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From: "Bjørn Mork" <bjorn@mork.no>
To: Vamsi Samavedam <vskrishn@codeaurora.org>
Cc: netdev@vger.kernel.org, linux-usb@vger.kernel.org
Subject: [net-next] qmi_wwan: set FLAG_SEND_ZLP to avoid network initiated disconnect
Date: Thu, 14 Dec 2017 22:42:52 +0100	[thread overview]
Message-ID: <87374df0kj.fsf@miraculix.mork.no> (raw)

Vamsi Samavedam <vskrishn@codeaurora.org> writes:

> On Thu, Dec 14, 2017 at 07:55:50PM +0100, Bjørn Mork wrote:
>> 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@mork.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....
>
> flag zlp is tested with pids: 9034,9048,904c,9075, 908E,9079,
> 908A,909F and 90A4. In general, qualcomm usb firmware can
> handle zlps.

Thanks.  That's very good to know.


Bjørn
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WARNING: multiple messages have this Message-ID (diff)
From: "Bjørn Mork" <bjorn@mork.no>
To: Vamsi Samavedam <vskrishn@codeaurora.org>
Cc: netdev@vger.kernel.org, linux-usb@vger.kernel.org
Subject: Re: [PATCH net-next] qmi_wwan: set FLAG_SEND_ZLP to avoid network initiated disconnect
Date: Thu, 14 Dec 2017 22:42:52 +0100	[thread overview]
Message-ID: <87374df0kj.fsf@miraculix.mork.no> (raw)
In-Reply-To: <20171214213959.GC21058@vskrishn2-linux.qualcomm.com> (Vamsi Samavedam's message of "Thu, 14 Dec 2017 13:39:59 -0800")

Vamsi Samavedam <vskrishn@codeaurora.org> writes:

> On Thu, Dec 14, 2017 at 07:55:50PM +0100, Bjørn Mork wrote:
>> 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@mork.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....
>
> flag zlp is tested with pids: 9034,9048,904c,9075, 908E,9079,
> 908A,909F and 90A4. In general, qualcomm usb firmware can
> handle zlps.

Thanks.  That's very good to know.


Bjørn

             reply	other threads:[~2017-12-14 21:42 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-12-14 21:42 Bjørn Mork [this message]
2017-12-14 21:42 ` [PATCH net-next] qmi_wwan: set FLAG_SEND_ZLP to avoid network initiated disconnect Bjørn Mork
  -- strict thread matches above, loose matches on Subject: below --
2017-12-15 18:50 [net-next] " David Miller
2017-12-15 18:50 ` [PATCH net-next] " David Miller
2017-12-14 21:39 [net-next] " Vamsi Samavedam
2017-12-14 21:39 ` [PATCH net-next] " Vamsi Samavedam
2017-12-14 18:55 [net-next] " Bjørn Mork
2017-12-14 18:55 ` [PATCH net-next] " Bjørn Mork

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