--- dev/mge/if_mge.c.orig	2013-09-27 15:16:32.000000000 +0200
+++ dev/mge/if_mge.c	2013-09-27 15:19:59.000000000 +0200
@@ -1506,9 +1506,22 @@
 		if (m0 == NULL)
 			break;
 
+		if (m0->m_pkthdr.csum_flags & (CSUM_IP|CSUM_TCP|CSUM_UDP) ||
+		    m0->m_flags & M_VLANTAG) {
+			if (M_WRITABLE(m0) == 0) {
+				mtmp = m_dup(m0, M_DONTWAIT);
+				m_freem(m0);
+				if (mtmp == NULL)
+					continue;
+				m0 = mtmp;
+			}
+		}
+		/* The driver support only one DMA fragment. */
+		if (m0->m_next != NULL) {
 		mtmp = m_defrag(m0, M_NOWAIT);
 		if (mtmp)
 			m0 = mtmp;
+		}
 
 		if (mge_encap(sc, m0)) {
 			IF_PREPEND(&ifp->if_snd, m0);