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 <linux/jhash.h> 50 #include <net/arp.h> 51 52 #define DRV_VERSION "1.0.0" 53 54 const char ipoib_driver_version[] = DRV_VERSION; 55 56 MODULE_AUTHOR("Roland Dreier"); 57 MODULE_DESCRIPTION("IP-over-InfiniBand net driver"); 58 MODULE_LICENSE("Dual BSD/GPL"); 59 MODULE_VERSION(DRV_VERSION); 60 61 int ipoib_sendq_size __read_mostly = IPOIB_TX_RING_SIZE; 62 int ipoib_recvq_size __read_mostly = IPOIB_RX_RING_SIZE; 63 64 module_param_named(send_queue_size, ipoib_sendq_size, int, 0444); 65 MODULE_PARM_DESC(send_queue_size, "Number of descriptors in send queue"); 66 module_param_named(recv_queue_size, ipoib_recvq_size, int, 0444); 67 MODULE_PARM_DESC(recv_queue_size, "Number of descriptors in receive queue"); 68 69 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG 70 int ipoib_debug_level; 71 72 module_param_named(debug_level, ipoib_debug_level, int, 0644); 73 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0"); 74 #endif 75 76 struct ipoib_path_iter { 77 struct net_device *dev; 78 struct ipoib_path path; 79 }; 80 81 static const u8 ipv4_bcast_addr[] = { 82 0x00, 0xff, 0xff, 0xff, 83 0xff, 0x12, 0x40, 0x1b, 0x00, 0x00, 0x00, 0x00, 84 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff 85 }; 86 87 struct workqueue_struct *ipoib_workqueue; 88 89 struct ib_sa_client ipoib_sa_client; 90 91 static void ipoib_add_one(struct ib_device *device); 92 static void ipoib_remove_one(struct ib_device *device); 93 static void ipoib_neigh_reclaim(struct rcu_head *rp); 94 95 static struct ib_client ipoib_client = { 96 .name = "ipoib", 97 .add = ipoib_add_one, 98 .remove = ipoib_remove_one 99 }; 100 101 int ipoib_open(struct net_device *dev) 102 { 103 struct ipoib_dev_priv *priv = netdev_priv(dev); 104 105 ipoib_dbg(priv, "bringing up interface\n"); 106 107 netif_carrier_off(dev); 108 109 set_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags); 110 111 if (ipoib_ib_dev_open(dev, 1)) { 112 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) 113 return 0; 114 goto err_disable; 115 } 116 117 if (ipoib_ib_dev_up(dev)) 118 goto err_stop; 119 120 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) { 121 struct ipoib_dev_priv *cpriv; 122 123 /* Bring up any child interfaces too */ 124 down_read(&priv->vlan_rwsem); 125 list_for_each_entry(cpriv, &priv->child_intfs, list) { 126 int flags; 127 128 flags = cpriv->dev->flags; 129 if (flags & IFF_UP) 130 continue; 131 132 dev_change_flags(cpriv->dev, flags | IFF_UP); 133 } 134 up_read(&priv->vlan_rwsem); 135 } 136 137 netif_start_queue(dev); 138 139 return 0; 140 141 err_stop: 142 ipoib_ib_dev_stop(dev, 1); 143 144 err_disable: 145 clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags); 146 147 return -EINVAL; 148 } 149 150 static int ipoib_stop(struct net_device *dev) 151 { 152 struct ipoib_dev_priv *priv = netdev_priv(dev); 153 154 ipoib_dbg(priv, "stopping interface\n"); 155 156 clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags); 157 158 netif_stop_queue(dev); 159 160 ipoib_ib_dev_down(dev, 1); 161 ipoib_ib_dev_stop(dev, 0); 162 163 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) { 164 struct ipoib_dev_priv *cpriv; 165 166 /* Bring down any child interfaces too */ 167 down_read(&priv->vlan_rwsem); 168 list_for_each_entry(cpriv, &priv->child_intfs, list) { 169 int flags; 170 171 flags = cpriv->dev->flags; 172 if (!(flags & IFF_UP)) 173 continue; 174 175 dev_change_flags(cpriv->dev, flags & ~IFF_UP); 176 } 177 up_read(&priv->vlan_rwsem); 178 } 179 180 return 0; 181 } 182 183 static void ipoib_uninit(struct net_device *dev) 184 { 185 ipoib_dev_cleanup(dev); 186 } 187 188 static netdev_features_t ipoib_fix_features(struct net_device *dev, netdev_features_t features) 189 { 190 struct ipoib_dev_priv *priv = netdev_priv(dev); 191 192 if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags)) 193 features &= ~(NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_TSO); 194 195 return features; 196 } 197 198 static int ipoib_change_mtu(struct net_device *dev, int new_mtu) 199 { 200 struct ipoib_dev_priv *priv = netdev_priv(dev); 201 202 /* dev->mtu > 2K ==> connected mode */ 203 if (ipoib_cm_admin_enabled(dev)) { 204 if (new_mtu > ipoib_cm_max_mtu(dev)) 205 return -EINVAL; 206 207 if (new_mtu > priv->mcast_mtu) 208 ipoib_warn(priv, "mtu > %d will cause multicast packet drops.\n", 209 priv->mcast_mtu); 210 211 dev->mtu = new_mtu; 212 return 0; 213 } 214 215 if (new_mtu > IPOIB_UD_MTU(priv->max_ib_mtu)) 216 return -EINVAL; 217 218 priv->admin_mtu = new_mtu; 219 220 dev->mtu = min(priv->mcast_mtu, priv->admin_mtu); 221 222 return 0; 223 } 224 225 int ipoib_set_mode(struct net_device *dev, const char *buf) 226 { 227 struct ipoib_dev_priv *priv = netdev_priv(dev); 228 229 /* flush paths if we switch modes so that connections are restarted */ 230 if (IPOIB_CM_SUPPORTED(dev->dev_addr) && !strcmp(buf, "connected\n")) { 231 set_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags); 232 ipoib_warn(priv, "enabling connected mode " 233 "will cause multicast packet drops\n"); 234 netdev_update_features(dev); 235 rtnl_unlock(); 236 priv->tx_wr.send_flags &= ~IB_SEND_IP_CSUM; 237 238 ipoib_flush_paths(dev); 239 rtnl_lock(); 240 return 0; 241 } 242 243 if (!strcmp(buf, "datagram\n")) { 244 clear_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags); 245 netdev_update_features(dev); 246 dev_set_mtu(dev, min(priv->mcast_mtu, dev->mtu)); 247 rtnl_unlock(); 248 ipoib_flush_paths(dev); 249 rtnl_lock(); 250 return 0; 251 } 252 253 return -EINVAL; 254 } 255 256 static struct ipoib_path *__path_find(struct net_device *dev, void *gid) 257 { 258 struct ipoib_dev_priv *priv = netdev_priv(dev); 259 struct rb_node *n = priv->path_tree.rb_node; 260 struct ipoib_path *path; 261 int ret; 262 263 while (n) { 264 path = rb_entry(n, struct ipoib_path, rb_node); 265 266 ret = memcmp(gid, path->pathrec.dgid.raw, 267 sizeof (union ib_gid)); 268 269 if (ret < 0) 270 n = n->rb_left; 271 else if (ret > 0) 272 n = n->rb_right; 273 else 274 return path; 275 } 276 277 return NULL; 278 } 279 280 static int __path_add(struct net_device *dev, struct ipoib_path *path) 281 { 282 struct ipoib_dev_priv *priv = netdev_priv(dev); 283 struct rb_node **n = &priv->path_tree.rb_node; 284 struct rb_node *pn = NULL; 285 struct ipoib_path *tpath; 286 int ret; 287 288 while (*n) { 289 pn = *n; 290 tpath = rb_entry(pn, struct ipoib_path, rb_node); 291 292 ret = memcmp(path->pathrec.dgid.raw, tpath->pathrec.dgid.raw, 293 sizeof (union ib_gid)); 294 if (ret < 0) 295 n = &pn->rb_left; 296 else if (ret > 0) 297 n = &pn->rb_right; 298 else 299 return -EEXIST; 300 } 301 302 rb_link_node(&path->rb_node, pn, n); 303 rb_insert_color(&path->rb_node, &priv->path_tree); 304 305 list_add_tail(&path->list, &priv->path_list); 306 307 return 0; 308 } 309 310 static void path_free(struct net_device *dev, struct ipoib_path *path) 311 { 312 struct sk_buff *skb; 313 314 while ((skb = __skb_dequeue(&path->queue))) 315 dev_kfree_skb_irq(skb); 316 317 ipoib_dbg(netdev_priv(dev), "path_free\n"); 318 319 /* remove all neigh connected to this path */ 320 ipoib_del_neighs_by_gid(dev, path->pathrec.dgid.raw); 321 322 if (path->ah) 323 ipoib_put_ah(path->ah); 324 325 kfree(path); 326 } 327 328 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG 329 330 struct ipoib_path_iter *ipoib_path_iter_init(struct net_device *dev) 331 { 332 struct ipoib_path_iter *iter; 333 334 iter = kmalloc(sizeof *iter, GFP_KERNEL); 335 if (!iter) 336 return NULL; 337 338 iter->dev = dev; 339 memset(iter->path.pathrec.dgid.raw, 0, 16); 340 341 if (ipoib_path_iter_next(iter)) { 342 kfree(iter); 343 return NULL; 344 } 345 346 return iter; 347 } 348 349 int ipoib_path_iter_next(struct ipoib_path_iter *iter) 350 { 351 struct ipoib_dev_priv *priv = netdev_priv(iter->dev); 352 struct rb_node *n; 353 struct ipoib_path *path; 354 int ret = 1; 355 356 spin_lock_irq(&priv->lock); 357 358 n = rb_first(&priv->path_tree); 359 360 while (n) { 361 path = rb_entry(n, struct ipoib_path, rb_node); 362 363 if (memcmp(iter->path.pathrec.dgid.raw, path->pathrec.dgid.raw, 364 sizeof (union ib_gid)) < 0) { 365 iter->path = *path; 366 ret = 0; 367 break; 368 } 369 370 n = rb_next(n); 371 } 372 373 spin_unlock_irq(&priv->lock); 374 375 return ret; 376 } 377 378 void ipoib_path_iter_read(struct ipoib_path_iter *iter, 379 struct ipoib_path *path) 380 { 381 *path = iter->path; 382 } 383 384 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */ 385 386 void ipoib_mark_paths_invalid(struct net_device *dev) 387 { 388 struct ipoib_dev_priv *priv = netdev_priv(dev); 389 struct ipoib_path *path, *tp; 390 391 spin_lock_irq(&priv->lock); 392 393 list_for_each_entry_safe(path, tp, &priv->path_list, list) { 394 ipoib_dbg(priv, "mark path LID 0x%04x GID %pI6 invalid\n", 395 be16_to_cpu(path->pathrec.dlid), 396 path->pathrec.dgid.raw); 397 path->valid = 0; 398 } 399 400 spin_unlock_irq(&priv->lock); 401 } 402 403 void ipoib_flush_paths(struct net_device *dev) 404 { 405 struct ipoib_dev_priv *priv = netdev_priv(dev); 406 struct ipoib_path *path, *tp; 407 LIST_HEAD(remove_list); 408 unsigned long flags; 409 410 netif_tx_lock_bh(dev); 411 spin_lock_irqsave(&priv->lock, flags); 412 413 list_splice_init(&priv->path_list, &remove_list); 414 415 list_for_each_entry(path, &remove_list, list) 416 rb_erase(&path->rb_node, &priv->path_tree); 417 418 list_for_each_entry_safe(path, tp, &remove_list, list) { 419 if (path->query) 420 ib_sa_cancel_query(path->query_id, path->query); 421 spin_unlock_irqrestore(&priv->lock, flags); 422 netif_tx_unlock_bh(dev); 423 wait_for_completion(&path->done); 424 path_free(dev, path); 425 netif_tx_lock_bh(dev); 426 spin_lock_irqsave(&priv->lock, flags); 427 } 428 429 spin_unlock_irqrestore(&priv->lock, flags); 430 netif_tx_unlock_bh(dev); 431 } 432 433 static void path_rec_completion(int status, 434 struct ib_sa_path_rec *pathrec, 435 void *path_ptr) 436 { 437 struct ipoib_path *path = path_ptr; 438 struct net_device *dev = path->dev; 439 struct ipoib_dev_priv *priv = netdev_priv(dev); 440 struct ipoib_ah *ah = NULL; 441 struct ipoib_ah *old_ah = NULL; 442 struct ipoib_neigh *neigh, *tn; 443 struct sk_buff_head skqueue; 444 struct sk_buff *skb; 445 unsigned long flags; 446 447 if (!status) 448 ipoib_dbg(priv, "PathRec LID 0x%04x for GID %pI6\n", 449 be16_to_cpu(pathrec->dlid), pathrec->dgid.raw); 450 else 451 ipoib_dbg(priv, "PathRec status %d for GID %pI6\n", 452 status, path->pathrec.dgid.raw); 453 454 skb_queue_head_init(&skqueue); 455 456 if (!status) { 457 struct ib_ah_attr av; 458 459 if (!ib_init_ah_from_path(priv->ca, priv->port, pathrec, &av)) 460 ah = ipoib_create_ah(dev, priv->pd, &av); 461 } 462 463 spin_lock_irqsave(&priv->lock, flags); 464 465 if (!IS_ERR_OR_NULL(ah)) { 466 path->pathrec = *pathrec; 467 468 old_ah = path->ah; 469 path->ah = ah; 470 471 ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n", 472 ah, be16_to_cpu(pathrec->dlid), pathrec->sl); 473 474 while ((skb = __skb_dequeue(&path->queue))) 475 __skb_queue_tail(&skqueue, skb); 476 477 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) { 478 if (neigh->ah) { 479 WARN_ON(neigh->ah != old_ah); 480 /* 481 * Dropping the ah reference inside 482 * priv->lock is safe here, because we 483 * will hold one more reference from 484 * the original value of path->ah (ie 485 * old_ah). 486 */ 487 ipoib_put_ah(neigh->ah); 488 } 489 kref_get(&path->ah->ref); 490 neigh->ah = path->ah; 491 492 if (ipoib_cm_enabled(dev, neigh->daddr)) { 493 if (!ipoib_cm_get(neigh)) 494 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, 495 path, 496 neigh)); 497 if (!ipoib_cm_get(neigh)) { 498 ipoib_neigh_free(neigh); 499 continue; 500 } 501 } 502 503 while ((skb = __skb_dequeue(&neigh->queue))) 504 __skb_queue_tail(&skqueue, skb); 505 } 506 path->valid = 1; 507 } 508 509 path->query = NULL; 510 complete(&path->done); 511 512 spin_unlock_irqrestore(&priv->lock, flags); 513 514 if (IS_ERR_OR_NULL(ah)) 515 ipoib_del_neighs_by_gid(dev, path->pathrec.dgid.raw); 516 517 if (old_ah) 518 ipoib_put_ah(old_ah); 519 520 while ((skb = __skb_dequeue(&skqueue))) { 521 skb->dev = dev; 522 if (dev_queue_xmit(skb)) 523 ipoib_warn(priv, "dev_queue_xmit failed " 524 "to requeue packet\n"); 525 } 526 } 527 528 static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid) 529 { 530 struct ipoib_dev_priv *priv = netdev_priv(dev); 531 struct ipoib_path *path; 532 533 if (!priv->broadcast) 534 return NULL; 535 536 path = kzalloc(sizeof *path, GFP_ATOMIC); 537 if (!path) 538 return NULL; 539 540 path->dev = dev; 541 542 skb_queue_head_init(&path->queue); 543 544 INIT_LIST_HEAD(&path->neigh_list); 545 546 memcpy(path->pathrec.dgid.raw, gid, sizeof (union ib_gid)); 547 path->pathrec.sgid = priv->local_gid; 548 path->pathrec.pkey = cpu_to_be16(priv->pkey); 549 path->pathrec.numb_path = 1; 550 path->pathrec.traffic_class = priv->broadcast->mcmember.traffic_class; 551 552 return path; 553 } 554 555 static int path_rec_start(struct net_device *dev, 556 struct ipoib_path *path) 557 { 558 struct ipoib_dev_priv *priv = netdev_priv(dev); 559 560 ipoib_dbg(priv, "Start path record lookup for %pI6\n", 561 path->pathrec.dgid.raw); 562 563 init_completion(&path->done); 564 565 path->query_id = 566 ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port, 567 &path->pathrec, 568 IB_SA_PATH_REC_DGID | 569 IB_SA_PATH_REC_SGID | 570 IB_SA_PATH_REC_NUMB_PATH | 571 IB_SA_PATH_REC_TRAFFIC_CLASS | 572 IB_SA_PATH_REC_PKEY, 573 1000, GFP_ATOMIC, 574 path_rec_completion, 575 path, &path->query); 576 if (path->query_id < 0) { 577 ipoib_warn(priv, "ib_sa_path_rec_get failed: %d\n", path->query_id); 578 path->query = NULL; 579 complete(&path->done); 580 return path->query_id; 581 } 582 583 return 0; 584 } 585 586 static void neigh_add_path(struct sk_buff *skb, u8 *daddr, 587 struct net_device *dev) 588 { 589 struct ipoib_dev_priv *priv = netdev_priv(dev); 590 struct ipoib_path *path; 591 struct ipoib_neigh *neigh; 592 unsigned long flags; 593 594 spin_lock_irqsave(&priv->lock, flags); 595 neigh = ipoib_neigh_alloc(daddr, dev); 596 if (!neigh) { 597 spin_unlock_irqrestore(&priv->lock, flags); 598 ++dev->stats.tx_dropped; 599 dev_kfree_skb_any(skb); 600 return; 601 } 602 603 path = __path_find(dev, daddr + 4); 604 if (!path) { 605 path = path_rec_create(dev, daddr + 4); 606 if (!path) 607 goto err_path; 608 609 __path_add(dev, path); 610 } 611 612 list_add_tail(&neigh->list, &path->neigh_list); 613 614 if (path->ah) { 615 kref_get(&path->ah->ref); 616 neigh->ah = path->ah; 617 618 if (ipoib_cm_enabled(dev, neigh->daddr)) { 619 if (!ipoib_cm_get(neigh)) 620 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, path, neigh)); 621 if (!ipoib_cm_get(neigh)) { 622 ipoib_neigh_free(neigh); 623 goto err_drop; 624 } 625 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) 626 __skb_queue_tail(&neigh->queue, skb); 627 else { 628 ipoib_warn(priv, "queue length limit %d. Packet drop.\n", 629 skb_queue_len(&neigh->queue)); 630 goto err_drop; 631 } 632 } else { 633 spin_unlock_irqrestore(&priv->lock, flags); 634 ipoib_send(dev, skb, path->ah, IPOIB_QPN(daddr)); 635 ipoib_neigh_put(neigh); 636 return; 637 } 638 } else { 639 neigh->ah = NULL; 640 641 if (!path->query && path_rec_start(dev, path)) 642 goto err_path; 643 644 __skb_queue_tail(&neigh->queue, skb); 645 } 646 647 spin_unlock_irqrestore(&priv->lock, flags); 648 ipoib_neigh_put(neigh); 649 return; 650 651 err_path: 652 ipoib_neigh_free(neigh); 653 err_drop: 654 ++dev->stats.tx_dropped; 655 dev_kfree_skb_any(skb); 656 657 spin_unlock_irqrestore(&priv->lock, flags); 658 ipoib_neigh_put(neigh); 659 } 660 661 static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev, 662 struct ipoib_cb *cb) 663 { 664 struct ipoib_dev_priv *priv = netdev_priv(dev); 665 struct ipoib_path *path; 666 unsigned long flags; 667 668 spin_lock_irqsave(&priv->lock, flags); 669 670 path = __path_find(dev, cb->hwaddr + 4); 671 if (!path || !path->valid) { 672 int new_path = 0; 673 674 if (!path) { 675 path = path_rec_create(dev, cb->hwaddr + 4); 676 new_path = 1; 677 } 678 if (path) { 679 __skb_queue_tail(&path->queue, skb); 680 681 if (!path->query && path_rec_start(dev, path)) { 682 spin_unlock_irqrestore(&priv->lock, flags); 683 if (new_path) 684 path_free(dev, path); 685 return; 686 } else 687 __path_add(dev, path); 688 } else { 689 ++dev->stats.tx_dropped; 690 dev_kfree_skb_any(skb); 691 } 692 693 spin_unlock_irqrestore(&priv->lock, flags); 694 return; 695 } 696 697 if (path->ah) { 698 ipoib_dbg(priv, "Send unicast ARP to %04x\n", 699 be16_to_cpu(path->pathrec.dlid)); 700 701 spin_unlock_irqrestore(&priv->lock, flags); 702 ipoib_send(dev, skb, path->ah, IPOIB_QPN(cb->hwaddr)); 703 return; 704 } else if ((path->query || !path_rec_start(dev, path)) && 705 skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) { 706 __skb_queue_tail(&path->queue, skb); 707 } else { 708 ++dev->stats.tx_dropped; 709 dev_kfree_skb_any(skb); 710 } 711 712 spin_unlock_irqrestore(&priv->lock, flags); 713 } 714 715 static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev) 716 { 717 struct ipoib_dev_priv *priv = netdev_priv(dev); 718 struct ipoib_neigh *neigh; 719 struct ipoib_cb *cb = ipoib_skb_cb(skb); 720 struct ipoib_header *header; 721 unsigned long flags; 722 723 header = (struct ipoib_header *) skb->data; 724 725 if (unlikely(cb->hwaddr[4] == 0xff)) { 726 /* multicast, arrange "if" according to probability */ 727 if ((header->proto != htons(ETH_P_IP)) && 728 (header->proto != htons(ETH_P_IPV6)) && 729 (header->proto != htons(ETH_P_ARP)) && 730 (header->proto != htons(ETH_P_RARP)) && 731 (header->proto != htons(ETH_P_TIPC))) { 732 /* ethertype not supported by IPoIB */ 733 ++dev->stats.tx_dropped; 734 dev_kfree_skb_any(skb); 735 return NETDEV_TX_OK; 736 } 737 /* Add in the P_Key for multicast*/ 738 cb->hwaddr[8] = (priv->pkey >> 8) & 0xff; 739 cb->hwaddr[9] = priv->pkey & 0xff; 740 741 neigh = ipoib_neigh_get(dev, cb->hwaddr); 742 if (likely(neigh)) 743 goto send_using_neigh; 744 ipoib_mcast_send(dev, cb->hwaddr, skb); 745 return NETDEV_TX_OK; 746 } 747 748 /* unicast, arrange "switch" according to probability */ 749 switch (header->proto) { 750 case htons(ETH_P_IP): 751 case htons(ETH_P_IPV6): 752 case htons(ETH_P_TIPC): 753 neigh = ipoib_neigh_get(dev, cb->hwaddr); 754 if (unlikely(!neigh)) { 755 neigh_add_path(skb, cb->hwaddr, dev); 756 return NETDEV_TX_OK; 757 } 758 break; 759 case htons(ETH_P_ARP): 760 case htons(ETH_P_RARP): 761 /* for unicast ARP and RARP should always perform path find */ 762 unicast_arp_send(skb, dev, cb); 763 return NETDEV_TX_OK; 764 default: 765 /* ethertype not supported by IPoIB */ 766 ++dev->stats.tx_dropped; 767 dev_kfree_skb_any(skb); 768 return NETDEV_TX_OK; 769 } 770 771 send_using_neigh: 772 /* note we now hold a ref to neigh */ 773 if (ipoib_cm_get(neigh)) { 774 if (ipoib_cm_up(neigh)) { 775 ipoib_cm_send(dev, skb, ipoib_cm_get(neigh)); 776 goto unref; 777 } 778 } else if (neigh->ah) { 779 ipoib_send(dev, skb, neigh->ah, IPOIB_QPN(cb->hwaddr)); 780 goto unref; 781 } 782 783 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) { 784 spin_lock_irqsave(&priv->lock, flags); 785 __skb_queue_tail(&neigh->queue, skb); 786 spin_unlock_irqrestore(&priv->lock, flags); 787 } else { 788 ++dev->stats.tx_dropped; 789 dev_kfree_skb_any(skb); 790 } 791 792 unref: 793 ipoib_neigh_put(neigh); 794 795 return NETDEV_TX_OK; 796 } 797 798 static void ipoib_timeout(struct net_device *dev) 799 { 800 struct ipoib_dev_priv *priv = netdev_priv(dev); 801 802 ipoib_warn(priv, "transmit timeout: latency %d msecs\n", 803 jiffies_to_msecs(jiffies - dev->trans_start)); 804 ipoib_warn(priv, "queue stopped %d, tx_head %u, tx_tail %u\n", 805 netif_queue_stopped(dev), 806 priv->tx_head, priv->tx_tail); 807 /* XXX reset QP, etc. */ 808 } 809 810 static int ipoib_hard_header(struct sk_buff *skb, 811 struct net_device *dev, 812 unsigned short type, 813 const void *daddr, const void *saddr, unsigned len) 814 { 815 struct ipoib_header *header; 816 struct ipoib_cb *cb = ipoib_skb_cb(skb); 817 818 header = (struct ipoib_header *) skb_push(skb, sizeof *header); 819 820 header->proto = htons(type); 821 header->reserved = 0; 822 823 /* 824 * we don't rely on dst_entry structure, always stuff the 825 * destination address into skb->cb so we can figure out where 826 * to send the packet later. 827 */ 828 memcpy(cb->hwaddr, daddr, INFINIBAND_ALEN); 829 830 return sizeof *header; 831 } 832 833 static void ipoib_set_mcast_list(struct net_device *dev) 834 { 835 struct ipoib_dev_priv *priv = netdev_priv(dev); 836 837 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) { 838 ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set"); 839 return; 840 } 841 842 queue_work(ipoib_workqueue, &priv->restart_task); 843 } 844 845 static int ipoib_get_iflink(const struct net_device *dev) 846 { 847 struct ipoib_dev_priv *priv = netdev_priv(dev); 848 849 return priv->parent->ifindex; 850 } 851 852 static u32 ipoib_addr_hash(struct ipoib_neigh_hash *htbl, u8 *daddr) 853 { 854 /* 855 * Use only the address parts that contributes to spreading 856 * The subnet prefix is not used as one can not connect to 857 * same remote port (GUID) using the same remote QPN via two 858 * different subnets. 859 */ 860 /* qpn octets[1:4) & port GUID octets[12:20) */ 861 u32 *d32 = (u32 *) daddr; 862 u32 hv; 863 864 hv = jhash_3words(d32[3], d32[4], IPOIB_QPN_MASK & d32[0], 0); 865 return hv & htbl->mask; 866 } 867 868 struct ipoib_neigh *ipoib_neigh_get(struct net_device *dev, u8 *daddr) 869 { 870 struct ipoib_dev_priv *priv = netdev_priv(dev); 871 struct ipoib_neigh_table *ntbl = &priv->ntbl; 872 struct ipoib_neigh_hash *htbl; 873 struct ipoib_neigh *neigh = NULL; 874 u32 hash_val; 875 876 rcu_read_lock_bh(); 877 878 htbl = rcu_dereference_bh(ntbl->htbl); 879 880 if (!htbl) 881 goto out_unlock; 882 883 hash_val = ipoib_addr_hash(htbl, daddr); 884 for (neigh = rcu_dereference_bh(htbl->buckets[hash_val]); 885 neigh != NULL; 886 neigh = rcu_dereference_bh(neigh->hnext)) { 887 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) { 888 /* found, take one ref on behalf of the caller */ 889 if (!atomic_inc_not_zero(&neigh->refcnt)) { 890 /* deleted */ 891 neigh = NULL; 892 goto out_unlock; 893 } 894 neigh->alive = jiffies; 895 goto out_unlock; 896 } 897 } 898 899 out_unlock: 900 rcu_read_unlock_bh(); 901 return neigh; 902 } 903 904 static void __ipoib_reap_neigh(struct ipoib_dev_priv *priv) 905 { 906 struct ipoib_neigh_table *ntbl = &priv->ntbl; 907 struct ipoib_neigh_hash *htbl; 908 unsigned long neigh_obsolete; 909 unsigned long dt; 910 unsigned long flags; 911 int i; 912 913 if (test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags)) 914 return; 915 916 spin_lock_irqsave(&priv->lock, flags); 917 918 htbl = rcu_dereference_protected(ntbl->htbl, 919 lockdep_is_held(&priv->lock)); 920 921 if (!htbl) 922 goto out_unlock; 923 924 /* neigh is obsolete if it was idle for two GC periods */ 925 dt = 2 * arp_tbl.gc_interval; 926 neigh_obsolete = jiffies - dt; 927 /* handle possible race condition */ 928 if (test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags)) 929 goto out_unlock; 930 931 for (i = 0; i < htbl->size; i++) { 932 struct ipoib_neigh *neigh; 933 struct ipoib_neigh __rcu **np = &htbl->buckets[i]; 934 935 while ((neigh = rcu_dereference_protected(*np, 936 lockdep_is_held(&priv->lock))) != NULL) { 937 /* was the neigh idle for two GC periods */ 938 if (time_after(neigh_obsolete, neigh->alive)) { 939 rcu_assign_pointer(*np, 940 rcu_dereference_protected(neigh->hnext, 941 lockdep_is_held(&priv->lock))); 942 /* remove from path/mc list */ 943 list_del(&neigh->list); 944 call_rcu(&neigh->rcu, ipoib_neigh_reclaim); 945 } else { 946 np = &neigh->hnext; 947 } 948 949 } 950 } 951 952 out_unlock: 953 spin_unlock_irqrestore(&priv->lock, flags); 954 } 955 956 static void ipoib_reap_neigh(struct work_struct *work) 957 { 958 struct ipoib_dev_priv *priv = 959 container_of(work, struct ipoib_dev_priv, neigh_reap_task.work); 960 961 __ipoib_reap_neigh(priv); 962 963 if (!test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags)) 964 queue_delayed_work(ipoib_workqueue, &priv->neigh_reap_task, 965 arp_tbl.gc_interval); 966 } 967 968 969 static struct ipoib_neigh *ipoib_neigh_ctor(u8 *daddr, 970 struct net_device *dev) 971 { 972 struct ipoib_neigh *neigh; 973 974 neigh = kzalloc(sizeof *neigh, GFP_ATOMIC); 975 if (!neigh) 976 return NULL; 977 978 neigh->dev = dev; 979 memcpy(&neigh->daddr, daddr, sizeof(neigh->daddr)); 980 skb_queue_head_init(&neigh->queue); 981 INIT_LIST_HEAD(&neigh->list); 982 ipoib_cm_set(neigh, NULL); 983 /* one ref on behalf of the caller */ 984 atomic_set(&neigh->refcnt, 1); 985 986 return neigh; 987 } 988 989 struct ipoib_neigh *ipoib_neigh_alloc(u8 *daddr, 990 struct net_device *dev) 991 { 992 struct ipoib_dev_priv *priv = netdev_priv(dev); 993 struct ipoib_neigh_table *ntbl = &priv->ntbl; 994 struct ipoib_neigh_hash *htbl; 995 struct ipoib_neigh *neigh; 996 u32 hash_val; 997 998 htbl = rcu_dereference_protected(ntbl->htbl, 999 lockdep_is_held(&priv->lock)); 1000 if (!htbl) { 1001 neigh = NULL; 1002 goto out_unlock; 1003 } 1004 1005 /* need to add a new neigh, but maybe some other thread succeeded? 1006 * recalc hash, maybe hash resize took place so we do a search 1007 */ 1008 hash_val = ipoib_addr_hash(htbl, daddr); 1009 for (neigh = rcu_dereference_protected(htbl->buckets[hash_val], 1010 lockdep_is_held(&priv->lock)); 1011 neigh != NULL; 1012 neigh = rcu_dereference_protected(neigh->hnext, 1013 lockdep_is_held(&priv->lock))) { 1014 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) { 1015 /* found, take one ref on behalf of the caller */ 1016 if (!atomic_inc_not_zero(&neigh->refcnt)) { 1017 /* deleted */ 1018 neigh = NULL; 1019 break; 1020 } 1021 neigh->alive = jiffies; 1022 goto out_unlock; 1023 } 1024 } 1025 1026 neigh = ipoib_neigh_ctor(daddr, dev); 1027 if (!neigh) 1028 goto out_unlock; 1029 1030 /* one ref on behalf of the hash table */ 1031 atomic_inc(&neigh->refcnt); 1032 neigh->alive = jiffies; 1033 /* put in hash */ 1034 rcu_assign_pointer(neigh->hnext, 1035 rcu_dereference_protected(htbl->buckets[hash_val], 1036 lockdep_is_held(&priv->lock))); 1037 rcu_assign_pointer(htbl->buckets[hash_val], neigh); 1038 atomic_inc(&ntbl->entries); 1039 1040 out_unlock: 1041 1042 return neigh; 1043 } 1044 1045 void ipoib_neigh_dtor(struct ipoib_neigh *neigh) 1046 { 1047 /* neigh reference count was dropprd to zero */ 1048 struct net_device *dev = neigh->dev; 1049 struct ipoib_dev_priv *priv = netdev_priv(dev); 1050 struct sk_buff *skb; 1051 if (neigh->ah) 1052 ipoib_put_ah(neigh->ah); 1053 while ((skb = __skb_dequeue(&neigh->queue))) { 1054 ++dev->stats.tx_dropped; 1055 dev_kfree_skb_any(skb); 1056 } 1057 if (ipoib_cm_get(neigh)) 1058 ipoib_cm_destroy_tx(ipoib_cm_get(neigh)); 1059 ipoib_dbg(netdev_priv(dev), 1060 "neigh free for %06x %pI6\n", 1061 IPOIB_QPN(neigh->daddr), 1062 neigh->daddr + 4); 1063 kfree(neigh); 1064 if (atomic_dec_and_test(&priv->ntbl.entries)) { 1065 if (test_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags)) 1066 complete(&priv->ntbl.flushed); 1067 } 1068 } 1069 1070 static void ipoib_neigh_reclaim(struct rcu_head *rp) 1071 { 1072 /* Called as a result of removal from hash table */ 1073 struct ipoib_neigh *neigh = container_of(rp, struct ipoib_neigh, rcu); 1074 /* note TX context may hold another ref */ 1075 ipoib_neigh_put(neigh); 1076 } 1077 1078 void ipoib_neigh_free(struct ipoib_neigh *neigh) 1079 { 1080 struct net_device *dev = neigh->dev; 1081 struct ipoib_dev_priv *priv = netdev_priv(dev); 1082 struct ipoib_neigh_table *ntbl = &priv->ntbl; 1083 struct ipoib_neigh_hash *htbl; 1084 struct ipoib_neigh __rcu **np; 1085 struct ipoib_neigh *n; 1086 u32 hash_val; 1087 1088 htbl = rcu_dereference_protected(ntbl->htbl, 1089 lockdep_is_held(&priv->lock)); 1090 if (!htbl) 1091 return; 1092 1093 hash_val = ipoib_addr_hash(htbl, neigh->daddr); 1094 np = &htbl->buckets[hash_val]; 1095 for (n = rcu_dereference_protected(*np, 1096 lockdep_is_held(&priv->lock)); 1097 n != NULL; 1098 n = rcu_dereference_protected(*np, 1099 lockdep_is_held(&priv->lock))) { 1100 if (n == neigh) { 1101 /* found */ 1102 rcu_assign_pointer(*np, 1103 rcu_dereference_protected(neigh->hnext, 1104 lockdep_is_held(&priv->lock))); 1105 /* remove from parent list */ 1106 list_del(&neigh->list); 1107 call_rcu(&neigh->rcu, ipoib_neigh_reclaim); 1108 return; 1109 } else { 1110 np = &n->hnext; 1111 } 1112 } 1113 } 1114 1115 static int ipoib_neigh_hash_init(struct ipoib_dev_priv *priv) 1116 { 1117 struct ipoib_neigh_table *ntbl = &priv->ntbl; 1118 struct ipoib_neigh_hash *htbl; 1119 struct ipoib_neigh **buckets; 1120 u32 size; 1121 1122 clear_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags); 1123 ntbl->htbl = NULL; 1124 htbl = kzalloc(sizeof(*htbl), GFP_KERNEL); 1125 if (!htbl) 1126 return -ENOMEM; 1127 set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags); 1128 size = roundup_pow_of_two(arp_tbl.gc_thresh3); 1129 buckets = kzalloc(size * sizeof(*buckets), GFP_KERNEL); 1130 if (!buckets) { 1131 kfree(htbl); 1132 return -ENOMEM; 1133 } 1134 htbl->size = size; 1135 htbl->mask = (size - 1); 1136 htbl->buckets = buckets; 1137 ntbl->htbl = htbl; 1138 htbl->ntbl = ntbl; 1139 atomic_set(&ntbl->entries, 0); 1140 1141 /* start garbage collection */ 1142 clear_bit(IPOIB_STOP_NEIGH_GC, &priv->flags); 1143 queue_delayed_work(ipoib_workqueue, &priv->neigh_reap_task, 1144 arp_tbl.gc_interval); 1145 1146 return 0; 1147 } 1148 1149 static void neigh_hash_free_rcu(struct rcu_head *head) 1150 { 1151 struct ipoib_neigh_hash *htbl = container_of(head, 1152 struct ipoib_neigh_hash, 1153 rcu); 1154 struct ipoib_neigh __rcu **buckets = htbl->buckets; 1155 struct ipoib_neigh_table *ntbl = htbl->ntbl; 1156 1157 kfree(buckets); 1158 kfree(htbl); 1159 complete(&ntbl->deleted); 1160 } 1161 1162 void ipoib_del_neighs_by_gid(struct net_device *dev, u8 *gid) 1163 { 1164 struct ipoib_dev_priv *priv = netdev_priv(dev); 1165 struct ipoib_neigh_table *ntbl = &priv->ntbl; 1166 struct ipoib_neigh_hash *htbl; 1167 unsigned long flags; 1168 int i; 1169 1170 /* remove all neigh connected to a given path or mcast */ 1171 spin_lock_irqsave(&priv->lock, flags); 1172 1173 htbl = rcu_dereference_protected(ntbl->htbl, 1174 lockdep_is_held(&priv->lock)); 1175 1176 if (!htbl) 1177 goto out_unlock; 1178 1179 for (i = 0; i < htbl->size; i++) { 1180 struct ipoib_neigh *neigh; 1181 struct ipoib_neigh __rcu **np = &htbl->buckets[i]; 1182 1183 while ((neigh = rcu_dereference_protected(*np, 1184 lockdep_is_held(&priv->lock))) != NULL) { 1185 /* delete neighs belong to this parent */ 1186 if (!memcmp(gid, neigh->daddr + 4, sizeof (union ib_gid))) { 1187 rcu_assign_pointer(*np, 1188 rcu_dereference_protected(neigh->hnext, 1189 lockdep_is_held(&priv->lock))); 1190 /* remove from parent list */ 1191 list_del(&neigh->list); 1192 call_rcu(&neigh->rcu, ipoib_neigh_reclaim); 1193 } else { 1194 np = &neigh->hnext; 1195 } 1196 1197 } 1198 } 1199 out_unlock: 1200 spin_unlock_irqrestore(&priv->lock, flags); 1201 } 1202 1203 static void ipoib_flush_neighs(struct ipoib_dev_priv *priv) 1204 { 1205 struct ipoib_neigh_table *ntbl = &priv->ntbl; 1206 struct ipoib_neigh_hash *htbl; 1207 unsigned long flags; 1208 int i, wait_flushed = 0; 1209 1210 init_completion(&priv->ntbl.flushed); 1211 1212 spin_lock_irqsave(&priv->lock, flags); 1213 1214 htbl = rcu_dereference_protected(ntbl->htbl, 1215 lockdep_is_held(&priv->lock)); 1216 if (!htbl) 1217 goto out_unlock; 1218 1219 wait_flushed = atomic_read(&priv->ntbl.entries); 1220 if (!wait_flushed) 1221 goto free_htbl; 1222 1223 for (i = 0; i < htbl->size; i++) { 1224 struct ipoib_neigh *neigh; 1225 struct ipoib_neigh __rcu **np = &htbl->buckets[i]; 1226 1227 while ((neigh = rcu_dereference_protected(*np, 1228 lockdep_is_held(&priv->lock))) != NULL) { 1229 rcu_assign_pointer(*np, 1230 rcu_dereference_protected(neigh->hnext, 1231 lockdep_is_held(&priv->lock))); 1232 /* remove from path/mc list */ 1233 list_del(&neigh->list); 1234 call_rcu(&neigh->rcu, ipoib_neigh_reclaim); 1235 } 1236 } 1237 1238 free_htbl: 1239 rcu_assign_pointer(ntbl->htbl, NULL); 1240 call_rcu(&htbl->rcu, neigh_hash_free_rcu); 1241 1242 out_unlock: 1243 spin_unlock_irqrestore(&priv->lock, flags); 1244 if (wait_flushed) 1245 wait_for_completion(&priv->ntbl.flushed); 1246 } 1247 1248 static void ipoib_neigh_hash_uninit(struct net_device *dev) 1249 { 1250 struct ipoib_dev_priv *priv = netdev_priv(dev); 1251 int stopped; 1252 1253 ipoib_dbg(priv, "ipoib_neigh_hash_uninit\n"); 1254 init_completion(&priv->ntbl.deleted); 1255 set_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags); 1256 1257 /* Stop GC if called at init fail need to cancel work */ 1258 stopped = test_and_set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags); 1259 if (!stopped) 1260 cancel_delayed_work(&priv->neigh_reap_task); 1261 1262 ipoib_flush_neighs(priv); 1263 1264 wait_for_completion(&priv->ntbl.deleted); 1265 } 1266 1267 1268 int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port) 1269 { 1270 struct ipoib_dev_priv *priv = netdev_priv(dev); 1271 1272 if (ipoib_neigh_hash_init(priv) < 0) 1273 goto out; 1274 /* Allocate RX/TX "rings" to hold queued skbs */ 1275 priv->rx_ring = kzalloc(ipoib_recvq_size * sizeof *priv->rx_ring, 1276 GFP_KERNEL); 1277 if (!priv->rx_ring) { 1278 printk(KERN_WARNING "%s: failed to allocate RX ring (%d entries)\n", 1279 ca->name, ipoib_recvq_size); 1280 goto out_neigh_hash_cleanup; 1281 } 1282 1283 priv->tx_ring = vzalloc(ipoib_sendq_size * sizeof *priv->tx_ring); 1284 if (!priv->tx_ring) { 1285 printk(KERN_WARNING "%s: failed to allocate TX ring (%d entries)\n", 1286 ca->name, ipoib_sendq_size); 1287 goto out_rx_ring_cleanup; 1288 } 1289 1290 /* priv->tx_head, tx_tail & tx_outstanding are already 0 */ 1291 1292 if (ipoib_ib_dev_init(dev, ca, port)) 1293 goto out_tx_ring_cleanup; 1294 1295 return 0; 1296 1297 out_tx_ring_cleanup: 1298 vfree(priv->tx_ring); 1299 1300 out_rx_ring_cleanup: 1301 kfree(priv->rx_ring); 1302 1303 out_neigh_hash_cleanup: 1304 ipoib_neigh_hash_uninit(dev); 1305 out: 1306 return -ENOMEM; 1307 } 1308 1309 void ipoib_dev_cleanup(struct net_device *dev) 1310 { 1311 struct ipoib_dev_priv *priv = netdev_priv(dev), *cpriv, *tcpriv; 1312 LIST_HEAD(head); 1313 1314 ASSERT_RTNL(); 1315 1316 ipoib_delete_debug_files(dev); 1317 1318 /* Delete any child interfaces first */ 1319 list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) { 1320 /* Stop GC on child */ 1321 set_bit(IPOIB_STOP_NEIGH_GC, &cpriv->flags); 1322 cancel_delayed_work(&cpriv->neigh_reap_task); 1323 unregister_netdevice_queue(cpriv->dev, &head); 1324 } 1325 unregister_netdevice_many(&head); 1326 1327 ipoib_ib_dev_cleanup(dev); 1328 1329 kfree(priv->rx_ring); 1330 vfree(priv->tx_ring); 1331 1332 priv->rx_ring = NULL; 1333 priv->tx_ring = NULL; 1334 1335 ipoib_neigh_hash_uninit(dev); 1336 } 1337 1338 static const struct header_ops ipoib_header_ops = { 1339 .create = ipoib_hard_header, 1340 }; 1341 1342 static const struct net_device_ops ipoib_netdev_ops = { 1343 .ndo_uninit = ipoib_uninit, 1344 .ndo_open = ipoib_open, 1345 .ndo_stop = ipoib_stop, 1346 .ndo_change_mtu = ipoib_change_mtu, 1347 .ndo_fix_features = ipoib_fix_features, 1348 .ndo_start_xmit = ipoib_start_xmit, 1349 .ndo_tx_timeout = ipoib_timeout, 1350 .ndo_set_rx_mode = ipoib_set_mcast_list, 1351 .ndo_get_iflink = ipoib_get_iflink, 1352 }; 1353 1354 void ipoib_setup(struct net_device *dev) 1355 { 1356 struct ipoib_dev_priv *priv = netdev_priv(dev); 1357 1358 dev->netdev_ops = &ipoib_netdev_ops; 1359 dev->header_ops = &ipoib_header_ops; 1360 1361 ipoib_set_ethtool_ops(dev); 1362 1363 netif_napi_add(dev, &priv->napi, ipoib_poll, NAPI_POLL_WEIGHT); 1364 1365 dev->watchdog_timeo = HZ; 1366 1367 dev->flags |= IFF_BROADCAST | IFF_MULTICAST; 1368 1369 dev->hard_header_len = IPOIB_ENCAP_LEN; 1370 dev->addr_len = INFINIBAND_ALEN; 1371 dev->type = ARPHRD_INFINIBAND; 1372 dev->tx_queue_len = ipoib_sendq_size * 2; 1373 dev->features = (NETIF_F_VLAN_CHALLENGED | 1374 NETIF_F_HIGHDMA); 1375 netif_keep_dst(dev); 1376 1377 memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN); 1378 1379 priv->dev = dev; 1380 1381 spin_lock_init(&priv->lock); 1382 1383 init_rwsem(&priv->vlan_rwsem); 1384 1385 INIT_LIST_HEAD(&priv->path_list); 1386 INIT_LIST_HEAD(&priv->child_intfs); 1387 INIT_LIST_HEAD(&priv->dead_ahs); 1388 INIT_LIST_HEAD(&priv->multicast_list); 1389 1390 INIT_DELAYED_WORK(&priv->mcast_task, ipoib_mcast_join_task); 1391 INIT_WORK(&priv->carrier_on_task, ipoib_mcast_carrier_on_task); 1392 INIT_WORK(&priv->flush_light, ipoib_ib_dev_flush_light); 1393 INIT_WORK(&priv->flush_normal, ipoib_ib_dev_flush_normal); 1394 INIT_WORK(&priv->flush_heavy, ipoib_ib_dev_flush_heavy); 1395 INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task); 1396 INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah); 1397 INIT_DELAYED_WORK(&priv->neigh_reap_task, ipoib_reap_neigh); 1398 } 1399 1400 struct ipoib_dev_priv *ipoib_intf_alloc(const char *name) 1401 { 1402 struct net_device *dev; 1403 1404 dev = alloc_netdev((int)sizeof(struct ipoib_dev_priv), name, 1405 NET_NAME_UNKNOWN, ipoib_setup); 1406 if (!dev) 1407 return NULL; 1408 1409 return netdev_priv(dev); 1410 } 1411 1412 static ssize_t show_pkey(struct device *dev, 1413 struct device_attribute *attr, char *buf) 1414 { 1415 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev)); 1416 1417 return sprintf(buf, "0x%04x\n", priv->pkey); 1418 } 1419 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL); 1420 1421 static ssize_t show_umcast(struct device *dev, 1422 struct device_attribute *attr, char *buf) 1423 { 1424 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev)); 1425 1426 return sprintf(buf, "%d\n", test_bit(IPOIB_FLAG_UMCAST, &priv->flags)); 1427 } 1428 1429 void ipoib_set_umcast(struct net_device *ndev, int umcast_val) 1430 { 1431 struct ipoib_dev_priv *priv = netdev_priv(ndev); 1432 1433 if (umcast_val > 0) { 1434 set_bit(IPOIB_FLAG_UMCAST, &priv->flags); 1435 ipoib_warn(priv, "ignoring multicast groups joined directly " 1436 "by userspace\n"); 1437 } else 1438 clear_bit(IPOIB_FLAG_UMCAST, &priv->flags); 1439 } 1440 1441 static ssize_t set_umcast(struct device *dev, 1442 struct device_attribute *attr, 1443 const char *buf, size_t count) 1444 { 1445 unsigned long umcast_val = simple_strtoul(buf, NULL, 0); 1446 1447 ipoib_set_umcast(to_net_dev(dev), umcast_val); 1448 1449 return count; 1450 } 1451 static DEVICE_ATTR(umcast, S_IWUSR | S_IRUGO, show_umcast, set_umcast); 1452 1453 int ipoib_add_umcast_attr(struct net_device *dev) 1454 { 1455 return device_create_file(&dev->dev, &dev_attr_umcast); 1456 } 1457 1458 static ssize_t create_child(struct device *dev, 1459 struct device_attribute *attr, 1460 const char *buf, size_t count) 1461 { 1462 int pkey; 1463 int ret; 1464 1465 if (sscanf(buf, "%i", &pkey) != 1) 1466 return -EINVAL; 1467 1468 if (pkey <= 0 || pkey > 0xffff || pkey == 0x8000) 1469 return -EINVAL; 1470 1471 /* 1472 * Set the full membership bit, so that we join the right 1473 * broadcast group, etc. 1474 */ 1475 pkey |= 0x8000; 1476 1477 ret = ipoib_vlan_add(to_net_dev(dev), pkey); 1478 1479 return ret ? ret : count; 1480 } 1481 static DEVICE_ATTR(create_child, S_IWUSR, NULL, create_child); 1482 1483 static ssize_t delete_child(struct device *dev, 1484 struct device_attribute *attr, 1485 const char *buf, size_t count) 1486 { 1487 int pkey; 1488 int ret; 1489 1490 if (sscanf(buf, "%i", &pkey) != 1) 1491 return -EINVAL; 1492 1493 if (pkey < 0 || pkey > 0xffff) 1494 return -EINVAL; 1495 1496 ret = ipoib_vlan_delete(to_net_dev(dev), pkey); 1497 1498 return ret ? ret : count; 1499 1500 } 1501 static DEVICE_ATTR(delete_child, S_IWUSR, NULL, delete_child); 1502 1503 int ipoib_add_pkey_attr(struct net_device *dev) 1504 { 1505 return device_create_file(&dev->dev, &dev_attr_pkey); 1506 } 1507 1508 int ipoib_set_dev_features(struct ipoib_dev_priv *priv, struct ib_device *hca) 1509 { 1510 struct ib_device_attr *device_attr; 1511 int result = -ENOMEM; 1512 1513 device_attr = kmalloc(sizeof *device_attr, GFP_KERNEL); 1514 if (!device_attr) { 1515 printk(KERN_WARNING "%s: allocation of %zu bytes failed\n", 1516 hca->name, sizeof *device_attr); 1517 return result; 1518 } 1519 1520 result = ib_query_device(hca, device_attr); 1521 if (result) { 1522 printk(KERN_WARNING "%s: ib_query_device failed (ret = %d)\n", 1523 hca->name, result); 1524 kfree(device_attr); 1525 return result; 1526 } 1527 priv->hca_caps = device_attr->device_cap_flags; 1528 1529 kfree(device_attr); 1530 1531 if (priv->hca_caps & IB_DEVICE_UD_IP_CSUM) { 1532 priv->dev->hw_features = NETIF_F_SG | 1533 NETIF_F_IP_CSUM | NETIF_F_RXCSUM; 1534 1535 if (priv->hca_caps & IB_DEVICE_UD_TSO) 1536 priv->dev->hw_features |= NETIF_F_TSO; 1537 1538 priv->dev->features |= priv->dev->hw_features; 1539 } 1540 1541 return 0; 1542 } 1543 1544 static struct net_device *ipoib_add_port(const char *format, 1545 struct ib_device *hca, u8 port) 1546 { 1547 struct ipoib_dev_priv *priv; 1548 struct ib_port_attr attr; 1549 int result = -ENOMEM; 1550 1551 priv = ipoib_intf_alloc(format); 1552 if (!priv) 1553 goto alloc_mem_failed; 1554 1555 SET_NETDEV_DEV(priv->dev, hca->dma_device); 1556 priv->dev->dev_id = port - 1; 1557 1558 if (!ib_query_port(hca, port, &attr)) 1559 priv->max_ib_mtu = ib_mtu_enum_to_int(attr.max_mtu); 1560 else { 1561 printk(KERN_WARNING "%s: ib_query_port %d failed\n", 1562 hca->name, port); 1563 goto device_init_failed; 1564 } 1565 1566 /* MTU will be reset when mcast join happens */ 1567 priv->dev->mtu = IPOIB_UD_MTU(priv->max_ib_mtu); 1568 priv->mcast_mtu = priv->admin_mtu = priv->dev->mtu; 1569 1570 priv->dev->neigh_priv_len = sizeof(struct ipoib_neigh); 1571 1572 result = ib_query_pkey(hca, port, 0, &priv->pkey); 1573 if (result) { 1574 printk(KERN_WARNING "%s: ib_query_pkey port %d failed (ret = %d)\n", 1575 hca->name, port, result); 1576 goto device_init_failed; 1577 } 1578 1579 if (ipoib_set_dev_features(priv, hca)) 1580 goto device_init_failed; 1581 1582 /* 1583 * Set the full membership bit, so that we join the right 1584 * broadcast group, etc. 1585 */ 1586 priv->pkey |= 0x8000; 1587 1588 priv->dev->broadcast[8] = priv->pkey >> 8; 1589 priv->dev->broadcast[9] = priv->pkey & 0xff; 1590 1591 result = ib_query_gid(hca, port, 0, &priv->local_gid); 1592 if (result) { 1593 printk(KERN_WARNING "%s: ib_query_gid port %d failed (ret = %d)\n", 1594 hca->name, port, result); 1595 goto device_init_failed; 1596 } else 1597 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid)); 1598 1599 result = ipoib_dev_init(priv->dev, hca, port); 1600 if (result < 0) { 1601 printk(KERN_WARNING "%s: failed to initialize port %d (ret = %d)\n", 1602 hca->name, port, result); 1603 goto device_init_failed; 1604 } 1605 1606 INIT_IB_EVENT_HANDLER(&priv->event_handler, 1607 priv->ca, ipoib_event); 1608 result = ib_register_event_handler(&priv->event_handler); 1609 if (result < 0) { 1610 printk(KERN_WARNING "%s: ib_register_event_handler failed for " 1611 "port %d (ret = %d)\n", 1612 hca->name, port, result); 1613 goto event_failed; 1614 } 1615 1616 result = register_netdev(priv->dev); 1617 if (result) { 1618 printk(KERN_WARNING "%s: couldn't register ipoib port %d; error %d\n", 1619 hca->name, port, result); 1620 goto register_failed; 1621 } 1622 1623 ipoib_create_debug_files(priv->dev); 1624 1625 if (ipoib_cm_add_mode_attr(priv->dev)) 1626 goto sysfs_failed; 1627 if (ipoib_add_pkey_attr(priv->dev)) 1628 goto sysfs_failed; 1629 if (ipoib_add_umcast_attr(priv->dev)) 1630 goto sysfs_failed; 1631 if (device_create_file(&priv->dev->dev, &dev_attr_create_child)) 1632 goto sysfs_failed; 1633 if (device_create_file(&priv->dev->dev, &dev_attr_delete_child)) 1634 goto sysfs_failed; 1635 1636 return priv->dev; 1637 1638 sysfs_failed: 1639 ipoib_delete_debug_files(priv->dev); 1640 unregister_netdev(priv->dev); 1641 1642 register_failed: 1643 ib_unregister_event_handler(&priv->event_handler); 1644 /* Stop GC if started before flush */ 1645 set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags); 1646 cancel_delayed_work(&priv->neigh_reap_task); 1647 flush_workqueue(ipoib_workqueue); 1648 1649 event_failed: 1650 ipoib_dev_cleanup(priv->dev); 1651 1652 device_init_failed: 1653 free_netdev(priv->dev); 1654 1655 alloc_mem_failed: 1656 return ERR_PTR(result); 1657 } 1658 1659 static void ipoib_add_one(struct ib_device *device) 1660 { 1661 struct list_head *dev_list; 1662 struct net_device *dev; 1663 struct ipoib_dev_priv *priv; 1664 int s, e, p; 1665 1666 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB) 1667 return; 1668 1669 dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL); 1670 if (!dev_list) 1671 return; 1672 1673 INIT_LIST_HEAD(dev_list); 1674 1675 if (device->node_type == RDMA_NODE_IB_SWITCH) { 1676 s = 0; 1677 e = 0; 1678 } else { 1679 s = 1; 1680 e = device->phys_port_cnt; 1681 } 1682 1683 for (p = s; p <= e; ++p) { 1684 if (rdma_port_get_link_layer(device, p) != IB_LINK_LAYER_INFINIBAND) 1685 continue; 1686 dev = ipoib_add_port("ib%d", device, p); 1687 if (!IS_ERR(dev)) { 1688 priv = netdev_priv(dev); 1689 list_add_tail(&priv->list, dev_list); 1690 } 1691 } 1692 1693 ib_set_client_data(device, &ipoib_client, dev_list); 1694 } 1695 1696 static void ipoib_remove_one(struct ib_device *device) 1697 { 1698 struct ipoib_dev_priv *priv, *tmp; 1699 struct list_head *dev_list; 1700 1701 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB) 1702 return; 1703 1704 dev_list = ib_get_client_data(device, &ipoib_client); 1705 if (!dev_list) 1706 return; 1707 1708 list_for_each_entry_safe(priv, tmp, dev_list, list) { 1709 ib_unregister_event_handler(&priv->event_handler); 1710 1711 rtnl_lock(); 1712 dev_change_flags(priv->dev, priv->dev->flags & ~IFF_UP); 1713 rtnl_unlock(); 1714 1715 /* Stop GC */ 1716 set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags); 1717 cancel_delayed_work(&priv->neigh_reap_task); 1718 flush_workqueue(ipoib_workqueue); 1719 1720 unregister_netdev(priv->dev); 1721 free_netdev(priv->dev); 1722 } 1723 1724 kfree(dev_list); 1725 } 1726 1727 static int __init ipoib_init_module(void) 1728 { 1729 int ret; 1730 1731 ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size); 1732 ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE); 1733 ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE); 1734 1735 ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size); 1736 ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE); 1737 ipoib_sendq_size = max3(ipoib_sendq_size, 2 * MAX_SEND_CQE, IPOIB_MIN_QUEUE_SIZE); 1738 #ifdef CONFIG_INFINIBAND_IPOIB_CM 1739 ipoib_max_conn_qp = min(ipoib_max_conn_qp, IPOIB_CM_MAX_CONN_QP); 1740 #endif 1741 1742 /* 1743 * When copying small received packets, we only copy from the 1744 * linear data part of the SKB, so we rely on this condition. 1745 */ 1746 BUILD_BUG_ON(IPOIB_CM_COPYBREAK > IPOIB_CM_HEAD_SIZE); 1747 1748 ret = ipoib_register_debugfs(); 1749 if (ret) 1750 return ret; 1751 1752 /* 1753 * We create our own workqueue mainly because we want to be 1754 * able to flush it when devices are being removed. We can't 1755 * use schedule_work()/flush_scheduled_work() because both 1756 * unregister_netdev() and linkwatch_event take the rtnl lock, 1757 * so flush_scheduled_work() can deadlock during device 1758 * removal. 1759 */ 1760 ipoib_workqueue = create_singlethread_workqueue("ipoib"); 1761 if (!ipoib_workqueue) { 1762 ret = -ENOMEM; 1763 goto err_fs; 1764 } 1765 1766 ib_sa_register_client(&ipoib_sa_client); 1767 1768 ret = ib_register_client(&ipoib_client); 1769 if (ret) 1770 goto err_sa; 1771 1772 ret = ipoib_netlink_init(); 1773 if (ret) 1774 goto err_client; 1775 1776 return 0; 1777 1778 err_client: 1779 ib_unregister_client(&ipoib_client); 1780 1781 err_sa: 1782 ib_sa_unregister_client(&ipoib_sa_client); 1783 destroy_workqueue(ipoib_workqueue); 1784 1785 err_fs: 1786 ipoib_unregister_debugfs(); 1787 1788 return ret; 1789 } 1790 1791 static void __exit ipoib_cleanup_module(void) 1792 { 1793 ipoib_netlink_fini(); 1794 ib_unregister_client(&ipoib_client); 1795 ib_sa_unregister_client(&ipoib_sa_client); 1796 ipoib_unregister_debugfs(); 1797 destroy_workqueue(ipoib_workqueue); 1798 } 1799 1800 module_init(ipoib_init_module); 1801 module_exit(ipoib_cleanup_module); 1802