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/*
* Copyright (c) 2008-2017 Nicira, Inc.
*
* 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 OPENVSWITCH_NAMEMAP_H
#define OPENVSWITCH_NAMEMAP_H 1
#include "openvswitch/hmap.h"
struct ds;
#ifdef __cplusplus
extern "C" {
#endif
/* Name-number mapping.
*
* This data structure tracks and manages a mapping between names and 32-bit
* unsigned integers, with provision for detecting names that are used more
* than once.
*
* This structure is suitable for tracking mappings between OpenFlow port names
* and numbers. OpenFlow doesn't require either these kinds of names to be
* unique, and in OVS it's possible for two ports to appear to have the same
* name if their names are longer than the maximum length supported by a given
* version of OpenFlow.
*
* OpenFlow does require port numbers to be unique. We check for duplicate
* ports numbers just in case a switch has a bug.
*
* This structure is also suitable for tracking mappings between OpenFlow table
* names and number. OpenFlow doesn't require table names to be unique and
* Open vSwitch doesn't try to make them unique. */
struct namemap_node {
struct hmap_node name_node;
struct hmap_node number_node;
uint32_t number;
char *name;
bool duplicate;
};
struct namemap {
struct hmap by_name;
struct hmap by_number;
};
#define NAMEMAP_INITIALIZER(MAP) \
{ HMAP_INITIALIZER(&(MAP)->by_name), HMAP_INITIALIZER(&(MAP)->by_number) }
void namemap_init(struct namemap *);
struct namemap_node *namemap_find_by_name(const struct namemap *,
const char *);
struct namemap_node *namemap_find_by_number(const struct namemap *, uint32_t);
void namemap_put(struct namemap *, uint32_t, const char *);
void namemap_destroy(struct namemap *);
void namemap_put_name(const char *, struct ds *);
#ifdef __cplusplus
}
#endif
#endif /* namemap.h */
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