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"
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_flow_query_list);
55 COVERAGE_DEFINE(dpif_flow_query_list_n);
56 COVERAGE_DEFINE(dpif_execute);
57 COVERAGE_DEFINE(dpif_purge);
59 static const struct dpif_class *base_dpif_classes[] = {
66 struct registered_dpif_class {
67 const struct dpif_class *dpif_class;
70 static struct shash dpif_classes = SHASH_INITIALIZER(&dpif_classes);
71 static struct sset dpif_blacklist = SSET_INITIALIZER(&dpif_blacklist);
73 /* Rate limit for individual messages going to or from the datapath, output at
74 * DBG level. This is very high because, if these are enabled, it is because
75 * we really need to see them. */
76 static struct vlog_rate_limit dpmsg_rl = VLOG_RATE_LIMIT_INIT(600, 600);
78 /* Not really much point in logging many dpif errors. */
79 static struct vlog_rate_limit error_rl = VLOG_RATE_LIMIT_INIT(60, 5);
81 static void log_flow_message(const struct dpif *dpif, int error,
82 const char *operation,
83 const struct nlattr *key, size_t key_len,
84 const struct dpif_flow_stats *stats,
85 const struct nlattr *actions, size_t actions_len);
86 static void log_operation(const struct dpif *, const char *operation,
88 static bool should_log_flow_message(int error);
89 static void log_flow_put_message(struct dpif *, const struct dpif_flow_put *,
91 static void log_flow_del_message(struct dpif *, const struct dpif_flow_del *,
93 static void log_execute_message(struct dpif *, const struct dpif_execute *,
99 static int status = -1;
105 for (i = 0; i < ARRAY_SIZE(base_dpif_classes); i++) {
106 dp_register_provider(base_dpif_classes[i]);
111 /* Registers a new datapath provider. After successful registration, new
112 * datapaths of that type can be opened using dpif_open(). */
114 dp_register_provider(const struct dpif_class *new_class)
116 struct registered_dpif_class *registered_class;
118 if (sset_contains(&dpif_blacklist, new_class->type)) {
119 VLOG_DBG("attempted to register blacklisted provider: %s",
124 if (shash_find(&dpif_classes, new_class->type)) {
125 VLOG_WARN("attempted to register duplicate datapath provider: %s",
130 registered_class = xmalloc(sizeof *registered_class);
131 registered_class->dpif_class = new_class;
132 registered_class->refcount = 0;
134 shash_add(&dpif_classes, new_class->type, registered_class);
139 /* Unregisters a datapath provider. 'type' must have been previously
140 * registered and not currently be in use by any dpifs. After unregistration
141 * new datapaths of that type cannot be opened using dpif_open(). */
143 dp_unregister_provider(const char *type)
145 struct shash_node *node;
146 struct registered_dpif_class *registered_class;
148 node = shash_find(&dpif_classes, type);
150 VLOG_WARN("attempted to unregister a datapath provider that is not "
151 "registered: %s", type);
155 registered_class = node->data;
156 if (registered_class->refcount) {
157 VLOG_WARN("attempted to unregister in use datapath provider: %s", type);
161 shash_delete(&dpif_classes, node);
162 free(registered_class);
167 /* Blacklists a provider. Causes future calls of dp_register_provider() with
168 * a dpif_class which implements 'type' to fail. */
170 dp_blacklist_provider(const char *type)
172 sset_add(&dpif_blacklist, type);
175 /* Clears 'types' and enumerates the types of all currently registered datapath
176 * providers into it. The caller must first initialize the sset. */
178 dp_enumerate_types(struct sset *types)
180 struct shash_node *node;
185 SHASH_FOR_EACH(node, &dpif_classes) {
186 const struct registered_dpif_class *registered_class = node->data;
187 sset_add(types, registered_class->dpif_class->type);
191 /* Clears 'names' and enumerates the names of all known created datapaths with
192 * the given 'type'. The caller must first initialize the sset. Returns 0 if
193 * successful, otherwise a positive errno value.
195 * Some kinds of datapaths might not be practically enumerable. This is not
196 * considered an error. */
198 dp_enumerate_names(const char *type, struct sset *names)
200 const struct registered_dpif_class *registered_class;
201 const struct dpif_class *dpif_class;
207 registered_class = shash_find_data(&dpif_classes, type);
208 if (!registered_class) {
209 VLOG_WARN("could not enumerate unknown type: %s", type);
213 dpif_class = registered_class->dpif_class;
214 error = dpif_class->enumerate ? dpif_class->enumerate(names) : 0;
217 VLOG_WARN("failed to enumerate %s datapaths: %s", dpif_class->type,
224 /* Parses 'datapath_name_', which is of the form [type@]name into its
225 * component pieces. 'name' and 'type' must be freed by the caller.
227 * The returned 'type' is normalized, as if by dpif_normalize_type(). */
229 dp_parse_name(const char *datapath_name_, char **name, char **type)
231 char *datapath_name = xstrdup(datapath_name_);
234 separator = strchr(datapath_name, '@');
237 *type = datapath_name;
238 *name = xstrdup(dpif_normalize_type(separator + 1));
240 *name = datapath_name;
241 *type = xstrdup(dpif_normalize_type(NULL));
246 do_open(const char *name, const char *type, bool create, struct dpif **dpifp)
248 struct dpif *dpif = NULL;
250 struct registered_dpif_class *registered_class;
254 type = dpif_normalize_type(type);
256 registered_class = shash_find_data(&dpif_classes, type);
257 if (!registered_class) {
258 VLOG_WARN("could not create datapath %s of unknown type %s", name,
260 error = EAFNOSUPPORT;
264 error = registered_class->dpif_class->open(registered_class->dpif_class,
265 name, create, &dpif);
267 ovs_assert(dpif->dpif_class == registered_class->dpif_class);
268 registered_class->refcount++;
272 *dpifp = error ? NULL : dpif;
276 /* Tries to open an existing datapath named 'name' and type 'type'. Will fail
277 * if no datapath with 'name' and 'type' exists. 'type' may be either NULL or
278 * the empty string to specify the default system type. Returns 0 if
279 * successful, otherwise a positive errno value. On success stores a pointer
280 * to the datapath in '*dpifp', otherwise a null pointer. */
282 dpif_open(const char *name, const char *type, struct dpif **dpifp)
284 return do_open(name, type, false, dpifp);
287 /* Tries to create and open a new datapath with the given 'name' and 'type'.
288 * 'type' may be either NULL or the empty string to specify the default system
289 * type. Will fail if a datapath with 'name' and 'type' already exists.
290 * Returns 0 if successful, otherwise a positive errno value. On success
291 * stores a pointer to the datapath in '*dpifp', otherwise a null pointer. */
293 dpif_create(const char *name, const char *type, struct dpif **dpifp)
295 return do_open(name, type, true, dpifp);
298 /* Tries to open a datapath with the given 'name' and 'type', creating it if it
299 * does not exist. 'type' may be either NULL or the empty string to specify
300 * the default system type. Returns 0 if successful, otherwise a positive
301 * errno value. On success stores a pointer to the datapath in '*dpifp',
302 * otherwise a null pointer. */
304 dpif_create_and_open(const char *name, const char *type, struct dpif **dpifp)
308 error = dpif_create(name, type, dpifp);
309 if (error == EEXIST || error == EBUSY) {
310 error = dpif_open(name, type, dpifp);
312 VLOG_WARN("datapath %s already exists but cannot be opened: %s",
313 name, strerror(error));
316 VLOG_WARN("failed to create datapath %s: %s", name, strerror(error));
321 /* Closes and frees the connection to 'dpif'. Does not destroy the datapath
322 * itself; call dpif_delete() first, instead, if that is desirable. */
324 dpif_close(struct dpif *dpif)
327 struct registered_dpif_class *registered_class;
329 registered_class = shash_find_data(&dpif_classes,
330 dpif->dpif_class->type);
331 ovs_assert(registered_class);
332 ovs_assert(registered_class->refcount);
334 registered_class->refcount--;
335 dpif_uninit(dpif, true);
339 /* Performs periodic work needed by 'dpif'. */
341 dpif_run(struct dpif *dpif)
343 if (dpif->dpif_class->run) {
344 dpif->dpif_class->run(dpif);
348 /* Arranges for poll_block() to wake up when dp_run() needs to be called for
351 dpif_wait(struct dpif *dpif)
353 if (dpif->dpif_class->wait) {
354 dpif->dpif_class->wait(dpif);
358 /* Returns the name of datapath 'dpif' prefixed with the type
359 * (for use in log messages). */
361 dpif_name(const struct dpif *dpif)
363 return dpif->full_name;
366 /* Returns the name of datapath 'dpif' without the type
367 * (for use in device names). */
369 dpif_base_name(const struct dpif *dpif)
371 return dpif->base_name;
374 /* Returns the type of datapath 'dpif'. */
376 dpif_type(const struct dpif *dpif)
378 return dpif->dpif_class->type;
381 /* Returns the fully spelled out name for the given datapath 'type'.
383 * Normalized type string can be compared with strcmp(). Unnormalized type
384 * string might be the same even if they have different spellings. */
386 dpif_normalize_type(const char *type)
388 return type && type[0] ? type : "system";
391 /* Destroys the datapath that 'dpif' is connected to, first removing all of its
392 * ports. After calling this function, it does not make sense to pass 'dpif'
393 * to any functions other than dpif_name() or dpif_close(). */
395 dpif_delete(struct dpif *dpif)
399 COVERAGE_INC(dpif_destroy);
401 error = dpif->dpif_class->destroy(dpif);
402 log_operation(dpif, "delete", error);
406 /* Retrieves statistics for 'dpif' into 'stats'. Returns 0 if successful,
407 * otherwise a positive errno value. */
409 dpif_get_dp_stats(const struct dpif *dpif, struct dpif_dp_stats *stats)
411 int error = dpif->dpif_class->get_stats(dpif, stats);
413 memset(stats, 0, sizeof *stats);
415 log_operation(dpif, "get_stats", error);
420 dpif_port_open_type(const char *datapath_type, const char *port_type)
422 struct registered_dpif_class *registered_class;
424 datapath_type = dpif_normalize_type(datapath_type);
426 registered_class = shash_find_data(&dpif_classes, datapath_type);
427 if (!registered_class
428 || !registered_class->dpif_class->port_open_type) {
432 return registered_class->dpif_class->port_open_type(
433 registered_class->dpif_class, port_type);
436 /* Attempts to add 'netdev' as a port on 'dpif'. If 'port_nop' is
437 * non-null and its value is not UINT32_MAX, then attempts to use the
438 * value as the port number.
440 * If successful, returns 0 and sets '*port_nop' to the new port's port
441 * number (if 'port_nop' is non-null). On failure, returns a positive
442 * errno value and sets '*port_nop' to UINT32_MAX (if 'port_nop' is
445 dpif_port_add(struct dpif *dpif, struct netdev *netdev, uint32_t *port_nop)
447 const char *netdev_name = netdev_get_name(netdev);
448 uint32_t port_no = UINT32_MAX;
451 COVERAGE_INC(dpif_port_add);
457 error = dpif->dpif_class->port_add(dpif, netdev, &port_no);
459 VLOG_DBG_RL(&dpmsg_rl, "%s: added %s as port %"PRIu32,
460 dpif_name(dpif), netdev_name, port_no);
462 VLOG_WARN_RL(&error_rl, "%s: failed to add %s as port: %s",
463 dpif_name(dpif), netdev_name, strerror(error));
464 port_no = UINT32_MAX;
472 /* Attempts to remove 'dpif''s port number 'port_no'. Returns 0 if successful,
473 * otherwise a positive errno value. */
475 dpif_port_del(struct dpif *dpif, uint32_t port_no)
479 COVERAGE_INC(dpif_port_del);
481 error = dpif->dpif_class->port_del(dpif, port_no);
483 VLOG_DBG_RL(&dpmsg_rl, "%s: port_del(%"PRIu32")",
484 dpif_name(dpif), port_no);
486 log_operation(dpif, "port_del", error);
491 /* Makes a deep copy of 'src' into 'dst'. */
493 dpif_port_clone(struct dpif_port *dst, const struct dpif_port *src)
495 dst->name = xstrdup(src->name);
496 dst->type = xstrdup(src->type);
497 dst->port_no = src->port_no;
500 /* Frees memory allocated to members of 'dpif_port'.
502 * Do not call this function on a dpif_port obtained from
503 * dpif_port_dump_next(): that function retains ownership of the data in the
506 dpif_port_destroy(struct dpif_port *dpif_port)
508 free(dpif_port->name);
509 free(dpif_port->type);
512 /* Checks if port named 'devname' exists in 'dpif'. If so, returns
513 * true; otherwise, returns false. */
515 dpif_port_exists(const struct dpif *dpif, const char *devname)
517 int error = dpif->dpif_class->port_query_by_name(dpif, devname, NULL);
518 if (error != 0 && error != ENOENT && error != ENODEV) {
519 VLOG_WARN_RL(&error_rl, "%s: failed to query port %s: %s",
520 dpif_name(dpif), devname, strerror(error));
526 /* Looks up port number 'port_no' in 'dpif'. On success, returns 0 and
527 * initializes '*port' appropriately; on failure, returns a positive errno
530 * The caller owns the data in 'port' and must free it with
531 * dpif_port_destroy() when it is no longer needed. */
533 dpif_port_query_by_number(const struct dpif *dpif, uint32_t port_no,
534 struct dpif_port *port)
536 int error = dpif->dpif_class->port_query_by_number(dpif, port_no, port);
538 VLOG_DBG_RL(&dpmsg_rl, "%s: port %"PRIu32" is device %s",
539 dpif_name(dpif), port_no, port->name);
541 memset(port, 0, sizeof *port);
542 VLOG_WARN_RL(&error_rl, "%s: failed to query port %"PRIu32": %s",
543 dpif_name(dpif), port_no, strerror(error));
548 /* Looks up port named 'devname' in 'dpif'. On success, returns 0 and
549 * initializes '*port' appropriately; on failure, returns a positive errno
552 * The caller owns the data in 'port' and must free it with
553 * dpif_port_destroy() when it is no longer needed. */
555 dpif_port_query_by_name(const struct dpif *dpif, const char *devname,
556 struct dpif_port *port)
558 int error = dpif->dpif_class->port_query_by_name(dpif, devname, port);
560 VLOG_DBG_RL(&dpmsg_rl, "%s: device %s is on port %"PRIu32,
561 dpif_name(dpif), devname, port->port_no);
563 memset(port, 0, sizeof *port);
565 /* For ENOENT or ENODEV we use DBG level because the caller is probably
566 * interested in whether 'dpif' actually has a port 'devname', so that
567 * it's not an issue worth logging if it doesn't. Other errors are
568 * uncommon and more likely to indicate a real problem. */
570 error == ENOENT || error == ENODEV ? VLL_DBG : VLL_WARN,
571 "%s: failed to query port %s: %s",
572 dpif_name(dpif), devname, strerror(error));
577 /* Returns one greater than the maximum port number accepted in flow
580 dpif_get_max_ports(const struct dpif *dpif)
582 return dpif->dpif_class->get_max_ports(dpif);
585 /* Returns the Netlink PID value to supply in OVS_ACTION_ATTR_USERSPACE actions
586 * as the OVS_USERSPACE_ATTR_PID attribute's value, for use in flows whose
587 * packets arrived on port 'port_no'.
589 * A 'port_no' of UINT32_MAX is a special case: it returns a reserved PID, not
590 * allocated to any port, that the client may use for special purposes.
592 * The return value is only meaningful when DPIF_UC_ACTION has been enabled in
593 * the 'dpif''s listen mask. It is allowed to change when DPIF_UC_ACTION is
594 * disabled and then re-enabled, so a client that does that must be prepared to
595 * update all of the flows that it installed that contain
596 * OVS_ACTION_ATTR_USERSPACE actions. */
598 dpif_port_get_pid(const struct dpif *dpif, uint32_t port_no)
600 return (dpif->dpif_class->port_get_pid
601 ? (dpif->dpif_class->port_get_pid)(dpif, port_no)
605 /* Looks up port number 'port_no' in 'dpif'. On success, returns 0 and copies
606 * the port's name into the 'name_size' bytes in 'name', ensuring that the
607 * result is null-terminated. On failure, returns a positive errno value and
608 * makes 'name' the empty string. */
610 dpif_port_get_name(struct dpif *dpif, uint32_t port_no,
611 char *name, size_t name_size)
613 struct dpif_port port;
616 ovs_assert(name_size > 0);
618 error = dpif_port_query_by_number(dpif, port_no, &port);
620 ovs_strlcpy(name, port.name, name_size);
621 dpif_port_destroy(&port);
628 /* Initializes 'dump' to begin dumping the ports in a dpif.
630 * This function provides no status indication. An error status for the entire
631 * dump operation is provided when it is completed by calling
632 * dpif_port_dump_done().
635 dpif_port_dump_start(struct dpif_port_dump *dump, const struct dpif *dpif)
638 dump->error = dpif->dpif_class->port_dump_start(dpif, &dump->state);
639 log_operation(dpif, "port_dump_start", dump->error);
642 /* Attempts to retrieve another port from 'dump', which must have been
643 * initialized with dpif_port_dump_start(). On success, stores a new dpif_port
644 * into 'port' and returns true. On failure, returns false.
646 * Failure might indicate an actual error or merely that the last port has been
647 * dumped. An error status for the entire dump operation is provided when it
648 * is completed by calling dpif_port_dump_done().
650 * The dpif owns the data stored in 'port'. It will remain valid until at
651 * least the next time 'dump' is passed to dpif_port_dump_next() or
652 * dpif_port_dump_done(). */
654 dpif_port_dump_next(struct dpif_port_dump *dump, struct dpif_port *port)
656 const struct dpif *dpif = dump->dpif;
662 dump->error = dpif->dpif_class->port_dump_next(dpif, dump->state, port);
663 if (dump->error == EOF) {
664 VLOG_DBG_RL(&dpmsg_rl, "%s: dumped all ports", dpif_name(dpif));
666 log_operation(dpif, "port_dump_next", dump->error);
670 dpif->dpif_class->port_dump_done(dpif, dump->state);
676 /* Completes port table dump operation 'dump', which must have been initialized
677 * with dpif_port_dump_start(). Returns 0 if the dump operation was
678 * error-free, otherwise a positive errno value describing the problem. */
680 dpif_port_dump_done(struct dpif_port_dump *dump)
682 const struct dpif *dpif = dump->dpif;
684 dump->error = dpif->dpif_class->port_dump_done(dpif, dump->state);
685 log_operation(dpif, "port_dump_done", dump->error);
687 return dump->error == EOF ? 0 : dump->error;
690 /* Polls for changes in the set of ports in 'dpif'. If the set of ports in
691 * 'dpif' has changed, this function does one of the following:
693 * - Stores the name of the device that was added to or deleted from 'dpif' in
694 * '*devnamep' and returns 0. The caller is responsible for freeing
695 * '*devnamep' (with free()) when it no longer needs it.
697 * - Returns ENOBUFS and sets '*devnamep' to NULL.
699 * This function may also return 'false positives', where it returns 0 and
700 * '*devnamep' names a device that was not actually added or deleted or it
701 * returns ENOBUFS without any change.
703 * Returns EAGAIN if the set of ports in 'dpif' has not changed. May also
704 * return other positive errno values to indicate that something has gone
707 dpif_port_poll(const struct dpif *dpif, char **devnamep)
709 int error = dpif->dpif_class->port_poll(dpif, devnamep);
716 /* Arranges for the poll loop to wake up when port_poll(dpif) will return a
717 * value other than EAGAIN. */
719 dpif_port_poll_wait(const struct dpif *dpif)
721 dpif->dpif_class->port_poll_wait(dpif);
724 /* Extracts the flow stats for a packet. The 'flow' and 'packet'
725 * arguments must have been initialized through a call to flow_extract().
726 * 'used' is stored into stats->used. */
728 dpif_flow_stats_extract(const struct flow *flow, const struct ofpbuf *packet,
729 long long int used, struct dpif_flow_stats *stats)
731 stats->tcp_flags = packet_get_tcp_flags(packet, flow);
732 stats->n_bytes = packet->size;
733 stats->n_packets = 1;
737 /* Appends a human-readable representation of 'stats' to 's'. */
739 dpif_flow_stats_format(const struct dpif_flow_stats *stats, struct ds *s)
741 ds_put_format(s, "packets:%"PRIu64", bytes:%"PRIu64", used:",
742 stats->n_packets, stats->n_bytes);
744 ds_put_format(s, "%.3fs", (time_msec() - stats->used) / 1000.0);
746 ds_put_format(s, "never");
748 if (stats->tcp_flags) {
749 ds_put_cstr(s, ", flags:");
750 packet_format_tcp_flags(s, stats->tcp_flags);
754 /* Deletes all flows from 'dpif'. Returns 0 if successful, otherwise a
755 * positive errno value. */
757 dpif_flow_flush(struct dpif *dpif)
761 COVERAGE_INC(dpif_flow_flush);
763 error = dpif->dpif_class->flow_flush(dpif);
764 log_operation(dpif, "flow_flush", error);
768 /* Queries 'dpif' for a flow entry. The flow is specified by the Netlink
769 * attributes with types OVS_KEY_ATTR_* in the 'key_len' bytes starting at
772 * Returns 0 if successful. If no flow matches, returns ENOENT. On other
773 * failure, returns a positive errno value.
775 * If 'actionsp' is nonnull, then on success '*actionsp' will be set to an
776 * ofpbuf owned by the caller that contains the Netlink attributes for the
777 * flow's actions. The caller must free the ofpbuf (with ofpbuf_delete()) when
778 * it is no longer needed.
780 * If 'stats' is nonnull, then on success it will be updated with the flow's
783 dpif_flow_get(const struct dpif *dpif,
784 const struct nlattr *key, size_t key_len,
785 struct ofpbuf **actionsp, struct dpif_flow_stats *stats)
789 COVERAGE_INC(dpif_flow_get);
791 error = dpif->dpif_class->flow_get(dpif, key, key_len, actionsp, stats);
797 memset(stats, 0, sizeof *stats);
800 if (should_log_flow_message(error)) {
801 const struct nlattr *actions;
804 if (!error && actionsp) {
805 actions = (*actionsp)->data;
806 actions_len = (*actionsp)->size;
811 log_flow_message(dpif, error, "flow_get", key, key_len, stats,
812 actions, actions_len);
818 dpif_flow_put__(struct dpif *dpif, const struct dpif_flow_put *put)
822 COVERAGE_INC(dpif_flow_put);
823 ovs_assert(!(put->flags & ~(DPIF_FP_CREATE | DPIF_FP_MODIFY
824 | DPIF_FP_ZERO_STATS)));
826 error = dpif->dpif_class->flow_put(dpif, put);
827 if (error && put->stats) {
828 memset(put->stats, 0, sizeof *put->stats);
830 log_flow_put_message(dpif, put, error);
834 /* Adds or modifies a flow in 'dpif'. The flow is specified by the Netlink
835 * attributes with types OVS_KEY_ATTR_* in the 'key_len' bytes starting at
836 * 'key'. The associated actions are specified by the Netlink attributes with
837 * types OVS_ACTION_ATTR_* in the 'actions_len' bytes starting at 'actions'.
839 * - If the flow's key does not exist in 'dpif', then the flow will be added if
840 * 'flags' includes DPIF_FP_CREATE. Otherwise the operation will fail with
843 * If the operation succeeds, then 'stats', if nonnull, will be zeroed.
845 * - If the flow's key does exist in 'dpif', then the flow's actions will be
846 * updated if 'flags' includes DPIF_FP_MODIFY. Otherwise the operation will
847 * fail with EEXIST. If the flow's actions are updated, then its statistics
848 * will be zeroed if 'flags' includes DPIF_FP_ZERO_STATS, and left as-is
851 * If the operation succeeds, then 'stats', if nonnull, will be set to the
852 * flow's statistics before the update.
855 dpif_flow_put(struct dpif *dpif, enum dpif_flow_put_flags flags,
856 const struct nlattr *key, size_t key_len,
857 const struct nlattr *actions, size_t actions_len,
858 struct dpif_flow_stats *stats)
860 struct dpif_flow_put put;
864 put.key_len = key_len;
865 put.actions = actions;
866 put.actions_len = actions_len;
868 return dpif_flow_put__(dpif, &put);
872 dpif_flow_del__(struct dpif *dpif, struct dpif_flow_del *del)
876 COVERAGE_INC(dpif_flow_del);
878 error = dpif->dpif_class->flow_del(dpif, del);
879 if (error && del->stats) {
880 memset(del->stats, 0, sizeof *del->stats);
882 log_flow_del_message(dpif, del, error);
886 /* Deletes a flow from 'dpif' and returns 0, or returns ENOENT if 'dpif' does
887 * not contain such a flow. The flow is specified by the Netlink attributes
888 * with types OVS_KEY_ATTR_* in the 'key_len' bytes starting at 'key'.
890 * If the operation succeeds, then 'stats', if nonnull, will be set to the
891 * flow's statistics before its deletion. */
893 dpif_flow_del(struct dpif *dpif,
894 const struct nlattr *key, size_t key_len,
895 struct dpif_flow_stats *stats)
897 struct dpif_flow_del del;
900 del.key_len = key_len;
902 return dpif_flow_del__(dpif, &del);
905 /* Initializes 'dump' to begin dumping the flows in a dpif.
907 * This function provides no status indication. An error status for the entire
908 * dump operation is provided when it is completed by calling
909 * dpif_flow_dump_done().
912 dpif_flow_dump_start(struct dpif_flow_dump *dump, const struct dpif *dpif)
915 dump->error = dpif->dpif_class->flow_dump_start(dpif, &dump->state);
916 log_operation(dpif, "flow_dump_start", dump->error);
919 /* Attempts to retrieve another flow from 'dump', which must have been
920 * initialized with dpif_flow_dump_start(). On success, updates the output
921 * parameters as described below and returns true. Otherwise, returns false.
922 * Failure might indicate an actual error or merely the end of the flow table.
923 * An error status for the entire dump operation is provided when it is
924 * completed by calling dpif_flow_dump_done().
926 * On success, if 'key' and 'key_len' are nonnull then '*key' and '*key_len'
927 * will be set to Netlink attributes with types OVS_KEY_ATTR_* representing the
928 * dumped flow's key. If 'actions' and 'actions_len' are nonnull then they are
929 * set to Netlink attributes with types OVS_ACTION_ATTR_* representing the
930 * dumped flow's actions. If 'stats' is nonnull then it will be set to the
931 * dumped flow's statistics.
933 * All of the returned data is owned by 'dpif', not by the caller, and the
934 * caller must not modify or free it. 'dpif' guarantees that it remains
935 * accessible and unchanging until at least the next call to 'flow_dump_next'
936 * or 'flow_dump_done' for 'dump'. */
938 dpif_flow_dump_next(struct dpif_flow_dump *dump,
939 const struct nlattr **key, size_t *key_len,
940 const struct nlattr **actions, size_t *actions_len,
941 const struct dpif_flow_stats **stats)
943 const struct dpif *dpif = dump->dpif;
944 int error = dump->error;
947 error = dpif->dpif_class->flow_dump_next(dpif, dump->state,
949 actions, actions_len,
952 dpif->dpif_class->flow_dump_done(dpif, dump->state);
970 VLOG_DBG_RL(&dpmsg_rl, "%s: dumped all flows", dpif_name(dpif));
971 } else if (should_log_flow_message(error)) {
972 log_flow_message(dpif, error, "flow_dump",
973 key ? *key : NULL, key ? *key_len : 0,
974 stats ? *stats : NULL, actions ? *actions : NULL,
975 actions ? *actions_len : 0);
982 /* Completes flow table dump operation 'dump', which must have been initialized
983 * with dpif_flow_dump_start(). Returns 0 if the dump operation was
984 * error-free, otherwise a positive errno value describing the problem. */
986 dpif_flow_dump_done(struct dpif_flow_dump *dump)
988 const struct dpif *dpif = dump->dpif;
990 dump->error = dpif->dpif_class->flow_dump_done(dpif, dump->state);
991 log_operation(dpif, "flow_dump_done", dump->error);
993 return dump->error == EOF ? 0 : dump->error;
997 dpif_execute__(struct dpif *dpif, const struct dpif_execute *execute)
1001 COVERAGE_INC(dpif_execute);
1002 if (execute->actions_len > 0) {
1003 error = dpif->dpif_class->execute(dpif, execute);
1008 log_execute_message(dpif, execute, error);
1013 /* Causes 'dpif' to perform the 'actions_len' bytes of actions in 'actions' on
1014 * the Ethernet frame specified in 'packet' taken from the flow specified in
1015 * the 'key_len' bytes of 'key'. ('key' is mostly redundant with 'packet', but
1016 * it contains some metadata that cannot be recovered from 'packet', such as
1017 * tunnel and in_port.)
1019 * Returns 0 if successful, otherwise a positive errno value. */
1021 dpif_execute(struct dpif *dpif,
1022 const struct nlattr *key, size_t key_len,
1023 const struct nlattr *actions, size_t actions_len,
1024 const struct ofpbuf *buf)
1026 struct dpif_execute execute;
1029 execute.key_len = key_len;
1030 execute.actions = actions;
1031 execute.actions_len = actions_len;
1032 execute.packet = buf;
1033 return dpif_execute__(dpif, &execute);
1036 /* Executes each of the 'n_ops' operations in 'ops' on 'dpif', in the order in
1037 * which they are specified, placing each operation's results in the "output"
1038 * members documented in comments.
1040 * This function exists because some datapaths can perform batched operations
1041 * faster than individual operations. */
1043 dpif_operate(struct dpif *dpif, struct dpif_op **ops, size_t n_ops)
1047 if (dpif->dpif_class->operate) {
1048 dpif->dpif_class->operate(dpif, ops, n_ops);
1050 for (i = 0; i < n_ops; i++) {
1051 struct dpif_op *op = ops[i];
1054 case DPIF_OP_FLOW_PUT:
1055 log_flow_put_message(dpif, &op->u.flow_put, op->error);
1058 case DPIF_OP_FLOW_DEL:
1059 log_flow_del_message(dpif, &op->u.flow_del, op->error);
1062 case DPIF_OP_EXECUTE:
1063 log_execute_message(dpif, &op->u.execute, op->error);
1070 for (i = 0; i < n_ops; i++) {
1071 struct dpif_op *op = ops[i];
1074 case DPIF_OP_FLOW_PUT:
1075 op->error = dpif_flow_put__(dpif, &op->u.flow_put);
1078 case DPIF_OP_FLOW_DEL:
1079 op->error = dpif_flow_del__(dpif, &op->u.flow_del);
1082 case DPIF_OP_EXECUTE:
1083 op->error = dpif_execute__(dpif, &op->u.execute);
1093 /* Returns a string that represents 'type', for use in log messages. */
1095 dpif_upcall_type_to_string(enum dpif_upcall_type type)
1098 case DPIF_UC_MISS: return "miss";
1099 case DPIF_UC_ACTION: return "action";
1100 case DPIF_N_UC_TYPES: default: return "<unknown>";
1104 /* Enables or disables receiving packets with dpif_recv() on 'dpif'. Returns 0
1105 * if successful, otherwise a positive errno value.
1107 * Turning packet receive off and then back on may change the Netlink PID
1108 * assignments returned by dpif_port_get_pid(). If the client does this, it
1109 * must update all of the flows that have OVS_ACTION_ATTR_USERSPACE actions
1110 * using the new PID assignment. */
1112 dpif_recv_set(struct dpif *dpif, bool enable)
1114 int error = dpif->dpif_class->recv_set(dpif, enable);
1115 log_operation(dpif, "recv_set", error);
1119 /* Polls for an upcall from 'dpif'. If successful, stores the upcall into
1120 * '*upcall', using 'buf' for storage. Should only be called if
1121 * dpif_recv_set() has been used to enable receiving packets on 'dpif'.
1123 * 'upcall->packet' and 'upcall->key' point into data in the caller-provided
1124 * 'buf', so their memory cannot be freed separately from 'buf'. (This is
1125 * hardly a great way to do things but it works out OK for the dpif providers
1126 * and clients that exist so far.)
1128 * Returns 0 if successful, otherwise a positive errno value. Returns EAGAIN
1129 * if no upcall is immediately available. */
1131 dpif_recv(struct dpif *dpif, struct dpif_upcall *upcall, struct ofpbuf *buf)
1133 int error = dpif->dpif_class->recv(dpif, upcall, buf);
1134 if (!error && !VLOG_DROP_DBG(&dpmsg_rl)) {
1138 packet = ofp_packet_to_string(upcall->packet->data,
1139 upcall->packet->size);
1142 odp_flow_key_format(upcall->key, upcall->key_len, &flow);
1144 VLOG_DBG("%s: %s upcall:\n%s\n%s",
1145 dpif_name(dpif), dpif_upcall_type_to_string(upcall->type),
1146 ds_cstr(&flow), packet);
1150 } else if (error && error != EAGAIN) {
1151 log_operation(dpif, "recv", error);
1156 /* Discards all messages that would otherwise be received by dpif_recv() on
1159 dpif_recv_purge(struct dpif *dpif)
1161 COVERAGE_INC(dpif_purge);
1162 if (dpif->dpif_class->recv_purge) {
1163 dpif->dpif_class->recv_purge(dpif);
1167 /* Arranges for the poll loop to wake up when 'dpif' has a message queued to be
1168 * received with dpif_recv(). */
1170 dpif_recv_wait(struct dpif *dpif)
1172 dpif->dpif_class->recv_wait(dpif);
1175 /* Obtains the NetFlow engine type and engine ID for 'dpif' into '*engine_type'
1176 * and '*engine_id', respectively. */
1178 dpif_get_netflow_ids(const struct dpif *dpif,
1179 uint8_t *engine_type, uint8_t *engine_id)
1181 *engine_type = dpif->netflow_engine_type;
1182 *engine_id = dpif->netflow_engine_id;
1185 /* Translates OpenFlow queue ID 'queue_id' (in host byte order) into a priority
1186 * value used for setting packet priority.
1187 * On success, returns 0 and stores the priority into '*priority'.
1188 * On failure, returns a positive errno value and stores 0 into '*priority'. */
1190 dpif_queue_to_priority(const struct dpif *dpif, uint32_t queue_id,
1193 int error = (dpif->dpif_class->queue_to_priority
1194 ? dpif->dpif_class->queue_to_priority(dpif, queue_id,
1200 log_operation(dpif, "queue_to_priority", error);
1205 dpif_init(struct dpif *dpif, const struct dpif_class *dpif_class,
1207 uint8_t netflow_engine_type, uint8_t netflow_engine_id)
1209 dpif->dpif_class = dpif_class;
1210 dpif->base_name = xstrdup(name);
1211 dpif->full_name = xasprintf("%s@%s", dpif_class->type, name);
1212 dpif->netflow_engine_type = netflow_engine_type;
1213 dpif->netflow_engine_id = netflow_engine_id;
1216 /* Undoes the results of initialization.
1218 * Normally this function only needs to be called from dpif_close().
1219 * However, it may be called by providers due to an error on opening
1220 * that occurs after initialization. It this case dpif_close() would
1221 * never be called. */
1223 dpif_uninit(struct dpif *dpif, bool close)
1225 char *base_name = dpif->base_name;
1226 char *full_name = dpif->full_name;
1229 dpif->dpif_class->close(dpif);
1237 log_operation(const struct dpif *dpif, const char *operation, int error)
1240 VLOG_DBG_RL(&dpmsg_rl, "%s: %s success", dpif_name(dpif), operation);
1241 } else if (ofperr_is_valid(error)) {
1242 VLOG_WARN_RL(&error_rl, "%s: %s failed (%s)",
1243 dpif_name(dpif), operation, ofperr_get_name(error));
1245 VLOG_WARN_RL(&error_rl, "%s: %s failed (%s)",
1246 dpif_name(dpif), operation, strerror(error));
1250 static enum vlog_level
1251 flow_message_log_level(int error)
1253 return error ? VLL_WARN : VLL_DBG;
1257 should_log_flow_message(int error)
1259 return !vlog_should_drop(THIS_MODULE, flow_message_log_level(error),
1260 error ? &error_rl : &dpmsg_rl);
1264 log_flow_message(const struct dpif *dpif, int error, const char *operation,
1265 const struct nlattr *key, size_t key_len,
1266 const struct dpif_flow_stats *stats,
1267 const struct nlattr *actions, size_t actions_len)
1269 struct ds ds = DS_EMPTY_INITIALIZER;
1270 ds_put_format(&ds, "%s: ", dpif_name(dpif));
1272 ds_put_cstr(&ds, "failed to ");
1274 ds_put_format(&ds, "%s ", operation);
1276 ds_put_format(&ds, "(%s) ", strerror(error));
1278 odp_flow_key_format(key, key_len, &ds);
1280 ds_put_cstr(&ds, ", ");
1281 dpif_flow_stats_format(stats, &ds);
1283 if (actions || actions_len) {
1284 ds_put_cstr(&ds, ", actions:");
1285 format_odp_actions(&ds, actions, actions_len);
1287 vlog(THIS_MODULE, flow_message_log_level(error), "%s", ds_cstr(&ds));
1292 log_flow_put_message(struct dpif *dpif, const struct dpif_flow_put *put,
1295 if (should_log_flow_message(error)) {
1299 ds_put_cstr(&s, "put");
1300 if (put->flags & DPIF_FP_CREATE) {
1301 ds_put_cstr(&s, "[create]");
1303 if (put->flags & DPIF_FP_MODIFY) {
1304 ds_put_cstr(&s, "[modify]");
1306 if (put->flags & DPIF_FP_ZERO_STATS) {
1307 ds_put_cstr(&s, "[zero]");
1309 log_flow_message(dpif, error, ds_cstr(&s),
1310 put->key, put->key_len, put->stats,
1311 put->actions, put->actions_len);
1317 log_flow_del_message(struct dpif *dpif, const struct dpif_flow_del *del,
1320 if (should_log_flow_message(error)) {
1321 log_flow_message(dpif, error, "flow_del", del->key, del->key_len,
1322 !error ? del->stats : NULL, NULL, 0);
1327 log_execute_message(struct dpif *dpif, const struct dpif_execute *execute,
1330 if (!(error ? VLOG_DROP_WARN(&error_rl) : VLOG_DROP_DBG(&dpmsg_rl))) {
1331 struct ds ds = DS_EMPTY_INITIALIZER;
1334 packet = ofp_packet_to_string(execute->packet->data,
1335 execute->packet->size);
1336 ds_put_format(&ds, "%s: execute ", dpif_name(dpif));
1337 format_odp_actions(&ds, execute->actions, execute->actions_len);
1339 ds_put_format(&ds, " failed (%s)", strerror(error));
1341 ds_put_format(&ds, " on packet %s", packet);
1342 vlog(THIS_MODULE, error ? VLL_WARN : VLL_DBG, "%s", ds_cstr(&ds));