diff options
Diffstat (limited to 'sys/dev/ic')
| -rw-r--r-- | sys/dev/ic/xl.c | 37 |
1 files changed, 36 insertions, 1 deletions
diff --git a/sys/dev/ic/xl.c b/sys/dev/ic/xl.c index d048e64d971..3ba6299768c 100644 --- a/sys/dev/ic/xl.c +++ b/sys/dev/ic/xl.c @@ -1,4 +1,4 @@ -/* $OpenBSD: xl.c,v 1.66 2005/11/07 03:20:00 brad Exp $ */ +/* $OpenBSD: xl.c,v 1.67 2006/01/11 03:57:50 brad Exp $ */ /* * Copyright (c) 1997, 1998, 1999 @@ -1914,6 +1914,7 @@ xl_encap_90xB(sc, c, m_head) d->xl_status = htole32(0); d->xl_next = 0; +reload: if (bus_dmamap_load_mbuf(sc->sc_dmat, map, m_head, BUS_DMA_NOWAIT) != 0) return (ENOBUFS); @@ -1926,6 +1927,40 @@ xl_encap_90xB(sc, c, m_head) f->xl_len = htole32(map->dm_segs[frag].ds_len); } + /* + * Handle special case: we used up all 63 fragments, + * but we have more mbufs left in the chain. Copy the + * data into an mbuf cluster. Note that we don't + * bother clearing the values in the other fragment + * pointers/counters; it wouldn't gain us anything, + * and would waste cycles. + */ + if (frag != map->dm_nsegs) { + struct mbuf *m_new = NULL; + + printf("%s: allocating a cluster\n", sc->sc_dev.dv_xname); + + MGETHDR(m_new, M_DONTWAIT, MT_DATA); + if (m_new == NULL) { + m_freem(m_head); + return (1); + } + if (m_head->m_pkthdr.len > MHLEN) { + MCLGET(m_new, M_DONTWAIT); + if (!(m_new->m_flags & M_EXT)) { + m_freem(m_new); + m_freem(m_head); + return (1); + } + } + m_copydata(m_head, 0, m_head->m_pkthdr.len, + mtod(m_new, caddr_t)); + m_new->m_pkthdr.len = m_new->m_len = m_head->m_pkthdr.len; + m_freem(m_head); + m_head = m_new; + goto reload; + } + bus_dmamap_sync(sc->sc_dmat, map, 0, map->dm_mapsize, BUS_DMASYNC_PREWRITE); |