git.oblomov.eu Git - linux-2.6/blob - 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          * If we can't allocate a new RX buffer, dump
 201          * this packet and reuse the old buffer.
 202          */
 203         if (unlikely(ipoib_alloc_rx_skb(dev, wr_id))) {
 204                 ++priv->stats.rx_dropped;
 205                 goto repost;
 206         }
 207
 208         ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
 209                        wc->byte_len, wc->slid);
 210
 211         ib_dma_unmap_single(priv->ca, addr, IPOIB_BUF_SIZE, DMA_FROM_DEVICE);
 212
 213         skb_put(skb, wc->byte_len);
 214         skb_pull(skb, IB_GRH_BYTES);
 215
 216         if (wc->slid != priv->local_lid ||
 217             wc->src_qp != priv->qp->qp_num) {
 218                 skb->protocol = ((struct ipoib_header *) skb->data)->proto;
 219                 skb_reset_mac_header(skb);
 220                 skb_pull(skb, IPOIB_ENCAP_LEN);
 221
 222                 dev->last_rx = jiffies;
 223                 ++priv->stats.rx_packets;
 224                 priv->stats.rx_bytes += skb->len;
 225
 226                 skb->dev = dev;
 227                 /* XXX get correct PACKET_ type here */
 228                 skb->pkt_type = PACKET_HOST;
 229                 netif_receive_skb(skb);
 230         } else {
 231                 ipoib_dbg_data(priv, "dropping loopback packet\n");
 232                 dev_kfree_skb_any(skb);
 233         }
 234
 235 repost:
 236         if (unlikely(ipoib_ib_post_receive(dev, wr_id)))
 237                 ipoib_warn(priv, "ipoib_ib_post_receive failed "
 238                            "for buf %d\n", wr_id);
 239 }
 240
 241 static void ipoib_ib_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
 242 {
 243         struct ipoib_dev_priv *priv = netdev_priv(dev);
 244         unsigned int wr_id = wc->wr_id;
 245         struct ipoib_tx_buf *tx_req;
 246         unsigned long flags;
 247
 248         ipoib_dbg_data(priv, "send completion: id %d, status: %d\n",
 249                        wr_id, wc->status);
 250
 251         if (unlikely(wr_id >= ipoib_sendq_size)) {
 252                 ipoib_warn(priv, "send completion event with wrid %d (> %d)\n",
 253                            wr_id, ipoib_sendq_size);
 254                 return;
 255         }
 256
 257         tx_req = &priv->tx_ring[wr_id];
 258
 259         ib_dma_unmap_single(priv->ca, tx_req->mapping,
 260                             tx_req->skb->len, DMA_TO_DEVICE);
 261
 262         ++priv->stats.tx_packets;
 263         priv->stats.tx_bytes += tx_req->skb->len;
 264
 265         dev_kfree_skb_any(tx_req->skb);
 266
 267         spin_lock_irqsave(&priv->tx_lock, flags);
 268         ++priv->tx_tail;
 269         if (unlikely(test_bit(IPOIB_FLAG_NETIF_STOPPED, &priv->flags)) &&
 270             priv->tx_head - priv->tx_tail <= ipoib_sendq_size >> 1) {
 271                 clear_bit(IPOIB_FLAG_NETIF_STOPPED, &priv->flags);
 272                 netif_wake_queue(dev);
 273         }
 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 net_device *dev, int *budget)
 284 {
 285         struct ipoib_dev_priv *priv = netdev_priv(dev);
 286         int max = min(*budget, dev->quota);
 287         int done;
 288         int t;
 289         int empty;
 290         int n, i;
 291
 292         done  = 0;
 293         empty = 0;
 294
 295         while (max) {
 296                 t = min(IPOIB_NUM_WC, max);
 297                 n = ib_poll_cq(priv->cq, t, priv->ibwc);
 298
 299                 for (i = 0; i < n; ++i) {
 300                         struct ib_wc *wc = priv->ibwc + i;
 301
 302                         if (wc->wr_id & IPOIB_CM_OP_SRQ) {
 303                                 ++done;
 304                                 --max;
 305                                 ipoib_cm_handle_rx_wc(dev, wc);
 306                         } else if (wc->wr_id & IPOIB_OP_RECV) {
 307                                 ++done;
 308                                 --max;
 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                         empty = 1;
 316                         break;
 317                 }
 318         }
 319
 320         dev->quota -= done;
 321         *budget    -= done;
 322
 323         if (empty) {
 324                 netif_rx_complete(dev);
 325                 if (unlikely(ib_req_notify_cq(priv->cq,
 326                                               IB_CQ_NEXT_COMP |
 327                                               IB_CQ_REPORT_MISSED_EVENTS)) &&
 328                     netif_rx_reschedule(dev, 0))
 329                         return 1;
 330
 331                 return 0;
 332         }
 333
 334         return 1;
 335 }
 336
 337 void ipoib_ib_completion(struct ib_cq *cq, void *dev_ptr)
 338 {
 339         netif_rx_schedule(dev_ptr);
 340 }
 341
 342 static inline int post_send(struct ipoib_dev_priv *priv,
 343                             unsigned int wr_id,
 344                             struct ib_ah *address, u32 qpn,
 345                             u64 addr, int len)
 346 {
 347         struct ib_send_wr *bad_wr;
 348
 349         priv->tx_sge.addr             = addr;
 350         priv->tx_sge.length           = len;
 351
 352         priv->tx_wr.wr_id             = wr_id;
 353         priv->tx_wr.wr.ud.remote_qpn  = qpn;
 354         priv->tx_wr.wr.ud.ah          = address;
 355
 356         return ib_post_send(priv->qp, &priv->tx_wr, &bad_wr);
 357 }
 358
 359 void ipoib_send(struct net_device *dev, struct sk_buff *skb,
 360                 struct ipoib_ah *address, u32 qpn)
 361 {
 362         struct ipoib_dev_priv *priv = netdev_priv(dev);
 363         struct ipoib_tx_buf *tx_req;
 364         u64 addr;
 365
 366         if (unlikely(skb->len > priv->mcast_mtu + IPOIB_ENCAP_LEN)) {
 367                 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
 368                            skb->len, priv->mcast_mtu + IPOIB_ENCAP_LEN);
 369                 ++priv->stats.tx_dropped;
 370                 ++priv->stats.tx_errors;
 371                 ipoib_cm_skb_too_long(dev, skb, priv->mcast_mtu);
 372                 return;
 373         }
 374
 375         ipoib_dbg_data(priv, "sending packet, length=%d address=%p qpn=0x%06x\n",
 376                        skb->len, address, qpn);
 377
 378         /*
 379          * We put the skb into the tx_ring _before_ we call post_send()
 380          * because it's entirely possible that the completion handler will
 381          * run before we execute anything after the post_send().  That
 382          * means we have to make sure everything is properly recorded and
 383          * our state is consistent before we call post_send().
 384          */
 385         tx_req = &priv->tx_ring[priv->tx_head & (ipoib_sendq_size - 1)];
 386         tx_req->skb = skb;
 387         addr = ib_dma_map_single(priv->ca, skb->data, skb->len,
 388                                  DMA_TO_DEVICE);
 389         if (unlikely(ib_dma_mapping_error(priv->ca, addr))) {
 390                 ++priv->stats.tx_errors;
 391                 dev_kfree_skb_any(skb);
 392                 return;
 393         }
 394         tx_req->mapping = addr;
 395
 396         if (unlikely(post_send(priv, priv->tx_head & (ipoib_sendq_size - 1),
 397                                address->ah, qpn, addr, skb->len))) {
 398                 ipoib_warn(priv, "post_send failed\n");
 399                 ++priv->stats.tx_errors;
 400                 ib_dma_unmap_single(priv->ca, addr, skb->len, DMA_TO_DEVICE);
 401                 dev_kfree_skb_any(skb);
 402         } else {
 403                 dev->trans_start = jiffies;
 404
 405                 address->last_send = priv->tx_head;
 406                 ++priv->tx_head;
 407
 408                 if (priv->tx_head - priv->tx_tail == ipoib_sendq_size) {
 409                         ipoib_dbg(priv, "TX ring full, stopping kernel net queue\n");
 410                         netif_stop_queue(dev);
 411                         set_bit(IPOIB_FLAG_NETIF_STOPPED, &priv->flags);
 412                 }
 413         }
 414 }
 415
 416 static void __ipoib_reap_ah(struct net_device *dev)
 417 {
 418         struct ipoib_dev_priv *priv = netdev_priv(dev);
 419         struct ipoib_ah *ah, *tah;
 420         LIST_HEAD(remove_list);
 421
 422         spin_lock_irq(&priv->tx_lock);
 423         spin_lock(&priv->lock);
 424         list_for_each_entry_safe(ah, tah, &priv->dead_ahs, list)
 425                 if ((int) priv->tx_tail - (int) ah->last_send >= 0) {
 426                         list_del(&ah->list);
 427                         ib_destroy_ah(ah->ah);
 428                         kfree(ah);
 429                 }
 430         spin_unlock(&priv->lock);
 431         spin_unlock_irq(&priv->tx_lock);
 432 }
 433
 434 void ipoib_reap_ah(struct work_struct *work)
 435 {
 436         struct ipoib_dev_priv *priv =
 437                 container_of(work, struct ipoib_dev_priv, ah_reap_task.work);
 438         struct net_device *dev = priv->dev;
 439
 440         __ipoib_reap_ah(dev);
 441
 442         if (!test_bit(IPOIB_STOP_REAPER, &priv->flags))
 443                 queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task, HZ);
 444 }
 445
 446 int ipoib_ib_dev_open(struct net_device *dev)
 447 {
 448         struct ipoib_dev_priv *priv = netdev_priv(dev);
 449         int ret;
 450
 451         if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &priv->pkey_index)) {
 452                 ipoib_warn(priv, "P_Key 0x%04x not found\n", priv->pkey);
 453                 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 454                 return -1;
 455         }
 456         set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 457
 458         ret = ipoib_init_qp(dev);
 459         if (ret) {
 460                 ipoib_warn(priv, "ipoib_init_qp returned %d\n", ret);
 461                 return -1;
 462         }
 463
 464         ret = ipoib_ib_post_receives(dev);
 465         if (ret) {
 466                 ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret);
 467                 ipoib_ib_dev_stop(dev, 1);
 468                 return -1;
 469         }
 470
 471         ret = ipoib_cm_dev_open(dev);
 472         if (ret) {
 473                 ipoib_warn(priv, "ipoib_cm_dev_open returned %d\n", ret);
 474                 ipoib_ib_dev_stop(dev, 1);
 475                 return -1;
 476         }
 477
 478         clear_bit(IPOIB_STOP_REAPER, &priv->flags);
 479         queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task, 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                         if (priv->ibwc[i].wr_id & IPOIB_CM_OP_SRQ)
 561                                 ipoib_cm_handle_rx_wc(dev, priv->ibwc + i);
 562                         else if (priv->ibwc[i].wr_id & IPOIB_OP_RECV)
 563                                 ipoib_ib_handle_rx_wc(dev, priv->ibwc + i);
 564                         else
 565                                 ipoib_ib_handle_tx_wc(dev, priv->ibwc + i);
 566                 }
 567         } while (n == IPOIB_NUM_WC);
 568 }
 569
 570 int ipoib_ib_dev_stop(struct net_device *dev, int flush)
 571 {
 572         struct ipoib_dev_priv *priv = netdev_priv(dev);
 573         struct ib_qp_attr qp_attr;
 574         unsigned long begin;
 575         struct ipoib_tx_buf *tx_req;
 576         int i;
 577
 578         clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
 579         netif_poll_disable(dev);
 580
 581         ipoib_cm_dev_stop(dev);
 582
 583         /*
 584          * Move our QP to the error state and then reinitialize in
 585          * when all work requests have completed or have been flushed.
 586          */
 587         qp_attr.qp_state = IB_QPS_ERR;
 588         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
 589                 ipoib_warn(priv, "Failed to modify QP to ERROR state\n");
 590
 591         /* Wait for all sends and receives to complete */
 592         begin = jiffies;
 593
 594         while (priv->tx_head != priv->tx_tail || recvs_pending(dev)) {
 595                 if (time_after(jiffies, begin + 5 * HZ)) {
 596                         ipoib_warn(priv, "timing out; %d sends %d receives not completed\n",
 597                                    priv->tx_head - priv->tx_tail, recvs_pending(dev));
 598
 599                         /*
 600                          * assume the HW is wedged and just free up
 601                          * all our pending work requests.
 602                          */
 603                         while ((int) priv->tx_tail - (int) priv->tx_head < 0) {
 604                                 tx_req = &priv->tx_ring[priv->tx_tail &
 605                                                         (ipoib_sendq_size - 1)];
 606                                 ib_dma_unmap_single(priv->ca,
 607                                                     tx_req->mapping,
 608                                                     tx_req->skb->len,
 609                                                     DMA_TO_DEVICE);
 610                                 dev_kfree_skb_any(tx_req->skb);
 611                                 ++priv->tx_tail;
 612                         }
 613
 614                         for (i = 0; i < ipoib_recvq_size; ++i) {
 615                                 struct ipoib_rx_buf *rx_req;
 616
 617                                 rx_req = &priv->rx_ring[i];
 618                                 if (!rx_req->skb)
 619                                         continue;
 620                                 ib_dma_unmap_single(priv->ca,
 621                                                     rx_req->mapping,
 622                                                     IPOIB_BUF_SIZE,
 623                                                     DMA_FROM_DEVICE);
 624                                 dev_kfree_skb_any(rx_req->skb);
 625                                 rx_req->skb = NULL;
 626                         }
 627
 628                         goto timeout;
 629                 }
 630
 631                 ipoib_drain_cq(dev);
 632
 633                 msleep(1);
 634         }
 635
 636         ipoib_dbg(priv, "All sends and receives done.\n");
 637
 638 timeout:
 639         qp_attr.qp_state = IB_QPS_RESET;
 640         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
 641                 ipoib_warn(priv, "Failed to modify QP to RESET state\n");
 642
 643         /* Wait for all AHs to be reaped */
 644         set_bit(IPOIB_STOP_REAPER, &priv->flags);
 645         cancel_delayed_work(&priv->ah_reap_task);
 646         if (flush)
 647                 flush_workqueue(ipoib_workqueue);
 648
 649         begin = jiffies;
 650
 651         while (!list_empty(&priv->dead_ahs)) {
 652                 __ipoib_reap_ah(dev);
 653
 654                 if (time_after(jiffies, begin + HZ)) {
 655                         ipoib_warn(priv, "timing out; will leak address handles\n");
 656                         break;
 657                 }
 658
 659                 msleep(1);
 660         }
 661
 662         netif_poll_enable(dev);
 663         ib_req_notify_cq(priv->cq, IB_CQ_NEXT_COMP);
 664
 665         return 0;
 666 }
 667
 668 int ipoib_ib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
 669 {
 670         struct ipoib_dev_priv *priv = netdev_priv(dev);
 671
 672         priv->ca = ca;
 673         priv->port = port;
 674         priv->qp = NULL;
 675
 676         if (ipoib_transport_dev_init(dev, ca)) {
 677                 printk(KERN_WARNING "%s: ipoib_transport_dev_init failed\n", ca->name);
 678                 return -ENODEV;
 679         }
 680
 681         if (dev->flags & IFF_UP) {
 682                 if (ipoib_ib_dev_open(dev)) {
 683                         ipoib_transport_dev_cleanup(dev);
 684                         return -ENODEV;
 685                 }
 686         }
 687
 688         return 0;
 689 }
 690
 691 static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv, int pkey_event)
 692 {
 693         struct ipoib_dev_priv *cpriv;
 694         struct net_device *dev = priv->dev;
 695         u16 new_index;
 696
 697         mutex_lock(&priv->vlan_mutex);
 698
 699         /*
 700          * Flush any child interfaces too -- they might be up even if
 701          * the parent is down.
 702          */
 703         list_for_each_entry(cpriv, &priv->child_intfs, list)
 704                 __ipoib_ib_dev_flush(cpriv, pkey_event);
 705
 706         mutex_unlock(&priv->vlan_mutex);
 707
 708         if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) {
 709                 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n");
 710                 return;
 711         }
 712
 713         if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
 714                 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n");
 715                 return;
 716         }
 717
 718         if (pkey_event) {
 719                 if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &new_index)) {
 720                         clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 721                         ipoib_ib_dev_down(dev, 0);
 722                         ipoib_pkey_dev_delay_open(dev);
 723                         return;
 724                 }
 725                 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 726
 727                 /* restart QP only if P_Key index is changed */
 728                 if (new_index == priv->pkey_index) {
 729                         ipoib_dbg(priv, "Not flushing - P_Key index not changed.\n");
 730                         return;
 731                 }
 732                 priv->pkey_index = new_index;
 733         }
 734
 735         ipoib_dbg(priv, "flushing\n");
 736
 737         ipoib_ib_dev_down(dev, 0);
 738
 739         if (pkey_event) {
 740                 ipoib_ib_dev_stop(dev, 0);
 741                 ipoib_ib_dev_open(dev);
 742         }
 743
 744         /*
 745          * The device could have been brought down between the start and when
 746          * we get here, don't bring it back up if it's not configured up
 747          */
 748         if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
 749                 ipoib_ib_dev_up(dev);
 750                 ipoib_mcast_restart_task(&priv->restart_task);
 751         }
 752 }
 753
 754 void ipoib_ib_dev_flush(struct work_struct *work)
 755 {
 756         struct ipoib_dev_priv *priv =
 757                 container_of(work, struct ipoib_dev_priv, flush_task);
 758
 759         ipoib_dbg(priv, "Flushing %s\n", priv->dev->name);
 760         __ipoib_ib_dev_flush(priv, 0);
 761 }
 762
 763 void ipoib_pkey_event(struct work_struct *work)
 764 {
 765         struct ipoib_dev_priv *priv =
 766                 container_of(work, struct ipoib_dev_priv, pkey_event_task);
 767
 768         ipoib_dbg(priv, "Flushing %s and restarting its QP\n", priv->dev->name);
 769         __ipoib_ib_dev_flush(priv, 1);
 770 }
 771
 772 void ipoib_ib_dev_cleanup(struct net_device *dev)
 773 {
 774         struct ipoib_dev_priv *priv = netdev_priv(dev);
 775
 776         ipoib_dbg(priv, "cleaning up ib_dev\n");
 777
 778         ipoib_mcast_stop_thread(dev, 1);
 779         ipoib_mcast_dev_flush(dev);
 780
 781         ipoib_transport_dev_cleanup(dev);
 782 }
 783
 784 /*
 785  * Delayed P_Key Assigment Interim Support
 786  *
 787  * The following is initial implementation of delayed P_Key assigment
 788  * mechanism. It is using the same approach implemented for the multicast
 789  * group join. The single goal of this implementation is to quickly address
 790  * Bug #2507. This implementation will probably be removed when the P_Key
 791  * change async notification is available.
 792  */
 793
 794 void ipoib_pkey_poll(struct work_struct *work)
 795 {
 796         struct ipoib_dev_priv *priv =
 797                 container_of(work, struct ipoib_dev_priv, pkey_poll_task.work);
 798         struct net_device *dev = priv->dev;
 799
 800         ipoib_pkey_dev_check_presence(dev);
 801
 802         if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags))
 803                 ipoib_open(dev);
 804         else {
 805                 mutex_lock(&pkey_mutex);
 806                 if (!test_bit(IPOIB_PKEY_STOP, &priv->flags))
 807                         queue_delayed_work(ipoib_workqueue,
 808                                            &priv->pkey_poll_task,
 809                                            HZ);
 810                 mutex_unlock(&pkey_mutex);
 811         }
 812 }
 813
 814 int ipoib_pkey_dev_delay_open(struct net_device *dev)
 815 {
 816         struct ipoib_dev_priv *priv = netdev_priv(dev);
 817
 818         /* Look for the interface pkey value in the IB Port P_Key table and */
 819         /* set the interface pkey assigment flag                            */
 820         ipoib_pkey_dev_check_presence(dev);
 821
 822         /* P_Key value not assigned yet - start polling */
 823         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
 824                 mutex_lock(&pkey_mutex);
 825                 clear_bit(IPOIB_PKEY_STOP, &priv->flags);
 826                 queue_delayed_work(ipoib_workqueue,
 827                                    &priv->pkey_poll_task,
 828                                    HZ);
 829                 mutex_unlock(&pkey_mutex);
 830                 return 1;
 831         }
 832
 833         return 0;
 834 }