From: Tom Herbert <therbert@google.com>
Date: Thu, 28 Aug 2014 04:26:46 +0000 (-0700)
Subject: net: Clarification of CHECKSUM_UNNECESSARY
X-Git-Tag: fixes-against-v3.18-rc2~81^2~192^2~7
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=77cffe23c1f88835f6bd7b47bfa0c060c2969828;p=pandora-kernel.git

net: Clarification of CHECKSUM_UNNECESSARY

This patch:
 - Clarifies the specific requirements of devices returning
   CHECKSUM_UNNECESSARY (comments in skbuff.h).
 - Adds csum_level field to skbuff. This is used to express how
   many checksums are covered by CHECKSUM_UNNECESSARY (stores n - 1).
   This replaces the overloading of skb->encapsulation, that field is
   is now only used to indicate inner headers are valid.
 - Change __skb_checksum_validate_needed to "consume" each checksum
   as indicated by csum_level as layers of the the packet are parsed.
 - Remove skb_pop_rcv_encapsulation, no longer needed in the new
   csum_level model.

Signed-off-by: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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