1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * rionet - Ethernet driver over RapidIO messaging services
4 *
5 * Copyright 2005 MontaVista Software, Inc.
6 * Matt Porter <mporter@kernel.crashing.org>
7 */
8
9 #include <linux/module.h>
10 #include <linux/kernel.h>
11 #include <linux/dma-mapping.h>
12 #include <linux/delay.h>
13 #include <linux/rio.h>
14 #include <linux/rio_drv.h>
15 #include <linux/slab.h>
16 #include <linux/rio_ids.h>
17
18 #include <linux/netdevice.h>
19 #include <linux/etherdevice.h>
20 #include <linux/skbuff.h>
21 #include <linux/crc32.h>
22 #include <linux/ethtool.h>
23 #include <linux/reboot.h>
24
25 #define DRV_NAME "rionet"
26 #define DRV_VERSION "0.3"
27 #define DRV_AUTHOR "Matt Porter <mporter@kernel.crashing.org>"
28 #define DRV_DESC "Ethernet over RapidIO"
29
30 MODULE_AUTHOR(DRV_AUTHOR);
31 MODULE_DESCRIPTION(DRV_DESC);
32 MODULE_LICENSE("GPL");
33
34 #define RIONET_DEFAULT_MSGLEVEL \
35 (NETIF_MSG_DRV | \
36 NETIF_MSG_LINK | \
37 NETIF_MSG_RX_ERR | \
38 NETIF_MSG_TX_ERR)
39
40 #define RIONET_DOORBELL_JOIN 0x1000
41 #define RIONET_DOORBELL_LEAVE 0x1001
42
43 #define RIONET_MAILBOX 0
44
45 #define RIONET_TX_RING_SIZE CONFIG_RIONET_TX_SIZE
46 #define RIONET_RX_RING_SIZE CONFIG_RIONET_RX_SIZE
47 #define RIONET_MAX_NETS 8
48 #define RIONET_MSG_SIZE RIO_MAX_MSG_SIZE
49 #define RIONET_MAX_MTU (RIONET_MSG_SIZE - ETH_HLEN)
50
51 struct rionet_private {
52 struct rio_mport *mport;
53 struct sk_buff *rx_skb[RIONET_RX_RING_SIZE];
54 struct sk_buff *tx_skb[RIONET_TX_RING_SIZE];
55 int rx_slot;
56 int tx_slot;
57 int tx_cnt;
58 int ack_slot;
59 spinlock_t lock;
60 spinlock_t tx_lock;
61 u32 msg_enable;
62 bool open;
63 };
64
65 struct rionet_peer {
66 struct list_head node;
67 struct rio_dev *rdev;
68 struct resource *res;
69 };
70
71 struct rionet_net {
72 struct net_device *ndev;
73 struct list_head peers;
74 spinlock_t lock; /* net info access lock */
75 struct rio_dev **active;
76 int nact; /* number of active peers */
77 };
78
79 static struct rionet_net nets[RIONET_MAX_NETS];
80
81 #define is_rionet_capable(src_ops, dst_ops) \
82 ((src_ops & RIO_SRC_OPS_DATA_MSG) && \
83 (dst_ops & RIO_DST_OPS_DATA_MSG) && \
84 (src_ops & RIO_SRC_OPS_DOORBELL) && \
85 (dst_ops & RIO_DST_OPS_DOORBELL))
86 #define dev_rionet_capable(dev) \
87 is_rionet_capable(dev->src_ops, dev->dst_ops)
88
89 #define RIONET_MAC_MATCH(x) (!memcmp((x), "\00\01\00\01", 4))
90 #define RIONET_GET_DESTID(x) ((*((u8 *)x + 4) << 8) | *((u8 *)x + 5))
91
rionet_rx_clean(struct net_device * ndev)92 static int rionet_rx_clean(struct net_device *ndev)
93 {
94 int i;
95 int error = 0;
96 struct rionet_private *rnet = netdev_priv(ndev);
97 void *data;
98
99 i = rnet->rx_slot;
100
101 do {
102 if (!rnet->rx_skb[i])
103 continue;
104
105 if (!(data = rio_get_inb_message(rnet->mport, RIONET_MAILBOX)))
106 break;
107
108 rnet->rx_skb[i]->data = data;
109 skb_put(rnet->rx_skb[i], RIO_MAX_MSG_SIZE);
110 rnet->rx_skb[i]->protocol =
111 eth_type_trans(rnet->rx_skb[i], ndev);
112 error = netif_rx(rnet->rx_skb[i]);
113
114 if (error == NET_RX_DROP) {
115 ndev->stats.rx_dropped++;
116 } else {
117 ndev->stats.rx_packets++;
118 ndev->stats.rx_bytes += RIO_MAX_MSG_SIZE;
119 }
120
121 } while ((i = (i + 1) % RIONET_RX_RING_SIZE) != rnet->rx_slot);
122
123 return i;
124 }
125
rionet_rx_fill(struct net_device * ndev,int end)126 static void rionet_rx_fill(struct net_device *ndev, int end)
127 {
128 int i;
129 struct rionet_private *rnet = netdev_priv(ndev);
130
131 i = rnet->rx_slot;
132 do {
133 rnet->rx_skb[i] = dev_alloc_skb(RIO_MAX_MSG_SIZE);
134
135 if (!rnet->rx_skb[i])
136 break;
137
138 rio_add_inb_buffer(rnet->mport, RIONET_MAILBOX,
139 rnet->rx_skb[i]->data);
140 } while ((i = (i + 1) % RIONET_RX_RING_SIZE) != end);
141
142 rnet->rx_slot = i;
143 }
144
rionet_queue_tx_msg(struct sk_buff * skb,struct net_device * ndev,struct rio_dev * rdev)145 static int rionet_queue_tx_msg(struct sk_buff *skb, struct net_device *ndev,
146 struct rio_dev *rdev)
147 {
148 struct rionet_private *rnet = netdev_priv(ndev);
149
150 rio_add_outb_message(rnet->mport, rdev, 0, skb->data, skb->len);
151 rnet->tx_skb[rnet->tx_slot] = skb;
152
153 ndev->stats.tx_packets++;
154 ndev->stats.tx_bytes += skb->len;
155
156 if (++rnet->tx_cnt == RIONET_TX_RING_SIZE)
157 netif_stop_queue(ndev);
158
159 ++rnet->tx_slot;
160 rnet->tx_slot &= (RIONET_TX_RING_SIZE - 1);
161
162 if (netif_msg_tx_queued(rnet))
163 printk(KERN_INFO "%s: queued skb len %8.8x\n", DRV_NAME,
164 skb->len);
165
166 return 0;
167 }
168
rionet_start_xmit(struct sk_buff * skb,struct net_device * ndev)169 static netdev_tx_t rionet_start_xmit(struct sk_buff *skb,
170 struct net_device *ndev)
171 {
172 int i;
173 struct rionet_private *rnet = netdev_priv(ndev);
174 struct ethhdr *eth = (struct ethhdr *)skb->data;
175 u16 destid;
176 unsigned long flags;
177 int add_num = 1;
178
179 spin_lock_irqsave(&rnet->tx_lock, flags);
180
181 if (is_multicast_ether_addr(eth->h_dest))
182 add_num = nets[rnet->mport->id].nact;
183
184 if ((rnet->tx_cnt + add_num) > RIONET_TX_RING_SIZE) {
185 netif_stop_queue(ndev);
186 spin_unlock_irqrestore(&rnet->tx_lock, flags);
187 printk(KERN_ERR "%s: BUG! Tx Ring full when queue awake!\n",
188 ndev->name);
189 return NETDEV_TX_BUSY;
190 }
191
192 if (is_multicast_ether_addr(eth->h_dest)) {
193 int count = 0;
194
195 for (i = 0; i < RIO_MAX_ROUTE_ENTRIES(rnet->mport->sys_size);
196 i++)
197 if (nets[rnet->mport->id].active[i]) {
198 rionet_queue_tx_msg(skb, ndev,
199 nets[rnet->mport->id].active[i]);
200 if (count)
201 refcount_inc(&skb->users);
202 count++;
203 }
204 } else if (RIONET_MAC_MATCH(eth->h_dest)) {
205 destid = RIONET_GET_DESTID(eth->h_dest);
206 if (nets[rnet->mport->id].active[destid])
207 rionet_queue_tx_msg(skb, ndev,
208 nets[rnet->mport->id].active[destid]);
209 else {
210 /*
211 * If the target device was removed from the list of
212 * active peers but we still have TX packets targeting
213 * it just report sending a packet to the target
214 * (without actual packet transfer).
215 */
216 ndev->stats.tx_packets++;
217 ndev->stats.tx_bytes += skb->len;
218 dev_kfree_skb_any(skb);
219 }
220 }
221
222 spin_unlock_irqrestore(&rnet->tx_lock, flags);
223
224 return NETDEV_TX_OK;
225 }
226
rionet_dbell_event(struct rio_mport * mport,void * dev_id,u16 sid,u16 tid,u16 info)227 static void rionet_dbell_event(struct rio_mport *mport, void *dev_id, u16 sid, u16 tid,
228 u16 info)
229 {
230 struct net_device *ndev = dev_id;
231 struct rionet_private *rnet = netdev_priv(ndev);
232 struct rionet_peer *peer;
233 unsigned char netid = rnet->mport->id;
234
235 if (netif_msg_intr(rnet))
236 printk(KERN_INFO "%s: doorbell sid %4.4x tid %4.4x info %4.4x",
237 DRV_NAME, sid, tid, info);
238 if (info == RIONET_DOORBELL_JOIN) {
239 if (!nets[netid].active[sid]) {
240 spin_lock(&nets[netid].lock);
241 list_for_each_entry(peer, &nets[netid].peers, node) {
242 if (peer->rdev->destid == sid) {
243 nets[netid].active[sid] = peer->rdev;
244 nets[netid].nact++;
245 }
246 }
247 spin_unlock(&nets[netid].lock);
248
249 rio_mport_send_doorbell(mport, sid,
250 RIONET_DOORBELL_JOIN);
251 }
252 } else if (info == RIONET_DOORBELL_LEAVE) {
253 spin_lock(&nets[netid].lock);
254 if (nets[netid].active[sid]) {
255 nets[netid].active[sid] = NULL;
256 nets[netid].nact--;
257 }
258 spin_unlock(&nets[netid].lock);
259 } else {
260 if (netif_msg_intr(rnet))
261 printk(KERN_WARNING "%s: unhandled doorbell\n",
262 DRV_NAME);
263 }
264 }
265
rionet_inb_msg_event(struct rio_mport * mport,void * dev_id,int mbox,int slot)266 static void rionet_inb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot)
267 {
268 int n;
269 struct net_device *ndev = dev_id;
270 struct rionet_private *rnet = netdev_priv(ndev);
271
272 if (netif_msg_intr(rnet))
273 printk(KERN_INFO "%s: inbound message event, mbox %d slot %d\n",
274 DRV_NAME, mbox, slot);
275
276 spin_lock(&rnet->lock);
277 if ((n = rionet_rx_clean(ndev)) != rnet->rx_slot)
278 rionet_rx_fill(ndev, n);
279 spin_unlock(&rnet->lock);
280 }
281
rionet_outb_msg_event(struct rio_mport * mport,void * dev_id,int mbox,int slot)282 static void rionet_outb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot)
283 {
284 struct net_device *ndev = dev_id;
285 struct rionet_private *rnet = netdev_priv(ndev);
286
287 spin_lock(&rnet->tx_lock);
288
289 if (netif_msg_intr(rnet))
290 printk(KERN_INFO
291 "%s: outbound message event, mbox %d slot %d\n",
292 DRV_NAME, mbox, slot);
293
294 while (rnet->tx_cnt && (rnet->ack_slot != slot)) {
295 /* dma unmap single */
296 dev_kfree_skb_irq(rnet->tx_skb[rnet->ack_slot]);
297 rnet->tx_skb[rnet->ack_slot] = NULL;
298 ++rnet->ack_slot;
299 rnet->ack_slot &= (RIONET_TX_RING_SIZE - 1);
300 rnet->tx_cnt--;
301 }
302
303 if (rnet->tx_cnt < RIONET_TX_RING_SIZE)
304 netif_wake_queue(ndev);
305
306 spin_unlock(&rnet->tx_lock);
307 }
308
rionet_open(struct net_device * ndev)309 static int rionet_open(struct net_device *ndev)
310 {
311 int i, rc = 0;
312 struct rionet_peer *peer;
313 struct rionet_private *rnet = netdev_priv(ndev);
314 unsigned char netid = rnet->mport->id;
315 unsigned long flags;
316
317 if (netif_msg_ifup(rnet))
318 printk(KERN_INFO "%s: open\n", DRV_NAME);
319
320 if ((rc = rio_request_inb_dbell(rnet->mport,
321 (void *)ndev,
322 RIONET_DOORBELL_JOIN,
323 RIONET_DOORBELL_LEAVE,
324 rionet_dbell_event)) < 0)
325 goto out;
326
327 if ((rc = rio_request_inb_mbox(rnet->mport,
328 (void *)ndev,
329 RIONET_MAILBOX,
330 RIONET_RX_RING_SIZE,
331 rionet_inb_msg_event)) < 0)
332 goto out;
333
334 if ((rc = rio_request_outb_mbox(rnet->mport,
335 (void *)ndev,
336 RIONET_MAILBOX,
337 RIONET_TX_RING_SIZE,
338 rionet_outb_msg_event)) < 0)
339 goto out;
340
341 /* Initialize inbound message ring */
342 for (i = 0; i < RIONET_RX_RING_SIZE; i++)
343 rnet->rx_skb[i] = NULL;
344 rnet->rx_slot = 0;
345 rionet_rx_fill(ndev, 0);
346
347 rnet->tx_slot = 0;
348 rnet->tx_cnt = 0;
349 rnet->ack_slot = 0;
350
351 netif_carrier_on(ndev);
352 netif_start_queue(ndev);
353
354 spin_lock_irqsave(&nets[netid].lock, flags);
355 list_for_each_entry(peer, &nets[netid].peers, node) {
356 /* Send a join message */
357 rio_send_doorbell(peer->rdev, RIONET_DOORBELL_JOIN);
358 }
359 spin_unlock_irqrestore(&nets[netid].lock, flags);
360 rnet->open = true;
361
362 out:
363 return rc;
364 }
365
rionet_close(struct net_device * ndev)366 static int rionet_close(struct net_device *ndev)
367 {
368 struct rionet_private *rnet = netdev_priv(ndev);
369 struct rionet_peer *peer;
370 unsigned char netid = rnet->mport->id;
371 unsigned long flags;
372 int i;
373
374 if (netif_msg_ifup(rnet))
375 printk(KERN_INFO "%s: close %s\n", DRV_NAME, ndev->name);
376
377 netif_stop_queue(ndev);
378 netif_carrier_off(ndev);
379 rnet->open = false;
380
381 for (i = 0; i < RIONET_RX_RING_SIZE; i++)
382 kfree_skb(rnet->rx_skb[i]);
383
384 spin_lock_irqsave(&nets[netid].lock, flags);
385 list_for_each_entry(peer, &nets[netid].peers, node) {
386 if (nets[netid].active[peer->rdev->destid]) {
387 rio_send_doorbell(peer->rdev, RIONET_DOORBELL_LEAVE);
388 nets[netid].active[peer->rdev->destid] = NULL;
389 }
390 if (peer->res)
391 rio_release_outb_dbell(peer->rdev, peer->res);
392 }
393 spin_unlock_irqrestore(&nets[netid].lock, flags);
394
395 rio_release_inb_dbell(rnet->mport, RIONET_DOORBELL_JOIN,
396 RIONET_DOORBELL_LEAVE);
397 rio_release_inb_mbox(rnet->mport, RIONET_MAILBOX);
398 rio_release_outb_mbox(rnet->mport, RIONET_MAILBOX);
399
400 return 0;
401 }
402
rionet_remove_dev(struct device * dev,struct subsys_interface * sif)403 static void rionet_remove_dev(struct device *dev, struct subsys_interface *sif)
404 {
405 struct rio_dev *rdev = to_rio_dev(dev);
406 unsigned char netid = rdev->net->hport->id;
407 struct rionet_peer *peer;
408 int state, found = 0;
409 unsigned long flags;
410
411 if (!dev_rionet_capable(rdev))
412 return;
413
414 spin_lock_irqsave(&nets[netid].lock, flags);
415 list_for_each_entry(peer, &nets[netid].peers, node) {
416 if (peer->rdev == rdev) {
417 list_del(&peer->node);
418 if (nets[netid].active[rdev->destid]) {
419 state = atomic_read(&rdev->state);
420 if (state != RIO_DEVICE_GONE &&
421 state != RIO_DEVICE_INITIALIZING) {
422 rio_send_doorbell(rdev,
423 RIONET_DOORBELL_LEAVE);
424 }
425 nets[netid].active[rdev->destid] = NULL;
426 nets[netid].nact--;
427 }
428 found = 1;
429 break;
430 }
431 }
432 spin_unlock_irqrestore(&nets[netid].lock, flags);
433
434 if (found) {
435 if (peer->res)
436 rio_release_outb_dbell(rdev, peer->res);
437 kfree(peer);
438 }
439 }
440
rionet_get_drvinfo(struct net_device * ndev,struct ethtool_drvinfo * info)441 static void rionet_get_drvinfo(struct net_device *ndev,
442 struct ethtool_drvinfo *info)
443 {
444 struct rionet_private *rnet = netdev_priv(ndev);
445
446 strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
447 strlcpy(info->version, DRV_VERSION, sizeof(info->version));
448 strlcpy(info->fw_version, "n/a", sizeof(info->fw_version));
449 strlcpy(info->bus_info, rnet->mport->name, sizeof(info->bus_info));
450 }
451
rionet_get_msglevel(struct net_device * ndev)452 static u32 rionet_get_msglevel(struct net_device *ndev)
453 {
454 struct rionet_private *rnet = netdev_priv(ndev);
455
456 return rnet->msg_enable;
457 }
458
rionet_set_msglevel(struct net_device * ndev,u32 value)459 static void rionet_set_msglevel(struct net_device *ndev, u32 value)
460 {
461 struct rionet_private *rnet = netdev_priv(ndev);
462
463 rnet->msg_enable = value;
464 }
465
466 static const struct ethtool_ops rionet_ethtool_ops = {
467 .get_drvinfo = rionet_get_drvinfo,
468 .get_msglevel = rionet_get_msglevel,
469 .set_msglevel = rionet_set_msglevel,
470 .get_link = ethtool_op_get_link,
471 };
472
473 static const struct net_device_ops rionet_netdev_ops = {
474 .ndo_open = rionet_open,
475 .ndo_stop = rionet_close,
476 .ndo_start_xmit = rionet_start_xmit,
477 .ndo_validate_addr = eth_validate_addr,
478 .ndo_set_mac_address = eth_mac_addr,
479 };
480
rionet_setup_netdev(struct rio_mport * mport,struct net_device * ndev)481 static int rionet_setup_netdev(struct rio_mport *mport, struct net_device *ndev)
482 {
483 int rc = 0;
484 struct rionet_private *rnet;
485 u16 device_id;
486 const size_t rionet_active_bytes = sizeof(void *) *
487 RIO_MAX_ROUTE_ENTRIES(mport->sys_size);
488
489 nets[mport->id].active = (struct rio_dev **)__get_free_pages(GFP_KERNEL,
490 get_order(rionet_active_bytes));
491 if (!nets[mport->id].active) {
492 rc = -ENOMEM;
493 goto out;
494 }
495 memset((void *)nets[mport->id].active, 0, rionet_active_bytes);
496
497 /* Set up private area */
498 rnet = netdev_priv(ndev);
499 rnet->mport = mport;
500 rnet->open = false;
501
502 /* Set the default MAC address */
503 device_id = rio_local_get_device_id(mport);
504 ndev->dev_addr[0] = 0x00;
505 ndev->dev_addr[1] = 0x01;
506 ndev->dev_addr[2] = 0x00;
507 ndev->dev_addr[3] = 0x01;
508 ndev->dev_addr[4] = device_id >> 8;
509 ndev->dev_addr[5] = device_id & 0xff;
510
511 ndev->netdev_ops = &rionet_netdev_ops;
512 ndev->mtu = RIONET_MAX_MTU;
513 /* MTU range: 68 - 4082 */
514 ndev->min_mtu = ETH_MIN_MTU;
515 ndev->max_mtu = RIONET_MAX_MTU;
516 ndev->features = NETIF_F_LLTX;
517 SET_NETDEV_DEV(ndev, &mport->dev);
518 ndev->ethtool_ops = &rionet_ethtool_ops;
519
520 spin_lock_init(&rnet->lock);
521 spin_lock_init(&rnet->tx_lock);
522
523 rnet->msg_enable = RIONET_DEFAULT_MSGLEVEL;
524
525 rc = register_netdev(ndev);
526 if (rc != 0) {
527 free_pages((unsigned long)nets[mport->id].active,
528 get_order(rionet_active_bytes));
529 goto out;
530 }
531
532 printk(KERN_INFO "%s: %s %s Version %s, MAC %pM, %s\n",
533 ndev->name,
534 DRV_NAME,
535 DRV_DESC,
536 DRV_VERSION,
537 ndev->dev_addr,
538 mport->name);
539
540 out:
541 return rc;
542 }
543
rionet_add_dev(struct device * dev,struct subsys_interface * sif)544 static int rionet_add_dev(struct device *dev, struct subsys_interface *sif)
545 {
546 int rc = -ENODEV;
547 u32 lsrc_ops, ldst_ops;
548 struct rionet_peer *peer;
549 struct net_device *ndev = NULL;
550 struct rio_dev *rdev = to_rio_dev(dev);
551 unsigned char netid = rdev->net->hport->id;
552
553 if (netid >= RIONET_MAX_NETS)
554 return rc;
555
556 /*
557 * If first time through this net, make sure local device is rionet
558 * capable and setup netdev (this step will be skipped in later probes
559 * on the same net).
560 */
561 if (!nets[netid].ndev) {
562 rio_local_read_config_32(rdev->net->hport, RIO_SRC_OPS_CAR,
563 &lsrc_ops);
564 rio_local_read_config_32(rdev->net->hport, RIO_DST_OPS_CAR,
565 &ldst_ops);
566 if (!is_rionet_capable(lsrc_ops, ldst_ops)) {
567 printk(KERN_ERR
568 "%s: local device %s is not network capable\n",
569 DRV_NAME, rdev->net->hport->name);
570 goto out;
571 }
572
573 /* Allocate our net_device structure */
574 ndev = alloc_etherdev(sizeof(struct rionet_private));
575 if (ndev == NULL) {
576 rc = -ENOMEM;
577 goto out;
578 }
579
580 rc = rionet_setup_netdev(rdev->net->hport, ndev);
581 if (rc) {
582 printk(KERN_ERR "%s: failed to setup netdev (rc=%d)\n",
583 DRV_NAME, rc);
584 free_netdev(ndev);
585 goto out;
586 }
587
588 INIT_LIST_HEAD(&nets[netid].peers);
589 spin_lock_init(&nets[netid].lock);
590 nets[netid].nact = 0;
591 nets[netid].ndev = ndev;
592 }
593
594 /*
595 * If the remote device has mailbox/doorbell capabilities,
596 * add it to the peer list.
597 */
598 if (dev_rionet_capable(rdev)) {
599 struct rionet_private *rnet;
600 unsigned long flags;
601
602 rnet = netdev_priv(nets[netid].ndev);
603
604 peer = kzalloc(sizeof(*peer), GFP_KERNEL);
605 if (!peer) {
606 rc = -ENOMEM;
607 goto out;
608 }
609 peer->rdev = rdev;
610 peer->res = rio_request_outb_dbell(peer->rdev,
611 RIONET_DOORBELL_JOIN,
612 RIONET_DOORBELL_LEAVE);
613 if (!peer->res) {
614 pr_err("%s: error requesting doorbells\n", DRV_NAME);
615 kfree(peer);
616 rc = -ENOMEM;
617 goto out;
618 }
619
620 spin_lock_irqsave(&nets[netid].lock, flags);
621 list_add_tail(&peer->node, &nets[netid].peers);
622 spin_unlock_irqrestore(&nets[netid].lock, flags);
623 pr_debug("%s: %s add peer %s\n",
624 DRV_NAME, __func__, rio_name(rdev));
625
626 /* If netdev is already opened, send join request to new peer */
627 if (rnet->open)
628 rio_send_doorbell(peer->rdev, RIONET_DOORBELL_JOIN);
629 }
630
631 return 0;
632 out:
633 return rc;
634 }
635
rionet_shutdown(struct notifier_block * nb,unsigned long code,void * unused)636 static int rionet_shutdown(struct notifier_block *nb, unsigned long code,
637 void *unused)
638 {
639 struct rionet_peer *peer;
640 unsigned long flags;
641 int i;
642
643 pr_debug("%s: %s\n", DRV_NAME, __func__);
644
645 for (i = 0; i < RIONET_MAX_NETS; i++) {
646 if (!nets[i].ndev)
647 continue;
648
649 spin_lock_irqsave(&nets[i].lock, flags);
650 list_for_each_entry(peer, &nets[i].peers, node) {
651 if (nets[i].active[peer->rdev->destid]) {
652 rio_send_doorbell(peer->rdev,
653 RIONET_DOORBELL_LEAVE);
654 nets[i].active[peer->rdev->destid] = NULL;
655 }
656 }
657 spin_unlock_irqrestore(&nets[i].lock, flags);
658 }
659
660 return NOTIFY_DONE;
661 }
662
rionet_remove_mport(struct device * dev,struct class_interface * class_intf)663 static void rionet_remove_mport(struct device *dev,
664 struct class_interface *class_intf)
665 {
666 struct rio_mport *mport = to_rio_mport(dev);
667 struct net_device *ndev;
668 int id = mport->id;
669
670 pr_debug("%s %s\n", __func__, mport->name);
671
672 WARN(nets[id].nact, "%s called when connected to %d peers\n",
673 __func__, nets[id].nact);
674 WARN(!nets[id].ndev, "%s called for mport without NDEV\n",
675 __func__);
676
677 if (nets[id].ndev) {
678 ndev = nets[id].ndev;
679 netif_stop_queue(ndev);
680 unregister_netdev(ndev);
681
682 free_pages((unsigned long)nets[id].active,
683 get_order(sizeof(void *) *
684 RIO_MAX_ROUTE_ENTRIES(mport->sys_size)));
685 nets[id].active = NULL;
686 free_netdev(ndev);
687 nets[id].ndev = NULL;
688 }
689 }
690
691 #ifdef MODULE
692 static struct rio_device_id rionet_id_table[] = {
693 {RIO_DEVICE(RIO_ANY_ID, RIO_ANY_ID)},
694 { 0, } /* terminate list */
695 };
696
697 MODULE_DEVICE_TABLE(rapidio, rionet_id_table);
698 #endif
699
700 static struct subsys_interface rionet_interface = {
701 .name = "rionet",
702 .subsys = &rio_bus_type,
703 .add_dev = rionet_add_dev,
704 .remove_dev = rionet_remove_dev,
705 };
706
707 static struct notifier_block rionet_notifier = {
708 .notifier_call = rionet_shutdown,
709 };
710
711 /* the rio_mport_interface is used to handle local mport devices */
712 static struct class_interface rio_mport_interface __refdata = {
713 .class = &rio_mport_class,
714 .add_dev = NULL,
715 .remove_dev = rionet_remove_mport,
716 };
717
rionet_init(void)718 static int __init rionet_init(void)
719 {
720 int ret;
721
722 ret = register_reboot_notifier(&rionet_notifier);
723 if (ret) {
724 pr_err("%s: failed to register reboot notifier (err=%d)\n",
725 DRV_NAME, ret);
726 return ret;
727 }
728
729 ret = class_interface_register(&rio_mport_interface);
730 if (ret) {
731 pr_err("%s: class_interface_register error: %d\n",
732 DRV_NAME, ret);
733 return ret;
734 }
735
736 return subsys_interface_register(&rionet_interface);
737 }
738
rionet_exit(void)739 static void __exit rionet_exit(void)
740 {
741 unregister_reboot_notifier(&rionet_notifier);
742 subsys_interface_unregister(&rionet_interface);
743 class_interface_unregister(&rio_mport_interface);
744 }
745
746 late_initcall(rionet_init);
747 module_exit(rionet_exit);
748