Initial implementation of sFlow.

[sliver-openvswitch.git] / lib / dpif-provider.h

diff --git a/lib/dpif-provider.h b/lib/dpif-provider.h
index bd159b2..eade868 100644 (file)
--- a/lib/dpif-provider.h
+++ b/lib/dpif-provider.h
@@ -42,7 +42,7 @@ static inline void dpif_assert_class(const struct dpif *dpif,
 }
 
 /* Datapath interface class structure, to be defined by each implementation of
- * a datapath interface
+ * a datapath interface.
  *
  * These functions return 0 if successful or a positive errno value on failure,
  * except where otherwise noted.
@@ -52,7 +52,7 @@ static inline void dpif_assert_class(const struct dpif *dpif,
  * EWOULDBLOCK or EINPROGRESS.  We may relax this requirement in the future if
  * and when we encounter performance problems. */
 struct dpif_class {
-    /* Prefix for names of dpifs in this class, e.g. "udatapath:".
+    /* Prefix for names of dpifs in this class, e.g. "netdev:".
      *
      * One dpif class may have the empty string "" as its prefix, in which case
      * that dpif class is associated with dpif names that don't match any other
@@ -278,6 +278,23 @@ struct dpif_class {
      * corresponding type when it calls the recv member function. */
     int (*recv_set_mask)(struct dpif *dpif, int listen_mask);
 
+    /* Retrieves 'dpif''s sFlow sampling probability into '*probability'.
+     * Return value is 0 or a positive errno value.  EOPNOTSUPP indicates that
+     * the datapath does not support sFlow, as does a null pointer.
+     *
+     * A probability of 0 means sample no packets, UINT32_MAX means sample
+     * every packet, and other values are intermediate probabilities. */
+    int (*get_sflow_probability)(const struct dpif *dpif,
+                                 uint32_t *probability);
+
+    /* Sets 'dpif''s sFlow sampling probability to 'probability'.  Return value
+     * is 0 or a positive errno value.  EOPNOTSUPP indicates that the datapath
+     * does not support sFlow, as does a null pointer.
+     *
+     * A probability of 0 means sample no packets, UINT32_MAX means sample
+     * every packet, and other values are intermediate probabilities. */
+    int (*set_sflow_probability)(struct dpif *dpif, uint32_t probability);
+
     /* Attempts to receive a message from 'dpif'.  If successful, stores the
      * message into '*packetp'.  The message, if one is received, must begin
      * with 'struct odp_msg' as a header.  Only messages of the types selected