[PATCH net] nfp: reintroduce ndo_get_port_parent_id for representor ports

[Jakub Kicinski]

From: Pieter Jansen van Vuuren <pieter.jansenvanvuu...@netronome.com>

NFP does not register devlink ports for representors (without
the "devlink: expose PF and VF representors as ports" series
there are no port flavours to expose them as).

Commit c25f08ac65e4 ("nfp: remove ndo_get_port_parent_id implementation")
went to far in removing ndo_get_port_parent_id for representors.
This causes redirection offloads to fail, and switch_id attribute
missing.

Reintroduce the ndo_get_port_parent_id callback for representor ports.

Fixes: c25f08ac65e4 ("nfp: remove ndo_get_port_parent_id implementation")
Signed-off-by: Pieter Jansen van Vuuren <pieter.jansenvanvuu...@netronome.com>
Signed-off-by: Jakub Kicinski <jakub.kicin...@netronome.com>
---
 .../net/ethernet/netronome/nfp/nfp_net_repr.c    |  1 +
 drivers/net/ethernet/netronome/nfp/nfp_port.c    | 16 ++++++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_repr.c 
b/drivers/net/ethernet/netronome/nfp/nfp_net_repr.c
index 036edcc1fa18..1eef446036d6 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_net_repr.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net_repr.c
@@ -273,6 +273,7 @@ const struct net_device_ops nfp_repr_netdev_ops = {
        .ndo_fix_features       = nfp_repr_fix_features,
        .ndo_set_features       = nfp_port_set_features,
        .ndo_set_mac_address    = eth_mac_addr,
+       .ndo_get_port_parent_id = nfp_port_get_port_parent_id,
        .ndo_get_devlink_port   = nfp_devlink_get_devlink_port,
 };
 
diff --git a/drivers/net/ethernet/netronome/nfp/nfp_port.c 
b/drivers/net/ethernet/netronome/nfp/nfp_port.c
index fcd16877e6e0..93c5bfc0510b 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_port.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_port.c
@@ -30,6 +30,22 @@ struct nfp_port *nfp_port_from_netdev(struct net_device 
*netdev)
        return NULL;
 }
 
+int nfp_port_get_port_parent_id(struct net_device *netdev,
+                               struct netdev_phys_item_id *ppid)
+{
+       struct nfp_port *port;
+       const u8 *serial;
+
+       port = nfp_port_from_netdev(netdev);
+       if (!port)
+               return -EOPNOTSUPP;
+
+       ppid->id_len = nfp_cpp_serial(port->app->cpp, &serial);
+       memcpy(&ppid->id, serial, ppid->id_len);
+
+       return 0;
+}
+
 int nfp_port_setup_tc(struct net_device *netdev, enum tc_setup_type type,
                      void *type_data)
 {
-- 
2.21.0