net: marvell: Implement TC flower offload

Add ACL infrastructure for Prestera Switch ASICs family devices to
offload cls_flower rules to be processed in the HW.

ACL implementation is based on tc filter api. The flower classifier
is supported to configure ACL rules/matches/action.

Supported actions:

    - drop
    - trap
    - pass

Supported dissector keys:

    - indev
    - src_mac
    - dst_mac
    - src_ip
    - dst_ip
    - ip_proto
    - src_port
    - dst_port
    - vlan_id
    - vlan_ethtype
    - icmp type/code

Co-developed-by: Volodymyr Mytnyk <vmytnyk@marvell.com>
Signed-off-by: Volodymyr Mytnyk <vmytnyk@marvell.com>
Signed-off-by: Serhiy Boiko <serhiy.boiko@plvision.eu>
Signed-off-by: Vadym Kochan <vkochan@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/marvell/prestera/Makefile

@@ -2,6 +2,7 @@
 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_switchdev.o prestera_acl.o prestera_flow.o \
+			   prestera_flower.o
 
 obj-$(CONFIG_PRESTERA_PCI)	+= prestera_pci.o

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

@@ -67,9 +67,12 @@ struct prestera_lag {
 	u16 lag_id;
 };
 
+struct prestera_flow_block;
+
 struct prestera_port {
 	struct net_device *dev;
 	struct prestera_switch *sw;
+	struct prestera_flow_block *flow_block;
 	struct devlink_port dl_port;
 	struct list_head lag_member;
 	struct prestera_lag *lag;
@@ -171,11 +174,13 @@ struct prestera_event {
 struct prestera_switchdev;
 struct prestera_rxtx;
 struct prestera_trap_data;
+struct prestera_acl;
 
 struct prestera_switch {
 	struct prestera_device *dev;
 	struct prestera_switchdev *swdev;
 	struct prestera_rxtx *rxtx;
+	struct prestera_acl *acl;
 	struct list_head event_handlers;
 	struct notifier_block netdev_nb;
 	struct prestera_trap_data *trap_data;