drivers/infiniband/ulp/ipoib/ipoib_ib.c

   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
  44 #include "ipoib.h"
  45
  46 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA
  47 static int data_debug_level;
  48
  49 module_param(data_debug_level, int, 0644);
  50 MODULE_PARM_DESC(data_debug_level,
  51                  "Enable data path debug tracing if > 0");
  52 #endif
  53
  54 struct ipoib_ah *ipoib_create_ah(struct net_device *dev,
  55                                  struct ib_pd *pd, struct ib_ah_attr *attr)
  56 {
  57         struct ipoib_ah *ah;
  58         struct ib_ah *vah;
  59
  60         ah = kmalloc(sizeof *ah, GFP_KERNEL);
  61         if (!ah)
  62                 return ERR_PTR(-ENOMEM);
  63
  64         ah->dev       = dev;
  65         ah->last_send = 0;
  66         kref_init(&ah->ref);
  67
  68         vah = ib_create_ah(pd, attr);
  69         if (IS_ERR(vah)) {
  70                 kfree(ah);
  71                 ah = (struct ipoib_ah *)vah;
  72         } else {
  73                 ah->ah = vah;
  74                 ipoib_dbg(netdev_priv(dev), "Created ah %p\n", ah->ah);
  75         }
  76
  77         return ah;
  78 }
  79
  80 void 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         spin_lock_irqsave(&priv->lock, flags);
  88         list_add_tail(&ah->list, &priv->dead_ahs);
  89         spin_unlock_irqrestore(&priv->lock, flags);
  90 }
  91
  92 static void ipoib_ud_dma_unmap_rx(struct ipoib_dev_priv *priv,
  93                                   u64 mapping[IPOIB_UD_RX_SG])
  94 {
  95         ib_dma_unmap_single(priv->ca, mapping[0],
  96                             IPOIB_UD_BUF_SIZE(priv->max_ib_mtu),
  97                             DMA_FROM_DEVICE);
  98 }
  99
 100 static int ipoib_ib_post_receive(struct net_device *dev, int id)
 101 {
 102         struct ipoib_dev_priv *priv = netdev_priv(dev);
 103         struct ib_recv_wr *bad_wr;
 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, &bad_wr);
 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 = netdev_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_ENCAP_LEN);
 132         if (unlikely(!skb))
 133                 return NULL;
 134
 135         /*
 136          * IB will leave a 40 byte gap for a GRH and IPoIB adds a 4 byte
 137          * header.  So we need 4 more bytes to get to 48 and align the
 138          * IP header to a multiple of 16.
 139          */
 140         skb_reserve(skb, 4);
 141
 142         mapping = priv->rx_ring[id].mapping;
 143         mapping[0] = ib_dma_map_single(priv->ca, skb->data, buf_size,
 144                                        DMA_FROM_DEVICE);
 145         if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0])))
 146                 goto error;
 147
 148         priv->rx_ring[id].skb = skb;
 149         return skb;
 150 error:
 151         dev_kfree_skb_any(skb);
 152         return NULL;
 153 }
 154
 155 static int ipoib_ib_post_receives(struct net_device *dev)
 156 {
 157         struct ipoib_dev_priv *priv = netdev_priv(dev);
 158         int i;
 159
 160         for (i = 0; i < ipoib_recvq_size; ++i) {
 161                 if (!ipoib_alloc_rx_skb(dev, i)) {
 162                         ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
 163                         return -ENOMEM;
 164                 }
 165                 if (ipoib_ib_post_receive(dev, i)) {
 166                         ipoib_warn(priv, "ipoib_ib_post_receive failed for buf %d\n", i);
 167                         return -EIO;
 168                 }
 169         }
 170
 171         return 0;
 172 }
 173
 174 static void ipoib_ib_handle_rx_wc(struct net_device *dev, struct ib_wc *wc)
 175 {
 176         struct ipoib_dev_priv *priv = netdev_priv(dev);
 177         unsigned int wr_id = wc->wr_id & ~IPOIB_OP_RECV;
 178         struct sk_buff *skb;
 179         u64 mapping[IPOIB_UD_RX_SG];
 180         union ib_gid *dgid;
 181         union ib_gid *sgid;
 182
 183         ipoib_dbg_data(priv, "recv completion: id %d, status: %d\n",
 184                        wr_id, wc->status);
 185
 186         if (unlikely(wr_id >= ipoib_recvq_size)) {
 187                 ipoib_warn(priv, "recv completion event with wrid %d (> %d)\n",
 188                            wr_id, ipoib_recvq_size);
 189                 return;
 190         }
 191
 192         skb  = priv->rx_ring[wr_id].skb;
 193
 194         if (unlikely(wc->status != IB_WC_SUCCESS)) {
 195                 if (wc->status != IB_WC_WR_FLUSH_ERR)
 196                         ipoib_warn(priv, "failed recv event "
 197                                    "(status=%d, wrid=%d vend_err %x)\n",
 198                                    wc->status, wr_id, wc->vendor_err);
 199                 ipoib_ud_dma_unmap_rx(priv, priv->rx_ring[wr_id].mapping);
 200                 dev_kfree_skb_any(skb);
 201                 priv->rx_ring[wr_id].skb = NULL;
 202                 return;
 203         }
 204
 205         memcpy(mapping, priv->rx_ring[wr_id].mapping,
 206                IPOIB_UD_RX_SG * sizeof *mapping);
 207
 208         /*
 209          * If we can't allocate a new RX buffer, dump
 210          * this packet and reuse the old buffer.
 211          */
 212         if (unlikely(!ipoib_alloc_rx_skb(dev, wr_id))) {
 213                 ++dev->stats.rx_dropped;
 214                 goto repost;
 215         }
 216
 217         ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
 218                        wc->byte_len, wc->slid);
 219
 220         ipoib_ud_dma_unmap_rx(priv, mapping);
 221
 222         skb_put(skb, wc->byte_len);
 223
 224         /* First byte of dgid signals multicast when 0xff */
 225         dgid = &((struct ib_grh *)skb->data)->dgid;
 226
 227         if (!(wc->wc_flags & IB_WC_GRH) || dgid->raw[0] != 0xff)
 228                 skb->pkt_type = PACKET_HOST;
 229         else if (memcmp(dgid, dev->broadcast + 4, sizeof(union ib_gid)) == 0)
 230                 skb->pkt_type = PACKET_BROADCAST;
 231         else
 232                 skb->pkt_type = PACKET_MULTICAST;
 233
 234         sgid = &((struct ib_grh *)skb->data)->sgid;
 235
 236         /*
 237          * Drop packets that this interface sent, ie multicast packets
 238          * that the HCA has replicated.
 239          */
 240         if (wc->slid == priv->local_lid && wc->src_qp == priv->qp->qp_num) {
 241                 int need_repost = 1;
 242
 243                 if ((wc->wc_flags & IB_WC_GRH) &&
 244                     sgid->global.interface_id != priv->local_gid.global.interface_id)
 245                         need_repost = 0;
 246
 247                 if (need_repost) {
 248                         dev_kfree_skb_any(skb);
 249                         goto repost;
 250                 }
 251         }
 252
 253         skb_pull(skb, IB_GRH_BYTES);
 254
 255         skb->protocol = ((struct ipoib_header *) skb->data)->proto;
 256         skb_reset_mac_header(skb);
 257         skb_pull(skb, IPOIB_ENCAP_LEN);
 258
 259         ++dev->stats.rx_packets;
 260         dev->stats.rx_bytes += skb->len;
 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->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 = netdev_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         if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
 410             netif_queue_stopped(dev) &&
 411             test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
 412                 netif_wake_queue(dev);
 413
 414         if (wc->status != IB_WC_SUCCESS &&
 415             wc->status != IB_WC_WR_FLUSH_ERR) {
 416                 struct ipoib_qp_state_validate *qp_work;
 417                 ipoib_warn(priv, "failed send event "
 418                            "(status=%d, wrid=%d vend_err %x)\n",
 419                            wc->status, wr_id, wc->vendor_err);
 420                 qp_work = kzalloc(sizeof(*qp_work), GFP_ATOMIC);
 421                 if (!qp_work) {
 422                         ipoib_warn(priv, "%s Failed alloc ipoib_qp_state_validate for qp: 0x%x\n",
 423                                    __func__, priv->qp->qp_num);
 424                         return;
 425                 }
 426
 427                 INIT_WORK(&qp_work->work, ipoib_qp_state_validate_work);
 428                 qp_work->priv = priv;
 429                 queue_work(priv->wq, &qp_work->work);
 430         }
 431 }
 432
 433 static int poll_tx(struct ipoib_dev_priv *priv)
 434 {
 435         int n, i;
 436
 437         n = ib_poll_cq(priv->send_cq, MAX_SEND_CQE, priv->send_wc);
 438         for (i = 0; i < n; ++i)
 439                 ipoib_ib_handle_tx_wc(priv->dev, priv->send_wc + i);
 440
 441         return n == MAX_SEND_CQE;
 442 }
 443
 444 int ipoib_poll(struct napi_struct *napi, int budget)
 445 {
 446         struct ipoib_dev_priv *priv = container_of(napi, struct ipoib_dev_priv, napi);
 447         struct net_device *dev = priv->dev;
 448         int done;
 449         int t;
 450         int n, i;
 451
 452         done  = 0;
 453
 454 poll_more:
 455         while (done < budget) {
 456                 int max = (budget - done);
 457
 458                 t = min(IPOIB_NUM_WC, max);
 459                 n = ib_poll_cq(priv->recv_cq, t, priv->ibwc);
 460
 461                 for (i = 0; i < n; i++) {
 462                         struct ib_wc *wc = priv->ibwc + i;
 463
 464                         if (wc->wr_id & IPOIB_OP_RECV) {
 465                                 ++done;
 466                                 if (wc->wr_id & IPOIB_OP_CM)
 467                                         ipoib_cm_handle_rx_wc(dev, wc);
 468                                 else
 469                                         ipoib_ib_handle_rx_wc(dev, wc);
 470                         } else
 471                                 ipoib_cm_handle_tx_wc(priv->dev, wc);
 472                 }
 473
 474                 if (n != t)
 475                         break;
 476         }
 477
 478         if (done < budget) {
 479                 napi_complete(napi);
 480                 if (unlikely(ib_req_notify_cq(priv->recv_cq,
 481                                               IB_CQ_NEXT_COMP |
 482                                               IB_CQ_REPORT_MISSED_EVENTS)) &&
 483                     napi_reschedule(napi))
 484                         goto poll_more;
 485         }
 486
 487         return done;
 488 }
 489
 490 void ipoib_ib_completion(struct ib_cq *cq, void *dev_ptr)
 491 {
 492         struct net_device *dev = dev_ptr;
 493         struct ipoib_dev_priv *priv = netdev_priv(dev);
 494
 495         napi_schedule(&priv->napi);
 496 }
 497
 498 static void drain_tx_cq(struct net_device *dev)
 499 {
 500         struct ipoib_dev_priv *priv = netdev_priv(dev);
 501
 502         netif_tx_lock(dev);
 503         while (poll_tx(priv))
 504                 ; /* nothing */
 505
 506         if (netif_queue_stopped(dev))
 507                 mod_timer(&priv->poll_timer, jiffies + 1);
 508
 509         netif_tx_unlock(dev);
 510 }
 511
 512 void ipoib_send_comp_handler(struct ib_cq *cq, void *dev_ptr)
 513 {
 514         struct ipoib_dev_priv *priv = netdev_priv(dev_ptr);
 515
 516         mod_timer(&priv->poll_timer, jiffies);
 517 }
 518
 519 static inline int post_send(struct ipoib_dev_priv *priv,
 520                             unsigned int wr_id,
 521                             struct ib_ah *address, u32 qpn,
 522                             struct ipoib_tx_buf *tx_req,
 523                             void *head, int hlen)
 524 {
 525         struct ib_send_wr *bad_wr;
 526         struct sk_buff *skb = tx_req->skb;
 527
 528         ipoib_build_sge(priv, tx_req);
 529
 530         priv->tx_wr.wr.wr_id    = wr_id;
 531         priv->tx_wr.remote_qpn  = qpn;
 532         priv->tx_wr.ah          = address;
 533
 534         if (head) {
 535                 priv->tx_wr.mss         = skb_shinfo(skb)->gso_size;
 536                 priv->tx_wr.header      = head;
 537                 priv->tx_wr.hlen        = hlen;
 538                 priv->tx_wr.wr.opcode   = IB_WR_LSO;
 539         } else
 540                 priv->tx_wr.wr.opcode   = IB_WR_SEND;
 541
 542         return ib_post_send(priv->qp, &priv->tx_wr.wr, &bad_wr);
 543 }
 544
 545 void ipoib_send(struct net_device *dev, struct sk_buff *skb,
 546                 struct ipoib_ah *address, u32 qpn)
 547 {
 548         struct ipoib_dev_priv *priv = netdev_priv(dev);
 549         struct ipoib_tx_buf *tx_req;
 550         int hlen, rc;
 551         void *phead;
 552         unsigned usable_sge = priv->max_send_sge - !!skb_headlen(skb);
 553
 554         if (skb_is_gso(skb)) {
 555                 hlen = skb_transport_offset(skb) + tcp_hdrlen(skb);
 556                 phead = skb->data;
 557                 if (unlikely(!skb_pull(skb, hlen))) {
 558                         ipoib_warn(priv, "linear data too small\n");
 559                         ++dev->stats.tx_dropped;
 560                         ++dev->stats.tx_errors;
 561                         dev_kfree_skb_any(skb);
 562                         return;
 563                 }
 564         } else {
 565                 if (unlikely(skb->len > priv->mcast_mtu + IPOIB_ENCAP_LEN)) {
 566                         ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
 567                                    skb->len, priv->mcast_mtu + IPOIB_ENCAP_LEN);
 568                         ++dev->stats.tx_dropped;
 569                         ++dev->stats.tx_errors;
 570                         ipoib_cm_skb_too_long(dev, skb, priv->mcast_mtu);
 571                         return;
 572                 }
 573                 phead = NULL;
 574                 hlen  = 0;
 575         }
 576         if (skb_shinfo(skb)->nr_frags > usable_sge) {
 577                 if (skb_linearize(skb) < 0) {
 578                         ipoib_warn(priv, "skb could not be linearized\n");
 579                         ++dev->stats.tx_dropped;
 580                         ++dev->stats.tx_errors;
 581                         dev_kfree_skb_any(skb);
 582                         return;
 583                 }
 584                 /* Does skb_linearize return ok without reducing nr_frags? */
 585                 if (skb_shinfo(skb)->nr_frags > usable_sge) {
 586                         ipoib_warn(priv, "too many frags after skb linearize\n");
 587                         ++dev->stats.tx_dropped;
 588                         ++dev->stats.tx_errors;
 589                         dev_kfree_skb_any(skb);
 590                         return;
 591                 }
 592         }
 593
 594         ipoib_dbg_data(priv, "sending packet, length=%d address=%p qpn=0x%06x\n",
 595                        skb->len, address, qpn);
 596
 597         /*
 598          * We put the skb into the tx_ring _before_ we call post_send()
 599          * because it's entirely possible that the completion handler will
 600          * run before we execute anything after the post_send().  That
 601          * means we have to make sure everything is properly recorded and
 602          * our state is consistent before we call post_send().
 603          */
 604         tx_req = &priv->tx_ring[priv->tx_head & (ipoib_sendq_size - 1)];
 605         tx_req->skb = skb;
 606         if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req))) {
 607                 ++dev->stats.tx_errors;
 608                 dev_kfree_skb_any(skb);
 609                 return;
 610         }
 611
 612         if (skb->ip_summed == CHECKSUM_PARTIAL)
 613                 priv->tx_wr.wr.send_flags |= IB_SEND_IP_CSUM;
 614         else
 615                 priv->tx_wr.wr.send_flags &= ~IB_SEND_IP_CSUM;
 616
 617         if (++priv->tx_outstanding == ipoib_sendq_size) {
 618                 ipoib_dbg(priv, "TX ring full, stopping kernel net queue\n");
 619                 if (ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP))
 620                         ipoib_warn(priv, "request notify on send CQ failed\n");
 621                 netif_stop_queue(dev);
 622         }
 623
 624         skb_orphan(skb);
 625         skb_dst_drop(skb);
 626
 627         rc = post_send(priv, priv->tx_head & (ipoib_sendq_size - 1),
 628                        address->ah, qpn, tx_req, phead, hlen);
 629         if (unlikely(rc)) {
 630                 ipoib_warn(priv, "post_send failed, error %d\n", rc);
 631                 ++dev->stats.tx_errors;
 632                 --priv->tx_outstanding;
 633                 ipoib_dma_unmap_tx(priv, tx_req);
 634                 dev_kfree_skb_any(skb);
 635                 if (netif_queue_stopped(dev))
 636                         netif_wake_queue(dev);
 637         } else {
 638                 netif_trans_update(dev);
 639
 640                 address->last_send = priv->tx_head;
 641                 ++priv->tx_head;
 642         }
 643
 644         if (unlikely(priv->tx_outstanding > MAX_SEND_CQE))
 645                 while (poll_tx(priv))
 646                         ; /* nothing */
 647 }
 648
 649 static void __ipoib_reap_ah(struct net_device *dev)
 650 {
 651         struct ipoib_dev_priv *priv = netdev_priv(dev);
 652         struct ipoib_ah *ah, *tah;
 653         LIST_HEAD(remove_list);
 654         unsigned long flags;
 655
 656         netif_tx_lock_bh(dev);
 657         spin_lock_irqsave(&priv->lock, flags);
 658
 659         list_for_each_entry_safe(ah, tah, &priv->dead_ahs, list)
 660                 if ((int) priv->tx_tail - (int) ah->last_send >= 0) {
 661                         list_del(&ah->list);
 662                         ib_destroy_ah(ah->ah);
 663                         kfree(ah);
 664                 }
 665
 666         spin_unlock_irqrestore(&priv->lock, flags);
 667         netif_tx_unlock_bh(dev);
 668 }
 669
 670 void ipoib_reap_ah(struct work_struct *work)
 671 {
 672         struct ipoib_dev_priv *priv =
 673                 container_of(work, struct ipoib_dev_priv, ah_reap_task.work);
 674         struct net_device *dev = priv->dev;
 675
 676         __ipoib_reap_ah(dev);
 677
 678         if (!test_bit(IPOIB_STOP_REAPER, &priv->flags))
 679                 queue_delayed_work(priv->wq, &priv->ah_reap_task,
 680                                    round_jiffies_relative(HZ));
 681 }
 682
 683 static void ipoib_flush_ah(struct net_device *dev)
 684 {
 685         struct ipoib_dev_priv *priv = netdev_priv(dev);
 686
 687         cancel_delayed_work(&priv->ah_reap_task);
 688         flush_workqueue(priv->wq);
 689         ipoib_reap_ah(&priv->ah_reap_task.work);
 690 }
 691
 692 static void ipoib_stop_ah(struct net_device *dev)
 693 {
 694         struct ipoib_dev_priv *priv = netdev_priv(dev);
 695
 696         set_bit(IPOIB_STOP_REAPER, &priv->flags);
 697         ipoib_flush_ah(dev);
 698 }
 699
 700 static void ipoib_ib_tx_timer_func(unsigned long ctx)
 701 {
 702         drain_tx_cq((struct net_device *)ctx);
 703 }
 704
 705 int ipoib_ib_dev_open(struct net_device *dev)
 706 {
 707         struct ipoib_dev_priv *priv = netdev_priv(dev);
 708         int ret;
 709
 710         ipoib_pkey_dev_check_presence(dev);
 711
 712         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
 713                 ipoib_warn(priv, "P_Key 0x%04x is %s\n", priv->pkey,
 714                            (!(priv->pkey & 0x7fff) ? "Invalid" : "not found"));
 715                 return -1;
 716         }
 717
 718         ret = ipoib_init_qp(dev);
 719         if (ret) {
 720                 ipoib_warn(priv, "ipoib_init_qp returned %d\n", ret);
 721                 return -1;
 722         }
 723
 724         ret = ipoib_ib_post_receives(dev);
 725         if (ret) {
 726                 ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret);
 727                 goto dev_stop;
 728         }
 729
 730         ret = ipoib_cm_dev_open(dev);
 731         if (ret) {
 732                 ipoib_warn(priv, "ipoib_cm_dev_open returned %d\n", ret);
 733                 goto dev_stop;
 734         }
 735
 736         clear_bit(IPOIB_STOP_REAPER, &priv->flags);
 737         queue_delayed_work(priv->wq, &priv->ah_reap_task,
 738                            round_jiffies_relative(HZ));
 739
 740         if (!test_and_set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
 741                 napi_enable(&priv->napi);
 742
 743         return 0;
 744 dev_stop:
 745         if (!test_and_set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
 746                 napi_enable(&priv->napi);
 747         ipoib_ib_dev_stop(dev);
 748         return -1;
 749 }
 750
 751 void ipoib_pkey_dev_check_presence(struct net_device *dev)
 752 {
 753         struct ipoib_dev_priv *priv = netdev_priv(dev);
 754
 755         if (!(priv->pkey & 0x7fff) ||
 756             ib_find_pkey(priv->ca, priv->port, priv->pkey,
 757                          &priv->pkey_index))
 758                 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 759         else
 760                 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 761 }
 762
 763 int ipoib_ib_dev_up(struct net_device *dev)
 764 {
 765         struct ipoib_dev_priv *priv = netdev_priv(dev);
 766
 767         ipoib_pkey_dev_check_presence(dev);
 768
 769         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
 770                 ipoib_dbg(priv, "PKEY is not assigned.\n");
 771                 return 0;
 772         }
 773
 774         set_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
 775
 776         return ipoib_mcast_start_thread(dev);
 777 }
 778
 779 int ipoib_ib_dev_down(struct net_device *dev)
 780 {
 781         struct ipoib_dev_priv *priv = netdev_priv(dev);
 782
 783         ipoib_dbg(priv, "downing ib_dev\n");
 784
 785         clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
 786         netif_carrier_off(dev);
 787
 788         ipoib_mcast_stop_thread(dev);
 789         ipoib_mcast_dev_flush(dev);
 790
 791         ipoib_flush_paths(dev);
 792
 793         return 0;
 794 }
 795
 796 static int recvs_pending(struct net_device *dev)
 797 {
 798         struct ipoib_dev_priv *priv = netdev_priv(dev);
 799         int pending = 0;
 800         int i;
 801
 802         for (i = 0; i < ipoib_recvq_size; ++i)
 803                 if (priv->rx_ring[i].skb)
 804                         ++pending;
 805
 806         return pending;
 807 }
 808
 809 void ipoib_drain_cq(struct net_device *dev)
 810 {
 811         struct ipoib_dev_priv *priv = netdev_priv(dev);
 812         int i, n;
 813
 814         /*
 815          * We call completion handling routines that expect to be
 816          * called from the BH-disabled NAPI poll context, so disable
 817          * BHs here too.
 818          */
 819         local_bh_disable();
 820
 821         do {
 822                 n = ib_poll_cq(priv->recv_cq, IPOIB_NUM_WC, priv->ibwc);
 823                 for (i = 0; i < n; ++i) {
 824                         /*
 825                          * Convert any successful completions to flush
 826                          * errors to avoid passing packets up the
 827                          * stack after bringing the device down.
 828                          */
 829                         if (priv->ibwc[i].status == IB_WC_SUCCESS)
 830                                 priv->ibwc[i].status = IB_WC_WR_FLUSH_ERR;
 831
 832                         if (priv->ibwc[i].wr_id & IPOIB_OP_RECV) {
 833                                 if (priv->ibwc[i].wr_id & IPOIB_OP_CM)
 834                                         ipoib_cm_handle_rx_wc(dev, priv->ibwc + i);
 835                                 else
 836                                         ipoib_ib_handle_rx_wc(dev, priv->ibwc + i);
 837                         } else
 838                                 ipoib_cm_handle_tx_wc(dev, priv->ibwc + i);
 839                 }
 840         } while (n == IPOIB_NUM_WC);
 841
 842         while (poll_tx(priv))
 843                 ; /* nothing */
 844
 845         local_bh_enable();
 846 }
 847
 848 int ipoib_ib_dev_stop(struct net_device *dev)
 849 {
 850         struct ipoib_dev_priv *priv = netdev_priv(dev);
 851         struct ib_qp_attr qp_attr;
 852         unsigned long begin;
 853         struct ipoib_tx_buf *tx_req;
 854         int i;
 855
 856         if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
 857                 napi_disable(&priv->napi);
 858
 859         ipoib_cm_dev_stop(dev);
 860
 861         /*
 862          * Move our QP to the error state and then reinitialize in
 863          * when all work requests have completed or have been flushed.
 864          */
 865         qp_attr.qp_state = IB_QPS_ERR;
 866         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
 867                 ipoib_warn(priv, "Failed to modify QP to ERROR state\n");
 868
 869         /* Wait for all sends and receives to complete */
 870         begin = jiffies;
 871
 872         while (priv->tx_head != priv->tx_tail || recvs_pending(dev)) {
 873                 if (time_after(jiffies, begin + 5 * HZ)) {
 874                         ipoib_warn(priv, "timing out; %d sends %d receives not completed\n",
 875                                    priv->tx_head - priv->tx_tail, recvs_pending(dev));
 876
 877                         /*
 878                          * assume the HW is wedged and just free up
 879                          * all our pending work requests.
 880                          */
 881                         while ((int) priv->tx_tail - (int) priv->tx_head < 0) {
 882                                 tx_req = &priv->tx_ring[priv->tx_tail &
 883                                                         (ipoib_sendq_size - 1)];
 884                                 ipoib_dma_unmap_tx(priv, tx_req);
 885                                 dev_kfree_skb_any(tx_req->skb);
 886                                 ++priv->tx_tail;
 887                                 --priv->tx_outstanding;
 888                         }
 889
 890                         for (i = 0; i < ipoib_recvq_size; ++i) {
 891                                 struct ipoib_rx_buf *rx_req;
 892
 893                                 rx_req = &priv->rx_ring[i];
 894                                 if (!rx_req->skb)
 895                                         continue;
 896                                 ipoib_ud_dma_unmap_rx(priv,
 897                                                       priv->rx_ring[i].mapping);
 898                                 dev_kfree_skb_any(rx_req->skb);
 899                                 rx_req->skb = NULL;
 900                         }
 901
 902                         goto timeout;
 903                 }
 904
 905                 ipoib_drain_cq(dev);
 906
 907                 msleep(1);
 908         }
 909
 910         ipoib_dbg(priv, "All sends and receives done.\n");
 911
 912 timeout:
 913         del_timer_sync(&priv->poll_timer);
 914         qp_attr.qp_state = IB_QPS_RESET;
 915         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
 916                 ipoib_warn(priv, "Failed to modify QP to RESET state\n");
 917
 918         ipoib_flush_ah(dev);
 919
 920         ib_req_notify_cq(priv->recv_cq, IB_CQ_NEXT_COMP);
 921
 922         return 0;
 923 }
 924
 925 int ipoib_ib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
 926 {
 927         struct ipoib_dev_priv *priv = netdev_priv(dev);
 928
 929         priv->ca = ca;
 930         priv->port = port;
 931         priv->qp = NULL;
 932
 933         if (ipoib_transport_dev_init(dev, ca)) {
 934                 printk(KERN_WARNING "%s: ipoib_transport_dev_init failed\n", ca->name);
 935                 return -ENODEV;
 936         }
 937
 938         setup_timer(&priv->poll_timer, ipoib_ib_tx_timer_func,
 939                     (unsigned long) dev);
 940
 941         if (dev->flags & IFF_UP) {
 942                 if (ipoib_ib_dev_open(dev)) {
 943                         ipoib_transport_dev_cleanup(dev);
 944                         return -ENODEV;
 945                 }
 946         }
 947
 948         return 0;
 949 }
 950
 951 /*
 952  * Takes whatever value which is in pkey index 0 and updates priv->pkey
 953  * returns 0 if the pkey value was changed.
 954  */
 955 static inline int update_parent_pkey(struct ipoib_dev_priv *priv)
 956 {
 957         int result;
 958         u16 prev_pkey;
 959
 960         prev_pkey = priv->pkey;
 961         result = ib_query_pkey(priv->ca, priv->port, 0, &priv->pkey);
 962         if (result) {
 963                 ipoib_warn(priv, "ib_query_pkey port %d failed (ret = %d)\n",
 964                            priv->port, result);
 965                 return result;
 966         }
 967
 968         priv->pkey |= 0x8000;
 969
 970         if (prev_pkey != priv->pkey) {
 971                 ipoib_dbg(priv, "pkey changed from 0x%x to 0x%x\n",
 972                           prev_pkey, priv->pkey);
 973                 /*
 974                  * Update the pkey in the broadcast address, while making sure to set
 975                  * the full membership bit, so that we join the right broadcast group.
 976                  */
 977                 priv->dev->broadcast[8] = priv->pkey >> 8;
 978                 priv->dev->broadcast[9] = priv->pkey & 0xff;
 979                 return 0;
 980         }
 981
 982         return 1;
 983 }
 984 /*
 985  * returns 0 if pkey value was found in a different slot.
 986  */
 987 static inline int update_child_pkey(struct ipoib_dev_priv *priv)
 988 {
 989         u16 old_index = priv->pkey_index;
 990
 991         priv->pkey_index = 0;
 992         ipoib_pkey_dev_check_presence(priv->dev);
 993
 994         if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags) &&
 995             (old_index == priv->pkey_index))
 996                 return 1;
 997         return 0;
 998 }
 999
1000 /*
1001  * returns true if the device address of the ipoib interface has changed and the
1002  * new address is a valid one (i.e in the gid table), return false otherwise.
1003  */
1004 static bool ipoib_dev_addr_changed_valid(struct ipoib_dev_priv *priv)
1005 {
1006         union ib_gid search_gid;
1007         union ib_gid gid0;
1008         union ib_gid *netdev_gid;
1009         int err;
1010         u16 index;
1011         u8 port;
1012         bool ret = false;
1013
1014         netdev_gid = (union ib_gid *)(priv->dev->dev_addr + 4);
1015         if (ib_query_gid(priv->ca, priv->port, 0, &gid0, NULL))
1016                 return false;
1017
1018         netif_addr_lock(priv->dev);
1019
1020         /* The subnet prefix may have changed, update it now so we won't have
1021          * to do it later
1022          */
1023         priv->local_gid.global.subnet_prefix = gid0.global.subnet_prefix;
1024         netdev_gid->global.subnet_prefix = gid0.global.subnet_prefix;
1025         search_gid.global.subnet_prefix = gid0.global.subnet_prefix;
1026
1027         search_gid.global.interface_id = priv->local_gid.global.interface_id;
1028
1029         netif_addr_unlock(priv->dev);
1030
1031         err = ib_find_gid(priv->ca, &search_gid, IB_GID_TYPE_IB,
1032                           priv->dev, &port, &index);
1033
1034         netif_addr_lock(priv->dev);
1035
1036         if (search_gid.global.interface_id !=
1037             priv->local_gid.global.interface_id)
1038                 /* There was a change while we were looking up the gid, bail
1039                  * here and let the next work sort this out
1040                  */
1041                 goto out;
1042
1043         /* The next section of code needs some background:
1044          * Per IB spec the port GUID can't change if the HCA is powered on.
1045          * port GUID is the basis for GID at index 0 which is the basis for
1046          * the default device address of a ipoib interface.
1047          *
1048          * so it seems the flow should be:
1049          * if user_changed_dev_addr && gid in gid tbl
1050          *      set bit dev_addr_set
1051          *      return true
1052          * else
1053          *      return false
1054          *
1055          * The issue is that there are devices that don't follow the spec,
1056          * they change the port GUID when the HCA is powered, so in order
1057          * not to break userspace applications, We need to check if the
1058          * user wanted to control the device address and we assume that
1059          * if he sets the device address back to be based on GID index 0,
1060          * he no longer wishs to control it.
1061          *
1062          * If the user doesn't control the the device address,
1063          * IPOIB_FLAG_DEV_ADDR_SET is set and ib_find_gid failed it means
1064          * the port GUID has changed and GID at index 0 has changed
1065          * so we need to change priv->local_gid and priv->dev->dev_addr
1066          * to reflect the new GID.
1067          */
1068         if (!test_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags)) {
1069                 if (!err && port == priv->port) {
1070                         set_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags);
1071                         if (index == 0)
1072                                 clear_bit(IPOIB_FLAG_DEV_ADDR_CTRL,
1073                                           &priv->flags);
1074                         else
1075                                 set_bit(IPOIB_FLAG_DEV_ADDR_CTRL, &priv->flags);
1076                         ret = true;
1077                 } else {
1078                         ret = false;
1079                 }
1080         } else {
1081                 if (!err && port == priv->port) {
1082                         ret = true;
1083                 } else {
1084                         if (!test_bit(IPOIB_FLAG_DEV_ADDR_CTRL, &priv->flags)) {
1085                                 memcpy(&priv->local_gid, &gid0,
1086                                        sizeof(priv->local_gid));
1087                                 memcpy(priv->dev->dev_addr + 4, &gid0,
1088                                        sizeof(priv->local_gid));
1089                                 ret = true;
1090                         }
1091                 }
1092         }
1093
1094 out:
1095         netif_addr_unlock(priv->dev);
1096
1097         return ret;
1098 }
1099
1100 static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv,
1101                                 enum ipoib_flush_level level,
1102                                 int nesting)
1103 {
1104         struct ipoib_dev_priv *cpriv;
1105         struct net_device *dev = priv->dev;
1106         int result;
1107
1108         down_read_nested(&priv->vlan_rwsem, nesting);
1109
1110         /*
1111          * Flush any child interfaces too -- they might be up even if
1112          * the parent is down.
1113          */
1114         list_for_each_entry(cpriv, &priv->child_intfs, list)
1115                 __ipoib_ib_dev_flush(cpriv, level, nesting + 1);
1116
1117         up_read(&priv->vlan_rwsem);
1118
1119         if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags) &&
1120             level != IPOIB_FLUSH_HEAVY) {
1121                 /* Make sure the dev_addr is set even if not flushing */
1122                 if (level == IPOIB_FLUSH_LIGHT)
1123                         ipoib_dev_addr_changed_valid(priv);
1124                 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n");
1125                 return;
1126         }
1127
1128         if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
1129                 /* interface is down. update pkey and leave. */
1130                 if (level == IPOIB_FLUSH_HEAVY) {
1131                         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags))
1132                                 update_parent_pkey(priv);
1133                         else
1134                                 update_child_pkey(priv);
1135                 } else if (level == IPOIB_FLUSH_LIGHT)
1136                         ipoib_dev_addr_changed_valid(priv);
1137                 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n");
1138                 return;
1139         }
1140
1141         if (level == IPOIB_FLUSH_HEAVY) {
1142                 /* child devices chase their origin pkey value, while non-child
1143                  * (parent) devices should always takes what present in pkey index 0
1144                  */
1145                 if (test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
1146                         result = update_child_pkey(priv);
1147                         if (result) {
1148                                 /* restart QP only if P_Key index is changed */
1149                                 ipoib_dbg(priv, "Not flushing - P_Key index not changed.\n");
1150                                 return;
1151                         }
1152
1153                 } else {
1154                         result = update_parent_pkey(priv);
1155                         /* restart QP only if P_Key value changed */
1156                         if (result) {
1157                                 ipoib_dbg(priv, "Not flushing - P_Key value not changed.\n");
1158                                 return;
1159                         }
1160                 }
1161         }
1162
1163         if (level == IPOIB_FLUSH_LIGHT) {
1164                 ipoib_mark_paths_invalid(dev);
1165                 ipoib_mcast_dev_flush(dev);
1166                 ipoib_flush_ah(dev);
1167         }
1168
1169         if (level >= IPOIB_FLUSH_NORMAL)
1170                 ipoib_ib_dev_down(dev);
1171
1172         if (level == IPOIB_FLUSH_HEAVY) {
1173                 if (test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
1174                         ipoib_ib_dev_stop(dev);
1175                 if (ipoib_ib_dev_open(dev) != 0)
1176                         return;
1177                 if (netif_queue_stopped(dev))
1178                         netif_start_queue(dev);
1179         }
1180
1181         /*
1182          * The device could have been brought down between the start and when
1183          * we get here, don't bring it back up if it's not configured up
1184          */
1185         if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
1186                 if (level >= IPOIB_FLUSH_NORMAL)
1187                         ipoib_ib_dev_up(dev);
1188                 if (ipoib_dev_addr_changed_valid(priv))
1189                         ipoib_mcast_restart_task(&priv->restart_task);
1190         }
1191 }
1192
1193 void ipoib_ib_dev_flush_light(struct work_struct *work)
1194 {
1195         struct ipoib_dev_priv *priv =
1196                 container_of(work, struct ipoib_dev_priv, flush_light);
1197
1198         __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_LIGHT, 0);
1199 }
1200
1201 void ipoib_ib_dev_flush_normal(struct work_struct *work)
1202 {
1203         struct ipoib_dev_priv *priv =
1204                 container_of(work, struct ipoib_dev_priv, flush_normal);
1205
1206         __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_NORMAL, 0);
1207 }
1208
1209 void ipoib_ib_dev_flush_heavy(struct work_struct *work)
1210 {
1211         struct ipoib_dev_priv *priv =
1212                 container_of(work, struct ipoib_dev_priv, flush_heavy);
1213
1214         __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_HEAVY, 0);
1215 }
1216
1217 void ipoib_ib_dev_cleanup(struct net_device *dev)
1218 {
1219         struct ipoib_dev_priv *priv = netdev_priv(dev);
1220
1221         ipoib_dbg(priv, "cleaning up ib_dev\n");
1222         /*
1223          * We must make sure there are no more (path) completions
1224          * that may wish to touch priv fields that are no longer valid
1225          */
1226         ipoib_flush_paths(dev);
1227
1228         ipoib_mcast_stop_thread(dev);
1229         ipoib_mcast_dev_flush(dev);
1230
1231         /*
1232          * All of our ah references aren't free until after
1233          * ipoib_mcast_dev_flush(), ipoib_flush_paths, and
1234          * the neighbor garbage collection is stopped and reaped.
1235          * That should all be done now, so make a final ah flush.
1236          */
1237         ipoib_stop_ah(dev);
1238
1239         ipoib_transport_dev_cleanup(dev);
1240 }
1241
1242