net/mlx5: Separate mlx5 driver documentation into multiple pages

The mlx5 device driver documentation page has grown in size and should be
split into multiple subpages. This change also contains a table of contents
for these new subpages.
Signed-off-by: NRahul Rameshbabu <rrameshbabu@nvidia.com>
Reviewed-by: NGal Pressman <gal@nvidia.com>
Reviewed-by: NTariq Toukan <tariqt@nvidia.com>
Signed-off-by: NSaeed Mahameed <saeedm@nvidia.com>

Documentation/networking/device_drivers/ethernet/index.rst

@@ -39,7 +39,7 @@ Contents:
    intel/ice
    marvell/octeontx2
    marvell/octeon_ep
-   mellanox/mlx5
+   mellanox/mlx5/index
    microsoft/netvsc
    neterion/s2io
    netronome/nfp

Documentation/networking/device_drivers/ethernet/mellanox/mlx5/devlink.rst

+.. SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
+.. include:: <isonum.txt>
+
+=======
+Devlink
+=======
+
+:Copyright: |copy| 2023, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+
+Contents
+========
+
+- `Info`_
+- `Parameters`_
+- `Health reporters`_
+
+Info
+====
+
+The devlink info reports the running and stored firmware versions on device.
+It also prints the device PSID which represents the HCA board type ID.
+
+User command example::
+
+   $ devlink dev info pci/0000:00:06.0
+      pci/0000:00:06.0:
+      driver mlx5_core
+      versions:
+         fixed:
+            fw.psid MT_0000000009
+         running:
+            fw.version 16.26.0100
+         stored:
+            fw.version 16.26.0100
+
+Parameters
+==========
+
+flow_steering_mode: Device flow steering mode
+---------------------------------------------
+The flow steering mode parameter controls the flow steering mode of the driver.
+Two modes are supported:
+1. 'dmfs' - Device managed flow steering.
+2. 'smfs' - Software/Driver managed flow steering.
+
+In DMFS mode, the HW steering entities are created and managed through the
+Firmware.
+In SMFS mode, the HW steering entities are created and managed though by
+the driver directly into hardware without firmware intervention.
+
+SMFS mode is faster and provides better rule insertion rate compared to default DMFS mode.
+
+User command examples:
+
+- Set SMFS flow steering mode::
+
+    $ devlink dev param set pci/0000:06:00.0 name flow_steering_mode value "smfs" cmode runtime
+
+- Read device flow steering mode::
+
+    $ devlink dev param show pci/0000:06:00.0 name flow_steering_mode
+      pci/0000:06:00.0:
+      name flow_steering_mode type driver-specific
+      values:
+         cmode runtime value smfs
+
+enable_roce: RoCE enablement state
+----------------------------------
+RoCE enablement state controls driver support for RoCE traffic.
+When RoCE is disabled, there is no gid table, only raw ethernet QPs are supported and traffic on the well-known UDP RoCE port is handled as raw ethernet traffic.
+
+To change RoCE enablement state, a user must change the driverinit cmode value and run devlink reload.
+
+User command examples:
+
+- Disable RoCE::
+
+    $ devlink dev param set pci/0000:06:00.0 name enable_roce value false cmode driverinit
+    $ devlink dev reload pci/0000:06:00.0
+
+- Read RoCE enablement state::
+
+    $ devlink dev param show pci/0000:06:00.0 name enable_roce
+      pci/0000:06:00.0:
+      name enable_roce type generic
+      values:
+         cmode driverinit value true
+
+esw_port_metadata: Eswitch port metadata state
+----------------------------------------------
+When applicable, disabling eswitch metadata can increase packet rate
+up to 20% depending on the use case and packet sizes.
+
+Eswitch port metadata state controls whether to internally tag packets with
+metadata. Metadata tagging must be enabled for multi-port RoCE, failover
+between representors and stacked devices.
+By default metadata is enabled on the supported devices in E-switch.
+Metadata is applicable only for E-switch in switchdev mode and
+users may disable it when NONE of the below use cases will be in use:
+1. HCA is in Dual/multi-port RoCE mode.
+2. VF/SF representor bonding (Usually used for Live migration)
+3. Stacked devices
+
+When metadata is disabled, the above use cases will fail to initialize if
+users try to enable them.
+
+- Show eswitch port metadata::
+
+    $ devlink dev param show pci/0000:06:00.0 name esw_port_metadata
+      pci/0000:06:00.0:
+        name esw_port_metadata type driver-specific
+          values:
+            cmode runtime value true
+
+- Disable eswitch port metadata::
+
+    $ devlink dev param set pci/0000:06:00.0 name esw_port_metadata value false cmode runtime
+
+- Change eswitch mode to switchdev mode where after choosing the metadata value::
+
+    $ devlink dev eswitch set pci/0000:06:00.0 mode switchdev
+
+Health reporters
+================
+
+tx reporter
+-----------
+The tx reporter is responsible for reporting and recovering of the following two error scenarios:
+
+- tx timeout
+    Report on kernel tx timeout detection.
+    Recover by searching lost interrupts.
+- tx error completion
+    Report on error tx completion.
+    Recover by flushing the tx queue and reset it.
+
+tx reporter also support on demand diagnose callback, on which it provides
+real time information of its send queues status.
+
+User commands examples:
+
+- Diagnose send queues status::
+
+    $ devlink health diagnose pci/0000:82:00.0 reporter tx
+
+NOTE: This command has valid output only when interface is up, otherwise the command has empty output.
+
+- Show number of tx errors indicated, number of recover flows ended successfully,
+  is autorecover enabled and graceful period from last recover::
+
+    $ devlink health show pci/0000:82:00.0 reporter tx
+
+rx reporter
+-----------
+The rx reporter is responsible for reporting and recovering of the following two error scenarios:
+
+- rx queues' initialization (population) timeout
+    Population of rx queues' descriptors on ring initialization is done
+    in napi context via triggering an irq. In case of a failure to get
+    the minimum amount of descriptors, a timeout would occur, and
+    descriptors could be recovered by polling the EQ (Event Queue).
+- rx completions with errors (reported by HW on interrupt context)
+    Report on rx completion error.
+    Recover (if needed) by flushing the related queue and reset it.
+
+rx reporter also supports on demand diagnose callback, on which it
+provides real time information of its receive queues' status.
+
+- Diagnose rx queues' status and corresponding completion queue::
+
+    $ devlink health diagnose pci/0000:82:00.0 reporter rx
+
+NOTE: This command has valid output only when interface is up. Otherwise, the command has empty output.
+
+- Show number of rx errors indicated, number of recover flows ended successfully,
+  is autorecover enabled, and graceful period from last recover::
+
+    $ devlink health show pci/0000:82:00.0 reporter rx
+
+fw reporter
+-----------
+The fw reporter implements `diagnose` and `dump` callbacks.
+It follows symptoms of fw error such as fw syndrome by triggering
+fw core dump and storing it into the dump buffer.
+The fw reporter diagnose command can be triggered any time by the user to check
+current fw status.
+
+User commands examples:
+
+- Check fw heath status::
+
+    $ devlink health diagnose pci/0000:82:00.0 reporter fw
+
+- Read FW core dump if already stored or trigger new one::
+
+    $ devlink health dump show pci/0000:82:00.0 reporter fw
+
+NOTE: This command can run only on the PF which has fw tracer ownership,
+running it on other PF or any VF will return "Operation not permitted".
+
+fw fatal reporter
+-----------------
+The fw fatal reporter implements `dump` and `recover` callbacks.
+It follows fatal errors indications by CR-space dump and recover flow.
+The CR-space dump uses vsc interface which is valid even if the FW command
+interface is not functional, which is the case in most FW fatal errors.
+The recover function runs recover flow which reloads the driver and triggers fw
+reset if needed.
+On firmware error, the health buffer is dumped into the dmesg. The log
+level is derived from the error's severity (given in health buffer).
+
+User commands examples:
+
+- Run fw recover flow manually::
+
+    $ devlink health recover pci/0000:82:00.0 reporter fw_fatal
+
+- Read FW CR-space dump if already stored or trigger new one::
+
+    $ devlink health dump show pci/0000:82:00.1 reporter fw_fatal
+
+NOTE: This command can run only on PF.

Documentation/networking/device_drivers/ethernet/mellanox/mlx5/index.rst

+.. SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
+.. include:: <isonum.txt>
+
+Mellanox ConnectX(R) mlx5 core VPI Network Driver
+=================================================
+
+:Copyright: |copy| 2019, Mellanox Technologies LTD.
+:Copyright: |copy| 2020-2023, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+
+Contents:
+
+.. toctree::
+   :maxdepth: 2
+
+   kconfig
+   devlink
+   switchdev
+   tracepoints
+
+.. only::  subproject and html
+
+   Indices
+   =======
+
+   * :ref:`genindex`

Documentation/networking/device_drivers/ethernet/mellanox/mlx5/kconfig.rst

+.. SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
+.. include:: <isonum.txt>
+
+=======================================
+Enabling the driver and kconfig options
+=======================================
+
+:Copyright: |copy| 2023, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+
+| mlx5 core is modular and most of the major mlx5 core driver features can be selected (compiled in/out)
+| at build time via kernel Kconfig flags.
+| Basic features, ethernet net device rx/tx offloads and XDP, are available with the most basic flags
+| CONFIG_MLX5_CORE=y/m and CONFIG_MLX5_CORE_EN=y.
+| For the list of advanced features, please see below.
+
+**CONFIG_MLX5_CORE=(y/m/n)** (module mlx5_core.ko)
+
+|    The driver can be enabled by choosing CONFIG_MLX5_CORE=y/m in kernel config.
+|    This will provide mlx5 core driver for mlx5 ulps to interface with (mlx5e, mlx5_ib).
+
+
+**CONFIG_MLX5_CORE_EN=(y/n)**
+
+|    Choosing this option will allow basic ethernet netdevice support with all of the standard rx/tx offloads.
+|    mlx5e is the mlx5 ulp driver which provides netdevice kernel interface, when chosen, mlx5e will be
+|    built-in into mlx5_core.ko.
+
+
+**CONFIG_MLX5_EN_ARFS=(y/n)**
+
+|     Enables Hardware-accelerated receive flow steering (arfs) support, and ntuple filtering.
+|     https://community.mellanox.com/s/article/howto-configure-arfs-on-connectx-4
+
+
+**CONFIG_MLX5_EN_RXNFC=(y/n)**
+
+|    Enables ethtool receive network flow classification, which allows user defined
+|    flow rules to direct traffic into arbitrary rx queue via ethtool set/get_rxnfc API.
+
+
+**CONFIG_MLX5_CORE_EN_DCB=(y/n)**:
+
+|    Enables `Data Center Bridging (DCB) Support <https://community.mellanox.com/s/article/howto-auto-config-pfc-and-ets-on-connectx-4-via-lldp-dcbx>`_.
+
+
+**CONFIG_MLX5_MPFS=(y/n)**
+
+|    Ethernet Multi-Physical Function Switch (MPFS) support in ConnectX NIC.
+|    MPFs is required for when `Multi-Host <http://www.mellanox.com/page/multihost>`_ configuration is enabled to allow passing
+|    user configured unicast MAC addresses to the requesting PF.
+
+
+**CONFIG_MLX5_ESWITCH=(y/n)**
+
+|    Ethernet SRIOV E-Switch support in ConnectX NIC. E-Switch provides internal SRIOV packet steering
+|    and switching for the enabled VFs and PF in two available modes:
+|           1) `Legacy SRIOV mode (L2 mac vlan steering based) <https://community.mellanox.com/s/article/howto-configure-sr-iov-for-connectx-4-connectx-5-with-kvm--ethernet-x>`_.
+|           2) `Switchdev mode (eswitch offloads) <https://www.mellanox.com/related-docs/prod_software/ASAP2_Hardware_Offloading_for_vSwitches_User_Manual_v4.4.pdf>`_.
+
+
+**CONFIG_MLX5_CORE_IPOIB=(y/n)**
+
+|    IPoIB offloads & acceleration support.
+|    Requires CONFIG_MLX5_CORE_EN to provide an accelerated interface for the rdma
+|    IPoIB ulp netdevice.
+
+
+**CONFIG_MLX5_FPGA=(y/n)**
+
+|    Build support for the Innova family of network cards by Mellanox Technologies.
+|    Innova network cards are comprised of a ConnectX chip and an FPGA chip on one board.
+|    If you select this option, the mlx5_core driver will include the Innova FPGA core and allow
+|    building sandbox-specific client drivers.
+
+
+**CONFIG_MLX5_EN_IPSEC=(y/n)**
+
+|    Enables `IPSec XFRM cryptography-offload acceleration <http://www.mellanox.com/related-docs/prod_software/Mellanox_Innova_IPsec_Ethernet_Adapter_Card_User_Manual.pdf>`_.
+
+**CONFIG_MLX5_EN_TLS=(y/n)**
+
+|   TLS cryptography-offload acceleration.
+
+
+**CONFIG_MLX5_INFINIBAND=(y/n/m)** (module mlx5_ib.ko)
+
+|   Provides low-level InfiniBand/RDMA and `RoCE <https://community.mellanox.com/s/article/recommended-network-configuration-examples-for-roce-deployment>`_ support.
+
+**CONFIG_MLX5_SF=(y/n)**
+
+|   Build support for subfunction.
+|   Subfunctons are more light weight than PCI SRIOV VFs. Choosing this option
+|   will enable support for creating subfunction devices.
+
+**External options** ( Choose if the corresponding mlx5 feature is required )
+
+- CONFIG_PTP_1588_CLOCK: When chosen, mlx5 ptp support will be enabled
+- CONFIG_VXLAN: When chosen, mlx5 vxlan support will be enabled.
+- CONFIG_MLXFW: When chosen, mlx5 firmware flashing support will be enabled (via devlink and ethtool).

Documentation/networking/device_drivers/ethernet/mellanox/mlx5/tracepoints.rst

+.. SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
+.. include:: <isonum.txt>
+
+===========
+Tracepoints
+===========
+
+:Copyright: |copy| 2023, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+
+mlx5 driver provides internal tracepoints for tracking and debugging using
+kernel tracepoints interfaces (refer to Documentation/trace/ftrace.rst).
+
+For the list of support mlx5 events, check `/sys/kernel/debug/tracing/events/mlx5/`.
+
+tc and eswitch offloads tracepoints:
+
+- mlx5e_configure_flower: trace flower filter actions and cookies offloaded to mlx5::
+
+    $ echo mlx5:mlx5e_configure_flower >> /sys/kernel/debug/tracing/set_event
+    $ cat /sys/kernel/debug/tracing/trace
+    ...
+    tc-6535  [019] ...1  2672.404466: mlx5e_configure_flower: cookie=0000000067874a55 actions= REDIRECT
+
+- mlx5e_delete_flower: trace flower filter actions and cookies deleted from mlx5::
+
+    $ echo mlx5:mlx5e_delete_flower >> /sys/kernel/debug/tracing/set_event
+    $ cat /sys/kernel/debug/tracing/trace
+    ...
+    tc-6569  [010] .N.1  2686.379075: mlx5e_delete_flower: cookie=0000000067874a55 actions= NULL
+
+- mlx5e_stats_flower: trace flower stats request::
+
+    $ echo mlx5:mlx5e_stats_flower >> /sys/kernel/debug/tracing/set_event
+    $ cat /sys/kernel/debug/tracing/trace
+    ...
+    tc-6546  [010] ...1  2679.704889: mlx5e_stats_flower: cookie=0000000060eb3d6a bytes=0 packets=0 lastused=4295560217
+
+- mlx5e_tc_update_neigh_used_value: trace tunnel rule neigh update value offloaded to mlx5::
+
+    $ echo mlx5:mlx5e_tc_update_neigh_used_value >> /sys/kernel/debug/tracing/set_event
+    $ cat /sys/kernel/debug/tracing/trace
+    ...
+    kworker/u48:4-8806  [009] ...1 55117.882428: mlx5e_tc_update_neigh_used_value: netdev: ens1f0 IPv4: 1.1.1.10 IPv6: ::ffff:1.1.1.10 neigh_used=1
+
+- mlx5e_rep_neigh_update: trace neigh update tasks scheduled due to neigh state change events::
+
+    $ echo mlx5:mlx5e_rep_neigh_update >> /sys/kernel/debug/tracing/set_event
+    $ cat /sys/kernel/debug/tracing/trace
+    ...
+    kworker/u48:7-2221  [009] ...1  1475.387435: mlx5e_rep_neigh_update: netdev: ens1f0 MAC: 24:8a:07:9a:17:9a IPv4: 1.1.1.10 IPv6: ::ffff:1.1.1.10 neigh_connected=1
+
+Bridge offloads tracepoints:
+
+- mlx5_esw_bridge_fdb_entry_init: trace bridge FDB entry offloaded to mlx5::
+
+    $ echo mlx5:mlx5_esw_bridge_fdb_entry_init >> set_event
+    $ cat /sys/kernel/debug/tracing/trace
+    ...
+    kworker/u20:9-2217    [003] ...1   318.582243: mlx5_esw_bridge_fdb_entry_init: net_device=enp8s0f0_0 addr=e4:fd:05:08:00:02 vid=0 flags=0 used=0
+
+- mlx5_esw_bridge_fdb_entry_cleanup: trace bridge FDB entry deleted from mlx5::
+
+    $ echo mlx5:mlx5_esw_bridge_fdb_entry_cleanup >> set_event
+    $ cat /sys/kernel/debug/tracing/trace
+    ...
+    ip-2581    [005] ...1   318.629871: mlx5_esw_bridge_fdb_entry_cleanup: net_device=enp8s0f0_1 addr=e4:fd:05:08:00:03 vid=0 flags=0 used=16
+
+- mlx5_esw_bridge_fdb_entry_refresh: trace bridge FDB entry offload refreshed in
+  mlx5::
+
+    $ echo mlx5:mlx5_esw_bridge_fdb_entry_refresh >> set_event
+    $ cat /sys/kernel/debug/tracing/trace
+    ...
+    kworker/u20:8-3849    [003] ...1       466716: mlx5_esw_bridge_fdb_entry_refresh: net_device=enp8s0f0_0 addr=e4:fd:05:08:00:02 vid=3 flags=0 used=0
+
+- mlx5_esw_bridge_vlan_create: trace bridge VLAN object add on mlx5
+  representor::
+
+    $ echo mlx5:mlx5_esw_bridge_vlan_create >> set_event
+    $ cat /sys/kernel/debug/tracing/trace
+    ...
+    ip-2560    [007] ...1   318.460258: mlx5_esw_bridge_vlan_create: vid=1 flags=6
+
+- mlx5_esw_bridge_vlan_cleanup: trace bridge VLAN object delete from mlx5
+  representor::
+
+    $ echo mlx5:mlx5_esw_bridge_vlan_cleanup >> set_event
+    $ cat /sys/kernel/debug/tracing/trace
+    ...
+    bridge-2582    [007] ...1   318.653496: mlx5_esw_bridge_vlan_cleanup: vid=2 flags=8
+
+- mlx5_esw_bridge_vport_init: trace mlx5 vport assigned with bridge upper
+  device::
+
+    $ echo mlx5:mlx5_esw_bridge_vport_init >> set_event
+    $ cat /sys/kernel/debug/tracing/trace
+    ...
+    ip-2560    [007] ...1   318.458915: mlx5_esw_bridge_vport_init: vport_num=1
+
+- mlx5_esw_bridge_vport_cleanup: trace mlx5 vport removed from bridge upper
+  device::
+
+    $ echo mlx5:mlx5_esw_bridge_vport_cleanup >> set_event
+    $ cat /sys/kernel/debug/tracing/trace
+    ...
+    ip-5387    [000] ...1       573713: mlx5_esw_bridge_vport_cleanup: vport_num=1
+
+Eswitch QoS tracepoints:
+
+- mlx5_esw_vport_qos_create: trace creation of transmit scheduler arbiter for vport::
+
+    $ echo mlx5:mlx5_esw_vport_qos_create >> /sys/kernel/debug/tracing/set_event
+    $ cat /sys/kernel/debug/tracing/trace
+    ...
+    <...>-23496   [018] .... 73136.838831: mlx5_esw_vport_qos_create: (0000:82:00.0) vport=2 tsar_ix=4 bw_share=0, max_rate=0 group=000000007b576bb3
+
+- mlx5_esw_vport_qos_config: trace configuration of transmit scheduler arbiter for vport::
+
+    $ echo mlx5:mlx5_esw_vport_qos_config >> /sys/kernel/debug/tracing/set_event
+    $ cat /sys/kernel/debug/tracing/trace
+    ...
+    <...>-26548   [023] .... 75754.223823: mlx5_esw_vport_qos_config: (0000:82:00.0) vport=1 tsar_ix=3 bw_share=34, max_rate=10000 group=000000007b576bb3
+
+- mlx5_esw_vport_qos_destroy: trace deletion of transmit scheduler arbiter for vport::
+
+    $ echo mlx5:mlx5_esw_vport_qos_destroy >> /sys/kernel/debug/tracing/set_event
+    $ cat /sys/kernel/debug/tracing/trace
+    ...
+    <...>-27418   [004] .... 76546.680901: mlx5_esw_vport_qos_destroy: (0000:82:00.0) vport=1 tsar_ix=3
+
+- mlx5_esw_group_qos_create: trace creation of transmit scheduler arbiter for rate group::
+
+    $ echo mlx5:mlx5_esw_group_qos_create >> /sys/kernel/debug/tracing/set_event
+    $ cat /sys/kernel/debug/tracing/trace
+    ...
+    <...>-26578   [008] .... 75776.022112: mlx5_esw_group_qos_create: (0000:82:00.0) group=000000008dac63ea tsar_ix=5
+
+- mlx5_esw_group_qos_config: trace configuration of transmit scheduler arbiter for rate group::
+
+    $ echo mlx5:mlx5_esw_group_qos_config >> /sys/kernel/debug/tracing/set_event
+    $ cat /sys/kernel/debug/tracing/trace
+    ...
+    <...>-27303   [020] .... 76461.455356: mlx5_esw_group_qos_config: (0000:82:00.0) group=000000008dac63ea tsar_ix=5 bw_share=100 max_rate=20000
+
+- mlx5_esw_group_qos_destroy: trace deletion of transmit scheduler arbiter for group::
+
+    $ echo mlx5:mlx5_esw_group_qos_destroy >> /sys/kernel/debug/tracing/set_event
+    $ cat /sys/kernel/debug/tracing/trace
+    ...
+    <...>-27418   [006] .... 76547.187258: mlx5_esw_group_qos_destroy: (0000:82:00.0) group=000000007b576bb3 tsar_ix=1
+
+SF tracepoints:
+
+- mlx5_sf_add: trace addition of the SF port::
+
+    $ echo mlx5:mlx5_sf_add >> /sys/kernel/debug/tracing/set_event
+    $ cat /sys/kernel/debug/tracing/trace
+    ...
+    devlink-9363    [031] ..... 24610.188722: mlx5_sf_add: (0000:06:00.0) port_index=32768 controller=0 hw_id=0x8000 sfnum=88
+
+- mlx5_sf_free: trace freeing of the SF port::
+
+    $ echo mlx5:mlx5_sf_free >> /sys/kernel/debug/tracing/set_event
+    $ cat /sys/kernel/debug/tracing/trace
+    ...
+    devlink-9830    [038] ..... 26300.404749: mlx5_sf_free: (0000:06:00.0) port_index=32768 controller=0 hw_id=0x8000
+
+- mlx5_sf_hwc_alloc: trace allocating of the hardware SF context::
+
+    $ echo mlx5:mlx5_sf_hwc_alloc >> /sys/kernel/debug/tracing/set_event
+    $ cat /sys/kernel/debug/tracing/trace
+    ...
+    devlink-9775    [031] ..... 26296.385259: mlx5_sf_hwc_alloc: (0000:06:00.0) controller=0 hw_id=0x8000 sfnum=88
+
+- mlx5_sf_hwc_free: trace freeing of the hardware SF context::
+
+    $ echo mlx5:mlx5_sf_hwc_free >> /sys/kernel/debug/tracing/set_event
+    $ cat /sys/kernel/debug/tracing/trace
+    ...
+    kworker/u128:3-9093    [046] ..... 24625.365771: mlx5_sf_hwc_free: (0000:06:00.0) hw_id=0x8000
+
+- mlx5_sf_hwc_deferred_free : trace deferred freeing of the hardware SF context::
+
+    $ echo mlx5:mlx5_sf_hwc_deferred_free >> /sys/kernel/debug/tracing/set_event
+    $ cat /sys/kernel/debug/tracing/trace
+    ...
+    devlink-9519    [046] ..... 24624.400271: mlx5_sf_hwc_deferred_free: (0000:06:00.0) hw_id=0x8000
+
+- mlx5_sf_vhca_event: trace SF vhca event and state::
+
+    $ echo mlx5:mlx5_sf_vhca_event >> /sys/kernel/debug/tracing/set_event
+    $ cat /sys/kernel/debug/tracing/trace
+    ...
+    kworker/u128:3-9093    [046] ..... 24625.365525: mlx5_sf_vhca_event: (0000:06:00.0) hw_id=0x8000 sfnum=88 vhca_state=1
+
+- mlx5_sf_dev_add : trace SF device add event::
+
+    $ echo mlx5:mlx5_sf_dev_add>> /sys/kernel/debug/tracing/set_event
+    $ cat /sys/kernel/debug/tracing/trace
+    ...
+    kworker/u128:3-9093    [000] ..... 24616.524495: mlx5_sf_dev_add: (0000:06:00.0) sfdev=00000000fc5d96fd aux_id=4 hw_id=0x8000 sfnum=88
+
+- mlx5_sf_dev_del : trace SF device delete event::
+
+    $ echo mlx5:mlx5_sf_dev_del >> /sys/kernel/debug/tracing/set_event
+    $ cat /sys/kernel/debug/tracing/trace
+    ...
+    kworker/u128:3-9093    [044] ..... 24624.400749: mlx5_sf_dev_del: (0000:06:00.0) sfdev=00000000fc5d96fd aux_id=4 hw_id=0x8000 sfnum=88