[src/trunk]: src/sys/dev/pci clarify 8842 MAC behaves 100FDX only has no alte...

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

details:   https://anonhg.NetBSD.org/src/rev/321591ad7188
branches:  trunk
changeset: 460882:321591ad7188
user:      nisimura <nisimura%NetBSD.org@localhost>
date:      Thu Nov 07 09:05:29 2019 +0000

description:
clarify 8842 MAC behaves 100FDX only has no alternative media selection
possible.

diffstat:

 sys/dev/pci/if_kse.c |  33 ++++++++++++++++++++++++++++-----
 1 files changed, 28 insertions(+), 5 deletions(-)

diffs (68 lines):

diff -r db62c9393218 -r 321591ad7188 sys/dev/pci/if_kse.c
--- a/sys/dev/pci/if_kse.c      Thu Nov 07 07:45:14 2019 +0000
+++ b/sys/dev/pci/if_kse.c      Thu Nov 07 09:05:29 2019 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: if_kse.c,v 1.39 2019/11/06 14:33:52 nisimura Exp $     */
+/*     $NetBSD: if_kse.c,v 1.40 2019/11/07 09:05:29 nisimura Exp $     */
 
 /*-
  * Copyright (c) 2006 The NetBSD Foundation, Inc.
@@ -30,8 +30,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: if_kse.c,v 1.39 2019/11/06 14:33:52 nisimura Exp $");
-
+__KERNEL_RCSID(0, "$NetBSD: if_kse.c,v 1.40 2019/11/07 09:05:29 nisimura Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -328,6 +327,7 @@
 static void lnkchg(struct kse_softc *);
 static int ksephy_change(struct ifnet *);
 static void ksephy_status(struct ifnet *, struct ifmediareq *);
+static void nopifm_status(struct ifnet *, struct ifmediareq *);
 static void phy_tick(void *);
 #ifdef KSE_EVENT_COUNTERS
 static void stat_tick(void *);
@@ -514,8 +514,16 @@
                ifmedia_add(ifm, IFM_ETHER | IFM_AUTO, 0, NULL);
                ifmedia_set(ifm, IFM_ETHER | IFM_AUTO);
        } else {
-               ifmedia_init(ifm, 0, NULL, NULL);
-               ifmedia_add(ifm, IFM_ETHER | IFM_100_TX, 0, NULL);
+               /*
+                * pretend 100FDX w/ no alternative media selection.
+                * 8842 MAC is tied with a builtin 3 port switch.
+                * It can do rate control over either of tx / rx direction
+                * respectively, tough, this driver leaves the rate unlimited
+                * intending 100Mbps maxinum.
+                * 2 ports behave in AN mode and this driver provides no mean
+                * to see the exact details.
+                */
+               ifmedia_init(ifm, 0, NULL, nopifm_status);
                ifmedia_add(ifm, IFM_ETHER | IFM_100_TX | IFM_FDX, 0, NULL);
                ifmedia_set(ifm, IFM_ETHER | IFM_100_TX | IFM_FDX);
        }
@@ -1345,6 +1353,21 @@
 }
 
 static void
+nopifm_status(struct ifnet *ifp, struct ifmediareq *ifmr)
+{
+       struct kse_softc *sc = ifp->if_softc;
+       struct ifmedia *ifm = &sc->sc_media;
+
+#if KSE_LINKDEBUG > 1
+printf("p1sr: %04x, p2sr: %04x\n", CSR_READ_2(sc, P1SR), CSR_READ_2(sc, P2SR));
+#endif
+
+       /* 8842 MAC pretends 100FDX all the time */
+       ifmr->ifm_active = ifm->ifm_cur->ifm_media;
+       ifmr->ifm_status = IFM_AVALID | IFM_ACTIVE;
+}
+
+static void
 phy_tick(void *arg)
 {
        struct kse_softc *sc = arg;