patches for DPDK stable branches
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* [dpdk-stable] [PATCH 0/3] add lock-free stack support discovery
@ 2021-04-12  8:28 Stanislaw Kardach
  2021-04-12  8:28 ` [dpdk-stable] [PATCH 1/3] stack: update lock-free supported archs Stanislaw Kardach
                   ` (5 more replies)
  0 siblings, 6 replies; 14+ messages in thread
From: Stanislaw Kardach @ 2021-04-12  8:28 UTC (permalink / raw)
  To: Olivier Matz; +Cc: dev, Stanislaw Kardach, stable

The lock-free stack implementation (RTE_STACK_F_LF) is supported only on a
subset of platforms, namely x86_64 and arm64. Platforms supporting 128b atomics
have to opt-in to a generic or C11 implementations. All other platforms use a
stubbed implementation for push/pop operations which are basically NOPs.
However rte_stack_create() will not fail and application can proceed assuming
it has a working lock-free stack.

This means that among other things the stack_lf fast and perf tests will fail
as if implementation is wrong (which one can argue is). Therefore this patchset
tries to give user a way to check whether a lock_free is supported or not both
at compile time (build flag) and at runtime (ENOTSUP errno in rte_stack_create).

I have added cc to stable@dpdk.org because check-git-log.sh suggested it. I'm
not sure if adding a binary compatible change to API is worth stable@dpdk.org.

Cc: stable@dpdk.org

Stanislaw Kardach (3):
  stack: update lock-free supported archs
  stack: add compile flag for lock-free support
  test: run lock-free stack tests when supported

 app/test/test_stack.c                  | 4 ++++
 app/test/test_stack_perf.c             | 4 ++++
 doc/guides/rel_notes/release_21_05.rst | 4 ++++
 lib/librte_stack/rte_stack.c           | 4 +++-
 lib/librte_stack/rte_stack.h           | 3 ++-
 lib/librte_stack/rte_stack_lf.h        | 5 +++++
 6 files changed, 22 insertions(+), 2 deletions(-)

-- 
2.27.0


^ permalink raw reply	[flat|nested] 14+ messages in thread

end of thread, other threads:[~2021-05-04  6:45 UTC | newest]

Thread overview: 14+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-04-12  8:28 [dpdk-stable] [PATCH 0/3] add lock-free stack support discovery Stanislaw Kardach
2021-04-12  8:28 ` [dpdk-stable] [PATCH 1/3] stack: update lock-free supported archs Stanislaw Kardach
2021-04-27 13:54   ` Olivier Matz
2021-04-12  8:29 ` [dpdk-stable] [PATCH 2/3] stack: add lock-free support indication Stanislaw Kardach
2021-04-27 13:54   ` Olivier Matz
2021-04-12  8:29 ` [dpdk-stable] [PATCH 3/3] test: run lock-free stack tests when supported Stanislaw Kardach
2021-04-27 13:55   ` Olivier Matz
2021-04-16  6:34 ` [dpdk-stable] [dpdk-dev] [PATCH 0/3] add lock-free stack support discovery David Marchand
2021-04-19 14:44   ` Stanisław Kardach
2021-05-03 14:21 ` David Marchand
2021-05-03 14:28   ` Olivier Matz
2021-05-03 18:34     ` Stanisław Kardach
2021-05-04  6:44       ` David Marchand
2021-05-04  6:44 ` David Marchand

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