• Sridhar Samudrala's avatar
    macvlan: Introduce 'passthru' mode to takeover the underlying device · eb06acdc
    Sridhar Samudrala authored
    With the current default 'vepa' mode, a KVM guest using virtio with
    macvtap backend has the following limitations.
    - cannot change/add a mac address on the guest virtio-net
    - cannot create a vlan device on the guest virtio-net
    - cannot enable promiscuous mode on guest virtio-net
    
    To address these limitations, this patch introduces a new mode called
    'passthru' when creating a macvlan device which allows takeover of the
    underlying device and passing it to a guest using virtio with macvtap
    backend.
    
    Only one macvlan device is allowed in passthru mode and it inherits
    the mac address from the underlying device and sets it in promiscuous
    mode to receive and forward all the packets.
    Signed-off-by: default avatarSridhar Samudrala <sri@us.ibm.com>
    
    -------------------------------------------------------------------------
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    eb06acdc
macvlan.c 21.5 KB