implement EFBIG handling for heavily fragmented packets on the tx path.

ok claudio@

diff --git a/sys/dev/pci/if_bnx.c b/sys/dev/pci/if_bnx.c
index 0ed224d..ce03555 100644 (file)
--- a/sys/dev/pci/if_bnx.c
+++ b/sys/dev/pci/if_bnx.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: if_bnx.c,v 1.106 2014/07/12 18:48:51 tedu Exp $       */
+/*     $OpenBSD: if_bnx.c,v 1.107 2014/07/18 07:11:04 dlg Exp $        */
 
 /*-
  * Copyright (c) 2006 Broadcom Corporation
@@ -4882,9 +4882,18 @@ bnx_tx_encap(struct bnx_softc *sc, struct mbuf *m)
        /* Map the mbuf into our DMA address space. */
        error = bus_dmamap_load_mbuf(sc->bnx_dmatag, map, m,
            BUS_DMA_NOWAIT);
-       if (error != 0) {
-               printf("%s: Error mapping mbuf into TX chain!\n",
-                   sc->bnx_dev.dv_xname);
+       switch (error) {
+       case 0:
+               break;
+
+       case EFBIG:
+               if ((error = m_defrag(m, M_DONTWAIT)) == 0 &&
+                   (error = bus_dmamap_load_mbuf(sc->bnx_dmatag, map, m,
+                    BUS_DMA_NOWAIT)) == 0)
+                       break;
+
+               /* FALLTHROUGH */
+       default:
                sc->tx_dma_map_failures++;
                goto maperr;
        }