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 54const char ipoib_driver_version[] = DRV_VERSION; 55 56MODULE_AUTHOR("Roland Dreier"); 57MODULE_DESCRIPTION("IP-over-InfiniBand net driver"); 58MODULE_LICENSE("Dual BSD/GPL"); 59MODULE_VERSION(DRV_VERSION); 60 61int ipoib_sendq_size __read_mostly = IPOIB_TX_RING_SIZE; 62int ipoib_recvq_size __read_mostly = IPOIB_RX_RING_SIZE; 63 64module_param_named(send_queue_size, ipoib_sendq_size, int, 0444); 65MODULE_PARM_DESC(send_queue_size, "Number of descriptors in send queue"); 66module_param_named(recv_queue_size, ipoib_recvq_size, int, 0444); 67MODULE_PARM_DESC(recv_queue_size, "Number of descriptors in receive queue"); 68 69#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG 70int ipoib_debug_level; 71 72module_param_named(debug_level, ipoib_debug_level, int, 0644); 73MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0"); 74#endif 75 76struct ipoib_path_iter { 77 struct net_device *dev; 78 struct ipoib_path path; 79}; 80 81static 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 87struct workqueue_struct *ipoib_workqueue; 88 89struct ib_sa_client ipoib_sa_client; 90 91static void ipoib_add_one(struct ib_device *device); 92static void ipoib_remove_one(struct ib_device *device); 93static void ipoib_neigh_reclaim(struct rcu_head *rp); 94 95static struct ib_client ipoib_client = { 96 .name = "ipoib", 97 .add = ipoib_add_one, 98 .remove = ipoib_remove_one 99}; 100 101int 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)) { 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 141err_stop: 142 ipoib_ib_dev_stop(dev); 143 144err_disable: 145 clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags); 146 147 return -EINVAL; 148} 149 150static 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); 161 ipoib_ib_dev_stop(dev); 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 183static void ipoib_uninit(struct net_device *dev) 184{ 185 ipoib_dev_cleanup(dev); 186} 187 188static 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 198static 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 225int 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 256static 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 280static 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 310static 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 330struct 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 349int 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 378void 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 386void 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 403void 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 433static 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 528static 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 555static 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 586static 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 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) 644 __skb_queue_tail(&neigh->queue, skb); 645 else 646 goto err_drop; 647 } 648 649 spin_unlock_irqrestore(&priv->lock, flags); 650 ipoib_neigh_put(neigh); 651 return; 652 653err_path: 654 ipoib_neigh_free(neigh); 655err_drop: 656 ++dev->stats.tx_dropped; 657 dev_kfree_skb_any(skb); 658 659 spin_unlock_irqrestore(&priv->lock, flags); 660 ipoib_neigh_put(neigh); 661} 662 663static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev, 664 struct ipoib_cb *cb) 665{ 666 struct ipoib_dev_priv *priv = netdev_priv(dev); 667 struct ipoib_path *path; 668 unsigned long flags; 669 670 spin_lock_irqsave(&priv->lock, flags); 671 672 path = __path_find(dev, cb->hwaddr + 4); 673 if (!path || !path->valid) { 674 int new_path = 0; 675 676 if (!path) { 677 path = path_rec_create(dev, cb->hwaddr + 4); 678 new_path = 1; 679 } 680 if (path) { 681 if (skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) { 682 __skb_queue_tail(&path->queue, skb); 683 } else { 684 ++dev->stats.tx_dropped; 685 dev_kfree_skb_any(skb); 686 } 687 688 if (!path->query && path_rec_start(dev, path)) { 689 spin_unlock_irqrestore(&priv->lock, flags); 690 if (new_path) 691 path_free(dev, path); 692 return; 693 } else 694 __path_add(dev, path); 695 } else { 696 ++dev->stats.tx_dropped; 697 dev_kfree_skb_any(skb); 698 } 699 700 spin_unlock_irqrestore(&priv->lock, flags); 701 return; 702 } 703 704 if (path->ah) { 705 ipoib_dbg(priv, "Send unicast ARP to %04x\n", 706 be16_to_cpu(path->pathrec.dlid)); 707 708 spin_unlock_irqrestore(&priv->lock, flags); 709 ipoib_send(dev, skb, path->ah, IPOIB_QPN(cb->hwaddr)); 710 return; 711 } else if ((path->query || !path_rec_start(dev, path)) && 712 skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) { 713 __skb_queue_tail(&path->queue, skb); 714 } else { 715 ++dev->stats.tx_dropped; 716 dev_kfree_skb_any(skb); 717 } 718 719 spin_unlock_irqrestore(&priv->lock, flags); 720} 721 722static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev) 723{ 724 struct ipoib_dev_priv *priv = netdev_priv(dev); 725 struct ipoib_neigh *neigh; 726 struct ipoib_cb *cb = ipoib_skb_cb(skb); 727 struct ipoib_header *header; 728 unsigned long flags; 729 730 header = (struct ipoib_header *) skb->data; 731 732 if (unlikely(cb->hwaddr[4] == 0xff)) { 733 /* multicast, arrange "if" according to probability */ 734 if ((header->proto != htons(ETH_P_IP)) && 735 (header->proto != htons(ETH_P_IPV6)) && 736 (header->proto != htons(ETH_P_ARP)) && 737 (header->proto != htons(ETH_P_RARP)) && 738 (header->proto != htons(ETH_P_TIPC))) { 739 /* ethertype not supported by IPoIB */ 740 ++dev->stats.tx_dropped; 741 dev_kfree_skb_any(skb); 742 return NETDEV_TX_OK; 743 } 744 /* Add in the P_Key for multicast*/ 745 cb->hwaddr[8] = (priv->pkey >> 8) & 0xff; 746 cb->hwaddr[9] = priv->pkey & 0xff; 747 748 neigh = ipoib_neigh_get(dev, cb->hwaddr); 749 if (likely(neigh)) 750 goto send_using_neigh; 751 ipoib_mcast_send(dev, cb->hwaddr, skb); 752 return NETDEV_TX_OK; 753 } 754 755 /* unicast, arrange "switch" according to probability */ 756 switch (header->proto) { 757 case htons(ETH_P_IP): 758 case htons(ETH_P_IPV6): 759 case htons(ETH_P_TIPC): 760 neigh = ipoib_neigh_get(dev, cb->hwaddr); 761 if (unlikely(!neigh)) { 762 neigh_add_path(skb, cb->hwaddr, dev); 763 return NETDEV_TX_OK; 764 } 765 break; 766 case htons(ETH_P_ARP): 767 case htons(ETH_P_RARP): 768 /* for unicast ARP and RARP should always perform path find */ 769 unicast_arp_send(skb, dev, cb); 770 return NETDEV_TX_OK; 771 default: 772 /* ethertype not supported by IPoIB */ 773 ++dev->stats.tx_dropped; 774 dev_kfree_skb_any(skb); 775 return NETDEV_TX_OK; 776 } 777 778send_using_neigh: 779 /* note we now hold a ref to neigh */ 780 if (ipoib_cm_get(neigh)) { 781 if (ipoib_cm_up(neigh)) { 782 ipoib_cm_send(dev, skb, ipoib_cm_get(neigh)); 783 goto unref; 784 } 785 } else if (neigh->ah) { 786 ipoib_send(dev, skb, neigh->ah, IPOIB_QPN(cb->hwaddr)); 787 goto unref; 788 } 789 790 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) { 791 spin_lock_irqsave(&priv->lock, flags); 792 __skb_queue_tail(&neigh->queue, skb); 793 spin_unlock_irqrestore(&priv->lock, flags); 794 } else { 795 ++dev->stats.tx_dropped; 796 dev_kfree_skb_any(skb); 797 } 798 799unref: 800 ipoib_neigh_put(neigh); 801 802 return NETDEV_TX_OK; 803} 804 805static void ipoib_timeout(struct net_device *dev) 806{ 807 struct ipoib_dev_priv *priv = netdev_priv(dev); 808 809 ipoib_warn(priv, "transmit timeout: latency %d msecs\n", 810 jiffies_to_msecs(jiffies - dev->trans_start)); 811 ipoib_warn(priv, "queue stopped %d, tx_head %u, tx_tail %u\n", 812 netif_queue_stopped(dev), 813 priv->tx_head, priv->tx_tail); 814 /* XXX reset QP, etc. */ 815} 816 817static int ipoib_hard_header(struct sk_buff *skb, 818 struct net_device *dev, 819 unsigned short type, 820 const void *daddr, const void *saddr, unsigned len) 821{ 822 struct ipoib_header *header; 823 struct ipoib_cb *cb = ipoib_skb_cb(skb); 824 825 header = (struct ipoib_header *) skb_push(skb, sizeof *header); 826 827 header->proto = htons(type); 828 header->reserved = 0; 829 830 /* 831 * we don't rely on dst_entry structure, always stuff the 832 * destination address into skb->cb so we can figure out where 833 * to send the packet later. 834 */ 835 memcpy(cb->hwaddr, daddr, INFINIBAND_ALEN); 836 837 return sizeof *header; 838} 839 840static void ipoib_set_mcast_list(struct net_device *dev) 841{ 842 struct ipoib_dev_priv *priv = netdev_priv(dev); 843 844 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) { 845 ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set"); 846 return; 847 } 848 849 queue_work(priv->wq, &priv->restart_task); 850} 851 852static int ipoib_get_iflink(const struct net_device *dev) 853{ 854 struct ipoib_dev_priv *priv = netdev_priv(dev); 855 856 /* parent interface */ 857 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) 858 return dev->ifindex; 859 860 /* child/vlan interface */ 861 return priv->parent->ifindex; 862} 863 864static u32 ipoib_addr_hash(struct ipoib_neigh_hash *htbl, u8 *daddr) 865{ 866 /* 867 * Use only the address parts that contributes to spreading 868 * The subnet prefix is not used as one can not connect to 869 * same remote port (GUID) using the same remote QPN via two 870 * different subnets. 871 */ 872 /* qpn octets[1:4) & port GUID octets[12:20) */ 873 u32 *d32 = (u32 *) daddr; 874 u32 hv; 875 876 hv = jhash_3words(d32[3], d32[4], IPOIB_QPN_MASK & d32[0], 0); 877 return hv & htbl->mask; 878} 879 880struct ipoib_neigh *ipoib_neigh_get(struct net_device *dev, u8 *daddr) 881{ 882 struct ipoib_dev_priv *priv = netdev_priv(dev); 883 struct ipoib_neigh_table *ntbl = &priv->ntbl; 884 struct ipoib_neigh_hash *htbl; 885 struct ipoib_neigh *neigh = NULL; 886 u32 hash_val; 887 888 rcu_read_lock_bh(); 889 890 htbl = rcu_dereference_bh(ntbl->htbl); 891 892 if (!htbl) 893 goto out_unlock; 894 895 hash_val = ipoib_addr_hash(htbl, daddr); 896 for (neigh = rcu_dereference_bh(htbl->buckets[hash_val]); 897 neigh != NULL; 898 neigh = rcu_dereference_bh(neigh->hnext)) { 899 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) { 900 /* found, take one ref on behalf of the caller */ 901 if (!atomic_inc_not_zero(&neigh->refcnt)) { 902 /* deleted */ 903 neigh = NULL; 904 goto out_unlock; 905 } 906 neigh->alive = jiffies; 907 goto out_unlock; 908 } 909 } 910 911out_unlock: 912 rcu_read_unlock_bh(); 913 return neigh; 914} 915 916static void __ipoib_reap_neigh(struct ipoib_dev_priv *priv) 917{ 918 struct ipoib_neigh_table *ntbl = &priv->ntbl; 919 struct ipoib_neigh_hash *htbl; 920 unsigned long neigh_obsolete; 921 unsigned long dt; 922 unsigned long flags; 923 int i; 924 925 if (test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags)) 926 return; 927 928 spin_lock_irqsave(&priv->lock, flags); 929 930 htbl = rcu_dereference_protected(ntbl->htbl, 931 lockdep_is_held(&priv->lock)); 932 933 if (!htbl) 934 goto out_unlock; 935 936 /* neigh is obsolete if it was idle for two GC periods */ 937 dt = 2 * arp_tbl.gc_interval; 938 neigh_obsolete = jiffies - dt; 939 /* handle possible race condition */ 940 if (test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags)) 941 goto out_unlock; 942 943 for (i = 0; i < htbl->size; i++) { 944 struct ipoib_neigh *neigh; 945 struct ipoib_neigh __rcu **np = &htbl->buckets[i]; 946 947 while ((neigh = rcu_dereference_protected(*np, 948 lockdep_is_held(&priv->lock))) != NULL) { 949 /* was the neigh idle for two GC periods */ 950 if (time_after(neigh_obsolete, neigh->alive)) { 951 rcu_assign_pointer(*np, 952 rcu_dereference_protected(neigh->hnext, 953 lockdep_is_held(&priv->lock))); 954 /* remove from path/mc list */ 955 list_del(&neigh->list); 956 call_rcu(&neigh->rcu, ipoib_neigh_reclaim); 957 } else { 958 np = &neigh->hnext; 959 } 960 961 } 962 } 963 964out_unlock: 965 spin_unlock_irqrestore(&priv->lock, flags); 966} 967 968static void ipoib_reap_neigh(struct work_struct *work) 969{ 970 struct ipoib_dev_priv *priv = 971 container_of(work, struct ipoib_dev_priv, neigh_reap_task.work); 972 973 __ipoib_reap_neigh(priv); 974 975 if (!test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags)) 976 queue_delayed_work(priv->wq, &priv->neigh_reap_task, 977 arp_tbl.gc_interval); 978} 979 980 981static struct ipoib_neigh *ipoib_neigh_ctor(u8 *daddr, 982 struct net_device *dev) 983{ 984 struct ipoib_neigh *neigh; 985 986 neigh = kzalloc(sizeof *neigh, GFP_ATOMIC); 987 if (!neigh) 988 return NULL; 989 990 neigh->dev = dev; 991 memcpy(&neigh->daddr, daddr, sizeof(neigh->daddr)); 992 skb_queue_head_init(&neigh->queue); 993 INIT_LIST_HEAD(&neigh->list); 994 ipoib_cm_set(neigh, NULL); 995 /* one ref on behalf of the caller */ 996 atomic_set(&neigh->refcnt, 1); 997 998 return neigh; 999} 1000 1001struct ipoib_neigh *ipoib_neigh_alloc(u8 *daddr, 1002 struct net_device *dev) 1003{ 1004 struct ipoib_dev_priv *priv = netdev_priv(dev); 1005 struct ipoib_neigh_table *ntbl = &priv->ntbl; 1006 struct ipoib_neigh_hash *htbl; 1007 struct ipoib_neigh *neigh; 1008 u32 hash_val; 1009 1010 htbl = rcu_dereference_protected(ntbl->htbl, 1011 lockdep_is_held(&priv->lock)); 1012 if (!htbl) { 1013 neigh = NULL; 1014 goto out_unlock; 1015 } 1016 1017 /* need to add a new neigh, but maybe some other thread succeeded? 1018 * recalc hash, maybe hash resize took place so we do a search 1019 */ 1020 hash_val = ipoib_addr_hash(htbl, daddr); 1021 for (neigh = rcu_dereference_protected(htbl->buckets[hash_val], 1022 lockdep_is_held(&priv->lock)); 1023 neigh != NULL; 1024 neigh = rcu_dereference_protected(neigh->hnext, 1025 lockdep_is_held(&priv->lock))) { 1026 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) { 1027 /* found, take one ref on behalf of the caller */ 1028 if (!atomic_inc_not_zero(&neigh->refcnt)) { 1029 /* deleted */ 1030 neigh = NULL; 1031 break; 1032 } 1033 neigh->alive = jiffies; 1034 goto out_unlock; 1035 } 1036 } 1037 1038 neigh = ipoib_neigh_ctor(daddr, dev); 1039 if (!neigh) 1040 goto out_unlock; 1041 1042 /* one ref on behalf of the hash table */ 1043 atomic_inc(&neigh->refcnt); 1044 neigh->alive = jiffies; 1045 /* put in hash */ 1046 rcu_assign_pointer(neigh->hnext, 1047 rcu_dereference_protected(htbl->buckets[hash_val], 1048 lockdep_is_held(&priv->lock))); 1049 rcu_assign_pointer(htbl->buckets[hash_val], neigh); 1050 atomic_inc(&ntbl->entries); 1051 1052out_unlock: 1053 1054 return neigh; 1055} 1056 1057void ipoib_neigh_dtor(struct ipoib_neigh *neigh) 1058{ 1059 /* neigh reference count was dropprd to zero */ 1060 struct net_device *dev = neigh->dev; 1061 struct ipoib_dev_priv *priv = netdev_priv(dev); 1062 struct sk_buff *skb; 1063 if (neigh->ah) 1064 ipoib_put_ah(neigh->ah); 1065 while ((skb = __skb_dequeue(&neigh->queue))) { 1066 ++dev->stats.tx_dropped; 1067 dev_kfree_skb_any(skb); 1068 } 1069 if (ipoib_cm_get(neigh)) 1070 ipoib_cm_destroy_tx(ipoib_cm_get(neigh)); 1071 ipoib_dbg(netdev_priv(dev), 1072 "neigh free for %06x %pI6\n", 1073 IPOIB_QPN(neigh->daddr), 1074 neigh->daddr + 4); 1075 kfree(neigh); 1076 if (atomic_dec_and_test(&priv->ntbl.entries)) { 1077 if (test_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags)) 1078 complete(&priv->ntbl.flushed); 1079 } 1080} 1081 1082static void ipoib_neigh_reclaim(struct rcu_head *rp) 1083{ 1084 /* Called as a result of removal from hash table */ 1085 struct ipoib_neigh *neigh = container_of(rp, struct ipoib_neigh, rcu); 1086 /* note TX context may hold another ref */ 1087 ipoib_neigh_put(neigh); 1088} 1089 1090void ipoib_neigh_free(struct ipoib_neigh *neigh) 1091{ 1092 struct net_device *dev = neigh->dev; 1093 struct ipoib_dev_priv *priv = netdev_priv(dev); 1094 struct ipoib_neigh_table *ntbl = &priv->ntbl; 1095 struct ipoib_neigh_hash *htbl; 1096 struct ipoib_neigh __rcu **np; 1097 struct ipoib_neigh *n; 1098 u32 hash_val; 1099 1100 htbl = rcu_dereference_protected(ntbl->htbl, 1101 lockdep_is_held(&priv->lock)); 1102 if (!htbl) 1103 return; 1104 1105 hash_val = ipoib_addr_hash(htbl, neigh->daddr); 1106 np = &htbl->buckets[hash_val]; 1107 for (n = rcu_dereference_protected(*np, 1108 lockdep_is_held(&priv->lock)); 1109 n != NULL; 1110 n = rcu_dereference_protected(*np, 1111 lockdep_is_held(&priv->lock))) { 1112 if (n == neigh) { 1113 /* found */ 1114 rcu_assign_pointer(*np, 1115 rcu_dereference_protected(neigh->hnext, 1116 lockdep_is_held(&priv->lock))); 1117 /* remove from parent list */ 1118 list_del(&neigh->list); 1119 call_rcu(&neigh->rcu, ipoib_neigh_reclaim); 1120 return; 1121 } else { 1122 np = &n->hnext; 1123 } 1124 } 1125} 1126 1127static int ipoib_neigh_hash_init(struct ipoib_dev_priv *priv) 1128{ 1129 struct ipoib_neigh_table *ntbl = &priv->ntbl; 1130 struct ipoib_neigh_hash *htbl; 1131 struct ipoib_neigh **buckets; 1132 u32 size; 1133 1134 clear_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags); 1135 ntbl->htbl = NULL; 1136 htbl = kzalloc(sizeof(*htbl), GFP_KERNEL); 1137 if (!htbl) 1138 return -ENOMEM; 1139 set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags); 1140 size = roundup_pow_of_two(arp_tbl.gc_thresh3); 1141 buckets = kzalloc(size * sizeof(*buckets), GFP_KERNEL); 1142 if (!buckets) { 1143 kfree(htbl); 1144 return -ENOMEM; 1145 } 1146 htbl->size = size; 1147 htbl->mask = (size - 1); 1148 htbl->buckets = buckets; 1149 ntbl->htbl = htbl; 1150 htbl->ntbl = ntbl; 1151 atomic_set(&ntbl->entries, 0); 1152 1153 /* start garbage collection */ 1154 clear_bit(IPOIB_STOP_NEIGH_GC, &priv->flags); 1155 queue_delayed_work(priv->wq, &priv->neigh_reap_task, 1156 arp_tbl.gc_interval); 1157 1158 return 0; 1159} 1160 1161static void neigh_hash_free_rcu(struct rcu_head *head) 1162{ 1163 struct ipoib_neigh_hash *htbl = container_of(head, 1164 struct ipoib_neigh_hash, 1165 rcu); 1166 struct ipoib_neigh __rcu **buckets = htbl->buckets; 1167 struct ipoib_neigh_table *ntbl = htbl->ntbl; 1168 1169 kfree(buckets); 1170 kfree(htbl); 1171 complete(&ntbl->deleted); 1172} 1173 1174void ipoib_del_neighs_by_gid(struct net_device *dev, u8 *gid) 1175{ 1176 struct ipoib_dev_priv *priv = netdev_priv(dev); 1177 struct ipoib_neigh_table *ntbl = &priv->ntbl; 1178 struct ipoib_neigh_hash *htbl; 1179 unsigned long flags; 1180 int i; 1181 1182 /* remove all neigh connected to a given path or mcast */ 1183 spin_lock_irqsave(&priv->lock, flags); 1184 1185 htbl = rcu_dereference_protected(ntbl->htbl, 1186 lockdep_is_held(&priv->lock)); 1187 1188 if (!htbl) 1189 goto out_unlock; 1190 1191 for (i = 0; i < htbl->size; i++) { 1192 struct ipoib_neigh *neigh; 1193 struct ipoib_neigh __rcu **np = &htbl->buckets[i]; 1194 1195 while ((neigh = rcu_dereference_protected(*np, 1196 lockdep_is_held(&priv->lock))) != NULL) { 1197 /* delete neighs belong to this parent */ 1198 if (!memcmp(gid, neigh->daddr + 4, sizeof (union ib_gid))) { 1199 rcu_assign_pointer(*np, 1200 rcu_dereference_protected(neigh->hnext, 1201 lockdep_is_held(&priv->lock))); 1202 /* remove from parent list */ 1203 list_del(&neigh->list); 1204 call_rcu(&neigh->rcu, ipoib_neigh_reclaim); 1205 } else { 1206 np = &neigh->hnext; 1207 } 1208 1209 } 1210 } 1211out_unlock: 1212 spin_unlock_irqrestore(&priv->lock, flags); 1213} 1214 1215static void ipoib_flush_neighs(struct ipoib_dev_priv *priv) 1216{ 1217 struct ipoib_neigh_table *ntbl = &priv->ntbl; 1218 struct ipoib_neigh_hash *htbl; 1219 unsigned long flags; 1220 int i, wait_flushed = 0; 1221 1222 init_completion(&priv->ntbl.flushed); 1223 1224 spin_lock_irqsave(&priv->lock, flags); 1225 1226 htbl = rcu_dereference_protected(ntbl->htbl, 1227 lockdep_is_held(&priv->lock)); 1228 if (!htbl) 1229 goto out_unlock; 1230 1231 wait_flushed = atomic_read(&priv->ntbl.entries); 1232 if (!wait_flushed) 1233 goto free_htbl; 1234 1235 for (i = 0; i < htbl->size; i++) { 1236 struct ipoib_neigh *neigh; 1237 struct ipoib_neigh __rcu **np = &htbl->buckets[i]; 1238 1239 while ((neigh = rcu_dereference_protected(*np, 1240 lockdep_is_held(&priv->lock))) != NULL) { 1241 rcu_assign_pointer(*np, 1242 rcu_dereference_protected(neigh->hnext, 1243 lockdep_is_held(&priv->lock))); 1244 /* remove from path/mc list */ 1245 list_del(&neigh->list); 1246 call_rcu(&neigh->rcu, ipoib_neigh_reclaim); 1247 } 1248 } 1249 1250free_htbl: 1251 rcu_assign_pointer(ntbl->htbl, NULL); 1252 call_rcu(&htbl->rcu, neigh_hash_free_rcu); 1253 1254out_unlock: 1255 spin_unlock_irqrestore(&priv->lock, flags); 1256 if (wait_flushed) 1257 wait_for_completion(&priv->ntbl.flushed); 1258} 1259 1260static void ipoib_neigh_hash_uninit(struct net_device *dev) 1261{ 1262 struct ipoib_dev_priv *priv = netdev_priv(dev); 1263 int stopped; 1264 1265 ipoib_dbg(priv, "ipoib_neigh_hash_uninit\n"); 1266 init_completion(&priv->ntbl.deleted); 1267 set_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags); 1268 1269 /* Stop GC if called at init fail need to cancel work */ 1270 stopped = test_and_set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags); 1271 if (!stopped) 1272 cancel_delayed_work(&priv->neigh_reap_task); 1273 1274 ipoib_flush_neighs(priv); 1275 1276 wait_for_completion(&priv->ntbl.deleted); 1277} 1278 1279 1280int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port) 1281{ 1282 struct ipoib_dev_priv *priv = netdev_priv(dev); 1283 1284 /* Allocate RX/TX "rings" to hold queued skbs */ 1285 priv->rx_ring = kzalloc(ipoib_recvq_size * sizeof *priv->rx_ring, 1286 GFP_KERNEL); 1287 if (!priv->rx_ring) { 1288 printk(KERN_WARNING "%s: failed to allocate RX ring (%d entries)\n", 1289 ca->name, ipoib_recvq_size); 1290 goto out; 1291 } 1292 1293 priv->tx_ring = vzalloc(ipoib_sendq_size * sizeof *priv->tx_ring); 1294 if (!priv->tx_ring) { 1295 printk(KERN_WARNING "%s: failed to allocate TX ring (%d entries)\n", 1296 ca->name, ipoib_sendq_size); 1297 goto out_rx_ring_cleanup; 1298 } 1299 1300 /* priv->tx_head, tx_tail & tx_outstanding are already 0 */ 1301 1302 if (ipoib_ib_dev_init(dev, ca, port)) 1303 goto out_tx_ring_cleanup; 1304 1305 /* 1306 * Must be after ipoib_ib_dev_init so we can allocate a per 1307 * device wq there and use it here 1308 */ 1309 if (ipoib_neigh_hash_init(priv) < 0) 1310 goto out_dev_uninit; 1311 1312 return 0; 1313 1314out_dev_uninit: 1315 ipoib_ib_dev_cleanup(dev); 1316 1317out_tx_ring_cleanup: 1318 vfree(priv->tx_ring); 1319 1320out_rx_ring_cleanup: 1321 kfree(priv->rx_ring); 1322 1323out: 1324 return -ENOMEM; 1325} 1326 1327void ipoib_dev_cleanup(struct net_device *dev) 1328{ 1329 struct ipoib_dev_priv *priv = netdev_priv(dev), *cpriv, *tcpriv; 1330 LIST_HEAD(head); 1331 1332 ASSERT_RTNL(); 1333 1334 ipoib_delete_debug_files(dev); 1335 1336 /* Delete any child interfaces first */ 1337 list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) { 1338 /* Stop GC on child */ 1339 set_bit(IPOIB_STOP_NEIGH_GC, &cpriv->flags); 1340 cancel_delayed_work(&cpriv->neigh_reap_task); 1341 unregister_netdevice_queue(cpriv->dev, &head); 1342 } 1343 unregister_netdevice_many(&head); 1344 1345 /* 1346 * Must be before ipoib_ib_dev_cleanup or we delete an in use 1347 * work queue 1348 */ 1349 ipoib_neigh_hash_uninit(dev); 1350 1351 ipoib_ib_dev_cleanup(dev); 1352 1353 kfree(priv->rx_ring); 1354 vfree(priv->tx_ring); 1355 1356 priv->rx_ring = NULL; 1357 priv->tx_ring = NULL; 1358} 1359 1360static const struct header_ops ipoib_header_ops = { 1361 .create = ipoib_hard_header, 1362}; 1363 1364static const struct net_device_ops ipoib_netdev_ops = { 1365 .ndo_uninit = ipoib_uninit, 1366 .ndo_open = ipoib_open, 1367 .ndo_stop = ipoib_stop, 1368 .ndo_change_mtu = ipoib_change_mtu, 1369 .ndo_fix_features = ipoib_fix_features, 1370 .ndo_start_xmit = ipoib_start_xmit, 1371 .ndo_tx_timeout = ipoib_timeout, 1372 .ndo_set_rx_mode = ipoib_set_mcast_list, 1373 .ndo_get_iflink = ipoib_get_iflink, 1374}; 1375 1376void ipoib_setup(struct net_device *dev) 1377{ 1378 struct ipoib_dev_priv *priv = netdev_priv(dev); 1379 1380 dev->netdev_ops = &ipoib_netdev_ops; 1381 dev->header_ops = &ipoib_header_ops; 1382 1383 ipoib_set_ethtool_ops(dev); 1384 1385 netif_napi_add(dev, &priv->napi, ipoib_poll, NAPI_POLL_WEIGHT); 1386 1387 dev->watchdog_timeo = HZ; 1388 1389 dev->flags |= IFF_BROADCAST | IFF_MULTICAST; 1390 1391 dev->hard_header_len = IPOIB_ENCAP_LEN; 1392 dev->addr_len = INFINIBAND_ALEN; 1393 dev->type = ARPHRD_INFINIBAND; 1394 dev->tx_queue_len = ipoib_sendq_size * 2; 1395 dev->features = (NETIF_F_VLAN_CHALLENGED | 1396 NETIF_F_HIGHDMA); 1397 netif_keep_dst(dev); 1398 1399 memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN); 1400 1401 priv->dev = dev; 1402 1403 spin_lock_init(&priv->lock); 1404 1405 init_rwsem(&priv->vlan_rwsem); 1406 1407 INIT_LIST_HEAD(&priv->path_list); 1408 INIT_LIST_HEAD(&priv->child_intfs); 1409 INIT_LIST_HEAD(&priv->dead_ahs); 1410 INIT_LIST_HEAD(&priv->multicast_list); 1411 1412 INIT_DELAYED_WORK(&priv->mcast_task, ipoib_mcast_join_task); 1413 INIT_WORK(&priv->carrier_on_task, ipoib_mcast_carrier_on_task); 1414 INIT_WORK(&priv->flush_light, ipoib_ib_dev_flush_light); 1415 INIT_WORK(&priv->flush_normal, ipoib_ib_dev_flush_normal); 1416 INIT_WORK(&priv->flush_heavy, ipoib_ib_dev_flush_heavy); 1417 INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task); 1418 INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah); 1419 INIT_DELAYED_WORK(&priv->neigh_reap_task, ipoib_reap_neigh); 1420} 1421 1422struct ipoib_dev_priv *ipoib_intf_alloc(const char *name) 1423{ 1424 struct net_device *dev; 1425 1426 dev = alloc_netdev((int)sizeof(struct ipoib_dev_priv), name, 1427 NET_NAME_UNKNOWN, ipoib_setup); 1428 if (!dev) 1429 return NULL; 1430 1431 return netdev_priv(dev); 1432} 1433 1434static ssize_t show_pkey(struct device *dev, 1435 struct device_attribute *attr, char *buf) 1436{ 1437 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev)); 1438 1439 return sprintf(buf, "0x%04x\n", priv->pkey); 1440} 1441static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL); 1442 1443static ssize_t show_umcast(struct device *dev, 1444 struct device_attribute *attr, char *buf) 1445{ 1446 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev)); 1447 1448 return sprintf(buf, "%d\n", test_bit(IPOIB_FLAG_UMCAST, &priv->flags)); 1449} 1450 1451void ipoib_set_umcast(struct net_device *ndev, int umcast_val) 1452{ 1453 struct ipoib_dev_priv *priv = netdev_priv(ndev); 1454 1455 if (umcast_val > 0) { 1456 set_bit(IPOIB_FLAG_UMCAST, &priv->flags); 1457 ipoib_warn(priv, "ignoring multicast groups joined directly " 1458 "by userspace\n"); 1459 } else 1460 clear_bit(IPOIB_FLAG_UMCAST, &priv->flags); 1461} 1462 1463static ssize_t set_umcast(struct device *dev, 1464 struct device_attribute *attr, 1465 const char *buf, size_t count) 1466{ 1467 unsigned long umcast_val = simple_strtoul(buf, NULL, 0); 1468 1469 ipoib_set_umcast(to_net_dev(dev), umcast_val); 1470 1471 return count; 1472} 1473static DEVICE_ATTR(umcast, S_IWUSR | S_IRUGO, show_umcast, set_umcast); 1474 1475int ipoib_add_umcast_attr(struct net_device *dev) 1476{ 1477 return device_create_file(&dev->dev, &dev_attr_umcast); 1478} 1479 1480static ssize_t create_child(struct device *dev, 1481 struct device_attribute *attr, 1482 const char *buf, size_t count) 1483{ 1484 int pkey; 1485 int ret; 1486 1487 if (sscanf(buf, "%i", &pkey) != 1) 1488 return -EINVAL; 1489 1490 if (pkey <= 0 || pkey > 0xffff || pkey == 0x8000) 1491 return -EINVAL; 1492 1493 /* 1494 * Set the full membership bit, so that we join the right 1495 * broadcast group, etc. 1496 */ 1497 pkey |= 0x8000; 1498 1499 ret = ipoib_vlan_add(to_net_dev(dev), pkey); 1500 1501 return ret ? ret : count; 1502} 1503static DEVICE_ATTR(create_child, S_IWUSR, NULL, create_child); 1504 1505static ssize_t delete_child(struct device *dev, 1506 struct device_attribute *attr, 1507 const char *buf, size_t count) 1508{ 1509 int pkey; 1510 int ret; 1511 1512 if (sscanf(buf, "%i", &pkey) != 1) 1513 return -EINVAL; 1514 1515 if (pkey < 0 || pkey > 0xffff) 1516 return -EINVAL; 1517 1518 ret = ipoib_vlan_delete(to_net_dev(dev), pkey); 1519 1520 return ret ? ret : count; 1521 1522} 1523static DEVICE_ATTR(delete_child, S_IWUSR, NULL, delete_child); 1524 1525int ipoib_add_pkey_attr(struct net_device *dev) 1526{ 1527 return device_create_file(&dev->dev, &dev_attr_pkey); 1528} 1529 1530int ipoib_set_dev_features(struct ipoib_dev_priv *priv, struct ib_device *hca) 1531{ 1532 struct ib_device_attr *device_attr; 1533 int result = -ENOMEM; 1534 1535 device_attr = kmalloc(sizeof *device_attr, GFP_KERNEL); 1536 if (!device_attr) { 1537 printk(KERN_WARNING "%s: allocation of %zu bytes failed\n", 1538 hca->name, sizeof *device_attr); 1539 return result; 1540 } 1541 1542 result = ib_query_device(hca, device_attr); 1543 if (result) { 1544 printk(KERN_WARNING "%s: ib_query_device failed (ret = %d)\n", 1545 hca->name, result); 1546 kfree(device_attr); 1547 return result; 1548 } 1549 priv->hca_caps = device_attr->device_cap_flags; 1550 1551 kfree(device_attr); 1552 1553 if (priv->hca_caps & IB_DEVICE_UD_IP_CSUM) { 1554 priv->dev->hw_features = NETIF_F_SG | 1555 NETIF_F_IP_CSUM | NETIF_F_RXCSUM; 1556 1557 if (priv->hca_caps & IB_DEVICE_UD_TSO) 1558 priv->dev->hw_features |= NETIF_F_TSO; 1559 1560 priv->dev->features |= priv->dev->hw_features; 1561 } 1562 1563 return 0; 1564} 1565 1566static struct net_device *ipoib_add_port(const char *format, 1567 struct ib_device *hca, u8 port) 1568{ 1569 struct ipoib_dev_priv *priv; 1570 struct ib_port_attr attr; 1571 int result = -ENOMEM; 1572 1573 priv = ipoib_intf_alloc(format); 1574 if (!priv) 1575 goto alloc_mem_failed; 1576 1577 SET_NETDEV_DEV(priv->dev, hca->dma_device); 1578 priv->dev->dev_id = port - 1; 1579 1580 if (!ib_query_port(hca, port, &attr)) 1581 priv->max_ib_mtu = ib_mtu_enum_to_int(attr.max_mtu); 1582 else { 1583 printk(KERN_WARNING "%s: ib_query_port %d failed\n", 1584 hca->name, port); 1585 goto device_init_failed; 1586 } 1587 1588 /* MTU will be reset when mcast join happens */ 1589 priv->dev->mtu = IPOIB_UD_MTU(priv->max_ib_mtu); 1590 priv->mcast_mtu = priv->admin_mtu = priv->dev->mtu; 1591 1592 priv->dev->neigh_priv_len = sizeof(struct ipoib_neigh); 1593 1594 result = ib_query_pkey(hca, port, 0, &priv->pkey); 1595 if (result) { 1596 printk(KERN_WARNING "%s: ib_query_pkey port %d failed (ret = %d)\n", 1597 hca->name, port, result); 1598 goto device_init_failed; 1599 } 1600 1601 if (ipoib_set_dev_features(priv, hca)) 1602 goto device_init_failed; 1603 1604 /* 1605 * Set the full membership bit, so that we join the right 1606 * broadcast group, etc. 1607 */ 1608 priv->pkey |= 0x8000; 1609 1610 priv->dev->broadcast[8] = priv->pkey >> 8; 1611 priv->dev->broadcast[9] = priv->pkey & 0xff; 1612 1613 result = ib_query_gid(hca, port, 0, &priv->local_gid); 1614 if (result) { 1615 printk(KERN_WARNING "%s: ib_query_gid port %d failed (ret = %d)\n", 1616 hca->name, port, result); 1617 goto device_init_failed; 1618 } else 1619 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid)); 1620 1621 result = ipoib_dev_init(priv->dev, hca, port); 1622 if (result < 0) { 1623 printk(KERN_WARNING "%s: failed to initialize port %d (ret = %d)\n", 1624 hca->name, port, result); 1625 goto device_init_failed; 1626 } 1627 1628 INIT_IB_EVENT_HANDLER(&priv->event_handler, 1629 priv->ca, ipoib_event); 1630 result = ib_register_event_handler(&priv->event_handler); 1631 if (result < 0) { 1632 printk(KERN_WARNING "%s: ib_register_event_handler failed for " 1633 "port %d (ret = %d)\n", 1634 hca->name, port, result); 1635 goto event_failed; 1636 } 1637 1638 result = register_netdev(priv->dev); 1639 if (result) { 1640 printk(KERN_WARNING "%s: couldn't register ipoib port %d; error %d\n", 1641 hca->name, port, result); 1642 goto register_failed; 1643 } 1644 1645 ipoib_create_debug_files(priv->dev); 1646 1647 if (ipoib_cm_add_mode_attr(priv->dev)) 1648 goto sysfs_failed; 1649 if (ipoib_add_pkey_attr(priv->dev)) 1650 goto sysfs_failed; 1651 if (ipoib_add_umcast_attr(priv->dev)) 1652 goto sysfs_failed; 1653 if (device_create_file(&priv->dev->dev, &dev_attr_create_child)) 1654 goto sysfs_failed; 1655 if (device_create_file(&priv->dev->dev, &dev_attr_delete_child)) 1656 goto sysfs_failed; 1657 1658 return priv->dev; 1659 1660sysfs_failed: 1661 ipoib_delete_debug_files(priv->dev); 1662 unregister_netdev(priv->dev); 1663 1664register_failed: 1665 ib_unregister_event_handler(&priv->event_handler); 1666 flush_workqueue(ipoib_workqueue); 1667 /* Stop GC if started before flush */ 1668 set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags); 1669 cancel_delayed_work(&priv->neigh_reap_task); 1670 flush_workqueue(priv->wq); 1671 1672event_failed: 1673 ipoib_dev_cleanup(priv->dev); 1674 1675device_init_failed: 1676 free_netdev(priv->dev); 1677 1678alloc_mem_failed: 1679 return ERR_PTR(result); 1680} 1681 1682static void ipoib_add_one(struct ib_device *device) 1683{ 1684 struct list_head *dev_list; 1685 struct net_device *dev; 1686 struct ipoib_dev_priv *priv; 1687 int s, e, p; 1688 1689 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB) 1690 return; 1691 1692 dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL); 1693 if (!dev_list) 1694 return; 1695 1696 INIT_LIST_HEAD(dev_list); 1697 1698 if (device->node_type == RDMA_NODE_IB_SWITCH) { 1699 s = 0; 1700 e = 0; 1701 } else { 1702 s = 1; 1703 e = device->phys_port_cnt; 1704 } 1705 1706 for (p = s; p <= e; ++p) { 1707 if (rdma_port_get_link_layer(device, p) != IB_LINK_LAYER_INFINIBAND) 1708 continue; 1709 dev = ipoib_add_port("ib%d", device, p); 1710 if (!IS_ERR(dev)) { 1711 priv = netdev_priv(dev); 1712 list_add_tail(&priv->list, dev_list); 1713 } 1714 } 1715 1716 ib_set_client_data(device, &ipoib_client, dev_list); 1717} 1718 1719static void ipoib_remove_one(struct ib_device *device) 1720{ 1721 struct ipoib_dev_priv *priv, *tmp; 1722 struct list_head *dev_list; 1723 1724 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB) 1725 return; 1726 1727 dev_list = ib_get_client_data(device, &ipoib_client); 1728 if (!dev_list) 1729 return; 1730 1731 list_for_each_entry_safe(priv, tmp, dev_list, list) { 1732 ib_unregister_event_handler(&priv->event_handler); 1733 flush_workqueue(ipoib_workqueue); 1734 1735 rtnl_lock(); 1736 dev_change_flags(priv->dev, priv->dev->flags & ~IFF_UP); 1737 rtnl_unlock(); 1738 1739 /* Stop GC */ 1740 set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags); 1741 cancel_delayed_work(&priv->neigh_reap_task); 1742 flush_workqueue(priv->wq); 1743 1744 unregister_netdev(priv->dev); 1745 free_netdev(priv->dev); 1746 } 1747 1748 kfree(dev_list); 1749} 1750 1751static int __init ipoib_init_module(void) 1752{ 1753 int ret; 1754 1755 ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size); 1756 ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE); 1757 ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE); 1758 1759 ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size); 1760 ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE); 1761 ipoib_sendq_size = max3(ipoib_sendq_size, 2 * MAX_SEND_CQE, IPOIB_MIN_QUEUE_SIZE); 1762#ifdef CONFIG_INFINIBAND_IPOIB_CM 1763 ipoib_max_conn_qp = min(ipoib_max_conn_qp, IPOIB_CM_MAX_CONN_QP); 1764#endif 1765 1766 /* 1767 * When copying small received packets, we only copy from the 1768 * linear data part of the SKB, so we rely on this condition. 1769 */ 1770 BUILD_BUG_ON(IPOIB_CM_COPYBREAK > IPOIB_CM_HEAD_SIZE); 1771 1772 ret = ipoib_register_debugfs(); 1773 if (ret) 1774 return ret; 1775 1776 /* 1777 * We create a global workqueue here that is used for all flush 1778 * operations. However, if you attempt to flush a workqueue 1779 * from a task on that same workqueue, it deadlocks the system. 1780 * We want to be able to flush the tasks associated with a 1781 * specific net device, so we also create a workqueue for each 1782 * netdevice. We queue up the tasks for that device only on 1783 * its private workqueue, and we only queue up flush events 1784 * on our global flush workqueue. This avoids the deadlocks. 1785 */ 1786 ipoib_workqueue = create_singlethread_workqueue("ipoib_flush"); 1787 if (!ipoib_workqueue) { 1788 ret = -ENOMEM; 1789 goto err_fs; 1790 } 1791 1792 ib_sa_register_client(&ipoib_sa_client); 1793 1794 ret = ib_register_client(&ipoib_client); 1795 if (ret) 1796 goto err_sa; 1797 1798 ret = ipoib_netlink_init(); 1799 if (ret) 1800 goto err_client; 1801 1802 return 0; 1803 1804err_client: 1805 ib_unregister_client(&ipoib_client); 1806 1807err_sa: 1808 ib_sa_unregister_client(&ipoib_sa_client); 1809 destroy_workqueue(ipoib_workqueue); 1810 1811err_fs: 1812 ipoib_unregister_debugfs(); 1813 1814 return ret; 1815} 1816 1817static void __exit ipoib_cleanup_module(void) 1818{ 1819 ipoib_netlink_fini(); 1820 ib_unregister_client(&ipoib_client); 1821 ib_sa_unregister_client(&ipoib_sa_client); 1822 ipoib_unregister_debugfs(); 1823 destroy_workqueue(ipoib_workqueue); 1824} 1825 1826module_init(ipoib_init_module); 1827module_exit(ipoib_cleanup_module); 1828