[dpdk-dev] [PATCH V6 0/3] support c11 memory model barrier in librte_ring

[Jia He <hejianet@gmail.com>]

To support C11 memory model barrier, 2 options are suggested by Jerin:
1. use rte_smp_rmb
2. use load_acquire/store_release
CONFIG_RTE_RING_USE_C11_MEM_MODEL is provided, and by default it is "y"
only on arm64 so far.

The reason why providing 2 options is due to the performance benchmark
difference in different arm machines.

Already fuctionally tested on the machines as follows:
- on X86
- on arm64 with CONFIG_RTE_RING_USE_C11_MEM_MODEL=y
- on arm64 with CONFIG_RTE_RING_USE_C11_MEM_MODEL=n

---
Changelog:
V6: minor change in subject and log
V5: split it into 2 patchset due to the milestone concerns, this is the 2st 
    one. Also fix checkpatch.pl warnings
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 (3):
  eal/arm64: remove the braces {} for dmb(),dsb()
  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                         | 173 ++----------------
 lib/librte_ring/rte_ring_generic.h                 | 195 +++++++++++++++++++++
 6 files changed, 220 insertions(+), 164 deletions(-)
 create mode 100644 lib/librte_ring/rte_ring_generic.h

-- 
2.7.4