[ovs-dev] [overload 6/7] classifier: Introduce macros for iterating exact-match flows.

[Ben Pfaff]

This special case of iterating through flows is easier and presumably
faster to implement using a macro.
---
 lib/classifier.c  |    5 ++++-
 lib/classifier.h  |    7 +++++++
 ofproto/ofproto.c |   18 ++++++------------
 3 files changed, 17 insertions(+), 13 deletions(-)

diff --git a/lib/classifier.c b/lib/classifier.c
index 378faf8..8e5c1a6 100644
--- a/lib/classifier.c
+++ b/lib/classifier.c
@@ -465,7 +465,10 @@ classifier_for_each_match(const struct classifier *cls,
  * it must not delete (or move) any other rules in 'cls' that are in the same
  * table as the argument rule.  Two rules are in the same table if their
  * cls_rule structs have the same table_idx; as a special case, a rule with
- * wildcards and an exact-match rule will never be in the same table. */
+ * wildcards and an exact-match rule will never be in the same table.
+ *
+ * If 'include' is CLS_INC_EXACT then CLASSIFIER_FOR_EACH_EXACT_RULE(_SAFE) is
+ * probably easier to use. */
 void
 classifier_for_each(const struct classifier *cls, int include,
                     void (*callback)(struct cls_rule *, void *aux),
diff --git a/lib/classifier.h b/lib/classifier.h
index f522f0e..24a3563 100644
--- a/lib/classifier.h
+++ b/lib/classifier.h
@@ -168,4 +168,11 @@ struct cls_rule *classifier_find_rule_exactly(const struct classifier *,
                                               uint32_t wildcards,
                                               unsigned int priority);
 
+#define CLASSIFIER_FOR_EACH_EXACT_RULE(RULE, STRUCT, MEMBER, CLS)   \
+        HMAP_FOR_EACH (RULE, STRUCT, MEMBER.node.hmap, &(CLS)->exact_table)
+
+#define CLASSIFIER_FOR_EACH_EXACT_RULE_SAFE(RULE, NEXT, CLS) \
+        HMAP_FOR_EACH_SAFE (RULE, NEXT, STRUCT, MEMBER.node.hmap, \
+                            &(CLS)->exact_table)
+
 #endif /* classifier.h */
diff --git a/ofproto/ofproto.c b/ofproto/ofproto.c
index 0f07b23..87034ad 100644
--- a/ofproto/ofproto.c
+++ b/ofproto/ofproto.c
@@ -3007,17 +3007,6 @@ handle_desc_stats_request(struct ofproto *p, struct ofconn *ofconn,
     return 0;
 }
 
-static void
-count_subrules(struct cls_rule *cls_rule, void *n_subrules_)
-{
-    struct rule *rule = rule_from_cls_rule(cls_rule);
-    int *n_subrules = n_subrules_;
-
-    if (rule->super) {
-        (*n_subrules)++;
-    }
-}
-
 static int
 handle_table_stats_request(struct ofproto *p, struct ofconn *ofconn,
                            struct ofp_stats_request *request)
@@ -3026,12 +3015,17 @@ handle_table_stats_request(struct ofproto *p, struct ofconn *ofconn,
     struct ofpbuf *msg;
     struct odp_stats dpstats;
     int n_exact, n_subrules, n_wild;
+    struct rule *rule;
 
     msg = start_stats_reply(request, sizeof *ots * 2);
 
     /* Count rules of various kinds. */
     n_subrules = 0;
-    classifier_for_each(&p->cls, CLS_INC_EXACT, count_subrules, &n_subrules);
+    CLASSIFIER_FOR_EACH_EXACT_RULE (rule, struct rule, cr, &p->cls) {
+        if (rule->super) {
+            n_subrules++;
+        }
+    }
     n_exact = classifier_count_exact(&p->cls) - n_subrules;
     n_wild = classifier_count(&p->cls) - classifier_count_exact(&p->cls);
 
-- 
1.7.1