mq_drops
mq->mq_drops++;
mq->mq_drops++;
mq->mq_drops += dropped;
return (sysctl_rdint(oldp, oldlenp, newp, mq_drops(mq)));
kstat_kv_u32(&pd->pd_qdrop) = mq_drops(&s->s_sendq);
#define niq_drops(_q) mq_drops(&(_q)->ni_q)
u_int mq_drops;
#define mq_drops(_mq) READ_ONCE((_mq)->mq_drops)