[ovs-git] Open vSwitch: datapath: Rehash 16-bit skbuff hashes into 32 bits. (master)

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- Log -----------------------------------------------------------------
commit 5640cbd8bd18b1f7963a219ce9ae91d8a830ad5a
Diffs: http://openvswitch.org/cgi-bin/gitweb.cgi?p=openvswitch;a=commitdiff;h=5640cbd8bd18b1f7963a219ce9ae91d8a830ad5a
Author: Jesse Gross <jesse at nicira.com>
		
datapath: Rehash 16-bit skbuff hashes into 32 bits.
		
Currently, if the network stack provides skb->rxhash then we use it,
otherwise we compute our own. However, on at least some versions of
RHEL/CentOS, the stack provides a hash that is 16 bits rather than
32 bits. In cases where we use the uppermost bits of the hash this
is particularly bad because we detect that a hash is present and we
use it rather than computing our own but the result is always zero.

This is particularly noticible with tunnel ports that use the hash
to generate a source port, such as VXLAN. On these kernels the tunnel
source port is always the minimum value. To solve this problem while
still taking advantage of the precomputed hash, this rehashes the
hash so that the entropy is spread throughout 32 bits.

Signed-off-by: Jesse Gross <jesse at nicira.com>
Acked-by: Thomas Graf <tgraf at noironetworks.com>


-----------------------------------------------------------------------

Summary of changes:
 acinclude.m4                                 |    2 ++
 datapath/linux/compat/include/linux/skbuff.h |    5 +++++
 2 files changed, 7 insertions(+)


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