Date: Thu, 19 Mar 2015 23:06:46 +0000 (UTC) From: Mark Johnston <markj@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-9@freebsd.org Subject: svn commit: r280269 - stable/9/share/man/man9 Message-ID: <201503192306.t2JN6kL4034245@svn.freebsd.org>
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Author: markj Date: Thu Mar 19 23:06:45 2015 New Revision: 280269 URL: https://svnweb.freebsd.org/changeset/base/280269 Log: MFC r279896: Document m_collapse(). Modified: stable/9/share/man/man9/mbuf.9 Directory Properties: stable/9/share/man/man9/ (props changed) Modified: stable/9/share/man/man9/mbuf.9 ============================================================================== --- stable/9/share/man/man9/mbuf.9 Thu Mar 19 17:42:38 2015 (r280268) +++ stable/9/share/man/man9/mbuf.9 Thu Mar 19 23:06:45 2015 (r280269) @@ -24,7 +24,7 @@ .\" .\" $FreeBSD$ .\" -.Dd November 13, 2012 +.Dd March 11, 2015 .Dt MBUF 9 .Os .\" @@ -136,6 +136,8 @@ .Ft struct mbuf * .Fn m_defrag "struct mbuf *m0" "int how" .Ft struct mbuf * +.Fn m_collapse "struct mbuf *m0" "int how" "int maxfrags" +.Ft struct mbuf * .Fn m_unshare "struct mbuf *m0" "int how" .\" .Sh DESCRIPTION @@ -975,6 +977,20 @@ depending on the caller's preference. This function is especially useful in network drivers, where certain long mbuf chains must be shortened before being added to TX descriptor lists. +.It Fn m_collapse m0 how maxfrags +Defragment an mbuf chain, returning a chain of at most +.Fa maxfrags +mbufs and clusters. +If allocation fails or the chain cannot be collapsed as requested, +.Dv NULL +will be returned, with the original chain possibly modified. +As with +.Fn m_defrag , +.Fa how +should be one of +.Dv M_WAITOK +or +.Dv M_NOWAIT . .It Fn m_unshare m0 how Create a version of the specified mbuf chain whose contents can be safely modified without affecting other users.
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