[PATCH net-next 05/14] net/mlx5: Implement devlink total_vfs parameter

Saeed Mahameed
2025-02-28T02:13:29Z

From: Vlad Dumitrescu <vdumitrescu@nvidia.com>

Some devices support both symmetric (same value for all PFs) and
asymmetric, while others only support symmetric configuration. This
implementation prefers asymmetric, since it is closer to the devlink
model (per function settings), but falls back to symmetric when needed.

Example usage:
devlink dev param set pci/0000:01:00.0 name total_vfs value <u16> cmode permanent
devlink dev reload pci/0000:01:00.0 action fw_activate
echo 1 >/sys/bus/pci/devices/0000:01:00.0/remove
echo 1 >/sys/bus/pci/rescan
cat /sys/bus/pci/devices/0000:01:00.0/sriov_totalvfs

Signed-off-by: Vlad Dumitrescu <vdumitrescu@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
---
Documentation/networking/devlink/mlx5.rst | 22 +++
.../mellanox/mlx5/core/lib/nv_param.c | 125 ++++++++++++++++++
2 files changed, 147 insertions(+)

diff --git a/Documentation/networking/devlink/mlx5.rst b/Documentation/networking/devlink/mlx5.rst
index 587e0200c1cd..00a43324dec2 100644
--- a/Documentation/networking/devlink/mlx5.rst
+++ b/Documentation/networking/devlink/mlx5.rst
@@ -40,6 +40,28 @@ Parameters
- Boolean
- Applies to each physical function (PF) independently, if the device
supports it. Otherwise, it applies symmetrically to all PFs.
+ * - ``total_vfs``
+ - permanent
+ - The range is between 1 and a device-specific max.
+ - Applies to each physical function (PF) independently, if the device
+ supports it. Otherwise, it applies symmetrically to all PFs.
+
+Note: permanent parameters such as ``enable_sriov`` and ``total_vfs`` require FW reset to take effect
+
+.. code-block:: bash
+
+ # setup parameters
+ devlink dev param set pci/0000:01:00.0 name enable_sriov value true cmode permanent
+ devlink dev param set pci/0000:01:00.0 name total_vfs value 8 cmode permanent
+
+ # Fw reset
+ devlink dev reload pci/0000:01:00.0 action fw_activate
+
+ # for PCI related config such as sriov PCI reset/rescan is required:
+ echo 1 >/sys/bus/pci/devices/0000:01:00.0/remove
+ echo 1 >/sys/bus/pci/rescan
+ grep ^ /sys/bus/pci/devices/0000:01:00.0/sriov_*
+

The ``mlx5`` driver also implements the following driver-specific
parameters.
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/nv_param.c b/drivers/net/ethernet/mellanox/mlx5/core/lib/nv_param.c
index 6b63fc110e2d..97d74d890582 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/lib/nv_param.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/nv_param.c
@@ -387,10 +387,135 @@ static int mlx5_devlink_enable_sriov_set(struct devlink *devlink, u32 id,
return mlx5_nv_param_write(dev, mnvda, sizeof(mnvda));
}

+static int mlx5_devlink_total_vfs_get(struct devlink *devlink, u32 id,
+ struct devlink_param_gset_ctx *ctx)
+{
+ struct mlx5_core_dev *dev = devlink_priv(devlink);
+ u32 mnvda[MLX5_ST_SZ_DW(mnvda_reg)] = {};
+ void *data;
+ int err;
+
+ data = MLX5_ADDR_OF(mnvda_reg, mnvda, configuration_item_data);
+
+ err = mlx5_nv_param_read_global_pci_cap(dev, mnvda, sizeof(mnvda));
+ if (err)
+ return err;
+
+ if (!MLX5_GET(nv_global_pci_cap, data, sriov_support)) {
+ ctx->val.vu32 = 0;
+ return 0;
+ }
+
+ memset(mnvda, 0, sizeof(mnvda));
+ err = mlx5_nv_param_read_global_pci_conf(dev, mnvda, sizeof(mnvda));
+ if (err)
+ return err;
+
+ if (!MLX5_GET(nv_global_pci_conf, data, per_pf_total_vf)) {
+ ctx->val.vu32 = MLX5_GET(nv_global_pci_conf, data, total_vfs);
+ return 0;
+ }
+
+ /* SRIOV is per PF */
+ memset(mnvda, 0, sizeof(mnvda));
+ err = mlx5_nv_param_read_per_host_pf_conf(dev, mnvda, sizeof(mnvda));
+ if (err)
+ return err;
+
+ ctx->val.vu32 = MLX5_GET(nv_pf_pci_conf, data, total_vf);
+
+ return 0;
+}
+
+static int mlx5_devlink_total_vfs_set(struct devlink *devlink, u32 id,
+ struct devlink_param_gset_ctx *ctx,
+ struct netlink_ext_ack *extack)
+{
+ struct mlx5_core_dev *dev = devlink_priv(devlink);
+ u32 mnvda[MLX5_ST_SZ_DW(mnvda_reg)];
+ bool per_pf_support;
+ void *data;
+ int err;
+
+ err = mlx5_nv_param_read_global_pci_cap(dev, mnvda, sizeof(mnvda));
+ if (err) {
+ NL_SET_ERR_MSG_MOD(extack, "Failed to read global pci cap");
+ return err;
+ }
+
+ data = MLX5_ADDR_OF(mnvda_reg, mnvda, configuration_item_data);
+ if (!MLX5_GET(nv_global_pci_cap, data, sriov_support)) {
+ NL_SET_ERR_MSG_MOD(extack, "Not configurable on this device");
+ return -EOPNOTSUPP;
+ }
+
+ per_pf_support = MLX5_GET(nv_global_pci_cap, data, per_pf_total_vf_supported);
+ memset(mnvda, 0, sizeof(mnvda));
+
+ err = mlx5_nv_param_read_global_pci_conf(dev, mnvda, sizeof(mnvda));
+ if (err)
+ return err;
+
+ MLX5_SET(nv_global_pci_conf, data, sriov_valid, 1);
+ MLX5_SET(nv_global_pci_conf, data, per_pf_total_vf, per_pf_support);
+
+ if (!per_pf_support) {
+ MLX5_SET(nv_global_pci_conf, data, total_vfs, ctx->val.vu32);
+ return mlx5_nv_param_write(dev, mnvda, sizeof(mnvda));
+ }
+
+ /* SRIOV is per PF */
+ err = mlx5_nv_param_write(dev, mnvda, sizeof(mnvda));
+ if (err)
+ return err;
+
+ memset(mnvda, 0, sizeof(mnvda));
+ err = mlx5_nv_param_read_per_host_pf_conf(dev, mnvda, sizeof(mnvda));
+ if (err)
+ return err;
+
+ data = MLX5_ADDR_OF(mnvda_reg, mnvda, configuration_item_data);
+ MLX5_SET(nv_pf_pci_conf, data, pf_total_vf_en, 1);
+ MLX5_SET(nv_pf_pci_conf, data, total_vf, ctx->val.vu32);
+ return mlx5_nv_param_write(dev, mnvda, sizeof(mnvda));
+}
+
+static int mlx5_devlink_total_vfs_validate(struct devlink *devlink, u32 id,
+ union devlink_param_value val,
+ struct netlink_ext_ack *extack)
+{
+ struct mlx5_core_dev *dev = devlink_priv(devlink);
+ u32 cap[MLX5_ST_SZ_DW(mnvda_reg)];
+ void *data;
+ u16 max;
+ int err;
+
+ data = MLX5_ADDR_OF(mnvda_reg, cap, configuration_item_data);
+
+ err = mlx5_nv_param_read_global_pci_cap(dev, cap, sizeof(cap));
+ if (err)
+ return err;
+
+ if (!MLX5_GET(nv_global_pci_cap, data, max_vfs_per_pf_valid))
+ return 0; /* optimistic, but set might fail later */
+
+ max = MLX5_GET(nv_global_pci_cap, data, max_vfs_per_pf);
+ if (val.vu16 > max) {
+ NL_SET_ERR_MSG_FMT_MOD(extack,
+ "Max allowed by device is %u", max);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
static const struct devlink_param mlx5_nv_param_devlink_params[] = {
DEVLINK_PARAM_GENERIC(ENABLE_SRIOV, BIT(DEVLINK_PARAM_CMODE_PERMANENT),
mlx5_devlink_enable_sriov_get,
mlx5_devlink_enable_sriov_set, NULL),
+ DEVLINK_PARAM_GENERIC(TOTAL_VFS, BIT(DEVLINK_PARAM_CMODE_PERMANENT),
+ mlx5_devlink_total_vfs_get, mlx5_devlink_total_vfs_set,
+ mlx5_devlink_total_vfs_validate),
DEVLINK_PARAM_DRIVER(MLX5_DEVLINK_PARAM_ID_CQE_COMPRESSION_TYPE,
"cqe_compress_type", DEVLINK_PARAM_TYPE_STRING,
BIT(DEVLINK_PARAM_CMODE_PERMANENT),
--
2.48.1