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         skb_orphan(skb);
 604         skb_dst_drop(skb);
 605
 606         rc = post_send(priv, priv->tx_head & (ipoib_sendq_size - 1),
 607                        address->ah, qpn, tx_req, phead, hlen);
 608         if (unlikely(rc)) {
 609                 ipoib_warn(priv, "post_send failed, error %d\n", rc);
 610                 ++dev->stats.tx_errors;
 611                 --priv->tx_outstanding;
 612                 ipoib_dma_unmap_tx(priv->ca, tx_req);
 613                 dev_kfree_skb_any(skb);
 614                 if (netif_queue_stopped(dev))
 615                         netif_wake_queue(dev);
 616         } else {
 617                 dev->trans_start = jiffies;
 618
 619                 address->last_send = priv->tx_head;
 620                 ++priv->tx_head;
 621         }
 622
 623         if (unlikely(priv->tx_outstanding > MAX_SEND_CQE))
 624                 while (poll_tx(priv))
 625                         ; /* nothing */
 626 }
 627
 628 static void __ipoib_reap_ah(struct net_device *dev)
 629 {
 630         struct ipoib_dev_priv *priv = netdev_priv(dev);
 631         struct ipoib_ah *ah, *tah;
 632         LIST_HEAD(remove_list);
 633         unsigned long flags;
 634
 635         netif_tx_lock_bh(dev);
 636         spin_lock_irqsave(&priv->lock, flags);
 637
 638         list_for_each_entry_safe(ah, tah, &priv->dead_ahs, list)
 639                 if ((int) priv->tx_tail - (int) ah->last_send >= 0) {
 640                         list_del(&ah->list);
 641                         ib_destroy_ah(ah->ah);
 642                         kfree(ah);
 643                 }
 644
 645         spin_unlock_irqrestore(&priv->lock, flags);
 646         netif_tx_unlock_bh(dev);
 647 }
 648
 649 void ipoib_reap_ah(struct work_struct *work)
 650 {
 651         struct ipoib_dev_priv *priv =
 652                 container_of(work, struct ipoib_dev_priv, ah_reap_task.work);
 653         struct net_device *dev = priv->dev;
 654
 655         __ipoib_reap_ah(dev);
 656
 657         if (!test_bit(IPOIB_STOP_REAPER, &priv->flags))
 658                 queue_delayed_work(priv->wq, &priv->ah_reap_task,
 659                                    round_jiffies_relative(HZ));
 660 }
 661
 662 static void ipoib_flush_ah(struct net_device *dev)
 663 {
 664         struct ipoib_dev_priv *priv = netdev_priv(dev);
 665
 666         cancel_delayed_work(&priv->ah_reap_task);
 667         flush_workqueue(priv->wq);
 668         ipoib_reap_ah(&priv->ah_reap_task.work);
 669 }
 670
 671 static void ipoib_stop_ah(struct net_device *dev)
 672 {
 673         struct ipoib_dev_priv *priv = netdev_priv(dev);
 674
 675         set_bit(IPOIB_STOP_REAPER, &priv->flags);
 676         ipoib_flush_ah(dev);
 677 }
 678
 679 static void ipoib_ib_tx_timer_func(unsigned long ctx)
 680 {
 681         drain_tx_cq((struct net_device *)ctx);
 682 }
 683
 684 int ipoib_ib_dev_open(struct net_device *dev)
 685 {
 686         struct ipoib_dev_priv *priv = netdev_priv(dev);
 687         int ret;
 688
 689         ipoib_pkey_dev_check_presence(dev);
 690
 691         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
 692                 ipoib_warn(priv, "P_Key 0x%04x is %s\n", priv->pkey,
 693                            (!(priv->pkey & 0x7fff) ? "Invalid" : "not found"));
 694                 return -1;
 695         }
 696
 697         ret = ipoib_init_qp(dev);
 698         if (ret) {
 699                 ipoib_warn(priv, "ipoib_init_qp returned %d\n", ret);
 700                 return -1;
 701         }
 702
 703         ret = ipoib_ib_post_receives(dev);
 704         if (ret) {
 705                 ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret);
 706                 goto dev_stop;
 707         }
 708
 709         ret = ipoib_cm_dev_open(dev);
 710         if (ret) {
 711                 ipoib_warn(priv, "ipoib_cm_dev_open returned %d\n", ret);
 712                 goto dev_stop;
 713         }
 714
 715         clear_bit(IPOIB_STOP_REAPER, &priv->flags);
 716         queue_delayed_work(priv->wq, &priv->ah_reap_task,
 717                            round_jiffies_relative(HZ));
 718
 719         if (!test_and_set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
 720                 napi_enable(&priv->napi);
 721
 722         return 0;
 723 dev_stop:
 724         if (!test_and_set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
 725                 napi_enable(&priv->napi);
 726         ipoib_ib_dev_stop(dev);
 727         return -1;
 728 }
 729
 730 void ipoib_pkey_dev_check_presence(struct net_device *dev)
 731 {
 732         struct ipoib_dev_priv *priv = netdev_priv(dev);
 733
 734         if (!(priv->pkey & 0x7fff) ||
 735             ib_find_pkey(priv->ca, priv->port, priv->pkey,
 736                          &priv->pkey_index))
 737                 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 738         else
 739                 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 740 }
 741
 742 int ipoib_ib_dev_up(struct net_device *dev)
 743 {
 744         struct ipoib_dev_priv *priv = netdev_priv(dev);
 745
 746         ipoib_pkey_dev_check_presence(dev);
 747
 748         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
 749                 ipoib_dbg(priv, "PKEY is not assigned.\n");
 750                 return 0;
 751         }
 752
 753         set_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
 754
 755         return ipoib_mcast_start_thread(dev);
 756 }
 757
 758 int ipoib_ib_dev_down(struct net_device *dev)
 759 {
 760         struct ipoib_dev_priv *priv = netdev_priv(dev);
 761
 762         ipoib_dbg(priv, "downing ib_dev\n");
 763
 764         clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
 765         netif_carrier_off(dev);
 766
 767         ipoib_mcast_stop_thread(dev);
 768         ipoib_mcast_dev_flush(dev);
 769
 770         ipoib_flush_paths(dev);
 771
 772         return 0;
 773 }
 774
 775 static int recvs_pending(struct net_device *dev)
 776 {
 777         struct ipoib_dev_priv *priv = netdev_priv(dev);
 778         int pending = 0;
 779         int i;
 780
 781         for (i = 0; i < ipoib_recvq_size; ++i)
 782                 if (priv->rx_ring[i].skb)
 783                         ++pending;
 784
 785         return pending;
 786 }
 787
 788 void ipoib_drain_cq(struct net_device *dev)
 789 {
 790         struct ipoib_dev_priv *priv = netdev_priv(dev);
 791         int i, n;
 792
 793         /*
 794          * We call completion handling routines that expect to be
 795          * called from the BH-disabled NAPI poll context, so disable
 796          * BHs here too.
 797          */
 798         local_bh_disable();
 799
 800         do {
 801                 n = ib_poll_cq(priv->recv_cq, IPOIB_NUM_WC, priv->ibwc);
 802                 for (i = 0; i < n; ++i) {
 803                         /*
 804                          * Convert any successful completions to flush
 805                          * errors to avoid passing packets up the
 806                          * stack after bringing the device down.
 807                          */
 808                         if (priv->ibwc[i].status == IB_WC_SUCCESS)
 809                                 priv->ibwc[i].status = IB_WC_WR_FLUSH_ERR;
 810
 811                         if (priv->ibwc[i].wr_id & IPOIB_OP_RECV) {
 812                                 if (priv->ibwc[i].wr_id & IPOIB_OP_CM)
 813                                         ipoib_cm_handle_rx_wc(dev, priv->ibwc + i);
 814                                 else
 815                                         ipoib_ib_handle_rx_wc(dev, priv->ibwc + i);
 816                         } else
 817                                 ipoib_cm_handle_tx_wc(dev, priv->ibwc + i);
 818                 }
 819         } while (n == IPOIB_NUM_WC);
 820
 821         while (poll_tx(priv))
 822                 ; /* nothing */
 823
 824         local_bh_enable();
 825 }
 826
 827 int ipoib_ib_dev_stop(struct net_device *dev)
 828 {
 829         struct ipoib_dev_priv *priv = netdev_priv(dev);
 830         struct ib_qp_attr qp_attr;
 831         unsigned long begin;
 832         struct ipoib_tx_buf *tx_req;
 833         int i;
 834
 835         if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
 836                 napi_disable(&priv->napi);
 837
 838         ipoib_cm_dev_stop(dev);
 839
 840         /*
 841          * Move our QP to the error state and then reinitialize in
 842          * when all work requests have completed or have been flushed.
 843          */
 844         qp_attr.qp_state = IB_QPS_ERR;
 845         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
 846                 ipoib_warn(priv, "Failed to modify QP to ERROR state\n");
 847
 848         /* Wait for all sends and receives to complete */
 849         begin = jiffies;
 850
 851         while (priv->tx_head != priv->tx_tail || recvs_pending(dev)) {
 852                 if (time_after(jiffies, begin + 5 * HZ)) {
 853                         ipoib_warn(priv, "timing out; %d sends %d receives not completed\n",
 854                                    priv->tx_head - priv->tx_tail, recvs_pending(dev));
 855
 856                         /*
 857                          * assume the HW is wedged and just free up
 858                          * all our pending work requests.
 859                          */
 860                         while ((int) priv->tx_tail - (int) priv->tx_head < 0) {
 861                                 tx_req = &priv->tx_ring[priv->tx_tail &
 862                                                         (ipoib_sendq_size - 1)];
 863                                 ipoib_dma_unmap_tx(priv->ca, tx_req);
 864                                 dev_kfree_skb_any(tx_req->skb);
 865                                 ++priv->tx_tail;
 866                                 --priv->tx_outstanding;
 867                         }
 868
 869                         for (i = 0; i < ipoib_recvq_size; ++i) {
 870                                 struct ipoib_rx_buf *rx_req;
 871
 872                                 rx_req = &priv->rx_ring[i];
 873                                 if (!rx_req->skb)
 874                                         continue;
 875                                 ipoib_ud_dma_unmap_rx(priv,
 876                                                       priv->rx_ring[i].mapping);
 877                                 dev_kfree_skb_any(rx_req->skb);
 878                                 rx_req->skb = NULL;
 879                         }
 880
 881                         goto timeout;
 882                 }
 883
 884                 ipoib_drain_cq(dev);
 885
 886                 msleep(1);
 887         }
 888
 889         ipoib_dbg(priv, "All sends and receives done.\n");
 890
 891 timeout:
 892         del_timer_sync(&priv->poll_timer);
 893         qp_attr.qp_state = IB_QPS_RESET;
 894         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
 895                 ipoib_warn(priv, "Failed to modify QP to RESET state\n");
 896
 897         ipoib_flush_ah(dev);
 898
 899         ib_req_notify_cq(priv->recv_cq, IB_CQ_NEXT_COMP);
 900
 901         return 0;
 902 }
 903
 904 int ipoib_ib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
 905 {
 906         struct ipoib_dev_priv *priv = netdev_priv(dev);
 907
 908         priv->ca = ca;
 909         priv->port = port;
 910         priv->qp = NULL;
 911
 912         if (ipoib_transport_dev_init(dev, ca)) {
 913                 printk(KERN_WARNING "%s: ipoib_transport_dev_init failed\n", ca->name);
 914                 return -ENODEV;
 915         }
 916
 917         setup_timer(&priv->poll_timer, ipoib_ib_tx_timer_func,
 918                     (unsigned long) dev);
 919
 920         if (dev->flags & IFF_UP) {
 921                 if (ipoib_ib_dev_open(dev)) {
 922                         ipoib_transport_dev_cleanup(dev);
 923                         return -ENODEV;
 924                 }
 925         }
 926
 927         return 0;
 928 }
 929
 930 /*
 931  * Takes whatever value which is in pkey index 0 and updates priv->pkey
 932  * returns 0 if the pkey value was changed.
 933  */
 934 static inline int update_parent_pkey(struct ipoib_dev_priv *priv)
 935 {
 936         int result;
 937         u16 prev_pkey;
 938
 939         prev_pkey = priv->pkey;
 940         result = ib_query_pkey(priv->ca, priv->port, 0, &priv->pkey);
 941         if (result) {
 942                 ipoib_warn(priv, "ib_query_pkey port %d failed (ret = %d)\n",
 943                            priv->port, result);
 944                 return result;
 945         }
 946
 947         priv->pkey |= 0x8000;
 948
 949         if (prev_pkey != priv->pkey) {
 950                 ipoib_dbg(priv, "pkey changed from 0x%x to 0x%x\n",
 951                           prev_pkey, priv->pkey);
 952                 /*
 953                  * Update the pkey in the broadcast address, while making sure to set
 954                  * the full membership bit, so that we join the right broadcast group.
 955                  */
 956                 priv->dev->broadcast[8] = priv->pkey >> 8;
 957                 priv->dev->broadcast[9] = priv->pkey & 0xff;
 958                 return 0;
 959         }
 960
 961         return 1;
 962 }
 963 /*
 964  * returns 0 if pkey value was found in a different slot.
 965  */
 966 static inline int update_child_pkey(struct ipoib_dev_priv *priv)
 967 {
 968         u16 old_index = priv->pkey_index;
 969
 970         priv->pkey_index = 0;
 971         ipoib_pkey_dev_check_presence(priv->dev);
 972
 973         if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags) &&
 974             (old_index == priv->pkey_index))
 975                 return 1;
 976         return 0;
 977 }
 978
 979 static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv,
 980                                 enum ipoib_flush_level level)
 981 {
 982         struct ipoib_dev_priv *cpriv;
 983         struct net_device *dev = priv->dev;
 984         int result;
 985
 986         down_read(&priv->vlan_rwsem);
 987
 988         /*
 989          * Flush any child interfaces too -- they might be up even if
 990          * the parent is down.
 991          */
 992         list_for_each_entry(cpriv, &priv->child_intfs, list)
 993                 __ipoib_ib_dev_flush(cpriv, level);
 994
 995         up_read(&priv->vlan_rwsem);
 996
 997         if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags) &&
 998             level != IPOIB_FLUSH_HEAVY) {
 999                 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n");
1000                 return;
1001         }
1002
1003         if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
1004                 /* interface is down. update pkey and leave. */
1005                 if (level == IPOIB_FLUSH_HEAVY) {
1006                         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags))
1007                                 update_parent_pkey(priv);
1008                         else
1009                                 update_child_pkey(priv);
1010                 }
1011                 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n");
1012                 return;
1013         }
1014
1015         if (level == IPOIB_FLUSH_HEAVY) {
1016                 /* child devices chase their origin pkey value, while non-child
1017                  * (parent) devices should always takes what present in pkey index 0
1018                  */
1019                 if (test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
1020                         result = update_child_pkey(priv);
1021                         if (result) {
1022                                 /* restart QP only if P_Key index is changed */
1023                                 ipoib_dbg(priv, "Not flushing - P_Key index not changed.\n");
1024                                 return;
1025                         }
1026
1027                 } else {
1028                         result = update_parent_pkey(priv);
1029                         /* restart QP only if P_Key value changed */
1030                         if (result) {
1031                                 ipoib_dbg(priv, "Not flushing - P_Key value not changed.\n");
1032                                 return;
1033                         }
1034                 }
1035         }
1036
1037         if (level == IPOIB_FLUSH_LIGHT) {
1038                 ipoib_mark_paths_invalid(dev);
1039                 ipoib_mcast_dev_flush(dev);
1040                 ipoib_flush_ah(dev);
1041         }
1042
1043         if (level >= IPOIB_FLUSH_NORMAL)
1044                 ipoib_ib_dev_down(dev);
1045
1046         if (level == IPOIB_FLUSH_HEAVY) {
1047                 if (test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
1048                         ipoib_ib_dev_stop(dev);
1049                 if (ipoib_ib_dev_open(dev) != 0)
1050                         return;
1051                 if (netif_queue_stopped(dev))
1052                         netif_start_queue(dev);
1053         }
1054
1055         /*
1056          * The device could have been brought down between the start and when
1057          * we get here, don't bring it back up if it's not configured up
1058          */
1059         if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
1060                 if (level >= IPOIB_FLUSH_NORMAL)
1061                         ipoib_ib_dev_up(dev);
1062                 ipoib_mcast_restart_task(&priv->restart_task);
1063         }
1064 }
1065
1066 void ipoib_ib_dev_flush_light(struct work_struct *work)
1067 {
1068         struct ipoib_dev_priv *priv =
1069                 container_of(work, struct ipoib_dev_priv, flush_light);
1070
1071         __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_LIGHT);
1072 }
1073
1074 void ipoib_ib_dev_flush_normal(struct work_struct *work)
1075 {
1076         struct ipoib_dev_priv *priv =
1077                 container_of(work, struct ipoib_dev_priv, flush_normal);
1078
1079         __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_NORMAL);
1080 }
1081
1082 void ipoib_ib_dev_flush_heavy(struct work_struct *work)
1083 {
1084         struct ipoib_dev_priv *priv =
1085                 container_of(work, struct ipoib_dev_priv, flush_heavy);
1086
1087         __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_HEAVY);
1088 }
1089
1090 void ipoib_ib_dev_cleanup(struct net_device *dev)
1091 {
1092         struct ipoib_dev_priv *priv = netdev_priv(dev);
1093
1094         ipoib_dbg(priv, "cleaning up ib_dev\n");
1095         /*
1096          * We must make sure there are no more (path) completions
1097          * that may wish to touch priv fields that are no longer valid
1098          */
1099         ipoib_flush_paths(dev);
1100
1101         ipoib_mcast_stop_thread(dev);
1102         ipoib_mcast_dev_flush(dev);
1103
1104         /*
1105          * All of our ah references aren't free until after
1106          * ipoib_mcast_dev_flush(), ipoib_flush_paths, and
1107          * the neighbor garbage collection is stopped and reaped.
1108          * That should all be done now, so make a final ah flush.
1109          */
1110         ipoib_stop_ah(dev);
1111
1112         ipoib_transport_dev_cleanup(dev);
1113 }
1114
1115