Update TX completion event index when putting a packet on the ring

diff --git a/sys/dev/pv/if_xnf.c b/sys/dev/pv/if_xnf.c
index 6131d2c..5cdbac6 100644 (file)
--- a/sys/dev/pv/if_xnf.c
+++ b/sys/dev/pv/if_xnf.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: if_xnf.c,v 1.26 2016/07/29 18:31:51 mikeb Exp $       */
+/*     $OpenBSD: if_xnf.c,v 1.27 2016/07/29 18:33:12 mikeb Exp $       */
 
 /*
  * Copyright (c) 2015, 2016 Mike Belopuhov
@@ -505,6 +505,9 @@ xnf_start(struct ifnet *ifp)
        }
        if (pkts > 0) {
                txr->txr_prod = prod;
+               if (txr->txr_cons_event < txr->txr_cons)
+                       txr->txr_cons_event = txr->txr_cons +
+                           ((txr->txr_prod - txr->txr_cons) >> 1) + 1;
                bus_dmamap_sync(sc->sc_dmat, sc->sc_tx_rmap, 0, 0,
                    BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
                if (prod - txr->txr_prod_event < prod - oprod)