Virtual interfaces like vports or dpdk vhost-user ports has no
proper ifindex, but could support some kind of offloading.

This is a prerequisite for tunneling vport offloading with DPDK
flow API.

Signed-off-by: Ilya Maximets <i.maxim...@ovn.org>
---
 lib/netdev-offload.c | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/lib/netdev-offload.c b/lib/netdev-offload.c
index 00fb083fc..ed4392f77 100644
--- a/lib/netdev-offload.c
+++ b/lib/netdev-offload.c
@@ -525,10 +525,6 @@ netdev_ports_insert(struct netdev *netdev, const char 
*dpif_type,
     struct port_to_netdev_data *data;
     int ifindex = netdev_get_ifindex(netdev);
 
-    if (ifindex < 0) {
-        return ENODEV;
-    }
-
     ovs_rwlock_wrlock(&netdev_hmap_rwlock);
     if (netdev_ports_lookup(dpif_port->port_no, dpif_type)) {
         ovs_rwlock_unlock(&netdev_hmap_rwlock);
@@ -538,13 +534,18 @@ netdev_ports_insert(struct netdev *netdev, const char 
*dpif_type,
     data = xzalloc(sizeof *data);
     data->netdev = netdev_ref(netdev);
     dpif_port_clone(&data->dpif_port, dpif_port);
-    data->ifindex = ifindex;
+
+    if (ifindex >= 0) {
+        data->ifindex = ifindex;
+        hmap_insert(&ifindex_to_port, &data->ifindex_node, ifindex);
+    } else {
+        data->ifindex = -1;
+    }
 
     netdev_set_dpif_type(netdev, dpif_type);
 
     hmap_insert(&port_to_netdev, &data->portno_node,
                 netdev_ports_hash(dpif_port->port_no, dpif_type));
-    hmap_insert(&ifindex_to_port, &data->ifindex_node, ifindex);
     ovs_rwlock_unlock(&netdev_hmap_rwlock);
 
     netdev_init_flow_api(netdev);
@@ -580,7 +581,9 @@ netdev_ports_remove(odp_port_t port_no, const char 
*dpif_type)
         dpif_port_destroy(&data->dpif_port);
         netdev_close(data->netdev); /* unref and possibly close */
         hmap_remove(&port_to_netdev, &data->portno_node);
-        hmap_remove(&ifindex_to_port, &data->ifindex_node);
+        if (data->ifindex >= 0) {
+            hmap_remove(&ifindex_to_port, &data->ifindex_node);
+        }
         free(data);
         ret = 0;
     }
-- 
2.17.1

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