1 /* 2 * Copyright (c) 2004, 2005 Topspin Communications. All rights reserved. 3 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved. 4 * Copyright (c) 2005 Mellanox Technologies. All rights reserved. 5 * Copyright (c) 2004, 2005 Voltaire, Inc. All rights reserved. 6 * 7 * This software is available to you under a choice of one of two 8 * licenses. You may choose to be licensed under the terms of the GNU 9 * General Public License (GPL) Version 2, available from the file 10 * COPYING in the main directory of this source tree, or the 11 * OpenIB.org BSD license below: 12 * 13 * Redistribution and use in source and binary forms, with or 14 * without modification, are permitted provided that the following 15 * conditions are met: 16 * 17 * - Redistributions of source code must retain the above 18 * copyright notice, this list of conditions and the following 19 * disclaimer. 20 * 21 * - Redistributions in binary form must reproduce the above 22 * copyright notice, this list of conditions and the following 23 * disclaimer in the documentation and/or other materials 24 * provided with the distribution. 25 * 26 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 27 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 28 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 29 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 30 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 31 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 32 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 33 * SOFTWARE. 34 * 35 * $Id: ipoib_ib.c 1386 2004-12-27 16:23:17Z roland $ 36 */ 37 38 #include <linux/delay.h> 39 #include <linux/dma-mapping.h> 40 41 #include <rdma/ib_cache.h> 42 43 #include "ipoib.h" 44 45 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA 46 static int data_debug_level; 47 48 module_param(data_debug_level, int, 0644); 49 MODULE_PARM_DESC(data_debug_level, 50 "Enable data path debug tracing if > 0"); 51 #endif 52 53 static DEFINE_MUTEX(pkey_mutex); 54 55 struct ipoib_ah *ipoib_create_ah(struct net_device *dev, 56 struct ib_pd *pd, struct ib_ah_attr *attr) 57 { 58 struct ipoib_ah *ah; 59 60 ah = kmalloc(sizeof *ah, GFP_KERNEL); 61 if (!ah) 62 return NULL; 63 64 ah->dev = dev; 65 ah->last_send = 0; 66 kref_init(&ah->ref); 67 68 ah->ah = ib_create_ah(pd, attr); 69 if (IS_ERR(ah->ah)) { 70 kfree(ah); 71 ah = NULL; 72 } else 73 ipoib_dbg(netdev_priv(dev), "Created ah %p\n", ah->ah); 74 75 return ah; 76 } 77 78 void ipoib_free_ah(struct kref *kref) 79 { 80 struct ipoib_ah *ah = container_of(kref, struct ipoib_ah, ref); 81 struct ipoib_dev_priv *priv = netdev_priv(ah->dev); 82 83 unsigned long flags; 84 85 spin_lock_irqsave(&priv->lock, flags); 86 list_add_tail(&ah->list, &priv->dead_ahs); 87 spin_unlock_irqrestore(&priv->lock, flags); 88 } 89 90 static int ipoib_ib_post_receive(struct net_device *dev, int id) 91 { 92 struct ipoib_dev_priv *priv = netdev_priv(dev); 93 struct ib_sge list; 94 struct ib_recv_wr param; 95 struct ib_recv_wr *bad_wr; 96 int ret; 97 98 list.addr = priv->rx_ring[id].mapping; 99 list.length = IPOIB_BUF_SIZE; 100 list.lkey = priv->mr->lkey; 101 102 param.next = NULL; 103 param.wr_id = id | IPOIB_OP_RECV; 104 param.sg_list = &list; 105 param.num_sge = 1; 106 107 ret = ib_post_recv(priv->qp, ¶m, &bad_wr); 108 if (unlikely(ret)) { 109 ipoib_warn(priv, "receive failed for buf %d (%d)\n", id, ret); 110 ib_dma_unmap_single(priv->ca, priv->rx_ring[id].mapping, 111 IPOIB_BUF_SIZE, DMA_FROM_DEVICE); 112 dev_kfree_skb_any(priv->rx_ring[id].skb); 113 priv->rx_ring[id].skb = NULL; 114 } 115 116 return ret; 117 } 118 119 static int ipoib_alloc_rx_skb(struct net_device *dev, int id) 120 { 121 struct ipoib_dev_priv *priv = netdev_priv(dev); 122 struct sk_buff *skb; 123 u64 addr; 124 125 skb = dev_alloc_skb(IPOIB_BUF_SIZE + 4); 126 if (!skb) 127 return -ENOMEM; 128 129 /* 130 * IB will leave a 40 byte gap for a GRH and IPoIB adds a 4 byte 131 * header. So we need 4 more bytes to get to 48 and align the 132 * IP header to a multiple of 16. 133 */ 134 skb_reserve(skb, 4); 135 136 addr = ib_dma_map_single(priv->ca, skb->data, IPOIB_BUF_SIZE, 137 DMA_FROM_DEVICE); 138 if (unlikely(ib_dma_mapping_error(priv->ca, addr))) { 139 dev_kfree_skb_any(skb); 140 return -EIO; 141 } 142 143 priv->rx_ring[id].skb = skb; 144 priv->rx_ring[id].mapping = addr; 145 146 return 0; 147 } 148 149 static int ipoib_ib_post_receives(struct net_device *dev) 150 { 151 struct ipoib_dev_priv *priv = netdev_priv(dev); 152 int i; 153 154 for (i = 0; i < ipoib_recvq_size; ++i) { 155 if (ipoib_alloc_rx_skb(dev, i)) { 156 ipoib_warn(priv, "failed to allocate receive buffer %d\n", i); 157 return -ENOMEM; 158 } 159 if (ipoib_ib_post_receive(dev, i)) { 160 ipoib_warn(priv, "ipoib_ib_post_receive failed for buf %d\n", i); 161 return -EIO; 162 } 163 } 164 165 return 0; 166 } 167 168 static void ipoib_ib_handle_rx_wc(struct net_device *dev, struct ib_wc *wc) 169 { 170 struct ipoib_dev_priv *priv = netdev_priv(dev); 171 unsigned int wr_id = wc->wr_id & ~IPOIB_OP_RECV; 172 struct sk_buff *skb; 173 u64 addr; 174 175 ipoib_dbg_data(priv, "recv completion: id %d, status: %d\n", 176 wr_id, wc->status); 177 178 if (unlikely(wr_id >= ipoib_recvq_size)) { 179 ipoib_warn(priv, "recv completion event with wrid %d (> %d)\n", 180 wr_id, ipoib_recvq_size); 181 return; 182 } 183 184 skb = priv->rx_ring[wr_id].skb; 185 addr = priv->rx_ring[wr_id].mapping; 186 187 if (unlikely(wc->status != IB_WC_SUCCESS)) { 188 if (wc->status != IB_WC_WR_FLUSH_ERR) 189 ipoib_warn(priv, "failed recv event " 190 "(status=%d, wrid=%d vend_err %x)\n", 191 wc->status, wr_id, wc->vendor_err); 192 ib_dma_unmap_single(priv->ca, addr, 193 IPOIB_BUF_SIZE, DMA_FROM_DEVICE); 194 dev_kfree_skb_any(skb); 195 priv->rx_ring[wr_id].skb = NULL; 196 return; 197 } 198 199 /* 200 * Drop packets that this interface sent, ie multicast packets 201 * that the HCA has replicated. 202 */ 203 if (wc->slid == priv->local_lid && wc->src_qp == priv->qp->qp_num) 204 goto repost; 205 206 /* 207 * If we can't allocate a new RX buffer, dump 208 * this packet and reuse the old buffer. 209 */ 210 if (unlikely(ipoib_alloc_rx_skb(dev, wr_id))) { 211 ++dev->stats.rx_dropped; 212 goto repost; 213 } 214 215 ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n", 216 wc->byte_len, wc->slid); 217 218 ib_dma_unmap_single(priv->ca, addr, IPOIB_BUF_SIZE, DMA_FROM_DEVICE); 219 220 skb_put(skb, wc->byte_len); 221 skb_pull(skb, IB_GRH_BYTES); 222 223 skb->protocol = ((struct ipoib_header *) skb->data)->proto; 224 skb_reset_mac_header(skb); 225 skb_pull(skb, IPOIB_ENCAP_LEN); 226 227 dev->last_rx = jiffies; 228 ++dev->stats.rx_packets; 229 dev->stats.rx_bytes += skb->len; 230 231 skb->dev = dev; 232 /* XXX get correct PACKET_ type here */ 233 skb->pkt_type = PACKET_HOST; 234 netif_receive_skb(skb); 235 236 repost: 237 if (unlikely(ipoib_ib_post_receive(dev, wr_id))) 238 ipoib_warn(priv, "ipoib_ib_post_receive failed " 239 "for buf %d\n", wr_id); 240 } 241 242 static void ipoib_ib_handle_tx_wc(struct net_device *dev, struct ib_wc *wc) 243 { 244 struct ipoib_dev_priv *priv = netdev_priv(dev); 245 unsigned int wr_id = wc->wr_id; 246 struct ipoib_tx_buf *tx_req; 247 unsigned long flags; 248 249 ipoib_dbg_data(priv, "send completion: id %d, status: %d\n", 250 wr_id, wc->status); 251 252 if (unlikely(wr_id >= ipoib_sendq_size)) { 253 ipoib_warn(priv, "send completion event with wrid %d (> %d)\n", 254 wr_id, ipoib_sendq_size); 255 return; 256 } 257 258 tx_req = &priv->tx_ring[wr_id]; 259 260 ib_dma_unmap_single(priv->ca, tx_req->mapping, 261 tx_req->skb->len, DMA_TO_DEVICE); 262 263 ++dev->stats.tx_packets; 264 dev->stats.tx_bytes += tx_req->skb->len; 265 266 dev_kfree_skb_any(tx_req->skb); 267 268 spin_lock_irqsave(&priv->tx_lock, flags); 269 ++priv->tx_tail; 270 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) && 271 netif_queue_stopped(dev) && 272 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) 273 netif_wake_queue(dev); 274 spin_unlock_irqrestore(&priv->tx_lock, flags); 275 276 if (wc->status != IB_WC_SUCCESS && 277 wc->status != IB_WC_WR_FLUSH_ERR) 278 ipoib_warn(priv, "failed send event " 279 "(status=%d, wrid=%d vend_err %x)\n", 280 wc->status, wr_id, wc->vendor_err); 281 } 282 283 int ipoib_poll(struct napi_struct *napi, int budget) 284 { 285 struct ipoib_dev_priv *priv = container_of(napi, struct ipoib_dev_priv, napi); 286 struct net_device *dev = priv->dev; 287 int done; 288 int t; 289 int n, i; 290 291 done = 0; 292 293 poll_more: 294 while (done < budget) { 295 int max = (budget - done); 296 297 t = min(IPOIB_NUM_WC, max); 298 n = ib_poll_cq(priv->cq, t, priv->ibwc); 299 300 for (i = 0; i < n; i++) { 301 struct ib_wc *wc = priv->ibwc + i; 302 303 if (wc->wr_id & IPOIB_OP_RECV) { 304 ++done; 305 if (wc->wr_id & IPOIB_OP_CM) 306 ipoib_cm_handle_rx_wc(dev, wc); 307 else 308 ipoib_ib_handle_rx_wc(dev, wc); 309 } else { 310 if (wc->wr_id & IPOIB_OP_CM) 311 ipoib_cm_handle_tx_wc(dev, wc); 312 else 313 ipoib_ib_handle_tx_wc(dev, wc); 314 } 315 } 316 317 if (n != t) 318 break; 319 } 320 321 if (done < budget) { 322 netif_rx_complete(dev, napi); 323 if (unlikely(ib_req_notify_cq(priv->cq, 324 IB_CQ_NEXT_COMP | 325 IB_CQ_REPORT_MISSED_EVENTS)) && 326 netif_rx_reschedule(dev, napi)) 327 goto poll_more; 328 } 329 330 return done; 331 } 332 333 void ipoib_ib_completion(struct ib_cq *cq, void *dev_ptr) 334 { 335 struct net_device *dev = dev_ptr; 336 struct ipoib_dev_priv *priv = netdev_priv(dev); 337 338 netif_rx_schedule(dev, &priv->napi); 339 } 340 341 static inline int post_send(struct ipoib_dev_priv *priv, 342 unsigned int wr_id, 343 struct ib_ah *address, u32 qpn, 344 u64 addr, int len) 345 { 346 struct ib_send_wr *bad_wr; 347 348 priv->tx_sge.addr = addr; 349 priv->tx_sge.length = len; 350 351 priv->tx_wr.wr_id = wr_id; 352 priv->tx_wr.wr.ud.remote_qpn = qpn; 353 priv->tx_wr.wr.ud.ah = address; 354 355 return ib_post_send(priv->qp, &priv->tx_wr, &bad_wr); 356 } 357 358 void ipoib_send(struct net_device *dev, struct sk_buff *skb, 359 struct ipoib_ah *address, u32 qpn) 360 { 361 struct ipoib_dev_priv *priv = netdev_priv(dev); 362 struct ipoib_tx_buf *tx_req; 363 u64 addr; 364 365 if (unlikely(skb->len > priv->mcast_mtu + IPOIB_ENCAP_LEN)) { 366 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n", 367 skb->len, priv->mcast_mtu + IPOIB_ENCAP_LEN); 368 ++dev->stats.tx_dropped; 369 ++dev->stats.tx_errors; 370 ipoib_cm_skb_too_long(dev, skb, priv->mcast_mtu); 371 return; 372 } 373 374 ipoib_dbg_data(priv, "sending packet, length=%d address=%p qpn=0x%06x\n", 375 skb->len, address, qpn); 376 377 /* 378 * We put the skb into the tx_ring _before_ we call post_send() 379 * because it's entirely possible that the completion handler will 380 * run before we execute anything after the post_send(). That 381 * means we have to make sure everything is properly recorded and 382 * our state is consistent before we call post_send(). 383 */ 384 tx_req = &priv->tx_ring[priv->tx_head & (ipoib_sendq_size - 1)]; 385 tx_req->skb = skb; 386 addr = ib_dma_map_single(priv->ca, skb->data, skb->len, 387 DMA_TO_DEVICE); 388 if (unlikely(ib_dma_mapping_error(priv->ca, addr))) { 389 ++dev->stats.tx_errors; 390 dev_kfree_skb_any(skb); 391 return; 392 } 393 tx_req->mapping = addr; 394 395 if (unlikely(post_send(priv, priv->tx_head & (ipoib_sendq_size - 1), 396 address->ah, qpn, addr, skb->len))) { 397 ipoib_warn(priv, "post_send failed\n"); 398 ++dev->stats.tx_errors; 399 ib_dma_unmap_single(priv->ca, addr, skb->len, DMA_TO_DEVICE); 400 dev_kfree_skb_any(skb); 401 } else { 402 dev->trans_start = jiffies; 403 404 address->last_send = priv->tx_head; 405 ++priv->tx_head; 406 407 if (++priv->tx_outstanding == ipoib_sendq_size) { 408 ipoib_dbg(priv, "TX ring full, stopping kernel net queue\n"); 409 netif_stop_queue(dev); 410 } 411 } 412 } 413 414 static void __ipoib_reap_ah(struct net_device *dev) 415 { 416 struct ipoib_dev_priv *priv = netdev_priv(dev); 417 struct ipoib_ah *ah, *tah; 418 LIST_HEAD(remove_list); 419 420 spin_lock_irq(&priv->tx_lock); 421 spin_lock(&priv->lock); 422 list_for_each_entry_safe(ah, tah, &priv->dead_ahs, list) 423 if ((int) priv->tx_tail - (int) ah->last_send >= 0) { 424 list_del(&ah->list); 425 ib_destroy_ah(ah->ah); 426 kfree(ah); 427 } 428 spin_unlock(&priv->lock); 429 spin_unlock_irq(&priv->tx_lock); 430 } 431 432 void ipoib_reap_ah(struct work_struct *work) 433 { 434 struct ipoib_dev_priv *priv = 435 container_of(work, struct ipoib_dev_priv, ah_reap_task.work); 436 struct net_device *dev = priv->dev; 437 438 __ipoib_reap_ah(dev); 439 440 if (!test_bit(IPOIB_STOP_REAPER, &priv->flags)) 441 queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task, 442 round_jiffies_relative(HZ)); 443 } 444 445 int ipoib_ib_dev_open(struct net_device *dev) 446 { 447 struct ipoib_dev_priv *priv = netdev_priv(dev); 448 int ret; 449 450 if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &priv->pkey_index)) { 451 ipoib_warn(priv, "P_Key 0x%04x not found\n", priv->pkey); 452 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags); 453 return -1; 454 } 455 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags); 456 457 ret = ipoib_init_qp(dev); 458 if (ret) { 459 ipoib_warn(priv, "ipoib_init_qp returned %d\n", ret); 460 return -1; 461 } 462 463 ret = ipoib_ib_post_receives(dev); 464 if (ret) { 465 ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret); 466 ipoib_ib_dev_stop(dev, 1); 467 return -1; 468 } 469 470 ret = ipoib_cm_dev_open(dev); 471 if (ret) { 472 ipoib_warn(priv, "ipoib_cm_dev_open returned %d\n", ret); 473 ipoib_ib_dev_stop(dev, 1); 474 return -1; 475 } 476 477 clear_bit(IPOIB_STOP_REAPER, &priv->flags); 478 queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task, 479 round_jiffies_relative(HZ)); 480 481 set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags); 482 483 return 0; 484 } 485 486 static void ipoib_pkey_dev_check_presence(struct net_device *dev) 487 { 488 struct ipoib_dev_priv *priv = netdev_priv(dev); 489 u16 pkey_index = 0; 490 491 if (ib_find_cached_pkey(priv->ca, priv->port, priv->pkey, &pkey_index)) 492 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags); 493 else 494 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags); 495 } 496 497 int ipoib_ib_dev_up(struct net_device *dev) 498 { 499 struct ipoib_dev_priv *priv = netdev_priv(dev); 500 501 ipoib_pkey_dev_check_presence(dev); 502 503 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) { 504 ipoib_dbg(priv, "PKEY is not assigned.\n"); 505 return 0; 506 } 507 508 set_bit(IPOIB_FLAG_OPER_UP, &priv->flags); 509 510 return ipoib_mcast_start_thread(dev); 511 } 512 513 int ipoib_ib_dev_down(struct net_device *dev, int flush) 514 { 515 struct ipoib_dev_priv *priv = netdev_priv(dev); 516 517 ipoib_dbg(priv, "downing ib_dev\n"); 518 519 clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags); 520 netif_carrier_off(dev); 521 522 /* Shutdown the P_Key thread if still active */ 523 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) { 524 mutex_lock(&pkey_mutex); 525 set_bit(IPOIB_PKEY_STOP, &priv->flags); 526 cancel_delayed_work(&priv->pkey_poll_task); 527 mutex_unlock(&pkey_mutex); 528 if (flush) 529 flush_workqueue(ipoib_workqueue); 530 } 531 532 ipoib_mcast_stop_thread(dev, flush); 533 ipoib_mcast_dev_flush(dev); 534 535 ipoib_flush_paths(dev); 536 537 return 0; 538 } 539 540 static int recvs_pending(struct net_device *dev) 541 { 542 struct ipoib_dev_priv *priv = netdev_priv(dev); 543 int pending = 0; 544 int i; 545 546 for (i = 0; i < ipoib_recvq_size; ++i) 547 if (priv->rx_ring[i].skb) 548 ++pending; 549 550 return pending; 551 } 552 553 void ipoib_drain_cq(struct net_device *dev) 554 { 555 struct ipoib_dev_priv *priv = netdev_priv(dev); 556 int i, n; 557 do { 558 n = ib_poll_cq(priv->cq, IPOIB_NUM_WC, priv->ibwc); 559 for (i = 0; i < n; ++i) { 560 /* 561 * Convert any successful completions to flush 562 * errors to avoid passing packets up the 563 * stack after bringing the device down. 564 */ 565 if (priv->ibwc[i].status == IB_WC_SUCCESS) 566 priv->ibwc[i].status = IB_WC_WR_FLUSH_ERR; 567 568 if (priv->ibwc[i].wr_id & IPOIB_OP_RECV) { 569 if (priv->ibwc[i].wr_id & IPOIB_OP_CM) 570 ipoib_cm_handle_rx_wc(dev, priv->ibwc + i); 571 else 572 ipoib_ib_handle_rx_wc(dev, priv->ibwc + i); 573 } else { 574 if (priv->ibwc[i].wr_id & IPOIB_OP_CM) 575 ipoib_cm_handle_tx_wc(dev, priv->ibwc + i); 576 else 577 ipoib_ib_handle_tx_wc(dev, priv->ibwc + i); 578 } 579 } 580 } while (n == IPOIB_NUM_WC); 581 } 582 583 int ipoib_ib_dev_stop(struct net_device *dev, int flush) 584 { 585 struct ipoib_dev_priv *priv = netdev_priv(dev); 586 struct ib_qp_attr qp_attr; 587 unsigned long begin; 588 struct ipoib_tx_buf *tx_req; 589 int i; 590 591 clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags); 592 593 ipoib_cm_dev_stop(dev); 594 595 /* 596 * Move our QP to the error state and then reinitialize in 597 * when all work requests have completed or have been flushed. 598 */ 599 qp_attr.qp_state = IB_QPS_ERR; 600 if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE)) 601 ipoib_warn(priv, "Failed to modify QP to ERROR state\n"); 602 603 /* Wait for all sends and receives to complete */ 604 begin = jiffies; 605 606 while (priv->tx_head != priv->tx_tail || recvs_pending(dev)) { 607 if (time_after(jiffies, begin + 5 * HZ)) { 608 ipoib_warn(priv, "timing out; %d sends %d receives not completed\n", 609 priv->tx_head - priv->tx_tail, recvs_pending(dev)); 610 611 /* 612 * assume the HW is wedged and just free up 613 * all our pending work requests. 614 */ 615 while ((int) priv->tx_tail - (int) priv->tx_head < 0) { 616 tx_req = &priv->tx_ring[priv->tx_tail & 617 (ipoib_sendq_size - 1)]; 618 ib_dma_unmap_single(priv->ca, 619 tx_req->mapping, 620 tx_req->skb->len, 621 DMA_TO_DEVICE); 622 dev_kfree_skb_any(tx_req->skb); 623 ++priv->tx_tail; 624 --priv->tx_outstanding; 625 } 626 627 for (i = 0; i < ipoib_recvq_size; ++i) { 628 struct ipoib_rx_buf *rx_req; 629 630 rx_req = &priv->rx_ring[i]; 631 if (!rx_req->skb) 632 continue; 633 ib_dma_unmap_single(priv->ca, 634 rx_req->mapping, 635 IPOIB_BUF_SIZE, 636 DMA_FROM_DEVICE); 637 dev_kfree_skb_any(rx_req->skb); 638 rx_req->skb = NULL; 639 } 640 641 goto timeout; 642 } 643 644 ipoib_drain_cq(dev); 645 646 msleep(1); 647 } 648 649 ipoib_dbg(priv, "All sends and receives done.\n"); 650 651 timeout: 652 qp_attr.qp_state = IB_QPS_RESET; 653 if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE)) 654 ipoib_warn(priv, "Failed to modify QP to RESET state\n"); 655 656 /* Wait for all AHs to be reaped */ 657 set_bit(IPOIB_STOP_REAPER, &priv->flags); 658 cancel_delayed_work(&priv->ah_reap_task); 659 if (flush) 660 flush_workqueue(ipoib_workqueue); 661 662 begin = jiffies; 663 664 while (!list_empty(&priv->dead_ahs)) { 665 __ipoib_reap_ah(dev); 666 667 if (time_after(jiffies, begin + HZ)) { 668 ipoib_warn(priv, "timing out; will leak address handles\n"); 669 break; 670 } 671 672 msleep(1); 673 } 674 675 ib_req_notify_cq(priv->cq, IB_CQ_NEXT_COMP); 676 677 return 0; 678 } 679 680 int ipoib_ib_dev_init(struct net_device *dev, struct ib_device *ca, int port) 681 { 682 struct ipoib_dev_priv *priv = netdev_priv(dev); 683 684 priv->ca = ca; 685 priv->port = port; 686 priv->qp = NULL; 687 688 if (ipoib_transport_dev_init(dev, ca)) { 689 printk(KERN_WARNING "%s: ipoib_transport_dev_init failed\n", ca->name); 690 return -ENODEV; 691 } 692 693 if (dev->flags & IFF_UP) { 694 if (ipoib_ib_dev_open(dev)) { 695 ipoib_transport_dev_cleanup(dev); 696 return -ENODEV; 697 } 698 } 699 700 return 0; 701 } 702 703 static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv, int pkey_event) 704 { 705 struct ipoib_dev_priv *cpriv; 706 struct net_device *dev = priv->dev; 707 u16 new_index; 708 709 mutex_lock(&priv->vlan_mutex); 710 711 /* 712 * Flush any child interfaces too -- they might be up even if 713 * the parent is down. 714 */ 715 list_for_each_entry(cpriv, &priv->child_intfs, list) 716 __ipoib_ib_dev_flush(cpriv, pkey_event); 717 718 mutex_unlock(&priv->vlan_mutex); 719 720 if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) { 721 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n"); 722 return; 723 } 724 725 if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) { 726 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n"); 727 return; 728 } 729 730 if (pkey_event) { 731 if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &new_index)) { 732 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags); 733 ipoib_ib_dev_down(dev, 0); 734 ipoib_pkey_dev_delay_open(dev); 735 return; 736 } 737 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags); 738 739 /* restart QP only if P_Key index is changed */ 740 if (new_index == priv->pkey_index) { 741 ipoib_dbg(priv, "Not flushing - P_Key index not changed.\n"); 742 return; 743 } 744 priv->pkey_index = new_index; 745 } 746 747 ipoib_dbg(priv, "flushing\n"); 748 749 ipoib_ib_dev_down(dev, 0); 750 751 if (pkey_event) { 752 ipoib_ib_dev_stop(dev, 0); 753 ipoib_ib_dev_open(dev); 754 } 755 756 /* 757 * The device could have been brought down between the start and when 758 * we get here, don't bring it back up if it's not configured up 759 */ 760 if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) { 761 ipoib_ib_dev_up(dev); 762 ipoib_mcast_restart_task(&priv->restart_task); 763 } 764 } 765 766 void ipoib_ib_dev_flush(struct work_struct *work) 767 { 768 struct ipoib_dev_priv *priv = 769 container_of(work, struct ipoib_dev_priv, flush_task); 770 771 ipoib_dbg(priv, "Flushing %s\n", priv->dev->name); 772 __ipoib_ib_dev_flush(priv, 0); 773 } 774 775 void ipoib_pkey_event(struct work_struct *work) 776 { 777 struct ipoib_dev_priv *priv = 778 container_of(work, struct ipoib_dev_priv, pkey_event_task); 779 780 ipoib_dbg(priv, "Flushing %s and restarting its QP\n", priv->dev->name); 781 __ipoib_ib_dev_flush(priv, 1); 782 } 783 784 void ipoib_ib_dev_cleanup(struct net_device *dev) 785 { 786 struct ipoib_dev_priv *priv = netdev_priv(dev); 787 788 ipoib_dbg(priv, "cleaning up ib_dev\n"); 789 790 ipoib_mcast_stop_thread(dev, 1); 791 ipoib_mcast_dev_flush(dev); 792 793 ipoib_transport_dev_cleanup(dev); 794 } 795 796 /* 797 * Delayed P_Key Assigment Interim Support 798 * 799 * The following is initial implementation of delayed P_Key assigment 800 * mechanism. It is using the same approach implemented for the multicast 801 * group join. The single goal of this implementation is to quickly address 802 * Bug #2507. This implementation will probably be removed when the P_Key 803 * change async notification is available. 804 */ 805 806 void ipoib_pkey_poll(struct work_struct *work) 807 { 808 struct ipoib_dev_priv *priv = 809 container_of(work, struct ipoib_dev_priv, pkey_poll_task.work); 810 struct net_device *dev = priv->dev; 811 812 ipoib_pkey_dev_check_presence(dev); 813 814 if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) 815 ipoib_open(dev); 816 else { 817 mutex_lock(&pkey_mutex); 818 if (!test_bit(IPOIB_PKEY_STOP, &priv->flags)) 819 queue_delayed_work(ipoib_workqueue, 820 &priv->pkey_poll_task, 821 HZ); 822 mutex_unlock(&pkey_mutex); 823 } 824 } 825 826 int ipoib_pkey_dev_delay_open(struct net_device *dev) 827 { 828 struct ipoib_dev_priv *priv = netdev_priv(dev); 829 830 /* Look for the interface pkey value in the IB Port P_Key table and */ 831 /* set the interface pkey assigment flag */ 832 ipoib_pkey_dev_check_presence(dev); 833 834 /* P_Key value not assigned yet - start polling */ 835 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) { 836 mutex_lock(&pkey_mutex); 837 clear_bit(IPOIB_PKEY_STOP, &priv->flags); 838 queue_delayed_work(ipoib_workqueue, 839 &priv->pkey_poll_task, 840 HZ); 841 mutex_unlock(&pkey_mutex); 842 return 1; 843 } 844 845 return 0; 846 } 847