netdev - Re: [PATCH v2 09/14] net: wwan: t7xx: Add WWAN network interface

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Date:   Thu, 2 Dec 2021 12:44:31 -0800
From:   "Martinez, Ricardo" <ricardo.martinez@...ux.intel.com>
To:     Sergey Ryazanov <ryazanov.s.a@...il.com>
Cc:     netdev@...r.kernel.org, linux-wireless@...r.kernel.org,
        Jakub Kicinski <kuba@...nel.org>,
        David Miller <davem@...emloft.net>,
        Johannes Berg <johannes@...solutions.net>,
        Loic Poulain <loic.poulain@...aro.org>,
        M Chetan Kumar <m.chetan.kumar@...el.com>,
        chandrashekar.devegowda@...el.com,
        Intel Corporation <linuxwwan@...el.com>,
        chiranjeevi.rapolu@...ux.intel.com, haijun.liu@...iatek.com,
        amir.hanania@...el.com,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        dinesh.sharma@...el.com, eliot.lee@...el.com,
        mika.westerberg@...ux.intel.com, moises.veleta@...el.com,
        pierre-louis.bossart@...el.com, muralidharan.sethuraman@...el.com,
        Soumya.Prakash.Mishra@...el.com, sreehari.kancharla@...el.com,
        suresh.nagaraj@...el.com
Subject: Re: [PATCH v2 09/14] net: wwan: t7xx: Add WWAN network interface


Hi Sergey,

On 12/1/2021 1:09 PM, Sergey Ryazanov wrote:
> On Wed, Dec 1, 2021 at 9:06 AM Martinez, Ricardo
> <ricardo.martinez@...ux.intel.com> wrote:
>> On 11/6/2021 11:08 AM, Sergey Ryazanov wrote:
>>> On Mon, Nov 1, 2021 at 6:57 AM Ricardo Martinez wrote:
>>>> +#define IPV4_VERSION           0x40
>>>> +#define IPV6_VERSION           0x60
>>> Just curious why the _VERSION suffix? Why not, for example, PKT_TYPE_ prefix?
>> Nothing special about _VERSION, but it does look a bit weird, will use
>> PKT_TYPE_  as suggested
> I checked the driver code again and found that these constants are
> really used to distinguish between IPv4 and IPv6 packets by checking
> the first byte of the data packet (IP header version field).
>
> Now I am wondering, does the modem firmware report a packet type in
> one of the BAT or PIT headers? If the modem is already reporting a
> packet type, then it is better to use the provided information instead
> of touching the packet data. Otherwise, if the modem does not
> explicitly report a packet type, and you have to check the version
> field of the IP header, then it seems Ok to keep the names of these
> constants as they are (with the _VERSION suffix).

Actually, there is a bit in the PIT header for the packet type, I'll 
make the driver

use it instead of looking at the data packet.