1 /* Copyright (c) 2008 The Board of Trustees of The Leland Stanford
4 * We are making the OpenFlow specification and associated documentation
5 * (Software) available for public use and benefit with the expectation
6 * that others will use, modify and enhance the Software and contribute
7 * those enhancements back to the community. However, since we would
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14 * permit persons to whom the Software is furnished to do so, subject to
15 * the following conditions:
17 * The above copyright notice and this permission notice shall be
18 * included in all copies or substantial portions of the Software.
20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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22 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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29 * The name and trademarks of copyright holder(s) may NOT be used in
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34 /* Individual switching tables. Generally grouped together in a chain (see
46 /* Table statistics. */
47 struct sw_table_stats {
48 const char *name; /* Human-readable name. */
49 unsigned long int n_flows; /* Number of active flows. */
50 unsigned long int max_flows; /* Flow capacity. */
53 /* Position within an iteration of a sw_table.
55 * The contents are private to the table implementation, except that a position
56 * initialized to all-zero-bits represents the start of a table. */
57 struct sw_table_position {
58 unsigned long private[4];
61 /* A single table of flows. */
63 /* Searches 'table' for a flow matching 'key', which must not have any
64 * wildcard fields. Returns the flow if successful, a null pointer
66 struct sw_flow *(*lookup)(struct sw_table *table,
67 const struct sw_flow_key *key);
69 /* Inserts 'flow' into 'table', replacing any duplicate flow. Returns
70 * 0 if successful or a negative error. Error can be due to an
71 * over-capacity table or because the flow is not one of the kind that
74 * If successful, 'flow' becomes owned by 'table', otherwise it is
75 * retained by the caller. */
76 int (*insert)(struct sw_table *table, struct sw_flow *flow);
78 /* Deletes from 'table' any and all flows that match 'key' from
79 * 'table'. If 'strict' set, wildcards must match. Returns the
80 * number of flows that were deleted. */
81 int (*delete)(struct sw_table *table, const struct sw_flow_key *key,
82 uint16_t priority, int strict);
84 /* Performs timeout processing on all the flow entries in 'table'.
85 * Appends all the flow entries removed from 'table' to 'deleted' for the
87 void (*timeout)(struct sw_table *table, struct list *deleted);
89 /* Destroys 'table', which must not have any users. */
90 void (*destroy)(struct sw_table *table);
92 /* Iterates through the flow entries in 'table', passing each one
93 * matches 'key' to 'callback'. The callback function should return 0
94 * to continue iteration or a nonzero error code to stop. The iterator
95 * function returns either 0 if the table iteration completed or the
96 * value returned by the callback function otherwise.
98 * The iteration starts at 'position', which may be initialized to
99 * all-zero-bits to iterate from the beginning of the table. If the
100 * iteration terminates due to an error from the callback function,
101 * 'position' is updated to a value that can be passed back to the
102 * iterator function to resume iteration later with the following
104 int (*iterate)(struct sw_table *table,
105 const struct sw_flow_key *key,
106 struct sw_table_position *position,
107 int (*callback)(struct sw_flow *flow, void *private),
110 /* Dumps statistics for 'table' into 'stats'. */
111 void (*stats)(struct sw_table *table, struct sw_table_stats *stats);
114 struct sw_table *table_hash_create(unsigned int polynomial,
115 unsigned int n_buckets);
116 struct sw_table *table_hash2_create(unsigned int poly0, unsigned int buckets0,
117 unsigned int poly1, unsigned int buckets1);
118 struct sw_table *table_linear_create(unsigned int max_flows);