tree 95312aa92634472fc2329032890203dfddd0b776
parent bba50b99b2410e863b38afdcd0280eb37f8a8bcc
author Eric Dumazet <eric.dumazet@gmail.com> 1285202771 +0000
committer David S. Miller <davem@davemloft.net> 1285550835 -0700

net: propagate NETIF_F_HIGHDMA to vlans

Automatically allows vlans to get NETIF_F_HIGHDMA if underlying device
supports it.

On 32bit arches (and more precisely if CONFIG_HIGHMEM is enabled), it
can help to reduce cost of illegal_highdma() and __skb_linearize()
calls.

Tested on tg3 , bnx2, bonding, this worked very well.

This is a generalization of a patch provided by Yi Zou & Jeff Kirsher.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>