Hi,
When the kernel runs out of mbuf clusters, the hme receive ring may
become empty. In that case, the hme driver cannot recover as the
ring is only filled after receiving data. My fix is to fill an
empty receive ring every second.
ok?
bluhm
Index: dev/ic/hme.c
===================================================================
RCS file: /data/mirror/openbsd/cvs/src/sys/dev/ic/hme.c,v
retrieving revision 1.61
diff -u -p -r1.61 hme.c
--- dev/ic/hme.c 15 Oct 2009 17:54:54 -0000 1.61
+++ dev/ic/hme.c 23 Mar 2011 00:07:51 -0000
@@ -362,6 +362,13 @@ hme_tick(arg)
bus_space_write_4(t, mac, HME_MACI_EXCNT, 0);
bus_space_write_4(t, mac, HME_MACI_LTCNT, 0);
+ /*
+ * If buffer allocation fails, the receive ring may become
+ * empty. There is no receive interrupt to recover from that.
+ */
+ if (sc->sc_rx_cnt == 0)
+ hme_fill_rx_ring(sc);
+
mii_tick(&sc->sc_mii);
splx(s);
