From 3dced740c243f454a9b83fbe73133911d5c6ce8d Mon Sep 17 00:00:00 2001
From: Ben Hutchings <bhutchings@solarflare.com>
Date: Sat, 27 Apr 2013 01:55:18 +0100
Subject: [PATCH] sfc: Add support for reading packet length from prefix

Define a flag for struct efx_rx_buffer and efx_rx_packet() that
indicates packet length must be read from the prefix.  If this
is set, read the length in __efx_rx_packet() (when the prefix
should have arrived in cache).

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