ipoib_ib.c revision 2a1d9b7f09aaaacf235656cb32a40ba2c79590b3
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 <ib_cache.h> 42 43#include "ipoib.h" 44 45#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA 46static int data_debug_level; 47 48module_param(data_debug_level, int, 0644); 49MODULE_PARM_DESC(data_debug_level, 50 "Enable data path debug tracing if > 0"); 51#endif 52 53#define IPOIB_OP_RECV (1ul << 31) 54 55static DECLARE_MUTEX(pkey_sem); 56 57struct ipoib_ah *ipoib_create_ah(struct net_device *dev, 58 struct ib_pd *pd, struct ib_ah_attr *attr) 59{ 60 struct ipoib_ah *ah; 61 62 ah = kmalloc(sizeof *ah, GFP_KERNEL); 63 if (!ah) 64 return NULL; 65 66 ah->dev = dev; 67 ah->last_send = 0; 68 kref_init(&ah->ref); 69 70 ah->ah = ib_create_ah(pd, attr); 71 if (IS_ERR(ah->ah)) { 72 kfree(ah); 73 ah = NULL; 74 } else 75 ipoib_dbg(netdev_priv(dev), "Created ah %p\n", ah->ah); 76 77 return ah; 78} 79 80void ipoib_free_ah(struct kref *kref) 81{ 82 struct ipoib_ah *ah = container_of(kref, struct ipoib_ah, ref); 83 struct ipoib_dev_priv *priv = netdev_priv(ah->dev); 84 85 unsigned long flags; 86 87 if ((int) priv->tx_tail - (int) ah->last_send >= 0) { 88 ipoib_dbg(priv, "Freeing ah %p\n", ah->ah); 89 ib_destroy_ah(ah->ah); 90 kfree(ah); 91 } else { 92 spin_lock_irqsave(&priv->lock, flags); 93 list_add_tail(&ah->list, &priv->dead_ahs); 94 spin_unlock_irqrestore(&priv->lock, flags); 95 } 96} 97 98static inline int ipoib_ib_receive(struct ipoib_dev_priv *priv, 99 unsigned int wr_id, 100 dma_addr_t addr) 101{ 102 struct ib_sge list = { 103 .addr = addr, 104 .length = IPOIB_BUF_SIZE, 105 .lkey = priv->mr->lkey, 106 }; 107 struct ib_recv_wr param = { 108 .wr_id = wr_id | IPOIB_OP_RECV, 109 .sg_list = &list, 110 .num_sge = 1, 111 }; 112 struct ib_recv_wr *bad_wr; 113 114 return ib_post_recv(priv->qp, ¶m, &bad_wr); 115} 116 117static int ipoib_ib_post_receive(struct net_device *dev, int id) 118{ 119 struct ipoib_dev_priv *priv = netdev_priv(dev); 120 struct sk_buff *skb; 121 dma_addr_t addr; 122 int ret; 123 124 skb = dev_alloc_skb(IPOIB_BUF_SIZE + 4); 125 if (!skb) { 126 ipoib_warn(priv, "failed to allocate receive buffer\n"); 127 128 priv->rx_ring[id].skb = NULL; 129 return -ENOMEM; 130 } 131 skb_reserve(skb, 4); /* 16 byte align IP header */ 132 priv->rx_ring[id].skb = skb; 133 addr = dma_map_single(priv->ca->dma_device, 134 skb->data, IPOIB_BUF_SIZE, 135 DMA_FROM_DEVICE); 136 pci_unmap_addr_set(&priv->rx_ring[id], mapping, addr); 137 138 ret = ipoib_ib_receive(priv, id, addr); 139 if (ret) { 140 ipoib_warn(priv, "ipoib_ib_receive failed for buf %d (%d)\n", 141 id, ret); 142 dma_unmap_single(priv->ca->dma_device, addr, 143 IPOIB_BUF_SIZE, DMA_FROM_DEVICE); 144 dev_kfree_skb_any(skb); 145 priv->rx_ring[id].skb = NULL; 146 } 147 148 return ret; 149} 150 151static int ipoib_ib_post_receives(struct net_device *dev) 152{ 153 struct ipoib_dev_priv *priv = netdev_priv(dev); 154 int i; 155 156 for (i = 0; i < IPOIB_RX_RING_SIZE; ++i) { 157 if (ipoib_ib_post_receive(dev, i)) { 158 ipoib_warn(priv, "ipoib_ib_post_receive failed for buf %d\n", i); 159 return -EIO; 160 } 161 } 162 163 return 0; 164} 165 166static void ipoib_ib_handle_wc(struct net_device *dev, 167 struct ib_wc *wc) 168{ 169 struct ipoib_dev_priv *priv = netdev_priv(dev); 170 unsigned int wr_id = wc->wr_id; 171 172 ipoib_dbg_data(priv, "called: id %d, op %d, status: %d\n", 173 wr_id, wc->opcode, wc->status); 174 175 if (wr_id & IPOIB_OP_RECV) { 176 wr_id &= ~IPOIB_OP_RECV; 177 178 if (wr_id < IPOIB_RX_RING_SIZE) { 179 struct sk_buff *skb = priv->rx_ring[wr_id].skb; 180 181 priv->rx_ring[wr_id].skb = NULL; 182 183 dma_unmap_single(priv->ca->dma_device, 184 pci_unmap_addr(&priv->rx_ring[wr_id], 185 mapping), 186 IPOIB_BUF_SIZE, 187 DMA_FROM_DEVICE); 188 189 if (wc->status != IB_WC_SUCCESS) { 190 if (wc->status != IB_WC_WR_FLUSH_ERR) 191 ipoib_warn(priv, "failed recv event " 192 "(status=%d, wrid=%d vend_err %x)\n", 193 wc->status, wr_id, wc->vendor_err); 194 dev_kfree_skb_any(skb); 195 return; 196 } 197 198 ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n", 199 wc->byte_len, wc->slid); 200 201 skb_put(skb, wc->byte_len); 202 skb_pull(skb, IB_GRH_BYTES); 203 204 if (wc->slid != priv->local_lid || 205 wc->src_qp != priv->qp->qp_num) { 206 skb->protocol = ((struct ipoib_header *) skb->data)->proto; 207 skb->mac.raw = skb->data; 208 skb_pull(skb, IPOIB_ENCAP_LEN); 209 210 dev->last_rx = jiffies; 211 ++priv->stats.rx_packets; 212 priv->stats.rx_bytes += skb->len; 213 214 skb->dev = dev; 215 /* XXX get correct PACKET_ type here */ 216 skb->pkt_type = PACKET_HOST; 217 netif_rx_ni(skb); 218 } else { 219 ipoib_dbg_data(priv, "dropping loopback packet\n"); 220 dev_kfree_skb_any(skb); 221 } 222 223 /* repost receive */ 224 if (ipoib_ib_post_receive(dev, wr_id)) 225 ipoib_warn(priv, "ipoib_ib_post_receive failed " 226 "for buf %d\n", wr_id); 227 } else 228 ipoib_warn(priv, "completion event with wrid %d\n", 229 wr_id); 230 231 } else { 232 struct ipoib_buf *tx_req; 233 unsigned long flags; 234 235 if (wr_id >= IPOIB_TX_RING_SIZE) { 236 ipoib_warn(priv, "completion event with wrid %d (> %d)\n", 237 wr_id, IPOIB_TX_RING_SIZE); 238 return; 239 } 240 241 ipoib_dbg_data(priv, "send complete, wrid %d\n", wr_id); 242 243 tx_req = &priv->tx_ring[wr_id]; 244 245 dma_unmap_single(priv->ca->dma_device, 246 pci_unmap_addr(tx_req, mapping), 247 tx_req->skb->len, 248 DMA_TO_DEVICE); 249 250 ++priv->stats.tx_packets; 251 priv->stats.tx_bytes += tx_req->skb->len; 252 253 dev_kfree_skb_any(tx_req->skb); 254 255 spin_lock_irqsave(&priv->tx_lock, flags); 256 ++priv->tx_tail; 257 if (netif_queue_stopped(dev) && 258 priv->tx_head - priv->tx_tail <= IPOIB_TX_RING_SIZE / 2) 259 netif_wake_queue(dev); 260 spin_unlock_irqrestore(&priv->tx_lock, flags); 261 262 if (wc->status != IB_WC_SUCCESS && 263 wc->status != IB_WC_WR_FLUSH_ERR) 264 ipoib_warn(priv, "failed send event " 265 "(status=%d, wrid=%d vend_err %x)\n", 266 wc->status, wr_id, wc->vendor_err); 267 } 268} 269 270void ipoib_ib_completion(struct ib_cq *cq, void *dev_ptr) 271{ 272 struct net_device *dev = (struct net_device *) dev_ptr; 273 struct ipoib_dev_priv *priv = netdev_priv(dev); 274 int n, i; 275 276 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP); 277 do { 278 n = ib_poll_cq(cq, IPOIB_NUM_WC, priv->ibwc); 279 for (i = 0; i < n; ++i) 280 ipoib_ib_handle_wc(dev, priv->ibwc + i); 281 } while (n == IPOIB_NUM_WC); 282} 283 284static inline int post_send(struct ipoib_dev_priv *priv, 285 unsigned int wr_id, 286 struct ib_ah *address, u32 qpn, 287 dma_addr_t addr, int len) 288{ 289 struct ib_send_wr *bad_wr; 290 291 priv->tx_sge.addr = addr; 292 priv->tx_sge.length = len; 293 294 priv->tx_wr.wr_id = wr_id; 295 priv->tx_wr.wr.ud.remote_qpn = qpn; 296 priv->tx_wr.wr.ud.ah = address; 297 298 return ib_post_send(priv->qp, &priv->tx_wr, &bad_wr); 299} 300 301void ipoib_send(struct net_device *dev, struct sk_buff *skb, 302 struct ipoib_ah *address, u32 qpn) 303{ 304 struct ipoib_dev_priv *priv = netdev_priv(dev); 305 struct ipoib_buf *tx_req; 306 dma_addr_t addr; 307 308 if (skb->len > dev->mtu + INFINIBAND_ALEN) { 309 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n", 310 skb->len, dev->mtu + INFINIBAND_ALEN); 311 ++priv->stats.tx_dropped; 312 ++priv->stats.tx_errors; 313 dev_kfree_skb_any(skb); 314 return; 315 } 316 317 ipoib_dbg_data(priv, "sending packet, length=%d address=%p qpn=0x%06x\n", 318 skb->len, address, qpn); 319 320 /* 321 * We put the skb into the tx_ring _before_ we call post_send() 322 * because it's entirely possible that the completion handler will 323 * run before we execute anything after the post_send(). That 324 * means we have to make sure everything is properly recorded and 325 * our state is consistent before we call post_send(). 326 */ 327 tx_req = &priv->tx_ring[priv->tx_head & (IPOIB_TX_RING_SIZE - 1)]; 328 tx_req->skb = skb; 329 addr = dma_map_single(priv->ca->dma_device, skb->data, skb->len, 330 DMA_TO_DEVICE); 331 pci_unmap_addr_set(tx_req, mapping, addr); 332 333 if (unlikely(post_send(priv, priv->tx_head & (IPOIB_TX_RING_SIZE - 1), 334 address->ah, qpn, addr, skb->len))) { 335 ipoib_warn(priv, "post_send failed\n"); 336 ++priv->stats.tx_errors; 337 dma_unmap_single(priv->ca->dma_device, addr, skb->len, 338 DMA_TO_DEVICE); 339 dev_kfree_skb_any(skb); 340 } else { 341 dev->trans_start = jiffies; 342 343 address->last_send = priv->tx_head; 344 ++priv->tx_head; 345 346 if (priv->tx_head - priv->tx_tail == IPOIB_TX_RING_SIZE) { 347 ipoib_dbg(priv, "TX ring full, stopping kernel net queue\n"); 348 netif_stop_queue(dev); 349 } 350 } 351} 352 353static void __ipoib_reap_ah(struct net_device *dev) 354{ 355 struct ipoib_dev_priv *priv = netdev_priv(dev); 356 struct ipoib_ah *ah, *tah; 357 LIST_HEAD(remove_list); 358 359 spin_lock_irq(&priv->lock); 360 list_for_each_entry_safe(ah, tah, &priv->dead_ahs, list) 361 if ((int) priv->tx_tail - (int) ah->last_send >= 0) { 362 list_del(&ah->list); 363 list_add_tail(&ah->list, &remove_list); 364 } 365 spin_unlock_irq(&priv->lock); 366 367 list_for_each_entry_safe(ah, tah, &remove_list, list) { 368 ipoib_dbg(priv, "Reaping ah %p\n", ah->ah); 369 ib_destroy_ah(ah->ah); 370 kfree(ah); 371 } 372} 373 374void ipoib_reap_ah(void *dev_ptr) 375{ 376 struct net_device *dev = dev_ptr; 377 struct ipoib_dev_priv *priv = netdev_priv(dev); 378 379 __ipoib_reap_ah(dev); 380 381 if (!test_bit(IPOIB_STOP_REAPER, &priv->flags)) 382 queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task, HZ); 383} 384 385int ipoib_ib_dev_open(struct net_device *dev) 386{ 387 struct ipoib_dev_priv *priv = netdev_priv(dev); 388 int ret; 389 390 ret = ipoib_qp_create(dev); 391 if (ret) { 392 ipoib_warn(priv, "ipoib_qp_create returned %d\n", ret); 393 return -1; 394 } 395 396 ret = ipoib_ib_post_receives(dev); 397 if (ret) { 398 ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret); 399 return -1; 400 } 401 402 clear_bit(IPOIB_STOP_REAPER, &priv->flags); 403 queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task, HZ); 404 405 return 0; 406} 407 408int ipoib_ib_dev_up(struct net_device *dev) 409{ 410 struct ipoib_dev_priv *priv = netdev_priv(dev); 411 412 set_bit(IPOIB_FLAG_OPER_UP, &priv->flags); 413 414 return ipoib_mcast_start_thread(dev); 415} 416 417int ipoib_ib_dev_down(struct net_device *dev) 418{ 419 struct ipoib_dev_priv *priv = netdev_priv(dev); 420 421 ipoib_dbg(priv, "downing ib_dev\n"); 422 423 clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags); 424 netif_carrier_off(dev); 425 426 /* Shutdown the P_Key thread if still active */ 427 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) { 428 down(&pkey_sem); 429 set_bit(IPOIB_PKEY_STOP, &priv->flags); 430 cancel_delayed_work(&priv->pkey_task); 431 up(&pkey_sem); 432 flush_workqueue(ipoib_workqueue); 433 } 434 435 ipoib_mcast_stop_thread(dev); 436 437 /* 438 * Flush the multicast groups first so we stop any multicast joins. The 439 * completion thread may have already died and we may deadlock waiting 440 * for the completion thread to finish some multicast joins. 441 */ 442 ipoib_mcast_dev_flush(dev); 443 444 /* Delete broadcast and local addresses since they will be recreated */ 445 ipoib_mcast_dev_down(dev); 446 447 ipoib_flush_paths(dev); 448 449 return 0; 450} 451 452static int recvs_pending(struct net_device *dev) 453{ 454 struct ipoib_dev_priv *priv = netdev_priv(dev); 455 int pending = 0; 456 int i; 457 458 for (i = 0; i < IPOIB_RX_RING_SIZE; ++i) 459 if (priv->rx_ring[i].skb) 460 ++pending; 461 462 return pending; 463} 464 465int ipoib_ib_dev_stop(struct net_device *dev) 466{ 467 struct ipoib_dev_priv *priv = netdev_priv(dev); 468 struct ib_qp_attr qp_attr; 469 int attr_mask; 470 unsigned long begin; 471 struct ipoib_buf *tx_req; 472 int i; 473 474 /* Kill the existing QP and allocate a new one */ 475 qp_attr.qp_state = IB_QPS_ERR; 476 attr_mask = IB_QP_STATE; 477 if (ib_modify_qp(priv->qp, &qp_attr, attr_mask)) 478 ipoib_warn(priv, "Failed to modify QP to ERROR state\n"); 479 480 /* Wait for all sends and receives to complete */ 481 begin = jiffies; 482 483 while (priv->tx_head != priv->tx_tail || recvs_pending(dev)) { 484 if (time_after(jiffies, begin + 5 * HZ)) { 485 ipoib_warn(priv, "timing out; %d sends %d receives not completed\n", 486 priv->tx_head - priv->tx_tail, recvs_pending(dev)); 487 488 /* 489 * assume the HW is wedged and just free up 490 * all our pending work requests. 491 */ 492 while ((int) priv->tx_tail - (int) priv->tx_head < 0) { 493 tx_req = &priv->tx_ring[priv->tx_tail & 494 (IPOIB_TX_RING_SIZE - 1)]; 495 dma_unmap_single(priv->ca->dma_device, 496 pci_unmap_addr(tx_req, mapping), 497 tx_req->skb->len, 498 DMA_TO_DEVICE); 499 dev_kfree_skb_any(tx_req->skb); 500 ++priv->tx_tail; 501 } 502 503 for (i = 0; i < IPOIB_RX_RING_SIZE; ++i) 504 if (priv->rx_ring[i].skb) { 505 dma_unmap_single(priv->ca->dma_device, 506 pci_unmap_addr(&priv->rx_ring[i], 507 mapping), 508 IPOIB_BUF_SIZE, 509 DMA_FROM_DEVICE); 510 dev_kfree_skb_any(priv->rx_ring[i].skb); 511 priv->rx_ring[i].skb = NULL; 512 } 513 514 goto timeout; 515 } 516 517 msleep(1); 518 } 519 520 ipoib_dbg(priv, "All sends and receives done.\n"); 521 522timeout: 523 qp_attr.qp_state = IB_QPS_RESET; 524 attr_mask = IB_QP_STATE; 525 if (ib_modify_qp(priv->qp, &qp_attr, attr_mask)) 526 ipoib_warn(priv, "Failed to modify QP to RESET state\n"); 527 528 /* Wait for all AHs to be reaped */ 529 set_bit(IPOIB_STOP_REAPER, &priv->flags); 530 cancel_delayed_work(&priv->ah_reap_task); 531 flush_workqueue(ipoib_workqueue); 532 533 begin = jiffies; 534 535 while (!list_empty(&priv->dead_ahs)) { 536 __ipoib_reap_ah(dev); 537 538 if (time_after(jiffies, begin + HZ)) { 539 ipoib_warn(priv, "timing out; will leak address handles\n"); 540 break; 541 } 542 543 msleep(1); 544 } 545 546 return 0; 547} 548 549int ipoib_ib_dev_init(struct net_device *dev, struct ib_device *ca, int port) 550{ 551 struct ipoib_dev_priv *priv = netdev_priv(dev); 552 553 priv->ca = ca; 554 priv->port = port; 555 priv->qp = NULL; 556 557 if (ipoib_transport_dev_init(dev, ca)) { 558 printk(KERN_WARNING "%s: ipoib_transport_dev_init failed\n", ca->name); 559 return -ENODEV; 560 } 561 562 if (dev->flags & IFF_UP) { 563 if (ipoib_ib_dev_open(dev)) { 564 ipoib_transport_dev_cleanup(dev); 565 return -ENODEV; 566 } 567 } 568 569 return 0; 570} 571 572void ipoib_ib_dev_flush(void *_dev) 573{ 574 struct net_device *dev = (struct net_device *)_dev; 575 struct ipoib_dev_priv *priv = netdev_priv(dev), *cpriv; 576 577 if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) 578 return; 579 580 ipoib_dbg(priv, "flushing\n"); 581 582 ipoib_ib_dev_down(dev); 583 584 /* 585 * The device could have been brought down between the start and when 586 * we get here, don't bring it back up if it's not configured up 587 */ 588 if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) 589 ipoib_ib_dev_up(dev); 590 591 /* Flush any child interfaces too */ 592 list_for_each_entry(cpriv, &priv->child_intfs, list) 593 ipoib_ib_dev_flush(&cpriv->dev); 594} 595 596void ipoib_ib_dev_cleanup(struct net_device *dev) 597{ 598 struct ipoib_dev_priv *priv = netdev_priv(dev); 599 600 ipoib_dbg(priv, "cleaning up ib_dev\n"); 601 602 ipoib_mcast_stop_thread(dev); 603 604 /* Delete the broadcast address and the local address */ 605 ipoib_mcast_dev_down(dev); 606 607 ipoib_transport_dev_cleanup(dev); 608} 609 610/* 611 * Delayed P_Key Assigment Interim Support 612 * 613 * The following is initial implementation of delayed P_Key assigment 614 * mechanism. It is using the same approach implemented for the multicast 615 * group join. The single goal of this implementation is to quickly address 616 * Bug #2507. This implementation will probably be removed when the P_Key 617 * change async notification is available. 618 */ 619int ipoib_open(struct net_device *dev); 620 621static void ipoib_pkey_dev_check_presence(struct net_device *dev) 622{ 623 struct ipoib_dev_priv *priv = netdev_priv(dev); 624 u16 pkey_index = 0; 625 626 if (ib_find_cached_pkey(priv->ca, priv->port, priv->pkey, &pkey_index)) 627 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags); 628 else 629 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags); 630} 631 632void ipoib_pkey_poll(void *dev_ptr) 633{ 634 struct net_device *dev = dev_ptr; 635 struct ipoib_dev_priv *priv = netdev_priv(dev); 636 637 ipoib_pkey_dev_check_presence(dev); 638 639 if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) 640 ipoib_open(dev); 641 else { 642 down(&pkey_sem); 643 if (!test_bit(IPOIB_PKEY_STOP, &priv->flags)) 644 queue_delayed_work(ipoib_workqueue, 645 &priv->pkey_task, 646 HZ); 647 up(&pkey_sem); 648 } 649} 650 651int ipoib_pkey_dev_delay_open(struct net_device *dev) 652{ 653 struct ipoib_dev_priv *priv = netdev_priv(dev); 654 655 /* Look for the interface pkey value in the IB Port P_Key table and */ 656 /* set the interface pkey assigment flag */ 657 ipoib_pkey_dev_check_presence(dev); 658 659 /* P_Key value not assigned yet - start polling */ 660 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) { 661 down(&pkey_sem); 662 clear_bit(IPOIB_PKEY_STOP, &priv->flags); 663 queue_delayed_work(ipoib_workqueue, 664 &priv->pkey_task, 665 HZ); 666 up(&pkey_sem); 667 return 1; 668 } 669 670 return 0; 671} 672