[linux.git] / drivers / net / rionet.c

/*
 * rionet - Ethernet driver over RapidIO messaging services
 *
 * Copyright 2005 MontaVista Software, Inc.
 * Matt Porter <[email protected]>
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/dma-mapping.h>
#include <linux/delay.h>
#include <linux/rio.h>
#include <linux/rio_drv.h>
#include <linux/slab.h>
#include <linux/rio_ids.h>

#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/crc32.h>
#include <linux/ethtool.h>

#define DRV_NAME        "rionet"
#define DRV_VERSION     "0.2"
#define DRV_AUTHOR      "Matt Porter <[email protected]>"
#define DRV_DESC        "Ethernet over RapidIO"

MODULE_AUTHOR(DRV_AUTHOR);
MODULE_DESCRIPTION(DRV_DESC);
MODULE_LICENSE("GPL");

#define RIONET_DEFAULT_MSGLEVEL \
			(NETIF_MSG_DRV          | \
			 NETIF_MSG_LINK         | \
			 NETIF_MSG_RX_ERR       | \
			 NETIF_MSG_TX_ERR)

#define RIONET_DOORBELL_JOIN	0x1000
#define RIONET_DOORBELL_LEAVE	0x1001

#define RIONET_MAILBOX		0

#define RIONET_TX_RING_SIZE	CONFIG_RIONET_TX_SIZE
#define RIONET_RX_RING_SIZE	CONFIG_RIONET_RX_SIZE

static LIST_HEAD(rionet_peers);

struct rionet_private {
	struct rio_mport *mport;
	struct sk_buff *rx_skb[RIONET_RX_RING_SIZE];
	struct sk_buff *tx_skb[RIONET_TX_RING_SIZE];
	int rx_slot;
	int tx_slot;
	int tx_cnt;
	int ack_slot;
	spinlock_t lock;
	spinlock_t tx_lock;
	u32 msg_enable;
};

struct rionet_peer {
	struct list_head node;
	struct rio_dev *rdev;
	struct resource *res;
};

static int rionet_check = 0;
static int rionet_capable = 1;

/*
 * This is a fast lookup table for translating TX
 * Ethernet packets into a destination RIO device. It
 * could be made into a hash table to save memory depending
 * on system trade-offs.
 */
static struct rio_dev **rionet_active;

#define is_rionet_capable(pef, src_ops, dst_ops)		\
			((pef & RIO_PEF_INB_MBOX) &&		\
			 (pef & RIO_PEF_INB_DOORBELL) &&	\
			 (src_ops & RIO_SRC_OPS_DOORBELL) &&	\
			 (dst_ops & RIO_DST_OPS_DOORBELL))
#define dev_rionet_capable(dev) \
	is_rionet_capable(dev->pef, dev->src_ops, dev->dst_ops)

#define RIONET_MAC_MATCH(x)	(*(u32 *)x == 0x00010001)
#define RIONET_GET_DESTID(x)	(*(u16 *)(x + 4))

static int rionet_rx_clean(struct net_device *ndev)
{
	int i;
	int error = 0;
	struct rionet_private *rnet = netdev_priv(ndev);
	void *data;

	i = rnet->rx_slot;

	do {
		if (!rnet->rx_skb[i])
			continue;

		if (!(data = rio_get_inb_message(rnet->mport, RIONET_MAILBOX)))
			break;

		rnet->rx_skb[i]->data = data;
		skb_put(rnet->rx_skb[i], RIO_MAX_MSG_SIZE);
		rnet->rx_skb[i]->protocol =
		    eth_type_trans(rnet->rx_skb[i], ndev);
		error = netif_rx(rnet->rx_skb[i]);

		if (error == NET_RX_DROP) {
			ndev->stats.rx_dropped++;
		} else {
			ndev->stats.rx_packets++;
			ndev->stats.rx_bytes += RIO_MAX_MSG_SIZE;
		}

	} while ((i = (i + 1) % RIONET_RX_RING_SIZE) != rnet->rx_slot);

	return i;
}

static void rionet_rx_fill(struct net_device *ndev, int end)
{
	int i;
	struct rionet_private *rnet = netdev_priv(ndev);

	i = rnet->rx_slot;
	do {
		rnet->rx_skb[i] = dev_alloc_skb(RIO_MAX_MSG_SIZE);

		if (!rnet->rx_skb[i])
			break;

		rio_add_inb_buffer(rnet->mport, RIONET_MAILBOX,
				   rnet->rx_skb[i]->data);
	} while ((i = (i + 1) % RIONET_RX_RING_SIZE) != end);

	rnet->rx_slot = i;
}

static int rionet_queue_tx_msg(struct sk_buff *skb, struct net_device *ndev,
			       struct rio_dev *rdev)
{
	struct rionet_private *rnet = netdev_priv(ndev);

	rio_add_outb_message(rnet->mport, rdev, 0, skb->data, skb->len);
	rnet->tx_skb[rnet->tx_slot] = skb;

	ndev->stats.tx_packets++;
	ndev->stats.tx_bytes += skb->len;

	if (++rnet->tx_cnt == RIONET_TX_RING_SIZE)
		netif_stop_queue(ndev);

	++rnet->tx_slot;
	rnet->tx_slot &= (RIONET_TX_RING_SIZE - 1);

	if (netif_msg_tx_queued(rnet))
		printk(KERN_INFO "%s: queued skb %8.8x len %8.8x\n", DRV_NAME,
		       (u32) skb, skb->len);

	return 0;
}

static int rionet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
{
	int i;
	struct rionet_private *rnet = netdev_priv(ndev);
	struct ethhdr *eth = (struct ethhdr *)skb->data;
	u16 destid;
	unsigned long flags;

	local_irq_save(flags);
	if (!spin_trylock(&rnet->tx_lock)) {
		local_irq_restore(flags);
		return NETDEV_TX_LOCKED;
	}

	if ((rnet->tx_cnt + 1) > RIONET_TX_RING_SIZE) {
		netif_stop_queue(ndev);
		spin_unlock_irqrestore(&rnet->tx_lock, flags);
		printk(KERN_ERR "%s: BUG! Tx Ring full when queue awake!\n",
		       ndev->name);
		return NETDEV_TX_BUSY;
	}

	if (eth->h_dest[0] & 0x01) {
		for (i = 0; i < RIO_MAX_ROUTE_ENTRIES(rnet->mport->sys_size);
				i++)
			if (rionet_active[i])
				rionet_queue_tx_msg(skb, ndev,
						    rionet_active[i]);
	} else if (RIONET_MAC_MATCH(eth->h_dest)) {
		destid = RIONET_GET_DESTID(eth->h_dest);
		if (rionet_active[destid])
			rionet_queue_tx_msg(skb, ndev, rionet_active[destid]);
	}

	spin_unlock_irqrestore(&rnet->tx_lock, flags);

	return NETDEV_TX_OK;
}

static void rionet_dbell_event(struct rio_mport *mport, void *dev_id, u16 sid, u16 tid,
			       u16 info)
{
	struct net_device *ndev = dev_id;
	struct rionet_private *rnet = netdev_priv(ndev);
	struct rionet_peer *peer;

	if (netif_msg_intr(rnet))
		printk(KERN_INFO "%s: doorbell sid %4.4x tid %4.4x info %4.4x",
		       DRV_NAME, sid, tid, info);
	if (info == RIONET_DOORBELL_JOIN) {
		if (!rionet_active[sid]) {
			list_for_each_entry(peer, &rionet_peers, node) {
				if (peer->rdev->destid == sid)
					rionet_active[sid] = peer->rdev;
			}
			rio_mport_send_doorbell(mport, sid,
						RIONET_DOORBELL_JOIN);
		}
	} else if (info == RIONET_DOORBELL_LEAVE) {
		rionet_active[sid] = NULL;
	} else {
		if (netif_msg_intr(rnet))
			printk(KERN_WARNING "%s: unhandled doorbell\n",
			       DRV_NAME);
	}
}

static void rionet_inb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot)
{
	int n;
	struct net_device *ndev = dev_id;
	struct rionet_private *rnet = netdev_priv(ndev);

	if (netif_msg_intr(rnet))
		printk(KERN_INFO "%s: inbound message event, mbox %d slot %d\n",
		       DRV_NAME, mbox, slot);

	spin_lock(&rnet->lock);
	if ((n = rionet_rx_clean(ndev)) != rnet->rx_slot)
		rionet_rx_fill(ndev, n);
	spin_unlock(&rnet->lock);
}

static void rionet_outb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot)
{
	struct net_device *ndev = dev_id;
	struct rionet_private *rnet = netdev_priv(ndev);

	spin_lock(&rnet->lock);

	if (netif_msg_intr(rnet))
		printk(KERN_INFO
		       "%s: outbound message event, mbox %d slot %d\n",
		       DRV_NAME, mbox, slot);

	while (rnet->tx_cnt && (rnet->ack_slot != slot)) {
		/* dma unmap single */
		dev_kfree_skb_irq(rnet->tx_skb[rnet->ack_slot]);
		rnet->tx_skb[rnet->ack_slot] = NULL;
		++rnet->ack_slot;
		rnet->ack_slot &= (RIONET_TX_RING_SIZE - 1);
		rnet->tx_cnt--;
	}

	if (rnet->tx_cnt < RIONET_TX_RING_SIZE)
		netif_wake_queue(ndev);

	spin_unlock(&rnet->lock);
}

static int rionet_open(struct net_device *ndev)
{
	int i, rc = 0;
	struct rionet_peer *peer, *tmp;
	u32 pwdcsr;
	struct rionet_private *rnet = netdev_priv(ndev);

	if (netif_msg_ifup(rnet))
		printk(KERN_INFO "%s: open\n", DRV_NAME);

	if ((rc = rio_request_inb_dbell(rnet->mport,
					(void *)ndev,
					RIONET_DOORBELL_JOIN,
					RIONET_DOORBELL_LEAVE,
					rionet_dbell_event)) < 0)
		goto out;

	if ((rc = rio_request_inb_mbox(rnet->mport,
				       (void *)ndev,
				       RIONET_MAILBOX,
				       RIONET_RX_RING_SIZE,
				       rionet_inb_msg_event)) < 0)
		goto out;

	if ((rc = rio_request_outb_mbox(rnet->mport,
					(void *)ndev,
					RIONET_MAILBOX,
					RIONET_TX_RING_SIZE,
					rionet_outb_msg_event)) < 0)
		goto out;

	/* Initialize inbound message ring */
	for (i = 0; i < RIONET_RX_RING_SIZE; i++)
		rnet->rx_skb[i] = NULL;
	rnet->rx_slot = 0;
	rionet_rx_fill(ndev, 0);

	rnet->tx_slot = 0;
	rnet->tx_cnt = 0;
	rnet->ack_slot = 0;

	netif_carrier_on(ndev);
	netif_start_queue(ndev);

	list_for_each_entry_safe(peer, tmp, &rionet_peers, node) {
		if (!(peer->res = rio_request_outb_dbell(peer->rdev,
							 RIONET_DOORBELL_JOIN,
							 RIONET_DOORBELL_LEAVE)))
		{
			printk(KERN_ERR "%s: error requesting doorbells\n",
			       DRV_NAME);
			continue;
		}

		/*
		 * If device has initialized inbound doorbells,
		 * send a join message
		 */
		rio_read_config_32(peer->rdev, RIO_WRITE_PORT_CSR, &pwdcsr);
		if (pwdcsr & RIO_DOORBELL_AVAIL)
			rio_send_doorbell(peer->rdev, RIONET_DOORBELL_JOIN);
	}

      out:
	return rc;
}

static int rionet_close(struct net_device *ndev)
{
	struct rionet_private *rnet = netdev_priv(ndev);
	struct rionet_peer *peer, *tmp;
	int i;

	if (netif_msg_ifup(rnet))
		printk(KERN_INFO "%s: close\n", DRV_NAME);

	netif_stop_queue(ndev);
	netif_carrier_off(ndev);

	for (i = 0; i < RIONET_RX_RING_SIZE; i++)
		kfree_skb(rnet->rx_skb[i]);

	list_for_each_entry_safe(peer, tmp, &rionet_peers, node) {
		if (rionet_active[peer->rdev->destid]) {
			rio_send_doorbell(peer->rdev, RIONET_DOORBELL_LEAVE);
			rionet_active[peer->rdev->destid] = NULL;
		}
		rio_release_outb_dbell(peer->rdev, peer->res);
	}

	rio_release_inb_dbell(rnet->mport, RIONET_DOORBELL_JOIN,
			      RIONET_DOORBELL_LEAVE);
	rio_release_inb_mbox(rnet->mport, RIONET_MAILBOX);
	rio_release_outb_mbox(rnet->mport, RIONET_MAILBOX);

	return 0;
}

static void rionet_remove(struct rio_dev *rdev)
{
	struct net_device *ndev = NULL;
	struct rionet_peer *peer, *tmp;

	free_pages((unsigned long)rionet_active, rdev->net->hport->sys_size ?
					__fls(sizeof(void *)) + 4 : 0);
	unregister_netdev(ndev);
	free_netdev(ndev);

	list_for_each_entry_safe(peer, tmp, &rionet_peers, node) {
		list_del(&peer->node);
		kfree(peer);
	}
}

static void rionet_get_drvinfo(struct net_device *ndev,
			       struct ethtool_drvinfo *info)
{
	struct rionet_private *rnet = netdev_priv(ndev);

	strcpy(info->driver, DRV_NAME);
	strcpy(info->version, DRV_VERSION);
	strcpy(info->fw_version, "n/a");
	strcpy(info->bus_info, rnet->mport->name);
}

static u32 rionet_get_msglevel(struct net_device *ndev)
{
	struct rionet_private *rnet = netdev_priv(ndev);

	return rnet->msg_enable;
}

static void rionet_set_msglevel(struct net_device *ndev, u32 value)
{
	struct rionet_private *rnet = netdev_priv(ndev);

	rnet->msg_enable = value;
}

static const struct ethtool_ops rionet_ethtool_ops = {
	.get_drvinfo = rionet_get_drvinfo,
	.get_msglevel = rionet_get_msglevel,
	.set_msglevel = rionet_set_msglevel,
	.get_link = ethtool_op_get_link,
};

static const struct net_device_ops rionet_netdev_ops = {
	.ndo_open		= rionet_open,
	.ndo_stop		= rionet_close,
	.ndo_start_xmit		= rionet_start_xmit,
	.ndo_change_mtu		= eth_change_mtu,
	.ndo_validate_addr	= eth_validate_addr,
	.ndo_set_mac_address	= eth_mac_addr,
};

static int rionet_setup_netdev(struct rio_mport *mport)
{
	int rc = 0;
	struct net_device *ndev = NULL;
	struct rionet_private *rnet;
	u16 device_id;

	/* Allocate our net_device structure */
	ndev = alloc_etherdev(sizeof(struct rionet_private));
	if (ndev == NULL) {
		printk(KERN_INFO "%s: could not allocate ethernet device.\n",
		       DRV_NAME);
		rc = -ENOMEM;
		goto out;
	}

	rionet_active = (struct rio_dev **)__get_free_pages(GFP_KERNEL,
			mport->sys_size ? __fls(sizeof(void *)) + 4 : 0);
	if (!rionet_active) {
		rc = -ENOMEM;
		goto out;
	}
	memset((void *)rionet_active, 0, sizeof(void *) *
				RIO_MAX_ROUTE_ENTRIES(mport->sys_size));

	/* Set up private area */
	rnet = netdev_priv(ndev);
	rnet->mport = mport;

	/* Set the default MAC address */
	device_id = rio_local_get_device_id(mport);
	ndev->dev_addr[0] = 0x00;
	ndev->dev_addr[1] = 0x01;
	ndev->dev_addr[2] = 0x00;
	ndev->dev_addr[3] = 0x01;
	ndev->dev_addr[4] = device_id >> 8;
	ndev->dev_addr[5] = device_id & 0xff;

	ndev->netdev_ops = &rionet_netdev_ops;
	ndev->mtu = RIO_MAX_MSG_SIZE - 14;
	ndev->features = NETIF_F_LLTX;
	SET_ETHTOOL_OPS(ndev, &rionet_ethtool_ops);

	spin_lock_init(&rnet->lock);
	spin_lock_init(&rnet->tx_lock);

	rnet->msg_enable = RIONET_DEFAULT_MSGLEVEL;

	rc = register_netdev(ndev);
	if (rc != 0)
		goto out;

	printk("%s: %s %s Version %s, MAC %pM\n",
	       ndev->name,
	       DRV_NAME,
	       DRV_DESC,
	       DRV_VERSION,
	       ndev->dev_addr);

      out:
	return rc;
}

/*
 * XXX Make multi-net safe
 */
static int rionet_probe(struct rio_dev *rdev, const struct rio_device_id *id)
{
	int rc = -ENODEV;
	u32 lpef, lsrc_ops, ldst_ops;
	struct rionet_peer *peer;

	/* If local device is not rionet capable, give up quickly */
	if (!rionet_capable)
		goto out;

	/*
	 * First time through, make sure local device is rionet
	 * capable, setup netdev,  and set flags so this is skipped
	 * on later probes
	 */
	if (!rionet_check) {
		rio_local_read_config_32(rdev->net->hport, RIO_PEF_CAR, &lpef);
		rio_local_read_config_32(rdev->net->hport, RIO_SRC_OPS_CAR,
					 &lsrc_ops);
		rio_local_read_config_32(rdev->net->hport, RIO_DST_OPS_CAR,
					 &ldst_ops);
		if (!is_rionet_capable(lpef, lsrc_ops, ldst_ops)) {
			printk(KERN_ERR
			       "%s: local device is not network capable\n",
			       DRV_NAME);
			rionet_check = 1;
			rionet_capable = 0;
			goto out;
		}

		rc = rionet_setup_netdev(rdev->net->hport);
		rionet_check = 1;
	}

	/*
	 * If the remote device has mailbox/doorbell capabilities,
	 * add it to the peer list.
	 */
	if (dev_rionet_capable(rdev)) {
		if (!(peer = kmalloc(sizeof(struct rionet_peer), GFP_KERNEL))) {
			rc = -ENOMEM;
			goto out;
		}
		peer->rdev = rdev;
		list_add_tail(&peer->node, &rionet_peers);
	}

      out:
	return rc;
}

static struct rio_device_id rionet_id_table[] = {
	{RIO_DEVICE(RIO_ANY_ID, RIO_ANY_ID)}
};

static struct rio_driver rionet_driver = {
	.name = "rionet",
	.id_table = rionet_id_table,
	.probe = rionet_probe,
	.remove = rionet_remove,
};

static int __init rionet_init(void)
{
	return rio_register_driver(&rionet_driver);
}

static void __exit rionet_exit(void)
{
	rio_unregister_driver(&rionet_driver);
}

late_initcall(rionet_init);
module_exit(rionet_exit);
Commit	Line	Data
f89efd52 MP	1	/*
	2	* rionet - Ethernet driver over RapidIO messaging services
	3	*
	4	* Copyright 2005 MontaVista Software, Inc.
	5	* Matt Porter <[email protected]>
	6	*
	7	* This program is free software; you can redistribute it and/or modify it
	8	* under the terms of the GNU General Public License as published by the
	9	* Free Software Foundation; either version 2 of the License, or (at your
	10	* option) any later version.
	11	*/
	12
	13	#include <linux/module.h>
	14	#include <linux/kernel.h>
	15	#include <linux/dma-mapping.h>
	16	#include <linux/delay.h>
	17	#include <linux/rio.h>
	18	#include <linux/rio_drv.h>
5a0e3ad6	19	#include <linux/slab.h>
f89efd52 MP	20	#include <linux/rio_ids.h>
	21
	22	#include <linux/netdevice.h>
	23	#include <linux/etherdevice.h>
	24	#include <linux/skbuff.h>
	25	#include <linux/crc32.h>
	26	#include <linux/ethtool.h>
	27
	28	#define DRV_NAME "rionet"
	29	#define DRV_VERSION "0.2"
	30	#define DRV_AUTHOR "Matt Porter <[email protected]>"
	31	#define DRV_DESC "Ethernet over RapidIO"
	32
	33	MODULE_AUTHOR(DRV_AUTHOR);
	34	MODULE_DESCRIPTION(DRV_DESC);
	35	MODULE_LICENSE("GPL");
	36
	37	#define RIONET_DEFAULT_MSGLEVEL \
	38	(NETIF_MSG_DRV \| \
	39	NETIF_MSG_LINK \| \
	40	NETIF_MSG_RX_ERR \| \
	41	NETIF_MSG_TX_ERR)
	42
	43	#define RIONET_DOORBELL_JOIN 0x1000
	44	#define RIONET_DOORBELL_LEAVE 0x1001
	45
	46	#define RIONET_MAILBOX 0
	47
	48	#define RIONET_TX_RING_SIZE CONFIG_RIONET_TX_SIZE
	49	#define RIONET_RX_RING_SIZE CONFIG_RIONET_RX_SIZE
	50
	51	static LIST_HEAD(rionet_peers);
	52
	53	struct rionet_private {
	54	struct rio_mport *mport;
	55	struct sk_buff *rx_skb[RIONET_RX_RING_SIZE];
	56	struct sk_buff *tx_skb[RIONET_TX_RING_SIZE];
f89efd52 MP	57	int rx_slot;
	58	int tx_slot;
	59	int tx_cnt;
	60	int ack_slot;
	61	spinlock_t lock;
	62	spinlock_t tx_lock;
	63	u32 msg_enable;
	64	};
	65
	66	struct rionet_peer {
	67	struct list_head node;
	68	struct rio_dev *rdev;
	69	struct resource *res;
	70	};
	71
	72	static int rionet_check = 0;
	73	static int rionet_capable = 1;
	74
	75	/*
411c9403	76	* This is a fast lookup table for translating TX
f89efd52 MP	77	* Ethernet packets into a destination RIO device. It
	78	* could be made into a hash table to save memory depending
	79	* on system trade-offs.
	80	*/
e0423236	81	static struct rio_dev **rionet_active;
f89efd52 MP	82
	83	#define is_rionet_capable(pef, src_ops, dst_ops) \
	84	((pef & RIO_PEF_INB_MBOX) && \
	85	(pef & RIO_PEF_INB_DOORBELL) && \
	86	(src_ops & RIO_SRC_OPS_DOORBELL) && \
	87	(dst_ops & RIO_DST_OPS_DOORBELL))
	88	#define dev_rionet_capable(dev) \
	89	is_rionet_capable(dev->pef, dev->src_ops, dev->dst_ops)
	90
	91	#define RIONET_MAC_MATCH(x) ((u32 )x == 0x00010001)
	92	#define RIONET_GET_DESTID(x) ((u16 )(x + 4))
	93
f89efd52 MP	94	static int rionet_rx_clean(struct net_device *ndev)
	95	{
	96	int i;
	97	int error = 0;
4cf1653a	98	struct rionet_private *rnet = netdev_priv(ndev);
f89efd52 MP	99	void *data;
	100
	101	i = rnet->rx_slot;
	102
	103	do {
	104	if (!rnet->rx_skb[i])
	105	continue;
	106
	107	if (!(data = rio_get_inb_message(rnet->mport, RIONET_MAILBOX)))
	108	break;
	109
	110	rnet->rx_skb[i]->data = data;
	111	skb_put(rnet->rx_skb[i], RIO_MAX_MSG_SIZE);
f89efd52 MP	112	rnet->rx_skb[i]->protocol =
	113	eth_type_trans(rnet->rx_skb[i], ndev);
	114	error = netif_rx(rnet->rx_skb[i]);
	115
	116	if (error == NET_RX_DROP) {
09f75cd7	117	ndev->stats.rx_dropped++;
f89efd52	118	} else {
09f75cd7 JG	119	ndev->stats.rx_packets++;
09f75cd7 JG	120	ndev->stats.rx_bytes += RIO_MAX_MSG_SIZE;
f89efd52 MP	121	}
	122
	123	} while ((i = (i + 1) % RIONET_RX_RING_SIZE) != rnet->rx_slot);
	124
	125	return i;
	126	}
	127
	128	static void rionet_rx_fill(struct net_device *ndev, int end)
	129	{
	130	int i;
4cf1653a	131	struct rionet_private *rnet = netdev_priv(ndev);
f89efd52 MP	132
	133	i = rnet->rx_slot;
	134	do {
	135	rnet->rx_skb[i] = dev_alloc_skb(RIO_MAX_MSG_SIZE);
	136
	137	if (!rnet->rx_skb[i])
	138	break;
	139
	140	rio_add_inb_buffer(rnet->mport, RIONET_MAILBOX,
	141	rnet->rx_skb[i]->data);
	142	} while ((i = (i + 1) % RIONET_RX_RING_SIZE) != end);
	143
	144	rnet->rx_slot = i;
	145	}
	146
	147	static int rionet_queue_tx_msg(struct sk_buff skb, struct net_device ndev,
	148	struct rio_dev *rdev)
	149	{
4cf1653a	150	struct rionet_private *rnet = netdev_priv(ndev);
f89efd52 MP	151
	152	rio_add_outb_message(rnet->mport, rdev, 0, skb->data, skb->len);
	153	rnet->tx_skb[rnet->tx_slot] = skb;
	154
09f75cd7 JG	155	ndev->stats.tx_packets++;
09f75cd7 JG	156	ndev->stats.tx_bytes += skb->len;
f89efd52 MP	157
	158	if (++rnet->tx_cnt == RIONET_TX_RING_SIZE)
	159	netif_stop_queue(ndev);
	160
	161	++rnet->tx_slot;
	162	rnet->tx_slot &= (RIONET_TX_RING_SIZE - 1);
	163
	164	if (netif_msg_tx_queued(rnet))
	165	printk(KERN_INFO "%s: queued skb %8.8x len %8.8x\n", DRV_NAME,
	166	(u32) skb, skb->len);
	167
	168	return 0;
	169	}
	170
	171	static int rionet_start_xmit(struct sk_buff skb, struct net_device ndev)
	172	{
	173	int i;
4cf1653a	174	struct rionet_private *rnet = netdev_priv(ndev);
f89efd52 MP	175	struct ethhdr eth = (struct ethhdr )skb->data;
	176	u16 destid;
	177	unsigned long flags;
	178
	179	local_irq_save(flags);
	180	if (!spin_trylock(&rnet->tx_lock)) {
	181	local_irq_restore(flags);
	182	return NETDEV_TX_LOCKED;
	183	}
	184
	185	if ((rnet->tx_cnt + 1) > RIONET_TX_RING_SIZE) {
	186	netif_stop_queue(ndev);
	187	spin_unlock_irqrestore(&rnet->tx_lock, flags);
	188	printk(KERN_ERR "%s: BUG! Tx Ring full when queue awake!\n",
	189	ndev->name);
	190	return NETDEV_TX_BUSY;
	191	}
	192
	193	if (eth->h_dest[0] & 0x01) {
e0423236 ZW	194	for (i = 0; i < RIO_MAX_ROUTE_ENTRIES(rnet->mport->sys_size);
e0423236 ZW	195	i++)
f89efd52 MP	196	if (rionet_active[i])
	197	rionet_queue_tx_msg(skb, ndev,
	198	rionet_active[i]);
	199	} else if (RIONET_MAC_MATCH(eth->h_dest)) {
	200	destid = RIONET_GET_DESTID(eth->h_dest);
	201	if (rionet_active[destid])
	202	rionet_queue_tx_msg(skb, ndev, rionet_active[destid]);
	203	}
	204
	205	spin_unlock_irqrestore(&rnet->tx_lock, flags);
	206
6ed10654	207	return NETDEV_TX_OK;
f89efd52 MP	208	}
	209
	210	static void rionet_dbell_event(struct rio_mport mport, void dev_id, u16 sid, u16 tid,
	211	u16 info)
	212	{
	213	struct net_device *ndev = dev_id;
4cf1653a	214	struct rionet_private *rnet = netdev_priv(ndev);
f89efd52 MP	215	struct rionet_peer *peer;
	216
	217	if (netif_msg_intr(rnet))
	218	printk(KERN_INFO "%s: doorbell sid %4.4x tid %4.4x info %4.4x",
	219	DRV_NAME, sid, tid, info);
	220	if (info == RIONET_DOORBELL_JOIN) {
	221	if (!rionet_active[sid]) {
	222	list_for_each_entry(peer, &rionet_peers, node) {
	223	if (peer->rdev->destid == sid)
	224	rionet_active[sid] = peer->rdev;
	225	}
	226	rio_mport_send_doorbell(mport, sid,
	227	RIONET_DOORBELL_JOIN);
	228	}
	229	} else if (info == RIONET_DOORBELL_LEAVE) {
	230	rionet_active[sid] = NULL;
	231	} else {
	232	if (netif_msg_intr(rnet))
	233	printk(KERN_WARNING "%s: unhandled doorbell\n",
	234	DRV_NAME);
	235	}
	236	}
	237
	238	static void rionet_inb_msg_event(struct rio_mport mport, void dev_id, int mbox, int slot)
	239	{
	240	int n;
	241	struct net_device *ndev = dev_id;
4cf1653a	242	struct rionet_private *rnet = netdev_priv(ndev);
f89efd52 MP	243
	244	if (netif_msg_intr(rnet))
	245	printk(KERN_INFO "%s: inbound message event, mbox %d slot %d\n",
	246	DRV_NAME, mbox, slot);
	247
	248	spin_lock(&rnet->lock);
	249	if ((n = rionet_rx_clean(ndev)) != rnet->rx_slot)
	250	rionet_rx_fill(ndev, n);
	251	spin_unlock(&rnet->lock);
	252	}
	253
	254	static void rionet_outb_msg_event(struct rio_mport mport, void dev_id, int mbox, int slot)
	255	{
	256	struct net_device *ndev = dev_id;
4cf1653a	257	struct rionet_private *rnet = netdev_priv(ndev);
f89efd52 MP	258
	259	spin_lock(&rnet->lock);
	260
	261	if (netif_msg_intr(rnet))
	262	printk(KERN_INFO
	263	"%s: outbound message event, mbox %d slot %d\n",
	264	DRV_NAME, mbox, slot);
	265
	266	while (rnet->tx_cnt && (rnet->ack_slot != slot)) {
	267	/* dma unmap single */
	268	dev_kfree_skb_irq(rnet->tx_skb[rnet->ack_slot]);
	269	rnet->tx_skb[rnet->ack_slot] = NULL;
	270	++rnet->ack_slot;
	271	rnet->ack_slot &= (RIONET_TX_RING_SIZE - 1);
	272	rnet->tx_cnt--;
	273	}
	274
	275	if (rnet->tx_cnt < RIONET_TX_RING_SIZE)
	276	netif_wake_queue(ndev);
	277
	278	spin_unlock(&rnet->lock);
	279	}
	280
	281	static int rionet_open(struct net_device *ndev)
	282	{
	283	int i, rc = 0;
	284	struct rionet_peer peer, tmp;
	285	u32 pwdcsr;
4cf1653a	286	struct rionet_private *rnet = netdev_priv(ndev);
f89efd52 MP	287
	288	if (netif_msg_ifup(rnet))
	289	printk(KERN_INFO "%s: open\n", DRV_NAME);
	290
	291	if ((rc = rio_request_inb_dbell(rnet->mport,
	292	(void *)ndev,
	293	RIONET_DOORBELL_JOIN,
	294	RIONET_DOORBELL_LEAVE,
	295	rionet_dbell_event)) < 0)
	296	goto out;
	297
	298	if ((rc = rio_request_inb_mbox(rnet->mport,
	299	(void *)ndev,
	300	RIONET_MAILBOX,
	301	RIONET_RX_RING_SIZE,
	302	rionet_inb_msg_event)) < 0)
	303	goto out;
	304
	305	if ((rc = rio_request_outb_mbox(rnet->mport,
	306	(void *)ndev,
	307	RIONET_MAILBOX,
	308	RIONET_TX_RING_SIZE,
	309	rionet_outb_msg_event)) < 0)
	310	goto out;
	311
	312	/* Initialize inbound message ring */
	313	for (i = 0; i < RIONET_RX_RING_SIZE; i++)
	314	rnet->rx_skb[i] = NULL;
	315	rnet->rx_slot = 0;
	316	rionet_rx_fill(ndev, 0);
	317
	318	rnet->tx_slot = 0;
	319	rnet->tx_cnt = 0;
	320	rnet->ack_slot = 0;
	321
	322	netif_carrier_on(ndev);
	323	netif_start_queue(ndev);
	324
	325	list_for_each_entry_safe(peer, tmp, &rionet_peers, node) {
	326	if (!(peer->res = rio_request_outb_dbell(peer->rdev,
	327	RIONET_DOORBELL_JOIN,
	328	RIONET_DOORBELL_LEAVE)))
	329	{
	330	printk(KERN_ERR "%s: error requesting doorbells\n",
	331	DRV_NAME);
	332	continue;
	333	}
	334
	335	/*
	336	* If device has initialized inbound doorbells,
	337	* send a join message
	338	*/
	339	rio_read_config_32(peer->rdev, RIO_WRITE_PORT_CSR, &pwdcsr);
	340	if (pwdcsr & RIO_DOORBELL_AVAIL)
	341	rio_send_doorbell(peer->rdev, RIONET_DOORBELL_JOIN);
	342	}
	343
	344	out:
	345	return rc;
	346	}
	347
	348	static int rionet_close(struct net_device *ndev)
	349	{
4cf1653a	350	struct rionet_private *rnet = netdev_priv(ndev);
f89efd52 MP	351	struct rionet_peer peer, tmp;
	352	int i;
	353
	354	if (netif_msg_ifup(rnet))
	355	printk(KERN_INFO "%s: close\n", DRV_NAME);
	356
	357	netif_stop_queue(ndev);
	358	netif_carrier_off(ndev);
	359
	360	for (i = 0; i < RIONET_RX_RING_SIZE; i++)
aaff1e19	361	kfree_skb(rnet->rx_skb[i]);
f89efd52 MP	362
	363	list_for_each_entry_safe(peer, tmp, &rionet_peers, node) {
	364	if (rionet_active[peer->rdev->destid]) {
	365	rio_send_doorbell(peer->rdev, RIONET_DOORBELL_LEAVE);
	366	rionet_active[peer->rdev->destid] = NULL;
	367	}
	368	rio_release_outb_dbell(peer->rdev, peer->res);
	369	}
	370
	371	rio_release_inb_dbell(rnet->mport, RIONET_DOORBELL_JOIN,
	372	RIONET_DOORBELL_LEAVE);
	373	rio_release_inb_mbox(rnet->mport, RIONET_MAILBOX);
	374	rio_release_outb_mbox(rnet->mport, RIONET_MAILBOX);
	375
	376	return 0;
	377	}
	378
	379	static void rionet_remove(struct rio_dev *rdev)
	380	{
	381	struct net_device *ndev = NULL;
	382	struct rionet_peer peer, tmp;
	383
e0423236	384	free_pages((unsigned long)rionet_active, rdev->net->hport->sys_size ?
388b78ad	385	__fls(sizeof(void *)) + 4 : 0);
f89efd52	386	unregister_netdev(ndev);
22138d30	387	free_netdev(ndev);
f89efd52 MP	388
	389	list_for_each_entry_safe(peer, tmp, &rionet_peers, node) {
	390	list_del(&peer->node);
	391	kfree(peer);
	392	}
	393	}
	394
	395	static void rionet_get_drvinfo(struct net_device *ndev,
	396	struct ethtool_drvinfo *info)
	397	{
4cf1653a	398	struct rionet_private *rnet = netdev_priv(ndev);
f89efd52 MP	399
	400	strcpy(info->driver, DRV_NAME);
	401	strcpy(info->version, DRV_VERSION);
	402	strcpy(info->fw_version, "n/a");
	403	strcpy(info->bus_info, rnet->mport->name);
	404	}
	405
	406	static u32 rionet_get_msglevel(struct net_device *ndev)
	407	{
4cf1653a	408	struct rionet_private *rnet = netdev_priv(ndev);
f89efd52 MP	409
	410	return rnet->msg_enable;
	411	}
	412
	413	static void rionet_set_msglevel(struct net_device *ndev, u32 value)
	414	{
4cf1653a	415	struct rionet_private *rnet = netdev_priv(ndev);
f89efd52 MP	416
	417	rnet->msg_enable = value;
	418	}
	419
7282d491	420	static const struct ethtool_ops rionet_ethtool_ops = {
f89efd52 MP	421	.get_drvinfo = rionet_get_drvinfo,
	422	.get_msglevel = rionet_get_msglevel,
	423	.set_msglevel = rionet_set_msglevel,
	424	.get_link = ethtool_op_get_link,
	425	};
	426
a33a2bb3 AB	427	static const struct net_device_ops rionet_netdev_ops = {
	428	.ndo_open = rionet_open,
	429	.ndo_stop = rionet_close,
	430	.ndo_start_xmit = rionet_start_xmit,
	431	.ndo_change_mtu = eth_change_mtu,
	432	.ndo_validate_addr = eth_validate_addr,
	433	.ndo_set_mac_address = eth_mac_addr,
	434	};
	435
f89efd52 MP	436	static int rionet_setup_netdev(struct rio_mport *mport)
	437	{
	438	int rc = 0;
	439	struct net_device *ndev = NULL;
	440	struct rionet_private *rnet;
	441	u16 device_id;
	442
	443	/* Allocate our net_device structure */
	444	ndev = alloc_etherdev(sizeof(struct rionet_private));
	445	if (ndev == NULL) {
	446	printk(KERN_INFO "%s: could not allocate ethernet device.\n",
	447	DRV_NAME);
	448	rc = -ENOMEM;
	449	goto out;
	450	}
	451
e0423236	452	rionet_active = (struct rio_dev **)__get_free_pages(GFP_KERNEL,
388b78ad	453	mport->sys_size ? __fls(sizeof(void *)) + 4 : 0);
e0423236 ZW	454	if (!rionet_active) {
	455	rc = -ENOMEM;
	456	goto out;
	457	}
	458	memset((void )rionet_active, 0, sizeof(void ) *
	459	RIO_MAX_ROUTE_ENTRIES(mport->sys_size));
	460
f89efd52	461	/* Set up private area */
4cf1653a	462	rnet = netdev_priv(ndev);
f89efd52 MP	463	rnet->mport = mport;
	464
	465	/* Set the default MAC address */
	466	device_id = rio_local_get_device_id(mport);
	467	ndev->dev_addr[0] = 0x00;
	468	ndev->dev_addr[1] = 0x01;
	469	ndev->dev_addr[2] = 0x00;
	470	ndev->dev_addr[3] = 0x01;
	471	ndev->dev_addr[4] = device_id >> 8;
	472	ndev->dev_addr[5] = device_id & 0xff;
	473
a33a2bb3	474	ndev->netdev_ops = &rionet_netdev_ops;
f89efd52 MP	475	ndev->mtu = RIO_MAX_MSG_SIZE - 14;
	476	ndev->features = NETIF_F_LLTX;
	477	SET_ETHTOOL_OPS(ndev, &rionet_ethtool_ops);
	478
f89efd52 MP	479	spin_lock_init(&rnet->lock);
	480	spin_lock_init(&rnet->tx_lock);
	481
	482	rnet->msg_enable = RIONET_DEFAULT_MSGLEVEL;
	483
	484	rc = register_netdev(ndev);
	485	if (rc != 0)
	486	goto out;
	487
e174961c	488	printk("%s: %s %s Version %s, MAC %pM\n",
f89efd52 MP	489	ndev->name,
	490	DRV_NAME,
	491	DRV_DESC,
	492	DRV_VERSION,
e174961c	493	ndev->dev_addr);
f89efd52 MP	494
	495	out:
	496	return rc;
	497	}
	498
	499	/*
	500	* XXX Make multi-net safe
	501	*/
	502	static int rionet_probe(struct rio_dev rdev, const struct rio_device_id id)
	503	{
	504	int rc = -ENODEV;
	505	u32 lpef, lsrc_ops, ldst_ops;
	506	struct rionet_peer *peer;
	507
	508	/* If local device is not rionet capable, give up quickly */
	509	if (!rionet_capable)
	510	goto out;
	511
	512	/*
	513	* First time through, make sure local device is rionet
	514	* capable, setup netdev, and set flags so this is skipped
	515	* on later probes
	516	*/
	517	if (!rionet_check) {
	518	rio_local_read_config_32(rdev->net->hport, RIO_PEF_CAR, &lpef);
	519	rio_local_read_config_32(rdev->net->hport, RIO_SRC_OPS_CAR,
	520	&lsrc_ops);
	521	rio_local_read_config_32(rdev->net->hport, RIO_DST_OPS_CAR,
	522	&ldst_ops);
	523	if (!is_rionet_capable(lpef, lsrc_ops, ldst_ops)) {
	524	printk(KERN_ERR
	525	"%s: local device is not network capable\n",
	526	DRV_NAME);
	527	rionet_check = 1;
	528	rionet_capable = 0;
	529	goto out;
	530	}
	531
	532	rc = rionet_setup_netdev(rdev->net->hport);
	533	rionet_check = 1;
	534	}
	535
	536	/*
	537	* If the remote device has mailbox/doorbell capabilities,
	538	* add it to the peer list.
	539	*/
	540	if (dev_rionet_capable(rdev)) {
	541	if (!(peer = kmalloc(sizeof(struct rionet_peer), GFP_KERNEL))) {
	542	rc = -ENOMEM;
	543	goto out;
	544	}
	545	peer->rdev = rdev;
	546	list_add_tail(&peer->node, &rionet_peers);
	547	}
	548
	549	out:
	550	return rc;
	551	}
	552
	553	static struct rio_device_id rionet_id_table[] = {
	554	{RIO_DEVICE(RIO_ANY_ID, RIO_ANY_ID)}
	555	};
	556
	557	static struct rio_driver rionet_driver = {
558	.name = "rionet",
559	.id_table = rionet_id_table,
560	.probe = rionet_probe,
561	.remove = rionet_remove,
562	};
563
564	static int __init rionet_init(void)
565	{
566	return rio_register_driver(&rionet_driver);
567	}
568
569	static void __exit rionet_exit(void)
570	{
571	rio_unregister_driver(&rionet_driver);
572	}
573
2f809985	574	late_initcall(rionet_init);
f89efd52	575	module_exit(rionet_exit);