1 files changed, 53 insertions, 0 deletions
diff --git a/drivers/net/ethernet/microchip/sparx5/sparx5_pgid.c b/drivers/net/ethernet/microchip/sparx5/sparx5_pgid.c
new file mode 100644
index 000000000000..eae819fa9486
--- /dev/null
+++ b/drivers/net/ethernet/microchip/sparx5/sparx5_pgid.c
@@ -0,0 +1,53 @@
+// SPDX-License-Identifier: GPL-2.0+
+#include "sparx5_main.h"
+
+void sparx5_pgid_init(struct sparx5 *spx5)
+{
+	int i;
+
+	for (i = 0; i < spx5->data->consts->n_pgids; i++)
+		spx5->pgid_map[i] = SPX5_PGID_FREE;
+
+	/* Reserved for unicast, flood control, broadcast, and CPU.
+	 * These cannot be freed.
+	 */
+	for (i = 0; i <= sparx5_get_pgid(spx5, PGID_CPU); i++)
+		spx5->pgid_map[i] = SPX5_PGID_RESERVED;
+}
+
+int sparx5_pgid_alloc_mcast(struct sparx5 *spx5, u16 *idx)
+{
+	int i;
+
+	/* The multicast area starts at index 65, but the first 7
+	 * are reserved for flood masks and CPU. Start alloc after that.
+	 */
+	for (i = sparx5_get_pgid(spx5, PGID_MCAST_START);
+	     i < spx5->data->consts->n_pgids; i++) {
+		if (spx5->pgid_map[i] == SPX5_PGID_FREE) {
+			spx5->pgid_map[i] = SPX5_PGID_MULTICAST;
+			*idx = i;
+			return 0;
+		}
+	}
+
+	return -EBUSY;
+}
+
+int sparx5_pgid_free(struct sparx5 *spx5, u16 idx)
+{
+	if (idx <= sparx5_get_pgid(spx5, PGID_CPU) ||
+	    idx >= spx5->data->consts->n_pgids)
+		return -EINVAL;
+
+	if (spx5->pgid_map[idx] == SPX5_PGID_FREE)
+		return -EINVAL;
+
+	spx5->pgid_map[idx] = SPX5_PGID_FREE;
+	return 0;
+}
+
+int sparx5_get_pgid(struct sparx5 *sparx5, int pgid)
+{
+	return sparx5->data->consts->n_ports + pgid;
+}