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/dmapool.h>
  34 #include <linux/kernel.h>
  35 #include <linux/in.h>
  36 #include <linux/slab.h>
  37 #include <linux/vmalloc.h>
  38 #include <linux/ratelimit.h>
  39 #include <net/addrconf.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  * Tune RNR behavior. Without flow control, we use a rather
  72  * low timeout, but not the absolute minimum - this should
  73  * be tunable.
  74  *
  75  * We already set the RNR retry count to 7 (which is the
  76  * smallest infinite number :-) above.
  77  * If flow control is off, we want to change this back to 0
  78  * so that we learn quickly when our credit accounting is
  79  * buggy.
  80  *
  81  * Caller passes in a qp_attr pointer - don't waste stack spacv
  82  * by allocation this twice.
  83  */
  84 static void
  85 rds_ib_tune_rnr(struct rds_ib_connection *ic, struct ib_qp_attr *attr)
  86 {
  87         int ret;
  88
  89         attr->min_rnr_timer = IB_RNR_TIMER_000_32;
  90         ret = ib_modify_qp(ic->i_cm_id->qp, attr, IB_QP_MIN_RNR_TIMER);
  91         if (ret)
  92                 printk(KERN_NOTICE "ib_modify_qp(IB_QP_MIN_RNR_TIMER): err=%d\n", -ret);
  93 }
  94
  95 /*
  96  * Connection established.
  97  * We get here for both outgoing and incoming connection.
  98  */
  99 void rds_ib_cm_connect_complete(struct rds_connection *conn, struct rdma_cm_event *event)
 100 {
 101         struct rds_ib_connection *ic = conn->c_transport_data;
 102         const union rds_ib_conn_priv *dp = NULL;
 103         struct ib_qp_attr qp_attr;
 104         __be64 ack_seq = 0;
 105         __be32 credit = 0;
 106         u8 major = 0;
 107         u8 minor = 0;
 108         int err;
 109
 110         dp = event->param.conn.private_data;
 111         if (conn->c_isv6) {
 112                 if (event->param.conn.private_data_len >=
 113                     sizeof(struct rds6_ib_connect_private)) {
 114                         major = dp->ricp_v6.dp_protocol_major;
 115                         minor = dp->ricp_v6.dp_protocol_minor;
 116                         credit = dp->ricp_v6.dp_credit;
 117                         /* dp structure start is not guaranteed to be 8 bytes
 118                          * aligned.  Since dp_ack_seq is 64-bit extended load
 119                          * operations can be used so go through get_unaligned
 120                          * to avoid unaligned errors.
 121                          */
 122                         ack_seq = get_unaligned(&dp->ricp_v6.dp_ack_seq);
 123                 }
 124         } else if (event->param.conn.private_data_len >=
 125                    sizeof(struct rds_ib_connect_private)) {
 126                 major = dp->ricp_v4.dp_protocol_major;
 127                 minor = dp->ricp_v4.dp_protocol_minor;
 128                 credit = dp->ricp_v4.dp_credit;
 129                 ack_seq = get_unaligned(&dp->ricp_v4.dp_ack_seq);
 130         }
 131
 132         /* make sure it isn't empty data */
 133         if (major) {
 134                 rds_ib_set_protocol(conn, RDS_PROTOCOL(major, minor));
 135                 rds_ib_set_flow_control(conn, be32_to_cpu(credit));
 136         }
 137
 138         if (conn->c_version < RDS_PROTOCOL_VERSION) {
 139                 if (conn->c_version != RDS_PROTOCOL_COMPAT_VERSION) {
 140                         pr_notice("RDS/IB: Connection <%pI6c,%pI6c> version %u.%u no longer supported\n",
 141                                   &conn->c_laddr, &conn->c_faddr,
 142                                   RDS_PROTOCOL_MAJOR(conn->c_version),
 143                                   RDS_PROTOCOL_MINOR(conn->c_version));
 144                         rds_conn_destroy(conn);
 145                         return;
 146                 }
 147         }
 148
 149         pr_notice("RDS/IB: %s conn connected <%pI6c,%pI6c,%d> version %u.%u%s\n",
 150                   ic->i_active_side ? "Active" : "Passive",
 151                   &conn->c_laddr, &conn->c_faddr, conn->c_tos,
 152                   RDS_PROTOCOL_MAJOR(conn->c_version),
 153                   RDS_PROTOCOL_MINOR(conn->c_version),
 154                   ic->i_flowctl ? ", flow control" : "");
 155
 156         /* receive sl from the peer */
 157         ic->i_sl = ic->i_cm_id->route.path_rec->sl;
 158
 159         atomic_set(&ic->i_cq_quiesce, 0);
 160
 161         /* Init rings and fill recv. this needs to wait until protocol
 162          * negotiation is complete, since ring layout is different
 163          * from 3.1 to 4.1.
 164          */
 165         rds_ib_send_init_ring(ic);
 166         rds_ib_recv_init_ring(ic);
 167         /* Post receive buffers - as a side effect, this will update
 168          * the posted credit count. */
 169         rds_ib_recv_refill(conn, 1, GFP_KERNEL);
 170
 171         /* Tune RNR behavior */
 172         rds_ib_tune_rnr(ic, &qp_attr);
 173
 174         qp_attr.qp_state = IB_QPS_RTS;
 175         err = ib_modify_qp(ic->i_cm_id->qp, &qp_attr, IB_QP_STATE);
 176         if (err)
 177                 printk(KERN_NOTICE "ib_modify_qp(IB_QP_STATE, RTS): err=%d\n", err);
 178
 179         /* update ib_device with this local ipaddr */
 180         err = rds_ib_update_ipaddr(ic->rds_ibdev, &conn->c_laddr);
 181         if (err)
 182                 printk(KERN_ERR "rds_ib_update_ipaddr failed (%d)\n",
 183                         err);
 184
 185         /* If the peer gave us the last packet it saw, process this as if
 186          * we had received a regular ACK. */
 187         if (dp) {
 188                 if (ack_seq)
 189                         rds_send_drop_acked(conn, be64_to_cpu(ack_seq),
 190                                             NULL);
 191         }
 192
 193         conn->c_proposed_version = conn->c_version;
 194         rds_connect_complete(conn);
 195 }
 196
 197 static void rds_ib_cm_fill_conn_param(struct rds_connection *conn,
 198                                       struct rdma_conn_param *conn_param,
 199                                       union rds_ib_conn_priv *dp,
 200                                       u32 protocol_version,
 201                                       u32 max_responder_resources,
 202                                       u32 max_initiator_depth,
 203                                       bool isv6)
 204 {
 205         struct rds_ib_connection *ic = conn->c_transport_data;
 206         struct rds_ib_device *rds_ibdev = ic->rds_ibdev;
 207
 208         memset(conn_param, 0, sizeof(struct rdma_conn_param));
 209
 210         conn_param->responder_resources =
 211                 min_t(u32, rds_ibdev->max_responder_resources, max_responder_resources);
 212         conn_param->initiator_depth =
 213                 min_t(u32, rds_ibdev->max_initiator_depth, max_initiator_depth);
 214         conn_param->retry_count = min_t(unsigned int, rds_ib_retry_count, 7);
 215         conn_param->rnr_retry_count = 7;
 216
 217         if (dp) {
 218                 memset(dp, 0, sizeof(*dp));
 219                 if (isv6) {
 220                         dp->ricp_v6.dp_saddr = conn->c_laddr;
 221                         dp->ricp_v6.dp_daddr = conn->c_faddr;
 222                         dp->ricp_v6.dp_protocol_major =
 223                             RDS_PROTOCOL_MAJOR(protocol_version);
 224                         dp->ricp_v6.dp_protocol_minor =
 225                             RDS_PROTOCOL_MINOR(protocol_version);
 226                         dp->ricp_v6.dp_protocol_minor_mask =
 227                             cpu_to_be16(RDS_IB_SUPPORTED_PROTOCOLS);
 228                         dp->ricp_v6.dp_ack_seq =
 229                             cpu_to_be64(rds_ib_piggyb_ack(ic));
 230                         dp->ricp_v6.dp_cmn.ricpc_dp_toss = conn->c_tos;
 231
 232                         conn_param->private_data = &dp->ricp_v6;
 233                         conn_param->private_data_len = sizeof(dp->ricp_v6);
 234                 } else {
 235                         dp->ricp_v4.dp_saddr = conn->c_laddr.s6_addr32[3];
 236                         dp->ricp_v4.dp_daddr = conn->c_faddr.s6_addr32[3];
 237                         dp->ricp_v4.dp_protocol_major =
 238                             RDS_PROTOCOL_MAJOR(protocol_version);
 239                         dp->ricp_v4.dp_protocol_minor =
 240                             RDS_PROTOCOL_MINOR(protocol_version);
 241                         dp->ricp_v4.dp_protocol_minor_mask =
 242                             cpu_to_be16(RDS_IB_SUPPORTED_PROTOCOLS);
 243                         dp->ricp_v4.dp_ack_seq =
 244                             cpu_to_be64(rds_ib_piggyb_ack(ic));
 245                         dp->ricp_v4.dp_cmn.ricpc_dp_toss = conn->c_tos;
 246
 247                         conn_param->private_data = &dp->ricp_v4;
 248                         conn_param->private_data_len = sizeof(dp->ricp_v4);
 249                 }
 250
 251                 /* Advertise flow control */
 252                 if (ic->i_flowctl) {
 253                         unsigned int credits;
 254
 255                         credits = IB_GET_POST_CREDITS
 256                                 (atomic_read(&ic->i_credits));
 257                         if (isv6)
 258                                 dp->ricp_v6.dp_credit = cpu_to_be32(credits);
 259                         else
 260                                 dp->ricp_v4.dp_credit = cpu_to_be32(credits);
 261                         atomic_sub(IB_SET_POST_CREDITS(credits),
 262                                    &ic->i_credits);
 263                 }
 264         }
 265 }
 266
 267 static void rds_ib_cq_event_handler(struct ib_event *event, void *data)
 268 {
 269         rdsdebug("event %u (%s) data %p\n",
 270                  event->event, ib_event_msg(event->event), data);
 271 }
 272
 273 /* Plucking the oldest entry from the ring can be done concurrently with
 274  * the thread refilling the ring.  Each ring operation is protected by
 275  * spinlocks and the transient state of refilling doesn't change the
 276  * recording of which entry is oldest.
 277  *
 278  * This relies on IB only calling one cq comp_handler for each cq so that
 279  * there will only be one caller of rds_recv_incoming() per RDS connection.
 280  */
 281 static void rds_ib_cq_comp_handler_recv(struct ib_cq *cq, void *context)
 282 {
 283         struct rds_connection *conn = context;
 284         struct rds_ib_connection *ic = conn->c_transport_data;
 285
 286         rdsdebug("conn %p cq %p\n", conn, cq);
 287
 288         rds_ib_stats_inc(s_ib_evt_handler_call);
 289
 290         tasklet_schedule(&ic->i_recv_tasklet);
 291 }
 292
 293 static void poll_scq(struct rds_ib_connection *ic, struct ib_cq *cq,
 294                      struct ib_wc *wcs)
 295 {
 296         int nr, i;
 297         struct ib_wc *wc;
 298
 299         while ((nr = ib_poll_cq(cq, RDS_IB_WC_MAX, wcs)) > 0) {
 300                 for (i = 0; i < nr; i++) {
 301                         wc = wcs + i;
 302                         rdsdebug("wc wr_id 0x%llx status %u byte_len %u imm_data %u\n",
 303                                  (unsigned long long)wc->wr_id, wc->status,
 304                                  wc->byte_len, be32_to_cpu(wc->ex.imm_data));
 305
 306                         if (wc->wr_id <= ic->i_send_ring.w_nr ||
 307                             wc->wr_id == RDS_IB_ACK_WR_ID)
 308                                 rds_ib_send_cqe_handler(ic, wc);
 309                         else
 310                                 rds_ib_mr_cqe_handler(ic, wc);
 311
 312                 }
 313         }
 314 }
 315
 316 static void rds_ib_tasklet_fn_send(unsigned long data)
 317 {
 318         struct rds_ib_connection *ic = (struct rds_ib_connection *)data;
 319         struct rds_connection *conn = ic->conn;
 320
 321         rds_ib_stats_inc(s_ib_tasklet_call);
 322
 323         /* if cq has been already reaped, ignore incoming cq event */
 324         if (atomic_read(&ic->i_cq_quiesce))
 325                 return;
 326
 327         poll_scq(ic, ic->i_send_cq, ic->i_send_wc);
 328         ib_req_notify_cq(ic->i_send_cq, IB_CQ_NEXT_COMP);
 329         poll_scq(ic, ic->i_send_cq, ic->i_send_wc);
 330
 331         if (rds_conn_up(conn) &&
 332             (!test_bit(RDS_LL_SEND_FULL, &conn->c_flags) ||
 333             test_bit(0, &conn->c_map_queued)))
 334                 rds_send_xmit(&ic->conn->c_path[0]);
 335 }
 336
 337 static void poll_rcq(struct rds_ib_connection *ic, struct ib_cq *cq,
 338                      struct ib_wc *wcs,
 339                      struct rds_ib_ack_state *ack_state)
 340 {
 341         int nr, i;
 342         struct ib_wc *wc;
 343
 344         while ((nr = ib_poll_cq(cq, RDS_IB_WC_MAX, wcs)) > 0) {
 345                 for (i = 0; i < nr; i++) {
 346                         wc = wcs + i;
 347                         rdsdebug("wc wr_id 0x%llx status %u byte_len %u imm_data %u\n",
 348                                  (unsigned long long)wc->wr_id, wc->status,
 349                                  wc->byte_len, be32_to_cpu(wc->ex.imm_data));
 350
 351                         rds_ib_recv_cqe_handler(ic, wc, ack_state);
 352                 }
 353         }
 354 }
 355
 356 static void rds_ib_tasklet_fn_recv(unsigned long data)
 357 {
 358         struct rds_ib_connection *ic = (struct rds_ib_connection *)data;
 359         struct rds_connection *conn = ic->conn;
 360         struct rds_ib_device *rds_ibdev = ic->rds_ibdev;
 361         struct rds_ib_ack_state state;
 362
 363         if (!rds_ibdev)
 364                 rds_conn_drop(conn);
 365
 366         rds_ib_stats_inc(s_ib_tasklet_call);
 367
 368         /* if cq has been already reaped, ignore incoming cq event */
 369         if (atomic_read(&ic->i_cq_quiesce))
 370                 return;
 371
 372         memset(&state, 0, sizeof(state));
 373         poll_rcq(ic, ic->i_recv_cq, ic->i_recv_wc, &state);
 374         ib_req_notify_cq(ic->i_recv_cq, IB_CQ_SOLICITED);
 375         poll_rcq(ic, ic->i_recv_cq, ic->i_recv_wc, &state);
 376
 377         if (state.ack_next_valid)
 378                 rds_ib_set_ack(ic, state.ack_next, state.ack_required);
 379         if (state.ack_recv_valid && state.ack_recv > ic->i_ack_recv) {
 380                 rds_send_drop_acked(conn, state.ack_recv, NULL);
 381                 ic->i_ack_recv = state.ack_recv;
 382         }
 383
 384         if (rds_conn_up(conn))
 385                 rds_ib_attempt_ack(ic);
 386 }
 387
 388 static void rds_ib_qp_event_handler(struct ib_event *event, void *data)
 389 {
 390         struct rds_connection *conn = data;
 391         struct rds_ib_connection *ic = conn->c_transport_data;
 392
 393         rdsdebug("conn %p ic %p event %u (%s)\n", conn, ic, event->event,
 394                  ib_event_msg(event->event));
 395
 396         switch (event->event) {
 397         case IB_EVENT_COMM_EST:
 398                 rdma_notify(ic->i_cm_id, IB_EVENT_COMM_EST);
 399                 break;
 400         default:
 401                 rdsdebug("Fatal QP Event %u (%s) - connection %pI6c->%pI6c, reconnecting\n",
 402                          event->event, ib_event_msg(event->event),
 403                          &conn->c_laddr, &conn->c_faddr);
 404                 rds_conn_drop(conn);
 405                 break;
 406         }
 407 }
 408
 409 static void rds_ib_cq_comp_handler_send(struct ib_cq *cq, void *context)
 410 {
 411         struct rds_connection *conn = context;
 412         struct rds_ib_connection *ic = conn->c_transport_data;
 413
 414         rdsdebug("conn %p cq %p\n", conn, cq);
 415
 416         rds_ib_stats_inc(s_ib_evt_handler_call);
 417
 418         tasklet_schedule(&ic->i_send_tasklet);
 419 }
 420
 421 static inline int ibdev_get_unused_vector(struct rds_ib_device *rds_ibdev)
 422 {
 423         int min = rds_ibdev->vector_load[rds_ibdev->dev->num_comp_vectors - 1];
 424         int index = rds_ibdev->dev->num_comp_vectors - 1;
 425         int i;
 426
 427         for (i = rds_ibdev->dev->num_comp_vectors - 1; i >= 0; i--) {
 428                 if (rds_ibdev->vector_load[i] < min) {
 429                         index = i;
 430                         min = rds_ibdev->vector_load[i];
 431                 }
 432         }
 433
 434         rds_ibdev->vector_load[index]++;
 435         return index;
 436 }
 437
 438 static inline void ibdev_put_vector(struct rds_ib_device *rds_ibdev, int index)
 439 {
 440         rds_ibdev->vector_load[index]--;
 441 }
 442
 443 /* Allocate DMA coherent memory to be used to store struct rds_header for
 444  * sending/receiving packets.  The pointers to the DMA memory and the
 445  * associated DMA addresses are stored in two arrays.
 446  *
 447  * @ibdev: the IB device
 448  * @pool: the DMA memory pool
 449  * @dma_addrs: pointer to the array for storing DMA addresses
 450  * @num_hdrs: number of headers to allocate
 451  *
 452  * It returns the pointer to the array storing the DMA memory pointers.  On
 453  * error, NULL pointer is returned.
 454  */
 455 struct rds_header **rds_dma_hdrs_alloc(struct ib_device *ibdev,
 456                                        struct dma_pool *pool,
 457                                        dma_addr_t **dma_addrs, u32 num_hdrs)
 458 {
 459         struct rds_header **hdrs;
 460         dma_addr_t *hdr_daddrs;
 461         u32 i;
 462
 463         hdrs = kvmalloc_node(sizeof(*hdrs) * num_hdrs, GFP_KERNEL,
 464                              ibdev_to_node(ibdev));
 465         if (!hdrs)
 466                 return NULL;
 467
 468         hdr_daddrs = kvmalloc_node(sizeof(*hdr_daddrs) * num_hdrs, GFP_KERNEL,
 469                                    ibdev_to_node(ibdev));
 470         if (!hdr_daddrs) {
 471                 kvfree(hdrs);
 472                 return NULL;
 473         }
 474
 475         for (i = 0; i < num_hdrs; i++) {
 476                 hdrs[i] = dma_pool_zalloc(pool, GFP_KERNEL, &hdr_daddrs[i]);
 477                 if (!hdrs[i]) {
 478                         rds_dma_hdrs_free(pool, hdrs, hdr_daddrs, i);
 479                         return NULL;
 480                 }
 481         }
 482
 483         *dma_addrs = hdr_daddrs;
 484         return hdrs;
 485 }
 486
 487 /* Free the DMA memory used to store struct rds_header.
 488  *
 489  * @pool: the DMA memory pool
 490  * @hdrs: pointer to the array storing DMA memory pointers
 491  * @dma_addrs: pointer to the array storing DMA addresses
 492  * @num_hdars: number of headers to free.
 493  */
 494 void rds_dma_hdrs_free(struct dma_pool *pool, struct rds_header **hdrs,
 495                        dma_addr_t *dma_addrs, u32 num_hdrs)
 496 {
 497         u32 i;
 498
 499         for (i = 0; i < num_hdrs; i++)
 500                 dma_pool_free(pool, hdrs[i], dma_addrs[i]);
 501         kvfree(hdrs);
 502         kvfree(dma_addrs);
 503 }
 504
 505 /*
 506  * This needs to be very careful to not leave IS_ERR pointers around for
 507  * cleanup to trip over.
 508  */
 509 static int rds_ib_setup_qp(struct rds_connection *conn)
 510 {
 511         struct rds_ib_connection *ic = conn->c_transport_data;
 512         struct ib_device *dev = ic->i_cm_id->device;
 513         struct ib_qp_init_attr attr;
 514         struct ib_cq_init_attr cq_attr = {};
 515         struct rds_ib_device *rds_ibdev;
 516         int ret, fr_queue_space;
 517         struct dma_pool *pool;
 518
 519         /*
 520          * It's normal to see a null device if an incoming connection races
 521          * with device removal, so we don't print a warning.
 522          */
 523         rds_ibdev = rds_ib_get_client_data(dev);
 524         if (!rds_ibdev)
 525                 return -EOPNOTSUPP;
 526
 527         /* The fr_queue_space is currently set to 512, to add extra space on
 528          * completion queue and send queue. This extra space is used for FRMR
 529          * registration and invalidation work requests
 530          */
 531         fr_queue_space = (rds_ibdev->use_fastreg ? RDS_IB_DEFAULT_FR_WR : 0);
 532
 533         /* add the conn now so that connection establishment has the dev */
 534         rds_ib_add_conn(rds_ibdev, conn);
 535
 536         if (rds_ibdev->max_wrs < ic->i_send_ring.w_nr + 1)
 537                 rds_ib_ring_resize(&ic->i_send_ring, rds_ibdev->max_wrs - 1);
 538         if (rds_ibdev->max_wrs < ic->i_recv_ring.w_nr + 1)
 539                 rds_ib_ring_resize(&ic->i_recv_ring, rds_ibdev->max_wrs - 1);
 540
 541         /* Protection domain and memory range */
 542         ic->i_pd = rds_ibdev->pd;
 543
 544         ic->i_scq_vector = ibdev_get_unused_vector(rds_ibdev);
 545         cq_attr.cqe = ic->i_send_ring.w_nr + fr_queue_space + 1;
 546         cq_attr.comp_vector = ic->i_scq_vector;
 547         ic->i_send_cq = ib_create_cq(dev, rds_ib_cq_comp_handler_send,
 548                                      rds_ib_cq_event_handler, conn,
 549                                      &cq_attr);
 550         if (IS_ERR(ic->i_send_cq)) {
 551                 ret = PTR_ERR(ic->i_send_cq);
 552                 ic->i_send_cq = NULL;
 553                 ibdev_put_vector(rds_ibdev, ic->i_scq_vector);
 554                 rdsdebug("ib_create_cq send failed: %d\n", ret);
 555                 goto rds_ibdev_out;
 556         }
 557
 558         ic->i_rcq_vector = ibdev_get_unused_vector(rds_ibdev);
 559         cq_attr.cqe = ic->i_recv_ring.w_nr;
 560         cq_attr.comp_vector = ic->i_rcq_vector;
 561         ic->i_recv_cq = ib_create_cq(dev, rds_ib_cq_comp_handler_recv,
 562                                      rds_ib_cq_event_handler, conn,
 563                                      &cq_attr);
 564         if (IS_ERR(ic->i_recv_cq)) {
 565                 ret = PTR_ERR(ic->i_recv_cq);
 566                 ic->i_recv_cq = NULL;
 567                 ibdev_put_vector(rds_ibdev, ic->i_rcq_vector);
 568                 rdsdebug("ib_create_cq recv failed: %d\n", ret);
 569                 goto send_cq_out;
 570         }
 571
 572         ret = ib_req_notify_cq(ic->i_send_cq, IB_CQ_NEXT_COMP);
 573         if (ret) {
 574                 rdsdebug("ib_req_notify_cq send failed: %d\n", ret);
 575                 goto recv_cq_out;
 576         }
 577
 578         ret = ib_req_notify_cq(ic->i_recv_cq, IB_CQ_SOLICITED);
 579         if (ret) {
 580                 rdsdebug("ib_req_notify_cq recv failed: %d\n", ret);
 581                 goto recv_cq_out;
 582         }
 583
 584         /* XXX negotiate max send/recv with remote? */
 585         memset(&attr, 0, sizeof(attr));
 586         attr.event_handler = rds_ib_qp_event_handler;
 587         attr.qp_context = conn;
 588         /* + 1 to allow for the single ack message */
 589         attr.cap.max_send_wr = ic->i_send_ring.w_nr + fr_queue_space + 1;
 590         attr.cap.max_recv_wr = ic->i_recv_ring.w_nr + 1;
 591         attr.cap.max_send_sge = rds_ibdev->max_sge;
 592         attr.cap.max_recv_sge = RDS_IB_RECV_SGE;
 593         attr.sq_sig_type = IB_SIGNAL_REQ_WR;
 594         attr.qp_type = IB_QPT_RC;
 595         attr.send_cq = ic->i_send_cq;
 596         attr.recv_cq = ic->i_recv_cq;
 597
 598         /*
 599          * XXX this can fail if max_*_wr is too large?  Are we supposed
 600          * to back off until we get a value that the hardware can support?
 601          */
 602         ret = rdma_create_qp(ic->i_cm_id, ic->i_pd, &attr);
 603         if (ret) {
 604                 rdsdebug("rdma_create_qp failed: %d\n", ret);
 605                 goto recv_cq_out;
 606         }
 607
 608         pool = rds_ibdev->rid_hdrs_pool;
 609         ic->i_send_hdrs = rds_dma_hdrs_alloc(dev, pool, &ic->i_send_hdrs_dma,
 610                                              ic->i_send_ring.w_nr);
 611         if (!ic->i_send_hdrs) {
 612                 ret = -ENOMEM;
 613                 rdsdebug("DMA send hdrs alloc failed\n");
 614                 goto qp_out;
 615         }
 616
 617         ic->i_recv_hdrs = rds_dma_hdrs_alloc(dev, pool, &ic->i_recv_hdrs_dma,
 618                                              ic->i_recv_ring.w_nr);
 619         if (!ic->i_recv_hdrs) {
 620                 ret = -ENOMEM;
 621                 rdsdebug("DMA recv hdrs alloc failed\n");
 622                 goto send_hdrs_dma_out;
 623         }
 624
 625         ic->i_ack = dma_pool_zalloc(pool, GFP_KERNEL,
 626                                     &ic->i_ack_dma);
 627         if (!ic->i_ack) {
 628                 ret = -ENOMEM;
 629                 rdsdebug("DMA ack header alloc failed\n");
 630                 goto recv_hdrs_dma_out;
 631         }
 632
 633         ic->i_sends = vzalloc_node(array_size(sizeof(struct rds_ib_send_work),
 634                                               ic->i_send_ring.w_nr),
 635                                    ibdev_to_node(dev));
 636         if (!ic->i_sends) {
 637                 ret = -ENOMEM;
 638                 rdsdebug("send allocation failed\n");
 639                 goto ack_dma_out;
 640         }
 641
 642         ic->i_recvs = vzalloc_node(array_size(sizeof(struct rds_ib_recv_work),
 643                                               ic->i_recv_ring.w_nr),
 644                                    ibdev_to_node(dev));
 645         if (!ic->i_recvs) {
 646                 ret = -ENOMEM;
 647                 rdsdebug("recv allocation failed\n");
 648                 goto sends_out;
 649         }
 650
 651         rds_ib_recv_init_ack(ic);
 652
 653         rdsdebug("conn %p pd %p cq %p %p\n", conn, ic->i_pd,
 654                  ic->i_send_cq, ic->i_recv_cq);
 655
 656         goto out;
 657
 658 sends_out:
 659         vfree(ic->i_sends);
 660
 661 ack_dma_out:
 662         dma_pool_free(pool, ic->i_ack, ic->i_ack_dma);
 663         ic->i_ack = NULL;
 664
 665 recv_hdrs_dma_out:
 666         rds_dma_hdrs_free(pool, ic->i_recv_hdrs, ic->i_recv_hdrs_dma,
 667                           ic->i_recv_ring.w_nr);
 668         ic->i_recv_hdrs = NULL;
 669         ic->i_recv_hdrs_dma = NULL;
 670
 671 send_hdrs_dma_out:
 672         rds_dma_hdrs_free(pool, ic->i_send_hdrs, ic->i_send_hdrs_dma,
 673                           ic->i_send_ring.w_nr);
 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 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_accept() calls rdma_reject() internally if it fails */
 917         if (rdma_accept(cm_id, &conn_param))
 918                 rds_ib_conn_error(conn, "rdma_accept failed\n");
 919
 920 out:
 921         if (conn)
 922                 mutex_unlock(&conn->c_cm_lock);
 923         if (err)
 924                 rdma_reject(cm_id, &err, sizeof(int));
 925         return destroy;
 926 }
 927
 928
 929 int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id, bool isv6)
 930 {
 931         struct rds_connection *conn = cm_id->context;
 932         struct rds_ib_connection *ic = conn->c_transport_data;
 933         struct rdma_conn_param conn_param;
 934         union rds_ib_conn_priv dp;
 935         int ret;
 936
 937         /* If the peer doesn't do protocol negotiation, we must
 938          * default to RDSv3.0 */
 939         rds_ib_set_protocol(conn, RDS_PROTOCOL_4_1);
 940         ic->i_flowctl = rds_ib_sysctl_flow_control;     /* advertise flow control */
 941
 942         ret = rds_ib_setup_qp(conn);
 943         if (ret) {
 944                 rds_ib_conn_error(conn, "rds_ib_setup_qp failed (%d)\n", ret);
 945                 goto out;
 946         }
 947
 948         rds_ib_cm_fill_conn_param(conn, &conn_param, &dp,
 949                                   conn->c_proposed_version,
 950                                   UINT_MAX, UINT_MAX, isv6);
 951         ret = rdma_connect(cm_id, &conn_param);
 952         if (ret)
 953                 rds_ib_conn_error(conn, "rdma_connect failed (%d)\n", ret);
 954
 955 out:
 956         /* Beware - returning non-zero tells the rdma_cm to destroy
 957          * the cm_id. We should certainly not do it as long as we still
 958          * "own" the cm_id. */
 959         if (ret) {
 960                 if (ic->i_cm_id == cm_id)
 961                         ret = 0;
 962         }
 963         ic->i_active_side = true;
 964         return ret;
 965 }
 966
 967 int rds_ib_conn_path_connect(struct rds_conn_path *cp)
 968 {
 969         struct rds_connection *conn = cp->cp_conn;
 970         struct sockaddr_storage src, dest;
 971         rdma_cm_event_handler handler;
 972         struct rds_ib_connection *ic;
 973         int ret;
 974
 975         ic = conn->c_transport_data;
 976
 977         /* XXX I wonder what affect the port space has */
 978         /* delegate cm event handler to rdma_transport */
 979 #if IS_ENABLED(CONFIG_IPV6)
 980         if (conn->c_isv6)
 981                 handler = rds6_rdma_cm_event_handler;
 982         else
 983 #endif
 984                 handler = rds_rdma_cm_event_handler;
 985         ic->i_cm_id = rdma_create_id(&init_net, handler, conn,
 986                                      RDMA_PS_TCP, IB_QPT_RC);
 987         if (IS_ERR(ic->i_cm_id)) {
 988                 ret = PTR_ERR(ic->i_cm_id);
 989                 ic->i_cm_id = NULL;
 990                 rdsdebug("rdma_create_id() failed: %d\n", ret);
 991                 goto out;
 992         }
 993
 994         rdsdebug("created cm id %p for conn %p\n", ic->i_cm_id, conn);
 995
 996         if (ipv6_addr_v4mapped(&conn->c_faddr)) {
 997                 struct sockaddr_in *sin;
 998
 999                 sin = (struct sockaddr_in *)&src;
1000                 sin->sin_family = AF_INET;
1001                 sin->sin_addr.s_addr = conn->c_laddr.s6_addr32[3];
1002                 sin->sin_port = 0;
1003
1004                 sin = (struct sockaddr_in *)&dest;
1005                 sin->sin_family = AF_INET;
1006                 sin->sin_addr.s_addr = conn->c_faddr.s6_addr32[3];
1007                 sin->sin_port = htons(RDS_PORT);
1008         } else {
1009                 struct sockaddr_in6 *sin6;
1010
1011                 sin6 = (struct sockaddr_in6 *)&src;
1012                 sin6->sin6_family = AF_INET6;
1013                 sin6->sin6_addr = conn->c_laddr;
1014                 sin6->sin6_port = 0;
1015                 sin6->sin6_scope_id = conn->c_dev_if;
1016
1017                 sin6 = (struct sockaddr_in6 *)&dest;
1018                 sin6->sin6_family = AF_INET6;
1019                 sin6->sin6_addr = conn->c_faddr;
1020                 sin6->sin6_port = htons(RDS_CM_PORT);
1021                 sin6->sin6_scope_id = conn->c_dev_if;
1022         }
1023
1024         ret = rdma_resolve_addr(ic->i_cm_id, (struct sockaddr *)&src,
1025                                 (struct sockaddr *)&dest,
1026                                 RDS_RDMA_RESOLVE_TIMEOUT_MS);
1027         if (ret) {
1028                 rdsdebug("addr resolve failed for cm id %p: %d\n", ic->i_cm_id,
1029                          ret);
1030                 rdma_destroy_id(ic->i_cm_id);
1031                 ic->i_cm_id = NULL;
1032         }
1033
1034 out:
1035         return ret;
1036 }
1037
1038 /*
1039  * This is so careful about only cleaning up resources that were built up
1040  * so that it can be called at any point during startup.  In fact it
1041  * can be called multiple times for a given connection.
1042  */
1043 void rds_ib_conn_path_shutdown(struct rds_conn_path *cp)
1044 {
1045         struct rds_connection *conn = cp->cp_conn;
1046         struct rds_ib_connection *ic = conn->c_transport_data;
1047         int err = 0;
1048
1049         rdsdebug("cm %p pd %p cq %p %p qp %p\n", ic->i_cm_id,
1050                  ic->i_pd, ic->i_send_cq, ic->i_recv_cq,
1051                  ic->i_cm_id ? ic->i_cm_id->qp : NULL);
1052
1053         if (ic->i_cm_id) {
1054                 rdsdebug("disconnecting cm %p\n", ic->i_cm_id);
1055                 err = rdma_disconnect(ic->i_cm_id);
1056                 if (err) {
1057                         /* Actually this may happen quite frequently, when
1058                          * an outgoing connect raced with an incoming connect.
1059                          */
1060                         rdsdebug("failed to disconnect, cm: %p err %d\n",
1061                                 ic->i_cm_id, err);
1062                 }
1063
1064                 /* kick off "flush_worker" for all pools in order to reap
1065                  * all FRMR registrations that are still marked "FRMR_IS_INUSE"
1066                  */
1067                 rds_ib_flush_mrs();
1068
1069                 /*
1070                  * We want to wait for tx and rx completion to finish
1071                  * before we tear down the connection, but we have to be
1072                  * careful not to get stuck waiting on a send ring that
1073                  * only has unsignaled sends in it.  We've shutdown new
1074                  * sends before getting here so by waiting for signaled
1075                  * sends to complete we're ensured that there will be no
1076                  * more tx processing.
1077                  */
1078                 wait_event(rds_ib_ring_empty_wait,
1079                            rds_ib_ring_empty(&ic->i_recv_ring) &&
1080                            (atomic_read(&ic->i_signaled_sends) == 0) &&
1081                            (atomic_read(&ic->i_fastreg_inuse_count) == 0) &&
1082                            (atomic_read(&ic->i_fastreg_wrs) == RDS_IB_DEFAULT_FR_WR));
1083                 tasklet_kill(&ic->i_send_tasklet);
1084                 tasklet_kill(&ic->i_recv_tasklet);
1085
1086                 atomic_set(&ic->i_cq_quiesce, 1);
1087
1088                 /* first destroy the ib state that generates callbacks */
1089                 if (ic->i_cm_id->qp)
1090                         rdma_destroy_qp(ic->i_cm_id);
1091                 if (ic->i_send_cq) {
1092                         if (ic->rds_ibdev)
1093                                 ibdev_put_vector(ic->rds_ibdev, ic->i_scq_vector);
1094                         ib_destroy_cq(ic->i_send_cq);
1095                 }
1096
1097                 if (ic->i_recv_cq) {
1098                         if (ic->rds_ibdev)
1099                                 ibdev_put_vector(ic->rds_ibdev, ic->i_rcq_vector);
1100                         ib_destroy_cq(ic->i_recv_cq);
1101                 }
1102
1103                 if (ic->rds_ibdev) {
1104                         struct dma_pool *pool;
1105
1106                         pool = ic->rds_ibdev->rid_hdrs_pool;
1107
1108                         /* then free the resources that ib callbacks use */
1109                         if (ic->i_send_hdrs) {
1110                                 rds_dma_hdrs_free(pool, ic->i_send_hdrs,
1111                                                   ic->i_send_hdrs_dma,
1112                                                   ic->i_send_ring.w_nr);
1113                                 ic->i_send_hdrs = NULL;
1114                                 ic->i_send_hdrs_dma = NULL;
1115                         }
1116
1117                         if (ic->i_recv_hdrs) {
1118                                 rds_dma_hdrs_free(pool, ic->i_recv_hdrs,
1119                                                   ic->i_recv_hdrs_dma,
1120                                                   ic->i_recv_ring.w_nr);
1121                                 ic->i_recv_hdrs = NULL;
1122                                 ic->i_recv_hdrs_dma = NULL;
1123                         }
1124
1125                         if (ic->i_ack) {
1126                                 dma_pool_free(pool, ic->i_ack, ic->i_ack_dma);
1127                                 ic->i_ack = NULL;
1128                         }
1129                 } else {
1130                         WARN_ON(ic->i_send_hdrs);
1131                         WARN_ON(ic->i_send_hdrs_dma);
1132                         WARN_ON(ic->i_recv_hdrs);
1133                         WARN_ON(ic->i_recv_hdrs_dma);
1134                         WARN_ON(ic->i_ack);
1135                 }
1136
1137                 if (ic->i_sends)
1138                         rds_ib_send_clear_ring(ic);
1139                 if (ic->i_recvs)
1140                         rds_ib_recv_clear_ring(ic);
1141
1142                 rdma_destroy_id(ic->i_cm_id);
1143
1144                 /*
1145                  * Move connection back to the nodev list.
1146                  */
1147                 if (ic->rds_ibdev)
1148                         rds_ib_remove_conn(ic->rds_ibdev, conn);
1149
1150                 ic->i_cm_id = NULL;
1151                 ic->i_pd = NULL;
1152                 ic->i_send_cq = NULL;
1153                 ic->i_recv_cq = NULL;
1154         }
1155         BUG_ON(ic->rds_ibdev);
1156
1157         /* Clear pending transmit */
1158         if (ic->i_data_op) {
1159                 struct rds_message *rm;
1160
1161                 rm = container_of(ic->i_data_op, struct rds_message, data);
1162                 rds_message_put(rm);
1163                 ic->i_data_op = NULL;
1164         }
1165
1166         /* Clear the ACK state */
1167         clear_bit(IB_ACK_IN_FLIGHT, &ic->i_ack_flags);
1168 #ifdef KERNEL_HAS_ATOMIC64
1169         atomic64_set(&ic->i_ack_next, 0);
1170 #else
1171         ic->i_ack_next = 0;
1172 #endif
1173         ic->i_ack_recv = 0;
1174
1175         /* Clear flow control state */
1176         ic->i_flowctl = 0;
1177         atomic_set(&ic->i_credits, 0);
1178
1179         rds_ib_ring_init(&ic->i_send_ring, rds_ib_sysctl_max_send_wr);
1180         rds_ib_ring_init(&ic->i_recv_ring, rds_ib_sysctl_max_recv_wr);
1181
1182         if (ic->i_ibinc) {
1183                 rds_inc_put(&ic->i_ibinc->ii_inc);
1184                 ic->i_ibinc = NULL;
1185         }
1186
1187         vfree(ic->i_sends);
1188         ic->i_sends = NULL;
1189         vfree(ic->i_recvs);
1190         ic->i_recvs = NULL;
1191         ic->i_active_side = false;
1192 }
1193
1194 int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp)
1195 {
1196         struct rds_ib_connection *ic;
1197         unsigned long flags;
1198         int ret;
1199
1200         /* XXX too lazy? */
1201         ic = kzalloc(sizeof(struct rds_ib_connection), gfp);
1202         if (!ic)
1203                 return -ENOMEM;
1204
1205         ret = rds_ib_recv_alloc_caches(ic, gfp);
1206         if (ret) {
1207                 kfree(ic);
1208                 return ret;
1209         }
1210
1211         INIT_LIST_HEAD(&ic->ib_node);
1212         tasklet_init(&ic->i_send_tasklet, rds_ib_tasklet_fn_send,
1213                      (unsigned long)ic);
1214         tasklet_init(&ic->i_recv_tasklet, rds_ib_tasklet_fn_recv,
1215                      (unsigned long)ic);
1216         mutex_init(&ic->i_recv_mutex);
1217 #ifndef KERNEL_HAS_ATOMIC64
1218         spin_lock_init(&ic->i_ack_lock);
1219 #endif
1220         atomic_set(&ic->i_signaled_sends, 0);
1221         atomic_set(&ic->i_fastreg_wrs, RDS_IB_DEFAULT_FR_WR);
1222
1223         /*
1224          * rds_ib_conn_shutdown() waits for these to be emptied so they
1225          * must be initialized before it can be called.
1226          */
1227         rds_ib_ring_init(&ic->i_send_ring, rds_ib_sysctl_max_send_wr);
1228         rds_ib_ring_init(&ic->i_recv_ring, rds_ib_sysctl_max_recv_wr);
1229
1230         ic->conn = conn;
1231         conn->c_transport_data = ic;
1232
1233         spin_lock_irqsave(&ib_nodev_conns_lock, flags);
1234         list_add_tail(&ic->ib_node, &ib_nodev_conns);
1235         spin_unlock_irqrestore(&ib_nodev_conns_lock, flags);
1236
1237
1238         rdsdebug("conn %p conn ic %p\n", conn, conn->c_transport_data);
1239         return 0;
1240 }
1241
1242 /*
1243  * Free a connection. Connection must be shut down and not set for reconnect.
1244  */
1245 void rds_ib_conn_free(void *arg)
1246 {
1247         struct rds_ib_connection *ic = arg;
1248         spinlock_t      *lock_ptr;
1249
1250         rdsdebug("ic %p\n", ic);
1251
1252         /*
1253          * Conn is either on a dev's list or on the nodev list.
1254          * A race with shutdown() or connect() would cause problems
1255          * (since rds_ibdev would change) but that should never happen.
1256          */
1257         lock_ptr = ic->rds_ibdev ? &ic->rds_ibdev->spinlock : &ib_nodev_conns_lock;
1258
1259         spin_lock_irq(lock_ptr);
1260         list_del(&ic->ib_node);
1261         spin_unlock_irq(lock_ptr);
1262
1263         rds_ib_recv_free_caches(ic);
1264
1265         kfree(ic);
1266 }
1267
1268
1269 /*
1270  * An error occurred on the connection
1271  */
1272 void
1273 __rds_ib_conn_error(struct rds_connection *conn, const char *fmt, ...)
1274 {
1275         va_list ap;
1276
1277         rds_conn_drop(conn);
1278
1279         va_start(ap, fmt);
1280         vprintk(fmt, ap);
1281         va_end(ap);
1282 }