/*
- * 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.
#include "odp-util.h"
#include "ofp-util.h"
#include "packets.h"
+#include "ovs-thread.h"
static struct cls_table *find_table(const struct classifier *,
const struct minimask *);
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) \
/* Initializes 'dst' as a copy of 'src'.
*
- * The caller must eventually destroy 'rule' with cls_rule_destroy(). */
+ * The caller must eventually destroy 'dst' with cls_rule_destroy(). */
void
cls_rule_clone(struct cls_rule *dst, const struct cls_rule *src)
{
dst->priority = src->priority;
}
+/* Initializes 'dst' with the data in 'src', destroying 'src'.
+ *
+ * The caller must eventually destroy 'dst' with cls_rule_destroy(). */
+void
+cls_rule_move(struct cls_rule *dst, struct cls_rule *src)
+{
+ minimatch_move(&dst->match, &src->match);
+ dst->priority = src->priority;
+}
+
/* Frees memory referenced by 'rule'. Doesn't free 'rule' itself (it's
* normally embedded into a larger structure).
*
cls->n_rules = 0;
hmap_init(&cls->tables);
list_init(&cls->tables_priority);
+ ovs_rwlock_init(&cls->rwlock);
}
/* Destroys 'cls'. Rules within 'cls', if any, are not freed; this is the
destroy_table(cls, table);
}
hmap_destroy(&cls->tables);
+ ovs_rwlock_destroy(&cls->rwlock);
}
}
return cls->n_rules;
}
-static void
-classifier_update_table_max_priority(struct classifier *cls,
- struct cls_table *table,
- unsigned int priority)
-{
- struct cls_table *iter = table;
-
- if (priority > table->max_priority) {
- /* 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). */
- LIST_FOR_EACH_REVERSE_CONTINUE (iter, list_node,
- &cls->tables_priority) {
- if (iter->max_priority >= 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);
- }
- } else if (priority < table->max_priority) {
- /* Possibly move 'table' earlier 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). */
- LIST_FOR_EACH_CONTINUE (iter, list_node, &cls->tables_priority) {
- if (iter->max_priority <= 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);
- }
- }
- table->max_priority = priority;
-}
-
/* Inserts 'rule' into 'cls'. Until 'rule' is removed from 'cls', the caller
* must not modify or free it.
*
table = insert_table(cls, &rule->match.mask);
}
- old_rule = insert_rule(table, rule);
-
- if (rule->priority > table->max_priority) {
- classifier_update_table_max_priority(cls, table, rule->priority);
- table->max_count = 1;
- } else if (!old_rule && rule->priority == table->max_priority) {
- /* Only if we are not replacing an old entry. */
- ++table->max_count;
- }
-
+ 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;
- unsigned int new_max_priority = 0;
- HMAP_FOR_EACH (head, hmap_node, &table->rules) {
- if (head->priority > new_max_priority) {
- new_max_priority = head->priority;
- table->max_count = 1;
- } else if (head->priority == new_max_priority) {
- ++table->max_count;
- }
- }
- classifier_update_table_max_priority(cls, table, new_max_priority);
+ } else {
+ update_tables_after_removal(cls, table, rule->priority);
}
cls->n_rules--;
}
/* Finds and returns the highest-priority rule in 'cls' that matches 'flow'.
* Returns a null pointer if no rules in 'cls' match 'flow'. If multiple rules
- * of equal priority match 'flow', returns one arbitrarily. */
+ * of equal priority match 'flow', returns one arbitrarily.
+ *
+ * If a rule is found and 'wc' is non-null, bitwise-OR's 'wc' with the
+ * set of bits that were significant in the lookup. At some point
+ * earlier, 'wc' should have been initialized (e.g., by
+ * flow_wildcards_init_catchall()). */
struct cls_rule *
-classifier_lookup(const struct classifier *cls, const struct flow *flow)
+classifier_lookup(const struct classifier *cls, const struct flow *flow,
+ struct flow_wildcards *wc)
{
struct cls_table *table;
struct cls_rule *best;
best = NULL;
LIST_FOR_EACH (table, list_node, &cls->tables_priority) {
struct cls_rule *rule = find_match(table, flow);
+
+ if (wc) {
+ flow_wildcards_fold_minimask(wc, &table->mask);
+ }
if (rule) {
best = rule;
LIST_FOR_EACH_CONTINUE (table, list_node, &cls->tables_priority) {
return best;
}
rule = find_match(table, flow);
+ if (wc) {
+ flow_wildcards_fold_minimask(wc, &table->mask);
+ }
if (rule && rule->priority > best->priority) {
best = rule;
}
/* Returns the next matching cls_rule in 'cursor''s iteration, or a null
* pointer if there are no more matches. */
struct cls_rule *
-cls_cursor_next(struct cls_cursor *cursor, struct cls_rule *rule)
+cls_cursor_next(struct cls_cursor *cursor, const struct cls_rule *rule_)
{
+ struct cls_rule *rule = CONST_CAST(struct cls_rule *, rule_);
const struct cls_table *table;
struct cls_rule *next;
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;
new->hmap_node.hash = miniflow_hash_in_minimask(&new->match.flow,
&new->match.mask, 0);
if (!head) {
hmap_insert(&table->rules, &new->hmap_node, new->hmap_node.hash);
list_init(&new->list);
- return NULL;
+ goto out;
} else {
/* Scan the list for the insertion point that will keep the list in
* order of decreasing priority. */
if (new->priority == rule->priority) {
list_replace(&new->list, &rule->list);
- return rule;
+ old = rule;
+ goto out;
} else {
list_insert(&rule->list, &new->list);
- return NULL;
+ goto out;
}
}
}
/* Insert 'new' at the end of the list. */
list_push_back(&head->list, &new->list);
- return NULL;
}
+
+ out:
+ if (!old) {
+ update_tables_after_insertion(cls, table, new->priority);
+ }
+ return old;
}
static struct cls_rule *
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