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, HZ);
 440 }
 441
 442 int ipoib_ib_dev_open(struct net_device *dev)
 443 {
 444         struct ipoib_dev_priv *priv = netdev_priv(dev);
 445         int ret;
 446
 447         if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &priv->pkey_index)) {
 448                 ipoib_warn(priv, "P_Key 0x%04x not found\n", priv->pkey);
 449                 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 450                 return -1;
 451         }
 452         set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 453
 454         ret = ipoib_init_qp(dev);
 455         if (ret) {
 456                 ipoib_warn(priv, "ipoib_init_qp returned %d\n", ret);
 457                 return -1;
 458         }
 459
 460         ret = ipoib_ib_post_receives(dev);
 461         if (ret) {
 462                 ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret);
 463                 ipoib_ib_dev_stop(dev, 1);
 464                 return -1;
 465         }
 466
 467         ret = ipoib_cm_dev_open(dev);
 468         if (ret) {
 469                 ipoib_warn(priv, "ipoib_cm_dev_open returned %d\n", ret);
 470                 ipoib_ib_dev_stop(dev, 1);
 471                 return -1;
 472         }
 473
 474         clear_bit(IPOIB_STOP_REAPER, &priv->flags);
 475         queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task, HZ);
 476
 477         set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
 478
 479         return 0;
 480 }
 481
 482 static void ipoib_pkey_dev_check_presence(struct net_device *dev)
 483 {
 484         struct ipoib_dev_priv *priv = netdev_priv(dev);
 485         u16 pkey_index = 0;
 486
 487         if (ib_find_cached_pkey(priv->ca, priv->port, priv->pkey, &pkey_index))
 488                 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 489         else
 490                 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 491 }
 492
 493 int ipoib_ib_dev_up(struct net_device *dev)
 494 {
 495         struct ipoib_dev_priv *priv = netdev_priv(dev);
 496
 497         ipoib_pkey_dev_check_presence(dev);
 498
 499         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
 500                 ipoib_dbg(priv, "PKEY is not assigned.\n");
 501                 return 0;
 502         }
 503
 504         set_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
 505
 506         return ipoib_mcast_start_thread(dev);
 507 }
 508
 509 int ipoib_ib_dev_down(struct net_device *dev, int flush)
 510 {
 511         struct ipoib_dev_priv *priv = netdev_priv(dev);
 512
 513         ipoib_dbg(priv, "downing ib_dev\n");
 514
 515         clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
 516         netif_carrier_off(dev);
 517
 518         /* Shutdown the P_Key thread if still active */
 519         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
 520                 mutex_lock(&pkey_mutex);
 521                 set_bit(IPOIB_PKEY_STOP, &priv->flags);
 522                 cancel_delayed_work(&priv->pkey_poll_task);
 523                 mutex_unlock(&pkey_mutex);
 524                 if (flush)
 525                         flush_workqueue(ipoib_workqueue);
 526         }
 527
 528         ipoib_mcast_stop_thread(dev, flush);
 529         ipoib_mcast_dev_flush(dev);
 530
 531         ipoib_flush_paths(dev);
 532
 533         return 0;
 534 }
 535
 536 static int recvs_pending(struct net_device *dev)
 537 {
 538         struct ipoib_dev_priv *priv = netdev_priv(dev);
 539         int pending = 0;
 540         int i;
 541
 542         for (i = 0; i < ipoib_recvq_size; ++i)
 543                 if (priv->rx_ring[i].skb)
 544                         ++pending;
 545
 546         return pending;
 547 }
 548
 549 void ipoib_drain_cq(struct net_device *dev)
 550 {
 551         struct ipoib_dev_priv *priv = netdev_priv(dev);
 552         int i, n;
 553         do {
 554                 n = ib_poll_cq(priv->cq, IPOIB_NUM_WC, priv->ibwc);
 555                 for (i = 0; i < n; ++i) {
 556                         /*
 557                          * Convert any successful completions to flush
 558                          * errors to avoid passing packets up the
 559                          * stack after bringing the device down.
 560                          */
 561                         if (priv->ibwc[i].status == IB_WC_SUCCESS)
 562                                 priv->ibwc[i].status = IB_WC_WR_FLUSH_ERR;
 563
 564                         if (priv->ibwc[i].wr_id & IPOIB_CM_OP_SRQ)
 565                                 ipoib_cm_handle_rx_wc(dev, priv->ibwc + i);
 566                         else if (priv->ibwc[i].wr_id & IPOIB_OP_RECV)
 567                                 ipoib_ib_handle_rx_wc(dev, priv->ibwc + i);
 568                         else
 569                                 ipoib_ib_handle_tx_wc(dev, priv->ibwc + i);
 570                 }
 571         } while (n == IPOIB_NUM_WC);
 572 }
 573
 574 int ipoib_ib_dev_stop(struct net_device *dev, int flush)
 575 {
 576         struct ipoib_dev_priv *priv = netdev_priv(dev);
 577         struct ib_qp_attr qp_attr;
 578         unsigned long begin;
 579         struct ipoib_tx_buf *tx_req;
 580         int i;
 581
 582         clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
 583
 584         ipoib_cm_dev_stop(dev);
 585
 586         /*
 587          * Move our QP to the error state and then reinitialize in
 588          * when all work requests have completed or have been flushed.
 589          */
 590         qp_attr.qp_state = IB_QPS_ERR;
 591         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
 592                 ipoib_warn(priv, "Failed to modify QP to ERROR state\n");
 593
 594         /* Wait for all sends and receives to complete */
 595         begin = jiffies;
 596
 597         while (priv->tx_head != priv->tx_tail || recvs_pending(dev)) {
 598                 if (time_after(jiffies, begin + 5 * HZ)) {
 599                         ipoib_warn(priv, "timing out; %d sends %d receives not completed\n",
 600                                    priv->tx_head - priv->tx_tail, recvs_pending(dev));
 601
 602                         /*
 603                          * assume the HW is wedged and just free up
 604                          * all our pending work requests.
 605                          */
 606                         while ((int) priv->tx_tail - (int) priv->tx_head < 0) {
 607                                 tx_req = &priv->tx_ring[priv->tx_tail &
 608                                                         (ipoib_sendq_size - 1)];
 609                                 ib_dma_unmap_single(priv->ca,
 610                                                     tx_req->mapping,
 611                                                     tx_req->skb->len,
 612                                                     DMA_TO_DEVICE);
 613                                 dev_kfree_skb_any(tx_req->skb);
 614                                 ++priv->tx_tail;
 615                         }
 616
 617                         for (i = 0; i < ipoib_recvq_size; ++i) {
 618                                 struct ipoib_rx_buf *rx_req;
 619
 620                                 rx_req = &priv->rx_ring[i];
 621                                 if (!rx_req->skb)
 622                                         continue;
 623                                 ib_dma_unmap_single(priv->ca,
 624                                                     rx_req->mapping,
 625                                                     IPOIB_BUF_SIZE,
 626                                                     DMA_FROM_DEVICE);
 627                                 dev_kfree_skb_any(rx_req->skb);
 628                                 rx_req->skb = NULL;
 629                         }
 630
 631                         goto timeout;
 632                 }
 633
 634                 ipoib_drain_cq(dev);
 635
 636                 msleep(1);
 637         }
 638
 639         ipoib_dbg(priv, "All sends and receives done.\n");
 640
 641 timeout:
 642         qp_attr.qp_state = IB_QPS_RESET;
 643         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
 644                 ipoib_warn(priv, "Failed to modify QP to RESET state\n");
 645
 646         /* Wait for all AHs to be reaped */
 647         set_bit(IPOIB_STOP_REAPER, &priv->flags);
 648         cancel_delayed_work(&priv->ah_reap_task);
 649         if (flush)
 650                 flush_workqueue(ipoib_workqueue);
 651
 652         begin = jiffies;
 653
 654         while (!list_empty(&priv->dead_ahs)) {
 655                 __ipoib_reap_ah(dev);
 656
 657                 if (time_after(jiffies, begin + HZ)) {
 658                         ipoib_warn(priv, "timing out; will leak address handles\n");
 659                         break;
 660                 }
 661
 662                 msleep(1);
 663         }
 664
 665         ib_req_notify_cq(priv->cq, IB_CQ_NEXT_COMP);
 666
 667         return 0;
 668 }
 669
 670 int ipoib_ib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
 671 {
 672         struct ipoib_dev_priv *priv = netdev_priv(dev);
 673
 674         priv->ca = ca;
 675         priv->port = port;
 676         priv->qp = NULL;
 677
 678         if (ipoib_transport_dev_init(dev, ca)) {
 679                 printk(KERN_WARNING "%s: ipoib_transport_dev_init failed\n", ca->name);
 680                 return -ENODEV;
 681         }
 682
 683         if (dev->flags & IFF_UP) {
 684                 if (ipoib_ib_dev_open(dev)) {
 685                         ipoib_transport_dev_cleanup(dev);
 686                         return -ENODEV;
 687                 }
 688         }
 689
 690         return 0;
 691 }
 692
 693 static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv, int pkey_event)
 694 {
 695         struct ipoib_dev_priv *cpriv;
 696         struct net_device *dev = priv->dev;
 697         u16 new_index;
 698
 699         mutex_lock(&priv->vlan_mutex);
 700
 701         /*
 702          * Flush any child interfaces too -- they might be up even if
 703          * the parent is down.
 704          */
 705         list_for_each_entry(cpriv, &priv->child_intfs, list)
 706                 __ipoib_ib_dev_flush(cpriv, pkey_event);
 707
 708         mutex_unlock(&priv->vlan_mutex);
 709
 710         if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) {
 711                 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n");
 712                 return;
 713         }
 714
 715         if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
 716                 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n");
 717                 return;
 718         }
 719
 720         if (pkey_event) {
 721                 if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &new_index)) {
 722                         clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 723                         ipoib_ib_dev_down(dev, 0);
 724                         ipoib_pkey_dev_delay_open(dev);
 725                         return;
 726                 }
 727                 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 728
 729                 /* restart QP only if P_Key index is changed */
 730                 if (new_index == priv->pkey_index) {
 731                         ipoib_dbg(priv, "Not flushing - P_Key index not changed.\n");
 732                         return;
 733                 }
 734                 priv->pkey_index = new_index;
 735         }
 736
 737         ipoib_dbg(priv, "flushing\n");
 738
 739         ipoib_ib_dev_down(dev, 0);
 740
 741         if (pkey_event) {
 742                 ipoib_ib_dev_stop(dev, 0);
 743                 ipoib_ib_dev_open(dev);
 744         }
 745
 746         /*
 747          * The device could have been brought down between the start and when
 748          * we get here, don't bring it back up if it's not configured up
 749          */
 750         if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
 751                 ipoib_ib_dev_up(dev);
 752                 ipoib_mcast_restart_task(&priv->restart_task);
 753         }
 754 }
 755
 756 void ipoib_ib_dev_flush(struct work_struct *work)
 757 {
 758         struct ipoib_dev_priv *priv =
 759                 container_of(work, struct ipoib_dev_priv, flush_task);
 760
 761         ipoib_dbg(priv, "Flushing %s\n", priv->dev->name);
 762         __ipoib_ib_dev_flush(priv, 0);
 763 }
 764
 765 void ipoib_pkey_event(struct work_struct *work)
 766 {
 767         struct ipoib_dev_priv *priv =
 768                 container_of(work, struct ipoib_dev_priv, pkey_event_task);
 769
 770         ipoib_dbg(priv, "Flushing %s and restarting its QP\n", priv->dev->name);
 771         __ipoib_ib_dev_flush(priv, 1);
 772 }
 773
 774 void ipoib_ib_dev_cleanup(struct net_device *dev)
 775 {
 776         struct ipoib_dev_priv *priv = netdev_priv(dev);
 777
 778         ipoib_dbg(priv, "cleaning up ib_dev\n");
 779
 780         ipoib_mcast_stop_thread(dev, 1);
 781         ipoib_mcast_dev_flush(dev);
 782
 783         ipoib_transport_dev_cleanup(dev);
 784 }
 785
 786 /*
 787  * Delayed P_Key Assigment Interim Support
 788  *
 789  * The following is initial implementation of delayed P_Key assigment
 790  * mechanism. It is using the same approach implemented for the multicast
 791  * group join. The single goal of this implementation is to quickly address
 792  * Bug #2507. This implementation will probably be removed when the P_Key
 793  * change async notification is available.
 794  */
 795
 796 void ipoib_pkey_poll(struct work_struct *work)
 797 {
 798         struct ipoib_dev_priv *priv =
 799                 container_of(work, struct ipoib_dev_priv, pkey_poll_task.work);
 800         struct net_device *dev = priv->dev;
 801
 802         ipoib_pkey_dev_check_presence(dev);
 803
 804         if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags))
 805                 ipoib_open(dev);
 806         else {
 807                 mutex_lock(&pkey_mutex);
 808                 if (!test_bit(IPOIB_PKEY_STOP, &priv->flags))
 809                         queue_delayed_work(ipoib_workqueue,
 810                                            &priv->pkey_poll_task,
 811                                            HZ);
 812                 mutex_unlock(&pkey_mutex);
 813         }
 814 }
 815
 816 int ipoib_pkey_dev_delay_open(struct net_device *dev)
 817 {
 818         struct ipoib_dev_priv *priv = netdev_priv(dev);
 819
 820         /* Look for the interface pkey value in the IB Port P_Key table and */
 821         /* set the interface pkey assigment flag                            */
 822         ipoib_pkey_dev_check_presence(dev);
 823
 824         /* P_Key value not assigned yet - start polling */
 825         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
 826                 mutex_lock(&pkey_mutex);
 827                 clear_bit(IPOIB_PKEY_STOP, &priv->flags);
 828                 queue_delayed_work(ipoib_workqueue,
 829                                    &priv->pkey_poll_task,
 830                                    HZ);
 831                 mutex_unlock(&pkey_mutex);
 832                 return 1;
 833         }
 834
 835         return 0;
 836 }