X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=lib%2Fbond.c;h=4e68fc8654959bbc374127666547d75e4b22f2af;hb=c0a2e71d110ad2af474232e03ea9ad94cbbae46f;hp=343c334b6013dc9704a7e5b703384c57df814b09;hpb=dc9908b3fb496843603227752d2b63709afe82c7;p=openvswitch

diff --git a/lib/bond.c b/lib/bond.c
index 343c334b..4e68fc86 100644
--- a/lib/bond.c
+++ b/lib/bond.c
@@ -26,7 +26,6 @@
 #include "dynamic-string.h"
 #include "flow.h"
 #include "hmap.h"
-#include "lacp.h"
 #include "list.h"
 #include "netdev.h"
 #include "odp-util.h"
@@ -40,8 +39,6 @@
 
 VLOG_DEFINE_THIS_MODULE(bond);
 
-COVERAGE_DEFINE(bond_process_lacp);
-
 /* Bit-mask for hashing a flow down to a bucket.
  * There are (BOND_MASK + 1) buckets. */
 #define BOND_MASK 0xff
@@ -66,14 +63,17 @@ struct bond_slave {
 
     /* Link status. */
     long long delay_expires;    /* Time after which 'enabled' may change. */
-    bool up;                    /* Last link status read from netdev. */
     bool enabled;               /* May be chosen for flows? */
+    bool lacp_may_enable;       /* LACP considers this interface bondable. */
     tag_type tag;               /* Tag associated with this slave. */
 
     /* 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. */
+
+    /* BM_STABLE specific bonding info. */
+    uint32_t stb_id;            /* ID used for 'stb_slaves' ordering. */
 };
 
 /* A bond, that is, a set of network devices grouped to improve performance or
@@ -90,6 +90,9 @@ struct bond {
     struct bond_slave *active_slave;
     tag_type no_slaves_tag;     /* Tag for flows when all slaves disabled. */
     int updelay, downdelay;     /* Delay before slave goes up/down, in ms. */
+    bool lacp_negotiated;       /* LACP negotiations were successful. */
+    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. */
@@ -97,14 +100,11 @@ struct bond {
     long long int next_rebalance; /* Next rebalancing time. */
     bool send_learning_packets;
 
-    /* LACP. */
-    struct lacp *lacp;          /* LACP object. NULL if LACP is disabled. */
+    /* BM_STABLE specific bonding info. */
+    tag_type stb_tag;               /* Tag associated with this bond. */
 
     /* Monitoring. */
-    enum bond_detect_mode detect;     /* Link status mode, one of BLSM_*. */
     struct netdev_monitor *monitor;   /* detect == BLSM_CARRIER only. */
-    long long int miimon_interval;    /* Miimon status refresh interval. */
-    long long int miimon_next_update; /* Time of next miimon update. */
 
     /* Legacy compatibility. */
     long long int next_fake_iface_update; /* LLONG_MAX if disabled. */
@@ -117,16 +117,17 @@ struct bond {
 
 static struct hmap all_bonds = HMAP_INITIALIZER(&all_bonds);
 
+static void bond_entry_reset(struct bond *);
 static struct bond_slave *bond_slave_lookup(struct bond *, const void *slave_);
-static bool bond_is_link_up(struct bond *, struct netdev *);
 static void bond_enable_slave(struct bond_slave *, bool enable,
                               struct tag_set *);
 static void bond_link_status_update(struct bond_slave *, struct tag_set *);
 static void bond_choose_active_slave(struct bond *, struct tag_set *);
 static bool bond_is_tcp_hash(const struct bond *);
 static unsigned int bond_hash_src(const uint8_t mac[ETH_ADDR_LEN],
-                                  uint16_t vlan);
-static unsigned int bond_hash_tcp(const struct flow *, uint16_t vlan);
+                                  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);
@@ -146,6 +147,8 @@ bond_mode_from_string(enum bond_mode *balance, const char *s)
         *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_STABLE))) {
+        *balance = BM_STABLE;
     } else if (!strcmp(s, bond_mode_to_string(BM_AB))) {
         *balance = BM_AB;
     } else {
@@ -162,40 +165,14 @@ bond_mode_to_string(enum bond_mode balance) {
         return "balance-tcp";
     case BM_SLB:
         return "balance-slb";
+    case BM_STABLE:
+        return "stable";
     case BM_AB:
         return "active-backup";
     }
     NOT_REACHED();
 }
 
-/* Attempts to parse 's' as the name of a bond link status detection mode.  If
- * successful, stores the mode in '*detect' and returns true.  Otherwise
- * returns false without modifying '*detect'. */
-bool
-bond_detect_mode_from_string(enum bond_detect_mode *detect, const char *s)
-{
-    if (!strcmp(s, bond_detect_mode_to_string(BLSM_CARRIER))) {
-        *detect = BLSM_CARRIER;
-    } else if (!strcmp(s, bond_detect_mode_to_string(BLSM_MIIMON))) {
-        *detect = BLSM_MIIMON;
-    } else {
-        return false;
-    }
-    return true;
-}
-
-/* Returns a string representing 'detect'. */
-const char *
-bond_detect_mode_to_string(enum bond_detect_mode detect)
-{
-    switch (detect) {
-    case BLSM_CARRIER:
-        return "carrier";
-    case BLSM_MIIMON:
-        return "miimon";
-    }
-    NOT_REACHED();
-}
 
 /* Creates and returns a new bond whose configuration is initially taken from
  * 's'.
@@ -210,8 +187,9 @@ bond_create(const struct bond_settings *s)
     bond = xzalloc(sizeof *bond);
     hmap_init(&bond->slaves);
     bond->no_slaves_tag = tag_create_random();
-    bond->miimon_next_update = LLONG_MAX;
+    bond->stb_tag = tag_create_random();
     bond->next_fake_iface_update = LLONG_MAX;
+    bond->monitor = netdev_monitor_create();
 
     bond_reconfigure(bond, s);
 
@@ -242,8 +220,6 @@ bond_destroy(struct bond *bond)
 
     free(bond->hash);
 
-    lacp_destroy(bond->lacp);
-
     netdev_monitor_destroy(bond->monitor);
 
     free(bond->name);
@@ -254,9 +230,7 @@ bond_destroy(struct bond *bond)
  *
  * The caller should register each slave on 'bond' by calling
  * bond_slave_register().  This is optional if none of the slaves'
- * configuration has changed, except that it is mandatory if 's' enables LACP
- * and 'bond' previously didn't have LACP enabled.  In any case it can't
- * hurt.
+ * 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.
@@ -275,8 +249,6 @@ bond_reconfigure(struct bond *bond, const struct bond_settings *s)
         hmap_insert(&all_bonds, &bond->hmap_node, hash_string(bond->name, 0));
     }
 
-    bond->detect = s->detect;
-    bond->miimon_interval = s->miimon_interval;
     bond->updelay = s->up_delay;
     bond->downdelay = s->down_delay;
     bond->rebalance_interval = s->rebalance_interval;
@@ -286,45 +258,9 @@ bond_reconfigure(struct bond *bond, const struct bond_settings *s)
         revalidate = true;
     }
 
-    if (bond->balance != BM_AB) {
-        if (!bond->hash) {
-            bond->hash = xcalloc(BOND_MASK + 1, sizeof *bond->hash);
-            bond->next_rebalance = time_msec() + bond->rebalance_interval;
-        }
-    } else {
-        if (bond->hash) {
-            free(bond->hash);
-            bond->hash = NULL;
-        }
-    }
-
-    if (bond->detect == BLSM_CARRIER) {
-        struct bond_slave *slave;
-
-        if (!bond->monitor) {
-            bond->monitor = netdev_monitor_create();
-        }
-
-        HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) {
-            netdev_monitor_add(bond->monitor, slave->netdev);
-        }
-    } else {
-        netdev_monitor_destroy(bond->monitor);
-        bond->monitor = NULL;
-
-        if (bond->miimon_next_update == LLONG_MAX) {
-            bond->miimon_next_update = time_msec() + bond->miimon_interval;
-        }
-    }
-
-    if (s->lacp) {
-        if (!bond->lacp) {
-            bond->lacp = lacp_create();
-        }
-        lacp_configure(bond->lacp, s->lacp);
-    } else {
-        lacp_destroy(bond->lacp);
-        bond->lacp = NULL;
+    if (bond->basis != s->basis) {
+        bond->basis = s->basis;
+        revalidate = true;
     }
 
     if (s->fake_iface) {
@@ -335,24 +271,47 @@ bond_reconfigure(struct bond *bond, const struct bond_settings *s)
         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);
+    }
+
     return revalidate;
 }
 
+static void
+bond_slave_set_netdev__(struct bond *bond, struct bond_slave *slave,
+                        struct netdev *netdev)
+{
+    if (slave->netdev != netdev) {
+        if (slave->netdev) {
+            netdev_monitor_remove(bond->monitor, slave->netdev);
+        }
+        netdev_monitor_add(bond->monitor, netdev);
+        slave->netdev = netdev;
+    }
+}
+
 /* 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.
  *
+ * 'stb_id' is used in BM_STABLE bonds to guarantee consistent slave choices
+ * across restarts and distributed vswitch instances.  It should be unique per
+ * slave, and preferably consistent across restarts and reconfigurations.
+ *
  * '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'.
- *
- * If 'bond' has a LACP configuration then 'lacp_settings' must point to LACP
- * settings for 'slave_'; otherwise 'lacp_settings' is ignored.
  */
 void
-bond_slave_register(struct bond *bond, void *slave_, struct netdev *netdev,
-                    const struct lacp_slave_settings *lacp_settings)
+bond_slave_register(struct bond *bond, void *slave_, uint32_t stb_id,
+                    struct netdev *netdev)
 {
     struct bond_slave *slave = bond_slave_lookup(bond, slave_);
 
@@ -363,17 +322,35 @@ bond_slave_register(struct bond *bond, void *slave_, struct netdev *netdev,
         slave->bond = bond;
         slave->aux = slave_;
         slave->delay_expires = LLONG_MAX;
-        slave->up = bond_is_link_up(bond, netdev);
-        slave->enabled = slave->up;
+        slave->name = xstrdup(netdev_get_name(netdev));
+        bond->bond_revalidate = true;
+
+        slave->enabled = false;
+        bond_enable_slave(slave, netdev_get_carrier(netdev), NULL);
     }
 
-    slave->netdev = netdev;
+    if (slave->stb_id != stb_id) {
+        slave->stb_id = stb_id;
+        bond->bond_revalidate = true;
+    }
+
+    bond_slave_set_netdev__(bond, slave, netdev);
+
     free(slave->name);
     slave->name = xstrdup(netdev_get_name(netdev));
+}
 
-    if (bond->lacp) {
-        assert(lacp_settings != NULL);
-        lacp_slave_register(bond->lacp, slave, lacp_settings);
+/* 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 = bond_slave_lookup(bond, slave_);
+    if (slave) {
+        bond_slave_set_netdev__(bond, slave, netdev);
     }
 }
 
@@ -391,6 +368,9 @@ bond_slave_unregister(struct bond *bond, const void *slave_)
         return;
     }
 
+    netdev_monitor_remove(bond->monitor, slave->netdev);
+    bond_enable_slave(slave, false, NULL);
+
     del_active = bond->active_slave == slave;
     if (bond->hash) {
         struct bond_entry *e;
@@ -416,36 +396,13 @@ bond_slave_unregister(struct bond *bond, const void *slave_)
     }
 }
 
-/* Callback for lacp_run(). */
-static void
-bond_send_pdu_cb(void *slave_, const struct lacp_pdu *pdu)
+/* Should be called on each slave in 'bond' before bond_run() to indicate the
+ * results of lacp_slave_may_enable() on 'slave_'. */
+void
+bond_slave_set_lacp_may_enable(struct bond *bond, void *slave_,
+                               bool may_enable)
 {
-    static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 10);
-    struct bond_slave *slave = slave_;
-    uint8_t ea[ETH_ADDR_LEN];
-    int error;
-
-    error = netdev_get_etheraddr(slave->netdev, ea);
-    if (!error) {
-        struct lacp_pdu *packet_pdu;
-        struct ofpbuf packet;
-
-        ofpbuf_init(&packet, 0);
-        packet_pdu = eth_compose(&packet, eth_addr_lacp, ea, ETH_TYPE_LACP,
-                                 sizeof *packet_pdu);
-        *packet_pdu = *pdu;
-        error = netdev_send(slave->netdev, &packet);
-        if (error) {
-            VLOG_WARN_RL(&rl, "bond %s: sending LACP PDU on slave %s failed "
-                         "(%s)",
-                         slave->bond->name, slave->name, strerror(error));
-        }
-        ofpbuf_uninit(&packet);
-    } else {
-        VLOG_ERR_RL(&rl, "bond %s: cannot obtain Ethernet address of slave "
-                    "%s (%s)",
-                    slave->bond->name, slave->name, strerror(error));
-    }
+    bond_slave_lookup(bond, slave_)->lacp_may_enable = may_enable;
 }
 
 /* Performs periodic maintenance on 'bond'.  The caller must provide 'tags' to
@@ -453,28 +410,15 @@ bond_send_pdu_cb(void *slave_, const struct lacp_pdu *pdu)
  *
  * The caller should check bond_should_send_learning_packets() afterward. */
 void
-bond_run(struct bond *bond, struct tag_set *tags)
+bond_run(struct bond *bond, struct tag_set *tags, bool lacp_negotiated)
 {
     struct bond_slave *slave;
     bool is_tcp_hash = bond_is_tcp_hash(bond);
 
-    /* Update link status. */
-    if (bond->detect == BLSM_CARRIER
-        || time_msec() >= bond->miimon_next_update)
-    {
-        HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) {
-            slave->up = bond_is_link_up(bond, slave->netdev);
-        }
-        bond->miimon_next_update = time_msec() + bond->miimon_interval;
-    }
+    bond->lacp_negotiated = lacp_negotiated;
 
-    /* Update LACP. */
-    if (bond->lacp) {
-        HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) {
-            lacp_slave_enable(bond->lacp, slave, slave->enabled);
-        }
-
-        lacp_run(bond->lacp, bond_send_pdu_cb);
+    if (bond->monitor) {
+        netdev_monitor_flush(bond->monitor);
     }
 
     /* Enable slaves based on link status and LACP feedback. */
@@ -492,11 +436,23 @@ bond_run(struct bond *bond, struct tag_set *tags)
     }
 
     if (is_tcp_hash != bond_is_tcp_hash(bond)) {
-        struct bond_slave *slave;
+        bond->bond_revalidate = true;
+    }
 
-        HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) {
-            tag_set_add(tags, slave->tag);
+    if (bond->bond_revalidate) {
+        bond->bond_revalidate = false;
+
+        bond_entry_reset(bond);
+        if (bond->balance != BM_STABLE) {
+            struct bond_slave *slave;
+
+            HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) {
+                tag_set_add(tags, slave->tag);
+            }
+        } else {
+            tag_set_add(tags, bond->stb_tag);
         }
+        tag_set_add(tags, bond->no_slaves_tag);
     }
 
     /* Invalidate any tags required by  */
@@ -510,11 +466,7 @@ bond_wait(struct bond *bond)
 {
     struct bond_slave *slave;
 
-    if (bond->detect == BLSM_CARRIER) {
-        netdev_monitor_poll_wait(bond->monitor);
-    } else {
-        poll_timer_wait_until(bond->miimon_next_update);
-    }
+    netdev_monitor_poll_wait(bond->monitor);
 
     HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) {
         if (slave->delay_expires != LLONG_MAX) {
@@ -542,7 +494,7 @@ bond_wait(struct bond *bond)
 static bool
 may_send_learning_packets(const struct bond *bond)
 {
-    return !lacp_negotiated(bond->lacp) && bond->balance != BM_AB;
+    return !bond->lacp_negotiated && bond->balance != BM_AB;
 }
 
 /* Returns true if 'bond' needs the client to send out packets to assist with
@@ -619,7 +571,7 @@ bond_check_admissibility(struct bond *bond, const void *slave_,
 {
     /* Admit all packets if LACP has been negotiated, because that means that
      * the remote switch is aware of the bond and will "do the right thing". */
-    if (lacp_negotiated(bond->lacp)) {
+    if (bond->lacp_negotiated) {
         return BV_ACCEPT;
     }
 
@@ -657,51 +609,30 @@ bond_choose_output_slave(struct bond *bond, const struct flow *flow,
 {
     struct bond_slave *slave = choose_output_slave(bond, flow, vlan);
     if (slave) {
-        *tags |= slave->tag;
+        *tags |= bond->balance == BM_STABLE ? bond->stb_tag : slave->tag;
         return slave->aux;
     } else {
         *tags |= bond->no_slaves_tag;
         return NULL;
     }
 }
+
+/* Rebalancing. */
 
-/* Processes LACP packet 'packet', which was received on 'slave_' within
- * 'bond'.
- *
- * The client should use this function to pass along LACP messages received on
- * any of 'bond''s slaves. */
-void
-bond_process_lacp(struct bond *bond, void *slave_, const struct ofpbuf *packet)
+static bool
+bond_is_balanced(const struct bond *bond)
 {
-    if (bond->lacp) {
-        struct bond_slave *slave = bond_slave_lookup(bond, slave_);
-        const struct lacp_pdu *pdu = parse_lacp_packet(packet);
-        if (slave && pdu) {
-            COVERAGE_INC(bond_process_lacp);
-            lacp_process_pdu(bond->lacp, slave, pdu);
-        }
-    }
+    return bond->balance == BM_SLB || bond->balance == BM_TCP;
 }
-
-/* Rebalancing. */
 
 /* 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)
 {
-    switch (bond->balance) {
-    case BM_AB:
-        /* Nothing to do. */
-        break;
 
-    case BM_SLB:
-    case BM_TCP:
+    if (bond_is_balanced(bond)) {
         lookup_bond_entry(bond, flow, vlan)->tx_bytes += n_bytes;
-        break;
-
-    default:
-        NOT_REACHED();
     }
 }
 
@@ -847,7 +778,7 @@ bond_rebalance(struct bond *bond, struct tag_set *tags)
     struct bond_entry *e;
     struct list bals;
 
-    if (bond->balance == BM_AB || time_msec() < bond->next_rebalance) {
+    if (!bond_is_balanced(bond) || time_msec() < bond->next_rebalance) {
         return;
     }
     bond->next_rebalance = time_msec() + bond->rebalance_interval;
@@ -1000,37 +931,26 @@ bond_unixctl_show(struct unixctl_conn *conn,
     ds_put_format(&ds, "bond_mode: %s\n",
                   bond_mode_to_string(bond->balance));
 
-    if (bond->lacp) {
-        ds_put_format(&ds, "lacp: %s\n",
-                      lacp_is_active(bond->lacp) ? "active" : "passive");
-    } else {
-        ds_put_cstr(&ds, "lacp: off\n");
-    }
-
     if (bond->balance != BM_AB) {
         ds_put_format(&ds, "bond-hash-algorithm: %s\n",
                       bond_is_tcp_hash(bond) ? "balance-tcp" : "balance-slb");
     }
 
-    ds_put_format(&ds, "bond-detect-mode: %s\n",
-                  bond->monitor ? "carrier" : "miimon");
-
-    if (!bond->monitor) {
-        ds_put_format(&ds, "bond-miimon-interval: %lld\n",
-                      bond->miimon_interval);
-    }
+    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->balance != BM_AB) {
+    if (bond_is_balanced(bond)) {
         ds_put_format(&ds, "next rebalance: %lld ms\n",
                       bond->next_rebalance - time_msec());
     }
 
+    ds_put_format(&ds, "lacp_negotiated: %s\n",
+                  bond->lacp_negotiated ? "true" : "false");
+
     HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) {
         struct bond_entry *be;
-        struct flow flow;
 
         /* Basic info. */
         ds_put_format(&ds, "\nslave %s: %s\n",
@@ -1044,12 +964,14 @@ bond_unixctl_show(struct unixctl_conn *conn,
                           slave->delay_expires - time_msec());
         }
 
-        if (bond->balance == BM_AB) {
+        ds_put_format(&ds, "\tlacp_may_enable: %s\n",
+                      slave->lacp_may_enable ? "true" : "false");
+
+        if (!bond_is_balanced(bond)) {
             continue;
         }
 
         /* Hashes. */
-        memset(&flow, 0, sizeof flow);
         for (be = bond->hash; be <= &bond->hash[BOND_MASK]; be++) {
             int hash = be - bond->hash;
 
@@ -1234,11 +1156,13 @@ bond_unixctl_hash(struct unixctl_conn *conn, const char *args_,
     uint8_t hash;
     char *hash_cstr;
     unsigned int vlan;
-    char *mac_s, *vlan_s;
+    uint32_t basis;
+    char *mac_s, *vlan_s, *basis_s;
     char *save_ptr = NULL;
 
     mac_s  = strtok_r(args, " ", &save_ptr);
     vlan_s = strtok_r(NULL, " ", &save_ptr);
+    basis_s = strtok_r(NULL, " ", &save_ptr);
 
     if (vlan_s) {
         if (sscanf(vlan_s, "%u", &vlan) != 1) {
@@ -1249,9 +1173,18 @@ bond_unixctl_hash(struct unixctl_conn *conn, const char *args_,
         vlan = OFP_VLAN_NONE;
     }
 
+    if (basis_s) {
+        if (sscanf(basis_s, "%"PRIu32, &basis) != 1) {
+            unixctl_command_reply(conn, 501, "invalid basis");
+            return;
+        }
+    } else {
+        basis = 0;
+    }
+
     if (sscanf(mac_s, ETH_ADDR_SCAN_FMT, ETH_ADDR_SCAN_ARGS(mac))
         == ETH_ADDR_SCAN_COUNT) {
-        hash = bond_hash_src(mac, vlan) & BOND_MASK;
+        hash = bond_hash_src(mac, vlan, basis) & BOND_MASK;
 
         hash_cstr = xasprintf("%u", hash);
         unixctl_command_reply(conn, 200, hash_cstr);
@@ -1264,8 +1197,6 @@ bond_unixctl_hash(struct unixctl_conn *conn, const char *args_,
 void
 bond_init(void)
 {
-    lacp_init();
-
     unixctl_command_register("bond/list", bond_unixctl_list, NULL);
     unixctl_command_register("bond/show", bond_unixctl_show, NULL);
     unixctl_command_register("bond/migrate", bond_unixctl_migrate, NULL);
@@ -1278,6 +1209,24 @@ bond_init(void)
     unixctl_command_register("bond/hash", bond_unixctl_hash, NULL);
 }
 
+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_)
 {
@@ -1293,27 +1242,26 @@ bond_slave_lookup(struct bond *bond, const void *slave_)
     return NULL;
 }
 
-static bool
-bond_is_link_up(struct bond *bond, struct netdev *netdev)
-{
-    return (bond->detect == BLSM_CARRIER
-            ? netdev_get_carrier(netdev)
-            : netdev_get_miimon(netdev));
-}
-
 static void
 bond_enable_slave(struct bond_slave *slave, bool enable, struct tag_set *tags)
 {
+    struct bond *bond = slave->bond;
     slave->delay_expires = LLONG_MAX;
     if (enable != slave->enabled) {
         slave->enabled = enable;
         if (!slave->enabled) {
             VLOG_WARN("interface %s: disabled", slave->name);
-            tag_set_add(tags, slave->tag);
+            if (tags) {
+                tag_set_add(tags, slave->tag);
+            }
         } else {
             VLOG_WARN("interface %s: enabled", slave->name);
             slave->tag = tag_create_random();
         }
+
+        if (bond->balance == BM_STABLE) {
+            bond->bond_revalidate = true;
+        }
     }
 }
 
@@ -1323,7 +1271,7 @@ bond_link_status_update(struct bond_slave *slave, struct tag_set *tags)
     struct bond *bond = slave->bond;
     bool up;
 
-    up = slave->up && lacp_slave_may_enable(bond->lacp, slave);
+    up = netdev_get_carrier(slave->netdev) && slave->lacp_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",
@@ -1333,7 +1281,7 @@ bond_link_status_update(struct bond_slave *slave, struct tag_set *tags)
             VLOG_INFO_RL(&rl, "interface %s: will not be %s",
                          slave->name, up ? "disabled" : "enabled");
         } else {
-            int delay = (lacp_negotiated(bond->lacp) ? 0
+            int delay = (bond->lacp_negotiated ? 0
                          : up ? bond->updelay : bond->downdelay);
             slave->delay_expires = time_msec() + delay;
             if (delay) {
@@ -1355,35 +1303,74 @@ bond_link_status_update(struct bond_slave *slave, struct tag_set *tags)
 static bool
 bond_is_tcp_hash(const struct bond *bond)
 {
-    return bond->balance == BM_TCP && lacp_negotiated(bond->lacp);
+    return (bond->balance == BM_TCP || bond->balance == BM_STABLE)
+        && bond->lacp_negotiated;
 }
 
 static unsigned int
-bond_hash_src(const uint8_t mac[ETH_ADDR_LEN], uint16_t vlan)
+bond_hash_src(const uint8_t mac[ETH_ADDR_LEN], uint16_t vlan, uint32_t basis)
 {
-    return hash_bytes(mac, ETH_ADDR_LEN, vlan);
+    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)
+bond_hash_tcp(const struct flow *flow, uint16_t vlan, uint32_t basis)
 {
     struct flow hash_flow = *flow;
-    hash_flow.vlan_tci = vlan;
+    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, 0);
+    return flow_hash_symmetric_l4(&hash_flow, basis);
+}
+
+static unsigned int
+bond_hash(const struct bond *bond, const struct flow *flow, uint16_t vlan)
+{
+    assert(bond->balance != BM_AB);
+
+    return (bond_is_tcp_hash(bond)
+            ? 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)
 {
-    assert(bond->balance != BM_AB);
-    return &bond->hash[(bond_is_tcp_hash(bond)
-                        ? bond_hash_tcp(flow, vlan)
-                        : bond_hash_src(flow->dl_src, vlan)) & BOND_MASK];
+    return &bond->hash[bond_hash(bond, flow, vlan) & BOND_MASK];
+}
+
+/* This function uses Highest Random Weight hashing to choose an output slave.
+ * This approach only reassigns a minimal number of flows when slaves are
+ * enabled or disabled.  Unfortunately, it has O(n) performance against the
+ * number of slaves.  There exist algorithms which are O(1), but have slightly
+ * more complex implementations and require the use of memory.  This may need
+ * to be reimplemented if it becomes a performance bottleneck. */
+static struct bond_slave *
+choose_stb_slave(const struct bond *bond, const struct flow *flow,
+                 uint16_t vlan)
+{
+    struct bond_slave *best, *slave;
+    uint32_t best_hash, flow_hash;
+
+    best = NULL;
+    best_hash = 0;
+    flow_hash = bond_hash(bond, flow, vlan);
+    HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) {
+        if (slave->enabled) {
+            uint32_t hash;
+
+            hash = hash_2words(flow_hash, slave->stb_id);
+            if (!best || hash > best_hash) {
+                best = slave;
+                best_hash = hash;
+            }
+        }
+    }
+
+    return best;
 }
 
 static struct bond_slave *
@@ -1396,6 +1383,8 @@ choose_output_slave(const struct bond *bond, const struct flow *flow,
     case BM_AB:
         return bond->active_slave;
 
+    case BM_STABLE:
+        return choose_stb_slave(bond, flow, vlan);
     case BM_SLB:
     case BM_TCP:
         e = lookup_bond_entry(bond, flow, vlan);
@@ -1431,7 +1420,7 @@ bond_choose_slave(const struct bond *bond)
     best = NULL;
     HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) {
         if (slave->delay_expires != LLONG_MAX
-            && lacp_slave_may_enable(bond->lacp, slave)
+            && slave->lacp_may_enable
             && (!best || slave->delay_expires < best->delay_expires)) {
             best = slave;
         }