From c08cc3ccebd46dce44d13a8ce81d249e687eeb8a Mon Sep 17 00:00:00 2001
From: Santiago Leon <santil@linux.vnet.ibm.com>
Date: Fri, 3 Sep 2010 18:28:20 +0000
Subject: [PATCH] ibmveth: Add tx_copybreak

Use the existing bounce buffer if we send a buffer under a certain size.
This saves the overhead of a TCE map/unmap.

I can't see any reason for the wmb() in the bounce buffer case, if we need
a barrier it will be before we call h_send_logical_lan but we have
nothing in the common case. Remove it.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Santiago Leon <santil@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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