[mirror_ubuntu-bionic-kernel.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/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 <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;
static int nact;	/* total number of active rionet peers */

#define is_rionet_capable(src_ops, dst_ops)			\
			((src_ops & RIO_SRC_OPS_DATA_MSG) &&	\
			 (dst_ops & RIO_DST_OPS_DATA_MSG) &&	\
			 (src_ops & RIO_SRC_OPS_DOORBELL) &&	\
			 (dst_ops & RIO_DST_OPS_DOORBELL))
#define dev_rionet_capable(dev) \
	is_rionet_capable(dev->src_ops, dev->dst_ops)

#define RIONET_MAC_MATCH(x)	(!memcmp((x), "\00\01\00\01", 4))
#define RIONET_GET_DESTID(x)	((*((u8 *)x + 4) << 8) | *((u8 *)x + 5))

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 len %8.8x\n", DRV_NAME,
		       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;
	int add_num = 1;

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

	if (is_multicast_ether_addr(eth->h_dest))
		add_num = nact;

	if ((rnet->tx_cnt + add_num) > 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 (is_multicast_ether_addr(eth->h_dest)) {
		int count = 0;
		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]);
				if (count)
					atomic_inc(&skb->users);
				count++;
			}
	} 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;
					nact++;
				}
			}
			rio_mport_send_doorbell(mport, sid,
						RIONET_DOORBELL_JOIN);
		}
	} else if (info == RIONET_DOORBELL_LEAVE) {
		rionet_active[sid] = NULL;
		nact--;
	} 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;
	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;
		}

		/* Send a join message */
		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 = rio_get_drvdata(rdev);
	struct rionet_peer *peer, *tmp;

	free_pages((unsigned long)rionet_active, get_order(sizeof(void *) *
			RIO_MAX_ROUTE_ENTRIES(rdev->net->hport->sys_size)));
	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, struct net_device *ndev)
{
	int rc = 0;
	struct rionet_private *rnet;
	u16 device_id;
	const size_t rionet_active_bytes = sizeof(void *) *
				RIO_MAX_ROUTE_ENTRIES(mport->sys_size);

	rionet_active = (struct rio_dev **)__get_free_pages(GFP_KERNEL,
			get_order(rionet_active_bytes));
	if (!rionet_active) {
		rc = -ENOMEM;
		goto out;
	}
	memset((void *)rionet_active, 0, rionet_active_bytes);

	/* 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 lsrc_ops, ldst_ops;
	struct rionet_peer *peer;
	struct net_device *ndev = NULL;

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

	/* Allocate our net_device structure */
	ndev = alloc_etherdev(sizeof(struct rionet_private));
	if (ndev == NULL) {
		rc = -ENOMEM;
		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_SRC_OPS_CAR,
					 &lsrc_ops);
		rio_local_read_config_32(rdev->net->hport, RIO_DST_OPS_CAR,
					 &ldst_ops);
		if (!is_rionet_capable(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, ndev);
		rionet_check = 1;
		nact = 0;
	}

	/*
	 * 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);
	}

	rio_set_drvdata(rdev, ndev);

      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 <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>
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 <mporter@kernel.crashing.org>"
	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;
7c4a6106	82	static int nact; /* total number of active rionet peers */
f89efd52	83
284fb68d AB	84	#define is_rionet_capable(src_ops, dst_ops) \
	85	((src_ops & RIO_SRC_OPS_DATA_MSG) && \
	86	(dst_ops & RIO_DST_OPS_DATA_MSG) && \
f89efd52 MP	87	(src_ops & RIO_SRC_OPS_DOORBELL) && \
	88	(dst_ops & RIO_DST_OPS_DOORBELL))
	89	#define dev_rionet_capable(dev) \
284fb68d	90	is_rionet_capable(dev->src_ops, dev->dst_ops)
f89efd52	91
e0c87bd9 AB	92	#define RIONET_MAC_MATCH(x) (!memcmp((x), "\00\01\00\01", 4))
e0c87bd9 AB	93	#define RIONET_GET_DESTID(x) ((((u8 )x + 4) << 8) \| ((u8 )x + 5))
f89efd52	94
f89efd52 MP	95	static int rionet_rx_clean(struct net_device *ndev)
	96	{
	97	int i;
	98	int error = 0;
4cf1653a	99	struct rionet_private *rnet = netdev_priv(ndev);
f89efd52 MP	100	void *data;
	101
	102	i = rnet->rx_slot;
	103
	104	do {
	105	if (!rnet->rx_skb[i])
	106	continue;
	107
	108	if (!(data = rio_get_inb_message(rnet->mport, RIONET_MAILBOX)))
	109	break;
	110
	111	rnet->rx_skb[i]->data = data;
	112	skb_put(rnet->rx_skb[i], RIO_MAX_MSG_SIZE);
f89efd52 MP	113	rnet->rx_skb[i]->protocol =
	114	eth_type_trans(rnet->rx_skb[i], ndev);
	115	error = netif_rx(rnet->rx_skb[i]);
	116
	117	if (error == NET_RX_DROP) {
09f75cd7	118	ndev->stats.rx_dropped++;
f89efd52	119	} else {
09f75cd7 JG	120	ndev->stats.rx_packets++;
09f75cd7 JG	121	ndev->stats.rx_bytes += RIO_MAX_MSG_SIZE;
f89efd52 MP	122	}
	123
	124	} while ((i = (i + 1) % RIONET_RX_RING_SIZE) != rnet->rx_slot);
	125
	126	return i;
	127	}
	128
	129	static void rionet_rx_fill(struct net_device *ndev, int end)
	130	{
	131	int i;
4cf1653a	132	struct rionet_private *rnet = netdev_priv(ndev);
f89efd52 MP	133
	134	i = rnet->rx_slot;
	135	do {
	136	rnet->rx_skb[i] = dev_alloc_skb(RIO_MAX_MSG_SIZE);
	137
	138	if (!rnet->rx_skb[i])
	139	break;
	140
	141	rio_add_inb_buffer(rnet->mport, RIONET_MAILBOX,
	142	rnet->rx_skb[i]->data);
	143	} while ((i = (i + 1) % RIONET_RX_RING_SIZE) != end);
	144
	145	rnet->rx_slot = i;
	146	}
	147
	148	static int rionet_queue_tx_msg(struct sk_buff skb, struct net_device ndev,
	149	struct rio_dev *rdev)
	150	{
4cf1653a	151	struct rionet_private *rnet = netdev_priv(ndev);
f89efd52 MP	152
	153	rio_add_outb_message(rnet->mport, rdev, 0, skb->data, skb->len);
	154	rnet->tx_skb[rnet->tx_slot] = skb;
	155
09f75cd7 JG	156	ndev->stats.tx_packets++;
09f75cd7 JG	157	ndev->stats.tx_bytes += skb->len;
f89efd52 MP	158
	159	if (++rnet->tx_cnt == RIONET_TX_RING_SIZE)
	160	netif_stop_queue(ndev);
	161
	162	++rnet->tx_slot;
	163	rnet->tx_slot &= (RIONET_TX_RING_SIZE - 1);
	164
	165	if (netif_msg_tx_queued(rnet))
8df8a475 DM	166	printk(KERN_INFO "%s: queued skb len %8.8x\n", DRV_NAME,
8df8a475 DM	167	skb->len);
f89efd52 MP	168
	169	return 0;
	170	}
	171
	172	static int rionet_start_xmit(struct sk_buff skb, struct net_device ndev)
	173	{
	174	int i;
4cf1653a	175	struct rionet_private *rnet = netdev_priv(ndev);
f89efd52 MP	176	struct ethhdr eth = (struct ethhdr )skb->data;
	177	u16 destid;
	178	unsigned long flags;
7c4a6106	179	int add_num = 1;
f89efd52 MP	180
	181	local_irq_save(flags);
	182	if (!spin_trylock(&rnet->tx_lock)) {
	183	local_irq_restore(flags);
	184	return NETDEV_TX_LOCKED;
	185	}
	186
7c4a6106 AB	187	if (is_multicast_ether_addr(eth->h_dest))
	188	add_num = nact;
	189
	190	if ((rnet->tx_cnt + add_num) > RIONET_TX_RING_SIZE) {
f89efd52 MP	191	netif_stop_queue(ndev);
	192	spin_unlock_irqrestore(&rnet->tx_lock, flags);
	193	printk(KERN_ERR "%s: BUG! Tx Ring full when queue awake!\n",
	194	ndev->name);
	195	return NETDEV_TX_BUSY;
	196	}
	197
abfc89c7	198	if (is_multicast_ether_addr(eth->h_dest)) {
7c4a6106	199	int count = 0;
e0423236 ZW	200	for (i = 0; i < RIO_MAX_ROUTE_ENTRIES(rnet->mport->sys_size);
e0423236 ZW	201	i++)
7c4a6106	202	if (rionet_active[i]) {
f89efd52 MP	203	rionet_queue_tx_msg(skb, ndev,
f89efd52 MP	204	rionet_active[i]);
7c4a6106 AB	205	if (count)
	206	atomic_inc(&skb->users);
	207	count++;
	208	}
f89efd52 MP	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
6ed10654	217	return NETDEV_TX_OK;
f89efd52 MP	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;
4cf1653a	224	struct rionet_private *rnet = netdev_priv(ndev);
f89efd52 MP	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) {
7c4a6106	233	if (peer->rdev->destid == sid) {
f89efd52	234	rionet_active[sid] = peer->rdev;
7c4a6106 AB	235	nact++;
7c4a6106 AB	236	}
f89efd52 MP	237	}
	238	rio_mport_send_doorbell(mport, sid,
	239	RIONET_DOORBELL_JOIN);
	240	}
	241	} else if (info == RIONET_DOORBELL_LEAVE) {
	242	rionet_active[sid] = NULL;
7c4a6106	243	nact--;
f89efd52 MP	244	} else {
	245	if (netif_msg_intr(rnet))
	246	printk(KERN_WARNING "%s: unhandled doorbell\n",
	247	DRV_NAME);
	248	}
	249	}
	250
	251	static void rionet_inb_msg_event(struct rio_mport mport, void dev_id, int mbox, int slot)
	252	{
	253	int n;
	254	struct net_device *ndev = dev_id;
4cf1653a	255	struct rionet_private *rnet = netdev_priv(ndev);
f89efd52 MP	256
	257	if (netif_msg_intr(rnet))
	258	printk(KERN_INFO "%s: inbound message event, mbox %d slot %d\n",
	259	DRV_NAME, mbox, slot);
	260
	261	spin_lock(&rnet->lock);
	262	if ((n = rionet_rx_clean(ndev)) != rnet->rx_slot)
	263	rionet_rx_fill(ndev, n);
	264	spin_unlock(&rnet->lock);
	265	}
	266
	267	static void rionet_outb_msg_event(struct rio_mport mport, void dev_id, int mbox, int slot)
	268	{
	269	struct net_device *ndev = dev_id;
4cf1653a	270	struct rionet_private *rnet = netdev_priv(ndev);
f89efd52 MP	271
	272	spin_lock(&rnet->lock);
	273
	274	if (netif_msg_intr(rnet))
	275	printk(KERN_INFO
	276	"%s: outbound message event, mbox %d slot %d\n",
	277	DRV_NAME, mbox, slot);
	278
	279	while (rnet->tx_cnt && (rnet->ack_slot != slot)) {
	280	/* dma unmap single */
	281	dev_kfree_skb_irq(rnet->tx_skb[rnet->ack_slot]);
	282	rnet->tx_skb[rnet->ack_slot] = NULL;
	283	++rnet->ack_slot;
	284	rnet->ack_slot &= (RIONET_TX_RING_SIZE - 1);
	285	rnet->tx_cnt--;
	286	}
	287
	288	if (rnet->tx_cnt < RIONET_TX_RING_SIZE)
	289	netif_wake_queue(ndev);
	290
	291	spin_unlock(&rnet->lock);
	292	}
	293
	294	static int rionet_open(struct net_device *ndev)
	295	{
	296	int i, rc = 0;
	297	struct rionet_peer peer, tmp;
4cf1653a	298	struct rionet_private *rnet = netdev_priv(ndev);
f89efd52 MP	299
	300	if (netif_msg_ifup(rnet))
	301	printk(KERN_INFO "%s: open\n", DRV_NAME);
	302
	303	if ((rc = rio_request_inb_dbell(rnet->mport,
	304	(void *)ndev,
	305	RIONET_DOORBELL_JOIN,
	306	RIONET_DOORBELL_LEAVE,
	307	rionet_dbell_event)) < 0)
	308	goto out;
	309
	310	if ((rc = rio_request_inb_mbox(rnet->mport,
	311	(void *)ndev,
	312	RIONET_MAILBOX,
	313	RIONET_RX_RING_SIZE,
	314	rionet_inb_msg_event)) < 0)
	315	goto out;
	316
	317	if ((rc = rio_request_outb_mbox(rnet->mport,
	318	(void *)ndev,
	319	RIONET_MAILBOX,
	320	RIONET_TX_RING_SIZE,
	321	rionet_outb_msg_event)) < 0)
	322	goto out;
	323
	324	/* Initialize inbound message ring */
	325	for (i = 0; i < RIONET_RX_RING_SIZE; i++)
	326	rnet->rx_skb[i] = NULL;
	327	rnet->rx_slot = 0;
	328	rionet_rx_fill(ndev, 0);
	329
	330	rnet->tx_slot = 0;
	331	rnet->tx_cnt = 0;
	332	rnet->ack_slot = 0;
	333
	334	netif_carrier_on(ndev);
	335	netif_start_queue(ndev);
	336
	337	list_for_each_entry_safe(peer, tmp, &rionet_peers, node) {
	338	if (!(peer->res = rio_request_outb_dbell(peer->rdev,
	339	RIONET_DOORBELL_JOIN,
	340	RIONET_DOORBELL_LEAVE)))
	341	{
	342	printk(KERN_ERR "%s: error requesting doorbells\n",
	343	DRV_NAME);
	344	continue;
	345	}
	346
284fb68d AB	347	/* Send a join message */
284fb68d AB	348	rio_send_doorbell(peer->rdev, RIONET_DOORBELL_JOIN);
f89efd52 MP	349	}
	350
	351	out:
	352	return rc;
	353	}
	354
	355	static int rionet_close(struct net_device *ndev)
	356	{
4cf1653a	357	struct rionet_private *rnet = netdev_priv(ndev);
f89efd52 MP	358	struct rionet_peer peer, tmp;
	359	int i;
	360
	361	if (netif_msg_ifup(rnet))
	362	printk(KERN_INFO "%s: close\n", DRV_NAME);
	363
	364	netif_stop_queue(ndev);
	365	netif_carrier_off(ndev);
	366
	367	for (i = 0; i < RIONET_RX_RING_SIZE; i++)
aaff1e19	368	kfree_skb(rnet->rx_skb[i]);
f89efd52 MP	369
	370	list_for_each_entry_safe(peer, tmp, &rionet_peers, node) {
	371	if (rionet_active[peer->rdev->destid]) {
	372	rio_send_doorbell(peer->rdev, RIONET_DOORBELL_LEAVE);
	373	rionet_active[peer->rdev->destid] = NULL;
	374	}
	375	rio_release_outb_dbell(peer->rdev, peer->res);
	376	}
	377
	378	rio_release_inb_dbell(rnet->mport, RIONET_DOORBELL_JOIN,
	379	RIONET_DOORBELL_LEAVE);
	380	rio_release_inb_mbox(rnet->mport, RIONET_MAILBOX);
	381	rio_release_outb_mbox(rnet->mport, RIONET_MAILBOX);
	382
	383	return 0;
	384	}
	385
	386	static void rionet_remove(struct rio_dev *rdev)
	387	{
55caa924	388	struct net_device *ndev = rio_get_drvdata(rdev);
f89efd52 MP	389	struct rionet_peer peer, tmp;
f89efd52 MP	390
acc65632 AM	391	free_pages((unsigned long)rionet_active, get_order(sizeof(void )
acc65632 AM	392	RIO_MAX_ROUTE_ENTRIES(rdev->net->hport->sys_size)));
f89efd52	393	unregister_netdev(ndev);
22138d30	394	free_netdev(ndev);
f89efd52 MP	395
	396	list_for_each_entry_safe(peer, tmp, &rionet_peers, node) {
	397	list_del(&peer->node);
	398	kfree(peer);
	399	}
	400	}
	401
	402	static void rionet_get_drvinfo(struct net_device *ndev,
	403	struct ethtool_drvinfo *info)
	404	{
4cf1653a	405	struct rionet_private *rnet = netdev_priv(ndev);
f89efd52 MP	406
	407	strcpy(info->driver, DRV_NAME);
	408	strcpy(info->version, DRV_VERSION);
	409	strcpy(info->fw_version, "n/a");
	410	strcpy(info->bus_info, rnet->mport->name);
	411	}
	412
	413	static u32 rionet_get_msglevel(struct net_device *ndev)
	414	{
4cf1653a	415	struct rionet_private *rnet = netdev_priv(ndev);
f89efd52 MP	416
	417	return rnet->msg_enable;
	418	}
	419
	420	static void rionet_set_msglevel(struct net_device *ndev, u32 value)
	421	{
4cf1653a	422	struct rionet_private *rnet = netdev_priv(ndev);
f89efd52 MP	423
	424	rnet->msg_enable = value;
	425	}
	426
7282d491	427	static const struct ethtool_ops rionet_ethtool_ops = {
f89efd52 MP	428	.get_drvinfo = rionet_get_drvinfo,
	429	.get_msglevel = rionet_get_msglevel,
	430	.set_msglevel = rionet_set_msglevel,
	431	.get_link = ethtool_op_get_link,
	432	};
	433
a33a2bb3 AB	434	static const struct net_device_ops rionet_netdev_ops = {
	435	.ndo_open = rionet_open,
	436	.ndo_stop = rionet_close,
	437	.ndo_start_xmit = rionet_start_xmit,
	438	.ndo_change_mtu = eth_change_mtu,
	439	.ndo_validate_addr = eth_validate_addr,
	440	.ndo_set_mac_address = eth_mac_addr,
	441	};
	442
55caa924	443	static int rionet_setup_netdev(struct rio_mport mport, struct net_device ndev)
f89efd52 MP	444	{
f89efd52 MP	445	int rc = 0;
f89efd52 MP	446	struct rionet_private *rnet;
f89efd52 MP	447	u16 device_id;
acc65632 AM	448	const size_t rionet_active_bytes = sizeof(void )
acc65632 AM	449	RIO_MAX_ROUTE_ENTRIES(mport->sys_size);
f89efd52	450
e0423236	451	rionet_active = (struct rio_dev **)__get_free_pages(GFP_KERNEL,
acc65632	452	get_order(rionet_active_bytes));
e0423236 ZW	453	if (!rionet_active) {
	454	rc = -ENOMEM;
	455	goto out;
	456	}
acc65632	457	memset((void *)rionet_active, 0, rionet_active_bytes);
e0423236	458
f89efd52	459	/* Set up private area */
4cf1653a	460	rnet = netdev_priv(ndev);
f89efd52 MP	461	rnet->mport = mport;
	462
	463	/* Set the default MAC address */
	464	device_id = rio_local_get_device_id(mport);
	465	ndev->dev_addr[0] = 0x00;
	466	ndev->dev_addr[1] = 0x01;
	467	ndev->dev_addr[2] = 0x00;
	468	ndev->dev_addr[3] = 0x01;
	469	ndev->dev_addr[4] = device_id >> 8;
	470	ndev->dev_addr[5] = device_id & 0xff;
	471
a33a2bb3	472	ndev->netdev_ops = &rionet_netdev_ops;
f89efd52 MP	473	ndev->mtu = RIO_MAX_MSG_SIZE - 14;
	474	ndev->features = NETIF_F_LLTX;
	475	SET_ETHTOOL_OPS(ndev, &rionet_ethtool_ops);
	476
f89efd52 MP	477	spin_lock_init(&rnet->lock);
	478	spin_lock_init(&rnet->tx_lock);
	479
	480	rnet->msg_enable = RIONET_DEFAULT_MSGLEVEL;
	481
	482	rc = register_netdev(ndev);
	483	if (rc != 0)
	484	goto out;
	485
e174961c	486	printk("%s: %s %s Version %s, MAC %pM\n",
f89efd52 MP	487	ndev->name,
	488	DRV_NAME,
	489	DRV_DESC,
	490	DRV_VERSION,
e174961c	491	ndev->dev_addr);
f89efd52 MP	492
	493	out:
	494	return rc;
	495	}
	496
	497	/*
	498	* XXX Make multi-net safe
	499	*/
	500	static int rionet_probe(struct rio_dev rdev, const struct rio_device_id id)
	501	{
	502	int rc = -ENODEV;
284fb68d	503	u32 lsrc_ops, ldst_ops;
f89efd52	504	struct rionet_peer *peer;
55caa924	505	struct net_device *ndev = NULL;
f89efd52 MP	506
	507	/* If local device is not rionet capable, give up quickly */
	508	if (!rionet_capable)
	509	goto out;
	510
55caa924 YL	511	/* Allocate our net_device structure */
	512	ndev = alloc_etherdev(sizeof(struct rionet_private));
	513	if (ndev == NULL) {
55caa924 YL	514	rc = -ENOMEM;
	515	goto out;
	516	}
	517
f89efd52 MP	518	/*
	519	* First time through, make sure local device is rionet
	520	* capable, setup netdev, and set flags so this is skipped
	521	* on later probes
	522	*/
	523	if (!rionet_check) {
f89efd52 MP	524	rio_local_read_config_32(rdev->net->hport, RIO_SRC_OPS_CAR,
	525	&lsrc_ops);
	526	rio_local_read_config_32(rdev->net->hport, RIO_DST_OPS_CAR,
	527	&ldst_ops);
284fb68d	528	if (!is_rionet_capable(lsrc_ops, ldst_ops)) {
f89efd52 MP	529	printk(KERN_ERR
	530	"%s: local device is not network capable\n",
	531	DRV_NAME);
	532	rionet_check = 1;
	533	rionet_capable = 0;
	534	goto out;
	535	}
	536
55caa924	537	rc = rionet_setup_netdev(rdev->net->hport, ndev);
f89efd52	538	rionet_check = 1;
7c4a6106	539	nact = 0;
f89efd52 MP	540	}
	541
	542	/*
	543	* If the remote device has mailbox/doorbell capabilities,
	544	* add it to the peer list.
	545	*/
	546	if (dev_rionet_capable(rdev)) {
	547	if (!(peer = kmalloc(sizeof(struct rionet_peer), GFP_KERNEL))) {
	548	rc = -ENOMEM;
	549	goto out;
	550	}
	551	peer->rdev = rdev;
	552	list_add_tail(&peer->node, &rionet_peers);
	553	}
	554
55caa924 YL	555	rio_set_drvdata(rdev, ndev);
55caa924 YL	556
f89efd52 MP	557	out:
	558	return rc;
	559	}
	560
	561	static struct rio_device_id rionet_id_table[] = {
	562	{RIO_DEVICE(RIO_ANY_ID, RIO_ANY_ID)}
	563	};
	564
	565	static struct rio_driver rionet_driver = {
	566	.name = "rionet",
	567	.id_table = rionet_id_table,
	568	.probe = rionet_probe,
	569	.remove = rionet_remove,
	570	};
	571
	572	static int __init rionet_init(void)
	573	{
	574	return rio_register_driver(&rionet_driver);
	575	}
	576
	577	static void __exit rionet_exit(void)
	578	{
	579	rio_unregister_driver(&rionet_driver);
	580	}
	581
2f809985	582	late_initcall(rionet_init);
f89efd52	583	module_exit(rionet_exit);