[deliverable/linux.git] / 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>

/**
 *	switchdev_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 switchdev_parent_id_get(struct net_device *dev,
			    struct netdev_phys_item_id *psid)
{
	const struct switchdev_ops *ops = dev->switchdev_ops;

	if (!ops || !ops->switchdev_parent_id_get)
		return -EOPNOTSUPP;
	return ops->switchdev_parent_id_get(dev, psid);
}
EXPORT_SYMBOL_GPL(switchdev_parent_id_get);

/**
 *	switchdev_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 switchdev_port_stp_update(struct net_device *dev, u8 state)
{
	const struct switchdev_ops *ops = dev->switchdev_ops;
	struct net_device *lower_dev;
	struct list_head *iter;
	int err = -EOPNOTSUPP;

	if (ops && ops->switchdev_port_stp_update)
		return ops->switchdev_port_stp_update(dev, state);

	netdev_for_each_lower_dev(dev, lower_dev, iter) {
		err = switchdev_port_stp_update(lower_dev, state);
		if (err && err != -EOPNOTSUPP)
			return err;
	}

	return err;
}
EXPORT_SYMBOL_GPL(switchdev_port_stp_update);

static DEFINE_MUTEX(switchdev_mutex);
static RAW_NOTIFIER_HEAD(switchdev_notif_chain);

/**
 *	register_switchdev_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_switchdev_notifier(struct notifier_block *nb)
{
	int err;

	mutex_lock(&switchdev_mutex);
	err = raw_notifier_chain_register(&switchdev_notif_chain, nb);
	mutex_unlock(&switchdev_mutex);
	return err;
}
EXPORT_SYMBOL_GPL(register_switchdev_notifier);

/**
 *	unregister_switchdev_notifier - Unregister notifier
 *	@nb: notifier_block
 *
 *	Unregister switch device notifier.
 *	Return values are same as for atomic_notifier_chain_unregister().
 */
int unregister_switchdev_notifier(struct notifier_block *nb)
{
	int err;

	mutex_lock(&switchdev_mutex);
	err = raw_notifier_chain_unregister(&switchdev_notif_chain, nb);
	mutex_unlock(&switchdev_mutex);
	return err;
}
EXPORT_SYMBOL_GPL(unregister_switchdev_notifier);

/**
 *	call_switchdev_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_switchdev_notifiers(unsigned long val, struct net_device *dev,
			     struct switchdev_notifier_info *info)
{
	int err;

	info->dev = dev;
	mutex_lock(&switchdev_mutex);
	err = raw_notifier_call_chain(&switchdev_notif_chain, val, info);
	mutex_unlock(&switchdev_mutex);
	return err;
}
EXPORT_SYMBOL_GPL(call_switchdev_notifiers);

/**
 *	switchdev_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 switchdev_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(switchdev_port_bridge_setlink);

/**
 *	switchdev_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 switchdev_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(switchdev_port_bridge_dellink);

/**
 *	ndo_dflt_switchdev_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_switchdev_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 = switchdev_port_bridge_setlink(lower_dev, nlh, flags);
		if (err && err != -EOPNOTSUPP)
			ret = err;
	}

	return ret;
}
EXPORT_SYMBOL_GPL(ndo_dflt_switchdev_port_bridge_setlink);

/**
 *	ndo_dflt_switchdev_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_switchdev_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 = switchdev_port_bridge_dellink(lower_dev, nlh, flags);
		if (err && err != -EOPNOTSUPP)
			ret = err;
	}

	return ret;
}
EXPORT_SYMBOL_GPL(ndo_dflt_switchdev_port_bridge_dellink);

static struct net_device *switchdev_get_lowest_dev(struct net_device *dev)
{
	const struct switchdev_ops *ops = dev->switchdev_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 switchdev_parent_id_get).
	 */

	if (dev->features & NETIF_F_HW_SWITCH_OFFLOAD &&
	    ops && ops->switchdev_parent_id_get)
		return dev;

	netdev_for_each_lower_dev(dev, lower_dev, iter) {
		port_dev = switchdev_get_lowest_dev(lower_dev);
		if (port_dev)
			return port_dev;
	}

	return NULL;
}

static struct net_device *switchdev_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 = switchdev_get_lowest_dev(nh->nh_dev);
		if (!dev)
			return NULL;

		if (switchdev_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;
}

/**
 *	switchdev_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 switchdev_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 switchdev_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 = switchdev_get_dev_by_nhs(fi);
	if (!dev)
		return 0;
	ops = dev->switchdev_ops;

	if (ops->switchdev_fib_ipv4_add) {
		err = ops->switchdev_fib_ipv4_add(dev, htonl(dst), dst_len,
						  fi, tos, type, nlflags,
						  tb_id);
		if (!err)
			fi->fib_flags |= RTNH_F_EXTERNAL;
	}

	return err;
}
EXPORT_SYMBOL_GPL(switchdev_fib_ipv4_add);

/**
 *	switchdev_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 switchdev_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 switchdev_ops *ops;
	int err = 0;

	if (!(fi->fib_flags & RTNH_F_EXTERNAL))
		return 0;

	dev = switchdev_get_dev_by_nhs(fi);
	if (!dev)
		return 0;
	ops = dev->switchdev_ops;

	if (ops->switchdev_fib_ipv4_del) {
		err = ops->switchdev_fib_ipv4_del(dev, htonl(dst), dst_len,
						  fi, tos, type, tb_id);
		if (!err)
			fi->fib_flags &= ~RTNH_F_EXTERNAL;
	}

	return err;
}
EXPORT_SYMBOL_GPL(switchdev_fib_ipv4_del);

/**
 *	switchdev_fib_ipv4_abort - Abort an IPv4 FIB operation
 *
 *	@fi: route FIB info structure
 */
void switchdev_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(switchdev_fib_ipv4_abort);
Commit	Line	Data
	1	/*
	2	* net/switchdev/switchdev.c - Switch device API
	3	* Copyright (c) 2014 Jiri Pirko <jiri@resnulli.us>
	4	* Copyright (c) 2014-2015 Scott Feldman <sfeldma@gmail.com>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*/
	11
	12	#include <linux/kernel.h>
	13	#include <linux/types.h>
	14	#include <linux/init.h>
	15	#include <linux/mutex.h>
	16	#include <linux/notifier.h>
	17	#include <linux/netdevice.h>
	18	#include <net/ip_fib.h>
	19	#include <net/switchdev.h>
	20
	21	/**
	22	* switchdev_parent_id_get - Get ID of a switch
	23	* @dev: port device
	24	* @psid: switch ID
	25	*
	26	* Get ID of a switch this port is part of.
	27	*/
	28	int switchdev_parent_id_get(struct net_device *dev,
	29	struct netdev_phys_item_id *psid)
	30	{
	31	const struct switchdev_ops *ops = dev->switchdev_ops;
	32
	33	if (!ops \|\| !ops->switchdev_parent_id_get)
	34	return -EOPNOTSUPP;
	35	return ops->switchdev_parent_id_get(dev, psid);
	36	}
	37	EXPORT_SYMBOL_GPL(switchdev_parent_id_get);
	38
	39	/**
	40	* switchdev_port_stp_update - Notify switch device port of STP
	41	* state change
	42	* @dev: port device
	43	* @state: port STP state
	44	*
	45	* Notify switch device port of bridge port STP state change.
	46	*/
	47	int switchdev_port_stp_update(struct net_device *dev, u8 state)
	48	{
	49	const struct switchdev_ops *ops = dev->switchdev_ops;
	50	struct net_device *lower_dev;
	51	struct list_head *iter;
	52	int err = -EOPNOTSUPP;
	53
	54	if (ops && ops->switchdev_port_stp_update)
	55	return ops->switchdev_port_stp_update(dev, state);
	56
	57	netdev_for_each_lower_dev(dev, lower_dev, iter) {
	58	err = switchdev_port_stp_update(lower_dev, state);
	59	if (err && err != -EOPNOTSUPP)
	60	return err;
	61	}
	62
	63	return err;
	64	}
	65	EXPORT_SYMBOL_GPL(switchdev_port_stp_update);
	66
	67	static DEFINE_MUTEX(switchdev_mutex);
	68	static RAW_NOTIFIER_HEAD(switchdev_notif_chain);
	69
	70	/**
	71	* register_switchdev_notifier - Register notifier
	72	* @nb: notifier_block
	73	*
	74	* Register switch device notifier. This should be used by code
	75	* which needs to monitor events happening in particular device.
	76	* Return values are same as for atomic_notifier_chain_register().
	77	*/
	78	int register_switchdev_notifier(struct notifier_block *nb)
	79	{
	80	int err;
	81
	82	mutex_lock(&switchdev_mutex);
	83	err = raw_notifier_chain_register(&switchdev_notif_chain, nb);
	84	mutex_unlock(&switchdev_mutex);
	85	return err;
	86	}
	87	EXPORT_SYMBOL_GPL(register_switchdev_notifier);
	88
	89	/**
	90	* unregister_switchdev_notifier - Unregister notifier
	91	* @nb: notifier_block
	92	*
	93	* Unregister switch device notifier.
	94	* Return values are same as for atomic_notifier_chain_unregister().
	95	*/
	96	int unregister_switchdev_notifier(struct notifier_block *nb)
	97	{
	98	int err;
	99
	100	mutex_lock(&switchdev_mutex);
	101	err = raw_notifier_chain_unregister(&switchdev_notif_chain, nb);
	102	mutex_unlock(&switchdev_mutex);
	103	return err;
	104	}
	105	EXPORT_SYMBOL_GPL(unregister_switchdev_notifier);
	106
	107	/**
	108	* call_switchdev_notifiers - Call notifiers
	109	* @val: value passed unmodified to notifier function
	110	* @dev: port device
	111	* @info: notifier information data
	112	*
	113	* Call all network notifier blocks. This should be called by driver
	114	* when it needs to propagate hardware event.
	115	* Return values are same as for atomic_notifier_call_chain().
	116	*/
	117	int call_switchdev_notifiers(unsigned long val, struct net_device *dev,
	118	struct switchdev_notifier_info *info)
	119	{
	120	int err;
	121
	122	info->dev = dev;
	123	mutex_lock(&switchdev_mutex);
	124	err = raw_notifier_call_chain(&switchdev_notif_chain, val, info);
	125	mutex_unlock(&switchdev_mutex);
	126	return err;
	127	}
	128	EXPORT_SYMBOL_GPL(call_switchdev_notifiers);
	129
	130	/**
	131	* switchdev_port_bridge_setlink - Notify switch device port of bridge
	132	* port attributes
	133	*
	134	* @dev: port device
	135	* @nlh: netlink msg with bridge port attributes
	136	* @flags: bridge setlink flags
	137	*
	138	* Notify switch device port of bridge port attributes
	139	*/
	140	int switchdev_port_bridge_setlink(struct net_device *dev,
	141	struct nlmsghdr *nlh, u16 flags)
	142	{
	143	const struct net_device_ops *ops = dev->netdev_ops;
	144
	145	if (!(dev->features & NETIF_F_HW_SWITCH_OFFLOAD))
	146	return 0;
	147
	148	if (!ops->ndo_bridge_setlink)
	149	return -EOPNOTSUPP;
	150
	151	return ops->ndo_bridge_setlink(dev, nlh, flags);
	152	}
	153	EXPORT_SYMBOL_GPL(switchdev_port_bridge_setlink);
	154
	155	/**
	156	* switchdev_port_bridge_dellink - Notify switch device port of bridge
	157	* port attribute delete
	158	*
	159	* @dev: port device
	160	* @nlh: netlink msg with bridge port attributes
	161	* @flags: bridge setlink flags
	162	*
	163	* Notify switch device port of bridge port attribute delete
	164	*/
	165	int switchdev_port_bridge_dellink(struct net_device *dev,
	166	struct nlmsghdr *nlh, u16 flags)
	167	{
	168	const struct net_device_ops *ops = dev->netdev_ops;
	169
	170	if (!(dev->features & NETIF_F_HW_SWITCH_OFFLOAD))
	171	return 0;
	172
	173	if (!ops->ndo_bridge_dellink)
	174	return -EOPNOTSUPP;
	175
	176	return ops->ndo_bridge_dellink(dev, nlh, flags);
	177	}
	178	EXPORT_SYMBOL_GPL(switchdev_port_bridge_dellink);
	179
	180	/**
	181	* ndo_dflt_switchdev_port_bridge_setlink - default ndo bridge setlink
	182	* op for master devices
	183	*
	184	* @dev: port device
	185	* @nlh: netlink msg with bridge port attributes
	186	* @flags: bridge setlink flags
	187	*
	188	* Notify master device slaves of bridge port attributes
	189	*/
	190	int ndo_dflt_switchdev_port_bridge_setlink(struct net_device *dev,
	191	struct nlmsghdr *nlh, u16 flags)
	192	{
	193	struct net_device *lower_dev;
	194	struct list_head *iter;
	195	int ret = 0, err = 0;
	196
	197	if (!(dev->features & NETIF_F_HW_SWITCH_OFFLOAD))
	198	return ret;
	199
	200	netdev_for_each_lower_dev(dev, lower_dev, iter) {
	201	err = switchdev_port_bridge_setlink(lower_dev, nlh, flags);
	202	if (err && err != -EOPNOTSUPP)
	203	ret = err;
	204	}
	205
	206	return ret;
	207	}
	208	EXPORT_SYMBOL_GPL(ndo_dflt_switchdev_port_bridge_setlink);
	209
	210	/**
	211	* ndo_dflt_switchdev_port_bridge_dellink - default ndo bridge dellink
	212	* op for master devices
	213	*
	214	* @dev: port device
	215	* @nlh: netlink msg with bridge port attributes
	216	* @flags: bridge dellink flags
	217	*
	218	* Notify master device slaves of bridge port attribute deletes
	219	*/
	220	int ndo_dflt_switchdev_port_bridge_dellink(struct net_device *dev,
	221	struct nlmsghdr *nlh, u16 flags)
	222	{
	223	struct net_device *lower_dev;
	224	struct list_head *iter;
	225	int ret = 0, err = 0;
	226
	227	if (!(dev->features & NETIF_F_HW_SWITCH_OFFLOAD))
	228	return ret;
	229
	230	netdev_for_each_lower_dev(dev, lower_dev, iter) {
	231	err = switchdev_port_bridge_dellink(lower_dev, nlh, flags);
	232	if (err && err != -EOPNOTSUPP)
	233	ret = err;
	234	}
	235
	236	return ret;
	237	}
	238	EXPORT_SYMBOL_GPL(ndo_dflt_switchdev_port_bridge_dellink);
	239
	240	static struct net_device switchdev_get_lowest_dev(struct net_device dev)
	241	{
	242	const struct switchdev_ops *ops = dev->switchdev_ops;
	243	struct net_device *lower_dev;
	244	struct net_device *port_dev;
	245	struct list_head *iter;
	246
	247	/* Recusively search down until we find a sw port dev.
	248	* (A sw port dev supports switchdev_parent_id_get).
	249	*/
	250
	251	if (dev->features & NETIF_F_HW_SWITCH_OFFLOAD &&
	252	ops && ops->switchdev_parent_id_get)
	253	return dev;
	254
	255	netdev_for_each_lower_dev(dev, lower_dev, iter) {
	256	port_dev = switchdev_get_lowest_dev(lower_dev);
	257	if (port_dev)
	258	return port_dev;
	259	}
	260
	261	return NULL;
	262	}
	263
	264	static struct net_device switchdev_get_dev_by_nhs(struct fib_info fi)
	265	{
	266	struct netdev_phys_item_id psid;
	267	struct netdev_phys_item_id prev_psid;
	268	struct net_device *dev = NULL;
	269	int nhsel;
	270
	271	/* For this route, all nexthop devs must be on the same switch. */
	272
	273	for (nhsel = 0; nhsel < fi->fib_nhs; nhsel++) {
	274	const struct fib_nh *nh = &fi->fib_nh[nhsel];
	275
	276	if (!nh->nh_dev)
	277	return NULL;
	278
	279	dev = switchdev_get_lowest_dev(nh->nh_dev);
	280	if (!dev)
	281	return NULL;
	282
	283	if (switchdev_parent_id_get(dev, &psid))
	284	return NULL;
	285
	286	if (nhsel > 0) {
	287	if (prev_psid.id_len != psid.id_len)
	288	return NULL;
	289	if (memcmp(prev_psid.id, psid.id, psid.id_len))
	290	return NULL;
	291	}
	292
	293	prev_psid = psid;
	294	}
	295
	296	return dev;
	297	}
	298
	299	/**
	300	* switchdev_fib_ipv4_add - Add IPv4 route entry to switch
	301	*
	302	* @dst: route's IPv4 destination address
	303	* @dst_len: destination address length (prefix length)
	304	* @fi: route FIB info structure
	305	* @tos: route TOS
	306	* @type: route type
	307	* @nlflags: netlink flags passed in (NLM_F_*)
	308	* @tb_id: route table ID
	309	*
	310	* Add IPv4 route entry to switch device.
	311	*/
	312	int switchdev_fib_ipv4_add(u32 dst, int dst_len, struct fib_info *fi,
	313	u8 tos, u8 type, u32 nlflags, u32 tb_id)
	314	{
	315	struct net_device *dev;
	316	const struct switchdev_ops *ops;
	317	int err = 0;
	318
	319	/* Don't offload route if using custom ip rules or if
	320	* IPv4 FIB offloading has been disabled completely.
	321	*/
	322
	323	#ifdef CONFIG_IP_MULTIPLE_TABLES
	324	if (fi->fib_net->ipv4.fib_has_custom_rules)
	325	return 0;
	326	#endif
	327
	328	if (fi->fib_net->ipv4.fib_offload_disabled)
	329	return 0;
	330
	331	dev = switchdev_get_dev_by_nhs(fi);
	332	if (!dev)
	333	return 0;
	334	ops = dev->switchdev_ops;
	335
	336	if (ops->switchdev_fib_ipv4_add) {
	337	err = ops->switchdev_fib_ipv4_add(dev, htonl(dst), dst_len,
	338	fi, tos, type, nlflags,
	339	tb_id);
	340	if (!err)
	341	fi->fib_flags \|= RTNH_F_EXTERNAL;
	342	}
	343
	344	return err;
	345	}
	346	EXPORT_SYMBOL_GPL(switchdev_fib_ipv4_add);
	347
	348	/**
	349	* switchdev_fib_ipv4_del - Delete IPv4 route entry from switch
	350	*
	351	* @dst: route's IPv4 destination address
	352	* @dst_len: destination address length (prefix length)
	353	* @fi: route FIB info structure
	354	* @tos: route TOS
	355	* @type: route type
	356	* @tb_id: route table ID
	357	*
	358	* Delete IPv4 route entry from switch device.
	359	*/
	360	int switchdev_fib_ipv4_del(u32 dst, int dst_len, struct fib_info *fi,
	361	u8 tos, u8 type, u32 tb_id)
	362	{
	363	struct net_device *dev;
	364	const struct switchdev_ops *ops;
	365	int err = 0;
	366
	367	if (!(fi->fib_flags & RTNH_F_EXTERNAL))
	368	return 0;
	369
	370	dev = switchdev_get_dev_by_nhs(fi);
	371	if (!dev)
	372	return 0;
	373	ops = dev->switchdev_ops;
	374
	375	if (ops->switchdev_fib_ipv4_del) {
	376	err = ops->switchdev_fib_ipv4_del(dev, htonl(dst), dst_len,
	377	fi, tos, type, tb_id);
	378	if (!err)
	379	fi->fib_flags &= ~RTNH_F_EXTERNAL;
	380	}
	381
	382	return err;
	383	}
	384	EXPORT_SYMBOL_GPL(switchdev_fib_ipv4_del);
	385
	386	/**
	387	* switchdev_fib_ipv4_abort - Abort an IPv4 FIB operation
	388	*
	389	* @fi: route FIB info structure
	390	*/
	391	void switchdev_fib_ipv4_abort(struct fib_info *fi)
	392	{
	393	/* There was a problem installing this route to the offload
	394	* device. For now, until we come up with more refined
	395	* policy handling, abruptly end IPv4 fib offloading for
	396	* for entire net by flushing offload device(s) of all
	397	* IPv4 routes, and mark IPv4 fib offloading broken from
	398	* this point forward.
	399	*/
	400
	401	fib_flush_external(fi->fib_net);
	402	fi->fib_net->ipv4.fib_offload_disabled = true;
	403	}
	404	EXPORT_SYMBOL_GPL(switchdev_fib_ipv4_abort);