update ifindex/vlan info unconditionally in the map in vlan_learning example

Signed-off-by: Yonghong Song <yhs@plumgrid.com>

examples/vlan_learning.c

@@ -33,14 +33,10 @@ int handle_phys2virt(struct __sk_buff *skb) {
       int out_ifindex = leaf->out_ifindex;
       struct ifindex_leaf_t zleaf = {0};
       struct ifindex_leaf_t *out_leaf = egress.lookup_or_init(&out_ifindex, &zleaf);
-      // relearn when mac moves ifindex
-      if (out_leaf->out_ifindex != skb->ifindex)
-        out_leaf->out_ifindex = skb->ifindex;
-      // relearn when vlan_tci/vlan_proto changes
-      if (out_leaf->vlan_tci != skb->vlan_tci)
-        out_leaf->vlan_tci = skb->vlan_tci;
-      if (out_leaf->vlan_proto != skb->vlan_proto)
-        out_leaf->vlan_proto = skb->vlan_proto;
+      // to capture potential configuration changes
+      out_leaf->out_ifindex = skb->ifindex;
+      out_leaf->vlan_tci = skb->vlan_tci;
+      out_leaf->vlan_proto = skb->vlan_proto;
       // pop the vlan header and send to the destination
       bpf_skb_vlan_pop(skb);
       bpf_clone_redirect(skb, leaf->out_ifindex, 0);