/* * 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(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 *, 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 *); /* 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 */ 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 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. */ 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 *); }; 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 *, struct ovs_tunnel_info *); /* List of statically compiled vport implementations. Don't forget to also * add yours to the list at the top of vport.c. */ extern const struct vport_ops ovs_netdev_vport_ops; extern const struct vport_ops ovs_internal_vport_ops; extern const struct vport_ops ovs_gre_vport_ops; extern const struct vport_ops ovs_vxlan_vport_ops; extern const struct vport_ops ovs_geneve_vport_ops; 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)); } #endif /* vport.h */