Date: Tue, 19 Nov 2013 14:48:42 +0400 From: "Alexander V. Chernikov" <melifaro@FreeBSD.org> To: "George V. Neville-Neil" <gnn@FreeBSD.org>, src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: Re: svn commit: r258328 - head/sys/net Message-ID: <528B420A.70105@FreeBSD.org> In-Reply-To: <201311182258.rAIMwEFd048783@svn.freebsd.org> References: <201311182258.rAIMwEFd048783@svn.freebsd.org>
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On 19.11.2013 02:58, George V. Neville-Neil wrote: > Author: gnn > Date: Mon Nov 18 22:58:14 2013 > New Revision: 258328 > URL: http://svnweb.freebsd.org/changeset/base/258328 > > Log: > Allow ethernet drivers to pass in packets connected via the nextpkt pointer. > Handling packets in this way allows drivers to amortize work during packet reception. Great! First, but important step in kernel batching :) > > Submitted by: Vijay Singh > Sponsored by: NetApp > > Modified: > head/sys/net/if_ethersubr.c > > Modified: head/sys/net/if_ethersubr.c > ============================================================================== > --- head/sys/net/if_ethersubr.c Mon Nov 18 22:55:50 2013 (r258327) > +++ head/sys/net/if_ethersubr.c Mon Nov 18 22:58:14 2013 (r258328) > @@ -708,13 +708,25 @@ static void > ether_input(struct ifnet *ifp, struct mbuf *m) > { > > + struct mbuf *mn; > + > /* > - * We will rely on rcvif being set properly in the deferred context, > - * so assert it is correct here. > + * The drivers are allowed to pass in a chain of packets linked with > + * m_nextpkt. We split them up into separate packets here and pass > + * them up. This allows the drivers to amortize the receive lock. > */ > - KASSERT(m->m_pkthdr.rcvif == ifp, ("%s: ifnet mismatch", __func__)); > + while (m) { > + mn = m->m_nextpkt; > + m->m_nextpkt = NULL; > > - netisr_dispatch(NETISR_ETHER, m); > + /* > + * We will rely on rcvif being set properly in the deferred context, > + * so assert it is correct here. > + */ > + KASSERT(m->m_pkthdr.rcvif == ifp, ("%s: ifnet mismatch", __func__)); > + netisr_dispatch(NETISR_ETHER, m); > + m = mn; > + } > } > > /* >
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