[dpdk-dev] [PATCH v3 0/3] generic channel for multi-process communication

[Jianfeng Tan]

v2->v3:
  - Add pre-check for each APIs.
  - Remove the limitation of 8 secondary processes by: discard original
    register/unregister mechanism of secondary process, instead, primary
    discoveries secondary processes by looking up the folder for regex match.
  - Previous implementation use two sockets for msg and request, this version
    just uses one socket. And receive all kinds of messages in mp thread.

v1->v2: (Address comments from Anatoly and Konstantin)
  - Use datagram unix socket to supersede stream unix socket + epoll.
  - Change the secondary add/del mechanism as now we use connection-less channel.
  - Add mp_mutex_action to sync action register/unregister/reference.
  - Limit max length of action name to 64B.
  - New APIs for synchronous communication: rte_eal_mp_request/rte_eal_mp_reply.
  - Formalize the errno handle.
  - Some other small issues.

This patchset adds a generic channel for multi-process (primary/secondary)
communication.

Patch 1: addess the purpose and howto;
Patch 2: add a syncrhonous way for the requests which need a immediate response.
Patch 3: Rework vfio to use this generic communication channel.


Jianfeng Tan (3):
  eal: add channel for multi-process communication
  eal: add synchronous multi-process communication
  vfio: use the generic multi-process channel

 doc/guides/rel_notes/release_18_02.rst         |  15 +
 lib/librte_eal/common/eal_common_proc.c        | 593 ++++++++++++++++++++++++-
 lib/librte_eal/common/eal_filesystem.h         |  17 +
 lib/librte_eal/common/eal_private.h            |  10 +
 lib/librte_eal/common/include/rte_eal.h        | 131 ++++++
 lib/librte_eal/linuxapp/eal/eal.c              |  22 +-
 lib/librte_eal/linuxapp/eal/eal_vfio.c         | 172 +++----
 lib/librte_eal/linuxapp/eal/eal_vfio.h         |  15 +-
 lib/librte_eal/linuxapp/eal/eal_vfio_mp_sync.c | 408 +++--------------
 lib/librte_eal/rte_eal_version.map             |   6 +
 10 files changed, 915 insertions(+), 474 deletions(-)

-- 
2.7.4