net: ethernet: ti: introduce cpsw switchdev based driver part 2 - switch

CPSW switchdev based driver which is operating in dual-emac mode by
default, thus working as 2 individual network interfaces. The Switch mode
can be enabled by configuring devlink driver parameter "switch_mode" to 1:

	devlink dev param set platform/48484000.switch \
	name switch_mode value 1 cmode runtime

This can be done regardless of the state of Port's netdevs - UP/DOWN, but
Port's netdev devices have to be UP before joining the bridge to avoid
overwriting of bridge configuration as CPSW switch driver completely
reloads its configuration when first Port changes its state to UP.
When the both interfaces joined the bridge - CPSW switch driver will start
marking packets with offload_fwd_mark flag unless "ale_bypass=0".

All configuration is implemented via switchdev API and notifiers.
Supported:
 - SWITCHDEV_ATTR_ID_PORT_PRE_BRIDGE_FLAGS
 - SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS: BR_MCAST_FLOOD
 - SWITCHDEV_ATTR_ID_PORT_STP_STATE
 - SWITCHDEV_OBJ_ID_PORT_VLAN
 - SWITCHDEV_OBJ_ID_PORT_MDB
 - SWITCHDEV_OBJ_ID_HOST_MDB

Hence CPSW switchdev driver supports:
- FDB offloading
- MDB offloading
- VLAN filtering and offloading
- STP
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/ti/Makefile

@@ -16,7 +16,7 @@ obj-$(CONFIG_TI_CPTS_MOD) += cpts.o
 obj-$(CONFIG_TI_CPSW) += ti_cpsw.o
 ti_cpsw-y := cpsw.o davinci_cpdma.o cpsw_ale.o cpsw_priv.o cpsw_sl.o cpsw_ethtool.o
 obj-$(CONFIG_TI_CPSW_SWITCHDEV) += ti_cpsw_new.o
-ti_cpsw_new-y := cpsw_new.o davinci_cpdma.o cpsw_ale.o cpsw_sl.o cpsw_priv.o cpsw_ethtool.o
+ti_cpsw_new-y := cpsw_switchdev.o cpsw_new.o davinci_cpdma.o cpsw_ale.o cpsw_sl.o cpsw_priv.o cpsw_ethtool.o
 
 obj-$(CONFIG_TI_KEYSTONE_NETCP) += keystone_netcp.o
 keystone_netcp-y := netcp_core.o cpsw_ale.o

drivers/net/ethernet/ti/cpsw_priv.h

@@ -356,6 +356,10 @@ struct cpsw_common {
 	int				speed;
 	int				usage_count;
 	struct page_pool		*page_pool[CPSW_MAX_QUEUES];
+	u8 br_members;
+	struct net_device *hw_bridge_dev;
+	bool ale_bypass;
+	u8 base_mac[ETH_ALEN];
 };
 
 struct cpsw_priv {
@@ -376,6 +380,7 @@ struct cpsw_priv {
 
 	u32 emac_port;
 	struct cpsw_common *cpsw;
+	int offload_fwd_mark;
 };
 
 #define ndev_to_cpsw(ndev) (((struct cpsw_priv *)netdev_priv(ndev))->cpsw)

drivers/net/ethernet/ti/cpsw_switchdev.h

+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Texas Instruments Ethernet Switch Driver
+ */
+
+#ifndef DRIVERS_NET_ETHERNET_TI_CPSW_SWITCHDEV_H_
+#define DRIVERS_NET_ETHERNET_TI_CPSW_SWITCHDEV_H_
+
+#include <net/switchdev.h>
+
+bool cpsw_port_dev_check(const struct net_device *dev);
+int cpsw_switchdev_register_notifiers(struct cpsw_common *cpsw);
+void cpsw_switchdev_unregister_notifiers(struct cpsw_common *cpsw);
+
+#endif /* DRIVERS_NET_ETHERNET_TI_CPSW_SWITCHDEV_H_ */