[NET] core: add RFC2863 operstate
this patch adds a dormant flag to network devices, RFC2863 operstate derived
from these flags and possibility for userspace interaction. It allows drivers
to signal that a device is unusable for user traffic without disabling
queueing (and therefore the possibility for protocol establishment traffic to
flow) and a userspace supplicant (WPA, 802.1X) to mark a device unusable
without changes to the driver.
It is the result of our long discussion. However I must admit that it
represents what Jamal and I agreed on with compromises towards Krzysztof, but
Thomas and Krzysztof still disagree with some parts. Anyway I think it should
be applied.
Signed-off-by: Stefan Rompf <stefan@loplof.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 7fda03d..b825be2 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -230,7 +230,8 @@
__LINK_STATE_SCHED,
__LINK_STATE_NOCARRIER,
__LINK_STATE_RX_SCHED,
- __LINK_STATE_LINKWATCH_PENDING
+ __LINK_STATE_LINKWATCH_PENDING,
+ __LINK_STATE_DORMANT,
};
@@ -335,11 +336,14 @@
*/
- unsigned short flags; /* interface flags (a la BSD) */
+ unsigned int flags; /* interface flags (a la BSD) */
unsigned short gflags;
unsigned short priv_flags; /* Like 'flags' but invisible to userspace. */
unsigned short padded; /* How much padding added by alloc_netdev() */
+ unsigned char operstate; /* RFC2863 operstate */
+ unsigned char link_mode; /* mapping policy to operstate */
+
unsigned mtu; /* interface MTU value */
unsigned short type; /* interface hardware type */
unsigned short hard_header_len; /* hardware hdr length */
@@ -714,6 +718,10 @@
/* Carrier loss detection, dial on demand. The functions netif_carrier_on
* and _off may be called from IRQ context, but it is caller
* who is responsible for serialization of these calls.
+ *
+ * The name carrier is inappropriate, these functions should really be
+ * called netif_lowerlayer_*() because they represent the state of any
+ * kind of lower layer not just hardware media.
*/
extern void linkwatch_fire_event(struct net_device *dev);
@@ -729,6 +737,29 @@
extern void netif_carrier_off(struct net_device *dev);
+static inline void netif_dormant_on(struct net_device *dev)
+{
+ if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state))
+ linkwatch_fire_event(dev);
+}
+
+static inline void netif_dormant_off(struct net_device *dev)
+{
+ if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state))
+ linkwatch_fire_event(dev);
+}
+
+static inline int netif_dormant(const struct net_device *dev)
+{
+ return test_bit(__LINK_STATE_DORMANT, &dev->state);
+}
+
+
+static inline int netif_oper_up(const struct net_device *dev) {
+ return (dev->operstate == IF_OPER_UP ||
+ dev->operstate == IF_OPER_UNKNOWN /* backward compat */);
+}
+
/* Hot-plugging. */
static inline int netif_device_present(struct net_device *dev)
{