From mboxrd@z Thu Jan  1 00:00:00 1970
From: Yuanhan Liu <yuanhan.liu@linux.intel.com>
Subject: Re: [PATCH v2 1/2] mbuf: provide rte_pktmbuf_alloc_bulk
 API
Date: Fri, 18 Dec 2015 13:21:22 +0800
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To: Stephen Hemminger <stephen@networkplumber.org>
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On Thu, Dec 17, 2015 at 09:01:14PM -0800, Stephen Hemminger wrote:
...
> > +
> > +	switch (count % 4) {
> > +	while (idx != count) {
> > +		case 0:
> > +			RTE_MBUF_ASSERT(rte_mbuf_refcnt_read(mbufs[idx]) == 0);
> > +			rte_mbuf_refcnt_set(mbufs[idx], 1);
> > +			rte_pktmbuf_reset(mbufs[idx]);
> > +			idx++;
> > +		case 3:
> > +			RTE_MBUF_ASSERT(rte_mbuf_refcnt_read(mbufs[idx]) == 0);
> > +			rte_mbuf_refcnt_set(mbufs[idx], 1);
> > +			rte_pktmbuf_reset(mbufs[idx]);
> > +			idx++;
> > +		case 2:
> > +			RTE_MBUF_ASSERT(rte_mbuf_refcnt_read(mbufs[idx]) == 0);
> > +			rte_mbuf_refcnt_set(mbufs[idx], 1);
> > +			rte_pktmbuf_reset(mbufs[idx]);
> > +			idx++;
> > +		case 1:
> > +			RTE_MBUF_ASSERT(rte_mbuf_refcnt_read(mbufs[idx]) == 0);
> > +			rte_mbuf_refcnt_set(mbufs[idx], 1);
> > +			rte_pktmbuf_reset(mbufs[idx]);
> > +			idx++;
> > +	}
> > +	}
> > +	return 0;
> > +}
> 
> This is weird. Why not just use Duff's device in a more normal manner.

Duff's device; interesting and good to know. Thanks.

	--yliu