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/skbuff.h> 27 #include <linux/spinlock.h> 28 #include <linux/u64_stats_sync.h> 29 30 #include "datapath.h" 31 32 struct vport; 33 struct vport_parms; 34 35 /* The following definitions are for users of the vport subsytem: */ 36 37 int ovs_vport_init(void); 38 void ovs_vport_exit(void); 39 40 struct vport *ovs_vport_add(const struct vport_parms *); 41 void ovs_vport_del(struct vport *); 42 43 struct vport *ovs_vport_locate(struct net *net, const char *name); 44 45 void ovs_vport_get_stats(struct vport *, struct ovs_vport_stats *); 46 47 int ovs_vport_set_options(struct vport *, struct nlattr *options); 48 int ovs_vport_get_options(const struct vport *, struct sk_buff *); 49 50 int ovs_vport_send(struct vport *, struct sk_buff *); 51 52 /* The following definitions are for implementers of vport devices: */ 53 54 struct vport_err_stats { 55 u64 rx_dropped; 56 u64 rx_errors; 57 u64 tx_dropped; 58 u64 tx_errors; 59 }; 60 61 /** 62 * struct vport - one port within a datapath 63 * @rcu: RCU callback head for deferred destruction. 64 * @dp: Datapath to which this port belongs. 65 * @upcall_portid: The Netlink port to use for packets received on this port that 66 * miss the flow table. 67 * @port_no: Index into @dp's @ports array. 68 * @hash_node: Element in @dev_table hash table in vport.c. 69 * @dp_hash_node: Element in @datapath->ports hash table in datapath.c. 70 * @ops: Class structure. 71 * @percpu_stats: Points to per-CPU statistics used and maintained by vport 72 * @stats_lock: Protects @err_stats; 73 * @err_stats: Points to error statistics used and maintained by vport 74 */ 75 struct vport { 76 struct rcu_head rcu; 77 struct datapath *dp; 78 u32 upcall_portid; 79 u16 port_no; 80 81 struct hlist_node hash_node; 82 struct hlist_node dp_hash_node; 83 const struct vport_ops *ops; 84 85 struct pcpu_tstats __percpu *percpu_stats; 86 87 spinlock_t stats_lock; 88 struct vport_err_stats err_stats; 89 }; 90 91 /** 92 * struct vport_parms - parameters for creating a new vport 93 * 94 * @name: New vport's name. 95 * @type: New vport's type. 96 * @options: %OVS_VPORT_ATTR_OPTIONS attribute from Netlink message, %NULL if 97 * none was supplied. 98 * @dp: New vport's datapath. 99 * @port_no: New vport's port number. 100 */ 101 struct vport_parms { 102 const char *name; 103 enum ovs_vport_type type; 104 struct nlattr *options; 105 106 /* For ovs_vport_alloc(). */ 107 struct datapath *dp; 108 u16 port_no; 109 u32 upcall_portid; 110 }; 111 112 /** 113 * struct vport_ops - definition of a type of virtual port 114 * 115 * @type: %OVS_VPORT_TYPE_* value for this type of virtual port. 116 * @create: Create a new vport configured as specified. On success returns 117 * a new vport allocated with ovs_vport_alloc(), otherwise an ERR_PTR() value. 118 * @destroy: Destroys a vport. Must call vport_free() on the vport but not 119 * before an RCU grace period has elapsed. 120 * @set_options: Modify the configuration of an existing vport. May be %NULL 121 * if modification is not supported. 122 * @get_options: Appends vport-specific attributes for the configuration of an 123 * existing vport to a &struct sk_buff. May be %NULL for a vport that does not 124 * have any configuration. 125 * @get_name: Get the device's name. 126 * @send: Send a packet on the device. Returns the length of the packet sent, 127 * zero for dropped packets or negative for error. 128 */ 129 struct vport_ops { 130 enum ovs_vport_type type; 131 132 /* Called with ovs_mutex. */ 133 struct vport *(*create)(const struct vport_parms *); 134 void (*destroy)(struct vport *); 135 136 int (*set_options)(struct vport *, struct nlattr *); 137 int (*get_options)(const struct vport *, struct sk_buff *); 138 139 /* Called with rcu_read_lock or ovs_mutex. */ 140 const char *(*get_name)(const struct vport *); 141 142 int (*send)(struct vport *, struct sk_buff *); 143 }; 144 145 enum vport_err_type { 146 VPORT_E_RX_DROPPED, 147 VPORT_E_RX_ERROR, 148 VPORT_E_TX_DROPPED, 149 VPORT_E_TX_ERROR, 150 }; 151 152 struct vport *ovs_vport_alloc(int priv_size, const struct vport_ops *, 153 const struct vport_parms *); 154 void ovs_vport_free(struct vport *); 155 156 #define VPORT_ALIGN 8 157 158 /** 159 * vport_priv - access private data area of vport 160 * 161 * @vport: vport to access 162 * 163 * If a nonzero size was passed in priv_size of vport_alloc() a private data 164 * area was allocated on creation. This allows that area to be accessed and 165 * used for any purpose needed by the vport implementer. 166 */ 167 static inline void *vport_priv(const struct vport *vport) 168 { 169 return (u8 *)vport + ALIGN(sizeof(struct vport), VPORT_ALIGN); 170 } 171 172 /** 173 * vport_from_priv - lookup vport from private data pointer 174 * 175 * @priv: Start of private data area. 176 * 177 * It is sometimes useful to translate from a pointer to the private data 178 * area to the vport, such as in the case where the private data pointer is 179 * the result of a hash table lookup. @priv must point to the start of the 180 * private data area. 181 */ 182 static inline struct vport *vport_from_priv(const void *priv) 183 { 184 return (struct vport *)(priv - ALIGN(sizeof(struct vport), VPORT_ALIGN)); 185 } 186 187 void ovs_vport_receive(struct vport *, struct sk_buff *, 188 struct ovs_key_ipv4_tunnel *); 189 void ovs_vport_record_error(struct vport *, enum vport_err_type err_type); 190 191 /* List of statically compiled vport implementations. Don't forget to also 192 * add yours to the list at the top of vport.c. */ 193 extern const struct vport_ops ovs_netdev_vport_ops; 194 extern const struct vport_ops ovs_internal_vport_ops; 195 196 static inline void ovs_skb_postpush_rcsum(struct sk_buff *skb, 197 const void *start, unsigned int len) 198 { 199 if (skb->ip_summed == CHECKSUM_COMPLETE) 200 skb->csum = csum_add(skb->csum, csum_partial(start, len, 0)); 201 } 202 203 #endif /* vport.h */ 204