linux-kernel - Re: [PATCH] net: usb: qmi_wwan: Fix for packets being rejected in the ring buffer used by the xHCI controller.

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Date:   Mon, 07 Sep 2020 09:45:21 +0200
From:   Bjørn Mork <bjorn@...k.no>
To:     Kristian Evensen <kristian.evensen@...il.com>
Cc:     Daniele Palmas <dnlplm@...il.com>,
        Paul Gildea <paul.gildea@...il.com>,
        "davem\@davemloft.net" <davem@...emloft.net>,
        "netdev\@vger.kernel.org" <netdev@...r.kernel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: usb: qmi_wwan: Fix for packets being rejected in the ring buffer used by the xHCI controller.

Kristian Evensen <kristian.evensen@...il.com> writes:

> Hi all,
>
> I was able to trigger the same issue as reported by Paul, and came
> across this patch (+ Daniele's other patch and thread on the libqmi
> mailing list). Applying Paul's fix solved the problem for me, changing
> the MTU of the QMI interface now works fine. Thanks a lot to everyone
> involved!
>
> I just have one question, is there a specific reason for the patch not
> being resubmitted or Daniele's work not resumed? I do not use any of
> the aggregation-stuff, so I don't know how that is affected by for
> example Paul's change. If there is anything I can do to help, please
> let me know.

Thanks for bringing this back into our collective memory.  The patch
never made it to patchwork, probably due to the formatting issues, and
was just forgotten.

There are no other reasons than Daniele's concerns in the email you are
replying to, AFAIK.  The issue pointed out by Paull should be fixed, but
the fix must not break aggregation..

This is a great opportunity for you to play with QMAP aggregation :-)
Wouldn't it be good to do some measurements to document why it is such a
bad idea?

Bjørn