2 * Copyright (c) 2009, 2010 Nicira Networks.
3 * Distributed under the terms of the GNU GPL version 2.
5 * Significant portions of this file may be copied from parts of the Linux
6 * kernel, by Linus Torvalds and others.
9 /* Interface exported by openvswitch_mod. */
15 #include <linux/kernel.h>
16 #include <linux/mutex.h>
17 #include <linux/netdevice.h>
18 #include <linux/workqueue.h>
19 #include <linux/seqlock.h>
20 #include <linux/skbuff.h>
21 #include <linux/version.h>
27 /* Mask for the priority bits in a vlan header. If we ever merge upstream
28 * then this should go into include/linux/if_vlan.h. */
29 #define VLAN_PCP_MASK 0xe000
30 #define VLAN_PCP_SHIFT 13
32 #define DP_MAX_PORTS 1024
35 #define DP_MAX_QUEUE_LEN 100
38 * struct dp_stats_percpu - per-cpu packet processing statistics for a given
40 * @n_frags: Number of IP fragments processed by datapath.
41 * @n_hit: Number of received packets for which a matching flow was found in
43 * @n_miss: Number of received packets that had no matching flow in the flow
44 * table. The sum of @n_hit and @n_miss is the number of packets that have
45 * been received by the datapath.
46 * @n_lost: Number of received packets that had no matching flow in the flow
47 * table that could not be sent to userspace (normally due to an overflow in
48 * one of the datapath's queues).
50 struct dp_stats_percpu {
59 * struct datapath - datapath for flow-based packet switching
60 * @mutex: Mutual exclusion for ioctls.
61 * @dp_idx: Datapath number (index into the dps[] array in datapath.c).
62 * @ifobj: Represents /sys/class/net/<devname>/brif.
63 * @drop_frags: Drop all IP fragments if nonzero.
64 * @queues: %DP_N_QUEUES sets of queued packets for userspace to handle.
65 * @waitqueue: Waitqueue, for waiting for new packets in @queues.
66 * @n_flows: Number of flows currently in flow table.
67 * @table: Current flow table (RCU protected).
68 * @n_ports: Number of ports currently in @ports.
69 * @ports: Map from port number to &struct vport. %ODPP_LOCAL port
70 * always exists, other ports may be %NULL.
71 * @port_list: List of all ports in @ports in arbitrary order.
72 * @stats_percpu: Per-CPU datapath statistics.
73 * @sflow_probability: Number of packets out of UINT_MAX to sample to the
74 * %ODPL_SFLOW queue, e.g. (@sflow_probability/UINT_MAX) is the probability of
75 * sampling a given packet.
85 struct sk_buff_head queues[DP_N_QUEUES];
86 wait_queue_head_t waitqueue;
93 struct vport *ports[DP_MAX_PORTS];
94 struct list_head port_list;
97 struct dp_stats_percpu *stats_percpu;
100 unsigned int sflow_probability;
105 OVS_CSUM_UNNECESSARY = 1,
106 OVS_CSUM_COMPLETE = 2,
107 OVS_CSUM_PARTIAL = 3,
111 * struct ovs_skb_cb - OVS data in skb CB
112 * @vport: The datapath port on which the skb entered the switch.
113 * @flow: The flow associated with this packet. May be %NULL if no flow.
114 * @ip_summed: Consistently stores L4 checksumming status across different
116 * @tun_id: ID (in network byte order) of the tunnel that encapsulated this
117 * packet. It is 0 if the packet was not received on a tunnel.
121 struct sw_flow *flow;
122 enum csum_type ip_summed;
125 #define OVS_CB(skb) ((struct ovs_skb_cb *)(skb)->cb)
127 extern struct notifier_block dp_device_notifier;
128 extern int (*dp_ioctl_hook)(struct net_device *dev, struct ifreq *rq, int cmd);
130 void dp_process_received_packet(struct vport *, struct sk_buff *);
131 int dp_detach_port(struct vport *);
132 int dp_output_control(struct datapath *, struct sk_buff *, int, u32 arg);
133 int dp_min_mtu(const struct datapath *dp);
134 void set_internal_devs_mtu(const struct datapath *dp);
136 struct datapath *get_dp(int dp_idx);
137 const char *dp_name(const struct datapath *dp);
139 #if defined(CONFIG_XEN) && defined(HAVE_PROTO_DATA_VALID)
140 int vswitch_skb_checksum_setup(struct sk_buff *skb);
142 static inline int vswitch_skb_checksum_setup(struct sk_buff *skb)
148 void compute_ip_summed(struct sk_buff *skb, bool xmit);
149 void forward_ip_summed(struct sk_buff *skb);
151 #endif /* datapath.h */