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Date:   Sun, 17 Feb 2019 15:40:26 +0000
From:   Russell King - ARM Linux admin <linux@...linux.org.uk>
To:     Heiner Kallweit <hkallweit1@...il.com>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: No traffic with Marvell switch and latest linux-next

On Sun, Feb 17, 2019 at 04:34:32PM +0100, Heiner Kallweit wrote:
> When testing latest linux-next on the ZII DTU I face the issue that no
> traffic is flowing over the switch ports, even though in dmesg
> everything looks good. Also PHY properly establishes the link.
> 
> With 4.20.10 I don't have the issue and with 5.0-rc6 also not.
> However on 5.0-rc6 I got the following, also number of network
> interrupts seems to be very high (few minutes after boot).
> Any idea what's going on?
> 
> Andrew, IIRC you recently fixed some interrupt-related issue:
> 7ae710f9f8b2 ("gpio: vf610: Mask all GPIO interrupts")
> But the description doesn't seem to match this trace.

I have a fix for the trace you have below, but it has nothing to do
with no traffic.  I'll send it out shortly.

Which protocol are you using (ipv4 or ipv6)?  Have you setup a
bridge device containing the ports you wish to switch network
traffic.  Without a bridge device, DSA will by default treat each
port as a separate port.  The other thing that gets people is the
ethernet interface connected to the DSA switch must be up _before_
bringing up any of the switch ports.

> 
> irq 56: nobody cared (try booting with the "irqpoll" option)
> CPU: 0 PID: 577 Comm: irq/38-400d1000 Not tainted 5.0.0-rc6 #1
> Hardware name: Freescale Vybrid VF5xx/VF6xx (Device Tree)
> [<8010c898>] (unwind_backtrace) from [<8010ad98>] (show_stack+0x10/0x14)
> [<8010ad98>] (show_stack) from [<80149660>] (__report_bad_irq+0x38/0xb0)
> [<80149660>] (__report_bad_irq) from [<80149478>] (note_interrupt+0x10c/0x294)
> [<80149478>] (note_interrupt) from [<80149cac>] (handle_nested_irq+0xd8/0xf4)
> [<80149cac>] (handle_nested_irq) from [<80384a64>] (mv88e6xxx_g2_irq_thread_fn+0x90/0xc0)
> [<80384a64>] (mv88e6xxx_g2_irq_thread_fn) from [<80149c60>] (handle_nested_irq+0x8c/0xf4)
> [<80149c60>] (handle_nested_irq) from [<8037ccd0>] (mv88e6xxx_g1_irq_thread_work+0x98/0xcc)
> [<8037ccd0>] (mv88e6xxx_g1_irq_thread_work) from [<80147ff4>] (irq_thread_fn+0x1c/0x78)
> [<80147ff4>] (irq_thread_fn) from [<80148280>] (irq_thread+0x124/0x1cc)
> [<80148280>] (irq_thread) from [<8012f8e8>] (kthread+0x140/0x148)
> [<8012f8e8>] (kthread) from [<801010e8>] (ret_from_fork+0x14/0x2c)
> Exception stack(0x9f6c7fb0 to 0x9f6c7ff8)
> 7fa0:                                     00000000 00000000 00000000 00000000
> 7fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
> 7fe0: 00000000 00000000 00000000 00000000 00000013 00000000
> handlers:
> [<b09c70df>] irq_default_primary_handler threaded [<44d6803f>] phy_interrupt
> Disabling IRQ #56
> 
> 
> 36:    2030566   mscm-ir  79 Edge      400d1000.ethernet
>  38:    1010437  gpio-vf610   2 Level     400d1000.ethernet-1:00
>  42:          0  mv88e6xxx-g1   3 Edge      mv88e6xxx-g1-atu-prob
>  44:          0  mv88e6xxx-g1   5 Edge      mv88e6xxx-g1-vtu-prob
>  46:    1010435  mv88e6xxx-g1   7 Edge      mv88e6xxx-g2
>  49:          0  mv88e6xxx-g2   1 Edge      mv88e6xxx-1:01
>  53:          0  mv88e6xxx-g2   5 Edge      mv88e6xxx-1:05
>  54:          0  mv88e6xxx-g2   6 Edge      mv88e6xxx-1:06
>  56:     100000  mv88e6xxx-g2   8 Edge      mv88e6xxx-1:08
>  63:          0  mv88e6xxx-g2  15 Edge      mv88e6xxx-watchdog
> 
> Heiner
> 

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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