[linux.git] / net / smc / smc_ism.c

// SPDX-License-Identifier: GPL-2.0
/* Shared Memory Communications Direct over ISM devices (SMC-D)
 *
 * Functions for ISM device.
 *
 * Copyright IBM Corp. 2018
 */

#include <linux/spinlock.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <asm/page.h>

#include "smc.h"
#include "smc_core.h"
#include "smc_ism.h"
#include "smc_pnet.h"
#include "smc_netlink.h"

struct smcd_dev_list smcd_dev_list = {
	.list = LIST_HEAD_INIT(smcd_dev_list.list),
	.mutex = __MUTEX_INITIALIZER(smcd_dev_list.mutex)
};

static bool smc_ism_v2_capable;

/* Test if an ISM communication is possible - same CPC */
int smc_ism_cantalk(u64 peer_gid, unsigned short vlan_id, struct smcd_dev *smcd)
{
	return smcd->ops->query_remote_gid(smcd, peer_gid, vlan_id ? 1 : 0,
					   vlan_id);
}

int smc_ism_write(struct smcd_dev *smcd, const struct smc_ism_position *pos,
		  void *data, size_t len)
{
	int rc;

	rc = smcd->ops->move_data(smcd, pos->token, pos->index, pos->signal,
				  pos->offset, data, len);

	return rc < 0 ? rc : 0;
}

void smc_ism_get_system_eid(struct smcd_dev *smcd, u8 **eid)
{
	smcd->ops->get_system_eid(smcd, eid);
}

u16 smc_ism_get_chid(struct smcd_dev *smcd)
{
	return smcd->ops->get_chid(smcd);
}

/* HW supports ISM V2 and thus System EID is defined */
bool smc_ism_is_v2_capable(void)
{
	return smc_ism_v2_capable;
}

/* Set a connection using this DMBE. */
void smc_ism_set_conn(struct smc_connection *conn)
{
	unsigned long flags;

	spin_lock_irqsave(&conn->lgr->smcd->lock, flags);
	conn->lgr->smcd->conn[conn->rmb_desc->sba_idx] = conn;
	spin_unlock_irqrestore(&conn->lgr->smcd->lock, flags);
}

/* Unset a connection using this DMBE. */
void smc_ism_unset_conn(struct smc_connection *conn)
{
	unsigned long flags;

	if (!conn->rmb_desc)
		return;

	spin_lock_irqsave(&conn->lgr->smcd->lock, flags);
	conn->lgr->smcd->conn[conn->rmb_desc->sba_idx] = NULL;
	spin_unlock_irqrestore(&conn->lgr->smcd->lock, flags);
}

/* Register a VLAN identifier with the ISM device. Use a reference count
 * and add a VLAN identifier only when the first DMB using this VLAN is
 * registered.
 */
int smc_ism_get_vlan(struct smcd_dev *smcd, unsigned short vlanid)
{
	struct smc_ism_vlanid *new_vlan, *vlan;
	unsigned long flags;
	int rc = 0;

	if (!vlanid)			/* No valid vlan id */
		return -EINVAL;

	/* create new vlan entry, in case we need it */
	new_vlan = kzalloc(sizeof(*new_vlan), GFP_KERNEL);
	if (!new_vlan)
		return -ENOMEM;
	new_vlan->vlanid = vlanid;
	refcount_set(&new_vlan->refcnt, 1);

	/* if there is an existing entry, increase count and return */
	spin_lock_irqsave(&smcd->lock, flags);
	list_for_each_entry(vlan, &smcd->vlan, list) {
		if (vlan->vlanid == vlanid) {
			refcount_inc(&vlan->refcnt);
			kfree(new_vlan);
			goto out;
		}
	}

	/* no existing entry found.
	 * add new entry to device; might fail, e.g., if HW limit reached
	 */
	if (smcd->ops->add_vlan_id(smcd, vlanid)) {
		kfree(new_vlan);
		rc = -EIO;
		goto out;
	}
	list_add_tail(&new_vlan->list, &smcd->vlan);
out:
	spin_unlock_irqrestore(&smcd->lock, flags);
	return rc;
}

/* Unregister a VLAN identifier with the ISM device. Use a reference count
 * and remove a VLAN identifier only when the last DMB using this VLAN is
 * unregistered.
 */
int smc_ism_put_vlan(struct smcd_dev *smcd, unsigned short vlanid)
{
	struct smc_ism_vlanid *vlan;
	unsigned long flags;
	bool found = false;
	int rc = 0;

	if (!vlanid)			/* No valid vlan id */
		return -EINVAL;

	spin_lock_irqsave(&smcd->lock, flags);
	list_for_each_entry(vlan, &smcd->vlan, list) {
		if (vlan->vlanid == vlanid) {
			if (!refcount_dec_and_test(&vlan->refcnt))
				goto out;
			found = true;
			break;
		}
	}
	if (!found) {
		rc = -ENOENT;
		goto out;		/* VLAN id not in table */
	}

	/* Found and the last reference just gone */
	if (smcd->ops->del_vlan_id(smcd, vlanid))
		rc = -EIO;
	list_del(&vlan->list);
	kfree(vlan);
out:
	spin_unlock_irqrestore(&smcd->lock, flags);
	return rc;
}

int smc_ism_unregister_dmb(struct smcd_dev *smcd, struct smc_buf_desc *dmb_desc)
{
	struct smcd_dmb dmb;
	int rc = 0;

	if (!dmb_desc->dma_addr)
		return rc;

	memset(&dmb, 0, sizeof(dmb));
	dmb.dmb_tok = dmb_desc->token;
	dmb.sba_idx = dmb_desc->sba_idx;
	dmb.cpu_addr = dmb_desc->cpu_addr;
	dmb.dma_addr = dmb_desc->dma_addr;
	dmb.dmb_len = dmb_desc->len;
	rc = smcd->ops->unregister_dmb(smcd, &dmb);
	if (!rc || rc == ISM_ERROR) {
		dmb_desc->cpu_addr = NULL;
		dmb_desc->dma_addr = 0;
	}

	return rc;
}

int smc_ism_register_dmb(struct smc_link_group *lgr, int dmb_len,
			 struct smc_buf_desc *dmb_desc)
{
	struct smcd_dmb dmb;
	int rc;

	memset(&dmb, 0, sizeof(dmb));
	dmb.dmb_len = dmb_len;
	dmb.sba_idx = dmb_desc->sba_idx;
	dmb.vlan_id = lgr->vlan_id;
	dmb.rgid = lgr->peer_gid;
	rc = lgr->smcd->ops->register_dmb(lgr->smcd, &dmb);
	if (!rc) {
		dmb_desc->sba_idx = dmb.sba_idx;
		dmb_desc->token = dmb.dmb_tok;
		dmb_desc->cpu_addr = dmb.cpu_addr;
		dmb_desc->dma_addr = dmb.dma_addr;
		dmb_desc->len = dmb.dmb_len;
	}
	return rc;
}

static int smc_nl_handle_smcd_dev(struct smcd_dev *smcd,
				  struct sk_buff *skb,
				  struct netlink_callback *cb)
{
	char smc_pnet[SMC_MAX_PNETID_LEN + 1];
	struct smc_pci_dev smc_pci_dev;
	struct nlattr *port_attrs;
	struct nlattr *attrs;
	int use_cnt = 0;
	void *nlh;

	nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
			  &smc_gen_nl_family, NLM_F_MULTI,
			  SMC_NETLINK_GET_DEV_SMCD);
	if (!nlh)
		goto errmsg;
	attrs = nla_nest_start(skb, SMC_GEN_DEV_SMCD);
	if (!attrs)
		goto errout;
	use_cnt = atomic_read(&smcd->lgr_cnt);
	if (nla_put_u32(skb, SMC_NLA_DEV_USE_CNT, use_cnt))
		goto errattr;
	if (nla_put_u8(skb, SMC_NLA_DEV_IS_CRIT, use_cnt > 0))
		goto errattr;
	memset(&smc_pci_dev, 0, sizeof(smc_pci_dev));
	smc_set_pci_values(to_pci_dev(smcd->dev.parent), &smc_pci_dev);
	if (nla_put_u32(skb, SMC_NLA_DEV_PCI_FID, smc_pci_dev.pci_fid))
		goto errattr;
	if (nla_put_u16(skb, SMC_NLA_DEV_PCI_CHID, smc_pci_dev.pci_pchid))
		goto errattr;
	if (nla_put_u16(skb, SMC_NLA_DEV_PCI_VENDOR, smc_pci_dev.pci_vendor))
		goto errattr;
	if (nla_put_u16(skb, SMC_NLA_DEV_PCI_DEVICE, smc_pci_dev.pci_device))
		goto errattr;
	if (nla_put_string(skb, SMC_NLA_DEV_PCI_ID, smc_pci_dev.pci_id))
		goto errattr;

	port_attrs = nla_nest_start(skb, SMC_NLA_DEV_PORT);
	if (!port_attrs)
		goto errattr;
	if (nla_put_u8(skb, SMC_NLA_DEV_PORT_PNET_USR, smcd->pnetid_by_user))
		goto errportattr;
	memcpy(smc_pnet, smcd->pnetid, SMC_MAX_PNETID_LEN);
	smc_pnet[SMC_MAX_PNETID_LEN] = 0;
	if (nla_put_string(skb, SMC_NLA_DEV_PORT_PNETID, smc_pnet))
		goto errportattr;

	nla_nest_end(skb, port_attrs);
	nla_nest_end(skb, attrs);
	genlmsg_end(skb, nlh);
	return 0;

errportattr:
	nla_nest_cancel(skb, port_attrs);
errattr:
	nla_nest_cancel(skb, attrs);
errout:
	nlmsg_cancel(skb, nlh);
errmsg:
	return -EMSGSIZE;
}

static void smc_nl_prep_smcd_dev(struct smcd_dev_list *dev_list,
				 struct sk_buff *skb,
				 struct netlink_callback *cb)
{
	struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
	int snum = cb_ctx->pos[0];
	struct smcd_dev *smcd;
	int num = 0;

	mutex_lock(&dev_list->mutex);
	list_for_each_entry(smcd, &dev_list->list, list) {
		if (num < snum)
			goto next;
		if (smc_nl_handle_smcd_dev(smcd, skb, cb))
			goto errout;
next:
		num++;
	}
errout:
	mutex_unlock(&dev_list->mutex);
	cb_ctx->pos[0] = num;
}

int smcd_nl_get_device(struct sk_buff *skb, struct netlink_callback *cb)
{
	smc_nl_prep_smcd_dev(&smcd_dev_list, skb, cb);
	return skb->len;
}

struct smc_ism_event_work {
	struct work_struct work;
	struct smcd_dev *smcd;
	struct smcd_event event;
};

#define ISM_EVENT_REQUEST		0x0001
#define ISM_EVENT_RESPONSE		0x0002
#define ISM_EVENT_REQUEST_IR		0x00000001
#define ISM_EVENT_CODE_SHUTDOWN		0x80
#define ISM_EVENT_CODE_TESTLINK		0x83

union smcd_sw_event_info {
	u64	info;
	struct {
		u8		uid[SMC_LGR_ID_SIZE];
		unsigned short	vlan_id;
		u16		code;
	};
};

static void smcd_handle_sw_event(struct smc_ism_event_work *wrk)
{
	union smcd_sw_event_info ev_info;

	ev_info.info = wrk->event.info;
	switch (wrk->event.code) {
	case ISM_EVENT_CODE_SHUTDOWN:	/* Peer shut down DMBs */
		smc_smcd_terminate(wrk->smcd, wrk->event.tok, ev_info.vlan_id);
		break;
	case ISM_EVENT_CODE_TESTLINK:	/* Activity timer */
		if (ev_info.code == ISM_EVENT_REQUEST) {
			ev_info.code = ISM_EVENT_RESPONSE;
			wrk->smcd->ops->signal_event(wrk->smcd,
						     wrk->event.tok,
						     ISM_EVENT_REQUEST_IR,
						     ISM_EVENT_CODE_TESTLINK,
						     ev_info.info);
			}
		break;
	}
}

int smc_ism_signal_shutdown(struct smc_link_group *lgr)
{
	int rc;
	union smcd_sw_event_info ev_info;

	if (lgr->peer_shutdown)
		return 0;

	memcpy(ev_info.uid, lgr->id, SMC_LGR_ID_SIZE);
	ev_info.vlan_id = lgr->vlan_id;
	ev_info.code = ISM_EVENT_REQUEST;
	rc = lgr->smcd->ops->signal_event(lgr->smcd, lgr->peer_gid,
					  ISM_EVENT_REQUEST_IR,
					  ISM_EVENT_CODE_SHUTDOWN,
					  ev_info.info);
	return rc;
}

/* worker for SMC-D events */
static void smc_ism_event_work(struct work_struct *work)
{
	struct smc_ism_event_work *wrk =
		container_of(work, struct smc_ism_event_work, work);

	switch (wrk->event.type) {
	case ISM_EVENT_GID:	/* GID event, token is peer GID */
		smc_smcd_terminate(wrk->smcd, wrk->event.tok, VLAN_VID_MASK);
		break;
	case ISM_EVENT_DMB:
		break;
	case ISM_EVENT_SWR:	/* Software defined event */
		smcd_handle_sw_event(wrk);
		break;
	}
	kfree(wrk);
}

static void smcd_release(struct device *dev)
{
	struct smcd_dev *smcd = container_of(dev, struct smcd_dev, dev);

	kfree(smcd->conn);
	kfree(smcd);
}

struct smcd_dev *smcd_alloc_dev(struct device *parent, const char *name,
				const struct smcd_ops *ops, int max_dmbs)
{
	struct smcd_dev *smcd;

	smcd = kzalloc(sizeof(*smcd), GFP_KERNEL);
	if (!smcd)
		return NULL;
	smcd->conn = kcalloc(max_dmbs, sizeof(struct smc_connection *),
			     GFP_KERNEL);
	if (!smcd->conn) {
		kfree(smcd);
		return NULL;
	}

	smcd->dev.parent = parent;
	smcd->dev.release = smcd_release;
	device_initialize(&smcd->dev);
	dev_set_name(&smcd->dev, name);
	smcd->ops = ops;
	if (smc_pnetid_by_dev_port(parent, 0, smcd->pnetid))
		smc_pnetid_by_table_smcd(smcd);

	spin_lock_init(&smcd->lock);
	spin_lock_init(&smcd->lgr_lock);
	INIT_LIST_HEAD(&smcd->vlan);
	INIT_LIST_HEAD(&smcd->lgr_list);
	init_waitqueue_head(&smcd->lgrs_deleted);
	smcd->event_wq = alloc_ordered_workqueue("ism_evt_wq-%s)",
						 WQ_MEM_RECLAIM, name);
	if (!smcd->event_wq) {
		kfree(smcd->conn);
		kfree(smcd);
		return NULL;
	}
	return smcd;
}
EXPORT_SYMBOL_GPL(smcd_alloc_dev);

int smcd_register_dev(struct smcd_dev *smcd)
{
	mutex_lock(&smcd_dev_list.mutex);
	if (list_empty(&smcd_dev_list.list)) {
		u8 *system_eid = NULL;

		smc_ism_get_system_eid(smcd, &system_eid);
		if (system_eid[24] != '0' || system_eid[28] != '0')
			smc_ism_v2_capable = true;
	}
	/* sort list: devices without pnetid before devices with pnetid */
	if (smcd->pnetid[0])
		list_add_tail(&smcd->list, &smcd_dev_list.list);
	else
		list_add(&smcd->list, &smcd_dev_list.list);
	mutex_unlock(&smcd_dev_list.mutex);

	pr_warn_ratelimited("smc: adding smcd device %s with pnetid %.16s%s\n",
			    dev_name(&smcd->dev), smcd->pnetid,
			    smcd->pnetid_by_user ? " (user defined)" : "");

	return device_add(&smcd->dev);
}
EXPORT_SYMBOL_GPL(smcd_register_dev);

void smcd_unregister_dev(struct smcd_dev *smcd)
{
	pr_warn_ratelimited("smc: removing smcd device %s\n",
			    dev_name(&smcd->dev));
	mutex_lock(&smcd_dev_list.mutex);
	list_del_init(&smcd->list);
	mutex_unlock(&smcd_dev_list.mutex);
	smcd->going_away = 1;
	smc_smcd_terminate_all(smcd);
	flush_workqueue(smcd->event_wq);
	destroy_workqueue(smcd->event_wq);

	device_del(&smcd->dev);
}
EXPORT_SYMBOL_GPL(smcd_unregister_dev);

void smcd_free_dev(struct smcd_dev *smcd)
{
	put_device(&smcd->dev);
}
EXPORT_SYMBOL_GPL(smcd_free_dev);

/* SMCD Device event handler. Called from ISM device interrupt handler.
 * Parameters are smcd device pointer,
 * - event->type (0 --> DMB, 1 --> GID),
 * - event->code (event code),
 * - event->tok (either DMB token when event type 0, or GID when event type 1)
 * - event->time (time of day)
 * - event->info (debug info).
 *
 * Context:
 * - Function called in IRQ context from ISM device driver event handler.
 */
void smcd_handle_event(struct smcd_dev *smcd, struct smcd_event *event)
{
	struct smc_ism_event_work *wrk;

	if (smcd->going_away)
		return;
	/* copy event to event work queue, and let it be handled there */
	wrk = kmalloc(sizeof(*wrk), GFP_ATOMIC);
	if (!wrk)
		return;
	INIT_WORK(&wrk->work, smc_ism_event_work);
	wrk->smcd = smcd;
	wrk->event = *event;
	queue_work(smcd->event_wq, &wrk->work);
}
EXPORT_SYMBOL_GPL(smcd_handle_event);

/* SMCD Device interrupt handler. Called from ISM device interrupt handler.
 * Parameters are smcd device pointer and DMB number. Find the connection and
 * schedule the tasklet for this connection.
 *
 * Context:
 * - Function called in IRQ context from ISM device driver IRQ handler.
 */
void smcd_handle_irq(struct smcd_dev *smcd, unsigned int dmbno)
{
	struct smc_connection *conn = NULL;
	unsigned long flags;

	spin_lock_irqsave(&smcd->lock, flags);
	conn = smcd->conn[dmbno];
	if (conn && !conn->killed)
		tasklet_schedule(&conn->rx_tsklet);
	spin_unlock_irqrestore(&smcd->lock, flags);
}
EXPORT_SYMBOL_GPL(smcd_handle_irq);

void __init smc_ism_init(void)
{
	smc_ism_v2_capable = false;
}
Commit	Line	Data
c6ba7c9b HW	1	// SPDX-License-Identifier: GPL-2.0
	2	/* Shared Memory Communications Direct over ISM devices (SMC-D)
	3	*
	4	* Functions for ISM device.
	5	*
	6	* Copyright IBM Corp. 2018
	7	*/
	8
	9	#include <linux/spinlock.h>
82087c03	10	#include <linux/mutex.h>
c6ba7c9b HW	11	#include <linux/slab.h>
	12	#include <asm/page.h>
	13
	14	#include "smc.h"
	15	#include "smc_core.h"
	16	#include "smc_ism.h"
1619f770	17	#include "smc_pnet.h"
aaf95523	18	#include "smc_netlink.h"
c6ba7c9b HW	19
	20	struct smcd_dev_list smcd_dev_list = {
	21	.list = LIST_HEAD_INIT(smcd_dev_list.list),
82087c03	22	.mutex = __MUTEX_INITIALIZER(smcd_dev_list.mutex)
c6ba7c9b HW	23	};
c6ba7c9b HW	24
49407ae2	25	static bool smc_ism_v2_capable;
201091eb UB	26
201091eb UB	27	/* Test if an ISM communication is possible - same CPC */
c6ba7c9b HW	28	int smc_ism_cantalk(u64 peer_gid, unsigned short vlan_id, struct smcd_dev *smcd)
	29	{
	30	return smcd->ops->query_remote_gid(smcd, peer_gid, vlan_id ? 1 : 0,
	31	vlan_id);
	32	}
	33
	34	int smc_ism_write(struct smcd_dev smcd, const struct smc_ism_position pos,
	35	void *data, size_t len)
	36	{
	37	int rc;
	38
	39	rc = smcd->ops->move_data(smcd, pos->token, pos->index, pos->signal,
	40	pos->offset, data, len);
	41
	42	return rc < 0 ? rc : 0;
	43	}
	44
201091eb UB	45	void smc_ism_get_system_eid(struct smcd_dev smcd, u8 *eid)
	46	{
	47	smcd->ops->get_system_eid(smcd, eid);
	48	}
	49
8caaccf5 UB	50	u16 smc_ism_get_chid(struct smcd_dev *smcd)
	51	{
	52	return smcd->ops->get_chid(smcd);
	53	}
	54
49407ae2 GG	55	/* HW supports ISM V2 and thus System EID is defined */
	56	bool smc_ism_is_v2_capable(void)
	57	{
	58	return smc_ism_v2_capable;
	59	}
	60
c6ba7c9b HW	61	/* Set a connection using this DMBE. */
	62	void smc_ism_set_conn(struct smc_connection *conn)
	63	{
	64	unsigned long flags;
	65
	66	spin_lock_irqsave(&conn->lgr->smcd->lock, flags);
	67	conn->lgr->smcd->conn[conn->rmb_desc->sba_idx] = conn;
	68	spin_unlock_irqrestore(&conn->lgr->smcd->lock, flags);
	69	}
	70
	71	/* Unset a connection using this DMBE. */
	72	void smc_ism_unset_conn(struct smc_connection *conn)
	73	{
	74	unsigned long flags;
	75
	76	if (!conn->rmb_desc)
	77	return;
	78
	79	spin_lock_irqsave(&conn->lgr->smcd->lock, flags);
	80	conn->lgr->smcd->conn[conn->rmb_desc->sba_idx] = NULL;
	81	spin_unlock_irqrestore(&conn->lgr->smcd->lock, flags);
	82	}
	83
	84	/* Register a VLAN identifier with the ISM device. Use a reference count
	85	* and add a VLAN identifier only when the first DMB using this VLAN is
	86	* registered.
	87	*/
	88	int smc_ism_get_vlan(struct smcd_dev *smcd, unsigned short vlanid)
	89	{
	90	struct smc_ism_vlanid new_vlan, vlan;
	91	unsigned long flags;
	92	int rc = 0;
	93
	94	if (!vlanid) /* No valid vlan id */
	95	return -EINVAL;
	96
	97	/* create new vlan entry, in case we need it */
	98	new_vlan = kzalloc(sizeof(*new_vlan), GFP_KERNEL);
	99	if (!new_vlan)
	100	return -ENOMEM;
	101	new_vlan->vlanid = vlanid;
	102	refcount_set(&new_vlan->refcnt, 1);
	103
	104	/* if there is an existing entry, increase count and return */
	105	spin_lock_irqsave(&smcd->lock, flags);
	106	list_for_each_entry(vlan, &smcd->vlan, list) {
	107	if (vlan->vlanid == vlanid) {
	108	refcount_inc(&vlan->refcnt);
	109	kfree(new_vlan);
	110	goto out;
	111	}
	112	}
	113
	114	/* no existing entry found.
	115	* add new entry to device; might fail, e.g., if HW limit reached
	116	*/
	117	if (smcd->ops->add_vlan_id(smcd, vlanid)) {
	118	kfree(new_vlan);
	119	rc = -EIO;
	120	goto out;
	121	}
	122	list_add_tail(&new_vlan->list, &smcd->vlan);
	123	out:
	124	spin_unlock_irqrestore(&smcd->lock, flags);
125	return rc;
126	}
127
128	/* Unregister a VLAN identifier with the ISM device. Use a reference count
129	* and remove a VLAN identifier only when the last DMB using this VLAN is
130	* unregistered.
131	*/
132	int smc_ism_put_vlan(struct smcd_dev *smcd, unsigned short vlanid)
133	{
134	struct smc_ism_vlanid *vlan;
135	unsigned long flags;
136	bool found = false;
137	int rc = 0;
138
139	if (!vlanid) /* No valid vlan id */
140	return -EINVAL;
141
142	spin_lock_irqsave(&smcd->lock, flags);
143	list_for_each_entry(vlan, &smcd->vlan, list) {
144	if (vlan->vlanid == vlanid) {
145	if (!refcount_dec_and_test(&vlan->refcnt))
146	goto out;
147	found = true;
148	break;
149	}
150	}
151	if (!found) {
152	rc = -ENOENT;
153	goto out; /* VLAN id not in table */
154	}
155
156	/* Found and the last reference just gone */
157	if (smcd->ops->del_vlan_id(smcd, vlanid))
158	rc = -EIO;
159	list_del(&vlan->list);
160	kfree(vlan);
161	out:
162	spin_unlock_irqrestore(&smcd->lock, flags);
163	return rc;
164	}
165
166	int smc_ism_unregister_dmb(struct smcd_dev smcd, struct smc_buf_desc dmb_desc)
167	{
168	struct smcd_dmb dmb;
42bfba9e UB	169	int rc = 0;
	170
	171	if (!dmb_desc->dma_addr)
	172	return rc;
c6ba7c9b HW	173
	174	memset(&dmb, 0, sizeof(dmb));
	175	dmb.dmb_tok = dmb_desc->token;
	176	dmb.sba_idx = dmb_desc->sba_idx;
	177	dmb.cpu_addr = dmb_desc->cpu_addr;
	178	dmb.dma_addr = dmb_desc->dma_addr;
	179	dmb.dmb_len = dmb_desc->len;
42bfba9e UB	180	rc = smcd->ops->unregister_dmb(smcd, &dmb);
	181	if (!rc \|\| rc == ISM_ERROR) {
	182	dmb_desc->cpu_addr = NULL;
	183	dmb_desc->dma_addr = 0;
	184	}
	185
	186	return rc;
c6ba7c9b HW	187	}
	188
	189	int smc_ism_register_dmb(struct smc_link_group *lgr, int dmb_len,
	190	struct smc_buf_desc *dmb_desc)
	191	{
	192	struct smcd_dmb dmb;
	193	int rc;
	194
	195	memset(&dmb, 0, sizeof(dmb));
	196	dmb.dmb_len = dmb_len;
	197	dmb.sba_idx = dmb_desc->sba_idx;
	198	dmb.vlan_id = lgr->vlan_id;
	199	dmb.rgid = lgr->peer_gid;
	200	rc = lgr->smcd->ops->register_dmb(lgr->smcd, &dmb);
	201	if (!rc) {
	202	dmb_desc->sba_idx = dmb.sba_idx;
	203	dmb_desc->token = dmb.dmb_tok;
	204	dmb_desc->cpu_addr = dmb.cpu_addr;
	205	dmb_desc->dma_addr = dmb.dma_addr;
	206	dmb_desc->len = dmb.dmb_len;
	207	}
	208	return rc;
	209	}
	210
aaf95523 GG	211	static int smc_nl_handle_smcd_dev(struct smcd_dev *smcd,
	212	struct sk_buff *skb,
	213	struct netlink_callback *cb)
	214	{
	215	char smc_pnet[SMC_MAX_PNETID_LEN + 1];
	216	struct smc_pci_dev smc_pci_dev;
	217	struct nlattr *port_attrs;
	218	struct nlattr *attrs;
	219	int use_cnt = 0;
	220	void *nlh;
	221
	222	nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
	223	&smc_gen_nl_family, NLM_F_MULTI,
	224	SMC_NETLINK_GET_DEV_SMCD);
	225	if (!nlh)
	226	goto errmsg;
	227	attrs = nla_nest_start(skb, SMC_GEN_DEV_SMCD);
	228	if (!attrs)
	229	goto errout;
	230	use_cnt = atomic_read(&smcd->lgr_cnt);
	231	if (nla_put_u32(skb, SMC_NLA_DEV_USE_CNT, use_cnt))
	232	goto errattr;
	233	if (nla_put_u8(skb, SMC_NLA_DEV_IS_CRIT, use_cnt > 0))
	234	goto errattr;
	235	memset(&smc_pci_dev, 0, sizeof(smc_pci_dev));
	236	smc_set_pci_values(to_pci_dev(smcd->dev.parent), &smc_pci_dev);
	237	if (nla_put_u32(skb, SMC_NLA_DEV_PCI_FID, smc_pci_dev.pci_fid))
	238	goto errattr;
	239	if (nla_put_u16(skb, SMC_NLA_DEV_PCI_CHID, smc_pci_dev.pci_pchid))
	240	goto errattr;
	241	if (nla_put_u16(skb, SMC_NLA_DEV_PCI_VENDOR, smc_pci_dev.pci_vendor))
	242	goto errattr;
	243	if (nla_put_u16(skb, SMC_NLA_DEV_PCI_DEVICE, smc_pci_dev.pci_device))
	244	goto errattr;
	245	if (nla_put_string(skb, SMC_NLA_DEV_PCI_ID, smc_pci_dev.pci_id))
	246	goto errattr;
	247
	248	port_attrs = nla_nest_start(skb, SMC_NLA_DEV_PORT);
	249	if (!port_attrs)
	250	goto errattr;
	251	if (nla_put_u8(skb, SMC_NLA_DEV_PORT_PNET_USR, smcd->pnetid_by_user))
	252	goto errportattr;
8a446536 GG	253	memcpy(smc_pnet, smcd->pnetid, SMC_MAX_PNETID_LEN);
8a446536 GG	254	smc_pnet[SMC_MAX_PNETID_LEN] = 0;
aaf95523 GG	255	if (nla_put_string(skb, SMC_NLA_DEV_PORT_PNETID, smc_pnet))
	256	goto errportattr;
	257
	258	nla_nest_end(skb, port_attrs);
	259	nla_nest_end(skb, attrs);
	260	genlmsg_end(skb, nlh);
	261	return 0;
	262
	263	errportattr:
	264	nla_nest_cancel(skb, port_attrs);
	265	errattr:
	266	nla_nest_cancel(skb, attrs);
	267	errout:
	268	nlmsg_cancel(skb, nlh);
	269	errmsg:
	270	return -EMSGSIZE;
	271	}
	272
	273	static void smc_nl_prep_smcd_dev(struct smcd_dev_list *dev_list,
	274	struct sk_buff *skb,
	275	struct netlink_callback *cb)
	276	{
	277	struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
	278	int snum = cb_ctx->pos[0];
	279	struct smcd_dev *smcd;
	280	int num = 0;
	281
	282	mutex_lock(&dev_list->mutex);
	283	list_for_each_entry(smcd, &dev_list->list, list) {
	284	if (num < snum)
	285	goto next;
	286	if (smc_nl_handle_smcd_dev(smcd, skb, cb))
	287	goto errout;
	288	next:
	289	num++;
	290	}
	291	errout:
	292	mutex_unlock(&dev_list->mutex);
	293	cb_ctx->pos[0] = num;
	294	}
	295
	296	int smcd_nl_get_device(struct sk_buff skb, struct netlink_callback cb)
	297	{
	298	smc_nl_prep_smcd_dev(&smcd_dev_list, skb, cb);
	299	return skb->len;
	300	}
	301
c6ba7c9b HW	302	struct smc_ism_event_work {
	303	struct work_struct work;
	304	struct smcd_dev *smcd;
	305	struct smcd_event event;
	306	};
	307
0d86caff UB	308	#define ISM_EVENT_REQUEST 0x0001
	309	#define ISM_EVENT_RESPONSE 0x0002
	310	#define ISM_EVENT_REQUEST_IR 0x00000001
0512f69e	311	#define ISM_EVENT_CODE_SHUTDOWN 0x80
0d86caff UB	312	#define ISM_EVENT_CODE_TESTLINK 0x83
0d86caff UB	313
0512f69e HW	314	union smcd_sw_event_info {
	315	u64 info;
	316	struct {
	317	u8 uid[SMC_LGR_ID_SIZE];
	318	unsigned short vlan_id;
	319	u16 code;
	320	};
	321	};
	322
0d86caff UB	323	static void smcd_handle_sw_event(struct smc_ism_event_work *wrk)
0d86caff UB	324	{
0512f69e	325	union smcd_sw_event_info ev_info;
0d86caff	326
0512f69e	327	ev_info.info = wrk->event.info;
0d86caff	328	switch (wrk->event.code) {
0512f69e HW	329	case ISM_EVENT_CODE_SHUTDOWN: /* Peer shut down DMBs */
	330	smc_smcd_terminate(wrk->smcd, wrk->event.tok, ev_info.vlan_id);
	331	break;
0d86caff	332	case ISM_EVENT_CODE_TESTLINK: /* Activity timer */
0d86caff UB	333	if (ev_info.code == ISM_EVENT_REQUEST) {
	334	ev_info.code = ISM_EVENT_RESPONSE;
	335	wrk->smcd->ops->signal_event(wrk->smcd,
	336	wrk->event.tok,
	337	ISM_EVENT_REQUEST_IR,
	338	ISM_EVENT_CODE_TESTLINK,
	339	ev_info.info);
	340	}
	341	break;
	342	}
	343	}
	344
0512f69e HW	345	int smc_ism_signal_shutdown(struct smc_link_group *lgr)
	346	{
	347	int rc;
	348	union smcd_sw_event_info ev_info;
	349
50c6b20e UB	350	if (lgr->peer_shutdown)
	351	return 0;
	352
0512f69e HW	353	memcpy(ev_info.uid, lgr->id, SMC_LGR_ID_SIZE);
	354	ev_info.vlan_id = lgr->vlan_id;
	355	ev_info.code = ISM_EVENT_REQUEST;
	356	rc = lgr->smcd->ops->signal_event(lgr->smcd, lgr->peer_gid,
	357	ISM_EVENT_REQUEST_IR,
	358	ISM_EVENT_CODE_SHUTDOWN,
	359	ev_info.info);
	360	return rc;
	361	}
	362
c6ba7c9b HW	363	/* worker for SMC-D events */
	364	static void smc_ism_event_work(struct work_struct *work)
	365	{
	366	struct smc_ism_event_work *wrk =
	367	container_of(work, struct smc_ism_event_work, work);
	368
	369	switch (wrk->event.type) {
	370	case ISM_EVENT_GID: /* GID event, token is peer GID */
0512f69e	371	smc_smcd_terminate(wrk->smcd, wrk->event.tok, VLAN_VID_MASK);
c6ba7c9b HW	372	break;
	373	case ISM_EVENT_DMB:
	374	break;
0d86caff UB	375	case ISM_EVENT_SWR: /* Software defined event */
	376	smcd_handle_sw_event(wrk);
	377	break;
c6ba7c9b HW	378	}
	379	kfree(wrk);
	380	}
	381
	382	static void smcd_release(struct device *dev)
	383	{
	384	struct smcd_dev *smcd = container_of(dev, struct smcd_dev, dev);
	385
	386	kfree(smcd->conn);
	387	kfree(smcd);
	388	}
	389
	390	struct smcd_dev smcd_alloc_dev(struct device parent, const char *name,
	391	const struct smcd_ops *ops, int max_dmbs)
	392	{
	393	struct smcd_dev *smcd;
	394
	395	smcd = kzalloc(sizeof(*smcd), GFP_KERNEL);
	396	if (!smcd)
	397	return NULL;
	398	smcd->conn = kcalloc(max_dmbs, sizeof(struct smc_connection *),
	399	GFP_KERNEL);
	400	if (!smcd->conn) {
	401	kfree(smcd);
	402	return NULL;
	403	}
	404
	405	smcd->dev.parent = parent;
	406	smcd->dev.release = smcd_release;
	407	device_initialize(&smcd->dev);
	408	dev_set_name(&smcd->dev, name);
	409	smcd->ops = ops;
fdff704d KG	410	if (smc_pnetid_by_dev_port(parent, 0, smcd->pnetid))
fdff704d KG	411	smc_pnetid_by_table_smcd(smcd);
c6ba7c9b HW	412
c6ba7c9b HW	413	spin_lock_init(&smcd->lock);
a0a62ee1	414	spin_lock_init(&smcd->lgr_lock);
c6ba7c9b	415	INIT_LIST_HEAD(&smcd->vlan);
a2351c5d	416	INIT_LIST_HEAD(&smcd->lgr_list);
5edd6b9c	417	init_waitqueue_head(&smcd->lgrs_deleted);
c6ba7c9b HW	418	smcd->event_wq = alloc_ordered_workqueue("ism_evt_wq-%s)",
c6ba7c9b HW	419	WQ_MEM_RECLAIM, name);
e183d4e4 KL	420	if (!smcd->event_wq) {
	421	kfree(smcd->conn);
	422	kfree(smcd);
	423	return NULL;
	424	}
c6ba7c9b HW	425	return smcd;
	426	}
	427	EXPORT_SYMBOL_GPL(smcd_alloc_dev);
	428
	429	int smcd_register_dev(struct smcd_dev *smcd)
	430	{
82087c03	431	mutex_lock(&smcd_dev_list.mutex);
201091eb UB	432	if (list_empty(&smcd_dev_list.list)) {
	433	u8 *system_eid = NULL;
	434
	435	smc_ism_get_system_eid(smcd, &system_eid);
fd6ebb6f	436	if (system_eid[24] != '0' \|\| system_eid[28] != '0')
201091eb UB	437	smc_ism_v2_capable = true;
201091eb UB	438	}
d70bf4f7 UB	439	/* sort list: devices without pnetid before devices with pnetid */
	440	if (smcd->pnetid[0])
	441	list_add_tail(&smcd->list, &smcd_dev_list.list);
	442	else
	443	list_add(&smcd->list, &smcd_dev_list.list);
82087c03	444	mutex_unlock(&smcd_dev_list.mutex);
c6ba7c9b	445
0a99be43 KG	446	pr_warn_ratelimited("smc: adding smcd device %s with pnetid %.16s%s\n",
	447	dev_name(&smcd->dev), smcd->pnetid,
	448	smcd->pnetid_by_user ? " (user defined)" : "");
	449
c6ba7c9b HW	450	return device_add(&smcd->dev);
	451	}
	452	EXPORT_SYMBOL_GPL(smcd_register_dev);
	453
	454	void smcd_unregister_dev(struct smcd_dev *smcd)
	455	{
0a99be43 KG	456	pr_warn_ratelimited("smc: removing smcd device %s\n",
0a99be43 KG	457	dev_name(&smcd->dev));
82087c03	458	mutex_lock(&smcd_dev_list.mutex);
50c6b20e	459	list_del_init(&smcd->list);
82087c03	460	mutex_unlock(&smcd_dev_list.mutex);
c3d9494e	461	smcd->going_away = 1;
5421ec28	462	smc_smcd_terminate_all(smcd);
c6ba7c9b HW	463	flush_workqueue(smcd->event_wq);
c6ba7c9b HW	464	destroy_workqueue(smcd->event_wq);
c6ba7c9b HW	465
	466	device_del(&smcd->dev);
	467	}
	468	EXPORT_SYMBOL_GPL(smcd_unregister_dev);
	469
	470	void smcd_free_dev(struct smcd_dev *smcd)
	471	{
	472	put_device(&smcd->dev);
	473	}
	474	EXPORT_SYMBOL_GPL(smcd_free_dev);
	475
	476	/* SMCD Device event handler. Called from ISM device interrupt handler.
	477	* Parameters are smcd device pointer,
	478	* - event->type (0 --> DMB, 1 --> GID),
	479	* - event->code (event code),
	480	* - event->tok (either DMB token when event type 0, or GID when event type 1)
	481	* - event->time (time of day)
	482	* - event->info (debug info).
	483	*
	484	* Context:
	485	* - Function called in IRQ context from ISM device driver event handler.
	486	*/
	487	void smcd_handle_event(struct smcd_dev smcd, struct smcd_event event)
	488	{
	489	struct smc_ism_event_work *wrk;
	490
c3d9494e UB	491	if (smcd->going_away)
c3d9494e UB	492	return;
c6ba7c9b HW	493	/* copy event to event work queue, and let it be handled there */
	494	wrk = kmalloc(sizeof(*wrk), GFP_ATOMIC);
	495	if (!wrk)
	496	return;
	497	INIT_WORK(&wrk->work, smc_ism_event_work);
	498	wrk->smcd = smcd;
	499	wrk->event = *event;
	500	queue_work(smcd->event_wq, &wrk->work);
	501	}
	502	EXPORT_SYMBOL_GPL(smcd_handle_event);
	503
	504	/* SMCD Device interrupt handler. Called from ISM device interrupt handler.
	505	* Parameters are smcd device pointer and DMB number. Find the connection and
	506	* schedule the tasklet for this connection.
	507	*
	508	* Context:
	509	* - Function called in IRQ context from ISM device driver IRQ handler.
	510	*/
	511	void smcd_handle_irq(struct smcd_dev *smcd, unsigned int dmbno)
	512	{
be244f28 HW	513	struct smc_connection *conn = NULL;
	514	unsigned long flags;
	515
	516	spin_lock_irqsave(&smcd->lock, flags);
	517	conn = smcd->conn[dmbno];
42bfba9e	518	if (conn && !conn->killed)
be244f28 HW	519	tasklet_schedule(&conn->rx_tsklet);
be244f28 HW	520	spin_unlock_irqrestore(&smcd->lock, flags);
c6ba7c9b HW	521	}
c6ba7c9b HW	522	EXPORT_SYMBOL_GPL(smcd_handle_irq);
201091eb UB	523
	524	void __init smc_ism_init(void)
	525	{
	526	smc_ism_v2_capable = false;
	527	}