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c9422999 | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
ccb1352e | 2 | /* |
971427f3 | 3 | * Copyright (c) 2007-2014 Nicira, Inc. |
ccb1352e JG |
4 | */ |
5 | ||
6 | #ifndef DATAPATH_H | |
7 | #define DATAPATH_H 1 | |
8 | ||
9 | #include <asm/page.h> | |
10 | #include <linux/kernel.h> | |
11 | #include <linux/mutex.h> | |
12 | #include <linux/netdevice.h> | |
13 | #include <linux/skbuff.h> | |
14 | #include <linux/u64_stats_sync.h> | |
1d8fff90 | 15 | #include <net/ip_tunnels.h> |
ccb1352e | 16 | |
7f8a436e | 17 | #include "conntrack.h" |
ccb1352e | 18 | #include "flow.h" |
e6445719 | 19 | #include "flow_table.h" |
cd8a6c33 | 20 | #include "meter.h" |
9602c01e | 21 | #include "vport-internal_dev.h" |
ccb1352e | 22 | |
eac87c41 EC |
23 | #define DP_MAX_PORTS USHRT_MAX |
24 | #define DP_VPORT_HASH_BUCKETS 1024 | |
25 | #define DP_MASKS_REBALANCE_INTERVAL 4000 | |
15eac2a7 | 26 | |
ccb1352e JG |
27 | /** |
28 | * struct dp_stats_percpu - per-cpu packet processing statistics for a given | |
29 | * datapath. | |
30 | * @n_hit: Number of received packets for which a matching flow was found in | |
31 | * the flow table. | |
32 | * @n_miss: Number of received packets that had no matching flow in the flow | |
33 | * table. The sum of @n_hit and @n_miss is the number of packets that have | |
34 | * been received by the datapath. | |
35 | * @n_lost: Number of received packets that had no matching flow in the flow | |
36 | * table that could not be sent to userspace (normally due to an overflow in | |
37 | * one of the datapath's queues). | |
1bd7116f AZ |
38 | * @n_mask_hit: Number of masks looked up for flow match. |
39 | * @n_mask_hit / (@n_hit + @n_missed) will be the average masks looked | |
40 | * up per packet. | |
9d2f627b EC |
41 | * @n_cache_hit: The number of received packets that had their mask found using |
42 | * the mask cache. | |
ccb1352e JG |
43 | */ |
44 | struct dp_stats_percpu { | |
45 | u64 n_hit; | |
46 | u64 n_missed; | |
47 | u64 n_lost; | |
1bd7116f | 48 | u64 n_mask_hit; |
9d2f627b | 49 | u64 n_cache_hit; |
df9d9fdf | 50 | struct u64_stats_sync syncp; |
ccb1352e JG |
51 | }; |
52 | ||
b83d23a2 MG |
53 | /** |
54 | * struct dp_nlsk_pids - array of netlink portids of for a datapath. | |
55 | * This is used when OVS_DP_F_DISPATCH_UPCALL_PER_CPU | |
56 | * is enabled and must be protected by rcu. | |
57 | * @rcu: RCU callback head for deferred destruction. | |
58 | * @n_pids: Size of @pids array. | |
59 | * @pids: Array storing the Netlink socket PIDs indexed by CPU ID for packets | |
60 | * that miss the flow table. | |
61 | */ | |
62 | struct dp_nlsk_pids { | |
63 | struct rcu_head rcu; | |
64 | u32 n_pids; | |
65 | u32 pids[]; | |
66 | }; | |
67 | ||
ccb1352e JG |
68 | /** |
69 | * struct datapath - datapath for flow-based packet switching | |
70 | * @rcu: RCU callback head for deferred destruction. | |
71 | * @list_node: Element in global 'dps' list. | |
b637e498 | 72 | * @table: flow table. |
15eac2a7 | 73 | * @ports: Hash table for ports. %OVSP_LOCAL port always exists. Protected by |
8e4e1713 | 74 | * ovs_mutex and RCU. |
ccb1352e | 75 | * @stats_percpu: Per-CPU datapath statistics. |
46df7b81 | 76 | * @net: Reference to net namespace. |
3a927bc7 PA |
77 | * @max_headroom: the maximum headroom of all vports in this datapath; it will |
78 | * be used by all the internal vports in this dp. | |
b83d23a2 | 79 | * @upcall_portids: RCU protected 'struct dp_nlsk_pids'. |
ccb1352e JG |
80 | * |
81 | * Context: See the comment on locking at the top of datapath.c for additional | |
82 | * locking information. | |
83 | */ | |
84 | struct datapath { | |
85 | struct rcu_head rcu; | |
86 | struct list_head list_node; | |
87 | ||
88 | /* Flow table. */ | |
b637e498 | 89 | struct flow_table table; |
ccb1352e JG |
90 | |
91 | /* Switch ports. */ | |
15eac2a7 | 92 | struct hlist_head *ports; |
ccb1352e JG |
93 | |
94 | /* Stats. */ | |
95 | struct dp_stats_percpu __percpu *stats_percpu; | |
46df7b81 | 96 | |
46df7b81 | 97 | /* Network namespace ref. */ |
0c5c9fb5 | 98 | possible_net_t net; |
43d4be9c TG |
99 | |
100 | u32 user_features; | |
3a927bc7 PA |
101 | |
102 | u32 max_headroom; | |
96fbc13d AZ |
103 | |
104 | /* Switch meters. */ | |
c7c4c44c | 105 | struct dp_meter_table meter_tbl; |
b83d23a2 MG |
106 | |
107 | struct dp_nlsk_pids __rcu *upcall_portids; | |
ccb1352e JG |
108 | }; |
109 | ||
110 | /** | |
111 | * struct ovs_skb_cb - OVS data in skb CB | |
83c8df26 PS |
112 | * @input_vport: The original vport packet came in on. This value is cached |
113 | * when a packet is received by OVS. | |
7f8a436e JS |
114 | * @mru: The maximum received fragement size; 0 if the packet is not |
115 | * fragmented. | |
494bea39 | 116 | * @acts_origlen: The netlink size of the flow actions applied to this skb. |
52427fa0 | 117 | * @cutlen: The number of bytes from the packet end to be removed. |
ccb1352e JG |
118 | */ |
119 | struct ovs_skb_cb { | |
83c8df26 | 120 | struct vport *input_vport; |
7f8a436e | 121 | u16 mru; |
494bea39 | 122 | u16 acts_origlen; |
f2a4d086 | 123 | u32 cutlen; |
ccb1352e JG |
124 | }; |
125 | #define OVS_CB(skb) ((struct ovs_skb_cb *)(skb)->cb) | |
126 | ||
127 | /** | |
128 | * struct dp_upcall - metadata to include with a packet to send to userspace | |
129 | * @cmd: One of %OVS_PACKET_CMD_*. | |
4490108b | 130 | * @userdata: If nonnull, its variable-length value is passed to userspace as |
ccb1352e | 131 | * %OVS_PACKET_ATTR_USERDATA. |
e8eedb85 PS |
132 | * @portid: Netlink portid to which packet should be sent. If @portid is 0 |
133 | * then no packet is sent and the packet is accounted in the datapath's @n_lost | |
ccb1352e | 134 | * counter. |
8f0aad6f | 135 | * @egress_tun_info: If nonnull, becomes %OVS_PACKET_ATTR_EGRESS_TUN_KEY. |
7f8a436e | 136 | * @mru: If not zero, Maximum received IP fragment size. |
ccb1352e JG |
137 | */ |
138 | struct dp_upcall_info { | |
4c222798 | 139 | struct ip_tunnel_info *egress_tun_info; |
ccb1352e | 140 | const struct nlattr *userdata; |
ccea7445 NM |
141 | const struct nlattr *actions; |
142 | int actions_len; | |
15e47304 | 143 | u32 portid; |
e8eedb85 | 144 | u8 cmd; |
7f8a436e | 145 | u16 mru; |
ccb1352e JG |
146 | }; |
147 | ||
8e4e1713 PS |
148 | /** |
149 | * struct ovs_net - Per net-namespace data for ovs. | |
150 | * @dps: List of datapaths to enable dumping them all out. | |
151 | * Protected by genl_mutex. | |
152 | */ | |
153 | struct ovs_net { | |
154 | struct list_head dps; | |
155 | struct work_struct dp_notify_work; | |
a65878d6 | 156 | struct delayed_work masks_rebalance; |
11efd5cb YHW |
157 | #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT) |
158 | struct ovs_ct_limit_info *ct_limit_info; | |
159 | #endif | |
c2ac6673 JS |
160 | |
161 | /* Module reference for configuring conntrack. */ | |
162 | bool xt_label; | |
bd1903b7 TZ |
163 | }; |
164 | ||
165 | /** | |
166 | * enum ovs_pkt_hash_types - hash info to include with a packet | |
167 | * to send to userspace. | |
168 | * @OVS_PACKET_HASH_SW_BIT: indicates hash was computed in software stack. | |
169 | * @OVS_PACKET_HASH_L4_BIT: indicates hash is a canonical 4-tuple hash | |
170 | * over transport ports. | |
171 | */ | |
172 | enum ovs_pkt_hash_types { | |
173 | OVS_PACKET_HASH_SW_BIT = (1ULL << 32), | |
174 | OVS_PACKET_HASH_L4_BIT = (1ULL << 33), | |
8e4e1713 PS |
175 | }; |
176 | ||
c7d03a00 | 177 | extern unsigned int ovs_net_id; |
8e4e1713 PS |
178 | void ovs_lock(void); |
179 | void ovs_unlock(void); | |
180 | ||
181 | #ifdef CONFIG_LOCKDEP | |
182 | int lockdep_ovsl_is_held(void); | |
183 | #else | |
184 | #define lockdep_ovsl_is_held() 1 | |
185 | #endif | |
186 | ||
80019d31 | 187 | #define ASSERT_OVSL() WARN_ON(!lockdep_ovsl_is_held()) |
8e4e1713 PS |
188 | #define ovsl_dereference(p) \ |
189 | rcu_dereference_protected(p, lockdep_ovsl_is_held()) | |
663efa36 JG |
190 | #define rcu_dereference_ovsl(p) \ |
191 | rcu_dereference_check(p, lockdep_ovsl_is_held()) | |
8e4e1713 | 192 | |
12eb18f7 | 193 | static inline struct net *ovs_dp_get_net(const struct datapath *dp) |
46df7b81 PS |
194 | { |
195 | return read_pnet(&dp->net); | |
196 | } | |
197 | ||
198 | static inline void ovs_dp_set_net(struct datapath *dp, struct net *net) | |
199 | { | |
200 | write_pnet(&dp->net, net); | |
201 | } | |
202 | ||
8e4e1713 PS |
203 | struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no); |
204 | ||
205 | static inline struct vport *ovs_vport_rcu(const struct datapath *dp, int port_no) | |
206 | { | |
207 | WARN_ON_ONCE(!rcu_read_lock_held()); | |
208 | return ovs_lookup_vport(dp, port_no); | |
209 | } | |
210 | ||
211 | static inline struct vport *ovs_vport_ovsl_rcu(const struct datapath *dp, int port_no) | |
212 | { | |
213 | WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held()); | |
214 | return ovs_lookup_vport(dp, port_no); | |
215 | } | |
216 | ||
217 | static inline struct vport *ovs_vport_ovsl(const struct datapath *dp, int port_no) | |
218 | { | |
219 | ASSERT_OVSL(); | |
220 | return ovs_lookup_vport(dp, port_no); | |
221 | } | |
222 | ||
9602c01e AZ |
223 | /* Must be called with rcu_read_lock. */ |
224 | static inline struct datapath *get_dp_rcu(struct net *net, int dp_ifindex) | |
225 | { | |
226 | struct net_device *dev = dev_get_by_index_rcu(net, dp_ifindex); | |
227 | ||
228 | if (dev) { | |
229 | struct vport *vport = ovs_internal_dev_get_vport(dev); | |
230 | ||
231 | if (vport) | |
232 | return vport->dp; | |
233 | } | |
234 | ||
235 | return NULL; | |
236 | } | |
237 | ||
238 | /* The caller must hold either ovs_mutex or rcu_read_lock to keep the | |
239 | * returned dp pointer valid. | |
240 | */ | |
241 | static inline struct datapath *get_dp(struct net *net, int dp_ifindex) | |
242 | { | |
243 | struct datapath *dp; | |
244 | ||
245 | WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held()); | |
246 | rcu_read_lock(); | |
247 | dp = get_dp_rcu(net, dp_ifindex); | |
248 | rcu_read_unlock(); | |
249 | ||
250 | return dp; | |
251 | } | |
252 | ||
ccb1352e | 253 | extern struct notifier_block ovs_dp_device_notifier; |
68eb5503 | 254 | extern struct genl_family dp_vport_genl_family; |
ccb1352e | 255 | |
8c8b1b83 | 256 | void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key); |
ccb1352e JG |
257 | void ovs_dp_detach_port(struct vport *); |
258 | int ovs_dp_upcall(struct datapath *, struct sk_buff *, | |
f2a4d086 WT |
259 | const struct sw_flow_key *, const struct dp_upcall_info *, |
260 | uint32_t cutlen); | |
ccb1352e | 261 | |
b83d23a2 MG |
262 | u32 ovs_dp_get_upcall_portid(const struct datapath *dp, uint32_t cpu_id); |
263 | ||
971427f3 | 264 | const char *ovs_dp_name(const struct datapath *dp); |
9354d452 JB |
265 | struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, struct net *net, |
266 | u32 portid, u32 seq, u8 cmd); | |
ccb1352e | 267 | |
2ff3e4e4 | 268 | int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb, |
12eb18f7 | 269 | const struct sw_flow_actions *, struct sw_flow_key *); |
971427f3 | 270 | |
8e4e1713 | 271 | void ovs_dp_notify_wq(struct work_struct *work); |
03f0d916 | 272 | |
971427f3 AZ |
273 | int action_fifos_init(void); |
274 | void action_fifos_exit(void); | |
275 | ||
be26b9a8 JS |
276 | /* 'KEY' must not have any bits set outside of the 'MASK' */ |
277 | #define OVS_MASKED(OLD, KEY, MASK) ((KEY) | ((OLD) & ~(MASK))) | |
278 | #define OVS_SET_MASKED(OLD, KEY, MASK) ((OLD) = OVS_MASKED(OLD, KEY, MASK)) | |
279 | ||
05da5898 | 280 | #define OVS_NLERR(logging_allowed, fmt, ...) \ |
1815a883 | 281 | do { \ |
05da5898 JR |
282 | if (logging_allowed && net_ratelimit()) \ |
283 | pr_info("netlink: " fmt "\n", ##__VA_ARGS__); \ | |
1815a883 | 284 | } while (0) |
ccb1352e | 285 | #endif /* datapath.h */ |