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devlink: Add 'total_vfs' generic device param

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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>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20250907012953.301746-2-saeed@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Vlad Dumitrescu
2025-09-09 19:14:23 -07:00
committed by Jakub Kicinski
parent b90c7ca4f9
commit ce0b015e26
3 changed files with 14 additions and 0 deletions
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Documentation/networking/devlink/devlink-params.rst
+5
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@@ -143,3 +143,8 @@ own name.
* - ``clock_id``
- u64
- Clock ID used by the device for registering DPLL devices and pins.
* - ``total_vfs``
- u32
- The max number of Virtual Functions (VFs) exposed by the PF.
after reboot/pci reset, 'sriov_totalvfs' entry under the device's sysfs
directory will report this value.
include/net/devlink.h
+4
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@@ -530,6 +530,7 @@ enum devlink_param_generic_id {
DEVLINK_PARAM_GENERIC_ID_EVENT_EQ_SIZE,
DEVLINK_PARAM_GENERIC_ID_ENABLE_PHC,
DEVLINK_PARAM_GENERIC_ID_CLOCK_ID,
DEVLINK_PARAM_GENERIC_ID_TOTAL_VFS,
/* add new param generic ids above here*/
__DEVLINK_PARAM_GENERIC_ID_MAX,
@@ -594,6 +595,9 @@ enum devlink_param_generic_id {
#define DEVLINK_PARAM_GENERIC_CLOCK_ID_NAME "clock_id"
#define DEVLINK_PARAM_GENERIC_CLOCK_ID_TYPE DEVLINK_PARAM_TYPE_U64
#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, \
net/devlink/param.c
+5
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@@ -102,6 +102,11 @@ static const struct devlink_param devlink_param_generic[] = {
.name = DEVLINK_PARAM_GENERIC_CLOCK_ID_NAME,
.type = DEVLINK_PARAM_GENERIC_CLOCK_ID_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)