Commit a6db4494d218c ("net: ipv4: Consider failed nexthops in multipath
routes") added support for checking neighbor state when selecting a path
for multipath route lookups. It works but incurs a delay waiting for
the neighbor entry to timeout. Improve the path selection by flushing
non-permanent neighbor entries when carrier is off.
Signed-off-by: Satish Ashok <sas...@cumulusnetworks.com>
Signed-off-by: David Ahern <dsah...@gmail.com>
---
net/ipv4/fib_frontend.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c
index f02819134ba2..aa8fea74858f 100644
--- a/net/ipv4/fib_frontend.c
+++ b/net/ipv4/fib_frontend.c
@@ -1226,10 +1226,13 @@ static int fib_netdev_event(struct notifier_block
*this, unsigned long event, vo
break;
case NETDEV_CHANGE:
flags = dev_get_flags(dev);
- if (flags & (IFF_RUNNING | IFF_LOWER_UP))
+ if (flags & (IFF_RUNNING | IFF_LOWER_UP)) {
fib_sync_up(dev, RTNH_F_LINKDOWN);
- else
+ } else {
fib_sync_down_dev(dev, event, false);
+ if (IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev))
+ neigh_carrier_down(&arp_tbl, dev);
+ }
/* fall through */
case NETDEV_CHANGEMTU:
rt_cache_flush(net);
--
2.1.4
