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   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/dma-mapping.h>
  38 #include <linux/slab.h>
  39
  40 #include <linux/ip.h>
  41 #include <linux/tcp.h>
  42
  43 #include "ipoib.h"
  44
  45 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA
  46 static int data_debug_level;
  47
  48 module_param(data_debug_level, int, 0644);
  49 MODULE_PARM_DESC(data_debug_level,
  50                  "Enable data path debug tracing if > 0");
  51 #endif
  52
  53 static DEFINE_MUTEX(pkey_mutex);
  54
  55 struct ipoib_ah *ipoib_create_ah(struct net_device *dev,
  56                                  struct ib_pd *pd, struct ib_ah_attr *attr)
  57 {
  58         struct ipoib_ah *ah;
  59
  60         ah = kmalloc(sizeof *ah, GFP_KERNEL);
  61         if (!ah)
  62                 return NULL;
  63
  64         ah->dev       = dev;
  65         ah->last_send = 0;
  66         kref_init(&ah->ref);
  67
  68         ah->ah = ib_create_ah(pd, attr);
  69         if (IS_ERR(ah->ah)) {
  70                 kfree(ah);
  71                 ah = NULL;
  72         } else
  73                 ipoib_dbg(netdev_priv(dev), "Created ah %p\n", ah->ah);
  74
  75         return ah;
  76 }
  77
  78 void ipoib_free_ah(struct kref *kref)
  79 {
  80         struct ipoib_ah *ah = container_of(kref, struct ipoib_ah, ref);
  81         struct ipoib_dev_priv *priv = netdev_priv(ah->dev);
  82
  83         unsigned long flags;
  84
  85         spin_lock_irqsave(&priv->lock, flags);
  86         list_add_tail(&ah->list, &priv->dead_ahs);
  87         spin_unlock_irqrestore(&priv->lock, flags);
  88 }
  89
  90 static void ipoib_ud_dma_unmap_rx(struct ipoib_dev_priv *priv,
  91                                   u64 mapping[IPOIB_UD_RX_SG])
  92 {
  93         if (ipoib_ud_need_sg(priv->max_ib_mtu)) {
  94                 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_UD_HEAD_SIZE,
  95                                     DMA_FROM_DEVICE);
  96                 ib_dma_unmap_page(priv->ca, mapping[1], PAGE_SIZE,
  97                                   DMA_FROM_DEVICE);
  98         } else
  99                 ib_dma_unmap_single(priv->ca, mapping[0],
 100                                     IPOIB_UD_BUF_SIZE(priv->max_ib_mtu),
 101                                     DMA_FROM_DEVICE);
 102 }
 103
 104 static void ipoib_ud_skb_put_frags(struct ipoib_dev_priv *priv,
 105                                    struct sk_buff *skb,
 106                                    unsigned int length)
 107 {
 108         if (ipoib_ud_need_sg(priv->max_ib_mtu)) {
 109                 skb_frag_t *frag = &skb_shinfo(skb)->frags[0];
 110                 unsigned int size;
 111                 /*
 112                  * There is only two buffers needed for max_payload = 4K,
 113                  * first buf size is IPOIB_UD_HEAD_SIZE
 114                  */
 115                 skb->tail += IPOIB_UD_HEAD_SIZE;
 116                 skb->len  += length;
 117
 118                 size = length - IPOIB_UD_HEAD_SIZE;
 119
 120                 frag->size     = size;
 121                 skb->data_len += size;
 122                 skb->truesize += size;
 123         } else
 124                 skb_put(skb, length);
 125
 126 }
 127
 128 static int ipoib_ib_post_receive(struct net_device *dev, int id)
 129 {
 130         struct ipoib_dev_priv *priv = netdev_priv(dev);
 131         struct ib_recv_wr *bad_wr;
 132         int ret;
 133
 134         priv->rx_wr.wr_id   = id | IPOIB_OP_RECV;
 135         priv->rx_sge[0].addr = priv->rx_ring[id].mapping[0];
 136         priv->rx_sge[1].addr = priv->rx_ring[id].mapping[1];
 137
 138
 139         ret = ib_post_recv(priv->qp, &priv->rx_wr, &bad_wr);
 140         if (unlikely(ret)) {
 141                 ipoib_warn(priv, "receive failed for buf %d (%d)\n", id, ret);
 142                 ipoib_ud_dma_unmap_rx(priv, priv->rx_ring[id].mapping);
 143                 dev_kfree_skb_any(priv->rx_ring[id].skb);
 144                 priv->rx_ring[id].skb = NULL;
 145         }
 146
 147         return ret;
 148 }
 149
 150 static struct sk_buff *ipoib_alloc_rx_skb(struct net_device *dev, int id)
 151 {
 152         struct ipoib_dev_priv *priv = netdev_priv(dev);
 153         struct sk_buff *skb;
 154         int buf_size;
 155         u64 *mapping;
 156
 157         if (ipoib_ud_need_sg(priv->max_ib_mtu))
 158                 buf_size = IPOIB_UD_HEAD_SIZE;
 159         else
 160                 buf_size = IPOIB_UD_BUF_SIZE(priv->max_ib_mtu);
 161
 162         skb = dev_alloc_skb(buf_size + 4);
 163         if (unlikely(!skb))
 164                 return NULL;
 165
 166         /*
 167          * IB will leave a 40 byte gap for a GRH and IPoIB adds a 4 byte
 168          * header.  So we need 4 more bytes to get to 48 and align the
 169          * IP header to a multiple of 16.
 170          */
 171         skb_reserve(skb, 4);
 172
 173         mapping = priv->rx_ring[id].mapping;
 174         mapping[0] = ib_dma_map_single(priv->ca, skb->data, buf_size,
 175                                        DMA_FROM_DEVICE);
 176         if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0])))
 177                 goto error;
 178
 179         if (ipoib_ud_need_sg(priv->max_ib_mtu)) {
 180                 struct page *page = alloc_page(GFP_ATOMIC);
 181                 if (!page)
 182                         goto partial_error;
 183                 skb_fill_page_desc(skb, 0, page, 0, PAGE_SIZE);
 184                 mapping[1] =
 185                         ib_dma_map_page(priv->ca, skb_shinfo(skb)->frags[0].page,
 186                                         0, PAGE_SIZE, DMA_FROM_DEVICE);
 187                 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[1])))
 188                         goto partial_error;
 189         }
 190
 191         priv->rx_ring[id].skb = skb;
 192         return skb;
 193
 194 partial_error:
 195         ib_dma_unmap_single(priv->ca, mapping[0], buf_size, DMA_FROM_DEVICE);
 196 error:
 197         dev_kfree_skb_any(skb);
 198         return NULL;
 199 }
 200
 201 static int ipoib_ib_post_receives(struct net_device *dev)
 202 {
 203         struct ipoib_dev_priv *priv = netdev_priv(dev);
 204         int i;
 205
 206         for (i = 0; i < ipoib_recvq_size; ++i) {
 207                 if (!ipoib_alloc_rx_skb(dev, i)) {
 208                         ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
 209                         return -ENOMEM;
 210                 }
 211                 if (ipoib_ib_post_receive(dev, i)) {
 212                         ipoib_warn(priv, "ipoib_ib_post_receive failed for buf %d\n", i);
 213                         return -EIO;
 214                 }
 215         }
 216
 217         return 0;
 218 }
 219
 220 static void ipoib_ib_handle_rx_wc(struct net_device *dev, struct ib_wc *wc)
 221 {
 222         struct ipoib_dev_priv *priv = netdev_priv(dev);
 223         unsigned int wr_id = wc->wr_id & ~IPOIB_OP_RECV;
 224         struct sk_buff *skb;
 225         u64 mapping[IPOIB_UD_RX_SG];
 226
 227         ipoib_dbg_data(priv, "recv completion: id %d, status: %d\n",
 228                        wr_id, wc->status);
 229
 230         if (unlikely(wr_id >= ipoib_recvq_size)) {
 231                 ipoib_warn(priv, "recv completion event with wrid %d (> %d)\n",
 232                            wr_id, ipoib_recvq_size);
 233                 return;
 234         }
 235
 236         skb  = priv->rx_ring[wr_id].skb;
 237
 238         if (unlikely(wc->status != IB_WC_SUCCESS)) {
 239                 if (wc->status != IB_WC_WR_FLUSH_ERR)
 240                         ipoib_warn(priv, "failed recv event "
 241                                    "(status=%d, wrid=%d vend_err %x)\n",
 242                                    wc->status, wr_id, wc->vendor_err);
 243                 ipoib_ud_dma_unmap_rx(priv, priv->rx_ring[wr_id].mapping);
 244                 dev_kfree_skb_any(skb);
 245                 priv->rx_ring[wr_id].skb = NULL;
 246                 return;
 247         }
 248
 249         /*
 250          * Drop packets that this interface sent, ie multicast packets
 251          * that the HCA has replicated.
 252          */
 253         if (wc->slid == priv->local_lid && wc->src_qp == priv->qp->qp_num)
 254                 goto repost;
 255
 256         memcpy(mapping, priv->rx_ring[wr_id].mapping,
 257                IPOIB_UD_RX_SG * sizeof *mapping);
 258
 259         /*
 260          * If we can't allocate a new RX buffer, dump
 261          * this packet and reuse the old buffer.
 262          */
 263         if (unlikely(!ipoib_alloc_rx_skb(dev, wr_id))) {
 264                 ++dev->stats.rx_dropped;
 265                 goto repost;
 266         }
 267
 268         ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
 269                        wc->byte_len, wc->slid);
 270
 271         ipoib_ud_dma_unmap_rx(priv, mapping);
 272         ipoib_ud_skb_put_frags(priv, skb, wc->byte_len);
 273
 274         skb_pull(skb, IB_GRH_BYTES);
 275
 276         skb->protocol = ((struct ipoib_header *) skb->data)->proto;
 277         skb_reset_mac_header(skb);
 278         skb_pull(skb, IPOIB_ENCAP_LEN);
 279
 280         ++dev->stats.rx_packets;
 281         dev->stats.rx_bytes += skb->len;
 282
 283         skb->dev = dev;
 284         /* XXX get correct PACKET_ type here */
 285         skb->pkt_type = PACKET_HOST;
 286
 287         if (test_bit(IPOIB_FLAG_CSUM, &priv->flags) && likely(wc->csum_ok))
 288                 skb->ip_summed = CHECKSUM_UNNECESSARY;
 289
 290         if (dev->features & NETIF_F_LRO)
 291                 lro_receive_skb(&priv->lro.lro_mgr, skb, NULL);
 292         else
 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                 if (dev->features & NETIF_F_LRO)
 446                         lro_flush_all(&priv->lro.lro_mgr);
 447
 448                 napi_complete(napi);
 449                 if (unlikely(ib_req_notify_cq(priv->recv_cq,
 450                                               IB_CQ_NEXT_COMP |
 451                                               IB_CQ_REPORT_MISSED_EVENTS)) &&
 452                     napi_reschedule(napi))
 453                         goto poll_more;
 454         }
 455
 456         return done;
 457 }
 458
 459 void ipoib_ib_completion(struct ib_cq *cq, void *dev_ptr)
 460 {
 461         struct net_device *dev = dev_ptr;
 462         struct ipoib_dev_priv *priv = netdev_priv(dev);
 463
 464         napi_schedule(&priv->napi);
 465 }
 466
 467 static void drain_tx_cq(struct net_device *dev)
 468 {
 469         struct ipoib_dev_priv *priv = netdev_priv(dev);
 470
 471         netif_tx_lock(dev);
 472         while (poll_tx(priv))
 473                 ; /* nothing */
 474
 475         if (netif_queue_stopped(dev))
 476                 mod_timer(&priv->poll_timer, jiffies + 1);
 477
 478         netif_tx_unlock(dev);
 479 }
 480
 481 void ipoib_send_comp_handler(struct ib_cq *cq, void *dev_ptr)
 482 {
 483         struct ipoib_dev_priv *priv = netdev_priv(dev_ptr);
 484
 485         mod_timer(&priv->poll_timer, jiffies);
 486 }
 487
 488 static inline int post_send(struct ipoib_dev_priv *priv,
 489                             unsigned int wr_id,
 490                             struct ib_ah *address, u32 qpn,
 491                             struct ipoib_tx_buf *tx_req,
 492                             void *head, int hlen)
 493 {
 494         struct ib_send_wr *bad_wr;
 495         int i, off;
 496         struct sk_buff *skb = tx_req->skb;
 497         skb_frag_t *frags = skb_shinfo(skb)->frags;
 498         int nr_frags = skb_shinfo(skb)->nr_frags;
 499         u64 *mapping = tx_req->mapping;
 500
 501         if (skb_headlen(skb)) {
 502                 priv->tx_sge[0].addr         = mapping[0];
 503                 priv->tx_sge[0].length       = skb_headlen(skb);
 504                 off = 1;
 505         } else
 506                 off = 0;
 507
 508         for (i = 0; i < nr_frags; ++i) {
 509                 priv->tx_sge[i + off].addr = mapping[i + off];
 510                 priv->tx_sge[i + off].length = frags[i].size;
 511         }
 512         priv->tx_wr.num_sge          = nr_frags + off;
 513         priv->tx_wr.wr_id            = wr_id;
 514         priv->tx_wr.wr.ud.remote_qpn = qpn;
 515         priv->tx_wr.wr.ud.ah         = address;
 516
 517         if (head) {
 518                 priv->tx_wr.wr.ud.mss    = skb_shinfo(skb)->gso_size;
 519                 priv->tx_wr.wr.ud.header = head;
 520                 priv->tx_wr.wr.ud.hlen   = hlen;
 521                 priv->tx_wr.opcode       = IB_WR_LSO;
 522         } else
 523                 priv->tx_wr.opcode       = IB_WR_SEND;
 524
 525         return ib_post_send(priv->qp, &priv->tx_wr, &bad_wr);
 526 }
 527
 528 void ipoib_send(struct net_device *dev, struct sk_buff *skb,
 529                 struct ipoib_ah *address, u32 qpn)
 530 {
 531         struct ipoib_dev_priv *priv = netdev_priv(dev);
 532         struct ipoib_tx_buf *tx_req;
 533         int hlen, rc;
 534         void *phead;
 535
 536         if (skb_is_gso(skb)) {
 537                 hlen = skb_transport_offset(skb) + tcp_hdrlen(skb);
 538                 phead = skb->data;
 539                 if (unlikely(!skb_pull(skb, hlen))) {
 540                         ipoib_warn(priv, "linear data too small\n");
 541                         ++dev->stats.tx_dropped;
 542                         ++dev->stats.tx_errors;
 543                         dev_kfree_skb_any(skb);
 544                         return;
 545                 }
 546         } else {
 547                 if (unlikely(skb->len > priv->mcast_mtu + IPOIB_ENCAP_LEN)) {
 548                         ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
 549                                    skb->len, priv->mcast_mtu + IPOIB_ENCAP_LEN);
 550                         ++dev->stats.tx_dropped;
 551                         ++dev->stats.tx_errors;
 552                         ipoib_cm_skb_too_long(dev, skb, priv->mcast_mtu);
 553                         return;
 554                 }
 555                 phead = NULL;
 556                 hlen  = 0;
 557         }
 558
 559         ipoib_dbg_data(priv, "sending packet, length=%d address=%p qpn=0x%06x\n",
 560                        skb->len, address, qpn);
 561
 562         /*
 563          * We put the skb into the tx_ring _before_ we call post_send()
 564          * because it's entirely possible that the completion handler will
 565          * run before we execute anything after the post_send().  That
 566          * means we have to make sure everything is properly recorded and
 567          * our state is consistent before we call post_send().
 568          */
 569         tx_req = &priv->tx_ring[priv->tx_head & (ipoib_sendq_size - 1)];
 570         tx_req->skb = skb;
 571         if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req))) {
 572                 ++dev->stats.tx_errors;
 573                 dev_kfree_skb_any(skb);
 574                 return;
 575         }
 576
 577         if (skb->ip_summed == CHECKSUM_PARTIAL)
 578                 priv->tx_wr.send_flags |= IB_SEND_IP_CSUM;
 579         else
 580                 priv->tx_wr.send_flags &= ~IB_SEND_IP_CSUM;
 581
 582         if (++priv->tx_outstanding == ipoib_sendq_size) {
 583                 ipoib_dbg(priv, "TX ring full, stopping kernel net queue\n");
 584                 if (ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP))
 585                         ipoib_warn(priv, "request notify on send CQ failed\n");
 586                 netif_stop_queue(dev);
 587         }
 588
 589         rc = post_send(priv, priv->tx_head & (ipoib_sendq_size - 1),
 590                        address->ah, qpn, tx_req, phead, hlen);
 591         if (unlikely(rc)) {
 592                 ipoib_warn(priv, "post_send failed, error %d\n", rc);
 593                 ++dev->stats.tx_errors;
 594                 --priv->tx_outstanding;
 595                 ipoib_dma_unmap_tx(priv->ca, tx_req);
 596                 dev_kfree_skb_any(skb);
 597                 if (netif_queue_stopped(dev))
 598                         netif_wake_queue(dev);
 599         } else {
 600                 dev->trans_start = jiffies;
 601
 602                 address->last_send = priv->tx_head;
 603                 ++priv->tx_head;
 604                 skb_orphan(skb);
 605
 606         }
 607
 608         if (unlikely(priv->tx_outstanding > MAX_SEND_CQE))
 609                 while (poll_tx(priv))
 610                         ; /* nothing */
 611 }
 612
 613 static void __ipoib_reap_ah(struct net_device *dev)
 614 {
 615         struct ipoib_dev_priv *priv = netdev_priv(dev);
 616         struct ipoib_ah *ah, *tah;
 617         LIST_HEAD(remove_list);
 618         unsigned long flags;
 619
 620         netif_tx_lock_bh(dev);
 621         spin_lock_irqsave(&priv->lock, flags);
 622
 623         list_for_each_entry_safe(ah, tah, &priv->dead_ahs, list)
 624                 if ((int) priv->tx_tail - (int) ah->last_send >= 0) {
 625                         list_del(&ah->list);
 626                         ib_destroy_ah(ah->ah);
 627                         kfree(ah);
 628                 }
 629
 630         spin_unlock_irqrestore(&priv->lock, flags);
 631         netif_tx_unlock_bh(dev);
 632 }
 633
 634 void ipoib_reap_ah(struct work_struct *work)
 635 {
 636         struct ipoib_dev_priv *priv =
 637                 container_of(work, struct ipoib_dev_priv, ah_reap_task.work);
 638         struct net_device *dev = priv->dev;
 639
 640         __ipoib_reap_ah(dev);
 641
 642         if (!test_bit(IPOIB_STOP_REAPER, &priv->flags))
 643                 queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task,
 644                                    round_jiffies_relative(HZ));
 645 }
 646
 647 static void ipoib_ib_tx_timer_func(unsigned long ctx)
 648 {
 649         drain_tx_cq((struct net_device *)ctx);
 650 }
 651
 652 int ipoib_ib_dev_open(struct net_device *dev)
 653 {
 654         struct ipoib_dev_priv *priv = netdev_priv(dev);
 655         int ret;
 656
 657         if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &priv->pkey_index)) {
 658                 ipoib_warn(priv, "P_Key 0x%04x not found\n", priv->pkey);
 659                 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 660                 return -1;
 661         }
 662         set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 663
 664         ret = ipoib_init_qp(dev);
 665         if (ret) {
 666                 ipoib_warn(priv, "ipoib_init_qp returned %d\n", ret);
 667                 return -1;
 668         }
 669
 670         ret = ipoib_ib_post_receives(dev);
 671         if (ret) {
 672                 ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret);
 673                 ipoib_ib_dev_stop(dev, 1);
 674                 return -1;
 675         }
 676
 677         ret = ipoib_cm_dev_open(dev);
 678         if (ret) {
 679                 ipoib_warn(priv, "ipoib_cm_dev_open returned %d\n", ret);
 680                 ipoib_ib_dev_stop(dev, 1);
 681                 return -1;
 682         }
 683
 684         clear_bit(IPOIB_STOP_REAPER, &priv->flags);
 685         queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task,
 686                            round_jiffies_relative(HZ));
 687
 688         if (!test_and_set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
 689                 napi_enable(&priv->napi);
 690
 691         return 0;
 692 }
 693
 694 static void ipoib_pkey_dev_check_presence(struct net_device *dev)
 695 {
 696         struct ipoib_dev_priv *priv = netdev_priv(dev);
 697         u16 pkey_index = 0;
 698
 699         if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &pkey_index))
 700                 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 701         else
 702                 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 703 }
 704
 705 int ipoib_ib_dev_up(struct net_device *dev)
 706 {
 707         struct ipoib_dev_priv *priv = netdev_priv(dev);
 708
 709         ipoib_pkey_dev_check_presence(dev);
 710
 711         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
 712                 ipoib_dbg(priv, "PKEY is not assigned.\n");
 713                 return 0;
 714         }
 715
 716         set_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
 717
 718         return ipoib_mcast_start_thread(dev);
 719 }
 720
 721 int ipoib_ib_dev_down(struct net_device *dev, int flush)
 722 {
 723         struct ipoib_dev_priv *priv = netdev_priv(dev);
 724
 725         ipoib_dbg(priv, "downing ib_dev\n");
 726
 727         clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
 728         netif_carrier_off(dev);
 729
 730         /* Shutdown the P_Key thread if still active */
 731         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
 732                 mutex_lock(&pkey_mutex);
 733                 set_bit(IPOIB_PKEY_STOP, &priv->flags);
 734                 cancel_delayed_work(&priv->pkey_poll_task);
 735                 mutex_unlock(&pkey_mutex);
 736                 if (flush)
 737                         flush_workqueue(ipoib_workqueue);
 738         }
 739
 740         ipoib_mcast_stop_thread(dev, flush);
 741         ipoib_mcast_dev_flush(dev);
 742
 743         ipoib_flush_paths(dev);
 744
 745         return 0;
 746 }
 747
 748 static int recvs_pending(struct net_device *dev)
 749 {
 750         struct ipoib_dev_priv *priv = netdev_priv(dev);
 751         int pending = 0;
 752         int i;
 753
 754         for (i = 0; i < ipoib_recvq_size; ++i)
 755                 if (priv->rx_ring[i].skb)
 756                         ++pending;
 757
 758         return pending;
 759 }
 760
 761 void ipoib_drain_cq(struct net_device *dev)
 762 {
 763         struct ipoib_dev_priv *priv = netdev_priv(dev);
 764         int i, n;
 765
 766         /*
 767          * We call completion handling routines that expect to be
 768          * called from the BH-disabled NAPI poll context, so disable
 769          * BHs here too.
 770          */
 771         local_bh_disable();
 772
 773         do {
 774                 n = ib_poll_cq(priv->recv_cq, IPOIB_NUM_WC, priv->ibwc);
 775                 for (i = 0; i < n; ++i) {
 776                         /*
 777                          * Convert any successful completions to flush
 778                          * errors to avoid passing packets up the
 779                          * stack after bringing the device down.
 780                          */
 781                         if (priv->ibwc[i].status == IB_WC_SUCCESS)
 782                                 priv->ibwc[i].status = IB_WC_WR_FLUSH_ERR;
 783
 784                         if (priv->ibwc[i].wr_id & IPOIB_OP_RECV) {
 785                                 if (priv->ibwc[i].wr_id & IPOIB_OP_CM)
 786                                         ipoib_cm_handle_rx_wc(dev, priv->ibwc + i);
 787                                 else
 788                                         ipoib_ib_handle_rx_wc(dev, priv->ibwc + i);
 789                         } else
 790                                 ipoib_cm_handle_tx_wc(dev, priv->ibwc + i);
 791                 }
 792         } while (n == IPOIB_NUM_WC);
 793
 794         while (poll_tx(priv))
 795                 ; /* nothing */
 796
 797         local_bh_enable();
 798 }
 799
 800 int ipoib_ib_dev_stop(struct net_device *dev, int flush)
 801 {
 802         struct ipoib_dev_priv *priv = netdev_priv(dev);
 803         struct ib_qp_attr qp_attr;
 804         unsigned long begin;
 805         struct ipoib_tx_buf *tx_req;
 806         int i;
 807
 808         if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
 809                 napi_disable(&priv->napi);
 810
 811         ipoib_cm_dev_stop(dev);
 812
 813         /*
 814          * Move our QP to the error state and then reinitialize in
 815          * when all work requests have completed or have been flushed.
 816          */
 817         qp_attr.qp_state = IB_QPS_ERR;
 818         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
 819                 ipoib_warn(priv, "Failed to modify QP to ERROR state\n");
 820
 821         /* Wait for all sends and receives to complete */
 822         begin = jiffies;
 823
 824         while (priv->tx_head != priv->tx_tail || recvs_pending(dev)) {
 825                 if (time_after(jiffies, begin + 5 * HZ)) {
 826                         ipoib_warn(priv, "timing out; %d sends %d receives not completed\n",
 827                                    priv->tx_head - priv->tx_tail, recvs_pending(dev));
 828
 829                         /*
 830                          * assume the HW is wedged and just free up
 831                          * all our pending work requests.
 832                          */
 833                         while ((int) priv->tx_tail - (int) priv->tx_head < 0) {
 834                                 tx_req = &priv->tx_ring[priv->tx_tail &
 835                                                         (ipoib_sendq_size - 1)];
 836                                 ipoib_dma_unmap_tx(priv->ca, tx_req);
 837                                 dev_kfree_skb_any(tx_req->skb);
 838                                 ++priv->tx_tail;
 839                                 --priv->tx_outstanding;
 840                         }
 841
 842                         for (i = 0; i < ipoib_recvq_size; ++i) {
 843                                 struct ipoib_rx_buf *rx_req;
 844
 845                                 rx_req = &priv->rx_ring[i];
 846                                 if (!rx_req->skb)
 847                                         continue;
 848                                 ipoib_ud_dma_unmap_rx(priv,
 849                                                       priv->rx_ring[i].mapping);
 850                                 dev_kfree_skb_any(rx_req->skb);
 851                                 rx_req->skb = NULL;
 852                         }
 853
 854                         goto timeout;
 855                 }
 856
 857                 ipoib_drain_cq(dev);
 858
 859                 msleep(1);
 860         }
 861
 862         ipoib_dbg(priv, "All sends and receives done.\n");
 863
 864 timeout:
 865         del_timer_sync(&priv->poll_timer);
 866         qp_attr.qp_state = IB_QPS_RESET;
 867         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
 868                 ipoib_warn(priv, "Failed to modify QP to RESET state\n");
 869
 870         /* Wait for all AHs to be reaped */
 871         set_bit(IPOIB_STOP_REAPER, &priv->flags);
 872         cancel_delayed_work(&priv->ah_reap_task);
 873         if (flush)
 874                 flush_workqueue(ipoib_workqueue);
 875
 876         begin = jiffies;
 877
 878         while (!list_empty(&priv->dead_ahs)) {
 879                 __ipoib_reap_ah(dev);
 880
 881                 if (time_after(jiffies, begin + HZ)) {
 882                         ipoib_warn(priv, "timing out; will leak address handles\n");
 883                         break;
 884                 }
 885
 886                 msleep(1);
 887         }
 888
 889         ib_req_notify_cq(priv->recv_cq, IB_CQ_NEXT_COMP);
 890
 891         return 0;
 892 }
 893
 894 int ipoib_ib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
 895 {
 896         struct ipoib_dev_priv *priv = netdev_priv(dev);
 897
 898         priv->ca = ca;
 899         priv->port = port;
 900         priv->qp = NULL;
 901
 902         if (ipoib_transport_dev_init(dev, ca)) {
 903                 printk(KERN_WARNING "%s: ipoib_transport_dev_init failed\n", ca->name);
 904                 return -ENODEV;
 905         }
 906
 907         setup_timer(&priv->poll_timer, ipoib_ib_tx_timer_func,
 908                     (unsigned long) dev);
 909
 910         if (dev->flags & IFF_UP) {
 911                 if (ipoib_ib_dev_open(dev)) {
 912                         ipoib_transport_dev_cleanup(dev);
 913                         return -ENODEV;
 914                 }
 915         }
 916
 917         return 0;
 918 }
 919
 920 static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv,
 921                                 enum ipoib_flush_level level)
 922 {
 923         struct ipoib_dev_priv *cpriv;
 924         struct net_device *dev = priv->dev;
 925         u16 new_index;
 926
 927         mutex_lock(&priv->vlan_mutex);
 928
 929         /*
 930          * Flush any child interfaces too -- they might be up even if
 931          * the parent is down.
 932          */
 933         list_for_each_entry(cpriv, &priv->child_intfs, list)
 934                 __ipoib_ib_dev_flush(cpriv, level);
 935
 936         mutex_unlock(&priv->vlan_mutex);
 937
 938         if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) {
 939                 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n");
 940                 return;
 941         }
 942
 943         if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
 944                 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n");
 945                 return;
 946         }
 947
 948         if (level == IPOIB_FLUSH_HEAVY) {
 949                 if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &new_index)) {
 950                         clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 951                         ipoib_ib_dev_down(dev, 0);
 952                         ipoib_ib_dev_stop(dev, 0);
 953                         if (ipoib_pkey_dev_delay_open(dev))
 954                                 return;
 955                 }
 956
 957                 /* restart QP only if P_Key index is changed */
 958                 if (test_and_set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags) &&
 959                     new_index == priv->pkey_index) {
 960                         ipoib_dbg(priv, "Not flushing - P_Key index not changed.\n");
 961                         return;
 962                 }
 963                 priv->pkey_index = new_index;
 964         }
 965
 966         if (level == IPOIB_FLUSH_LIGHT) {
 967                 ipoib_mark_paths_invalid(dev);
 968                 ipoib_mcast_dev_flush(dev);
 969         }
 970
 971         if (level >= IPOIB_FLUSH_NORMAL)
 972                 ipoib_ib_dev_down(dev, 0);
 973
 974         if (level == IPOIB_FLUSH_HEAVY) {
 975                 ipoib_ib_dev_stop(dev, 0);
 976                 ipoib_ib_dev_open(dev);
 977         }
 978
 979         /*
 980          * The device could have been brought down between the start and when
 981          * we get here, don't bring it back up if it's not configured up
 982          */
 983         if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
 984                 if (level >= IPOIB_FLUSH_NORMAL)
 985                         ipoib_ib_dev_up(dev);
 986                 ipoib_mcast_restart_task(&priv->restart_task);
 987         }
 988 }
 989
 990 void ipoib_ib_dev_flush_light(struct work_struct *work)
 991 {
 992         struct ipoib_dev_priv *priv =
 993                 container_of(work, struct ipoib_dev_priv, flush_light);
 994
 995         __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_LIGHT);
 996 }
 997
 998 void ipoib_ib_dev_flush_normal(struct work_struct *work)
 999 {
1000         struct ipoib_dev_priv *priv =
1001                 container_of(work, struct ipoib_dev_priv, flush_normal);
1002
1003         __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_NORMAL);
1004 }
1005
1006 void ipoib_ib_dev_flush_heavy(struct work_struct *work)
1007 {
1008         struct ipoib_dev_priv *priv =
1009                 container_of(work, struct ipoib_dev_priv, flush_heavy);
1010
1011         __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_HEAVY);
1012 }
1013
1014 void ipoib_ib_dev_cleanup(struct net_device *dev)
1015 {
1016         struct ipoib_dev_priv *priv = netdev_priv(dev);
1017
1018         ipoib_dbg(priv, "cleaning up ib_dev\n");
1019
1020         ipoib_mcast_stop_thread(dev, 1);
1021         ipoib_mcast_dev_flush(dev);
1022
1023         ipoib_transport_dev_cleanup(dev);
1024 }
1025
1026 /*
1027  * Delayed P_Key Assigment Interim Support
1028  *
1029  * The following is initial implementation of delayed P_Key assigment
1030  * mechanism. It is using the same approach implemented for the multicast
1031  * group join. The single goal of this implementation is to quickly address
1032  * Bug #2507. This implementation will probably be removed when the P_Key
1033  * change async notification is available.
1034  */
1035
1036 void ipoib_pkey_poll(struct work_struct *work)
1037 {
1038         struct ipoib_dev_priv *priv =
1039                 container_of(work, struct ipoib_dev_priv, pkey_poll_task.work);
1040         struct net_device *dev = priv->dev;
1041
1042         ipoib_pkey_dev_check_presence(dev);
1043
1044         if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags))
1045                 ipoib_open(dev);
1046         else {
1047                 mutex_lock(&pkey_mutex);
1048                 if (!test_bit(IPOIB_PKEY_STOP, &priv->flags))
1049                         queue_delayed_work(ipoib_workqueue,
1050                                            &priv->pkey_poll_task,
1051                                            HZ);
1052                 mutex_unlock(&pkey_mutex);
1053         }
1054 }
1055
1056 int ipoib_pkey_dev_delay_open(struct net_device *dev)
1057 {
1058         struct ipoib_dev_priv *priv = netdev_priv(dev);
1059
1060         /* Look for the interface pkey value in the IB Port P_Key table and */
1061         /* set the interface pkey assigment flag                            */
1062         ipoib_pkey_dev_check_presence(dev);
1063
1064         /* P_Key value not assigned yet - start polling */
1065         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
1066                 mutex_lock(&pkey_mutex);
1067                 clear_bit(IPOIB_PKEY_STOP, &priv->flags);
1068                 queue_delayed_work(ipoib_workqueue,
1069                                    &priv->pkey_poll_task,
1070                                    HZ);
1071                 mutex_unlock(&pkey_mutex);
1072                 return 1;
1073         }
1074
1075         return 0;
1076 }