net: marvell: prestera: Add prestera router infra

Add prestera_router.c, which contains code to subscribe/unsubscribe on
kernel notifiers for router. This handle kernel notifications,
parse structures to make key to manipulate prestera_router_hw's objects.

Also prestera_router is container for router's objects database.
Co-developed-by: Taras Chornyi <tchornyi@marvell.com>
Signed-off-by: Taras Chornyi <tchornyi@marvell.com>
Co-developed-by: Oleksandr Mazur <oleksandr.mazur@plvision.eu>
Signed-off-by: Oleksandr Mazur <oleksandr.mazur@plvision.eu>
Signed-off-by: Yevhen Orlov <yevhen.orlov@plvision.eu>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/marvell/prestera/Makefile

@@ -3,6 +3,7 @@ obj-$(CONFIG_PRESTERA)	+= prestera.o
 prestera-objs		:= prestera_main.o prestera_hw.o prestera_dsa.o \
 			   prestera_rxtx.o prestera_devlink.o prestera_ethtool.o \
 			   prestera_switchdev.o prestera_acl.o prestera_flow.o \
-			   prestera_flower.o prestera_span.o prestera_counter.o
+			   prestera_flower.o prestera_span.o prestera_counter.o \
+			   prestera_router.o
 
 obj-$(CONFIG_PRESTERA_PCI)	+= prestera_pci.o

drivers/net/ethernet/marvell/prestera/prestera.h

@@ -270,12 +270,20 @@ struct prestera_switch {
 	u32 mtu_min;
 	u32 mtu_max;
 	u8 id;
+	struct prestera_router *router;
 	struct prestera_lag *lags;
 	struct prestera_counter *counter;
 	u8 lag_member_max;
 	u8 lag_max;
 };
 
+struct prestera_router {
+	struct prestera_switch *sw;
+	struct list_head vr_list;
+	struct list_head rif_entry_list;
+	bool aborted;
+};
+
 struct prestera_rxtx_params {
 	bool use_sdma;
 	u32 map_addr;
@@ -303,6 +311,9 @@ struct prestera_port *prestera_port_find_by_hwid(struct prestera_switch *sw,
 
 int prestera_port_autoneg_set(struct prestera_port *port, u64 link_modes);
 
+int prestera_router_init(struct prestera_switch *sw);
+void prestera_router_fini(struct prestera_switch *sw);
+
 struct prestera_port *prestera_find_port(struct prestera_switch *sw, u32 id);
 
 int prestera_port_cfg_mac_read(struct prestera_port *port,

drivers/net/ethernet/marvell/prestera/prestera_main.c

@@ -902,6 +902,10 @@ static int prestera_switch_init(struct prestera_switch *sw)
 	if (err)
 		return err;
 
+	err = prestera_router_init(sw);
+	if (err)
+		goto err_router_init;
+
 	err = prestera_switchdev_init(sw);
 	if (err)
 		goto err_swdev_register;
@@ -958,6 +962,8 @@ static int prestera_switch_init(struct prestera_switch *sw)
 err_rxtx_register:
 	prestera_switchdev_fini(sw);
 err_swdev_register:
+	prestera_router_fini(sw);
+err_router_init:
 	prestera_netdev_event_handler_unregister(sw);
 	prestera_hw_switch_fini(sw);
 

drivers/net/ethernet/marvell/prestera/prestera_router.c

+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
+/* Copyright (c) 2019-2021 Marvell International Ltd. All rights reserved */
+
+#include <linux/kernel.h>
+#include <linux/types.h>
+
+#include "prestera.h"
+
+int prestera_router_init(struct prestera_switch *sw)
+{
+	struct prestera_router *router;
+
+	router = kzalloc(sizeof(*sw->router), GFP_KERNEL);
+	if (!router)
+		return -ENOMEM;
+
+	sw->router = router;
+	router->sw = sw;
+
+	return 0;
+}
+
+void prestera_router_fini(struct prestera_switch *sw)
+{
+	kfree(sw->router);
+	sw->router = NULL;
+}