[PATCH] net/mlx5: add timestamp ascending order error statistics

[Thomas Monjalon]

This patch is marked "Awaiting Upstream" in patchwork,
but it doesn't seem merged anywhere.
Please check its status.


20/04/2023 10:18, Viacheslav Ovsiienko:
> The ConnectX NICs support packet send scheduling on specified
> moment of time. Application can set the desired timestamp value
> in dynamic mbuf field and driver will push the special WAIT WQE
> to the hardware queue in order to suspend the entire queue
> operations till the specified time moment, then PMD pushes the
> regular WQE for packet sending.
> 
> In the following packets the scheduling can be requested again,
> with different timestamps, and driver pushes WAIT WQE accordingly.
> The timestamps should be provided by application in ascending
> order as packets are queued to the hardware queue, otherwise
> hardware would not be able to perform scheduling correctly -
> it discovers the WAIT WQEs in order as they were pushed, there is
> no any reordering - neither in PMD, not in the NIC, and, obviously,
> the regular hardware can't work as time machine and wait for some
> elapsed moment in the past.
> 
> Signed-off-by: Viacheslav Ovsiienko <viacheslavo at nvidia.com>