RSS offload types are undocumented

https://bugs.dpdk.org/show_bug.cgi?id=1729

            Bug ID: 1729
           Summary: RSS offload types are undocumented
           Product: DPDK
           Version: 25.03
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: ethdev
          Assignee: [email protected]
          Reporter: [email protected]

Target Milestone: ---

A list of macros are defined for RSS offload types [1].
They have no descriptions, and some of them have very similar names, so it's unclear what exactly they mean.

Examples:
- Does RTE_ETH_RSS_IPV4 provide the same RSS offload as (RTE_ETH_RSS_FRAG_IPV4 | RTE_ETH_RSS_NONFRAG_IPV4_OTHER)?
- What does RTE_ETH_RSS_IPV6_EX do, compared to RTE_ETH_RSS_IPV6?

[1]: https://elixir.bootlin.com/dpdk/v25.03/source/lib/ethdev/rte_ethdev.h#L553

Each of these macros should be documented.

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