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d08a2e92 | 1 | /* |
e0edde6f | 2 | * Copyright (c) 2009, 2010, 2011, 2012 Nicira, Inc. |
d08a2e92 BP |
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 | ||
5bee6e26 JP |
17 | #ifndef OFPROTO_OFPROTO_PROVIDER_H |
18 | #define OFPROTO_OFPROTO_PROVIDER_H 1 | |
d08a2e92 BP |
19 | |
20 | /* Definitions for use within ofproto. */ | |
21 | ||
22 | #include "ofproto/ofproto.h" | |
1de11730 | 23 | #include "cfm.h" |
abe529af | 24 | #include "classifier.h" |
254750ce | 25 | #include "heap.h" |
abe529af | 26 | #include "list.h" |
90bf1e07 | 27 | #include "ofp-errors.h" |
9e1fd49b | 28 | #include "ofp-util.h" |
abe529af | 29 | #include "shash.h" |
e1b1d06a | 30 | #include "simap.h" |
abe529af BP |
31 | #include "timeval.h" |
32 | ||
81a76618 | 33 | struct match; |
f25d0cf3 | 34 | struct ofpact; |
75a75043 BP |
35 | struct ofputil_flow_mod; |
36 | ||
abe529af BP |
37 | /* An OpenFlow switch. |
38 | * | |
39 | * With few exceptions, ofproto implementations may look at these fields but | |
40 | * should not modify them. */ | |
41 | struct ofproto { | |
6e492d81 | 42 | struct hmap_node hmap_node; /* In global 'all_ofprotos' hmap. */ |
abe529af BP |
43 | const struct ofproto_class *ofproto_class; |
44 | char *type; /* Datapath type. */ | |
45 | char *name; /* Datapath name. */ | |
abe529af BP |
46 | |
47 | /* Settings. */ | |
48 | uint64_t fallback_dpid; /* Datapath ID if no better choice found. */ | |
49 | uint64_t datapath_id; /* Datapath ID. */ | |
084f5290 SH |
50 | unsigned flow_eviction_threshold; /* Threshold at which to begin flow |
51 | * table eviction. Only affects the | |
52 | * ofproto-dpif implementation */ | |
8402c74b SS |
53 | bool forward_bpdu; /* Option to allow forwarding of BPDU frames |
54 | * when NORMAL action is invoked. */ | |
abe529af BP |
55 | char *mfr_desc; /* Manufacturer. */ |
56 | char *hw_desc; /* Hardware. */ | |
57 | char *sw_desc; /* Software version. */ | |
58 | char *serial_desc; /* Serial number. */ | |
59 | char *dp_desc; /* Datapath description. */ | |
7257b535 | 60 | enum ofp_config_flags frag_handling; /* One of OFPC_*. */ |
abe529af BP |
61 | |
62 | /* Datapath. */ | |
abe529af BP |
63 | struct hmap ports; /* Contains "struct ofport"s. */ |
64 | struct shash port_by_name; | |
e1b1d06a JP |
65 | unsigned long *ofp_port_ids;/* Bitmap of used OpenFlow port numbers. */ |
66 | struct simap ofp_requests; /* OpenFlow port number requests. */ | |
67 | uint16_t alloc_port_no; /* Last allocated OpenFlow port number. */ | |
91858960 | 68 | uint16_t max_ports; /* Max possible OpenFlow port num, plus one. */ |
abe529af | 69 | |
6c1491fb | 70 | /* Flow tables. */ |
d0918789 | 71 | struct oftable *tables; |
6c1491fb | 72 | int n_tables; |
abe529af BP |
73 | |
74 | /* OpenFlow connections. */ | |
75 | struct connmgr *connmgr; | |
7ee20df1 BP |
76 | |
77 | /* Flow table operation tracking. */ | |
78 | int state; /* Internal state. */ | |
79 | struct list pending; /* List of "struct ofopgroup"s. */ | |
dd5616b3 | 80 | unsigned int n_pending; /* list_size(&pending). */ |
7ee20df1 | 81 | struct hmap deletions; /* All OFOPERATION_DELETE "ofoperation"s. */ |
52a90c29 | 82 | |
a5b8d268 BP |
83 | /* Flow table operation logging. */ |
84 | int n_add, n_delete, n_modify; /* Number of unreported ops of each kind. */ | |
85 | long long int first_op, last_op; /* Range of times for unreported ops. */ | |
86 | long long int next_op_report; /* Time to report ops, or LLONG_MAX. */ | |
87 | long long int op_backoff; /* Earliest time to report ops again. */ | |
88 | ||
52a90c29 BP |
89 | /* Linux VLAN device support (e.g. "eth0.10" for VLAN 10.) |
90 | * | |
91 | * This is deprecated. It is only for compatibility with broken device | |
92 | * drivers in old versions of Linux that do not properly support VLANs when | |
93 | * VLAN devices are not used. When broken device drivers are no longer in | |
94 | * widespread use, we will delete these interfaces. */ | |
95 | unsigned long int *vlan_bitmap; /* 4096-bit bitmap of in-use VLANs. */ | |
96 | bool vlans_changed; /* True if new VLANs are in use. */ | |
ada3428f | 97 | int min_mtu; /* Current MTU of non-internal ports. */ |
abe529af BP |
98 | }; |
99 | ||
0f5f95a9 | 100 | void ofproto_init_tables(struct ofproto *, int n_tables); |
91858960 | 101 | void ofproto_init_max_ports(struct ofproto *, uint16_t max_ports); |
0f5f95a9 | 102 | |
abe529af BP |
103 | struct ofproto *ofproto_lookup(const char *name); |
104 | struct ofport *ofproto_get_port(const struct ofproto *, uint16_t ofp_port); | |
105 | ||
106 | /* An OpenFlow port within a "struct ofproto". | |
107 | * | |
108 | * With few exceptions, ofproto implementations may look at these fields but | |
109 | * should not modify them. */ | |
110 | struct ofport { | |
abe529af | 111 | struct hmap_node hmap_node; /* In struct ofproto's "ports" hmap. */ |
6e492d81 | 112 | struct ofproto *ofproto; /* The ofproto that contains this port. */ |
abe529af | 113 | struct netdev *netdev; |
9e1fd49b | 114 | struct ofputil_phy_port pp; |
abe529af | 115 | uint16_t ofp_port; /* OpenFlow port number. */ |
031d8bff | 116 | unsigned int change_seq; |
9197df76 | 117 | int mtu; |
abe529af BP |
118 | }; |
119 | ||
9e1fd49b | 120 | void ofproto_port_set_state(struct ofport *, enum ofputil_port_state); |
5a2dfd47 | 121 | |
c2f0373a BP |
122 | /* OpenFlow table flags: |
123 | * | |
124 | * - "Hidden" tables are not included in OpenFlow operations that operate on | |
125 | * "all tables". For example, a request for flow stats on all tables will | |
126 | * omit flows in hidden tables, table stats requests will omit the table | |
127 | * entirely, and the switch features reply will not count the hidden table. | |
128 | * | |
129 | * However, operations that specifically name the particular table still | |
130 | * operate on it. For example, flow_mods and flow stats requests on a | |
131 | * hidden table work. | |
132 | * | |
133 | * To avoid gaps in table IDs (which have unclear validity in OpenFlow), | |
134 | * hidden tables must be the highest-numbered tables that a provider | |
135 | * implements. | |
136 | * | |
137 | * - "Read-only" tables can't be changed through OpenFlow operations. (At | |
138 | * the moment all flow table operations go effectively through OpenFlow, so | |
139 | * this means that read-only tables can't be changed at all after the | |
140 | * read-only flag is set.) | |
141 | * | |
142 | * The generic ofproto layer never sets these flags. An ofproto provider can | |
143 | * set them if it is appropriate. | |
144 | */ | |
5c67e4af BP |
145 | enum oftable_flags { |
146 | OFTABLE_HIDDEN = 1 << 0, /* Hide from most OpenFlow operations. */ | |
147 | OFTABLE_READONLY = 1 << 1 /* Don't allow OpenFlow to change this table. */ | |
148 | }; | |
149 | ||
d0918789 BP |
150 | /* A flow table within a "struct ofproto". */ |
151 | struct oftable { | |
5c67e4af | 152 | enum oftable_flags flags; |
d0918789 | 153 | struct classifier cls; /* Contains "struct rule"s. */ |
254750ce BP |
154 | char *name; /* Table name exposed via OpenFlow, or NULL. */ |
155 | ||
156 | /* Maximum number of flows or UINT_MAX if there is no limit besides any | |
157 | * limit imposed by resource limitations. */ | |
158 | unsigned int max_flows; | |
159 | ||
160 | /* These members determine the handling of an attempt to add a flow that | |
161 | * would cause the table to have more than 'max_flows' flows. | |
162 | * | |
163 | * If 'eviction_fields' is NULL, overflows will be rejected with an error. | |
164 | * | |
165 | * If 'eviction_fields' is nonnull (regardless of whether n_eviction_fields | |
166 | * is nonzero), an overflow will cause a flow to be removed. The flow to | |
167 | * be removed is chosen to give fairness among groups distinguished by | |
168 | * different values for the subfields within 'groups'. */ | |
169 | struct mf_subfield *eviction_fields; | |
170 | size_t n_eviction_fields; | |
171 | ||
172 | /* Eviction groups. | |
173 | * | |
174 | * When a flow is added that would cause the table to have more than | |
175 | * 'max_flows' flows, and 'eviction_fields' is nonnull, these groups are | |
176 | * used to decide which rule to evict: the rule is chosen from the eviction | |
177 | * group that contains the greatest number of rules.*/ | |
178 | uint32_t eviction_group_id_basis; | |
179 | struct hmap eviction_groups_by_id; | |
180 | struct heap eviction_groups_by_size; | |
d0918789 BP |
181 | }; |
182 | ||
183 | /* Assigns TABLE to each oftable, in turn, in OFPROTO. | |
184 | * | |
185 | * All parameters are evaluated multiple times. */ | |
186 | #define OFPROTO_FOR_EACH_TABLE(TABLE, OFPROTO) \ | |
187 | for ((TABLE) = (OFPROTO)->tables; \ | |
188 | (TABLE) < &(OFPROTO)->tables[(OFPROTO)->n_tables]; \ | |
189 | (TABLE)++) | |
190 | ||
abe529af BP |
191 | /* An OpenFlow flow within a "struct ofproto". |
192 | * | |
193 | * With few exceptions, ofproto implementations may look at these fields but | |
194 | * should not modify them. */ | |
195 | struct rule { | |
9ed18e46 | 196 | struct list ofproto_node; /* Owned by ofproto base code. */ |
6e492d81 | 197 | struct ofproto *ofproto; /* The ofproto that contains this rule. */ |
abe529af BP |
198 | struct cls_rule cr; /* In owning ofproto's classifier. */ |
199 | ||
7ee20df1 BP |
200 | struct ofoperation *pending; /* Operation now in progress, if nonnull. */ |
201 | ||
abe529af BP |
202 | ovs_be64 flow_cookie; /* Controller-issued identifier. */ |
203 | ||
204 | long long int created; /* Creation time. */ | |
308881af | 205 | long long int modified; /* Time of last modification. */ |
1745cd08 BP |
206 | long long int used; /* Last use; time created if never used. */ |
207 | uint16_t hard_timeout; /* In seconds from ->modified. */ | |
208 | uint16_t idle_timeout; /* In seconds from ->used. */ | |
6c1491fb | 209 | uint8_t table_id; /* Index in ofproto's 'tables' array. */ |
abe529af BP |
210 | bool send_flow_removed; /* Send a flow removed message? */ |
211 | ||
254750ce BP |
212 | /* Eviction groups. */ |
213 | bool evictable; /* If false, prevents eviction. */ | |
214 | struct heap_node evg_node; /* In eviction_group's "rules" heap. */ | |
215 | struct eviction_group *eviction_group; /* NULL if not in any group. */ | |
216 | ||
f25d0cf3 BP |
217 | struct ofpact *ofpacts; /* Sequence of "struct ofpacts". */ |
218 | unsigned int ofpacts_len; /* Size of 'ofpacts', in bytes. */ | |
2b07c8b1 BP |
219 | |
220 | /* Flow monitors. */ | |
221 | enum nx_flow_monitor_flags monitor_flags; | |
222 | uint64_t add_seqno; /* Sequence number when added. */ | |
223 | uint64_t modify_seqno; /* Sequence number when changed. */ | |
abe529af BP |
224 | }; |
225 | ||
226 | static inline struct rule * | |
227 | rule_from_cls_rule(const struct cls_rule *cls_rule) | |
228 | { | |
229 | return cls_rule ? CONTAINER_OF(cls_rule, struct rule, cr) : NULL; | |
230 | } | |
231 | ||
1745cd08 | 232 | void ofproto_rule_update_used(struct rule *, long long int used); |
abe529af BP |
233 | void ofproto_rule_expire(struct rule *, uint8_t reason); |
234 | void ofproto_rule_destroy(struct rule *); | |
235 | ||
2b07c8b1 BP |
236 | bool ofproto_rule_has_out_port(const struct rule *, uint16_t out_port); |
237 | ||
90bf1e07 | 238 | void ofoperation_complete(struct ofoperation *, enum ofperr); |
7ee20df1 BP |
239 | struct rule *ofoperation_get_victim(struct ofoperation *); |
240 | ||
2b07c8b1 BP |
241 | bool ofoperation_has_out_port(const struct ofoperation *, uint16_t out_port); |
242 | ||
243 | bool ofproto_rule_is_hidden(const struct rule *); | |
244 | ||
abe529af BP |
245 | /* ofproto class structure, to be defined by each ofproto implementation. |
246 | * | |
247 | * | |
248 | * Data Structures | |
249 | * =============== | |
250 | * | |
251 | * These functions work primarily with three different kinds of data | |
252 | * structures: | |
253 | * | |
254 | * - "struct ofproto", which represents an OpenFlow switch. | |
255 | * | |
256 | * - "struct ofport", which represents a port within an ofproto. | |
257 | * | |
258 | * - "struct rule", which represents an OpenFlow flow within an ofproto. | |
259 | * | |
260 | * Each of these data structures contains all of the implementation-independent | |
261 | * generic state for the respective concept, called the "base" state. None of | |
262 | * them contains any extra space for ofproto implementations to use. Instead, | |
263 | * each implementation is expected to declare its own data structure that | |
264 | * contains an instance of the generic data structure plus additional | |
265 | * implementation-specific members, called the "derived" state. The | |
266 | * implementation can use casts or (preferably) the CONTAINER_OF macro to | |
267 | * obtain access to derived state given only a pointer to the embedded generic | |
268 | * data structure. | |
269 | * | |
270 | * | |
271 | * Life Cycle | |
272 | * ========== | |
273 | * | |
274 | * Four stylized functions accompany each of these data structures: | |
275 | * | |
276 | * "alloc" "construct" "destruct" "dealloc" | |
277 | * ------------ ---------------- --------------- -------------- | |
278 | * ofproto ->alloc ->construct ->destruct ->dealloc | |
279 | * ofport ->port_alloc ->port_construct ->port_destruct ->port_dealloc | |
280 | * rule ->rule_alloc ->rule_construct ->rule_destruct ->rule_dealloc | |
281 | * | |
282 | * Any instance of a given data structure goes through the following life | |
283 | * cycle: | |
284 | * | |
285 | * 1. The client calls the "alloc" function to obtain raw memory. If "alloc" | |
286 | * fails, skip all the other steps. | |
287 | * | |
288 | * 2. The client initializes all of the data structure's base state. If this | |
289 | * fails, skip to step 7. | |
290 | * | |
291 | * 3. The client calls the "construct" function. The implementation | |
292 | * initializes derived state. It may refer to the already-initialized | |
293 | * base state. If "construct" fails, skip to step 6. | |
294 | * | |
295 | * 4. The data structure is now initialized and in use. | |
296 | * | |
297 | * 5. When the data structure is no longer needed, the client calls the | |
298 | * "destruct" function. The implementation uninitializes derived state. | |
299 | * The base state has not been uninitialized yet, so the implementation | |
300 | * may still refer to it. | |
301 | * | |
302 | * 6. The client uninitializes all of the data structure's base state. | |
303 | * | |
304 | * 7. The client calls the "dealloc" to free the raw memory. The | |
305 | * implementation must not refer to base or derived state in the data | |
306 | * structure, because it has already been uninitialized. | |
307 | * | |
308 | * Each "alloc" function allocates and returns a new instance of the respective | |
309 | * data structure. The "alloc" function is not given any information about the | |
310 | * use of the new data structure, so it cannot perform much initialization. | |
311 | * Its purpose is just to ensure that the new data structure has enough room | |
312 | * for base and derived state. It may return a null pointer if memory is not | |
313 | * available, in which case none of the other functions is called. | |
314 | * | |
315 | * Each "construct" function initializes derived state in its respective data | |
316 | * structure. When "construct" is called, all of the base state has already | |
317 | * been initialized, so the "construct" function may refer to it. The | |
318 | * "construct" function is allowed to fail, in which case the client calls the | |
319 | * "dealloc" function (but not the "destruct" function). | |
320 | * | |
321 | * Each "destruct" function uninitializes and frees derived state in its | |
322 | * respective data structure. When "destruct" is called, the base state has | |
323 | * not yet been uninitialized, so the "destruct" function may refer to it. The | |
324 | * "destruct" function is not allowed to fail. | |
325 | * | |
326 | * Each "dealloc" function frees raw memory that was allocated by the the | |
327 | * "alloc" function. The memory's base and derived members might not have ever | |
328 | * been initialized (but if "construct" returned successfully, then it has been | |
329 | * "destruct"ed already). The "dealloc" function is not allowed to fail. | |
330 | * | |
331 | * | |
332 | * Conventions | |
333 | * =========== | |
334 | * | |
335 | * Most of these functions return 0 if they are successful or a positive error | |
336 | * code on failure. Depending on the function, valid error codes are either | |
90bf1e07 | 337 | * errno values or OFPERR_* OpenFlow error codes. |
abe529af BP |
338 | * |
339 | * Most of these functions are expected to execute synchronously, that is, to | |
340 | * block as necessary to obtain a result. Thus, these functions may return | |
341 | * EAGAIN (or EWOULDBLOCK or EINPROGRESS) only where the function descriptions | |
342 | * explicitly say those errors are a possibility. We may relax this | |
343 | * requirement in the future if and when we encounter performance problems. */ | |
344 | struct ofproto_class { | |
345 | /* ## ----------------- ## */ | |
346 | /* ## Factory Functions ## */ | |
347 | /* ## ----------------- ## */ | |
348 | ||
b0408fca JP |
349 | /* Initializes provider. The caller may pass in 'iface_hints', |
350 | * which contains an shash of "struct iface_hint" elements indexed | |
351 | * by the interface's name. The provider may use these hints to | |
352 | * describe the startup configuration in order to reinitialize its | |
353 | * state. The caller owns the provided data, so a provider must | |
354 | * make copies of anything required. An ofproto provider must | |
355 | * remove any existing state that is not described by the hint, and | |
356 | * may choose to remove it all. */ | |
357 | void (*init)(const struct shash *iface_hints); | |
358 | ||
5bf0e941 BP |
359 | /* Enumerates the types of all support ofproto types into 'types'. The |
360 | * caller has already initialized 'types' and other ofproto classes might | |
361 | * already have added names to it. */ | |
abe529af | 362 | void (*enumerate_types)(struct sset *types); |
5bf0e941 BP |
363 | |
364 | /* Enumerates the names of all existing datapath of the specified 'type' | |
365 | * into 'names' 'all_dps'. The caller has already initialized 'names' as | |
366 | * an empty sset. | |
367 | * | |
368 | * 'type' is one of the types enumerated by ->enumerate_types(). | |
369 | * | |
370 | * Returns 0 if successful, otherwise a positive errno value. | |
371 | */ | |
abe529af | 372 | int (*enumerate_names)(const char *type, struct sset *names); |
5bf0e941 BP |
373 | |
374 | /* Deletes the datapath with the specified 'type' and 'name'. The caller | |
375 | * should have closed any open ofproto with this 'type' and 'name'; this | |
376 | * function is allowed to fail if that is not the case. | |
377 | * | |
378 | * 'type' is one of the types enumerated by ->enumerate_types(). | |
379 | * 'name' is one of the names enumerated by ->enumerate_names() for 'type'. | |
380 | * | |
381 | * Returns 0 if successful, otherwise a positive errno value. | |
382 | */ | |
abe529af BP |
383 | int (*del)(const char *type, const char *name); |
384 | ||
0aeaabc8 JP |
385 | /* Returns the type to pass to netdev_open() when a datapath of type |
386 | * 'datapath_type' has a port of type 'port_type', for a few special | |
387 | * cases when a netdev type differs from a port type. For example, | |
388 | * when using the userspace datapath, a port of type "internal" | |
389 | * needs to be opened as "tap". | |
390 | * | |
391 | * Returns either 'type' itself or a string literal, which must not | |
392 | * be freed. */ | |
393 | const char *(*port_open_type)(const char *datapath_type, | |
394 | const char *port_type); | |
395 | ||
11a574a7 JP |
396 | /* ## ------------------------ ## */ |
397 | /* ## Top-Level type Functions ## */ | |
398 | /* ## ------------------------ ## */ | |
399 | ||
400 | /* Performs any periodic activity required on ofprotos of type | |
401 | * 'type'. | |
402 | * | |
403 | * An ofproto provider may implement it or not, depending on whether | |
404 | * it needs type-level maintenance. | |
405 | * | |
406 | * Returns 0 if successful, otherwise a positive errno value. */ | |
407 | int (*type_run)(const char *type); | |
408 | ||
409 | /* Performs periodic activity required on ofprotos of type 'type' | |
410 | * that needs to be done with the least possible latency. | |
411 | * | |
412 | * This is run multiple times per main loop. An ofproto provider may | |
413 | * implement it or not, according to whether it provides a performance | |
414 | * boost for that ofproto implementation. | |
415 | * | |
416 | * Returns 0 if successful, otherwise a positive errno value. */ | |
417 | int (*type_run_fast)(const char *type); | |
418 | ||
419 | /* Causes the poll loop to wake up when a type 'type''s 'run' | |
420 | * function needs to be called, e.g. by calling the timer or fd | |
421 | * waiting functions in poll-loop.h. | |
422 | * | |
423 | * An ofproto provider may implement it or not, depending on whether | |
424 | * it needs type-level maintenance. */ | |
425 | void (*type_wait)(const char *type); | |
426 | ||
abe529af BP |
427 | /* ## --------------------------- ## */ |
428 | /* ## Top-Level ofproto Functions ## */ | |
429 | /* ## --------------------------- ## */ | |
430 | ||
431 | /* Life-cycle functions for an "ofproto" (see "Life Cycle" above). | |
7ee20df1 BP |
432 | * |
433 | * | |
434 | * Construction | |
435 | * ============ | |
abe529af | 436 | * |
073e2a6f BP |
437 | * ->construct() should not modify any base members of the ofproto. The |
438 | * client will initialize the ofproto's 'ports' and 'tables' members after | |
439 | * construction is complete. | |
6c1491fb | 440 | * |
073e2a6f BP |
441 | * When ->construct() is called, the client does not yet know how many flow |
442 | * tables the datapath supports, so ofproto->n_tables will be 0 and | |
0f5f95a9 BP |
443 | * ofproto->tables will be NULL. ->construct() should call |
444 | * ofproto_init_tables() to allocate and initialize ofproto->n_tables and | |
445 | * ofproto->tables. Each flow table will be initially empty, so | |
446 | * ->construct() should delete flows from the underlying datapath, if | |
447 | * necessary, rather than populating the tables. | |
abe529af | 448 | * |
91858960 BP |
449 | * If the ofproto knows the maximum port number that the datapath can have, |
450 | * then it can call ofproto_init_max_ports(). If it does so, then the | |
451 | * client will ensure that the actions it allows to be used through | |
452 | * OpenFlow do not refer to ports above that maximum number. | |
453 | * | |
abe529af BP |
454 | * Only one ofproto instance needs to be supported for any given datapath. |
455 | * If a datapath is already open as part of one "ofproto", then another | |
456 | * attempt to "construct" the same datapath as part of another ofproto is | |
5bf0e941 BP |
457 | * allowed to fail with an error. |
458 | * | |
459 | * ->construct() returns 0 if successful, otherwise a positive errno | |
7ee20df1 BP |
460 | * value. |
461 | * | |
462 | * | |
463 | * Destruction | |
464 | * =========== | |
465 | * | |
073e2a6f BP |
466 | * If 'ofproto' has any pending asynchronous operations, ->destruct() |
467 | * must complete all of them by calling ofoperation_complete(). | |
7ee20df1 | 468 | * |
073e2a6f BP |
469 | * ->destruct() must also destroy all remaining rules in the ofproto's |
470 | * tables, by passing each remaining rule to ofproto_rule_destroy(). The | |
471 | * client will destroy the flow tables themselves after ->destruct() | |
472 | * returns. | |
7ee20df1 | 473 | */ |
abe529af | 474 | struct ofproto *(*alloc)(void); |
0f5f95a9 | 475 | int (*construct)(struct ofproto *ofproto); |
abe529af BP |
476 | void (*destruct)(struct ofproto *ofproto); |
477 | void (*dealloc)(struct ofproto *ofproto); | |
478 | ||
479 | /* Performs any periodic activity required by 'ofproto'. It should: | |
480 | * | |
481 | * - Call connmgr_send_packet_in() for each received packet that missed | |
482 | * in the OpenFlow flow table or that had a OFPP_CONTROLLER output | |
483 | * action. | |
484 | * | |
485 | * - Call ofproto_rule_expire() for each OpenFlow flow that has reached | |
486 | * its hard_timeout or idle_timeout, to expire the flow. | |
5bf0e941 | 487 | * |
e2a3d183 BP |
488 | * (But rules that are part of a pending operation, e.g. rules for |
489 | * which ->pending is true, may not expire.) | |
490 | * | |
5fcc0d00 | 491 | * Returns 0 if successful, otherwise a positive errno value. */ |
abe529af BP |
492 | int (*run)(struct ofproto *ofproto); |
493 | ||
5fcc0d00 BP |
494 | /* Performs periodic activity required by 'ofproto' that needs to be done |
495 | * with the least possible latency. | |
496 | * | |
497 | * This is run multiple times per main loop. An ofproto provider may | |
498 | * implement it or not, according to whether it provides a performance | |
499 | * boost for that ofproto implementation. */ | |
500 | int (*run_fast)(struct ofproto *ofproto); | |
501 | ||
abe529af BP |
502 | /* Causes the poll loop to wake up when 'ofproto''s 'run' function needs to |
503 | * be called, e.g. by calling the timer or fd waiting functions in | |
504 | * poll-loop.h. */ | |
505 | void (*wait)(struct ofproto *ofproto); | |
506 | ||
0d085684 BP |
507 | /* Adds some memory usage statistics for the implementation of 'ofproto' |
508 | * into 'usage', for use with memory_report(). | |
509 | * | |
510 | * This function is optional. */ | |
511 | void (*get_memory_usage)(const struct ofproto *ofproto, | |
512 | struct simap *usage); | |
513 | ||
abe529af BP |
514 | /* Every "struct rule" in 'ofproto' is about to be deleted, one by one. |
515 | * This function may prepare for that, for example by clearing state in | |
516 | * advance. It should *not* actually delete any "struct rule"s from | |
517 | * 'ofproto', only prepare for it. | |
518 | * | |
519 | * This function is optional; it's really just for optimization in case | |
520 | * it's cheaper to delete all the flows from your hardware in a single pass | |
521 | * than to do it one by one. */ | |
522 | void (*flush)(struct ofproto *ofproto); | |
523 | ||
6c1491fb BP |
524 | /* Helper for the OpenFlow OFPT_FEATURES_REQUEST request. |
525 | * | |
526 | * The implementation should store true in '*arp_match_ip' if the switch | |
527 | * supports matching IP addresses inside ARP requests and replies, false | |
528 | * otherwise. | |
529 | * | |
530 | * The implementation should store in '*actions' a bitmap of the supported | |
9e1fd49b | 531 | * OpenFlow actions. Vendor actions are not included in '*actions'. */ |
6c1491fb | 532 | void (*get_features)(struct ofproto *ofproto, |
9e1fd49b BP |
533 | bool *arp_match_ip, |
534 | enum ofputil_action_bitmap *actions); | |
6c1491fb BP |
535 | |
536 | /* Helper for the OpenFlow OFPST_TABLE statistics request. | |
537 | * | |
538 | * The 'ots' array contains 'ofproto->n_tables' elements. Each element is | |
539 | * initialized as: | |
540 | * | |
541 | * - 'table_id' to the array index. | |
542 | * | |
543 | * - 'name' to "table#" where # is the table ID. | |
544 | * | |
307975da SH |
545 | * - 'match' and 'wildcards' to OFPXMT12_MASK. |
546 | * | |
547 | * - 'write_actions' and 'apply_actions' to OFPAT12_OUTPUT. | |
548 | * | |
549 | * - 'write_setfields' and 'apply_setfields' to OFPXMT12_MASK. | |
550 | * | |
551 | * - 'metadata_match' and 'metadata_write' to UINT64_MAX. | |
552 | * | |
553 | * - 'instructions' to OFPIT11_ALL. | |
554 | * | |
555 | * - 'config' to OFPTC11_TABLE_MISS_MASK. | |
6c1491fb BP |
556 | * |
557 | * - 'max_entries' to 1,000,000. | |
558 | * | |
559 | * - 'active_count' to the classifier_count() for the table. | |
560 | * | |
561 | * - 'lookup_count' and 'matched_count' to 0. | |
562 | * | |
563 | * The implementation should update any members in each element for which | |
564 | * it has better values: | |
565 | * | |
566 | * - 'name' to a more meaningful name. | |
567 | * | |
568 | * - 'wildcards' to the set of wildcards actually supported by the table | |
569 | * (if it doesn't support all OpenFlow wildcards). | |
570 | * | |
307975da SH |
571 | * - 'instructions' to set the instructions actually supported by |
572 | * the table. | |
573 | * | |
574 | * - 'write_actions' to set the write actions actually supported by | |
575 | * the table (if it doesn't support all OpenFlow actions). | |
576 | * | |
577 | * - 'apply_actions' to set the apply actions actually supported by | |
578 | * the table (if it doesn't support all OpenFlow actions). | |
579 | * | |
580 | * - 'write_setfields' to set the write setfields actually supported by | |
581 | * the table. | |
582 | * | |
583 | * - 'apply_setfields' to set the apply setfields actually supported by | |
584 | * the table. | |
585 | * | |
6c1491fb BP |
586 | * - 'max_entries' to the maximum number of flows actually supported by |
587 | * the hardware. | |
588 | * | |
589 | * - 'lookup_count' to the number of packets looked up in this flow table | |
590 | * so far. | |
591 | * | |
592 | * - 'matched_count' to the number of packets looked up in this flow | |
593 | * table so far that matched one of the flow entries. | |
594 | * | |
307975da SH |
595 | * All of the members of struct ofp12_table_stats are in network byte |
596 | * order. | |
6c1491fb | 597 | */ |
307975da | 598 | void (*get_tables)(struct ofproto *ofproto, struct ofp12_table_stats *ots); |
6c1491fb | 599 | |
abe529af BP |
600 | /* ## ---------------- ## */ |
601 | /* ## ofport Functions ## */ | |
602 | /* ## ---------------- ## */ | |
603 | ||
604 | /* Life-cycle functions for a "struct ofport" (see "Life Cycle" above). | |
605 | * | |
606 | * ->port_construct() should not modify any base members of the ofport. | |
e1b1d06a JP |
607 | * An ofproto implementation should use the 'ofp_port' member of |
608 | * "struct ofport" as the OpenFlow port number. | |
abe529af BP |
609 | * |
610 | * ofports are managed by the base ofproto code. The ofproto | |
611 | * implementation should only create and destroy them in response to calls | |
612 | * to these functions. The base ofproto code will create and destroy | |
613 | * ofports in the following situations: | |
614 | * | |
615 | * - Just after the ->construct() function is called, the base ofproto | |
616 | * iterates over all of the implementation's ports, using | |
617 | * ->port_dump_start() and related functions, and constructs an ofport | |
618 | * for each dumped port. | |
619 | * | |
620 | * - If ->port_poll() reports that a specific port has changed, then the | |
621 | * base ofproto will query that port with ->port_query_by_name() and | |
622 | * construct or destruct ofports as necessary to reflect the updated | |
623 | * set of ports. | |
624 | * | |
625 | * - If ->port_poll() returns ENOBUFS to report an unspecified port set | |
626 | * change, then the base ofproto will iterate over all of the | |
627 | * implementation's ports, in the same way as at ofproto | |
628 | * initialization, and construct and destruct ofports to reflect all of | |
629 | * the changes. | |
5bf0e941 BP |
630 | * |
631 | * ->port_construct() returns 0 if successful, otherwise a positive errno | |
632 | * value. | |
abe529af BP |
633 | */ |
634 | struct ofport *(*port_alloc)(void); | |
635 | int (*port_construct)(struct ofport *ofport); | |
636 | void (*port_destruct)(struct ofport *ofport); | |
637 | void (*port_dealloc)(struct ofport *ofport); | |
638 | ||
639 | /* Called after 'ofport->netdev' is replaced by a new netdev object. If | |
640 | * the ofproto implementation uses the ofport's netdev internally, then it | |
641 | * should switch to using the new one. The old one has been closed. | |
642 | * | |
643 | * An ofproto implementation that doesn't need to do anything in this | |
644 | * function may use a null pointer. */ | |
645 | void (*port_modified)(struct ofport *ofport); | |
646 | ||
9e1fd49b BP |
647 | /* Called after an OpenFlow request changes a port's configuration. |
648 | * 'ofport->pp.config' contains the new configuration. 'old_config' | |
649 | * contains the previous configuration. | |
abe529af | 650 | * |
9e1fd49b BP |
651 | * The caller implements OFPUTIL_PC_PORT_DOWN using netdev functions to |
652 | * turn NETDEV_UP on and off, so this function doesn't have to do anything | |
653 | * for that bit (and it won't be called if that is the only bit that | |
abe529af | 654 | * changes). */ |
9e1fd49b BP |
655 | void (*port_reconfigured)(struct ofport *ofport, |
656 | enum ofputil_port_config old_config); | |
abe529af BP |
657 | |
658 | /* Looks up a port named 'devname' in 'ofproto'. On success, initializes | |
659 | * '*port' appropriately. | |
660 | * | |
661 | * The caller owns the data in 'port' and must free it with | |
662 | * ofproto_port_destroy() when it is no longer needed. */ | |
663 | int (*port_query_by_name)(const struct ofproto *ofproto, | |
664 | const char *devname, struct ofproto_port *port); | |
665 | ||
e1b1d06a JP |
666 | /* Attempts to add 'netdev' as a port on 'ofproto'. Returns 0 if |
667 | * successful, otherwise a positive errno value. The caller should | |
668 | * inform the implementation of the OpenFlow port through the | |
669 | * ->port_construct() method. | |
5bf0e941 BP |
670 | * |
671 | * It doesn't matter whether the new port will be returned by a later call | |
672 | * to ->port_poll(); the implementation may do whatever is more | |
673 | * convenient. */ | |
e1b1d06a | 674 | int (*port_add)(struct ofproto *ofproto, struct netdev *netdev); |
abe529af | 675 | |
5bf0e941 BP |
676 | /* Deletes port number 'ofp_port' from the datapath for 'ofproto'. Returns |
677 | * 0 if successful, otherwise a positive errno value. | |
678 | * | |
679 | * It doesn't matter whether the new port will be returned by a later call | |
680 | * to ->port_poll(); the implementation may do whatever is more | |
681 | * convenient. */ | |
abe529af BP |
682 | int (*port_del)(struct ofproto *ofproto, uint16_t ofp_port); |
683 | ||
6527c598 PS |
684 | /* Get port stats */ |
685 | int (*port_get_stats)(const struct ofport *port, | |
686 | struct netdev_stats *stats); | |
687 | ||
d39258c8 BP |
688 | /* Port iteration functions. |
689 | * | |
690 | * The client might not be entirely in control of the ports within an | |
691 | * ofproto. Some hardware implementations, for example, might have a fixed | |
acf60855 JP |
692 | * set of ports in a datapath. For this reason, the client needs a way to |
693 | * iterate through all the ports that are actually in a datapath. These | |
694 | * functions provide that functionality. | |
d39258c8 BP |
695 | * |
696 | * The 'state' pointer provides the implementation a place to | |
697 | * keep track of its position. Its format is opaque to the caller. | |
698 | * | |
699 | * The ofproto provider retains ownership of the data that it stores into | |
700 | * ->port_dump_next()'s 'port' argument. The data must remain valid until | |
701 | * at least the next call to ->port_dump_next() or ->port_dump_done() for | |
702 | * 'state'. The caller will not modify or free it. | |
703 | * | |
704 | * Details | |
705 | * ======= | |
706 | * | |
707 | * ->port_dump_start() attempts to begin dumping the ports in 'ofproto'. | |
708 | * On success, it should return 0 and initialize '*statep' with any data | |
709 | * needed for iteration. On failure, returns a positive errno value, and | |
710 | * the client will not call ->port_dump_next() or ->port_dump_done(). | |
711 | * | |
712 | * ->port_dump_next() attempts to retrieve another port from 'ofproto' for | |
713 | * 'state'. If there is another port, it should store the port's | |
714 | * information into 'port' and return 0. It should return EOF if all ports | |
715 | * have already been iterated. Otherwise, on error, it should return a | |
716 | * positive errno value. This function will not be called again once it | |
717 | * returns nonzero once for a given iteration (but the 'port_dump_done' | |
718 | * function will be called afterward). | |
719 | * | |
720 | * ->port_dump_done() allows the implementation to release resources used | |
721 | * for iteration. The caller might decide to stop iteration in the middle | |
722 | * by calling this function before ->port_dump_next() returns nonzero. | |
723 | * | |
724 | * Usage Example | |
725 | * ============= | |
726 | * | |
727 | * int error; | |
728 | * void *state; | |
729 | * | |
730 | * error = ofproto->ofproto_class->port_dump_start(ofproto, &state); | |
731 | * if (!error) { | |
732 | * for (;;) { | |
733 | * struct ofproto_port port; | |
734 | * | |
735 | * error = ofproto->ofproto_class->port_dump_next( | |
736 | * ofproto, state, &port); | |
737 | * if (error) { | |
738 | * break; | |
739 | * } | |
740 | * // Do something with 'port' here (without modifying or freeing | |
741 | * // any of its data). | |
742 | * } | |
743 | * ofproto->ofproto_class->port_dump_done(ofproto, state); | |
744 | * } | |
745 | * // 'error' is now EOF (success) or a positive errno value (failure). | |
746 | */ | |
abe529af | 747 | int (*port_dump_start)(const struct ofproto *ofproto, void **statep); |
abe529af BP |
748 | int (*port_dump_next)(const struct ofproto *ofproto, void *state, |
749 | struct ofproto_port *port); | |
abe529af BP |
750 | int (*port_dump_done)(const struct ofproto *ofproto, void *state); |
751 | ||
752 | /* Polls for changes in the set of ports in 'ofproto'. If the set of ports | |
753 | * in 'ofproto' has changed, then this function should do one of the | |
754 | * following: | |
755 | * | |
756 | * - Preferably: store the name of the device that was added to or deleted | |
757 | * from 'ofproto' in '*devnamep' and return 0. The caller is responsible | |
758 | * for freeing '*devnamep' (with free()) when it no longer needs it. | |
759 | * | |
760 | * - Alternatively: return ENOBUFS, without indicating the device that was | |
761 | * added or deleted. | |
762 | * | |
763 | * Occasional 'false positives', in which the function returns 0 while | |
764 | * indicating a device that was not actually added or deleted or returns | |
765 | * ENOBUFS without any change, are acceptable. | |
766 | * | |
767 | * The purpose of 'port_poll' is to let 'ofproto' know about changes made | |
768 | * externally to the 'ofproto' object, e.g. by a system administrator via | |
769 | * ovs-dpctl. Therefore, it's OK, and even preferable, for port_poll() to | |
770 | * not report changes made through calls to 'port_add' or 'port_del' on the | |
771 | * same 'ofproto' object. (But it's OK for it to report them too, just | |
772 | * slightly less efficient.) | |
773 | * | |
774 | * If the set of ports in 'ofproto' has not changed, returns EAGAIN. May | |
775 | * also return other positive errno values to indicate that something has | |
5bf0e941 BP |
776 | * gone wrong. |
777 | * | |
778 | * If the set of ports in a datapath is fixed, or if the only way that the | |
779 | * set of ports in a datapath can change is through ->port_add() and | |
780 | * ->port_del(), then this function may be a null pointer. | |
781 | */ | |
abe529af BP |
782 | int (*port_poll)(const struct ofproto *ofproto, char **devnamep); |
783 | ||
5bf0e941 BP |
784 | /* Arranges for the poll loop to wake up when ->port_poll() will return a |
785 | * value other than EAGAIN. | |
786 | * | |
787 | * If the set of ports in a datapath is fixed, or if the only way that the | |
788 | * set of ports in a datapath can change is through ->port_add() and | |
789 | * ->port_del(), or if the poll loop will always wake up anyway when | |
790 | * ->port_poll() will return a value other than EAGAIN, then this function | |
791 | * may be a null pointer. | |
792 | */ | |
abe529af BP |
793 | void (*port_poll_wait)(const struct ofproto *ofproto); |
794 | ||
5bf0e941 BP |
795 | /* Checks the status of LACP negotiation for 'port'. Returns 1 if LACP |
796 | * partner information for 'port' is up-to-date, 0 if LACP partner | |
797 | * information is not current (generally indicating a connectivity | |
798 | * problem), or -1 if LACP is not enabled on 'port'. | |
799 | * | |
800 | * This function may be a null pointer if the ofproto implementation does | |
801 | * not support LACP. */ | |
abe529af BP |
802 | int (*port_is_lacp_current)(const struct ofport *port); |
803 | ||
5bf0e941 BP |
804 | /* ## ----------------------- ## */ |
805 | /* ## OpenFlow Rule Functions ## */ | |
806 | /* ## ----------------------- ## */ | |
807 | ||
81a76618 | 808 | /* Chooses an appropriate table for 'match' within 'ofproto'. On |
0ab6decf | 809 | * success, stores the table ID into '*table_idp' and returns 0. On |
90bf1e07 | 810 | * failure, returns an OpenFlow error code. |
0ab6decf | 811 | * |
81a76618 | 812 | * The choice of table should be a function of 'match' and 'ofproto''s |
0ab6decf BP |
813 | * datapath capabilities. It should not depend on the flows already in |
814 | * 'ofproto''s flow tables. Failure implies that an OpenFlow rule with | |
81a76618 BP |
815 | * 'match' as its matching condition can never be inserted into 'ofproto', |
816 | * even starting from an empty flow table. | |
0ab6decf BP |
817 | * |
818 | * If multiple tables are candidates for inserting the flow, the function | |
819 | * should choose one arbitrarily (but deterministically). | |
820 | * | |
13521ff5 | 821 | * If this function is NULL then table 0 is always chosen. */ |
90bf1e07 | 822 | enum ofperr (*rule_choose_table)(const struct ofproto *ofproto, |
81a76618 | 823 | const struct match *match, |
90bf1e07 | 824 | uint8_t *table_idp); |
0ab6decf | 825 | |
5bf0e941 BP |
826 | /* Life-cycle functions for a "struct rule" (see "Life Cycle" above). |
827 | * | |
5bf0e941 | 828 | * |
7ee20df1 BP |
829 | * Asynchronous Operation Support |
830 | * ============================== | |
831 | * | |
832 | * The life-cycle operations on rules can operate asynchronously, meaning | |
833 | * that ->rule_construct() and ->rule_destruct() only need to initiate | |
834 | * their respective operations and do not need to wait for them to complete | |
835 | * before they return. ->rule_modify_actions() also operates | |
836 | * asynchronously. | |
837 | * | |
838 | * An ofproto implementation reports the success or failure of an | |
839 | * asynchronous operation on a rule using the rule's 'pending' member, | |
840 | * which points to a opaque "struct ofoperation" that represents the | |
841 | * ongoing opreation. When the operation completes, the ofproto | |
842 | * implementation calls ofoperation_complete(), passing the ofoperation and | |
843 | * an error indication. | |
844 | * | |
845 | * Only the following contexts may call ofoperation_complete(): | |
846 | * | |
847 | * - The function called to initiate the operation, | |
848 | * e.g. ->rule_construct() or ->rule_destruct(). This is the best | |
849 | * choice if the operation completes quickly. | |
850 | * | |
851 | * - The implementation's ->run() function. | |
852 | * | |
853 | * - The implementation's ->destruct() function. | |
854 | * | |
855 | * The ofproto base code updates the flow table optimistically, assuming | |
856 | * that the operation will probably succeed: | |
857 | * | |
858 | * - ofproto adds or replaces the rule in the flow table before calling | |
859 | * ->rule_construct(). | |
860 | * | |
861 | * - ofproto updates the rule's actions before calling | |
862 | * ->rule_modify_actions(). | |
863 | * | |
864 | * - ofproto removes the rule before calling ->rule_destruct(). | |
5bf0e941 | 865 | * |
7ee20df1 BP |
866 | * With one exception, when an asynchronous operation completes with an |
867 | * error, ofoperation_complete() backs out the already applied changes: | |
868 | * | |
869 | * - If adding or replacing a rule in the flow table fails, ofproto | |
870 | * removes the new rule or restores the original rule. | |
871 | * | |
872 | * - If modifying a rule's actions fails, ofproto restores the original | |
873 | * actions. | |
874 | * | |
875 | * - Removing a rule is not allowed to fail. It must always succeed. | |
876 | * | |
877 | * The ofproto base code serializes operations: if any operation is in | |
878 | * progress on a given rule, ofproto postpones initiating any new operation | |
879 | * on that rule until the pending operation completes. Therefore, every | |
880 | * operation must eventually complete through a call to | |
881 | * ofoperation_complete() to avoid delaying new operations indefinitely | |
882 | * (including any OpenFlow request that affects the rule in question, even | |
883 | * just to query its statistics). | |
884 | * | |
885 | * | |
886 | * Construction | |
887 | * ============ | |
888 | * | |
889 | * When ->rule_construct() is called, the caller has already inserted | |
890 | * 'rule' into 'rule->ofproto''s flow table numbered 'rule->table_id'. | |
891 | * There are two cases: | |
892 | * | |
893 | * - 'rule' is a new rule in its flow table. In this case, | |
894 | * ofoperation_get_victim(rule) returns NULL. | |
895 | * | |
896 | * - 'rule' is replacing an existing rule in its flow table that had the | |
897 | * same matching criteria and priority. In this case, | |
a6a62132 BP |
898 | * ofoperation_get_victim(rule) returns the rule being replaced (the |
899 | * "victim" rule). | |
7ee20df1 BP |
900 | * |
901 | * ->rule_construct() should set the following in motion: | |
902 | * | |
903 | * - Validate that the matching rule in 'rule->cr' is supported by the | |
904 | * datapath. For example, if the rule's table does not support | |
905 | * registers, then it is an error if 'rule->cr' does not wildcard all | |
5bf0e941 BP |
906 | * registers. |
907 | * | |
548de4dd | 908 | * - Validate that the datapath can correctly implement 'rule->ofpacts'. |
5bf0e941 | 909 | * |
7ee20df1 BP |
910 | * - If the rule is valid, update the datapath flow table, adding the new |
911 | * rule or replacing the existing one. | |
5bf0e941 | 912 | * |
a6a62132 BP |
913 | * - If 'rule' is replacing an existing rule, uninitialize any derived |
914 | * state for the victim rule, as in step 5 in the "Life Cycle" | |
915 | * described above. | |
916 | * | |
7ee20df1 | 917 | * (On failure, the ofproto code will roll back the insertion from the flow |
a6a62132 BP |
918 | * table, either removing 'rule' or replacing it by the victim rule if |
919 | * there is one.) | |
08944c1d | 920 | * |
7ee20df1 | 921 | * ->rule_construct() must act in one of the following ways: |
08944c1d | 922 | * |
7ee20df1 | 923 | * - If it succeeds, it must call ofoperation_complete() and return 0. |
5bf0e941 | 924 | * |
7ee20df1 | 925 | * - If it fails, it must act in one of the following ways: |
5bf0e941 | 926 | * |
7ee20df1 | 927 | * * Call ofoperation_complete() and return 0. |
5bf0e941 | 928 | * |
90bf1e07 BP |
929 | * * Return an OpenFlow error code. (Do not call |
930 | * ofoperation_complete() in this case.) | |
5bf0e941 | 931 | * |
dc12d1c3 BP |
932 | * Either way, ->rule_destruct() will not be called for 'rule', but |
933 | * ->rule_dealloc() will be. | |
7ee20df1 BP |
934 | * |
935 | * - If the operation is only partially complete, then it must return 0. | |
936 | * Later, when the operation is complete, the ->run() or ->destruct() | |
937 | * function must call ofoperation_complete() to report success or | |
938 | * failure. | |
939 | * | |
940 | * ->rule_construct() should not modify any base members of struct rule. | |
941 | * | |
942 | * | |
943 | * Destruction | |
944 | * =========== | |
945 | * | |
946 | * When ->rule_destruct() is called, the caller has already removed 'rule' | |
947 | * from 'rule->ofproto''s flow table. ->rule_destruct() should set in | |
948 | * motion removing 'rule' from the datapath flow table. If removal | |
949 | * completes synchronously, it should call ofoperation_complete(). | |
950 | * Otherwise, the ->run() or ->destruct() function must later call | |
951 | * ofoperation_complete() after the operation completes. | |
952 | * | |
953 | * Rule destruction must not fail. */ | |
abe529af | 954 | struct rule *(*rule_alloc)(void); |
90bf1e07 | 955 | enum ofperr (*rule_construct)(struct rule *rule); |
abe529af BP |
956 | void (*rule_destruct)(struct rule *rule); |
957 | void (*rule_dealloc)(struct rule *rule); | |
958 | ||
5bf0e941 BP |
959 | /* Obtains statistics for 'rule', storing the number of packets that have |
960 | * matched it in '*packet_count' and the number of bytes in those packets | |
5e9d0469 BP |
961 | * in '*byte_count'. UINT64_MAX indicates that the packet count or byte |
962 | * count is unknown. */ | |
abe529af BP |
963 | void (*rule_get_stats)(struct rule *rule, uint64_t *packet_count, |
964 | uint64_t *byte_count); | |
965 | ||
5bf0e941 BP |
966 | /* Applies the actions in 'rule' to 'packet'. (This implements sending |
967 | * buffered packets for OpenFlow OFPT_FLOW_MOD commands.) | |
968 | * | |
969 | * Takes ownership of 'packet' (so it should eventually free it, with | |
970 | * ofpbuf_delete()). | |
971 | * | |
972 | * 'flow' reflects the flow information for 'packet'. All of the | |
973 | * information in 'flow' is extracted from 'packet', except for | |
296e07ac | 974 | * flow->tunnel and flow->in_port, which are assigned the correct values |
0e553d9c BP |
975 | * for the incoming packet. The register values are zeroed. 'packet''s |
976 | * header pointers (e.g. packet->l3) are appropriately initialized. | |
5bf0e941 | 977 | * |
0e553d9c | 978 | * The implementation should add the statistics for 'packet' into 'rule'. |
5bf0e941 | 979 | * |
90bf1e07 BP |
980 | * Returns 0 if successful, otherwise an OpenFlow error code. */ |
981 | enum ofperr (*rule_execute)(struct rule *rule, const struct flow *flow, | |
982 | struct ofpbuf *packet); | |
5bf0e941 | 983 | |
7ee20df1 BP |
984 | /* When ->rule_modify_actions() is called, the caller has already replaced |
985 | * the OpenFlow actions in 'rule' by a new set. (The original actions are | |
986 | * in rule->pending->actions.) | |
987 | * | |
988 | * ->rule_modify_actions() should set the following in motion: | |
989 | * | |
548de4dd BP |
990 | * - Validate that the datapath can correctly implement the actions now |
991 | * in 'rule'. | |
7ee20df1 BP |
992 | * |
993 | * - Update the datapath flow table with the new actions. | |
994 | * | |
995 | * If the operation synchronously completes, ->rule_modify_actions() may | |
996 | * call ofoperation_complete() before it returns. Otherwise, ->run() | |
997 | * should call ofoperation_complete() later, after the operation does | |
998 | * complete. | |
999 | * | |
1000 | * If the operation fails, then the base ofproto code will restore the | |
1001 | * original 'actions' and 'n_actions' of 'rule'. | |
5bf0e941 | 1002 | * |
7ee20df1 BP |
1003 | * ->rule_modify_actions() should not modify any base members of struct |
1004 | * rule. */ | |
1005 | void (*rule_modify_actions)(struct rule *rule); | |
abe529af | 1006 | |
7257b535 BP |
1007 | /* Changes the OpenFlow IP fragment handling policy to 'frag_handling', |
1008 | * which takes one of the following values, with the corresponding | |
1009 | * meanings: | |
1010 | * | |
1011 | * - OFPC_FRAG_NORMAL: The switch should treat IP fragments the same way | |
1012 | * as other packets, omitting TCP and UDP port numbers (always setting | |
1013 | * them to 0). | |
1014 | * | |
1015 | * - OFPC_FRAG_DROP: The switch should drop all IP fragments without | |
1016 | * passing them through the flow table. | |
1017 | * | |
1018 | * - OFPC_FRAG_REASM: The switch should reassemble IP fragments before | |
1019 | * passing packets through the flow table. | |
1020 | * | |
1021 | * - OFPC_FRAG_NX_MATCH (a Nicira extension): Similar to OFPC_FRAG_NORMAL, | |
1022 | * except that TCP and UDP port numbers should be included in fragments | |
1023 | * with offset 0. | |
1024 | * | |
1025 | * Implementations are not required to support every mode. | |
1026 | * OFPC_FRAG_NORMAL is the default mode when an ofproto is created. | |
1027 | * | |
1028 | * At the time of the call to ->set_frag_handling(), the current mode is | |
1029 | * available in 'ofproto->frag_handling'. ->set_frag_handling() returns | |
1030 | * true if the requested mode was set, false if it is not supported. | |
1031 | * | |
1032 | * Upon successful return, the caller changes 'ofproto->frag_handling' to | |
1033 | * reflect the new mode. | |
1034 | */ | |
1035 | bool (*set_frag_handling)(struct ofproto *ofproto, | |
1036 | enum ofp_config_flags frag_handling); | |
abe529af | 1037 | |
5bf0e941 | 1038 | /* Implements the OpenFlow OFPT_PACKET_OUT command. The datapath should |
f25d0cf3 | 1039 | * execute the 'ofpacts_len' bytes of "struct ofpacts" in 'ofpacts'. |
5bf0e941 | 1040 | * |
f25d0cf3 BP |
1041 | * The caller retains ownership of 'packet' and of 'ofpacts', so |
1042 | * ->packet_out() should not modify or free them. | |
5bf0e941 | 1043 | * |
548de4dd BP |
1044 | * This function must validate that it can correctly implement 'ofpacts'. |
1045 | * If not, then it should return an OpenFlow error code. | |
5bf0e941 BP |
1046 | * |
1047 | * 'flow' reflects the flow information for 'packet'. All of the | |
1048 | * information in 'flow' is extracted from 'packet', except for | |
296e07ac | 1049 | * flow->in_port (see below). flow->tunnel and its register values are |
751c7785 BP |
1050 | * zeroed. |
1051 | * | |
1052 | * flow->in_port comes from the OpenFlow OFPT_PACKET_OUT message. The | |
1053 | * implementation should reject invalid flow->in_port values by returning | |
2e1bfcb6 | 1054 | * OFPERR_OFPBRC_BAD_PORT. (If the implementation called |
91858960 BP |
1055 | * ofproto_init_max_ports(), then the client will reject these ports |
1056 | * itself.) For consistency, the implementation should consider valid for | |
1057 | * flow->in_port any value that could possibly be seen in a packet that it | |
1058 | * passes to connmgr_send_packet_in(). Ideally, even an implementation | |
1059 | * that never generates packet-ins (e.g. due to hardware limitations) | |
1060 | * should still allow flow->in_port values for every possible physical port | |
1061 | * and OFPP_LOCAL. The only virtual ports (those above OFPP_MAX) that the | |
1062 | * caller will ever pass in as flow->in_port, other than OFPP_LOCAL, are | |
1063 | * OFPP_NONE and OFPP_CONTROLLER. The implementation should allow both of | |
1064 | * these, treating each of them as packets generated by the controller as | |
1065 | * opposed to packets originating from some switch port. | |
751c7785 BP |
1066 | * |
1067 | * (Ordinarily the only effect of flow->in_port is on output actions that | |
1068 | * involve the input port, such as actions that output to OFPP_IN_PORT, | |
1069 | * OFPP_FLOOD, or OFPP_ALL. flow->in_port can also affect Nicira extension | |
1070 | * "resubmit" actions.) | |
5bf0e941 BP |
1071 | * |
1072 | * 'packet' is not matched against the OpenFlow flow table, so its | |
1073 | * statistics should not be included in OpenFlow flow statistics. | |
1074 | * | |
90bf1e07 BP |
1075 | * Returns 0 if successful, otherwise an OpenFlow error code. */ |
1076 | enum ofperr (*packet_out)(struct ofproto *ofproto, struct ofpbuf *packet, | |
1077 | const struct flow *flow, | |
f25d0cf3 BP |
1078 | const struct ofpact *ofpacts, |
1079 | size_t ofpacts_len); | |
5bf0e941 BP |
1080 | |
1081 | /* ## ------------------------- ## */ | |
1082 | /* ## OFPP_NORMAL configuration ## */ | |
1083 | /* ## ------------------------- ## */ | |
1084 | ||
abe529af BP |
1085 | /* Configures NetFlow on 'ofproto' according to the options in |
1086 | * 'netflow_options', or turns off NetFlow if 'netflow_options' is NULL. | |
1087 | * | |
1088 | * EOPNOTSUPP as a return value indicates that 'ofproto' does not support | |
f8cd50a4 | 1089 | * NetFlow, as does a null pointer. */ |
abe529af BP |
1090 | int (*set_netflow)(struct ofproto *ofproto, |
1091 | const struct netflow_options *netflow_options); | |
1092 | ||
1093 | void (*get_netflow_ids)(const struct ofproto *ofproto, | |
1094 | uint8_t *engine_type, uint8_t *engine_id); | |
1095 | ||
1096 | /* Configures sFlow on 'ofproto' according to the options in | |
1097 | * 'sflow_options', or turns off sFlow if 'sflow_options' is NULL. | |
1098 | * | |
1099 | * EOPNOTSUPP as a return value indicates that 'ofproto' does not support | |
1100 | * sFlow, as does a null pointer. */ | |
1101 | int (*set_sflow)(struct ofproto *ofproto, | |
1102 | const struct ofproto_sflow_options *sflow_options); | |
1103 | ||
1104 | /* Configures connectivity fault management on 'ofport'. | |
1105 | * | |
a5610457 | 1106 | * If 'cfm_settings' is nonnull, configures CFM according to its members. |
abe529af | 1107 | * |
a5610457 | 1108 | * If 'cfm_settings' is null, removes any connectivity fault management |
abe529af BP |
1109 | * configuration from 'ofport'. |
1110 | * | |
1111 | * EOPNOTSUPP as a return value indicates that this ofproto_class does not | |
1112 | * support CFM, as does a null pointer. */ | |
a5610457 | 1113 | int (*set_cfm)(struct ofport *ofport, const struct cfm_settings *s); |
abe529af | 1114 | |
b9380396 EJ |
1115 | /* Checks the fault status of CFM configured on 'ofport'. Returns a |
1116 | * bitmask of 'cfm_fault_reason's to indicate a CFM fault (generally | |
1117 | * indicating a connectivity problem). Returns zero if CFM is not faulted, | |
1118 | * and -1 if CFM is not enabled on 'port'. | |
abe529af | 1119 | * |
a5610457 EJ |
1120 | * This function may be a null pointer if the ofproto implementation does |
1121 | * not support CFM. */ | |
1122 | int (*get_cfm_fault)(const struct ofport *ofport); | |
abe529af | 1123 | |
1c0333b6 EJ |
1124 | /* Check the operational status reported by the remote CFM endpoint of |
1125 | * 'ofp_port' Returns 1 if operationally up, 0 if operationally down, and | |
1126 | * -1 if CFM is not enabled on 'ofp_port' or does not support operational | |
1127 | * status. | |
1128 | * | |
1129 | * This function may be a null pointer if the ofproto implementation does | |
1130 | * not support CFM. */ | |
1131 | int (*get_cfm_opup)(const struct ofport *ofport); | |
1132 | ||
1de11730 EJ |
1133 | /* Gets the MPIDs of the remote maintenance points broadcasting to |
1134 | * 'ofport'. Populates 'rmps' with a provider owned array of MPIDs, and | |
1135 | * 'n_rmps' with the number of MPIDs in 'rmps'. Returns a number less than | |
1136 | * 0 if CFM is not enabled of 'ofport'. | |
1137 | * | |
1138 | * This function may be a null pointer if the ofproto implementation does | |
1139 | * not support CFM. */ | |
1140 | int (*get_cfm_remote_mpids)(const struct ofport *ofport, | |
1141 | const uint64_t **rmps, size_t *n_rmps); | |
1142 | ||
3967a833 MM |
1143 | /* Checks the health of CFM configured on 'ofport'. Returns an integer |
1144 | * to indicate the health percentage of the 'ofport' which is an average of | |
1145 | * the health of all the remote_mps. Returns an integer between 0 and 100 | |
1146 | * where 0 means that the 'ofport' is very unhealthy and 100 means the | |
1147 | * 'ofport' is perfectly healthy. Returns -1 if CFM is not enabled on | |
1148 | * 'port' or if the number of remote_mpids is > 1. | |
1149 | * | |
1150 | * This function may be a null pointer if the ofproto implementation does | |
1151 | * not support CFM. */ | |
1152 | int (*get_cfm_health)(const struct ofport *ofport); | |
1153 | ||
21f7563c JP |
1154 | /* Configures spanning tree protocol (STP) on 'ofproto' using the |
1155 | * settings defined in 's'. | |
1156 | * | |
1157 | * If 's' is nonnull, configures STP according to its members. | |
1158 | * | |
1159 | * If 's' is null, removes any STP configuration from 'ofproto'. | |
1160 | * | |
1161 | * EOPNOTSUPP as a return value indicates that this ofproto_class does not | |
1162 | * support STP, as does a null pointer. */ | |
1163 | int (*set_stp)(struct ofproto *ofproto, | |
1164 | const struct ofproto_stp_settings *s); | |
1165 | ||
1166 | /* Retrieves state of spanning tree protocol (STP) on 'ofproto'. | |
1167 | * | |
1168 | * Stores STP state for 'ofproto' in 's'. If the 'enabled' member | |
1169 | * is false, the other member values are not meaningful. | |
1170 | * | |
1171 | * EOPNOTSUPP as a return value indicates that this ofproto_class does not | |
1172 | * support STP, as does a null pointer. */ | |
1173 | int (*get_stp_status)(struct ofproto *ofproto, | |
1174 | struct ofproto_stp_status *s); | |
1175 | ||
1176 | /* Configures spanning tree protocol (STP) on 'ofport' using the | |
1177 | * settings defined in 's'. | |
1178 | * | |
1179 | * If 's' is nonnull, configures STP according to its members. The | |
1180 | * caller is responsible for assigning STP port numbers (using the | |
1181 | * 'port_num' member in the range of 1 through 255, inclusive) and | |
1182 | * ensuring there are no duplicates. | |
1183 | * | |
1184 | * If 's' is null, removes any STP configuration from 'ofport'. | |
1185 | * | |
1186 | * EOPNOTSUPP as a return value indicates that this ofproto_class does not | |
1187 | * support STP, as does a null pointer. */ | |
1188 | int (*set_stp_port)(struct ofport *ofport, | |
1189 | const struct ofproto_port_stp_settings *s); | |
1190 | ||
1191 | /* Retrieves spanning tree protocol (STP) port status of 'ofport'. | |
1192 | * | |
1193 | * Stores STP state for 'ofport' in 's'. If the 'enabled' member is | |
1194 | * false, the other member values are not meaningful. | |
1195 | * | |
1196 | * EOPNOTSUPP as a return value indicates that this ofproto_class does not | |
1197 | * support STP, as does a null pointer. */ | |
1198 | int (*get_stp_port_status)(struct ofport *ofport, | |
1199 | struct ofproto_port_stp_status *s); | |
1200 | ||
8b36f51e EJ |
1201 | /* Registers meta-data associated with the 'n_qdscp' Qualities of Service |
1202 | * 'queues' attached to 'ofport'. This data is not intended to be | |
1203 | * sufficient to implement QoS. Instead, providers may use this | |
1204 | * information to implement features which require knowledge of what queues | |
1205 | * exist on a port, and some basic information about them. | |
1206 | * | |
1207 | * EOPNOTSUPP as a return value indicates that this ofproto_class does not | |
1208 | * support QoS, as does a null pointer. */ | |
1209 | int (*set_queues)(struct ofport *ofport, | |
1210 | const struct ofproto_port_queue *queues, size_t n_qdscp); | |
1211 | ||
abe529af BP |
1212 | /* If 's' is nonnull, this function registers a "bundle" associated with |
1213 | * client data pointer 'aux' in 'ofproto'. A bundle is the same concept as | |
1214 | * a Port in OVSDB, that is, it consists of one or more "slave" devices | |
1215 | * (Interfaces, in OVSDB) along with VLAN and LACP configuration and, if | |
1216 | * there is more than one slave, a bonding configuration. If 'aux' is | |
1217 | * already registered then this function updates its configuration to 's'. | |
1218 | * Otherwise, this function registers a new bundle. | |
1219 | * | |
1220 | * If 's' is NULL, this function unregisters the bundle registered on | |
1221 | * 'ofproto' associated with client data pointer 'aux'. If no such bundle | |
1222 | * has been registered, this has no effect. | |
1223 | * | |
1224 | * This function affects only the behavior of the NXAST_AUTOPATH action and | |
1225 | * output to the OFPP_NORMAL port. An implementation that does not support | |
1226 | * it at all may set it to NULL or return EOPNOTSUPP. An implementation | |
1227 | * that supports only a subset of the functionality should implement what | |
1228 | * it can and return 0. */ | |
1229 | int (*bundle_set)(struct ofproto *ofproto, void *aux, | |
1230 | const struct ofproto_bundle_settings *s); | |
1231 | ||
1232 | /* If 'port' is part of any bundle, removes it from that bundle. If the | |
1233 | * bundle now has no ports, deletes the bundle. If the bundle now has only | |
1234 | * one port, deconfigures the bundle's bonding configuration. */ | |
1235 | void (*bundle_remove)(struct ofport *ofport); | |
1236 | ||
1237 | /* If 's' is nonnull, this function registers a mirror associated with | |
1238 | * client data pointer 'aux' in 'ofproto'. A mirror is the same concept as | |
1239 | * a Mirror in OVSDB. If 'aux' is already registered then this function | |
1240 | * updates its configuration to 's'. Otherwise, this function registers a | |
1241 | * new mirror. | |
1242 | * | |
1243 | * If 's' is NULL, this function unregisters the mirror registered on | |
1244 | * 'ofproto' associated with client data pointer 'aux'. If no such mirror | |
1245 | * has been registered, this has no effect. | |
1246 | * | |
c06bba01 JP |
1247 | * An implementation that does not support mirroring at all may set |
1248 | * it to NULL or return EOPNOTSUPP. An implementation that supports | |
1249 | * only a subset of the functionality should implement what it can | |
1250 | * and return 0. */ | |
abe529af BP |
1251 | int (*mirror_set)(struct ofproto *ofproto, void *aux, |
1252 | const struct ofproto_mirror_settings *s); | |
1253 | ||
9d24de3b JP |
1254 | /* Retrieves statistics from mirror associated with client data |
1255 | * pointer 'aux' in 'ofproto'. Stores packet and byte counts in | |
1256 | * 'packets' and 'bytes', respectively. If a particular counter is | |
1257 | * not supported, the appropriate argument is set to UINT64_MAX. | |
1258 | * | |
1259 | * EOPNOTSUPP as a return value indicates that this ofproto_class does not | |
1260 | * support retrieving mirror statistics. */ | |
1261 | int (*mirror_get_stats)(struct ofproto *ofproto, void *aux, | |
1262 | uint64_t *packets, uint64_t *bytes); | |
1263 | ||
abe529af BP |
1264 | /* Configures the VLANs whose bits are set to 1 in 'flood_vlans' as VLANs |
1265 | * on which all packets are flooded, instead of using MAC learning. If | |
1266 | * 'flood_vlans' is NULL, then MAC learning applies to all VLANs. | |
1267 | * | |
1268 | * This function affects only the behavior of the OFPP_NORMAL action. An | |
1269 | * implementation that does not support it may set it to NULL or return | |
1270 | * EOPNOTSUPP. */ | |
1271 | int (*set_flood_vlans)(struct ofproto *ofproto, | |
1272 | unsigned long *flood_vlans); | |
1273 | ||
1274 | /* Returns true if 'aux' is a registered bundle that is currently in use as | |
1275 | * the output for a mirror. */ | |
b4affc74 | 1276 | bool (*is_mirror_output_bundle)(const struct ofproto *ofproto, void *aux); |
8402c74b SS |
1277 | |
1278 | /* When the configuration option of forward_bpdu changes, this function | |
1279 | * will be invoked. */ | |
1280 | void (*forward_bpdu_changed)(struct ofproto *ofproto); | |
52a90c29 | 1281 | |
c4069512 BP |
1282 | /* Sets the MAC aging timeout for the OFPP_NORMAL action to 'idle_time', in |
1283 | * seconds, and the maximum number of MAC table entries to | |
1284 | * 'max_entries'. | |
1285 | * | |
1286 | * An implementation that doesn't support configuring these features may | |
1287 | * set this function to NULL or implement it as a no-op. */ | |
1288 | void (*set_mac_table_config)(struct ofproto *ofproto, | |
1289 | unsigned int idle_time, size_t max_entries); | |
e764773c | 1290 | |
52a90c29 BP |
1291 | /* Linux VLAN device support (e.g. "eth0.10" for VLAN 10.) |
1292 | * | |
1293 | * This is deprecated. It is only for compatibility with broken device drivers | |
1294 | * in old versions of Linux that do not properly support VLANs when VLAN | |
1295 | * devices are not used. When broken device drivers are no longer in | |
1296 | * widespread use, we will delete these interfaces. */ | |
1297 | ||
1298 | /* If 'realdev_ofp_port' is nonzero, then this function configures 'ofport' | |
1299 | * as a VLAN splinter port for VLAN 'vid', associated with the real device | |
1300 | * that has OpenFlow port number 'realdev_ofp_port'. | |
1301 | * | |
1302 | * If 'realdev_ofp_port' is zero, then this function deconfigures 'ofport' | |
1303 | * as a VLAN splinter port. | |
1304 | * | |
1305 | * This function should be NULL if a an implementation does not support | |
1306 | * it. */ | |
1307 | int (*set_realdev)(struct ofport *ofport, | |
1308 | uint16_t realdev_ofp_port, int vid); | |
abe529af BP |
1309 | }; |
1310 | ||
1311 | extern const struct ofproto_class ofproto_dpif_class; | |
1312 | ||
1313 | int ofproto_class_register(const struct ofproto_class *); | |
1314 | int ofproto_class_unregister(const struct ofproto_class *); | |
d08a2e92 | 1315 | |
75a75043 BP |
1316 | /* ofproto_flow_mod() returns this value if the flow_mod could not be processed |
1317 | * because it overlaps with an ongoing flow table operation that has not yet | |
1318 | * completed. The caller should retry the operation later. | |
1319 | * | |
1320 | * ofproto.c also uses this value internally for additional (similar) purposes. | |
1321 | * | |
90bf1e07 BP |
1322 | * This particular value is a good choice because it is large, so that it does |
1323 | * not collide with any errno value, but not large enough to collide with an | |
1324 | * OFPERR_* value. */ | |
1325 | enum { OFPROTO_POSTPONE = 1 << 16 }; | |
1326 | BUILD_ASSERT_DECL(OFPROTO_POSTPONE < OFPERR_OFS); | |
75a75043 BP |
1327 | |
1328 | int ofproto_flow_mod(struct ofproto *, const struct ofputil_flow_mod *); | |
81a76618 BP |
1329 | void ofproto_add_flow(struct ofproto *, const struct match *, |
1330 | unsigned int priority, | |
f25d0cf3 | 1331 | const struct ofpact *ofpacts, size_t ofpacts_len); |
81a76618 BP |
1332 | bool ofproto_delete_flow(struct ofproto *, |
1333 | const struct match *, unsigned int priority); | |
d08a2e92 BP |
1334 | void ofproto_flush_flows(struct ofproto *); |
1335 | ||
5bee6e26 | 1336 | #endif /* ofproto/ofproto-provider.h */ |