From: Eric Dumazet <edumazet@google.com>
Date: Thu, 1 Aug 2013 13:49:52 +0000 (-0700)
Subject: ax88179_178a: avoid copy of tx tcp packets
X-Git-Tag: v3.12-rc1~132^2~363
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f27070158d6754765f2f5fd1617e8e42a0ea2318;p=pandora-kernel.git

ax88179_178a: avoid copy of tx tcp packets

ax88179_tx_fixup() has quite complex code trying to push 8 bytes
of control data (len/mss), but fails to do it properly for TCP packets,
incurring an extra copy and point of memory allocation failure.

Lets use the simple and approved way.

dev->needed_headroom being 8, all frames should have 8 bytes of
headroom, so the extra copy should be unlikely anyway.

This patch should improve performance for TCP xmits.

Reported-by: Ming Lei <ming.lei@canonical.com>
Tested-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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