isisd: add isis flex-algo base interface

Adds basic functionality to Flex-Algo for IS-IS wrapping lib/flex_algo.
The configuration interface will be added in the next commit.

Signed-off-by: Hiroki Shirokura <hiroki.shirokura@linecorp.com>
Signed-off-by: Eric Kinzie <ekinzie@labn.net>
Signed-off-by: Louis Scalbert <louis.scalbert@6wind.com>

1 files changed, 51 insertions, 0 deletions

diff --git a/isisd/isis_flex_algo.h b/isisd/isis_flex_algo.h
new file mode 100644
index 0000000000..0a0e337e01
--- /dev/null
+++ b/isisd/isis_flex_algo.h
@@ -0,0 +1,51 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*********************************************************************
+ * Copyright 2022 Hiroki Shirokura, LINE Corporation
+ * Copyright 2022 Masakazu Asama
+ * Copyright 2022 6WIND S.A.
+ *
+ * isis_flex_algo.h: IS-IS Flexible Algorithm
+ *
+ * Authors
+ * -------
+ * Hiroki Shirokura
+ * Masakazu Asama
+ * Louis Scalbert
+ */
+
+#ifndef ISIS_FLEX_ALGO_H
+#define ISIS_FLEX_ALGO_H
+
+#include "flex_algo.h"
+#include "isisd/isis_constants.h"
+
+#ifndef FABRICD
+
+struct isis_flex_algo_data {
+	struct isis_spftree *spftree[SPFTREE_COUNT][ISIS_LEVELS];
+	struct isis_area *area;
+};
+
+struct isis_flex_algo_alloc_arg {
+	uint8_t algorithm;
+	struct isis_area *area;
+};
+
+void *isis_flex_algo_data_alloc(void *arg);
+void isis_flex_algo_data_free(void *data);
+
+struct isis_router_cap_fad *
+isis_flex_algo_elected(int algorithm, const struct isis_area *area);
+bool isis_flex_algo_supported(struct flex_algo *fad);
+struct isis_router_cap_fad *
+isis_flex_algo_elected_supported(int algorithm, const struct isis_area *area);
+struct isis_router_cap_fad *
+isis_flex_algo_elected_supported_local_fad(int algorithm,
+					   const struct isis_area *area,
+					   struct isis_router_cap_fad **fad);
+struct isis_lsp;
+bool sr_algorithm_participated(const struct isis_lsp *lsp, uint8_t algorithm);
+
+#endif /* ifndef FABRICD */
+
+#endif /* ISIS_FLEX_ALGO_H */