This series extends the iou-zcrx selftests to be multithreaded while
preserving existing single-threaded tests.

Patches 1 and 2 are prep fixes/cleanups. Patch 3 refactors the server's
global state. Patches 4 and 5 add the multithreaded client and server.
Finally, patch 6 adds the python side multithreaded test case.

Changes since v4:
- In patch 4, make cfg_num_threads the default value and remove
  CONNS_PER_THREAD and associated ternary (David)
- Use reverse christmas tree for variables (Paolo, David)
- Address race condition identified by Sashiko (Paolo)
- use thread barriers to get rid of epoll in the main thread (David)
- Make napi id matcher helper take a connfd as a param and return the
  index directly (David)


v4: https://lore.kernel.org/netdev/20260729221825.42773-1-juanlu@fastmail.com/
v3: https://lore.kernel.org/netdev/20260722203950.58550-1-juanlu@fastmail.com/
v2: https://lore.kernel.org/netdev/20260418094907.3cde57ca@kernel.org/
v1: https://lore.kernel.org/netdev/20260408163816.2760-1-juanlu@fastmail.com/

Juanlu Herrero (6):
  selftests: net: fix get_refill_ring_size() to use its local variable
  selftests: net: remove unused variable in process_recvzc()
  selftests: net: refactor server state into struct thread_ctx
  selftests: net: add multithread client support to iou-zcrx
  selftests: net: add multithread server support to iou-zcrx
  selftests: net: add rss_multiqueue test variant to iou-zcrx

 .../testing/selftests/drivers/net/hw/Makefile |   7 +-
 .../selftests/drivers/net/hw/iou-zcrx.c       | 406 ++++++++++++------
 .../selftests/drivers/net/hw/iou-zcrx.py      |  50 ++-
 3 files changed, 332 insertions(+), 131 deletions(-)


base-commit: 3da8c3c8b8fa99505624b65ef590482f48e766b6
-- 
2.53.0-Meta