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 36 #include <linux/delay.h> 37 #include <linux/moduleparam.h> 38 #include <linux/dma-mapping.h> 39 #include <linux/slab.h> 40 41 #include <linux/ip.h> 42 #include <linux/tcp.h> 43 #include <rdma/ib_cache.h> 44 45 #include "ipoib.h" 46 47 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA 48 static int data_debug_level; 49 50 module_param(data_debug_level, int, 0644); 51 MODULE_PARM_DESC(data_debug_level, 52 "Enable data path debug tracing if > 0"); 53 #endif 54 55 struct ipoib_ah *ipoib_create_ah(struct net_device *dev, 56 struct ib_pd *pd, struct rdma_ah_attr *attr) 57 { 58 struct ipoib_ah *ah; 59 struct ib_ah *vah; 60 61 ah = kmalloc(sizeof(*ah), GFP_KERNEL); 62 if (!ah) 63 return ERR_PTR(-ENOMEM); 64 65 ah->dev = dev; 66 ah->last_send = 0; 67 kref_init(&ah->ref); 68 69 vah = rdma_create_ah(pd, attr, RDMA_CREATE_AH_SLEEPABLE); 70 if (IS_ERR(vah)) { 71 kfree(ah); 72 ah = (struct ipoib_ah *)vah; 73 } else { 74 ah->ah = vah; 75 ipoib_dbg(ipoib_priv(dev), "Created ah %p\n", ah->ah); 76 } 77 78 return ah; 79 } 80 81 void ipoib_free_ah(struct kref *kref) 82 { 83 struct ipoib_ah *ah = container_of(kref, struct ipoib_ah, ref); 84 struct ipoib_dev_priv *priv = ipoib_priv(ah->dev); 85 86 unsigned long flags; 87 88 spin_lock_irqsave(&priv->lock, flags); 89 list_add_tail(&ah->list, &priv->dead_ahs); 90 spin_unlock_irqrestore(&priv->lock, flags); 91 } 92 93 static void ipoib_ud_dma_unmap_rx(struct ipoib_dev_priv *priv, 94 u64 mapping[IPOIB_UD_RX_SG]) 95 { 96 ib_dma_unmap_single(priv->ca, mapping[0], 97 IPOIB_UD_BUF_SIZE(priv->max_ib_mtu), 98 DMA_FROM_DEVICE); 99 } 100 101 static int ipoib_ib_post_receive(struct net_device *dev, int id) 102 { 103 struct ipoib_dev_priv *priv = ipoib_priv(dev); 104 int ret; 105 106 priv->rx_wr.wr_id = id | IPOIB_OP_RECV; 107 priv->rx_sge[0].addr = priv->rx_ring[id].mapping[0]; 108 priv->rx_sge[1].addr = priv->rx_ring[id].mapping[1]; 109 110 111 ret = ib_post_recv(priv->qp, &priv->rx_wr, NULL); 112 if (unlikely(ret)) { 113 ipoib_warn(priv, "receive failed for buf %d (%d)\n", id, ret); 114 ipoib_ud_dma_unmap_rx(priv, priv->rx_ring[id].mapping); 115 dev_kfree_skb_any(priv->rx_ring[id].skb); 116 priv->rx_ring[id].skb = NULL; 117 } 118 119 return ret; 120 } 121 122 static struct sk_buff *ipoib_alloc_rx_skb(struct net_device *dev, int id) 123 { 124 struct ipoib_dev_priv *priv = ipoib_priv(dev); 125 struct sk_buff *skb; 126 int buf_size; 127 u64 *mapping; 128 129 buf_size = IPOIB_UD_BUF_SIZE(priv->max_ib_mtu); 130 131 skb = dev_alloc_skb(buf_size + IPOIB_HARD_LEN); 132 if (unlikely(!skb)) 133 return NULL; 134 135 /* 136 * the IP header will be at IPOIP_HARD_LEN + IB_GRH_BYTES, that is 137 * 64 bytes aligned 138 */ 139 skb_reserve(skb, sizeof(struct ipoib_pseudo_header)); 140 141 mapping = priv->rx_ring[id].mapping; 142 mapping[0] = ib_dma_map_single(priv->ca, skb->data, buf_size, 143 DMA_FROM_DEVICE); 144 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0]))) 145 goto error; 146 147 priv->rx_ring[id].skb = skb; 148 return skb; 149 error: 150 dev_kfree_skb_any(skb); 151 return NULL; 152 } 153 154 static int ipoib_ib_post_receives(struct net_device *dev) 155 { 156 struct ipoib_dev_priv *priv = ipoib_priv(dev); 157 int i; 158 159 for (i = 0; i < ipoib_recvq_size; ++i) { 160 if (!ipoib_alloc_rx_skb(dev, i)) { 161 ipoib_warn(priv, "failed to allocate receive buffer %d\n", i); 162 return -ENOMEM; 163 } 164 if (ipoib_ib_post_receive(dev, i)) { 165 ipoib_warn(priv, "ipoib_ib_post_receive failed for buf %d\n", i); 166 return -EIO; 167 } 168 } 169 170 return 0; 171 } 172 173 static void ipoib_ib_handle_rx_wc(struct net_device *dev, struct ib_wc *wc) 174 { 175 struct ipoib_dev_priv *priv = ipoib_priv(dev); 176 unsigned int wr_id = wc->wr_id & ~IPOIB_OP_RECV; 177 struct sk_buff *skb; 178 u64 mapping[IPOIB_UD_RX_SG]; 179 union ib_gid *dgid; 180 union ib_gid *sgid; 181 182 ipoib_dbg_data(priv, "recv completion: id %d, status: %d\n", 183 wr_id, wc->status); 184 185 if (unlikely(wr_id >= ipoib_recvq_size)) { 186 ipoib_warn(priv, "recv completion event with wrid %d (> %d)\n", 187 wr_id, ipoib_recvq_size); 188 return; 189 } 190 191 skb = priv->rx_ring[wr_id].skb; 192 193 if (unlikely(wc->status != IB_WC_SUCCESS)) { 194 if (wc->status != IB_WC_WR_FLUSH_ERR) 195 ipoib_warn(priv, 196 "failed recv event (status=%d, wrid=%d vend_err %#x)\n", 197 wc->status, wr_id, wc->vendor_err); 198 ipoib_ud_dma_unmap_rx(priv, priv->rx_ring[wr_id].mapping); 199 dev_kfree_skb_any(skb); 200 priv->rx_ring[wr_id].skb = NULL; 201 return; 202 } 203 204 memcpy(mapping, priv->rx_ring[wr_id].mapping, 205 IPOIB_UD_RX_SG * sizeof(*mapping)); 206 207 /* 208 * If we can't allocate a new RX buffer, dump 209 * this packet and reuse the old buffer. 210 */ 211 if (unlikely(!ipoib_alloc_rx_skb(dev, wr_id))) { 212 ++dev->stats.rx_dropped; 213 goto repost; 214 } 215 216 ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n", 217 wc->byte_len, wc->slid); 218 219 ipoib_ud_dma_unmap_rx(priv, mapping); 220 221 skb_put(skb, wc->byte_len); 222 223 /* First byte of dgid signals multicast when 0xff */ 224 dgid = &((struct ib_grh *)skb->data)->dgid; 225 226 if (!(wc->wc_flags & IB_WC_GRH) || dgid->raw[0] != 0xff) 227 skb->pkt_type = PACKET_HOST; 228 else if (memcmp(dgid, dev->broadcast + 4, sizeof(union ib_gid)) == 0) 229 skb->pkt_type = PACKET_BROADCAST; 230 else 231 skb->pkt_type = PACKET_MULTICAST; 232 233 sgid = &((struct ib_grh *)skb->data)->sgid; 234 235 /* 236 * Drop packets that this interface sent, ie multicast packets 237 * that the HCA has replicated. 238 */ 239 if (wc->slid == priv->local_lid && wc->src_qp == priv->qp->qp_num) { 240 int need_repost = 1; 241 242 if ((wc->wc_flags & IB_WC_GRH) && 243 sgid->global.interface_id != priv->local_gid.global.interface_id) 244 need_repost = 0; 245 246 if (need_repost) { 247 dev_kfree_skb_any(skb); 248 goto repost; 249 } 250 } 251 252 skb_pull(skb, IB_GRH_BYTES); 253 254 skb->protocol = ((struct ipoib_header *) skb->data)->proto; 255 skb_add_pseudo_hdr(skb); 256 257 ++dev->stats.rx_packets; 258 dev->stats.rx_bytes += skb->len; 259 if (skb->pkt_type == PACKET_MULTICAST) 260 dev->stats.multicast++; 261 262 skb->dev = dev; 263 if ((dev->features & NETIF_F_RXCSUM) && 264 likely(wc->wc_flags & IB_WC_IP_CSUM_OK)) 265 skb->ip_summed = CHECKSUM_UNNECESSARY; 266 267 napi_gro_receive(&priv->recv_napi, skb); 268 269 repost: 270 if (unlikely(ipoib_ib_post_receive(dev, wr_id))) 271 ipoib_warn(priv, "ipoib_ib_post_receive failed " 272 "for buf %d\n", wr_id); 273 } 274 275 int ipoib_dma_map_tx(struct ib_device *ca, struct ipoib_tx_buf *tx_req) 276 { 277 struct sk_buff *skb = tx_req->skb; 278 u64 *mapping = tx_req->mapping; 279 int i; 280 int off; 281 282 if (skb_headlen(skb)) { 283 mapping[0] = ib_dma_map_single(ca, skb->data, skb_headlen(skb), 284 DMA_TO_DEVICE); 285 if (unlikely(ib_dma_mapping_error(ca, mapping[0]))) 286 return -EIO; 287 288 off = 1; 289 } else 290 off = 0; 291 292 for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) { 293 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 294 mapping[i + off] = ib_dma_map_page(ca, 295 skb_frag_page(frag), 296 frag->page_offset, skb_frag_size(frag), 297 DMA_TO_DEVICE); 298 if (unlikely(ib_dma_mapping_error(ca, mapping[i + off]))) 299 goto partial_error; 300 } 301 return 0; 302 303 partial_error: 304 for (; i > 0; --i) { 305 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i - 1]; 306 307 ib_dma_unmap_page(ca, mapping[i - !off], skb_frag_size(frag), DMA_TO_DEVICE); 308 } 309 310 if (off) 311 ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE); 312 313 return -EIO; 314 } 315 316 void ipoib_dma_unmap_tx(struct ipoib_dev_priv *priv, 317 struct ipoib_tx_buf *tx_req) 318 { 319 struct sk_buff *skb = tx_req->skb; 320 u64 *mapping = tx_req->mapping; 321 int i; 322 int off; 323 324 if (skb_headlen(skb)) { 325 ib_dma_unmap_single(priv->ca, mapping[0], skb_headlen(skb), 326 DMA_TO_DEVICE); 327 off = 1; 328 } else 329 off = 0; 330 331 for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) { 332 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 333 334 ib_dma_unmap_page(priv->ca, mapping[i + off], 335 skb_frag_size(frag), DMA_TO_DEVICE); 336 } 337 } 338 339 /* 340 * As the result of a completion error the QP Can be transferred to SQE states. 341 * The function checks if the (send)QP is in SQE state and 342 * moves it back to RTS state, that in order to have it functional again. 343 */ 344 static void ipoib_qp_state_validate_work(struct work_struct *work) 345 { 346 struct ipoib_qp_state_validate *qp_work = 347 container_of(work, struct ipoib_qp_state_validate, work); 348 349 struct ipoib_dev_priv *priv = qp_work->priv; 350 struct ib_qp_attr qp_attr; 351 struct ib_qp_init_attr query_init_attr; 352 int ret; 353 354 ret = ib_query_qp(priv->qp, &qp_attr, IB_QP_STATE, &query_init_attr); 355 if (ret) { 356 ipoib_warn(priv, "%s: Failed to query QP ret: %d\n", 357 __func__, ret); 358 goto free_res; 359 } 360 pr_info("%s: QP: 0x%x is in state: %d\n", 361 __func__, priv->qp->qp_num, qp_attr.qp_state); 362 363 /* currently support only in SQE->RTS transition*/ 364 if (qp_attr.qp_state == IB_QPS_SQE) { 365 qp_attr.qp_state = IB_QPS_RTS; 366 367 ret = ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE); 368 if (ret) { 369 pr_warn("failed(%d) modify QP:0x%x SQE->RTS\n", 370 ret, priv->qp->qp_num); 371 goto free_res; 372 } 373 pr_info("%s: QP: 0x%x moved from IB_QPS_SQE to IB_QPS_RTS\n", 374 __func__, priv->qp->qp_num); 375 } else { 376 pr_warn("QP (%d) will stay in state: %d\n", 377 priv->qp->qp_num, qp_attr.qp_state); 378 } 379 380 free_res: 381 kfree(qp_work); 382 } 383 384 static void ipoib_ib_handle_tx_wc(struct net_device *dev, struct ib_wc *wc) 385 { 386 struct ipoib_dev_priv *priv = ipoib_priv(dev); 387 unsigned int wr_id = wc->wr_id; 388 struct ipoib_tx_buf *tx_req; 389 390 ipoib_dbg_data(priv, "send completion: id %d, status: %d\n", 391 wr_id, wc->status); 392 393 if (unlikely(wr_id >= ipoib_sendq_size)) { 394 ipoib_warn(priv, "send completion event with wrid %d (> %d)\n", 395 wr_id, ipoib_sendq_size); 396 return; 397 } 398 399 tx_req = &priv->tx_ring[wr_id]; 400 401 ipoib_dma_unmap_tx(priv, tx_req); 402 403 ++dev->stats.tx_packets; 404 dev->stats.tx_bytes += tx_req->skb->len; 405 406 dev_kfree_skb_any(tx_req->skb); 407 408 ++priv->tx_tail; 409 410 if (unlikely(netif_queue_stopped(dev) && 411 ((priv->tx_head - priv->tx_tail) <= ipoib_sendq_size >> 1) && 412 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))) 413 netif_wake_queue(dev); 414 415 if (wc->status != IB_WC_SUCCESS && 416 wc->status != IB_WC_WR_FLUSH_ERR) { 417 struct ipoib_qp_state_validate *qp_work; 418 ipoib_warn(priv, 419 "failed send event (status=%d, wrid=%d vend_err %#x)\n", 420 wc->status, wr_id, wc->vendor_err); 421 qp_work = kzalloc(sizeof(*qp_work), GFP_ATOMIC); 422 if (!qp_work) 423 return; 424 425 INIT_WORK(&qp_work->work, ipoib_qp_state_validate_work); 426 qp_work->priv = priv; 427 queue_work(priv->wq, &qp_work->work); 428 } 429 } 430 431 static int poll_tx(struct ipoib_dev_priv *priv) 432 { 433 int n, i; 434 struct ib_wc *wc; 435 436 n = ib_poll_cq(priv->send_cq, MAX_SEND_CQE, priv->send_wc); 437 for (i = 0; i < n; ++i) { 438 wc = priv->send_wc + i; 439 if (wc->wr_id & IPOIB_OP_CM) 440 ipoib_cm_handle_tx_wc(priv->dev, priv->send_wc + i); 441 else 442 ipoib_ib_handle_tx_wc(priv->dev, priv->send_wc + i); 443 } 444 return n == MAX_SEND_CQE; 445 } 446 447 int ipoib_rx_poll(struct napi_struct *napi, int budget) 448 { 449 struct ipoib_dev_priv *priv = 450 container_of(napi, struct ipoib_dev_priv, recv_napi); 451 struct net_device *dev = priv->dev; 452 int done; 453 int t; 454 int n, i; 455 456 done = 0; 457 458 poll_more: 459 while (done < budget) { 460 int max = (budget - done); 461 462 t = min(IPOIB_NUM_WC, max); 463 n = ib_poll_cq(priv->recv_cq, t, priv->ibwc); 464 465 for (i = 0; i < n; i++) { 466 struct ib_wc *wc = priv->ibwc + i; 467 468 if (wc->wr_id & IPOIB_OP_RECV) { 469 ++done; 470 if (wc->wr_id & IPOIB_OP_CM) 471 ipoib_cm_handle_rx_wc(dev, wc); 472 else 473 ipoib_ib_handle_rx_wc(dev, wc); 474 } else { 475 pr_warn("%s: Got unexpected wqe id\n", __func__); 476 } 477 } 478 479 if (n != t) 480 break; 481 } 482 483 if (done < budget) { 484 napi_complete(napi); 485 if (unlikely(ib_req_notify_cq(priv->recv_cq, 486 IB_CQ_NEXT_COMP | 487 IB_CQ_REPORT_MISSED_EVENTS)) && 488 napi_reschedule(napi)) 489 goto poll_more; 490 } 491 492 return done; 493 } 494 495 int ipoib_tx_poll(struct napi_struct *napi, int budget) 496 { 497 struct ipoib_dev_priv *priv = container_of(napi, struct ipoib_dev_priv, 498 send_napi); 499 struct net_device *dev = priv->dev; 500 int n, i; 501 struct ib_wc *wc; 502 503 poll_more: 504 n = ib_poll_cq(priv->send_cq, MAX_SEND_CQE, priv->send_wc); 505 506 for (i = 0; i < n; i++) { 507 wc = priv->send_wc + i; 508 if (wc->wr_id & IPOIB_OP_CM) 509 ipoib_cm_handle_tx_wc(dev, wc); 510 else 511 ipoib_ib_handle_tx_wc(dev, wc); 512 } 513 514 if (n < budget) { 515 napi_complete(napi); 516 if (unlikely(ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP | 517 IB_CQ_REPORT_MISSED_EVENTS)) && 518 napi_reschedule(napi)) 519 goto poll_more; 520 } 521 return n < 0 ? 0 : n; 522 } 523 524 void ipoib_ib_rx_completion(struct ib_cq *cq, void *ctx_ptr) 525 { 526 struct ipoib_dev_priv *priv = ctx_ptr; 527 528 napi_schedule(&priv->recv_napi); 529 } 530 531 void ipoib_ib_tx_completion(struct ib_cq *cq, void *ctx_ptr) 532 { 533 struct ipoib_dev_priv *priv = ctx_ptr; 534 535 napi_schedule(&priv->send_napi); 536 } 537 538 static inline int post_send(struct ipoib_dev_priv *priv, 539 unsigned int wr_id, 540 struct ib_ah *address, u32 dqpn, 541 struct ipoib_tx_buf *tx_req, 542 void *head, int hlen) 543 { 544 struct sk_buff *skb = tx_req->skb; 545 546 ipoib_build_sge(priv, tx_req); 547 548 priv->tx_wr.wr.wr_id = wr_id; 549 priv->tx_wr.remote_qpn = dqpn; 550 priv->tx_wr.ah = address; 551 552 if (head) { 553 priv->tx_wr.mss = skb_shinfo(skb)->gso_size; 554 priv->tx_wr.header = head; 555 priv->tx_wr.hlen = hlen; 556 priv->tx_wr.wr.opcode = IB_WR_LSO; 557 } else 558 priv->tx_wr.wr.opcode = IB_WR_SEND; 559 560 return ib_post_send(priv->qp, &priv->tx_wr.wr, NULL); 561 } 562 563 int ipoib_send(struct net_device *dev, struct sk_buff *skb, 564 struct ib_ah *address, u32 dqpn) 565 { 566 struct ipoib_dev_priv *priv = ipoib_priv(dev); 567 struct ipoib_tx_buf *tx_req; 568 int hlen, rc; 569 void *phead; 570 unsigned int usable_sge = priv->max_send_sge - !!skb_headlen(skb); 571 572 if (skb_is_gso(skb)) { 573 hlen = skb_transport_offset(skb) + tcp_hdrlen(skb); 574 phead = skb->data; 575 if (unlikely(!skb_pull(skb, hlen))) { 576 ipoib_warn(priv, "linear data too small\n"); 577 ++dev->stats.tx_dropped; 578 ++dev->stats.tx_errors; 579 dev_kfree_skb_any(skb); 580 return -1; 581 } 582 } else { 583 if (unlikely(skb->len > priv->mcast_mtu + IPOIB_ENCAP_LEN)) { 584 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n", 585 skb->len, priv->mcast_mtu + IPOIB_ENCAP_LEN); 586 ++dev->stats.tx_dropped; 587 ++dev->stats.tx_errors; 588 ipoib_cm_skb_too_long(dev, skb, priv->mcast_mtu); 589 return -1; 590 } 591 phead = NULL; 592 hlen = 0; 593 } 594 if (skb_shinfo(skb)->nr_frags > usable_sge) { 595 if (skb_linearize(skb) < 0) { 596 ipoib_warn(priv, "skb could not be linearized\n"); 597 ++dev->stats.tx_dropped; 598 ++dev->stats.tx_errors; 599 dev_kfree_skb_any(skb); 600 return -1; 601 } 602 /* Does skb_linearize return ok without reducing nr_frags? */ 603 if (skb_shinfo(skb)->nr_frags > usable_sge) { 604 ipoib_warn(priv, "too many frags after skb linearize\n"); 605 ++dev->stats.tx_dropped; 606 ++dev->stats.tx_errors; 607 dev_kfree_skb_any(skb); 608 return -1; 609 } 610 } 611 612 ipoib_dbg_data(priv, 613 "sending packet, length=%d address=%p dqpn=0x%06x\n", 614 skb->len, address, dqpn); 615 616 /* 617 * We put the skb into the tx_ring _before_ we call post_send() 618 * because it's entirely possible that the completion handler will 619 * run before we execute anything after the post_send(). That 620 * means we have to make sure everything is properly recorded and 621 * our state is consistent before we call post_send(). 622 */ 623 tx_req = &priv->tx_ring[priv->tx_head & (ipoib_sendq_size - 1)]; 624 tx_req->skb = skb; 625 if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req))) { 626 ++dev->stats.tx_errors; 627 dev_kfree_skb_any(skb); 628 return -1; 629 } 630 631 if (skb->ip_summed == CHECKSUM_PARTIAL) 632 priv->tx_wr.wr.send_flags |= IB_SEND_IP_CSUM; 633 else 634 priv->tx_wr.wr.send_flags &= ~IB_SEND_IP_CSUM; 635 /* increase the tx_head after send success, but use it for queue state */ 636 if (priv->tx_head - priv->tx_tail == ipoib_sendq_size - 1) { 637 ipoib_dbg(priv, "TX ring full, stopping kernel net queue\n"); 638 netif_stop_queue(dev); 639 } 640 641 skb_orphan(skb); 642 skb_dst_drop(skb); 643 644 if (netif_queue_stopped(dev)) 645 if (ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP | 646 IB_CQ_REPORT_MISSED_EVENTS) < 0) 647 ipoib_warn(priv, "request notify on send CQ failed\n"); 648 649 rc = post_send(priv, priv->tx_head & (ipoib_sendq_size - 1), 650 address, dqpn, tx_req, phead, hlen); 651 if (unlikely(rc)) { 652 ipoib_warn(priv, "post_send failed, error %d\n", rc); 653 ++dev->stats.tx_errors; 654 ipoib_dma_unmap_tx(priv, tx_req); 655 dev_kfree_skb_any(skb); 656 if (netif_queue_stopped(dev)) 657 netif_wake_queue(dev); 658 rc = 0; 659 } else { 660 netif_trans_update(dev); 661 662 rc = priv->tx_head; 663 ++priv->tx_head; 664 } 665 return rc; 666 } 667 668 static void __ipoib_reap_ah(struct net_device *dev) 669 { 670 struct ipoib_dev_priv *priv = ipoib_priv(dev); 671 struct ipoib_ah *ah, *tah; 672 unsigned long flags; 673 674 netif_tx_lock_bh(dev); 675 spin_lock_irqsave(&priv->lock, flags); 676 677 list_for_each_entry_safe(ah, tah, &priv->dead_ahs, list) 678 if ((int) priv->tx_tail - (int) ah->last_send >= 0) { 679 list_del(&ah->list); 680 rdma_destroy_ah(ah->ah, 0); 681 kfree(ah); 682 } 683 684 spin_unlock_irqrestore(&priv->lock, flags); 685 netif_tx_unlock_bh(dev); 686 } 687 688 void ipoib_reap_ah(struct work_struct *work) 689 { 690 struct ipoib_dev_priv *priv = 691 container_of(work, struct ipoib_dev_priv, ah_reap_task.work); 692 struct net_device *dev = priv->dev; 693 694 __ipoib_reap_ah(dev); 695 696 if (!test_bit(IPOIB_STOP_REAPER, &priv->flags)) 697 queue_delayed_work(priv->wq, &priv->ah_reap_task, 698 round_jiffies_relative(HZ)); 699 } 700 701 static void ipoib_flush_ah(struct net_device *dev) 702 { 703 struct ipoib_dev_priv *priv = ipoib_priv(dev); 704 705 cancel_delayed_work(&priv->ah_reap_task); 706 flush_workqueue(priv->wq); 707 ipoib_reap_ah(&priv->ah_reap_task.work); 708 } 709 710 static void ipoib_stop_ah(struct net_device *dev) 711 { 712 struct ipoib_dev_priv *priv = ipoib_priv(dev); 713 714 set_bit(IPOIB_STOP_REAPER, &priv->flags); 715 ipoib_flush_ah(dev); 716 } 717 718 static int recvs_pending(struct net_device *dev) 719 { 720 struct ipoib_dev_priv *priv = ipoib_priv(dev); 721 int pending = 0; 722 int i; 723 724 for (i = 0; i < ipoib_recvq_size; ++i) 725 if (priv->rx_ring[i].skb) 726 ++pending; 727 728 return pending; 729 } 730 731 static void check_qp_movement_and_print(struct ipoib_dev_priv *priv, 732 struct ib_qp *qp, 733 enum ib_qp_state new_state) 734 { 735 struct ib_qp_attr qp_attr; 736 struct ib_qp_init_attr query_init_attr; 737 int ret; 738 739 ret = ib_query_qp(qp, &qp_attr, IB_QP_STATE, &query_init_attr); 740 if (ret) { 741 ipoib_warn(priv, "%s: Failed to query QP\n", __func__); 742 return; 743 } 744 /* print according to the new-state and the previous state.*/ 745 if (new_state == IB_QPS_ERR && qp_attr.qp_state == IB_QPS_RESET) 746 ipoib_dbg(priv, "Failed modify QP, IB_QPS_RESET to IB_QPS_ERR, acceptable\n"); 747 else 748 ipoib_warn(priv, "Failed to modify QP to state: %d from state: %d\n", 749 new_state, qp_attr.qp_state); 750 } 751 752 static void ipoib_napi_enable(struct net_device *dev) 753 { 754 struct ipoib_dev_priv *priv = ipoib_priv(dev); 755 756 napi_enable(&priv->recv_napi); 757 napi_enable(&priv->send_napi); 758 } 759 760 static void ipoib_napi_disable(struct net_device *dev) 761 { 762 struct ipoib_dev_priv *priv = ipoib_priv(dev); 763 764 napi_disable(&priv->recv_napi); 765 napi_disable(&priv->send_napi); 766 } 767 768 int ipoib_ib_dev_stop_default(struct net_device *dev) 769 { 770 struct ipoib_dev_priv *priv = ipoib_priv(dev); 771 struct ib_qp_attr qp_attr; 772 unsigned long begin; 773 struct ipoib_tx_buf *tx_req; 774 int i; 775 776 if (test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) 777 ipoib_napi_disable(dev); 778 779 ipoib_cm_dev_stop(dev); 780 781 /* 782 * Move our QP to the error state and then reinitialize in 783 * when all work requests have completed or have been flushed. 784 */ 785 qp_attr.qp_state = IB_QPS_ERR; 786 if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE)) 787 check_qp_movement_and_print(priv, priv->qp, IB_QPS_ERR); 788 789 /* Wait for all sends and receives to complete */ 790 begin = jiffies; 791 792 while (priv->tx_head != priv->tx_tail || recvs_pending(dev)) { 793 if (time_after(jiffies, begin + 5 * HZ)) { 794 ipoib_warn(priv, 795 "timing out; %d sends %d receives not completed\n", 796 priv->tx_head - priv->tx_tail, 797 recvs_pending(dev)); 798 799 /* 800 * assume the HW is wedged and just free up 801 * all our pending work requests. 802 */ 803 while ((int)priv->tx_tail - (int)priv->tx_head < 0) { 804 tx_req = &priv->tx_ring[priv->tx_tail & 805 (ipoib_sendq_size - 1)]; 806 ipoib_dma_unmap_tx(priv, tx_req); 807 dev_kfree_skb_any(tx_req->skb); 808 ++priv->tx_tail; 809 } 810 811 for (i = 0; i < ipoib_recvq_size; ++i) { 812 struct ipoib_rx_buf *rx_req; 813 814 rx_req = &priv->rx_ring[i]; 815 if (!rx_req->skb) 816 continue; 817 ipoib_ud_dma_unmap_rx(priv, 818 priv->rx_ring[i].mapping); 819 dev_kfree_skb_any(rx_req->skb); 820 rx_req->skb = NULL; 821 } 822 823 goto timeout; 824 } 825 826 ipoib_drain_cq(dev); 827 828 usleep_range(1000, 2000); 829 } 830 831 ipoib_dbg(priv, "All sends and receives done.\n"); 832 833 timeout: 834 qp_attr.qp_state = IB_QPS_RESET; 835 if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE)) 836 ipoib_warn(priv, "Failed to modify QP to RESET state\n"); 837 838 ib_req_notify_cq(priv->recv_cq, IB_CQ_NEXT_COMP); 839 840 return 0; 841 } 842 843 int ipoib_ib_dev_stop(struct net_device *dev) 844 { 845 struct ipoib_dev_priv *priv = ipoib_priv(dev); 846 847 priv->rn_ops->ndo_stop(dev); 848 849 clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags); 850 ipoib_flush_ah(dev); 851 852 return 0; 853 } 854 855 int ipoib_ib_dev_open_default(struct net_device *dev) 856 { 857 struct ipoib_dev_priv *priv = ipoib_priv(dev); 858 int ret; 859 860 ret = ipoib_init_qp(dev); 861 if (ret) { 862 ipoib_warn(priv, "ipoib_init_qp returned %d\n", ret); 863 return -1; 864 } 865 866 ret = ipoib_ib_post_receives(dev); 867 if (ret) { 868 ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret); 869 goto out; 870 } 871 872 ret = ipoib_cm_dev_open(dev); 873 if (ret) { 874 ipoib_warn(priv, "ipoib_cm_dev_open returned %d\n", ret); 875 goto out; 876 } 877 878 if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) 879 ipoib_napi_enable(dev); 880 881 return 0; 882 out: 883 return -1; 884 } 885 886 int ipoib_ib_dev_open(struct net_device *dev) 887 { 888 struct ipoib_dev_priv *priv = ipoib_priv(dev); 889 890 ipoib_pkey_dev_check_presence(dev); 891 892 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) { 893 ipoib_warn(priv, "P_Key 0x%04x is %s\n", priv->pkey, 894 (!(priv->pkey & 0x7fff) ? "Invalid" : "not found")); 895 return -1; 896 } 897 898 clear_bit(IPOIB_STOP_REAPER, &priv->flags); 899 queue_delayed_work(priv->wq, &priv->ah_reap_task, 900 round_jiffies_relative(HZ)); 901 902 if (priv->rn_ops->ndo_open(dev)) { 903 pr_warn("%s: Failed to open dev\n", dev->name); 904 goto dev_stop; 905 } 906 907 set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags); 908 909 return 0; 910 911 dev_stop: 912 set_bit(IPOIB_STOP_REAPER, &priv->flags); 913 cancel_delayed_work(&priv->ah_reap_task); 914 set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags); 915 ipoib_ib_dev_stop(dev); 916 return -1; 917 } 918 919 void ipoib_pkey_dev_check_presence(struct net_device *dev) 920 { 921 struct ipoib_dev_priv *priv = ipoib_priv(dev); 922 struct rdma_netdev *rn = netdev_priv(dev); 923 924 if (!(priv->pkey & 0x7fff) || 925 ib_find_pkey(priv->ca, priv->port, priv->pkey, 926 &priv->pkey_index)) { 927 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags); 928 } else { 929 if (rn->set_id) 930 rn->set_id(dev, priv->pkey_index); 931 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags); 932 } 933 } 934 935 void ipoib_ib_dev_up(struct net_device *dev) 936 { 937 struct ipoib_dev_priv *priv = ipoib_priv(dev); 938 939 ipoib_pkey_dev_check_presence(dev); 940 941 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) { 942 ipoib_dbg(priv, "PKEY is not assigned.\n"); 943 return; 944 } 945 946 set_bit(IPOIB_FLAG_OPER_UP, &priv->flags); 947 948 ipoib_mcast_start_thread(dev); 949 } 950 951 void ipoib_ib_dev_down(struct net_device *dev) 952 { 953 struct ipoib_dev_priv *priv = ipoib_priv(dev); 954 955 ipoib_dbg(priv, "downing ib_dev\n"); 956 957 clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags); 958 netif_carrier_off(dev); 959 960 ipoib_mcast_stop_thread(dev); 961 ipoib_mcast_dev_flush(dev); 962 963 ipoib_flush_paths(dev); 964 } 965 966 void ipoib_drain_cq(struct net_device *dev) 967 { 968 struct ipoib_dev_priv *priv = ipoib_priv(dev); 969 int i, n; 970 971 /* 972 * We call completion handling routines that expect to be 973 * called from the BH-disabled NAPI poll context, so disable 974 * BHs here too. 975 */ 976 local_bh_disable(); 977 978 do { 979 n = ib_poll_cq(priv->recv_cq, IPOIB_NUM_WC, priv->ibwc); 980 for (i = 0; i < n; ++i) { 981 /* 982 * Convert any successful completions to flush 983 * errors to avoid passing packets up the 984 * stack after bringing the device down. 985 */ 986 if (priv->ibwc[i].status == IB_WC_SUCCESS) 987 priv->ibwc[i].status = IB_WC_WR_FLUSH_ERR; 988 989 if (priv->ibwc[i].wr_id & IPOIB_OP_RECV) { 990 if (priv->ibwc[i].wr_id & IPOIB_OP_CM) 991 ipoib_cm_handle_rx_wc(dev, priv->ibwc + i); 992 else 993 ipoib_ib_handle_rx_wc(dev, priv->ibwc + i); 994 } else { 995 pr_warn("%s: Got unexpected wqe id\n", __func__); 996 } 997 } 998 } while (n == IPOIB_NUM_WC); 999 1000 while (poll_tx(priv)) 1001 ; /* nothing */ 1002 1003 local_bh_enable(); 1004 } 1005 1006 /* 1007 * Takes whatever value which is in pkey index 0 and updates priv->pkey 1008 * returns 0 if the pkey value was changed. 1009 */ 1010 static inline int update_parent_pkey(struct ipoib_dev_priv *priv) 1011 { 1012 int result; 1013 u16 prev_pkey; 1014 1015 prev_pkey = priv->pkey; 1016 result = ib_query_pkey(priv->ca, priv->port, 0, &priv->pkey); 1017 if (result) { 1018 ipoib_warn(priv, "ib_query_pkey port %d failed (ret = %d)\n", 1019 priv->port, result); 1020 return result; 1021 } 1022 1023 priv->pkey |= 0x8000; 1024 1025 if (prev_pkey != priv->pkey) { 1026 ipoib_dbg(priv, "pkey changed from 0x%x to 0x%x\n", 1027 prev_pkey, priv->pkey); 1028 /* 1029 * Update the pkey in the broadcast address, while making sure to set 1030 * the full membership bit, so that we join the right broadcast group. 1031 */ 1032 priv->dev->broadcast[8] = priv->pkey >> 8; 1033 priv->dev->broadcast[9] = priv->pkey & 0xff; 1034 return 0; 1035 } 1036 1037 return 1; 1038 } 1039 /* 1040 * returns 0 if pkey value was found in a different slot. 1041 */ 1042 static inline int update_child_pkey(struct ipoib_dev_priv *priv) 1043 { 1044 u16 old_index = priv->pkey_index; 1045 1046 priv->pkey_index = 0; 1047 ipoib_pkey_dev_check_presence(priv->dev); 1048 1049 if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags) && 1050 (old_index == priv->pkey_index)) 1051 return 1; 1052 return 0; 1053 } 1054 1055 /* 1056 * returns true if the device address of the ipoib interface has changed and the 1057 * new address is a valid one (i.e in the gid table), return false otherwise. 1058 */ 1059 static bool ipoib_dev_addr_changed_valid(struct ipoib_dev_priv *priv) 1060 { 1061 union ib_gid search_gid; 1062 union ib_gid gid0; 1063 union ib_gid *netdev_gid; 1064 int err; 1065 u16 index; 1066 u8 port; 1067 bool ret = false; 1068 1069 netdev_gid = (union ib_gid *)(priv->dev->dev_addr + 4); 1070 if (rdma_query_gid(priv->ca, priv->port, 0, &gid0)) 1071 return false; 1072 1073 netif_addr_lock_bh(priv->dev); 1074 1075 /* The subnet prefix may have changed, update it now so we won't have 1076 * to do it later 1077 */ 1078 priv->local_gid.global.subnet_prefix = gid0.global.subnet_prefix; 1079 netdev_gid->global.subnet_prefix = gid0.global.subnet_prefix; 1080 search_gid.global.subnet_prefix = gid0.global.subnet_prefix; 1081 1082 search_gid.global.interface_id = priv->local_gid.global.interface_id; 1083 1084 netif_addr_unlock_bh(priv->dev); 1085 1086 err = ib_find_gid(priv->ca, &search_gid, &port, &index); 1087 1088 netif_addr_lock_bh(priv->dev); 1089 1090 if (search_gid.global.interface_id != 1091 priv->local_gid.global.interface_id) 1092 /* There was a change while we were looking up the gid, bail 1093 * here and let the next work sort this out 1094 */ 1095 goto out; 1096 1097 /* The next section of code needs some background: 1098 * Per IB spec the port GUID can't change if the HCA is powered on. 1099 * port GUID is the basis for GID at index 0 which is the basis for 1100 * the default device address of a ipoib interface. 1101 * 1102 * so it seems the flow should be: 1103 * if user_changed_dev_addr && gid in gid tbl 1104 * set bit dev_addr_set 1105 * return true 1106 * else 1107 * return false 1108 * 1109 * The issue is that there are devices that don't follow the spec, 1110 * they change the port GUID when the HCA is powered, so in order 1111 * not to break userspace applications, We need to check if the 1112 * user wanted to control the device address and we assume that 1113 * if he sets the device address back to be based on GID index 0, 1114 * he no longer wishs to control it. 1115 * 1116 * If the user doesn't control the the device address, 1117 * IPOIB_FLAG_DEV_ADDR_SET is set and ib_find_gid failed it means 1118 * the port GUID has changed and GID at index 0 has changed 1119 * so we need to change priv->local_gid and priv->dev->dev_addr 1120 * to reflect the new GID. 1121 */ 1122 if (!test_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags)) { 1123 if (!err && port == priv->port) { 1124 set_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags); 1125 if (index == 0) 1126 clear_bit(IPOIB_FLAG_DEV_ADDR_CTRL, 1127 &priv->flags); 1128 else 1129 set_bit(IPOIB_FLAG_DEV_ADDR_CTRL, &priv->flags); 1130 ret = true; 1131 } else { 1132 ret = false; 1133 } 1134 } else { 1135 if (!err && port == priv->port) { 1136 ret = true; 1137 } else { 1138 if (!test_bit(IPOIB_FLAG_DEV_ADDR_CTRL, &priv->flags)) { 1139 memcpy(&priv->local_gid, &gid0, 1140 sizeof(priv->local_gid)); 1141 memcpy(priv->dev->dev_addr + 4, &gid0, 1142 sizeof(priv->local_gid)); 1143 ret = true; 1144 } 1145 } 1146 } 1147 1148 out: 1149 netif_addr_unlock_bh(priv->dev); 1150 1151 return ret; 1152 } 1153 1154 static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv, 1155 enum ipoib_flush_level level, 1156 int nesting) 1157 { 1158 struct ipoib_dev_priv *cpriv; 1159 struct net_device *dev = priv->dev; 1160 int result; 1161 1162 down_read_nested(&priv->vlan_rwsem, nesting); 1163 1164 /* 1165 * Flush any child interfaces too -- they might be up even if 1166 * the parent is down. 1167 */ 1168 list_for_each_entry(cpriv, &priv->child_intfs, list) 1169 __ipoib_ib_dev_flush(cpriv, level, nesting + 1); 1170 1171 up_read(&priv->vlan_rwsem); 1172 1173 if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags) && 1174 level != IPOIB_FLUSH_HEAVY) { 1175 /* Make sure the dev_addr is set even if not flushing */ 1176 if (level == IPOIB_FLUSH_LIGHT) 1177 ipoib_dev_addr_changed_valid(priv); 1178 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n"); 1179 return; 1180 } 1181 1182 if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) { 1183 /* interface is down. update pkey and leave. */ 1184 if (level == IPOIB_FLUSH_HEAVY) { 1185 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) 1186 update_parent_pkey(priv); 1187 else 1188 update_child_pkey(priv); 1189 } else if (level == IPOIB_FLUSH_LIGHT) 1190 ipoib_dev_addr_changed_valid(priv); 1191 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n"); 1192 return; 1193 } 1194 1195 if (level == IPOIB_FLUSH_HEAVY) { 1196 /* child devices chase their origin pkey value, while non-child 1197 * (parent) devices should always takes what present in pkey index 0 1198 */ 1199 if (test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) { 1200 result = update_child_pkey(priv); 1201 if (result) { 1202 /* restart QP only if P_Key index is changed */ 1203 ipoib_dbg(priv, "Not flushing - P_Key index not changed.\n"); 1204 return; 1205 } 1206 1207 } else { 1208 result = update_parent_pkey(priv); 1209 /* restart QP only if P_Key value changed */ 1210 if (result) { 1211 ipoib_dbg(priv, "Not flushing - P_Key value not changed.\n"); 1212 return; 1213 } 1214 } 1215 } 1216 1217 if (level == IPOIB_FLUSH_LIGHT) { 1218 int oper_up; 1219 ipoib_mark_paths_invalid(dev); 1220 /* Set IPoIB operation as down to prevent races between: 1221 * the flush flow which leaves MCG and on the fly joins 1222 * which can happen during that time. mcast restart task 1223 * should deal with join requests we missed. 1224 */ 1225 oper_up = test_and_clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags); 1226 ipoib_mcast_dev_flush(dev); 1227 if (oper_up) 1228 set_bit(IPOIB_FLAG_OPER_UP, &priv->flags); 1229 ipoib_flush_ah(dev); 1230 } 1231 1232 if (level >= IPOIB_FLUSH_NORMAL) 1233 ipoib_ib_dev_down(dev); 1234 1235 if (level == IPOIB_FLUSH_HEAVY) { 1236 if (test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) 1237 ipoib_ib_dev_stop(dev); 1238 1239 if (ipoib_ib_dev_open(dev)) 1240 return; 1241 1242 if (netif_queue_stopped(dev)) 1243 netif_start_queue(dev); 1244 } 1245 1246 /* 1247 * The device could have been brought down between the start and when 1248 * we get here, don't bring it back up if it's not configured up 1249 */ 1250 if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) { 1251 if (level >= IPOIB_FLUSH_NORMAL) 1252 ipoib_ib_dev_up(dev); 1253 if (ipoib_dev_addr_changed_valid(priv)) 1254 ipoib_mcast_restart_task(&priv->restart_task); 1255 } 1256 } 1257 1258 void ipoib_ib_dev_flush_light(struct work_struct *work) 1259 { 1260 struct ipoib_dev_priv *priv = 1261 container_of(work, struct ipoib_dev_priv, flush_light); 1262 1263 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_LIGHT, 0); 1264 } 1265 1266 void ipoib_ib_dev_flush_normal(struct work_struct *work) 1267 { 1268 struct ipoib_dev_priv *priv = 1269 container_of(work, struct ipoib_dev_priv, flush_normal); 1270 1271 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_NORMAL, 0); 1272 } 1273 1274 void ipoib_ib_dev_flush_heavy(struct work_struct *work) 1275 { 1276 struct ipoib_dev_priv *priv = 1277 container_of(work, struct ipoib_dev_priv, flush_heavy); 1278 1279 rtnl_lock(); 1280 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_HEAVY, 0); 1281 rtnl_unlock(); 1282 } 1283 1284 void ipoib_ib_dev_cleanup(struct net_device *dev) 1285 { 1286 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1287 1288 ipoib_dbg(priv, "cleaning up ib_dev\n"); 1289 /* 1290 * We must make sure there are no more (path) completions 1291 * that may wish to touch priv fields that are no longer valid 1292 */ 1293 ipoib_flush_paths(dev); 1294 1295 ipoib_mcast_stop_thread(dev); 1296 ipoib_mcast_dev_flush(dev); 1297 1298 /* 1299 * All of our ah references aren't free until after 1300 * ipoib_mcast_dev_flush(), ipoib_flush_paths, and 1301 * the neighbor garbage collection is stopped and reaped. 1302 * That should all be done now, so make a final ah flush. 1303 */ 1304 ipoib_stop_ah(dev); 1305 1306 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags); 1307 1308 priv->rn_ops->ndo_uninit(dev); 1309 1310 if (priv->pd) { 1311 ib_dealloc_pd(priv->pd); 1312 priv->pd = NULL; 1313 } 1314 } 1315 1316