sys/ofed/drivers/infiniband/ulp/ipoib/ipoib_ib.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause OR GPL-2.0
   3  *
   4  * Copyright (c) 2004, 2005 Topspin Communications.  All rights reserved.
   5  * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
   6  * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
   7  * Copyright (c) 2004, 2005 Voltaire, Inc. All rights reserved.
   8  *
   9  * This software is available to you under a choice of one of two
  10  * licenses.  You may choose to be licensed under the terms of the GNU
  11  * General Public License (GPL) Version 2, available from the file
  12  * COPYING in the main directory of this source tree, or the
  13  * OpenIB.org BSD license below:
  14  *
  15  *     Redistribution and use in source and binary forms, with or
  16  *     without modification, are permitted provided that the following
  17  *     conditions are met:
  18  *
  19  *      - Redistributions of source code must retain the above
  20  *        copyright notice, this list of conditions and the following
  21  *        disclaimer.
  22  *
  23  *      - Redistributions in binary form must reproduce the above
  24  *        copyright notice, this list of conditions and the following
  25  *        disclaimer in the documentation and/or other materials
  26  *        provided with the distribution.
  27  *
  28  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  29  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  30  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  31  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  32  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  33  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  34  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  35  * SOFTWARE.
  36  */
  37
  38 #include <sys/cdefs.h>
  39 __FBSDID("$FreeBSD$");
  40
  41 #include "ipoib.h"
  42
  43 #include <rdma/ib_cache.h>
  44
  45 #include <security/mac/mac_framework.h>
  46
  47 #include <linux/delay.h>
  48 #include <linux/dma-mapping.h>
  49
  50 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA
  51 static int data_debug_level;
  52
  53 module_param(data_debug_level, int, 0644);
  54 MODULE_PARM_DESC(data_debug_level,
  55                  "Enable data path debug tracing if > 0");
  56 #endif
  57
  58 static DEFINE_MUTEX(pkey_mutex);
  59
  60 struct ipoib_ah *ipoib_create_ah(struct ipoib_dev_priv *priv,
  61                                  struct ib_pd *pd, struct ib_ah_attr *attr)
  62 {
  63         struct ipoib_ah *ah;
  64
  65         ah = kmalloc(sizeof *ah, GFP_KERNEL);
  66         if (!ah)
  67                 return NULL;
  68
  69         ah->priv      = priv;
  70         ah->last_send = 0;
  71         kref_init(&ah->ref);
  72
  73         ah->ah = ib_create_ah(pd, attr);
  74         if (IS_ERR(ah->ah)) {
  75                 kfree(ah);
  76                 ah = NULL;
  77         } else
  78                 ipoib_dbg(priv, "Created ah %p\n", ah->ah);
  79
  80         return ah;
  81 }
  82
  83 void ipoib_free_ah(struct kref *kref)
  84 {
  85         struct ipoib_ah *ah = container_of(kref, struct ipoib_ah, ref);
  86         struct ipoib_dev_priv *priv = ah->priv;
  87
  88         unsigned long flags;
  89
  90         spin_lock_irqsave(&priv->lock, flags);
  91         list_add_tail(&ah->list, &priv->dead_ahs);
  92         spin_unlock_irqrestore(&priv->lock, flags);
  93 }
  94
  95 void
  96 ipoib_dma_unmap_rx(struct ipoib_dev_priv *priv, struct ipoib_rx_buf *rx_req)
  97 {
  98         struct mbuf *m;
  99         int i;
 100
 101         for (i = 0, m = rx_req->mb; m != NULL; m = m->m_next, i++)
 102                 ib_dma_unmap_single(priv->ca, rx_req->mapping[i], m->m_len,
 103                     DMA_FROM_DEVICE);
 104 }
 105
 106 void
 107 ipoib_dma_mb(struct ipoib_dev_priv *priv, struct mbuf *mb, unsigned int length)
 108 {
 109
 110         m_adj(mb, -(mb->m_pkthdr.len - length));
 111 }
 112
 113 struct mbuf *
 114 ipoib_alloc_map_mb(struct ipoib_dev_priv *priv, struct ipoib_rx_buf *rx_req,
 115     int size)
 116 {
 117         struct mbuf *mb, *m;
 118         int i, j;
 119
 120         rx_req->mb = NULL;
 121         mb = m_getm2(NULL, size, M_NOWAIT, MT_DATA, M_PKTHDR);
 122         if (mb == NULL)
 123                 return (NULL);
 124         for (i = 0, m = mb; m != NULL; m = m->m_next, i++) {
 125                 m->m_len = M_SIZE(m);
 126                 mb->m_pkthdr.len += m->m_len;
 127                 rx_req->mapping[i] = ib_dma_map_single(priv->ca,
 128                     mtod(m, void *), m->m_len, DMA_FROM_DEVICE);
 129                 if (unlikely(ib_dma_mapping_error(priv->ca,
 130                     rx_req->mapping[i])))
 131                         goto error;
 132
 133         }
 134         rx_req->mb = mb;
 135         return (mb);
 136 error:
 137         for (j = 0, m = mb; j < i; m = m->m_next, j++)
 138                 ib_dma_unmap_single(priv->ca, rx_req->mapping[j], m->m_len,
 139                     DMA_FROM_DEVICE);
 140         m_freem(mb);
 141         return (NULL);
 142
 143 }
 144
 145 static int ipoib_ib_post_receive(struct ipoib_dev_priv *priv, int id)
 146 {
 147         struct ipoib_rx_buf *rx_req;
 148         struct ib_recv_wr *bad_wr;
 149         struct mbuf *m;
 150         int ret;
 151         int i;
 152
 153         rx_req = &priv->rx_ring[id];
 154         for (m = rx_req->mb, i = 0; m != NULL; m = m->m_next, i++) {
 155                 priv->rx_sge[i].addr = rx_req->mapping[i];
 156                 priv->rx_sge[i].length = m->m_len;
 157         }
 158         priv->rx_wr.num_sge = i;
 159         priv->rx_wr.wr_id = id | IPOIB_OP_RECV;
 160
 161         ret = ib_post_recv(priv->qp, &priv->rx_wr, &bad_wr);
 162         if (unlikely(ret)) {
 163                 ipoib_warn(priv, "receive failed for buf %d (%d)\n", id, ret);
 164                 ipoib_dma_unmap_rx(priv, &priv->rx_ring[id]);
 165                 m_freem(priv->rx_ring[id].mb);
 166                 priv->rx_ring[id].mb = NULL;
 167         }
 168
 169         return ret;
 170 }
 171
 172 static struct mbuf *
 173 ipoib_alloc_rx_mb(struct ipoib_dev_priv *priv, int id)
 174 {
 175
 176         return ipoib_alloc_map_mb(priv, &priv->rx_ring[id],
 177             priv->max_ib_mtu + IB_GRH_BYTES);
 178 }
 179
 180 static int ipoib_ib_post_receives(struct ipoib_dev_priv *priv)
 181 {
 182         int i;
 183
 184         for (i = 0; i < ipoib_recvq_size; ++i) {
 185                 if (!ipoib_alloc_rx_mb(priv, i)) {
 186                         ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
 187                         return -ENOMEM;
 188                 }
 189                 if (ipoib_ib_post_receive(priv, i)) {
 190                         ipoib_warn(priv, "ipoib_ib_post_receive failed for buf %d\n", i);
 191                         return -EIO;
 192                 }
 193         }
 194
 195         return 0;
 196 }
 197
 198 static void
 199 ipoib_ib_handle_rx_wc(struct ipoib_dev_priv *priv, struct ib_wc *wc)
 200 {
 201         struct ipoib_rx_buf saverx;
 202         unsigned int wr_id = wc->wr_id & ~IPOIB_OP_RECV;
 203         struct ifnet *dev = priv->dev;
 204         struct ipoib_header *eh;
 205         struct mbuf *mb;
 206
 207         ipoib_dbg_data(priv, "recv completion: id %d, status: %d\n",
 208                        wr_id, wc->status);
 209
 210         if (unlikely(wr_id >= ipoib_recvq_size)) {
 211                 ipoib_warn(priv, "recv completion event with wrid %d (> %d)\n",
 212                            wr_id, ipoib_recvq_size);
 213                 return;
 214         }
 215
 216         mb  = priv->rx_ring[wr_id].mb;
 217
 218         if (unlikely(wc->status != IB_WC_SUCCESS)) {
 219                 if (wc->status != IB_WC_WR_FLUSH_ERR) {
 220                         ipoib_warn(priv, "failed recv event "
 221                                    "(status=%d, wrid=%d vend_err %x)\n",
 222                                    wc->status, wr_id, wc->vendor_err);
 223                         goto repost;
 224                 }
 225                 if (mb) {
 226                         ipoib_dma_unmap_rx(priv, &priv->rx_ring[wr_id]);
 227                         m_freem(mb);
 228                         priv->rx_ring[wr_id].mb = NULL;
 229                 }
 230                 return;
 231         }
 232
 233         /*
 234          * Drop packets that this interface sent, ie multicast packets
 235          * that the HCA has replicated.
 236          */
 237         if (wc->slid == priv->local_lid && wc->src_qp == priv->qp->qp_num)
 238                 goto repost;
 239
 240         memcpy(&saverx, &priv->rx_ring[wr_id], sizeof(saverx));
 241         /*
 242          * If we can't allocate a new RX buffer, dump
 243          * this packet and reuse the old buffer.
 244          */
 245         if (unlikely(!ipoib_alloc_rx_mb(priv, wr_id))) {
 246                 memcpy(&priv->rx_ring[wr_id], &saverx, sizeof(saverx));
 247                 if_inc_counter(dev, IFCOUNTER_IQDROPS, 1);
 248                 goto repost;
 249         }
 250
 251         ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
 252                        wc->byte_len, wc->slid);
 253
 254         ipoib_dma_unmap_rx(priv, &saverx);
 255         ipoib_dma_mb(priv, mb, wc->byte_len);
 256
 257         if_inc_counter(dev, IFCOUNTER_IPACKETS, 1);
 258         if_inc_counter(dev, IFCOUNTER_IBYTES, mb->m_pkthdr.len);
 259         mb->m_pkthdr.rcvif = dev;
 260         m_adj(mb, sizeof(struct ib_grh) - INFINIBAND_ALEN);
 261         eh = mtod(mb, struct ipoib_header *);
 262         bzero(eh->hwaddr, 4);   /* Zero the queue pair, only dgid is in grh */
 263
 264         if (test_bit(IPOIB_FLAG_CSUM, &priv->flags) && likely(wc->wc_flags & IB_WC_IP_CSUM_OK))
 265                 mb->m_pkthdr.csum_flags = CSUM_IP_CHECKED | CSUM_IP_VALID;
 266
 267         dev->if_input(dev, mb);
 268
 269 repost:
 270         if (unlikely(ipoib_ib_post_receive(priv, wr_id)))
 271                 ipoib_warn(priv, "ipoib_ib_post_receive failed "
 272                            "for buf %d\n", wr_id);
 273 }
 274
 275 int ipoib_dma_map_tx(struct ib_device *ca, struct ipoib_tx_buf *tx_req, int max)
 276 {
 277         struct mbuf *mb = tx_req->mb;
 278         u64 *mapping = tx_req->mapping;
 279         struct mbuf *m, *p;
 280         int error;
 281         int i;
 282
 283         for (m = mb, p = NULL, i = 0; m != NULL; p = m, m = m->m_next, i++) {
 284                 if (m->m_len != 0)
 285                         continue;
 286                 if (p == NULL)
 287                         panic("ipoib_dma_map_tx: First mbuf empty\n");
 288                 p->m_next = m_free(m);
 289                 m = p;
 290                 i--;
 291         }
 292         i--;
 293         if (i >= max) {
 294                 tx_req->mb = mb = m_defrag(mb, M_NOWAIT);
 295                 if (mb == NULL)
 296                         return -EIO;
 297                 for (m = mb, i = 0; m != NULL; m = m->m_next, i++);
 298                 if (i >= max)
 299                         return -EIO;
 300         }
 301         error = 0;
 302         for (m = mb, i = 0; m != NULL; m = m->m_next, i++) {
 303                 mapping[i] = ib_dma_map_single(ca, mtod(m, void *),
 304                                                m->m_len, DMA_TO_DEVICE);
 305                 if (unlikely(ib_dma_mapping_error(ca, mapping[i]))) {
 306                         error = -EIO;
 307                         break;
 308                 }
 309         }
 310         if (error) {
 311                 int end;
 312
 313                 end = i;
 314                 for (m = mb, i = 0; i < end; m = m->m_next, i++)
 315                         ib_dma_unmap_single(ca, mapping[i], m->m_len,
 316                                             DMA_TO_DEVICE);
 317         }
 318         return error;
 319 }
 320
 321 void ipoib_dma_unmap_tx(struct ib_device *ca, struct ipoib_tx_buf *tx_req)
 322 {
 323         struct mbuf *mb = tx_req->mb;
 324         u64 *mapping = tx_req->mapping;
 325         struct mbuf *m;
 326         int i;
 327
 328         for (m = mb, i = 0; m != NULL; m = m->m_next, i++)
 329                 ib_dma_unmap_single(ca, mapping[i], m->m_len, DMA_TO_DEVICE);
 330 }
 331
 332 static void ipoib_ib_handle_tx_wc(struct ipoib_dev_priv *priv, struct ib_wc *wc)
 333 {
 334         struct ifnet *dev = priv->dev;
 335         unsigned int wr_id = wc->wr_id;
 336         struct ipoib_tx_buf *tx_req;
 337
 338         ipoib_dbg_data(priv, "send completion: id %d, status: %d\n",
 339                        wr_id, wc->status);
 340
 341         if (unlikely(wr_id >= ipoib_sendq_size)) {
 342                 ipoib_warn(priv, "send completion event with wrid %d (> %d)\n",
 343                            wr_id, ipoib_sendq_size);
 344                 return;
 345         }
 346
 347         tx_req = &priv->tx_ring[wr_id];
 348
 349         ipoib_dma_unmap_tx(priv->ca, tx_req);
 350
 351         if_inc_counter(dev, IFCOUNTER_OPACKETS, 1);
 352
 353         m_freem(tx_req->mb);
 354
 355         ++priv->tx_tail;
 356         if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
 357             (dev->if_drv_flags & IFF_DRV_OACTIVE) &&
 358             test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
 359                 dev->if_drv_flags &= ~IFF_DRV_OACTIVE;
 360
 361         if (wc->status != IB_WC_SUCCESS &&
 362             wc->status != IB_WC_WR_FLUSH_ERR)
 363                 ipoib_warn(priv, "failed send event "
 364                            "(status=%d, wrid=%d vend_err %x)\n",
 365                            wc->status, wr_id, wc->vendor_err);
 366 }
 367
 368 int
 369 ipoib_poll_tx(struct ipoib_dev_priv *priv, bool do_start)
 370 {
 371         int n, i;
 372
 373         n = ib_poll_cq(priv->send_cq, MAX_SEND_CQE, priv->send_wc);
 374         for (i = 0; i < n; ++i) {
 375                 struct ib_wc *wc = priv->send_wc + i;
 376                 if (wc->wr_id & IPOIB_OP_CM)
 377                         ipoib_cm_handle_tx_wc(priv, wc);
 378                 else
 379                         ipoib_ib_handle_tx_wc(priv, wc);
 380         }
 381
 382         if (do_start && n != 0)
 383                 ipoib_start_locked(priv->dev, priv);
 384
 385         return n == MAX_SEND_CQE;
 386 }
 387
 388 static void
 389 ipoib_poll(struct ipoib_dev_priv *priv)
 390 {
 391         int n, i;
 392
 393 poll_more:
 394         spin_lock(&priv->drain_lock);
 395         for (;;) {
 396                 n = ib_poll_cq(priv->recv_cq, IPOIB_NUM_WC, priv->ibwc);
 397                 for (i = 0; i < n; i++) {
 398                         struct ib_wc *wc = priv->ibwc + i;
 399
 400                         if ((wc->wr_id & IPOIB_OP_RECV) == 0)
 401                                 panic("ipoib_poll: Bad wr_id 0x%jX\n",
 402                                     (intmax_t)wc->wr_id);
 403                         if (wc->wr_id & IPOIB_OP_CM)
 404                                 ipoib_cm_handle_rx_wc(priv, wc);
 405                         else
 406                                 ipoib_ib_handle_rx_wc(priv, wc);
 407                 }
 408
 409                 if (n != IPOIB_NUM_WC)
 410                         break;
 411         }
 412         spin_unlock(&priv->drain_lock);
 413
 414         if (ib_req_notify_cq(priv->recv_cq,
 415             IB_CQ_NEXT_COMP | IB_CQ_REPORT_MISSED_EVENTS) > 0)
 416                 goto poll_more;
 417 }
 418
 419 void ipoib_ib_completion(struct ib_cq *cq, void *dev_ptr)
 420 {
 421         struct ipoib_dev_priv *priv = dev_ptr;
 422
 423         ipoib_poll(priv);
 424 }
 425
 426 static void drain_tx_cq(struct ipoib_dev_priv *priv)
 427 {
 428         struct ifnet *dev = priv->dev;
 429
 430         spin_lock(&priv->lock);
 431         while (ipoib_poll_tx(priv, true))
 432                 ; /* nothing */
 433
 434         if (dev->if_drv_flags & IFF_DRV_OACTIVE)
 435                 mod_timer(&priv->poll_timer, jiffies + 1);
 436
 437         spin_unlock(&priv->lock);
 438 }
 439
 440 void ipoib_send_comp_handler(struct ib_cq *cq, void *dev_ptr)
 441 {
 442         struct ipoib_dev_priv *priv = dev_ptr;
 443
 444         mod_timer(&priv->poll_timer, jiffies);
 445 }
 446
 447 static inline int
 448 post_send(struct ipoib_dev_priv *priv, unsigned int wr_id,
 449     struct ib_ah *address, u32 qpn, struct ipoib_tx_buf *tx_req, void *head,
 450     int hlen)
 451 {
 452         struct ib_send_wr *bad_wr;
 453         struct mbuf *mb = tx_req->mb;
 454         u64 *mapping = tx_req->mapping;
 455         struct mbuf *m;
 456         int i;
 457
 458         for (m = mb, i = 0; m != NULL; m = m->m_next, i++) {
 459                 priv->tx_sge[i].addr         = mapping[i];
 460                 priv->tx_sge[i].length       = m->m_len;
 461         }
 462         priv->tx_wr.wr.num_sge  = i;
 463         priv->tx_wr.wr.wr_id    = wr_id;
 464         priv->tx_wr.remote_qpn  = qpn;
 465         priv->tx_wr.ah          = address;
 466
 467         if (head) {
 468                 priv->tx_wr.mss         = 0; /* XXX mb_shinfo(mb)->gso_size; */
 469                 priv->tx_wr.header      = head;
 470                 priv->tx_wr.hlen        = hlen;
 471                 priv->tx_wr.wr.opcode   = IB_WR_LSO;
 472         } else
 473                 priv->tx_wr.wr.opcode   = IB_WR_SEND;
 474
 475         return ib_post_send(priv->qp, &priv->tx_wr.wr, &bad_wr);
 476 }
 477
 478 void
 479 ipoib_send(struct ipoib_dev_priv *priv, struct mbuf *mb,
 480     struct ipoib_ah *address, u32 qpn)
 481 {
 482         struct ifnet *dev = priv->dev;
 483         struct ipoib_tx_buf *tx_req;
 484         int hlen;
 485         void *phead;
 486
 487         if (unlikely(priv->tx_outstanding > MAX_SEND_CQE))
 488                 while (ipoib_poll_tx(priv, false))
 489                         ; /* nothing */
 490
 491         m_adj(mb, sizeof (struct ipoib_pseudoheader));
 492         if (0 /* XXX segment offload mb_is_gso(mb) */) {
 493                 /* XXX hlen = mb_transport_offset(mb) + tcp_hdrlen(mb); */
 494                 phead = mtod(mb, void *);
 495                 if (mb->m_len < hlen) {
 496                         ipoib_warn(priv, "linear data too small\n");
 497                         if_inc_counter(dev, IFCOUNTER_OERRORS, 1);
 498                         m_freem(mb);
 499                         return;
 500                 }
 501                 m_adj(mb, hlen);
 502         } else {
 503                 if (unlikely(mb->m_pkthdr.len - IPOIB_ENCAP_LEN > priv->mcast_mtu)) {
 504                         ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
 505                                    mb->m_pkthdr.len, priv->mcast_mtu);
 506                         if_inc_counter(dev, IFCOUNTER_OERRORS, 1);
 507                         ipoib_cm_mb_too_long(priv, mb, priv->mcast_mtu);
 508                         return;
 509                 }
 510                 phead = NULL;
 511                 hlen  = 0;
 512         }
 513
 514         ipoib_dbg_data(priv, "sending packet, length=%d address=%p qpn=0x%06x\n",
 515                        mb->m_pkthdr.len, address, qpn);
 516
 517         /*
 518          * We put the mb into the tx_ring _before_ we call post_send()
 519          * because it's entirely possible that the completion handler will
 520          * run before we execute anything after the post_send().  That
 521          * means we have to make sure everything is properly recorded and
 522          * our state is consistent before we call post_send().
 523          */
 524         tx_req = &priv->tx_ring[priv->tx_head & (ipoib_sendq_size - 1)];
 525         tx_req->mb = mb;
 526         if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req, IPOIB_UD_TX_SG))) {
 527                 if_inc_counter(dev, IFCOUNTER_OERRORS, 1);
 528                 if (tx_req->mb)
 529                         m_freem(tx_req->mb);
 530                 return;
 531         }
 532
 533         if (mb->m_pkthdr.csum_flags & (CSUM_IP|CSUM_TCP|CSUM_UDP))
 534                 priv->tx_wr.wr.send_flags |= IB_SEND_IP_CSUM;
 535         else
 536                 priv->tx_wr.wr.send_flags &= ~IB_SEND_IP_CSUM;
 537
 538         if (++priv->tx_outstanding == ipoib_sendq_size) {
 539                 ipoib_dbg(priv, "TX ring full, stopping kernel net queue\n");
 540                 if (ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP))
 541                         ipoib_warn(priv, "request notify on send CQ failed\n");
 542                 dev->if_drv_flags |= IFF_DRV_OACTIVE;
 543         }
 544
 545         if (unlikely(post_send(priv,
 546             priv->tx_head & (ipoib_sendq_size - 1), address->ah, qpn,
 547             tx_req, phead, hlen))) {
 548                 ipoib_warn(priv, "post_send failed\n");
 549                 if_inc_counter(dev, IFCOUNTER_OERRORS, 1);
 550                 --priv->tx_outstanding;
 551                 ipoib_dma_unmap_tx(priv->ca, tx_req);
 552                 m_freem(mb);
 553                 if (dev->if_drv_flags & IFF_DRV_OACTIVE)
 554                         dev->if_drv_flags &= ~IFF_DRV_OACTIVE;
 555         } else {
 556                 address->last_send = priv->tx_head;
 557                 ++priv->tx_head;
 558         }
 559 }
 560
 561 static void __ipoib_reap_ah(struct ipoib_dev_priv *priv)
 562 {
 563         struct ipoib_ah *ah, *tah;
 564         LIST_HEAD(remove_list);
 565         unsigned long flags;
 566
 567         spin_lock_irqsave(&priv->lock, flags);
 568
 569         list_for_each_entry_safe(ah, tah, &priv->dead_ahs, list)
 570                 if ((int) priv->tx_tail - (int) ah->last_send >= 0) {
 571                         list_del(&ah->list);
 572                         ib_destroy_ah(ah->ah);
 573                         kfree(ah);
 574                 }
 575
 576         spin_unlock_irqrestore(&priv->lock, flags);
 577 }
 578
 579 void ipoib_reap_ah(struct work_struct *work)
 580 {
 581         struct ipoib_dev_priv *priv =
 582                 container_of(work, struct ipoib_dev_priv, ah_reap_task.work);
 583
 584         __ipoib_reap_ah(priv);
 585
 586         if (!test_bit(IPOIB_STOP_REAPER, &priv->flags))
 587                 queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task,
 588                                    HZ);
 589 }
 590
 591 static void ipoib_ah_dev_cleanup(struct ipoib_dev_priv *priv)
 592 {
 593         unsigned long begin;
 594
 595         begin = jiffies;
 596
 597         while (!list_empty(&priv->dead_ahs)) {
 598                 __ipoib_reap_ah(priv);
 599
 600                 if (time_after(jiffies, begin + HZ)) {
 601                         ipoib_warn(priv, "timing out; will leak address handles\n");
 602                         break;
 603                 }
 604
 605                 msleep(1);
 606         }
 607 }
 608
 609 static void ipoib_ib_tx_timer_func(unsigned long ctx)
 610 {
 611         drain_tx_cq((struct ipoib_dev_priv *)ctx);
 612 }
 613
 614 int ipoib_ib_dev_open(struct ipoib_dev_priv *priv)
 615 {
 616         int ret;
 617
 618         if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &priv->pkey_index)) {
 619                 ipoib_warn(priv, "P_Key 0x%04x not found\n", priv->pkey);
 620                 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 621                 return -1;
 622         }
 623         set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 624
 625         ret = ipoib_init_qp(priv);
 626         if (ret) {
 627                 ipoib_warn(priv, "ipoib_init_qp returned %d\n", ret);
 628                 return -1;
 629         }
 630
 631         ret = ipoib_ib_post_receives(priv);
 632         if (ret) {
 633                 ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret);
 634                 ipoib_ib_dev_stop(priv, 1);
 635                 return -1;
 636         }
 637
 638         ret = ipoib_cm_dev_open(priv);
 639         if (ret) {
 640                 ipoib_warn(priv, "ipoib_cm_dev_open returned %d\n", ret);
 641                 ipoib_ib_dev_stop(priv, 1);
 642                 return -1;
 643         }
 644
 645         clear_bit(IPOIB_STOP_REAPER, &priv->flags);
 646         queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task, HZ);
 647
 648         set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
 649
 650         return 0;
 651 }
 652
 653 static void ipoib_pkey_dev_check_presence(struct ipoib_dev_priv *priv)
 654 {
 655         u16 pkey_index = 0;
 656
 657         if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &pkey_index))
 658                 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 659         else
 660                 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 661 }
 662
 663 int ipoib_ib_dev_up(struct ipoib_dev_priv *priv)
 664 {
 665
 666         ipoib_pkey_dev_check_presence(priv);
 667
 668         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
 669                 ipoib_dbg(priv, "PKEY is not assigned.\n");
 670                 return 0;
 671         }
 672
 673         set_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
 674
 675         return ipoib_mcast_start_thread(priv);
 676 }
 677
 678 int ipoib_ib_dev_down(struct ipoib_dev_priv *priv, int flush)
 679 {
 680
 681         ipoib_dbg(priv, "downing ib_dev\n");
 682
 683         clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
 684         if_link_state_change(priv->dev, LINK_STATE_DOWN);
 685
 686         /* Shutdown the P_Key thread if still active */
 687         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
 688                 mutex_lock(&pkey_mutex);
 689                 set_bit(IPOIB_PKEY_STOP, &priv->flags);
 690                 cancel_delayed_work(&priv->pkey_poll_task);
 691                 mutex_unlock(&pkey_mutex);
 692                 if (flush)
 693                         flush_workqueue(ipoib_workqueue);
 694         }
 695
 696         ipoib_mcast_stop_thread(priv, flush);
 697         ipoib_mcast_dev_flush(priv);
 698
 699         ipoib_flush_paths(priv);
 700
 701         return 0;
 702 }
 703
 704 static int recvs_pending(struct ipoib_dev_priv *priv)
 705 {
 706         int pending = 0;
 707         int i;
 708
 709         for (i = 0; i < ipoib_recvq_size; ++i)
 710                 if (priv->rx_ring[i].mb)
 711                         ++pending;
 712
 713         return pending;
 714 }
 715
 716 static void check_qp_movement_and_print(struct ipoib_dev_priv *priv,
 717                                         struct ib_qp *qp,
 718                                         enum ib_qp_state new_state)
 719 {
 720         struct ib_qp_attr qp_attr;
 721         struct ib_qp_init_attr query_init_attr;
 722         int ret;
 723
 724         ret = ib_query_qp(qp, &qp_attr, IB_QP_STATE, &query_init_attr);
 725         if (ret) {
 726                 ipoib_warn(priv, "%s: Failed to query QP (%d)\n", __func__, ret);
 727                 return;
 728         }
 729
 730         /* print according to the new-state and the previous state */
 731         if (new_state == IB_QPS_ERR && qp_attr.qp_state == IB_QPS_RESET) {
 732                 ipoib_dbg(priv, "Failed to modify QP %d->%d, acceptable\n",
 733                           qp_attr.qp_state, new_state);
 734         } else {
 735                 ipoib_warn(priv, "Failed to modify QP %d->%d\n",
 736                            qp_attr.qp_state, new_state);
 737         }
 738 }
 739
 740 void ipoib_drain_cq(struct ipoib_dev_priv *priv)
 741 {
 742         int i, n;
 743
 744         spin_lock(&priv->drain_lock);
 745         do {
 746                 n = ib_poll_cq(priv->recv_cq, IPOIB_NUM_WC, priv->ibwc);
 747                 for (i = 0; i < n; ++i) {
 748                         /*
 749                          * Convert any successful completions to flush
 750                          * errors to avoid passing packets up the
 751                          * stack after bringing the device down.
 752                          */
 753                         if (priv->ibwc[i].status == IB_WC_SUCCESS)
 754                                 priv->ibwc[i].status = IB_WC_WR_FLUSH_ERR;
 755
 756                         if ((priv->ibwc[i].wr_id & IPOIB_OP_RECV) == 0)
 757                                 panic("ipoib_drain_cq:  Bad wrid 0x%jX\n",
 758                                     (intmax_t)priv->ibwc[i].wr_id);
 759                         if (priv->ibwc[i].wr_id & IPOIB_OP_CM)
 760                                 ipoib_cm_handle_rx_wc(priv, priv->ibwc + i);
 761                         else
 762                                 ipoib_ib_handle_rx_wc(priv, priv->ibwc + i);
 763                 }
 764         } while (n == IPOIB_NUM_WC);
 765         spin_unlock(&priv->drain_lock);
 766
 767         spin_lock(&priv->lock);
 768         while (ipoib_poll_tx(priv, true))
 769                 ; /* nothing */
 770
 771         spin_unlock(&priv->lock);
 772 }
 773
 774 int ipoib_ib_dev_stop(struct ipoib_dev_priv *priv, int flush)
 775 {
 776         struct ib_qp_attr qp_attr;
 777         unsigned long begin;
 778         struct ipoib_tx_buf *tx_req;
 779         int i;
 780
 781         clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
 782
 783         ipoib_cm_dev_stop(priv);
 784
 785         /*
 786          * Move our QP to the error state and then reinitialize in
 787          * when all work requests have completed or have been flushed.
 788          */
 789         qp_attr.qp_state = IB_QPS_ERR;
 790         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
 791                 check_qp_movement_and_print(priv, priv->qp, IB_QPS_ERR);
 792
 793         /* Wait for all sends and receives to complete */
 794         begin = jiffies;
 795
 796         while (priv->tx_head != priv->tx_tail || recvs_pending(priv)) {
 797                 if (time_after(jiffies, begin + 5 * HZ)) {
 798                         ipoib_warn(priv, "timing out; %d sends %d receives not completed\n",
 799                                    priv->tx_head - priv->tx_tail, recvs_pending(priv));
 800
 801                         /*
 802                          * assume the HW is wedged and just free up
 803                          * all our pending work requests.
 804                          */
 805                         while ((int) priv->tx_tail - (int) priv->tx_head < 0) {
 806                                 tx_req = &priv->tx_ring[priv->tx_tail &
 807                                                         (ipoib_sendq_size - 1)];
 808                                 ipoib_dma_unmap_tx(priv->ca, tx_req);
 809                                 m_freem(tx_req->mb);
 810                                 ++priv->tx_tail;
 811                                 --priv->tx_outstanding;
 812                         }
 813
 814                         for (i = 0; i < ipoib_recvq_size; ++i) {
 815                                 struct ipoib_rx_buf *rx_req;
 816
 817                                 rx_req = &priv->rx_ring[i];
 818                                 if (!rx_req->mb)
 819                                         continue;
 820                                 ipoib_dma_unmap_rx(priv, &priv->rx_ring[i]);
 821                                 m_freem(rx_req->mb);
 822                                 rx_req->mb = NULL;
 823                         }
 824
 825                         goto timeout;
 826                 }
 827
 828                 ipoib_drain_cq(priv);
 829
 830                 msleep(1);
 831         }
 832
 833         ipoib_dbg(priv, "All sends and receives done.\n");
 834
 835 timeout:
 836         del_timer_sync(&priv->poll_timer);
 837         qp_attr.qp_state = IB_QPS_RESET;
 838         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
 839                 ipoib_warn(priv, "Failed to modify QP to RESET state\n");
 840
 841         /* Wait for all AHs to be reaped */
 842         set_bit(IPOIB_STOP_REAPER, &priv->flags);
 843         cancel_delayed_work(&priv->ah_reap_task);
 844         if (flush)
 845                 flush_workqueue(ipoib_workqueue);
 846
 847         ipoib_ah_dev_cleanup(priv);
 848
 849         ib_req_notify_cq(priv->recv_cq, IB_CQ_NEXT_COMP);
 850
 851         return 0;
 852 }
 853
 854 int ipoib_ib_dev_init(struct ipoib_dev_priv *priv, struct ib_device *ca, int port)
 855 {
 856         struct ifnet *dev = priv->dev;
 857
 858         priv->ca = ca;
 859         priv->port = port;
 860         priv->qp = NULL;
 861
 862         if (ipoib_transport_dev_init(priv, ca)) {
 863                 printk(KERN_WARNING "%s: ipoib_transport_dev_init failed\n", ca->name);
 864                 return -ENODEV;
 865         }
 866
 867         setup_timer(&priv->poll_timer, ipoib_ib_tx_timer_func,
 868                     (unsigned long) priv);
 869
 870         if (dev->if_flags & IFF_UP) {
 871                 if (ipoib_ib_dev_open(priv)) {
 872                         ipoib_transport_dev_cleanup(priv);
 873                         return -ENODEV;
 874                 }
 875         }
 876
 877         return 0;
 878 }
 879
 880 static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv,
 881                                 enum ipoib_flush_level level)
 882 {
 883         struct ipoib_dev_priv *cpriv;
 884         u16 new_index;
 885
 886         mutex_lock(&priv->vlan_mutex);
 887
 888         /*
 889          * Flush any child interfaces too -- they might be up even if
 890          * the parent is down.
 891          */
 892         list_for_each_entry(cpriv, &priv->child_intfs, list)
 893                 __ipoib_ib_dev_flush(cpriv, level);
 894
 895         mutex_unlock(&priv->vlan_mutex);
 896
 897         if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) {
 898                 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n");
 899                 return;
 900         }
 901
 902         if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
 903                 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n");
 904                 return;
 905         }
 906
 907         if (level == IPOIB_FLUSH_HEAVY) {
 908                 if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &new_index)) {
 909                         clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 910                         ipoib_ib_dev_down(priv, 0);
 911                         ipoib_ib_dev_stop(priv, 0);
 912                         if (ipoib_pkey_dev_delay_open(priv))
 913                                 return;
 914                 }
 915
 916                 /* restart QP only if P_Key index is changed */
 917                 if (test_and_set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags) &&
 918                     new_index == priv->pkey_index) {
 919                         ipoib_dbg(priv, "Not flushing - P_Key index not changed.\n");
 920                         return;
 921                 }
 922                 priv->pkey_index = new_index;
 923         }
 924
 925         if (level == IPOIB_FLUSH_LIGHT) {
 926                 ipoib_mark_paths_invalid(priv);
 927                 ipoib_mcast_dev_flush(priv);
 928         }
 929
 930         if (level >= IPOIB_FLUSH_NORMAL)
 931                 ipoib_ib_dev_down(priv, 0);
 932
 933         if (level == IPOIB_FLUSH_HEAVY) {
 934                 ipoib_ib_dev_stop(priv, 0);
 935                 ipoib_ib_dev_open(priv);
 936         }
 937
 938         /*
 939          * The device could have been brought down between the start and when
 940          * we get here, don't bring it back up if it's not configured up
 941          */
 942         if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
 943                 if (level >= IPOIB_FLUSH_NORMAL)
 944                         ipoib_ib_dev_up(priv);
 945                 ipoib_mcast_restart_task(&priv->restart_task);
 946         }
 947 }
 948
 949 void ipoib_ib_dev_flush_light(struct work_struct *work)
 950 {
 951         struct ipoib_dev_priv *priv =
 952                 container_of(work, struct ipoib_dev_priv, flush_light);
 953
 954         __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_LIGHT);
 955 }
 956
 957 void ipoib_ib_dev_flush_normal(struct work_struct *work)
 958 {
 959         struct ipoib_dev_priv *priv =
 960                 container_of(work, struct ipoib_dev_priv, flush_normal);
 961
 962         __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_NORMAL);
 963 }
 964
 965 void ipoib_ib_dev_flush_heavy(struct work_struct *work)
 966 {
 967         struct ipoib_dev_priv *priv =
 968                 container_of(work, struct ipoib_dev_priv, flush_heavy);
 969
 970         __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_HEAVY);
 971 }
 972
 973 void ipoib_ib_dev_cleanup(struct ipoib_dev_priv *priv)
 974 {
 975
 976         ipoib_dbg(priv, "cleaning up ib_dev\n");
 977
 978         ipoib_mcast_stop_thread(priv, 1);
 979         ipoib_mcast_dev_flush(priv);
 980
 981         ipoib_ah_dev_cleanup(priv);
 982         ipoib_transport_dev_cleanup(priv);
 983 }
 984
 985 /*
 986  * Delayed P_Key Assigment Interim Support
 987  *
 988  * The following is initial implementation of delayed P_Key assigment
 989  * mechanism. It is using the same approach implemented for the multicast
 990  * group join. The single goal of this implementation is to quickly address
 991  * Bug #2507. This implementation will probably be removed when the P_Key
 992  * change async notification is available.
 993  */
 994
 995 void ipoib_pkey_poll(struct work_struct *work)
 996 {
 997         struct ipoib_dev_priv *priv =
 998                 container_of(work, struct ipoib_dev_priv, pkey_poll_task.work);
 999
1000         ipoib_pkey_dev_check_presence(priv);
1001
1002         if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags))
1003                 ipoib_open(priv);
1004         else {
1005                 mutex_lock(&pkey_mutex);
1006                 if (!test_bit(IPOIB_PKEY_STOP, &priv->flags))
1007                         queue_delayed_work(ipoib_workqueue,
1008                                            &priv->pkey_poll_task,
1009                                            HZ);
1010                 mutex_unlock(&pkey_mutex);
1011         }
1012 }
1013
1014 int ipoib_pkey_dev_delay_open(struct ipoib_dev_priv *priv)
1015 {
1016
1017         /* Look for the interface pkey value in the IB Port P_Key table and */
1018         /* set the interface pkey assigment flag                            */
1019         ipoib_pkey_dev_check_presence(priv);
1020
1021         /* P_Key value not assigned yet - start polling */
1022         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
1023                 mutex_lock(&pkey_mutex);
1024                 clear_bit(IPOIB_PKEY_STOP, &priv->flags);
1025                 queue_delayed_work(ipoib_workqueue,
1026                                    &priv->pkey_poll_task,
1027                                    HZ);
1028                 mutex_unlock(&pkey_mutex);
1029                 return 1;
1030         }
1031
1032         return 0;
1033 }