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ccb1352e | 1 | /* |
971427f3 | 2 | * Copyright (c) 2007-2014 Nicira, Inc. |
ccb1352e JG |
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 DATAPATH_H | |
20 | #define DATAPATH_H 1 | |
21 | ||
22 | #include <asm/page.h> | |
23 | #include <linux/kernel.h> | |
24 | #include <linux/mutex.h> | |
25 | #include <linux/netdevice.h> | |
26 | #include <linux/skbuff.h> | |
27 | #include <linux/u64_stats_sync.h> | |
1d8fff90 | 28 | #include <net/ip_tunnels.h> |
ccb1352e | 29 | |
7f8a436e | 30 | #include "conntrack.h" |
ccb1352e | 31 | #include "flow.h" |
e6445719 | 32 | #include "flow_table.h" |
ccb1352e | 33 | |
15eac2a7 PS |
34 | #define DP_MAX_PORTS USHRT_MAX |
35 | #define DP_VPORT_HASH_BUCKETS 1024 | |
36 | ||
ccb1352e JG |
37 | /** |
38 | * struct dp_stats_percpu - per-cpu packet processing statistics for a given | |
39 | * datapath. | |
40 | * @n_hit: Number of received packets for which a matching flow was found in | |
41 | * the flow table. | |
42 | * @n_miss: Number of received packets that had no matching flow in the flow | |
43 | * table. The sum of @n_hit and @n_miss is the number of packets that have | |
44 | * been received by the datapath. | |
45 | * @n_lost: Number of received packets that had no matching flow in the flow | |
46 | * table that could not be sent to userspace (normally due to an overflow in | |
47 | * one of the datapath's queues). | |
1bd7116f AZ |
48 | * @n_mask_hit: Number of masks looked up for flow match. |
49 | * @n_mask_hit / (@n_hit + @n_missed) will be the average masks looked | |
50 | * up per packet. | |
ccb1352e JG |
51 | */ |
52 | struct dp_stats_percpu { | |
53 | u64 n_hit; | |
54 | u64 n_missed; | |
55 | u64 n_lost; | |
1bd7116f | 56 | u64 n_mask_hit; |
df9d9fdf | 57 | struct u64_stats_sync syncp; |
ccb1352e JG |
58 | }; |
59 | ||
60 | /** | |
61 | * struct datapath - datapath for flow-based packet switching | |
62 | * @rcu: RCU callback head for deferred destruction. | |
63 | * @list_node: Element in global 'dps' list. | |
b637e498 | 64 | * @table: flow table. |
15eac2a7 | 65 | * @ports: Hash table for ports. %OVSP_LOCAL port always exists. Protected by |
8e4e1713 | 66 | * ovs_mutex and RCU. |
ccb1352e | 67 | * @stats_percpu: Per-CPU datapath statistics. |
46df7b81 | 68 | * @net: Reference to net namespace. |
3a927bc7 PA |
69 | * @max_headroom: the maximum headroom of all vports in this datapath; it will |
70 | * be used by all the internal vports in this dp. | |
ccb1352e JG |
71 | * |
72 | * Context: See the comment on locking at the top of datapath.c for additional | |
73 | * locking information. | |
74 | */ | |
75 | struct datapath { | |
76 | struct rcu_head rcu; | |
77 | struct list_head list_node; | |
78 | ||
79 | /* Flow table. */ | |
b637e498 | 80 | struct flow_table table; |
ccb1352e JG |
81 | |
82 | /* Switch ports. */ | |
15eac2a7 | 83 | struct hlist_head *ports; |
ccb1352e JG |
84 | |
85 | /* Stats. */ | |
86 | struct dp_stats_percpu __percpu *stats_percpu; | |
46df7b81 | 87 | |
46df7b81 | 88 | /* Network namespace ref. */ |
0c5c9fb5 | 89 | possible_net_t net; |
43d4be9c TG |
90 | |
91 | u32 user_features; | |
3a927bc7 PA |
92 | |
93 | u32 max_headroom; | |
ccb1352e JG |
94 | }; |
95 | ||
96 | /** | |
97 | * struct ovs_skb_cb - OVS data in skb CB | |
83c8df26 PS |
98 | * @input_vport: The original vport packet came in on. This value is cached |
99 | * when a packet is received by OVS. | |
7f8a436e JS |
100 | * @mru: The maximum received fragement size; 0 if the packet is not |
101 | * fragmented. | |
52427fa0 | 102 | * @cutlen: The number of bytes from the packet end to be removed. |
ccb1352e JG |
103 | */ |
104 | struct ovs_skb_cb { | |
83c8df26 | 105 | struct vport *input_vport; |
7f8a436e | 106 | u16 mru; |
f2a4d086 | 107 | u32 cutlen; |
ccb1352e JG |
108 | }; |
109 | #define OVS_CB(skb) ((struct ovs_skb_cb *)(skb)->cb) | |
110 | ||
111 | /** | |
112 | * struct dp_upcall - metadata to include with a packet to send to userspace | |
113 | * @cmd: One of %OVS_PACKET_CMD_*. | |
4490108b | 114 | * @userdata: If nonnull, its variable-length value is passed to userspace as |
ccb1352e | 115 | * %OVS_PACKET_ATTR_USERDATA. |
e8eedb85 PS |
116 | * @portid: Netlink portid to which packet should be sent. If @portid is 0 |
117 | * then no packet is sent and the packet is accounted in the datapath's @n_lost | |
ccb1352e | 118 | * counter. |
8f0aad6f | 119 | * @egress_tun_info: If nonnull, becomes %OVS_PACKET_ATTR_EGRESS_TUN_KEY. |
7f8a436e | 120 | * @mru: If not zero, Maximum received IP fragment size. |
ccb1352e JG |
121 | */ |
122 | struct dp_upcall_info { | |
4c222798 | 123 | struct ip_tunnel_info *egress_tun_info; |
ccb1352e | 124 | const struct nlattr *userdata; |
ccea7445 NM |
125 | const struct nlattr *actions; |
126 | int actions_len; | |
15e47304 | 127 | u32 portid; |
e8eedb85 | 128 | u8 cmd; |
7f8a436e | 129 | u16 mru; |
ccb1352e JG |
130 | }; |
131 | ||
8e4e1713 PS |
132 | /** |
133 | * struct ovs_net - Per net-namespace data for ovs. | |
134 | * @dps: List of datapaths to enable dumping them all out. | |
135 | * Protected by genl_mutex. | |
136 | */ | |
137 | struct ovs_net { | |
138 | struct list_head dps; | |
139 | struct work_struct dp_notify_work; | |
c2ac6673 JS |
140 | |
141 | /* Module reference for configuring conntrack. */ | |
142 | bool xt_label; | |
8e4e1713 PS |
143 | }; |
144 | ||
c7d03a00 | 145 | extern unsigned int ovs_net_id; |
8e4e1713 PS |
146 | void ovs_lock(void); |
147 | void ovs_unlock(void); | |
148 | ||
149 | #ifdef CONFIG_LOCKDEP | |
150 | int lockdep_ovsl_is_held(void); | |
151 | #else | |
152 | #define lockdep_ovsl_is_held() 1 | |
153 | #endif | |
154 | ||
80019d31 | 155 | #define ASSERT_OVSL() WARN_ON(!lockdep_ovsl_is_held()) |
8e4e1713 PS |
156 | #define ovsl_dereference(p) \ |
157 | rcu_dereference_protected(p, lockdep_ovsl_is_held()) | |
663efa36 JG |
158 | #define rcu_dereference_ovsl(p) \ |
159 | rcu_dereference_check(p, lockdep_ovsl_is_held()) | |
8e4e1713 | 160 | |
12eb18f7 | 161 | static inline struct net *ovs_dp_get_net(const struct datapath *dp) |
46df7b81 PS |
162 | { |
163 | return read_pnet(&dp->net); | |
164 | } | |
165 | ||
166 | static inline void ovs_dp_set_net(struct datapath *dp, struct net *net) | |
167 | { | |
168 | write_pnet(&dp->net, net); | |
169 | } | |
170 | ||
8e4e1713 PS |
171 | struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no); |
172 | ||
173 | static inline struct vport *ovs_vport_rcu(const struct datapath *dp, int port_no) | |
174 | { | |
175 | WARN_ON_ONCE(!rcu_read_lock_held()); | |
176 | return ovs_lookup_vport(dp, port_no); | |
177 | } | |
178 | ||
179 | static inline struct vport *ovs_vport_ovsl_rcu(const struct datapath *dp, int port_no) | |
180 | { | |
181 | WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held()); | |
182 | return ovs_lookup_vport(dp, port_no); | |
183 | } | |
184 | ||
185 | static inline struct vport *ovs_vport_ovsl(const struct datapath *dp, int port_no) | |
186 | { | |
187 | ASSERT_OVSL(); | |
188 | return ovs_lookup_vport(dp, port_no); | |
189 | } | |
190 | ||
ccb1352e | 191 | extern struct notifier_block ovs_dp_device_notifier; |
68eb5503 | 192 | extern struct genl_family dp_vport_genl_family; |
ccb1352e | 193 | |
8c8b1b83 | 194 | void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key); |
ccb1352e JG |
195 | void ovs_dp_detach_port(struct vport *); |
196 | int ovs_dp_upcall(struct datapath *, struct sk_buff *, | |
f2a4d086 WT |
197 | const struct sw_flow_key *, const struct dp_upcall_info *, |
198 | uint32_t cutlen); | |
ccb1352e | 199 | |
971427f3 | 200 | const char *ovs_dp_name(const struct datapath *dp); |
ccb1352e JG |
201 | struct sk_buff *ovs_vport_cmd_build_info(struct vport *, u32 pid, u32 seq, |
202 | u8 cmd); | |
203 | ||
2ff3e4e4 | 204 | int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb, |
12eb18f7 | 205 | const struct sw_flow_actions *, struct sw_flow_key *); |
971427f3 | 206 | |
8e4e1713 | 207 | void ovs_dp_notify_wq(struct work_struct *work); |
03f0d916 | 208 | |
971427f3 AZ |
209 | int action_fifos_init(void); |
210 | void action_fifos_exit(void); | |
211 | ||
be26b9a8 JS |
212 | /* 'KEY' must not have any bits set outside of the 'MASK' */ |
213 | #define OVS_MASKED(OLD, KEY, MASK) ((KEY) | ((OLD) & ~(MASK))) | |
214 | #define OVS_SET_MASKED(OLD, KEY, MASK) ((OLD) = OVS_MASKED(OLD, KEY, MASK)) | |
215 | ||
05da5898 | 216 | #define OVS_NLERR(logging_allowed, fmt, ...) \ |
1815a883 | 217 | do { \ |
05da5898 JR |
218 | if (logging_allowed && net_ratelimit()) \ |
219 | pr_info("netlink: " fmt "\n", ##__VA_ARGS__); \ | |
1815a883 | 220 | } while (0) |
ccb1352e | 221 | #endif /* datapath.h */ |