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[Qemu-devel] [5477] Introduce ethernet announcement function.
From: |
Anthony Liguori |
Subject: |
[Qemu-devel] [5477] Introduce ethernet announcement function. |
Date: |
Mon, 13 Oct 2008 03:13:13 +0000 |
Revision: 5477
http://svn.sv.gnu.org/viewvc/?view=rev&root=qemu&revision=5477
Author: aliguori
Date: 2008-10-13 03:13:12 +0000 (Mon, 13 Oct 2008)
Log Message:
-----------
Introduce ethernet announcement function.
This patch adds an ethernet announce function that will minimize downtime
when doing a live migration. This code originates from KVM.
Signed-off-by: Anthony Liguori <address@hidden>
Modified Paths:
--------------
trunk/sysemu.h
trunk/vl.c
Modified: trunk/sysemu.h
===================================================================
--- trunk/sysemu.h 2008-10-13 03:12:02 UTC (rev 5476)
+++ trunk/sysemu.h 2008-10-13 03:13:12 UTC (rev 5477)
@@ -48,6 +48,8 @@
void do_delvm(const char *name);
void do_info_snapshots(void);
+void qemu_announce_self(void);
+
void main_loop_wait(int timeout);
int qemu_savevm_state_begin(QEMUFile *f);
Modified: trunk/vl.c
===================================================================
--- trunk/vl.c 2008-10-13 03:12:02 UTC (rev 5476)
+++ trunk/vl.c 2008-10-13 03:13:12 UTC (rev 5477)
@@ -6186,6 +6186,45 @@
}
#endif
+#define SELF_ANNOUNCE_ROUNDS 5
+#define ETH_P_EXPERIMENTAL 0x01F1 /* just a number */
+//#define ETH_P_EXPERIMENTAL 0x0012 /* make it the size of the packet */
+#define EXPERIMENTAL_MAGIC 0xf1f23f4f
+
+static int announce_self_create(uint8_t *buf,
+ uint8_t *mac_addr)
+{
+ uint32_t magic = EXPERIMENTAL_MAGIC;
+ uint16_t proto = htons(ETH_P_EXPERIMENTAL);
+
+ /* FIXME: should we send a different packet (arp/rarp/ping)? */
+
+ memset(buf, 0xff, 6); /* h_dst */
+ memcpy(buf + 6, mac_addr, 6); /* h_src */
+ memcpy(buf + 12, &proto, 2); /* h_proto */
+ memcpy(buf + 14, &magic, 4); /* magic */
+
+ return 18; /* len */
+}
+
+void qemu_announce_self(void)
+{
+ int i, j, len;
+ VLANState *vlan;
+ VLANClientState *vc;
+ uint8_t buf[256];
+
+ for (i = 0; i < nb_nics; i++) {
+ len = announce_self_create(buf, nd_table[i].macaddr);
+ vlan = nd_table[i].vlan;
+ for(vc = vlan->first_client; vc != NULL; vc = vc->next) {
+ if (vc->fd_read == tap_receive) /* send only if tap */
+ for (j=0; j < SELF_ANNOUNCE_ROUNDS; j++)
+ vc->fd_read(vc->opaque, buf, len);
+ }
+ }
+}
+
/***********************************************************/
/* savevm/loadvm support */
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