nextq
if (nextq(q->tail) != q->head) {
q->tail = nextq(q->tail);
q->head = nextq(q->head);
int i, nextq;
nextq = 0;
mbx.rss_cfg.tbl_offset = nextq;
mbx.rss_cfg.ind_tbl[i] = rss->ind_tbl[nextq++];