net/rds/ib_cm.c

   1 /*
   2  * Copyright (c) 2006, 2018 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
  40 #include "rds_single_path.h"
  41 #include "rds.h"
  42 #include "ib.h"
  43
  44 /*
  45  * Set the selected protocol version
  46  */
  47 static void rds_ib_set_protocol(struct rds_connection *conn, unsigned int version)
  48 {
  49         conn->c_version = version;
  50 }
  51
  52 /*
  53  * Set up flow control
  54  */
  55 static void rds_ib_set_flow_control(struct rds_connection *conn, u32 credits)
  56 {
  57         struct rds_ib_connection *ic = conn->c_transport_data;
  58
  59         if (rds_ib_sysctl_flow_control && credits != 0) {
  60                 /* We're doing flow control */
  61                 ic->i_flowctl = 1;
  62                 rds_ib_send_add_credits(conn, credits);
  63         } else {
  64                 ic->i_flowctl = 0;
  65         }
  66 }
  67
  68 /*
  69  * Tune RNR behavior. Without flow control, we use a rather
  70  * low timeout, but not the absolute minimum - this should
  71  * be tunable.
  72  *
  73  * We already set the RNR retry count to 7 (which is the
  74  * smallest infinite number :-) above.
  75  * If flow control is off, we want to change this back to 0
  76  * so that we learn quickly when our credit accounting is
  77  * buggy.
  78  *
  79  * Caller passes in a qp_attr pointer - don't waste stack spacv
  80  * by allocation this twice.
  81  */
  82 static void
  83 rds_ib_tune_rnr(struct rds_ib_connection *ic, struct ib_qp_attr *attr)
  84 {
  85         int ret;
  86
  87         attr->min_rnr_timer = IB_RNR_TIMER_000_32;
  88         ret = ib_modify_qp(ic->i_cm_id->qp, attr, IB_QP_MIN_RNR_TIMER);
  89         if (ret)
  90                 printk(KERN_NOTICE "ib_modify_qp(IB_QP_MIN_RNR_TIMER): err=%d\n", -ret);
  91 }
  92
  93 /*
  94  * Connection established.
  95  * We get here for both outgoing and incoming connection.
  96  */
  97 void rds_ib_cm_connect_complete(struct rds_connection *conn, struct rdma_cm_event *event)
  98 {
  99         struct rds_ib_connection *ic = conn->c_transport_data;
 100         const union rds_ib_conn_priv *dp = NULL;
 101         struct ib_qp_attr qp_attr;
 102         __be64 ack_seq = 0;
 103         __be32 credit = 0;
 104         u8 major = 0;
 105         u8 minor = 0;
 106         int err;
 107
 108         dp = event->param.conn.private_data;
 109         if (conn->c_isv6) {
 110                 if (event->param.conn.private_data_len >=
 111                     sizeof(struct rds6_ib_connect_private)) {
 112                         major = dp->ricp_v6.dp_protocol_major;
 113                         minor = dp->ricp_v6.dp_protocol_minor;
 114                         credit = dp->ricp_v6.dp_credit;
 115                         /* dp structure start is not guaranteed to be 8 bytes
 116                          * aligned.  Since dp_ack_seq is 64-bit extended load
 117                          * operations can be used so go through get_unaligned
 118                          * to avoid unaligned errors.
 119                          */
 120                         ack_seq = get_unaligned(&dp->ricp_v6.dp_ack_seq);
 121                 }
 122         } else if (event->param.conn.private_data_len >=
 123                    sizeof(struct rds_ib_connect_private)) {
 124                 major = dp->ricp_v4.dp_protocol_major;
 125                 minor = dp->ricp_v4.dp_protocol_minor;
 126                 credit = dp->ricp_v4.dp_credit;
 127                 ack_seq = get_unaligned(&dp->ricp_v4.dp_ack_seq);
 128         }
 129
 130         /* make sure it isn't empty data */
 131         if (major) {
 132                 rds_ib_set_protocol(conn, RDS_PROTOCOL(major, minor));
 133                 rds_ib_set_flow_control(conn, be32_to_cpu(credit));
 134         }
 135
 136         if (conn->c_version < RDS_PROTOCOL_VERSION) {
 137                 if (conn->c_version != RDS_PROTOCOL_COMPAT_VERSION) {
 138                         pr_notice("RDS/IB: Connection <%pI6c,%pI6c> version %u.%u no longer supported\n",
 139                                   &conn->c_laddr, &conn->c_faddr,
 140                                   RDS_PROTOCOL_MAJOR(conn->c_version),
 141                                   RDS_PROTOCOL_MINOR(conn->c_version));
 142                         rds_conn_destroy(conn);
 143                         return;
 144                 }
 145         }
 146
 147         pr_notice("RDS/IB: %s conn connected <%pI6c,%pI6c,%d> version %u.%u%s\n",
 148                   ic->i_active_side ? "Active" : "Passive",
 149                   &conn->c_laddr, &conn->c_faddr, conn->c_tos,
 150                   RDS_PROTOCOL_MAJOR(conn->c_version),
 151                   RDS_PROTOCOL_MINOR(conn->c_version),
 152                   ic->i_flowctl ? ", flow control" : "");
 153
 154         atomic_set(&ic->i_cq_quiesce, 0);
 155
 156         /* Init rings and fill recv. this needs to wait until protocol
 157          * negotiation is complete, since ring layout is different
 158          * from 3.1 to 4.1.
 159          */
 160         rds_ib_send_init_ring(ic);
 161         rds_ib_recv_init_ring(ic);
 162         /* Post receive buffers - as a side effect, this will update
 163          * the posted credit count. */
 164         rds_ib_recv_refill(conn, 1, GFP_KERNEL);
 165
 166         /* Tune RNR behavior */
 167         rds_ib_tune_rnr(ic, &qp_attr);
 168
 169         qp_attr.qp_state = IB_QPS_RTS;
 170         err = ib_modify_qp(ic->i_cm_id->qp, &qp_attr, IB_QP_STATE);
 171         if (err)
 172                 printk(KERN_NOTICE "ib_modify_qp(IB_QP_STATE, RTS): err=%d\n", err);
 173
 174         /* update ib_device with this local ipaddr */
 175         err = rds_ib_update_ipaddr(ic->rds_ibdev, &conn->c_laddr);
 176         if (err)
 177                 printk(KERN_ERR "rds_ib_update_ipaddr failed (%d)\n",
 178                         err);
 179
 180         /* If the peer gave us the last packet it saw, process this as if
 181          * we had received a regular ACK. */
 182         if (dp) {
 183                 if (ack_seq)
 184                         rds_send_drop_acked(conn, be64_to_cpu(ack_seq),
 185                                             NULL);
 186         }
 187
 188         conn->c_proposed_version = conn->c_version;
 189         rds_connect_complete(conn);
 190 }
 191
 192 static void rds_ib_cm_fill_conn_param(struct rds_connection *conn,
 193                                       struct rdma_conn_param *conn_param,
 194                                       union rds_ib_conn_priv *dp,
 195                                       u32 protocol_version,
 196                                       u32 max_responder_resources,
 197                                       u32 max_initiator_depth,
 198                                       bool isv6)
 199 {
 200         struct rds_ib_connection *ic = conn->c_transport_data;
 201         struct rds_ib_device *rds_ibdev = ic->rds_ibdev;
 202
 203         memset(conn_param, 0, sizeof(struct rdma_conn_param));
 204
 205         conn_param->responder_resources =
 206                 min_t(u32, rds_ibdev->max_responder_resources, max_responder_resources);
 207         conn_param->initiator_depth =
 208                 min_t(u32, rds_ibdev->max_initiator_depth, max_initiator_depth);
 209         conn_param->retry_count = min_t(unsigned int, rds_ib_retry_count, 7);
 210         conn_param->rnr_retry_count = 7;
 211
 212         if (dp) {
 213                 memset(dp, 0, sizeof(*dp));
 214                 if (isv6) {
 215                         dp->ricp_v6.dp_saddr = conn->c_laddr;
 216                         dp->ricp_v6.dp_daddr = conn->c_faddr;
 217                         dp->ricp_v6.dp_protocol_major =
 218                             RDS_PROTOCOL_MAJOR(protocol_version);
 219                         dp->ricp_v6.dp_protocol_minor =
 220                             RDS_PROTOCOL_MINOR(protocol_version);
 221                         dp->ricp_v6.dp_protocol_minor_mask =
 222                             cpu_to_be16(RDS_IB_SUPPORTED_PROTOCOLS);
 223                         dp->ricp_v6.dp_ack_seq =
 224                             cpu_to_be64(rds_ib_piggyb_ack(ic));
 225                         dp->ricp_v6.dp_cmn.ricpc_dp_toss = conn->c_tos;
 226
 227                         conn_param->private_data = &dp->ricp_v6;
 228                         conn_param->private_data_len = sizeof(dp->ricp_v6);
 229                 } else {
 230                         dp->ricp_v4.dp_saddr = conn->c_laddr.s6_addr32[3];
 231                         dp->ricp_v4.dp_daddr = conn->c_faddr.s6_addr32[3];
 232                         dp->ricp_v4.dp_protocol_major =
 233                             RDS_PROTOCOL_MAJOR(protocol_version);
 234                         dp->ricp_v4.dp_protocol_minor =
 235                             RDS_PROTOCOL_MINOR(protocol_version);
 236                         dp->ricp_v4.dp_protocol_minor_mask =
 237                             cpu_to_be16(RDS_IB_SUPPORTED_PROTOCOLS);
 238                         dp->ricp_v4.dp_ack_seq =
 239                             cpu_to_be64(rds_ib_piggyb_ack(ic));
 240                         dp->ricp_v4.dp_cmn.ricpc_dp_toss = conn->c_tos;
 241
 242                         conn_param->private_data = &dp->ricp_v4;
 243                         conn_param->private_data_len = sizeof(dp->ricp_v4);
 244                 }
 245
 246                 /* Advertise flow control */
 247                 if (ic->i_flowctl) {
 248                         unsigned int credits;
 249
 250                         credits = IB_GET_POST_CREDITS
 251                                 (atomic_read(&ic->i_credits));
 252                         if (isv6)
 253                                 dp->ricp_v6.dp_credit = cpu_to_be32(credits);
 254                         else
 255                                 dp->ricp_v4.dp_credit = cpu_to_be32(credits);
 256                         atomic_sub(IB_SET_POST_CREDITS(credits),
 257                                    &ic->i_credits);
 258                 }
 259         }
 260 }
 261
 262 static void rds_ib_cq_event_handler(struct ib_event *event, void *data)
 263 {
 264         rdsdebug("event %u (%s) data %p\n",
 265                  event->event, ib_event_msg(event->event), data);
 266 }
 267
 268 /* Plucking the oldest entry from the ring can be done concurrently with
 269  * the thread refilling the ring.  Each ring operation is protected by
 270  * spinlocks and the transient state of refilling doesn't change the
 271  * recording of which entry is oldest.
 272  *
 273  * This relies on IB only calling one cq comp_handler for each cq so that
 274  * there will only be one caller of rds_recv_incoming() per RDS connection.
 275  */
 276 static void rds_ib_cq_comp_handler_recv(struct ib_cq *cq, void *context)
 277 {
 278         struct rds_connection *conn = context;
 279         struct rds_ib_connection *ic = conn->c_transport_data;
 280
 281         rdsdebug("conn %p cq %p\n", conn, cq);
 282
 283         rds_ib_stats_inc(s_ib_evt_handler_call);
 284
 285         tasklet_schedule(&ic->i_recv_tasklet);
 286 }
 287
 288 static void poll_scq(struct rds_ib_connection *ic, struct ib_cq *cq,
 289                      struct ib_wc *wcs)
 290 {
 291         int nr, i;
 292         struct ib_wc *wc;
 293
 294         while ((nr = ib_poll_cq(cq, RDS_IB_WC_MAX, wcs)) > 0) {
 295                 for (i = 0; i < nr; i++) {
 296                         wc = wcs + i;
 297                         rdsdebug("wc wr_id 0x%llx status %u byte_len %u imm_data %u\n",
 298                                  (unsigned long long)wc->wr_id, wc->status,
 299                                  wc->byte_len, be32_to_cpu(wc->ex.imm_data));
 300
 301                         if (wc->wr_id <= ic->i_send_ring.w_nr ||
 302                             wc->wr_id == RDS_IB_ACK_WR_ID)
 303                                 rds_ib_send_cqe_handler(ic, wc);
 304                         else
 305                                 rds_ib_mr_cqe_handler(ic, wc);
 306
 307                 }
 308         }
 309 }
 310
 311 static void rds_ib_tasklet_fn_send(unsigned long data)
 312 {
 313         struct rds_ib_connection *ic = (struct rds_ib_connection *)data;
 314         struct rds_connection *conn = ic->conn;
 315
 316         rds_ib_stats_inc(s_ib_tasklet_call);
 317
 318         /* if cq has been already reaped, ignore incoming cq event */
 319         if (atomic_read(&ic->i_cq_quiesce))
 320                 return;
 321
 322         poll_scq(ic, ic->i_send_cq, ic->i_send_wc);
 323         ib_req_notify_cq(ic->i_send_cq, IB_CQ_NEXT_COMP);
 324         poll_scq(ic, ic->i_send_cq, ic->i_send_wc);
 325
 326         if (rds_conn_up(conn) &&
 327             (!test_bit(RDS_LL_SEND_FULL, &conn->c_flags) ||
 328             test_bit(0, &conn->c_map_queued)))
 329                 rds_send_xmit(&ic->conn->c_path[0]);
 330 }
 331
 332 static void poll_rcq(struct rds_ib_connection *ic, struct ib_cq *cq,
 333                      struct ib_wc *wcs,
 334                      struct rds_ib_ack_state *ack_state)
 335 {
 336         int nr, i;
 337         struct ib_wc *wc;
 338
 339         while ((nr = ib_poll_cq(cq, RDS_IB_WC_MAX, wcs)) > 0) {
 340                 for (i = 0; i < nr; i++) {
 341                         wc = wcs + i;
 342                         rdsdebug("wc wr_id 0x%llx status %u byte_len %u imm_data %u\n",
 343                                  (unsigned long long)wc->wr_id, wc->status,
 344                                  wc->byte_len, be32_to_cpu(wc->ex.imm_data));
 345
 346                         rds_ib_recv_cqe_handler(ic, wc, ack_state);
 347                 }
 348         }
 349 }
 350
 351 static void rds_ib_tasklet_fn_recv(unsigned long data)
 352 {
 353         struct rds_ib_connection *ic = (struct rds_ib_connection *)data;
 354         struct rds_connection *conn = ic->conn;
 355         struct rds_ib_device *rds_ibdev = ic->rds_ibdev;
 356         struct rds_ib_ack_state state;
 357
 358         if (!rds_ibdev)
 359                 rds_conn_drop(conn);
 360
 361         rds_ib_stats_inc(s_ib_tasklet_call);
 362
 363         /* if cq has been already reaped, ignore incoming cq event */
 364         if (atomic_read(&ic->i_cq_quiesce))
 365                 return;
 366
 367         memset(&state, 0, sizeof(state));
 368         poll_rcq(ic, ic->i_recv_cq, ic->i_recv_wc, &state);
 369         ib_req_notify_cq(ic->i_recv_cq, IB_CQ_SOLICITED);
 370         poll_rcq(ic, ic->i_recv_cq, ic->i_recv_wc, &state);
 371
 372         if (state.ack_next_valid)
 373                 rds_ib_set_ack(ic, state.ack_next, state.ack_required);
 374         if (state.ack_recv_valid && state.ack_recv > ic->i_ack_recv) {
 375                 rds_send_drop_acked(conn, state.ack_recv, NULL);
 376                 ic->i_ack_recv = state.ack_recv;
 377         }
 378
 379         if (rds_conn_up(conn))
 380                 rds_ib_attempt_ack(ic);
 381 }
 382
 383 static void rds_ib_qp_event_handler(struct ib_event *event, void *data)
 384 {
 385         struct rds_connection *conn = data;
 386         struct rds_ib_connection *ic = conn->c_transport_data;
 387
 388         rdsdebug("conn %p ic %p event %u (%s)\n", conn, ic, event->event,
 389                  ib_event_msg(event->event));
 390
 391         switch (event->event) {
 392         case IB_EVENT_COMM_EST:
 393                 rdma_notify(ic->i_cm_id, IB_EVENT_COMM_EST);
 394                 break;
 395         default:
 396                 rdsdebug("Fatal QP Event %u (%s) - connection %pI6c->%pI6c, reconnecting\n",
 397                          event->event, ib_event_msg(event->event),
 398                          &conn->c_laddr, &conn->c_faddr);
 399                 rds_conn_drop(conn);
 400                 break;
 401         }
 402 }
 403
 404 static void rds_ib_cq_comp_handler_send(struct ib_cq *cq, void *context)
 405 {
 406         struct rds_connection *conn = context;
 407         struct rds_ib_connection *ic = conn->c_transport_data;
 408
 409         rdsdebug("conn %p cq %p\n", conn, cq);
 410
 411         rds_ib_stats_inc(s_ib_evt_handler_call);
 412
 413         tasklet_schedule(&ic->i_send_tasklet);
 414 }
 415
 416 static inline int ibdev_get_unused_vector(struct rds_ib_device *rds_ibdev)
 417 {
 418         int min = rds_ibdev->vector_load[rds_ibdev->dev->num_comp_vectors - 1];
 419         int index = rds_ibdev->dev->num_comp_vectors - 1;
 420         int i;
 421
 422         for (i = rds_ibdev->dev->num_comp_vectors - 1; i >= 0; i--) {
 423                 if (rds_ibdev->vector_load[i] < min) {
 424                         index = i;
 425                         min = rds_ibdev->vector_load[i];
 426                 }
 427         }
 428
 429         rds_ibdev->vector_load[index]++;
 430         return index;
 431 }
 432
 433 static inline void ibdev_put_vector(struct rds_ib_device *rds_ibdev, int index)
 434 {
 435         rds_ibdev->vector_load[index]--;
 436 }
 437
 438 /*
 439  * This needs to be very careful to not leave IS_ERR pointers around for
 440  * cleanup to trip over.
 441  */
 442 static int rds_ib_setup_qp(struct rds_connection *conn)
 443 {
 444         struct rds_ib_connection *ic = conn->c_transport_data;
 445         struct ib_device *dev = ic->i_cm_id->device;
 446         struct ib_qp_init_attr attr;
 447         struct ib_cq_init_attr cq_attr = {};
 448         struct rds_ib_device *rds_ibdev;
 449         int ret, fr_queue_space;
 450
 451         /*
 452          * It's normal to see a null device if an incoming connection races
 453          * with device removal, so we don't print a warning.
 454          */
 455         rds_ibdev = rds_ib_get_client_data(dev);
 456         if (!rds_ibdev)
 457                 return -EOPNOTSUPP;
 458
 459         /* The fr_queue_space is currently set to 512, to add extra space on
 460          * completion queue and send queue. This extra space is used for FRMR
 461          * registration and invalidation work requests
 462          */
 463         fr_queue_space = (rds_ibdev->use_fastreg ? RDS_IB_DEFAULT_FR_WR : 0);
 464
 465         /* add the conn now so that connection establishment has the dev */
 466         rds_ib_add_conn(rds_ibdev, conn);
 467
 468         if (rds_ibdev->max_wrs < ic->i_send_ring.w_nr + 1)
 469                 rds_ib_ring_resize(&ic->i_send_ring, rds_ibdev->max_wrs - 1);
 470         if (rds_ibdev->max_wrs < ic->i_recv_ring.w_nr + 1)
 471                 rds_ib_ring_resize(&ic->i_recv_ring, rds_ibdev->max_wrs - 1);
 472
 473         /* Protection domain and memory range */
 474         ic->i_pd = rds_ibdev->pd;
 475
 476         ic->i_scq_vector = ibdev_get_unused_vector(rds_ibdev);
 477         cq_attr.cqe = ic->i_send_ring.w_nr + fr_queue_space + 1;
 478         cq_attr.comp_vector = ic->i_scq_vector;
 479         ic->i_send_cq = ib_create_cq(dev, rds_ib_cq_comp_handler_send,
 480                                      rds_ib_cq_event_handler, conn,
 481                                      &cq_attr);
 482         if (IS_ERR(ic->i_send_cq)) {
 483                 ret = PTR_ERR(ic->i_send_cq);
 484                 ic->i_send_cq = NULL;
 485                 ibdev_put_vector(rds_ibdev, ic->i_scq_vector);
 486                 rdsdebug("ib_create_cq send failed: %d\n", ret);
 487                 goto rds_ibdev_out;
 488         }
 489
 490         ic->i_rcq_vector = ibdev_get_unused_vector(rds_ibdev);
 491         cq_attr.cqe = ic->i_recv_ring.w_nr;
 492         cq_attr.comp_vector = ic->i_rcq_vector;
 493         ic->i_recv_cq = ib_create_cq(dev, rds_ib_cq_comp_handler_recv,
 494                                      rds_ib_cq_event_handler, conn,
 495                                      &cq_attr);
 496         if (IS_ERR(ic->i_recv_cq)) {
 497                 ret = PTR_ERR(ic->i_recv_cq);
 498                 ic->i_recv_cq = NULL;
 499                 ibdev_put_vector(rds_ibdev, ic->i_rcq_vector);
 500                 rdsdebug("ib_create_cq recv failed: %d\n", ret);
 501                 goto send_cq_out;
 502         }
 503
 504         ret = ib_req_notify_cq(ic->i_send_cq, IB_CQ_NEXT_COMP);
 505         if (ret) {
 506                 rdsdebug("ib_req_notify_cq send failed: %d\n", ret);
 507                 goto recv_cq_out;
 508         }
 509
 510         ret = ib_req_notify_cq(ic->i_recv_cq, IB_CQ_SOLICITED);
 511         if (ret) {
 512                 rdsdebug("ib_req_notify_cq recv failed: %d\n", ret);
 513                 goto recv_cq_out;
 514         }
 515
 516         /* XXX negotiate max send/recv with remote? */
 517         memset(&attr, 0, sizeof(attr));
 518         attr.event_handler = rds_ib_qp_event_handler;
 519         attr.qp_context = conn;
 520         /* + 1 to allow for the single ack message */
 521         attr.cap.max_send_wr = ic->i_send_ring.w_nr + fr_queue_space + 1;
 522         attr.cap.max_recv_wr = ic->i_recv_ring.w_nr + 1;
 523         attr.cap.max_send_sge = rds_ibdev->max_sge;
 524         attr.cap.max_recv_sge = RDS_IB_RECV_SGE;
 525         attr.sq_sig_type = IB_SIGNAL_REQ_WR;
 526         attr.qp_type = IB_QPT_RC;
 527         attr.send_cq = ic->i_send_cq;
 528         attr.recv_cq = ic->i_recv_cq;
 529         atomic_set(&ic->i_fastreg_wrs, RDS_IB_DEFAULT_FR_WR);
 530
 531         /*
 532          * XXX this can fail if max_*_wr is too large?  Are we supposed
 533          * to back off until we get a value that the hardware can support?
 534          */
 535         ret = rdma_create_qp(ic->i_cm_id, ic->i_pd, &attr);
 536         if (ret) {
 537                 rdsdebug("rdma_create_qp failed: %d\n", ret);
 538                 goto recv_cq_out;
 539         }
 540
 541         ic->i_send_hdrs = ib_dma_alloc_coherent(dev,
 542                                            ic->i_send_ring.w_nr *
 543                                                 sizeof(struct rds_header),
 544                                            &ic->i_send_hdrs_dma, GFP_KERNEL);
 545         if (!ic->i_send_hdrs) {
 546                 ret = -ENOMEM;
 547                 rdsdebug("ib_dma_alloc_coherent send failed\n");
 548                 goto qp_out;
 549         }
 550
 551         ic->i_recv_hdrs = ib_dma_alloc_coherent(dev,
 552                                            ic->i_recv_ring.w_nr *
 553                                                 sizeof(struct rds_header),
 554                                            &ic->i_recv_hdrs_dma, GFP_KERNEL);
 555         if (!ic->i_recv_hdrs) {
 556                 ret = -ENOMEM;
 557                 rdsdebug("ib_dma_alloc_coherent recv failed\n");
 558                 goto send_hdrs_dma_out;
 559         }
 560
 561         ic->i_ack = ib_dma_alloc_coherent(dev, sizeof(struct rds_header),
 562                                        &ic->i_ack_dma, GFP_KERNEL);
 563         if (!ic->i_ack) {
 564                 ret = -ENOMEM;
 565                 rdsdebug("ib_dma_alloc_coherent ack failed\n");
 566                 goto recv_hdrs_dma_out;
 567         }
 568
 569         ic->i_sends = vzalloc_node(array_size(sizeof(struct rds_ib_send_work),
 570                                               ic->i_send_ring.w_nr),
 571                                    ibdev_to_node(dev));
 572         if (!ic->i_sends) {
 573                 ret = -ENOMEM;
 574                 rdsdebug("send allocation failed\n");
 575                 goto ack_dma_out;
 576         }
 577
 578         ic->i_recvs = vzalloc_node(array_size(sizeof(struct rds_ib_recv_work),
 579                                               ic->i_recv_ring.w_nr),
 580                                    ibdev_to_node(dev));
 581         if (!ic->i_recvs) {
 582                 ret = -ENOMEM;
 583                 rdsdebug("recv allocation failed\n");
 584                 goto sends_out;
 585         }
 586
 587         rds_ib_recv_init_ack(ic);
 588
 589         rdsdebug("conn %p pd %p cq %p %p\n", conn, ic->i_pd,
 590                  ic->i_send_cq, ic->i_recv_cq);
 591
 592         goto out;
 593
 594 sends_out:
 595         vfree(ic->i_sends);
 596 ack_dma_out:
 597         ib_dma_free_coherent(dev, sizeof(struct rds_header),
 598                              ic->i_ack, ic->i_ack_dma);
 599 recv_hdrs_dma_out:
 600         ib_dma_free_coherent(dev, ic->i_recv_ring.w_nr *
 601                                         sizeof(struct rds_header),
 602                                         ic->i_recv_hdrs, ic->i_recv_hdrs_dma);
 603 send_hdrs_dma_out:
 604         ib_dma_free_coherent(dev, ic->i_send_ring.w_nr *
 605                                         sizeof(struct rds_header),
 606                                         ic->i_send_hdrs, ic->i_send_hdrs_dma);
 607 qp_out:
 608         rdma_destroy_qp(ic->i_cm_id);
 609 recv_cq_out:
 610         if (!ib_destroy_cq(ic->i_recv_cq))
 611                 ic->i_recv_cq = NULL;
 612 send_cq_out:
 613         if (!ib_destroy_cq(ic->i_send_cq))
 614                 ic->i_send_cq = NULL;
 615 rds_ibdev_out:
 616         rds_ib_remove_conn(rds_ibdev, conn);
 617 out:
 618         rds_ib_dev_put(rds_ibdev);
 619
 620         return ret;
 621 }
 622
 623 static u32 rds_ib_protocol_compatible(struct rdma_cm_event *event, bool isv6)
 624 {
 625         const union rds_ib_conn_priv *dp = event->param.conn.private_data;
 626         u8 data_len, major, minor;
 627         u32 version = 0;
 628         __be16 mask;
 629         u16 common;
 630
 631         /*
 632          * rdma_cm private data is odd - when there is any private data in the
 633          * request, we will be given a pretty large buffer without telling us the
 634          * original size. The only way to tell the difference is by looking at
 635          * the contents, which are initialized to zero.
 636          * If the protocol version fields aren't set, this is a connection attempt
 637          * from an older version. This could could be 3.0 or 2.0 - we can't tell.
 638          * We really should have changed this for OFED 1.3 :-(
 639          */
 640
 641         /* Be paranoid. RDS always has privdata */
 642         if (!event->param.conn.private_data_len) {
 643                 printk(KERN_NOTICE "RDS incoming connection has no private data, "
 644                         "rejecting\n");
 645                 return 0;
 646         }
 647
 648         if (isv6) {
 649                 data_len = sizeof(struct rds6_ib_connect_private);
 650                 major = dp->ricp_v6.dp_protocol_major;
 651                 minor = dp->ricp_v6.dp_protocol_minor;
 652                 mask = dp->ricp_v6.dp_protocol_minor_mask;
 653         } else {
 654                 data_len = sizeof(struct rds_ib_connect_private);
 655                 major = dp->ricp_v4.dp_protocol_major;
 656                 minor = dp->ricp_v4.dp_protocol_minor;
 657                 mask = dp->ricp_v4.dp_protocol_minor_mask;
 658         }
 659
 660         /* Even if len is crap *now* I still want to check it. -ASG */
 661         if (event->param.conn.private_data_len < data_len || major == 0)
 662                 return RDS_PROTOCOL_4_0;
 663
 664         common = be16_to_cpu(mask) & RDS_IB_SUPPORTED_PROTOCOLS;
 665         if (major == 4 && common) {
 666                 version = RDS_PROTOCOL_4_0;
 667                 while ((common >>= 1) != 0)
 668                         version++;
 669         } else if (RDS_PROTOCOL_COMPAT_VERSION ==
 670                    RDS_PROTOCOL(major, minor)) {
 671                 version = RDS_PROTOCOL_COMPAT_VERSION;
 672         } else {
 673                 if (isv6)
 674                         printk_ratelimited(KERN_NOTICE "RDS: Connection from %pI6c using incompatible protocol version %u.%u\n",
 675                                            &dp->ricp_v6.dp_saddr, major, minor);
 676                 else
 677                         printk_ratelimited(KERN_NOTICE "RDS: Connection from %pI4 using incompatible protocol version %u.%u\n",
 678                                            &dp->ricp_v4.dp_saddr, major, minor);
 679         }
 680         return version;
 681 }
 682
 683 #if IS_ENABLED(CONFIG_IPV6)
 684 /* Given an IPv6 address, find the net_device which hosts that address and
 685  * return its index.  This is used by the rds_ib_cm_handle_connect() code to
 686  * find the interface index of where an incoming request comes from when
 687  * the request is using a link local address.
 688  *
 689  * Note one problem in this search.  It is possible that two interfaces have
 690  * the same link local address.  Unfortunately, this cannot be solved unless
 691  * the underlying layer gives us the interface which an incoming RDMA connect
 692  * request comes from.
 693  */
 694 static u32 __rds_find_ifindex(struct net *net, const struct in6_addr *addr)
 695 {
 696         struct net_device *dev;
 697         int idx = 0;
 698
 699         rcu_read_lock();
 700         for_each_netdev_rcu(net, dev) {
 701                 if (ipv6_chk_addr(net, addr, dev, 1)) {
 702                         idx = dev->ifindex;
 703                         break;
 704                 }
 705         }
 706         rcu_read_unlock();
 707
 708         return idx;
 709 }
 710 #endif
 711
 712 int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id,
 713                              struct rdma_cm_event *event, bool isv6)
 714 {
 715         __be64 lguid = cm_id->route.path_rec->sgid.global.interface_id;
 716         __be64 fguid = cm_id->route.path_rec->dgid.global.interface_id;
 717         const struct rds_ib_conn_priv_cmn *dp_cmn;
 718         struct rds_connection *conn = NULL;
 719         struct rds_ib_connection *ic = NULL;
 720         struct rdma_conn_param conn_param;
 721         const union rds_ib_conn_priv *dp;
 722         union rds_ib_conn_priv dp_rep;
 723         struct in6_addr s_mapped_addr;
 724         struct in6_addr d_mapped_addr;
 725         const struct in6_addr *saddr6;
 726         const struct in6_addr *daddr6;
 727         int destroy = 1;
 728         u32 ifindex = 0;
 729         u32 version;
 730         int err = 1;
 731
 732         /* Check whether the remote protocol version matches ours. */
 733         version = rds_ib_protocol_compatible(event, isv6);
 734         if (!version) {
 735                 err = RDS_RDMA_REJ_INCOMPAT;
 736                 goto out;
 737         }
 738
 739         dp = event->param.conn.private_data;
 740         if (isv6) {
 741 #if IS_ENABLED(CONFIG_IPV6)
 742                 dp_cmn = &dp->ricp_v6.dp_cmn;
 743                 saddr6 = &dp->ricp_v6.dp_saddr;
 744                 daddr6 = &dp->ricp_v6.dp_daddr;
 745                 /* If either address is link local, need to find the
 746                  * interface index in order to create a proper RDS
 747                  * connection.
 748                  */
 749                 if (ipv6_addr_type(daddr6) & IPV6_ADDR_LINKLOCAL) {
 750                         /* Using init_net for now ..  */
 751                         ifindex = __rds_find_ifindex(&init_net, daddr6);
 752                         /* No index found...  Need to bail out. */
 753                         if (ifindex == 0) {
 754                                 err = -EOPNOTSUPP;
 755                                 goto out;
 756                         }
 757                 } else if (ipv6_addr_type(saddr6) & IPV6_ADDR_LINKLOCAL) {
 758                         /* Use our address to find the correct index. */
 759                         ifindex = __rds_find_ifindex(&init_net, daddr6);
 760                         /* No index found...  Need to bail out. */
 761                         if (ifindex == 0) {
 762                                 err = -EOPNOTSUPP;
 763                                 goto out;
 764                         }
 765                 }
 766 #else
 767                 err = -EOPNOTSUPP;
 768                 goto out;
 769 #endif
 770         } else {
 771                 dp_cmn = &dp->ricp_v4.dp_cmn;
 772                 ipv6_addr_set_v4mapped(dp->ricp_v4.dp_saddr, &s_mapped_addr);
 773                 ipv6_addr_set_v4mapped(dp->ricp_v4.dp_daddr, &d_mapped_addr);
 774                 saddr6 = &s_mapped_addr;
 775                 daddr6 = &d_mapped_addr;
 776         }
 777
 778         rdsdebug("saddr %pI6c daddr %pI6c RDSv%u.%u lguid 0x%llx fguid 0x%llx, tos:%d\n",
 779                  saddr6, daddr6, RDS_PROTOCOL_MAJOR(version),
 780                  RDS_PROTOCOL_MINOR(version),
 781                  (unsigned long long)be64_to_cpu(lguid),
 782                  (unsigned long long)be64_to_cpu(fguid), dp_cmn->ricpc_dp_toss);
 783
 784         /* RDS/IB is not currently netns aware, thus init_net */
 785         conn = rds_conn_create(&init_net, daddr6, saddr6,
 786                                &rds_ib_transport, dp_cmn->ricpc_dp_toss,
 787                                GFP_KERNEL, ifindex);
 788         if (IS_ERR(conn)) {
 789                 rdsdebug("rds_conn_create failed (%ld)\n", PTR_ERR(conn));
 790                 conn = NULL;
 791                 goto out;
 792         }
 793
 794         /*
 795          * The connection request may occur while the
 796          * previous connection exist, e.g. in case of failover.
 797          * But as connections may be initiated simultaneously
 798          * by both hosts, we have a random backoff mechanism -
 799          * see the comment above rds_queue_reconnect()
 800          */
 801         mutex_lock(&conn->c_cm_lock);
 802         if (!rds_conn_transition(conn, RDS_CONN_DOWN, RDS_CONN_CONNECTING)) {
 803                 if (rds_conn_state(conn) == RDS_CONN_UP) {
 804                         rdsdebug("incoming connect while connecting\n");
 805                         rds_conn_drop(conn);
 806                         rds_ib_stats_inc(s_ib_listen_closed_stale);
 807                 } else
 808                 if (rds_conn_state(conn) == RDS_CONN_CONNECTING) {
 809                         /* Wait and see - our connect may still be succeeding */
 810                         rds_ib_stats_inc(s_ib_connect_raced);
 811                 }
 812                 goto out;
 813         }
 814
 815         ic = conn->c_transport_data;
 816
 817         rds_ib_set_protocol(conn, version);
 818         rds_ib_set_flow_control(conn, be32_to_cpu(dp_cmn->ricpc_credit));
 819
 820         /* If the peer gave us the last packet it saw, process this as if
 821          * we had received a regular ACK. */
 822         if (dp_cmn->ricpc_ack_seq)
 823                 rds_send_drop_acked(conn, be64_to_cpu(dp_cmn->ricpc_ack_seq),
 824                                     NULL);
 825
 826         BUG_ON(cm_id->context);
 827         BUG_ON(ic->i_cm_id);
 828
 829         ic->i_cm_id = cm_id;
 830         cm_id->context = conn;
 831
 832         /* We got halfway through setting up the ib_connection, if we
 833          * fail now, we have to take the long route out of this mess. */
 834         destroy = 0;
 835
 836         err = rds_ib_setup_qp(conn);
 837         if (err) {
 838                 rds_ib_conn_error(conn, "rds_ib_setup_qp failed (%d)\n", err);
 839                 goto out;
 840         }
 841
 842         rds_ib_cm_fill_conn_param(conn, &conn_param, &dp_rep, version,
 843                                   event->param.conn.responder_resources,
 844                                   event->param.conn.initiator_depth, isv6);
 845
 846         /* rdma_accept() calls rdma_reject() internally if it fails */
 847         if (rdma_accept(cm_id, &conn_param))
 848                 rds_ib_conn_error(conn, "rdma_accept failed\n");
 849
 850 out:
 851         if (conn)
 852                 mutex_unlock(&conn->c_cm_lock);
 853         if (err)
 854                 rdma_reject(cm_id, &err, sizeof(int));
 855         return destroy;
 856 }
 857
 858
 859 int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id, bool isv6)
 860 {
 861         struct rds_connection *conn = cm_id->context;
 862         struct rds_ib_connection *ic = conn->c_transport_data;
 863         struct rdma_conn_param conn_param;
 864         union rds_ib_conn_priv dp;
 865         int ret;
 866
 867         /* If the peer doesn't do protocol negotiation, we must
 868          * default to RDSv3.0 */
 869         rds_ib_set_protocol(conn, RDS_PROTOCOL_4_1);
 870         ic->i_flowctl = rds_ib_sysctl_flow_control;     /* advertise flow control */
 871
 872         ret = rds_ib_setup_qp(conn);
 873         if (ret) {
 874                 rds_ib_conn_error(conn, "rds_ib_setup_qp failed (%d)\n", ret);
 875                 goto out;
 876         }
 877
 878         rds_ib_cm_fill_conn_param(conn, &conn_param, &dp,
 879                                   conn->c_proposed_version,
 880                                   UINT_MAX, UINT_MAX, isv6);
 881         ret = rdma_connect(cm_id, &conn_param);
 882         if (ret)
 883                 rds_ib_conn_error(conn, "rdma_connect failed (%d)\n", ret);
 884
 885 out:
 886         /* Beware - returning non-zero tells the rdma_cm to destroy
 887          * the cm_id. We should certainly not do it as long as we still
 888          * "own" the cm_id. */
 889         if (ret) {
 890                 if (ic->i_cm_id == cm_id)
 891                         ret = 0;
 892         }
 893         ic->i_active_side = true;
 894         return ret;
 895 }
 896
 897 int rds_ib_conn_path_connect(struct rds_conn_path *cp)
 898 {
 899         struct rds_connection *conn = cp->cp_conn;
 900         struct sockaddr_storage src, dest;
 901         rdma_cm_event_handler handler;
 902         struct rds_ib_connection *ic;
 903         int ret;
 904
 905         ic = conn->c_transport_data;
 906
 907         /* XXX I wonder what affect the port space has */
 908         /* delegate cm event handler to rdma_transport */
 909 #if IS_ENABLED(CONFIG_IPV6)
 910         if (conn->c_isv6)
 911                 handler = rds6_rdma_cm_event_handler;
 912         else
 913 #endif
 914                 handler = rds_rdma_cm_event_handler;
 915         ic->i_cm_id = rdma_create_id(&init_net, handler, conn,
 916                                      RDMA_PS_TCP, IB_QPT_RC);
 917         if (IS_ERR(ic->i_cm_id)) {
 918                 ret = PTR_ERR(ic->i_cm_id);
 919                 ic->i_cm_id = NULL;
 920                 rdsdebug("rdma_create_id() failed: %d\n", ret);
 921                 goto out;
 922         }
 923
 924         rdsdebug("created cm id %p for conn %p\n", ic->i_cm_id, conn);
 925
 926         if (ipv6_addr_v4mapped(&conn->c_faddr)) {
 927                 struct sockaddr_in *sin;
 928
 929                 sin = (struct sockaddr_in *)&src;
 930                 sin->sin_family = AF_INET;
 931                 sin->sin_addr.s_addr = conn->c_laddr.s6_addr32[3];
 932                 sin->sin_port = 0;
 933
 934                 sin = (struct sockaddr_in *)&dest;
 935                 sin->sin_family = AF_INET;
 936                 sin->sin_addr.s_addr = conn->c_faddr.s6_addr32[3];
 937                 sin->sin_port = htons(RDS_PORT);
 938         } else {
 939                 struct sockaddr_in6 *sin6;
 940
 941                 sin6 = (struct sockaddr_in6 *)&src;
 942                 sin6->sin6_family = AF_INET6;
 943                 sin6->sin6_addr = conn->c_laddr;
 944                 sin6->sin6_port = 0;
 945                 sin6->sin6_scope_id = conn->c_dev_if;
 946
 947                 sin6 = (struct sockaddr_in6 *)&dest;
 948                 sin6->sin6_family = AF_INET6;
 949                 sin6->sin6_addr = conn->c_faddr;
 950                 sin6->sin6_port = htons(RDS_CM_PORT);
 951                 sin6->sin6_scope_id = conn->c_dev_if;
 952         }
 953
 954         ret = rdma_resolve_addr(ic->i_cm_id, (struct sockaddr *)&src,
 955                                 (struct sockaddr *)&dest,
 956                                 RDS_RDMA_RESOLVE_TIMEOUT_MS);
 957         if (ret) {
 958                 rdsdebug("addr resolve failed for cm id %p: %d\n", ic->i_cm_id,
 959                          ret);
 960                 rdma_destroy_id(ic->i_cm_id);
 961                 ic->i_cm_id = NULL;
 962         }
 963
 964 out:
 965         return ret;
 966 }
 967
 968 /*
 969  * This is so careful about only cleaning up resources that were built up
 970  * so that it can be called at any point during startup.  In fact it
 971  * can be called multiple times for a given connection.
 972  */
 973 void rds_ib_conn_path_shutdown(struct rds_conn_path *cp)
 974 {
 975         struct rds_connection *conn = cp->cp_conn;
 976         struct rds_ib_connection *ic = conn->c_transport_data;
 977         int err = 0;
 978
 979         rdsdebug("cm %p pd %p cq %p %p qp %p\n", ic->i_cm_id,
 980                  ic->i_pd, ic->i_send_cq, ic->i_recv_cq,
 981                  ic->i_cm_id ? ic->i_cm_id->qp : NULL);
 982
 983         if (ic->i_cm_id) {
 984                 struct ib_device *dev = ic->i_cm_id->device;
 985
 986                 rdsdebug("disconnecting cm %p\n", ic->i_cm_id);
 987                 err = rdma_disconnect(ic->i_cm_id);
 988                 if (err) {
 989                         /* Actually this may happen quite frequently, when
 990                          * an outgoing connect raced with an incoming connect.
 991                          */
 992                         rdsdebug("failed to disconnect, cm: %p err %d\n",
 993                                 ic->i_cm_id, err);
 994                 }
 995
 996                 /*
 997                  * We want to wait for tx and rx completion to finish
 998                  * before we tear down the connection, but we have to be
 999                  * careful not to get stuck waiting on a send ring that
1000                  * only has unsignaled sends in it.  We've shutdown new
1001                  * sends before getting here so by waiting for signaled
1002                  * sends to complete we're ensured that there will be no
1003                  * more tx processing.
1004                  */
1005                 wait_event(rds_ib_ring_empty_wait,
1006                            rds_ib_ring_empty(&ic->i_recv_ring) &&
1007                            (atomic_read(&ic->i_signaled_sends) == 0) &&
1008                            (atomic_read(&ic->i_fastreg_wrs) == RDS_IB_DEFAULT_FR_WR));
1009                 tasklet_kill(&ic->i_send_tasklet);
1010                 tasklet_kill(&ic->i_recv_tasklet);
1011
1012                 atomic_set(&ic->i_cq_quiesce, 1);
1013
1014                 /* first destroy the ib state that generates callbacks */
1015                 if (ic->i_cm_id->qp)
1016                         rdma_destroy_qp(ic->i_cm_id);
1017                 if (ic->i_send_cq) {
1018                         if (ic->rds_ibdev)
1019                                 ibdev_put_vector(ic->rds_ibdev, ic->i_scq_vector);
1020                         ib_destroy_cq(ic->i_send_cq);
1021                 }
1022
1023                 if (ic->i_recv_cq) {
1024                         if (ic->rds_ibdev)
1025                                 ibdev_put_vector(ic->rds_ibdev, ic->i_rcq_vector);
1026                         ib_destroy_cq(ic->i_recv_cq);
1027                 }
1028
1029                 /* then free the resources that ib callbacks use */
1030                 if (ic->i_send_hdrs)
1031                         ib_dma_free_coherent(dev,
1032                                            ic->i_send_ring.w_nr *
1033                                                 sizeof(struct rds_header),
1034                                            ic->i_send_hdrs,
1035                                            ic->i_send_hdrs_dma);
1036
1037                 if (ic->i_recv_hdrs)
1038                         ib_dma_free_coherent(dev,
1039                                            ic->i_recv_ring.w_nr *
1040                                                 sizeof(struct rds_header),
1041                                            ic->i_recv_hdrs,
1042                                            ic->i_recv_hdrs_dma);
1043
1044                 if (ic->i_ack)
1045                         ib_dma_free_coherent(dev, sizeof(struct rds_header),
1046                                              ic->i_ack, ic->i_ack_dma);
1047
1048                 if (ic->i_sends)
1049                         rds_ib_send_clear_ring(ic);
1050                 if (ic->i_recvs)
1051                         rds_ib_recv_clear_ring(ic);
1052
1053                 rdma_destroy_id(ic->i_cm_id);
1054
1055                 /*
1056                  * Move connection back to the nodev list.
1057                  */
1058                 if (ic->rds_ibdev)
1059                         rds_ib_remove_conn(ic->rds_ibdev, conn);
1060
1061                 ic->i_cm_id = NULL;
1062                 ic->i_pd = NULL;
1063                 ic->i_send_cq = NULL;
1064                 ic->i_recv_cq = NULL;
1065                 ic->i_send_hdrs = NULL;
1066                 ic->i_recv_hdrs = NULL;
1067                 ic->i_ack = NULL;
1068         }
1069         BUG_ON(ic->rds_ibdev);
1070
1071         /* Clear pending transmit */
1072         if (ic->i_data_op) {
1073                 struct rds_message *rm;
1074
1075                 rm = container_of(ic->i_data_op, struct rds_message, data);
1076                 rds_message_put(rm);
1077                 ic->i_data_op = NULL;
1078         }
1079
1080         /* Clear the ACK state */
1081         clear_bit(IB_ACK_IN_FLIGHT, &ic->i_ack_flags);
1082 #ifdef KERNEL_HAS_ATOMIC64
1083         atomic64_set(&ic->i_ack_next, 0);
1084 #else
1085         ic->i_ack_next = 0;
1086 #endif
1087         ic->i_ack_recv = 0;
1088
1089         /* Clear flow control state */
1090         ic->i_flowctl = 0;
1091         atomic_set(&ic->i_credits, 0);
1092
1093         rds_ib_ring_init(&ic->i_send_ring, rds_ib_sysctl_max_send_wr);
1094         rds_ib_ring_init(&ic->i_recv_ring, rds_ib_sysctl_max_recv_wr);
1095
1096         if (ic->i_ibinc) {
1097                 rds_inc_put(&ic->i_ibinc->ii_inc);
1098                 ic->i_ibinc = NULL;
1099         }
1100
1101         vfree(ic->i_sends);
1102         ic->i_sends = NULL;
1103         vfree(ic->i_recvs);
1104         ic->i_recvs = NULL;
1105         ic->i_active_side = false;
1106 }
1107
1108 int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp)
1109 {
1110         struct rds_ib_connection *ic;
1111         unsigned long flags;
1112         int ret;
1113
1114         /* XXX too lazy? */
1115         ic = kzalloc(sizeof(struct rds_ib_connection), gfp);
1116         if (!ic)
1117                 return -ENOMEM;
1118
1119         ret = rds_ib_recv_alloc_caches(ic, gfp);
1120         if (ret) {
1121                 kfree(ic);
1122                 return ret;
1123         }
1124
1125         INIT_LIST_HEAD(&ic->ib_node);
1126         tasklet_init(&ic->i_send_tasklet, rds_ib_tasklet_fn_send,
1127                      (unsigned long)ic);
1128         tasklet_init(&ic->i_recv_tasklet, rds_ib_tasklet_fn_recv,
1129                      (unsigned long)ic);
1130         mutex_init(&ic->i_recv_mutex);
1131 #ifndef KERNEL_HAS_ATOMIC64
1132         spin_lock_init(&ic->i_ack_lock);
1133 #endif
1134         atomic_set(&ic->i_signaled_sends, 0);
1135
1136         /*
1137          * rds_ib_conn_shutdown() waits for these to be emptied so they
1138          * must be initialized before it can be called.
1139          */
1140         rds_ib_ring_init(&ic->i_send_ring, rds_ib_sysctl_max_send_wr);
1141         rds_ib_ring_init(&ic->i_recv_ring, rds_ib_sysctl_max_recv_wr);
1142
1143         ic->conn = conn;
1144         conn->c_transport_data = ic;
1145
1146         spin_lock_irqsave(&ib_nodev_conns_lock, flags);
1147         list_add_tail(&ic->ib_node, &ib_nodev_conns);
1148         spin_unlock_irqrestore(&ib_nodev_conns_lock, flags);
1149
1150
1151         rdsdebug("conn %p conn ic %p\n", conn, conn->c_transport_data);
1152         return 0;
1153 }
1154
1155 /*
1156  * Free a connection. Connection must be shut down and not set for reconnect.
1157  */
1158 void rds_ib_conn_free(void *arg)
1159 {
1160         struct rds_ib_connection *ic = arg;
1161         spinlock_t      *lock_ptr;
1162
1163         rdsdebug("ic %p\n", ic);
1164
1165         /*
1166          * Conn is either on a dev's list or on the nodev list.
1167          * A race with shutdown() or connect() would cause problems
1168          * (since rds_ibdev would change) but that should never happen.
1169          */
1170         lock_ptr = ic->rds_ibdev ? &ic->rds_ibdev->spinlock : &ib_nodev_conns_lock;
1171
1172         spin_lock_irq(lock_ptr);
1173         list_del(&ic->ib_node);
1174         spin_unlock_irq(lock_ptr);
1175
1176         rds_ib_recv_free_caches(ic);
1177
1178         kfree(ic);
1179 }
1180
1181
1182 /*
1183  * An error occurred on the connection
1184  */
1185 void
1186 __rds_ib_conn_error(struct rds_connection *conn, const char *fmt, ...)
1187 {
1188         va_list ap;
1189
1190         rds_conn_drop(conn);
1191
1192         va_start(ap, fmt);
1193         vprintk(fmt, ap);
1194         va_end(ap);
1195 }