This series improves AF_XDP selftests by making timeout handling
explicit and fixing sources of non-determinism in xsk timeout tests.

Patch 1 introduces test_spec::poll_tmout and removes implicit
dependence on RX UMEM setup state for timeout behavior.

Patch 2 fixes thread harness sequencing by attaching XDP programs
before worker startup, removing signal-based termination, and using
barrier synchronization only for dual-thread runs.

Patch 3 restores shared_umem after POLL_TXQ_FULL so test-local
configuration does not leak into subsequent cases on shared-netdev
runs.

Together these changes make timeout handling easier to follow and
improve selftest stability, especially on real NIC runs.

Tushar Vyavahare (3):
  selftests/xsk: make poll timeout mode explicit
  selftests/xsk: fix timeout thread harness sequencing
  selftests/xsk: restore shared_umem after POLL_TXQ_FULL

 .../selftests/bpf/prog_tests/test_xsk.c       | 96 +++++++++++--------
 .../selftests/bpf/prog_tests/test_xsk.h       |  2 +
 2 files changed, 56 insertions(+), 42 deletions(-)

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2.43.0