[src/trunk]: src/share/man/man4 elaborate on why we don't support hardware ch...

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

details:   https://anonhg.NetBSD.org/src/rev/d5e9c66d776d
branches:  trunk
changeset: 1009453:d5e9c66d776d
user:      jdolecek <jdolecek%NetBSD.org@localhost>
date:      Thu Apr 23 15:54:36 2020 +0000

description:
elaborate on why we don't support hardware checksum offloading, and probably
never will

diffstat:

 share/man/man4/sk.4 |  10 ++++++++--
 1 files changed, 8 insertions(+), 2 deletions(-)

diffs (31 lines):

diff -r f87a4945cc77 -r d5e9c66d776d share/man/man4/sk.4
--- a/share/man/man4/sk.4       Thu Apr 23 15:06:49 2020 +0000
+++ b/share/man/man4/sk.4       Thu Apr 23 15:54:36 2020 +0000
@@ -1,4 +1,4 @@
-.\"    $NetBSD: sk.4,v 1.23 2019/08/30 09:24:19 wiz Exp $
+.\"    $NetBSD: sk.4,v 1.24 2020/04/23 15:54:36 jdolecek Exp $
 .\"
 .\" Copyright (c) 2003, The NetBSD Foundation, Inc.
 .\" All rights reserved.
@@ -58,7 +58,7 @@
 .\"
 .\" $FreeBSD: src/share/man/man4/man4.i386/sk.4,v 1.3 1999/08/28 00:20:29 peter Exp $
 .\"
-.Dd August 24, 2019
+.Dd April 23, 2020
 .Dt SK 4
 .Os
 .Sh NAME
@@ -285,6 +285,12 @@
 .An Mark Kettenis Aq Mt kettenis%openbsd.org@localhost .
 .Sh BUGS
 Support for checksum offload is unimplemented.
+Particularly for Yukon-II hardware, there are multiple different
+receive and transmit offload silicon bugs which have to be worked
+around in software when using hardware offloading.
+For this reason, support for hardware offloading
+is not very desirable for therse controllers, and unlikely to be
+ever implemented.
 .Pp
 Performance with at least some Marvell-based adapters is poor,
 especially on loaded PCI buses or when the adapters are behind