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virtio_net: Add support for VLAN filtering in the hypervisor

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VLAN filtering allows the hypervisor to drop packets from VLANs
that we're not a part of, further reducing the number of extraneous
packets recieved.  This makes use of the VLAN virtqueue command class.
The CTRL_VLAN feature bit tells us whether the backend supports VLAN
filtering.

Signed-off-by: Alex Williamson <alex.williamson@hp.com>
Acked-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alex Williamson 2009-02-04 09:02:50 +00:00 • committed by David S. Miller
parent f565a7c259
commit 0bde95690d
2 changed files with 44 additions and 1 deletions
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14
include/linux/virtio_net.h
View file

@ -25,6 +25,7 @@
#define VIRTIO_NET_F_STATUS 16 /* virtio_net_config.status available */
#define VIRTIO_NET_F_CTRL_VQ 17 /* Control channel available */
#define VIRTIO_NET_F_CTRL_RX 18 /* Control channel RX mode support */
#define VIRTIO_NET_F_CTRL_VLAN 19 /* Control channel VLAN filtering */
#define VIRTIO_NET_S_LINK_UP 1 /* Link is up */
@ -111,4 +112,17 @@ struct virtio_net_ctrl_mac {
#define VIRTIO_NET_CTRL_MAC 1
#define VIRTIO_NET_CTRL_MAC_TABLE_SET 0
/*
* Control VLAN filtering
*
* The VLAN filter table is controlled via a simple ADD/DEL interface.
* VLAN IDs not added may be filterd by the hypervisor. Del is the
* opposite of add. Both commands expect an out entry containing a 2
* byte VLAN ID. VLAN filterting is available with the
* VIRTIO_NET_F_CTRL_VLAN feature bit.
*/
#define VIRTIO_NET_CTRL_VLAN 2
#define VIRTIO_NET_CTRL_VLAN_ADD 0
#define VIRTIO_NET_CTRL_VLAN_DEL 1
#endif /* _LINUX_VIRTIO_NET_H */