2 * Copyright (c) 2007-2012 Nicira, Inc.
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.
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.
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
22 #include <linux/if_tunnel.h>
23 #include <linux/list.h>
24 #include <linux/netlink.h>
25 #include <linux/openvswitch.h>
26 #include <linux/skbuff.h>
27 #include <linux/spinlock.h>
28 #include <linux/u64_stats_sync.h>
35 /* The following definitions are for users of the vport subsytem: */
37 /* The following definitions are for users of the vport subsytem: */
39 struct vport __rcu
*gre_vport
;
42 int ovs_vport_init(void);
43 void ovs_vport_exit(void);
45 struct vport
*ovs_vport_add(const struct vport_parms
*);
46 void ovs_vport_del(struct vport
*);
48 struct vport
*ovs_vport_locate(struct net
*net
, const char *name
);
50 void ovs_vport_get_stats(struct vport
*, struct ovs_vport_stats
*);
52 int ovs_vport_set_options(struct vport
*, struct nlattr
*options
);
53 int ovs_vport_get_options(const struct vport
*, struct sk_buff
*);
55 int ovs_vport_send(struct vport
*, struct sk_buff
*);
57 /* The following definitions are for implementers of vport devices: */
59 struct vport_err_stats
{
67 * struct vport - one port within a datapath
68 * @rcu: RCU callback head for deferred destruction.
69 * @dp: Datapath to which this port belongs.
70 * @upcall_portid: The Netlink port to use for packets received on this port that
71 * miss the flow table.
72 * @port_no: Index into @dp's @ports array.
73 * @hash_node: Element in @dev_table hash table in vport.c.
74 * @dp_hash_node: Element in @datapath->ports hash table in datapath.c.
75 * @ops: Class structure.
76 * @percpu_stats: Points to per-CPU statistics used and maintained by vport
77 * @stats_lock: Protects @err_stats;
78 * @err_stats: Points to error statistics used and maintained by vport
86 struct hlist_node hash_node
;
87 struct hlist_node dp_hash_node
;
88 const struct vport_ops
*ops
;
90 struct pcpu_sw_netstats __percpu
*percpu_stats
;
92 spinlock_t stats_lock
;
93 struct vport_err_stats err_stats
;
97 * struct vport_parms - parameters for creating a new vport
99 * @name: New vport's name.
100 * @type: New vport's type.
101 * @options: %OVS_VPORT_ATTR_OPTIONS attribute from Netlink message, %NULL if
103 * @dp: New vport's datapath.
104 * @port_no: New vport's port number.
108 enum ovs_vport_type type
;
109 struct nlattr
*options
;
111 /* For ovs_vport_alloc(). */
118 * struct vport_ops - definition of a type of virtual port
120 * @type: %OVS_VPORT_TYPE_* value for this type of virtual port.
121 * @create: Create a new vport configured as specified. On success returns
122 * a new vport allocated with ovs_vport_alloc(), otherwise an ERR_PTR() value.
123 * @destroy: Destroys a vport. Must call vport_free() on the vport but not
124 * before an RCU grace period has elapsed.
125 * @set_options: Modify the configuration of an existing vport. May be %NULL
126 * if modification is not supported.
127 * @get_options: Appends vport-specific attributes for the configuration of an
128 * existing vport to a &struct sk_buff. May be %NULL for a vport that does not
129 * have any configuration.
130 * @get_name: Get the device's name.
131 * @send: Send a packet on the device. Returns the length of the packet sent,
132 * zero for dropped packets or negative for error.
135 enum ovs_vport_type type
;
137 /* Called with ovs_mutex. */
138 struct vport
*(*create
)(const struct vport_parms
*);
139 void (*destroy
)(struct vport
*);
141 int (*set_options
)(struct vport
*, struct nlattr
*);
142 int (*get_options
)(const struct vport
*, struct sk_buff
*);
144 /* Called with rcu_read_lock or ovs_mutex. */
145 const char *(*get_name
)(const struct vport
*);
147 int (*send
)(struct vport
*, struct sk_buff
*);
150 enum vport_err_type
{
157 struct vport
*ovs_vport_alloc(int priv_size
, const struct vport_ops
*,
158 const struct vport_parms
*);
159 void ovs_vport_free(struct vport
*);
160 void ovs_vport_deferred_free(struct vport
*vport
);
162 #define VPORT_ALIGN 8
165 * vport_priv - access private data area of vport
167 * @vport: vport to access
169 * If a nonzero size was passed in priv_size of vport_alloc() a private data
170 * area was allocated on creation. This allows that area to be accessed and
171 * used for any purpose needed by the vport implementer.
173 static inline void *vport_priv(const struct vport
*vport
)
175 return (u8
*)vport
+ ALIGN(sizeof(struct vport
), VPORT_ALIGN
);
179 * vport_from_priv - lookup vport from private data pointer
181 * @priv: Start of private data area.
183 * It is sometimes useful to translate from a pointer to the private data
184 * area to the vport, such as in the case where the private data pointer is
185 * the result of a hash table lookup. @priv must point to the start of the
188 static inline struct vport
*vport_from_priv(const void *priv
)
190 return (struct vport
*)(priv
- ALIGN(sizeof(struct vport
), VPORT_ALIGN
));
193 void ovs_vport_receive(struct vport
*, struct sk_buff
*,
194 struct ovs_key_ipv4_tunnel
*);
196 /* List of statically compiled vport implementations. Don't forget to also
197 * add yours to the list at the top of vport.c. */
198 extern const struct vport_ops ovs_netdev_vport_ops
;
199 extern const struct vport_ops ovs_internal_vport_ops
;
200 extern const struct vport_ops ovs_gre_vport_ops
;
201 extern const struct vport_ops ovs_vxlan_vport_ops
;
203 static inline void ovs_skb_postpush_rcsum(struct sk_buff
*skb
,
204 const void *start
, unsigned int len
)
206 if (skb
->ip_summed
== CHECKSUM_COMPLETE
)
207 skb
->csum
= csum_add(skb
->csum
, csum_partial(start
, len
, 0));