FLAG_SET_XMIT_TIMER
*ack_flag &= ~FLAG_SET_XMIT_TIMER;
*ack_flag &= ~FLAG_SET_XMIT_TIMER;
flag |= FLAG_SET_XMIT_TIMER; /* set TLP or RTO timer */
flag |= FLAG_SET_XMIT_TIMER; /* set TLP or RTO timer */
if (flag & FLAG_SET_XMIT_TIMER)