net: lan966x: add tc matchall goto action

Extend matchall with action goto. This is needed to enable the lookup in
the VCAP. It is needed to connect chain 0 to a chain that is recognized
by the HW.
Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

drivers/net/ethernet/microchip/lan966x/Makefile

@@ -13,7 +13,7 @@ lan966x-switch-objs  := lan966x_main.o lan966x_phylink.o lan966x_port.o \
 			lan966x_tbf.o lan966x_cbs.o lan966x_ets.o \
 			lan966x_tc_matchall.o lan966x_police.o lan966x_mirror.o \
 			lan966x_xdp.o lan966x_vcap_impl.o lan966x_vcap_ag_api.o \
-			lan966x_tc_flower.o
+			lan966x_tc_flower.o lan966x_goto.o
 
 # Provide include files
 ccflags-y += -I$(srctree)/drivers/net/ethernet/microchip/vcap

drivers/net/ethernet/microchip/lan966x/lan966x_goto.c

+// SPDX-License-Identifier: GPL-2.0+
+
+#include "lan966x_main.h"
+#include "vcap_api_client.h"
+
+int lan966x_goto_port_add(struct lan966x_port *port,
+			  struct flow_action_entry *act,
+			  unsigned long goto_id,
+			  struct netlink_ext_ack *extack)
+{
+	struct lan966x *lan966x = port->lan966x;
+	int err;
+
+	err = vcap_enable_lookups(lan966x->vcap_ctrl, port->dev,
+				  act->chain_index, goto_id,
+				  true);
+	if (err == -EFAULT) {
+		NL_SET_ERR_MSG_MOD(extack, "Unsupported goto chain");
+		return -EOPNOTSUPP;
+	}
+
+	if (err == -EADDRINUSE) {
+		NL_SET_ERR_MSG_MOD(extack, "VCAP already enabled");
+		return -EOPNOTSUPP;
+	}
+
+	if (err) {
+		NL_SET_ERR_MSG_MOD(extack, "Could not enable VCAP lookups");
+		return err;
+	}
+
+	port->tc.goto_id = goto_id;
+
+	return 0;
+}
+
+int lan966x_goto_port_del(struct lan966x_port *port,
+			  unsigned long goto_id,
+			  struct netlink_ext_ack *extack)
+{
+	struct lan966x *lan966x = port->lan966x;
+	int err;
+
+	err = vcap_enable_lookups(lan966x->vcap_ctrl, port->dev, 0,
+				  goto_id, false);
+	if (err) {
+		NL_SET_ERR_MSG_MOD(extack, "Could not disable VCAP lookups");
+		return err;
+	}
+
+	port->tc.goto_id = 0;
+
+	return 0;
+}

drivers/net/ethernet/microchip/lan966x/lan966x_main.h

@@ -320,6 +320,7 @@ struct lan966x_port_tc {
 	unsigned long police_id;
 	unsigned long ingress_mirror_id;
 	unsigned long egress_mirror_id;
+	unsigned long goto_id;
 	struct flow_stats police_stat;
 	struct flow_stats mirror_stat;
 };
@@ -591,6 +592,14 @@ void lan966x_vcap_deinit(struct lan966x *lan966x);
 int lan966x_tc_flower(struct lan966x_port *port,
 		      struct flow_cls_offload *f);
 
+int lan966x_goto_port_add(struct lan966x_port *port,
+			  struct flow_action_entry *act,
+			  unsigned long goto_id,
+			  struct netlink_ext_ack *extack);
+int lan966x_goto_port_del(struct lan966x_port *port,
+			  unsigned long goto_id,
+			  struct netlink_ext_ack *extack);
+
 static inline void __iomem *lan_addr(void __iomem *base[],
 				     int id, int tinst, int tcnt,
 				     int gbase, int ginst,

drivers/net/ethernet/microchip/lan966x/lan966x_tc_matchall.c

@@ -23,6 +23,9 @@ static int lan966x_tc_matchall_add(struct lan966x_port *port,
 	case FLOW_ACTION_MIRRED:
 		return lan966x_mirror_port_add(port, act, f->cookie,
 					       ingress, f->common.extack);
+	case FLOW_ACTION_GOTO:
+		return lan966x_goto_port_add(port, act, f->cookie,
+					     f->common.extack);
 	default:
 		NL_SET_ERR_MSG_MOD(f->common.extack,
 				   "Unsupported action");
@@ -43,6 +46,9 @@ static int lan966x_tc_matchall_del(struct lan966x_port *port,
 		   f->cookie == port->tc.egress_mirror_id) {
 		return lan966x_mirror_port_del(port, ingress,
 					       f->common.extack);
+	} else if (f->cookie == port->tc.goto_id) {
+		return lan966x_goto_port_del(port, f->cookie,
+					     f->common.extack);
 	} else {
 		NL_SET_ERR_MSG_MOD(f->common.extack,
 				   "Unsupported action");