summaryrefslogtreecommitdiffstats
path: root/net/openvswitch/vport.h
blob: 8d721e62f388d9990b7850942196440550a2a6bb (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
/*
 * 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
 */

#ifndef VPORT_H
#define VPORT_H 1

#include <linux/if_tunnel.h>
#include <linux/list.h>
#include <linux/netlink.h>
#include <linux/openvswitch.h>
#include <linux/skbuff.h>
#include <linux/spinlock.h>
#include <linux/u64_stats_sync.h>

#include "datapath.h"

struct vport;
struct vport_parms;

/* The following definitions are for users of the vport subsytem: */

/* The following definitions are for users of the vport subsytem: */
struct vport_net {
	struct vport __rcu *gre_vport;
};

int ovs_vport_init(void);
void ovs_vport_exit(void);

struct vport *ovs_vport_add(const struct vport_parms *);
void ovs_vport_del(struct vport *);

struct vport *ovs_vport_locate(struct net *net, const char *name);

void ovs_vport_get_stats(struct vport *, struct ovs_vport_stats *);

int ovs_vport_set_options(struct vport *, struct nlattr *options);
int ovs_vport_get_options(const struct vport *, struct sk_buff *);

int ovs_vport_send(struct vport *, struct sk_buff *);

/* The following definitions are for implementers of vport devices: */

struct vport_err_stats {
	u64 rx_dropped;
	u64 rx_errors;
	u64 tx_dropped;
	u64 tx_errors;
};

/**
 * struct vport - one port within a datapath
 * @rcu: RCU callback head for deferred destruction.
 * @dp: Datapath to which this port belongs.
 * @upcall_portid: The Netlink port to use for packets received on this port that
 * miss the flow table.
 * @port_no: Index into @dp's @ports array.
 * @hash_node: Element in @dev_table hash table in vport.c.
 * @dp_hash_node: Element in @datapath->ports hash table in datapath.c.
 * @ops: Class structure.
 * @percpu_stats: Points to per-CPU statistics used and maintained by vport
 * @stats_lock: Protects @err_stats;
 * @err_stats: Points to error statistics used and maintained by vport
 */
struct vport {
	struct rcu_head rcu;
	struct datapath	*dp;
	u32 upcall_portid;
	u16 port_no;

	struct hlist_node hash_node;
	struct hlist_node dp_hash_node;
	const struct vport_ops *ops;

	struct pcpu_sw_netstats __percpu *percpu_stats;

	spinlock_t stats_lock;
	struct vport_err_stats err_stats;
};

/**
 * struct vport_parms - parameters for creating a new vport
 *
 * @name: New vport's name.
 * @type: New vport's type.
 * @options: %OVS_VPORT_ATTR_OPTIONS attribute from Netlink message, %NULL if
 * none was supplied.
 * @dp: New vport's datapath.
 * @port_no: New vport's port number.
 */
struct vport_parms {
	const char *name;
	enum ovs_vport_type type;
	struct nlattr *options;

	/* For ovs_vport_alloc(). */
	struct datapath *dp;
	u16 port_no;
	u32 upcall_portid;
};

/**
 * struct vport_ops - definition of a type of virtual port
 *
 * @type: %OVS_VPORT_TYPE_* value for this type of virtual port.
 * @create: Create a new vport configured as specified.  On success returns
 * a new vport allocated with ovs_vport_alloc(), otherwise an ERR_PTR() value.
 * @destroy: Destroys a vport.  Must call vport_free() on the vport but not
 * before an RCU grace period has elapsed.
 * @set_options: Modify the configuration of an existing vport.  May be %NULL
 * if modification is not supported.
 * @get_options: Appends vport-specific attributes for the configuration of an
 * existing vport to a &struct sk_buff.  May be %NULL for a vport that does not
 * have any configuration.
 * @get_name: Get the device's name.
 * @send: Send a packet on the device.  Returns the length of the packet sent,
 * zero for dropped packets or negative for error.
 */
struct vport_ops {
	enum ovs_vport_type type;

	/* Called with ovs_mutex. */
	struct vport *(*create)(const struct vport_parms *);
	void (*destroy)(struct vport *);

	int (*set_options)(struct vport *, struct nlattr *);
	int (*get_options)(const struct vport *, struct sk_buff *);

	/* Called with rcu_read_lock or ovs_mutex. */
	const char *(*get_name)(const struct vport *);

	int (*send)(struct vport *, struct sk_buff *);
};

enum vport_err_type {
	VPORT_E_RX_DROPPED,
	VPORT_E_RX_ERROR,
	VPORT_E_TX_DROPPED,
	VPORT_E_TX_ERROR,
};

struct vport *ovs_vport_alloc(int priv_size, const struct vport_ops *,
			      const struct vport_parms *);
void ovs_vport_free(struct vport *);
void ovs_vport_deferred_free(struct vport *vport);

#define VPORT_ALIGN 8

/**
 *	vport_priv - access private data area of vport
 *
 * @vport: vport to access
 *
 * If a nonzero size was passed in priv_size of vport_alloc() a private data
 * area was allocated on creation.  This allows that area to be accessed and
 * used for any purpose needed by the vport implementer.
 */
static inline void *vport_priv(const struct vport *vport)
{
	return (u8 *)(uintptr_t)vport + ALIGN(sizeof(struct vport), VPORT_ALIGN);
}

/**
 *	vport_from_priv - lookup vport from private data pointer
 *
 * @priv: Start of private data area.
 *
 * It is sometimes useful to translate from a pointer to the private data
 * area to the vport, such as in the case where the private data pointer is
 * the result of a hash table lookup.  @priv must point to the start of the
 * private data area.
 */
static inline struct vport *vport_from_priv(void *priv)
{
	return (struct vport *)((u8 *)priv - ALIGN(sizeof(struct vport), VPORT_ALIGN));
}

void ovs_vport_receive(struct vport *, struct sk_buff *,
		       struct ovs_key_ipv4_tunnel *);

/* List of statically compiled vport implementations.  Don't forget to also
 * add yours to the list at the top of vport.c. */
extern const struct vport_ops ovs_netdev_vport_ops;
extern const struct vport_ops ovs_internal_vport_ops;
extern const struct vport_ops ovs_gre_vport_ops;
extern const struct vport_ops ovs_vxlan_vport_ops;

static inline void ovs_skb_postpush_rcsum(struct sk_buff *skb,
				      const void *start, unsigned int len)
{
	if (skb->ip_summed == CHECKSUM_COMPLETE)
		skb->csum = csum_add(skb->csum, csum_partial(start, len, 0));
}

#endif /* vport.h */