Re: [RFC PATCH] RDMA/rxe: Export imm_data to WC when the related WR with imm_data finished on SQ

Leon Romanovsky
2021-01-27T12:07:29Z

On Wed, Jan 27, 2021 at 04:24:31PM +0800, Xiao Yang wrote:
> Even if we enable sq_sig_all or IBV_SEND_SIGNALED, current rxe
> module cannot set imm_data in WC when the related WR with imm_data
> finished on SQ.
>
> Signed-off-by: Xiao Yang <yangx.jy@cn.fujitsu.com>
> ---
>
> Current rxe module and other rdma modules(e.g. mlx5) only set
> imm_data in WC when the related WR with imm_data finished on RQ.
> I am not sure if it is a expected behavior.

This is IBTA behavior.

5.2.11 IMMEDIATE DATA EXTENDED TRANSPORT HEADER (ImmDt) - 4 BYTES
"Immediate Data (ImmDt) contains data that is placed in the receive
Completion Queue Element (CQE). The ImmDt is only allowed in SEND or
RDMA WRITE packets with Immediate Data."

If I understand the spec, you shouldn't set imm_data in SQ.

Thanks