[ovs-dev] [PATCH v7] AB bonding: Add "primary" interface concept

Ilya Maximets i.maximets at ovn.org
Thu Jun 18 13:44:52 UTC 2020


On 5/22/20 11:12 PM, Jeff Squyres via dev wrote:
> In AB bonding, if the current active slave becomes disabled, a
> replacement slave is arbitrarily picked from the remaining set of
> enabled slaves.  This commit adds the concept of a "primary" slave: an
> interface that will always be (or become) the current active slave if
> it is enabled.
> 
> The rationale for this functionality is to allow the designation of a
> preferred interface for a given bond.  For example:
> 
> 1. Bond is created with interfaces p1 (primary) and p2, both enabled.
> 2. p1 becomes the current active slave (because it was designated as
>    the primary).
> 3. Later, p1 fails/becomes disabled.
> 4. p2 is chosen to become the current active slave.
> 5. Later, p1 becomes re-enabled.
> 6. p1 is chosen to become the current active slave (because it was
>    designated as the primary)
> 
> Note that p1 becomes the active slave once it becomes re-enabled, even
> if nothing has happened to p2.
> 
> This "primary" concept exists in Linux kernel network interface
> bonding, but did not previously exist in OVS bonding.
> 
> Only one primary slave inteface is supported per bond, and is only
> supported for active/backup bonding.

Does it work for the case where balanced bonding falls back to active-backup?
It seems like it should, but I see that code doesn't handle this in a few
places.  IMHO, it might make sence to add this support.

Comments inline.

Best regards, Ilya Maximets.

> 
> The primary slave interface is designated via
> "other_config:bond-primary" when creating a bond.
> 
> Signed-off-by: Jeff Squyres <jsquyres at cisco.com>
> Reviewed-by: Aaron Conole <aconole at redhat.com>
> Tested-by: Greg Rose <gvrose8192 at gmail.com>
> Acked-by: Greg Rose <gvrose8192 at gmail.com>
> ---
> v7:
> - After rebasing patch to head of tree, adjust test output as result
>   of changes from 81f71381f.
> 
> v6:
> - Style: bleep bloop.  Fix use of {}.
> 
> v5:
> - Handle when bond is reconfigured to remove "bond-primary" config.
> - Fix potential flapping between remaining slaves.
> - Add a test to re-add a removed primary interface and make sure the
>   bond reflects that properly.
> - Add a test to remove "bond-primary" config and make sure the bond
>   reflects that properly.
> 
> v4:
> - Style: bleep bloop.  Trim line length below 79 characters.
> 
> v3:
> - Adjusted print logic for when the primary slave is not attached
> 
> v2:
> - Added "ovs-vsctl bond/show" label when primary interface is no
>   longer enslaved
> - Fixed strcmp() usage nits
> - Moved "other_config:bond-primary" docs to the "Bonding
>   Configuration" group
> - Expanded commit message
> - Added more test cases (including one for when the primary interface
>   is no longer enslaved)
> 
>  ofproto/bond.c        |  75 +++++++++++++++-
>  ofproto/bond.h        |   1 +
>  tests/lacp.at         |   1 +
>  tests/ofproto-dpif.at | 199 +++++++++++++++++++++++++++++++++++++++++-
>  vswitchd/bridge.c     |   5 ++
>  vswitchd/vswitch.xml  |   8 ++
>  6 files changed, 287 insertions(+), 2 deletions(-)
> 
> diff --git a/ofproto/bond.c b/ofproto/bond.c
> index 405202fb6..4ad1a20ae 100644
> --- a/ofproto/bond.c
> +++ b/ofproto/bond.c
> @@ -93,6 +93,7 @@ struct bond_slave {
>      /* Link status. */
>      bool enabled;               /* May be chosen for flows? */
>      bool may_enable;            /* Client considers this slave bondable. */
> +    bool is_primary;            /* This slave is preferred over others. */
>      long long delay_expires;    /* Time after which 'enabled' may change. */
>  
>      /* Rebalancing info.  Used only by bond_rebalance(). */
> @@ -126,6 +127,7 @@ struct bond {
>      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. */
> +    char *primary;              /* Name of the primary slave interface. */
>  
>      /* SLB specific bonding info. */
>      struct bond_entry *hash;     /* An array of BOND_BUCKETS elements. */
> @@ -241,6 +243,7 @@ bond_create(const struct bond_settings *s, struct ofproto_dpif *ofproto)
>  
>      bond->active_slave_mac = eth_addr_zero;
>      bond->active_slave_changed = false;
> +    bond->primary = NULL;
>  
>      bond_reconfigure(bond, s);
>      return bond;
> @@ -290,6 +293,7 @@ bond_unref(struct bond *bond)
>      update_recirc_rules__(bond);
>  
>      hmap_destroy(&bond->pr_rule_ops);
> +    free(bond->primary);
>      free(bond->name);
>      free(bond);
>  }
> @@ -459,6 +463,39 @@ bond_reconfigure(struct bond *bond, const struct bond_settings *s)
>          bond->bond_revalidate = false;
>      }
>  
> +    /*
> +     * If a primary interface is set on the new settings:
> +     * 1. If the bond has no primary previously set, save it and
> +     * revalidate.
> +     * 2. If the bond has a different primary previously set, save the
> +     * new one and revalidate.
> +     * 3. If the bond has the same primary previously set, do nothing.
> +     */
> +    if (s->primary) {
> +        bool changed = false;
> +        if (bond->primary) {
> +            if (strcmp(bond->primary, s->primary)) {
> +                free(bond->primary);
> +                changed = true;
> +            }
> +        } else {
> +            changed = true;
> +        }
> +
> +        if (changed) {
> +            bond->primary = xstrdup(s->primary);
> +            revalidate = true;
> +        }
> +    } else if (bond->primary) {
> +        /*
> +         * If the new settings have no primary interface, but the
> +         * bond already has a primary, remove the bond's primary.
> +         */
> +        free(bond->primary);
> +        bond->primary = NULL;
> +        revalidate = true;
> +    }
> +

Does above code equal to:

    if (!nullable_string_is_equal(bond->primary, s->primary)) {
        free(bond->primary);
        bond->primary = nullable_xstrdup(s->primary);
        revalidate = true;
    }

?

>      if (bond->balance != BM_AB) {
>          if (!bond->recirc_id) {
>              bond->recirc_id = recirc_alloc_id(bond->ofproto);
> @@ -549,6 +586,12 @@ bond_slave_register(struct bond *bond, void *slave_,
>          slave->name = xstrdup(netdev_get_name(netdev));
>          bond->bond_revalidate = true;
>  
> +        if (bond->primary && !strcmp(bond->primary, slave->name)) {
> +            slave->is_primary = true;
> +        } else {
> +            slave->is_primary = false;
> +        }
> +
>          slave->enabled = false;
>          bond_enable_slave(slave, netdev_get_carrier(netdev));
>      }
> @@ -644,6 +687,7 @@ bond_run(struct bond *bond, enum lacp_status lacp_status)
>  {
>      struct bond_slave *slave;
>      bool revalidate;
> +    struct bond_slave *primary;

Could you keep a reversed x-mass tree here?  It's not a requirement, but at least
we're trying to keep definitions of 'struct' variables close to each other.
You could even combine the definition with '*slave' one.

>  
>      ovs_rwlock_wrlock(&rwlock);
>      if (bond->lacp_status != lacp_status) {
> @@ -659,11 +703,19 @@ bond_run(struct bond *bond, enum lacp_status lacp_status)
>      }
>  
>      /* Enable slaves based on link status and LACP feedback. */
> +    primary = NULL;
>      HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) {
>          bond_link_status_update(slave);
>          slave->change_seq = seq_read(connectivity_seq_get());
> +
> +        /* Discover if there is an active slave marked "primary". */

Please, use single quotes (') in commnets if possible.

> +        if (bond->balance == BM_AB && slave->is_primary && slave->enabled) {
> +            primary = slave;
> +        }
>      }
> -    if (!bond->active_slave || !bond->active_slave->enabled) {
> +
> +    if (!bond->active_slave || !bond->active_slave->enabled ||
> +        (primary && primary->enabled && bond->active_slave)) {

We already checked that 'primary' is enabled in a previous loop.
And we don't need to check for 'bond->active_slave' second time.
If it's NULL, we will not reach this condition anyway.

Don't we need to check that bond->active_slave != primary ?

The 'if', I think, should look like this:

    if (!bond->active_slave || !bond->active_slave->enabled ||
        (primary && bond->active_slave != primary)) {

>          bond_choose_active_slave(bond);
>      }
>  
> @@ -1393,6 +1445,20 @@ bond_print_details(struct ds *ds, const struct bond *bond)
>      ds_put_format(ds, "lacp_fallback_ab: %s\n",
>                    bond->lacp_fallback_ab ? "true" : "false");
>  
> +    bool found_primary = false;
> +    HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) {

There is a similar HAMP iteration loop a bit below, can we combine them
to avoid double iteration?

> +        if (slave->is_primary) {
> +            found_primary = true;
> +        }
> +    }
> +
> +    if (bond->balance == BM_AB) {

This doesn't handle case where balance-tcp falls back to AB.
We might want to print this value regardles of mode, but add
extra words to clarify, i.e. "primary: " vs "active-backup primary: ".

> +        ds_put_format(ds, "primary: %s%s\n",
> +                      bond->primary ? bond->primary : "<none>",
> +                      (!found_primary && bond->primary) ?

Please, move the question mark to the next line.

> +                      " (no such slave)" : "");
> +    }
> +
>      ds_put_cstr(ds, "active slave mac: ");
>      ds_put_format(ds, ETH_ADDR_FMT, ETH_ADDR_ARGS(bond->active_slave_mac));
>      slave = bond_find_slave_by_mac(bond, bond->active_slave_mac);
> @@ -1862,6 +1928,13 @@ bond_choose_slave(const struct bond *bond)
>  {
>      struct bond_slave *slave, *best;
>  
> +    /* If there's a primary and it's active, return that. */
> +    HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) {
> +        if (slave->is_primary && slave->enabled) {
> +            return slave;
> +        }
> +    }
> +
>      /* Find the last active slave. */
>      slave = bond_find_slave_by_mac(bond, bond->active_slave_mac);
>      if (slave && slave->enabled) {
> diff --git a/ofproto/bond.h b/ofproto/bond.h
> index e7c3d9bc3..3a923dcfa 100644
> --- a/ofproto/bond.h
> +++ b/ofproto/bond.h
> @@ -45,6 +45,7 @@ struct bond_settings {
>  
>      /* Balancing configuration. */
>      enum bond_mode balance;
> +    const char *primary;        /* For AB balance, primary interface name. */
>      int rebalance_interval;     /* Milliseconds between rebalances.
>                                     Zero to disable rebalancing. */
>  
> diff --git a/tests/lacp.at b/tests/lacp.at
> index 7b460d7be..696ffc6d4 100644
> --- a/tests/lacp.at
> +++ b/tests/lacp.at
> @@ -125,6 +125,7 @@ updelay: 0 ms
>  downdelay: 0 ms
>  lacp_status: negotiated
>  lacp_fallback_ab: false
> +primary: <none>
>  active slave mac: 00:00:00:00:00:00(none)
>  
>  slave p1: disabled
> diff --git a/tests/ofproto-dpif.at b/tests/ofproto-dpif.at
> index 41164d735..b2d8c089f 100644
> --- a/tests/ofproto-dpif.at
> +++ b/tests/ofproto-dpif.at
> @@ -29,7 +29,203 @@ AT_CHECK([ovs-appctl revalidator/wait])
>  OVS_VSWITCHD_STOP
>  AT_CLEANUP
>  
> -AT_SETUP([ofproto-dpif - active-backup bonding])
> +AT_SETUP([ofproto-dpif - active-backup bonding (with primary)])
> +
> +# Create br0 with interfaces p1, p2 and p7, creating bond0 with p1 and
> +#    p2 (p1 as primary) and br1 with interfaces p3, p4 and p8.
> +# toggle p1,p2 of bond0 up and down to test bonding in active-backup mode.
> +# With p1 down and p2 up/active, bring p1 back up.  Since p1 is the primary,
> +# it should become active.

Please, use 'dnl' for commnets as possible.  I understand that the file is not
that consistent already, but it's better to not make it worse.

> +OVS_VSWITCHD_START(
> +  [add-bond br0 bond0 p1 p2 bond_mode=active-backup \
> +                other_config:bond-primary=p1 -- \
> +   set interface p1 type=dummy options:pstream=punix:$OVS_RUNDIR/p1.sock ofport_request=1 -- \
> +   set interface p2 type=dummy options:pstream=punix:$OVS_RUNDIR/p2.sock ofport_request=2 -- \
> +   add-port br0 p7 -- set interface p7 ofport_request=7 type=dummy -- \
> +   add-br br1 -- \
> +   set bridge br1 other-config:hwaddr=aa:66:aa:66:00:00 -- \
> +   set bridge br1 datapath-type=dummy other-config:datapath-id=1234 \
> +                  fail-mode=secure -- \
> +   add-port br1 p3 -- set interface p3 type=dummy options:stream=unix:$OVS_RUNDIR/p1.sock ofport_request=3 -- \
> +   add-port br1 p4 -- set interface p4 type=dummy options:stream=unix:$OVS_RUNDIR/p2.sock ofport_request=4 -- \
> +   add-port br1 p8 -- set interface p8 ofport_request=8 type=dummy --])
> +WAIT_FOR_DUMMY_PORTS([p3], [p4])
> +AT_CHECK([test -n "`ovs-appctl bond/show | grep 'primary: p1'`"])

Configuration updates are not immediate.  It's better to use OVS_WAIT_UNTIL.

> +AT_CHECK([ovs-appctl vlog/set dpif:dbg dpif_netdev:dbg])

It's better to enable debug before the previous operation.

> +
> +AT_CHECK([ovs-ofctl add-flow br0 action=normal])
> +AT_CHECK([ovs-ofctl add-flow br1 action=normal])
> +ovs-appctl netdev-dummy/set-admin-state up
> +ovs-appctl time/warp 100
> +ovs-appctl netdev-dummy/set-admin-state p2 down
> +ovs-appctl time/stop
> +ovs-appctl time/warp 100
> +AT_CHECK([ovs-appctl netdev-dummy/receive p7 'in_port(7),eth(src=50:54:00:00:00:09,dst=50:54:00:00:00:0a),eth_type(0x0800),ipv4(src=10.0.0.2,dst=10.0.0.1,proto=1,tos=0,ttl=64,frag=no),icmp(type=8,code=0)'])
> +AT_CHECK([ovs-appctl netdev-dummy/receive p7 'in_port(7),eth(src=50:54:00:00:00:0b,dst=50:54:00:00:00:0c),eth_type(0x0800),ipv4(src=10.0.0.3,dst=10.0.0.4,proto=1,tos=0,ttl=64,frag=no),icmp(type=8,code=0)'])
> +ovs-appctl time/warp 100
> +ovs-appctl netdev-dummy/set-admin-state p2 up
> +ovs-appctl netdev-dummy/set-admin-state p1 down
> +ovs-appctl time/warp 100
> +AT_CHECK([ovs-appctl netdev-dummy/receive p7 'in_port(7),eth(src=50:54:00:00:00:09,dst=50:54:00:00:00:0d),eth_type(0x0800),ipv4(src=10.0.0.5,dst=10.0.0.1,proto=1,tos=0,ttl=64,frag=no),icmp(type=8,code=0)'])
> +AT_CHECK([ovs-appctl netdev-dummy/receive p7 'in_port(7),eth(src=50:54:00:00:00:09,dst=50:54:00:00:00:0e),eth_type(0x0800),ipv4(src=10.0.0.6,dst=10.0.0.1,proto=1,tos=0,ttl=64,frag=no),icmp(type=8,code=0)'])
> +ovs-appctl time/warp 200 100
> +sleep 1

Why sleep here?  You already using time/wrap.  Just modify the wrapping values.

> +AT_CHECK([grep 'in_port([[348]])' ovs-vswitchd.log | filter_flow_install | strip_xout], [0], [dnl

Instead of parsing the log it might be better to dump flows via 'ovs-appctl dpctl/dump-flows'.

> +recirc_id(0),in_port(3),packet_type(ns=0,id=0),eth(src=50:54:00:00:00:09,dst=50:54:00:00:00:0a),eth_type(0x0800),ipv4(frag=no), actions: <del>
> +recirc_id(0),in_port(3),packet_type(ns=0,id=0),eth(src=50:54:00:00:00:09,dst=ff:ff:ff:ff:ff:ff),eth_type(0x8035), actions: <del>
> +recirc_id(0),in_port(3),packet_type(ns=0,id=0),eth(src=50:54:00:00:00:0b,dst=50:54:00:00:00:0c),eth_type(0x0800),ipv4(frag=no), actions: <del>
> +recirc_id(0),in_port(3),packet_type(ns=0,id=0),eth(src=50:54:00:00:00:0b,dst=ff:ff:ff:ff:ff:ff),eth_type(0x8035), actions: <del>
> +recirc_id(0),in_port(4),packet_type(ns=0,id=0),eth(src=50:54:00:00:00:09,dst=50:54:00:00:00:0d),eth_type(0x0800),ipv4(frag=no), actions: <del>
> +recirc_id(0),in_port(4),packet_type(ns=0,id=0),eth(src=50:54:00:00:00:09,dst=50:54:00:00:00:0e),eth_type(0x0800),ipv4(frag=no), actions: <del>
> +recirc_id(0),in_port(4),packet_type(ns=0,id=0),eth(src=50:54:00:00:00:09,dst=ff:ff:ff:ff:ff:ff),eth_type(0x8035), actions: <del>
> +recirc_id(0),in_port(4),packet_type(ns=0,id=0),eth(src=50:54:00:00:00:0b,dst=ff:ff:ff:ff:ff:ff),eth_type(0x8035), actions: <del>
> +])
> +
> +ovs-appctl netdev-dummy/set-admin-state p1 up
> +AT_CHECK([ovs-appctl bond/show | STRIP_RECIRC_ID | STRIP_ACTIVE_SLAVE_MAC], [0], [dnl

Port state updates might not be propagated in time.  We need to wait somehow.

> +---- bond0 ----
> +bond_mode: active-backup
> +bond may use recirculation: no, <del>
> +bond-hash-basis: 0
> +updelay: 0 ms
> +downdelay: 0 ms
> +lacp_status: off
> +lacp_fallback_ab: false
> +primary: p1
> +<active slave mac del>
> +
> +slave p1: enabled
> +  active slave
> +  may_enable: true
> +
> +slave p2: enabled
> +  may_enable: true
> +
> +])
> +
> +AT_CHECK([test -n "`ovs-appctl bond/show | grep 'primary: p1'`"])

We just checked the full output of this command, no need to do this again.

> +
> +OVS_VSWITCHD_STOP
> +AT_CLEANUP
> +
> +AT_SETUP([ofproto-dpif - active-backup bonding (primary validation)])
> +# Make a switch with 3 ports in a bond, so that when we delete one of
> +# the ports from the bond, there are still 2 ports left and the bond
> +# remains functional.

Same here.

> +OVS_VSWITCHD_START(
> +  [add-bond br0 bond0 p1 p2 p3 bond_mode=active-backup \
> +                other_config:bond-primary=p1 -- \
> +   set interface p1 type=dummy options:pstream=punix:$OVS_RUNDIR/p1.sock ofport_request=1 -- \
> +   set interface p2 type=dummy options:pstream=punix:$OVS_RUNDIR/p2.sock ofport_request=2 -- \
> +   set interface p3 type=dummy options:pstream=punix:$OVS_RUNDIR/p3.sock ofport_request=3 -- \
> +   add-port br0 p7 -- set interface p7 ofport_request=7 type=dummy --])
> +
> +dnl Make sure the initial primary interface is set
> +AT_CHECK([test -n "`ovs-appctl bond/show | grep 'primary: p1'`"])

Ditto.

> +
> +dnl Down the primary interface and verify that we switched.  Then
> +dnl bring the primary back and verify that we switched back to the
> +dnl primary.
> +ovs-appctl netdev-dummy/set-admin-state p1 down
> +AT_CHECK([test -n "`ovs-appctl bond/show | fgrep 'slave p1: disabled'`"])

Ditto.

> +ovs-appctl netdev-dummy/set-admin-state p1 up
> +AT_CHECK([ovs-appctl bond/show | STRIP_RECIRC_ID | STRIP_ACTIVE_SLAVE_MAC], [0], [dnl

Ditto.

> +---- bond0 ----
> +bond_mode: active-backup
> +bond may use recirculation: no, <del>
> +bond-hash-basis: 0
> +updelay: 0 ms
> +downdelay: 0 ms
> +lacp_status: off
> +lacp_fallback_ab: false
> +primary: p1
> +<active slave mac del>
> +
> +slave p1: enabled
> +  active slave
> +  may_enable: true
> +
> +slave p2: enabled
> +  may_enable: true
> +
> +slave p3: enabled
> +  may_enable: true
> +
> +])
> +
> +dnl Now delete the primary and verify that the output shows that the
> +dnl primary is no longer enslaved
> +ovs-vsctl --id=@p1 get Interface p1 -- remove Port bond0 interfaces @p1
> +AT_CHECK([test -n "`ovs-appctl bond/show | fgrep 'primary: p1 (no such slave)'`"])

Ditto.

> +
> +dnl Now re-add the primary and verify that the output shows that the
> +dnl primary is available again.
> +dnl
> +dnl First, get the UUIDs of the interfaces that exist on bond0.
> +dnl Strip the trailing ] so that we can add a new UUID to the end.
> +uuids=`ovs-vsctl get Port bond0 interfaces | sed -e 's/]//'`
> +dnl Create a new port "p1" and add its UUID to the set of interfaces
> +dnl on bond0.
> +ovs-vsctl \
> +   --id=@p1 create Interface name=p1 type=dummy options:pstream=punix:$OVS_RUNDIR/p1.sock ofport_request=1 -- \
> +   set Port bond0 interfaces="$uuids, @p1]"
> +AT_CHECK([ovs-appctl bond/show | STRIP_RECIRC_ID | STRIP_ACTIVE_SLAVE_MAC], [0], [dnl

Ditto.

> +---- bond0 ----
> +bond_mode: active-backup
> +bond may use recirculation: no, <del>
> +bond-hash-basis: 0
> +updelay: 0 ms
> +downdelay: 0 ms
> +lacp_status: off
> +lacp_fallback_ab: false
> +primary: p1
> +<active slave mac del>
> +
> +slave p1: enabled
> +  active slave
> +  may_enable: true
> +
> +slave p2: enabled
> +  may_enable: true
> +
> +slave p3: enabled
> +  may_enable: true
> +
> +])
> +
> +dnl Remove the "bond-primary" config directive from the bond.
> +dnl First, find the other_config values on bond0.
> +other_config=`ovs-vsctl get Port bond0 other_config | sed -e 's/\(, \)*bond-primary=p1//'`
> +dnl Now re-set the other_config on bond0.
> +ovs-vsctl set Port bond0 other_config="$other_config"

You can remove one entry like this:

  ovs-vsctl remove Port bond0 other_config bond-primary

> +AT_CHECK([ovs-appctl bond/show | STRIP_RECIRC_ID | STRIP_ACTIVE_SLAVE_MAC], [0], [dnl

Some waiting needed.

> +---- bond0 ----
> +bond_mode: active-backup
> +bond may use recirculation: no, <del>
> +bond-hash-basis: 0
> +updelay: 0 ms
> +downdelay: 0 ms
> +lacp_status: off
> +lacp_fallback_ab: false
> +primary: <none>
> +<active slave mac del>
> +
> +slave p1: enabled
> +  active slave
> +  may_enable: true
> +
> +slave p2: enabled
> +  may_enable: true
> +
> +slave p3: enabled
> +  may_enable: true
> +
> +])
> +
> +OVS_VSWITCHD_STOP
> +AT_CLEANUP
> +
> +AT_SETUP([ofproto-dpif - active-backup bonding (without primary)])
>  # Create br0 with interfaces p1, p2 and p7, creating bond0 with p1 and p2
>  #    and br1 with interfaces p3, p4 and p8.
>  # toggle p1,p2 of bond0 up and down to test bonding in active-backup mode.
> @@ -46,6 +242,7 @@ OVS_VSWITCHD_START(
>     add-port br1 p4 -- set interface p4 type=dummy options:stream=unix:$OVS_RUNDIR/p2.sock ofport_request=4 -- \
>     add-port br1 p8 -- set interface p8 ofport_request=8 type=dummy --])
>  WAIT_FOR_DUMMY_PORTS([p3], [p4])
> +AT_CHECK([test -n "`ovs-appctl bond/show | grep 'primary: <none>'`"])

Waiting is needed and ned to move this line below the logging configuration.

>  AT_CHECK([ovs-appctl vlog/set dpif:dbg dpif_netdev:dbg])
>  
>  AT_CHECK([ovs-ofctl add-flow br0 action=normal])
> diff --git a/vswitchd/bridge.c b/vswitchd/bridge.c
> index fe73c38d4..5f30b7737 100644
> --- a/vswitchd/bridge.c
> +++ b/vswitchd/bridge.c
> @@ -4563,6 +4563,11 @@ port_configure_bond(struct port *port, struct bond_settings *s)
>                    port->name);
>      }
>  
> +    s->primary = NULL;
> +    if (s->balance == BM_AB) {

Need to check for lacp_fallback_ab_cfg too?

> +        s->primary = smap_get(&port->cfg->other_config, "bond-primary");
> +    }
> +
>      miimon_interval = smap_get_int(&port->cfg->other_config,
>                                     "bond-miimon-interval", 0);
>      if (miimon_interval <= 0) {
> diff --git a/vswitchd/vswitch.xml b/vswitchd/vswitch.xml
> index 6d334370d..a2a26e849 100644
> --- a/vswitchd/vswitch.xml
> +++ b/vswitchd/vswitch.xml
> @@ -1994,6 +1994,14 @@
>          <code>active-backup</code>.
>        </column>
>  
> +      <column name="other_config" key="bond-primary"
> +              type='{"type": "string"}'>
> +        If a slave interface with this name exists in the bond and
> +        is up, it will be made active.  Relevant only when <ref
> +        column="other_config" key="bond-mode"/> is
> +        <code>active-backup</code>.
> +      </column>
> +
>        <group title="Link Failure Detection">
>          <p>
>            An important part of link bonding is detecting that links are down so
> 



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