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>
28 /* Mask for the priority bits in a vlan header. If we ever merge upstream
29 * then this should go into include/linux/if_vlan.h. */
30 #define VLAN_PCP_MASK 0xe000
31 #define VLAN_PCP_SHIFT 13
33 #define DP_MAX_PORTS 1024
36 #define DP_MAX_QUEUE_LEN 100
39 * struct dp_stats_percpu - per-cpu packet processing statistics for a given
41 * @n_frags: Number of IP fragments processed by datapath.
42 * @n_hit: Number of received packets for which a matching flow was found in
44 * @n_miss: Number of received packets that had no matching flow in the flow
45 * table. The sum of @n_hit and @n_miss is the number of packets that have
46 * been received by the datapath.
47 * @n_lost: Number of received packets that had no matching flow in the flow
48 * table that could not be sent to userspace (normally due to an overflow in
49 * one of the datapath's queues).
51 struct dp_stats_percpu {
60 * struct datapath - datapath for flow-based packet switching
61 * @mutex: Mutual exclusion for ioctls.
62 * @dp_idx: Datapath number (index into the dps[] array in datapath.c).
63 * @ifobj: Represents /sys/class/net/<devname>/brif.
64 * @drop_frags: Drop all IP fragments if nonzero.
65 * @queues: %DP_N_QUEUES sets of queued packets for userspace to handle.
66 * @waitqueue: Waitqueue, for waiting for new packets in @queues.
67 * @n_flows: Number of flows currently in flow table.
68 * @table: Current flow table (RCU protected).
69 * @n_ports: Number of ports currently in @ports.
70 * @ports: Map from port number to &struct dp_port. %ODPP_LOCAL port
71 * always exists, other ports may be %NULL.
72 * @port_list: List of all ports in @ports in arbitrary order.
73 * @stats_percpu: Per-CPU datapath statistics.
74 * @sflow_probability: Number of packets out of UINT_MAX to sample to the
75 * %ODPL_SFLOW queue, e.g. (@sflow_probability/UINT_MAX) is the probability of
76 * sampling a given packet.
86 struct sk_buff_head queues[DP_N_QUEUES];
87 wait_queue_head_t waitqueue;
94 struct dp_port *ports[DP_MAX_PORTS];
95 struct list_head port_list;
98 struct dp_stats_percpu *stats_percpu;
101 unsigned int sflow_probability;
105 * struct dp_port - one port within a datapath
106 * @port_no: Index into @dp's @ports array.
107 * @dp: Datapath to which this port belongs.
108 * @vport: The network device attached to this port. The contents depends on
109 * the device and should be accessed only through the vport_* functions.
110 * @kobj: Represents /sys/class/net/<devname>/brport.
111 * @linkname: The name of the link from /sys/class/net/<datapath>/brif to this
112 * &struct dp_port. (We keep this around so that we can delete it if the
113 * device gets renamed.) Set to the null string when no link exists.
114 * @node: Element in @dp's @port_list.
115 * @sflow_pool: Number of packets that were candidates for sFlow sampling,
116 * regardless of whether they were actually chosen and sent down to userspace.
123 char linkname[IFNAMSIZ];
124 struct list_head node;
130 OVS_CSUM_UNNECESSARY = 1,
131 OVS_CSUM_COMPLETE = 2,
132 OVS_CSUM_PARTIAL = 3,
136 * struct ovs_skb_cb - OVS data in skb CB
137 * @dp_port: The datapath port on which the skb entered the switch.
138 * @flow: The flow associated with this packet. May be %NULL if no flow.
139 * @ip_summed: Consistently stores L4 checksumming status across different
141 * @tun_id: ID (in network byte order) of the tunnel that encapsulated this
142 * packet. It is 0 if the packet was not received on a tunnel.
145 struct dp_port *dp_port;
146 struct sw_flow *flow;
147 enum csum_type ip_summed;
150 #define OVS_CB(skb) ((struct ovs_skb_cb *)(skb)->cb)
152 extern struct notifier_block dp_device_notifier;
153 extern int (*dp_ioctl_hook)(struct net_device *dev, struct ifreq *rq, int cmd);
155 void dp_process_received_packet(struct dp_port *, struct sk_buff *);
156 int dp_detach_port(struct dp_port *, int may_delete);
157 int dp_output_control(struct datapath *, struct sk_buff *, int, u32 arg);
158 int dp_min_mtu(const struct datapath *dp);
159 void set_internal_devs_mtu(const struct datapath *dp);
161 struct datapath *get_dp(int dp_idx);
162 const char *dp_name(const struct datapath *dp);
164 #if defined(CONFIG_XEN) && defined(HAVE_PROTO_DATA_VALID)
165 int vswitch_skb_checksum_setup(struct sk_buff *skb);
167 static inline int vswitch_skb_checksum_setup(struct sk_buff *skb)
173 void compute_ip_summed(struct sk_buff *skb, bool xmit);
174 void forward_ip_summed(struct sk_buff *skb);
176 #endif /* datapath.h */