datapath/flow.h

   1 /*
   2  * Copyright (c) 2009, 2010 Nicira Networks.
   3  * Distributed under the terms of the GNU GPL version 2.
   4  *
   5  * Significant portions of this file may be copied from parts of the Linux
   6  * kernel, by Linus Torvalds and others.
   7  */
   8
   9 #ifndef FLOW_H
  10 #define FLOW_H 1
  11
  12 #include <linux/kernel.h>
  13 #include <linux/spinlock.h>
  14 #include <linux/types.h>
  15 #include <linux/rcupdate.h>
  16 #include <linux/gfp.h>
  17 #include <linux/time.h>
  18
  19 #include "openvswitch/datapath-protocol.h"
  20 #include "table.h"
  21
  22 struct sk_buff;
  23
  24 struct sw_flow_actions {
  25         struct rcu_head rcu;
  26         unsigned int n_actions;
  27         union odp_action actions[];
  28 };
  29
  30 struct sw_flow {
  31         struct rcu_head rcu;
  32         struct tbl_node tbl_node;
  33
  34         struct odp_flow_key key;
  35         struct sw_flow_actions *sf_acts;
  36
  37         struct timespec used;   /* Last used time. */
  38
  39         u8 ip_tos;              /* IP TOS value. */
  40
  41         spinlock_t lock;        /* Lock for values below. */
  42         u64 packet_count;       /* Number of packets matched. */
  43         u64 byte_count;         /* Number of bytes matched. */
  44         u8 tcp_flags;           /* Union of seen TCP flags. */
  45 };
  46
  47 extern struct kmem_cache *flow_cache;
  48
  49 struct sw_flow_actions *flow_actions_alloc(size_t n_actions);
  50 void flow_deferred_free(struct sw_flow *);
  51 void flow_deferred_free_acts(struct sw_flow_actions *);
  52 int flow_extract(struct sk_buff *, u16 in_port, struct odp_flow_key *);
  53 void flow_used(struct sw_flow *, struct sk_buff *);
  54
  55 struct sw_flow *flow_cast(const struct tbl_node *);
  56 u32 flow_hash(const struct odp_flow_key *key);
  57 int flow_cmp(const struct tbl_node *, void *target);
  58 void flow_free_tbl(struct tbl_node *);
  59
  60 int flow_init(void);
  61 void flow_exit(void);
  62
  63 #endif /* flow.h */