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