[PATCH net-next V6 01/13] devlink: Add 'total_vfs' generic device param

[Saeed Mahameed <saeed@kernel.org>]

From: Vlad Dumitrescu <vdumitrescu@nvidia.com>

NICs are typically configured with total_vfs=0, forcing users to rely
on external tools to enable SR-IOV (a widely used and essential feature).

Add total_vfs parameter to devlink for SR-IOV max VF configurability.
Enables standard kernel tools to manage SR-IOV, addressing the need for
flexible VF configuration.

Signed-off-by: Vlad Dumitrescu <vdumitrescu@nvidia.com>
Tested-by: Kamal Heib <kheib@redhat.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
---
 Documentation/networking/devlink/devlink-params.rst | 3 +++
 include/net/devlink.h                               | 4 ++++
 net/devlink/param.c                                 | 5 +++++
 3 files changed, 12 insertions(+)

diff --git a/Documentation/networking/devlink/devlink-params.rst b/Documentation/networking/devlink/devlink-params.rst
index 3da8f4ef2417..f2920371622c 100644
--- a/Documentation/networking/devlink/devlink-params.rst
+++ b/Documentation/networking/devlink/devlink-params.rst
@@ -140,3 +140,6 @@ own name.
    * - ``enable_phc``
      - Boolean
      - Enable PHC (PTP Hardware Clock) functionality in the device.
+   * - ``total_vfs``
+     - u32
+     - The total number of Virtual Functions (VFs) supported by the PF.
diff --git a/include/net/devlink.h b/include/net/devlink.h
index d0ce5a7e984c..32508b4d5df3 100644
--- a/include/net/devlink.h
+++ b/include/net/devlink.h
@@ -523,6 +523,7 @@ enum devlink_param_generic_id {
 	DEVLINK_PARAM_GENERIC_ID_IO_EQ_SIZE,
 	DEVLINK_PARAM_GENERIC_ID_EVENT_EQ_SIZE,
 	DEVLINK_PARAM_GENERIC_ID_ENABLE_PHC,
+	DEVLINK_PARAM_GENERIC_ID_TOTAL_VFS,
 
 	/* add new param generic ids above here*/
 	__DEVLINK_PARAM_GENERIC_ID_MAX,
@@ -584,6 +585,9 @@ enum devlink_param_generic_id {
 #define DEVLINK_PARAM_GENERIC_ENABLE_PHC_NAME "enable_phc"
 #define DEVLINK_PARAM_GENERIC_ENABLE_PHC_TYPE DEVLINK_PARAM_TYPE_BOOL
 
+#define DEVLINK_PARAM_GENERIC_TOTAL_VFS_NAME "total_vfs"
+#define DEVLINK_PARAM_GENERIC_TOTAL_VFS_TYPE DEVLINK_PARAM_TYPE_U32
+
 #define DEVLINK_PARAM_GENERIC(_id, _cmodes, _get, _set, _validate)	\
 {									\
 	.id = DEVLINK_PARAM_GENERIC_ID_##_id,				\
diff --git a/net/devlink/param.c b/net/devlink/param.c
index 396b8a7f6013..3a5fe0a639ea 100644
--- a/net/devlink/param.c
+++ b/net/devlink/param.c
@@ -97,6 +97,11 @@ static const struct devlink_param devlink_param_generic[] = {
 		.name = DEVLINK_PARAM_GENERIC_ENABLE_PHC_NAME,
 		.type = DEVLINK_PARAM_GENERIC_ENABLE_PHC_TYPE,
 	},
+	{
+		.id = DEVLINK_PARAM_GENERIC_ID_TOTAL_VFS,
+		.name = DEVLINK_PARAM_GENERIC_TOTAL_VFS_NAME,
+		.type = DEVLINK_PARAM_GENERIC_TOTAL_VFS_TYPE,
+	},
 };
 
 static int devlink_param_generic_verify(const struct devlink_param *param)
-- 
2.50.0