net: marvell: prestera: devlink: add traps/groups implementation

Add devlink traps registration (with corresponding groups) for
all the traffic types that driver traps to the CPU;
prestera_rxtx: report each packet trapped to the CPU (RX) to the
prestera_devlink;
Signed-off-by: Oleksandr Mazur <oleksandr.mazur@plvision.eu>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -170,6 +170,7 @@ struct prestera_event {
 
 struct prestera_switchdev;
 struct prestera_rxtx;
+struct prestera_trap_data;
 
 struct prestera_switch {
 	struct prestera_device *dev;
@@ -177,6 +178,7 @@ struct prestera_switch {
 	struct prestera_rxtx *rxtx;
 	struct list_head event_handlers;
 	struct notifier_block netdev_nb;
+	struct prestera_trap_data *trap_data;
 	char base_mac[ETH_ALEN];
 	struct list_head port_list;
 	rwlock_t port_list_lock;

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

@@ -20,4 +20,7 @@ void prestera_devlink_port_clear(struct prestera_port *port);
 
 struct devlink_port *prestera_devlink_get_port(struct net_device *dev);
 
+void prestera_devlink_trap_report(struct prestera_port *port,
+				  struct sk_buff *skb, u8 cpu_code);
+
 #endif /* _PRESTERA_DEVLINK_H_ */

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

@@ -19,6 +19,7 @@
 #define PRESTERA_DSA_W1_EXT_BIT		BIT(31)
 #define PRESTERA_DSA_W1_CFI_BIT		BIT(30)
 #define PRESTERA_DSA_W1_PORT_NUM	GENMASK(11, 10)
+#define PRESTERA_DSA_W1_MASK_CPU_CODE	GENMASK(7, 0)
 
 #define PRESTERA_DSA_W2_EXT_BIT		BIT(31)
 #define PRESTERA_DSA_W2_PORT_NUM	BIT(20)
@@ -74,6 +75,8 @@ int prestera_dsa_parse(struct prestera_dsa *dsa, const u8 *dsa_buf)
 			(FIELD_GET(PRESTERA_DSA_W1_PORT_NUM, words[1]) << 5) |
 			(FIELD_GET(PRESTERA_DSA_W2_PORT_NUM, words[2]) << 7);
 
+	dsa->cpu_code = FIELD_GET(PRESTERA_DSA_W1_MASK_CPU_CODE, words[1]);
+
 	return 0;
 }
 

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

@@ -27,6 +27,7 @@ struct prestera_dsa {
 	struct prestera_dsa_vlan vlan;
 	u32 hw_dev_num;
 	u32 port_num;
+	u8 cpu_code;
 };
 
 int prestera_dsa_parse(struct prestera_dsa *dsa, const u8 *dsa_buf);

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

@@ -14,6 +14,7 @@
 #include "prestera.h"
 #include "prestera_hw.h"
 #include "prestera_rxtx.h"
+#include "prestera_devlink.h"
 
 #define PRESTERA_SDMA_WAIT_MUL		10
 
@@ -214,9 +215,10 @@ static struct sk_buff *prestera_sdma_rx_skb_get(struct prestera_sdma *sdma,
 static int prestera_rxtx_process_skb(struct prestera_sdma *sdma,
 				     struct sk_buff *skb)
 {
-	const struct prestera_port *port;
+	struct prestera_port *port;
 	struct prestera_dsa dsa;
 	u32 hw_port, dev_id;
+	u8 cpu_code;
 	int err;
 
 	skb_pull(skb, ETH_HLEN);
@@ -259,6 +261,9 @@ static int prestera_rxtx_process_skb(struct prestera_sdma *sdma,
 		__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), tci);
 	}
 
+	cpu_code = dsa.cpu_code;
+	prestera_devlink_trap_report(port, skb, cpu_code);
+
 	return 0;
 }