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