uverbs extensions fixes

This series is a continuous improvement for the uverbs extension mechanism and flow steering uverbs that were introduced as an experimental features for v3.12.

I suggested and implemented the following improvements:
- improved extensible/extended command infrastructure with clear split between core/ (eg. uverbs) and hw/ (eg. provider) portion of command and response;
- structure renaming to match others uverbs public structs;
- changes usage of the flow_attr.size to not count the "extended command header" but to describe only the size of the flow specs following flow_attr;
- removed unneeded flow_spec structure that don't need to be exposed to userspace.
- ensure 64bits alignment

Changes from v1 (patchset [1]):

- re-enable patch by Matan Barack as the last step
- patch moving comp_mask in command header dropped following discussion about having comp_mask for provider data and response.
- moved variable written_count in an inner block

Changes from v0 (patchset [2]):

- Re-enable flow steering verbs and the extension verbs mechanism.
- Squashed patches 1 and 2 from the original series
- ib_uverbs_write should return the number of bytes including the header's size (Patch 7).

Changes from v(-1) (patchset [3] and patchset [4]):

- merge infrastructure and uverbs flow fixes
- rebased against Matan Barack fixes
- removed changes on function name

Changes from initial (patchset [5]):

- move "comp_mask" in the command header
- add a response header
- add strict command length check

[1] [PATCH for-next V1 0/8] uverbs extensions fixes

    http://marc.info/?i=1383126771-7658-1-git-send-email-matanb-VPRAkNaXOzVWk0Htik3J/[email protected]

[2] [PATCH 0/9] IB/core: batch of fix against create/destroy_flow uverbs for v3.12

    http://marc.info/?i=cover.1381510045.git.ydroneaud-RlY5vtjFyJ3QT0dZR+AlfA@public.gmane.org

[3] [PATCH 00/10] IB/core: more fixes for create_flow uverbs (for v3.12)

    http://marc.info/?i=cover.1381351016.git.ydroneaud-RlY5vtjFyJ3QT0dZR+AlfA@public.gmane.org

[4] [PATCH v2 0/4] IB/core: an improved infrastructure for uverbs commands

    http://marc.info/?i=cover.1381177342.git.ydroneaud-RlY5vtjFyJ3QT0dZR+AlfA@public.gmane.org

[5] [PATCH] An improved infrastructure for uverbs commands (My take at designing extensible scheme)

    http://marc.info/?i=1380039392-15480-1-git-send-email-ydroneaud-RlY5vtjFyJ3QT0dZR+AlfA@public.gmane.org

Matan Barak (2):
IB/core: clarify overflow/underflow checks on ib_create/destroy_flow IB/core: re-enable create_flow/destroy_flow uverbs

Yann Droneaud (5):
IB/core: Rename 'flow' structs to match other uverbs structs IB/core: Makes uverbs flow structure using names more similar to verbs
ones
IB/core: Uses a common header for uverbs flow_specs IB/core: Remove ib_uverbs_flow_spec structure from userspace IB/core: extended command: an improved infrastructure for uverbs
commands

 drivers/infiniband/Kconfig            |  11 ---
 drivers/infiniband/core/uverbs.h      |  36 ++++++++--
 drivers/infiniband/core/uverbs_cmd.c  |  96 ++++++++++++-------------
 drivers/infiniband/core/uverbs_main.c | 128 +++++++++++++++++++++++++---------
 drivers/infiniband/hw/mlx4/main.c     |   8 +--
 include/rdma/ib_verbs.h               |   1 +
 include/uapi/rdma/ib_user_verbs.h     |  95 ++++++++++++++-----------
 7 files changed, 228 insertions(+), 147 deletions(-)

1.8.3.1

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