datapath/flow_table.h

   1 /*
   2  * Copyright (c) 2007-2013 Nicira, Inc.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of version 2 of the GNU General Public
   6  * License as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  11  * General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program; if not, write to the Free Software
  15  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  16  * 02110-1301, USA
  17  */
  18
  19 #ifndef FLOW_TABLE_H
  20 #define FLOW_TABLE_H 1
  21
  22 #include <linux/kernel.h>
  23 #include <linux/netlink.h>
  24 #include <linux/openvswitch.h>
  25 #include <linux/spinlock.h>
  26 #include <linux/types.h>
  27 #include <linux/rcupdate.h>
  28 #include <linux/if_ether.h>
  29 #include <linux/in6.h>
  30 #include <linux/jiffies.h>
  31 #include <linux/time.h>
  32 #include <linux/flex_array.h>
  33
  34 #include <net/inet_ecn.h>
  35 #include <net/ip_tunnels.h>
  36
  37 #include "flow.h"
  38
  39 struct mask_cache_entry {
  40         u32 skb_hash;
  41         u32 mask_index;
  42 };
  43
  44 struct table_instance {
  45         struct flex_array *buckets;
  46         unsigned int n_buckets;
  47         struct rcu_head rcu;
  48         int node_ver;
  49         u32 hash_seed;
  50         bool keep_flows;
  51 };
  52
  53 struct flow_table {
  54         struct table_instance __rcu *ti;
  55         struct mask_cache_entry __percpu *mask_cache;
  56         struct list_head mask_list;
  57         unsigned long last_rehash;
  58         unsigned int count;
  59 };
  60
  61 extern struct kmem_cache *flow_stats_cache;
  62
  63 int ovs_flow_init(void);
  64 void ovs_flow_exit(void);
  65
  66 struct sw_flow *ovs_flow_alloc(void);
  67 void ovs_flow_free(struct sw_flow *, bool deferred);
  68
  69 int ovs_flow_tbl_init(struct flow_table *);
  70 int ovs_flow_tbl_count(struct flow_table *table);
  71 void ovs_flow_tbl_destroy(struct flow_table *table);
  72 int ovs_flow_tbl_flush(struct flow_table *flow_table);
  73
  74 int ovs_flow_tbl_insert(struct flow_table *table, struct sw_flow *flow,
  75                         struct sw_flow_mask *mask);
  76 void ovs_flow_tbl_remove(struct flow_table *table, struct sw_flow *flow);
  77 int  ovs_flow_tbl_num_masks(const struct flow_table *table);
  78 struct sw_flow *ovs_flow_tbl_dump_next(struct table_instance *table,
  79                                        u32 *bucket, u32 *idx);
  80 struct sw_flow *ovs_flow_tbl_lookup_stats(struct flow_table *,
  81                                           const struct sw_flow_key *,
  82                                           u32 skb_hash,
  83                                           u32 *n_mask_hit);
  84 struct sw_flow *ovs_flow_tbl_lookup(struct flow_table *,
  85                                     const struct sw_flow_key *);
  86
  87 bool ovs_flow_cmp_unmasked_key(const struct sw_flow *flow,
  88                                struct sw_flow_match *match);
  89
  90 void ovs_flow_mask_key(struct sw_flow_key *dst, const struct sw_flow_key *src,
  91                        const struct sw_flow_mask *mask);
  92 #endif /* flow_table.h */