1 files changed, 46 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 000000000..af8b43500
--- /dev/null
+++ b/drivers/net/ethernet/microchip/sparx5/sparx5_pgid.c
@@ -0,0 +1,46 @@
+// SPDX-License-Identifier: GPL-2.0+
+#include "sparx5_main.h"
+
+void sparx5_pgid_init(struct sparx5 *spx5)
+{
+	int i;
+
+	for (i = 0; i < PGID_TABLE_SIZE; i++)
+		spx5->pgid_map[i] = SPX5_PGID_FREE;
+
+	/* Reserved for unicast, flood control, broadcast, and CPU.
+	 * These cannot be freed.
+	 */
+	for (i = 0; i <= 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 = PGID_MCAST_START; i < PGID_TABLE_SIZE; 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 <= PGID_CPU || idx >= PGID_TABLE_SIZE)
+		return -EINVAL;
+
+	if (spx5->pgid_map[idx] == SPX5_PGID_FREE)
+		return -EINVAL;
+
+	spx5->pgid_map[idx] = SPX5_PGID_FREE;
+	return 0;
+}