[linux-2.6-block.git] / drivers / net / rionet.c

/*
 * rionet - Ethernet driver over RapidIO messaging services
 *
 * Copyright 2005 MontaVista Software, Inc.
 * Matt Porter <mporter@kernel.crashing.org>
 *
 * 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/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 <mporter@kernel.crashing.org>"
#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 ?
					__ilog2(sizeof(void *)) + 4 : 0);
	unregister_netdev(ndev);
	kfree(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 ? __ilog2(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);
}

module_init(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 <mporter@kernel.crashing.org>
	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>
	19	#include <linux/rio_ids.h>
	20
	21	#include <linux/netdevice.h>
	22	#include <linux/etherdevice.h>
	23	#include <linux/skbuff.h>
	24	#include <linux/crc32.h>
	25	#include <linux/ethtool.h>
	26
	27	#define DRV_NAME "rionet"
	28	#define DRV_VERSION "0.2"
	29	#define DRV_AUTHOR "Matt Porter <mporter@kernel.crashing.org>"
	30	#define DRV_DESC "Ethernet over RapidIO"
	31
	32	MODULE_AUTHOR(DRV_AUTHOR);
	33	MODULE_DESCRIPTION(DRV_DESC);
	34	MODULE_LICENSE("GPL");
	35
	36	#define RIONET_DEFAULT_MSGLEVEL \
	37	(NETIF_MSG_DRV \| \
	38	NETIF_MSG_LINK \| \
	39	NETIF_MSG_RX_ERR \| \
	40	NETIF_MSG_TX_ERR)
	41
	42	#define RIONET_DOORBELL_JOIN 0x1000
	43	#define RIONET_DOORBELL_LEAVE 0x1001
	44
	45	#define RIONET_MAILBOX 0
	46
	47	#define RIONET_TX_RING_SIZE CONFIG_RIONET_TX_SIZE
	48	#define RIONET_RX_RING_SIZE CONFIG_RIONET_RX_SIZE
	49
	50	static LIST_HEAD(rionet_peers);
	51
	52	struct rionet_private {
	53	struct rio_mport *mport;
	54	struct sk_buff *rx_skb[RIONET_RX_RING_SIZE];
	55	struct sk_buff *tx_skb[RIONET_TX_RING_SIZE];
f89efd52 MP	56	int rx_slot;
	57	int tx_slot;
	58	int tx_cnt;
	59	int ack_slot;
	60	spinlock_t lock;
	61	spinlock_t tx_lock;
	62	u32 msg_enable;
	63	};
	64
	65	struct rionet_peer {
	66	struct list_head node;
	67	struct rio_dev *rdev;
	68	struct resource *res;
	69	};
	70
	71	static int rionet_check = 0;
	72	static int rionet_capable = 1;
	73
	74	/*
411c9403	75	* This is a fast lookup table for translating TX
f89efd52 MP	76	* Ethernet packets into a destination RIO device. It
	77	* could be made into a hash table to save memory depending
	78	* on system trade-offs.
	79	*/
e0423236	80	static struct rio_dev **rionet_active;
f89efd52 MP	81
	82	#define is_rionet_capable(pef, src_ops, dst_ops) \
	83	((pef & RIO_PEF_INB_MBOX) && \
	84	(pef & RIO_PEF_INB_DOORBELL) && \
	85	(src_ops & RIO_SRC_OPS_DOORBELL) && \
	86	(dst_ops & RIO_DST_OPS_DOORBELL))
	87	#define dev_rionet_capable(dev) \
	88	is_rionet_capable(dev->pef, dev->src_ops, dev->dst_ops)
	89
	90	#define RIONET_MAC_MATCH(x) ((u32 )x == 0x00010001)
	91	#define RIONET_GET_DESTID(x) ((u16 )(x + 4))
	92
f89efd52 MP	93	static int rionet_rx_clean(struct net_device *ndev)
	94	{
	95	int i;
	96	int error = 0;
4cf1653a	97	struct rionet_private *rnet = netdev_priv(ndev);
f89efd52 MP	98	void *data;
	99
	100	i = rnet->rx_slot;
	101
	102	do {
	103	if (!rnet->rx_skb[i])
	104	continue;
	105
	106	if (!(data = rio_get_inb_message(rnet->mport, RIONET_MAILBOX)))
	107	break;
	108
	109	rnet->rx_skb[i]->data = data;
	110	skb_put(rnet->rx_skb[i], RIO_MAX_MSG_SIZE);
f89efd52 MP	111	rnet->rx_skb[i]->protocol =
	112	eth_type_trans(rnet->rx_skb[i], ndev);
	113	error = netif_rx(rnet->rx_skb[i]);
	114
	115	if (error == NET_RX_DROP) {
09f75cd7	116	ndev->stats.rx_dropped++;
f89efd52	117	} else {
09f75cd7 JG	118	ndev->stats.rx_packets++;
09f75cd7 JG	119	ndev->stats.rx_bytes += RIO_MAX_MSG_SIZE;
f89efd52 MP	120	}
	121
	122	} while ((i = (i + 1) % RIONET_RX_RING_SIZE) != rnet->rx_slot);
	123
	124	return i;
	125	}
	126
	127	static void rionet_rx_fill(struct net_device *ndev, int end)
	128	{
	129	int i;
4cf1653a	130	struct rionet_private *rnet = netdev_priv(ndev);
f89efd52 MP	131
	132	i = rnet->rx_slot;
	133	do {
	134	rnet->rx_skb[i] = dev_alloc_skb(RIO_MAX_MSG_SIZE);
	135
	136	if (!rnet->rx_skb[i])
	137	break;
	138
	139	rio_add_inb_buffer(rnet->mport, RIONET_MAILBOX,
	140	rnet->rx_skb[i]->data);
	141	} while ((i = (i + 1) % RIONET_RX_RING_SIZE) != end);
	142
	143	rnet->rx_slot = i;
	144	}
	145
	146	static int rionet_queue_tx_msg(struct sk_buff skb, struct net_device ndev,
	147	struct rio_dev *rdev)
	148	{
4cf1653a	149	struct rionet_private *rnet = netdev_priv(ndev);
f89efd52 MP	150
	151	rio_add_outb_message(rnet->mport, rdev, 0, skb->data, skb->len);
	152	rnet->tx_skb[rnet->tx_slot] = skb;
	153
09f75cd7 JG	154	ndev->stats.tx_packets++;
09f75cd7 JG	155	ndev->stats.tx_bytes += skb->len;
f89efd52 MP	156
	157	if (++rnet->tx_cnt == RIONET_TX_RING_SIZE)
	158	netif_stop_queue(ndev);
	159
	160	++rnet->tx_slot;
	161	rnet->tx_slot &= (RIONET_TX_RING_SIZE - 1);
	162
	163	if (netif_msg_tx_queued(rnet))
	164	printk(KERN_INFO "%s: queued skb %8.8x len %8.8x\n", DRV_NAME,
	165	(u32) skb, skb->len);
	166
	167	return 0;
	168	}
	169
	170	static int rionet_start_xmit(struct sk_buff skb, struct net_device ndev)
	171	{
	172	int i;
4cf1653a	173	struct rionet_private *rnet = netdev_priv(ndev);
f89efd52 MP	174	struct ethhdr eth = (struct ethhdr )skb->data;
	175	u16 destid;
	176	unsigned long flags;
	177
	178	local_irq_save(flags);
	179	if (!spin_trylock(&rnet->tx_lock)) {
	180	local_irq_restore(flags);
	181	return NETDEV_TX_LOCKED;
	182	}
	183
	184	if ((rnet->tx_cnt + 1) > RIONET_TX_RING_SIZE) {
	185	netif_stop_queue(ndev);
	186	spin_unlock_irqrestore(&rnet->tx_lock, flags);
	187	printk(KERN_ERR "%s: BUG! Tx Ring full when queue awake!\n",
	188	ndev->name);
	189	return NETDEV_TX_BUSY;
	190	}
	191
	192	if (eth->h_dest[0] & 0x01) {
e0423236 ZW	193	for (i = 0; i < RIO_MAX_ROUTE_ENTRIES(rnet->mport->sys_size);
e0423236 ZW	194	i++)
f89efd52 MP	195	if (rionet_active[i])
	196	rionet_queue_tx_msg(skb, ndev,
	197	rionet_active[i]);
	198	} else if (RIONET_MAC_MATCH(eth->h_dest)) {
	199	destid = RIONET_GET_DESTID(eth->h_dest);
	200	if (rionet_active[destid])
	201	rionet_queue_tx_msg(skb, ndev, rionet_active[destid]);
	202	}
	203
	204	spin_unlock_irqrestore(&rnet->tx_lock, flags);
	205
6ed10654	206	return NETDEV_TX_OK;
f89efd52 MP	207	}
	208
	209	static void rionet_dbell_event(struct rio_mport mport, void dev_id, u16 sid, u16 tid,
	210	u16 info)
	211	{
	212	struct net_device *ndev = dev_id;
4cf1653a	213	struct rionet_private *rnet = netdev_priv(ndev);
f89efd52 MP	214	struct rionet_peer *peer;
	215
	216	if (netif_msg_intr(rnet))
	217	printk(KERN_INFO "%s: doorbell sid %4.4x tid %4.4x info %4.4x",
	218	DRV_NAME, sid, tid, info);
	219	if (info == RIONET_DOORBELL_JOIN) {
	220	if (!rionet_active[sid]) {
	221	list_for_each_entry(peer, &rionet_peers, node) {
	222	if (peer->rdev->destid == sid)
	223	rionet_active[sid] = peer->rdev;
	224	}
	225	rio_mport_send_doorbell(mport, sid,
	226	RIONET_DOORBELL_JOIN);
	227	}
	228	} else if (info == RIONET_DOORBELL_LEAVE) {
	229	rionet_active[sid] = NULL;
	230	} else {
	231	if (netif_msg_intr(rnet))
	232	printk(KERN_WARNING "%s: unhandled doorbell\n",
	233	DRV_NAME);
	234	}
	235	}
	236
	237	static void rionet_inb_msg_event(struct rio_mport mport, void dev_id, int mbox, int slot)
	238	{
	239	int n;
	240	struct net_device *ndev = dev_id;
4cf1653a	241	struct rionet_private *rnet = netdev_priv(ndev);
f89efd52 MP	242
	243	if (netif_msg_intr(rnet))
	244	printk(KERN_INFO "%s: inbound message event, mbox %d slot %d\n",
	245	DRV_NAME, mbox, slot);
	246
	247	spin_lock(&rnet->lock);
	248	if ((n = rionet_rx_clean(ndev)) != rnet->rx_slot)
	249	rionet_rx_fill(ndev, n);
	250	spin_unlock(&rnet->lock);
	251	}
	252
	253	static void rionet_outb_msg_event(struct rio_mport mport, void dev_id, int mbox, int slot)
	254	{
	255	struct net_device *ndev = dev_id;
4cf1653a	256	struct rionet_private *rnet = netdev_priv(ndev);
f89efd52 MP	257
	258	spin_lock(&rnet->lock);
	259
	260	if (netif_msg_intr(rnet))
	261	printk(KERN_INFO
	262	"%s: outbound message event, mbox %d slot %d\n",
	263	DRV_NAME, mbox, slot);
	264
	265	while (rnet->tx_cnt && (rnet->ack_slot != slot)) {
	266	/* dma unmap single */
	267	dev_kfree_skb_irq(rnet->tx_skb[rnet->ack_slot]);
	268	rnet->tx_skb[rnet->ack_slot] = NULL;
	269	++rnet->ack_slot;
	270	rnet->ack_slot &= (RIONET_TX_RING_SIZE - 1);
	271	rnet->tx_cnt--;
	272	}
	273
	274	if (rnet->tx_cnt < RIONET_TX_RING_SIZE)
	275	netif_wake_queue(ndev);
	276
	277	spin_unlock(&rnet->lock);
	278	}
	279
	280	static int rionet_open(struct net_device *ndev)
	281	{
	282	int i, rc = 0;
	283	struct rionet_peer peer, tmp;
	284	u32 pwdcsr;
4cf1653a	285	struct rionet_private *rnet = netdev_priv(ndev);
f89efd52 MP	286
	287	if (netif_msg_ifup(rnet))
	288	printk(KERN_INFO "%s: open\n", DRV_NAME);
	289
	290	if ((rc = rio_request_inb_dbell(rnet->mport,
	291	(void *)ndev,
	292	RIONET_DOORBELL_JOIN,
	293	RIONET_DOORBELL_LEAVE,
	294	rionet_dbell_event)) < 0)
	295	goto out;
	296
	297	if ((rc = rio_request_inb_mbox(rnet->mport,
	298	(void *)ndev,
	299	RIONET_MAILBOX,
	300	RIONET_RX_RING_SIZE,
	301	rionet_inb_msg_event)) < 0)
	302	goto out;
	303
	304	if ((rc = rio_request_outb_mbox(rnet->mport,
	305	(void *)ndev,
	306	RIONET_MAILBOX,
	307	RIONET_TX_RING_SIZE,
	308	rionet_outb_msg_event)) < 0)
	309	goto out;
	310
	311	/* Initialize inbound message ring */
	312	for (i = 0; i < RIONET_RX_RING_SIZE; i++)
	313	rnet->rx_skb[i] = NULL;
	314	rnet->rx_slot = 0;
	315	rionet_rx_fill(ndev, 0);
	316
	317	rnet->tx_slot = 0;
	318	rnet->tx_cnt = 0;
	319	rnet->ack_slot = 0;
	320
	321	netif_carrier_on(ndev);
	322	netif_start_queue(ndev);
	323
	324	list_for_each_entry_safe(peer, tmp, &rionet_peers, node) {
	325	if (!(peer->res = rio_request_outb_dbell(peer->rdev,
	326	RIONET_DOORBELL_JOIN,
	327	RIONET_DOORBELL_LEAVE)))
	328	{
	329	printk(KERN_ERR "%s: error requesting doorbells\n",
	330	DRV_NAME);
	331	continue;
	332	}
	333
	334	/*
	335	* If device has initialized inbound doorbells,
	336	* send a join message
	337	*/
	338	rio_read_config_32(peer->rdev, RIO_WRITE_PORT_CSR, &pwdcsr);
	339	if (pwdcsr & RIO_DOORBELL_AVAIL)
	340	rio_send_doorbell(peer->rdev, RIONET_DOORBELL_JOIN);
	341	}
	342
	343	out:
	344	return rc;
	345	}
	346
	347	static int rionet_close(struct net_device *ndev)
	348	{
4cf1653a	349	struct rionet_private *rnet = netdev_priv(ndev);
f89efd52 MP	350	struct rionet_peer peer, tmp;
	351	int i;
	352
	353	if (netif_msg_ifup(rnet))
	354	printk(KERN_INFO "%s: close\n", DRV_NAME);
	355
	356	netif_stop_queue(ndev);
	357	netif_carrier_off(ndev);
	358
	359	for (i = 0; i < RIONET_RX_RING_SIZE; i++)
aaff1e19	360	kfree_skb(rnet->rx_skb[i]);
f89efd52 MP	361
	362	list_for_each_entry_safe(peer, tmp, &rionet_peers, node) {
	363	if (rionet_active[peer->rdev->destid]) {
	364	rio_send_doorbell(peer->rdev, RIONET_DOORBELL_LEAVE);
	365	rionet_active[peer->rdev->destid] = NULL;
	366	}
	367	rio_release_outb_dbell(peer->rdev, peer->res);
	368	}
	369
	370	rio_release_inb_dbell(rnet->mport, RIONET_DOORBELL_JOIN,
	371	RIONET_DOORBELL_LEAVE);
	372	rio_release_inb_mbox(rnet->mport, RIONET_MAILBOX);
	373	rio_release_outb_mbox(rnet->mport, RIONET_MAILBOX);
	374
	375	return 0;
	376	}
	377
	378	static void rionet_remove(struct rio_dev *rdev)
	379	{
	380	struct net_device *ndev = NULL;
	381	struct rionet_peer peer, tmp;
	382
e0423236 ZW	383	free_pages((unsigned long)rionet_active, rdev->net->hport->sys_size ?
e0423236 ZW	384	__ilog2(sizeof(void *)) + 4 : 0);
f89efd52 MP	385	unregister_netdev(ndev);
	386	kfree(ndev);
	387
	388	list_for_each_entry_safe(peer, tmp, &rionet_peers, node) {
	389	list_del(&peer->node);
	390	kfree(peer);
	391	}
	392	}
	393
	394	static void rionet_get_drvinfo(struct net_device *ndev,
	395	struct ethtool_drvinfo *info)
	396	{
4cf1653a	397	struct rionet_private *rnet = netdev_priv(ndev);
f89efd52 MP	398
	399	strcpy(info->driver, DRV_NAME);
	400	strcpy(info->version, DRV_VERSION);
	401	strcpy(info->fw_version, "n/a");
	402	strcpy(info->bus_info, rnet->mport->name);
	403	}
	404
	405	static u32 rionet_get_msglevel(struct net_device *ndev)
	406	{
4cf1653a	407	struct rionet_private *rnet = netdev_priv(ndev);
f89efd52 MP	408
	409	return rnet->msg_enable;
	410	}
	411
	412	static void rionet_set_msglevel(struct net_device *ndev, u32 value)
	413	{
4cf1653a	414	struct rionet_private *rnet = netdev_priv(ndev);
f89efd52 MP	415
	416	rnet->msg_enable = value;
	417	}
	418
7282d491	419	static const struct ethtool_ops rionet_ethtool_ops = {
f89efd52 MP	420	.get_drvinfo = rionet_get_drvinfo,
	421	.get_msglevel = rionet_get_msglevel,
	422	.set_msglevel = rionet_set_msglevel,
	423	.get_link = ethtool_op_get_link,
	424	};
	425
a33a2bb3 AB	426	static const struct net_device_ops rionet_netdev_ops = {
	427	.ndo_open = rionet_open,
	428	.ndo_stop = rionet_close,
	429	.ndo_start_xmit = rionet_start_xmit,
	430	.ndo_change_mtu = eth_change_mtu,
	431	.ndo_validate_addr = eth_validate_addr,
	432	.ndo_set_mac_address = eth_mac_addr,
	433	};
	434
f89efd52 MP	435	static int rionet_setup_netdev(struct rio_mport *mport)
	436	{
	437	int rc = 0;
	438	struct net_device *ndev = NULL;
	439	struct rionet_private *rnet;
	440	u16 device_id;
	441
	442	/* Allocate our net_device structure */
	443	ndev = alloc_etherdev(sizeof(struct rionet_private));
	444	if (ndev == NULL) {
	445	printk(KERN_INFO "%s: could not allocate ethernet device.\n",
	446	DRV_NAME);
	447	rc = -ENOMEM;
	448	goto out;
	449	}
	450
e0423236 ZW	451	rionet_active = (struct rio_dev **)__get_free_pages(GFP_KERNEL,
	452	mport->sys_size ? __ilog2(sizeof(void *)) + 4 : 0);
	453	if (!rionet_active) {
	454	rc = -ENOMEM;
	455	goto out;
	456	}
	457	memset((void )rionet_active, 0, sizeof(void ) *
	458	RIO_MAX_ROUTE_ENTRIES(mport->sys_size));
	459
f89efd52	460	/* Set up private area */
4cf1653a	461	rnet = netdev_priv(ndev);
f89efd52 MP	462	rnet->mport = mport;
	463
	464	/* Set the default MAC address */
	465	device_id = rio_local_get_device_id(mport);
	466	ndev->dev_addr[0] = 0x00;
	467	ndev->dev_addr[1] = 0x01;
	468	ndev->dev_addr[2] = 0x00;
	469	ndev->dev_addr[3] = 0x01;
	470	ndev->dev_addr[4] = device_id >> 8;
	471	ndev->dev_addr[5] = device_id & 0xff;
	472
a33a2bb3	473	ndev->netdev_ops = &rionet_netdev_ops;
f89efd52 MP	474	ndev->mtu = RIO_MAX_MSG_SIZE - 14;
	475	ndev->features = NETIF_F_LLTX;
	476	SET_ETHTOOL_OPS(ndev, &rionet_ethtool_ops);
	477
f89efd52 MP	478	spin_lock_init(&rnet->lock);
	479	spin_lock_init(&rnet->tx_lock);
	480
	481	rnet->msg_enable = RIONET_DEFAULT_MSGLEVEL;
	482
	483	rc = register_netdev(ndev);
	484	if (rc != 0)
	485	goto out;
	486
e174961c	487	printk("%s: %s %s Version %s, MAC %pM\n",
f89efd52 MP	488	ndev->name,
	489	DRV_NAME,
	490	DRV_DESC,
	491	DRV_VERSION,
e174961c	492	ndev->dev_addr);
f89efd52 MP	493
	494	out:
	495	return rc;
	496	}
	497
	498	/*
	499	* XXX Make multi-net safe
	500	*/
	501	static int rionet_probe(struct rio_dev rdev, const struct rio_device_id id)
	502	{
	503	int rc = -ENODEV;
	504	u32 lpef, lsrc_ops, ldst_ops;
	505	struct rionet_peer *peer;
	506
	507	/* If local device is not rionet capable, give up quickly */
	508	if (!rionet_capable)
	509	goto out;
	510
	511	/*
	512	* First time through, make sure local device is rionet
	513	* capable, setup netdev, and set flags so this is skipped
	514	* on later probes
	515	*/
	516	if (!rionet_check) {
	517	rio_local_read_config_32(rdev->net->hport, RIO_PEF_CAR, &lpef);
	518	rio_local_read_config_32(rdev->net->hport, RIO_SRC_OPS_CAR,
	519	&lsrc_ops);
	520	rio_local_read_config_32(rdev->net->hport, RIO_DST_OPS_CAR,
	521	&ldst_ops);
	522	if (!is_rionet_capable(lpef, lsrc_ops, ldst_ops)) {
	523	printk(KERN_ERR
	524	"%s: local device is not network capable\n",
	525	DRV_NAME);
	526	rionet_check = 1;
	527	rionet_capable = 0;
	528	goto out;
	529	}
	530
	531	rc = rionet_setup_netdev(rdev->net->hport);
	532	rionet_check = 1;
	533	}
	534
	535	/*
	536	* If the remote device has mailbox/doorbell capabilities,
	537	* add it to the peer list.
	538	*/
	539	if (dev_rionet_capable(rdev)) {
	540	if (!(peer = kmalloc(sizeof(struct rionet_peer), GFP_KERNEL))) {
	541	rc = -ENOMEM;
	542	goto out;
	543	}
	544	peer->rdev = rdev;
	545	list_add_tail(&peer->node, &rionet_peers);
	546	}
	547
	548	out:
	549	return rc;
	550	}
	551
	552	static struct rio_device_id rionet_id_table[] = {
	553	{RIO_DEVICE(RIO_ANY_ID, RIO_ANY_ID)}
	554	};
	555
	556	static struct rio_driver rionet_driver = {
557	.name = "rionet",
558	.id_table = rionet_id_table,
559	.probe = rionet_probe,
560	.remove = rionet_remove,
561	};
562
563	static int __init rionet_init(void)
564	{
565	return rio_register_driver(&rionet_driver);
566	}
567
568	static void __exit rionet_exit(void)
569	{
570	rio_unregister_driver(&rionet_driver);
571	}
572
573	module_init(rionet_init);
574	module_exit(rionet_exit);