netdev - Re: RMNET QMAP data aggregation with size greater than 16384

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Date:   Fri, 6 Aug 2021 22:22:02 +0200
From:   Aleksander Morgado <aleksander@...ksander.es>
To:     Bjørn Mork <bjorn@...k.no>
Cc:     Subash Abhinov Kasiviswanathan <subashab@...eaurora.org>,
        Daniele Palmas <dnlplm@...il.com>,
        Network Development <netdev@...r.kernel.org>,
        Sean Tranchetti <stranche@...eaurora.org>
Subject: Re: RMNET QMAP data aggregation with size greater than 16384

Hey,

> > The summary of the thread was to set a large rx_urb_size during probe
> > itself for qmi_wwan.
>
> Yes, I think it would be good to make the driver DTRT automatically.
> Coding driver specific quirks into ModemManager might work, but it feels
> wrong to work around a Linux driver bug. We don't have to do that.  We
> can fix the driver.
>
> > https://patchwork.kernel.org/project/linux-usb/patch/20200803065105.8997-1-yzc666@netease.com/
> >
> > We could try setting a large value as suggested there and it should
> > hopefully
> > solve the issue you are seeing.
>
> Why can't we break the rx_urb_size dependency on MTU automatically when
> pass_through or qmi_wwan internal muxing is enabled? Preferably with
> some fixed default size which would Just Work for everyone.
>

That default fixed size you're suggesting for the rx_urb_size, isn't
it supposed to have the same logical meaning as RMNET_MAX_PACKET_SIZE
at the end?

-- 
Aleksander
https://aleksander.es