+++ /dev/null
-/*
- * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013 Nicira, Inc.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at:
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#include <config.h>
-
-#include "bond.h"
-
-#include <limits.h>
-#include <stdint.h>
-#include <stdlib.h>
-#include <math.h>
-
-#include "coverage.h"
-#include "dynamic-string.h"
-#include "flow.h"
-#include "hmap.h"
-#include "lacp.h"
-#include "list.h"
-#include "netdev.h"
-#include "odp-util.h"
-#include "ofpbuf.h"
-#include "packets.h"
-#include "poll-loop.h"
-#include "shash.h"
-#include "timeval.h"
-#include "unixctl.h"
-#include "vlog.h"
-
-VLOG_DEFINE_THIS_MODULE(bond);
-
-/* Bit-mask for hashing a flow down to a bucket.
- * There are (BOND_MASK + 1) buckets. */
-#define BOND_MASK 0xff
-
-/* A hash bucket for mapping a flow to a slave.
- * "struct bond" has an array of (BOND_MASK + 1) of these. */
-struct bond_entry {
- struct bond_slave *slave; /* Assigned slave, NULL if unassigned. */
- uint64_t tx_bytes; /* Count of bytes recently transmitted. */
- struct list list_node; /* In bond_slave's 'entries' list. */
-};
-
-/* A bond slave, that is, one of the links comprising a bond. */
-struct bond_slave {
- struct hmap_node hmap_node; /* In struct bond's slaves hmap. */
- struct bond *bond; /* The bond that contains this slave. */
- void *aux; /* Client-provided handle for this slave. */
-
- struct netdev *netdev; /* Network device, owned by the client. */
- unsigned int change_seq; /* Tracks changes in 'netdev'. */
- char *name; /* Name (a copy of netdev_get_name(netdev)). */
-
- /* Link status. */
- long long delay_expires; /* Time after which 'enabled' may change. */
- bool enabled; /* May be chosen for flows? */
- bool may_enable; /* Client considers this slave bondable. */
-
- /* Rebalancing info. Used only by bond_rebalance(). */
- struct list bal_node; /* In bond_rebalance()'s 'bals' list. */
- struct list entries; /* 'struct bond_entry's assigned here. */
- uint64_t tx_bytes; /* Sum across 'tx_bytes' of entries. */
-};
-
-/* A bond, that is, a set of network devices grouped to improve performance or
- * robustness. */
-struct bond {
- struct hmap_node hmap_node; /* In 'all_bonds' hmap. */
- char *name; /* Name provided by client. */
-
- /* Slaves. */
- struct hmap slaves;
-
- /* Bonding info. */
- enum bond_mode balance; /* Balancing mode, one of BM_*. */
- struct bond_slave *active_slave;
- int updelay, downdelay; /* Delay before slave goes up/down, in ms. */
- enum lacp_status lacp_status; /* Status of LACP negotiations. */
- bool bond_revalidate; /* True if flows need revalidation. */
- uint32_t basis; /* Basis for flow hash function. */
-
- /* SLB specific bonding info. */
- struct bond_entry *hash; /* An array of (BOND_MASK + 1) elements. */
- int rebalance_interval; /* Interval between rebalances, in ms. */
- long long int next_rebalance; /* Next rebalancing time. */
- bool send_learning_packets;
-
- /* Legacy compatibility. */
- long long int next_fake_iface_update; /* LLONG_MAX if disabled. */
- bool lacp_fallback_ab; /* Fallback to active-backup on LACP failure. */
-
- atomic_int ref_cnt;
-};
-
-static struct ovs_rwlock rwlock = OVS_RWLOCK_INITIALIZER;
-static struct hmap all_bonds__ = HMAP_INITIALIZER(&all_bonds__);
-static struct hmap *const all_bonds OVS_GUARDED_BY(rwlock) = &all_bonds__;
-
-static void bond_entry_reset(struct bond *) OVS_REQ_WRLOCK(rwlock);
-static struct bond_slave *bond_slave_lookup(struct bond *, const void *slave_)
- OVS_REQ_RDLOCK(rwlock);
-static void bond_enable_slave(struct bond_slave *, bool enable)
- OVS_REQ_WRLOCK(rwlock);
-static void bond_link_status_update(struct bond_slave *)
- OVS_REQ_WRLOCK(rwlock);
-static void bond_choose_active_slave(struct bond *)
- OVS_REQ_WRLOCK(rwlock);;
-static unsigned int bond_hash_src(const uint8_t mac[ETH_ADDR_LEN],
- uint16_t vlan, uint32_t basis);
-static unsigned int bond_hash_tcp(const struct flow *, uint16_t vlan,
- uint32_t basis);
-static struct bond_entry *lookup_bond_entry(const struct bond *,
- const struct flow *,
- uint16_t vlan)
- OVS_REQ_RDLOCK(rwlock);
-static struct bond_slave *choose_output_slave(const struct bond *,
- const struct flow *,
- struct flow_wildcards *,
- uint16_t vlan)
- OVS_REQ_RDLOCK(rwlock);
-static void bond_update_fake_slave_stats(struct bond *)
- OVS_REQ_RDLOCK(rwlock);
-
-/* Attempts to parse 's' as the name of a bond balancing mode. If successful,
- * stores the mode in '*balance' and returns true. Otherwise returns false
- * without modifying '*balance'. */
-bool
-bond_mode_from_string(enum bond_mode *balance, const char *s)
-{
- if (!strcmp(s, bond_mode_to_string(BM_TCP))) {
- *balance = BM_TCP;
- } else if (!strcmp(s, bond_mode_to_string(BM_SLB))) {
- *balance = BM_SLB;
- } else if (!strcmp(s, bond_mode_to_string(BM_AB))) {
- *balance = BM_AB;
- } else {
- return false;
- }
- return true;
-}
-
-/* Returns a string representing 'balance'. */
-const char *
-bond_mode_to_string(enum bond_mode balance) {
- switch (balance) {
- case BM_TCP:
- return "balance-tcp";
- case BM_SLB:
- return "balance-slb";
- case BM_AB:
- return "active-backup";
- }
- NOT_REACHED();
-}
-
-\f
-/* Creates and returns a new bond whose configuration is initially taken from
- * 's'.
- *
- * The caller should register each slave on the new bond by calling
- * bond_slave_register(). */
-struct bond *
-bond_create(const struct bond_settings *s)
-{
- struct bond *bond;
-
- bond = xzalloc(sizeof *bond);
- hmap_init(&bond->slaves);
- bond->next_fake_iface_update = LLONG_MAX;
- atomic_init(&bond->ref_cnt, 1);
-
- bond_reconfigure(bond, s);
- return bond;
-}
-
-struct bond *
-bond_ref(const struct bond *bond_)
-{
- struct bond *bond = CONST_CAST(struct bond *, bond_);
-
- if (bond) {
- int orig;
- atomic_add(&bond->ref_cnt, 1, &orig);
- ovs_assert(orig > 0);
- }
- return bond;
-}
-
-/* Frees 'bond'. */
-void
-bond_unref(struct bond *bond)
-{
- struct bond_slave *slave, *next_slave;
- int orig;
-
- if (!bond) {
- return;
- }
-
- atomic_sub(&bond->ref_cnt, 1, &orig);
- ovs_assert(orig > 0);
- if (orig != 1) {
- return;
- }
-
- ovs_rwlock_wrlock(&rwlock);
- hmap_remove(all_bonds, &bond->hmap_node);
- ovs_rwlock_unlock(&rwlock);
-
- HMAP_FOR_EACH_SAFE (slave, next_slave, hmap_node, &bond->slaves) {
- hmap_remove(&bond->slaves, &slave->hmap_node);
- /* Client owns 'slave->netdev'. */
- free(slave->name);
- free(slave);
- }
- hmap_destroy(&bond->slaves);
-
- free(bond->hash);
- free(bond->name);
- free(bond);
-}
-
-/* Updates 'bond''s overall configuration to 's'.
- *
- * The caller should register each slave on 'bond' by calling
- * bond_slave_register(). This is optional if none of the slaves'
- * configuration has changed. In any case it can't hurt.
- *
- * Returns true if the configuration has changed in such a way that requires
- * flow revalidation.
- * */
-bool
-bond_reconfigure(struct bond *bond, const struct bond_settings *s)
-{
- bool revalidate = false;
-
- ovs_rwlock_wrlock(&rwlock);
- if (!bond->name || strcmp(bond->name, s->name)) {
- if (bond->name) {
- hmap_remove(all_bonds, &bond->hmap_node);
- free(bond->name);
- }
- bond->name = xstrdup(s->name);
- hmap_insert(all_bonds, &bond->hmap_node, hash_string(bond->name, 0));
- }
-
- bond->updelay = s->up_delay;
- bond->downdelay = s->down_delay;
-
- if (bond->lacp_fallback_ab != s->lacp_fallback_ab_cfg) {
- bond->lacp_fallback_ab = s->lacp_fallback_ab_cfg;
- revalidate = true;
- }
-
- if (bond->rebalance_interval != s->rebalance_interval) {
- bond->rebalance_interval = s->rebalance_interval;
- revalidate = true;
- }
-
- if (bond->balance != s->balance) {
- bond->balance = s->balance;
- revalidate = true;
- }
-
- if (bond->basis != s->basis) {
- bond->basis = s->basis;
- revalidate = true;
- }
-
- if (s->fake_iface) {
- if (bond->next_fake_iface_update == LLONG_MAX) {
- bond->next_fake_iface_update = time_msec();
- }
- } else {
- bond->next_fake_iface_update = LLONG_MAX;
- }
-
- if (bond->bond_revalidate) {
- revalidate = true;
- bond->bond_revalidate = false;
- }
-
- if (bond->balance == BM_AB || !bond->hash || revalidate) {
- bond_entry_reset(bond);
- }
-
- ovs_rwlock_unlock(&rwlock);
- return revalidate;
-}
-
-static void
-bond_slave_set_netdev__(struct bond_slave *slave, struct netdev *netdev)
- OVS_REQ_WRLOCK(rwlock)
-{
- if (slave->netdev != netdev) {
- slave->netdev = netdev;
- slave->change_seq = 0;
- }
-}
-
-/* Registers 'slave_' as a slave of 'bond'. The 'slave_' pointer is an
- * arbitrary client-provided pointer that uniquely identifies a slave within a
- * bond. If 'slave_' already exists within 'bond' then this function
- * reconfigures the existing slave.
- *
- * 'netdev' must be the network device that 'slave_' represents. It is owned
- * by the client, so the client must not close it before either unregistering
- * 'slave_' or destroying 'bond'.
- */
-void
-bond_slave_register(struct bond *bond, void *slave_, struct netdev *netdev)
-{
- struct bond_slave *slave;
-
- ovs_rwlock_wrlock(&rwlock);
- slave = bond_slave_lookup(bond, slave_);
- if (!slave) {
- slave = xzalloc(sizeof *slave);
-
- hmap_insert(&bond->slaves, &slave->hmap_node, hash_pointer(slave_, 0));
- slave->bond = bond;
- slave->aux = slave_;
- slave->delay_expires = LLONG_MAX;
- slave->name = xstrdup(netdev_get_name(netdev));
- bond->bond_revalidate = true;
-
- slave->enabled = false;
- bond_enable_slave(slave, netdev_get_carrier(netdev));
- }
-
- bond_slave_set_netdev__(slave, netdev);
-
- free(slave->name);
- slave->name = xstrdup(netdev_get_name(netdev));
- ovs_rwlock_unlock(&rwlock);
-}
-
-/* Updates the network device to be used with 'slave_' to 'netdev'.
- *
- * This is useful if the caller closes and re-opens the network device
- * registered with bond_slave_register() but doesn't need to change anything
- * else. */
-void
-bond_slave_set_netdev(struct bond *bond, void *slave_, struct netdev *netdev)
-{
- struct bond_slave *slave;
-
- ovs_rwlock_wrlock(&rwlock);
- slave = bond_slave_lookup(bond, slave_);
- if (slave) {
- bond_slave_set_netdev__(slave, netdev);
- }
- ovs_rwlock_unlock(&rwlock);
-}
-
-/* Unregisters 'slave_' from 'bond'. If 'bond' does not contain such a slave
- * then this function has no effect.
- *
- * Unregistering a slave invalidates all flows. */
-void
-bond_slave_unregister(struct bond *bond, const void *slave_)
-{
- struct bond_slave *slave;
- bool del_active;
-
- ovs_rwlock_wrlock(&rwlock);
- slave = bond_slave_lookup(bond, slave_);
- if (!slave) {
- goto out;
- }
-
- bond->bond_revalidate = true;
- bond_enable_slave(slave, false);
-
- del_active = bond->active_slave == slave;
- if (bond->hash) {
- struct bond_entry *e;
- for (e = bond->hash; e <= &bond->hash[BOND_MASK]; e++) {
- if (e->slave == slave) {
- e->slave = NULL;
- }
- }
- }
-
- free(slave->name);
-
- hmap_remove(&bond->slaves, &slave->hmap_node);
- /* Client owns 'slave->netdev'. */
- free(slave);
-
- if (del_active) {
- bond_choose_active_slave(bond);
- bond->send_learning_packets = true;
- }
-out:
- ovs_rwlock_unlock(&rwlock);
-}
-
-/* Should be called on each slave in 'bond' before bond_run() to indicate
- * whether or not 'slave_' may be enabled. This function is intended to allow
- * other protocols to have some impact on bonding decisions. For example LACP
- * or high level link monitoring protocols may decide that a given slave should
- * not be able to send traffic. */
-void
-bond_slave_set_may_enable(struct bond *bond, void *slave_, bool may_enable)
-{
- ovs_rwlock_wrlock(&rwlock);
- bond_slave_lookup(bond, slave_)->may_enable = may_enable;
- ovs_rwlock_unlock(&rwlock);
-}
-
-/* Performs periodic maintenance on 'bond'.
- *
- * Returns true if the caller should revalidate its flows.
- *
- * The caller should check bond_should_send_learning_packets() afterward. */
-bool
-bond_run(struct bond *bond, enum lacp_status lacp_status)
-{
- struct bond_slave *slave;
- bool revalidate;
-
- ovs_rwlock_wrlock(&rwlock);
- if (bond->lacp_status != lacp_status) {
- bond->lacp_status = lacp_status;
- bond->bond_revalidate = true;
- }
-
- /* Enable slaves based on link status and LACP feedback. */
- HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) {
- bond_link_status_update(slave);
- slave->change_seq = netdev_change_seq(slave->netdev);
- }
- if (!bond->active_slave || !bond->active_slave->enabled) {
- bond_choose_active_slave(bond);
- }
-
- /* Update fake bond interface stats. */
- if (time_msec() >= bond->next_fake_iface_update) {
- bond_update_fake_slave_stats(bond);
- bond->next_fake_iface_update = time_msec() + 1000;
- }
-
- revalidate = bond->bond_revalidate;
- bond->bond_revalidate = false;
- ovs_rwlock_unlock(&rwlock);
-
- return revalidate;
-}
-
-/* Causes poll_block() to wake up when 'bond' needs something to be done. */
-void
-bond_wait(struct bond *bond)
-{
- struct bond_slave *slave;
-
- ovs_rwlock_rdlock(&rwlock);
- HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) {
- if (slave->delay_expires != LLONG_MAX) {
- poll_timer_wait_until(slave->delay_expires);
- }
-
- if (slave->change_seq != netdev_change_seq(slave->netdev)) {
- poll_immediate_wake();
- }
- }
-
- if (bond->next_fake_iface_update != LLONG_MAX) {
- poll_timer_wait_until(bond->next_fake_iface_update);
- }
-
- if (bond->bond_revalidate) {
- poll_immediate_wake();
- }
- ovs_rwlock_unlock(&rwlock);
-
- /* We don't wait for bond->next_rebalance because rebalancing can only run
- * at a flow account checkpoint. ofproto does checkpointing on its own
- * schedule and bond_rebalance() gets called afterward, so we'd just be
- * waking up for no purpose. */
-}
-\f
-/* MAC learning table interaction. */
-
-static bool
-may_send_learning_packets(const struct bond *bond)
-{
- return ((bond->lacp_status == LACP_DISABLED
- && (bond->balance == BM_SLB || bond->balance == BM_AB))
- || (bond->lacp_fallback_ab && bond->lacp_status == LACP_CONFIGURED))
- && bond->active_slave;
-}
-
-/* Returns true if 'bond' needs the client to send out packets to assist with
- * MAC learning on 'bond'. If this function returns true, then the client
- * should iterate through its MAC learning table for the bridge on which 'bond'
- * is located. For each MAC that has been learned on a port other than 'bond',
- * it should call bond_compose_learning_packet().
- *
- * This function will only return true if 'bond' is in SLB or active-backup
- * mode and LACP is not negotiated. Otherwise sending learning packets isn't
- * necessary.
- *
- * Calling this function resets the state that it checks. */
-bool
-bond_should_send_learning_packets(struct bond *bond)
-{
- bool send;
-
- ovs_rwlock_wrlock(&rwlock);
- send = bond->send_learning_packets && may_send_learning_packets(bond);
- bond->send_learning_packets = false;
- ovs_rwlock_unlock(&rwlock);
- return send;
-}
-
-/* Sends a gratuitous learning packet on 'bond' from 'eth_src' on 'vlan'.
- *
- * See bond_should_send_learning_packets() for description of usage. The
- * caller should send the composed packet on the port associated with
- * port_aux and takes ownership of the returned ofpbuf. */
-struct ofpbuf *
-bond_compose_learning_packet(struct bond *bond,
- const uint8_t eth_src[ETH_ADDR_LEN],
- uint16_t vlan, void **port_aux)
-{
- struct bond_slave *slave;
- struct ofpbuf *packet;
- struct flow flow;
-
- ovs_rwlock_rdlock(&rwlock);
- ovs_assert(may_send_learning_packets(bond));
- memset(&flow, 0, sizeof flow);
- memcpy(flow.dl_src, eth_src, ETH_ADDR_LEN);
- slave = choose_output_slave(bond, &flow, NULL, vlan);
-
- packet = ofpbuf_new(0);
- compose_rarp(packet, eth_src);
- if (vlan) {
- eth_push_vlan(packet, htons(vlan));
- }
-
- *port_aux = slave->aux;
- ovs_rwlock_unlock(&rwlock);
- return packet;
-}
-\f
-/* Checks whether a packet that arrived on 'slave_' within 'bond', with an
- * Ethernet destination address of 'eth_dst', should be admitted.
- *
- * The return value is one of the following:
- *
- * - BV_ACCEPT: Admit the packet.
- *
- * - BV_DROP: Drop the packet.
- *
- * - BV_DROP_IF_MOVED: Consult the MAC learning table for the packet's
- * Ethernet source address and VLAN. If there is none, or if the packet
- * is on the learned port, then admit the packet. If a different port has
- * been learned, however, drop the packet (and do not use it for MAC
- * learning).
- */
-enum bond_verdict
-bond_check_admissibility(struct bond *bond, const void *slave_,
- const uint8_t eth_dst[ETH_ADDR_LEN])
-{
- enum bond_verdict verdict = BV_DROP;
- struct bond_slave *slave;
-
- ovs_rwlock_rdlock(&rwlock);
- slave = bond_slave_lookup(bond, slave_);
- if (!slave) {
- goto out;
- }
-
- /* LACP bonds have very loose admissibility restrictions because we can
- * assume the remote switch is aware of the bond and will "do the right
- * thing". However, as a precaution we drop packets on disabled slaves
- * because no correctly implemented partner switch should be sending
- * packets to them.
- *
- * If LACP is configured, but LACP negotiations have been unsuccessful, we
- * drop all incoming traffic except if lacp_fallback_ab is enabled. */
- switch (bond->lacp_status) {
- case LACP_NEGOTIATED:
- verdict = slave->enabled ? BV_ACCEPT : BV_DROP;
- goto out;
- case LACP_CONFIGURED:
- if (!bond->lacp_fallback_ab) {
- goto out;
- }
- case LACP_DISABLED:
- break;
- }
-
- /* Drop all multicast packets on inactive slaves. */
- if (eth_addr_is_multicast(eth_dst)) {
- if (bond->active_slave != slave) {
- goto out;
- }
- }
-
- switch (bond->balance) {
- case BM_TCP:
- /* TCP balanced bonds require successful LACP negotiations. Based on the
- * above check, LACP is off or lacp_fallback_ab is true on this bond.
- * If lacp_fallback_ab is true fall through to BM_AB case else, we
- * drop all incoming traffic. */
- if (!bond->lacp_fallback_ab) {
- goto out;
- }
-
- case BM_AB:
- /* Drop all packets which arrive on backup slaves. This is similar to
- * how Linux bonding handles active-backup bonds. */
- if (bond->active_slave != slave) {
- static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
-
- VLOG_DBG_RL(&rl, "active-backup bond received packet on backup"
- " slave (%s) destined for " ETH_ADDR_FMT,
- slave->name, ETH_ADDR_ARGS(eth_dst));
- goto out;
- }
- verdict = BV_ACCEPT;
- goto out;
-
- case BM_SLB:
- /* Drop all packets for which we have learned a different input port,
- * because we probably sent the packet on one slave and got it back on
- * the other. Gratuitous ARP packets are an exception to this rule:
- * the host has moved to another switch. The exception to the
- * exception is if we locked the learning table to avoid reflections on
- * bond slaves. */
- verdict = BV_DROP_IF_MOVED;
- goto out;
- }
-
- NOT_REACHED();
-out:
- ovs_rwlock_unlock(&rwlock);
- return verdict;
-
-}
-
-/* Returns the slave (registered on 'bond' by bond_slave_register()) to which
- * a packet with the given 'flow' and 'vlan' should be forwarded. Returns
- * NULL if the packet should be dropped because no slaves are enabled.
- *
- * 'vlan' is not necessarily the same as 'flow->vlan_tci'. First, 'vlan'
- * should be a VID only (i.e. excluding the PCP bits). Second,
- * 'flow->vlan_tci' is the VLAN TCI that appeared on the packet (so it will be
- * nonzero only for trunk ports), whereas 'vlan' is the logical VLAN that the
- * packet belongs to (so for an access port it will be the access port's VLAN).
- *
- * If 'wc' is non-NULL, bitwise-OR's 'wc' with the set of bits that were
- * significant in the selection. At some point earlier, 'wc' should
- * have been initialized (e.g., by flow_wildcards_init_catchall()).
- */
-void *
-bond_choose_output_slave(struct bond *bond, const struct flow *flow,
- struct flow_wildcards *wc, uint16_t vlan)
-{
- struct bond_slave *slave;
- void *aux;
-
- ovs_rwlock_rdlock(&rwlock);
- slave = choose_output_slave(bond, flow, wc, vlan);
- aux = slave ? slave->aux : NULL;
- ovs_rwlock_unlock(&rwlock);
-
- return aux;
-}
-\f
-/* Rebalancing. */
-
-static bool
-bond_is_balanced(const struct bond *bond) OVS_REQ_RDLOCK(rwlock)
-{
- return bond->rebalance_interval
- && (bond->balance == BM_SLB || bond->balance == BM_TCP);
-}
-
-/* Notifies 'bond' that 'n_bytes' bytes were sent in 'flow' within 'vlan'. */
-void
-bond_account(struct bond *bond, const struct flow *flow, uint16_t vlan,
- uint64_t n_bytes)
-{
- ovs_rwlock_wrlock(&rwlock);
- if (bond_is_balanced(bond)) {
- lookup_bond_entry(bond, flow, vlan)->tx_bytes += n_bytes;
- }
- ovs_rwlock_unlock(&rwlock);
-}
-
-static struct bond_slave *
-bond_slave_from_bal_node(struct list *bal) OVS_REQ_RDLOCK(rwlock)
-{
- return CONTAINER_OF(bal, struct bond_slave, bal_node);
-}
-
-static void
-log_bals(struct bond *bond, const struct list *bals)
-{
- if (VLOG_IS_DBG_ENABLED()) {
- struct ds ds = DS_EMPTY_INITIALIZER;
- const struct bond_slave *slave;
-
- LIST_FOR_EACH (slave, bal_node, bals) {
- if (ds.length) {
- ds_put_char(&ds, ',');
- }
- ds_put_format(&ds, " %s %"PRIu64"kB",
- slave->name, slave->tx_bytes / 1024);
-
- if (!slave->enabled) {
- ds_put_cstr(&ds, " (disabled)");
- }
- if (!list_is_empty(&slave->entries)) {
- struct bond_entry *e;
-
- ds_put_cstr(&ds, " (");
- LIST_FOR_EACH (e, list_node, &slave->entries) {
- if (&e->list_node != list_front(&slave->entries)) {
- ds_put_cstr(&ds, " + ");
- }
- ds_put_format(&ds, "h%"PRIdPTR": %"PRIu64"kB",
- e - bond->hash, e->tx_bytes / 1024);
- }
- ds_put_cstr(&ds, ")");
- }
- }
- VLOG_DBG("bond %s:%s", bond->name, ds_cstr(&ds));
- ds_destroy(&ds);
- }
-}
-
-/* Shifts 'hash' from its current slave to 'to'. */
-static void
-bond_shift_load(struct bond_entry *hash, struct bond_slave *to)
-{
- struct bond_slave *from = hash->slave;
- struct bond *bond = from->bond;
- uint64_t delta = hash->tx_bytes;
-
- VLOG_INFO("bond %s: shift %"PRIu64"kB of load (with hash %"PRIdPTR") "
- "from %s to %s (now carrying %"PRIu64"kB and "
- "%"PRIu64"kB load, respectively)",
- bond->name, delta / 1024, hash - bond->hash,
- from->name, to->name,
- (from->tx_bytes - delta) / 1024,
- (to->tx_bytes + delta) / 1024);
-
- /* Shift load away from 'from' to 'to'. */
- from->tx_bytes -= delta;
- to->tx_bytes += delta;
-
- /* Arrange for flows to be revalidated. */
- hash->slave = to;
- bond->bond_revalidate = true;
-}
-
-/* Picks and returns a bond_entry to migrate from 'from' (the most heavily
- * loaded bond slave) to a bond slave that has 'to_tx_bytes' bytes of load,
- * given that doing so must decrease the ratio of the load on the two slaves by
- * at least 0.1. Returns NULL if there is no appropriate entry.
- *
- * The list of entries isn't sorted. I don't know of a reason to prefer to
- * shift away small hashes or large hashes. */
-static struct bond_entry *
-choose_entry_to_migrate(const struct bond_slave *from, uint64_t to_tx_bytes)
-{
- struct bond_entry *e;
-
- if (list_is_short(&from->entries)) {
- /* 'from' carries no more than one MAC hash, so shifting load away from
- * it would be pointless. */
- return NULL;
- }
-
- LIST_FOR_EACH (e, list_node, &from->entries) {
- double old_ratio, new_ratio;
- uint64_t delta;
-
- if (to_tx_bytes == 0) {
- /* Nothing on the new slave, move it. */
- return e;
- }
-
- delta = e->tx_bytes;
- old_ratio = (double)from->tx_bytes / to_tx_bytes;
- new_ratio = (double)(from->tx_bytes - delta) / (to_tx_bytes + delta);
- if (old_ratio - new_ratio > 0.1
- && fabs(new_ratio - 1.0) < fabs(old_ratio - 1.0)) {
- /* We're aiming for an ideal ratio of 1, meaning both the 'from'
- and 'to' slave have the same load. Therefore, we only move an
- entry if it decreases the load on 'from', and brings us closer
- to equal traffic load. */
- return e;
- }
- }
-
- return NULL;
-}
-
-/* Inserts 'slave' into 'bals' so that descending order of 'tx_bytes' is
- * maintained. */
-static void
-insert_bal(struct list *bals, struct bond_slave *slave)
-{
- struct bond_slave *pos;
-
- LIST_FOR_EACH (pos, bal_node, bals) {
- if (slave->tx_bytes > pos->tx_bytes) {
- break;
- }
- }
- list_insert(&pos->bal_node, &slave->bal_node);
-}
-
-/* Removes 'slave' from its current list and then inserts it into 'bals' so
- * that descending order of 'tx_bytes' is maintained. */
-static void
-reinsert_bal(struct list *bals, struct bond_slave *slave)
-{
- list_remove(&slave->bal_node);
- insert_bal(bals, slave);
-}
-
-/* If 'bond' needs rebalancing, does so.
- *
- * The caller should have called bond_account() for each active flow, to ensure
- * that flow data is consistently accounted at this point. */
-void
-bond_rebalance(struct bond *bond)
-{
- struct bond_slave *slave;
- struct bond_entry *e;
- struct list bals;
-
- ovs_rwlock_wrlock(&rwlock);
- if (!bond_is_balanced(bond) || time_msec() < bond->next_rebalance) {
- ovs_rwlock_unlock(&rwlock);
- return;
- }
- bond->next_rebalance = time_msec() + bond->rebalance_interval;
-
- /* Add each bond_entry to its slave's 'entries' list.
- * Compute each slave's tx_bytes as the sum of its entries' tx_bytes. */
- HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) {
- slave->tx_bytes = 0;
- list_init(&slave->entries);
- }
- for (e = &bond->hash[0]; e <= &bond->hash[BOND_MASK]; e++) {
- if (e->slave && e->tx_bytes) {
- e->slave->tx_bytes += e->tx_bytes;
- list_push_back(&e->slave->entries, &e->list_node);
- }
- }
-
- /* Add enabled slaves to 'bals' in descending order of tx_bytes.
- *
- * XXX This is O(n**2) in the number of slaves but it could be O(n lg n)
- * with a proper list sort algorithm. */
- list_init(&bals);
- HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) {
- if (slave->enabled) {
- insert_bal(&bals, slave);
- }
- }
- log_bals(bond, &bals);
-
- /* Shift load from the most-loaded slaves to the least-loaded slaves. */
- while (!list_is_short(&bals)) {
- struct bond_slave *from = bond_slave_from_bal_node(list_front(&bals));
- struct bond_slave *to = bond_slave_from_bal_node(list_back(&bals));
- uint64_t overload;
-
- overload = from->tx_bytes - to->tx_bytes;
- if (overload < to->tx_bytes >> 5 || overload < 100000) {
- /* The extra load on 'from' (and all less-loaded slaves), compared
- * to that of 'to' (the least-loaded slave), is less than ~3%, or
- * it is less than ~1Mbps. No point in rebalancing. */
- break;
- }
-
- /* 'from' is carrying significantly more load than 'to'. Pick a hash
- * to move from 'from' to 'to'. */
- e = choose_entry_to_migrate(from, to->tx_bytes);
- if (e) {
- bond_shift_load(e, to);
-
- /* Delete element from from->entries.
- *
- * We don't add the element to to->hashes. That would only allow
- * 'e' to be migrated to another slave in this rebalancing run, and
- * there is no point in doing that. */
- list_remove(&e->list_node);
-
- /* Re-sort 'bals'. */
- reinsert_bal(&bals, from);
- reinsert_bal(&bals, to);
- } else {
- /* Can't usefully migrate anything away from 'from'.
- * Don't reconsider it. */
- list_remove(&from->bal_node);
- }
- }
-
- /* Implement exponentially weighted moving average. A weight of 1/2 causes
- * historical data to decay to <1% in 7 rebalancing runs. 1,000,000 bytes
- * take 20 rebalancing runs to decay to 0 and get deleted entirely. */
- for (e = &bond->hash[0]; e <= &bond->hash[BOND_MASK]; e++) {
- e->tx_bytes /= 2;
- if (!e->tx_bytes) {
- e->slave = NULL;
- }
- }
- ovs_rwlock_unlock(&rwlock);
-}
-\f
-/* Bonding unixctl user interface functions. */
-
-static struct bond *
-bond_find(const char *name) OVS_REQ_RDLOCK(rwlock)
-{
- struct bond *bond;
-
- HMAP_FOR_EACH_WITH_HASH (bond, hmap_node, hash_string(name, 0),
- all_bonds) {
- if (!strcmp(bond->name, name)) {
- return bond;
- }
- }
- return NULL;
-}
-
-static struct bond_slave *
-bond_lookup_slave(struct bond *bond, const char *slave_name)
-{
- struct bond_slave *slave;
-
- HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) {
- if (!strcmp(slave->name, slave_name)) {
- return slave;
- }
- }
- return NULL;
-}
-
-static void
-bond_unixctl_list(struct unixctl_conn *conn,
- int argc OVS_UNUSED, const char *argv[] OVS_UNUSED,
- void *aux OVS_UNUSED)
-{
- struct ds ds = DS_EMPTY_INITIALIZER;
- const struct bond *bond;
-
- ds_put_cstr(&ds, "bond\ttype\tslaves\n");
-
- ovs_rwlock_rdlock(&rwlock);
- HMAP_FOR_EACH (bond, hmap_node, all_bonds) {
- const struct bond_slave *slave;
- size_t i;
-
- ds_put_format(&ds, "%s\t%s\t",
- bond->name, bond_mode_to_string(bond->balance));
-
- i = 0;
- HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) {
- if (i++ > 0) {
- ds_put_cstr(&ds, ", ");
- }
- ds_put_cstr(&ds, slave->name);
- }
- ds_put_char(&ds, '\n');
- }
- ovs_rwlock_unlock(&rwlock);
- unixctl_command_reply(conn, ds_cstr(&ds));
- ds_destroy(&ds);
-}
-
-static void
-bond_print_details(struct ds *ds, const struct bond *bond)
- OVS_REQ_RDLOCK(rwlock)
-{
- struct shash slave_shash = SHASH_INITIALIZER(&slave_shash);
- const struct shash_node **sorted_slaves = NULL;
- const struct bond_slave *slave;
- int i;
-
- ds_put_format(ds, "---- %s ----\n", bond->name);
- ds_put_format(ds, "bond_mode: %s\n",
- bond_mode_to_string(bond->balance));
-
- ds_put_format(ds, "bond-hash-basis: %"PRIu32"\n", bond->basis);
-
- ds_put_format(ds, "updelay: %d ms\n", bond->updelay);
- ds_put_format(ds, "downdelay: %d ms\n", bond->downdelay);
-
- if (bond_is_balanced(bond)) {
- ds_put_format(ds, "next rebalance: %lld ms\n",
- bond->next_rebalance - time_msec());
- }
-
- ds_put_cstr(ds, "lacp_status: ");
- switch (bond->lacp_status) {
- case LACP_NEGOTIATED:
- ds_put_cstr(ds, "negotiated\n");
- break;
- case LACP_CONFIGURED:
- ds_put_cstr(ds, "configured\n");
- break;
- case LACP_DISABLED:
- ds_put_cstr(ds, "off\n");
- break;
- default:
- ds_put_cstr(ds, "<unknown>\n");
- break;
- }
-
- HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) {
- shash_add(&slave_shash, slave->name, slave);
- }
- sorted_slaves = shash_sort(&slave_shash);
-
- for (i = 0; i < shash_count(&slave_shash); i++) {
- struct bond_entry *be;
-
- slave = sorted_slaves[i]->data;
-
- /* Basic info. */
- ds_put_format(ds, "\nslave %s: %s\n",
- slave->name, slave->enabled ? "enabled" : "disabled");
- if (slave == bond->active_slave) {
- ds_put_cstr(ds, "\tactive slave\n");
- }
- if (slave->delay_expires != LLONG_MAX) {
- ds_put_format(ds, "\t%s expires in %lld ms\n",
- slave->enabled ? "downdelay" : "updelay",
- slave->delay_expires - time_msec());
- }
-
- ds_put_format(ds, "\tmay_enable: %s\n",
- slave->may_enable ? "true" : "false");
-
- if (!bond_is_balanced(bond)) {
- continue;
- }
-
- /* Hashes. */
- for (be = bond->hash; be <= &bond->hash[BOND_MASK]; be++) {
- int hash = be - bond->hash;
-
- if (be->slave != slave) {
- continue;
- }
-
- ds_put_format(ds, "\thash %d: %"PRIu64" kB load\n",
- hash, be->tx_bytes / 1024);
-
- /* XXX How can we list the MACs assigned to hashes of SLB bonds? */
- }
- }
- shash_destroy(&slave_shash);
- free(sorted_slaves);
- ds_put_cstr(ds, "\n");
-}
-
-static void
-bond_unixctl_show(struct unixctl_conn *conn,
- int argc, const char *argv[],
- void *aux OVS_UNUSED)
-{
- struct ds ds = DS_EMPTY_INITIALIZER;
-
- ovs_rwlock_rdlock(&rwlock);
- if (argc > 1) {
- const struct bond *bond = bond_find(argv[1]);
-
- if (!bond) {
- unixctl_command_reply_error(conn, "no such bond");
- goto out;
- }
- bond_print_details(&ds, bond);
- } else {
- const struct bond *bond;
-
- HMAP_FOR_EACH (bond, hmap_node, all_bonds) {
- bond_print_details(&ds, bond);
- }
- }
-
- unixctl_command_reply(conn, ds_cstr(&ds));
- ds_destroy(&ds);
-
-out:
- ovs_rwlock_unlock(&rwlock);
-}
-
-static void
-bond_unixctl_migrate(struct unixctl_conn *conn,
- int argc OVS_UNUSED, const char *argv[],
- void *aux OVS_UNUSED)
-{
- const char *bond_s = argv[1];
- const char *hash_s = argv[2];
- const char *slave_s = argv[3];
- struct bond *bond;
- struct bond_slave *slave;
- struct bond_entry *entry;
- int hash;
-
- ovs_rwlock_wrlock(&rwlock);
- bond = bond_find(bond_s);
- if (!bond) {
- unixctl_command_reply_error(conn, "no such bond");
- goto out;
- }
-
- if (bond->balance != BM_SLB) {
- unixctl_command_reply_error(conn, "not an SLB bond");
- goto out;
- }
-
- if (strspn(hash_s, "0123456789") == strlen(hash_s)) {
- hash = atoi(hash_s) & BOND_MASK;
- } else {
- unixctl_command_reply_error(conn, "bad hash");
- goto out;
- }
-
- slave = bond_lookup_slave(bond, slave_s);
- if (!slave) {
- unixctl_command_reply_error(conn, "no such slave");
- goto out;
- }
-
- if (!slave->enabled) {
- unixctl_command_reply_error(conn, "cannot migrate to disabled slave");
- goto out;
- }
-
- entry = &bond->hash[hash];
- bond->bond_revalidate = true;
- entry->slave = slave;
- unixctl_command_reply(conn, "migrated");
-
-out:
- ovs_rwlock_unlock(&rwlock);
-}
-
-static void
-bond_unixctl_set_active_slave(struct unixctl_conn *conn,
- int argc OVS_UNUSED, const char *argv[],
- void *aux OVS_UNUSED)
-{
- const char *bond_s = argv[1];
- const char *slave_s = argv[2];
- struct bond *bond;
- struct bond_slave *slave;
-
- ovs_rwlock_wrlock(&rwlock);
- bond = bond_find(bond_s);
- if (!bond) {
- unixctl_command_reply_error(conn, "no such bond");
- goto out;
- }
-
- slave = bond_lookup_slave(bond, slave_s);
- if (!slave) {
- unixctl_command_reply_error(conn, "no such slave");
- goto out;
- }
-
- if (!slave->enabled) {
- unixctl_command_reply_error(conn, "cannot make disabled slave active");
- goto out;
- }
-
- if (bond->active_slave != slave) {
- bond->bond_revalidate = true;
- bond->active_slave = slave;
- VLOG_INFO("bond %s: active interface is now %s",
- bond->name, slave->name);
- bond->send_learning_packets = true;
- unixctl_command_reply(conn, "done");
- } else {
- unixctl_command_reply(conn, "no change");
- }
-out:
- ovs_rwlock_unlock(&rwlock);
-}
-
-static void
-enable_slave(struct unixctl_conn *conn, const char *argv[], bool enable)
-{
- const char *bond_s = argv[1];
- const char *slave_s = argv[2];
- struct bond *bond;
- struct bond_slave *slave;
-
- ovs_rwlock_wrlock(&rwlock);
- bond = bond_find(bond_s);
- if (!bond) {
- unixctl_command_reply_error(conn, "no such bond");
- goto out;
- }
-
- slave = bond_lookup_slave(bond, slave_s);
- if (!slave) {
- unixctl_command_reply_error(conn, "no such slave");
- goto out;
- }
-
- bond_enable_slave(slave, enable);
- unixctl_command_reply(conn, enable ? "enabled" : "disabled");
-
-out:
- ovs_rwlock_unlock(&rwlock);
-}
-
-static void
-bond_unixctl_enable_slave(struct unixctl_conn *conn,
- int argc OVS_UNUSED, const char *argv[],
- void *aux OVS_UNUSED)
-{
- enable_slave(conn, argv, true);
-}
-
-static void
-bond_unixctl_disable_slave(struct unixctl_conn *conn,
- int argc OVS_UNUSED, const char *argv[],
- void *aux OVS_UNUSED)
-{
- enable_slave(conn, argv, false);
-}
-
-static void
-bond_unixctl_hash(struct unixctl_conn *conn, int argc, const char *argv[],
- void *aux OVS_UNUSED)
-{
- const char *mac_s = argv[1];
- const char *vlan_s = argc > 2 ? argv[2] : NULL;
- const char *basis_s = argc > 3 ? argv[3] : NULL;
- uint8_t mac[ETH_ADDR_LEN];
- uint8_t hash;
- char *hash_cstr;
- unsigned int vlan;
- uint32_t basis;
-
- if (vlan_s) {
- if (!ovs_scan(vlan_s, "%u", &vlan)) {
- unixctl_command_reply_error(conn, "invalid vlan");
- return;
- }
- } else {
- vlan = 0;
- }
-
- if (basis_s) {
- if (!ovs_scan(basis_s, "%"SCNu32, &basis)) {
- unixctl_command_reply_error(conn, "invalid basis");
- return;
- }
- } else {
- basis = 0;
- }
-
- if (ovs_scan(mac_s, ETH_ADDR_SCAN_FMT, ETH_ADDR_SCAN_ARGS(mac))) {
- hash = bond_hash_src(mac, vlan, basis) & BOND_MASK;
-
- hash_cstr = xasprintf("%u", hash);
- unixctl_command_reply(conn, hash_cstr);
- free(hash_cstr);
- } else {
- unixctl_command_reply_error(conn, "invalid mac");
- }
-}
-
-void
-bond_init(void)
-{
- unixctl_command_register("bond/list", "", 0, 0, bond_unixctl_list, NULL);
- unixctl_command_register("bond/show", "[port]", 0, 1, bond_unixctl_show,
- NULL);
- unixctl_command_register("bond/migrate", "port hash slave", 3, 3,
- bond_unixctl_migrate, NULL);
- unixctl_command_register("bond/set-active-slave", "port slave", 2, 2,
- bond_unixctl_set_active_slave, NULL);
- unixctl_command_register("bond/enable-slave", "port slave", 2, 2,
- bond_unixctl_enable_slave, NULL);
- unixctl_command_register("bond/disable-slave", "port slave", 2, 2,
- bond_unixctl_disable_slave, NULL);
- unixctl_command_register("bond/hash", "mac [vlan] [basis]", 1, 3,
- bond_unixctl_hash, NULL);
-}
-\f
-static void
-bond_entry_reset(struct bond *bond)
-{
- if (bond->balance != BM_AB) {
- size_t hash_len = (BOND_MASK + 1) * sizeof *bond->hash;
-
- if (!bond->hash) {
- bond->hash = xmalloc(hash_len);
- }
- memset(bond->hash, 0, hash_len);
-
- bond->next_rebalance = time_msec() + bond->rebalance_interval;
- } else {
- free(bond->hash);
- bond->hash = NULL;
- }
-}
-
-static struct bond_slave *
-bond_slave_lookup(struct bond *bond, const void *slave_)
-{
- struct bond_slave *slave;
-
- HMAP_FOR_EACH_IN_BUCKET (slave, hmap_node, hash_pointer(slave_, 0),
- &bond->slaves) {
- if (slave->aux == slave_) {
- return slave;
- }
- }
-
- return NULL;
-}
-
-static void
-bond_enable_slave(struct bond_slave *slave, bool enable)
-{
- slave->delay_expires = LLONG_MAX;
- if (enable != slave->enabled) {
- slave->bond->bond_revalidate = true;
- slave->enabled = enable;
- VLOG_INFO("interface %s: %s", slave->name,
- slave->enabled ? "enabled" : "disabled");
- }
-}
-
-static void
-bond_link_status_update(struct bond_slave *slave)
-{
- struct bond *bond = slave->bond;
- bool up;
-
- up = netdev_get_carrier(slave->netdev) && slave->may_enable;
- if ((up == slave->enabled) != (slave->delay_expires == LLONG_MAX)) {
- static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 20);
- VLOG_INFO_RL(&rl, "interface %s: link state %s",
- slave->name, up ? "up" : "down");
- if (up == slave->enabled) {
- slave->delay_expires = LLONG_MAX;
- VLOG_INFO_RL(&rl, "interface %s: will not be %s",
- slave->name, up ? "disabled" : "enabled");
- } else {
- int delay = (bond->lacp_status != LACP_DISABLED ? 0
- : up ? bond->updelay : bond->downdelay);
- slave->delay_expires = time_msec() + delay;
- if (delay) {
- VLOG_INFO_RL(&rl, "interface %s: will be %s if it stays %s "
- "for %d ms",
- slave->name,
- up ? "enabled" : "disabled",
- up ? "up" : "down",
- delay);
- }
- }
- }
-
- if (time_msec() >= slave->delay_expires) {
- bond_enable_slave(slave, up);
- }
-}
-
-static unsigned int
-bond_hash_src(const uint8_t mac[ETH_ADDR_LEN], uint16_t vlan, uint32_t basis)
-{
- return hash_3words(hash_bytes(mac, ETH_ADDR_LEN, 0), vlan, basis);
-}
-
-static unsigned int
-bond_hash_tcp(const struct flow *flow, uint16_t vlan, uint32_t basis)
-{
- struct flow hash_flow = *flow;
- hash_flow.vlan_tci = htons(vlan);
-
- /* The symmetric quality of this hash function is not required, but
- * flow_hash_symmetric_l4 already exists, and is sufficient for our
- * purposes, so we use it out of convenience. */
- return flow_hash_symmetric_l4(&hash_flow, basis);
-}
-
-static unsigned int
-bond_hash(const struct bond *bond, const struct flow *flow, uint16_t vlan)
-{
- ovs_assert(bond->balance == BM_TCP || bond->balance == BM_SLB);
-
- return (bond->balance == BM_TCP
- ? bond_hash_tcp(flow, vlan, bond->basis)
- : bond_hash_src(flow->dl_src, vlan, bond->basis));
-}
-
-static struct bond_entry *
-lookup_bond_entry(const struct bond *bond, const struct flow *flow,
- uint16_t vlan)
-{
- return &bond->hash[bond_hash(bond, flow, vlan) & BOND_MASK];
-}
-
-static struct bond_slave *
-choose_output_slave(const struct bond *bond, const struct flow *flow,
- struct flow_wildcards *wc, uint16_t vlan)
-{
- struct bond_entry *e;
- int balance;
-
- balance = bond->balance;
- if (bond->lacp_status == LACP_CONFIGURED) {
- /* LACP has been configured on this bond but negotiations were
- * unsuccussful. If lacp_fallback_ab is enabled use active-
- * backup mode else drop all traffic. */
- if (!bond->lacp_fallback_ab) {
- return NULL;
- }
- balance = BM_AB;
- }
-
- switch (balance) {
- case BM_AB:
- return bond->active_slave;
-
- case BM_TCP:
- if (bond->lacp_status != LACP_NEGOTIATED) {
- /* Must have LACP negotiations for TCP balanced bonds. */
- return NULL;
- }
- if (wc) {
- flow_mask_hash_fields(flow, wc, NX_HASH_FIELDS_SYMMETRIC_L4);
- }
- /* Fall Through. */
- case BM_SLB:
- if (wc) {
- flow_mask_hash_fields(flow, wc, NX_HASH_FIELDS_ETH_SRC);
- }
- e = lookup_bond_entry(bond, flow, vlan);
- if (!e->slave || !e->slave->enabled) {
- e->slave = CONTAINER_OF(hmap_random_node(&bond->slaves),
- struct bond_slave, hmap_node);
- if (!e->slave->enabled) {
- e->slave = bond->active_slave;
- }
- }
- return e->slave;
-
- default:
- NOT_REACHED();
- }
-}
-
-static struct bond_slave *
-bond_choose_slave(const struct bond *bond)
-{
- struct bond_slave *slave, *best;
-
- /* Find an enabled slave. */
- HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) {
- if (slave->enabled) {
- return slave;
- }
- }
-
- /* All interfaces are disabled. Find an interface that will be enabled
- * after its updelay expires. */
- best = NULL;
- HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) {
- if (slave->delay_expires != LLONG_MAX
- && slave->may_enable
- && (!best || slave->delay_expires < best->delay_expires)) {
- best = slave;
- }
- }
- return best;
-}
-
-static void
-bond_choose_active_slave(struct bond *bond)
-{
- static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 20);
- struct bond_slave *old_active_slave = bond->active_slave;
-
- bond->active_slave = bond_choose_slave(bond);
- if (bond->active_slave) {
- if (bond->active_slave->enabled) {
- VLOG_INFO_RL(&rl, "bond %s: active interface is now %s",
- bond->name, bond->active_slave->name);
- } else {
- VLOG_INFO_RL(&rl, "bond %s: active interface is now %s, skipping "
- "remaining %lld ms updelay (since no interface was "
- "enabled)", bond->name, bond->active_slave->name,
- bond->active_slave->delay_expires - time_msec());
- bond_enable_slave(bond->active_slave, true);
- }
-
- bond->send_learning_packets = true;
- } else if (old_active_slave) {
- VLOG_INFO_RL(&rl, "bond %s: all interfaces disabled", bond->name);
- }
-}
-
-/* Attempts to make the sum of the bond slaves' statistics appear on the fake
- * bond interface. */
-static void
-bond_update_fake_slave_stats(struct bond *bond)
-{
- struct netdev_stats bond_stats;
- struct bond_slave *slave;
- struct netdev *bond_dev;
-
- memset(&bond_stats, 0, sizeof bond_stats);
-
- HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) {
- struct netdev_stats slave_stats;
-
- if (!netdev_get_stats(slave->netdev, &slave_stats)) {
- /* XXX: We swap the stats here because they are swapped back when
- * reported by the internal device. The reason for this is
- * internal devices normally represent packets going into the
- * system but when used as fake bond device they represent packets
- * leaving the system. We really should do this in the internal
- * device itself because changing it here reverses the counts from
- * the perspective of the switch. However, the internal device
- * doesn't know what type of device it represents so we have to do
- * it here for now. */
- bond_stats.tx_packets += slave_stats.rx_packets;
- bond_stats.tx_bytes += slave_stats.rx_bytes;
- bond_stats.rx_packets += slave_stats.tx_packets;
- bond_stats.rx_bytes += slave_stats.tx_bytes;
- }
- }
-
- if (!netdev_open(bond->name, "system", &bond_dev)) {
- netdev_set_stats(bond_dev, &bond_stats);
- netdev_close(bond_dev);
- }
-}
git://git.onelab.eu / sliver-openvswitch.git / blobdiff