Re: [PATCH v1 1/2] net/dpaa2: revert inner RSS level support

[Thomas Monjalon <thomas@monjalon.net>]

I'm waiting for an urgent reply from the maintainers here.


20/07/2026 15:34, Maxime Leroy:
> This reverts commit 618a06c53d479ae576ff01c7d274b10c60b3d3d5.
> 
> RTE_ETH_RSS_LEVEL_INNERMOST was mapped to the innermost IP instance by
> programming the IP key extracts with hdr_index = HDR_INDEX_LAST. The
> hardware only resolves that index when several IP headers are stacked.
> A non-tunnelled frame carries a single IP header, so the extract
> resolves to nothing, the RSS hash is constant and every such frame is
> steered to a single Rx queue.
> 
> The ethdev API defines INNERMOST by encapsulation level, not by the
> presence of a tunnel: a plain frame's innermost header is its only IP
> header and must be hashed. The dpaa2 hardware cannot honour that and
> keep true inner-only semantics for tunnelled traffic at the same time,
> so the level cannot be implemented correctly as merged.
> 
> Revert it. Hashing the outer plus the inner IP under the PMD default
> level, which spreads both plain and tunnelled traffic, is added in a
> follow-up.
> 
> Signed-off-by: Maxime Leroy <maxime@leroys.fr>