X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=lib%2Fdpif-provider.h;h=317e61706729d5959d5ee6732105351f7806ac6b;hb=f702893a7cc2380b2640e1ccb3a987d46766c685;hp=0641d30696c8d26374cb437aa467b1ebe3fd296f;hpb=625b07205a37dd8c7a8b53b2e53e5f0b55203b38;p=openvswitch

diff --git a/lib/dpif-provider.h b/lib/dpif-provider.h
index 0641d306..317e6170 100644
--- a/lib/dpif-provider.h
+++ b/lib/dpif-provider.h
@@ -110,8 +110,12 @@ struct dpif_class {
     /* Retrieves statistics for 'dpif' into 'stats'. */
     int (*get_stats)(const struct dpif *dpif, struct dpif_dp_stats *stats);
 
-    /* Adds 'netdev' as a new port in 'dpif'.  If successful, sets '*port_no'
-     * to the new port's port number. */
+    /* Adds 'netdev' as a new port in 'dpif'.  If '*port_no' is not
+     * UINT16_MAX, attempts to use that as the port's port number.
+     *
+     * If port is successfully added, sets '*port_no' to the new port's
+     * port number.  Returns EBUSY if caller attempted to choose a port
+     * number, and it was in use. */
     int (*port_add)(struct dpif *dpif, struct netdev *netdev,
                     uint16_t *port_no);