nfp: remove phys_port_name on flower's vNIC

.ndo_get_phys_port_name was recently extended to support multi-vNIC
FWs.  These are firmwares which can have more than one vNIC per PF
without associated port (e.g. Adaptive Buffer Management FW), therefore
we need a way of distinguishing the vNICs.  Unfortunately, it's too
late to make flower use the same naming.  Flower users may depend on
.ndo_get_phys_port_name returning -EOPNOTSUPP, for example the name
udev gave the PF vNIC was just the bare PCI device-based name before
the change, and will have 'nn0' appended after.

To ensure flower's vNIC doesn't have phys_port_name attribute, add
a flag to vNIC struct and set it in flower code.  New projects will
not set the flag adhere to the naming scheme from the start.

Fixes: 51c1df83 ("nfp: assign vNIC id as phys_port_name of vNICs which are not ports")
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Dirk van der Merwe <dirk.vandermerwe@netronome.com>
Reviewed-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/netronome/nfp/flower/main.c

@@ -455,6 +455,7 @@ static int nfp_flower_vnic_alloc(struct nfp_app *app, struct nfp_net *nn,
 
 	eth_hw_addr_random(nn->dp.netdev);
 	netif_keep_dst(nn->dp.netdev);
+	nn->vnic_no_name = true;
 
 	return 0;
 

drivers/net/ethernet/netronome/nfp/nfp_net.h

@@ -590,6 +590,8 @@ struct nfp_net_dp {
  * @vnic_list:		Entry on device vNIC list
  * @pdev:		Backpointer to PCI device
  * @app:		APP handle if available
+ * @vnic_no_name:	For non-port PF vNIC make ndo_get_phys_port_name return
+ *			-EOPNOTSUPP to keep backwards compatibility (set by app)
  * @port:		Pointer to nfp_port structure if vNIC is a port
  * @app_priv:		APP private data for this vNIC
  */
@@ -663,6 +665,8 @@ struct nfp_net {
 	struct pci_dev *pdev;
 	struct nfp_app *app;
 
+	bool vnic_no_name;
+
 	struct nfp_port *port;
 
 	void *app_priv;

drivers/net/ethernet/netronome/nfp/nfp_net_common.c

@@ -3286,7 +3286,7 @@ nfp_net_get_phys_port_name(struct net_device *netdev, char *name, size_t len)
 	if (nn->port)
 		return nfp_port_get_phys_port_name(netdev, name, len);
 
-	if (nn->dp.is_vf)
+	if (nn->dp.is_vf || nn->vnic_no_name)
 		return -EOPNOTSUPP;
 
 	n = snprintf(name, len, "n%d", nn->id);