From: Daniel Borkmann <dborkman@redhat.com>
Date: Wed, 30 Oct 2013 10:50:49 +0000 (+0100)
Subject: lib: crc32: add functionality to combine two crc32{, c}s in GF(2)
X-Git-Tag: v3.13-rc1~105^2~76^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6e95fcaa42e5078ac265964deebed597f9eae07a;p=pandora-kernel.git

lib: crc32: add functionality to combine two crc32{, c}s in GF(2)

This patch adds a combinator to merge two or more crc32{,c}s
into a new one. This is useful for checksum computations of
fragmented skbs that use crc32/crc32c as checksums.

The arithmetics for combining both in the GF(2) was taken and
slightly modified from zlib. Only passing two crcs is insufficient
as two crcs and the length of the second piece is needed for
merging. The code is made generic, so that only polynomials
need to be passed for crc32_le resp. crc32c_le.

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>
---

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