netdev - [PATCHv2 net-next] neigh: support smaller retrans

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Date:   Wed,  1 Apr 2020 10:07:49 +0800
From:   Hangbin Liu <liuhangbin@...il.com>
To:     netdev@...r.kernel.org
Cc:     David Miller <davem@...emloft.net>, eric.dumazet@...il.com,
        Hangbin Liu <liuhangbin@...il.com>
Subject: [PATCHv2 net-next] neigh: support smaller retrans_time settting

Currently, we limited the retrans_time to be greater than HZ/2. i.e.
setting retrans_time less than 500ms will not work. This makes the user
unable to achieve a more accurate control for bonding arp fast failover.

Update the sanity check to HZ/100, which is 10ms, to let users have more
ability on the retrans_time control.

v2: use HZ instead of hard code number

Signed-off-by: Hangbin Liu <liuhangbin@...il.com>
---
 net/core/neighbour.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index 5bf8d22a47ec..46a5611a9f3d 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -1125,7 +1125,7 @@ int __neigh_event_send(struct neighbour *neigh, struct sk_buff *skb)
 			neigh->nud_state     = NUD_INCOMPLETE;
 			neigh->updated = now;
 			next = now + max(NEIGH_VAR(neigh->parms, RETRANS_TIME),
-					 HZ/2);
+					 HZ/100);
 			neigh_add_timer(neigh, next);
 			immediate_probe = true;
 		} else {
-- 
2.19.2