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 * $Id: ipoib_main.c 1377 2004-12-23 19:57:12Z roland $ 35 */ 36 37 #include "ipoib.h" 38 39 #include <linux/module.h> 40 41 #include <linux/init.h> 42 #include <linux/slab.h> 43 #include <linux/kernel.h> 44 #include <linux/vmalloc.h> 45 46 #include <linux/if_arp.h> /* For ARPHRD_xxx */ 47 48 #include <linux/ip.h> 49 #include <linux/in.h> 50 51 #include <net/dst.h> 52 53 MODULE_AUTHOR("Roland Dreier"); 54 MODULE_DESCRIPTION("IP-over-InfiniBand net driver"); 55 MODULE_LICENSE("Dual BSD/GPL"); 56 57 int ipoib_sendq_size __read_mostly = IPOIB_TX_RING_SIZE; 58 int ipoib_recvq_size __read_mostly = IPOIB_RX_RING_SIZE; 59 60 module_param_named(send_queue_size, ipoib_sendq_size, int, 0444); 61 MODULE_PARM_DESC(send_queue_size, "Number of descriptors in send queue"); 62 module_param_named(recv_queue_size, ipoib_recvq_size, int, 0444); 63 MODULE_PARM_DESC(recv_queue_size, "Number of descriptors in receive queue"); 64 65 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG 66 int ipoib_debug_level; 67 68 module_param_named(debug_level, ipoib_debug_level, int, 0644); 69 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0"); 70 #endif 71 72 struct ipoib_path_iter { 73 struct net_device *dev; 74 struct ipoib_path path; 75 }; 76 77 static const u8 ipv4_bcast_addr[] = { 78 0x00, 0xff, 0xff, 0xff, 79 0xff, 0x12, 0x40, 0x1b, 0x00, 0x00, 0x00, 0x00, 80 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff 81 }; 82 83 struct workqueue_struct *ipoib_workqueue; 84 85 struct ib_sa_client ipoib_sa_client; 86 87 static void ipoib_add_one(struct ib_device *device); 88 static void ipoib_remove_one(struct ib_device *device); 89 90 static struct ib_client ipoib_client = { 91 .name = "ipoib", 92 .add = ipoib_add_one, 93 .remove = ipoib_remove_one 94 }; 95 96 int ipoib_open(struct net_device *dev) 97 { 98 struct ipoib_dev_priv *priv = netdev_priv(dev); 99 100 ipoib_dbg(priv, "bringing up interface\n"); 101 102 napi_enable(&priv->napi); 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 napi_disable(&priv->napi); 110 return -EINVAL; 111 } 112 113 if (ipoib_ib_dev_up(dev)) { 114 ipoib_ib_dev_stop(dev, 1); 115 napi_disable(&priv->napi); 116 return -EINVAL; 117 } 118 119 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) { 120 struct ipoib_dev_priv *cpriv; 121 122 /* Bring up any child interfaces too */ 123 mutex_lock(&priv->vlan_mutex); 124 list_for_each_entry(cpriv, &priv->child_intfs, list) { 125 int flags; 126 127 flags = cpriv->dev->flags; 128 if (flags & IFF_UP) 129 continue; 130 131 dev_change_flags(cpriv->dev, flags | IFF_UP); 132 } 133 mutex_unlock(&priv->vlan_mutex); 134 } 135 136 netif_start_queue(dev); 137 138 return 0; 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 napi_disable(&priv->napi); 149 150 netif_stop_queue(dev); 151 152 /* 153 * Now flush workqueue to make sure a scheduled task doesn't 154 * bring our internal state back up. 155 */ 156 flush_workqueue(ipoib_workqueue); 157 158 ipoib_ib_dev_down(dev, 1); 159 ipoib_ib_dev_stop(dev, 1); 160 161 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) { 162 struct ipoib_dev_priv *cpriv; 163 164 /* Bring down any child interfaces too */ 165 mutex_lock(&priv->vlan_mutex); 166 list_for_each_entry(cpriv, &priv->child_intfs, list) { 167 int flags; 168 169 flags = cpriv->dev->flags; 170 if (!(flags & IFF_UP)) 171 continue; 172 173 dev_change_flags(cpriv->dev, flags & ~IFF_UP); 174 } 175 mutex_unlock(&priv->vlan_mutex); 176 } 177 178 return 0; 179 } 180 181 static int ipoib_change_mtu(struct net_device *dev, int new_mtu) 182 { 183 struct ipoib_dev_priv *priv = netdev_priv(dev); 184 185 /* dev->mtu > 2K ==> connected mode */ 186 if (ipoib_cm_admin_enabled(dev)) { 187 if (new_mtu > ipoib_cm_max_mtu(dev)) 188 return -EINVAL; 189 190 if (new_mtu > priv->mcast_mtu) 191 ipoib_warn(priv, "mtu > %d will cause multicast packet drops.\n", 192 priv->mcast_mtu); 193 194 dev->mtu = new_mtu; 195 return 0; 196 } 197 198 if (new_mtu > IPOIB_UD_MTU(priv->max_ib_mtu)) 199 return -EINVAL; 200 201 priv->admin_mtu = new_mtu; 202 203 dev->mtu = min(priv->mcast_mtu, priv->admin_mtu); 204 205 return 0; 206 } 207 208 static struct ipoib_path *__path_find(struct net_device *dev, void *gid) 209 { 210 struct ipoib_dev_priv *priv = netdev_priv(dev); 211 struct rb_node *n = priv->path_tree.rb_node; 212 struct ipoib_path *path; 213 int ret; 214 215 while (n) { 216 path = rb_entry(n, struct ipoib_path, rb_node); 217 218 ret = memcmp(gid, path->pathrec.dgid.raw, 219 sizeof (union ib_gid)); 220 221 if (ret < 0) 222 n = n->rb_left; 223 else if (ret > 0) 224 n = n->rb_right; 225 else 226 return path; 227 } 228 229 return NULL; 230 } 231 232 static int __path_add(struct net_device *dev, struct ipoib_path *path) 233 { 234 struct ipoib_dev_priv *priv = netdev_priv(dev); 235 struct rb_node **n = &priv->path_tree.rb_node; 236 struct rb_node *pn = NULL; 237 struct ipoib_path *tpath; 238 int ret; 239 240 while (*n) { 241 pn = *n; 242 tpath = rb_entry(pn, struct ipoib_path, rb_node); 243 244 ret = memcmp(path->pathrec.dgid.raw, tpath->pathrec.dgid.raw, 245 sizeof (union ib_gid)); 246 if (ret < 0) 247 n = &pn->rb_left; 248 else if (ret > 0) 249 n = &pn->rb_right; 250 else 251 return -EEXIST; 252 } 253 254 rb_link_node(&path->rb_node, pn, n); 255 rb_insert_color(&path->rb_node, &priv->path_tree); 256 257 list_add_tail(&path->list, &priv->path_list); 258 259 return 0; 260 } 261 262 static void path_free(struct net_device *dev, struct ipoib_path *path) 263 { 264 struct ipoib_dev_priv *priv = netdev_priv(dev); 265 struct ipoib_neigh *neigh, *tn; 266 struct sk_buff *skb; 267 unsigned long flags; 268 269 while ((skb = __skb_dequeue(&path->queue))) 270 dev_kfree_skb_irq(skb); 271 272 spin_lock_irqsave(&priv->lock, flags); 273 274 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) { 275 /* 276 * It's safe to call ipoib_put_ah() inside priv->lock 277 * here, because we know that path->ah will always 278 * hold one more reference, so ipoib_put_ah() will 279 * never do more than decrement the ref count. 280 */ 281 if (neigh->ah) 282 ipoib_put_ah(neigh->ah); 283 284 ipoib_neigh_free(dev, neigh); 285 } 286 287 spin_unlock_irqrestore(&priv->lock, flags); 288 289 if (path->ah) 290 ipoib_put_ah(path->ah); 291 292 kfree(path); 293 } 294 295 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG 296 297 struct ipoib_path_iter *ipoib_path_iter_init(struct net_device *dev) 298 { 299 struct ipoib_path_iter *iter; 300 301 iter = kmalloc(sizeof *iter, GFP_KERNEL); 302 if (!iter) 303 return NULL; 304 305 iter->dev = dev; 306 memset(iter->path.pathrec.dgid.raw, 0, 16); 307 308 if (ipoib_path_iter_next(iter)) { 309 kfree(iter); 310 return NULL; 311 } 312 313 return iter; 314 } 315 316 int ipoib_path_iter_next(struct ipoib_path_iter *iter) 317 { 318 struct ipoib_dev_priv *priv = netdev_priv(iter->dev); 319 struct rb_node *n; 320 struct ipoib_path *path; 321 int ret = 1; 322 323 spin_lock_irq(&priv->lock); 324 325 n = rb_first(&priv->path_tree); 326 327 while (n) { 328 path = rb_entry(n, struct ipoib_path, rb_node); 329 330 if (memcmp(iter->path.pathrec.dgid.raw, path->pathrec.dgid.raw, 331 sizeof (union ib_gid)) < 0) { 332 iter->path = *path; 333 ret = 0; 334 break; 335 } 336 337 n = rb_next(n); 338 } 339 340 spin_unlock_irq(&priv->lock); 341 342 return ret; 343 } 344 345 void ipoib_path_iter_read(struct ipoib_path_iter *iter, 346 struct ipoib_path *path) 347 { 348 *path = iter->path; 349 } 350 351 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */ 352 353 void ipoib_flush_paths(struct net_device *dev) 354 { 355 struct ipoib_dev_priv *priv = netdev_priv(dev); 356 struct ipoib_path *path, *tp; 357 LIST_HEAD(remove_list); 358 359 spin_lock_irq(&priv->tx_lock); 360 spin_lock(&priv->lock); 361 362 list_splice_init(&priv->path_list, &remove_list); 363 364 list_for_each_entry(path, &remove_list, list) 365 rb_erase(&path->rb_node, &priv->path_tree); 366 367 list_for_each_entry_safe(path, tp, &remove_list, list) { 368 if (path->query) 369 ib_sa_cancel_query(path->query_id, path->query); 370 spin_unlock(&priv->lock); 371 spin_unlock_irq(&priv->tx_lock); 372 wait_for_completion(&path->done); 373 path_free(dev, path); 374 spin_lock_irq(&priv->tx_lock); 375 spin_lock(&priv->lock); 376 } 377 spin_unlock(&priv->lock); 378 spin_unlock_irq(&priv->tx_lock); 379 } 380 381 static void path_rec_completion(int status, 382 struct ib_sa_path_rec *pathrec, 383 void *path_ptr) 384 { 385 struct ipoib_path *path = path_ptr; 386 struct net_device *dev = path->dev; 387 struct ipoib_dev_priv *priv = netdev_priv(dev); 388 struct ipoib_ah *ah = NULL; 389 struct ipoib_neigh *neigh, *tn; 390 struct sk_buff_head skqueue; 391 struct sk_buff *skb; 392 unsigned long flags; 393 394 if (!status) 395 ipoib_dbg(priv, "PathRec LID 0x%04x for GID " IPOIB_GID_FMT "\n", 396 be16_to_cpu(pathrec->dlid), IPOIB_GID_ARG(pathrec->dgid)); 397 else 398 ipoib_dbg(priv, "PathRec status %d for GID " IPOIB_GID_FMT "\n", 399 status, IPOIB_GID_ARG(path->pathrec.dgid)); 400 401 skb_queue_head_init(&skqueue); 402 403 if (!status) { 404 struct ib_ah_attr av; 405 406 if (!ib_init_ah_from_path(priv->ca, priv->port, pathrec, &av)) 407 ah = ipoib_create_ah(dev, priv->pd, &av); 408 } 409 410 spin_lock_irqsave(&priv->lock, flags); 411 412 path->ah = ah; 413 414 if (ah) { 415 path->pathrec = *pathrec; 416 417 ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n", 418 ah, be16_to_cpu(pathrec->dlid), pathrec->sl); 419 420 while ((skb = __skb_dequeue(&path->queue))) 421 __skb_queue_tail(&skqueue, skb); 422 423 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) { 424 kref_get(&path->ah->ref); 425 neigh->ah = path->ah; 426 memcpy(&neigh->dgid.raw, &path->pathrec.dgid.raw, 427 sizeof(union ib_gid)); 428 429 if (ipoib_cm_enabled(dev, neigh->neighbour)) { 430 if (!ipoib_cm_get(neigh)) 431 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, 432 path, 433 neigh)); 434 if (!ipoib_cm_get(neigh)) { 435 list_del(&neigh->list); 436 if (neigh->ah) 437 ipoib_put_ah(neigh->ah); 438 ipoib_neigh_free(dev, neigh); 439 continue; 440 } 441 } 442 443 while ((skb = __skb_dequeue(&neigh->queue))) 444 __skb_queue_tail(&skqueue, skb); 445 } 446 } 447 448 path->query = NULL; 449 complete(&path->done); 450 451 spin_unlock_irqrestore(&priv->lock, flags); 452 453 while ((skb = __skb_dequeue(&skqueue))) { 454 skb->dev = dev; 455 if (dev_queue_xmit(skb)) 456 ipoib_warn(priv, "dev_queue_xmit failed " 457 "to requeue packet\n"); 458 } 459 } 460 461 static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid) 462 { 463 struct ipoib_dev_priv *priv = netdev_priv(dev); 464 struct ipoib_path *path; 465 466 if (!priv->broadcast) 467 return NULL; 468 469 path = kzalloc(sizeof *path, GFP_ATOMIC); 470 if (!path) 471 return NULL; 472 473 path->dev = dev; 474 475 skb_queue_head_init(&path->queue); 476 477 INIT_LIST_HEAD(&path->neigh_list); 478 479 memcpy(path->pathrec.dgid.raw, gid, sizeof (union ib_gid)); 480 path->pathrec.sgid = priv->local_gid; 481 path->pathrec.pkey = cpu_to_be16(priv->pkey); 482 path->pathrec.numb_path = 1; 483 path->pathrec.traffic_class = priv->broadcast->mcmember.traffic_class; 484 485 return path; 486 } 487 488 static int path_rec_start(struct net_device *dev, 489 struct ipoib_path *path) 490 { 491 struct ipoib_dev_priv *priv = netdev_priv(dev); 492 493 ipoib_dbg(priv, "Start path record lookup for " IPOIB_GID_FMT "\n", 494 IPOIB_GID_ARG(path->pathrec.dgid)); 495 496 init_completion(&path->done); 497 498 path->query_id = 499 ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port, 500 &path->pathrec, 501 IB_SA_PATH_REC_DGID | 502 IB_SA_PATH_REC_SGID | 503 IB_SA_PATH_REC_NUMB_PATH | 504 IB_SA_PATH_REC_TRAFFIC_CLASS | 505 IB_SA_PATH_REC_PKEY, 506 1000, GFP_ATOMIC, 507 path_rec_completion, 508 path, &path->query); 509 if (path->query_id < 0) { 510 ipoib_warn(priv, "ib_sa_path_rec_get failed\n"); 511 path->query = NULL; 512 return path->query_id; 513 } 514 515 return 0; 516 } 517 518 static void neigh_add_path(struct sk_buff *skb, struct net_device *dev) 519 { 520 struct ipoib_dev_priv *priv = netdev_priv(dev); 521 struct ipoib_path *path; 522 struct ipoib_neigh *neigh; 523 524 neigh = ipoib_neigh_alloc(skb->dst->neighbour, skb->dev); 525 if (!neigh) { 526 ++dev->stats.tx_dropped; 527 dev_kfree_skb_any(skb); 528 return; 529 } 530 531 /* 532 * We can only be called from ipoib_start_xmit, so we're 533 * inside tx_lock -- no need to save/restore flags. 534 */ 535 spin_lock(&priv->lock); 536 537 path = __path_find(dev, skb->dst->neighbour->ha + 4); 538 if (!path) { 539 path = path_rec_create(dev, skb->dst->neighbour->ha + 4); 540 if (!path) 541 goto err_path; 542 543 __path_add(dev, path); 544 } 545 546 list_add_tail(&neigh->list, &path->neigh_list); 547 548 if (path->ah) { 549 kref_get(&path->ah->ref); 550 neigh->ah = path->ah; 551 memcpy(&neigh->dgid.raw, &path->pathrec.dgid.raw, 552 sizeof(union ib_gid)); 553 554 if (ipoib_cm_enabled(dev, neigh->neighbour)) { 555 if (!ipoib_cm_get(neigh)) 556 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, path, neigh)); 557 if (!ipoib_cm_get(neigh)) { 558 list_del(&neigh->list); 559 if (neigh->ah) 560 ipoib_put_ah(neigh->ah); 561 ipoib_neigh_free(dev, neigh); 562 goto err_drop; 563 } 564 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) 565 __skb_queue_tail(&neigh->queue, skb); 566 else { 567 ipoib_warn(priv, "queue length limit %d. Packet drop.\n", 568 skb_queue_len(&neigh->queue)); 569 goto err_drop; 570 } 571 } else 572 ipoib_send(dev, skb, path->ah, IPOIB_QPN(skb->dst->neighbour->ha)); 573 } else { 574 neigh->ah = NULL; 575 576 if (!path->query && path_rec_start(dev, path)) 577 goto err_list; 578 579 __skb_queue_tail(&neigh->queue, skb); 580 } 581 582 spin_unlock(&priv->lock); 583 return; 584 585 err_list: 586 list_del(&neigh->list); 587 588 err_path: 589 ipoib_neigh_free(dev, neigh); 590 err_drop: 591 ++dev->stats.tx_dropped; 592 dev_kfree_skb_any(skb); 593 594 spin_unlock(&priv->lock); 595 } 596 597 static void ipoib_path_lookup(struct sk_buff *skb, struct net_device *dev) 598 { 599 struct ipoib_dev_priv *priv = netdev_priv(skb->dev); 600 601 /* Look up path record for unicasts */ 602 if (skb->dst->neighbour->ha[4] != 0xff) { 603 neigh_add_path(skb, dev); 604 return; 605 } 606 607 /* Add in the P_Key for multicasts */ 608 skb->dst->neighbour->ha[8] = (priv->pkey >> 8) & 0xff; 609 skb->dst->neighbour->ha[9] = priv->pkey & 0xff; 610 ipoib_mcast_send(dev, skb->dst->neighbour->ha + 4, skb); 611 } 612 613 static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev, 614 struct ipoib_pseudoheader *phdr) 615 { 616 struct ipoib_dev_priv *priv = netdev_priv(dev); 617 struct ipoib_path *path; 618 619 /* 620 * We can only be called from ipoib_start_xmit, so we're 621 * inside tx_lock -- no need to save/restore flags. 622 */ 623 spin_lock(&priv->lock); 624 625 path = __path_find(dev, phdr->hwaddr + 4); 626 if (!path) { 627 path = path_rec_create(dev, phdr->hwaddr + 4); 628 if (path) { 629 /* put pseudoheader back on for next time */ 630 skb_push(skb, sizeof *phdr); 631 __skb_queue_tail(&path->queue, skb); 632 633 if (path_rec_start(dev, path)) { 634 spin_unlock(&priv->lock); 635 path_free(dev, path); 636 return; 637 } else 638 __path_add(dev, path); 639 } else { 640 ++dev->stats.tx_dropped; 641 dev_kfree_skb_any(skb); 642 } 643 644 spin_unlock(&priv->lock); 645 return; 646 } 647 648 if (path->ah) { 649 ipoib_dbg(priv, "Send unicast ARP to %04x\n", 650 be16_to_cpu(path->pathrec.dlid)); 651 652 ipoib_send(dev, skb, path->ah, IPOIB_QPN(phdr->hwaddr)); 653 } else if ((path->query || !path_rec_start(dev, path)) && 654 skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) { 655 /* put pseudoheader back on for next time */ 656 skb_push(skb, sizeof *phdr); 657 __skb_queue_tail(&path->queue, skb); 658 } else { 659 ++dev->stats.tx_dropped; 660 dev_kfree_skb_any(skb); 661 } 662 663 spin_unlock(&priv->lock); 664 } 665 666 static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev) 667 { 668 struct ipoib_dev_priv *priv = netdev_priv(dev); 669 struct ipoib_neigh *neigh; 670 unsigned long flags; 671 672 if (unlikely(!spin_trylock_irqsave(&priv->tx_lock, flags))) 673 return NETDEV_TX_LOCKED; 674 675 if (likely(skb->dst && skb->dst->neighbour)) { 676 if (unlikely(!*to_ipoib_neigh(skb->dst->neighbour))) { 677 ipoib_path_lookup(skb, dev); 678 goto out; 679 } 680 681 neigh = *to_ipoib_neigh(skb->dst->neighbour); 682 683 if (neigh->ah) 684 if (unlikely((memcmp(&neigh->dgid.raw, 685 skb->dst->neighbour->ha + 4, 686 sizeof(union ib_gid))) || 687 (neigh->dev != dev))) { 688 spin_lock(&priv->lock); 689 /* 690 * It's safe to call ipoib_put_ah() inside 691 * priv->lock here, because we know that 692 * path->ah will always hold one more reference, 693 * so ipoib_put_ah() will never do more than 694 * decrement the ref count. 695 */ 696 ipoib_put_ah(neigh->ah); 697 list_del(&neigh->list); 698 ipoib_neigh_free(dev, neigh); 699 spin_unlock(&priv->lock); 700 ipoib_path_lookup(skb, dev); 701 goto out; 702 } 703 704 if (ipoib_cm_get(neigh)) { 705 if (ipoib_cm_up(neigh)) { 706 ipoib_cm_send(dev, skb, ipoib_cm_get(neigh)); 707 goto out; 708 } 709 } else if (neigh->ah) { 710 ipoib_send(dev, skb, neigh->ah, IPOIB_QPN(skb->dst->neighbour->ha)); 711 goto out; 712 } 713 714 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) { 715 spin_lock(&priv->lock); 716 __skb_queue_tail(&neigh->queue, skb); 717 spin_unlock(&priv->lock); 718 } else { 719 ++dev->stats.tx_dropped; 720 dev_kfree_skb_any(skb); 721 } 722 } else { 723 struct ipoib_pseudoheader *phdr = 724 (struct ipoib_pseudoheader *) skb->data; 725 skb_pull(skb, sizeof *phdr); 726 727 if (phdr->hwaddr[4] == 0xff) { 728 /* Add in the P_Key for multicast*/ 729 phdr->hwaddr[8] = (priv->pkey >> 8) & 0xff; 730 phdr->hwaddr[9] = priv->pkey & 0xff; 731 732 ipoib_mcast_send(dev, phdr->hwaddr + 4, skb); 733 } else { 734 /* unicast GID -- should be ARP or RARP reply */ 735 736 if ((be16_to_cpup((__be16 *) skb->data) != ETH_P_ARP) && 737 (be16_to_cpup((__be16 *) skb->data) != ETH_P_RARP)) { 738 ipoib_warn(priv, "Unicast, no %s: type %04x, QPN %06x " 739 IPOIB_GID_FMT "\n", 740 skb->dst ? "neigh" : "dst", 741 be16_to_cpup((__be16 *) skb->data), 742 IPOIB_QPN(phdr->hwaddr), 743 IPOIB_GID_RAW_ARG(phdr->hwaddr + 4)); 744 dev_kfree_skb_any(skb); 745 ++dev->stats.tx_dropped; 746 goto out; 747 } 748 749 unicast_arp_send(skb, dev, phdr); 750 } 751 } 752 753 out: 754 spin_unlock_irqrestore(&priv->tx_lock, flags); 755 756 return NETDEV_TX_OK; 757 } 758 759 static void ipoib_timeout(struct net_device *dev) 760 { 761 struct ipoib_dev_priv *priv = netdev_priv(dev); 762 763 ipoib_warn(priv, "transmit timeout: latency %d msecs\n", 764 jiffies_to_msecs(jiffies - dev->trans_start)); 765 ipoib_warn(priv, "queue stopped %d, tx_head %u, tx_tail %u\n", 766 netif_queue_stopped(dev), 767 priv->tx_head, priv->tx_tail); 768 /* XXX reset QP, etc. */ 769 } 770 771 static int ipoib_hard_header(struct sk_buff *skb, 772 struct net_device *dev, 773 unsigned short type, 774 const void *daddr, const void *saddr, unsigned len) 775 { 776 struct ipoib_header *header; 777 778 header = (struct ipoib_header *) skb_push(skb, sizeof *header); 779 780 header->proto = htons(type); 781 header->reserved = 0; 782 783 /* 784 * If we don't have a neighbour structure, stuff the 785 * destination address onto the front of the skb so we can 786 * figure out where to send the packet later. 787 */ 788 if ((!skb->dst || !skb->dst->neighbour) && daddr) { 789 struct ipoib_pseudoheader *phdr = 790 (struct ipoib_pseudoheader *) skb_push(skb, sizeof *phdr); 791 memcpy(phdr->hwaddr, daddr, INFINIBAND_ALEN); 792 } 793 794 return 0; 795 } 796 797 static void ipoib_set_mcast_list(struct net_device *dev) 798 { 799 struct ipoib_dev_priv *priv = netdev_priv(dev); 800 801 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) { 802 ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set"); 803 return; 804 } 805 806 queue_work(ipoib_workqueue, &priv->restart_task); 807 } 808 809 static void ipoib_neigh_cleanup(struct neighbour *n) 810 { 811 struct ipoib_neigh *neigh; 812 struct ipoib_dev_priv *priv = netdev_priv(n->dev); 813 unsigned long flags; 814 struct ipoib_ah *ah = NULL; 815 816 neigh = *to_ipoib_neigh(n); 817 if (neigh) 818 priv = netdev_priv(neigh->dev); 819 else 820 return; 821 ipoib_dbg(priv, 822 "neigh_cleanup for %06x " IPOIB_GID_FMT "\n", 823 IPOIB_QPN(n->ha), 824 IPOIB_GID_RAW_ARG(n->ha + 4)); 825 826 spin_lock_irqsave(&priv->lock, flags); 827 828 if (neigh->ah) 829 ah = neigh->ah; 830 list_del(&neigh->list); 831 ipoib_neigh_free(n->dev, neigh); 832 833 spin_unlock_irqrestore(&priv->lock, flags); 834 835 if (ah) 836 ipoib_put_ah(ah); 837 } 838 839 struct ipoib_neigh *ipoib_neigh_alloc(struct neighbour *neighbour, 840 struct net_device *dev) 841 { 842 struct ipoib_neigh *neigh; 843 844 neigh = kmalloc(sizeof *neigh, GFP_ATOMIC); 845 if (!neigh) 846 return NULL; 847 848 neigh->neighbour = neighbour; 849 neigh->dev = dev; 850 *to_ipoib_neigh(neighbour) = neigh; 851 skb_queue_head_init(&neigh->queue); 852 ipoib_cm_set(neigh, NULL); 853 854 return neigh; 855 } 856 857 void ipoib_neigh_free(struct net_device *dev, struct ipoib_neigh *neigh) 858 { 859 struct sk_buff *skb; 860 *to_ipoib_neigh(neigh->neighbour) = NULL; 861 while ((skb = __skb_dequeue(&neigh->queue))) { 862 ++dev->stats.tx_dropped; 863 dev_kfree_skb_any(skb); 864 } 865 if (ipoib_cm_get(neigh)) 866 ipoib_cm_destroy_tx(ipoib_cm_get(neigh)); 867 kfree(neigh); 868 } 869 870 static int ipoib_neigh_setup_dev(struct net_device *dev, struct neigh_parms *parms) 871 { 872 parms->neigh_cleanup = ipoib_neigh_cleanup; 873 874 return 0; 875 } 876 877 int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port) 878 { 879 struct ipoib_dev_priv *priv = netdev_priv(dev); 880 881 /* Allocate RX/TX "rings" to hold queued skbs */ 882 priv->rx_ring = kzalloc(ipoib_recvq_size * sizeof *priv->rx_ring, 883 GFP_KERNEL); 884 if (!priv->rx_ring) { 885 printk(KERN_WARNING "%s: failed to allocate RX ring (%d entries)\n", 886 ca->name, ipoib_recvq_size); 887 goto out; 888 } 889 890 priv->tx_ring = vmalloc(ipoib_sendq_size * sizeof *priv->tx_ring); 891 if (!priv->tx_ring) { 892 printk(KERN_WARNING "%s: failed to allocate TX ring (%d entries)\n", 893 ca->name, ipoib_sendq_size); 894 goto out_rx_ring_cleanup; 895 } 896 memset(priv->tx_ring, 0, ipoib_sendq_size * sizeof *priv->tx_ring); 897 898 /* priv->tx_head, tx_tail & tx_outstanding are already 0 */ 899 900 if (ipoib_ib_dev_init(dev, ca, port)) 901 goto out_tx_ring_cleanup; 902 903 return 0; 904 905 out_tx_ring_cleanup: 906 vfree(priv->tx_ring); 907 908 out_rx_ring_cleanup: 909 kfree(priv->rx_ring); 910 911 out: 912 return -ENOMEM; 913 } 914 915 void ipoib_dev_cleanup(struct net_device *dev) 916 { 917 struct ipoib_dev_priv *priv = netdev_priv(dev), *cpriv, *tcpriv; 918 919 ipoib_delete_debug_files(dev); 920 921 /* Delete any child interfaces first */ 922 list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) { 923 unregister_netdev(cpriv->dev); 924 ipoib_dev_cleanup(cpriv->dev); 925 free_netdev(cpriv->dev); 926 } 927 928 ipoib_ib_dev_cleanup(dev); 929 930 kfree(priv->rx_ring); 931 vfree(priv->tx_ring); 932 933 priv->rx_ring = NULL; 934 priv->tx_ring = NULL; 935 } 936 937 static const struct header_ops ipoib_header_ops = { 938 .create = ipoib_hard_header, 939 }; 940 941 static void ipoib_setup(struct net_device *dev) 942 { 943 struct ipoib_dev_priv *priv = netdev_priv(dev); 944 945 dev->open = ipoib_open; 946 dev->stop = ipoib_stop; 947 dev->change_mtu = ipoib_change_mtu; 948 dev->hard_start_xmit = ipoib_start_xmit; 949 dev->tx_timeout = ipoib_timeout; 950 dev->header_ops = &ipoib_header_ops; 951 dev->set_multicast_list = ipoib_set_mcast_list; 952 dev->neigh_setup = ipoib_neigh_setup_dev; 953 954 ipoib_set_ethtool_ops(dev); 955 956 netif_napi_add(dev, &priv->napi, ipoib_poll, 100); 957 958 dev->watchdog_timeo = HZ; 959 960 dev->flags |= IFF_BROADCAST | IFF_MULTICAST; 961 962 /* 963 * We add in INFINIBAND_ALEN to allow for the destination 964 * address "pseudoheader" for skbs without neighbour struct. 965 */ 966 dev->hard_header_len = IPOIB_ENCAP_LEN + INFINIBAND_ALEN; 967 dev->addr_len = INFINIBAND_ALEN; 968 dev->type = ARPHRD_INFINIBAND; 969 dev->tx_queue_len = ipoib_sendq_size * 2; 970 dev->features = (NETIF_F_VLAN_CHALLENGED | 971 NETIF_F_LLTX | 972 NETIF_F_HIGHDMA); 973 974 memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN); 975 976 netif_carrier_off(dev); 977 978 priv->dev = dev; 979 980 spin_lock_init(&priv->lock); 981 spin_lock_init(&priv->tx_lock); 982 983 mutex_init(&priv->mcast_mutex); 984 mutex_init(&priv->vlan_mutex); 985 986 INIT_LIST_HEAD(&priv->path_list); 987 INIT_LIST_HEAD(&priv->child_intfs); 988 INIT_LIST_HEAD(&priv->dead_ahs); 989 INIT_LIST_HEAD(&priv->multicast_list); 990 991 INIT_DELAYED_WORK(&priv->pkey_poll_task, ipoib_pkey_poll); 992 INIT_WORK(&priv->pkey_event_task, ipoib_pkey_event); 993 INIT_DELAYED_WORK(&priv->mcast_task, ipoib_mcast_join_task); 994 INIT_WORK(&priv->flush_task, ipoib_ib_dev_flush); 995 INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task); 996 INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah); 997 } 998 999 struct ipoib_dev_priv *ipoib_intf_alloc(const char *name) 1000 { 1001 struct net_device *dev; 1002 1003 dev = alloc_netdev((int) sizeof (struct ipoib_dev_priv), name, 1004 ipoib_setup); 1005 if (!dev) 1006 return NULL; 1007 1008 return netdev_priv(dev); 1009 } 1010 1011 static ssize_t show_pkey(struct device *dev, 1012 struct device_attribute *attr, char *buf) 1013 { 1014 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev)); 1015 1016 return sprintf(buf, "0x%04x\n", priv->pkey); 1017 } 1018 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL); 1019 1020 static ssize_t show_umcast(struct device *dev, 1021 struct device_attribute *attr, char *buf) 1022 { 1023 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev)); 1024 1025 return sprintf(buf, "%d\n", test_bit(IPOIB_FLAG_UMCAST, &priv->flags)); 1026 } 1027 1028 static ssize_t set_umcast(struct device *dev, 1029 struct device_attribute *attr, 1030 const char *buf, size_t count) 1031 { 1032 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev)); 1033 unsigned long umcast_val = simple_strtoul(buf, NULL, 0); 1034 1035 if (umcast_val > 0) { 1036 set_bit(IPOIB_FLAG_UMCAST, &priv->flags); 1037 ipoib_warn(priv, "ignoring multicast groups joined directly " 1038 "by userspace\n"); 1039 } else 1040 clear_bit(IPOIB_FLAG_UMCAST, &priv->flags); 1041 1042 return count; 1043 } 1044 static DEVICE_ATTR(umcast, S_IWUSR | S_IRUGO, show_umcast, set_umcast); 1045 1046 int ipoib_add_umcast_attr(struct net_device *dev) 1047 { 1048 return device_create_file(&dev->dev, &dev_attr_umcast); 1049 } 1050 1051 static ssize_t create_child(struct device *dev, 1052 struct device_attribute *attr, 1053 const char *buf, size_t count) 1054 { 1055 int pkey; 1056 int ret; 1057 1058 if (sscanf(buf, "%i", &pkey) != 1) 1059 return -EINVAL; 1060 1061 if (pkey < 0 || pkey > 0xffff) 1062 return -EINVAL; 1063 1064 /* 1065 * Set the full membership bit, so that we join the right 1066 * broadcast group, etc. 1067 */ 1068 pkey |= 0x8000; 1069 1070 ret = ipoib_vlan_add(to_net_dev(dev), pkey); 1071 1072 return ret ? ret : count; 1073 } 1074 static DEVICE_ATTR(create_child, S_IWUGO, NULL, create_child); 1075 1076 static ssize_t delete_child(struct device *dev, 1077 struct device_attribute *attr, 1078 const char *buf, size_t count) 1079 { 1080 int pkey; 1081 int ret; 1082 1083 if (sscanf(buf, "%i", &pkey) != 1) 1084 return -EINVAL; 1085 1086 if (pkey < 0 || pkey > 0xffff) 1087 return -EINVAL; 1088 1089 ret = ipoib_vlan_delete(to_net_dev(dev), pkey); 1090 1091 return ret ? ret : count; 1092 1093 } 1094 static DEVICE_ATTR(delete_child, S_IWUGO, NULL, delete_child); 1095 1096 int ipoib_add_pkey_attr(struct net_device *dev) 1097 { 1098 return device_create_file(&dev->dev, &dev_attr_pkey); 1099 } 1100 1101 static struct net_device *ipoib_add_port(const char *format, 1102 struct ib_device *hca, u8 port) 1103 { 1104 struct ipoib_dev_priv *priv; 1105 struct ib_device_attr *device_attr; 1106 struct ib_port_attr attr; 1107 int result = -ENOMEM; 1108 1109 priv = ipoib_intf_alloc(format); 1110 if (!priv) 1111 goto alloc_mem_failed; 1112 1113 SET_NETDEV_DEV(priv->dev, hca->dma_device); 1114 1115 if (!ib_query_port(hca, port, &attr)) 1116 priv->max_ib_mtu = ib_mtu_enum_to_int(attr.max_mtu); 1117 else { 1118 printk(KERN_WARNING "%s: ib_query_port %d failed\n", 1119 hca->name, port); 1120 goto device_init_failed; 1121 } 1122 1123 /* MTU will be reset when mcast join happens */ 1124 priv->dev->mtu = IPOIB_UD_MTU(priv->max_ib_mtu); 1125 priv->mcast_mtu = priv->admin_mtu = priv->dev->mtu; 1126 1127 result = ib_query_pkey(hca, port, 0, &priv->pkey); 1128 if (result) { 1129 printk(KERN_WARNING "%s: ib_query_pkey port %d failed (ret = %d)\n", 1130 hca->name, port, result); 1131 goto device_init_failed; 1132 } 1133 1134 device_attr = kmalloc(sizeof *device_attr, GFP_KERNEL); 1135 if (!device_attr) { 1136 printk(KERN_WARNING "%s: allocation of %zu bytes failed\n", 1137 hca->name, sizeof *device_attr); 1138 goto device_init_failed; 1139 } 1140 1141 result = ib_query_device(hca, device_attr); 1142 if (result) { 1143 printk(KERN_WARNING "%s: ib_query_device failed (ret = %d)\n", 1144 hca->name, result); 1145 kfree(device_attr); 1146 goto device_init_failed; 1147 } 1148 priv->hca_caps = device_attr->device_cap_flags; 1149 1150 kfree(device_attr); 1151 1152 if (priv->hca_caps & IB_DEVICE_UD_IP_CSUM) { 1153 set_bit(IPOIB_FLAG_CSUM, &priv->flags); 1154 priv->dev->features |= NETIF_F_SG | NETIF_F_IP_CSUM; 1155 } 1156 1157 /* 1158 * Set the full membership bit, so that we join the right 1159 * broadcast group, etc. 1160 */ 1161 priv->pkey |= 0x8000; 1162 1163 priv->dev->broadcast[8] = priv->pkey >> 8; 1164 priv->dev->broadcast[9] = priv->pkey & 0xff; 1165 1166 result = ib_query_gid(hca, port, 0, &priv->local_gid); 1167 if (result) { 1168 printk(KERN_WARNING "%s: ib_query_gid port %d failed (ret = %d)\n", 1169 hca->name, port, result); 1170 goto device_init_failed; 1171 } else 1172 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid)); 1173 1174 result = ipoib_dev_init(priv->dev, hca, port); 1175 if (result < 0) { 1176 printk(KERN_WARNING "%s: failed to initialize port %d (ret = %d)\n", 1177 hca->name, port, result); 1178 goto device_init_failed; 1179 } 1180 1181 INIT_IB_EVENT_HANDLER(&priv->event_handler, 1182 priv->ca, ipoib_event); 1183 result = ib_register_event_handler(&priv->event_handler); 1184 if (result < 0) { 1185 printk(KERN_WARNING "%s: ib_register_event_handler failed for " 1186 "port %d (ret = %d)\n", 1187 hca->name, port, result); 1188 goto event_failed; 1189 } 1190 1191 if (priv->dev->features & NETIF_F_SG && priv->hca_caps & IB_DEVICE_UD_TSO) 1192 priv->dev->features |= NETIF_F_TSO; 1193 1194 result = register_netdev(priv->dev); 1195 if (result) { 1196 printk(KERN_WARNING "%s: couldn't register ipoib port %d; error %d\n", 1197 hca->name, port, result); 1198 goto register_failed; 1199 } 1200 1201 ipoib_create_debug_files(priv->dev); 1202 1203 if (ipoib_cm_add_mode_attr(priv->dev)) 1204 goto sysfs_failed; 1205 if (ipoib_add_pkey_attr(priv->dev)) 1206 goto sysfs_failed; 1207 if (ipoib_add_umcast_attr(priv->dev)) 1208 goto sysfs_failed; 1209 if (device_create_file(&priv->dev->dev, &dev_attr_create_child)) 1210 goto sysfs_failed; 1211 if (device_create_file(&priv->dev->dev, &dev_attr_delete_child)) 1212 goto sysfs_failed; 1213 1214 return priv->dev; 1215 1216 sysfs_failed: 1217 ipoib_delete_debug_files(priv->dev); 1218 unregister_netdev(priv->dev); 1219 1220 register_failed: 1221 ib_unregister_event_handler(&priv->event_handler); 1222 flush_scheduled_work(); 1223 1224 event_failed: 1225 ipoib_dev_cleanup(priv->dev); 1226 1227 device_init_failed: 1228 free_netdev(priv->dev); 1229 1230 alloc_mem_failed: 1231 return ERR_PTR(result); 1232 } 1233 1234 static void ipoib_add_one(struct ib_device *device) 1235 { 1236 struct list_head *dev_list; 1237 struct net_device *dev; 1238 struct ipoib_dev_priv *priv; 1239 int s, e, p; 1240 1241 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB) 1242 return; 1243 1244 dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL); 1245 if (!dev_list) 1246 return; 1247 1248 INIT_LIST_HEAD(dev_list); 1249 1250 if (device->node_type == RDMA_NODE_IB_SWITCH) { 1251 s = 0; 1252 e = 0; 1253 } else { 1254 s = 1; 1255 e = device->phys_port_cnt; 1256 } 1257 1258 for (p = s; p <= e; ++p) { 1259 dev = ipoib_add_port("ib%d", device, p); 1260 if (!IS_ERR(dev)) { 1261 priv = netdev_priv(dev); 1262 list_add_tail(&priv->list, dev_list); 1263 } 1264 } 1265 1266 ib_set_client_data(device, &ipoib_client, dev_list); 1267 } 1268 1269 static void ipoib_remove_one(struct ib_device *device) 1270 { 1271 struct ipoib_dev_priv *priv, *tmp; 1272 struct list_head *dev_list; 1273 1274 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB) 1275 return; 1276 1277 dev_list = ib_get_client_data(device, &ipoib_client); 1278 1279 list_for_each_entry_safe(priv, tmp, dev_list, list) { 1280 ib_unregister_event_handler(&priv->event_handler); 1281 flush_scheduled_work(); 1282 1283 unregister_netdev(priv->dev); 1284 ipoib_dev_cleanup(priv->dev); 1285 free_netdev(priv->dev); 1286 } 1287 1288 kfree(dev_list); 1289 } 1290 1291 static int __init ipoib_init_module(void) 1292 { 1293 int ret; 1294 1295 ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size); 1296 ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE); 1297 ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE); 1298 1299 ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size); 1300 ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE); 1301 ipoib_sendq_size = max(ipoib_sendq_size, max(2 * MAX_SEND_CQE, 1302 IPOIB_MIN_QUEUE_SIZE)); 1303 #ifdef CONFIG_INFINIBAND_IPOIB_CM 1304 ipoib_max_conn_qp = min(ipoib_max_conn_qp, IPOIB_CM_MAX_CONN_QP); 1305 #endif 1306 1307 ret = ipoib_register_debugfs(); 1308 if (ret) 1309 return ret; 1310 1311 /* 1312 * We create our own workqueue mainly because we want to be 1313 * able to flush it when devices are being removed. We can't 1314 * use schedule_work()/flush_scheduled_work() because both 1315 * unregister_netdev() and linkwatch_event take the rtnl lock, 1316 * so flush_scheduled_work() can deadlock during device 1317 * removal. 1318 */ 1319 ipoib_workqueue = create_singlethread_workqueue("ipoib"); 1320 if (!ipoib_workqueue) { 1321 ret = -ENOMEM; 1322 goto err_fs; 1323 } 1324 1325 ib_sa_register_client(&ipoib_sa_client); 1326 1327 ret = ib_register_client(&ipoib_client); 1328 if (ret) 1329 goto err_sa; 1330 1331 return 0; 1332 1333 err_sa: 1334 ib_sa_unregister_client(&ipoib_sa_client); 1335 destroy_workqueue(ipoib_workqueue); 1336 1337 err_fs: 1338 ipoib_unregister_debugfs(); 1339 1340 return ret; 1341 } 1342 1343 static void __exit ipoib_cleanup_module(void) 1344 { 1345 ib_unregister_client(&ipoib_client); 1346 ib_sa_unregister_client(&ipoib_sa_client); 1347 ipoib_unregister_debugfs(); 1348 destroy_workqueue(ipoib_workqueue); 1349 } 1350 1351 module_init(ipoib_init_module); 1352 module_exit(ipoib_cleanup_module); 1353