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[ovs-dev,v5,2/2] northd: Add support for disabling vxlan mode.

Message ID 20240503081348.189608-3-odivlad@gmail.com
State New
Headers show
Series Add support to disable VXLAN mode. | expand

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Commit Message

Vladislav Odintsov May 3, 2024, 8:13 a.m. UTC 
Commit [1] introduced a "VXLAN mode" concept.  It brought a limitation
for available tunnel IDs because of lack of space in VXLAN VNI.
In VXLAN mode OVN is limited by 4095 datapaths (LRs or non-transit LSs)
and 2047 logical ports per datapath.

Prior to this patch VXLAN mode was enabled automatically if at least one
chassis had encap of VXLAN type.  In scenarios where one want to use
VXLAN only for HW VTEP (RAMP) switch, such limitation makes no sence.

This patch adds support for explicit disabling of VXLAN mode via
Northbound database.

1: https://github.com/ovn-org/ovn/commit/b07f1bc3d068

Acked-By: Ihar Hrachyshka <ihrachys@redhat.com>
Fixes: b07f1bc3d068 ("Add VXLAN support for non-VTEP datapath bindings")
Signed-off-by: Vladislav Odintsov <odivlad@gmail.com>
---
 NEWS                      |  4 ++++
 northd/en-global-config.c |  7 ++++++-
 northd/northd.c           | 10 ++++++++--
 northd/northd.h           |  3 ++-
 ovn-architecture.7.xml    |  6 ++++++
 ovn-nb.xml                | 10 ++++++++++
 tests/ovn-northd.at       | 29 +++++++++++++++++++++++++++++
 7 files changed, 65 insertions(+), 4 deletions(-)
diff mbox series

Patch

diff --git a/NEWS b/NEWS
index 3b5e93dc9..007b27f3d 100644
--- a/NEWS
+++ b/NEWS
@@ -17,6 +17,10 @@  Post v24.03.0
     external-ids, the option is no longer needed as it became effectively
     "true" for all scenarios.
   - Added DHCPv4 relay support.
+  - Added new global config option NB_Global:options:disable_vxlan_mode to
+    extend available tunnel IDs space for datapaths from 4095 to 16711680
+    when running in "VXLAN mode".  For more details see man ovn-nb(5) for
+    mentioned option.
 
 OVN v24.03.0 - 01 Mar 2024
 --------------------------
diff --git a/northd/en-global-config.c b/northd/en-global-config.c
index 873649a89..f5e2a8154 100644
--- a/northd/en-global-config.c
+++ b/northd/en-global-config.c
@@ -115,7 +115,7 @@  en_global_config_run(struct engine_node *node , void *data)
                      config_data->svc_monitor_mac);
     }
 
-    init_vxlan_mode(sbrec_chassis_table);
+    init_vxlan_mode(&nb->options, sbrec_chassis_table);
     char *max_tunid = xasprintf("%d", get_ovn_max_dp_key_local());
     smap_replace(options, "max_tunid", max_tunid);
     free(max_tunid);
@@ -533,6 +533,11 @@  check_nb_options_out_of_sync(const struct nbrec_nb_global *nb,
         return true;
     }
 
+    if (config_out_of_sync(&nb->options, &config_data->nb_options,
+                           "disable_vxlan_mode", false)) {
+        return true;
+    }
+
     return false;
 }
 
diff --git a/northd/northd.c b/northd/northd.c
index 0e0ae24db..7bdffe531 100644
--- a/northd/northd.c
+++ b/northd/northd.c
@@ -886,8 +886,14 @@  join_datapaths(const struct nbrec_logical_switch_table *nbrec_ls_table,
 }
 
 void
-init_vxlan_mode(const struct sbrec_chassis_table *sbrec_chassis_table)
+init_vxlan_mode(const struct smap *nb_options,
+                const struct sbrec_chassis_table *sbrec_chassis_table)
 {
+    if (smap_get_bool(nb_options, "disable_vxlan_mode", false)) {
+        vxlan_mode = false;
+        return;
+    }
+
     const struct sbrec_chassis *chassis;
     SBREC_CHASSIS_TABLE_FOR_EACH (chassis, sbrec_chassis_table) {
         for (int i = 0; i < chassis->n_encaps; i++) {
@@ -17596,7 +17602,7 @@  ovnnb_db_run(struct northd_input *input_data,
     use_common_zone = smap_get_bool(input_data->nb_options, "use_common_zone",
                                     false);
 
-    init_vxlan_mode(input_data->sbrec_chassis_table);
+    init_vxlan_mode(input_data->nb_options, input_data->sbrec_chassis_table);
 
     build_datapaths(ovnsb_txn,
                     input_data->nbrec_logical_switch_table,
diff --git a/northd/northd.h b/northd/northd.h
index be480003e..d0322e621 100644
--- a/northd/northd.h
+++ b/northd/northd.h
@@ -792,7 +792,8 @@  lr_has_multiple_gw_ports(const struct ovn_datapath *od)
 }
 
 void
-init_vxlan_mode(const struct sbrec_chassis_table *sbrec_chassis_table);
+init_vxlan_mode(const struct smap *nb_options,
+                const struct sbrec_chassis_table *sbrec_chassis_table);
 
 uint32_t get_ovn_max_dp_key_local(void);
 
diff --git a/ovn-architecture.7.xml b/ovn-architecture.7.xml
index 3ecb58933..f4eae340c 100644
--- a/ovn-architecture.7.xml
+++ b/ovn-architecture.7.xml
@@ -2920,4 +2920,10 @@ 
     the future, gateways that do not support encapsulations with large amounts
     of metadata may continue to have a reduced feature set.
   </p>
+  <p>
+    <code>VXLAN mode</code> is recommended to be disabled if VXLAN encap at
+    hypervisors is needed only to support HW VTEP L2 Gateway functionality.
+    See man ovn-nb(5) for table <code>NB_Global</code> column
+    <code>options</code> key <code>disable_vxlan_mode</code> for more details.
+  </p>
 </manpage>
diff --git a/ovn-nb.xml b/ovn-nb.xml
index 5cb6ba640..84f1e07b6 100644
--- a/ovn-nb.xml
+++ b/ovn-nb.xml
@@ -381,6 +381,16 @@ 
         of SB changes would be very noticeable.
       </column>
 
+      <column name="options" key="disable_vxlan_mode">
+        By default if at least one chassis in OVN cluster has VXLAN encap,
+        northd will run in a <code>VXLAN mode</code>. See man
+        ovn-architecture(7) <code>Tunnel Encapsulations</code> paragraph for
+        more details.  In case VXLAN encaps are needed on chassis only to
+        support HW VTEP functionality and main encap type is GENEVE or STT, set
+        this option to <code>false</code> to use default
+        non-<code>VXLAN mode</code> tunnel IDs allocation logic.
+      </column>
+
       <group title="Options for configuring interconnection route advertisement">
         <p>
           These options control how routes are advertised between OVN
diff --git a/tests/ovn-northd.at b/tests/ovn-northd.at
index 680d96675..9ddd7d177 100644
--- a/tests/ovn-northd.at
+++ b/tests/ovn-northd.at
@@ -2847,6 +2847,35 @@  AT_CHECK(
 get_tunnel_keys
 AT_CHECK([test $lsp02 = 3 && test $ls1 = 123])
 
+AT_CLEANUP
+])
+OVN_FOR_EACH_NORTHD_NO_HV([
+AT_SETUP([check VXLAN mode disabling])
+ovn_start
+
+# Create a fake chassis with vxlan encap to implicitly enable VXLAN mode.
+ovn-sbctl \
+    --id=@e create encap chassis_name=hv1 ip="192.168.0.1" type="vxlan" \
+    -- --id=@c create chassis name=hv1 encaps=@e
+
+cmd="ovn-nbctl --wait=sb"
+for i in {1..4097..1}; do
+    cmd="${cmd} -- ls-add lsw-${i}"
+done
+
+check $cmd
+
+check_row_count nb:Logical_Switch 4097
+wait_row_count sb:Datapath_Binding 4095
+
+OVS_WAIT_UNTIL([grep "all datapath tunnel ids exhausted" northd/ovn-northd.log])
+
+# Explicitly disable VXLAN mode and check that two remaining datapaths were created.
+check ovn-nbctl set NB_Global . options:disable_vxlan_mode=true
+
+check_row_count nb:Logical_Switch 4097
+wait_row_count sb:Datapath_Binding 4097
+
 AT_CLEANUP
 ])