[PATCH v3 0/2] ring: replace use of rte_atomic

[Stephen Hemminger]

This is part of the broader rte_atomic32 deprecation work, sent
separately because it is the most complex part and benefits from
independent review.

Convert lib/ring off rte_atomic32 and onto the C11 memory model,
except for the ring head compare-and-swap where special case
is needed. On x86 with GCC using C11 atomics produces measurably
worse code.

After this series only __rte_ring_headtail_move_head has separate
C11 and GCC-builtin implementations; everything else uses the same
code on all architectures. The default RTE_USE_C11_MEM_MODEL
selection per architecture is unchanged.

v3:
  - rebase and squash patches
  - keep original code for x86 single thread case

Stephen Hemminger (2):
  ring: split single thread vs multi-thread cases
  ring: replace rte_atomic32 with __sync builtin

 lib/ring/meson.build             |   2 +-
 lib/ring/rte_ring_c11_pvt.h      | 107 +++++++++++++--------
 lib/ring/rte_ring_elem_pvt.h     |  53 ++++++++---
 lib/ring/rte_ring_gcc_pvt.h      | 155 +++++++++++++++++++++++++++++++
 lib/ring/rte_ring_generic_pvt.h  | 119 ------------------------
 lib/ring/rte_ring_hts_elem_pvt.h |   8 +-
 lib/ring/soring.c                |  34 ++++---
 7 files changed, 289 insertions(+), 189 deletions(-)
 create mode 100644 lib/ring/rte_ring_gcc_pvt.h
 delete mode 100644 lib/ring/rte_ring_generic_pvt.h

-- 
2.53.0