netdev - Re: [PATCH] neighbour: fix base_reachable_time(_ms) not effective immediatly when changed

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Date:	Wed, 14 Jan 2015 00:28:41 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	jeff@...ix.org
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH] neighbour: fix base_reachable_time(_ms) not effective
 immediatly when changed

From: Jean-Francois Remy <jeff@...ix.org>
Date: Wed, 14 Jan 2015 04:22:39 +0100

> When setting base_reachable_time or base_reachable_time_ms on a
> specific interface through sysctl or netlink, the reachable_time
> value is not updated.
> 
> This means that neighbour entries will continue to be updated using the
> old value until it is recomputed in neigh_period_work (which
>     recomputes the value every 300*HZ).
> On systems with HZ equal to 1000 for instance, it means 5mins before
> the change is effective.
> 
> This patch changes this behavior by recomputing reachable_time after
> each set on base_reachable_time or base_reachable_time_ms.
> The new value will become effective the next time the neighbour's timer
> is triggered.
> 
> Changes are made in two places: the netlink code for set and the sysctl
> handling code. For sysctl, I use a proc_handler. The ipv6 network
> code does provide its own handler but it already refreshes
> reachable_time correctly so it's not an issue.
> Any other user of neighbour which provide its own handlers must
> refresh reachable_time.
> 
> Signed-off-by: Jean-Francois Remy <jeff@...ix.org>

Applied, thanks.
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