bonding: Implement user key part of port_key in an AD system.

The port key has three components - user-key, speed-part, and duplex-part.
The LSBit is for the duplex-part, next 5 bits are for the speed while the
remaining 10 bits are the user defined key bits. Get these 10 bits
from the user-space (through the SysFs interface) and use it to form the
admin port-key. Allowed range for the user-key is 0 - 1023 (10 bits). If
it is not provided then use zero for the user-key-bits (default).

It can set using following example code -

   # modprobe bonding mode=4
   # usr_port_key=$(( RANDOM & 0x3FF ))
   # echo $usr_port_key > /sys/class/net/bond0/bonding/ad_user_port_key
   # echo +eth1 > /sys/class/net/bond0/bonding/slaves
   ...
   # ip link set bond0 up

Signed-off-by: Mahesh Bandewar <maheshb@google.com>
Reviewed-by: Nikolay Aleksandrov <nikolay@redhat.com>
[jt: * fixed up style issues reported by checkpatch
     * fixed up context from change in ad_actor_sys_prio patch]
Signed-off-by: Jonathan Toppins <jtoppins@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 7 deletions

diff --git a/drivers/net/bonding/bond_3ad.c b/drivers/net/bonding/bond_3ad.c
index 012f7bc22d91..7fde4d5c2b28 100644
--- a/drivers/net/bonding/bond_3ad.c
+++ b/drivers/net/bonding/bond_3ad.c
@@ -75,10 +75,10 @@
 /* Port Key definitions
  * key is determined according to the link speed, duplex and
  * user key (which is yet not supported)
- * --------------------------------------------------------------
- * Port key :	| User key	| Speed		| Duplex	|
- * --------------------------------------------------------------
- * 16		  6		  1		  0
+ *           --------------------------------------------------------------
+ * Port key  | User key (10 bits)           | Speed (5 bits)      | Duplex|
+ *           --------------------------------------------------------------
+ *           |15                           6|5                   1|0
  */
 #define  AD_DUPLEX_KEY_MASKS    0x1
 #define  AD_SPEED_KEY_MASKS     0x3E
@@ -1951,10 +1951,10 @@ void bond_3ad_bind_slave(struct slave *slave)
 
 		port->slave = slave;
 		port->actor_port_number = SLAVE_AD_INFO(slave)->id;
-		/* key is determined according to the link speed, duplex and user key(which
-		 * is yet not supported)
+		/* key is determined according to the link speed, duplex and
+		 * user key
 		 */
-		port->actor_admin_port_key = 0;
+		port->actor_admin_port_key = bond->params.ad_user_port_key << 6;
 		port->actor_admin_port_key |= __get_duplex(port);
 		port->actor_admin_port_key |= (__get_link_speed(port) << 1);
 		port->actor_oper_port_key = port->actor_admin_port_key;