nfp: flower: support fallback packets from internal ports

FW may receive a packet with its ingress port marked as an internal port.
If a rule does not exist to match on this port, the packet will be sent to
the NFP driver. Modify the flower app to detect packets from such internal
ports and convert the ingress port to the correct kernel space netdev.

At this point, it is assumed that fallback packets from internal ports are
to be sent out said port. Therefore, set the redir_egress bool to true on
detection of these ports.
Signed-off-by: John Hurley <john.hurley@netronome.com>
Signed-off-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -91,6 +91,19 @@ u32 nfp_flower_get_port_id_from_netdev(struct nfp_app *app,
 	return 0;
 }
 
+static struct net_device *
+nfp_flower_get_netdev_from_internal_port_id(struct nfp_app *app, int port_id)
+{
+	struct nfp_flower_priv *priv = app->priv;
+	struct net_device *netdev;
+
+	rcu_read_lock();
+	netdev = idr_find(&priv->internal_ports.port_ids, port_id);
+	rcu_read_unlock();
+
+	return netdev;
+}
+
 static void
 nfp_flower_free_internal_port_id(struct nfp_app *app, struct net_device *netdev)
 {
@@ -216,12 +229,21 @@ nfp_flower_repr_get_type_and_port(struct nfp_app *app, u32 port_id, u8 *port)
 }
 
 static struct net_device *
-nfp_flower_repr_get(struct nfp_app *app, u32 port_id, bool *redir_egress)
+nfp_flower_dev_get(struct nfp_app *app, u32 port_id, bool *redir_egress)
 {
 	enum nfp_repr_type repr_type;
 	struct nfp_reprs *reprs;
 	u8 port = 0;
 
+	/* Check if the port is internal. */
+	if (FIELD_GET(NFP_FLOWER_CMSG_PORT_TYPE, port_id) ==
+	    NFP_FLOWER_CMSG_PORT_TYPE_OTHER_PORT) {
+		if (redir_egress)
+			*redir_egress = true;
+		port = FIELD_GET(NFP_FLOWER_CMSG_PORT_PHYS_PORT_NUM, port_id);
+		return nfp_flower_get_netdev_from_internal_port_id(app, port);
+	}
+
 	repr_type = nfp_flower_repr_get_type_and_port(app, port_id, &port);
 	if (repr_type > NFP_REPR_TYPE_MAX)
 		return NULL;
@@ -923,7 +945,7 @@ const struct nfp_app_type app_flower = {
 	.sriov_disable	= nfp_flower_sriov_disable,
 
 	.eswitch_mode_get  = eswitch_mode_get,
-	.dev_get	= nfp_flower_repr_get,
+	.dev_get	= nfp_flower_dev_get,
 
 	.setup_tc	= nfp_flower_setup_tc,
 };