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)
 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         return n == MAX_SEND_CQE;
 383 }
 384
 385 static void
 386 ipoib_poll(struct ipoib_dev_priv *priv)
 387 {
 388         int n, i;
 389
 390 poll_more:
 391         spin_lock(&priv->drain_lock);
 392         for (;;) {
 393                 n = ib_poll_cq(priv->recv_cq, IPOIB_NUM_WC, priv->ibwc);
 394                 for (i = 0; i < n; i++) {
 395                         struct ib_wc *wc = priv->ibwc + i;
 396
 397                         if ((wc->wr_id & IPOIB_OP_RECV) == 0)
 398                                 panic("ipoib_poll: Bad wr_id 0x%jX\n",
 399                                     (intmax_t)wc->wr_id);
 400                         if (wc->wr_id & IPOIB_OP_CM)
 401                                 ipoib_cm_handle_rx_wc(priv, wc);
 402                         else
 403                                 ipoib_ib_handle_rx_wc(priv, wc);
 404                 }
 405
 406                 if (n != IPOIB_NUM_WC)
 407                         break;
 408         }
 409         spin_unlock(&priv->drain_lock);
 410
 411         if (ib_req_notify_cq(priv->recv_cq,
 412             IB_CQ_NEXT_COMP | IB_CQ_REPORT_MISSED_EVENTS))
 413                 goto poll_more;
 414 }
 415
 416 void ipoib_ib_completion(struct ib_cq *cq, void *dev_ptr)
 417 {
 418         struct ipoib_dev_priv *priv = dev_ptr;
 419
 420         ipoib_poll(priv);
 421 }
 422
 423 static void drain_tx_cq(struct ipoib_dev_priv *priv)
 424 {
 425         struct ifnet *dev = priv->dev;
 426
 427         spin_lock(&priv->lock);
 428         while (ipoib_poll_tx(priv))
 429                 ; /* nothing */
 430
 431         if (dev->if_drv_flags & IFF_DRV_OACTIVE)
 432                 mod_timer(&priv->poll_timer, jiffies + 1);
 433
 434         spin_unlock(&priv->lock);
 435 }
 436
 437 void ipoib_send_comp_handler(struct ib_cq *cq, void *dev_ptr)
 438 {
 439         struct ipoib_dev_priv *priv = dev_ptr;
 440
 441         mod_timer(&priv->poll_timer, jiffies);
 442 }
 443
 444 static inline int
 445 post_send(struct ipoib_dev_priv *priv, unsigned int wr_id,
 446     struct ib_ah *address, u32 qpn, struct ipoib_tx_buf *tx_req, void *head,
 447     int hlen)
 448 {
 449         struct ib_send_wr *bad_wr;
 450         struct mbuf *mb = tx_req->mb;
 451         u64 *mapping = tx_req->mapping;
 452         struct mbuf *m;
 453         int i;
 454
 455         for (m = mb, i = 0; m != NULL; m = m->m_next, i++) {
 456                 priv->tx_sge[i].addr         = mapping[i];
 457                 priv->tx_sge[i].length       = m->m_len;
 458         }
 459         priv->tx_wr.wr.num_sge  = i;
 460         priv->tx_wr.wr.wr_id    = wr_id;
 461         priv->tx_wr.remote_qpn  = qpn;
 462         priv->tx_wr.ah          = address;
 463
 464         if (head) {
 465                 priv->tx_wr.mss         = 0; /* XXX mb_shinfo(mb)->gso_size; */
 466                 priv->tx_wr.header      = head;
 467                 priv->tx_wr.hlen        = hlen;
 468                 priv->tx_wr.wr.opcode   = IB_WR_LSO;
 469         } else
 470                 priv->tx_wr.wr.opcode   = IB_WR_SEND;
 471
 472         return ib_post_send(priv->qp, &priv->tx_wr.wr, &bad_wr);
 473 }
 474
 475 void
 476 ipoib_send(struct ipoib_dev_priv *priv, struct mbuf *mb,
 477     struct ipoib_ah *address, u32 qpn)
 478 {
 479         struct ifnet *dev = priv->dev;
 480         struct ipoib_tx_buf *tx_req;
 481         int hlen;
 482         void *phead;
 483
 484         if (unlikely(priv->tx_outstanding > MAX_SEND_CQE))
 485                 while (ipoib_poll_tx(priv))
 486                         ; /* nothing */
 487
 488         m_adj(mb, sizeof (struct ipoib_pseudoheader));
 489         if (0 /* XXX segment offload mb_is_gso(mb) */) {
 490                 /* XXX hlen = mb_transport_offset(mb) + tcp_hdrlen(mb); */
 491                 phead = mtod(mb, void *);
 492                 if (mb->m_len < hlen) {
 493                         ipoib_warn(priv, "linear data too small\n");
 494                         if_inc_counter(dev, IFCOUNTER_OERRORS, 1);
 495                         m_freem(mb);
 496                         return;
 497                 }
 498                 m_adj(mb, hlen);
 499         } else {
 500                 if (unlikely(mb->m_pkthdr.len - IPOIB_ENCAP_LEN > priv->mcast_mtu)) {
 501                         ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
 502                                    mb->m_pkthdr.len, priv->mcast_mtu);
 503                         if_inc_counter(dev, IFCOUNTER_OERRORS, 1);
 504                         ipoib_cm_mb_too_long(priv, mb, priv->mcast_mtu);
 505                         return;
 506                 }
 507                 phead = NULL;
 508                 hlen  = 0;
 509         }
 510
 511         ipoib_dbg_data(priv, "sending packet, length=%d address=%p qpn=0x%06x\n",
 512                        mb->m_pkthdr.len, address, qpn);
 513
 514         /*
 515          * We put the mb into the tx_ring _before_ we call post_send()
 516          * because it's entirely possible that the completion handler will
 517          * run before we execute anything after the post_send().  That
 518          * means we have to make sure everything is properly recorded and
 519          * our state is consistent before we call post_send().
 520          */
 521         tx_req = &priv->tx_ring[priv->tx_head & (ipoib_sendq_size - 1)];
 522         tx_req->mb = mb;
 523         if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req, IPOIB_UD_TX_SG))) {
 524                 if_inc_counter(dev, IFCOUNTER_OERRORS, 1);
 525                 if (tx_req->mb)
 526                         m_freem(tx_req->mb);
 527                 return;
 528         }
 529
 530         if (mb->m_pkthdr.csum_flags & (CSUM_IP|CSUM_TCP|CSUM_UDP))
 531                 priv->tx_wr.wr.send_flags |= IB_SEND_IP_CSUM;
 532         else
 533                 priv->tx_wr.wr.send_flags &= ~IB_SEND_IP_CSUM;
 534
 535         if (++priv->tx_outstanding == ipoib_sendq_size) {
 536                 ipoib_dbg(priv, "TX ring full, stopping kernel net queue\n");
 537                 if (ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP))
 538                         ipoib_warn(priv, "request notify on send CQ failed\n");
 539                 dev->if_drv_flags |= IFF_DRV_OACTIVE;
 540         }
 541
 542         if (unlikely(post_send(priv,
 543             priv->tx_head & (ipoib_sendq_size - 1), address->ah, qpn,
 544             tx_req, phead, hlen))) {
 545                 ipoib_warn(priv, "post_send failed\n");
 546                 if_inc_counter(dev, IFCOUNTER_OERRORS, 1);
 547                 --priv->tx_outstanding;
 548                 ipoib_dma_unmap_tx(priv->ca, tx_req);
 549                 m_freem(mb);
 550                 if (dev->if_drv_flags & IFF_DRV_OACTIVE)
 551                         dev->if_drv_flags &= ~IFF_DRV_OACTIVE;
 552         } else {
 553                 address->last_send = priv->tx_head;
 554                 ++priv->tx_head;
 555         }
 556 }
 557
 558 static void __ipoib_reap_ah(struct ipoib_dev_priv *priv)
 559 {
 560         struct ipoib_ah *ah, *tah;
 561         LIST_HEAD(remove_list);
 562         unsigned long flags;
 563
 564         spin_lock_irqsave(&priv->lock, flags);
 565
 566         list_for_each_entry_safe(ah, tah, &priv->dead_ahs, list)
 567                 if ((int) priv->tx_tail - (int) ah->last_send >= 0) {
 568                         list_del(&ah->list);
 569                         ib_destroy_ah(ah->ah);
 570                         kfree(ah);
 571                 }
 572
 573         spin_unlock_irqrestore(&priv->lock, flags);
 574 }
 575
 576 void ipoib_reap_ah(struct work_struct *work)
 577 {
 578         struct ipoib_dev_priv *priv =
 579                 container_of(work, struct ipoib_dev_priv, ah_reap_task.work);
 580
 581         __ipoib_reap_ah(priv);
 582
 583         if (!test_bit(IPOIB_STOP_REAPER, &priv->flags))
 584                 queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task,
 585                                    HZ);
 586 }
 587
 588 static void ipoib_ah_dev_cleanup(struct ipoib_dev_priv *priv)
 589 {
 590         unsigned long begin;
 591
 592         begin = jiffies;
 593
 594         while (!list_empty(&priv->dead_ahs)) {
 595                 __ipoib_reap_ah(priv);
 596
 597                 if (time_after(jiffies, begin + HZ)) {
 598                         ipoib_warn(priv, "timing out; will leak address handles\n");
 599                         break;
 600                 }
 601
 602                 msleep(1);
 603         }
 604 }
 605
 606 static void ipoib_ib_tx_timer_func(unsigned long ctx)
 607 {
 608         drain_tx_cq((struct ipoib_dev_priv *)ctx);
 609 }
 610
 611 int ipoib_ib_dev_open(struct ipoib_dev_priv *priv)
 612 {
 613         int ret;
 614
 615         if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &priv->pkey_index)) {
 616                 ipoib_warn(priv, "P_Key 0x%04x not found\n", priv->pkey);
 617                 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 618                 return -1;
 619         }
 620         set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 621
 622         ret = ipoib_init_qp(priv);
 623         if (ret) {
 624                 ipoib_warn(priv, "ipoib_init_qp returned %d\n", ret);
 625                 return -1;
 626         }
 627
 628         ret = ipoib_ib_post_receives(priv);
 629         if (ret) {
 630                 ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret);
 631                 ipoib_ib_dev_stop(priv, 1);
 632                 return -1;
 633         }
 634
 635         ret = ipoib_cm_dev_open(priv);
 636         if (ret) {
 637                 ipoib_warn(priv, "ipoib_cm_dev_open returned %d\n", ret);
 638                 ipoib_ib_dev_stop(priv, 1);
 639                 return -1;
 640         }
 641
 642         clear_bit(IPOIB_STOP_REAPER, &priv->flags);
 643         queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task, HZ);
 644
 645         set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
 646
 647         return 0;
 648 }
 649
 650 static void ipoib_pkey_dev_check_presence(struct ipoib_dev_priv *priv)
 651 {
 652         u16 pkey_index = 0;
 653
 654         if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &pkey_index))
 655                 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 656         else
 657                 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 658 }
 659
 660 int ipoib_ib_dev_up(struct ipoib_dev_priv *priv)
 661 {
 662
 663         ipoib_pkey_dev_check_presence(priv);
 664
 665         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
 666                 ipoib_dbg(priv, "PKEY is not assigned.\n");
 667                 return 0;
 668         }
 669
 670         set_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
 671
 672         return ipoib_mcast_start_thread(priv);
 673 }
 674
 675 int ipoib_ib_dev_down(struct ipoib_dev_priv *priv, int flush)
 676 {
 677
 678         ipoib_dbg(priv, "downing ib_dev\n");
 679
 680         clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
 681         if_link_state_change(priv->dev, LINK_STATE_DOWN);
 682
 683         /* Shutdown the P_Key thread if still active */
 684         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
 685                 mutex_lock(&pkey_mutex);
 686                 set_bit(IPOIB_PKEY_STOP, &priv->flags);
 687                 cancel_delayed_work(&priv->pkey_poll_task);
 688                 mutex_unlock(&pkey_mutex);
 689                 if (flush)
 690                         flush_workqueue(ipoib_workqueue);
 691         }
 692
 693         ipoib_mcast_stop_thread(priv, flush);
 694         ipoib_mcast_dev_flush(priv);
 695
 696         ipoib_flush_paths(priv);
 697
 698         return 0;
 699 }
 700
 701 static int recvs_pending(struct ipoib_dev_priv *priv)
 702 {
 703         int pending = 0;
 704         int i;
 705
 706         for (i = 0; i < ipoib_recvq_size; ++i)
 707                 if (priv->rx_ring[i].mb)
 708                         ++pending;
 709
 710         return pending;
 711 }
 712
 713 void ipoib_drain_cq(struct ipoib_dev_priv *priv)
 714 {
 715         int i, n;
 716
 717         spin_lock(&priv->drain_lock);
 718         do {
 719                 n = ib_poll_cq(priv->recv_cq, IPOIB_NUM_WC, priv->ibwc);
 720                 for (i = 0; i < n; ++i) {
 721                         /*
 722                          * Convert any successful completions to flush
 723                          * errors to avoid passing packets up the
 724                          * stack after bringing the device down.
 725                          */
 726                         if (priv->ibwc[i].status == IB_WC_SUCCESS)
 727                                 priv->ibwc[i].status = IB_WC_WR_FLUSH_ERR;
 728
 729                         if ((priv->ibwc[i].wr_id & IPOIB_OP_RECV) == 0)
 730                                 panic("ipoib_drain_cq:  Bad wrid 0x%jX\n",
 731                                     (intmax_t)priv->ibwc[i].wr_id);
 732                         if (priv->ibwc[i].wr_id & IPOIB_OP_CM)
 733                                 ipoib_cm_handle_rx_wc(priv, priv->ibwc + i);
 734                         else
 735                                 ipoib_ib_handle_rx_wc(priv, priv->ibwc + i);
 736                 }
 737         } while (n == IPOIB_NUM_WC);
 738         spin_unlock(&priv->drain_lock);
 739
 740         spin_lock(&priv->lock);
 741         while (ipoib_poll_tx(priv))
 742                 ; /* nothing */
 743
 744         spin_unlock(&priv->lock);
 745 }
 746
 747 int ipoib_ib_dev_stop(struct ipoib_dev_priv *priv, int flush)
 748 {
 749         struct ib_qp_attr qp_attr;
 750         unsigned long begin;
 751         struct ipoib_tx_buf *tx_req;
 752         int i;
 753
 754         clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
 755
 756         ipoib_cm_dev_stop(priv);
 757
 758         /*
 759          * Move our QP to the error state and then reinitialize in
 760          * when all work requests have completed or have been flushed.
 761          */
 762         qp_attr.qp_state = IB_QPS_ERR;
 763         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
 764                 ipoib_warn(priv, "Failed to modify QP to ERROR state\n");
 765
 766         /* Wait for all sends and receives to complete */
 767         begin = jiffies;
 768
 769         while (priv->tx_head != priv->tx_tail || recvs_pending(priv)) {
 770                 if (time_after(jiffies, begin + 5 * HZ)) {
 771                         ipoib_warn(priv, "timing out; %d sends %d receives not completed\n",
 772                                    priv->tx_head - priv->tx_tail, recvs_pending(priv));
 773
 774                         /*
 775                          * assume the HW is wedged and just free up
 776                          * all our pending work requests.
 777                          */
 778                         while ((int) priv->tx_tail - (int) priv->tx_head < 0) {
 779                                 tx_req = &priv->tx_ring[priv->tx_tail &
 780                                                         (ipoib_sendq_size - 1)];
 781                                 ipoib_dma_unmap_tx(priv->ca, tx_req);
 782                                 m_freem(tx_req->mb);
 783                                 ++priv->tx_tail;
 784                                 --priv->tx_outstanding;
 785                         }
 786
 787                         for (i = 0; i < ipoib_recvq_size; ++i) {
 788                                 struct ipoib_rx_buf *rx_req;
 789
 790                                 rx_req = &priv->rx_ring[i];
 791                                 if (!rx_req->mb)
 792                                         continue;
 793                                 ipoib_dma_unmap_rx(priv, &priv->rx_ring[i]);
 794                                 m_freem(rx_req->mb);
 795                                 rx_req->mb = NULL;
 796                         }
 797
 798                         goto timeout;
 799                 }
 800
 801                 ipoib_drain_cq(priv);
 802
 803                 msleep(1);
 804         }
 805
 806         ipoib_dbg(priv, "All sends and receives done.\n");
 807
 808 timeout:
 809         del_timer_sync(&priv->poll_timer);
 810         qp_attr.qp_state = IB_QPS_RESET;
 811         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
 812                 ipoib_warn(priv, "Failed to modify QP to RESET state\n");
 813
 814         /* Wait for all AHs to be reaped */
 815         set_bit(IPOIB_STOP_REAPER, &priv->flags);
 816         cancel_delayed_work(&priv->ah_reap_task);
 817         if (flush)
 818                 flush_workqueue(ipoib_workqueue);
 819
 820         ipoib_ah_dev_cleanup(priv);
 821
 822         ib_req_notify_cq(priv->recv_cq, IB_CQ_NEXT_COMP);
 823
 824         return 0;
 825 }
 826
 827 int ipoib_ib_dev_init(struct ipoib_dev_priv *priv, struct ib_device *ca, int port)
 828 {
 829         struct ifnet *dev = priv->dev;
 830
 831         priv->ca = ca;
 832         priv->port = port;
 833         priv->qp = NULL;
 834
 835         if (ipoib_transport_dev_init(priv, ca)) {
 836                 printk(KERN_WARNING "%s: ipoib_transport_dev_init failed\n", ca->name);
 837                 return -ENODEV;
 838         }
 839
 840         setup_timer(&priv->poll_timer, ipoib_ib_tx_timer_func,
 841                     (unsigned long) priv);
 842
 843         if (dev->if_flags & IFF_UP) {
 844                 if (ipoib_ib_dev_open(priv)) {
 845                         ipoib_transport_dev_cleanup(priv);
 846                         return -ENODEV;
 847                 }
 848         }
 849
 850         return 0;
 851 }
 852
 853 static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv,
 854                                 enum ipoib_flush_level level)
 855 {
 856         struct ipoib_dev_priv *cpriv;
 857         u16 new_index;
 858
 859         mutex_lock(&priv->vlan_mutex);
 860
 861         /*
 862          * Flush any child interfaces too -- they might be up even if
 863          * the parent is down.
 864          */
 865         list_for_each_entry(cpriv, &priv->child_intfs, list)
 866                 __ipoib_ib_dev_flush(cpriv, level);
 867
 868         mutex_unlock(&priv->vlan_mutex);
 869
 870         if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) {
 871                 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n");
 872                 return;
 873         }
 874
 875         if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
 876                 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n");
 877                 return;
 878         }
 879
 880         if (level == IPOIB_FLUSH_HEAVY) {
 881                 if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &new_index)) {
 882                         clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 883                         ipoib_ib_dev_down(priv, 0);
 884                         ipoib_ib_dev_stop(priv, 0);
 885                         if (ipoib_pkey_dev_delay_open(priv))
 886                                 return;
 887                 }
 888
 889                 /* restart QP only if P_Key index is changed */
 890                 if (test_and_set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags) &&
 891                     new_index == priv->pkey_index) {
 892                         ipoib_dbg(priv, "Not flushing - P_Key index not changed.\n");
 893                         return;
 894                 }
 895                 priv->pkey_index = new_index;
 896         }
 897
 898         if (level == IPOIB_FLUSH_LIGHT) {
 899                 ipoib_mark_paths_invalid(priv);
 900                 ipoib_mcast_dev_flush(priv);
 901         }
 902
 903         if (level >= IPOIB_FLUSH_NORMAL)
 904                 ipoib_ib_dev_down(priv, 0);
 905
 906         if (level == IPOIB_FLUSH_HEAVY) {
 907                 ipoib_ib_dev_stop(priv, 0);
 908                 ipoib_ib_dev_open(priv);
 909         }
 910
 911         /*
 912          * The device could have been brought down between the start and when
 913          * we get here, don't bring it back up if it's not configured up
 914          */
 915         if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
 916                 if (level >= IPOIB_FLUSH_NORMAL)
 917                         ipoib_ib_dev_up(priv);
 918                 ipoib_mcast_restart_task(&priv->restart_task);
 919         }
 920 }
 921
 922 void ipoib_ib_dev_flush_light(struct work_struct *work)
 923 {
 924         struct ipoib_dev_priv *priv =
 925                 container_of(work, struct ipoib_dev_priv, flush_light);
 926
 927         __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_LIGHT);
 928 }
 929
 930 void ipoib_ib_dev_flush_normal(struct work_struct *work)
 931 {
 932         struct ipoib_dev_priv *priv =
 933                 container_of(work, struct ipoib_dev_priv, flush_normal);
 934
 935         __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_NORMAL);
 936 }
 937
 938 void ipoib_ib_dev_flush_heavy(struct work_struct *work)
 939 {
 940         struct ipoib_dev_priv *priv =
 941                 container_of(work, struct ipoib_dev_priv, flush_heavy);
 942
 943         __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_HEAVY);
 944 }
 945
 946 void ipoib_ib_dev_cleanup(struct ipoib_dev_priv *priv)
 947 {
 948
 949         ipoib_dbg(priv, "cleaning up ib_dev\n");
 950
 951         ipoib_mcast_stop_thread(priv, 1);
 952         ipoib_mcast_dev_flush(priv);
 953
 954         ipoib_ah_dev_cleanup(priv);
 955         ipoib_transport_dev_cleanup(priv);
 956 }
 957
 958 /*
 959  * Delayed P_Key Assigment Interim Support
 960  *
 961  * The following is initial implementation of delayed P_Key assigment
 962  * mechanism. It is using the same approach implemented for the multicast
 963  * group join. The single goal of this implementation is to quickly address
 964  * Bug #2507. This implementation will probably be removed when the P_Key
 965  * change async notification is available.
 966  */
 967
 968 void ipoib_pkey_poll(struct work_struct *work)
 969 {
 970         struct ipoib_dev_priv *priv =
 971                 container_of(work, struct ipoib_dev_priv, pkey_poll_task.work);
 972
 973         ipoib_pkey_dev_check_presence(priv);
 974
 975         if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags))
 976                 ipoib_open(priv);
 977         else {
 978                 mutex_lock(&pkey_mutex);
 979                 if (!test_bit(IPOIB_PKEY_STOP, &priv->flags))
 980                         queue_delayed_work(ipoib_workqueue,
 981                                            &priv->pkey_poll_task,
 982                                            HZ);
 983                 mutex_unlock(&pkey_mutex);
 984         }
 985 }
 986
 987 int ipoib_pkey_dev_delay_open(struct ipoib_dev_priv *priv)
 988 {
 989
 990         /* Look for the interface pkey value in the IB Port P_Key table and */
 991         /* set the interface pkey assigment flag                            */
 992         ipoib_pkey_dev_check_presence(priv);
 993
 994         /* P_Key value not assigned yet - start polling */
 995         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
 996                 mutex_lock(&pkey_mutex);
 997                 clear_bit(IPOIB_PKEY_STOP, &priv->flags);
 998                 queue_delayed_work(ipoib_workqueue,
 999                                    &priv->pkey_poll_task,
1000                                    HZ);
1001                 mutex_unlock(&pkey_mutex);
1002                 return 1;
1003         }
1004
1005         return 0;
1006 }