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/moduleparam.h>
  38 #include <linux/dma-mapping.h>
  39 #include <linux/slab.h>
  40
  41 #include <linux/ip.h>
  42 #include <linux/tcp.h>
  43
  44 #include "ipoib.h"
  45
  46 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA
  47 static int data_debug_level;
  48
  49 module_param(data_debug_level, int, 0644);
  50 MODULE_PARM_DESC(data_debug_level,
  51                  "Enable data path debug tracing if > 0");
  52 #endif
  53
  54 static DEFINE_MUTEX(pkey_mutex);
  55
  56 struct ipoib_ah *ipoib_create_ah(struct net_device *dev,
  57                                  struct ib_pd *pd, struct ib_ah_attr *attr)
  58 {
  59         struct ipoib_ah *ah;
  60         struct ib_ah *vah;
  61
  62         ah = kmalloc(sizeof *ah, GFP_KERNEL);
  63         if (!ah)
  64                 return ERR_PTR(-ENOMEM);
  65
  66         ah->dev       = dev;
  67         ah->last_send = 0;
  68         kref_init(&ah->ref);
  69
  70         vah = ib_create_ah(pd, attr);
  71         if (IS_ERR(vah)) {
  72                 kfree(ah);
  73                 ah = (struct ipoib_ah *)vah;
  74         } else {
  75                 ah->ah = vah;
  76                 ipoib_dbg(netdev_priv(dev), "Created ah %p\n", ah->ah);
  77         }
  78
  79         return ah;
  80 }
  81
  82 void ipoib_free_ah(struct kref *kref)
  83 {
  84         struct ipoib_ah *ah = container_of(kref, struct ipoib_ah, ref);
  85         struct ipoib_dev_priv *priv = netdev_priv(ah->dev);
  86
  87         unsigned long flags;
  88
  89         spin_lock_irqsave(&priv->lock, flags);
  90         list_add_tail(&ah->list, &priv->dead_ahs);
  91         spin_unlock_irqrestore(&priv->lock, flags);
  92 }
  93
  94 static void ipoib_ud_dma_unmap_rx(struct ipoib_dev_priv *priv,
  95                                   u64 mapping[IPOIB_UD_RX_SG])
  96 {
  97         if (ipoib_ud_need_sg(priv->max_ib_mtu)) {
  98                 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_UD_HEAD_SIZE,
  99                                     DMA_FROM_DEVICE);
 100                 ib_dma_unmap_page(priv->ca, mapping[1], PAGE_SIZE,
 101                                   DMA_FROM_DEVICE);
 102         } else
 103                 ib_dma_unmap_single(priv->ca, mapping[0],
 104                                     IPOIB_UD_BUF_SIZE(priv->max_ib_mtu),
 105                                     DMA_FROM_DEVICE);
 106 }
 107
 108 static void ipoib_ud_skb_put_frags(struct ipoib_dev_priv *priv,
 109                                    struct sk_buff *skb,
 110                                    unsigned int length)
 111 {
 112         if (ipoib_ud_need_sg(priv->max_ib_mtu)) {
 113                 skb_frag_t *frag = &skb_shinfo(skb)->frags[0];
 114                 unsigned int size;
 115                 /*
 116                  * There is only two buffers needed for max_payload = 4K,
 117                  * first buf size is IPOIB_UD_HEAD_SIZE
 118                  */
 119                 skb->tail += IPOIB_UD_HEAD_SIZE;
 120                 skb->len  += length;
 121
 122                 size = length - IPOIB_UD_HEAD_SIZE;
 123
 124                 skb_frag_size_set(frag, size);
 125                 skb->data_len += size;
 126                 skb->truesize += size;
 127         } else
 128                 skb_put(skb, length);
 129
 130 }
 131
 132 static int ipoib_ib_post_receive(struct net_device *dev, int id)
 133 {
 134         struct ipoib_dev_priv *priv = netdev_priv(dev);
 135         struct ib_recv_wr *bad_wr;
 136         int ret;
 137
 138         priv->rx_wr.wr_id   = id | IPOIB_OP_RECV;
 139         priv->rx_sge[0].addr = priv->rx_ring[id].mapping[0];
 140         priv->rx_sge[1].addr = priv->rx_ring[id].mapping[1];
 141
 142
 143         ret = ib_post_recv(priv->qp, &priv->rx_wr, &bad_wr);
 144         if (unlikely(ret)) {
 145                 ipoib_warn(priv, "receive failed for buf %d (%d)\n", id, ret);
 146                 ipoib_ud_dma_unmap_rx(priv, priv->rx_ring[id].mapping);
 147                 dev_kfree_skb_any(priv->rx_ring[id].skb);
 148                 priv->rx_ring[id].skb = NULL;
 149         }
 150
 151         return ret;
 152 }
 153
 154 static struct sk_buff *ipoib_alloc_rx_skb(struct net_device *dev, int id)
 155 {
 156         struct ipoib_dev_priv *priv = netdev_priv(dev);
 157         struct sk_buff *skb;
 158         int buf_size;
 159         u64 *mapping;
 160
 161         if (ipoib_ud_need_sg(priv->max_ib_mtu))
 162                 buf_size = IPOIB_UD_HEAD_SIZE;
 163         else
 164                 buf_size = IPOIB_UD_BUF_SIZE(priv->max_ib_mtu);
 165
 166         skb = dev_alloc_skb(buf_size + 4);
 167         if (unlikely(!skb))
 168                 return NULL;
 169
 170         /*
 171          * IB will leave a 40 byte gap for a GRH and IPoIB adds a 4 byte
 172          * header.  So we need 4 more bytes to get to 48 and align the
 173          * IP header to a multiple of 16.
 174          */
 175         skb_reserve(skb, 4);
 176
 177         mapping = priv->rx_ring[id].mapping;
 178         mapping[0] = ib_dma_map_single(priv->ca, skb->data, buf_size,
 179                                        DMA_FROM_DEVICE);
 180         if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0])))
 181                 goto error;
 182
 183         if (ipoib_ud_need_sg(priv->max_ib_mtu)) {
 184                 struct page *page = alloc_page(GFP_ATOMIC);
 185                 if (!page)
 186                         goto partial_error;
 187                 skb_fill_page_desc(skb, 0, page, 0, PAGE_SIZE);
 188                 mapping[1] =
 189                         ib_dma_map_page(priv->ca, page,
 190                                         0, PAGE_SIZE, DMA_FROM_DEVICE);
 191                 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[1])))
 192                         goto partial_error;
 193         }
 194
 195         priv->rx_ring[id].skb = skb;
 196         return skb;
 197
 198 partial_error:
 199         ib_dma_unmap_single(priv->ca, mapping[0], buf_size, DMA_FROM_DEVICE);
 200 error:
 201         dev_kfree_skb_any(skb);
 202         return NULL;
 203 }
 204
 205 static int ipoib_ib_post_receives(struct net_device *dev)
 206 {
 207         struct ipoib_dev_priv *priv = netdev_priv(dev);
 208         int i;
 209
 210         for (i = 0; i < ipoib_recvq_size; ++i) {
 211                 if (!ipoib_alloc_rx_skb(dev, i)) {
 212                         ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
 213                         return -ENOMEM;
 214                 }
 215                 if (ipoib_ib_post_receive(dev, i)) {
 216                         ipoib_warn(priv, "ipoib_ib_post_receive failed for buf %d\n", i);
 217                         return -EIO;
 218                 }
 219         }
 220
 221         return 0;
 222 }
 223
 224 static void ipoib_ib_handle_rx_wc(struct net_device *dev, struct ib_wc *wc)
 225 {
 226         struct ipoib_dev_priv *priv = netdev_priv(dev);
 227         unsigned int wr_id = wc->wr_id & ~IPOIB_OP_RECV;
 228         struct sk_buff *skb;
 229         u64 mapping[IPOIB_UD_RX_SG];
 230         union ib_gid *dgid;
 231
 232         ipoib_dbg_data(priv, "recv completion: id %d, status: %d\n",
 233                        wr_id, wc->status);
 234
 235         if (unlikely(wr_id >= ipoib_recvq_size)) {
 236                 ipoib_warn(priv, "recv completion event with wrid %d (> %d)\n",
 237                            wr_id, ipoib_recvq_size);
 238                 return;
 239         }
 240
 241         skb  = priv->rx_ring[wr_id].skb;
 242
 243         if (unlikely(wc->status != IB_WC_SUCCESS)) {
 244                 if (wc->status != IB_WC_WR_FLUSH_ERR)
 245                         ipoib_warn(priv, "failed recv event "
 246                                    "(status=%d, wrid=%d vend_err %x)\n",
 247                                    wc->status, wr_id, wc->vendor_err);
 248                 ipoib_ud_dma_unmap_rx(priv, priv->rx_ring[wr_id].mapping);
 249                 dev_kfree_skb_any(skb);
 250                 priv->rx_ring[wr_id].skb = NULL;
 251                 return;
 252         }
 253
 254         /*
 255          * Drop packets that this interface sent, ie multicast packets
 256          * that the HCA has replicated.
 257          */
 258         if (wc->slid == priv->local_lid && wc->src_qp == priv->qp->qp_num)
 259                 goto repost;
 260
 261         memcpy(mapping, priv->rx_ring[wr_id].mapping,
 262                IPOIB_UD_RX_SG * sizeof *mapping);
 263
 264         /*
 265          * If we can't allocate a new RX buffer, dump
 266          * this packet and reuse the old buffer.
 267          */
 268         if (unlikely(!ipoib_alloc_rx_skb(dev, wr_id))) {
 269                 ++dev->stats.rx_dropped;
 270                 goto repost;
 271         }
 272
 273         ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
 274                        wc->byte_len, wc->slid);
 275
 276         ipoib_ud_dma_unmap_rx(priv, mapping);
 277         ipoib_ud_skb_put_frags(priv, skb, wc->byte_len);
 278
 279         /* First byte of dgid signals multicast when 0xff */
 280         dgid = &((struct ib_grh *)skb->data)->dgid;
 281
 282         if (!(wc->wc_flags & IB_WC_GRH) || dgid->raw[0] != 0xff)
 283                 skb->pkt_type = PACKET_HOST;
 284         else if (memcmp(dgid, dev->broadcast + 4, sizeof(union ib_gid)) == 0)
 285                 skb->pkt_type = PACKET_BROADCAST;
 286         else
 287                 skb->pkt_type = PACKET_MULTICAST;
 288
 289         skb_pull(skb, IB_GRH_BYTES);
 290
 291         skb->protocol = ((struct ipoib_header *) skb->data)->proto;
 292         skb_reset_mac_header(skb);
 293         skb_pull(skb, IPOIB_ENCAP_LEN);
 294
 295         ++dev->stats.rx_packets;
 296         dev->stats.rx_bytes += skb->len;
 297
 298         skb->dev = dev;
 299         if ((dev->features & NETIF_F_RXCSUM) && likely(wc->csum_ok))
 300                 skb->ip_summed = CHECKSUM_UNNECESSARY;
 301
 302         napi_gro_receive(&priv->napi, skb);
 303
 304 repost:
 305         if (unlikely(ipoib_ib_post_receive(dev, wr_id)))
 306                 ipoib_warn(priv, "ipoib_ib_post_receive failed "
 307                            "for buf %d\n", wr_id);
 308 }
 309
 310 static int ipoib_dma_map_tx(struct ib_device *ca,
 311                             struct ipoib_tx_buf *tx_req)
 312 {
 313         struct sk_buff *skb = tx_req->skb;
 314         u64 *mapping = tx_req->mapping;
 315         int i;
 316         int off;
 317
 318         if (skb_headlen(skb)) {
 319                 mapping[0] = ib_dma_map_single(ca, skb->data, skb_headlen(skb),
 320                                                DMA_TO_DEVICE);
 321                 if (unlikely(ib_dma_mapping_error(ca, mapping[0])))
 322                         return -EIO;
 323
 324                 off = 1;
 325         } else
 326                 off = 0;
 327
 328         for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) {
 329                 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 330                 mapping[i + off] = ib_dma_map_page(ca,
 331                                                  skb_frag_page(frag),
 332                                                  frag->page_offset, skb_frag_size(frag),
 333                                                  DMA_TO_DEVICE);
 334                 if (unlikely(ib_dma_mapping_error(ca, mapping[i + off])))
 335                         goto partial_error;
 336         }
 337         return 0;
 338
 339 partial_error:
 340         for (; i > 0; --i) {
 341                 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i - 1];
 342
 343                 ib_dma_unmap_page(ca, mapping[i - !off], skb_frag_size(frag), DMA_TO_DEVICE);
 344         }
 345
 346         if (off)
 347                 ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE);
 348
 349         return -EIO;
 350 }
 351
 352 static void ipoib_dma_unmap_tx(struct ib_device *ca,
 353                                struct ipoib_tx_buf *tx_req)
 354 {
 355         struct sk_buff *skb = tx_req->skb;
 356         u64 *mapping = tx_req->mapping;
 357         int i;
 358         int off;
 359
 360         if (skb_headlen(skb)) {
 361                 ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE);
 362                 off = 1;
 363         } else
 364                 off = 0;
 365
 366         for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) {
 367                 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 368
 369                 ib_dma_unmap_page(ca, mapping[i + off], skb_frag_size(frag),
 370                                   DMA_TO_DEVICE);
 371         }
 372 }
 373
 374 static void ipoib_ib_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
 375 {
 376         struct ipoib_dev_priv *priv = netdev_priv(dev);
 377         unsigned int wr_id = wc->wr_id;
 378         struct ipoib_tx_buf *tx_req;
 379
 380         ipoib_dbg_data(priv, "send completion: id %d, status: %d\n",
 381                        wr_id, wc->status);
 382
 383         if (unlikely(wr_id >= ipoib_sendq_size)) {
 384                 ipoib_warn(priv, "send completion event with wrid %d (> %d)\n",
 385                            wr_id, ipoib_sendq_size);
 386                 return;
 387         }
 388
 389         tx_req = &priv->tx_ring[wr_id];
 390
 391         ipoib_dma_unmap_tx(priv->ca, tx_req);
 392
 393         ++dev->stats.tx_packets;
 394         dev->stats.tx_bytes += tx_req->skb->len;
 395
 396         dev_kfree_skb_any(tx_req->skb);
 397
 398         ++priv->tx_tail;
 399         if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
 400             netif_queue_stopped(dev) &&
 401             test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
 402                 netif_wake_queue(dev);
 403
 404         if (wc->status != IB_WC_SUCCESS &&
 405             wc->status != IB_WC_WR_FLUSH_ERR)
 406                 ipoib_warn(priv, "failed send event "
 407                            "(status=%d, wrid=%d vend_err %x)\n",
 408                            wc->status, wr_id, wc->vendor_err);
 409 }
 410
 411 static int poll_tx(struct ipoib_dev_priv *priv)
 412 {
 413         int n, i;
 414
 415         n = ib_poll_cq(priv->send_cq, MAX_SEND_CQE, priv->send_wc);
 416         for (i = 0; i < n; ++i)
 417                 ipoib_ib_handle_tx_wc(priv->dev, priv->send_wc + i);
 418
 419         return n == MAX_SEND_CQE;
 420 }
 421
 422 int ipoib_poll(struct napi_struct *napi, int budget)
 423 {
 424         struct ipoib_dev_priv *priv = container_of(napi, struct ipoib_dev_priv, napi);
 425         struct net_device *dev = priv->dev;
 426         int done;
 427         int t;
 428         int n, i;
 429
 430         done  = 0;
 431
 432 poll_more:
 433         while (done < budget) {
 434                 int max = (budget - done);
 435
 436                 t = min(IPOIB_NUM_WC, max);
 437                 n = ib_poll_cq(priv->recv_cq, t, priv->ibwc);
 438
 439                 for (i = 0; i < n; i++) {
 440                         struct ib_wc *wc = priv->ibwc + i;
 441
 442                         if (wc->wr_id & IPOIB_OP_RECV) {
 443                                 ++done;
 444                                 if (wc->wr_id & IPOIB_OP_CM)
 445                                         ipoib_cm_handle_rx_wc(dev, wc);
 446                                 else
 447                                         ipoib_ib_handle_rx_wc(dev, wc);
 448                         } else
 449                                 ipoib_cm_handle_tx_wc(priv->dev, wc);
 450                 }
 451
 452                 if (n != t)
 453                         break;
 454         }
 455
 456         if (done < budget) {
 457                 napi_complete(napi);
 458                 if (unlikely(ib_req_notify_cq(priv->recv_cq,
 459                                               IB_CQ_NEXT_COMP |
 460                                               IB_CQ_REPORT_MISSED_EVENTS)) &&
 461                     napi_reschedule(napi))
 462                         goto poll_more;
 463         }
 464
 465         return done;
 466 }
 467
 468 void ipoib_ib_completion(struct ib_cq *cq, void *dev_ptr)
 469 {
 470         struct net_device *dev = dev_ptr;
 471         struct ipoib_dev_priv *priv = netdev_priv(dev);
 472
 473         napi_schedule(&priv->napi);
 474 }
 475
 476 static void drain_tx_cq(struct net_device *dev)
 477 {
 478         struct ipoib_dev_priv *priv = netdev_priv(dev);
 479
 480         netif_tx_lock(dev);
 481         while (poll_tx(priv))
 482                 ; /* nothing */
 483
 484         if (netif_queue_stopped(dev))
 485                 mod_timer(&priv->poll_timer, jiffies + 1);
 486
 487         netif_tx_unlock(dev);
 488 }
 489
 490 void ipoib_send_comp_handler(struct ib_cq *cq, void *dev_ptr)
 491 {
 492         struct ipoib_dev_priv *priv = netdev_priv(dev_ptr);
 493
 494         mod_timer(&priv->poll_timer, jiffies);
 495 }
 496
 497 static inline int post_send(struct ipoib_dev_priv *priv,
 498                             unsigned int wr_id,
 499                             struct ib_ah *address, u32 qpn,
 500                             struct ipoib_tx_buf *tx_req,
 501                             void *head, int hlen)
 502 {
 503         struct ib_send_wr *bad_wr;
 504         int i, off;
 505         struct sk_buff *skb = tx_req->skb;
 506         skb_frag_t *frags = skb_shinfo(skb)->frags;
 507         int nr_frags = skb_shinfo(skb)->nr_frags;
 508         u64 *mapping = tx_req->mapping;
 509
 510         if (skb_headlen(skb)) {
 511                 priv->tx_sge[0].addr         = mapping[0];
 512                 priv->tx_sge[0].length       = skb_headlen(skb);
 513                 off = 1;
 514         } else
 515                 off = 0;
 516
 517         for (i = 0; i < nr_frags; ++i) {
 518                 priv->tx_sge[i + off].addr = mapping[i + off];
 519                 priv->tx_sge[i + off].length = skb_frag_size(&frags[i]);
 520         }
 521         priv->tx_wr.num_sge          = nr_frags + off;
 522         priv->tx_wr.wr_id            = wr_id;
 523         priv->tx_wr.wr.ud.remote_qpn = qpn;
 524         priv->tx_wr.wr.ud.ah         = address;
 525
 526         if (head) {
 527                 priv->tx_wr.wr.ud.mss    = skb_shinfo(skb)->gso_size;
 528                 priv->tx_wr.wr.ud.header = head;
 529                 priv->tx_wr.wr.ud.hlen   = hlen;
 530                 priv->tx_wr.opcode       = IB_WR_LSO;
 531         } else
 532                 priv->tx_wr.opcode       = IB_WR_SEND;
 533
 534         return ib_post_send(priv->qp, &priv->tx_wr, &bad_wr);
 535 }
 536
 537 void ipoib_send(struct net_device *dev, struct sk_buff *skb,
 538                 struct ipoib_ah *address, u32 qpn)
 539 {
 540         struct ipoib_dev_priv *priv = netdev_priv(dev);
 541         struct ipoib_tx_buf *tx_req;
 542         int hlen, rc;
 543         void *phead;
 544
 545         if (skb_is_gso(skb)) {
 546                 hlen = skb_transport_offset(skb) + tcp_hdrlen(skb);
 547                 phead = skb->data;
 548                 if (unlikely(!skb_pull(skb, hlen))) {
 549                         ipoib_warn(priv, "linear data too small\n");
 550                         ++dev->stats.tx_dropped;
 551                         ++dev->stats.tx_errors;
 552                         dev_kfree_skb_any(skb);
 553                         return;
 554                 }
 555         } else {
 556                 if (unlikely(skb->len > priv->mcast_mtu + IPOIB_ENCAP_LEN)) {
 557                         ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
 558                                    skb->len, priv->mcast_mtu + IPOIB_ENCAP_LEN);
 559                         ++dev->stats.tx_dropped;
 560                         ++dev->stats.tx_errors;
 561                         ipoib_cm_skb_too_long(dev, skb, priv->mcast_mtu);
 562                         return;
 563                 }
 564                 phead = NULL;
 565                 hlen  = 0;
 566         }
 567
 568         ipoib_dbg_data(priv, "sending packet, length=%d address=%p qpn=0x%06x\n",
 569                        skb->len, address, qpn);
 570
 571         /*
 572          * We put the skb into the tx_ring _before_ we call post_send()
 573          * because it's entirely possible that the completion handler will
 574          * run before we execute anything after the post_send().  That
 575          * means we have to make sure everything is properly recorded and
 576          * our state is consistent before we call post_send().
 577          */
 578         tx_req = &priv->tx_ring[priv->tx_head & (ipoib_sendq_size - 1)];
 579         tx_req->skb = skb;
 580         if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req))) {
 581                 ++dev->stats.tx_errors;
 582                 dev_kfree_skb_any(skb);
 583                 return;
 584         }
 585
 586         if (skb->ip_summed == CHECKSUM_PARTIAL)
 587                 priv->tx_wr.send_flags |= IB_SEND_IP_CSUM;
 588         else
 589                 priv->tx_wr.send_flags &= ~IB_SEND_IP_CSUM;
 590
 591         if (++priv->tx_outstanding == ipoib_sendq_size) {
 592                 ipoib_dbg(priv, "TX ring full, stopping kernel net queue\n");
 593                 if (ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP))
 594                         ipoib_warn(priv, "request notify on send CQ failed\n");
 595                 netif_stop_queue(dev);
 596         }
 597
 598         rc = post_send(priv, priv->tx_head & (ipoib_sendq_size - 1),
 599                        address->ah, qpn, tx_req, phead, hlen);
 600         if (unlikely(rc)) {
 601                 ipoib_warn(priv, "post_send failed, error %d\n", rc);
 602                 ++dev->stats.tx_errors;
 603                 --priv->tx_outstanding;
 604                 ipoib_dma_unmap_tx(priv->ca, tx_req);
 605                 dev_kfree_skb_any(skb);
 606                 if (netif_queue_stopped(dev))
 607                         netif_wake_queue(dev);
 608         } else {
 609                 dev->trans_start = jiffies;
 610
 611                 address->last_send = priv->tx_head;
 612                 ++priv->tx_head;
 613                 skb_orphan(skb);
 614
 615         }
 616
 617         if (unlikely(priv->tx_outstanding > MAX_SEND_CQE))
 618                 while (poll_tx(priv))
 619                         ; /* nothing */
 620 }
 621
 622 static void __ipoib_reap_ah(struct net_device *dev)
 623 {
 624         struct ipoib_dev_priv *priv = netdev_priv(dev);
 625         struct ipoib_ah *ah, *tah;
 626         LIST_HEAD(remove_list);
 627         unsigned long flags;
 628
 629         netif_tx_lock_bh(dev);
 630         spin_lock_irqsave(&priv->lock, flags);
 631
 632         list_for_each_entry_safe(ah, tah, &priv->dead_ahs, list)
 633                 if ((int) priv->tx_tail - (int) ah->last_send >= 0) {
 634                         list_del(&ah->list);
 635                         ib_destroy_ah(ah->ah);
 636                         kfree(ah);
 637                 }
 638
 639         spin_unlock_irqrestore(&priv->lock, flags);
 640         netif_tx_unlock_bh(dev);
 641 }
 642
 643 void ipoib_reap_ah(struct work_struct *work)
 644 {
 645         struct ipoib_dev_priv *priv =
 646                 container_of(work, struct ipoib_dev_priv, ah_reap_task.work);
 647         struct net_device *dev = priv->dev;
 648
 649         __ipoib_reap_ah(dev);
 650
 651         if (!test_bit(IPOIB_STOP_REAPER, &priv->flags))
 652                 queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task,
 653                                    round_jiffies_relative(HZ));
 654 }
 655
 656 static void ipoib_ib_tx_timer_func(unsigned long ctx)
 657 {
 658         drain_tx_cq((struct net_device *)ctx);
 659 }
 660
 661 int ipoib_ib_dev_open(struct net_device *dev)
 662 {
 663         struct ipoib_dev_priv *priv = netdev_priv(dev);
 664         int ret;
 665
 666         if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &priv->pkey_index)) {
 667                 ipoib_warn(priv, "P_Key 0x%04x not found\n", priv->pkey);
 668                 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 669                 return -1;
 670         }
 671         set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 672
 673         ret = ipoib_init_qp(dev);
 674         if (ret) {
 675                 ipoib_warn(priv, "ipoib_init_qp returned %d\n", ret);
 676                 return -1;
 677         }
 678
 679         ret = ipoib_ib_post_receives(dev);
 680         if (ret) {
 681                 ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret);
 682                 ipoib_ib_dev_stop(dev, 1);
 683                 return -1;
 684         }
 685
 686         ret = ipoib_cm_dev_open(dev);
 687         if (ret) {
 688                 ipoib_warn(priv, "ipoib_cm_dev_open returned %d\n", ret);
 689                 ipoib_ib_dev_stop(dev, 1);
 690                 return -1;
 691         }
 692
 693         clear_bit(IPOIB_STOP_REAPER, &priv->flags);
 694         queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task,
 695                            round_jiffies_relative(HZ));
 696
 697         if (!test_and_set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
 698                 napi_enable(&priv->napi);
 699
 700         return 0;
 701 }
 702
 703 static void ipoib_pkey_dev_check_presence(struct net_device *dev)
 704 {
 705         struct ipoib_dev_priv *priv = netdev_priv(dev);
 706         u16 pkey_index = 0;
 707
 708         if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &pkey_index))
 709                 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 710         else
 711                 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 712 }
 713
 714 int ipoib_ib_dev_up(struct net_device *dev)
 715 {
 716         struct ipoib_dev_priv *priv = netdev_priv(dev);
 717
 718         ipoib_pkey_dev_check_presence(dev);
 719
 720         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
 721                 ipoib_dbg(priv, "PKEY is not assigned.\n");
 722                 return 0;
 723         }
 724
 725         set_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
 726
 727         return ipoib_mcast_start_thread(dev);
 728 }
 729
 730 int ipoib_ib_dev_down(struct net_device *dev, int flush)
 731 {
 732         struct ipoib_dev_priv *priv = netdev_priv(dev);
 733
 734         ipoib_dbg(priv, "downing ib_dev\n");
 735
 736         clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
 737         netif_carrier_off(dev);
 738
 739         /* Shutdown the P_Key thread if still active */
 740         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
 741                 mutex_lock(&pkey_mutex);
 742                 set_bit(IPOIB_PKEY_STOP, &priv->flags);
 743                 cancel_delayed_work(&priv->pkey_poll_task);
 744                 mutex_unlock(&pkey_mutex);
 745                 if (flush)
 746                         flush_workqueue(ipoib_workqueue);
 747         }
 748
 749         ipoib_mcast_stop_thread(dev, flush);
 750         ipoib_mcast_dev_flush(dev);
 751
 752         ipoib_flush_paths(dev);
 753
 754         return 0;
 755 }
 756
 757 static int recvs_pending(struct net_device *dev)
 758 {
 759         struct ipoib_dev_priv *priv = netdev_priv(dev);
 760         int pending = 0;
 761         int i;
 762
 763         for (i = 0; i < ipoib_recvq_size; ++i)
 764                 if (priv->rx_ring[i].skb)
 765                         ++pending;
 766
 767         return pending;
 768 }
 769
 770 void ipoib_drain_cq(struct net_device *dev)
 771 {
 772         struct ipoib_dev_priv *priv = netdev_priv(dev);
 773         int i, n;
 774
 775         /*
 776          * We call completion handling routines that expect to be
 777          * called from the BH-disabled NAPI poll context, so disable
 778          * BHs here too.
 779          */
 780         local_bh_disable();
 781
 782         do {
 783                 n = ib_poll_cq(priv->recv_cq, IPOIB_NUM_WC, priv->ibwc);
 784                 for (i = 0; i < n; ++i) {
 785                         /*
 786                          * Convert any successful completions to flush
 787                          * errors to avoid passing packets up the
 788                          * stack after bringing the device down.
 789                          */
 790                         if (priv->ibwc[i].status == IB_WC_SUCCESS)
 791                                 priv->ibwc[i].status = IB_WC_WR_FLUSH_ERR;
 792
 793                         if (priv->ibwc[i].wr_id & IPOIB_OP_RECV) {
 794                                 if (priv->ibwc[i].wr_id & IPOIB_OP_CM)
 795                                         ipoib_cm_handle_rx_wc(dev, priv->ibwc + i);
 796                                 else
 797                                         ipoib_ib_handle_rx_wc(dev, priv->ibwc + i);
 798                         } else
 799                                 ipoib_cm_handle_tx_wc(dev, priv->ibwc + i);
 800                 }
 801         } while (n == IPOIB_NUM_WC);
 802
 803         while (poll_tx(priv))
 804                 ; /* nothing */
 805
 806         local_bh_enable();
 807 }
 808
 809 int ipoib_ib_dev_stop(struct net_device *dev, int flush)
 810 {
 811         struct ipoib_dev_priv *priv = netdev_priv(dev);
 812         struct ib_qp_attr qp_attr;
 813         unsigned long begin;
 814         struct ipoib_tx_buf *tx_req;
 815         int i;
 816
 817         if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
 818                 napi_disable(&priv->napi);
 819
 820         ipoib_cm_dev_stop(dev);
 821
 822         /*
 823          * Move our QP to the error state and then reinitialize in
 824          * when all work requests have completed or have been flushed.
 825          */
 826         qp_attr.qp_state = IB_QPS_ERR;
 827         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
 828                 ipoib_warn(priv, "Failed to modify QP to ERROR state\n");
 829
 830         /* Wait for all sends and receives to complete */
 831         begin = jiffies;
 832
 833         while (priv->tx_head != priv->tx_tail || recvs_pending(dev)) {
 834                 if (time_after(jiffies, begin + 5 * HZ)) {
 835                         ipoib_warn(priv, "timing out; %d sends %d receives not completed\n",
 836                                    priv->tx_head - priv->tx_tail, recvs_pending(dev));
 837
 838                         /*
 839                          * assume the HW is wedged and just free up
 840                          * all our pending work requests.
 841                          */
 842                         while ((int) priv->tx_tail - (int) priv->tx_head < 0) {
 843                                 tx_req = &priv->tx_ring[priv->tx_tail &
 844                                                         (ipoib_sendq_size - 1)];
 845                                 ipoib_dma_unmap_tx(priv->ca, tx_req);
 846                                 dev_kfree_skb_any(tx_req->skb);
 847                                 ++priv->tx_tail;
 848                                 --priv->tx_outstanding;
 849                         }
 850
 851                         for (i = 0; i < ipoib_recvq_size; ++i) {
 852                                 struct ipoib_rx_buf *rx_req;
 853
 854                                 rx_req = &priv->rx_ring[i];
 855                                 if (!rx_req->skb)
 856                                         continue;
 857                                 ipoib_ud_dma_unmap_rx(priv,
 858                                                       priv->rx_ring[i].mapping);
 859                                 dev_kfree_skb_any(rx_req->skb);
 860                                 rx_req->skb = NULL;
 861                         }
 862
 863                         goto timeout;
 864                 }
 865
 866                 ipoib_drain_cq(dev);
 867
 868                 msleep(1);
 869         }
 870
 871         ipoib_dbg(priv, "All sends and receives done.\n");
 872
 873 timeout:
 874         del_timer_sync(&priv->poll_timer);
 875         qp_attr.qp_state = IB_QPS_RESET;
 876         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
 877                 ipoib_warn(priv, "Failed to modify QP to RESET state\n");
 878
 879         /* Wait for all AHs to be reaped */
 880         set_bit(IPOIB_STOP_REAPER, &priv->flags);
 881         cancel_delayed_work(&priv->ah_reap_task);
 882         if (flush)
 883                 flush_workqueue(ipoib_workqueue);
 884
 885         begin = jiffies;
 886
 887         while (!list_empty(&priv->dead_ahs)) {
 888                 __ipoib_reap_ah(dev);
 889
 890                 if (time_after(jiffies, begin + HZ)) {
 891                         ipoib_warn(priv, "timing out; will leak address handles\n");
 892                         break;
 893                 }
 894
 895                 msleep(1);
 896         }
 897
 898         ib_req_notify_cq(priv->recv_cq, IB_CQ_NEXT_COMP);
 899
 900         return 0;
 901 }
 902
 903 int ipoib_ib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
 904 {
 905         struct ipoib_dev_priv *priv = netdev_priv(dev);
 906
 907         priv->ca = ca;
 908         priv->port = port;
 909         priv->qp = NULL;
 910
 911         if (ipoib_transport_dev_init(dev, ca)) {
 912                 printk(KERN_WARNING "%s: ipoib_transport_dev_init failed\n", ca->name);
 913                 return -ENODEV;
 914         }
 915
 916         setup_timer(&priv->poll_timer, ipoib_ib_tx_timer_func,
 917                     (unsigned long) dev);
 918
 919         if (dev->flags & IFF_UP) {
 920                 if (ipoib_ib_dev_open(dev)) {
 921                         ipoib_transport_dev_cleanup(dev);
 922                         return -ENODEV;
 923                 }
 924         }
 925
 926         return 0;
 927 }
 928
 929 static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv,
 930                                 enum ipoib_flush_level level)
 931 {
 932         struct ipoib_dev_priv *cpriv;
 933         struct net_device *dev = priv->dev;
 934         u16 new_index;
 935
 936         mutex_lock(&priv->vlan_mutex);
 937
 938         /*
 939          * Flush any child interfaces too -- they might be up even if
 940          * the parent is down.
 941          */
 942         list_for_each_entry(cpriv, &priv->child_intfs, list)
 943                 __ipoib_ib_dev_flush(cpriv, level);
 944
 945         mutex_unlock(&priv->vlan_mutex);
 946
 947         if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) {
 948                 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n");
 949                 return;
 950         }
 951
 952         if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
 953                 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n");
 954                 return;
 955         }
 956
 957         if (level == IPOIB_FLUSH_HEAVY) {
 958                 if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &new_index)) {
 959                         clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 960                         ipoib_ib_dev_down(dev, 0);
 961                         ipoib_ib_dev_stop(dev, 0);
 962                         if (ipoib_pkey_dev_delay_open(dev))
 963                                 return;
 964                 }
 965
 966                 /* restart QP only if P_Key index is changed */
 967                 if (test_and_set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags) &&
 968                     new_index == priv->pkey_index) {
 969                         ipoib_dbg(priv, "Not flushing - P_Key index not changed.\n");
 970                         return;
 971                 }
 972                 priv->pkey_index = new_index;
 973         }
 974
 975         if (level == IPOIB_FLUSH_LIGHT) {
 976                 ipoib_mark_paths_invalid(dev);
 977                 ipoib_mcast_dev_flush(dev);
 978         }
 979
 980         if (level >= IPOIB_FLUSH_NORMAL)
 981                 ipoib_ib_dev_down(dev, 0);
 982
 983         if (level == IPOIB_FLUSH_HEAVY) {
 984                 ipoib_ib_dev_stop(dev, 0);
 985                 ipoib_ib_dev_open(dev);
 986         }
 987
 988         /*
 989          * The device could have been brought down between the start and when
 990          * we get here, don't bring it back up if it's not configured up
 991          */
 992         if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
 993                 if (level >= IPOIB_FLUSH_NORMAL)
 994                         ipoib_ib_dev_up(dev);
 995                 ipoib_mcast_restart_task(&priv->restart_task);
 996         }
 997 }
 998
 999 void ipoib_ib_dev_flush_light(struct work_struct *work)
1000 {
1001         struct ipoib_dev_priv *priv =
1002                 container_of(work, struct ipoib_dev_priv, flush_light);
1003
1004         __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_LIGHT);
1005 }
1006
1007 void ipoib_ib_dev_flush_normal(struct work_struct *work)
1008 {
1009         struct ipoib_dev_priv *priv =
1010                 container_of(work, struct ipoib_dev_priv, flush_normal);
1011
1012         __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_NORMAL);
1013 }
1014
1015 void ipoib_ib_dev_flush_heavy(struct work_struct *work)
1016 {
1017         struct ipoib_dev_priv *priv =
1018                 container_of(work, struct ipoib_dev_priv, flush_heavy);
1019
1020         __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_HEAVY);
1021 }
1022
1023 void ipoib_ib_dev_cleanup(struct net_device *dev)
1024 {
1025         struct ipoib_dev_priv *priv = netdev_priv(dev);
1026
1027         ipoib_dbg(priv, "cleaning up ib_dev\n");
1028
1029         ipoib_mcast_stop_thread(dev, 1);
1030         ipoib_mcast_dev_flush(dev);
1031
1032         ipoib_transport_dev_cleanup(dev);
1033 }
1034
1035 /*
1036  * Delayed P_Key Assigment Interim Support
1037  *
1038  * The following is initial implementation of delayed P_Key assigment
1039  * mechanism. It is using the same approach implemented for the multicast
1040  * group join. The single goal of this implementation is to quickly address
1041  * Bug #2507. This implementation will probably be removed when the P_Key
1042  * change async notification is available.
1043  */
1044
1045 void ipoib_pkey_poll(struct work_struct *work)
1046 {
1047         struct ipoib_dev_priv *priv =
1048                 container_of(work, struct ipoib_dev_priv, pkey_poll_task.work);
1049         struct net_device *dev = priv->dev;
1050
1051         ipoib_pkey_dev_check_presence(dev);
1052
1053         if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags))
1054                 ipoib_open(dev);
1055         else {
1056                 mutex_lock(&pkey_mutex);
1057                 if (!test_bit(IPOIB_PKEY_STOP, &priv->flags))
1058                         queue_delayed_work(ipoib_workqueue,
1059                                            &priv->pkey_poll_task,
1060                                            HZ);
1061                 mutex_unlock(&pkey_mutex);
1062         }
1063 }
1064
1065 int ipoib_pkey_dev_delay_open(struct net_device *dev)
1066 {
1067         struct ipoib_dev_priv *priv = netdev_priv(dev);
1068
1069         /* Look for the interface pkey value in the IB Port P_Key table and */
1070         /* set the interface pkey assigment flag                            */
1071         ipoib_pkey_dev_check_presence(dev);
1072
1073         /* P_Key value not assigned yet - start polling */
1074         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
1075                 mutex_lock(&pkey_mutex);
1076                 clear_bit(IPOIB_PKEY_STOP, &priv->flags);
1077                 queue_delayed_work(ipoib_workqueue,
1078                                    &priv->pkey_poll_task,
1079                                    HZ);
1080                 mutex_unlock(&pkey_mutex);
1081                 return 1;
1082         }
1083
1084         return 0;
1085 }