tree 79c4280715571a77b08b5946dbac2a2ad0fe1c4a
parent 8d0d21f4053c07714802cbe8b1fe26913ec296cc
author Fernando Luis Vazquez Cao <fernando@oss.ntt.co.jp> 1392726009 +0900
committer David S. Miller <davem@davemloft.net> 1392880538 -0500

tun: remove bogus hardware vlan acceleration flags from vlan_features

Even though only the outer vlan tag can be HW accelerated in the transmission
path, in the TUN/TAP driver vlan_features mirrors hw_features, which happens
to have the NETIF_F_HW_VLAN_?TAG_TX flags set. Because of this, during packet
tranmisssion through a stacked vlan device dev_hard_start_xmit, (incorrectly)
assuming that the vlan device supports hardware vlan acceleration, does not
add the vlan header to the skb payload and the inner vlan tags are lost
(vlan_tci contains the outer vlan tag when userspace reads the packet from
the tap device).

Signed-off-by: Fernando Luis Vazquez Cao <fernando@oss.ntt.co.jp>
Signed-off-by: Toshiaki Makita <makita.toshiaki@lab.ntt.co.jp>
Signed-off-by: David S. Miller <davem@davemloft.net>