[ofa-general] [PATCH] ipoib: refresh path when remote lid changes

[Yossi Etigin]

On 04/08/09 07:56, Jason Gunthorpe wrote:
> On Mon, Aug 03, 2009 at 08:03:14PM +0300, Yossi Etigin wrote:
> 
>> The ARP stuff works this way: Remote LID changes. In some point, either the remote
>> node will send an ARP reply (gratuitous), or (more likely) the local network stack
>> will start sending solicited ARPs, unicast, using the invalid path. They will fail,
>> so the stack will send broadcast ARP.
> 
> Erm.. Maybe a little tighter integration with the ARP/ND layer is in
> order. If it knows unicast isn't working thats a pretty damn good clue
> to discard the PR.
> 
> Jason

I agree with that. If the network stack told ipoib when the neighbour became
unreachable, life would have been a lot easier. Unfortunately, the closest thing
now is neigh_cleanup, and this is only called when neighbour entry removed from
the table (which may be quite some time after it becomes unreachable).

--Yossi