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

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Message-ID: <20220503082612.GA21515@wunner.de>
Date:   Tue, 3 May 2022 10:26:12 +0200
From:   Lukas Wunner <lukas@...ner.de>
To:     Ferry Toth <fntoth@...il.com>
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

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.

Thanks,

Lukas