netdev - Re: lan78xx and phy_state

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Date:   Tue, 15 Oct 2019 19:16:53 +0200
From:   Daniel Wagner <dwagner@...e.de>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     bcm-kernel-feedback-list@...adcom.com,
        linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        Woojung Huh <woojung.huh@...rochip.com>,
        UNGLinuxDriver@...rochip.com, netdev@...r.kernel.org
Subject: Re: lan78xx and phy_state_machine

Hi Andrew,

On Tue, Oct 15, 2019 at 02:53:27AM +0200, Andrew Lunn wrote:
> On Mon, Oct 14, 2019 at 04:06:04PM +0200, Daniel Wagner wrote:
> > Hi,
> > 
> > I've trying to boot a RPi 3 Model B+ in 64 bit mode. While I can get
> > my configuratin booting with v5.2.20, the current kernel v5.3.6 hangs
> > when initializing the eth interface.
> > 
> > Is this a know issue? Some configuration issues?
> 
> Hi Daniel
> 
> Please could you add a WARN_ON(1); in phy_queue_state_machine() and
> post the stack dump. That might help us figure out what is going on.

I tried to get a stack dump from the WARN_ON(1). The 'make defconfig'
seems not to enable it(?). Anyway I played a bit and noticed, that
depending which additional debug config switch is enabled the
problem disappears. The boot timing is important it seems.

After the feedback I got so far, it think my setup is 'special' in
sofar I don't boot from eMMC. Instead I rely on TFTP and NFS for
rootfs:

 - kernel is configured as 'make defconfig' +

	#
	# Built in drivers
	#
	CONFIG_USB_LAN78XX=y

	#
	# Networking
	#
	CONFIG_PACKET=y
	CONFIG_UNIX=y
	CONFIG_INET=y
	CONFIG_IP_PNP=y
	CONFIG_IP_PNP_DHCP=y

	# NFS
	CONFIG_NFS_FS=y
	CONFIG_NFS_V4=y
	CONFIG_NFS_V4_1=y
	CONFIG_NFS_V4_2=y

	#
	# Debugging
	#
	CONFIG_PRINTK_TIME=y
	CONFIG_DEBUG_KERNEL=y
	CONFIG_EARLY_PRINTK=y
	CONFIG_MESSAGE_LOGLEVEL_DEFAULT=7

	# Embedded config to kernel. /proc/config.gz
	CONFIG_IKCONFIG=y
	CONFIG_IKCONFIG_PROC=y

	CONFIG_KEXEC=y

 - u-boot enables network interface, does DHCP
 - fetches a PXE image
 - PXE loads DTB, kernel and starts the kernel
 - rootfs is supposed to be provided via NFS

Could it be that the networking interface is still running (from
u-boot and PXE) when the drivers is setting it up and the workqueue is
premature kicked to work?

Anyway, I keep trying to get some trace out of it.

Thanks,
Daniel