Re: how to re-use a QP for a new connection

[Shirley Ma <shirley.ma-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>]

The QP can be reused. The rdma_id_private has a field reuseaddr. What additional change is needed besides rdma_set_reuseaddr?

Shirley

On 06/20/2014 02:17 PM, Hefty, Sean wrote:
>> During a remote transport disconnect, the QP leaves RTS.
>>
>> xprtrdma deals with this in a separate transport connect worker process,
>> where it creates a new id and qp, and replaces the existing id and qp.
>>
>> Unfortunately there are parts of xprtrdma (namely FRMR deregistration)
>> that are not easy to serialize with this reconnect logic.
>>
>> Re-using the QP would mean no serialization would be needed between
>> transport reconnect and FRMR deregistration.
>>
>> If QP re-use is not supported, though, it's not worth considering any
>> further.
> 
> It may be possible to reuse the QP, just not the rdma_cm_id without additional code changes.  Reuse of the rdma_cm_id may also require changes in the underlying IB/iWarp CMs.
> --
> To unsubscribe from this list: send the line "unsubscribe linux-rdma" in
> the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> 
--
To unsubscribe from this list: send the line "unsubscribe linux-rdma" in
the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html