net: ipv4: add sysctl for nexthop api compatibility mode

[linux-2.6-microblaze.git] / Documentation / networking / ip-sysctl.txt

diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index 9375324..5cdc37c 100644 (file)
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -1560,6 +1560,18 @@ skip_notify_on_dev_down - BOOLEAN
        on userspace caches to track link events and evict routes.
        Default: false (generate message)
 
+nexthop_compat_mode - BOOLEAN
+       New nexthop API provides a means for managing nexthops independent of
+       prefixes. Backwards compatibilty with old route format is enabled by
+       default which means route dumps and notifications contain the new
+       nexthop attribute but also the full, expanded nexthop definition.
+       Further, updates or deletes of a nexthop configuration generate route
+       notifications for each fib entry using the nexthop. Once a system
+       understands the new API, this sysctl can be disabled to achieve full
+       performance benefits of the new API by disabling the nexthop expansion
+       and extraneous notifications.
+       Default: true (backward compat mode)
+
 IPv6 Fragmentation:
 
 ip6frag_high_thresh - INTEGER