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
  39 #include <linux/ip.h>
  40 #include <linux/tcp.h>
  41
  42 #include "ipoib.h"
  43
  44 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA
  45 static int data_debug_level;
  46
  47 module_param(data_debug_level, int, 0644);
  48 MODULE_PARM_DESC(data_debug_level,
  49                  "Enable data path debug tracing if > 0");
  50 #endif
  51
  52 static DEFINE_MUTEX(pkey_mutex);
  53
  54 struct ipoib_ah *ipoib_create_ah(struct net_device *dev,
  55                                  struct ib_pd *pd, struct ib_ah_attr *attr)
  56 {
  57         struct ipoib_ah *ah;
  58
  59         ah = kmalloc(sizeof *ah, GFP_KERNEL);
  60         if (!ah)
  61                 return NULL;
  62
  63         ah->dev       = dev;
  64         ah->last_send = 0;
  65         kref_init(&ah->ref);
  66
  67         ah->ah = ib_create_ah(pd, attr);
  68         if (IS_ERR(ah->ah)) {
  69                 kfree(ah);
  70                 ah = NULL;
  71         } else
  72                 ipoib_dbg(netdev_priv(dev), "Created ah %p\n", ah->ah);
  73
  74         return ah;
  75 }
  76
  77 void ipoib_free_ah(struct kref *kref)
  78 {
  79         struct ipoib_ah *ah = container_of(kref, struct ipoib_ah, ref);
  80         struct ipoib_dev_priv *priv = netdev_priv(ah->dev);
  81
  82         unsigned long flags;
  83
  84         spin_lock_irqsave(&priv->lock, flags);
  85         list_add_tail(&ah->list, &priv->dead_ahs);
  86         spin_unlock_irqrestore(&priv->lock, flags);
  87 }
  88
  89 static void ipoib_ud_dma_unmap_rx(struct ipoib_dev_priv *priv,
  90                                   u64 mapping[IPOIB_UD_RX_SG])
  91 {
  92         if (ipoib_ud_need_sg(priv->max_ib_mtu)) {
  93                 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_UD_HEAD_SIZE,
  94                                     DMA_FROM_DEVICE);
  95                 ib_dma_unmap_page(priv->ca, mapping[1], PAGE_SIZE,
  96                                   DMA_FROM_DEVICE);
  97         } else
  98                 ib_dma_unmap_single(priv->ca, mapping[0],
  99                                     IPOIB_UD_BUF_SIZE(priv->max_ib_mtu),
 100                                     DMA_FROM_DEVICE);
 101 }
 102
 103 static void ipoib_ud_skb_put_frags(struct ipoib_dev_priv *priv,
 104                                    struct sk_buff *skb,
 105                                    unsigned int length)
 106 {
 107         if (ipoib_ud_need_sg(priv->max_ib_mtu)) {
 108                 skb_frag_t *frag = &skb_shinfo(skb)->frags[0];
 109                 unsigned int size;
 110                 /*
 111                  * There is only two buffers needed for max_payload = 4K,
 112                  * first buf size is IPOIB_UD_HEAD_SIZE
 113                  */
 114                 skb->tail += IPOIB_UD_HEAD_SIZE;
 115                 skb->len  += length;
 116
 117                 size = length - IPOIB_UD_HEAD_SIZE;
 118
 119                 frag->size     = size;
 120                 skb->data_len += size;
 121                 skb->truesize += size;
 122         } else
 123                 skb_put(skb, length);
 124
 125 }
 126
 127 static int ipoib_ib_post_receive(struct net_device *dev, int id)
 128 {
 129         struct ipoib_dev_priv *priv = netdev_priv(dev);
 130         struct ib_recv_wr *bad_wr;
 131         int ret;
 132
 133         priv->rx_wr.wr_id   = id | IPOIB_OP_RECV;
 134         priv->rx_sge[0].addr = priv->rx_ring[id].mapping[0];
 135         priv->rx_sge[1].addr = priv->rx_ring[id].mapping[1];
 136
 137
 138         ret = ib_post_recv(priv->qp, &priv->rx_wr, &bad_wr);
 139         if (unlikely(ret)) {
 140                 ipoib_warn(priv, "receive failed for buf %d (%d)\n", id, ret);
 141                 ipoib_ud_dma_unmap_rx(priv, priv->rx_ring[id].mapping);
 142                 dev_kfree_skb_any(priv->rx_ring[id].skb);
 143                 priv->rx_ring[id].skb = NULL;
 144         }
 145
 146         return ret;
 147 }
 148
 149 static struct sk_buff *ipoib_alloc_rx_skb(struct net_device *dev, int id)
 150 {
 151         struct ipoib_dev_priv *priv = netdev_priv(dev);
 152         struct sk_buff *skb;
 153         int buf_size;
 154         u64 *mapping;
 155
 156         if (ipoib_ud_need_sg(priv->max_ib_mtu))
 157                 buf_size = IPOIB_UD_HEAD_SIZE;
 158         else
 159                 buf_size = IPOIB_UD_BUF_SIZE(priv->max_ib_mtu);
 160
 161         skb = dev_alloc_skb(buf_size + 4);
 162         if (unlikely(!skb))
 163                 return NULL;
 164
 165         /*
 166          * IB will leave a 40 byte gap for a GRH and IPoIB adds a 4 byte
 167          * header.  So we need 4 more bytes to get to 48 and align the
 168          * IP header to a multiple of 16.
 169          */
 170         skb_reserve(skb, 4);
 171
 172         mapping = priv->rx_ring[id].mapping;
 173         mapping[0] = ib_dma_map_single(priv->ca, skb->data, buf_size,
 174                                        DMA_FROM_DEVICE);
 175         if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0])))
 176                 goto error;
 177
 178         if (ipoib_ud_need_sg(priv->max_ib_mtu)) {
 179                 struct page *page = alloc_page(GFP_ATOMIC);
 180                 if (!page)
 181                         goto partial_error;
 182                 skb_fill_page_desc(skb, 0, page, 0, PAGE_SIZE);
 183                 mapping[1] =
 184                         ib_dma_map_page(priv->ca, skb_shinfo(skb)->frags[0].page,
 185                                         0, PAGE_SIZE, DMA_FROM_DEVICE);
 186                 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[1])))
 187                         goto partial_error;
 188         }
 189
 190         priv->rx_ring[id].skb = skb;
 191         return skb;
 192
 193 partial_error:
 194         ib_dma_unmap_single(priv->ca, mapping[0], buf_size, DMA_FROM_DEVICE);
 195 error:
 196         dev_kfree_skb_any(skb);
 197         return NULL;
 198 }
 199
 200 static int ipoib_ib_post_receives(struct net_device *dev)
 201 {
 202         struct ipoib_dev_priv *priv = netdev_priv(dev);
 203         int i;
 204
 205         for (i = 0; i < ipoib_recvq_size; ++i) {
 206                 if (!ipoib_alloc_rx_skb(dev, i)) {
 207                         ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
 208                         return -ENOMEM;
 209                 }
 210                 if (ipoib_ib_post_receive(dev, i)) {
 211                         ipoib_warn(priv, "ipoib_ib_post_receive failed for buf %d\n", i);
 212                         return -EIO;
 213                 }
 214         }
 215
 216         return 0;
 217 }
 218
 219 static void ipoib_ib_handle_rx_wc(struct net_device *dev, struct ib_wc *wc)
 220 {
 221         struct ipoib_dev_priv *priv = netdev_priv(dev);
 222         unsigned int wr_id = wc->wr_id & ~IPOIB_OP_RECV;
 223         struct sk_buff *skb;
 224         u64 mapping[IPOIB_UD_RX_SG];
 225
 226         ipoib_dbg_data(priv, "recv completion: id %d, status: %d\n",
 227                        wr_id, wc->status);
 228
 229         if (unlikely(wr_id >= ipoib_recvq_size)) {
 230                 ipoib_warn(priv, "recv completion event with wrid %d (> %d)\n",
 231                            wr_id, ipoib_recvq_size);
 232                 return;
 233         }
 234
 235         skb  = priv->rx_ring[wr_id].skb;
 236
 237         if (unlikely(wc->status != IB_WC_SUCCESS)) {
 238                 if (wc->status != IB_WC_WR_FLUSH_ERR)
 239                         ipoib_warn(priv, "failed recv event "
 240                                    "(status=%d, wrid=%d vend_err %x)\n",
 241                                    wc->status, wr_id, wc->vendor_err);
 242                 ipoib_ud_dma_unmap_rx(priv, priv->rx_ring[wr_id].mapping);
 243                 dev_kfree_skb_any(skb);
 244                 priv->rx_ring[wr_id].skb = NULL;
 245                 return;
 246         }
 247
 248         /*
 249          * Drop packets that this interface sent, ie multicast packets
 250          * that the HCA has replicated.
 251          */
 252         if (wc->slid == priv->local_lid && wc->src_qp == priv->qp->qp_num)
 253                 goto repost;
 254
 255         memcpy(mapping, priv->rx_ring[wr_id].mapping,
 256                IPOIB_UD_RX_SG * sizeof *mapping);
 257
 258         /*
 259          * If we can't allocate a new RX buffer, dump
 260          * this packet and reuse the old buffer.
 261          */
 262         if (unlikely(!ipoib_alloc_rx_skb(dev, wr_id))) {
 263                 ++dev->stats.rx_dropped;
 264                 goto repost;
 265         }
 266
 267         ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
 268                        wc->byte_len, wc->slid);
 269
 270         ipoib_ud_dma_unmap_rx(priv, mapping);
 271         ipoib_ud_skb_put_frags(priv, skb, wc->byte_len);
 272
 273         skb_pull(skb, IB_GRH_BYTES);
 274
 275         skb->protocol = ((struct ipoib_header *) skb->data)->proto;
 276         skb_reset_mac_header(skb);
 277         skb_pull(skb, IPOIB_ENCAP_LEN);
 278
 279         ++dev->stats.rx_packets;
 280         dev->stats.rx_bytes += skb->len;
 281
 282         skb->dev = dev;
 283         /* XXX get correct PACKET_ type here */
 284         skb->pkt_type = PACKET_HOST;
 285
 286         if (test_bit(IPOIB_FLAG_CSUM, &priv->flags) && likely(wc->csum_ok))
 287                 skb->ip_summed = CHECKSUM_UNNECESSARY;
 288
 289         if (dev->features & NETIF_F_LRO)
 290                 lro_receive_skb(&priv->lro.lro_mgr, skb, NULL);
 291         else
 292                 netif_receive_skb(skb);
 293
 294 repost:
 295         if (unlikely(ipoib_ib_post_receive(dev, wr_id)))
 296                 ipoib_warn(priv, "ipoib_ib_post_receive failed "
 297                            "for buf %d\n", wr_id);
 298 }
 299
 300 static int ipoib_dma_map_tx(struct ib_device *ca,
 301                             struct ipoib_tx_buf *tx_req)
 302 {
 303         struct sk_buff *skb = tx_req->skb;
 304         u64 *mapping = tx_req->mapping;
 305         int i;
 306         int off;
 307
 308         if (skb_headlen(skb)) {
 309                 mapping[0] = ib_dma_map_single(ca, skb->data, skb_headlen(skb),
 310                                                DMA_TO_DEVICE);
 311                 if (unlikely(ib_dma_mapping_error(ca, mapping[0])))
 312                         return -EIO;
 313
 314                 off = 1;
 315         } else
 316                 off = 0;
 317
 318         for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) {
 319                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 320                 mapping[i + off] = ib_dma_map_page(ca, frag->page,
 321                                                  frag->page_offset, frag->size,
 322                                                  DMA_TO_DEVICE);
 323                 if (unlikely(ib_dma_mapping_error(ca, mapping[i + off])))
 324                         goto partial_error;
 325         }
 326         return 0;
 327
 328 partial_error:
 329         for (; i > 0; --i) {
 330                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i - 1];
 331                 ib_dma_unmap_page(ca, mapping[i - !off], frag->size, DMA_TO_DEVICE);
 332         }
 333
 334         if (off)
 335                 ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE);
 336
 337         return -EIO;
 338 }
 339
 340 static void ipoib_dma_unmap_tx(struct ib_device *ca,
 341                                struct ipoib_tx_buf *tx_req)
 342 {
 343         struct sk_buff *skb = tx_req->skb;
 344         u64 *mapping = tx_req->mapping;
 345         int i;
 346         int off;
 347
 348         if (skb_headlen(skb)) {
 349                 ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE);
 350                 off = 1;
 351         } else
 352                 off = 0;
 353
 354         for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) {
 355                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 356                 ib_dma_unmap_page(ca, mapping[i + off], frag->size,
 357                                   DMA_TO_DEVICE);
 358         }
 359 }
 360
 361 static void ipoib_ib_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
 362 {
 363         struct ipoib_dev_priv *priv = netdev_priv(dev);
 364         unsigned int wr_id = wc->wr_id;
 365         struct ipoib_tx_buf *tx_req;
 366
 367         ipoib_dbg_data(priv, "send completion: id %d, status: %d\n",
 368                        wr_id, wc->status);
 369
 370         if (unlikely(wr_id >= ipoib_sendq_size)) {
 371                 ipoib_warn(priv, "send completion event with wrid %d (> %d)\n",
 372                            wr_id, ipoib_sendq_size);
 373                 return;
 374         }
 375
 376         tx_req = &priv->tx_ring[wr_id];
 377
 378         ipoib_dma_unmap_tx(priv->ca, tx_req);
 379
 380         ++dev->stats.tx_packets;
 381         dev->stats.tx_bytes += tx_req->skb->len;
 382
 383         dev_kfree_skb_any(tx_req->skb);
 384
 385         ++priv->tx_tail;
 386         if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
 387             netif_queue_stopped(dev) &&
 388             test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
 389                 netif_wake_queue(dev);
 390
 391         if (wc->status != IB_WC_SUCCESS &&
 392             wc->status != IB_WC_WR_FLUSH_ERR)
 393                 ipoib_warn(priv, "failed send event "
 394                            "(status=%d, wrid=%d vend_err %x)\n",
 395                            wc->status, wr_id, wc->vendor_err);
 396 }
 397
 398 static int poll_tx(struct ipoib_dev_priv *priv)
 399 {
 400         int n, i;
 401
 402         n = ib_poll_cq(priv->send_cq, MAX_SEND_CQE, priv->send_wc);
 403         for (i = 0; i < n; ++i)
 404                 ipoib_ib_handle_tx_wc(priv->dev, priv->send_wc + i);
 405
 406         return n == MAX_SEND_CQE;
 407 }
 408
 409 int ipoib_poll(struct napi_struct *napi, int budget)
 410 {
 411         struct ipoib_dev_priv *priv = container_of(napi, struct ipoib_dev_priv, napi);
 412         struct net_device *dev = priv->dev;
 413         int done;
 414         int t;
 415         int n, i;
 416
 417         done  = 0;
 418
 419 poll_more:
 420         while (done < budget) {
 421                 int max = (budget - done);
 422
 423                 t = min(IPOIB_NUM_WC, max);
 424                 n = ib_poll_cq(priv->recv_cq, t, priv->ibwc);
 425
 426                 for (i = 0; i < n; i++) {
 427                         struct ib_wc *wc = priv->ibwc + i;
 428
 429                         if (wc->wr_id & IPOIB_OP_RECV) {
 430                                 ++done;
 431                                 if (wc->wr_id & IPOIB_OP_CM)
 432                                         ipoib_cm_handle_rx_wc(dev, wc);
 433                                 else
 434                                         ipoib_ib_handle_rx_wc(dev, wc);
 435                         } else
 436                                 ipoib_cm_handle_tx_wc(priv->dev, wc);
 437                 }
 438
 439                 if (n != t)
 440                         break;
 441         }
 442
 443         if (done < budget) {
 444                 if (dev->features & NETIF_F_LRO)
 445                         lro_flush_all(&priv->lro.lro_mgr);
 446
 447                 napi_complete(napi);
 448                 if (unlikely(ib_req_notify_cq(priv->recv_cq,
 449                                               IB_CQ_NEXT_COMP |
 450                                               IB_CQ_REPORT_MISSED_EVENTS)) &&
 451                     napi_reschedule(napi))
 452                         goto poll_more;
 453         }
 454
 455         return done;
 456 }
 457
 458 void ipoib_ib_completion(struct ib_cq *cq, void *dev_ptr)
 459 {
 460         struct net_device *dev = dev_ptr;
 461         struct ipoib_dev_priv *priv = netdev_priv(dev);
 462
 463         napi_schedule(&priv->napi);
 464 }
 465
 466 static void drain_tx_cq(struct net_device *dev)
 467 {
 468         struct ipoib_dev_priv *priv = netdev_priv(dev);
 469
 470         netif_tx_lock(dev);
 471         while (poll_tx(priv))
 472                 ; /* nothing */
 473
 474         if (netif_queue_stopped(dev))
 475                 mod_timer(&priv->poll_timer, jiffies + 1);
 476
 477         netif_tx_unlock(dev);
 478 }
 479
 480 void ipoib_send_comp_handler(struct ib_cq *cq, void *dev_ptr)
 481 {
 482         struct ipoib_dev_priv *priv = netdev_priv(dev_ptr);
 483
 484         mod_timer(&priv->poll_timer, jiffies);
 485 }
 486
 487 static inline int post_send(struct ipoib_dev_priv *priv,
 488                             unsigned int wr_id,
 489                             struct ib_ah *address, u32 qpn,
 490                             struct ipoib_tx_buf *tx_req,
 491                             void *head, int hlen)
 492 {
 493         struct ib_send_wr *bad_wr;
 494         int i, off;
 495         struct sk_buff *skb = tx_req->skb;
 496         skb_frag_t *frags = skb_shinfo(skb)->frags;
 497         int nr_frags = skb_shinfo(skb)->nr_frags;
 498         u64 *mapping = tx_req->mapping;
 499
 500         if (skb_headlen(skb)) {
 501                 priv->tx_sge[0].addr         = mapping[0];
 502                 priv->tx_sge[0].length       = skb_headlen(skb);
 503                 off = 1;
 504         } else
 505                 off = 0;
 506
 507         for (i = 0; i < nr_frags; ++i) {
 508                 priv->tx_sge[i + off].addr = mapping[i + off];
 509                 priv->tx_sge[i + off].length = frags[i].size;
 510         }
 511         priv->tx_wr.num_sge          = nr_frags + off;
 512         priv->tx_wr.wr_id            = wr_id;
 513         priv->tx_wr.wr.ud.remote_qpn = qpn;
 514         priv->tx_wr.wr.ud.ah         = address;
 515
 516         if (head) {
 517                 priv->tx_wr.wr.ud.mss    = skb_shinfo(skb)->gso_size;
 518                 priv->tx_wr.wr.ud.header = head;
 519                 priv->tx_wr.wr.ud.hlen   = hlen;
 520                 priv->tx_wr.opcode       = IB_WR_LSO;
 521         } else
 522                 priv->tx_wr.opcode       = IB_WR_SEND;
 523
 524         return ib_post_send(priv->qp, &priv->tx_wr, &bad_wr);
 525 }
 526
 527 void ipoib_send(struct net_device *dev, struct sk_buff *skb,
 528                 struct ipoib_ah *address, u32 qpn)
 529 {
 530         struct ipoib_dev_priv *priv = netdev_priv(dev);
 531         struct ipoib_tx_buf *tx_req;
 532         int hlen;
 533         void *phead;
 534
 535         if (skb_is_gso(skb)) {
 536                 hlen = skb_transport_offset(skb) + tcp_hdrlen(skb);
 537                 phead = skb->data;
 538                 if (unlikely(!skb_pull(skb, hlen))) {
 539                         ipoib_warn(priv, "linear data too small\n");
 540                         ++dev->stats.tx_dropped;
 541                         ++dev->stats.tx_errors;
 542                         dev_kfree_skb_any(skb);
 543                         return;
 544                 }
 545         } else {
 546                 if (unlikely(skb->len > priv->mcast_mtu + IPOIB_ENCAP_LEN)) {
 547                         ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
 548                                    skb->len, priv->mcast_mtu + IPOIB_ENCAP_LEN);
 549                         ++dev->stats.tx_dropped;
 550                         ++dev->stats.tx_errors;
 551                         ipoib_cm_skb_too_long(dev, skb, priv->mcast_mtu);
 552                         return;
 553                 }
 554                 phead = NULL;
 555                 hlen  = 0;
 556         }
 557
 558         ipoib_dbg_data(priv, "sending packet, length=%d address=%p qpn=0x%06x\n",
 559                        skb->len, address, qpn);
 560
 561         /*
 562          * We put the skb into the tx_ring _before_ we call post_send()
 563          * because it's entirely possible that the completion handler will
 564          * run before we execute anything after the post_send().  That
 565          * means we have to make sure everything is properly recorded and
 566          * our state is consistent before we call post_send().
 567          */
 568         tx_req = &priv->tx_ring[priv->tx_head & (ipoib_sendq_size - 1)];
 569         tx_req->skb = skb;
 570         if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req))) {
 571                 ++dev->stats.tx_errors;
 572                 dev_kfree_skb_any(skb);
 573                 return;
 574         }
 575
 576         if (skb->ip_summed == CHECKSUM_PARTIAL)
 577                 priv->tx_wr.send_flags |= IB_SEND_IP_CSUM;
 578         else
 579                 priv->tx_wr.send_flags &= ~IB_SEND_IP_CSUM;
 580
 581         if (++priv->tx_outstanding == ipoib_sendq_size) {
 582                 ipoib_dbg(priv, "TX ring full, stopping kernel net queue\n");
 583                 if (ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP))
 584                         ipoib_warn(priv, "request notify on send CQ failed\n");
 585                 netif_stop_queue(dev);
 586         }
 587
 588         if (unlikely(post_send(priv, priv->tx_head & (ipoib_sendq_size - 1),
 589                                address->ah, qpn, tx_req, phead, hlen))) {
 590                 ipoib_warn(priv, "post_send failed\n");
 591                 ++dev->stats.tx_errors;
 592                 --priv->tx_outstanding;
 593                 ipoib_dma_unmap_tx(priv->ca, tx_req);
 594                 dev_kfree_skb_any(skb);
 595                 if (netif_queue_stopped(dev))
 596                         netif_wake_queue(dev);
 597         } else {
 598                 dev->trans_start = jiffies;
 599
 600                 address->last_send = priv->tx_head;
 601                 ++priv->tx_head;
 602                 skb_orphan(skb);
 603
 604         }
 605
 606         if (unlikely(priv->tx_outstanding > MAX_SEND_CQE))
 607                 while (poll_tx(priv))
 608                         ; /* nothing */
 609 }
 610
 611 static void __ipoib_reap_ah(struct net_device *dev)
 612 {
 613         struct ipoib_dev_priv *priv = netdev_priv(dev);
 614         struct ipoib_ah *ah, *tah;
 615         LIST_HEAD(remove_list);
 616         unsigned long flags;
 617
 618         netif_tx_lock_bh(dev);
 619         spin_lock_irqsave(&priv->lock, flags);
 620
 621         list_for_each_entry_safe(ah, tah, &priv->dead_ahs, list)
 622                 if ((int) priv->tx_tail - (int) ah->last_send >= 0) {
 623                         list_del(&ah->list);
 624                         ib_destroy_ah(ah->ah);
 625                         kfree(ah);
 626                 }
 627
 628         spin_unlock_irqrestore(&priv->lock, flags);
 629         netif_tx_unlock_bh(dev);
 630 }
 631
 632 void ipoib_reap_ah(struct work_struct *work)
 633 {
 634         struct ipoib_dev_priv *priv =
 635                 container_of(work, struct ipoib_dev_priv, ah_reap_task.work);
 636         struct net_device *dev = priv->dev;
 637
 638         __ipoib_reap_ah(dev);
 639
 640         if (!test_bit(IPOIB_STOP_REAPER, &priv->flags))
 641                 queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task,
 642                                    round_jiffies_relative(HZ));
 643 }
 644
 645 static void ipoib_ib_tx_timer_func(unsigned long ctx)
 646 {
 647         drain_tx_cq((struct net_device *)ctx);
 648 }
 649
 650 int ipoib_ib_dev_open(struct net_device *dev)
 651 {
 652         struct ipoib_dev_priv *priv = netdev_priv(dev);
 653         int ret;
 654
 655         if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &priv->pkey_index)) {
 656                 ipoib_warn(priv, "P_Key 0x%04x not found\n", priv->pkey);
 657                 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 658                 return -1;
 659         }
 660         set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 661
 662         ret = ipoib_init_qp(dev);
 663         if (ret) {
 664                 ipoib_warn(priv, "ipoib_init_qp returned %d\n", ret);
 665                 return -1;
 666         }
 667
 668         ret = ipoib_ib_post_receives(dev);
 669         if (ret) {
 670                 ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret);
 671                 ipoib_ib_dev_stop(dev, 1);
 672                 return -1;
 673         }
 674
 675         ret = ipoib_cm_dev_open(dev);
 676         if (ret) {
 677                 ipoib_warn(priv, "ipoib_cm_dev_open returned %d\n", ret);
 678                 ipoib_ib_dev_stop(dev, 1);
 679                 return -1;
 680         }
 681
 682         clear_bit(IPOIB_STOP_REAPER, &priv->flags);
 683         queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task,
 684                            round_jiffies_relative(HZ));
 685
 686         if (!test_and_set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
 687                 napi_enable(&priv->napi);
 688
 689         return 0;
 690 }
 691
 692 static void ipoib_pkey_dev_check_presence(struct net_device *dev)
 693 {
 694         struct ipoib_dev_priv *priv = netdev_priv(dev);
 695         u16 pkey_index = 0;
 696
 697         if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &pkey_index))
 698                 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 699         else
 700                 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 701 }
 702
 703 int ipoib_ib_dev_up(struct net_device *dev)
 704 {
 705         struct ipoib_dev_priv *priv = netdev_priv(dev);
 706
 707         ipoib_pkey_dev_check_presence(dev);
 708
 709         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
 710                 ipoib_dbg(priv, "PKEY is not assigned.\n");
 711                 return 0;
 712         }
 713
 714         set_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
 715
 716         return ipoib_mcast_start_thread(dev);
 717 }
 718
 719 int ipoib_ib_dev_down(struct net_device *dev, int flush)
 720 {
 721         struct ipoib_dev_priv *priv = netdev_priv(dev);
 722
 723         ipoib_dbg(priv, "downing ib_dev\n");
 724
 725         clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
 726         netif_carrier_off(dev);
 727
 728         /* Shutdown the P_Key thread if still active */
 729         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
 730                 mutex_lock(&pkey_mutex);
 731                 set_bit(IPOIB_PKEY_STOP, &priv->flags);
 732                 cancel_delayed_work(&priv->pkey_poll_task);
 733                 mutex_unlock(&pkey_mutex);
 734                 if (flush)
 735                         flush_workqueue(ipoib_workqueue);
 736         }
 737
 738         ipoib_mcast_stop_thread(dev, flush);
 739         ipoib_mcast_dev_flush(dev);
 740
 741         ipoib_flush_paths(dev);
 742
 743         return 0;
 744 }
 745
 746 static int recvs_pending(struct net_device *dev)
 747 {
 748         struct ipoib_dev_priv *priv = netdev_priv(dev);
 749         int pending = 0;
 750         int i;
 751
 752         for (i = 0; i < ipoib_recvq_size; ++i)
 753                 if (priv->rx_ring[i].skb)
 754                         ++pending;
 755
 756         return pending;
 757 }
 758
 759 void ipoib_drain_cq(struct net_device *dev)
 760 {
 761         struct ipoib_dev_priv *priv = netdev_priv(dev);
 762         int i, n;
 763
 764         /*
 765          * We call completion handling routines that expect to be
 766          * called from the BH-disabled NAPI poll context, so disable
 767          * BHs here too.
 768          */
 769         local_bh_disable();
 770
 771         do {
 772                 n = ib_poll_cq(priv->recv_cq, IPOIB_NUM_WC, priv->ibwc);
 773                 for (i = 0; i < n; ++i) {
 774                         /*
 775                          * Convert any successful completions to flush
 776                          * errors to avoid passing packets up the
 777                          * stack after bringing the device down.
 778                          */
 779                         if (priv->ibwc[i].status == IB_WC_SUCCESS)
 780                                 priv->ibwc[i].status = IB_WC_WR_FLUSH_ERR;
 781
 782                         if (priv->ibwc[i].wr_id & IPOIB_OP_RECV) {
 783                                 if (priv->ibwc[i].wr_id & IPOIB_OP_CM)
 784                                         ipoib_cm_handle_rx_wc(dev, priv->ibwc + i);
 785                                 else
 786                                         ipoib_ib_handle_rx_wc(dev, priv->ibwc + i);
 787                         } else
 788                                 ipoib_cm_handle_tx_wc(dev, priv->ibwc + i);
 789                 }
 790         } while (n == IPOIB_NUM_WC);
 791
 792         while (poll_tx(priv))
 793                 ; /* nothing */
 794
 795         local_bh_enable();
 796 }
 797
 798 int ipoib_ib_dev_stop(struct net_device *dev, int flush)
 799 {
 800         struct ipoib_dev_priv *priv = netdev_priv(dev);
 801         struct ib_qp_attr qp_attr;
 802         unsigned long begin;
 803         struct ipoib_tx_buf *tx_req;
 804         int i;
 805
 806         if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
 807                 napi_disable(&priv->napi);
 808
 809         ipoib_cm_dev_stop(dev);
 810
 811         /*
 812          * Move our QP to the error state and then reinitialize in
 813          * when all work requests have completed or have been flushed.
 814          */
 815         qp_attr.qp_state = IB_QPS_ERR;
 816         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
 817                 ipoib_warn(priv, "Failed to modify QP to ERROR state\n");
 818
 819         /* Wait for all sends and receives to complete */
 820         begin = jiffies;
 821
 822         while (priv->tx_head != priv->tx_tail || recvs_pending(dev)) {
 823                 if (time_after(jiffies, begin + 5 * HZ)) {
 824                         ipoib_warn(priv, "timing out; %d sends %d receives not completed\n",
 825                                    priv->tx_head - priv->tx_tail, recvs_pending(dev));
 826
 827                         /*
 828                          * assume the HW is wedged and just free up
 829                          * all our pending work requests.
 830                          */
 831                         while ((int) priv->tx_tail - (int) priv->tx_head < 0) {
 832                                 tx_req = &priv->tx_ring[priv->tx_tail &
 833                                                         (ipoib_sendq_size - 1)];
 834                                 ipoib_dma_unmap_tx(priv->ca, tx_req);
 835                                 dev_kfree_skb_any(tx_req->skb);
 836                                 ++priv->tx_tail;
 837                                 --priv->tx_outstanding;
 838                         }
 839
 840                         for (i = 0; i < ipoib_recvq_size; ++i) {
 841                                 struct ipoib_rx_buf *rx_req;
 842
 843                                 rx_req = &priv->rx_ring[i];
 844                                 if (!rx_req->skb)
 845                                         continue;
 846                                 ipoib_ud_dma_unmap_rx(priv,
 847                                                       priv->rx_ring[i].mapping);
 848                                 dev_kfree_skb_any(rx_req->skb);
 849                                 rx_req->skb = NULL;
 850                         }
 851
 852                         goto timeout;
 853                 }
 854
 855                 ipoib_drain_cq(dev);
 856
 857                 msleep(1);
 858         }
 859
 860         ipoib_dbg(priv, "All sends and receives done.\n");
 861
 862 timeout:
 863         del_timer_sync(&priv->poll_timer);
 864         qp_attr.qp_state = IB_QPS_RESET;
 865         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
 866                 ipoib_warn(priv, "Failed to modify QP to RESET state\n");
 867
 868         /* Wait for all AHs to be reaped */
 869         set_bit(IPOIB_STOP_REAPER, &priv->flags);
 870         cancel_delayed_work(&priv->ah_reap_task);
 871         if (flush)
 872                 flush_workqueue(ipoib_workqueue);
 873
 874         begin = jiffies;
 875
 876         while (!list_empty(&priv->dead_ahs)) {
 877                 __ipoib_reap_ah(dev);
 878
 879                 if (time_after(jiffies, begin + HZ)) {
 880                         ipoib_warn(priv, "timing out; will leak address handles\n");
 881                         break;
 882                 }
 883
 884                 msleep(1);
 885         }
 886
 887         ib_req_notify_cq(priv->recv_cq, IB_CQ_NEXT_COMP);
 888
 889         return 0;
 890 }
 891
 892 int ipoib_ib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
 893 {
 894         struct ipoib_dev_priv *priv = netdev_priv(dev);
 895
 896         priv->ca = ca;
 897         priv->port = port;
 898         priv->qp = NULL;
 899
 900         if (ipoib_transport_dev_init(dev, ca)) {
 901                 printk(KERN_WARNING "%s: ipoib_transport_dev_init failed\n", ca->name);
 902                 return -ENODEV;
 903         }
 904
 905         setup_timer(&priv->poll_timer, ipoib_ib_tx_timer_func,
 906                     (unsigned long) dev);
 907
 908         if (dev->flags & IFF_UP) {
 909                 if (ipoib_ib_dev_open(dev)) {
 910                         ipoib_transport_dev_cleanup(dev);
 911                         return -ENODEV;
 912                 }
 913         }
 914
 915         return 0;
 916 }
 917
 918 static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv,
 919                                 enum ipoib_flush_level level)
 920 {
 921         struct ipoib_dev_priv *cpriv;
 922         struct net_device *dev = priv->dev;
 923         u16 new_index;
 924
 925         mutex_lock(&priv->vlan_mutex);
 926
 927         /*
 928          * Flush any child interfaces too -- they might be up even if
 929          * the parent is down.
 930          */
 931         list_for_each_entry(cpriv, &priv->child_intfs, list)
 932                 __ipoib_ib_dev_flush(cpriv, level);
 933
 934         mutex_unlock(&priv->vlan_mutex);
 935
 936         if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) {
 937                 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n");
 938                 return;
 939         }
 940
 941         if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
 942                 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n");
 943                 return;
 944         }
 945
 946         if (level == IPOIB_FLUSH_HEAVY) {
 947                 if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &new_index)) {
 948                         clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 949                         ipoib_ib_dev_down(dev, 0);
 950                         ipoib_ib_dev_stop(dev, 0);
 951                         if (ipoib_pkey_dev_delay_open(dev))
 952                                 return;
 953                 }
 954
 955                 /* restart QP only if P_Key index is changed */
 956                 if (test_and_set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags) &&
 957                     new_index == priv->pkey_index) {
 958                         ipoib_dbg(priv, "Not flushing - P_Key index not changed.\n");
 959                         return;
 960                 }
 961                 priv->pkey_index = new_index;
 962         }
 963
 964         if (level == IPOIB_FLUSH_LIGHT) {
 965                 ipoib_mark_paths_invalid(dev);
 966                 ipoib_mcast_dev_flush(dev);
 967         }
 968
 969         if (level >= IPOIB_FLUSH_NORMAL)
 970                 ipoib_ib_dev_down(dev, 0);
 971
 972         if (level == IPOIB_FLUSH_HEAVY) {
 973                 ipoib_ib_dev_stop(dev, 0);
 974                 ipoib_ib_dev_open(dev);
 975         }
 976
 977         /*
 978          * The device could have been brought down between the start and when
 979          * we get here, don't bring it back up if it's not configured up
 980          */
 981         if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
 982                 if (level >= IPOIB_FLUSH_NORMAL)
 983                         ipoib_ib_dev_up(dev);
 984                 ipoib_mcast_restart_task(&priv->restart_task);
 985         }
 986 }
 987
 988 void ipoib_ib_dev_flush_light(struct work_struct *work)
 989 {
 990         struct ipoib_dev_priv *priv =
 991                 container_of(work, struct ipoib_dev_priv, flush_light);
 992
 993         __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_LIGHT);
 994 }
 995
 996 void ipoib_ib_dev_flush_normal(struct work_struct *work)
 997 {
 998         struct ipoib_dev_priv *priv =
 999                 container_of(work, struct ipoib_dev_priv, flush_normal);
1000
1001         __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_NORMAL);
1002 }
1003
1004 void ipoib_ib_dev_flush_heavy(struct work_struct *work)
1005 {
1006         struct ipoib_dev_priv *priv =
1007                 container_of(work, struct ipoib_dev_priv, flush_heavy);
1008
1009         __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_HEAVY);
1010 }
1011
1012 void ipoib_ib_dev_cleanup(struct net_device *dev)
1013 {
1014         struct ipoib_dev_priv *priv = netdev_priv(dev);
1015
1016         ipoib_dbg(priv, "cleaning up ib_dev\n");
1017
1018         ipoib_mcast_stop_thread(dev, 1);
1019         ipoib_mcast_dev_flush(dev);
1020
1021         ipoib_transport_dev_cleanup(dev);
1022 }
1023
1024 /*
1025  * Delayed P_Key Assigment Interim Support
1026  *
1027  * The following is initial implementation of delayed P_Key assigment
1028  * mechanism. It is using the same approach implemented for the multicast
1029  * group join. The single goal of this implementation is to quickly address
1030  * Bug #2507. This implementation will probably be removed when the P_Key
1031  * change async notification is available.
1032  */
1033
1034 void ipoib_pkey_poll(struct work_struct *work)
1035 {
1036         struct ipoib_dev_priv *priv =
1037                 container_of(work, struct ipoib_dev_priv, pkey_poll_task.work);
1038         struct net_device *dev = priv->dev;
1039
1040         ipoib_pkey_dev_check_presence(dev);
1041
1042         if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags))
1043                 ipoib_open(dev);
1044         else {
1045                 mutex_lock(&pkey_mutex);
1046                 if (!test_bit(IPOIB_PKEY_STOP, &priv->flags))
1047                         queue_delayed_work(ipoib_workqueue,
1048                                            &priv->pkey_poll_task,
1049                                            HZ);
1050                 mutex_unlock(&pkey_mutex);
1051         }
1052 }
1053
1054 int ipoib_pkey_dev_delay_open(struct net_device *dev)
1055 {
1056         struct ipoib_dev_priv *priv = netdev_priv(dev);
1057
1058         /* Look for the interface pkey value in the IB Port P_Key table and */
1059         /* set the interface pkey assigment flag                            */
1060         ipoib_pkey_dev_check_presence(dev);
1061
1062         /* P_Key value not assigned yet - start polling */
1063         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
1064                 mutex_lock(&pkey_mutex);
1065                 clear_bit(IPOIB_PKEY_STOP, &priv->flags);
1066                 queue_delayed_work(ipoib_workqueue,
1067                                    &priv->pkey_poll_task,
1068                                    HZ);
1069                 mutex_unlock(&pkey_mutex);
1070                 return 1;
1071         }
1072
1073         return 0;
1074 }