flow: Add new wildcard functions.

Rename the function flow_wildcards_combine() to flow_wildcards_and().
Add new flow_wildcards_or() and flow_hash_in_wildcards() functions.
These will be useful in a future patch.

Signed-off-by: Ethan Jackson <ethan@nicira.com>
Signed-off-by: Justin Pettit <jpettit@nicira.com>

lib/flow.c

@@ -604,11 +604,11 @@ flow_wildcards_is_catchall(const struct flow_wildcards *wc)
     return true;
 }
 
-/* Initializes 'dst' as the combination of wildcards in 'src1' and 'src2'.
+/* Sets 'dst' as the bitwise AND of wildcards in 'src1' and 'src2'.
- * That is, a bit or a field is wildcarded in 'dst' if it is wildcarded in
+ * That is, a bit or a field is wildcarded in 'dst' if it is wildcarded
- * 'src1' or 'src2' or both.  */
+ * in 'src1' or 'src2' or both.  */
 void
-flow_wildcards_combine(struct flow_wildcards *dst,
+flow_wildcards_and(struct flow_wildcards *dst,
                    const struct flow_wildcards *src1,
                    const struct flow_wildcards *src2)
 {
@@ -622,6 +622,24 @@ flow_wildcards_combine(struct flow_wildcards *dst,
     }
 }
 
+/* Sets 'dst' as the bitwise OR of wildcards in 'src1' and 'src2'.  That
+ * is, a bit or a field is wildcarded in 'dst' if it is neither
+ * wildcarded in 'src1' nor 'src2'. */
+void
+flow_wildcards_or(struct flow_wildcards *dst,
+                  const struct flow_wildcards *src1,
+                  const struct flow_wildcards *src2)
+{
+    uint32_t *dst_u32 = (uint32_t *) &dst->masks;
+    const uint32_t *src1_u32 = (const uint32_t *) &src1->masks;
+    const uint32_t *src2_u32 = (const uint32_t *) &src2->masks;
+    size_t i;
+
+    for (i = 0; i < FLOW_U32S; i++) {
+        dst_u32[i] = src1_u32[i] | src2_u32[i];
+    }
+}
+
 /* Perform a bitwise OR of miniflow 'src' flow data with the equivalent
  * fields in 'dst', storing the result in 'dst'. */
 static void
@@ -795,6 +813,24 @@ flow_hash_fields_valid(enum nx_hash_fields fields)
         || fields == NX_HASH_FIELDS_SYMMETRIC_L4;
 }
 
+/* Returns a hash value for the bits of 'flow' that are active based on
+ * 'wc', given 'basis'. */
+uint32_t
+flow_hash_in_wildcards(const struct flow *flow,
+                       const struct flow_wildcards *wc, uint32_t basis)
+{
+    const uint32_t *wc_u32 = (const uint32_t *) &wc->masks;
+    const uint32_t *flow_u32 = (const uint32_t *) flow;
+    uint32_t hash;
+    size_t i;
+
+    hash = basis;
+    for (i = 0; i < FLOW_U32S; i++) {
+        hash = mhash_add(hash, flow_u32[i] & wc_u32[i]);
+    }
+    return mhash_finish(hash, 4 * FLOW_U32S);
+}
+
 /* Sets the VLAN VID that 'flow' matches to 'vid', which is interpreted as an
  * OpenFlow 1.0 "dl_vlan" value:
  *

lib/flow.h

@@ -190,7 +190,10 @@ bool flow_wildcards_is_catchall(const struct flow_wildcards *);
 void flow_wildcards_set_reg_mask(struct flow_wildcards *,
                                  int idx, uint32_t mask);
 
-void flow_wildcards_combine(struct flow_wildcards *dst,
+void flow_wildcards_and(struct flow_wildcards *dst,
+                        const struct flow_wildcards *src1,
+                        const struct flow_wildcards *src2);
+void flow_wildcards_or(struct flow_wildcards *dst,
                        const struct flow_wildcards *src1,
                        const struct flow_wildcards *src2);
 bool flow_wildcards_has_extra(const struct flow_wildcards *,
@@ -209,6 +212,10 @@ uint32_t flow_hash_fields(const struct flow *, enum nx_hash_fields,
 const char *flow_hash_fields_to_str(enum nx_hash_fields);
 bool flow_hash_fields_valid(enum nx_hash_fields);
 
+uint32_t flow_hash_in_wildcards(const struct flow *,
+                                const struct flow_wildcards *,
+                                uint32_t basis);
+
 bool flow_equal_except(const struct flow *a, const struct flow *b,
                        const struct flow_wildcards *);
 

tests/test-classifier.c

@@ -1279,7 +1279,7 @@ test_minimask_combine(int argc OVS_UNUSED, char *argv[] OVS_UNUSED)
         minimask_init(&minimask2, &mask2);
 
         minimask_combine(&minicombined, &minimask, &minimask2, storage);
-        flow_wildcards_combine(&combined, &mask, &mask2);
+        flow_wildcards_and(&combined, &mask, &mask2);
         minimask_expand(&minicombined, &combined2);
         assert(flow_wildcards_equal(&combined, &combined2));