RE: [PATCH] net/mlx5: fix check for orphan wait descriptor

[Raslan Darawsheh <rasland@nvidia.com>]

Hi,

> -----Original Message-----
> From: Slava Ovsiienko <viacheslavo@nvidia.com>
> Sent: Thursday, August 11, 2022 8:51 AM
> To: dev@dpdk.org
> Cc: ferruh.yigit@intel.com; Matan Azrad <matan@nvidia.com>; Raslan
> Darawsheh <rasland@nvidia.com>; stable@dpdk.org
> Subject: [PATCH] net/mlx5: fix check for orphan wait descriptor
> 
> The mlx5 PMD supports send scheduling feature, it allows
> to send packets at specified moment of time, to do that
> PMD pushes special wait descriptor (WQE) to the hardware
> queue and then pushes descriptor for packet data as usual.
> If queue is close to be full or there is no enough elts
> buffers to store mbufs being sent the data descriptors might
> be not pushed and the orphan wait WQE (not followed by the
> data) might reside in queue on tx_burst routine exit.
> 
> To avoid orphan wait WQEs there was the check for enough
> free space in the queue WQE buffer and enough amount of the
> free elts in queue mbuf storage. This check was incomplete
> and did not cover all the cases for Enhanced Multi-Packet
> Write descriptors.
> 
> Fixes: 2f827f5ea6e1 ("net/mlx5: support scheduling on send routine
> template")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Viacheslav Ovsiienko <viacheslavo@nvidia.com>
Patch applied to next-net-mlx,

Kindest regards,
Raslan Darawsheh