netdev - [PATCH V2 2/2] bonding support for IPv6 transmit hashing

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Message-ID: <4F8E0A92.5090408@8192.net>
Date:	Tue, 17 Apr 2012 17:28:02 -0700
From:	John <linux@...2.net>
To:	netdev@...r.kernel.org
Subject: [PATCH V2 2/2] bonding support for IPv6 transmit hashing

--- a/Documentation/networking/bonding.txt	2012-02-08 19:21:53.000000000 -0800
+++ b/Documentation/networking/bonding.txt	2012-02-13 01:11:35.000000000 -0800
@@ -753,12 +753,22 @@
  		protocol information to generate the hash.

  		Uses XOR of hardware MAC addresses and IP addresses to
-		generate the hash.  The formula is
+		generate the hash.  The IPv4 formula is

  		(((source IP XOR dest IP) AND 0xffff) XOR
  			( source MAC XOR destination MAC ))
  				modulo slave count

+		The IPv6 forumla is
+
+		iphash =
+			(source ip quad 2 XOR dest IP quad 2) XOR
+			(source ip quad 3 XOR dest IP quad 3) XOR
+			(source ip quad 4 XOR dest IP quad 4)
+
+		((iphash >> 16) XOR (iphash >> 8) XOR iphash)
+			modulo slave count
+
  		This algorithm will place all traffic to a particular
  		network peer on the same slave.  For non-IP traffic,
  		the formula is the same as for the layer2 transmit
@@ -779,19 +789,30 @@
  		slaves, although a single connection will not span
  		multiple slaves.

-		The formula for unfragmented TCP and UDP packets is
+		The formula for unfragmented IPv4 TCP and UDP packets is

  		((source port XOR dest port) XOR
  			 ((source IP XOR dest IP) AND 0xffff)
  				modulo slave count

-		For fragmented TCP or UDP packets and all other IP
-		protocol traffic, the source and destination port
+		The formula for unfragmented IPv6 TCP and UDP packets is
+
+		iphash =
+			(source ip quad 2 XOR dest IP quad 2) XOR
+			(source ip quad 3 XOR dest IP quad 3) XOR
+			(source ip quad 4 XOR dest IP quad 4)
+
+		((source port XOR dest port) XOR
+			(iphash >> 16) XOR (iphash >> 8) XOR iphash)
+				modulo slave count
+
+		For fragmented TCP or UDP packets and all other IPv4 and
+		IPv6 protocol traffic, the source and destination port
  		information is omitted.  For non-IP traffic, the
  		formula is the same as for the layer2 transmit hash
  		policy.

-		This policy is intended to mimic the behavior of
+		The IPv4 policy is intended to mimic the behavior of
  		certain switches, notably Cisco switches with PFC2 as
  		well as some Foundry and IBM products.

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