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
8 * like to make the Software available for broadest use, with as few
9 * restrictions as possible permission is hereby granted, free of
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11 * the Software under the copyrights without restriction, including
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13 * distribute, sublicense, and/or sell copies of the Software, and to
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,
21 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
22 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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24 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
25 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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29 * The name and trademarks of copyright holder(s) may NOT be used in
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31 * derivatives without specific, written prior permission.
38 #include "switch-flow.h"
41 #define THIS_MODULE VLM_chain
44 /* Attempts to append 'table' to the set of tables in 'chain'. Returns 0 or
45 * negative error. If 'table' is null it is assumed that table creation failed
46 * due to out-of-memory. */
47 static int add_table(struct sw_chain *chain, struct sw_table *table)
51 if (chain->n_tables >= CHAIN_MAX_TABLES) {
52 VLOG_ERR("too many tables in chain\n");
53 table->destroy(table);
56 chain->tables[chain->n_tables++] = table;
60 /* Creates and returns a new chain. Returns NULL if the chain cannot be
62 struct sw_chain *chain_create(void)
64 struct sw_chain *chain = calloc(1, sizeof *chain);
68 if (add_table(chain, table_mac_create(TABLE_MAC_NUM_BUCKETS,
70 || add_table(chain, table_hash2_create(0x1EDC6F41, TABLE_HASH_MAX_FLOWS,
71 0x741B8CD7, TABLE_HASH_MAX_FLOWS))
72 || add_table(chain, table_linear_create(TABLE_LINEAR_MAX_FLOWS))) {
80 /* Searches 'chain' for a flow matching 'key', which must not have any wildcard
81 * fields. Returns the flow if successful, otherwise a null pointer. */
83 chain_lookup(struct sw_chain *chain, const struct sw_flow_key *key)
87 assert(!key->wildcards);
88 for (i = 0; i < chain->n_tables; i++) {
89 struct sw_table *t = chain->tables[i];
90 struct sw_flow *flow = t->lookup(t, key);
97 /* Inserts 'flow' into 'chain', replacing any duplicate flow. Returns 0 if
98 * successful or a negative error.
100 * If successful, 'flow' becomes owned by the chain, otherwise it is retained
103 chain_insert(struct sw_chain *chain, struct sw_flow *flow)
107 for (i = 0; i < chain->n_tables; i++) {
108 struct sw_table *t = chain->tables[i];
109 if (t->insert(t, flow))
116 /* Deletes from 'chain' any and all flows that match 'key'. Returns the number
117 * of flows that were deleted.
119 * Expensive in the general case as currently implemented, since it requires
120 * iterating through the entire contents of each table for keys that contain
121 * wildcards. Relatively cheap for fully specified keys.
123 * The caller need not hold any locks. */
125 chain_delete(struct sw_chain *chain, const struct sw_flow_key *key, int strict)
130 for (i = 0; i < chain->n_tables; i++) {
131 struct sw_table *t = chain->tables[i];
132 count += t->delete(t, key, strict);
139 /* Performs timeout processing on all the tables in 'chain'. Returns the
140 * number of flow entries deleted through expiration.
142 * Expensive as currently implemented, since it iterates through the entire
143 * contents of each table.
145 * The caller need not hold any locks. */
147 chain_timeout(struct sw_chain *chain, struct datapath *dp)
152 for (i = 0; i < chain->n_tables; i++) {
153 struct sw_table *t = chain->tables[i];
154 count += t->timeout(dp, t);
159 /* Destroys 'chain', which must not have any users. */
161 chain_destroy(struct sw_chain *chain)
165 for (i = 0; i < chain->n_tables; i++) {
166 struct sw_table *t = chain->tables[i];
172 /* Prints statistics for each of the tables in 'chain'. */
174 chain_print_stats(struct sw_chain *chain)
179 for (i = 0; i < chain->n_tables; i++) {
180 struct sw_table *t = chain->tables[i];
181 struct sw_table_stats stats;
183 printf("%s: %lu/%lu flows\n",
184 stats.name, stats.n_flows, stats.max_flows);