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authorStephen Hemminger <shemminger@osdl.org>2005-12-20 15:19:51 -0800
committerDavid S. Miller <davem@sunset.davemloft.net>2006-01-03 13:11:01 -0800
commit4433f420e57afae0ab308b1e2b979f09c86bc115 (patch)
tree3481cdce9a8ba28ba8ad26d0ed49151c1d08f4b7
parent4505a3ef720845b5db3ddb440de13cd4800fd508 (diff)
[BRIDGE]: handle speed detection after carrier changes
Speed of a interface may not be available until carrier is detected in the case of autonegotiation. To get the correct value we need to recheck speed after carrier event. But the check needs to be done in a context that is similar to normal ethtool interface (can sleep). Also, delay check for 1ms to try avoid any carrier bounce transitions. Signed-off-by: Stephen Hemminger <shemminger@osdl.org> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/bridge/br_if.c49
-rw-r--r--net/bridge/br_notify.c14
-rw-r--r--net/bridge/br_private.h3
3 files changed, 44 insertions, 22 deletions
diff --git a/net/bridge/br_if.c b/net/bridge/br_if.c
index 975abe254b7..e6b8bb51d61 100644
--- a/net/bridge/br_if.c
+++ b/net/bridge/br_if.c
@@ -32,9 +32,8 @@
* ethtool, use ethtool_ops. Also, since driver might sleep need to
* not be holding any locks.
*/
-static int br_initial_port_cost(struct net_device *dev)
+static int port_cost(struct net_device *dev)
{
-
struct ethtool_cmd ecmd = { ETHTOOL_GSET };
struct ifreq ifr;
mm_segment_t old_fs;
@@ -58,10 +57,6 @@ static int br_initial_port_cost(struct net_device *dev)
return 2;
case SPEED_10:
return 100;
- default:
- pr_info("bridge: can't decode speed from %s: %d\n",
- dev->name, ecmd.speed);
- return 100;
}
}
@@ -75,6 +70,35 @@ static int br_initial_port_cost(struct net_device *dev)
return 100; /* assume old 10Mbps */
}
+
+/*
+ * Check for port carrier transistions.
+ * Called from work queue to allow for calling functions that
+ * might sleep (such as speed check), and to debounce.
+ */
+static void port_carrier_check(void *arg)
+{
+ struct net_bridge_port *p = arg;
+
+ rtnl_lock();
+ if (netif_carrier_ok(p->dev)) {
+ u32 cost = port_cost(p->dev);
+
+ spin_lock_bh(&p->br->lock);
+ if (p->state == BR_STATE_DISABLED) {
+ p->path_cost = cost;
+ br_stp_enable_port(p);
+ }
+ spin_unlock_bh(&p->br->lock);
+ } else {
+ spin_lock_bh(&p->br->lock);
+ if (p->state != BR_STATE_DISABLED)
+ br_stp_disable_port(p);
+ spin_unlock_bh(&p->br->lock);
+ }
+ rtnl_unlock();
+}
+
static void destroy_nbp(struct net_bridge_port *p)
{
struct net_device *dev = p->dev;
@@ -102,6 +126,9 @@ static void del_nbp(struct net_bridge_port *p)
dev->br_port = NULL;
dev_set_promiscuity(dev, -1);
+ cancel_delayed_work(&p->carrier_check);
+ flush_scheduled_work();
+
spin_lock_bh(&br->lock);
br_stp_disable_port(p);
spin_unlock_bh(&br->lock);
@@ -195,10 +222,9 @@ static int find_portno(struct net_bridge *br)
return (index >= BR_MAX_PORTS) ? -EXFULL : index;
}
-/* called with RTNL */
+/* called with RTNL but without bridge lock */
static struct net_bridge_port *new_nbp(struct net_bridge *br,
- struct net_device *dev,
- unsigned long cost)
+ struct net_device *dev)
{
int index;
struct net_bridge_port *p;
@@ -215,12 +241,13 @@ static struct net_bridge_port *new_nbp(struct net_bridge *br,
p->br = br;
dev_hold(dev);
p->dev = dev;
- p->path_cost = cost;
+ p->path_cost = port_cost(dev);
p->priority = 0x8000 >> BR_PORT_BITS;
dev->br_port = p;
p->port_no = index;
br_init_port(p);
p->state = BR_STATE_DISABLED;
+ INIT_WORK(&p->carrier_check, port_carrier_check, p);
kobject_init(&p->kobj);
return p;
@@ -351,7 +378,7 @@ int br_add_if(struct net_bridge *br, struct net_device *dev)
if (dev->br_port != NULL)
return -EBUSY;
- if (IS_ERR(p = new_nbp(br, dev, br_initial_port_cost(dev))))
+ if (IS_ERR(p = new_nbp(br, dev)))
return PTR_ERR(p);
if ((err = br_fdb_insert(br, p, dev->dev_addr)))
diff --git a/net/bridge/br_notify.c b/net/bridge/br_notify.c
index 917311c6828..a43a9c1d50d 100644
--- a/net/bridge/br_notify.c
+++ b/net/bridge/br_notify.c
@@ -52,17 +52,9 @@ static int br_device_event(struct notifier_block *unused, unsigned long event, v
br_stp_recalculate_bridge_id(br);
break;
- case NETDEV_CHANGE: /* device is up but carrier changed */
- if (!(br->dev->flags & IFF_UP))
- break;
-
- if (netif_carrier_ok(dev)) {
- if (p->state == BR_STATE_DISABLED)
- br_stp_enable_port(p);
- } else {
- if (p->state != BR_STATE_DISABLED)
- br_stp_disable_port(p);
- }
+ case NETDEV_CHANGE:
+ if (br->dev->flags & IFF_UP)
+ schedule_delayed_work(&p->carrier_check, BR_PORT_DEBOUNCE);
break;
case NETDEV_FEAT_CHANGE:
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 2c249486476..7ad53c2aa68 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -27,6 +27,8 @@
#define BR_PORT_BITS 10
#define BR_MAX_PORTS (1<<BR_PORT_BITS)
+#define BR_PORT_DEBOUNCE (HZ/10)
+
typedef struct bridge_id bridge_id;
typedef struct mac_addr mac_addr;
typedef __u16 port_id;
@@ -78,6 +80,7 @@ struct net_bridge_port
struct timer_list hold_timer;
struct timer_list message_age_timer;
struct kobject kobj;
+ struct work_struct carrier_check;
struct rcu_head rcu;
};