From owner-svn-src-user@FreeBSD.ORG Thu Aug 15 00:17:32 2013 Return-Path: Delivered-To: svn-src-user@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTP id 15C82A9B; Thu, 15 Aug 2013 00:17:32 +0000 (UTC) (envelope-from np@FreeBSD.org) Received: from svn.freebsd.org (svn.freebsd.org [IPv6:2001:1900:2254:2068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.freebsd.org (Postfix) with ESMTPS id 038D7235A; Thu, 15 Aug 2013 00:17:32 +0000 (UTC) Received: from svn.freebsd.org ([127.0.1.70]) by svn.freebsd.org (8.14.7/8.14.7) with ESMTP id r7F0HVc3037894; Thu, 15 Aug 2013 00:17:31 GMT (envelope-from np@svn.freebsd.org) Received: (from np@localhost) by svn.freebsd.org (8.14.7/8.14.5/Submit) id r7F0HVgl037893; Thu, 15 Aug 2013 00:17:31 GMT (envelope-from np@svn.freebsd.org) Message-Id: <201308150017.r7F0HVgl037893@svn.freebsd.org> From: Navdeep Parhar Date: Thu, 15 Aug 2013 00:17:31 +0000 (UTC) To: src-committers@freebsd.org, svn-src-user@freebsd.org Subject: svn commit: r254345 - user/np/cxl_tuning/sys/sys X-SVN-Group: user MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-user@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: "SVN commit messages for the experimental " user" src tree" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 15 Aug 2013 00:17:32 -0000 Author: np Date: Thu Aug 15 00:17:31 2013 New Revision: 254345 URL: http://svnweb.freebsd.org/changeset/base/254345 Log: Add a helper for attaching an mbuf to a buffer with an external refcount. This one is willing to work with buffers that may already be referenced. MEXTADD/m_extadd are suitable only for the first attachment to a cluster -- they initialize the refcount to 1. Modified: user/np/cxl_tuning/sys/sys/mbuf.h Modified: user/np/cxl_tuning/sys/sys/mbuf.h ============================================================================== --- user/np/cxl_tuning/sys/sys/mbuf.h Thu Aug 15 00:13:25 2013 (r254344) +++ user/np/cxl_tuning/sys/sys/mbuf.h Thu Aug 15 00:17:31 2013 (r254345) @@ -396,6 +396,28 @@ m_gettype(int size) return (type); } +/* + * Associated an external reference counted buffer with an mbuf. + */ +static __inline void +m_extaddref(struct mbuf *m, caddr_t buf, u_int size, u_int *ref_cnt, + void (*freef)(void *, void *), void *arg1, void *arg2) +{ + + KASSERT(ref_cnt != NULL, ("%s: ref_cnt not provided", __func__)); + + atomic_add_int(ref_cnt, 1); + m->m_flags |= M_EXT; + m->m_ext.ext_buf = buf; + m->m_ext.ref_cnt = ref_cnt; + m->m_data = m->m_ext.ext_buf; + m->m_ext.ext_size = size; + m->m_ext.ext_free = freef; + m->m_ext.ext_arg1 = arg1; + m->m_ext.ext_arg2 = arg2; + m->m_ext.ext_type = EXT_EXTREF; +} + static __inline uma_zone_t m_getzone(int size) {