net/openvswitch/vport.h

   1 /*
   2  * Copyright (c) 2007-2012 Nicira, Inc.
   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
  19 #ifndef VPORT_H
  20 #define VPORT_H 1
  21
  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>
  28
  29 #include "datapath.h"
  30
  31 struct vport;
  32 struct vport_parms;
  33
  34 /* The following definitions are for users of the vport subsytem: */
  35
  36 int ovs_vport_init(void);
  37 void ovs_vport_exit(void);
  38
  39 struct vport *ovs_vport_add(const struct vport_parms *);
  40 void ovs_vport_del(struct vport *);
  41
  42 struct vport *ovs_vport_locate(struct net *net, const char *name);
  43
  44 void ovs_vport_get_stats(struct vport *, struct ovs_vport_stats *);
  45
  46 int ovs_vport_set_options(struct vport *, struct nlattr *options);
  47 int ovs_vport_get_options(const struct vport *, struct sk_buff *);
  48
  49 int ovs_vport_send(struct vport *, struct sk_buff *);
  50
  51 /* The following definitions are for implementers of vport devices: */
  52
  53 struct vport_percpu_stats {
  54         u64 rx_bytes;
  55         u64 rx_packets;
  56         u64 tx_bytes;
  57         u64 tx_packets;
  58         struct u64_stats_sync sync;
  59 };
  60
  61 struct vport_err_stats {
  62         u64 rx_dropped;
  63         u64 rx_errors;
  64         u64 tx_dropped;
  65         u64 tx_errors;
  66 };
  67
  68 /**
  69  * struct vport - one port within a datapath
  70  * @rcu: RCU callback head for deferred destruction.
  71  * @port_no: Index into @dp's @ports array.
  72  * @dp: Datapath to which this port belongs.
  73  * @upcall_portid: The Netlink port to use for packets received on this port that
  74  * miss the flow table.
  75  * @hash_node: Element in @dev_table hash table in vport.c.
  76  * @dp_hash_node: Element in @datapath->ports hash table in datapath.c.
  77  * @ops: Class structure.
  78  * @percpu_stats: Points to per-CPU statistics used and maintained by vport
  79  * @stats_lock: Protects @err_stats;
  80  * @err_stats: Points to error statistics used and maintained by vport
  81  */
  82 struct vport {
  83         struct rcu_head rcu;
  84         u16 port_no;
  85         struct datapath *dp;
  86         u32 upcall_portid;
  87
  88         struct hlist_node hash_node;
  89         struct hlist_node dp_hash_node;
  90         const struct vport_ops *ops;
  91
  92         struct vport_percpu_stats __percpu *percpu_stats;
  93
  94         spinlock_t stats_lock;
  95         struct vport_err_stats err_stats;
  96 };
  97
  98 /**
  99  * struct vport_parms - parameters for creating a new vport
 100  *
 101  * @name: New vport's name.
 102  * @type: New vport's type.
 103  * @options: %OVS_VPORT_ATTR_OPTIONS attribute from Netlink message, %NULL if
 104  * none was supplied.
 105  * @dp: New vport's datapath.
 106  * @port_no: New vport's port number.
 107  */
 108 struct vport_parms {
 109         const char *name;
 110         enum ovs_vport_type type;
 111         struct nlattr *options;
 112
 113         /* For ovs_vport_alloc(). */
 114         struct datapath *dp;
 115         u16 port_no;
 116         u32 upcall_portid;
 117 };
 118
 119 /**
 120  * struct vport_ops - definition of a type of virtual port
 121  *
 122  * @type: %OVS_VPORT_TYPE_* value for this type of virtual port.
 123  * @create: Create a new vport configured as specified.  On success returns
 124  * a new vport allocated with ovs_vport_alloc(), otherwise an ERR_PTR() value.
 125  * @destroy: Destroys a vport.  Must call vport_free() on the vport but not
 126  * before an RCU grace period has elapsed.
 127  * @set_options: Modify the configuration of an existing vport.  May be %NULL
 128  * if modification is not supported.
 129  * @get_options: Appends vport-specific attributes for the configuration of an
 130  * existing vport to a &struct sk_buff.  May be %NULL for a vport that does not
 131  * have any configuration.
 132  * @get_name: Get the device's name.
 133  * @get_config: Get the device's configuration.
 134  * @get_ifindex: Get the system interface index associated with the device.
 135  * May be null if the device does not have an ifindex.
 136  * @send: Send a packet on the device.  Returns the length of the packet sent.
 137  */
 138 struct vport_ops {
 139         enum ovs_vport_type type;
 140
 141         /* Called with RTNL lock. */
 142         struct vport *(*create)(const struct vport_parms *);
 143         void (*destroy)(struct vport *);
 144
 145         int (*set_options)(struct vport *, struct nlattr *);
 146         int (*get_options)(const struct vport *, struct sk_buff *);
 147
 148         /* Called with rcu_read_lock or RTNL lock. */
 149         const char *(*get_name)(const struct vport *);
 150         void (*get_config)(const struct vport *, void *);
 151         int (*get_ifindex)(const struct vport *);
 152
 153         int (*send)(struct vport *, struct sk_buff *);
 154 };
 155
 156 enum vport_err_type {
 157         VPORT_E_RX_DROPPED,
 158         VPORT_E_RX_ERROR,
 159         VPORT_E_TX_DROPPED,
 160         VPORT_E_TX_ERROR,
 161 };
 162
 163 struct vport *ovs_vport_alloc(int priv_size, const struct vport_ops *,
 164                               const struct vport_parms *);
 165 void ovs_vport_free(struct vport *);
 166
 167 #define VPORT_ALIGN 8
 168
 169 /**
 170  *      vport_priv - access private data area of vport
 171  *
 172  * @vport: vport to access
 173  *
 174  * If a nonzero size was passed in priv_size of vport_alloc() a private data
 175  * area was allocated on creation.  This allows that area to be accessed and
 176  * used for any purpose needed by the vport implementer.
 177  */
 178 static inline void *vport_priv(const struct vport *vport)
 179 {
 180         return (u8 *)vport + ALIGN(sizeof(struct vport), VPORT_ALIGN);
 181 }
 182
 183 /**
 184  *      vport_from_priv - lookup vport from private data pointer
 185  *
 186  * @priv: Start of private data area.
 187  *
 188  * It is sometimes useful to translate from a pointer to the private data
 189  * area to the vport, such as in the case where the private data pointer is
 190  * the result of a hash table lookup.  @priv must point to the start of the
 191  * private data area.
 192  */
 193 static inline struct vport *vport_from_priv(const void *priv)
 194 {
 195         return (struct vport *)(priv - ALIGN(sizeof(struct vport), VPORT_ALIGN));
 196 }
 197
 198 void ovs_vport_receive(struct vport *, struct sk_buff *);
 199 void ovs_vport_record_error(struct vport *, enum vport_err_type err_type);
 200
 201 /* List of statically compiled vport implementations.  Don't forget to also
 202  * add yours to the list at the top of vport.c. */
 203 extern const struct vport_ops ovs_netdev_vport_ops;
 204 extern const struct vport_ops ovs_internal_vport_ops;
 205
 206 #endif /* vport.h */