ISP_NXT_QENTRY
optr = ISP_NXT_QENTRY(oop, ATIO_QUEUE_LEN(isp));
optr = ISP_NXT_QENTRY(optr, RESULT_QUEUE_LEN(isp));
sptr = ISP_NXT_QENTRY(sptr, RESULT_QUEUE_LEN(isp));
optr = ISP_NXT_QENTRY(cptr, RESULT_QUEUE_LEN(isp));
nxt = ISP_NXT_QENTRY(nxt, RQUEST_QUEUE_LEN(isp));
nxt = ISP_NXT_QENTRY(isp->isp_reqidx, RQUEST_QUEUE_LEN(isp));
*optrp = ISP_NXT_QENTRY(*optrp, ql);
isp->isp_reqidx = ISP_NXT_QENTRY(isp->isp_reqidx, RQUEST_QUEUE_LEN(isp)); \