It needs to be properly tested by someone with the right diagnostic equipment and a good understanding of the system. Under normal conditions it will want to regen every 400-800km, so make sure that you're doing at least one good length drive during that window. According to Mazda, it needs to drive for 15-20 minutes above 20km/h at normal
The third type of regen is the parked or forced regen. DPF regeneration in progress: This process of regeneration refers to the soot being burned away with a high temperature in the Diesel Particulate Filter (DPF). The regeneration takes place automatically while we steadily drive the car, preferably on a highway.
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mazda 6 dpf forced regeneration