Merge branch 'net-mlx5e-prevent-stale-xsk-buffer-release-on-refill-retries'

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Jerome Tollet says:

====================
net/mlx5e: Prevent stale XSK buffer release on refill retries

Prevent duplicate XSK buffer release when a deferred RX refill fails and
the same WQE is retried.

Patch 1 fixes legacy cyclic RQ. It is unchanged from v3 and retains
Dragos' Reviewed-by tag.

Patch 2 fixes the analogous striding-RQ MPWQE path. Following Dragos'
review, it now fills skip_release_bitmap in the common error path of
mlx5e_xsk_alloc_rx_mpwqe(), consistently with mlx5e_alloc_rx_mpwqe().

Targeted fault injection covered both an early allocation failure and a
partial 8-of-16-buffer unwind. With three consecutive failures for one
MPWQE, the original 16 XSK buffers were released only once, retries saw a
full bitmap, and a later successful allocation cleared it. A clean
20-second AF_XDP zero-copy pressure run exercised 1,575,262 buffer
allocation failures without invalid descriptors, WQE errors, or kernel
warnings.
====================

Link: https://patch.msgid.link/20260824141645.23700-1-jtollet@cisco.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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Jakub Kicinski 2026-08-28 15:39:17 -07:00

parent a5d946466a 63811edf51

commit b873bf8141

2 changed files with 7 additions and 2 deletions

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2

drivers/net/ethernet/mellanox/mlx5/core/en/xsk/rx.c

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7

drivers/net/ethernet/mellanox/mlx5/core/en_rx.c

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