1 files changed, 81 insertions, 0 deletions
diff --git a/drivers/net/ethernet/microchip/sparx5/sparx5_pool.c b/drivers/net/ethernet/microchip/sparx5/sparx5_pool.c
new file mode 100644
index 000000000000..b4b280c6138b
--- /dev/null
+++ b/drivers/net/ethernet/microchip/sparx5/sparx5_pool.c
@@ -0,0 +1,81 @@
+// SPDX-License-Identifier: GPL-2.0+
+/* Microchip Sparx5 Switch driver
+ *
+ * Copyright (c) 2023 Microchip Technology Inc. and its subsidiaries.
+ */
+
+#include "sparx5_main_regs.h"
+#include "sparx5_main.h"
+
+static u32 sparx5_pool_id_to_idx(u32 id)
+{
+	return --id;
+}
+
+u32 sparx5_pool_idx_to_id(u32 idx)
+{
+	return ++idx;
+}
+
+/* Release resource from pool.
+ * Return reference count on success, otherwise return error.
+ */
+int sparx5_pool_put(struct sparx5_pool_entry *pool, int size, u32 id)
+{
+	struct sparx5_pool_entry *e_itr;
+
+	e_itr = (pool + sparx5_pool_id_to_idx(id));
+	if (e_itr->ref_cnt == 0)
+		return -EINVAL;
+
+	return --e_itr->ref_cnt;
+}
+
+/* Get resource from pool.
+ * Return reference count on success, otherwise return error.
+ */
+int sparx5_pool_get(struct sparx5_pool_entry *pool, int size, u32 *id)
+{
+	struct sparx5_pool_entry *e_itr;
+	int i;
+
+	for (i = 0, e_itr = pool; i < size; i++, e_itr++) {
+		if (e_itr->ref_cnt == 0) {
+			*id = sparx5_pool_idx_to_id(i);
+			return ++e_itr->ref_cnt;
+		}
+	}
+
+	return -ENOSPC;
+}
+
+/* Get resource from pool that matches index.
+ * Return reference count on success, otherwise return error.
+ */
+int sparx5_pool_get_with_idx(struct sparx5_pool_entry *pool, int size, u32 idx,
+			     u32 *id)
+{
+	struct sparx5_pool_entry *e_itr;
+	int i, ret = -ENOSPC;
+
+	for (i = 0, e_itr = pool; i < size; i++, e_itr++) {
+		/* Pool index of first free entry */
+		if (e_itr->ref_cnt == 0 && ret == -ENOSPC)
+			ret = i;
+		/* Tc index already in use ? */
+		if (e_itr->idx == idx && e_itr->ref_cnt > 0) {
+			ret = i;
+			break;
+		}
+	}
+
+	/* Did we find a free entry? */
+	if (ret >= 0) {
+		*id = sparx5_pool_idx_to_id(ret);
+		e_itr = (pool + ret);
+		e_itr->idx = idx;
+		return ++e_itr->ref_cnt;
+	}
+
+	return ret;
+}