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_SIZE(m);
 121                 mb->m_pkthdr.len += m->m_len;
 122                 rx_req->mapping[i] = ib_dma_map_single(priv->ca,
 123                     mtod(m, void *), m->m_len, DMA_FROM_DEVICE);
 124                 if (unlikely(ib_dma_mapping_error(priv->ca,
 125                     rx_req->mapping[i])))
 126                         goto error;
 127
 128         }
 129         rx_req->mb = mb;
 130         return (mb);
 131 error:
 132         for (j = 0, m = mb; j < i; m = m->m_next, j++)
 133                 ib_dma_unmap_single(priv->ca, rx_req->mapping[j], m->m_len,
 134                     DMA_FROM_DEVICE);
 135         m_freem(mb);
 136         return (NULL);
 137
 138 }
 139
 140 static int ipoib_ib_post_receive(struct ipoib_dev_priv *priv, int id)
 141 {
 142         struct ipoib_rx_buf *rx_req;
 143         struct ib_recv_wr *bad_wr;
 144         struct mbuf *m;
 145         int ret;
 146         int i;
 147
 148         rx_req = &priv->rx_ring[id];
 149         for (m = rx_req->mb, i = 0; m != NULL; m = m->m_next, i++) {
 150                 priv->rx_sge[i].addr = rx_req->mapping[i];
 151                 priv->rx_sge[i].length = m->m_len;
 152         }
 153         priv->rx_wr.num_sge = i;
 154         priv->rx_wr.wr_id = id | IPOIB_OP_RECV;
 155
 156         ret = ib_post_recv(priv->qp, &priv->rx_wr, &bad_wr);
 157         if (unlikely(ret)) {
 158                 ipoib_warn(priv, "receive failed for buf %d (%d)\n", id, ret);
 159                 ipoib_dma_unmap_rx(priv, &priv->rx_ring[id]);
 160                 m_freem(priv->rx_ring[id].mb);
 161                 priv->rx_ring[id].mb = NULL;
 162         }
 163
 164         return ret;
 165 }
 166
 167 static struct mbuf *
 168 ipoib_alloc_rx_mb(struct ipoib_dev_priv *priv, int id)
 169 {
 170
 171         return ipoib_alloc_map_mb(priv, &priv->rx_ring[id],
 172             priv->max_ib_mtu + IB_GRH_BYTES);
 173 }
 174
 175 static int ipoib_ib_post_receives(struct ipoib_dev_priv *priv)
 176 {
 177         int i;
 178
 179         for (i = 0; i < ipoib_recvq_size; ++i) {
 180                 if (!ipoib_alloc_rx_mb(priv, i)) {
 181                         ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
 182                         return -ENOMEM;
 183                 }
 184                 if (ipoib_ib_post_receive(priv, i)) {
 185                         ipoib_warn(priv, "ipoib_ib_post_receive failed for buf %d\n", i);
 186                         return -EIO;
 187                 }
 188         }
 189
 190         return 0;
 191 }
 192
 193 static void
 194 ipoib_ib_handle_rx_wc(struct ipoib_dev_priv *priv, struct ib_wc *wc)
 195 {
 196         struct ipoib_rx_buf saverx;
 197         unsigned int wr_id = wc->wr_id & ~IPOIB_OP_RECV;
 198         struct ifnet *dev = priv->dev;
 199         struct ipoib_header *eh;
 200         struct mbuf *mb;
 201
 202         ipoib_dbg_data(priv, "recv completion: id %d, status: %d\n",
 203                        wr_id, wc->status);
 204
 205         if (unlikely(wr_id >= ipoib_recvq_size)) {
 206                 ipoib_warn(priv, "recv completion event with wrid %d (> %d)\n",
 207                            wr_id, ipoib_recvq_size);
 208                 return;
 209         }
 210
 211         mb  = priv->rx_ring[wr_id].mb;
 212
 213         if (unlikely(wc->status != IB_WC_SUCCESS)) {
 214                 if (wc->status != IB_WC_WR_FLUSH_ERR) {
 215                         ipoib_warn(priv, "failed recv event "
 216                                    "(status=%d, wrid=%d vend_err %x)\n",
 217                                    wc->status, wr_id, wc->vendor_err);
 218                         goto repost;
 219                 }
 220                 if (mb) {
 221                         ipoib_dma_unmap_rx(priv, &priv->rx_ring[wr_id]);
 222                         m_freem(mb);
 223                         priv->rx_ring[wr_id].mb = NULL;
 224                 }
 225                 return;
 226         }
 227
 228         /*
 229          * Drop packets that this interface sent, ie multicast packets
 230          * that the HCA has replicated.
 231          */
 232         if (wc->slid == priv->local_lid && wc->src_qp == priv->qp->qp_num)
 233                 goto repost;
 234
 235         memcpy(&saverx, &priv->rx_ring[wr_id], sizeof(saverx));
 236         /*
 237          * If we can't allocate a new RX buffer, dump
 238          * this packet and reuse the old buffer.
 239          */
 240         if (unlikely(!ipoib_alloc_rx_mb(priv, wr_id))) {
 241                 memcpy(&priv->rx_ring[wr_id], &saverx, sizeof(saverx));
 242                 if_inc_counter(dev, IFCOUNTER_IQDROPS, 1);
 243                 goto repost;
 244         }
 245
 246         ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
 247                        wc->byte_len, wc->slid);
 248
 249         ipoib_dma_unmap_rx(priv, &saverx);
 250         ipoib_dma_mb(priv, mb, wc->byte_len);
 251
 252         if_inc_counter(dev, IFCOUNTER_IPACKETS, 1);
 253         if_inc_counter(dev, IFCOUNTER_IBYTES, mb->m_pkthdr.len);
 254         mb->m_pkthdr.rcvif = dev;
 255         m_adj(mb, sizeof(struct ib_grh) - INFINIBAND_ALEN);
 256         eh = mtod(mb, struct ipoib_header *);
 257         bzero(eh->hwaddr, 4);   /* Zero the queue pair, only dgid is in grh */
 258
 259         if (test_bit(IPOIB_FLAG_CSUM, &priv->flags) && likely(wc->csum_ok))
 260                 mb->m_pkthdr.csum_flags = CSUM_IP_CHECKED | CSUM_IP_VALID;
 261
 262         dev->if_input(dev, mb);
 263
 264 repost:
 265         if (unlikely(ipoib_ib_post_receive(priv, wr_id)))
 266                 ipoib_warn(priv, "ipoib_ib_post_receive failed "
 267                            "for buf %d\n", wr_id);
 268 }
 269
 270 int ipoib_dma_map_tx(struct ib_device *ca, struct ipoib_tx_buf *tx_req, int max)
 271 {
 272         struct mbuf *mb = tx_req->mb;
 273         u64 *mapping = tx_req->mapping;
 274         struct mbuf *m, *p;
 275         int error;
 276         int i;
 277
 278         for (m = mb, p = NULL, i = 0; m != NULL; p = m, m = m->m_next, i++) {
 279                 if (m->m_len != 0)
 280                         continue;
 281                 if (p == NULL)
 282                         panic("ipoib_dma_map_tx: First mbuf empty\n");
 283                 p->m_next = m_free(m);
 284                 m = p;
 285                 i--;
 286         }
 287         i--;
 288         if (i >= max) {
 289                 tx_req->mb = mb = m_defrag(mb, M_NOWAIT);
 290                 if (mb == NULL)
 291                         return -EIO;
 292                 for (m = mb, i = 0; m != NULL; m = m->m_next, i++);
 293                 if (i >= max)
 294                         return -EIO;
 295         }
 296         error = 0;
 297         for (m = mb, i = 0; m != NULL; m = m->m_next, i++) {
 298                 mapping[i] = ib_dma_map_single(ca, mtod(m, void *),
 299                                                m->m_len, DMA_TO_DEVICE);
 300                 if (unlikely(ib_dma_mapping_error(ca, mapping[i]))) {
 301                         error = -EIO;
 302                         break;
 303                 }
 304         }
 305         if (error) {
 306                 int end;
 307
 308                 end = i;
 309                 for (m = mb, i = 0; i < end; m = m->m_next, i++)
 310                         ib_dma_unmap_single(ca, mapping[i], m->m_len,
 311                                             DMA_TO_DEVICE);
 312         }
 313         return error;
 314 }
 315
 316 void ipoib_dma_unmap_tx(struct ib_device *ca, struct ipoib_tx_buf *tx_req)
 317 {
 318         struct mbuf *mb = tx_req->mb;
 319         u64 *mapping = tx_req->mapping;
 320         struct mbuf *m;
 321         int i;
 322
 323         for (m = mb, i = 0; m != NULL; m = m->m_next, i++)
 324                 ib_dma_unmap_single(ca, mapping[i], m->m_len, DMA_TO_DEVICE);
 325 }
 326
 327 static void ipoib_ib_handle_tx_wc(struct ipoib_dev_priv *priv, struct ib_wc *wc)
 328 {
 329         struct ifnet *dev = priv->dev;
 330         unsigned int wr_id = wc->wr_id;
 331         struct ipoib_tx_buf *tx_req;
 332
 333         ipoib_dbg_data(priv, "send completion: id %d, status: %d\n",
 334                        wr_id, wc->status);
 335
 336         if (unlikely(wr_id >= ipoib_sendq_size)) {
 337                 ipoib_warn(priv, "send completion event with wrid %d (> %d)\n",
 338                            wr_id, ipoib_sendq_size);
 339                 return;
 340         }
 341
 342         tx_req = &priv->tx_ring[wr_id];
 343
 344         ipoib_dma_unmap_tx(priv->ca, tx_req);
 345
 346         if_inc_counter(dev, IFCOUNTER_OPACKETS, 1);
 347
 348         m_freem(tx_req->mb);
 349
 350         ++priv->tx_tail;
 351         if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
 352             (dev->if_drv_flags & IFF_DRV_OACTIVE) &&
 353             test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
 354                 dev->if_drv_flags &= ~IFF_DRV_OACTIVE;
 355
 356         if (wc->status != IB_WC_SUCCESS &&
 357             wc->status != IB_WC_WR_FLUSH_ERR)
 358                 ipoib_warn(priv, "failed send event "
 359                            "(status=%d, wrid=%d vend_err %x)\n",
 360                            wc->status, wr_id, wc->vendor_err);
 361 }
 362
 363 int
 364 ipoib_poll_tx(struct ipoib_dev_priv *priv)
 365 {
 366         int n, i;
 367
 368         n = ib_poll_cq(priv->send_cq, MAX_SEND_CQE, priv->send_wc);
 369         for (i = 0; i < n; ++i) {
 370                 struct ib_wc *wc = priv->send_wc + i;
 371                 if (wc->wr_id & IPOIB_OP_CM)
 372                         ipoib_cm_handle_tx_wc(priv, wc);
 373                 else
 374                         ipoib_ib_handle_tx_wc(priv, wc);
 375         }
 376
 377         return n == MAX_SEND_CQE;
 378 }
 379
 380 static void
 381 ipoib_poll(struct ipoib_dev_priv *priv)
 382 {
 383         int n, i;
 384
 385 poll_more:
 386         spin_lock(&priv->drain_lock);
 387         for (;;) {
 388                 n = ib_poll_cq(priv->recv_cq, IPOIB_NUM_WC, priv->ibwc);
 389                 for (i = 0; i < n; i++) {
 390                         struct ib_wc *wc = priv->ibwc + i;
 391
 392                         if ((wc->wr_id & IPOIB_OP_RECV) == 0)
 393                                 panic("ipoib_poll: Bad wr_id 0x%jX\n",
 394                                     (intmax_t)wc->wr_id);
 395                         if (wc->wr_id & IPOIB_OP_CM)
 396                                 ipoib_cm_handle_rx_wc(priv, wc);
 397                         else
 398                                 ipoib_ib_handle_rx_wc(priv, wc);
 399                 }
 400
 401                 if (n != IPOIB_NUM_WC)
 402                         break;
 403         }
 404         spin_unlock(&priv->drain_lock);
 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                         if_inc_counter(dev, IFCOUNTER_OERRORS, 1);
 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                         if_inc_counter(dev, IFCOUNTER_OERRORS, 1);
 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                 if_inc_counter(dev, IFCOUNTER_OERRORS, 1);
 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                 if_inc_counter(dev, IFCOUNTER_OERRORS, 1);
 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         set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
 642
 643         return 0;
 644 }
 645
 646 static void ipoib_pkey_dev_check_presence(struct ipoib_dev_priv *priv)
 647 {
 648         u16 pkey_index = 0;
 649
 650         if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &pkey_index))
 651                 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 652         else
 653                 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 654 }
 655
 656 int ipoib_ib_dev_up(struct ipoib_dev_priv *priv)
 657 {
 658
 659         ipoib_pkey_dev_check_presence(priv);
 660
 661         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
 662                 ipoib_dbg(priv, "PKEY is not assigned.\n");
 663                 return 0;
 664         }
 665
 666         set_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
 667
 668         return ipoib_mcast_start_thread(priv);
 669 }
 670
 671 int ipoib_ib_dev_down(struct ipoib_dev_priv *priv, int flush)
 672 {
 673
 674         ipoib_dbg(priv, "downing ib_dev\n");
 675
 676         clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
 677         if_link_state_change(priv->dev, LINK_STATE_DOWN);
 678
 679         /* Shutdown the P_Key thread if still active */
 680         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
 681                 mutex_lock(&pkey_mutex);
 682                 set_bit(IPOIB_PKEY_STOP, &priv->flags);
 683                 cancel_delayed_work(&priv->pkey_poll_task);
 684                 mutex_unlock(&pkey_mutex);
 685                 if (flush)
 686                         flush_workqueue(ipoib_workqueue);
 687         }
 688
 689         ipoib_mcast_stop_thread(priv, flush);
 690         ipoib_mcast_dev_flush(priv);
 691
 692         ipoib_flush_paths(priv);
 693
 694         return 0;
 695 }
 696
 697 static int recvs_pending(struct ipoib_dev_priv *priv)
 698 {
 699         int pending = 0;
 700         int i;
 701
 702         for (i = 0; i < ipoib_recvq_size; ++i)
 703                 if (priv->rx_ring[i].mb)
 704                         ++pending;
 705
 706         return pending;
 707 }
 708
 709 void ipoib_drain_cq(struct ipoib_dev_priv *priv)
 710 {
 711         int i, n;
 712
 713         spin_lock(&priv->drain_lock);
 714         do {
 715                 n = ib_poll_cq(priv->recv_cq, IPOIB_NUM_WC, priv->ibwc);
 716                 for (i = 0; i < n; ++i) {
 717                         /*
 718                          * Convert any successful completions to flush
 719                          * errors to avoid passing packets up the
 720                          * stack after bringing the device down.
 721                          */
 722                         if (priv->ibwc[i].status == IB_WC_SUCCESS)
 723                                 priv->ibwc[i].status = IB_WC_WR_FLUSH_ERR;
 724
 725                         if ((priv->ibwc[i].wr_id & IPOIB_OP_RECV) == 0)
 726                                 panic("ipoib_drain_cq:  Bad wrid 0x%jX\n",
 727                                     (intmax_t)priv->ibwc[i].wr_id);
 728                         if (priv->ibwc[i].wr_id & IPOIB_OP_CM)
 729                                 ipoib_cm_handle_rx_wc(priv, priv->ibwc + i);
 730                         else
 731                                 ipoib_ib_handle_rx_wc(priv, priv->ibwc + i);
 732                 }
 733         } while (n == IPOIB_NUM_WC);
 734         spin_unlock(&priv->drain_lock);
 735
 736         spin_lock(&priv->lock);
 737         while (ipoib_poll_tx(priv))
 738                 ; /* nothing */
 739
 740         spin_unlock(&priv->lock);
 741 }
 742
 743 int ipoib_ib_dev_stop(struct ipoib_dev_priv *priv, int flush)
 744 {
 745         struct ib_qp_attr qp_attr;
 746         unsigned long begin;
 747         struct ipoib_tx_buf *tx_req;
 748         int i;
 749
 750         clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
 751
 752         ipoib_cm_dev_stop(priv);
 753
 754         /*
 755          * Move our QP to the error state and then reinitialize in
 756          * when all work requests have completed or have been flushed.
 757          */
 758         qp_attr.qp_state = IB_QPS_ERR;
 759         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
 760                 ipoib_warn(priv, "Failed to modify QP to ERROR state\n");
 761
 762         /* Wait for all sends and receives to complete */
 763         begin = jiffies;
 764
 765         while (priv->tx_head != priv->tx_tail || recvs_pending(priv)) {
 766                 if (time_after(jiffies, begin + 5 * HZ)) {
 767                         ipoib_warn(priv, "timing out; %d sends %d receives not completed\n",
 768                                    priv->tx_head - priv->tx_tail, recvs_pending(priv));
 769
 770                         /*
 771                          * assume the HW is wedged and just free up
 772                          * all our pending work requests.
 773                          */
 774                         while ((int) priv->tx_tail - (int) priv->tx_head < 0) {
 775                                 tx_req = &priv->tx_ring[priv->tx_tail &
 776                                                         (ipoib_sendq_size - 1)];
 777                                 ipoib_dma_unmap_tx(priv->ca, tx_req);
 778                                 m_freem(tx_req->mb);
 779                                 ++priv->tx_tail;
 780                                 --priv->tx_outstanding;
 781                         }
 782
 783                         for (i = 0; i < ipoib_recvq_size; ++i) {
 784                                 struct ipoib_rx_buf *rx_req;
 785
 786                                 rx_req = &priv->rx_ring[i];
 787                                 if (!rx_req->mb)
 788                                         continue;
 789                                 ipoib_dma_unmap_rx(priv, &priv->rx_ring[i]);
 790                                 m_freem(rx_req->mb);
 791                                 rx_req->mb = NULL;
 792                         }
 793
 794                         goto timeout;
 795                 }
 796
 797                 ipoib_drain_cq(priv);
 798
 799                 msleep(1);
 800         }
 801
 802         ipoib_dbg(priv, "All sends and receives done.\n");
 803
 804 timeout:
 805         del_timer_sync(&priv->poll_timer);
 806         qp_attr.qp_state = IB_QPS_RESET;
 807         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
 808                 ipoib_warn(priv, "Failed to modify QP to RESET state\n");
 809
 810         /* Wait for all AHs to be reaped */
 811         set_bit(IPOIB_STOP_REAPER, &priv->flags);
 812         cancel_delayed_work(&priv->ah_reap_task);
 813         if (flush)
 814                 flush_workqueue(ipoib_workqueue);
 815
 816         ipoib_ah_dev_cleanup(priv);
 817
 818         ib_req_notify_cq(priv->recv_cq, IB_CQ_NEXT_COMP);
 819
 820         return 0;
 821 }
 822
 823 int ipoib_ib_dev_init(struct ipoib_dev_priv *priv, struct ib_device *ca, int port)
 824 {
 825         struct ifnet *dev = priv->dev;
 826
 827         priv->ca = ca;
 828         priv->port = port;
 829         priv->qp = NULL;
 830
 831         if (ipoib_transport_dev_init(priv, ca)) {
 832                 printk(KERN_WARNING "%s: ipoib_transport_dev_init failed\n", ca->name);
 833                 return -ENODEV;
 834         }
 835
 836         setup_timer(&priv->poll_timer, ipoib_ib_tx_timer_func,
 837                     (unsigned long) priv);
 838
 839         if (dev->if_flags & IFF_UP) {
 840                 if (ipoib_ib_dev_open(priv)) {
 841                         ipoib_transport_dev_cleanup(priv);
 842                         return -ENODEV;
 843                 }
 844         }
 845
 846         return 0;
 847 }
 848
 849 static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv,
 850                                 enum ipoib_flush_level level)
 851 {
 852         struct ipoib_dev_priv *cpriv;
 853         u16 new_index;
 854
 855         mutex_lock(&priv->vlan_mutex);
 856
 857         /*
 858          * Flush any child interfaces too -- they might be up even if
 859          * the parent is down.
 860          */
 861         list_for_each_entry(cpriv, &priv->child_intfs, list)
 862                 __ipoib_ib_dev_flush(cpriv, level);
 863
 864         mutex_unlock(&priv->vlan_mutex);
 865
 866         if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) {
 867                 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n");
 868                 return;
 869         }
 870
 871         if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
 872                 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n");
 873                 return;
 874         }
 875
 876         if (level == IPOIB_FLUSH_HEAVY) {
 877                 if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &new_index)) {
 878                         clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 879                         ipoib_ib_dev_down(priv, 0);
 880                         ipoib_ib_dev_stop(priv, 0);
 881                         if (ipoib_pkey_dev_delay_open(priv))
 882                                 return;
 883                 }
 884
 885                 /* restart QP only if P_Key index is changed */
 886                 if (test_and_set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags) &&
 887                     new_index == priv->pkey_index) {
 888                         ipoib_dbg(priv, "Not flushing - P_Key index not changed.\n");
 889                         return;
 890                 }
 891                 priv->pkey_index = new_index;
 892         }
 893
 894         if (level == IPOIB_FLUSH_LIGHT) {
 895                 ipoib_mark_paths_invalid(priv);
 896                 ipoib_mcast_dev_flush(priv);
 897         }
 898
 899         if (level >= IPOIB_FLUSH_NORMAL)
 900                 ipoib_ib_dev_down(priv, 0);
 901
 902         if (level == IPOIB_FLUSH_HEAVY) {
 903                 ipoib_ib_dev_stop(priv, 0);
 904                 ipoib_ib_dev_open(priv);
 905         }
 906
 907         /*
 908          * The device could have been brought down between the start and when
 909          * we get here, don't bring it back up if it's not configured up
 910          */
 911         if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
 912                 if (level >= IPOIB_FLUSH_NORMAL)
 913                         ipoib_ib_dev_up(priv);
 914                 ipoib_mcast_restart_task(&priv->restart_task);
 915         }
 916 }
 917
 918 void ipoib_ib_dev_flush_light(struct work_struct *work)
 919 {
 920         struct ipoib_dev_priv *priv =
 921                 container_of(work, struct ipoib_dev_priv, flush_light);
 922
 923         __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_LIGHT);
 924 }
 925
 926 void ipoib_ib_dev_flush_normal(struct work_struct *work)
 927 {
 928         struct ipoib_dev_priv *priv =
 929                 container_of(work, struct ipoib_dev_priv, flush_normal);
 930
 931         __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_NORMAL);
 932 }
 933
 934 void ipoib_ib_dev_flush_heavy(struct work_struct *work)
 935 {
 936         struct ipoib_dev_priv *priv =
 937                 container_of(work, struct ipoib_dev_priv, flush_heavy);
 938
 939         __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_HEAVY);
 940 }
 941
 942 void ipoib_ib_dev_cleanup(struct ipoib_dev_priv *priv)
 943 {
 944
 945         ipoib_dbg(priv, "cleaning up ib_dev\n");
 946
 947         ipoib_mcast_stop_thread(priv, 1);
 948         ipoib_mcast_dev_flush(priv);
 949
 950         ipoib_ah_dev_cleanup(priv);
 951         ipoib_transport_dev_cleanup(priv);
 952 }
 953
 954 /*
 955  * Delayed P_Key Assigment Interim Support
 956  *
 957  * The following is initial implementation of delayed P_Key assigment
 958  * mechanism. It is using the same approach implemented for the multicast
 959  * group join. The single goal of this implementation is to quickly address
 960  * Bug #2507. This implementation will probably be removed when the P_Key
 961  * change async notification is available.
 962  */
 963
 964 void ipoib_pkey_poll(struct work_struct *work)
 965 {
 966         struct ipoib_dev_priv *priv =
 967                 container_of(work, struct ipoib_dev_priv, pkey_poll_task.work);
 968
 969         ipoib_pkey_dev_check_presence(priv);
 970
 971         if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags))
 972                 ipoib_open(priv);
 973         else {
 974                 mutex_lock(&pkey_mutex);
 975                 if (!test_bit(IPOIB_PKEY_STOP, &priv->flags))
 976                         queue_delayed_work(ipoib_workqueue,
 977                                            &priv->pkey_poll_task,
 978                                            HZ);
 979                 mutex_unlock(&pkey_mutex);
 980         }
 981 }
 982
 983 int ipoib_pkey_dev_delay_open(struct ipoib_dev_priv *priv)
 984 {
 985
 986         /* Look for the interface pkey value in the IB Port P_Key table and */
 987         /* set the interface pkey assigment flag                            */
 988         ipoib_pkey_dev_check_presence(priv);
 989
 990         /* P_Key value not assigned yet - start polling */
 991         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
 992                 mutex_lock(&pkey_mutex);
 993                 clear_bit(IPOIB_PKEY_STOP, &priv->flags);
 994                 queue_delayed_work(ipoib_workqueue,
 995                                    &priv->pkey_poll_task,
 996                                    HZ);
 997                 mutex_unlock(&pkey_mutex);
 998                 return 1;
 999         }
1000
1001         return 0;
1002 }