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