port_dealloc_buf reflects BMI RBDC port_discard_frame reflects RFDC. You can find a
description of these registers in LS1043ADPAARM, Sections 5.5.4.5.30 and 5.5.4.5.33
The most likely reason for these counters growth is that you are simply hitting
the application throughput limit. Additional details can be found in the same document
Sections 5.5.6.8 and 3.3.14. Suggestions for DPDK performance tuning are
provided in the online documentation:
Hope this helps,
Platon