1 /* 2 * Copyright (c) 2004 Topspin Communications. All rights reserved. 3 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved. 4 * Copyright (c) 2004 Voltaire, Inc. All rights reserved. 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 35 #include "ipoib.h" 36 37 #include <linux/module.h> 38 39 #include <linux/init.h> 40 #include <linux/slab.h> 41 #include <linux/kernel.h> 42 #include <linux/vmalloc.h> 43 44 #include <linux/if_arp.h> /* For ARPHRD_xxx */ 45 46 #include <linux/ip.h> 47 #include <linux/in.h> 48 49 #include <net/dst.h> 50 51 MODULE_AUTHOR("Roland Dreier"); 52 MODULE_DESCRIPTION("IP-over-InfiniBand net driver"); 53 MODULE_LICENSE("Dual BSD/GPL"); 54 55 int ipoib_sendq_size __read_mostly = IPOIB_TX_RING_SIZE; 56 int ipoib_recvq_size __read_mostly = IPOIB_RX_RING_SIZE; 57 58 module_param_named(send_queue_size, ipoib_sendq_size, int, 0444); 59 MODULE_PARM_DESC(send_queue_size, "Number of descriptors in send queue"); 60 module_param_named(recv_queue_size, ipoib_recvq_size, int, 0444); 61 MODULE_PARM_DESC(recv_queue_size, "Number of descriptors in receive queue"); 62 63 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG 64 int ipoib_debug_level; 65 66 module_param_named(debug_level, ipoib_debug_level, int, 0644); 67 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0"); 68 #endif 69 70 struct ipoib_path_iter { 71 struct net_device *dev; 72 struct ipoib_path path; 73 }; 74 75 static const u8 ipv4_bcast_addr[] = { 76 0x00, 0xff, 0xff, 0xff, 77 0xff, 0x12, 0x40, 0x1b, 0x00, 0x00, 0x00, 0x00, 78 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff 79 }; 80 81 struct workqueue_struct *ipoib_workqueue; 82 83 struct ib_sa_client ipoib_sa_client; 84 85 static void ipoib_add_one(struct ib_device *device); 86 static void ipoib_remove_one(struct ib_device *device); 87 88 static struct ib_client ipoib_client = { 89 .name = "ipoib", 90 .add = ipoib_add_one, 91 .remove = ipoib_remove_one 92 }; 93 94 int ipoib_open(struct net_device *dev) 95 { 96 struct ipoib_dev_priv *priv = netdev_priv(dev); 97 98 ipoib_dbg(priv, "bringing up interface\n"); 99 100 set_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags); 101 102 if (ipoib_pkey_dev_delay_open(dev)) 103 return 0; 104 105 if (ipoib_ib_dev_open(dev)) 106 goto err_disable; 107 108 if (ipoib_ib_dev_up(dev)) 109 goto err_stop; 110 111 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) { 112 struct ipoib_dev_priv *cpriv; 113 114 /* Bring up any child interfaces too */ 115 mutex_lock(&priv->vlan_mutex); 116 list_for_each_entry(cpriv, &priv->child_intfs, list) { 117 int flags; 118 119 flags = cpriv->dev->flags; 120 if (flags & IFF_UP) 121 continue; 122 123 dev_change_flags(cpriv->dev, flags | IFF_UP); 124 } 125 mutex_unlock(&priv->vlan_mutex); 126 } 127 128 netif_start_queue(dev); 129 130 return 0; 131 132 err_stop: 133 ipoib_ib_dev_stop(dev, 1); 134 135 err_disable: 136 clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags); 137 138 return -EINVAL; 139 } 140 141 static int ipoib_stop(struct net_device *dev) 142 { 143 struct ipoib_dev_priv *priv = netdev_priv(dev); 144 145 ipoib_dbg(priv, "stopping interface\n"); 146 147 clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags); 148 149 netif_stop_queue(dev); 150 151 ipoib_ib_dev_down(dev, 0); 152 ipoib_ib_dev_stop(dev, 0); 153 154 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) { 155 struct ipoib_dev_priv *cpriv; 156 157 /* Bring down any child interfaces too */ 158 mutex_lock(&priv->vlan_mutex); 159 list_for_each_entry(cpriv, &priv->child_intfs, list) { 160 int flags; 161 162 flags = cpriv->dev->flags; 163 if (!(flags & IFF_UP)) 164 continue; 165 166 dev_change_flags(cpriv->dev, flags & ~IFF_UP); 167 } 168 mutex_unlock(&priv->vlan_mutex); 169 } 170 171 return 0; 172 } 173 174 static netdev_features_t ipoib_fix_features(struct net_device *dev, netdev_features_t features) 175 { 176 struct ipoib_dev_priv *priv = netdev_priv(dev); 177 178 if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags)) 179 features &= ~(NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_TSO); 180 181 return features; 182 } 183 184 static int ipoib_change_mtu(struct net_device *dev, int new_mtu) 185 { 186 struct ipoib_dev_priv *priv = netdev_priv(dev); 187 188 /* dev->mtu > 2K ==> connected mode */ 189 if (ipoib_cm_admin_enabled(dev)) { 190 if (new_mtu > ipoib_cm_max_mtu(dev)) 191 return -EINVAL; 192 193 if (new_mtu > priv->mcast_mtu) 194 ipoib_warn(priv, "mtu > %d will cause multicast packet drops.\n", 195 priv->mcast_mtu); 196 197 dev->mtu = new_mtu; 198 return 0; 199 } 200 201 if (new_mtu > IPOIB_UD_MTU(priv->max_ib_mtu)) 202 return -EINVAL; 203 204 priv->admin_mtu = new_mtu; 205 206 dev->mtu = min(priv->mcast_mtu, priv->admin_mtu); 207 208 return 0; 209 } 210 211 static struct ipoib_path *__path_find(struct net_device *dev, void *gid) 212 { 213 struct ipoib_dev_priv *priv = netdev_priv(dev); 214 struct rb_node *n = priv->path_tree.rb_node; 215 struct ipoib_path *path; 216 int ret; 217 218 while (n) { 219 path = rb_entry(n, struct ipoib_path, rb_node); 220 221 ret = memcmp(gid, path->pathrec.dgid.raw, 222 sizeof (union ib_gid)); 223 224 if (ret < 0) 225 n = n->rb_left; 226 else if (ret > 0) 227 n = n->rb_right; 228 else 229 return path; 230 } 231 232 return NULL; 233 } 234 235 static int __path_add(struct net_device *dev, struct ipoib_path *path) 236 { 237 struct ipoib_dev_priv *priv = netdev_priv(dev); 238 struct rb_node **n = &priv->path_tree.rb_node; 239 struct rb_node *pn = NULL; 240 struct ipoib_path *tpath; 241 int ret; 242 243 while (*n) { 244 pn = *n; 245 tpath = rb_entry(pn, struct ipoib_path, rb_node); 246 247 ret = memcmp(path->pathrec.dgid.raw, tpath->pathrec.dgid.raw, 248 sizeof (union ib_gid)); 249 if (ret < 0) 250 n = &pn->rb_left; 251 else if (ret > 0) 252 n = &pn->rb_right; 253 else 254 return -EEXIST; 255 } 256 257 rb_link_node(&path->rb_node, pn, n); 258 rb_insert_color(&path->rb_node, &priv->path_tree); 259 260 list_add_tail(&path->list, &priv->path_list); 261 262 return 0; 263 } 264 265 static void path_free(struct net_device *dev, struct ipoib_path *path) 266 { 267 struct ipoib_dev_priv *priv = netdev_priv(dev); 268 struct ipoib_neigh *neigh, *tn; 269 struct sk_buff *skb; 270 unsigned long flags; 271 272 while ((skb = __skb_dequeue(&path->queue))) 273 dev_kfree_skb_irq(skb); 274 275 spin_lock_irqsave(&priv->lock, flags); 276 277 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) { 278 /* 279 * It's safe to call ipoib_put_ah() inside priv->lock 280 * here, because we know that path->ah will always 281 * hold one more reference, so ipoib_put_ah() will 282 * never do more than decrement the ref count. 283 */ 284 if (neigh->ah) 285 ipoib_put_ah(neigh->ah); 286 287 ipoib_neigh_free(dev, neigh); 288 } 289 290 spin_unlock_irqrestore(&priv->lock, flags); 291 292 if (path->ah) 293 ipoib_put_ah(path->ah); 294 295 kfree(path); 296 } 297 298 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG 299 300 struct ipoib_path_iter *ipoib_path_iter_init(struct net_device *dev) 301 { 302 struct ipoib_path_iter *iter; 303 304 iter = kmalloc(sizeof *iter, GFP_KERNEL); 305 if (!iter) 306 return NULL; 307 308 iter->dev = dev; 309 memset(iter->path.pathrec.dgid.raw, 0, 16); 310 311 if (ipoib_path_iter_next(iter)) { 312 kfree(iter); 313 return NULL; 314 } 315 316 return iter; 317 } 318 319 int ipoib_path_iter_next(struct ipoib_path_iter *iter) 320 { 321 struct ipoib_dev_priv *priv = netdev_priv(iter->dev); 322 struct rb_node *n; 323 struct ipoib_path *path; 324 int ret = 1; 325 326 spin_lock_irq(&priv->lock); 327 328 n = rb_first(&priv->path_tree); 329 330 while (n) { 331 path = rb_entry(n, struct ipoib_path, rb_node); 332 333 if (memcmp(iter->path.pathrec.dgid.raw, path->pathrec.dgid.raw, 334 sizeof (union ib_gid)) < 0) { 335 iter->path = *path; 336 ret = 0; 337 break; 338 } 339 340 n = rb_next(n); 341 } 342 343 spin_unlock_irq(&priv->lock); 344 345 return ret; 346 } 347 348 void ipoib_path_iter_read(struct ipoib_path_iter *iter, 349 struct ipoib_path *path) 350 { 351 *path = iter->path; 352 } 353 354 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */ 355 356 void ipoib_mark_paths_invalid(struct net_device *dev) 357 { 358 struct ipoib_dev_priv *priv = netdev_priv(dev); 359 struct ipoib_path *path, *tp; 360 361 spin_lock_irq(&priv->lock); 362 363 list_for_each_entry_safe(path, tp, &priv->path_list, list) { 364 ipoib_dbg(priv, "mark path LID 0x%04x GID %pI6 invalid\n", 365 be16_to_cpu(path->pathrec.dlid), 366 path->pathrec.dgid.raw); 367 path->valid = 0; 368 } 369 370 spin_unlock_irq(&priv->lock); 371 } 372 373 void ipoib_flush_paths(struct net_device *dev) 374 { 375 struct ipoib_dev_priv *priv = netdev_priv(dev); 376 struct ipoib_path *path, *tp; 377 LIST_HEAD(remove_list); 378 unsigned long flags; 379 380 netif_tx_lock_bh(dev); 381 spin_lock_irqsave(&priv->lock, flags); 382 383 list_splice_init(&priv->path_list, &remove_list); 384 385 list_for_each_entry(path, &remove_list, list) 386 rb_erase(&path->rb_node, &priv->path_tree); 387 388 list_for_each_entry_safe(path, tp, &remove_list, list) { 389 if (path->query) 390 ib_sa_cancel_query(path->query_id, path->query); 391 spin_unlock_irqrestore(&priv->lock, flags); 392 netif_tx_unlock_bh(dev); 393 wait_for_completion(&path->done); 394 path_free(dev, path); 395 netif_tx_lock_bh(dev); 396 spin_lock_irqsave(&priv->lock, flags); 397 } 398 399 spin_unlock_irqrestore(&priv->lock, flags); 400 netif_tx_unlock_bh(dev); 401 } 402 403 static void path_rec_completion(int status, 404 struct ib_sa_path_rec *pathrec, 405 void *path_ptr) 406 { 407 struct ipoib_path *path = path_ptr; 408 struct net_device *dev = path->dev; 409 struct ipoib_dev_priv *priv = netdev_priv(dev); 410 struct ipoib_ah *ah = NULL; 411 struct ipoib_ah *old_ah = NULL; 412 struct ipoib_neigh *neigh, *tn; 413 struct sk_buff_head skqueue; 414 struct sk_buff *skb; 415 unsigned long flags; 416 417 if (!status) 418 ipoib_dbg(priv, "PathRec LID 0x%04x for GID %pI6\n", 419 be16_to_cpu(pathrec->dlid), pathrec->dgid.raw); 420 else 421 ipoib_dbg(priv, "PathRec status %d for GID %pI6\n", 422 status, path->pathrec.dgid.raw); 423 424 skb_queue_head_init(&skqueue); 425 426 if (!status) { 427 struct ib_ah_attr av; 428 429 if (!ib_init_ah_from_path(priv->ca, priv->port, pathrec, &av)) 430 ah = ipoib_create_ah(dev, priv->pd, &av); 431 } 432 433 spin_lock_irqsave(&priv->lock, flags); 434 435 if (!IS_ERR_OR_NULL(ah)) { 436 path->pathrec = *pathrec; 437 438 old_ah = path->ah; 439 path->ah = ah; 440 441 ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n", 442 ah, be16_to_cpu(pathrec->dlid), pathrec->sl); 443 444 while ((skb = __skb_dequeue(&path->queue))) 445 __skb_queue_tail(&skqueue, skb); 446 447 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) { 448 if (neigh->ah) { 449 WARN_ON(neigh->ah != old_ah); 450 /* 451 * Dropping the ah reference inside 452 * priv->lock is safe here, because we 453 * will hold one more reference from 454 * the original value of path->ah (ie 455 * old_ah). 456 */ 457 ipoib_put_ah(neigh->ah); 458 } 459 kref_get(&path->ah->ref); 460 neigh->ah = path->ah; 461 memcpy(&neigh->dgid.raw, &path->pathrec.dgid.raw, 462 sizeof(union ib_gid)); 463 464 if (ipoib_cm_enabled(dev, neigh->neighbour)) { 465 if (!ipoib_cm_get(neigh)) 466 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, 467 path, 468 neigh)); 469 if (!ipoib_cm_get(neigh)) { 470 list_del(&neigh->list); 471 if (neigh->ah) 472 ipoib_put_ah(neigh->ah); 473 ipoib_neigh_free(dev, neigh); 474 continue; 475 } 476 } 477 478 while ((skb = __skb_dequeue(&neigh->queue))) 479 __skb_queue_tail(&skqueue, skb); 480 } 481 path->valid = 1; 482 } 483 484 path->query = NULL; 485 complete(&path->done); 486 487 spin_unlock_irqrestore(&priv->lock, flags); 488 489 if (old_ah) 490 ipoib_put_ah(old_ah); 491 492 while ((skb = __skb_dequeue(&skqueue))) { 493 skb->dev = dev; 494 if (dev_queue_xmit(skb)) 495 ipoib_warn(priv, "dev_queue_xmit failed " 496 "to requeue packet\n"); 497 } 498 } 499 500 static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid) 501 { 502 struct ipoib_dev_priv *priv = netdev_priv(dev); 503 struct ipoib_path *path; 504 505 if (!priv->broadcast) 506 return NULL; 507 508 path = kzalloc(sizeof *path, GFP_ATOMIC); 509 if (!path) 510 return NULL; 511 512 path->dev = dev; 513 514 skb_queue_head_init(&path->queue); 515 516 INIT_LIST_HEAD(&path->neigh_list); 517 518 memcpy(path->pathrec.dgid.raw, gid, sizeof (union ib_gid)); 519 path->pathrec.sgid = priv->local_gid; 520 path->pathrec.pkey = cpu_to_be16(priv->pkey); 521 path->pathrec.numb_path = 1; 522 path->pathrec.traffic_class = priv->broadcast->mcmember.traffic_class; 523 524 return path; 525 } 526 527 static int path_rec_start(struct net_device *dev, 528 struct ipoib_path *path) 529 { 530 struct ipoib_dev_priv *priv = netdev_priv(dev); 531 532 ipoib_dbg(priv, "Start path record lookup for %pI6\n", 533 path->pathrec.dgid.raw); 534 535 init_completion(&path->done); 536 537 path->query_id = 538 ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port, 539 &path->pathrec, 540 IB_SA_PATH_REC_DGID | 541 IB_SA_PATH_REC_SGID | 542 IB_SA_PATH_REC_NUMB_PATH | 543 IB_SA_PATH_REC_TRAFFIC_CLASS | 544 IB_SA_PATH_REC_PKEY, 545 1000, GFP_ATOMIC, 546 path_rec_completion, 547 path, &path->query); 548 if (path->query_id < 0) { 549 ipoib_warn(priv, "ib_sa_path_rec_get failed: %d\n", path->query_id); 550 path->query = NULL; 551 complete(&path->done); 552 return path->query_id; 553 } 554 555 return 0; 556 } 557 558 /* called with rcu_read_lock */ 559 static void neigh_add_path(struct sk_buff *skb, struct neighbour *n, struct net_device *dev) 560 { 561 struct ipoib_dev_priv *priv = netdev_priv(dev); 562 struct ipoib_path *path; 563 struct ipoib_neigh *neigh; 564 unsigned long flags; 565 566 neigh = ipoib_neigh_alloc(n, skb->dev); 567 if (!neigh) { 568 ++dev->stats.tx_dropped; 569 dev_kfree_skb_any(skb); 570 return; 571 } 572 573 spin_lock_irqsave(&priv->lock, flags); 574 575 path = __path_find(dev, n->ha + 4); 576 if (!path) { 577 path = path_rec_create(dev, n->ha + 4); 578 if (!path) 579 goto err_path; 580 581 __path_add(dev, path); 582 } 583 584 list_add_tail(&neigh->list, &path->neigh_list); 585 586 if (path->ah) { 587 kref_get(&path->ah->ref); 588 neigh->ah = path->ah; 589 memcpy(&neigh->dgid.raw, &path->pathrec.dgid.raw, 590 sizeof(union ib_gid)); 591 592 if (ipoib_cm_enabled(dev, neigh->neighbour)) { 593 if (!ipoib_cm_get(neigh)) 594 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, path, neigh)); 595 if (!ipoib_cm_get(neigh)) { 596 list_del(&neigh->list); 597 if (neigh->ah) 598 ipoib_put_ah(neigh->ah); 599 ipoib_neigh_free(dev, neigh); 600 goto err_drop; 601 } 602 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) 603 __skb_queue_tail(&neigh->queue, skb); 604 else { 605 ipoib_warn(priv, "queue length limit %d. Packet drop.\n", 606 skb_queue_len(&neigh->queue)); 607 goto err_drop; 608 } 609 } else { 610 spin_unlock_irqrestore(&priv->lock, flags); 611 ipoib_send(dev, skb, path->ah, IPOIB_QPN(n->ha)); 612 return; 613 } 614 } else { 615 neigh->ah = NULL; 616 617 if (!path->query && path_rec_start(dev, path)) 618 goto err_list; 619 620 __skb_queue_tail(&neigh->queue, skb); 621 } 622 623 spin_unlock_irqrestore(&priv->lock, flags); 624 return; 625 626 err_list: 627 list_del(&neigh->list); 628 629 err_path: 630 ipoib_neigh_free(dev, neigh); 631 err_drop: 632 ++dev->stats.tx_dropped; 633 dev_kfree_skb_any(skb); 634 635 spin_unlock_irqrestore(&priv->lock, flags); 636 } 637 638 /* called with rcu_read_lock */ 639 static void ipoib_path_lookup(struct sk_buff *skb, struct neighbour *n, struct net_device *dev) 640 { 641 struct ipoib_dev_priv *priv = netdev_priv(skb->dev); 642 643 /* Look up path record for unicasts */ 644 if (n->ha[4] != 0xff) { 645 neigh_add_path(skb, n, dev); 646 return; 647 } 648 649 /* Add in the P_Key for multicasts */ 650 n->ha[8] = (priv->pkey >> 8) & 0xff; 651 n->ha[9] = priv->pkey & 0xff; 652 ipoib_mcast_send(dev, n->ha + 4, skb); 653 } 654 655 static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev, 656 struct ipoib_cb *cb) 657 { 658 struct ipoib_dev_priv *priv = netdev_priv(dev); 659 struct ipoib_path *path; 660 unsigned long flags; 661 662 spin_lock_irqsave(&priv->lock, flags); 663 664 path = __path_find(dev, cb->hwaddr + 4); 665 if (!path || !path->valid) { 666 int new_path = 0; 667 668 if (!path) { 669 path = path_rec_create(dev, cb->hwaddr + 4); 670 new_path = 1; 671 } 672 if (path) { 673 __skb_queue_tail(&path->queue, skb); 674 675 if (!path->query && path_rec_start(dev, path)) { 676 spin_unlock_irqrestore(&priv->lock, flags); 677 if (new_path) 678 path_free(dev, path); 679 return; 680 } else 681 __path_add(dev, path); 682 } else { 683 ++dev->stats.tx_dropped; 684 dev_kfree_skb_any(skb); 685 } 686 687 spin_unlock_irqrestore(&priv->lock, flags); 688 return; 689 } 690 691 if (path->ah) { 692 ipoib_dbg(priv, "Send unicast ARP to %04x\n", 693 be16_to_cpu(path->pathrec.dlid)); 694 695 spin_unlock_irqrestore(&priv->lock, flags); 696 ipoib_send(dev, skb, path->ah, IPOIB_QPN(cb->hwaddr)); 697 return; 698 } else if ((path->query || !path_rec_start(dev, path)) && 699 skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) { 700 __skb_queue_tail(&path->queue, skb); 701 } else { 702 ++dev->stats.tx_dropped; 703 dev_kfree_skb_any(skb); 704 } 705 706 spin_unlock_irqrestore(&priv->lock, flags); 707 } 708 709 static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev) 710 { 711 struct ipoib_dev_priv *priv = netdev_priv(dev); 712 struct ipoib_neigh *neigh; 713 struct neighbour *n = NULL; 714 unsigned long flags; 715 716 rcu_read_lock(); 717 if (likely(skb_dst(skb))) { 718 n = dst_get_neighbour_noref(skb_dst(skb)); 719 if (!n) { 720 ++dev->stats.tx_dropped; 721 dev_kfree_skb_any(skb); 722 goto unlock; 723 } 724 } 725 if (likely(n)) { 726 if (unlikely(!*to_ipoib_neigh(n))) { 727 ipoib_path_lookup(skb, n, dev); 728 goto unlock; 729 } 730 731 neigh = *to_ipoib_neigh(n); 732 733 if (unlikely((memcmp(&neigh->dgid.raw, 734 n->ha + 4, 735 sizeof(union ib_gid))) || 736 (neigh->dev != dev))) { 737 spin_lock_irqsave(&priv->lock, flags); 738 /* 739 * It's safe to call ipoib_put_ah() inside 740 * priv->lock here, because we know that 741 * path->ah will always hold one more reference, 742 * so ipoib_put_ah() will never do more than 743 * decrement the ref count. 744 */ 745 if (neigh->ah) 746 ipoib_put_ah(neigh->ah); 747 list_del(&neigh->list); 748 ipoib_neigh_free(dev, neigh); 749 spin_unlock_irqrestore(&priv->lock, flags); 750 ipoib_path_lookup(skb, n, dev); 751 goto unlock; 752 } 753 754 if (ipoib_cm_get(neigh)) { 755 if (ipoib_cm_up(neigh)) { 756 ipoib_cm_send(dev, skb, ipoib_cm_get(neigh)); 757 goto unlock; 758 } 759 } else if (neigh->ah) { 760 ipoib_send(dev, skb, neigh->ah, IPOIB_QPN(n->ha)); 761 goto unlock; 762 } 763 764 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) { 765 spin_lock_irqsave(&priv->lock, flags); 766 __skb_queue_tail(&neigh->queue, skb); 767 spin_unlock_irqrestore(&priv->lock, flags); 768 } else { 769 ++dev->stats.tx_dropped; 770 dev_kfree_skb_any(skb); 771 } 772 } else { 773 struct ipoib_cb *cb = (struct ipoib_cb *) skb->cb; 774 775 if (cb->hwaddr[4] == 0xff) { 776 /* Add in the P_Key for multicast*/ 777 cb->hwaddr[8] = (priv->pkey >> 8) & 0xff; 778 cb->hwaddr[9] = priv->pkey & 0xff; 779 780 ipoib_mcast_send(dev, cb->hwaddr + 4, skb); 781 } else { 782 /* unicast GID -- should be ARP or RARP reply */ 783 784 if ((be16_to_cpup((__be16 *) skb->data) != ETH_P_ARP) && 785 (be16_to_cpup((__be16 *) skb->data) != ETH_P_RARP)) { 786 ipoib_warn(priv, "Unicast, no %s: type %04x, QPN %06x %pI6\n", 787 skb_dst(skb) ? "neigh" : "dst", 788 be16_to_cpup((__be16 *) skb->data), 789 IPOIB_QPN(cb->hwaddr), 790 cb->hwaddr + 4); 791 dev_kfree_skb_any(skb); 792 ++dev->stats.tx_dropped; 793 goto unlock; 794 } 795 796 unicast_arp_send(skb, dev, cb); 797 } 798 } 799 unlock: 800 rcu_read_unlock(); 801 return NETDEV_TX_OK; 802 } 803 804 static void ipoib_timeout(struct net_device *dev) 805 { 806 struct ipoib_dev_priv *priv = netdev_priv(dev); 807 808 ipoib_warn(priv, "transmit timeout: latency %d msecs\n", 809 jiffies_to_msecs(jiffies - dev->trans_start)); 810 ipoib_warn(priv, "queue stopped %d, tx_head %u, tx_tail %u\n", 811 netif_queue_stopped(dev), 812 priv->tx_head, priv->tx_tail); 813 /* XXX reset QP, etc. */ 814 } 815 816 static int ipoib_hard_header(struct sk_buff *skb, 817 struct net_device *dev, 818 unsigned short type, 819 const void *daddr, const void *saddr, unsigned len) 820 { 821 struct ipoib_header *header; 822 823 header = (struct ipoib_header *) skb_push(skb, sizeof *header); 824 825 header->proto = htons(type); 826 header->reserved = 0; 827 828 /* 829 * If we don't have a dst_entry structure, stuff the 830 * destination address into skb->cb so we can figure out where 831 * to send the packet later. 832 */ 833 if (!skb_dst(skb)) { 834 struct ipoib_cb *cb = (struct ipoib_cb *) skb->cb; 835 memcpy(cb->hwaddr, daddr, INFINIBAND_ALEN); 836 } 837 838 return 0; 839 } 840 841 static void ipoib_set_mcast_list(struct net_device *dev) 842 { 843 struct ipoib_dev_priv *priv = netdev_priv(dev); 844 845 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) { 846 ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set"); 847 return; 848 } 849 850 queue_work(ipoib_workqueue, &priv->restart_task); 851 } 852 853 static void ipoib_neigh_cleanup(struct neighbour *n) 854 { 855 struct ipoib_neigh *neigh; 856 struct ipoib_dev_priv *priv = netdev_priv(n->dev); 857 unsigned long flags; 858 struct ipoib_ah *ah = NULL; 859 860 neigh = *to_ipoib_neigh(n); 861 if (neigh) 862 priv = netdev_priv(neigh->dev); 863 else 864 return; 865 ipoib_dbg(priv, 866 "neigh_cleanup for %06x %pI6\n", 867 IPOIB_QPN(n->ha), 868 n->ha + 4); 869 870 spin_lock_irqsave(&priv->lock, flags); 871 872 if (neigh->ah) 873 ah = neigh->ah; 874 list_del(&neigh->list); 875 ipoib_neigh_free(n->dev, neigh); 876 877 spin_unlock_irqrestore(&priv->lock, flags); 878 879 if (ah) 880 ipoib_put_ah(ah); 881 } 882 883 struct ipoib_neigh *ipoib_neigh_alloc(struct neighbour *neighbour, 884 struct net_device *dev) 885 { 886 struct ipoib_neigh *neigh; 887 888 neigh = kmalloc(sizeof *neigh, GFP_ATOMIC); 889 if (!neigh) 890 return NULL; 891 892 neigh->neighbour = neighbour; 893 neigh->dev = dev; 894 memset(&neigh->dgid.raw, 0, sizeof (union ib_gid)); 895 *to_ipoib_neigh(neighbour) = neigh; 896 skb_queue_head_init(&neigh->queue); 897 ipoib_cm_set(neigh, NULL); 898 899 return neigh; 900 } 901 902 void ipoib_neigh_free(struct net_device *dev, struct ipoib_neigh *neigh) 903 { 904 struct sk_buff *skb; 905 *to_ipoib_neigh(neigh->neighbour) = NULL; 906 while ((skb = __skb_dequeue(&neigh->queue))) { 907 ++dev->stats.tx_dropped; 908 dev_kfree_skb_any(skb); 909 } 910 if (ipoib_cm_get(neigh)) 911 ipoib_cm_destroy_tx(ipoib_cm_get(neigh)); 912 kfree(neigh); 913 } 914 915 static int ipoib_neigh_setup_dev(struct net_device *dev, struct neigh_parms *parms) 916 { 917 parms->neigh_cleanup = ipoib_neigh_cleanup; 918 919 return 0; 920 } 921 922 int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port) 923 { 924 struct ipoib_dev_priv *priv = netdev_priv(dev); 925 926 /* Allocate RX/TX "rings" to hold queued skbs */ 927 priv->rx_ring = kzalloc(ipoib_recvq_size * sizeof *priv->rx_ring, 928 GFP_KERNEL); 929 if (!priv->rx_ring) { 930 printk(KERN_WARNING "%s: failed to allocate RX ring (%d entries)\n", 931 ca->name, ipoib_recvq_size); 932 goto out; 933 } 934 935 priv->tx_ring = vzalloc(ipoib_sendq_size * sizeof *priv->tx_ring); 936 if (!priv->tx_ring) { 937 printk(KERN_WARNING "%s: failed to allocate TX ring (%d entries)\n", 938 ca->name, ipoib_sendq_size); 939 goto out_rx_ring_cleanup; 940 } 941 942 /* priv->tx_head, tx_tail & tx_outstanding are already 0 */ 943 944 if (ipoib_ib_dev_init(dev, ca, port)) 945 goto out_tx_ring_cleanup; 946 947 return 0; 948 949 out_tx_ring_cleanup: 950 vfree(priv->tx_ring); 951 952 out_rx_ring_cleanup: 953 kfree(priv->rx_ring); 954 955 out: 956 return -ENOMEM; 957 } 958 959 void ipoib_dev_cleanup(struct net_device *dev) 960 { 961 struct ipoib_dev_priv *priv = netdev_priv(dev), *cpriv, *tcpriv; 962 963 ipoib_delete_debug_files(dev); 964 965 /* Delete any child interfaces first */ 966 list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) { 967 unregister_netdev(cpriv->dev); 968 ipoib_dev_cleanup(cpriv->dev); 969 free_netdev(cpriv->dev); 970 } 971 972 ipoib_ib_dev_cleanup(dev); 973 974 kfree(priv->rx_ring); 975 vfree(priv->tx_ring); 976 977 priv->rx_ring = NULL; 978 priv->tx_ring = NULL; 979 } 980 981 static const struct header_ops ipoib_header_ops = { 982 .create = ipoib_hard_header, 983 }; 984 985 static const struct net_device_ops ipoib_netdev_ops = { 986 .ndo_open = ipoib_open, 987 .ndo_stop = ipoib_stop, 988 .ndo_change_mtu = ipoib_change_mtu, 989 .ndo_fix_features = ipoib_fix_features, 990 .ndo_start_xmit = ipoib_start_xmit, 991 .ndo_tx_timeout = ipoib_timeout, 992 .ndo_set_rx_mode = ipoib_set_mcast_list, 993 .ndo_neigh_setup = ipoib_neigh_setup_dev, 994 }; 995 996 static void ipoib_setup(struct net_device *dev) 997 { 998 struct ipoib_dev_priv *priv = netdev_priv(dev); 999 1000 dev->netdev_ops = &ipoib_netdev_ops; 1001 dev->header_ops = &ipoib_header_ops; 1002 1003 ipoib_set_ethtool_ops(dev); 1004 1005 netif_napi_add(dev, &priv->napi, ipoib_poll, 100); 1006 1007 dev->watchdog_timeo = HZ; 1008 1009 dev->flags |= IFF_BROADCAST | IFF_MULTICAST; 1010 1011 dev->hard_header_len = IPOIB_ENCAP_LEN; 1012 dev->addr_len = INFINIBAND_ALEN; 1013 dev->type = ARPHRD_INFINIBAND; 1014 dev->tx_queue_len = ipoib_sendq_size * 2; 1015 dev->features = (NETIF_F_VLAN_CHALLENGED | 1016 NETIF_F_HIGHDMA); 1017 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; 1018 1019 memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN); 1020 1021 netif_carrier_off(dev); 1022 1023 priv->dev = dev; 1024 1025 spin_lock_init(&priv->lock); 1026 1027 mutex_init(&priv->vlan_mutex); 1028 1029 INIT_LIST_HEAD(&priv->path_list); 1030 INIT_LIST_HEAD(&priv->child_intfs); 1031 INIT_LIST_HEAD(&priv->dead_ahs); 1032 INIT_LIST_HEAD(&priv->multicast_list); 1033 1034 INIT_DELAYED_WORK(&priv->pkey_poll_task, ipoib_pkey_poll); 1035 INIT_DELAYED_WORK(&priv->mcast_task, ipoib_mcast_join_task); 1036 INIT_WORK(&priv->carrier_on_task, ipoib_mcast_carrier_on_task); 1037 INIT_WORK(&priv->flush_light, ipoib_ib_dev_flush_light); 1038 INIT_WORK(&priv->flush_normal, ipoib_ib_dev_flush_normal); 1039 INIT_WORK(&priv->flush_heavy, ipoib_ib_dev_flush_heavy); 1040 INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task); 1041 INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah); 1042 } 1043 1044 struct ipoib_dev_priv *ipoib_intf_alloc(const char *name) 1045 { 1046 struct net_device *dev; 1047 1048 dev = alloc_netdev((int) sizeof (struct ipoib_dev_priv), name, 1049 ipoib_setup); 1050 if (!dev) 1051 return NULL; 1052 1053 return netdev_priv(dev); 1054 } 1055 1056 static ssize_t show_pkey(struct device *dev, 1057 struct device_attribute *attr, char *buf) 1058 { 1059 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev)); 1060 1061 return sprintf(buf, "0x%04x\n", priv->pkey); 1062 } 1063 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL); 1064 1065 static ssize_t show_umcast(struct device *dev, 1066 struct device_attribute *attr, char *buf) 1067 { 1068 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev)); 1069 1070 return sprintf(buf, "%d\n", test_bit(IPOIB_FLAG_UMCAST, &priv->flags)); 1071 } 1072 1073 static ssize_t set_umcast(struct device *dev, 1074 struct device_attribute *attr, 1075 const char *buf, size_t count) 1076 { 1077 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev)); 1078 unsigned long umcast_val = simple_strtoul(buf, NULL, 0); 1079 1080 if (umcast_val > 0) { 1081 set_bit(IPOIB_FLAG_UMCAST, &priv->flags); 1082 ipoib_warn(priv, "ignoring multicast groups joined directly " 1083 "by userspace\n"); 1084 } else 1085 clear_bit(IPOIB_FLAG_UMCAST, &priv->flags); 1086 1087 return count; 1088 } 1089 static DEVICE_ATTR(umcast, S_IWUSR | S_IRUGO, show_umcast, set_umcast); 1090 1091 int ipoib_add_umcast_attr(struct net_device *dev) 1092 { 1093 return device_create_file(&dev->dev, &dev_attr_umcast); 1094 } 1095 1096 static ssize_t create_child(struct device *dev, 1097 struct device_attribute *attr, 1098 const char *buf, size_t count) 1099 { 1100 int pkey; 1101 int ret; 1102 1103 if (sscanf(buf, "%i", &pkey) != 1) 1104 return -EINVAL; 1105 1106 if (pkey < 0 || pkey > 0xffff) 1107 return -EINVAL; 1108 1109 /* 1110 * Set the full membership bit, so that we join the right 1111 * broadcast group, etc. 1112 */ 1113 pkey |= 0x8000; 1114 1115 ret = ipoib_vlan_add(to_net_dev(dev), pkey); 1116 1117 return ret ? ret : count; 1118 } 1119 static DEVICE_ATTR(create_child, S_IWUSR, NULL, create_child); 1120 1121 static ssize_t delete_child(struct device *dev, 1122 struct device_attribute *attr, 1123 const char *buf, size_t count) 1124 { 1125 int pkey; 1126 int ret; 1127 1128 if (sscanf(buf, "%i", &pkey) != 1) 1129 return -EINVAL; 1130 1131 if (pkey < 0 || pkey > 0xffff) 1132 return -EINVAL; 1133 1134 ret = ipoib_vlan_delete(to_net_dev(dev), pkey); 1135 1136 return ret ? ret : count; 1137 1138 } 1139 static DEVICE_ATTR(delete_child, S_IWUSR, NULL, delete_child); 1140 1141 int ipoib_add_pkey_attr(struct net_device *dev) 1142 { 1143 return device_create_file(&dev->dev, &dev_attr_pkey); 1144 } 1145 1146 int ipoib_set_dev_features(struct ipoib_dev_priv *priv, struct ib_device *hca) 1147 { 1148 struct ib_device_attr *device_attr; 1149 int result = -ENOMEM; 1150 1151 device_attr = kmalloc(sizeof *device_attr, GFP_KERNEL); 1152 if (!device_attr) { 1153 printk(KERN_WARNING "%s: allocation of %zu bytes failed\n", 1154 hca->name, sizeof *device_attr); 1155 return result; 1156 } 1157 1158 result = ib_query_device(hca, device_attr); 1159 if (result) { 1160 printk(KERN_WARNING "%s: ib_query_device failed (ret = %d)\n", 1161 hca->name, result); 1162 kfree(device_attr); 1163 return result; 1164 } 1165 priv->hca_caps = device_attr->device_cap_flags; 1166 1167 kfree(device_attr); 1168 1169 if (priv->hca_caps & IB_DEVICE_UD_IP_CSUM) { 1170 priv->dev->hw_features = NETIF_F_SG | 1171 NETIF_F_IP_CSUM | NETIF_F_RXCSUM; 1172 1173 if (priv->hca_caps & IB_DEVICE_UD_TSO) 1174 priv->dev->hw_features |= NETIF_F_TSO; 1175 1176 priv->dev->features |= priv->dev->hw_features; 1177 } 1178 1179 return 0; 1180 } 1181 1182 static struct net_device *ipoib_add_port(const char *format, 1183 struct ib_device *hca, u8 port) 1184 { 1185 struct ipoib_dev_priv *priv; 1186 struct ib_port_attr attr; 1187 int result = -ENOMEM; 1188 1189 priv = ipoib_intf_alloc(format); 1190 if (!priv) 1191 goto alloc_mem_failed; 1192 1193 SET_NETDEV_DEV(priv->dev, hca->dma_device); 1194 priv->dev->dev_id = port - 1; 1195 1196 if (!ib_query_port(hca, port, &attr)) 1197 priv->max_ib_mtu = ib_mtu_enum_to_int(attr.max_mtu); 1198 else { 1199 printk(KERN_WARNING "%s: ib_query_port %d failed\n", 1200 hca->name, port); 1201 goto device_init_failed; 1202 } 1203 1204 /* MTU will be reset when mcast join happens */ 1205 priv->dev->mtu = IPOIB_UD_MTU(priv->max_ib_mtu); 1206 priv->mcast_mtu = priv->admin_mtu = priv->dev->mtu; 1207 1208 priv->dev->neigh_priv_len = sizeof(struct ipoib_neigh); 1209 1210 result = ib_query_pkey(hca, port, 0, &priv->pkey); 1211 if (result) { 1212 printk(KERN_WARNING "%s: ib_query_pkey port %d failed (ret = %d)\n", 1213 hca->name, port, result); 1214 goto device_init_failed; 1215 } 1216 1217 if (ipoib_set_dev_features(priv, hca)) 1218 goto device_init_failed; 1219 1220 /* 1221 * Set the full membership bit, so that we join the right 1222 * broadcast group, etc. 1223 */ 1224 priv->pkey |= 0x8000; 1225 1226 priv->dev->broadcast[8] = priv->pkey >> 8; 1227 priv->dev->broadcast[9] = priv->pkey & 0xff; 1228 1229 result = ib_query_gid(hca, port, 0, &priv->local_gid); 1230 if (result) { 1231 printk(KERN_WARNING "%s: ib_query_gid port %d failed (ret = %d)\n", 1232 hca->name, port, result); 1233 goto device_init_failed; 1234 } else 1235 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid)); 1236 1237 result = ipoib_dev_init(priv->dev, hca, port); 1238 if (result < 0) { 1239 printk(KERN_WARNING "%s: failed to initialize port %d (ret = %d)\n", 1240 hca->name, port, result); 1241 goto device_init_failed; 1242 } 1243 1244 INIT_IB_EVENT_HANDLER(&priv->event_handler, 1245 priv->ca, ipoib_event); 1246 result = ib_register_event_handler(&priv->event_handler); 1247 if (result < 0) { 1248 printk(KERN_WARNING "%s: ib_register_event_handler failed for " 1249 "port %d (ret = %d)\n", 1250 hca->name, port, result); 1251 goto event_failed; 1252 } 1253 1254 result = register_netdev(priv->dev); 1255 if (result) { 1256 printk(KERN_WARNING "%s: couldn't register ipoib port %d; error %d\n", 1257 hca->name, port, result); 1258 goto register_failed; 1259 } 1260 1261 ipoib_create_debug_files(priv->dev); 1262 1263 if (ipoib_cm_add_mode_attr(priv->dev)) 1264 goto sysfs_failed; 1265 if (ipoib_add_pkey_attr(priv->dev)) 1266 goto sysfs_failed; 1267 if (ipoib_add_umcast_attr(priv->dev)) 1268 goto sysfs_failed; 1269 if (device_create_file(&priv->dev->dev, &dev_attr_create_child)) 1270 goto sysfs_failed; 1271 if (device_create_file(&priv->dev->dev, &dev_attr_delete_child)) 1272 goto sysfs_failed; 1273 1274 return priv->dev; 1275 1276 sysfs_failed: 1277 ipoib_delete_debug_files(priv->dev); 1278 unregister_netdev(priv->dev); 1279 1280 register_failed: 1281 ib_unregister_event_handler(&priv->event_handler); 1282 flush_workqueue(ipoib_workqueue); 1283 1284 event_failed: 1285 ipoib_dev_cleanup(priv->dev); 1286 1287 device_init_failed: 1288 free_netdev(priv->dev); 1289 1290 alloc_mem_failed: 1291 return ERR_PTR(result); 1292 } 1293 1294 static void ipoib_add_one(struct ib_device *device) 1295 { 1296 struct list_head *dev_list; 1297 struct net_device *dev; 1298 struct ipoib_dev_priv *priv; 1299 int s, e, p; 1300 1301 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB) 1302 return; 1303 1304 dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL); 1305 if (!dev_list) 1306 return; 1307 1308 INIT_LIST_HEAD(dev_list); 1309 1310 if (device->node_type == RDMA_NODE_IB_SWITCH) { 1311 s = 0; 1312 e = 0; 1313 } else { 1314 s = 1; 1315 e = device->phys_port_cnt; 1316 } 1317 1318 for (p = s; p <= e; ++p) { 1319 if (rdma_port_get_link_layer(device, p) != IB_LINK_LAYER_INFINIBAND) 1320 continue; 1321 dev = ipoib_add_port("ib%d", device, p); 1322 if (!IS_ERR(dev)) { 1323 priv = netdev_priv(dev); 1324 list_add_tail(&priv->list, dev_list); 1325 } 1326 } 1327 1328 ib_set_client_data(device, &ipoib_client, dev_list); 1329 } 1330 1331 static void ipoib_remove_one(struct ib_device *device) 1332 { 1333 struct ipoib_dev_priv *priv, *tmp; 1334 struct list_head *dev_list; 1335 1336 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB) 1337 return; 1338 1339 dev_list = ib_get_client_data(device, &ipoib_client); 1340 1341 list_for_each_entry_safe(priv, tmp, dev_list, list) { 1342 ib_unregister_event_handler(&priv->event_handler); 1343 1344 rtnl_lock(); 1345 dev_change_flags(priv->dev, priv->dev->flags & ~IFF_UP); 1346 rtnl_unlock(); 1347 1348 flush_workqueue(ipoib_workqueue); 1349 1350 unregister_netdev(priv->dev); 1351 ipoib_dev_cleanup(priv->dev); 1352 free_netdev(priv->dev); 1353 } 1354 1355 kfree(dev_list); 1356 } 1357 1358 static int __init ipoib_init_module(void) 1359 { 1360 int ret; 1361 1362 ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size); 1363 ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE); 1364 ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE); 1365 1366 ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size); 1367 ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE); 1368 ipoib_sendq_size = max3(ipoib_sendq_size, 2 * MAX_SEND_CQE, IPOIB_MIN_QUEUE_SIZE); 1369 #ifdef CONFIG_INFINIBAND_IPOIB_CM 1370 ipoib_max_conn_qp = min(ipoib_max_conn_qp, IPOIB_CM_MAX_CONN_QP); 1371 #endif 1372 1373 /* 1374 * When copying small received packets, we only copy from the 1375 * linear data part of the SKB, so we rely on this condition. 1376 */ 1377 BUILD_BUG_ON(IPOIB_CM_COPYBREAK > IPOIB_CM_HEAD_SIZE); 1378 1379 ret = ipoib_register_debugfs(); 1380 if (ret) 1381 return ret; 1382 1383 /* 1384 * We create our own workqueue mainly because we want to be 1385 * able to flush it when devices are being removed. We can't 1386 * use schedule_work()/flush_scheduled_work() because both 1387 * unregister_netdev() and linkwatch_event take the rtnl lock, 1388 * so flush_scheduled_work() can deadlock during device 1389 * removal. 1390 */ 1391 ipoib_workqueue = create_singlethread_workqueue("ipoib"); 1392 if (!ipoib_workqueue) { 1393 ret = -ENOMEM; 1394 goto err_fs; 1395 } 1396 1397 ib_sa_register_client(&ipoib_sa_client); 1398 1399 ret = ib_register_client(&ipoib_client); 1400 if (ret) 1401 goto err_sa; 1402 1403 return 0; 1404 1405 err_sa: 1406 ib_sa_unregister_client(&ipoib_sa_client); 1407 destroy_workqueue(ipoib_workqueue); 1408 1409 err_fs: 1410 ipoib_unregister_debugfs(); 1411 1412 return ret; 1413 } 1414 1415 static void __exit ipoib_cleanup_module(void) 1416 { 1417 ib_unregister_client(&ipoib_client); 1418 ib_sa_unregister_client(&ipoib_sa_client); 1419 ipoib_unregister_debugfs(); 1420 destroy_workqueue(ipoib_workqueue); 1421 } 1422 1423 module_init(ipoib_init_module); 1424 module_exit(ipoib_cleanup_module); 1425