/*
- * 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 <config.h>
#include "classifier.h"
-#include <assert.h>
#include <errno.h>
#include <netinet/in.h>
#include "byte-order.h"
#include "odp-util.h"
#include "ofp-util.h"
#include "packets.h"
-
-static struct cls_table *find_table(const struct classifier *,
- const struct minimask *);
-static struct cls_table *insert_table(struct classifier *,
- const struct minimask *);
-
-static void destroy_table(struct classifier *, struct cls_table *);
-
-static struct cls_rule *find_match(const struct cls_table *,
- const struct flow *);
-static struct cls_rule *find_equal(struct cls_table *,
+#include "ovs-thread.h"
+
+static struct cls_subtable *find_subtable(const struct classifier *,
+ const struct minimask *);
+static struct cls_subtable *insert_subtable(struct classifier *,
+ const struct minimask *);
+
+static void destroy_subtable(struct classifier *, struct cls_subtable *);
+
+static void update_subtables_after_insertion(struct classifier *,
+ struct cls_subtable *,
+ unsigned int new_priority);
+static void update_subtables_after_removal(struct classifier *,
+ struct cls_subtable *,
+ unsigned int del_priority);
+
+static struct cls_rule *find_match_wc(const struct cls_subtable *,
+ const struct flow *,
+ struct flow_wildcards *);
+static struct cls_rule *find_equal(struct cls_subtable *,
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_subtable *, 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).
*
/* Initializes 'cls' as a classifier that initially contains no classification
* rules. */
void
-classifier_init(struct classifier *cls)
+classifier_init(struct classifier *cls, const uint8_t *flow_segments)
{
cls->n_rules = 0;
- hmap_init(&cls->tables);
+ hmap_init(&cls->subtables);
+ list_init(&cls->subtables_priority);
+ hmap_init(&cls->partitions);
+ ovs_rwlock_init(&cls->rwlock);
+ cls->n_flow_segments = 0;
+ if (flow_segments) {
+ while (cls->n_flow_segments < CLS_MAX_INDICES
+ && *flow_segments < FLOW_U32S) {
+ cls->flow_segments[cls->n_flow_segments++] = *flow_segments++;
+ }
+ }
}
/* Destroys 'cls'. Rules within 'cls', if any, are not freed; this is the
classifier_destroy(struct classifier *cls)
{
if (cls) {
- struct cls_table *table, *next_table;
+ struct cls_subtable *partition, *next_partition;
+ struct cls_subtable *subtable, *next_subtable;
- HMAP_FOR_EACH_SAFE (table, next_table, hmap_node, &cls->tables) {
- hmap_destroy(&table->rules);
- hmap_remove(&cls->tables, &table->hmap_node);
- free(table);
+ HMAP_FOR_EACH_SAFE (subtable, next_subtable, hmap_node,
+ &cls->subtables) {
+ destroy_subtable(cls, subtable);
}
- hmap_destroy(&cls->tables);
+ hmap_destroy(&cls->subtables);
+
+ HMAP_FOR_EACH_SAFE (partition, next_partition, hmap_node,
+ &cls->partitions) {
+ hmap_remove(&cls->partitions, &partition->hmap_node);
+ free(partition);
+ }
+ hmap_destroy(&cls->partitions);
+ ovs_rwlock_destroy(&cls->rwlock);
}
}
return cls->n_rules;
}
+static uint32_t
+hash_metadata(ovs_be64 metadata_)
+{
+ uint64_t metadata = (OVS_FORCE uint64_t) metadata_;
+ return hash_2words(metadata, metadata >> 32);
+}
+
+static struct cls_partition *
+find_partition(const struct classifier *cls, ovs_be64 metadata, uint32_t hash)
+{
+ struct cls_partition *partition;
+
+ HMAP_FOR_EACH_IN_BUCKET (partition, hmap_node, hash, &cls->partitions) {
+ if (partition->metadata == metadata) {
+ return partition;
+ }
+ }
+
+ return NULL;
+}
+
+static struct cls_partition *
+create_partition(struct classifier *cls, struct cls_subtable *subtable,
+ ovs_be64 metadata)
+{
+ uint32_t hash = hash_metadata(metadata);
+ struct cls_partition *partition = find_partition(cls, metadata, hash);
+ if (!partition) {
+ partition = xmalloc(sizeof *partition);
+ partition->metadata = metadata;
+ partition->tags = 0;
+ tag_tracker_init(&partition->tracker);
+ hmap_insert(&cls->partitions, &partition->hmap_node, hash);
+ }
+ tag_tracker_add(&partition->tracker, &partition->tags, subtable->tag);
+ return partition;
+}
+
/* Inserts 'rule' into 'cls'. Until 'rule' is removed from 'cls', the caller
* must not modify or free it.
*
classifier_replace(struct classifier *cls, struct cls_rule *rule)
{
struct cls_rule *old_rule;
- struct cls_table *table;
+ struct cls_subtable *subtable;
- table = find_table(cls, &rule->match.mask);
- if (!table) {
- table = insert_table(cls, &rule->match.mask);
+ subtable = find_subtable(cls, &rule->match.mask);
+ if (!subtable) {
+ subtable = insert_subtable(cls, &rule->match.mask);
}
- old_rule = insert_rule(table, rule);
+ old_rule = insert_rule(cls, subtable, rule);
if (!old_rule) {
- table->n_table_rules++;
+ if (minimask_get_metadata_mask(&rule->match.mask) == OVS_BE64_MAX) {
+ ovs_be64 metadata = miniflow_get_metadata(&rule->match.flow);
+ rule->partition = create_partition(cls, subtable, metadata);
+ } else {
+ rule->partition = NULL;
+ }
+
+ subtable->n_rules++;
cls->n_rules++;
+ } else {
+ rule->partition = old_rule->partition;
}
return old_rule;
}
classifier_insert(struct classifier *cls, struct cls_rule *rule)
{
struct cls_rule *displaced_rule = classifier_replace(cls, rule);
- assert(!displaced_rule);
+ ovs_assert(!displaced_rule);
}
/* Removes 'rule' from 'cls'. It is the caller's responsibility to destroy
void
classifier_remove(struct classifier *cls, struct cls_rule *rule)
{
+ struct cls_partition *partition;
struct cls_rule *head;
- struct cls_table *table;
+ struct cls_subtable *subtable;
+ int i;
+
+ subtable = find_subtable(cls, &rule->match.mask);
+
+ /* Remove rule node from indices. */
+ for (i = 0; i < subtable->n_indices; i++) {
+ hindex_remove(&subtable->indices[i], &rule->index_nodes[i]);
+ }
- table = find_table(cls, &rule->match.mask);
- head = find_equal(table, &rule->match.flow, rule->hmap_node.hash);
+ head = find_equal(subtable, &rule->match.flow, rule->hmap_node.hash);
if (head != rule) {
list_remove(&rule->list);
} else if (list_is_empty(&rule->list)) {
- hmap_remove(&table->rules, &rule->hmap_node);
+ hmap_remove(&subtable->rules, &rule->hmap_node);
} else {
struct cls_rule *next = CONTAINER_OF(rule->list.next,
struct cls_rule, list);
list_remove(&rule->list);
- hmap_replace(&table->rules, &rule->hmap_node, &next->hmap_node);
+ hmap_replace(&subtable->rules, &rule->hmap_node, &next->hmap_node);
}
- if (--table->n_table_rules == 0) {
- destroy_table(cls, table);
+ partition = rule->partition;
+ if (partition) {
+ tag_tracker_subtract(&partition->tracker, &partition->tags,
+ subtable->tag);
+ if (!partition->tags) {
+ hmap_remove(&cls->partitions, &partition->hmap_node);
+ free(partition);
+ }
}
+ if (--subtable->n_rules == 0) {
+ destroy_subtable(cls, subtable);
+ } else {
+ update_subtables_after_removal(cls, subtable, 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;
+ const struct cls_partition *partition;
+ struct cls_subtable *subtable;
struct cls_rule *best;
+ tag_type tags;
+
+ /* Determine 'tags' such that, if 'subtable->tag' doesn't intersect them,
+ * then 'flow' cannot possibly match in 'subtable':
+ *
+ * - If flow->metadata maps to a given 'partition', then we can use
+ * 'tags' for 'partition->tags'.
+ *
+ * - If flow->metadata has no partition, then no rule in 'cls' has an
+ * exact-match for flow->metadata. That means that we don't need to
+ * search any subtable that includes flow->metadata in its mask.
+ *
+ * In either case, we always need to search any cls_subtables that do not
+ * include flow->metadata in its mask. One way to do that would be to
+ * check the "cls_subtable"s explicitly for that, but that would require an
+ * extra branch per subtable. Instead, we mark such a cls_subtable's
+ * 'tags' as TAG_ALL and make sure that 'tags' is never empty. This means
+ * that 'tags' always intersects such a cls_subtable's 'tags', so we don't
+ * need a special case.
+ */
+ partition = (hmap_is_empty(&cls->partitions)
+ ? NULL
+ : find_partition(cls, flow->metadata,
+ hash_metadata(flow->metadata)));
+ tags = partition ? partition->tags : TAG_ARBITRARY;
best = NULL;
- HMAP_FOR_EACH (table, hmap_node, &cls->tables) {
- struct cls_rule *rule = find_match(table, flow);
- if (rule && (!best || rule->priority > best->priority)) {
+ LIST_FOR_EACH (subtable, list_node, &cls->subtables_priority) {
+ struct cls_rule *rule;
+
+ if (!tag_intersects(tags, subtable->tag)) {
+ continue;
+ }
+
+ rule = find_match_wc(subtable, flow, wc);
+ if (rule) {
best = rule;
+ LIST_FOR_EACH_CONTINUE (subtable, list_node,
+ &cls->subtables_priority) {
+ if (subtable->max_priority <= best->priority) {
+ /* Subtables are in descending priority order,
+ * can not find anything better. */
+ return best;
+ }
+ if (!tag_intersects(tags, subtable->tag)) {
+ continue;
+ }
+
+ rule = find_match_wc(subtable, flow, wc);
+ if (rule && rule->priority > best->priority) {
+ best = rule;
+ }
+ }
+ break;
}
}
return best;
const struct cls_rule *target)
{
struct cls_rule *head, *rule;
- struct cls_table *table;
+ struct cls_subtable *subtable;
+
+ subtable = find_subtable(cls, &target->match.mask);
+ if (!subtable) {
+ return NULL;
+ }
- table = find_table(cls, &target->match.mask);
- if (!table) {
+ /* Skip if there is no hope. */
+ if (target->priority > subtable->max_priority) {
return NULL;
}
- head = find_equal(table, &target->match.flow,
+ head = find_equal(subtable, &target->match.flow,
miniflow_hash_in_minimask(&target->match.flow,
&target->match.mask, 0));
FOR_EACH_RULE_IN_LIST (rule, head) {
classifier_rule_overlaps(const struct classifier *cls,
const struct cls_rule *target)
{
- struct cls_table *table;
+ struct cls_subtable *subtable;
- HMAP_FOR_EACH (table, hmap_node, &cls->tables) {
+ /* Iterate subtables in the descending max priority order. */
+ LIST_FOR_EACH (subtable, list_node, &cls->subtables_priority) {
uint32_t storage[FLOW_U32S];
struct minimask mask;
struct cls_rule *head;
- minimask_combine(&mask, &target->match.mask, &table->mask, storage);
- HMAP_FOR_EACH (head, hmap_node, &table->rules) {
+ if (target->priority > subtable->max_priority) {
+ break; /* Can skip this and the rest of the subtables. */
+ }
+
+ minimask_combine(&mask, &target->match.mask, &subtable->mask, storage);
+ HMAP_FOR_EACH (head, hmap_node, &subtable->rules) {
struct cls_rule *rule;
FOR_EACH_RULE_IN_LIST (rule, head) {
+ if (rule->priority < target->priority) {
+ break; /* Rules in descending priority order. */
+ }
if (rule->priority == target->priority
&& miniflow_equal_in_minimask(&target->match.flow,
&rule->match.flow, &mask)) {
}
static struct cls_rule *
-search_table(const struct cls_table *table, const struct cls_rule *target)
+search_subtable(const struct cls_subtable *subtable,
+ const struct cls_rule *target)
{
- if (!target || !minimask_has_extra(&table->mask, &target->match.mask)) {
+ if (!target || !minimask_has_extra(&subtable->mask, &target->match.mask)) {
struct cls_rule *rule;
- HMAP_FOR_EACH (rule, hmap_node, &table->rules) {
+ HMAP_FOR_EACH (rule, hmap_node, &subtable->rules) {
if (rule_matches(rule, target)) {
return rule;
}
struct cls_rule *
cls_cursor_first(struct cls_cursor *cursor)
{
- struct cls_table *table;
+ struct cls_subtable *subtable;
- HMAP_FOR_EACH (table, hmap_node, &cursor->cls->tables) {
- struct cls_rule *rule = search_table(table, cursor->target);
+ HMAP_FOR_EACH (subtable, hmap_node, &cursor->cls->subtables) {
+ struct cls_rule *rule = search_subtable(subtable, cursor->target);
if (rule) {
- cursor->table = table;
+ cursor->subtable = subtable;
return 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_)
{
- const struct cls_table *table;
+ struct cls_rule *rule = CONST_CAST(struct cls_rule *, rule_);
+ const struct cls_subtable *subtable;
struct cls_rule *next;
next = next_rule_in_list__(rule);
}
/* 'next' is the head of the list, that is, the rule that is included in
- * the table's hmap. (This is important when the classifier contains rules
- * that differ only in priority.) */
+ * the subtable's hmap. (This is important when the classifier contains
+ * rules that differ only in priority.) */
rule = next;
- HMAP_FOR_EACH_CONTINUE (rule, hmap_node, &cursor->table->rules) {
+ HMAP_FOR_EACH_CONTINUE (rule, hmap_node, &cursor->subtable->rules) {
if (rule_matches(rule, cursor->target)) {
return rule;
}
}
- table = cursor->table;
- HMAP_FOR_EACH_CONTINUE (table, hmap_node, &cursor->cls->tables) {
- rule = search_table(table, cursor->target);
+ subtable = cursor->subtable;
+ HMAP_FOR_EACH_CONTINUE (subtable, hmap_node, &cursor->cls->subtables) {
+ rule = search_subtable(subtable, cursor->target);
if (rule) {
- cursor->table = table;
+ cursor->subtable = subtable;
return rule;
}
}
return NULL;
}
\f
-static struct cls_table *
-find_table(const struct classifier *cls, const struct minimask *mask)
+static struct cls_subtable *
+find_subtable(const struct classifier *cls, const struct minimask *mask)
{
- struct cls_table *table;
+ struct cls_subtable *subtable;
- HMAP_FOR_EACH_IN_BUCKET (table, hmap_node, minimask_hash(mask, 0),
- &cls->tables) {
- if (minimask_equal(mask, &table->mask)) {
- return table;
+ HMAP_FOR_EACH_IN_BUCKET (subtable, hmap_node, minimask_hash(mask, 0),
+ &cls->subtables) {
+ if (minimask_equal(mask, &subtable->mask)) {
+ return subtable;
}
}
return NULL;
}
-static struct cls_table *
-insert_table(struct classifier *cls, const struct minimask *mask)
+static struct cls_subtable *
+insert_subtable(struct classifier *cls, const struct minimask *mask)
+{
+ uint32_t hash = minimask_hash(mask, 0);
+ struct cls_subtable *subtable;
+ int i, index = 0;
+ struct flow_wildcards old, new;
+ uint8_t prev;
+
+ subtable = xzalloc(sizeof *subtable);
+ hmap_init(&subtable->rules);
+ minimask_clone(&subtable->mask, mask);
+
+ /* Init indices for segmented lookup, if any. */
+ flow_wildcards_init_catchall(&new);
+ old = new;
+ prev = 0;
+ for (i = 0; i < cls->n_flow_segments; i++) {
+ flow_wildcards_fold_minimask_range(&new, mask, prev,
+ cls->flow_segments[i]);
+ /* Add an index if it adds mask bits. */
+ if (!flow_wildcards_equal(&new, &old)) {
+ hindex_init(&subtable->indices[index]);
+ subtable->index_ofs[index] = cls->flow_segments[i];
+ index++;
+ old = new;
+ }
+ prev = cls->flow_segments[i];
+ }
+ /* Check if the rest of the subtable's mask adds any bits,
+ * and remove the last index if it doesn't. */
+ if (index > 0) {
+ flow_wildcards_fold_minimask_range(&new, mask, prev, FLOW_U32S);
+ if (flow_wildcards_equal(&new, &old)) {
+ --index;
+ subtable->index_ofs[index] = 0;
+ hindex_destroy(&subtable->indices[index]);
+ }
+ }
+ subtable->n_indices = index;
+
+ hmap_insert(&cls->subtables, &subtable->hmap_node, hash);
+ list_push_back(&cls->subtables_priority, &subtable->list_node);
+ subtable->tag = (minimask_get_metadata_mask(mask) == OVS_BE64_MAX
+ ? tag_create_deterministic(hash)
+ : TAG_ALL);
+
+ return subtable;
+}
+
+static void
+destroy_subtable(struct classifier *cls, struct cls_subtable *subtable)
{
- struct cls_table *table;
+ int i;
- table = xzalloc(sizeof *table);
- hmap_init(&table->rules);
- minimask_clone(&table->mask, mask);
- hmap_insert(&cls->tables, &table->hmap_node, minimask_hash(mask, 0));
+ for (i = 0; i < subtable->n_indices; i++) {
+ hindex_destroy(&subtable->indices[i]);
+ }
+ minimask_destroy(&subtable->mask);
+ hmap_remove(&cls->subtables, &subtable->hmap_node);
+ hmap_destroy(&subtable->rules);
+ list_remove(&subtable->list_node);
+ free(subtable);
+}
+
+/* This function performs the following updates for 'subtable' in 'cls'
+ * following the addition of a new rule with priority 'new_priority' to
+ * 'subtable':
+ *
+ * - Update 'subtable->max_priority' and 'subtable->max_count' if necessary.
+ *
+ * - Update 'subtable''s position in 'cls->subtables_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_subtables_after_insertion(struct classifier *cls,
+ struct cls_subtable *subtable,
+ unsigned int new_priority)
+{
+ if (new_priority == subtable->max_priority) {
+ ++subtable->max_count;
+ } else if (new_priority > subtable->max_priority) {
+ struct cls_subtable *iter;
+
+ subtable->max_priority = new_priority;
+ subtable->max_count = 1;
+
+ /* Possibly move 'subtable' earlier in the priority list. If we break
+ * out of the loop, then 'subtable' should be moved just after that
+ * 'iter'. If the loop terminates normally, then 'iter' will be the
+ * list head and we'll move subtable just after that (e.g. to the front
+ * of the list). */
+ iter = subtable;
+ LIST_FOR_EACH_REVERSE_CONTINUE (iter, list_node,
+ &cls->subtables_priority) {
+ if (iter->max_priority >= subtable->max_priority) {
+ break;
+ }
+ }
- return table;
+ /* Move 'subtable' just after 'iter' (unless it's already there). */
+ if (iter->list_node.next != &subtable->list_node) {
+ list_splice(iter->list_node.next,
+ &subtable->list_node, subtable->list_node.next);
+ }
+ }
}
+/* This function performs the following updates for 'subtable' in 'cls'
+ * following the deletion of a rule with priority 'del_priority' from
+ * 'subtable':
+ *
+ * - Update 'subtable->max_priority' and 'subtable->max_count' if necessary.
+ *
+ * - Update 'subtable''s position in 'cls->subtables_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
-destroy_table(struct classifier *cls, struct cls_table *table)
+update_subtables_after_removal(struct classifier *cls,
+ struct cls_subtable *subtable,
+ unsigned int del_priority)
{
- minimask_destroy(&table->mask);
- hmap_remove(&cls->tables, &table->hmap_node);
- hmap_destroy(&table->rules);
- free(table);
+ struct cls_subtable *iter;
+
+ if (del_priority == subtable->max_priority && --subtable->max_count == 0) {
+ struct cls_rule *head;
+
+ subtable->max_priority = 0;
+ HMAP_FOR_EACH (head, hmap_node, &subtable->rules) {
+ if (head->priority > subtable->max_priority) {
+ subtable->max_priority = head->priority;
+ subtable->max_count = 1;
+ } else if (head->priority == subtable->max_priority) {
+ ++subtable->max_count;
+ }
+ }
+
+ /* Possibly move 'subtable' later in the priority list. If we break
+ * out of the loop, then 'subtable' should be moved just before that
+ * 'iter'. If the loop terminates normally, then 'iter' will be the
+ * list head and we'll move subtable just before that (e.g. to the back
+ * of the list). */
+ iter = subtable;
+ LIST_FOR_EACH_CONTINUE (iter, list_node, &cls->subtables_priority) {
+ if (iter->max_priority <= subtable->max_priority) {
+ break;
+ }
+ }
+
+ /* Move 'subtable' just before 'iter' (unless it's already there). */
+ if (iter->list_node.prev != &subtable->list_node) {
+ list_splice(&iter->list_node,
+ &subtable->list_node, subtable->list_node.next);
+ }
+ }
}
-static struct cls_rule *
-find_match(const struct cls_table *table, const struct flow *flow)
+static inline struct cls_rule *
+find_match(const struct cls_subtable *subtable, const struct flow *flow,
+ uint32_t hash)
{
- uint32_t hash = flow_hash_in_minimask(flow, &table->mask, 0);
struct cls_rule *rule;
- HMAP_FOR_EACH_WITH_HASH (rule, hmap_node, hash, &table->rules) {
- if (miniflow_equal_flow_in_minimask(&rule->match.flow, flow,
- &table->mask)) {
+ HMAP_FOR_EACH_WITH_HASH (rule, hmap_node, hash, &subtable->rules) {
+ if (minimatch_matches_flow(&rule->match, flow)) {
return rule;
}
}
}
static struct cls_rule *
-find_equal(struct cls_table *table, const struct miniflow *flow, uint32_t hash)
+find_match_wc(const struct cls_subtable *subtable, const struct flow *flow,
+ struct flow_wildcards * wc)
+{
+ uint32_t basis = 0, hash;
+ struct cls_rule *rule = NULL;
+ uint8_t prev_u32ofs = 0;
+ int i;
+
+ if (!wc) {
+ return find_match(subtable, flow,
+ flow_hash_in_minimask(flow, &subtable->mask, 0));
+ }
+
+ /* Try to finish early by checking fields in segments. */
+ for (i = 0; i < subtable->n_indices; i++) {
+ struct hindex_node *inode;
+
+ hash = flow_hash_in_minimask_range(flow, &subtable->mask, prev_u32ofs,
+ subtable->index_ofs[i], &basis);
+ prev_u32ofs = subtable->index_ofs[i];
+ inode = hindex_node_with_hash(&subtable->indices[i], hash);
+ if (!inode) {
+ /* No match, can stop immediately, but must fold in the mask
+ * covered so far. */
+ flow_wildcards_fold_minimask_range(wc, &subtable->mask, 0,
+ prev_u32ofs);
+ return NULL;
+ }
+
+ /* If we have narrowed down to a single rule already, check whether
+ * that rule matches. If it does match, then we're done. If it does
+ * not match, then we know that we will never get a match, but we do
+ * not yet know how many wildcards we need to fold into 'wc' so we
+ * continue iterating through indices to find that out. (We won't
+ * waste time calling minimatch_matches_flow() again because we've set
+ * 'rule' nonnull.)
+ *
+ * This check shows a measurable benefit with non-trivial flow tables.
+ *
+ * (Rare) hash collisions may cause us to miss the opportunity for this
+ * optimization. */
+ if (!inode->s && !rule) {
+ ASSIGN_CONTAINER(rule, inode - i, index_nodes);
+ if (minimatch_matches_flow(&rule->match, flow)) {
+ goto out;
+ }
+ }
+ }
+
+ if (!rule) {
+ /* Multiple potential matches exist, look for one. */
+ hash = flow_hash_in_minimask_range(flow, &subtable->mask, prev_u32ofs,
+ FLOW_U32S, &basis);
+ rule = find_match(subtable, flow, hash);
+ } else {
+ /* We already narrowed the matching candidates down to just 'rule',
+ * but it didn't match. */
+ rule = NULL;
+ }
+ out:
+ flow_wildcards_fold_minimask(wc, &subtable->mask);
+ return rule;
+}
+
+static struct cls_rule *
+find_equal(struct cls_subtable *subtable, const struct miniflow *flow,
+ uint32_t hash)
{
struct cls_rule *head;
- HMAP_FOR_EACH_WITH_HASH (head, hmap_node, hash, &table->rules) {
+ HMAP_FOR_EACH_WITH_HASH (head, hmap_node, hash, &subtable->rules) {
if (miniflow_equal(&head->match.flow, flow)) {
return head;
}
}
static struct cls_rule *
-insert_rule(struct cls_table *table, struct cls_rule *new)
+insert_rule(struct classifier *cls, struct cls_subtable *subtable,
+ struct cls_rule *new)
{
struct cls_rule *head;
-
- new->hmap_node.hash = miniflow_hash_in_minimask(&new->match.flow,
- &new->match.mask, 0);
-
- head = find_equal(table, &new->match.flow, new->hmap_node.hash);
+ struct cls_rule *old = NULL;
+ int i;
+ uint32_t basis = 0, hash;
+ uint8_t prev_u32ofs = 0;
+
+ /* Add new node to segment indices. */
+ for (i = 0; i < subtable->n_indices; i++) {
+ hash = minimatch_hash_range(&new->match, prev_u32ofs,
+ subtable->index_ofs[i], &basis);
+ hindex_insert(&subtable->indices[i], &new->index_nodes[i], hash);
+ prev_u32ofs = subtable->index_ofs[i];
+ }
+ hash = minimatch_hash_range(&new->match, prev_u32ofs, FLOW_U32S, &basis);
+ head = find_equal(subtable, &new->match.flow, hash);
if (!head) {
- hmap_insert(&table->rules, &new->hmap_node, new->hmap_node.hash);
+ hmap_insert(&subtable->rules, &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. */
struct cls_rule *rule;
+
+ new->hmap_node.hash = hash; /* Otherwise done by hmap_insert. */
+
FOR_EACH_RULE_IN_LIST (rule, head) {
if (new->priority >= rule->priority) {
if (rule == head) {
/* 'new' is the new highest-priority flow in the list. */
- hmap_replace(&table->rules,
+ hmap_replace(&subtable->rules,
&rule->hmap_node, &new->hmap_node);
}
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_subtables_after_insertion(cls, subtable, new->priority);
+ } else {
+ /* Remove old node from indices. */
+ for (i = 0; i < subtable->n_indices; i++) {
+ hindex_remove(&subtable->indices[i], &old->index_nodes[i]);
+ }
+ }
+ return old;
}
static struct cls_rule *
git://git.onelab.eu / sliver-openvswitch.git / blobdiff