https://www.kernel.org/doc/html/v5.11/networking/statistics.html
https://access.redhat.com/solutions/21301
https://access.redhat.com/solutions/2073223
https://access.redhat.com/articles/1391433
https://mzhan017.blog.csdn.net/article/details/127799134
Number of packets received but not processed, e.g. due to lack of resources or unsupported protocol. For hardware interfaces this counter may include packets discarded due to L2 address filtering but should not include packets dropped by t