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+/*
+ * Copyright (c) 2016 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef __FIB_NODE_H__
+#define __FIB_NODE_H__
+
+#include <vnet/fib/fib_types.h>
+
+/**
+ * The types of nodes in a FIB graph
+ */
+typedef enum fib_node_type_t_ {
+ /**
+ * Marker. New types after this one.
+ */
+ FIB_NODE_TYPE_FIRST = 0,
+ /**
+ * See the respective fib_*.h files for descriptions of these objects.
+ */
+ FIB_NODE_TYPE_WALK,
+ FIB_NODE_TYPE_ENTRY,
+ FIB_NODE_TYPE_PATH_LIST,
+ FIB_NODE_TYPE_PATH,
+ FIB_NODE_TYPE_ADJ,
+ FIB_NODE_TYPE_MPLS_ENTRY,
+ FIB_NODE_TYPE_MPLS_TUNNEL,
+ FIB_NODE_TYPE_LISP_GPE_FWD_ENTRY,
+ FIB_NODE_TYPE_LISP_ADJ,
+ FIB_NODE_TYPE_GRE_TUNNEL,
+ FIB_NODE_TYPE_VXLAN_TUNNEL,
+ /**
+ * Marker. New types before this one. leave the test last.
+ */
+ FIB_NODE_TYPE_TEST,
+ FIB_NODE_TYPE_LAST = FIB_NODE_TYPE_TEST,
+} fib_node_type_t;
+
+#define FIB_NODE_TYPE_MAX (FIB_NODE_TYPE_LAST + 1)
+
+#define FIB_NODE_TYPES { \
+ [FIB_NODE_TYPE_ENTRY] = "entry", \
+ [FIB_NODE_TYPE_WALK] = "walk", \
+ [FIB_NODE_TYPE_PATH_LIST] = "path-list", \
+ [FIB_NODE_TYPE_PATH] = "path", \
+ [FIB_NODE_TYPE_MPLS_ENTRY] = "mpls-entry", \
+ [FIB_NODE_TYPE_MPLS_TUNNEL] = "mpls-tunnel", \
+ [FIB_NODE_TYPE_ADJ] = "adj", \
+ [FIB_NODE_TYPE_LISP_GPE_FWD_ENTRY] = "lisp-gpe-fwd-entry", \
+ [FIB_NODE_TYPE_LISP_ADJ] = "lisp-adj", \
+ [FIB_NODE_TYPE_GRE_TUNNEL] = "gre-tunnel", \
+ [FIB_NODE_TYPE_VXLAN_TUNNEL] = "vxlan-tunnel", \
+}
+
+/**
+ * Reasons for backwalking the FIB object graph
+ */
+typedef enum fib_node_back_walk_reason_t_ {
+ /**
+ * Marker. Add new ones after.
+ */
+ FIB_NODE_BW_REASON_FIRST = 0,
+ /**
+ * Walk to re-resolve the child.
+ * Used when the parent is no longer a valid resolution target
+ */
+ FIB_NODE_BW_REASON_RESOLVE = FIB_NODE_BW_REASON_FIRST,
+ /**
+ * Walk to re-evaluate the forwarding contributed by the parent.
+ * Used when a parent's forwarding changes and the child needs to
+ * incorporate this change in its forwarding.
+ */
+ FIB_NODE_BW_REASON_EVALUATE,
+ /**
+ * A resolving interface has come up
+ */
+ FIB_NODE_BW_REASON_INTERFACE_UP,
+ /**
+ * A resolving interface has gone down
+ */
+ FIB_NODE_BW_REASON_INTERFACE_DOWN,
+ /**
+ * A resolving interface has been deleted.
+ */
+ FIB_NODE_BW_REASON_INTERFACE_DELETE,
+ /**
+ * Walk to re-collapse the multipath adjs when the rewrite of
+ * a unipath adjacency changes
+ */
+ FIB_NODE_BW_REASON_ADJ_UPDATE,
+ /**
+ * Walk to update children to inform them the adjacency is now down.
+ */
+ FIB_NODE_BW_REASON_ADJ_DOWN,
+ /**
+ * Marker. Add new before and update
+ */
+ FIB_NODE_BW_REASON_LAST = FIB_NODE_BW_REASON_ADJ_DOWN,
+} fib_node_back_walk_reason_t;
+
+#define FIB_NODE_BW_REASONS { \
+ [FIB_NODE_BW_REASON_RESOLVE] = "resolve", \
+ [FIB_NODE_BW_REASON_EVALUATE] = "evaluate", \
+ [FIB_NODE_BW_REASON_INTERFACE_UP] = "if-up", \
+ [FIB_NODE_BW_REASON_INTERFACE_DOWN] = "if-down", \
+ [FIB_NODE_BW_REASON_INTERFACE_DELETE] = "if-delete", \
+ [FIB_NODE_BW_REASON_ADJ_UPDATE] = "adj-update", \
+ [FIB_NODE_BW_REASON_ADJ_DOWN] = "adj-down", \
+}
+
+#define FOR_EACH_FIB_NODE_BW_REASON(_item) \
+ for (_item = FIB_NODE_BW_REASON_FIRST; \
+ _item <= FIB_NODE_BW_REASON_LAST; \
+ _item++)
+
+/**
+ * Flags enum constructed from the reaons
+ */
+typedef enum fib_node_bw_reason_flag_t_ {
+ FIB_NODE_BW_REASON_FLAG_NONE = 0,
+ FIB_NODE_BW_REASON_FLAG_RESOLVE = (1 << FIB_NODE_BW_REASON_RESOLVE),
+ FIB_NODE_BW_REASON_FLAG_EVALUATE = (1 << FIB_NODE_BW_REASON_EVALUATE),
+ FIB_NODE_BW_REASON_FLAG_INTERFACE_UP = (1 << FIB_NODE_BW_REASON_INTERFACE_UP),
+ FIB_NODE_BW_REASON_FLAG_INTERFACE_DOWN = (1 << FIB_NODE_BW_REASON_INTERFACE_DOWN),
+ FIB_NODE_BW_REASON_FLAG_INTERFACE_DELETE = (1 << FIB_NODE_BW_REASON_INTERFACE_DELETE),
+ FIB_NODE_BW_REASON_FLAG_ADJ_UPDATE = (1 << FIB_NODE_BW_REASON_ADJ_UPDATE),
+ FIB_NODE_BW_REASON_FLAG_ADJ_DOWN = (1 << FIB_NODE_BW_REASON_ADJ_DOWN),
+} __attribute__ ((packed)) fib_node_bw_reason_flag_t;
+
+STATIC_ASSERT(sizeof(fib_node_bw_reason_flag_t) < 2,
+ "BW Reason enum < 2 byte. Consequences for cover_upd_res_t");
+
+/**
+ * Flags on the walk
+ */
+typedef enum fib_node_bw_flags_t_
+{
+ /**
+ * Force the walk to be synchronous
+ */
+ FIB_NODE_BW_FLAG_FORCE_SYNC = (1 << 0),
+} fib_node_bw_flags_t;
+
+/**
+ * Forward eclarations
+ */
+struct fib_node_t_;
+
+/**
+ * A representation of one pointer to another node.
+ * To fully qualify a node, one must know its type and its index so it
+ * can be retrieved from the appropriate pool. Direct pointers to nodes
+ * are forbidden, since all nodes are allocated from pools, which are vectors,
+ * and thus subject to realloc at any time.
+ */
+typedef struct fib_node_ptr_t_ {
+ /**
+ * node type
+ */
+ fib_node_type_t fnp_type;
+ /**
+ * node's index
+ */
+ fib_node_index_t fnp_index;
+} fib_node_ptr_t;
+
+/**
+ * @brief A list of FIB nodes.
+ */
+typedef u32 fib_node_list_t;
+
+/**
+ * Context passed between object during a back walk.
+ */
+typedef struct fib_node_back_walk_ctx_t_ {
+ /**
+ * The reason/trigger for the backwalk
+ */
+ fib_node_bw_reason_flag_t fnbw_reason;
+
+ /**
+ * additional flags for the walk
+ */
+ fib_node_bw_flags_t fnbw_flags;
+
+ /**
+ * the number of levels the walk has already traversed.
+ * this value is maintained by the walk infra, tp limit the depth of
+ * a walk so it does not run indefinately the presence of a loop/cycle
+ * in the graph.
+ */
+ u32 fnbw_depth;
+} fib_node_back_walk_ctx_t;
+
+/**
+ * We consider a depth of 32 to be sufficient to cover all sane
+ * network topologies. Anything more is then an indication that
+ * there is a loop/cycle in the FIB graph.
+ * Note that all object types contribute to 1 to the depth.
+ */
+#define FIB_NODE_GRAPH_MAX_DEPTH ((u32)32)
+
+/**
+ * A callback function for walking a node dependency list
+ */
+typedef int (*fib_node_ptr_walk_t)(fib_node_ptr_t *depend,
+ void *ctx);
+
+/**
+ * A list of dependent nodes.
+ * This is currently implemented as a hash_table of fib_node_ptr_t
+ */
+typedef fib_node_ptr_t fib_node_ptr_list_t;
+
+/**
+ * Return code from a back walk function
+ */
+typedef enum fib_node_back_walk_rc_t_ {
+ FIB_NODE_BACK_WALK_MERGE,
+ FIB_NODE_BACK_WALK_CONTINUE,
+} fib_node_back_walk_rc_t;
+
+/**
+ * Function definition to backwalk a FIB node
+ */
+typedef fib_node_back_walk_rc_t (*fib_node_back_walk_t)(
+ struct fib_node_t_ *node,
+ fib_node_back_walk_ctx_t *ctx);
+
+/**
+ * Function definition to get a FIB node from its index
+ */
+typedef struct fib_node_t_* (*fib_node_get_t)(fib_node_index_t index);
+
+/**
+ * Function definition to inform the FIB node that its last lock has gone.
+ */
+typedef void (*fib_node_last_lock_gone_t)(struct fib_node_t_ *node);
+
+/**
+ * Function definition to display the amount of memory used by a type.
+ * Implementations should call fib_show_memory_usage()
+ */
+typedef void (*fib_node_memory_show_t)(void);
+
+/**
+ * A FIB graph nodes virtual function table
+ */
+typedef struct fib_node_vft_t_ {
+ fib_node_get_t fnv_get;
+ fib_node_last_lock_gone_t fnv_last_lock;
+ fib_node_back_walk_t fnv_back_walk;
+ format_function_t *fnv_format;
+ fib_node_memory_show_t fnv_mem_show;
+} fib_node_vft_t;
+
+/**
+ * An node in the FIB graph
+ *
+ * Objects in the FIB form a graph.
+ */
+typedef struct fib_node_t_ {
+#if CLIB_DEBUG > 0
+ /**
+ * The node's type. make sure we are dynamic/down casting correctly
+ */
+ fib_node_type_t fn_type;
+#endif
+ /**
+ * The node's VFT.
+ * we could store the type here instead, and lookup the VFT using that. But
+ * I like this better,
+ */
+ const fib_node_vft_t *fn_vft;
+
+ /**
+ * Vector of nodes that depend upon/use/share this node
+ */
+ fib_node_list_t fn_children;
+
+ /**
+ * Number of dependents on this node. This number includes the number
+ * of children
+ */
+ u32 fn_locks;
+} fib_node_t;
+
+/**
+ * @brief
+ * Register the function table for a given type
+ *
+ * @param ft
+ * FIB node type
+ *
+ * @param vft
+ * virtual function table
+ */
+extern void fib_node_register_type (fib_node_type_t ft,
+ const fib_node_vft_t *vft);
+
+/**
+ * @brief
+ * Create a new FIB node type and Register the function table for it.
+ *
+ * @param vft
+ * virtual function table
+ *
+ * @return new FIB node type
+ */
+extern fib_node_type_t fib_node_register_new_type (const fib_node_vft_t *vft);
+
+/**
+ * @brief Show the memory usage for a type
+ *
+ * This should be invoked by the type in response to the infra calling
+ * its registered memory show function
+ *
+ * @param name the name of the type
+ * @param in_use_elts The number of elements in use
+ * @param allocd_elts The number of allocated pool elemenets
+ * @param size_elt The size of one element
+ */
+extern void fib_show_memory_usage(const char *name,
+ u32 in_use_elts,
+ u32 allocd_elts,
+ size_t size_elt);
+
+extern void fib_node_init(fib_node_t *node,
+ fib_node_type_t ft);
+extern void fib_node_deinit(fib_node_t *node);
+
+extern void fib_node_lock(fib_node_t *node);
+extern void fib_node_unlock(fib_node_t *node);
+
+extern u32 fib_node_get_n_children(fib_node_type_t parent_type,
+ fib_node_index_t parent_index);
+extern u32 fib_node_child_add(fib_node_type_t parent_type,
+ fib_node_index_t parent_index,
+ fib_node_type_t child_type,
+ fib_node_index_t child_index);
+extern void fib_node_child_remove(fib_node_type_t parent_type,
+ fib_node_index_t parent_index,
+ fib_node_index_t sibling_index);
+
+extern fib_node_back_walk_rc_t fib_node_back_walk_one(fib_node_ptr_t *ptr,
+ fib_node_back_walk_ctx_t *ctx);
+
+extern u8* fib_node_children_format(fib_node_list_t list,
+ u8 *s);
+
+extern const char* fib_node_type_get_name(fib_node_type_t type);
+
+static inline int
+fib_node_index_is_valid (fib_node_index_t ni)
+{
+ return (FIB_NODE_INDEX_INVALID != ni);
+}
+
+#endif
+