[src/trunk]: src/sys/dev/pci switch to deferred if_start framework.

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

details:   https://anonhg.NetBSD.org/src/rev/a17097faf11d
branches:  trunk
changeset: 461514:a17097faf11d
user:      nisimura <nisimura%NetBSD.org@localhost>
date:      Fri Nov 29 05:47:26 2019 +0000

description:
switch to deferred if_start framework.

diffstat:

 sys/dev/pci/if_kse.c |  18 ++++++++++++------
 1 files changed, 12 insertions(+), 6 deletions(-)

diffs (76 lines):

diff -r c8a47f01f3c0 -r a17097faf11d sys/dev/pci/if_kse.c
--- a/sys/dev/pci/if_kse.c      Fri Nov 29 04:59:15 2019 +0000
+++ b/sys/dev/pci/if_kse.c      Fri Nov 29 05:47:26 2019 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: if_kse.c,v 1.42 2019/11/26 08:37:05 nisimura Exp $     */
+/*     $NetBSD: if_kse.c,v 1.43 2019/11/29 05:47:26 nisimura Exp $     */
 
 /*-
  * Copyright (c) 2006 The NetBSD Foundation, Inc.
@@ -34,7 +34,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: if_kse.c,v 1.42 2019/11/26 08:37:05 nisimura Exp $");
+__KERNEL_RCSID(0, "$NetBSD: if_kse.c,v 1.43 2019/11/29 05:47:26 nisimura Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -567,6 +567,7 @@
            IFCAP_CSUM_UDPv4_Tx | IFCAP_CSUM_UDPv4_Rx;
 
        if_attach(ifp);
+       if_deferred_start_init(ifp, NULL);
        ether_ifattach(ifp, enaddr);
 
 #ifdef KSE_EVENT_COUNTERS
@@ -1012,7 +1013,8 @@
                bus_dmamap_sync(sc->sc_dmat, dmamap, 0, dmamap->dm_mapsize,
                    BUS_DMASYNC_PREWRITE);
 
-               lasttx = -1; tdes0 = 0;
+               tdes0 = 0; /* to postpone 1st segment T0_OWN write */
+               lasttx = -1;
                for (nexttx = sc->sc_txnext, seg = 0;
                     seg < dmamap->dm_nsegs;
                     seg++, nexttx = KSE_NEXTTX(nexttx)) {
@@ -1027,10 +1029,9 @@
                        tdes->t1 = sc->sc_t1csum
                             | (dmamap->dm_segs[seg].ds_len & T1_TBS_MASK);
                        tdes->t0 = tdes0;
-                       tdes0 |= T0_OWN;
+                       tdes0 = T0_OWN; /* 2nd and other segments */
                        lasttx = nexttx;
                }
-
                /*
                 * Outgoing NFS mbuf must be unloaded when Tx completed.
                 * Without T1_IC NFS mbuf is left unack'ed for excessive
@@ -1047,7 +1048,7 @@
                        }
                } while ((m = m->m_next) != NULL);
 
-               /* Write last T0_OWN bit of the 1st segment */
+               /* Write deferred 1st segment T0_OWN at the final stage */
                sc->sc_txdescs[lasttx].t1 |= T1_LS;
                sc->sc_txdescs[sc->sc_txnext].t1 |= T1_FS;
                sc->sc_txdescs[sc->sc_txnext].t0 = T0_OWN;
@@ -1188,6 +1189,7 @@
 kse_intr(void *arg)
 {
        struct kse_softc *sc = arg;
+       struct ifnet *ifp = &sc->sc_ethercom.ec_if;
        uint32_t isr;
 
        if ((isr = CSR_READ_4(sc, INTST)) == 0)
@@ -1203,6 +1205,10 @@
                aprint_error_dev(sc->sc_dev, "Rx descriptor full\n");
 
        CSR_WRITE_4(sc, INTST, isr);
+
+       if (ifp->if_flags & IFF_RUNNING)
+               if_schedule_deferred_start(ifp);
+
        return 1;
 }