From owner-svn-src-head@freebsd.org Sun Jan 3 21:32:49 2016 Return-Path: Delivered-To: svn-src-head@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 1946CA60A30; Sun, 3 Jan 2016 21:32:49 +0000 (UTC) (envelope-from avos@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id C4BD911B7; Sun, 3 Jan 2016 21:32:48 +0000 (UTC) (envelope-from avos@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id u03LWlO3053659; Sun, 3 Jan 2016 21:32:47 GMT (envelope-from avos@FreeBSD.org) Received: (from avos@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id u03LWlia053658; Sun, 3 Jan 2016 21:32:47 GMT (envelope-from avos@FreeBSD.org) Message-Id: <201601032132.u03LWlia053658@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: avos set sender to avos@FreeBSD.org using -f From: Andriy Voskoboinyk Date: Sun, 3 Jan 2016 21:32:47 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r293119 - head/sys/dev/iwm X-SVN-Group: head MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 03 Jan 2016 21:32:49 -0000 Author: avos Date: Sun Jan 3 21:32:47 2016 New Revision: 293119 URL: https://svnweb.freebsd.org/changeset/base/293119 Log: iwm: use m_collapse() to defragment a mbuf chain - Simplify defragmentation code. - Use proper number of dma segments for data. Approved by: adrian (mentor) Obtained from: DragonFlyBSD (mostly) Differential Revision: https://reviews.freebsd.org/D4754 Modified: head/sys/dev/iwm/if_iwm.c Modified: head/sys/dev/iwm/if_iwm.c ============================================================================== --- head/sys/dev/iwm/if_iwm.c Sun Jan 3 21:30:22 2016 (r293118) +++ head/sys/dev/iwm/if_iwm.c Sun Jan 3 21:32:47 2016 (r293119) @@ -956,7 +956,7 @@ iwm_alloc_tx_ring(struct iwm_softc *sc, error = bus_dma_tag_create(sc->sc_dmat, 1, 0, BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, NULL, NULL, MCLBYTES, - IWM_MAX_SCATTER - 1, MCLBYTES, 0, NULL, NULL, &ring->data_dmat); + IWM_MAX_SCATTER - 2, MCLBYTES, 0, NULL, NULL, &ring->data_dmat); if (error != 0) { device_printf(sc->sc_dev, "could not create TX buf DMA tag\n"); goto fail; @@ -2778,23 +2778,15 @@ iwm_tx(struct iwm_softc *sc, struct mbuf return error; } /* Too many DMA segments, linearize mbuf. */ - MGETHDR(m1, M_NOWAIT, MT_DATA); + m1 = m_collapse(m, M_NOWAIT, IWM_MAX_SCATTER - 2); if (m1 == NULL) { + device_printf(sc->sc_dev, + "%s: could not defrag mbuf\n", __func__); m_freem(m); - return ENOBUFS; - } - if (m->m_pkthdr.len > MHLEN) { - MCLGET(m1, M_NOWAIT); - if (!(m1->m_flags & M_EXT)) { - m_freem(m); - m_freem(m1); - return ENOBUFS; - } + return (ENOBUFS); } - m_copydata(m, 0, m->m_pkthdr.len, mtod(m1, void *)); - m1->m_pkthdr.len = m1->m_len = m->m_pkthdr.len; - m_freem(m); m = m1; + error = bus_dmamap_load_mbuf_sg(ring->data_dmat, data->map, m, segs, &nsegs, BUS_DMA_NOWAIT); if (error != 0) {