[PATCH] net/tap: add deprecation notice for RTE_FLOW_ACTION_RSS

[Stephen Hemminger]

On Thu, 14 Dec 2023 09:49:51 -0800
Stephen Hemminger <stephen at networkplumber.org> wrote:

> The BPF infrastructure in kernel changed which broke the method
> being used to load the RSS part of rte_flow in the TAP device.
> Since this is a little used feature, and fixing the problem would
> be moderately complex and create new dependency on libbpf,
> mark the feature as deprecated and plan for removal.
> 
> Signed-off-by: Stephen Hemminger <stephen at networkplumber.org>
> ---
>  doc/guides/rel_notes/deprecation.rst | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/doc/guides/rel_notes/deprecation.rst b/doc/guides/rel_notes/deprecation.rst
> index 81b93515cbd9..7d9012ada2d7 100644
> --- a/doc/guides/rel_notes/deprecation.rst
> +++ b/doc/guides/rel_notes/deprecation.rst
> @@ -146,3 +146,8 @@ Deprecation Notices
>    will be deprecated and subsequently removed in DPDK 24.11 release.
>    Before this, the new port library API (functions rte_swx_port_*)
>    will gradually transition from experimental to stable status.
> +
> +* tap: The support for RTE_FLOW_ACTION_TYPE_RSS is deprecated and
> +  will be removed in DPDK 24.11 release. It is already broken on recent
> +  Linux kernels due to changes in how BPF programs are loaded,
> +  and will not be fixed.

See DPDK bugzilla 1329
https://bugs.dpdk.org/show_bug.cgi?id=1329