From ee45fd92c739db5b7950163d91dfe5f016af6d24 Mon Sep 17 00:00:00 2001
From: Jon Cooper <jcooper@solarflare.com>
Date: Mon, 2 Sep 2013 18:24:29 +0100
Subject: [PATCH] sfc: Use TX PIO for sufficiently small packets

Sufficiently small linear packets can be copied into the PIO buffer
with a single call to memcpy_toio().  Non-linear packets require an
intermediate cache-line-sized buffer.

[bwh: I wrote the first version of this, but Jon did the hard work to
 handle non-linear packets.]
Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
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