selftests/net: ncdevmem: add -b option to set rx-page-size on bind

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Add -b <bytes> to request a non-default niov size via
NETDEV_A_DMABUF_RX_PAGE_SIZE. When the value exceeds PAGE_SIZE,
udmabuf_alloc() switches to an MFD_HUGETLB-backed memfd so each 2 MB
hugepage produces one naturally-aligned sg entry.

Acked-by: Stanislav Fomichev <sdf@fomichev.me>
Reviewed-by: Nikolay Aleksandrov <razor@blackwall.org>
Signed-off-by: Bobby Eshleman <bobbyeshleman@meta.com>
Link: https://patch.msgid.link/20260805-tcpdm-large-niovs-v8-2-3e0225e2808c@meta.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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Bobby Eshleman 2026-08-05 13:42:44 -07:00 • committed by Jakub Kicinski

parent b27a8560ee

commit 3e8c9ec4eb

1 changed files with 33 additions and 3 deletions

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tools/testing/selftests/drivers/net/hw/ncdevmem.c

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