dpif: Make dpif_port_query_by_name() more useful by logging less on failure.

One potential user of dpif_port_query_by_name() actually open-coded the
function because it didn't want logging on failure.  There was only one
actual caller of the function, which didn't want logging on failure either.
So, clean up by reducing the failure log level to DBG and making the
open-coded version an actual caller.

diff --git a/lib/dpif.c b/lib/dpif.c
index 7cfe2a7..646d2a7 100644 (file)
--- a/lib/dpif.c
+++ b/lib/dpif.c
@@ -307,8 +307,11 @@ dpif_port_query_by_name(const struct dpif *dpif, const char *devname,
                     dpif_name(dpif), devname, port->port);
         return 0;
     } else {
-        VLOG_WARN_RL(&error_rl, "%s: failed to query port %s: %s",
-                     dpif_name(dpif), devname, strerror(errno));
+        /* Log level is DBG here because all the current callers are interested
+         * in whether 'dpif' actually has a port 'devname', so that it's not an
+         * issue worth logging if it doesn't. */
+        VLOG_DBG_RL(&error_rl, "%s: failed to query port %s: %s",
+                    dpif_name(dpif), devname, strerror(errno));
         return errno;
     }
 }
@@ -784,13 +787,9 @@ again:
                 uint32_t master_ifindex = nl_attr_get_u32(attrs[IFLA_MASTER]);
                 for_us = master_ifindex == mon->local_ifindex;
             } else {
-                /* It's for us if that device is one of our ports.  This is
-                 * open-coded instead of using dpif_port_query_by_name() to
-                 * avoid logging a warning on failure. */
+                /* It's for us if that device is one of our ports. */
                 struct odp_port port;
-                memset(&port, 0, sizeof port);
-                strncpy(port.devname, devname, sizeof port.devname);
-                for_us = !ioctl(mon->dpif.fd, ODP_PORT_QUERY, &port);
+                for_us = !dpif_port_query_by_name(mon->dpif, devname, &port);
             }
 
             if (!for_us) {