MLX5_ESWITCH_REG_C1_LOOPBACK_ENABLED
esw->flags |= MLX5_ESWITCH_REG_C1_LOOPBACK_ENABLED;
esw->flags &= ~MLX5_ESWITCH_REG_C1_LOOPBACK_ENABLED;
return !!(esw->flags & MLX5_ESWITCH_REG_C1_LOOPBACK_ENABLED);