ceph/src/spdk/lib/iscsi/acceptor.c

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  *   Copyright (C) 2008-2012 Daisuke Aoyama <aoyama@peach.ne.jp>.
   5  *   Copyright (c) Intel Corporation.
   6  *   All rights reserved.
   7  *
   8  *   Redistribution and use in source and binary forms, with or without
   9  *   modification, are permitted provided that the following conditions
  10  *   are met:
  11  *
  12  *     * Redistributions of source code must retain the above copyright
  13  *       notice, this list of conditions and the following disclaimer.
  14  *     * Redistributions in binary form must reproduce the above copyright
  15  *       notice, this list of conditions and the following disclaimer in
  16  *       the documentation and/or other materials provided with the
  17  *       distribution.
  18  *     * Neither the name of Intel Corporation nor the names of its
  19  *       contributors may be used to endorse or promote products derived
  20  *       from this software without specific prior written permission.
  21  *
  22  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  23  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  24  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  25  *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  26  *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  27  *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  28  *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  29  *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  30  *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  31  *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  32  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 #include <errno.h>
  36 #include <string.h>
  37 #include <unistd.h>
  38
  39 #include <sys/types.h>
  40
  41 #include "spdk/env.h"
  42 #include "spdk/event.h"
  43 #include "spdk/log.h"
  44 #include "spdk/net.h"
  45 #include "iscsi/acceptor.h"
  46 #include "iscsi/conn.h"
  47 #include "iscsi/portal_grp.h"
  48
  49 #define ACCEPT_TIMEOUT_US 1000 /* 1ms */
  50
  51 static struct spdk_poller *g_acceptor_poller;
  52
  53 static void
  54 spdk_iscsi_portal_accept(struct spdk_iscsi_portal *portal)
  55 {
  56         int                             rc, sock;
  57
  58         if (portal->sock < 0) {
  59                 return;
  60         }
  61
  62         while (1) {
  63                 rc = spdk_sock_accept(portal->sock);
  64                 if (rc >= 0) {
  65                         sock = rc;
  66                         rc = spdk_iscsi_conn_construct(portal, sock);
  67                         if (rc < 0) {
  68                                 close(sock);
  69                                 SPDK_ERRLOG("spdk_iscsi_connection_construct() failed\n");
  70                                 break;
  71                         }
  72                 } else {
  73                         if (errno != EAGAIN && errno != EWOULDBLOCK) {
  74                                 SPDK_ERRLOG("accept error(%d): %s\n", errno, strerror(errno));
  75                         }
  76                         break;
  77                 }
  78         }
  79 }
  80
  81 static void
  82 spdk_acceptor(void *arg)
  83 {
  84         struct spdk_iscsi_globals               *iscsi = arg;
  85         struct spdk_iscsi_portal_grp    *portal_group;
  86         struct spdk_iscsi_portal        *portal;
  87
  88         TAILQ_FOREACH(portal_group, &iscsi->pg_head, tailq) {
  89                 TAILQ_FOREACH(portal, &portal_group->head, tailq) {
  90                         spdk_iscsi_portal_accept(portal);
  91                 }
  92         }
  93 }
  94
  95 void
  96 spdk_iscsi_acceptor_start(void)
  97 {
  98         spdk_poller_register(&g_acceptor_poller, spdk_acceptor, &g_spdk_iscsi, spdk_env_get_current_core(),
  99                              ACCEPT_TIMEOUT_US);
 100 }
 101
 102 void
 103 spdk_iscsi_acceptor_stop(void)
 104 {
 105         spdk_poller_unregister(&g_acceptor_poller, NULL);
 106 }