drivers/infiniband/ulp/ipoib/ipoib_ib.c

   1 /*
   2  * Copyright (c) 2004, 2005 Topspin Communications.  All rights reserved.
   3  * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
   4  * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
   5  * Copyright (c) 2004, 2005 Voltaire, Inc. All rights reserved.
   6  *
   7  * This software is available to you under a choice of one of two
   8  * licenses.  You may choose to be licensed under the terms of the GNU
   9  * General Public License (GPL) Version 2, available from the file
  10  * COPYING in the main directory of this source tree, or the
  11  * OpenIB.org BSD license below:
  12  *
  13  *     Redistribution and use in source and binary forms, with or
  14  *     without modification, are permitted provided that the following
  15  *     conditions are met:
  16  *
  17  *      - Redistributions of source code must retain the above
  18  *        copyright notice, this list of conditions and the following
  19  *        disclaimer.
  20  *
  21  *      - Redistributions in binary form must reproduce the above
  22  *        copyright notice, this list of conditions and the following
  23  *        disclaimer in the documentation and/or other materials
  24  *        provided with the distribution.
  25  *
  26  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  27  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  28  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  29  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  30  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  31  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  32  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  33  * SOFTWARE.
  34  */
  35
  36 #include <linux/delay.h>
  37 #include <linux/moduleparam.h>
  38 #include <linux/dma-mapping.h>
  39 #include <linux/slab.h>
  40
  41 #include <linux/ip.h>
  42 #include <linux/tcp.h>
  43
  44 #include "ipoib.h"
  45
  46 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA
  47 static int data_debug_level;
  48
  49 module_param(data_debug_level, int, 0644);
  50 MODULE_PARM_DESC(data_debug_level,
  51                  "Enable data path debug tracing if > 0");
  52 #endif
  53
  54 static DEFINE_MUTEX(pkey_mutex);
  55
  56 struct ipoib_ah *ipoib_create_ah(struct net_device *dev,
  57                                  struct ib_pd *pd, struct ib_ah_attr *attr)
  58 {
  59         struct ipoib_ah *ah;
  60         struct ib_ah *vah;
  61
  62         ah = kmalloc(sizeof *ah, GFP_KERNEL);
  63         if (!ah)
  64                 return ERR_PTR(-ENOMEM);
  65
  66         ah->dev       = dev;
  67         ah->last_send = 0;
  68         kref_init(&ah->ref);
  69
  70         vah = ib_create_ah(pd, attr);
  71         if (IS_ERR(vah)) {
  72                 kfree(ah);
  73                 ah = (struct ipoib_ah *)vah;
  74         } else {
  75                 ah->ah = vah;
  76                 ipoib_dbg(netdev_priv(dev), "Created ah %p\n", ah->ah);
  77         }
  78
  79         return ah;
  80 }
  81
  82 void ipoib_free_ah(struct kref *kref)
  83 {
  84         struct ipoib_ah *ah = container_of(kref, struct ipoib_ah, ref);
  85         struct ipoib_dev_priv *priv = netdev_priv(ah->dev);
  86
  87         unsigned long flags;
  88
  89         spin_lock_irqsave(&priv->lock, flags);
  90         list_add_tail(&ah->list, &priv->dead_ahs);
  91         spin_unlock_irqrestore(&priv->lock, flags);
  92 }
  93
  94 static void ipoib_ud_dma_unmap_rx(struct ipoib_dev_priv *priv,
  95                                   u64 mapping[IPOIB_UD_RX_SG])
  96 {
  97         ib_dma_unmap_single(priv->ca, mapping[0],
  98                             IPOIB_UD_BUF_SIZE(priv->max_ib_mtu),
  99                             DMA_FROM_DEVICE);
 100 }
 101
 102 static int ipoib_ib_post_receive(struct net_device *dev, int id)
 103 {
 104         struct ipoib_dev_priv *priv = netdev_priv(dev);
 105         struct ib_recv_wr *bad_wr;
 106         int ret;
 107
 108         priv->rx_wr.wr_id   = id | IPOIB_OP_RECV;
 109         priv->rx_sge[0].addr = priv->rx_ring[id].mapping[0];
 110         priv->rx_sge[1].addr = priv->rx_ring[id].mapping[1];
 111
 112
 113         ret = ib_post_recv(priv->qp, &priv->rx_wr, &bad_wr);
 114         if (unlikely(ret)) {
 115                 ipoib_warn(priv, "receive failed for buf %d (%d)\n", id, ret);
 116                 ipoib_ud_dma_unmap_rx(priv, priv->rx_ring[id].mapping);
 117                 dev_kfree_skb_any(priv->rx_ring[id].skb);
 118                 priv->rx_ring[id].skb = NULL;
 119         }
 120
 121         return ret;
 122 }
 123
 124 static struct sk_buff *ipoib_alloc_rx_skb(struct net_device *dev, int id)
 125 {
 126         struct ipoib_dev_priv *priv = netdev_priv(dev);
 127         struct sk_buff *skb;
 128         int buf_size;
 129         u64 *mapping;
 130
 131         buf_size = IPOIB_UD_BUF_SIZE(priv->max_ib_mtu);
 132
 133         skb = dev_alloc_skb(buf_size + IPOIB_ENCAP_LEN);
 134         if (unlikely(!skb))
 135                 return NULL;
 136
 137         /*
 138          * IB will leave a 40 byte gap for a GRH and IPoIB adds a 4 byte
 139          * header.  So we need 4 more bytes to get to 48 and align the
 140          * IP header to a multiple of 16.
 141          */
 142         skb_reserve(skb, 4);
 143
 144         mapping = priv->rx_ring[id].mapping;
 145         mapping[0] = ib_dma_map_single(priv->ca, skb->data, buf_size,
 146                                        DMA_FROM_DEVICE);
 147         if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0])))
 148                 goto error;
 149
 150         priv->rx_ring[id].skb = skb;
 151         return skb;
 152 error:
 153         dev_kfree_skb_any(skb);
 154         return NULL;
 155 }
 156
 157 static int ipoib_ib_post_receives(struct net_device *dev)
 158 {
 159         struct ipoib_dev_priv *priv = netdev_priv(dev);
 160         int i;
 161
 162         for (i = 0; i < ipoib_recvq_size; ++i) {
 163                 if (!ipoib_alloc_rx_skb(dev, i)) {
 164                         ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
 165                         return -ENOMEM;
 166                 }
 167                 if (ipoib_ib_post_receive(dev, i)) {
 168                         ipoib_warn(priv, "ipoib_ib_post_receive failed for buf %d\n", i);
 169                         return -EIO;
 170                 }
 171         }
 172
 173         return 0;
 174 }
 175
 176 static void ipoib_ib_handle_rx_wc(struct net_device *dev, struct ib_wc *wc)
 177 {
 178         struct ipoib_dev_priv *priv = netdev_priv(dev);
 179         unsigned int wr_id = wc->wr_id & ~IPOIB_OP_RECV;
 180         struct sk_buff *skb;
 181         u64 mapping[IPOIB_UD_RX_SG];
 182         union ib_gid *dgid;
 183
 184         ipoib_dbg_data(priv, "recv completion: id %d, status: %d\n",
 185                        wr_id, wc->status);
 186
 187         if (unlikely(wr_id >= ipoib_recvq_size)) {
 188                 ipoib_warn(priv, "recv completion event with wrid %d (> %d)\n",
 189                            wr_id, ipoib_recvq_size);
 190                 return;
 191         }
 192
 193         skb  = priv->rx_ring[wr_id].skb;
 194
 195         if (unlikely(wc->status != IB_WC_SUCCESS)) {
 196                 if (wc->status != IB_WC_WR_FLUSH_ERR)
 197                         ipoib_warn(priv, "failed recv event "
 198                                    "(status=%d, wrid=%d vend_err %x)\n",
 199                                    wc->status, wr_id, wc->vendor_err);
 200                 ipoib_ud_dma_unmap_rx(priv, priv->rx_ring[wr_id].mapping);
 201                 dev_kfree_skb_any(skb);
 202                 priv->rx_ring[wr_id].skb = NULL;
 203                 return;
 204         }
 205
 206         /*
 207          * Drop packets that this interface sent, ie multicast packets
 208          * that the HCA has replicated.
 209          */
 210         if (wc->slid == priv->local_lid && wc->src_qp == priv->qp->qp_num)
 211                 goto repost;
 212
 213         memcpy(mapping, priv->rx_ring[wr_id].mapping,
 214                IPOIB_UD_RX_SG * sizeof *mapping);
 215
 216         /*
 217          * If we can't allocate a new RX buffer, dump
 218          * this packet and reuse the old buffer.
 219          */
 220         if (unlikely(!ipoib_alloc_rx_skb(dev, wr_id))) {
 221                 ++dev->stats.rx_dropped;
 222                 goto repost;
 223         }
 224
 225         ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
 226                        wc->byte_len, wc->slid);
 227
 228         ipoib_ud_dma_unmap_rx(priv, mapping);
 229
 230         skb_put(skb, wc->byte_len);
 231
 232         /* First byte of dgid signals multicast when 0xff */
 233         dgid = &((struct ib_grh *)skb->data)->dgid;
 234
 235         if (!(wc->wc_flags & IB_WC_GRH) || dgid->raw[0] != 0xff)
 236                 skb->pkt_type = PACKET_HOST;
 237         else if (memcmp(dgid, dev->broadcast + 4, sizeof(union ib_gid)) == 0)
 238                 skb->pkt_type = PACKET_BROADCAST;
 239         else
 240                 skb->pkt_type = PACKET_MULTICAST;
 241
 242         skb_pull(skb, IB_GRH_BYTES);
 243
 244         skb->protocol = ((struct ipoib_header *) skb->data)->proto;
 245         skb_reset_mac_header(skb);
 246         skb_pull(skb, IPOIB_ENCAP_LEN);
 247
 248         ++dev->stats.rx_packets;
 249         dev->stats.rx_bytes += skb->len;
 250
 251         skb->dev = dev;
 252         if ((dev->features & NETIF_F_RXCSUM) &&
 253                         likely(wc->wc_flags & IB_WC_IP_CSUM_OK))
 254                 skb->ip_summed = CHECKSUM_UNNECESSARY;
 255
 256         napi_gro_receive(&priv->napi, skb);
 257
 258 repost:
 259         if (unlikely(ipoib_ib_post_receive(dev, wr_id)))
 260                 ipoib_warn(priv, "ipoib_ib_post_receive failed "
 261                            "for buf %d\n", wr_id);
 262 }
 263
 264 int ipoib_dma_map_tx(struct ib_device *ca, struct ipoib_tx_buf *tx_req)
 265 {
 266         struct sk_buff *skb = tx_req->skb;
 267         u64 *mapping = tx_req->mapping;
 268         int i;
 269         int off;
 270
 271         if (skb_headlen(skb)) {
 272                 mapping[0] = ib_dma_map_single(ca, skb->data, skb_headlen(skb),
 273                                                DMA_TO_DEVICE);
 274                 if (unlikely(ib_dma_mapping_error(ca, mapping[0])))
 275                         return -EIO;
 276
 277                 off = 1;
 278         } else
 279                 off = 0;
 280
 281         for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) {
 282                 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 283                 mapping[i + off] = ib_dma_map_page(ca,
 284                                                  skb_frag_page(frag),
 285                                                  frag->page_offset, skb_frag_size(frag),
 286                                                  DMA_TO_DEVICE);
 287                 if (unlikely(ib_dma_mapping_error(ca, mapping[i + off])))
 288                         goto partial_error;
 289         }
 290         return 0;
 291
 292 partial_error:
 293         for (; i > 0; --i) {
 294                 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i - 1];
 295
 296                 ib_dma_unmap_page(ca, mapping[i - !off], skb_frag_size(frag), DMA_TO_DEVICE);
 297         }
 298
 299         if (off)
 300                 ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE);
 301
 302         return -EIO;
 303 }
 304
 305 void ipoib_dma_unmap_tx(struct ipoib_dev_priv *priv,
 306                         struct ipoib_tx_buf *tx_req)
 307 {
 308         struct sk_buff *skb = tx_req->skb;
 309         u64 *mapping = tx_req->mapping;
 310         int i;
 311         int off;
 312
 313         if (skb_headlen(skb)) {
 314                 ib_dma_unmap_single(priv->ca, mapping[0], skb_headlen(skb),
 315                                     DMA_TO_DEVICE);
 316                 off = 1;
 317         } else
 318                 off = 0;
 319
 320         for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) {
 321                 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 322
 323                 ib_dma_unmap_page(priv->ca, mapping[i + off],
 324                                   skb_frag_size(frag), DMA_TO_DEVICE);
 325         }
 326 }
 327
 328 /*
 329  * As the result of a completion error the QP Can be transferred to SQE states.
 330  * The function checks if the (send)QP is in SQE state and
 331  * moves it back to RTS state, that in order to have it functional again.
 332  */
 333 static void ipoib_qp_state_validate_work(struct work_struct *work)
 334 {
 335         struct ipoib_qp_state_validate *qp_work =
 336                 container_of(work, struct ipoib_qp_state_validate, work);
 337
 338         struct ipoib_dev_priv *priv = qp_work->priv;
 339         struct ib_qp_attr qp_attr;
 340         struct ib_qp_init_attr query_init_attr;
 341         int ret;
 342
 343         ret = ib_query_qp(priv->qp, &qp_attr, IB_QP_STATE, &query_init_attr);
 344         if (ret) {
 345                 ipoib_warn(priv, "%s: Failed to query QP ret: %d\n",
 346                            __func__, ret);
 347                 goto free_res;
 348         }
 349         pr_info("%s: QP: 0x%x is in state: %d\n",
 350                 __func__, priv->qp->qp_num, qp_attr.qp_state);
 351
 352         /* currently support only in SQE->RTS transition*/
 353         if (qp_attr.qp_state == IB_QPS_SQE) {
 354                 qp_attr.qp_state = IB_QPS_RTS;
 355
 356                 ret = ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE);
 357                 if (ret) {
 358                         pr_warn("failed(%d) modify QP:0x%x SQE->RTS\n",
 359                                 ret, priv->qp->qp_num);
 360                         goto free_res;
 361                 }
 362                 pr_info("%s: QP: 0x%x moved from IB_QPS_SQE to IB_QPS_RTS\n",
 363                         __func__, priv->qp->qp_num);
 364         } else {
 365                 pr_warn("QP (%d) will stay in state: %d\n",
 366                         priv->qp->qp_num, qp_attr.qp_state);
 367         }
 368
 369 free_res:
 370         kfree(qp_work);
 371 }
 372
 373 static void ipoib_ib_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
 374 {
 375         struct ipoib_dev_priv *priv = netdev_priv(dev);
 376         unsigned int wr_id = wc->wr_id;
 377         struct ipoib_tx_buf *tx_req;
 378
 379         ipoib_dbg_data(priv, "send completion: id %d, status: %d\n",
 380                        wr_id, wc->status);
 381
 382         if (unlikely(wr_id >= ipoib_sendq_size)) {
 383                 ipoib_warn(priv, "send completion event with wrid %d (> %d)\n",
 384                            wr_id, ipoib_sendq_size);
 385                 return;
 386         }
 387
 388         tx_req = &priv->tx_ring[wr_id];
 389
 390         ipoib_dma_unmap_tx(priv, tx_req);
 391
 392         ++dev->stats.tx_packets;
 393         dev->stats.tx_bytes += tx_req->skb->len;
 394
 395         dev_kfree_skb_any(tx_req->skb);
 396
 397         ++priv->tx_tail;
 398         if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
 399             netif_queue_stopped(dev) &&
 400             test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
 401                 netif_wake_queue(dev);
 402
 403         if (wc->status != IB_WC_SUCCESS &&
 404             wc->status != IB_WC_WR_FLUSH_ERR) {
 405                 struct ipoib_qp_state_validate *qp_work;
 406                 ipoib_warn(priv, "failed send event "
 407                            "(status=%d, wrid=%d vend_err %x)\n",
 408                            wc->status, wr_id, wc->vendor_err);
 409                 qp_work = kzalloc(sizeof(*qp_work), GFP_ATOMIC);
 410                 if (!qp_work) {
 411                         ipoib_warn(priv, "%s Failed alloc ipoib_qp_state_validate for qp: 0x%x\n",
 412                                    __func__, priv->qp->qp_num);
 413                         return;
 414                 }
 415
 416                 INIT_WORK(&qp_work->work, ipoib_qp_state_validate_work);
 417                 qp_work->priv = priv;
 418                 queue_work(priv->wq, &qp_work->work);
 419         }
 420 }
 421
 422 static int poll_tx(struct ipoib_dev_priv *priv)
 423 {
 424         int n, i;
 425
 426         n = ib_poll_cq(priv->send_cq, MAX_SEND_CQE, priv->send_wc);
 427         for (i = 0; i < n; ++i)
 428                 ipoib_ib_handle_tx_wc(priv->dev, priv->send_wc + i);
 429
 430         return n == MAX_SEND_CQE;
 431 }
 432
 433 int ipoib_poll(struct napi_struct *napi, int budget)
 434 {
 435         struct ipoib_dev_priv *priv = container_of(napi, struct ipoib_dev_priv, napi);
 436         struct net_device *dev = priv->dev;
 437         int done;
 438         int t;
 439         int n, i;
 440
 441         done  = 0;
 442
 443 poll_more:
 444         while (done < budget) {
 445                 int max = (budget - done);
 446
 447                 t = min(IPOIB_NUM_WC, max);
 448                 n = ib_poll_cq(priv->recv_cq, t, priv->ibwc);
 449
 450                 for (i = 0; i < n; i++) {
 451                         struct ib_wc *wc = priv->ibwc + i;
 452
 453                         if (wc->wr_id & IPOIB_OP_RECV) {
 454                                 ++done;
 455                                 if (wc->wr_id & IPOIB_OP_CM)
 456                                         ipoib_cm_handle_rx_wc(dev, wc);
 457                                 else
 458                                         ipoib_ib_handle_rx_wc(dev, wc);
 459                         } else
 460                                 ipoib_cm_handle_tx_wc(priv->dev, wc);
 461                 }
 462
 463                 if (n != t)
 464                         break;
 465         }
 466
 467         if (done < budget) {
 468                 napi_complete(napi);
 469                 if (unlikely(ib_req_notify_cq(priv->recv_cq,
 470                                               IB_CQ_NEXT_COMP |
 471                                               IB_CQ_REPORT_MISSED_EVENTS)) &&
 472                     napi_reschedule(napi))
 473                         goto poll_more;
 474         }
 475
 476         return done;
 477 }
 478
 479 void ipoib_ib_completion(struct ib_cq *cq, void *dev_ptr)
 480 {
 481         struct net_device *dev = dev_ptr;
 482         struct ipoib_dev_priv *priv = netdev_priv(dev);
 483
 484         napi_schedule(&priv->napi);
 485 }
 486
 487 static void drain_tx_cq(struct net_device *dev)
 488 {
 489         struct ipoib_dev_priv *priv = netdev_priv(dev);
 490
 491         netif_tx_lock(dev);
 492         while (poll_tx(priv))
 493                 ; /* nothing */
 494
 495         if (netif_queue_stopped(dev))
 496                 mod_timer(&priv->poll_timer, jiffies + 1);
 497
 498         netif_tx_unlock(dev);
 499 }
 500
 501 void ipoib_send_comp_handler(struct ib_cq *cq, void *dev_ptr)
 502 {
 503         struct ipoib_dev_priv *priv = netdev_priv(dev_ptr);
 504
 505         mod_timer(&priv->poll_timer, jiffies);
 506 }
 507
 508 static inline int post_send(struct ipoib_dev_priv *priv,
 509                             unsigned int wr_id,
 510                             struct ib_ah *address, u32 qpn,
 511                             struct ipoib_tx_buf *tx_req,
 512                             void *head, int hlen)
 513 {
 514         struct ib_send_wr *bad_wr;
 515         struct sk_buff *skb = tx_req->skb;
 516
 517         ipoib_build_sge(priv, tx_req);
 518
 519         priv->tx_wr.wr.wr_id    = wr_id;
 520         priv->tx_wr.remote_qpn  = qpn;
 521         priv->tx_wr.ah          = address;
 522
 523         if (head) {
 524                 priv->tx_wr.mss         = skb_shinfo(skb)->gso_size;
 525                 priv->tx_wr.header      = head;
 526                 priv->tx_wr.hlen        = hlen;
 527                 priv->tx_wr.wr.opcode   = IB_WR_LSO;
 528         } else
 529                 priv->tx_wr.wr.opcode   = IB_WR_SEND;
 530
 531         return ib_post_send(priv->qp, &priv->tx_wr.wr, &bad_wr);
 532 }
 533
 534 void ipoib_send(struct net_device *dev, struct sk_buff *skb,
 535                 struct ipoib_ah *address, u32 qpn)
 536 {
 537         struct ipoib_dev_priv *priv = netdev_priv(dev);
 538         struct ipoib_tx_buf *tx_req;
 539         int hlen, rc;
 540         void *phead;
 541
 542         if (skb_is_gso(skb)) {
 543                 hlen = skb_transport_offset(skb) + tcp_hdrlen(skb);
 544                 phead = skb->data;
 545                 if (unlikely(!skb_pull(skb, hlen))) {
 546                         ipoib_warn(priv, "linear data too small\n");
 547                         ++dev->stats.tx_dropped;
 548                         ++dev->stats.tx_errors;
 549                         dev_kfree_skb_any(skb);
 550                         return;
 551                 }
 552         } else {
 553                 if (unlikely(skb->len > priv->mcast_mtu + IPOIB_ENCAP_LEN)) {
 554                         ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
 555                                    skb->len, priv->mcast_mtu + IPOIB_ENCAP_LEN);
 556                         ++dev->stats.tx_dropped;
 557                         ++dev->stats.tx_errors;
 558                         ipoib_cm_skb_too_long(dev, skb, priv->mcast_mtu);
 559                         return;
 560                 }
 561                 phead = NULL;
 562                 hlen  = 0;
 563         }
 564
 565         ipoib_dbg_data(priv, "sending packet, length=%d address=%p qpn=0x%06x\n",
 566                        skb->len, address, qpn);
 567
 568         /*
 569          * We put the skb into the tx_ring _before_ we call post_send()
 570          * because it's entirely possible that the completion handler will
 571          * run before we execute anything after the post_send().  That
 572          * means we have to make sure everything is properly recorded and
 573          * our state is consistent before we call post_send().
 574          */
 575         tx_req = &priv->tx_ring[priv->tx_head & (ipoib_sendq_size - 1)];
 576         tx_req->skb = skb;
 577         if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req))) {
 578                 ++dev->stats.tx_errors;
 579                 dev_kfree_skb_any(skb);
 580                 return;
 581         }
 582
 583         if (skb->ip_summed == CHECKSUM_PARTIAL)
 584                 priv->tx_wr.wr.send_flags |= IB_SEND_IP_CSUM;
 585         else
 586                 priv->tx_wr.wr.send_flags &= ~IB_SEND_IP_CSUM;
 587
 588         if (++priv->tx_outstanding == ipoib_sendq_size) {
 589                 ipoib_dbg(priv, "TX ring full, stopping kernel net queue\n");
 590                 if (ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP))
 591                         ipoib_warn(priv, "request notify on send CQ failed\n");
 592                 netif_stop_queue(dev);
 593         }
 594
 595         skb_orphan(skb);
 596         skb_dst_drop(skb);
 597
 598         rc = post_send(priv, priv->tx_head & (ipoib_sendq_size - 1),
 599                        address->ah, qpn, tx_req, phead, hlen);
 600         if (unlikely(rc)) {
 601                 ipoib_warn(priv, "post_send failed, error %d\n", rc);
 602                 ++dev->stats.tx_errors;
 603                 --priv->tx_outstanding;
 604                 ipoib_dma_unmap_tx(priv, tx_req);
 605                 dev_kfree_skb_any(skb);
 606                 if (netif_queue_stopped(dev))
 607                         netif_wake_queue(dev);
 608         } else {
 609                 dev->trans_start = jiffies;
 610
 611                 address->last_send = priv->tx_head;
 612                 ++priv->tx_head;
 613         }
 614
 615         if (unlikely(priv->tx_outstanding > MAX_SEND_CQE))
 616                 while (poll_tx(priv))
 617                         ; /* nothing */
 618 }
 619
 620 static void __ipoib_reap_ah(struct net_device *dev)
 621 {
 622         struct ipoib_dev_priv *priv = netdev_priv(dev);
 623         struct ipoib_ah *ah, *tah;
 624         LIST_HEAD(remove_list);
 625         unsigned long flags;
 626
 627         netif_tx_lock_bh(dev);
 628         spin_lock_irqsave(&priv->lock, flags);
 629
 630         list_for_each_entry_safe(ah, tah, &priv->dead_ahs, list)
 631                 if ((int) priv->tx_tail - (int) ah->last_send >= 0) {
 632                         list_del(&ah->list);
 633                         ib_destroy_ah(ah->ah);
 634                         kfree(ah);
 635                 }
 636
 637         spin_unlock_irqrestore(&priv->lock, flags);
 638         netif_tx_unlock_bh(dev);
 639 }
 640
 641 void ipoib_reap_ah(struct work_struct *work)
 642 {
 643         struct ipoib_dev_priv *priv =
 644                 container_of(work, struct ipoib_dev_priv, ah_reap_task.work);
 645         struct net_device *dev = priv->dev;
 646
 647         __ipoib_reap_ah(dev);
 648
 649         if (!test_bit(IPOIB_STOP_REAPER, &priv->flags))
 650                 queue_delayed_work(priv->wq, &priv->ah_reap_task,
 651                                    round_jiffies_relative(HZ));
 652 }
 653
 654 static void ipoib_flush_ah(struct net_device *dev)
 655 {
 656         struct ipoib_dev_priv *priv = netdev_priv(dev);
 657
 658         cancel_delayed_work(&priv->ah_reap_task);
 659         flush_workqueue(priv->wq);
 660         ipoib_reap_ah(&priv->ah_reap_task.work);
 661 }
 662
 663 static void ipoib_stop_ah(struct net_device *dev)
 664 {
 665         struct ipoib_dev_priv *priv = netdev_priv(dev);
 666
 667         set_bit(IPOIB_STOP_REAPER, &priv->flags);
 668         ipoib_flush_ah(dev);
 669 }
 670
 671 static void ipoib_ib_tx_timer_func(unsigned long ctx)
 672 {
 673         drain_tx_cq((struct net_device *)ctx);
 674 }
 675
 676 int ipoib_ib_dev_open(struct net_device *dev)
 677 {
 678         struct ipoib_dev_priv *priv = netdev_priv(dev);
 679         int ret;
 680
 681         ipoib_pkey_dev_check_presence(dev);
 682
 683         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
 684                 ipoib_warn(priv, "P_Key 0x%04x is %s\n", priv->pkey,
 685                            (!(priv->pkey & 0x7fff) ? "Invalid" : "not found"));
 686                 return -1;
 687         }
 688
 689         ret = ipoib_init_qp(dev);
 690         if (ret) {
 691                 ipoib_warn(priv, "ipoib_init_qp returned %d\n", ret);
 692                 return -1;
 693         }
 694
 695         ret = ipoib_ib_post_receives(dev);
 696         if (ret) {
 697                 ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret);
 698                 goto dev_stop;
 699         }
 700
 701         ret = ipoib_cm_dev_open(dev);
 702         if (ret) {
 703                 ipoib_warn(priv, "ipoib_cm_dev_open returned %d\n", ret);
 704                 goto dev_stop;
 705         }
 706
 707         clear_bit(IPOIB_STOP_REAPER, &priv->flags);
 708         queue_delayed_work(priv->wq, &priv->ah_reap_task,
 709                            round_jiffies_relative(HZ));
 710
 711         if (!test_and_set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
 712                 napi_enable(&priv->napi);
 713
 714         return 0;
 715 dev_stop:
 716         if (!test_and_set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
 717                 napi_enable(&priv->napi);
 718         ipoib_ib_dev_stop(dev);
 719         return -1;
 720 }
 721
 722 void ipoib_pkey_dev_check_presence(struct net_device *dev)
 723 {
 724         struct ipoib_dev_priv *priv = netdev_priv(dev);
 725
 726         if (!(priv->pkey & 0x7fff) ||
 727             ib_find_pkey(priv->ca, priv->port, priv->pkey,
 728                          &priv->pkey_index))
 729                 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 730         else
 731                 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 732 }
 733
 734 int ipoib_ib_dev_up(struct net_device *dev)
 735 {
 736         struct ipoib_dev_priv *priv = netdev_priv(dev);
 737
 738         ipoib_pkey_dev_check_presence(dev);
 739
 740         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
 741                 ipoib_dbg(priv, "PKEY is not assigned.\n");
 742                 return 0;
 743         }
 744
 745         set_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
 746
 747         return ipoib_mcast_start_thread(dev);
 748 }
 749
 750 int ipoib_ib_dev_down(struct net_device *dev)
 751 {
 752         struct ipoib_dev_priv *priv = netdev_priv(dev);
 753
 754         ipoib_dbg(priv, "downing ib_dev\n");
 755
 756         clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
 757         netif_carrier_off(dev);
 758
 759         ipoib_mcast_stop_thread(dev);
 760         ipoib_mcast_dev_flush(dev);
 761
 762         ipoib_flush_paths(dev);
 763
 764         return 0;
 765 }
 766
 767 static int recvs_pending(struct net_device *dev)
 768 {
 769         struct ipoib_dev_priv *priv = netdev_priv(dev);
 770         int pending = 0;
 771         int i;
 772
 773         for (i = 0; i < ipoib_recvq_size; ++i)
 774                 if (priv->rx_ring[i].skb)
 775                         ++pending;
 776
 777         return pending;
 778 }
 779
 780 void ipoib_drain_cq(struct net_device *dev)
 781 {
 782         struct ipoib_dev_priv *priv = netdev_priv(dev);
 783         int i, n;
 784
 785         /*
 786          * We call completion handling routines that expect to be
 787          * called from the BH-disabled NAPI poll context, so disable
 788          * BHs here too.
 789          */
 790         local_bh_disable();
 791
 792         do {
 793                 n = ib_poll_cq(priv->recv_cq, IPOIB_NUM_WC, priv->ibwc);
 794                 for (i = 0; i < n; ++i) {
 795                         /*
 796                          * Convert any successful completions to flush
 797                          * errors to avoid passing packets up the
 798                          * stack after bringing the device down.
 799                          */
 800                         if (priv->ibwc[i].status == IB_WC_SUCCESS)
 801                                 priv->ibwc[i].status = IB_WC_WR_FLUSH_ERR;
 802
 803                         if (priv->ibwc[i].wr_id & IPOIB_OP_RECV) {
 804                                 if (priv->ibwc[i].wr_id & IPOIB_OP_CM)
 805                                         ipoib_cm_handle_rx_wc(dev, priv->ibwc + i);
 806                                 else
 807                                         ipoib_ib_handle_rx_wc(dev, priv->ibwc + i);
 808                         } else
 809                                 ipoib_cm_handle_tx_wc(dev, priv->ibwc + i);
 810                 }
 811         } while (n == IPOIB_NUM_WC);
 812
 813         while (poll_tx(priv))
 814                 ; /* nothing */
 815
 816         local_bh_enable();
 817 }
 818
 819 int ipoib_ib_dev_stop(struct net_device *dev)
 820 {
 821         struct ipoib_dev_priv *priv = netdev_priv(dev);
 822         struct ib_qp_attr qp_attr;
 823         unsigned long begin;
 824         struct ipoib_tx_buf *tx_req;
 825         int i;
 826
 827         if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
 828                 napi_disable(&priv->napi);
 829
 830         ipoib_cm_dev_stop(dev);
 831
 832         /*
 833          * Move our QP to the error state and then reinitialize in
 834          * when all work requests have completed or have been flushed.
 835          */
 836         qp_attr.qp_state = IB_QPS_ERR;
 837         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
 838                 ipoib_warn(priv, "Failed to modify QP to ERROR state\n");
 839
 840         /* Wait for all sends and receives to complete */
 841         begin = jiffies;
 842
 843         while (priv->tx_head != priv->tx_tail || recvs_pending(dev)) {
 844                 if (time_after(jiffies, begin + 5 * HZ)) {
 845                         ipoib_warn(priv, "timing out; %d sends %d receives not completed\n",
 846                                    priv->tx_head - priv->tx_tail, recvs_pending(dev));
 847
 848                         /*
 849                          * assume the HW is wedged and just free up
 850                          * all our pending work requests.
 851                          */
 852                         while ((int) priv->tx_tail - (int) priv->tx_head < 0) {
 853                                 tx_req = &priv->tx_ring[priv->tx_tail &
 854                                                         (ipoib_sendq_size - 1)];
 855                                 ipoib_dma_unmap_tx(priv, tx_req);
 856                                 dev_kfree_skb_any(tx_req->skb);
 857                                 ++priv->tx_tail;
 858                                 --priv->tx_outstanding;
 859                         }
 860
 861                         for (i = 0; i < ipoib_recvq_size; ++i) {
 862                                 struct ipoib_rx_buf *rx_req;
 863
 864                                 rx_req = &priv->rx_ring[i];
 865                                 if (!rx_req->skb)
 866                                         continue;
 867                                 ipoib_ud_dma_unmap_rx(priv,
 868                                                       priv->rx_ring[i].mapping);
 869                                 dev_kfree_skb_any(rx_req->skb);
 870                                 rx_req->skb = NULL;
 871                         }
 872
 873                         goto timeout;
 874                 }
 875
 876                 ipoib_drain_cq(dev);
 877
 878                 msleep(1);
 879         }
 880
 881         ipoib_dbg(priv, "All sends and receives done.\n");
 882
 883 timeout:
 884         del_timer_sync(&priv->poll_timer);
 885         qp_attr.qp_state = IB_QPS_RESET;
 886         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
 887                 ipoib_warn(priv, "Failed to modify QP to RESET state\n");
 888
 889         ipoib_flush_ah(dev);
 890
 891         ib_req_notify_cq(priv->recv_cq, IB_CQ_NEXT_COMP);
 892
 893         return 0;
 894 }
 895
 896 int ipoib_ib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
 897 {
 898         struct ipoib_dev_priv *priv = netdev_priv(dev);
 899
 900         priv->ca = ca;
 901         priv->port = port;
 902         priv->qp = NULL;
 903
 904         if (ipoib_transport_dev_init(dev, ca)) {
 905                 printk(KERN_WARNING "%s: ipoib_transport_dev_init failed\n", ca->name);
 906                 return -ENODEV;
 907         }
 908
 909         setup_timer(&priv->poll_timer, ipoib_ib_tx_timer_func,
 910                     (unsigned long) dev);
 911
 912         if (dev->flags & IFF_UP) {
 913                 if (ipoib_ib_dev_open(dev)) {
 914                         ipoib_transport_dev_cleanup(dev);
 915                         return -ENODEV;
 916                 }
 917         }
 918
 919         return 0;
 920 }
 921
 922 /*
 923  * Takes whatever value which is in pkey index 0 and updates priv->pkey
 924  * returns 0 if the pkey value was changed.
 925  */
 926 static inline int update_parent_pkey(struct ipoib_dev_priv *priv)
 927 {
 928         int result;
 929         u16 prev_pkey;
 930
 931         prev_pkey = priv->pkey;
 932         result = ib_query_pkey(priv->ca, priv->port, 0, &priv->pkey);
 933         if (result) {
 934                 ipoib_warn(priv, "ib_query_pkey port %d failed (ret = %d)\n",
 935                            priv->port, result);
 936                 return result;
 937         }
 938
 939         priv->pkey |= 0x8000;
 940
 941         if (prev_pkey != priv->pkey) {
 942                 ipoib_dbg(priv, "pkey changed from 0x%x to 0x%x\n",
 943                           prev_pkey, priv->pkey);
 944                 /*
 945                  * Update the pkey in the broadcast address, while making sure to set
 946                  * the full membership bit, so that we join the right broadcast group.
 947                  */
 948                 priv->dev->broadcast[8] = priv->pkey >> 8;
 949                 priv->dev->broadcast[9] = priv->pkey & 0xff;
 950                 return 0;
 951         }
 952
 953         return 1;
 954 }
 955 /*
 956  * returns 0 if pkey value was found in a different slot.
 957  */
 958 static inline int update_child_pkey(struct ipoib_dev_priv *priv)
 959 {
 960         u16 old_index = priv->pkey_index;
 961
 962         priv->pkey_index = 0;
 963         ipoib_pkey_dev_check_presence(priv->dev);
 964
 965         if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags) &&
 966             (old_index == priv->pkey_index))
 967                 return 1;
 968         return 0;
 969 }
 970
 971 static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv,
 972                                 enum ipoib_flush_level level,
 973                                 int nesting)
 974 {
 975         struct ipoib_dev_priv *cpriv;
 976         struct net_device *dev = priv->dev;
 977         int result;
 978
 979         down_read_nested(&priv->vlan_rwsem, nesting);
 980
 981         /*
 982          * Flush any child interfaces too -- they might be up even if
 983          * the parent is down.
 984          */
 985         list_for_each_entry(cpriv, &priv->child_intfs, list)
 986                 __ipoib_ib_dev_flush(cpriv, level, nesting + 1);
 987
 988         up_read(&priv->vlan_rwsem);
 989
 990         if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags) &&
 991             level != IPOIB_FLUSH_HEAVY) {
 992                 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n");
 993                 return;
 994         }
 995
 996         if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
 997                 /* interface is down. update pkey and leave. */
 998                 if (level == IPOIB_FLUSH_HEAVY) {
 999                         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags))
1000                                 update_parent_pkey(priv);
1001                         else
1002                                 update_child_pkey(priv);
1003                 }
1004                 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n");
1005                 return;
1006         }
1007
1008         if (level == IPOIB_FLUSH_HEAVY) {
1009                 /* child devices chase their origin pkey value, while non-child
1010                  * (parent) devices should always takes what present in pkey index 0
1011                  */
1012                 if (test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
1013                         result = update_child_pkey(priv);
1014                         if (result) {
1015                                 /* restart QP only if P_Key index is changed */
1016                                 ipoib_dbg(priv, "Not flushing - P_Key index not changed.\n");
1017                                 return;
1018                         }
1019
1020                 } else {
1021                         result = update_parent_pkey(priv);
1022                         /* restart QP only if P_Key value changed */
1023                         if (result) {
1024                                 ipoib_dbg(priv, "Not flushing - P_Key value not changed.\n");
1025                                 return;
1026                         }
1027                 }
1028         }
1029
1030         if (level == IPOIB_FLUSH_LIGHT) {
1031                 ipoib_mark_paths_invalid(dev);
1032                 ipoib_mcast_dev_flush(dev);
1033                 ipoib_flush_ah(dev);
1034         }
1035
1036         if (level >= IPOIB_FLUSH_NORMAL)
1037                 ipoib_ib_dev_down(dev);
1038
1039         if (level == IPOIB_FLUSH_HEAVY) {
1040                 if (test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
1041                         ipoib_ib_dev_stop(dev);
1042                 if (ipoib_ib_dev_open(dev) != 0)
1043                         return;
1044                 if (netif_queue_stopped(dev))
1045                         netif_start_queue(dev);
1046         }
1047
1048         /*
1049          * The device could have been brought down between the start and when
1050          * we get here, don't bring it back up if it's not configured up
1051          */
1052         if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
1053                 if (level >= IPOIB_FLUSH_NORMAL)
1054                         ipoib_ib_dev_up(dev);
1055                 ipoib_mcast_restart_task(&priv->restart_task);
1056         }
1057 }
1058
1059 void ipoib_ib_dev_flush_light(struct work_struct *work)
1060 {
1061         struct ipoib_dev_priv *priv =
1062                 container_of(work, struct ipoib_dev_priv, flush_light);
1063
1064         __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_LIGHT, 0);
1065 }
1066
1067 void ipoib_ib_dev_flush_normal(struct work_struct *work)
1068 {
1069         struct ipoib_dev_priv *priv =
1070                 container_of(work, struct ipoib_dev_priv, flush_normal);
1071
1072         __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_NORMAL, 0);
1073 }
1074
1075 void ipoib_ib_dev_flush_heavy(struct work_struct *work)
1076 {
1077         struct ipoib_dev_priv *priv =
1078                 container_of(work, struct ipoib_dev_priv, flush_heavy);
1079
1080         __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_HEAVY, 0);
1081 }
1082
1083 void ipoib_ib_dev_cleanup(struct net_device *dev)
1084 {
1085         struct ipoib_dev_priv *priv = netdev_priv(dev);
1086
1087         ipoib_dbg(priv, "cleaning up ib_dev\n");
1088         /*
1089          * We must make sure there are no more (path) completions
1090          * that may wish to touch priv fields that are no longer valid
1091          */
1092         ipoib_flush_paths(dev);
1093
1094         ipoib_mcast_stop_thread(dev);
1095         ipoib_mcast_dev_flush(dev);
1096
1097         /*
1098          * All of our ah references aren't free until after
1099          * ipoib_mcast_dev_flush(), ipoib_flush_paths, and
1100          * the neighbor garbage collection is stopped and reaped.
1101          * That should all be done now, so make a final ah flush.
1102          */
1103         ipoib_stop_ah(dev);
1104
1105         ipoib_transport_dev_cleanup(dev);
1106 }
1107
1108