[PATCH v4 0/6] replace rte atomics with GCC builtin atomics

[Tyler Retzlaff <roretzla@linux.microsoft.com>]

Replace the use of rte_atomic.h types and functions, instead use GCC
supplied C++11 memory model builtins.

This series covers the libraries and drivers that are built on Windows.

The code has be converted to use the __atomic builtins but there are
additional during conversion I notice that there may be some issues
that need to be addressed.

I'll comment in the patches where my concerns are so the maintainers
may comment.

v4:

  * drop patch for lib/ring it will be provided by ARM / Honnappa
  * rebase for changes in dma/idxd merge
  * adapt __atomic_fetch_sub(...) - 1 == 0 to be (__atomic_fetch_sub(...) == 1)
    as per feedback.
  * drop one /* NOTE: review for potential ordering optimization */ since
    the note reference non-critical to perf control path.

  note:

  Remainder of the NOTE comments have been retained since there
  seems to be no consensus but stronger opinion/argument to keep
  expressed. while I generally agree that changes should not
  include ``TODO'' style comments I also agree that without these
  comments in your face people are very unlikely to feel compelled
  to make the review they are trying to solicit without them. if
  it is absolute that the series won't be merged with them then I
  will remove them, but please be explicit soon.

v3:
  * style, don't use c99 comments

v2:
  * comment code where optimizations may be possible now that memory
    order can be specified.
  * comment code where operations should potentially be atomic so that
    maintainers can review.
  * change a couple of variables labeled as counters to be unsigned.

Tyler Retzlaff (6):
  stack: replace rte atomics with GCC builtin atomics
  dma/idxd: replace rte atomics with GCC builtin atomics
  net/ice: replace rte atomics with GCC builtin atomics
  net/ixgbe: replace rte atomics with GCC builtin atomics
  net/null: replace rte atomics with GCC builtin atomics
  net/ring: replace rte atomics with GCC builtin atomics

 drivers/dma/idxd/idxd_internal.h |  3 +--
 drivers/dma/idxd/idxd_pci.c      | 11 ++++++-----
 drivers/net/ice/ice_dcf.c        |  1 -
 drivers/net/ice/ice_dcf_ethdev.c |  1 -
 drivers/net/ice/ice_ethdev.c     | 12 ++++++++----
 drivers/net/ixgbe/ixgbe_bypass.c |  1 -
 drivers/net/ixgbe/ixgbe_ethdev.c | 18 ++++++++++++------
 drivers/net/ixgbe/ixgbe_ethdev.h |  3 ++-
 drivers/net/ixgbe/ixgbe_flow.c   |  1 -
 drivers/net/ixgbe/ixgbe_rxtx.c   |  1 -
 drivers/net/null/rte_eth_null.c  | 28 ++++++++++++++++++----------
 drivers/net/ring/rte_eth_ring.c  | 26 ++++++++++++++++----------
 lib/stack/rte_stack_lf_generic.h | 16 +++++++++-------
 13 files changed, 72 insertions(+), 50 deletions(-)

-- 
1.8.3.1