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