tree 44210434f0677d58165a5259929bb1d3a731db71
parent b2df430b52cf9ed2c01649aba7fde79ff57d2b98
author Hariprasad Shenai <hariprasad@chelsio.com> 1469692737 +0530
committer David S. Miller <davem@davemloft.net> 1469936399 -0700

cxgb4/cxgb4vf: Fixes regression in perf when tx vlan offload is disabled

The commit 637d3e997351 ("cxgb4: Discard the packet if the length is
greater than mtu") introduced a regression in the VLAN interface
performance when Tx VLAN offload is disabled.

Check if skb is tagged, regardless of whether it is hardware accelerated
or not. Presently we were checking only for hardware acclereated one,
which caused performance to drop to ~0.17Mbps on a 10GbE adapter for
VLAN interface, when tx vlan offload is turned off using ethtool.
The ethernet head length calculation was going wrong in this case, and
driver ended up dropping packets.

Fixes: 637d3e997351 ("cxgb4: Discard the packet if the length is greater than mtu")
Signed-off-by: Hariprasad Shenai <hariprasad@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>