linux/net/rds/rdma_transport.c
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   1/*
   2 * Copyright (c) 2009 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/module.h>
  34#include <rdma/rdma_cm.h>
  35
  36#include "rdma_transport.h"
  37
  38static struct rdma_cm_id *rds_rdma_listen_id;
  39
  40static char *rds_cm_event_strings[] = {
  41#define RDS_CM_EVENT_STRING(foo) \
  42                [RDMA_CM_EVENT_##foo] = __stringify(RDMA_CM_EVENT_##foo)
  43        RDS_CM_EVENT_STRING(ADDR_RESOLVED),
  44        RDS_CM_EVENT_STRING(ADDR_ERROR),
  45        RDS_CM_EVENT_STRING(ROUTE_RESOLVED),
  46        RDS_CM_EVENT_STRING(ROUTE_ERROR),
  47        RDS_CM_EVENT_STRING(CONNECT_REQUEST),
  48        RDS_CM_EVENT_STRING(CONNECT_RESPONSE),
  49        RDS_CM_EVENT_STRING(CONNECT_ERROR),
  50        RDS_CM_EVENT_STRING(UNREACHABLE),
  51        RDS_CM_EVENT_STRING(REJECTED),
  52        RDS_CM_EVENT_STRING(ESTABLISHED),
  53        RDS_CM_EVENT_STRING(DISCONNECTED),
  54        RDS_CM_EVENT_STRING(DEVICE_REMOVAL),
  55        RDS_CM_EVENT_STRING(MULTICAST_JOIN),
  56        RDS_CM_EVENT_STRING(MULTICAST_ERROR),
  57        RDS_CM_EVENT_STRING(ADDR_CHANGE),
  58        RDS_CM_EVENT_STRING(TIMEWAIT_EXIT),
  59#undef RDS_CM_EVENT_STRING
  60};
  61
  62static char *rds_cm_event_str(enum rdma_cm_event_type type)
  63{
  64        return rds_str_array(rds_cm_event_strings,
  65                             ARRAY_SIZE(rds_cm_event_strings), type);
  66};
  67
  68int rds_rdma_cm_event_handler(struct rdma_cm_id *cm_id,
  69                              struct rdma_cm_event *event)
  70{
  71        /* this can be null in the listening path */
  72        struct rds_connection *conn = cm_id->context;
  73        struct rds_transport *trans;
  74        int ret = 0;
  75
  76        rdsdebug("conn %p id %p handling event %u (%s)\n", conn, cm_id,
  77                 event->event, rds_cm_event_str(event->event));
  78
  79        if (cm_id->device->node_type == RDMA_NODE_RNIC)
  80                trans = &rds_iw_transport;
  81        else
  82                trans = &rds_ib_transport;
  83
  84        /* Prevent shutdown from tearing down the connection
  85         * while we're executing. */
  86        if (conn) {
  87                mutex_lock(&conn->c_cm_lock);
  88
  89                /* If the connection is being shut down, bail out
  90                 * right away. We return 0 so cm_id doesn't get
  91                 * destroyed prematurely */
  92                if (rds_conn_state(conn) == RDS_CONN_DISCONNECTING) {
  93                        /* Reject incoming connections while we're tearing
  94                         * down an existing one. */
  95                        if (event->event == RDMA_CM_EVENT_CONNECT_REQUEST)
  96                                ret = 1;
  97                        goto out;
  98                }
  99        }
 100
 101        switch (event->event) {
 102        case RDMA_CM_EVENT_CONNECT_REQUEST:
 103                ret = trans->cm_handle_connect(cm_id, event);
 104                break;
 105
 106        case RDMA_CM_EVENT_ADDR_RESOLVED:
 107                /* XXX do we need to clean up if this fails? */
 108                ret = rdma_resolve_route(cm_id,
 109                                         RDS_RDMA_RESOLVE_TIMEOUT_MS);
 110                break;
 111
 112        case RDMA_CM_EVENT_ROUTE_RESOLVED:
 113                /* XXX worry about racing with listen acceptance */
 114                ret = trans->cm_initiate_connect(cm_id);
 115                break;
 116
 117        case RDMA_CM_EVENT_ESTABLISHED:
 118                trans->cm_connect_complete(conn, event);
 119                break;
 120
 121        case RDMA_CM_EVENT_ADDR_ERROR:
 122        case RDMA_CM_EVENT_ROUTE_ERROR:
 123        case RDMA_CM_EVENT_CONNECT_ERROR:
 124        case RDMA_CM_EVENT_UNREACHABLE:
 125        case RDMA_CM_EVENT_REJECTED:
 126        case RDMA_CM_EVENT_DEVICE_REMOVAL:
 127        case RDMA_CM_EVENT_ADDR_CHANGE:
 128                if (conn)
 129                        rds_conn_drop(conn);
 130                break;
 131
 132        case RDMA_CM_EVENT_DISCONNECTED:
 133                rdsdebug("DISCONNECT event - dropping connection "
 134                        "%pI4->%pI4\n", &conn->c_laddr,
 135                         &conn->c_faddr);
 136                rds_conn_drop(conn);
 137                break;
 138
 139        default:
 140                /* things like device disconnect? */
 141                printk(KERN_ERR "RDS: unknown event %u (%s)!\n",
 142                       event->event, rds_cm_event_str(event->event));
 143                break;
 144        }
 145
 146out:
 147        if (conn)
 148                mutex_unlock(&conn->c_cm_lock);
 149
 150        rdsdebug("id %p event %u (%s) handling ret %d\n", cm_id, event->event,
 151                 rds_cm_event_str(event->event), ret);
 152
 153        return ret;
 154}
 155
 156static int rds_rdma_listen_init(void)
 157{
 158        struct sockaddr_in sin;
 159        struct rdma_cm_id *cm_id;
 160        int ret;
 161
 162        cm_id = rdma_create_id(rds_rdma_cm_event_handler, NULL, RDMA_PS_TCP,
 163                               IB_QPT_RC);
 164        if (IS_ERR(cm_id)) {
 165                ret = PTR_ERR(cm_id);
 166                printk(KERN_ERR "RDS/RDMA: failed to setup listener, "
 167                       "rdma_create_id() returned %d\n", ret);
 168                return ret;
 169        }
 170
 171        sin.sin_family = AF_INET,
 172        sin.sin_addr.s_addr = (__force u32)htonl(INADDR_ANY);
 173        sin.sin_port = (__force u16)htons(RDS_PORT);
 174
 175        /*
 176         * XXX I bet this binds the cm_id to a device.  If we want to support
 177         * fail-over we'll have to take this into consideration.
 178         */
 179        ret = rdma_bind_addr(cm_id, (struct sockaddr *)&sin);
 180        if (ret) {
 181                printk(KERN_ERR "RDS/RDMA: failed to setup listener, "
 182                       "rdma_bind_addr() returned %d\n", ret);
 183                goto out;
 184        }
 185
 186        ret = rdma_listen(cm_id, 128);
 187        if (ret) {
 188                printk(KERN_ERR "RDS/RDMA: failed to setup listener, "
 189                       "rdma_listen() returned %d\n", ret);
 190                goto out;
 191        }
 192
 193        rdsdebug("cm %p listening on port %u\n", cm_id, RDS_PORT);
 194
 195        rds_rdma_listen_id = cm_id;
 196        cm_id = NULL;
 197out:
 198        if (cm_id)
 199                rdma_destroy_id(cm_id);
 200        return ret;
 201}
 202
 203static void rds_rdma_listen_stop(void)
 204{
 205        if (rds_rdma_listen_id) {
 206                rdsdebug("cm %p\n", rds_rdma_listen_id);
 207                rdma_destroy_id(rds_rdma_listen_id);
 208                rds_rdma_listen_id = NULL;
 209        }
 210}
 211
 212static int rds_rdma_init(void)
 213{
 214        int ret;
 215
 216        ret = rds_rdma_listen_init();
 217        if (ret)
 218                goto out;
 219
 220        ret = rds_iw_init();
 221        if (ret)
 222                goto err_iw_init;
 223
 224        ret = rds_ib_init();
 225        if (ret)
 226                goto err_ib_init;
 227
 228        goto out;
 229
 230err_ib_init:
 231        rds_iw_exit();
 232err_iw_init:
 233        rds_rdma_listen_stop();
 234out:
 235        return ret;
 236}
 237module_init(rds_rdma_init);
 238
 239static void rds_rdma_exit(void)
 240{
 241        /* stop listening first to ensure no new connections are attempted */
 242        rds_rdma_listen_stop();
 243        rds_ib_exit();
 244        rds_iw_exit();
 245}
 246module_exit(rds_rdma_exit);
 247
 248MODULE_AUTHOR("Oracle Corporation <rds-devel@oss.oracle.com>");
 249MODULE_DESCRIPTION("RDS: IB/iWARP transport");
 250MODULE_LICENSE("Dual BSD/GPL");
 251
 252
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