linux-kernel - Re: [PATCH net-next v4 2/5] net/lapb: support netdev events

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Message-ID: <39b6386b4ce7462f6cb4448020735ed5@dev.tdt.de>
Date:   Tue, 24 Nov 2020 06:29:44 +0100
From:   Martin Schiller <ms@....tdt.de>
To:     Xie He <xie.he.0141@...il.com>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        Andrew Hendry <andrew.hendry@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Linux X25 <linux-x25@...r.kernel.org>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next v4 2/5] net/lapb: support netdev events

On 2020-11-23 23:09, Xie He wrote:
> On Mon, Nov 23, 2020 at 11:36 AM Jakub Kicinski <kuba@...nel.org> 
> wrote:
>> 
>> > >  From this point of view it will be the best to handle the NETDEV_UP in
>> > > the lapb event handler and establish the link analog to the
>> > > NETDEV_CHANGE event if the carrier is UP.
>> >
>> > Thanks! This way we can make sure LAPB would automatically connect in
>> > all situations.
>> >
>> > Since we'll have a netif_carrier_ok check in NETDEV_UP handing, it
>> > might make the code look prettier to also have a netif_carrier_ok
>> > check in NETDEV_GOING_DOWN handing (for symmetry). Just a suggestion.
>> > You can do whatever looks good to you :)
>> 
>> Xie other than this the patches look good to you?
>> 
>> Martin should I expect a respin to follow Xie's suggestion
>> or should I apply v4?
> 
> There should be a respin because we need to handle the NETDEV_UP
> event. The lapbether driver (and possibly some HDLC WAN drivers)
> doesn't generate carrier events so we need to do auto-connect in the
> NETDEV_UP event.

I'll send a v5 with the appropriate change.