add_entries_per_subcrq / 2))
                replenish_rx_pool(adapter, &adapter->rx_pool[scrq_num]);
        if (frames_processed < budget) {
                if (napi_complete_done(napi, frames_processed)) {
                        enable_scrq_irq(adapter, rx_scrq);
                        if (pending_scrq(adapter, rx_scrq)) {
                                if (napi_schedule(napi)) {
                                        disable_scrq_irq(adapter, rx_scrq);
                                        goto restart_poll;
                                }
                        }
                }
        }
        return frames_processed;
}

static int wait_for_reset(struct ibmvnic_adapter *adapter)
{
        int rc, ret;

        adapter->fallback.mtu = adapter->req_mtu;
        adapter->fallback.rx_queues = adapter->req_rx_queues;
        adapter->fallback.tx_queues = adapter->req_tx_queues;
        adapter->fallback.rx_entries = adapter->req_rx_add_entries_per_subcrq;
        adapter->fallback.tx_entries = adapter->req_tx_entries_per_subcrq;

        reinit_completion(&adapter->reset_done);
        adapter->wait_for_reset = true;
        rc = ibmvnic_reset(adapter, VNIC_RESET_CHANGE_PARAM);

        if (rc) {
                ret = rc;
                goto out;
        }
        rc = ibmvnic_wait_for_completion(adapter, &adapter->reset_done, 60000);
        if (rc) {
                ret = -ENODEV;
                goto out;
        }

        ret = 0;
        if (adapter->reset_done_rc) {
                ret = -EIO;
                adapter->desired.mtu = adapter->fallback.mtu;
                adapter->desired.rx_queues = adapter->fallback.rx_queues;
                adapter->desired.tx_queues = adapter->fallback.tx_queues;
                adapter->desired.rx_entries = adapter->fallback.rx_entries;
                adapter->desired.tx_entries = adapter->fallback.tx_entries;

                reinit_completion(&adapter->reset_done);
                adapter->wait_for_reset = true;
                rc = ibmvnic_reset(adapter, VNIC_RESET_CHANGE_PARAM);
                if (rc) {
                        ret = rc;
                        goto out;
                }
                rc = ibmvnic_wait_for_completion(adapter, &adapter->reset_done,
                                                 60000);
                if (rc) {
                        ret = -ENODEV;
                        goto out;
                }
        }
out:
        adapter->wait_for_reset = false;

        return ret;
}

static int ibmvnic_change_mtu(struct net_device *netdev, int new_mtu)
{
        struct ibmvnic_adapter *adapter = netdev_priv(netdev);

        adapter->desired.mtu = new_mtu + ETH_HLEN;

        return wait_for_reset(adapter);
}

static netdev_features_t ibmvnic_features_check(struct sk_buff *skb,
                                                struct net_device *dev,
                                                netdev_features_t features)
{
        /* Some backing hardware adapters can not
         * handle packets with a MSS less than 224
         * or with only one segment.
         */
        if (skb_is_gso(skb)) {
                if (skb_shinfo(skb)->gso_size < 224 ||
                    skb_shinfo(skb)->gso_segs == 1)
                        features &= ~NETIF_F_GSO_MASK;
        }

        return features;
}

static const struct net_device_ops ibmvnic_netdev_ops = {
        .ndo_open               = ibmvnic_open,
        .ndo_stop               = ibmvnic_close,
        .ndo_start_xmit         = ibmvnic_xmit,
        .ndo_set_rx_mode        = ibmvnic_set_multi,
        .ndo_set_mac_address    = ibmvnic_set_mac,
        .ndo_validate_addr      = eth_validate_addr,
        .ndo_tx_timeout         = ibmvnic_tx_timeout,
        .ndo_change_mtu         = ibmvnic_change_mtu,
        .ndo_features_check     = ibmvnic_features_check,
};

/* ethtool functions */

static int ibmvnic_get_link_ksettings(struct net_device *netdev,
                                      struct ethtool_link_ksettings *cmd)
{
        struct ibmvnic_adapter *adapter = netdev_priv(netdev);
        int rc;

        rc = send_query_phys_parms(adapter);
        if (rc) {
                adapter->speed = SPEED_UNKNOWN;
                adapter->duplex = DUPLEX_UNKNOWN;
        }
        cmd->base.speed = adapter->speed;
        cmd->base.duplex = adapter->duplex;
        cmd->base.port = PORT_FIBRE;
        cmd->base.phy_address = 0;
        cmd->base.autoneg = AUTONEG_ENABLE;

        return 0;
}

static void ibmvnic_get_drvinfo(struct net_device *netdev,
                                struct ethtool_drvinfo *info)
{
        struct ibmvnic_adapter *adapter = netdev_priv(netdev);

        strscpy(info->driver, ibmvnic_driver_name, sizeof(info->driver));
        strscpy(info->version, IBMVNIC_DRIVER_VERSION, sizeof(info->version));
        strscpy(info->fw_version, adapter->fw_version,
                sizeof(info->fw_version));
}

static u32 ibmvnic_get_msglevel(struct net_device *netdev)
{
        struct ibmvnic_adapter *adapter = netdev_priv(netdev);

        return adapter->msg_enable;
}

static void ibmvnic_set_msglevel(struct net_device *netdev, u32 data)
{
        struct ibmvnic_adapter *adapter = netdev_priv(netdev);

        adapter->msg_enable = data;
}

static u32 ibmvnic_get_link(struct net_device *netdev)
{
        struct ibmvnic_adapter *adapter = netdev_priv(netdev);

        /* Don't need to send a query because we request a logical link up at
         * init and then we wait for link state indications
         */
        return adapter->logical_link_state;
}

static void ibmvnic_get_ringparam(struct net_device *netdev,
                                  struct ethtool_ringparam *ring,
                                  struct kernel_ethtool_ringparam *kernel_ring,
                                  struct netlink_ext_ack *extack)
{
        struct ibmvnic_adapter *adapter = netdev_priv(netdev);

        ring->rx_max_pending = adapter->max_rx_add_entries_per_subcrq;
        ring->tx_max_pending = adapter->max_tx_entries_per_subcrq;
        ring->rx_mini_max_pending = 0;
        ring->rx_jumbo_max_pending = 0;
        ring->rx_pending = adapter->req_rx_add_entries_per_subcrq;
        ring->tx_pending = adapter->req_tx_entries_per_subcrq;
        ring->rx_mini_pending = 0;
        ring->rx_jumbo_pending = 0;
}

static int ibmvnic_set_ringparam(struct net_device *netdev,
                                 struct ethtool_ringparam *ring,
                                 struct kernel_ethtool_ringparam *kernel_ring,
                                 struct netlink_ext_ack *extack)
{
        struct ibmvnic_adapter *adapter = netdev_priv(netdev);

        if (ring->rx_pending > adapter->max_rx_add_entries_per_subcrq  ||
            ring->tx_pending > adapter->max_tx_entries_per_subcrq) {
                netdev_err(netdev, "Invalid request.\n");
                netdev_err(netdev, "Max tx buffers = %llu\n",
                           adapter->max_rx_add_entries_per_subcrq);
                netdev_err(netdev, "Max rx buffers = %llu\n",
                           adapter->max_tx_entries_per_subcrq);
                return -EINVAL;
        }

        adapter->desired.rx_entries = ring->rx_pending;
        adapter->desired.tx_entries = ring->tx_pending;

        return wait_for_reset(adapter);
}

static void ibmvnic_get_channels(struct net_device *netdev,
                                 struct ethtool_channels *channels)
{
        struct ibmvnic_adapter *adapter = netdev_priv(netdev);

        channels->max_rx = adapter->max_rx_queues;
        channels->max_tx = adapter->max_tx_queues;
        channels->max_other = 0;
        channels->max_combined = 0;
        channels->rx_count = adapter->req_rx_queues;
        channels->tx_count = adapter->req_tx_queues;
        channels->other_count = 0;
        channels->combined_count = 0;
}

static int ibmvnic_set_channels(struct net_device *netdev,
                                struct ethtool_channels *channels)
{
        struct ibmvnic_adapter *adapter = netdev_priv(netdev);

        adapter->desired.rx_queues = channels->rx_count;
        adapter->desired.tx_queues = channels->tx_count;

        return wait_for_reset(adapter);
}

static void ibmvnic_get_strings(struct net_device *dev, u32 stringset, u8 *data)
{
        struct ibmvnic_adapter *adapter = netdev_priv(dev);
        int i;

        if (stringset != ETH_SS_STATS)
                return;

        for (i = 0; i < ARRAY_SIZE(ibmvnic_stats); i++, data += ETH_GSTRING_LEN)
                memcpy(data, ibmvnic_stats[i].name, ETH_GSTRING_LEN);

        for (i = 0; i < adapter->req_tx_queues; i++) {
                snprintf(data, ETH_GSTRING_LEN, "tx%d_packets", i);
                data += ETH_GSTRING_LEN;

                snprintf(data, ETH_GSTRING_LEN, "tx%d_bytes", i);
                data += ETH_GSTRING_LEN;

                snprintf(data, ETH_GSTRING_LEN, "tx%d_dropped_packets", i);
                data += ETH_GSTRING_LEN;
        }

        for (i = 0; i < adapter->req_rx_queues; i++) {
                snprintf(data, ETH_GSTRING_LEN, "rx%d_packets", i);
                data += ETH_GSTRING_LEN;

                snprintf(data, ETH_GSTRING_LEN, "rx%d_bytes", i);
                data += ETH_GSTRING_LEN;

                snprintf(data, ETH_GSTRING_LEN, "rx%d_interrupts", i);
                data += ETH_GSTRING_LEN;
        }
}

static int ibmvnic_get_sset_count(struct net_device *dev, int sset)
{
        struct ibmvnic_adapter *adapter = netdev_priv(dev);

        switch (sset) {
        case ETH_SS_STATS:
                return ARRAY_SIZE(ibmvnic_stats) +
                       adapter->req_tx_queues * NUM_TX_STATS +
                       adapter->req_rx_queues * NUM_RX_STATS;
        default:
                return -EOPNOTSUPP;
        }
}

static void ibmvnic_get_ethtool_stats(struct net_device *dev,
                                      struct ethtool_stats *stats, u64 *data)
{
        struct ibmvnic_adapter *adapter = netdev_priv(dev);
        union ibmvnic_crq crq;
        int i, j;
        int rc;

        memset(&crq, 0, sizeof(crq));
        crq.request_statistics.first = IBMVNIC_CRQ_CMD;
        crq.request_statistics.cmd = REQUEST_STATISTICS;
        crq.request_statistics.ioba = cpu_to_be32(adapter->stats_token);
        crq.request_statistics.len =
            cpu_to_be32(sizeof(struct ibmvnic_statistics));

        /* Wait for data to be written */
        reinit_completion(&adapter->stats_done);
        rc = ibmvnic_send_crq(adapter, &crq);
        if (rc)
                return;
        rc = ibmvnic_wait_for_completion(adapter, &adapter->stats_done, 10000);
        if (rc)
                return;

        for (i = 0; i < ARRAY_SIZE(ibmvnic_stats); i++)
                data[i] = be64_to_cpu(IBMVNIC_GET_STAT
                                      (adapter, ibmvnic_stats[i].offset));

        for (j = 0; j < adapter->req_tx_queues; j++) {
                data[i] = adapter->tx_stats_buffers[j].packets;
                i++;
                data[i] = adapter->tx_stats_buffers[j].bytes;
                i++;
                data[i] = adapter->tx_stats_buffers[j].dropped_packets;
                i++;
        }

        for (j = 0; j < adapter->req_rx_queues; j++) {
                data[i] = adapter->rx_stats_buffers[j].packets;
                i++;
                data[i] = adapter->rx_stats_buffers[j].bytes;
                i++;
                data[i] = adapter->rx_stats_buffers[j].interrupts;
                i++;
        }
}

static const struct ethtool_ops ibmvnic_ethtool_ops = {
        .get_drvinfo            = ibmvnic_get_drvinfo,
        .get_msglevel           = ibmvnic_get_msglevel,
        .set_msglevel           = ibmvnic_set_msglevel,
        .get_link               = ibmvnic_get_link,
        .get_ringparam          = ibmvnic_get_ringparam,
        .set_ringparam          = ibmvnic_set_ringparam,
        .get_channels           = ibmvnic_get_channels,
        .set_channels           = ibmvnic_set_channels,
        .get_strings            = ibmvnic_get_strings,
        .get_sset_count         = ibmvnic_get_sset_count,
        .get_ethtool_stats      = ibmvnic_get_ethtool_stats,
        .get_link_ksettings     = ibmvnic_get_link_ksettings,
};

/* Routines for managing CRQs/sCRQs  */

static int reset_one_sub_crq_queue(struct ibmvnic_adapter *adapter,
                                   struct ibmvnic_sub_crq_queue *scrq)
{
        int rc;

        if (!scrq) {
                netdev_dbg(adapter->netdev, "Invalid scrq reset.\n");
                return -EINVAL;
        }

        if (scrq->irq) {
                free_irq(scrq->irq, scrq);
                irq_dispose_mapping(scrq->irq);
                scrq->irq = 0;
        }

        if (scrq->msgs) {
                memset(scrq->msgs, 0, 4 * PAGE_SIZE);
                atomic_set(&scrq->used, 0);
                scrq->cur = 0;
                scrq->ind_buf.index = 0;
        } else {
                netdev_dbg(adapter->netdev, "Invalid scrq reset\n");
                return -EINVAL;
        }

        rc = h_reg_sub_crq(adapter->vdev->unit_address, scrq->msg_token,
                           4 * PAGE_SIZE, &scrq->crq_num, &scrq->hw_irq);
        return rc;
}

static int reset_sub_crq_queues(struct ibmvnic_adapter *adapter)
{
        int i, rc;

        if (!adapter->tx_scrq || !adapter->rx_scrq)
                return -EINVAL;

        ibmvnic_clean_affinity(adapter);

        for (i = 0; i < adapter->req_tx_queues; i++) {
                netdev_dbg(adapter->netdev, "Re-setting tx_scrq[%d]\n", i);
                rc = reset_one_sub_crq_queue(adapter, adapter->tx_scrq[i]);
                if (rc)
                        return rc;
        }

        for (i = 0; i < adapter->req_rx_queues; i++) {
                netdev_dbg(adapter->netdev, "Re-setting rx_scrq[%d]\n", i);
                rc = reset_one_sub_crq_queue(adapter, adapter->rx_scrq[i]);
                if (rc)
                        return rc;
        }

        return rc;
}

static void release_sub_crq_queue(struct ibmvnic_adapter *adapter,
                                  struct ibmvnic_sub_crq_queue *scrq,
                                  bool do_h_free)
{
        struct device *dev = &adapter->vdev->dev;
        long rc;

        netdev_dbg(adapter->netdev, "Releasing sub-CRQ\n");

        if (do_h_free) {
                /* Close the sub-crqs */
                do {
                        rc = plpar_hcall_norets(H_FREE_SUB_CRQ,
                                                adapter->vdev->unit_address,
                                                scrq->crq_num);
                } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));

                if (rc) {
                        netdev_err(adapter->netdev,
                                   "Failed to release sub-CRQ %16lx, rc = %ld\n",
                                   scrq->crq_num, rc);
                }
        }

        dma_free_coherent(dev,
                          IBMVNIC_IND_ARR_SZ,
                          scrq->ind_buf.indir_arr,
                          scrq->ind_buf.indir_dma);

        dma_unmap_single(dev, scrq->msg_token, 4 * PAGE_SIZE,
                         DMA_BIDIRECTIONAL);
        free_pages((unsigned long)scrq->msgs, 2);
        free_cpumask_var(scrq->affinity_mask);
        kfree(scrq);
}

static struct ibmvnic_sub_crq_queue *init_sub_crq_queue(struct ibmvnic_adapter
                                                        *adapter)
{
        struct device *dev = &adapter->vdev->dev;
        struct ibmvnic_sub_crq_queue *scrq;
        int rc;

        scrq = kzalloc(sizeof(*scrq), GFP_KERNEL);
        if (!scrq)
                return NULL;

        scrq->msgs =
                (union sub_crq *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, 2);
        if (!scrq->msgs) {
                dev_warn(dev, "Couldn't allocate crq queue messages page\n");
                goto zero_page_failed;
        }
        if (!zalloc_cpumask_var(&scrq->affinity_mask, GFP_KERNEL))
                goto cpumask_alloc_failed;

        scrq->msg_token = dma_map_single(dev, scrq->msgs, 4 * PAGE_SIZE,
                                         DMA_BIDIRECTIONAL);
        if (dma_mapping_error(dev, scrq->msg_token)) {
                dev_warn(dev, "Couldn't map crq queue messages page\n");
                goto map_failed;
        }

        rc = h_reg_sub_crq(adapter->vdev->unit_address, scrq->msg_token,
                           4 * PAGE_SIZE, &scrq->crq_num, &scrq->hw_irq);

        if (rc == H_RESOURCE)
                rc = ibmvnic_reset_crq(adapter);

        if (rc == H_CLOSED) {
                dev_warn(dev, "Partner adapter not ready, waiting.\n");
        } else if (rc) {
                dev_warn(dev, "Error %d registering sub-crq\n", rc);
                goto reg_failed;
        }

        scrq->adapter = adapter;
        scrq->size = 4 * PAGE_SIZE / sizeof(*scrq->msgs);
        scrq->ind_buf.index = 0;

        scrq->ind_buf.indir_arr =
                dma_alloc_coherent(dev,
                                   IBMVNIC_IND_ARR_SZ,
                                   &scrq->ind_buf.indir_dma,
                                   GFP_KERNEL);

        if (!scrq->ind_buf.indir_arr)
                goto indir_failed;

        spin_lock_init(&scrq->lock);

        netdev_dbg(adapter->netdev,
                   "sub-crq initialized, num %lx, hw_irq=%lx, irq=%x\n",
                   scrq->crq_num, scrq->hw_irq, scrq->irq);

        return scrq;

indir_failed:
        do {
                rc = plpar_hcall_norets(H_FREE_SUB_CRQ,
                                        adapter->vdev->unit_address,
                                        scrq->crq_num);
        } while (rc == H_BUSY || rc == H_IS_LONG_BUSY(rc));
reg_failed:
        dma_unmap_single(dev, scrq->msg_token, 4 * PAGE_SIZE,
                         DMA_BIDIRECTIONAL);
map_failed:
        free_cpumask_var(scrq->affinity_mask);
cpumask_alloc_failed:
        free_pages((unsigned long)scrq->msgs, 2);
zero_page_failed:
        kfree(scrq);

        return NULL;
}

static void release_sub_crqs(struct ibmvnic_adapter *adapter, bool do_h_free)
{
        int i;

        ibmvnic_clean_affinity(adapter);
        if (adapter->tx_scrq) {
                for (i = 0; i < adapter->num_active_tx_scrqs; i++) {
                        if (!adapter->tx_scrq[i])
                                continue;

                        netdev_dbg(adapter->netdev, "Releasing tx_scrq[%d]\n",
                                   i);
                        ibmvnic_tx_scrq_clean_buffer(adapter, adapter->tx_scrq[i]);
                        if (adapter->tx_scrq[i]->irq) {
                                free_irq(adapter->tx_scrq[i]->irq,
                                         adapter->tx_scrq[i]);
                                irq_dispose_mapping(adapter->tx_scrq[i]->irq);
                                adapter->tx_scrq[i]->irq = 0;
                        }

                        release_sub_crq_queue(adapter, adapter->tx_scrq[i],
                                              do_h_free);
                }

                kfree(adapter->tx_scrq);
                adapter->tx_scrq = NULL;
                adapter->num_active_tx_scrqs = 0;
        }

        /* Clean any remaining outstanding SKBs
         * we freed the irq so we won't be hearing
         * from them
         */
        clean_tx_pools(adapter);

        if (adapter->rx_scrq) {
                for (i = 0; i < adapter->num_active_rx_scrqs; i++) {
                        if (!adapter->rx_scrq[i])
                                continue;

                        netdev_dbg(adapter->netdev, "Releasing rx_scrq[%d]\n",
                                   i);
                        if (adapter->rx_scrq[i]->irq) {
                                free_irq(adapter->rx_scrq[i]->irq,
                                         adapter->rx_scrq[i]);
                                irq_dispose_mapping(adapter->rx_scrq[i]->irq);
                                adapter->rx_scrq[i]->irq = 0;
                        }

                        release_sub_crq_queue(adapter, adapter->rx_scrq[i],
                                              do_h_free);
                }

                kfree(adapter->rx_scrq);
                adapter->rx_scrq = NULL;
                adapter->num_active_rx_scrqs = 0;
        }
}

static int disable_scrq_irq(struct ibmvnic_adapter *adapter,
                            struct ibmvnic_sub_crq_queue *scrq)
{
        struct device *dev = &adapter->vdev->dev;
        unsigned long rc;

        rc = plpar_hcall_norets(H_VIOCTL, adapter->vdev->unit_address,
                                H_DISABLE_VIO_INTERRUPT, scrq->hw_irq, 0, 0);
        if (rc)
                dev_err(dev, "Couldn't disable scrq irq 0x%lx. rc=%ld\n",
                        scrq->hw_irq, rc);
        return rc;
}

/* We can not use the IRQ chip EOI handler because that has the
 * unintended effect of changing the interrupt priority.
 */
static void ibmvnic_xics_eoi(struct device *dev, struct ibmvnic_sub_crq_queue *scrq)
{
        u64 val = 0xff000000 | scrq->hw_irq;
        unsigned long rc;

        rc = plpar_hcall_norets(H_EOI, val);
        if (rc)
                dev_err(dev, "H_EOI FAILED irq 0x%llx. rc=%ld\n", val, rc);
}

/* Due to a firmware bug, the hypervisor can send an interrupt to a
 * transmit or receive queue just prior to a partition migration.
 * Force an EOI after migration.
 */
static void ibmvnic_clear_pending_interrupt(struct device *dev,
                                            struct ibmvnic_sub_crq_queue *scrq)
{
        if (!xive_enabled())
                ibmvnic_xics_eoi(dev, scrq);
}

static int enable_scrq_irq(struct ibmvnic_adapter *adapter,
                           struct ibmvnic_sub_crq_queue *scrq)
{
        struct device *dev = &adapter->vdev->dev;
        unsigned long rc;

        if (scrq->hw_irq > 0x100000000ULL) {
                dev_err(dev, "bad hw_irq = %lx\n", scrq->hw_irq);
                return 1;
        }

        if (test_bit(0, &adapter->resetting) &&
            adapter->reset_reason == VNIC_RESET_MOBILITY) {
                ibmvnic_clear_pending_interrupt(dev, scrq);
        }

        rc = plpar_hcall_norets(H_VIOCTL, adapter->vdev->unit_address,
                                H_ENABLE_VIO_INTERRUPT, scrq->hw_irq, 0, 0);
        if (rc)
                dev_err(dev, "Couldn't enable scrq irq 0x%lx. rc=%ld\n",
                        scrq->hw_irq, rc);
        return rc;
}

static int ibmvnic_complete_tx(struct ibmvnic_adapter *adapter,
                               struct ibmvnic_sub_crq_queue *scrq)
{
        struct device *dev = &adapter->vdev->dev;
        int num_packets = 0, total_bytes = 0;
        struct ibmvnic_tx_pool *tx_pool;
        struct ibmvnic_tx_buff *txbuff;
        struct netdev_queue *txq;
        union sub_crq *next;
        int index, i;

restart_loop:
        while (pending_scrq(adapter, scrq)) {
                unsigned int pool = scrq->pool_index;
                int num_entries = 0;
                next = ibmvnic_next_scrq(adapter, scrq);
                for (i = 0; i < next->tx_comp.num_comps; i++) {
                        index = be32_to_cpu(next->tx_comp.correlators[i]);
                        if (index & IBMVNIC_TSO_POOL_MASK) {
                                tx_pool = &adapter->tso_pool[pool];
                                index &= ~IBMVNIC_TSO_POOL_MASK;
                        } else {
                                tx_pool = &adapter->tx_pool[pool];
                        }

                        txbuff = &tx_pool->tx_buff[index];
                        num_packets++;
                        num_entries += txbuff->num_entries;
                        if (txbuff->skb) {
                                total_bytes += txbuff->skb->len;
                                if (next->tx_comp.rcs[i]) {
                                        dev_err(dev, "tx error %x\n",
                                                next->tx_comp.rcs[i]);
                                        dev_kfree_skb_irq(txbuff->skb);
                                } else {
                                        dev_consume_skb_irq(txbuff->skb);
                                }
                                txbuff->skb = NULL;
                        } else {
                                netdev_warn(adapter->netdev,
                                            "TX completion received with NULL socket buffer\n");
                        }
                        tx_pool->free_map[tx_pool->producer_index] = index;
                        tx_pool->producer_index =
                                (tx_pool->producer_index + 1) %
                                        tx_pool->num_buffers;
                }
                /* remove tx_comp scrq*/
                next->tx_comp.first = 0;


                if (atomic_sub_return(num_entries, &scrq->used) <=
                    (adapter->req_tx_entries_per_subcrq / 2) &&
                    __netif_subqueue_stopped(adapter->netdev,
                                             scrq->pool_index)) {
                        rcu_read_lock();
                        if (adapter->tx_queues_active) {
                                netif_wake_subqueue(adapter->netdev,
                                                    scrq->pool_index);
                                netdev_dbg(adapter->netdev,
                                           "Started queue %d\n",
                                           scrq->pool_index);
                        }
                        rcu_read_unlock();
                }
        }

        enable_scrq_irq(adapter, scrq);

        if (pending_scrq(adapter, scrq)) {
                disable_scrq_irq(adapter, scrq);
                goto restart_loop;
        }

        txq = netdev_get_tx_queue(adapter->netdev, scrq->pool_index);
        netdev_tx_completed_queue(txq, num_packets, total_bytes);

        return 0;
}

static irqreturn_t ibmvnic_interrupt_tx(int irq, void *instance)
{
        struct ibmvnic_sub_crq_queue *scrq = instance;
        struct ibmvnic_adapter *adapter = scrq->adapter;

        disable_scrq_irq(adapter, scrq);
        ibmvnic_complete_tx(adapter, scrq);

        return IRQ_HANDLED;
}

static irqreturn_t ibmvnic_interrupt_rx(int irq, void *instance)
{
        struct ibmvnic_sub_crq_queue *scrq = instance;
        struct ibmvnic_adapter *adapter = scrq->adapter;

        /* When booting a kdump kernel we can hit pending interrupts
         * prior to completing driver initialization.
         */
        if (unlikely(adapter->state != VNIC_OPEN))
                return IRQ_NONE;

        adapter->rx_stats_buffers[scrq->scrq_num].interrupts++;

        if (napi_schedule_prep(&adapter->napi[scrq->scrq_num])) {
                disable_scrq_irq(adapter, scrq);
                __napi_schedule(&adapter->napi[scrq->scrq_num]);
        }

        return IRQ_HANDLED;
}

static int init_sub_crq_irqs(struct ibmvnic_adapter *adapter)
{
        struct device *dev = &adapter->vdev->dev;
        struct ibmvnic_sub_crq_queue *scrq;
        int i = 0, j = 0;
        int rc = 0;

        for (i = 0; i < adapter->req_tx_queues; i++) {
                netdev_dbg(adapter->netdev, "Initializing tx_scrq[%d] irq\n",
                           i);
                scrq = adapter->tx_scrq[i];
                scrq->irq = irq_create_mapping(NULL, scrq->hw_irq);

                if (!scrq->irq) {
                        rc = -EINVAL;
                        dev_err(dev, "Error mapping irq\n");
                        goto req_tx_irq_failed;
                }

                snprintf(scrq->name, sizeof(scrq->name), "ibmvnic-%x-tx%d",
                         adapter->vdev->unit_address, i);
                rc = request_irq(scrq->irq, ibmvnic_interrupt_tx,
                                 0, scrq->name, scrq);

                if (rc) {
                        dev_err(dev, "Couldn't register tx irq 0x%x. rc=%d\n",
                                scrq->irq, rc);
                        irq_dispose_mapping(scrq->irq);
                        goto req_tx_irq_failed;
                }
        }

        for (i = 0; i < adapter->req_rx_queues; i++) {
                netdev_dbg(adapter->netdev, "Initializing rx_scrq[%d] irq\n",
                           i);
                scrq = adapter->rx_scrq[i];
                scrq->irq = irq_create_mapping(NULL, scrq->hw_irq);
                if (!scrq->irq) {
                        rc = -EINVAL;
                        dev_err(dev, "Error mapping irq\n");
                        goto req_rx_irq_failed;
                }
                snprintf(scrq->name, sizeof(scrq->name), "ibmvnic-%x-rx%d",
                         adapter->vdev->unit_address, i);
                rc = request_irq(scrq->irq, ibmvnic_interrupt_rx,
                                 0, scrq->name, scrq);
                if (rc) {
                        dev_err(dev, "Couldn't register rx irq 0x%x. rc=%d\n",
                                scrq->irq, rc);
                        irq_dispose_mapping(scrq->irq);
                        goto req_rx_irq_failed;
                }
        }

        cpus_read_lock();
        ibmvnic_set_affinity(adapter);
        cpus_read_unlock();

        return rc;

req_rx_irq_failed:
        for (j = 0; j < i; j++) {
                free_irq(adapter->rx_scrq[j]->irq, adapter->rx_scrq[j]);
                irq_dispose_mapping(adapter->rx_scrq[j]->irq);
        }
        i = adapter->req_tx_queues;
req_tx_irq_failed:
        for (j = 0; j < i; j++) {
                free_irq(adapter->tx_scrq[j]->irq, adapter->tx_scrq[j]);
                irq_dispose_mapping(adapter->tx_scrq[j]->irq);
        }
        release_sub_crqs(adapter, 1);
        return rc;
}

static int init_sub_crqs(struct ibmvnic_adapter *adapter)
{
        struct device *dev = &adapter->vdev->dev;
        struct ibmvnic_sub_crq_queue **allqueues;
        int registered_queues = 0;
        int total_queues;
        int more = 0;
        int i;

        total_queues = adapter->req_tx_queues + adapter->req_rx_queues;

        allqueues = kcalloc(total_queues, sizeof(*allqueues), GFP_KERNEL);
        if (!allqueues)
                return -ENOMEM;

        for (i = 0; i < total_queues; i++) {
                allqueues[i] = init_sub_crq_queue(adapter);
                if (!allqueues[i]) {
                        dev_warn(dev, "Couldn't allocate all sub-crqs\n");
                        break;
                }
                registered_queues++;
        }

        /* Make sure we were able to register the minimum number of queues */
        if (registered_queues <
            adapter->min_tx_queues + adapter->min_rx_queues) {
                dev_err(dev, "Fatal: Couldn't init  min number of sub-crqs\n");
                goto tx_failed;
        }

        /* Distribute the failed allocated queues*/
        for (i = 0; i < total_queues - registered_queues + more ; i++) {
                netdev_dbg(adapter->netdev, "Reducing number of queues\n");
                switch (i % 3) {
                case 0:
                        if (adapter->req_rx_queues > adapter->min_rx_queues)
                                adapter->req_rx_queues--;
                        else
                                more++;
                        break;
                case 1:
                        if (adapter->req_tx_queues > adapter->min_tx_queues)
                                adapter->req_tx_queues--;
                        else
                                more++;
                        break;
                }
        }

        adapter->tx_scrq = kcalloc(adapter->req_tx_queues,
                                   sizeof(*adapter->tx_scrq), GFP_KERNEL);
        if (!adapter->tx_scrq)
                goto tx_failed;

        for (i = 0; i < adapter->req_tx_queues; i++) {
                adapter->tx_scrq[i] = allqueues[i];
                adapter->tx_scrq[i]->pool_index = i;
                adapter->num_active_tx_scrqs++;
        }

        adapter->rx_scrq = kcalloc(adapter->req_rx_queues,
                                   sizeof(*adapter->rx_scrq), GFP_KERNEL);
        if (!adapter->rx_scrq)
                goto rx_failed;

        for (i = 0; i < adapter->req_rx_queues; i++) {
                adapter->rx_scrq[i] = allqueues[i + adapter->req_tx_queues];
                adapter->rx_scrq[i]->scrq_num = i;
                adapter->num_active_rx_scrqs++;
        }

        kfree(allqueues);
        return 0;

rx_failed:
        kfree(adapter->tx_scrq);
        adapter->tx_scrq = NULL;
tx_failed:
        for (i = 0; i < registered_queues; i++)
                release_sub_crq_queue(adapter, allqueues[i], 1);
        kfree(allqueues);
        return -ENOMEM;
}

static void send_request_cap(struct ibmvnic_adapter *adapter, int retry)
{
        struct device *dev = &adapter->vdev->dev;
        union ibmvnic_crq crq;
        int max_entries;
        int cap_reqs;

        /* We send out 6 or 7 REQUEST_CAPABILITY CRQs below (depending on
         * the PROMISC flag). Initialize this count upfront. When the tasklet
         * receives a response to all of these, it will send the next protocol
         * message (QUERY_IP_OFFLOAD).
         */
        if (!(adapter->netdev->flags & IFF_PROMISC) ||
            adapter->promisc_supported)
                cap_reqs = 7;
        else
                cap_reqs = 6;

        if (!retry) {
                /* Sub-CRQ entries are 32 byte long */
                int entries_page = 4 * PAGE_SIZE / (sizeof(u64) * 4);

                atomic_set(&adapter->running_cap_crqs, cap_reqs);

                if (adapter->min_tx_entries_per_subcrq > entries_page ||
                    adapter->min_rx_add_entries_per_subcrq > entries_page) {
                        dev_err(dev, "Fatal, invalid entries per sub-crq\n");
                        return;
                }

                if (adapter->desired.mtu)
                        adapter->req_mtu = adapter->desired.mtu;
                else
                        adapter->req_mtu = adapter->netdev->mtu + ETH_HLEN;

                if (!adapter->desired.tx_entries)
                        adapter->desired.tx_entries =
                                        adapter->max_tx_entries_per_subcrq;
                if (!adapter->desired.rx_entries)
                        adapter->desired.rx_entries =
                                        adapter->max_rx_add_entries_per_subcrq;

                max_entries = IBMVNIC_LTB_SET_SIZE /
                              (adapter->req_mtu + IBMVNIC_BUFFER_HLEN);

                if ((adapter->req_mtu + IBMVNIC_BUFFER_HLEN) *
                        adapter->desired.tx_entries > IBMVNIC_LTB_SET_SIZE) {
                        adapter->desired.tx_entries = max_entries;
                }

                if ((adapter->req_mtu + IBMVNIC_BUFFER_HLEN) *
                        adapter->desired.rx_entries > IBMVNIC_LTB_SET_SIZE) {
                        adapter->desired.rx_entries = max_entries;
                }

                if (adapter->desired.tx_entries)
                        adapter->req_tx_entries_per_subcrq =
                                        adapter->desired.tx_entries;
                else
                        adapter->req_tx_entries_per_subcrq =
                                        adapter->max_tx_entries_per_subcrq;

                if (adapter->desired.rx_entries)
                        adapter->req_rx_add_entries_per_subcrq =
                                        adapter->desired.rx_entries;
                else
                        adapter->req_rx_add_entries_per_subcrq =
                                        adapter->max_rx_add_entries_per_subcrq;

                if (adapter->desired.tx_queues)
                        adapter->req_tx_queues =
                                        adapter->desired.tx_queues;
                else
                        adapter->req_tx_queues =
                                        adapter->opt_tx_comp_sub_queues;

                if (adapter->desired.rx_queues)
                        adapter->req_rx_queues =
                                        adapter->desired.rx_queues;
                else
                        adapter->req_rx_queues =
                                        adapter->opt_rx_comp_queues;

                adapter->req_rx_add_queues = adapter->max_rx_add_queues;
        } else {
                atomic_add(cap_reqs, &adapter->running_cap_crqs);
        }
        memset(&crq, 0, sizeof(crq));
        crq.request_capability.first = IBMVNIC_CRQ_CMD;
        crq.request_capability.cmd = REQUEST_CAPABILITY;

        crq.request_capability.capability = cpu_to_be16(REQ_TX_QUEUES);
        crq.request_capability.number = cpu_to_be64(adapter->req_tx_queues);
        cap_reqs--;
        ibmvnic_send_crq(adapter, &crq);

        crq.request_capability.capability = cpu_to_be16(REQ_RX_QUEUES);
        crq.request_capability.number = cpu_to_be64(adapter->req_rx_queues);
        cap_reqs--;
        ibmvnic_send_crq(adapter, &crq);

        crq.request_capability.capability = cpu_to_be16(REQ_RX_ADD_QUEUES);
        crq.request_capability.number = cpu_to_be64(adapter->req_rx_add_queues);
        cap_reqs--;
        ibmvnic_send_crq(adapter, &crq);

        crq.request_capability.capability =
            cpu_to_be16(REQ_TX_ENTRIES_PER_SUBCRQ);
        crq.request_capability.number =
            cpu_to_be64(adapter->req_tx_entries_per_subcrq);
        cap_reqs--;
        ibmvnic_send_crq(adapter, &crq);

        crq.request_capability.capability =
            cpu_to_be16(REQ_RX_ADD_ENTRIES_PER_SUBCRQ);
        crq.request_capability.number =
            cpu_to_be64(adapter->req_rx_add_entries_per_subcrq);
        cap_reqs--;
        ibmvnic_send_crq(adapter, &crq);

        crq.request_capability.capability = cpu_to_be16(REQ_MTU);
        crq.request_capability.number = cpu_to_be64(adapter->req_mtu);
        cap_reqs--;
        ibmvnic_send_crq(adapter, &crq);

        if (adapter->netdev->flags & IFF_PROMISC) {
                if (adapter->promisc_supported) {
                        crq.request_capability.capability =
                            cpu_to_be16(PROMISC_REQUESTED);
                        crq.request_capability.number = cpu_to_be64(1);
                        cap_reqs--;
                        ibmvnic_send_crq(adapter, &crq);
                }
        } else {
                crq.request_capability.capability =
                    cpu_to_be16(PROMISC_REQUESTED);
                crq.request_capability.number = cpu_to_be64(0);
                cap_reqs--;
                ibmvnic_send_crq(adapter, &crq);
        }

        /* Keep at end to catch any discrepancy between expected and actual
         * CRQs sent.
         */
        WARN_ON(cap_reqs != 0);
}

static int pending_scrq(struct ibmvnic_adapter *adapter,
                        struct ibmvnic_sub_crq_queue *scrq)
{
        union sub_crq *entry = &scrq->msgs[scrq->cur];
        int rc;

        rc = !!(entry->generic.first & IBMVNIC_CRQ_CMD_RSP);

        /* Ensure that the SCRQ valid flag is loaded prior to loading the
         * contents of the SCRQ descriptor
         */
        dma_rmb();

        return rc;
}

static union sub_crq *ibmvnic_next_scrq(struct ibmvnic_adapter *adapter,
                                        struct ibmvnic_sub_crq_queue *scrq)
{
        union sub_crq *entry;
        unsigned long flags;

        spin_lock_irqsave(&scrq->lock, flags);
        entry = &scrq->msgs[scrq->cur];
        if (entry->generic.first & IBMVNIC_CRQ_CMD_RSP) {
                if (++scrq->cur == scrq->size)
                        scrq->cur = 0;
        } else {
                entry = NULL;
        }
        spin_unlock_irqrestore(&scrq->lock, flags);

        /* Ensure that the SCRQ valid flag is loaded prior to loading the
         * contents of the SCRQ descriptor
         */
        dma_rmb();

        return entry;
}

static union ibmvnic_crq *ibmvnic_next_crq(struct ibmvnic_adapter *adapter)
{
        struct ibmvnic_crq_queue *queue = &adapter->crq;
        union ibmvnic_crq *crq;

        crq = &queue->msgs[queue->cur];
        if (crq->generic.first & IBMVNIC_CRQ_CMD_RSP) {
                if (++queue->cur == queue->size)
                        queue->cur = 0;
        } else {
                crq = NULL;
        }

        return crq;
}

static void print_subcrq_error(struct device *dev, int rc, const char *func)
{
        switch (rc) {
        case H_PARAMETER:
                dev_warn_ratelimited(dev,
                                     "%s failed: Send request is malformed or adapter failover pending. (rc=%d)\n",
                                     func, rc);
                break;
        case H_CLOSED:
                dev_warn_ratelimited(dev,
                                     "%s failed: Backing queue closed. Adapter is down or failover pending. (rc=%d)\n",
                                     func, rc);
                break;
        default:
                dev_err_ratelimited(dev, "%s failed: (rc=%d)\n", func, rc);
                break;
        }
}

static int send_subcrq_indirect(struct ibmvnic_adapter *adapter,
                                u64 remote_handle, u64 ioba, u64 num_entries)
{
        unsigned int ua = adapter->vdev->unit_address;
        struct device *dev = &adapter->vdev->dev;
        int rc;

        /* Make sure the hypervisor sees the complete request */
        dma_wmb();
        rc = plpar_hcall_norets(H_SEND_SUB_CRQ_INDIRECT, ua,
                                cpu_to_be64(remote_handle),
                                ioba, num_entries);

        if (rc)
                print_subcrq_error(dev, rc, __func__);

        return rc;
}

static int ibmvnic_send_crq(struct ibmvnic_adapter *adapter,
                            union ibmvnic_crq *crq)
{
        unsigned int ua = adapter->vdev->unit_address;
        struct device *dev = &adapter->vdev->dev;
        u64 *u64_crq = (u64 *)crq;
        int rc;

        netdev_dbg(adapter->netdev, "Sending CRQ: %016lx %016lx\n",
                   (unsigned long)cpu_to_be64(u64_crq[0]),
                   (unsigned long)cpu_to_be64(u64_crq[1]));

        if (!adapter->crq.active &&
            crq->generic.first != IBMVNIC_CRQ_INIT_CMD) {
                dev_warn(dev, "Invalid request detected while CRQ is inactive, possible device state change during reset\n");
                return -EINVAL;
        }

        /* Make sure the hypervisor sees the complete request */
        dma_wmb();

        rc = plpar_hcall_norets(H_SEND_CRQ, ua,
                                cpu_to_be64(u64_crq[0]),
                                cpu_to_be64(u64_crq[1]));

        if (rc) {
                if (rc == H_CLOSED) {
                        dev_warn(dev, "CRQ Queue closed\n");
                        /* do not reset, report the fail, wait for passive init from server */
                }

                dev_warn(dev, "Send error (rc=%d)\n", rc);
        }

        return rc;
}

static int ibmvnic_send_crq_init(struct ibmvnic_adapter *adapter)
{
        struct device *dev = &adapter->vdev->dev;
        union ibmvnic_crq crq;
        int retries = 100;
        int rc;

        memset(&crq, 0, sizeof(crq));
        crq.generic.first = IBMVNIC_CRQ_INIT_CMD;
        crq.generic.cmd = IBMVNIC_CRQ_INIT;
        netdev_dbg(adapter->netdev, "Sending CRQ init\n");

        do {
                rc = ibmvnic_send_crq(adapter, &crq);
                if (rc != H_CLOSED)
                        break;
                retries--;
                msleep(50);

        } while (retries > 0);

        if (rc) {
                dev_err(dev, "Failed to send init request, rc = %d\n", rc);
                return rc;
        }

        return 0;
}

struct vnic_login_client_data {
        u8      type;
        __be16  len;
        char    name[];
} __packed;

static int vnic_client_data_len(struct ibmvnic_adapter *adapter)
{
        int len;

        /* Calculate the amount of buffer space needed for the
         * vnic client data in the login buffer. There are four entries,
         * OS name, LPAR name, device name, and a null last entry.
         */
        len = 4 * sizeof(struct vnic_login_client_data);
        len += 6; /* "Linux" plus NULL */
        len += strlen(utsname()->nodename) + 1;
        len += strlen(adapter->netdev->name) + 1;

        return len;
}

static void vnic_add_client_data(struct ibmvnic_adapter *adapter,
                                 struct vnic_login_client_data *vlcd)
{
        const char *os_name = "Linux";
        int len;

        /* Type 1 - LPAR OS */
        vlcd->type = 1;
        len = strlen(os_name) + 1;
        vlcd->len = cpu_to_be16(len);
        strscpy(vlcd->name, os_name, len);
        vlcd = (struct vnic_login_client_data *)(vlcd->name + len);

        /* Type 2 - LPAR name */
        vlcd->type = 2;
        len = strlen(utsname()->nodename) + 1;
        vlcd->len = cpu_to_be16(len);
        strscpy(vlcd->name, utsname()->nodename, len);
        vlcd = (struct vnic_login_client_data *)(vlcd->name + len);

        /* Type 3 - device name */
        vlcd->type = 3;
        len = strlen(adapter->netdev->name) + 1;
        vlcd->len = cpu_to_be16(len);
        strscpy(vlcd->name, adapter->netdev->name, len);
}

static int send_login(struct ibmvnic_adapter *adapter)
{
        struct ibmvnic_login_rsp_buffer *login_rsp_buffer;
        struct ibmvnic_login_buffer *login_buffer;
        struct device *dev = &adapter->vdev->dev;
        struct vnic_login_client_data *vlcd;
        dma_addr_t rsp_buffer_token;
        dma_addr_t buffer_token;
        size_t rsp_buffer_size;
        union ibmvnic_crq crq;
        int client_data_len;
        size_t buffer_size;
        __be64 *tx_list_p;
        __be64 *rx_list_p;
        int rc;
        int i;

        if (!adapter->tx_scrq || !adapter->rx_scrq) {
                netdev_err(adapter->netdev,
                           "RX or TX queues are not allocated, device login failed\n");
                return -ENOMEM;
        }

        release_login_buffer(adapter);
        release_login_rsp_buffer(adapter);

        client_data_len = vnic_client_data_len(adapter);

        buffer_size =
            sizeof(struct ibmvnic_login_buffer) +
            sizeof(u64) * (adapter->req_tx_queues + adapter->req_rx_queues) +
            client_data_len;

        login_buffer = kzalloc(buffer_size, GFP_ATOMIC);
        if (!login_buffer)
                goto buf_alloc_failed;

        buffer_token = dma_map_single(dev, login_buffer, buffer_size,
                                      DMA_TO_DEVICE);
        if (dma_mapping_error(dev, buffer_token)) {
                dev_err(dev, "Couldn't map login buffer\n");
                goto buf_map_failed;
        }

        rsp_buffer_size = sizeof(struct ibmvnic_login_rsp_buffer) +
                          sizeof(u64) * adapter->req_tx_queues +
                          sizeof(u64) * adapter->req_rx_queues +
                          sizeof(u64) * adapter->req_rx_queues +
                          sizeof(u8) * IBMVNIC_TX_DESC_VERSIONS;

        login_rsp_buffer = kmalloc(rsp_buffer_size, GFP_ATOMIC);
        if (!login_rsp_buffer)
                goto buf_rsp_alloc_failed;

        rsp_buffer_token = dma_map_single(dev, login_rsp_buffer,
                                          rsp_buffer_size, DMA_FROM_DEVICE);
        if (dma_mapping_error(dev, rsp_buffer_token)) {
                dev_err(dev, "Couldn't map login rsp buffer\n");
                goto buf_rsp_map_failed;
        }

        adapter->login_buf = login_buffer;
        adapter->login_buf_token = buffer_token;
        adapter->login_buf_sz = buffer_size;
        adapter->login_rsp_buf = login_rsp_buffer;
        adapter->login_rsp_buf_token = rsp_buffer_token;
        adapter->login_rsp_buf_sz = rsp_buffer_size;

        login_buffer->len = cpu_to_be32(buffer_size);
        login_buffer->version = cpu_to_be32(INITIAL_VERSION_LB);
        login_buffer->num_txcomp_subcrqs = cpu_to_be32(adapter->req_tx_queues);
        login_buffer->off_txcomp_subcrqs =
            cpu_to_be32(sizeof(struct ibmvnic_login_buffer));
        login_buffer->num_rxcomp_subcrqs = cpu_to_be32(adapter->req_rx_queues);
        login_buffer->off_rxcomp_subcrqs =
            cpu_to_be32(sizeof(struct ibmvnic_login_buffer) +
                        sizeof(u64) * adapter->req_tx_queues);
        login_buffer->login_rsp_ioba = cpu_to_be32(rsp_buffer_token);
        login_buffer->login_rsp_len = cpu_to_be32(rsp_buffer_size);

        tx_list_p = (__be64 *)((char *)login_buffer +
                                      sizeof(struct ibmvnic_login_buffer));
        rx_list_p = (__be64 *)((char *)login_buffer +
                                      sizeof(struct ibmvnic_login_buffer) +
                                      sizeof(u64) * adapter->req_tx_queues);

        for (i = 0; i < adapter->req_tx_queues; i++) {
                if (adapter->tx_scrq[i]) {
                        tx_list_p[i] =
                                cpu_to_be64(adapter->tx_scrq[i]->crq_num);
                }
        }

        for (i = 0; i < adapter->req_rx_queues; i++) {
                if (adapter->rx_scrq[i]) {
                        rx_list_p[i] =
                                cpu_to_be64(adapter->rx_scrq[i]->crq_num);
                }
        }

        /* Insert vNIC login client data */
        vlcd = (struct vnic_login_client_data *)
                ((char *)rx_list_p + (sizeof(u64) * adapter->req_rx_queues));
        login_buffer->client_data_offset =
                        cpu_to_be32((char *)vlcd - (char *)login_buffer);
        login_buffer->client_data_len = cpu_to_be32(client_data_len);

        vnic_add_client_data(adapter, vlcd);

        netdev_dbg(adapter->netdev, "Login Buffer:\n");
        for (i = 0; i < (adapter->login_buf_sz - 1) / 8 + 1; i++) {
                netdev_dbg(adapter->netdev, "%016lx\n",
                           ((unsigned long *)(adapter->login_buf))[i]);
        }

        memset(&crq, 0, sizeof(crq));
        crq.login.first = IBMVNIC_CRQ_CMD;
        crq.login.cmd = LOGIN;
        crq.login.ioba = cpu_to_be32(buffer_token);
        crq.login.len = cpu_to_be32(buffer_size);

        adapter->login_pending = true;
        rc = ibmvnic_send_crq(adapter, &crq);
        if (rc) {
                adapter->login_pending = false;
                netdev_err(adapter->netdev, "Failed to send login, rc=%d\n", rc);
                goto buf_send_failed;
        }

        return 0;

buf_send_failed:
        dma_unmap_single(dev, rsp_buffer_token, rsp_buffer_size,
                         DMA_FROM_DEVICE);
buf_rsp_map_failed:
        kfree(login_rsp_buffer);
        adapter->login_rsp_buf = NULL;
buf_rsp_alloc_failed:
        dma_unmap_single(dev, buffer_token, buffer_size, DMA_TO_DEVICE);
buf_map_failed:
        kfree(login_buffer);
        adapter->login_buf = NULL;
buf_alloc_failed:
        return -ENOMEM;
}

static int send_request_map(struct ibmvnic_adapter *adapter, dma_addr_t addr,
                            u32 len, u8 map_id)
{
        union ibmvnic_crq crq;

        memset(&crq, 0, sizeof(crq));
        crq.request_map.first = IBMVNIC_CRQ_CMD;
        crq.request_map.cmd = REQUEST_MAP;
        crq.request_map.map_id = map_id;
        crq.request_map.ioba = cpu_to_be32(addr);
        crq.request_map.len = cpu_to_be32(len);
        return ibmvnic_send_crq(adapter, &crq);
}

static int send_request_unmap(struct ibmvnic_adapter *adapter, u8 map_id)
{
        union ibmvnic_crq crq;

        memset(&crq, 0, sizeof(crq));
        crq.request_unmap.first = IBMVNIC_CRQ_CMD;
        crq.request_unmap.cmd = REQUEST_UNMAP;
        crq.request_unmap.map_id = map_id;
        return ibmvnic_send_crq(adapter, &crq);
}

static void send_query_map(struct ibmvnic_adapter *adapter)
{
        union ibmvnic_crq crq;

        memset(&crq, 0, sizeof(crq));
        crq.query_map.first = IBMVNIC_CRQ_CMD;
        crq.query_map.cmd = QUERY_MAP;
        ibmvnic_send_crq(adapter, &crq);
}

/* Send a series of CRQs requesting various capabilities of the VNIC server */
static void send_query_cap(struct ibmvnic_adapter *adapter)
{
        union ibmvnic_crq crq;
        int cap_reqs;

        /* We send out 25 QUERY_CAPABILITY CRQs below.  Initialize this count
         * upfront. When the tasklet receives a response to all of these, it
         * can send out the next protocol messaage (REQUEST_CAPABILITY).
         */
        cap_reqs = 25;

        atomic_set(&adapter->running_cap_crqs, cap_reqs);

        memset(&crq, 0, sizeof(crq));
        crq.query_capability.first = IBMVNIC_CRQ_CMD;
        crq.query_capability.cmd = QUERY_CAPABILITY;

        crq.query_capability.capability = cpu_to_be16(MIN_TX_QUEUES);
        ibmvnic_send_crq(adapter, &crq);
        cap_reqs--;

        crq.query_capability.capability = cpu_to_be16(MIN_RX_QUEUES);
        ibmvnic_send_crq(adapter, &crq);
        cap_reqs--;

        crq.query_capability.capability = cpu_to_be16(MIN_RX_ADD_QUEUES);
        ibmvnic_send_crq(adapter, &crq);
        cap_reqs--;

        crq.query_capability.capability = cpu_to_be16(MAX_TX_QUEUES);
        ibmvnic_send_crq(adapter, &crq);
        cap_reqs--;

        crq.query_capability.capability = cpu_to_be16(MAX_RX_QUEUES);
        ibmvnic_send_crq(adapter, &crq);
        cap_reqs--;

        crq.query_capability.capability = cpu_to_be16(MAX_RX_ADD_QUEUES);
        ibmvnic_send_crq(adapter, &crq);
        cap_reqs--;

        crq.query_capability.capability =
            cpu_to_be16(MIN_TX_ENTRIES_PER_SUBCRQ);
        ibmvnic_send_crq(adapter, &crq);
        cap_reqs--;

        crq.query_capability.capability =
            cpu_to_be16(MIN_RX_ADD_ENTRIES_PER_SUBCRQ);
        ibmvnic_send_crq(adapter, &crq);
        cap_reqs--;

        crq.query_capability.capability =
            cpu_to_be16(MAX_TX_ENTRIES_PER_SUBCRQ);
        ibmvnic_send_crq(adapter, &crq);
        cap_reqs--;

        crq.query_capability.capability =
            cpu_to_be16(MAX_RX_ADD_ENTRIES_PER_SUBCRQ);
        ibmvnic_send_crq(adapter, &crq);
        cap_reqs--;

        crq.query_capability.capability = cpu_to_be16(TCP_IP_OFFLOAD);
        ibmvnic_send_crq(adapter, &crq);
        cap_reqs--;

        crq.query_capability.capability = cpu_to_be16(PROMISC_SUPPORTED);
        ibmvnic_send_crq(adapter, &crq);
        cap_reqs--;

        crq.query_capability.capability = cpu_to_be16(MIN_MTU);
        ibmvnic_send_crq(adapter, &crq);
        cap_reqs--;

        crq.query_capability.capability = cpu_to_be16(MAX_MTU);
        ibmvnic_send_crq(adapter, &crq);
        cap_reqs--;

        crq.query_capability.capability = cpu_to_be16(MAX_MULTICAST_FILTERS);
        ibmvnic_send_crq(adapter, &crq);
        cap_reqs--;

        crq.query_capability.capability = cpu_to_be16(VLAN_HEADER_INSERTION);
        ibmvnic_send_crq(adapter, &crq);
        cap_reqs--;

        crq.query_capability.capability = cpu_to_be16(RX_VLAN_HEADER_INSERTION);
        ibmvnic_send_crq(adapter, &crq);
        cap_reqs--;

        crq.query_capability.capability = cpu_to_be16(MAX_TX_SG_ENTRIES);
        ibmvnic_send_crq(adapter, &crq);
        cap_reqs--;

        crq.query_capability.capability = cpu_to_be16(RX_SG_SUPPORTED);
        ibmvnic_send_crq(adapter, &crq);
        cap_reqs--;

        crq.query_capability.capability = cpu_to_be16(OPT_TX_COMP_SUB_QUEUES);
        ibmvnic_send_crq(adapter, &crq);
        cap_reqs--;

        crq.query_capability.capability = cpu_to_be16(OPT_RX_COMP_QUEUES);
        ibmvnic_send_crq(adapter, &crq);
        cap_reqs--;

        crq.query_capability.capability =
                        cpu_to_be16(OPT_RX_BUFADD_Q_PER_RX_COMP_Q);
        ibmvnic_send_crq(adapter, &crq);
        cap_reqs--;

        crq.query_capability.capability =
                        cpu_to_be16(OPT_TX_ENTRIES_PER_SUBCRQ);
        ibmvnic_send_crq(adapter, &crq);
        cap_reqs--;

        crq.query_capability.capability =
                        cpu_to_be16(OPT_RXBA_ENTRIES_PER_SUBCRQ);
        ibmvnic_send_crq(adapter, &crq);
        cap_reqs--;

        crq.query_capability.capability = cpu_to_be16(TX_RX_DESC_REQ);

        ibmvnic_send_crq(adapter, &crq);
        cap_reqs--;

        /* Keep at end to catch any discrepancy between expected and actual
         * CRQs sent.
         */
        WARN_ON(cap_reqs != 0);
}

static void send_query_ip_offload(struct ibmvnic_adapter *adapter)
{
        int buf_sz = sizeof(struct ibmvnic_query_ip_offload_buffer);
        struct device *dev = &adapter->vdev->dev;
        union ibmvnic_crq crq;

        adapter->ip_offload_tok =
                dma_map_single(dev,
                               &adapter->ip_offload_buf,
                               buf_sz,
                               DMA_FROM_DEVICE);

        if (dma_mapping_error(dev, adapter->ip_offload_tok)) {
                if (!firmware_has_feature(FW_FEATURE_CMO))
                        dev_err(dev, "Couldn't map offload buffer\n");
                return;
        }

        memset(&crq, 0, sizeof(crq));
        crq.query_ip_offload.first = IBMVNIC_CRQ_CMD;
        crq.query_ip_offload.cmd = QUERY_IP_OFFLOAD;
        crq.query_ip_offload.len = cpu_to_be32(buf_sz);
        crq.query_ip_offload.ioba =
            cpu_to_be32(adapter->ip_offload_tok);

        ibmvnic_send_crq(adapter, &crq);
}

static void send_control_ip_offload(struct ibmvnic_adapter *adapter)
{
        struct ibmvnic_control_ip_offload_buffer *ctrl_buf = &adapter->ip_offload_ctrl;
        struct ibmvnic_query_ip_offload_buffer *buf = &adapter->ip_offload_buf;
        struct device *dev = &adapter->vdev->dev;
        netdev_features_t old_hw_features = 0;
        union ibmvnic_crq crq;

        adapter->ip_offload_ctrl_tok =
                dma_map_single(dev,
                               ctrl_buf,
                               sizeof(adapter->ip_offload_ctrl),
                               DMA_TO_DEVICE);

        if (dma_mapping_error(dev, adapter->ip_offload_ctrl_tok)) {
                dev_err(dev, "Couldn't map ip offload control buffer\n");
                return;
        }

        ctrl_buf->len = cpu_to_be32(sizeof(adapter->ip_offload_ctrl));
        ctrl_buf->version = cpu_to_be32(INITIAL_VERSION_IOB);
        ctrl_buf->ipv4_chksum = buf->ipv4_chksum;
        ctrl_buf->ipv6_chksum = buf->ipv6_chksum;
        ctrl_buf->tcp_ipv4_chksum = buf->tcp_ipv4_chksum;
        ctrl_buf->udp_ipv4_chksum = buf->udp_ipv4_chksum;
        ctrl_buf->tcp_ipv6_chksum = buf->tcp_ipv6_chksum;
        ctrl_buf->udp_ipv6_chksum = buf->udp_ipv6_chksum;
        ctrl_buf->large_tx_ipv4 = buf->large_tx_ipv4;
        ctrl_buf->large_tx_ipv6 = buf->large_tx_ipv6;

        /* large_rx disabled for now, additional features needed */
        ctrl_buf->large_rx_ipv4 = 0;
        ctrl_buf->large_rx_ipv6 = 0;

        if (adapter->state != VNIC_PROBING) {
                old_hw_features = adapter->netdev->hw_features;
                adapter->netdev->hw_features = 0;
        }

        adapter->netdev->hw_features = NETIF_F_SG | NETIF_F_GSO | NETIF_F_GRO;

        if (buf->tcp_ipv4_chksum || buf->udp_ipv4_chksum)
                adapter->netdev->hw_features |= NETIF_F_IP_CSUM;

        if (buf->tcp_ipv6_chksum || buf->udp_ipv6_chksum)
                adapter->netdev->hw_features |= NETIF_F_IPV6_CSUM;

        if ((adapter->netdev->features &
            (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM)))
                adapter->netdev->hw_features |= NETIF_F_RXCSUM;

        if (buf->large_tx_ipv4)
                adapter->netdev->hw_features |= NETIF_F_TSO;
        if (buf->large_tx_ipv6)
                adapter->netdev->hw_features |= NETIF_F_TSO6;

        if (adapter->state == VNIC_PROBING) {
                adapter->netdev->features |= adapter->netdev->hw_features;
        } else if (old_hw_features != adapter->netdev->hw_features) {
                netdev_features_t tmp = 0;

                /* disable features no longer supported */
                adapter->netdev->features &= adapter->netdev->hw_features;
                /* turn on features now supported if previously enabled */
                tmp = (old_hw_features ^ adapter->netdev->hw_features) &
                        adapter->netdev->hw_features;
                adapter->netdev->features |=
                                tmp & adapter->netdev->wanted_features;
        }

        memset(&crq, 0, sizeof(crq));
        crq.control_ip_offload.first = IBMVNIC_CRQ_CMD;
        crq.control_ip_offload.cmd = CONTROL_IP_OFFLOAD;
        crq.control_ip_offload.len =
            cpu_to_be32(sizeof(adapter->ip_offload_ctrl));
        crq.control_ip_offload.ioba = cpu_to_be32(adapter->ip_offload_ctrl_tok);
        ibmvnic_send_crq(adapter, &crq);
}

static void handle_vpd_size_rsp(union ibmvnic_crq *crq,
                                struct ibmvnic_adapter *adapter)
{
        struct device *dev = &adapter->vdev->dev;

        if (crq->get_vpd_size_rsp.rc.code) {
                dev_err(dev, "Error retrieving VPD size, rc=%x\n",
                        crq->get_vpd_size_rsp.rc.code);
                complete(&adapter->fw_done);
                return;
        }

        adapter->vpd->len = be64_to_cpu(crq->get_vpd_size_rsp.len);
        complete(&adapter->fw_done);
}

static void handle_vpd_rsp(union ibmvnic_crq *crq,
                           struct ibmvnic_adapter *adapter)
{
        struct device *dev = &adapter->vdev->dev;
        unsigned char *substr = NULL;
        u8 fw_level_len = 0;

        memset(adapter->fw_version, 0, 32);

        dma_unmap_single(dev, adapter->vpd->dma_addr, adapter->vpd->len,
                         DMA_FROM_DEVICE);

        if (crq->get_vpd_rsp.rc.code) {
                dev_err(dev, "Error retrieving VPD from device, rc=%x\n",
                        crq->get_vpd_rsp.rc.code);
                goto complete;
        }

        /* get the position of the firmware version info
         * located after the ASCII 'RM' substring in the buffer
         */
        substr = strnstr(adapter->vpd->buff, "RM", adapter->vpd->len);
        if (!substr) {
                dev_info(dev, "Warning - No FW level has been provided in the VPD buffer by the VIOS Server\n");
                goto complete;
        }

        /* get length of firmware level ASCII substring */
        if ((substr + 2) < (adapter->vpd->buff + adapter->vpd->len)) {
                fw_level_len = *(substr + 2);
        } else {
                dev_info(dev, "Length of FW substr extrapolated VDP buff\n");
                goto complete;
        }

        /* copy firmware version string from vpd into adapter */
        if ((substr + 3 + fw_level_len) <
            (adapter->vpd->buff + adapter->vpd->len)) {
                strscpy(adapter->fw_version, substr + 3,
                        sizeof(adapter->fw_version));
        } else {
                dev_info(dev, "FW substr extrapolated VPD buff\n");
        }

complete:
        if (adapter->fw_version[0] == '\0')
                strscpy((char *)adapter->fw_version, "N/A", sizeof(adapter->fw_version));
        complete(&adapter->fw_done);
}

static void handle_query_ip_offload_rsp(struct ibmvnic_adapter *adapter)
{
        struct device *dev = &adapter->vdev->dev;
        struct ibmvnic_query_ip_offload_buffer *buf = &adapter->ip_offload_buf;
        int i;

        dma_unmap_single(dev, adapter->ip_offload_tok,
                         sizeof(adapter->ip_offload_buf), DMA_FROM_DEVICE);

        netdev_dbg(adapter->netdev, "Query IP Offload Buffer:\n");
        for (i = 0; i < (sizeof(adapter->ip_offload_buf) - 1) / 8 + 1; i++)
                netdev_dbg(adapter->netdev, "%016lx\n",
                           ((unsigned long *)(buf))[i]);

        netdev_dbg(adapter->netdev, "ipv4_chksum = %d\n", buf->ipv4_chksum);
        netdev_dbg(adapter->netdev, "ipv6_chksum = %d\n", buf->ipv6_chksum);
        netdev_dbg(adapter->netdev, "tcp_ipv4_chksum = %d\n",
                   buf->tcp_ipv4_chksum);
        netdev_dbg(adapter->netdev, "tcp_ipv6_chksum = %d\n",
                   buf->tcp_ipv6_chksum);
        netdev_dbg(adapter->netdev, "udp_ipv4_chksum = %d\n",
                   buf->udp_ipv4_chksum);
        netdev_dbg(adapter->netdev, "udp_ipv6_chksum = %d\n",
                   buf->udp_ipv6_chksum);
        netdev_dbg(adapter->netdev, "large_tx_ipv4 = %d\n",
                   buf->large_tx_ipv4);
        netdev_dbg(adapter->netdev, "large_tx_ipv6 = %d\n",
                   buf->large_tx_ipv6);
        netdev_dbg(adapter->netdev, "large_rx_ipv4 = %d\n",
                   buf->large_rx_ipv4);
        netdev_dbg(adapter->netdev, "large_rx_ipv6 = %d\n",
                   buf->large_rx_ipv6);
        netdev_dbg(adapter->netdev, "max_ipv4_hdr_sz = %d\n",
                   buf->max_ipv4_header_size);
        netdev_dbg(adapter->netdev, "max_ipv6_hdr_sz = %d\n",
                   buf->max_ipv6_header_size);
        netdev_dbg(adapter->netdev, "max_tcp_hdr_size = %d\n",
                   buf->max_tcp_header_size);
        netdev_dbg(adapter->netdev, "max_udp_hdr_size = %d\n",
                   buf->max_udp_header_size);
        netdev_dbg(adapter->netdev, "max_large_tx_size = %d\n",
                   buf->max_large_tx_size);
        netdev_dbg(adapter->netdev, "max_large_rx_size = %d\n",
                   buf->max_large_rx_size);
        netdev_dbg(adapter->netdev, "ipv6_ext_hdr = %d\n",
                   buf->ipv6_extension_header);
        netdev_dbg(adapter->netdev, "tcp_pseudosum_req = %d\n",
                   buf->tcp_pseudosum_req);
        netdev_dbg(adapter->netdev, "num_ipv6_ext_hd = %d\n",
                   buf->num_ipv6_ext_headers);
        netdev_dbg(adapter->netdev, "off_ipv6_ext_hd = %d\n",
                   buf->off_ipv6_ext_headers);

        send_control_ip_offload(adapter);
}

static const char *ibmvnic_fw_err_cause(u16 cause)
{
        switch (cause) {
        case ADAPTER_PROBLEM:
                return "adapter problem";
        case BUS_PROBLEM:
                return "bus problem";
        case FW_PROBLEM:
                return "firmware problem";
        case DD_PROBLEM:
                return "device driver problem";
        case EEH_RECOVERY:
                return "EEH recovery";
        case FW_UPDATED:
                return "firmware updated";
        case LOW_MEMORY:
                return "low Memory";
        default:
                return "unknown";
        }
}

static void handle_error_indication(union ibmvnic_crq *crq,
                                    struct ibmvnic_adapter *adapter)
{
        struct device *dev = &adapter->vdev->dev;
        u16 cause;

        cause = be16_to_cpu(crq->error_indication.error_cause);

        dev_warn_ratelimited(dev,
                             "Firmware reports %serror, cause: %s. Starting recovery...\n",
                             crq->error_indication.flags
                                & IBMVNIC_FATAL_ERROR ? "FATAL " : "",
                             ibmvnic_fw_err_cause(cause));

        if (crq->error_indication.flags & IBMVNIC_FATAL_ERROR)
                ibmvnic_reset(adapter, VNIC_RESET_FATAL);
        else
                ibmvnic_reset(adapter, VNIC_RESET_NON_FATAL);
}

static int handle_change_mac_rsp(union ibmvnic_crq *crq,
                                 struct ibmvnic_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;
        struct device *dev = &adapter->vdev->dev;
        long rc;

        rc = crq->change_mac_addr_rsp.rc.code;
        if (rc) {
                dev_err(dev, "Error %ld in CHANGE_MAC_ADDR_RSP\n", rc);
                goto out;
        }
        /* crq->change_mac_addr.mac_addr is the requested one
         * crq->change_mac_addr_rsp.mac_addr is the returned valid one.
         */
        eth_hw_addr_set(netdev, &crq->change_mac_addr_rsp.mac_addr[0]);
        ether_addr_copy(adapter->mac_addr,
                        &crq->change_mac_addr_rsp.mac_addr[0]);
out:
        complete(&adapter->fw_done);
        return rc;
}

static void handle_request_cap_rsp(union ibmvnic_crq *crq,
                                   struct ibmvnic_adapter *adapter)
{
        struct device *dev = &adapter->vdev->dev;
        u64 *req_value;
        char *name;

        atomic_dec(&adapter->running_cap_crqs);
        netdev_dbg(adapter->netdev, "Outstanding request-caps: %d\n",
                   atomic_read(&adapter->running_cap_crqs));
        switch (be16_to_cpu(crq->request_capability_rsp.capability)) {
        case REQ_TX_QUEUES:
                req_value = &adapter->req_tx_queues;
                name = "tx";
                break;
        case REQ_RX_QUEUES:
                req_value = &adapter->req_rx_queues;
                name = "rx";
                break;
        case REQ_RX_ADD_QUEUES:
                req_value = &adapter->req_rx_add_queues;
                name = "rx_add";
                break;
        case REQ_TX_ENTRIES_PER_SUBCRQ:
                req_value = &adapter->req_tx_entries_per_subcrq;
                name = "tx_entries_per_subcrq";
                break;
        case REQ_RX_ADD_ENTRIES_PER_SUBCRQ:
                req_value = &adapter->req_rx_add_entries_per_subcrq;
                name = "rx_add_entries_per_subcrq";
                break;
        case REQ_MTU:
                req_value = &adapter->req_mtu;
                name = "mtu";
                break;
        case PROMISC_REQUESTED:
                req_value = &adapter->promisc;
                name = "promisc";
                break;
        default:
                dev_err(dev, "Got invalid cap request rsp %d\n",
                        crq->request_capability.capability);
                return;
        }

        switch (crq->request_capability_rsp.rc.code) {
        case SUCCESS:
                break;
        case PARTIALSUCCESS:
                dev_info(dev, "req=%lld, rsp=%ld in %s queue, retrying.\n",
                         *req_value,
                         (long)be64_to_cpu(crq->request_capability_rsp.number),
                         name);

                if (be16_to_cpu(crq->request_capability_rsp.capability) ==
                    REQ_MTU) {
                        pr_err("mtu of %llu is not supported. Reverting.\n",
                               *req_value);
                        *req_value = adapter->fallback.mtu;
                } else {
                        *req_value =
                                be64_to_cpu(crq->request_capability_rsp.number);
                }

                send_request_cap(adapter, 1);
                return;
        default:
                dev_err(dev, "Error %d in request cap rsp\n",
                        crq->request_capability_rsp.rc.code);
                return;
        }

        /* Done receiving requested capabilities, query IP offload support */
        if (atomic_read(&adapter->running_cap_crqs) == 0)
                send_query_ip_offload(adapter);
}

static int handle_login_rsp(union ibmvnic_crq *login_rsp_crq,
                            struct ibmvnic_adapter *adapter)
{
        struct device *dev = &adapter->vdev->dev;
        struct net_device *netdev = adapter->netdev;
        struct ibmvnic_login_rsp_buffer *login_rsp = adapter->login_rsp_buf;
        struct ibmvnic_login_buffer *login = adapter->login_buf;
        u64 *tx_handle_array;
        u64 *rx_handle_array;
        int num_tx_pools;
        int num_rx_pools;
        u64 *size_array;
        u32 rsp_len;
        int i;

        /* CHECK: Test/set of login_pending does not need to be atomic
         * because only ibmvnic_tasklet tests/clears this.
         */
        if (!adapter->login_pending) {
                netdev_warn(netdev, "Ignoring unexpected login response\n");
                return 0;
        }
        adapter->login_pending = false;

        /* If the number of queues requested can't be allocated by the
         * server, the login response will return with code 1. We will need
         * to resend the login buffer with fewer queues requested.
         */
        if (login_rsp_crq->generic.rc.code) {
                adapter->init_done_rc = login_rsp_crq->generic.rc.code;
                complete(&adapter->init_done);
                return 0;
        }

        if (adapter->failover_pending) {
                adapter->init_done_rc = -EAGAIN;
                netdev_dbg(netdev, "Failover pending, ignoring login response\n");
                complete(&adapter->init_done);
                /* login response buffer will be released on reset */
                return 0;
        }

        netdev->mtu = adapter->req_mtu - ETH_HLEN;

        netdev_dbg(adapter->netdev, "Login Response Buffer:\n");
        for (i = 0; i < (adapter->login_rsp_buf_sz - 1) / 8 + 1; i++) {
                netdev_dbg(adapter->netdev, "%016lx\n",
                           ((unsigned long *)(adapter->login_rsp_buf))[i]);
        }

        /* Sanity checks */
        if (login->num_txcomp_subcrqs != login_rsp->num_txsubm_subcrqs ||
            (be32_to_cpu(login->num_rxcomp_subcrqs) *
             adapter->req_rx_add_queues !=
             be32_to_cpu(login_rsp->num_rxadd_subcrqs))) {
                dev_err(dev, "FATAL: Inconsistent login and login rsp\n");
                ibmvnic_reset(adapter, VNIC_RESET_FATAL);
                return -EIO;
        }

        rsp_len = be32_to_cpu(login_rsp->len);
        if (be32_to_cpu(login->login_rsp_len) < rsp_len ||
            rsp_len <= be32_to_cpu(login_rsp->off_txsubm_subcrqs) ||
            rsp_len <= be32_to_cpu(login_rsp->off_rxadd_subcrqs) ||
            rsp_len <= be32_to_cpu(login_rsp->off_rxadd_buff_size) ||
            rsp_len <= be32_to_cpu(login_rsp->off_supp_tx_desc)) {
                /* This can happen if a login request times out and there are
                 * 2 outstanding login requests sent, the LOGIN_RSP crq
                 * could have been for the older login request. So we are
                 * parsing the newer response buffer which may be incomplete
                 */
                dev_err(dev, "FATAL: Login rsp offsets/lengths invalid\n");
                ibmvnic_reset(adapter, VNIC_RESET_FATAL);
                return -EIO;
        }

        size_array = (u64 *)((u8 *)(adapter->login_rsp_buf) +
                be32_to_cpu(adapter->login_rsp_buf->off_rxadd_buff_size));
        /* variable buffer sizes are not supported, so just read the
         * first entry.
         */
        adapter->cur_rx_buf_sz = be64_to_cpu(size_array[0]);

        num_tx_pools = be32_to_cpu(adapter->login_rsp_buf->num_txsubm_subcrqs);
        num_rx_pools = be32_to_cpu(adapter->login_rsp_buf->num_rxadd_subcrqs);

        tx_handle_array = (u64 *)((u8 *)(adapter->login_rsp_buf) +
                                  be32_to_cpu(adapter->login_rsp_buf->off_txsubm_subcrqs));
        rx_handle_array = (u64 *)((u8 *)(adapter->login_rsp_buf) +
                                  be32_to_cpu(adapter->login_rsp_buf->off_rxadd_subcrqs));

        for (i = 0; i < num_tx_pools; i++)
                adapter->tx_scrq[i]->handle = tx_handle_array[i];

        for (i = 0; i < num_rx_pools; i++)
                adapter->rx_scrq[i]->handle = rx_handle_array[i];

        adapter->num_active_tx_scrqs = num_tx_pools;
        adapter->num_active_rx_scrqs = num_rx_pools;
        release_login_rsp_buffer(adapter);
        release_login_buffer(adapter);
        complete(&adapter->init_done);

        return 0;
}

static void handle_request_unmap_rsp(union ibmvnic_crq *crq,
                                     struct ibmvnic_adapter *adapter)
{
        struct device *dev = &adapter->vdev->dev;
        long rc;

        rc = crq->request_unmap_rsp.rc.code;
        if (rc)
                dev_err(dev, "Error %ld in REQUEST_UNMAP_RSP\n", rc);
}

static void handle_query_map_rsp(union ibmvnic_crq *crq,
                                 struct ibmvnic_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;
        struct device *dev = &adapter->vdev->dev;
        long rc;

        rc = crq->query_map_rsp.rc.code;
        if (rc) {
                dev_err(dev, "Error %ld in QUERY_MAP_RSP\n", rc);
                return;
        }
        netdev_dbg(netdev, "page_size = %d\ntot_pages = %u\nfree_pages = %u\n",
                   crq->query_map_rsp.page_size,
                   __be32_to_cpu(crq->query_map_rsp.tot_pages),
                   __be32_to_cpu(crq->query_map_rsp.free_pages));
}

static void handle_query_cap_rsp(union ibmvnic_crq *crq,
                                 struct ibmvnic_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;
        struct device *dev = &adapter->vdev->dev;
        long rc;

        atomic_dec(&adapter->running_cap_crqs);
        netdev_dbg(netdev, "Outstanding queries: %d\n",
                   atomic_read(&adapter->running_cap_crqs));
        rc = crq->query_capability.rc.code;
        if (rc) {
                dev_err(dev, "Error %ld in QUERY_CAP_RSP\n", rc);
                goto out;
        }

        switch (be16_to_cpu(crq->query_capability.capability)) {
        case MIN_TX_QUEUES:
                adapter->min_tx_queues =
                    be64_to_cpu(crq->query_capability.number);
                netdev_dbg(netdev, "min_tx_queues = %lld\n",
                           adapter->min_tx_queues);
                break;
        case MIN_RX_QUEUES:
                adapter->min_rx_queues =
                    be64_to_cpu(crq->query_capability.number);
                netdev_dbg(netdev, "min_rx_queues = %lld\n",
                           adapter->min_rx_queues);
                break;
        case MIN_RX_ADD_QUEUES:
                adapter->min_rx_add_queues =
                    be64_to_cpu(crq->query_capability.number);
                netdev_dbg(netdev, "min_rx_add_queues = %lld\n",
                           adapter->min_rx_add_queues);
                break;
        case MAX_TX_QUEUES:
                adapter->max_tx_queues =
                    be64_to_cpu(crq->query_capability.number);
                netdev_dbg(netdev, "max_tx_queues = %lld\n",
                           adapter->max_tx_queues);
                break;
        case MAX_RX_QUEUES:
                adapter->max_rx_queues =
                    be64_to_cpu(crq->query_capability.number);
                netdev_dbg(netdev, "max_rx_queues = %lld\n",
                           adapter->max_rx_queues);
                break;
        case MAX_RX_ADD_QUEUES:
                adapter->max_rx_add_queues =
                    be64_to_cpu(crq->query_capability.number);
                netdev_dbg(netdev, "max_rx_add_queues = %lld\n",
                           adapter->max_rx_add_queues);
                break;
        case MIN_TX_ENTRIES_PER_SUBCRQ:
                adapter->min_tx_entries_per_subcrq =
                    be64_to_cpu(crq->query_capability.number);
                netdev_dbg(netdev, "min_tx_entries_per_subcrq = %lld\n",
                           adapter->min_tx_entries_per_subcrq);
                break;
        case MIN_RX_ADD_ENTRIES_PER_SUBCRQ:
                adapter->min_rx_add_entries_per_subcrq =
                    be64_to_cpu(crq->query_capability.number);
                netdev_dbg(netdev, "min_rx_add_entrs_per_subcrq = %lld\n",
                           adapter->min_rx_add_entries_per_subcrq);
                break;
        case MAX_TX_ENTRIES_PER_SUBCRQ:
                adapter->max_tx_entries_per_subcrq =
                    be64_to_cpu(crq->query_capability.number);
                netdev_dbg(netdev, "max_tx_entries_per_subcrq = %lld\n",
                           adapter->max_tx_entries_per_subcrq);
                break;
        case MAX_RX_ADD_ENTRIES_PER_SUBCRQ:
                adapter->max_rx_add_entries_per_subcrq =
                    be64_to_cpu(crq->query_capability.number);
                netdev_dbg(netdev, "max_rx_add_entrs_per_subcrq = %lld\n",
                           adapter->max_rx_add_entries_per_subcrq);
                break;
        case TCP_IP_OFFLOAD:
                adapter->tcp_ip_offload =
                    be64_to_cpu(crq->query_capability.number);
                netdev_dbg(netdev, "tcp_ip_offload = %lld\n",
                           adapter->tcp_ip_offload);
                break;
        case PROMISC_SUPPORTED:
                adapter->promisc_supported =
                    be64_to_cpu(crq->query_capability.number);
                netdev_dbg(netdev, "promisc_supported = %lld\n",
                           adapter->promisc_supported);
                break;
        case MIN_MTU:
                adapter->min_mtu = be64_to_cpu(crq->query_capability.number);
                netdev->min_mtu = adapter->min_mtu - ETH_HLEN;
                netdev_dbg(netdev, "min_mtu = %lld\n", adapter->min_mtu);
                break;
        case MAX_MTU:
                adapter->max_mtu = be64_to_cpu(crq->query_capability.number);
                netdev->max_mtu = adapter->max_mtu - ETH_HLEN;
                netdev_dbg(netdev, "max_mtu = %lld\n", adapter->max_mtu);
                break;
        case MAX_MULTICAST_FILTERS:
                adapter->max_multicast_filters =
                    be64_to_cpu(crq->query_capability.number);
                netdev_dbg(netdev, "max_multicast_filters = %lld\n",
                           adapter->max_multicast_filters);
                break;
        case VLAN_HEADER_INSERTION:
                adapter->vlan_header_insertion =
                    be64_to_cpu(crq->query_capability.number);
                if (adapter->vlan_header_insertion)
                        netdev->features |= NETIF_F_HW_VLAN_STAG_TX;
                netdev_dbg(netdev, "vlan_header_insertion = %lld\n",
                           adapter->vlan_header_insertion);
                break;
        case RX_VLAN_HEADER_INSERTION:
                adapter->rx_vlan_header_insertion =
                    be64_to_cpu(crq->query_capability.number);
                netdev_dbg(netdev, "rx_vlan_header_insertion = %lld\n",
                           adapter->rx_vlan_header_insertion);
                break;
        case MAX_TX_SG_ENTRIES:
                adapter->max_tx_sg_entries =
                    be64_to_cpu(crq->query_capability.number);
                netdev_dbg(netdev, "max_tx_sg_entries = %lld\n",
                           adapter->max_tx_sg_entries);
                break;
        case RX_SG_SUPPORTED:
                adapter->rx_sg_supported =
                    be64_to_cpu(crq->query_capability.number);
                netdev_dbg(netdev, "rx_sg_supported = %lld\n",
                           adapter->rx_sg_supported);
                break;
        case OPT_TX_COMP_SUB_QUEUES:
                adapter->opt_tx_comp_sub_queues =
                    be64_to_cpu(crq->query_capability.number);
                netdev_dbg(netdev, "opt_tx_comp_sub_queues = %lld\n",
                           adapter->opt_tx_comp_sub_queues);
                break;
        case OPT_RX_COMP_QUEUES:
                adapter->opt_rx_comp_queues =
                    be64_to_cpu(crq->query_capability.number);
                netdev_dbg(netdev, "opt_rx_comp_queues = %lld\n",
                           adapter->opt_rx_comp_queues);
                break;
        case OPT_RX_BUFADD_Q_PER_RX_COMP_Q:
                adapter->opt_rx_bufadd_q_per_rx_comp_q =
                    be64_to_cpu(crq->query_capability.number);
                netdev_dbg(netdev, "opt_rx_bufadd_q_per_rx_comp_q = %lld\n",
                           adapter->opt_rx_bufadd_q_per_rx_comp_q);
                break;
        case OPT_TX_ENTRIES_PER_SUBCRQ:
                adapter->opt_tx_entries_per_subcrq =
                    be64_to_cpu(crq->query_capability.number);
                netdev_dbg(netdev, "opt_tx_entries_per_subcrq = %lld\n",
                           adapter->opt_tx_entries_per_subcrq);
                break;
        case OPT_RXBA_ENTRIES_PER_SUBCRQ:
                adapter->opt_rxba_entries_per_subcrq =
                    be64_to_cpu(crq->query_capability.number);
                netdev_dbg(netdev, "opt_rxba_entries_per_subcrq = %lld\n",
                           adapter->opt_rxba_entries_per_subcrq);
                break;
        case TX_RX_DESC_REQ:
                adapter->tx_rx_desc_req = crq->query_capability.number;
                netdev_dbg(netdev, "tx_rx_desc_req = %llx\n",
                           adapter->tx_rx_desc_req);
                break;

        default:
                netdev_err(netdev, "Got invalid cap rsp %d\n",
                           crq->query_capability.capability);
        }

out:
        if (atomic_read(&adapter->running_cap_crqs) == 0)
                send_request_cap(adapter, 0);
}

static int send_query_phys_parms(struct ibmvnic_adapter *adapter)
{
        union ibmvnic_crq crq;
        int rc;

        memset(&crq, 0, sizeof(crq));
        crq.query_phys_parms.first = IBMVNIC_CRQ_CMD;
        crq.query_phys_parms.cmd = QUERY_PHYS_PARMS;

        mutex_lock(&adapter->fw_lock);
        adapter->fw_done_rc = 0;
        reinit_completion(&adapter->fw_done);

        rc = ibmvnic_send_crq(adapter, &crq);
        if (rc) {
                mutex_unlock(&adapter->fw_lock);
                return rc;
        }

        rc = ibmvnic_wait_for_completion(adapter, &adapter->fw_done, 10000);
        if (rc) {
                mutex_unlock(&adapter->fw_lock);
                return rc;
        }

        mutex_unlock(&adapter->fw_lock);
        return adapter->fw_done_rc ? -EIO : 0;
}

static int handle_query_phys_parms_rsp(union ibmvnic_crq *crq,
                                       struct ibmvnic_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;
        int rc;
        __be32 rspeed = cpu_to_be32(crq->query_phys_parms_rsp.speed);

        rc = crq->query_phys_parms_rsp.rc.code;
        if (rc) {
                netdev_err(netdev, "Error %d in QUERY_PHYS_PARMS\n", rc);
                return rc;
        }
        switch (rspeed) {
        case IBMVNIC_10MBPS:
                adapter->speed = SPEED_10;
                break;
        case IBMVNIC_100MBPS:
                adapter->speed = SPEED_100;
                break;
        case IBMVNIC_1GBPS:
                adapter->speed = SPEED_1000;
                break;
        case IBMVNIC_10GBPS:
                adapter->speed = SPEED_10000;
                break;
        case IBMVNIC_25GBPS:
                adapter->speed = SPEED_25000;
                break;
        case IBMVNIC_40GBPS:
                adapter->speed = SPEED_40000;
                break;
        case IBMVNIC_50GBPS:
                adapter->speed = SPEED_50000;
                break;
        case IBMVNIC_100GBPS:
                adapter->speed = SPEED_100000;
                break;
        case IBMVNIC_200GBPS:
                adapter->speed = SPEED_200000;
                break;
        default:
                if (netif_carrier_ok(netdev))
                        netdev_warn(netdev, "Unknown speed 0x%08x\n", rspeed);
                adapter->speed = SPEED_UNKNOWN;
        }
        if (crq->query_phys_parms_rsp.flags1 & IBMVNIC_FULL_DUPLEX)
                adapter->duplex = DUPLEX_FULL;
        else if (crq->query_phys_parms_rsp.flags1 & IBMVNIC_HALF_DUPLEX)
                adapter->duplex = DUPLEX_HALF;
        else
                adapter->duplex = DUPLEX_UNKNOWN;

        return rc;
}

static void ibmvnic_handle_crq(union ibmvnic_crq *crq,
                               struct ibmvnic_adapter *adapter)
{
        struct ibmvnic_generic_crq *gen_crq = &crq->generic;
        struct net_device *netdev = adapter->netdev;
        struct device *dev = &adapter->vdev->dev;
        u64 *u64_crq = (u64 *)crq;
        long rc;

        netdev_dbg(netdev, "Handling CRQ: %016lx %016lx\n",
                   (unsigned long)cpu_to_be64(u64_crq[0]),
                   (unsigned long)cpu_to_be64(u64_crq[1]));
        switch (gen_crq->first) {
        case IBMVNIC_CRQ_INIT_RSP:
                switch (gen_crq->cmd) {
                case IBMVNIC_CRQ_INIT:
                        dev_info(dev, "Partner initialized\n");
                        adapter->from_passive_init = true;
                        /* Discard any stale login responses from prev reset.
                         * CHECK: should we clear even on INIT_COMPLETE?
                         */
                        adapter->login_pending = false;

                        if (adapter->state == VNIC_DOWN)
                                rc = ibmvnic_reset(adapter, VNIC_RESET_PASSIVE_INIT);
                        else
                                rc = ibmvnic_reset(adapter, VNIC_RESET_FAILOVER);

                        if (rc && rc != -EBUSY) {
                                /* We were unable to schedule the failover
                                 * reset either because the adapter was still
                                 * probing (eg: during kexec) or we could not
                                 * allocate memory. Clear the failover_pending
                                 * flag since no one else will. We ignore
                                 * EBUSY because it means either FAILOVER reset
                                 * is already scheduled or the adapter is
                                 * being removed.
                                 */
                                netdev_err(netdev,
                                           "Error %ld scheduling failover reset\n",
                                           rc);
                                adapter->failover_pending = false;
                        }

                        if (!completion_done(&adapter->init_done)) {
                                if (!adapter->init_done_rc)
                                        adapter->init_done_rc = -EAGAIN;
                                complete(&adapter->init_done);
                        }

                        break;
                case IBMVNIC_CRQ_INIT_COMPLETE:
                        dev_info(dev, "Partner initialization complete\n");
                        adapter->crq.active = true;
                        send_version_xchg(adapter);
                        break;
                default:
                        dev_err(dev, "Unknown crq cmd: %d\n", gen_crq->cmd);
                }
                return;
        case IBMVNIC_CRQ_XPORT_EVENT:
                netif_carrier_off(netdev);
                adapter->crq.active = false;
                /* terminate any thread waiting for a response
                 * from the device
                 */
                if (!completion_done(&adapter->fw_done)) {
                        adapter->fw_done_rc = -EIO;
                        complete(&adapter->fw_done);
                }

                /* if we got here during crq-init, retry crq-init */
                if (!completion_done(&adapter->init_done)) {
                        adapter->init_done_rc = -EAGAIN;
                        complete(&adapter->init_done);
                }

                if (!completion_done(&adapter->stats_done))
                        complete(&adapter->stats_done);
                if (test_bit(0, &adapter->resetting))
                        adapter->force_reset_recovery = true;
                if (gen_crq->cmd == IBMVNIC_PARTITION_MIGRATED) {
                        dev_info(dev, "Migrated, re-enabling adapter\n");
                        ibmvnic_reset(adapter, VNIC_RESET_MOBILITY);
                } else if (gen_crq->cmd == IBMVNIC_DEVICE_FAILOVER) {
                        dev_info(dev, "Backing device failover detected\n");
                        adapter->failover_pending = true;
                } else {
                        /* The adapter lost the connection */
                        dev_err(dev, "Virtual Adapter failed (rc=%d)\n",
                                gen_crq->cmd);
                        ibmvnic_reset(adapter, VNIC_RESET_FATAL);
                }
                return;
        case IBMVNIC_CRQ_CMD_RSP:
                break;
        default:
                dev_err(dev, "Got an invalid msg type 0x%02x\n",
                        gen_crq->first);
                return;
        }

        switch (gen_crq->cmd) {
        case VERSION_EXCHANGE_RSP:
                rc = crq->version_exchange_rsp.rc.code;
                if (rc) {
                        dev_err(dev, "Error %ld in VERSION_EXCHG_RSP\n", rc);
                        break;
                }
                ibmvnic_version =
                            be16_to_cpu(crq->version_exchange_rsp.version);
                dev_info(dev, "Partner protocol version is %d\n",
                         ibmvnic_version);
                send_query_cap(adapter);
                break;
        case QUERY_CAPABILITY_RSP:
                handle_query_cap_rsp(crq, adapter);
                break;
        case QUERY_MAP_RSP:
                handle_query_map_rsp(crq, adapter);
                break;
        case REQUEST_MAP_RSP:
                adapter->fw_done_rc = crq->request_map_rsp.rc.code;
                complete(&adapter->fw_done);
                break;
        case REQUEST_UNMAP_RSP:
                handle_request_unmap_rsp(crq, adapter);
                break;
        case REQUEST_CAPABILITY_RSP:
                handle_request_cap_rsp(crq, adapter);
                break;
        case LOGIN_RSP:
                netdev_dbg(netdev, "Got Login Response\n");
                handle_login_rsp(crq, adapter);
                break;
        case LOGICAL_LINK_STATE_RSP:
                netdev_dbg(netdev,
                           "Got Logical Link State Response, state: %d rc: %d\n",
                           crq->logical_link_state_rsp.link_state,
                           crq->logical_link_state_rsp.rc.code);
                adapter->logical_link_state =
                    crq->logical_link_state_rsp.link_state;
                adapter->init_done_rc = crq->logical_link_state_rsp.rc.code;
                complete(&adapter->init_done);
                break;
        case LINK_STATE_INDICATION:
                netdev_dbg(netdev, "Got Logical Link State Indication\n");
                adapter->phys_link_state =
                    crq->link_state_indication.phys_link_state;
                adapter->logical_link_state =
                    crq->link_state_indication.logical_link_state;
                if (adapter->phys_link_state && adapter->logical_link_state)
                        netif_carrier_on(netdev);
                else
                        netif_carrier_off(netdev);
                break;
        case CHANGE_MAC_ADDR_RSP:
                netdev_dbg(netdev, "Got MAC address change Response\n");
                adapter->fw_done_rc = handle_change_mac_rsp(crq, adapter);
                break;
        case ERROR_INDICATION:
                netdev_dbg(netdev, "Got Error Indication\n");
                handle_error_indication(crq, adapter);
                break;
        case REQUEST_STATISTICS_RSP:
                netdev_dbg(netdev, "Got Statistics Response\n");
                complete(&adapter->stats_done);
                break;
        case QUERY_IP_OFFLOAD_RSP:
                netdev_dbg(netdev, "Got Query IP offload Response\n");
                handle_query_ip_offload_rsp(adapter);
                break;
        case MULTICAST_CTRL_RSP:
                netdev_dbg(netdev, "Got multicast control Response\n");
                break;
        case CONTROL_IP_OFFLOAD_RSP:
                netdev_dbg(netdev, "Got Control IP offload Response\n");
                dma_unmap_single(dev, adapter->ip_offload_ctrl_tok,
                                 sizeof(adapter->ip_offload_ctrl),
                                 DMA_TO_DEVICE);
                complete(&adapter->init_done);
                break;
        case COLLECT_FW_TRACE_RSP:
                netdev_dbg(netdev, "Got Collect firmware trace Response\n");
                complete(&adapter->fw_done);
                break;
        case GET_VPD_SIZE_RSP:
                handle_vpd_size_rsp(crq, adapter);
                break;
        case GET_VPD_RSP:
                handle_vpd_rsp(crq, adapter);
                break;
        case QUERY_PHYS_PARMS_RSP:
                adapter->fw_done_rc = handle_query_phys_parms_rsp(crq, adapter);
                complete(&adapter->fw_done);
                break;
        default:
                netdev_err(netdev, "Got an invalid cmd type 0x%02x\n",
                           gen_crq->cmd);
        }
}

static irqreturn_t ibmvnic_interrupt(int irq, void *instance)
{
        struct ibmvnic_adapter *adapter = instance;

        tasklet_schedule(&adapter->tasklet);
        return IRQ_HANDLED;
}

static void ibmvnic_tasklet(struct tasklet_struct *t)
{
        struct ibmvnic_adapter *adapter = from_tasklet(adapter, t, tasklet);
        struct ibmvnic_crq_queue *queue = &adapter->crq;
        union ibmvnic_crq *crq;
        unsigned long flags;

        spin_lock_irqsave(&queue->lock, flags);

        /* Pull all the valid messages off the CRQ */
        while ((crq = ibmvnic_next_crq(adapter)) != NULL) {
                /* This barrier makes sure ibmvnic_next_crq()'s
                 * crq->generic.first & IBMVNIC_CRQ_CMD_RSP is loaded
                 * before ibmvnic_handle_crq()'s
                 * switch(gen_crq->first) and switch(gen_crq->cmd).
                 */
                dma_rmb();
                ibmvnic_handle_crq(crq, adapter);
                crq->generic.first = 0;
        }

        spin_unlock_irqrestore(&queue->lock, flags);
}

static int ibmvnic_reenable_crq_queue(struct ibmvnic_adapter *adapter)
{
        struct vio_dev *vdev = adapter->vdev;
        int rc;

        do {
                rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address);
        } while (rc == H_IN_PROGRESS || rc == H_BUSY || H_IS_LONG_BUSY(rc));

        if (rc)
                dev_err(&vdev->dev, "Error enabling adapter (rc=%d)\n", rc);

        return rc;
}

static int ibmvnic_reset_crq(struct ibmvnic_adapter *adapter)
{
        struct ibmvnic_crq_queue *crq = &adapter->crq;
        struct device *dev = &adapter->vdev->dev;
        struct vio_dev *vdev = adapter->vdev;
        int rc;

        /* Close the CRQ */
        do {
                rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
        } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));

        /* Clean out the queue */
        if (!crq->msgs)
                return -EINVAL;

        memset(crq->msgs, 0, PAGE_SIZE);
        crq->cur = 0;
        crq->active = false;

        /* And re-open it again */
        rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
                                crq->msg_token, PAGE_SIZE);

        if (rc == H_CLOSED)
                /* Adapter is good, but other end is not ready */
                dev_warn(dev, "Partner adapter not ready\n");
        else if (rc != 0)
                dev_warn(dev, "Couldn't register crq (rc=%d)\n", rc);

        return rc;
}

static void release_crq_queue(struct ibmvnic_adapter *adapter)
{
        struct ibmvnic_crq_queue *crq = &adapter->crq;
        struct vio_dev *vdev = adapter->vdev;
        long rc;

        if (!crq->msgs)
                return;

        netdev_dbg(adapter->netdev, "Releasing CRQ\n");
        free_irq(vdev->irq, adapter);
        tasklet_kill(&adapter->tasklet);
        do {
                rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
        } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));

        dma_unmap_single(&vdev->dev, crq->msg_token, PAGE_SIZE,
                         DMA_BIDIRECTIONAL);
        free_page((unsigned long)crq->msgs);
        crq->msgs = NULL;
        crq->active = false;
}

static int init_crq_queue(struct ibmvnic_adapter *adapter)
{
        struct ibmvnic_crq_queue *crq = &adapter->crq;
        struct device *dev = &adapter->vdev->dev;
        struct vio_dev *vdev = adapter->vdev;
        int rc, retrc = -ENOMEM;

        if (crq->msgs)
                return 0;

        crq->msgs = (union ibmvnic_crq *)get_zeroed_page(GFP_KERNEL);
        /* Should we allocate more than one page? */

        if (!crq->msgs)
                return -ENOMEM;

        crq->size = PAGE_SIZE / sizeof(*crq->msgs);
        crq->msg_token = dma_map_single(dev, crq->msgs, PAGE_SIZE,
                                        DMA_BIDIRECTIONAL);
        if (dma_mapping_error(dev, crq->msg_token))
                goto map_failed;

        rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
                                crq->msg_token, PAGE_SIZE);

        if (rc == H_RESOURCE)
                /* maybe kexecing and resource is busy. try a reset */
                rc = ibmvnic_reset_crq(adapter);
        retrc = rc;

        if (rc == H_CLOSED) {
                dev_warn(dev, "Partner adapter not ready\n");
        } else if (rc) {
                dev_warn(dev, "Error %d opening adapter\n", rc);
                goto reg_crq_failed;
        }

        retrc = 0;

        tasklet_setup(&adapter->tasklet, (void *)ibmvnic_tasklet);

        netdev_dbg(adapter->netdev, "registering irq 0x%x\n", vdev->irq);
        snprintf(crq->name, sizeof(crq->name), "ibmvnic-%x",
                 adapter->vdev->unit_address);
        rc = request_irq(vdev->irq, ibmvnic_interrupt, 0, crq->name, adapter);
        if (rc) {
                dev_err(dev, "Couldn't register irq 0x%x. rc=%d\n",
                        vdev->irq, rc);
                goto req_irq_failed;
        }

        rc = vio_enable_interrupts(vdev);
        if (rc) {
                dev_err(dev, "Error %d enabling interrupts\n", rc);
                goto req_irq_failed;
        }

        crq->cur = 0;
        spin_lock_init(&crq->lock);

        /* process any CRQs that were queued before we enabled interrupts */
        tasklet_schedule(&adapter->tasklet);

        return retrc;

req_irq_failed:
        tasklet_kill(&adapter->tasklet);
        do {
                rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
        } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
reg_crq_failed:
        dma_unmap_single(dev, crq->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL);
map_failed:
        free_page((unsigned long)crq->msgs);
        crq->msgs = NULL;
        return retrc;
}

static int ibmvnic_reset_init(struct ibmvnic_adapter *adapter, bool reset)
{
        struct device *dev = &adapter->vdev->dev;
        unsigned long timeout = msecs_to_jiffies(20000);
        u64 old_num_rx_queues = adapter->req_rx_queues;
        u64 old_num_tx_queues = adapter->req_tx_queues;
        int rc;

        adapter->from_passive_init = false;

        rc = ibmvnic_send_crq_init(adapter);
        if (rc) {
                dev_err(dev, "Send crq init failed with error %d\n", rc);
                return rc;
        }

        if (!wait_for_completion_timeout(&adapter->init_done, timeout)) {
                dev_err(dev, "Initialization sequence timed out\n");
                return -ETIMEDOUT;
        }

        if (adapter->init_done_rc) {
                release_crq_queue(adapter);
                dev_err(dev, "CRQ-init failed, %d\n", adapter->init_done_rc);
                return adapter->init_done_rc;
        }

        if (adapter->from_passive_init) {
                adapter->state = VNIC_OPEN;
                adapter->from_passive_init = false;
                dev_err(dev, "CRQ-init failed, passive-init\n");
                return -EINVAL;
        }

        if (reset &&
            test_bit(0, &adapter->resetting) && !adapter->wait_for_reset &&
            adapter->reset_reason != VNIC_RESET_MOBILITY) {
                if (adapter->req_rx_queues != old_num_rx_queues ||
                    adapter->req_tx_queues != old_num_tx_queues) {
                        release_sub_crqs(adapter, 0);
                        rc = init_sub_crqs(adapter);
                } else {
                        /* no need to reinitialize completely, but we do
                         * need to clean up transmits that were in flight
                         * when we processed the reset.  Failure to do so
                         * will confound the upper layer, usually TCP, by
                         * creating the illusion of transmits that are
                         * awaiting completion.
                         */
                        clean_tx_pools(adapter);

                        rc = reset_sub_crq_queues(adapter);
                }
        } else {
                rc = init_sub_crqs(adapter);
        }

        if (rc) {
                dev_err(dev, "Initialization of sub crqs failed\n");
                release_crq_queue(adapter);
                return rc;
        }

        rc = init_sub_crq_irqs(adapter);
        if (rc) {
                dev_err(dev, "Failed to initialize sub crq irqs\n");
                release_crq_queue(adapter);
        }

        return rc;
}

static struct device_attribute dev_attr_failover;

static int ibmvnic_probe(struct vio_dev *dev, const struct vio_device_id *id)
{
        struct ibmvnic_adapter *adapter;
        struct net_device *netdev;
        unsigned char *mac_addr_p;
        unsigned long flags;
        bool init_success;
        int rc;

        dev_dbg(&dev->dev, "entering ibmvnic_probe for UA 0x%x\n",
                dev->unit_address);

        mac_addr_p = (unsigned char *)vio_get_attribute(dev,
                                                        VETH_MAC_ADDR, NULL);
        if (!mac_addr_p) {
                dev_err(&dev->dev,
                        "(%s:%3.3d) ERROR: Can't find MAC_ADDR attribute\n",
                        __FILE__, __LINE__);
                return 0;
        }

        netdev = alloc_etherdev_mq(sizeof(struct ibmvnic_adapter),
                                   IBMVNIC_MAX_QUEUES);
        if (!netdev)
                return -ENOMEM;

        adapter = netdev_priv(netdev);
        adapter->state = VNIC_PROBING;
        dev_set_drvdata(&dev->dev, netdev);
        adapter->vdev = dev;
        adapter->netdev = netdev;
        adapter->login_pending = false;
        memset(&adapter->map_ids, 0, sizeof(adapter->map_ids));
        /* map_ids start at 1, so ensure map_id 0 is always "in-use" */
        bitmap_set(adapter->map_ids, 0, 1);

        ether_addr_copy(adapter->mac_addr, mac_addr_p);
        eth_hw_addr_set(netdev, adapter->mac_addr);
        netdev->irq = dev->irq;
        netdev->netdev_ops = &ibmvnic_netdev_ops;
        netdev->ethtool_ops = &ibmvnic_ethtool_ops;
        SET_NETDEV_DEV(netdev, &dev->dev);

        INIT_WORK(&adapter->ibmvnic_reset, __ibmvnic_reset);
        INIT_DELAYED_WORK(&adapter->ibmvnic_delayed_reset,
                          __ibmvnic_delayed_reset);
        INIT_LIST_HEAD(&adapter->rwi_list);
        spin_lock_init(&adapter->rwi_lock);
        spin_lock_init(&adapter->state_lock);
        mutex_init(&adapter->fw_lock);
        init_completion(&adapter->probe_done);
        init_completion(&adapter->init_done);
        init_completion(&adapter->fw_done);
        init_completion(&adapter->reset_done);
        init_completion(&adapter->stats_done);
        clear_bit(0, &adapter->resetting);
        adapter->prev_rx_buf_sz = 0;
        adapter->prev_mtu = 0;

        init_success = false;
        do {
                reinit_init_done(adapter);

                /* clear any failovers we got in the previous pass
                 * since we are reinitializing the CRQ
                 */
                adapter->failover_pending = false;

                /* If we had already initialized CRQ, we may have one or
                 * more resets queued already. Discard those and release
                 * the CRQ before initializing the CRQ again.
                 */
                release_crq_queue(adapter);

                /* Since we are still in PROBING state, __ibmvnic_reset()
                 * will not access the ->rwi_list and since we released CRQ,
                 * we won't get _new_ transport events. But there maybe an
                 * ongoing ibmvnic_reset() call. So serialize access to
                 * rwi_list. If we win the race, ibvmnic_reset() could add
                 * a reset after we purged but thats ok - we just may end
                 * up with an extra reset (i.e similar to having two or more
                 * resets in the queue at once).
                 * CHECK.
                 */
                spin_lock_irqsave(&adapter->rwi_lock, flags);
                flush_reset_queue(adapter);
                spin_unlock_irqrestore(&adapter->rwi_lock, flags);

                rc = init_crq_queue(adapter);
                if (rc) {
                        dev_err(&dev->dev, "Couldn't initialize crq. rc=%d\n",
                                rc);
                        goto ibmvnic_init_fail;
                }

                rc = ibmvnic_reset_init(adapter, false);
        } while (rc == -EAGAIN);

        /* We are ignoring the error from ibmvnic_reset_init() assuming that the
         * partner is not ready. CRQ is not active. When the partner becomes
         * ready, we will do the passive init reset.
         */

        if (!rc)
                init_success = true;

        rc = init_stats_buffers(adapter);
        if (rc)
                goto ibmvnic_init_fail;

        rc = init_stats_token(adapter);
        if (rc)
                goto ibmvnic_stats_fail;

        rc = device_create_file(&dev->dev, &dev_attr_failover);
        if (rc)
                goto ibmvnic_dev_file_err;

        netif_carrier_off(netdev);

        if (init_success) {
                adapter->state = VNIC_PROBED;
                netdev->mtu = adapter->req_mtu - ETH_HLEN;
                netdev->min_mtu = adapter->min_mtu - ETH_HLEN;
                netdev->max_mtu = adapter->max_mtu - ETH_HLEN;
        } else {
                adapter->state = VNIC_DOWN;
        }

        adapter->wait_for_reset = false;
        adapter->last_reset_time = jiffies;

        rc = register_netdev(netdev);
        if (rc) {
                dev_err(&dev->dev, "failed to register netdev rc=%d\n", rc);
                goto ibmvnic_register_fail;
        }
        dev_info(&dev->dev, "ibmvnic registered\n");

        rc = ibmvnic_cpu_notif_add(adapter);
        if (rc) {
                netdev_err(netdev, "Registering cpu notifier failed\n");
                goto cpu_notif_add_failed;
        }

        complete(&adapter->probe_done);

        return 0;

cpu_notif_add_failed:
        unregister_netdev(netdev);

ibmvnic_register_fail:
        device_remove_file(&dev->dev, &dev_attr_failover);

ibmvnic_dev_file_err:
        release_stats_token(adapter);

ibmvnic_stats_fail:
        release_stats_buffers(adapter);

ibmvnic_init_fail:
        release_sub_crqs(adapter, 1);
        release_crq_queue(adapter);

        /* cleanup worker thread after releasing CRQ so we don't get
         * transport events (i.e new work items for the worker thread).
         */
        adapter->state = VNIC_REMOVING;
        complete(&adapter->probe_done);
        flush_work(&adapter->ibmvnic_reset);
        flush_delayed_work(&adapter->ibmvnic_delayed_reset);

        flush_reset_queue(adapter);

        mutex_destroy(&adapter->fw_lock);
        free_netdev(netdev);

        return rc;
}

static void ibmvnic_remove(struct vio_dev *dev)
{
        struct net_device *netdev = dev_get_drvdata(&dev->dev);
        struct ibmvnic_adapter *adapter = netdev_priv(netdev);
        unsigned long flags;

        spin_lock_irqsave(&adapter->state_lock, flags);

        /* If ibmvnic_reset() is scheduling a reset, wait for it to
         * finish. Then, set the state to REMOVING to prevent it from
         * scheduling any more work and to have reset functions ignore
         * any resets that have already been scheduled. Drop the lock
         * after setting state, so __ibmvnic_reset() which is called
         * from the flush_work() below, can make progress.
         */
        spin_lock(&adapter->rwi_lock);
        adapter->state = VNIC_REMOVING;
        spin_unlock(&adapter->rwi_lock);

        spin_unlock_irqrestore(&adapter->state_lock, flags);

        ibmvnic_cpu_notif_remove(adapter);

        flush_work(&adapter->ibmvnic_reset);
        flush_delayed_work(&adapter->ibmvnic_delayed_reset);

        rtnl_lock();
        unregister_netdevice(netdev);

        release_resources(adapter);
        release_rx_pools(adapter);
        release_tx_pools(adapter);
        release_sub_crqs(adapter, 1);
        release_crq_queue(adapter);

        release_stats_token(adapter);
        release_stats_buffers(adapter);

        adapter->state = VNIC_REMOVED;

        rtnl_unlock();
        mutex_destroy(&adapter->fw_lock);
        device_remove_file(&dev->dev, &dev_attr_failover);
        free_netdev(netdev);
        dev_set_drvdata(&dev->dev, NULL);
}

static ssize_t failover_store(struct device *dev, struct device_attribute *attr,
                              const char *buf, size_t count)
{
        struct net_device *netdev = dev_get_drvdata(dev);
        struct ibmvnic_adapter *adapter = netdev_priv(netdev);
        unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
        __be64 session_token;
        long rc;

        if (!sysfs_streq(buf, "1"))
                return -EINVAL;

        rc = plpar_hcall(H_VIOCTL, retbuf, adapter->vdev->unit_address,
                         H_GET_SESSION_TOKEN, 0, 0, 0);
        if (rc) {
                netdev_err(netdev, "Couldn't retrieve session token, rc %ld\n",
                           rc);
                goto last_resort;
        }

        session_token = (__be64)retbuf[0];
        netdev_dbg(netdev, "Initiating client failover, session id %llx\n",
                   be64_to_cpu(session_token));
        rc = plpar_hcall_norets(H_VIOCTL, adapter->vdev->unit_address,
                                H_SESSION_ERR_DETECTED, session_token, 0, 0);
        if (rc) {
                netdev_err(netdev,
                           "H_VIOCTL initiated failover failed, rc %ld\n",
                           rc);
                goto last_resort;
        }

        return count;

last_resort:
        netdev_dbg(netdev, "Trying to send CRQ_CMD, the last resort\n");
        ibmvnic_reset(adapter, VNIC_RESET_FAILOVER);

        return count;
}
static DEVICE_ATTR_WO(failover);

static unsigned long ibmvnic_get_desired_dma(struct vio_dev *vdev)
{
        struct net_device *netdev = dev_get_drvdata(&vdev->dev);
        struct ibmvnic_adapter *adapter;
        struct iommu_table *tbl;
        unsigned long ret = 0;
        int i;

        tbl = get_iommu_table_base(&vdev->dev);

        /* netdev inits at probe time along with the structures we need below*/
        if (!netdev)
                return IOMMU_PAGE_ALIGN(IBMVNIC_IO_ENTITLEMENT_DEFAULT, tbl);

        adapter = netdev_priv(netdev);

        ret += PAGE_SIZE; /* the crq message queue */
        ret += IOMMU_PAGE_ALIGN(sizeof(struct ibmvnic_statistics), tbl);

        for (i = 0; i < adapter->req_tx_queues + adapter->req_rx_queues; i++)
                ret += 4 * PAGE_SIZE; /* the scrq message queue */

        for (i = 0; i < adapter->num_active_rx_pools; i++)
                ret += adapter->rx_pool[i].size *
                    IOMMU_PAGE_ALIGN(adapter->rx_pool[i].buff_size, tbl);

        return ret;
}

static int ibmvnic_resume(struct device *dev)
{
        struct net_device *netdev = dev_get_drvdata(dev);
        struct ibmvnic_adapter *adapter = netdev_priv(netdev);

        if (adapter->state != VNIC_OPEN)
                return 0;

        tasklet_schedule(&adapter->tasklet);

        return 0;
}

static const struct vio_device_id ibmvnic_device_table[] = {
        {"network", "IBM,vnic"},
        {"", "" }
};
MODULE_DEVICE_TABLE(vio, ibmvnic_device_table);

static const struct dev_pm_ops ibmvnic_pm_ops = {
        .resume = ibmvnic_resume
};

static struct vio_driver ibmvnic_driver = {
        .id_table       = ibmvnic_device_table,
        .probe          = ibmvnic_probe,
        .remove         = ibmvnic_remove,
        .get_desired_dma = ibmvnic_get_desired_dma,
        .name           = ibmvnic_driver_name,
        .pm             = &ibmvnic_pm_ops,
};

/* module functions */
static int __init ibmvnic_module_init(void)
{
        int ret;

        ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "net/ibmvnic:online",
                                      ibmvnic_cpu_online,
                                      ibmvnic_cpu_down_prep);
        if (ret < 0)
                goto out;
        ibmvnic_online = ret;
        ret = cpuhp_setup_state_multi(CPUHP_IBMVNIC_DEAD, "net/ibmvnic:dead",
                                      NULL, ibmvnic_cpu_dead);
        if (ret)
                goto err_dead;

        ret = vio_register_driver(&ibmvnic_driver);
        if (ret)
                goto err_vio_register;

        pr_info("%s: %s %s\n", ibmvnic_driver_name, ibmvnic_driver_string,
                IBMVNIC_DRIVER_VERSION);

        return 0;
err_vio_register:
        cpuhp_remove_multi_state(CPUHP_IBMVNIC_DEAD);
err_dead:
        cpuhp_remove_multi_state(ibmvnic_online);
out:
        return ret;
}

static void __exit ibmvnic_module_exit(void)
{
        vio_unregister_driver(&ibmvnic_driver);
        cpuhp_remove_multi_state(CPUHP_IBMVNIC_DEAD);
        cpuhp_remove_multi_state(ibmvnic_online);
}

module_init(ibmvnic_module_init);
module_exit(ibmvnic_module_exit);