Re: [PATCH net-next v2 5/6] net/lapb: support netdev events

[Xie He]

On Mon, Nov 16, 2020 at 6:01 AM Martin Schiller <ms@xxxxxxxxxx> wrote:
>
> This makes it possible to handle carrier loss and detection.
> In case of Carrier Loss, layer 2 is terminated
> 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).

> +                               lapb_dbg(0, "(%p): Carrier detected: %s\n",
> +                                        dev, dev->name);
> +                               if (lapb->mode & LAPB_DCE) {
> +                                       lapb_start_t1timer(lapb);
> +                               } else {
> +                                       if (lapb->state == LAPB_STATE_0) {
> +                                               lapb->state = LAPB_STATE_1;
> +                                               lapb_establish_data_link(lapb);
> +                                       }
> +                               }

Do you mean we will now automatically establish LAPB connections
without upper layers instructing us to do so?

If that is the case, is the one-byte header for instructing the LAPB
layer to connect / disconnect no longer needed?