netdev - Re: [PATCH net-next] qmi_wwan: Increase headroom for QMAP SKBs

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Message-ID: <CAKfDRXh2WmT=aAU9CZg=AniW=qOQ4XLHVcYHnjvX8f+CguZBsw@mail.gmail.com>
Date:   Wed, 6 Jan 2021 16:18:29 +0100
From:   Kristian Evensen <kristian.evensen@...il.com>
To:     Bjørn Mork <bjorn@...k.no>
Cc:     Network Development <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next] qmi_wwan: Increase headroom for QMAP SKBs

Hi Bjørn,

On Wed, Jan 6, 2021 at 3:31 PM Bjørn Mork <bjorn@...k.no> wrote:
> Nice work!

Thanks a lot!

> Just wondering: Will the same problem affect the usbnet allocated skbs
> as well in case of raw-ip? They will obviously be large enough, but the
> reserved headroom probably isn't when we put an IP packet there without
> any L2 header?

You are right, I completely forgot about those SKBs. I will try to
find some time to investigate the non-QMAP performance, if a similar
fix (I guess an skb_reserve after the case-statement is enough) will
have an effect and submit a follow-up patch in case. Thanks for
reminding me, I have switched to only use QMAP :)

BR,
Kristian