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1 | /* |
2 | * Copyright (c) 2009 Nicira Networks. | |
3 | * | |
4 | * Licensed under the Apache License, Version 2.0 (the "License"); | |
5 | * you may not use this file except in compliance with the License. | |
6 | * You may obtain a copy of the License at: | |
7 | * | |
8 | * http://www.apache.org/licenses/LICENSE-2.0 | |
9 | * | |
10 | * Unless required by applicable law or agreed to in writing, software | |
11 | * distributed under the License is distributed on an "AS IS" BASIS, | |
12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
13 | * See the License for the specific language governing permissions and | |
14 | * limitations under the License. | |
15 | */ | |
16 | ||
17 | #ifndef DPIF_PROVIDER_H | |
18 | #define DPIF_PROVIDER_H 1 | |
19 | ||
20 | /* Provider interface to dpifs, which provide an interface to an Open vSwitch | |
21 | * datapath. */ | |
22 | ||
23 | #include <assert.h> | |
24 | #include "dpif.h" | |
25 | ||
26 | /* Open vSwitch datapath interface. | |
27 | * | |
28 | * This structure should be treated as opaque by dpif implementations. */ | |
29 | struct dpif { | |
30 | const struct dpif_class *class; | |
31 | char *name; | |
32 | uint8_t netflow_engine_type; | |
33 | uint8_t netflow_engine_id; | |
34 | }; | |
35 | ||
36 | void dpif_init(struct dpif *, const struct dpif_class *, const char *name, | |
37 | uint8_t netflow_engine_type, uint8_t netflow_engine_id); | |
38 | static inline void dpif_assert_class(const struct dpif *dpif, | |
39 | const struct dpif_class *class) | |
40 | { | |
41 | assert(dpif->class == class); | |
42 | } | |
43 | ||
44 | /* Datapath interface class structure, to be defined by each implementation of | |
f20279af | 45 | * a datapath interface. |
96fba48f BP |
46 | * |
47 | * These functions return 0 if successful or a positive errno value on failure, | |
48 | * except where otherwise noted. | |
49 | * | |
50 | * These functions are expected to execute synchronously, that is, to block as | |
51 | * necessary to obtain a result. Thus, they may not return EAGAIN or | |
52 | * EWOULDBLOCK or EINPROGRESS. We may relax this requirement in the future if | |
53 | * and when we encounter performance problems. */ | |
54 | struct dpif_class { | |
f20279af | 55 | /* Prefix for names of dpifs in this class, e.g. "netdev:". |
96fba48f BP |
56 | * |
57 | * One dpif class may have the empty string "" as its prefix, in which case | |
58 | * that dpif class is associated with dpif names that don't match any other | |
59 | * class name. */ | |
60 | const char *prefix; | |
61 | ||
62 | /* Class name, for use in error messages. */ | |
63 | const char *name; | |
64 | ||
5792c5c6 BP |
65 | /* Performs periodic work needed by dpifs of this class, if any is |
66 | * necessary. */ | |
67 | void (*run)(void); | |
68 | ||
69 | /* Arranges for poll_block() to wake up if the "run" member function needs | |
70 | * to be called. */ | |
71 | void (*wait)(void); | |
72 | ||
d3d22744 BP |
73 | /* Enumerates the names of all known created datapaths, if possible, into |
74 | * 'all_dps'. The caller has already initialized 'all_dps' and other dpif | |
75 | * classes might already have added names to it. | |
76 | * | |
77 | * This is used by the vswitch at startup, so that it can delete any | |
78 | * datapaths that are not configured. | |
79 | * | |
80 | * Some kinds of datapaths might not be practically enumerable, in which | |
81 | * case this function may be a null pointer. */ | |
82 | int (*enumerate)(struct svec *all_dps); | |
83 | ||
96fba48f BP |
84 | /* Attempts to open an existing dpif, if 'create' is false, or to open an |
85 | * existing dpif or create a new one, if 'create' is true. 'name' is the | |
86 | * full dpif name provided by the user, e.g. "udatapath:/var/run/mypath". | |
87 | * This name is useful for error messages but must not be modified. | |
88 | * | |
89 | * 'suffix' is a copy of 'name' following the dpif's 'prefix'. | |
90 | * | |
91 | * If successful, stores a pointer to the new dpif in '*dpifp'. On failure | |
92 | * there are no requirements on what is stored in '*dpifp'. */ | |
93 | int (*open)(const char *name, char *suffix, bool create, | |
94 | struct dpif **dpifp); | |
95 | ||
96 | /* Closes 'dpif' and frees associated memory. */ | |
97 | void (*close)(struct dpif *dpif); | |
98 | ||
d3d22744 BP |
99 | /* Enumerates all names that may be used to open 'dpif' into 'all_names'. |
100 | * The Linux datapath, for example, supports opening a datapath both by | |
101 | * number, e.g. "dp0", and by the name of the datapath's local port. For | |
102 | * some datapaths, this might be an infinite set (e.g. in a file name, | |
103 | * slashes may be duplicated any number of times), in which case only the | |
104 | * names most likely to be used should be enumerated. | |
105 | * | |
106 | * The caller has already initialized 'all_names' and might already have | |
107 | * added some names to it. This function should not disturb any existing | |
108 | * names in 'all_names'. | |
109 | * | |
110 | * If a datapath class does not support multiple names for a datapath, this | |
111 | * function may be a null pointer. | |
112 | * | |
113 | * This is used by the vswitch at startup, */ | |
114 | int (*get_all_names)(const struct dpif *dpif, struct svec *all_names); | |
115 | ||
96fba48f BP |
116 | /* Attempts to destroy the dpif underlying 'dpif'. |
117 | * | |
118 | * If successful, 'dpif' will not be used again except as an argument for | |
119 | * the 'close' member function. */ | |
120 | int (*delete)(struct dpif *dpif); | |
121 | ||
122 | /* Retrieves statistics for 'dpif' into 'stats'. */ | |
123 | int (*get_stats)(const struct dpif *dpif, struct odp_stats *stats); | |
124 | ||
125 | /* Retrieves 'dpif''s current treatment of IP fragments into '*drop_frags': | |
126 | * true indicates that fragments are dropped, false indicates that | |
127 | * fragments are treated in the same way as other IP packets (except that | |
128 | * the L4 header cannot be read). */ | |
129 | int (*get_drop_frags)(const struct dpif *dpif, bool *drop_frags); | |
130 | ||
131 | /* Changes 'dpif''s treatment of IP fragments to 'drop_frags', whose | |
132 | * meaning is the same as for the get_drop_frags member function. */ | |
133 | int (*set_drop_frags)(struct dpif *dpif, bool drop_frags); | |
134 | ||
135 | /* Creates a new port in 'dpif' connected to network device 'devname'. | |
136 | * 'flags' is a set of ODP_PORT_* flags. If successful, sets '*port_no' | |
137 | * to the new port's port number. */ | |
138 | int (*port_add)(struct dpif *dpif, const char *devname, uint16_t flags, | |
139 | uint16_t *port_no); | |
140 | ||
141 | /* Removes port numbered 'port_no' from 'dpif'. */ | |
142 | int (*port_del)(struct dpif *dpif, uint16_t port_no); | |
143 | ||
144 | /* Queries 'dpif' for a port with the given 'port_no' or 'devname'. Stores | |
145 | * information about the port into '*port' if successful. */ | |
146 | int (*port_query_by_number)(const struct dpif *dpif, uint16_t port_no, | |
147 | struct odp_port *port); | |
148 | int (*port_query_by_name)(const struct dpif *dpif, const char *devname, | |
149 | struct odp_port *port); | |
150 | ||
151 | /* Stores in 'ports' information about up to 'n' ports attached to 'dpif', | |
152 | * in no particular order. Returns the number of ports attached to 'dpif' | |
153 | * (not the number stored), if successful, otherwise a negative errno | |
154 | * value. */ | |
155 | int (*port_list)(const struct dpif *dpif, struct odp_port *ports, int n); | |
156 | ||
e9e28be3 BP |
157 | /* Polls for changes in the set of ports in 'dpif'. If the set of ports in |
158 | * 'dpif' has changed, then this function should do one of the | |
159 | * following: | |
160 | * | |
161 | * - Preferably: store the name of the device that was added to or deleted | |
162 | * from 'dpif' in '*devnamep' and return 0. The caller is responsible | |
163 | * for freeing '*devnamep' (with free()) when it no longer needs it. | |
164 | * | |
165 | * - Alternatively: return ENOBUFS, without indicating the device that was | |
166 | * added or deleted. | |
167 | * | |
168 | * Occasional 'false positives', in which the function returns 0 while | |
169 | * indicating a device that was not actually added or deleted or returns | |
170 | * ENOBUFS without any change, are acceptable. | |
171 | * | |
172 | * If the set of ports in 'dpif' has not changed, returns EAGAIN. May also | |
173 | * return other positive errno values to indicate that something has gone | |
174 | * wrong. */ | |
175 | int (*port_poll)(const struct dpif *dpif, char **devnamep); | |
176 | ||
177 | /* Arranges for the poll loop to wake up when 'port_poll' will return a | |
178 | * value other than EAGAIN. */ | |
179 | void (*port_poll_wait)(const struct dpif *dpif); | |
180 | ||
96fba48f BP |
181 | /* Stores in 'ports' the port numbers of up to 'n' ports that belong to |
182 | * 'group' in 'dpif'. Returns the number of ports in 'group' (not the | |
183 | * number stored), if successful, otherwise a negative errno value. */ | |
184 | int (*port_group_get)(const struct dpif *dpif, int group, | |
185 | uint16_t ports[], int n); | |
186 | ||
187 | /* Changes port group 'group' in 'dpif' to consist of the 'n' ports whose | |
188 | * numbers are given in 'ports'. | |
189 | * | |
190 | * Use the get_stats member function to obtain the number of supported port | |
191 | * groups. */ | |
192 | int (*port_group_set)(struct dpif *dpif, int group, | |
193 | const uint16_t ports[], int n); | |
194 | ||
195 | /* For each flow 'flow' in the 'n' flows in 'flows': | |
196 | * | |
197 | * - If a flow matching 'flow->key' exists in 'dpif': | |
198 | * | |
199 | * Stores 0 into 'flow->stats.error' and stores statistics for the flow | |
200 | * into 'flow->stats'. | |
201 | * | |
202 | * If 'flow->n_actions' is zero, then 'flow->actions' is ignored. If | |
203 | * 'flow->n_actions' is nonzero, then 'flow->actions' should point to | |
204 | * an array of the specified number of actions. At most that many of | |
205 | * the flow's actions will be copied into that array. | |
206 | * 'flow->n_actions' will be updated to the number of actions actually | |
207 | * present in the flow, which may be greater than the number stored if | |
208 | * the flow has more actions than space available in the array. | |
209 | * | |
210 | * - Flow-specific errors are indicated by a positive errno value in | |
211 | * 'flow->stats.error'. In particular, ENOENT indicates that no flow | |
212 | * matching 'flow->key' exists in 'dpif'. When an error value is stored, | |
213 | * the contents of 'flow->key' are preserved but other members of 'flow' | |
214 | * should be treated as indeterminate. | |
215 | * | |
216 | * Returns 0 if all 'n' flows in 'flows' were updated (whether they were | |
217 | * individually successful or not is indicated by 'flow->stats.error', | |
218 | * however). Returns a positive errno value if an error that prevented | |
219 | * this update occurred, in which the caller must not depend on any | |
220 | * elements in 'flows' being updated or not updated. | |
221 | */ | |
222 | int (*flow_get)(const struct dpif *dpif, struct odp_flow flows[], int n); | |
223 | ||
224 | /* Adds or modifies a flow in 'dpif' as specified in 'put': | |
225 | * | |
226 | * - If the flow specified in 'put->flow' does not exist in 'dpif', then | |
227 | * behavior depends on whether ODPPF_CREATE is specified in 'put->flags': | |
228 | * if it is, the flow will be added, otherwise the operation will fail | |
229 | * with ENOENT. | |
230 | * | |
231 | * - Otherwise, the flow specified in 'put->flow' does exist in 'dpif'. | |
232 | * Behavior in this case depends on whether ODPPF_MODIFY is specified in | |
233 | * 'put->flags': if it is, the flow's actions will be updated, otherwise | |
234 | * the operation will fail with EEXIST. If the flow's actions are | |
235 | * updated, then its statistics will be zeroed if ODPPF_ZERO_STATS is set | |
236 | * in 'put->flags', left as-is otherwise. | |
237 | */ | |
238 | int (*flow_put)(struct dpif *dpif, struct odp_flow_put *put); | |
239 | ||
240 | /* Deletes a flow matching 'flow->key' from 'dpif' or returns ENOENT if | |
241 | * 'dpif' does not contain such a flow. | |
242 | * | |
243 | * If successful, updates 'flow->stats', 'flow->n_actions', and | |
244 | * 'flow->actions' as described in more detail under the flow_get member | |
245 | * function below. */ | |
246 | int (*flow_del)(struct dpif *dpif, struct odp_flow *flow); | |
247 | ||
248 | /* Deletes all flows from 'dpif' and clears all of its queues of received | |
249 | * packets. */ | |
250 | int (*flow_flush)(struct dpif *dpif); | |
251 | ||
252 | /* Stores up to 'n' flows in 'dpif' into 'flows', updating their statistics | |
253 | * and actions as described under the flow_get member function. If | |
254 | * successful, returns the number of flows actually present in 'dpif', | |
255 | * which might be greater than the number stored (if 'dpif' has more than | |
256 | * 'n' flows). On failure, returns a negative errno value. */ | |
257 | int (*flow_list)(const struct dpif *dpif, struct odp_flow flows[], int n); | |
258 | ||
259 | /* Performs the 'n_actions' actions in 'actions' on the Ethernet frame | |
260 | * specified in 'packet'. | |
261 | * | |
262 | * Pretends that the frame was originally received on the port numbered | |
263 | * 'in_port'. This affects only ODPAT_OUTPUT_GROUP actions, which will not | |
264 | * send a packet out their input port. Specify the number of an unused | |
265 | * port (e.g. UINT16_MAX is currently always unused) to avoid this | |
266 | * behavior. */ | |
267 | int (*execute)(struct dpif *dpif, uint16_t in_port, | |
268 | const union odp_action actions[], int n_actions, | |
269 | const struct ofpbuf *packet); | |
270 | ||
271 | /* Retrieves 'dpif''s "listen mask" into '*listen_mask'. Each ODPL_* bit | |
272 | * set in '*listen_mask' indicates the 'dpif' will receive messages of the | |
273 | * corresponding type when it calls the recv member function. */ | |
274 | int (*recv_get_mask)(const struct dpif *dpif, int *listen_mask); | |
275 | ||
276 | /* Sets 'dpif''s "listen mask" to 'listen_mask'. Each ODPL_* bit set in | |
277 | * 'listen_mask' indicates the 'dpif' will receive messages of the | |
278 | * corresponding type when it calls the recv member function. */ | |
279 | int (*recv_set_mask)(struct dpif *dpif, int listen_mask); | |
280 | ||
72b06300 BP |
281 | /* Retrieves 'dpif''s sFlow sampling probability into '*probability'. |
282 | * Return value is 0 or a positive errno value. EOPNOTSUPP indicates that | |
283 | * the datapath does not support sFlow, as does a null pointer. | |
284 | * | |
285 | * A probability of 0 means sample no packets, UINT32_MAX means sample | |
286 | * every packet, and other values are intermediate probabilities. */ | |
287 | int (*get_sflow_probability)(const struct dpif *dpif, | |
288 | uint32_t *probability); | |
289 | ||
290 | /* Sets 'dpif''s sFlow sampling probability to 'probability'. Return value | |
291 | * is 0 or a positive errno value. EOPNOTSUPP indicates that the datapath | |
292 | * does not support sFlow, as does a null pointer. | |
293 | * | |
294 | * A probability of 0 means sample no packets, UINT32_MAX means sample | |
295 | * every packet, and other values are intermediate probabilities. */ | |
296 | int (*set_sflow_probability)(struct dpif *dpif, uint32_t probability); | |
297 | ||
96fba48f BP |
298 | /* Attempts to receive a message from 'dpif'. If successful, stores the |
299 | * message into '*packetp'. The message, if one is received, must begin | |
300 | * with 'struct odp_msg' as a header. Only messages of the types selected | |
301 | * with the set_listen_mask member function should be received. | |
302 | * | |
303 | * This function must not block. If no message is ready to be received | |
304 | * when it is called, it should return EAGAIN without blocking. */ | |
305 | int (*recv)(struct dpif *dpif, struct ofpbuf **packetp); | |
306 | ||
307 | /* Arranges for the poll loop to wake up when 'dpif' has a message queued | |
308 | * to be received with the recv member function. */ | |
309 | void (*recv_wait)(struct dpif *dpif); | |
310 | }; | |
311 | ||
312 | extern const struct dpif_class dpif_linux_class; | |
72865317 | 313 | extern const struct dpif_class dpif_netdev_class; |
96fba48f BP |
314 | |
315 | #endif /* dpif-provider.h */ |