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Changing xdp_umem_reg definition #1221

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@tgross35

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@tgross35

Linux 6.12 added a new field to xdp_umem_reg, tx_metadata_len (patch). We have a PR to add this field to libc at rust-lang/libc#3956, and based on an informal search it seems like rustix might be about the only crate making use of this type currently. Is there any way we could add this field to libc without breaking things for rustix?

Considering this is a break in uapi I think we probably have some leeway making a breaking change on our end too, but I want to be sure it won't cause a build failure for everyone using rustix.

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