sys/ofed/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 "ipoib.h"
  37
  38 #include <rdma/ib_cache.h>
  39
  40 #include <security/mac/mac_framework.h>
  41
  42 #include <linux/delay.h>
  43 #include <linux/dma-mapping.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 ipoib_dev_priv *priv,
  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->priv      = priv;
  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(priv, "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 = ah->priv;
  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 void
  91 ipoib_dma_unmap_rx(struct ipoib_dev_priv *priv, struct ipoib_rx_buf *rx_req)
  92 {
  93         struct mbuf *m;
  94         int i;
  95
  96         for (i = 0, m = rx_req->mb; m != NULL; m = m->m_next, i++)
  97                 ib_dma_unmap_single(priv->ca, rx_req->mapping[i], m->m_len,
  98                     DMA_FROM_DEVICE);
  99 }
 100
 101 void
 102 ipoib_dma_mb(struct ipoib_dev_priv *priv, struct mbuf *mb, unsigned int length)
 103 {
 104
 105         m_adj(mb, -(mb->m_pkthdr.len - length));
 106 }
 107
 108 struct mbuf *
 109 ipoib_alloc_map_mb(struct ipoib_dev_priv *priv, struct ipoib_rx_buf *rx_req,
 110     int size)
 111 {
 112         struct mbuf *mb, *m;
 113         int i, j;
 114
 115         rx_req->mb = NULL;
 116         mb = m_getm2(NULL, size, M_NOWAIT, MT_DATA, M_PKTHDR);
 117         if (mb == NULL)
 118                 return (NULL);
 119         for (i = 0, m = mb; m != NULL; m = m->m_next, i++) {
 120                 m->m_len = (m->m_flags & M_EXT) ? m->m_ext.ext_size :
 121                     ((m->m_flags & M_PKTHDR) ? MHLEN : MLEN);
 122                 mb->m_pkthdr.len += m->m_len;
 123                 rx_req->mapping[i] = ib_dma_map_single(priv->ca,
 124                     mtod(m, void *), m->m_len, DMA_FROM_DEVICE);
 125                 if (unlikely(ib_dma_mapping_error(priv->ca,
 126                     rx_req->mapping[i])))
 127                         goto error;
 128
 129         }
 130         rx_req->mb = mb;
 131         return (mb);
 132 error:
 133         for (j = 0, m = mb; j < i; m = m->m_next, j++)
 134                 ib_dma_unmap_single(priv->ca, rx_req->mapping[j], m->m_len,
 135                     DMA_FROM_DEVICE);
 136         m_freem(mb);
 137         return (NULL);
 138
 139 }
 140
 141 static int ipoib_ib_post_receive(struct ipoib_dev_priv *priv, int id)
 142 {
 143         struct ipoib_rx_buf *rx_req;
 144         struct ib_recv_wr *bad_wr;
 145         struct mbuf *m;
 146         int ret;
 147         int i;
 148
 149         rx_req = &priv->rx_ring[id];
 150         for (m = rx_req->mb, i = 0; m != NULL; m = m->m_next, i++) {
 151                 priv->rx_sge[i].addr = rx_req->mapping[i];
 152                 priv->rx_sge[i].length = m->m_len;
 153         }
 154         priv->rx_wr.num_sge = i;
 155         priv->rx_wr.wr_id = id | IPOIB_OP_RECV;
 156
 157         ret = ib_post_recv(priv->qp, &priv->rx_wr, &bad_wr);
 158         if (unlikely(ret)) {
 159                 ipoib_warn(priv, "receive failed for buf %d (%d)\n", id, ret);
 160                 ipoib_dma_unmap_rx(priv, &priv->rx_ring[id]);
 161                 m_freem(priv->rx_ring[id].mb);
 162                 priv->rx_ring[id].mb = NULL;
 163         }
 164
 165         return ret;
 166 }
 167
 168 static struct mbuf *
 169 ipoib_alloc_rx_mb(struct ipoib_dev_priv *priv, int id)
 170 {
 171
 172         return ipoib_alloc_map_mb(priv, &priv->rx_ring[id],
 173             priv->max_ib_mtu + IB_GRH_BYTES);
 174 }
 175
 176 static int ipoib_ib_post_receives(struct ipoib_dev_priv *priv)
 177 {
 178         int i;
 179
 180         for (i = 0; i < ipoib_recvq_size; ++i) {
 181                 if (!ipoib_alloc_rx_mb(priv, i)) {
 182                         ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
 183                         return -ENOMEM;
 184                 }
 185                 if (ipoib_ib_post_receive(priv, i)) {
 186                         ipoib_warn(priv, "ipoib_ib_post_receive failed for buf %d\n", i);
 187                         return -EIO;
 188                 }
 189         }
 190
 191         return 0;
 192 }
 193
 194 static void
 195 ipoib_ib_handle_rx_wc(struct ipoib_dev_priv *priv, struct ib_wc *wc)
 196 {
 197         struct ipoib_rx_buf saverx;
 198         unsigned int wr_id = wc->wr_id & ~IPOIB_OP_RECV;
 199         struct ifnet *dev = priv->dev;
 200         struct ipoib_header *eh;
 201         struct mbuf *mb;
 202
 203         ipoib_dbg_data(priv, "recv completion: id %d, status: %d\n",
 204                        wr_id, wc->status);
 205
 206         if (unlikely(wr_id >= ipoib_recvq_size)) {
 207                 ipoib_warn(priv, "recv completion event with wrid %d (> %d)\n",
 208                            wr_id, ipoib_recvq_size);
 209                 return;
 210         }
 211
 212         mb  = priv->rx_ring[wr_id].mb;
 213
 214         if (unlikely(wc->status != IB_WC_SUCCESS)) {
 215                 if (wc->status != IB_WC_WR_FLUSH_ERR) {
 216                         ipoib_warn(priv, "failed recv event "
 217                                    "(status=%d, wrid=%d vend_err %x)\n",
 218                                    wc->status, wr_id, wc->vendor_err);
 219                         goto repost;
 220                 }
 221                 if (mb) {
 222                         ipoib_dma_unmap_rx(priv, &priv->rx_ring[wr_id]);
 223                         m_freem(mb);
 224                         priv->rx_ring[wr_id].mb = NULL;
 225                 }
 226                 return;
 227         }
 228
 229         /*
 230          * Drop packets that this interface sent, ie multicast packets
 231          * that the HCA has replicated.
 232          */
 233         if (wc->slid == priv->local_lid && wc->src_qp == priv->qp->qp_num)
 234                 goto repost;
 235
 236         memcpy(&saverx, &priv->rx_ring[wr_id], sizeof(saverx));
 237         /*
 238          * If we can't allocate a new RX buffer, dump
 239          * this packet and reuse the old buffer.
 240          */
 241         if (unlikely(!ipoib_alloc_rx_mb(priv, wr_id))) {
 242                 memcpy(&priv->rx_ring[wr_id], &saverx, sizeof(saverx));
 243                 dev->if_iqdrops++;
 244                 goto repost;
 245         }
 246
 247         ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
 248                        wc->byte_len, wc->slid);
 249
 250         ipoib_dma_unmap_rx(priv, &saverx);
 251         ipoib_dma_mb(priv, mb, wc->byte_len);
 252
 253         ++dev->if_ipackets;
 254         dev->if_ibytes += mb->m_pkthdr.len;
 255         mb->m_pkthdr.rcvif = dev;
 256         m_adj(mb, sizeof(struct ib_grh) - INFINIBAND_ALEN);
 257         eh = mtod(mb, struct ipoib_header *);
 258         bzero(eh->hwaddr, 4);   /* Zero the queue pair, only dgid is in grh */
 259
 260         if (test_bit(IPOIB_FLAG_CSUM, &priv->flags) && likely(wc->csum_ok))
 261                 mb->m_pkthdr.csum_flags = CSUM_IP_CHECKED | CSUM_IP_VALID;
 262
 263         dev->if_input(dev, mb);
 264
 265 repost:
 266         if (unlikely(ipoib_ib_post_receive(priv, wr_id)))
 267                 ipoib_warn(priv, "ipoib_ib_post_receive failed "
 268                            "for buf %d\n", wr_id);
 269 }
 270
 271 int ipoib_dma_map_tx(struct ib_device *ca, struct ipoib_tx_buf *tx_req, int max)
 272 {
 273         struct mbuf *mb = tx_req->mb;
 274         u64 *mapping = tx_req->mapping;
 275         struct mbuf *m, *p;
 276         int error;
 277         int i;
 278
 279         for (m = mb, p = NULL, i = 0; m != NULL; p = m, m = m->m_next, i++) {
 280                 if (m->m_len != 0)
 281                         continue;
 282                 if (p == NULL)
 283                         panic("ipoib_dma_map_tx: First mbuf empty\n");
 284                 p->m_next = m_free(m);
 285                 m = p;
 286                 i--;
 287         }
 288         i--;
 289         if (i >= max) {
 290                 tx_req->mb = mb = m_defrag(mb, M_NOWAIT);
 291                 if (mb == NULL)
 292                         return -EIO;
 293                 for (m = mb, i = 0; m != NULL; m = m->m_next, i++);
 294                 if (i >= max)
 295                         return -EIO;
 296         }
 297         error = 0;
 298         for (m = mb, i = 0; m != NULL; m = m->m_next, i++) {
 299                 mapping[i] = ib_dma_map_single(ca, mtod(m, void *),
 300                                                m->m_len, DMA_TO_DEVICE);
 301                 if (unlikely(ib_dma_mapping_error(ca, mapping[i]))) {
 302                         error = -EIO;
 303                         break;
 304                 }
 305         }
 306         if (error) {
 307                 int end;
 308
 309                 end = i;
 310                 for (m = mb, i = 0; i < end; m = m->m_next, i++)
 311                         ib_dma_unmap_single(ca, mapping[i], m->m_len,
 312                                             DMA_TO_DEVICE);
 313         }
 314         return error;
 315 }
 316
 317 void ipoib_dma_unmap_tx(struct ib_device *ca, struct ipoib_tx_buf *tx_req)
 318 {
 319         struct mbuf *mb = tx_req->mb;
 320         u64 *mapping = tx_req->mapping;
 321         struct mbuf *m;
 322         int i;
 323
 324         for (m = mb, i = 0; m != NULL; m = m->m_next, i++)
 325                 ib_dma_unmap_single(ca, mapping[i], m->m_len, DMA_TO_DEVICE);
 326 }
 327
 328 static void ipoib_ib_handle_tx_wc(struct ipoib_dev_priv *priv, struct ib_wc *wc)
 329 {
 330         struct ifnet *dev = priv->dev;
 331         unsigned int wr_id = wc->wr_id;
 332         struct ipoib_tx_buf *tx_req;
 333
 334         ipoib_dbg_data(priv, "send completion: id %d, status: %d\n",
 335                        wr_id, wc->status);
 336
 337         if (unlikely(wr_id >= ipoib_sendq_size)) {
 338                 ipoib_warn(priv, "send completion event with wrid %d (> %d)\n",
 339                            wr_id, ipoib_sendq_size);
 340                 return;
 341         }
 342
 343         tx_req = &priv->tx_ring[wr_id];
 344
 345         ipoib_dma_unmap_tx(priv->ca, tx_req);
 346
 347         ++dev->if_opackets;
 348
 349         m_freem(tx_req->mb);
 350
 351         ++priv->tx_tail;
 352         if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
 353             (dev->if_drv_flags & IFF_DRV_OACTIVE) &&
 354             test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
 355                 dev->if_drv_flags &= ~IFF_DRV_OACTIVE;
 356
 357         if (wc->status != IB_WC_SUCCESS &&
 358             wc->status != IB_WC_WR_FLUSH_ERR)
 359                 ipoib_warn(priv, "failed send event "
 360                            "(status=%d, wrid=%d vend_err %x)\n",
 361                            wc->status, wr_id, wc->vendor_err);
 362 }
 363
 364 int
 365 ipoib_poll_tx(struct ipoib_dev_priv *priv)
 366 {
 367         int n, i;
 368
 369         n = ib_poll_cq(priv->send_cq, MAX_SEND_CQE, priv->send_wc);
 370         for (i = 0; i < n; ++i) {
 371                 struct ib_wc *wc = priv->send_wc + i;
 372                 if (wc->wr_id & IPOIB_OP_CM)
 373                         ipoib_cm_handle_tx_wc(priv, wc);
 374                 else
 375                         ipoib_ib_handle_tx_wc(priv, wc);
 376         }
 377
 378         return n == MAX_SEND_CQE;
 379 }
 380
 381 static void
 382 ipoib_poll(struct ipoib_dev_priv *priv)
 383 {
 384         int n, i;
 385
 386 poll_more:
 387         for (;;) {
 388                 n = ib_poll_cq(priv->recv_cq, IPOIB_NUM_WC, priv->ibwc);
 389
 390                 for (i = 0; i < n; i++) {
 391                         struct ib_wc *wc = priv->ibwc + i;
 392
 393                         if ((wc->wr_id & IPOIB_OP_RECV) == 0)
 394                                 panic("ipoib_poll: Bad wr_id 0x%jX\n",
 395                                     (intmax_t)wc->wr_id);
 396                         if (wc->wr_id & IPOIB_OP_CM)
 397                                 ipoib_cm_handle_rx_wc(priv, wc);
 398                         else
 399                                 ipoib_ib_handle_rx_wc(priv, wc);
 400                 }
 401
 402                 if (n != IPOIB_NUM_WC)
 403                         break;
 404         }
 405
 406         if (ib_req_notify_cq(priv->recv_cq,
 407             IB_CQ_NEXT_COMP | IB_CQ_REPORT_MISSED_EVENTS))
 408                 goto poll_more;
 409 }
 410
 411 void ipoib_ib_completion(struct ib_cq *cq, void *dev_ptr)
 412 {
 413         struct ipoib_dev_priv *priv = dev_ptr;
 414
 415         ipoib_poll(priv);
 416 }
 417
 418 static void drain_tx_cq(struct ipoib_dev_priv *priv)
 419 {
 420         struct ifnet *dev = priv->dev;
 421
 422         spin_lock(&priv->lock);
 423         while (ipoib_poll_tx(priv))
 424                 ; /* nothing */
 425
 426         if (dev->if_drv_flags & IFF_DRV_OACTIVE)
 427                 mod_timer(&priv->poll_timer, jiffies + 1);
 428
 429         spin_unlock(&priv->lock);
 430 }
 431
 432 void ipoib_send_comp_handler(struct ib_cq *cq, void *dev_ptr)
 433 {
 434         struct ipoib_dev_priv *priv = dev_ptr;
 435
 436         mod_timer(&priv->poll_timer, jiffies);
 437 }
 438
 439 static inline int
 440 post_send(struct ipoib_dev_priv *priv, unsigned int wr_id,
 441     struct ib_ah *address, u32 qpn, struct ipoib_tx_buf *tx_req, void *head,
 442     int hlen)
 443 {
 444         struct ib_send_wr *bad_wr;
 445         struct mbuf *mb = tx_req->mb;
 446         u64 *mapping = tx_req->mapping;
 447         struct mbuf *m;
 448         int i;
 449
 450         for (m = mb, i = 0; m != NULL; m = m->m_next, i++) {
 451                 priv->tx_sge[i].addr         = mapping[i];
 452                 priv->tx_sge[i].length       = m->m_len;
 453         }
 454         priv->tx_wr.num_sge          = i;
 455         priv->tx_wr.wr_id            = wr_id;
 456         priv->tx_wr.wr.ud.remote_qpn = qpn;
 457         priv->tx_wr.wr.ud.ah         = address;
 458
 459
 460         if (head) {
 461                 priv->tx_wr.wr.ud.mss    = 0; /* XXX mb_shinfo(mb)->gso_size; */
 462                 priv->tx_wr.wr.ud.header = head;
 463                 priv->tx_wr.wr.ud.hlen   = hlen;
 464                 priv->tx_wr.opcode       = IB_WR_LSO;
 465         } else
 466                 priv->tx_wr.opcode       = IB_WR_SEND;
 467
 468         return ib_post_send(priv->qp, &priv->tx_wr, &bad_wr);
 469 }
 470
 471 void
 472 ipoib_send(struct ipoib_dev_priv *priv, struct mbuf *mb,
 473     struct ipoib_ah *address, u32 qpn)
 474 {
 475         struct ifnet *dev = priv->dev;
 476         struct ipoib_tx_buf *tx_req;
 477         int hlen;
 478         void *phead;
 479
 480         if (unlikely(priv->tx_outstanding > MAX_SEND_CQE))
 481                 while (ipoib_poll_tx(priv))
 482                         ; /* nothing */
 483
 484         m_adj(mb, sizeof (struct ipoib_pseudoheader));
 485         if (0 /* XXX segment offload mb_is_gso(mb) */) {
 486                 /* XXX hlen = mb_transport_offset(mb) + tcp_hdrlen(mb); */
 487                 phead = mtod(mb, void *);
 488                 if (mb->m_len < hlen) {
 489                         ipoib_warn(priv, "linear data too small\n");
 490                         ++dev->if_oerrors;
 491                         m_freem(mb);
 492                         return;
 493                 }
 494                 m_adj(mb, hlen);
 495         } else {
 496                 if (unlikely(mb->m_pkthdr.len - IPOIB_ENCAP_LEN > priv->mcast_mtu)) {
 497                         ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
 498                                    mb->m_pkthdr.len, priv->mcast_mtu);
 499                         ++dev->if_oerrors;
 500                         ipoib_cm_mb_too_long(priv, mb, priv->mcast_mtu);
 501                         return;
 502                 }
 503                 phead = NULL;
 504                 hlen  = 0;
 505         }
 506
 507         ipoib_dbg_data(priv, "sending packet, length=%d address=%p qpn=0x%06x\n",
 508                        mb->m_pkthdr.len, address, qpn);
 509
 510         /*
 511          * We put the mb into the tx_ring _before_ we call post_send()
 512          * because it's entirely possible that the completion handler will
 513          * run before we execute anything after the post_send().  That
 514          * means we have to make sure everything is properly recorded and
 515          * our state is consistent before we call post_send().
 516          */
 517         tx_req = &priv->tx_ring[priv->tx_head & (ipoib_sendq_size - 1)];
 518         tx_req->mb = mb;
 519         if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req, IPOIB_UD_TX_SG))) {
 520                 ++dev->if_oerrors;
 521                 if (tx_req->mb)
 522                         m_freem(tx_req->mb);
 523                 return;
 524         }
 525
 526         if (mb->m_pkthdr.csum_flags & (CSUM_IP|CSUM_TCP|CSUM_UDP))
 527                 priv->tx_wr.send_flags |= IB_SEND_IP_CSUM;
 528         else
 529                 priv->tx_wr.send_flags &= ~IB_SEND_IP_CSUM;
 530
 531         if (++priv->tx_outstanding == ipoib_sendq_size) {
 532                 ipoib_dbg(priv, "TX ring full, stopping kernel net queue\n");
 533                 if (ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP))
 534                         ipoib_warn(priv, "request notify on send CQ failed\n");
 535                 dev->if_drv_flags |= IFF_DRV_OACTIVE;
 536         }
 537
 538         if (unlikely(post_send(priv,
 539             priv->tx_head & (ipoib_sendq_size - 1), address->ah, qpn,
 540             tx_req, phead, hlen))) {
 541                 ipoib_warn(priv, "post_send failed\n");
 542                 ++dev->if_oerrors;
 543                 --priv->tx_outstanding;
 544                 ipoib_dma_unmap_tx(priv->ca, tx_req);
 545                 m_freem(mb);
 546                 if (dev->if_drv_flags & IFF_DRV_OACTIVE)
 547                         dev->if_drv_flags &= ~IFF_DRV_OACTIVE;
 548         } else {
 549                 address->last_send = priv->tx_head;
 550                 ++priv->tx_head;
 551         }
 552 }
 553
 554 static void __ipoib_reap_ah(struct ipoib_dev_priv *priv)
 555 {
 556         struct ipoib_ah *ah, *tah;
 557         LIST_HEAD(remove_list);
 558         unsigned long flags;
 559
 560         spin_lock_irqsave(&priv->lock, flags);
 561
 562         list_for_each_entry_safe(ah, tah, &priv->dead_ahs, list)
 563                 if ((int) priv->tx_tail - (int) ah->last_send >= 0) {
 564                         list_del(&ah->list);
 565                         ib_destroy_ah(ah->ah);
 566                         kfree(ah);
 567                 }
 568
 569         spin_unlock_irqrestore(&priv->lock, flags);
 570 }
 571
 572 void ipoib_reap_ah(struct work_struct *work)
 573 {
 574         struct ipoib_dev_priv *priv =
 575                 container_of(work, struct ipoib_dev_priv, ah_reap_task.work);
 576
 577         __ipoib_reap_ah(priv);
 578
 579         if (!test_bit(IPOIB_STOP_REAPER, &priv->flags))
 580                 queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task,
 581                                    HZ);
 582 }
 583
 584 static void ipoib_ah_dev_cleanup(struct ipoib_dev_priv *priv)
 585 {
 586         unsigned long begin;
 587
 588         begin = jiffies;
 589
 590         while (!list_empty(&priv->dead_ahs)) {
 591                 __ipoib_reap_ah(priv);
 592
 593                 if (time_after(jiffies, begin + HZ)) {
 594                         ipoib_warn(priv, "timing out; will leak address handles\n");
 595                         break;
 596                 }
 597
 598                 msleep(1);
 599         }
 600 }
 601
 602 static void ipoib_ib_tx_timer_func(unsigned long ctx)
 603 {
 604         drain_tx_cq((struct ipoib_dev_priv *)ctx);
 605 }
 606
 607 int ipoib_ib_dev_open(struct ipoib_dev_priv *priv)
 608 {
 609         int ret;
 610
 611         if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &priv->pkey_index)) {
 612                 ipoib_warn(priv, "P_Key 0x%04x not found\n", priv->pkey);
 613                 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 614                 return -1;
 615         }
 616         set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 617
 618         ret = ipoib_init_qp(priv);
 619         if (ret) {
 620                 ipoib_warn(priv, "ipoib_init_qp returned %d\n", ret);
 621                 return -1;
 622         }
 623
 624         ret = ipoib_ib_post_receives(priv);
 625         if (ret) {
 626                 ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret);
 627                 ipoib_ib_dev_stop(priv, 1);
 628                 return -1;
 629         }
 630
 631         ret = ipoib_cm_dev_open(priv);
 632         if (ret) {
 633                 ipoib_warn(priv, "ipoib_cm_dev_open returned %d\n", ret);
 634                 ipoib_ib_dev_stop(priv, 1);
 635                 return -1;
 636         }
 637
 638         clear_bit(IPOIB_STOP_REAPER, &priv->flags);
 639         queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task, HZ);
 640
 641         return 0;
 642 }
 643
 644 static void ipoib_pkey_dev_check_presence(struct ipoib_dev_priv *priv)
 645 {
 646         u16 pkey_index = 0;
 647
 648         if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &pkey_index))
 649                 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 650         else
 651                 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 652 }
 653
 654 int ipoib_ib_dev_up(struct ipoib_dev_priv *priv)
 655 {
 656
 657         ipoib_pkey_dev_check_presence(priv);
 658
 659         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
 660                 ipoib_dbg(priv, "PKEY is not assigned.\n");
 661                 return 0;
 662         }
 663
 664         set_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
 665
 666         return ipoib_mcast_start_thread(priv);
 667 }
 668
 669 int ipoib_ib_dev_down(struct ipoib_dev_priv *priv, int flush)
 670 {
 671
 672         ipoib_dbg(priv, "downing ib_dev\n");
 673
 674         clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
 675         if_link_state_change(priv->dev, LINK_STATE_DOWN);
 676
 677         /* Shutdown the P_Key thread if still active */
 678         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
 679                 mutex_lock(&pkey_mutex);
 680                 set_bit(IPOIB_PKEY_STOP, &priv->flags);
 681                 cancel_delayed_work(&priv->pkey_poll_task);
 682                 mutex_unlock(&pkey_mutex);
 683                 if (flush)
 684                         flush_workqueue(ipoib_workqueue);
 685         }
 686
 687         ipoib_mcast_stop_thread(priv, flush);
 688         ipoib_mcast_dev_flush(priv);
 689
 690         ipoib_flush_paths(priv);
 691
 692         return 0;
 693 }
 694
 695 static int recvs_pending(struct ipoib_dev_priv *priv)
 696 {
 697         int pending = 0;
 698         int i;
 699
 700         for (i = 0; i < ipoib_recvq_size; ++i)
 701                 if (priv->rx_ring[i].mb)
 702                         ++pending;
 703
 704         return pending;
 705 }
 706
 707 void ipoib_drain_cq(struct ipoib_dev_priv *priv)
 708 {
 709         int i, n;
 710
 711         do {
 712                 n = ib_poll_cq(priv->recv_cq, IPOIB_NUM_WC, priv->ibwc);
 713                 for (i = 0; i < n; ++i) {
 714                         /*
 715                          * Convert any successful completions to flush
 716                          * errors to avoid passing packets up the
 717                          * stack after bringing the device down.
 718                          */
 719                         if (priv->ibwc[i].status == IB_WC_SUCCESS)
 720                                 priv->ibwc[i].status = IB_WC_WR_FLUSH_ERR;
 721
 722                         if ((priv->ibwc[i].wr_id & IPOIB_OP_RECV) == 0)
 723                                 panic("ipoib_drain_cq:  Bad wrid 0x%jX\n",
 724                                     (intmax_t)priv->ibwc[i].wr_id);
 725                         if (priv->ibwc[i].wr_id & IPOIB_OP_CM)
 726                                 ipoib_cm_handle_rx_wc(priv, priv->ibwc + i);
 727                         else
 728                                 ipoib_ib_handle_rx_wc(priv, priv->ibwc + i);
 729                 }
 730         } while (n == IPOIB_NUM_WC);
 731
 732         spin_lock(&priv->lock);
 733         while (ipoib_poll_tx(priv))
 734                 ; /* nothing */
 735
 736         spin_unlock(&priv->lock);
 737 }
 738
 739 int ipoib_ib_dev_stop(struct ipoib_dev_priv *priv, int flush)
 740 {
 741         struct ib_qp_attr qp_attr;
 742         unsigned long begin;
 743         struct ipoib_tx_buf *tx_req;
 744         int i;
 745
 746         ipoib_cm_dev_stop(priv);
 747
 748         /*
 749          * Move our QP to the error state and then reinitialize in
 750          * when all work requests have completed or have been flushed.
 751          */
 752         qp_attr.qp_state = IB_QPS_ERR;
 753         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
 754                 ipoib_warn(priv, "Failed to modify QP to ERROR state\n");
 755
 756         /* Wait for all sends and receives to complete */
 757         begin = jiffies;
 758
 759         while (priv->tx_head != priv->tx_tail || recvs_pending(priv)) {
 760                 if (time_after(jiffies, begin + 5 * HZ)) {
 761                         ipoib_warn(priv, "timing out; %d sends %d receives not completed\n",
 762                                    priv->tx_head - priv->tx_tail, recvs_pending(priv));
 763
 764                         /*
 765                          * assume the HW is wedged and just free up
 766                          * all our pending work requests.
 767                          */
 768                         while ((int) priv->tx_tail - (int) priv->tx_head < 0) {
 769                                 tx_req = &priv->tx_ring[priv->tx_tail &
 770                                                         (ipoib_sendq_size - 1)];
 771                                 ipoib_dma_unmap_tx(priv->ca, tx_req);
 772                                 m_freem(tx_req->mb);
 773                                 ++priv->tx_tail;
 774                                 --priv->tx_outstanding;
 775                         }
 776
 777                         for (i = 0; i < ipoib_recvq_size; ++i) {
 778                                 struct ipoib_rx_buf *rx_req;
 779
 780                                 rx_req = &priv->rx_ring[i];
 781                                 if (!rx_req->mb)
 782                                         continue;
 783                                 ipoib_dma_unmap_rx(priv, &priv->rx_ring[i]);
 784                                 m_freem(rx_req->mb);
 785                                 rx_req->mb = NULL;
 786                         }
 787
 788                         goto timeout;
 789                 }
 790
 791                 ipoib_drain_cq(priv);
 792
 793                 msleep(1);
 794         }
 795
 796         ipoib_dbg(priv, "All sends and receives done.\n");
 797
 798 timeout:
 799         del_timer_sync(&priv->poll_timer);
 800         qp_attr.qp_state = IB_QPS_RESET;
 801         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
 802                 ipoib_warn(priv, "Failed to modify QP to RESET state\n");
 803
 804         /* Wait for all AHs to be reaped */
 805         set_bit(IPOIB_STOP_REAPER, &priv->flags);
 806         cancel_delayed_work(&priv->ah_reap_task);
 807         if (flush)
 808                 flush_workqueue(ipoib_workqueue);
 809
 810         ipoib_ah_dev_cleanup(priv);
 811
 812         ib_req_notify_cq(priv->recv_cq, IB_CQ_NEXT_COMP);
 813
 814         return 0;
 815 }
 816
 817 int ipoib_ib_dev_init(struct ipoib_dev_priv *priv, struct ib_device *ca, int port)
 818 {
 819         struct ifnet *dev = priv->dev;
 820
 821         priv->ca = ca;
 822         priv->port = port;
 823         priv->qp = NULL;
 824
 825         if (ipoib_transport_dev_init(priv, ca)) {
 826                 printk(KERN_WARNING "%s: ipoib_transport_dev_init failed\n", ca->name);
 827                 return -ENODEV;
 828         }
 829
 830         setup_timer(&priv->poll_timer, ipoib_ib_tx_timer_func,
 831                     (unsigned long) priv);
 832
 833         if (dev->if_flags & IFF_UP) {
 834                 if (ipoib_ib_dev_open(priv)) {
 835                         ipoib_transport_dev_cleanup(priv);
 836                         return -ENODEV;
 837                 }
 838         }
 839
 840         return 0;
 841 }
 842
 843 static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv,
 844                                 enum ipoib_flush_level level)
 845 {
 846         struct ipoib_dev_priv *cpriv;
 847         u16 new_index;
 848
 849         mutex_lock(&priv->vlan_mutex);
 850
 851         /*
 852          * Flush any child interfaces too -- they might be up even if
 853          * the parent is down.
 854          */
 855         list_for_each_entry(cpriv, &priv->child_intfs, list)
 856                 __ipoib_ib_dev_flush(cpriv, level);
 857
 858         mutex_unlock(&priv->vlan_mutex);
 859
 860         if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) {
 861                 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n");
 862                 return;
 863         }
 864
 865         if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
 866                 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n");
 867                 return;
 868         }
 869
 870         if (level == IPOIB_FLUSH_HEAVY) {
 871                 if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &new_index)) {
 872                         clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 873                         ipoib_ib_dev_down(priv, 0);
 874                         ipoib_ib_dev_stop(priv, 0);
 875                         if (ipoib_pkey_dev_delay_open(priv))
 876                                 return;
 877                 }
 878
 879                 /* restart QP only if P_Key index is changed */
 880                 if (test_and_set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags) &&
 881                     new_index == priv->pkey_index) {
 882                         ipoib_dbg(priv, "Not flushing - P_Key index not changed.\n");
 883                         return;
 884                 }
 885                 priv->pkey_index = new_index;
 886         }
 887
 888         if (level == IPOIB_FLUSH_LIGHT) {
 889                 ipoib_mark_paths_invalid(priv);
 890                 ipoib_mcast_dev_flush(priv);
 891         }
 892
 893         if (level >= IPOIB_FLUSH_NORMAL)
 894                 ipoib_ib_dev_down(priv, 0);
 895
 896         if (level == IPOIB_FLUSH_HEAVY) {
 897                 ipoib_ib_dev_stop(priv, 0);
 898                 ipoib_ib_dev_open(priv);
 899         }
 900
 901         /*
 902          * The device could have been brought down between the start and when
 903          * we get here, don't bring it back up if it's not configured up
 904          */
 905         if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
 906                 if (level >= IPOIB_FLUSH_NORMAL)
 907                         ipoib_ib_dev_up(priv);
 908                 ipoib_mcast_restart_task(&priv->restart_task);
 909         }
 910 }
 911
 912 void ipoib_ib_dev_flush_light(struct work_struct *work)
 913 {
 914         struct ipoib_dev_priv *priv =
 915                 container_of(work, struct ipoib_dev_priv, flush_light);
 916
 917         __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_LIGHT);
 918 }
 919
 920 void ipoib_ib_dev_flush_normal(struct work_struct *work)
 921 {
 922         struct ipoib_dev_priv *priv =
 923                 container_of(work, struct ipoib_dev_priv, flush_normal);
 924
 925         __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_NORMAL);
 926 }
 927
 928 void ipoib_ib_dev_flush_heavy(struct work_struct *work)
 929 {
 930         struct ipoib_dev_priv *priv =
 931                 container_of(work, struct ipoib_dev_priv, flush_heavy);
 932
 933         __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_HEAVY);
 934 }
 935
 936 void ipoib_ib_dev_cleanup(struct ipoib_dev_priv *priv)
 937 {
 938
 939         ipoib_dbg(priv, "cleaning up ib_dev\n");
 940
 941         ipoib_mcast_stop_thread(priv, 1);
 942         ipoib_mcast_dev_flush(priv);
 943
 944         ipoib_ah_dev_cleanup(priv);
 945         ipoib_transport_dev_cleanup(priv);
 946 }
 947
 948 /*
 949  * Delayed P_Key Assigment Interim Support
 950  *
 951  * The following is initial implementation of delayed P_Key assigment
 952  * mechanism. It is using the same approach implemented for the multicast
 953  * group join. The single goal of this implementation is to quickly address
 954  * Bug #2507. This implementation will probably be removed when the P_Key
 955  * change async notification is available.
 956  */
 957
 958 void ipoib_pkey_poll(struct work_struct *work)
 959 {
 960         struct ipoib_dev_priv *priv =
 961                 container_of(work, struct ipoib_dev_priv, pkey_poll_task.work);
 962
 963         ipoib_pkey_dev_check_presence(priv);
 964
 965         if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags))
 966                 ipoib_open(priv);
 967         else {
 968                 mutex_lock(&pkey_mutex);
 969                 if (!test_bit(IPOIB_PKEY_STOP, &priv->flags))
 970                         queue_delayed_work(ipoib_workqueue,
 971                                            &priv->pkey_poll_task,
 972                                            HZ);
 973                 mutex_unlock(&pkey_mutex);
 974         }
 975 }
 976
 977 int ipoib_pkey_dev_delay_open(struct ipoib_dev_priv *priv)
 978 {
 979
 980         /* Look for the interface pkey value in the IB Port P_Key table and */
 981         /* set the interface pkey assigment flag                            */
 982         ipoib_pkey_dev_check_presence(priv);
 983
 984         /* P_Key value not assigned yet - start polling */
 985         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
 986                 mutex_lock(&pkey_mutex);
 987                 clear_bit(IPOIB_PKEY_STOP, &priv->flags);
 988                 queue_delayed_work(ipoib_workqueue,
 989                                    &priv->pkey_poll_task,
 990                                    HZ);
 991                 mutex_unlock(&pkey_mutex);
 992                 return 1;
 993         }
 994
 995         return 0;
 996 }