switchdev: add offload_fwd_mark generator helper
authorScott Feldman <sfeldma@gmail.com>
Sun, 19 Jul 2015 01:24:50 +0000 (18:24 -0700)
committerDavid S. Miller <davem@davemloft.net>
Tue, 21 Jul 2015 01:32:44 +0000 (18:32 -0700)
commit1a3b2ec93d4277b121979321b4024b438cb09504
treec57bf0a7563a0cfcdcda3c08ca90591c15d21f0a
parentd754f98b502ad9a8c7570d494e1eaa0e6bc0350c
switchdev: add offload_fwd_mark generator helper

skb->offload_fwd_mark and dev->offload_fwd_mark are 32-bit and should be
unique for device and may even be unique for a sub-set of ports within
device, so add switchdev helper function to generate unique marks based on
port's switch ID and group_ifindex.  group_ifindex would typically be the
container dev's ifindex, such as the bridge's ifindex.

The generator uses a global hash table to store offload_fwd_marks hashed by
{switch ID, group_ifindex} key.

Signed-off-by: Scott Feldman <sfeldma@gmail.com>
Acked-by: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: David S. Miller <davem@davemloft.net>
include/net/switchdev.h
net/switchdev/switchdev.c