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From: Stanislaw Kardach <kda@semihalf.com>
To: Olivier Matz <olivier.matz@6wind.com>
Cc: dev@dpdk.org, Stanislaw Kardach <kda@semihalf.com>, stable@dpdk.org
Subject: [dpdk-dev] [PATCH 0/3] add lock-free stack support discovery
Date: Mon, 12 Apr 2021 10:28:58 +0200	[thread overview]
Message-ID: <20210412082901.652736-1-kda@semihalf.com> (raw)

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(-)


             reply	other threads:[~2021-04-12  8:29 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-12  8:28 Stanislaw Kardach [this message]
2021-04-12  8:28 ` [dpdk-dev] [PATCH 1/3] stack: update lock-free supported archs Stanislaw Kardach
2021-04-27 13:54   ` Olivier Matz
2021-04-12  8:29 ` [dpdk-dev] [PATCH 2/3] stack: add lock-free support indication Stanislaw Kardach
2021-04-27 13:54   ` Olivier Matz
2021-04-12  8:29 ` [dpdk-dev] [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-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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