/*
- * Copyright (c) 2009, 2010, 2011, 2012, 2013, 2014 Nicira, Inc.
+ * Copyright (c) 2009, 2010, 2011, 2012, 2013, 2014, 2015 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 "ofp-util.h"
#include "packets.h"
#include "util.h"
-#include "vlog.h"
+#include "openvswitch/vlog.h"
VLOG_DEFINE_THIS_MODULE(classifier);
struct trie_ctx;
+/* A collection of "struct cls_conjunction"s currently embedded into a
+ * cls_match. */
+struct cls_conjunction_set {
+ /* Link back to the cls_match.
+ *
+ * cls_conjunction_set is mostly used during classifier lookup, and, in
+ * turn, during classifier lookup the most used member of
+ * cls_conjunction_set is the rule's priority, so we cache it here for fast
+ * access. */
+ struct cls_match *match;
+ int priority; /* Cached copy of match->priority. */
+
+ /* Conjunction information.
+ *
+ * 'min_n_clauses' allows some optimization during classifier lookup. */
+ unsigned int n; /* Number of elements in 'conj'. */
+ unsigned int min_n_clauses; /* Smallest 'n' among elements of 'conj'. */
+ struct cls_conjunction conj[];
+};
+
/* Ports trie depends on both ports sharing the same ovs_be32. */
#define TP_PORTS_OFS32 (offsetof(struct flow, tp_src) / 4)
BUILD_ASSERT_DECL(TP_PORTS_OFS32 == offsetof(struct flow, tp_dst) / 4);
+BUILD_ASSERT_DECL(TP_PORTS_OFS32 % 2 == 0);
+#define TP_PORTS_OFS64 (TP_PORTS_OFS32 / 2)
+
+static size_t
+cls_conjunction_set_size(size_t n)
+{
+ return (sizeof(struct cls_conjunction_set)
+ + n * sizeof(struct cls_conjunction));
+}
+
+static struct cls_conjunction_set *
+cls_conjunction_set_alloc(struct cls_match *match,
+ const struct cls_conjunction conj[], size_t n)
+{
+ if (n) {
+ size_t min_n_clauses = conj[0].n_clauses;
+ for (size_t i = 1; i < n; i++) {
+ min_n_clauses = MIN(min_n_clauses, conj[i].n_clauses);
+ }
+
+ struct cls_conjunction_set *set = xmalloc(cls_conjunction_set_size(n));
+ set->match = match;
+ set->priority = match->priority;
+ set->n = n;
+ set->min_n_clauses = min_n_clauses;
+ memcpy(set->conj, conj, n * sizeof *conj);
+ return set;
+ } else {
+ return NULL;
+ }
+}
static struct cls_match *
-cls_match_alloc(struct cls_rule *rule)
+cls_match_alloc(const struct cls_rule *rule, cls_version_t version,
+ const struct cls_conjunction conj[], size_t n)
{
- int count = count_1bits(rule->match.flow.map);
+ size_t count = miniflow_n_values(rule->match.flow);
struct cls_match *cls_match
- = xmalloc(sizeof *cls_match - sizeof cls_match->flow.inline_values
- + MINIFLOW_VALUES_SIZE(count));
+ = xmalloc(sizeof *cls_match + MINIFLOW_VALUES_SIZE(count));
- rculist_init(&cls_match->list);
+ ovsrcu_init(&cls_match->next, NULL);
*CONST_CAST(const struct cls_rule **, &cls_match->cls_rule) = rule;
*CONST_CAST(int *, &cls_match->priority) = rule->priority;
- miniflow_clone_inline(CONST_CAST(struct miniflow *, &cls_match->flow),
- &rule->match.flow, count);
+ *CONST_CAST(cls_version_t *, &cls_match->add_version) = version;
+ atomic_init(&cls_match->remove_version, version); /* Initially
+ * invisible. */
+ miniflow_clone(CONST_CAST(struct miniflow *, &cls_match->flow),
+ rule->match.flow, count);
+ ovsrcu_set_hidden(&cls_match->conj_set,
+ cls_conjunction_set_alloc(cls_match, conj, n));
return cls_match;
}
static void destroy_subtable(struct classifier *cls, struct cls_subtable *);
static const struct cls_match *find_match_wc(const struct cls_subtable *,
+ cls_version_t version,
const struct flow *,
struct trie_ctx *,
unsigned int n_tries,
static struct cls_match *find_equal(const struct cls_subtable *,
const struct miniflow *, uint32_t hash);
+/* Return the next visible (lower-priority) rule in the list. Multiple
+ * identical rules with the same priority may exist transitionally, but when
+ * versioning is used at most one of them is ever visible for lookups on any
+ * given 'version'. */
static inline const struct cls_match *
-next_rule_in_list__(const struct cls_match *rule)
-{
- const struct cls_match *next = NULL;
- next = OBJECT_CONTAINING(rculist_next(&rule->list), next, list);
- return next;
-}
-
-static inline const struct cls_match *
-next_rule_in_list(const struct cls_match *rule)
+next_visible_rule_in_list(const struct cls_match *rule, cls_version_t version)
{
- const struct cls_match *next = next_rule_in_list__(rule);
- return next->priority < rule->priority ? next : NULL;
-}
+ do {
+ rule = cls_match_next(rule);
+ } while (rule && !cls_match_visible_in_version(rule, version));
-static inline struct cls_match *
-next_rule_in_list_protected__(struct cls_match *rule)
-{
- struct cls_match *next = NULL;
- next = OBJECT_CONTAINING(rculist_next_protected(&rule->list), next, list);
- return next;
-}
-
-static inline struct cls_match *
-next_rule_in_list_protected(struct cls_match *rule)
-{
- struct cls_match *next = next_rule_in_list_protected__(rule);
- return next->priority < rule->priority ? next : NULL;
+ return rule;
}
-/* Iterates RULE over HEAD and all of the cls_rules on HEAD->list. */
-#define FOR_EACH_RULE_IN_LIST(RULE, HEAD) \
- for ((RULE) = (HEAD); (RULE) != NULL; (RULE) = next_rule_in_list(RULE))
-#define FOR_EACH_RULE_IN_LIST_PROTECTED(RULE, HEAD) \
- for ((RULE) = (HEAD); (RULE) != NULL; \
- (RULE) = next_rule_in_list_protected(RULE))
+/* Type with maximum supported prefix length. */
+union trie_prefix {
+ struct in6_addr ipv6; /* For sizing. */
+ ovs_be32 be32; /* For access. */
+};
static unsigned int minimask_get_prefix_len(const struct minimask *,
const struct mf_field *);
static void trie_init(struct classifier *cls, int trie_idx,
const struct mf_field *);
static unsigned int trie_lookup(const struct cls_trie *, const struct flow *,
- union mf_value *plens);
+ union trie_prefix *plens);
static unsigned int trie_lookup_value(const rcu_trie_ptr *,
const ovs_be32 value[], ovs_be32 plens[],
unsigned int value_bits);
cls_rule_init__(struct cls_rule *rule, unsigned int priority)
{
rculist_init(&rule->node);
- rule->priority = priority;
+ *CONST_CAST(int *, &rule->priority) = priority;
rule->cls_match = NULL;
}
cls_rule_init(struct cls_rule *rule, const struct match *match, int priority)
{
cls_rule_init__(rule, priority);
- minimatch_init(&rule->match, match);
+ minimatch_init(CONST_CAST(struct minimatch *, &rule->match), match);
}
/* Same as cls_rule_init() for initialization from a "struct minimatch". */
const struct minimatch *match, int priority)
{
cls_rule_init__(rule, priority);
- minimatch_clone(&rule->match, match);
+ minimatch_clone(CONST_CAST(struct minimatch *, &rule->match), match);
}
/* Initializes 'dst' as a copy of 'src'.
cls_rule_clone(struct cls_rule *dst, const struct cls_rule *src)
{
cls_rule_init__(dst, src->priority);
- minimatch_clone(&dst->match, &src->match);
+ minimatch_clone(CONST_CAST(struct minimatch *, &dst->match), &src->match);
}
/* Initializes 'dst' with the data in 'src', destroying 'src'.
+ *
* 'src' must be a cls_rule NOT in a classifier.
*
* The caller must eventually destroy 'dst' with cls_rule_destroy(). */
void
cls_rule_move(struct cls_rule *dst, struct cls_rule *src)
{
- ovs_assert(!src->cls_match); /* Must not be in a classifier. */
cls_rule_init__(dst, src->priority);
- minimatch_move(&dst->match, &src->match);
+ minimatch_move(CONST_CAST(struct minimatch *, &dst->match),
+ CONST_CAST(struct minimatch *, &src->match));
}
/* Frees memory referenced by 'rule'. Doesn't free 'rule' itself (it's
* ('rule' must not currently be in a classifier.) */
void
cls_rule_destroy(struct cls_rule *rule)
+ OVS_NO_THREAD_SAFETY_ANALYSIS
{
ovs_assert(!rule->cls_match); /* Must not be in a classifier. */
- /* Check that the rule has been properly removed from the classifier and
- * that the destruction only happens after the RCU grace period, or that
- * the rule was never inserted to the classifier in the first place. */
- ovs_assert(rculist_next_protected(&rule->node) == RCULIST_POISON
+ /* Check that the rule has been properly removed from the classifier. */
+ ovs_assert(rule->node.prev == RCULIST_POISON
|| rculist_is_empty(&rule->node));
+ rculist_poison__(&rule->node); /* Poisons also the next pointer. */
+
+ minimatch_destroy(CONST_CAST(struct minimatch *, &rule->match));
+}
- minimatch_destroy(&rule->match);
+void
+cls_rule_set_conjunctions(struct cls_rule *cr,
+ const struct cls_conjunction *conj, size_t n)
+{
+ struct cls_match *match = cr->cls_match;
+ struct cls_conjunction_set *old
+ = ovsrcu_get_protected(struct cls_conjunction_set *, &match->conj_set);
+ struct cls_conjunction *old_conj = old ? old->conj : NULL;
+ unsigned int old_n = old ? old->n : 0;
+
+ if (old_n != n || (n && memcmp(old_conj, conj, n * sizeof *conj))) {
+ if (old) {
+ ovsrcu_postpone(free, old);
+ }
+ ovsrcu_set(&match->conj_set,
+ cls_conjunction_set_alloc(match, conj, n));
+ }
}
+
/* Returns true if 'a' and 'b' match the same packets at the same priority,
* false if they differ in some way. */
bool
return a->priority == b->priority && minimatch_equal(&a->match, &b->match);
}
-/* Returns a hash value for 'rule', folding in 'basis'. */
-uint32_t
-cls_rule_hash(const struct cls_rule *rule, uint32_t basis)
-{
- return minimatch_hash(&rule->match, hash_int(rule->priority, basis));
-}
-
/* Appends a string describing 'rule' to 's'. */
void
cls_rule_format(const struct cls_rule *rule, struct ds *s)
bool
cls_rule_is_catchall(const struct cls_rule *rule)
{
- return minimask_is_catchall(&rule->match.mask);
+ return minimask_is_catchall(rule->match.mask);
+}
+
+/* Makes 'rule' invisible in 'remove_version'. Once that version is used in
+ * lookups, the caller should remove 'rule' via ovsrcu_postpone().
+ *
+ * 'rule' must be in a classifier. */
+void
+cls_rule_make_invisible_in_version(const struct cls_rule *rule,
+ cls_version_t remove_version)
+{
+ ovs_assert(remove_version >= rule->cls_match->add_version);
+
+ cls_match_set_remove_version(rule->cls_match, remove_version);
+}
+
+/* This undoes the change made by cls_rule_make_invisible_in_version().
+ *
+ * 'rule' must be in a classifier. */
+void
+cls_rule_restore_visibility(const struct cls_rule *rule)
+{
+ cls_match_set_remove_version(rule->cls_match, CLS_NOT_REMOVED_VERSION);
+}
+
+/* Return true if 'rule' is visible in 'version'.
+ *
+ * 'rule' must be in a classifier. */
+bool
+cls_rule_visible_in_version(const struct cls_rule *rule, cls_version_t version)
+{
+ return cls_match_visible_in_version(rule->cls_match, version);
}
\f
/* Initializes 'cls' as a classifier that initially contains no classification
cls->n_rules = 0;
cmap_init(&cls->subtables_map);
pvector_init(&cls->subtables);
- cmap_init(&cls->partitions);
cls->n_flow_segments = 0;
if (flow_segments) {
while (cls->n_flow_segments < CLS_MAX_INDICES
- && *flow_segments < FLOW_U32S) {
+ && *flow_segments < FLOW_U64S) {
cls->flow_segments[cls->n_flow_segments++] = *flow_segments++;
}
}
for (int i = 0; i < CLS_MAX_TRIES; i++) {
trie_init(cls, i, NULL);
}
+ cls->publish = true;
}
/* Destroys 'cls'. Rules within 'cls', if any, are not freed; this is the
classifier_destroy(struct classifier *cls)
{
if (cls) {
- struct cls_partition *partition;
struct cls_subtable *subtable;
int i;
}
cmap_destroy(&cls->subtables_map);
- CMAP_FOR_EACH (partition, cmap_node, &cls->partitions) {
- ovsrcu_postpone(free, partition);
- }
- cmap_destroy(&cls->partitions);
-
pvector_destroy(&cls->subtables);
}
}
return cls->n_rules;
}
-static uint32_t
-hash_metadata(ovs_be64 metadata_)
-{
- uint64_t metadata = (OVS_FORCE uint64_t) metadata_;
- return hash_uint64(metadata);
-}
-
-static struct cls_partition *
-find_partition(const struct classifier *cls, ovs_be64 metadata, uint32_t hash)
-{
- struct cls_partition *partition;
-
- CMAP_FOR_EACH_WITH_HASH (partition, cmap_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);
- cmap_insert(&cls->partitions, &partition->cmap_node, hash);
- }
- tag_tracker_add(&partition->tracker, &partition->tags, subtable->tag);
- return partition;
-}
-
static inline ovs_be32 minimatch_get_ports(const struct minimatch *match)
{
/* Could optimize to use the same map if needed for fast path. */
- return MINIFLOW_GET_BE32(&match->flow, tp_src)
- & MINIFLOW_GET_BE32(&match->mask.masks, tp_src);
+ return MINIFLOW_GET_BE32(match->flow, tp_src)
+ & MINIFLOW_GET_BE32(&match->mask->masks, tp_src);
}
static void
{
/* Rule's data is already in the tries. */
- new->partition = head->partition; /* Steal partition, if any. */
- head->partition = NULL;
-
for (int i = 0; i < subtable->n_indices; i++) {
cmap_replace(&subtable->indices[i], &head->index_nodes[i],
&new->index_nodes[i], ihash[i]);
cmap_replace(&subtable->rules, &head->cmap_node, &new->cmap_node, hash);
}
-/* Inserts 'rule' into 'cls'. Until 'rule' is removed from 'cls', the caller
- * must not modify or free it.
+/* Inserts 'rule' into 'cls' in 'version'. Until 'rule' is removed from 'cls',
+ * the caller must not modify or free it.
*
* If 'cls' already contains an identical rule (including wildcards, values of
- * fixed fields, and priority), replaces the old rule by 'rule' and returns the
- * rule that was replaced. The caller takes ownership of the returned rule and
- * is thus responsible for destroying it with cls_rule_destroy(), after RCU
- * grace period has passed (see ovsrcu_postpone()).
+ * fixed fields, and priority) that is visible in 'version', replaces the old
+ * rule by 'rule' and returns the rule that was replaced. The caller takes
+ * ownership of the returned rule and is thus responsible for destroying it
+ * with cls_rule_destroy(), after RCU grace period has passed (see
+ * ovsrcu_postpone()).
*
* Returns NULL if 'cls' does not contain a rule with an identical key, after
* inserting the new rule. In this case, no rules are displaced by the new
* superset of their flows and has higher priority.
*/
const struct cls_rule *
-classifier_replace(struct classifier *cls, struct cls_rule *rule)
+classifier_replace(struct classifier *cls, const struct cls_rule *rule,
+ cls_version_t version,
+ const struct cls_conjunction *conjs, size_t n_conjs)
{
- struct cls_match *new = cls_match_alloc(rule);
+ struct cls_match *new;
struct cls_subtable *subtable;
uint32_t ihash[CLS_MAX_INDICES];
- uint8_t prev_be32ofs = 0;
struct cls_match *head;
+ unsigned int mask_offset;
size_t n_rules = 0;
uint32_t basis;
uint32_t hash;
- int i;
+ unsigned int i;
- rule->cls_match = new;
+ /* 'new' is initially invisible to lookups. */
+ new = cls_match_alloc(rule, version, conjs, n_conjs);
- subtable = find_subtable(cls, &rule->match.mask);
+ CONST_CAST(struct cls_rule *, rule)->cls_match = new;
+
+ subtable = find_subtable(cls, rule->match.mask);
if (!subtable) {
- subtable = insert_subtable(cls, &rule->match.mask);
+ subtable = insert_subtable(cls, rule->match.mask);
}
/* Compute hashes in segments. */
basis = 0;
+ mask_offset = 0;
for (i = 0; i < subtable->n_indices; i++) {
- ihash[i] = minimatch_hash_range(&rule->match, prev_be32ofs,
- subtable->index_ofs[i], &basis);
- prev_be32ofs = subtable->index_ofs[i];
+ ihash[i] = minimatch_hash_range(&rule->match, subtable->index_maps[i],
+ &mask_offset, &basis);
}
- hash = minimatch_hash_range(&rule->match, prev_be32ofs, FLOW_U32S, &basis);
+ hash = minimatch_hash_range(&rule->match, subtable->index_maps[i],
+ &mask_offset, &basis);
- head = find_equal(subtable, &rule->match.flow, hash);
+ head = find_equal(subtable, rule->match.flow, hash);
if (!head) {
/* Add rule to tries.
*
subtable->ports_mask_len);
}
- /* Add rule to partitions.
- *
- * Concurrent readers might miss seeing the rule until this update,
- * which might require being fixed up by revalidation later. */
- new->partition = NULL;
- if (minimask_get_metadata_mask(&rule->match.mask) == OVS_BE64_MAX) {
- ovs_be64 metadata = miniflow_get_metadata(&rule->match.flow);
-
- new->partition = create_partition(cls, subtable, metadata);
- }
-
- /* Make rule visible to lookups. */
-
/* Add new node to segment indices.
*
* Readers may find the rule in the indices before the rule is visible
}
n_rules = cmap_insert(&subtable->rules, &new->cmap_node, hash);
} else { /* Equal rules exist in the classifier already. */
- struct cls_match *iter;
+ struct cls_match *prev, *iter;
/* Scan the list for the insertion point that will keep the list in
- * order of decreasing priority. */
- FOR_EACH_RULE_IN_LIST_PROTECTED (iter, head) {
- if (rule->priority >= iter->priority) {
+ * order of decreasing priority. Insert after rules marked invisible
+ * in any version of the same priority. */
+ FOR_EACH_RULE_IN_LIST_PROTECTED (iter, prev, head) {
+ if (rule->priority > iter->priority
+ || (rule->priority == iter->priority
+ && !cls_match_is_eventually_invisible(iter))) {
break;
}
}
- /* 'iter' now at the insertion point or NULL it at end. */
+ /* Replace 'iter' with 'new' or insert 'new' between 'prev' and
+ * 'iter'. */
if (iter) {
struct cls_rule *old;
if (rule->priority == iter->priority) {
- rculist_replace(&new->list, &iter->list);
+ cls_match_replace(prev, iter, new);
old = CONST_CAST(struct cls_rule *, iter->cls_rule);
} else {
- rculist_insert(&iter->list, &new->list);
+ cls_match_insert(prev, iter, new);
old = NULL;
}
}
if (old) {
- ovsrcu_postpone(free, iter);
+ struct cls_conjunction_set *conj_set;
+
+ conj_set = ovsrcu_get_protected(struct cls_conjunction_set *,
+ &iter->conj_set);
+ if (conj_set) {
+ ovsrcu_postpone(free, conj_set);
+ }
+
+ ovsrcu_postpone(cls_match_free_cb, iter);
old->cls_match = NULL;
/* No change in subtable's max priority or max count. */
- /* Make rule visible to iterators. */
- rculist_replace(&rule->node, &old->node);
+ /* Make 'new' visible to lookups in the appropriate version. */
+ cls_match_set_remove_version(new, CLS_NOT_REMOVED_VERSION);
+
+ /* Make rule visible to iterators (immediately). */
+ rculist_replace(CONST_CAST(struct rculist *, &rule->node),
+ &old->node);
/* Return displaced rule. Caller is responsible for keeping it
* around until all threads quiesce. */
return old;
}
} else {
- rculist_push_back(&head->list, &new->list);
+ /* 'new' is new node after 'prev' */
+ cls_match_insert(prev, iter, new);
}
}
- /* Make rule visible to iterators. */
- rculist_push_back(&subtable->rules_list, &rule->node);
+ /* Make 'new' visible to lookups in the appropriate version. */
+ cls_match_set_remove_version(new, CLS_NOT_REMOVED_VERSION);
+
+ /* Make rule visible to iterators (immediately). */
+ rculist_push_back(&subtable->rules_list,
+ CONST_CAST(struct rculist *, &rule->node));
/* Rule was added, not replaced. Update 'subtable's 'max_priority' and
* 'max_count', if necessary.
/* Nothing was replaced. */
cls->n_rules++;
+
+ if (cls->publish) {
+ pvector_publish(&cls->subtables);
+ }
+
return NULL;
}
* fixed fields, and priority). Use classifier_find_rule_exactly() to find
* such a rule. */
void
-classifier_insert(struct classifier *cls, struct cls_rule *rule)
+classifier_insert(struct classifier *cls, const struct cls_rule *rule,
+ cls_version_t version, const struct cls_conjunction conj[],
+ size_t n_conj)
{
- const struct cls_rule *displaced_rule = classifier_replace(cls, rule);
+ const struct cls_rule *displaced_rule
+ = classifier_replace(cls, rule, version, conj, n_conj);
ovs_assert(!displaced_rule);
}
* Returns the removed rule, or NULL, if it was already removed.
*/
const struct cls_rule *
-classifier_remove(struct classifier *cls, const struct cls_rule *rule)
+classifier_remove(struct classifier *cls, const struct cls_rule *cls_rule)
{
- struct cls_partition *partition;
- struct cls_match *cls_match;
+ struct cls_match *rule, *prev, *next, *head;
+ struct cls_conjunction_set *conj_set;
struct cls_subtable *subtable;
- struct cls_match *prev;
- struct cls_match *next;
- int i;
uint32_t basis = 0, hash, ihash[CLS_MAX_INDICES];
- uint8_t prev_be32ofs = 0;
+ unsigned int mask_offset;
size_t n_rules;
+ unsigned int i;
- cls_match = rule->cls_match;
- if (!cls_match) {
+ rule = cls_rule->cls_match;
+ if (!rule) {
return NULL;
}
/* Mark as removed. */
- CONST_CAST(struct cls_rule *, rule)->cls_match = NULL;
+ CONST_CAST(struct cls_rule *, cls_rule)->cls_match = NULL;
- /* Remove 'rule' from the subtable's rules list. */
- rculist_remove(&CONST_CAST(struct cls_rule *, rule)->node);
+ /* Remove 'cls_rule' from the subtable's rules list. */
+ rculist_remove(CONST_CAST(struct rculist *, &cls_rule->node));
- INIT_CONTAINER(prev, rculist_back_protected(&cls_match->list), list);
- INIT_CONTAINER(next, rculist_next(&cls_match->list), list);
-
- /* Remove from the list of equal rules. */
- rculist_remove(&cls_match->list);
+ subtable = find_subtable(cls, cls_rule->match.mask);
+ ovs_assert(subtable);
- /* Check if this is NOT a head rule. */
- if (prev->priority > rule->priority) {
- /* Not the highest priority rule, no need to check subtable's
- * 'max_priority'. */
- goto free;
+ mask_offset = 0;
+ for (i = 0; i < subtable->n_indices; i++) {
+ ihash[i] = minimatch_hash_range(&cls_rule->match,
+ subtable->index_maps[i],
+ &mask_offset, &basis);
}
+ hash = minimatch_hash_range(&cls_rule->match, subtable->index_maps[i],
+ &mask_offset, &basis);
- subtable = find_subtable(cls, &rule->match.mask);
- ovs_assert(subtable);
+ head = find_equal(subtable, cls_rule->match.flow, hash);
- for (i = 0; i < subtable->n_indices; i++) {
- ihash[i] = minimatch_hash_range(&rule->match, prev_be32ofs,
- subtable->index_ofs[i], &basis);
- prev_be32ofs = subtable->index_ofs[i];
+ /* Check if the rule is not the head rule. */
+ if (rule != head) {
+ struct cls_match *iter;
+
+ /* Not the head rule, but potentially one with the same priority. */
+ /* Remove from the list of equal rules. */
+ FOR_EACH_RULE_IN_LIST_PROTECTED (iter, prev, head) {
+ if (rule == iter) {
+ break;
+ }
+ }
+ ovs_assert(iter == rule);
+
+ cls_match_remove(prev, rule);
+
+ goto check_priority;
}
- hash = minimatch_hash_range(&rule->match, prev_be32ofs, FLOW_U32S, &basis);
- /* Head rule. Check if 'next' is an identical, lower-priority rule that
- * will replace 'rule' in the data structures. */
- if (next->priority < rule->priority) {
- subtable_replace_head_rule(cls, subtable, cls_match, next, hash,
- ihash);
+ /* 'rule' is the head rule. Check if there is another rule to
+ * replace 'rule' in the data structures. */
+ next = cls_match_next_protected(rule);
+ if (next) {
+ subtable_replace_head_rule(cls, subtable, rule, next, hash, ihash);
goto check_priority;
}
* data structures. */
if (subtable->ports_mask_len) {
- ovs_be32 masked_ports = minimatch_get_ports(&rule->match);
+ ovs_be32 masked_ports = minimatch_get_ports(&cls_rule->match);
trie_remove_prefix(&subtable->ports_trie,
&masked_ports, subtable->ports_mask_len);
}
for (i = 0; i < cls->n_tries; i++) {
if (subtable->trie_plen[i]) {
- trie_remove(&cls->tries[i], rule, subtable->trie_plen[i]);
+ trie_remove(&cls->tries[i], cls_rule, subtable->trie_plen[i]);
}
}
/* Remove rule node from indices. */
for (i = 0; i < subtable->n_indices; i++) {
- cmap_remove(&subtable->indices[i], &cls_match->index_nodes[i],
- ihash[i]);
- }
- n_rules = cmap_remove(&subtable->rules, &cls_match->cmap_node, hash);
-
- partition = cls_match->partition;
- if (partition) {
- tag_tracker_subtract(&partition->tracker, &partition->tags,
- subtable->tag);
- if (!partition->tags) {
- cmap_remove(&cls->partitions, &partition->cmap_node,
- hash_metadata(partition->metadata));
- ovsrcu_postpone(free, partition);
- }
+ cmap_remove(&subtable->indices[i], &rule->index_nodes[i], ihash[i]);
}
+ n_rules = cmap_remove(&subtable->rules, &rule->cmap_node, hash);
if (n_rules == 0) {
destroy_subtable(cls, subtable);
if (subtable->max_priority == rule->priority
&& --subtable->max_count == 0) {
/* Find the new 'max_priority' and 'max_count'. */
- struct cls_match *head;
int max_priority = INT_MIN;
+ struct cls_match *head;
CMAP_FOR_EACH (head, cmap_node, &subtable->rules) {
if (head->priority > max_priority) {
pvector_change_priority(&cls->subtables, subtable, max_priority);
}
}
-free:
- ovsrcu_postpone(free, cls_match);
+
+ if (cls->publish) {
+ pvector_publish(&cls->subtables);
+ }
+
+ /* free the rule. */
+ conj_set = ovsrcu_get_protected(struct cls_conjunction_set *,
+ &rule->conj_set);
+ if (conj_set) {
+ ovsrcu_postpone(free, conj_set);
+ }
+ ovsrcu_postpone(cls_match_free_cb, rule);
cls->n_rules--;
- return rule;
+ return cls_rule;
}
/* Prefix tree context. Valid when 'lookup_done' is true. Can skip all
bool lookup_done; /* Status of the lookup. */
uint8_t be32ofs; /* U32 offset of the field in question. */
unsigned int maskbits; /* Prefix length needed to avoid false matches. */
- union mf_value match_plens; /* Bitmask of prefix lengths with possible
- * matches. */
+ union trie_prefix match_plens; /* Bitmask of prefix lengths with possible
+ * matches. */
};
static void
ctx->lookup_done = false;
}
-/* 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.
+struct conjunctive_match {
+ struct hmap_node hmap_node;
+ uint32_t id;
+ uint64_t clauses;
+};
+
+static struct conjunctive_match *
+find_conjunctive_match__(struct hmap *matches, uint64_t id, uint32_t hash)
+{
+ struct conjunctive_match *m;
+
+ HMAP_FOR_EACH_IN_BUCKET (m, hmap_node, hash, matches) {
+ if (m->id == id) {
+ return m;
+ }
+ }
+ return NULL;
+}
+
+static bool
+find_conjunctive_match(const struct cls_conjunction_set *set,
+ unsigned int max_n_clauses, struct hmap *matches,
+ struct conjunctive_match *cm_stubs, size_t n_cm_stubs,
+ uint32_t *idp)
+{
+ const struct cls_conjunction *c;
+
+ if (max_n_clauses < set->min_n_clauses) {
+ return false;
+ }
+
+ for (c = set->conj; c < &set->conj[set->n]; c++) {
+ struct conjunctive_match *cm;
+ uint32_t hash;
+
+ if (c->n_clauses > max_n_clauses) {
+ continue;
+ }
+
+ hash = hash_int(c->id, 0);
+ cm = find_conjunctive_match__(matches, c->id, hash);
+ if (!cm) {
+ size_t n = hmap_count(matches);
+
+ cm = n < n_cm_stubs ? &cm_stubs[n] : xmalloc(sizeof *cm);
+ hmap_insert(matches, &cm->hmap_node, hash);
+ cm->id = c->id;
+ cm->clauses = UINT64_MAX << (c->n_clauses & 63);
+ }
+ cm->clauses |= UINT64_C(1) << c->clause;
+ if (cm->clauses == UINT64_MAX) {
+ *idp = cm->id;
+ return true;
+ }
+ }
+ return false;
+}
+
+static void
+free_conjunctive_matches(struct hmap *matches,
+ struct conjunctive_match *cm_stubs, size_t n_cm_stubs)
+{
+ if (hmap_count(matches) > n_cm_stubs) {
+ struct conjunctive_match *cm, *next;
+
+ HMAP_FOR_EACH_SAFE (cm, next, hmap_node, matches) {
+ if (!(cm >= cm_stubs && cm < &cm_stubs[n_cm_stubs])) {
+ free(cm);
+ }
+ }
+ }
+ hmap_destroy(matches);
+}
+
+/* Like classifier_lookup(), except that support for conjunctive matches can be
+ * configured with 'allow_conjunctive_matches'. That feature is not exposed
+ * externally because turning off conjunctive matches is only useful to avoid
+ * recursion within this function itself.
*
- * 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()). */
-const struct cls_rule *
-classifier_lookup(const struct classifier *cls, const struct flow *flow,
- struct flow_wildcards *wc)
+ * 'flow' is non-const to allow for temporary modifications during the lookup.
+ * Any changes are restored before returning. */
+static const struct cls_rule *
+classifier_lookup__(const struct classifier *cls, cls_version_t version,
+ struct flow *flow, struct flow_wildcards *wc,
+ bool allow_conjunctive_matches)
{
- const struct cls_partition *partition;
- tag_type tags;
- int best_priority = INT_MIN;
- const struct cls_match *best;
struct trie_ctx trie_ctx[CLS_MAX_TRIES];
- struct cls_subtable *subtable;
+ const struct cls_match *match;
+ /* Highest-priority flow in 'cls' that certainly matches 'flow'. */
+ const struct cls_match *hard = NULL;
+ int hard_pri = INT_MIN; /* hard ? hard->priority : INT_MIN. */
+
+ /* Highest-priority conjunctive flows in 'cls' matching 'flow'. Since
+ * these are (components of) conjunctive flows, we can only know whether
+ * the full conjunctive flow matches after seeing multiple of them. Thus,
+ * we refer to these as "soft matches". */
+ struct cls_conjunction_set *soft_stub[64];
+ struct cls_conjunction_set **soft = soft_stub;
+ size_t n_soft = 0, allocated_soft = ARRAY_SIZE(soft_stub);
+ int soft_pri = INT_MIN; /* n_soft ? MAX(soft[*]->priority) : INT_MIN. */
/* Synchronize for cls->n_tries and subtable->trie_plen. They can change
* when table configuration changes, which happens typically only on
* startup. */
atomic_thread_fence(memory_order_acquire);
- /* 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 = (cmap_is_empty(&cls->partitions)
- ? NULL
- : find_partition(cls, flow->metadata,
- hash_metadata(flow->metadata)));
- tags = partition ? partition->tags : TAG_ARBITRARY;
-
/* Initialize trie contexts for find_match_wc(). */
for (int i = 0; i < cls->n_tries; i++) {
trie_ctx_init(&trie_ctx[i], &cls->tries[i]);
}
- best = NULL;
- PVECTOR_FOR_EACH_PRIORITY(subtable, best_priority, 2,
- sizeof(struct cls_subtable), &cls->subtables) {
- const struct cls_match *rule;
-
- if (!tag_intersects(tags, subtable->tag)) {
+ /* Main loop. */
+ struct cls_subtable *subtable;
+ PVECTOR_FOR_EACH_PRIORITY (subtable, hard_pri, 2, sizeof *subtable,
+ &cls->subtables) {
+ struct cls_conjunction_set *conj_set;
+
+ /* Skip subtables with no match, or where the match is lower-priority
+ * than some certain match we've already found. */
+ match = find_match_wc(subtable, version, flow, trie_ctx, cls->n_tries,
+ wc);
+ if (!match || match->priority <= hard_pri) {
continue;
}
- rule = find_match_wc(subtable, flow, trie_ctx, cls->n_tries, wc);
- if (rule && rule->priority > best_priority) {
- best_priority = rule->priority;
- best = rule;
+ conj_set = ovsrcu_get(struct cls_conjunction_set *, &match->conj_set);
+ if (!conj_set) {
+ /* 'match' isn't part of a conjunctive match. It's the best
+ * certain match we've got so far, since we know that it's
+ * higher-priority than hard_pri.
+ *
+ * (There might be a higher-priority conjunctive match. We can't
+ * tell yet.) */
+ hard = match;
+ hard_pri = hard->priority;
+ } else if (allow_conjunctive_matches) {
+ /* 'match' is part of a conjunctive match. Add it to the list. */
+ if (OVS_UNLIKELY(n_soft >= allocated_soft)) {
+ struct cls_conjunction_set **old_soft = soft;
+
+ allocated_soft *= 2;
+ soft = xmalloc(allocated_soft * sizeof *soft);
+ memcpy(soft, old_soft, n_soft * sizeof *soft);
+ if (old_soft != soft_stub) {
+ free(old_soft);
+ }
+ }
+ soft[n_soft++] = conj_set;
+
+ /* Keep track of the highest-priority soft match. */
+ if (soft_pri < match->priority) {
+ soft_pri = match->priority;
+ }
+ }
+ }
+
+ /* In the common case, at this point we have no soft matches and we can
+ * return immediately. (We do the same thing if we have potential soft
+ * matches but none of them are higher-priority than our hard match.) */
+ if (hard_pri >= soft_pri) {
+ if (soft != soft_stub) {
+ free(soft);
+ }
+ return hard ? hard->cls_rule : NULL;
+ }
+
+ /* At this point, we have some soft matches. We might also have a hard
+ * match; if so, its priority is lower than the highest-priority soft
+ * match. */
+
+ /* Soft match loop.
+ *
+ * Check whether soft matches are real matches. */
+ for (;;) {
+ /* Delete soft matches that are null. This only happens in second and
+ * subsequent iterations of the soft match loop, when we drop back from
+ * a high-priority soft match to a lower-priority one.
+ *
+ * Also, delete soft matches whose priority is less than or equal to
+ * the hard match's priority. In the first iteration of the soft
+ * match, these can be in 'soft' because the earlier main loop found
+ * the soft match before the hard match. In second and later iteration
+ * of the soft match loop, these can be in 'soft' because we dropped
+ * back from a high-priority soft match to a lower-priority soft match.
+ *
+ * It is tempting to delete soft matches that cannot be satisfied
+ * because there are fewer soft matches than required to satisfy any of
+ * their conjunctions, but we cannot do that because there might be
+ * lower priority soft or hard matches with otherwise identical
+ * matches. (We could special case those here, but there's no
+ * need--we'll do so at the bottom of the soft match loop anyway and
+ * this duplicates less code.)
+ *
+ * It's also tempting to break out of the soft match loop if 'n_soft ==
+ * 1' but that would also miss lower-priority hard matches. We could
+ * special case that also but again there's no need. */
+ for (int i = 0; i < n_soft; ) {
+ if (!soft[i] || soft[i]->priority <= hard_pri) {
+ soft[i] = soft[--n_soft];
+ } else {
+ i++;
+ }
+ }
+ if (!n_soft) {
+ break;
+ }
+
+ /* Find the highest priority among the soft matches. (We know this
+ * must be higher than the hard match's priority; otherwise we would
+ * have deleted all of the soft matches in the previous loop.) Count
+ * the number of soft matches that have that priority. */
+ soft_pri = INT_MIN;
+ int n_soft_pri = 0;
+ for (int i = 0; i < n_soft; i++) {
+ if (soft[i]->priority > soft_pri) {
+ soft_pri = soft[i]->priority;
+ n_soft_pri = 1;
+ } else if (soft[i]->priority == soft_pri) {
+ n_soft_pri++;
+ }
+ }
+ ovs_assert(soft_pri > hard_pri);
+
+ /* Look for a real match among the highest-priority soft matches.
+ *
+ * It's unusual to have many conjunctive matches, so we use stubs to
+ * avoid calling malloc() in the common case. An hmap has a built-in
+ * stub for up to 2 hmap_nodes; possibly, we would benefit a variant
+ * with a bigger stub. */
+ struct conjunctive_match cm_stubs[16];
+ struct hmap matches;
+
+ hmap_init(&matches);
+ for (int i = 0; i < n_soft; i++) {
+ uint32_t id;
+
+ if (soft[i]->priority == soft_pri
+ && find_conjunctive_match(soft[i], n_soft_pri, &matches,
+ cm_stubs, ARRAY_SIZE(cm_stubs),
+ &id)) {
+ uint32_t saved_conj_id = flow->conj_id;
+ const struct cls_rule *rule;
+
+ flow->conj_id = id;
+ rule = classifier_lookup__(cls, version, flow, wc, false);
+ flow->conj_id = saved_conj_id;
+
+ if (rule) {
+ free_conjunctive_matches(&matches,
+ cm_stubs, ARRAY_SIZE(cm_stubs));
+ if (soft != soft_stub) {
+ free(soft);
+ }
+ return rule;
+ }
+ }
+ }
+ free_conjunctive_matches(&matches, cm_stubs, ARRAY_SIZE(cm_stubs));
+
+ /* There's no real match among the highest-priority soft matches.
+ * However, if any of those soft matches has a lower-priority but
+ * otherwise identical flow match, then we need to consider those for
+ * soft or hard matches.
+ *
+ * The next iteration of the soft match loop will delete any null
+ * pointers we put into 'soft' (and some others too). */
+ for (int i = 0; i < n_soft; i++) {
+ if (soft[i]->priority != soft_pri) {
+ continue;
+ }
+
+ /* Find next-lower-priority flow with identical flow match. */
+ match = next_visible_rule_in_list(soft[i]->match, version);
+ if (match) {
+ soft[i] = ovsrcu_get(struct cls_conjunction_set *,
+ &match->conj_set);
+ if (!soft[i]) {
+ /* The flow is a hard match; don't treat as a soft
+ * match. */
+ if (match->priority > hard_pri) {
+ hard = match;
+ hard_pri = hard->priority;
+ }
+ }
+ } else {
+ /* No such lower-priority flow (probably the common case). */
+ soft[i] = NULL;
+ }
}
}
- return best ? best->cls_rule : NULL;
+ if (soft != soft_stub) {
+ free(soft);
+ }
+ return hard ? hard->cls_rule : NULL;
+}
+
+/* Finds and returns the highest-priority rule in 'cls' that matches 'flow' and
+ * that is visible in 'version'. Returns a null pointer if no rules in 'cls'
+ * match 'flow'. If multiple rules 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()).
+ *
+ * 'flow' is non-const to allow for temporary modifications during the lookup.
+ * Any changes are restored before returning. */
+const struct cls_rule *
+classifier_lookup(const struct classifier *cls, cls_version_t version,
+ struct flow *flow, struct flow_wildcards *wc)
+{
+ return classifier_lookup__(cls, version, flow, wc, true);
}
/* Finds and returns a rule in 'cls' with exactly the same priority and
- * matching criteria as 'target'. Returns a null pointer if 'cls' doesn't
+ * matching criteria as 'target', and that is visible in 'version'.
+ * Only one such rule may ever exist. Returns a null pointer if 'cls' doesn't
* contain an exact match. */
const struct cls_rule *
classifier_find_rule_exactly(const struct classifier *cls,
- const struct cls_rule *target)
+ const struct cls_rule *target,
+ cls_version_t version)
{
const struct cls_match *head, *rule;
const struct cls_subtable *subtable;
- subtable = find_subtable(cls, &target->match.mask);
+ subtable = find_subtable(cls, target->match.mask);
if (!subtable) {
return NULL;
}
- head = find_equal(subtable, &target->match.flow,
- miniflow_hash_in_minimask(&target->match.flow,
- &target->match.mask, 0));
+ head = find_equal(subtable, target->match.flow,
+ miniflow_hash_in_minimask(target->match.flow,
+ target->match.mask, 0));
if (!head) {
return NULL;
}
- FOR_EACH_RULE_IN_LIST (rule, head) {
- if (target->priority >= rule->priority) {
- return target->priority == rule->priority ? rule->cls_rule : NULL;
+ CLS_MATCH_FOR_EACH (rule, head) {
+ if (rule->priority < target->priority) {
+ break; /* Not found. */
+ }
+ if (rule->priority == target->priority
+ && cls_match_visible_in_version(rule, version)) {
+ return rule->cls_rule;
}
}
return NULL;
}
/* Finds and returns a rule in 'cls' with priority 'priority' and exactly the
- * same matching criteria as 'target'. Returns a null pointer if 'cls' doesn't
- * contain an exact match. */
+ * same matching criteria as 'target', and that is visible in 'version'.
+ * Returns a null pointer if 'cls' doesn't contain an exact match visible in
+ * 'version'. */
const struct cls_rule *
classifier_find_match_exactly(const struct classifier *cls,
- const struct match *target, int priority)
+ const struct match *target, int priority,
+ cls_version_t version)
{
const struct cls_rule *retval;
struct cls_rule cr;
cls_rule_init(&cr, target, priority);
- retval = classifier_find_rule_exactly(cls, &cr);
+ retval = classifier_find_rule_exactly(cls, &cr, version);
cls_rule_destroy(&cr);
return retval;
}
-/* Checks if 'target' would overlap any other rule in 'cls'. Two rules are
- * considered to overlap if both rules have the same priority and a packet
- * could match both.
+/* Checks if 'target' would overlap any other rule in 'cls' in 'version'. Two
+ * rules are considered to overlap if both rules have the same priority and a
+ * packet could match both, and if both rules are visible in the same version.
*
* A trivial example of overlapping rules is two rules matching disjoint sets
* of fields. E.g., if one rule matches only on port number, while another only
* dl_type could match both, if the rules also have the same priority. */
bool
classifier_rule_overlaps(const struct classifier *cls,
- const struct cls_rule *target)
+ const struct cls_rule *target, cls_version_t version)
{
struct cls_subtable *subtable;
/* Iterate subtables in the descending max priority order. */
PVECTOR_FOR_EACH_PRIORITY (subtable, target->priority - 1, 2,
sizeof(struct cls_subtable), &cls->subtables) {
- uint32_t storage[FLOW_U32S];
- struct minimask mask;
+ struct {
+ struct minimask mask;
+ uint64_t storage[FLOW_U64S];
+ } m;
const struct cls_rule *rule;
- minimask_combine(&mask, &target->match.mask, &subtable->mask, storage);
+ minimask_combine(&m.mask, target->match.mask, &subtable->mask,
+ m.storage);
RCULIST_FOR_EACH (rule, node, &subtable->rules_list) {
if (rule->priority == target->priority
- && miniflow_equal_in_minimask(&target->match.flow,
- &rule->match.flow, &mask)) {
+ && miniflow_equal_in_minimask(target->match.flow,
+ rule->match.flow, &m.mask)
+ && cls_match_visible_in_version(rule->cls_match, version)) {
return true;
}
}
cls_rule_is_loose_match(const struct cls_rule *rule,
const struct minimatch *criteria)
{
- return (!minimask_has_extra(&rule->match.mask, &criteria->mask)
- && miniflow_equal_in_minimask(&rule->match.flow, &criteria->flow,
- &criteria->mask));
+ return (!minimask_has_extra(rule->match.mask, criteria->mask)
+ && miniflow_equal_in_minimask(rule->match.flow, criteria->flow,
+ criteria->mask));
}
\f
/* Iteration. */
static bool
-rule_matches(const struct cls_rule *rule, const struct cls_rule *target)
+rule_matches(const struct cls_rule *rule, const struct cls_rule *target,
+ cls_version_t version)
{
- return (!target
- || miniflow_equal_in_minimask(&rule->match.flow,
- &target->match.flow,
- &target->match.mask));
+ /* Rule may only match a target if it is visible in target's version. */
+ return cls_match_visible_in_version(rule->cls_match, version)
+ && (!target || miniflow_equal_in_minimask(rule->match.flow,
+ target->match.flow,
+ target->match.mask));
}
static const struct cls_rule *
struct cls_cursor *cursor)
{
if (!cursor->target
- || !minimask_has_extra(&subtable->mask, &cursor->target->match.mask)) {
+ || !minimask_has_extra(&subtable->mask, cursor->target->match.mask)) {
const struct cls_rule *rule;
RCULIST_FOR_EACH (rule, node, &subtable->rules_list) {
- if (rule_matches(rule, cursor->target)) {
+ if (rule_matches(rule, cursor->target, cursor->version)) {
return rule;
}
}
}
/* Initializes 'cursor' for iterating through rules in 'cls', and returns the
- * first matching cls_rule via '*pnode', or NULL if there are no matches.
+ * cursor.
*
- * - If 'target' is null, the cursor will visit every rule in 'cls'.
+ * - If 'target' is null, or if the 'target' is a catchall target, the
+ * cursor will visit every rule in 'cls' that is visible in 'version'.
*
* - If 'target' is nonnull, the cursor will visit each 'rule' in 'cls'
- * such that cls_rule_is_loose_match(rule, target) returns true.
+ * such that cls_rule_is_loose_match(rule, target) returns true and that
+ * the rule is visible in 'version'.
*
* Ignores target->priority. */
-struct cls_cursor cls_cursor_start(const struct classifier *cls,
- const struct cls_rule *target)
+struct cls_cursor
+cls_cursor_start(const struct classifier *cls, const struct cls_rule *target,
+ cls_version_t version)
{
struct cls_cursor cursor;
struct cls_subtable *subtable;
cursor.cls = cls;
cursor.target = target && !cls_rule_is_catchall(target) ? target : NULL;
+ cursor.version = version;
cursor.rule = NULL;
/* Find first rule. */
rule = cursor->rule;
subtable = cursor->subtable;
RCULIST_FOR_EACH_CONTINUE (rule, node, &subtable->rules_list) {
- if (rule_matches(rule, cursor->target)) {
+ if (rule_matches(rule, cursor->target, cursor->version)) {
return rule;
}
}
return NULL;
}
+/* Initializes 'map' with a subset of 'miniflow''s maps that includes only the
+ * portions with u64-offset 'i' such that 'start' <= i < 'end'. Does not copy
+ * any data from 'miniflow' to 'map'. */
+static struct flowmap
+miniflow_get_map_in_range(const struct miniflow *miniflow, uint8_t start,
+ uint8_t end)
+{
+ struct flowmap map;
+ size_t ofs = 0;
+
+ map = miniflow->map;
+
+ /* Clear the bits before 'start'. */
+ while (start >= MAP_T_BITS) {
+ start -= MAP_T_BITS;
+ ofs += MAP_T_BITS;
+ map.bits[start / MAP_T_BITS] = 0;
+ }
+ if (start > 0) {
+ flowmap_clear(&map, ofs, start);
+ }
+
+ /* Clear the bits starting at 'end'. */
+ if (end < FLOW_U64S) {
+ /* flowmap_clear() can handle at most MAP_T_BITS at a time. */
+ ovs_assert(FLOW_U64S - end <= MAP_T_BITS);
+ flowmap_clear(&map, end, FLOW_U64S - end);
+ }
+ return map;
+}
+
/* The new subtable will be visible to the readers only after this. */
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;
+ struct flowmap stage_map;
uint8_t prev;
- int count = count_1bits(mask->masks.map);
+ size_t count = miniflow_n_values(&mask->masks);
- subtable = xzalloc(sizeof *subtable - sizeof mask->masks.inline_values
- + MINIFLOW_VALUES_SIZE(count));
+ subtable = xzalloc(sizeof *subtable + MINIFLOW_VALUES_SIZE(count));
cmap_init(&subtable->rules);
- miniflow_clone_inline(CONST_CAST(struct miniflow *, &subtable->mask.masks),
- &mask->masks, count);
+ miniflow_clone(CONST_CAST(struct miniflow *, &subtable->mask.masks),
+ &mask->masks, count);
/* 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]);
+ stage_map = miniflow_get_map_in_range(&mask->masks, prev,
+ cls->flow_segments[i]);
/* Add an index if it adds mask bits. */
- if (!flow_wildcards_equal(&new, &old)) {
+ if (!flowmap_is_empty(stage_map)) {
cmap_init(&subtable->indices[index]);
- *CONST_CAST(uint8_t *, &subtable->index_ofs[index])
- = cls->flow_segments[i];
+ *CONST_CAST(struct flowmap *, &subtable->index_maps[index])
+ = stage_map;
index++;
- old = new;
}
prev = cls->flow_segments[i];
}
- /* Check if the rest of the subtable's mask adds any bits,
+ /* Map for the final stage. */
+ *CONST_CAST(struct flowmap *, &subtable->index_maps[index])
+ = miniflow_get_map_in_range(&mask->masks, prev, FLOW_U64S);
+ /* Check if the final stage 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)) {
+ if (flowmap_equal(subtable->index_maps[index],
+ subtable->index_maps[index - 1])) {
--index;
- *CONST_CAST(uint8_t *, &subtable->index_ofs[index]) = 0;
cmap_destroy(&subtable->indices[index]);
}
}
*CONST_CAST(uint8_t *, &subtable->n_indices) = index;
- *CONST_CAST(tag_type *, &subtable->tag) =
- (minimask_get_metadata_mask(mask) == OVS_BE64_MAX
- ? tag_create_deterministic(hash)
- : TAG_ALL);
-
for (i = 0; i < cls->n_tries; i++) {
subtable->trie_plen[i] = minimask_get_prefix_len(mask,
cls->tries[i].field);
ovsrcu_postpone(free, subtable);
}
-struct range {
- uint8_t start;
- uint8_t end;
-};
-
static unsigned int be_get_bit_at(const ovs_be32 value[], unsigned int ofs);
/* Return 'true' if can skip rest of the subtable based on the prefix trie
static inline bool
check_tries(struct trie_ctx trie_ctx[CLS_MAX_TRIES], unsigned int n_tries,
const unsigned int field_plen[CLS_MAX_TRIES],
- const struct range ofs, const struct flow *flow,
+ const struct flowmap range_map, const struct flow *flow,
struct flow_wildcards *wc)
{
int j;
* fields using the prefix tries. The trie checks are done only as
* needed to avoid folding in additional bits to the wildcards mask. */
for (j = 0; j < n_tries; j++) {
- /* Is the trie field relevant for this subtable? */
- if (field_plen[j]) {
+ /* Is the trie field relevant for this subtable, and
+ is the trie field within the current range of fields? */
+ if (field_plen[j] &&
+ flowmap_is_set(&range_map, trie_ctx[j].be32ofs / 2)) {
struct trie_ctx *ctx = &trie_ctx[j];
- uint8_t be32ofs = ctx->be32ofs;
-
- /* Is the trie field within the current range of fields? */
- if (be32ofs >= ofs.start && be32ofs < ofs.end) {
- /* On-demand trie lookup. */
- if (!ctx->lookup_done) {
- memset(&ctx->match_plens, 0, sizeof ctx->match_plens);
- ctx->maskbits = trie_lookup(ctx->trie, flow,
- &ctx->match_plens);
- ctx->lookup_done = true;
+
+ /* On-demand trie lookup. */
+ if (!ctx->lookup_done) {
+ memset(&ctx->match_plens, 0, sizeof ctx->match_plens);
+ ctx->maskbits = trie_lookup(ctx->trie, flow, &ctx->match_plens);
+ ctx->lookup_done = true;
+ }
+ /* Possible to skip the rest of the subtable if subtable's
+ * prefix on the field is not included in the lookup result. */
+ if (!be_get_bit_at(&ctx->match_plens.be32, field_plen[j] - 1)) {
+ /* We want the trie lookup to never result in unwildcarding
+ * any bits that would not be unwildcarded otherwise.
+ * Since the trie is shared by the whole classifier, it is
+ * possible that the 'maskbits' contain bits that are
+ * irrelevant for the partition relevant for the current
+ * packet. Hence the checks below. */
+
+ /* Check that the trie result will not unwildcard more bits
+ * than this subtable would otherwise. */
+ if (ctx->maskbits <= field_plen[j]) {
+ /* Unwildcard the bits and skip the rest. */
+ mask_set_prefix_bits(wc, ctx->be32ofs, ctx->maskbits);
+ /* Note: Prerequisite already unwildcarded, as the only
+ * prerequisite of the supported trie lookup fields is
+ * the ethertype, which is always unwildcarded. */
+ return true;
}
- /* Possible to skip the rest of the subtable if subtable's
- * prefix on the field is not included in the lookup result. */
- if (!be_get_bit_at(&ctx->match_plens.be32, field_plen[j] - 1)) {
- /* We want the trie lookup to never result in unwildcarding
- * any bits that would not be unwildcarded otherwise.
- * Since the trie is shared by the whole classifier, it is
- * possible that the 'maskbits' contain bits that are
- * irrelevant for the partition relevant for the current
- * packet. Hence the checks below. */
-
- /* Check that the trie result will not unwildcard more bits
- * than this subtable would otherwise. */
- if (ctx->maskbits <= field_plen[j]) {
- /* Unwildcard the bits and skip the rest. */
- mask_set_prefix_bits(wc, be32ofs, ctx->maskbits);
- /* Note: Prerequisite already unwildcarded, as the only
- * prerequisite of the supported trie lookup fields is
- * the ethertype, which is always unwildcarded. */
- return true;
- }
- /* Can skip if the field is already unwildcarded. */
- if (mask_prefix_bits_set(wc, be32ofs, ctx->maskbits)) {
- return true;
- }
+ /* Can skip if the field is already unwildcarded. */
+ if (mask_prefix_bits_set(wc, ctx->be32ofs, ctx->maskbits)) {
+ return true;
}
}
}
const struct minimask *mask,
const struct flow *target)
{
- const uint32_t *flowp = miniflow_get_u32_values(flow);
- const uint32_t *maskp = miniflow_get_u32_values(&mask->masks);
- uint32_t idx;
+ const uint64_t *flowp = miniflow_get_values(flow);
+ const uint64_t *maskp = miniflow_get_values(&mask->masks);
+ const uint64_t *target_u64 = (const uint64_t *)target;
+ map_t map;
- MAP_FOR_EACH_INDEX(idx, mask->masks.map) {
- uint32_t diff = (*flowp++ ^ flow_u32_value(target, idx)) & *maskp++;
+ FLOWMAP_FOR_EACH_MAP (map, mask->masks.map) {
+ size_t idx;
- if (diff) {
- return false;
+ MAP_FOR_EACH_INDEX (idx, map) {
+ if ((*flowp++ ^ target_u64[idx]) & *maskp++) {
+ return false;
+ }
}
+ target_u64 += MAP_T_BITS;
}
-
return true;
}
static inline const struct cls_match *
-find_match(const struct cls_subtable *subtable, const struct flow *flow,
- uint32_t hash)
+find_match(const struct cls_subtable *subtable, cls_version_t version,
+ const struct flow *flow, uint32_t hash)
{
- const struct cls_match *rule;
+ const struct cls_match *head, *rule;
- CMAP_FOR_EACH_WITH_HASH (rule, cmap_node, hash, &subtable->rules) {
- if (miniflow_and_mask_matches_flow(&rule->flow, &subtable->mask,
- flow)) {
- return rule;
+ CMAP_FOR_EACH_WITH_HASH (head, cmap_node, hash, &subtable->rules) {
+ if (OVS_LIKELY(miniflow_and_mask_matches_flow(&head->flow,
+ &subtable->mask,
+ flow))) {
+ /* Return highest priority rule that is visible. */
+ CLS_MATCH_FOR_EACH (rule, head) {
+ if (OVS_LIKELY(cls_match_visible_in_version(rule, version))) {
+ return rule;
+ }
+ }
}
}
const struct flow *target,
struct flow_wildcards *wc)
{
- const uint32_t *flowp = miniflow_get_u32_values(flow);
- const uint32_t *maskp = miniflow_get_u32_values(&mask->masks);
- uint32_t idx;
-
- MAP_FOR_EACH_INDEX(idx, mask->masks.map) {
- uint32_t mask = *maskp++;
- uint32_t diff = (*flowp++ ^ flow_u32_value(target, idx)) & mask;
-
- if (diff) {
- /* Only unwildcard if none of the differing bits is already
- * exact-matched. */
- if (!(flow_u32_value(&wc->masks, idx) & diff)) {
- /* Keep one bit of the difference. */
- *flow_u32_lvalue(&wc->masks, idx) |= rightmost_1bit(diff);
+ const uint64_t *flowp = miniflow_get_values(flow);
+ const uint64_t *maskp = miniflow_get_values(&mask->masks);
+ const uint64_t *target_u64 = (const uint64_t *)target;
+ uint64_t *wc_u64 = (uint64_t *)&wc->masks;
+ uint64_t diff;
+ size_t idx;
+ map_t map;
+
+ FLOWMAP_FOR_EACH_MAP (map, mask->masks.map) {
+ MAP_FOR_EACH_INDEX(idx, map) {
+ uint64_t msk = *maskp++;
+
+ diff = (*flowp++ ^ target_u64[idx]) & msk;
+ if (diff) {
+ goto out;
}
- return false;
+
+ /* Fill in the bits that were looked at. */
+ wc_u64[idx] |= msk;
}
- /* Fill in the bits that were looked at. */
- *flow_u32_lvalue(&wc->masks, idx) |= mask;
+ target_u64 += MAP_T_BITS;
+ wc_u64 += MAP_T_BITS;
}
-
return true;
-}
-/* Unwildcard the fields looked up so far, if any. */
-static void
-fill_range_wc(const struct cls_subtable *subtable, struct flow_wildcards *wc,
- uint8_t to)
-{
- if (to) {
- flow_wildcards_fold_minimask_range(wc, &subtable->mask, 0, to);
+out:
+ /* Only unwildcard if none of the differing bits is already
+ * exact-matched. */
+ if (!(wc_u64[idx] & diff)) {
+ /* Keep one bit of the difference. The selected bit may be
+ * different in big-endian v.s. little-endian systems. */
+ wc_u64[idx] |= rightmost_1bit(diff);
}
+ return false;
}
static const struct cls_match *
-find_match_wc(const struct cls_subtable *subtable, const struct flow *flow,
- struct trie_ctx trie_ctx[CLS_MAX_TRIES], unsigned int n_tries,
- struct flow_wildcards *wc)
+find_match_wc(const struct cls_subtable *subtable, cls_version_t version,
+ const struct flow *flow, struct trie_ctx trie_ctx[CLS_MAX_TRIES],
+ unsigned int n_tries, struct flow_wildcards *wc)
{
- uint32_t basis = 0, hash;
- const struct cls_match *rule = NULL;
- int i;
- struct range ofs;
-
if (OVS_UNLIKELY(!wc)) {
- return find_match(subtable, flow,
+ return find_match(subtable, version, flow,
flow_hash_in_minimask(flow, &subtable->mask, 0));
}
- ofs.start = 0;
+ uint32_t basis = 0, hash;
+ const struct cls_match *rule = NULL;
+ struct flowmap stages_map = FLOWMAP_EMPTY_INITIALIZER;
+ unsigned int mask_offset = 0;
+ int i;
+
/* Try to finish early by checking fields in segments. */
for (i = 0; i < subtable->n_indices; i++) {
const struct cmap_node *inode;
- ofs.end = subtable->index_ofs[i];
-
- if (check_tries(trie_ctx, n_tries, subtable->trie_plen, ofs, flow,
- wc)) {
+ if (check_tries(trie_ctx, n_tries, subtable->trie_plen,
+ subtable->index_maps[i], flow, wc)) {
/* 'wc' bits for the trie field set, now unwildcard the preceding
* bits used so far. */
- fill_range_wc(subtable, wc, ofs.start);
- return NULL;
+ goto no_match;
}
- hash = flow_hash_in_minimask_range(flow, &subtable->mask, ofs.start,
- ofs.end, &basis);
+
+ /* Accumulate the map used so far. */
+ stages_map = flowmap_or(stages_map, subtable->index_maps[i]);
+
+ hash = flow_hash_in_minimask_range(flow, &subtable->mask,
+ subtable->index_maps[i],
+ &mask_offset, &basis);
+
inode = cmap_find(&subtable->indices[i], hash);
if (!inode) {
- /* No match, can stop immediately, but must fold in the bits
- * used in lookup so far. */
- fill_range_wc(subtable, wc, ofs.end);
- return NULL;
+ goto no_match;
}
/* If we have narrowed down to a single rule already, check whether
* (Rare) hash collisions may cause us to miss the opportunity for this
* optimization. */
if (!cmap_node_next(inode)) {
- ASSIGN_CONTAINER(rule, inode - i, index_nodes);
- if (miniflow_and_mask_matches_flow_wc(&rule->flow, &subtable->mask,
+ const struct cls_match *head;
+
+ ASSIGN_CONTAINER(head, inode - i, index_nodes);
+ if (miniflow_and_mask_matches_flow_wc(&head->flow, &subtable->mask,
flow, wc)) {
- return rule;
+ /* Return highest priority rule that is visible. */
+ CLS_MATCH_FOR_EACH (rule, head) {
+ if (OVS_LIKELY(cls_match_visible_in_version(rule,
+ version))) {
+ return rule;
+ }
+ }
}
return NULL;
}
- ofs.start = ofs.end;
}
- ofs.end = FLOW_U32S;
/* Trie check for the final range. */
- if (check_tries(trie_ctx, n_tries, subtable->trie_plen, ofs, flow, wc)) {
- fill_range_wc(subtable, wc, ofs.start);
- return NULL;
+ if (check_tries(trie_ctx, n_tries, subtable->trie_plen,
+ subtable->index_maps[i], flow, wc)) {
+ goto no_match;
}
- hash = flow_hash_in_minimask_range(flow, &subtable->mask, ofs.start,
- ofs.end, &basis);
- rule = find_match(subtable, flow, hash);
+ hash = flow_hash_in_minimask_range(flow, &subtable->mask,
+ subtable->index_maps[i],
+ &mask_offset, &basis);
+ rule = find_match(subtable, version, flow, hash);
if (!rule && subtable->ports_mask_len) {
- /* Ports are always part of the final range, if any.
- * No match was found for the ports. Use the ports trie to figure out
- * which ports bits to unwildcard. */
+ /* The final stage had ports, but there was no match. Instead of
+ * unwildcarding all the ports bits, use the ports trie to figure out a
+ * smaller set of bits to unwildcard. */
unsigned int mbits;
ovs_be32 value, plens, mask;
((OVS_FORCE ovs_be32 *)&wc->masks)[TP_PORTS_OFS32] |=
mask & be32_prefix_mask(mbits);
- /* Unwildcard all bits in the mask upto the ports, as they were used
- * to determine there is no match. */
- fill_range_wc(subtable, wc, TP_PORTS_OFS32);
- return NULL;
+ goto no_match;
}
/* Must unwildcard all the fields, as they were looked at. */
flow_wildcards_fold_minimask(wc, &subtable->mask);
return rule;
+
+no_match:
+ /* Unwildcard the bits in stages so far, as they were used in determining
+ * there is no match. */
+ flow_wildcards_fold_minimask_in_map(wc, &subtable->mask, stages_map);
+ return NULL;
}
static struct cls_match *
static unsigned int
trie_lookup(const struct cls_trie *trie, const struct flow *flow,
- union mf_value *plens)
+ union trie_prefix *plens)
{
const struct mf_field *mf = trie->field;
const struct mf_field *mf)
{
unsigned int n_bits = 0, mask_tz = 0; /* Non-zero when end of mask seen. */
- uint8_t u32_ofs = mf->flow_be32ofs;
- uint8_t u32_end = u32_ofs + mf->n_bytes / 4;
+ uint8_t be32_ofs = mf->flow_be32ofs;
+ uint8_t be32_end = be32_ofs + mf->n_bytes / 4;
- for (; u32_ofs < u32_end; ++u32_ofs) {
- uint32_t mask;
- mask = ntohl((OVS_FORCE ovs_be32)minimask_get(minimask, u32_ofs));
+ for (; be32_ofs < be32_end; ++be32_ofs) {
+ uint32_t mask = ntohl(minimask_get_be32(minimask, be32_ofs));
/* Validate mask, count the mask length. */
if (mask_tz) {
static const ovs_be32 *
minimatch_get_prefix(const struct minimatch *match, const struct mf_field *mf)
{
- return miniflow_get_be32_values(&match->flow) +
- count_1bits(match->flow.map & ((UINT64_C(1) << mf->flow_be32ofs) - 1));
+ size_t u64_ofs = mf->flow_be32ofs / 2;
+
+ return (OVS_FORCE const ovs_be32 *)miniflow_get__(match->flow, u64_ofs)
+ + (mf->flow_be32ofs & 1);
}
/* Insert rule in to the prefix tree.
trie_remove_prefix(rcu_trie_ptr *root, const ovs_be32 *prefix, int mlen)
{
struct trie_node *node;
- rcu_trie_ptr *edges[sizeof(union mf_value) * 8];
+ rcu_trie_ptr *edges[sizeof(union trie_prefix) * CHAR_BIT];
int depth = 0, ofs = 0;
/* Walk the tree. */
* that actually exist in the classifier are ever removed. */
VLOG_WARN("Trying to remove non-existing rule from a prefix trie.");
}
+\f
+
+#define CLS_MATCH_POISON (struct cls_match *)(UINTPTR_MAX / 0xf * 0xb)
+
+void
+cls_match_free_cb(struct cls_match *rule)
+{
+ ovsrcu_set_hidden(&rule->next, CLS_MATCH_POISON);
+ free(rule);
+}
projects / cascardo / ovs.git / blobdiff