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Add more io_uring ZCRX definitions #158

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Related: bytecodealliance/rustix#1485

Submitting this as a draft until the rustix and rustix-uring PRs are ready.

Note that I changed IORING_ZCRX_AREA_SHIFT to a u64. I believe this is how it should be judging from its use in liburing for setting the rqe offset and for computing IORING_ZCRX_AREA_MASK.

CC @LtdJorge

@silvanshade silvanshade marked this pull request as ready for review July 5, 2025 02:27
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@sunfishcode I think this should be ready for review now. There might be some additional changes needed here to enable zcrx (see my comment) but I can't actually test that right now anyway.

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