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

[Eli Dorfman (Voltaire)]

Hal Rosenstock wrote:
> 
> 
> On Tue, Jul 28, 2009 at 6:14 AM, Moni Shoua <monis at voltaire.com
> <mailto:monis at voltaire.com>> wrote:
> 
>     Jason Gunthorpe wrote:
>     > On Mon, Jul 27, 2009 at 08:11:42PM +0300, Yossi Etigin wrote:
>     >>   If the LID of an ipoib neighbour changes without a SM event on
>     the local node,
>     >> IPoIB will keep caching the invalid path until the device is
>     flushed. The patch
>     >> below will remove the path for every incoming ARP packet where
>     the sender hardware
>     >> address does not match the cached lid.
>     >
>     > This assumes a LMC=0 fabric.. Otherwise there is no guarentee that the
>     > slid the sender uses is the same one you are using to send.
>     >
>     > Jason
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>     >
>     This issue can be solved by a little bit different check
>     instead of
>                    be16_to_cpu(path->pathrec.dlid) == lid)
>     do
>                    is_in_same_lid_group(be16_to_cpu(path->pathrec.dlid),
>     lid, lmc)
> 
>     what do you think?
> 
>  
> Is the LMC in the above from the local port ? Unfortunately, LMC is not
> required to be uniform across the subnet so the remote port's LMC may
> not be the same as that on the local port.

opensm configures the same LMC to all endports (CA) in the fabric so in which case do you suspect that
it will be different?

Eli
>  
> -- Hal
>  
> 
> 
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