Re: [PATCH net-next v3 0/4] selftests/xsk: improve shared-UMEM coverage

On 8/19/26 4:44 AM, Tushar Vyavahare wrote:

AF_XDP shared-UMEM support in the existing XSK selftests is limited to
a small set of scenarios, while the supporting setup and cleanup paths
become fragile as coverage expands.

This series improves shared-UMEM testing and infrastructure in four
steps.

Patch 1 makes UMEM ownership explicit with refcounting and centralizes
socket and UMEM teardown, keeping cleanup behavior consistent across
normal completion and error paths. A UMEM that survives teardown now
fails the test instead of leaking silently.

Patch 2 prevents TX setup when RX socket configuration has already
failed. This avoids shared-UMEM TX setup relying on incomplete RX-side
socket and UMEM state.

Patch 3 expands XSKMAP and test capacity to four sockets and adds a
length-based XDP steering program. The classifier uses total
XDP-visible packet length (data_end - data) and SHARED_UMEM_LEN_SPLIT.

Patch 4 adds the shared-UMEM callback runner and initial 4-socket,
length-based steering, uneven-distribution, and unaligned-chunk test
cases. The three packet-stream sequences share one transactional helper
that stages replacement streams and publishes them into the socket
arrays only after every allocation has succeeded.

Together, these patches strengthen shared-UMEM setup and cleanup and
extend selftest coverage to multi-socket and packet-distribution
scenarios.

## Form letter - net-next-closed

We have already submitted our pull request with net-next material for v7.3,
and therefore net-next is closed for new drivers, features, code refactoring
and optimizations. We are currently accepting bug fixes only.

Please repost when net-next reopens after Aug 31st.

RFC patches sent for review only are obviously welcome at any time.

See: https://www.kernel.org/doc/html/next/process/maintainer-netdev.html#development-cycle