The localnet is excluded from MAC learning for scale
reason. However there might be a valid workflow
when yo uwant to enable the learning and benefit
for that for HW offload. Add option called
'localnet_learn_fdb' to LSP, which will enable/disable
the learning. Setting it as disabled by default.

Reported-at: https://bugzilla.redhat.com/2070529
Signed-off-by: Ales Musil <[email protected]>
---
 northd/northd.c     | 10 ++++++++--
 ovn-nb.xml          |  7 +++++++
 ovn-sb.xml          |  1 +
 tests/ovn-northd.at | 37 +++++++++++++++++++++++++++++++++++++
 4 files changed, 53 insertions(+), 2 deletions(-)

diff --git a/northd/northd.c b/northd/northd.c
index 16ea7a6aa..b3077714e 100644
--- a/northd/northd.c
+++ b/northd/northd.c
@@ -5408,8 +5408,14 @@ build_lswitch_learn_fdb_op(
         struct ovn_port *op, struct hmap *lflows,
         struct ds *actions, struct ds *match)
 {
-    if (op->nbsp && !op->n_ps_addrs && !strcmp(op->nbsp->type, "") &&
-        op->has_unknown) {
+    if (!op->nbsp) {
+        return;
+    }
+
+    bool localnet_learn_fdb = smap_get_bool(&op->nbsp->options,
+                                            "localnet_learn_fdb", false);
+    if (!op->n_ps_addrs && op->has_unknown && (!strcmp(op->nbsp->type, "") ||
+        (localnet_learn_fdb && lsp_is_localnet(op->nbsp)))) {
         ds_clear(match);
         ds_clear(actions);
         ds_put_format(match, "inport == %s", op->json_key);
diff --git a/ovn-nb.xml b/ovn-nb.xml
index 3e3e142b3..9df6b1aab 100644
--- a/ovn-nb.xml
+++ b/ovn-nb.xml
@@ -976,6 +976,13 @@
           headers. Supported values: 802.11q (default), 802.11ad.
         </column>
 
+        <column name="options" key="localnet_learn_fdb"
+                type='{"type": "boolean"}'>
+          Optional. Allows localnet port to learn MACs and store them in FDB
+          table if set to <code>true</code>. The default value is
+          <code>false</code>.
+        </column>
+
       </group>
 
       <group title="Options for l2gateway ports">
diff --git a/ovn-sb.xml b/ovn-sb.xml
index 4c35dda36..3d92ba88f 100644
--- a/ovn-sb.xml
+++ b/ovn-sb.xml
@@ -4602,6 +4602,7 @@ tcp.flags = RST;
   <table name="FDB" title="Port to MAC bindings">
     <p>
       This table is primarily used to learn the MACs observed on a VIF
+      (or a localnet port with 'localnet_learn_fdb' enabled)
       which belongs to a <code>Logical_Switch_Port</code> record in
       <code>OVN_Northbound</code> whose port security is disabled
       and 'unknown' address set.  If port security is disabled on a
diff --git a/tests/ovn-northd.at b/tests/ovn-northd.at
index 5bd0935e7..89eeb0894 100644
--- a/tests/ovn-northd.at
+++ b/tests/ovn-northd.at
@@ -7418,3 +7418,40 @@ AT_CHECK([cat sw0flows | grep -e port_sec | sort | sed 
's/table=./table=?/' ], [
 
 AT_CLEANUP
 ])
+
+OVN_FOR_EACH_NORTHD([
+AT_SETUP([Localnet MAC learning option])
+ovn_start
+
+AT_CHECK([ovn-nbctl ls-add ls0])
+
+AT_CHECK([ovn-nbctl lsp-add ls0 ln_port])
+AT_CHECK([ovn-nbctl lsp-set-addresses ln_port unknown])
+AT_CHECK([ovn-nbctl lsp-set-type ln_port localnet])
+AT_CHECK([ovn-nbctl lsp-set-options ln_port network_name=phys])
+AT_CHECK([ovn-nbctl --wait=sb sync])
+
+# Check MAC learning flows with 'localnet_learn_fdb' default (false)
+AT_CHECK([ovn-sbctl dump-flows ls0 | grep -e 'ls_in_\(put\|lookup\)_fdb' | 
sort | sed 's/table=./table=?/'], [0], [dnl
+  table=? (ls_in_lookup_fdb   ), priority=0    , match=(1), action=(next;)
+  table=? (ls_in_put_fdb      ), priority=0    , match=(1), action=(next;)
+])
+
+# Enable 'localnet_learn_fdb' and check the flows
+AT_CHECK([ovn-nbctl --wait=sb lsp-set-options ln_port localnet_learn_fdb=true])
+AT_CHECK([ovn-sbctl dump-flows ls0 | grep -e 'ls_in_\(put\|lookup\)_fdb' | 
sort | sed 's/table=./table=?/'], [0], [dnl
+  table=? (ls_in_lookup_fdb   ), priority=0    , match=(1), action=(next;)
+  table=? (ls_in_lookup_fdb   ), priority=100  , match=(inport == "ln_port"), 
action=(reg0[[11]] = lookup_fdb(inport, eth.src); next;)
+  table=? (ls_in_put_fdb      ), priority=0    , match=(1), action=(next;)
+  table=? (ls_in_put_fdb      ), priority=100  , match=(inport == "ln_port" && 
reg0[[11]] == 0), action=(put_fdb(inport, eth.src); next;)
+])
+
+# Disable 'localnet_learn_fdb' and check the flows
+AT_CHECK([ovn-nbctl --wait=sb lsp-set-options ln_port 
localnet_learn_fdb=false])
+AT_CHECK([ovn-sbctl dump-flows ls0 | grep -e 'ls_in_\(put\|lookup\)_fdb' | 
sort | sed 's/table=./table=?/'], [0], [dnl
+  table=? (ls_in_lookup_fdb   ), priority=0    , match=(1), action=(next;)
+  table=? (ls_in_put_fdb      ), priority=0    , match=(1), action=(next;)
+])
+
+AT_CLEANUP
+])
-- 
2.35.3

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