csum2
u_int16_t csum1, csum2, ipcsum;
csum2 = htons((csum >> 16) & 0xffff);
ipcsum = in_addword(csum1, ~csum2 & 0xffff);
uint16_t csum1, csum2;
csum2 = 0;
axe_cmd(sc, AXE_772B_CMD_WRITE_TXCSUM, csum2, csum1, NULL);
csum2 = 0;
axe_cmd(sc, AXE_772B_CMD_WRITE_RXCSUM, csum2, csum1, NULL);
cfncn = csum2;
int csum2(int, uint32_t *, off_t *);