[patch net-next 11/26] net: introduce change lower state notifier

Jiri Pirko
2015-12-01T13:49:22Z

From: Jiri Pirko <jiri@mellanox.com>

When lower device like bonding slave, team/bridge port, etc changes its
state, it is useful for others to notice this change. Currently this is
implemented specificly for bonding as NETDEV_BONDING_INFO notifier. This
patch aims to replace this specific usage and make this more generic to
be used for all upper-lower devices.

Introduce NETDEV_CHANGELOWERSTATE netdev notifier type and
netdev_lower_state_changed() helper.

Signed-off-by: Jiri Pirko <jiri@mellanox.com>
---
include/linux/netdevice.h | 8 ++++++++
net/core/dev.c | 20 ++++++++++++++++++++
2 files changed, 28 insertions(+)

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 7ea3e83..06f17a4 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -2156,6 +2156,7 @@ struct netdev_lag_upper_info {
#define NETDEV_CHANGEINFODATA 0x0018
#define NETDEV_BONDING_INFO 0x0019
#define NETDEV_PRECHANGEUPPER 0x001A
+#define NETDEV_CHANGELOWERSTATE 0x001B

int register_netdevice_notifier(struct notifier_block *nb);
int unregister_netdevice_notifier(struct notifier_block *nb);
@@ -2177,6 +2178,11 @@ struct netdev_notifier_changeupper_info {
void *upper_info; /* is upper dev info */
};

+struct netdev_notifier_changelowerstate_info {
+ struct netdev_notifier_info info; /* must be first */
+ void *lower_state_info; /* is lower dev state */
+};
+
static inline void netdev_notifier_info_init(struct netdev_notifier_info *info,
struct net_device *dev)
{
@@ -3638,6 +3644,8 @@ void netdev_upper_dev_unlink(struct net_device *dev,
void netdev_adjacent_rename_links(struct net_device *dev, char *oldname);
void *netdev_lower_dev_get_private(struct net_device *dev,
struct net_device *lower_dev);
+void netdev_lower_state_changed(struct net_device *lower_dev,
+ void *lower_state_info);

/* RSS keys are 40 or 52 bytes long */
#define NETDEV_RSS_KEY_LEN 52
diff --git a/net/core/dev.c b/net/core/dev.c
index 3fe1ce2..caac143 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -5752,6 +5752,26 @@ int dev_get_nest_level(struct net_device *dev,
}
EXPORT_SYMBOL(dev_get_nest_level);

+/**
+ * netdev_lower_change - Dispatch event about lower device state change
+ * @lower_dev: device
+ * @lower_state_info: state to dispatch
+ *
+ * Send NETDEV_CHANGELOWERSTATE to netdev notifiers with info.
+ * The caller must hold the RTNL lock.
+ */
+void netdev_lower_state_changed(struct net_device *lower_dev,
+ void *lower_state_info)
+{
+ struct netdev_notifier_changelowerstate_info changelowerstate_info;
+
+ ASSERT_RTNL();
+ changelowerstate_info.lower_state_info = lower_state_info;
+ call_netdevice_notifiers_info(NETDEV_CHANGELOWERSTATE, lower_dev,
+ &changelowerstate_info.info);
+}
+EXPORT_SYMBOL(netdev_lower_state_changed);
+
static void dev_change_rx_flags(struct net_device *dev, int flags)
{
const struct net_device_ops *ops = dev->netdev_ops;
--
1.9.3