net/rds/ib_cm.c

   1 /*
   2  * Copyright (c) 2006, 2019 Oracle and/or its affiliates. All rights reserved.
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  *
  32  */
  33 #include <linux/kernel.h>
  34 #include <linux/in.h>
  35 #include <linux/slab.h>
  36 #include <linux/vmalloc.h>
  37 #include <linux/ratelimit.h>
  38 #include <net/addrconf.h>
  39 #include <rdma/ib_cm.h>
  40
  41 #include "rds_single_path.h"
  42 #include "rds.h"
  43 #include "ib.h"
  44 #include "ib_mr.h"
  45
  46 /*
  47  * Set the selected protocol version
  48  */
  49 static void rds_ib_set_protocol(struct rds_connection *conn, unsigned int version)
  50 {
  51         conn->c_version = version;
  52 }
  53
  54 /*
  55  * Set up flow control
  56  */
  57 static void rds_ib_set_flow_control(struct rds_connection *conn, u32 credits)
  58 {
  59         struct rds_ib_connection *ic = conn->c_transport_data;
  60
  61         if (rds_ib_sysctl_flow_control && credits != 0) {
  62                 /* We're doing flow control */
  63                 ic->i_flowctl = 1;
  64                 rds_ib_send_add_credits(conn, credits);
  65         } else {
  66                 ic->i_flowctl = 0;
  67         }
  68 }
  69
  70 /*
  71  * Connection established.
  72  * We get here for both outgoing and incoming connection.
  73  */
  74 void rds_ib_cm_connect_complete(struct rds_connection *conn, struct rdma_cm_event *event)
  75 {
  76         struct rds_ib_connection *ic = conn->c_transport_data;
  77         const union rds_ib_conn_priv *dp = NULL;
  78         __be64 ack_seq = 0;
  79         __be32 credit = 0;
  80         u8 major = 0;
  81         u8 minor = 0;
  82         int err;
  83
  84         dp = event->param.conn.private_data;
  85         if (conn->c_isv6) {
  86                 if (event->param.conn.private_data_len >=
  87                     sizeof(struct rds6_ib_connect_private)) {
  88                         major = dp->ricp_v6.dp_protocol_major;
  89                         minor = dp->ricp_v6.dp_protocol_minor;
  90                         credit = dp->ricp_v6.dp_credit;
  91                         /* dp structure start is not guaranteed to be 8 bytes
  92                          * aligned.  Since dp_ack_seq is 64-bit extended load
  93                          * operations can be used so go through get_unaligned
  94                          * to avoid unaligned errors.
  95                          */
  96                         ack_seq = get_unaligned(&dp->ricp_v6.dp_ack_seq);
  97                 }
  98         } else if (event->param.conn.private_data_len >=
  99                    sizeof(struct rds_ib_connect_private)) {
 100                 major = dp->ricp_v4.dp_protocol_major;
 101                 minor = dp->ricp_v4.dp_protocol_minor;
 102                 credit = dp->ricp_v4.dp_credit;
 103                 ack_seq = get_unaligned(&dp->ricp_v4.dp_ack_seq);
 104         }
 105
 106         /* make sure it isn't empty data */
 107         if (major) {
 108                 rds_ib_set_protocol(conn, RDS_PROTOCOL(major, minor));
 109                 rds_ib_set_flow_control(conn, be32_to_cpu(credit));
 110         }
 111
 112         if (conn->c_version < RDS_PROTOCOL_VERSION) {
 113                 if (conn->c_version != RDS_PROTOCOL_COMPAT_VERSION) {
 114                         pr_notice("RDS/IB: Connection <%pI6c,%pI6c> version %u.%u no longer supported\n",
 115                                   &conn->c_laddr, &conn->c_faddr,
 116                                   RDS_PROTOCOL_MAJOR(conn->c_version),
 117                                   RDS_PROTOCOL_MINOR(conn->c_version));
 118                         rds_conn_destroy(conn);
 119                         return;
 120                 }
 121         }
 122
 123         pr_notice("RDS/IB: %s conn connected <%pI6c,%pI6c,%d> version %u.%u%s\n",
 124                   ic->i_active_side ? "Active" : "Passive",
 125                   &conn->c_laddr, &conn->c_faddr, conn->c_tos,
 126                   RDS_PROTOCOL_MAJOR(conn->c_version),
 127                   RDS_PROTOCOL_MINOR(conn->c_version),
 128                   ic->i_flowctl ? ", flow control" : "");
 129
 130         /* receive sl from the peer */
 131         ic->i_sl = ic->i_cm_id->route.path_rec->sl;
 132
 133         atomic_set(&ic->i_cq_quiesce, 0);
 134
 135         /* Init rings and fill recv. this needs to wait until protocol
 136          * negotiation is complete, since ring layout is different
 137          * from 3.1 to 4.1.
 138          */
 139         rds_ib_send_init_ring(ic);
 140         rds_ib_recv_init_ring(ic);
 141         /* Post receive buffers - as a side effect, this will update
 142          * the posted credit count. */
 143         rds_ib_recv_refill(conn, 1, GFP_KERNEL);
 144
 145         /* update ib_device with this local ipaddr */
 146         err = rds_ib_update_ipaddr(ic->rds_ibdev, &conn->c_laddr);
 147         if (err)
 148                 printk(KERN_ERR "rds_ib_update_ipaddr failed (%d)\n",
 149                         err);
 150
 151         /* If the peer gave us the last packet it saw, process this as if
 152          * we had received a regular ACK. */
 153         if (dp) {
 154                 if (ack_seq)
 155                         rds_send_drop_acked(conn, be64_to_cpu(ack_seq),
 156                                             NULL);
 157         }
 158
 159         conn->c_proposed_version = conn->c_version;
 160         rds_connect_complete(conn);
 161 }
 162
 163 static void rds_ib_cm_fill_conn_param(struct rds_connection *conn,
 164                                       struct rdma_conn_param *conn_param,
 165                                       union rds_ib_conn_priv *dp,
 166                                       u32 protocol_version,
 167                                       u32 max_responder_resources,
 168                                       u32 max_initiator_depth,
 169                                       bool isv6)
 170 {
 171         struct rds_ib_connection *ic = conn->c_transport_data;
 172         struct rds_ib_device *rds_ibdev = ic->rds_ibdev;
 173
 174         memset(conn_param, 0, sizeof(struct rdma_conn_param));
 175
 176         conn_param->responder_resources =
 177                 min_t(u32, rds_ibdev->max_responder_resources, max_responder_resources);
 178         conn_param->initiator_depth =
 179                 min_t(u32, rds_ibdev->max_initiator_depth, max_initiator_depth);
 180         conn_param->retry_count = min_t(unsigned int, rds_ib_retry_count, 7);
 181         conn_param->rnr_retry_count = 7;
 182
 183         if (dp) {
 184                 memset(dp, 0, sizeof(*dp));
 185                 if (isv6) {
 186                         dp->ricp_v6.dp_saddr = conn->c_laddr;
 187                         dp->ricp_v6.dp_daddr = conn->c_faddr;
 188                         dp->ricp_v6.dp_protocol_major =
 189                             RDS_PROTOCOL_MAJOR(protocol_version);
 190                         dp->ricp_v6.dp_protocol_minor =
 191                             RDS_PROTOCOL_MINOR(protocol_version);
 192                         dp->ricp_v6.dp_protocol_minor_mask =
 193                             cpu_to_be16(RDS_IB_SUPPORTED_PROTOCOLS);
 194                         dp->ricp_v6.dp_ack_seq =
 195                             cpu_to_be64(rds_ib_piggyb_ack(ic));
 196                         dp->ricp_v6.dp_cmn.ricpc_dp_toss = conn->c_tos;
 197
 198                         conn_param->private_data = &dp->ricp_v6;
 199                         conn_param->private_data_len = sizeof(dp->ricp_v6);
 200                 } else {
 201                         dp->ricp_v4.dp_saddr = conn->c_laddr.s6_addr32[3];
 202                         dp->ricp_v4.dp_daddr = conn->c_faddr.s6_addr32[3];
 203                         dp->ricp_v4.dp_protocol_major =
 204                             RDS_PROTOCOL_MAJOR(protocol_version);
 205                         dp->ricp_v4.dp_protocol_minor =
 206                             RDS_PROTOCOL_MINOR(protocol_version);
 207                         dp->ricp_v4.dp_protocol_minor_mask =
 208                             cpu_to_be16(RDS_IB_SUPPORTED_PROTOCOLS);
 209                         dp->ricp_v4.dp_ack_seq =
 210                             cpu_to_be64(rds_ib_piggyb_ack(ic));
 211                         dp->ricp_v4.dp_cmn.ricpc_dp_toss = conn->c_tos;
 212
 213                         conn_param->private_data = &dp->ricp_v4;
 214                         conn_param->private_data_len = sizeof(dp->ricp_v4);
 215                 }
 216
 217                 /* Advertise flow control */
 218                 if (ic->i_flowctl) {
 219                         unsigned int credits;
 220
 221                         credits = IB_GET_POST_CREDITS
 222                                 (atomic_read(&ic->i_credits));
 223                         if (isv6)
 224                                 dp->ricp_v6.dp_credit = cpu_to_be32(credits);
 225                         else
 226                                 dp->ricp_v4.dp_credit = cpu_to_be32(credits);
 227                         atomic_sub(IB_SET_POST_CREDITS(credits),
 228                                    &ic->i_credits);
 229                 }
 230         }
 231 }
 232
 233 static void rds_ib_cq_event_handler(struct ib_event *event, void *data)
 234 {
 235         rdsdebug("event %u (%s) data %p\n",
 236                  event->event, ib_event_msg(event->event), data);
 237 }
 238
 239 /* Plucking the oldest entry from the ring can be done concurrently with
 240  * the thread refilling the ring.  Each ring operation is protected by
 241  * spinlocks and the transient state of refilling doesn't change the
 242  * recording of which entry is oldest.
 243  *
 244  * This relies on IB only calling one cq comp_handler for each cq so that
 245  * there will only be one caller of rds_recv_incoming() per RDS connection.
 246  */
 247 static void rds_ib_cq_comp_handler_recv(struct ib_cq *cq, void *context)
 248 {
 249         struct rds_connection *conn = context;
 250         struct rds_ib_connection *ic = conn->c_transport_data;
 251
 252         rdsdebug("conn %p cq %p\n", conn, cq);
 253
 254         rds_ib_stats_inc(s_ib_evt_handler_call);
 255
 256         tasklet_schedule(&ic->i_recv_tasklet);
 257 }
 258
 259 static void poll_scq(struct rds_ib_connection *ic, struct ib_cq *cq,
 260                      struct ib_wc *wcs)
 261 {
 262         int nr, i;
 263         struct ib_wc *wc;
 264
 265         while ((nr = ib_poll_cq(cq, RDS_IB_WC_MAX, wcs)) > 0) {
 266                 for (i = 0; i < nr; i++) {
 267                         wc = wcs + i;
 268                         rdsdebug("wc wr_id 0x%llx status %u byte_len %u imm_data %u\n",
 269                                  (unsigned long long)wc->wr_id, wc->status,
 270                                  wc->byte_len, be32_to_cpu(wc->ex.imm_data));
 271
 272                         if (wc->wr_id <= ic->i_send_ring.w_nr ||
 273                             wc->wr_id == RDS_IB_ACK_WR_ID)
 274                                 rds_ib_send_cqe_handler(ic, wc);
 275                         else
 276                                 rds_ib_mr_cqe_handler(ic, wc);
 277
 278                 }
 279         }
 280 }
 281
 282 static void rds_ib_tasklet_fn_send(unsigned long data)
 283 {
 284         struct rds_ib_connection *ic = (struct rds_ib_connection *)data;
 285         struct rds_connection *conn = ic->conn;
 286
 287         rds_ib_stats_inc(s_ib_tasklet_call);
 288
 289         /* if cq has been already reaped, ignore incoming cq event */
 290         if (atomic_read(&ic->i_cq_quiesce))
 291                 return;
 292
 293         poll_scq(ic, ic->i_send_cq, ic->i_send_wc);
 294         ib_req_notify_cq(ic->i_send_cq, IB_CQ_NEXT_COMP);
 295         poll_scq(ic, ic->i_send_cq, ic->i_send_wc);
 296
 297         if (rds_conn_up(conn) &&
 298             (!test_bit(RDS_LL_SEND_FULL, &conn->c_flags) ||
 299             test_bit(0, &conn->c_map_queued)))
 300                 rds_send_xmit(&ic->conn->c_path[0]);
 301 }
 302
 303 static void poll_rcq(struct rds_ib_connection *ic, struct ib_cq *cq,
 304                      struct ib_wc *wcs,
 305                      struct rds_ib_ack_state *ack_state)
 306 {
 307         int nr, i;
 308         struct ib_wc *wc;
 309
 310         while ((nr = ib_poll_cq(cq, RDS_IB_WC_MAX, wcs)) > 0) {
 311                 for (i = 0; i < nr; i++) {
 312                         wc = wcs + i;
 313                         rdsdebug("wc wr_id 0x%llx status %u byte_len %u imm_data %u\n",
 314                                  (unsigned long long)wc->wr_id, wc->status,
 315                                  wc->byte_len, be32_to_cpu(wc->ex.imm_data));
 316
 317                         rds_ib_recv_cqe_handler(ic, wc, ack_state);
 318                 }
 319         }
 320 }
 321
 322 static void rds_ib_tasklet_fn_recv(unsigned long data)
 323 {
 324         struct rds_ib_connection *ic = (struct rds_ib_connection *)data;
 325         struct rds_connection *conn = ic->conn;
 326         struct rds_ib_device *rds_ibdev = ic->rds_ibdev;
 327         struct rds_ib_ack_state state;
 328
 329         if (!rds_ibdev)
 330                 rds_conn_drop(conn);
 331
 332         rds_ib_stats_inc(s_ib_tasklet_call);
 333
 334         /* if cq has been already reaped, ignore incoming cq event */
 335         if (atomic_read(&ic->i_cq_quiesce))
 336                 return;
 337
 338         memset(&state, 0, sizeof(state));
 339         poll_rcq(ic, ic->i_recv_cq, ic->i_recv_wc, &state);
 340         ib_req_notify_cq(ic->i_recv_cq, IB_CQ_SOLICITED);
 341         poll_rcq(ic, ic->i_recv_cq, ic->i_recv_wc, &state);
 342
 343         if (state.ack_next_valid)
 344                 rds_ib_set_ack(ic, state.ack_next, state.ack_required);
 345         if (state.ack_recv_valid && state.ack_recv > ic->i_ack_recv) {
 346                 rds_send_drop_acked(conn, state.ack_recv, NULL);
 347                 ic->i_ack_recv = state.ack_recv;
 348         }
 349
 350         if (rds_conn_up(conn))
 351                 rds_ib_attempt_ack(ic);
 352 }
 353
 354 static void rds_ib_qp_event_handler(struct ib_event *event, void *data)
 355 {
 356         struct rds_connection *conn = data;
 357         struct rds_ib_connection *ic = conn->c_transport_data;
 358
 359         rdsdebug("conn %p ic %p event %u (%s)\n", conn, ic, event->event,
 360                  ib_event_msg(event->event));
 361
 362         switch (event->event) {
 363         case IB_EVENT_COMM_EST:
 364                 rdma_notify(ic->i_cm_id, IB_EVENT_COMM_EST);
 365                 break;
 366         default:
 367                 rdsdebug("Fatal QP Event %u (%s) - connection %pI6c->%pI6c, reconnecting\n",
 368                          event->event, ib_event_msg(event->event),
 369                          &conn->c_laddr, &conn->c_faddr);
 370                 rds_conn_drop(conn);
 371                 break;
 372         }
 373 }
 374
 375 static void rds_ib_cq_comp_handler_send(struct ib_cq *cq, void *context)
 376 {
 377         struct rds_connection *conn = context;
 378         struct rds_ib_connection *ic = conn->c_transport_data;
 379
 380         rdsdebug("conn %p cq %p\n", conn, cq);
 381
 382         rds_ib_stats_inc(s_ib_evt_handler_call);
 383
 384         tasklet_schedule(&ic->i_send_tasklet);
 385 }
 386
 387 static inline int ibdev_get_unused_vector(struct rds_ib_device *rds_ibdev)
 388 {
 389         int min = rds_ibdev->vector_load[rds_ibdev->dev->num_comp_vectors - 1];
 390         int index = rds_ibdev->dev->num_comp_vectors - 1;
 391         int i;
 392
 393         for (i = rds_ibdev->dev->num_comp_vectors - 1; i >= 0; i--) {
 394                 if (rds_ibdev->vector_load[i] < min) {
 395                         index = i;
 396                         min = rds_ibdev->vector_load[i];
 397                 }
 398         }
 399
 400         rds_ibdev->vector_load[index]++;
 401         return index;
 402 }
 403
 404 static inline void ibdev_put_vector(struct rds_ib_device *rds_ibdev, int index)
 405 {
 406         rds_ibdev->vector_load[index]--;
 407 }
 408
 409 static void rds_dma_hdr_free(struct ib_device *dev, struct rds_header *hdr,
 410                 dma_addr_t dma_addr, enum dma_data_direction dir)
 411 {
 412         ib_dma_unmap_single(dev, dma_addr, sizeof(*hdr), dir);
 413         kfree(hdr);
 414 }
 415
 416 static struct rds_header *rds_dma_hdr_alloc(struct ib_device *dev,
 417                 dma_addr_t *dma_addr, enum dma_data_direction dir)
 418 {
 419         struct rds_header *hdr;
 420
 421         hdr = kzalloc_node(sizeof(*hdr), GFP_KERNEL, ibdev_to_node(dev));
 422         if (!hdr)
 423                 return NULL;
 424
 425         *dma_addr = ib_dma_map_single(dev, hdr, sizeof(*hdr),
 426                                       DMA_BIDIRECTIONAL);
 427         if (ib_dma_mapping_error(dev, *dma_addr)) {
 428                 kfree(hdr);
 429                 return NULL;
 430         }
 431
 432         return hdr;
 433 }
 434
 435 /* Free the DMA memory used to store struct rds_header.
 436  *
 437  * @dev: the RDS IB device
 438  * @hdrs: pointer to the array storing DMA memory pointers
 439  * @dma_addrs: pointer to the array storing DMA addresses
 440  * @num_hdars: number of headers to free.
 441  */
 442 static void rds_dma_hdrs_free(struct rds_ib_device *dev,
 443                 struct rds_header **hdrs, dma_addr_t *dma_addrs, u32 num_hdrs,
 444                 enum dma_data_direction dir)
 445 {
 446         u32 i;
 447
 448         for (i = 0; i < num_hdrs; i++)
 449                 rds_dma_hdr_free(dev->dev, hdrs[i], dma_addrs[i], dir);
 450         kvfree(hdrs);
 451         kvfree(dma_addrs);
 452 }
 453
 454
 455 /* Allocate DMA coherent memory to be used to store struct rds_header for
 456  * sending/receiving packets.  The pointers to the DMA memory and the
 457  * associated DMA addresses are stored in two arrays.
 458  *
 459  * @dev: the RDS IB device
 460  * @dma_addrs: pointer to the array for storing DMA addresses
 461  * @num_hdrs: number of headers to allocate
 462  *
 463  * It returns the pointer to the array storing the DMA memory pointers.  On
 464  * error, NULL pointer is returned.
 465  */
 466 static struct rds_header **rds_dma_hdrs_alloc(struct rds_ib_device *dev,
 467                 dma_addr_t **dma_addrs, u32 num_hdrs,
 468                 enum dma_data_direction dir)
 469 {
 470         struct rds_header **hdrs;
 471         dma_addr_t *hdr_daddrs;
 472         u32 i;
 473
 474         hdrs = kvmalloc_node(sizeof(*hdrs) * num_hdrs, GFP_KERNEL,
 475                              ibdev_to_node(dev->dev));
 476         if (!hdrs)
 477                 return NULL;
 478
 479         hdr_daddrs = kvmalloc_node(sizeof(*hdr_daddrs) * num_hdrs, GFP_KERNEL,
 480                                    ibdev_to_node(dev->dev));
 481         if (!hdr_daddrs) {
 482                 kvfree(hdrs);
 483                 return NULL;
 484         }
 485
 486         for (i = 0; i < num_hdrs; i++) {
 487                 hdrs[i] = rds_dma_hdr_alloc(dev->dev, &hdr_daddrs[i], dir);
 488                 if (!hdrs[i]) {
 489                         rds_dma_hdrs_free(dev, hdrs, hdr_daddrs, i, dir);
 490                         return NULL;
 491                 }
 492         }
 493
 494         *dma_addrs = hdr_daddrs;
 495         return hdrs;
 496 }
 497
 498 /*
 499  * This needs to be very careful to not leave IS_ERR pointers around for
 500  * cleanup to trip over.
 501  */
 502 static int rds_ib_setup_qp(struct rds_connection *conn)
 503 {
 504         struct rds_ib_connection *ic = conn->c_transport_data;
 505         struct ib_device *dev = ic->i_cm_id->device;
 506         struct ib_qp_init_attr attr;
 507         struct ib_cq_init_attr cq_attr = {};
 508         struct rds_ib_device *rds_ibdev;
 509         unsigned long max_wrs;
 510         int ret, fr_queue_space;
 511
 512         /*
 513          * It's normal to see a null device if an incoming connection races
 514          * with device removal, so we don't print a warning.
 515          */
 516         rds_ibdev = rds_ib_get_client_data(dev);
 517         if (!rds_ibdev)
 518                 return -EOPNOTSUPP;
 519
 520         /* The fr_queue_space is currently set to 512, to add extra space on
 521          * completion queue and send queue. This extra space is used for FRWR
 522          * registration and invalidation work requests
 523          */
 524         fr_queue_space = RDS_IB_DEFAULT_FR_WR;
 525
 526         /* add the conn now so that connection establishment has the dev */
 527         rds_ib_add_conn(rds_ibdev, conn);
 528
 529         max_wrs = rds_ibdev->max_wrs < rds_ib_sysctl_max_send_wr + 1 ?
 530                 rds_ibdev->max_wrs - 1 : rds_ib_sysctl_max_send_wr;
 531         if (ic->i_send_ring.w_nr != max_wrs)
 532                 rds_ib_ring_resize(&ic->i_send_ring, max_wrs);
 533
 534         max_wrs = rds_ibdev->max_wrs < rds_ib_sysctl_max_recv_wr + 1 ?
 535                 rds_ibdev->max_wrs - 1 : rds_ib_sysctl_max_recv_wr;
 536         if (ic->i_recv_ring.w_nr != max_wrs)
 537                 rds_ib_ring_resize(&ic->i_recv_ring, max_wrs);
 538
 539         /* Protection domain and memory range */
 540         ic->i_pd = rds_ibdev->pd;
 541
 542         ic->i_scq_vector = ibdev_get_unused_vector(rds_ibdev);
 543         cq_attr.cqe = ic->i_send_ring.w_nr + fr_queue_space + 1;
 544         cq_attr.comp_vector = ic->i_scq_vector;
 545         ic->i_send_cq = ib_create_cq(dev, rds_ib_cq_comp_handler_send,
 546                                      rds_ib_cq_event_handler, conn,
 547                                      &cq_attr);
 548         if (IS_ERR(ic->i_send_cq)) {
 549                 ret = PTR_ERR(ic->i_send_cq);
 550                 ic->i_send_cq = NULL;
 551                 ibdev_put_vector(rds_ibdev, ic->i_scq_vector);
 552                 rdsdebug("ib_create_cq send failed: %d\n", ret);
 553                 goto rds_ibdev_out;
 554         }
 555
 556         ic->i_rcq_vector = ibdev_get_unused_vector(rds_ibdev);
 557         cq_attr.cqe = ic->i_recv_ring.w_nr;
 558         cq_attr.comp_vector = ic->i_rcq_vector;
 559         ic->i_recv_cq = ib_create_cq(dev, rds_ib_cq_comp_handler_recv,
 560                                      rds_ib_cq_event_handler, conn,
 561                                      &cq_attr);
 562         if (IS_ERR(ic->i_recv_cq)) {
 563                 ret = PTR_ERR(ic->i_recv_cq);
 564                 ic->i_recv_cq = NULL;
 565                 ibdev_put_vector(rds_ibdev, ic->i_rcq_vector);
 566                 rdsdebug("ib_create_cq recv failed: %d\n", ret);
 567                 goto send_cq_out;
 568         }
 569
 570         ret = ib_req_notify_cq(ic->i_send_cq, IB_CQ_NEXT_COMP);
 571         if (ret) {
 572                 rdsdebug("ib_req_notify_cq send failed: %d\n", ret);
 573                 goto recv_cq_out;
 574         }
 575
 576         ret = ib_req_notify_cq(ic->i_recv_cq, IB_CQ_SOLICITED);
 577         if (ret) {
 578                 rdsdebug("ib_req_notify_cq recv failed: %d\n", ret);
 579                 goto recv_cq_out;
 580         }
 581
 582         /* XXX negotiate max send/recv with remote? */
 583         memset(&attr, 0, sizeof(attr));
 584         attr.event_handler = rds_ib_qp_event_handler;
 585         attr.qp_context = conn;
 586         /* + 1 to allow for the single ack message */
 587         attr.cap.max_send_wr = ic->i_send_ring.w_nr + fr_queue_space + 1;
 588         attr.cap.max_recv_wr = ic->i_recv_ring.w_nr + 1;
 589         attr.cap.max_send_sge = rds_ibdev->max_sge;
 590         attr.cap.max_recv_sge = RDS_IB_RECV_SGE;
 591         attr.sq_sig_type = IB_SIGNAL_REQ_WR;
 592         attr.qp_type = IB_QPT_RC;
 593         attr.send_cq = ic->i_send_cq;
 594         attr.recv_cq = ic->i_recv_cq;
 595
 596         /*
 597          * XXX this can fail if max_*_wr is too large?  Are we supposed
 598          * to back off until we get a value that the hardware can support?
 599          */
 600         ret = rdma_create_qp(ic->i_cm_id, ic->i_pd, &attr);
 601         if (ret) {
 602                 rdsdebug("rdma_create_qp failed: %d\n", ret);
 603                 goto recv_cq_out;
 604         }
 605
 606         ic->i_send_hdrs = rds_dma_hdrs_alloc(rds_ibdev, &ic->i_send_hdrs_dma,
 607                                              ic->i_send_ring.w_nr,
 608                                              DMA_TO_DEVICE);
 609         if (!ic->i_send_hdrs) {
 610                 ret = -ENOMEM;
 611                 rdsdebug("DMA send hdrs alloc failed\n");
 612                 goto qp_out;
 613         }
 614
 615         ic->i_recv_hdrs = rds_dma_hdrs_alloc(rds_ibdev, &ic->i_recv_hdrs_dma,
 616                                              ic->i_recv_ring.w_nr,
 617                                              DMA_FROM_DEVICE);
 618         if (!ic->i_recv_hdrs) {
 619                 ret = -ENOMEM;
 620                 rdsdebug("DMA recv hdrs alloc failed\n");
 621                 goto send_hdrs_dma_out;
 622         }
 623
 624         ic->i_ack = rds_dma_hdr_alloc(rds_ibdev->dev, &ic->i_ack_dma,
 625                                       DMA_TO_DEVICE);
 626         if (!ic->i_ack) {
 627                 ret = -ENOMEM;
 628                 rdsdebug("DMA ack header alloc failed\n");
 629                 goto recv_hdrs_dma_out;
 630         }
 631
 632         ic->i_sends = vzalloc_node(array_size(sizeof(struct rds_ib_send_work),
 633                                               ic->i_send_ring.w_nr),
 634                                    ibdev_to_node(dev));
 635         if (!ic->i_sends) {
 636                 ret = -ENOMEM;
 637                 rdsdebug("send allocation failed\n");
 638                 goto ack_dma_out;
 639         }
 640
 641         ic->i_recvs = vzalloc_node(array_size(sizeof(struct rds_ib_recv_work),
 642                                               ic->i_recv_ring.w_nr),
 643                                    ibdev_to_node(dev));
 644         if (!ic->i_recvs) {
 645                 ret = -ENOMEM;
 646                 rdsdebug("recv allocation failed\n");
 647                 goto sends_out;
 648         }
 649
 650         rds_ib_recv_init_ack(ic);
 651
 652         rdsdebug("conn %p pd %p cq %p %p\n", conn, ic->i_pd,
 653                  ic->i_send_cq, ic->i_recv_cq);
 654
 655         goto out;
 656
 657 sends_out:
 658         vfree(ic->i_sends);
 659
 660 ack_dma_out:
 661         rds_dma_hdr_free(rds_ibdev->dev, ic->i_ack, ic->i_ack_dma,
 662                          DMA_TO_DEVICE);
 663         ic->i_ack = NULL;
 664
 665 recv_hdrs_dma_out:
 666         rds_dma_hdrs_free(rds_ibdev, ic->i_recv_hdrs, ic->i_recv_hdrs_dma,
 667                           ic->i_recv_ring.w_nr, DMA_FROM_DEVICE);
 668         ic->i_recv_hdrs = NULL;
 669         ic->i_recv_hdrs_dma = NULL;
 670
 671 send_hdrs_dma_out:
 672         rds_dma_hdrs_free(rds_ibdev, ic->i_send_hdrs, ic->i_send_hdrs_dma,
 673                           ic->i_send_ring.w_nr, DMA_TO_DEVICE);
 674         ic->i_send_hdrs = NULL;
 675         ic->i_send_hdrs_dma = NULL;
 676
 677 qp_out:
 678         rdma_destroy_qp(ic->i_cm_id);
 679 recv_cq_out:
 680         ib_destroy_cq(ic->i_recv_cq);
 681         ic->i_recv_cq = NULL;
 682 send_cq_out:
 683         ib_destroy_cq(ic->i_send_cq);
 684         ic->i_send_cq = NULL;
 685 rds_ibdev_out:
 686         rds_ib_remove_conn(rds_ibdev, conn);
 687 out:
 688         rds_ib_dev_put(rds_ibdev);
 689
 690         return ret;
 691 }
 692
 693 static u32 rds_ib_protocol_compatible(struct rdma_cm_event *event, bool isv6)
 694 {
 695         const union rds_ib_conn_priv *dp = event->param.conn.private_data;
 696         u8 data_len, major, minor;
 697         u32 version = 0;
 698         __be16 mask;
 699         u16 common;
 700
 701         /*
 702          * rdma_cm private data is odd - when there is any private data in the
 703          * request, we will be given a pretty large buffer without telling us the
 704          * original size. The only way to tell the difference is by looking at
 705          * the contents, which are initialized to zero.
 706          * If the protocol version fields aren't set, this is a connection attempt
 707          * from an older version. This could be 3.0 or 2.0 - we can't tell.
 708          * We really should have changed this for OFED 1.3 :-(
 709          */
 710
 711         /* Be paranoid. RDS always has privdata */
 712         if (!event->param.conn.private_data_len) {
 713                 printk(KERN_NOTICE "RDS incoming connection has no private data, "
 714                         "rejecting\n");
 715                 return 0;
 716         }
 717
 718         if (isv6) {
 719                 data_len = sizeof(struct rds6_ib_connect_private);
 720                 major = dp->ricp_v6.dp_protocol_major;
 721                 minor = dp->ricp_v6.dp_protocol_minor;
 722                 mask = dp->ricp_v6.dp_protocol_minor_mask;
 723         } else {
 724                 data_len = sizeof(struct rds_ib_connect_private);
 725                 major = dp->ricp_v4.dp_protocol_major;
 726                 minor = dp->ricp_v4.dp_protocol_minor;
 727                 mask = dp->ricp_v4.dp_protocol_minor_mask;
 728         }
 729
 730         /* Even if len is crap *now* I still want to check it. -ASG */
 731         if (event->param.conn.private_data_len < data_len || major == 0)
 732                 return RDS_PROTOCOL_4_0;
 733
 734         common = be16_to_cpu(mask) & RDS_IB_SUPPORTED_PROTOCOLS;
 735         if (major == 4 && common) {
 736                 version = RDS_PROTOCOL_4_0;
 737                 while ((common >>= 1) != 0)
 738                         version++;
 739         } else if (RDS_PROTOCOL_COMPAT_VERSION ==
 740                    RDS_PROTOCOL(major, minor)) {
 741                 version = RDS_PROTOCOL_COMPAT_VERSION;
 742         } else {
 743                 if (isv6)
 744                         printk_ratelimited(KERN_NOTICE "RDS: Connection from %pI6c using incompatible protocol version %u.%u\n",
 745                                            &dp->ricp_v6.dp_saddr, major, minor);
 746                 else
 747                         printk_ratelimited(KERN_NOTICE "RDS: Connection from %pI4 using incompatible protocol version %u.%u\n",
 748                                            &dp->ricp_v4.dp_saddr, major, minor);
 749         }
 750         return version;
 751 }
 752
 753 #if IS_ENABLED(CONFIG_IPV6)
 754 /* Given an IPv6 address, find the net_device which hosts that address and
 755  * return its index.  This is used by the rds_ib_cm_handle_connect() code to
 756  * find the interface index of where an incoming request comes from when
 757  * the request is using a link local address.
 758  *
 759  * Note one problem in this search.  It is possible that two interfaces have
 760  * the same link local address.  Unfortunately, this cannot be solved unless
 761  * the underlying layer gives us the interface which an incoming RDMA connect
 762  * request comes from.
 763  */
 764 static u32 __rds_find_ifindex(struct net *net, const struct in6_addr *addr)
 765 {
 766         struct net_device *dev;
 767         int idx = 0;
 768
 769         rcu_read_lock();
 770         for_each_netdev_rcu(net, dev) {
 771                 if (ipv6_chk_addr(net, addr, dev, 1)) {
 772                         idx = dev->ifindex;
 773                         break;
 774                 }
 775         }
 776         rcu_read_unlock();
 777
 778         return idx;
 779 }
 780 #endif
 781
 782 int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id,
 783                              struct rdma_cm_event *event, bool isv6)
 784 {
 785         __be64 lguid = cm_id->route.path_rec->sgid.global.interface_id;
 786         __be64 fguid = cm_id->route.path_rec->dgid.global.interface_id;
 787         const struct rds_ib_conn_priv_cmn *dp_cmn;
 788         struct rds_connection *conn = NULL;
 789         struct rds_ib_connection *ic = NULL;
 790         struct rdma_conn_param conn_param;
 791         const union rds_ib_conn_priv *dp;
 792         union rds_ib_conn_priv dp_rep;
 793         struct in6_addr s_mapped_addr;
 794         struct in6_addr d_mapped_addr;
 795         const struct in6_addr *saddr6;
 796         const struct in6_addr *daddr6;
 797         int destroy = 1;
 798         u32 ifindex = 0;
 799         u32 version;
 800         int err = 1;
 801
 802         /* Check whether the remote protocol version matches ours. */
 803         version = rds_ib_protocol_compatible(event, isv6);
 804         if (!version) {
 805                 err = RDS_RDMA_REJ_INCOMPAT;
 806                 goto out;
 807         }
 808
 809         dp = event->param.conn.private_data;
 810         if (isv6) {
 811 #if IS_ENABLED(CONFIG_IPV6)
 812                 dp_cmn = &dp->ricp_v6.dp_cmn;
 813                 saddr6 = &dp->ricp_v6.dp_saddr;
 814                 daddr6 = &dp->ricp_v6.dp_daddr;
 815                 /* If either address is link local, need to find the
 816                  * interface index in order to create a proper RDS
 817                  * connection.
 818                  */
 819                 if (ipv6_addr_type(daddr6) & IPV6_ADDR_LINKLOCAL) {
 820                         /* Using init_net for now ..  */
 821                         ifindex = __rds_find_ifindex(&init_net, daddr6);
 822                         /* No index found...  Need to bail out. */
 823                         if (ifindex == 0) {
 824                                 err = -EOPNOTSUPP;
 825                                 goto out;
 826                         }
 827                 } else if (ipv6_addr_type(saddr6) & IPV6_ADDR_LINKLOCAL) {
 828                         /* Use our address to find the correct index. */
 829                         ifindex = __rds_find_ifindex(&init_net, daddr6);
 830                         /* No index found...  Need to bail out. */
 831                         if (ifindex == 0) {
 832                                 err = -EOPNOTSUPP;
 833                                 goto out;
 834                         }
 835                 }
 836 #else
 837                 err = -EOPNOTSUPP;
 838                 goto out;
 839 #endif
 840         } else {
 841                 dp_cmn = &dp->ricp_v4.dp_cmn;
 842                 ipv6_addr_set_v4mapped(dp->ricp_v4.dp_saddr, &s_mapped_addr);
 843                 ipv6_addr_set_v4mapped(dp->ricp_v4.dp_daddr, &d_mapped_addr);
 844                 saddr6 = &s_mapped_addr;
 845                 daddr6 = &d_mapped_addr;
 846         }
 847
 848         rdsdebug("saddr %pI6c daddr %pI6c RDSv%u.%u lguid 0x%llx fguid 0x%llx, tos:%d\n",
 849                  saddr6, daddr6, RDS_PROTOCOL_MAJOR(version),
 850                  RDS_PROTOCOL_MINOR(version),
 851                  (unsigned long long)be64_to_cpu(lguid),
 852                  (unsigned long long)be64_to_cpu(fguid), dp_cmn->ricpc_dp_toss);
 853
 854         /* RDS/IB is not currently netns aware, thus init_net */
 855         conn = rds_conn_create(&init_net, daddr6, saddr6,
 856                                &rds_ib_transport, dp_cmn->ricpc_dp_toss,
 857                                GFP_KERNEL, ifindex);
 858         if (IS_ERR(conn)) {
 859                 rdsdebug("rds_conn_create failed (%ld)\n", PTR_ERR(conn));
 860                 conn = NULL;
 861                 goto out;
 862         }
 863
 864         /*
 865          * The connection request may occur while the
 866          * previous connection exist, e.g. in case of failover.
 867          * But as connections may be initiated simultaneously
 868          * by both hosts, we have a random backoff mechanism -
 869          * see the comment above rds_queue_reconnect()
 870          */
 871         mutex_lock(&conn->c_cm_lock);
 872         if (!rds_conn_transition(conn, RDS_CONN_DOWN, RDS_CONN_CONNECTING)) {
 873                 if (rds_conn_state(conn) == RDS_CONN_UP) {
 874                         rdsdebug("incoming connect while connecting\n");
 875                         rds_conn_drop(conn);
 876                         rds_ib_stats_inc(s_ib_listen_closed_stale);
 877                 } else
 878                 if (rds_conn_state(conn) == RDS_CONN_CONNECTING) {
 879                         /* Wait and see - our connect may still be succeeding */
 880                         rds_ib_stats_inc(s_ib_connect_raced);
 881                 }
 882                 goto out;
 883         }
 884
 885         ic = conn->c_transport_data;
 886
 887         rds_ib_set_protocol(conn, version);
 888         rds_ib_set_flow_control(conn, be32_to_cpu(dp_cmn->ricpc_credit));
 889
 890         /* If the peer gave us the last packet it saw, process this as if
 891          * we had received a regular ACK. */
 892         if (dp_cmn->ricpc_ack_seq)
 893                 rds_send_drop_acked(conn, be64_to_cpu(dp_cmn->ricpc_ack_seq),
 894                                     NULL);
 895
 896         BUG_ON(cm_id->context);
 897         BUG_ON(ic->i_cm_id);
 898
 899         ic->i_cm_id = cm_id;
 900         cm_id->context = conn;
 901
 902         /* We got halfway through setting up the ib_connection, if we
 903          * fail now, we have to take the long route out of this mess. */
 904         destroy = 0;
 905
 906         err = rds_ib_setup_qp(conn);
 907         if (err) {
 908                 rds_ib_conn_error(conn, "rds_ib_setup_qp failed (%d)\n", err);
 909                 goto out;
 910         }
 911
 912         rds_ib_cm_fill_conn_param(conn, &conn_param, &dp_rep, version,
 913                                   event->param.conn.responder_resources,
 914                                   event->param.conn.initiator_depth, isv6);
 915
 916         rdma_set_min_rnr_timer(cm_id, IB_RNR_TIMER_000_32);
 917         /* rdma_accept() calls rdma_reject() internally if it fails */
 918         if (rdma_accept(cm_id, &conn_param))
 919                 rds_ib_conn_error(conn, "rdma_accept failed\n");
 920
 921 out:
 922         if (conn)
 923                 mutex_unlock(&conn->c_cm_lock);
 924         if (err)
 925                 rdma_reject(cm_id, &err, sizeof(int),
 926                             IB_CM_REJ_CONSUMER_DEFINED);
 927         return destroy;
 928 }
 929
 930
 931 int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id, bool isv6)
 932 {
 933         struct rds_connection *conn = cm_id->context;
 934         struct rds_ib_connection *ic = conn->c_transport_data;
 935         struct rdma_conn_param conn_param;
 936         union rds_ib_conn_priv dp;
 937         int ret;
 938
 939         /* If the peer doesn't do protocol negotiation, we must
 940          * default to RDSv3.0 */
 941         rds_ib_set_protocol(conn, RDS_PROTOCOL_4_1);
 942         ic->i_flowctl = rds_ib_sysctl_flow_control;     /* advertise flow control */
 943
 944         ret = rds_ib_setup_qp(conn);
 945         if (ret) {
 946                 rds_ib_conn_error(conn, "rds_ib_setup_qp failed (%d)\n", ret);
 947                 goto out;
 948         }
 949
 950         rds_ib_cm_fill_conn_param(conn, &conn_param, &dp,
 951                                   conn->c_proposed_version,
 952                                   UINT_MAX, UINT_MAX, isv6);
 953         ret = rdma_connect_locked(cm_id, &conn_param);
 954         if (ret)
 955                 rds_ib_conn_error(conn, "rdma_connect_locked failed (%d)\n",
 956                                   ret);
 957
 958 out:
 959         /* Beware - returning non-zero tells the rdma_cm to destroy
 960          * the cm_id. We should certainly not do it as long as we still
 961          * "own" the cm_id. */
 962         if (ret) {
 963                 if (ic->i_cm_id == cm_id)
 964                         ret = 0;
 965         }
 966         ic->i_active_side = true;
 967         return ret;
 968 }
 969
 970 int rds_ib_conn_path_connect(struct rds_conn_path *cp)
 971 {
 972         struct rds_connection *conn = cp->cp_conn;
 973         struct sockaddr_storage src, dest;
 974         rdma_cm_event_handler handler;
 975         struct rds_ib_connection *ic;
 976         int ret;
 977
 978         ic = conn->c_transport_data;
 979
 980         /* XXX I wonder what affect the port space has */
 981         /* delegate cm event handler to rdma_transport */
 982 #if IS_ENABLED(CONFIG_IPV6)
 983         if (conn->c_isv6)
 984                 handler = rds6_rdma_cm_event_handler;
 985         else
 986 #endif
 987                 handler = rds_rdma_cm_event_handler;
 988         ic->i_cm_id = rdma_create_id(&init_net, handler, conn,
 989                                      RDMA_PS_TCP, IB_QPT_RC);
 990         if (IS_ERR(ic->i_cm_id)) {
 991                 ret = PTR_ERR(ic->i_cm_id);
 992                 ic->i_cm_id = NULL;
 993                 rdsdebug("rdma_create_id() failed: %d\n", ret);
 994                 goto out;
 995         }
 996
 997         rdsdebug("created cm id %p for conn %p\n", ic->i_cm_id, conn);
 998
 999         if (ipv6_addr_v4mapped(&conn->c_faddr)) {
1000                 struct sockaddr_in *sin;
1001
1002                 sin = (struct sockaddr_in *)&src;
1003                 sin->sin_family = AF_INET;
1004                 sin->sin_addr.s_addr = conn->c_laddr.s6_addr32[3];
1005                 sin->sin_port = 0;
1006
1007                 sin = (struct sockaddr_in *)&dest;
1008                 sin->sin_family = AF_INET;
1009                 sin->sin_addr.s_addr = conn->c_faddr.s6_addr32[3];
1010                 sin->sin_port = htons(RDS_PORT);
1011         } else {
1012                 struct sockaddr_in6 *sin6;
1013
1014                 sin6 = (struct sockaddr_in6 *)&src;
1015                 sin6->sin6_family = AF_INET6;
1016                 sin6->sin6_addr = conn->c_laddr;
1017                 sin6->sin6_port = 0;
1018                 sin6->sin6_scope_id = conn->c_dev_if;
1019
1020                 sin6 = (struct sockaddr_in6 *)&dest;
1021                 sin6->sin6_family = AF_INET6;
1022                 sin6->sin6_addr = conn->c_faddr;
1023                 sin6->sin6_port = htons(RDS_CM_PORT);
1024                 sin6->sin6_scope_id = conn->c_dev_if;
1025         }
1026
1027         ret = rdma_resolve_addr(ic->i_cm_id, (struct sockaddr *)&src,
1028                                 (struct sockaddr *)&dest,
1029                                 RDS_RDMA_RESOLVE_TIMEOUT_MS);
1030         if (ret) {
1031                 rdsdebug("addr resolve failed for cm id %p: %d\n", ic->i_cm_id,
1032                          ret);
1033                 rdma_destroy_id(ic->i_cm_id);
1034                 ic->i_cm_id = NULL;
1035         }
1036
1037 out:
1038         return ret;
1039 }
1040
1041 /*
1042  * This is so careful about only cleaning up resources that were built up
1043  * so that it can be called at any point during startup.  In fact it
1044  * can be called multiple times for a given connection.
1045  */
1046 void rds_ib_conn_path_shutdown(struct rds_conn_path *cp)
1047 {
1048         struct rds_connection *conn = cp->cp_conn;
1049         struct rds_ib_connection *ic = conn->c_transport_data;
1050         int err = 0;
1051
1052         rdsdebug("cm %p pd %p cq %p %p qp %p\n", ic->i_cm_id,
1053                  ic->i_pd, ic->i_send_cq, ic->i_recv_cq,
1054                  ic->i_cm_id ? ic->i_cm_id->qp : NULL);
1055
1056         if (ic->i_cm_id) {
1057                 rdsdebug("disconnecting cm %p\n", ic->i_cm_id);
1058                 err = rdma_disconnect(ic->i_cm_id);
1059                 if (err) {
1060                         /* Actually this may happen quite frequently, when
1061                          * an outgoing connect raced with an incoming connect.
1062                          */
1063                         rdsdebug("failed to disconnect, cm: %p err %d\n",
1064                                 ic->i_cm_id, err);
1065                 }
1066
1067                 /* kick off "flush_worker" for all pools in order to reap
1068                  * all FRMR registrations that are still marked "FRMR_IS_INUSE"
1069                  */
1070                 rds_ib_flush_mrs();
1071
1072                 /*
1073                  * We want to wait for tx and rx completion to finish
1074                  * before we tear down the connection, but we have to be
1075                  * careful not to get stuck waiting on a send ring that
1076                  * only has unsignaled sends in it.  We've shutdown new
1077                  * sends before getting here so by waiting for signaled
1078                  * sends to complete we're ensured that there will be no
1079                  * more tx processing.
1080                  */
1081                 wait_event(rds_ib_ring_empty_wait,
1082                            rds_ib_ring_empty(&ic->i_recv_ring) &&
1083                            (atomic_read(&ic->i_signaled_sends) == 0) &&
1084                            (atomic_read(&ic->i_fastreg_inuse_count) == 0) &&
1085                            (atomic_read(&ic->i_fastreg_wrs) == RDS_IB_DEFAULT_FR_WR));
1086                 tasklet_kill(&ic->i_send_tasklet);
1087                 tasklet_kill(&ic->i_recv_tasklet);
1088
1089                 atomic_set(&ic->i_cq_quiesce, 1);
1090
1091                 /* first destroy the ib state that generates callbacks */
1092                 if (ic->i_cm_id->qp)
1093                         rdma_destroy_qp(ic->i_cm_id);
1094                 if (ic->i_send_cq) {
1095                         if (ic->rds_ibdev)
1096                                 ibdev_put_vector(ic->rds_ibdev, ic->i_scq_vector);
1097                         ib_destroy_cq(ic->i_send_cq);
1098                 }
1099
1100                 if (ic->i_recv_cq) {
1101                         if (ic->rds_ibdev)
1102                                 ibdev_put_vector(ic->rds_ibdev, ic->i_rcq_vector);
1103                         ib_destroy_cq(ic->i_recv_cq);
1104                 }
1105
1106                 if (ic->rds_ibdev) {
1107                         /* then free the resources that ib callbacks use */
1108                         if (ic->i_send_hdrs) {
1109                                 rds_dma_hdrs_free(ic->rds_ibdev,
1110                                                   ic->i_send_hdrs,
1111                                                   ic->i_send_hdrs_dma,
1112                                                   ic->i_send_ring.w_nr,
1113                                                   DMA_TO_DEVICE);
1114                                 ic->i_send_hdrs = NULL;
1115                                 ic->i_send_hdrs_dma = NULL;
1116                         }
1117
1118                         if (ic->i_recv_hdrs) {
1119                                 rds_dma_hdrs_free(ic->rds_ibdev,
1120                                                   ic->i_recv_hdrs,
1121                                                   ic->i_recv_hdrs_dma,
1122                                                   ic->i_recv_ring.w_nr,
1123                                                   DMA_FROM_DEVICE);
1124                                 ic->i_recv_hdrs = NULL;
1125                                 ic->i_recv_hdrs_dma = NULL;
1126                         }
1127
1128                         if (ic->i_ack) {
1129                                 rds_dma_hdr_free(ic->rds_ibdev->dev, ic->i_ack,
1130                                                  ic->i_ack_dma, DMA_TO_DEVICE);
1131                                 ic->i_ack = NULL;
1132                         }
1133                 } else {
1134                         WARN_ON(ic->i_send_hdrs);
1135                         WARN_ON(ic->i_send_hdrs_dma);
1136                         WARN_ON(ic->i_recv_hdrs);
1137                         WARN_ON(ic->i_recv_hdrs_dma);
1138                         WARN_ON(ic->i_ack);
1139                 }
1140
1141                 if (ic->i_sends)
1142                         rds_ib_send_clear_ring(ic);
1143                 if (ic->i_recvs)
1144                         rds_ib_recv_clear_ring(ic);
1145
1146                 rdma_destroy_id(ic->i_cm_id);
1147
1148                 /*
1149                  * Move connection back to the nodev list.
1150                  */
1151                 if (ic->rds_ibdev)
1152                         rds_ib_remove_conn(ic->rds_ibdev, conn);
1153
1154                 ic->i_cm_id = NULL;
1155                 ic->i_pd = NULL;
1156                 ic->i_send_cq = NULL;
1157                 ic->i_recv_cq = NULL;
1158         }
1159         BUG_ON(ic->rds_ibdev);
1160
1161         /* Clear pending transmit */
1162         if (ic->i_data_op) {
1163                 struct rds_message *rm;
1164
1165                 rm = container_of(ic->i_data_op, struct rds_message, data);
1166                 rds_message_put(rm);
1167                 ic->i_data_op = NULL;
1168         }
1169
1170         /* Clear the ACK state */
1171         clear_bit(IB_ACK_IN_FLIGHT, &ic->i_ack_flags);
1172 #ifdef KERNEL_HAS_ATOMIC64
1173         atomic64_set(&ic->i_ack_next, 0);
1174 #else
1175         ic->i_ack_next = 0;
1176 #endif
1177         ic->i_ack_recv = 0;
1178
1179         /* Clear flow control state */
1180         ic->i_flowctl = 0;
1181         atomic_set(&ic->i_credits, 0);
1182
1183         /* Re-init rings, but retain sizes. */
1184         rds_ib_ring_init(&ic->i_send_ring, ic->i_send_ring.w_nr);
1185         rds_ib_ring_init(&ic->i_recv_ring, ic->i_recv_ring.w_nr);
1186
1187         if (ic->i_ibinc) {
1188                 rds_inc_put(&ic->i_ibinc->ii_inc);
1189                 ic->i_ibinc = NULL;
1190         }
1191
1192         vfree(ic->i_sends);
1193         ic->i_sends = NULL;
1194         vfree(ic->i_recvs);
1195         ic->i_recvs = NULL;
1196         ic->i_active_side = false;
1197 }
1198
1199 int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp)
1200 {
1201         struct rds_ib_connection *ic;
1202         unsigned long flags;
1203         int ret;
1204
1205         /* XXX too lazy? */
1206         ic = kzalloc(sizeof(struct rds_ib_connection), gfp);
1207         if (!ic)
1208                 return -ENOMEM;
1209
1210         ret = rds_ib_recv_alloc_caches(ic, gfp);
1211         if (ret) {
1212                 kfree(ic);
1213                 return ret;
1214         }
1215
1216         INIT_LIST_HEAD(&ic->ib_node);
1217         tasklet_init(&ic->i_send_tasklet, rds_ib_tasklet_fn_send,
1218                      (unsigned long)ic);
1219         tasklet_init(&ic->i_recv_tasklet, rds_ib_tasklet_fn_recv,
1220                      (unsigned long)ic);
1221         mutex_init(&ic->i_recv_mutex);
1222 #ifndef KERNEL_HAS_ATOMIC64
1223         spin_lock_init(&ic->i_ack_lock);
1224 #endif
1225         atomic_set(&ic->i_signaled_sends, 0);
1226         atomic_set(&ic->i_fastreg_wrs, RDS_IB_DEFAULT_FR_WR);
1227
1228         /*
1229          * rds_ib_conn_shutdown() waits for these to be emptied so they
1230          * must be initialized before it can be called.
1231          */
1232         rds_ib_ring_init(&ic->i_send_ring, 0);
1233         rds_ib_ring_init(&ic->i_recv_ring, 0);
1234
1235         ic->conn = conn;
1236         conn->c_transport_data = ic;
1237
1238         spin_lock_irqsave(&ib_nodev_conns_lock, flags);
1239         list_add_tail(&ic->ib_node, &ib_nodev_conns);
1240         spin_unlock_irqrestore(&ib_nodev_conns_lock, flags);
1241
1242
1243         rdsdebug("conn %p conn ic %p\n", conn, conn->c_transport_data);
1244         return 0;
1245 }
1246
1247 /*
1248  * Free a connection. Connection must be shut down and not set for reconnect.
1249  */
1250 void rds_ib_conn_free(void *arg)
1251 {
1252         struct rds_ib_connection *ic = arg;
1253         spinlock_t      *lock_ptr;
1254
1255         rdsdebug("ic %p\n", ic);
1256
1257         /*
1258          * Conn is either on a dev's list or on the nodev list.
1259          * A race with shutdown() or connect() would cause problems
1260          * (since rds_ibdev would change) but that should never happen.
1261          */
1262         lock_ptr = ic->rds_ibdev ? &ic->rds_ibdev->spinlock : &ib_nodev_conns_lock;
1263
1264         spin_lock_irq(lock_ptr);
1265         list_del(&ic->ib_node);
1266         spin_unlock_irq(lock_ptr);
1267
1268         rds_ib_recv_free_caches(ic);
1269
1270         kfree(ic);
1271 }
1272
1273
1274 /*
1275  * An error occurred on the connection
1276  */
1277 void
1278 __rds_ib_conn_error(struct rds_connection *conn, const char *fmt, ...)
1279 {
1280         va_list ap;
1281
1282         rds_conn_drop(conn);
1283
1284         va_start(ap, fmt);
1285         vprintk(fmt, ap);
1286         va_end(ap);
1287 }