Re: [PATCH v3 0/8] arm64: rockchip: Initial GeekBox enablement

[Tomeu Vizoso]

On 11 March 2016 at 10:09, Giuseppe CAVALLARO <peppe.cavallaro@xxxxxx> wrote:
> On 3/10/2016 5:47 PM, Dinh Nguyen wrote:
>>
>> On Thu, Mar 10, 2016 at 3:13 AM, Giuseppe CAVALLARO
>> <peppe.cavallaro@xxxxxx> wrote:
>>>
>>> On 3/9/2016 5:31 PM, Dinh Nguyen wrote:
>>>>
>>>>
>>>> On Wed, Mar 9, 2016 at 8:53 AM, Giuseppe CAVALLARO
>>>> <peppe.cavallaro@xxxxxx> wrote:
>>>>>
>>>>>
>>>>> Hi Tomeu, Dinh, Andreas
>>>>>
>>>>> I need a sum and help from you to go ahead on the
>>>>> tx timeout.
>>>>>
>>>>> The "stmmac: MDIO fixes" seems to be the candidate to
>>>>> fix the phy connection and I will send the V2 asap (Andreas' comment).
>>>>>
>>>>> So, supposing the probe is ok and phy is connected,
>>>>> I need your input ...
>>>>>
>>>>>    Tomeu: after revering the 0e80bdc9a72d (stmmac: first frame
>>>>>           prep at the end of xmit routine) the network is
>>>>>           not stable and there is a timeout after a while.
>>>>>           The box has 3.50 with normal desc settings.
>>>>>
>>>>>    Dinh: the network is ok, I wonder if you can share a boot
>>>>>          log just to understand if the normal or enhanced
>>>>>          descriptors are used.
>>>>>
>>>>
>>>> Here it is:
>>>
>>>
>>> ...
>>>>
>>>>
>>>> [    0.850523] stmmac - user ID: 0x10, Synopsys ID: 0x37
>>>> [    0.855570]  Ring mode enabled
>>>> [    0.858611]  DMA HW capability register supported
>>>> [    0.863128]  Enhanced/Alternate descriptors
>>>> [    0.867482]  Enabled extended descriptors
>>>> [    0.871482]  RX Checksum Offload Engine supported (type 2)
>>>> [    0.876948]  TX Checksum insertion supported
>>>> [    0.881204]  Enable RX Mitigation via HW Watchdog Timer
>>>> [    0.886863] socfpga-dwmac ff702000.ethernet eth0: No MDIO subnode
>>>> found
>>>> [    0.899090] libphy: stmmac: probed
>>>> [    0.902484] eth0: PHY ID 00221611 at 4 IRQ POLL (stmmac-0:04) active
>>>
>>>
>>>
>>> Thx Dinh, so you are using the Enhanced/Alternate descriptors
>>> I am debugging on my side on a setup with normal descriptors, I let you
>>> know
>>>
>>
>> Doesn't the printout "Enhanced/Alternate descriptors"  mean that I'm using
>> Enhanced/Alternate descriptors?
>
>
> yes this means that you have the Databook 3.70a and, from the HW
> capability register, the driver will use the Enhanced/Alternate
> descriptors. This is the same HW I am using on my side where the
> stmmac is working fine.
>
> In the case where it is failing on net-next, although on Databook 3.50a,
> the HW  capability register says that there is no enhanced descriptors
> and the driver uses the normal ones.
>
> Tomeu, I kindly ask you to try the patch attached. I found a bug on Tx
> path for normal descriptors. Please let me know if this help.
> Also let me know if we actually need to revert the 0e80bdc9a72d.

Hi Peppe,

with that patch I don't see any difference at all in my setup.

So to be clear, with these commits on top of next-20160314, I still
get the hang during boot:

209afef6f0cd ARM: dts: rockchip: Add mdio node to ethernet node
2315acc6cf7f Revert "stmmac: first frame prep at the end of xmit routine"
b5e08e810c63 stmmac: fix tx prepare for normal desc
37c15a31d850 i2c: immediately mark ourselves as registered
4342eec3c5a2 Add linux-next specific files for 20160314

[   27.521026] WARNING: CPU: 1 PID: 0 at net/sched/sch_generic.c:303
dev_watchdog+0x284/0x288
[   27.529460] NETDEV WATCHDOG: eth0 (rk_gmac-dwmac): transmit queue 0 timed out

https://git.collabora.com/cgit/user/tomeu/linux.git/log/?h=broken-eth-on-rock2

> I am trying to find some HW where test the normal descriptors to
> speed-up the tests on my side directly.

Maybe get your tree in kernelci.org? I'm not sure if it's currently
doing any nfsroot boots, though.

Regards,

Tomeu

> Let me know and thx in advance.
>
> Regards,
> Peppe
>
>>
>> Dinh
>>
>