net/switchdev/switchdev.c - kernel/msm-4.19 - Gitiles

 /*
  * 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);
	/*
	* 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);