[PATCH net-next 02/14] devlink: Add 'total_vfs' generic device param

Saeed Mahameed
2025-02-28T02:13:26Z

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>
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 4e01dc32bc08..f266da05ab0d 100644
--- a/Documentation/networking/devlink/devlink-params.rst
+++ b/Documentation/networking/devlink/devlink-params.rst
@@ -137,3 +137,6 @@ own name.
* - ``event_eq_size``
- u32
- Control the size of asynchronous control events EQ.
+ * - ``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 b8783126c1ed..eed1e4507d17 100644
--- a/include/net/devlink.h
+++ b/include/net/devlink.h
@@ -520,6 +520,7 @@ enum devlink_param_generic_id {
DEVLINK_PARAM_GENERIC_ID_ENABLE_IWARP,
DEVLINK_PARAM_GENERIC_ID_IO_EQ_SIZE,
DEVLINK_PARAM_GENERIC_ID_EVENT_EQ_SIZE,
+ DEVLINK_PARAM_GENERIC_ID_TOTAL_VFS,

/* add new param generic ids above here*/
__DEVLINK_PARAM_GENERIC_ID_MAX,
@@ -578,6 +579,9 @@ enum devlink_param_generic_id {
#define DEVLINK_PARAM_GENERIC_EVENT_EQ_SIZE_NAME "event_eq_size"
#define DEVLINK_PARAM_GENERIC_EVENT_EQ_SIZE_TYPE DEVLINK_PARAM_TYPE_U32

+#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 e19d978dffa6..d163afbadab9 100644
--- a/net/devlink/param.c
+++ b/net/devlink/param.c
@@ -92,6 +92,11 @@ static const struct devlink_param devlink_param_generic[] = {
.name = DEVLINK_PARAM_GENERIC_EVENT_EQ_SIZE_NAME,
.type = DEVLINK_PARAM_GENERIC_EVENT_EQ_SIZE_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)
--
2.48.1