Re: [dpdk-dev] [PATCH v2] common/mlx5: add provider query port support to glue library

[David Marchand <david.marchand@redhat.com>]

On Sat, Jun 19, 2021 at 2:49 PM Viacheslav Ovsiienko
<viacheslavo@nvidia.com> wrote:
>
> The rdma-core mlx5 provider introduced the port attributes query
> API since version v35.0 - the mlx5dv_query_port routine. In order
> to support this change in the rdma-core the conditional compilation
> flag HAVE_MLX5DV_DR_DEVX_PORT_V35 is introduced by the this patch.
>
> In the OFED rdma-core version the new compatible mlx5dv_query_port
> routine was introduced as well, replacing the existing proprietary
> mlx5dv_query_devx_port routine. The proprietary routine was
> controlled in PMD code with HAVE_MLX5DV_DR_DEVX_PORT conditional
> flag.
>
> Currently, the OFED rdma-core library contains both versions of
> port query API. And this version is a transitional one, there are
> the plans to remove the proprietary mlx5dv_query_devx_port routine
> and the HAVE_MLX5DV_DR_DEVX_PORT flag in PMD will not work anymore.
>
> We had one more dependency on this flag in the code (for the
> mlx5dv_dr_action_create_dest_ib_port routine) and the patch
> fixes mentioned dependency also, by introducing the new
> dedicated conditional flag - HAVE_MLX5DV_DR_CREATE_DEST_IB_PORT.
>
> This patch is highly desirable to be provided in DPDK LTS releases
> due to it covers the major compatibility issue.

This patch is a fix, yet nothing tells this story in the title.
And the title does not reflect that it is a fix wrt versions of rdma-core.
Is this a build issue? or a runtime compat issue?

A good title makes life easier for users and people maintaining stable
versions of DPDK.


-- 
David Marchand