X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;ds=sidebyside;f=lib%2Fnetdev.c;h=a15315a79019ca5062a07b7796d0ff3476fad97f;hb=f4b6076acab233cfe02e7eaefdeafbb69dfae556;hp=4741e24b3aff78b03b5a0e5a91f15cfde5cb3743;hpb=4c0f178060b740faac9a5aec915a24dc3b61770c;p=openvswitch

diff --git a/lib/netdev.c b/lib/netdev.c
index 4741e24b..a15315a7 100644
--- a/lib/netdev.c
+++ b/lib/netdev.c
@@ -42,10 +42,12 @@
 #include "vlog.h"
 
 static const struct netdev_class *base_netdev_classes[] = {
+#ifdef HAVE_NETLINK
     &netdev_linux_class,
     &netdev_tap_class,
-    &netdev_gre_class,
     &netdev_patch_class,
+    &netdev_gre_class,
+#endif
 };
 
 static struct shash netdev_classes = SHASH_INITIALIZER(&netdev_classes);
@@ -263,12 +265,6 @@ create_device(struct netdev_options *options, struct netdev_dev **netdev_devp)
 {
     struct netdev_class *netdev_class;
 
-    if (!options->may_create) {
-        VLOG_WARN("attempted to create a device that may not be created: %s",
-                  options->name);
-        return ENODEV;
-    }
-
     if (!options->type || strlen(options->type) == 0) {
         /* Default to system. */
         options->type = "system";
@@ -295,15 +291,7 @@ create_device(struct netdev_options *options, struct netdev_dev **netdev_devp)
  * 'ethertype' may be a 16-bit Ethernet protocol value in host byte order to
  * capture frames of that type received on the device.  It may also be one of
  * the 'enum netdev_pseudo_ethertype' values to receive frames in one of those
- * categories.
- *
- * If the 'may_create' flag is set then this is allowed to be the first time
- * the device is opened (i.e. the refcount will be 1 after this call).  It
- * may be set to false if the device should have already been created.
- *
- * If the 'may_open' flag is set then the call will succeed even if another
- * caller has already opened it.  It may be to false if the device should not
- * currently be open. */
+ * categories. */
 
 int
 netdev_open(struct netdev_options *options, struct netdev **netdevp)
@@ -328,18 +316,12 @@ netdev_open(struct netdev_options *options, struct netdev **netdevp)
         }
         update_device_args(netdev_dev, options->args);
 
-    } else if (options->may_open) {
-        if (!shash_is_empty(options->args) &&
-            !compare_device_args(netdev_dev, options->args)) {
+    } else if (!shash_is_empty(options->args) &&
+               !compare_device_args(netdev_dev, options->args)) {
 
-            VLOG_WARN("%s: attempted to open already created netdev with "
-                      "different arguments", options->name);
-            return EINVAL;
-        }
-    } else {
-        VLOG_WARN("%s: attempted to create a netdev device with bound name",
-                  options->name);
-        return EEXIST;
+        VLOG_WARN("%s: attempted to open already open netdev with "
+                  "different arguments", options->name);
+        return EINVAL;
     }
 
     error = netdev_dev->netdev_class->open(netdev_dev, options->ethertype, 
@@ -362,11 +344,8 @@ netdev_open_default(const char *name, struct netdev **netdevp)
     struct netdev_options options;
 
     memset(&options, 0, sizeof options);
-
     options.name = name;
     options.ethertype = NETDEV_ETH_TYPE_NONE;
-    options.may_create = true;
-    options.may_open = true;
 
     return netdev_open(&options, netdevp);
 }
@@ -958,6 +937,19 @@ netdev_get_stats(const struct netdev *netdev, struct netdev_stats *stats)
     return error;
 }
 
+/* Attempts to change the stats for 'netdev' to those provided in 'stats'.
+ * Returns 0 if successful, otherwise a positive errno value.
+ *
+ * This will probably fail for most network devices.  Some devices might only
+ * allow setting their stats to 0. */
+int
+netdev_set_stats(struct netdev *netdev, const struct netdev_stats *stats)
+{
+    return (netdev_get_dev(netdev)->netdev_class->set_stats
+             ? netdev_get_dev(netdev)->netdev_class->set_stats(netdev, stats)
+             : EOPNOTSUPP);
+}
+
 /* Attempts to set input rate limiting (policing) policy, such that up to
  * 'kbits_rate' kbps of traffic is accepted, with a maximum accumulative burst
  * size of 'kbits' kb. */