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(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
 271             netif_queue_stopped(dev) &&
 272             test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
 273                 netif_wake_queue(dev);
 274         spin_unlock_irqrestore(&priv->tx_lock, flags);
 275
 276         if (wc->status != IB_WC_SUCCESS &&
 277             wc->status != IB_WC_WR_FLUSH_ERR)
 278                 ipoib_warn(priv, "failed send event "
 279                            "(status=%d, wrid=%d vend_err %x)\n",
 280                            wc->status, wr_id, wc->vendor_err);
 281 }
 282
 283 int ipoib_poll(struct napi_struct *napi, int budget)
 284 {
 285         struct ipoib_dev_priv *priv = container_of(napi, struct ipoib_dev_priv, napi);
 286         struct net_device *dev = priv->dev;
 287         int done;
 288         int t;
 289         int n, i;
 290
 291         done  = 0;
 292
 293 poll_more:
 294         while (done < budget) {
 295                 int max = (budget - done);
 296
 297                 t = min(IPOIB_NUM_WC, max);
 298                 n = ib_poll_cq(priv->cq, t, priv->ibwc);
 299
 300                 for (i = 0; i < n; i++) {
 301                         struct ib_wc *wc = priv->ibwc + i;
 302
 303                         if (wc->wr_id & IPOIB_OP_RECV) {
 304                                 ++done;
 305                                 if (wc->wr_id & IPOIB_OP_CM)
 306                                         ipoib_cm_handle_rx_wc(dev, wc);
 307                                 else
 308                                         ipoib_ib_handle_rx_wc(dev, wc);
 309                         } else {
 310                                 if (wc->wr_id & IPOIB_OP_CM)
 311                                         ipoib_cm_handle_tx_wc(dev, wc);
 312                                 else
 313                                         ipoib_ib_handle_tx_wc(dev, wc);
 314                         }
 315                 }
 316
 317                 if (n != t)
 318                         break;
 319         }
 320
 321         if (done < budget) {
 322                 netif_rx_complete(dev, napi);
 323                 if (unlikely(ib_req_notify_cq(priv->cq,
 324                                               IB_CQ_NEXT_COMP |
 325                                               IB_CQ_REPORT_MISSED_EVENTS)) &&
 326                     netif_rx_reschedule(dev, napi))
 327                         goto poll_more;
 328         }
 329
 330         return done;
 331 }
 332
 333 void ipoib_ib_completion(struct ib_cq *cq, void *dev_ptr)
 334 {
 335         struct net_device *dev = dev_ptr;
 336         struct ipoib_dev_priv *priv = netdev_priv(dev);
 337
 338         netif_rx_schedule(dev, &priv->napi);
 339 }
 340
 341 static inline int post_send(struct ipoib_dev_priv *priv,
 342                             unsigned int wr_id,
 343                             struct ib_ah *address, u32 qpn,
 344                             u64 addr, int len)
 345 {
 346         struct ib_send_wr *bad_wr;
 347
 348         priv->tx_sge.addr             = addr;
 349         priv->tx_sge.length           = len;
 350
 351         priv->tx_wr.wr_id             = wr_id;
 352         priv->tx_wr.wr.ud.remote_qpn  = qpn;
 353         priv->tx_wr.wr.ud.ah          = address;
 354
 355         return ib_post_send(priv->qp, &priv->tx_wr, &bad_wr);
 356 }
 357
 358 void ipoib_send(struct net_device *dev, struct sk_buff *skb,
 359                 struct ipoib_ah *address, u32 qpn)
 360 {
 361         struct ipoib_dev_priv *priv = netdev_priv(dev);
 362         struct ipoib_tx_buf *tx_req;
 363         u64 addr;
 364
 365         if (unlikely(skb->len > priv->mcast_mtu + IPOIB_ENCAP_LEN)) {
 366                 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
 367                            skb->len, priv->mcast_mtu + IPOIB_ENCAP_LEN);
 368                 ++dev->stats.tx_dropped;
 369                 ++dev->stats.tx_errors;
 370                 ipoib_cm_skb_too_long(dev, skb, priv->mcast_mtu);
 371                 return;
 372         }
 373
 374         ipoib_dbg_data(priv, "sending packet, length=%d address=%p qpn=0x%06x\n",
 375                        skb->len, address, qpn);
 376
 377         /*
 378          * We put the skb into the tx_ring _before_ we call post_send()
 379          * because it's entirely possible that the completion handler will
 380          * run before we execute anything after the post_send().  That
 381          * means we have to make sure everything is properly recorded and
 382          * our state is consistent before we call post_send().
 383          */
 384         tx_req = &priv->tx_ring[priv->tx_head & (ipoib_sendq_size - 1)];
 385         tx_req->skb = skb;
 386         addr = ib_dma_map_single(priv->ca, skb->data, skb->len,
 387                                  DMA_TO_DEVICE);
 388         if (unlikely(ib_dma_mapping_error(priv->ca, addr))) {
 389                 ++dev->stats.tx_errors;
 390                 dev_kfree_skb_any(skb);
 391                 return;
 392         }
 393         tx_req->mapping = addr;
 394
 395         if (unlikely(post_send(priv, priv->tx_head & (ipoib_sendq_size - 1),
 396                                address->ah, qpn, addr, skb->len))) {
 397                 ipoib_warn(priv, "post_send failed\n");
 398                 ++dev->stats.tx_errors;
 399                 ib_dma_unmap_single(priv->ca, addr, skb->len, DMA_TO_DEVICE);
 400                 dev_kfree_skb_any(skb);
 401         } else {
 402                 dev->trans_start = jiffies;
 403
 404                 address->last_send = priv->tx_head;
 405                 ++priv->tx_head;
 406
 407                 if (++priv->tx_outstanding == ipoib_sendq_size) {
 408                         ipoib_dbg(priv, "TX ring full, stopping kernel net queue\n");
 409                         netif_stop_queue(dev);
 410                 }
 411         }
 412 }
 413
 414 static void __ipoib_reap_ah(struct net_device *dev)
 415 {
 416         struct ipoib_dev_priv *priv = netdev_priv(dev);
 417         struct ipoib_ah *ah, *tah;
 418         LIST_HEAD(remove_list);
 419
 420         spin_lock_irq(&priv->tx_lock);
 421         spin_lock(&priv->lock);
 422         list_for_each_entry_safe(ah, tah, &priv->dead_ahs, list)
 423                 if ((int) priv->tx_tail - (int) ah->last_send >= 0) {
 424                         list_del(&ah->list);
 425                         ib_destroy_ah(ah->ah);
 426                         kfree(ah);
 427                 }
 428         spin_unlock(&priv->lock);
 429         spin_unlock_irq(&priv->tx_lock);
 430 }
 431
 432 void ipoib_reap_ah(struct work_struct *work)
 433 {
 434         struct ipoib_dev_priv *priv =
 435                 container_of(work, struct ipoib_dev_priv, ah_reap_task.work);
 436         struct net_device *dev = priv->dev;
 437
 438         __ipoib_reap_ah(dev);
 439
 440         if (!test_bit(IPOIB_STOP_REAPER, &priv->flags))
 441                 queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task,
 442                                    round_jiffies_relative(HZ));
 443 }
 444
 445 int ipoib_ib_dev_open(struct net_device *dev)
 446 {
 447         struct ipoib_dev_priv *priv = netdev_priv(dev);
 448         int ret;
 449
 450         if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &priv->pkey_index)) {
 451                 ipoib_warn(priv, "P_Key 0x%04x not found\n", priv->pkey);
 452                 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 453                 return -1;
 454         }
 455         set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 456
 457         ret = ipoib_init_qp(dev);
 458         if (ret) {
 459                 ipoib_warn(priv, "ipoib_init_qp returned %d\n", ret);
 460                 return -1;
 461         }
 462
 463         ret = ipoib_ib_post_receives(dev);
 464         if (ret) {
 465                 ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret);
 466                 ipoib_ib_dev_stop(dev, 1);
 467                 return -1;
 468         }
 469
 470         ret = ipoib_cm_dev_open(dev);
 471         if (ret) {
 472                 ipoib_warn(priv, "ipoib_cm_dev_open returned %d\n", ret);
 473                 ipoib_ib_dev_stop(dev, 1);
 474                 return -1;
 475         }
 476
 477         clear_bit(IPOIB_STOP_REAPER, &priv->flags);
 478         queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task,
 479                            round_jiffies_relative(HZ));
 480
 481         set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
 482
 483         return 0;
 484 }
 485
 486 static void ipoib_pkey_dev_check_presence(struct net_device *dev)
 487 {
 488         struct ipoib_dev_priv *priv = netdev_priv(dev);
 489         u16 pkey_index = 0;
 490
 491         if (ib_find_cached_pkey(priv->ca, priv->port, priv->pkey, &pkey_index))
 492                 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 493         else
 494                 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 495 }
 496
 497 int ipoib_ib_dev_up(struct net_device *dev)
 498 {
 499         struct ipoib_dev_priv *priv = netdev_priv(dev);
 500
 501         ipoib_pkey_dev_check_presence(dev);
 502
 503         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
 504                 ipoib_dbg(priv, "PKEY is not assigned.\n");
 505                 return 0;
 506         }
 507
 508         set_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
 509
 510         return ipoib_mcast_start_thread(dev);
 511 }
 512
 513 int ipoib_ib_dev_down(struct net_device *dev, int flush)
 514 {
 515         struct ipoib_dev_priv *priv = netdev_priv(dev);
 516
 517         ipoib_dbg(priv, "downing ib_dev\n");
 518
 519         clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
 520         netif_carrier_off(dev);
 521
 522         /* Shutdown the P_Key thread if still active */
 523         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
 524                 mutex_lock(&pkey_mutex);
 525                 set_bit(IPOIB_PKEY_STOP, &priv->flags);
 526                 cancel_delayed_work(&priv->pkey_poll_task);
 527                 mutex_unlock(&pkey_mutex);
 528                 if (flush)
 529                         flush_workqueue(ipoib_workqueue);
 530         }
 531
 532         ipoib_mcast_stop_thread(dev, flush);
 533         ipoib_mcast_dev_flush(dev);
 534
 535         ipoib_flush_paths(dev);
 536
 537         return 0;
 538 }
 539
 540 static int recvs_pending(struct net_device *dev)
 541 {
 542         struct ipoib_dev_priv *priv = netdev_priv(dev);
 543         int pending = 0;
 544         int i;
 545
 546         for (i = 0; i < ipoib_recvq_size; ++i)
 547                 if (priv->rx_ring[i].skb)
 548                         ++pending;
 549
 550         return pending;
 551 }
 552
 553 void ipoib_drain_cq(struct net_device *dev)
 554 {
 555         struct ipoib_dev_priv *priv = netdev_priv(dev);
 556         int i, n;
 557         do {
 558                 n = ib_poll_cq(priv->cq, IPOIB_NUM_WC, priv->ibwc);
 559                 for (i = 0; i < n; ++i) {
 560                         /*
 561                          * Convert any successful completions to flush
 562                          * errors to avoid passing packets up the
 563                          * stack after bringing the device down.
 564                          */
 565                         if (priv->ibwc[i].status == IB_WC_SUCCESS)
 566                                 priv->ibwc[i].status = IB_WC_WR_FLUSH_ERR;
 567
 568                         if (priv->ibwc[i].wr_id & IPOIB_OP_RECV) {
 569                                 if (priv->ibwc[i].wr_id & IPOIB_OP_CM)
 570                                         ipoib_cm_handle_rx_wc(dev, priv->ibwc + i);
 571                                 else
 572                                         ipoib_ib_handle_rx_wc(dev, priv->ibwc + i);
 573                         } else {
 574                                 if (priv->ibwc[i].wr_id & IPOIB_OP_CM)
 575                                         ipoib_cm_handle_tx_wc(dev, priv->ibwc + i);
 576                                 else
 577                                         ipoib_ib_handle_tx_wc(dev, priv->ibwc + i);
 578                         }
 579                 }
 580         } while (n == IPOIB_NUM_WC);
 581 }
 582
 583 int ipoib_ib_dev_stop(struct net_device *dev, int flush)
 584 {
 585         struct ipoib_dev_priv *priv = netdev_priv(dev);
 586         struct ib_qp_attr qp_attr;
 587         unsigned long begin;
 588         struct ipoib_tx_buf *tx_req;
 589         int i;
 590
 591         clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
 592
 593         ipoib_cm_dev_stop(dev);
 594
 595         /*
 596          * Move our QP to the error state and then reinitialize in
 597          * when all work requests have completed or have been flushed.
 598          */
 599         qp_attr.qp_state = IB_QPS_ERR;
 600         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
 601                 ipoib_warn(priv, "Failed to modify QP to ERROR state\n");
 602
 603         /* Wait for all sends and receives to complete */
 604         begin = jiffies;
 605
 606         while (priv->tx_head != priv->tx_tail || recvs_pending(dev)) {
 607                 if (time_after(jiffies, begin + 5 * HZ)) {
 608                         ipoib_warn(priv, "timing out; %d sends %d receives not completed\n",
 609                                    priv->tx_head - priv->tx_tail, recvs_pending(dev));
 610
 611                         /*
 612                          * assume the HW is wedged and just free up
 613                          * all our pending work requests.
 614                          */
 615                         while ((int) priv->tx_tail - (int) priv->tx_head < 0) {
 616                                 tx_req = &priv->tx_ring[priv->tx_tail &
 617                                                         (ipoib_sendq_size - 1)];
 618                                 ib_dma_unmap_single(priv->ca,
 619                                                     tx_req->mapping,
 620                                                     tx_req->skb->len,
 621                                                     DMA_TO_DEVICE);
 622                                 dev_kfree_skb_any(tx_req->skb);
 623                                 ++priv->tx_tail;
 624                                 --priv->tx_outstanding;
 625                         }
 626
 627                         for (i = 0; i < ipoib_recvq_size; ++i) {
 628                                 struct ipoib_rx_buf *rx_req;
 629
 630                                 rx_req = &priv->rx_ring[i];
 631                                 if (!rx_req->skb)
 632                                         continue;
 633                                 ib_dma_unmap_single(priv->ca,
 634                                                     rx_req->mapping,
 635                                                     IPOIB_BUF_SIZE,
 636                                                     DMA_FROM_DEVICE);
 637                                 dev_kfree_skb_any(rx_req->skb);
 638                                 rx_req->skb = NULL;
 639                         }
 640
 641                         goto timeout;
 642                 }
 643
 644                 ipoib_drain_cq(dev);
 645
 646                 msleep(1);
 647         }
 648
 649         ipoib_dbg(priv, "All sends and receives done.\n");
 650
 651 timeout:
 652         qp_attr.qp_state = IB_QPS_RESET;
 653         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
 654                 ipoib_warn(priv, "Failed to modify QP to RESET state\n");
 655
 656         /* Wait for all AHs to be reaped */
 657         set_bit(IPOIB_STOP_REAPER, &priv->flags);
 658         cancel_delayed_work(&priv->ah_reap_task);
 659         if (flush)
 660                 flush_workqueue(ipoib_workqueue);
 661
 662         begin = jiffies;
 663
 664         while (!list_empty(&priv->dead_ahs)) {
 665                 __ipoib_reap_ah(dev);
 666
 667                 if (time_after(jiffies, begin + HZ)) {
 668                         ipoib_warn(priv, "timing out; will leak address handles\n");
 669                         break;
 670                 }
 671
 672                 msleep(1);
 673         }
 674
 675         ib_req_notify_cq(priv->cq, IB_CQ_NEXT_COMP);
 676
 677         return 0;
 678 }
 679
 680 int ipoib_ib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
 681 {
 682         struct ipoib_dev_priv *priv = netdev_priv(dev);
 683
 684         priv->ca = ca;
 685         priv->port = port;
 686         priv->qp = NULL;
 687
 688         if (ipoib_transport_dev_init(dev, ca)) {
 689                 printk(KERN_WARNING "%s: ipoib_transport_dev_init failed\n", ca->name);
 690                 return -ENODEV;
 691         }
 692
 693         if (dev->flags & IFF_UP) {
 694                 if (ipoib_ib_dev_open(dev)) {
 695                         ipoib_transport_dev_cleanup(dev);
 696                         return -ENODEV;
 697                 }
 698         }
 699
 700         return 0;
 701 }
 702
 703 static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv, int pkey_event)
 704 {
 705         struct ipoib_dev_priv *cpriv;
 706         struct net_device *dev = priv->dev;
 707         u16 new_index;
 708
 709         mutex_lock(&priv->vlan_mutex);
 710
 711         /*
 712          * Flush any child interfaces too -- they might be up even if
 713          * the parent is down.
 714          */
 715         list_for_each_entry(cpriv, &priv->child_intfs, list)
 716                 __ipoib_ib_dev_flush(cpriv, pkey_event);
 717
 718         mutex_unlock(&priv->vlan_mutex);
 719
 720         if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) {
 721                 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n");
 722                 return;
 723         }
 724
 725         if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
 726                 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n");
 727                 return;
 728         }
 729
 730         if (pkey_event) {
 731                 if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &new_index)) {
 732                         clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 733                         ipoib_ib_dev_down(dev, 0);
 734                         ipoib_pkey_dev_delay_open(dev);
 735                         return;
 736                 }
 737                 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 738
 739                 /* restart QP only if P_Key index is changed */
 740                 if (new_index == priv->pkey_index) {
 741                         ipoib_dbg(priv, "Not flushing - P_Key index not changed.\n");
 742                         return;
 743                 }
 744                 priv->pkey_index = new_index;
 745         }
 746
 747         ipoib_dbg(priv, "flushing\n");
 748
 749         ipoib_ib_dev_down(dev, 0);
 750
 751         if (pkey_event) {
 752                 ipoib_ib_dev_stop(dev, 0);
 753                 ipoib_ib_dev_open(dev);
 754         }
 755
 756         /*
 757          * The device could have been brought down between the start and when
 758          * we get here, don't bring it back up if it's not configured up
 759          */
 760         if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
 761                 ipoib_ib_dev_up(dev);
 762                 ipoib_mcast_restart_task(&priv->restart_task);
 763         }
 764 }
 765
 766 void ipoib_ib_dev_flush(struct work_struct *work)
 767 {
 768         struct ipoib_dev_priv *priv =
 769                 container_of(work, struct ipoib_dev_priv, flush_task);
 770
 771         ipoib_dbg(priv, "Flushing %s\n", priv->dev->name);
 772         __ipoib_ib_dev_flush(priv, 0);
 773 }
 774
 775 void ipoib_pkey_event(struct work_struct *work)
 776 {
 777         struct ipoib_dev_priv *priv =
 778                 container_of(work, struct ipoib_dev_priv, pkey_event_task);
 779
 780         ipoib_dbg(priv, "Flushing %s and restarting its QP\n", priv->dev->name);
 781         __ipoib_ib_dev_flush(priv, 1);
 782 }
 783
 784 void ipoib_ib_dev_cleanup(struct net_device *dev)
 785 {
 786         struct ipoib_dev_priv *priv = netdev_priv(dev);
 787
 788         ipoib_dbg(priv, "cleaning up ib_dev\n");
 789
 790         ipoib_mcast_stop_thread(dev, 1);
 791         ipoib_mcast_dev_flush(dev);
 792
 793         ipoib_transport_dev_cleanup(dev);
 794 }
 795
 796 /*
 797  * Delayed P_Key Assigment Interim Support
 798  *
 799  * The following is initial implementation of delayed P_Key assigment
 800  * mechanism. It is using the same approach implemented for the multicast
 801  * group join. The single goal of this implementation is to quickly address
 802  * Bug #2507. This implementation will probably be removed when the P_Key
 803  * change async notification is available.
 804  */
 805
 806 void ipoib_pkey_poll(struct work_struct *work)
 807 {
 808         struct ipoib_dev_priv *priv =
 809                 container_of(work, struct ipoib_dev_priv, pkey_poll_task.work);
 810         struct net_device *dev = priv->dev;
 811
 812         ipoib_pkey_dev_check_presence(dev);
 813
 814         if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags))
 815                 ipoib_open(dev);
 816         else {
 817                 mutex_lock(&pkey_mutex);
 818                 if (!test_bit(IPOIB_PKEY_STOP, &priv->flags))
 819                         queue_delayed_work(ipoib_workqueue,
 820                                            &priv->pkey_poll_task,
 821                                            HZ);
 822                 mutex_unlock(&pkey_mutex);
 823         }
 824 }
 825
 826 int ipoib_pkey_dev_delay_open(struct net_device *dev)
 827 {
 828         struct ipoib_dev_priv *priv = netdev_priv(dev);
 829
 830         /* Look for the interface pkey value in the IB Port P_Key table and */
 831         /* set the interface pkey assigment flag                            */
 832         ipoib_pkey_dev_check_presence(dev);
 833
 834         /* P_Key value not assigned yet - start polling */
 835         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
 836                 mutex_lock(&pkey_mutex);
 837                 clear_bit(IPOIB_PKEY_STOP, &priv->flags);
 838                 queue_delayed_work(ipoib_workqueue,
 839                                    &priv->pkey_poll_task,
 840                                    HZ);
 841                 mutex_unlock(&pkey_mutex);
 842                 return 1;
 843         }
 844
 845         return 0;
 846 }