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neigh: support smaller retrans_time settting

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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.

v3: sync the behavior with IPv6 and update all the timer handler
v2: use HZ instead of hard code number

Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Hangbin Liu
2020-04-01 14:46:20 +08:00
committed by David S. Miller
parent 64948427a6
commit 19e16d220f
3 changed files with 12 additions and 9 deletions
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10
net/core/neighbour.c
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@@ -1065,11 +1065,12 @@ static void neigh_timer_handler(struct timer_list *t)
neigh->updated = jiffies;
atomic_set(&neigh->probes, 0);
notify = 1;
next = now + NEIGH_VAR(neigh->parms, RETRANS_TIME);
next = now + max(NEIGH_VAR(neigh->parms, RETRANS_TIME),
HZ/100);
}
} else {
/* NUD_PROBE|NUD_INCOMPLETE */
next = now + NEIGH_VAR(neigh->parms, RETRANS_TIME);
next = now + max(NEIGH_VAR(neigh->parms, RETRANS_TIME), HZ/100);
}
if ((neigh->nud_state & (NUD_INCOMPLETE | NUD_PROBE)) &&
@@ -1125,7 +1126,7 @@ 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 {
@@ -1427,7 +1428,8 @@ void __neigh_set_probe_once(struct neighbour *neigh)
neigh->nud_state = NUD_INCOMPLETE;
atomic_set(&neigh->probes, neigh_max_probes(neigh));
neigh_add_timer(neigh,
jiffies + NEIGH_VAR(neigh->parms, RETRANS_TIME));
jiffies + max(NEIGH_VAR(neigh->parms, RETRANS_TIME),
HZ/100));
}
EXPORT_SYMBOL(__neigh_set_probe_once);