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
  36 #include <linux/delay.h>
  37 #include <linux/dma-mapping.h>
  38 #include <linux/slab.h>
  39
  40 #include <linux/ip.h>
  41 #include <linux/tcp.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 void ipoib_ud_dma_unmap_rx(struct ipoib_dev_priv *priv,
  91                                   u64 mapping[IPOIB_UD_RX_SG])
  92 {
  93         if (ipoib_ud_need_sg(priv->max_ib_mtu)) {
  94                 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_UD_HEAD_SIZE,
  95                                     DMA_FROM_DEVICE);
  96                 ib_dma_unmap_page(priv->ca, mapping[1], PAGE_SIZE,
  97                                   DMA_FROM_DEVICE);
  98         } else
  99                 ib_dma_unmap_single(priv->ca, mapping[0],
 100                                     IPOIB_UD_BUF_SIZE(priv->max_ib_mtu),
 101                                     DMA_FROM_DEVICE);
 102 }
 103
 104 static void ipoib_ud_skb_put_frags(struct ipoib_dev_priv *priv,
 105                                    struct sk_buff *skb,
 106                                    unsigned int length)
 107 {
 108         if (ipoib_ud_need_sg(priv->max_ib_mtu)) {
 109                 skb_frag_t *frag = &skb_shinfo(skb)->frags[0];
 110                 unsigned int size;
 111                 /*
 112                  * There is only two buffers needed for max_payload = 4K,
 113                  * first buf size is IPOIB_UD_HEAD_SIZE
 114                  */
 115                 skb->tail += IPOIB_UD_HEAD_SIZE;
 116                 skb->len  += length;
 117
 118                 size = length - IPOIB_UD_HEAD_SIZE;
 119
 120                 frag->size     = size;
 121                 skb->data_len += size;
 122                 skb->truesize += size;
 123         } else
 124                 skb_put(skb, length);
 125
 126 }
 127
 128 static int ipoib_ib_post_receive(struct net_device *dev, int id)
 129 {
 130         struct ipoib_dev_priv *priv = netdev_priv(dev);
 131         struct ib_recv_wr *bad_wr;
 132         int ret;
 133
 134         priv->rx_wr.wr_id   = id | IPOIB_OP_RECV;
 135         priv->rx_sge[0].addr = priv->rx_ring[id].mapping[0];
 136         priv->rx_sge[1].addr = priv->rx_ring[id].mapping[1];
 137
 138
 139         ret = ib_post_recv(priv->qp, &priv->rx_wr, &bad_wr);
 140         if (unlikely(ret)) {
 141                 ipoib_warn(priv, "receive failed for buf %d (%d)\n", id, ret);
 142                 ipoib_ud_dma_unmap_rx(priv, priv->rx_ring[id].mapping);
 143                 dev_kfree_skb_any(priv->rx_ring[id].skb);
 144                 priv->rx_ring[id].skb = NULL;
 145         }
 146
 147         return ret;
 148 }
 149
 150 static struct sk_buff *ipoib_alloc_rx_skb(struct net_device *dev, int id)
 151 {
 152         struct ipoib_dev_priv *priv = netdev_priv(dev);
 153         struct sk_buff *skb;
 154         int buf_size;
 155         u64 *mapping;
 156
 157         if (ipoib_ud_need_sg(priv->max_ib_mtu))
 158                 buf_size = IPOIB_UD_HEAD_SIZE;
 159         else
 160                 buf_size = IPOIB_UD_BUF_SIZE(priv->max_ib_mtu);
 161
 162         skb = dev_alloc_skb(buf_size + 4);
 163         if (unlikely(!skb))
 164                 return NULL;
 165
 166         /*
 167          * IB will leave a 40 byte gap for a GRH and IPoIB adds a 4 byte
 168          * header.  So we need 4 more bytes to get to 48 and align the
 169          * IP header to a multiple of 16.
 170          */
 171         skb_reserve(skb, 4);
 172
 173         mapping = priv->rx_ring[id].mapping;
 174         mapping[0] = ib_dma_map_single(priv->ca, skb->data, buf_size,
 175                                        DMA_FROM_DEVICE);
 176         if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0])))
 177                 goto error;
 178
 179         if (ipoib_ud_need_sg(priv->max_ib_mtu)) {
 180                 struct page *page = alloc_page(GFP_ATOMIC);
 181                 if (!page)
 182                         goto partial_error;
 183                 skb_fill_page_desc(skb, 0, page, 0, PAGE_SIZE);
 184                 mapping[1] =
 185                         ib_dma_map_page(priv->ca, skb_shinfo(skb)->frags[0].page,
 186                                         0, PAGE_SIZE, DMA_FROM_DEVICE);
 187                 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[1])))
 188                         goto partial_error;
 189         }
 190
 191         priv->rx_ring[id].skb = skb;
 192         return skb;
 193
 194 partial_error:
 195         ib_dma_unmap_single(priv->ca, mapping[0], buf_size, DMA_FROM_DEVICE);
 196 error:
 197         dev_kfree_skb_any(skb);
 198         return NULL;
 199 }
 200
 201 static int ipoib_ib_post_receives(struct net_device *dev)
 202 {
 203         struct ipoib_dev_priv *priv = netdev_priv(dev);
 204         int i;
 205
 206         for (i = 0; i < ipoib_recvq_size; ++i) {
 207                 if (!ipoib_alloc_rx_skb(dev, i)) {
 208                         ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
 209                         return -ENOMEM;
 210                 }
 211                 if (ipoib_ib_post_receive(dev, i)) {
 212                         ipoib_warn(priv, "ipoib_ib_post_receive failed for buf %d\n", i);
 213                         return -EIO;
 214                 }
 215         }
 216
 217         return 0;
 218 }
 219
 220 static void ipoib_ib_handle_rx_wc(struct net_device *dev, struct ib_wc *wc)
 221 {
 222         struct ipoib_dev_priv *priv = netdev_priv(dev);
 223         unsigned int wr_id = wc->wr_id & ~IPOIB_OP_RECV;
 224         struct sk_buff *skb;
 225         u64 mapping[IPOIB_UD_RX_SG];
 226         union ib_gid *dgid;
 227
 228         ipoib_dbg_data(priv, "recv completion: id %d, status: %d\n",
 229                        wr_id, wc->status);
 230
 231         if (unlikely(wr_id >= ipoib_recvq_size)) {
 232                 ipoib_warn(priv, "recv completion event with wrid %d (> %d)\n",
 233                            wr_id, ipoib_recvq_size);
 234                 return;
 235         }
 236
 237         skb  = priv->rx_ring[wr_id].skb;
 238
 239         if (unlikely(wc->status != IB_WC_SUCCESS)) {
 240                 if (wc->status != IB_WC_WR_FLUSH_ERR)
 241                         ipoib_warn(priv, "failed recv event "
 242                                    "(status=%d, wrid=%d vend_err %x)\n",
 243                                    wc->status, wr_id, wc->vendor_err);
 244                 ipoib_ud_dma_unmap_rx(priv, priv->rx_ring[wr_id].mapping);
 245                 dev_kfree_skb_any(skb);
 246                 priv->rx_ring[wr_id].skb = NULL;
 247                 return;
 248         }
 249
 250         /*
 251          * Drop packets that this interface sent, ie multicast packets
 252          * that the HCA has replicated.
 253          */
 254         if (wc->slid == priv->local_lid && wc->src_qp == priv->qp->qp_num)
 255                 goto repost;
 256
 257         memcpy(mapping, priv->rx_ring[wr_id].mapping,
 258                IPOIB_UD_RX_SG * sizeof *mapping);
 259
 260         /*
 261          * If we can't allocate a new RX buffer, dump
 262          * this packet and reuse the old buffer.
 263          */
 264         if (unlikely(!ipoib_alloc_rx_skb(dev, wr_id))) {
 265                 ++dev->stats.rx_dropped;
 266                 goto repost;
 267         }
 268
 269         ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
 270                        wc->byte_len, wc->slid);
 271
 272         ipoib_ud_dma_unmap_rx(priv, mapping);
 273         ipoib_ud_skb_put_frags(priv, skb, wc->byte_len);
 274
 275         /* First byte of dgid signals multicast when 0xff */
 276         dgid = &((struct ib_grh *)skb->data)->dgid;
 277
 278         if (!(wc->wc_flags & IB_WC_GRH) || dgid->raw[0] != 0xff)
 279                 skb->pkt_type = PACKET_HOST;
 280         else if (memcmp(dgid, dev->broadcast + 4, sizeof(union ib_gid)) == 0)
 281                 skb->pkt_type = PACKET_BROADCAST;
 282         else
 283                 skb->pkt_type = PACKET_MULTICAST;
 284
 285         skb_pull(skb, IB_GRH_BYTES);
 286
 287         skb->protocol = ((struct ipoib_header *) skb->data)->proto;
 288         skb_reset_mac_header(skb);
 289         skb_pull(skb, IPOIB_ENCAP_LEN);
 290
 291         ++dev->stats.rx_packets;
 292         dev->stats.rx_bytes += skb->len;
 293
 294         skb->dev = dev;
 295         if (test_bit(IPOIB_FLAG_CSUM, &priv->flags) && likely(wc->csum_ok))
 296                 skb->ip_summed = CHECKSUM_UNNECESSARY;
 297
 298         if (dev->features & NETIF_F_LRO)
 299                 lro_receive_skb(&priv->lro.lro_mgr, skb, NULL);
 300         else
 301                 netif_receive_skb(skb);
 302
 303 repost:
 304         if (unlikely(ipoib_ib_post_receive(dev, wr_id)))
 305                 ipoib_warn(priv, "ipoib_ib_post_receive failed "
 306                            "for buf %d\n", wr_id);
 307 }
 308
 309 static int ipoib_dma_map_tx(struct ib_device *ca,
 310                             struct ipoib_tx_buf *tx_req)
 311 {
 312         struct sk_buff *skb = tx_req->skb;
 313         u64 *mapping = tx_req->mapping;
 314         int i;
 315         int off;
 316
 317         if (skb_headlen(skb)) {
 318                 mapping[0] = ib_dma_map_single(ca, skb->data, skb_headlen(skb),
 319                                                DMA_TO_DEVICE);
 320                 if (unlikely(ib_dma_mapping_error(ca, mapping[0])))
 321                         return -EIO;
 322
 323                 off = 1;
 324         } else
 325                 off = 0;
 326
 327         for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) {
 328                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 329                 mapping[i + off] = ib_dma_map_page(ca, frag->page,
 330                                                  frag->page_offset, frag->size,
 331                                                  DMA_TO_DEVICE);
 332                 if (unlikely(ib_dma_mapping_error(ca, mapping[i + off])))
 333                         goto partial_error;
 334         }
 335         return 0;
 336
 337 partial_error:
 338         for (; i > 0; --i) {
 339                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i - 1];
 340                 ib_dma_unmap_page(ca, mapping[i - !off], frag->size, DMA_TO_DEVICE);
 341         }
 342
 343         if (off)
 344                 ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE);
 345
 346         return -EIO;
 347 }
 348
 349 static void ipoib_dma_unmap_tx(struct ib_device *ca,
 350                                struct ipoib_tx_buf *tx_req)
 351 {
 352         struct sk_buff *skb = tx_req->skb;
 353         u64 *mapping = tx_req->mapping;
 354         int i;
 355         int off;
 356
 357         if (skb_headlen(skb)) {
 358                 ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE);
 359                 off = 1;
 360         } else
 361                 off = 0;
 362
 363         for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) {
 364                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 365                 ib_dma_unmap_page(ca, mapping[i + off], frag->size,
 366                                   DMA_TO_DEVICE);
 367         }
 368 }
 369
 370 static void ipoib_ib_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
 371 {
 372         struct ipoib_dev_priv *priv = netdev_priv(dev);
 373         unsigned int wr_id = wc->wr_id;
 374         struct ipoib_tx_buf *tx_req;
 375
 376         ipoib_dbg_data(priv, "send completion: id %d, status: %d\n",
 377                        wr_id, wc->status);
 378
 379         if (unlikely(wr_id >= ipoib_sendq_size)) {
 380                 ipoib_warn(priv, "send completion event with wrid %d (> %d)\n",
 381                            wr_id, ipoib_sendq_size);
 382                 return;
 383         }
 384
 385         tx_req = &priv->tx_ring[wr_id];
 386
 387         ipoib_dma_unmap_tx(priv->ca, tx_req);
 388
 389         ++dev->stats.tx_packets;
 390         dev->stats.tx_bytes += tx_req->skb->len;
 391
 392         dev_kfree_skb_any(tx_req->skb);
 393
 394         ++priv->tx_tail;
 395         if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
 396             netif_queue_stopped(dev) &&
 397             test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
 398                 netif_wake_queue(dev);
 399
 400         if (wc->status != IB_WC_SUCCESS &&
 401             wc->status != IB_WC_WR_FLUSH_ERR)
 402                 ipoib_warn(priv, "failed send event "
 403                            "(status=%d, wrid=%d vend_err %x)\n",
 404                            wc->status, wr_id, wc->vendor_err);
 405 }
 406
 407 static int poll_tx(struct ipoib_dev_priv *priv)
 408 {
 409         int n, i;
 410
 411         n = ib_poll_cq(priv->send_cq, MAX_SEND_CQE, priv->send_wc);
 412         for (i = 0; i < n; ++i)
 413                 ipoib_ib_handle_tx_wc(priv->dev, priv->send_wc + i);
 414
 415         return n == MAX_SEND_CQE;
 416 }
 417
 418 int ipoib_poll(struct napi_struct *napi, int budget)
 419 {
 420         struct ipoib_dev_priv *priv = container_of(napi, struct ipoib_dev_priv, napi);
 421         struct net_device *dev = priv->dev;
 422         int done;
 423         int t;
 424         int n, i;
 425
 426         done  = 0;
 427
 428 poll_more:
 429         while (done < budget) {
 430                 int max = (budget - done);
 431
 432                 t = min(IPOIB_NUM_WC, max);
 433                 n = ib_poll_cq(priv->recv_cq, t, priv->ibwc);
 434
 435                 for (i = 0; i < n; i++) {
 436                         struct ib_wc *wc = priv->ibwc + i;
 437
 438                         if (wc->wr_id & IPOIB_OP_RECV) {
 439                                 ++done;
 440                                 if (wc->wr_id & IPOIB_OP_CM)
 441                                         ipoib_cm_handle_rx_wc(dev, wc);
 442                                 else
 443                                         ipoib_ib_handle_rx_wc(dev, wc);
 444                         } else
 445                                 ipoib_cm_handle_tx_wc(priv->dev, wc);
 446                 }
 447
 448                 if (n != t)
 449                         break;
 450         }
 451
 452         if (done < budget) {
 453                 if (dev->features & NETIF_F_LRO)
 454                         lro_flush_all(&priv->lro.lro_mgr);
 455
 456                 napi_complete(napi);
 457                 if (unlikely(ib_req_notify_cq(priv->recv_cq,
 458                                               IB_CQ_NEXT_COMP |
 459                                               IB_CQ_REPORT_MISSED_EVENTS)) &&
 460                     napi_reschedule(napi))
 461                         goto poll_more;
 462         }
 463
 464         return done;
 465 }
 466
 467 void ipoib_ib_completion(struct ib_cq *cq, void *dev_ptr)
 468 {
 469         struct net_device *dev = dev_ptr;
 470         struct ipoib_dev_priv *priv = netdev_priv(dev);
 471
 472         napi_schedule(&priv->napi);
 473 }
 474
 475 static void drain_tx_cq(struct net_device *dev)
 476 {
 477         struct ipoib_dev_priv *priv = netdev_priv(dev);
 478
 479         netif_tx_lock(dev);
 480         while (poll_tx(priv))
 481                 ; /* nothing */
 482
 483         if (netif_queue_stopped(dev))
 484                 mod_timer(&priv->poll_timer, jiffies + 1);
 485
 486         netif_tx_unlock(dev);
 487 }
 488
 489 void ipoib_send_comp_handler(struct ib_cq *cq, void *dev_ptr)
 490 {
 491         struct ipoib_dev_priv *priv = netdev_priv(dev_ptr);
 492
 493         mod_timer(&priv->poll_timer, jiffies);
 494 }
 495
 496 static inline int post_send(struct ipoib_dev_priv *priv,
 497                             unsigned int wr_id,
 498                             struct ib_ah *address, u32 qpn,
 499                             struct ipoib_tx_buf *tx_req,
 500                             void *head, int hlen)
 501 {
 502         struct ib_send_wr *bad_wr;
 503         int i, off;
 504         struct sk_buff *skb = tx_req->skb;
 505         skb_frag_t *frags = skb_shinfo(skb)->frags;
 506         int nr_frags = skb_shinfo(skb)->nr_frags;
 507         u64 *mapping = tx_req->mapping;
 508
 509         if (skb_headlen(skb)) {
 510                 priv->tx_sge[0].addr         = mapping[0];
 511                 priv->tx_sge[0].length       = skb_headlen(skb);
 512                 off = 1;
 513         } else
 514                 off = 0;
 515
 516         for (i = 0; i < nr_frags; ++i) {
 517                 priv->tx_sge[i + off].addr = mapping[i + off];
 518                 priv->tx_sge[i + off].length = frags[i].size;
 519         }
 520         priv->tx_wr.num_sge          = nr_frags + off;
 521         priv->tx_wr.wr_id            = wr_id;
 522         priv->tx_wr.wr.ud.remote_qpn = qpn;
 523         priv->tx_wr.wr.ud.ah         = address;
 524
 525         if (head) {
 526                 priv->tx_wr.wr.ud.mss    = skb_shinfo(skb)->gso_size;
 527                 priv->tx_wr.wr.ud.header = head;
 528                 priv->tx_wr.wr.ud.hlen   = hlen;
 529                 priv->tx_wr.opcode       = IB_WR_LSO;
 530         } else
 531                 priv->tx_wr.opcode       = IB_WR_SEND;
 532
 533         return ib_post_send(priv->qp, &priv->tx_wr, &bad_wr);
 534 }
 535
 536 void ipoib_send(struct net_device *dev, struct sk_buff *skb,
 537                 struct ipoib_ah *address, u32 qpn)
 538 {
 539         struct ipoib_dev_priv *priv = netdev_priv(dev);
 540         struct ipoib_tx_buf *tx_req;
 541         int hlen, rc;
 542         void *phead;
 543
 544         if (skb_is_gso(skb)) {
 545                 hlen = skb_transport_offset(skb) + tcp_hdrlen(skb);
 546                 phead = skb->data;
 547                 if (unlikely(!skb_pull(skb, hlen))) {
 548                         ipoib_warn(priv, "linear data too small\n");
 549                         ++dev->stats.tx_dropped;
 550                         ++dev->stats.tx_errors;
 551                         dev_kfree_skb_any(skb);
 552                         return;
 553                 }
 554         } else {
 555                 if (unlikely(skb->len > priv->mcast_mtu + IPOIB_ENCAP_LEN)) {
 556                         ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
 557                                    skb->len, priv->mcast_mtu + IPOIB_ENCAP_LEN);
 558                         ++dev->stats.tx_dropped;
 559                         ++dev->stats.tx_errors;
 560                         ipoib_cm_skb_too_long(dev, skb, priv->mcast_mtu);
 561                         return;
 562                 }
 563                 phead = NULL;
 564                 hlen  = 0;
 565         }
 566
 567         ipoib_dbg_data(priv, "sending packet, length=%d address=%p qpn=0x%06x\n",
 568                        skb->len, address, qpn);
 569
 570         /*
 571          * We put the skb into the tx_ring _before_ we call post_send()
 572          * because it's entirely possible that the completion handler will
 573          * run before we execute anything after the post_send().  That
 574          * means we have to make sure everything is properly recorded and
 575          * our state is consistent before we call post_send().
 576          */
 577         tx_req = &priv->tx_ring[priv->tx_head & (ipoib_sendq_size - 1)];
 578         tx_req->skb = skb;
 579         if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req))) {
 580                 ++dev->stats.tx_errors;
 581                 dev_kfree_skb_any(skb);
 582                 return;
 583         }
 584
 585         if (skb->ip_summed == CHECKSUM_PARTIAL)
 586                 priv->tx_wr.send_flags |= IB_SEND_IP_CSUM;
 587         else
 588                 priv->tx_wr.send_flags &= ~IB_SEND_IP_CSUM;
 589
 590         if (++priv->tx_outstanding == ipoib_sendq_size) {
 591                 ipoib_dbg(priv, "TX ring full, stopping kernel net queue\n");
 592                 if (ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP))
 593                         ipoib_warn(priv, "request notify on send CQ failed\n");
 594                 netif_stop_queue(dev);
 595         }
 596
 597         rc = post_send(priv, priv->tx_head & (ipoib_sendq_size - 1),
 598                        address->ah, qpn, tx_req, phead, hlen);
 599         if (unlikely(rc)) {
 600                 ipoib_warn(priv, "post_send failed, error %d\n", rc);
 601                 ++dev->stats.tx_errors;
 602                 --priv->tx_outstanding;
 603                 ipoib_dma_unmap_tx(priv->ca, tx_req);
 604                 dev_kfree_skb_any(skb);
 605                 if (netif_queue_stopped(dev))
 606                         netif_wake_queue(dev);
 607         } else {
 608                 dev->trans_start = jiffies;
 609
 610                 address->last_send = priv->tx_head;
 611                 ++priv->tx_head;
 612                 skb_orphan(skb);
 613
 614         }
 615
 616         if (unlikely(priv->tx_outstanding > MAX_SEND_CQE))
 617                 while (poll_tx(priv))
 618                         ; /* nothing */
 619 }
 620
 621 static void __ipoib_reap_ah(struct net_device *dev)
 622 {
 623         struct ipoib_dev_priv *priv = netdev_priv(dev);
 624         struct ipoib_ah *ah, *tah;
 625         LIST_HEAD(remove_list);
 626         unsigned long flags;
 627
 628         netif_tx_lock_bh(dev);
 629         spin_lock_irqsave(&priv->lock, flags);
 630
 631         list_for_each_entry_safe(ah, tah, &priv->dead_ahs, list)
 632                 if ((int) priv->tx_tail - (int) ah->last_send >= 0) {
 633                         list_del(&ah->list);
 634                         ib_destroy_ah(ah->ah);
 635                         kfree(ah);
 636                 }
 637
 638         spin_unlock_irqrestore(&priv->lock, flags);
 639         netif_tx_unlock_bh(dev);
 640 }
 641
 642 void ipoib_reap_ah(struct work_struct *work)
 643 {
 644         struct ipoib_dev_priv *priv =
 645                 container_of(work, struct ipoib_dev_priv, ah_reap_task.work);
 646         struct net_device *dev = priv->dev;
 647
 648         __ipoib_reap_ah(dev);
 649
 650         if (!test_bit(IPOIB_STOP_REAPER, &priv->flags))
 651                 queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task,
 652                                    round_jiffies_relative(HZ));
 653 }
 654
 655 static void ipoib_ib_tx_timer_func(unsigned long ctx)
 656 {
 657         drain_tx_cq((struct net_device *)ctx);
 658 }
 659
 660 int ipoib_ib_dev_open(struct net_device *dev)
 661 {
 662         struct ipoib_dev_priv *priv = netdev_priv(dev);
 663         int ret;
 664
 665         if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &priv->pkey_index)) {
 666                 ipoib_warn(priv, "P_Key 0x%04x not found\n", priv->pkey);
 667                 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 668                 return -1;
 669         }
 670         set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 671
 672         ret = ipoib_init_qp(dev);
 673         if (ret) {
 674                 ipoib_warn(priv, "ipoib_init_qp returned %d\n", ret);
 675                 return -1;
 676         }
 677
 678         ret = ipoib_ib_post_receives(dev);
 679         if (ret) {
 680                 ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret);
 681                 ipoib_ib_dev_stop(dev, 1);
 682                 return -1;
 683         }
 684
 685         ret = ipoib_cm_dev_open(dev);
 686         if (ret) {
 687                 ipoib_warn(priv, "ipoib_cm_dev_open returned %d\n", ret);
 688                 ipoib_ib_dev_stop(dev, 1);
 689                 return -1;
 690         }
 691
 692         clear_bit(IPOIB_STOP_REAPER, &priv->flags);
 693         queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task,
 694                            round_jiffies_relative(HZ));
 695
 696         if (!test_and_set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
 697                 napi_enable(&priv->napi);
 698
 699         return 0;
 700 }
 701
 702 static void ipoib_pkey_dev_check_presence(struct net_device *dev)
 703 {
 704         struct ipoib_dev_priv *priv = netdev_priv(dev);
 705         u16 pkey_index = 0;
 706
 707         if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &pkey_index))
 708                 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 709         else
 710                 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 711 }
 712
 713 int ipoib_ib_dev_up(struct net_device *dev)
 714 {
 715         struct ipoib_dev_priv *priv = netdev_priv(dev);
 716
 717         ipoib_pkey_dev_check_presence(dev);
 718
 719         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
 720                 ipoib_dbg(priv, "PKEY is not assigned.\n");
 721                 return 0;
 722         }
 723
 724         set_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
 725
 726         return ipoib_mcast_start_thread(dev);
 727 }
 728
 729 int ipoib_ib_dev_down(struct net_device *dev, int flush)
 730 {
 731         struct ipoib_dev_priv *priv = netdev_priv(dev);
 732
 733         ipoib_dbg(priv, "downing ib_dev\n");
 734
 735         clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
 736         netif_carrier_off(dev);
 737
 738         /* Shutdown the P_Key thread if still active */
 739         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
 740                 mutex_lock(&pkey_mutex);
 741                 set_bit(IPOIB_PKEY_STOP, &priv->flags);
 742                 cancel_delayed_work(&priv->pkey_poll_task);
 743                 mutex_unlock(&pkey_mutex);
 744                 if (flush)
 745                         flush_workqueue(ipoib_workqueue);
 746         }
 747
 748         ipoib_mcast_stop_thread(dev, flush);
 749         ipoib_mcast_dev_flush(dev);
 750
 751         ipoib_flush_paths(dev);
 752
 753         return 0;
 754 }
 755
 756 static int recvs_pending(struct net_device *dev)
 757 {
 758         struct ipoib_dev_priv *priv = netdev_priv(dev);
 759         int pending = 0;
 760         int i;
 761
 762         for (i = 0; i < ipoib_recvq_size; ++i)
 763                 if (priv->rx_ring[i].skb)
 764                         ++pending;
 765
 766         return pending;
 767 }
 768
 769 void ipoib_drain_cq(struct net_device *dev)
 770 {
 771         struct ipoib_dev_priv *priv = netdev_priv(dev);
 772         int i, n;
 773
 774         /*
 775          * We call completion handling routines that expect to be
 776          * called from the BH-disabled NAPI poll context, so disable
 777          * BHs here too.
 778          */
 779         local_bh_disable();
 780
 781         do {
 782                 n = ib_poll_cq(priv->recv_cq, IPOIB_NUM_WC, priv->ibwc);
 783                 for (i = 0; i < n; ++i) {
 784                         /*
 785                          * Convert any successful completions to flush
 786                          * errors to avoid passing packets up the
 787                          * stack after bringing the device down.
 788                          */
 789                         if (priv->ibwc[i].status == IB_WC_SUCCESS)
 790                                 priv->ibwc[i].status = IB_WC_WR_FLUSH_ERR;
 791
 792                         if (priv->ibwc[i].wr_id & IPOIB_OP_RECV) {
 793                                 if (priv->ibwc[i].wr_id & IPOIB_OP_CM)
 794                                         ipoib_cm_handle_rx_wc(dev, priv->ibwc + i);
 795                                 else
 796                                         ipoib_ib_handle_rx_wc(dev, priv->ibwc + i);
 797                         } else
 798                                 ipoib_cm_handle_tx_wc(dev, priv->ibwc + i);
 799                 }
 800         } while (n == IPOIB_NUM_WC);
 801
 802         while (poll_tx(priv))
 803                 ; /* nothing */
 804
 805         local_bh_enable();
 806 }
 807
 808 int ipoib_ib_dev_stop(struct net_device *dev, int flush)
 809 {
 810         struct ipoib_dev_priv *priv = netdev_priv(dev);
 811         struct ib_qp_attr qp_attr;
 812         unsigned long begin;
 813         struct ipoib_tx_buf *tx_req;
 814         int i;
 815
 816         if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
 817                 napi_disable(&priv->napi);
 818
 819         ipoib_cm_dev_stop(dev);
 820
 821         /*
 822          * Move our QP to the error state and then reinitialize in
 823          * when all work requests have completed or have been flushed.
 824          */
 825         qp_attr.qp_state = IB_QPS_ERR;
 826         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
 827                 ipoib_warn(priv, "Failed to modify QP to ERROR state\n");
 828
 829         /* Wait for all sends and receives to complete */
 830         begin = jiffies;
 831
 832         while (priv->tx_head != priv->tx_tail || recvs_pending(dev)) {
 833                 if (time_after(jiffies, begin + 5 * HZ)) {
 834                         ipoib_warn(priv, "timing out; %d sends %d receives not completed\n",
 835                                    priv->tx_head - priv->tx_tail, recvs_pending(dev));
 836
 837                         /*
 838                          * assume the HW is wedged and just free up
 839                          * all our pending work requests.
 840                          */
 841                         while ((int) priv->tx_tail - (int) priv->tx_head < 0) {
 842                                 tx_req = &priv->tx_ring[priv->tx_tail &
 843                                                         (ipoib_sendq_size - 1)];
 844                                 ipoib_dma_unmap_tx(priv->ca, tx_req);
 845                                 dev_kfree_skb_any(tx_req->skb);
 846                                 ++priv->tx_tail;
 847                                 --priv->tx_outstanding;
 848                         }
 849
 850                         for (i = 0; i < ipoib_recvq_size; ++i) {
 851                                 struct ipoib_rx_buf *rx_req;
 852
 853                                 rx_req = &priv->rx_ring[i];
 854                                 if (!rx_req->skb)
 855                                         continue;
 856                                 ipoib_ud_dma_unmap_rx(priv,
 857                                                       priv->rx_ring[i].mapping);
 858                                 dev_kfree_skb_any(rx_req->skb);
 859                                 rx_req->skb = NULL;
 860                         }
 861
 862                         goto timeout;
 863                 }
 864
 865                 ipoib_drain_cq(dev);
 866
 867                 msleep(1);
 868         }
 869
 870         ipoib_dbg(priv, "All sends and receives done.\n");
 871
 872 timeout:
 873         del_timer_sync(&priv->poll_timer);
 874         qp_attr.qp_state = IB_QPS_RESET;
 875         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
 876                 ipoib_warn(priv, "Failed to modify QP to RESET state\n");
 877
 878         /* Wait for all AHs to be reaped */
 879         set_bit(IPOIB_STOP_REAPER, &priv->flags);
 880         cancel_delayed_work(&priv->ah_reap_task);
 881         if (flush)
 882                 flush_workqueue(ipoib_workqueue);
 883
 884         begin = jiffies;
 885
 886         while (!list_empty(&priv->dead_ahs)) {
 887                 __ipoib_reap_ah(dev);
 888
 889                 if (time_after(jiffies, begin + HZ)) {
 890                         ipoib_warn(priv, "timing out; will leak address handles\n");
 891                         break;
 892                 }
 893
 894                 msleep(1);
 895         }
 896
 897         ib_req_notify_cq(priv->recv_cq, IB_CQ_NEXT_COMP);
 898
 899         return 0;
 900 }
 901
 902 int ipoib_ib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
 903 {
 904         struct ipoib_dev_priv *priv = netdev_priv(dev);
 905
 906         priv->ca = ca;
 907         priv->port = port;
 908         priv->qp = NULL;
 909
 910         if (ipoib_transport_dev_init(dev, ca)) {
 911                 printk(KERN_WARNING "%s: ipoib_transport_dev_init failed\n", ca->name);
 912                 return -ENODEV;
 913         }
 914
 915         setup_timer(&priv->poll_timer, ipoib_ib_tx_timer_func,
 916                     (unsigned long) dev);
 917
 918         if (dev->flags & IFF_UP) {
 919                 if (ipoib_ib_dev_open(dev)) {
 920                         ipoib_transport_dev_cleanup(dev);
 921                         return -ENODEV;
 922                 }
 923         }
 924
 925         return 0;
 926 }
 927
 928 static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv,
 929                                 enum ipoib_flush_level level)
 930 {
 931         struct ipoib_dev_priv *cpriv;
 932         struct net_device *dev = priv->dev;
 933         u16 new_index;
 934
 935         mutex_lock(&priv->vlan_mutex);
 936
 937         /*
 938          * Flush any child interfaces too -- they might be up even if
 939          * the parent is down.
 940          */
 941         list_for_each_entry(cpriv, &priv->child_intfs, list)
 942                 __ipoib_ib_dev_flush(cpriv, level);
 943
 944         mutex_unlock(&priv->vlan_mutex);
 945
 946         if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) {
 947                 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n");
 948                 return;
 949         }
 950
 951         if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
 952                 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n");
 953                 return;
 954         }
 955
 956         if (level == IPOIB_FLUSH_HEAVY) {
 957                 if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &new_index)) {
 958                         clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 959                         ipoib_ib_dev_down(dev, 0);
 960                         ipoib_ib_dev_stop(dev, 0);
 961                         if (ipoib_pkey_dev_delay_open(dev))
 962                                 return;
 963                 }
 964
 965                 /* restart QP only if P_Key index is changed */
 966                 if (test_and_set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags) &&
 967                     new_index == priv->pkey_index) {
 968                         ipoib_dbg(priv, "Not flushing - P_Key index not changed.\n");
 969                         return;
 970                 }
 971                 priv->pkey_index = new_index;
 972         }
 973
 974         if (level == IPOIB_FLUSH_LIGHT) {
 975                 ipoib_mark_paths_invalid(dev);
 976                 ipoib_mcast_dev_flush(dev);
 977         }
 978
 979         if (level >= IPOIB_FLUSH_NORMAL)
 980                 ipoib_ib_dev_down(dev, 0);
 981
 982         if (level == IPOIB_FLUSH_HEAVY) {
 983                 ipoib_ib_dev_stop(dev, 0);
 984                 ipoib_ib_dev_open(dev);
 985         }
 986
 987         /*
 988          * The device could have been brought down between the start and when
 989          * we get here, don't bring it back up if it's not configured up
 990          */
 991         if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
 992                 if (level >= IPOIB_FLUSH_NORMAL)
 993                         ipoib_ib_dev_up(dev);
 994                 ipoib_mcast_restart_task(&priv->restart_task);
 995         }
 996 }
 997
 998 void ipoib_ib_dev_flush_light(struct work_struct *work)
 999 {
1000         struct ipoib_dev_priv *priv =
1001                 container_of(work, struct ipoib_dev_priv, flush_light);
1002
1003         __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_LIGHT);
1004 }
1005
1006 void ipoib_ib_dev_flush_normal(struct work_struct *work)
1007 {
1008         struct ipoib_dev_priv *priv =
1009                 container_of(work, struct ipoib_dev_priv, flush_normal);
1010
1011         __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_NORMAL);
1012 }
1013
1014 void ipoib_ib_dev_flush_heavy(struct work_struct *work)
1015 {
1016         struct ipoib_dev_priv *priv =
1017                 container_of(work, struct ipoib_dev_priv, flush_heavy);
1018
1019         __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_HEAVY);
1020 }
1021
1022 void ipoib_ib_dev_cleanup(struct net_device *dev)
1023 {
1024         struct ipoib_dev_priv *priv = netdev_priv(dev);
1025
1026         ipoib_dbg(priv, "cleaning up ib_dev\n");
1027
1028         ipoib_mcast_stop_thread(dev, 1);
1029         ipoib_mcast_dev_flush(dev);
1030
1031         ipoib_transport_dev_cleanup(dev);
1032 }
1033
1034 /*
1035  * Delayed P_Key Assigment Interim Support
1036  *
1037  * The following is initial implementation of delayed P_Key assigment
1038  * mechanism. It is using the same approach implemented for the multicast
1039  * group join. The single goal of this implementation is to quickly address
1040  * Bug #2507. This implementation will probably be removed when the P_Key
1041  * change async notification is available.
1042  */
1043
1044 void ipoib_pkey_poll(struct work_struct *work)
1045 {
1046         struct ipoib_dev_priv *priv =
1047                 container_of(work, struct ipoib_dev_priv, pkey_poll_task.work);
1048         struct net_device *dev = priv->dev;
1049
1050         ipoib_pkey_dev_check_presence(dev);
1051
1052         if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags))
1053                 ipoib_open(dev);
1054         else {
1055                 mutex_lock(&pkey_mutex);
1056                 if (!test_bit(IPOIB_PKEY_STOP, &priv->flags))
1057                         queue_delayed_work(ipoib_workqueue,
1058                                            &priv->pkey_poll_task,
1059                                            HZ);
1060                 mutex_unlock(&pkey_mutex);
1061         }
1062 }
1063
1064 int ipoib_pkey_dev_delay_open(struct net_device *dev)
1065 {
1066         struct ipoib_dev_priv *priv = netdev_priv(dev);
1067
1068         /* Look for the interface pkey value in the IB Port P_Key table and */
1069         /* set the interface pkey assigment flag                            */
1070         ipoib_pkey_dev_check_presence(dev);
1071
1072         /* P_Key value not assigned yet - start polling */
1073         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
1074                 mutex_lock(&pkey_mutex);
1075                 clear_bit(IPOIB_PKEY_STOP, &priv->flags);
1076                 queue_delayed_work(ipoib_workqueue,
1077                                    &priv->pkey_poll_task,
1078                                    HZ);
1079                 mutex_unlock(&pkey_mutex);
1080                 return 1;
1081         }
1082
1083         return 0;
1084 }