1 /* Copyright (c) 2008 The Board of Trustees of The Leland Stanford
4 * We are making the OpenFlow specification and associated documentation
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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
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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_hash2_create(0x1EDC6F41, TABLE_HASH_MAX_FLOWS,
69 0x741B8CD7, TABLE_HASH_MAX_FLOWS))
70 || add_table(chain, table_linear_create(TABLE_LINEAR_MAX_FLOWS))) {
78 /* Searches 'chain' for a flow matching 'key', which must not have any wildcard
79 * fields. Returns the flow if successful, otherwise a null pointer. */
81 chain_lookup(struct sw_chain *chain, const struct sw_flow_key *key)
85 assert(!key->wildcards);
86 for (i = 0; i < chain->n_tables; i++) {
87 struct sw_table *t = chain->tables[i];
88 struct sw_flow *flow = t->lookup(t, key);
95 /* Inserts 'flow' into 'chain', replacing any duplicate flow. Returns 0 if
96 * successful or a negative error.
98 * If successful, 'flow' becomes owned by the chain, otherwise it is retained
101 chain_insert(struct sw_chain *chain, struct sw_flow *flow)
105 for (i = 0; i < chain->n_tables; i++) {
106 struct sw_table *t = chain->tables[i];
107 if (t->insert(t, flow))
114 /* Deletes from 'chain' any and all flows that match 'key'. Returns the number
115 * of flows that were deleted.
117 * Expensive in the general case as currently implemented, since it requires
118 * iterating through the entire contents of each table for keys that contain
119 * wildcards. Relatively cheap for fully specified keys. */
121 chain_delete(struct sw_chain *chain, const struct sw_flow_key *key,
122 uint16_t priority, int strict)
127 for (i = 0; i < chain->n_tables; i++) {
128 struct sw_table *t = chain->tables[i];
129 count += t->delete(t, key, priority, strict);
136 /* Deletes timed-out flow entries from all the tables in 'chain' and appends
137 * the deleted flows to 'deleted'.
139 * Expensive as currently implemented, since it iterates through the entire
140 * contents of each table. */
142 chain_timeout(struct sw_chain *chain, struct list *deleted)
146 for (i = 0; i < chain->n_tables; i++) {
147 struct sw_table *t = chain->tables[i];
148 t->timeout(t, deleted);
152 /* Destroys 'chain', which must not have any users. */
154 chain_destroy(struct sw_chain *chain)
158 for (i = 0; i < chain->n_tables; i++) {
159 struct sw_table *t = chain->tables[i];
165 /* Prints statistics for each of the tables in 'chain'. */
167 chain_print_stats(struct sw_chain *chain)
172 for (i = 0; i < chain->n_tables; i++) {
173 struct sw_table *t = chain->tables[i];
174 struct sw_table_stats stats;
176 printf("%s: %lu/%lu flows\n",
177 stats.name, stats.n_flows, stats.max_flows);