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Diffstat (limited to 'kernel/net/openvswitch/vport.h')
| -rw-r--r-- | kernel/net/openvswitch/vport.h | 259 |
1 files changed, 259 insertions, 0 deletions
diff --git a/kernel/net/openvswitch/vport.h b/kernel/net/openvswitch/vport.h new file mode 100644 index 000000000..bc85331a6 --- /dev/null +++ b/kernel/net/openvswitch/vport.h @@ -0,0 +1,259 @@ +/* + * Copyright (c) 2007-2012 Nicira, Inc. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA + */ + +#ifndef VPORT_H +#define VPORT_H 1 + +#include <linux/if_tunnel.h> +#include <linux/list.h> +#include <linux/netlink.h> +#include <linux/openvswitch.h> +#include <linux/reciprocal_div.h> +#include <linux/skbuff.h> +#include <linux/spinlock.h> +#include <linux/u64_stats_sync.h> + +#include "datapath.h" + +struct vport; +struct vport_parms; + +/* The following definitions are for users of the vport subsytem: */ + +struct vport_net { + struct vport __rcu *gre_vport; +}; + +int ovs_vport_init(void); +void ovs_vport_exit(void); + +struct vport *ovs_vport_add(const struct vport_parms *); +void ovs_vport_del(struct vport *); + +struct vport *ovs_vport_locate(const struct net *net, const char *name); + +void ovs_vport_get_stats(struct vport *, struct ovs_vport_stats *); + +int ovs_vport_set_options(struct vport *, struct nlattr *options); +int ovs_vport_get_options(const struct vport *, struct sk_buff *); + +int ovs_vport_set_upcall_portids(struct vport *, const struct nlattr *pids); +int ovs_vport_get_upcall_portids(const struct vport *, struct sk_buff *); +u32 ovs_vport_find_upcall_portid(const struct vport *, struct sk_buff *); + +int ovs_vport_send(struct vport *, struct sk_buff *); + +int ovs_tunnel_get_egress_info(struct ovs_tunnel_info *egress_tun_info, + struct net *net, + const struct ovs_tunnel_info *tun_info, + u8 ipproto, + u32 skb_mark, + __be16 tp_src, + __be16 tp_dst); +int ovs_vport_get_egress_tun_info(struct vport *vport, struct sk_buff *skb, + struct ovs_tunnel_info *info); + +/* The following definitions are for implementers of vport devices: */ + +struct vport_err_stats { + atomic_long_t rx_dropped; + atomic_long_t rx_errors; + atomic_long_t tx_dropped; + atomic_long_t tx_errors; +}; +/** + * struct vport_portids - array of netlink portids of a vport. + * must be protected by rcu. + * @rn_ids: The reciprocal value of @n_ids. + * @rcu: RCU callback head for deferred destruction. + * @n_ids: Size of @ids array. + * @ids: Array storing the Netlink socket pids to be used for packets received + * on this port that miss the flow table. + */ +struct vport_portids { + struct reciprocal_value rn_ids; + struct rcu_head rcu; + u32 n_ids; + u32 ids[]; +}; + +/** + * struct vport - one port within a datapath + * @rcu: RCU callback head for deferred destruction. + * @dp: Datapath to which this port belongs. + * @upcall_portids: RCU protected 'struct vport_portids'. + * @port_no: Index into @dp's @ports array. + * @hash_node: Element in @dev_table hash table in vport.c. + * @dp_hash_node: Element in @datapath->ports hash table in datapath.c. + * @ops: Class structure. + * @percpu_stats: Points to per-CPU statistics used and maintained by vport + * @err_stats: Points to error statistics used and maintained by vport + * @detach_list: list used for detaching vport in net-exit call. + */ +struct vport { + struct rcu_head rcu; + struct datapath *dp; + struct vport_portids __rcu *upcall_portids; + u16 port_no; + + struct hlist_node hash_node; + struct hlist_node dp_hash_node; + const struct vport_ops *ops; + + struct pcpu_sw_netstats __percpu *percpu_stats; + + struct vport_err_stats err_stats; + struct list_head detach_list; +}; + +/** + * struct vport_parms - parameters for creating a new vport + * + * @name: New vport's name. + * @type: New vport's type. + * @options: %OVS_VPORT_ATTR_OPTIONS attribute from Netlink message, %NULL if + * none was supplied. + * @dp: New vport's datapath. + * @port_no: New vport's port number. + */ +struct vport_parms { + const char *name; + enum ovs_vport_type type; + struct nlattr *options; + + /* For ovs_vport_alloc(). */ + struct datapath *dp; + u16 port_no; + struct nlattr *upcall_portids; +}; + +/** + * struct vport_ops - definition of a type of virtual port + * + * @type: %OVS_VPORT_TYPE_* value for this type of virtual port. + * @create: Create a new vport configured as specified. On success returns + * a new vport allocated with ovs_vport_alloc(), otherwise an ERR_PTR() value. + * @destroy: Destroys a vport. Must call vport_free() on the vport but not + * before an RCU grace period has elapsed. + * @set_options: Modify the configuration of an existing vport. May be %NULL + * if modification is not supported. + * @get_options: Appends vport-specific attributes for the configuration of an + * existing vport to a &struct sk_buff. May be %NULL for a vport that does not + * have any configuration. + * @get_name: Get the device's name. + * @send: Send a packet on the device. Returns the length of the packet sent, + * zero for dropped packets or negative for error. + * @get_egress_tun_info: Get the egress tunnel 5-tuple and other info for + * a packet. + */ +struct vport_ops { + enum ovs_vport_type type; + + /* Called with ovs_mutex. */ + struct vport *(*create)(const struct vport_parms *); + void (*destroy)(struct vport *); + + int (*set_options)(struct vport *, struct nlattr *); + int (*get_options)(const struct vport *, struct sk_buff *); + + /* Called with rcu_read_lock or ovs_mutex. */ + const char *(*get_name)(const struct vport *); + + int (*send)(struct vport *, struct sk_buff *); + int (*get_egress_tun_info)(struct vport *, struct sk_buff *, + struct ovs_tunnel_info *); + + struct module *owner; + struct list_head list; +}; + +enum vport_err_type { + VPORT_E_RX_DROPPED, + VPORT_E_RX_ERROR, + VPORT_E_TX_DROPPED, + VPORT_E_TX_ERROR, +}; + +struct vport *ovs_vport_alloc(int priv_size, const struct vport_ops *, + const struct vport_parms *); +void ovs_vport_free(struct vport *); +void ovs_vport_deferred_free(struct vport *vport); + +#define VPORT_ALIGN 8 + +/** + * vport_priv - access private data area of vport + * + * @vport: vport to access + * + * If a nonzero size was passed in priv_size of vport_alloc() a private data + * area was allocated on creation. This allows that area to be accessed and + * used for any purpose needed by the vport implementer. + */ +static inline void *vport_priv(const struct vport *vport) +{ + return (u8 *)(uintptr_t)vport + ALIGN(sizeof(struct vport), VPORT_ALIGN); +} + +/** + * vport_from_priv - lookup vport from private data pointer + * + * @priv: Start of private data area. + * + * It is sometimes useful to translate from a pointer to the private data + * area to the vport, such as in the case where the private data pointer is + * the result of a hash table lookup. @priv must point to the start of the + * private data area. + */ +static inline struct vport *vport_from_priv(void *priv) +{ + return (struct vport *)((u8 *)priv - ALIGN(sizeof(struct vport), VPORT_ALIGN)); +} + +void ovs_vport_receive(struct vport *, struct sk_buff *, + const struct ovs_tunnel_info *); + +static inline void ovs_skb_postpush_rcsum(struct sk_buff *skb, + const void *start, unsigned int len) +{ + if (skb->ip_summed == CHECKSUM_COMPLETE) + skb->csum = csum_add(skb->csum, csum_partial(start, len, 0)); +} + +int ovs_vport_ops_register(struct vport_ops *ops); +void ovs_vport_ops_unregister(struct vport_ops *ops); + +static inline struct rtable *ovs_tunnel_route_lookup(struct net *net, + const struct ovs_key_ipv4_tunnel *key, + u32 mark, + struct flowi4 *fl, + u8 protocol) +{ + struct rtable *rt; + + memset(fl, 0, sizeof(*fl)); + fl->daddr = key->ipv4_dst; + fl->saddr = key->ipv4_src; + fl->flowi4_tos = RT_TOS(key->ipv4_tos); + fl->flowi4_mark = mark; + fl->flowi4_proto = protocol; + + rt = ip_route_output_key(net, fl); + return rt; +} +#endif /* vport.h */ |