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/list.h>
23 #include <linux/netlink.h>
24 #include <linux/openvswitch.h>
25 #include <linux/skbuff.h>
26 #include <linux/spinlock.h>
27 #include <linux/u64_stats_sync.h>
29 #include "vport-capwap.h"
35 struct capwap_net capwap;
38 /* The following definitions are for users of the vport subsytem: */
40 int ovs_vport_init(void);
41 void ovs_vport_exit(void);
43 struct vport *ovs_vport_add(const struct vport_parms *);
44 void ovs_vport_del(struct vport *);
46 struct vport *ovs_vport_locate(struct net *net, const char *name);
48 void ovs_vport_set_stats(struct vport *, struct ovs_vport_stats *);
49 void ovs_vport_get_stats(struct vport *, struct ovs_vport_stats *);
51 int ovs_vport_set_options(struct vport *, struct nlattr *options);
52 int ovs_vport_get_options(const struct vport *, struct sk_buff *);
54 int ovs_vport_send(struct vport *, struct sk_buff *);
56 /* The following definitions are for implementers of vport devices: */
58 struct vport_percpu_stats {
63 struct u64_stats_sync sync;
66 struct vport_err_stats {
74 * struct vport - one port within a datapath
75 * @rcu: RCU callback head for deferred destruction.
76 * @dp: Datapath to which this port belongs.
77 * @linkname: The name of the link from /sys/class/net/<datapath>/brif to this
78 * &struct vport. (We keep this around so that we can delete it if the
79 * device gets renamed.) Set to the null string when no link exists.
80 * @upcall_portid: The Netlink port to use for packets received on this port that
81 * miss the flow table.
82 * @port_no: Index into @dp's @ports array.
83 * @hash_node: Element in @dev_table hash table in vport.c.
84 * @dp_hash_node: Element in @datapath->ports hash table in datapath.c.
85 * @ops: Class structure.
86 * @percpu_stats: Points to per-CPU statistics used and maintained by vport
87 * @stats_lock: Protects @err_stats and @offset_stats.
88 * @err_stats: Points to error statistics used and maintained by vport
89 * @offset_stats: Added to actual statistics as a sop to compatibility with
90 * XAPI for Citrix XenServer. Deprecated.
95 char linkname[IFNAMSIZ];
99 struct hlist_node hash_node;
100 struct hlist_node dp_hash_node;
101 const struct vport_ops *ops;
103 struct vport_percpu_stats __percpu *percpu_stats;
105 spinlock_t stats_lock;
106 struct vport_err_stats err_stats;
107 struct ovs_vport_stats offset_stats;
110 #define VPORT_F_REQUIRED (1 << 0) /* If init fails, module loading fails. */
111 #define VPORT_F_FLOW (1 << 1) /* Sets OVS_CB(skb)->flow. */
112 #define VPORT_F_TUN_ID (1 << 2) /* Sets OVS_CB(skb)->tun_id. */
115 * struct vport_parms - parameters for creating a new vport
117 * @name: New vport's name.
118 * @type: New vport's type.
119 * @options: %OVS_VPORT_ATTR_OPTIONS attribute from Netlink message, %NULL if
121 * @dp: New vport's datapath.
122 * @port_no: New vport's port number.
126 enum ovs_vport_type type;
127 struct nlattr *options;
129 /* For ovs_vport_alloc(). */
136 * struct vport_ops - definition of a type of virtual port
138 * @type: %OVS_VPORT_TYPE_* value for this type of virtual port.
139 * @flags: Flags of type VPORT_F_* that influence how the generic vport layer
140 * handles this vport.
141 * @init: Called at module initialization. If VPORT_F_REQUIRED is set then the
142 * failure of this function will cause the module to not load. If the flag is
143 * not set and initialzation fails then no vports of this type can be created.
144 * @exit: Called at module unload.
145 * @create: Create a new vport configured as specified. On success returns
146 * a new vport allocated with ovs_vport_alloc(), otherwise an ERR_PTR() value.
147 * @destroy: Destroys a vport. Must call vport_free() on the vport but not
148 * before an RCU grace period has elapsed.
149 * @set_options: Modify the configuration of an existing vport. May be %NULL
150 * if modification is not supported.
151 * @get_options: Appends vport-specific attributes for the configuration of an
152 * existing vport to a &struct sk_buff. May be %NULL for a vport that does not
153 * have any configuration.
154 * @get_name: Get the device's name.
155 * @get_config: Get the device's configuration.
156 * @get_ifindex: Get the system interface index associated with the device.
157 * May be null if the device does not have an ifindex.
158 * @send: Send a packet on the device. Returns the length of the packet sent.
161 enum ovs_vport_type type;
164 /* Called at module init and exit respectively. */
168 /* Called with RTNL lock. */
169 struct vport *(*create)(const struct vport_parms *);
170 void (*destroy)(struct vport *);
172 int (*set_options)(struct vport *, struct nlattr *);
173 int (*get_options)(const struct vport *, struct sk_buff *);
175 /* Called with rcu_read_lock or RTNL lock. */
176 const char *(*get_name)(const struct vport *);
177 void (*get_config)(const struct vport *, void *);
178 int (*get_ifindex)(const struct vport *);
179 int (*send)(struct vport *, struct sk_buff *);
182 enum vport_err_type {
189 struct vport *ovs_vport_alloc(int priv_size, const struct vport_ops *,
190 const struct vport_parms *);
191 void ovs_vport_free(struct vport *);
193 #define VPORT_ALIGN 8
196 * vport_priv - access private data area of vport
198 * @vport: vport to access
200 * If a nonzero size was passed in priv_size of vport_alloc() a private data
201 * area was allocated on creation. This allows that area to be accessed and
202 * used for any purpose needed by the vport implementer.
204 static inline void *vport_priv(const struct vport *vport)
206 return (u8 *)vport + ALIGN(sizeof(struct vport), VPORT_ALIGN);
210 * vport_from_priv - lookup vport from private data pointer
212 * @priv: Start of private data area.
214 * It is sometimes useful to translate from a pointer to the private data
215 * area to the vport, such as in the case where the private data pointer is
216 * the result of a hash table lookup. @priv must point to the start of the
219 static inline struct vport *vport_from_priv(const void *priv)
221 return (struct vport *)(priv - ALIGN(sizeof(struct vport), VPORT_ALIGN));
224 void ovs_vport_receive(struct vport *, struct sk_buff *);
225 void ovs_vport_record_error(struct vport *, enum vport_err_type err_type);
227 /* List of statically compiled vport implementations. Don't forget to also
228 * add yours to the list at the top of vport.c. */
229 extern const struct vport_ops ovs_netdev_vport_ops;
230 extern const struct vport_ops ovs_internal_vport_ops;
231 extern const struct vport_ops ovs_gre_vport_ops;
232 extern const struct vport_ops ovs_gre64_vport_ops;
233 extern const struct vport_ops ovs_capwap_vport_ops;
234 extern const struct vport_ops ovs_vxlan_vport_ops;