[ofa-general] Re: [ewg] [PATCH 2/8 v3] ib_core: RDMAoE support only QP1

[Hal Rosenstock]

On Tue, Jul 14, 2009 at 3:46 AM, Eli Cohen<eli at dev.mellanox.co.il> wrote:
> On Mon, Jul 13, 2009 at 03:26:34PM -0400, Hal Rosenstock wrote:
>> On Mon, Jul 13, 2009 at 2:14 PM, Eli Cohen<eli at mellanox.co.il> wrote:
>> > Since RDMAoE is using Ethernet as its link layer, there is no need for QP0. QP1
>> > is still needed since it handles communications between CM agents. This patch
>> > will create only QP1 for RDMAoE ports.
>>
>> What happens with other QP1 traffic (other than CM and SA) ?
> I think it should work but I haven't tried that.

Would you ? You could try tools from infiniband-diags or ibdiagnet.

>> Userspace
>> can access QP1 (and QP0).
> QP0 is not accessible since ib_register_mad_agent() will fail for QP0
> becuase of this:
>
>        if (!port_priv->qp_info[qp_type].qp)
>                return NULL;
>
> QP1 should work in the same way

So what happens with things like PerfMgt class ? I think it ends up
timing out if no receiver consumer is present.

>> Does QP0 error out ? What about QP1 ? Does
>> it just timeout ? If so, a direct error would be better.
>>
>
> See above - you can't access QP0. Do you know of a utility from
> userspace which sends/receives MADs on QP0 or QP1?

Yes, opensm, infiniband-diags (various), and ibutils (ibdiagnet, etc).

-- Hal