migration/socket.c

   1 /*
   2  * QEMU live migration via socket
   3  *
   4  * Copyright Red Hat, Inc. 2009-2016
   5  *
   6  * Authors:
   7  *  Chris Lalancette <clalance@redhat.com>
   8  *  Daniel P. Berrange <berrange@redhat.com>
   9  *
  10  * This work is licensed under the terms of the GNU GPL, version 2.  See
  11  * the COPYING file in the top-level directory.
  12  *
  13  * Contributions after 2012-01-13 are licensed under the terms of the
  14  * GNU GPL, version 2 or (at your option) any later version.
  15  */
  16
  17 #include "qemu/osdep.h"
  18 #include "qemu/cutils.h"
  19
  20 #include "qemu/error-report.h"
  21 #include "qapi/error.h"
  22 #include "channel.h"
  23 #include "socket.h"
  24 #include "migration.h"
  25 #include "qemu-file.h"
  26 #include "io/channel-socket.h"
  27 #include "io/net-listener.h"
  28 #include "trace.h"
  29
  30
  31 struct SocketOutgoingArgs {
  32     SocketAddress *saddr;
  33 } outgoing_args;
  34
  35 void socket_send_channel_create(QIOTaskFunc f, void *data)
  36 {
  37     QIOChannelSocket *sioc = qio_channel_socket_new();
  38     qio_channel_socket_connect_async(sioc, outgoing_args.saddr,
  39                                      f, data, NULL, NULL);
  40 }
  41
  42 int socket_send_channel_destroy(QIOChannel *send)
  43 {
  44     /* Remove channel */
  45     object_unref(OBJECT(send));
  46     if (outgoing_args.saddr) {
  47         qapi_free_SocketAddress(outgoing_args.saddr);
  48         outgoing_args.saddr = NULL;
  49     }
  50     return 0;
  51 }
  52
  53 struct SocketConnectData {
  54     MigrationState *s;
  55     char *hostname;
  56 };
  57
  58 static void socket_connect_data_free(void *opaque)
  59 {
  60     struct SocketConnectData *data = opaque;
  61     if (!data) {
  62         return;
  63     }
  64     g_free(data->hostname);
  65     g_free(data);
  66 }
  67
  68 static void socket_outgoing_migration(QIOTask *task,
  69                                       gpointer opaque)
  70 {
  71     struct SocketConnectData *data = opaque;
  72     QIOChannel *sioc = QIO_CHANNEL(qio_task_get_source(task));
  73     Error *err = NULL;
  74
  75     if (qio_task_propagate_error(task, &err)) {
  76         trace_migration_socket_outgoing_error(error_get_pretty(err));
  77            goto out;
  78     }
  79
  80     trace_migration_socket_outgoing_connected(data->hostname);
  81
  82     if (migrate_use_zero_copy_send() &&
  83         !qio_channel_has_feature(sioc, QIO_CHANNEL_FEATURE_WRITE_ZERO_COPY)) {
  84         error_setg(&err, "Zero copy send feature not detected in host kernel");
  85     }
  86
  87 out:
  88     migration_channel_connect(data->s, sioc, data->hostname, err);
  89     object_unref(OBJECT(sioc));
  90 }
  91
  92 static void
  93 socket_start_outgoing_migration_internal(MigrationState *s,
  94                                          SocketAddress *saddr,
  95                                          Error **errp)
  96 {
  97     QIOChannelSocket *sioc = qio_channel_socket_new();
  98     struct SocketConnectData *data = g_new0(struct SocketConnectData, 1);
  99
 100     data->s = s;
 101
 102     /* in case previous migration leaked it */
 103     qapi_free_SocketAddress(outgoing_args.saddr);
 104     outgoing_args.saddr = saddr;
 105
 106     if (saddr->type == SOCKET_ADDRESS_TYPE_INET) {
 107         data->hostname = g_strdup(saddr->u.inet.host);
 108     }
 109
 110     qio_channel_set_name(QIO_CHANNEL(sioc), "migration-socket-outgoing");
 111     qio_channel_socket_connect_async(sioc,
 112                                      saddr,
 113                                      socket_outgoing_migration,
 114                                      data,
 115                                      socket_connect_data_free,
 116                                      NULL);
 117 }
 118
 119 void socket_start_outgoing_migration(MigrationState *s,
 120                                      const char *str,
 121                                      Error **errp)
 122 {
 123     Error *err = NULL;
 124     SocketAddress *saddr = socket_parse(str, &err);
 125     if (!err) {
 126         socket_start_outgoing_migration_internal(s, saddr, &err);
 127     }
 128     error_propagate(errp, err);
 129 }
 130
 131 static void socket_accept_incoming_migration(QIONetListener *listener,
 132                                              QIOChannelSocket *cioc,
 133                                              gpointer opaque)
 134 {
 135     trace_migration_socket_incoming_accepted();
 136
 137     if (migration_has_all_channels()) {
 138         error_report("%s: Extra incoming migration connection; ignoring",
 139                      __func__);
 140         return;
 141     }
 142
 143     qio_channel_set_name(QIO_CHANNEL(cioc), "migration-socket-incoming");
 144     migration_channel_process_incoming(QIO_CHANNEL(cioc));
 145 }
 146
 147 static void
 148 socket_incoming_migration_end(void *opaque)
 149 {
 150     QIONetListener *listener = opaque;
 151
 152     qio_net_listener_disconnect(listener);
 153     object_unref(OBJECT(listener));
 154 }
 155
 156 static void
 157 socket_start_incoming_migration_internal(SocketAddress *saddr,
 158                                          Error **errp)
 159 {
 160     QIONetListener *listener = qio_net_listener_new();
 161     MigrationIncomingState *mis = migration_incoming_get_current();
 162     size_t i;
 163     int num = 1;
 164
 165     qio_net_listener_set_name(listener, "migration-socket-listener");
 166
 167     if (migrate_use_multifd()) {
 168         num = migrate_multifd_channels();
 169     }
 170
 171     if (qio_net_listener_open_sync(listener, saddr, num, errp) < 0) {
 172         object_unref(OBJECT(listener));
 173         return;
 174     }
 175
 176     mis->transport_data = listener;
 177     mis->transport_cleanup = socket_incoming_migration_end;
 178
 179     qio_net_listener_set_client_func_full(listener,
 180                                           socket_accept_incoming_migration,
 181                                           NULL, NULL,
 182                                           g_main_context_get_thread_default());
 183
 184     for (i = 0; i < listener->nsioc; i++)  {
 185         SocketAddress *address =
 186             qio_channel_socket_get_local_address(listener->sioc[i], errp);
 187         if (!address) {
 188             return;
 189         }
 190         migrate_add_address(address);
 191         qapi_free_SocketAddress(address);
 192     }
 193 }
 194
 195 void socket_start_incoming_migration(const char *str, Error **errp)
 196 {
 197     Error *err = NULL;
 198     SocketAddress *saddr = socket_parse(str, &err);
 199     if (!err) {
 200         socket_start_incoming_migration_internal(saddr, &err);
 201     }
 202     qapi_free_SocketAddress(saddr);
 203     error_propagate(errp, err);
 204 }