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
34 #define DP_MAX_GROUPS 16
37 #define DP_MAX_QUEUE_LEN 100
40 * struct dp_stats_percpu - per-cpu packet processing statistics for a given
42 * @n_frags: Number of IP fragments processed by datapath.
43 * @n_hit: Number of received packets for which a matching flow was found in
45 * @n_miss: Number of received packets that had no matching flow in the flow
46 * table. The sum of @n_hit and @n_miss is the number of packets that have
47 * been received by the datapath.
48 * @n_lost: Number of received packets that had no matching flow in the flow
49 * table that could not be sent to userspace (normally due to an overflow in
50 * one of the datapath's queues).
52 struct dp_stats_percpu {
60 struct dp_port_group {
67 * struct datapath - datapath for flow-based packet switching
68 * @mutex: Mutual exclusion for ioctls.
69 * @dp_idx: Datapath number (index into the dps[] array in datapath.c).
70 * @ifobj: Represents /sys/class/net/<devname>/brif.
71 * @drop_frags: Drop all IP fragments if nonzero.
72 * @queues: %DP_N_QUEUES sets of queued packets for userspace to handle.
73 * @waitqueue: Waitqueue, for waiting for new packets in @queues.
74 * @n_flows: Number of flows currently in flow table.
75 * @table: Current flow table (RCU protected).
76 * @groups: Port groups, used by ODPAT_OUTPUT_GROUP action (RCU protected).
77 * @n_ports: Number of ports currently in @ports.
78 * @ports: Map from port number to &struct dp_port. %ODPP_LOCAL port
79 * always exists, other ports may be %NULL.
80 * @port_list: List of all ports in @ports in arbitrary order.
81 * @stats_percpu: Per-CPU datapath statistics.
82 * @sflow_probability: Number of packets out of UINT_MAX to sample to the
83 * %ODPL_SFLOW queue, e.g. (@sflow_probability/UINT_MAX) is the probability of
84 * sampling a given packet.
94 struct sk_buff_head queues[DP_N_QUEUES];
95 wait_queue_head_t waitqueue;
101 struct dp_port_group *groups[DP_MAX_GROUPS];
104 unsigned int n_ports;
105 struct dp_port *ports[DP_MAX_PORTS];
106 struct list_head port_list;
109 struct dp_stats_percpu *stats_percpu;
112 unsigned int sflow_probability;
116 * struct dp_port - one port within a datapath
117 * @port_no: Index into @dp's @ports array.
118 * @dp: Datapath to which this port belongs.
119 * @vport: The network device attached to this port. The contents depends on
120 * the device and should be accessed only through the vport_* functions.
121 * @kobj: Represents /sys/class/net/<devname>/brport.
122 * @linkname: The name of the link from /sys/class/net/<datapath>/brif to this
123 * &struct dp_port. (We keep this around so that we can delete it if the
124 * device gets renamed.) Set to the null string when no link exists.
125 * @node: Element in @dp's @port_list.
126 * @sflow_pool: Number of packets that were candidates for sFlow sampling,
127 * regardless of whether they were actually chosen and sent down to userspace.
134 char linkname[IFNAMSIZ];
135 struct list_head node;
141 OVS_CSUM_UNNECESSARY = 1,
142 OVS_CSUM_COMPLETE = 2,
143 OVS_CSUM_PARTIAL = 3,
147 * struct ovs_skb_cb - OVS data in skb CB
148 * @dp_port: The datapath port on which the skb entered the switch.
149 * @ip_summed: Consistently stores L4 checksumming status across different
151 * @tun_id: ID (in network byte order) of the tunnel that encapsulated this
152 * packet. It is 0 if the packet was not received on a tunnel.
155 struct dp_port *dp_port;
156 enum csum_type ip_summed;
159 #define OVS_CB(skb) ((struct ovs_skb_cb *)(skb)->cb)
161 extern struct notifier_block dp_device_notifier;
162 extern int (*dp_ioctl_hook)(struct net_device *dev, struct ifreq *rq, int cmd);
164 void dp_process_received_packet(struct dp_port *, struct sk_buff *);
165 int dp_detach_port(struct dp_port *, int may_delete);
166 int dp_output_control(struct datapath *, struct sk_buff *, int, u32 arg);
167 int dp_min_mtu(const struct datapath *dp);
168 void set_internal_devs_mtu(const struct datapath *dp);
170 struct datapath *get_dp(int dp_idx);
171 const char *dp_name(const struct datapath *dp);
173 #if defined(CONFIG_XEN) && defined(HAVE_PROTO_DATA_VALID)
174 int vswitch_skb_checksum_setup(struct sk_buff *skb);
176 static inline int vswitch_skb_checksum_setup(struct sk_buff *skb)
182 void compute_ip_summed(struct sk_buff *skb, bool xmit);
183 void forward_ip_summed(struct sk_buff *skb);
185 #endif /* datapath.h */