- 根目录:
- net
- switchdev
- switchdev.c
/*
* net/switchdev/switchdev.c - Switch device API
* Copyright (c) 2014 Jiri Pirko <jiri@resnulli.us>
* Copyright (c) 2014-2015 Scott Feldman <sfeldma@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/mutex.h>
#include <linux/notifier.h>
#include <linux/netdevice.h>
#include <net/ip_fib.h>
#include <net/switchdev.h>
/**
* netdev_switch_parent_id_get - Get ID of a switch
* @dev: port device
* @psid: switch ID
*
* Get ID of a switch this port is part of.
*/
int netdev_switch_parent_id_get(struct net_device *dev,
struct netdev_phys_item_id *psid)
{
const struct swdev_ops *ops = dev->swdev_ops;
if (!ops || !ops->swdev_parent_id_get)
return -EOPNOTSUPP;
return ops->swdev_parent_id_get(dev, psid);
}
EXPORT_SYMBOL_GPL(netdev_switch_parent_id_get);
/**
* netdev_switch_port_stp_update - Notify switch device port of STP
* state change
* @dev: port device
* @state: port STP state
*
* Notify switch device port of bridge port STP state change.
*/
int netdev_switch_port_stp_update(struct net_device *dev, u8 state)
{
const struct swdev_ops *ops = dev->swdev_ops;
struct net_device *lower_dev;
struct list_head *iter;
int err = -EOPNOTSUPP;
if (ops && ops->swdev_port_stp_update)
return ops->swdev_port_stp_update(dev, state);
netdev_for_each_lower_dev(dev, lower_dev, iter) {
err = netdev_switch_port_stp_update(lower_dev, state);
if (err && err != -EOPNOTSUPP)
return err;
}
return err;
}
EXPORT_SYMBOL_GPL(netdev_switch_port_stp_update);
static DEFINE_MUTEX(netdev_switch_mutex);
static RAW_NOTIFIER_HEAD(netdev_switch_notif_chain);
/**
* register_netdev_switch_notifier - Register notifier
* @nb: notifier_block
*
* Register switch device notifier. This should be used by code
* which needs to monitor events happening in particular device.
* Return values are same as for atomic_notifier_chain_register().
*/
int register_netdev_switch_notifier(struct notifier_block *nb)
{
int err;
mutex_lock(&netdev_switch_mutex);
err = raw_notifier_chain_register(&netdev_switch_notif_chain, nb);
mutex_unlock(&netdev_switch_mutex);
return err;
}
EXPORT_SYMBOL_GPL(register_netdev_switch_notifier);
/**
* unregister_netdev_switch_notifier - Unregister notifier
* @nb: notifier_block
*
* Unregister switch device notifier.
* Return values are same as for atomic_notifier_chain_unregister().
*/
int unregister_netdev_switch_notifier(struct notifier_block *nb)
{
int err;
mutex_lock(&netdev_switch_mutex);
err = raw_notifier_chain_unregister(&netdev_switch_notif_chain, nb);
mutex_unlock(&netdev_switch_mutex);
return err;
}
EXPORT_SYMBOL_GPL(unregister_netdev_switch_notifier);
/**
* call_netdev_switch_notifiers - Call notifiers
* @val: value passed unmodified to notifier function
* @dev: port device
* @info: notifier information data
*
* Call all network notifier blocks. This should be called by driver
* when it needs to propagate hardware event.
* Return values are same as for atomic_notifier_call_chain().
*/
int call_netdev_switch_notifiers(unsigned long val, struct net_device *dev,
struct netdev_switch_notifier_info *info)
{
int err;
info->dev = dev;
mutex_lock(&netdev_switch_mutex);
err = raw_notifier_call_chain(&netdev_switch_notif_chain, val, info);
mutex_unlock(&netdev_switch_mutex);
return err;
}
EXPORT_SYMBOL_GPL(call_netdev_switch_notifiers);
/**
* netdev_switch_port_bridge_setlink - Notify switch device port of bridge
* port attributes
*
* @dev: port device
* @nlh: netlink msg with bridge port attributes
* @flags: bridge setlink flags
*
* Notify switch device port of bridge port attributes
*/
int netdev_switch_port_bridge_setlink(struct net_device *dev,
struct nlmsghdr *nlh, u16 flags)
{
const struct net_device_ops *ops = dev->netdev_ops;
if (!(dev->features & NETIF_F_HW_SWITCH_OFFLOAD))
return 0;
if (!ops->ndo_bridge_setlink)
return -EOPNOTSUPP;
return ops->ndo_bridge_setlink(dev, nlh, flags);
}
EXPORT_SYMBOL_GPL(netdev_switch_port_bridge_setlink);
/**
* netdev_switch_port_bridge_dellink - Notify switch device port of bridge
* port attribute delete
*
* @dev: port device
* @nlh: netlink msg with bridge port attributes
* @flags: bridge setlink flags
*
* Notify switch device port of bridge port attribute delete
*/
int netdev_switch_port_bridge_dellink(struct net_device *dev,
struct nlmsghdr *nlh, u16 flags)
{
const struct net_device_ops *ops = dev->netdev_ops;
if (!(dev->features & NETIF_F_HW_SWITCH_OFFLOAD))
return 0;
if (!ops->ndo_bridge_dellink)
return -EOPNOTSUPP;
return ops->ndo_bridge_dellink(dev, nlh, flags);
}
EXPORT_SYMBOL_GPL(netdev_switch_port_bridge_dellink);
/**
* ndo_dflt_netdev_switch_port_bridge_setlink - default ndo bridge setlink
* op for master devices
*
* @dev: port device
* @nlh: netlink msg with bridge port attributes
* @flags: bridge setlink flags
*
* Notify master device slaves of bridge port attributes
*/
int ndo_dflt_netdev_switch_port_bridge_setlink(struct net_device *dev,
struct nlmsghdr *nlh, u16 flags)
{
struct net_device *lower_dev;
struct list_head *iter;
int ret = 0, err = 0;
if (!(dev->features & NETIF_F_HW_SWITCH_OFFLOAD))
return ret;
netdev_for_each_lower_dev(dev, lower_dev, iter) {
err = netdev_switch_port_bridge_setlink(lower_dev, nlh, flags);
if (err && err != -EOPNOTSUPP)
ret = err;
}
return ret;
}
EXPORT_SYMBOL_GPL(ndo_dflt_netdev_switch_port_bridge_setlink);
/**
* ndo_dflt_netdev_switch_port_bridge_dellink - default ndo bridge dellink
* op for master devices
*
* @dev: port device
* @nlh: netlink msg with bridge port attributes
* @flags: bridge dellink flags
*
* Notify master device slaves of bridge port attribute deletes
*/
int ndo_dflt_netdev_switch_port_bridge_dellink(struct net_device *dev,
struct nlmsghdr *nlh, u16 flags)
{
struct net_device *lower_dev;
struct list_head *iter;
int ret = 0, err = 0;
if (!(dev->features & NETIF_F_HW_SWITCH_OFFLOAD))
return ret;
netdev_for_each_lower_dev(dev, lower_dev, iter) {
err = netdev_switch_port_bridge_dellink(lower_dev, nlh, flags);
if (err && err != -EOPNOTSUPP)
ret = err;
}
return ret;
}
EXPORT_SYMBOL_GPL(ndo_dflt_netdev_switch_port_bridge_dellink);
static struct net_device *netdev_switch_get_lowest_dev(struct net_device *dev)
{
const struct swdev_ops *ops = dev->swdev_ops;
struct net_device *lower_dev;
struct net_device *port_dev;
struct list_head *iter;
/* Recusively search down until we find a sw port dev.
* (A sw port dev supports swdev_parent_id_get).
*/
if (dev->features & NETIF_F_HW_SWITCH_OFFLOAD &&
ops && ops->swdev_parent_id_get)
return dev;
netdev_for_each_lower_dev(dev, lower_dev, iter) {
port_dev = netdev_switch_get_lowest_dev(lower_dev);
if (port_dev)
return port_dev;
}
return NULL;
}
static struct net_device *netdev_switch_get_dev_by_nhs(struct fib_info *fi)
{
struct netdev_phys_item_id psid;
struct netdev_phys_item_id prev_psid;
struct net_device *dev = NULL;
int nhsel;
/* For this route, all nexthop devs must be on the same switch. */
for (nhsel = 0; nhsel < fi->fib_nhs; nhsel++) {
const struct fib_nh *nh = &fi->fib_nh[nhsel];
if (!nh->nh_dev)
return NULL;
dev = netdev_switch_get_lowest_dev(nh->nh_dev);
if (!dev)
return NULL;
if (netdev_switch_parent_id_get(dev, &psid))
return NULL;
if (nhsel > 0) {
if (prev_psid.id_len != psid.id_len)
return NULL;
if (memcmp(prev_psid.id, psid.id, psid.id_len))
return NULL;
}
prev_psid = psid;
}
return dev;
}
/**
* netdev_switch_fib_ipv4_add - Add IPv4 route entry to switch
*
* @dst: route's IPv4 destination address
* @dst_len: destination address length (prefix length)
* @fi: route FIB info structure
* @tos: route TOS
* @type: route type
* @nlflags: netlink flags passed in (NLM_F_*)
* @tb_id: route table ID
*
* Add IPv4 route entry to switch device.
*/
int netdev_switch_fib_ipv4_add(u32 dst, int dst_len, struct fib_info *fi,
u8 tos, u8 type, u32 nlflags, u32 tb_id)
{
struct net_device *dev;
const struct swdev_ops *ops;
int err = 0;
/* Don't offload route if using custom ip rules or if
* IPv4 FIB offloading has been disabled completely.
*/
#ifdef CONFIG_IP_MULTIPLE_TABLES
if (fi->fib_net->ipv4.fib_has_custom_rules)
return 0;
#endif
if (fi->fib_net->ipv4.fib_offload_disabled)
return 0;
dev = netdev_switch_get_dev_by_nhs(fi);
if (!dev)
return 0;
ops = dev->swdev_ops;
if (ops->swdev_fib_ipv4_add) {
err = ops->swdev_fib_ipv4_add(dev, htonl(dst), dst_len,
fi, tos, type, nlflags,
tb_id);
if (!err)
fi->fib_flags |= RTNH_F_OFFLOAD;
}
return err;
}
EXPORT_SYMBOL_GPL(netdev_switch_fib_ipv4_add);
/**
* netdev_switch_fib_ipv4_del - Delete IPv4 route entry from switch
*
* @dst: route's IPv4 destination address
* @dst_len: destination address length (prefix length)
* @fi: route FIB info structure
* @tos: route TOS
* @type: route type
* @tb_id: route table ID
*
* Delete IPv4 route entry from switch device.
*/
int netdev_switch_fib_ipv4_del(u32 dst, int dst_len, struct fib_info *fi,
u8 tos, u8 type, u32 tb_id)
{
struct net_device *dev;
const struct swdev_ops *ops;
int err = 0;
if (!(fi->fib_flags & RTNH_F_OFFLOAD))
return 0;
dev = netdev_switch_get_dev_by_nhs(fi);
if (!dev)
return 0;
ops = dev->swdev_ops;
if (ops->swdev_fib_ipv4_del) {
err = ops->swdev_fib_ipv4_del(dev, htonl(dst), dst_len,
fi, tos, type, tb_id);
if (!err)
fi->fib_flags &= ~RTNH_F_OFFLOAD;
}
return err;
}
EXPORT_SYMBOL_GPL(netdev_switch_fib_ipv4_del);
/**
* netdev_switch_fib_ipv4_abort - Abort an IPv4 FIB operation
*
* @fi: route FIB info structure
*/
void netdev_switch_fib_ipv4_abort(struct fib_info *fi)
{
/* There was a problem installing this route to the offload
* device. For now, until we come up with more refined
* policy handling, abruptly end IPv4 fib offloading for
* for entire net by flushing offload device(s) of all
* IPv4 routes, and mark IPv4 fib offloading broken from
* this point forward.
*/
fib_flush_external(fi->fib_net);
fi->fib_net->ipv4.fib_offload_disabled = true;
}
EXPORT_SYMBOL_GPL(netdev_switch_fib_ipv4_abort);