ipv4: fib: Notify about nexthop status changes
authorIdo Schimmel <idosch@mellanox.com>
Wed, 8 Feb 2017 10:16:39 +0000 (11:16 +0100)
committerDavid S. Miller <davem@davemloft.net>
Wed, 8 Feb 2017 20:25:18 +0000 (15:25 -0500)
commit982acb97560c8118c2109504a22b0d78a580547d
treed262e8cff973d4916d11a7f6b2b1e216de8ae1c4
parent70ad35067c99dd6fb1fefbabf11dd53806f1978c
ipv4: fib: Notify about nexthop status changes

When a multipath route is hit the kernel doesn't consider nexthops that
are DEAD or LINKDOWN when IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN is set.
Devices that offload multipath routes need to be made aware of nexthop
status changes. Otherwise, the device will keep forwarding packets to
non-functional nexthops.

Add the FIB_EVENT_NH_{ADD,DEL} events to the fib notification chain,
which notify capable devices when they should add or delete a nexthop
from their tables.

Cc: Roopa Prabhu <roopa@cumulusnetworks.com>
Cc: David Ahern <dsa@cumulusnetworks.com>
Cc: Andy Gospodarek <andy@greyhouse.net>
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Reviewed-by: Andy Gospodarek <gospo@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
include/net/ip_fib.h
net/ipv4/fib_semantics.c