bonding: update bonding.txt for Layer2 hash factors

Document the Layer 2 hash factors with packet type ID field.

CC: Jay Vosburgh <j.vosburgh@gmail.com>
CC: Veaceslav Falico <vfalico@gmail.com>
CC: Andy Gospodarek <andy@greyhouse.net>
CC: David S. Miller <davem@davemloft.net>
CC: Pan Jiafei <Jiafei.Pan@freescale.com>
Signed-off-by: Jianhua Xie <jianhua.xie@freescale.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/Documentation/networking/bonding.txt b/Documentation/networking/bonding.txt
index 9c723ec..eeb5b2e 100644 (file)
--- a/Documentation/networking/bonding.txt
+++ b/Documentation/networking/bonding.txt
@@ -542,10 +542,10 @@ mode
 
                XOR policy: Transmit based on the selected transmit
                hash policy.  The default policy is a simple [(source
-               MAC address XOR'd with destination MAC address) modulo
-               slave count].  Alternate transmit policies may be
-               selected via the xmit_hash_policy option, described
-               below.
+               MAC address XOR'd with destination MAC address XOR
+               packet type ID) modulo slave count].  Alternate transmit
+               policies may be selected via the xmit_hash_policy option,
+               described below.
 
                This mode provides load balancing and fault tolerance.
 
@@ -801,10 +801,11 @@ xmit_hash_policy
 
        layer2
 
-               Uses XOR of hardware MAC addresses to generate the
-               hash.  The formula is
+               Uses XOR of hardware MAC addresses and packet type ID
+               field to generate the hash. The formula is
 
-               (source MAC XOR destination MAC) modulo slave count
+               hash = source MAC XOR destination MAC XOR packet type ID
+               slave number = hash modulo slave count
 
                This algorithm will place all traffic to a particular
                network peer on the same slave.
@@ -819,7 +820,7 @@ xmit_hash_policy
                Uses XOR of hardware MAC addresses and IP addresses to
                generate the hash.  The formula is
 
-               hash = source MAC XOR destination MAC
+               hash = source MAC XOR destination MAC XOR packet type ID
                hash = hash XOR source IP XOR destination IP
                hash = hash XOR (hash RSHIFT 16)
                hash = hash XOR (hash RSHIFT 8)
@@ -2301,13 +2302,13 @@ broadcast: Like active-backup, there is not much advantage to this
        bandwidth.  
 
        Additionally, the linux bonding 802.3ad implementation
-       distributes traffic by peer (using an XOR of MAC addresses),
-       so in a "gatewayed" configuration, all outgoing traffic will
-       generally use the same device.  Incoming traffic may also end
-       up on a single device, but that is dependent upon the
-       balancing policy of the peer's 8023.ad implementation.  In a
-       "local" configuration, traffic will be distributed across the
-       devices in the bond.
+       distributes traffic by peer (using an XOR of MAC addresses
+       and packet type ID), so in a "gatewayed" configuration, all
+       outgoing traffic will generally use the same device.  Incoming
+       traffic may also end up on a single device, but that is
+       dependent upon the balancing policy of the peer's 8023.ad
+       implementation.  In a "local" configuration, traffic will be
+       distributed across the devices in the bond.
 
        Finally, the 802.3ad mode mandates the use of the MII monitor,
        therefore, the ARP monitor is not available in this mode.