RE: [PATCH] net/mlx5: fix bond resource release

[Slava Ovsiienko <viacheslavo@nvidia.com>]

> -----Original Message-----
> From: Dariusz Sosnowski <dsosnowski@nvidia.com>
> Sent: Friday, August 4, 2023 8:16 PM
> To: Matan Azrad <matan@nvidia.com>; Slava Ovsiienko
> <viacheslavo@nvidia.com>; Ori Kam <orika@nvidia.com>; Suanming Mou
> <suanmingm@nvidia.com>; Jiawei(Jonny) Wang <jiaweiw@nvidia.com>
> Cc: dev@dpdk.org
> Subject: [PATCH] net/mlx5: fix bond resource release
> 
> When a port is spawned on top of mlx5 bonding device,
> the following TIS objects are created:
> 
> - TIS with index 0 - for default HW hash bonding mode,
> - TIS with index 1 - for sending packets on 1st physical port,
> - TIS with index 2 - for sending packets on 2nd physical port,
> - and so on.
> 
> These TIS objects are used according to configured Tx queue affinity,
> which was set up using rte_eth_dev_map_aggr_tx_affinity() API.
> 
> Before this patch, when DPDK was compiled in debug mode and
> RTE_LIBRTE_MLX5_DEBUG macro was declared, applications were asserting
> on failed call to destroy the TD object (on which TIS objects
> are dependent) during closing of the ports.
> Failure was caused by the fact that when TD object was destroyed, not
> all TIS objects were destroyed yet. This was caused by "off-by-one"
> issue in mlx5_free_shared_dev_ctx().
> This function was releasing n TIS objects, but it should
> release n + 1 objects, where n is number of aggregated ports.
> (n + 1, because there are n TIS objects for each physical port
> and 1 TIS object for default HW hash mode).
> 
> This patch fixes this issue in resource release of TIS objects.
> 
> Fixes: ce306af6341b ("net/mlx5: enhance Tx queue affinity")
> Cc: jiaweiw@nvidia.com
> 
> Signed-off-by: Dariusz Sosnowski <dsosnowski@nvidia.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo@nvidia.com>