Re: [dpdk-dev] [PATCH] net/mlx5: fix Tx queues creation type check for scheduling

Hi,

-----Original Message-----
From: Slava Ovsiienko <redacted>
Sent: Thursday, July 29, 2021 3:27 PM
To: dev@dpdk.org
Cc: Raslan Darawsheh <redacted>; Matan Azrad
[off-list ref]; stable@dpdk.org
Subject: [PATCH] net/mlx5: fix Tx queues creation type check for scheduling

The send scheduling on timestamp offload requires the Send
Queue (SQ) shares its User Access Region (UAR) with the
pacing Clock Queue. The SQ can be created by mlx5 PMD either
with DevX or with Verbs. If the SQ is being created with
DevX the dedicated UAR can be specified and all the SQs
share the single UAR. Once SQ is being created with Verbs
the SQ's UAR is allocated by the rdma-core library internally
on its own and there are no UAR sharing. This caused hardware
errors on WAIT WQEs and overall send scheduling malfunction.

If SQs are going to be created with Verbs and the send
scheduling offload is explicitly requested via tx_pp devarg
the device probing is rejected as device configuration
can't satisfy the requirements.

Fixes: 3ec73abeed52 ("net/mlx5/linux: fix Tx queue operations decision")
Fixes: 8f848f32fc24 ("net/mlx5: introduce send scheduling devargs")
Cc: stable@dpdk.org

Signed-off-by: Viacheslav Ovsiienko <redacted>

Patch applied to next-net-mlx,

Kindest regards,
Raslan Darawsheh