linux-kernel - Re: [PATCH net-next v6 2/5] net/lapb: support netdev events

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Message-ID: <CAJht_EOJ2M3tjN_2dQa2PweHCvJK8EXpnY7kGyJ7RezXBP4f8g@mail.gmail.com>
Date:   Tue, 24 Nov 2020 11:05:35 -0800
From:   Xie He <xie.he.0141@...il.com>
To:     Martin Schiller <ms@....tdt.de>
Cc:     Andrew Hendry <andrew.hendry@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        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 v6 2/5] net/lapb: support netdev events

On Tue, Nov 24, 2020 at 1:40 AM Martin Schiller <ms@....tdt.de> wrote:
>
> This patch allows layer2 (LAPB) to react to netdev events itself and
> avoids the detour via layer3 (X.25).
>
> 1. Establish layer2 on NETDEV_UP events, if the carrier is already up.
>
> 2. Call lapb_disconnect_request() on NETDEV_GOING_DOWN events to signal
>    the peer that the connection will go down.
>    (Only when the carrier is up.)
>
> 3. When a NETDEV_DOWN event occur, clear all queues, enter state
>    LAPB_STATE_0 and stop all timers.
>
> 4. The NETDEV_CHANGE event makes it possible to handle carrier loss and
>    detection.
>
>    In case of Carrier Loss, clear all queues, enter state LAPB_STATE_0
>    and stop all timers.
>
>    In case of Carrier Detection, we start timer t1 on a DCE interface,
>    and on a DTE interface we change to state LAPB_STATE_1 and start
>    sending SABM(E).
>
> Signed-off-by: Martin Schiller <ms@....tdt.de>

Acked-by: Xie He <xie.he.0141@...il.com>

Thanks!