[dpdk-dev] [PATCH v3 0/4] Allow using external memory without malloc

[Anatoly Burakov]

Currently, the only way to use externally allocated memory
is through rte_malloc API's. While this is fine for a lot
of use cases, it may not be suitable for certain other use
cases like manual memory management, etc.

This patchset adds another API to register memory segments
with DPDK (so that API's like ``rte_mem_virt2memseg`` could
be relied on by PMD's and such), but not create a malloc
heap out of them.

Aside from the obvious (not adding memory to a heap), the
other major difference between this API and the
``rte_malloc_heap_*`` external memory functions is the fact
that no DMA mapping is performed automatically, as well as
no mem event callbacks are triggered.

This really draws a line in the sand, and there are now two
ways of doing things - do everything automatically (using
the ``rte_malloc_heap_*`` API's), or do everything manually
(``rte_extmem_*`` and future DMA mapping API [1] that would
replace ``rte_vfio_dma_map``). This way, the consistency of
API is kept, and flexibility is also allowed.

[1] https://mails.dpdk.org/archives/dev/2018-November/118175.html

v3:
- Rebase on latest master

v2:
- More sanity checking of parameters

Anatoly Burakov (4):
  malloc: separate creating memseg list and malloc heap
  malloc: separate destroying memseg list and heap data
  mem: allow registering external memory areas
  mem: allow usage of non-heap external memory in multiprocess

 .../prog_guide/env_abstraction_layer.rst      |  63 +++++++--
 doc/guides/rel_notes/release_19_02.rst        |   7 +
 lib/librte_eal/common/eal_common_memory.c     | 119 +++++++++++++++++
 lib/librte_eal/common/include/rte_memory.h    | 122 ++++++++++++++++++
 lib/librte_eal/common/malloc_heap.c           | 104 +++++++++++----
 lib/librte_eal/common/malloc_heap.h           |  15 ++-
 lib/librte_eal/common/rte_malloc.c            | 116 +++++++----------
 lib/librte_eal/rte_eal_version.map            |   4 +
 8 files changed, 447 insertions(+), 103 deletions(-)

-- 
2.17.1