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
  33 #include <net/inet_ecn.h>
  34 #include <net/ip_tunnels.h>
  35
  36 #include "flow.h"
  37
  38 struct mask_cache_entry {
  39         u32 skb_hash;
  40         u32 mask_index;
  41 };
  42
  43 struct mask_array {
  44         struct rcu_head rcu;
  45         int count, max;
  46         struct sw_flow_mask __rcu *masks[];
  47 };
  48
  49 struct table_instance {
  50         struct hlist_head *buckets;
  51         unsigned int n_buckets;
  52         struct rcu_head rcu;
  53         int node_ver;
  54         u32 hash_seed;
  55         bool keep_flows;
  56 };
  57
  58 struct flow_table {
  59         struct table_instance __rcu *ti;
  60         struct table_instance __rcu *ufid_ti;
  61         struct mask_cache_entry __percpu *mask_cache;
  62         struct mask_array __rcu *mask_array;
  63         unsigned long last_rehash;
  64         unsigned int count;
  65         unsigned int ufid_count;
  66 };
  67
  68 extern struct kmem_cache *flow_stats_cache;
  69
  70 int ovs_flow_init(void);
  71 void ovs_flow_exit(void);
  72
  73 struct sw_flow *ovs_flow_alloc(void);
  74 void ovs_flow_free(struct sw_flow *, bool deferred);
  75
  76 int ovs_flow_tbl_init(struct flow_table *);
  77 int ovs_flow_tbl_count(const struct flow_table *table);
  78 void ovs_flow_tbl_destroy(struct flow_table *table);
  79 int ovs_flow_tbl_flush(struct flow_table *flow_table);
  80
  81 int ovs_flow_tbl_insert(struct flow_table *table, struct sw_flow *flow,
  82                         const struct sw_flow_mask *mask);
  83 void ovs_flow_tbl_remove(struct flow_table *table, struct sw_flow *flow);
  84 int  ovs_flow_tbl_num_masks(const struct flow_table *table);
  85 struct sw_flow *ovs_flow_tbl_dump_next(struct table_instance *table,
  86                                        u32 *bucket, u32 *idx);
  87 struct sw_flow *ovs_flow_tbl_lookup_stats(struct flow_table *,
  88                                           const struct sw_flow_key *,
  89                                           u32 skb_hash,
  90                                           u32 *n_mask_hit);
  91 struct sw_flow *ovs_flow_tbl_lookup(struct flow_table *,
  92                                     const struct sw_flow_key *);
  93 struct sw_flow *ovs_flow_tbl_lookup_exact(struct flow_table *tbl,
  94                                           const struct sw_flow_match *match);
  95 struct sw_flow *ovs_flow_tbl_lookup_ufid(struct flow_table *,
  96                                          const struct sw_flow_id *);
  97
  98 bool ovs_flow_cmp(const struct sw_flow *, const struct sw_flow_match *);
  99
 100 void ovs_flow_mask_key(struct sw_flow_key *dst, const struct sw_flow_key *src,
 101                        bool full, const struct sw_flow_mask *mask);
 102 #endif /* flow_table.h */