From: Yi Zou <yi.zou@intel.com>
Date: Fri, 16 Mar 2012 00:18:54 +0000 (+0000)
Subject: fcoe: use CHECKSUM_UNNECESSARY instead of CHECKSUM_PARTIAL on tx
X-Git-Tag: v3.4-rc2~37^2~19^2~7
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c98291ee1ceac03912e24b3219fa6e7dc0d52f5e;p=pandora-kernel.git

fcoe: use CHECKSUM_UNNECESSARY instead of CHECKSUM_PARTIAL on tx

Fix a bug when using 'ethtool -K ethx tx off' to turn off tx ip checksum,
FCoE CRC offload should not be impacte. The skb_checksum_help() is needed
only if it's not FCoE traffic for ip checksum, regardless of ethtool toggling
the tx ip checksum on or off. Instead of using CHECKSUM_PARTIAL, we will
use CHECKSUM_UNNECESSARY as a proper indication to avoid sw ip checksum
on FCoE frames.

Ref. to original discussion thread:
http://patchwork.ozlabs.org/patch/146567/

CC: "James E.J. Bottomley" <JBottomley@parallels.com>
CC: Robert Love <robert.w.love@intel.com>
Signed-off-by: Yi Zou <yi.zou@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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