From: Bud Grise <griseb@cisco.com>
Date: Wed, 24 Feb 2016 21:14:22 +0000 (-0500)
Subject: Add rotates to v6 worker hash to prevent SIP/DIP synchronizing.
X-Git-Tag: v16.06-rc1~272
X-Git-Url: https://gerrit.fd.io/r/gitweb?a=commitdiff_plain;h=8fbd37edacf3bc95b06d6fa620e28a08b0b0905f;p=vpp.git

Add rotates to v6 worker hash to prevent SIP/DIP synchronizing.

Change-Id: Ibe8ec6271b3f04290a60c0145e59a01d3130500f
Signed-off-by: Todd Foggoa (tfoggoa) <tfoggoa@cisco.com>
---

diff --git a/vnet/vnet/devices/dpdk/node.c b/vnet/vnet/devices/dpdk/node.c
index b9815706169..72d564ba8b2 100644
--- a/vnet/vnet/devices/dpdk/node.c
+++ b/vnet/vnet/devices/dpdk/node.c
@@ -963,9 +963,9 @@ static inline u64 ipv6_get_key (ip6_header_t *ip)
    u64  hash_key;
 
    hash_key = ip->src_address.as_u64[0] ^
-              ip->src_address.as_u64[1] ^
-              ip->dst_address.as_u64[0] ^
-              ip->dst_address.as_u64[1] ^
+              rotate_left(ip->src_address.as_u64[1],13) ^
+              rotate_left(ip->dst_address.as_u64[0],26) ^
+              rotate_left(ip->dst_address.as_u64[1],39) ^
               ip->protocol;
 
    return hash_key;