netdev - Re: [PATCH net] neigh: Force garbage collection if an entry is deleted administratively

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Date:	Thu, 21 Nov 2013 14:18:13 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	steffen.klassert@...unet.com
Cc:	David.Laight@...LAB.COM, yoshfuji@...ux-ipv6.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH net] neigh: Force garbage collection if an entry is
 deleted administratively

From: Steffen Klassert <steffen.klassert@...unet.com>
Date: Tue, 19 Nov 2013 13:41:02 +0100

> We have the table locked in neigh_periodic_work() so we can unlink
> invalidated entries there. This function could then periodically
> check and remove the unlinked entries if they lost their references.
> Unlinking with neigh_periodic_work() would have some seconds delay
> of course, but I think this is acceptable.

Create an "invalidated_list", and at the moment the neigh is
administratively deleted you can remove it from the hash table and
link it into this new list.

Then neigh_periodic_work() can scan both the hash tables and this
"invalidated_list" for refcnt==1 entries.

It seems a good solution, and should avoid the need to handle
forcibly freeing a neigh which still has external references.
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