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