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/reciprocal_div.h>
27 #include <linux/skbuff.h>
28 #include <linux/spinlock.h>
29 #include <linux/u64_stats_sync.h>
34 /* The following definitions are for users of the vport subsytem: */
36 struct vport __rcu *gre_vport;
37 struct vport __rcu *gre64_vport;
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(const struct net *net, const char *name);
48 void ovs_vport_get_stats(struct vport *, struct ovs_vport_stats *);
50 int ovs_vport_set_options(struct vport *, struct nlattr *options);
51 int ovs_vport_get_options(const struct vport *, struct sk_buff *);
53 int ovs_vport_set_upcall_portids(struct vport *, const struct nlattr *pids);
54 int ovs_vport_get_upcall_portids(const struct vport *, struct sk_buff *);
55 u32 ovs_vport_find_upcall_portid(const struct vport *, struct sk_buff *);
57 int ovs_vport_send(struct vport *, struct sk_buff *);
59 int ovs_tunnel_get_egress_info(struct ovs_tunnel_info *egress_tun_info,
61 const struct ovs_tunnel_info *tun_info,
66 int ovs_vport_get_egress_tun_info(struct vport *vport, struct sk_buff *skb,
67 struct ovs_tunnel_info *info);
69 /* The following definitions are for implementers of vport devices: */
70 struct vport_err_stats {
71 atomic_long_t rx_dropped;
72 atomic_long_t rx_errors;
73 atomic_long_t tx_dropped;
74 atomic_long_t tx_errors;
78 * struct vport_portids - array of netlink portids of a vport.
79 * must be protected by rcu.
80 * @rn_ids: The reciprocal value of @n_ids.
81 * @rcu: RCU callback head for deferred destruction.
82 * @n_ids: Size of @ids array.
83 * @ids: Array storing the Netlink socket pids to be used for packets received
84 * on this port that miss the flow table.
86 struct vport_portids {
87 struct reciprocal_value rn_ids;
94 * struct vport - one port within a datapath
95 * @rcu: RCU callback head for deferred destruction.
96 * @dp: Datapath to which this port belongs.
97 * @upcall_portids: RCU protected 'struct vport_portids'.
98 * @port_no: Index into @dp's @ports array.
99 * @hash_node: Element in @dev_table hash table in vport.c.
100 * @dp_hash_node: Element in @datapath->ports hash table in datapath.c.
101 * @ops: Class structure.
102 * @percpu_stats: Points to per-CPU statistics used and maintained by vport
103 * @err_stats: Points to error statistics used and maintained by vport
108 struct vport_portids __rcu *upcall_portids;
111 struct hlist_node hash_node;
112 struct hlist_node dp_hash_node;
113 const struct vport_ops *ops;
115 struct pcpu_sw_netstats __percpu *percpu_stats;
117 struct vport_err_stats err_stats;
121 * struct vport_parms - parameters for creating a new vport
123 * @name: New vport's name.
124 * @type: New vport's type.
125 * @options: %OVS_VPORT_ATTR_OPTIONS attribute from Netlink message, %NULL if
127 * @dp: New vport's datapath.
128 * @port_no: New vport's port number.
132 enum ovs_vport_type type;
133 struct nlattr *options;
135 /* For ovs_vport_alloc(). */
138 struct nlattr *upcall_portids;
142 * struct vport_ops - definition of a type of virtual port
144 * @type: %OVS_VPORT_TYPE_* value for this type of virtual port.
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 * @send: Send a packet on the device. Returns the length of the packet sent,
156 * zero for dropped packets or negative for error.
157 * @get_egress_tun_info: Get the egress tunnel 5-tuple and other info for
161 enum ovs_vport_type type;
163 /* Called with ovs_mutex. */
164 struct vport *(*create)(const struct vport_parms *);
165 void (*destroy)(struct vport *);
167 int (*set_options)(struct vport *, struct nlattr *);
168 int (*get_options)(const struct vport *, struct sk_buff *);
170 /* Called with rcu_read_lock or ovs_mutex. */
171 const char *(*get_name)(const struct vport *);
173 int (*send)(struct vport *, struct sk_buff *);
174 int (*get_egress_tun_info)(struct vport *, struct sk_buff *,
175 struct ovs_tunnel_info *);
178 enum vport_err_type {
185 struct vport *ovs_vport_alloc(int priv_size, const struct vport_ops *,
186 const struct vport_parms *);
187 void ovs_vport_free(struct vport *);
188 void ovs_vport_deferred_free(struct vport *vport);
190 #define VPORT_ALIGN 8
193 * vport_priv - access private data area of vport
195 * @vport: vport to access
197 * If a nonzero size was passed in priv_size of vport_alloc() a private data
198 * area was allocated on creation. This allows that area to be accessed and
199 * used for any purpose needed by the vport implementer.
201 static inline void *vport_priv(const struct vport *vport)
203 return (u8 *)(uintptr_t)vport + ALIGN(sizeof(struct vport), VPORT_ALIGN);
207 * vport_from_priv - lookup vport from private data pointer
209 * @priv: Start of private data area.
211 * It is sometimes useful to translate from a pointer to the private data
212 * area to the vport, such as in the case where the private data pointer is
213 * the result of a hash table lookup. @priv must point to the start of the
216 static inline struct vport *vport_from_priv(void *priv)
218 return (struct vport *)((u8 *)priv - ALIGN(sizeof(struct vport), VPORT_ALIGN));
221 void ovs_vport_receive(struct vport *, struct sk_buff *,
222 const struct ovs_tunnel_info *);
224 /* List of statically compiled vport implementations. Don't forget to also
225 * add yours to the list at the top of vport.c.
227 extern const struct vport_ops ovs_netdev_vport_ops;
228 extern const struct vport_ops ovs_internal_vport_ops;
229 extern const struct vport_ops ovs_geneve_vport_ops;
230 extern const struct vport_ops ovs_gre_vport_ops;
231 extern const struct vport_ops ovs_gre64_vport_ops;
232 extern const struct vport_ops ovs_vxlan_vport_ops;
233 extern const struct vport_ops ovs_lisp_vport_ops;
235 static inline void ovs_skb_postpush_rcsum(struct sk_buff *skb,
236 const void *start, unsigned int len)
238 if (skb->ip_summed == CHECKSUM_COMPLETE)
239 skb->csum = csum_add(skb->csum, csum_partial(start, len, 0));