Pileus Git - ~andy/linux/blob - drivers/infiniband/ulp/ipoib/ipoib_ib.c

   1 /*
   2  * Copyright (c) 2004, 2005 Topspin Communications.  All rights reserved.
   3  * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
   4  * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
   5  * Copyright (c) 2004, 2005 Voltaire, Inc. All rights reserved.
   6  *
   7  * This software is available to you under a choice of one of two
   8  * licenses.  You may choose to be licensed under the terms of the GNU
   9  * General Public License (GPL) Version 2, available from the file
  10  * COPYING in the main directory of this source tree, or the
  11  * OpenIB.org BSD license below:
  12  *
  13  *     Redistribution and use in source and binary forms, with or
  14  *     without modification, are permitted provided that the following
  15  *     conditions are met:
  16  *
  17  *      - Redistributions of source code must retain the above
  18  *        copyright notice, this list of conditions and the following
  19  *        disclaimer.
  20  *
  21  *      - Redistributions in binary form must reproduce the above
  22  *        copyright notice, this list of conditions and the following
  23  *        disclaimer in the documentation and/or other materials
  24  *        provided with the distribution.
  25  *
  26  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  27  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  28  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  29  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  30  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  31  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  32  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  33  * SOFTWARE.
  34  */
  35
  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 += PAGE_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         int tailroom;
 160         u64 *mapping;
 161
 162         if (ipoib_ud_need_sg(priv->max_ib_mtu)) {
 163                 buf_size = IPOIB_UD_HEAD_SIZE;
 164                 tailroom = 128; /* reserve some tailroom for IP/TCP headers */
 165         } else {
 166                 buf_size = IPOIB_UD_BUF_SIZE(priv->max_ib_mtu);
 167                 tailroom = 0;
 168         }
 169
 170         skb = dev_alloc_skb(buf_size + tailroom + 4);
 171         if (unlikely(!skb))
 172                 return NULL;
 173
 174         /*
 175          * IB will leave a 40 byte gap for a GRH and IPoIB adds a 4 byte
 176          * header.  So we need 4 more bytes to get to 48 and align the
 177          * IP header to a multiple of 16.
 178          */
 179         skb_reserve(skb, 4);
 180
 181         mapping = priv->rx_ring[id].mapping;
 182         mapping[0] = ib_dma_map_single(priv->ca, skb->data, buf_size,
 183                                        DMA_FROM_DEVICE);
 184         if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0])))
 185                 goto error;
 186
 187         if (ipoib_ud_need_sg(priv->max_ib_mtu)) {
 188                 struct page *page = alloc_page(GFP_ATOMIC);
 189                 if (!page)
 190                         goto partial_error;
 191                 skb_fill_page_desc(skb, 0, page, 0, PAGE_SIZE);
 192                 mapping[1] =
 193                         ib_dma_map_page(priv->ca, page,
 194                                         0, PAGE_SIZE, DMA_FROM_DEVICE);
 195                 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[1])))
 196                         goto partial_error;
 197         }
 198
 199         priv->rx_ring[id].skb = skb;
 200         return skb;
 201
 202 partial_error:
 203         ib_dma_unmap_single(priv->ca, mapping[0], buf_size, DMA_FROM_DEVICE);
 204 error:
 205         dev_kfree_skb_any(skb);
 206         return NULL;
 207 }
 208
 209 static int ipoib_ib_post_receives(struct net_device *dev)
 210 {
 211         struct ipoib_dev_priv *priv = netdev_priv(dev);
 212         int i;
 213
 214         for (i = 0; i < ipoib_recvq_size; ++i) {
 215                 if (!ipoib_alloc_rx_skb(dev, i)) {
 216                         ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
 217                         return -ENOMEM;
 218                 }
 219                 if (ipoib_ib_post_receive(dev, i)) {
 220                         ipoib_warn(priv, "ipoib_ib_post_receive failed for buf %d\n", i);
 221                         return -EIO;
 222                 }
 223         }
 224
 225         return 0;
 226 }
 227
 228 static void ipoib_ib_handle_rx_wc(struct net_device *dev, struct ib_wc *wc)
 229 {
 230         struct ipoib_dev_priv *priv = netdev_priv(dev);
 231         unsigned int wr_id = wc->wr_id & ~IPOIB_OP_RECV;
 232         struct sk_buff *skb;
 233         u64 mapping[IPOIB_UD_RX_SG];
 234         union ib_gid *dgid;
 235
 236         ipoib_dbg_data(priv, "recv completion: id %d, status: %d\n",
 237                        wr_id, wc->status);
 238
 239         if (unlikely(wr_id >= ipoib_recvq_size)) {
 240                 ipoib_warn(priv, "recv completion event with wrid %d (> %d)\n",
 241                            wr_id, ipoib_recvq_size);
 242                 return;
 243         }
 244
 245         skb  = priv->rx_ring[wr_id].skb;
 246
 247         if (unlikely(wc->status != IB_WC_SUCCESS)) {
 248                 if (wc->status != IB_WC_WR_FLUSH_ERR)
 249                         ipoib_warn(priv, "failed recv event "
 250                                    "(status=%d, wrid=%d vend_err %x)\n",
 251                                    wc->status, wr_id, wc->vendor_err);
 252                 ipoib_ud_dma_unmap_rx(priv, priv->rx_ring[wr_id].mapping);
 253                 dev_kfree_skb_any(skb);
 254                 priv->rx_ring[wr_id].skb = NULL;
 255                 return;
 256         }
 257
 258         /*
 259          * Drop packets that this interface sent, ie multicast packets
 260          * that the HCA has replicated.
 261          */
 262         if (wc->slid == priv->local_lid && wc->src_qp == priv->qp->qp_num)
 263                 goto repost;
 264
 265         memcpy(mapping, priv->rx_ring[wr_id].mapping,
 266                IPOIB_UD_RX_SG * sizeof *mapping);
 267
 268         /*
 269          * If we can't allocate a new RX buffer, dump
 270          * this packet and reuse the old buffer.
 271          */
 272         if (unlikely(!ipoib_alloc_rx_skb(dev, wr_id))) {
 273                 ++dev->stats.rx_dropped;
 274                 goto repost;
 275         }
 276
 277         ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
 278                        wc->byte_len, wc->slid);
 279
 280         ipoib_ud_dma_unmap_rx(priv, mapping);
 281         ipoib_ud_skb_put_frags(priv, skb, wc->byte_len);
 282
 283         /* First byte of dgid signals multicast when 0xff */
 284         dgid = &((struct ib_grh *)skb->data)->dgid;
 285
 286         if (!(wc->wc_flags & IB_WC_GRH) || dgid->raw[0] != 0xff)
 287                 skb->pkt_type = PACKET_HOST;
 288         else if (memcmp(dgid, dev->broadcast + 4, sizeof(union ib_gid)) == 0)
 289                 skb->pkt_type = PACKET_BROADCAST;
 290         else
 291                 skb->pkt_type = PACKET_MULTICAST;
 292
 293         skb_pull(skb, IB_GRH_BYTES);
 294
 295         skb->protocol = ((struct ipoib_header *) skb->data)->proto;
 296         skb_reset_mac_header(skb);
 297         skb_pull(skb, IPOIB_ENCAP_LEN);
 298
 299         ++dev->stats.rx_packets;
 300         dev->stats.rx_bytes += skb->len;
 301
 302         skb->dev = dev;
 303         if ((dev->features & NETIF_F_RXCSUM) &&
 304                         likely(wc->wc_flags & IB_WC_IP_CSUM_OK))
 305                 skb->ip_summed = CHECKSUM_UNNECESSARY;
 306
 307         napi_gro_receive(&priv->napi, skb);
 308
 309 repost:
 310         if (unlikely(ipoib_ib_post_receive(dev, wr_id)))
 311                 ipoib_warn(priv, "ipoib_ib_post_receive failed "
 312                            "for buf %d\n", wr_id);
 313 }
 314
 315 static int ipoib_dma_map_tx(struct ib_device *ca,
 316                             struct ipoib_tx_buf *tx_req)
 317 {
 318         struct sk_buff *skb = tx_req->skb;
 319         u64 *mapping = tx_req->mapping;
 320         int i;
 321         int off;
 322
 323         if (skb_headlen(skb)) {
 324                 mapping[0] = ib_dma_map_single(ca, skb->data, skb_headlen(skb),
 325                                                DMA_TO_DEVICE);
 326                 if (unlikely(ib_dma_mapping_error(ca, mapping[0])))
 327                         return -EIO;
 328
 329                 off = 1;
 330         } else
 331                 off = 0;
 332
 333         for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) {
 334                 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 335                 mapping[i + off] = ib_dma_map_page(ca,
 336                                                  skb_frag_page(frag),
 337                                                  frag->page_offset, skb_frag_size(frag),
 338                                                  DMA_TO_DEVICE);
 339                 if (unlikely(ib_dma_mapping_error(ca, mapping[i + off])))
 340                         goto partial_error;
 341         }
 342         return 0;
 343
 344 partial_error:
 345         for (; i > 0; --i) {
 346                 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i - 1];
 347
 348                 ib_dma_unmap_page(ca, mapping[i - !off], skb_frag_size(frag), DMA_TO_DEVICE);
 349         }
 350
 351         if (off)
 352                 ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE);
 353
 354         return -EIO;
 355 }
 356
 357 static void ipoib_dma_unmap_tx(struct ib_device *ca,
 358                                struct ipoib_tx_buf *tx_req)
 359 {
 360         struct sk_buff *skb = tx_req->skb;
 361         u64 *mapping = tx_req->mapping;
 362         int i;
 363         int off;
 364
 365         if (skb_headlen(skb)) {
 366                 ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE);
 367                 off = 1;
 368         } else
 369                 off = 0;
 370
 371         for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) {
 372                 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 373
 374                 ib_dma_unmap_page(ca, mapping[i + off], skb_frag_size(frag),
 375                                   DMA_TO_DEVICE);
 376         }
 377 }
 378
 379 static void ipoib_ib_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
 380 {
 381         struct ipoib_dev_priv *priv = netdev_priv(dev);
 382         unsigned int wr_id = wc->wr_id;
 383         struct ipoib_tx_buf *tx_req;
 384
 385         ipoib_dbg_data(priv, "send completion: id %d, status: %d\n",
 386                        wr_id, wc->status);
 387
 388         if (unlikely(wr_id >= ipoib_sendq_size)) {
 389                 ipoib_warn(priv, "send completion event with wrid %d (> %d)\n",
 390                            wr_id, ipoib_sendq_size);
 391                 return;
 392         }
 393
 394         tx_req = &priv->tx_ring[wr_id];
 395
 396         ipoib_dma_unmap_tx(priv->ca, tx_req);
 397
 398         ++dev->stats.tx_packets;
 399         dev->stats.tx_bytes += tx_req->skb->len;
 400
 401         dev_kfree_skb_any(tx_req->skb);
 402
 403         ++priv->tx_tail;
 404         if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
 405             netif_queue_stopped(dev) &&
 406             test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
 407                 netif_wake_queue(dev);
 408
 409         if (wc->status != IB_WC_SUCCESS &&
 410             wc->status != IB_WC_WR_FLUSH_ERR)
 411                 ipoib_warn(priv, "failed send event "
 412                            "(status=%d, wrid=%d vend_err %x)\n",
 413                            wc->status, wr_id, wc->vendor_err);
 414 }
 415
 416 static int poll_tx(struct ipoib_dev_priv *priv)
 417 {
 418         int n, i;
 419
 420         n = ib_poll_cq(priv->send_cq, MAX_SEND_CQE, priv->send_wc);
 421         for (i = 0; i < n; ++i)
 422                 ipoib_ib_handle_tx_wc(priv->dev, priv->send_wc + i);
 423
 424         return n == MAX_SEND_CQE;
 425 }
 426
 427 int ipoib_poll(struct napi_struct *napi, int budget)
 428 {
 429         struct ipoib_dev_priv *priv = container_of(napi, struct ipoib_dev_priv, napi);
 430         struct net_device *dev = priv->dev;
 431         int done;
 432         int t;
 433         int n, i;
 434
 435         done  = 0;
 436
 437 poll_more:
 438         while (done < budget) {
 439                 int max = (budget - done);
 440
 441                 t = min(IPOIB_NUM_WC, max);
 442                 n = ib_poll_cq(priv->recv_cq, t, priv->ibwc);
 443
 444                 for (i = 0; i < n; i++) {
 445                         struct ib_wc *wc = priv->ibwc + i;
 446
 447                         if (wc->wr_id & IPOIB_OP_RECV) {
 448                                 ++done;
 449                                 if (wc->wr_id & IPOIB_OP_CM)
 450                                         ipoib_cm_handle_rx_wc(dev, wc);
 451                                 else
 452                                         ipoib_ib_handle_rx_wc(dev, wc);
 453                         } else
 454                                 ipoib_cm_handle_tx_wc(priv->dev, wc);
 455                 }
 456
 457                 if (n != t)
 458                         break;
 459         }
 460
 461         if (done < budget) {
 462                 napi_complete(napi);
 463                 if (unlikely(ib_req_notify_cq(priv->recv_cq,
 464                                               IB_CQ_NEXT_COMP |
 465                                               IB_CQ_REPORT_MISSED_EVENTS)) &&
 466                     napi_reschedule(napi))
 467                         goto poll_more;
 468         }
 469
 470         return done;
 471 }
 472
 473 void ipoib_ib_completion(struct ib_cq *cq, void *dev_ptr)
 474 {
 475         struct net_device *dev = dev_ptr;
 476         struct ipoib_dev_priv *priv = netdev_priv(dev);
 477
 478         napi_schedule(&priv->napi);
 479 }
 480
 481 static void drain_tx_cq(struct net_device *dev)
 482 {
 483         struct ipoib_dev_priv *priv = netdev_priv(dev);
 484
 485         netif_tx_lock(dev);
 486         while (poll_tx(priv))
 487                 ; /* nothing */
 488
 489         if (netif_queue_stopped(dev))
 490                 mod_timer(&priv->poll_timer, jiffies + 1);
 491
 492         netif_tx_unlock(dev);
 493 }
 494
 495 void ipoib_send_comp_handler(struct ib_cq *cq, void *dev_ptr)
 496 {
 497         struct ipoib_dev_priv *priv = netdev_priv(dev_ptr);
 498
 499         mod_timer(&priv->poll_timer, jiffies);
 500 }
 501
 502 static inline int post_send(struct ipoib_dev_priv *priv,
 503                             unsigned int wr_id,
 504                             struct ib_ah *address, u32 qpn,
 505                             struct ipoib_tx_buf *tx_req,
 506                             void *head, int hlen)
 507 {
 508         struct ib_send_wr *bad_wr;
 509         int i, off;
 510         struct sk_buff *skb = tx_req->skb;
 511         skb_frag_t *frags = skb_shinfo(skb)->frags;
 512         int nr_frags = skb_shinfo(skb)->nr_frags;
 513         u64 *mapping = tx_req->mapping;
 514
 515         if (skb_headlen(skb)) {
 516                 priv->tx_sge[0].addr         = mapping[0];
 517                 priv->tx_sge[0].length       = skb_headlen(skb);
 518                 off = 1;
 519         } else
 520                 off = 0;
 521
 522         for (i = 0; i < nr_frags; ++i) {
 523                 priv->tx_sge[i + off].addr = mapping[i + off];
 524                 priv->tx_sge[i + off].length = skb_frag_size(&frags[i]);
 525         }
 526         priv->tx_wr.num_sge          = nr_frags + off;
 527         priv->tx_wr.wr_id            = wr_id;
 528         priv->tx_wr.wr.ud.remote_qpn = qpn;
 529         priv->tx_wr.wr.ud.ah         = address;
 530
 531         if (head) {
 532                 priv->tx_wr.wr.ud.mss    = skb_shinfo(skb)->gso_size;
 533                 priv->tx_wr.wr.ud.header = head;
 534                 priv->tx_wr.wr.ud.hlen   = hlen;
 535                 priv->tx_wr.opcode       = IB_WR_LSO;
 536         } else
 537                 priv->tx_wr.opcode       = IB_WR_SEND;
 538
 539         return ib_post_send(priv->qp, &priv->tx_wr, &bad_wr);
 540 }
 541
 542 void ipoib_send(struct net_device *dev, struct sk_buff *skb,
 543                 struct ipoib_ah *address, u32 qpn)
 544 {
 545         struct ipoib_dev_priv *priv = netdev_priv(dev);
 546         struct ipoib_tx_buf *tx_req;
 547         int hlen, rc;
 548         void *phead;
 549
 550         if (skb_is_gso(skb)) {
 551                 hlen = skb_transport_offset(skb) + tcp_hdrlen(skb);
 552                 phead = skb->data;
 553                 if (unlikely(!skb_pull(skb, hlen))) {
 554                         ipoib_warn(priv, "linear data too small\n");
 555                         ++dev->stats.tx_dropped;
 556                         ++dev->stats.tx_errors;
 557                         dev_kfree_skb_any(skb);
 558                         return;
 559                 }
 560         } else {
 561                 if (unlikely(skb->len > priv->mcast_mtu + IPOIB_ENCAP_LEN)) {
 562                         ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
 563                                    skb->len, priv->mcast_mtu + IPOIB_ENCAP_LEN);
 564                         ++dev->stats.tx_dropped;
 565                         ++dev->stats.tx_errors;
 566                         ipoib_cm_skb_too_long(dev, skb, priv->mcast_mtu);
 567                         return;
 568                 }
 569                 phead = NULL;
 570                 hlen  = 0;
 571         }
 572
 573         ipoib_dbg_data(priv, "sending packet, length=%d address=%p qpn=0x%06x\n",
 574                        skb->len, address, qpn);
 575
 576         /*
 577          * We put the skb into the tx_ring _before_ we call post_send()
 578          * because it's entirely possible that the completion handler will
 579          * run before we execute anything after the post_send().  That
 580          * means we have to make sure everything is properly recorded and
 581          * our state is consistent before we call post_send().
 582          */
 583         tx_req = &priv->tx_ring[priv->tx_head & (ipoib_sendq_size - 1)];
 584         tx_req->skb = skb;
 585         if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req))) {
 586                 ++dev->stats.tx_errors;
 587                 dev_kfree_skb_any(skb);
 588                 return;
 589         }
 590
 591         if (skb->ip_summed == CHECKSUM_PARTIAL)
 592                 priv->tx_wr.send_flags |= IB_SEND_IP_CSUM;
 593         else
 594                 priv->tx_wr.send_flags &= ~IB_SEND_IP_CSUM;
 595
 596         if (++priv->tx_outstanding == ipoib_sendq_size) {
 597                 ipoib_dbg(priv, "TX ring full, stopping kernel net queue\n");
 598                 if (ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP))
 599                         ipoib_warn(priv, "request notify on send CQ failed\n");
 600                 netif_stop_queue(dev);
 601         }
 602
 603         rc = post_send(priv, priv->tx_head & (ipoib_sendq_size - 1),
 604                        address->ah, qpn, tx_req, phead, hlen);
 605         if (unlikely(rc)) {
 606                 ipoib_warn(priv, "post_send failed, error %d\n", rc);
 607                 ++dev->stats.tx_errors;
 608                 --priv->tx_outstanding;
 609                 ipoib_dma_unmap_tx(priv->ca, tx_req);
 610                 dev_kfree_skb_any(skb);
 611                 if (netif_queue_stopped(dev))
 612                         netif_wake_queue(dev);
 613         } else {
 614                 dev->trans_start = jiffies;
 615
 616                 address->last_send = priv->tx_head;
 617                 ++priv->tx_head;
 618                 skb_orphan(skb);
 619
 620         }
 621
 622         if (unlikely(priv->tx_outstanding > MAX_SEND_CQE))
 623                 while (poll_tx(priv))
 624                         ; /* nothing */
 625 }
 626
 627 static void __ipoib_reap_ah(struct net_device *dev)
 628 {
 629         struct ipoib_dev_priv *priv = netdev_priv(dev);
 630         struct ipoib_ah *ah, *tah;
 631         LIST_HEAD(remove_list);
 632         unsigned long flags;
 633
 634         netif_tx_lock_bh(dev);
 635         spin_lock_irqsave(&priv->lock, flags);
 636
 637         list_for_each_entry_safe(ah, tah, &priv->dead_ahs, list)
 638                 if ((int) priv->tx_tail - (int) ah->last_send >= 0) {
 639                         list_del(&ah->list);
 640                         ib_destroy_ah(ah->ah);
 641                         kfree(ah);
 642                 }
 643
 644         spin_unlock_irqrestore(&priv->lock, flags);
 645         netif_tx_unlock_bh(dev);
 646 }
 647
 648 void ipoib_reap_ah(struct work_struct *work)
 649 {
 650         struct ipoib_dev_priv *priv =
 651                 container_of(work, struct ipoib_dev_priv, ah_reap_task.work);
 652         struct net_device *dev = priv->dev;
 653
 654         __ipoib_reap_ah(dev);
 655
 656         if (!test_bit(IPOIB_STOP_REAPER, &priv->flags))
 657                 queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task,
 658                                    round_jiffies_relative(HZ));
 659 }
 660
 661 static void ipoib_ib_tx_timer_func(unsigned long ctx)
 662 {
 663         drain_tx_cq((struct net_device *)ctx);
 664 }
 665
 666 int ipoib_ib_dev_open(struct net_device *dev)
 667 {
 668         struct ipoib_dev_priv *priv = netdev_priv(dev);
 669         int ret;
 670
 671         if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &priv->pkey_index)) {
 672                 ipoib_warn(priv, "P_Key 0x%04x not found\n", priv->pkey);
 673                 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 674                 return -1;
 675         }
 676         set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 677
 678         ret = ipoib_init_qp(dev);
 679         if (ret) {
 680                 ipoib_warn(priv, "ipoib_init_qp returned %d\n", ret);
 681                 return -1;
 682         }
 683
 684         ret = ipoib_ib_post_receives(dev);
 685         if (ret) {
 686                 ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret);
 687                 ipoib_ib_dev_stop(dev, 1);
 688                 return -1;
 689         }
 690
 691         ret = ipoib_cm_dev_open(dev);
 692         if (ret) {
 693                 ipoib_warn(priv, "ipoib_cm_dev_open returned %d\n", ret);
 694                 ipoib_ib_dev_stop(dev, 1);
 695                 return -1;
 696         }
 697
 698         clear_bit(IPOIB_STOP_REAPER, &priv->flags);
 699         queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task,
 700                            round_jiffies_relative(HZ));
 701
 702         if (!test_and_set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
 703                 napi_enable(&priv->napi);
 704
 705         return 0;
 706 }
 707
 708 static void ipoib_pkey_dev_check_presence(struct net_device *dev)
 709 {
 710         struct ipoib_dev_priv *priv = netdev_priv(dev);
 711         u16 pkey_index = 0;
 712
 713         if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &pkey_index))
 714                 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 715         else
 716                 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 717 }
 718
 719 int ipoib_ib_dev_up(struct net_device *dev)
 720 {
 721         struct ipoib_dev_priv *priv = netdev_priv(dev);
 722
 723         ipoib_pkey_dev_check_presence(dev);
 724
 725         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
 726                 ipoib_dbg(priv, "PKEY is not assigned.\n");
 727                 return 0;
 728         }
 729
 730         set_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
 731
 732         return ipoib_mcast_start_thread(dev);
 733 }
 734
 735 int ipoib_ib_dev_down(struct net_device *dev, int flush)
 736 {
 737         struct ipoib_dev_priv *priv = netdev_priv(dev);
 738
 739         ipoib_dbg(priv, "downing ib_dev\n");
 740
 741         clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
 742         netif_carrier_off(dev);
 743
 744         /* Shutdown the P_Key thread if still active */
 745         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
 746                 mutex_lock(&pkey_mutex);
 747                 set_bit(IPOIB_PKEY_STOP, &priv->flags);
 748                 cancel_delayed_work(&priv->pkey_poll_task);
 749                 mutex_unlock(&pkey_mutex);
 750                 if (flush)
 751                         flush_workqueue(ipoib_workqueue);
 752         }
 753
 754         ipoib_mcast_stop_thread(dev, flush);
 755         ipoib_mcast_dev_flush(dev);
 756
 757         ipoib_flush_paths(dev);
 758
 759         return 0;
 760 }
 761
 762 static int recvs_pending(struct net_device *dev)
 763 {
 764         struct ipoib_dev_priv *priv = netdev_priv(dev);
 765         int pending = 0;
 766         int i;
 767
 768         for (i = 0; i < ipoib_recvq_size; ++i)
 769                 if (priv->rx_ring[i].skb)
 770                         ++pending;
 771
 772         return pending;
 773 }
 774
 775 void ipoib_drain_cq(struct net_device *dev)
 776 {
 777         struct ipoib_dev_priv *priv = netdev_priv(dev);
 778         int i, n;
 779
 780         /*
 781          * We call completion handling routines that expect to be
 782          * called from the BH-disabled NAPI poll context, so disable
 783          * BHs here too.
 784          */
 785         local_bh_disable();
 786
 787         do {
 788                 n = ib_poll_cq(priv->recv_cq, IPOIB_NUM_WC, priv->ibwc);
 789                 for (i = 0; i < n; ++i) {
 790                         /*
 791                          * Convert any successful completions to flush
 792                          * errors to avoid passing packets up the
 793                          * stack after bringing the device down.
 794                          */
 795                         if (priv->ibwc[i].status == IB_WC_SUCCESS)
 796                                 priv->ibwc[i].status = IB_WC_WR_FLUSH_ERR;
 797
 798                         if (priv->ibwc[i].wr_id & IPOIB_OP_RECV) {
 799                                 if (priv->ibwc[i].wr_id & IPOIB_OP_CM)
 800                                         ipoib_cm_handle_rx_wc(dev, priv->ibwc + i);
 801                                 else
 802                                         ipoib_ib_handle_rx_wc(dev, priv->ibwc + i);
 803                         } else
 804                                 ipoib_cm_handle_tx_wc(dev, priv->ibwc + i);
 805                 }
 806         } while (n == IPOIB_NUM_WC);
 807
 808         while (poll_tx(priv))
 809                 ; /* nothing */
 810
 811         local_bh_enable();
 812 }
 813
 814 int ipoib_ib_dev_stop(struct net_device *dev, int flush)
 815 {
 816         struct ipoib_dev_priv *priv = netdev_priv(dev);
 817         struct ib_qp_attr qp_attr;
 818         unsigned long begin;
 819         struct ipoib_tx_buf *tx_req;
 820         int i;
 821
 822         if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
 823                 napi_disable(&priv->napi);
 824
 825         ipoib_cm_dev_stop(dev);
 826
 827         /*
 828          * Move our QP to the error state and then reinitialize in
 829          * when all work requests have completed or have been flushed.
 830          */
 831         qp_attr.qp_state = IB_QPS_ERR;
 832         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
 833                 ipoib_warn(priv, "Failed to modify QP to ERROR state\n");
 834
 835         /* Wait for all sends and receives to complete */
 836         begin = jiffies;
 837
 838         while (priv->tx_head != priv->tx_tail || recvs_pending(dev)) {
 839                 if (time_after(jiffies, begin + 5 * HZ)) {
 840                         ipoib_warn(priv, "timing out; %d sends %d receives not completed\n",
 841                                    priv->tx_head - priv->tx_tail, recvs_pending(dev));
 842
 843                         /*
 844                          * assume the HW is wedged and just free up
 845                          * all our pending work requests.
 846                          */
 847                         while ((int) priv->tx_tail - (int) priv->tx_head < 0) {
 848                                 tx_req = &priv->tx_ring[priv->tx_tail &
 849                                                         (ipoib_sendq_size - 1)];
 850                                 ipoib_dma_unmap_tx(priv->ca, tx_req);
 851                                 dev_kfree_skb_any(tx_req->skb);
 852                                 ++priv->tx_tail;
 853                                 --priv->tx_outstanding;
 854                         }
 855
 856                         for (i = 0; i < ipoib_recvq_size; ++i) {
 857                                 struct ipoib_rx_buf *rx_req;
 858
 859                                 rx_req = &priv->rx_ring[i];
 860                                 if (!rx_req->skb)
 861                                         continue;
 862                                 ipoib_ud_dma_unmap_rx(priv,
 863                                                       priv->rx_ring[i].mapping);
 864                                 dev_kfree_skb_any(rx_req->skb);
 865                                 rx_req->skb = NULL;
 866                         }
 867
 868                         goto timeout;
 869                 }
 870
 871                 ipoib_drain_cq(dev);
 872
 873                 msleep(1);
 874         }
 875
 876         ipoib_dbg(priv, "All sends and receives done.\n");
 877
 878 timeout:
 879         del_timer_sync(&priv->poll_timer);
 880         qp_attr.qp_state = IB_QPS_RESET;
 881         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
 882                 ipoib_warn(priv, "Failed to modify QP to RESET state\n");
 883
 884         /* Wait for all AHs to be reaped */
 885         set_bit(IPOIB_STOP_REAPER, &priv->flags);
 886         cancel_delayed_work(&priv->ah_reap_task);
 887         if (flush)
 888                 flush_workqueue(ipoib_workqueue);
 889
 890         begin = jiffies;
 891
 892         while (!list_empty(&priv->dead_ahs)) {
 893                 __ipoib_reap_ah(dev);
 894
 895                 if (time_after(jiffies, begin + HZ)) {
 896                         ipoib_warn(priv, "timing out; will leak address handles\n");
 897                         break;
 898                 }
 899
 900                 msleep(1);
 901         }
 902
 903         ib_req_notify_cq(priv->recv_cq, IB_CQ_NEXT_COMP);
 904
 905         return 0;
 906 }
 907
 908 int ipoib_ib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
 909 {
 910         struct ipoib_dev_priv *priv = netdev_priv(dev);
 911
 912         priv->ca = ca;
 913         priv->port = port;
 914         priv->qp = NULL;
 915
 916         if (ipoib_transport_dev_init(dev, ca)) {
 917                 printk(KERN_WARNING "%s: ipoib_transport_dev_init failed\n", ca->name);
 918                 return -ENODEV;
 919         }
 920
 921         setup_timer(&priv->poll_timer, ipoib_ib_tx_timer_func,
 922                     (unsigned long) dev);
 923
 924         if (dev->flags & IFF_UP) {
 925                 if (ipoib_ib_dev_open(dev)) {
 926                         ipoib_transport_dev_cleanup(dev);
 927                         return -ENODEV;
 928                 }
 929         }
 930
 931         return 0;
 932 }
 933
 934 static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv,
 935                                 enum ipoib_flush_level level)
 936 {
 937         struct ipoib_dev_priv *cpriv;
 938         struct net_device *dev = priv->dev;
 939         u16 new_index;
 940
 941         mutex_lock(&priv->vlan_mutex);
 942
 943         /*
 944          * Flush any child interfaces too -- they might be up even if
 945          * the parent is down.
 946          */
 947         list_for_each_entry(cpriv, &priv->child_intfs, list)
 948                 __ipoib_ib_dev_flush(cpriv, level);
 949
 950         mutex_unlock(&priv->vlan_mutex);
 951
 952         if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) {
 953                 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n");
 954                 return;
 955         }
 956
 957         if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
 958                 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n");
 959                 return;
 960         }
 961
 962         if (level == IPOIB_FLUSH_HEAVY) {
 963                 if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &new_index)) {
 964                         clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 965                         ipoib_ib_dev_down(dev, 0);
 966                         ipoib_ib_dev_stop(dev, 0);
 967                         if (ipoib_pkey_dev_delay_open(dev))
 968                                 return;
 969                 }
 970
 971                 /* restart QP only if P_Key index is changed */
 972                 if (test_and_set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags) &&
 973                     new_index == priv->pkey_index) {
 974                         ipoib_dbg(priv, "Not flushing - P_Key index not changed.\n");
 975                         return;
 976                 }
 977                 priv->pkey_index = new_index;
 978         }
 979
 980         if (level == IPOIB_FLUSH_LIGHT) {
 981                 ipoib_mark_paths_invalid(dev);
 982                 ipoib_mcast_dev_flush(dev);
 983         }
 984
 985         if (level >= IPOIB_FLUSH_NORMAL)
 986                 ipoib_ib_dev_down(dev, 0);
 987
 988         if (level == IPOIB_FLUSH_HEAVY) {
 989                 ipoib_ib_dev_stop(dev, 0);
 990                 ipoib_ib_dev_open(dev);
 991         }
 992
 993         /*
 994          * The device could have been brought down between the start and when
 995          * we get here, don't bring it back up if it's not configured up
 996          */
 997         if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
 998                 if (level >= IPOIB_FLUSH_NORMAL)
 999                         ipoib_ib_dev_up(dev);
1000                 ipoib_mcast_restart_task(&priv->restart_task);
1001         }
1002 }
1003
1004 void ipoib_ib_dev_flush_light(struct work_struct *work)
1005 {
1006         struct ipoib_dev_priv *priv =
1007                 container_of(work, struct ipoib_dev_priv, flush_light);
1008
1009         __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_LIGHT);
1010 }
1011
1012 void ipoib_ib_dev_flush_normal(struct work_struct *work)
1013 {
1014         struct ipoib_dev_priv *priv =
1015                 container_of(work, struct ipoib_dev_priv, flush_normal);
1016
1017         __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_NORMAL);
1018 }
1019
1020 void ipoib_ib_dev_flush_heavy(struct work_struct *work)
1021 {
1022         struct ipoib_dev_priv *priv =
1023                 container_of(work, struct ipoib_dev_priv, flush_heavy);
1024
1025         __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_HEAVY);
1026 }
1027
1028 void ipoib_ib_dev_cleanup(struct net_device *dev)
1029 {
1030         struct ipoib_dev_priv *priv = netdev_priv(dev);
1031
1032         ipoib_dbg(priv, "cleaning up ib_dev\n");
1033
1034         ipoib_mcast_stop_thread(dev, 1);
1035         ipoib_mcast_dev_flush(dev);
1036
1037         ipoib_transport_dev_cleanup(dev);
1038 }
1039
1040 /*
1041  * Delayed P_Key Assigment Interim Support
1042  *
1043  * The following is initial implementation of delayed P_Key assigment
1044  * mechanism. It is using the same approach implemented for the multicast
1045  * group join. The single goal of this implementation is to quickly address
1046  * Bug #2507. This implementation will probably be removed when the P_Key
1047  * change async notification is available.
1048  */
1049
1050 void ipoib_pkey_poll(struct work_struct *work)
1051 {
1052         struct ipoib_dev_priv *priv =
1053                 container_of(work, struct ipoib_dev_priv, pkey_poll_task.work);
1054         struct net_device *dev = priv->dev;
1055
1056         ipoib_pkey_dev_check_presence(dev);
1057
1058         if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags))
1059                 ipoib_open(dev);
1060         else {
1061                 mutex_lock(&pkey_mutex);
1062                 if (!test_bit(IPOIB_PKEY_STOP, &priv->flags))
1063                         queue_delayed_work(ipoib_workqueue,
1064                                            &priv->pkey_poll_task,
1065                                            HZ);
1066                 mutex_unlock(&pkey_mutex);
1067         }
1068 }
1069
1070 int ipoib_pkey_dev_delay_open(struct net_device *dev)
1071 {
1072         struct ipoib_dev_priv *priv = netdev_priv(dev);
1073
1074         /* Look for the interface pkey value in the IB Port P_Key table and */
1075         /* set the interface pkey assigment flag                            */
1076         ipoib_pkey_dev_check_presence(dev);
1077
1078         /* P_Key value not assigned yet - start polling */
1079         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
1080                 mutex_lock(&pkey_mutex);
1081                 clear_bit(IPOIB_PKEY_STOP, &priv->flags);
1082                 queue_delayed_work(ipoib_workqueue,
1083                                    &priv->pkey_poll_task,
1084                                    HZ);
1085                 mutex_unlock(&pkey_mutex);
1086                 return 1;
1087         }
1088
1089         return 0;
1090 }