netdev - Re: [PATCH net-next] qmi_wwan: set FLAG_SEND_ZLP to avoid network initiated disconnect

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Date:   Fri, 15 Dec 2017 13:50:29 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     bjorn@...k.no
Cc:     netdev@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH net-next] qmi_wwan: set FLAG_SEND_ZLP to avoid network
 initiated disconnect

From: Bjørn Mork <bjorn@...k.no>
Date: Thu, 14 Dec 2017 19:55:50 +0100

> It has been reported that the dummy byte we add to avoid
> ZLPs can be forwarded by the modem to the PGW/GGSN, and that
> some operators will drop the connection if this happens.
> 
> In theory, QMI devices are based on CDC ECM and should as such
> both support ZLPs and silently ignore the dummy byte.  The latter
> assumption failed.  Let's test out the first.
> 
> Signed-off-by: Bjørn Mork <bjorn@...k.no>
> ---
> I am a bit worried about the effect of this change on all the
> devices I can't test myself. But trying it is the only way we
> can ever find out....

:-)  Applied to net-next, thanks.