pds_core: devlink params for enabling VIF support

Add the devlink parameter switches so the user can enable
the features supported by the VFs.  The only feature supported
at the moment is vDPA.

Example:
    devlink dev param set pci/0000:2b:00.0 \
	    name enable_vnet cmode runtime value true

Signed-off-by: Shannon Nelson <shannon.nelson@amd.com>
Acked-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

4 files changed, 127 insertions, 6 deletions

diff --git a/Documentation/networking/device_drivers/ethernet/amd/pds_core.rst b/Documentation/networking/device_drivers/ethernet/amd/pds_core.rst
index 932ac03a3359..b9f310de862e 100644
--- a/Documentation/networking/device_drivers/ethernet/amd/pds_core.rst
+++ b/Documentation/networking/device_drivers/ethernet/amd/pds_core.rst
@@ -73,6 +73,25 @@ The ``pds_core`` driver reports the following versions
      - fixed
      - The revision of the ASIC for this device
 
+Parameters
+==========
+
+The ``pds_core`` driver implements the following generic
+parameters for controlling the functionality to be made available
+as auxiliary_bus devices.
+
+.. list-table:: Generic parameters implemented
+   :widths: 5 5 8 82
+
+   * - Name
+     - Mode
+     - Type
+     - Description
+   * - ``enable_vnet``
+     - runtime
+     - Boolean
+     - Enables vDPA functionality through an auxiliary_bus device
+
 Firmware Management
 ===================
 
diff --git a/drivers/net/ethernet/amd/pds_core/core.h b/drivers/net/ethernet/amd/pds_core/core.h
index 36099d3ac3dd..9e01a9ee6868 100644
--- a/drivers/net/ethernet/amd/pds_core/core.h
+++ b/drivers/net/ethernet/amd/pds_core/core.h
@@ -251,6 +251,13 @@ int pdsc_dl_info_get(struct devlink *dl, struct devlink_info_req *req,
 int pdsc_dl_flash_update(struct devlink *dl,
 			 struct devlink_flash_update_params *params,
 			 struct netlink_ext_ack *extack);
+int pdsc_dl_enable_get(struct devlink *dl, u32 id,
+		       struct devlink_param_gset_ctx *ctx);
+int pdsc_dl_enable_set(struct devlink *dl, u32 id,
+		       struct devlink_param_gset_ctx *ctx);
+int pdsc_dl_enable_validate(struct devlink *dl, u32 id,
+			    union devlink_param_value val,
+			    struct netlink_ext_ack *extack);
 
 void __iomem *pdsc_map_dbpage(struct pdsc *pdsc, int page_num);
 
diff --git a/drivers/net/ethernet/amd/pds_core/devlink.c b/drivers/net/ethernet/amd/pds_core/devlink.c
index f91d65cc78b5..9c6b3653c1c7 100644
--- a/drivers/net/ethernet/amd/pds_core/devlink.c
+++ b/drivers/net/ethernet/amd/pds_core/devlink.c
@@ -2,6 +2,79 @@
 /* Copyright(c) 2023 Advanced Micro Devices, Inc */
 
 #include "core.h"
+#include <linux/pds/pds_auxbus.h>
+
+static struct
+pdsc_viftype *pdsc_dl_find_viftype_by_id(struct pdsc *pdsc,
+					 enum devlink_param_type dl_id)
+{
+	int vt;
+
+	for (vt = 0; vt < PDS_DEV_TYPE_MAX; vt++) {
+		if (pdsc->viftype_status[vt].dl_id == dl_id)
+			return &pdsc->viftype_status[vt];
+	}
+
+	return NULL;
+}
+
+int pdsc_dl_enable_get(struct devlink *dl, u32 id,
+		       struct devlink_param_gset_ctx *ctx)
+{
+	struct pdsc *pdsc = devlink_priv(dl);
+	struct pdsc_viftype *vt_entry;
+
+	vt_entry = pdsc_dl_find_viftype_by_id(pdsc, id);
+	if (!vt_entry)
+		return -ENOENT;
+
+	ctx->val.vbool = vt_entry->enabled;
+
+	return 0;
+}
+
+int pdsc_dl_enable_set(struct devlink *dl, u32 id,
+		       struct devlink_param_gset_ctx *ctx)
+{
+	struct pdsc *pdsc = devlink_priv(dl);
+	struct pdsc_viftype *vt_entry;
+	int err = 0;
+	int vf_id;
+
+	vt_entry = pdsc_dl_find_viftype_by_id(pdsc, id);
+	if (!vt_entry || !vt_entry->supported)
+		return -EOPNOTSUPP;
+
+	if (vt_entry->enabled == ctx->val.vbool)
+		return 0;
+
+	vt_entry->enabled = ctx->val.vbool;
+	for (vf_id = 0; vf_id < pdsc->num_vfs; vf_id++) {
+		struct pdsc *vf = pdsc->vfs[vf_id].vf;
+
+		err = ctx->val.vbool ? pdsc_auxbus_dev_add(vf, pdsc) :
+				       pdsc_auxbus_dev_del(vf, pdsc);
+	}
+
+	return err;
+}
+
+int pdsc_dl_enable_validate(struct devlink *dl, u32 id,
+			    union devlink_param_value val,
+			    struct netlink_ext_ack *extack)
+{
+	struct pdsc *pdsc = devlink_priv(dl);
+	struct pdsc_viftype *vt_entry;
+
+	vt_entry = pdsc_dl_find_viftype_by_id(pdsc, id);
+	if (!vt_entry || !vt_entry->supported)
+		return -EOPNOTSUPP;
+
+	if (!pdsc->viftype_status[vt_entry->vif_id].supported)
+		return -ENODEV;
+
+	return 0;
+}
 
 int pdsc_dl_flash_update(struct devlink *dl,
 			 struct devlink_flash_update_params *params,
diff --git a/drivers/net/ethernet/amd/pds_core/main.c b/drivers/net/ethernet/amd/pds_core/main.c
index b848f3360fe2..e2d14b1ca471 100644
--- a/drivers/net/ethernet/amd/pds_core/main.c
+++ b/drivers/net/ethernet/amd/pds_core/main.c
@@ -199,6 +199,14 @@ static const struct devlink_health_reporter_ops pdsc_fw_reporter_ops = {
 	.diagnose = pdsc_fw_reporter_diagnose,
 };
 
+static const struct devlink_param pdsc_dl_params[] = {
+	DEVLINK_PARAM_GENERIC(ENABLE_VNET,
+			      BIT(DEVLINK_PARAM_CMODE_RUNTIME),
+			      pdsc_dl_enable_get,
+			      pdsc_dl_enable_set,
+			      pdsc_dl_enable_validate),
+};
+
 #define PDSC_WQ_NAME_LEN 24
 
 static int pdsc_init_pf(struct pdsc *pdsc)
@@ -246,13 +254,19 @@ static int pdsc_init_pf(struct pdsc *pdsc)
 
 	dl = priv_to_devlink(pdsc);
 	devl_lock(dl);
+	err = devl_params_register(dl, pdsc_dl_params,
+				   ARRAY_SIZE(pdsc_dl_params));
+	if (err) {
+		dev_warn(pdsc->dev, "Failed to register devlink params: %pe\n",
+			 ERR_PTR(err));
+		goto err_out_unlock_dl;
+	}
 
 	hr = devl_health_reporter_create(dl, &pdsc_fw_reporter_ops, 0, pdsc);
 	if (IS_ERR(hr)) {
 		dev_warn(pdsc->dev, "Failed to create fw reporter: %pe\n", hr);
 		err = PTR_ERR(hr);
-		devl_unlock(dl);
-		goto err_out_stop;
+		goto err_out_unreg_params;
 	}
 	pdsc->fw_reporter = hr;
 
@@ -264,7 +278,11 @@ static int pdsc_init_pf(struct pdsc *pdsc)
 
 	return 0;
 
-err_out_stop:
+err_out_unreg_params:
+	devl_params_unregister(dl, pdsc_dl_params,
+			       ARRAY_SIZE(pdsc_dl_params));
+err_out_unlock_dl:
+	devl_unlock(dl);
 	pdsc_stop(pdsc);
 err_out_teardown:
 	pdsc_teardown(pdsc, PDSC_TEARDOWN_REMOVING);
@@ -373,9 +391,13 @@ static void pdsc_remove(struct pci_dev *pdev)
 	dl = priv_to_devlink(pdsc);
 	devl_lock(dl);
 	devl_unregister(dl);
-	if (pdsc->fw_reporter) {
-		devl_health_reporter_destroy(pdsc->fw_reporter);
-		pdsc->fw_reporter = NULL;
+	if (!pdev->is_virtfn) {
+		if (pdsc->fw_reporter) {
+			devl_health_reporter_destroy(pdsc->fw_reporter);
+			pdsc->fw_reporter = NULL;
+		}
+		devl_params_unregister(dl, pdsc_dl_params,
+				       ARRAY_SIZE(pdsc_dl_params));
 	}
 	devl_unlock(dl);