forked from Minki/linux
03bf0c2812
This patch introduces new notifier for purposes of exposing events which happen on switch driver side. The consumers of the event messages are mainly involved masters, namely bridge and ovs. Suggested-by: Thomas Graf <tgraf@suug.ch> Signed-off-by: Jiri Pirko <jiri@resnulli.us> Signed-off-by: Scott Feldman <sfeldma@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
118 lines
3.3 KiB
C
118 lines
3.3 KiB
C
/*
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* net/switchdev/switchdev.c - Switch device API
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* Copyright (c) 2014 Jiri Pirko <jiri@resnulli.us>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/mutex.h>
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#include <linux/notifier.h>
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#include <linux/netdevice.h>
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#include <net/switchdev.h>
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/**
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* netdev_switch_parent_id_get - Get ID of a switch
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* @dev: port device
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* @psid: switch ID
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*
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* Get ID of a switch this port is part of.
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*/
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int netdev_switch_parent_id_get(struct net_device *dev,
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struct netdev_phys_item_id *psid)
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{
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const struct net_device_ops *ops = dev->netdev_ops;
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if (!ops->ndo_switch_parent_id_get)
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return -EOPNOTSUPP;
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return ops->ndo_switch_parent_id_get(dev, psid);
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}
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EXPORT_SYMBOL(netdev_switch_parent_id_get);
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/**
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* netdev_switch_port_stp_update - Notify switch device port of STP
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* state change
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* @dev: port device
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* @state: port STP state
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*
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* Notify switch device port of bridge port STP state change.
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*/
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int netdev_switch_port_stp_update(struct net_device *dev, u8 state)
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{
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const struct net_device_ops *ops = dev->netdev_ops;
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if (!ops->ndo_switch_port_stp_update)
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return -EOPNOTSUPP;
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WARN_ON(!ops->ndo_switch_parent_id_get);
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return ops->ndo_switch_port_stp_update(dev, state);
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}
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EXPORT_SYMBOL(netdev_switch_port_stp_update);
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static DEFINE_MUTEX(netdev_switch_mutex);
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static RAW_NOTIFIER_HEAD(netdev_switch_notif_chain);
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/**
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* register_netdev_switch_notifier - Register nofifier
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* @nb: notifier_block
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*
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* Register switch device notifier. This should be used by code
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* which needs to monitor events happening in particular device.
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* Return values are same as for atomic_notifier_chain_register().
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*/
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int register_netdev_switch_notifier(struct notifier_block *nb)
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{
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int err;
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mutex_lock(&netdev_switch_mutex);
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err = raw_notifier_chain_register(&netdev_switch_notif_chain, nb);
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mutex_unlock(&netdev_switch_mutex);
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return err;
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}
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EXPORT_SYMBOL(register_netdev_switch_notifier);
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/**
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* unregister_netdev_switch_notifier - Unregister nofifier
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* @nb: notifier_block
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*
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* Unregister switch device notifier.
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* Return values are same as for atomic_notifier_chain_unregister().
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*/
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int unregister_netdev_switch_notifier(struct notifier_block *nb)
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{
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int err;
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mutex_lock(&netdev_switch_mutex);
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err = raw_notifier_chain_unregister(&netdev_switch_notif_chain, nb);
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mutex_unlock(&netdev_switch_mutex);
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return err;
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}
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EXPORT_SYMBOL(unregister_netdev_switch_notifier);
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/**
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* call_netdev_switch_notifiers - Call nofifiers
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* @val: value passed unmodified to notifier function
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* @dev: port device
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* @info: notifier information data
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*
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* Call all network notifier blocks. This should be called by driver
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* when it needs to propagate hardware event.
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* Return values are same as for atomic_notifier_call_chain().
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*/
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int call_netdev_switch_notifiers(unsigned long val, struct net_device *dev,
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struct netdev_switch_notifier_info *info)
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{
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int err;
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info->dev = dev;
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mutex_lock(&netdev_switch_mutex);
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err = raw_notifier_call_chain(&netdev_switch_notif_chain, val, info);
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mutex_unlock(&netdev_switch_mutex);
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return err;
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}
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EXPORT_SYMBOL(call_netdev_switch_notifiers);
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