ETHERNET_FCS_SIZE  519 dev/pci/if_em_hw.h     (MAXIMUM_ETHERNET_FRAME_SIZE - ETHERNET_FCS_SIZE)
ETHERNET_FCS_SIZE  521 dev/pci/if_em_hw.h     (MINIMUM_ETHERNET_FRAME_SIZE - ETHERNET_FCS_SIZE)
ETHERNET_FCS_SIZE  522 dev/pci/if_em_hw.h #define CRC_LENGTH                   ETHERNET_FCS_SIZE