iscsi_crc32c
uint32_t iscsi_crc32c(void *address, unsigned long length);
crc_hdr = iscsi_crc32c((char *)ihp,
crc_data = iscsi_crc32c(data, data_len);
crc_calculated = iscsi_crc32c((uchar_t *)ihp,
crc_calculated = iscsi_crc32c(data, dlength);