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  * $Id: ipoib_ib.c 1386 2004-12-27 16:23:17Z roland $
  36  */
  37
  38 #include <linux/delay.h>
  39 #include <linux/dma-mapping.h>
  40
  41 #include <rdma/ib_cache.h>
  42
  43 #include "ipoib.h"
  44
  45 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA
  46 static int data_debug_level;
  47
  48 module_param(data_debug_level, int, 0644);
  49 MODULE_PARM_DESC(data_debug_level,
  50                  "Enable data path debug tracing if > 0");
  51 #endif
  52
  53 #define IPOIB_OP_RECV   (1ul << 31)
  54
  55 static DEFINE_MUTEX(pkey_mutex);
  56
  57 struct ipoib_ah *ipoib_create_ah(struct net_device *dev,
  58                                  struct ib_pd *pd, struct ib_ah_attr *attr)
  59 {
  60         struct ipoib_ah *ah;
  61
  62         ah = kmalloc(sizeof *ah, GFP_KERNEL);
  63         if (!ah)
  64                 return NULL;
  65
  66         ah->dev       = dev;
  67         ah->last_send = 0;
  68         kref_init(&ah->ref);
  69
  70         ah->ah = ib_create_ah(pd, attr);
  71         if (IS_ERR(ah->ah)) {
  72                 kfree(ah);
  73                 ah = NULL;
  74         } else
  75                 ipoib_dbg(netdev_priv(dev), "Created ah %p\n", ah->ah);
  76
  77         return ah;
  78 }
  79
  80 void ipoib_free_ah(struct kref *kref)
  81 {
  82         struct ipoib_ah *ah = container_of(kref, struct ipoib_ah, ref);
  83         struct ipoib_dev_priv *priv = netdev_priv(ah->dev);
  84
  85         unsigned long flags;
  86
  87         spin_lock_irqsave(&priv->lock, flags);
  88         list_add_tail(&ah->list, &priv->dead_ahs);
  89         spin_unlock_irqrestore(&priv->lock, flags);
  90 }
  91
  92 static int ipoib_ib_post_receive(struct net_device *dev, int id)
  93 {
  94         struct ipoib_dev_priv *priv = netdev_priv(dev);
  95         struct ib_sge list;
  96         struct ib_recv_wr param;
  97         struct ib_recv_wr *bad_wr;
  98         int ret;
  99
 100         list.addr     = priv->rx_ring[id].mapping;
 101         list.length   = IPOIB_BUF_SIZE;
 102         list.lkey     = priv->mr->lkey;
 103
 104         param.next    = NULL;
 105         param.wr_id   = id | IPOIB_OP_RECV;
 106         param.sg_list = &list;
 107         param.num_sge = 1;
 108
 109         ret = ib_post_recv(priv->qp, &param, &bad_wr);
 110         if (unlikely(ret)) {
 111                 ipoib_warn(priv, "receive failed for buf %d (%d)\n", id, ret);
 112                 dma_unmap_single(priv->ca->dma_device,
 113                                  priv->rx_ring[id].mapping,
 114                                  IPOIB_BUF_SIZE, DMA_FROM_DEVICE);
 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 int ipoib_alloc_rx_skb(struct net_device *dev, int id)
 123 {
 124         struct ipoib_dev_priv *priv = netdev_priv(dev);
 125         struct sk_buff *skb;
 126         dma_addr_t addr;
 127
 128         skb = dev_alloc_skb(IPOIB_BUF_SIZE + 4);
 129         if (!skb)
 130                 return -ENOMEM;
 131
 132         /*
 133          * IB will leave a 40 byte gap for a GRH and IPoIB adds a 4 byte
 134          * header.  So we need 4 more bytes to get to 48 and align the
 135          * IP header to a multiple of 16.
 136          */
 137         skb_reserve(skb, 4);
 138
 139         addr = dma_map_single(priv->ca->dma_device,
 140                               skb->data, IPOIB_BUF_SIZE,
 141                               DMA_FROM_DEVICE);
 142         if (unlikely(dma_mapping_error(addr))) {
 143                 dev_kfree_skb_any(skb);
 144                 return -EIO;
 145         }
 146
 147         priv->rx_ring[id].skb     = skb;
 148         priv->rx_ring[id].mapping = addr;
 149
 150         return 0;
 151 }
 152
 153 static int ipoib_ib_post_receives(struct net_device *dev)
 154 {
 155         struct ipoib_dev_priv *priv = netdev_priv(dev);
 156         int i;
 157
 158         for (i = 0; i < ipoib_recvq_size; ++i) {
 159                 if (ipoib_alloc_rx_skb(dev, i)) {
 160                         ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
 161                         return -ENOMEM;
 162                 }
 163                 if (ipoib_ib_post_receive(dev, i)) {
 164                         ipoib_warn(priv, "ipoib_ib_post_receive failed for buf %d\n", i);
 165                         return -EIO;
 166                 }
 167         }
 168
 169         return 0;
 170 }
 171
 172 static void ipoib_ib_handle_wc(struct net_device *dev,
 173                                struct ib_wc *wc)
 174 {
 175         struct ipoib_dev_priv *priv = netdev_priv(dev);
 176         unsigned int wr_id = wc->wr_id;
 177
 178         ipoib_dbg_data(priv, "called: id %d, op %d, status: %d\n",
 179                        wr_id, wc->opcode, wc->status);
 180
 181         if (wr_id & IPOIB_OP_RECV) {
 182                 wr_id &= ~IPOIB_OP_RECV;
 183
 184                 if (wr_id < ipoib_recvq_size) {
 185                         struct sk_buff *skb  = priv->rx_ring[wr_id].skb;
 186                         dma_addr_t      addr = priv->rx_ring[wr_id].mapping;
 187
 188                         if (unlikely(wc->status != IB_WC_SUCCESS)) {
 189                                 if (wc->status != IB_WC_WR_FLUSH_ERR)
 190                                         ipoib_warn(priv, "failed recv event "
 191                                                    "(status=%d, wrid=%d vend_err %x)\n",
 192                                                    wc->status, wr_id, wc->vendor_err);
 193                                 dma_unmap_single(priv->ca->dma_device, addr,
 194                                                  IPOIB_BUF_SIZE, DMA_FROM_DEVICE);
 195                                 dev_kfree_skb_any(skb);
 196                                 priv->rx_ring[wr_id].skb = NULL;
 197                                 return;
 198                         }
 199
 200                         /*
 201                          * If we can't allocate a new RX buffer, dump
 202                          * this packet and reuse the old buffer.
 203                          */
 204                         if (unlikely(ipoib_alloc_rx_skb(dev, wr_id))) {
 205                                 ++priv->stats.rx_dropped;
 206                                 goto repost;
 207                         }
 208
 209                         ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
 210                                        wc->byte_len, wc->slid);
 211
 212                         dma_unmap_single(priv->ca->dma_device, addr,
 213                                          IPOIB_BUF_SIZE, DMA_FROM_DEVICE);
 214
 215                         skb_put(skb, wc->byte_len);
 216                         skb_pull(skb, IB_GRH_BYTES);
 217
 218                         if (wc->slid != priv->local_lid ||
 219                             wc->src_qp != priv->qp->qp_num) {
 220                                 skb->protocol = ((struct ipoib_header *) skb->data)->proto;
 221                                 skb->mac.raw = skb->data;
 222                                 skb_pull(skb, IPOIB_ENCAP_LEN);
 223
 224                                 dev->last_rx = jiffies;
 225                                 ++priv->stats.rx_packets;
 226                                 priv->stats.rx_bytes += skb->len;
 227
 228                                 skb->dev = dev;
 229                                 /* XXX get correct PACKET_ type here */
 230                                 skb->pkt_type = PACKET_HOST;
 231                                 netif_rx_ni(skb);
 232                         } else {
 233                                 ipoib_dbg_data(priv, "dropping loopback packet\n");
 234                                 dev_kfree_skb_any(skb);
 235                         }
 236
 237                 repost:
 238                         if (unlikely(ipoib_ib_post_receive(dev, wr_id)))
 239                                 ipoib_warn(priv, "ipoib_ib_post_receive failed "
 240                                            "for buf %d\n", wr_id);
 241                 } else
 242                         ipoib_warn(priv, "completion event with wrid %d\n",
 243                                    wr_id);
 244
 245         } else {
 246                 struct ipoib_tx_buf *tx_req;
 247                 unsigned long flags;
 248
 249                 if (wr_id >= ipoib_sendq_size) {
 250                         ipoib_warn(priv, "completion event with wrid %d (> %d)\n",
 251                                    wr_id, ipoib_sendq_size);
 252                         return;
 253                 }
 254
 255                 ipoib_dbg_data(priv, "send complete, wrid %d\n", wr_id);
 256
 257                 tx_req = &priv->tx_ring[wr_id];
 258
 259                 dma_unmap_single(priv->ca->dma_device,
 260                                  pci_unmap_addr(tx_req, mapping),
 261                                  tx_req->skb->len,
 262                                  DMA_TO_DEVICE);
 263
 264                 ++priv->stats.tx_packets;
 265                 priv->stats.tx_bytes += tx_req->skb->len;
 266
 267                 dev_kfree_skb_any(tx_req->skb);
 268
 269                 spin_lock_irqsave(&priv->tx_lock, flags);
 270                 ++priv->tx_tail;
 271                 if (netif_queue_stopped(dev) &&
 272                     test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags) &&
 273                     priv->tx_head - priv->tx_tail <= ipoib_sendq_size >> 1)
 274                         netif_wake_queue(dev);
 275                 spin_unlock_irqrestore(&priv->tx_lock, flags);
 276
 277                 if (wc->status != IB_WC_SUCCESS &&
 278                     wc->status != IB_WC_WR_FLUSH_ERR)
 279                         ipoib_warn(priv, "failed send event "
 280                                    "(status=%d, wrid=%d vend_err %x)\n",
 281                                    wc->status, wr_id, wc->vendor_err);
 282         }
 283 }
 284
 285 void ipoib_ib_completion(struct ib_cq *cq, void *dev_ptr)
 286 {
 287         struct net_device *dev = (struct net_device *) dev_ptr;
 288         struct ipoib_dev_priv *priv = netdev_priv(dev);
 289         int n, i;
 290
 291         ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
 292         do {
 293                 n = ib_poll_cq(cq, IPOIB_NUM_WC, priv->ibwc);
 294                 for (i = 0; i < n; ++i)
 295                         ipoib_ib_handle_wc(dev, priv->ibwc + i);
 296         } while (n == IPOIB_NUM_WC);
 297 }
 298
 299 static inline int post_send(struct ipoib_dev_priv *priv,
 300                             unsigned int wr_id,
 301                             struct ib_ah *address, u32 qpn,
 302                             dma_addr_t addr, int len)
 303 {
 304         struct ib_send_wr *bad_wr;
 305
 306         priv->tx_sge.addr             = addr;
 307         priv->tx_sge.length           = len;
 308
 309         priv->tx_wr.wr_id             = wr_id;
 310         priv->tx_wr.wr.ud.remote_qpn  = qpn;
 311         priv->tx_wr.wr.ud.ah          = address;
 312
 313         return ib_post_send(priv->qp, &priv->tx_wr, &bad_wr);
 314 }
 315
 316 void ipoib_send(struct net_device *dev, struct sk_buff *skb,
 317                 struct ipoib_ah *address, u32 qpn)
 318 {
 319         struct ipoib_dev_priv *priv = netdev_priv(dev);
 320         struct ipoib_tx_buf *tx_req;
 321         dma_addr_t addr;
 322
 323         if (skb->len > dev->mtu + INFINIBAND_ALEN) {
 324                 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
 325                            skb->len, dev->mtu + INFINIBAND_ALEN);
 326                 ++priv->stats.tx_dropped;
 327                 ++priv->stats.tx_errors;
 328                 dev_kfree_skb_any(skb);
 329                 return;
 330         }
 331
 332         ipoib_dbg_data(priv, "sending packet, length=%d address=%p qpn=0x%06x\n",
 333                        skb->len, address, qpn);
 334
 335         /*
 336          * We put the skb into the tx_ring _before_ we call post_send()
 337          * because it's entirely possible that the completion handler will
 338          * run before we execute anything after the post_send().  That
 339          * means we have to make sure everything is properly recorded and
 340          * our state is consistent before we call post_send().
 341          */
 342         tx_req = &priv->tx_ring[priv->tx_head & (ipoib_sendq_size - 1)];
 343         tx_req->skb = skb;
 344         addr = dma_map_single(priv->ca->dma_device, skb->data, skb->len,
 345                               DMA_TO_DEVICE);
 346         pci_unmap_addr_set(tx_req, mapping, addr);
 347
 348         if (unlikely(post_send(priv, priv->tx_head & (ipoib_sendq_size - 1),
 349                                address->ah, qpn, addr, skb->len))) {
 350                 ipoib_warn(priv, "post_send failed\n");
 351                 ++priv->stats.tx_errors;
 352                 dma_unmap_single(priv->ca->dma_device, addr, skb->len,
 353                                  DMA_TO_DEVICE);
 354                 dev_kfree_skb_any(skb);
 355         } else {
 356                 dev->trans_start = jiffies;
 357
 358                 address->last_send = priv->tx_head;
 359                 ++priv->tx_head;
 360
 361                 if (priv->tx_head - priv->tx_tail == ipoib_sendq_size) {
 362                         ipoib_dbg(priv, "TX ring full, stopping kernel net queue\n");
 363                         netif_stop_queue(dev);
 364                 }
 365         }
 366 }
 367
 368 static void __ipoib_reap_ah(struct net_device *dev)
 369 {
 370         struct ipoib_dev_priv *priv = netdev_priv(dev);
 371         struct ipoib_ah *ah, *tah;
 372         LIST_HEAD(remove_list);
 373
 374         spin_lock_irq(&priv->tx_lock);
 375         spin_lock(&priv->lock);
 376         list_for_each_entry_safe(ah, tah, &priv->dead_ahs, list)
 377                 if ((int) priv->tx_tail - (int) ah->last_send >= 0) {
 378                         list_del(&ah->list);
 379                         ib_destroy_ah(ah->ah);
 380                         kfree(ah);
 381                 }
 382         spin_unlock(&priv->lock);
 383         spin_unlock_irq(&priv->tx_lock);
 384 }
 385
 386 void ipoib_reap_ah(void *dev_ptr)
 387 {
 388         struct net_device *dev = dev_ptr;
 389         struct ipoib_dev_priv *priv = netdev_priv(dev);
 390
 391         __ipoib_reap_ah(dev);
 392
 393         if (!test_bit(IPOIB_STOP_REAPER, &priv->flags))
 394                 queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task, HZ);
 395 }
 396
 397 int ipoib_ib_dev_open(struct net_device *dev)
 398 {
 399         struct ipoib_dev_priv *priv = netdev_priv(dev);
 400         int ret;
 401
 402         ret = ipoib_init_qp(dev);
 403         if (ret) {
 404                 ipoib_warn(priv, "ipoib_init_qp returned %d\n", ret);
 405                 return -1;
 406         }
 407
 408         ret = ipoib_ib_post_receives(dev);
 409         if (ret) {
 410                 ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret);
 411                 ipoib_ib_dev_stop(dev);
 412                 return -1;
 413         }
 414
 415         clear_bit(IPOIB_STOP_REAPER, &priv->flags);
 416         queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task, HZ);
 417
 418         set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
 419
 420         return 0;
 421 }
 422
 423 static void ipoib_pkey_dev_check_presence(struct net_device *dev)
 424 {
 425         struct ipoib_dev_priv *priv = netdev_priv(dev);
 426         u16 pkey_index = 0;
 427
 428         if (ib_find_cached_pkey(priv->ca, priv->port, priv->pkey, &pkey_index))
 429                 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 430         else
 431                 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 432 }
 433
 434 int ipoib_ib_dev_up(struct net_device *dev)
 435 {
 436         struct ipoib_dev_priv *priv = netdev_priv(dev);
 437
 438         ipoib_pkey_dev_check_presence(dev);
 439
 440         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
 441                 ipoib_dbg(priv, "PKEY is not assigned.\n");
 442                 return 0;
 443         }
 444
 445         set_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
 446
 447         return ipoib_mcast_start_thread(dev);
 448 }
 449
 450 int ipoib_ib_dev_down(struct net_device *dev, int flush)
 451 {
 452         struct ipoib_dev_priv *priv = netdev_priv(dev);
 453
 454         ipoib_dbg(priv, "downing ib_dev\n");
 455
 456         clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
 457         netif_carrier_off(dev);
 458
 459         /* Shutdown the P_Key thread if still active */
 460         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
 461                 mutex_lock(&pkey_mutex);
 462                 set_bit(IPOIB_PKEY_STOP, &priv->flags);
 463                 cancel_delayed_work(&priv->pkey_task);
 464                 mutex_unlock(&pkey_mutex);
 465                 if (flush)
 466                         flush_workqueue(ipoib_workqueue);
 467         }
 468
 469         ipoib_mcast_stop_thread(dev, flush);
 470         ipoib_mcast_dev_flush(dev);
 471
 472         ipoib_flush_paths(dev);
 473
 474         return 0;
 475 }
 476
 477 static int recvs_pending(struct net_device *dev)
 478 {
 479         struct ipoib_dev_priv *priv = netdev_priv(dev);
 480         int pending = 0;
 481         int i;
 482
 483         for (i = 0; i < ipoib_recvq_size; ++i)
 484                 if (priv->rx_ring[i].skb)
 485                         ++pending;
 486
 487         return pending;
 488 }
 489
 490 int ipoib_ib_dev_stop(struct net_device *dev)
 491 {
 492         struct ipoib_dev_priv *priv = netdev_priv(dev);
 493         struct ib_qp_attr qp_attr;
 494         unsigned long begin;
 495         struct ipoib_tx_buf *tx_req;
 496         int i;
 497
 498         clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
 499
 500         /*
 501          * Move our QP to the error state and then reinitialize in
 502          * when all work requests have completed or have been flushed.
 503          */
 504         qp_attr.qp_state = IB_QPS_ERR;
 505         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
 506                 ipoib_warn(priv, "Failed to modify QP to ERROR state\n");
 507
 508         /* Wait for all sends and receives to complete */
 509         begin = jiffies;
 510
 511         while (priv->tx_head != priv->tx_tail || recvs_pending(dev)) {
 512                 if (time_after(jiffies, begin + 5 * HZ)) {
 513                         ipoib_warn(priv, "timing out; %d sends %d receives not completed\n",
 514                                    priv->tx_head - priv->tx_tail, recvs_pending(dev));
 515
 516                         /*
 517                          * assume the HW is wedged and just free up
 518                          * all our pending work requests.
 519                          */
 520                         while ((int) priv->tx_tail - (int) priv->tx_head < 0) {
 521                                 tx_req = &priv->tx_ring[priv->tx_tail &
 522                                                         (ipoib_sendq_size - 1)];
 523                                 dma_unmap_single(priv->ca->dma_device,
 524                                                  pci_unmap_addr(tx_req, mapping),
 525                                                  tx_req->skb->len,
 526                                                  DMA_TO_DEVICE);
 527                                 dev_kfree_skb_any(tx_req->skb);
 528                                 ++priv->tx_tail;
 529                         }
 530
 531                         for (i = 0; i < ipoib_recvq_size; ++i)
 532                                 if (priv->rx_ring[i].skb) {
 533                                         dma_unmap_single(priv->ca->dma_device,
 534                                                          pci_unmap_addr(&priv->rx_ring[i],
 535                                                                         mapping),
 536                                                          IPOIB_BUF_SIZE,
 537                                                          DMA_FROM_DEVICE);
 538                                         dev_kfree_skb_any(priv->rx_ring[i].skb);
 539                                         priv->rx_ring[i].skb = NULL;
 540                                 }
 541
 542                         goto timeout;
 543                 }
 544
 545                 msleep(1);
 546         }
 547
 548         ipoib_dbg(priv, "All sends and receives done.\n");
 549
 550 timeout:
 551         qp_attr.qp_state = IB_QPS_RESET;
 552         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
 553                 ipoib_warn(priv, "Failed to modify QP to RESET state\n");
 554
 555         /* Wait for all AHs to be reaped */
 556         set_bit(IPOIB_STOP_REAPER, &priv->flags);
 557         cancel_delayed_work(&priv->ah_reap_task);
 558         flush_workqueue(ipoib_workqueue);
 559
 560         begin = jiffies;
 561
 562         while (!list_empty(&priv->dead_ahs)) {
 563                 __ipoib_reap_ah(dev);
 564
 565                 if (time_after(jiffies, begin + HZ)) {
 566                         ipoib_warn(priv, "timing out; will leak address handles\n");
 567                         break;
 568                 }
 569
 570                 msleep(1);
 571         }
 572
 573         return 0;
 574 }
 575
 576 int ipoib_ib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
 577 {
 578         struct ipoib_dev_priv *priv = netdev_priv(dev);
 579
 580         priv->ca = ca;
 581         priv->port = port;
 582         priv->qp = NULL;
 583
 584         if (ipoib_transport_dev_init(dev, ca)) {
 585                 printk(KERN_WARNING "%s: ipoib_transport_dev_init failed\n", ca->name);
 586                 return -ENODEV;
 587         }
 588
 589         if (dev->flags & IFF_UP) {
 590                 if (ipoib_ib_dev_open(dev)) {
 591                         ipoib_transport_dev_cleanup(dev);
 592                         return -ENODEV;
 593                 }
 594         }
 595
 596         return 0;
 597 }
 598
 599 void ipoib_ib_dev_flush(void *_dev)
 600 {
 601         struct net_device *dev = (struct net_device *)_dev;
 602         struct ipoib_dev_priv *priv = netdev_priv(dev), *cpriv;
 603
 604         if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags) ) {
 605                 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n");
 606                 return;
 607         }
 608
 609         if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
 610                 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n");
 611                 return;
 612         }
 613
 614         ipoib_dbg(priv, "flushing\n");
 615
 616         ipoib_ib_dev_down(dev, 0);
 617
 618         /*
 619          * The device could have been brought down between the start and when
 620          * we get here, don't bring it back up if it's not configured up
 621          */
 622         if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
 623                 ipoib_ib_dev_up(dev);
 624
 625         mutex_lock(&priv->vlan_mutex);
 626
 627         /* Flush any child interfaces too */
 628         list_for_each_entry(cpriv, &priv->child_intfs, list)
 629                 ipoib_ib_dev_flush(cpriv->dev);
 630
 631         mutex_unlock(&priv->vlan_mutex);
 632 }
 633
 634 void ipoib_ib_dev_cleanup(struct net_device *dev)
 635 {
 636         struct ipoib_dev_priv *priv = netdev_priv(dev);
 637
 638         ipoib_dbg(priv, "cleaning up ib_dev\n");
 639
 640         ipoib_mcast_stop_thread(dev, 1);
 641         ipoib_mcast_dev_flush(dev);
 642
 643         ipoib_transport_dev_cleanup(dev);
 644 }
 645
 646 /*
 647  * Delayed P_Key Assigment Interim Support
 648  *
 649  * The following is initial implementation of delayed P_Key assigment
 650  * mechanism. It is using the same approach implemented for the multicast
 651  * group join. The single goal of this implementation is to quickly address
 652  * Bug #2507. This implementation will probably be removed when the P_Key
 653  * change async notification is available.
 654  */
 655
 656 void ipoib_pkey_poll(void *dev_ptr)
 657 {
 658         struct net_device *dev = dev_ptr;
 659         struct ipoib_dev_priv *priv = netdev_priv(dev);
 660
 661         ipoib_pkey_dev_check_presence(dev);
 662
 663         if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags))
 664                 ipoib_open(dev);
 665         else {
 666                 mutex_lock(&pkey_mutex);
 667                 if (!test_bit(IPOIB_PKEY_STOP, &priv->flags))
 668                         queue_delayed_work(ipoib_workqueue,
 669                                            &priv->pkey_task,
 670                                            HZ);
 671                 mutex_unlock(&pkey_mutex);
 672         }
 673 }
 674
 675 int ipoib_pkey_dev_delay_open(struct net_device *dev)
 676 {
 677         struct ipoib_dev_priv *priv = netdev_priv(dev);
 678
 679         /* Look for the interface pkey value in the IB Port P_Key table and */
 680         /* set the interface pkey assigment flag                            */
 681         ipoib_pkey_dev_check_presence(dev);
 682
 683         /* P_Key value not assigned yet - start polling */
 684         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
 685                 mutex_lock(&pkey_mutex);
 686                 clear_bit(IPOIB_PKEY_STOP, &priv->flags);
 687                 queue_delayed_work(ipoib_workqueue,
 688                                    &priv->pkey_task,
 689                                    HZ);
 690                 mutex_unlock(&pkey_mutex);
 691                 return 1;
 692         }
 693
 694         return 0;
 695 }