[PATCH] net/ice: support Rx timestamp offload on vector path

[Penigalapati, Sandeep]

>Patch looks ok to me, and AI review finds no issues. I've flagged a couple of
>minor things below.
>
>Main concern is performance. What's the performance difference - if any -
>measured on this Rx path with this change compared to without?

Thanks for the review.

On E810, 64B single-core rxonly (--record-core-cycles, Rx core
saturated): with RTE_ETH_RX_OFFLOAD_TIMESTAMP enabled, the scalar
fallback was ~159 cyc/pkt; this patch keeps it on the vector path at
~78 (AVX512) / ~75 (AVX2), roughly a 2x reduction. The non-timestamp
path is unchanged.

>Patch needs a rebase, there is already a section in release notes for ice driver
>updates, and the ice.ini file has conflicting updates too (though both these
>are easy fixes)

Done in v2 - rebased, release note folded into the existing ice section,
ice.ini conflict resolved.

>Nit: I'd try to keep this on two lines rather than 3.

Fixed in v2.

Thanks,
Sandeep