Flow actions to mutate packets

From: Leon Romanovsky <[email protected]>

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.

Changelog:
v0 -> v1:
* Patch 1: Addressed Saeed's comments and simplified the logic.
* Patch 2: Changed due to changes in patch 1.

Split the 27 patch series into 3, this is the first one which just lets the user create flow action. Other than that styling fixes mainly in the RDMA patches to make sure 80 chars limit isn't exceeded.

RFC -> v0:
* Patch 1 a new patch which refactors the logic
when getting a flow namespace.
* Patch 2 was split into two.
* Patch 3: Fixed a typo in commit message
* Patch 5: Updated commit message
* Patch 7: Updated commit message
Renamed:
- MLX5_FLOW_CONTEXT_ACTION_PACKET_REFORMAT_ID to MLX5_FLOW_CONTEXT_ACTION_PACKET_REFORMAT
- packet_reformat_id to reformat_id in struct mlx5_flow_act
- packet_reformat_id to encap_id in struct mlx5_esw_flow_attr
- packet_reformat_id to encap_id in struct mlx5e_encap_entry
- PACKET_REFORMAT to REFORMAT when printing trace points
* Patch 9: Updated commit message
Updated function declaration in mlx5_core.h, could of lead to compile error on bisection.
* Patch 11: Disallow egress rules insertion when in switchdev mode
* Patch 12: A new patch to deal with passing enum values using the IOCTL infrastructure.
* Patch 13: Use new enum value attribute when passing enum mlx5_ib_uapi_flow_table_type
* Patch 15: Don't set encap flags on flow tables if in switchdev mode
* Patch 17: Use new enum value attribute when passing enum mlx5_ib_uapi_flow_table_type and enum mlx5_ib_uapi_flow_action_packet_reformat_type
* Patch 19: Allow creation of both MLX5_IB_UAPI_FLOW_ACTION_PACKET_REFORMAT_TYPE_L2_TO_L3_TUNNEL and MLX5_IB_UAPI_FLOW_ACTION_PACKET_REFORMAT_TYPE_L3_TUNNEL_TO_L2
packet
reformat actions.
* Patch 20: A new patch which allows attaching packet reformat actions to flow tables on NIC RX.

Thanks

Mark Bloch (15):
net/mlx5: Cleanup flow namespace getter switch logic net/mlx5: Add proper NIC TX steering flow tables support net/mlx5: Export modify header alloc/dealloc functions net/mlx5: Add support for more namespaces when allocating modify
header
net/mlx5: Break encap/decap into two separated flow table creation
flags
net/mlx5: Move header encap type to IFC header file {net, RDMA}/mlx5: Rename encap to reformat packet net/mlx5: Expose new packet reformat capabilities net/mlx5: Pass a namespace for packet reformat ID allocation net/mlx5: Export packet reformat alloc/dealloc functions RDMA/uverbs: Add UVERBS_ATTR_CONST_IN to the specs language RDMA/mlx5: Add a new flow action verb - modify header RDMA/uverbs: Add generic function to fill in flow action object RDMA/mlx5: Add new flow action verb - packet reformat RDMA/mlx5: Extend packet reformat verbs

 drivers/infiniband/core/uverbs_ioctl.c             |  23 ++
 .../infiniband/core/uverbs_std_types_flow_action.c |   7 +-
 drivers/infiniband/hw/mlx5/devx.c                  |   6 +-
 drivers/infiniband/hw/mlx5/flow.c                  | 301 +++++++++++++++++++++
 drivers/infiniband/hw/mlx5/main.c                  |   3 +
 drivers/infiniband/hw/mlx5/mlx5_ib.h               |  19 +-
 drivers/net/ethernet/mellanox/mlx5/core/cmd.c      |   8 +-
 .../mellanox/mlx5/core/diag/fs_tracepoint.h        |   2 +-
 drivers/net/ethernet/mellanox/mlx5/core/en_tc.c    |  51 ++--
 drivers/net/ethernet/mellanox/mlx5/core/eswitch.c  |   2 +-
 .../ethernet/mellanox/mlx5/core/eswitch_offloads.c |   9 +-
 drivers/net/ethernet/mellanox/mlx5/core/fs_cmd.c   |  87 +++---
 drivers/net/ethernet/mellanox/mlx5/core/fs_core.c  |  73 +++--
 .../net/ethernet/mellanox/mlx5/core/mlx5_core.h    |  12 +-
 include/linux/mlx5/device.h                        |   6 +
 include/linux/mlx5/fs.h                            |  20 +-
 include/linux/mlx5/mlx5_ifc.h                      |  70 +++--
 include/rdma/uverbs_ioctl.h                        |  40 +++
 include/rdma/uverbs_std_types.h                    |  12 +
 include/uapi/rdma/mlx5_user_ioctl_cmds.h           |  18 ++
 include/uapi/rdma/mlx5_user_ioctl_verbs.h          |  12 +
 21 files changed, 638 insertions(+), 143 deletions(-)