[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"

/* 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
};

/* 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 = alloc_percpu(struct pcpu_tstats);
	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.
 * @port: 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_tstats *percpu_stats;
		struct pcpu_tstats local_stats;
		unsigned int start;

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

		do {
			start = u64_stats_fetch_begin_bh(&percpu_stats->syncp);
			local_stats = *percpu_stats;
		} while (u64_stats_fetch_retry_bh(&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
 *
 * 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_tstats *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_tstats *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.
 */
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
	36	/* List of statically compiled vport implementations. Don't forget to also
	37	* add yours to the list at the bottom of vport.h. */
	38	static const struct vport_ops *vport_ops_list[] = {
	39	&ovs_netdev_vport_ops,
	40	&ovs_internal_vport_ops,
aa310701	41
fb825a55	42	#ifdef CONFIG_OPENVSWITCH_GRE
aa310701 PS	43	&ovs_gre_vport_ops,
aa310701 PS	44	#endif
ccb1352e JG	45	};
ccb1352e JG	46
8e4e1713	47	/* Protected by RCU read lock for reading, ovs_mutex for writing. */
ccb1352e JG	48	static struct hlist_head *dev_table;
	49	#define VPORT_HASH_BUCKETS 1024
	50
	51	/**
	52	* ovs_vport_init - initialize vport subsystem
	53	*
	54	* Called at module load time to initialize the vport subsystem.
	55	*/
	56	int ovs_vport_init(void)
	57	{
	58	dev_table = kzalloc(VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
	59	GFP_KERNEL);
	60	if (!dev_table)
	61	return -ENOMEM;
	62
	63	return 0;
	64	}
	65
	66	/**
	67	* ovs_vport_exit - shutdown vport subsystem
	68	*
	69	* Called at module exit time to shutdown the vport subsystem.
	70	*/
	71	void ovs_vport_exit(void)
	72	{
	73	kfree(dev_table);
	74	}
	75
46df7b81	76	static struct hlist_head hash_bucket(struct net net, const char *name)
ccb1352e	77	{
46df7b81	78	unsigned int hash = jhash(name, strlen(name), (unsigned long) net);
ccb1352e JG	79	return &dev_table[hash & (VPORT_HASH_BUCKETS - 1)];
	80	}
	81
	82	/**
	83	* ovs_vport_locate - find a port that has already been created
	84	*
	85	* @name: name of port to find
	86	*
8e4e1713	87	* Must be called with ovs or RCU read lock.
ccb1352e	88	*/
46df7b81	89	struct vport ovs_vport_locate(struct net net, const char *name)
ccb1352e	90	{
46df7b81	91	struct hlist_head *bucket = hash_bucket(net, name);
ccb1352e	92	struct vport *vport;
ccb1352e	93
b67bfe0d	94	hlist_for_each_entry_rcu(vport, bucket, hash_node)
46df7b81 PS	95	if (!strcmp(name, vport->ops->get_name(vport)) &&
46df7b81 PS	96	net_eq(ovs_dp_get_net(vport->dp), net))
ccb1352e JG	97	return vport;
	98
	99	return NULL;
	100	}
	101
	102	/**
	103	* ovs_vport_alloc - allocate and initialize new vport
	104	*
	105	* @priv_size: Size of private data area to allocate.
	106	* @ops: vport device ops
	107	*
	108	* Allocate and initialize a new vport defined by @ops. The vport will contain
	109	* a private data area of size @priv_size that can be accessed using
	110	* vport_priv(). vports that are no longer needed should be released with
	111	* vport_free().
	112	*/
	113	struct vport ovs_vport_alloc(int priv_size, const struct vport_ops ops,
	114	const struct vport_parms *parms)
	115	{
	116	struct vport *vport;
	117	size_t alloc_size;
	118
	119	alloc_size = sizeof(struct vport);
	120	if (priv_size) {
	121	alloc_size = ALIGN(alloc_size, VPORT_ALIGN);
	122	alloc_size += priv_size;
	123	}
	124
	125	vport = kzalloc(alloc_size, GFP_KERNEL);
	126	if (!vport)
	127	return ERR_PTR(-ENOMEM);
	128
	129	vport->dp = parms->dp;
	130	vport->port_no = parms->port_no;
15e47304	131	vport->upcall_portid = parms->upcall_portid;
ccb1352e	132	vport->ops = ops;
15eac2a7	133	INIT_HLIST_NODE(&vport->dp_hash_node);
ccb1352e	134
e0f0ecf3	135	vport->percpu_stats = alloc_percpu(struct pcpu_tstats);
f0a98ae8 DC	136	if (!vport->percpu_stats) {
f0a98ae8 DC	137	kfree(vport);
ccb1352e	138	return ERR_PTR(-ENOMEM);
f0a98ae8	139	}
ccb1352e JG	140
	141	spin_lock_init(&vport->stats_lock);
	142
	143	return vport;
	144	}
	145
	146	/**
	147	* ovs_vport_free - uninitialize and free vport
	148	*
	149	* @vport: vport to free
	150	*
	151	* Frees a vport allocated with vport_alloc() when it is no longer needed.
	152	*
	153	* The caller must ensure that an RCU grace period has passed since the last
	154	* time @vport was in a datapath.
	155	*/
	156	void ovs_vport_free(struct vport *vport)
	157	{
	158	free_percpu(vport->percpu_stats);
	159	kfree(vport);
	160	}
	161
	162	/**
	163	* ovs_vport_add - add vport device (for kernel callers)
	164	*
	165	* @parms: Information about new vport.
	166	*
	167	* Creates a new vport with the specified configuration (which is dependent on
8e4e1713	168	* device type). ovs_mutex must be held.
ccb1352e JG	169	*/
	170	struct vport ovs_vport_add(const struct vport_parms parms)
	171	{
	172	struct vport *vport;
	173	int err = 0;
	174	int i;
	175
ccb1352e JG	176	for (i = 0; i < ARRAY_SIZE(vport_ops_list); i++) {
ccb1352e JG	177	if (vport_ops_list[i]->type == parms->type) {
46df7b81 PS	178	struct hlist_head *bucket;
46df7b81 PS	179
ccb1352e JG	180	vport = vport_ops_list[i]->create(parms);
	181	if (IS_ERR(vport)) {
	182	err = PTR_ERR(vport);
	183	goto out;
	184	}
	185
46df7b81 PS	186	bucket = hash_bucket(ovs_dp_get_net(vport->dp),
	187	vport->ops->get_name(vport));
	188	hlist_add_head_rcu(&vport->hash_node, bucket);
ccb1352e JG	189	return vport;
	190	}
	191	}
	192
	193	err = -EAFNOSUPPORT;
	194
	195	out:
	196	return ERR_PTR(err);
	197	}
	198
	199	/**
	200	* ovs_vport_set_options - modify existing vport device (for kernel callers)
	201	*
	202	* @vport: vport to modify.
	203	* @port: New configuration.
	204	*
	205	* Modifies an existing device with the specified configuration (which is
8e4e1713	206	* dependent on device type). ovs_mutex must be held.
ccb1352e JG	207	*/
	208	int ovs_vport_set_options(struct vport vport, struct nlattr options)
	209	{
ccb1352e JG	210	if (!vport->ops->set_options)
	211	return -EOPNOTSUPP;
	212	return vport->ops->set_options(vport, options);
	213	}
	214
	215	/**
	216	* ovs_vport_del - delete existing vport device
	217	*
	218	* @vport: vport to delete.
	219	*
	220	* Detaches @vport from its datapath and destroys it. It is possible to fail
8e4e1713	221	* for reasons such as lack of memory. ovs_mutex must be held.
ccb1352e JG	222	*/
	223	void ovs_vport_del(struct vport *vport)
	224	{
8e4e1713	225	ASSERT_OVSL();
ccb1352e JG	226
	227	hlist_del_rcu(&vport->hash_node);
	228
	229	vport->ops->destroy(vport);
	230	}
	231
	232	/**
	233	* ovs_vport_get_stats - retrieve device stats
	234	*
	235	* @vport: vport from which to retrieve the stats
	236	* @stats: location to store stats
	237	*
	238	* Retrieves transmit, receive, and error stats for the given device.
	239	*
8e4e1713	240	* Must be called with ovs_mutex or rcu_read_lock.
ccb1352e JG	241	*/
	242	void ovs_vport_get_stats(struct vport vport, struct ovs_vport_stats stats)
	243	{
	244	int i;
	245
	246	memset(stats, 0, sizeof(*stats));
	247
	248	/* We potentially have 2 sources of stats that need to be combined:
	249	* those we have collected (split into err_stats and percpu_stats) from
	250	* set_stats() and device error stats from netdev->get_stats() (for
	251	* errors that happen downstream and therefore aren't reported through
	252	* our vport_record_error() function).
	253	* Stats from first source are reported by ovs (OVS_VPORT_ATTR_STATS).
	254	* netdev-stats can be directly read over netlink-ioctl.
	255	*/
	256
	257	spin_lock_bh(&vport->stats_lock);
	258
	259	stats->rx_errors = vport->err_stats.rx_errors;
	260	stats->tx_errors = vport->err_stats.tx_errors;
	261	stats->tx_dropped = vport->err_stats.tx_dropped;
	262	stats->rx_dropped = vport->err_stats.rx_dropped;
	263
	264	spin_unlock_bh(&vport->stats_lock);
	265
	266	for_each_possible_cpu(i) {
e0f0ecf3 PS	267	const struct pcpu_tstats *percpu_stats;
e0f0ecf3 PS	268	struct pcpu_tstats local_stats;
ccb1352e JG	269	unsigned int start;
	270
	271	percpu_stats = per_cpu_ptr(vport->percpu_stats, i);
	272
	273	do {
e0f0ecf3	274	start = u64_stats_fetch_begin_bh(&percpu_stats->syncp);
ccb1352e	275	local_stats = *percpu_stats;
e0f0ecf3	276	} while (u64_stats_fetch_retry_bh(&percpu_stats->syncp, start));
ccb1352e JG	277
	278	stats->rx_bytes += local_stats.rx_bytes;
	279	stats->rx_packets += local_stats.rx_packets;
	280	stats->tx_bytes += local_stats.tx_bytes;
	281	stats->tx_packets += local_stats.tx_packets;
	282	}
	283	}
	284
	285	/**
	286	* ovs_vport_get_options - retrieve device options
	287	*
	288	* @vport: vport from which to retrieve the options.
	289	* @skb: sk_buff where options should be appended.
	290	*
	291	* Retrieves the configuration of the given device, appending an
	292	* %OVS_VPORT_ATTR_OPTIONS attribute that in turn contains nested
	293	* vport-specific attributes to @skb.
	294	*
	295	* Returns 0 if successful, -EMSGSIZE if @skb has insufficient room, or another
	296	* negative error code if a real error occurred. If an error occurs, @skb is
	297	* left unmodified.
	298	*
8e4e1713	299	* Must be called with ovs_mutex or rcu_read_lock.
ccb1352e JG	300	*/
	301	int ovs_vport_get_options(const struct vport vport, struct sk_buff skb)
	302	{
	303	struct nlattr *nla;
5d963352 TG	304	int err;
	305
	306	if (!vport->ops->get_options)
	307	return 0;
ccb1352e JG	308
	309	nla = nla_nest_start(skb, OVS_VPORT_ATTR_OPTIONS);
	310	if (!nla)
	311	return -EMSGSIZE;
	312
5d963352 TG	313	err = vport->ops->get_options(vport, skb);
	314	if (err) {
	315	nla_nest_cancel(skb, nla);
	316	return err;
ccb1352e JG	317	}
	318
	319	nla_nest_end(skb, nla);
	320	return 0;
	321	}
	322
	323	/**
	324	* ovs_vport_receive - pass up received packet to the datapath for processing
	325	*
	326	* @vport: vport that received the packet
	327	* @skb: skb that was received
	328	*
	329	* Must be called with rcu_read_lock. The packet cannot be shared and
d176ca2a	330	* skb->data should point to the Ethernet header.
ccb1352e	331	*/
7d5437c7 PS	332	void ovs_vport_receive(struct vport vport, struct sk_buff skb,
7d5437c7 PS	333	struct ovs_key_ipv4_tunnel *tun_key)
ccb1352e	334	{
e0f0ecf3	335	struct pcpu_tstats *stats;
ccb1352e	336
404f2f10	337	stats = this_cpu_ptr(vport->percpu_stats);
e0f0ecf3	338	u64_stats_update_begin(&stats->syncp);
ccb1352e JG	339	stats->rx_packets++;
ccb1352e JG	340	stats->rx_bytes += skb->len;
e0f0ecf3	341	u64_stats_update_end(&stats->syncp);
ccb1352e	342
7d5437c7	343	OVS_CB(skb)->tun_key = tun_key;
ccb1352e JG	344	ovs_dp_process_received_packet(vport, skb);
	345	}
	346
	347	/**
	348	* ovs_vport_send - send a packet on a device
	349	*
	350	* @vport: vport on which to send the packet
	351	* @skb: skb to send
	352	*
8e4e1713	353	* Sends the given packet and returns the length of data sent. Either ovs
ccb1352e JG	354	* lock or rcu_read_lock must be held.
	355	*/
	356	int ovs_vport_send(struct vport vport, struct sk_buff skb)
	357	{
	358	int sent = vport->ops->send(vport, skb);
	359
91b7514c	360	if (likely(sent > 0)) {
e0f0ecf3	361	struct pcpu_tstats *stats;
ccb1352e	362
404f2f10	363	stats = this_cpu_ptr(vport->percpu_stats);
ccb1352e	364
e0f0ecf3	365	u64_stats_update_begin(&stats->syncp);
ccb1352e JG	366	stats->tx_packets++;
ccb1352e JG	367	stats->tx_bytes += sent;
e0f0ecf3	368	u64_stats_update_end(&stats->syncp);
91b7514c PS	369	} else if (sent < 0) {
	370	ovs_vport_record_error(vport, VPORT_E_TX_ERROR);
	371	kfree_skb(skb);
	372	} else
	373	ovs_vport_record_error(vport, VPORT_E_TX_DROPPED);
	374
ccb1352e JG	375	return sent;
	376	}
	377
	378	/**
	379	* ovs_vport_record_error - indicate device error to generic stats layer
	380	*
	381	* @vport: vport that encountered the error
	382	* @err_type: one of enum vport_err_type types to indicate the error type
	383	*
	384	* If using the vport generic stats layer indicate that an error of the given
af784163	385	* type has occurred.
ccb1352e JG	386	*/
	387	void ovs_vport_record_error(struct vport *vport, enum vport_err_type err_type)
	388	{
	389	spin_lock(&vport->stats_lock);
	390
	391	switch (err_type) {
	392	case VPORT_E_RX_DROPPED:
	393	vport->err_stats.rx_dropped++;
	394	break;
	395
	396	case VPORT_E_RX_ERROR:
	397	vport->err_stats.rx_errors++;
	398	break;
	399
	400	case VPORT_E_TX_DROPPED:
	401	vport->err_stats.tx_dropped++;
	402	break;
	403
	404	case VPORT_E_TX_ERROR:
	405	vport->err_stats.tx_errors++;
	406	break;
a2bf91b5	407	}
ccb1352e JG	408
	409	spin_unlock(&vport->stats_lock);
	410	}
aa310701 PS	411
	412	static void free_vport_rcu(struct rcu_head *rcu)
	413	{
	414	struct vport *vport = container_of(rcu, struct vport, rcu);
	415
	416	ovs_vport_free(vport);
	417	}
	418
	419	void ovs_vport_deferred_free(struct vport *vport)
	420	{
	421	if (!vport)
	422	return;
	423
	424	call_rcu(&vport->rcu, free_vport_rcu);
	425	}