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

[Xie He]

On Tue, Nov 24, 2020 at 1:40 AM Martin Schiller <ms@xxxxxxxxxx> 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@xxxxxxxxxx>

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

Thanks!