[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     "0.3"
#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
#define RIONET_MAX_NETS		8
#define RIONET_MSG_SIZE         RIO_MAX_MSG_SIZE
#define RIONET_MAX_MTU          (RIONET_MSG_SIZE - ETH_HLEN)

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;
};

struct rionet_net {
	struct net_device *ndev;
	struct list_head peers;
	struct rio_dev **active;
	int nact;	/* number of active peers */
};

static struct rionet_net nets[RIONET_MAX_NETS];

#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 = nets[rnet->mport->id].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 (nets[rnet->mport->id].active[i]) {
				rionet_queue_tx_msg(skb, ndev,
					nets[rnet->mport->id].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 (nets[rnet->mport->id].active[destid])
			rionet_queue_tx_msg(skb, ndev,
					nets[rnet->mport->id].active[destid]);
		else {
			/*
			 * If the target device was removed from the list of
			 * active peers but we still have TX packets targeting
			 * it just report sending a packet to the target
			 * (without actual packet transfer).
			 */
			dev_kfree_skb_any(skb);
			ndev->stats.tx_packets++;
			ndev->stats.tx_bytes += skb->len;
		}
	}

	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 (!nets[rnet->mport->id].active[sid]) {
			list_for_each_entry(peer,
					   &nets[rnet->mport->id].peers, node) {
				if (peer->rdev->destid == sid) {
					nets[rnet->mport->id].active[sid] =
								peer->rdev;
					nets[rnet->mport->id].nact++;
				}
			}
			rio_mport_send_doorbell(mport, sid,
						RIONET_DOORBELL_JOIN);
		}
	} else if (info == RIONET_DOORBELL_LEAVE) {
		nets[rnet->mport->id].active[sid] = NULL;
		nets[rnet->mport->id].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->tx_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->tx_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,
				 &nets[rnet->mport->id].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 %s\n", DRV_NAME, ndev->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,
				 &nets[rnet->mport->id].peers, node) {
		if (nets[rnet->mport->id].active[peer->rdev->destid]) {
			rio_send_doorbell(peer->rdev, RIONET_DOORBELL_LEAVE);
			nets[rnet->mport->id].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_dev(struct device *dev, struct subsys_interface *sif)
{
	struct rio_dev *rdev = to_rio_dev(dev);
	unsigned char netid = rdev->net->hport->id;
	struct rionet_peer *peer, *tmp;

	if (dev_rionet_capable(rdev)) {
		list_for_each_entry_safe(peer, tmp, &nets[netid].peers, node) {
			if (peer->rdev == rdev) {
				if (nets[netid].active[rdev->destid]) {
					nets[netid].active[rdev->destid] = NULL;
					nets[netid].nact--;
				}

				list_del(&peer->node);
				kfree(peer);
				break;
			}
		}
	}
}

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

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

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 int rionet_change_mtu(struct net_device *ndev, int new_mtu)
{
	if ((new_mtu < 68) || (new_mtu > RIONET_MAX_MTU)) {
		printk(KERN_ERR "%s: Invalid MTU size %d\n",
		       ndev->name, new_mtu);
		return -EINVAL;
	}
	ndev->mtu = new_mtu;
	return 0;
}

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		= rionet_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);

	nets[mport->id].active = (struct rio_dev **)__get_free_pages(GFP_KERNEL,
						get_order(rionet_active_bytes));
	if (!nets[mport->id].active) {
		rc = -ENOMEM;
		goto out;
	}
	memset((void *)nets[mport->id].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 = RIONET_MAX_MTU;
	ndev->features = NETIF_F_LLTX;
	SET_NETDEV_DEV(ndev, &mport->dev);
	ndev->ethtool_ops = &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(KERN_INFO "%s: %s %s Version %s, MAC %pM, %s\n",
	       ndev->name,
	       DRV_NAME,
	       DRV_DESC,
	       DRV_VERSION,
	       ndev->dev_addr,
	       mport->name);

      out:
	return rc;
}

static unsigned long net_table[RIONET_MAX_NETS/sizeof(unsigned long) + 1];

static int rionet_add_dev(struct device *dev, struct subsys_interface *sif)
{
	int rc = -ENODEV;
	u32 lsrc_ops, ldst_ops;
	struct rionet_peer *peer;
	struct net_device *ndev = NULL;
	struct rio_dev *rdev = to_rio_dev(dev);
	unsigned char netid = rdev->net->hport->id;
	int oldnet;

	if (netid >= RIONET_MAX_NETS)
		return rc;

	oldnet = test_and_set_bit(netid, net_table);

	/*
	 * If first time through this net, make sure local device is rionet
	 * capable and setup netdev (this step will be skipped in later probes
	 * on the same net).
	 */
	if (!oldnet) {
		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 %s is not network capable\n",
			       DRV_NAME, rdev->net->hport->name);
			goto out;
		}

		/* Allocate our net_device structure */
		ndev = alloc_etherdev(sizeof(struct rionet_private));
		if (ndev == NULL) {
			rc = -ENOMEM;
			goto out;
		}
		nets[netid].ndev = ndev;
		rc = rionet_setup_netdev(rdev->net->hport, ndev);
		if (rc) {
			printk(KERN_ERR "%s: failed to setup netdev (rc=%d)\n",
			       DRV_NAME, rc);
			goto out;
		}

		INIT_LIST_HEAD(&nets[netid].peers);
		nets[netid].nact = 0;
	} else if (nets[netid].ndev == NULL)
		goto out;

	/*
	 * 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, &nets[netid].peers);
	}

	return 0;
out:
	return rc;
}

#ifdef MODULE
static struct rio_device_id rionet_id_table[] = {
	{RIO_DEVICE(RIO_ANY_ID, RIO_ANY_ID)},
	{ 0, }	/* terminate list */
};

MODULE_DEVICE_TABLE(rapidio, rionet_id_table);
#endif

static struct subsys_interface rionet_interface = {
	.name		= "rionet",
	.subsys		= &rio_bus_type,
	.add_dev	= rionet_add_dev,
	.remove_dev	= rionet_remove_dev,
};

static int __init rionet_init(void)
{
	return subsys_interface_register(&rionet_interface);
}

static void __exit rionet_exit(void)
{
	struct rionet_private *rnet;
	struct net_device *ndev;
	struct rionet_peer *peer, *tmp;
	int i;

	for (i = 0; i < RIONET_MAX_NETS; i++) {
		if (nets[i].ndev != NULL) {
			ndev = nets[i].ndev;
			rnet = netdev_priv(ndev);
			unregister_netdev(ndev);

			list_for_each_entry_safe(peer,
						 tmp, &nets[i].peers, node) {
				list_del(&peer->node);
				kfree(peer);
			}

			free_pages((unsigned long)nets[i].active,
				 get_order(sizeof(void *) *
				 RIO_MAX_ROUTE_ENTRIES(rnet->mport->sys_size)));
			nets[i].active = NULL;

			free_netdev(ndev);
		}
	}

	subsys_interface_unregister(&rionet_interface);
}

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"
2fb717ec	29	#define DRV_VERSION "0.3"
f89efd52 MP	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
2fb717ec	50	#define RIONET_MAX_NETS 8
92444bb3 AJ	51	#define RIONET_MSG_SIZE RIO_MAX_MSG_SIZE
92444bb3 AJ	52	#define RIONET_MAX_MTU (RIONET_MSG_SIZE - ETH_HLEN)
f89efd52 MP	53
	54	struct rionet_private {
	55	struct rio_mport *mport;
	56	struct sk_buff *rx_skb[RIONET_RX_RING_SIZE];
	57	struct sk_buff *tx_skb[RIONET_TX_RING_SIZE];
f89efd52 MP	58	int rx_slot;
	59	int tx_slot;
	60	int tx_cnt;
	61	int ack_slot;
	62	spinlock_t lock;
	63	spinlock_t tx_lock;
	64	u32 msg_enable;
	65	};
	66
	67	struct rionet_peer {
	68	struct list_head node;
	69	struct rio_dev *rdev;
	70	struct resource *res;
	71	};
	72
2fb717ec AB	73	struct rionet_net {
	74	struct net_device *ndev;
	75	struct list_head peers;
	76	struct rio_dev **active;
	77	int nact; /* number of active peers */
	78	};
f89efd52	79
2fb717ec	80	static struct rionet_net nets[RIONET_MAX_NETS];
f89efd52	81
284fb68d AB	82	#define is_rionet_capable(src_ops, dst_ops) \
	83	((src_ops & RIO_SRC_OPS_DATA_MSG) && \
	84	(dst_ops & RIO_DST_OPS_DATA_MSG) && \
f89efd52 MP	85	(src_ops & RIO_SRC_OPS_DOORBELL) && \
	86	(dst_ops & RIO_DST_OPS_DOORBELL))
	87	#define dev_rionet_capable(dev) \
284fb68d	88	is_rionet_capable(dev->src_ops, dev->dst_ops)
f89efd52	89
e0c87bd9 AB	90	#define RIONET_MAC_MATCH(x) (!memcmp((x), "\00\01\00\01", 4))
e0c87bd9 AB	91	#define RIONET_GET_DESTID(x) ((((u8 )x + 4) << 8) \| ((u8 )x + 5))
f89efd52	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))
8df8a475 DM	164	printk(KERN_INFO "%s: queued skb len %8.8x\n", DRV_NAME,
8df8a475 DM	165	skb->len);
f89efd52 MP	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;
7c4a6106	177	int add_num = 1;
f89efd52 MP	178
	179	local_irq_save(flags);
	180	if (!spin_trylock(&rnet->tx_lock)) {
	181	local_irq_restore(flags);
	182	return NETDEV_TX_LOCKED;
	183	}
	184
7c4a6106	185	if (is_multicast_ether_addr(eth->h_dest))
2fb717ec	186	add_num = nets[rnet->mport->id].nact;
7c4a6106 AB	187
7c4a6106 AB	188	if ((rnet->tx_cnt + add_num) > RIONET_TX_RING_SIZE) {
f89efd52 MP	189	netif_stop_queue(ndev);
	190	spin_unlock_irqrestore(&rnet->tx_lock, flags);
	191	printk(KERN_ERR "%s: BUG! Tx Ring full when queue awake!\n",
	192	ndev->name);
	193	return NETDEV_TX_BUSY;
	194	}
	195
abfc89c7	196	if (is_multicast_ether_addr(eth->h_dest)) {
7c4a6106	197	int count = 0;
2fb717ec	198
e0423236 ZW	199	for (i = 0; i < RIO_MAX_ROUTE_ENTRIES(rnet->mport->sys_size);
e0423236 ZW	200	i++)
2fb717ec	201	if (nets[rnet->mport->id].active[i]) {
f89efd52	202	rionet_queue_tx_msg(skb, ndev,
2fb717ec	203	nets[rnet->mport->id].active[i]);
7c4a6106 AB	204	if (count)
	205	atomic_inc(&skb->users);
	206	count++;
	207	}
f89efd52 MP	208	} else if (RIONET_MAC_MATCH(eth->h_dest)) {
f89efd52 MP	209	destid = RIONET_GET_DESTID(eth->h_dest);
2fb717ec AB	210	if (nets[rnet->mport->id].active[destid])
	211	rionet_queue_tx_msg(skb, ndev,
	212	nets[rnet->mport->id].active[destid]);
e6161d64 AB	213	else {
	214	/*
	215	* If the target device was removed from the list of
	216	* active peers but we still have TX packets targeting
	217	* it just report sending a packet to the target
	218	* (without actual packet transfer).
	219	*/
	220	dev_kfree_skb_any(skb);
	221	ndev->stats.tx_packets++;
	222	ndev->stats.tx_bytes += skb->len;
	223	}
f89efd52 MP	224	}
	225
	226	spin_unlock_irqrestore(&rnet->tx_lock, flags);
	227
6ed10654	228	return NETDEV_TX_OK;
f89efd52 MP	229	}
	230
	231	static void rionet_dbell_event(struct rio_mport mport, void dev_id, u16 sid, u16 tid,
	232	u16 info)
	233	{
	234	struct net_device *ndev = dev_id;
4cf1653a	235	struct rionet_private *rnet = netdev_priv(ndev);
f89efd52 MP	236	struct rionet_peer *peer;
	237
	238	if (netif_msg_intr(rnet))
	239	printk(KERN_INFO "%s: doorbell sid %4.4x tid %4.4x info %4.4x",
	240	DRV_NAME, sid, tid, info);
	241	if (info == RIONET_DOORBELL_JOIN) {
2fb717ec AB	242	if (!nets[rnet->mport->id].active[sid]) {
	243	list_for_each_entry(peer,
	244	&nets[rnet->mport->id].peers, node) {
7c4a6106	245	if (peer->rdev->destid == sid) {
2fb717ec AB	246	nets[rnet->mport->id].active[sid] =
	247	peer->rdev;
	248	nets[rnet->mport->id].nact++;
7c4a6106	249	}
f89efd52 MP	250	}
	251	rio_mport_send_doorbell(mport, sid,
	252	RIONET_DOORBELL_JOIN);
	253	}
	254	} else if (info == RIONET_DOORBELL_LEAVE) {
2fb717ec AB	255	nets[rnet->mport->id].active[sid] = NULL;
2fb717ec AB	256	nets[rnet->mport->id].nact--;
f89efd52 MP	257	} else {
	258	if (netif_msg_intr(rnet))
	259	printk(KERN_WARNING "%s: unhandled doorbell\n",
	260	DRV_NAME);
	261	}
	262	}
	263
	264	static void rionet_inb_msg_event(struct rio_mport mport, void dev_id, int mbox, int slot)
	265	{
	266	int n;
	267	struct net_device *ndev = dev_id;
4cf1653a	268	struct rionet_private *rnet = netdev_priv(ndev);
f89efd52 MP	269
	270	if (netif_msg_intr(rnet))
	271	printk(KERN_INFO "%s: inbound message event, mbox %d slot %d\n",
	272	DRV_NAME, mbox, slot);
	273
	274	spin_lock(&rnet->lock);
	275	if ((n = rionet_rx_clean(ndev)) != rnet->rx_slot)
	276	rionet_rx_fill(ndev, n);
	277	spin_unlock(&rnet->lock);
	278	}
	279
	280	static void rionet_outb_msg_event(struct rio_mport mport, void dev_id, int mbox, int slot)
	281	{
	282	struct net_device *ndev = dev_id;
4cf1653a	283	struct rionet_private *rnet = netdev_priv(ndev);
f89efd52	284
36915976	285	spin_lock(&rnet->tx_lock);
f89efd52 MP	286
	287	if (netif_msg_intr(rnet))
	288	printk(KERN_INFO
	289	"%s: outbound message event, mbox %d slot %d\n",
	290	DRV_NAME, mbox, slot);
	291
	292	while (rnet->tx_cnt && (rnet->ack_slot != slot)) {
	293	/* dma unmap single */
	294	dev_kfree_skb_irq(rnet->tx_skb[rnet->ack_slot]);
	295	rnet->tx_skb[rnet->ack_slot] = NULL;
	296	++rnet->ack_slot;
	297	rnet->ack_slot &= (RIONET_TX_RING_SIZE - 1);
	298	rnet->tx_cnt--;
	299	}
	300
	301	if (rnet->tx_cnt < RIONET_TX_RING_SIZE)
	302	netif_wake_queue(ndev);
	303
36915976	304	spin_unlock(&rnet->tx_lock);
f89efd52 MP	305	}
	306
	307	static int rionet_open(struct net_device *ndev)
	308	{
	309	int i, rc = 0;
	310	struct rionet_peer peer, tmp;
4cf1653a	311	struct rionet_private *rnet = netdev_priv(ndev);
f89efd52 MP	312
	313	if (netif_msg_ifup(rnet))
	314	printk(KERN_INFO "%s: open\n", DRV_NAME);
	315
	316	if ((rc = rio_request_inb_dbell(rnet->mport,
	317	(void *)ndev,
	318	RIONET_DOORBELL_JOIN,
	319	RIONET_DOORBELL_LEAVE,
	320	rionet_dbell_event)) < 0)
	321	goto out;
	322
	323	if ((rc = rio_request_inb_mbox(rnet->mport,
	324	(void *)ndev,
	325	RIONET_MAILBOX,
	326	RIONET_RX_RING_SIZE,
	327	rionet_inb_msg_event)) < 0)
	328	goto out;
	329
	330	if ((rc = rio_request_outb_mbox(rnet->mport,
	331	(void *)ndev,
	332	RIONET_MAILBOX,
	333	RIONET_TX_RING_SIZE,
	334	rionet_outb_msg_event)) < 0)
	335	goto out;
	336
	337	/* Initialize inbound message ring */
	338	for (i = 0; i < RIONET_RX_RING_SIZE; i++)
	339	rnet->rx_skb[i] = NULL;
	340	rnet->rx_slot = 0;
	341	rionet_rx_fill(ndev, 0);
	342
	343	rnet->tx_slot = 0;
	344	rnet->tx_cnt = 0;
	345	rnet->ack_slot = 0;
	346
	347	netif_carrier_on(ndev);
	348	netif_start_queue(ndev);
	349
2fb717ec AB	350	list_for_each_entry_safe(peer, tmp,
2fb717ec AB	351	&nets[rnet->mport->id].peers, node) {
f89efd52 MP	352	if (!(peer->res = rio_request_outb_dbell(peer->rdev,
	353	RIONET_DOORBELL_JOIN,
	354	RIONET_DOORBELL_LEAVE)))
	355	{
	356	printk(KERN_ERR "%s: error requesting doorbells\n",
	357	DRV_NAME);
	358	continue;
	359	}
	360
284fb68d AB	361	/* Send a join message */
284fb68d AB	362	rio_send_doorbell(peer->rdev, RIONET_DOORBELL_JOIN);
f89efd52 MP	363	}
	364
	365	out:
	366	return rc;
	367	}
	368
	369	static int rionet_close(struct net_device *ndev)
	370	{
4cf1653a	371	struct rionet_private *rnet = netdev_priv(ndev);
f89efd52 MP	372	struct rionet_peer peer, tmp;
	373	int i;
	374
	375	if (netif_msg_ifup(rnet))
2fb717ec	376	printk(KERN_INFO "%s: close %s\n", DRV_NAME, ndev->name);
f89efd52 MP	377
	378	netif_stop_queue(ndev);
	379	netif_carrier_off(ndev);
	380
	381	for (i = 0; i < RIONET_RX_RING_SIZE; i++)
aaff1e19	382	kfree_skb(rnet->rx_skb[i]);
f89efd52	383
2fb717ec AB	384	list_for_each_entry_safe(peer, tmp,
	385	&nets[rnet->mport->id].peers, node) {
	386	if (nets[rnet->mport->id].active[peer->rdev->destid]) {
f89efd52	387	rio_send_doorbell(peer->rdev, RIONET_DOORBELL_LEAVE);
2fb717ec	388	nets[rnet->mport->id].active[peer->rdev->destid] = NULL;
f89efd52 MP	389	}
	390	rio_release_outb_dbell(peer->rdev, peer->res);
	391	}
	392
	393	rio_release_inb_dbell(rnet->mport, RIONET_DOORBELL_JOIN,
	394	RIONET_DOORBELL_LEAVE);
	395	rio_release_inb_mbox(rnet->mport, RIONET_MAILBOX);
	396	rio_release_outb_mbox(rnet->mport, RIONET_MAILBOX);
	397
	398	return 0;
	399	}
	400
71db87ba	401	static void rionet_remove_dev(struct device dev, struct subsys_interface sif)
f89efd52	402	{
e6161d64	403	struct rio_dev *rdev = to_rio_dev(dev);
2fb717ec	404	unsigned char netid = rdev->net->hport->id;
f89efd52 MP	405	struct rionet_peer peer, tmp;
f89efd52 MP	406
e6161d64 AB	407	if (dev_rionet_capable(rdev)) {
	408	list_for_each_entry_safe(peer, tmp, &nets[netid].peers, node) {
	409	if (peer->rdev == rdev) {
	410	if (nets[netid].active[rdev->destid]) {
	411	nets[netid].active[rdev->destid] = NULL;
	412	nets[netid].nact--;
	413	}
2fb717ec	414
e6161d64 AB	415	list_del(&peer->node);
	416	kfree(peer);
	417	break;
	418	}
	419	}
f89efd52 MP	420	}
	421	}
	422
	423	static void rionet_get_drvinfo(struct net_device *ndev,
	424	struct ethtool_drvinfo *info)
	425	{
4cf1653a	426	struct rionet_private *rnet = netdev_priv(ndev);
f89efd52	427
7826d43f JP	428	strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
	429	strlcpy(info->version, DRV_VERSION, sizeof(info->version));
	430	strlcpy(info->fw_version, "n/a", sizeof(info->fw_version));
	431	strlcpy(info->bus_info, rnet->mport->name, sizeof(info->bus_info));
f89efd52 MP	432	}
	433
	434	static u32 rionet_get_msglevel(struct net_device *ndev)
	435	{
4cf1653a	436	struct rionet_private *rnet = netdev_priv(ndev);
f89efd52 MP	437
	438	return rnet->msg_enable;
	439	}
	440
	441	static void rionet_set_msglevel(struct net_device *ndev, u32 value)
	442	{
4cf1653a	443	struct rionet_private *rnet = netdev_priv(ndev);
f89efd52 MP	444
	445	rnet->msg_enable = value;
	446	}
	447
92444bb3 AJ	448	static int rionet_change_mtu(struct net_device *ndev, int new_mtu)
	449	{
	450	if ((new_mtu < 68) \|\| (new_mtu > RIONET_MAX_MTU)) {
	451	printk(KERN_ERR "%s: Invalid MTU size %d\n",
	452	ndev->name, new_mtu);
	453	return -EINVAL;
	454	}
	455	ndev->mtu = new_mtu;
	456	return 0;
	457	}
	458
7282d491	459	static const struct ethtool_ops rionet_ethtool_ops = {
f89efd52 MP	460	.get_drvinfo = rionet_get_drvinfo,
	461	.get_msglevel = rionet_get_msglevel,
	462	.set_msglevel = rionet_set_msglevel,
	463	.get_link = ethtool_op_get_link,
	464	};
	465
a33a2bb3 AB	466	static const struct net_device_ops rionet_netdev_ops = {
	467	.ndo_open = rionet_open,
	468	.ndo_stop = rionet_close,
	469	.ndo_start_xmit = rionet_start_xmit,
92444bb3	470	.ndo_change_mtu = rionet_change_mtu,
a33a2bb3 AB	471	.ndo_validate_addr = eth_validate_addr,
	472	.ndo_set_mac_address = eth_mac_addr,
	473	};
	474
55caa924	475	static int rionet_setup_netdev(struct rio_mport mport, struct net_device ndev)
f89efd52 MP	476	{
f89efd52 MP	477	int rc = 0;
f89efd52 MP	478	struct rionet_private *rnet;
f89efd52 MP	479	u16 device_id;
acc65632 AM	480	const size_t rionet_active_bytes = sizeof(void )
acc65632 AM	481	RIO_MAX_ROUTE_ENTRIES(mport->sys_size);
f89efd52	482
2fb717ec AB	483	nets[mport->id].active = (struct rio_dev **)__get_free_pages(GFP_KERNEL,
	484	get_order(rionet_active_bytes));
	485	if (!nets[mport->id].active) {
e0423236 ZW	486	rc = -ENOMEM;
	487	goto out;
	488	}
2fb717ec	489	memset((void *)nets[mport->id].active, 0, rionet_active_bytes);
e0423236	490
f89efd52	491	/* Set up private area */
4cf1653a	492	rnet = netdev_priv(ndev);
f89efd52 MP	493	rnet->mport = mport;
	494
	495	/* Set the default MAC address */
	496	device_id = rio_local_get_device_id(mport);
	497	ndev->dev_addr[0] = 0x00;
	498	ndev->dev_addr[1] = 0x01;
	499	ndev->dev_addr[2] = 0x00;
	500	ndev->dev_addr[3] = 0x01;
	501	ndev->dev_addr[4] = device_id >> 8;
	502	ndev->dev_addr[5] = device_id & 0xff;
	503
a33a2bb3	504	ndev->netdev_ops = &rionet_netdev_ops;
92444bb3	505	ndev->mtu = RIONET_MAX_MTU;
f89efd52	506	ndev->features = NETIF_F_LLTX;
2aaf308b	507	SET_NETDEV_DEV(ndev, &mport->dev);
7ad24ea4	508	ndev->ethtool_ops = &rionet_ethtool_ops;
f89efd52	509
f89efd52 MP	510	spin_lock_init(&rnet->lock);
	511	spin_lock_init(&rnet->tx_lock);
	512
	513	rnet->msg_enable = RIONET_DEFAULT_MSGLEVEL;
	514
	515	rc = register_netdev(ndev);
	516	if (rc != 0)
	517	goto out;
	518
2fb717ec	519	printk(KERN_INFO "%s: %s %s Version %s, MAC %pM, %s\n",
f89efd52 MP	520	ndev->name,
	521	DRV_NAME,
	522	DRV_DESC,
	523	DRV_VERSION,
2fb717ec AB	524	ndev->dev_addr,
2fb717ec AB	525	mport->name);
f89efd52 MP	526
	527	out:
	528	return rc;
	529	}
	530
2fb717ec AB	531	static unsigned long net_table[RIONET_MAX_NETS/sizeof(unsigned long) + 1];
2fb717ec AB	532
e6161d64	533	static int rionet_add_dev(struct device dev, struct subsys_interface sif)
f89efd52 MP	534	{
f89efd52 MP	535	int rc = -ENODEV;
284fb68d	536	u32 lsrc_ops, ldst_ops;
f89efd52	537	struct rionet_peer *peer;
55caa924	538	struct net_device *ndev = NULL;
e6161d64	539	struct rio_dev *rdev = to_rio_dev(dev);
2fb717ec AB	540	unsigned char netid = rdev->net->hport->id;
2fb717ec AB	541	int oldnet;
f89efd52	542
2fb717ec AB	543	if (netid >= RIONET_MAX_NETS)
2fb717ec AB	544	return rc;
f89efd52	545
2fb717ec	546	oldnet = test_and_set_bit(netid, net_table);
55caa924	547
f89efd52	548	/*
e6161d64 AB	549	* If first time through this net, make sure local device is rionet
	550	* capable and setup netdev (this step will be skipped in later probes
	551	* on the same net).
f89efd52	552	*/
2fb717ec	553	if (!oldnet) {
f89efd52 MP	554	rio_local_read_config_32(rdev->net->hport, RIO_SRC_OPS_CAR,
	555	&lsrc_ops);
	556	rio_local_read_config_32(rdev->net->hport, RIO_DST_OPS_CAR,
	557	&ldst_ops);
284fb68d	558	if (!is_rionet_capable(lsrc_ops, ldst_ops)) {
f89efd52	559	printk(KERN_ERR
2fb717ec AB	560	"%s: local device %s is not network capable\n",
2fb717ec AB	561	DRV_NAME, rdev->net->hport->name);
f89efd52 MP	562	goto out;
	563	}
	564
2fb717ec AB	565	/* Allocate our net_device structure */
	566	ndev = alloc_etherdev(sizeof(struct rionet_private));
	567	if (ndev == NULL) {
	568	rc = -ENOMEM;
	569	goto out;
	570	}
	571	nets[netid].ndev = ndev;
55caa924	572	rc = rionet_setup_netdev(rdev->net->hport, ndev);
e6161d64 AB	573	if (rc) {
	574	printk(KERN_ERR "%s: failed to setup netdev (rc=%d)\n",
	575	DRV_NAME, rc);
	576	goto out;
	577	}
	578
2fb717ec AB	579	INIT_LIST_HEAD(&nets[netid].peers);
	580	nets[netid].nact = 0;
	581	} else if (nets[netid].ndev == NULL)
	582	goto out;
f89efd52 MP	583
	584	/*
	585	* If the remote device has mailbox/doorbell capabilities,
	586	* add it to the peer list.
	587	*/
	588	if (dev_rionet_capable(rdev)) {
	589	if (!(peer = kmalloc(sizeof(struct rionet_peer), GFP_KERNEL))) {
	590	rc = -ENOMEM;
	591	goto out;
	592	}
	593	peer->rdev = rdev;
2fb717ec	594	list_add_tail(&peer->node, &nets[netid].peers);
f89efd52 MP	595	}
f89efd52 MP	596
e6161d64 AB	597	return 0;
e6161d64 AB	598	out:
f89efd52 MP	599	return rc;
	600	}
	601
e6161d64	602	#ifdef MODULE
f89efd52	603	static struct rio_device_id rionet_id_table[] = {
e6161d64 AB	604	{RIO_DEVICE(RIO_ANY_ID, RIO_ANY_ID)},
e6161d64 AB	605	{ 0, } /* terminate list */
f89efd52 MP	606	};
f89efd52 MP	607
e6161d64 AB	608	MODULE_DEVICE_TABLE(rapidio, rionet_id_table);
	609	#endif
	610
	611	static struct subsys_interface rionet_interface = {
	612	.name = "rionet",
	613	.subsys = &rio_bus_type,
	614	.add_dev = rionet_add_dev,
	615	.remove_dev = rionet_remove_dev,
f89efd52 MP	616	};
	617
	618	static int __init rionet_init(void)
	619	{
e6161d64	620	return subsys_interface_register(&rionet_interface);
f89efd52 MP	621	}
	622
	623	static void __exit rionet_exit(void)
	624	{
e6161d64 AB	625	struct rionet_private *rnet;
	626	struct net_device *ndev;
	627	struct rionet_peer peer, tmp;
	628	int i;
	629
	630	for (i = 0; i < RIONET_MAX_NETS; i++) {
	631	if (nets[i].ndev != NULL) {
	632	ndev = nets[i].ndev;
	633	rnet = netdev_priv(ndev);
	634	unregister_netdev(ndev);
	635
	636	list_for_each_entry_safe(peer,
	637	tmp, &nets[i].peers, node) {
	638	list_del(&peer->node);
	639	kfree(peer);
	640	}
	641
	642	free_pages((unsigned long)nets[i].active,
	643	get_order(sizeof(void )
	644	RIO_MAX_ROUTE_ENTRIES(rnet->mport->sys_size)));
	645	nets[i].active = NULL;
	646
	647	free_netdev(ndev);
	648	}
	649	}
	650
	651	subsys_interface_unregister(&rionet_interface);
f89efd52 MP	652	}
f89efd52 MP	653
2f809985	654	late_initcall(rionet_init);
f89efd52	655	module_exit(rionet_exit);