From 762cb5c93628166ca5d600c5ac208692566aceff Mon Sep 17 00:00:00 2001
From: brad <brad@openbsd.org>
Date: Fri, 19 Dec 2014 04:53:58 +0000
Subject: [PATCH] Make use of m_defrag() in re_encap().

---
 sys/dev/ic/re.c | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/sys/dev/ic/re.c b/sys/dev/ic/re.c
index 32219a78801..439d8ec17d4 100644
--- a/sys/dev/ic/re.c
+++ b/sys/dev/ic/re.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: re.c,v 1.163 2014/11/24 10:33:37 brad Exp $	*/
+/*	$OpenBSD: re.c,v 1.164 2014/12/19 04:53:58 brad Exp $	*/
 /*	$FreeBSD: if_re.c,v 1.31 2004/09/04 07:54:05 ru Exp $	*/
 /*
  * Copyright (c) 1997, 1998-2003
@@ -1635,12 +1635,21 @@ re_encap(struct rl_softc *sc, struct mbuf *m, int *idx)
 
 	txq = &sc->rl_ldata.rl_txq[*idx];
 	map = txq->txq_dmamap;
+
 	error = bus_dmamap_load_mbuf(sc->sc_dmat, map, m,
 	    BUS_DMA_WRITE|BUS_DMA_NOWAIT);
-	if (error) {
-		/* XXX try to defrag if EFBIG? */
-		printf("%s: can't map mbuf (error %d)\n",
-		    sc->sc_dev.dv_xname, error);
+	switch (error) {
+	case 0:
+		break;
+
+	case EFBIG:
+		if ((error = m_defrag(m, M_DONTWAIT)) == 0 &&
+		    (error = bus_dmamap_load_mbuf(sc->sc_dmat, map, m,
+		    BUS_DMA_WRITE|BUS_DMA_NOWAIT)) == 0)
+			break;
+
+		/* FALLTHROUGH */
+	default:
 		return (error);
 	}
 
-- 
2.20.1