linux/net/rds/iw_cm.c
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   1/*
   2 * Copyright (c) 2006 Oracle.  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
  39#include "rds.h"
  40#include "iw.h"
  41
  42/*
  43 * Set the selected protocol version
  44 */
  45static void rds_iw_set_protocol(struct rds_connection *conn, unsigned int version)
  46{
  47        conn->c_version = version;
  48}
  49
  50/*
  51 * Set up flow control
  52 */
  53static void rds_iw_set_flow_control(struct rds_connection *conn, u32 credits)
  54{
  55        struct rds_iw_connection *ic = conn->c_transport_data;
  56
  57        if (rds_iw_sysctl_flow_control && credits != 0) {
  58                /* We're doing flow control */
  59                ic->i_flowctl = 1;
  60                rds_iw_send_add_credits(conn, credits);
  61        } else {
  62                ic->i_flowctl = 0;
  63        }
  64}
  65
  66/*
  67 * Connection established.
  68 * We get here for both outgoing and incoming connection.
  69 */
  70void rds_iw_cm_connect_complete(struct rds_connection *conn, struct rdma_cm_event *event)
  71{
  72        const struct rds_iw_connect_private *dp = NULL;
  73        struct rds_iw_connection *ic = conn->c_transport_data;
  74        struct rds_iw_device *rds_iwdev;
  75        int err;
  76
  77        if (event->param.conn.private_data_len) {
  78                dp = event->param.conn.private_data;
  79
  80                rds_iw_set_protocol(conn,
  81                                RDS_PROTOCOL(dp->dp_protocol_major,
  82                                        dp->dp_protocol_minor));
  83                rds_iw_set_flow_control(conn, be32_to_cpu(dp->dp_credit));
  84        }
  85
  86        /* update ib_device with this local ipaddr & conn */
  87        rds_iwdev = ib_get_client_data(ic->i_cm_id->device, &rds_iw_client);
  88        err = rds_iw_update_cm_id(rds_iwdev, ic->i_cm_id);
  89        if (err)
  90                printk(KERN_ERR "rds_iw_update_ipaddr failed (%d)\n", err);
  91        rds_iw_add_conn(rds_iwdev, conn);
  92
  93        /* If the peer gave us the last packet it saw, process this as if
  94         * we had received a regular ACK. */
  95        if (dp && dp->dp_ack_seq)
  96                rds_send_drop_acked(conn, be64_to_cpu(dp->dp_ack_seq), NULL);
  97
  98        printk(KERN_NOTICE "RDS/IW: connected to %pI4<->%pI4 version %u.%u%s\n",
  99                        &conn->c_laddr, &conn->c_faddr,
 100                        RDS_PROTOCOL_MAJOR(conn->c_version),
 101                        RDS_PROTOCOL_MINOR(conn->c_version),
 102                        ic->i_flowctl ? ", flow control" : "");
 103
 104        rds_connect_complete(conn);
 105}
 106
 107static void rds_iw_cm_fill_conn_param(struct rds_connection *conn,
 108                        struct rdma_conn_param *conn_param,
 109                        struct rds_iw_connect_private *dp,
 110                        u32 protocol_version)
 111{
 112        struct rds_iw_connection *ic = conn->c_transport_data;
 113
 114        memset(conn_param, 0, sizeof(struct rdma_conn_param));
 115        /* XXX tune these? */
 116        conn_param->responder_resources = 1;
 117        conn_param->initiator_depth = 1;
 118
 119        if (dp) {
 120                memset(dp, 0, sizeof(*dp));
 121                dp->dp_saddr = conn->c_laddr;
 122                dp->dp_daddr = conn->c_faddr;
 123                dp->dp_protocol_major = RDS_PROTOCOL_MAJOR(protocol_version);
 124                dp->dp_protocol_minor = RDS_PROTOCOL_MINOR(protocol_version);
 125                dp->dp_protocol_minor_mask = cpu_to_be16(RDS_IW_SUPPORTED_PROTOCOLS);
 126                dp->dp_ack_seq = rds_iw_piggyb_ack(ic);
 127
 128                /* Advertise flow control */
 129                if (ic->i_flowctl) {
 130                        unsigned int credits;
 131
 132                        credits = IB_GET_POST_CREDITS(atomic_read(&ic->i_credits));
 133                        dp->dp_credit = cpu_to_be32(credits);
 134                        atomic_sub(IB_SET_POST_CREDITS(credits), &ic->i_credits);
 135                }
 136
 137                conn_param->private_data = dp;
 138                conn_param->private_data_len = sizeof(*dp);
 139        }
 140}
 141
 142static void rds_iw_cq_event_handler(struct ib_event *event, void *data)
 143{
 144        rdsdebug("event %u data %p\n", event->event, data);
 145}
 146
 147static void rds_iw_qp_event_handler(struct ib_event *event, void *data)
 148{
 149        struct rds_connection *conn = data;
 150        struct rds_iw_connection *ic = conn->c_transport_data;
 151
 152        rdsdebug("conn %p ic %p event %u\n", conn, ic, event->event);
 153
 154        switch (event->event) {
 155        case IB_EVENT_COMM_EST:
 156                rdma_notify(ic->i_cm_id, IB_EVENT_COMM_EST);
 157                break;
 158        case IB_EVENT_QP_REQ_ERR:
 159        case IB_EVENT_QP_FATAL:
 160        default:
 161                rdsdebug("Fatal QP Event %u "
 162                        "- connection %pI4->%pI4, reconnecting\n",
 163                        event->event, &conn->c_laddr,
 164                        &conn->c_faddr);
 165                rds_conn_drop(conn);
 166                break;
 167        }
 168}
 169
 170/*
 171 * Create a QP
 172 */
 173static int rds_iw_init_qp_attrs(struct ib_qp_init_attr *attr,
 174                struct rds_iw_device *rds_iwdev,
 175                struct rds_iw_work_ring *send_ring,
 176                void (*send_cq_handler)(struct ib_cq *, void *),
 177                struct rds_iw_work_ring *recv_ring,
 178                void (*recv_cq_handler)(struct ib_cq *, void *),
 179                void *context)
 180{
 181        struct ib_device *dev = rds_iwdev->dev;
 182        unsigned int send_size, recv_size;
 183        int ret;
 184
 185        /* The offset of 1 is to accommodate the additional ACK WR. */
 186        send_size = min_t(unsigned int, rds_iwdev->max_wrs, rds_iw_sysctl_max_send_wr + 1);
 187        recv_size = min_t(unsigned int, rds_iwdev->max_wrs, rds_iw_sysctl_max_recv_wr + 1);
 188        rds_iw_ring_resize(send_ring, send_size - 1);
 189        rds_iw_ring_resize(recv_ring, recv_size - 1);
 190
 191        memset(attr, 0, sizeof(*attr));
 192        attr->event_handler = rds_iw_qp_event_handler;
 193        attr->qp_context = context;
 194        attr->cap.max_send_wr = send_size;
 195        attr->cap.max_recv_wr = recv_size;
 196        attr->cap.max_send_sge = rds_iwdev->max_sge;
 197        attr->cap.max_recv_sge = RDS_IW_RECV_SGE;
 198        attr->sq_sig_type = IB_SIGNAL_REQ_WR;
 199        attr->qp_type = IB_QPT_RC;
 200
 201        attr->send_cq = ib_create_cq(dev, send_cq_handler,
 202                                     rds_iw_cq_event_handler,
 203                                     context, send_size, 0);
 204        if (IS_ERR(attr->send_cq)) {
 205                ret = PTR_ERR(attr->send_cq);
 206                attr->send_cq = NULL;
 207                rdsdebug("ib_create_cq send failed: %d\n", ret);
 208                goto out;
 209        }
 210
 211        attr->recv_cq = ib_create_cq(dev, recv_cq_handler,
 212                                     rds_iw_cq_event_handler,
 213                                     context, recv_size, 0);
 214        if (IS_ERR(attr->recv_cq)) {
 215                ret = PTR_ERR(attr->recv_cq);
 216                attr->recv_cq = NULL;
 217                rdsdebug("ib_create_cq send failed: %d\n", ret);
 218                goto out;
 219        }
 220
 221        ret = ib_req_notify_cq(attr->send_cq, IB_CQ_NEXT_COMP);
 222        if (ret) {
 223                rdsdebug("ib_req_notify_cq send failed: %d\n", ret);
 224                goto out;
 225        }
 226
 227        ret = ib_req_notify_cq(attr->recv_cq, IB_CQ_SOLICITED);
 228        if (ret) {
 229                rdsdebug("ib_req_notify_cq recv failed: %d\n", ret);
 230                goto out;
 231        }
 232
 233out:
 234        if (ret) {
 235                if (attr->send_cq)
 236                        ib_destroy_cq(attr->send_cq);
 237                if (attr->recv_cq)
 238                        ib_destroy_cq(attr->recv_cq);
 239        }
 240        return ret;
 241}
 242
 243/*
 244 * This needs to be very careful to not leave IS_ERR pointers around for
 245 * cleanup to trip over.
 246 */
 247static int rds_iw_setup_qp(struct rds_connection *conn)
 248{
 249        struct rds_iw_connection *ic = conn->c_transport_data;
 250        struct ib_device *dev = ic->i_cm_id->device;
 251        struct ib_qp_init_attr attr;
 252        struct rds_iw_device *rds_iwdev;
 253        int ret;
 254
 255        /* rds_iw_add_one creates a rds_iw_device object per IB device,
 256         * and allocates a protection domain, memory range and MR pool
 257         * for each.  If that fails for any reason, it will not register
 258         * the rds_iwdev at all.
 259         */
 260        rds_iwdev = ib_get_client_data(dev, &rds_iw_client);
 261        if (!rds_iwdev) {
 262                printk_ratelimited(KERN_NOTICE "RDS/IW: No client_data for device %s\n",
 263                                        dev->name);
 264                return -EOPNOTSUPP;
 265        }
 266
 267        /* Protection domain and memory range */
 268        ic->i_pd = rds_iwdev->pd;
 269        ic->i_mr = rds_iwdev->mr;
 270
 271        ret = rds_iw_init_qp_attrs(&attr, rds_iwdev,
 272                        &ic->i_send_ring, rds_iw_send_cq_comp_handler,
 273                        &ic->i_recv_ring, rds_iw_recv_cq_comp_handler,
 274                        conn);
 275        if (ret < 0)
 276                goto out;
 277
 278        ic->i_send_cq = attr.send_cq;
 279        ic->i_recv_cq = attr.recv_cq;
 280
 281        /*
 282         * XXX this can fail if max_*_wr is too large?  Are we supposed
 283         * to back off until we get a value that the hardware can support?
 284         */
 285        ret = rdma_create_qp(ic->i_cm_id, ic->i_pd, &attr);
 286        if (ret) {
 287                rdsdebug("rdma_create_qp failed: %d\n", ret);
 288                goto out;
 289        }
 290
 291        ic->i_send_hdrs = ib_dma_alloc_coherent(dev,
 292                                           ic->i_send_ring.w_nr *
 293                                                sizeof(struct rds_header),
 294                                           &ic->i_send_hdrs_dma, GFP_KERNEL);
 295        if (!ic->i_send_hdrs) {
 296                ret = -ENOMEM;
 297                rdsdebug("ib_dma_alloc_coherent send failed\n");
 298                goto out;
 299        }
 300
 301        ic->i_recv_hdrs = ib_dma_alloc_coherent(dev,
 302                                           ic->i_recv_ring.w_nr *
 303                                                sizeof(struct rds_header),
 304                                           &ic->i_recv_hdrs_dma, GFP_KERNEL);
 305        if (!ic->i_recv_hdrs) {
 306                ret = -ENOMEM;
 307                rdsdebug("ib_dma_alloc_coherent recv failed\n");
 308                goto out;
 309        }
 310
 311        ic->i_ack = ib_dma_alloc_coherent(dev, sizeof(struct rds_header),
 312                                       &ic->i_ack_dma, GFP_KERNEL);
 313        if (!ic->i_ack) {
 314                ret = -ENOMEM;
 315                rdsdebug("ib_dma_alloc_coherent ack failed\n");
 316                goto out;
 317        }
 318
 319        ic->i_sends = vmalloc(ic->i_send_ring.w_nr * sizeof(struct rds_iw_send_work));
 320        if (!ic->i_sends) {
 321                ret = -ENOMEM;
 322                rdsdebug("send allocation failed\n");
 323                goto out;
 324        }
 325        rds_iw_send_init_ring(ic);
 326
 327        ic->i_recvs = vmalloc(ic->i_recv_ring.w_nr * sizeof(struct rds_iw_recv_work));
 328        if (!ic->i_recvs) {
 329                ret = -ENOMEM;
 330                rdsdebug("recv allocation failed\n");
 331                goto out;
 332        }
 333
 334        rds_iw_recv_init_ring(ic);
 335        rds_iw_recv_init_ack(ic);
 336
 337        /* Post receive buffers - as a side effect, this will update
 338         * the posted credit count. */
 339        rds_iw_recv_refill(conn, GFP_KERNEL, GFP_HIGHUSER, 1);
 340
 341        rdsdebug("conn %p pd %p mr %p cq %p %p\n", conn, ic->i_pd, ic->i_mr,
 342                 ic->i_send_cq, ic->i_recv_cq);
 343
 344out:
 345        return ret;
 346}
 347
 348static u32 rds_iw_protocol_compatible(const struct rds_iw_connect_private *dp)
 349{
 350        u16 common;
 351        u32 version = 0;
 352
 353        /* rdma_cm private data is odd - when there is any private data in the
 354         * request, we will be given a pretty large buffer without telling us the
 355         * original size. The only way to tell the difference is by looking at
 356         * the contents, which are initialized to zero.
 357         * If the protocol version fields aren't set, this is a connection attempt
 358         * from an older version. This could could be 3.0 or 2.0 - we can't tell.
 359         * We really should have changed this for OFED 1.3 :-( */
 360        if (dp->dp_protocol_major == 0)
 361                return RDS_PROTOCOL_3_0;
 362
 363        common = be16_to_cpu(dp->dp_protocol_minor_mask) & RDS_IW_SUPPORTED_PROTOCOLS;
 364        if (dp->dp_protocol_major == 3 && common) {
 365                version = RDS_PROTOCOL_3_0;
 366                while ((common >>= 1) != 0)
 367                        version++;
 368        }
 369        printk_ratelimited(KERN_NOTICE "RDS: Connection from %pI4 using "
 370                        "incompatible protocol version %u.%u\n",
 371                        &dp->dp_saddr,
 372                        dp->dp_protocol_major,
 373                        dp->dp_protocol_minor);
 374        return version;
 375}
 376
 377int rds_iw_cm_handle_connect(struct rdma_cm_id *cm_id,
 378                                    struct rdma_cm_event *event)
 379{
 380        const struct rds_iw_connect_private *dp = event->param.conn.private_data;
 381        struct rds_iw_connect_private dp_rep;
 382        struct rds_connection *conn = NULL;
 383        struct rds_iw_connection *ic = NULL;
 384        struct rdma_conn_param conn_param;
 385        struct rds_iw_device *rds_iwdev;
 386        u32 version;
 387        int err, destroy = 1;
 388
 389        /* Check whether the remote protocol version matches ours. */
 390        version = rds_iw_protocol_compatible(dp);
 391        if (!version)
 392                goto out;
 393
 394        rdsdebug("saddr %pI4 daddr %pI4 RDSv%u.%u\n",
 395                 &dp->dp_saddr, &dp->dp_daddr,
 396                 RDS_PROTOCOL_MAJOR(version), RDS_PROTOCOL_MINOR(version));
 397
 398        conn = rds_conn_create(dp->dp_daddr, dp->dp_saddr, &rds_iw_transport,
 399                               GFP_KERNEL);
 400        if (IS_ERR(conn)) {
 401                rdsdebug("rds_conn_create failed (%ld)\n", PTR_ERR(conn));
 402                conn = NULL;
 403                goto out;
 404        }
 405
 406        /*
 407         * The connection request may occur while the
 408         * previous connection exist, e.g. in case of failover.
 409         * But as connections may be initiated simultaneously
 410         * by both hosts, we have a random backoff mechanism -
 411         * see the comment above rds_queue_reconnect()
 412         */
 413        mutex_lock(&conn->c_cm_lock);
 414        if (!rds_conn_transition(conn, RDS_CONN_DOWN, RDS_CONN_CONNECTING)) {
 415                if (rds_conn_state(conn) == RDS_CONN_UP) {
 416                        rdsdebug("incoming connect while connecting\n");
 417                        rds_conn_drop(conn);
 418                        rds_iw_stats_inc(s_iw_listen_closed_stale);
 419                } else
 420                if (rds_conn_state(conn) == RDS_CONN_CONNECTING) {
 421                        /* Wait and see - our connect may still be succeeding */
 422                        rds_iw_stats_inc(s_iw_connect_raced);
 423                }
 424                mutex_unlock(&conn->c_cm_lock);
 425                goto out;
 426        }
 427
 428        ic = conn->c_transport_data;
 429
 430        rds_iw_set_protocol(conn, version);
 431        rds_iw_set_flow_control(conn, be32_to_cpu(dp->dp_credit));
 432
 433        /* If the peer gave us the last packet it saw, process this as if
 434         * we had received a regular ACK. */
 435        if (dp->dp_ack_seq)
 436                rds_send_drop_acked(conn, be64_to_cpu(dp->dp_ack_seq), NULL);
 437
 438        BUG_ON(cm_id->context);
 439        BUG_ON(ic->i_cm_id);
 440
 441        ic->i_cm_id = cm_id;
 442        cm_id->context = conn;
 443
 444        rds_iwdev = ib_get_client_data(cm_id->device, &rds_iw_client);
 445        ic->i_dma_local_lkey = rds_iwdev->dma_local_lkey;
 446
 447        /* We got halfway through setting up the ib_connection, if we
 448         * fail now, we have to take the long route out of this mess. */
 449        destroy = 0;
 450
 451        err = rds_iw_setup_qp(conn);
 452        if (err) {
 453                rds_iw_conn_error(conn, "rds_iw_setup_qp failed (%d)\n", err);
 454                mutex_unlock(&conn->c_cm_lock);
 455                goto out;
 456        }
 457
 458        rds_iw_cm_fill_conn_param(conn, &conn_param, &dp_rep, version);
 459
 460        /* rdma_accept() calls rdma_reject() internally if it fails */
 461        err = rdma_accept(cm_id, &conn_param);
 462        mutex_unlock(&conn->c_cm_lock);
 463        if (err) {
 464                rds_iw_conn_error(conn, "rdma_accept failed (%d)\n", err);
 465                goto out;
 466        }
 467
 468        return 0;
 469
 470out:
 471        rdma_reject(cm_id, NULL, 0);
 472        return destroy;
 473}
 474
 475
 476int rds_iw_cm_initiate_connect(struct rdma_cm_id *cm_id)
 477{
 478        struct rds_connection *conn = cm_id->context;
 479        struct rds_iw_connection *ic = conn->c_transport_data;
 480        struct rdma_conn_param conn_param;
 481        struct rds_iw_connect_private dp;
 482        int ret;
 483
 484        /* If the peer doesn't do protocol negotiation, we must
 485         * default to RDSv3.0 */
 486        rds_iw_set_protocol(conn, RDS_PROTOCOL_3_0);
 487        ic->i_flowctl = rds_iw_sysctl_flow_control;     /* advertise flow control */
 488
 489        ret = rds_iw_setup_qp(conn);
 490        if (ret) {
 491                rds_iw_conn_error(conn, "rds_iw_setup_qp failed (%d)\n", ret);
 492                goto out;
 493        }
 494
 495        rds_iw_cm_fill_conn_param(conn, &conn_param, &dp, RDS_PROTOCOL_VERSION);
 496
 497        ret = rdma_connect(cm_id, &conn_param);
 498        if (ret)
 499                rds_iw_conn_error(conn, "rdma_connect failed (%d)\n", ret);
 500
 501out:
 502        /* Beware - returning non-zero tells the rdma_cm to destroy
 503         * the cm_id. We should certainly not do it as long as we still
 504         * "own" the cm_id. */
 505        if (ret) {
 506                struct rds_iw_connection *ic = conn->c_transport_data;
 507
 508                if (ic->i_cm_id == cm_id)
 509                        ret = 0;
 510        }
 511        return ret;
 512}
 513
 514int rds_iw_conn_connect(struct rds_connection *conn)
 515{
 516        struct rds_iw_connection *ic = conn->c_transport_data;
 517        struct rds_iw_device *rds_iwdev;
 518        struct sockaddr_in src, dest;
 519        int ret;
 520
 521        /* XXX I wonder what affect the port space has */
 522        /* delegate cm event handler to rdma_transport */
 523        ic->i_cm_id = rdma_create_id(rds_rdma_cm_event_handler, conn,
 524                                     RDMA_PS_TCP, IB_QPT_RC);
 525        if (IS_ERR(ic->i_cm_id)) {
 526                ret = PTR_ERR(ic->i_cm_id);
 527                ic->i_cm_id = NULL;
 528                rdsdebug("rdma_create_id() failed: %d\n", ret);
 529                goto out;
 530        }
 531
 532        rdsdebug("created cm id %p for conn %p\n", ic->i_cm_id, conn);
 533
 534        src.sin_family = AF_INET;
 535        src.sin_addr.s_addr = (__force u32)conn->c_laddr;
 536        src.sin_port = (__force u16)htons(0);
 537
 538        /* First, bind to the local address and device. */
 539        ret = rdma_bind_addr(ic->i_cm_id, (struct sockaddr *) &src);
 540        if (ret) {
 541                rdsdebug("rdma_bind_addr(%pI4) failed: %d\n",
 542                                &conn->c_laddr, ret);
 543                rdma_destroy_id(ic->i_cm_id);
 544                ic->i_cm_id = NULL;
 545                goto out;
 546        }
 547
 548        rds_iwdev = ib_get_client_data(ic->i_cm_id->device, &rds_iw_client);
 549        ic->i_dma_local_lkey = rds_iwdev->dma_local_lkey;
 550
 551        dest.sin_family = AF_INET;
 552        dest.sin_addr.s_addr = (__force u32)conn->c_faddr;
 553        dest.sin_port = (__force u16)htons(RDS_PORT);
 554
 555        ret = rdma_resolve_addr(ic->i_cm_id, (struct sockaddr *)&src,
 556                                (struct sockaddr *)&dest,
 557                                RDS_RDMA_RESOLVE_TIMEOUT_MS);
 558        if (ret) {
 559                rdsdebug("addr resolve failed for cm id %p: %d\n", ic->i_cm_id,
 560                         ret);
 561                rdma_destroy_id(ic->i_cm_id);
 562                ic->i_cm_id = NULL;
 563        }
 564
 565out:
 566        return ret;
 567}
 568
 569/*
 570 * This is so careful about only cleaning up resources that were built up
 571 * so that it can be called at any point during startup.  In fact it
 572 * can be called multiple times for a given connection.
 573 */
 574void rds_iw_conn_shutdown(struct rds_connection *conn)
 575{
 576        struct rds_iw_connection *ic = conn->c_transport_data;
 577        int err = 0;
 578        struct ib_qp_attr qp_attr;
 579
 580        rdsdebug("cm %p pd %p cq %p %p qp %p\n", ic->i_cm_id,
 581                 ic->i_pd, ic->i_send_cq, ic->i_recv_cq,
 582                 ic->i_cm_id ? ic->i_cm_id->qp : NULL);
 583
 584        if (ic->i_cm_id) {
 585                struct ib_device *dev = ic->i_cm_id->device;
 586
 587                rdsdebug("disconnecting cm %p\n", ic->i_cm_id);
 588                err = rdma_disconnect(ic->i_cm_id);
 589                if (err) {
 590                        /* Actually this may happen quite frequently, when
 591                         * an outgoing connect raced with an incoming connect.
 592                         */
 593                        rdsdebug("rds_iw_conn_shutdown: failed to disconnect,"
 594                                   " cm: %p err %d\n", ic->i_cm_id, err);
 595                }
 596
 597                if (ic->i_cm_id->qp) {
 598                        qp_attr.qp_state = IB_QPS_ERR;
 599                        ib_modify_qp(ic->i_cm_id->qp, &qp_attr, IB_QP_STATE);
 600                }
 601
 602                wait_event(rds_iw_ring_empty_wait,
 603                        rds_iw_ring_empty(&ic->i_send_ring) &&
 604                        rds_iw_ring_empty(&ic->i_recv_ring));
 605
 606                if (ic->i_send_hdrs)
 607                        ib_dma_free_coherent(dev,
 608                                           ic->i_send_ring.w_nr *
 609                                                sizeof(struct rds_header),
 610                                           ic->i_send_hdrs,
 611                                           ic->i_send_hdrs_dma);
 612
 613                if (ic->i_recv_hdrs)
 614                        ib_dma_free_coherent(dev,
 615                                           ic->i_recv_ring.w_nr *
 616                                                sizeof(struct rds_header),
 617                                           ic->i_recv_hdrs,
 618                                           ic->i_recv_hdrs_dma);
 619
 620                if (ic->i_ack)
 621                        ib_dma_free_coherent(dev, sizeof(struct rds_header),
 622                                             ic->i_ack, ic->i_ack_dma);
 623
 624                if (ic->i_sends)
 625                        rds_iw_send_clear_ring(ic);
 626                if (ic->i_recvs)
 627                        rds_iw_recv_clear_ring(ic);
 628
 629                if (ic->i_cm_id->qp)
 630                        rdma_destroy_qp(ic->i_cm_id);
 631                if (ic->i_send_cq)
 632                        ib_destroy_cq(ic->i_send_cq);
 633                if (ic->i_recv_cq)
 634                        ib_destroy_cq(ic->i_recv_cq);
 635
 636                /*
 637                 * If associated with an rds_iw_device:
 638                 *      Move connection back to the nodev list.
 639                 *      Remove cm_id from the device cm_id list.
 640                 */
 641                if (ic->rds_iwdev)
 642                        rds_iw_remove_conn(ic->rds_iwdev, conn);
 643
 644                rdma_destroy_id(ic->i_cm_id);
 645
 646                ic->i_cm_id = NULL;
 647                ic->i_pd = NULL;
 648                ic->i_mr = NULL;
 649                ic->i_send_cq = NULL;
 650                ic->i_recv_cq = NULL;
 651                ic->i_send_hdrs = NULL;
 652                ic->i_recv_hdrs = NULL;
 653                ic->i_ack = NULL;
 654        }
 655        BUG_ON(ic->rds_iwdev);
 656
 657        /* Clear pending transmit */
 658        if (ic->i_rm) {
 659                rds_message_put(ic->i_rm);
 660                ic->i_rm = NULL;
 661        }
 662
 663        /* Clear the ACK state */
 664        clear_bit(IB_ACK_IN_FLIGHT, &ic->i_ack_flags);
 665#ifdef KERNEL_HAS_ATOMIC64
 666        atomic64_set(&ic->i_ack_next, 0);
 667#else
 668        ic->i_ack_next = 0;
 669#endif
 670        ic->i_ack_recv = 0;
 671
 672        /* Clear flow control state */
 673        ic->i_flowctl = 0;
 674        atomic_set(&ic->i_credits, 0);
 675
 676        rds_iw_ring_init(&ic->i_send_ring, rds_iw_sysctl_max_send_wr);
 677        rds_iw_ring_init(&ic->i_recv_ring, rds_iw_sysctl_max_recv_wr);
 678
 679        if (ic->i_iwinc) {
 680                rds_inc_put(&ic->i_iwinc->ii_inc);
 681                ic->i_iwinc = NULL;
 682        }
 683
 684        vfree(ic->i_sends);
 685        ic->i_sends = NULL;
 686        vfree(ic->i_recvs);
 687        ic->i_recvs = NULL;
 688        rdsdebug("shutdown complete\n");
 689}
 690
 691int rds_iw_conn_alloc(struct rds_connection *conn, gfp_t gfp)
 692{
 693        struct rds_iw_connection *ic;
 694        unsigned long flags;
 695
 696        /* XXX too lazy? */
 697        ic = kzalloc(sizeof(struct rds_iw_connection), gfp);
 698        if (!ic)
 699                return -ENOMEM;
 700
 701        INIT_LIST_HEAD(&ic->iw_node);
 702        tasklet_init(&ic->i_recv_tasklet, rds_iw_recv_tasklet_fn,
 703                     (unsigned long) ic);
 704        mutex_init(&ic->i_recv_mutex);
 705#ifndef KERNEL_HAS_ATOMIC64
 706        spin_lock_init(&ic->i_ack_lock);
 707#endif
 708
 709        /*
 710         * rds_iw_conn_shutdown() waits for these to be emptied so they
 711         * must be initialized before it can be called.
 712         */
 713        rds_iw_ring_init(&ic->i_send_ring, rds_iw_sysctl_max_send_wr);
 714        rds_iw_ring_init(&ic->i_recv_ring, rds_iw_sysctl_max_recv_wr);
 715
 716        ic->conn = conn;
 717        conn->c_transport_data = ic;
 718
 719        spin_lock_irqsave(&iw_nodev_conns_lock, flags);
 720        list_add_tail(&ic->iw_node, &iw_nodev_conns);
 721        spin_unlock_irqrestore(&iw_nodev_conns_lock, flags);
 722
 723
 724        rdsdebug("conn %p conn ic %p\n", conn, conn->c_transport_data);
 725        return 0;
 726}
 727
 728/*
 729 * Free a connection. Connection must be shut down and not set for reconnect.
 730 */
 731void rds_iw_conn_free(void *arg)
 732{
 733        struct rds_iw_connection *ic = arg;
 734        spinlock_t      *lock_ptr;
 735
 736        rdsdebug("ic %p\n", ic);
 737
 738        /*
 739         * Conn is either on a dev's list or on the nodev list.
 740         * A race with shutdown() or connect() would cause problems
 741         * (since rds_iwdev would change) but that should never happen.
 742         */
 743        lock_ptr = ic->rds_iwdev ? &ic->rds_iwdev->spinlock : &iw_nodev_conns_lock;
 744
 745        spin_lock_irq(lock_ptr);
 746        list_del(&ic->iw_node);
 747        spin_unlock_irq(lock_ptr);
 748
 749        kfree(ic);
 750}
 751
 752/*
 753 * An error occurred on the connection
 754 */
 755void
 756__rds_iw_conn_error(struct rds_connection *conn, const char *fmt, ...)
 757{
 758        va_list ap;
 759
 760        rds_conn_drop(conn);
 761
 762        va_start(ap, fmt);
 763        vprintk(fmt, ap);
 764        va_end(ap);
 765}
 766
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