net/mlx5: Set devlink reload feature bit for supported devices only

Mulitport slave device doesn't support devlink reload, so instead of
complicating initialization flow with devlink_reload_enable() which
will be removed in next patch, don't set DEVLINK_F_RELOAD feature bit
for such devices.

This fixes an error when reload counters exposed (and equal zero) for
the mode that is not supported at all.

Fixes: d89ddaae ("net/mlx5: Disable devlink reload for multi port slave device")
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/mellanox/mlx5/core/devlink.c

@@ -796,6 +796,7 @@ static void mlx5_devlink_traps_unregister(struct devlink *devlink)
 
 int mlx5_devlink_register(struct devlink *devlink)
 {
+	struct mlx5_core_dev *dev = devlink_priv(devlink);
 	int err;
 
 	err = devlink_params_register(devlink, mlx5_devlink_params,
@@ -813,7 +814,9 @@ int mlx5_devlink_register(struct devlink *devlink)
 	if (err)
 		goto traps_reg_err;
 
-	devlink_set_features(devlink, DEVLINK_F_RELOAD);
+	if (!mlx5_core_is_mp_slave(dev))
+		devlink_set_features(devlink, DEVLINK_F_RELOAD);
+
 	return 0;
 
 traps_reg_err: