2 * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013 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"
27 #include "dynamic-string.h"
32 #include "ofp-errors.h"
33 #include "ofp-print.h"
37 #include "poll-loop.h"
45 VLOG_DEFINE_THIS_MODULE(dpif);
47 COVERAGE_DEFINE(dpif_destroy);
48 COVERAGE_DEFINE(dpif_port_add);
49 COVERAGE_DEFINE(dpif_port_del);
50 COVERAGE_DEFINE(dpif_flow_flush);
51 COVERAGE_DEFINE(dpif_flow_get);
52 COVERAGE_DEFINE(dpif_flow_put);
53 COVERAGE_DEFINE(dpif_flow_del);
54 COVERAGE_DEFINE(dpif_execute);
55 COVERAGE_DEFINE(dpif_purge);
57 static const struct dpif_class *base_dpif_classes[] = {
62 &dpif_planetlab_class,
65 struct registered_dpif_class {
66 const struct dpif_class *dpif_class;
69 static struct shash dpif_classes = SHASH_INITIALIZER(&dpif_classes);
70 static struct sset dpif_blacklist = SSET_INITIALIZER(&dpif_blacklist);
72 /* Protects 'dpif_classes', including the refcount, and 'dpif_blacklist'. */
73 static struct ovs_mutex dpif_mutex = OVS_MUTEX_INITIALIZER;
75 /* Rate limit for individual messages going to or from the datapath, output at
76 * DBG level. This is very high because, if these are enabled, it is because
77 * we really need to see them. */
78 static struct vlog_rate_limit dpmsg_rl = VLOG_RATE_LIMIT_INIT(600, 600);
80 /* Not really much point in logging many dpif errors. */
81 static struct vlog_rate_limit error_rl = VLOG_RATE_LIMIT_INIT(60, 5);
83 static void log_flow_message(const struct dpif *dpif, int error,
84 const char *operation,
85 const struct nlattr *key, size_t key_len,
86 const struct nlattr *mask, size_t mask_len,
87 const struct dpif_flow_stats *stats,
88 const struct nlattr *actions, size_t actions_len);
89 static void log_operation(const struct dpif *, const char *operation,
91 static bool should_log_flow_message(int error);
92 static void log_flow_put_message(struct dpif *, const struct dpif_flow_put *,
94 static void log_flow_del_message(struct dpif *, const struct dpif_flow_del *,
96 static void log_execute_message(struct dpif *, const struct dpif_execute *,
102 static struct ovsthread_once once = OVSTHREAD_ONCE_INITIALIZER;
104 if (ovsthread_once_start(&once)) {
107 for (i = 0; i < ARRAY_SIZE(base_dpif_classes); i++) {
108 dp_register_provider(base_dpif_classes[i]);
110 ovsthread_once_done(&once);
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 /* Registers a new datapath provider. After successful registration, new
141 * datapaths of that type can be opened using dpif_open(). */
143 dp_register_provider(const struct dpif_class *new_class)
147 ovs_mutex_lock(&dpif_mutex);
148 error = dp_register_provider__(new_class);
149 ovs_mutex_unlock(&dpif_mutex);
154 /* Unregisters a datapath provider. 'type' must have been previously
155 * registered and not currently be in use by any dpifs. After unregistration
156 * new datapaths of that type cannot be opened using dpif_open(). */
158 dp_unregister_provider__(const char *type)
160 struct shash_node *node;
161 struct registered_dpif_class *registered_class;
163 node = shash_find(&dpif_classes, type);
165 VLOG_WARN("attempted to unregister a datapath provider that is not "
166 "registered: %s", type);
170 registered_class = node->data;
171 if (registered_class->refcount) {
172 VLOG_WARN("attempted to unregister in use datapath provider: %s", type);
176 shash_delete(&dpif_classes, node);
177 free(registered_class);
182 /* Unregisters a datapath provider. 'type' must have been previously
183 * registered and not currently be in use by any dpifs. After unregistration
184 * new datapaths of that type cannot be opened using dpif_open(). */
186 dp_unregister_provider(const char *type)
192 ovs_mutex_lock(&dpif_mutex);
193 error = dp_unregister_provider__(type);
194 ovs_mutex_unlock(&dpif_mutex);
199 /* Blacklists a provider. Causes future calls of dp_register_provider() with
200 * a dpif_class which implements 'type' to fail. */
202 dp_blacklist_provider(const char *type)
204 ovs_mutex_lock(&dpif_mutex);
205 sset_add(&dpif_blacklist, type);
206 ovs_mutex_unlock(&dpif_mutex);
209 /* Clears 'types' and enumerates the types of all currently registered datapath
210 * providers into it. The caller must first initialize the sset. */
212 dp_enumerate_types(struct sset *types)
214 struct shash_node *node;
219 ovs_mutex_lock(&dpif_mutex);
220 SHASH_FOR_EACH(node, &dpif_classes) {
221 const struct registered_dpif_class *registered_class = node->data;
222 sset_add(types, registered_class->dpif_class->type);
224 ovs_mutex_unlock(&dpif_mutex);
228 dp_class_unref(struct registered_dpif_class *rc)
230 ovs_mutex_lock(&dpif_mutex);
231 ovs_assert(rc->refcount);
233 ovs_mutex_unlock(&dpif_mutex);
236 static struct registered_dpif_class *
237 dp_class_lookup(const char *type)
239 struct registered_dpif_class *rc;
241 ovs_mutex_lock(&dpif_mutex);
242 rc = shash_find_data(&dpif_classes, type);
246 ovs_mutex_unlock(&dpif_mutex);
251 /* Clears 'names' and enumerates the names of all known created datapaths with
252 * the given 'type'. The caller must first initialize the sset. Returns 0 if
253 * successful, otherwise a positive errno value.
255 * Some kinds of datapaths might not be practically enumerable. This is not
256 * considered an error. */
258 dp_enumerate_names(const char *type, struct sset *names)
260 struct registered_dpif_class *registered_class;
261 const struct dpif_class *dpif_class;
267 registered_class = dp_class_lookup(type);
268 if (!registered_class) {
269 VLOG_WARN("could not enumerate unknown type: %s", type);
273 dpif_class = registered_class->dpif_class;
274 error = dpif_class->enumerate ? dpif_class->enumerate(names) : 0;
276 VLOG_WARN("failed to enumerate %s datapaths: %s", dpif_class->type,
277 ovs_strerror(error));
279 dp_class_unref(registered_class);
284 /* Parses 'datapath_name_', which is of the form [type@]name into its
285 * component pieces. 'name' and 'type' must be freed by the caller.
287 * The returned 'type' is normalized, as if by dpif_normalize_type(). */
289 dp_parse_name(const char *datapath_name_, char **name, char **type)
291 char *datapath_name = xstrdup(datapath_name_);
294 separator = strchr(datapath_name, '@');
297 *type = datapath_name;
298 *name = xstrdup(dpif_normalize_type(separator + 1));
300 *name = datapath_name;
301 *type = xstrdup(dpif_normalize_type(NULL));
306 do_open(const char *name, const char *type, bool create, struct dpif **dpifp)
308 struct dpif *dpif = NULL;
310 struct registered_dpif_class *registered_class;
314 type = dpif_normalize_type(type);
315 registered_class = dp_class_lookup(type);
316 if (!registered_class) {
317 VLOG_WARN("could not create datapath %s of unknown type %s", name,
319 error = EAFNOSUPPORT;
323 error = registered_class->dpif_class->open(registered_class->dpif_class,
324 name, create, &dpif);
326 ovs_assert(dpif->dpif_class == registered_class->dpif_class);
328 dp_class_unref(registered_class);
332 *dpifp = error ? NULL : dpif;
336 /* Tries to open an existing datapath named 'name' and type 'type'. Will fail
337 * if no datapath with 'name' and 'type' exists. 'type' may be either NULL or
338 * the empty string to specify the default system type. Returns 0 if
339 * successful, otherwise a positive errno value. On success stores a pointer
340 * to the datapath in '*dpifp', otherwise a null pointer. */
342 dpif_open(const char *name, const char *type, struct dpif **dpifp)
344 return do_open(name, type, false, dpifp);
347 /* Tries to create and open a new datapath with the given 'name' and 'type'.
348 * 'type' may be either NULL or the empty string to specify the default system
349 * type. Will fail if a datapath with 'name' and 'type' already exists.
350 * Returns 0 if successful, otherwise a positive errno value. On success
351 * stores a pointer to the datapath in '*dpifp', otherwise a null pointer. */
353 dpif_create(const char *name, const char *type, struct dpif **dpifp)
355 return do_open(name, type, true, dpifp);
358 /* Tries to open a datapath with the given 'name' and 'type', creating it if it
359 * does not exist. 'type' may be either NULL or the empty string to specify
360 * the default system type. Returns 0 if successful, otherwise a positive
361 * errno value. On success stores a pointer to the datapath in '*dpifp',
362 * otherwise a null pointer. */
364 dpif_create_and_open(const char *name, const char *type, struct dpif **dpifp)
368 error = dpif_create(name, type, dpifp);
369 if (error == EEXIST || error == EBUSY) {
370 error = dpif_open(name, type, dpifp);
372 VLOG_WARN("datapath %s already exists but cannot be opened: %s",
373 name, ovs_strerror(error));
376 VLOG_WARN("failed to create datapath %s: %s",
377 name, ovs_strerror(error));
382 /* Closes and frees the connection to 'dpif'. Does not destroy the datapath
383 * itself; call dpif_delete() first, instead, if that is desirable. */
385 dpif_close(struct dpif *dpif)
388 struct registered_dpif_class *rc;
390 rc = shash_find_data(&dpif_classes, dpif->dpif_class->type);
391 dpif_uninit(dpif, true);
396 /* Performs periodic work needed by 'dpif'. */
398 dpif_run(struct dpif *dpif)
400 if (dpif->dpif_class->run) {
401 dpif->dpif_class->run(dpif);
405 /* Arranges for poll_block() to wake up when dp_run() needs to be called for
408 dpif_wait(struct dpif *dpif)
410 if (dpif->dpif_class->wait) {
411 dpif->dpif_class->wait(dpif);
415 /* Returns the name of datapath 'dpif' prefixed with the type
416 * (for use in log messages). */
418 dpif_name(const struct dpif *dpif)
420 return dpif->full_name;
423 /* Returns the name of datapath 'dpif' without the type
424 * (for use in device names). */
426 dpif_base_name(const struct dpif *dpif)
428 return dpif->base_name;
431 /* Returns the type of datapath 'dpif'. */
433 dpif_type(const struct dpif *dpif)
435 return dpif->dpif_class->type;
438 /* Returns the fully spelled out name for the given datapath 'type'.
440 * Normalized type string can be compared with strcmp(). Unnormalized type
441 * string might be the same even if they have different spellings. */
443 dpif_normalize_type(const char *type)
445 return type && type[0] ? type : "system";
448 /* Destroys the datapath that 'dpif' is connected to, first removing all of its
449 * ports. After calling this function, it does not make sense to pass 'dpif'
450 * to any functions other than dpif_name() or dpif_close(). */
452 dpif_delete(struct dpif *dpif)
456 COVERAGE_INC(dpif_destroy);
458 error = dpif->dpif_class->destroy(dpif);
459 log_operation(dpif, "delete", error);
463 /* Retrieves statistics for 'dpif' into 'stats'. Returns 0 if successful,
464 * otherwise a positive errno value. */
466 dpif_get_dp_stats(const struct dpif *dpif, struct dpif_dp_stats *stats)
468 int error = dpif->dpif_class->get_stats(dpif, stats);
470 memset(stats, 0, sizeof *stats);
472 log_operation(dpif, "get_stats", error);
477 dpif_port_open_type(const char *datapath_type, const char *port_type)
479 struct registered_dpif_class *rc;
481 datapath_type = dpif_normalize_type(datapath_type);
483 ovs_mutex_lock(&dpif_mutex);
484 rc = shash_find_data(&dpif_classes, datapath_type);
485 if (rc && rc->dpif_class->port_open_type) {
486 port_type = rc->dpif_class->port_open_type(rc->dpif_class, port_type);
488 ovs_mutex_unlock(&dpif_mutex);
493 /* Attempts to add 'netdev' as a port on 'dpif'. If 'port_nop' is
494 * non-null and its value is not ODPP_NONE, then attempts to use the
495 * value as the port number.
497 * If successful, returns 0 and sets '*port_nop' to the new port's port
498 * number (if 'port_nop' is non-null). On failure, returns a positive
499 * errno value and sets '*port_nop' to ODPP_NONE (if 'port_nop' is
502 dpif_port_add(struct dpif *dpif, struct netdev *netdev, odp_port_t *port_nop)
504 const char *netdev_name = netdev_get_name(netdev);
505 odp_port_t port_no = ODPP_NONE;
508 COVERAGE_INC(dpif_port_add);
514 error = dpif->dpif_class->port_add(dpif, netdev, &port_no);
516 VLOG_DBG_RL(&dpmsg_rl, "%s: added %s as port %"PRIu32,
517 dpif_name(dpif), netdev_name, port_no);
519 VLOG_WARN_RL(&error_rl, "%s: failed to add %s as port: %s",
520 dpif_name(dpif), netdev_name, ovs_strerror(error));
529 /* Attempts to remove 'dpif''s port number 'port_no'. Returns 0 if successful,
530 * otherwise a positive errno value. */
532 dpif_port_del(struct dpif *dpif, odp_port_t port_no)
536 COVERAGE_INC(dpif_port_del);
538 error = dpif->dpif_class->port_del(dpif, port_no);
540 VLOG_DBG_RL(&dpmsg_rl, "%s: port_del(%"PRIu32")",
541 dpif_name(dpif), port_no);
543 log_operation(dpif, "port_del", error);
548 /* Makes a deep copy of 'src' into 'dst'. */
550 dpif_port_clone(struct dpif_port *dst, const struct dpif_port *src)
552 dst->name = xstrdup(src->name);
553 dst->type = xstrdup(src->type);
554 dst->port_no = src->port_no;
557 /* Frees memory allocated to members of 'dpif_port'.
559 * Do not call this function on a dpif_port obtained from
560 * dpif_port_dump_next(): that function retains ownership of the data in the
563 dpif_port_destroy(struct dpif_port *dpif_port)
565 free(dpif_port->name);
566 free(dpif_port->type);
569 /* Checks if port named 'devname' exists in 'dpif'. If so, returns
570 * true; otherwise, returns false. */
572 dpif_port_exists(const struct dpif *dpif, const char *devname)
574 int error = dpif->dpif_class->port_query_by_name(dpif, devname, NULL);
575 if (error != 0 && error != ENOENT && error != ENODEV) {
576 VLOG_WARN_RL(&error_rl, "%s: failed to query port %s: %s",
577 dpif_name(dpif), devname, ovs_strerror(error));
583 /* Looks up port number 'port_no' in 'dpif'. On success, returns 0 and
584 * initializes '*port' appropriately; on failure, returns a positive errno
587 * The caller owns the data in 'port' and must free it with
588 * dpif_port_destroy() when it is no longer needed. */
590 dpif_port_query_by_number(const struct dpif *dpif, odp_port_t port_no,
591 struct dpif_port *port)
593 int error = dpif->dpif_class->port_query_by_number(dpif, port_no, port);
595 VLOG_DBG_RL(&dpmsg_rl, "%s: port %"PRIu32" is device %s",
596 dpif_name(dpif), port_no, port->name);
598 memset(port, 0, sizeof *port);
599 VLOG_WARN_RL(&error_rl, "%s: failed to query port %"PRIu32": %s",
600 dpif_name(dpif), port_no, ovs_strerror(error));
605 /* Looks up port named 'devname' in 'dpif'. On success, returns 0 and
606 * initializes '*port' appropriately; on failure, returns a positive errno
609 * The caller owns the data in 'port' and must free it with
610 * dpif_port_destroy() when it is no longer needed. */
612 dpif_port_query_by_name(const struct dpif *dpif, const char *devname,
613 struct dpif_port *port)
615 int error = dpif->dpif_class->port_query_by_name(dpif, devname, port);
617 VLOG_DBG_RL(&dpmsg_rl, "%s: device %s is on port %"PRIu32,
618 dpif_name(dpif), devname, port->port_no);
620 memset(port, 0, sizeof *port);
622 /* For ENOENT or ENODEV we use DBG level because the caller is probably
623 * interested in whether 'dpif' actually has a port 'devname', so that
624 * it's not an issue worth logging if it doesn't. Other errors are
625 * uncommon and more likely to indicate a real problem. */
627 error == ENOENT || error == ENODEV ? VLL_DBG : VLL_WARN,
628 "%s: failed to query port %s: %s",
629 dpif_name(dpif), devname, ovs_strerror(error));
634 /* Returns one greater than the maximum port number accepted in flow
637 dpif_get_max_ports(const struct dpif *dpif)
639 return dpif->dpif_class->get_max_ports(dpif);
642 /* Returns the Netlink PID value to supply in OVS_ACTION_ATTR_USERSPACE actions
643 * as the OVS_USERSPACE_ATTR_PID attribute's value, for use in flows whose
644 * packets arrived on port 'port_no'.
646 * A 'port_no' of ODPP_NONE is a special case: it returns a reserved PID, not
647 * allocated to any port, that the client may use for special purposes.
649 * The return value is only meaningful when DPIF_UC_ACTION has been enabled in
650 * the 'dpif''s listen mask. It is allowed to change when DPIF_UC_ACTION is
651 * disabled and then re-enabled, so a client that does that must be prepared to
652 * update all of the flows that it installed that contain
653 * OVS_ACTION_ATTR_USERSPACE actions. */
655 dpif_port_get_pid(const struct dpif *dpif, odp_port_t port_no)
657 return (dpif->dpif_class->port_get_pid
658 ? (dpif->dpif_class->port_get_pid)(dpif, port_no)
662 /* Looks up port number 'port_no' in 'dpif'. On success, returns 0 and copies
663 * the port's name into the 'name_size' bytes in 'name', ensuring that the
664 * result is null-terminated. On failure, returns a positive errno value and
665 * makes 'name' the empty string. */
667 dpif_port_get_name(struct dpif *dpif, odp_port_t port_no,
668 char *name, size_t name_size)
670 struct dpif_port port;
673 ovs_assert(name_size > 0);
675 error = dpif_port_query_by_number(dpif, port_no, &port);
677 ovs_strlcpy(name, port.name, name_size);
678 dpif_port_destroy(&port);
685 /* Initializes 'dump' to begin dumping the ports in a dpif.
687 * This function provides no status indication. An error status for the entire
688 * dump operation is provided when it is completed by calling
689 * dpif_port_dump_done().
692 dpif_port_dump_start(struct dpif_port_dump *dump, const struct dpif *dpif)
695 dump->error = dpif->dpif_class->port_dump_start(dpif, &dump->state);
696 log_operation(dpif, "port_dump_start", dump->error);
699 /* Attempts to retrieve another port from 'dump', which must have been
700 * initialized with dpif_port_dump_start(). On success, stores a new dpif_port
701 * into 'port' and returns true. On failure, returns false.
703 * Failure might indicate an actual error or merely that the last port has been
704 * dumped. An error status for the entire dump operation is provided when it
705 * is completed by calling dpif_port_dump_done().
707 * The dpif owns the data stored in 'port'. It will remain valid until at
708 * least the next time 'dump' is passed to dpif_port_dump_next() or
709 * dpif_port_dump_done(). */
711 dpif_port_dump_next(struct dpif_port_dump *dump, struct dpif_port *port)
713 const struct dpif *dpif = dump->dpif;
719 dump->error = dpif->dpif_class->port_dump_next(dpif, dump->state, port);
720 if (dump->error == EOF) {
721 VLOG_DBG_RL(&dpmsg_rl, "%s: dumped all ports", dpif_name(dpif));
723 log_operation(dpif, "port_dump_next", dump->error);
727 dpif->dpif_class->port_dump_done(dpif, dump->state);
733 /* Completes port table dump operation 'dump', which must have been initialized
734 * with dpif_port_dump_start(). Returns 0 if the dump operation was
735 * error-free, otherwise a positive errno value describing the problem. */
737 dpif_port_dump_done(struct dpif_port_dump *dump)
739 const struct dpif *dpif = dump->dpif;
741 dump->error = dpif->dpif_class->port_dump_done(dpif, dump->state);
742 log_operation(dpif, "port_dump_done", dump->error);
744 return dump->error == EOF ? 0 : dump->error;
747 /* Polls for changes in the set of ports in 'dpif'. If the set of ports in
748 * 'dpif' has changed, this function does one of the following:
750 * - Stores the name of the device that was added to or deleted from 'dpif' in
751 * '*devnamep' and returns 0. The caller is responsible for freeing
752 * '*devnamep' (with free()) when it no longer needs it.
754 * - Returns ENOBUFS and sets '*devnamep' to NULL.
756 * This function may also return 'false positives', where it returns 0 and
757 * '*devnamep' names a device that was not actually added or deleted or it
758 * returns ENOBUFS without any change.
760 * Returns EAGAIN if the set of ports in 'dpif' has not changed. May also
761 * return other positive errno values to indicate that something has gone
764 dpif_port_poll(const struct dpif *dpif, char **devnamep)
766 int error = dpif->dpif_class->port_poll(dpif, devnamep);
773 /* Arranges for the poll loop to wake up when port_poll(dpif) will return a
774 * value other than EAGAIN. */
776 dpif_port_poll_wait(const struct dpif *dpif)
778 dpif->dpif_class->port_poll_wait(dpif);
781 /* Extracts the flow stats for a packet. The 'flow' and 'packet'
782 * arguments must have been initialized through a call to flow_extract().
783 * 'used' is stored into stats->used. */
785 dpif_flow_stats_extract(const struct flow *flow, const struct ofpbuf *packet,
786 long long int used, struct dpif_flow_stats *stats)
788 stats->tcp_flags = packet_get_tcp_flags(packet, flow);
789 stats->n_bytes = packet->size;
790 stats->n_packets = 1;
794 /* Appends a human-readable representation of 'stats' to 's'. */
796 dpif_flow_stats_format(const struct dpif_flow_stats *stats, struct ds *s)
798 ds_put_format(s, "packets:%"PRIu64", bytes:%"PRIu64", used:",
799 stats->n_packets, stats->n_bytes);
801 ds_put_format(s, "%.3fs", (time_msec() - stats->used) / 1000.0);
803 ds_put_format(s, "never");
805 if (stats->tcp_flags) {
806 ds_put_cstr(s, ", flags:");
807 packet_format_tcp_flags(s, stats->tcp_flags);
811 /* Deletes all flows from 'dpif'. Returns 0 if successful, otherwise a
812 * positive errno value. */
814 dpif_flow_flush(struct dpif *dpif)
818 COVERAGE_INC(dpif_flow_flush);
820 error = dpif->dpif_class->flow_flush(dpif);
821 log_operation(dpif, "flow_flush", error);
825 /* Queries 'dpif' for a flow entry. The flow is specified by the Netlink
826 * attributes with types OVS_KEY_ATTR_* in the 'key_len' bytes starting at
829 * Returns 0 if successful. If no flow matches, returns ENOENT. On other
830 * failure, returns a positive errno value.
832 * If 'actionsp' is nonnull, then on success '*actionsp' will be set to an
833 * ofpbuf owned by the caller that contains the Netlink attributes for the
834 * flow's actions. The caller must free the ofpbuf (with ofpbuf_delete()) when
835 * it is no longer needed.
837 * If 'stats' is nonnull, then on success it will be updated with the flow's
840 dpif_flow_get(const struct dpif *dpif,
841 const struct nlattr *key, size_t key_len,
842 struct ofpbuf **actionsp, struct dpif_flow_stats *stats)
846 COVERAGE_INC(dpif_flow_get);
848 error = dpif->dpif_class->flow_get(dpif, key, key_len, actionsp, stats);
854 memset(stats, 0, sizeof *stats);
857 if (should_log_flow_message(error)) {
858 const struct nlattr *actions;
861 if (!error && actionsp) {
862 actions = (*actionsp)->data;
863 actions_len = (*actionsp)->size;
868 log_flow_message(dpif, error, "flow_get", key, key_len,
869 NULL, 0, stats, actions, actions_len);
875 dpif_flow_put__(struct dpif *dpif, const struct dpif_flow_put *put)
879 COVERAGE_INC(dpif_flow_put);
880 ovs_assert(!(put->flags & ~(DPIF_FP_CREATE | DPIF_FP_MODIFY
881 | DPIF_FP_ZERO_STATS)));
883 error = dpif->dpif_class->flow_put(dpif, put);
884 if (error && put->stats) {
885 memset(put->stats, 0, sizeof *put->stats);
887 log_flow_put_message(dpif, put, error);
891 /* Adds or modifies a flow in 'dpif'. The flow is specified by the Netlink
892 * attribute OVS_FLOW_ATTR_KEY with types OVS_KEY_ATTR_* in the 'key_len' bytes
893 * starting at 'key', and OVS_FLOW_ATTR_MASK with types of OVS_KEY_ATTR_* in the
894 * 'mask_len' bytes starting at 'mask'. The associated actions are specified by
895 * the Netlink attributes with types OVS_ACTION_ATTR_* in the 'actions_len'
896 * bytes starting at 'actions'.
898 * - If the flow's key does not exist in 'dpif', then the flow will be added if
899 * 'flags' includes DPIF_FP_CREATE. Otherwise the operation will fail with
902 * If the operation succeeds, then 'stats', if nonnull, will be zeroed.
904 * - If the flow's key does exist in 'dpif', then the flow's actions will be
905 * updated if 'flags' includes DPIF_FP_MODIFY. Otherwise the operation will
906 * fail with EEXIST. If the flow's actions are updated, then its statistics
907 * will be zeroed if 'flags' includes DPIF_FP_ZERO_STATS, and left as-is
910 * If the operation succeeds, then 'stats', if nonnull, will be set to the
911 * flow's statistics before the update.
914 dpif_flow_put(struct dpif *dpif, enum dpif_flow_put_flags flags,
915 const struct nlattr *key, size_t key_len,
916 const struct nlattr *mask, size_t mask_len,
917 const struct nlattr *actions, size_t actions_len,
918 struct dpif_flow_stats *stats)
920 struct dpif_flow_put put;
924 put.key_len = key_len;
926 put.mask_len = mask_len;
927 put.actions = actions;
928 put.actions_len = actions_len;
930 return dpif_flow_put__(dpif, &put);
934 dpif_flow_del__(struct dpif *dpif, struct dpif_flow_del *del)
938 COVERAGE_INC(dpif_flow_del);
940 error = dpif->dpif_class->flow_del(dpif, del);
941 if (error && del->stats) {
942 memset(del->stats, 0, sizeof *del->stats);
944 log_flow_del_message(dpif, del, error);
948 /* Deletes a flow from 'dpif' and returns 0, or returns ENOENT if 'dpif' does
949 * not contain such a flow. The flow is specified by the Netlink attributes
950 * with types OVS_KEY_ATTR_* in the 'key_len' bytes starting at 'key'.
952 * If the operation succeeds, then 'stats', if nonnull, will be set to the
953 * flow's statistics before its deletion. */
955 dpif_flow_del(struct dpif *dpif,
956 const struct nlattr *key, size_t key_len,
957 struct dpif_flow_stats *stats)
959 struct dpif_flow_del del;
962 del.key_len = key_len;
964 return dpif_flow_del__(dpif, &del);
967 /* Initializes 'dump' to begin dumping the flows in a dpif.
969 * This function provides no status indication. An error status for the entire
970 * dump operation is provided when it is completed by calling
971 * dpif_flow_dump_done().
974 dpif_flow_dump_start(struct dpif_flow_dump *dump, const struct dpif *dpif)
977 dump->error = dpif->dpif_class->flow_dump_start(dpif, &dump->state);
978 log_operation(dpif, "flow_dump_start", dump->error);
981 /* Attempts to retrieve another flow from 'dump', which must have been
982 * initialized with dpif_flow_dump_start(). On success, updates the output
983 * parameters as described below and returns true. Otherwise, returns false.
984 * Failure might indicate an actual error or merely the end of the flow table.
985 * An error status for the entire dump operation is provided when it is
986 * completed by calling dpif_flow_dump_done().
988 * On success, if 'key' and 'key_len' are nonnull then '*key' and '*key_len'
989 * will be set to Netlink attributes with types OVS_KEY_ATTR_* representing the
990 * dumped flow's key. If 'actions' and 'actions_len' are nonnull then they are
991 * set to Netlink attributes with types OVS_ACTION_ATTR_* representing the
992 * dumped flow's actions. If 'stats' is nonnull then it will be set to the
993 * dumped flow's statistics.
995 * All of the returned data is owned by 'dpif', not by the caller, and the
996 * caller must not modify or free it. 'dpif' guarantees that it remains
997 * accessible and unchanging until at least the next call to 'flow_dump_next'
998 * or 'flow_dump_done' for 'dump'. */
1000 dpif_flow_dump_next(struct dpif_flow_dump *dump,
1001 const struct nlattr **key, size_t *key_len,
1002 const struct nlattr **mask, size_t *mask_len,
1003 const struct nlattr **actions, size_t *actions_len,
1004 const struct dpif_flow_stats **stats)
1006 const struct dpif *dpif = dump->dpif;
1007 int error = dump->error;
1010 error = dpif->dpif_class->flow_dump_next(dpif, dump->state,
1013 actions, actions_len,
1016 dpif->dpif_class->flow_dump_done(dpif, dump->state);
1038 VLOG_DBG_RL(&dpmsg_rl, "%s: dumped all flows", dpif_name(dpif));
1039 } else if (should_log_flow_message(error)) {
1040 log_flow_message(dpif, error, "flow_dump",
1041 key ? *key : NULL, key ? *key_len : 0,
1042 mask ? *mask : NULL, mask ? *mask_len : 0,
1043 stats ? *stats : NULL, actions ? *actions : NULL,
1044 actions ? *actions_len : 0);
1047 dump->error = error;
1051 /* Completes flow table dump operation 'dump', which must have been initialized
1052 * with dpif_flow_dump_start(). Returns 0 if the dump operation was
1053 * error-free, otherwise a positive errno value describing the problem. */
1055 dpif_flow_dump_done(struct dpif_flow_dump *dump)
1057 const struct dpif *dpif = dump->dpif;
1059 dump->error = dpif->dpif_class->flow_dump_done(dpif, dump->state);
1060 log_operation(dpif, "flow_dump_done", dump->error);
1062 return dump->error == EOF ? 0 : dump->error;
1066 dpif_execute__(struct dpif *dpif, const struct dpif_execute *execute)
1070 COVERAGE_INC(dpif_execute);
1071 if (execute->actions_len > 0) {
1072 error = dpif->dpif_class->execute(dpif, execute);
1077 log_execute_message(dpif, execute, error);
1082 /* Causes 'dpif' to perform the 'actions_len' bytes of actions in 'actions' on
1083 * the Ethernet frame specified in 'packet' taken from the flow specified in
1084 * the 'key_len' bytes of 'key'. ('key' is mostly redundant with 'packet', but
1085 * it contains some metadata that cannot be recovered from 'packet', such as
1086 * tunnel and in_port.)
1088 * Returns 0 if successful, otherwise a positive errno value. */
1090 dpif_execute(struct dpif *dpif,
1091 const struct nlattr *key, size_t key_len,
1092 const struct nlattr *actions, size_t actions_len,
1093 const struct ofpbuf *buf)
1095 struct dpif_execute execute;
1098 execute.key_len = key_len;
1099 execute.actions = actions;
1100 execute.actions_len = actions_len;
1101 execute.packet = buf;
1102 return dpif_execute__(dpif, &execute);
1105 /* Executes each of the 'n_ops' operations in 'ops' on 'dpif', in the order in
1106 * which they are specified, placing each operation's results in the "output"
1107 * members documented in comments.
1109 * This function exists because some datapaths can perform batched operations
1110 * faster than individual operations. */
1112 dpif_operate(struct dpif *dpif, struct dpif_op **ops, size_t n_ops)
1116 if (dpif->dpif_class->operate) {
1117 dpif->dpif_class->operate(dpif, ops, n_ops);
1119 for (i = 0; i < n_ops; i++) {
1120 struct dpif_op *op = ops[i];
1123 case DPIF_OP_FLOW_PUT:
1124 log_flow_put_message(dpif, &op->u.flow_put, op->error);
1127 case DPIF_OP_FLOW_DEL:
1128 log_flow_del_message(dpif, &op->u.flow_del, op->error);
1131 case DPIF_OP_EXECUTE:
1132 log_execute_message(dpif, &op->u.execute, op->error);
1139 for (i = 0; i < n_ops; i++) {
1140 struct dpif_op *op = ops[i];
1143 case DPIF_OP_FLOW_PUT:
1144 op->error = dpif_flow_put__(dpif, &op->u.flow_put);
1147 case DPIF_OP_FLOW_DEL:
1148 op->error = dpif_flow_del__(dpif, &op->u.flow_del);
1151 case DPIF_OP_EXECUTE:
1152 op->error = dpif_execute__(dpif, &op->u.execute);
1162 /* Returns a string that represents 'type', for use in log messages. */
1164 dpif_upcall_type_to_string(enum dpif_upcall_type type)
1167 case DPIF_UC_MISS: return "miss";
1168 case DPIF_UC_ACTION: return "action";
1169 case DPIF_N_UC_TYPES: default: return "<unknown>";
1173 /* Enables or disables receiving packets with dpif_recv() on 'dpif'. Returns 0
1174 * if successful, otherwise a positive errno value.
1176 * Turning packet receive off and then back on may change the Netlink PID
1177 * assignments returned by dpif_port_get_pid(). If the client does this, it
1178 * must update all of the flows that have OVS_ACTION_ATTR_USERSPACE actions
1179 * using the new PID assignment. */
1181 dpif_recv_set(struct dpif *dpif, bool enable)
1183 int error = dpif->dpif_class->recv_set(dpif, enable);
1184 log_operation(dpif, "recv_set", error);
1188 /* Polls for an upcall from 'dpif'. If successful, stores the upcall into
1189 * '*upcall', using 'buf' for storage. Should only be called if
1190 * dpif_recv_set() has been used to enable receiving packets on 'dpif'.
1192 * 'upcall->packet' and 'upcall->key' point into data in the caller-provided
1193 * 'buf', so their memory cannot be freed separately from 'buf'. (This is
1194 * hardly a great way to do things but it works out OK for the dpif providers
1195 * and clients that exist so far.)
1197 * Returns 0 if successful, otherwise a positive errno value. Returns EAGAIN
1198 * if no upcall is immediately available. */
1200 dpif_recv(struct dpif *dpif, struct dpif_upcall *upcall, struct ofpbuf *buf)
1202 int error = dpif->dpif_class->recv(dpif, upcall, buf);
1203 if (!error && !VLOG_DROP_DBG(&dpmsg_rl)) {
1207 packet = ofp_packet_to_string(upcall->packet->data,
1208 upcall->packet->size);
1211 odp_flow_key_format(upcall->key, upcall->key_len, &flow);
1213 VLOG_DBG("%s: %s upcall:\n%s\n%s",
1214 dpif_name(dpif), dpif_upcall_type_to_string(upcall->type),
1215 ds_cstr(&flow), packet);
1219 } else if (error && error != EAGAIN) {
1220 log_operation(dpif, "recv", error);
1225 /* Discards all messages that would otherwise be received by dpif_recv() on
1228 dpif_recv_purge(struct dpif *dpif)
1230 COVERAGE_INC(dpif_purge);
1231 if (dpif->dpif_class->recv_purge) {
1232 dpif->dpif_class->recv_purge(dpif);
1236 /* Arranges for the poll loop to wake up when 'dpif' has a message queued to be
1237 * received with dpif_recv(). */
1239 dpif_recv_wait(struct dpif *dpif)
1241 dpif->dpif_class->recv_wait(dpif);
1244 /* Obtains the NetFlow engine type and engine ID for 'dpif' into '*engine_type'
1245 * and '*engine_id', respectively. */
1247 dpif_get_netflow_ids(const struct dpif *dpif,
1248 uint8_t *engine_type, uint8_t *engine_id)
1250 *engine_type = dpif->netflow_engine_type;
1251 *engine_id = dpif->netflow_engine_id;
1254 /* Translates OpenFlow queue ID 'queue_id' (in host byte order) into a priority
1255 * value used for setting packet priority.
1256 * On success, returns 0 and stores the priority into '*priority'.
1257 * On failure, returns a positive errno value and stores 0 into '*priority'. */
1259 dpif_queue_to_priority(const struct dpif *dpif, uint32_t queue_id,
1262 int error = (dpif->dpif_class->queue_to_priority
1263 ? dpif->dpif_class->queue_to_priority(dpif, queue_id,
1269 log_operation(dpif, "queue_to_priority", error);
1274 dpif_init(struct dpif *dpif, const struct dpif_class *dpif_class,
1276 uint8_t netflow_engine_type, uint8_t netflow_engine_id)
1278 dpif->dpif_class = dpif_class;
1279 dpif->base_name = xstrdup(name);
1280 dpif->full_name = xasprintf("%s@%s", dpif_class->type, name);
1281 dpif->netflow_engine_type = netflow_engine_type;
1282 dpif->netflow_engine_id = netflow_engine_id;
1285 /* Undoes the results of initialization.
1287 * Normally this function only needs to be called from dpif_close().
1288 * However, it may be called by providers due to an error on opening
1289 * that occurs after initialization. It this case dpif_close() would
1290 * never be called. */
1292 dpif_uninit(struct dpif *dpif, bool close)
1294 char *base_name = dpif->base_name;
1295 char *full_name = dpif->full_name;
1298 dpif->dpif_class->close(dpif);
1306 log_operation(const struct dpif *dpif, const char *operation, int error)
1309 VLOG_DBG_RL(&dpmsg_rl, "%s: %s success", dpif_name(dpif), operation);
1310 } else if (ofperr_is_valid(error)) {
1311 VLOG_WARN_RL(&error_rl, "%s: %s failed (%s)",
1312 dpif_name(dpif), operation, ofperr_get_name(error));
1314 VLOG_WARN_RL(&error_rl, "%s: %s failed (%s)",
1315 dpif_name(dpif), operation, ovs_strerror(error));
1319 static enum vlog_level
1320 flow_message_log_level(int error)
1322 /* If flows arrive in a batch, userspace may push down multiple
1323 * unique flow definitions that overlap when wildcards are applied.
1324 * Kernels that support flow wildcarding will reject these flows as
1325 * duplicates (EEXIST), so lower the log level to debug for these
1326 * types of messages. */
1327 return (error && error != EEXIST) ? VLL_WARN : VLL_DBG;
1331 should_log_flow_message(int error)
1333 return !vlog_should_drop(THIS_MODULE, flow_message_log_level(error),
1334 error ? &error_rl : &dpmsg_rl);
1338 log_flow_message(const struct dpif *dpif, int error, const char *operation,
1339 const struct nlattr *key, size_t key_len,
1340 const struct nlattr *mask, size_t mask_len,
1341 const struct dpif_flow_stats *stats,
1342 const struct nlattr *actions, size_t actions_len)
1344 struct ds ds = DS_EMPTY_INITIALIZER;
1345 ds_put_format(&ds, "%s: ", dpif_name(dpif));
1347 ds_put_cstr(&ds, "failed to ");
1349 ds_put_format(&ds, "%s ", operation);
1351 ds_put_format(&ds, "(%s) ", ovs_strerror(error));
1353 odp_flow_format(key, key_len, mask, mask_len, NULL, &ds, true);
1355 ds_put_cstr(&ds, ", ");
1356 dpif_flow_stats_format(stats, &ds);
1358 if (actions || actions_len) {
1359 ds_put_cstr(&ds, ", actions:");
1360 format_odp_actions(&ds, actions, actions_len);
1362 vlog(THIS_MODULE, flow_message_log_level(error), "%s", ds_cstr(&ds));
1367 log_flow_put_message(struct dpif *dpif, const struct dpif_flow_put *put,
1370 if (should_log_flow_message(error)) {
1374 ds_put_cstr(&s, "put");
1375 if (put->flags & DPIF_FP_CREATE) {
1376 ds_put_cstr(&s, "[create]");
1378 if (put->flags & DPIF_FP_MODIFY) {
1379 ds_put_cstr(&s, "[modify]");
1381 if (put->flags & DPIF_FP_ZERO_STATS) {
1382 ds_put_cstr(&s, "[zero]");
1384 log_flow_message(dpif, error, ds_cstr(&s),
1385 put->key, put->key_len, put->mask, put->mask_len,
1386 put->stats, put->actions, put->actions_len);
1392 log_flow_del_message(struct dpif *dpif, const struct dpif_flow_del *del,
1395 if (should_log_flow_message(error)) {
1396 log_flow_message(dpif, error, "flow_del", del->key, del->key_len,
1397 NULL, 0, !error ? del->stats : NULL, NULL, 0);
1402 log_execute_message(struct dpif *dpif, const struct dpif_execute *execute,
1405 if (!(error ? VLOG_DROP_WARN(&error_rl) : VLOG_DROP_DBG(&dpmsg_rl))) {
1406 struct ds ds = DS_EMPTY_INITIALIZER;
1409 packet = ofp_packet_to_string(execute->packet->data,
1410 execute->packet->size);
1411 ds_put_format(&ds, "%s: execute ", dpif_name(dpif));
1412 format_odp_actions(&ds, execute->actions, execute->actions_len);
1414 ds_put_format(&ds, " failed (%s)", ovs_strerror(error));
1416 ds_put_format(&ds, " on packet %s", packet);
1417 vlog(THIS_MODULE, error ? VLL_WARN : VLL_DBG, "%s", ds_cstr(&ds));