[dpdk-dev] [PATCH v5 0/1] fix race condition in enqueue/dequeue because of cpu reorder

[Jia He]

We watched a rte panic of mbuf_autotest in our qualcomm arm64 server due
to a possible race condition. To fix this race condition, rmb() is needed to add
between the 2 loads.

Already fuctionally tested on the machines as follows:
- on X86
- on arm64 

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Changelog
V5: split it into 2 patchset due to the milestone concerns, this is the 1st one
V4: split into small patches
V3: arch specific implementation for enqueue/dequeue barrier
V2: let users choose whether using load_acquire/store_release
V1: rte_smp_rmb() between 2 loads

Jia He (4):
  eal/arm64: remove the braces {} for dmb() and dsb()
  ring: guarantee load/load order in enqueue and dequeue
  ring: introduce new header file to include common functions
  ring: introduce new header file to support C11 memory model

 config/common_armv8a_linuxapp                      |   2 +
 .../common/include/arch/arm/rte_atomic_64.h        |   4 +-
 lib/librte_eventdev/rte_event_ring.h               |   6 +-
 lib/librte_ring/Makefile                           |   4 +-
 lib/librte_ring/rte_ring.h                         | 161 ++---------------
 lib/librte_ring/rte_ring_c11_mem.h                 | 185 ++++++++++++++++++++
 lib/librte_ring/rte_ring_generic.h                 | 194 +++++++++++++++++++++
 7 files changed, 404 insertions(+), 152 deletions(-)
 create mode 100644 lib/librte_ring/rte_ring_c11_mem.h
 create mode 100644 lib/librte_ring/rte_ring_generic.h

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2.7.4