+ /* In case of RARP (message size is 60) notify backup to send a fake RARP.
+ This fake RARP will be sent by backend only for guest
+ without GUEST_ANNOUNCE capability.
+ */
+ if (size == 60) {
+ VhostUserState *s = DO_UPCAST(VhostUserState, nc, nc);
+ int r;
+ static int display_rarp_failure = 1;
+ char mac_addr[6];
+
+ /* extract guest mac address from the RARP message */
+ memcpy(mac_addr, &buf[6], 6);
+
+ r = vhost_net_notify_migration_done(s->vhost_net, mac_addr);
+
+ if ((r != 0) && (display_rarp_failure)) {
+ fprintf(stderr,
+ "Vhost user backend fails to broadcast fake RARP\n");
+ fflush(stderr);
+ display_rarp_failure = 0;
+ }