PSTATs counters are only 32-bit
In the worst case scenario (Tx/Rx counter, the smallest Ethernet frame, 100% load) these counters may overflow after less than an hour. Actually, the HDL module has 16-bit counters, they are accumulated to 32-bits in the PSTATs kernel driver. This should be fixed by expanding the software part of the counters (kernel driver) to be 64-bits wide.