netdev - [PATCH RFC v4 net-next 10/13] pds_core: devlink params for enabling VIF support

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Date:   Tue, 7 Mar 2023 21:13:07 -0800
From:   Shannon Nelson <shannon.nelson@....com>
To:     <shannon.nelson@....com>, <brett.creeley@....com>,
        <davem@...emloft.net>, <netdev@...r.kernel.org>, <kuba@...nel.org>
CC:     <drivers@...sando.io>, <leon@...nel.org>, <jiri@...nulli.us>
Subject: [PATCH RFC v4 net-next 10/13] pds_core: devlink params for enabling VIF support

Add the devlink parameter switches so the user can enable
the features supported by the VFs.

Signed-off-by: Shannon Nelson <shannon.nelson@....com>
---
 drivers/net/ethernet/amd/pds_core/devlink.c | 88 +++++++++++++++++++++
 1 file changed, 88 insertions(+)

diff --git a/drivers/net/ethernet/amd/pds_core/devlink.c b/drivers/net/ethernet/amd/pds_core/devlink.c
index 7f2016807e5e..693702403018 100644
--- a/drivers/net/ethernet/amd/pds_core/devlink.c
+++ b/drivers/net/ethernet/amd/pds_core/devlink.c
@@ -7,6 +7,86 @@
 #include <linux/pci.h>
 
 #include <linux/pds/pds_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;
+}
+
+static 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;
+}
+
+static 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(vf, pdsc) :
+				       pdsc_auxbus_dev_del_vf(vf, pdsc);
+	}
+
+	return err;
+}
+
+static 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;
+}
+
+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),
+};
 
 static int pdsc_dl_flash_update(struct devlink *dl,
 				struct devlink_flash_update_params *params,
@@ -100,6 +180,14 @@ void pdsc_dl_free(struct pdsc *pdsc)
 int pdsc_dl_register(struct pdsc *pdsc)
 {
 	struct devlink *dl = priv_to_devlink(pdsc);
+	int err;
+
+	if (!pdsc->pdev->is_virtfn) {
+		err = devlink_params_register(dl, pdsc_dl_params,
+					      ARRAY_SIZE(pdsc_dl_params));
+		if (err)
+			return err;
+	}
 
 	devlink_register(dl);
 
-- 
2.17.1