Fine with me go ahead and push it.
Ethan
On Tue, Apr 29, 2014 at 12:40 PM, Jarno Rajahalme <jrajaha...@nicira.com> wrote:
>
> On Apr 24, 2014, at 5:40 PM, Ethan Jackson <et...@nicira.com> wrote:
>
>> So it seems to me that the only data needed in struct classifier by
>> callers is the fat_rwlock. What if we add a classifier_rdlock() and a
>> classifier_wrlock() function. That done, we could entirely hide
>> struct classifier, and would need to make the distinction between it
>> and the cls_classifier. Thoughts?
>
> I wanted to avoid API changes in this series, but I like this in general.
> However, this would prevent the OVS_REQ_RDLOCK() type of static analyzer
> annotations on the API functions, and would result in additional function
> call indirections for the lock and unlock functions.
>
> Moreover, we should consider how to replace (most of) the locking with RCU,
> which would be another change on the classifier locking interface.
>
> Considering the above I would be inclined to push this patch as a step
> towards the above goals, with the understanding that more work on this will
> be done later.
>
> Jarno
>
>>
>> Ethan
>>
>> On Fri, Apr 18, 2014 at 12:41 PM, Jarno Rajahalme <jrajaha...@nicira.com>
>> wrote:
>>> It is better not to expose definitions not needed by users.
>>>
>>> Signed-off-by: Jarno Rajahalme <jrajaha...@nicira.com>
>>> ---
>>> lib/classifier.c | 134
>>> ++++++++++++++++++++++++++++++++++++-----------
>>> lib/classifier.h | 65 ++++-------------------
>>> tests/test-classifier.c | 6 +--
>>> 3 files changed, 115 insertions(+), 90 deletions(-)
>>>
>>> diff --git a/lib/classifier.c b/lib/classifier.c
>>> index 8ab1f9c..e48f0a1 100644
>>> --- a/lib/classifier.c
>>> +++ b/lib/classifier.c
>>> @@ -30,18 +30,70 @@
>>>
>>> VLOG_DEFINE_THIS_MODULE(classifier);
>>>
>>> +struct trie_node;
>>> +
>>> +/* Prefix trie for a 'field' */
>>> +struct cls_trie {
>>> + const struct mf_field *field; /* Trie field, or NULL. */
>>> + struct trie_node *root; /* NULL if none. */
>>> +};
>>> +
>>> +struct cls_classifier {
>>> + int n_rules; /* Total number of rules. */
>>> + uint8_t n_flow_segments;
>>> + uint8_t flow_segments[CLS_MAX_INDICES]; /* Flow segment boundaries to
>>> use
>>> + * for staged lookup. */
>>> + struct hmap subtables; /* Contains "struct cls_subtable"s. */
>>> + struct list subtables_priority; /* Subtables in descending priority
>>> order.
>>> + */
>>> + struct hmap partitions; /* Contains "struct cls_partition"s. */
>>> + struct cls_trie tries[CLS_MAX_TRIES]; /* Prefix tries. */
>>> + unsigned int n_tries;
>>> +};
>>> +
>>> +/* A set of rules that all have the same fields wildcarded. */
>>> +struct cls_subtable {
>>> + struct hmap_node hmap_node; /* Within struct cls_classifier 'subtables'
>>> + * hmap. */
>>> + struct list list_node; /* Within classifier 'subtables_priority'
>>> list.
>>> + */
>>> + struct hmap rules; /* Contains "struct cls_rule"s. */
>>> + struct minimask mask; /* Wildcards for fields. */
>>> + int n_rules; /* Number of rules, including duplicates.
>>> */
>>> + unsigned int max_priority; /* Max priority of any rule in the
>>> subtable. */
>>> + unsigned int max_count; /* Count of max_priority rules. */
>>> + tag_type tag; /* Tag generated from mask for
>>> partitioning. */
>>> + uint8_t n_indices; /* How many indices to use. */
>>> + uint8_t index_ofs[CLS_MAX_INDICES]; /* u32 flow segment boundaries. */
>>> + struct hindex indices[CLS_MAX_INDICES]; /* Staged lookup indices. */
>>> + unsigned int trie_plen[CLS_MAX_TRIES]; /* Trie prefix length in
>>> 'mask'. */
>>> +};
>>> +
>>> +/* Associates a metadata value (that is, a value of the OpenFlow 1.1+
>>> metadata
>>> + * field) with tags for the "cls_subtable"s that contain rules that match
>>> that
>>> + * metadata value. */
>>> +struct cls_partition {
>>> + struct hmap_node hmap_node; /* In struct cls_classifier's 'partitions'
>>> + * hmap. */
>>> + ovs_be64 metadata; /* metadata value for this partition. */
>>> + tag_type tags; /* OR of each flow's cls_subtable tag. */
>>> + struct tag_tracker tracker; /* Tracks the bits in 'tags'. */
>>> +};
>>> +
>>> +
>>> +
>>> struct trie_ctx;
>>> -static struct cls_subtable *find_subtable(const struct classifier *,
>>> +static struct cls_subtable *find_subtable(const struct cls_classifier *,
>>> const struct minimask *);
>>> -static struct cls_subtable *insert_subtable(struct classifier *,
>>> +static struct cls_subtable *insert_subtable(struct cls_classifier *,
>>> const struct minimask *);
>>>
>>> -static void destroy_subtable(struct classifier *, struct cls_subtable *);
>>> +static void destroy_subtable(struct cls_classifier *, struct cls_subtable
>>> *);
>>>
>>> -static void update_subtables_after_insertion(struct classifier *,
>>> +static void update_subtables_after_insertion(struct cls_classifier *,
>>> struct cls_subtable *,
>>> unsigned int new_priority);
>>> -static void update_subtables_after_removal(struct classifier *,
>>> +static void update_subtables_after_removal(struct cls_classifier *,
>>> struct cls_subtable *,
>>> unsigned int del_priority);
>>>
>>> @@ -51,7 +103,7 @@ static struct cls_rule *find_match_wc(const struct
>>> cls_subtable *,
>>> 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 classifier *,
>>> +static struct cls_rule *insert_rule(struct cls_classifier *,
>>> struct cls_subtable *, struct cls_rule
>>> *);
>>>
>>> /* Iterates RULE over HEAD and all of the cls_rules on HEAD->list. */
>>> @@ -67,7 +119,7 @@ static struct cls_rule *next_rule_in_list(struct
>>> cls_rule *);
>>>
>>> static unsigned int minimask_get_prefix_len(const struct minimask *,
>>> const struct mf_field *);
>>> -static void trie_init(struct classifier *, int trie_idx,
>>> +static void trie_init(struct cls_classifier *, int trie_idx,
>>> const struct mf_field *);
>>> static unsigned int trie_lookup(const struct cls_trie *, const struct flow
>>> *,
>>> unsigned int *checkbits);
>>> @@ -349,13 +401,18 @@ cls_rule_is_catchall(const struct cls_rule *rule)
>>> /* Initializes 'cls' as a classifier that initially contains no
>>> classification
>>> * rules. */
>>> void
>>> -classifier_init(struct classifier *cls, const uint8_t *flow_segments)
>>> +classifier_init(struct classifier *cls_, const uint8_t *flow_segments)
>>> {
>>> + struct cls_classifier *cls = xmalloc(sizeof *cls);
>>> +
>>> + fat_rwlock_init(&cls_->rwlock);
>>> +
>>> + cls_->cls = cls;
>>> +
>>> cls->n_rules = 0;
>>> hmap_init(&cls->subtables);
>>> list_init(&cls->subtables_priority);
>>> hmap_init(&cls->partitions);
>>> - fat_rwlock_init(&cls->rwlock);
>>> cls->n_flow_segments = 0;
>>> if (flow_segments) {
>>> while (cls->n_flow_segments < CLS_MAX_INDICES
>>> @@ -369,13 +426,19 @@ classifier_init(struct classifier *cls, const uint8_t
>>> *flow_segments)
>>> /* Destroys 'cls'. Rules within 'cls', if any, are not freed; this is the
>>> * caller's responsibility. */
>>> void
>>> -classifier_destroy(struct classifier *cls)
>>> +classifier_destroy(struct classifier *cls_)
>>> {
>>> - if (cls) {
>>> + if (cls_) {
>>> + struct cls_classifier *cls = cls_->cls;
>>> struct cls_subtable *partition, *next_partition;
>>> struct cls_subtable *subtable, *next_subtable;
>>> int i;
>>>
>>> + fat_rwlock_destroy(&cls_->rwlock);
>>> + if (!cls) {
>>> + return;
>>> + }
>>> +
>>> for (i = 0; i < cls->n_tries; i++) {
>>> trie_destroy(cls->tries[i].root);
>>> }
>>> @@ -392,7 +455,8 @@ classifier_destroy(struct classifier *cls)
>>> free(partition);
>>> }
>>> hmap_destroy(&cls->partitions);
>>> - fat_rwlock_destroy(&cls->rwlock);
>>> +
>>> + free(cls);
>>> }
>>> }
>>>
>>> @@ -401,10 +465,11 @@ BUILD_ASSERT_DECL(MFF_N_IDS <= 64);
>>>
>>> /* Set the fields for which prefix lookup should be performed. */
>>> void
>>> -classifier_set_prefix_fields(struct classifier *cls,
>>> +classifier_set_prefix_fields(struct classifier *cls_,
>>> const enum mf_field_id *trie_fields,
>>> unsigned int n_fields)
>>> {
>>> + struct cls_classifier *cls = cls_->cls;
>>> uint64_t fields = 0;
>>> int i, trie;
>>>
>>> @@ -439,7 +504,7 @@ classifier_set_prefix_fields(struct classifier *cls,
>>> }
>>>
>>> static void
>>> -trie_init(struct classifier *cls, int trie_idx,
>>> +trie_init(struct cls_classifier *cls, int trie_idx,
>>> const struct mf_field *field)
>>> {
>>> struct cls_trie *trie = &cls->tries[trie_idx];
>>> @@ -477,14 +542,14 @@ trie_init(struct classifier *cls, int trie_idx,
>>> bool
>>> classifier_is_empty(const struct classifier *cls)
>>> {
>>> - return cls->n_rules == 0;
>>> + return cls->cls->n_rules == 0;
>>> }
>>>
>>> /* Returns the number of rules in 'cls'. */
>>> int
>>> classifier_count(const struct classifier *cls)
>>> {
>>> - return cls->n_rules;
>>> + return cls->cls->n_rules;
>>> }
>>>
>>> static uint32_t
>>> @@ -495,7 +560,8 @@ hash_metadata(ovs_be64 metadata_)
>>> }
>>>
>>> static struct cls_partition *
>>> -find_partition(const struct classifier *cls, ovs_be64 metadata, uint32_t
>>> hash)
>>> +find_partition(const struct cls_classifier *cls, ovs_be64 metadata,
>>> + uint32_t hash)
>>> {
>>> struct cls_partition *partition;
>>>
>>> @@ -509,7 +575,7 @@ find_partition(const struct classifier *cls, ovs_be64
>>> metadata, uint32_t hash)
>>> }
>>>
>>> static struct cls_partition *
>>> -create_partition(struct classifier *cls, struct cls_subtable *subtable,
>>> +create_partition(struct cls_classifier *cls, struct cls_subtable *subtable,
>>> ovs_be64 metadata)
>>> {
>>> uint32_t hash = hash_metadata(metadata);
>>> @@ -539,8 +605,9 @@ create_partition(struct classifier *cls, struct
>>> cls_subtable *subtable,
>>> * rule, even rules that cannot have any effect because the new rule
>>> matches a
>>> * superset of their flows and has higher priority. */
>>> struct cls_rule *
>>> -classifier_replace(struct classifier *cls, struct cls_rule *rule)
>>> +classifier_replace(struct classifier *cls_, struct cls_rule *rule)
>>> {
>>> + struct cls_classifier *cls = cls_->cls;
>>> struct cls_rule *old_rule;
>>> struct cls_subtable *subtable;
>>>
>>> @@ -591,8 +658,9 @@ classifier_insert(struct classifier *cls, struct
>>> cls_rule *rule)
>>> * 'rule' with cls_rule_destroy(), freeing the memory block in which 'rule'
>>> * resides, etc., as necessary. */
>>> void
>>> -classifier_remove(struct classifier *cls, struct cls_rule *rule)
>>> +classifier_remove(struct classifier *cls_, struct cls_rule *rule)
>>> {
>>> + struct cls_classifier *cls = cls_->cls;
>>> struct cls_partition *partition;
>>> struct cls_rule *head;
>>> struct cls_subtable *subtable;
>>> @@ -672,9 +740,10 @@ trie_ctx_init(struct trie_ctx *ctx, const struct
>>> cls_trie *trie)
>>> * 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_classifier *cls = cls_->cls;
>>> const struct cls_partition *partition;
>>> struct cls_subtable *subtable;
>>> struct cls_rule *best;
>>> @@ -787,9 +856,10 @@ find_match_miniflow(const struct cls_subtable
>>> *subtable,
>>> * This function is optimized for the userspace datapath, which only ever
>>> has
>>> * one priority value for it's flows!
>>> */
>>> -struct cls_rule *classifier_lookup_miniflow_first(const struct classifier
>>> *cls,
>>> +struct cls_rule *classifier_lookup_miniflow_first(const struct classifier
>>> *cls_,
>>> const struct miniflow
>>> *flow)
>>> {
>>> + struct cls_classifier *cls = cls_->cls;
>>> struct cls_subtable *subtable;
>>>
>>> LIST_FOR_EACH (subtable, list_node, &cls->subtables_priority) {
>>> @@ -811,9 +881,10 @@ struct cls_rule
>>> *classifier_lookup_miniflow_first(const struct classifier *cls,
>>> * matching criteria as 'target'. Returns a null pointer if 'cls' doesn't
>>> * contain an exact match. */
>>> struct cls_rule *
>>> -classifier_find_rule_exactly(const struct classifier *cls,
>>> +classifier_find_rule_exactly(const struct classifier *cls_,
>>> const struct cls_rule *target)
>>> {
>>> + struct cls_classifier *cls = cls_->cls;
>>> struct cls_rule *head, *rule;
>>> struct cls_subtable *subtable;
>>>
>>> @@ -860,9 +931,10 @@ classifier_find_match_exactly(const struct classifier
>>> *cls,
>>> * considered to overlap if both rules have the same priority and a packet
>>> * could match both. */
>>> bool
>>> -classifier_rule_overlaps(const struct classifier *cls,
>>> +classifier_rule_overlaps(const struct classifier *cls_,
>>> const struct cls_rule *target)
>>> {
>>> + struct cls_classifier *cls = cls_->cls;
>>> struct cls_subtable *subtable;
>>>
>>> /* Iterate subtables in the descending max priority order. */
>>> @@ -976,7 +1048,7 @@ void
>>> cls_cursor_init(struct cls_cursor *cursor, const struct classifier *cls,
>>> const struct cls_rule *target)
>>> {
>>> - cursor->cls = cls;
>>> + cursor->cls = cls->cls;
>>> cursor->target = target && !cls_rule_is_catchall(target) ? target :
>>> NULL;
>>> }
>>>
>>> @@ -1035,7 +1107,7 @@ cls_cursor_next(struct cls_cursor *cursor, const
>>> struct cls_rule *rule_)
>>> }
>>>
>>> static struct cls_subtable *
>>> -find_subtable(const struct classifier *cls, const struct minimask *mask)
>>> +find_subtable(const struct cls_classifier *cls, const struct minimask
>>> *mask)
>>> {
>>> struct cls_subtable *subtable;
>>>
>>> @@ -1049,7 +1121,7 @@ find_subtable(const struct classifier *cls, const
>>> struct minimask *mask)
>>> }
>>>
>>> static struct cls_subtable *
>>> -insert_subtable(struct classifier *cls, const struct minimask *mask)
>>> +insert_subtable(struct cls_classifier *cls, const struct minimask *mask)
>>> {
>>> uint32_t hash = minimask_hash(mask, 0);
>>> struct cls_subtable *subtable;
>>> @@ -1104,7 +1176,7 @@ insert_subtable(struct classifier *cls, const struct
>>> minimask *mask)
>>> }
>>>
>>> static void
>>> -destroy_subtable(struct classifier *cls, struct cls_subtable *subtable)
>>> +destroy_subtable(struct cls_classifier *cls, struct cls_subtable *subtable)
>>> {
>>> int i;
>>>
>>> @@ -1129,7 +1201,7 @@ destroy_subtable(struct classifier *cls, struct
>>> cls_subtable *subtable)
>>> * 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,
>>> +update_subtables_after_insertion(struct cls_classifier *cls,
>>> struct cls_subtable *subtable,
>>> unsigned int new_priority)
>>> {
>>> @@ -1173,7 +1245,7 @@ update_subtables_after_insertion(struct classifier
>>> *cls,
>>> * 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_subtables_after_removal(struct classifier *cls,
>>> +update_subtables_after_removal(struct cls_classifier *cls,
>>> struct cls_subtable *subtable,
>>> unsigned int del_priority)
>>> {
>>> @@ -1390,7 +1462,7 @@ find_equal(struct cls_subtable *subtable, const
>>> struct miniflow *flow,
>>> }
>>>
>>> static struct cls_rule *
>>> -insert_rule(struct classifier *cls, struct cls_subtable *subtable,
>>> +insert_rule(struct cls_classifier *cls, struct cls_subtable *subtable,
>>> struct cls_rule *new)
>>> {
>>> struct cls_rule *head;
>>> diff --git a/lib/classifier.h b/lib/classifier.h
>>> index 9022fab..048aaa1 100644
>>> --- a/lib/classifier.h
>>> +++ b/lib/classifier.h
>>> @@ -232,60 +232,23 @@ extern "C" {
>>>
>>> /* Needed only for the lock annotation in struct classifier. */
>>> extern struct ovs_mutex ofproto_mutex;
>>> -struct trie_node;
>>>
>>> -/* Prefix trie for a 'field' */
>>> -struct cls_trie {
>>> - const struct mf_field *field; /* Trie field, or NULL. */
>>> - struct trie_node *root; /* NULL if none. */
>>> -};
>>> -
>>> -enum {
>>> - CLS_MAX_INDICES = 3, /* Maximum number of lookup indices per subtable.
>>> */
>>> - CLS_MAX_TRIES = 3 /* Maximum number of prefix trees per classifier.
>>> */
>>> -};
>>> +/* Classifier internal data structures. */
>>> +struct cls_classifier;
>>> +struct cls_subtable;
>>> +struct cls_partition;
>>>
>>> /* A flow classifier. */
>>> struct classifier {
>>> - int n_rules; /* Total number of rules. */
>>> - uint8_t n_flow_segments;
>>> - uint8_t flow_segments[CLS_MAX_INDICES]; /* Flow segment boundaries to
>>> use
>>> - * for staged lookup. */
>>> - struct hmap subtables; /* Contains "struct cls_subtable"s. */
>>> - struct list subtables_priority; /* Subtables in descending priority
>>> order.
>>> - */
>>> - struct hmap partitions; /* Contains "struct cls_partition"s. */
>>> struct fat_rwlock rwlock OVS_ACQ_AFTER(ofproto_mutex);
>>> - struct cls_trie tries[CLS_MAX_TRIES]; /* Prefix tries. */
>>> - unsigned int n_tries;
>>> + struct cls_classifier *cls;
>>> };
>>>
>>> -/* A set of rules that all have the same fields wildcarded. */
>>> -struct cls_subtable {
>>> - struct hmap_node hmap_node; /* Within struct classifier 'subtables'
>>> hmap.
>>> - */
>>> - struct list list_node; /* Within classifier 'subtables_priority'
>>> list.
>>> - */
>>> - struct hmap rules; /* Contains "struct cls_rule"s. */
>>> - struct minimask mask; /* Wildcards for fields. */
>>> - int n_rules; /* Number of rules, including duplicates.
>>> */
>>> - unsigned int max_priority; /* Max priority of any rule in the
>>> subtable. */
>>> - unsigned int max_count; /* Count of max_priority rules. */
>>> - tag_type tag; /* Tag generated from mask for
>>> partitioning. */
>>> - uint8_t n_indices; /* How many indices to use. */
>>> - uint8_t index_ofs[CLS_MAX_INDICES]; /* u32 flow segment boundaries. */
>>> - struct hindex indices[CLS_MAX_INDICES]; /* Staged lookup indices. */
>>> - unsigned int trie_plen[CLS_MAX_TRIES]; /* Trie prefix length in
>>> 'mask'. */
>>> +enum {
>>> + CLS_MAX_INDICES = 3, /* Maximum number of lookup indices per subtable.
>>> */
>>> + CLS_MAX_TRIES = 3 /* Maximum number of prefix trees per classifier.
>>> */
>>> };
>>>
>>> -/* Returns true if 'table' is a "catch-all" subtable that will match every
>>> - * packet (if there is no higher-priority match). */
>>> -static inline bool
>>> -cls_subtable_is_catchall(const struct cls_subtable *subtable)
>>> -{
>>> - return minimask_is_catchall(&subtable->mask);
>>> -}
>>> -
>>> /* A rule in a "struct cls_subtable". */
>>> struct cls_rule {
>>> struct hmap_node hmap_node; /* Within struct cls_subtable 'rules'. */
>>> @@ -297,16 +260,6 @@ struct cls_rule {
>>> * 'indices'. */
>>> };
>>>
>>> -/* Associates a metadata value (that is, a value of the OpenFlow 1.1+
>>> metadata
>>> - * field) with tags for the "cls_subtable"s that contain rules that match
>>> that
>>> - * metadata value. */
>>> -struct cls_partition {
>>> - struct hmap_node hmap_node; /* In struct classifier's 'partitions'
>>> hmap. */
>>> - ovs_be64 metadata; /* metadata value for this partition. */
>>> - tag_type tags; /* OR of each flow's cls_subtable tag. */
>>> - struct tag_tracker tracker; /* Tracks the bits in 'tags'. */
>>> -};
>>> -
>>> void cls_rule_init(struct cls_rule *, const struct match *,
>>> unsigned int priority);
>>> void cls_rule_init_from_minimatch(struct cls_rule *, const struct minimatch
>>> *,
>>> @@ -366,7 +319,7 @@ struct cls_rule *classifier_find_match_exactly(const
>>> struct classifier *cls,
>>> /* Iteration. */
>>>
>>> struct cls_cursor {
>>> - const struct classifier *cls;
>>> + const struct cls_classifier *cls;
>>> const struct cls_subtable *subtable;
>>> const struct cls_rule *target;
>>> };
>>> diff --git a/tests/test-classifier.c b/tests/test-classifier.c
>>> index 48eb8de..84f9367 100644
>>> --- a/tests/test-classifier.c
>>> +++ b/tests/test-classifier.c
>>> @@ -475,7 +475,7 @@ check_tables(const struct classifier *cls, int
>>> n_tables, int n_rules,
>>> int found_dups = 0;
>>> int found_rules2 = 0;
>>>
>>> - HMAP_FOR_EACH (table, hmap_node, &cls->subtables) {
>>> + HMAP_FOR_EACH (table, hmap_node, &cls->cls->subtables) {
>>> const struct cls_rule *head;
>>> unsigned int max_priority = 0;
>>> unsigned int max_count = 0;
>>> @@ -509,8 +509,8 @@ check_tables(const struct classifier *cls, int
>>> n_tables, int n_rules,
>>> assert(table->max_count == max_count);
>>> }
>>>
>>> - assert(found_tables == hmap_count(&cls->subtables));
>>> - assert(n_tables == -1 || n_tables == hmap_count(&cls->subtables));
>>> + assert(found_tables == hmap_count(&cls->cls->subtables));
>>> + assert(n_tables == -1 || n_tables == hmap_count(&cls->cls->subtables));
>>> assert(n_rules == -1 || found_rules == n_rules);
>>> assert(n_dups == -1 || found_dups == n_dups);
>>>
>>> --
>>> 1.7.10.4
>>>
>>> _______________________________________________
>>> dev mailing list
>>> dev@openvswitch.org
>>> http://openvswitch.org/mailman/listinfo/dev
>
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