Thanks for your feedback Dumitru and Numan.
I assume you are referring to the “link_state” column in the interface table?

The proposed solution looks cleaner to me as well.
We will revisit and come back with a patch.

Thanks,
Shibir
From: Dumitru Ceara <[email protected]>
Date: Wednesday, 6 November 2024 at 2:46 PM
To: Numan Siddique <[email protected]>, Shibir Basak <[email protected]>
Cc: [email protected] <[email protected]>
Subject: Re: [ovs-dev] [PATCH ovn v3] controller: Cleanup FDB entries when a 
VIF goes down.
!-------------------------------------------------------------------|
  CAUTION: External Email

|-------------------------------------------------------------------!

Hi Shibir, Numan,

Sorry for the delay in replying.

On 10/23/24 16:32, Numan Siddique wrote:
> On Mon, Oct 21, 2024 at 11:40 AM Shibir Basak <[email protected]> 
> wrote:
>>
>> Hi Team/Dumitru,
>>
>> Can you review the updated v3 patch,
>>
>> Thanks,
>> Shibir
>
>
> Hi Shibir,
>
> Thanks for the patch.
>
> I've a few comments about this patch.  I did see the discussions and
> your replies in v1 and v2.
> So I'm aware of the context why you've chosen the garp/rarp mechanism
> to clean up FDB entries.
>
> I've a few questions and comments.
>
> 1.  Your patch doesn't clean up FDP entries of logical ports if the
> logical switch doesn't have a localnet port.
>       Is that going to be an issue?
>
> 2. If ovn-controller is down when the VM's link goes down,  then the
> FDB Entry is not cleaned up until
>     it's done by north aging (if aging threshold is configured)
>
> Looks to me this solution is incomplete and doesn't seem like the
> correct way to do in pinctrl.c.
>
> I've below suggestions to address this issue
>
> 1.  Presently we bind a logical port in ovn-controller if the
>              - OVS interface record has external_ids:iface-id set and
>             -  ofport column of OVS interface record is set
>
>     We can add another condition to binding
>             -  "link" column of the OVS interface record is set to
> "up" by ovs-vswitchd.
>
>     If the link column is set to "down" ovn-controller should unbind
> the logical port.
>    This change can be handled in
> binding_handle_ovs_interface_changes() in binding.c.
>
>    This requires changes in binding.c
> (https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_ovn-2Dorg_ovn_blob_main_controller_binding.c-23L2037&d=DwIDaQ&c=s883GpUCOChKOHiocYtGcg&r=awcqDnvm2rXKiid0_aQK6D2Z4I6GarSRmeHuqVFlgU4&m=F4flTSTYKNPVq5Eau3mplM6mfgyThPJ5ZT0ICWUBdhb_pL5ghHlPkhnMuKNoosl2&s=C1X9ToE5X5rINrJ5O-cBreo7nUgaTm6xdn_PphezGEk&e=
>  )
>    and changes can be a bit tricky and it needs thorough testing.
>
> 2.  Add the FDB flows in table OFTABLE_GET_FDB for each FDB record
> (https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_ovn-2Dorg_ovn_blob_main_controller_lflow.c-23L2054&d=DwIDaQ&c=s883GpUCOChKOHiocYtGcg&r=awcqDnvm2rXKiid0_aQK6D2Z4I6GarSRmeHuqVFlgU4&m=F4flTSTYKNPVq5Eau3mplM6mfgyThPJ5ZT0ICWUBdhb_pL5ghHlPkhnMuKNoosl2&s=RSHIQyyAGdDcwvr9kIVMmDBeIAsO_UM7g4Z_WJVumZA&e=
>  )
> only
>      if the port binding is "up".
>

I think this is a good idea, thanks for bringing this up Numan!

> 3.  ovn-northd can clean up the stale fdb records (for deleted ports).
>

ovn-northd already does that (for deleted ports).  We do have a corner
case when two port_bindings change tunnel_keys (e.g., swap values due to
requested_tnl_id changes from the user): we might end up with incorrect
FDB records.  However, that's a different issue, not really relevant to
this patch.

> With this approach, all the ovn-controllers in the deployment will
> remove the FDB flows from table OFTABLE_GET_FDB as soon as the port
> binding status goes down.
>
> If the above approach seems too complicated I'm fine with this patch
> as an interim solution.
>

I vote for avoiding an interim solution.  If what you propose Numan
works for Shibir too, I'd prefer that.

> @Dumitru Ceara   wdyt ?
>
> Thanks
> Numan
>
>

Thanks,
Dumitru

>
>
>
>>
>>> On 19 Sep 2024, at 4:12 PM, Shibir Basak <[email protected]> wrote:
>>>
>>> When a VIF port goes down, all FDB entries associated
>>> with it are deleted.
>>> This helps is reducing traffic outage due to stale FDB
>>> entries present until the lsp is removed.
>>>
>>> Acked-by: Naveen Yerramneni <[email protected]>
>>> Signed-off-by: Shibir Basak <[email protected]>
>>> ---
>>> v1: initial version
>>> v2: Rebase on top of latest main
>>>    Addressed review comments from Dumitru
>>> v3: Addressed review comments from Dumitru
>>> ---
>>> controller/ovn-controller.c |  5 ++++
>>> controller/pinctrl.c        | 58 ++++++++++++++++++++-----------------
>>> controller/pinctrl.h        |  1 +
>>> lib/automake.mk             |  4 ++-
>>> lib/fdb.c                   | 49 +++++++++++++++++++++++++++++++
>>> lib/fdb.h                   | 29 +++++++++++++++++++
>>> northd/northd.c             | 17 +----------
>>> tests/ovn.at                | 50 ++++++++++++++++++++++++++++++++
>>> 8 files changed, 170 insertions(+), 43 deletions(-)
>>> create mode 100644 lib/fdb.c
>>> create mode 100644 lib/fdb.h
>>>
>>> diff --git a/controller/ovn-controller.c b/controller/ovn-controller.c
>>> index 64be08ce3..1dca2d579 100644
>>> --- a/controller/ovn-controller.c
>>> +++ b/controller/ovn-controller.c
>>> @@ -4939,6 +4939,10 @@ main(int argc, char *argv[])
>>>         = ovsdb_idl_index_create2(ovnsb_idl_loop.idl,
>>>                                   &sbrec_fdb_col_mac,
>>>                                   &sbrec_fdb_col_dp_key);
>>> +    struct ovsdb_idl_index *sbrec_fdb_by_dp_and_port
>>> +        = ovsdb_idl_index_create2(ovnsb_idl_loop.idl,
>>> +                                  &sbrec_fdb_col_port_key,
>>> +                                  &sbrec_fdb_col_dp_key);
>>>     struct ovsdb_idl_index *sbrec_mac_binding_by_datapath
>>>         = mac_binding_by_datapath_index_create(ovnsb_idl_loop.idl);
>>>     struct ovsdb_idl_index *sbrec_static_mac_binding_by_datapath
>>> @@ -5645,6 +5649,7 @@ main(int argc, char *argv[])
>>>                                     sbrec_igmp_group,
>>>                                     sbrec_ip_multicast,
>>>                                     sbrec_fdb_by_dp_key_mac,
>>> +                                    sbrec_fdb_by_dp_and_port,
>>>                                     sbrec_dns_table_get(ovnsb_idl_loop.idl),
>>>                                     sbrec_controller_event_table_get(
>>>                                         ovnsb_idl_loop.idl),
>>> diff --git a/controller/pinctrl.c b/controller/pinctrl.c
>>> index c86b4f940..44ad72987 100644
>>> --- a/controller/pinctrl.c
>>> +++ b/controller/pinctrl.c
>>> @@ -62,6 +62,7 @@
>>> #include "lflow.h"
>>> #include "ip-mcast.h"
>>> #include "ovn-sb-idl.h"
>>> +#include "lib/fdb.h"
>>>
>>> VLOG_DEFINE_THIS_MODULE(pinctrl);
>>>
>>> @@ -236,6 +237,7 @@ static void send_garp_rarp_prepare(
>>>     struct ovsdb_idl_index *sbrec_port_binding_by_datapath,
>>>     struct ovsdb_idl_index *sbrec_port_binding_by_name,
>>>     struct ovsdb_idl_index *sbrec_mac_binding_by_lport_ip,
>>> +    struct ovsdb_idl_index *sbrec_fdb_by_dp_and_port,
>>>     const struct ovsrec_bridge *,
>>>     const struct sbrec_chassis *,
>>>     const struct hmap *local_datapaths,
>>> @@ -376,9 +378,6 @@ static void bfd_monitor_run(struct ovsdb_idl_txn 
>>> *ovnsb_idl_txn,
>>>                             OVS_REQUIRES(pinctrl_mutex);
>>> static void init_fdb_entries(void);
>>> static void destroy_fdb_entries(void);
>>> -static const struct sbrec_fdb *fdb_lookup(
>>> -    struct ovsdb_idl_index *sbrec_fdb_by_dp_key_mac,
>>> -    uint32_t dp_key, const char *mac);
>>> static void run_put_fdb(struct ovsdb_idl_txn *ovnsb_idl_txn,
>>>                         struct ovsdb_idl_index *sbrec_fdb_by_dp_key_mac,
>>>             struct ovsdb_idl_index *sbrec_port_binding_by_key,
>>> @@ -4146,6 +4145,7 @@ pinctrl_run(struct ovsdb_idl_txn *ovnsb_idl_txn,
>>>             struct ovsdb_idl_index *sbrec_igmp_groups,
>>>             struct ovsdb_idl_index *sbrec_ip_multicast_opts,
>>>             struct ovsdb_idl_index *sbrec_fdb_by_dp_key_mac,
>>> +            struct ovsdb_idl_index *sbrec_fdb_by_dp_and_port,
>>>             const struct sbrec_dns_table *dns_table,
>>>             const struct sbrec_controller_event_table *ce_table,
>>>             const struct sbrec_service_monitor_table *svc_mon_table,
>>> @@ -4167,7 +4167,8 @@ pinctrl_run(struct ovsdb_idl_txn *ovnsb_idl_txn,
>>>                            sbrec_port_binding_by_key, chassis);
>>>     send_garp_rarp_prepare(ovnsb_idl_txn, sbrec_port_binding_by_datapath,
>>>                            sbrec_port_binding_by_name,
>>> -                           sbrec_mac_binding_by_lport_ip, br_int, chassis,
>>> +                           sbrec_mac_binding_by_lport_ip,
>>> +                           sbrec_fdb_by_dp_and_port, br_int, chassis,
>>>                            local_datapaths, active_tunnels, ovs_table);
>>>     prepare_ipv6_ras(local_active_ports_ras, sbrec_port_binding_by_name);
>>>     prepare_ipv6_prefixd(ovnsb_idl_txn, sbrec_port_binding_by_name,
>>> @@ -5035,6 +5036,7 @@ struct garp_rarp_data {
>>>                                   * announcement (in msecs). */
>>>     uint32_t dp_key;             /* Datapath used to output this GARP. */
>>>     uint32_t port_key;           /* Port to inject the GARP into. */
>>> +    bool enabled;                /* is garp/rarp announcement enabled */
>>> };
>>>
>>> /* Contains GARPs/RARPs to be sent. Protected by pinctrl_mutex*/
>>> @@ -5055,7 +5057,7 @@ destroy_send_garps_rarps(void)
>>> /* Runs with in the main ovn-controller thread context. */
>>> static void
>>> add_garp_rarp(const char *name, const struct eth_addr ea, ovs_be32 ip,
>>> -              uint32_t dp_key, uint32_t port_key)
>>> +              uint32_t dp_key, uint32_t port_key, bool enabled)
>>> {
>>>     struct garp_rarp_data *garp_rarp = xmalloc(sizeof *garp_rarp);
>>>     garp_rarp->ea = ea;
>>> @@ -5064,6 +5066,7 @@ add_garp_rarp(const char *name, const struct eth_addr 
>>> ea, ovs_be32 ip,
>>>     garp_rarp->backoff = 1000; /* msec. */
>>>     garp_rarp->dp_key = dp_key;
>>>     garp_rarp->port_key = port_key;
>>> +    garp_rarp->enabled = enabled;
>>>     shash_add(&send_garp_rarp_data, name, garp_rarp);
>>>
>>>     /* Notify pinctrl_handler so that it can wakeup and process
>>> @@ -5082,6 +5085,8 @@ send_garp_rarp_update(struct ovsdb_idl_txn 
>>> *ovnsb_idl_txn,
>>>                       bool garp_continuous)
>>> {
>>>     volatile struct garp_rarp_data *garp_rarp = NULL;
>>> +    bool is_garp_rarp_enabled = !smap_get_bool(&binding_rec->options,
>>> +                                               "disable_garp_rarp", false);
>>>
>>>     /* Skip localports as they don't need to be announced */
>>>     if (!strcmp(binding_rec->type, "localport")) {
>>> @@ -5105,6 +5110,7 @@ send_garp_rarp_update(struct ovsdb_idl_txn 
>>> *ovnsb_idl_txn,
>>>                 if (garp_rarp) {
>>>                     garp_rarp->dp_key = binding_rec->datapath->tunnel_key;
>>>                     garp_rarp->port_key = binding_rec->tunnel_key;
>>> +                    garp_rarp->enabled = is_garp_rarp_enabled;
>>>                     if (garp_max_timeout != garp_rarp_max_timeout ||
>>>                         garp_continuous != garp_rarp_continuous) {
>>>                         /* reset backoff */
>>> @@ -5115,7 +5121,8 @@ send_garp_rarp_update(struct ovsdb_idl_txn 
>>> *ovnsb_idl_txn,
>>>                     add_garp_rarp(name, laddrs->ea,
>>>                                   laddrs->ipv4_addrs[i].addr,
>>>                                   binding_rec->datapath->tunnel_key,
>>> -                                  binding_rec->tunnel_key);
>>> +                                  binding_rec->tunnel_key,
>>> +                                  is_garp_rarp_enabled);
>>>                     send_garp_locally(ovnsb_idl_txn,
>>>                                       sbrec_mac_binding_by_lport_ip,
>>>                                       local_datapaths, binding_rec, 
>>> laddrs->ea,
>>> @@ -5135,6 +5142,7 @@ send_garp_rarp_update(struct ovsdb_idl_txn 
>>> *ovnsb_idl_txn,
>>>                     if (garp_rarp) {
>>>                         garp_rarp->dp_key = 
>>> binding_rec->datapath->tunnel_key;
>>>                         garp_rarp->port_key = binding_rec->tunnel_key;
>>> +                        garp_rarp->enabled = is_garp_rarp_enabled;
>>>                         if (garp_max_timeout != garp_rarp_max_timeout ||
>>>                             garp_continuous != garp_rarp_continuous) {
>>>                             /* reset backoff */
>>> @@ -5144,7 +5152,8 @@ send_garp_rarp_update(struct ovsdb_idl_txn 
>>> *ovnsb_idl_txn,
>>>                     } else {
>>>                         add_garp_rarp(name, laddrs->ea,
>>>                                       0, binding_rec->datapath->tunnel_key,
>>> -                                      binding_rec->tunnel_key);
>>> +                                      binding_rec->tunnel_key,
>>> +                                      is_garp_rarp_enabled);
>>>                     }
>>>                     free(name);
>>>             }
>>> @@ -5160,6 +5169,7 @@ send_garp_rarp_update(struct ovsdb_idl_txn 
>>> *ovnsb_idl_txn,
>>>     if (garp_rarp) {
>>>         garp_rarp->dp_key = binding_rec->datapath->tunnel_key;
>>>         garp_rarp->port_key = binding_rec->tunnel_key;
>>> +        garp_rarp->enabled = is_garp_rarp_enabled;
>>>         if (garp_max_timeout != garp_rarp_max_timeout ||
>>>             garp_continuous != garp_rarp_continuous) {
>>>             /* reset backoff */
>>> @@ -5185,7 +5195,8 @@ send_garp_rarp_update(struct ovsdb_idl_txn 
>>> *ovnsb_idl_txn,
>>>         add_garp_rarp(binding_rec->logical_port,
>>>                       laddrs.ea, ip,
>>>                       binding_rec->datapath->tunnel_key,
>>> -                      binding_rec->tunnel_key);
>>> +                      binding_rec->tunnel_key,
>>> +                      is_garp_rarp_enabled);
>>>         if (ip) {
>>>             send_garp_locally(ovnsb_idl_txn, sbrec_mac_binding_by_lport_ip,
>>>                               local_datapaths, binding_rec, laddrs.ea, ip);
>>> @@ -6548,6 +6559,10 @@ send_garp_rarp_run(struct rconn *swconn, long long 
>>> int *send_garp_rarp_time)
>>>     long long int current_time = time_msec();
>>>     *send_garp_rarp_time = LLONG_MAX;
>>>     SHASH_FOR_EACH (iter, &send_garp_rarp_data) {
>>> +        struct garp_rarp_data *garp_rarp = iter->data;
>>> +        if (!garp_rarp->enabled) {
>>> +            continue;
>>> +        }
>>>         long long int next_announce = send_garp_rarp(swconn, iter->data,
>>>                                                      current_time);
>>>         if (*send_garp_rarp_time > next_announce) {
>>> @@ -6563,6 +6578,7 @@ send_garp_rarp_prepare(struct ovsdb_idl_txn 
>>> *ovnsb_idl_txn,
>>>                        struct ovsdb_idl_index 
>>> *sbrec_port_binding_by_datapath,
>>>                        struct ovsdb_idl_index *sbrec_port_binding_by_name,
>>>                        struct ovsdb_idl_index 
>>> *sbrec_mac_binding_by_lport_ip,
>>> +                       struct ovsdb_idl_index *sbrec_fdb_by_dp_and_port,
>>>                        const struct ovsrec_bridge *br_int,
>>>                        const struct sbrec_chassis *chassis,
>>>                        const struct hmap *local_datapaths,
>>> @@ -6598,12 +6614,18 @@ send_garp_rarp_prepare(struct ovsdb_idl_txn 
>>> *ovnsb_idl_txn,
>>>                                &nat_ip_keys, &local_l3gw_ports,
>>>                                chassis, active_tunnels,
>>>                                &nat_addresses);
>>> +
>>>     /* For deleted ports and deleted nat ips, remove from
>>>      * send_garp_rarp_data. */
>>>     struct shash_node *iter;
>>>     SHASH_FOR_EACH_SAFE (iter, &send_garp_rarp_data) {
>>>         if (!sset_contains(&localnet_vifs, iter->name) &&
>>>             !sset_contains(&nat_ip_keys, iter->name)) {
>>> +            struct garp_rarp_data *data = iter->data;
>>> +            /* Cleanup FDB entries for inactive ports */
>>> +            delete_fdb_entries(sbrec_fdb_by_dp_and_port,
>>> +                               data->dp_key,
>>> +                               data->port_key);
>>>             send_garp_rarp_delete(iter->name);
>>>         }
>>>     }
>>> @@ -6613,7 +6635,7 @@ send_garp_rarp_prepare(struct ovsdb_idl_txn 
>>> *ovnsb_idl_txn,
>>>     SSET_FOR_EACH (iface_id, &localnet_vifs) {
>>>         const struct sbrec_port_binding *pb = lport_lookup_by_name(
>>>             sbrec_port_binding_by_name, iface_id);
>>> -        if (pb && !smap_get_bool(&pb->options, "disable_garp_rarp", 
>>> false)) {
>>> +        if (pb) {
>>>             send_garp_rarp_update(ovnsb_idl_txn,
>>>                                   sbrec_mac_binding_by_lport_ip,
>>>                                   local_datapaths, pb, &nat_addresses,
>>> @@ -6626,7 +6648,7 @@ send_garp_rarp_prepare(struct ovsdb_idl_txn 
>>> *ovnsb_idl_txn,
>>>     SSET_FOR_EACH (gw_port, &local_l3gw_ports) {
>>>         const struct sbrec_port_binding *pb
>>>             = lport_lookup_by_name(sbrec_port_binding_by_name, gw_port);
>>> -        if (pb && !smap_get_bool(&pb->options, "disable_garp_rarp", 
>>> false)) {
>>> +        if (pb) {
>>>             send_garp_rarp_update(ovnsb_idl_txn, 
>>> sbrec_mac_binding_by_lport_ip,
>>>                                   local_datapaths, pb, &nat_addresses,
>>>                                   garp_max_timeout, garp_continuous);
>>> @@ -8884,22 +8906,6 @@ destroy_fdb_entries(void)
>>>     hmap_destroy(&put_fdbs);
>>> }
>>>
>>> -static const struct sbrec_fdb *
>>> -fdb_lookup(struct ovsdb_idl_index *sbrec_fdb_by_dp_key_mac, uint32_t 
>>> dp_key,
>>> -           const char *mac)
>>> -{
>>> -    struct sbrec_fdb *fdb = 
>>> sbrec_fdb_index_init_row(sbrec_fdb_by_dp_key_mac);
>>> -    sbrec_fdb_index_set_dp_key(fdb, dp_key);
>>> -    sbrec_fdb_index_set_mac(fdb, mac);
>>> -
>>> -    const struct sbrec_fdb *retval
>>> -        = sbrec_fdb_index_find(sbrec_fdb_by_dp_key_mac, fdb);
>>> -
>>> -    sbrec_fdb_index_destroy_row(fdb);
>>> -
>>> -    return retval;
>>> -}
>>> -
>>> static void
>>> run_put_fdb(struct ovsdb_idl_txn *ovnsb_idl_txn,
>>>             struct ovsdb_idl_index *sbrec_fdb_by_dp_key_mac,
>>> diff --git a/controller/pinctrl.h b/controller/pinctrl.h
>>> index 3462b670c..6613c87e4 100644
>>> --- a/controller/pinctrl.h
>>> +++ b/controller/pinctrl.h
>>> @@ -49,6 +49,7 @@ void pinctrl_run(struct ovsdb_idl_txn *ovnsb_idl_txn,
>>>                  struct ovsdb_idl_index *sbrec_igmp_groups,
>>>                  struct ovsdb_idl_index *sbrec_ip_multicast_opts,
>>>                  struct ovsdb_idl_index *sbrec_fdb_by_dp_key_mac,
>>> +                 struct ovsdb_idl_index *sbrec_fdb_by_dp_and_port,
>>>                  const struct sbrec_dns_table *,
>>>                  const struct sbrec_controller_event_table *,
>>>                  const struct sbrec_service_monitor_table *,
>>> diff --git a/lib/automake.mk b/lib/automake.mk
>>> index b69e854b0..3ff098331 100644
>>> --- a/lib/automake.mk
>>> +++ b/lib/automake.mk
>>> @@ -49,7 +49,9 @@ lib_libovn_la_SOURCES = \
>>>       lib/stopwatch-names.h \
>>>       lib/vif-plug-provider.h \
>>>       lib/vif-plug-provider.c \
>>> -     lib/vif-plug-providers/dummy/vif-plug-dummy.c
>>> +     lib/vif-plug-providers/dummy/vif-plug-dummy.c \
>>> +     lib/fdb.c \
>>> +     lib/fdb.h
>>> nodist_lib_libovn_la_SOURCES = \
>>>       lib/ovn-dirs.c \
>>>       lib/ovn-nb-idl.c \
>>> diff --git a/lib/fdb.c b/lib/fdb.c
>>> new file mode 100644
>>> index 000000000..80e20ab30
>>> --- /dev/null
>>> +++ b/lib/fdb.c
>>> @@ -0,0 +1,49 @@
>>> +/* Copyright (c) 2024, Nutanix, 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:
>>> + *
>>> + *     
>>> https://urldefense.proofpoint.com/v2/url?u=http-3A__www.apache.org_licenses_LICENSE-2D2.0&d=DwIDaQ&c=s883GpUCOChKOHiocYtGcg&r=awcqDnvm2rXKiid0_aQK6D2Z4I6GarSRmeHuqVFlgU4&m=F4flTSTYKNPVq5Eau3mplM6mfgyThPJ5ZT0ICWUBdhb_pL5ghHlPkhnMuKNoosl2&s=srv3gwmIA7FL8JMhHQnpZ4ZLgScyOLrRArOA498kSZo&e=
>>> + *
>>> + * 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 "lib/fdb.h"
>>> +
>>> +void
>>> +delete_fdb_entries(struct ovsdb_idl_index *sbrec_fdb_by_dp_and_port,
>>> +                   uint32_t dp_key, uint32_t port_key)
>>> +{
>>> +    struct sbrec_fdb *target =
>>> +        sbrec_fdb_index_init_row(sbrec_fdb_by_dp_and_port);
>>> +    sbrec_fdb_index_set_dp_key(target, dp_key);
>>> +    sbrec_fdb_index_set_port_key(target, port_key);
>>> +
>>> +    struct sbrec_fdb *fdb_e;
>>> +    SBREC_FDB_FOR_EACH_EQUAL (fdb_e, target, sbrec_fdb_by_dp_and_port) {
>>> +        sbrec_fdb_delete(fdb_e);
>>> +    }
>>> +    sbrec_fdb_index_destroy_row(target);
>>> +}
>>> +
>>> +const struct sbrec_fdb *
>>> +fdb_lookup(struct ovsdb_idl_index *sbrec_fdb_by_dp_key_mac, uint32_t 
>>> dp_key,
>>> +           const char *mac)
>>> +{
>>> +    struct sbrec_fdb *fdb = 
>>> sbrec_fdb_index_init_row(sbrec_fdb_by_dp_key_mac);
>>> +    sbrec_fdb_index_set_dp_key(fdb, dp_key);
>>> +    sbrec_fdb_index_set_mac(fdb, mac);
>>> +
>>> +    const struct sbrec_fdb *retval
>>> +        = sbrec_fdb_index_find(sbrec_fdb_by_dp_key_mac, fdb);
>>> +
>>> +    sbrec_fdb_index_destroy_row(fdb);
>>> +
>>> +    return retval;
>>> +}
>>> diff --git a/lib/fdb.h b/lib/fdb.h
>>> new file mode 100644
>>> index 000000000..b214ce626
>>> --- /dev/null
>>> +++ b/lib/fdb.h
>>> @@ -0,0 +1,29 @@
>>> +/* Copyright (c) 2024, Nutanix, 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:
>>> + *
>>> + *     
>>> https://urldefense.proofpoint.com/v2/url?u=http-3A__www.apache.org_licenses_LICENSE-2D2.0&d=DwIDaQ&c=s883GpUCOChKOHiocYtGcg&r=awcqDnvm2rXKiid0_aQK6D2Z4I6GarSRmeHuqVFlgU4&m=F4flTSTYKNPVq5Eau3mplM6mfgyThPJ5ZT0ICWUBdhb_pL5ghHlPkhnMuKNoosl2&s=srv3gwmIA7FL8JMhHQnpZ4ZLgScyOLrRArOA498kSZo&e=
>>> + *
>>> + * 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.
>>> + */
>>> +
>>> +#ifndef OVN_FDB_H
>>> +#define OVN_FDB_H 1
>>> +
>>> +#include "ovsdb-idl.h"
>>> +#include "ovn-sb-idl.h"
>>> +
>>> +void
>>> +delete_fdb_entries(struct ovsdb_idl_index *sbrec_fdb_by_dp_and_port,
>>> +                   uint32_t dp_key, uint32_t port_key);
>>> +const struct sbrec_fdb *
>>> +fdb_lookup(struct ovsdb_idl_index *sbrec_fdb_by_dp_key_mac,
>>> +           uint32_t dp_key, const char *mac);
>>> +
>>> +#endif
>>> diff --git a/northd/northd.c b/northd/northd.c
>>> index a267cd5f8..793641662 100644
>>> --- a/northd/northd.c
>>> +++ b/northd/northd.c
>>> @@ -42,6 +42,7 @@
>>> #include "lib/ovn-sb-idl.h"
>>> #include "lib/ovn-util.h"
>>> #include "lib/lb.h"
>>> +#include "lib/fdb.h"
>>> #include "lflow-mgr.h"
>>> #include "memory.h"
>>> #include "northd.h"
>>> @@ -3398,22 +3399,6 @@ cleanup_stale_fdb_entries(const struct 
>>> sbrec_fdb_table *sbrec_fdb_table,
>>>     }
>>> }
>>>
>>> -static void
>>> -delete_fdb_entries(struct ovsdb_idl_index *sbrec_fdb_by_dp_and_port,
>>> -                 uint32_t dp_key, uint32_t port_key)
>>> -{
>>> -    struct sbrec_fdb *target =
>>> -        sbrec_fdb_index_init_row(sbrec_fdb_by_dp_and_port);
>>> -    sbrec_fdb_index_set_dp_key(target, dp_key);
>>> -    sbrec_fdb_index_set_port_key(target, port_key);
>>> -
>>> -    struct sbrec_fdb *fdb_e;
>>> -    SBREC_FDB_FOR_EACH_EQUAL (fdb_e, target, sbrec_fdb_by_dp_and_port) {
>>> -        sbrec_fdb_delete(fdb_e);
>>> -    }
>>> -    sbrec_fdb_index_destroy_row(target);
>>> -}
>>> -
>>> struct service_monitor_info {
>>>     struct hmap_node hmap_node;
>>>     const struct sbrec_service_monitor *sbrec_mon;
>>> diff --git a/tests/ovn.at b/tests/ovn.at
>>> index 4b6e8132f..2b4346814 100644
>>> --- a/tests/ovn.at
>>> +++ b/tests/ovn.at
>>> @@ -31794,6 +31794,56 @@ OVN_CLEANUP([hv1], [hv2], [hv3])
>>> AT_CLEANUP
>>> ])
>>>
>>> +OVN_FOR_EACH_NORTHD([
>>> +AT_SETUP([FDB cleanup when vif goes down])
>>> +ovn_start
>>> +
>>> +net_add n1
>>> +
>>> +check ovn-nbctl ls-add ls0
>>> +
>>> +check ovn-nbctl lsp-add ls0 ln_port
>>> +check ovn-nbctl lsp-set-addresses ln_port unknown
>>> +check ovn-nbctl lsp-set-type ln_port localnet
>>> +check ovn-nbctl lsp-set-options ln_port network_name=physnet1
>>> +check ovn-nbctl set logical_switch_port ln_port 
>>> options:localnet_learn_fdb=true
>>> +
>>> +check ovn-nbctl lsp-add ls0 vif0
>>> +check ovn-nbctl lsp-set-addresses vif0 "00:00:00:00:10:10 192.168.10.10" 
>>> unknown
>>> +
>>> +sim_add hv1
>>> +as hv1
>>> +check ovs-vsctl add-br br-phys
>>> +ovn_attach n1 br-phys 192.168.0.1
>>> +check ovs-vsctl -- add-port br-int vif0 -- \
>>> +    set interface vif0 external-ids:iface-id=vif0
>>> +check ovs-vsctl -- add-port br-phys ext0
>>> +check ovs-vsctl set open . 
>>> external_ids:ovn-bridge-mappings=physnet1:br-phys
>>> +
>>> +wait_for_ports_up
>>> +check ovn-nbctl --wait=hv sync
>>> +ls0_key=$(fetch_column datapath_binding tunnel_key external_ids:name=ls0)
>>> +vif0_key=$(fetch_column port_binding tunnel_key logical_port=vif0)
>>> +
>>> +ovn-sbctl create FDB mac="00\:00\:00\:00\:10\:10" dp_key=$ls0_key 
>>> port_key=$vif0_key
>>> +ovn-sbctl create FDB mac="00\:00\:00\:00\:20\:20" dp_key=$ls0_key 
>>> port_key=$vif0_key
>>> +wait_row_count sb:FDB 2
>>> +check ovn-nbctl --wait=hv sync
>>> +
>>> +# vif going down should purge all relevant FDB entries
>>> +ovs-vsctl del-port br-int vif0
>>> +OVS_WAIT_UNTIL([test x`ovn-nbctl lsp-get-up vif0` = xdown])
>>> +check ovn-nbctl --wait=hv sync
>>> +wait_row_count sb:FDB 0 mac="00:00:00:00:10:10"
>>> +wait_row_count sb:FDB 0 mac="00:00:00:00:20:20"
>>> +
>>> +# vif0 should not be a local datapath in hv1 as vif0 is down
>>> +# Hence ln_port should not be a related port.
>>> +OVN_CLEANUP([hv1
>>> +ln_port])
>>> +AT_CLEANUP
>>> +])
>>> +
>>> OVN_FOR_EACH_NORTHD([
>>> AT_SETUP([container port changed to normal port and then deleted])
>>> ovn_start
>>> --
>>> 2.22.3
>>>
>>
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