Refactor ib_uverbs_write path

Hi,

This series comes as an outcome of [1] which was sent to rdma-rc and it should be applied on top of that patch.

During review process of that patch, we realized that the ib_uverbs_write() has number of flaws and this series
tries to fix them:
1. Localize all processing and verification code in specific functions.
2. Fix the command mask insufficient checks.
3. Simplify code to allow drop uverbs_ex_mask and in the future we will drop uverbs_mask too.
4. Fix differences in error codes.

Thanks

[1] https://marc.info/?l=linux-rdma&m=151851719021404&w=2

Leon Romanovsky (14):
RDMA/uverbs: Convert command mask validity check function to be bool RDMA/uverbs: Update sizeof users
RDMA/uverbs: Refactor flags checks and update return value RDMA/uverbs: Fail as early as possible if not enough header data was
provided
RDMA/uverbs: Return not supported error code for unsupported commands RDMA/uverbs: Unify return values of not supported command RDMA/uverbs: Refactor command header processing RDMA/uverbs: Properly check command supported mask RDMA/uverbs: Move uncontext check before SRCU read lock RDMa/uverbs: Copy ex_hdr outside of SRCU read lock RDMA/uverbs: Refactor the header validation logic RDMA/verbs: Return proper error code for not supported system call RDMA/verbs: Check existence of function prior to accessing it RDMA/verbs: Drop uverbs_ex_mask

 drivers/infiniband/core/core_priv.h   |   3 +
 drivers/infiniband/core/uverbs_cmd.c  |  21 ++++
 drivers/infiniband/core/uverbs_main.c | 219 ++++++++++++++++------------------
 drivers/infiniband/core/verbs.c       |  46 +++----
 drivers/infiniband/hw/mlx4/main.c     |  18 ---
 drivers/infiniband/hw/mlx5/main.c     |  15 ---
 include/rdma/ib_verbs.h               |   1 -
 7 files changed, 150 insertions(+), 173 deletions(-)

--
2.16.1

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