[ewg] [PATCH 3/9] ib_core: RDMAoE support only QP1

[Eli Cohen]

On Mon, Jun 15, 2009 at 02:26:42PM -0400, Hal Rosenstock wrote:
> Should ib_post_send_mad return some error on QP0 sends on RDMAoE ports ?
You can't send anything over QP0 because it is not created and so
there are no data structs corresponding to it.

> What QP1 sends are allowed ?
Basically, all QP1 sends are allowed without any changes - QP1
functions as normal.
However, RDMAoE will initially support only the CM. In the future, we
can support additional QP1 services.

> Is it only SA sends which are faked ?
Yes

> How
> are others handled ? These questions are important to what happens to
> the IB management/diag tools when invoked on an RDMAoE port. We need
> to be able to handle that scenario cleanly.
You should be able to to send MADs over QP1 from the kernel. I did not
make any tests as for sending MADs from userspace but I can't think of
a reason why this would be a problem.

> 
> Is something similar needed in ib_mad_port_close for handling no QP0
> on RDMAoE ports in terms of destroy_mad_qp/cleanup_recv_queue calls ?
> 
No, becuase it is handled inside destroy_mad_qp():

        if (!qp_info->qp)
                return;