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         skb->truesize = SKB_TRUESIZE(skb->len);
 249
 250         ++dev->stats.rx_packets;
 251         dev->stats.rx_bytes += skb->len;
 252
 253         skb->dev = dev;
 254         if ((dev->features & NETIF_F_RXCSUM) &&
 255                         likely(wc->wc_flags & IB_WC_IP_CSUM_OK))
 256                 skb->ip_summed = CHECKSUM_UNNECESSARY;
 257
 258         napi_gro_receive(&priv->napi, skb);
 259
 260 repost:
 261         if (unlikely(ipoib_ib_post_receive(dev, wr_id)))
 262                 ipoib_warn(priv, "ipoib_ib_post_receive failed "
 263                            "for buf %d\n", wr_id);
 264 }
 265
 266 int ipoib_dma_map_tx(struct ib_device *ca, struct ipoib_tx_buf *tx_req)
 267 {
 268         struct sk_buff *skb = tx_req->skb;
 269         u64 *mapping = tx_req->mapping;
 270         int i;
 271         int off;
 272
 273         if (skb_headlen(skb)) {
 274                 mapping[0] = ib_dma_map_single(ca, skb->data, skb_headlen(skb),
 275                                                DMA_TO_DEVICE);
 276                 if (unlikely(ib_dma_mapping_error(ca, mapping[0])))
 277                         return -EIO;
 278
 279                 off = 1;
 280         } else
 281                 off = 0;
 282
 283         for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) {
 284                 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 285                 mapping[i + off] = ib_dma_map_page(ca,
 286                                                  skb_frag_page(frag),
 287                                                  frag->page_offset, skb_frag_size(frag),
 288                                                  DMA_TO_DEVICE);
 289                 if (unlikely(ib_dma_mapping_error(ca, mapping[i + off])))
 290                         goto partial_error;
 291         }
 292         return 0;
 293
 294 partial_error:
 295         for (; i > 0; --i) {
 296                 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i - 1];
 297
 298                 ib_dma_unmap_page(ca, mapping[i - !off], skb_frag_size(frag), DMA_TO_DEVICE);
 299         }
 300
 301         if (off)
 302                 ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE);
 303
 304         return -EIO;
 305 }
 306
 307 void ipoib_dma_unmap_tx(struct ipoib_dev_priv *priv,
 308                         struct ipoib_tx_buf *tx_req)
 309 {
 310         struct sk_buff *skb = tx_req->skb;
 311         u64 *mapping = tx_req->mapping;
 312         int i;
 313         int off;
 314
 315         if (skb_headlen(skb)) {
 316                 ib_dma_unmap_single(priv->ca, mapping[0], skb_headlen(skb),
 317                                     DMA_TO_DEVICE);
 318                 off = 1;
 319         } else
 320                 off = 0;
 321
 322         for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) {
 323                 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 324
 325                 ib_dma_unmap_page(priv->ca, mapping[i + off],
 326                                   skb_frag_size(frag), DMA_TO_DEVICE);
 327         }
 328 }
 329
 330 /*
 331  * As the result of a completion error the QP Can be transferred to SQE states.
 332  * The function checks if the (send)QP is in SQE state and
 333  * moves it back to RTS state, that in order to have it functional again.
 334  */
 335 static void ipoib_qp_state_validate_work(struct work_struct *work)
 336 {
 337         struct ipoib_qp_state_validate *qp_work =
 338                 container_of(work, struct ipoib_qp_state_validate, work);
 339
 340         struct ipoib_dev_priv *priv = qp_work->priv;
 341         struct ib_qp_attr qp_attr;
 342         struct ib_qp_init_attr query_init_attr;
 343         int ret;
 344
 345         ret = ib_query_qp(priv->qp, &qp_attr, IB_QP_STATE, &query_init_attr);
 346         if (ret) {
 347                 ipoib_warn(priv, "%s: Failed to query QP ret: %d\n",
 348                            __func__, ret);
 349                 goto free_res;
 350         }
 351         pr_info("%s: QP: 0x%x is in state: %d\n",
 352                 __func__, priv->qp->qp_num, qp_attr.qp_state);
 353
 354         /* currently support only in SQE->RTS transition*/
 355         if (qp_attr.qp_state == IB_QPS_SQE) {
 356                 qp_attr.qp_state = IB_QPS_RTS;
 357
 358                 ret = ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE);
 359                 if (ret) {
 360                         pr_warn("failed(%d) modify QP:0x%x SQE->RTS\n",
 361                                 ret, priv->qp->qp_num);
 362                         goto free_res;
 363                 }
 364                 pr_info("%s: QP: 0x%x moved from IB_QPS_SQE to IB_QPS_RTS\n",
 365                         __func__, priv->qp->qp_num);
 366         } else {
 367                 pr_warn("QP (%d) will stay in state: %d\n",
 368                         priv->qp->qp_num, qp_attr.qp_state);
 369         }
 370
 371 free_res:
 372         kfree(qp_work);
 373 }
 374
 375 static void ipoib_ib_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
 376 {
 377         struct ipoib_dev_priv *priv = netdev_priv(dev);
 378         unsigned int wr_id = wc->wr_id;
 379         struct ipoib_tx_buf *tx_req;
 380
 381         ipoib_dbg_data(priv, "send completion: id %d, status: %d\n",
 382                        wr_id, wc->status);
 383
 384         if (unlikely(wr_id >= ipoib_sendq_size)) {
 385                 ipoib_warn(priv, "send completion event with wrid %d (> %d)\n",
 386                            wr_id, ipoib_sendq_size);
 387                 return;
 388         }
 389
 390         tx_req = &priv->tx_ring[wr_id];
 391
 392         ipoib_dma_unmap_tx(priv, tx_req);
 393
 394         ++dev->stats.tx_packets;
 395         dev->stats.tx_bytes += tx_req->skb->len;
 396
 397         dev_kfree_skb_any(tx_req->skb);
 398
 399         ++priv->tx_tail;
 400         if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
 401             netif_queue_stopped(dev) &&
 402             test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
 403                 netif_wake_queue(dev);
 404
 405         if (wc->status != IB_WC_SUCCESS &&
 406             wc->status != IB_WC_WR_FLUSH_ERR) {
 407                 struct ipoib_qp_state_validate *qp_work;
 408                 ipoib_warn(priv, "failed send event "
 409                            "(status=%d, wrid=%d vend_err %x)\n",
 410                            wc->status, wr_id, wc->vendor_err);
 411                 qp_work = kzalloc(sizeof(*qp_work), GFP_ATOMIC);
 412                 if (!qp_work) {
 413                         ipoib_warn(priv, "%s Failed alloc ipoib_qp_state_validate for qp: 0x%x\n",
 414                                    __func__, priv->qp->qp_num);
 415                         return;
 416                 }
 417
 418                 INIT_WORK(&qp_work->work, ipoib_qp_state_validate_work);
 419                 qp_work->priv = priv;
 420                 queue_work(priv->wq, &qp_work->work);
 421         }
 422 }
 423
 424 static int poll_tx(struct ipoib_dev_priv *priv)
 425 {
 426         int n, i;
 427
 428         n = ib_poll_cq(priv->send_cq, MAX_SEND_CQE, priv->send_wc);
 429         for (i = 0; i < n; ++i)
 430                 ipoib_ib_handle_tx_wc(priv->dev, priv->send_wc + i);
 431
 432         return n == MAX_SEND_CQE;
 433 }
 434
 435 int ipoib_poll(struct napi_struct *napi, int budget)
 436 {
 437         struct ipoib_dev_priv *priv = container_of(napi, struct ipoib_dev_priv, napi);
 438         struct net_device *dev = priv->dev;
 439         int done;
 440         int t;
 441         int n, i;
 442
 443         done  = 0;
 444
 445 poll_more:
 446         while (done < budget) {
 447                 int max = (budget - done);
 448
 449                 t = min(IPOIB_NUM_WC, max);
 450                 n = ib_poll_cq(priv->recv_cq, t, priv->ibwc);
 451
 452                 for (i = 0; i < n; i++) {
 453                         struct ib_wc *wc = priv->ibwc + i;
 454
 455                         if (wc->wr_id & IPOIB_OP_RECV) {
 456                                 ++done;
 457                                 if (wc->wr_id & IPOIB_OP_CM)
 458                                         ipoib_cm_handle_rx_wc(dev, wc);
 459                                 else
 460                                         ipoib_ib_handle_rx_wc(dev, wc);
 461                         } else
 462                                 ipoib_cm_handle_tx_wc(priv->dev, wc);
 463                 }
 464
 465                 if (n != t)
 466                         break;
 467         }
 468
 469         if (done < budget) {
 470                 napi_complete(napi);
 471                 if (unlikely(ib_req_notify_cq(priv->recv_cq,
 472                                               IB_CQ_NEXT_COMP |
 473                                               IB_CQ_REPORT_MISSED_EVENTS)) &&
 474                     napi_reschedule(napi))
 475                         goto poll_more;
 476         }
 477
 478         return done;
 479 }
 480
 481 void ipoib_ib_completion(struct ib_cq *cq, void *dev_ptr)
 482 {
 483         struct net_device *dev = dev_ptr;
 484         struct ipoib_dev_priv *priv = netdev_priv(dev);
 485
 486         napi_schedule(&priv->napi);
 487 }
 488
 489 static void drain_tx_cq(struct net_device *dev)
 490 {
 491         struct ipoib_dev_priv *priv = netdev_priv(dev);
 492
 493         netif_tx_lock(dev);
 494         while (poll_tx(priv))
 495                 ; /* nothing */
 496
 497         if (netif_queue_stopped(dev))
 498                 mod_timer(&priv->poll_timer, jiffies + 1);
 499
 500         netif_tx_unlock(dev);
 501 }
 502
 503 void ipoib_send_comp_handler(struct ib_cq *cq, void *dev_ptr)
 504 {
 505         struct ipoib_dev_priv *priv = netdev_priv(dev_ptr);
 506
 507         mod_timer(&priv->poll_timer, jiffies);
 508 }
 509
 510 static inline int post_send(struct ipoib_dev_priv *priv,
 511                             unsigned int wr_id,
 512                             struct ib_ah *address, u32 qpn,
 513                             struct ipoib_tx_buf *tx_req,
 514                             void *head, int hlen)
 515 {
 516         struct ib_send_wr *bad_wr;
 517         struct sk_buff *skb = tx_req->skb;
 518
 519         ipoib_build_sge(priv, tx_req);
 520
 521         priv->tx_wr.wr_id            = wr_id;
 522         priv->tx_wr.wr.ud.remote_qpn = qpn;
 523         priv->tx_wr.wr.ud.ah         = address;
 524
 525         if (head) {
 526                 priv->tx_wr.wr.ud.mss    = skb_shinfo(skb)->gso_size;
 527                 priv->tx_wr.wr.ud.header = head;
 528                 priv->tx_wr.wr.ud.hlen   = hlen;
 529                 priv->tx_wr.opcode       = IB_WR_LSO;
 530         } else
 531                 priv->tx_wr.opcode       = IB_WR_SEND;
 532
 533         return ib_post_send(priv->qp, &priv->tx_wr, &bad_wr);
 534 }
 535
 536 void ipoib_send(struct net_device *dev, struct sk_buff *skb,
 537                 struct ipoib_ah *address, u32 qpn)
 538 {
 539         struct ipoib_dev_priv *priv = netdev_priv(dev);
 540         struct ipoib_tx_buf *tx_req;
 541         int hlen, rc;
 542         void *phead;
 543
 544         if (skb_is_gso(skb)) {
 545                 hlen = skb_transport_offset(skb) + tcp_hdrlen(skb);
 546                 phead = skb->data;
 547                 if (unlikely(!skb_pull(skb, hlen))) {
 548                         ipoib_warn(priv, "linear data too small\n");
 549                         ++dev->stats.tx_dropped;
 550                         ++dev->stats.tx_errors;
 551                         dev_kfree_skb_any(skb);
 552                         return;
 553                 }
 554         } else {
 555                 if (unlikely(skb->len > priv->mcast_mtu + IPOIB_ENCAP_LEN)) {
 556                         ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
 557                                    skb->len, priv->mcast_mtu + IPOIB_ENCAP_LEN);
 558                         ++dev->stats.tx_dropped;
 559                         ++dev->stats.tx_errors;
 560                         ipoib_cm_skb_too_long(dev, skb, priv->mcast_mtu);
 561                         return;
 562                 }
 563                 phead = NULL;
 564                 hlen  = 0;
 565         }
 566
 567         ipoib_dbg_data(priv, "sending packet, length=%d address=%p qpn=0x%06x\n",
 568                        skb->len, address, qpn);
 569
 570         /*
 571          * We put the skb into the tx_ring _before_ we call post_send()
 572          * because it's entirely possible that the completion handler will
 573          * run before we execute anything after the post_send().  That
 574          * means we have to make sure everything is properly recorded and
 575          * our state is consistent before we call post_send().
 576          */
 577         tx_req = &priv->tx_ring[priv->tx_head & (ipoib_sendq_size - 1)];
 578         tx_req->skb = skb;
 579         if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req))) {
 580                 ++dev->stats.tx_errors;
 581                 dev_kfree_skb_any(skb);
 582                 return;
 583         }
 584
 585         if (skb->ip_summed == CHECKSUM_PARTIAL)
 586                 priv->tx_wr.send_flags |= IB_SEND_IP_CSUM;
 587         else
 588                 priv->tx_wr.send_flags &= ~IB_SEND_IP_CSUM;
 589
 590         if (++priv->tx_outstanding == ipoib_sendq_size) {
 591                 ipoib_dbg(priv, "TX ring full, stopping kernel net queue\n");
 592                 if (ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP))
 593                         ipoib_warn(priv, "request notify on send CQ failed\n");
 594                 netif_stop_queue(dev);
 595         }
 596
 597         skb_orphan(skb);
 598         skb_dst_drop(skb);
 599
 600         rc = post_send(priv, priv->tx_head & (ipoib_sendq_size - 1),
 601                        address->ah, qpn, tx_req, phead, hlen);
 602         if (unlikely(rc)) {
 603                 ipoib_warn(priv, "post_send failed, error %d\n", rc);
 604                 ++dev->stats.tx_errors;
 605                 --priv->tx_outstanding;
 606                 ipoib_dma_unmap_tx(priv, tx_req);
 607                 dev_kfree_skb_any(skb);
 608                 if (netif_queue_stopped(dev))
 609                         netif_wake_queue(dev);
 610         } else {
 611                 dev->trans_start = jiffies;
 612
 613                 address->last_send = priv->tx_head;
 614                 ++priv->tx_head;
 615         }
 616
 617         if (unlikely(priv->tx_outstanding > MAX_SEND_CQE))
 618                 while (poll_tx(priv))
 619                         ; /* nothing */
 620 }
 621
 622 static void __ipoib_reap_ah(struct net_device *dev)
 623 {
 624         struct ipoib_dev_priv *priv = netdev_priv(dev);
 625         struct ipoib_ah *ah, *tah;
 626         LIST_HEAD(remove_list);
 627         unsigned long flags;
 628
 629         netif_tx_lock_bh(dev);
 630         spin_lock_irqsave(&priv->lock, flags);
 631
 632         list_for_each_entry_safe(ah, tah, &priv->dead_ahs, list)
 633                 if ((int) priv->tx_tail - (int) ah->last_send >= 0) {
 634                         list_del(&ah->list);
 635                         ib_destroy_ah(ah->ah);
 636                         kfree(ah);
 637                 }
 638
 639         spin_unlock_irqrestore(&priv->lock, flags);
 640         netif_tx_unlock_bh(dev);
 641 }
 642
 643 void ipoib_reap_ah(struct work_struct *work)
 644 {
 645         struct ipoib_dev_priv *priv =
 646                 container_of(work, struct ipoib_dev_priv, ah_reap_task.work);
 647         struct net_device *dev = priv->dev;
 648
 649         __ipoib_reap_ah(dev);
 650
 651         if (!test_bit(IPOIB_STOP_REAPER, &priv->flags))
 652                 queue_delayed_work(priv->wq, &priv->ah_reap_task,
 653                                    round_jiffies_relative(HZ));
 654 }
 655
 656 static void ipoib_flush_ah(struct net_device *dev)
 657 {
 658         struct ipoib_dev_priv *priv = netdev_priv(dev);
 659
 660         cancel_delayed_work(&priv->ah_reap_task);
 661         flush_workqueue(priv->wq);
 662         ipoib_reap_ah(&priv->ah_reap_task.work);
 663 }
 664
 665 static void ipoib_stop_ah(struct net_device *dev)
 666 {
 667         struct ipoib_dev_priv *priv = netdev_priv(dev);
 668
 669         set_bit(IPOIB_STOP_REAPER, &priv->flags);
 670         ipoib_flush_ah(dev);
 671 }
 672
 673 static void ipoib_ib_tx_timer_func(unsigned long ctx)
 674 {
 675         drain_tx_cq((struct net_device *)ctx);
 676 }
 677
 678 int ipoib_ib_dev_open(struct net_device *dev)
 679 {
 680         struct ipoib_dev_priv *priv = netdev_priv(dev);
 681         int ret;
 682
 683         ipoib_pkey_dev_check_presence(dev);
 684
 685         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
 686                 ipoib_warn(priv, "P_Key 0x%04x is %s\n", priv->pkey,
 687                            (!(priv->pkey & 0x7fff) ? "Invalid" : "not found"));
 688                 return -1;
 689         }
 690
 691         ret = ipoib_init_qp(dev);
 692         if (ret) {
 693                 ipoib_warn(priv, "ipoib_init_qp returned %d\n", ret);
 694                 return -1;
 695         }
 696
 697         ret = ipoib_ib_post_receives(dev);
 698         if (ret) {
 699                 ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret);
 700                 goto dev_stop;
 701         }
 702
 703         ret = ipoib_cm_dev_open(dev);
 704         if (ret) {
 705                 ipoib_warn(priv, "ipoib_cm_dev_open returned %d\n", ret);
 706                 goto dev_stop;
 707         }
 708
 709         clear_bit(IPOIB_STOP_REAPER, &priv->flags);
 710         queue_delayed_work(priv->wq, &priv->ah_reap_task,
 711                            round_jiffies_relative(HZ));
 712
 713         if (!test_and_set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
 714                 napi_enable(&priv->napi);
 715
 716         return 0;
 717 dev_stop:
 718         if (!test_and_set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
 719                 napi_enable(&priv->napi);
 720         ipoib_ib_dev_stop(dev);
 721         return -1;
 722 }
 723
 724 void ipoib_pkey_dev_check_presence(struct net_device *dev)
 725 {
 726         struct ipoib_dev_priv *priv = netdev_priv(dev);
 727
 728         if (!(priv->pkey & 0x7fff) ||
 729             ib_find_pkey(priv->ca, priv->port, priv->pkey,
 730                          &priv->pkey_index))
 731                 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 732         else
 733                 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 734 }
 735
 736 int ipoib_ib_dev_up(struct net_device *dev)
 737 {
 738         struct ipoib_dev_priv *priv = netdev_priv(dev);
 739
 740         ipoib_pkey_dev_check_presence(dev);
 741
 742         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
 743                 ipoib_dbg(priv, "PKEY is not assigned.\n");
 744                 return 0;
 745         }
 746
 747         set_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
 748
 749         return ipoib_mcast_start_thread(dev);
 750 }
 751
 752 int ipoib_ib_dev_down(struct net_device *dev)
 753 {
 754         struct ipoib_dev_priv *priv = netdev_priv(dev);
 755
 756         ipoib_dbg(priv, "downing ib_dev\n");
 757
 758         clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
 759         netif_carrier_off(dev);
 760
 761         ipoib_mcast_stop_thread(dev);
 762         ipoib_mcast_dev_flush(dev);
 763
 764         ipoib_flush_paths(dev);
 765
 766         return 0;
 767 }
 768
 769 static int recvs_pending(struct net_device *dev)
 770 {
 771         struct ipoib_dev_priv *priv = netdev_priv(dev);
 772         int pending = 0;
 773         int i;
 774
 775         for (i = 0; i < ipoib_recvq_size; ++i)
 776                 if (priv->rx_ring[i].skb)
 777                         ++pending;
 778
 779         return pending;
 780 }
 781
 782 void ipoib_drain_cq(struct net_device *dev)
 783 {
 784         struct ipoib_dev_priv *priv = netdev_priv(dev);
 785         int i, n;
 786
 787         /*
 788          * We call completion handling routines that expect to be
 789          * called from the BH-disabled NAPI poll context, so disable
 790          * BHs here too.
 791          */
 792         local_bh_disable();
 793
 794         do {
 795                 n = ib_poll_cq(priv->recv_cq, IPOIB_NUM_WC, priv->ibwc);
 796                 for (i = 0; i < n; ++i) {
 797                         /*
 798                          * Convert any successful completions to flush
 799                          * errors to avoid passing packets up the
 800                          * stack after bringing the device down.
 801                          */
 802                         if (priv->ibwc[i].status == IB_WC_SUCCESS)
 803                                 priv->ibwc[i].status = IB_WC_WR_FLUSH_ERR;
 804
 805                         if (priv->ibwc[i].wr_id & IPOIB_OP_RECV) {
 806                                 if (priv->ibwc[i].wr_id & IPOIB_OP_CM)
 807                                         ipoib_cm_handle_rx_wc(dev, priv->ibwc + i);
 808                                 else
 809                                         ipoib_ib_handle_rx_wc(dev, priv->ibwc + i);
 810                         } else
 811                                 ipoib_cm_handle_tx_wc(dev, priv->ibwc + i);
 812                 }
 813         } while (n == IPOIB_NUM_WC);
 814
 815         while (poll_tx(priv))
 816                 ; /* nothing */
 817
 818         local_bh_enable();
 819 }
 820
 821 int ipoib_ib_dev_stop(struct net_device *dev)
 822 {
 823         struct ipoib_dev_priv *priv = netdev_priv(dev);
 824         struct ib_qp_attr qp_attr;
 825         unsigned long begin;
 826         struct ipoib_tx_buf *tx_req;
 827         int i;
 828
 829         if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
 830                 napi_disable(&priv->napi);
 831
 832         ipoib_cm_dev_stop(dev);
 833
 834         /*
 835          * Move our QP to the error state and then reinitialize in
 836          * when all work requests have completed or have been flushed.
 837          */
 838         qp_attr.qp_state = IB_QPS_ERR;
 839         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
 840                 ipoib_warn(priv, "Failed to modify QP to ERROR state\n");
 841
 842         /* Wait for all sends and receives to complete */
 843         begin = jiffies;
 844
 845         while (priv->tx_head != priv->tx_tail || recvs_pending(dev)) {
 846                 if (time_after(jiffies, begin + 5 * HZ)) {
 847                         ipoib_warn(priv, "timing out; %d sends %d receives not completed\n",
 848                                    priv->tx_head - priv->tx_tail, recvs_pending(dev));
 849
 850                         /*
 851                          * assume the HW is wedged and just free up
 852                          * all our pending work requests.
 853                          */
 854                         while ((int) priv->tx_tail - (int) priv->tx_head < 0) {
 855                                 tx_req = &priv->tx_ring[priv->tx_tail &
 856                                                         (ipoib_sendq_size - 1)];
 857                                 ipoib_dma_unmap_tx(priv, tx_req);
 858                                 dev_kfree_skb_any(tx_req->skb);
 859                                 ++priv->tx_tail;
 860                                 --priv->tx_outstanding;
 861                         }
 862
 863                         for (i = 0; i < ipoib_recvq_size; ++i) {
 864                                 struct ipoib_rx_buf *rx_req;
 865
 866                                 rx_req = &priv->rx_ring[i];
 867                                 if (!rx_req->skb)
 868                                         continue;
 869                                 ipoib_ud_dma_unmap_rx(priv,
 870                                                       priv->rx_ring[i].mapping);
 871                                 dev_kfree_skb_any(rx_req->skb);
 872                                 rx_req->skb = NULL;
 873                         }
 874
 875                         goto timeout;
 876                 }
 877
 878                 ipoib_drain_cq(dev);
 879
 880                 msleep(1);
 881         }
 882
 883         ipoib_dbg(priv, "All sends and receives done.\n");
 884
 885 timeout:
 886         del_timer_sync(&priv->poll_timer);
 887         qp_attr.qp_state = IB_QPS_RESET;
 888         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
 889                 ipoib_warn(priv, "Failed to modify QP to RESET state\n");
 890
 891         ipoib_flush_ah(dev);
 892
 893         ib_req_notify_cq(priv->recv_cq, IB_CQ_NEXT_COMP);
 894
 895         return 0;
 896 }
 897
 898 int ipoib_ib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
 899 {
 900         struct ipoib_dev_priv *priv = netdev_priv(dev);
 901
 902         priv->ca = ca;
 903         priv->port = port;
 904         priv->qp = NULL;
 905
 906         if (ipoib_transport_dev_init(dev, ca)) {
 907                 printk(KERN_WARNING "%s: ipoib_transport_dev_init failed\n", ca->name);
 908                 return -ENODEV;
 909         }
 910
 911         setup_timer(&priv->poll_timer, ipoib_ib_tx_timer_func,
 912                     (unsigned long) dev);
 913
 914         if (dev->flags & IFF_UP) {
 915                 if (ipoib_ib_dev_open(dev)) {
 916                         ipoib_transport_dev_cleanup(dev);
 917                         return -ENODEV;
 918                 }
 919         }
 920
 921         return 0;
 922 }
 923
 924 /*
 925  * Takes whatever value which is in pkey index 0 and updates priv->pkey
 926  * returns 0 if the pkey value was changed.
 927  */
 928 static inline int update_parent_pkey(struct ipoib_dev_priv *priv)
 929 {
 930         int result;
 931         u16 prev_pkey;
 932
 933         prev_pkey = priv->pkey;
 934         result = ib_query_pkey(priv->ca, priv->port, 0, &priv->pkey);
 935         if (result) {
 936                 ipoib_warn(priv, "ib_query_pkey port %d failed (ret = %d)\n",
 937                            priv->port, result);
 938                 return result;
 939         }
 940
 941         priv->pkey |= 0x8000;
 942
 943         if (prev_pkey != priv->pkey) {
 944                 ipoib_dbg(priv, "pkey changed from 0x%x to 0x%x\n",
 945                           prev_pkey, priv->pkey);
 946                 /*
 947                  * Update the pkey in the broadcast address, while making sure to set
 948                  * the full membership bit, so that we join the right broadcast group.
 949                  */
 950                 priv->dev->broadcast[8] = priv->pkey >> 8;
 951                 priv->dev->broadcast[9] = priv->pkey & 0xff;
 952                 return 0;
 953         }
 954
 955         return 1;
 956 }
 957 /*
 958  * returns 0 if pkey value was found in a different slot.
 959  */
 960 static inline int update_child_pkey(struct ipoib_dev_priv *priv)
 961 {
 962         u16 old_index = priv->pkey_index;
 963
 964         priv->pkey_index = 0;
 965         ipoib_pkey_dev_check_presence(priv->dev);
 966
 967         if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags) &&
 968             (old_index == priv->pkey_index))
 969                 return 1;
 970         return 0;
 971 }
 972
 973 static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv,
 974                                 enum ipoib_flush_level level,
 975                                 int nesting)
 976 {
 977         struct ipoib_dev_priv *cpriv;
 978         struct net_device *dev = priv->dev;
 979         int result;
 980
 981         down_read_nested(&priv->vlan_rwsem, nesting);
 982
 983         /*
 984          * Flush any child interfaces too -- they might be up even if
 985          * the parent is down.
 986          */
 987         list_for_each_entry(cpriv, &priv->child_intfs, list)
 988                 __ipoib_ib_dev_flush(cpriv, level, nesting + 1);
 989
 990         up_read(&priv->vlan_rwsem);
 991
 992         if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags) &&
 993             level != IPOIB_FLUSH_HEAVY) {
 994                 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n");
 995                 return;
 996         }
 997
 998         if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
 999                 /* interface is down. update pkey and leave. */
1000                 if (level == IPOIB_FLUSH_HEAVY) {
1001                         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags))
1002                                 update_parent_pkey(priv);
1003                         else
1004                                 update_child_pkey(priv);
1005                 }
1006                 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n");
1007                 return;
1008         }
1009
1010         if (level == IPOIB_FLUSH_HEAVY) {
1011                 /* child devices chase their origin pkey value, while non-child
1012                  * (parent) devices should always takes what present in pkey index 0
1013                  */
1014                 if (test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
1015                         result = update_child_pkey(priv);
1016                         if (result) {
1017                                 /* restart QP only if P_Key index is changed */
1018                                 ipoib_dbg(priv, "Not flushing - P_Key index not changed.\n");
1019                                 return;
1020                         }
1021
1022                 } else {
1023                         result = update_parent_pkey(priv);
1024                         /* restart QP only if P_Key value changed */
1025                         if (result) {
1026                                 ipoib_dbg(priv, "Not flushing - P_Key value not changed.\n");
1027                                 return;
1028                         }
1029                 }
1030         }
1031
1032         if (level == IPOIB_FLUSH_LIGHT) {
1033                 ipoib_mark_paths_invalid(dev);
1034                 ipoib_mcast_dev_flush(dev);
1035                 ipoib_flush_ah(dev);
1036         }
1037
1038         if (level >= IPOIB_FLUSH_NORMAL)
1039                 ipoib_ib_dev_down(dev);
1040
1041         if (level == IPOIB_FLUSH_HEAVY) {
1042                 if (test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
1043                         ipoib_ib_dev_stop(dev);
1044                 if (ipoib_ib_dev_open(dev) != 0)
1045                         return;
1046                 if (netif_queue_stopped(dev))
1047                         netif_start_queue(dev);
1048         }
1049
1050         /*
1051          * The device could have been brought down between the start and when
1052          * we get here, don't bring it back up if it's not configured up
1053          */
1054         if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
1055                 if (level >= IPOIB_FLUSH_NORMAL)
1056                         ipoib_ib_dev_up(dev);
1057                 ipoib_mcast_restart_task(&priv->restart_task);
1058         }
1059 }
1060
1061 void ipoib_ib_dev_flush_light(struct work_struct *work)
1062 {
1063         struct ipoib_dev_priv *priv =
1064                 container_of(work, struct ipoib_dev_priv, flush_light);
1065
1066         __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_LIGHT, 0);
1067 }
1068
1069 void ipoib_ib_dev_flush_normal(struct work_struct *work)
1070 {
1071         struct ipoib_dev_priv *priv =
1072                 container_of(work, struct ipoib_dev_priv, flush_normal);
1073
1074         __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_NORMAL, 0);
1075 }
1076
1077 void ipoib_ib_dev_flush_heavy(struct work_struct *work)
1078 {
1079         struct ipoib_dev_priv *priv =
1080                 container_of(work, struct ipoib_dev_priv, flush_heavy);
1081
1082         __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_HEAVY, 0);
1083 }
1084
1085 void ipoib_ib_dev_cleanup(struct net_device *dev)
1086 {
1087         struct ipoib_dev_priv *priv = netdev_priv(dev);
1088
1089         ipoib_dbg(priv, "cleaning up ib_dev\n");
1090         /*
1091          * We must make sure there are no more (path) completions
1092          * that may wish to touch priv fields that are no longer valid
1093          */
1094         ipoib_flush_paths(dev);
1095
1096         ipoib_mcast_stop_thread(dev);
1097         ipoib_mcast_dev_flush(dev);
1098
1099         /*
1100          * All of our ah references aren't free until after
1101          * ipoib_mcast_dev_flush(), ipoib_flush_paths, and
1102          * the neighbor garbage collection is stopped and reaped.
1103          * That should all be done now, so make a final ah flush.
1104          */
1105         ipoib_stop_ah(dev);
1106
1107         ipoib_transport_dev_cleanup(dev);
1108 }
1109
1110