2 * Copyright (c) 2008, 2009, 2010, 2011, 2012 Nicira, Inc.
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.
18 #include "dpif-provider.h"
28 #include "dynamic-string.h"
33 #include "ofp-errors.h"
34 #include "ofp-print.h"
38 #include "poll-loop.h"
46 VLOG_DEFINE_THIS_MODULE(dpif
);
48 COVERAGE_DEFINE(dpif_destroy
);
49 COVERAGE_DEFINE(dpif_port_add
);
50 COVERAGE_DEFINE(dpif_port_del
);
51 COVERAGE_DEFINE(dpif_flow_flush
);
52 COVERAGE_DEFINE(dpif_flow_get
);
53 COVERAGE_DEFINE(dpif_flow_put
);
54 COVERAGE_DEFINE(dpif_flow_del
);
55 COVERAGE_DEFINE(dpif_flow_query_list
);
56 COVERAGE_DEFINE(dpif_flow_query_list_n
);
57 COVERAGE_DEFINE(dpif_execute
);
58 COVERAGE_DEFINE(dpif_purge
);
60 static const struct dpif_class
*base_dpif_classes
[] = {
67 struct registered_dpif_class
{
68 const struct dpif_class
*dpif_class
;
71 static struct shash dpif_classes
= SHASH_INITIALIZER(&dpif_classes
);
72 static struct sset dpif_blacklist
= SSET_INITIALIZER(&dpif_blacklist
);
74 /* Rate limit for individual messages going to or from the datapath, output at
75 * DBG level. This is very high because, if these are enabled, it is because
76 * we really need to see them. */
77 static struct vlog_rate_limit dpmsg_rl
= VLOG_RATE_LIMIT_INIT(600, 600);
79 /* Not really much point in logging many dpif errors. */
80 static struct vlog_rate_limit error_rl
= VLOG_RATE_LIMIT_INIT(60, 5);
82 static void log_flow_message(const struct dpif
*dpif
, int error
,
83 const char *operation
,
84 const struct nlattr
*key
, size_t key_len
,
85 const struct dpif_flow_stats
*stats
,
86 const struct nlattr
*actions
, size_t actions_len
);
87 static void log_operation(const struct dpif
*, const char *operation
,
89 static bool should_log_flow_message(int error
);
90 static void log_flow_put_message(struct dpif
*, const struct dpif_flow_put
*,
92 static void log_flow_del_message(struct dpif
*, const struct dpif_flow_del
*,
94 static void log_execute_message(struct dpif
*, const struct dpif_execute
*,
100 static int status
= -1;
106 for (i
= 0; i
< ARRAY_SIZE(base_dpif_classes
); i
++) {
107 dp_register_provider(base_dpif_classes
[i
]);
112 /* Registers a new datapath provider. After successful registration, new
113 * datapaths of that type can be opened using dpif_open(). */
115 dp_register_provider(const struct dpif_class
*new_class
)
117 struct registered_dpif_class
*registered_class
;
119 if (sset_contains(&dpif_blacklist
, new_class
->type
)) {
120 VLOG_DBG("attempted to register blacklisted provider: %s",
125 if (shash_find(&dpif_classes
, new_class
->type
)) {
126 VLOG_WARN("attempted to register duplicate datapath provider: %s",
131 registered_class
= xmalloc(sizeof *registered_class
);
132 registered_class
->dpif_class
= new_class
;
133 registered_class
->refcount
= 0;
135 shash_add(&dpif_classes
, new_class
->type
, registered_class
);
140 /* Unregisters a datapath provider. 'type' must have been previously
141 * registered and not currently be in use by any dpifs. After unregistration
142 * new datapaths of that type cannot be opened using dpif_open(). */
144 dp_unregister_provider(const char *type
)
146 struct shash_node
*node
;
147 struct registered_dpif_class
*registered_class
;
149 node
= shash_find(&dpif_classes
, type
);
151 VLOG_WARN("attempted to unregister a datapath provider that is not "
152 "registered: %s", type
);
156 registered_class
= node
->data
;
157 if (registered_class
->refcount
) {
158 VLOG_WARN("attempted to unregister in use datapath provider: %s", type
);
162 shash_delete(&dpif_classes
, node
);
163 free(registered_class
);
168 /* Blacklists a provider. Causes future calls of dp_register_provider() with
169 * a dpif_class which implements 'type' to fail. */
171 dp_blacklist_provider(const char *type
)
173 sset_add(&dpif_blacklist
, type
);
176 /* Clears 'types' and enumerates the types of all currently registered datapath
177 * providers into it. The caller must first initialize the sset. */
179 dp_enumerate_types(struct sset
*types
)
181 struct shash_node
*node
;
186 SHASH_FOR_EACH(node
, &dpif_classes
) {
187 const struct registered_dpif_class
*registered_class
= node
->data
;
188 sset_add(types
, registered_class
->dpif_class
->type
);
192 /* Clears 'names' and enumerates the names of all known created datapaths with
193 * the given 'type'. The caller must first initialize the sset. Returns 0 if
194 * successful, otherwise a positive errno value.
196 * Some kinds of datapaths might not be practically enumerable. This is not
197 * considered an error. */
199 dp_enumerate_names(const char *type
, struct sset
*names
)
201 const struct registered_dpif_class
*registered_class
;
202 const struct dpif_class
*dpif_class
;
208 registered_class
= shash_find_data(&dpif_classes
, type
);
209 if (!registered_class
) {
210 VLOG_WARN("could not enumerate unknown type: %s", type
);
214 dpif_class
= registered_class
->dpif_class
;
215 error
= dpif_class
->enumerate
? dpif_class
->enumerate(names
) : 0;
218 VLOG_WARN("failed to enumerate %s datapaths: %s", dpif_class
->type
,
225 /* Parses 'datapath_name_', which is of the form [type@]name into its
226 * component pieces. 'name' and 'type' must be freed by the caller.
228 * The returned 'type' is normalized, as if by dpif_normalize_type(). */
230 dp_parse_name(const char *datapath_name_
, char **name
, char **type
)
232 char *datapath_name
= xstrdup(datapath_name_
);
235 separator
= strchr(datapath_name
, '@');
238 *type
= datapath_name
;
239 *name
= xstrdup(dpif_normalize_type(separator
+ 1));
241 *name
= datapath_name
;
242 *type
= xstrdup(dpif_normalize_type(NULL
));
247 do_open(const char *name
, const char *type
, bool create
, struct dpif
**dpifp
)
249 struct dpif
*dpif
= NULL
;
251 struct registered_dpif_class
*registered_class
;
255 type
= dpif_normalize_type(type
);
257 registered_class
= shash_find_data(&dpif_classes
, type
);
258 if (!registered_class
) {
259 VLOG_WARN("could not create datapath %s of unknown type %s", name
,
261 error
= EAFNOSUPPORT
;
265 error
= registered_class
->dpif_class
->open(registered_class
->dpif_class
,
266 name
, create
, &dpif
);
268 assert(dpif
->dpif_class
== registered_class
->dpif_class
);
269 registered_class
->refcount
++;
273 *dpifp
= error
? NULL
: dpif
;
277 /* Tries to open an existing datapath named 'name' and type 'type'. Will fail
278 * if no datapath with 'name' and 'type' exists. 'type' may be either NULL or
279 * the empty string to specify the default system type. Returns 0 if
280 * successful, otherwise a positive errno value. On success stores a pointer
281 * to the datapath in '*dpifp', otherwise a null pointer. */
283 dpif_open(const char *name
, const char *type
, struct dpif
**dpifp
)
285 return do_open(name
, type
, false, dpifp
);
288 /* Tries to create and open a new datapath with the given 'name' and 'type'.
289 * 'type' may be either NULL or the empty string to specify the default system
290 * type. Will fail if a datapath with 'name' and 'type' already exists.
291 * Returns 0 if successful, otherwise a positive errno value. On success
292 * stores a pointer to the datapath in '*dpifp', otherwise a null pointer. */
294 dpif_create(const char *name
, const char *type
, struct dpif
**dpifp
)
296 return do_open(name
, type
, true, dpifp
);
299 /* Tries to open a datapath with the given 'name' and 'type', creating it if it
300 * does not exist. 'type' may be either NULL or the empty string to specify
301 * the default system type. Returns 0 if successful, otherwise a positive
302 * errno value. On success stores a pointer to the datapath in '*dpifp',
303 * otherwise a null pointer. */
305 dpif_create_and_open(const char *name
, const char *type
, struct dpif
**dpifp
)
309 error
= dpif_create(name
, type
, dpifp
);
310 if (error
== EEXIST
|| error
== EBUSY
) {
311 error
= dpif_open(name
, type
, dpifp
);
313 VLOG_WARN("datapath %s already exists but cannot be opened: %s",
314 name
, strerror(error
));
317 VLOG_WARN("failed to create datapath %s: %s", name
, strerror(error
));
322 /* Closes and frees the connection to 'dpif'. Does not destroy the datapath
323 * itself; call dpif_delete() first, instead, if that is desirable. */
325 dpif_close(struct dpif
*dpif
)
328 struct registered_dpif_class
*registered_class
;
330 registered_class
= shash_find_data(&dpif_classes
,
331 dpif
->dpif_class
->type
);
332 assert(registered_class
);
333 assert(registered_class
->refcount
);
335 registered_class
->refcount
--;
336 dpif_uninit(dpif
, true);
340 /* Performs periodic work needed by 'dpif'. */
342 dpif_run(struct dpif
*dpif
)
344 if (dpif
->dpif_class
->run
) {
345 dpif
->dpif_class
->run(dpif
);
349 /* Arranges for poll_block() to wake up when dp_run() needs to be called for
352 dpif_wait(struct dpif
*dpif
)
354 if (dpif
->dpif_class
->wait
) {
355 dpif
->dpif_class
->wait(dpif
);
359 /* Returns the name of datapath 'dpif' prefixed with the type
360 * (for use in log messages). */
362 dpif_name(const struct dpif
*dpif
)
364 return dpif
->full_name
;
367 /* Returns the name of datapath 'dpif' without the type
368 * (for use in device names). */
370 dpif_base_name(const struct dpif
*dpif
)
372 return dpif
->base_name
;
375 /* Returns the fully spelled out name for the given datapath 'type'.
377 * Normalized type string can be compared with strcmp(). Unnormalized type
378 * string might be the same even if they have different spellings. */
380 dpif_normalize_type(const char *type
)
382 return type
&& type
[0] ? type
: "system";
385 /* Destroys the datapath that 'dpif' is connected to, first removing all of its
386 * ports. After calling this function, it does not make sense to pass 'dpif'
387 * to any functions other than dpif_name() or dpif_close(). */
389 dpif_delete(struct dpif
*dpif
)
393 COVERAGE_INC(dpif_destroy
);
395 error
= dpif
->dpif_class
->destroy(dpif
);
396 log_operation(dpif
, "delete", error
);
400 /* Retrieves statistics for 'dpif' into 'stats'. Returns 0 if successful,
401 * otherwise a positive errno value. */
403 dpif_get_dp_stats(const struct dpif
*dpif
, struct dpif_dp_stats
*stats
)
405 int error
= dpif
->dpif_class
->get_stats(dpif
, stats
);
407 memset(stats
, 0, sizeof *stats
);
409 log_operation(dpif
, "get_stats", error
);
413 /* Attempts to add 'netdev' as a port on 'dpif'. If successful, returns 0 and
414 * sets '*port_nop' to the new port's port number (if 'port_nop' is non-null).
415 * On failure, returns a positive errno value and sets '*port_nop' to
416 * UINT16_MAX (if 'port_nop' is non-null). */
418 dpif_port_add(struct dpif
*dpif
, struct netdev
*netdev
, uint16_t *port_nop
)
420 const char *netdev_name
= netdev_get_name(netdev
);
424 COVERAGE_INC(dpif_port_add
);
426 error
= dpif
->dpif_class
->port_add(dpif
, netdev
, &port_no
);
428 VLOG_DBG_RL(&dpmsg_rl
, "%s: added %s as port %"PRIu16
,
429 dpif_name(dpif
), netdev_name
, port_no
);
431 VLOG_WARN_RL(&error_rl
, "%s: failed to add %s as port: %s",
432 dpif_name(dpif
), netdev_name
, strerror(error
));
433 port_no
= UINT16_MAX
;
441 /* Attempts to remove 'dpif''s port number 'port_no'. Returns 0 if successful,
442 * otherwise a positive errno value. */
444 dpif_port_del(struct dpif
*dpif
, uint16_t port_no
)
448 COVERAGE_INC(dpif_port_del
);
450 error
= dpif
->dpif_class
->port_del(dpif
, port_no
);
452 VLOG_DBG_RL(&dpmsg_rl
, "%s: port_del(%"PRIu16
")",
453 dpif_name(dpif
), port_no
);
455 log_operation(dpif
, "port_del", error
);
460 /* Makes a deep copy of 'src' into 'dst'. */
462 dpif_port_clone(struct dpif_port
*dst
, const struct dpif_port
*src
)
464 dst
->name
= xstrdup(src
->name
);
465 dst
->type
= xstrdup(src
->type
);
466 dst
->port_no
= src
->port_no
;
469 /* Frees memory allocated to members of 'dpif_port'.
471 * Do not call this function on a dpif_port obtained from
472 * dpif_port_dump_next(): that function retains ownership of the data in the
475 dpif_port_destroy(struct dpif_port
*dpif_port
)
477 free(dpif_port
->name
);
478 free(dpif_port
->type
);
481 /* Looks up port number 'port_no' in 'dpif'. On success, returns 0 and
482 * initializes '*port' appropriately; on failure, returns a positive errno
485 * The caller owns the data in 'port' and must free it with
486 * dpif_port_destroy() when it is no longer needed. */
488 dpif_port_query_by_number(const struct dpif
*dpif
, uint16_t port_no
,
489 struct dpif_port
*port
)
491 int error
= dpif
->dpif_class
->port_query_by_number(dpif
, port_no
, port
);
493 VLOG_DBG_RL(&dpmsg_rl
, "%s: port %"PRIu16
" is device %s",
494 dpif_name(dpif
), port_no
, port
->name
);
496 memset(port
, 0, sizeof *port
);
497 VLOG_WARN_RL(&error_rl
, "%s: failed to query port %"PRIu16
": %s",
498 dpif_name(dpif
), port_no
, strerror(error
));
503 /* Looks up port named 'devname' in 'dpif'. On success, returns 0 and
504 * initializes '*port' appropriately; on failure, returns a positive errno
507 * The caller owns the data in 'port' and must free it with
508 * dpif_port_destroy() when it is no longer needed. */
510 dpif_port_query_by_name(const struct dpif
*dpif
, const char *devname
,
511 struct dpif_port
*port
)
513 int error
= dpif
->dpif_class
->port_query_by_name(dpif
, devname
, port
);
515 VLOG_DBG_RL(&dpmsg_rl
, "%s: device %s is on port %"PRIu16
,
516 dpif_name(dpif
), devname
, port
->port_no
);
518 memset(port
, 0, sizeof *port
);
520 /* For ENOENT or ENODEV we use DBG level because the caller is probably
521 * interested in whether 'dpif' actually has a port 'devname', so that
522 * it's not an issue worth logging if it doesn't. Other errors are
523 * uncommon and more likely to indicate a real problem. */
525 error
== ENOENT
|| error
== ENODEV
? VLL_DBG
: VLL_WARN
,
526 "%s: failed to query port %s: %s",
527 dpif_name(dpif
), devname
, strerror(error
));
532 /* Returns one greater than the maximum port number accepted in flow
535 dpif_get_max_ports(const struct dpif
*dpif
)
537 return dpif
->dpif_class
->get_max_ports(dpif
);
540 /* Returns the Netlink PID value to supply in OVS_ACTION_ATTR_USERSPACE actions
541 * as the OVS_USERSPACE_ATTR_PID attribute's value, for use in flows whose
542 * packets arrived on port 'port_no'.
544 * The return value is only meaningful when DPIF_UC_ACTION has been enabled in
545 * the 'dpif''s listen mask. It is allowed to change when DPIF_UC_ACTION is
546 * disabled and then re-enabled, so a client that does that must be prepared to
547 * update all of the flows that it installed that contain
548 * OVS_ACTION_ATTR_USERSPACE actions. */
550 dpif_port_get_pid(const struct dpif
*dpif
, uint16_t port_no
)
552 return (dpif
->dpif_class
->port_get_pid
553 ? (dpif
->dpif_class
->port_get_pid
)(dpif
, port_no
)
557 /* Looks up port number 'port_no' in 'dpif'. On success, returns 0 and copies
558 * the port's name into the 'name_size' bytes in 'name', ensuring that the
559 * result is null-terminated. On failure, returns a positive errno value and
560 * makes 'name' the empty string. */
562 dpif_port_get_name(struct dpif
*dpif
, uint16_t port_no
,
563 char *name
, size_t name_size
)
565 struct dpif_port port
;
568 assert(name_size
> 0);
570 error
= dpif_port_query_by_number(dpif
, port_no
, &port
);
572 ovs_strlcpy(name
, port
.name
, name_size
);
573 dpif_port_destroy(&port
);
580 /* Initializes 'dump' to begin dumping the ports in a dpif.
582 * This function provides no status indication. An error status for the entire
583 * dump operation is provided when it is completed by calling
584 * dpif_port_dump_done().
587 dpif_port_dump_start(struct dpif_port_dump
*dump
, const struct dpif
*dpif
)
590 dump
->error
= dpif
->dpif_class
->port_dump_start(dpif
, &dump
->state
);
591 log_operation(dpif
, "port_dump_start", dump
->error
);
594 /* Attempts to retrieve another port from 'dump', which must have been
595 * initialized with dpif_port_dump_start(). On success, stores a new dpif_port
596 * into 'port' and returns true. On failure, returns false.
598 * Failure might indicate an actual error or merely that the last port has been
599 * dumped. An error status for the entire dump operation is provided when it
600 * is completed by calling dpif_port_dump_done().
602 * The dpif owns the data stored in 'port'. It will remain valid until at
603 * least the next time 'dump' is passed to dpif_port_dump_next() or
604 * dpif_port_dump_done(). */
606 dpif_port_dump_next(struct dpif_port_dump
*dump
, struct dpif_port
*port
)
608 const struct dpif
*dpif
= dump
->dpif
;
614 dump
->error
= dpif
->dpif_class
->port_dump_next(dpif
, dump
->state
, port
);
615 if (dump
->error
== EOF
) {
616 VLOG_DBG_RL(&dpmsg_rl
, "%s: dumped all ports", dpif_name(dpif
));
618 log_operation(dpif
, "port_dump_next", dump
->error
);
622 dpif
->dpif_class
->port_dump_done(dpif
, dump
->state
);
628 /* Completes port table dump operation 'dump', which must have been initialized
629 * with dpif_port_dump_start(). Returns 0 if the dump operation was
630 * error-free, otherwise a positive errno value describing the problem. */
632 dpif_port_dump_done(struct dpif_port_dump
*dump
)
634 const struct dpif
*dpif
= dump
->dpif
;
636 dump
->error
= dpif
->dpif_class
->port_dump_done(dpif
, dump
->state
);
637 log_operation(dpif
, "port_dump_done", dump
->error
);
639 return dump
->error
== EOF
? 0 : dump
->error
;
642 /* Polls for changes in the set of ports in 'dpif'. If the set of ports in
643 * 'dpif' has changed, this function does one of the following:
645 * - Stores the name of the device that was added to or deleted from 'dpif' in
646 * '*devnamep' and returns 0. The caller is responsible for freeing
647 * '*devnamep' (with free()) when it no longer needs it.
649 * - Returns ENOBUFS and sets '*devnamep' to NULL.
651 * This function may also return 'false positives', where it returns 0 and
652 * '*devnamep' names a device that was not actually added or deleted or it
653 * returns ENOBUFS without any change.
655 * Returns EAGAIN if the set of ports in 'dpif' has not changed. May also
656 * return other positive errno values to indicate that something has gone
659 dpif_port_poll(const struct dpif
*dpif
, char **devnamep
)
661 int error
= dpif
->dpif_class
->port_poll(dpif
, devnamep
);
668 /* Arranges for the poll loop to wake up when port_poll(dpif) will return a
669 * value other than EAGAIN. */
671 dpif_port_poll_wait(const struct dpif
*dpif
)
673 dpif
->dpif_class
->port_poll_wait(dpif
);
676 /* Extracts the flow stats for a packet. The 'flow' and 'packet'
677 * arguments must have been initialized through a call to flow_extract(). */
679 dpif_flow_stats_extract(const struct flow
*flow
, const struct ofpbuf
*packet
,
680 struct dpif_flow_stats
*stats
)
682 stats
->tcp_flags
= packet_get_tcp_flags(packet
, flow
);
683 stats
->n_bytes
= packet
->size
;
684 stats
->n_packets
= 1;
685 stats
->used
= time_msec();
688 /* Appends a human-readable representation of 'stats' to 's'. */
690 dpif_flow_stats_format(const struct dpif_flow_stats
*stats
, struct ds
*s
)
692 ds_put_format(s
, "packets:%"PRIu64
", bytes:%"PRIu64
", used:",
693 stats
->n_packets
, stats
->n_bytes
);
695 ds_put_format(s
, "%.3fs", (time_msec() - stats
->used
) / 1000.0);
697 ds_put_format(s
, "never");
699 if (stats
->tcp_flags
) {
700 ds_put_cstr(s
, ", flags:");
701 packet_format_tcp_flags(s
, stats
->tcp_flags
);
705 /* Deletes all flows from 'dpif'. Returns 0 if successful, otherwise a
706 * positive errno value. */
708 dpif_flow_flush(struct dpif
*dpif
)
712 COVERAGE_INC(dpif_flow_flush
);
714 error
= dpif
->dpif_class
->flow_flush(dpif
);
715 log_operation(dpif
, "flow_flush", error
);
719 /* Queries 'dpif' for a flow entry. The flow is specified by the Netlink
720 * attributes with types OVS_KEY_ATTR_* in the 'key_len' bytes starting at
723 * Returns 0 if successful. If no flow matches, returns ENOENT. On other
724 * failure, returns a positive errno value.
726 * If 'actionsp' is nonnull, then on success '*actionsp' will be set to an
727 * ofpbuf owned by the caller that contains the Netlink attributes for the
728 * flow's actions. The caller must free the ofpbuf (with ofpbuf_delete()) when
729 * it is no longer needed.
731 * If 'stats' is nonnull, then on success it will be updated with the flow's
734 dpif_flow_get(const struct dpif
*dpif
,
735 const struct nlattr
*key
, size_t key_len
,
736 struct ofpbuf
**actionsp
, struct dpif_flow_stats
*stats
)
740 COVERAGE_INC(dpif_flow_get
);
742 error
= dpif
->dpif_class
->flow_get(dpif
, key
, key_len
, actionsp
, stats
);
748 memset(stats
, 0, sizeof *stats
);
751 if (should_log_flow_message(error
)) {
752 const struct nlattr
*actions
;
755 if (!error
&& actionsp
) {
756 actions
= (*actionsp
)->data
;
757 actions_len
= (*actionsp
)->size
;
762 log_flow_message(dpif
, error
, "flow_get", key
, key_len
, stats
,
763 actions
, actions_len
);
769 dpif_flow_put__(struct dpif
*dpif
, const struct dpif_flow_put
*put
)
773 COVERAGE_INC(dpif_flow_put
);
774 assert(!(put
->flags
& ~(DPIF_FP_CREATE
| DPIF_FP_MODIFY
775 | DPIF_FP_ZERO_STATS
)));
777 error
= dpif
->dpif_class
->flow_put(dpif
, put
);
778 if (error
&& put
->stats
) {
779 memset(put
->stats
, 0, sizeof *put
->stats
);
781 log_flow_put_message(dpif
, put
, error
);
785 /* Adds or modifies a flow in 'dpif'. The flow is specified by the Netlink
786 * attributes with types OVS_KEY_ATTR_* in the 'key_len' bytes starting at
787 * 'key'. The associated actions are specified by the Netlink attributes with
788 * types OVS_ACTION_ATTR_* in the 'actions_len' bytes starting at 'actions'.
790 * - If the flow's key does not exist in 'dpif', then the flow will be added if
791 * 'flags' includes DPIF_FP_CREATE. Otherwise the operation will fail with
794 * If the operation succeeds, then 'stats', if nonnull, will be zeroed.
796 * - If the flow's key does exist in 'dpif', then the flow's actions will be
797 * updated if 'flags' includes DPIF_FP_MODIFY. Otherwise the operation will
798 * fail with EEXIST. If the flow's actions are updated, then its statistics
799 * will be zeroed if 'flags' includes DPIF_FP_ZERO_STATS, and left as-is
802 * If the operation succeeds, then 'stats', if nonnull, will be set to the
803 * flow's statistics before the update.
806 dpif_flow_put(struct dpif
*dpif
, enum dpif_flow_put_flags flags
,
807 const struct nlattr
*key
, size_t key_len
,
808 const struct nlattr
*actions
, size_t actions_len
,
809 struct dpif_flow_stats
*stats
)
811 struct dpif_flow_put put
;
815 put
.key_len
= key_len
;
816 put
.actions
= actions
;
817 put
.actions_len
= actions_len
;
819 return dpif_flow_put__(dpif
, &put
);
823 dpif_flow_del__(struct dpif
*dpif
, struct dpif_flow_del
*del
)
827 COVERAGE_INC(dpif_flow_del
);
829 error
= dpif
->dpif_class
->flow_del(dpif
, del
);
830 if (error
&& del
->stats
) {
831 memset(del
->stats
, 0, sizeof *del
->stats
);
833 log_flow_del_message(dpif
, del
, error
);
837 /* Deletes a flow from 'dpif' and returns 0, or returns ENOENT if 'dpif' does
838 * not contain such a flow. The flow is specified by the Netlink attributes
839 * with types OVS_KEY_ATTR_* in the 'key_len' bytes starting at 'key'.
841 * If the operation succeeds, then 'stats', if nonnull, will be set to the
842 * flow's statistics before its deletion. */
844 dpif_flow_del(struct dpif
*dpif
,
845 const struct nlattr
*key
, size_t key_len
,
846 struct dpif_flow_stats
*stats
)
848 struct dpif_flow_del del
;
851 del
.key_len
= key_len
;
853 return dpif_flow_del__(dpif
, &del
);
856 /* Initializes 'dump' to begin dumping the flows in a dpif.
858 * This function provides no status indication. An error status for the entire
859 * dump operation is provided when it is completed by calling
860 * dpif_flow_dump_done().
863 dpif_flow_dump_start(struct dpif_flow_dump
*dump
, const struct dpif
*dpif
)
866 dump
->error
= dpif
->dpif_class
->flow_dump_start(dpif
, &dump
->state
);
867 log_operation(dpif
, "flow_dump_start", dump
->error
);
870 /* Attempts to retrieve another flow from 'dump', which must have been
871 * initialized with dpif_flow_dump_start(). On success, updates the output
872 * parameters as described below and returns true. Otherwise, returns false.
873 * Failure might indicate an actual error or merely the end of the flow table.
874 * An error status for the entire dump operation is provided when it is
875 * completed by calling dpif_flow_dump_done().
877 * On success, if 'key' and 'key_len' are nonnull then '*key' and '*key_len'
878 * will be set to Netlink attributes with types OVS_KEY_ATTR_* representing the
879 * dumped flow's key. If 'actions' and 'actions_len' are nonnull then they are
880 * set to Netlink attributes with types OVS_ACTION_ATTR_* representing the
881 * dumped flow's actions. If 'stats' is nonnull then it will be set to the
882 * dumped flow's statistics.
884 * All of the returned data is owned by 'dpif', not by the caller, and the
885 * caller must not modify or free it. 'dpif' guarantees that it remains
886 * accessible and unchanging until at least the next call to 'flow_dump_next'
887 * or 'flow_dump_done' for 'dump'. */
889 dpif_flow_dump_next(struct dpif_flow_dump
*dump
,
890 const struct nlattr
**key
, size_t *key_len
,
891 const struct nlattr
**actions
, size_t *actions_len
,
892 const struct dpif_flow_stats
**stats
)
894 const struct dpif
*dpif
= dump
->dpif
;
895 int error
= dump
->error
;
898 error
= dpif
->dpif_class
->flow_dump_next(dpif
, dump
->state
,
900 actions
, actions_len
,
903 dpif
->dpif_class
->flow_dump_done(dpif
, dump
->state
);
921 VLOG_DBG_RL(&dpmsg_rl
, "%s: dumped all flows", dpif_name(dpif
));
922 } else if (should_log_flow_message(error
)) {
923 log_flow_message(dpif
, error
, "flow_dump",
924 key
? *key
: NULL
, key
? *key_len
: 0,
925 stats
? *stats
: NULL
, actions
? *actions
: NULL
,
926 actions
? *actions_len
: 0);
933 /* Completes flow table dump operation 'dump', which must have been initialized
934 * with dpif_flow_dump_start(). Returns 0 if the dump operation was
935 * error-free, otherwise a positive errno value describing the problem. */
937 dpif_flow_dump_done(struct dpif_flow_dump
*dump
)
939 const struct dpif
*dpif
= dump
->dpif
;
941 dump
->error
= dpif
->dpif_class
->flow_dump_done(dpif
, dump
->state
);
942 log_operation(dpif
, "flow_dump_done", dump
->error
);
944 return dump
->error
== EOF
? 0 : dump
->error
;
948 dpif_execute__(struct dpif
*dpif
, const struct dpif_execute
*execute
)
952 COVERAGE_INC(dpif_execute
);
953 if (execute
->actions_len
> 0) {
954 error
= dpif
->dpif_class
->execute(dpif
, execute
);
959 log_execute_message(dpif
, execute
, error
);
964 /* Causes 'dpif' to perform the 'actions_len' bytes of actions in 'actions' on
965 * the Ethernet frame specified in 'packet' taken from the flow specified in
966 * the 'key_len' bytes of 'key'. ('key' is mostly redundant with 'packet', but
967 * it contains some metadata that cannot be recovered from 'packet', such as
968 * tun_id and in_port.)
970 * Returns 0 if successful, otherwise a positive errno value. */
972 dpif_execute(struct dpif
*dpif
,
973 const struct nlattr
*key
, size_t key_len
,
974 const struct nlattr
*actions
, size_t actions_len
,
975 const struct ofpbuf
*buf
)
977 struct dpif_execute execute
;
980 execute
.key_len
= key_len
;
981 execute
.actions
= actions
;
982 execute
.actions_len
= actions_len
;
983 execute
.packet
= buf
;
984 return dpif_execute__(dpif
, &execute
);
987 /* Executes each of the 'n_ops' operations in 'ops' on 'dpif', in the order in
988 * which they are specified, placing each operation's results in the "output"
989 * members documented in comments.
991 * This function exists because some datapaths can perform batched operations
992 * faster than individual operations. */
994 dpif_operate(struct dpif
*dpif
, struct dpif_op
**ops
, size_t n_ops
)
998 if (dpif
->dpif_class
->operate
) {
999 dpif
->dpif_class
->operate(dpif
, ops
, n_ops
);
1001 for (i
= 0; i
< n_ops
; i
++) {
1002 struct dpif_op
*op
= ops
[i
];
1005 case DPIF_OP_FLOW_PUT
:
1006 log_flow_put_message(dpif
, &op
->u
.flow_put
, op
->error
);
1009 case DPIF_OP_FLOW_DEL
:
1010 log_flow_del_message(dpif
, &op
->u
.flow_del
, op
->error
);
1013 case DPIF_OP_EXECUTE
:
1014 log_execute_message(dpif
, &op
->u
.execute
, op
->error
);
1021 for (i
= 0; i
< n_ops
; i
++) {
1022 struct dpif_op
*op
= ops
[i
];
1025 case DPIF_OP_FLOW_PUT
:
1026 op
->error
= dpif_flow_put__(dpif
, &op
->u
.flow_put
);
1029 case DPIF_OP_FLOW_DEL
:
1030 op
->error
= dpif_flow_del__(dpif
, &op
->u
.flow_del
);
1033 case DPIF_OP_EXECUTE
:
1034 op
->error
= dpif_execute__(dpif
, &op
->u
.execute
);
1044 /* Returns a string that represents 'type', for use in log messages. */
1046 dpif_upcall_type_to_string(enum dpif_upcall_type type
)
1049 case DPIF_UC_MISS
: return "miss";
1050 case DPIF_UC_ACTION
: return "action";
1051 case DPIF_N_UC_TYPES
: default: return "<unknown>";
1055 /* Enables or disables receiving packets with dpif_recv() on 'dpif'. Returns 0
1056 * if successful, otherwise a positive errno value.
1058 * Turning packet receive off and then back on may change the Netlink PID
1059 * assignments returned by dpif_port_get_pid(). If the client does this, it
1060 * must update all of the flows that have OVS_ACTION_ATTR_USERSPACE actions
1061 * using the new PID assignment. */
1063 dpif_recv_set(struct dpif
*dpif
, bool enable
)
1065 int error
= dpif
->dpif_class
->recv_set(dpif
, enable
);
1066 log_operation(dpif
, "recv_set", error
);
1070 /* Polls for an upcall from 'dpif'. If successful, stores the upcall into
1071 * '*upcall', using 'buf' for storage. Should only be called if
1072 * dpif_recv_set() has been used to enable receiving packets on 'dpif'.
1074 * 'upcall->packet' and 'upcall->key' point into data in the caller-provided
1075 * 'buf', so their memory cannot be freed separately from 'buf'. (This is
1076 * hardly a great way to do things but it works out OK for the dpif providers
1077 * and clients that exist so far.)
1079 * Returns 0 if successful, otherwise a positive errno value. Returns EAGAIN
1080 * if no upcall is immediately available. */
1082 dpif_recv(struct dpif
*dpif
, struct dpif_upcall
*upcall
, struct ofpbuf
*buf
)
1084 int error
= dpif
->dpif_class
->recv(dpif
, upcall
, buf
);
1085 if (!error
&& !VLOG_DROP_DBG(&dpmsg_rl
)) {
1089 packet
= ofp_packet_to_string(upcall
->packet
->data
,
1090 upcall
->packet
->size
);
1093 odp_flow_key_format(upcall
->key
, upcall
->key_len
, &flow
);
1095 VLOG_DBG("%s: %s upcall:\n%s\n%s",
1096 dpif_name(dpif
), dpif_upcall_type_to_string(upcall
->type
),
1097 ds_cstr(&flow
), packet
);
1101 } else if (error
&& error
!= EAGAIN
) {
1102 log_operation(dpif
, "recv", error
);
1107 /* Discards all messages that would otherwise be received by dpif_recv() on
1110 dpif_recv_purge(struct dpif
*dpif
)
1112 COVERAGE_INC(dpif_purge
);
1113 if (dpif
->dpif_class
->recv_purge
) {
1114 dpif
->dpif_class
->recv_purge(dpif
);
1118 /* Arranges for the poll loop to wake up when 'dpif' has a message queued to be
1119 * received with dpif_recv(). */
1121 dpif_recv_wait(struct dpif
*dpif
)
1123 dpif
->dpif_class
->recv_wait(dpif
);
1126 /* Obtains the NetFlow engine type and engine ID for 'dpif' into '*engine_type'
1127 * and '*engine_id', respectively. */
1129 dpif_get_netflow_ids(const struct dpif
*dpif
,
1130 uint8_t *engine_type
, uint8_t *engine_id
)
1132 *engine_type
= dpif
->netflow_engine_type
;
1133 *engine_id
= dpif
->netflow_engine_id
;
1136 /* Translates OpenFlow queue ID 'queue_id' (in host byte order) into a priority
1137 * value used for setting packet priority.
1138 * On success, returns 0 and stores the priority into '*priority'.
1139 * On failure, returns a positive errno value and stores 0 into '*priority'. */
1141 dpif_queue_to_priority(const struct dpif
*dpif
, uint32_t queue_id
,
1144 int error
= (dpif
->dpif_class
->queue_to_priority
1145 ? dpif
->dpif_class
->queue_to_priority(dpif
, queue_id
,
1151 log_operation(dpif
, "queue_to_priority", error
);
1156 dpif_init(struct dpif
*dpif
, const struct dpif_class
*dpif_class
,
1158 uint8_t netflow_engine_type
, uint8_t netflow_engine_id
)
1160 dpif
->dpif_class
= dpif_class
;
1161 dpif
->base_name
= xstrdup(name
);
1162 dpif
->full_name
= xasprintf("%s@%s", dpif_class
->type
, name
);
1163 dpif
->netflow_engine_type
= netflow_engine_type
;
1164 dpif
->netflow_engine_id
= netflow_engine_id
;
1167 /* Undoes the results of initialization.
1169 * Normally this function only needs to be called from dpif_close().
1170 * However, it may be called by providers due to an error on opening
1171 * that occurs after initialization. It this case dpif_close() would
1172 * never be called. */
1174 dpif_uninit(struct dpif
*dpif
, bool close
)
1176 char *base_name
= dpif
->base_name
;
1177 char *full_name
= dpif
->full_name
;
1180 dpif
->dpif_class
->close(dpif
);
1188 log_operation(const struct dpif
*dpif
, const char *operation
, int error
)
1191 VLOG_DBG_RL(&dpmsg_rl
, "%s: %s success", dpif_name(dpif
), operation
);
1192 } else if (ofperr_is_valid(error
)) {
1193 VLOG_WARN_RL(&error_rl
, "%s: %s failed (%s)",
1194 dpif_name(dpif
), operation
, ofperr_get_name(error
));
1196 VLOG_WARN_RL(&error_rl
, "%s: %s failed (%s)",
1197 dpif_name(dpif
), operation
, strerror(error
));
1201 static enum vlog_level
1202 flow_message_log_level(int error
)
1204 return error
? VLL_WARN
: VLL_DBG
;
1208 should_log_flow_message(int error
)
1210 return !vlog_should_drop(THIS_MODULE
, flow_message_log_level(error
),
1211 error
? &error_rl
: &dpmsg_rl
);
1215 log_flow_message(const struct dpif
*dpif
, int error
, const char *operation
,
1216 const struct nlattr
*key
, size_t key_len
,
1217 const struct dpif_flow_stats
*stats
,
1218 const struct nlattr
*actions
, size_t actions_len
)
1220 struct ds ds
= DS_EMPTY_INITIALIZER
;
1221 ds_put_format(&ds
, "%s: ", dpif_name(dpif
));
1223 ds_put_cstr(&ds
, "failed to ");
1225 ds_put_format(&ds
, "%s ", operation
);
1227 ds_put_format(&ds
, "(%s) ", strerror(error
));
1229 odp_flow_key_format(key
, key_len
, &ds
);
1231 ds_put_cstr(&ds
, ", ");
1232 dpif_flow_stats_format(stats
, &ds
);
1234 if (actions
|| actions_len
) {
1235 ds_put_cstr(&ds
, ", actions:");
1236 format_odp_actions(&ds
, actions
, actions_len
);
1238 vlog(THIS_MODULE
, flow_message_log_level(error
), "%s", ds_cstr(&ds
));
1243 log_flow_put_message(struct dpif
*dpif
, const struct dpif_flow_put
*put
,
1246 if (should_log_flow_message(error
)) {
1250 ds_put_cstr(&s
, "put");
1251 if (put
->flags
& DPIF_FP_CREATE
) {
1252 ds_put_cstr(&s
, "[create]");
1254 if (put
->flags
& DPIF_FP_MODIFY
) {
1255 ds_put_cstr(&s
, "[modify]");
1257 if (put
->flags
& DPIF_FP_ZERO_STATS
) {
1258 ds_put_cstr(&s
, "[zero]");
1260 log_flow_message(dpif
, error
, ds_cstr(&s
),
1261 put
->key
, put
->key_len
, put
->stats
,
1262 put
->actions
, put
->actions_len
);
1268 log_flow_del_message(struct dpif
*dpif
, const struct dpif_flow_del
*del
,
1271 if (should_log_flow_message(error
)) {
1272 log_flow_message(dpif
, error
, "flow_del", del
->key
, del
->key_len
,
1273 !error
? del
->stats
: NULL
, NULL
, 0);
1278 log_execute_message(struct dpif
*dpif
, const struct dpif_execute
*execute
,
1281 if (!(error
? VLOG_DROP_WARN(&error_rl
) : VLOG_DROP_DBG(&dpmsg_rl
))) {
1282 struct ds ds
= DS_EMPTY_INITIALIZER
;
1285 packet
= ofp_packet_to_string(execute
->packet
->data
,
1286 execute
->packet
->size
);
1287 ds_put_format(&ds
, "%s: execute ", dpif_name(dpif
));
1288 format_odp_actions(&ds
, execute
->actions
, execute
->actions_len
);
1290 ds_put_format(&ds
, " failed (%s)", strerror(error
));
1292 ds_put_format(&ds
, " on packet %s", packet
);
1293 vlog(THIS_MODULE
, error
? VLL_WARN
: VLL_DBG
, "%s", ds_cstr(&ds
));