159 lines
4.6 KiB
C
159 lines
4.6 KiB
C
/*
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* Copyright (c) 2007-2012 Nicira, Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA
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*/
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#ifndef DATAPATH_H
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#define DATAPATH_H 1
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#include <asm/page.h>
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#include <linux/kernel.h>
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#include <linux/mutex.h>
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#include <linux/netdevice.h>
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#include <linux/skbuff.h>
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#include <linux/u64_stats_sync.h>
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#include "flow.h"
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#include "vport.h"
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#define DP_MAX_PORTS USHRT_MAX
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#define DP_VPORT_HASH_BUCKETS 1024
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#define SAMPLE_ACTION_DEPTH 3
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/**
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* struct dp_stats_percpu - per-cpu packet processing statistics for a given
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* datapath.
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* @n_hit: Number of received packets for which a matching flow was found in
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* the flow table.
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* @n_miss: Number of received packets that had no matching flow in the flow
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* table. The sum of @n_hit and @n_miss is the number of packets that have
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* been received by the datapath.
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* @n_lost: Number of received packets that had no matching flow in the flow
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* table that could not be sent to userspace (normally due to an overflow in
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* one of the datapath's queues).
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*/
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struct dp_stats_percpu {
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u64 n_hit;
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u64 n_missed;
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u64 n_lost;
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struct u64_stats_sync sync;
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};
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/**
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* struct datapath - datapath for flow-based packet switching
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* @rcu: RCU callback head for deferred destruction.
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* @list_node: Element in global 'dps' list.
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* @n_flows: Number of flows currently in flow table.
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* @table: Current flow table. Protected by genl_lock and RCU.
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* @ports: Hash table for ports. %OVSP_LOCAL port always exists. Protected by
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* RTNL and RCU.
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* @stats_percpu: Per-CPU datapath statistics.
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* @net: Reference to net namespace.
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*
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* Context: See the comment on locking at the top of datapath.c for additional
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* locking information.
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*/
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struct datapath {
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struct rcu_head rcu;
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struct list_head list_node;
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/* Flow table. */
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struct flow_table __rcu *table;
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/* Switch ports. */
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struct hlist_head *ports;
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/* Stats. */
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struct dp_stats_percpu __percpu *stats_percpu;
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#ifdef CONFIG_NET_NS
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/* Network namespace ref. */
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struct net *net;
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#endif
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};
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struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no);
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static inline struct vport *ovs_vport_rcu(const struct datapath *dp, int port_no)
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{
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WARN_ON_ONCE(!rcu_read_lock_held());
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return ovs_lookup_vport(dp, port_no);
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}
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static inline struct vport *ovs_vport_rtnl_rcu(const struct datapath *dp, int port_no)
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{
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WARN_ON_ONCE(!rcu_read_lock_held() && !rtnl_is_locked());
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return ovs_lookup_vport(dp, port_no);
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}
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static inline struct vport *ovs_vport_rtnl(const struct datapath *dp, int port_no)
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{
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ASSERT_RTNL();
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return ovs_lookup_vport(dp, port_no);
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}
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/**
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* struct ovs_skb_cb - OVS data in skb CB
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* @flow: The flow associated with this packet. May be %NULL if no flow.
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*/
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struct ovs_skb_cb {
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struct sw_flow *flow;
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};
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#define OVS_CB(skb) ((struct ovs_skb_cb *)(skb)->cb)
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/**
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* struct dp_upcall - metadata to include with a packet to send to userspace
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* @cmd: One of %OVS_PACKET_CMD_*.
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* @key: Becomes %OVS_PACKET_ATTR_KEY. Must be nonnull.
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* @userdata: If nonnull, its u64 value is extracted and passed to userspace as
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* %OVS_PACKET_ATTR_USERDATA.
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* @pid: Netlink PID to which packet should be sent. If @pid is 0 then no
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* packet is sent and the packet is accounted in the datapath's @n_lost
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* counter.
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*/
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struct dp_upcall_info {
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u8 cmd;
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const struct sw_flow_key *key;
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const struct nlattr *userdata;
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u32 portid;
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};
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static inline struct net *ovs_dp_get_net(struct datapath *dp)
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{
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return read_pnet(&dp->net);
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}
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static inline void ovs_dp_set_net(struct datapath *dp, struct net *net)
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{
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write_pnet(&dp->net, net);
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}
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extern struct notifier_block ovs_dp_device_notifier;
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extern struct genl_multicast_group ovs_dp_vport_multicast_group;
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void ovs_dp_process_received_packet(struct vport *, struct sk_buff *);
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void ovs_dp_detach_port(struct vport *);
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int ovs_dp_upcall(struct datapath *, struct sk_buff *,
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const struct dp_upcall_info *);
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const char *ovs_dp_name(const struct datapath *dp);
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struct sk_buff *ovs_vport_cmd_build_info(struct vport *, u32 pid, u32 seq,
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u8 cmd);
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int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb);
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#endif /* datapath.h */
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