[PATCH v2 0/8] Add stack library and new mempool handler

[Gage Eads <gage.eads@intel.com>]

This patchset introduces a stack library, supporting both lock-based and
lock-free stacks, and a lock-free stack mempool handler.

The lock-based stack code is derived from the existing stack mempool handler,
and that handler is refactored to use the stack library.

The lock-free stack mempool handler is intended for usages where the rte
ring's "non-preemptive" constraint is not acceptable; for example, if the
application uses a mixture of pinned high-priority threads and multiplexed
low-priority threads that share a mempool.

Note that the lock-free algorithm relies on a 128-bit compare-and-swap[1],
so it is currently limited to the x86_64 platform.

This patchset is the successor to a patchset containing only the new mempool
handler[2].

[1] http://mails.dpdk.org/archives/dev/2019-March/125751.html
[2] http://mails.dpdk.org/archives/dev/2019-January/123555.html

---
v2:
- Reworked structure and function naming to use rte_stack_{std, lf}_...
- Updated to the latest rte_atomic128_cmp_exchange() interface.
- Rename STACK_F_NB -> RTE_STACK_F_LF.
- Remove rte_rmb() and rte_wmb() from the generic push and pop implementations.
  These are obviated by rte_atomic128_cmp_exchange()'s two memorder arguments.
- Edit stack_lib.rst text to 80 chars/line.
- Fix rte_stack.h doxygen formatting.
- Allocate popped_objs array from the heap
- Fix stack_thread_push_pop bug ("&t->sz" -> "t->sz")
- Remove unnecessary NULL check from test_stack_basic
- Properly terminate the name string in test_stack_name_length
- Add an empty array of struct rte_nb_lifo_elem elements
- In rte_nb_lifo_push(), retrieve the last element from __nb_lifo_pop()
- Split C11 implementation into a separate patchset

Gage Eads (8):
  stack: introduce rte stack library
  mempool/stack: convert mempool to use rte stack
  test/stack: add stack test
  test/stack: add stack perf test
  stack: add lock-free stack implementation
  stack: add C11 atomic implementation
  test/stack: add lock-free stack tests
  mempool/stack: add lock-free stack mempool handler

 MAINTAINERS                                     |   9 +-
 config/common_base                              |   5 +
 doc/api/doxy-api-index.md                       |   1 +
 doc/api/doxy-api.conf.in                        |   1 +
 doc/guides/prog_guide/env_abstraction_layer.rst |  10 +
 doc/guides/prog_guide/index.rst                 |   1 +
 doc/guides/prog_guide/stack_lib.rst             |  83 +++++
 doc/guides/rel_notes/release_19_05.rst          |  13 +
 drivers/mempool/stack/Makefile                  |   3 +-
 drivers/mempool/stack/meson.build               |   6 +-
 drivers/mempool/stack/rte_mempool_stack.c       | 115 +++----
 lib/Makefile                                    |   2 +
 lib/librte_stack/Makefile                       |  25 ++
 lib/librte_stack/meson.build                    |  10 +
 lib/librte_stack/rte_stack.c                    | 219 ++++++++++++
 lib/librte_stack/rte_stack.h                    | 395 ++++++++++++++++++++++
 lib/librte_stack/rte_stack_c11_mem.h            | 175 ++++++++++
 lib/librte_stack/rte_stack_generic.h            | 151 +++++++++
 lib/librte_stack/rte_stack_pvt.h                |  34 ++
 lib/librte_stack/rte_stack_version.map          |   9 +
 lib/meson.build                                 |   2 +-
 mk/rte.app.mk                                   |   1 +
 test/test/Makefile                              |   3 +
 test/test/meson.build                           |   7 +
 test/test/test_stack.c                          | 423 ++++++++++++++++++++++++
 test/test/test_stack_perf.c                     | 356 ++++++++++++++++++++
 26 files changed, 1987 insertions(+), 72 deletions(-)
 create mode 100644 doc/guides/prog_guide/stack_lib.rst
 create mode 100644 lib/librte_stack/Makefile
 create mode 100644 lib/librte_stack/meson.build
 create mode 100644 lib/librte_stack/rte_stack.c
 create mode 100644 lib/librte_stack/rte_stack.h
 create mode 100644 lib/librte_stack/rte_stack_c11_mem.h
 create mode 100644 lib/librte_stack/rte_stack_generic.h
 create mode 100644 lib/librte_stack/rte_stack_pvt.h
 create mode 100644 lib/librte_stack/rte_stack_version.map
 create mode 100644 test/test/test_stack.c
 create mode 100644 test/test/test_stack_perf.c

-- 
2.13.6