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>
1 file changed