Date: Mon, 18 Nov 2013 22:58:14 +0000 (UTC) From: "George V. Neville-Neil" <gnn@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r258328 - head/sys/net Message-ID: <201311182258.rAIMwEFd048783@svn.freebsd.org>
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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. 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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