Currently a function (VF/SF) is always untrusted by default. Such a
function does not have the privilege to perform steering database update
as what a switchdev device can do.

In a use case where, a trusted application wants to modify/update the
device steering database through a VF or a SF, add a user knob through
which administrator can mark the function trusted; thereby it can update
the steering database.

This patchset introduces a knob to mark a function trusted. Function
restores to its untrusted state when either user marks it as untrusted
or the function is deleted (SR-IOV disablement or SF port deletion).

Patch Summary:
patch1: extends devlink to get/set trust state
patch2: extends mlx5 driver to get/set trust state setting

example config sequence:
Add SF Port:
$ devlink port add pci/0000:08:00.0 flavour pcisf pfnum 0 sfnum 88
pci/0000:08:00.0/32768: type eth netdev eth6 flavour pcisf controller 0 pfnum 0 sfnum 88 splittable false
  function:
    hw_addr 00:00:00:00:00:00 state inactive opstate detached trusted false

Set SF trust setting:
$ devlink port function set pci/0000:08:00.0/32768 trusted true

Query SF settings:
$ devlink port show pci/0000:08:00.0/32768
pci/0000:08:00.0/32768: type eth netdev eth6 flavour pcisf controller 0 pfnum 0 sfnum 88 splittable false
  function:
    hw_addr 00:00:00:00:00:00 state inactive opstate detached trusted true

Sunil Rani (2):
  devlink: Add support to set port function as trusted
  net/mlx5: SF/VF, Port function trust set support

 .../networking/devlink/devlink-port.rst       |   4 +
 .../net/ethernet/mellanox/mlx5/core/devlink.c |   2 +
 .../net/ethernet/mellanox/mlx5/core/eswitch.c |  24 ++++
 .../net/ethernet/mellanox/mlx5/core/eswitch.h |  11 +-
 .../mellanox/mlx5/core/eswitch_offloads.c     | 116 ++++++++++++++++++
 include/linux/mlx5/driver.h                   |   1 +
 include/linux/mlx5/mlx5_ifc.h                 |  10 +-
 include/net/devlink.h                         |  22 ++++
 include/uapi/linux/devlink.h                  |   1 +
 net/core/devlink.c                            |  55 +++++++++
 10 files changed, 244 insertions(+), 2 deletions(-)

-- 
2.26.2