396 lines
10 KiB
C
396 lines
10 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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* Copyright (c) 2014-2015 Scott Feldman <sfeldma@gmail.com>
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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/ip_fib.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_GPL(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_GPL(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 notifier
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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_GPL(register_netdev_switch_notifier);
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/**
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* unregister_netdev_switch_notifier - Unregister notifier
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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_GPL(unregister_netdev_switch_notifier);
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/**
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* call_netdev_switch_notifiers - Call notifiers
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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_GPL(call_netdev_switch_notifiers);
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/**
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* netdev_switch_port_bridge_setlink - Notify switch device port of bridge
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* port attributes
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*
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* @dev: port device
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* @nlh: netlink msg with bridge port attributes
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* @flags: bridge setlink flags
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*
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* Notify switch device port of bridge port attributes
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*/
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int netdev_switch_port_bridge_setlink(struct net_device *dev,
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struct nlmsghdr *nlh, u16 flags)
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{
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const struct net_device_ops *ops = dev->netdev_ops;
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if (!(dev->features & NETIF_F_HW_SWITCH_OFFLOAD))
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return 0;
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if (!ops->ndo_bridge_setlink)
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return -EOPNOTSUPP;
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return ops->ndo_bridge_setlink(dev, nlh, flags);
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}
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EXPORT_SYMBOL_GPL(netdev_switch_port_bridge_setlink);
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/**
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* netdev_switch_port_bridge_dellink - Notify switch device port of bridge
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* port attribute delete
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*
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* @dev: port device
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* @nlh: netlink msg with bridge port attributes
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* @flags: bridge setlink flags
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*
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* Notify switch device port of bridge port attribute delete
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*/
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int netdev_switch_port_bridge_dellink(struct net_device *dev,
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struct nlmsghdr *nlh, u16 flags)
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{
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const struct net_device_ops *ops = dev->netdev_ops;
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if (!(dev->features & NETIF_F_HW_SWITCH_OFFLOAD))
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return 0;
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if (!ops->ndo_bridge_dellink)
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return -EOPNOTSUPP;
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return ops->ndo_bridge_dellink(dev, nlh, flags);
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}
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EXPORT_SYMBOL_GPL(netdev_switch_port_bridge_dellink);
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/**
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* ndo_dflt_netdev_switch_port_bridge_setlink - default ndo bridge setlink
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* op for master devices
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*
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* @dev: port device
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* @nlh: netlink msg with bridge port attributes
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* @flags: bridge setlink flags
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*
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* Notify master device slaves of bridge port attributes
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*/
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int ndo_dflt_netdev_switch_port_bridge_setlink(struct net_device *dev,
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struct nlmsghdr *nlh, u16 flags)
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{
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struct net_device *lower_dev;
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struct list_head *iter;
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int ret = 0, err = 0;
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if (!(dev->features & NETIF_F_HW_SWITCH_OFFLOAD))
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return ret;
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netdev_for_each_lower_dev(dev, lower_dev, iter) {
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err = netdev_switch_port_bridge_setlink(lower_dev, nlh, flags);
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if (err && err != -EOPNOTSUPP)
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ret = err;
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}
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return ret;
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}
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EXPORT_SYMBOL_GPL(ndo_dflt_netdev_switch_port_bridge_setlink);
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/**
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* ndo_dflt_netdev_switch_port_bridge_dellink - default ndo bridge dellink
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* op for master devices
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*
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* @dev: port device
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* @nlh: netlink msg with bridge port attributes
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* @flags: bridge dellink flags
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*
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* Notify master device slaves of bridge port attribute deletes
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*/
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int ndo_dflt_netdev_switch_port_bridge_dellink(struct net_device *dev,
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struct nlmsghdr *nlh, u16 flags)
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{
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struct net_device *lower_dev;
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struct list_head *iter;
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int ret = 0, err = 0;
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if (!(dev->features & NETIF_F_HW_SWITCH_OFFLOAD))
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return ret;
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netdev_for_each_lower_dev(dev, lower_dev, iter) {
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err = netdev_switch_port_bridge_dellink(lower_dev, nlh, flags);
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if (err && err != -EOPNOTSUPP)
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ret = err;
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}
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return ret;
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}
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EXPORT_SYMBOL_GPL(ndo_dflt_netdev_switch_port_bridge_dellink);
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static struct net_device *netdev_switch_get_lowest_dev(struct net_device *dev)
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{
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const struct net_device_ops *ops = dev->netdev_ops;
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struct net_device *lower_dev;
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struct net_device *port_dev;
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struct list_head *iter;
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/* Recusively search down until we find a sw port dev.
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* (A sw port dev supports ndo_switch_parent_id_get).
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*/
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if (dev->features & NETIF_F_HW_SWITCH_OFFLOAD &&
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ops->ndo_switch_parent_id_get)
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return dev;
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netdev_for_each_lower_dev(dev, lower_dev, iter) {
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port_dev = netdev_switch_get_lowest_dev(lower_dev);
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if (port_dev)
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return port_dev;
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}
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return NULL;
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}
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static struct net_device *netdev_switch_get_dev_by_nhs(struct fib_info *fi)
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{
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struct netdev_phys_item_id psid;
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struct netdev_phys_item_id prev_psid;
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struct net_device *dev = NULL;
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int nhsel;
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/* For this route, all nexthop devs must be on the same switch. */
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for (nhsel = 0; nhsel < fi->fib_nhs; nhsel++) {
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const struct fib_nh *nh = &fi->fib_nh[nhsel];
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if (!nh->nh_dev)
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return NULL;
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dev = netdev_switch_get_lowest_dev(nh->nh_dev);
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if (!dev)
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return NULL;
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if (netdev_switch_parent_id_get(dev, &psid))
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return NULL;
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if (nhsel > 0) {
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if (prev_psid.id_len != psid.id_len)
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return NULL;
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if (memcmp(prev_psid.id, psid.id, psid.id_len))
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return NULL;
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}
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prev_psid = psid;
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}
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return dev;
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}
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/**
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* netdev_switch_fib_ipv4_add - Add IPv4 route entry to switch
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*
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* @dst: route's IPv4 destination address
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* @dst_len: destination address length (prefix length)
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* @fi: route FIB info structure
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* @tos: route TOS
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* @type: route type
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* @nlflags: netlink flags passed in (NLM_F_*)
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* @tb_id: route table ID
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*
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* Add IPv4 route entry to switch device.
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*/
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int netdev_switch_fib_ipv4_add(u32 dst, int dst_len, struct fib_info *fi,
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u8 tos, u8 type, u32 nlflags, u32 tb_id)
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{
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struct net_device *dev;
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const struct net_device_ops *ops;
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int err = 0;
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/* Don't offload route if using custom ip rules or if
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* IPv4 FIB offloading has been disabled completely.
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*/
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#ifdef CONFIG_IP_MULTIPLE_TABLES
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if (fi->fib_net->ipv4.fib_has_custom_rules)
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return 0;
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#endif
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if (fi->fib_net->ipv4.fib_offload_disabled)
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return 0;
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dev = netdev_switch_get_dev_by_nhs(fi);
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if (!dev)
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return 0;
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ops = dev->netdev_ops;
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if (ops->ndo_switch_fib_ipv4_add) {
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err = ops->ndo_switch_fib_ipv4_add(dev, htonl(dst), dst_len,
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fi, tos, type, nlflags,
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tb_id);
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if (!err)
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fi->fib_flags |= RTNH_F_EXTERNAL;
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}
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return err;
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}
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EXPORT_SYMBOL_GPL(netdev_switch_fib_ipv4_add);
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/**
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* netdev_switch_fib_ipv4_del - Delete IPv4 route entry from switch
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*
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* @dst: route's IPv4 destination address
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* @dst_len: destination address length (prefix length)
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* @fi: route FIB info structure
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* @tos: route TOS
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* @type: route type
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* @tb_id: route table ID
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*
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* Delete IPv4 route entry from switch device.
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*/
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int netdev_switch_fib_ipv4_del(u32 dst, int dst_len, struct fib_info *fi,
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u8 tos, u8 type, u32 tb_id)
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{
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struct net_device *dev;
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const struct net_device_ops *ops;
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int err = 0;
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if (!(fi->fib_flags & RTNH_F_EXTERNAL))
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return 0;
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dev = netdev_switch_get_dev_by_nhs(fi);
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if (!dev)
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return 0;
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ops = dev->netdev_ops;
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if (ops->ndo_switch_fib_ipv4_del) {
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err = ops->ndo_switch_fib_ipv4_del(dev, htonl(dst), dst_len,
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fi, tos, type, tb_id);
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if (!err)
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fi->fib_flags &= ~RTNH_F_EXTERNAL;
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}
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return err;
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}
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EXPORT_SYMBOL_GPL(netdev_switch_fib_ipv4_del);
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/**
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* netdev_switch_fib_ipv4_abort - Abort an IPv4 FIB operation
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*
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* @fi: route FIB info structure
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*/
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void netdev_switch_fib_ipv4_abort(struct fib_info *fi)
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{
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/* There was a problem installing this route to the offload
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* device. For now, until we come up with more refined
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* policy handling, abruptly end IPv4 fib offloading for
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* for entire net by flushing offload device(s) of all
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* IPv4 routes, and mark IPv4 fib offloading broken from
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* this point forward.
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*/
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fib_flush_external(fi->fib_net);
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fi->fib_net->ipv4.fib_offload_disabled = true;
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}
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EXPORT_SYMBOL_GPL(netdev_switch_fib_ipv4_abort);
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