linux-kernel - Re: [PATCH 1/2] wan/hdlc_x25: make lapb params configurable

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Message-ID: <20200114054543.576dbf8b@cakuba.hsd1.ca.comcast.net>
Date:   Tue, 14 Jan 2020 05:45:43 -0800
From:   Jakub Kicinski <kubakici@...pl>
To:     Martin Schiller <ms@....tdt.de>
Cc:     khc@...waw.pl, davem@...emloft.net, linux-x25@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] wan/hdlc_x25: make lapb params configurable

On Tue, 14 Jan 2020 14:33:51 +0100, Martin Schiller wrote:
> On 2020-01-14 13:51, Jakub Kicinski wrote:
> > On Tue, 14 Jan 2020 06:37:03 +0100, Martin Schiller wrote:  
> >> >> diff --git a/include/uapi/linux/hdlc/ioctl.h
> >> >> b/include/uapi/linux/hdlc/ioctl.h
> >> >> index 0fe4238e8246..3656ce8b8af0 100644
> >> >> --- a/include/uapi/linux/hdlc/ioctl.h
> >> >> +++ b/include/uapi/linux/hdlc/ioctl.h
> >> >> @@ -3,7 +3,7 @@
> >> >>  #define __HDLC_IOCTL_H__
> >> >>
> >> >>
> >> >> -#define GENERIC_HDLC_VERSION 4	/* For synchronization with sethdlc
> >> >> utility */
> >> >> +#define GENERIC_HDLC_VERSION 5	/* For synchronization with sethdlc
> >> >> utility */  
> >> >
> >> > What's the backward compatibility story in this code?  
> >> 
> >> Well, I thought I have to increment the version to keep the kernel 
> >> code
> >> and the sethdlc utility in sync (like the comment says).  
> > 
> > Perhaps I chose the wrong place for asking this question, IOCTL code
> > was my real worry. I don't think this version number is validated so
> > I think bumping it shouldn't break anything?  
> 
> sethdlc validates the GENERIC_HDLC_VERSION at compile time.
>
> https://mirrors.edge.kernel.org/pub/linux/utils/net/hdlc/

Aw, okay, best not to bump it then.
 
> Another question:
> Where do I have to send my patch for sethdlc to?

No idea :)