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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39 #include "switch-flow.h"
42 #define THIS_MODULE VLM_chain
45 /* Attempts to append 'table' to the set of tables in 'chain'. Returns 0 or
46 * negative error. If 'table' is null it is assumed that table creation failed
47 * due to out-of-memory. */
48 static int add_table(struct sw_chain *chain, struct sw_table *table)
52 if (chain->n_tables >= CHAIN_MAX_TABLES) {
53 VLOG_ERR("too many tables in chain\n");
54 table->destroy(table);
57 chain->tables[chain->n_tables++] = table;
61 /* Creates and returns a new chain. Returns NULL if the chain cannot be
63 struct sw_chain *chain_create(void)
65 struct sw_chain *chain = calloc(1, sizeof *chain);
69 if (add_table(chain, table_hash2_create(0x1EDC6F41, TABLE_HASH_MAX_FLOWS,
70 0x741B8CD7, TABLE_HASH_MAX_FLOWS))
71 || add_table(chain, table_linear_create(TABLE_LINEAR_MAX_FLOWS))) {
79 /* Searches 'chain' for a flow matching 'key', which must not have any wildcard
80 * fields. Returns the flow if successful, otherwise a null pointer. */
82 chain_lookup(struct sw_chain *chain, const struct sw_flow_key *key)
86 assert(!key->wildcards);
87 for (i = 0; i < chain->n_tables; i++) {
88 struct sw_table *t = chain->tables[i];
89 struct sw_flow *flow = t->lookup(t, key);
96 /* Inserts 'flow' into 'chain', replacing any duplicate flow. Returns 0 if
97 * successful or a negative error.
99 * If successful, 'flow' becomes owned by the chain, otherwise it is retained
102 chain_insert(struct sw_chain *chain, struct sw_flow *flow)
106 for (i = 0; i < chain->n_tables; i++) {
107 struct sw_table *t = chain->tables[i];
108 if (t->insert(t, flow))
115 /* Deletes from 'chain' any and all flows that match 'key'. Returns the number
116 * of flows that were deleted.
118 * Expensive in the general case as currently implemented, since it requires
119 * iterating through the entire contents of each table for keys that contain
120 * wildcards. Relatively cheap for fully specified keys. */
122 chain_delete(struct sw_chain *chain, const struct sw_flow_key *key,
123 uint16_t priority, int strict)
128 for (i = 0; i < chain->n_tables; i++) {
129 struct sw_table *t = chain->tables[i];
130 count += t->delete(t, key, priority, strict);
137 /* Deletes timed-out flow entries from all the tables in 'chain' and appends
138 * the deleted flows to 'deleted'.
140 * Expensive as currently implemented, since it iterates through the entire
141 * contents of each table. */
143 chain_timeout(struct sw_chain *chain, struct list *deleted)
147 for (i = 0; i < chain->n_tables; i++) {
148 struct sw_table *t = chain->tables[i];
149 t->timeout(t, deleted);
153 /* Destroys 'chain', which must not have any users. */
155 chain_destroy(struct sw_chain *chain)
159 for (i = 0; i < chain->n_tables; i++) {
160 struct sw_table *t = chain->tables[i];
166 /* Prints statistics for each of the tables in 'chain'. */
168 chain_print_stats(struct sw_chain *chain)
173 for (i = 0; i < chain->n_tables; i++) {
174 struct sw_table *t = chain->tables[i];
175 struct sw_table_stats stats;
177 printf("%s: %lu/%lu flows\n",
178 stats.name, stats.n_flows, stats.max_flows);