Add DC transport support to mlx5

Changelog:
v1 -> v2:
* Renamed functions to better describe functionality.
* Improve set_mlx5_qp function implementation.
v0 -> v1:
* Updated "net/mlx5: Add DCT command interface" patch to declare variables in reversed Christmas tree order.

---------------------------------------a

Following the discussion [1] on the mailing list regarding "Custom/proprietary QP type support", the following patchset implements the direct connected QP types functionality over posted RFC.

The dynamically connected (DC) transport service provides a datagram-like model that allows a DC QP to target multiple remote processes in multiple remote nodes.

As far as reachability is concerned, the DC model is somewhat similar to the unreliable datagram (UD) model in the sense that each WR submitted to the DC SQ carries the information that identifies the remote destination.

The new QP type - IB_QPT_DRIVER is introduced to represent all type of QPs that are driver specific, like the proposed DC QP. Such minimal change to the IB/core allows reuse of existing verbs functions to control those new QPs with already existing functions.

[1] https://www.spinics.net/lists/linux-rdma/msg57598.html

The patches are available in the git repository at:
git.kernel.org/pub/scm/linux/kernel/git/leon/linux-rdma.git tags/rdma-next-2018-01-02-1

Thanks
---------------------------------------

Moni Shoua (6):
net/mlx5: Add DCT command interface net/mlx5: Enable DC transport
IB/core: Introduce driver QP type
IB/mlx5: Handle type IB_QPT_DRIVER when creating a QP IB/mlx5: Add support for DC Initiator QP IB/mlx5: Add support for DC target QP

 drivers/infiniband/hw/mlx5/main.c              |  27 +-
 drivers/infiniband/hw/mlx5/mlx5_ib.h           |  12 +
 drivers/infiniband/hw/mlx5/qp.c                | 364 ++++++++++++++++++++++++-
 drivers/net/ethernet/mellanox/mlx5/core/eq.c   |   9 +-
 drivers/net/ethernet/mellanox/mlx5/core/main.c |   3 +
 drivers/net/ethernet/mellanox/mlx5/core/qp.c   | 125 ++++++++-
 include/linux/mlx5/device.h                    |   9 +
 include/linux/mlx5/driver.h                    |   8 +
 include/linux/mlx5/qp.h                        |  12 +
 include/rdma/ib_verbs.h                        |   1 +
 include/uapi/rdma/mlx5-abi.h                   |  12 +-
 11 files changed, 560 insertions(+), 22 deletions(-)

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2.15.1

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