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/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>
  30
  31 #include "datapath.h"
  32
  33 struct vport;
  34 struct vport_parms;
  35
  36 /* The following definitions are for users of the vport subsytem: */
  37
  38 struct vport_net {
  39         struct vport __rcu *gre_vport;
  40 };
  41
  42 int ovs_vport_init(void);
  43 void ovs_vport_exit(void);
  44
  45 struct vport *ovs_vport_add(const struct vport_parms *);
  46 void ovs_vport_del(struct vport *);
  47
  48 struct vport *ovs_vport_locate(const struct net *net, const char *name);
  49
  50 void ovs_vport_get_stats(struct vport *, struct ovs_vport_stats *);
  51
  52 int ovs_vport_set_options(struct vport *, struct nlattr *options);
  53 int ovs_vport_get_options(const struct vport *, struct sk_buff *);
  54
  55 int ovs_vport_set_upcall_portids(struct vport *, const struct nlattr *pids);
  56 int ovs_vport_get_upcall_portids(const struct vport *, struct sk_buff *);
  57 u32 ovs_vport_find_upcall_portid(const struct vport *, struct sk_buff *);
  58
  59 int ovs_vport_send(struct vport *, struct sk_buff *);
  60
  61 int ovs_tunnel_get_egress_info(struct ovs_tunnel_info *egress_tun_info,
  62                                struct net *net,
  63                                const struct ovs_tunnel_info *tun_info,
  64                                u8 ipproto,
  65                                u32 skb_mark,
  66                                __be16 tp_src,
  67                                __be16 tp_dst);
  68 int ovs_vport_get_egress_tun_info(struct vport *vport, struct sk_buff *skb,
  69                                   struct ovs_tunnel_info *info);
  70
  71 /* The following definitions are for implementers of vport devices: */
  72
  73 struct vport_err_stats {
  74         atomic_long_t rx_dropped;
  75         atomic_long_t rx_errors;
  76         atomic_long_t tx_dropped;
  77         atomic_long_t tx_errors;
  78 };
  79 /**
  80  * struct vport_portids - array of netlink portids of a vport.
  81  *                        must be protected by rcu.
  82  * @rn_ids: The reciprocal value of @n_ids.
  83  * @rcu: RCU callback head for deferred destruction.
  84  * @n_ids: Size of @ids array.
  85  * @ids: Array storing the Netlink socket pids to be used for packets received
  86  * on this port that miss the flow table.
  87  */
  88 struct vport_portids {
  89         struct reciprocal_value rn_ids;
  90         struct rcu_head rcu;
  91         u32 n_ids;
  92         u32 ids[];
  93 };
  94
  95 /**
  96  * struct vport - one port within a datapath
  97  * @rcu: RCU callback head for deferred destruction.
  98  * @dp: Datapath to which this port belongs.
  99  * @upcall_portids: RCU protected 'struct vport_portids'.
 100  * @port_no: Index into @dp's @ports array.
 101  * @hash_node: Element in @dev_table hash table in vport.c.
 102  * @dp_hash_node: Element in @datapath->ports hash table in datapath.c.
 103  * @ops: Class structure.
 104  * @percpu_stats: Points to per-CPU statistics used and maintained by vport
 105  * @err_stats: Points to error statistics used and maintained by vport
 106  */
 107 struct vport {
 108         struct rcu_head rcu;
 109         struct datapath *dp;
 110         struct vport_portids __rcu *upcall_portids;
 111         u16 port_no;
 112
 113         struct hlist_node hash_node;
 114         struct hlist_node dp_hash_node;
 115         const struct vport_ops *ops;
 116
 117         struct pcpu_sw_netstats __percpu *percpu_stats;
 118
 119         struct vport_err_stats err_stats;
 120 };
 121
 122 /**
 123  * struct vport_parms - parameters for creating a new vport
 124  *
 125  * @name: New vport's name.
 126  * @type: New vport's type.
 127  * @options: %OVS_VPORT_ATTR_OPTIONS attribute from Netlink message, %NULL if
 128  * none was supplied.
 129  * @dp: New vport's datapath.
 130  * @port_no: New vport's port number.
 131  */
 132 struct vport_parms {
 133         const char *name;
 134         enum ovs_vport_type type;
 135         struct nlattr *options;
 136
 137         /* For ovs_vport_alloc(). */
 138         struct datapath *dp;
 139         u16 port_no;
 140         struct nlattr *upcall_portids;
 141 };
 142
 143 /**
 144  * struct vport_ops - definition of a type of virtual port
 145  *
 146  * @type: %OVS_VPORT_TYPE_* value for this type of virtual port.
 147  * @create: Create a new vport configured as specified.  On success returns
 148  * a new vport allocated with ovs_vport_alloc(), otherwise an ERR_PTR() value.
 149  * @destroy: Destroys a vport.  Must call vport_free() on the vport but not
 150  * before an RCU grace period has elapsed.
 151  * @set_options: Modify the configuration of an existing vport.  May be %NULL
 152  * if modification is not supported.
 153  * @get_options: Appends vport-specific attributes for the configuration of an
 154  * existing vport to a &struct sk_buff.  May be %NULL for a vport that does not
 155  * have any configuration.
 156  * @get_name: Get the device's name.
 157  * @send: Send a packet on the device.  Returns the length of the packet sent,
 158  * zero for dropped packets or negative for error.
 159  * @get_egress_tun_info: Get the egress tunnel 5-tuple and other info for
 160  * a packet.
 161  */
 162 struct vport_ops {
 163         enum ovs_vport_type type;
 164
 165         /* Called with ovs_mutex. */
 166         struct vport *(*create)(const struct vport_parms *);
 167         void (*destroy)(struct vport *);
 168
 169         int (*set_options)(struct vport *, struct nlattr *);
 170         int (*get_options)(const struct vport *, struct sk_buff *);
 171
 172         /* Called with rcu_read_lock or ovs_mutex. */
 173         const char *(*get_name)(const struct vport *);
 174
 175         int (*send)(struct vport *, struct sk_buff *);
 176         int (*get_egress_tun_info)(struct vport *, struct sk_buff *,
 177                                    struct ovs_tunnel_info *);
 178
 179         struct module *owner;
 180         struct list_head list;
 181 };
 182
 183 enum vport_err_type {
 184         VPORT_E_RX_DROPPED,
 185         VPORT_E_RX_ERROR,
 186         VPORT_E_TX_DROPPED,
 187         VPORT_E_TX_ERROR,
 188 };
 189
 190 struct vport *ovs_vport_alloc(int priv_size, const struct vport_ops *,
 191                               const struct vport_parms *);
 192 void ovs_vport_free(struct vport *);
 193 void ovs_vport_deferred_free(struct vport *vport);
 194
 195 #define VPORT_ALIGN 8
 196
 197 /**
 198  *      vport_priv - access private data area of vport
 199  *
 200  * @vport: vport to access
 201  *
 202  * If a nonzero size was passed in priv_size of vport_alloc() a private data
 203  * area was allocated on creation.  This allows that area to be accessed and
 204  * used for any purpose needed by the vport implementer.
 205  */
 206 static inline void *vport_priv(const struct vport *vport)
 207 {
 208         return (u8 *)(uintptr_t)vport + ALIGN(sizeof(struct vport), VPORT_ALIGN);
 209 }
 210
 211 /**
 212  *      vport_from_priv - lookup vport from private data pointer
 213  *
 214  * @priv: Start of private data area.
 215  *
 216  * It is sometimes useful to translate from a pointer to the private data
 217  * area to the vport, such as in the case where the private data pointer is
 218  * the result of a hash table lookup.  @priv must point to the start of the
 219  * private data area.
 220  */
 221 static inline struct vport *vport_from_priv(void *priv)
 222 {
 223         return (struct vport *)((u8 *)priv - ALIGN(sizeof(struct vport), VPORT_ALIGN));
 224 }
 225
 226 void ovs_vport_receive(struct vport *, struct sk_buff *,
 227                        const struct ovs_tunnel_info *);
 228
 229 static inline void ovs_skb_postpush_rcsum(struct sk_buff *skb,
 230                                       const void *start, unsigned int len)
 231 {
 232         if (skb->ip_summed == CHECKSUM_COMPLETE)
 233                 skb->csum = csum_add(skb->csum, csum_partial(start, len, 0));
 234 }
 235
 236 int ovs_vport_ops_register(struct vport_ops *ops);
 237 void ovs_vport_ops_unregister(struct vport_ops *ops);
 238
 239 #endif /* vport.h */