Merge branch 'mlx5-flow-mutate' into rdma.git for-next

For dependencies, branch based on 'mellanox/mlx5-next' of
git://git.kernel.org/pub/scm/linux/kernel/git/mellanox/linux.git

Pull Flow actions to mutate packets from Leon Romanovsky:

====================
This series exposes the ability to create flow actions which can
mutate packet headers. We do that by exposing two new verbs:
 * modify header - can change existing packet headers. packet
 * reformat - can encapsulate or decapsulate a packet.
              Once created a flow action must be attached to a steering
              rule for it to take effect.

The first 10 patches refactor mlx5_core code, rename internal structures
to better reflect their operation and export needed functions so the RDMA
side can allocate the action.

The last 5 patches expose via the IOCTL infrastructure mlx5_ib methods
which do the actual allocation of resources and return an handle to the
user. A user of this API is expected to know how to work with the device's
spec as the input to those function is HW depended.

An example usage of the modify header action is routing, A user can create
an action which edits the L2 header and decrease the TTL.

An example usage of the packet reformat action is VXLAN encap/decap which
is done by the HW.
====================

* branch 'mlx5-flow-mutate':
  RDMA/mlx5: Extend packet reformat verbs
  RDMA/mlx5: Add new flow action verb - packet reformat
  RDMA/uverbs: Add generic function to fill in flow action object
  RDMA/mlx5: Add a new flow action verb - modify header
  RDMA/uverbs: Add UVERBS_ATTR_CONST_IN to the specs language
  net/mlx5: Export packet reformat alloc/dealloc functions
  net/mlx5: Pass a namespace for packet reformat ID allocation
  net/mlx5: Expose new packet reformat capabilities
  {net, RDMA}/mlx5: Rename encap to reformat packet
  net/mlx5: Move header encap type to IFC header file
  net/mlx5: Break encap/decap into two separated flow table creation flags
  net/mlx5: Add support for more namespaces when allocating modify header
  net/mlx5: Export modify header alloc/dealloc functions
  net/mlx5: Add proper NIC TX steering flow tables support
  net/mlx5: Cleanup flow namespace getter switch logic

Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

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