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Diffstat (limited to 'net/openvswitch/datapath.h')
| -rw-r--r-- | net/openvswitch/datapath.h | 205 |
1 files changed, 205 insertions, 0 deletions
diff --git a/net/openvswitch/datapath.h b/net/openvswitch/datapath.h new file mode 100644 index 000000000..4ec4a480b --- /dev/null +++ b/net/openvswitch/datapath.h @@ -0,0 +1,205 @@ +/* + * Copyright (c) 2007-2014 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 DATAPATH_H +#define DATAPATH_H 1 + +#include <asm/page.h> +#include <linux/kernel.h> +#include <linux/mutex.h> +#include <linux/netdevice.h> +#include <linux/skbuff.h> +#include <linux/u64_stats_sync.h> + +#include "flow.h" +#include "flow_table.h" +#include "vport.h" + +#define DP_MAX_PORTS USHRT_MAX +#define DP_VPORT_HASH_BUCKETS 1024 + +#define SAMPLE_ACTION_DEPTH 3 + +/** + * struct dp_stats_percpu - per-cpu packet processing statistics for a given + * datapath. + * @n_hit: Number of received packets for which a matching flow was found in + * the flow table. + * @n_miss: Number of received packets that had no matching flow in the flow + * table. The sum of @n_hit and @n_miss is the number of packets that have + * been received by the datapath. + * @n_lost: Number of received packets that had no matching flow in the flow + * table that could not be sent to userspace (normally due to an overflow in + * one of the datapath's queues). + * @n_mask_hit: Number of masks looked up for flow match. + * @n_mask_hit / (@n_hit + @n_missed) will be the average masks looked + * up per packet. + */ +struct dp_stats_percpu { + u64 n_hit; + u64 n_missed; + u64 n_lost; + u64 n_mask_hit; + struct u64_stats_sync syncp; +}; + +/** + * struct datapath - datapath for flow-based packet switching + * @rcu: RCU callback head for deferred destruction. + * @list_node: Element in global 'dps' list. + * @table: flow table. + * @ports: Hash table for ports. %OVSP_LOCAL port always exists. Protected by + * ovs_mutex and RCU. + * @stats_percpu: Per-CPU datapath statistics. + * @net: Reference to net namespace. + * + * Context: See the comment on locking at the top of datapath.c for additional + * locking information. + */ +struct datapath { + struct rcu_head rcu; + struct list_head list_node; + + /* Flow table. */ + struct flow_table table; + + /* Switch ports. */ + struct hlist_head *ports; + + /* Stats. */ + struct dp_stats_percpu __percpu *stats_percpu; + + /* Network namespace ref. */ + possible_net_t net; + + u32 user_features; +}; + +/** + * struct ovs_skb_cb - OVS data in skb CB + * @egress_tun_key: Tunnel information about this packet on egress path. + * NULL if the packet is not being tunneled. + * @input_vport: The original vport packet came in on. This value is cached + * when a packet is received by OVS. + */ +struct ovs_skb_cb { + struct ovs_tunnel_info *egress_tun_info; + struct vport *input_vport; +}; +#define OVS_CB(skb) ((struct ovs_skb_cb *)(skb)->cb) + +/** + * struct dp_upcall - metadata to include with a packet to send to userspace + * @cmd: One of %OVS_PACKET_CMD_*. + * @userdata: If nonnull, its variable-length value is passed to userspace as + * %OVS_PACKET_ATTR_USERDATA. + * @portid: Netlink portid to which packet should be sent. If @portid is 0 + * then no packet is sent and the packet is accounted in the datapath's @n_lost + * counter. + * @egress_tun_info: If nonnull, becomes %OVS_PACKET_ATTR_EGRESS_TUN_KEY. + */ +struct dp_upcall_info { + const struct ovs_tunnel_info *egress_tun_info; + const struct nlattr *userdata; + u32 portid; + u8 cmd; +}; + +/** + * struct ovs_net - Per net-namespace data for ovs. + * @dps: List of datapaths to enable dumping them all out. + * Protected by genl_mutex. + */ +struct ovs_net { + struct list_head dps; + struct work_struct dp_notify_work; + struct vport_net vport_net; +}; + +extern int ovs_net_id; +void ovs_lock(void); +void ovs_unlock(void); + +#ifdef CONFIG_LOCKDEP +int lockdep_ovsl_is_held(void); +#else +#define lockdep_ovsl_is_held() 1 +#endif + +#define ASSERT_OVSL() WARN_ON(!lockdep_ovsl_is_held()) +#define ovsl_dereference(p) \ + rcu_dereference_protected(p, lockdep_ovsl_is_held()) +#define rcu_dereference_ovsl(p) \ + rcu_dereference_check(p, lockdep_ovsl_is_held()) + +static inline struct net *ovs_dp_get_net(const struct datapath *dp) +{ + return read_pnet(&dp->net); +} + +static inline void ovs_dp_set_net(struct datapath *dp, struct net *net) +{ + write_pnet(&dp->net, net); +} + +struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no); + +static inline struct vport *ovs_vport_rcu(const struct datapath *dp, int port_no) +{ + WARN_ON_ONCE(!rcu_read_lock_held()); + return ovs_lookup_vport(dp, port_no); +} + +static inline struct vport *ovs_vport_ovsl_rcu(const struct datapath *dp, int port_no) +{ + WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held()); + return ovs_lookup_vport(dp, port_no); +} + +static inline struct vport *ovs_vport_ovsl(const struct datapath *dp, int port_no) +{ + ASSERT_OVSL(); + return ovs_lookup_vport(dp, port_no); +} + +extern struct notifier_block ovs_dp_device_notifier; +extern struct genl_family dp_vport_genl_family; + +void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key); +void ovs_dp_detach_port(struct vport *); +int ovs_dp_upcall(struct datapath *, struct sk_buff *, + const struct sw_flow_key *, const struct dp_upcall_info *); + +const char *ovs_dp_name(const struct datapath *dp); +struct sk_buff *ovs_vport_cmd_build_info(struct vport *, u32 pid, u32 seq, + u8 cmd); + +int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb, + const struct sw_flow_actions *, struct sw_flow_key *); + +void ovs_dp_notify_wq(struct work_struct *work); + +int action_fifos_init(void); +void action_fifos_exit(void); + +#define OVS_NLERR(logging_allowed, fmt, ...) \ +do { \ + if (logging_allowed && net_ratelimit()) \ + pr_info("netlink: " fmt "\n", ##__VA_ARGS__); \ +} while (0) +#endif /* datapath.h */ |