2 * Copyright (c) 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016 Nicira, Inc.
3 * Copyright (c) 2009 InMon Corp.
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at:
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
19 #include "ofproto-dpif-sflow.h"
21 #include <sys/resource.h>
22 #include <sys/socket.h>
25 #include "collectors.h"
29 #include "openvswitch/hmap.h"
32 #include "openvswitch/ofpbuf.h"
35 #include "poll-loop.h"
36 #include "ovs-router.h"
37 #include "route-table.h"
38 #include "sflow_api.h"
39 #include "socket-util.h"
41 #include "openvswitch/vlog.h"
42 #include "lib/odp-util.h"
43 #include "lib/unaligned.h"
44 #include "ofproto-provider.h"
47 VLOG_DEFINE_THIS_MODULE(sflow);
49 static struct ovs_mutex mutex;
51 /* This global var is used to determine which sFlow
52 sub-agent should send the datapath counters. */
53 #define SFLOW_GC_SUBID_UNCLAIMED (uint32_t)-1
54 static uint32_t sflow_global_counters_subid = SFLOW_GC_SUBID_UNCLAIMED;
57 * The enum dpif_sflow_tunnel_type is to declare the types supported
59 enum dpif_sflow_tunnel_type {
60 DPIF_SFLOW_TUNNEL_UNKNOWN = 0,
61 DPIF_SFLOW_TUNNEL_VXLAN,
62 DPIF_SFLOW_TUNNEL_GRE,
63 DPIF_SFLOW_TUNNEL_LISP,
64 DPIF_SFLOW_TUNNEL_IPSEC_GRE,
65 DPIF_SFLOW_TUNNEL_GENEVE
68 struct dpif_sflow_port {
69 struct hmap_node hmap_node; /* In struct dpif_sflow's "ports" hmap. */
70 SFLDataSource_instance dsi; /* sFlow library's notion of port number. */
71 struct ofport *ofport; /* To retrive port stats. */
73 enum dpif_sflow_tunnel_type tunnel_type;
77 struct collectors *collectors;
78 SFLAgent *sflow_agent;
79 struct ofproto_sflow_options *options;
81 size_t n_flood, n_all;
82 struct hmap ports; /* Contains "struct dpif_sflow_port"s. */
84 struct ovs_refcount ref_cnt;
87 static void dpif_sflow_del_port__(struct dpif_sflow *,
88 struct dpif_sflow_port *);
90 #define RECEIVER_INDEX 1
92 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
95 ofproto_sflow_options_equal(const struct ofproto_sflow_options *a,
96 const struct ofproto_sflow_options *b)
98 return (sset_equals(&a->targets, &b->targets)
99 && a->sampling_rate == b->sampling_rate
100 && a->polling_interval == b->polling_interval
101 && a->header_len == b->header_len
102 && a->sub_id == b->sub_id
103 && nullable_string_is_equal(a->agent_device, b->agent_device)
104 && nullable_string_is_equal(a->control_ip, b->control_ip));
107 static struct ofproto_sflow_options *
108 ofproto_sflow_options_clone(const struct ofproto_sflow_options *old)
110 struct ofproto_sflow_options *new = xmemdup(old, sizeof *old);
111 sset_clone(&new->targets, &old->targets);
112 new->agent_device = nullable_xstrdup(old->agent_device);
113 new->control_ip = nullable_xstrdup(old->control_ip);
118 ofproto_sflow_options_destroy(struct ofproto_sflow_options *options)
121 sset_destroy(&options->targets);
122 free(options->agent_device);
123 free(options->control_ip);
128 /* sFlow library callback to allocate memory. */
130 sflow_agent_alloc_cb(void *magic OVS_UNUSED, SFLAgent *agent OVS_UNUSED,
133 return xzalloc(bytes);
136 /* sFlow library callback to free memory. */
138 sflow_agent_free_cb(void *magic OVS_UNUSED, SFLAgent *agent OVS_UNUSED,
145 /* sFlow library callback to report error. */
147 sflow_agent_error_cb(void *magic OVS_UNUSED, SFLAgent *agent OVS_UNUSED,
150 VLOG_WARN("sFlow agent error: %s", msg);
153 /* sFlow library callback to send datagram. */
155 sflow_agent_send_packet_cb(void *ds_, SFLAgent *agent OVS_UNUSED,
156 SFLReceiver *receiver OVS_UNUSED, u_char *pkt,
159 struct dpif_sflow *ds = ds_;
160 collectors_send(ds->collectors, pkt, pktLen);
163 static struct dpif_sflow_port *
164 dpif_sflow_find_port(const struct dpif_sflow *ds, odp_port_t odp_port)
167 struct dpif_sflow_port *dsp;
169 HMAP_FOR_EACH_IN_BUCKET (dsp, hmap_node, hash_odp_port(odp_port),
171 if (dsp->odp_port == odp_port) {
178 /* Call to get the datapath stats. Modeled after the dpctl utility.
180 * It might be more efficient for this module to be given a handle it can use
181 * to get these stats more efficiently, but this is only going to be called
182 * once every 20-30 seconds. Return number of datapaths found (normally expect
185 sflow_get_dp_stats(struct dpif_sflow *ds OVS_UNUSED,
186 struct dpif_dp_stats *dp_totals)
192 memset(dp_totals, 0, sizeof *dp_totals);
194 dp_enumerate_types(&types);
195 SSET_FOR_EACH (type, &types) {
199 if (dp_enumerate_names(type, &names) == 0) {
200 SSET_FOR_EACH (name, &names) {
202 if (dpif_open(name, type, &dpif) == 0) {
203 struct dpif_dp_stats dp_stats;
204 if (dpif_get_dp_stats(dpif, &dp_stats) == 0) {
206 dp_totals->n_hit += dp_stats.n_hit;
207 dp_totals->n_missed += dp_stats.n_missed;
208 dp_totals->n_lost += dp_stats.n_lost;
209 dp_totals->n_flows += dp_stats.n_flows;
210 dp_totals->n_mask_hit += dp_stats.n_mask_hit;
211 dp_totals->n_masks += dp_stats.n_masks;
216 sset_destroy(&names);
219 sset_destroy(&types);
223 /* If there are multiple bridges defined then we need some
224 minimal artibration to decide which one should send the
225 global counters. This function allows each sub-agent to
226 ask if he should do it or not. */
228 sflow_global_counters_subid_test(uint32_t subid)
231 if (sflow_global_counters_subid == SFLOW_GC_SUBID_UNCLAIMED) {
232 /* The role is up for grabs. */
233 sflow_global_counters_subid = subid;
235 return (sflow_global_counters_subid == subid);
239 sflow_global_counters_subid_clear(uint32_t subid)
242 if (sflow_global_counters_subid == subid) {
243 /* The sub-agent that was sending global counters
244 is going away, so reset to allow another
246 sflow_global_counters_subid = SFLOW_GC_SUBID_UNCLAIMED;
251 sflow_agent_get_global_counters(void *ds_, SFLPoller *poller,
252 SFL_COUNTERS_SAMPLE_TYPE *cs)
255 struct dpif_sflow *ds = ds_;
256 SFLCounters_sample_element dp_elem, res_elem;
257 struct dpif_dp_stats dp_totals;
260 if (!sflow_global_counters_subid_test(poller->agent->subId)) {
261 /* Another sub-agent is currently responsible for this. */
266 if (sflow_get_dp_stats(ds, &dp_totals)) {
267 dp_elem.tag = SFLCOUNTERS_OVSDP;
268 dp_elem.counterBlock.ovsdp.n_hit = dp_totals.n_hit;
269 dp_elem.counterBlock.ovsdp.n_missed = dp_totals.n_missed;
270 dp_elem.counterBlock.ovsdp.n_lost = dp_totals.n_lost;
271 dp_elem.counterBlock.ovsdp.n_mask_hit = dp_totals.n_mask_hit;
272 dp_elem.counterBlock.ovsdp.n_flows = dp_totals.n_flows;
273 dp_elem.counterBlock.ovsdp.n_masks = dp_totals.n_masks;
274 SFLADD_ELEMENT(cs, &dp_elem);
278 getrusage(RUSAGE_SELF, &usage);
279 res_elem.tag = SFLCOUNTERS_APP_RESOURCES;
280 res_elem.counterBlock.appResources.user_time
281 = timeval_to_msec(&usage.ru_utime);
282 res_elem.counterBlock.appResources.system_time
283 = timeval_to_msec(&usage.ru_stime);
284 res_elem.counterBlock.appResources.mem_used = (usage.ru_maxrss * 1024);
285 SFL_UNDEF_GAUGE(res_elem.counterBlock.appResources.mem_max);
286 SFL_UNDEF_GAUGE(res_elem.counterBlock.appResources.fd_open);
287 SFL_UNDEF_GAUGE(res_elem.counterBlock.appResources.fd_max);
288 SFL_UNDEF_GAUGE(res_elem.counterBlock.appResources.conn_open);
289 SFL_UNDEF_GAUGE(res_elem.counterBlock.appResources.conn_max);
291 SFLADD_ELEMENT(cs, &res_elem);
292 sfl_poller_writeCountersSample(poller, cs);
296 sflow_agent_get_counters(void *ds_, SFLPoller *poller,
297 SFL_COUNTERS_SAMPLE_TYPE *cs)
300 struct dpif_sflow *ds = ds_;
301 SFLCounters_sample_element elem, lacp_elem, of_elem, name_elem;
302 enum netdev_features current;
303 struct dpif_sflow_port *dsp;
304 SFLIf_counters *counters;
305 struct netdev_stats stats;
306 enum netdev_flags flags;
307 struct lacp_slave_stats lacp_stats;
310 dsp = dpif_sflow_find_port(ds, u32_to_odp(poller->bridgePort));
315 elem.tag = SFLCOUNTERS_GENERIC;
316 counters = &elem.counterBlock.generic;
317 counters->ifIndex = SFL_DS_INDEX(poller->dsi);
318 counters->ifType = 6;
319 if (!netdev_get_features(dsp->ofport->netdev, ¤t, NULL, NULL, NULL)) {
320 /* The values of ifDirection come from MAU MIB (RFC 2668): 0 = unknown,
321 1 = full-duplex, 2 = half-duplex, 3 = in, 4=out */
322 counters->ifSpeed = netdev_features_to_bps(current, 0);
323 counters->ifDirection = (netdev_features_is_full_duplex(current)
326 counters->ifSpeed = 100000000;
327 counters->ifDirection = 0;
329 if (!netdev_get_flags(dsp->ofport->netdev, &flags) && flags & NETDEV_UP) {
330 counters->ifStatus = 1; /* ifAdminStatus up. */
331 if (netdev_get_carrier(dsp->ofport->netdev)) {
332 counters->ifStatus |= 2; /* ifOperStatus us. */
335 counters->ifStatus = 0; /* Down. */
339 1. Is the multicast counter filled in?
340 2. Does the multicast counter include broadcasts?
341 3. Does the rx_packets counter include multicasts/broadcasts?
343 ofproto_port_get_stats(dsp->ofport, &stats);
344 counters->ifInOctets = stats.rx_bytes;
345 counters->ifInUcastPkts = stats.rx_packets;
346 counters->ifInMulticastPkts = stats.multicast;
347 counters->ifInBroadcastPkts = -1;
348 counters->ifInDiscards = stats.rx_dropped;
349 counters->ifInErrors = stats.rx_errors;
350 counters->ifInUnknownProtos = -1;
351 counters->ifOutOctets = stats.tx_bytes;
352 counters->ifOutUcastPkts = stats.tx_packets;
353 counters->ifOutMulticastPkts = -1;
354 counters->ifOutBroadcastPkts = -1;
355 counters->ifOutDiscards = stats.tx_dropped;
356 counters->ifOutErrors = stats.tx_errors;
357 counters->ifPromiscuousMode = 0;
359 SFLADD_ELEMENT(cs, &elem);
361 /* Include LACP counters and identifiers if this port is part of a LAG. */
362 if (ofproto_port_get_lacp_stats(dsp->ofport, &lacp_stats) == 0) {
363 memset(&lacp_elem, 0, sizeof lacp_elem);
364 lacp_elem.tag = SFLCOUNTERS_LACP;
365 lacp_elem.counterBlock.lacp.actorSystemID =
366 lacp_stats.dot3adAggPortActorSystemID;
367 lacp_elem.counterBlock.lacp.partnerSystemID =
368 lacp_stats.dot3adAggPortPartnerOperSystemID;
369 lacp_elem.counterBlock.lacp.attachedAggID =
370 lacp_stats.dot3adAggPortAttachedAggID;
371 lacp_elem.counterBlock.lacp.portState.v.actorAdmin =
372 lacp_stats.dot3adAggPortActorAdminState;
373 lacp_elem.counterBlock.lacp.portState.v.actorOper =
374 lacp_stats.dot3adAggPortActorOperState;
375 lacp_elem.counterBlock.lacp.portState.v.partnerAdmin =
376 lacp_stats.dot3adAggPortPartnerAdminState;
377 lacp_elem.counterBlock.lacp.portState.v.partnerOper =
378 lacp_stats.dot3adAggPortPartnerOperState;
379 lacp_elem.counterBlock.lacp.LACPDUsRx =
380 lacp_stats.dot3adAggPortStatsLACPDUsRx;
381 SFL_UNDEF_COUNTER(lacp_elem.counterBlock.lacp.markerPDUsRx);
382 SFL_UNDEF_COUNTER(lacp_elem.counterBlock.lacp.markerResponsePDUsRx);
383 SFL_UNDEF_COUNTER(lacp_elem.counterBlock.lacp.unknownRx);
384 lacp_elem.counterBlock.lacp.illegalRx =
385 lacp_stats.dot3adAggPortStatsIllegalRx;
386 lacp_elem.counterBlock.lacp.LACPDUsTx =
387 lacp_stats.dot3adAggPortStatsLACPDUsTx;
388 SFL_UNDEF_COUNTER(lacp_elem.counterBlock.lacp.markerPDUsTx);
389 SFL_UNDEF_COUNTER(lacp_elem.counterBlock.lacp.markerResponsePDUsTx);
390 SFLADD_ELEMENT(cs, &lacp_elem);
393 /* Include Port name. */
394 if ((ifName = netdev_get_name(dsp->ofport->netdev)) != NULL) {
395 memset(&name_elem, 0, sizeof name_elem);
396 name_elem.tag = SFLCOUNTERS_PORTNAME;
397 name_elem.counterBlock.portName.portName.str = (char *)ifName;
398 name_elem.counterBlock.portName.portName.len = strlen(ifName);
399 SFLADD_ELEMENT(cs, &name_elem);
402 /* Include OpenFlow DPID and openflow port number. */
403 memset(&of_elem, 0, sizeof of_elem);
404 of_elem.tag = SFLCOUNTERS_OPENFLOWPORT;
405 of_elem.counterBlock.ofPort.datapath_id =
406 ofproto_get_datapath_id(dsp->ofport->ofproto);
407 of_elem.counterBlock.ofPort.port_no =
408 (OVS_FORCE uint32_t)dsp->ofport->ofp_port;
409 SFLADD_ELEMENT(cs, &of_elem);
411 sfl_poller_writeCountersSample(poller, cs);
414 /* Obtains an address to use for the local sFlow agent and stores it into
415 * '*agent_addr'. Returns true if successful, false on failure.
417 * The sFlow agent address should be a local IP address that is persistent and
418 * reachable over the network, if possible. The IP address associated with
419 * 'agent_device' is used if it has one, and otherwise 'control_ip', the IP
420 * address used to talk to the controller. If the agent device is not
421 * specified then it is figured out by taking a look at the routing table based
424 sflow_choose_agent_address(const char *agent_device,
425 const struct sset *targets,
426 const char *control_ip,
427 SFLAddress *agent_addr)
432 memset(agent_addr, 0, sizeof *agent_addr);
433 agent_addr->type = SFLADDRESSTYPE_IP_V4;
436 if (!netdev_get_in4_by_name(agent_device, &in4)) {
441 SSET_FOR_EACH (target, targets) {
443 struct sockaddr_storage ss;
444 struct sockaddr_in sin;
448 if (inet_parse_active(target, SFL_DEFAULT_COLLECTOR_PORT, &sa.ss)
449 && sa.ss.ss_family == AF_INET) {
450 struct in6_addr addr6, src, gw;
452 in6_addr_set_mapped_ipv4(&addr6, sa.sin.sin_addr.s_addr);
453 if (ovs_router_lookup(&addr6, name, &src, &gw)) {
455 in4.s_addr = in6_addr_get_mapped_ipv4(&src);
461 if (control_ip && !lookup_ip(control_ip, &in4)) {
465 VLOG_ERR("could not determine IP address for sFlow agent");
469 agent_addr->address.ip_v4.addr = (OVS_FORCE uint32_t) in4.s_addr;
474 dpif_sflow_clear__(struct dpif_sflow *ds) OVS_REQUIRES(mutex)
476 if (ds->sflow_agent) {
477 sflow_global_counters_subid_clear(ds->sflow_agent->subId);
478 sfl_agent_release(ds->sflow_agent);
479 free(ds->sflow_agent);
480 ds->sflow_agent = NULL;
482 collectors_destroy(ds->collectors);
483 ds->collectors = NULL;
484 ofproto_sflow_options_destroy(ds->options);
487 /* Turn off sampling to save CPU cycles. */
492 dpif_sflow_clear(struct dpif_sflow *ds) OVS_EXCLUDED(mutex)
494 ovs_mutex_lock(&mutex);
495 dpif_sflow_clear__(ds);
496 ovs_mutex_unlock(&mutex);
500 dpif_sflow_is_enabled(const struct dpif_sflow *ds) OVS_EXCLUDED(mutex)
504 ovs_mutex_lock(&mutex);
505 enabled = ds->collectors != NULL;
506 ovs_mutex_unlock(&mutex);
511 dpif_sflow_create(void)
513 static struct ovsthread_once once = OVSTHREAD_ONCE_INITIALIZER;
514 struct dpif_sflow *ds;
516 if (ovsthread_once_start(&once)) {
517 ovs_mutex_init_recursive(&mutex);
518 ovsthread_once_done(&once);
521 ds = xcalloc(1, sizeof *ds);
522 ds->next_tick = time_now() + 1;
523 hmap_init(&ds->ports);
525 ovs_refcount_init(&ds->ref_cnt);
531 dpif_sflow_ref(const struct dpif_sflow *ds_)
533 struct dpif_sflow *ds = CONST_CAST(struct dpif_sflow *, ds_);
535 ovs_refcount_ref(&ds->ref_cnt);
540 /* 32-bit fraction of packets to sample with. A value of 0 samples no packets,
541 * a value of %UINT32_MAX samples all packets and intermediate values sample
542 * intermediate fractions of packets. */
544 dpif_sflow_get_probability(const struct dpif_sflow *ds) OVS_EXCLUDED(mutex)
546 uint32_t probability;
547 ovs_mutex_lock(&mutex);
548 probability = ds->probability;
549 ovs_mutex_unlock(&mutex);
554 dpif_sflow_unref(struct dpif_sflow *ds) OVS_EXCLUDED(mutex)
556 if (ds && ovs_refcount_unref_relaxed(&ds->ref_cnt) == 1) {
557 struct dpif_sflow_port *dsp, *next;
559 dpif_sflow_clear(ds);
560 HMAP_FOR_EACH_SAFE (dsp, next, hmap_node, &ds->ports) {
561 dpif_sflow_del_port__(ds, dsp);
563 hmap_destroy(&ds->ports);
569 dpif_sflow_add_poller(struct dpif_sflow *ds, struct dpif_sflow_port *dsp)
572 SFLPoller *poller = sfl_agent_addPoller(ds->sflow_agent, &dsp->dsi, ds,
573 sflow_agent_get_counters);
574 sfl_poller_set_sFlowCpInterval(poller, ds->options->polling_interval);
575 sfl_poller_set_sFlowCpReceiver(poller, RECEIVER_INDEX);
576 sfl_poller_set_bridgePort(poller, odp_to_u32(dsp->odp_port));
579 static enum dpif_sflow_tunnel_type
580 dpif_sflow_tunnel_type(struct ofport *ofport) {
581 const char *type = netdev_get_type(ofport->netdev);
583 if (strcmp(type, "gre") == 0) {
584 return DPIF_SFLOW_TUNNEL_GRE;
585 } else if (strcmp(type, "ipsec_gre") == 0) {
586 return DPIF_SFLOW_TUNNEL_IPSEC_GRE;
587 } else if (strcmp(type, "vxlan") == 0) {
588 return DPIF_SFLOW_TUNNEL_VXLAN;
589 } else if (strcmp(type, "lisp") == 0) {
590 return DPIF_SFLOW_TUNNEL_LISP;
591 } else if (strcmp(type, "geneve") == 0) {
592 return DPIF_SFLOW_TUNNEL_GENEVE;
595 return DPIF_SFLOW_TUNNEL_UNKNOWN;
599 dpif_sflow_tunnel_proto(enum dpif_sflow_tunnel_type tunnel_type)
601 /* Default to 0 (IPPROTO_IP), meaning "unknown". */
603 switch(tunnel_type) {
605 case DPIF_SFLOW_TUNNEL_GRE:
606 ipproto = IPPROTO_GRE;
609 case DPIF_SFLOW_TUNNEL_IPSEC_GRE:
610 ipproto = IPPROTO_ESP;
613 case DPIF_SFLOW_TUNNEL_VXLAN:
614 case DPIF_SFLOW_TUNNEL_LISP:
615 case DPIF_SFLOW_TUNNEL_GENEVE:
616 ipproto = IPPROTO_UDP;
618 case DPIF_SFLOW_TUNNEL_UNKNOWN:
625 dpif_sflow_add_port(struct dpif_sflow *ds, struct ofport *ofport,
626 odp_port_t odp_port) OVS_EXCLUDED(mutex)
628 struct dpif_sflow_port *dsp;
630 enum dpif_sflow_tunnel_type tunnel_type;
632 ovs_mutex_lock(&mutex);
633 dpif_sflow_del_port(ds, odp_port);
635 tunnel_type = dpif_sflow_tunnel_type(ofport);
636 ifindex = netdev_get_ifindex(ofport->netdev);
639 && tunnel_type == DPIF_SFLOW_TUNNEL_UNKNOWN) {
640 /* Not an ifindex port, and not a tunnel port either
641 * so do not add a cross-reference to it here.
646 /* Add to table of ports. */
647 dsp = xmalloc(sizeof *dsp);
648 dsp->ofport = ofport;
649 dsp->odp_port = odp_port;
650 dsp->tunnel_type = tunnel_type;
651 hmap_insert(&ds->ports, &dsp->hmap_node, hash_odp_port(odp_port));
654 /* Add poller for ports that have ifindex. */
655 SFL_DS_SET(dsp->dsi, SFL_DSCLASS_IFINDEX, ifindex, 0);
656 if (ds->sflow_agent) {
657 dpif_sflow_add_poller(ds, dsp);
660 /* Record "ifindex unknown" for the others */
661 SFL_DS_SET(dsp->dsi, SFL_DSCLASS_IFINDEX, 0, 0);
665 ovs_mutex_unlock(&mutex);
669 dpif_sflow_del_port__(struct dpif_sflow *ds, struct dpif_sflow_port *dsp)
673 && SFL_DS_INDEX(dsp->dsi)) {
674 sfl_agent_removePoller(ds->sflow_agent, &dsp->dsi);
675 sfl_agent_removeSampler(ds->sflow_agent, &dsp->dsi);
677 hmap_remove(&ds->ports, &dsp->hmap_node);
682 dpif_sflow_del_port(struct dpif_sflow *ds, odp_port_t odp_port)
685 struct dpif_sflow_port *dsp;
687 ovs_mutex_lock(&mutex);
688 dsp = dpif_sflow_find_port(ds, odp_port);
690 dpif_sflow_del_port__(ds, dsp);
692 ovs_mutex_unlock(&mutex);
696 dpif_sflow_set_options(struct dpif_sflow *ds,
697 const struct ofproto_sflow_options *options)
700 struct dpif_sflow_port *dsp;
701 bool options_changed;
702 SFLReceiver *receiver;
705 SFLDataSource_instance dsi;
710 ovs_mutex_lock(&mutex);
711 if (sset_is_empty(&options->targets) || !options->sampling_rate) {
712 /* No point in doing any work if there are no targets or nothing to
714 dpif_sflow_clear__(ds);
718 options_changed = (!ds->options
719 || !ofproto_sflow_options_equal(options, ds->options));
721 /* Configure collectors if options have changed or if we're shortchanged in
722 * collectors (which indicates that opening one or more of the configured
723 * collectors failed, so that we should retry). */
725 || collectors_count(ds->collectors) < sset_count(&options->targets)) {
726 collectors_destroy(ds->collectors);
727 collectors_create(&options->targets, SFL_DEFAULT_COLLECTOR_PORT,
729 if (ds->collectors == NULL) {
730 VLOG_WARN_RL(&rl, "no collectors could be initialized, "
732 dpif_sflow_clear__(ds);
737 /* Choose agent IP address and agent device (if not yet setup) */
738 if (!sflow_choose_agent_address(options->agent_device,
740 options->control_ip, &agentIP)) {
741 dpif_sflow_clear__(ds);
745 /* Avoid reconfiguring if options didn't change. */
746 if (!options_changed) {
749 ofproto_sflow_options_destroy(ds->options);
750 ds->options = ofproto_sflow_options_clone(options);
753 VLOG_INFO("creating sFlow agent %d", options->sub_id);
754 if (ds->sflow_agent) {
755 sflow_global_counters_subid_clear(ds->sflow_agent->subId);
756 sfl_agent_release(ds->sflow_agent);
758 ds->sflow_agent = xcalloc(1, sizeof *ds->sflow_agent);
760 sfl_agent_init(ds->sflow_agent,
763 now, /* Boot time. */
764 now, /* Current time. */
765 ds, /* Pointer supplied to callbacks. */
766 sflow_agent_alloc_cb,
768 sflow_agent_error_cb,
769 sflow_agent_send_packet_cb);
771 receiver = sfl_agent_addReceiver(ds->sflow_agent);
772 sfl_receiver_set_sFlowRcvrOwner(receiver, "Open vSwitch sFlow");
773 sfl_receiver_set_sFlowRcvrTimeout(receiver, 0xffffffff);
775 /* Set the sampling_rate down in the datapath. */
776 ds->probability = MAX(1, UINT32_MAX / ds->options->sampling_rate);
778 /* Add a single sampler for the bridge. This appears as a PHYSICAL_ENTITY
779 because it is associated with the hypervisor, and interacts with the server
780 hardware directly. The sub_id is used to distinguish this sampler from
781 others on other bridges within the same agent. */
782 dsIndex = 1000 + options->sub_id;
783 SFL_DS_SET(dsi, SFL_DSCLASS_PHYSICAL_ENTITY, dsIndex, 0);
784 sampler = sfl_agent_addSampler(ds->sflow_agent, &dsi);
785 sfl_sampler_set_sFlowFsPacketSamplingRate(sampler, ds->options->sampling_rate);
786 sfl_sampler_set_sFlowFsMaximumHeaderSize(sampler, ds->options->header_len);
787 sfl_sampler_set_sFlowFsReceiver(sampler, RECEIVER_INDEX);
789 /* Add a counter poller for the bridge so we can use it to send
790 global counters such as datapath cache hit/miss stats. */
791 poller = sfl_agent_addPoller(ds->sflow_agent, &dsi, ds,
792 sflow_agent_get_global_counters);
793 sfl_poller_set_sFlowCpInterval(poller, ds->options->polling_interval);
794 sfl_poller_set_sFlowCpReceiver(poller, RECEIVER_INDEX);
796 /* Add pollers for the currently known ifindex-ports */
797 HMAP_FOR_EACH (dsp, hmap_node, &ds->ports) {
798 if (SFL_DS_INDEX(dsp->dsi)) {
799 dpif_sflow_add_poller(ds, dsp);
805 ovs_mutex_unlock(&mutex);
809 dpif_sflow_odp_port_to_ifindex(const struct dpif_sflow *ds,
810 odp_port_t odp_port) OVS_EXCLUDED(mutex)
812 struct dpif_sflow_port *dsp;
815 ovs_mutex_lock(&mutex);
816 dsp = dpif_sflow_find_port(ds, odp_port);
817 ret = dsp ? SFL_DS_INDEX(dsp->dsi) : 0;
818 ovs_mutex_unlock(&mutex);
823 dpif_sflow_tunnel_v4(uint8_t tunnel_ipproto,
824 const struct flow_tnl *tunnel,
825 SFLSampled_ipv4 *ipv4)
828 ipv4->protocol = tunnel_ipproto;
829 ipv4->tos = tunnel->ip_tos;
830 ipv4->src_ip.addr = (OVS_FORCE uint32_t) tunnel->ip_src;
831 ipv4->dst_ip.addr = (OVS_FORCE uint32_t) tunnel->ip_dst;
832 ipv4->src_port = (OVS_FORCE uint16_t) tunnel->tp_src;
833 ipv4->dst_port = (OVS_FORCE uint16_t) tunnel->tp_dst;
837 dpif_sflow_push_mpls_lse(struct dpif_sflow_actions *sflow_actions,
840 if (sflow_actions->mpls_stack_depth >= FLOW_MAX_MPLS_LABELS) {
841 sflow_actions->mpls_err = true;
845 /* Record the new lse in host-byte-order. */
846 /* BOS flag will be fixed later when we send stack to sFlow library. */
847 sflow_actions->mpls_lse[sflow_actions->mpls_stack_depth++] = ntohl(lse);
851 dpif_sflow_pop_mpls_lse(struct dpif_sflow_actions *sflow_actions)
853 if (sflow_actions->mpls_stack_depth == 0) {
854 sflow_actions->mpls_err = true;
857 sflow_actions->mpls_stack_depth--;
861 dpif_sflow_set_mpls(struct dpif_sflow_actions *sflow_actions,
862 const struct ovs_key_mpls *mpls_key, int n)
865 if (n > FLOW_MAX_MPLS_LABELS) {
866 sflow_actions->mpls_err = true;
870 for (ii = 0; ii < n; ii++) {
871 /* Reverse stack order, and use host-byte-order for each lse. */
872 sflow_actions->mpls_lse[n - ii - 1] = ntohl(mpls_key[ii].mpls_lse);
874 sflow_actions->mpls_stack_depth = n;
878 sflow_read_tnl_push_action(const struct nlattr *attr,
879 struct dpif_sflow_actions *sflow_actions)
881 /* Modeled on lib/odp-util.c: format_odp_tnl_push_header */
882 const struct ovs_action_push_tnl *data = nl_attr_get(attr);
883 const struct eth_header *eth = (const struct eth_header *) data->header;
884 const struct ip_header *ip
885 = ALIGNED_CAST(const struct ip_header *, eth + 1);
887 sflow_actions->out_port = u32_to_odp(data->out_port);
890 /* TODO: SFlow does not currently define a MAC-in-MAC
891 * encapsulation structure. We could use an extension
892 * structure to report this.
896 /* Cannot assume alignment so just use memcpy. */
897 sflow_actions->tunnel.ip_src = get_16aligned_be32(&ip->ip_src);
898 sflow_actions->tunnel.ip_dst = get_16aligned_be32(&ip->ip_dst);
899 sflow_actions->tunnel.ip_tos = ip->ip_tos;
900 sflow_actions->tunnel.ip_ttl = ip->ip_ttl;
901 /* The tnl_push action can supply the ip_protocol too. */
902 sflow_actions->tunnel_ipproto = ip->ip_proto;
905 if (data->tnl_type == OVS_VPORT_TYPE_VXLAN
906 || data->tnl_type == OVS_VPORT_TYPE_GENEVE) {
907 const struct udp_header *udp = (const struct udp_header *) (ip + 1);
908 sflow_actions->tunnel.tp_src = udp->udp_src;
909 sflow_actions->tunnel.tp_dst = udp->udp_dst;
911 if (data->tnl_type == OVS_VPORT_TYPE_VXLAN) {
912 const struct vxlanhdr *vxh = (const struct vxlanhdr *) (udp + 1);
913 uint64_t tun_id = ntohl(get_16aligned_be32(&vxh->vx_vni)) >> 8;
914 sflow_actions->tunnel.tun_id = htonll(tun_id);
916 const struct genevehdr *gnh = (const struct genevehdr *) (udp + 1);
917 uint64_t tun_id = ntohl(get_16aligned_be32(&gnh->vni)) >> 8;
918 sflow_actions->tunnel.tun_id = htonll(tun_id);
920 } else if (data->tnl_type == OVS_VPORT_TYPE_GRE) {
921 const void *l4 = ip + 1;
922 const struct gre_base_hdr *greh = (const struct gre_base_hdr *) l4;
923 ovs_16aligned_be32 *options = (ovs_16aligned_be32 *)(greh + 1);
924 if (greh->flags & htons(GRE_CSUM)) {
927 if (greh->flags & htons(GRE_KEY)) {
928 uint64_t tun_id = ntohl(get_16aligned_be32(options));
929 sflow_actions->tunnel.tun_id = htonll(tun_id);
935 sflow_read_set_action(const struct nlattr *attr,
936 struct dpif_sflow_actions *sflow_actions)
938 enum ovs_key_attr type = nl_attr_type(attr);
940 case OVS_KEY_ATTR_ENCAP:
941 if (++sflow_actions->encap_depth > 1) {
942 /* Do not handle multi-encap for now. */
943 sflow_actions->tunnel_err = true;
945 dpif_sflow_read_actions(NULL,
946 nl_attr_get(attr), nl_attr_get_size(attr),
950 case OVS_KEY_ATTR_PRIORITY:
951 case OVS_KEY_ATTR_SKB_MARK:
952 case OVS_KEY_ATTR_DP_HASH:
953 case OVS_KEY_ATTR_RECIRC_ID:
956 case OVS_KEY_ATTR_TUNNEL: {
957 if (++sflow_actions->encap_depth > 1) {
958 /* Do not handle multi-encap for now. */
959 sflow_actions->tunnel_err = true;
961 if (odp_tun_key_from_attr(attr, false, &sflow_actions->tunnel)
963 /* Tunnel parsing error. */
964 sflow_actions->tunnel_err = true;
970 case OVS_KEY_ATTR_IN_PORT:
971 case OVS_KEY_ATTR_ETHERNET:
972 case OVS_KEY_ATTR_VLAN:
975 case OVS_KEY_ATTR_MPLS: {
976 const struct ovs_key_mpls *mpls_key = nl_attr_get(attr);
977 size_t size = nl_attr_get_size(attr);
978 dpif_sflow_set_mpls(sflow_actions, mpls_key, size / sizeof *mpls_key);
982 case OVS_KEY_ATTR_ETHERTYPE:
983 case OVS_KEY_ATTR_IPV4:
984 if (sflow_actions->encap_depth == 1) {
985 const struct ovs_key_ipv4 *key = nl_attr_get(attr);
987 sflow_actions->tunnel.ip_src = key->ipv4_src;
990 sflow_actions->tunnel.ip_dst = key->ipv4_dst;
992 if (key->ipv4_proto) {
993 sflow_actions->tunnel_ipproto = key->ipv4_proto;
996 sflow_actions->tunnel.ip_tos = key->ipv4_tos;
999 sflow_actions->tunnel.ip_tos = key->ipv4_ttl;
1004 case OVS_KEY_ATTR_IPV6:
1005 /* TODO: parse IPv6 encap. */
1008 /* These have the same structure and format. */
1009 case OVS_KEY_ATTR_TCP:
1010 case OVS_KEY_ATTR_UDP:
1011 case OVS_KEY_ATTR_SCTP:
1012 if (sflow_actions->encap_depth == 1) {
1013 const struct ovs_key_tcp *key = nl_attr_get(attr);
1015 sflow_actions->tunnel.tp_src = key->tcp_src;
1018 sflow_actions->tunnel.tp_dst = key->tcp_dst;
1023 case OVS_KEY_ATTR_TCP_FLAGS:
1024 case OVS_KEY_ATTR_ICMP:
1025 case OVS_KEY_ATTR_ICMPV6:
1026 case OVS_KEY_ATTR_ARP:
1027 case OVS_KEY_ATTR_ND:
1028 case OVS_KEY_ATTR_CT_STATE:
1029 case OVS_KEY_ATTR_CT_ZONE:
1030 case OVS_KEY_ATTR_CT_MARK:
1031 case OVS_KEY_ATTR_CT_LABELS:
1032 case OVS_KEY_ATTR_UNSPEC:
1033 case __OVS_KEY_ATTR_MAX:
1040 dpif_sflow_capture_input_mpls(const struct flow *flow,
1041 struct dpif_sflow_actions *sflow_actions)
1043 if (eth_type_mpls(flow->dl_type)) {
1047 /* Calculate depth by detecting BOS. */
1048 for (ii = 0; ii < FLOW_MAX_MPLS_LABELS; ii++) {
1049 lse = flow->mpls_lse[ii];
1051 if (lse & htonl(MPLS_BOS_MASK)) {
1055 /* Capture stack, reversing stack order, and
1056 * using host-byte-order for each lse. BOS flag
1057 * is ignored for now. It is set later when
1058 * the output stack is encoded.
1060 for (ii = 0; ii < depth; ii++) {
1061 lse = flow->mpls_lse[ii];
1062 sflow_actions->mpls_lse[depth - ii - 1] = ntohl(lse);
1064 sflow_actions->mpls_stack_depth = depth;
1069 dpif_sflow_read_actions(const struct flow *flow,
1070 const struct nlattr *actions, size_t actions_len,
1071 struct dpif_sflow_actions *sflow_actions)
1073 const struct nlattr *a;
1076 if (actions_len == 0) {
1077 /* Packet dropped.*/
1082 /* Make sure the MPLS output stack
1083 * is seeded with the input stack.
1085 dpif_sflow_capture_input_mpls(flow, sflow_actions);
1087 /* XXX when 802.1AD(QinQ) is supported then
1088 * we can do the same with VLAN stacks here
1092 NL_ATTR_FOR_EACH (a, left, actions, actions_len) {
1093 enum ovs_action_attr type = nl_attr_type(a);
1095 case OVS_ACTION_ATTR_OUTPUT:
1096 /* Capture the output port in case we need it
1097 * to get the output tunnel type.
1099 sflow_actions->out_port = u32_to_odp(nl_attr_get_u32(a));
1102 case OVS_ACTION_ATTR_TUNNEL_POP:
1103 /* XXX: Do not handle this for now. It's not clear
1104 * if we should start with encap_depth == 1 when we
1105 * see an input tunnel, or if we should assume
1106 * that the input tunnel was always "popped" if it
1107 * was presented to us decoded in flow->tunnel?
1109 * If we do handle this it might look like this,
1110 * as we clear the captured tunnel info and decrement
1113 * memset(&sflow_actions->tunnel, 0, sizeof struct flow_tnl);
1114 * sflow_actions->tunnel_ipproto = 0;
1115 * --sflow_actions->encap_depth;
1117 * but for now just disable the tunnel annotation:
1119 sflow_actions->tunnel_err = true;
1122 case OVS_ACTION_ATTR_TUNNEL_PUSH:
1123 /* XXX: This actions appears to come with it's own
1124 * OUTPUT action, so should it be regarded as having
1125 * an implicit "pop" following it too? Put another
1126 * way, would two tnl_push() actions in succession
1127 * result in a packet with two layers of encap?
1129 if (++sflow_actions->encap_depth > 1) {
1130 /* Do not handle multi-encap for now. */
1131 sflow_actions->tunnel_err = true;
1133 sflow_read_tnl_push_action(a, sflow_actions);
1137 case OVS_ACTION_ATTR_TRUNC:
1138 case OVS_ACTION_ATTR_USERSPACE:
1139 case OVS_ACTION_ATTR_RECIRC:
1140 case OVS_ACTION_ATTR_HASH:
1141 case OVS_ACTION_ATTR_CT:
1144 case OVS_ACTION_ATTR_SET_MASKED:
1145 /* TODO: apply mask. XXX: Are we likely to see this? */
1148 case OVS_ACTION_ATTR_SET:
1149 sflow_read_set_action(nl_attr_get(a), sflow_actions);
1152 case OVS_ACTION_ATTR_PUSH_VLAN:
1153 case OVS_ACTION_ATTR_POP_VLAN:
1154 /* TODO: 802.1AD(QinQ) is not supported by OVS (yet), so do not
1155 * construct a VLAN-stack. The sFlow user-action cookie already
1156 * captures the egress VLAN ID so there is nothing more to do here.
1160 case OVS_ACTION_ATTR_PUSH_MPLS: {
1161 const struct ovs_action_push_mpls *mpls = nl_attr_get(a);
1163 dpif_sflow_push_mpls_lse(sflow_actions, mpls->mpls_lse);
1167 case OVS_ACTION_ATTR_POP_MPLS: {
1168 dpif_sflow_pop_mpls_lse(sflow_actions);
1171 case OVS_ACTION_ATTR_SAMPLE:
1172 case OVS_ACTION_ATTR_UNSPEC:
1173 case __OVS_ACTION_ATTR_MAX:
1181 dpif_sflow_encode_mpls_stack(SFLLabelStack *stack,
1182 uint32_t *mpls_lse_buf,
1183 const struct dpif_sflow_actions *sflow_actions)
1185 /* Put the MPLS stack back into "packet header" order,
1186 * and make sure the BOS flag is set correctly on the last
1187 * one. Each lse is still in host-byte-order.
1191 stack->depth = sflow_actions->mpls_stack_depth;
1192 stack->stack = mpls_lse_buf;
1193 for (ii = 0; ii < stack->depth; ii++) {
1194 lse = sflow_actions->mpls_lse[stack->depth - ii - 1];
1195 stack->stack[ii] = (lse & ~MPLS_BOS_MASK);
1197 stack->stack[stack->depth - 1] |= MPLS_BOS_MASK;
1200 /* Extract the output port count from the user action cookie.
1201 * See http://sflow.org/sflow_version_5.txt "Input/Output port information"
1204 dpif_sflow_cookie_num_outputs(const union user_action_cookie *cookie)
1206 uint32_t format = cookie->sflow.output & 0xC0000000;
1207 uint32_t port_n = cookie->sflow.output & 0x3FFFFFFF;
1209 return port_n ? 1 : 0;
1211 else if (format == 0x80000000) {
1218 dpif_sflow_received(struct dpif_sflow *ds, const struct dp_packet *packet,
1219 const struct flow *flow, odp_port_t odp_in_port,
1220 const union user_action_cookie *cookie,
1221 const struct dpif_sflow_actions *sflow_actions)
1224 SFL_FLOW_SAMPLE_TYPE fs;
1225 SFLFlow_sample_element hdrElem;
1226 SFLSampled_header *header;
1227 SFLFlow_sample_element switchElem;
1228 uint8_t tnlInProto, tnlOutProto;
1229 SFLFlow_sample_element tnlInElem, tnlOutElem;
1230 SFLFlow_sample_element vniInElem, vniOutElem;
1231 SFLFlow_sample_element mplsElem;
1232 uint32_t mpls_lse_buf[FLOW_MAX_MPLS_LABELS];
1233 SFLSampler *sampler;
1234 struct dpif_sflow_port *in_dsp;
1235 struct dpif_sflow_port *out_dsp;
1238 ovs_mutex_lock(&mutex);
1239 sampler = ds->sflow_agent->samplers;
1244 /* Build a flow sample. */
1245 memset(&fs, 0, sizeof fs);
1247 /* Look up the input ifIndex if this port has one. Otherwise just
1248 * leave it as 0 (meaning 'unknown') and continue. */
1249 in_dsp = dpif_sflow_find_port(ds, odp_in_port);
1251 fs.input = SFL_DS_INDEX(in_dsp->dsi);
1254 /* Make the assumption that the random number generator in the datapath converges
1255 * to the configured mean, and just increment the samplePool by the configured
1256 * sampling rate every time. */
1257 sampler->samplePool += sfl_sampler_get_sFlowFsPacketSamplingRate(sampler);
1259 /* Sampled header. */
1260 memset(&hdrElem, 0, sizeof hdrElem);
1261 hdrElem.tag = SFLFLOW_HEADER;
1262 header = &hdrElem.flowType.header;
1263 header->header_protocol = SFLHEADER_ETHERNET_ISO8023;
1264 /* The frame_length should include the Ethernet FCS (4 bytes),
1265 * but it has already been stripped, so we need to add 4 here. */
1266 header->frame_length = dp_packet_size(packet) + 4;
1267 /* Ethernet FCS stripped off. */
1268 header->stripped = 4;
1269 header->header_length = MIN(dp_packet_size(packet),
1270 sampler->sFlowFsMaximumHeaderSize);
1271 header->header_bytes = dp_packet_data(packet);
1273 /* Add extended switch element. */
1274 memset(&switchElem, 0, sizeof(switchElem));
1275 switchElem.tag = SFLFLOW_EX_SWITCH;
1276 switchElem.flowType.sw.src_vlan = vlan_tci_to_vid(flow->vlan_tci);
1277 switchElem.flowType.sw.src_priority = vlan_tci_to_pcp(flow->vlan_tci);
1279 /* Retrieve data from user_action_cookie. */
1280 vlan_tci = cookie->sflow.vlan_tci;
1281 switchElem.flowType.sw.dst_vlan = vlan_tci_to_vid(vlan_tci);
1282 switchElem.flowType.sw.dst_priority = vlan_tci_to_pcp(vlan_tci);
1284 fs.output = cookie->sflow.output;
1287 if (flow->tunnel.ip_dst) {
1288 memset(&tnlInElem, 0, sizeof(tnlInElem));
1289 tnlInElem.tag = SFLFLOW_EX_IPV4_TUNNEL_INGRESS;
1290 tnlInProto = dpif_sflow_tunnel_proto(in_dsp->tunnel_type);
1291 dpif_sflow_tunnel_v4(tnlInProto,
1293 &tnlInElem.flowType.ipv4);
1294 SFLADD_ELEMENT(&fs, &tnlInElem);
1295 if (flow->tunnel.tun_id) {
1296 memset(&vniInElem, 0, sizeof(vniInElem));
1297 vniInElem.tag = SFLFLOW_EX_VNI_INGRESS;
1298 vniInElem.flowType.tunnel_vni.vni
1299 = ntohll(flow->tunnel.tun_id);
1300 SFLADD_ELEMENT(&fs, &vniInElem);
1304 /* Output tunnel. */
1306 && sflow_actions->encap_depth == 1
1307 && !sflow_actions->tunnel_err
1308 && dpif_sflow_cookie_num_outputs(cookie) == 1) {
1309 tnlOutProto = sflow_actions->tunnel_ipproto;
1310 if (tnlOutProto == 0) {
1311 /* Try to infer the ip-protocol from the output port. */
1312 if (sflow_actions->out_port != ODPP_NONE) {
1313 out_dsp = dpif_sflow_find_port(ds, sflow_actions->out_port);
1315 tnlOutProto = dpif_sflow_tunnel_proto(out_dsp->tunnel_type);
1319 memset(&tnlOutElem, 0, sizeof(tnlOutElem));
1320 tnlOutElem.tag = SFLFLOW_EX_IPV4_TUNNEL_EGRESS;
1321 dpif_sflow_tunnel_v4(tnlOutProto,
1322 &sflow_actions->tunnel,
1323 &tnlOutElem.flowType.ipv4);
1324 SFLADD_ELEMENT(&fs, &tnlOutElem);
1325 if (sflow_actions->tunnel.tun_id) {
1326 memset(&vniOutElem, 0, sizeof(vniOutElem));
1327 vniOutElem.tag = SFLFLOW_EX_VNI_EGRESS;
1328 vniOutElem.flowType.tunnel_vni.vni
1329 = ntohll(sflow_actions->tunnel.tun_id);
1330 SFLADD_ELEMENT(&fs, &vniOutElem);
1334 /* MPLS output label stack. */
1336 && sflow_actions->mpls_stack_depth > 0
1337 && !sflow_actions->mpls_err
1338 && dpif_sflow_cookie_num_outputs(cookie) == 1) {
1339 memset(&mplsElem, 0, sizeof(mplsElem));
1340 mplsElem.tag = SFLFLOW_EX_MPLS;
1341 dpif_sflow_encode_mpls_stack(&mplsElem.flowType.mpls.out_stack,
1344 SFLADD_ELEMENT(&fs, &mplsElem);
1347 /* Submit the flow sample to be encoded into the next datagram. */
1348 SFLADD_ELEMENT(&fs, &hdrElem);
1349 SFLADD_ELEMENT(&fs, &switchElem);
1350 sfl_sampler_writeFlowSample(sampler, &fs);
1353 ovs_mutex_unlock(&mutex);
1357 dpif_sflow_run(struct dpif_sflow *ds) OVS_EXCLUDED(mutex)
1359 ovs_mutex_lock(&mutex);
1360 if (ds->collectors != NULL) {
1361 time_t now = time_now();
1363 if (now >= ds->next_tick) {
1364 sfl_agent_tick(ds->sflow_agent, time_wall());
1365 ds->next_tick = now + 1;
1368 ovs_mutex_unlock(&mutex);
1372 dpif_sflow_wait(struct dpif_sflow *ds) OVS_EXCLUDED(mutex)
1374 ovs_mutex_lock(&mutex);
1375 if (ds->collectors != NULL) {
1376 poll_timer_wait_until(ds->next_tick * 1000LL);
1378 ovs_mutex_unlock(&mutex);