[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/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];
	struct net_device_stats stats;
	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 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[RIO_MAX_ROUTE_ENTRIES];

#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 struct net_device_stats *rionet_stats(struct net_device *ndev)
{
	struct rionet_private *rnet = ndev->priv;
	return &rnet->stats;
}

static int rionet_rx_clean(struct net_device *ndev)
{
	int i;
	int error = 0;
	struct rionet_private *rnet = ndev->priv;
	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) {
			rnet->stats.rx_dropped++;
		} else if (error == NET_RX_BAD) {
			if (netif_msg_rx_err(rnet))
				printk(KERN_WARNING "%s: bad rx packet\n",
				       DRV_NAME);
			rnet->stats.rx_errors++;
		} else {
			rnet->stats.rx_packets++;
			rnet->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 = ndev->priv;

	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 = ndev->priv;

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

	rnet->stats.tx_packets++;
	rnet->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 = ndev->priv;
	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; 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 0;
}

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 = ndev->priv;
	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 = (struct rionet_private *)ndev->priv;

	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 = ndev->priv;

	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 = ndev->priv;

	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 = (struct rionet_private *)ndev->priv;
	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++)
		if (rnet->rx_skb[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;

	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 = ndev->priv;

	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 = ndev->priv;

	return rnet->msg_enable;
}

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

	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 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;
	}

	/* Set up private area */
	rnet = (struct rionet_private *)ndev->priv;
	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;

	/* Fill in the driver function table */
	ndev->open = &rionet_open;
	ndev->hard_start_xmit = &rionet_start_xmit;
	ndev->stop = &rionet_close;
	ndev->get_stats = &rionet_stats;
	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 %02x:%02x:%02x:%02x:%02x:%02x\n",
	       ndev->name,
	       DRV_NAME,
	       DRV_DESC,
	       DRV_VERSION,
	       ndev->dev_addr[0], ndev->dev_addr[1], ndev->dev_addr[2],
	       ndev->dev_addr[3], ndev->dev_addr[4], ndev->dev_addr[5]);

      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 <[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>
	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 <[email protected]>"
	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];
	56	struct net_device_stats stats;
	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	/*
76	* This is a fast lookup table for for translating TX
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	*/
81	static struct rio_dev *rionet_active[RIO_MAX_ROUTE_ENTRIES];
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
94	static struct net_device_stats rionet_stats(struct net_device ndev)
95	{
96	struct rionet_private *rnet = ndev->priv;
97	return &rnet->stats;
98	}
99
100	static int rionet_rx_clean(struct net_device *ndev)
101	{
102	int i;
103	int error = 0;
104	struct rionet_private *rnet = ndev->priv;
105	void *data;
106
107	i = rnet->rx_slot;
108
109	do {
110	if (!rnet->rx_skb[i])
111	continue;
112
113	if (!(data = rio_get_inb_message(rnet->mport, RIONET_MAILBOX)))
114	break;
115
116	rnet->rx_skb[i]->data = data;
117	skb_put(rnet->rx_skb[i], RIO_MAX_MSG_SIZE);
f89efd52 MP	118	rnet->rx_skb[i]->protocol =
	119	eth_type_trans(rnet->rx_skb[i], ndev);
	120	error = netif_rx(rnet->rx_skb[i]);
	121
	122	if (error == NET_RX_DROP) {
	123	rnet->stats.rx_dropped++;
	124	} else if (error == NET_RX_BAD) {
	125	if (netif_msg_rx_err(rnet))
	126	printk(KERN_WARNING "%s: bad rx packet\n",
	127	DRV_NAME);
	128	rnet->stats.rx_errors++;
	129	} else {
	130	rnet->stats.rx_packets++;
	131	rnet->stats.rx_bytes += RIO_MAX_MSG_SIZE;
	132	}
	133
	134	} while ((i = (i + 1) % RIONET_RX_RING_SIZE) != rnet->rx_slot);
	135
	136	return i;
	137	}
	138
	139	static void rionet_rx_fill(struct net_device *ndev, int end)
	140	{
	141	int i;
	142	struct rionet_private *rnet = ndev->priv;
	143
	144	i = rnet->rx_slot;
	145	do {
	146	rnet->rx_skb[i] = dev_alloc_skb(RIO_MAX_MSG_SIZE);
	147
	148	if (!rnet->rx_skb[i])
	149	break;
	150
	151	rio_add_inb_buffer(rnet->mport, RIONET_MAILBOX,
	152	rnet->rx_skb[i]->data);
	153	} while ((i = (i + 1) % RIONET_RX_RING_SIZE) != end);
	154
	155	rnet->rx_slot = i;
	156	}
	157
	158	static int rionet_queue_tx_msg(struct sk_buff skb, struct net_device ndev,
	159	struct rio_dev *rdev)
	160	{
	161	struct rionet_private *rnet = ndev->priv;
	162
	163	rio_add_outb_message(rnet->mport, rdev, 0, skb->data, skb->len);
	164	rnet->tx_skb[rnet->tx_slot] = skb;
	165
	166	rnet->stats.tx_packets++;
	167	rnet->stats.tx_bytes += skb->len;
	168
	169	if (++rnet->tx_cnt == RIONET_TX_RING_SIZE)
	170	netif_stop_queue(ndev);
	171
	172	++rnet->tx_slot;
	173	rnet->tx_slot &= (RIONET_TX_RING_SIZE - 1);
	174
	175	if (netif_msg_tx_queued(rnet))
	176	printk(KERN_INFO "%s: queued skb %8.8x len %8.8x\n", DRV_NAME,
	177	(u32) skb, skb->len);
	178
	179	return 0;
	180	}
	181
182	static int rionet_start_xmit(struct sk_buff skb, struct net_device ndev)
183	{
184	int i;
185	struct rionet_private *rnet = ndev->priv;
186	struct ethhdr eth = (struct ethhdr )skb->data;
187	u16 destid;
188	unsigned long flags;
189
190	local_irq_save(flags);
191	if (!spin_trylock(&rnet->tx_lock)) {
192	local_irq_restore(flags);
193	return NETDEV_TX_LOCKED;
194	}
195
196	if ((rnet->tx_cnt + 1) > RIONET_TX_RING_SIZE) {
197	netif_stop_queue(ndev);
198	spin_unlock_irqrestore(&rnet->tx_lock, flags);
199	printk(KERN_ERR "%s: BUG! Tx Ring full when queue awake!\n",
200	ndev->name);
201	return NETDEV_TX_BUSY;
202	}
203
204	if (eth->h_dest[0] & 0x01) {
205	for (i = 0; i < RIO_MAX_ROUTE_ENTRIES; i++)
206	if (rionet_active[i])
207	rionet_queue_tx_msg(skb, ndev,
208	rionet_active[i]);
209	} else if (RIONET_MAC_MATCH(eth->h_dest)) {
210	destid = RIONET_GET_DESTID(eth->h_dest);
211	if (rionet_active[destid])
212	rionet_queue_tx_msg(skb, ndev, rionet_active[destid]);
213	}
214
215	spin_unlock_irqrestore(&rnet->tx_lock, flags);
216
217	return 0;
218	}
219
220	static void rionet_dbell_event(struct rio_mport mport, void dev_id, u16 sid, u16 tid,
221	u16 info)
222	{
223	struct net_device *ndev = dev_id;
224	struct rionet_private *rnet = ndev->priv;
225	struct rionet_peer *peer;
226
227	if (netif_msg_intr(rnet))
228	printk(KERN_INFO "%s: doorbell sid %4.4x tid %4.4x info %4.4x",
229	DRV_NAME, sid, tid, info);
230	if (info == RIONET_DOORBELL_JOIN) {
231	if (!rionet_active[sid]) {
232	list_for_each_entry(peer, &rionet_peers, node) {
233	if (peer->rdev->destid == sid)
234	rionet_active[sid] = peer->rdev;
235	}
236	rio_mport_send_doorbell(mport, sid,
237	RIONET_DOORBELL_JOIN);
238	}
239	} else if (info == RIONET_DOORBELL_LEAVE) {
240	rionet_active[sid] = NULL;
241	} else {
242	if (netif_msg_intr(rnet))
243	printk(KERN_WARNING "%s: unhandled doorbell\n",
244	DRV_NAME);
245	}
246	}
247
248	static void rionet_inb_msg_event(struct rio_mport mport, void dev_id, int mbox, int slot)
249	{
250	int n;
251	struct net_device *ndev = dev_id;
252	struct rionet_private rnet = (struct rionet_private )ndev->priv;
253
254	if (netif_msg_intr(rnet))
255	printk(KERN_INFO "%s: inbound message event, mbox %d slot %d\n",
256	DRV_NAME, mbox, slot);
257
258	spin_lock(&rnet->lock);
259	if ((n = rionet_rx_clean(ndev)) != rnet->rx_slot)
260	rionet_rx_fill(ndev, n);
261	spin_unlock(&rnet->lock);
262	}
263
264	static void rionet_outb_msg_event(struct rio_mport mport, void dev_id, int mbox, int slot)
265	{
266	struct net_device *ndev = dev_id;
267	struct rionet_private *rnet = ndev->priv;
268
269	spin_lock(&rnet->lock);
270
271	if (netif_msg_intr(rnet))
272	printk(KERN_INFO
273	"%s: outbound message event, mbox %d slot %d\n",
274	DRV_NAME, mbox, slot);
275
276	while (rnet->tx_cnt && (rnet->ack_slot != slot)) {
277	/* dma unmap single */
278	dev_kfree_skb_irq(rnet->tx_skb[rnet->ack_slot]);
279	rnet->tx_skb[rnet->ack_slot] = NULL;
280	++rnet->ack_slot;
281	rnet->ack_slot &= (RIONET_TX_RING_SIZE - 1);
282	rnet->tx_cnt--;
283	}
284
285	if (rnet->tx_cnt < RIONET_TX_RING_SIZE)
286	netif_wake_queue(ndev);
287
288	spin_unlock(&rnet->lock);
289	}
290
291	static int rionet_open(struct net_device *ndev)
292	{
293	int i, rc = 0;
294	struct rionet_peer peer, tmp;
295	u32 pwdcsr;
296	struct rionet_private *rnet = ndev->priv;
297
298	if (netif_msg_ifup(rnet))
299	printk(KERN_INFO "%s: open\n", DRV_NAME);
300
301	if ((rc = rio_request_inb_dbell(rnet->mport,
302	(void *)ndev,
303	RIONET_DOORBELL_JOIN,
304	RIONET_DOORBELL_LEAVE,
305	rionet_dbell_event)) < 0)
306	goto out;
307
308	if ((rc = rio_request_inb_mbox(rnet->mport,
309	(void *)ndev,
310	RIONET_MAILBOX,
311	RIONET_RX_RING_SIZE,
312	rionet_inb_msg_event)) < 0)
313	goto out;
314
315	if ((rc = rio_request_outb_mbox(rnet->mport,
316	(void *)ndev,
317	RIONET_MAILBOX,
318	RIONET_TX_RING_SIZE,
319	rionet_outb_msg_event)) < 0)
320	goto out;
321
322	/* Initialize inbound message ring */
323	for (i = 0; i < RIONET_RX_RING_SIZE; i++)
324	rnet->rx_skb[i] = NULL;
325	rnet->rx_slot = 0;
326	rionet_rx_fill(ndev, 0);
327
328	rnet->tx_slot = 0;
329	rnet->tx_cnt = 0;
330	rnet->ack_slot = 0;
331
332	netif_carrier_on(ndev);
333	netif_start_queue(ndev);
334
335	list_for_each_entry_safe(peer, tmp, &rionet_peers, node) {
336	if (!(peer->res = rio_request_outb_dbell(peer->rdev,
337	RIONET_DOORBELL_JOIN,
338	RIONET_DOORBELL_LEAVE)))
339	{
340	printk(KERN_ERR "%s: error requesting doorbells\n",
341	DRV_NAME);
342	continue;
343	}
344
345	/*
346	* If device has initialized inbound doorbells,
347	* send a join message
348	*/
349	rio_read_config_32(peer->rdev, RIO_WRITE_PORT_CSR, &pwdcsr);
350	if (pwdcsr & RIO_DOORBELL_AVAIL)
351	rio_send_doorbell(peer->rdev, RIONET_DOORBELL_JOIN);
352	}
353
354	out:
355	return rc;
356	}
357
358	static int rionet_close(struct net_device *ndev)
359	{
360	struct rionet_private rnet = (struct rionet_private )ndev->priv;
361	struct rionet_peer peer, tmp;
362	int i;
363
364	if (netif_msg_ifup(rnet))
365	printk(KERN_INFO "%s: close\n", DRV_NAME);
366
367	netif_stop_queue(ndev);
368	netif_carrier_off(ndev);
369
370	for (i = 0; i < RIONET_RX_RING_SIZE; i++)
371	if (rnet->rx_skb[i])
372	kfree_skb(rnet->rx_skb[i]);
373
374	list_for_each_entry_safe(peer, tmp, &rionet_peers, node) {
375	if (rionet_active[peer->rdev->destid]) {
376	rio_send_doorbell(peer->rdev, RIONET_DOORBELL_LEAVE);
377	rionet_active[peer->rdev->destid] = NULL;
378	}
379	rio_release_outb_dbell(peer->rdev, peer->res);
380	}
381
382	rio_release_inb_dbell(rnet->mport, RIONET_DOORBELL_JOIN,
383	RIONET_DOORBELL_LEAVE);
384	rio_release_inb_mbox(rnet->mport, RIONET_MAILBOX);
385	rio_release_outb_mbox(rnet->mport, RIONET_MAILBOX);
386
387	return 0;
388	}
389
390	static void rionet_remove(struct rio_dev *rdev)
391	{
392	struct net_device *ndev = NULL;
393	struct rionet_peer peer, tmp;
394
395	unregister_netdev(ndev);
396	kfree(ndev);
397
398	list_for_each_entry_safe(peer, tmp, &rionet_peers, node) {
399	list_del(&peer->node);
400	kfree(peer);
401	}
402	}
403
404	static void rionet_get_drvinfo(struct net_device *ndev,
405	struct ethtool_drvinfo *info)
406	{
407	struct rionet_private *rnet = ndev->priv;
408
409	strcpy(info->driver, DRV_NAME);
410	strcpy(info->version, DRV_VERSION);
411	strcpy(info->fw_version, "n/a");
412	strcpy(info->bus_info, rnet->mport->name);
413	}
414
415	static u32 rionet_get_msglevel(struct net_device *ndev)
416	{
417	struct rionet_private *rnet = ndev->priv;
418
419	return rnet->msg_enable;
420	}
421
422	static void rionet_set_msglevel(struct net_device *ndev, u32 value)
423	{
424	struct rionet_private *rnet = ndev->priv;
425
426	rnet->msg_enable = value;
427	}
428
7282d491	429	static const struct ethtool_ops rionet_ethtool_ops = {
f89efd52 MP	430	.get_drvinfo = rionet_get_drvinfo,
	431	.get_msglevel = rionet_get_msglevel,
	432	.set_msglevel = rionet_set_msglevel,
	433	.get_link = ethtool_op_get_link,
	434	};
	435
	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
	452	/* Set up private area */
	453	rnet = (struct rionet_private *)ndev->priv;
	454	rnet->mport = mport;
	455
	456	/* Set the default MAC address */
	457	device_id = rio_local_get_device_id(mport);
	458	ndev->dev_addr[0] = 0x00;
	459	ndev->dev_addr[1] = 0x01;
	460	ndev->dev_addr[2] = 0x00;
	461	ndev->dev_addr[3] = 0x01;
	462	ndev->dev_addr[4] = device_id >> 8;
	463	ndev->dev_addr[5] = device_id & 0xff;
	464
	465	/* Fill in the driver function table */
	466	ndev->open = &rionet_open;
	467	ndev->hard_start_xmit = &rionet_start_xmit;
	468	ndev->stop = &rionet_close;
	469	ndev->get_stats = &rionet_stats;
	470	ndev->mtu = RIO_MAX_MSG_SIZE - 14;
	471	ndev->features = NETIF_F_LLTX;
	472	SET_ETHTOOL_OPS(ndev, &rionet_ethtool_ops);
	473
f89efd52 MP	474	spin_lock_init(&rnet->lock);
	475	spin_lock_init(&rnet->tx_lock);
	476
	477	rnet->msg_enable = RIONET_DEFAULT_MSGLEVEL;
	478
	479	rc = register_netdev(ndev);
	480	if (rc != 0)
	481	goto out;
	482
	483	printk("%s: %s %s Version %s, MAC %02x:%02x:%02x:%02x:%02x:%02x\n",
	484	ndev->name,
	485	DRV_NAME,
	486	DRV_DESC,
	487	DRV_VERSION,
	488	ndev->dev_addr[0], ndev->dev_addr[1], ndev->dev_addr[2],
	489	ndev->dev_addr[3], ndev->dev_addr[4], ndev->dev_addr[5]);
	490
	491	out:
	492	return rc;
	493	}
	494
	495	/*
	496	* XXX Make multi-net safe
	497	*/
	498	static int rionet_probe(struct rio_dev rdev, const struct rio_device_id id)
	499	{
	500	int rc = -ENODEV;
	501	u32 lpef, lsrc_ops, ldst_ops;
	502	struct rionet_peer *peer;
	503
	504	/* If local device is not rionet capable, give up quickly */
	505	if (!rionet_capable)
	506	goto out;
	507
	508	/*
	509	* First time through, make sure local device is rionet
	510	* capable, setup netdev, and set flags so this is skipped
	511	* on later probes
	512	*/
	513	if (!rionet_check) {
	514	rio_local_read_config_32(rdev->net->hport, RIO_PEF_CAR, &lpef);
	515	rio_local_read_config_32(rdev->net->hport, RIO_SRC_OPS_CAR,
	516	&lsrc_ops);
	517	rio_local_read_config_32(rdev->net->hport, RIO_DST_OPS_CAR,
	518	&ldst_ops);
	519	if (!is_rionet_capable(lpef, lsrc_ops, ldst_ops)) {
	520	printk(KERN_ERR
	521	"%s: local device is not network capable\n",
	522	DRV_NAME);
	523	rionet_check = 1;
	524	rionet_capable = 0;
	525	goto out;
	526	}
	527
	528	rc = rionet_setup_netdev(rdev->net->hport);
	529	rionet_check = 1;
	530	}
	531
	532	/*
	533	* If the remote device has mailbox/doorbell capabilities,
	534	* add it to the peer list.
	535	*/
	536	if (dev_rionet_capable(rdev)) {
	537	if (!(peer = kmalloc(sizeof(struct rionet_peer), GFP_KERNEL))) {
538	rc = -ENOMEM;
539	goto out;
540	}
541	peer->rdev = rdev;
542	list_add_tail(&peer->node, &rionet_peers);
543	}
544
545	out:
546	return rc;
547	}
548
549	static struct rio_device_id rionet_id_table[] = {
550	{RIO_DEVICE(RIO_ANY_ID, RIO_ANY_ID)}
551	};
552
553	static struct rio_driver rionet_driver = {
554	.name = "rionet",
555	.id_table = rionet_id_table,
556	.probe = rionet_probe,
557	.remove = rionet_remove,
558	};
559
560	static int __init rionet_init(void)
561	{
562	return rio_register_driver(&rionet_driver);
563	}
564
565	static void __exit rionet_exit(void)
566	{
567	rio_unregister_driver(&rionet_driver);
568	}
569
570	module_init(rionet_init);
571	module_exit(rionet_exit);