net/filter-mirror.c: Make filter mirror support vnet support.
We add the vnet_hdr_support option for filter-mirror, default is disabled.
If you use virtio-net-pci or other driver needs vnet_hdr, please enable it.
You can use it for example:
-object filter-mirror,id=m0,netdev=hn0,queue=tx,outdev=mirror0,vnet_hdr_support
If it has vnet_hdr_support flag, we will change the sending packet format from
struct {int size; const uint8_t buf[];} to {int size; int vnet_hdr_len; const uint8_t buf[];}.
make other module(like colo-compare) know how to parse net packet correctly.
Signed-off-by: Zhang Chen <zhangchen.fnst@cn.fujitsu.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
diff --git a/qemu-options.hx b/qemu-options.hx
index 2cc70b9..9eee712 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -4249,10 +4249,9 @@
@option{tx}: the filter is attached to the transmit queue of the netdev,
where it will receive packets sent by the netdev.
-@item -object filter-mirror,id=@var{id},netdev=@var{netdevid},outdev=@var{chardevid}[,queue=@var{all|rx|tx}]
+@item -object filter-mirror,id=@var{id},netdev=@var{netdevid},outdev=@var{chardevid},queue=@var{all|rx|tx}[,vnet_hdr_support]
-filter-mirror on netdev @var{netdevid},mirror net packet to chardev
-@var{chardevid}
+filter-mirror on netdev @var{netdevid},mirror net packet to chardev@var{chardevid}, if it has the vnet_hdr_support flag, filter-mirror will mirror packet with vnet_hdr_len.
@item -object filter-redirector,id=@var{id},netdev=@var{netdevid},indev=@var{chardevid},
outdev=@var{chardevid}[,queue=@var{all|rx|tx}]