[dpdk-dev] [PATCH v6 0/2] generic channel for multi-process communication

[Jianfeng Tan]

v5->v6:
  - Correct the API name issue in rte_eal_version.map.

v3->v5:
  - Drop the patch 3 on vfio communication (postponed).
  - Change names from rte_eal_mp_* -> rte_mp_* as suggested by Thomas.
  - Add nb_sent and nb_received in struct rte_mp_reply.
  - Standardize the return val of sendmsg, request, reply: 0 on sucess,
    (-1) on failure.
  - If we found an peer error when we send msg in primary, we try to
    remove the secondary socket; as there is no sync mechanism there
    (cannot do flock like regular file for socket file), we use a more
    complex socket name (with tsc in it).
  - Some other small changes.

v3->v4:
  - Wrong patches are sent out.

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.



Jianfeng Tan (2):
  eal: add channel for multi-process communication
  eal: add synchronous multi-process communication

 doc/guides/rel_notes/release_18_02.rst  |  11 +
 lib/librte_eal/bsdapp/eal/eal.c         |  10 +-
 lib/librte_eal/common/eal_common_proc.c | 655 +++++++++++++++++++++++++++++++-
 lib/librte_eal/common/eal_filesystem.h  |  19 +-
 lib/librte_eal/common/eal_private.h     |  12 +-
 lib/librte_eal/common/include/rte_eal.h | 133 ++++++-
 lib/librte_eal/linuxapp/eal/eal.c       |  10 +-
 lib/librte_eal/rte_eal_version.map      |   5 +
 8 files changed, 848 insertions(+), 7 deletions(-)

-- 
2.7.4