[Qemu-devel] [V5 PATCH 2/4] net: model specific announcing support

[Jason Wang]

This patch introduces a function pointer in NetClientInfo which is
called during self announcement. With this, each kind of card can
announce the link with a specific way. The old method is still kept
for cards that have not implemented this or old guest. The first user
would be virtio-net.

Signed-off-by: Jason Wang <jasow...@redhat.com>
---
 net.h    |    2 ++
 savevm.c |    8 +++++---
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/net.h b/net.h
index 75a8c15..7195bfc 100644
--- a/net.h
+++ b/net.h
@@ -48,6 +48,7 @@ typedef ssize_t (NetReceive)(VLANClientState *, const uint8_t 
*, size_t);
 typedef ssize_t (NetReceiveIOV)(VLANClientState *, const struct iovec *, int);
 typedef void (NetCleanup) (VLANClientState *);
 typedef void (LinkStatusChanged)(VLANClientState *);
+typedef int (NetAnnounce)(VLANClientState *);
 
 typedef struct NetClientInfo {
     net_client_type type;
@@ -59,6 +60,7 @@ typedef struct NetClientInfo {
     NetCleanup *cleanup;
     LinkStatusChanged *link_status_changed;
     NetPoll *poll;
+    NetAnnounce *announce;
 } NetClientInfo;
 
 struct VLANClientState {
diff --git a/savevm.c b/savevm.c
index 80be1ff..7558c1d 100644
--- a/savevm.c
+++ b/savevm.c
@@ -123,10 +123,12 @@ static void qemu_announce_self_iter(NICState *nic, void 
*opaque)
 {
     uint8_t buf[60];
     int len;
+    NetAnnounce *func = nic->nc.info->announce;
 
-    len = announce_self_create(buf, nic->conf->macaddr.a);
-
-    qemu_send_packet_raw(&nic->nc, buf, len);
+    if (!func || func(&nic->nc) != 0) {
+        len = announce_self_create(buf, nic->conf->macaddr.a);
+        qemu_send_packet_raw(&nic->nc, buf, len);
+    }
 }