xref: /openbmc/linux/net/openvswitch/flow_table.h (revision f981fc3d)
1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * Copyright (c) 2007-2013 Nicira, Inc.
4  */
5 
6 #ifndef FLOW_TABLE_H
7 #define FLOW_TABLE_H 1
8 
9 #include <linux/kernel.h>
10 #include <linux/netlink.h>
11 #include <linux/openvswitch.h>
12 #include <linux/spinlock.h>
13 #include <linux/types.h>
14 #include <linux/rcupdate.h>
15 #include <linux/if_ether.h>
16 #include <linux/in6.h>
17 #include <linux/jiffies.h>
18 #include <linux/time.h>
19 
20 #include <net/inet_ecn.h>
21 #include <net/ip_tunnels.h>
22 
23 #include "flow.h"
24 
25 struct mask_cache_entry {
26 	u32 skb_hash;
27 	u32 mask_index;
28 };
29 
30 struct mask_cache {
31 	struct rcu_head rcu;
32 	u32 cache_size;  /* Must be ^2 value. */
33 	struct mask_cache_entry __percpu *mask_cache;
34 };
35 
36 struct mask_count {
37 	int index;
38 	u64 counter;
39 };
40 
41 struct mask_array_stats {
42 	struct u64_stats_sync syncp;
43 	u64 usage_cntrs[];
44 };
45 
46 struct mask_array {
47 	struct rcu_head rcu;
48 	int count, max;
49 	struct mask_array_stats __percpu *masks_usage_stats;
50 	u64 *masks_usage_zero_cntr;
51 	struct sw_flow_mask __rcu *masks[];
52 };
53 
54 struct table_instance {
55 	struct hlist_head *buckets;
56 	unsigned int n_buckets;
57 	struct rcu_head rcu;
58 	int node_ver;
59 	u32 hash_seed;
60 };
61 
62 struct flow_table {
63 	struct table_instance __rcu *ti;
64 	struct table_instance __rcu *ufid_ti;
65 	struct mask_cache __rcu *mask_cache;
66 	struct mask_array __rcu *mask_array;
67 	unsigned long last_rehash;
68 	unsigned int count;
69 	unsigned int ufid_count;
70 };
71 
72 extern struct kmem_cache *flow_stats_cache;
73 
74 int ovs_flow_init(void);
75 void ovs_flow_exit(void);
76 
77 struct sw_flow *ovs_flow_alloc(void);
78 void ovs_flow_free(struct sw_flow *, bool deferred);
79 
80 int ovs_flow_tbl_init(struct flow_table *);
81 int ovs_flow_tbl_count(const struct flow_table *table);
82 void ovs_flow_tbl_destroy(struct flow_table *table);
83 int ovs_flow_tbl_flush(struct flow_table *flow_table);
84 
85 int ovs_flow_tbl_insert(struct flow_table *table, struct sw_flow *flow,
86 			const struct sw_flow_mask *mask);
87 void ovs_flow_tbl_remove(struct flow_table *table, struct sw_flow *flow);
88 int  ovs_flow_tbl_num_masks(const struct flow_table *table);
89 u32  ovs_flow_tbl_masks_cache_size(const struct flow_table *table);
90 int  ovs_flow_tbl_masks_cache_resize(struct flow_table *table, u32 size);
91 struct sw_flow *ovs_flow_tbl_dump_next(struct table_instance *table,
92 				       u32 *bucket, u32 *idx);
93 struct sw_flow *ovs_flow_tbl_lookup_stats(struct flow_table *,
94 					  const struct sw_flow_key *,
95 					  u32 skb_hash,
96 					  u32 *n_mask_hit,
97 					  u32 *n_cache_hit);
98 struct sw_flow *ovs_flow_tbl_lookup(struct flow_table *,
99 				    const struct sw_flow_key *);
100 struct sw_flow *ovs_flow_tbl_lookup_exact(struct flow_table *tbl,
101 					  const struct sw_flow_match *match);
102 struct sw_flow *ovs_flow_tbl_lookup_ufid(struct flow_table *,
103 					 const struct sw_flow_id *);
104 
105 bool ovs_flow_cmp(const struct sw_flow *, const struct sw_flow_match *);
106 
107 void ovs_flow_mask_key(struct sw_flow_key *dst, const struct sw_flow_key *src,
108 		       bool full, const struct sw_flow_mask *mask);
109 
110 void ovs_flow_masks_rebalance(struct flow_table *table);
111 void table_instance_flow_flush(struct flow_table *table,
112 			       struct table_instance *ti,
113 			       struct table_instance *ufid_ti);
114 
115 #endif /* flow_table.h */
116