[deliverable/linux.git] / net / openvswitch / vport.c

/*
 * Copyright (c) 2007-2012 Nicira, Inc.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA
 */

#include <linux/etherdevice.h>
#include <linux/if.h>
#include <linux/if_vlan.h>
#include <linux/jhash.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/percpu.h>
#include <linux/rcupdate.h>
#include <linux/rtnetlink.h>
#include <linux/compat.h>
#include <net/net_namespace.h>

#include "datapath.h"
#include "vport.h"
#include "vport-internal_dev.h"

static void ovs_vport_record_error(struct vport *,
				   enum vport_err_type err_type);

/* List of statically compiled vport implementations.  Don't forget to also
 * add yours to the list at the bottom of vport.h. */
static const struct vport_ops *vport_ops_list[] = {
	&ovs_netdev_vport_ops,
	&ovs_internal_vport_ops,

#ifdef CONFIG_OPENVSWITCH_GRE
	&ovs_gre_vport_ops,
#endif
#ifdef CONFIG_OPENVSWITCH_VXLAN
	&ovs_vxlan_vport_ops,
#endif
};

/* Protected by RCU read lock for reading, ovs_mutex for writing. */
static struct hlist_head *dev_table;
#define VPORT_HASH_BUCKETS 1024

/**
 *	ovs_vport_init - initialize vport subsystem
 *
 * Called at module load time to initialize the vport subsystem.
 */
int ovs_vport_init(void)
{
	dev_table = kzalloc(VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
			    GFP_KERNEL);
	if (!dev_table)
		return -ENOMEM;

	return 0;
}

/**
 *	ovs_vport_exit - shutdown vport subsystem
 *
 * Called at module exit time to shutdown the vport subsystem.
 */
void ovs_vport_exit(void)
{
	kfree(dev_table);
}

static struct hlist_head *hash_bucket(struct net *net, const char *name)
{
	unsigned int hash = jhash(name, strlen(name), (unsigned long) net);
	return &dev_table[hash & (VPORT_HASH_BUCKETS - 1)];
}

/**
 *	ovs_vport_locate - find a port that has already been created
 *
 * @name: name of port to find
 *
 * Must be called with ovs or RCU read lock.
 */
struct vport *ovs_vport_locate(struct net *net, const char *name)
{
	struct hlist_head *bucket = hash_bucket(net, name);
	struct vport *vport;

	hlist_for_each_entry_rcu(vport, bucket, hash_node)
		if (!strcmp(name, vport->ops->get_name(vport)) &&
		    net_eq(ovs_dp_get_net(vport->dp), net))
			return vport;

	return NULL;
}

/**
 *	ovs_vport_alloc - allocate and initialize new vport
 *
 * @priv_size: Size of private data area to allocate.
 * @ops: vport device ops
 *
 * Allocate and initialize a new vport defined by @ops.  The vport will contain
 * a private data area of size @priv_size that can be accessed using
 * vport_priv().  vports that are no longer needed should be released with
 * vport_free().
 */
struct vport *ovs_vport_alloc(int priv_size, const struct vport_ops *ops,
			  const struct vport_parms *parms)
{
	struct vport *vport;
	size_t alloc_size;

	alloc_size = sizeof(struct vport);
	if (priv_size) {
		alloc_size = ALIGN(alloc_size, VPORT_ALIGN);
		alloc_size += priv_size;
	}

	vport = kzalloc(alloc_size, GFP_KERNEL);
	if (!vport)
		return ERR_PTR(-ENOMEM);

	vport->dp = parms->dp;
	vport->port_no = parms->port_no;
	vport->upcall_portid = parms->upcall_portid;
	vport->ops = ops;
	INIT_HLIST_NODE(&vport->dp_hash_node);

	vport->percpu_stats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
	if (!vport->percpu_stats) {
		kfree(vport);
		return ERR_PTR(-ENOMEM);
	}

	spin_lock_init(&vport->stats_lock);

	return vport;
}

/**
 *	ovs_vport_free - uninitialize and free vport
 *
 * @vport: vport to free
 *
 * Frees a vport allocated with vport_alloc() when it is no longer needed.
 *
 * The caller must ensure that an RCU grace period has passed since the last
 * time @vport was in a datapath.
 */
void ovs_vport_free(struct vport *vport)
{
	free_percpu(vport->percpu_stats);
	kfree(vport);
}

/**
 *	ovs_vport_add - add vport device (for kernel callers)
 *
 * @parms: Information about new vport.
 *
 * Creates a new vport with the specified configuration (which is dependent on
 * device type).  ovs_mutex must be held.
 */
struct vport *ovs_vport_add(const struct vport_parms *parms)
{
	struct vport *vport;
	int err = 0;
	int i;

	for (i = 0; i < ARRAY_SIZE(vport_ops_list); i++) {
		if (vport_ops_list[i]->type == parms->type) {
			struct hlist_head *bucket;

			vport = vport_ops_list[i]->create(parms);
			if (IS_ERR(vport)) {
				err = PTR_ERR(vport);
				goto out;
			}

			bucket = hash_bucket(ovs_dp_get_net(vport->dp),
					     vport->ops->get_name(vport));
			hlist_add_head_rcu(&vport->hash_node, bucket);
			return vport;
		}
	}

	err = -EAFNOSUPPORT;

out:
	return ERR_PTR(err);
}

/**
 *	ovs_vport_set_options - modify existing vport device (for kernel callers)
 *
 * @vport: vport to modify.
 * @options: New configuration.
 *
 * Modifies an existing device with the specified configuration (which is
 * dependent on device type).  ovs_mutex must be held.
 */
int ovs_vport_set_options(struct vport *vport, struct nlattr *options)
{
	if (!vport->ops->set_options)
		return -EOPNOTSUPP;
	return vport->ops->set_options(vport, options);
}

/**
 *	ovs_vport_del - delete existing vport device
 *
 * @vport: vport to delete.
 *
 * Detaches @vport from its datapath and destroys it.  It is possible to fail
 * for reasons such as lack of memory.  ovs_mutex must be held.
 */
void ovs_vport_del(struct vport *vport)
{
	ASSERT_OVSL();

	hlist_del_rcu(&vport->hash_node);

	vport->ops->destroy(vport);
}

/**
 *	ovs_vport_get_stats - retrieve device stats
 *
 * @vport: vport from which to retrieve the stats
 * @stats: location to store stats
 *
 * Retrieves transmit, receive, and error stats for the given device.
 *
 * Must be called with ovs_mutex or rcu_read_lock.
 */
void ovs_vport_get_stats(struct vport *vport, struct ovs_vport_stats *stats)
{
	int i;

	memset(stats, 0, sizeof(*stats));

	/* We potentially have 2 sources of stats that need to be combined:
	 * those we have collected (split into err_stats and percpu_stats) from
	 * set_stats() and device error stats from netdev->get_stats() (for
	 * errors that happen  downstream and therefore aren't reported through
	 * our vport_record_error() function).
	 * Stats from first source are reported by ovs (OVS_VPORT_ATTR_STATS).
	 * netdev-stats can be directly read over netlink-ioctl.
	 */

	spin_lock_bh(&vport->stats_lock);

	stats->rx_errors	= vport->err_stats.rx_errors;
	stats->tx_errors	= vport->err_stats.tx_errors;
	stats->tx_dropped	= vport->err_stats.tx_dropped;
	stats->rx_dropped	= vport->err_stats.rx_dropped;

	spin_unlock_bh(&vport->stats_lock);

	for_each_possible_cpu(i) {
		const struct pcpu_sw_netstats *percpu_stats;
		struct pcpu_sw_netstats local_stats;
		unsigned int start;

		percpu_stats = per_cpu_ptr(vport->percpu_stats, i);

		do {
			start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
			local_stats = *percpu_stats;
		} while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));

		stats->rx_bytes		+= local_stats.rx_bytes;
		stats->rx_packets	+= local_stats.rx_packets;
		stats->tx_bytes		+= local_stats.tx_bytes;
		stats->tx_packets	+= local_stats.tx_packets;
	}
}

/**
 *	ovs_vport_get_options - retrieve device options
 *
 * @vport: vport from which to retrieve the options.
 * @skb: sk_buff where options should be appended.
 *
 * Retrieves the configuration of the given device, appending an
 * %OVS_VPORT_ATTR_OPTIONS attribute that in turn contains nested
 * vport-specific attributes to @skb.
 *
 * Returns 0 if successful, -EMSGSIZE if @skb has insufficient room, or another
 * negative error code if a real error occurred.  If an error occurs, @skb is
 * left unmodified.
 *
 * Must be called with ovs_mutex or rcu_read_lock.
 */
int ovs_vport_get_options(const struct vport *vport, struct sk_buff *skb)
{
	struct nlattr *nla;
	int err;

	if (!vport->ops->get_options)
		return 0;

	nla = nla_nest_start(skb, OVS_VPORT_ATTR_OPTIONS);
	if (!nla)
		return -EMSGSIZE;

	err = vport->ops->get_options(vport, skb);
	if (err) {
		nla_nest_cancel(skb, nla);
		return err;
	}

	nla_nest_end(skb, nla);
	return 0;
}

/**
 *	ovs_vport_receive - pass up received packet to the datapath for processing
 *
 * @vport: vport that received the packet
 * @skb: skb that was received
 * @tun_key: tunnel (if any) that carried packet
 *
 * Must be called with rcu_read_lock.  The packet cannot be shared and
 * skb->data should point to the Ethernet header.
 */
void ovs_vport_receive(struct vport *vport, struct sk_buff *skb,
		       struct ovs_key_ipv4_tunnel *tun_key)
{
	struct pcpu_sw_netstats *stats;

	stats = this_cpu_ptr(vport->percpu_stats);
	u64_stats_update_begin(&stats->syncp);
	stats->rx_packets++;
	stats->rx_bytes += skb->len;
	u64_stats_update_end(&stats->syncp);

	OVS_CB(skb)->tun_key = tun_key;
	ovs_dp_process_received_packet(vport, skb);
}

/**
 *	ovs_vport_send - send a packet on a device
 *
 * @vport: vport on which to send the packet
 * @skb: skb to send
 *
 * Sends the given packet and returns the length of data sent.  Either ovs
 * lock or rcu_read_lock must be held.
 */
int ovs_vport_send(struct vport *vport, struct sk_buff *skb)
{
	int sent = vport->ops->send(vport, skb);

	if (likely(sent > 0)) {
		struct pcpu_sw_netstats *stats;

		stats = this_cpu_ptr(vport->percpu_stats);

		u64_stats_update_begin(&stats->syncp);
		stats->tx_packets++;
		stats->tx_bytes += sent;
		u64_stats_update_end(&stats->syncp);
	} else if (sent < 0) {
		ovs_vport_record_error(vport, VPORT_E_TX_ERROR);
		kfree_skb(skb);
	} else
		ovs_vport_record_error(vport, VPORT_E_TX_DROPPED);

	return sent;
}

/**
 *	ovs_vport_record_error - indicate device error to generic stats layer
 *
 * @vport: vport that encountered the error
 * @err_type: one of enum vport_err_type types to indicate the error type
 *
 * If using the vport generic stats layer indicate that an error of the given
 * type has occurred.
 */
static void ovs_vport_record_error(struct vport *vport,
				   enum vport_err_type err_type)
{
	spin_lock(&vport->stats_lock);

	switch (err_type) {
	case VPORT_E_RX_DROPPED:
		vport->err_stats.rx_dropped++;
		break;

	case VPORT_E_RX_ERROR:
		vport->err_stats.rx_errors++;
		break;

	case VPORT_E_TX_DROPPED:
		vport->err_stats.tx_dropped++;
		break;

	case VPORT_E_TX_ERROR:
		vport->err_stats.tx_errors++;
		break;
	}

	spin_unlock(&vport->stats_lock);
}

static void free_vport_rcu(struct rcu_head *rcu)
{
	struct vport *vport = container_of(rcu, struct vport, rcu);

	ovs_vport_free(vport);
}

void ovs_vport_deferred_free(struct vport *vport)
{
	if (!vport)
		return;

	call_rcu(&vport->rcu, free_vport_rcu);
}
Commit	Line	Data
ccb1352e	1	/*
caf2ee14	2	* Copyright (c) 2007-2012 Nicira, Inc.
ccb1352e JG	3	*
	4	* This program is free software; you can redistribute it and/or
	5	* modify it under the terms of version 2 of the GNU General Public
	6	* License as published by the Free Software Foundation.
	7	*
	8	* This program is distributed in the hope that it will be useful, but
	9	* WITHOUT ANY WARRANTY; without even the implied warranty of
	10	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	11	* General Public License for more details.
	12	*
	13	* You should have received a copy of the GNU General Public License
	14	* along with this program; if not, write to the Free Software
	15	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
	16	* 02110-1301, USA
	17	*/
	18
ccb1352e JG	19	#include <linux/etherdevice.h>
	20	#include <linux/if.h>
	21	#include <linux/if_vlan.h>
46df7b81	22	#include <linux/jhash.h>
ccb1352e JG	23	#include <linux/kernel.h>
	24	#include <linux/list.h>
	25	#include <linux/mutex.h>
	26	#include <linux/percpu.h>
	27	#include <linux/rcupdate.h>
	28	#include <linux/rtnetlink.h>
	29	#include <linux/compat.h>
46df7b81	30	#include <net/net_namespace.h>
ccb1352e	31
46df7b81	32	#include "datapath.h"
ccb1352e JG	33	#include "vport.h"
	34	#include "vport-internal_dev.h"
	35
443cd88c SH	36	static void ovs_vport_record_error(struct vport *,
	37	enum vport_err_type err_type);
	38
ccb1352e JG	39	/* List of statically compiled vport implementations. Don't forget to also
	40	* add yours to the list at the bottom of vport.h. */
	41	static const struct vport_ops *vport_ops_list[] = {
	42	&ovs_netdev_vport_ops,
	43	&ovs_internal_vport_ops,
aa310701	44
fb825a55	45	#ifdef CONFIG_OPENVSWITCH_GRE
aa310701 PS	46	&ovs_gre_vport_ops,
aa310701 PS	47	#endif
58264848 PS	48	#ifdef CONFIG_OPENVSWITCH_VXLAN
	49	&ovs_vxlan_vport_ops,
	50	#endif
ccb1352e JG	51	};
ccb1352e JG	52
8e4e1713	53	/* Protected by RCU read lock for reading, ovs_mutex for writing. */
ccb1352e JG	54	static struct hlist_head *dev_table;
	55	#define VPORT_HASH_BUCKETS 1024
	56
	57	/**
	58	* ovs_vport_init - initialize vport subsystem
	59	*
	60	* Called at module load time to initialize the vport subsystem.
	61	*/
	62	int ovs_vport_init(void)
	63	{
	64	dev_table = kzalloc(VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
	65	GFP_KERNEL);
	66	if (!dev_table)
	67	return -ENOMEM;
	68
	69	return 0;
	70	}
	71
	72	/**
	73	* ovs_vport_exit - shutdown vport subsystem
	74	*
	75	* Called at module exit time to shutdown the vport subsystem.
	76	*/
	77	void ovs_vport_exit(void)
	78	{
	79	kfree(dev_table);
	80	}
	81
46df7b81	82	static struct hlist_head hash_bucket(struct net net, const char *name)
ccb1352e	83	{
46df7b81	84	unsigned int hash = jhash(name, strlen(name), (unsigned long) net);
ccb1352e JG	85	return &dev_table[hash & (VPORT_HASH_BUCKETS - 1)];
	86	}
	87
	88	/**
	89	* ovs_vport_locate - find a port that has already been created
	90	*
	91	* @name: name of port to find
	92	*
8e4e1713	93	* Must be called with ovs or RCU read lock.
ccb1352e	94	*/
46df7b81	95	struct vport ovs_vport_locate(struct net net, const char *name)
ccb1352e	96	{
46df7b81	97	struct hlist_head *bucket = hash_bucket(net, name);
ccb1352e	98	struct vport *vport;
ccb1352e	99
b67bfe0d	100	hlist_for_each_entry_rcu(vport, bucket, hash_node)
46df7b81 PS	101	if (!strcmp(name, vport->ops->get_name(vport)) &&
46df7b81 PS	102	net_eq(ovs_dp_get_net(vport->dp), net))
ccb1352e JG	103	return vport;
	104
	105	return NULL;
	106	}
	107
	108	/**
	109	* ovs_vport_alloc - allocate and initialize new vport
	110	*
	111	* @priv_size: Size of private data area to allocate.
	112	* @ops: vport device ops
	113	*
	114	* Allocate and initialize a new vport defined by @ops. The vport will contain
	115	* a private data area of size @priv_size that can be accessed using
	116	* vport_priv(). vports that are no longer needed should be released with
	117	* vport_free().
	118	*/
	119	struct vport ovs_vport_alloc(int priv_size, const struct vport_ops ops,
	120	const struct vport_parms *parms)
	121	{
	122	struct vport *vport;
	123	size_t alloc_size;
	124
	125	alloc_size = sizeof(struct vport);
	126	if (priv_size) {
	127	alloc_size = ALIGN(alloc_size, VPORT_ALIGN);
	128	alloc_size += priv_size;
	129	}
	130
	131	vport = kzalloc(alloc_size, GFP_KERNEL);
	132	if (!vport)
	133	return ERR_PTR(-ENOMEM);
	134
	135	vport->dp = parms->dp;
	136	vport->port_no = parms->port_no;
15e47304	137	vport->upcall_portid = parms->upcall_portid;
ccb1352e	138	vport->ops = ops;
15eac2a7	139	INIT_HLIST_NODE(&vport->dp_hash_node);
ccb1352e	140
1c213bd2	141	vport->percpu_stats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
f0a98ae8 DC	142	if (!vport->percpu_stats) {
f0a98ae8 DC	143	kfree(vport);
ccb1352e	144	return ERR_PTR(-ENOMEM);
f0a98ae8	145	}
ccb1352e JG	146
	147	spin_lock_init(&vport->stats_lock);
	148
	149	return vport;
	150	}
	151
	152	/**
	153	* ovs_vport_free - uninitialize and free vport
	154	*
	155	* @vport: vport to free
	156	*
	157	* Frees a vport allocated with vport_alloc() when it is no longer needed.
	158	*
	159	* The caller must ensure that an RCU grace period has passed since the last
	160	* time @vport was in a datapath.
	161	*/
	162	void ovs_vport_free(struct vport *vport)
	163	{
	164	free_percpu(vport->percpu_stats);
	165	kfree(vport);
	166	}
	167
	168	/**
	169	* ovs_vport_add - add vport device (for kernel callers)
	170	*
	171	* @parms: Information about new vport.
	172	*
	173	* Creates a new vport with the specified configuration (which is dependent on
8e4e1713	174	* device type). ovs_mutex must be held.
ccb1352e JG	175	*/
	176	struct vport ovs_vport_add(const struct vport_parms parms)
	177	{
	178	struct vport *vport;
	179	int err = 0;
	180	int i;
	181
ccb1352e JG	182	for (i = 0; i < ARRAY_SIZE(vport_ops_list); i++) {
ccb1352e JG	183	if (vport_ops_list[i]->type == parms->type) {
46df7b81 PS	184	struct hlist_head *bucket;
46df7b81 PS	185
ccb1352e JG	186	vport = vport_ops_list[i]->create(parms);
	187	if (IS_ERR(vport)) {
	188	err = PTR_ERR(vport);
	189	goto out;
	190	}
	191
46df7b81 PS	192	bucket = hash_bucket(ovs_dp_get_net(vport->dp),
	193	vport->ops->get_name(vport));
	194	hlist_add_head_rcu(&vport->hash_node, bucket);
ccb1352e JG	195	return vport;
	196	}
	197	}
	198
	199	err = -EAFNOSUPPORT;
	200
	201	out:
	202	return ERR_PTR(err);
	203	}
	204
	205	/**
	206	* ovs_vport_set_options - modify existing vport device (for kernel callers)
	207	*
	208	* @vport: vport to modify.
2694838d	209	* @options: New configuration.
ccb1352e JG	210	*
ccb1352e JG	211	* Modifies an existing device with the specified configuration (which is
8e4e1713	212	* dependent on device type). ovs_mutex must be held.
ccb1352e JG	213	*/
	214	int ovs_vport_set_options(struct vport vport, struct nlattr options)
	215	{
ccb1352e JG	216	if (!vport->ops->set_options)
	217	return -EOPNOTSUPP;
	218	return vport->ops->set_options(vport, options);
	219	}
	220
	221	/**
	222	* ovs_vport_del - delete existing vport device
	223	*
	224	* @vport: vport to delete.
	225	*
	226	* Detaches @vport from its datapath and destroys it. It is possible to fail
8e4e1713	227	* for reasons such as lack of memory. ovs_mutex must be held.
ccb1352e JG	228	*/
	229	void ovs_vport_del(struct vport *vport)
	230	{
8e4e1713	231	ASSERT_OVSL();
ccb1352e JG	232
	233	hlist_del_rcu(&vport->hash_node);
	234
	235	vport->ops->destroy(vport);
	236	}
	237
	238	/**
	239	* ovs_vport_get_stats - retrieve device stats
	240	*
	241	* @vport: vport from which to retrieve the stats
	242	* @stats: location to store stats
	243	*
	244	* Retrieves transmit, receive, and error stats for the given device.
	245	*
8e4e1713	246	* Must be called with ovs_mutex or rcu_read_lock.
ccb1352e JG	247	*/
	248	void ovs_vport_get_stats(struct vport vport, struct ovs_vport_stats stats)
	249	{
	250	int i;
	251
	252	memset(stats, 0, sizeof(*stats));
	253
	254	/* We potentially have 2 sources of stats that need to be combined:
	255	* those we have collected (split into err_stats and percpu_stats) from
	256	* set_stats() and device error stats from netdev->get_stats() (for
	257	* errors that happen downstream and therefore aren't reported through
	258	* our vport_record_error() function).
	259	* Stats from first source are reported by ovs (OVS_VPORT_ATTR_STATS).
	260	* netdev-stats can be directly read over netlink-ioctl.
	261	*/
	262
	263	spin_lock_bh(&vport->stats_lock);
	264
	265	stats->rx_errors = vport->err_stats.rx_errors;
	266	stats->tx_errors = vport->err_stats.tx_errors;
	267	stats->tx_dropped = vport->err_stats.tx_dropped;
	268	stats->rx_dropped = vport->err_stats.rx_dropped;
	269
	270	spin_unlock_bh(&vport->stats_lock);
	271
	272	for_each_possible_cpu(i) {
8f84985f LR	273	const struct pcpu_sw_netstats *percpu_stats;
8f84985f LR	274	struct pcpu_sw_netstats local_stats;
ccb1352e JG	275	unsigned int start;
	276
	277	percpu_stats = per_cpu_ptr(vport->percpu_stats, i);
	278
	279	do {
57a7744e	280	start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
ccb1352e	281	local_stats = *percpu_stats;
57a7744e	282	} while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
ccb1352e JG	283
	284	stats->rx_bytes += local_stats.rx_bytes;
	285	stats->rx_packets += local_stats.rx_packets;
	286	stats->tx_bytes += local_stats.tx_bytes;
	287	stats->tx_packets += local_stats.tx_packets;
	288	}
	289	}
	290
	291	/**
	292	* ovs_vport_get_options - retrieve device options
	293	*
	294	* @vport: vport from which to retrieve the options.
	295	* @skb: sk_buff where options should be appended.
	296	*
	297	* Retrieves the configuration of the given device, appending an
	298	* %OVS_VPORT_ATTR_OPTIONS attribute that in turn contains nested
	299	* vport-specific attributes to @skb.
	300	*
	301	* Returns 0 if successful, -EMSGSIZE if @skb has insufficient room, or another
	302	* negative error code if a real error occurred. If an error occurs, @skb is
	303	* left unmodified.
	304	*
8e4e1713	305	* Must be called with ovs_mutex or rcu_read_lock.
ccb1352e JG	306	*/
	307	int ovs_vport_get_options(const struct vport vport, struct sk_buff skb)
	308	{
	309	struct nlattr *nla;
5d963352 TG	310	int err;
	311
	312	if (!vport->ops->get_options)
	313	return 0;
ccb1352e JG	314
	315	nla = nla_nest_start(skb, OVS_VPORT_ATTR_OPTIONS);
	316	if (!nla)
	317	return -EMSGSIZE;
	318
5d963352 TG	319	err = vport->ops->get_options(vport, skb);
	320	if (err) {
	321	nla_nest_cancel(skb, nla);
	322	return err;
ccb1352e JG	323	}
	324
	325	nla_nest_end(skb, nla);
	326	return 0;
	327	}
	328
	329	/**
	330	* ovs_vport_receive - pass up received packet to the datapath for processing
	331	*
	332	* @vport: vport that received the packet
	333	* @skb: skb that was received
2694838d	334	* @tun_key: tunnel (if any) that carried packet
ccb1352e JG	335	*
ccb1352e JG	336	* Must be called with rcu_read_lock. The packet cannot be shared and
d176ca2a	337	* skb->data should point to the Ethernet header.
ccb1352e	338	*/
7d5437c7 PS	339	void ovs_vport_receive(struct vport vport, struct sk_buff skb,
7d5437c7 PS	340	struct ovs_key_ipv4_tunnel *tun_key)
ccb1352e	341	{
8f84985f	342	struct pcpu_sw_netstats *stats;
ccb1352e	343
404f2f10	344	stats = this_cpu_ptr(vport->percpu_stats);
e0f0ecf3	345	u64_stats_update_begin(&stats->syncp);
ccb1352e JG	346	stats->rx_packets++;
ccb1352e JG	347	stats->rx_bytes += skb->len;
e0f0ecf3	348	u64_stats_update_end(&stats->syncp);
ccb1352e	349
7d5437c7	350	OVS_CB(skb)->tun_key = tun_key;
ccb1352e JG	351	ovs_dp_process_received_packet(vport, skb);
	352	}
	353
	354	/**
	355	* ovs_vport_send - send a packet on a device
	356	*
	357	* @vport: vport on which to send the packet
	358	* @skb: skb to send
	359	*
8e4e1713	360	* Sends the given packet and returns the length of data sent. Either ovs
ccb1352e JG	361	* lock or rcu_read_lock must be held.
	362	*/
	363	int ovs_vport_send(struct vport vport, struct sk_buff skb)
	364	{
	365	int sent = vport->ops->send(vport, skb);
	366
91b7514c	367	if (likely(sent > 0)) {
8f84985f	368	struct pcpu_sw_netstats *stats;
ccb1352e	369
404f2f10	370	stats = this_cpu_ptr(vport->percpu_stats);
ccb1352e	371
e0f0ecf3	372	u64_stats_update_begin(&stats->syncp);
ccb1352e JG	373	stats->tx_packets++;
ccb1352e JG	374	stats->tx_bytes += sent;
e0f0ecf3	375	u64_stats_update_end(&stats->syncp);
91b7514c PS	376	} else if (sent < 0) {
	377	ovs_vport_record_error(vport, VPORT_E_TX_ERROR);
	378	kfree_skb(skb);
	379	} else
	380	ovs_vport_record_error(vport, VPORT_E_TX_DROPPED);
	381
ccb1352e JG	382	return sent;
	383	}
	384
	385	/**
	386	* ovs_vport_record_error - indicate device error to generic stats layer
	387	*
	388	* @vport: vport that encountered the error
	389	* @err_type: one of enum vport_err_type types to indicate the error type
	390	*
	391	* If using the vport generic stats layer indicate that an error of the given
af784163	392	* type has occurred.
ccb1352e	393	*/
443cd88c SH	394	static void ovs_vport_record_error(struct vport *vport,
443cd88c SH	395	enum vport_err_type err_type)
ccb1352e JG	396	{
	397	spin_lock(&vport->stats_lock);
	398
	399	switch (err_type) {
	400	case VPORT_E_RX_DROPPED:
	401	vport->err_stats.rx_dropped++;
	402	break;
	403
	404	case VPORT_E_RX_ERROR:
	405	vport->err_stats.rx_errors++;
	406	break;
	407
	408	case VPORT_E_TX_DROPPED:
	409	vport->err_stats.tx_dropped++;
	410	break;
	411
	412	case VPORT_E_TX_ERROR:
	413	vport->err_stats.tx_errors++;
	414	break;
a2bf91b5	415	}
ccb1352e JG	416
	417	spin_unlock(&vport->stats_lock);
	418	}
aa310701 PS	419
	420	static void free_vport_rcu(struct rcu_head *rcu)
	421	{
	422	struct vport *vport = container_of(rcu, struct vport, rcu);
	423
	424	ovs_vport_free(vport);
	425	}
	426
	427	void ovs_vport_deferred_free(struct vport *vport)
	428	{
	429	if (!vport)
	430	return;
	431
	432	call_rcu(&vport->rcu, free_vport_rcu);
	433	}