net/mlx5: Expose ICM consumption per function

ICM is a portion of the host's memory assigned to a function by the OS
through requests made by the NIC's firmware.

PF ICM consumption can be accessed directly, while VF/SF ICM consumption
can be accessed through their representors in switchdev mode.

The value is exposed to the user in granularity of 4KB through the vnic
health reporter as follows:

$ devlink health diagnose pci/0000:08:00.0 reporter vnic
 vNIC env counters:
     total_error_queues: 0 send_queue_priority_update_flow: 0
     comp_eq_overrun: 0 async_eq_overrun: 0 cq_overrun: 0
     invalid_command: 0 quota_exceeded_command: 0
     nic_receive_steering_discard: 0 icm_consumption: 1032

Signed-off-by: Akiva Goldberger <agoldberger@nvidia.com>
Reviewed-by: Moshe Shemesh <moshe@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://patch.msgid.link/20250209101716.112774-11-tariqt@nvidia.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>