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 #include <linux/ip.h>
  43 #include <linux/tcp.h>
  44
  45 #include "ipoib.h"
  46
  47 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA
  48 static int data_debug_level;
  49
  50 module_param(data_debug_level, int, 0644);
  51 MODULE_PARM_DESC(data_debug_level,
  52                  "Enable data path debug tracing if > 0");
  53 #endif
  54
  55 static DEFINE_MUTEX(pkey_mutex);
  56
  57 struct ipoib_ah *ipoib_create_ah(struct net_device *dev,
  58                                  struct ib_pd *pd, struct ib_ah_attr *attr)
  59 {
  60         struct ipoib_ah *ah;
  61
  62         ah = kmalloc(sizeof *ah, GFP_KERNEL);
  63         if (!ah)
  64                 return NULL;
  65
  66         ah->dev       = dev;
  67         ah->last_send = 0;
  68         kref_init(&ah->ref);
  69
  70         ah->ah = ib_create_ah(pd, attr);
  71         if (IS_ERR(ah->ah)) {
  72                 kfree(ah);
  73                 ah = NULL;
  74         } else
  75                 ipoib_dbg(netdev_priv(dev), "Created ah %p\n", ah->ah);
  76
  77         return ah;
  78 }
  79
  80 void ipoib_free_ah(struct kref *kref)
  81 {
  82         struct ipoib_ah *ah = container_of(kref, struct ipoib_ah, ref);
  83         struct ipoib_dev_priv *priv = netdev_priv(ah->dev);
  84
  85         unsigned long flags;
  86
  87         spin_lock_irqsave(&priv->lock, flags);
  88         list_add_tail(&ah->list, &priv->dead_ahs);
  89         spin_unlock_irqrestore(&priv->lock, flags);
  90 }
  91
  92 static int ipoib_ib_post_receive(struct net_device *dev, int id)
  93 {
  94         struct ipoib_dev_priv *priv = netdev_priv(dev);
  95         struct ib_sge list;
  96         struct ib_recv_wr param;
  97         struct ib_recv_wr *bad_wr;
  98         int ret;
  99
 100         list.addr     = priv->rx_ring[id].mapping;
 101         list.length   = IPOIB_BUF_SIZE;
 102         list.lkey     = priv->mr->lkey;
 103
 104         param.next    = NULL;
 105         param.wr_id   = id | IPOIB_OP_RECV;
 106         param.sg_list = &list;
 107         param.num_sge = 1;
 108
 109         ret = ib_post_recv(priv->qp, &param, &bad_wr);
 110         if (unlikely(ret)) {
 111                 ipoib_warn(priv, "receive failed for buf %d (%d)\n", id, ret);
 112                 ib_dma_unmap_single(priv->ca, priv->rx_ring[id].mapping,
 113                                     IPOIB_BUF_SIZE, DMA_FROM_DEVICE);
 114                 dev_kfree_skb_any(priv->rx_ring[id].skb);
 115                 priv->rx_ring[id].skb = NULL;
 116         }
 117
 118         return ret;
 119 }
 120
 121 static int ipoib_alloc_rx_skb(struct net_device *dev, int id)
 122 {
 123         struct ipoib_dev_priv *priv = netdev_priv(dev);
 124         struct sk_buff *skb;
 125         u64 addr;
 126
 127         skb = dev_alloc_skb(IPOIB_BUF_SIZE + 4);
 128         if (!skb)
 129                 return -ENOMEM;
 130
 131         /*
 132          * IB will leave a 40 byte gap for a GRH and IPoIB adds a 4 byte
 133          * header.  So we need 4 more bytes to get to 48 and align the
 134          * IP header to a multiple of 16.
 135          */
 136         skb_reserve(skb, 4);
 137
 138         addr = ib_dma_map_single(priv->ca, skb->data, IPOIB_BUF_SIZE,
 139                                  DMA_FROM_DEVICE);
 140         if (unlikely(ib_dma_mapping_error(priv->ca, addr))) {
 141                 dev_kfree_skb_any(skb);
 142                 return -EIO;
 143         }
 144
 145         priv->rx_ring[id].skb     = skb;
 146         priv->rx_ring[id].mapping = addr;
 147
 148         return 0;
 149 }
 150
 151 static int ipoib_ib_post_receives(struct net_device *dev)
 152 {
 153         struct ipoib_dev_priv *priv = netdev_priv(dev);
 154         int i;
 155
 156         for (i = 0; i < ipoib_recvq_size; ++i) {
 157                 if (ipoib_alloc_rx_skb(dev, i)) {
 158                         ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
 159                         return -ENOMEM;
 160                 }
 161                 if (ipoib_ib_post_receive(dev, i)) {
 162                         ipoib_warn(priv, "ipoib_ib_post_receive failed for buf %d\n", i);
 163                         return -EIO;
 164                 }
 165         }
 166
 167         return 0;
 168 }
 169
 170 static void ipoib_ib_handle_rx_wc(struct net_device *dev, struct ib_wc *wc)
 171 {
 172         struct ipoib_dev_priv *priv = netdev_priv(dev);
 173         unsigned int wr_id = wc->wr_id & ~IPOIB_OP_RECV;
 174         struct sk_buff *skb;
 175         u64 addr;
 176
 177         ipoib_dbg_data(priv, "recv completion: id %d, status: %d\n",
 178                        wr_id, wc->status);
 179
 180         if (unlikely(wr_id >= ipoib_recvq_size)) {
 181                 ipoib_warn(priv, "recv completion event with wrid %d (> %d)\n",
 182                            wr_id, ipoib_recvq_size);
 183                 return;
 184         }
 185
 186         skb  = priv->rx_ring[wr_id].skb;
 187         addr = priv->rx_ring[wr_id].mapping;
 188
 189         if (unlikely(wc->status != IB_WC_SUCCESS)) {
 190                 if (wc->status != IB_WC_WR_FLUSH_ERR)
 191                         ipoib_warn(priv, "failed recv event "
 192                                    "(status=%d, wrid=%d vend_err %x)\n",
 193                                    wc->status, wr_id, wc->vendor_err);
 194                 ib_dma_unmap_single(priv->ca, addr,
 195                                     IPOIB_BUF_SIZE, DMA_FROM_DEVICE);
 196                 dev_kfree_skb_any(skb);
 197                 priv->rx_ring[wr_id].skb = NULL;
 198                 return;
 199         }
 200
 201         /*
 202          * Drop packets that this interface sent, ie multicast packets
 203          * that the HCA has replicated.
 204          */
 205         if (wc->slid == priv->local_lid && wc->src_qp == priv->qp->qp_num)
 206                 goto repost;
 207
 208         /*
 209          * If we can't allocate a new RX buffer, dump
 210          * this packet and reuse the old buffer.
 211          */
 212         if (unlikely(ipoib_alloc_rx_skb(dev, wr_id))) {
 213                 ++dev->stats.rx_dropped;
 214                 goto repost;
 215         }
 216
 217         ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
 218                        wc->byte_len, wc->slid);
 219
 220         ib_dma_unmap_single(priv->ca, addr, IPOIB_BUF_SIZE, DMA_FROM_DEVICE);
 221
 222         skb_put(skb, wc->byte_len);
 223         skb_pull(skb, IB_GRH_BYTES);
 224
 225         skb->protocol = ((struct ipoib_header *) skb->data)->proto;
 226         skb_reset_mac_header(skb);
 227         skb_pull(skb, IPOIB_ENCAP_LEN);
 228
 229         dev->last_rx = jiffies;
 230         ++dev->stats.rx_packets;
 231         dev->stats.rx_bytes += skb->len;
 232
 233         skb->dev = dev;
 234         /* XXX get correct PACKET_ type here */
 235         skb->pkt_type = PACKET_HOST;
 236
 237         if (test_bit(IPOIB_FLAG_CSUM, &priv->flags) && likely(wc->csum_ok))
 238                 skb->ip_summed = CHECKSUM_UNNECESSARY;
 239
 240         netif_receive_skb(skb);
 241
 242 repost:
 243         if (unlikely(ipoib_ib_post_receive(dev, wr_id)))
 244                 ipoib_warn(priv, "ipoib_ib_post_receive failed "
 245                            "for buf %d\n", wr_id);
 246 }
 247
 248 static int ipoib_dma_map_tx(struct ib_device *ca,
 249                             struct ipoib_tx_buf *tx_req)
 250 {
 251         struct sk_buff *skb = tx_req->skb;
 252         u64 *mapping = tx_req->mapping;
 253         int i;
 254         int off;
 255
 256         if (skb_headlen(skb)) {
 257                 mapping[0] = ib_dma_map_single(ca, skb->data, skb_headlen(skb),
 258                                                DMA_TO_DEVICE);
 259                 if (unlikely(ib_dma_mapping_error(ca, mapping[0])))
 260                         return -EIO;
 261
 262                 off = 1;
 263         } else
 264                 off = 0;
 265
 266         for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) {
 267                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 268                 mapping[i + off] = ib_dma_map_page(ca, frag->page,
 269                                                  frag->page_offset, frag->size,
 270                                                  DMA_TO_DEVICE);
 271                 if (unlikely(ib_dma_mapping_error(ca, mapping[i + off])))
 272                         goto partial_error;
 273         }
 274         return 0;
 275
 276 partial_error:
 277         for (; i > 0; --i) {
 278                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i - 1];
 279                 ib_dma_unmap_page(ca, mapping[i - !off], frag->size, DMA_TO_DEVICE);
 280         }
 281
 282         if (off)
 283                 ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE);
 284
 285         return -EIO;
 286 }
 287
 288 static void ipoib_dma_unmap_tx(struct ib_device *ca,
 289                                struct ipoib_tx_buf *tx_req)
 290 {
 291         struct sk_buff *skb = tx_req->skb;
 292         u64 *mapping = tx_req->mapping;
 293         int i;
 294         int off;
 295
 296         if (skb_headlen(skb)) {
 297                 ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE);
 298                 off = 1;
 299         } else
 300                 off = 0;
 301
 302         for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) {
 303                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 304                 ib_dma_unmap_page(ca, mapping[i + off], frag->size,
 305                                   DMA_TO_DEVICE);
 306         }
 307 }
 308
 309 static void ipoib_ib_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
 310 {
 311         struct ipoib_dev_priv *priv = netdev_priv(dev);
 312         unsigned int wr_id = wc->wr_id;
 313         struct ipoib_tx_buf *tx_req;
 314         unsigned long flags;
 315
 316         ipoib_dbg_data(priv, "send completion: id %d, status: %d\n",
 317                        wr_id, wc->status);
 318
 319         if (unlikely(wr_id >= ipoib_sendq_size)) {
 320                 ipoib_warn(priv, "send completion event with wrid %d (> %d)\n",
 321                            wr_id, ipoib_sendq_size);
 322                 return;
 323         }
 324
 325         tx_req = &priv->tx_ring[wr_id];
 326
 327         ipoib_dma_unmap_tx(priv->ca, tx_req);
 328
 329         ++dev->stats.tx_packets;
 330         dev->stats.tx_bytes += tx_req->skb->len;
 331
 332         dev_kfree_skb_any(tx_req->skb);
 333
 334         spin_lock_irqsave(&priv->tx_lock, flags);
 335         ++priv->tx_tail;
 336         if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
 337             netif_queue_stopped(dev) &&
 338             test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
 339                 netif_wake_queue(dev);
 340         spin_unlock_irqrestore(&priv->tx_lock, flags);
 341
 342         if (wc->status != IB_WC_SUCCESS &&
 343             wc->status != IB_WC_WR_FLUSH_ERR)
 344                 ipoib_warn(priv, "failed send event "
 345                            "(status=%d, wrid=%d vend_err %x)\n",
 346                            wc->status, wr_id, wc->vendor_err);
 347 }
 348
 349 int ipoib_poll(struct napi_struct *napi, int budget)
 350 {
 351         struct ipoib_dev_priv *priv = container_of(napi, struct ipoib_dev_priv, napi);
 352         struct net_device *dev = priv->dev;
 353         int done;
 354         int t;
 355         int n, i;
 356
 357         done  = 0;
 358
 359 poll_more:
 360         while (done < budget) {
 361                 int max = (budget - done);
 362
 363                 t = min(IPOIB_NUM_WC, max);
 364                 n = ib_poll_cq(priv->cq, t, priv->ibwc);
 365
 366                 for (i = 0; i < n; i++) {
 367                         struct ib_wc *wc = priv->ibwc + i;
 368
 369                         if (wc->wr_id & IPOIB_OP_RECV) {
 370                                 ++done;
 371                                 if (wc->wr_id & IPOIB_OP_CM)
 372                                         ipoib_cm_handle_rx_wc(dev, wc);
 373                                 else
 374                                         ipoib_ib_handle_rx_wc(dev, wc);
 375                         } else {
 376                                 if (wc->wr_id & IPOIB_OP_CM)
 377                                         ipoib_cm_handle_tx_wc(dev, wc);
 378                                 else
 379                                         ipoib_ib_handle_tx_wc(dev, wc);
 380                         }
 381                 }
 382
 383                 if (n != t)
 384                         break;
 385         }
 386
 387         if (done < budget) {
 388                 netif_rx_complete(dev, napi);
 389                 if (unlikely(ib_req_notify_cq(priv->cq,
 390                                               IB_CQ_NEXT_COMP |
 391                                               IB_CQ_REPORT_MISSED_EVENTS)) &&
 392                     netif_rx_reschedule(dev, napi))
 393                         goto poll_more;
 394         }
 395
 396         return done;
 397 }
 398
 399 void ipoib_ib_completion(struct ib_cq *cq, void *dev_ptr)
 400 {
 401         struct net_device *dev = dev_ptr;
 402         struct ipoib_dev_priv *priv = netdev_priv(dev);
 403
 404         netif_rx_schedule(dev, &priv->napi);
 405 }
 406
 407 static inline int post_send(struct ipoib_dev_priv *priv,
 408                             unsigned int wr_id,
 409                             struct ib_ah *address, u32 qpn,
 410                             struct ipoib_tx_buf *tx_req,
 411                             void *head, int hlen)
 412 {
 413         struct ib_send_wr *bad_wr;
 414         int i, off;
 415         struct sk_buff *skb = tx_req->skb;
 416         skb_frag_t *frags = skb_shinfo(skb)->frags;
 417         int nr_frags = skb_shinfo(skb)->nr_frags;
 418         u64 *mapping = tx_req->mapping;
 419
 420         if (skb_headlen(skb)) {
 421                 priv->tx_sge[0].addr         = mapping[0];
 422                 priv->tx_sge[0].length       = skb_headlen(skb);
 423                 off = 1;
 424         } else
 425                 off = 0;
 426
 427         for (i = 0; i < nr_frags; ++i) {
 428                 priv->tx_sge[i + off].addr = mapping[i + off];
 429                 priv->tx_sge[i + off].length = frags[i].size;
 430         }
 431         priv->tx_wr.num_sge          = nr_frags + off;
 432         priv->tx_wr.wr_id            = wr_id;
 433         priv->tx_wr.wr.ud.remote_qpn = qpn;
 434         priv->tx_wr.wr.ud.ah         = address;
 435
 436         if (head) {
 437                 priv->tx_wr.wr.ud.mss    = skb_shinfo(skb)->gso_size;
 438                 priv->tx_wr.wr.ud.header = head;
 439                 priv->tx_wr.wr.ud.hlen   = hlen;
 440                 priv->tx_wr.opcode       = IB_WR_LSO;
 441         } else
 442                 priv->tx_wr.opcode       = IB_WR_SEND;
 443
 444         return ib_post_send(priv->qp, &priv->tx_wr, &bad_wr);
 445 }
 446
 447 void ipoib_send(struct net_device *dev, struct sk_buff *skb,
 448                 struct ipoib_ah *address, u32 qpn)
 449 {
 450         struct ipoib_dev_priv *priv = netdev_priv(dev);
 451         struct ipoib_tx_buf *tx_req;
 452         int hlen;
 453         void *phead;
 454
 455         if (skb_is_gso(skb)) {
 456                 hlen = skb_transport_offset(skb) + tcp_hdrlen(skb);
 457                 phead = skb->data;
 458                 if (unlikely(!skb_pull(skb, hlen))) {
 459                         ipoib_warn(priv, "linear data too small\n");
 460                         ++dev->stats.tx_dropped;
 461                         ++dev->stats.tx_errors;
 462                         dev_kfree_skb_any(skb);
 463                         return;
 464                 }
 465         } else {
 466                 if (unlikely(skb->len > priv->mcast_mtu + IPOIB_ENCAP_LEN)) {
 467                         ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
 468                                    skb->len, priv->mcast_mtu + IPOIB_ENCAP_LEN);
 469                         ++dev->stats.tx_dropped;
 470                         ++dev->stats.tx_errors;
 471                         ipoib_cm_skb_too_long(dev, skb, priv->mcast_mtu);
 472                         return;
 473                 }
 474                 phead = NULL;
 475                 hlen  = 0;
 476         }
 477
 478         ipoib_dbg_data(priv, "sending packet, length=%d address=%p qpn=0x%06x\n",
 479                        skb->len, address, qpn);
 480
 481         /*
 482          * We put the skb into the tx_ring _before_ we call post_send()
 483          * because it's entirely possible that the completion handler will
 484          * run before we execute anything after the post_send().  That
 485          * means we have to make sure everything is properly recorded and
 486          * our state is consistent before we call post_send().
 487          */
 488         tx_req = &priv->tx_ring[priv->tx_head & (ipoib_sendq_size - 1)];
 489         tx_req->skb = skb;
 490         if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req))) {
 491                 ++dev->stats.tx_errors;
 492                 dev_kfree_skb_any(skb);
 493                 return;
 494         }
 495
 496         if (skb->ip_summed == CHECKSUM_PARTIAL)
 497                 priv->tx_wr.send_flags |= IB_SEND_IP_CSUM;
 498         else
 499                 priv->tx_wr.send_flags &= ~IB_SEND_IP_CSUM;
 500
 501         if (unlikely(post_send(priv, priv->tx_head & (ipoib_sendq_size - 1),
 502                                address->ah, qpn, tx_req, phead, hlen))) {
 503                 ipoib_warn(priv, "post_send failed\n");
 504                 ++dev->stats.tx_errors;
 505                 ipoib_dma_unmap_tx(priv->ca, tx_req);
 506                 dev_kfree_skb_any(skb);
 507         } else {
 508                 dev->trans_start = jiffies;
 509
 510                 address->last_send = priv->tx_head;
 511                 ++priv->tx_head;
 512
 513                 if (++priv->tx_outstanding == ipoib_sendq_size) {
 514                         ipoib_dbg(priv, "TX ring full, stopping kernel net queue\n");
 515                         netif_stop_queue(dev);
 516                 }
 517         }
 518 }
 519
 520 static void __ipoib_reap_ah(struct net_device *dev)
 521 {
 522         struct ipoib_dev_priv *priv = netdev_priv(dev);
 523         struct ipoib_ah *ah, *tah;
 524         LIST_HEAD(remove_list);
 525
 526         spin_lock_irq(&priv->tx_lock);
 527         spin_lock(&priv->lock);
 528         list_for_each_entry_safe(ah, tah, &priv->dead_ahs, list)
 529                 if ((int) priv->tx_tail - (int) ah->last_send >= 0) {
 530                         list_del(&ah->list);
 531                         ib_destroy_ah(ah->ah);
 532                         kfree(ah);
 533                 }
 534         spin_unlock(&priv->lock);
 535         spin_unlock_irq(&priv->tx_lock);
 536 }
 537
 538 void ipoib_reap_ah(struct work_struct *work)
 539 {
 540         struct ipoib_dev_priv *priv =
 541                 container_of(work, struct ipoib_dev_priv, ah_reap_task.work);
 542         struct net_device *dev = priv->dev;
 543
 544         __ipoib_reap_ah(dev);
 545
 546         if (!test_bit(IPOIB_STOP_REAPER, &priv->flags))
 547                 queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task,
 548                                    round_jiffies_relative(HZ));
 549 }
 550
 551 int ipoib_ib_dev_open(struct net_device *dev)
 552 {
 553         struct ipoib_dev_priv *priv = netdev_priv(dev);
 554         int ret;
 555
 556         if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &priv->pkey_index)) {
 557                 ipoib_warn(priv, "P_Key 0x%04x not found\n", priv->pkey);
 558                 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 559                 return -1;
 560         }
 561         set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 562
 563         ret = ipoib_init_qp(dev);
 564         if (ret) {
 565                 ipoib_warn(priv, "ipoib_init_qp returned %d\n", ret);
 566                 return -1;
 567         }
 568
 569         ret = ipoib_ib_post_receives(dev);
 570         if (ret) {
 571                 ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret);
 572                 ipoib_ib_dev_stop(dev, 1);
 573                 return -1;
 574         }
 575
 576         ret = ipoib_cm_dev_open(dev);
 577         if (ret) {
 578                 ipoib_warn(priv, "ipoib_cm_dev_open returned %d\n", ret);
 579                 ipoib_ib_dev_stop(dev, 1);
 580                 return -1;
 581         }
 582
 583         clear_bit(IPOIB_STOP_REAPER, &priv->flags);
 584         queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task,
 585                            round_jiffies_relative(HZ));
 586
 587         set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
 588
 589         return 0;
 590 }
 591
 592 static void ipoib_pkey_dev_check_presence(struct net_device *dev)
 593 {
 594         struct ipoib_dev_priv *priv = netdev_priv(dev);
 595         u16 pkey_index = 0;
 596
 597         if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &pkey_index))
 598                 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 599         else
 600                 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 601 }
 602
 603 int ipoib_ib_dev_up(struct net_device *dev)
 604 {
 605         struct ipoib_dev_priv *priv = netdev_priv(dev);
 606
 607         ipoib_pkey_dev_check_presence(dev);
 608
 609         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
 610                 ipoib_dbg(priv, "PKEY is not assigned.\n");
 611                 return 0;
 612         }
 613
 614         set_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
 615
 616         return ipoib_mcast_start_thread(dev);
 617 }
 618
 619 int ipoib_ib_dev_down(struct net_device *dev, int flush)
 620 {
 621         struct ipoib_dev_priv *priv = netdev_priv(dev);
 622
 623         ipoib_dbg(priv, "downing ib_dev\n");
 624
 625         clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
 626         netif_carrier_off(dev);
 627
 628         /* Shutdown the P_Key thread if still active */
 629         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
 630                 mutex_lock(&pkey_mutex);
 631                 set_bit(IPOIB_PKEY_STOP, &priv->flags);
 632                 cancel_delayed_work(&priv->pkey_poll_task);
 633                 mutex_unlock(&pkey_mutex);
 634                 if (flush)
 635                         flush_workqueue(ipoib_workqueue);
 636         }
 637
 638         ipoib_mcast_stop_thread(dev, flush);
 639         ipoib_mcast_dev_flush(dev);
 640
 641         ipoib_flush_paths(dev);
 642
 643         return 0;
 644 }
 645
 646 static int recvs_pending(struct net_device *dev)
 647 {
 648         struct ipoib_dev_priv *priv = netdev_priv(dev);
 649         int pending = 0;
 650         int i;
 651
 652         for (i = 0; i < ipoib_recvq_size; ++i)
 653                 if (priv->rx_ring[i].skb)
 654                         ++pending;
 655
 656         return pending;
 657 }
 658
 659 void ipoib_drain_cq(struct net_device *dev)
 660 {
 661         struct ipoib_dev_priv *priv = netdev_priv(dev);
 662         int i, n;
 663         do {
 664                 n = ib_poll_cq(priv->cq, IPOIB_NUM_WC, priv->ibwc);
 665                 for (i = 0; i < n; ++i) {
 666                         /*
 667                          * Convert any successful completions to flush
 668                          * errors to avoid passing packets up the
 669                          * stack after bringing the device down.
 670                          */
 671                         if (priv->ibwc[i].status == IB_WC_SUCCESS)
 672                                 priv->ibwc[i].status = IB_WC_WR_FLUSH_ERR;
 673
 674                         if (priv->ibwc[i].wr_id & IPOIB_OP_RECV) {
 675                                 if (priv->ibwc[i].wr_id & IPOIB_OP_CM)
 676                                         ipoib_cm_handle_rx_wc(dev, priv->ibwc + i);
 677                                 else
 678                                         ipoib_ib_handle_rx_wc(dev, priv->ibwc + i);
 679                         } else {
 680                                 if (priv->ibwc[i].wr_id & IPOIB_OP_CM)
 681                                         ipoib_cm_handle_tx_wc(dev, priv->ibwc + i);
 682                                 else
 683                                         ipoib_ib_handle_tx_wc(dev, priv->ibwc + i);
 684                         }
 685                 }
 686         } while (n == IPOIB_NUM_WC);
 687 }
 688
 689 int ipoib_ib_dev_stop(struct net_device *dev, int flush)
 690 {
 691         struct ipoib_dev_priv *priv = netdev_priv(dev);
 692         struct ib_qp_attr qp_attr;
 693         unsigned long begin;
 694         struct ipoib_tx_buf *tx_req;
 695         int i;
 696
 697         clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
 698
 699         ipoib_cm_dev_stop(dev);
 700
 701         /*
 702          * Move our QP to the error state and then reinitialize in
 703          * when all work requests have completed or have been flushed.
 704          */
 705         qp_attr.qp_state = IB_QPS_ERR;
 706         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
 707                 ipoib_warn(priv, "Failed to modify QP to ERROR state\n");
 708
 709         /* Wait for all sends and receives to complete */
 710         begin = jiffies;
 711
 712         while (priv->tx_head != priv->tx_tail || recvs_pending(dev)) {
 713                 if (time_after(jiffies, begin + 5 * HZ)) {
 714                         ipoib_warn(priv, "timing out; %d sends %d receives not completed\n",
 715                                    priv->tx_head - priv->tx_tail, recvs_pending(dev));
 716
 717                         /*
 718                          * assume the HW is wedged and just free up
 719                          * all our pending work requests.
 720                          */
 721                         while ((int) priv->tx_tail - (int) priv->tx_head < 0) {
 722                                 tx_req = &priv->tx_ring[priv->tx_tail &
 723                                                         (ipoib_sendq_size - 1)];
 724                                 ipoib_dma_unmap_tx(priv->ca, tx_req);
 725                                 dev_kfree_skb_any(tx_req->skb);
 726                                 ++priv->tx_tail;
 727                                 --priv->tx_outstanding;
 728                         }
 729
 730                         for (i = 0; i < ipoib_recvq_size; ++i) {
 731                                 struct ipoib_rx_buf *rx_req;
 732
 733                                 rx_req = &priv->rx_ring[i];
 734                                 if (!rx_req->skb)
 735                                         continue;
 736                                 ib_dma_unmap_single(priv->ca,
 737                                                     rx_req->mapping,
 738                                                     IPOIB_BUF_SIZE,
 739                                                     DMA_FROM_DEVICE);
 740                                 dev_kfree_skb_any(rx_req->skb);
 741                                 rx_req->skb = NULL;
 742                         }
 743
 744                         goto timeout;
 745                 }
 746
 747                 ipoib_drain_cq(dev);
 748
 749                 msleep(1);
 750         }
 751
 752         ipoib_dbg(priv, "All sends and receives done.\n");
 753
 754 timeout:
 755         qp_attr.qp_state = IB_QPS_RESET;
 756         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
 757                 ipoib_warn(priv, "Failed to modify QP to RESET state\n");
 758
 759         /* Wait for all AHs to be reaped */
 760         set_bit(IPOIB_STOP_REAPER, &priv->flags);
 761         cancel_delayed_work(&priv->ah_reap_task);
 762         if (flush)
 763                 flush_workqueue(ipoib_workqueue);
 764
 765         begin = jiffies;
 766
 767         while (!list_empty(&priv->dead_ahs)) {
 768                 __ipoib_reap_ah(dev);
 769
 770                 if (time_after(jiffies, begin + HZ)) {
 771                         ipoib_warn(priv, "timing out; will leak address handles\n");
 772                         break;
 773                 }
 774
 775                 msleep(1);
 776         }
 777
 778         ib_req_notify_cq(priv->cq, IB_CQ_NEXT_COMP);
 779
 780         return 0;
 781 }
 782
 783 int ipoib_ib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
 784 {
 785         struct ipoib_dev_priv *priv = netdev_priv(dev);
 786
 787         priv->ca = ca;
 788         priv->port = port;
 789         priv->qp = NULL;
 790
 791         if (ipoib_transport_dev_init(dev, ca)) {
 792                 printk(KERN_WARNING "%s: ipoib_transport_dev_init failed\n", ca->name);
 793                 return -ENODEV;
 794         }
 795
 796         if (dev->flags & IFF_UP) {
 797                 if (ipoib_ib_dev_open(dev)) {
 798                         ipoib_transport_dev_cleanup(dev);
 799                         return -ENODEV;
 800                 }
 801         }
 802
 803         return 0;
 804 }
 805
 806 static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv, int pkey_event)
 807 {
 808         struct ipoib_dev_priv *cpriv;
 809         struct net_device *dev = priv->dev;
 810         u16 new_index;
 811
 812         mutex_lock(&priv->vlan_mutex);
 813
 814         /*
 815          * Flush any child interfaces too -- they might be up even if
 816          * the parent is down.
 817          */
 818         list_for_each_entry(cpriv, &priv->child_intfs, list)
 819                 __ipoib_ib_dev_flush(cpriv, pkey_event);
 820
 821         mutex_unlock(&priv->vlan_mutex);
 822
 823         if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) {
 824                 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n");
 825                 return;
 826         }
 827
 828         if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
 829                 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n");
 830                 return;
 831         }
 832
 833         if (pkey_event) {
 834                 if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &new_index)) {
 835                         clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 836                         ipoib_ib_dev_down(dev, 0);
 837                         ipoib_ib_dev_stop(dev, 0);
 838                         if (ipoib_pkey_dev_delay_open(dev))
 839                                 return;
 840                 }
 841
 842                 /* restart QP only if P_Key index is changed */
 843                 if (test_and_set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags) &&
 844                     new_index == priv->pkey_index) {
 845                         ipoib_dbg(priv, "Not flushing - P_Key index not changed.\n");
 846                         return;
 847                 }
 848                 priv->pkey_index = new_index;
 849         }
 850
 851         ipoib_dbg(priv, "flushing\n");
 852
 853         ipoib_ib_dev_down(dev, 0);
 854
 855         if (pkey_event) {
 856                 ipoib_ib_dev_stop(dev, 0);
 857                 ipoib_ib_dev_open(dev);
 858         }
 859
 860         /*
 861          * The device could have been brought down between the start and when
 862          * we get here, don't bring it back up if it's not configured up
 863          */
 864         if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
 865                 ipoib_ib_dev_up(dev);
 866                 ipoib_mcast_restart_task(&priv->restart_task);
 867         }
 868 }
 869
 870 void ipoib_ib_dev_flush(struct work_struct *work)
 871 {
 872         struct ipoib_dev_priv *priv =
 873                 container_of(work, struct ipoib_dev_priv, flush_task);
 874
 875         ipoib_dbg(priv, "Flushing %s\n", priv->dev->name);
 876         __ipoib_ib_dev_flush(priv, 0);
 877 }
 878
 879 void ipoib_pkey_event(struct work_struct *work)
 880 {
 881         struct ipoib_dev_priv *priv =
 882                 container_of(work, struct ipoib_dev_priv, pkey_event_task);
 883
 884         ipoib_dbg(priv, "Flushing %s and restarting its QP\n", priv->dev->name);
 885         __ipoib_ib_dev_flush(priv, 1);
 886 }
 887
 888 void ipoib_ib_dev_cleanup(struct net_device *dev)
 889 {
 890         struct ipoib_dev_priv *priv = netdev_priv(dev);
 891
 892         ipoib_dbg(priv, "cleaning up ib_dev\n");
 893
 894         ipoib_mcast_stop_thread(dev, 1);
 895         ipoib_mcast_dev_flush(dev);
 896
 897         ipoib_transport_dev_cleanup(dev);
 898 }
 899
 900 /*
 901  * Delayed P_Key Assigment Interim Support
 902  *
 903  * The following is initial implementation of delayed P_Key assigment
 904  * mechanism. It is using the same approach implemented for the multicast
 905  * group join. The single goal of this implementation is to quickly address
 906  * Bug #2507. This implementation will probably be removed when the P_Key
 907  * change async notification is available.
 908  */
 909
 910 void ipoib_pkey_poll(struct work_struct *work)
 911 {
 912         struct ipoib_dev_priv *priv =
 913                 container_of(work, struct ipoib_dev_priv, pkey_poll_task.work);
 914         struct net_device *dev = priv->dev;
 915
 916         ipoib_pkey_dev_check_presence(dev);
 917
 918         if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags))
 919                 ipoib_open(dev);
 920         else {
 921                 mutex_lock(&pkey_mutex);
 922                 if (!test_bit(IPOIB_PKEY_STOP, &priv->flags))
 923                         queue_delayed_work(ipoib_workqueue,
 924                                            &priv->pkey_poll_task,
 925                                            HZ);
 926                 mutex_unlock(&pkey_mutex);
 927         }
 928 }
 929
 930 int ipoib_pkey_dev_delay_open(struct net_device *dev)
 931 {
 932         struct ipoib_dev_priv *priv = netdev_priv(dev);
 933
 934         /* Look for the interface pkey value in the IB Port P_Key table and */
 935         /* set the interface pkey assigment flag                            */
 936         ipoib_pkey_dev_check_presence(dev);
 937
 938         /* P_Key value not assigned yet - start polling */
 939         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
 940                 mutex_lock(&pkey_mutex);
 941                 clear_bit(IPOIB_PKEY_STOP, &priv->flags);
 942                 queue_delayed_work(ipoib_workqueue,
 943                                    &priv->pkey_poll_task,
 944                                    HZ);
 945                 mutex_unlock(&pkey_mutex);
 946                 return 1;
 947         }
 948
 949         return 0;
 950 }