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 += 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) &&
 300                         likely(wc->wc_flags & IB_WC_IP_CSUM_OK))
 301                 skb->ip_summed = CHECKSUM_UNNECESSARY;
 302
 303         napi_gro_receive(&priv->napi, skb);
 304
 305 repost:
 306         if (unlikely(ipoib_ib_post_receive(dev, wr_id)))
 307                 ipoib_warn(priv, "ipoib_ib_post_receive failed "
 308                            "for buf %d\n", wr_id);
 309 }
 310
 311 static int ipoib_dma_map_tx(struct ib_device *ca,
 312                             struct ipoib_tx_buf *tx_req)
 313 {
 314         struct sk_buff *skb = tx_req->skb;
 315         u64 *mapping = tx_req->mapping;
 316         int i;
 317         int off;
 318
 319         if (skb_headlen(skb)) {
 320                 mapping[0] = ib_dma_map_single(ca, skb->data, skb_headlen(skb),
 321                                                DMA_TO_DEVICE);
 322                 if (unlikely(ib_dma_mapping_error(ca, mapping[0])))
 323                         return -EIO;
 324
 325                 off = 1;
 326         } else
 327                 off = 0;
 328
 329         for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) {
 330                 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 331                 mapping[i + off] = ib_dma_map_page(ca,
 332                                                  skb_frag_page(frag),
 333                                                  frag->page_offset, skb_frag_size(frag),
 334                                                  DMA_TO_DEVICE);
 335                 if (unlikely(ib_dma_mapping_error(ca, mapping[i + off])))
 336                         goto partial_error;
 337         }
 338         return 0;
 339
 340 partial_error:
 341         for (; i > 0; --i) {
 342                 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i - 1];
 343
 344                 ib_dma_unmap_page(ca, mapping[i - !off], skb_frag_size(frag), DMA_TO_DEVICE);
 345         }
 346
 347         if (off)
 348                 ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE);
 349
 350         return -EIO;
 351 }
 352
 353 static void ipoib_dma_unmap_tx(struct ib_device *ca,
 354                                struct ipoib_tx_buf *tx_req)
 355 {
 356         struct sk_buff *skb = tx_req->skb;
 357         u64 *mapping = tx_req->mapping;
 358         int i;
 359         int off;
 360
 361         if (skb_headlen(skb)) {
 362                 ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE);
 363                 off = 1;
 364         } else
 365                 off = 0;
 366
 367         for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) {
 368                 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 369
 370                 ib_dma_unmap_page(ca, mapping[i + off], skb_frag_size(frag),
 371                                   DMA_TO_DEVICE);
 372         }
 373 }
 374
 375 static void ipoib_ib_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
 376 {
 377         struct ipoib_dev_priv *priv = netdev_priv(dev);
 378         unsigned int wr_id = wc->wr_id;
 379         struct ipoib_tx_buf *tx_req;
 380
 381         ipoib_dbg_data(priv, "send completion: id %d, status: %d\n",
 382                        wr_id, wc->status);
 383
 384         if (unlikely(wr_id >= ipoib_sendq_size)) {
 385                 ipoib_warn(priv, "send completion event with wrid %d (> %d)\n",
 386                            wr_id, ipoib_sendq_size);
 387                 return;
 388         }
 389
 390         tx_req = &priv->tx_ring[wr_id];
 391
 392         ipoib_dma_unmap_tx(priv->ca, tx_req);
 393
 394         ++dev->stats.tx_packets;
 395         dev->stats.tx_bytes += tx_req->skb->len;
 396
 397         dev_kfree_skb_any(tx_req->skb);
 398
 399         ++priv->tx_tail;
 400         if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
 401             netif_queue_stopped(dev) &&
 402             test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
 403                 netif_wake_queue(dev);
 404
 405         if (wc->status != IB_WC_SUCCESS &&
 406             wc->status != IB_WC_WR_FLUSH_ERR)
 407                 ipoib_warn(priv, "failed send event "
 408                            "(status=%d, wrid=%d vend_err %x)\n",
 409                            wc->status, wr_id, wc->vendor_err);
 410 }
 411
 412 static int poll_tx(struct ipoib_dev_priv *priv)
 413 {
 414         int n, i;
 415
 416         n = ib_poll_cq(priv->send_cq, MAX_SEND_CQE, priv->send_wc);
 417         for (i = 0; i < n; ++i)
 418                 ipoib_ib_handle_tx_wc(priv->dev, priv->send_wc + i);
 419
 420         return n == MAX_SEND_CQE;
 421 }
 422
 423 int ipoib_poll(struct napi_struct *napi, int budget)
 424 {
 425         struct ipoib_dev_priv *priv = container_of(napi, struct ipoib_dev_priv, napi);
 426         struct net_device *dev = priv->dev;
 427         int done;
 428         int t;
 429         int n, i;
 430
 431         done  = 0;
 432
 433 poll_more:
 434         while (done < budget) {
 435                 int max = (budget - done);
 436
 437                 t = min(IPOIB_NUM_WC, max);
 438                 n = ib_poll_cq(priv->recv_cq, t, priv->ibwc);
 439
 440                 for (i = 0; i < n; i++) {
 441                         struct ib_wc *wc = priv->ibwc + i;
 442
 443                         if (wc->wr_id & IPOIB_OP_RECV) {
 444                                 ++done;
 445                                 if (wc->wr_id & IPOIB_OP_CM)
 446                                         ipoib_cm_handle_rx_wc(dev, wc);
 447                                 else
 448                                         ipoib_ib_handle_rx_wc(dev, wc);
 449                         } else
 450                                 ipoib_cm_handle_tx_wc(priv->dev, wc);
 451                 }
 452
 453                 if (n != t)
 454                         break;
 455         }
 456
 457         if (done < budget) {
 458                 napi_complete(napi);
 459                 if (unlikely(ib_req_notify_cq(priv->recv_cq,
 460                                               IB_CQ_NEXT_COMP |
 461                                               IB_CQ_REPORT_MISSED_EVENTS)) &&
 462                     napi_reschedule(napi))
 463                         goto poll_more;
 464         }
 465
 466         return done;
 467 }
 468
 469 void ipoib_ib_completion(struct ib_cq *cq, void *dev_ptr)
 470 {
 471         struct net_device *dev = dev_ptr;
 472         struct ipoib_dev_priv *priv = netdev_priv(dev);
 473
 474         napi_schedule(&priv->napi);
 475 }
 476
 477 static void drain_tx_cq(struct net_device *dev)
 478 {
 479         struct ipoib_dev_priv *priv = netdev_priv(dev);
 480
 481         netif_tx_lock(dev);
 482         while (poll_tx(priv))
 483                 ; /* nothing */
 484
 485         if (netif_queue_stopped(dev))
 486                 mod_timer(&priv->poll_timer, jiffies + 1);
 487
 488         netif_tx_unlock(dev);
 489 }
 490
 491 void ipoib_send_comp_handler(struct ib_cq *cq, void *dev_ptr)
 492 {
 493         struct ipoib_dev_priv *priv = netdev_priv(dev_ptr);
 494
 495         mod_timer(&priv->poll_timer, jiffies);
 496 }
 497
 498 static inline int post_send(struct ipoib_dev_priv *priv,
 499                             unsigned int wr_id,
 500                             struct ib_ah *address, u32 qpn,
 501                             struct ipoib_tx_buf *tx_req,
 502                             void *head, int hlen)
 503 {
 504         struct ib_send_wr *bad_wr;
 505         int i, off;
 506         struct sk_buff *skb = tx_req->skb;
 507         skb_frag_t *frags = skb_shinfo(skb)->frags;
 508         int nr_frags = skb_shinfo(skb)->nr_frags;
 509         u64 *mapping = tx_req->mapping;
 510
 511         if (skb_headlen(skb)) {
 512                 priv->tx_sge[0].addr         = mapping[0];
 513                 priv->tx_sge[0].length       = skb_headlen(skb);
 514                 off = 1;
 515         } else
 516                 off = 0;
 517
 518         for (i = 0; i < nr_frags; ++i) {
 519                 priv->tx_sge[i + off].addr = mapping[i + off];
 520                 priv->tx_sge[i + off].length = skb_frag_size(&frags[i]);
 521         }
 522         priv->tx_wr.num_sge          = nr_frags + off;
 523         priv->tx_wr.wr_id            = wr_id;
 524         priv->tx_wr.wr.ud.remote_qpn = qpn;
 525         priv->tx_wr.wr.ud.ah         = address;
 526
 527         if (head) {
 528                 priv->tx_wr.wr.ud.mss    = skb_shinfo(skb)->gso_size;
 529                 priv->tx_wr.wr.ud.header = head;
 530                 priv->tx_wr.wr.ud.hlen   = hlen;
 531                 priv->tx_wr.opcode       = IB_WR_LSO;
 532         } else
 533                 priv->tx_wr.opcode       = IB_WR_SEND;
 534
 535         return ib_post_send(priv->qp, &priv->tx_wr, &bad_wr);
 536 }
 537
 538 void ipoib_send(struct net_device *dev, struct sk_buff *skb,
 539                 struct ipoib_ah *address, u32 qpn)
 540 {
 541         struct ipoib_dev_priv *priv = netdev_priv(dev);
 542         struct ipoib_tx_buf *tx_req;
 543         int hlen, rc;
 544         void *phead;
 545
 546         if (skb_is_gso(skb)) {
 547                 hlen = skb_transport_offset(skb) + tcp_hdrlen(skb);
 548                 phead = skb->data;
 549                 if (unlikely(!skb_pull(skb, hlen))) {
 550                         ipoib_warn(priv, "linear data too small\n");
 551                         ++dev->stats.tx_dropped;
 552                         ++dev->stats.tx_errors;
 553                         dev_kfree_skb_any(skb);
 554                         return;
 555                 }
 556         } else {
 557                 if (unlikely(skb->len > priv->mcast_mtu + IPOIB_ENCAP_LEN)) {
 558                         ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
 559                                    skb->len, priv->mcast_mtu + IPOIB_ENCAP_LEN);
 560                         ++dev->stats.tx_dropped;
 561                         ++dev->stats.tx_errors;
 562                         ipoib_cm_skb_too_long(dev, skb, priv->mcast_mtu);
 563                         return;
 564                 }
 565                 phead = NULL;
 566                 hlen  = 0;
 567         }
 568
 569         ipoib_dbg_data(priv, "sending packet, length=%d address=%p qpn=0x%06x\n",
 570                        skb->len, address, qpn);
 571
 572         /*
 573          * We put the skb into the tx_ring _before_ we call post_send()
 574          * because it's entirely possible that the completion handler will
 575          * run before we execute anything after the post_send().  That
 576          * means we have to make sure everything is properly recorded and
 577          * our state is consistent before we call post_send().
 578          */
 579         tx_req = &priv->tx_ring[priv->tx_head & (ipoib_sendq_size - 1)];
 580         tx_req->skb = skb;
 581         if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req))) {
 582                 ++dev->stats.tx_errors;
 583                 dev_kfree_skb_any(skb);
 584                 return;
 585         }
 586
 587         if (skb->ip_summed == CHECKSUM_PARTIAL)
 588                 priv->tx_wr.send_flags |= IB_SEND_IP_CSUM;
 589         else
 590                 priv->tx_wr.send_flags &= ~IB_SEND_IP_CSUM;
 591
 592         if (++priv->tx_outstanding == ipoib_sendq_size) {
 593                 ipoib_dbg(priv, "TX ring full, stopping kernel net queue\n");
 594                 if (ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP))
 595                         ipoib_warn(priv, "request notify on send CQ failed\n");
 596                 netif_stop_queue(dev);
 597         }
 598
 599         rc = post_send(priv, priv->tx_head & (ipoib_sendq_size - 1),
 600                        address->ah, qpn, tx_req, phead, hlen);
 601         if (unlikely(rc)) {
 602                 ipoib_warn(priv, "post_send failed, error %d\n", rc);
 603                 ++dev->stats.tx_errors;
 604                 --priv->tx_outstanding;
 605                 ipoib_dma_unmap_tx(priv->ca, tx_req);
 606                 dev_kfree_skb_any(skb);
 607                 if (netif_queue_stopped(dev))
 608                         netif_wake_queue(dev);
 609         } else {
 610                 dev->trans_start = jiffies;
 611
 612                 address->last_send = priv->tx_head;
 613                 ++priv->tx_head;
 614                 skb_orphan(skb);
 615
 616         }
 617
 618         if (unlikely(priv->tx_outstanding > MAX_SEND_CQE))
 619                 while (poll_tx(priv))
 620                         ; /* nothing */
 621 }
 622
 623 static void __ipoib_reap_ah(struct net_device *dev)
 624 {
 625         struct ipoib_dev_priv *priv = netdev_priv(dev);
 626         struct ipoib_ah *ah, *tah;
 627         LIST_HEAD(remove_list);
 628         unsigned long flags;
 629
 630         netif_tx_lock_bh(dev);
 631         spin_lock_irqsave(&priv->lock, flags);
 632
 633         list_for_each_entry_safe(ah, tah, &priv->dead_ahs, list)
 634                 if ((int) priv->tx_tail - (int) ah->last_send >= 0) {
 635                         list_del(&ah->list);
 636                         ib_destroy_ah(ah->ah);
 637                         kfree(ah);
 638                 }
 639
 640         spin_unlock_irqrestore(&priv->lock, flags);
 641         netif_tx_unlock_bh(dev);
 642 }
 643
 644 void ipoib_reap_ah(struct work_struct *work)
 645 {
 646         struct ipoib_dev_priv *priv =
 647                 container_of(work, struct ipoib_dev_priv, ah_reap_task.work);
 648         struct net_device *dev = priv->dev;
 649
 650         __ipoib_reap_ah(dev);
 651
 652         if (!test_bit(IPOIB_STOP_REAPER, &priv->flags))
 653                 queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task,
 654                                    round_jiffies_relative(HZ));
 655 }
 656
 657 static void ipoib_ib_tx_timer_func(unsigned long ctx)
 658 {
 659         drain_tx_cq((struct net_device *)ctx);
 660 }
 661
 662 int ipoib_ib_dev_open(struct net_device *dev)
 663 {
 664         struct ipoib_dev_priv *priv = netdev_priv(dev);
 665         int ret;
 666
 667         if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &priv->pkey_index)) {
 668                 ipoib_warn(priv, "P_Key 0x%04x not found\n", priv->pkey);
 669                 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 670                 return -1;
 671         }
 672         set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 673
 674         ret = ipoib_init_qp(dev);
 675         if (ret) {
 676                 ipoib_warn(priv, "ipoib_init_qp returned %d\n", ret);
 677                 return -1;
 678         }
 679
 680         ret = ipoib_ib_post_receives(dev);
 681         if (ret) {
 682                 ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret);
 683                 ipoib_ib_dev_stop(dev, 1);
 684                 return -1;
 685         }
 686
 687         ret = ipoib_cm_dev_open(dev);
 688         if (ret) {
 689                 ipoib_warn(priv, "ipoib_cm_dev_open returned %d\n", ret);
 690                 ipoib_ib_dev_stop(dev, 1);
 691                 return -1;
 692         }
 693
 694         clear_bit(IPOIB_STOP_REAPER, &priv->flags);
 695         queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task,
 696                            round_jiffies_relative(HZ));
 697
 698         if (!test_and_set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
 699                 napi_enable(&priv->napi);
 700
 701         return 0;
 702 }
 703
 704 static void ipoib_pkey_dev_check_presence(struct net_device *dev)
 705 {
 706         struct ipoib_dev_priv *priv = netdev_priv(dev);
 707         u16 pkey_index = 0;
 708
 709         if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &pkey_index))
 710                 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 711         else
 712                 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 713 }
 714
 715 int ipoib_ib_dev_up(struct net_device *dev)
 716 {
 717         struct ipoib_dev_priv *priv = netdev_priv(dev);
 718
 719         ipoib_pkey_dev_check_presence(dev);
 720
 721         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
 722                 ipoib_dbg(priv, "PKEY is not assigned.\n");
 723                 return 0;
 724         }
 725
 726         set_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
 727
 728         return ipoib_mcast_start_thread(dev);
 729 }
 730
 731 int ipoib_ib_dev_down(struct net_device *dev, int flush)
 732 {
 733         struct ipoib_dev_priv *priv = netdev_priv(dev);
 734
 735         ipoib_dbg(priv, "downing ib_dev\n");
 736
 737         clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
 738         netif_carrier_off(dev);
 739
 740         /* Shutdown the P_Key thread if still active */
 741         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
 742                 mutex_lock(&pkey_mutex);
 743                 set_bit(IPOIB_PKEY_STOP, &priv->flags);
 744                 cancel_delayed_work(&priv->pkey_poll_task);
 745                 mutex_unlock(&pkey_mutex);
 746                 if (flush)
 747                         flush_workqueue(ipoib_workqueue);
 748         }
 749
 750         ipoib_mcast_stop_thread(dev, flush);
 751         ipoib_mcast_dev_flush(dev);
 752
 753         ipoib_flush_paths(dev);
 754
 755         return 0;
 756 }
 757
 758 static int recvs_pending(struct net_device *dev)
 759 {
 760         struct ipoib_dev_priv *priv = netdev_priv(dev);
 761         int pending = 0;
 762         int i;
 763
 764         for (i = 0; i < ipoib_recvq_size; ++i)
 765                 if (priv->rx_ring[i].skb)
 766                         ++pending;
 767
 768         return pending;
 769 }
 770
 771 void ipoib_drain_cq(struct net_device *dev)
 772 {
 773         struct ipoib_dev_priv *priv = netdev_priv(dev);
 774         int i, n;
 775
 776         /*
 777          * We call completion handling routines that expect to be
 778          * called from the BH-disabled NAPI poll context, so disable
 779          * BHs here too.
 780          */
 781         local_bh_disable();
 782
 783         do {
 784                 n = ib_poll_cq(priv->recv_cq, IPOIB_NUM_WC, priv->ibwc);
 785                 for (i = 0; i < n; ++i) {
 786                         /*
 787                          * Convert any successful completions to flush
 788                          * errors to avoid passing packets up the
 789                          * stack after bringing the device down.
 790                          */
 791                         if (priv->ibwc[i].status == IB_WC_SUCCESS)
 792                                 priv->ibwc[i].status = IB_WC_WR_FLUSH_ERR;
 793
 794                         if (priv->ibwc[i].wr_id & IPOIB_OP_RECV) {
 795                                 if (priv->ibwc[i].wr_id & IPOIB_OP_CM)
 796                                         ipoib_cm_handle_rx_wc(dev, priv->ibwc + i);
 797                                 else
 798                                         ipoib_ib_handle_rx_wc(dev, priv->ibwc + i);
 799                         } else
 800                                 ipoib_cm_handle_tx_wc(dev, priv->ibwc + i);
 801                 }
 802         } while (n == IPOIB_NUM_WC);
 803
 804         while (poll_tx(priv))
 805                 ; /* nothing */
 806
 807         local_bh_enable();
 808 }
 809
 810 int ipoib_ib_dev_stop(struct net_device *dev, int flush)
 811 {
 812         struct ipoib_dev_priv *priv = netdev_priv(dev);
 813         struct ib_qp_attr qp_attr;
 814         unsigned long begin;
 815         struct ipoib_tx_buf *tx_req;
 816         int i;
 817
 818         if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
 819                 napi_disable(&priv->napi);
 820
 821         ipoib_cm_dev_stop(dev);
 822
 823         /*
 824          * Move our QP to the error state and then reinitialize in
 825          * when all work requests have completed or have been flushed.
 826          */
 827         qp_attr.qp_state = IB_QPS_ERR;
 828         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
 829                 ipoib_warn(priv, "Failed to modify QP to ERROR state\n");
 830
 831         /* Wait for all sends and receives to complete */
 832         begin = jiffies;
 833
 834         while (priv->tx_head != priv->tx_tail || recvs_pending(dev)) {
 835                 if (time_after(jiffies, begin + 5 * HZ)) {
 836                         ipoib_warn(priv, "timing out; %d sends %d receives not completed\n",
 837                                    priv->tx_head - priv->tx_tail, recvs_pending(dev));
 838
 839                         /*
 840                          * assume the HW is wedged and just free up
 841                          * all our pending work requests.
 842                          */
 843                         while ((int) priv->tx_tail - (int) priv->tx_head < 0) {
 844                                 tx_req = &priv->tx_ring[priv->tx_tail &
 845                                                         (ipoib_sendq_size - 1)];
 846                                 ipoib_dma_unmap_tx(priv->ca, tx_req);
 847                                 dev_kfree_skb_any(tx_req->skb);
 848                                 ++priv->tx_tail;
 849                                 --priv->tx_outstanding;
 850                         }
 851
 852                         for (i = 0; i < ipoib_recvq_size; ++i) {
 853                                 struct ipoib_rx_buf *rx_req;
 854
 855                                 rx_req = &priv->rx_ring[i];
 856                                 if (!rx_req->skb)
 857                                         continue;
 858                                 ipoib_ud_dma_unmap_rx(priv,
 859                                                       priv->rx_ring[i].mapping);
 860                                 dev_kfree_skb_any(rx_req->skb);
 861                                 rx_req->skb = NULL;
 862                         }
 863
 864                         goto timeout;
 865                 }
 866
 867                 ipoib_drain_cq(dev);
 868
 869                 msleep(1);
 870         }
 871
 872         ipoib_dbg(priv, "All sends and receives done.\n");
 873
 874 timeout:
 875         del_timer_sync(&priv->poll_timer);
 876         qp_attr.qp_state = IB_QPS_RESET;
 877         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
 878                 ipoib_warn(priv, "Failed to modify QP to RESET state\n");
 879
 880         /* Wait for all AHs to be reaped */
 881         set_bit(IPOIB_STOP_REAPER, &priv->flags);
 882         cancel_delayed_work(&priv->ah_reap_task);
 883         if (flush)
 884                 flush_workqueue(ipoib_workqueue);
 885
 886         begin = jiffies;
 887
 888         while (!list_empty(&priv->dead_ahs)) {
 889                 __ipoib_reap_ah(dev);
 890
 891                 if (time_after(jiffies, begin + HZ)) {
 892                         ipoib_warn(priv, "timing out; will leak address handles\n");
 893                         break;
 894                 }
 895
 896                 msleep(1);
 897         }
 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 static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv,
 931                                 enum ipoib_flush_level level)
 932 {
 933         struct ipoib_dev_priv *cpriv;
 934         struct net_device *dev = priv->dev;
 935         u16 new_index;
 936
 937         mutex_lock(&priv->vlan_mutex);
 938
 939         /*
 940          * Flush any child interfaces too -- they might be up even if
 941          * the parent is down.
 942          */
 943         list_for_each_entry(cpriv, &priv->child_intfs, list)
 944                 __ipoib_ib_dev_flush(cpriv, level);
 945
 946         mutex_unlock(&priv->vlan_mutex);
 947
 948         if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) {
 949                 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n");
 950                 return;
 951         }
 952
 953         if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
 954                 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n");
 955                 return;
 956         }
 957
 958         if (level == IPOIB_FLUSH_HEAVY) {
 959                 if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &new_index)) {
 960                         clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 961                         ipoib_ib_dev_down(dev, 0);
 962                         ipoib_ib_dev_stop(dev, 0);
 963                         if (ipoib_pkey_dev_delay_open(dev))
 964                                 return;
 965                 }
 966
 967                 /* restart QP only if P_Key index is changed */
 968                 if (test_and_set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags) &&
 969                     new_index == priv->pkey_index) {
 970                         ipoib_dbg(priv, "Not flushing - P_Key index not changed.\n");
 971                         return;
 972                 }
 973                 priv->pkey_index = new_index;
 974         }
 975
 976         if (level == IPOIB_FLUSH_LIGHT) {
 977                 ipoib_mark_paths_invalid(dev);
 978                 ipoib_mcast_dev_flush(dev);
 979         }
 980
 981         if (level >= IPOIB_FLUSH_NORMAL)
 982                 ipoib_ib_dev_down(dev, 0);
 983
 984         if (level == IPOIB_FLUSH_HEAVY) {
 985                 ipoib_ib_dev_stop(dev, 0);
 986                 ipoib_ib_dev_open(dev);
 987         }
 988
 989         /*
 990          * The device could have been brought down between the start and when
 991          * we get here, don't bring it back up if it's not configured up
 992          */
 993         if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
 994                 if (level >= IPOIB_FLUSH_NORMAL)
 995                         ipoib_ib_dev_up(dev);
 996                 ipoib_mcast_restart_task(&priv->restart_task);
 997         }
 998 }
 999
1000 void ipoib_ib_dev_flush_light(struct work_struct *work)
1001 {
1002         struct ipoib_dev_priv *priv =
1003                 container_of(work, struct ipoib_dev_priv, flush_light);
1004
1005         __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_LIGHT);
1006 }
1007
1008 void ipoib_ib_dev_flush_normal(struct work_struct *work)
1009 {
1010         struct ipoib_dev_priv *priv =
1011                 container_of(work, struct ipoib_dev_priv, flush_normal);
1012
1013         __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_NORMAL);
1014 }
1015
1016 void ipoib_ib_dev_flush_heavy(struct work_struct *work)
1017 {
1018         struct ipoib_dev_priv *priv =
1019                 container_of(work, struct ipoib_dev_priv, flush_heavy);
1020
1021         __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_HEAVY);
1022 }
1023
1024 void ipoib_ib_dev_cleanup(struct net_device *dev)
1025 {
1026         struct ipoib_dev_priv *priv = netdev_priv(dev);
1027
1028         ipoib_dbg(priv, "cleaning up ib_dev\n");
1029
1030         ipoib_mcast_stop_thread(dev, 1);
1031         ipoib_mcast_dev_flush(dev);
1032
1033         ipoib_transport_dev_cleanup(dev);
1034 }
1035
1036 /*
1037  * Delayed P_Key Assigment Interim Support
1038  *
1039  * The following is initial implementation of delayed P_Key assigment
1040  * mechanism. It is using the same approach implemented for the multicast
1041  * group join. The single goal of this implementation is to quickly address
1042  * Bug #2507. This implementation will probably be removed when the P_Key
1043  * change async notification is available.
1044  */
1045
1046 void ipoib_pkey_poll(struct work_struct *work)
1047 {
1048         struct ipoib_dev_priv *priv =
1049                 container_of(work, struct ipoib_dev_priv, pkey_poll_task.work);
1050         struct net_device *dev = priv->dev;
1051
1052         ipoib_pkey_dev_check_presence(dev);
1053
1054         if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags))
1055                 ipoib_open(dev);
1056         else {
1057                 mutex_lock(&pkey_mutex);
1058                 if (!test_bit(IPOIB_PKEY_STOP, &priv->flags))
1059                         queue_delayed_work(ipoib_workqueue,
1060                                            &priv->pkey_poll_task,
1061                                            HZ);
1062                 mutex_unlock(&pkey_mutex);
1063         }
1064 }
1065
1066 int ipoib_pkey_dev_delay_open(struct net_device *dev)
1067 {
1068         struct ipoib_dev_priv *priv = netdev_priv(dev);
1069
1070         /* Look for the interface pkey value in the IB Port P_Key table and */
1071         /* set the interface pkey assigment flag                            */
1072         ipoib_pkey_dev_check_presence(dev);
1073
1074         /* P_Key value not assigned yet - start polling */
1075         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
1076                 mutex_lock(&pkey_mutex);
1077                 clear_bit(IPOIB_PKEY_STOP, &priv->flags);
1078                 queue_delayed_work(ipoib_workqueue,
1079                                    &priv->pkey_poll_task,
1080                                    HZ);
1081                 mutex_unlock(&pkey_mutex);
1082                 return 1;
1083         }
1084
1085         return 0;
1086 }