From: Alexander Duyck <alexander.h.duyck@intel.com>
Date: Wed, 17 Nov 2010 03:26:49 +0000 (-0800)
Subject: ixgbe: drop ring->head, make ring->tail a pointer instead of offset
X-Git-Tag: v2.6.38-rc1~476^2~547^2~40
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=84ea2591e4a24775c2735511a1cc3cf88edd249d;p=pandora-kernel.git

ixgbe: drop ring->head, make ring->tail a pointer instead of offset

This change drops ring->head since it is not used in any hot-path and can
easily be determined using IXGBE_[RT]DH(ring->reg_idx).

It also changes ring->tail into a true pointer so we can avoid unnecessary
pointer math to find the location of the tail.

In addition I also dropped the setting of head and tail in
ixgbe_clean_[rx|tx]_ring. The only location that should be setting the head
and tail values is ixgbe_configure_[rx|tx]_ring and that is only while the
queue is disabled.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Tested-by: Ross Brattain <ross.b.brattain@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
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