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IB/srp: Fix memory leak on reconnect
[linux-block.git] / drivers / infiniband / ulp / ipoib / ipoib_main.c
CommitLineData
1da177e4
LT		 1/*
2 * Copyright (c) 2004 Topspin Communications. All rights reserved.
2a1d9b7f
RD		 3 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
4 * Copyright (c) 2004 Voltaire, Inc. All rights reserved.
1da177e4
LT		 5 *
6 * This software is available to you under a choice of one of two
7 * licenses. You may choose to be licensed under the terms of the GNU
8 * General Public License (GPL) Version 2, available from the file
9 * COPYING in the main directory of this source tree, or the
10 * OpenIB.org BSD license below:
11 *
12 * Redistribution and use in source and binary forms, with or
13 * without modification, are permitted provided that the following
14 * conditions are met:
15 *
16 * - Redistributions of source code must retain the above
17 * copyright notice, this list of conditions and the following
18 * disclaimer.
19 *
20 * - Redistributions in binary form must reproduce the above
21 * copyright notice, this list of conditions and the following
22 * disclaimer in the documentation and/or other materials
23 * provided with the distribution.
24 *
25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
26 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
32 * SOFTWARE.
33 *
34 * $Id: ipoib_main.c 1377 2004-12-23 19:57:12Z roland $
35 */
36
37#include "ipoib.h"
38
1da177e4
LT		 39#include <linux/module.h>
40
41#include <linux/init.h>
42#include <linux/slab.h>
0f485251 43#include <linux/kernel.h>
1da177e4
LT		 44
45#include <linux/if_arp.h> /* For ARPHRD_xxx */
46
47#include <linux/ip.h>
48#include <linux/in.h>
49
14c85021
ACM		 50#include <net/dst.h>
51
073ae841
MT		 52#define IPOIB_QPN(ha) (be32_to_cpup((__be32 *) ha) & 0xffffff)
53
1da177e4
LT		 54MODULE_AUTHOR("Roland Dreier");
55MODULE_DESCRIPTION("IP-over-InfiniBand net driver");
56MODULE_LICENSE("Dual BSD/GPL");
57
0f485251
SM		 58int ipoib_sendq_size __read_mostly = IPOIB_TX_RING_SIZE;
59int ipoib_recvq_size __read_mostly = IPOIB_RX_RING_SIZE;
60
61module_param_named(send_queue_size, ipoib_sendq_size, int, 0444);
62MODULE_PARM_DESC(send_queue_size, "Number of descriptors in send queue");
63module_param_named(recv_queue_size, ipoib_recvq_size, int, 0444);
64MODULE_PARM_DESC(recv_queue_size, "Number of descriptors in receive queue");
65
1da177e4
LT		 66#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
67int ipoib_debug_level;
68
69module_param_named(debug_level, ipoib_debug_level, int, 0644);
70MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0");
71#endif
72
1732b0ef
RD		 73struct ipoib_path_iter {
74 struct net_device *dev;
75 struct ipoib_path path;
76};
77
1da177e4
LT		 78static const u8 ipv4_bcast_addr[] = {
79 0x00, 0xff, 0xff, 0xff,
80 0xff, 0x12, 0x40, 0x1b, 0x00, 0x00, 0x00, 0x00,
81 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff
82};
83
84struct workqueue_struct *ipoib_workqueue;
85
c1a0b23b
MT		 86struct ib_sa_client ipoib_sa_client;
87
1da177e4
LT		 88static void ipoib_add_one(struct ib_device *device);
89static void ipoib_remove_one(struct ib_device *device);
90
91static struct ib_client ipoib_client = {
92 .name = "ipoib",
93 .add = ipoib_add_one,
94 .remove = ipoib_remove_one
95};
96
97int ipoib_open(struct net_device *dev)
98{
99 struct ipoib_dev_priv *priv = netdev_priv(dev);
100
101 ipoib_dbg(priv, "bringing up interface\n");
102
103 set_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
104
105 if (ipoib_pkey_dev_delay_open(dev))
106 return 0;
107
108 if (ipoib_ib_dev_open(dev))
109 return -EINVAL;
110
267ee88e
RD		 111 if (ipoib_ib_dev_up(dev)) {
112 ipoib_ib_dev_stop(dev);
1da177e4 113 return -EINVAL;
267ee88e 114 }
1da177e4
LT		 115
116 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
117 struct ipoib_dev_priv *cpriv;
118
119 /* Bring up any child interfaces too */
95ed644f 120 mutex_lock(&priv->vlan_mutex);
1da177e4
LT		 121 list_for_each_entry(cpriv, &priv->child_intfs, list) {
122 int flags;
123
124 flags = cpriv->dev->flags;
125 if (flags & IFF_UP)
126 continue;
127
128 dev_change_flags(cpriv->dev, flags | IFF_UP);
129 }
95ed644f 130 mutex_unlock(&priv->vlan_mutex);
1da177e4
LT		 131 }
132
133 netif_start_queue(dev);
134
135 return 0;
136}
137
138static int ipoib_stop(struct net_device *dev)
139{
140 struct ipoib_dev_priv *priv = netdev_priv(dev);
141
142 ipoib_dbg(priv, "stopping interface\n");
143
144 clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
145
146 netif_stop_queue(dev);
147
0b3ea082
JM		 148 /*
149 * Now flush workqueue to make sure a scheduled task doesn't
150 * bring our internal state back up.
151 */
152 flush_workqueue(ipoib_workqueue);
153
154 ipoib_ib_dev_down(dev, 1);
1da177e4
LT		 155 ipoib_ib_dev_stop(dev);
156
157 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
158 struct ipoib_dev_priv *cpriv;
159
160 /* Bring down any child interfaces too */
95ed644f 161 mutex_lock(&priv->vlan_mutex);
1da177e4
LT		 162 list_for_each_entry(cpriv, &priv->child_intfs, list) {
163 int flags;
164
165 flags = cpriv->dev->flags;
166 if (!(flags & IFF_UP))
167 continue;
168
169 dev_change_flags(cpriv->dev, flags & ~IFF_UP);
170 }
95ed644f 171 mutex_unlock(&priv->vlan_mutex);
1da177e4
LT		 172 }
173
174 return 0;
175}
176
177static int ipoib_change_mtu(struct net_device *dev, int new_mtu)
178{
179 struct ipoib_dev_priv *priv = netdev_priv(dev);
180
181 if (new_mtu > IPOIB_PACKET_SIZE - IPOIB_ENCAP_LEN)
182 return -EINVAL;
183
184 priv->admin_mtu = new_mtu;
185
186 dev->mtu = min(priv->mcast_mtu, priv->admin_mtu);
187
188 return 0;
189}
190
37c22a77 191static struct ipoib_path *__path_find(struct net_device *dev, void *gid)
1da177e4
LT		 192{
193 struct ipoib_dev_priv *priv = netdev_priv(dev);
194 struct rb_node *n = priv->path_tree.rb_node;
195 struct ipoib_path *path;
196 int ret;
197
198 while (n) {
199 path = rb_entry(n, struct ipoib_path, rb_node);
200
37c22a77 201 ret = memcmp(gid, path->pathrec.dgid.raw,
1da177e4
LT		 202 sizeof (union ib_gid));
203
204 if (ret < 0)
205 n = n->rb_left;
206 else if (ret > 0)
207 n = n->rb_right;
208 else
209 return path;
210 }
211
212 return NULL;
213}
214
215static int __path_add(struct net_device *dev, struct ipoib_path *path)
216{
217 struct ipoib_dev_priv *priv = netdev_priv(dev);
218 struct rb_node **n = &priv->path_tree.rb_node;
219 struct rb_node *pn = NULL;
220 struct ipoib_path *tpath;
221 int ret;
222
223 while (*n) {
224 pn = *n;
225 tpath = rb_entry(pn, struct ipoib_path, rb_node);
226
227 ret = memcmp(path->pathrec.dgid.raw, tpath->pathrec.dgid.raw,
228 sizeof (union ib_gid));
229 if (ret < 0)
230 n = &pn->rb_left;
231 else if (ret > 0)
232 n = &pn->rb_right;
233 else
234 return -EEXIST;
235 }
236
237 rb_link_node(&path->rb_node, pn, n);
238 rb_insert_color(&path->rb_node, &priv->path_tree);
239
240 list_add_tail(&path->list, &priv->path_list);
241
242 return 0;
243}
244
245static void path_free(struct net_device *dev, struct ipoib_path *path)
246{
247 struct ipoib_dev_priv *priv = netdev_priv(dev);
248 struct ipoib_neigh *neigh, *tn;
249 struct sk_buff *skb;
250 unsigned long flags;
251
252 while ((skb = __skb_dequeue(&path->queue)))
253 dev_kfree_skb_irq(skb);
254
255 spin_lock_irqsave(&priv->lock, flags);
256
257 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
258 /*
259 * It's safe to call ipoib_put_ah() inside priv->lock
260 * here, because we know that path->ah will always
261 * hold one more reference, so ipoib_put_ah() will
262 * never do more than decrement the ref count.
263 */
264 if (neigh->ah)
265 ipoib_put_ah(neigh->ah);
d2e0655e
MT		 266
267 ipoib_neigh_free(neigh);
1da177e4
LT		 268 }
269
270 spin_unlock_irqrestore(&priv->lock, flags);
271
272 if (path->ah)
273 ipoib_put_ah(path->ah);
274
275 kfree(path);
276}
277
1732b0ef
RD		 278#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
279
280struct ipoib_path_iter *ipoib_path_iter_init(struct net_device *dev)
281{
282 struct ipoib_path_iter *iter;
283
284 iter = kmalloc(sizeof *iter, GFP_KERNEL);
285 if (!iter)
286 return NULL;
287
288 iter->dev = dev;
289 memset(iter->path.pathrec.dgid.raw, 0, 16);
290
291 if (ipoib_path_iter_next(iter)) {
292 kfree(iter);
293 return NULL;
294 }
295
296 return iter;
297}
298
299int ipoib_path_iter_next(struct ipoib_path_iter *iter)
300{
301 struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
302 struct rb_node *n;
303 struct ipoib_path *path;
304 int ret = 1;
305
306 spin_lock_irq(&priv->lock);
307
308 n = rb_first(&priv->path_tree);
309
310 while (n) {
311 path = rb_entry(n, struct ipoib_path, rb_node);
312
313 if (memcmp(iter->path.pathrec.dgid.raw, path->pathrec.dgid.raw,
314 sizeof (union ib_gid)) < 0) {
315 iter->path = *path;
316 ret = 0;
317 break;
318 }
319
320 n = rb_next(n);
321 }
322
323 spin_unlock_irq(&priv->lock);
324
325 return ret;
326}
327
328void ipoib_path_iter_read(struct ipoib_path_iter *iter,
329 struct ipoib_path *path)
330{
331 *path = iter->path;
332}
333
334#endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
335
1da177e4
LT		 336void ipoib_flush_paths(struct net_device *dev)
337{
338 struct ipoib_dev_priv *priv = netdev_priv(dev);
339 struct ipoib_path *path, *tp;
340 LIST_HEAD(remove_list);
1da177e4 341
9217b27b
MT		 342 spin_lock_irq(&priv->tx_lock);
343 spin_lock(&priv->lock);
1da177e4
LT		 344
345 list_splice(&priv->path_list, &remove_list);
346 INIT_LIST_HEAD(&priv->path_list);
347
348 list_for_each_entry(path, &remove_list, list)
349 rb_erase(&path->rb_node, &priv->path_tree);
350
1da177e4
LT		 351 list_for_each_entry_safe(path, tp, &remove_list, list) {
352 if (path->query)
353 ib_sa_cancel_query(path->query_id, path->query);
9217b27b
MT		 354 spin_unlock(&priv->lock);
355 spin_unlock_irq(&priv->tx_lock);
1da177e4
LT		 356 wait_for_completion(&path->done);
357 path_free(dev, path);
9217b27b
MT		 358 spin_lock_irq(&priv->tx_lock);
359 spin_lock(&priv->lock);
1da177e4 360 }
9217b27b
MT		 361 spin_unlock(&priv->lock);
362 spin_unlock_irq(&priv->tx_lock);
1da177e4
LT		 363}
364
365static void path_rec_completion(int status,
366 struct ib_sa_path_rec *pathrec,
367 void *path_ptr)
368{
369 struct ipoib_path *path = path_ptr;
370 struct net_device *dev = path->dev;
371 struct ipoib_dev_priv *priv = netdev_priv(dev);
372 struct ipoib_ah *ah = NULL;
373 struct ipoib_neigh *neigh;
374 struct sk_buff_head skqueue;
375 struct sk_buff *skb;
376 unsigned long flags;
377
378 if (pathrec)
379 ipoib_dbg(priv, "PathRec LID 0x%04x for GID " IPOIB_GID_FMT "\n",
380 be16_to_cpu(pathrec->dlid), IPOIB_GID_ARG(pathrec->dgid));
381 else
382 ipoib_dbg(priv, "PathRec status %d for GID " IPOIB_GID_FMT "\n",
383 status, IPOIB_GID_ARG(path->pathrec.dgid));
384
385 skb_queue_head_init(&skqueue);
386
387 if (!status) {
388 struct ib_ah_attr av = {
389 .dlid = be16_to_cpu(pathrec->dlid),
390 .sl = pathrec->sl,
bf6a9e31
JM		 391 .port_num = priv->port,
392 .static_rate = pathrec->rate
1da177e4 393 };
1da177e4
LT		 394
395 ah = ipoib_create_ah(dev, priv->pd, &av);
396 }
397
398 spin_lock_irqsave(&priv->lock, flags);
399
400 path->ah = ah;
401
402 if (ah) {
403 path->pathrec = *pathrec;
404
405 ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n",
406 ah, be16_to_cpu(pathrec->dlid), pathrec->sl);
407
408 while ((skb = __skb_dequeue(&path->queue)))
409 __skb_queue_tail(&skqueue, skb);
410
411 list_for_each_entry(neigh, &path->neigh_list, list) {
412 kref_get(&path->ah->ref);
413 neigh->ah = path->ah;
8a7f7521
MT		 414 memcpy(&neigh->dgid.raw, &path->pathrec.dgid.raw,
415 sizeof(union ib_gid));
1da177e4
LT		 416
417 while ((skb = __skb_dequeue(&neigh->queue)))
418 __skb_queue_tail(&skqueue, skb);
419 }
5872a9fc 420 }
1da177e4 421
5872a9fc 422 path->query = NULL;
1da177e4
LT		 423 complete(&path->done);
424
425 spin_unlock_irqrestore(&priv->lock, flags);
426
427 while ((skb = __skb_dequeue(&skqueue))) {
428 skb->dev = dev;
429 if (dev_queue_xmit(skb))
430 ipoib_warn(priv, "dev_queue_xmit failed "
431 "to requeue packet\n");
432 }
433}
434
37c22a77 435static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid)
1da177e4
LT		 436{
437 struct ipoib_dev_priv *priv = netdev_priv(dev);
438 struct ipoib_path *path;
439
21a38489 440 path = kzalloc(sizeof *path, GFP_ATOMIC);
1da177e4
LT		 441 if (!path)
442 return NULL;
443
21a38489 444 path->dev = dev;
1da177e4
LT		 445
446 skb_queue_head_init(&path->queue);
447
448 INIT_LIST_HEAD(&path->neigh_list);
1da177e4 449
37c22a77 450 memcpy(path->pathrec.dgid.raw, gid, sizeof (union ib_gid));
1da177e4
LT		 451 path->pathrec.sgid = priv->local_gid;
452 path->pathrec.pkey = cpu_to_be16(priv->pkey);
453 path->pathrec.numb_path = 1;
454
455 return path;
456}
457
458static int path_rec_start(struct net_device *dev,
459 struct ipoib_path *path)
460{
461 struct ipoib_dev_priv *priv = netdev_priv(dev);
462
463 ipoib_dbg(priv, "Start path record lookup for " IPOIB_GID_FMT "\n",
464 IPOIB_GID_ARG(path->pathrec.dgid));
465
65c7edda
RD		 466 init_completion(&path->done);
467
1da177e4 468 path->query_id =
c1a0b23b 469 ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port,
1da177e4
LT		 470 &path->pathrec,
471 IB_SA_PATH_REC_DGID |
472 IB_SA_PATH_REC_SGID |
473 IB_SA_PATH_REC_NUMB_PATH |
474 IB_SA_PATH_REC_PKEY,
475 1000, GFP_ATOMIC,
476 path_rec_completion,
477 path, &path->query);
478 if (path->query_id < 0) {
479 ipoib_warn(priv, "ib_sa_path_rec_get failed\n");
480 path->query = NULL;
481 return path->query_id;
482 }
483
484 return 0;
485}
486
487static void neigh_add_path(struct sk_buff *skb, struct net_device *dev)
488{
489 struct ipoib_dev_priv *priv = netdev_priv(dev);
490 struct ipoib_path *path;
491 struct ipoib_neigh *neigh;
492
d2e0655e 493 neigh = ipoib_neigh_alloc(skb->dst->neighbour);
1da177e4
LT		 494 if (!neigh) {
495 ++priv->stats.tx_dropped;
496 dev_kfree_skb_any(skb);
497 return;
498 }
499
500 skb_queue_head_init(&neigh->queue);
1da177e4
LT		 501
502 /*
503 * We can only be called from ipoib_start_xmit, so we're
504 * inside tx_lock -- no need to save/restore flags.
505 */
506 spin_lock(&priv->lock);
507
37c22a77 508 path = __path_find(dev, skb->dst->neighbour->ha + 4);
1da177e4 509 if (!path) {
37c22a77 510 path = path_rec_create(dev, skb->dst->neighbour->ha + 4);
1da177e4 511 if (!path)
d2e0655e 512 goto err_path;
1da177e4
LT		 513
514 __path_add(dev, path);
515 }
516
517 list_add_tail(&neigh->list, &path->neigh_list);
518
47f7a071 519 if (path->ah) {
1da177e4
LT		 520 kref_get(&path->ah->ref);
521 neigh->ah = path->ah;
8a7f7521
MT		 522 memcpy(&neigh->dgid.raw, &path->pathrec.dgid.raw,
523 sizeof(union ib_gid));
1da177e4 524
073ae841 525 ipoib_send(dev, skb, path->ah, IPOIB_QPN(skb->dst->neighbour->ha));
1da177e4
LT		 526 } else {
527 neigh->ah = NULL;
bfef73fa 528 __skb_queue_tail(&neigh->queue, skb);
1da177e4
LT		 529
530 if (!path->query && path_rec_start(dev, path))
d2e0655e 531 goto err_list;
1da177e4
LT		 532 }
533
534 spin_unlock(&priv->lock);
535 return;
536
d2e0655e 537err_list:
1da177e4 538 list_del(&neigh->list);
1da177e4 539
d2e0655e
MT		 540err_path:
541 ipoib_neigh_free(neigh);
1da177e4
LT		 542 ++priv->stats.tx_dropped;
543 dev_kfree_skb_any(skb);
544
545 spin_unlock(&priv->lock);
546}
547
d70ed607 548static void ipoib_path_lookup(struct sk_buff *skb, struct net_device *dev)
1da177e4
LT		 549{
550 struct ipoib_dev_priv *priv = netdev_priv(skb->dev);
551
552 /* Look up path record for unicasts */
553 if (skb->dst->neighbour->ha[4] != 0xff) {
554 neigh_add_path(skb, dev);
555 return;
556 }
557
558 /* Add in the P_Key for multicasts */
559 skb->dst->neighbour->ha[8] = (priv->pkey >> 8) & 0xff;
560 skb->dst->neighbour->ha[9] = priv->pkey & 0xff;
37c22a77 561 ipoib_mcast_send(dev, skb->dst->neighbour->ha + 4, skb);
1da177e4
LT		 562}
563
564static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
565 struct ipoib_pseudoheader *phdr)
566{
567 struct ipoib_dev_priv *priv = netdev_priv(dev);
568 struct ipoib_path *path;
569
570 /*
571 * We can only be called from ipoib_start_xmit, so we're
572 * inside tx_lock -- no need to save/restore flags.
573 */
574 spin_lock(&priv->lock);
575
37c22a77 576 path = __path_find(dev, phdr->hwaddr + 4);
1da177e4 577 if (!path) {
37c22a77 578 path = path_rec_create(dev, phdr->hwaddr + 4);
1da177e4
LT		 579 if (path) {
580 /* put pseudoheader back on for next time */
581 skb_push(skb, sizeof *phdr);
582 __skb_queue_tail(&path->queue, skb);
583
584 if (path_rec_start(dev, path)) {
585 spin_unlock(&priv->lock);
586 path_free(dev, path);
587 return;
588 } else
589 __path_add(dev, path);
590 } else {
591 ++priv->stats.tx_dropped;
592 dev_kfree_skb_any(skb);
593 }
594
595 spin_unlock(&priv->lock);
596 return;
597 }
598
47f7a071 599 if (path->ah) {
1da177e4
LT		 600 ipoib_dbg(priv, "Send unicast ARP to %04x\n",
601 be16_to_cpu(path->pathrec.dlid));
602
073ae841 603 ipoib_send(dev, skb, path->ah, IPOIB_QPN(phdr->hwaddr));
1da177e4
LT		 604 } else if ((path->query || !path_rec_start(dev, path)) &&
605 skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
606 /* put pseudoheader back on for next time */
607 skb_push(skb, sizeof *phdr);
608 __skb_queue_tail(&path->queue, skb);
609 } else {
610 ++priv->stats.tx_dropped;
611 dev_kfree_skb_any(skb);
612 }
613
614 spin_unlock(&priv->lock);
615}
616
617static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
618{
619 struct ipoib_dev_priv *priv = netdev_priv(dev);
620 struct ipoib_neigh *neigh;
621 unsigned long flags;
622
a8bfca02 623 if (unlikely(!spin_trylock_irqsave(&priv->tx_lock, flags)))
1da177e4 624 return NETDEV_TX_LOCKED;
1da177e4
LT		 625
626 /*
627 * Check if our queue is stopped. Since we have the LLTX bit
628 * set, we can't rely on netif_stop_queue() preventing our
629 * xmit function from being called with a full queue.
630 */
631 if (unlikely(netif_queue_stopped(dev))) {
632 spin_unlock_irqrestore(&priv->tx_lock, flags);
633 return NETDEV_TX_BUSY;
634 }
635
a8bfca02 636 if (likely(skb->dst && skb->dst->neighbour)) {
1da177e4 637 if (unlikely(!*to_ipoib_neigh(skb->dst->neighbour))) {
d70ed607 638 ipoib_path_lookup(skb, dev);
1da177e4
LT		 639 goto out;
640 }
641
642 neigh = *to_ipoib_neigh(skb->dst->neighbour);
643
644 if (likely(neigh->ah)) {
8a7f7521
MT		 645 if (unlikely(memcmp(&neigh->dgid.raw,
646 skb->dst->neighbour->ha + 4,
647 sizeof(union ib_gid)))) {
648 spin_lock(&priv->lock);
649 /*
650 * It's safe to call ipoib_put_ah() inside
651 * priv->lock here, because we know that
652 * path->ah will always hold one more reference,
653 * so ipoib_put_ah() will never do more than
654 * decrement the ref count.
655 */
656 ipoib_put_ah(neigh->ah);
657 list_del(&neigh->list);
658 ipoib_neigh_free(neigh);
659 spin_unlock(&priv->lock);
660 ipoib_path_lookup(skb, dev);
661 goto out;
662 }
663
073ae841 664 ipoib_send(dev, skb, neigh->ah, IPOIB_QPN(skb->dst->neighbour->ha));
1da177e4
LT		 665 goto out;
666 }
667
668 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
669 spin_lock(&priv->lock);
670 __skb_queue_tail(&neigh->queue, skb);
671 spin_unlock(&priv->lock);
672 } else {
673 ++priv->stats.tx_dropped;
674 dev_kfree_skb_any(skb);
675 }
676 } else {
677 struct ipoib_pseudoheader *phdr =
678 (struct ipoib_pseudoheader *) skb->data;
679 skb_pull(skb, sizeof *phdr);
680
681 if (phdr->hwaddr[4] == 0xff) {
682 /* Add in the P_Key for multicast*/
683 phdr->hwaddr[8] = (priv->pkey >> 8) & 0xff;
684 phdr->hwaddr[9] = priv->pkey & 0xff;
685
37c22a77 686 ipoib_mcast_send(dev, phdr->hwaddr + 4, skb);
1da177e4 687 } else {
0dca0f7b 688 /* unicast GID -- should be ARP or RARP reply */
1da177e4 689
0dca0f7b
HR		 690 if ((be16_to_cpup((__be16 *) skb->data) != ETH_P_ARP) &&
691 (be16_to_cpup((__be16 *) skb->data) != ETH_P_RARP)) {
1da177e4
LT		 692 ipoib_warn(priv, "Unicast, no %s: type %04x, QPN %06x "
693 IPOIB_GID_FMT "\n",
694 skb->dst ? "neigh" : "dst",
97f52eb4 695 be16_to_cpup((__be16 *) skb->data),
073ae841 696 IPOIB_QPN(phdr->hwaddr),
37c22a77 697 IPOIB_GID_RAW_ARG(phdr->hwaddr + 4));
1da177e4
LT		 698 dev_kfree_skb_any(skb);
699 ++priv->stats.tx_dropped;
700 goto out;
701 }
702
703 unicast_arp_send(skb, dev, phdr);
704 }
705 }
706
707out:
708 spin_unlock_irqrestore(&priv->tx_lock, flags);
709
710 return NETDEV_TX_OK;
711}
712
713static struct net_device_stats *ipoib_get_stats(struct net_device *dev)
714{
715 struct ipoib_dev_priv *priv = netdev_priv(dev);
716
717 return &priv->stats;
718}
719
720static void ipoib_timeout(struct net_device *dev)
721{
722 struct ipoib_dev_priv *priv = netdev_priv(dev);
723
4b2d319b
RD		 724 ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
725 jiffies_to_msecs(jiffies - dev->trans_start));
726 ipoib_warn(priv, "queue stopped %d, tx_head %u, tx_tail %u\n",
727 netif_queue_stopped(dev),
728 priv->tx_head, priv->tx_tail);
1da177e4
LT		 729 /* XXX reset QP, etc. */
730}
731
732static int ipoib_hard_header(struct sk_buff *skb,
733 struct net_device *dev,
734 unsigned short type,
735 void *daddr, void *saddr, unsigned len)
736{
737 struct ipoib_header *header;
738
739 header = (struct ipoib_header *) skb_push(skb, sizeof *header);
740
741 header->proto = htons(type);
742 header->reserved = 0;
743
744 /*
745 * If we don't have a neighbour structure, stuff the
746 * destination address onto the front of the skb so we can
747 * figure out where to send the packet later.
748 */
ef12d456 749 if ((!skb->dst || !skb->dst->neighbour) && daddr) {
1da177e4
LT		 750 struct ipoib_pseudoheader *phdr =
751 (struct ipoib_pseudoheader *) skb_push(skb, sizeof *phdr);
752 memcpy(phdr->hwaddr, daddr, INFINIBAND_ALEN);
753 }
754
755 return 0;
756}
757
758static void ipoib_set_mcast_list(struct net_device *dev)
759{
760 struct ipoib_dev_priv *priv = netdev_priv(dev);
761
7a343d4c
LA		 762 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
763 ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set");
764 return;
765 }
766
1ad62a19 767 queue_work(ipoib_workqueue, &priv->restart_task);
1da177e4
LT		 768}
769
770static void ipoib_neigh_destructor(struct neighbour *n)
771{
772 struct ipoib_neigh *neigh;
773 struct ipoib_dev_priv *priv = netdev_priv(n->dev);
774 unsigned long flags;
775 struct ipoib_ah *ah = NULL;
776
777 ipoib_dbg(priv,
778 "neigh_destructor for %06x " IPOIB_GID_FMT "\n",
073ae841 779 IPOIB_QPN(n->ha),
37c22a77 780 IPOIB_GID_RAW_ARG(n->ha + 4));
1da177e4
LT		 781
782 spin_lock_irqsave(&priv->lock, flags);
783
784 neigh = *to_ipoib_neigh(n);
785 if (neigh) {
786 if (neigh->ah)
787 ah = neigh->ah;
788 list_del(&neigh->list);
d2e0655e 789 ipoib_neigh_free(neigh);
1da177e4
LT		 790 }
791
792 spin_unlock_irqrestore(&priv->lock, flags);
793
794 if (ah)
795 ipoib_put_ah(ah);
796}
797
d2e0655e
MT		 798struct ipoib_neigh *ipoib_neigh_alloc(struct neighbour *neighbour)
799{
800 struct ipoib_neigh *neigh;
801
802 neigh = kmalloc(sizeof *neigh, GFP_ATOMIC);
803 if (!neigh)
804 return NULL;
805
806 neigh->neighbour = neighbour;
807 *to_ipoib_neigh(neighbour) = neigh;
808
809 return neigh;
810}
811
812void ipoib_neigh_free(struct ipoib_neigh *neigh)
813{
814 *to_ipoib_neigh(neigh->neighbour) = NULL;
815 kfree(neigh);
816}
817
1da177e4
LT		 818static int ipoib_neigh_setup_dev(struct net_device *dev, struct neigh_parms *parms)
819{
c5ecd62c 820 parms->neigh_destructor = ipoib_neigh_destructor;
1da177e4
LT		 821
822 return 0;
823}
824
825int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
826{
827 struct ipoib_dev_priv *priv = netdev_priv(dev);
828
829 /* Allocate RX/TX "rings" to hold queued skbs */
0f485251 830 priv->rx_ring = kzalloc(ipoib_recvq_size * sizeof *priv->rx_ring,
1da177e4
LT		 831 GFP_KERNEL);
832 if (!priv->rx_ring) {
833 printk(KERN_WARNING "%s: failed to allocate RX ring (%d entries)\n",
0f485251 834 ca->name, ipoib_recvq_size);
1da177e4
LT		 835 goto out;
836 }
1da177e4 837
0f485251 838 priv->tx_ring = kzalloc(ipoib_sendq_size * sizeof *priv->tx_ring,
1da177e4
LT		 839 GFP_KERNEL);
840 if (!priv->tx_ring) {
841 printk(KERN_WARNING "%s: failed to allocate TX ring (%d entries)\n",
0f485251 842 ca->name, ipoib_sendq_size);
1da177e4
LT		 843 goto out_rx_ring_cleanup;
844 }
1da177e4
LT		 845
846 /* priv->tx_head & tx_tail are already 0 */
847
848 if (ipoib_ib_dev_init(dev, ca, port))
849 goto out_tx_ring_cleanup;
850
851 return 0;
852
853out_tx_ring_cleanup:
854 kfree(priv->tx_ring);
855
856out_rx_ring_cleanup:
857 kfree(priv->rx_ring);
858
859out:
860 return -ENOMEM;
861}
862
863void ipoib_dev_cleanup(struct net_device *dev)
864{
865 struct ipoib_dev_priv *priv = netdev_priv(dev), *cpriv, *tcpriv;
866
1732b0ef 867 ipoib_delete_debug_files(dev);
1da177e4
LT		 868
869 /* Delete any child interfaces first */
870 list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) {
871 unregister_netdev(cpriv->dev);
872 ipoib_dev_cleanup(cpriv->dev);
873 free_netdev(cpriv->dev);
874 }
875
876 ipoib_ib_dev_cleanup(dev);
877
92a6b34b
HR		 878 kfree(priv->rx_ring);
879 kfree(priv->tx_ring);
1da177e4 880
92a6b34b
HR		 881 priv->rx_ring = NULL;
882 priv->tx_ring = NULL;
1da177e4
LT		 883}
884
885static void ipoib_setup(struct net_device *dev)
886{
887 struct ipoib_dev_priv *priv = netdev_priv(dev);
888
889 dev->open = ipoib_open;
890 dev->stop = ipoib_stop;
891 dev->change_mtu = ipoib_change_mtu;
892 dev->hard_start_xmit = ipoib_start_xmit;
893 dev->get_stats = ipoib_get_stats;
894 dev->tx_timeout = ipoib_timeout;
895 dev->hard_header = ipoib_hard_header;
896 dev->set_multicast_list = ipoib_set_mcast_list;
897 dev->neigh_setup = ipoib_neigh_setup_dev;
898
899 dev->watchdog_timeo = HZ;
900
1da177e4
LT		 901 dev->flags |= IFF_BROADCAST | IFF_MULTICAST;
902
903 /*
904 * We add in INFINIBAND_ALEN to allow for the destination
905 * address "pseudoheader" for skbs without neighbour struct.
906 */
907 dev->hard_header_len = IPOIB_ENCAP_LEN + INFINIBAND_ALEN;
908 dev->addr_len = INFINIBAND_ALEN;
909 dev->type = ARPHRD_INFINIBAND;
0f485251 910 dev->tx_queue_len = ipoib_sendq_size * 2;
1da177e4
LT		 911 dev->features = NETIF_F_VLAN_CHALLENGED | NETIF_F_LLTX;
912
913 /* MTU will be reset when mcast join happens */
914 dev->mtu = IPOIB_PACKET_SIZE - IPOIB_ENCAP_LEN;
915 priv->mcast_mtu = priv->admin_mtu = dev->mtu;
916
917 memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN);
918
919 netif_carrier_off(dev);
920
921 SET_MODULE_OWNER(dev);
922
923 priv->dev = dev;
924
925 spin_lock_init(&priv->lock);
926 spin_lock_init(&priv->tx_lock);
927
95ed644f
IM		 928 mutex_init(&priv->mcast_mutex);
929 mutex_init(&priv->vlan_mutex);
1da177e4
LT		 930
931 INIT_LIST_HEAD(&priv->path_list);
932 INIT_LIST_HEAD(&priv->child_intfs);
933 INIT_LIST_HEAD(&priv->dead_ahs);
934 INIT_LIST_HEAD(&priv->multicast_list);
935
936 INIT_WORK(&priv->pkey_task, ipoib_pkey_poll, priv->dev);
937 INIT_WORK(&priv->mcast_task, ipoib_mcast_join_task, priv->dev);
938 INIT_WORK(&priv->flush_task, ipoib_ib_dev_flush, priv->dev);
939 INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task, priv->dev);
940 INIT_WORK(&priv->ah_reap_task, ipoib_reap_ah, priv->dev);
941}
942
943struct ipoib_dev_priv *ipoib_intf_alloc(const char *name)
944{
945 struct net_device *dev;
946
947 dev = alloc_netdev((int) sizeof (struct ipoib_dev_priv), name,
948 ipoib_setup);
949 if (!dev)
950 return NULL;
951
952 return netdev_priv(dev);
953}
954
955static ssize_t show_pkey(struct class_device *cdev, char *buf)
956{
957 struct ipoib_dev_priv *priv =
958 netdev_priv(container_of(cdev, struct net_device, class_dev));
959
960 return sprintf(buf, "0x%04x\n", priv->pkey);
961}
962static CLASS_DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
963
964static ssize_t create_child(struct class_device *cdev,
965 const char *buf, size_t count)
966{
967 int pkey;
968 int ret;
969
970 if (sscanf(buf, "%i", &pkey) != 1)
971 return -EINVAL;
972
973 if (pkey < 0 || pkey > 0xffff)
974 return -EINVAL;
975
4ce05937
RD		 976 /*
977 * Set the full membership bit, so that we join the right
978 * broadcast group, etc.
979 */
980 pkey |= 0x8000;
981
1da177e4
LT		 982 ret = ipoib_vlan_add(container_of(cdev, struct net_device, class_dev),
983 pkey);
984
985 return ret ? ret : count;
986}
987static CLASS_DEVICE_ATTR(create_child, S_IWUGO, NULL, create_child);
988
989static ssize_t delete_child(struct class_device *cdev,
990 const char *buf, size_t count)
991{
992 int pkey;
993 int ret;
994
995 if (sscanf(buf, "%i", &pkey) != 1)
996 return -EINVAL;
997
998 if (pkey < 0 || pkey > 0xffff)
999 return -EINVAL;
1000
1001 ret = ipoib_vlan_delete(container_of(cdev, struct net_device, class_dev),
1002 pkey);
1003
1004 return ret ? ret : count;
1005
1006}
1007static CLASS_DEVICE_ATTR(delete_child, S_IWUGO, NULL, delete_child);
1008
1009int ipoib_add_pkey_attr(struct net_device *dev)
1010{
1011 return class_device_create_file(&dev->class_dev,
1012 &class_device_attr_pkey);
1013}
1014
1015static struct net_device *ipoib_add_port(const char *format,
1016 struct ib_device *hca, u8 port)
1017{
1018 struct ipoib_dev_priv *priv;
1019 int result = -ENOMEM;
1020
1021 priv = ipoib_intf_alloc(format);
1022 if (!priv)
1023 goto alloc_mem_failed;
1024
1025 SET_NETDEV_DEV(priv->dev, hca->dma_device);
1026
1027 result = ib_query_pkey(hca, port, 0, &priv->pkey);
1028 if (result) {
1029 printk(KERN_WARNING "%s: ib_query_pkey port %d failed (ret = %d)\n",
1030 hca->name, port, result);
1031 goto alloc_mem_failed;
1032 }
1033
4ce05937
RD		 1034 /*
1035 * Set the full membership bit, so that we join the right
1036 * broadcast group, etc.
1037 */
1038 priv->pkey |= 0x8000;
1039
1da177e4
LT		 1040 priv->dev->broadcast[8] = priv->pkey >> 8;
1041 priv->dev->broadcast[9] = priv->pkey & 0xff;
1042
1043 result = ib_query_gid(hca, port, 0, &priv->local_gid);
1044 if (result) {
1045 printk(KERN_WARNING "%s: ib_query_gid port %d failed (ret = %d)\n",
1046 hca->name, port, result);
1047 goto alloc_mem_failed;
1048 } else
1049 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
1050
1051
1052 result = ipoib_dev_init(priv->dev, hca, port);
1053 if (result < 0) {
1054 printk(KERN_WARNING "%s: failed to initialize port %d (ret = %d)\n",
1055 hca->name, port, result);
1056 goto device_init_failed;
1057 }
1058
1059 INIT_IB_EVENT_HANDLER(&priv->event_handler,
1060 priv->ca, ipoib_event);
1061 result = ib_register_event_handler(&priv->event_handler);
1062 if (result < 0) {
1063 printk(KERN_WARNING "%s: ib_register_event_handler failed for "
1064 "port %d (ret = %d)\n",
1065 hca->name, port, result);
1066 goto event_failed;
1067 }
1068
1069 result = register_netdev(priv->dev);
1070 if (result) {
1071 printk(KERN_WARNING "%s: couldn't register ipoib port %d; error %d\n",
1072 hca->name, port, result);
1073 goto register_failed;
1074 }
1075
1732b0ef 1076 ipoib_create_debug_files(priv->dev);
1da177e4
LT		 1077
1078 if (ipoib_add_pkey_attr(priv->dev))
1079 goto sysfs_failed;
1080 if (class_device_create_file(&priv->dev->class_dev,
1081 &class_device_attr_create_child))
1082 goto sysfs_failed;
1083 if (class_device_create_file(&priv->dev->class_dev,
1084 &class_device_attr_delete_child))
1085 goto sysfs_failed;
1086
1087 return priv->dev;
1088
1089sysfs_failed:
1732b0ef 1090 ipoib_delete_debug_files(priv->dev);
1da177e4
LT		 1091 unregister_netdev(priv->dev);
1092
1093register_failed:
1094 ib_unregister_event_handler(&priv->event_handler);
51574e03 1095 flush_scheduled_work();
1da177e4
LT		 1096
1097event_failed:
1098 ipoib_dev_cleanup(priv->dev);
1099
1100device_init_failed:
1101 free_netdev(priv->dev);
1102
1103alloc_mem_failed:
1104 return ERR_PTR(result);
1105}
1106
1107static void ipoib_add_one(struct ib_device *device)
1108{
1109 struct list_head *dev_list;
1110 struct net_device *dev;
1111 struct ipoib_dev_priv *priv;
1112 int s, e, p;
1113
07ebafba
TT		 1114 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1115 return;
1116
1da177e4
LT		 1117 dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
1118 if (!dev_list)
1119 return;
1120
1121 INIT_LIST_HEAD(dev_list);
1122
07ebafba 1123 if (device->node_type == RDMA_NODE_IB_SWITCH) {
1da177e4
LT		 1124 s = 0;
1125 e = 0;
1126 } else {
1127 s = 1;
1128 e = device->phys_port_cnt;
1129 }
1130
1131 for (p = s; p <= e; ++p) {
1132 dev = ipoib_add_port("ib%d", device, p);
1133 if (!IS_ERR(dev)) {
1134 priv = netdev_priv(dev);
1135 list_add_tail(&priv->list, dev_list);
1136 }
1137 }
1138
1139 ib_set_client_data(device, &ipoib_client, dev_list);
1140}
1141
1142static void ipoib_remove_one(struct ib_device *device)
1143{
1144 struct ipoib_dev_priv *priv, *tmp;
1145 struct list_head *dev_list;
1146
07ebafba
TT		 1147 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1148 return;
1149
1da177e4
LT		 1150 dev_list = ib_get_client_data(device, &ipoib_client);
1151
1152 list_for_each_entry_safe(priv, tmp, dev_list, list) {
1153 ib_unregister_event_handler(&priv->event_handler);
51574e03 1154 flush_scheduled_work();
1da177e4
LT		 1155
1156 unregister_netdev(priv->dev);
1157 ipoib_dev_cleanup(priv->dev);
1158 free_netdev(priv->dev);
1159 }
06c56e44
MT		 1160
1161 kfree(dev_list);
1da177e4
LT		 1162}
1163
1164static int __init ipoib_init_module(void)
1165{
1166 int ret;
1167
0f485251
SM		 1168 ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size);
1169 ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE);
1170 ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE);
1171
1172 ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size);
1173 ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE);
1174 ipoib_sendq_size = max(ipoib_sendq_size, IPOIB_MIN_QUEUE_SIZE);
1175
1da177e4
LT		 1176 ret = ipoib_register_debugfs();
1177 if (ret)
1178 return ret;
1179
1180 /*
1181 * We create our own workqueue mainly because we want to be
1182 * able to flush it when devices are being removed. We can't
1183 * use schedule_work()/flush_scheduled_work() because both
1184 * unregister_netdev() and linkwatch_event take the rtnl lock,
1185 * so flush_scheduled_work() can deadlock during device
1186 * removal.
1187 */
1188 ipoib_workqueue = create_singlethread_workqueue("ipoib");
1189 if (!ipoib_workqueue) {
1190 ret = -ENOMEM;
1191 goto err_fs;
1192 }
1193
c1a0b23b
MT		 1194 ib_sa_register_client(&ipoib_sa_client);
1195
1da177e4
LT		 1196 ret = ib_register_client(&ipoib_client);
1197 if (ret)
c1a0b23b 1198 goto err_sa;
1da177e4
LT		 1199
1200 return 0;
1201
c1a0b23b
MT		 1202err_sa:
1203 ib_sa_unregister_client(&ipoib_sa_client);
1da177e4
LT		 1204 destroy_workqueue(ipoib_workqueue);
1205
9adec1a8
RD		 1206err_fs:
1207 ipoib_unregister_debugfs();
1208
1da177e4
LT		 1209 return ret;
1210}
1211
1212static void __exit ipoib_cleanup_module(void)
1213{
1da177e4 1214 ib_unregister_client(&ipoib_client);
c1a0b23b 1215 ib_sa_unregister_client(&ipoib_sa_client);
9adec1a8 1216 ipoib_unregister_debugfs();
1da177e4
LT		 1217 destroy_workqueue(ipoib_workqueue);
1218}
1219
1220module_init(ipoib_init_module);
1221module_exit(ipoib_cleanup_module);
Linux 6.x block layer and io_uring tree(s)