[openib-general] [PATCH] ib_cm: randomize starting local comm IDs

[Michael S. Tsirkin]

Quoting r. Or Gerlitz <or.gerlitz at gmail.com>:
> Subject: Re: [PATCH] ib_cm: randomize starting local comm IDs
> 
> On 8/22/06, Sean Hefty <sean.hefty at intel.com> wrote:
> > Randomize the starting local comm ID to avoid getting a rejected connection
> > due to a stale connection after a system reboot or reloading of the ib_cm.
> 
> Hi Sean,
> 
> I have tested the patch against an iser target based on our Gen1 CM -
> it works as expected.
> 
> So the CM at the target side rejects the first REQ after the client
> reboot with STALE reason (and deliveres a disconnect event to the
> ULP). The second REQ is processed fine and a new connection is
> established.
> 
> Without the patch, since the REQ had <local_id,qpn> as this of an
> existing connection, it was just silently dropped and a target reboot
> was a must to let the initiator reconnect !
> 
> Or.

Hmm. Might this still be a concern for users such as SDP
which don't retry connections?

-- 
MST