/*
- * Copyright (c) 2009, 2010, 2011, 2012 Nicira, Inc.
+ * Copyright (c) 2009, 2010, 2011, 2012, 2013 Nicira, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
static void destroy_table(struct classifier *, struct cls_table *);
+static void update_tables_after_insertion(struct classifier *,
+ struct cls_table *,
+ unsigned int new_priority);
+static void update_tables_after_removal(struct classifier *,
+ struct cls_table *,
+ unsigned int del_priority);
+
static struct cls_rule *find_match(const struct cls_table *,
const struct flow *);
static struct cls_rule *find_equal(struct cls_table *,
const struct miniflow *, uint32_t hash);
-static struct cls_rule *insert_rule(struct cls_table *, struct cls_rule *);
+static struct cls_rule *insert_rule(struct classifier *,
+ struct cls_table *, struct cls_rule *);
/* Iterates RULE over HEAD and all of the cls_rules on HEAD->list. */
#define FOR_EACH_RULE_IN_LIST(RULE, HEAD) \
{
cls->n_rules = 0;
hmap_init(&cls->tables);
+ list_init(&cls->tables_priority);
}
/* Destroys 'cls'. Rules within 'cls', if any, are not freed; this is the
table = insert_table(cls, &rule->match.mask);
}
- old_rule = insert_rule(table, rule);
+ old_rule = insert_rule(cls, table, rule);
if (!old_rule) {
table->n_table_rules++;
cls->n_rules++;
if (--table->n_table_rules == 0) {
destroy_table(cls, table);
- } else if (rule->priority == table->max_priority
- && --table->max_count == 0) {
- /* Maintain table's max_priority. */
- struct cls_rule *head;
-
- table->max_priority = 0;
- HMAP_FOR_EACH (head, hmap_node, &table->rules) {
- if (head->priority > table->max_priority) {
- table->max_priority = head->priority;
- table->max_count = 1;
- } else if (head->priority == table->max_priority) {
- ++table->max_count;
- }
- }
+ } else {
+ update_tables_after_removal(cls, table, rule->priority);
}
cls->n_rules--;
}
struct cls_rule *best;
best = NULL;
- HMAP_FOR_EACH (table, hmap_node, &cls->tables) {
- /* Find only if there is hope.
- * Would be even better to search the tables in the descending
- * order of max_priority. */
- if (!best || table->max_priority > best->priority) {
- struct cls_rule *rule = find_match(table, flow);
- if (rule && (!best || rule->priority > best->priority)) {
- best = rule;
+ LIST_FOR_EACH (table, list_node, &cls->tables_priority) {
+ struct cls_rule *rule = find_match(table, flow);
+ if (rule) {
+ best = rule;
+ LIST_FOR_EACH_CONTINUE (table, list_node, &cls->tables_priority) {
+ if (table->max_priority <= best->priority) {
+ /* Tables in descending priority order,
+ * can not find anything better. */
+ return best;
+ }
+ rule = find_match(table, flow);
+ if (rule && rule->priority > best->priority) {
+ best = rule;
+ }
}
+ break;
}
}
return best;
{
struct cls_table *table;
- HMAP_FOR_EACH (table, hmap_node, &cls->tables) {
+ /* Iterate tables in the descending max priority order. */
+ LIST_FOR_EACH (table, list_node, &cls->tables_priority) {
uint32_t storage[FLOW_U32S];
struct minimask mask;
struct cls_rule *head;
if (target->priority > table->max_priority) {
- continue; /* Can skip this table. */
+ break; /* Can skip this and the rest of the tables. */
}
minimask_combine(&mask, &target->match.mask, &table->mask, storage);
hmap_init(&table->rules);
minimask_clone(&table->mask, mask);
hmap_insert(&cls->tables, &table->hmap_node, minimask_hash(mask, 0));
+ list_push_back(&cls->tables_priority, &table->list_node);
return table;
}
minimask_destroy(&table->mask);
hmap_remove(&cls->tables, &table->hmap_node);
hmap_destroy(&table->rules);
+ list_remove(&table->list_node);
free(table);
}
+/* This function performs the following updates for 'table' in 'cls' following
+ * the addition of a new rule with priority 'new_priority' to 'table':
+ *
+ * - Update 'table->max_priority' and 'table->max_count' if necessary.
+ *
+ * - Update 'table''s position in 'cls->tables_priority' if necessary.
+ *
+ * This function should only be called after adding a new rule, not after
+ * replacing a rule by an identical one or modifying a rule in-place. */
+static void
+update_tables_after_insertion(struct classifier *cls, struct cls_table *table,
+ unsigned int new_priority)
+{
+ if (new_priority == table->max_priority) {
+ ++table->max_count;
+ } else if (new_priority > table->max_priority) {
+ struct cls_table *iter;
+
+ table->max_priority = new_priority;
+ table->max_count = 1;
+
+ /* Possibly move 'table' earlier in the priority list. If we break out
+ * of the loop, then 'table' should be moved just after that 'iter'.
+ * If the loop terminates normally, then 'iter' will be the list head
+ * and we'll move table just after that (e.g. to the front of the
+ * list). */
+ iter = table;
+ LIST_FOR_EACH_REVERSE_CONTINUE (iter, list_node,
+ &cls->tables_priority) {
+ if (iter->max_priority >= table->max_priority) {
+ break;
+ }
+ }
+
+ /* Move 'table' just after 'iter' (unless it's already there). */
+ if (iter->list_node.next != &table->list_node) {
+ list_splice(iter->list_node.next,
+ &table->list_node, table->list_node.next);
+ }
+ }
+}
+
+/* This function performs the following updates for 'table' in 'cls' following
+ * the deletion of a rule with priority 'del_priority' from 'table':
+ *
+ * - Update 'table->max_priority' and 'table->max_count' if necessary.
+ *
+ * - Update 'table''s position in 'cls->tables_priority' if necessary.
+ *
+ * This function should only be called after removing a rule, not after
+ * replacing a rule by an identical one or modifying a rule in-place. */
+static void
+update_tables_after_removal(struct classifier *cls, struct cls_table *table,
+ unsigned int del_priority)
+{
+ struct cls_table *iter;
+
+ if (del_priority == table->max_priority && --table->max_count == 0) {
+ struct cls_rule *head;
+
+ table->max_priority = 0;
+ HMAP_FOR_EACH (head, hmap_node, &table->rules) {
+ if (head->priority > table->max_priority) {
+ table->max_priority = head->priority;
+ table->max_count = 1;
+ } else if (head->priority == table->max_priority) {
+ ++table->max_count;
+ }
+ }
+
+ /* Possibly move 'table' later in the priority list. If we break out
+ * of the loop, then 'table' should be moved just before that 'iter'.
+ * If the loop terminates normally, then 'iter' will be the list head
+ * and we'll move table just before that (e.g. to the back of the
+ * list). */
+ iter = table;
+ LIST_FOR_EACH_CONTINUE (iter, list_node, &cls->tables_priority) {
+ if (iter->max_priority <= table->max_priority) {
+ break;
+ }
+ }
+
+ /* Move 'table' just before 'iter' (unless it's already there). */
+ if (iter->list_node.prev != &table->list_node) {
+ list_splice(&iter->list_node,
+ &table->list_node, table->list_node.next);
+ }
+ }
+}
+
static struct cls_rule *
find_match(const struct cls_table *table, const struct flow *flow)
{
}
static struct cls_rule *
-insert_rule(struct cls_table *table, struct cls_rule *new)
+insert_rule(struct classifier *cls,
+ struct cls_table *table, struct cls_rule *new)
{
struct cls_rule *head;
struct cls_rule *old = NULL;
}
out:
- if (new->priority > table->max_priority) {
- table->max_priority = new->priority;
- table->max_count = 1;
- } else if (!old && new->priority == table->max_priority) {
- /* Only if we are not replacing an old entry. */
- ++table->max_count;
+ if (!old) {
+ update_tables_after_insertion(cls, table, new->priority);
}
-
return old;
}
git://git.onelab.eu / sliver-openvswitch.git / blobdiff