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