Merge branch 'fix-page-fragment-handling-when-page_size-4k'

Dimitri Daskalakis says:

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Fix page fragment handling when PAGE_SIZE > 4K

FBNIC operates on fixed size descriptors (4K). When the OS supports pages
larger than 4K, we fragment the page across multiple descriptors.

While performance testing, I found several issues with our page fragment
handling, resulting in low throughput and potential RX stalls.
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Link: https://patch.msgid.link/20260324195123.3486219-1-dimitri.daskalakis1@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>