> IMHO the only sane thing is: > -if keep crc is enabled then pkt_len and data_len include the extra > bytes for the CRC.
Agree. Consider a segmented packet where only the CRC is in the last segment. The length of that last segment would be zero if the CRC length was not included in pkt_len and data_len. Or, if the last two bytes of the CRC is in the last segment; the length of that last segment would be -2 if not including the CRC length. > -if keep crc is disabled, then pkt_len and data_len match the length > of the packet without the CRC.
