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 static DEFINE_MUTEX(pkey_mutex);
  54
  55 struct ipoib_ah *ipoib_create_ah(struct net_device *dev,
  56                                  struct ib_pd *pd, struct ib_ah_attr *attr)
  57 {
  58         struct ipoib_ah *ah;
  59
  60         ah = kmalloc(sizeof *ah, GFP_KERNEL);
  61         if (!ah)
  62                 return NULL;
  63
  64         ah->dev       = dev;
  65         ah->last_send = 0;
  66         kref_init(&ah->ref);
  67
  68         ah->ah = ib_create_ah(pd, attr);
  69         if (IS_ERR(ah->ah)) {
  70                 kfree(ah);
  71                 ah = NULL;
  72         } else
  73                 ipoib_dbg(netdev_priv(dev), "Created ah %p\n", ah->ah);
  74
  75         return ah;
  76 }
  77
  78 void ipoib_free_ah(struct kref *kref)
  79 {
  80         struct ipoib_ah *ah = container_of(kref, struct ipoib_ah, ref);
  81         struct ipoib_dev_priv *priv = netdev_priv(ah->dev);
  82
  83         unsigned long flags;
  84
  85         spin_lock_irqsave(&priv->lock, flags);
  86         list_add_tail(&ah->list, &priv->dead_ahs);
  87         spin_unlock_irqrestore(&priv->lock, flags);
  88 }
  89
  90 static int ipoib_ib_post_receive(struct net_device *dev, int id)
  91 {
  92         struct ipoib_dev_priv *priv = netdev_priv(dev);
  93         struct ib_sge list;
  94         struct ib_recv_wr param;
  95         struct ib_recv_wr *bad_wr;
  96         int ret;
  97
  98         list.addr     = priv->rx_ring[id].mapping;
  99         list.length   = IPOIB_BUF_SIZE;
 100         list.lkey     = priv->mr->lkey;
 101
 102         param.next    = NULL;
 103         param.wr_id   = id | IPOIB_OP_RECV;
 104         param.sg_list = &list;
 105         param.num_sge = 1;
 106
 107         ret = ib_post_recv(priv->qp, &param, &bad_wr);
 108         if (unlikely(ret)) {
 109                 ipoib_warn(priv, "receive failed for buf %d (%d)\n", id, ret);
 110                 ib_dma_unmap_single(priv->ca, priv->rx_ring[id].mapping,
 111                                     IPOIB_BUF_SIZE, DMA_FROM_DEVICE);
 112                 dev_kfree_skb_any(priv->rx_ring[id].skb);
 113                 priv->rx_ring[id].skb = NULL;
 114         }
 115
 116         return ret;
 117 }
 118
 119 static int ipoib_alloc_rx_skb(struct net_device *dev, int id)
 120 {
 121         struct ipoib_dev_priv *priv = netdev_priv(dev);
 122         struct sk_buff *skb;
 123         u64 addr;
 124
 125         skb = dev_alloc_skb(IPOIB_BUF_SIZE + 4);
 126         if (!skb)
 127                 return -ENOMEM;
 128
 129         /*
 130          * IB will leave a 40 byte gap for a GRH and IPoIB adds a 4 byte
 131          * header.  So we need 4 more bytes to get to 48 and align the
 132          * IP header to a multiple of 16.
 133          */
 134         skb_reserve(skb, 4);
 135
 136         addr = ib_dma_map_single(priv->ca, skb->data, IPOIB_BUF_SIZE,
 137                                  DMA_FROM_DEVICE);
 138         if (unlikely(ib_dma_mapping_error(priv->ca, addr))) {
 139                 dev_kfree_skb_any(skb);
 140                 return -EIO;
 141         }
 142
 143         priv->rx_ring[id].skb     = skb;
 144         priv->rx_ring[id].mapping = addr;
 145
 146         return 0;
 147 }
 148
 149 static int ipoib_ib_post_receives(struct net_device *dev)
 150 {
 151         struct ipoib_dev_priv *priv = netdev_priv(dev);
 152         int i;
 153
 154         for (i = 0; i < ipoib_recvq_size; ++i) {
 155                 if (ipoib_alloc_rx_skb(dev, i)) {
 156                         ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
 157                         return -ENOMEM;
 158                 }
 159                 if (ipoib_ib_post_receive(dev, i)) {
 160                         ipoib_warn(priv, "ipoib_ib_post_receive failed for buf %d\n", i);
 161                         return -EIO;
 162                 }
 163         }
 164
 165         return 0;
 166 }
 167
 168 static void ipoib_ib_handle_rx_wc(struct net_device *dev, struct ib_wc *wc)
 169 {
 170         struct ipoib_dev_priv *priv = netdev_priv(dev);
 171         unsigned int wr_id = wc->wr_id & ~IPOIB_OP_RECV;
 172         struct sk_buff *skb;
 173         u64 addr;
 174
 175         ipoib_dbg_data(priv, "recv completion: id %d, status: %d\n",
 176                        wr_id, wc->status);
 177
 178         if (unlikely(wr_id >= ipoib_recvq_size)) {
 179                 ipoib_warn(priv, "recv completion event with wrid %d (> %d)\n",
 180                            wr_id, ipoib_recvq_size);
 181                 return;
 182         }
 183
 184         skb  = priv->rx_ring[wr_id].skb;
 185         addr = priv->rx_ring[wr_id].mapping;
 186
 187         if (unlikely(wc->status != IB_WC_SUCCESS)) {
 188                 if (wc->status != IB_WC_WR_FLUSH_ERR)
 189                         ipoib_warn(priv, "failed recv event "
 190                                    "(status=%d, wrid=%d vend_err %x)\n",
 191                                    wc->status, wr_id, wc->vendor_err);
 192                 ib_dma_unmap_single(priv->ca, addr,
 193                                     IPOIB_BUF_SIZE, DMA_FROM_DEVICE);
 194                 dev_kfree_skb_any(skb);
 195                 priv->rx_ring[wr_id].skb = NULL;
 196                 return;
 197         }
 198
 199         /*
 200          * Drop packets that this interface sent, ie multicast packets
 201          * that the HCA has replicated.
 202          */
 203         if (wc->slid == priv->local_lid && wc->src_qp == priv->qp->qp_num)
 204                 goto repost;
 205
 206         /*
 207          * If we can't allocate a new RX buffer, dump
 208          * this packet and reuse the old buffer.
 209          */
 210         if (unlikely(ipoib_alloc_rx_skb(dev, wr_id))) {
 211                 ++dev->stats.rx_dropped;
 212                 goto repost;
 213         }
 214
 215         ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
 216                        wc->byte_len, wc->slid);
 217
 218         ib_dma_unmap_single(priv->ca, addr, IPOIB_BUF_SIZE, DMA_FROM_DEVICE);
 219
 220         skb_put(skb, wc->byte_len);
 221         skb_pull(skb, IB_GRH_BYTES);
 222
 223         skb->protocol = ((struct ipoib_header *) skb->data)->proto;
 224         skb_reset_mac_header(skb);
 225         skb_pull(skb, IPOIB_ENCAP_LEN);
 226
 227         dev->last_rx = jiffies;
 228         ++dev->stats.rx_packets;
 229         dev->stats.rx_bytes += skb->len;
 230
 231         skb->dev = dev;
 232         /* XXX get correct PACKET_ type here */
 233         skb->pkt_type = PACKET_HOST;
 234         netif_receive_skb(skb);
 235
 236 repost:
 237         if (unlikely(ipoib_ib_post_receive(dev, wr_id)))
 238                 ipoib_warn(priv, "ipoib_ib_post_receive failed "
 239                            "for buf %d\n", wr_id);
 240 }
 241
 242 static void ipoib_ib_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
 243 {
 244         struct ipoib_dev_priv *priv = netdev_priv(dev);
 245         unsigned int wr_id = wc->wr_id;
 246         struct ipoib_tx_buf *tx_req;
 247         unsigned long flags;
 248
 249         ipoib_dbg_data(priv, "send completion: id %d, status: %d\n",
 250                        wr_id, wc->status);
 251
 252         if (unlikely(wr_id >= ipoib_sendq_size)) {
 253                 ipoib_warn(priv, "send completion event with wrid %d (> %d)\n",
 254                            wr_id, ipoib_sendq_size);
 255                 return;
 256         }
 257
 258         tx_req = &priv->tx_ring[wr_id];
 259
 260         ib_dma_unmap_single(priv->ca, tx_req->mapping,
 261                             tx_req->skb->len, DMA_TO_DEVICE);
 262
 263         ++dev->stats.tx_packets;
 264         dev->stats.tx_bytes += tx_req->skb->len;
 265
 266         dev_kfree_skb_any(tx_req->skb);
 267
 268         spin_lock_irqsave(&priv->tx_lock, flags);
 269         ++priv->tx_tail;
 270         if (unlikely(test_bit(IPOIB_FLAG_NETIF_STOPPED, &priv->flags)) &&
 271             priv->tx_head - priv->tx_tail <= ipoib_sendq_size >> 1) {
 272                 clear_bit(IPOIB_FLAG_NETIF_STOPPED, &priv->flags);
 273                 netif_wake_queue(dev);
 274         }
 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 int ipoib_poll(struct napi_struct *napi, int budget)
 285 {
 286         struct ipoib_dev_priv *priv = container_of(napi, struct ipoib_dev_priv, napi);
 287         struct net_device *dev = priv->dev;
 288         int done;
 289         int t;
 290         int n, i;
 291
 292         done  = 0;
 293
 294 poll_more:
 295         while (done < budget) {
 296                 int max = (budget - done);
 297
 298                 t = min(IPOIB_NUM_WC, max);
 299                 n = ib_poll_cq(priv->cq, t, priv->ibwc);
 300
 301                 for (i = 0; i < n; i++) {
 302                         struct ib_wc *wc = priv->ibwc + i;
 303
 304                         if (wc->wr_id & IPOIB_CM_OP_SRQ) {
 305                                 ++done;
 306                                 ipoib_cm_handle_rx_wc(dev, wc);
 307                         } else if (wc->wr_id & IPOIB_OP_RECV) {
 308                                 ++done;
 309                                 ipoib_ib_handle_rx_wc(dev, wc);
 310                         } else
 311                                 ipoib_ib_handle_tx_wc(dev, wc);
 312                 }
 313
 314                 if (n != t)
 315                         break;
 316         }
 317
 318         if (done < budget) {
 319                 netif_rx_complete(dev, napi);
 320                 if (unlikely(ib_req_notify_cq(priv->cq,
 321                                               IB_CQ_NEXT_COMP |
 322                                               IB_CQ_REPORT_MISSED_EVENTS)) &&
 323                     netif_rx_reschedule(dev, napi))
 324                         goto poll_more;
 325         }
 326
 327         return done;
 328 }
 329
 330 void ipoib_ib_completion(struct ib_cq *cq, void *dev_ptr)
 331 {
 332         struct net_device *dev = dev_ptr;
 333         struct ipoib_dev_priv *priv = netdev_priv(dev);
 334
 335         netif_rx_schedule(dev, &priv->napi);
 336 }
 337
 338 static inline int post_send(struct ipoib_dev_priv *priv,
 339                             unsigned int wr_id,
 340                             struct ib_ah *address, u32 qpn,
 341                             u64 addr, int len)
 342 {
 343         struct ib_send_wr *bad_wr;
 344
 345         priv->tx_sge.addr             = addr;
 346         priv->tx_sge.length           = len;
 347
 348         priv->tx_wr.wr_id             = wr_id;
 349         priv->tx_wr.wr.ud.remote_qpn  = qpn;
 350         priv->tx_wr.wr.ud.ah          = address;
 351
 352         return ib_post_send(priv->qp, &priv->tx_wr, &bad_wr);
 353 }
 354
 355 void ipoib_send(struct net_device *dev, struct sk_buff *skb,
 356                 struct ipoib_ah *address, u32 qpn)
 357 {
 358         struct ipoib_dev_priv *priv = netdev_priv(dev);
 359         struct ipoib_tx_buf *tx_req;
 360         u64 addr;
 361
 362         if (unlikely(skb->len > priv->mcast_mtu + IPOIB_ENCAP_LEN)) {
 363                 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
 364                            skb->len, priv->mcast_mtu + IPOIB_ENCAP_LEN);
 365                 ++dev->stats.tx_dropped;
 366                 ++dev->stats.tx_errors;
 367                 ipoib_cm_skb_too_long(dev, skb, priv->mcast_mtu);
 368                 return;
 369         }
 370
 371         ipoib_dbg_data(priv, "sending packet, length=%d address=%p qpn=0x%06x\n",
 372                        skb->len, address, qpn);
 373
 374         /*
 375          * We put the skb into the tx_ring _before_ we call post_send()
 376          * because it's entirely possible that the completion handler will
 377          * run before we execute anything after the post_send().  That
 378          * means we have to make sure everything is properly recorded and
 379          * our state is consistent before we call post_send().
 380          */
 381         tx_req = &priv->tx_ring[priv->tx_head & (ipoib_sendq_size - 1)];
 382         tx_req->skb = skb;
 383         addr = ib_dma_map_single(priv->ca, skb->data, skb->len,
 384                                  DMA_TO_DEVICE);
 385         if (unlikely(ib_dma_mapping_error(priv->ca, addr))) {
 386                 ++dev->stats.tx_errors;
 387                 dev_kfree_skb_any(skb);
 388                 return;
 389         }
 390         tx_req->mapping = addr;
 391
 392         if (unlikely(post_send(priv, priv->tx_head & (ipoib_sendq_size - 1),
 393                                address->ah, qpn, addr, skb->len))) {
 394                 ipoib_warn(priv, "post_send failed\n");
 395                 ++dev->stats.tx_errors;
 396                 ib_dma_unmap_single(priv->ca, addr, skb->len, DMA_TO_DEVICE);
 397                 dev_kfree_skb_any(skb);
 398         } else {
 399                 dev->trans_start = jiffies;
 400
 401                 address->last_send = priv->tx_head;
 402                 ++priv->tx_head;
 403
 404                 if (priv->tx_head - priv->tx_tail == ipoib_sendq_size) {
 405                         ipoib_dbg(priv, "TX ring full, stopping kernel net queue\n");
 406                         netif_stop_queue(dev);
 407                         set_bit(IPOIB_FLAG_NETIF_STOPPED, &priv->flags);
 408                 }
 409         }
 410 }
 411
 412 static void __ipoib_reap_ah(struct net_device *dev)
 413 {
 414         struct ipoib_dev_priv *priv = netdev_priv(dev);
 415         struct ipoib_ah *ah, *tah;
 416         LIST_HEAD(remove_list);
 417
 418         spin_lock_irq(&priv->tx_lock);
 419         spin_lock(&priv->lock);
 420         list_for_each_entry_safe(ah, tah, &priv->dead_ahs, list)
 421                 if ((int) priv->tx_tail - (int) ah->last_send >= 0) {
 422                         list_del(&ah->list);
 423                         ib_destroy_ah(ah->ah);
 424                         kfree(ah);
 425                 }
 426         spin_unlock(&priv->lock);
 427         spin_unlock_irq(&priv->tx_lock);
 428 }
 429
 430 void ipoib_reap_ah(struct work_struct *work)
 431 {
 432         struct ipoib_dev_priv *priv =
 433                 container_of(work, struct ipoib_dev_priv, ah_reap_task.work);
 434         struct net_device *dev = priv->dev;
 435
 436         __ipoib_reap_ah(dev);
 437
 438         if (!test_bit(IPOIB_STOP_REAPER, &priv->flags))
 439                 queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task,
 440                                    round_jiffies_relative(HZ));
 441 }
 442
 443 int ipoib_ib_dev_open(struct net_device *dev)
 444 {
 445         struct ipoib_dev_priv *priv = netdev_priv(dev);
 446         int ret;
 447
 448         if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &priv->pkey_index)) {
 449                 ipoib_warn(priv, "P_Key 0x%04x not found\n", priv->pkey);
 450                 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 451                 return -1;
 452         }
 453         set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 454
 455         ret = ipoib_init_qp(dev);
 456         if (ret) {
 457                 ipoib_warn(priv, "ipoib_init_qp returned %d\n", ret);
 458                 return -1;
 459         }
 460
 461         ret = ipoib_ib_post_receives(dev);
 462         if (ret) {
 463                 ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret);
 464                 ipoib_ib_dev_stop(dev, 1);
 465                 return -1;
 466         }
 467
 468         ret = ipoib_cm_dev_open(dev);
 469         if (ret) {
 470                 ipoib_warn(priv, "ipoib_cm_dev_open returned %d\n", ret);
 471                 ipoib_ib_dev_stop(dev, 1);
 472                 return -1;
 473         }
 474
 475         clear_bit(IPOIB_STOP_REAPER, &priv->flags);
 476         queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task,
 477                            round_jiffies_relative(HZ));
 478
 479         set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
 480
 481         return 0;
 482 }
 483
 484 static void ipoib_pkey_dev_check_presence(struct net_device *dev)
 485 {
 486         struct ipoib_dev_priv *priv = netdev_priv(dev);
 487         u16 pkey_index = 0;
 488
 489         if (ib_find_cached_pkey(priv->ca, priv->port, priv->pkey, &pkey_index))
 490                 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 491         else
 492                 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 493 }
 494
 495 int ipoib_ib_dev_up(struct net_device *dev)
 496 {
 497         struct ipoib_dev_priv *priv = netdev_priv(dev);
 498
 499         ipoib_pkey_dev_check_presence(dev);
 500
 501         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
 502                 ipoib_dbg(priv, "PKEY is not assigned.\n");
 503                 return 0;
 504         }
 505
 506         set_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
 507
 508         return ipoib_mcast_start_thread(dev);
 509 }
 510
 511 int ipoib_ib_dev_down(struct net_device *dev, int flush)
 512 {
 513         struct ipoib_dev_priv *priv = netdev_priv(dev);
 514
 515         ipoib_dbg(priv, "downing ib_dev\n");
 516
 517         clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
 518         netif_carrier_off(dev);
 519
 520         /* Shutdown the P_Key thread if still active */
 521         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
 522                 mutex_lock(&pkey_mutex);
 523                 set_bit(IPOIB_PKEY_STOP, &priv->flags);
 524                 cancel_delayed_work(&priv->pkey_poll_task);
 525                 mutex_unlock(&pkey_mutex);
 526                 if (flush)
 527                         flush_workqueue(ipoib_workqueue);
 528         }
 529
 530         ipoib_mcast_stop_thread(dev, flush);
 531         ipoib_mcast_dev_flush(dev);
 532
 533         ipoib_flush_paths(dev);
 534
 535         return 0;
 536 }
 537
 538 static int recvs_pending(struct net_device *dev)
 539 {
 540         struct ipoib_dev_priv *priv = netdev_priv(dev);
 541         int pending = 0;
 542         int i;
 543
 544         for (i = 0; i < ipoib_recvq_size; ++i)
 545                 if (priv->rx_ring[i].skb)
 546                         ++pending;
 547
 548         return pending;
 549 }
 550
 551 void ipoib_drain_cq(struct net_device *dev)
 552 {
 553         struct ipoib_dev_priv *priv = netdev_priv(dev);
 554         int i, n;
 555         do {
 556                 n = ib_poll_cq(priv->cq, IPOIB_NUM_WC, priv->ibwc);
 557                 for (i = 0; i < n; ++i) {
 558                         /*
 559                          * Convert any successful completions to flush
 560                          * errors to avoid passing packets up the
 561                          * stack after bringing the device down.
 562                          */
 563                         if (priv->ibwc[i].status == IB_WC_SUCCESS)
 564                                 priv->ibwc[i].status = IB_WC_WR_FLUSH_ERR;
 565
 566                         if (priv->ibwc[i].wr_id & IPOIB_CM_OP_SRQ)
 567                                 ipoib_cm_handle_rx_wc(dev, priv->ibwc + i);
 568                         else if (priv->ibwc[i].wr_id & IPOIB_OP_RECV)
 569                                 ipoib_ib_handle_rx_wc(dev, priv->ibwc + i);
 570                         else
 571                                 ipoib_ib_handle_tx_wc(dev, priv->ibwc + i);
 572                 }
 573         } while (n == IPOIB_NUM_WC);
 574 }
 575
 576 int ipoib_ib_dev_stop(struct net_device *dev, int flush)
 577 {
 578         struct ipoib_dev_priv *priv = netdev_priv(dev);
 579         struct ib_qp_attr qp_attr;
 580         unsigned long begin;
 581         struct ipoib_tx_buf *tx_req;
 582         int i;
 583
 584         clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
 585
 586         ipoib_cm_dev_stop(dev);
 587
 588         /*
 589          * Move our QP to the error state and then reinitialize in
 590          * when all work requests have completed or have been flushed.
 591          */
 592         qp_attr.qp_state = IB_QPS_ERR;
 593         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
 594                 ipoib_warn(priv, "Failed to modify QP to ERROR state\n");
 595
 596         /* Wait for all sends and receives to complete */
 597         begin = jiffies;
 598
 599         while (priv->tx_head != priv->tx_tail || recvs_pending(dev)) {
 600                 if (time_after(jiffies, begin + 5 * HZ)) {
 601                         ipoib_warn(priv, "timing out; %d sends %d receives not completed\n",
 602                                    priv->tx_head - priv->tx_tail, recvs_pending(dev));
 603
 604                         /*
 605                          * assume the HW is wedged and just free up
 606                          * all our pending work requests.
 607                          */
 608                         while ((int) priv->tx_tail - (int) priv->tx_head < 0) {
 609                                 tx_req = &priv->tx_ring[priv->tx_tail &
 610                                                         (ipoib_sendq_size - 1)];
 611                                 ib_dma_unmap_single(priv->ca,
 612                                                     tx_req->mapping,
 613                                                     tx_req->skb->len,
 614                                                     DMA_TO_DEVICE);
 615                                 dev_kfree_skb_any(tx_req->skb);
 616                                 ++priv->tx_tail;
 617                         }
 618
 619                         for (i = 0; i < ipoib_recvq_size; ++i) {
 620                                 struct ipoib_rx_buf *rx_req;
 621
 622                                 rx_req = &priv->rx_ring[i];
 623                                 if (!rx_req->skb)
 624                                         continue;
 625                                 ib_dma_unmap_single(priv->ca,
 626                                                     rx_req->mapping,
 627                                                     IPOIB_BUF_SIZE,
 628                                                     DMA_FROM_DEVICE);
 629                                 dev_kfree_skb_any(rx_req->skb);
 630                                 rx_req->skb = NULL;
 631                         }
 632
 633                         goto timeout;
 634                 }
 635
 636                 ipoib_drain_cq(dev);
 637
 638                 msleep(1);
 639         }
 640
 641         ipoib_dbg(priv, "All sends and receives done.\n");
 642
 643 timeout:
 644         qp_attr.qp_state = IB_QPS_RESET;
 645         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
 646                 ipoib_warn(priv, "Failed to modify QP to RESET state\n");
 647
 648         /* Wait for all AHs to be reaped */
 649         set_bit(IPOIB_STOP_REAPER, &priv->flags);
 650         cancel_delayed_work(&priv->ah_reap_task);
 651         if (flush)
 652                 flush_workqueue(ipoib_workqueue);
 653
 654         begin = jiffies;
 655
 656         while (!list_empty(&priv->dead_ahs)) {
 657                 __ipoib_reap_ah(dev);
 658
 659                 if (time_after(jiffies, begin + HZ)) {
 660                         ipoib_warn(priv, "timing out; will leak address handles\n");
 661                         break;
 662                 }
 663
 664                 msleep(1);
 665         }
 666
 667         ib_req_notify_cq(priv->cq, IB_CQ_NEXT_COMP);
 668
 669         return 0;
 670 }
 671
 672 int ipoib_ib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
 673 {
 674         struct ipoib_dev_priv *priv = netdev_priv(dev);
 675
 676         priv->ca = ca;
 677         priv->port = port;
 678         priv->qp = NULL;
 679
 680         if (ipoib_transport_dev_init(dev, ca)) {
 681                 printk(KERN_WARNING "%s: ipoib_transport_dev_init failed\n", ca->name);
 682                 return -ENODEV;
 683         }
 684
 685         if (dev->flags & IFF_UP) {
 686                 if (ipoib_ib_dev_open(dev)) {
 687                         ipoib_transport_dev_cleanup(dev);
 688                         return -ENODEV;
 689                 }
 690         }
 691
 692         return 0;
 693 }
 694
 695 static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv, int pkey_event)
 696 {
 697         struct ipoib_dev_priv *cpriv;
 698         struct net_device *dev = priv->dev;
 699         u16 new_index;
 700
 701         mutex_lock(&priv->vlan_mutex);
 702
 703         /*
 704          * Flush any child interfaces too -- they might be up even if
 705          * the parent is down.
 706          */
 707         list_for_each_entry(cpriv, &priv->child_intfs, list)
 708                 __ipoib_ib_dev_flush(cpriv, pkey_event);
 709
 710         mutex_unlock(&priv->vlan_mutex);
 711
 712         if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) {
 713                 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n");
 714                 return;
 715         }
 716
 717         if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
 718                 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n");
 719                 return;
 720         }
 721
 722         if (pkey_event) {
 723                 if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &new_index)) {
 724                         clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 725                         ipoib_ib_dev_down(dev, 0);
 726                         ipoib_pkey_dev_delay_open(dev);
 727                         return;
 728                 }
 729                 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 730
 731                 /* restart QP only if P_Key index is changed */
 732                 if (new_index == priv->pkey_index) {
 733                         ipoib_dbg(priv, "Not flushing - P_Key index not changed.\n");
 734                         return;
 735                 }
 736                 priv->pkey_index = new_index;
 737         }
 738
 739         ipoib_dbg(priv, "flushing\n");
 740
 741         ipoib_ib_dev_down(dev, 0);
 742
 743         if (pkey_event) {
 744                 ipoib_ib_dev_stop(dev, 0);
 745                 ipoib_ib_dev_open(dev);
 746         }
 747
 748         /*
 749          * The device could have been brought down between the start and when
 750          * we get here, don't bring it back up if it's not configured up
 751          */
 752         if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
 753                 ipoib_ib_dev_up(dev);
 754                 ipoib_mcast_restart_task(&priv->restart_task);
 755         }
 756 }
 757
 758 void ipoib_ib_dev_flush(struct work_struct *work)
 759 {
 760         struct ipoib_dev_priv *priv =
 761                 container_of(work, struct ipoib_dev_priv, flush_task);
 762
 763         ipoib_dbg(priv, "Flushing %s\n", priv->dev->name);
 764         __ipoib_ib_dev_flush(priv, 0);
 765 }
 766
 767 void ipoib_pkey_event(struct work_struct *work)
 768 {
 769         struct ipoib_dev_priv *priv =
 770                 container_of(work, struct ipoib_dev_priv, pkey_event_task);
 771
 772         ipoib_dbg(priv, "Flushing %s and restarting its QP\n", priv->dev->name);
 773         __ipoib_ib_dev_flush(priv, 1);
 774 }
 775
 776 void ipoib_ib_dev_cleanup(struct net_device *dev)
 777 {
 778         struct ipoib_dev_priv *priv = netdev_priv(dev);
 779
 780         ipoib_dbg(priv, "cleaning up ib_dev\n");
 781
 782         ipoib_mcast_stop_thread(dev, 1);
 783         ipoib_mcast_dev_flush(dev);
 784
 785         ipoib_transport_dev_cleanup(dev);
 786 }
 787
 788 /*
 789  * Delayed P_Key Assigment Interim Support
 790  *
 791  * The following is initial implementation of delayed P_Key assigment
 792  * mechanism. It is using the same approach implemented for the multicast
 793  * group join. The single goal of this implementation is to quickly address
 794  * Bug #2507. This implementation will probably be removed when the P_Key
 795  * change async notification is available.
 796  */
 797
 798 void ipoib_pkey_poll(struct work_struct *work)
 799 {
 800         struct ipoib_dev_priv *priv =
 801                 container_of(work, struct ipoib_dev_priv, pkey_poll_task.work);
 802         struct net_device *dev = priv->dev;
 803
 804         ipoib_pkey_dev_check_presence(dev);
 805
 806         if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags))
 807                 ipoib_open(dev);
 808         else {
 809                 mutex_lock(&pkey_mutex);
 810                 if (!test_bit(IPOIB_PKEY_STOP, &priv->flags))
 811                         queue_delayed_work(ipoib_workqueue,
 812                                            &priv->pkey_poll_task,
 813                                            HZ);
 814                 mutex_unlock(&pkey_mutex);
 815         }
 816 }
 817
 818 int ipoib_pkey_dev_delay_open(struct net_device *dev)
 819 {
 820         struct ipoib_dev_priv *priv = netdev_priv(dev);
 821
 822         /* Look for the interface pkey value in the IB Port P_Key table and */
 823         /* set the interface pkey assigment flag                            */
 824         ipoib_pkey_dev_check_presence(dev);
 825
 826         /* P_Key value not assigned yet - start polling */
 827         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
 828                 mutex_lock(&pkey_mutex);
 829                 clear_bit(IPOIB_PKEY_STOP, &priv->flags);
 830                 queue_delayed_work(ipoib_workqueue,
 831                                    &priv->pkey_poll_task,
 832                                    HZ);
 833                 mutex_unlock(&pkey_mutex);
 834                 return 1;
 835         }
 836
 837         return 0;
 838 }