1 /* Copyright (c) 2009, 2010, 2011, 2012, 2013, 2014 Nicira, Inc.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License. */
16 #include "ofproto-dpif-upcall.h"
25 #include "dynamic-string.h"
26 #include "fail-open.h"
27 #include "guarded-list.h"
32 #include "ofproto-dpif-ipfix.h"
33 #include "ofproto-dpif-sflow.h"
34 #include "ofproto-dpif-xlate.h"
36 #include "poll-loop.h"
41 #define MAX_QUEUE_LENGTH 512
42 #define FLOW_MISS_MAX_BATCH 50
43 #define REVALIDATE_MAX_BATCH 50
45 VLOG_DEFINE_THIS_MODULE(ofproto_dpif_upcall);
47 COVERAGE_DEFINE(upcall_queue_overflow);
49 /* A thread that processes each upcall handed to it by the dispatcher thread,
50 * forwards the upcall's packet, and possibly sets up a kernel flow as a
53 struct udpif *udpif; /* Parent udpif. */
54 pthread_t thread; /* Thread ID. */
55 char *name; /* Thread name. */
57 struct ovs_mutex mutex; /* Mutex guarding the following. */
59 /* Atomic queue of unprocessed upcalls. */
60 struct list upcalls OVS_GUARDED;
61 size_t n_upcalls OVS_GUARDED;
63 bool need_signal; /* Only changed by the dispatcher. */
65 pthread_cond_t wake_cond; /* Wakes 'thread' while holding
69 /* A thread that processes each kernel flow handed to it by the flow_dumper
70 * thread, updates OpenFlow statistics, and updates or removes the kernel flow
73 struct udpif *udpif; /* Parent udpif. */
74 char *name; /* Thread name. */
76 pthread_t thread; /* Thread ID. */
77 struct hmap ukeys; /* Datapath flow keys. */
81 struct ovs_mutex mutex; /* Mutex guarding the following. */
82 pthread_cond_t wake_cond;
83 struct list udumps OVS_GUARDED; /* Unprocessed udumps. */
84 size_t n_udumps OVS_GUARDED; /* Number of unprocessed udumps. */
87 /* An upcall handler for ofproto_dpif.
89 * udpif has two logically separate pieces:
91 * - A "dispatcher" thread that reads upcalls from the kernel and dispatches
92 * them to one of several "handler" threads (see struct handler).
94 * - A "flow_dumper" thread that reads the kernel flow table and dispatches
95 * flows to one of several "revalidator" threads (see struct
98 struct list list_node; /* In all_udpifs list. */
100 struct dpif *dpif; /* Datapath handle. */
101 struct dpif_backer *backer; /* Opaque dpif_backer pointer. */
103 uint32_t secret; /* Random seed for upcall hash. */
105 pthread_t dispatcher; /* Dispatcher thread ID. */
106 pthread_t flow_dumper; /* Flow dumper thread ID. */
108 struct handler *handlers; /* Upcall handlers. */
111 struct revalidator *revalidators; /* Flow revalidators. */
112 size_t n_revalidators;
114 uint64_t last_reval_seq; /* 'reval_seq' at last revalidation. */
115 struct seq *reval_seq; /* Incremented to force revalidation. */
117 struct seq *dump_seq; /* Increments each dump iteration. */
119 struct latch exit_latch; /* Tells child threads to exit. */
121 long long int dump_duration; /* Duration of the last flow dump. */
123 /* Datapath flow statistics. */
124 unsigned int max_n_flows;
125 unsigned int avg_n_flows;
127 /* Following fields are accessed and modified by different threads. */
128 atomic_llong max_idle; /* Maximum datapath flow idle time. */
129 atomic_uint flow_limit; /* Datapath flow hard limit. */
133 BAD_UPCALL, /* Some kind of bug somewhere. */
134 MISS_UPCALL, /* A flow miss. */
135 SFLOW_UPCALL, /* sFlow sample. */
136 FLOW_SAMPLE_UPCALL, /* Per-flow sampling. */
137 IPFIX_UPCALL /* Per-bridge sampling. */
141 struct list list_node; /* For queuing upcalls. */
142 struct flow_miss *flow_miss; /* This upcall's flow_miss. */
144 /* Raw upcall plus data for keeping track of the memory backing it. */
145 struct dpif_upcall dpif_upcall; /* As returned by dpif_recv() */
146 struct ofpbuf upcall_buf; /* Owns some data in 'dpif_upcall'. */
147 uint64_t upcall_stub[512 / 8]; /* Buffer to reduce need for malloc(). */
150 /* 'udpif_key's are responsible for tracking the little bit of state udpif
151 * needs to do flow expiration which can't be pulled directly from the
152 * datapath. They are owned, created by, maintained, and destroyed by a single
153 * revalidator making them easy to efficiently handle with multiple threads. */
155 struct hmap_node hmap_node; /* In parent revalidator 'ukeys' map. */
157 struct nlattr *key; /* Datapath flow key. */
158 size_t key_len; /* Length of 'key'. */
160 struct dpif_flow_stats stats; /* Stats at most recent flow dump. */
161 long long int created; /* Estimation of creation time. */
163 bool mark; /* Used by mark and sweep GC algorithm. */
165 struct odputil_keybuf key_buf; /* Memory for 'key'. */
168 /* 'udpif_flow_dump's hold the state associated with one iteration in a flow
169 * dump operation. This is created by the flow_dumper thread and handed to the
170 * appropriate revalidator thread to be processed. */
171 struct udpif_flow_dump {
172 struct list list_node;
174 struct nlattr *key; /* Datapath flow key. */
175 size_t key_len; /* Length of 'key'. */
176 uint32_t key_hash; /* Hash of 'key'. */
178 struct odputil_keybuf mask_buf;
179 struct nlattr *mask; /* Datapath mask for 'key'. */
180 size_t mask_len; /* Length of 'mask'. */
182 struct dpif_flow_stats stats; /* Stats pulled from the datapath. */
184 bool need_revalidate; /* Key needs revalidation? */
186 struct odputil_keybuf key_buf;
189 /* Flow miss batching.
191 * Some dpifs implement operations faster when you hand them off in a batch.
192 * To allow batching, "struct flow_miss" queues the dpif-related work needed
193 * for a given flow. Each "struct flow_miss" corresponds to sending one or
194 * more packets, plus possibly installing the flow in the dpif. */
196 struct hmap_node hmap_node;
197 struct ofproto_dpif *ofproto;
200 enum odp_key_fitness key_fitness;
201 const struct nlattr *key;
203 enum dpif_upcall_type upcall_type;
204 struct dpif_flow_stats stats;
205 odp_port_t odp_in_port;
207 uint64_t slow_path_buf[128 / 8];
208 struct odputil_keybuf mask_buf;
210 struct xlate_out xout;
215 static void upcall_destroy(struct upcall *);
217 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
218 static struct list all_udpifs = LIST_INITIALIZER(&all_udpifs);
220 static void recv_upcalls(struct udpif *);
221 static void handle_upcalls(struct handler *handler, struct list *upcalls);
222 static void *udpif_flow_dumper(void *);
223 static void *udpif_dispatcher(void *);
224 static void *udpif_upcall_handler(void *);
225 static void *udpif_revalidator(void *);
226 static uint64_t udpif_get_n_flows(const struct udpif *);
227 static void revalidate_udumps(struct revalidator *, struct list *udumps);
228 static void revalidator_sweep(struct revalidator *);
229 static void upcall_unixctl_show(struct unixctl_conn *conn, int argc,
230 const char *argv[], void *aux);
231 static void upcall_unixctl_disable_megaflows(struct unixctl_conn *, int argc,
232 const char *argv[], void *aux);
233 static void upcall_unixctl_enable_megaflows(struct unixctl_conn *, int argc,
234 const char *argv[], void *aux);
235 static void ukey_delete(struct revalidator *, struct udpif_key *);
237 static atomic_bool enable_megaflows = ATOMIC_VAR_INIT(true);
240 udpif_create(struct dpif_backer *backer, struct dpif *dpif)
242 static struct ovsthread_once once = OVSTHREAD_ONCE_INITIALIZER;
243 struct udpif *udpif = xzalloc(sizeof *udpif);
245 if (ovsthread_once_start(&once)) {
246 unixctl_command_register("upcall/show", "", 0, 0, upcall_unixctl_show,
248 unixctl_command_register("upcall/disable-megaflows", "", 0, 0,
249 upcall_unixctl_disable_megaflows, NULL);
250 unixctl_command_register("upcall/enable-megaflows", "", 0, 0,
251 upcall_unixctl_enable_megaflows, NULL);
252 ovsthread_once_done(&once);
256 udpif->backer = backer;
257 atomic_init(&udpif->max_idle, 5000);
258 atomic_init(&udpif->flow_limit, MIN(ofproto_flow_limit, 10000));
259 udpif->secret = random_uint32();
260 udpif->reval_seq = seq_create();
261 udpif->dump_seq = seq_create();
262 latch_init(&udpif->exit_latch);
263 list_push_back(&all_udpifs, &udpif->list_node);
269 udpif_destroy(struct udpif *udpif)
271 udpif_set_threads(udpif, 0, 0);
274 list_remove(&udpif->list_node);
275 latch_destroy(&udpif->exit_latch);
276 seq_destroy(udpif->reval_seq);
277 seq_destroy(udpif->dump_seq);
281 /* Tells 'udpif' how many threads it should use to handle upcalls. Disables
282 * all threads if 'n_handlers' and 'n_revalidators' is zero. 'udpif''s
283 * datapath handle must have packet reception enabled before starting threads.
286 udpif_set_threads(struct udpif *udpif, size_t n_handlers,
287 size_t n_revalidators)
289 /* Stop the old threads (if any). */
290 if (udpif->handlers &&
291 (udpif->n_handlers != n_handlers
292 || udpif->n_revalidators != n_revalidators)) {
295 latch_set(&udpif->exit_latch);
297 for (i = 0; i < udpif->n_handlers; i++) {
298 struct handler *handler = &udpif->handlers[i];
300 ovs_mutex_lock(&handler->mutex);
301 xpthread_cond_signal(&handler->wake_cond);
302 ovs_mutex_unlock(&handler->mutex);
303 xpthread_join(handler->thread, NULL);
306 for (i = 0; i < udpif->n_revalidators; i++) {
307 struct revalidator *revalidator = &udpif->revalidators[i];
309 ovs_mutex_lock(&revalidator->mutex);
310 xpthread_cond_signal(&revalidator->wake_cond);
311 ovs_mutex_unlock(&revalidator->mutex);
312 xpthread_join(revalidator->thread, NULL);
315 xpthread_join(udpif->flow_dumper, NULL);
316 xpthread_join(udpif->dispatcher, NULL);
318 for (i = 0; i < udpif->n_revalidators; i++) {
319 struct revalidator *revalidator = &udpif->revalidators[i];
320 struct udpif_flow_dump *udump, *next_udump;
321 struct udpif_key *ukey, *next_ukey;
323 LIST_FOR_EACH_SAFE (udump, next_udump, list_node,
324 &revalidator->udumps) {
325 list_remove(&udump->list_node);
329 HMAP_FOR_EACH_SAFE (ukey, next_ukey, hmap_node,
330 &revalidator->ukeys) {
331 ukey_delete(revalidator, ukey);
333 hmap_destroy(&revalidator->ukeys);
334 ovs_mutex_destroy(&revalidator->mutex);
336 free(revalidator->name);
339 for (i = 0; i < udpif->n_handlers; i++) {
340 struct handler *handler = &udpif->handlers[i];
341 struct upcall *miss, *next;
343 LIST_FOR_EACH_SAFE (miss, next, list_node, &handler->upcalls) {
344 list_remove(&miss->list_node);
345 upcall_destroy(miss);
347 ovs_mutex_destroy(&handler->mutex);
349 xpthread_cond_destroy(&handler->wake_cond);
352 latch_poll(&udpif->exit_latch);
354 free(udpif->revalidators);
355 udpif->revalidators = NULL;
356 udpif->n_revalidators = 0;
358 free(udpif->handlers);
359 udpif->handlers = NULL;
360 udpif->n_handlers = 0;
363 /* Start new threads (if necessary). */
364 if (!udpif->handlers && n_handlers) {
367 udpif->n_handlers = n_handlers;
368 udpif->n_revalidators = n_revalidators;
370 udpif->handlers = xzalloc(udpif->n_handlers * sizeof *udpif->handlers);
371 for (i = 0; i < udpif->n_handlers; i++) {
372 struct handler *handler = &udpif->handlers[i];
374 handler->udpif = udpif;
375 list_init(&handler->upcalls);
376 handler->need_signal = false;
377 xpthread_cond_init(&handler->wake_cond, NULL);
378 ovs_mutex_init(&handler->mutex);
379 xpthread_create(&handler->thread, NULL, udpif_upcall_handler,
383 udpif->revalidators = xzalloc(udpif->n_revalidators
384 * sizeof *udpif->revalidators);
385 for (i = 0; i < udpif->n_revalidators; i++) {
386 struct revalidator *revalidator = &udpif->revalidators[i];
388 revalidator->udpif = udpif;
389 list_init(&revalidator->udumps);
390 hmap_init(&revalidator->ukeys);
391 ovs_mutex_init(&revalidator->mutex);
392 xpthread_cond_init(&revalidator->wake_cond, NULL);
393 xpthread_create(&revalidator->thread, NULL, udpif_revalidator,
396 xpthread_create(&udpif->dispatcher, NULL, udpif_dispatcher, udpif);
397 xpthread_create(&udpif->flow_dumper, NULL, udpif_flow_dumper, udpif);
401 /* Notifies 'udpif' that something changed which may render previous
402 * xlate_actions() results invalid. */
404 udpif_revalidate(struct udpif *udpif)
406 seq_change(udpif->reval_seq);
409 /* Returns a seq which increments every time 'udpif' pulls stats from the
410 * datapath. Callers can use this to get a sense of when might be a good time
411 * to do periodic work which relies on relatively up to date statistics. */
413 udpif_dump_seq(struct udpif *udpif)
415 return udpif->dump_seq;
419 udpif_get_memory_usage(struct udpif *udpif, struct simap *usage)
423 simap_increase(usage, "dispatchers", 1);
424 simap_increase(usage, "flow_dumpers", 1);
426 simap_increase(usage, "handlers", udpif->n_handlers);
427 for (i = 0; i < udpif->n_handlers; i++) {
428 struct handler *handler = &udpif->handlers[i];
429 ovs_mutex_lock(&handler->mutex);
430 simap_increase(usage, "handler upcalls", handler->n_upcalls);
431 ovs_mutex_unlock(&handler->mutex);
434 simap_increase(usage, "revalidators", udpif->n_revalidators);
435 for (i = 0; i < udpif->n_revalidators; i++) {
436 struct revalidator *revalidator = &udpif->revalidators[i];
437 ovs_mutex_lock(&revalidator->mutex);
438 simap_increase(usage, "revalidator dumps", revalidator->n_udumps);
440 /* XXX: This isn't technically thread safe because the revalidator
441 * ukeys maps isn't protected by a mutex since it's per thread. */
442 simap_increase(usage, "revalidator keys",
443 hmap_count(&revalidator->ukeys));
444 ovs_mutex_unlock(&revalidator->mutex);
448 /* Removes all flows from all datapaths. */
454 LIST_FOR_EACH (udpif, list_node, &all_udpifs) {
455 dpif_flow_flush(udpif->dpif);
459 /* Destroys and deallocates 'upcall'. */
461 upcall_destroy(struct upcall *upcall)
464 ofpbuf_uninit(&upcall->dpif_upcall.packet);
465 ofpbuf_uninit(&upcall->upcall_buf);
471 udpif_get_n_flows(const struct udpif *udpif)
473 struct dpif_dp_stats stats;
475 dpif_get_dp_stats(udpif->dpif, &stats);
476 return stats.n_flows;
479 /* The dispatcher thread is responsible for receiving upcalls from the kernel,
480 * assigning them to a upcall_handler thread. */
482 udpif_dispatcher(void *arg)
484 struct udpif *udpif = arg;
486 set_subprogram_name("dispatcher");
487 while (!latch_is_set(&udpif->exit_latch)) {
489 dpif_recv_wait(udpif->dpif);
490 latch_wait(&udpif->exit_latch);
498 udpif_flow_dumper(void *arg)
500 struct udpif *udpif = arg;
502 set_subprogram_name("flow_dumper");
503 while (!latch_is_set(&udpif->exit_latch)) {
504 const struct dpif_flow_stats *stats;
505 long long int start_time, duration;
506 const struct nlattr *key, *mask;
507 struct dpif_flow_dump dump;
508 size_t key_len, mask_len;
509 unsigned int flow_limit;
510 long long int max_idle;
511 bool need_revalidate;
515 reval_seq = seq_read(udpif->reval_seq);
516 need_revalidate = udpif->last_reval_seq != reval_seq;
517 udpif->last_reval_seq = reval_seq;
519 n_flows = udpif_get_n_flows(udpif);
520 udpif->max_n_flows = MAX(n_flows, udpif->max_n_flows);
521 udpif->avg_n_flows = (udpif->avg_n_flows + n_flows) / 2;
523 atomic_read(&udpif->flow_limit, &flow_limit);
524 if (n_flows < flow_limit / 8) {
526 } else if (n_flows < flow_limit / 4) {
528 } else if (n_flows < flow_limit / 2) {
533 atomic_store(&udpif->max_idle, max_idle);
535 start_time = time_msec();
536 dpif_flow_dump_start(&dump, udpif->dpif);
537 while (dpif_flow_dump_next(&dump, &key, &key_len, &mask, &mask_len,
539 && !latch_is_set(&udpif->exit_latch)) {
540 struct udpif_flow_dump *udump = xmalloc(sizeof *udump);
541 struct revalidator *revalidator;
543 udump->key_hash = hash_bytes(key, key_len, udpif->secret);
544 memcpy(&udump->key_buf, key, key_len);
545 udump->key = (struct nlattr *) &udump->key_buf;
546 udump->key_len = key_len;
548 memcpy(&udump->mask_buf, mask, mask_len);
549 udump->mask = (struct nlattr *) &udump->mask_buf;
550 udump->mask_len = mask_len;
552 udump->stats = *stats;
553 udump->need_revalidate = need_revalidate;
555 revalidator = &udpif->revalidators[udump->key_hash
556 % udpif->n_revalidators];
558 ovs_mutex_lock(&revalidator->mutex);
559 while (revalidator->n_udumps >= REVALIDATE_MAX_BATCH * 3
560 && !latch_is_set(&udpif->exit_latch)) {
561 ovs_mutex_cond_wait(&revalidator->wake_cond,
562 &revalidator->mutex);
564 list_push_back(&revalidator->udumps, &udump->list_node);
565 revalidator->n_udumps++;
566 xpthread_cond_signal(&revalidator->wake_cond);
567 ovs_mutex_unlock(&revalidator->mutex);
569 dpif_flow_dump_done(&dump);
571 /* Let all the revalidators finish and garbage collect. */
572 seq_change(udpif->dump_seq);
573 for (i = 0; i < udpif->n_revalidators; i++) {
574 struct revalidator *revalidator = &udpif->revalidators[i];
575 ovs_mutex_lock(&revalidator->mutex);
576 xpthread_cond_signal(&revalidator->wake_cond);
577 ovs_mutex_unlock(&revalidator->mutex);
580 for (i = 0; i < udpif->n_revalidators; i++) {
581 struct revalidator *revalidator = &udpif->revalidators[i];
583 ovs_mutex_lock(&revalidator->mutex);
584 while (revalidator->dump_seq != seq_read(udpif->dump_seq)
585 && !latch_is_set(&udpif->exit_latch)) {
586 ovs_mutex_cond_wait(&revalidator->wake_cond,
587 &revalidator->mutex);
589 ovs_mutex_unlock(&revalidator->mutex);
592 duration = time_msec() - start_time;
593 udpif->dump_duration = duration;
594 if (duration > 2000) {
595 flow_limit /= duration / 1000;
596 } else if (duration > 1300) {
597 flow_limit = flow_limit * 3 / 4;
598 } else if (duration < 1000 && n_flows > 2000
599 && flow_limit < n_flows * 1000 / duration) {
602 flow_limit = MIN(ofproto_flow_limit, MAX(flow_limit, 1000));
603 atomic_store(&udpif->flow_limit, flow_limit);
605 if (duration > 2000) {
606 VLOG_INFO("Spent an unreasonably long %lldms dumping flows",
610 poll_timer_wait_until(start_time + MIN(max_idle, 500));
611 seq_wait(udpif->reval_seq, udpif->last_reval_seq);
612 latch_wait(&udpif->exit_latch);
619 /* The miss handler thread is responsible for processing miss upcalls retrieved
620 * by the dispatcher thread. Once finished it passes the processed miss
621 * upcalls to ofproto-dpif where they're installed in the datapath. */
623 udpif_upcall_handler(void *arg)
625 struct handler *handler = arg;
627 handler->name = xasprintf("handler_%u", ovsthread_id_self());
628 set_subprogram_name("%s", handler->name);
631 struct list misses = LIST_INITIALIZER(&misses);
634 ovs_mutex_lock(&handler->mutex);
636 if (latch_is_set(&handler->udpif->exit_latch)) {
637 ovs_mutex_unlock(&handler->mutex);
641 if (!handler->n_upcalls) {
642 ovs_mutex_cond_wait(&handler->wake_cond, &handler->mutex);
645 for (i = 0; i < FLOW_MISS_MAX_BATCH; i++) {
646 if (handler->n_upcalls) {
647 handler->n_upcalls--;
648 list_push_back(&misses, list_pop_front(&handler->upcalls));
653 ovs_mutex_unlock(&handler->mutex);
655 handle_upcalls(handler, &misses);
662 udpif_revalidator(void *arg)
664 struct revalidator *revalidator = arg;
666 revalidator->name = xasprintf("revalidator_%u", ovsthread_id_self());
667 set_subprogram_name("%s", revalidator->name);
669 struct list udumps = LIST_INITIALIZER(&udumps);
670 struct udpif *udpif = revalidator->udpif;
673 ovs_mutex_lock(&revalidator->mutex);
674 if (latch_is_set(&udpif->exit_latch)) {
675 ovs_mutex_unlock(&revalidator->mutex);
679 if (!revalidator->n_udumps) {
680 if (revalidator->dump_seq != seq_read(udpif->dump_seq)) {
681 revalidator->dump_seq = seq_read(udpif->dump_seq);
682 revalidator_sweep(revalidator);
684 ovs_mutex_cond_wait(&revalidator->wake_cond,
685 &revalidator->mutex);
689 for (i = 0; i < REVALIDATE_MAX_BATCH && revalidator->n_udumps; i++) {
690 list_push_back(&udumps, list_pop_front(&revalidator->udumps));
691 revalidator->n_udumps--;
694 /* Wake up the flow dumper. */
695 xpthread_cond_signal(&revalidator->wake_cond);
696 ovs_mutex_unlock(&revalidator->mutex);
698 if (!list_is_empty(&udumps)) {
699 revalidate_udumps(revalidator, &udumps);
706 static enum upcall_type
707 classify_upcall(const struct upcall *upcall)
709 const struct dpif_upcall *dpif_upcall = &upcall->dpif_upcall;
710 union user_action_cookie cookie;
713 /* First look at the upcall type. */
714 switch (dpif_upcall->type) {
721 case DPIF_N_UC_TYPES:
723 VLOG_WARN_RL(&rl, "upcall has unexpected type %"PRIu32,
728 /* "action" upcalls need a closer look. */
729 if (!dpif_upcall->userdata) {
730 VLOG_WARN_RL(&rl, "action upcall missing cookie");
733 userdata_len = nl_attr_get_size(dpif_upcall->userdata);
734 if (userdata_len < sizeof cookie.type
735 || userdata_len > sizeof cookie) {
736 VLOG_WARN_RL(&rl, "action upcall cookie has unexpected size %"PRIuSIZE,
740 memset(&cookie, 0, sizeof cookie);
741 memcpy(&cookie, nl_attr_get(dpif_upcall->userdata), userdata_len);
742 if (userdata_len == sizeof cookie.sflow
743 && cookie.type == USER_ACTION_COOKIE_SFLOW) {
745 } else if (userdata_len == sizeof cookie.slow_path
746 && cookie.type == USER_ACTION_COOKIE_SLOW_PATH) {
748 } else if (userdata_len == sizeof cookie.flow_sample
749 && cookie.type == USER_ACTION_COOKIE_FLOW_SAMPLE) {
750 return FLOW_SAMPLE_UPCALL;
751 } else if (userdata_len == sizeof cookie.ipfix
752 && cookie.type == USER_ACTION_COOKIE_IPFIX) {
755 VLOG_WARN_RL(&rl, "invalid user cookie of type %"PRIu16
756 " and size %"PRIuSIZE, cookie.type, userdata_len);
762 recv_upcalls(struct udpif *udpif)
767 uint32_t hash = udpif->secret;
768 struct handler *handler;
769 struct upcall *upcall;
770 size_t n_bytes, left;
774 upcall = xmalloc(sizeof *upcall);
775 ofpbuf_use_stub(&upcall->upcall_buf, upcall->upcall_stub,
776 sizeof upcall->upcall_stub);
777 error = dpif_recv(udpif->dpif, &upcall->dpif_upcall,
778 &upcall->upcall_buf);
780 /* upcall_destroy() can only be called on successfully received
782 ofpbuf_uninit(&upcall->upcall_buf);
788 NL_ATTR_FOR_EACH (nla, left, upcall->dpif_upcall.key,
789 upcall->dpif_upcall.key_len) {
790 enum ovs_key_attr type = nl_attr_type(nla);
791 if (type == OVS_KEY_ATTR_IN_PORT
792 || type == OVS_KEY_ATTR_TCP
793 || type == OVS_KEY_ATTR_UDP) {
794 if (nl_attr_get_size(nla) == 4) {
795 hash = mhash_add(hash, nl_attr_get_u32(nla));
799 "Netlink attribute with incorrect size.");
803 hash = mhash_finish(hash, n_bytes);
805 handler = &udpif->handlers[hash % udpif->n_handlers];
807 ovs_mutex_lock(&handler->mutex);
808 if (handler->n_upcalls < MAX_QUEUE_LENGTH) {
809 list_push_back(&handler->upcalls, &upcall->list_node);
810 if (handler->n_upcalls == 0) {
811 handler->need_signal = true;
813 handler->n_upcalls++;
814 if (handler->need_signal &&
815 handler->n_upcalls >= FLOW_MISS_MAX_BATCH) {
816 handler->need_signal = false;
817 xpthread_cond_signal(&handler->wake_cond);
819 ovs_mutex_unlock(&handler->mutex);
820 if (!VLOG_DROP_DBG(&rl)) {
821 struct ds ds = DS_EMPTY_INITIALIZER;
823 odp_flow_key_format(upcall->dpif_upcall.key,
824 upcall->dpif_upcall.key_len,
826 VLOG_DBG("dispatcher: enqueue (%s)", ds_cstr(&ds));
830 ovs_mutex_unlock(&handler->mutex);
831 COVERAGE_INC(upcall_queue_overflow);
832 upcall_destroy(upcall);
836 for (n = 0; n < udpif->n_handlers; ++n) {
837 struct handler *handler = &udpif->handlers[n];
839 if (handler->need_signal) {
840 handler->need_signal = false;
841 ovs_mutex_lock(&handler->mutex);
842 xpthread_cond_signal(&handler->wake_cond);
843 ovs_mutex_unlock(&handler->mutex);
848 /* Calculates slow path actions for 'xout'. 'buf' must statically be
849 * initialized with at least 128 bytes of space. */
851 compose_slow_path(struct udpif *udpif, struct xlate_out *xout,
852 odp_port_t odp_in_port, struct ofpbuf *buf)
854 union user_action_cookie cookie;
858 cookie.type = USER_ACTION_COOKIE_SLOW_PATH;
859 cookie.slow_path.unused = 0;
860 cookie.slow_path.reason = xout->slow;
862 port = xout->slow & (SLOW_CFM | SLOW_BFD | SLOW_LACP | SLOW_STP)
865 pid = dpif_port_get_pid(udpif->dpif, port);
866 odp_put_userspace_action(pid, &cookie, sizeof cookie.slow_path, buf);
869 static struct flow_miss *
870 flow_miss_find(struct hmap *todo, const struct ofproto_dpif *ofproto,
871 const struct flow *flow, uint32_t hash)
873 struct flow_miss *miss;
875 HMAP_FOR_EACH_WITH_HASH (miss, hmap_node, hash, todo) {
876 if (miss->ofproto == ofproto && flow_equal(&miss->flow, flow)) {
885 handle_upcalls(struct handler *handler, struct list *upcalls)
887 struct hmap misses = HMAP_INITIALIZER(&misses);
888 struct udpif *udpif = handler->udpif;
890 struct flow_miss miss_buf[FLOW_MISS_MAX_BATCH];
891 struct dpif_op *opsp[FLOW_MISS_MAX_BATCH * 2];
892 struct dpif_op ops[FLOW_MISS_MAX_BATCH * 2];
893 struct flow_miss *miss, *next_miss;
894 struct upcall *upcall, *next;
895 size_t n_misses, n_ops, i;
896 unsigned int flow_limit;
897 bool fail_open, may_put;
898 enum upcall_type type;
900 atomic_read(&udpif->flow_limit, &flow_limit);
901 may_put = udpif_get_n_flows(udpif) < flow_limit;
903 /* Extract the flow from each upcall. Construct in 'misses' a hash table
904 * that maps each unique flow to a 'struct flow_miss'.
906 * Most commonly there is a single packet per flow_miss, but there are
907 * several reasons why there might be more than one, e.g.:
909 * - The dpif packet interface does not support TSO (or UFO, etc.), so a
910 * large packet sent to userspace is split into a sequence of smaller
913 * - A stream of quickly arriving packets in an established "slow-pathed"
916 * - Rarely, a stream of quickly arriving packets in a flow not yet
917 * established. (This is rare because most protocols do not send
918 * multiple back-to-back packets before receiving a reply from the
919 * other end of the connection, which gives OVS a chance to set up a
923 LIST_FOR_EACH_SAFE (upcall, next, list_node, upcalls) {
924 struct dpif_upcall *dupcall = &upcall->dpif_upcall;
925 struct flow_miss *miss = &miss_buf[n_misses];
926 struct ofpbuf *packet = &dupcall->packet;
927 struct flow_miss *existing_miss;
928 struct ofproto_dpif *ofproto;
929 struct dpif_sflow *sflow;
930 struct dpif_ipfix *ipfix;
931 odp_port_t odp_in_port;
935 error = xlate_receive(udpif->backer, packet, dupcall->key,
936 dupcall->key_len, &flow, &miss->key_fitness,
937 &ofproto, &ipfix, &sflow, NULL, &odp_in_port);
939 if (error == ENODEV) {
940 /* Received packet on datapath port for which we couldn't
941 * associate an ofproto. This can happen if a port is removed
942 * while traffic is being received. Print a rate-limited
943 * message in case it happens frequently. Install a drop flow
944 * so that future packets of the flow are inexpensively dropped
946 VLOG_INFO_RL(&rl, "received packet on unassociated datapath "
947 "port %"PRIu32, odp_in_port);
948 dpif_flow_put(udpif->dpif, DPIF_FP_CREATE | DPIF_FP_MODIFY,
949 dupcall->key, dupcall->key_len, NULL, 0, NULL, 0,
952 list_remove(&upcall->list_node);
953 upcall_destroy(upcall);
957 type = classify_upcall(upcall);
958 if (type == MISS_UPCALL) {
961 flow_extract(packet, flow.skb_priority, flow.pkt_mark,
962 &flow.tunnel, &flow.in_port, &miss->flow);
964 hash = flow_hash(&miss->flow, 0);
965 existing_miss = flow_miss_find(&misses, ofproto, &miss->flow,
967 if (!existing_miss) {
968 hmap_insert(&misses, &miss->hmap_node, hash);
969 miss->ofproto = ofproto;
970 miss->key = dupcall->key;
971 miss->key_len = dupcall->key_len;
972 miss->upcall_type = dupcall->type;
973 miss->stats.n_packets = 0;
974 miss->stats.n_bytes = 0;
975 miss->stats.used = time_msec();
976 miss->stats.tcp_flags = 0;
977 miss->odp_in_port = odp_in_port;
982 miss = existing_miss;
984 miss->stats.tcp_flags |= packet_get_tcp_flags(packet, &miss->flow);
985 miss->stats.n_bytes += packet->size;
986 miss->stats.n_packets++;
988 upcall->flow_miss = miss;
995 union user_action_cookie cookie;
997 memset(&cookie, 0, sizeof cookie);
998 memcpy(&cookie, nl_attr_get(dupcall->userdata),
999 sizeof cookie.sflow);
1000 dpif_sflow_received(sflow, packet, &flow, odp_in_port,
1006 dpif_ipfix_bridge_sample(ipfix, packet, &flow);
1009 case FLOW_SAMPLE_UPCALL:
1011 union user_action_cookie cookie;
1013 memset(&cookie, 0, sizeof cookie);
1014 memcpy(&cookie, nl_attr_get(dupcall->userdata),
1015 sizeof cookie.flow_sample);
1017 /* The flow reflects exactly the contents of the packet.
1018 * Sample the packet using it. */
1019 dpif_ipfix_flow_sample(ipfix, packet, &flow,
1020 cookie.flow_sample.collector_set_id,
1021 cookie.flow_sample.probability,
1022 cookie.flow_sample.obs_domain_id,
1023 cookie.flow_sample.obs_point_id);
1032 dpif_ipfix_unref(ipfix);
1033 dpif_sflow_unref(sflow);
1035 list_remove(&upcall->list_node);
1036 upcall_destroy(upcall);
1039 /* Initialize each 'struct flow_miss's ->xout.
1041 * We do this per-flow_miss rather than per-packet because, most commonly,
1042 * all the packets in a flow can use the same translation.
1044 * We can't do this in the previous loop because we need the TCP flags for
1045 * all the packets in each miss. */
1047 HMAP_FOR_EACH (miss, hmap_node, &misses) {
1048 struct xlate_in xin;
1050 xlate_in_init(&xin, miss->ofproto, &miss->flow, NULL,
1051 miss->stats.tcp_flags, NULL);
1052 xin.may_learn = true;
1054 if (miss->upcall_type == DPIF_UC_MISS) {
1055 xin.resubmit_stats = &miss->stats;
1057 /* For non-miss upcalls, there's a flow in the datapath which this
1058 * packet was accounted to. Presumably the revalidators will deal
1059 * with pushing its stats eventually. */
1062 xlate_actions(&xin, &miss->xout);
1063 fail_open = fail_open || miss->xout.fail_open;
1066 /* Now handle the packets individually in order of arrival. In the common
1067 * case each packet of a miss can share the same actions, but slow-pathed
1068 * packets need to be translated individually:
1070 * - For SLOW_CFM, SLOW_LACP, SLOW_STP, and SLOW_BFD, translation is what
1071 * processes received packets for these protocols.
1073 * - For SLOW_CONTROLLER, translation sends the packet to the OpenFlow
1076 * The loop fills 'ops' with an array of operations to execute in the
1079 LIST_FOR_EACH (upcall, list_node, upcalls) {
1080 struct flow_miss *miss = upcall->flow_miss;
1081 struct ofpbuf *packet = &upcall->dpif_upcall.packet;
1083 ovs_be16 flow_vlan_tci;
1085 /* Save a copy of flow.vlan_tci in case it is changed to
1086 * generate proper mega flow masks for VLAN splinter flows. */
1087 flow_vlan_tci = miss->flow.vlan_tci;
1089 if (miss->xout.slow) {
1090 struct xlate_in xin;
1092 xlate_in_init(&xin, miss->ofproto, &miss->flow, NULL, 0, packet);
1093 xlate_actions_for_side_effects(&xin);
1096 if (miss->flow.in_port.ofp_port
1097 != vsp_realdev_to_vlandev(miss->ofproto,
1098 miss->flow.in_port.ofp_port,
1099 miss->flow.vlan_tci)) {
1100 /* This packet was received on a VLAN splinter port. We
1101 * added a VLAN to the packet to make the packet resemble
1102 * the flow, but the actions were composed assuming that
1103 * the packet contained no VLAN. So, we must remove the
1104 * VLAN header from the packet before trying to execute the
1106 if (miss->xout.odp_actions.size) {
1107 eth_pop_vlan(packet);
1110 /* Remove the flow vlan tags inserted by vlan splinter logic
1111 * to ensure megaflow masks generated match the data path flow. */
1112 miss->flow.vlan_tci = 0;
1115 /* Do not install a flow into the datapath if:
1117 * - The datapath already has too many flows.
1119 * - An earlier iteration of this loop already put the same flow.
1121 * - We received this packet via some flow installed in the kernel
1125 && upcall->dpif_upcall.type == DPIF_UC_MISS) {
1131 atomic_read(&enable_megaflows, &megaflow);
1132 ofpbuf_use_stack(&mask, &miss->mask_buf, sizeof miss->mask_buf);
1134 odp_flow_key_from_mask(&mask, &miss->xout.wc.masks,
1135 &miss->flow, UINT32_MAX);
1139 op->type = DPIF_OP_FLOW_PUT;
1140 op->u.flow_put.flags = DPIF_FP_CREATE | DPIF_FP_MODIFY;
1141 op->u.flow_put.key = miss->key;
1142 op->u.flow_put.key_len = miss->key_len;
1143 op->u.flow_put.mask = mask.data;
1144 op->u.flow_put.mask_len = mask.size;
1145 op->u.flow_put.stats = NULL;
1147 if (!miss->xout.slow) {
1148 op->u.flow_put.actions = miss->xout.odp_actions.data;
1149 op->u.flow_put.actions_len = miss->xout.odp_actions.size;
1153 ofpbuf_use_stack(&buf, miss->slow_path_buf,
1154 sizeof miss->slow_path_buf);
1155 compose_slow_path(udpif, &miss->xout, miss->odp_in_port, &buf);
1156 op->u.flow_put.actions = buf.data;
1157 op->u.flow_put.actions_len = buf.size;
1162 * The 'miss' may be shared by multiple upcalls. Restore
1163 * the saved flow vlan_tci field before processing the next
1165 miss->flow.vlan_tci = flow_vlan_tci;
1167 if (miss->xout.odp_actions.size) {
1170 op->type = DPIF_OP_EXECUTE;
1171 op->u.execute.key = miss->key;
1172 op->u.execute.key_len = miss->key_len;
1173 op->u.execute.packet = packet;
1174 op->u.execute.actions = miss->xout.odp_actions.data;
1175 op->u.execute.actions_len = miss->xout.odp_actions.size;
1176 op->u.execute.needs_help = (miss->xout.slow & SLOW_ACTION) != 0;
1180 /* Special case for fail-open mode.
1182 * If we are in fail-open mode, but we are connected to a controller too,
1183 * then we should send the packet up to the controller in the hope that it
1184 * will try to set up a flow and thereby allow us to exit fail-open.
1186 * See the top-level comment in fail-open.c for more information.
1188 * Copy packets before they are modified by execution. */
1190 LIST_FOR_EACH (upcall, list_node, upcalls) {
1191 struct flow_miss *miss = upcall->flow_miss;
1192 struct ofpbuf *packet = &upcall->dpif_upcall.packet;
1193 struct ofproto_packet_in *pin;
1195 pin = xmalloc(sizeof *pin);
1196 pin->up.packet = xmemdup(packet->data, packet->size);
1197 pin->up.packet_len = packet->size;
1198 pin->up.reason = OFPR_NO_MATCH;
1199 pin->up.table_id = 0;
1200 pin->up.cookie = OVS_BE64_MAX;
1201 flow_get_metadata(&miss->flow, &pin->up.fmd);
1202 pin->send_len = 0; /* Not used for flow table misses. */
1203 pin->generated_by_table_miss = false;
1204 ofproto_dpif_send_packet_in(miss->ofproto, pin);
1208 /* Execute batch. */
1209 for (i = 0; i < n_ops; i++) {
1212 dpif_operate(udpif->dpif, opsp, n_ops);
1214 HMAP_FOR_EACH_SAFE (miss, next_miss, hmap_node, &misses) {
1215 hmap_remove(&misses, &miss->hmap_node);
1216 xlate_out_uninit(&miss->xout);
1218 hmap_destroy(&misses);
1220 LIST_FOR_EACH_SAFE (upcall, next, list_node, upcalls) {
1221 list_remove(&upcall->list_node);
1222 upcall_destroy(upcall);
1226 static struct udpif_key *
1227 ukey_lookup(struct revalidator *revalidator, struct udpif_flow_dump *udump)
1229 struct udpif_key *ukey;
1231 HMAP_FOR_EACH_WITH_HASH (ukey, hmap_node, udump->key_hash,
1232 &revalidator->ukeys) {
1233 if (ukey->key_len == udump->key_len
1234 && !memcmp(ukey->key, udump->key, udump->key_len)) {
1242 ukey_delete(struct revalidator *revalidator, struct udpif_key *ukey)
1244 hmap_remove(&revalidator->ukeys, &ukey->hmap_node);
1249 revalidate_ukey(struct udpif *udpif, struct udpif_flow_dump *udump,
1250 struct udpif_key *ukey)
1252 struct ofpbuf xout_actions, *actions;
1253 uint64_t slow_path_buf[128 / 8];
1254 struct xlate_out xout, *xoutp;
1255 struct flow flow, udump_mask;
1256 struct ofproto_dpif *ofproto;
1257 struct dpif_flow_stats push;
1258 uint32_t *udump32, *xout32;
1259 odp_port_t odp_in_port;
1260 struct xlate_in xin;
1269 /* If we don't need to revalidate, we can simply push the stats contained
1270 * in the udump, otherwise we'll have to get the actions so we can check
1272 if (udump->need_revalidate) {
1273 if (dpif_flow_get(udpif->dpif, ukey->key, ukey->key_len, &actions,
1279 push.used = udump->stats.used;
1280 push.tcp_flags = udump->stats.tcp_flags;
1281 push.n_packets = udump->stats.n_packets > ukey->stats.n_packets
1282 ? udump->stats.n_packets - ukey->stats.n_packets
1284 push.n_bytes = udump->stats.n_bytes > ukey->stats.n_bytes
1285 ? udump->stats.n_bytes - ukey->stats.n_bytes
1287 ukey->stats = udump->stats;
1289 if (!push.n_packets && !udump->need_revalidate) {
1294 error = xlate_receive(udpif->backer, NULL, ukey->key, ukey->key_len, &flow,
1295 NULL, &ofproto, NULL, NULL, NULL, &odp_in_port);
1300 xlate_in_init(&xin, ofproto, &flow, NULL, push.tcp_flags, NULL);
1301 xin.resubmit_stats = push.n_packets ? &push : NULL;
1302 xin.may_learn = push.n_packets > 0;
1303 xin.skip_wildcards = !udump->need_revalidate;
1304 xlate_actions(&xin, &xout);
1307 if (!udump->need_revalidate) {
1313 ofpbuf_use_const(&xout_actions, xout.odp_actions.data,
1314 xout.odp_actions.size);
1316 ofpbuf_use_stack(&xout_actions, slow_path_buf, sizeof slow_path_buf);
1317 compose_slow_path(udpif, &xout, odp_in_port, &xout_actions);
1320 if (!ofpbuf_equal(&xout_actions, actions)) {
1324 if (odp_flow_key_to_mask(udump->mask, udump->mask_len, &udump_mask, &flow)
1329 /* Since the kernel is free to ignore wildcarded bits in the mask, we can't
1330 * directly check that the masks are the same. Instead we check that the
1331 * mask in the kernel is more specific i.e. less wildcarded, than what
1332 * we've calculated here. This guarantees we don't catch any packets we
1333 * shouldn't with the megaflow. */
1334 udump32 = (uint32_t *) &udump_mask;
1335 xout32 = (uint32_t *) &xout.wc.masks;
1336 for (i = 0; i < FLOW_U32S; i++) {
1337 if ((udump32[i] | xout32[i]) != udump32[i]) {
1344 ofpbuf_delete(actions);
1345 xlate_out_uninit(xoutp);
1350 revalidate_udumps(struct revalidator *revalidator, struct list *udumps)
1352 struct udpif *udpif = revalidator->udpif;
1355 struct dpif_flow_stats ukey_stats; /* Stats stored in the ukey. */
1356 struct dpif_flow_stats stats; /* Stats for 'op'. */
1357 struct dpif_op op; /* Flow del operation. */
1358 } ops[REVALIDATE_MAX_BATCH];
1360 struct dpif_op *opsp[REVALIDATE_MAX_BATCH];
1361 struct udpif_flow_dump *udump, *next_udump;
1362 size_t n_ops, i, n_flows;
1363 unsigned int flow_limit;
1364 long long int max_idle;
1367 atomic_read(&udpif->max_idle, &max_idle);
1368 atomic_read(&udpif->flow_limit, &flow_limit);
1370 n_flows = udpif_get_n_flows(udpif);
1373 if (n_flows > flow_limit) {
1374 must_del = n_flows > 2 * flow_limit;
1379 LIST_FOR_EACH_SAFE (udump, next_udump, list_node, udumps) {
1380 long long int used, now;
1381 struct udpif_key *ukey;
1384 ukey = ukey_lookup(revalidator, udump);
1386 used = udump->stats.used;
1387 if (!used && ukey) {
1388 used = ukey->created;
1391 if (must_del || (used && used < now - max_idle)) {
1392 struct dpif_flow_stats *ukey_stats = &ops[n_ops].ukey_stats;
1393 struct dpif_op *op = &ops[n_ops].op;
1395 op->type = DPIF_OP_FLOW_DEL;
1396 op->u.flow_del.key = udump->key;
1397 op->u.flow_del.key_len = udump->key_len;
1398 op->u.flow_del.stats = &ops[n_ops].stats;
1402 *ukey_stats = ukey->stats;
1403 ukey_delete(revalidator, ukey);
1405 memset(ukey_stats, 0, sizeof *ukey_stats);
1412 ukey = xmalloc(sizeof *ukey);
1414 ukey->key = (struct nlattr *) &ukey->key_buf;
1415 memcpy(ukey->key, udump->key, udump->key_len);
1416 ukey->key_len = udump->key_len;
1418 ukey->created = used ? used : now;
1419 memset(&ukey->stats, 0, sizeof ukey->stats);
1423 hmap_insert(&revalidator->ukeys, &ukey->hmap_node,
1428 if (!revalidate_ukey(udpif, udump, ukey)) {
1429 dpif_flow_del(udpif->dpif, udump->key, udump->key_len, NULL);
1430 ukey_delete(revalidator, ukey);
1433 list_remove(&udump->list_node);
1437 for (i = 0; i < n_ops; i++) {
1438 opsp[i] = &ops[i].op;
1440 dpif_operate(udpif->dpif, opsp, n_ops);
1442 for (i = 0; i < n_ops; i++) {
1443 struct dpif_flow_stats push, *stats, *ukey_stats;
1445 ukey_stats = &ops[i].ukey_stats;
1446 stats = ops[i].op.u.flow_del.stats;
1447 push.used = MAX(stats->used, ukey_stats->used);
1448 push.tcp_flags = stats->tcp_flags | ukey_stats->tcp_flags;
1449 push.n_packets = stats->n_packets - ukey_stats->n_packets;
1450 push.n_bytes = stats->n_bytes - ukey_stats->n_bytes;
1452 if (push.n_packets || netflow_exists()) {
1453 struct ofproto_dpif *ofproto;
1454 struct netflow *netflow;
1457 if (!xlate_receive(udpif->backer, NULL, ops[i].op.u.flow_del.key,
1458 ops[i].op.u.flow_del.key_len, &flow, NULL,
1459 &ofproto, NULL, NULL, &netflow, NULL)) {
1460 struct xlate_in xin;
1462 xlate_in_init(&xin, ofproto, &flow, NULL, push.tcp_flags,
1464 xin.resubmit_stats = push.n_packets ? &push : NULL;
1465 xin.may_learn = push.n_packets > 0;
1466 xin.skip_wildcards = true;
1467 xlate_actions_for_side_effects(&xin);
1470 netflow_expire(netflow, &flow);
1471 netflow_flow_clear(netflow, &flow);
1472 netflow_unref(netflow);
1478 LIST_FOR_EACH_SAFE (udump, next_udump, list_node, udumps) {
1479 list_remove(&udump->list_node);
1485 revalidator_sweep(struct revalidator *revalidator)
1487 struct udpif_key *ukey, *next;
1489 HMAP_FOR_EACH_SAFE (ukey, next, hmap_node, &revalidator->ukeys) {
1493 ukey_delete(revalidator, ukey);
1499 upcall_unixctl_show(struct unixctl_conn *conn, int argc OVS_UNUSED,
1500 const char *argv[] OVS_UNUSED, void *aux OVS_UNUSED)
1502 struct ds ds = DS_EMPTY_INITIALIZER;
1503 struct udpif *udpif;
1505 LIST_FOR_EACH (udpif, list_node, &all_udpifs) {
1506 unsigned int flow_limit;
1507 long long int max_idle;
1510 atomic_read(&udpif->flow_limit, &flow_limit);
1511 atomic_read(&udpif->max_idle, &max_idle);
1513 ds_put_format(&ds, "%s:\n", dpif_name(udpif->dpif));
1514 ds_put_format(&ds, "\tflows : (current %"PRIu64")"
1515 " (avg %u) (max %u) (limit %u)\n", udpif_get_n_flows(udpif),
1516 udpif->avg_n_flows, udpif->max_n_flows, flow_limit);
1517 ds_put_format(&ds, "\tmax idle : %lldms\n", max_idle);
1518 ds_put_format(&ds, "\tdump duration : %lldms\n", udpif->dump_duration);
1520 ds_put_char(&ds, '\n');
1521 for (i = 0; i < udpif->n_handlers; i++) {
1522 struct handler *handler = &udpif->handlers[i];
1524 ovs_mutex_lock(&handler->mutex);
1525 ds_put_format(&ds, "\t%s: (upcall queue %"PRIuSIZE")\n",
1526 handler->name, handler->n_upcalls);
1527 ovs_mutex_unlock(&handler->mutex);
1530 ds_put_char(&ds, '\n');
1531 for (i = 0; i < n_revalidators; i++) {
1532 struct revalidator *revalidator = &udpif->revalidators[i];
1534 /* XXX: The result of hmap_count(&revalidator->ukeys) may not be
1535 * accurate because it's not protected by the revalidator mutex. */
1536 ovs_mutex_lock(&revalidator->mutex);
1537 ds_put_format(&ds, "\t%s: (dump queue %"PRIuSIZE") (keys %"PRIuSIZE
1538 ")\n", revalidator->name, revalidator->n_udumps,
1539 hmap_count(&revalidator->ukeys));
1540 ovs_mutex_unlock(&revalidator->mutex);
1544 unixctl_command_reply(conn, ds_cstr(&ds));
1548 /* Disable using the megaflows.
1550 * This command is only needed for advanced debugging, so it's not
1551 * documented in the man page. */
1553 upcall_unixctl_disable_megaflows(struct unixctl_conn *conn,
1554 int argc OVS_UNUSED,
1555 const char *argv[] OVS_UNUSED,
1556 void *aux OVS_UNUSED)
1558 atomic_store(&enable_megaflows, false);
1560 unixctl_command_reply(conn, "megaflows disabled");
1563 /* Re-enable using megaflows.
1565 * This command is only needed for advanced debugging, so it's not
1566 * documented in the man page. */
1568 upcall_unixctl_enable_megaflows(struct unixctl_conn *conn,
1569 int argc OVS_UNUSED,
1570 const char *argv[] OVS_UNUSED,
1571 void *aux OVS_UNUSED)
1573 atomic_store(&enable_megaflows, true);
1575 unixctl_command_reply(conn, "megaflows enabled");