[Bug 294491] netmap vale using offsets when it shouldn't

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=294491

Teddy Engel <[email protected]> changed:

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--- Comment #2 from Teddy Engel <[email protected]> ---
Thanks for the fixes, Giuseppe. 

I've backported both commits (ef8fa11e3, e0de5b529) to FreeBSD 16.0-CURRENT and
tested them with a custom program that sends packets through VALE with various
buffer offsets (0–63), verifying data integrity on vp-to-vp and vp-to-iflib
paths.

I've opened a PR for review: https://github.com/freebsd/freebsd-src/pull/2317

Regarding NS_INDIRECT — I noticed the patch also stops calling
nm_write_offset() for indirect packets, which fixes the bogus offset write the
reporter described.

The other NS_INDIRECT concerns (copy_len including offset bytes, over-copy) are
pre-existing and I left them as-is to match upstream. Happy to look into those
separately if useful.

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