[src/trunk]: src/sys/dev/pci Add note for the TORL register.

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

details:   https://anonhg.NetBSD.org/src/rev/5343500fa2fe
branches:  trunk
changeset: 374736:5343500fa2fe
user:      msaitoh <msaitoh%NetBSD.org@localhost>
date:      Thu May 11 06:56:49 2023 +0000

description:
Add note for the TORL register.

The TOR register includes error, flow control and broadcast rejected.

diffstat:

 sys/dev/pci/if_wm.c |  11 +++++++++--
 1 files changed, 9 insertions(+), 2 deletions(-)

diffs (32 lines):

diff -r dd7e2cf257ea -r 5343500fa2fe sys/dev/pci/if_wm.c
--- a/sys/dev/pci/if_wm.c       Thu May 11 06:54:23 2023 +0000
+++ b/sys/dev/pci/if_wm.c       Thu May 11 06:56:49 2023 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: if_wm.c,v 1.768 2023/05/11 06:54:23 msaitoh Exp $      */
+/*     $NetBSD: if_wm.c,v 1.769 2023/05/11 06:56:49 msaitoh Exp $      */
 
 /*
  * Copyright (c) 2001, 2002, 2003, 2004 Wasabi Systems, Inc.
@@ -82,7 +82,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: if_wm.c,v 1.768 2023/05/11 06:54:23 msaitoh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: if_wm.c,v 1.769 2023/05/11 06:56:49 msaitoh Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_if_wm.h"
@@ -3798,6 +3798,13 @@ wm_tick(void *arg)
        WM_EVCNT_ADD(&sc->sc_ev_roc, CSR_READ(sc, WMREG_ROC));
        WM_EVCNT_ADD(&sc->sc_ev_rjc, CSR_READ(sc, WMREG_RJC));
 
+       /*
+        * The TOR(L) register includes:
+        *  - Error
+        *  - Flow control
+        *  - Broadcast rejected (This note is described in 82574 and newer
+        *    datasheets. What does "broadcast rejected" mean?)
+        */
        WM_EVCNT_ADD(&sc->sc_ev_tor,
            CSR_READ(sc, WMREG_TORL) +
            ((uint64_t)CSR_READ(sc, WMREG_TORH) << 32));