xref: /openbmc/linux/drivers/net/rionet.c (revision 95db3b25)
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 					atomic_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 			dev_kfree_skb_any(skb);
220 			ndev->stats.tx_packets++;
221 			ndev->stats.tx_bytes += skb->len;
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 int rionet_change_mtu(struct net_device *ndev, int new_mtu)
470 {
471 	if ((new_mtu < 68) || (new_mtu > RIONET_MAX_MTU)) {
472 		printk(KERN_ERR "%s: Invalid MTU size %d\n",
473 		       ndev->name, new_mtu);
474 		return -EINVAL;
475 	}
476 	ndev->mtu = new_mtu;
477 	return 0;
478 }
479 
480 static const struct ethtool_ops rionet_ethtool_ops = {
481 	.get_drvinfo = rionet_get_drvinfo,
482 	.get_msglevel = rionet_get_msglevel,
483 	.set_msglevel = rionet_set_msglevel,
484 	.get_link = ethtool_op_get_link,
485 };
486 
487 static const struct net_device_ops rionet_netdev_ops = {
488 	.ndo_open		= rionet_open,
489 	.ndo_stop		= rionet_close,
490 	.ndo_start_xmit		= rionet_start_xmit,
491 	.ndo_change_mtu		= rionet_change_mtu,
492 	.ndo_validate_addr	= eth_validate_addr,
493 	.ndo_set_mac_address	= eth_mac_addr,
494 };
495 
496 static int rionet_setup_netdev(struct rio_mport *mport, struct net_device *ndev)
497 {
498 	int rc = 0;
499 	struct rionet_private *rnet;
500 	u16 device_id;
501 	const size_t rionet_active_bytes = sizeof(void *) *
502 				RIO_MAX_ROUTE_ENTRIES(mport->sys_size);
503 
504 	nets[mport->id].active = (struct rio_dev **)__get_free_pages(GFP_KERNEL,
505 						get_order(rionet_active_bytes));
506 	if (!nets[mport->id].active) {
507 		rc = -ENOMEM;
508 		goto out;
509 	}
510 	memset((void *)nets[mport->id].active, 0, rionet_active_bytes);
511 
512 	/* Set up private area */
513 	rnet = netdev_priv(ndev);
514 	rnet->mport = mport;
515 	rnet->open = false;
516 
517 	/* Set the default MAC address */
518 	device_id = rio_local_get_device_id(mport);
519 	ndev->dev_addr[0] = 0x00;
520 	ndev->dev_addr[1] = 0x01;
521 	ndev->dev_addr[2] = 0x00;
522 	ndev->dev_addr[3] = 0x01;
523 	ndev->dev_addr[4] = device_id >> 8;
524 	ndev->dev_addr[5] = device_id & 0xff;
525 
526 	ndev->netdev_ops = &rionet_netdev_ops;
527 	ndev->mtu = RIONET_MAX_MTU;
528 	ndev->features = NETIF_F_LLTX;
529 	SET_NETDEV_DEV(ndev, &mport->dev);
530 	ndev->ethtool_ops = &rionet_ethtool_ops;
531 
532 	spin_lock_init(&rnet->lock);
533 	spin_lock_init(&rnet->tx_lock);
534 
535 	rnet->msg_enable = RIONET_DEFAULT_MSGLEVEL;
536 
537 	rc = register_netdev(ndev);
538 	if (rc != 0) {
539 		free_pages((unsigned long)nets[mport->id].active,
540 			   get_order(rionet_active_bytes));
541 		goto out;
542 	}
543 
544 	printk(KERN_INFO "%s: %s %s Version %s, MAC %pM, %s\n",
545 	       ndev->name,
546 	       DRV_NAME,
547 	       DRV_DESC,
548 	       DRV_VERSION,
549 	       ndev->dev_addr,
550 	       mport->name);
551 
552       out:
553 	return rc;
554 }
555 
556 static int rionet_add_dev(struct device *dev, struct subsys_interface *sif)
557 {
558 	int rc = -ENODEV;
559 	u32 lsrc_ops, ldst_ops;
560 	struct rionet_peer *peer;
561 	struct net_device *ndev = NULL;
562 	struct rio_dev *rdev = to_rio_dev(dev);
563 	unsigned char netid = rdev->net->hport->id;
564 
565 	if (netid >= RIONET_MAX_NETS)
566 		return rc;
567 
568 	/*
569 	 * If first time through this net, make sure local device is rionet
570 	 * capable and setup netdev (this step will be skipped in later probes
571 	 * on the same net).
572 	 */
573 	if (!nets[netid].ndev) {
574 		rio_local_read_config_32(rdev->net->hport, RIO_SRC_OPS_CAR,
575 					 &lsrc_ops);
576 		rio_local_read_config_32(rdev->net->hport, RIO_DST_OPS_CAR,
577 					 &ldst_ops);
578 		if (!is_rionet_capable(lsrc_ops, ldst_ops)) {
579 			printk(KERN_ERR
580 			       "%s: local device %s is not network capable\n",
581 			       DRV_NAME, rdev->net->hport->name);
582 			goto out;
583 		}
584 
585 		/* Allocate our net_device structure */
586 		ndev = alloc_etherdev(sizeof(struct rionet_private));
587 		if (ndev == NULL) {
588 			rc = -ENOMEM;
589 			goto out;
590 		}
591 
592 		rc = rionet_setup_netdev(rdev->net->hport, ndev);
593 		if (rc) {
594 			printk(KERN_ERR "%s: failed to setup netdev (rc=%d)\n",
595 			       DRV_NAME, rc);
596 			free_netdev(ndev);
597 			goto out;
598 		}
599 
600 		INIT_LIST_HEAD(&nets[netid].peers);
601 		spin_lock_init(&nets[netid].lock);
602 		nets[netid].nact = 0;
603 		nets[netid].ndev = ndev;
604 	}
605 
606 	/*
607 	 * If the remote device has mailbox/doorbell capabilities,
608 	 * add it to the peer list.
609 	 */
610 	if (dev_rionet_capable(rdev)) {
611 		struct rionet_private *rnet;
612 		unsigned long flags;
613 
614 		rnet = netdev_priv(nets[netid].ndev);
615 
616 		peer = kzalloc(sizeof(*peer), GFP_KERNEL);
617 		if (!peer) {
618 			rc = -ENOMEM;
619 			goto out;
620 		}
621 		peer->rdev = rdev;
622 		peer->res = rio_request_outb_dbell(peer->rdev,
623 						RIONET_DOORBELL_JOIN,
624 						RIONET_DOORBELL_LEAVE);
625 		if (!peer->res) {
626 			pr_err("%s: error requesting doorbells\n", DRV_NAME);
627 			kfree(peer);
628 			rc = -ENOMEM;
629 			goto out;
630 		}
631 
632 		spin_lock_irqsave(&nets[netid].lock, flags);
633 		list_add_tail(&peer->node, &nets[netid].peers);
634 		spin_unlock_irqrestore(&nets[netid].lock, flags);
635 		pr_debug("%s: %s add peer %s\n",
636 			 DRV_NAME, __func__, rio_name(rdev));
637 
638 		/* If netdev is already opened, send join request to new peer */
639 		if (rnet->open)
640 			rio_send_doorbell(peer->rdev, RIONET_DOORBELL_JOIN);
641 	}
642 
643 	return 0;
644 out:
645 	return rc;
646 }
647 
648 static int rionet_shutdown(struct notifier_block *nb, unsigned long code,
649 			   void *unused)
650 {
651 	struct rionet_peer *peer;
652 	unsigned long flags;
653 	int i;
654 
655 	pr_debug("%s: %s\n", DRV_NAME, __func__);
656 
657 	for (i = 0; i < RIONET_MAX_NETS; i++) {
658 		if (!nets[i].ndev)
659 			continue;
660 
661 		spin_lock_irqsave(&nets[i].lock, flags);
662 		list_for_each_entry(peer, &nets[i].peers, node) {
663 			if (nets[i].active[peer->rdev->destid]) {
664 				rio_send_doorbell(peer->rdev,
665 						  RIONET_DOORBELL_LEAVE);
666 				nets[i].active[peer->rdev->destid] = NULL;
667 			}
668 		}
669 		spin_unlock_irqrestore(&nets[i].lock, flags);
670 	}
671 
672 	return NOTIFY_DONE;
673 }
674 
675 static void rionet_remove_mport(struct device *dev,
676 				struct class_interface *class_intf)
677 {
678 	struct rio_mport *mport = to_rio_mport(dev);
679 	struct net_device *ndev;
680 	int id = mport->id;
681 
682 	pr_debug("%s %s\n", __func__, mport->name);
683 
684 	WARN(nets[id].nact, "%s called when connected to %d peers\n",
685 	     __func__, nets[id].nact);
686 	WARN(!nets[id].ndev, "%s called for mport without NDEV\n",
687 	     __func__);
688 
689 	if (nets[id].ndev) {
690 		ndev = nets[id].ndev;
691 		netif_stop_queue(ndev);
692 		unregister_netdev(ndev);
693 
694 		free_pages((unsigned long)nets[id].active,
695 			   get_order(sizeof(void *) *
696 			   RIO_MAX_ROUTE_ENTRIES(mport->sys_size)));
697 		nets[id].active = NULL;
698 		free_netdev(ndev);
699 		nets[id].ndev = NULL;
700 	}
701 }
702 
703 #ifdef MODULE
704 static struct rio_device_id rionet_id_table[] = {
705 	{RIO_DEVICE(RIO_ANY_ID, RIO_ANY_ID)},
706 	{ 0, }	/* terminate list */
707 };
708 
709 MODULE_DEVICE_TABLE(rapidio, rionet_id_table);
710 #endif
711 
712 static struct subsys_interface rionet_interface = {
713 	.name		= "rionet",
714 	.subsys		= &rio_bus_type,
715 	.add_dev	= rionet_add_dev,
716 	.remove_dev	= rionet_remove_dev,
717 };
718 
719 static struct notifier_block rionet_notifier = {
720 	.notifier_call = rionet_shutdown,
721 };
722 
723 /* the rio_mport_interface is used to handle local mport devices */
724 static struct class_interface rio_mport_interface __refdata = {
725 	.class = &rio_mport_class,
726 	.add_dev = NULL,
727 	.remove_dev = rionet_remove_mport,
728 };
729 
730 static int __init rionet_init(void)
731 {
732 	int ret;
733 
734 	ret = register_reboot_notifier(&rionet_notifier);
735 	if (ret) {
736 		pr_err("%s: failed to register reboot notifier (err=%d)\n",
737 		       DRV_NAME, ret);
738 		return ret;
739 	}
740 
741 	ret = class_interface_register(&rio_mport_interface);
742 	if (ret) {
743 		pr_err("%s: class_interface_register error: %d\n",
744 		       DRV_NAME, ret);
745 		return ret;
746 	}
747 
748 	return subsys_interface_register(&rionet_interface);
749 }
750 
751 static void __exit rionet_exit(void)
752 {
753 	unregister_reboot_notifier(&rionet_notifier);
754 	subsys_interface_unregister(&rionet_interface);
755 	class_interface_unregister(&rio_mport_interface);
756 }
757 
758 late_initcall(rionet_init);
759 module_exit(rionet_exit);
760