mlxsw: core: Trace EMAD messages

Trace EMAD messages going down to HW and up from HW. Devlink needs to be
registered before EMAD init so the trace function can be called
with valid devlink handle.
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
v1->v2:
- Use trace_devlink_hwmsg directly
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlxsw/core.c

@@ -58,6 +58,7 @@
 #include <linux/workqueue.h>
 #include <asm/byteorder.h>
 #include <net/devlink.h>
+#include <trace/events/devlink.h>
 
 #include "core.h"
 #include "item.h"
@@ -447,6 +448,10 @@ static int mlxsw_emad_transmit(struct mlxsw_core *mlxsw_core,
 	if (!skb)
 		return -ENOMEM;
 
+	trace_devlink_hwmsg(priv_to_devlink(mlxsw_core), false, 0,
+			    skb->data + mlxsw_core->driver->txhdr_len,
+			    skb->len - mlxsw_core->driver->txhdr_len);
+
 	atomic_set(&trans->active, 1);
 	err = mlxsw_core_skb_transmit(mlxsw_core, skb, &trans->tx_info);
 	if (err) {
@@ -529,6 +534,9 @@ static void mlxsw_emad_rx_listener_func(struct sk_buff *skb, u8 local_port,
 	struct mlxsw_core *mlxsw_core = priv;
 	struct mlxsw_reg_trans *trans;
 
+	trace_devlink_hwmsg(priv_to_devlink(mlxsw_core), true, 0,
+			    skb->data, skb->len);
+
 	if (!mlxsw_emad_is_resp(skb))
 		goto free_skb;
 
@@ -1110,14 +1118,14 @@ int mlxsw_core_bus_device_register(const struct mlxsw_bus_info *mlxsw_bus_info,
 	if (err)
 		goto err_emad_init;
 
-	err = mlxsw_hwmon_init(mlxsw_core, mlxsw_bus_info, &mlxsw_core->hwmon);
-	if (err)
-		goto err_hwmon_init;
-
 	err = devlink_register(devlink, mlxsw_bus_info->dev);
 	if (err)
 		goto err_devlink_register;
 
+	err = mlxsw_hwmon_init(mlxsw_core, mlxsw_bus_info, &mlxsw_core->hwmon);
+	if (err)
+		goto err_hwmon_init;
+
 	err = mlxsw_driver->init(mlxsw_core, mlxsw_bus_info);
 	if (err)
 		goto err_driver_init;
@@ -1131,9 +1139,9 @@ int mlxsw_core_bus_device_register(const struct mlxsw_bus_info *mlxsw_bus_info,
 err_debugfs_init:
 	mlxsw_core->driver->fini(mlxsw_core);
 err_driver_init:
+err_hwmon_init:
 	devlink_unregister(devlink);
 err_devlink_register:
-err_hwmon_init:
 	mlxsw_emad_fini(mlxsw_core);
 err_emad_init:
 	mlxsw_bus->fini(bus_priv);