From 4bf84c35c65f36a344fb7a6cde6274df4120efb8 Mon Sep 17 00:00:00 2001 From: Jiri Pirko Date: Thu, 27 Dec 2012 23:49:37 +0000 Subject: [PATCH] net: add change_carrier netdev op This allows a driver to register change_carrier callback which will be called whenever user will like to change carrier state. This is useful for devices like dummy, gre, team and so on. Signed-off-by: Jiri Pirko Acked-by: Flavio Leitner Signed-off-by: David S. Miller --- include/linux/netdevice.h | 12 ++++++++++++ net/core/dev.c | 19 +++++++++++++++++++ 2 files changed, 31 insertions(+) diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index c599e4782d45..0e1b92a0c1ec 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -891,6 +891,14 @@ struct netdev_fcoe_hbainfo { * int (*ndo_bridge_setlink)(struct net_device *dev, struct nlmsghdr *nlh) * int (*ndo_bridge_getlink)(struct sk_buff *skb, u32 pid, u32 seq, * struct net_device *dev) + * + * int (*ndo_change_carrier)(struct net_device *dev, bool new_carrier); + * Called to change device carrier. Soft-devices (like dummy, team, etc) + * which do not represent real hardware may define this to allow their + * userspace components to manage their virtual carrier state. Devices + * that determine carrier state from physical hardware properties (eg + * network cables) or protocol-dependent mechanisms (eg + * USB_CDC_NOTIFY_NETWORK_CONNECTION) should NOT implement this function. */ struct net_device_ops { int (*ndo_init)(struct net_device *dev); @@ -1008,6 +1016,8 @@ struct net_device_ops { int (*ndo_bridge_getlink)(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev); + int (*ndo_change_carrier)(struct net_device *dev, + bool new_carrier); }; /* @@ -2194,6 +2204,8 @@ extern int dev_set_mtu(struct net_device *, int); extern void dev_set_group(struct net_device *, int); extern int dev_set_mac_address(struct net_device *, struct sockaddr *); +extern int dev_change_carrier(struct net_device *, + bool new_carrier); extern int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev, struct netdev_queue *txq); diff --git a/net/core/dev.c b/net/core/dev.c index 515473ee52cb..21c5b976dcf3 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -5027,6 +5027,25 @@ int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa) } EXPORT_SYMBOL(dev_set_mac_address); +/** + * dev_change_carrier - Change device carrier + * @dev: device + * @new_carries: new value + * + * Change device carrier + */ +int dev_change_carrier(struct net_device *dev, bool new_carrier) +{ + const struct net_device_ops *ops = dev->netdev_ops; + + if (!ops->ndo_change_carrier) + return -EOPNOTSUPP; + if (!netif_device_present(dev)) + return -ENODEV; + return ops->ndo_change_carrier(dev, new_carrier); +} +EXPORT_SYMBOL(dev_change_carrier); + /* * Perform the SIOCxIFxxx calls, inside rcu_read_lock() */ -- 2.30.2