[src/trunk]: src/sys/dev/ic Trigger a software interrupt if any packets were ...

[jmcneill <jmcneill%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/a3c7d203c096
branches:  trunk
changeset: 354067:a3c7d203c096
user:      jmcneill <jmcneill%NetBSD.org@localhost>
date:      Fri Jun 02 23:39:08 2017 +0000

description:
Trigger a software interrupt if any packets were transmitted in
lan9118_start to workaround a possible issue where completion interrupts
are missed and the watchdog timer fires.

diffstat:

 sys/dev/ic/lan9118.c |  31 ++++++++++++++++++++++---------
 1 files changed, 22 insertions(+), 9 deletions(-)

diffs (89 lines):

diff -r ec3f1fae867f -r a3c7d203c096 sys/dev/ic/lan9118.c
--- a/sys/dev/ic/lan9118.c      Fri Jun 02 22:20:21 2017 +0000
+++ b/sys/dev/ic/lan9118.c      Fri Jun 02 23:39:08 2017 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: lan9118.c,v 1.25 2017/06/01 16:59:20 jmcneill Exp $    */
+/*     $NetBSD: lan9118.c,v 1.26 2017/06/02 23:39:08 jmcneill Exp $    */
 /*
  * Copyright (c) 2008 KIYOHARA Takashi
  * All rights reserved.
@@ -25,7 +25,7 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: lan9118.c,v 1.25 2017/06/01 16:59:20 jmcneill Exp $");
+__KERNEL_RCSID(0, "$NetBSD: lan9118.c,v 1.26 2017/06/02 23:39:08 jmcneill Exp $");
 
 /*
  * The LAN9118 Family
@@ -306,7 +306,8 @@
                bus_space_write_4(sc->sc_iot, sc->sc_ioh, LAN9118_INT_STS,
                    int_sts);
                int_en =
-                   bus_space_read_4(sc->sc_iot, sc->sc_ioh, LAN9118_INT_EN);
+                   bus_space_read_4(sc->sc_iot, sc->sc_ioh, LAN9118_INT_EN) |
+                   LAN9118_INT_SW_INT;
 
                DPRINTFN(3, ("%s: int_sts=0x%x, int_en=0x%x\n",
                    __func__, int_sts, int_en));
@@ -314,6 +315,7 @@
                if (!(int_sts & int_en))
                        break;
                datum = int_sts;
+               handled = 1;
 
 #if 0  /* not yet... */
                if (int_sts & LAN9118_INT_PHY_INT) { /* PHY */
@@ -327,7 +329,7 @@
                        ifp->if_ierrors++;
                        aprint_error_ifnet(ifp, "Receive Error\n");
                }
-               if (int_sts & LAN9118_INT_TSFL) /* TX Status FIFO Level */
+               if (int_sts & (LAN9118_INT_TSFL|LAN9118_INT_SW_INT)) /* TX Status FIFO Level */
                        lan9118_txintr(sc);
                if (int_sts & LAN9118_INT_RXDF_INT) {
                        ifp->if_ierrors++;
@@ -338,10 +340,11 @@
                        aprint_error_ifnet(ifp, "RX Status FIFO Full\n");
                }
                if (int_sts & LAN9118_INT_RSFL) /* RX Status FIFO Level */
-                        lan9118_rxintr(sc);
+                       lan9118_rxintr(sc);
        }
-
-       if_schedule_deferred_start(ifp);
+ 
+       if (handled)
+               if_schedule_deferred_start(ifp);
 
        rnd_add_uint32(&sc->rnd_source, datum);
 
@@ -355,7 +358,7 @@
        struct lan9118_softc *sc = ifp->if_softc;
        struct mbuf *m0, *m;
        unsigned tdfree, totlen, dso;
-       uint32_t txa, txb;
+       uint32_t txa, txb, int_en;
        uint8_t *p;
        int n;
 
@@ -457,8 +460,18 @@
 
                m_freem(m0);
        }
-       if (totlen > 0)
+
+       if (totlen > 0) {
                ifp->if_timer = 5;
+
+               /*
+                * Trigger a software interrupt to catch any missed completion
+                * interrupts.
+                */
+               int_en = bus_space_read_4(sc->sc_iot, sc->sc_ioh, LAN9118_INT_EN);
+               int_en |= LAN9118_INT_SW_INT;
+               bus_space_write_4(sc->sc_iot, sc->sc_ioh, LAN9118_INT_EN, int_en);
+       }
 }
 
 static int