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-rw-r--r--Documentation/networking/bonding.txt30
1 files changed, 25 insertions, 5 deletions
diff --git a/Documentation/networking/bonding.txt b/Documentation/networking/bonding.txt
index 6b1c7110534..10a015c384b 100644
--- a/Documentation/networking/bonding.txt
+++ b/Documentation/networking/bonding.txt
@@ -752,12 +752,22 @@ xmit_hash_policy
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 formula is
+
+ hash = (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)
+
+ (((hash >> 24) XOR (hash >> 16) XOR (hash >> 8) XOR hash)
+ XOR (source MAC XOR destination MAC))
+ 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
@@ -778,19 +788,29 @@ xmit_hash_policy
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
+
+ hash = (source port XOR dest port) XOR
+ ((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))
+
+ ((hash >> 24) XOR (hash >> 16) XOR (hash >> 8) XOR hash)
+ 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.