S_RING_ENQUEUED
ringp->s_ring_state |= S_RING_ENQUEUED; \
if (ringp->s_ring_state & S_RING_ENQUEUED) {
if (ringp->s_ring_state & S_RING_ENQUEUED) {
(S_RING_TX_HIWAT | S_RING_WAKEUP_CLIENT | S_RING_ENQUEUED)) {
~(S_RING_TX_HIWAT | S_RING_WAKEUP_CLIENT | S_RING_ENQUEUED);