netdev - RE: [PATCH net 3/3] ice: Add set_termios tty operations handle to GNSS

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Message-ID: <BN6PR11MB4177480C375591CF5BA8E812E37F9@BN6PR11MB4177.namprd11.prod.outlook.com>
Date:   Mon, 5 Sep 2022 19:41:34 +0000
From:   "Michalik, Michal" <michal.michalik@...el.com>
To:     Johan Hovold <johan@...nel.org>, Jakub Kicinski <kuba@...nel.org>,
        "Nguyen, Anthony L" <anthony.l.nguyen@...el.com>
CC:     "davem@...emloft.net" <davem@...emloft.net>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "richardcochran@...il.com" <richardcochran@...il.com>,
        "G, GurucharanX" <gurucharanx.g@...el.com>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>
Subject: RE: [PATCH net 3/3] ice: Add set_termios tty operations handle to
 GNSS

Hello Johan,

Much thanks for valuable feedback. We really appreciate that you have pointed that
problem so we can fix it as soon as possible. 

BR,
M^2

> -----Original Message-----
> From: Johan Hovold <johan@...nel.org> 
> Sent: Thursday, September 1, 2022 8:45 AM
> To: Jakub Kicinski <kuba@...nel.org>; Nguyen, Anthony L <anthony.l.nguyen@...el.com>
> Cc: davem@...emloft.net; pabeni@...hat.com; edumazet@...gle.com; Michalik, Michal <michal.michalik@...el.com>; netdev@...r.kernel.org; richardcochran@...il.com; G, GurucharanX <gurucharanx.g@...el.com>; Greg Kroah-Hartman <gregkh@...uxfoundation.org>; Jiri Slaby <jirislaby@...nel.org>
> Subject: Re: [PATCH net 3/3] ice: Add set_termios tty operations handle to GNSS
> 
> On Wed, Aug 31, 2022 at 02:54:39PM -0700, Jakub Kicinski wrote:
> > On Mon, 29 Aug 2022 15:00:49 -0700 Tony Nguyen wrote:
> > > From: Michal Michalik <michal.michalik@...el.com>
> > > 
> > > Some third party tools (ex. ubxtool) try to change GNSS TTY parameters
> > > (ex. speed). While being optional implementation, without set_termios
> > > handle this operation fails and prevents those third party tools from
> > > working. TTY interface in ice driver is virtual and doesn't need any change
> > > on set_termios, so is left empty. Add this mock to support all Linux TTY
> > > APIs.
> > > 
> > > Fixes: 43113ff73453 ("ice: add TTY for GNSS module for E810T device")
> > > Signed-off-by: Michal Michalik <michal.michalik@...el.com>
> > > Tested-by: Gurucharan <gurucharanx.g@...el.com> (A Contingent worker at Intel)
> > > Signed-off-by: Tony Nguyen <anthony.l.nguyen@...el.com>
> > 
> > Please CC GNSS and TTY maintainers on the patches relating to 
> > the TTY/GNSS channel going forward.
> > 
> > CC: Greg, Jiri, Johan
> > 
> > We'll pull in a day or two if there are no objections.
> 
> Hmm. Why was this implemented as a roll-your-own tty driver instead of
> using the GNSS subsystem, which also would have allowed for a smaller
> (and likely less buggy) implementation?
> 
> Looks like this was merged in 5.18 with 43113ff73453 ("ice: add TTY for
> GNSS module for E810T device") without any input from people familiar
> with tty either.
> 

Original author is off, but to be completely honest with you - we most likely
did not noticed the possiblity to align to GNSS subsystem. That is a mistake -
we are working on understanding if we can easily fix that. We will back you you
as soon as came up with the solution.

> Johan
>