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 /* The function will force napi_schedule */
 535 void ipoib_napi_schedule_work(struct work_struct *work)
 536 {
 537         struct ipoib_dev_priv *priv =
 538                 container_of(work, struct ipoib_dev_priv, reschedule_napi_work);
 539         bool ret;
 540
 541         do {
 542                 ret = napi_schedule(&priv->send_napi);
 543                 if (!ret)
 544                         msleep(3);
 545         } while (!ret && netif_queue_stopped(priv->dev) &&
 546                  test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags));
 547 }
 548
 549 void ipoib_ib_tx_completion(struct ib_cq *cq, void *ctx_ptr)
 550 {
 551         struct ipoib_dev_priv *priv = ctx_ptr;
 552         bool ret;
 553
 554         ret = napi_schedule(&priv->send_napi);
 555         /*
 556          * if the queue is closed the driver must be able to schedule napi,
 557          * otherwise we can end with closed queue forever, because no new
 558          * packets to send and napi callback might not get new event after
 559          * its re-arm of the napi.
 560          */
 561         if (!ret && netif_queue_stopped(priv->dev))
 562                 schedule_work(&priv->reschedule_napi_work);
 563 }
 564
 565 static inline int post_send(struct ipoib_dev_priv *priv,
 566                             unsigned int wr_id,
 567                             struct ib_ah *address, u32 dqpn,
 568                             struct ipoib_tx_buf *tx_req,
 569                             void *head, int hlen)
 570 {
 571         struct sk_buff *skb = tx_req->skb;
 572
 573         ipoib_build_sge(priv, tx_req);
 574
 575         priv->tx_wr.wr.wr_id    = wr_id;
 576         priv->tx_wr.remote_qpn  = dqpn;
 577         priv->tx_wr.ah          = address;
 578
 579         if (head) {
 580                 priv->tx_wr.mss         = skb_shinfo(skb)->gso_size;
 581                 priv->tx_wr.header      = head;
 582                 priv->tx_wr.hlen        = hlen;
 583                 priv->tx_wr.wr.opcode   = IB_WR_LSO;
 584         } else
 585                 priv->tx_wr.wr.opcode   = IB_WR_SEND;
 586
 587         return ib_post_send(priv->qp, &priv->tx_wr.wr, NULL);
 588 }
 589
 590 int ipoib_send(struct net_device *dev, struct sk_buff *skb,
 591                struct ib_ah *address, u32 dqpn)
 592 {
 593         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 594         struct ipoib_tx_buf *tx_req;
 595         int hlen, rc;
 596         void *phead;
 597         unsigned int usable_sge = priv->max_send_sge - !!skb_headlen(skb);
 598
 599         if (skb_is_gso(skb)) {
 600                 hlen = skb_tcp_all_headers(skb);
 601                 phead = skb->data;
 602                 if (unlikely(!skb_pull(skb, hlen))) {
 603                         ipoib_warn(priv, "linear data too small\n");
 604                         ++dev->stats.tx_dropped;
 605                         ++dev->stats.tx_errors;
 606                         dev_kfree_skb_any(skb);
 607                         return -1;
 608                 }
 609         } else {
 610                 if (unlikely(skb->len > priv->mcast_mtu + IPOIB_ENCAP_LEN)) {
 611                         ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
 612                                    skb->len, priv->mcast_mtu + IPOIB_ENCAP_LEN);
 613                         ++dev->stats.tx_dropped;
 614                         ++dev->stats.tx_errors;
 615                         ipoib_cm_skb_too_long(dev, skb, priv->mcast_mtu);
 616                         return -1;
 617                 }
 618                 phead = NULL;
 619                 hlen  = 0;
 620         }
 621         if (skb_shinfo(skb)->nr_frags > usable_sge) {
 622                 if (skb_linearize(skb) < 0) {
 623                         ipoib_warn(priv, "skb could not be linearized\n");
 624                         ++dev->stats.tx_dropped;
 625                         ++dev->stats.tx_errors;
 626                         dev_kfree_skb_any(skb);
 627                         return -1;
 628                 }
 629                 /* Does skb_linearize return ok without reducing nr_frags? */
 630                 if (skb_shinfo(skb)->nr_frags > usable_sge) {
 631                         ipoib_warn(priv, "too many frags after skb linearize\n");
 632                         ++dev->stats.tx_dropped;
 633                         ++dev->stats.tx_errors;
 634                         dev_kfree_skb_any(skb);
 635                         return -1;
 636                 }
 637         }
 638
 639         ipoib_dbg_data(priv,
 640                        "sending packet, length=%d address=%p dqpn=0x%06x\n",
 641                        skb->len, address, dqpn);
 642
 643         /*
 644          * We put the skb into the tx_ring _before_ we call post_send()
 645          * because it's entirely possible that the completion handler will
 646          * run before we execute anything after the post_send().  That
 647          * means we have to make sure everything is properly recorded and
 648          * our state is consistent before we call post_send().
 649          */
 650         tx_req = &priv->tx_ring[priv->tx_head & (ipoib_sendq_size - 1)];
 651         tx_req->skb = skb;
 652         if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req))) {
 653                 ++dev->stats.tx_errors;
 654                 dev_kfree_skb_any(skb);
 655                 return -1;
 656         }
 657
 658         if (skb->ip_summed == CHECKSUM_PARTIAL)
 659                 priv->tx_wr.wr.send_flags |= IB_SEND_IP_CSUM;
 660         else
 661                 priv->tx_wr.wr.send_flags &= ~IB_SEND_IP_CSUM;
 662         /* increase the tx_head after send success, but use it for queue state */
 663         if ((priv->global_tx_head - priv->global_tx_tail) ==
 664             ipoib_sendq_size - 1) {
 665                 ipoib_dbg(priv, "TX ring full, stopping kernel net queue\n");
 666                 netif_stop_queue(dev);
 667         }
 668
 669         skb_orphan(skb);
 670         skb_dst_drop(skb);
 671
 672         if (netif_queue_stopped(dev))
 673                 if (ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP |
 674                                      IB_CQ_REPORT_MISSED_EVENTS) < 0)
 675                         ipoib_warn(priv, "request notify on send CQ failed\n");
 676
 677         rc = post_send(priv, priv->tx_head & (ipoib_sendq_size - 1),
 678                        address, dqpn, tx_req, phead, hlen);
 679         if (unlikely(rc)) {
 680                 ipoib_warn(priv, "post_send failed, error %d\n", rc);
 681                 ++dev->stats.tx_errors;
 682                 ipoib_dma_unmap_tx(priv, tx_req);
 683                 dev_kfree_skb_any(skb);
 684                 if (netif_queue_stopped(dev))
 685                         netif_wake_queue(dev);
 686                 rc = 0;
 687         } else {
 688                 netif_trans_update(dev);
 689
 690                 rc = priv->tx_head;
 691                 ++priv->tx_head;
 692                 ++priv->global_tx_head;
 693         }
 694         return rc;
 695 }
 696
 697 static void ipoib_reap_dead_ahs(struct ipoib_dev_priv *priv)
 698 {
 699         struct ipoib_ah *ah, *tah;
 700         unsigned long flags;
 701
 702         netif_tx_lock_bh(priv->dev);
 703         spin_lock_irqsave(&priv->lock, flags);
 704
 705         list_for_each_entry_safe(ah, tah, &priv->dead_ahs, list)
 706                 if ((int) priv->tx_tail - (int) ah->last_send >= 0) {
 707                         list_del(&ah->list);
 708                         rdma_destroy_ah(ah->ah, 0);
 709                         kfree(ah);
 710                 }
 711
 712         spin_unlock_irqrestore(&priv->lock, flags);
 713         netif_tx_unlock_bh(priv->dev);
 714 }
 715
 716 void ipoib_reap_ah(struct work_struct *work)
 717 {
 718         struct ipoib_dev_priv *priv =
 719                 container_of(work, struct ipoib_dev_priv, ah_reap_task.work);
 720
 721         ipoib_reap_dead_ahs(priv);
 722
 723         if (!test_bit(IPOIB_STOP_REAPER, &priv->flags))
 724                 queue_delayed_work(priv->wq, &priv->ah_reap_task,
 725                                    round_jiffies_relative(HZ));
 726 }
 727
 728 static void ipoib_start_ah_reaper(struct ipoib_dev_priv *priv)
 729 {
 730         clear_bit(IPOIB_STOP_REAPER, &priv->flags);
 731         queue_delayed_work(priv->wq, &priv->ah_reap_task,
 732                            round_jiffies_relative(HZ));
 733 }
 734
 735 static void ipoib_stop_ah_reaper(struct ipoib_dev_priv *priv)
 736 {
 737         set_bit(IPOIB_STOP_REAPER, &priv->flags);
 738         cancel_delayed_work(&priv->ah_reap_task);
 739         /*
 740          * After ipoib_stop_ah_reaper() we always go through
 741          * ipoib_reap_dead_ahs() which ensures the work is really stopped and
 742          * does a final flush out of the dead_ah's list
 743          */
 744 }
 745
 746 static int recvs_pending(struct net_device *dev)
 747 {
 748         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 749         int pending = 0;
 750         int i;
 751
 752         for (i = 0; i < ipoib_recvq_size; ++i)
 753                 if (priv->rx_ring[i].skb)
 754                         ++pending;
 755
 756         return pending;
 757 }
 758
 759 static void check_qp_movement_and_print(struct ipoib_dev_priv *priv,
 760                                         struct ib_qp *qp,
 761                                         enum ib_qp_state new_state)
 762 {
 763         struct ib_qp_attr qp_attr;
 764         struct ib_qp_init_attr query_init_attr;
 765         int ret;
 766
 767         ret = ib_query_qp(qp, &qp_attr, IB_QP_STATE, &query_init_attr);
 768         if (ret) {
 769                 ipoib_warn(priv, "%s: Failed to query QP\n", __func__);
 770                 return;
 771         }
 772         /* print according to the new-state and the previous state.*/
 773         if (new_state == IB_QPS_ERR && qp_attr.qp_state == IB_QPS_RESET)
 774                 ipoib_dbg(priv, "Failed modify QP, IB_QPS_RESET to IB_QPS_ERR, acceptable\n");
 775         else
 776                 ipoib_warn(priv, "Failed to modify QP to state: %d from state: %d\n",
 777                            new_state, qp_attr.qp_state);
 778 }
 779
 780 static void ipoib_napi_enable(struct net_device *dev)
 781 {
 782         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 783
 784         napi_enable(&priv->recv_napi);
 785         napi_enable(&priv->send_napi);
 786 }
 787
 788 static void ipoib_napi_disable(struct net_device *dev)
 789 {
 790         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 791
 792         napi_disable(&priv->recv_napi);
 793         napi_disable(&priv->send_napi);
 794 }
 795
 796 int ipoib_ib_dev_stop_default(struct net_device *dev)
 797 {
 798         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 799         struct ib_qp_attr qp_attr;
 800         unsigned long begin;
 801         struct ipoib_tx_buf *tx_req;
 802         int i;
 803
 804         if (test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
 805                 ipoib_napi_disable(dev);
 806
 807         ipoib_cm_dev_stop(dev);
 808
 809         /*
 810          * Move our QP to the error state and then reinitialize in
 811          * when all work requests have completed or have been flushed.
 812          */
 813         qp_attr.qp_state = IB_QPS_ERR;
 814         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
 815                 check_qp_movement_and_print(priv, priv->qp, IB_QPS_ERR);
 816
 817         /* Wait for all sends and receives to complete */
 818         begin = jiffies;
 819
 820         while (priv->tx_head != priv->tx_tail || recvs_pending(dev)) {
 821                 if (time_after(jiffies, begin + 5 * HZ)) {
 822                         ipoib_warn(priv,
 823                                    "timing out; %d sends %d receives not completed\n",
 824                                    priv->tx_head - priv->tx_tail,
 825                                    recvs_pending(dev));
 826
 827                         /*
 828                          * assume the HW is wedged and just free up
 829                          * all our pending work requests.
 830                          */
 831                         while ((int)priv->tx_tail - (int)priv->tx_head < 0) {
 832                                 tx_req = &priv->tx_ring[priv->tx_tail &
 833                                                         (ipoib_sendq_size - 1)];
 834                                 ipoib_dma_unmap_tx(priv, tx_req);
 835                                 dev_kfree_skb_any(tx_req->skb);
 836                                 ++priv->tx_tail;
 837                                 ++priv->global_tx_tail;
 838                         }
 839
 840                         for (i = 0; i < ipoib_recvq_size; ++i) {
 841                                 struct ipoib_rx_buf *rx_req;
 842
 843                                 rx_req = &priv->rx_ring[i];
 844                                 if (!rx_req->skb)
 845                                         continue;
 846                                 ipoib_ud_dma_unmap_rx(priv,
 847                                                       priv->rx_ring[i].mapping);
 848                                 dev_kfree_skb_any(rx_req->skb);
 849                                 rx_req->skb = NULL;
 850                         }
 851
 852                         goto timeout;
 853                 }
 854
 855                 ipoib_drain_cq(dev);
 856
 857                 usleep_range(1000, 2000);
 858         }
 859
 860         ipoib_dbg(priv, "All sends and receives done.\n");
 861
 862 timeout:
 863         qp_attr.qp_state = IB_QPS_RESET;
 864         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
 865                 ipoib_warn(priv, "Failed to modify QP to RESET state\n");
 866
 867         ib_req_notify_cq(priv->recv_cq, IB_CQ_NEXT_COMP);
 868
 869         return 0;
 870 }
 871
 872 int ipoib_ib_dev_open_default(struct net_device *dev)
 873 {
 874         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 875         int ret;
 876
 877         ret = ipoib_init_qp(dev);
 878         if (ret) {
 879                 ipoib_warn(priv, "ipoib_init_qp returned %d\n", ret);
 880                 return -1;
 881         }
 882
 883         ret = ipoib_ib_post_receives(dev);
 884         if (ret) {
 885                 ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret);
 886                 goto out;
 887         }
 888
 889         ret = ipoib_cm_dev_open(dev);
 890         if (ret) {
 891                 ipoib_warn(priv, "ipoib_cm_dev_open returned %d\n", ret);
 892                 goto out;
 893         }
 894
 895         if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
 896                 ipoib_napi_enable(dev);
 897
 898         return 0;
 899 out:
 900         return -1;
 901 }
 902
 903 int ipoib_ib_dev_open(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_warn(priv, "P_Key 0x%04x is %s\n", priv->pkey,
 911                            (!(priv->pkey & 0x7fff) ? "Invalid" : "not found"));
 912                 return -1;
 913         }
 914
 915         ipoib_start_ah_reaper(priv);
 916         if (priv->rn_ops->ndo_open(dev)) {
 917                 pr_warn("%s: Failed to open dev\n", dev->name);
 918                 goto dev_stop;
 919         }
 920
 921         set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
 922
 923         return 0;
 924
 925 dev_stop:
 926         ipoib_stop_ah_reaper(priv);
 927         return -1;
 928 }
 929
 930 void ipoib_ib_dev_stop(struct net_device *dev)
 931 {
 932         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 933
 934         priv->rn_ops->ndo_stop(dev);
 935
 936         clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
 937         ipoib_stop_ah_reaper(priv);
 938 }
 939
 940 void ipoib_pkey_dev_check_presence(struct net_device *dev)
 941 {
 942         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 943         struct rdma_netdev *rn = netdev_priv(dev);
 944
 945         if (!(priv->pkey & 0x7fff) ||
 946             ib_find_pkey(priv->ca, priv->port, priv->pkey,
 947                          &priv->pkey_index)) {
 948                 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 949         } else {
 950                 if (rn->set_id)
 951                         rn->set_id(dev, priv->pkey_index);
 952                 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 953         }
 954 }
 955
 956 void ipoib_ib_dev_up(struct net_device *dev)
 957 {
 958         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 959
 960         ipoib_pkey_dev_check_presence(dev);
 961
 962         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
 963                 ipoib_dbg(priv, "PKEY is not assigned.\n");
 964                 return;
 965         }
 966
 967         set_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
 968
 969         ipoib_mcast_start_thread(dev);
 970 }
 971
 972 void ipoib_ib_dev_down(struct net_device *dev)
 973 {
 974         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 975
 976         ipoib_dbg(priv, "downing ib_dev\n");
 977
 978         clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
 979         netif_carrier_off(dev);
 980
 981         ipoib_mcast_stop_thread(dev);
 982         ipoib_mcast_dev_flush(dev);
 983
 984         ipoib_flush_paths(dev);
 985 }
 986
 987 void ipoib_drain_cq(struct net_device *dev)
 988 {
 989         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 990         int i, n;
 991
 992         /*
 993          * We call completion handling routines that expect to be
 994          * called from the BH-disabled NAPI poll context, so disable
 995          * BHs here too.
 996          */
 997         local_bh_disable();
 998
 999         do {
1000                 n = ib_poll_cq(priv->recv_cq, IPOIB_NUM_WC, priv->ibwc);
1001                 for (i = 0; i < n; ++i) {
1002                         /*
1003                          * Convert any successful completions to flush
1004                          * errors to avoid passing packets up the
1005                          * stack after bringing the device down.
1006                          */
1007                         if (priv->ibwc[i].status == IB_WC_SUCCESS)
1008                                 priv->ibwc[i].status = IB_WC_WR_FLUSH_ERR;
1009
1010                         if (priv->ibwc[i].wr_id & IPOIB_OP_RECV) {
1011                                 if (priv->ibwc[i].wr_id & IPOIB_OP_CM)
1012                                         ipoib_cm_handle_rx_wc(dev, priv->ibwc + i);
1013                                 else
1014                                         ipoib_ib_handle_rx_wc(dev, priv->ibwc + i);
1015                         } else {
1016                                 pr_warn("%s: Got unexpected wqe id\n", __func__);
1017                         }
1018                 }
1019         } while (n == IPOIB_NUM_WC);
1020
1021         while (poll_tx(priv))
1022                 ; /* nothing */
1023
1024         local_bh_enable();
1025 }
1026
1027 /*
1028  * Takes whatever value which is in pkey index 0 and updates priv->pkey
1029  * returns 0 if the pkey value was changed.
1030  */
1031 static inline int update_parent_pkey(struct ipoib_dev_priv *priv)
1032 {
1033         int result;
1034         u16 prev_pkey;
1035
1036         prev_pkey = priv->pkey;
1037         result = ib_query_pkey(priv->ca, priv->port, 0, &priv->pkey);
1038         if (result) {
1039                 ipoib_warn(priv, "ib_query_pkey port %d failed (ret = %d)\n",
1040                            priv->port, result);
1041                 return result;
1042         }
1043
1044         priv->pkey |= 0x8000;
1045
1046         if (prev_pkey != priv->pkey) {
1047                 ipoib_dbg(priv, "pkey changed from 0x%x to 0x%x\n",
1048                           prev_pkey, priv->pkey);
1049                 /*
1050                  * Update the pkey in the broadcast address, while making sure to set
1051                  * the full membership bit, so that we join the right broadcast group.
1052                  */
1053                 priv->dev->broadcast[8] = priv->pkey >> 8;
1054                 priv->dev->broadcast[9] = priv->pkey & 0xff;
1055                 return 0;
1056         }
1057
1058         return 1;
1059 }
1060 /*
1061  * returns 0 if pkey value was found in a different slot.
1062  */
1063 static inline int update_child_pkey(struct ipoib_dev_priv *priv)
1064 {
1065         u16 old_index = priv->pkey_index;
1066
1067         priv->pkey_index = 0;
1068         ipoib_pkey_dev_check_presence(priv->dev);
1069
1070         if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags) &&
1071             (old_index == priv->pkey_index))
1072                 return 1;
1073         return 0;
1074 }
1075
1076 /*
1077  * returns true if the device address of the ipoib interface has changed and the
1078  * new address is a valid one (i.e in the gid table), return false otherwise.
1079  */
1080 static bool ipoib_dev_addr_changed_valid(struct ipoib_dev_priv *priv)
1081 {
1082         union ib_gid search_gid;
1083         union ib_gid gid0;
1084         int err;
1085         u16 index;
1086         u32 port;
1087         bool ret = false;
1088
1089         if (rdma_query_gid(priv->ca, priv->port, 0, &gid0))
1090                 return false;
1091
1092         netif_addr_lock_bh(priv->dev);
1093
1094         /* The subnet prefix may have changed, update it now so we won't have
1095          * to do it later
1096          */
1097         priv->local_gid.global.subnet_prefix = gid0.global.subnet_prefix;
1098         dev_addr_mod(priv->dev, 4, (u8 *)&gid0.global.subnet_prefix,
1099                      sizeof(gid0.global.subnet_prefix));
1100         search_gid.global.subnet_prefix = gid0.global.subnet_prefix;
1101
1102         search_gid.global.interface_id = priv->local_gid.global.interface_id;
1103
1104         netif_addr_unlock_bh(priv->dev);
1105
1106         err = ib_find_gid(priv->ca, &search_gid, &port, &index);
1107
1108         netif_addr_lock_bh(priv->dev);
1109
1110         if (search_gid.global.interface_id !=
1111             priv->local_gid.global.interface_id)
1112                 /* There was a change while we were looking up the gid, bail
1113                  * here and let the next work sort this out
1114                  */
1115                 goto out;
1116
1117         /* The next section of code needs some background:
1118          * Per IB spec the port GUID can't change if the HCA is powered on.
1119          * port GUID is the basis for GID at index 0 which is the basis for
1120          * the default device address of a ipoib interface.
1121          *
1122          * so it seems the flow should be:
1123          * if user_changed_dev_addr && gid in gid tbl
1124          *      set bit dev_addr_set
1125          *      return true
1126          * else
1127          *      return false
1128          *
1129          * The issue is that there are devices that don't follow the spec,
1130          * they change the port GUID when the HCA is powered, so in order
1131          * not to break userspace applications, We need to check if the
1132          * user wanted to control the device address and we assume that
1133          * if he sets the device address back to be based on GID index 0,
1134          * he no longer wishs to control it.
1135          *
1136          * If the user doesn't control the device address,
1137          * IPOIB_FLAG_DEV_ADDR_SET is set and ib_find_gid failed it means
1138          * the port GUID has changed and GID at index 0 has changed
1139          * so we need to change priv->local_gid and priv->dev->dev_addr
1140          * to reflect the new GID.
1141          */
1142         if (!test_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags)) {
1143                 if (!err && port == priv->port) {
1144                         set_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags);
1145                         if (index == 0)
1146                                 clear_bit(IPOIB_FLAG_DEV_ADDR_CTRL,
1147                                           &priv->flags);
1148                         else
1149                                 set_bit(IPOIB_FLAG_DEV_ADDR_CTRL, &priv->flags);
1150                         ret = true;
1151                 } else {
1152                         ret = false;
1153                 }
1154         } else {
1155                 if (!err && port == priv->port) {
1156                         ret = true;
1157                 } else {
1158                         if (!test_bit(IPOIB_FLAG_DEV_ADDR_CTRL, &priv->flags)) {
1159                                 memcpy(&priv->local_gid, &gid0,
1160                                        sizeof(priv->local_gid));
1161                                 dev_addr_mod(priv->dev, 4, (u8 *)&gid0,
1162                                              sizeof(priv->local_gid));
1163                                 ret = true;
1164                         }
1165                 }
1166         }
1167
1168 out:
1169         netif_addr_unlock_bh(priv->dev);
1170
1171         return ret;
1172 }
1173
1174 static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv,
1175                                 enum ipoib_flush_level level,
1176                                 int nesting)
1177 {
1178         struct ipoib_dev_priv *cpriv;
1179         struct net_device *dev = priv->dev;
1180         int result;
1181
1182         down_read_nested(&priv->vlan_rwsem, nesting);
1183
1184         /*
1185          * Flush any child interfaces too -- they might be up even if
1186          * the parent is down.
1187          */
1188         list_for_each_entry(cpriv, &priv->child_intfs, list)
1189                 __ipoib_ib_dev_flush(cpriv, level, nesting + 1);
1190
1191         up_read(&priv->vlan_rwsem);
1192
1193         if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags) &&
1194             level != IPOIB_FLUSH_HEAVY) {
1195                 /* Make sure the dev_addr is set even if not flushing */
1196                 if (level == IPOIB_FLUSH_LIGHT)
1197                         ipoib_dev_addr_changed_valid(priv);
1198                 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n");
1199                 return;
1200         }
1201
1202         if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
1203                 /* interface is down. update pkey and leave. */
1204                 if (level == IPOIB_FLUSH_HEAVY) {
1205                         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags))
1206                                 update_parent_pkey(priv);
1207                         else
1208                                 update_child_pkey(priv);
1209                 } else if (level == IPOIB_FLUSH_LIGHT)
1210                         ipoib_dev_addr_changed_valid(priv);
1211                 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n");
1212                 return;
1213         }
1214
1215         if (level == IPOIB_FLUSH_HEAVY) {
1216                 /* child devices chase their origin pkey value, while non-child
1217                  * (parent) devices should always takes what present in pkey index 0
1218                  */
1219                 if (test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
1220                         result = update_child_pkey(priv);
1221                         if (result) {
1222                                 /* restart QP only if P_Key index is changed */
1223                                 ipoib_dbg(priv, "Not flushing - P_Key index not changed.\n");
1224                                 return;
1225                         }
1226
1227                 } else {
1228                         result = update_parent_pkey(priv);
1229                         /* restart QP only if P_Key value changed */
1230                         if (result) {
1231                                 ipoib_dbg(priv, "Not flushing - P_Key value not changed.\n");
1232                                 return;
1233                         }
1234                 }
1235         }
1236
1237         if (level == IPOIB_FLUSH_LIGHT) {
1238                 int oper_up;
1239                 ipoib_mark_paths_invalid(dev);
1240                 /* Set IPoIB operation as down to prevent races between:
1241                  * the flush flow which leaves MCG and on the fly joins
1242                  * which can happen during that time. mcast restart task
1243                  * should deal with join requests we missed.
1244                  */
1245                 oper_up = test_and_clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
1246                 ipoib_mcast_dev_flush(dev);
1247                 if (oper_up)
1248                         set_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
1249                 ipoib_reap_dead_ahs(priv);
1250         }
1251
1252         if (level >= IPOIB_FLUSH_NORMAL)
1253                 ipoib_ib_dev_down(dev);
1254
1255         if (level == IPOIB_FLUSH_HEAVY) {
1256                 if (test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
1257                         ipoib_ib_dev_stop(dev);
1258
1259                 if (ipoib_ib_dev_open(dev))
1260                         return;
1261
1262                 if (netif_queue_stopped(dev))
1263                         netif_start_queue(dev);
1264         }
1265
1266         /*
1267          * The device could have been brought down between the start and when
1268          * we get here, don't bring it back up if it's not configured up
1269          */
1270         if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
1271                 if (level >= IPOIB_FLUSH_NORMAL)
1272                         ipoib_ib_dev_up(dev);
1273                 if (ipoib_dev_addr_changed_valid(priv))
1274                         ipoib_mcast_restart_task(&priv->restart_task);
1275         }
1276 }
1277
1278 void ipoib_ib_dev_flush_light(struct work_struct *work)
1279 {
1280         struct ipoib_dev_priv *priv =
1281                 container_of(work, struct ipoib_dev_priv, flush_light);
1282
1283         __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_LIGHT, 0);
1284 }
1285
1286 void ipoib_ib_dev_flush_normal(struct work_struct *work)
1287 {
1288         struct ipoib_dev_priv *priv =
1289                 container_of(work, struct ipoib_dev_priv, flush_normal);
1290
1291         __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_NORMAL, 0);
1292 }
1293
1294 void ipoib_ib_dev_flush_heavy(struct work_struct *work)
1295 {
1296         struct ipoib_dev_priv *priv =
1297                 container_of(work, struct ipoib_dev_priv, flush_heavy);
1298
1299         rtnl_lock();
1300         __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_HEAVY, 0);
1301         rtnl_unlock();
1302 }
1303
1304 void ipoib_ib_dev_cleanup(struct net_device *dev)
1305 {
1306         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1307
1308         ipoib_dbg(priv, "cleaning up ib_dev\n");
1309         /*
1310          * We must make sure there are no more (path) completions
1311          * that may wish to touch priv fields that are no longer valid
1312          */
1313         ipoib_flush_paths(dev);
1314
1315         ipoib_mcast_stop_thread(dev);
1316         ipoib_mcast_dev_flush(dev);
1317
1318         /*
1319          * All of our ah references aren't free until after
1320          * ipoib_mcast_dev_flush(), ipoib_flush_paths, and
1321          * the neighbor garbage collection is stopped and reaped.
1322          * That should all be done now, so make a final ah flush.
1323          */
1324         ipoib_reap_dead_ahs(priv);
1325
1326         clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
1327
1328         priv->rn_ops->ndo_uninit(dev);
1329
1330         if (priv->pd) {
1331                 ib_dealloc_pd(priv->pd);
1332                 priv->pd = NULL;
1333         }
1334 }
1335