netdev - Re: [PATCH net-next 0/7] Polling be gone on LAN95xx

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Message-ID: <2a436486-a54d-a9b3-d839-232a38653af3@gmail.com>
Date:   Tue, 3 May 2022 16:26:58 +0200
From:   Ferry Toth <fntoth@...il.com>
To:     Lukas Wunner <lukas@...ner.de>
Cc:     Steve Glendinning <steve.glendinning@...well.net>,
        UNGLinuxDriver@...rochip.com, Oliver Neukum <oneukum@...e.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        linux-usb@...r.kernel.org, Andre Edich <andre.edich@...rochip.com>,
        Oleksij Rempel <o.rempel@...gutronix.de>,
        Martyn Welch <martyn.welch@...labora.com>,
        Gabriel Hojda <ghojda@...urs.ro>,
        Christoph Fritz <chf.fritz@...glemail.com>,
        Lino Sanfilippo <LinoSanfilippo@....de>,
        Philipp Rosenberger <p.rosenberger@...bus.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Russell King <linux@...linux.org.uk>
Subject: Re: [PATCH net-next 0/7] Polling be gone on LAN95xx

Hi

On 03-05-2022 10:26, Lukas Wunner wrote:
> On Mon, May 02, 2022 at 10:33:06PM +0200, Ferry Toth wrote:
>> Op 27-04-2022 om 07:48 schreef Lukas Wunner:
>>> Do away with link status polling on LAN95XX USB Ethernet
>>> and rely on interrupts instead, thereby reducing bus traffic,
>>> CPU overhead and improving interface bringup latency.
>> Tested-by: Ferry Toth <fntoth@...il.com> (Intel Edison-Arduino)
> Thank you!
>
>> While testing I noted another problem. I have "DMA-API: debugging enabled by
>> kernel config" and this (I guess) shows me before and after the patches:
>>
>> ------------[ cut here ]------------
>> DMA-API: xhci-hcd xhci-hcd.1.auto: cacheline tracking EEXIST, overlapping
>> mappings aren't supported
> That is under investigation here:
> https://bugzilla.kernel.org/show_bug.cgi?id=215740
>
> It's apparently a long-standing bug in the USB core which was exposed
> by a new WARN() check introduced in 5.14.

I'm not sure this is correct. The issue happens for me only when 
connecting the SMSC9414.

Other usb devices I have (memory sticks, wifi, bluetooth) do not trigger 
this.

I think we need to consider it might be a valid warning. It seems to be 
originating from the same "Workqueue: usb_hub_wq hub_event" though.

> Thanks,
>
> Lukas