2 * Copyright (c) 2009, 2010, 2011 Nicira Networks.
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:
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
17 #ifndef OFPROTO_OFPROTO_PROVIDER_H
18 #define OFPROTO_OFPROTO_PROVIDER_H 1
20 /* Definitions for use within ofproto. */
22 #include "ofproto/ofproto.h"
24 #include "classifier.h"
29 struct ofputil_flow_mod;
31 /* An OpenFlow switch.
33 * With few exceptions, ofproto implementations may look at these fields but
34 * should not modify them. */
36 const struct ofproto_class *ofproto_class;
37 char *type; /* Datapath type. */
38 char *name; /* Datapath name. */
39 struct hmap_node hmap_node; /* In global 'all_ofprotos' hmap. */
42 uint64_t fallback_dpid; /* Datapath ID if no better choice found. */
43 uint64_t datapath_id; /* Datapath ID. */
44 unsigned flow_eviction_threshold; /* Threshold at which to begin flow
45 * table eviction. Only affects the
46 * ofproto-dpif implementation */
47 bool forward_bpdu; /* Option to allow forwarding of BPDU frames
48 * when NORMAL action is invoked. */
49 char *mfr_desc; /* Manufacturer. */
50 char *hw_desc; /* Hardware. */
51 char *sw_desc; /* Software version. */
52 char *serial_desc; /* Serial number. */
53 char *dp_desc; /* Datapath description. */
54 enum ofp_config_flags frag_handling; /* One of OFPC_*. */
57 struct hmap ports; /* Contains "struct ofport"s. */
58 struct shash port_by_name;
61 struct classifier *tables; /* Each classifier contains "struct rule"s. */
64 /* OpenFlow connections. */
65 struct connmgr *connmgr;
67 /* Flow table operation tracking. */
68 int state; /* Internal state. */
69 struct list pending; /* List of "struct ofopgroup"s. */
70 unsigned int n_pending; /* list_size(&pending). */
71 struct hmap deletions; /* All OFOPERATION_DELETE "ofoperation"s. */
73 /* Linux VLAN device support (e.g. "eth0.10" for VLAN 10.)
75 * This is deprecated. It is only for compatibility with broken device
76 * drivers in old versions of Linux that do not properly support VLANs when
77 * VLAN devices are not used. When broken device drivers are no longer in
78 * widespread use, we will delete these interfaces. */
79 unsigned long int *vlan_bitmap; /* 4096-bit bitmap of in-use VLANs. */
80 bool vlans_changed; /* True if new VLANs are in use. */
83 struct ofproto *ofproto_lookup(const char *name);
84 struct ofport *ofproto_get_port(const struct ofproto *, uint16_t ofp_port);
86 /* Assigns CLS to each classifier table, in turn, in OFPROTO.
88 * All parameters are evaluated multiple times. */
89 #define OFPROTO_FOR_EACH_TABLE(CLS, OFPROTO) \
90 for ((CLS) = (OFPROTO)->tables; \
91 (CLS) < &(OFPROTO)->tables[(OFPROTO)->n_tables]; \
94 /* An OpenFlow port within a "struct ofproto".
96 * With few exceptions, ofproto implementations may look at these fields but
97 * should not modify them. */
99 struct ofproto *ofproto; /* The ofproto that contains this port. */
100 struct hmap_node hmap_node; /* In struct ofproto's "ports" hmap. */
101 struct netdev *netdev;
102 struct ofp_phy_port opp;
103 uint16_t ofp_port; /* OpenFlow port number. */
104 unsigned int change_seq;
108 void ofproto_port_set_state(struct ofport *, ovs_be32 state);
110 /* An OpenFlow flow within a "struct ofproto".
112 * With few exceptions, ofproto implementations may look at these fields but
113 * should not modify them. */
115 struct ofproto *ofproto; /* The ofproto that contains this rule. */
116 struct list ofproto_node; /* Owned by ofproto base code. */
117 struct cls_rule cr; /* In owning ofproto's classifier. */
119 struct ofoperation *pending; /* Operation now in progress, if nonnull. */
121 ovs_be64 flow_cookie; /* Controller-issued identifier. */
123 long long int created; /* Creation time. */
124 long long int modified; /* Time of last modification. */
125 uint16_t idle_timeout; /* In seconds from time of last use. */
126 uint16_t hard_timeout; /* In seconds from last modification. */
127 uint8_t table_id; /* Index in ofproto's 'tables' array. */
128 bool send_flow_removed; /* Send a flow removed message? */
130 union ofp_action *actions; /* OpenFlow actions. */
131 int n_actions; /* Number of elements in actions[]. */
134 static inline struct rule *
135 rule_from_cls_rule(const struct cls_rule *cls_rule)
137 return cls_rule ? CONTAINER_OF(cls_rule, struct rule, cr) : NULL;
140 void ofproto_rule_expire(struct rule *, uint8_t reason);
141 void ofproto_rule_destroy(struct rule *);
143 void ofoperation_complete(struct ofoperation *, int status);
144 struct rule *ofoperation_get_victim(struct ofoperation *);
146 /* ofproto class structure, to be defined by each ofproto implementation.
152 * These functions work primarily with three different kinds of data
155 * - "struct ofproto", which represents an OpenFlow switch.
157 * - "struct ofport", which represents a port within an ofproto.
159 * - "struct rule", which represents an OpenFlow flow within an ofproto.
161 * Each of these data structures contains all of the implementation-independent
162 * generic state for the respective concept, called the "base" state. None of
163 * them contains any extra space for ofproto implementations to use. Instead,
164 * each implementation is expected to declare its own data structure that
165 * contains an instance of the generic data structure plus additional
166 * implementation-specific members, called the "derived" state. The
167 * implementation can use casts or (preferably) the CONTAINER_OF macro to
168 * obtain access to derived state given only a pointer to the embedded generic
175 * Four stylized functions accompany each of these data structures:
177 * "alloc" "construct" "destruct" "dealloc"
178 * ------------ ---------------- --------------- --------------
179 * ofproto ->alloc ->construct ->destruct ->dealloc
180 * ofport ->port_alloc ->port_construct ->port_destruct ->port_dealloc
181 * rule ->rule_alloc ->rule_construct ->rule_destruct ->rule_dealloc
183 * Any instance of a given data structure goes through the following life
186 * 1. The client calls the "alloc" function to obtain raw memory. If "alloc"
187 * fails, skip all the other steps.
189 * 2. The client initializes all of the data structure's base state. If this
190 * fails, skip to step 7.
192 * 3. The client calls the "construct" function. The implementation
193 * initializes derived state. It may refer to the already-initialized
194 * base state. If "construct" fails, skip to step 6.
196 * 4. The data structure is now initialized and in use.
198 * 5. When the data structure is no longer needed, the client calls the
199 * "destruct" function. The implementation uninitializes derived state.
200 * The base state has not been uninitialized yet, so the implementation
201 * may still refer to it.
203 * 6. The client uninitializes all of the data structure's base state.
205 * 7. The client calls the "dealloc" to free the raw memory. The
206 * implementation must not refer to base or derived state in the data
207 * structure, because it has already been uninitialized.
209 * Each "alloc" function allocates and returns a new instance of the respective
210 * data structure. The "alloc" function is not given any information about the
211 * use of the new data structure, so it cannot perform much initialization.
212 * Its purpose is just to ensure that the new data structure has enough room
213 * for base and derived state. It may return a null pointer if memory is not
214 * available, in which case none of the other functions is called.
216 * Each "construct" function initializes derived state in its respective data
217 * structure. When "construct" is called, all of the base state has already
218 * been initialized, so the "construct" function may refer to it. The
219 * "construct" function is allowed to fail, in which case the client calls the
220 * "dealloc" function (but not the "destruct" function).
222 * Each "destruct" function uninitializes and frees derived state in its
223 * respective data structure. When "destruct" is called, the base state has
224 * not yet been uninitialized, so the "destruct" function may refer to it. The
225 * "destruct" function is not allowed to fail.
227 * Each "dealloc" function frees raw memory that was allocated by the the
228 * "alloc" function. The memory's base and derived members might not have ever
229 * been initialized (but if "construct" returned successfully, then it has been
230 * "destruct"ed already). The "dealloc" function is not allowed to fail.
236 * Most of these functions return 0 if they are successful or a positive error
237 * code on failure. Depending on the function, valid error codes are either
238 * errno values or OpenFlow error codes constructed with ofp_mkerr().
240 * Most of these functions are expected to execute synchronously, that is, to
241 * block as necessary to obtain a result. Thus, these functions may return
242 * EAGAIN (or EWOULDBLOCK or EINPROGRESS) only where the function descriptions
243 * explicitly say those errors are a possibility. We may relax this
244 * requirement in the future if and when we encounter performance problems. */
245 struct ofproto_class {
246 /* ## ----------------- ## */
247 /* ## Factory Functions ## */
248 /* ## ----------------- ## */
250 /* Enumerates the types of all support ofproto types into 'types'. The
251 * caller has already initialized 'types' and other ofproto classes might
252 * already have added names to it. */
253 void (*enumerate_types)(struct sset *types);
255 /* Enumerates the names of all existing datapath of the specified 'type'
256 * into 'names' 'all_dps'. The caller has already initialized 'names' as
259 * 'type' is one of the types enumerated by ->enumerate_types().
261 * Returns 0 if successful, otherwise a positive errno value.
263 int (*enumerate_names)(const char *type, struct sset *names);
265 /* Deletes the datapath with the specified 'type' and 'name'. The caller
266 * should have closed any open ofproto with this 'type' and 'name'; this
267 * function is allowed to fail if that is not the case.
269 * 'type' is one of the types enumerated by ->enumerate_types().
270 * 'name' is one of the names enumerated by ->enumerate_names() for 'type'.
272 * Returns 0 if successful, otherwise a positive errno value.
274 int (*del)(const char *type, const char *name);
276 /* ## --------------------------- ## */
277 /* ## Top-Level ofproto Functions ## */
278 /* ## --------------------------- ## */
280 /* Life-cycle functions for an "ofproto" (see "Life Cycle" above).
286 * ->construct() should not modify any base members of the ofproto. The
287 * client will initialize the ofproto's 'ports' and 'tables' members after
288 * construction is complete.
290 * When ->construct() is called, the client does not yet know how many flow
291 * tables the datapath supports, so ofproto->n_tables will be 0 and
292 * ofproto->tables will be NULL. ->construct() should store the number of
293 * flow tables supported by the datapath (between 1 and 255, inclusive)
294 * into '*n_tables'. After a successful return, the client will initialize
295 * the base 'n_tables' member to '*n_tables' and allocate and initialize
296 * the base 'tables' member as the specified number of empty flow tables.
297 * Each flow table will be initially empty, so ->construct() should delete
298 * flows from the underlying datapath, if necessary, rather than populating
301 * Only one ofproto instance needs to be supported for any given datapath.
302 * If a datapath is already open as part of one "ofproto", then another
303 * attempt to "construct" the same datapath as part of another ofproto is
304 * allowed to fail with an error.
306 * ->construct() returns 0 if successful, otherwise a positive errno
313 * If 'ofproto' has any pending asynchronous operations, ->destruct()
314 * must complete all of them by calling ofoperation_complete().
316 * ->destruct() must also destroy all remaining rules in the ofproto's
317 * tables, by passing each remaining rule to ofproto_rule_destroy(). The
318 * client will destroy the flow tables themselves after ->destruct()
321 struct ofproto *(*alloc)(void);
322 int (*construct)(struct ofproto *ofproto, int *n_tables);
323 void (*destruct)(struct ofproto *ofproto);
324 void (*dealloc)(struct ofproto *ofproto);
326 /* Performs any periodic activity required by 'ofproto'. It should:
328 * - Call connmgr_send_packet_in() for each received packet that missed
329 * in the OpenFlow flow table or that had a OFPP_CONTROLLER output
332 * - Call ofproto_rule_expire() for each OpenFlow flow that has reached
333 * its hard_timeout or idle_timeout, to expire the flow.
335 * Returns 0 if successful, otherwise a positive errno value. The ENODEV
336 * return value specifically means that the datapath underlying 'ofproto'
337 * has been destroyed (externally, e.g. by an admin running ovs-dpctl).
339 int (*run)(struct ofproto *ofproto);
341 /* Causes the poll loop to wake up when 'ofproto''s 'run' function needs to
342 * be called, e.g. by calling the timer or fd waiting functions in
344 void (*wait)(struct ofproto *ofproto);
346 /* Every "struct rule" in 'ofproto' is about to be deleted, one by one.
347 * This function may prepare for that, for example by clearing state in
348 * advance. It should *not* actually delete any "struct rule"s from
349 * 'ofproto', only prepare for it.
351 * This function is optional; it's really just for optimization in case
352 * it's cheaper to delete all the flows from your hardware in a single pass
353 * than to do it one by one. */
354 void (*flush)(struct ofproto *ofproto);
356 /* Helper for the OpenFlow OFPT_FEATURES_REQUEST request.
358 * The implementation should store true in '*arp_match_ip' if the switch
359 * supports matching IP addresses inside ARP requests and replies, false
362 * The implementation should store in '*actions' a bitmap of the supported
363 * OpenFlow actions: the bit with value (1 << n) should be set to 1 if the
364 * implementation supports the action with value 'n', and to 0 otherwise.
365 * For example, if the implementation supports the OFPAT_OUTPUT and
366 * OFPAT_ENQUEUE actions, but no others, it would set '*actions' to (1 <<
367 * OFPAT_OUTPUT) | (1 << OFPAT_ENQUEUE). Vendor actions are not included
369 void (*get_features)(struct ofproto *ofproto,
370 bool *arp_match_ip, uint32_t *actions);
372 /* Helper for the OpenFlow OFPST_TABLE statistics request.
374 * The 'ots' array contains 'ofproto->n_tables' elements. Each element is
377 * - 'table_id' to the array index.
379 * - 'name' to "table#" where # is the table ID.
381 * - 'wildcards' to OFPFW_ALL.
383 * - 'max_entries' to 1,000,000.
385 * - 'active_count' to the classifier_count() for the table.
387 * - 'lookup_count' and 'matched_count' to 0.
389 * The implementation should update any members in each element for which
390 * it has better values:
392 * - 'name' to a more meaningful name.
394 * - 'wildcards' to the set of wildcards actually supported by the table
395 * (if it doesn't support all OpenFlow wildcards).
397 * - 'max_entries' to the maximum number of flows actually supported by
400 * - 'lookup_count' to the number of packets looked up in this flow table
403 * - 'matched_count' to the number of packets looked up in this flow
404 * table so far that matched one of the flow entries.
406 * Keep in mind that all of the members of struct ofp_table_stats are in
407 * network byte order.
409 void (*get_tables)(struct ofproto *ofproto, struct ofp_table_stats *ots);
411 /* ## ---------------- ## */
412 /* ## ofport Functions ## */
413 /* ## ---------------- ## */
415 /* Life-cycle functions for a "struct ofport" (see "Life Cycle" above).
417 * ->port_construct() should not modify any base members of the ofport.
419 * ofports are managed by the base ofproto code. The ofproto
420 * implementation should only create and destroy them in response to calls
421 * to these functions. The base ofproto code will create and destroy
422 * ofports in the following situations:
424 * - Just after the ->construct() function is called, the base ofproto
425 * iterates over all of the implementation's ports, using
426 * ->port_dump_start() and related functions, and constructs an ofport
427 * for each dumped port.
429 * - If ->port_poll() reports that a specific port has changed, then the
430 * base ofproto will query that port with ->port_query_by_name() and
431 * construct or destruct ofports as necessary to reflect the updated
434 * - If ->port_poll() returns ENOBUFS to report an unspecified port set
435 * change, then the base ofproto will iterate over all of the
436 * implementation's ports, in the same way as at ofproto
437 * initialization, and construct and destruct ofports to reflect all of
440 * ->port_construct() returns 0 if successful, otherwise a positive errno
443 struct ofport *(*port_alloc)(void);
444 int (*port_construct)(struct ofport *ofport);
445 void (*port_destruct)(struct ofport *ofport);
446 void (*port_dealloc)(struct ofport *ofport);
448 /* Called after 'ofport->netdev' is replaced by a new netdev object. If
449 * the ofproto implementation uses the ofport's netdev internally, then it
450 * should switch to using the new one. The old one has been closed.
452 * An ofproto implementation that doesn't need to do anything in this
453 * function may use a null pointer. */
454 void (*port_modified)(struct ofport *ofport);
456 /* Called after an OpenFlow OFPT_PORT_MOD request changes a port's
457 * configuration. 'ofport->opp.config' contains the new configuration.
458 * 'old_config' contains the previous configuration.
460 * The caller implements OFPPC_PORT_DOWN using netdev functions to turn
461 * NETDEV_UP on and off, so this function doesn't have to do anything for
462 * that bit (and it won't be called if that is the only bit that
464 void (*port_reconfigured)(struct ofport *ofport, ovs_be32 old_config);
466 /* Looks up a port named 'devname' in 'ofproto'. On success, initializes
467 * '*port' appropriately.
469 * The caller owns the data in 'port' and must free it with
470 * ofproto_port_destroy() when it is no longer needed. */
471 int (*port_query_by_name)(const struct ofproto *ofproto,
472 const char *devname, struct ofproto_port *port);
474 /* Attempts to add 'netdev' as a port on 'ofproto'. Returns 0 if
475 * successful, otherwise a positive errno value. If successful, sets
476 * '*ofp_portp' to the new port's port number.
478 * It doesn't matter whether the new port will be returned by a later call
479 * to ->port_poll(); the implementation may do whatever is more
481 int (*port_add)(struct ofproto *ofproto, struct netdev *netdev,
482 uint16_t *ofp_portp);
484 /* Deletes port number 'ofp_port' from the datapath for 'ofproto'. Returns
485 * 0 if successful, otherwise a positive errno value.
487 * It doesn't matter whether the new port will be returned by a later call
488 * to ->port_poll(); the implementation may do whatever is more
490 int (*port_del)(struct ofproto *ofproto, uint16_t ofp_port);
492 /* Port iteration functions.
494 * The client might not be entirely in control of the ports within an
495 * ofproto. Some hardware implementations, for example, might have a fixed
496 * set of ports in a datapath, and the Linux datapath allows the system
497 * administrator to externally add and remove ports with ovs-dpctl. For
498 * this reason, the client needs a way to iterate through all the ports
499 * that are actually in a datapath. These functions provide that
502 * The 'state' pointer provides the implementation a place to
503 * keep track of its position. Its format is opaque to the caller.
505 * The ofproto provider retains ownership of the data that it stores into
506 * ->port_dump_next()'s 'port' argument. The data must remain valid until
507 * at least the next call to ->port_dump_next() or ->port_dump_done() for
508 * 'state'. The caller will not modify or free it.
513 * ->port_dump_start() attempts to begin dumping the ports in 'ofproto'.
514 * On success, it should return 0 and initialize '*statep' with any data
515 * needed for iteration. On failure, returns a positive errno value, and
516 * the client will not call ->port_dump_next() or ->port_dump_done().
518 * ->port_dump_next() attempts to retrieve another port from 'ofproto' for
519 * 'state'. If there is another port, it should store the port's
520 * information into 'port' and return 0. It should return EOF if all ports
521 * have already been iterated. Otherwise, on error, it should return a
522 * positive errno value. This function will not be called again once it
523 * returns nonzero once for a given iteration (but the 'port_dump_done'
524 * function will be called afterward).
526 * ->port_dump_done() allows the implementation to release resources used
527 * for iteration. The caller might decide to stop iteration in the middle
528 * by calling this function before ->port_dump_next() returns nonzero.
536 * error = ofproto->ofproto_class->port_dump_start(ofproto, &state);
539 * struct ofproto_port port;
541 * error = ofproto->ofproto_class->port_dump_next(
542 * ofproto, state, &port);
546 * // Do something with 'port' here (without modifying or freeing
547 * // any of its data).
549 * ofproto->ofproto_class->port_dump_done(ofproto, state);
551 * // 'error' is now EOF (success) or a positive errno value (failure).
553 int (*port_dump_start)(const struct ofproto *ofproto, void **statep);
554 int (*port_dump_next)(const struct ofproto *ofproto, void *state,
555 struct ofproto_port *port);
556 int (*port_dump_done)(const struct ofproto *ofproto, void *state);
558 /* Polls for changes in the set of ports in 'ofproto'. If the set of ports
559 * in 'ofproto' has changed, then this function should do one of the
562 * - Preferably: store the name of the device that was added to or deleted
563 * from 'ofproto' in '*devnamep' and return 0. The caller is responsible
564 * for freeing '*devnamep' (with free()) when it no longer needs it.
566 * - Alternatively: return ENOBUFS, without indicating the device that was
569 * Occasional 'false positives', in which the function returns 0 while
570 * indicating a device that was not actually added or deleted or returns
571 * ENOBUFS without any change, are acceptable.
573 * The purpose of 'port_poll' is to let 'ofproto' know about changes made
574 * externally to the 'ofproto' object, e.g. by a system administrator via
575 * ovs-dpctl. Therefore, it's OK, and even preferable, for port_poll() to
576 * not report changes made through calls to 'port_add' or 'port_del' on the
577 * same 'ofproto' object. (But it's OK for it to report them too, just
578 * slightly less efficient.)
580 * If the set of ports in 'ofproto' has not changed, returns EAGAIN. May
581 * also return other positive errno values to indicate that something has
584 * If the set of ports in a datapath is fixed, or if the only way that the
585 * set of ports in a datapath can change is through ->port_add() and
586 * ->port_del(), then this function may be a null pointer.
588 int (*port_poll)(const struct ofproto *ofproto, char **devnamep);
590 /* Arranges for the poll loop to wake up when ->port_poll() will return a
591 * value other than EAGAIN.
593 * If the set of ports in a datapath is fixed, or if the only way that the
594 * set of ports in a datapath can change is through ->port_add() and
595 * ->port_del(), or if the poll loop will always wake up anyway when
596 * ->port_poll() will return a value other than EAGAIN, then this function
597 * may be a null pointer.
599 void (*port_poll_wait)(const struct ofproto *ofproto);
601 /* Checks the status of LACP negotiation for 'port'. Returns 1 if LACP
602 * partner information for 'port' is up-to-date, 0 if LACP partner
603 * information is not current (generally indicating a connectivity
604 * problem), or -1 if LACP is not enabled on 'port'.
606 * This function may be a null pointer if the ofproto implementation does
607 * not support LACP. */
608 int (*port_is_lacp_current)(const struct ofport *port);
610 /* ## ----------------------- ## */
611 /* ## OpenFlow Rule Functions ## */
612 /* ## ----------------------- ## */
616 /* Chooses an appropriate table for 'cls_rule' within 'ofproto'. On
617 * success, stores the table ID into '*table_idp' and returns 0. On
618 * failure, returns an OpenFlow error code (as returned by ofp_mkerr()).
620 * The choice of table should be a function of 'cls_rule' and 'ofproto''s
621 * datapath capabilities. It should not depend on the flows already in
622 * 'ofproto''s flow tables. Failure implies that an OpenFlow rule with
623 * 'cls_rule' as its matching condition can never be inserted into
624 * 'ofproto', even starting from an empty flow table.
626 * If multiple tables are candidates for inserting the flow, the function
627 * should choose one arbitrarily (but deterministically).
629 * If this function is NULL then table 0 is always chosen. */
630 int (*rule_choose_table)(const struct ofproto *ofproto,
631 const struct cls_rule *cls_rule,
634 /* Life-cycle functions for a "struct rule" (see "Life Cycle" above).
637 * Asynchronous Operation Support
638 * ==============================
640 * The life-cycle operations on rules can operate asynchronously, meaning
641 * that ->rule_construct() and ->rule_destruct() only need to initiate
642 * their respective operations and do not need to wait for them to complete
643 * before they return. ->rule_modify_actions() also operates
646 * An ofproto implementation reports the success or failure of an
647 * asynchronous operation on a rule using the rule's 'pending' member,
648 * which points to a opaque "struct ofoperation" that represents the
649 * ongoing opreation. When the operation completes, the ofproto
650 * implementation calls ofoperation_complete(), passing the ofoperation and
651 * an error indication.
653 * Only the following contexts may call ofoperation_complete():
655 * - The function called to initiate the operation,
656 * e.g. ->rule_construct() or ->rule_destruct(). This is the best
657 * choice if the operation completes quickly.
659 * - The implementation's ->run() function.
661 * - The implementation's ->destruct() function.
663 * The ofproto base code updates the flow table optimistically, assuming
664 * that the operation will probably succeed:
666 * - ofproto adds or replaces the rule in the flow table before calling
667 * ->rule_construct().
669 * - ofproto updates the rule's actions before calling
670 * ->rule_modify_actions().
672 * - ofproto removes the rule before calling ->rule_destruct().
674 * With one exception, when an asynchronous operation completes with an
675 * error, ofoperation_complete() backs out the already applied changes:
677 * - If adding or replacing a rule in the flow table fails, ofproto
678 * removes the new rule or restores the original rule.
680 * - If modifying a rule's actions fails, ofproto restores the original
683 * - Removing a rule is not allowed to fail. It must always succeed.
685 * The ofproto base code serializes operations: if any operation is in
686 * progress on a given rule, ofproto postpones initiating any new operation
687 * on that rule until the pending operation completes. Therefore, every
688 * operation must eventually complete through a call to
689 * ofoperation_complete() to avoid delaying new operations indefinitely
690 * (including any OpenFlow request that affects the rule in question, even
691 * just to query its statistics).
697 * When ->rule_construct() is called, the caller has already inserted
698 * 'rule' into 'rule->ofproto''s flow table numbered 'rule->table_id'.
699 * There are two cases:
701 * - 'rule' is a new rule in its flow table. In this case,
702 * ofoperation_get_victim(rule) returns NULL.
704 * - 'rule' is replacing an existing rule in its flow table that had the
705 * same matching criteria and priority. In this case,
706 * ofoperation_get_victim(rule) returns the rule being replaced (the
709 * ->rule_construct() should set the following in motion:
711 * - Validate that the matching rule in 'rule->cr' is supported by the
712 * datapath. For example, if the rule's table does not support
713 * registers, then it is an error if 'rule->cr' does not wildcard all
716 * - Validate that 'rule->actions' and 'rule->n_actions' are well-formed
717 * OpenFlow actions that the datapath can correctly implement. The
718 * validate_actions() function (in ofp-util.c) can be useful as a model
719 * for action validation, but it accepts all of the OpenFlow actions
720 * that OVS understands. If your ofproto implementation only
721 * implements a subset of those, then you should implement your own
724 * - If the rule is valid, update the datapath flow table, adding the new
725 * rule or replacing the existing one.
727 * - If 'rule' is replacing an existing rule, uninitialize any derived
728 * state for the victim rule, as in step 5 in the "Life Cycle"
731 * (On failure, the ofproto code will roll back the insertion from the flow
732 * table, either removing 'rule' or replacing it by the victim rule if
735 * ->rule_construct() must act in one of the following ways:
737 * - If it succeeds, it must call ofoperation_complete() and return 0.
739 * - If it fails, it must act in one of the following ways:
741 * * Call ofoperation_complete() and return 0.
743 * * Return an OpenFlow error code (as returned by ofp_mkerr()). (Do
744 * not call ofoperation_complete() in this case.)
746 * Either way, ->rule_destruct() will not be called for 'rule', but
747 * ->rule_dealloc() will be.
749 * - If the operation is only partially complete, then it must return 0.
750 * Later, when the operation is complete, the ->run() or ->destruct()
751 * function must call ofoperation_complete() to report success or
754 * ->rule_construct() should not modify any base members of struct rule.
760 * When ->rule_destruct() is called, the caller has already removed 'rule'
761 * from 'rule->ofproto''s flow table. ->rule_destruct() should set in
762 * motion removing 'rule' from the datapath flow table. If removal
763 * completes synchronously, it should call ofoperation_complete().
764 * Otherwise, the ->run() or ->destruct() function must later call
765 * ofoperation_complete() after the operation completes.
767 * Rule destruction must not fail. */
768 struct rule *(*rule_alloc)(void);
769 int (*rule_construct)(struct rule *rule);
770 void (*rule_destruct)(struct rule *rule);
771 void (*rule_dealloc)(struct rule *rule);
773 /* Obtains statistics for 'rule', storing the number of packets that have
774 * matched it in '*packet_count' and the number of bytes in those packets
775 * in '*byte_count'. UINT64_MAX indicates that the packet count or byte
776 * count is unknown. */
777 void (*rule_get_stats)(struct rule *rule, uint64_t *packet_count,
778 uint64_t *byte_count);
780 /* Applies the actions in 'rule' to 'packet'. (This implements sending
781 * buffered packets for OpenFlow OFPT_FLOW_MOD commands.)
783 * Takes ownership of 'packet' (so it should eventually free it, with
786 * 'flow' reflects the flow information for 'packet'. All of the
787 * information in 'flow' is extracted from 'packet', except for
788 * flow->tun_id and flow->in_port, which are assigned the correct values
789 * for the incoming packet. The register values are zeroed.
791 * The statistics for 'packet' should be included in 'rule'.
793 * Returns 0 if successful, otherwise an OpenFlow error code (as returned
794 * by ofp_mkerr()). */
795 int (*rule_execute)(struct rule *rule, const struct flow *flow,
796 struct ofpbuf *packet);
798 /* When ->rule_modify_actions() is called, the caller has already replaced
799 * the OpenFlow actions in 'rule' by a new set. (The original actions are
800 * in rule->pending->actions.)
802 * ->rule_modify_actions() should set the following in motion:
804 * - Validate that the actions now in 'rule' are well-formed OpenFlow
805 * actions that the datapath can correctly implement.
807 * - Update the datapath flow table with the new actions.
809 * If the operation synchronously completes, ->rule_modify_actions() may
810 * call ofoperation_complete() before it returns. Otherwise, ->run()
811 * should call ofoperation_complete() later, after the operation does
814 * If the operation fails, then the base ofproto code will restore the
815 * original 'actions' and 'n_actions' of 'rule'.
817 * ->rule_modify_actions() should not modify any base members of struct
819 void (*rule_modify_actions)(struct rule *rule);
821 /* Changes the OpenFlow IP fragment handling policy to 'frag_handling',
822 * which takes one of the following values, with the corresponding
825 * - OFPC_FRAG_NORMAL: The switch should treat IP fragments the same way
826 * as other packets, omitting TCP and UDP port numbers (always setting
829 * - OFPC_FRAG_DROP: The switch should drop all IP fragments without
830 * passing them through the flow table.
832 * - OFPC_FRAG_REASM: The switch should reassemble IP fragments before
833 * passing packets through the flow table.
835 * - OFPC_FRAG_NX_MATCH (a Nicira extension): Similar to OFPC_FRAG_NORMAL,
836 * except that TCP and UDP port numbers should be included in fragments
839 * Implementations are not required to support every mode.
840 * OFPC_FRAG_NORMAL is the default mode when an ofproto is created.
842 * At the time of the call to ->set_frag_handling(), the current mode is
843 * available in 'ofproto->frag_handling'. ->set_frag_handling() returns
844 * true if the requested mode was set, false if it is not supported.
846 * Upon successful return, the caller changes 'ofproto->frag_handling' to
847 * reflect the new mode.
849 bool (*set_frag_handling)(struct ofproto *ofproto,
850 enum ofp_config_flags frag_handling);
852 /* Implements the OpenFlow OFPT_PACKET_OUT command. The datapath should
853 * execute the 'n_actions' in the 'actions' array on 'packet'.
855 * The caller retains ownership of 'packet', so ->packet_out() should not
858 * This function must validate that the 'n_actions' elements in 'actions'
859 * are well-formed OpenFlow actions that can be correctly implemented by
860 * the datapath. If not, then it should return an OpenFlow error code (as
861 * returned by ofp_mkerr()).
863 * 'flow' reflects the flow information for 'packet'. All of the
864 * information in 'flow' is extracted from 'packet', except for
865 * flow->in_port, which is taken from the OFPT_PACKET_OUT message.
866 * flow->tun_id and its register values are zeroed.
868 * 'packet' is not matched against the OpenFlow flow table, so its
869 * statistics should not be included in OpenFlow flow statistics.
871 * Returns 0 if successful, otherwise an OpenFlow error code (as returned
872 * by ofp_mkerr()). */
873 int (*packet_out)(struct ofproto *ofproto, struct ofpbuf *packet,
874 const struct flow *flow,
875 const union ofp_action *actions,
878 /* ## ------------------------- ## */
879 /* ## OFPP_NORMAL configuration ## */
880 /* ## ------------------------- ## */
882 /* Configures NetFlow on 'ofproto' according to the options in
883 * 'netflow_options', or turns off NetFlow if 'netflow_options' is NULL.
885 * EOPNOTSUPP as a return value indicates that 'ofproto' does not support
886 * NetFlow, as does a null pointer. */
887 int (*set_netflow)(struct ofproto *ofproto,
888 const struct netflow_options *netflow_options);
890 void (*get_netflow_ids)(const struct ofproto *ofproto,
891 uint8_t *engine_type, uint8_t *engine_id);
893 /* Configures sFlow on 'ofproto' according to the options in
894 * 'sflow_options', or turns off sFlow if 'sflow_options' is NULL.
896 * EOPNOTSUPP as a return value indicates that 'ofproto' does not support
897 * sFlow, as does a null pointer. */
898 int (*set_sflow)(struct ofproto *ofproto,
899 const struct ofproto_sflow_options *sflow_options);
901 /* Configures connectivity fault management on 'ofport'.
903 * If 'cfm_settings' is nonnull, configures CFM according to its members.
905 * If 'cfm_settings' is null, removes any connectivity fault management
906 * configuration from 'ofport'.
908 * EOPNOTSUPP as a return value indicates that this ofproto_class does not
909 * support CFM, as does a null pointer. */
910 int (*set_cfm)(struct ofport *ofport, const struct cfm_settings *s);
912 /* Checks the fault status of CFM configured on 'ofport'. Returns 1 if CFM
913 * is faulted (generally indicating a connectivity problem), 0 if CFM is
914 * not faulted, or -1 if CFM is not enabled on 'port'
916 * This function may be a null pointer if the ofproto implementation does
917 * not support CFM. */
918 int (*get_cfm_fault)(const struct ofport *ofport);
920 /* Gets the MPIDs of the remote maintenance points broadcasting to
921 * 'ofport'. Populates 'rmps' with a provider owned array of MPIDs, and
922 * 'n_rmps' with the number of MPIDs in 'rmps'. Returns a number less than
923 * 0 if CFM is not enabled of 'ofport'.
925 * This function may be a null pointer if the ofproto implementation does
926 * not support CFM. */
927 int (*get_cfm_remote_mpids)(const struct ofport *ofport,
928 const uint64_t **rmps, size_t *n_rmps);
930 /* Configures spanning tree protocol (STP) on 'ofproto' using the
931 * settings defined in 's'.
933 * If 's' is nonnull, configures STP according to its members.
935 * If 's' is null, removes any STP configuration from 'ofproto'.
937 * EOPNOTSUPP as a return value indicates that this ofproto_class does not
938 * support STP, as does a null pointer. */
939 int (*set_stp)(struct ofproto *ofproto,
940 const struct ofproto_stp_settings *s);
942 /* Retrieves state of spanning tree protocol (STP) on 'ofproto'.
944 * Stores STP state for 'ofproto' in 's'. If the 'enabled' member
945 * is false, the other member values are not meaningful.
947 * EOPNOTSUPP as a return value indicates that this ofproto_class does not
948 * support STP, as does a null pointer. */
949 int (*get_stp_status)(struct ofproto *ofproto,
950 struct ofproto_stp_status *s);
952 /* Configures spanning tree protocol (STP) on 'ofport' using the
953 * settings defined in 's'.
955 * If 's' is nonnull, configures STP according to its members. The
956 * caller is responsible for assigning STP port numbers (using the
957 * 'port_num' member in the range of 1 through 255, inclusive) and
958 * ensuring there are no duplicates.
960 * If 's' is null, removes any STP configuration from 'ofport'.
962 * EOPNOTSUPP as a return value indicates that this ofproto_class does not
963 * support STP, as does a null pointer. */
964 int (*set_stp_port)(struct ofport *ofport,
965 const struct ofproto_port_stp_settings *s);
967 /* Retrieves spanning tree protocol (STP) port status of 'ofport'.
969 * Stores STP state for 'ofport' in 's'. If the 'enabled' member is
970 * false, the other member values are not meaningful.
972 * EOPNOTSUPP as a return value indicates that this ofproto_class does not
973 * support STP, as does a null pointer. */
974 int (*get_stp_port_status)(struct ofport *ofport,
975 struct ofproto_port_stp_status *s);
977 /* Registers meta-data associated with the 'n_qdscp' Qualities of Service
978 * 'queues' attached to 'ofport'. This data is not intended to be
979 * sufficient to implement QoS. Instead, providers may use this
980 * information to implement features which require knowledge of what queues
981 * exist on a port, and some basic information about them.
983 * EOPNOTSUPP as a return value indicates that this ofproto_class does not
984 * support QoS, as does a null pointer. */
985 int (*set_queues)(struct ofport *ofport,
986 const struct ofproto_port_queue *queues, size_t n_qdscp);
988 /* If 's' is nonnull, this function registers a "bundle" associated with
989 * client data pointer 'aux' in 'ofproto'. A bundle is the same concept as
990 * a Port in OVSDB, that is, it consists of one or more "slave" devices
991 * (Interfaces, in OVSDB) along with VLAN and LACP configuration and, if
992 * there is more than one slave, a bonding configuration. If 'aux' is
993 * already registered then this function updates its configuration to 's'.
994 * Otherwise, this function registers a new bundle.
996 * If 's' is NULL, this function unregisters the bundle registered on
997 * 'ofproto' associated with client data pointer 'aux'. If no such bundle
998 * has been registered, this has no effect.
1000 * This function affects only the behavior of the NXAST_AUTOPATH action and
1001 * output to the OFPP_NORMAL port. An implementation that does not support
1002 * it at all may set it to NULL or return EOPNOTSUPP. An implementation
1003 * that supports only a subset of the functionality should implement what
1004 * it can and return 0. */
1005 int (*bundle_set)(struct ofproto *ofproto, void *aux,
1006 const struct ofproto_bundle_settings *s);
1008 /* If 'port' is part of any bundle, removes it from that bundle. If the
1009 * bundle now has no ports, deletes the bundle. If the bundle now has only
1010 * one port, deconfigures the bundle's bonding configuration. */
1011 void (*bundle_remove)(struct ofport *ofport);
1013 /* If 's' is nonnull, this function registers a mirror associated with
1014 * client data pointer 'aux' in 'ofproto'. A mirror is the same concept as
1015 * a Mirror in OVSDB. If 'aux' is already registered then this function
1016 * updates its configuration to 's'. Otherwise, this function registers a
1019 * If 's' is NULL, this function unregisters the mirror registered on
1020 * 'ofproto' associated with client data pointer 'aux'. If no such mirror
1021 * has been registered, this has no effect.
1023 * This function affects only the behavior of the OFPP_NORMAL action. An
1024 * implementation that does not support it at all may set it to NULL or
1025 * return EOPNOTSUPP. An implementation that supports only a subset of the
1026 * functionality should implement what it can and return 0. */
1027 int (*mirror_set)(struct ofproto *ofproto, void *aux,
1028 const struct ofproto_mirror_settings *s);
1030 /* Configures the VLANs whose bits are set to 1 in 'flood_vlans' as VLANs
1031 * on which all packets are flooded, instead of using MAC learning. If
1032 * 'flood_vlans' is NULL, then MAC learning applies to all VLANs.
1034 * This function affects only the behavior of the OFPP_NORMAL action. An
1035 * implementation that does not support it may set it to NULL or return
1037 int (*set_flood_vlans)(struct ofproto *ofproto,
1038 unsigned long *flood_vlans);
1040 /* Returns true if 'aux' is a registered bundle that is currently in use as
1041 * the output for a mirror. */
1042 bool (*is_mirror_output_bundle)(const struct ofproto *ofproto, void *aux);
1044 /* When the configuration option of forward_bpdu changes, this function
1045 * will be invoked. */
1046 void (*forward_bpdu_changed)(struct ofproto *ofproto);
1048 /* Linux VLAN device support (e.g. "eth0.10" for VLAN 10.)
1050 * This is deprecated. It is only for compatibility with broken device drivers
1051 * in old versions of Linux that do not properly support VLANs when VLAN
1052 * devices are not used. When broken device drivers are no longer in
1053 * widespread use, we will delete these interfaces. */
1055 /* If 'realdev_ofp_port' is nonzero, then this function configures 'ofport'
1056 * as a VLAN splinter port for VLAN 'vid', associated with the real device
1057 * that has OpenFlow port number 'realdev_ofp_port'.
1059 * If 'realdev_ofp_port' is zero, then this function deconfigures 'ofport'
1060 * as a VLAN splinter port.
1062 * This function should be NULL if a an implementation does not support
1064 int (*set_realdev)(struct ofport *ofport,
1065 uint16_t realdev_ofp_port, int vid);
1068 extern const struct ofproto_class ofproto_dpif_class;
1070 int ofproto_class_register(const struct ofproto_class *);
1071 int ofproto_class_unregister(const struct ofproto_class *);
1073 /* ofproto_flow_mod() returns this value if the flow_mod could not be processed
1074 * because it overlaps with an ongoing flow table operation that has not yet
1075 * completed. The caller should retry the operation later.
1077 * ofproto.c also uses this value internally for additional (similar) purposes.
1079 * This particular value is a good choice because it is negative (so it won't
1080 * collide with any errno value or any value returned by ofp_mkerr()) and large
1081 * (so it won't accidentally collide with EOF or a negative errno value). */
1082 enum { OFPROTO_POSTPONE = -100000 };
1084 int ofproto_flow_mod(struct ofproto *, const struct ofputil_flow_mod *);
1085 void ofproto_add_flow(struct ofproto *, const struct cls_rule *,
1086 const union ofp_action *, size_t n_actions);
1087 bool ofproto_delete_flow(struct ofproto *, const struct cls_rule *);
1088 void ofproto_flush_flows(struct ofproto *);
1090 #endif /* ofproto/ofproto-provider.h */