2 * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014 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.
27 #include "ofp-actions.h"
29 #include "ofproto/ofproto-provider.h"
30 #include "ofproto/ofproto-dpif.h"
31 #include "connectivity.h"
33 #include "dynamic-string.h"
42 #include "poll-loop.h"
50 VLOG_DEFINE_THIS_MODULE(bond);
52 static struct ovs_rwlock rwlock = OVS_RWLOCK_INITIALIZER;
53 static struct hmap all_bonds__ = HMAP_INITIALIZER(&all_bonds__);
54 static struct hmap *const all_bonds OVS_GUARDED_BY(rwlock) = &all_bonds__;
56 /* Bit-mask for hashing a flow down to a bucket. */
57 #define BOND_MASK 0xff
58 #define BOND_BUCKETS (BOND_MASK + 1)
59 #define RECIRC_RULE_PRIORITY 20 /* Priority level for internal rules */
61 /* A hash bucket for mapping a flow to a slave.
62 * "struct bond" has an array of BOND_BUCKETS of these. */
64 struct bond_slave *slave; /* Assigned slave, NULL if unassigned. */
65 uint64_t tx_bytes /* Count of bytes recently transmitted. */
66 OVS_GUARDED_BY(rwlock);
67 struct list list_node; /* In bond_slave's 'entries' list. */
71 * 'pr_rule' is the post-recirculation rule for this entry.
72 * 'pr_tx_bytes' is the most recently seen statistics for 'pr_rule', which
73 * is used to determine delta (applied to 'tx_bytes' above.) */
75 uint64_t pr_tx_bytes OVS_GUARDED_BY(rwlock);
78 /* A bond slave, that is, one of the links comprising a bond. */
80 struct hmap_node hmap_node; /* In struct bond's slaves hmap. */
81 struct list list_node; /* In struct bond's enabled_slaves list. */
82 struct bond *bond; /* The bond that contains this slave. */
83 void *aux; /* Client-provided handle for this slave. */
85 struct netdev *netdev; /* Network device, owned by the client. */
86 unsigned int change_seq; /* Tracks changes in 'netdev'. */
87 ofp_port_t ofp_port; /* Open flow port number */
88 char *name; /* Name (a copy of netdev_get_name(netdev)). */
91 long long delay_expires; /* Time after which 'enabled' may change. */
92 bool enabled; /* May be chosen for flows? */
93 bool may_enable; /* Client considers this slave bondable. */
95 /* Rebalancing info. Used only by bond_rebalance(). */
96 struct list bal_node; /* In bond_rebalance()'s 'bals' list. */
97 struct list entries; /* 'struct bond_entry's assigned here. */
98 uint64_t tx_bytes; /* Sum across 'tx_bytes' of entries. */
101 /* A bond, that is, a set of network devices grouped to improve performance or
104 struct hmap_node hmap_node; /* In 'all_bonds' hmap. */
105 char *name; /* Name provided by client. */
106 struct ofproto_dpif *ofproto; /* The bridge this bond belongs to. */
113 * Any reader or writer of 'enabled_slaves' must hold 'mutex'.
114 * (To prevent the bond_slave from disappearing they must also hold
116 struct ovs_mutex mutex OVS_ACQ_AFTER(rwlock);
117 struct list enabled_slaves OVS_GUARDED; /* Contains struct bond_slaves. */
120 enum bond_mode balance; /* Balancing mode, one of BM_*. */
121 struct bond_slave *active_slave;
122 int updelay, downdelay; /* Delay before slave goes up/down, in ms. */
123 enum lacp_status lacp_status; /* Status of LACP negotiations. */
124 bool bond_revalidate; /* True if flows need revalidation. */
125 uint32_t basis; /* Basis for flow hash function. */
127 /* SLB specific bonding info. */
128 struct bond_entry *hash; /* An array of BOND_BUCKETS elements. */
129 int rebalance_interval; /* Interval between rebalances, in ms. */
130 long long int next_rebalance; /* Next rebalancing time. */
131 bool send_learning_packets;
132 uint32_t recirc_id; /* Non zero if recirculation can be used.*/
133 struct hmap pr_rule_ops; /* Helps to maintain post recirculation rules.*/
135 /* Legacy compatibility. */
136 long long int next_fake_iface_update; /* LLONG_MAX if disabled. */
137 bool lacp_fallback_ab; /* Fallback to active-backup on LACP failure. */
139 struct ovs_refcount ref_cnt;
142 /* What to do with an bond_recirc_rule. */
144 ADD, /* Add the rule to ofproto's flow table. */
145 DEL, /* Delete the rule from the ofproto's flow table. */
148 /* A rule to add to or delete from ofproto's internal flow table. */
149 struct bond_pr_rule_op {
150 struct hmap_node hmap_node;
152 ofp_port_t out_ofport;
154 struct rule **pr_rule;
157 static void bond_entry_reset(struct bond *) OVS_REQ_WRLOCK(rwlock);
158 static struct bond_slave *bond_slave_lookup(struct bond *, const void *slave_)
159 OVS_REQ_RDLOCK(rwlock);
160 static void bond_enable_slave(struct bond_slave *, bool enable)
161 OVS_REQ_WRLOCK(rwlock);
162 static void bond_link_status_update(struct bond_slave *)
163 OVS_REQ_WRLOCK(rwlock);
164 static void bond_choose_active_slave(struct bond *)
165 OVS_REQ_WRLOCK(rwlock);
166 static unsigned int bond_hash_src(const uint8_t mac[ETH_ADDR_LEN],
167 uint16_t vlan, uint32_t basis);
168 static unsigned int bond_hash_tcp(const struct flow *, uint16_t vlan,
170 static struct bond_entry *lookup_bond_entry(const struct bond *,
173 OVS_REQ_RDLOCK(rwlock);
174 static struct bond_slave *get_enabled_slave(struct bond *)
175 OVS_REQ_RDLOCK(rwlock);
176 static struct bond_slave *choose_output_slave(const struct bond *,
178 struct flow_wildcards *,
180 OVS_REQ_RDLOCK(rwlock);
181 static void bond_update_fake_slave_stats(struct bond *)
182 OVS_REQ_RDLOCK(rwlock);
184 /* Attempts to parse 's' as the name of a bond balancing mode. If successful,
185 * stores the mode in '*balance' and returns true. Otherwise returns false
186 * without modifying '*balance'. */
188 bond_mode_from_string(enum bond_mode *balance, const char *s)
190 if (!strcmp(s, bond_mode_to_string(BM_TCP))) {
192 } else if (!strcmp(s, bond_mode_to_string(BM_SLB))) {
194 } else if (!strcmp(s, bond_mode_to_string(BM_AB))) {
202 /* Returns a string representing 'balance'. */
204 bond_mode_to_string(enum bond_mode balance) {
207 return "balance-tcp";
209 return "balance-slb";
211 return "active-backup";
217 /* Creates and returns a new bond whose configuration is initially taken from
220 * The caller should register each slave on the new bond by calling
221 * bond_slave_register(). */
223 bond_create(const struct bond_settings *s, struct ofproto_dpif *ofproto)
227 bond = xzalloc(sizeof *bond);
228 bond->ofproto = ofproto;
229 hmap_init(&bond->slaves);
230 list_init(&bond->enabled_slaves);
231 ovs_mutex_init(&bond->mutex);
232 bond->next_fake_iface_update = LLONG_MAX;
233 ovs_refcount_init(&bond->ref_cnt);
236 hmap_init(&bond->pr_rule_ops);
238 bond_reconfigure(bond, s);
243 bond_ref(const struct bond *bond_)
245 struct bond *bond = CONST_CAST(struct bond *, bond_);
248 ovs_refcount_ref(&bond->ref_cnt);
255 bond_unref(struct bond *bond)
257 struct bond_slave *slave, *next_slave;
258 struct bond_pr_rule_op *pr_op, *next_op;
260 if (!bond || ovs_refcount_unref(&bond->ref_cnt) != 1) {
264 ovs_rwlock_wrlock(&rwlock);
265 hmap_remove(all_bonds, &bond->hmap_node);
266 ovs_rwlock_unlock(&rwlock);
268 HMAP_FOR_EACH_SAFE (slave, next_slave, hmap_node, &bond->slaves) {
269 hmap_remove(&bond->slaves, &slave->hmap_node);
270 /* Client owns 'slave->netdev'. */
274 hmap_destroy(&bond->slaves);
276 ovs_mutex_destroy(&bond->mutex);
280 HMAP_FOR_EACH_SAFE(pr_op, next_op, hmap_node, &bond->pr_rule_ops) {
281 hmap_remove(&bond->pr_rule_ops, &pr_op->hmap_node);
284 hmap_destroy(&bond->pr_rule_ops);
286 if (bond->recirc_id) {
287 ofproto_dpif_free_recirc_id(bond->ofproto, bond->recirc_id);
294 add_pr_rule(struct bond *bond, const struct match *match,
295 ofp_port_t out_ofport, struct rule **rule)
297 uint32_t hash = match_hash(match, 0);
298 struct bond_pr_rule_op *pr_op;
300 HMAP_FOR_EACH_WITH_HASH(pr_op, hmap_node, hash, &bond->pr_rule_ops) {
301 if (match_equal(&pr_op->match, match)) {
303 pr_op->out_ofport = out_ofport;
304 pr_op->pr_rule = rule;
309 pr_op = xmalloc(sizeof *pr_op);
310 pr_op->match = *match;
312 pr_op->out_ofport = out_ofport;
313 pr_op->pr_rule = rule;
314 hmap_insert(&bond->pr_rule_ops, &pr_op->hmap_node, hash);
318 update_recirc_rules(struct bond *bond)
321 struct bond_pr_rule_op *pr_op, *next_op;
322 uint64_t ofpacts_stub[128 / 8];
323 struct ofpbuf ofpacts;
326 ofpbuf_use_stub(&ofpacts, ofpacts_stub, sizeof ofpacts_stub);
328 HMAP_FOR_EACH(pr_op, hmap_node, &bond->pr_rule_ops) {
332 if (bond->hash && bond->recirc_id) {
333 for (i = 0; i < BOND_BUCKETS; i++) {
334 struct bond_slave *slave = bond->hash[i].slave;
337 match_init_catchall(&match);
338 match_set_recirc_id(&match, bond->recirc_id);
339 match_set_dp_hash_masked(&match, i, BOND_MASK);
341 add_pr_rule(bond, &match, slave->ofp_port,
342 &bond->hash[i].pr_rule);
347 HMAP_FOR_EACH_SAFE(pr_op, next_op, hmap_node, &bond->pr_rule_ops) {
351 ofpbuf_clear(&ofpacts);
352 ofpact_put_OUTPUT(&ofpacts)->port = pr_op->out_ofport;
353 error = ofproto_dpif_add_internal_flow(bond->ofproto,
355 RECIRC_RULE_PRIORITY,
356 &ofpacts, pr_op->pr_rule);
358 char *err_s = match_to_string(&pr_op->match,
359 RECIRC_RULE_PRIORITY);
361 VLOG_ERR("failed to add post recirculation flow %s", err_s);
367 error = ofproto_dpif_delete_internal_flow(bond->ofproto,
369 RECIRC_RULE_PRIORITY);
371 char *err_s = match_to_string(&pr_op->match,
372 RECIRC_RULE_PRIORITY);
374 VLOG_ERR("failed to remove post recirculation flow %s", err_s);
378 hmap_remove(&bond->pr_rule_ops, &pr_op->hmap_node);
379 *pr_op->pr_rule = NULL;
385 ofpbuf_uninit(&ofpacts);
389 /* Updates 'bond''s overall configuration to 's'.
391 * The caller should register each slave on 'bond' by calling
392 * bond_slave_register(). This is optional if none of the slaves'
393 * configuration has changed. In any case it can't hurt.
395 * Returns true if the configuration has changed in such a way that requires
399 bond_reconfigure(struct bond *bond, const struct bond_settings *s)
401 bool revalidate = false;
403 ovs_rwlock_wrlock(&rwlock);
404 if (!bond->name || strcmp(bond->name, s->name)) {
406 hmap_remove(all_bonds, &bond->hmap_node);
409 bond->name = xstrdup(s->name);
410 hmap_insert(all_bonds, &bond->hmap_node, hash_string(bond->name, 0));
413 bond->updelay = s->up_delay;
414 bond->downdelay = s->down_delay;
416 if (bond->lacp_fallback_ab != s->lacp_fallback_ab_cfg) {
417 bond->lacp_fallback_ab = s->lacp_fallback_ab_cfg;
421 if (bond->rebalance_interval != s->rebalance_interval) {
422 bond->rebalance_interval = s->rebalance_interval;
426 if (bond->balance != s->balance) {
427 bond->balance = s->balance;
431 if (bond->basis != s->basis) {
432 bond->basis = s->basis;
437 if (bond->next_fake_iface_update == LLONG_MAX) {
438 bond->next_fake_iface_update = time_msec();
441 bond->next_fake_iface_update = LLONG_MAX;
444 if (bond->bond_revalidate) {
446 bond->bond_revalidate = false;
449 if (bond->balance != BM_AB) {
450 if (!bond->recirc_id) {
451 bond->recirc_id = ofproto_dpif_alloc_recirc_id(bond->ofproto);
453 } else if (bond->recirc_id) {
454 ofproto_dpif_free_recirc_id(bond->ofproto, bond->recirc_id);
458 if (bond->balance == BM_AB || !bond->hash || revalidate) {
459 bond_entry_reset(bond);
462 ovs_rwlock_unlock(&rwlock);
467 bond_slave_set_netdev__(struct bond_slave *slave, struct netdev *netdev)
468 OVS_REQ_WRLOCK(rwlock)
470 if (slave->netdev != netdev) {
471 slave->netdev = netdev;
472 slave->change_seq = 0;
476 /* Registers 'slave_' as a slave of 'bond'. The 'slave_' pointer is an
477 * arbitrary client-provided pointer that uniquely identifies a slave within a
478 * bond. If 'slave_' already exists within 'bond' then this function
479 * reconfigures the existing slave.
481 * 'netdev' must be the network device that 'slave_' represents. It is owned
482 * by the client, so the client must not close it before either unregistering
483 * 'slave_' or destroying 'bond'.
486 bond_slave_register(struct bond *bond, void *slave_,
487 ofp_port_t ofport, struct netdev *netdev)
489 struct bond_slave *slave;
491 ovs_rwlock_wrlock(&rwlock);
492 slave = bond_slave_lookup(bond, slave_);
494 slave = xzalloc(sizeof *slave);
496 hmap_insert(&bond->slaves, &slave->hmap_node, hash_pointer(slave_, 0));
499 slave->ofp_port = ofport;
500 slave->delay_expires = LLONG_MAX;
501 slave->name = xstrdup(netdev_get_name(netdev));
502 bond->bond_revalidate = true;
504 slave->enabled = false;
505 bond_enable_slave(slave, netdev_get_carrier(netdev));
508 bond_slave_set_netdev__(slave, netdev);
511 slave->name = xstrdup(netdev_get_name(netdev));
512 ovs_rwlock_unlock(&rwlock);
515 /* Updates the network device to be used with 'slave_' to 'netdev'.
517 * This is useful if the caller closes and re-opens the network device
518 * registered with bond_slave_register() but doesn't need to change anything
521 bond_slave_set_netdev(struct bond *bond, void *slave_, struct netdev *netdev)
523 struct bond_slave *slave;
525 ovs_rwlock_wrlock(&rwlock);
526 slave = bond_slave_lookup(bond, slave_);
528 bond_slave_set_netdev__(slave, netdev);
530 ovs_rwlock_unlock(&rwlock);
533 /* Unregisters 'slave_' from 'bond'. If 'bond' does not contain such a slave
534 * then this function has no effect.
536 * Unregistering a slave invalidates all flows. */
538 bond_slave_unregister(struct bond *bond, const void *slave_)
540 struct bond_slave *slave;
543 ovs_rwlock_wrlock(&rwlock);
544 slave = bond_slave_lookup(bond, slave_);
549 bond->bond_revalidate = true;
550 bond_enable_slave(slave, false);
552 del_active = bond->active_slave == slave;
554 struct bond_entry *e;
555 for (e = bond->hash; e <= &bond->hash[BOND_MASK]; e++) {
556 if (e->slave == slave) {
564 hmap_remove(&bond->slaves, &slave->hmap_node);
565 /* Client owns 'slave->netdev'. */
569 bond_choose_active_slave(bond);
570 bond->send_learning_packets = true;
573 ovs_rwlock_unlock(&rwlock);
576 /* Should be called on each slave in 'bond' before bond_run() to indicate
577 * whether or not 'slave_' may be enabled. This function is intended to allow
578 * other protocols to have some impact on bonding decisions. For example LACP
579 * or high level link monitoring protocols may decide that a given slave should
580 * not be able to send traffic. */
582 bond_slave_set_may_enable(struct bond *bond, void *slave_, bool may_enable)
584 ovs_rwlock_wrlock(&rwlock);
585 bond_slave_lookup(bond, slave_)->may_enable = may_enable;
586 ovs_rwlock_unlock(&rwlock);
589 /* Performs periodic maintenance on 'bond'.
591 * Returns true if the caller should revalidate its flows.
593 * The caller should check bond_should_send_learning_packets() afterward. */
595 bond_run(struct bond *bond, enum lacp_status lacp_status)
597 struct bond_slave *slave;
600 ovs_rwlock_wrlock(&rwlock);
601 if (bond->lacp_status != lacp_status) {
602 bond->lacp_status = lacp_status;
603 bond->bond_revalidate = true;
606 /* Enable slaves based on link status and LACP feedback. */
607 HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) {
608 bond_link_status_update(slave);
609 slave->change_seq = seq_read(connectivity_seq_get());
611 if (!bond->active_slave || !bond->active_slave->enabled) {
612 bond_choose_active_slave(bond);
615 /* Update fake bond interface stats. */
616 if (time_msec() >= bond->next_fake_iface_update) {
617 bond_update_fake_slave_stats(bond);
618 bond->next_fake_iface_update = time_msec() + 1000;
621 revalidate = bond->bond_revalidate;
622 bond->bond_revalidate = false;
623 ovs_rwlock_unlock(&rwlock);
628 /* Causes poll_block() to wake up when 'bond' needs something to be done. */
630 bond_wait(struct bond *bond)
632 struct bond_slave *slave;
634 ovs_rwlock_rdlock(&rwlock);
635 HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) {
636 if (slave->delay_expires != LLONG_MAX) {
637 poll_timer_wait_until(slave->delay_expires);
640 seq_wait(connectivity_seq_get(), slave->change_seq);
643 if (bond->next_fake_iface_update != LLONG_MAX) {
644 poll_timer_wait_until(bond->next_fake_iface_update);
647 if (bond->bond_revalidate) {
648 poll_immediate_wake();
650 ovs_rwlock_unlock(&rwlock);
652 /* We don't wait for bond->next_rebalance because rebalancing can only run
653 * at a flow account checkpoint. ofproto does checkpointing on its own
654 * schedule and bond_rebalance() gets called afterward, so we'd just be
655 * waking up for no purpose. */
658 /* MAC learning table interaction. */
661 may_send_learning_packets(const struct bond *bond)
663 return ((bond->lacp_status == LACP_DISABLED
664 && (bond->balance == BM_SLB || bond->balance == BM_AB))
665 || (bond->lacp_fallback_ab && bond->lacp_status == LACP_CONFIGURED))
666 && bond->active_slave;
669 /* Returns true if 'bond' needs the client to send out packets to assist with
670 * MAC learning on 'bond'. If this function returns true, then the client
671 * should iterate through its MAC learning table for the bridge on which 'bond'
672 * is located. For each MAC that has been learned on a port other than 'bond',
673 * it should call bond_compose_learning_packet().
675 * This function will only return true if 'bond' is in SLB or active-backup
676 * mode and LACP is not negotiated. Otherwise sending learning packets isn't
679 * Calling this function resets the state that it checks. */
681 bond_should_send_learning_packets(struct bond *bond)
685 ovs_rwlock_wrlock(&rwlock);
686 send = bond->send_learning_packets && may_send_learning_packets(bond);
687 bond->send_learning_packets = false;
688 ovs_rwlock_unlock(&rwlock);
692 /* Sends a gratuitous learning packet on 'bond' from 'eth_src' on 'vlan'.
694 * See bond_should_send_learning_packets() for description of usage. The
695 * caller should send the composed packet on the port associated with
696 * port_aux and takes ownership of the returned ofpbuf. */
698 bond_compose_learning_packet(struct bond *bond,
699 const uint8_t eth_src[ETH_ADDR_LEN],
700 uint16_t vlan, void **port_aux)
702 struct bond_slave *slave;
703 struct ofpbuf *packet;
706 ovs_rwlock_rdlock(&rwlock);
707 ovs_assert(may_send_learning_packets(bond));
708 memset(&flow, 0, sizeof flow);
709 memcpy(flow.dl_src, eth_src, ETH_ADDR_LEN);
710 slave = choose_output_slave(bond, &flow, NULL, vlan);
712 packet = ofpbuf_new(0);
713 compose_rarp(packet, eth_src);
715 eth_push_vlan(packet, htons(ETH_TYPE_VLAN), htons(vlan));
718 *port_aux = slave->aux;
719 ovs_rwlock_unlock(&rwlock);
723 /* Checks whether a packet that arrived on 'slave_' within 'bond', with an
724 * Ethernet destination address of 'eth_dst', should be admitted.
726 * The return value is one of the following:
728 * - BV_ACCEPT: Admit the packet.
730 * - BV_DROP: Drop the packet.
732 * - BV_DROP_IF_MOVED: Consult the MAC learning table for the packet's
733 * Ethernet source address and VLAN. If there is none, or if the packet
734 * is on the learned port, then admit the packet. If a different port has
735 * been learned, however, drop the packet (and do not use it for MAC
739 bond_check_admissibility(struct bond *bond, const void *slave_,
740 const uint8_t eth_dst[ETH_ADDR_LEN])
742 enum bond_verdict verdict = BV_DROP;
743 struct bond_slave *slave;
745 ovs_rwlock_rdlock(&rwlock);
746 slave = bond_slave_lookup(bond, slave_);
751 /* LACP bonds have very loose admissibility restrictions because we can
752 * assume the remote switch is aware of the bond and will "do the right
753 * thing". However, as a precaution we drop packets on disabled slaves
754 * because no correctly implemented partner switch should be sending
757 * If LACP is configured, but LACP negotiations have been unsuccessful, we
758 * drop all incoming traffic except if lacp_fallback_ab is enabled. */
759 switch (bond->lacp_status) {
760 case LACP_NEGOTIATED:
761 verdict = slave->enabled ? BV_ACCEPT : BV_DROP;
763 case LACP_CONFIGURED:
764 if (!bond->lacp_fallback_ab) {
771 /* Drop all multicast packets on inactive slaves. */
772 if (eth_addr_is_multicast(eth_dst)) {
773 if (bond->active_slave != slave) {
778 switch (bond->balance) {
780 /* TCP balanced bonds require successful LACP negotiations. Based on the
781 * above check, LACP is off or lacp_fallback_ab is true on this bond.
782 * If lacp_fallback_ab is true fall through to BM_AB case else, we
783 * drop all incoming traffic. */
784 if (!bond->lacp_fallback_ab) {
789 /* Drop all packets which arrive on backup slaves. This is similar to
790 * how Linux bonding handles active-backup bonds. */
791 if (bond->active_slave != slave) {
792 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
794 VLOG_DBG_RL(&rl, "active-backup bond received packet on backup"
795 " slave (%s) destined for " ETH_ADDR_FMT,
796 slave->name, ETH_ADDR_ARGS(eth_dst));
803 /* Drop all packets for which we have learned a different input port,
804 * because we probably sent the packet on one slave and got it back on
805 * the other. Gratuitous ARP packets are an exception to this rule:
806 * the host has moved to another switch. The exception to the
807 * exception is if we locked the learning table to avoid reflections on
809 verdict = BV_DROP_IF_MOVED;
815 ovs_rwlock_unlock(&rwlock);
820 /* Returns the slave (registered on 'bond' by bond_slave_register()) to which
821 * a packet with the given 'flow' and 'vlan' should be forwarded. Returns
822 * NULL if the packet should be dropped because no slaves are enabled.
824 * 'vlan' is not necessarily the same as 'flow->vlan_tci'. First, 'vlan'
825 * should be a VID only (i.e. excluding the PCP bits). Second,
826 * 'flow->vlan_tci' is the VLAN TCI that appeared on the packet (so it will be
827 * nonzero only for trunk ports), whereas 'vlan' is the logical VLAN that the
828 * packet belongs to (so for an access port it will be the access port's VLAN).
830 * If 'wc' is non-NULL, bitwise-OR's 'wc' with the set of bits that were
831 * significant in the selection. At some point earlier, 'wc' should
832 * have been initialized (e.g., by flow_wildcards_init_catchall()).
835 bond_choose_output_slave(struct bond *bond, const struct flow *flow,
836 struct flow_wildcards *wc, uint16_t vlan)
838 struct bond_slave *slave;
841 ovs_rwlock_rdlock(&rwlock);
842 slave = choose_output_slave(bond, flow, wc, vlan);
843 aux = slave ? slave->aux : NULL;
844 ovs_rwlock_unlock(&rwlock);
851 bond_entry_account(struct bond_entry *entry, uint64_t rule_tx_bytes)
852 OVS_REQ_WRLOCK(rwlock)
857 delta = rule_tx_bytes - entry->pr_tx_bytes;
858 entry->tx_bytes += delta;
859 entry->pr_tx_bytes = rule_tx_bytes;
863 /* Maintain bond stats using post recirculation rule byte counters.*/
865 bond_recirculation_account(struct bond *bond)
866 OVS_REQ_WRLOCK(rwlock)
870 for (i=0; i<=BOND_MASK; i++) {
871 struct bond_entry *entry = &bond->hash[i];
872 struct rule *rule = entry->pr_rule;
875 uint64_t n_packets OVS_UNUSED;
876 long long int used OVS_UNUSED;
879 rule->ofproto->ofproto_class->rule_get_stats(
880 rule, &n_packets, &n_bytes, &used);
881 bond_entry_account(entry, n_bytes);
887 bond_may_recirc(const struct bond *bond, uint32_t *recirc_id,
890 if (bond->balance == BM_TCP && bond->recirc_id) {
892 *recirc_id = bond->recirc_id;
895 *hash_bias = bond->basis;
904 bond_update_post_recirc_rules(struct bond* bond, const bool force)
906 struct bond_entry *e;
907 bool update_rules = force; /* Always update rules if caller forces it. */
909 /* Make sure all bond entries are populated */
910 for (e = bond->hash; e <= &bond->hash[BOND_MASK]; e++) {
911 if (!e->slave || !e->slave->enabled) {
913 e->slave = CONTAINER_OF(hmap_random_node(&bond->slaves),
914 struct bond_slave, hmap_node);
915 if (!e->slave->enabled) {
916 e->slave = bond->active_slave;
922 update_recirc_rules(bond);
929 bond_is_balanced(const struct bond *bond) OVS_REQ_RDLOCK(rwlock)
931 return bond->rebalance_interval
932 && (bond->balance == BM_SLB || bond->balance == BM_TCP);
935 /* Notifies 'bond' that 'n_bytes' bytes were sent in 'flow' within 'vlan'. */
937 bond_account(struct bond *bond, const struct flow *flow, uint16_t vlan,
940 ovs_rwlock_wrlock(&rwlock);
941 if (bond_is_balanced(bond)) {
942 lookup_bond_entry(bond, flow, vlan)->tx_bytes += n_bytes;
944 ovs_rwlock_unlock(&rwlock);
947 static struct bond_slave *
948 bond_slave_from_bal_node(struct list *bal) OVS_REQ_RDLOCK(rwlock)
950 return CONTAINER_OF(bal, struct bond_slave, bal_node);
954 log_bals(struct bond *bond, const struct list *bals)
955 OVS_REQ_RDLOCK(rwlock)
957 if (VLOG_IS_DBG_ENABLED()) {
958 struct ds ds = DS_EMPTY_INITIALIZER;
959 const struct bond_slave *slave;
961 LIST_FOR_EACH (slave, bal_node, bals) {
963 ds_put_char(&ds, ',');
965 ds_put_format(&ds, " %s %"PRIu64"kB",
966 slave->name, slave->tx_bytes / 1024);
968 if (!slave->enabled) {
969 ds_put_cstr(&ds, " (disabled)");
971 if (!list_is_empty(&slave->entries)) {
972 struct bond_entry *e;
974 ds_put_cstr(&ds, " (");
975 LIST_FOR_EACH (e, list_node, &slave->entries) {
976 if (&e->list_node != list_front(&slave->entries)) {
977 ds_put_cstr(&ds, " + ");
979 ds_put_format(&ds, "h%"PRIdPTR": %"PRIu64"kB",
980 e - bond->hash, e->tx_bytes / 1024);
982 ds_put_cstr(&ds, ")");
985 VLOG_DBG("bond %s:%s", bond->name, ds_cstr(&ds));
990 /* Shifts 'hash' from its current slave to 'to'. */
992 bond_shift_load(struct bond_entry *hash, struct bond_slave *to)
993 OVS_REQ_WRLOCK(rwlock)
995 struct bond_slave *from = hash->slave;
996 struct bond *bond = from->bond;
997 uint64_t delta = hash->tx_bytes;
999 VLOG_INFO("bond %s: shift %"PRIu64"kB of load (with hash %"PRIdPTR") "
1000 "from %s to %s (now carrying %"PRIu64"kB and "
1001 "%"PRIu64"kB load, respectively)",
1002 bond->name, delta / 1024, hash - bond->hash,
1003 from->name, to->name,
1004 (from->tx_bytes - delta) / 1024,
1005 (to->tx_bytes + delta) / 1024);
1007 /* Shift load away from 'from' to 'to'. */
1008 from->tx_bytes -= delta;
1009 to->tx_bytes += delta;
1011 /* Arrange for flows to be revalidated. */
1013 bond->bond_revalidate = true;
1016 /* Picks and returns a bond_entry to migrate from 'from' (the most heavily
1017 * loaded bond slave) to a bond slave that has 'to_tx_bytes' bytes of load,
1018 * given that doing so must decrease the ratio of the load on the two slaves by
1019 * at least 0.1. Returns NULL if there is no appropriate entry.
1021 * The list of entries isn't sorted. I don't know of a reason to prefer to
1022 * shift away small hashes or large hashes. */
1023 static struct bond_entry *
1024 choose_entry_to_migrate(const struct bond_slave *from, uint64_t to_tx_bytes)
1025 OVS_REQ_WRLOCK(rwlock)
1027 struct bond_entry *e;
1029 if (list_is_short(&from->entries)) {
1030 /* 'from' carries no more than one MAC hash, so shifting load away from
1031 * it would be pointless. */
1035 LIST_FOR_EACH (e, list_node, &from->entries) {
1036 double old_ratio, new_ratio;
1039 if (to_tx_bytes == 0) {
1040 /* Nothing on the new slave, move it. */
1044 delta = e->tx_bytes;
1045 old_ratio = (double)from->tx_bytes / to_tx_bytes;
1046 new_ratio = (double)(from->tx_bytes - delta) / (to_tx_bytes + delta);
1047 if (old_ratio - new_ratio > 0.1
1048 && fabs(new_ratio - 1.0) < fabs(old_ratio - 1.0)) {
1049 /* We're aiming for an ideal ratio of 1, meaning both the 'from'
1050 and 'to' slave have the same load. Therefore, we only move an
1051 entry if it decreases the load on 'from', and brings us closer
1052 to equal traffic load. */
1060 /* Inserts 'slave' into 'bals' so that descending order of 'tx_bytes' is
1063 insert_bal(struct list *bals, struct bond_slave *slave)
1065 struct bond_slave *pos;
1067 LIST_FOR_EACH (pos, bal_node, bals) {
1068 if (slave->tx_bytes > pos->tx_bytes) {
1072 list_insert(&pos->bal_node, &slave->bal_node);
1075 /* Removes 'slave' from its current list and then inserts it into 'bals' so
1076 * that descending order of 'tx_bytes' is maintained. */
1078 reinsert_bal(struct list *bals, struct bond_slave *slave)
1080 list_remove(&slave->bal_node);
1081 insert_bal(bals, slave);
1084 /* If 'bond' needs rebalancing, does so.
1086 * The caller should have called bond_account() for each active flow, or in case
1087 * of recirculation is used, have called bond_recirculation_account(bond),
1088 * to ensure that flow data is consistently accounted at this point.
1091 bond_rebalance(struct bond *bond)
1093 struct bond_slave *slave;
1094 struct bond_entry *e;
1096 bool rebalanced = false;
1099 ovs_rwlock_wrlock(&rwlock);
1100 if (!bond_is_balanced(bond) || time_msec() < bond->next_rebalance) {
1103 bond->next_rebalance = time_msec() + bond->rebalance_interval;
1105 use_recirc = ofproto_dpif_get_enable_recirc(bond->ofproto) &&
1106 bond_may_recirc(bond, NULL, NULL);
1109 bond_recirculation_account(bond);
1112 /* Add each bond_entry to its slave's 'entries' list.
1113 * Compute each slave's tx_bytes as the sum of its entries' tx_bytes. */
1114 HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) {
1115 slave->tx_bytes = 0;
1116 list_init(&slave->entries);
1118 for (e = &bond->hash[0]; e <= &bond->hash[BOND_MASK]; e++) {
1119 if (e->slave && e->tx_bytes) {
1120 e->slave->tx_bytes += e->tx_bytes;
1121 list_push_back(&e->slave->entries, &e->list_node);
1125 /* Add enabled slaves to 'bals' in descending order of tx_bytes.
1127 * XXX This is O(n**2) in the number of slaves but it could be O(n lg n)
1128 * with a proper list sort algorithm. */
1130 HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) {
1131 if (slave->enabled) {
1132 insert_bal(&bals, slave);
1135 log_bals(bond, &bals);
1137 /* Shift load from the most-loaded slaves to the least-loaded slaves. */
1138 while (!list_is_short(&bals)) {
1139 struct bond_slave *from = bond_slave_from_bal_node(list_front(&bals));
1140 struct bond_slave *to = bond_slave_from_bal_node(list_back(&bals));
1143 overload = from->tx_bytes - to->tx_bytes;
1144 if (overload < to->tx_bytes >> 5 || overload < 100000) {
1145 /* The extra load on 'from' (and all less-loaded slaves), compared
1146 * to that of 'to' (the least-loaded slave), is less than ~3%, or
1147 * it is less than ~1Mbps. No point in rebalancing. */
1151 /* 'from' is carrying significantly more load than 'to'. Pick a hash
1152 * to move from 'from' to 'to'. */
1153 e = choose_entry_to_migrate(from, to->tx_bytes);
1155 bond_shift_load(e, to);
1157 /* Delete element from from->entries.
1159 * We don't add the element to to->hashes. That would only allow
1160 * 'e' to be migrated to another slave in this rebalancing run, and
1161 * there is no point in doing that. */
1162 list_remove(&e->list_node);
1164 /* Re-sort 'bals'. */
1165 reinsert_bal(&bals, from);
1166 reinsert_bal(&bals, to);
1169 /* Can't usefully migrate anything away from 'from'.
1170 * Don't reconsider it. */
1171 list_remove(&from->bal_node);
1175 /* Implement exponentially weighted moving average. A weight of 1/2 causes
1176 * historical data to decay to <1% in 7 rebalancing runs. 1,000,000 bytes
1177 * take 20 rebalancing runs to decay to 0 and get deleted entirely. */
1178 for (e = &bond->hash[0]; e <= &bond->hash[BOND_MASK]; e++) {
1182 if (use_recirc && rebalanced) {
1183 bond_update_post_recirc_rules(bond,true);
1187 ovs_rwlock_unlock(&rwlock);
1190 /* Bonding unixctl user interface functions. */
1192 static struct bond *
1193 bond_find(const char *name) OVS_REQ_RDLOCK(rwlock)
1197 HMAP_FOR_EACH_WITH_HASH (bond, hmap_node, hash_string(name, 0),
1199 if (!strcmp(bond->name, name)) {
1206 static struct bond_slave *
1207 bond_lookup_slave(struct bond *bond, const char *slave_name)
1209 struct bond_slave *slave;
1211 HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) {
1212 if (!strcmp(slave->name, slave_name)) {
1220 bond_unixctl_list(struct unixctl_conn *conn,
1221 int argc OVS_UNUSED, const char *argv[] OVS_UNUSED,
1222 void *aux OVS_UNUSED)
1224 struct ds ds = DS_EMPTY_INITIALIZER;
1225 const struct bond *bond;
1227 ds_put_cstr(&ds, "bond\ttype\trecircID\tslaves\n");
1229 ovs_rwlock_rdlock(&rwlock);
1230 HMAP_FOR_EACH (bond, hmap_node, all_bonds) {
1231 const struct bond_slave *slave;
1234 ds_put_format(&ds, "%s\t%s\t%d\t", bond->name,
1235 bond_mode_to_string(bond->balance), bond->recirc_id);
1238 HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) {
1240 ds_put_cstr(&ds, ", ");
1242 ds_put_cstr(&ds, slave->name);
1244 ds_put_char(&ds, '\n');
1246 ovs_rwlock_unlock(&rwlock);
1247 unixctl_command_reply(conn, ds_cstr(&ds));
1252 bond_print_details(struct ds *ds, const struct bond *bond)
1253 OVS_REQ_RDLOCK(rwlock)
1255 struct shash slave_shash = SHASH_INITIALIZER(&slave_shash);
1256 const struct shash_node **sorted_slaves = NULL;
1257 const struct bond_slave *slave;
1262 ds_put_format(ds, "---- %s ----\n", bond->name);
1263 ds_put_format(ds, "bond_mode: %s\n",
1264 bond_mode_to_string(bond->balance));
1266 may_recirc = bond_may_recirc(bond, &recirc_id, NULL);
1267 ds_put_format(ds, "bond may use recirculation: %s, Recirc-ID : %d\n",
1268 may_recirc ? "yes" : "no", may_recirc ? recirc_id: -1);
1270 ds_put_format(ds, "bond-hash-basis: %"PRIu32"\n", bond->basis);
1272 ds_put_format(ds, "updelay: %d ms\n", bond->updelay);
1273 ds_put_format(ds, "downdelay: %d ms\n", bond->downdelay);
1275 if (bond_is_balanced(bond)) {
1276 ds_put_format(ds, "next rebalance: %lld ms\n",
1277 bond->next_rebalance - time_msec());
1280 ds_put_cstr(ds, "lacp_status: ");
1281 switch (bond->lacp_status) {
1282 case LACP_NEGOTIATED:
1283 ds_put_cstr(ds, "negotiated\n");
1285 case LACP_CONFIGURED:
1286 ds_put_cstr(ds, "configured\n");
1289 ds_put_cstr(ds, "off\n");
1292 ds_put_cstr(ds, "<unknown>\n");
1296 HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) {
1297 shash_add(&slave_shash, slave->name, slave);
1299 sorted_slaves = shash_sort(&slave_shash);
1301 for (i = 0; i < shash_count(&slave_shash); i++) {
1302 struct bond_entry *be;
1304 slave = sorted_slaves[i]->data;
1307 ds_put_format(ds, "\nslave %s: %s\n",
1308 slave->name, slave->enabled ? "enabled" : "disabled");
1309 if (slave == bond->active_slave) {
1310 ds_put_cstr(ds, "\tactive slave\n");
1312 if (slave->delay_expires != LLONG_MAX) {
1313 ds_put_format(ds, "\t%s expires in %lld ms\n",
1314 slave->enabled ? "downdelay" : "updelay",
1315 slave->delay_expires - time_msec());
1318 ds_put_format(ds, "\tmay_enable: %s\n",
1319 slave->may_enable ? "true" : "false");
1321 if (!bond_is_balanced(bond)) {
1326 for (be = bond->hash; be <= &bond->hash[BOND_MASK]; be++) {
1327 int hash = be - bond->hash;
1330 if (be->slave != slave) {
1334 be_tx_k = be->tx_bytes / 1024;
1336 ds_put_format(ds, "\thash %d: %"PRIu64" kB load\n",
1340 /* XXX How can we list the MACs assigned to hashes of SLB bonds? */
1343 shash_destroy(&slave_shash);
1344 free(sorted_slaves);
1345 ds_put_cstr(ds, "\n");
1349 bond_unixctl_show(struct unixctl_conn *conn,
1350 int argc, const char *argv[],
1351 void *aux OVS_UNUSED)
1353 struct ds ds = DS_EMPTY_INITIALIZER;
1355 ovs_rwlock_rdlock(&rwlock);
1357 const struct bond *bond = bond_find(argv[1]);
1360 unixctl_command_reply_error(conn, "no such bond");
1363 bond_print_details(&ds, bond);
1365 const struct bond *bond;
1367 HMAP_FOR_EACH (bond, hmap_node, all_bonds) {
1368 bond_print_details(&ds, bond);
1372 unixctl_command_reply(conn, ds_cstr(&ds));
1376 ovs_rwlock_unlock(&rwlock);
1380 bond_unixctl_migrate(struct unixctl_conn *conn,
1381 int argc OVS_UNUSED, const char *argv[],
1382 void *aux OVS_UNUSED)
1384 const char *bond_s = argv[1];
1385 const char *hash_s = argv[2];
1386 const char *slave_s = argv[3];
1388 struct bond_slave *slave;
1389 struct bond_entry *entry;
1392 ovs_rwlock_wrlock(&rwlock);
1393 bond = bond_find(bond_s);
1395 unixctl_command_reply_error(conn, "no such bond");
1399 if (bond->balance != BM_SLB) {
1400 unixctl_command_reply_error(conn, "not an SLB bond");
1404 if (strspn(hash_s, "0123456789") == strlen(hash_s)) {
1405 hash = atoi(hash_s) & BOND_MASK;
1407 unixctl_command_reply_error(conn, "bad hash");
1411 slave = bond_lookup_slave(bond, slave_s);
1413 unixctl_command_reply_error(conn, "no such slave");
1417 if (!slave->enabled) {
1418 unixctl_command_reply_error(conn, "cannot migrate to disabled slave");
1422 entry = &bond->hash[hash];
1423 bond->bond_revalidate = true;
1424 entry->slave = slave;
1425 unixctl_command_reply(conn, "migrated");
1428 ovs_rwlock_unlock(&rwlock);
1432 bond_unixctl_set_active_slave(struct unixctl_conn *conn,
1433 int argc OVS_UNUSED, const char *argv[],
1434 void *aux OVS_UNUSED)
1436 const char *bond_s = argv[1];
1437 const char *slave_s = argv[2];
1439 struct bond_slave *slave;
1441 ovs_rwlock_wrlock(&rwlock);
1442 bond = bond_find(bond_s);
1444 unixctl_command_reply_error(conn, "no such bond");
1448 slave = bond_lookup_slave(bond, slave_s);
1450 unixctl_command_reply_error(conn, "no such slave");
1454 if (!slave->enabled) {
1455 unixctl_command_reply_error(conn, "cannot make disabled slave active");
1459 if (bond->active_slave != slave) {
1460 bond->bond_revalidate = true;
1461 bond->active_slave = slave;
1462 VLOG_INFO("bond %s: active interface is now %s",
1463 bond->name, slave->name);
1464 bond->send_learning_packets = true;
1465 unixctl_command_reply(conn, "done");
1467 unixctl_command_reply(conn, "no change");
1470 ovs_rwlock_unlock(&rwlock);
1474 enable_slave(struct unixctl_conn *conn, const char *argv[], bool enable)
1476 const char *bond_s = argv[1];
1477 const char *slave_s = argv[2];
1479 struct bond_slave *slave;
1481 ovs_rwlock_wrlock(&rwlock);
1482 bond = bond_find(bond_s);
1484 unixctl_command_reply_error(conn, "no such bond");
1488 slave = bond_lookup_slave(bond, slave_s);
1490 unixctl_command_reply_error(conn, "no such slave");
1494 bond_enable_slave(slave, enable);
1495 unixctl_command_reply(conn, enable ? "enabled" : "disabled");
1498 ovs_rwlock_unlock(&rwlock);
1502 bond_unixctl_enable_slave(struct unixctl_conn *conn,
1503 int argc OVS_UNUSED, const char *argv[],
1504 void *aux OVS_UNUSED)
1506 enable_slave(conn, argv, true);
1510 bond_unixctl_disable_slave(struct unixctl_conn *conn,
1511 int argc OVS_UNUSED, const char *argv[],
1512 void *aux OVS_UNUSED)
1514 enable_slave(conn, argv, false);
1518 bond_unixctl_hash(struct unixctl_conn *conn, int argc, const char *argv[],
1519 void *aux OVS_UNUSED)
1521 const char *mac_s = argv[1];
1522 const char *vlan_s = argc > 2 ? argv[2] : NULL;
1523 const char *basis_s = argc > 3 ? argv[3] : NULL;
1524 uint8_t mac[ETH_ADDR_LEN];
1531 if (!ovs_scan(vlan_s, "%u", &vlan)) {
1532 unixctl_command_reply_error(conn, "invalid vlan");
1540 if (!ovs_scan(basis_s, "%"SCNu32, &basis)) {
1541 unixctl_command_reply_error(conn, "invalid basis");
1548 if (ovs_scan(mac_s, ETH_ADDR_SCAN_FMT, ETH_ADDR_SCAN_ARGS(mac))) {
1549 hash = bond_hash_src(mac, vlan, basis) & BOND_MASK;
1551 hash_cstr = xasprintf("%u", hash);
1552 unixctl_command_reply(conn, hash_cstr);
1555 unixctl_command_reply_error(conn, "invalid mac");
1562 unixctl_command_register("bond/list", "", 0, 0, bond_unixctl_list, NULL);
1563 unixctl_command_register("bond/show", "[port]", 0, 1, bond_unixctl_show,
1565 unixctl_command_register("bond/migrate", "port hash slave", 3, 3,
1566 bond_unixctl_migrate, NULL);
1567 unixctl_command_register("bond/set-active-slave", "port slave", 2, 2,
1568 bond_unixctl_set_active_slave, NULL);
1569 unixctl_command_register("bond/enable-slave", "port slave", 2, 2,
1570 bond_unixctl_enable_slave, NULL);
1571 unixctl_command_register("bond/disable-slave", "port slave", 2, 2,
1572 bond_unixctl_disable_slave, NULL);
1573 unixctl_command_register("bond/hash", "mac [vlan] [basis]", 1, 3,
1574 bond_unixctl_hash, NULL);
1578 bond_entry_reset(struct bond *bond)
1580 if (bond->balance != BM_AB) {
1581 size_t hash_len = BOND_BUCKETS * sizeof *bond->hash;
1584 bond->hash = xmalloc(hash_len);
1586 memset(bond->hash, 0, hash_len);
1588 bond->next_rebalance = time_msec() + bond->rebalance_interval;
1595 static struct bond_slave *
1596 bond_slave_lookup(struct bond *bond, const void *slave_)
1598 struct bond_slave *slave;
1600 HMAP_FOR_EACH_IN_BUCKET (slave, hmap_node, hash_pointer(slave_, 0),
1602 if (slave->aux == slave_) {
1611 bond_enable_slave(struct bond_slave *slave, bool enable)
1613 slave->delay_expires = LLONG_MAX;
1614 if (enable != slave->enabled) {
1615 slave->bond->bond_revalidate = true;
1616 slave->enabled = enable;
1618 ovs_mutex_lock(&slave->bond->mutex);
1620 list_insert(&slave->bond->enabled_slaves, &slave->list_node);
1622 list_remove(&slave->list_node);
1624 ovs_mutex_unlock(&slave->bond->mutex);
1626 VLOG_INFO("interface %s: %s", slave->name,
1627 slave->enabled ? "enabled" : "disabled");
1632 bond_link_status_update(struct bond_slave *slave)
1634 struct bond *bond = slave->bond;
1637 up = netdev_get_carrier(slave->netdev) && slave->may_enable;
1638 if ((up == slave->enabled) != (slave->delay_expires == LLONG_MAX)) {
1639 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 20);
1640 VLOG_INFO_RL(&rl, "interface %s: link state %s",
1641 slave->name, up ? "up" : "down");
1642 if (up == slave->enabled) {
1643 slave->delay_expires = LLONG_MAX;
1644 VLOG_INFO_RL(&rl, "interface %s: will not be %s",
1645 slave->name, up ? "disabled" : "enabled");
1647 int delay = (bond->lacp_status != LACP_DISABLED ? 0
1648 : up ? bond->updelay : bond->downdelay);
1649 slave->delay_expires = time_msec() + delay;
1651 VLOG_INFO_RL(&rl, "interface %s: will be %s if it stays %s "
1654 up ? "enabled" : "disabled",
1661 if (time_msec() >= slave->delay_expires) {
1662 bond_enable_slave(slave, up);
1667 bond_hash_src(const uint8_t mac[ETH_ADDR_LEN], uint16_t vlan, uint32_t basis)
1669 return hash_mac(mac, vlan, basis);
1673 bond_hash_tcp(const struct flow *flow, uint16_t vlan, uint32_t basis)
1675 struct flow hash_flow = *flow;
1676 hash_flow.vlan_tci = htons(vlan);
1678 /* The symmetric quality of this hash function is not required, but
1679 * flow_hash_symmetric_l4 already exists, and is sufficient for our
1680 * purposes, so we use it out of convenience. */
1681 return flow_hash_symmetric_l4(&hash_flow, basis);
1685 bond_hash(const struct bond *bond, const struct flow *flow, uint16_t vlan)
1687 ovs_assert(bond->balance == BM_TCP || bond->balance == BM_SLB);
1689 return (bond->balance == BM_TCP
1690 ? bond_hash_tcp(flow, vlan, bond->basis)
1691 : bond_hash_src(flow->dl_src, vlan, bond->basis));
1694 static struct bond_entry *
1695 lookup_bond_entry(const struct bond *bond, const struct flow *flow,
1698 return &bond->hash[bond_hash(bond, flow, vlan) & BOND_MASK];
1701 /* Selects and returns an enabled slave from the 'enabled_slaves' list
1702 * in a round-robin fashion. If the 'enabled_slaves' list is empty,
1704 static struct bond_slave *
1705 get_enabled_slave(struct bond *bond)
1709 ovs_mutex_lock(&bond->mutex);
1710 if (list_is_empty(&bond->enabled_slaves)) {
1711 ovs_mutex_unlock(&bond->mutex);
1715 node = list_pop_front(&bond->enabled_slaves);
1716 list_push_back(&bond->enabled_slaves, node);
1717 ovs_mutex_unlock(&bond->mutex);
1719 return CONTAINER_OF(node, struct bond_slave, list_node);
1722 static struct bond_slave *
1723 choose_output_slave(const struct bond *bond, const struct flow *flow,
1724 struct flow_wildcards *wc, uint16_t vlan)
1726 struct bond_entry *e;
1729 balance = bond->balance;
1730 if (bond->lacp_status == LACP_CONFIGURED) {
1731 /* LACP has been configured on this bond but negotiations were
1732 * unsuccussful. If lacp_fallback_ab is enabled use active-
1733 * backup mode else drop all traffic. */
1734 if (!bond->lacp_fallback_ab) {
1742 return bond->active_slave;
1745 if (bond->lacp_status != LACP_NEGOTIATED) {
1746 /* Must have LACP negotiations for TCP balanced bonds. */
1750 flow_mask_hash_fields(flow, wc, NX_HASH_FIELDS_SYMMETRIC_L4);
1755 flow_mask_hash_fields(flow, wc, NX_HASH_FIELDS_ETH_SRC);
1757 e = lookup_bond_entry(bond, flow, vlan);
1758 if (!e->slave || !e->slave->enabled) {
1759 e->slave = get_enabled_slave(CONST_CAST(struct bond*, bond));
1768 static struct bond_slave *
1769 bond_choose_slave(const struct bond *bond)
1771 struct bond_slave *slave, *best;
1773 /* Find an enabled slave. */
1774 HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) {
1775 if (slave->enabled) {
1780 /* All interfaces are disabled. Find an interface that will be enabled
1781 * after its updelay expires. */
1783 HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) {
1784 if (slave->delay_expires != LLONG_MAX
1785 && slave->may_enable
1786 && (!best || slave->delay_expires < best->delay_expires)) {
1794 bond_choose_active_slave(struct bond *bond)
1796 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 20);
1797 struct bond_slave *old_active_slave = bond->active_slave;
1799 bond->active_slave = bond_choose_slave(bond);
1800 if (bond->active_slave) {
1801 if (bond->active_slave->enabled) {
1802 VLOG_INFO_RL(&rl, "bond %s: active interface is now %s",
1803 bond->name, bond->active_slave->name);
1805 VLOG_INFO_RL(&rl, "bond %s: active interface is now %s, skipping "
1806 "remaining %lld ms updelay (since no interface was "
1807 "enabled)", bond->name, bond->active_slave->name,
1808 bond->active_slave->delay_expires - time_msec());
1809 bond_enable_slave(bond->active_slave, true);
1812 bond->send_learning_packets = true;
1813 } else if (old_active_slave) {
1814 VLOG_INFO_RL(&rl, "bond %s: all interfaces disabled", bond->name);
1818 /* Attempts to make the sum of the bond slaves' statistics appear on the fake
1819 * bond interface. */
1821 bond_update_fake_slave_stats(struct bond *bond)
1823 struct netdev_stats bond_stats;
1824 struct bond_slave *slave;
1825 struct netdev *bond_dev;
1827 memset(&bond_stats, 0, sizeof bond_stats);
1829 HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) {
1830 struct netdev_stats slave_stats;
1832 if (!netdev_get_stats(slave->netdev, &slave_stats)) {
1833 /* XXX: We swap the stats here because they are swapped back when
1834 * reported by the internal device. The reason for this is
1835 * internal devices normally represent packets going into the
1836 * system but when used as fake bond device they represent packets
1837 * leaving the system. We really should do this in the internal
1838 * device itself because changing it here reverses the counts from
1839 * the perspective of the switch. However, the internal device
1840 * doesn't know what type of device it represents so we have to do
1841 * it here for now. */
1842 bond_stats.tx_packets += slave_stats.rx_packets;
1843 bond_stats.tx_bytes += slave_stats.rx_bytes;
1844 bond_stats.rx_packets += slave_stats.tx_packets;
1845 bond_stats.rx_bytes += slave_stats.tx_bytes;
1849 if (!netdev_open(bond->name, "system", &bond_dev)) {
1850 netdev_set_stats(bond_dev, &bond_stats);
1851 netdev_close(bond_dev);