pds_core: set up the VIF definitions and defaults

The Virtual Interfaces (VIFs) supported by the DSC's
configuration (vDPA, Eth, RDMA, etc) are reported in the
dev_ident struct and made visible in debugfs.  At this point
only vDPA is supported in this driver so we only setup
devices for that feature.
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>

drivers/net/ethernet/amd/pds_core/core.c

@@ -346,6 +346,43 @@ static int pdsc_core_init(struct pdsc *pdsc)
 	return err;
 }
 
+static struct pdsc_viftype pdsc_viftype_defaults[] = {
+	[PDS_DEV_TYPE_VDPA] = { .name = PDS_DEV_TYPE_VDPA_STR,
+				.vif_id = PDS_DEV_TYPE_VDPA,
+				.dl_id = DEVLINK_PARAM_GENERIC_ID_ENABLE_VNET },
+	[PDS_DEV_TYPE_MAX] = {}
+};
+
+static int pdsc_viftypes_init(struct pdsc *pdsc)
+{
+	enum pds_core_vif_types vt;
+
+	pdsc->viftype_status = kzalloc(sizeof(pdsc_viftype_defaults),
+				       GFP_KERNEL);
+	if (!pdsc->viftype_status)
+		return -ENOMEM;
+
+	for (vt = 0; vt < PDS_DEV_TYPE_MAX; vt++) {
+		bool vt_support;
+
+		if (!pdsc_viftype_defaults[vt].name)
+			continue;
+
+		/* Grab the defaults */
+		pdsc->viftype_status[vt] = pdsc_viftype_defaults[vt];
+
+		/* See what the Core device has for support */
+		vt_support = !!le16_to_cpu(pdsc->dev_ident.vif_types[vt]);
+		dev_dbg(pdsc->dev, "VIF %s is %ssupported\n",
+			pdsc->viftype_status[vt].name,
+			vt_support ? "" : "not ");
+
+		pdsc->viftype_status[vt].supported = vt_support;
+	}
+
+	return 0;
+}
+
 int pdsc_setup(struct pdsc *pdsc, bool init)
 {
 	int numdescs;
@@ -388,6 +425,14 @@ int pdsc_setup(struct pdsc *pdsc, bool init)
 	if (err)
 		goto err_out_teardown;
 
+	/* Set up the VIFs */
+	err = pdsc_viftypes_init(pdsc);
+	if (err)
+		goto err_out_teardown;
+
+	if (init)
+		pdsc_debugfs_add_viftype(pdsc);
+
 	clear_bit(PDSC_S_FW_DEAD, &pdsc->state);
 	return 0;
 
@@ -404,6 +449,9 @@ void pdsc_teardown(struct pdsc *pdsc, bool removing)
 	pdsc_qcq_free(pdsc, &pdsc->notifyqcq);
 	pdsc_qcq_free(pdsc, &pdsc->adminqcq);
 
+	kfree(pdsc->viftype_status);
+	pdsc->viftype_status = NULL;
+
 	if (pdsc->intr_info) {
 		for (i = 0; i < pdsc->nintrs; i++)
 			pdsc_intr_free(pdsc, i);

drivers/net/ethernet/amd/pds_core/core.h

@@ -123,6 +123,15 @@ struct pdsc_qcq {
 	struct dentry *dentry;
 };
 
+struct pdsc_viftype {
+	char *name;
+	bool supported;
+	bool enabled;
+	int dl_id;
+	int vif_id;
+	struct pds_auxiliary_dev *padev;
+};
+
 /* No state flags set means we are in a steady running state */
 enum pdsc_state_flags {
 	PDSC_S_FW_DEAD,		    /* stopped, wait on startup or recovery */
@@ -174,6 +183,7 @@ struct pdsc {
 	struct pdsc_qcq adminqcq;
 	struct pdsc_qcq notifyqcq;
 	u64 last_eid;
+	struct pdsc_viftype *viftype_status;
 };
 
 /** enum pds_core_dbell_bits - bitwise composition of dbell values.
@@ -237,6 +247,7 @@ void pdsc_debugfs_destroy(void);
 void pdsc_debugfs_add_dev(struct pdsc *pdsc);
 void pdsc_debugfs_del_dev(struct pdsc *pdsc);
 void pdsc_debugfs_add_ident(struct pdsc *pdsc);
+void pdsc_debugfs_add_viftype(struct pdsc *pdsc);
 void pdsc_debugfs_add_irqs(struct pdsc *pdsc);
 void pdsc_debugfs_add_qcq(struct pdsc *pdsc, struct pdsc_qcq *qcq);
 void pdsc_debugfs_del_qcq(struct pdsc_qcq *qcq);

drivers/net/ethernet/amd/pds_core/debugfs.c

@@ -68,6 +68,30 @@ void pdsc_debugfs_add_ident(struct pdsc *pdsc)
 			    pdsc, &identity_fops);
 }
 
+static int viftype_show(struct seq_file *seq, void *v)
+{
+	struct pdsc *pdsc = seq->private;
+	int vt;
+
+	for (vt = 0; vt < PDS_DEV_TYPE_MAX; vt++) {
+		if (!pdsc->viftype_status[vt].name)
+			continue;
+
+		seq_printf(seq, "%s\t%d supported %d enabled\n",
+			   pdsc->viftype_status[vt].name,
+			   pdsc->viftype_status[vt].supported,
+			   pdsc->viftype_status[vt].enabled);
+	}
+	return 0;
+}
+DEFINE_SHOW_ATTRIBUTE(viftype);
+
+void pdsc_debugfs_add_viftype(struct pdsc *pdsc)
+{
+	debugfs_create_file("viftypes", 0400, pdsc->dentry,
+			    pdsc, &viftype_fops);
+}
+
 static const struct debugfs_reg32 intr_ctrl_regs[] = {
 	{ .name = "coal_init", .offset = 0, },
 	{ .name = "mask", .offset = 4, },

include/linux/pds/pds_common.h

@@ -20,6 +20,25 @@ enum pds_core_driver_type {
 	PDS_DRIVER_ESXI    = 6,
 };
 
+enum pds_core_vif_types {
+	PDS_DEV_TYPE_CORE	= 0,
+	PDS_DEV_TYPE_VDPA	= 1,
+	PDS_DEV_TYPE_VFIO	= 2,
+	PDS_DEV_TYPE_ETH	= 3,
+	PDS_DEV_TYPE_RDMA	= 4,
+	PDS_DEV_TYPE_LM		= 5,
+
+	/* new ones added before this line */
+	PDS_DEV_TYPE_MAX	= 16   /* don't change - used in struct size */
+};
+
+#define PDS_DEV_TYPE_CORE_STR	"Core"
+#define PDS_DEV_TYPE_VDPA_STR	"vDPA"
+#define PDS_DEV_TYPE_VFIO_STR	"VFio"
+#define PDS_DEV_TYPE_ETH_STR	"Eth"
+#define PDS_DEV_TYPE_RDMA_STR	"RDMA"
+#define PDS_DEV_TYPE_LM_STR	"LM"
+
 #define PDS_CORE_IFNAMSIZ		16
 
 /**