so_splicequeue
so->so_splicequeue = net_tq(pru_flowid(so));
task_del(so->so_splicequeue, &so->so_splicetask);
task_add(so->so_splicequeue, &so->so_splicetask);
task_add(so->so_sp->ssp_soback->so_splicequeue,
spq = so->so_splicequeue;
spqback = soback->so_splicequeue;