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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" |
9602c01e | 33 | #include "vport-internal_dev.h" |
ccb1352e | 34 | |
15eac2a7 PS |
35 | #define DP_MAX_PORTS USHRT_MAX |
36 | #define DP_VPORT_HASH_BUCKETS 1024 | |
37 | ||
ccb1352e JG |
38 | /** |
39 | * struct dp_stats_percpu - per-cpu packet processing statistics for a given | |
40 | * datapath. | |
41 | * @n_hit: Number of received packets for which a matching flow was found in | |
42 | * the flow table. | |
43 | * @n_miss: Number of received packets that had no matching flow in the flow | |
44 | * table. The sum of @n_hit and @n_miss is the number of packets that have | |
45 | * been received by the datapath. | |
46 | * @n_lost: Number of received packets that had no matching flow in the flow | |
47 | * table that could not be sent to userspace (normally due to an overflow in | |
48 | * one of the datapath's queues). | |
1bd7116f AZ |
49 | * @n_mask_hit: Number of masks looked up for flow match. |
50 | * @n_mask_hit / (@n_hit + @n_missed) will be the average masks looked | |
51 | * up per packet. | |
ccb1352e JG |
52 | */ |
53 | struct dp_stats_percpu { | |
54 | u64 n_hit; | |
55 | u64 n_missed; | |
56 | u64 n_lost; | |
1bd7116f | 57 | u64 n_mask_hit; |
df9d9fdf | 58 | struct u64_stats_sync syncp; |
ccb1352e JG |
59 | }; |
60 | ||
61 | /** | |
62 | * struct datapath - datapath for flow-based packet switching | |
63 | * @rcu: RCU callback head for deferred destruction. | |
64 | * @list_node: Element in global 'dps' list. | |
b637e498 | 65 | * @table: flow table. |
15eac2a7 | 66 | * @ports: Hash table for ports. %OVSP_LOCAL port always exists. Protected by |
8e4e1713 | 67 | * ovs_mutex and RCU. |
ccb1352e | 68 | * @stats_percpu: Per-CPU datapath statistics. |
46df7b81 | 69 | * @net: Reference to net namespace. |
3a927bc7 PA |
70 | * @max_headroom: the maximum headroom of all vports in this datapath; it will |
71 | * be used by all the internal vports in this dp. | |
ccb1352e JG |
72 | * |
73 | * Context: See the comment on locking at the top of datapath.c for additional | |
74 | * locking information. | |
75 | */ | |
76 | struct datapath { | |
77 | struct rcu_head rcu; | |
78 | struct list_head list_node; | |
79 | ||
80 | /* Flow table. */ | |
b637e498 | 81 | struct flow_table table; |
ccb1352e JG |
82 | |
83 | /* Switch ports. */ | |
15eac2a7 | 84 | struct hlist_head *ports; |
ccb1352e JG |
85 | |
86 | /* Stats. */ | |
87 | struct dp_stats_percpu __percpu *stats_percpu; | |
46df7b81 | 88 | |
46df7b81 | 89 | /* Network namespace ref. */ |
0c5c9fb5 | 90 | possible_net_t net; |
43d4be9c TG |
91 | |
92 | u32 user_features; | |
3a927bc7 PA |
93 | |
94 | u32 max_headroom; | |
96fbc13d AZ |
95 | |
96 | /* Switch meters. */ | |
97 | struct hlist_head *meters; | |
ccb1352e JG |
98 | }; |
99 | ||
100 | /** | |
101 | * struct ovs_skb_cb - OVS data in skb CB | |
83c8df26 PS |
102 | * @input_vport: The original vport packet came in on. This value is cached |
103 | * when a packet is received by OVS. | |
7f8a436e JS |
104 | * @mru: The maximum received fragement size; 0 if the packet is not |
105 | * fragmented. | |
494bea39 | 106 | * @acts_origlen: The netlink size of the flow actions applied to this skb. |
52427fa0 | 107 | * @cutlen: The number of bytes from the packet end to be removed. |
ccb1352e JG |
108 | */ |
109 | struct ovs_skb_cb { | |
83c8df26 | 110 | struct vport *input_vport; |
7f8a436e | 111 | u16 mru; |
494bea39 | 112 | u16 acts_origlen; |
f2a4d086 | 113 | u32 cutlen; |
ccb1352e JG |
114 | }; |
115 | #define OVS_CB(skb) ((struct ovs_skb_cb *)(skb)->cb) | |
116 | ||
117 | /** | |
118 | * struct dp_upcall - metadata to include with a packet to send to userspace | |
119 | * @cmd: One of %OVS_PACKET_CMD_*. | |
4490108b | 120 | * @userdata: If nonnull, its variable-length value is passed to userspace as |
ccb1352e | 121 | * %OVS_PACKET_ATTR_USERDATA. |
e8eedb85 PS |
122 | * @portid: Netlink portid to which packet should be sent. If @portid is 0 |
123 | * then no packet is sent and the packet is accounted in the datapath's @n_lost | |
ccb1352e | 124 | * counter. |
8f0aad6f | 125 | * @egress_tun_info: If nonnull, becomes %OVS_PACKET_ATTR_EGRESS_TUN_KEY. |
7f8a436e | 126 | * @mru: If not zero, Maximum received IP fragment size. |
ccb1352e JG |
127 | */ |
128 | struct dp_upcall_info { | |
4c222798 | 129 | struct ip_tunnel_info *egress_tun_info; |
ccb1352e | 130 | const struct nlattr *userdata; |
ccea7445 NM |
131 | const struct nlattr *actions; |
132 | int actions_len; | |
15e47304 | 133 | u32 portid; |
e8eedb85 | 134 | u8 cmd; |
7f8a436e | 135 | u16 mru; |
ccb1352e JG |
136 | }; |
137 | ||
8e4e1713 PS |
138 | /** |
139 | * struct ovs_net - Per net-namespace data for ovs. | |
140 | * @dps: List of datapaths to enable dumping them all out. | |
141 | * Protected by genl_mutex. | |
142 | */ | |
143 | struct ovs_net { | |
144 | struct list_head dps; | |
145 | struct work_struct dp_notify_work; | |
c2ac6673 JS |
146 | |
147 | /* Module reference for configuring conntrack. */ | |
148 | bool xt_label; | |
8e4e1713 PS |
149 | }; |
150 | ||
c7d03a00 | 151 | extern unsigned int ovs_net_id; |
8e4e1713 PS |
152 | void ovs_lock(void); |
153 | void ovs_unlock(void); | |
154 | ||
155 | #ifdef CONFIG_LOCKDEP | |
156 | int lockdep_ovsl_is_held(void); | |
157 | #else | |
158 | #define lockdep_ovsl_is_held() 1 | |
159 | #endif | |
160 | ||
80019d31 | 161 | #define ASSERT_OVSL() WARN_ON(!lockdep_ovsl_is_held()) |
8e4e1713 PS |
162 | #define ovsl_dereference(p) \ |
163 | rcu_dereference_protected(p, lockdep_ovsl_is_held()) | |
663efa36 JG |
164 | #define rcu_dereference_ovsl(p) \ |
165 | rcu_dereference_check(p, lockdep_ovsl_is_held()) | |
8e4e1713 | 166 | |
12eb18f7 | 167 | static inline struct net *ovs_dp_get_net(const struct datapath *dp) |
46df7b81 PS |
168 | { |
169 | return read_pnet(&dp->net); | |
170 | } | |
171 | ||
172 | static inline void ovs_dp_set_net(struct datapath *dp, struct net *net) | |
173 | { | |
174 | write_pnet(&dp->net, net); | |
175 | } | |
176 | ||
8e4e1713 PS |
177 | struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no); |
178 | ||
179 | static inline struct vport *ovs_vport_rcu(const struct datapath *dp, int port_no) | |
180 | { | |
181 | WARN_ON_ONCE(!rcu_read_lock_held()); | |
182 | return ovs_lookup_vport(dp, port_no); | |
183 | } | |
184 | ||
185 | static inline struct vport *ovs_vport_ovsl_rcu(const struct datapath *dp, int port_no) | |
186 | { | |
187 | WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held()); | |
188 | return ovs_lookup_vport(dp, port_no); | |
189 | } | |
190 | ||
191 | static inline struct vport *ovs_vport_ovsl(const struct datapath *dp, int port_no) | |
192 | { | |
193 | ASSERT_OVSL(); | |
194 | return ovs_lookup_vport(dp, port_no); | |
195 | } | |
196 | ||
9602c01e AZ |
197 | /* Must be called with rcu_read_lock. */ |
198 | static inline struct datapath *get_dp_rcu(struct net *net, int dp_ifindex) | |
199 | { | |
200 | struct net_device *dev = dev_get_by_index_rcu(net, dp_ifindex); | |
201 | ||
202 | if (dev) { | |
203 | struct vport *vport = ovs_internal_dev_get_vport(dev); | |
204 | ||
205 | if (vport) | |
206 | return vport->dp; | |
207 | } | |
208 | ||
209 | return NULL; | |
210 | } | |
211 | ||
212 | /* The caller must hold either ovs_mutex or rcu_read_lock to keep the | |
213 | * returned dp pointer valid. | |
214 | */ | |
215 | static inline struct datapath *get_dp(struct net *net, int dp_ifindex) | |
216 | { | |
217 | struct datapath *dp; | |
218 | ||
219 | WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held()); | |
220 | rcu_read_lock(); | |
221 | dp = get_dp_rcu(net, dp_ifindex); | |
222 | rcu_read_unlock(); | |
223 | ||
224 | return dp; | |
225 | } | |
226 | ||
ccb1352e | 227 | extern struct notifier_block ovs_dp_device_notifier; |
68eb5503 | 228 | extern struct genl_family dp_vport_genl_family; |
ccb1352e | 229 | |
8c8b1b83 | 230 | void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key); |
ccb1352e JG |
231 | void ovs_dp_detach_port(struct vport *); |
232 | int ovs_dp_upcall(struct datapath *, struct sk_buff *, | |
f2a4d086 WT |
233 | const struct sw_flow_key *, const struct dp_upcall_info *, |
234 | uint32_t cutlen); | |
ccb1352e | 235 | |
971427f3 | 236 | const char *ovs_dp_name(const struct datapath *dp); |
9354d452 JB |
237 | struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, struct net *net, |
238 | u32 portid, u32 seq, u8 cmd); | |
ccb1352e | 239 | |
2ff3e4e4 | 240 | int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb, |
12eb18f7 | 241 | const struct sw_flow_actions *, struct sw_flow_key *); |
971427f3 | 242 | |
8e4e1713 | 243 | void ovs_dp_notify_wq(struct work_struct *work); |
03f0d916 | 244 | |
971427f3 AZ |
245 | int action_fifos_init(void); |
246 | void action_fifos_exit(void); | |
247 | ||
be26b9a8 JS |
248 | /* 'KEY' must not have any bits set outside of the 'MASK' */ |
249 | #define OVS_MASKED(OLD, KEY, MASK) ((KEY) | ((OLD) & ~(MASK))) | |
250 | #define OVS_SET_MASKED(OLD, KEY, MASK) ((OLD) = OVS_MASKED(OLD, KEY, MASK)) | |
251 | ||
05da5898 | 252 | #define OVS_NLERR(logging_allowed, fmt, ...) \ |
1815a883 | 253 | do { \ |
05da5898 JR |
254 | if (logging_allowed && net_ratelimit()) \ |
255 | pr_info("netlink: " fmt "\n", ##__VA_ARGS__); \ | |
1815a883 | 256 | } while (0) |
ccb1352e | 257 | #endif /* datapath.h */ |