err.no 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 inline int post_send(struct ipoib_dev_priv *priv,
 465                             unsigned int wr_id,
 466                             struct ib_ah *address, u32 qpn,
 467                             struct ipoib_tx_buf *tx_req,
 468                             void *head, int hlen)
 469 {
 470         struct ib_send_wr *bad_wr;
 471         int i, off;
 472         struct sk_buff *skb = tx_req->skb;
 473         skb_frag_t *frags = skb_shinfo(skb)->frags;
 474         int nr_frags = skb_shinfo(skb)->nr_frags;
 475         u64 *mapping = tx_req->mapping;
 476
 477         if (skb_headlen(skb)) {
 478                 priv->tx_sge[0].addr         = mapping[0];
 479                 priv->tx_sge[0].length       = skb_headlen(skb);
 480                 off = 1;
 481         } else
 482                 off = 0;
 483
 484         for (i = 0; i < nr_frags; ++i) {
 485                 priv->tx_sge[i + off].addr = mapping[i + off];
 486                 priv->tx_sge[i + off].length = frags[i].size;
 487         }
 488         priv->tx_wr.num_sge          = nr_frags + off;
 489         priv->tx_wr.wr_id            = wr_id;
 490         priv->tx_wr.wr.ud.remote_qpn = qpn;
 491         priv->tx_wr.wr.ud.ah         = address;
 492
 493         if (head) {
 494                 priv->tx_wr.wr.ud.mss    = skb_shinfo(skb)->gso_size;
 495                 priv->tx_wr.wr.ud.header = head;
 496                 priv->tx_wr.wr.ud.hlen   = hlen;
 497                 priv->tx_wr.opcode       = IB_WR_LSO;
 498         } else
 499                 priv->tx_wr.opcode       = IB_WR_SEND;
 500
 501         return ib_post_send(priv->qp, &priv->tx_wr, &bad_wr);
 502 }
 503
 504 void ipoib_send(struct net_device *dev, struct sk_buff *skb,
 505                 struct ipoib_ah *address, u32 qpn)
 506 {
 507         struct ipoib_dev_priv *priv = netdev_priv(dev);
 508         struct ipoib_tx_buf *tx_req;
 509         int hlen;
 510         void *phead;
 511
 512         if (skb_is_gso(skb)) {
 513                 hlen = skb_transport_offset(skb) + tcp_hdrlen(skb);
 514                 phead = skb->data;
 515                 if (unlikely(!skb_pull(skb, hlen))) {
 516                         ipoib_warn(priv, "linear data too small\n");
 517                         ++dev->stats.tx_dropped;
 518                         ++dev->stats.tx_errors;
 519                         dev_kfree_skb_any(skb);
 520                         return;
 521                 }
 522         } else {
 523                 if (unlikely(skb->len > priv->mcast_mtu + IPOIB_ENCAP_LEN)) {
 524                         ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
 525                                    skb->len, priv->mcast_mtu + IPOIB_ENCAP_LEN);
 526                         ++dev->stats.tx_dropped;
 527                         ++dev->stats.tx_errors;
 528                         ipoib_cm_skb_too_long(dev, skb, priv->mcast_mtu);
 529                         return;
 530                 }
 531                 phead = NULL;
 532                 hlen  = 0;
 533         }
 534
 535         ipoib_dbg_data(priv, "sending packet, length=%d address=%p qpn=0x%06x\n",
 536                        skb->len, address, qpn);
 537
 538         /*
 539          * We put the skb into the tx_ring _before_ we call post_send()
 540          * because it's entirely possible that the completion handler will
 541          * run before we execute anything after the post_send().  That
 542          * means we have to make sure everything is properly recorded and
 543          * our state is consistent before we call post_send().
 544          */
 545         tx_req = &priv->tx_ring[priv->tx_head & (ipoib_sendq_size - 1)];
 546         tx_req->skb = skb;
 547         if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req))) {
 548                 ++dev->stats.tx_errors;
 549                 dev_kfree_skb_any(skb);
 550                 return;
 551         }
 552
 553         if (skb->ip_summed == CHECKSUM_PARTIAL)
 554                 priv->tx_wr.send_flags |= IB_SEND_IP_CSUM;
 555         else
 556                 priv->tx_wr.send_flags &= ~IB_SEND_IP_CSUM;
 557
 558         if (unlikely(post_send(priv, priv->tx_head & (ipoib_sendq_size - 1),
 559                                address->ah, qpn, tx_req, phead, hlen))) {
 560                 ipoib_warn(priv, "post_send failed\n");
 561                 ++dev->stats.tx_errors;
 562                 ipoib_dma_unmap_tx(priv->ca, tx_req);
 563                 dev_kfree_skb_any(skb);
 564         } else {
 565                 dev->trans_start = jiffies;
 566
 567                 address->last_send = priv->tx_head;
 568                 ++priv->tx_head;
 569                 skb_orphan(skb);
 570
 571                 if (++priv->tx_outstanding == ipoib_sendq_size) {
 572                         ipoib_dbg(priv, "TX ring full, stopping kernel net queue\n");
 573                         netif_stop_queue(dev);
 574                 }
 575         }
 576
 577         if (unlikely(priv->tx_outstanding > MAX_SEND_CQE))
 578                 poll_tx(priv);
 579 }
 580
 581 static void __ipoib_reap_ah(struct net_device *dev)
 582 {
 583         struct ipoib_dev_priv *priv = netdev_priv(dev);
 584         struct ipoib_ah *ah, *tah;
 585         LIST_HEAD(remove_list);
 586
 587         spin_lock_irq(&priv->tx_lock);
 588         spin_lock(&priv->lock);
 589         list_for_each_entry_safe(ah, tah, &priv->dead_ahs, list)
 590                 if ((int) priv->tx_tail - (int) ah->last_send >= 0) {
 591                         list_del(&ah->list);
 592                         ib_destroy_ah(ah->ah);
 593                         kfree(ah);
 594                 }
 595         spin_unlock(&priv->lock);
 596         spin_unlock_irq(&priv->tx_lock);
 597 }
 598
 599 void ipoib_reap_ah(struct work_struct *work)
 600 {
 601         struct ipoib_dev_priv *priv =
 602                 container_of(work, struct ipoib_dev_priv, ah_reap_task.work);
 603         struct net_device *dev = priv->dev;
 604
 605         __ipoib_reap_ah(dev);
 606
 607         if (!test_bit(IPOIB_STOP_REAPER, &priv->flags))
 608                 queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task,
 609                                    round_jiffies_relative(HZ));
 610 }
 611
 612 int ipoib_ib_dev_open(struct net_device *dev)
 613 {
 614         struct ipoib_dev_priv *priv = netdev_priv(dev);
 615         int ret;
 616
 617         if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &priv->pkey_index)) {
 618                 ipoib_warn(priv, "P_Key 0x%04x not found\n", priv->pkey);
 619                 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 620                 return -1;
 621         }
 622         set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 623
 624         ret = ipoib_init_qp(dev);
 625         if (ret) {
 626                 ipoib_warn(priv, "ipoib_init_qp returned %d\n", ret);
 627                 return -1;
 628         }
 629
 630         ret = ipoib_ib_post_receives(dev);
 631         if (ret) {
 632                 ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret);
 633                 ipoib_ib_dev_stop(dev, 1);
 634                 return -1;
 635         }
 636
 637         ret = ipoib_cm_dev_open(dev);
 638         if (ret) {
 639                 ipoib_warn(priv, "ipoib_cm_dev_open returned %d\n", ret);
 640                 ipoib_ib_dev_stop(dev, 1);
 641                 return -1;
 642         }
 643
 644         clear_bit(IPOIB_STOP_REAPER, &priv->flags);
 645         queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task,
 646                            round_jiffies_relative(HZ));
 647
 648         set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
 649
 650         return 0;
 651 }
 652
 653 static void ipoib_pkey_dev_check_presence(struct net_device *dev)
 654 {
 655         struct ipoib_dev_priv *priv = netdev_priv(dev);
 656         u16 pkey_index = 0;
 657
 658         if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &pkey_index))
 659                 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 660         else
 661                 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 662 }
 663
 664 int ipoib_ib_dev_up(struct net_device *dev)
 665 {
 666         struct ipoib_dev_priv *priv = netdev_priv(dev);
 667
 668         ipoib_pkey_dev_check_presence(dev);
 669
 670         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
 671                 ipoib_dbg(priv, "PKEY is not assigned.\n");
 672                 return 0;
 673         }
 674
 675         set_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
 676
 677         return ipoib_mcast_start_thread(dev);
 678 }
 679
 680 int ipoib_ib_dev_down(struct net_device *dev, int flush)
 681 {
 682         struct ipoib_dev_priv *priv = netdev_priv(dev);
 683
 684         ipoib_dbg(priv, "downing ib_dev\n");
 685
 686         clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
 687         netif_carrier_off(dev);
 688
 689         /* Shutdown the P_Key thread if still active */
 690         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
 691                 mutex_lock(&pkey_mutex);
 692                 set_bit(IPOIB_PKEY_STOP, &priv->flags);
 693                 cancel_delayed_work(&priv->pkey_poll_task);
 694                 mutex_unlock(&pkey_mutex);
 695                 if (flush)
 696                         flush_workqueue(ipoib_workqueue);
 697         }
 698
 699         ipoib_mcast_stop_thread(dev, flush);
 700         ipoib_mcast_dev_flush(dev);
 701
 702         ipoib_flush_paths(dev);
 703
 704         return 0;
 705 }
 706
 707 static int recvs_pending(struct net_device *dev)
 708 {
 709         struct ipoib_dev_priv *priv = netdev_priv(dev);
 710         int pending = 0;
 711         int i;
 712
 713         for (i = 0; i < ipoib_recvq_size; ++i)
 714                 if (priv->rx_ring[i].skb)
 715                         ++pending;
 716
 717         return pending;
 718 }
 719
 720 void ipoib_drain_cq(struct net_device *dev)
 721 {
 722         struct ipoib_dev_priv *priv = netdev_priv(dev);
 723         int i, n;
 724         do {
 725                 n = ib_poll_cq(priv->recv_cq, IPOIB_NUM_WC, priv->ibwc);
 726                 for (i = 0; i < n; ++i) {
 727                         /*
 728                          * Convert any successful completions to flush
 729                          * errors to avoid passing packets up the
 730                          * stack after bringing the device down.
 731                          */
 732                         if (priv->ibwc[i].status == IB_WC_SUCCESS)
 733                                 priv->ibwc[i].status = IB_WC_WR_FLUSH_ERR;
 734
 735                         if (priv->ibwc[i].wr_id & IPOIB_OP_RECV) {
 736                                 if (priv->ibwc[i].wr_id & IPOIB_OP_CM)
 737                                         ipoib_cm_handle_rx_wc(dev, priv->ibwc + i);
 738                                 else
 739                                         ipoib_ib_handle_rx_wc(dev, priv->ibwc + i);
 740                         } else
 741                                 ipoib_cm_handle_tx_wc(dev, priv->ibwc + i);
 742                 }
 743         } while (n == IPOIB_NUM_WC);
 744
 745         while (poll_tx(priv))
 746                 ; /* nothing */
 747 }
 748
 749 int ipoib_ib_dev_stop(struct net_device *dev, int flush)
 750 {
 751         struct ipoib_dev_priv *priv = netdev_priv(dev);
 752         struct ib_qp_attr qp_attr;
 753         unsigned long begin;
 754         struct ipoib_tx_buf *tx_req;
 755         int i;
 756
 757         clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
 758
 759         ipoib_cm_dev_stop(dev);
 760
 761         /*
 762          * Move our QP to the error state and then reinitialize in
 763          * when all work requests have completed or have been flushed.
 764          */
 765         qp_attr.qp_state = IB_QPS_ERR;
 766         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
 767                 ipoib_warn(priv, "Failed to modify QP to ERROR state\n");
 768
 769         /* Wait for all sends and receives to complete */
 770         begin = jiffies;
 771
 772         while (priv->tx_head != priv->tx_tail || recvs_pending(dev)) {
 773                 if (time_after(jiffies, begin + 5 * HZ)) {
 774                         ipoib_warn(priv, "timing out; %d sends %d receives not completed\n",
 775                                    priv->tx_head - priv->tx_tail, recvs_pending(dev));
 776
 777                         /*
 778                          * assume the HW is wedged and just free up
 779                          * all our pending work requests.
 780                          */
 781                         while ((int) priv->tx_tail - (int) priv->tx_head < 0) {
 782                                 tx_req = &priv->tx_ring[priv->tx_tail &
 783                                                         (ipoib_sendq_size - 1)];
 784                                 ipoib_dma_unmap_tx(priv->ca, tx_req);
 785                                 dev_kfree_skb_any(tx_req->skb);
 786                                 ++priv->tx_tail;
 787                                 --priv->tx_outstanding;
 788                         }
 789
 790                         for (i = 0; i < ipoib_recvq_size; ++i) {
 791                                 struct ipoib_rx_buf *rx_req;
 792
 793                                 rx_req = &priv->rx_ring[i];
 794                                 if (!rx_req->skb)
 795                                         continue;
 796                                 ipoib_ud_dma_unmap_rx(priv,
 797                                                       priv->rx_ring[i].mapping);
 798                                 dev_kfree_skb_any(rx_req->skb);
 799                                 rx_req->skb = NULL;
 800                         }
 801
 802                         goto timeout;
 803                 }
 804
 805                 ipoib_drain_cq(dev);
 806
 807                 msleep(1);
 808         }
 809
 810         ipoib_dbg(priv, "All sends and receives done.\n");
 811
 812 timeout:
 813         qp_attr.qp_state = IB_QPS_RESET;
 814         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
 815                 ipoib_warn(priv, "Failed to modify QP to RESET state\n");
 816
 817         /* Wait for all AHs to be reaped */
 818         set_bit(IPOIB_STOP_REAPER, &priv->flags);
 819         cancel_delayed_work(&priv->ah_reap_task);
 820         if (flush)
 821                 flush_workqueue(ipoib_workqueue);
 822
 823         begin = jiffies;
 824
 825         while (!list_empty(&priv->dead_ahs)) {
 826                 __ipoib_reap_ah(dev);
 827
 828                 if (time_after(jiffies, begin + HZ)) {
 829                         ipoib_warn(priv, "timing out; will leak address handles\n");
 830                         break;
 831                 }
 832
 833                 msleep(1);
 834         }
 835
 836         ib_req_notify_cq(priv->recv_cq, IB_CQ_NEXT_COMP);
 837
 838         return 0;
 839 }
 840
 841 int ipoib_ib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
 842 {
 843         struct ipoib_dev_priv *priv = netdev_priv(dev);
 844
 845         priv->ca = ca;
 846         priv->port = port;
 847         priv->qp = NULL;
 848
 849         if (ipoib_transport_dev_init(dev, ca)) {
 850                 printk(KERN_WARNING "%s: ipoib_transport_dev_init failed\n", ca->name);
 851                 return -ENODEV;
 852         }
 853
 854         if (dev->flags & IFF_UP) {
 855                 if (ipoib_ib_dev_open(dev)) {
 856                         ipoib_transport_dev_cleanup(dev);
 857                         return -ENODEV;
 858                 }
 859         }
 860
 861         return 0;
 862 }
 863
 864 static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv, int pkey_event)
 865 {
 866         struct ipoib_dev_priv *cpriv;
 867         struct net_device *dev = priv->dev;
 868         u16 new_index;
 869
 870         mutex_lock(&priv->vlan_mutex);
 871
 872         /*
 873          * Flush any child interfaces too -- they might be up even if
 874          * the parent is down.
 875          */
 876         list_for_each_entry(cpriv, &priv->child_intfs, list)
 877                 __ipoib_ib_dev_flush(cpriv, pkey_event);
 878
 879         mutex_unlock(&priv->vlan_mutex);
 880
 881         if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) {
 882                 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n");
 883                 return;
 884         }
 885
 886         if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
 887                 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n");
 888                 return;
 889         }
 890
 891         if (pkey_event) {
 892                 if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &new_index)) {
 893                         clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 894                         ipoib_ib_dev_down(dev, 0);
 895                         ipoib_ib_dev_stop(dev, 0);
 896                         if (ipoib_pkey_dev_delay_open(dev))
 897                                 return;
 898                 }
 899
 900                 /* restart QP only if P_Key index is changed */
 901                 if (test_and_set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags) &&
 902                     new_index == priv->pkey_index) {
 903                         ipoib_dbg(priv, "Not flushing - P_Key index not changed.\n");
 904                         return;
 905                 }
 906                 priv->pkey_index = new_index;
 907         }
 908
 909         ipoib_dbg(priv, "flushing\n");
 910
 911         ipoib_ib_dev_down(dev, 0);
 912
 913         if (pkey_event) {
 914                 ipoib_ib_dev_stop(dev, 0);
 915                 ipoib_ib_dev_open(dev);
 916         }
 917
 918         /*
 919          * The device could have been brought down between the start and when
 920          * we get here, don't bring it back up if it's not configured up
 921          */
 922         if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
 923                 ipoib_ib_dev_up(dev);
 924                 ipoib_mcast_restart_task(&priv->restart_task);
 925         }
 926 }
 927
 928 void ipoib_ib_dev_flush(struct work_struct *work)
 929 {
 930         struct ipoib_dev_priv *priv =
 931                 container_of(work, struct ipoib_dev_priv, flush_task);
 932
 933         ipoib_dbg(priv, "Flushing %s\n", priv->dev->name);
 934         __ipoib_ib_dev_flush(priv, 0);
 935 }
 936
 937 void ipoib_pkey_event(struct work_struct *work)
 938 {
 939         struct ipoib_dev_priv *priv =
 940                 container_of(work, struct ipoib_dev_priv, pkey_event_task);
 941
 942         ipoib_dbg(priv, "Flushing %s and restarting its QP\n", priv->dev->name);
 943         __ipoib_ib_dev_flush(priv, 1);
 944 }
 945
 946 void ipoib_ib_dev_cleanup(struct net_device *dev)
 947 {
 948         struct ipoib_dev_priv *priv = netdev_priv(dev);
 949
 950         ipoib_dbg(priv, "cleaning up ib_dev\n");
 951
 952         ipoib_mcast_stop_thread(dev, 1);
 953         ipoib_mcast_dev_flush(dev);
 954
 955         ipoib_transport_dev_cleanup(dev);
 956 }
 957
 958 /*
 959  * Delayed P_Key Assigment Interim Support
 960  *
 961  * The following is initial implementation of delayed P_Key assigment
 962  * mechanism. It is using the same approach implemented for the multicast
 963  * group join. The single goal of this implementation is to quickly address
 964  * Bug #2507. This implementation will probably be removed when the P_Key
 965  * change async notification is available.
 966  */
 967
 968 void ipoib_pkey_poll(struct work_struct *work)
 969 {
 970         struct ipoib_dev_priv *priv =
 971                 container_of(work, struct ipoib_dev_priv, pkey_poll_task.work);
 972         struct net_device *dev = priv->dev;
 973
 974         ipoib_pkey_dev_check_presence(dev);
 975
 976         if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags))
 977                 ipoib_open(dev);
 978         else {
 979                 mutex_lock(&pkey_mutex);
 980                 if (!test_bit(IPOIB_PKEY_STOP, &priv->flags))
 981                         queue_delayed_work(ipoib_workqueue,
 982                                            &priv->pkey_poll_task,
 983                                            HZ);
 984                 mutex_unlock(&pkey_mutex);
 985         }
 986 }
 987
 988 int ipoib_pkey_dev_delay_open(struct net_device *dev)
 989 {
 990         struct ipoib_dev_priv *priv = netdev_priv(dev);
 991
 992         /* Look for the interface pkey value in the IB Port P_Key table and */
 993         /* set the interface pkey assigment flag                            */
 994         ipoib_pkey_dev_check_presence(dev);
 995
 996         /* P_Key value not assigned yet - start polling */
 997         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
 998                 mutex_lock(&pkey_mutex);
 999                 clear_bit(IPOIB_PKEY_STOP, &priv->flags);
1000                 queue_delayed_work(ipoib_workqueue,
1001                                    &priv->pkey_poll_task,
1002                                    HZ);
1003                 mutex_unlock(&pkey_mutex);
1004                 return 1;
1005         }
1006
1007         return 0;
1008 }