git.oblomov.eu Git - linux-2.6/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  * $Id: ipoib_ib.c 1386 2004-12-27 16:23:17Z roland $
  36  */
  37
  38 #include <linux/delay.h>
  39 #include <linux/dma-mapping.h>
  40
  41 #include <rdma/ib_cache.h>
  42 #include <linux/ip.h>
  43 #include <linux/tcp.h>
  44
  45 #include "ipoib.h"
  46
  47 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA
  48 static int data_debug_level;
  49
  50 module_param(data_debug_level, int, 0644);
  51 MODULE_PARM_DESC(data_debug_level,
  52                  "Enable data path debug tracing if > 0");
  53 #endif
  54
  55 static DEFINE_MUTEX(pkey_mutex);
  56
  57 struct ipoib_ah *ipoib_create_ah(struct net_device *dev,
  58                                  struct ib_pd *pd, struct ib_ah_attr *attr)
  59 {
  60         struct ipoib_ah *ah;
  61
  62         ah = kmalloc(sizeof *ah, GFP_KERNEL);
  63         if (!ah)
  64                 return NULL;
  65
  66         ah->dev       = dev;
  67         ah->last_send = 0;
  68         kref_init(&ah->ref);
  69
  70         ah->ah = ib_create_ah(pd, attr);
  71         if (IS_ERR(ah->ah)) {
  72                 kfree(ah);
  73                 ah = NULL;
  74         } else
  75                 ipoib_dbg(netdev_priv(dev), "Created ah %p\n", ah->ah);
  76
  77         return ah;
  78 }
  79
  80 void ipoib_free_ah(struct kref *kref)
  81 {
  82         struct ipoib_ah *ah = container_of(kref, struct ipoib_ah, ref);
  83         struct ipoib_dev_priv *priv = netdev_priv(ah->dev);
  84
  85         unsigned long flags;
  86
  87         spin_lock_irqsave(&priv->lock, flags);
  88         list_add_tail(&ah->list, &priv->dead_ahs);
  89         spin_unlock_irqrestore(&priv->lock, flags);
  90 }
  91
  92 static void ipoib_ud_dma_unmap_rx(struct ipoib_dev_priv *priv,
  93                                   u64 mapping[IPOIB_UD_RX_SG])
  94 {
  95         if (ipoib_ud_need_sg(priv->max_ib_mtu)) {
  96                 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_UD_HEAD_SIZE,
  97                                     DMA_FROM_DEVICE);
  98                 ib_dma_unmap_page(priv->ca, mapping[1], PAGE_SIZE,
  99                                   DMA_FROM_DEVICE);
 100         } else
 101                 ib_dma_unmap_single(priv->ca, mapping[0],
 102                                     IPOIB_UD_BUF_SIZE(priv->max_ib_mtu),
 103                                     DMA_FROM_DEVICE);
 104 }
 105
 106 static void ipoib_ud_skb_put_frags(struct ipoib_dev_priv *priv,
 107                                    struct sk_buff *skb,
 108                                    unsigned int length)
 109 {
 110         if (ipoib_ud_need_sg(priv->max_ib_mtu)) {
 111                 skb_frag_t *frag = &skb_shinfo(skb)->frags[0];
 112                 unsigned int size;
 113                 /*
 114                  * There is only two buffers needed for max_payload = 4K,
 115                  * first buf size is IPOIB_UD_HEAD_SIZE
 116                  */
 117                 skb->tail += IPOIB_UD_HEAD_SIZE;
 118                 skb->len  += length;
 119
 120                 size = length - IPOIB_UD_HEAD_SIZE;
 121
 122                 frag->size     = size;
 123                 skb->data_len += size;
 124                 skb->truesize += size;
 125         } else
 126                 skb_put(skb, length);
 127
 128 }
 129
 130 static int ipoib_ib_post_receive(struct net_device *dev, int id)
 131 {
 132         struct ipoib_dev_priv *priv = netdev_priv(dev);
 133         struct ib_recv_wr *bad_wr;
 134         int ret;
 135
 136         priv->rx_wr.wr_id   = id | IPOIB_OP_RECV;
 137         priv->rx_sge[0].addr = priv->rx_ring[id].mapping[0];
 138         priv->rx_sge[1].addr = priv->rx_ring[id].mapping[1];
 139
 140
 141         ret = ib_post_recv(priv->qp, &priv->rx_wr, &bad_wr);
 142         if (unlikely(ret)) {
 143                 ipoib_warn(priv, "receive failed for buf %d (%d)\n", id, ret);
 144                 ipoib_ud_dma_unmap_rx(priv, priv->rx_ring[id].mapping);
 145                 dev_kfree_skb_any(priv->rx_ring[id].skb);
 146                 priv->rx_ring[id].skb = NULL;
 147         }
 148
 149         return ret;
 150 }
 151
 152 static struct sk_buff *ipoib_alloc_rx_skb(struct net_device *dev, int id)
 153 {
 154         struct ipoib_dev_priv *priv = netdev_priv(dev);
 155         struct sk_buff *skb;
 156         int buf_size;
 157         u64 *mapping;
 158
 159         if (ipoib_ud_need_sg(priv->max_ib_mtu))
 160                 buf_size = IPOIB_UD_HEAD_SIZE;
 161         else
 162                 buf_size = IPOIB_UD_BUF_SIZE(priv->max_ib_mtu);
 163
 164         skb = dev_alloc_skb(buf_size + 4);
 165         if (unlikely(!skb))
 166                 return NULL;
 167
 168         /*
 169          * IB will leave a 40 byte gap for a GRH and IPoIB adds a 4 byte
 170          * header.  So we need 4 more bytes to get to 48 and align the
 171          * IP header to a multiple of 16.
 172          */
 173         skb_reserve(skb, 4);
 174
 175         mapping = priv->rx_ring[id].mapping;
 176         mapping[0] = ib_dma_map_single(priv->ca, skb->data, buf_size,
 177                                        DMA_FROM_DEVICE);
 178         if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0])))
 179                 goto error;
 180
 181         if (ipoib_ud_need_sg(priv->max_ib_mtu)) {
 182                 struct page *page = alloc_page(GFP_ATOMIC);
 183                 if (!page)
 184                         goto partial_error;
 185                 skb_fill_page_desc(skb, 0, page, 0, PAGE_SIZE);
 186                 mapping[1] =
 187                         ib_dma_map_page(priv->ca, skb_shinfo(skb)->frags[0].page,
 188                                         0, PAGE_SIZE, DMA_FROM_DEVICE);
 189                 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[1])))
 190                         goto partial_error;
 191         }
 192
 193         priv->rx_ring[id].skb = skb;
 194         return skb;
 195
 196 partial_error:
 197         ib_dma_unmap_single(priv->ca, mapping[0], buf_size, DMA_FROM_DEVICE);
 198 error:
 199         dev_kfree_skb_any(skb);
 200         return NULL;
 201 }
 202
 203 static int ipoib_ib_post_receives(struct net_device *dev)
 204 {
 205         struct ipoib_dev_priv *priv = netdev_priv(dev);
 206         int i;
 207
 208         for (i = 0; i < ipoib_recvq_size; ++i) {
 209                 if (!ipoib_alloc_rx_skb(dev, i)) {
 210                         ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
 211                         return -ENOMEM;
 212                 }
 213                 if (ipoib_ib_post_receive(dev, i)) {
 214                         ipoib_warn(priv, "ipoib_ib_post_receive failed for buf %d\n", i);
 215                         return -EIO;
 216                 }
 217         }
 218
 219         return 0;
 220 }
 221
 222 static void ipoib_ib_handle_rx_wc(struct net_device *dev, struct ib_wc *wc)
 223 {
 224         struct ipoib_dev_priv *priv = netdev_priv(dev);
 225         unsigned int wr_id = wc->wr_id & ~IPOIB_OP_RECV;
 226         struct sk_buff *skb;
 227         u64 mapping[IPOIB_UD_RX_SG];
 228
 229         ipoib_dbg_data(priv, "recv completion: id %d, status: %d\n",
 230                        wr_id, wc->status);
 231
 232         if (unlikely(wr_id >= ipoib_recvq_size)) {
 233                 ipoib_warn(priv, "recv completion event with wrid %d (> %d)\n",
 234                            wr_id, ipoib_recvq_size);
 235                 return;
 236         }
 237
 238         skb  = priv->rx_ring[wr_id].skb;
 239
 240         if (unlikely(wc->status != IB_WC_SUCCESS)) {
 241                 if (wc->status != IB_WC_WR_FLUSH_ERR)
 242                         ipoib_warn(priv, "failed recv event "
 243                                    "(status=%d, wrid=%d vend_err %x)\n",
 244                                    wc->status, wr_id, wc->vendor_err);
 245                 ipoib_ud_dma_unmap_rx(priv, priv->rx_ring[wr_id].mapping);
 246                 dev_kfree_skb_any(skb);
 247                 priv->rx_ring[wr_id].skb = NULL;
 248                 return;
 249         }
 250
 251         /*
 252          * Drop packets that this interface sent, ie multicast packets
 253          * that the HCA has replicated.
 254          */
 255         if (wc->slid == priv->local_lid && wc->src_qp == priv->qp->qp_num)
 256                 goto repost;
 257
 258         memcpy(mapping, priv->rx_ring[wr_id].mapping,
 259                IPOIB_UD_RX_SG * sizeof *mapping);
 260
 261         /*
 262          * If we can't allocate a new RX buffer, dump
 263          * this packet and reuse the old buffer.
 264          */
 265         if (unlikely(!ipoib_alloc_rx_skb(dev, wr_id))) {
 266                 ++dev->stats.rx_dropped;
 267                 goto repost;
 268         }
 269
 270         ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
 271                        wc->byte_len, wc->slid);
 272
 273         ipoib_ud_dma_unmap_rx(priv, mapping);
 274         ipoib_ud_skb_put_frags(priv, skb, wc->byte_len);
 275
 276         skb_pull(skb, IB_GRH_BYTES);
 277
 278         skb->protocol = ((struct ipoib_header *) skb->data)->proto;
 279         skb_reset_mac_header(skb);
 280         skb_pull(skb, IPOIB_ENCAP_LEN);
 281
 282         dev->last_rx = jiffies;
 283         ++dev->stats.rx_packets;
 284         dev->stats.rx_bytes += skb->len;
 285
 286         skb->dev = dev;
 287         /* XXX get correct PACKET_ type here */
 288         skb->pkt_type = PACKET_HOST;
 289
 290         if (test_bit(IPOIB_FLAG_CSUM, &priv->flags) && likely(wc->csum_ok))
 291                 skb->ip_summed = CHECKSUM_UNNECESSARY;
 292
 293         netif_receive_skb(skb);
 294
 295 repost:
 296         if (unlikely(ipoib_ib_post_receive(dev, wr_id)))
 297                 ipoib_warn(priv, "ipoib_ib_post_receive failed "
 298                            "for buf %d\n", wr_id);
 299 }
 300
 301 static int ipoib_dma_map_tx(struct ib_device *ca,
 302                             struct ipoib_tx_buf *tx_req)
 303 {
 304         struct sk_buff *skb = tx_req->skb;
 305         u64 *mapping = tx_req->mapping;
 306         int i;
 307         int off;
 308
 309         if (skb_headlen(skb)) {
 310                 mapping[0] = ib_dma_map_single(ca, skb->data, skb_headlen(skb),
 311                                                DMA_TO_DEVICE);
 312                 if (unlikely(ib_dma_mapping_error(ca, mapping[0])))
 313                         return -EIO;
 314
 315                 off = 1;
 316         } else
 317                 off = 0;
 318
 319         for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) {
 320                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 321                 mapping[i + off] = ib_dma_map_page(ca, frag->page,
 322                                                  frag->page_offset, frag->size,
 323                                                  DMA_TO_DEVICE);
 324                 if (unlikely(ib_dma_mapping_error(ca, mapping[i + off])))
 325                         goto partial_error;
 326         }
 327         return 0;
 328
 329 partial_error:
 330         for (; i > 0; --i) {
 331                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i - 1];
 332                 ib_dma_unmap_page(ca, mapping[i - !off], frag->size, DMA_TO_DEVICE);
 333         }
 334
 335         if (off)
 336                 ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE);
 337
 338         return -EIO;
 339 }
 340
 341 static void ipoib_dma_unmap_tx(struct ib_device *ca,
 342                                struct ipoib_tx_buf *tx_req)
 343 {
 344         struct sk_buff *skb = tx_req->skb;
 345         u64 *mapping = tx_req->mapping;
 346         int i;
 347         int off;
 348
 349         if (skb_headlen(skb)) {
 350                 ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE);
 351                 off = 1;
 352         } else
 353                 off = 0;
 354
 355         for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) {
 356                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 357                 ib_dma_unmap_page(ca, mapping[i + off], frag->size,
 358                                   DMA_TO_DEVICE);
 359         }
 360 }
 361
 362 static void ipoib_ib_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
 363 {
 364         struct ipoib_dev_priv *priv = netdev_priv(dev);
 365         unsigned int wr_id = wc->wr_id;
 366         struct ipoib_tx_buf *tx_req;
 367
 368         ipoib_dbg_data(priv, "send completion: id %d, status: %d\n",
 369                        wr_id, wc->status);
 370
 371         if (unlikely(wr_id >= ipoib_sendq_size)) {
 372                 ipoib_warn(priv, "send completion event with wrid %d (> %d)\n",
 373                            wr_id, ipoib_sendq_size);
 374                 return;
 375         }
 376
 377         tx_req = &priv->tx_ring[wr_id];
 378
 379         ipoib_dma_unmap_tx(priv->ca, tx_req);
 380
 381         ++dev->stats.tx_packets;
 382         dev->stats.tx_bytes += tx_req->skb->len;
 383
 384         dev_kfree_skb_any(tx_req->skb);
 385
 386         ++priv->tx_tail;
 387         if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
 388             netif_queue_stopped(dev) &&
 389             test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
 390                 netif_wake_queue(dev);
 391
 392         if (wc->status != IB_WC_SUCCESS &&
 393             wc->status != IB_WC_WR_FLUSH_ERR)
 394                 ipoib_warn(priv, "failed send event "
 395                            "(status=%d, wrid=%d vend_err %x)\n",
 396                            wc->status, wr_id, wc->vendor_err);
 397 }
 398
 399 static int poll_tx(struct ipoib_dev_priv *priv)
 400 {
 401         int n, i;
 402
 403         n = ib_poll_cq(priv->send_cq, MAX_SEND_CQE, priv->send_wc);
 404         for (i = 0; i < n; ++i)
 405                 ipoib_ib_handle_tx_wc(priv->dev, priv->send_wc + i);
 406
 407         return n == MAX_SEND_CQE;
 408 }
 409
 410 int ipoib_poll(struct napi_struct *napi, int budget)
 411 {
 412         struct ipoib_dev_priv *priv = container_of(napi, struct ipoib_dev_priv, napi);
 413         struct net_device *dev = priv->dev;
 414         int done;
 415         int t;
 416         int n, i;
 417
 418         done  = 0;
 419
 420 poll_more:
 421         while (done < budget) {
 422                 int max = (budget - done);
 423
 424                 t = min(IPOIB_NUM_WC, max);
 425                 n = ib_poll_cq(priv->recv_cq, t, priv->ibwc);
 426
 427                 for (i = 0; i < n; i++) {
 428                         struct ib_wc *wc = priv->ibwc + i;
 429
 430                         if (wc->wr_id & IPOIB_OP_RECV) {
 431                                 ++done;
 432                                 if (wc->wr_id & IPOIB_OP_CM)
 433                                         ipoib_cm_handle_rx_wc(dev, wc);
 434                                 else
 435                                         ipoib_ib_handle_rx_wc(dev, wc);
 436                         } else
 437                                 ipoib_cm_handle_tx_wc(priv->dev, wc);
 438                 }
 439
 440                 if (n != t)
 441                         break;
 442         }
 443
 444         if (done < budget) {
 445                 netif_rx_complete(dev, napi);
 446                 if (unlikely(ib_req_notify_cq(priv->recv_cq,
 447                                               IB_CQ_NEXT_COMP |
 448                                               IB_CQ_REPORT_MISSED_EVENTS)) &&
 449                     netif_rx_reschedule(dev, napi))
 450                         goto poll_more;
 451         }
 452
 453         return done;
 454 }
 455
 456 void ipoib_ib_completion(struct ib_cq *cq, void *dev_ptr)
 457 {
 458         struct net_device *dev = dev_ptr;
 459         struct ipoib_dev_priv *priv = netdev_priv(dev);
 460
 461         netif_rx_schedule(dev, &priv->napi);
 462 }
 463
 464 static void drain_tx_cq(struct net_device *dev)
 465 {
 466         struct ipoib_dev_priv *priv = netdev_priv(dev);
 467         unsigned long flags;
 468
 469         spin_lock_irqsave(&priv->tx_lock, flags);
 470         while (poll_tx(priv))
 471                 ; /* nothing */
 472
 473         if (netif_queue_stopped(dev))
 474                 mod_timer(&priv->poll_timer, jiffies + 1);
 475
 476         spin_unlock_irqrestore(&priv->tx_lock, flags);
 477 }
 478
 479 void ipoib_send_comp_handler(struct ib_cq *cq, void *dev_ptr)
 480 {
 481         drain_tx_cq((struct net_device *)dev_ptr);
 482 }
 483
 484 static inline int post_send(struct ipoib_dev_priv *priv,
 485                             unsigned int wr_id,
 486                             struct ib_ah *address, u32 qpn,
 487                             struct ipoib_tx_buf *tx_req,
 488                             void *head, int hlen)
 489 {
 490         struct ib_send_wr *bad_wr;
 491         int i, off;
 492         struct sk_buff *skb = tx_req->skb;
 493         skb_frag_t *frags = skb_shinfo(skb)->frags;
 494         int nr_frags = skb_shinfo(skb)->nr_frags;
 495         u64 *mapping = tx_req->mapping;
 496
 497         if (skb_headlen(skb)) {
 498                 priv->tx_sge[0].addr         = mapping[0];
 499                 priv->tx_sge[0].length       = skb_headlen(skb);
 500                 off = 1;
 501         } else
 502                 off = 0;
 503
 504         for (i = 0; i < nr_frags; ++i) {
 505                 priv->tx_sge[i + off].addr = mapping[i + off];
 506                 priv->tx_sge[i + off].length = frags[i].size;
 507         }
 508         priv->tx_wr.num_sge          = nr_frags + off;
 509         priv->tx_wr.wr_id            = wr_id;
 510         priv->tx_wr.wr.ud.remote_qpn = qpn;
 511         priv->tx_wr.wr.ud.ah         = address;
 512
 513         if (head) {
 514                 priv->tx_wr.wr.ud.mss    = skb_shinfo(skb)->gso_size;
 515                 priv->tx_wr.wr.ud.header = head;
 516                 priv->tx_wr.wr.ud.hlen   = hlen;
 517                 priv->tx_wr.opcode       = IB_WR_LSO;
 518         } else
 519                 priv->tx_wr.opcode       = IB_WR_SEND;
 520
 521         return ib_post_send(priv->qp, &priv->tx_wr, &bad_wr);
 522 }
 523
 524 void ipoib_send(struct net_device *dev, struct sk_buff *skb,
 525                 struct ipoib_ah *address, u32 qpn)
 526 {
 527         struct ipoib_dev_priv *priv = netdev_priv(dev);
 528         struct ipoib_tx_buf *tx_req;
 529         int hlen;
 530         void *phead;
 531
 532         if (skb_is_gso(skb)) {
 533                 hlen = skb_transport_offset(skb) + tcp_hdrlen(skb);
 534                 phead = skb->data;
 535                 if (unlikely(!skb_pull(skb, hlen))) {
 536                         ipoib_warn(priv, "linear data too small\n");
 537                         ++dev->stats.tx_dropped;
 538                         ++dev->stats.tx_errors;
 539                         dev_kfree_skb_any(skb);
 540                         return;
 541                 }
 542         } else {
 543                 if (unlikely(skb->len > priv->mcast_mtu + IPOIB_ENCAP_LEN)) {
 544                         ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
 545                                    skb->len, priv->mcast_mtu + IPOIB_ENCAP_LEN);
 546                         ++dev->stats.tx_dropped;
 547                         ++dev->stats.tx_errors;
 548                         ipoib_cm_skb_too_long(dev, skb, priv->mcast_mtu);
 549                         return;
 550                 }
 551                 phead = NULL;
 552                 hlen  = 0;
 553         }
 554
 555         ipoib_dbg_data(priv, "sending packet, length=%d address=%p qpn=0x%06x\n",
 556                        skb->len, address, qpn);
 557
 558         /*
 559          * We put the skb into the tx_ring _before_ we call post_send()
 560          * because it's entirely possible that the completion handler will
 561          * run before we execute anything after the post_send().  That
 562          * means we have to make sure everything is properly recorded and
 563          * our state is consistent before we call post_send().
 564          */
 565         tx_req = &priv->tx_ring[priv->tx_head & (ipoib_sendq_size - 1)];
 566         tx_req->skb = skb;
 567         if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req))) {
 568                 ++dev->stats.tx_errors;
 569                 dev_kfree_skb_any(skb);
 570                 return;
 571         }
 572
 573         if (skb->ip_summed == CHECKSUM_PARTIAL)
 574                 priv->tx_wr.send_flags |= IB_SEND_IP_CSUM;
 575         else
 576                 priv->tx_wr.send_flags &= ~IB_SEND_IP_CSUM;
 577
 578         if (++priv->tx_outstanding == ipoib_sendq_size) {
 579                 ipoib_dbg(priv, "TX ring full, stopping kernel net queue\n");
 580                 if (ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP))
 581                         ipoib_warn(priv, "request notify on send CQ failed\n");
 582                 netif_stop_queue(dev);
 583         }
 584
 585         if (unlikely(post_send(priv, priv->tx_head & (ipoib_sendq_size - 1),
 586                                address->ah, qpn, tx_req, phead, hlen))) {
 587                 ipoib_warn(priv, "post_send failed\n");
 588                 ++dev->stats.tx_errors;
 589                 --priv->tx_outstanding;
 590                 ipoib_dma_unmap_tx(priv->ca, tx_req);
 591                 dev_kfree_skb_any(skb);
 592                 if (netif_queue_stopped(dev))
 593                         netif_wake_queue(dev);
 594         } else {
 595                 dev->trans_start = jiffies;
 596
 597                 address->last_send = priv->tx_head;
 598                 ++priv->tx_head;
 599                 skb_orphan(skb);
 600
 601         }
 602
 603         if (unlikely(priv->tx_outstanding > MAX_SEND_CQE))
 604                 while (poll_tx(priv))
 605                         ; /* nothing */
 606 }
 607
 608 static void __ipoib_reap_ah(struct net_device *dev)
 609 {
 610         struct ipoib_dev_priv *priv = netdev_priv(dev);
 611         struct ipoib_ah *ah, *tah;
 612         LIST_HEAD(remove_list);
 613
 614         spin_lock_irq(&priv->tx_lock);
 615         spin_lock(&priv->lock);
 616         list_for_each_entry_safe(ah, tah, &priv->dead_ahs, list)
 617                 if ((int) priv->tx_tail - (int) ah->last_send >= 0) {
 618                         list_del(&ah->list);
 619                         ib_destroy_ah(ah->ah);
 620                         kfree(ah);
 621                 }
 622         spin_unlock(&priv->lock);
 623         spin_unlock_irq(&priv->tx_lock);
 624 }
 625
 626 void ipoib_reap_ah(struct work_struct *work)
 627 {
 628         struct ipoib_dev_priv *priv =
 629                 container_of(work, struct ipoib_dev_priv, ah_reap_task.work);
 630         struct net_device *dev = priv->dev;
 631
 632         __ipoib_reap_ah(dev);
 633
 634         if (!test_bit(IPOIB_STOP_REAPER, &priv->flags))
 635                 queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task,
 636                                    round_jiffies_relative(HZ));
 637 }
 638
 639 static void ipoib_ib_tx_timer_func(unsigned long ctx)
 640 {
 641         drain_tx_cq((struct net_device *)ctx);
 642 }
 643
 644 int ipoib_ib_dev_open(struct net_device *dev)
 645 {
 646         struct ipoib_dev_priv *priv = netdev_priv(dev);
 647         int ret;
 648
 649         if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &priv->pkey_index)) {
 650                 ipoib_warn(priv, "P_Key 0x%04x not found\n", priv->pkey);
 651                 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 652                 return -1;
 653         }
 654         set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 655
 656         ret = ipoib_init_qp(dev);
 657         if (ret) {
 658                 ipoib_warn(priv, "ipoib_init_qp returned %d\n", ret);
 659                 return -1;
 660         }
 661
 662         ret = ipoib_ib_post_receives(dev);
 663         if (ret) {
 664                 ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret);
 665                 ipoib_ib_dev_stop(dev, 1);
 666                 return -1;
 667         }
 668
 669         ret = ipoib_cm_dev_open(dev);
 670         if (ret) {
 671                 ipoib_warn(priv, "ipoib_cm_dev_open returned %d\n", ret);
 672                 ipoib_ib_dev_stop(dev, 1);
 673                 return -1;
 674         }
 675
 676         clear_bit(IPOIB_STOP_REAPER, &priv->flags);
 677         queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task,
 678                            round_jiffies_relative(HZ));
 679
 680         init_timer(&priv->poll_timer);
 681         priv->poll_timer.function = ipoib_ib_tx_timer_func;
 682         priv->poll_timer.data = (unsigned long)dev;
 683
 684         set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
 685
 686         return 0;
 687 }
 688
 689 static void ipoib_pkey_dev_check_presence(struct net_device *dev)
 690 {
 691         struct ipoib_dev_priv *priv = netdev_priv(dev);
 692         u16 pkey_index = 0;
 693
 694         if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &pkey_index))
 695                 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 696         else
 697                 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 698 }
 699
 700 int ipoib_ib_dev_up(struct net_device *dev)
 701 {
 702         struct ipoib_dev_priv *priv = netdev_priv(dev);
 703
 704         ipoib_pkey_dev_check_presence(dev);
 705
 706         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
 707                 ipoib_dbg(priv, "PKEY is not assigned.\n");
 708                 return 0;
 709         }
 710
 711         set_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
 712
 713         return ipoib_mcast_start_thread(dev);
 714 }
 715
 716 int ipoib_ib_dev_down(struct net_device *dev, int flush)
 717 {
 718         struct ipoib_dev_priv *priv = netdev_priv(dev);
 719
 720         ipoib_dbg(priv, "downing ib_dev\n");
 721
 722         clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
 723         netif_carrier_off(dev);
 724
 725         /* Shutdown the P_Key thread if still active */
 726         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
 727                 mutex_lock(&pkey_mutex);
 728                 set_bit(IPOIB_PKEY_STOP, &priv->flags);
 729                 cancel_delayed_work(&priv->pkey_poll_task);
 730                 mutex_unlock(&pkey_mutex);
 731                 if (flush)
 732                         flush_workqueue(ipoib_workqueue);
 733         }
 734
 735         ipoib_mcast_stop_thread(dev, flush);
 736         ipoib_mcast_dev_flush(dev);
 737
 738         ipoib_flush_paths(dev);
 739
 740         return 0;
 741 }
 742
 743 static int recvs_pending(struct net_device *dev)
 744 {
 745         struct ipoib_dev_priv *priv = netdev_priv(dev);
 746         int pending = 0;
 747         int i;
 748
 749         for (i = 0; i < ipoib_recvq_size; ++i)
 750                 if (priv->rx_ring[i].skb)
 751                         ++pending;
 752
 753         return pending;
 754 }
 755
 756 void ipoib_drain_cq(struct net_device *dev)
 757 {
 758         struct ipoib_dev_priv *priv = netdev_priv(dev);
 759         int i, n;
 760         do {
 761                 n = ib_poll_cq(priv->recv_cq, IPOIB_NUM_WC, priv->ibwc);
 762                 for (i = 0; i < n; ++i) {
 763                         /*
 764                          * Convert any successful completions to flush
 765                          * errors to avoid passing packets up the
 766                          * stack after bringing the device down.
 767                          */
 768                         if (priv->ibwc[i].status == IB_WC_SUCCESS)
 769                                 priv->ibwc[i].status = IB_WC_WR_FLUSH_ERR;
 770
 771                         if (priv->ibwc[i].wr_id & IPOIB_OP_RECV) {
 772                                 if (priv->ibwc[i].wr_id & IPOIB_OP_CM)
 773                                         ipoib_cm_handle_rx_wc(dev, priv->ibwc + i);
 774                                 else
 775                                         ipoib_ib_handle_rx_wc(dev, priv->ibwc + i);
 776                         } else
 777                                 ipoib_cm_handle_tx_wc(dev, priv->ibwc + i);
 778                 }
 779         } while (n == IPOIB_NUM_WC);
 780
 781         while (poll_tx(priv))
 782                 ; /* nothing */
 783 }
 784
 785 int ipoib_ib_dev_stop(struct net_device *dev, int flush)
 786 {
 787         struct ipoib_dev_priv *priv = netdev_priv(dev);
 788         struct ib_qp_attr qp_attr;
 789         unsigned long begin;
 790         struct ipoib_tx_buf *tx_req;
 791         int i;
 792
 793         clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
 794
 795         ipoib_cm_dev_stop(dev);
 796
 797         /*
 798          * Move our QP to the error state and then reinitialize in
 799          * when all work requests have completed or have been flushed.
 800          */
 801         qp_attr.qp_state = IB_QPS_ERR;
 802         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
 803                 ipoib_warn(priv, "Failed to modify QP to ERROR state\n");
 804
 805         /* Wait for all sends and receives to complete */
 806         begin = jiffies;
 807
 808         while (priv->tx_head != priv->tx_tail || recvs_pending(dev)) {
 809                 if (time_after(jiffies, begin + 5 * HZ)) {
 810                         ipoib_warn(priv, "timing out; %d sends %d receives not completed\n",
 811                                    priv->tx_head - priv->tx_tail, recvs_pending(dev));
 812
 813                         /*
 814                          * assume the HW is wedged and just free up
 815                          * all our pending work requests.
 816                          */
 817                         while ((int) priv->tx_tail - (int) priv->tx_head < 0) {
 818                                 tx_req = &priv->tx_ring[priv->tx_tail &
 819                                                         (ipoib_sendq_size - 1)];
 820                                 ipoib_dma_unmap_tx(priv->ca, tx_req);
 821                                 dev_kfree_skb_any(tx_req->skb);
 822                                 ++priv->tx_tail;
 823                                 --priv->tx_outstanding;
 824                         }
 825
 826                         for (i = 0; i < ipoib_recvq_size; ++i) {
 827                                 struct ipoib_rx_buf *rx_req;
 828
 829                                 rx_req = &priv->rx_ring[i];
 830                                 if (!rx_req->skb)
 831                                         continue;
 832                                 ipoib_ud_dma_unmap_rx(priv,
 833                                                       priv->rx_ring[i].mapping);
 834                                 dev_kfree_skb_any(rx_req->skb);
 835                                 rx_req->skb = NULL;
 836                         }
 837
 838                         goto timeout;
 839                 }
 840
 841                 ipoib_drain_cq(dev);
 842
 843                 msleep(1);
 844         }
 845
 846         ipoib_dbg(priv, "All sends and receives done.\n");
 847
 848 timeout:
 849         del_timer_sync(&priv->poll_timer);
 850         qp_attr.qp_state = IB_QPS_RESET;
 851         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
 852                 ipoib_warn(priv, "Failed to modify QP to RESET state\n");
 853
 854         /* Wait for all AHs to be reaped */
 855         set_bit(IPOIB_STOP_REAPER, &priv->flags);
 856         cancel_delayed_work(&priv->ah_reap_task);
 857         if (flush)
 858                 flush_workqueue(ipoib_workqueue);
 859
 860         begin = jiffies;
 861
 862         while (!list_empty(&priv->dead_ahs)) {
 863                 __ipoib_reap_ah(dev);
 864
 865                 if (time_after(jiffies, begin + HZ)) {
 866                         ipoib_warn(priv, "timing out; will leak address handles\n");
 867                         break;
 868                 }
 869
 870                 msleep(1);
 871         }
 872
 873         ib_req_notify_cq(priv->recv_cq, IB_CQ_NEXT_COMP);
 874
 875         return 0;
 876 }
 877
 878 int ipoib_ib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
 879 {
 880         struct ipoib_dev_priv *priv = netdev_priv(dev);
 881
 882         priv->ca = ca;
 883         priv->port = port;
 884         priv->qp = NULL;
 885
 886         if (ipoib_transport_dev_init(dev, ca)) {
 887                 printk(KERN_WARNING "%s: ipoib_transport_dev_init failed\n", ca->name);
 888                 return -ENODEV;
 889         }
 890
 891         if (dev->flags & IFF_UP) {
 892                 if (ipoib_ib_dev_open(dev)) {
 893                         ipoib_transport_dev_cleanup(dev);
 894                         return -ENODEV;
 895                 }
 896         }
 897
 898         return 0;
 899 }
 900
 901 static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv, int pkey_event)
 902 {
 903         struct ipoib_dev_priv *cpriv;
 904         struct net_device *dev = priv->dev;
 905         u16 new_index;
 906
 907         mutex_lock(&priv->vlan_mutex);
 908
 909         /*
 910          * Flush any child interfaces too -- they might be up even if
 911          * the parent is down.
 912          */
 913         list_for_each_entry(cpriv, &priv->child_intfs, list)
 914                 __ipoib_ib_dev_flush(cpriv, pkey_event);
 915
 916         mutex_unlock(&priv->vlan_mutex);
 917
 918         if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) {
 919                 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n");
 920                 return;
 921         }
 922
 923         if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
 924                 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n");
 925                 return;
 926         }
 927
 928         if (pkey_event) {
 929                 if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &new_index)) {
 930                         clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 931                         ipoib_ib_dev_down(dev, 0);
 932                         ipoib_ib_dev_stop(dev, 0);
 933                         if (ipoib_pkey_dev_delay_open(dev))
 934                                 return;
 935                 }
 936
 937                 /* restart QP only if P_Key index is changed */
 938                 if (test_and_set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags) &&
 939                     new_index == priv->pkey_index) {
 940                         ipoib_dbg(priv, "Not flushing - P_Key index not changed.\n");
 941                         return;
 942                 }
 943                 priv->pkey_index = new_index;
 944         }
 945
 946         ipoib_dbg(priv, "flushing\n");
 947
 948         ipoib_ib_dev_down(dev, 0);
 949
 950         if (pkey_event) {
 951                 ipoib_ib_dev_stop(dev, 0);
 952                 ipoib_ib_dev_open(dev);
 953         }
 954
 955         /*
 956          * The device could have been brought down between the start and when
 957          * we get here, don't bring it back up if it's not configured up
 958          */
 959         if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
 960                 ipoib_ib_dev_up(dev);
 961                 ipoib_mcast_restart_task(&priv->restart_task);
 962         }
 963 }
 964
 965 void ipoib_ib_dev_flush(struct work_struct *work)
 966 {
 967         struct ipoib_dev_priv *priv =
 968                 container_of(work, struct ipoib_dev_priv, flush_task);
 969
 970         ipoib_dbg(priv, "Flushing %s\n", priv->dev->name);
 971         __ipoib_ib_dev_flush(priv, 0);
 972 }
 973
 974 void ipoib_pkey_event(struct work_struct *work)
 975 {
 976         struct ipoib_dev_priv *priv =
 977                 container_of(work, struct ipoib_dev_priv, pkey_event_task);
 978
 979         ipoib_dbg(priv, "Flushing %s and restarting its QP\n", priv->dev->name);
 980         __ipoib_ib_dev_flush(priv, 1);
 981 }
 982
 983 void ipoib_ib_dev_cleanup(struct net_device *dev)
 984 {
 985         struct ipoib_dev_priv *priv = netdev_priv(dev);
 986
 987         ipoib_dbg(priv, "cleaning up ib_dev\n");
 988
 989         ipoib_mcast_stop_thread(dev, 1);
 990         ipoib_mcast_dev_flush(dev);
 991
 992         ipoib_transport_dev_cleanup(dev);
 993 }
 994
 995 /*
 996  * Delayed P_Key Assigment Interim Support
 997  *
 998  * The following is initial implementation of delayed P_Key assigment
 999  * mechanism. It is using the same approach implemented for the multicast
1000  * group join. The single goal of this implementation is to quickly address
1001  * Bug #2507. This implementation will probably be removed when the P_Key
1002  * change async notification is available.
1003  */
1004
1005 void ipoib_pkey_poll(struct work_struct *work)
1006 {
1007         struct ipoib_dev_priv *priv =
1008                 container_of(work, struct ipoib_dev_priv, pkey_poll_task.work);
1009         struct net_device *dev = priv->dev;
1010
1011         ipoib_pkey_dev_check_presence(dev);
1012
1013         if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags))
1014                 ipoib_open(dev);
1015         else {
1016                 mutex_lock(&pkey_mutex);
1017                 if (!test_bit(IPOIB_PKEY_STOP, &priv->flags))
1018                         queue_delayed_work(ipoib_workqueue,
1019                                            &priv->pkey_poll_task,
1020                                            HZ);
1021                 mutex_unlock(&pkey_mutex);
1022         }
1023 }
1024
1025 int ipoib_pkey_dev_delay_open(struct net_device *dev)
1026 {
1027         struct ipoib_dev_priv *priv = netdev_priv(dev);
1028
1029         /* Look for the interface pkey value in the IB Port P_Key table and */
1030         /* set the interface pkey assigment flag                            */
1031         ipoib_pkey_dev_check_presence(dev);
1032
1033         /* P_Key value not assigned yet - start polling */
1034         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
1035                 mutex_lock(&pkey_mutex);
1036                 clear_bit(IPOIB_PKEY_STOP, &priv->flags);
1037                 queue_delayed_work(ipoib_workqueue,
1038                                    &priv->pkey_poll_task,
1039                                    HZ);
1040                 mutex_unlock(&pkey_mutex);
1041                 return 1;
1042         }
1043
1044         return 0;
1045 }