From f8f3b5ae3ea45ef6b00b471fed0fc90552a3c4af Mon Sep 17 00:00:00 2001
From: Jon Cooper <jcooper@solarflare.com>
Date: Mon, 30 Sep 2013 17:36:50 +0100
Subject: [PATCH] sfc: Correct RX dropped count for drops while interface is
 down

We don't directly control RX ingress on Siena or any later
controllers, and so we cannot prevent packets from entering the RX
datapath while the RX queues are not set up.  This results in
the hardware incrementing RX_NODESC_DROP_CNT, but it's not an
error and we should not include it in error stats.

When bringing an interface up or down, pull (or wait for) stats and
count the number of packets that were dropped while the interface was
down.  Subtract this from the reported RX dropped count.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
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