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rionet.c (19025B)


      1 /*
      2  * rionet - Ethernet driver over RapidIO messaging services
      3  *
      4  * Copyright 2005 MontaVista Software, Inc.
      5  * Matt Porter <mporter@kernel.crashing.org>
      6  *
      7  * This program is free software; you can redistribute  it and/or modify it
      8  * under  the terms of  the GNU General  Public License as published by the
      9  * Free Software Foundation;  either version 2 of the  License, or (at your
     10  * option) any later version.
     11  */
     12 
     13 #include <linux/module.h>
     14 #include <linux/kernel.h>
     15 #include <linux/dma-mapping.h>
     16 #include <linux/delay.h>
     17 #include <linux/rio.h>
     18 #include <linux/rio_drv.h>
     19 #include <linux/slab.h>
     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 #include <linux/reboot.h>
     28 
     29 #define DRV_NAME        "rionet"
     30 #define DRV_VERSION     "0.3"
     31 #define DRV_AUTHOR      "Matt Porter <mporter@kernel.crashing.org>"
     32 #define DRV_DESC        "Ethernet over RapidIO"
     33 
     34 MODULE_AUTHOR(DRV_AUTHOR);
     35 MODULE_DESCRIPTION(DRV_DESC);
     36 MODULE_LICENSE("GPL");
     37 
     38 #define RIONET_DEFAULT_MSGLEVEL \
     39 			(NETIF_MSG_DRV          | \
     40 			 NETIF_MSG_LINK         | \
     41 			 NETIF_MSG_RX_ERR       | \
     42 			 NETIF_MSG_TX_ERR)
     43 
     44 #define RIONET_DOORBELL_JOIN	0x1000
     45 #define RIONET_DOORBELL_LEAVE	0x1001
     46 
     47 #define RIONET_MAILBOX		0
     48 
     49 #define RIONET_TX_RING_SIZE	CONFIG_RIONET_TX_SIZE
     50 #define RIONET_RX_RING_SIZE	CONFIG_RIONET_RX_SIZE
     51 #define RIONET_MAX_NETS		8
     52 #define RIONET_MSG_SIZE         RIO_MAX_MSG_SIZE
     53 #define RIONET_MAX_MTU          (RIONET_MSG_SIZE - ETH_HLEN)
     54 
     55 struct rionet_private {
     56 	struct rio_mport *mport;
     57 	struct sk_buff *rx_skb[RIONET_RX_RING_SIZE];
     58 	struct sk_buff *tx_skb[RIONET_TX_RING_SIZE];
     59 	int rx_slot;
     60 	int tx_slot;
     61 	int tx_cnt;
     62 	int ack_slot;
     63 	spinlock_t lock;
     64 	spinlock_t tx_lock;
     65 	u32 msg_enable;
     66 	bool open;
     67 };
     68 
     69 struct rionet_peer {
     70 	struct list_head node;
     71 	struct rio_dev *rdev;
     72 	struct resource *res;
     73 };
     74 
     75 struct rionet_net {
     76 	struct net_device *ndev;
     77 	struct list_head peers;
     78 	spinlock_t lock;	/* net info access lock */
     79 	struct rio_dev **active;
     80 	int nact;	/* number of active peers */
     81 };
     82 
     83 static struct rionet_net nets[RIONET_MAX_NETS];
     84 
     85 #define is_rionet_capable(src_ops, dst_ops)			\
     86 			((src_ops & RIO_SRC_OPS_DATA_MSG) &&	\
     87 			 (dst_ops & RIO_DST_OPS_DATA_MSG) &&	\
     88 			 (src_ops & RIO_SRC_OPS_DOORBELL) &&	\
     89 			 (dst_ops & RIO_DST_OPS_DOORBELL))
     90 #define dev_rionet_capable(dev) \
     91 	is_rionet_capable(dev->src_ops, dev->dst_ops)
     92 
     93 #define RIONET_MAC_MATCH(x)	(!memcmp((x), "\00\01\00\01", 4))
     94 #define RIONET_GET_DESTID(x)	((*((u8 *)x + 4) << 8) | *((u8 *)x + 5))
     95 
     96 static int rionet_rx_clean(struct net_device *ndev)
     97 {
     98 	int i;
     99 	int error = 0;
    100 	struct rionet_private *rnet = netdev_priv(ndev);
    101 	void *data;
    102 
    103 	i = rnet->rx_slot;
    104 
    105 	do {
    106 		if (!rnet->rx_skb[i])
    107 			continue;
    108 
    109 		if (!(data = rio_get_inb_message(rnet->mport, RIONET_MAILBOX)))
    110 			break;
    111 
    112 		rnet->rx_skb[i]->data = data;
    113 		skb_put(rnet->rx_skb[i], RIO_MAX_MSG_SIZE);
    114 		rnet->rx_skb[i]->protocol =
    115 		    eth_type_trans(rnet->rx_skb[i], ndev);
    116 		error = netif_rx(rnet->rx_skb[i]);
    117 
    118 		if (error == NET_RX_DROP) {
    119 			ndev->stats.rx_dropped++;
    120 		} else {
    121 			ndev->stats.rx_packets++;
    122 			ndev->stats.rx_bytes += RIO_MAX_MSG_SIZE;
    123 		}
    124 
    125 	} while ((i = (i + 1) % RIONET_RX_RING_SIZE) != rnet->rx_slot);
    126 
    127 	return i;
    128 }
    129 
    130 static void rionet_rx_fill(struct net_device *ndev, int end)
    131 {
    132 	int i;
    133 	struct rionet_private *rnet = netdev_priv(ndev);
    134 
    135 	i = rnet->rx_slot;
    136 	do {
    137 		rnet->rx_skb[i] = dev_alloc_skb(RIO_MAX_MSG_SIZE);
    138 
    139 		if (!rnet->rx_skb[i])
    140 			break;
    141 
    142 		rio_add_inb_buffer(rnet->mport, RIONET_MAILBOX,
    143 				   rnet->rx_skb[i]->data);
    144 	} while ((i = (i + 1) % RIONET_RX_RING_SIZE) != end);
    145 
    146 	rnet->rx_slot = i;
    147 }
    148 
    149 static int rionet_queue_tx_msg(struct sk_buff *skb, struct net_device *ndev,
    150 			       struct rio_dev *rdev)
    151 {
    152 	struct rionet_private *rnet = netdev_priv(ndev);
    153 
    154 	rio_add_outb_message(rnet->mport, rdev, 0, skb->data, skb->len);
    155 	rnet->tx_skb[rnet->tx_slot] = skb;
    156 
    157 	ndev->stats.tx_packets++;
    158 	ndev->stats.tx_bytes += skb->len;
    159 
    160 	if (++rnet->tx_cnt == RIONET_TX_RING_SIZE)
    161 		netif_stop_queue(ndev);
    162 
    163 	++rnet->tx_slot;
    164 	rnet->tx_slot &= (RIONET_TX_RING_SIZE - 1);
    165 
    166 	if (netif_msg_tx_queued(rnet))
    167 		printk(KERN_INFO "%s: queued skb len %8.8x\n", DRV_NAME,
    168 		       skb->len);
    169 
    170 	return 0;
    171 }
    172 
    173 static int rionet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
    174 {
    175 	int i;
    176 	struct rionet_private *rnet = netdev_priv(ndev);
    177 	struct ethhdr *eth = (struct ethhdr *)skb->data;
    178 	u16 destid;
    179 	unsigned long flags;
    180 	int add_num = 1;
    181 
    182 	spin_lock_irqsave(&rnet->tx_lock, flags);
    183 
    184 	if (is_multicast_ether_addr(eth->h_dest))
    185 		add_num = nets[rnet->mport->id].nact;
    186 
    187 	if ((rnet->tx_cnt + add_num) > RIONET_TX_RING_SIZE) {
    188 		netif_stop_queue(ndev);
    189 		spin_unlock_irqrestore(&rnet->tx_lock, flags);
    190 		printk(KERN_ERR "%s: BUG! Tx Ring full when queue awake!\n",
    191 		       ndev->name);
    192 		return NETDEV_TX_BUSY;
    193 	}
    194 
    195 	if (is_multicast_ether_addr(eth->h_dest)) {
    196 		int count = 0;
    197 
    198 		for (i = 0; i < RIO_MAX_ROUTE_ENTRIES(rnet->mport->sys_size);
    199 				i++)
    200 			if (nets[rnet->mport->id].active[i]) {
    201 				rionet_queue_tx_msg(skb, ndev,
    202 					nets[rnet->mport->id].active[i]);
    203 				if (count)
    204 					refcount_inc(&skb->users);
    205 				count++;
    206 			}
    207 	} else if (RIONET_MAC_MATCH(eth->h_dest)) {
    208 		destid = RIONET_GET_DESTID(eth->h_dest);
    209 		if (nets[rnet->mport->id].active[destid])
    210 			rionet_queue_tx_msg(skb, ndev,
    211 					nets[rnet->mport->id].active[destid]);
    212 		else {
    213 			/*
    214 			 * If the target device was removed from the list of
    215 			 * active peers but we still have TX packets targeting
    216 			 * it just report sending a packet to the target
    217 			 * (without actual packet transfer).
    218 			 */
    219 			ndev->stats.tx_packets++;
    220 			ndev->stats.tx_bytes += skb->len;
    221 			dev_kfree_skb_any(skb);
    222 		}
    223 	}
    224 
    225 	spin_unlock_irqrestore(&rnet->tx_lock, flags);
    226 
    227 	return NETDEV_TX_OK;
    228 }
    229 
    230 static void rionet_dbell_event(struct rio_mport *mport, void *dev_id, u16 sid, u16 tid,
    231 			       u16 info)
    232 {
    233 	struct net_device *ndev = dev_id;
    234 	struct rionet_private *rnet = netdev_priv(ndev);
    235 	struct rionet_peer *peer;
    236 	unsigned char netid = rnet->mport->id;
    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) {
    242 		if (!nets[netid].active[sid]) {
    243 			spin_lock(&nets[netid].lock);
    244 			list_for_each_entry(peer, &nets[netid].peers, node) {
    245 				if (peer->rdev->destid == sid) {
    246 					nets[netid].active[sid] = peer->rdev;
    247 					nets[netid].nact++;
    248 				}
    249 			}
    250 			spin_unlock(&nets[netid].lock);
    251 
    252 			rio_mport_send_doorbell(mport, sid,
    253 						RIONET_DOORBELL_JOIN);
    254 		}
    255 	} else if (info == RIONET_DOORBELL_LEAVE) {
    256 		spin_lock(&nets[netid].lock);
    257 		if (nets[netid].active[sid]) {
    258 			nets[netid].active[sid] = NULL;
    259 			nets[netid].nact--;
    260 		}
    261 		spin_unlock(&nets[netid].lock);
    262 	} else {
    263 		if (netif_msg_intr(rnet))
    264 			printk(KERN_WARNING "%s: unhandled doorbell\n",
    265 			       DRV_NAME);
    266 	}
    267 }
    268 
    269 static void rionet_inb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot)
    270 {
    271 	int n;
    272 	struct net_device *ndev = dev_id;
    273 	struct rionet_private *rnet = netdev_priv(ndev);
    274 
    275 	if (netif_msg_intr(rnet))
    276 		printk(KERN_INFO "%s: inbound message event, mbox %d slot %d\n",
    277 		       DRV_NAME, mbox, slot);
    278 
    279 	spin_lock(&rnet->lock);
    280 	if ((n = rionet_rx_clean(ndev)) != rnet->rx_slot)
    281 		rionet_rx_fill(ndev, n);
    282 	spin_unlock(&rnet->lock);
    283 }
    284 
    285 static void rionet_outb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot)
    286 {
    287 	struct net_device *ndev = dev_id;
    288 	struct rionet_private *rnet = netdev_priv(ndev);
    289 
    290 	spin_lock(&rnet->tx_lock);
    291 
    292 	if (netif_msg_intr(rnet))
    293 		printk(KERN_INFO
    294 		       "%s: outbound message event, mbox %d slot %d\n",
    295 		       DRV_NAME, mbox, slot);
    296 
    297 	while (rnet->tx_cnt && (rnet->ack_slot != slot)) {
    298 		/* dma unmap single */
    299 		dev_kfree_skb_irq(rnet->tx_skb[rnet->ack_slot]);
    300 		rnet->tx_skb[rnet->ack_slot] = NULL;
    301 		++rnet->ack_slot;
    302 		rnet->ack_slot &= (RIONET_TX_RING_SIZE - 1);
    303 		rnet->tx_cnt--;
    304 	}
    305 
    306 	if (rnet->tx_cnt < RIONET_TX_RING_SIZE)
    307 		netif_wake_queue(ndev);
    308 
    309 	spin_unlock(&rnet->tx_lock);
    310 }
    311 
    312 static int rionet_open(struct net_device *ndev)
    313 {
    314 	int i, rc = 0;
    315 	struct rionet_peer *peer;
    316 	struct rionet_private *rnet = netdev_priv(ndev);
    317 	unsigned char netid = rnet->mport->id;
    318 	unsigned long flags;
    319 
    320 	if (netif_msg_ifup(rnet))
    321 		printk(KERN_INFO "%s: open\n", DRV_NAME);
    322 
    323 	if ((rc = rio_request_inb_dbell(rnet->mport,
    324 					(void *)ndev,
    325 					RIONET_DOORBELL_JOIN,
    326 					RIONET_DOORBELL_LEAVE,
    327 					rionet_dbell_event)) < 0)
    328 		goto out;
    329 
    330 	if ((rc = rio_request_inb_mbox(rnet->mport,
    331 				       (void *)ndev,
    332 				       RIONET_MAILBOX,
    333 				       RIONET_RX_RING_SIZE,
    334 				       rionet_inb_msg_event)) < 0)
    335 		goto out;
    336 
    337 	if ((rc = rio_request_outb_mbox(rnet->mport,
    338 					(void *)ndev,
    339 					RIONET_MAILBOX,
    340 					RIONET_TX_RING_SIZE,
    341 					rionet_outb_msg_event)) < 0)
    342 		goto out;
    343 
    344 	/* Initialize inbound message ring */
    345 	for (i = 0; i < RIONET_RX_RING_SIZE; i++)
    346 		rnet->rx_skb[i] = NULL;
    347 	rnet->rx_slot = 0;
    348 	rionet_rx_fill(ndev, 0);
    349 
    350 	rnet->tx_slot = 0;
    351 	rnet->tx_cnt = 0;
    352 	rnet->ack_slot = 0;
    353 
    354 	netif_carrier_on(ndev);
    355 	netif_start_queue(ndev);
    356 
    357 	spin_lock_irqsave(&nets[netid].lock, flags);
    358 	list_for_each_entry(peer, &nets[netid].peers, node) {
    359 		/* Send a join message */
    360 		rio_send_doorbell(peer->rdev, RIONET_DOORBELL_JOIN);
    361 	}
    362 	spin_unlock_irqrestore(&nets[netid].lock, flags);
    363 	rnet->open = true;
    364 
    365       out:
    366 	return rc;
    367 }
    368 
    369 static int rionet_close(struct net_device *ndev)
    370 {
    371 	struct rionet_private *rnet = netdev_priv(ndev);
    372 	struct rionet_peer *peer;
    373 	unsigned char netid = rnet->mport->id;
    374 	unsigned long flags;
    375 	int i;
    376 
    377 	if (netif_msg_ifup(rnet))
    378 		printk(KERN_INFO "%s: close %s\n", DRV_NAME, ndev->name);
    379 
    380 	netif_stop_queue(ndev);
    381 	netif_carrier_off(ndev);
    382 	rnet->open = false;
    383 
    384 	for (i = 0; i < RIONET_RX_RING_SIZE; i++)
    385 		kfree_skb(rnet->rx_skb[i]);
    386 
    387 	spin_lock_irqsave(&nets[netid].lock, flags);
    388 	list_for_each_entry(peer, &nets[netid].peers, node) {
    389 		if (nets[netid].active[peer->rdev->destid]) {
    390 			rio_send_doorbell(peer->rdev, RIONET_DOORBELL_LEAVE);
    391 			nets[netid].active[peer->rdev->destid] = NULL;
    392 		}
    393 		if (peer->res)
    394 			rio_release_outb_dbell(peer->rdev, peer->res);
    395 	}
    396 	spin_unlock_irqrestore(&nets[netid].lock, flags);
    397 
    398 	rio_release_inb_dbell(rnet->mport, RIONET_DOORBELL_JOIN,
    399 			      RIONET_DOORBELL_LEAVE);
    400 	rio_release_inb_mbox(rnet->mport, RIONET_MAILBOX);
    401 	rio_release_outb_mbox(rnet->mport, RIONET_MAILBOX);
    402 
    403 	return 0;
    404 }
    405 
    406 static void rionet_remove_dev(struct device *dev, struct subsys_interface *sif)
    407 {
    408 	struct rio_dev *rdev = to_rio_dev(dev);
    409 	unsigned char netid = rdev->net->hport->id;
    410 	struct rionet_peer *peer;
    411 	int state, found = 0;
    412 	unsigned long flags;
    413 
    414 	if (!dev_rionet_capable(rdev))
    415 		return;
    416 
    417 	spin_lock_irqsave(&nets[netid].lock, flags);
    418 	list_for_each_entry(peer, &nets[netid].peers, node) {
    419 		if (peer->rdev == rdev) {
    420 			list_del(&peer->node);
    421 			if (nets[netid].active[rdev->destid]) {
    422 				state = atomic_read(&rdev->state);
    423 				if (state != RIO_DEVICE_GONE &&
    424 				    state != RIO_DEVICE_INITIALIZING) {
    425 					rio_send_doorbell(rdev,
    426 							RIONET_DOORBELL_LEAVE);
    427 				}
    428 				nets[netid].active[rdev->destid] = NULL;
    429 				nets[netid].nact--;
    430 			}
    431 			found = 1;
    432 			break;
    433 		}
    434 	}
    435 	spin_unlock_irqrestore(&nets[netid].lock, flags);
    436 
    437 	if (found) {
    438 		if (peer->res)
    439 			rio_release_outb_dbell(rdev, peer->res);
    440 		kfree(peer);
    441 	}
    442 }
    443 
    444 static void rionet_get_drvinfo(struct net_device *ndev,
    445 			       struct ethtool_drvinfo *info)
    446 {
    447 	struct rionet_private *rnet = netdev_priv(ndev);
    448 
    449 	strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
    450 	strlcpy(info->version, DRV_VERSION, sizeof(info->version));
    451 	strlcpy(info->fw_version, "n/a", sizeof(info->fw_version));
    452 	strlcpy(info->bus_info, rnet->mport->name, sizeof(info->bus_info));
    453 }
    454 
    455 static u32 rionet_get_msglevel(struct net_device *ndev)
    456 {
    457 	struct rionet_private *rnet = netdev_priv(ndev);
    458 
    459 	return rnet->msg_enable;
    460 }
    461 
    462 static void rionet_set_msglevel(struct net_device *ndev, u32 value)
    463 {
    464 	struct rionet_private *rnet = netdev_priv(ndev);
    465 
    466 	rnet->msg_enable = value;
    467 }
    468 
    469 static const struct ethtool_ops rionet_ethtool_ops = {
    470 	.get_drvinfo = rionet_get_drvinfo,
    471 	.get_msglevel = rionet_get_msglevel,
    472 	.set_msglevel = rionet_set_msglevel,
    473 	.get_link = ethtool_op_get_link,
    474 };
    475 
    476 static const struct net_device_ops rionet_netdev_ops = {
    477 	.ndo_open		= rionet_open,
    478 	.ndo_stop		= rionet_close,
    479 	.ndo_start_xmit		= rionet_start_xmit,
    480 	.ndo_validate_addr	= eth_validate_addr,
    481 	.ndo_set_mac_address	= eth_mac_addr,
    482 };
    483 
    484 static int rionet_setup_netdev(struct rio_mport *mport, struct net_device *ndev)
    485 {
    486 	int rc = 0;
    487 	struct rionet_private *rnet;
    488 	u16 device_id;
    489 	const size_t rionet_active_bytes = sizeof(void *) *
    490 				RIO_MAX_ROUTE_ENTRIES(mport->sys_size);
    491 
    492 	nets[mport->id].active = (struct rio_dev **)__get_free_pages(GFP_KERNEL,
    493 						get_order(rionet_active_bytes));
    494 	if (!nets[mport->id].active) {
    495 		rc = -ENOMEM;
    496 		goto out;
    497 	}
    498 	memset((void *)nets[mport->id].active, 0, rionet_active_bytes);
    499 
    500 	/* Set up private area */
    501 	rnet = netdev_priv(ndev);
    502 	rnet->mport = mport;
    503 	rnet->open = false;
    504 
    505 	/* Set the default MAC address */
    506 	device_id = rio_local_get_device_id(mport);
    507 	ndev->dev_addr[0] = 0x00;
    508 	ndev->dev_addr[1] = 0x01;
    509 	ndev->dev_addr[2] = 0x00;
    510 	ndev->dev_addr[3] = 0x01;
    511 	ndev->dev_addr[4] = device_id >> 8;
    512 	ndev->dev_addr[5] = device_id & 0xff;
    513 
    514 	ndev->netdev_ops = &rionet_netdev_ops;
    515 	ndev->mtu = RIONET_MAX_MTU;
    516 	/* MTU range: 68 - 4082 */
    517 	ndev->min_mtu = ETH_MIN_MTU;
    518 	ndev->max_mtu = RIONET_MAX_MTU;
    519 	ndev->features = NETIF_F_LLTX;
    520 	SET_NETDEV_DEV(ndev, &mport->dev);
    521 	ndev->ethtool_ops = &rionet_ethtool_ops;
    522 
    523 	spin_lock_init(&rnet->lock);
    524 	spin_lock_init(&rnet->tx_lock);
    525 
    526 	rnet->msg_enable = RIONET_DEFAULT_MSGLEVEL;
    527 
    528 	rc = register_netdev(ndev);
    529 	if (rc != 0) {
    530 		free_pages((unsigned long)nets[mport->id].active,
    531 			   get_order(rionet_active_bytes));
    532 		goto out;
    533 	}
    534 
    535 	printk(KERN_INFO "%s: %s %s Version %s, MAC %pM, %s\n",
    536 	       ndev->name,
    537 	       DRV_NAME,
    538 	       DRV_DESC,
    539 	       DRV_VERSION,
    540 	       ndev->dev_addr,
    541 	       mport->name);
    542 
    543       out:
    544 	return rc;
    545 }
    546 
    547 static int rionet_add_dev(struct device *dev, struct subsys_interface *sif)
    548 {
    549 	int rc = -ENODEV;
    550 	u32 lsrc_ops, ldst_ops;
    551 	struct rionet_peer *peer;
    552 	struct net_device *ndev = NULL;
    553 	struct rio_dev *rdev = to_rio_dev(dev);
    554 	unsigned char netid = rdev->net->hport->id;
    555 
    556 	if (netid >= RIONET_MAX_NETS)
    557 		return rc;
    558 
    559 	/*
    560 	 * If first time through this net, make sure local device is rionet
    561 	 * capable and setup netdev (this step will be skipped in later probes
    562 	 * on the same net).
    563 	 */
    564 	if (!nets[netid].ndev) {
    565 		rio_local_read_config_32(rdev->net->hport, RIO_SRC_OPS_CAR,
    566 					 &lsrc_ops);
    567 		rio_local_read_config_32(rdev->net->hport, RIO_DST_OPS_CAR,
    568 					 &ldst_ops);
    569 		if (!is_rionet_capable(lsrc_ops, ldst_ops)) {
    570 			printk(KERN_ERR
    571 			       "%s: local device %s is not network capable\n",
    572 			       DRV_NAME, rdev->net->hport->name);
    573 			goto out;
    574 		}
    575 
    576 		/* Allocate our net_device structure */
    577 		ndev = alloc_etherdev(sizeof(struct rionet_private));
    578 		if (ndev == NULL) {
    579 			rc = -ENOMEM;
    580 			goto out;
    581 		}
    582 
    583 		rc = rionet_setup_netdev(rdev->net->hport, ndev);
    584 		if (rc) {
    585 			printk(KERN_ERR "%s: failed to setup netdev (rc=%d)\n",
    586 			       DRV_NAME, rc);
    587 			free_netdev(ndev);
    588 			goto out;
    589 		}
    590 
    591 		INIT_LIST_HEAD(&nets[netid].peers);
    592 		spin_lock_init(&nets[netid].lock);
    593 		nets[netid].nact = 0;
    594 		nets[netid].ndev = ndev;
    595 	}
    596 
    597 	/*
    598 	 * If the remote device has mailbox/doorbell capabilities,
    599 	 * add it to the peer list.
    600 	 */
    601 	if (dev_rionet_capable(rdev)) {
    602 		struct rionet_private *rnet;
    603 		unsigned long flags;
    604 
    605 		rnet = netdev_priv(nets[netid].ndev);
    606 
    607 		peer = kzalloc(sizeof(*peer), GFP_KERNEL);
    608 		if (!peer) {
    609 			rc = -ENOMEM;
    610 			goto out;
    611 		}
    612 		peer->rdev = rdev;
    613 		peer->res = rio_request_outb_dbell(peer->rdev,
    614 						RIONET_DOORBELL_JOIN,
    615 						RIONET_DOORBELL_LEAVE);
    616 		if (!peer->res) {
    617 			pr_err("%s: error requesting doorbells\n", DRV_NAME);
    618 			kfree(peer);
    619 			rc = -ENOMEM;
    620 			goto out;
    621 		}
    622 
    623 		spin_lock_irqsave(&nets[netid].lock, flags);
    624 		list_add_tail(&peer->node, &nets[netid].peers);
    625 		spin_unlock_irqrestore(&nets[netid].lock, flags);
    626 		pr_debug("%s: %s add peer %s\n",
    627 			 DRV_NAME, __func__, rio_name(rdev));
    628 
    629 		/* If netdev is already opened, send join request to new peer */
    630 		if (rnet->open)
    631 			rio_send_doorbell(peer->rdev, RIONET_DOORBELL_JOIN);
    632 	}
    633 
    634 	return 0;
    635 out:
    636 	return rc;
    637 }
    638 
    639 static int rionet_shutdown(struct notifier_block *nb, unsigned long code,
    640 			   void *unused)
    641 {
    642 	struct rionet_peer *peer;
    643 	unsigned long flags;
    644 	int i;
    645 
    646 	pr_debug("%s: %s\n", DRV_NAME, __func__);
    647 
    648 	for (i = 0; i < RIONET_MAX_NETS; i++) {
    649 		if (!nets[i].ndev)
    650 			continue;
    651 
    652 		spin_lock_irqsave(&nets[i].lock, flags);
    653 		list_for_each_entry(peer, &nets[i].peers, node) {
    654 			if (nets[i].active[peer->rdev->destid]) {
    655 				rio_send_doorbell(peer->rdev,
    656 						  RIONET_DOORBELL_LEAVE);
    657 				nets[i].active[peer->rdev->destid] = NULL;
    658 			}
    659 		}
    660 		spin_unlock_irqrestore(&nets[i].lock, flags);
    661 	}
    662 
    663 	return NOTIFY_DONE;
    664 }
    665 
    666 static void rionet_remove_mport(struct device *dev,
    667 				struct class_interface *class_intf)
    668 {
    669 	struct rio_mport *mport = to_rio_mport(dev);
    670 	struct net_device *ndev;
    671 	int id = mport->id;
    672 
    673 	pr_debug("%s %s\n", __func__, mport->name);
    674 
    675 	WARN(nets[id].nact, "%s called when connected to %d peers\n",
    676 	     __func__, nets[id].nact);
    677 	WARN(!nets[id].ndev, "%s called for mport without NDEV\n",
    678 	     __func__);
    679 
    680 	if (nets[id].ndev) {
    681 		ndev = nets[id].ndev;
    682 		netif_stop_queue(ndev);
    683 		unregister_netdev(ndev);
    684 
    685 		free_pages((unsigned long)nets[id].active,
    686 			   get_order(sizeof(void *) *
    687 			   RIO_MAX_ROUTE_ENTRIES(mport->sys_size)));
    688 		nets[id].active = NULL;
    689 		free_netdev(ndev);
    690 		nets[id].ndev = NULL;
    691 	}
    692 }
    693 
    694 #ifdef MODULE
    695 static struct rio_device_id rionet_id_table[] = {
    696 	{RIO_DEVICE(RIO_ANY_ID, RIO_ANY_ID)},
    697 	{ 0, }	/* terminate list */
    698 };
    699 
    700 MODULE_DEVICE_TABLE(rapidio, rionet_id_table);
    701 #endif
    702 
    703 static struct subsys_interface rionet_interface = {
    704 	.name		= "rionet",
    705 	.subsys		= &rio_bus_type,
    706 	.add_dev	= rionet_add_dev,
    707 	.remove_dev	= rionet_remove_dev,
    708 };
    709 
    710 static struct notifier_block rionet_notifier = {
    711 	.notifier_call = rionet_shutdown,
    712 };
    713 
    714 /* the rio_mport_interface is used to handle local mport devices */
    715 static struct class_interface rio_mport_interface __refdata = {
    716 	.class = &rio_mport_class,
    717 	.add_dev = NULL,
    718 	.remove_dev = rionet_remove_mport,
    719 };
    720 
    721 static int __init rionet_init(void)
    722 {
    723 	int ret;
    724 
    725 	ret = register_reboot_notifier(&rionet_notifier);
    726 	if (ret) {
    727 		pr_err("%s: failed to register reboot notifier (err=%d)\n",
    728 		       DRV_NAME, ret);
    729 		return ret;
    730 	}
    731 
    732 	ret = class_interface_register(&rio_mport_interface);
    733 	if (ret) {
    734 		pr_err("%s: class_interface_register error: %d\n",
    735 		       DRV_NAME, ret);
    736 		return ret;
    737 	}
    738 
    739 	return subsys_interface_register(&rionet_interface);
    740 }
    741 
    742 static void __exit rionet_exit(void)
    743 {
    744 	unregister_reboot_notifier(&rionet_notifier);
    745 	subsys_interface_unregister(&rionet_interface);
    746 	class_interface_unregister(&rio_mport_interface);
    747 }
    748 
    749 late_initcall(rionet_init);
    750 module_exit(rionet_exit);