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         struct vport __rcu *gre64_vport;
  38 };
  39
  40 int ovs_vport_init(void);
  41 void ovs_vport_exit(void);
  42
  43 struct vport *ovs_vport_add(const struct vport_parms *);
  44 void ovs_vport_del(struct vport *);
  45
  46 struct vport *ovs_vport_locate(struct net *net, const char *name);
  47
  48 void ovs_vport_set_stats(struct vport *, struct ovs_vport_stats *);
  49 void ovs_vport_get_stats(struct vport *, struct ovs_vport_stats *);
  50
  51 int ovs_vport_set_options(struct vport *, struct nlattr *options);
  52 int ovs_vport_get_options(const struct vport *, struct sk_buff *);
  53
  54 int ovs_vport_set_upcall_portids(struct vport *, struct nlattr *pids);
  55 int ovs_vport_get_upcall_portids(const struct vport *, struct sk_buff *);
  56 u32 ovs_vport_find_upcall_portid(const struct vport *, struct sk_buff *);
  57
  58 int ovs_vport_send(struct vport *, struct sk_buff *);
  59
  60 /* The following definitions are for implementers of vport devices: */
  61
  62 struct vport_err_stats {
  63         u64 rx_dropped;
  64         u64 rx_errors;
  65         u64 tx_dropped;
  66         u64 tx_errors;
  67 };
  68 /**
  69  * struct vport_portids - array of netlink portids of a vport.
  70  *                        must be protected by rcu.
  71  * @rn_ids: The reciprocal value of @n_ids.
  72  * @rcu: RCU callback head for deferred destruction.
  73  * @n_ids: Size of @ids array.
  74  * @ids: Array storing the Netlink socket pids to be used for packets received
  75  * on this port that miss the flow table.
  76  */
  77 struct vport_portids {
  78         struct reciprocal_value rn_ids;
  79         struct rcu_head rcu;
  80         u32 n_ids;
  81         u32 ids[];
  82 };
  83
  84 /**
  85  * struct vport - one port within a datapath
  86  * @rcu: RCU callback head for deferred destruction.
  87  * @dp: Datapath to which this port belongs.
  88  * @upcall_portids: RCU protected 'struct vport_portids'.
  89  * @port_no: Index into @dp's @ports array.
  90  * @hash_node: Element in @dev_table hash table in vport.c.
  91  * @dp_hash_node: Element in @datapath->ports hash table in datapath.c.
  92  * @ops: Class structure.
  93  * @percpu_stats: Points to per-CPU statistics used and maintained by vport
  94  * @stats_lock: Protects @err_stats and @offset_stats.
  95  * @err_stats: Points to error statistics used and maintained by vport
  96  * @offset_stats: Added to actual statistics as a sop to compatibility with
  97  * XAPI for Citrix XenServer.  Deprecated.
  98  */
  99 struct vport {
 100         struct rcu_head rcu;
 101         struct datapath *dp;
 102         struct vport_portids __rcu *upcall_portids;
 103         u16 port_no;
 104
 105         struct hlist_node hash_node;
 106         struct hlist_node dp_hash_node;
 107         const struct vport_ops *ops;
 108
 109         struct pcpu_sw_netstats __percpu *percpu_stats;
 110
 111         spinlock_t stats_lock;
 112         struct vport_err_stats err_stats;
 113         struct ovs_vport_stats offset_stats;
 114 };
 115
 116 /**
 117  * struct vport_parms - parameters for creating a new vport
 118  *
 119  * @name: New vport's name.
 120  * @type: New vport's type.
 121  * @options: %OVS_VPORT_ATTR_OPTIONS attribute from Netlink message, %NULL if
 122  * none was supplied.
 123  * @dp: New vport's datapath.
 124  * @port_no: New vport's port number.
 125  */
 126 struct vport_parms {
 127         const char *name;
 128         enum ovs_vport_type type;
 129         struct nlattr *options;
 130
 131         /* For ovs_vport_alloc(). */
 132         struct datapath *dp;
 133         u16 port_no;
 134         struct nlattr *upcall_portids;
 135 };
 136
 137 /**
 138  * struct vport_ops - definition of a type of virtual port
 139  *
 140  * @type: %OVS_VPORT_TYPE_* value for this type of virtual port.
 141  * @create: Create a new vport configured as specified.  On success returns
 142  * a new vport allocated with ovs_vport_alloc(), otherwise an ERR_PTR() value.
 143  * @destroy: Destroys a vport.  Must call vport_free() on the vport but not
 144  * before an RCU grace period has elapsed.
 145  * @set_options: Modify the configuration of an existing vport.  May be %NULL
 146  * if modification is not supported.
 147  * @get_options: Appends vport-specific attributes for the configuration of an
 148  * existing vport to a &struct sk_buff.  May be %NULL for a vport that does not
 149  * have any configuration.
 150  * @get_name: Get the device's name.
 151  * @send: Send a packet on the device.  Returns the length of the packet sent,
 152  * zero for dropped packets or negative for error.
 153  */
 154 struct vport_ops {
 155         enum ovs_vport_type type;
 156
 157         /* Called with ovs_mutex. */
 158         struct vport *(*create)(const struct vport_parms *);
 159         void (*destroy)(struct vport *);
 160
 161         int (*set_options)(struct vport *, struct nlattr *);
 162         int (*get_options)(const struct vport *, struct sk_buff *);
 163
 164         /* Called with rcu_read_lock or ovs_mutex. */
 165         const char *(*get_name)(const struct vport *);
 166
 167         int (*send)(struct vport *, struct sk_buff *);
 168 };
 169
 170 enum vport_err_type {
 171         VPORT_E_RX_DROPPED,
 172         VPORT_E_RX_ERROR,
 173         VPORT_E_TX_DROPPED,
 174         VPORT_E_TX_ERROR,
 175 };
 176
 177 struct vport *ovs_vport_alloc(int priv_size, const struct vport_ops *,
 178                               const struct vport_parms *);
 179 void ovs_vport_free(struct vport *);
 180 void ovs_vport_deferred_free(struct vport *vport);
 181
 182 #define VPORT_ALIGN 8
 183
 184 /**
 185  *      vport_priv - access private data area of vport
 186  *
 187  * @vport: vport to access
 188  *
 189  * If a nonzero size was passed in priv_size of vport_alloc() a private data
 190  * area was allocated on creation.  This allows that area to be accessed and
 191  * used for any purpose needed by the vport implementer.
 192  */
 193 static inline void *vport_priv(const struct vport *vport)
 194 {
 195         return (u8 *)(uintptr_t)vport + ALIGN(sizeof(struct vport), VPORT_ALIGN);
 196 }
 197
 198 /**
 199  *      vport_from_priv - lookup vport from private data pointer
 200  *
 201  * @priv: Start of private data area.
 202  *
 203  * It is sometimes useful to translate from a pointer to the private data
 204  * area to the vport, such as in the case where the private data pointer is
 205  * the result of a hash table lookup.  @priv must point to the start of the
 206  * private data area.
 207  */
 208 static inline struct vport *vport_from_priv(void *priv)
 209 {
 210         return (struct vport *)((u8 *)priv - ALIGN(sizeof(struct vport), VPORT_ALIGN));
 211 }
 212
 213 void ovs_vport_receive(struct vport *, struct sk_buff *,
 214                        struct ovs_tunnel_info *);
 215
 216 /* List of statically compiled vport implementations.  Don't forget to also
 217  * add yours to the list at the top of vport.c. */
 218 extern const struct vport_ops ovs_netdev_vport_ops;
 219 extern const struct vport_ops ovs_internal_vport_ops;
 220 extern const struct vport_ops ovs_gre_vport_ops;
 221 extern const struct vport_ops ovs_gre64_vport_ops;
 222 extern const struct vport_ops ovs_vxlan_vport_ops;
 223 extern const struct vport_ops ovs_lisp_vport_ops;
 224
 225 static inline void ovs_skb_postpush_rcsum(struct sk_buff *skb,
 226                                       const void *start, unsigned int len)
 227 {
 228         if (skb->ip_summed == CHECKSUM_COMPLETE)
 229                 skb->csum = csum_add(skb->csum, csum_partial(start, len, 0));
 230 }
 231 #endif /* vport.h */