From 6a632625c7da7594d059b88dae0e9c591af147ba Mon Sep 17 00:00:00 2001
From: Jonas Bonn <jonas@southpole.se>
Date: Thu, 25 Nov 2010 02:30:32 +0000
Subject: [PATCH] ethoc: remove division from loops

Calculating the BD entry using a modulus operation isn't optimal, especially
inside the loop.  This patch removes the modulus operations in favour of:

i)  simply checking for wrapping in the case of cur_rx
ii) forcing num_tx to be a power of two and using it to mask out the
    entry from cur_tx

The also prevents possible issues related overflow of the cur_rx and cur_tx
counters.

Signed-off-by: Jonas Bonn <jonas@southpole.se>
Signed-off-by: David S. Miller <davem@davemloft.net>
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