linux-kernel - Re: [PATCH net-next v4 00/12] Add support for OPEN Alliance 10BASE-T1x MACPHY Serial Interface

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Date: Wed, 8 May 2024 13:05:12 +0000
From: <Parthiban.Veerasooran@...rochip.com>
To: <andrew@...n.ch>
CC: <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
	<pabeni@...hat.com>, <horms@...nel.org>, <saeedm@...dia.com>,
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	<linux-kernel@...r.kernel.org>, <corbet@....net>,
	<linux-doc@...r.kernel.org>, <robh+dt@...nel.org>,
	<krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
	<devicetree@...r.kernel.org>, <Horatiu.Vultur@...rochip.com>,
	<ruanjinjie@...wei.com>, <Steen.Hegelund@...rochip.com>,
	<vladimir.oltean@....com>, <UNGLinuxDriver@...rochip.com>,
	<Thorsten.Kummermehr@...rochip.com>, <Pier.Beruto@...emi.com>,
	<Selvamani.Rajagopal@...emi.com>, <Nicolas.Ferre@...rochip.com>,
	<benjamin.bigler@...nformulastudent.ch>
Subject: Re: [PATCH net-next v4 00/12] Add support for OPEN Alliance
 10BASE-T1x MACPHY Serial Interface

Hi Andrew,

On 23/04/24 4:53 am, Andrew Lunn wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> On Mon, Apr 22, 2024 at 10:08:23PM +0200, Andrew Lunn wrote:
>>> Testing Details:
>>> ----------------
>>> The driver performance was tested using iperf3 in the below two setups
>>> separately.
>>>
>>> Setup 1:
>>> --------
>>> Node 0 - Raspberry Pi 4 with LAN8650 MAC-PHY
>>> Node 1 - Raspberry Pi 4 with EVB-LAN8670-USB USB Stick
>>>
>>> Setup 2:
>>> --------
>>> Node 0 - SAMA7G54-EK with LAN8650 MAC-PHY
>>> Node 1 - Raspberry Pi 4 with EVB-LAN8670-USB USB Stick
>>
>> Would it be possible to chain these two setups together by adding two
>> USB dongles to one of the Ri 4s? If i remember correctly, there were
>> reports of issues when two devices were using the framework at once.
> 
> Sorry, that makes no sense. Your USB device is unlikely to be doing
> USB->SPI->MAC-PHY. Do you have two LAN8650 MAC-PHY you can connect to
> one host?
Yes. I tried this test. It works as expected.

Setup:
------

-------------------      ---------------------------
|     RPI4 1      |      |           RPI4 2        |
| --------------- | N/W 1| ----------------------- |
| | 1st LAN8651 | |<---->| | 1st EVB-LAN8670-USB | |
| --------------- |      | ----------------------- |
|                 |      |                         |
| --------------- | N/W 2| ----------------------- |
| | 2nd LAN8651 | |<---->| | 2nd EVB-LAN8670-USB | |
| --------------- |      | ----------------------- |
-------------------      ---------------------------

        |---> 1st LAN8651 ---> IP: 192.168.5.100
RPI4 1 |
        |---> 2nd LAN8651 ---> IP: 192.168.5.100

        |---> 1st EVB-LAN8670-USB ---> IP: 192.168.5.101
RPI4 2 |
        |---> 2nd EVB-LAN8670-USB ---> IP: 192.168.6.101

Test case 1:
------------
  RPI4 1 (Sender):
  ----------------
   $ iperf3 -c 192.168.5.101 -u -b 5M -i 1 -t 0 -p 5001
   $ iperf3 -c 192.168.6.101 -u -b 5M -i 1 -t 0 -p 5002
  RPI4 2 (Receiver):
  ------------------
   $ iperf3 -s -p 5001
  RPI4 3 (Receiver):
  ------------------
   $ iperf3 -s -p 5002
  Result on RPI4 side:
  --------------------
   Each LAN8651 transmits 5Mbps without any error.

Test case 2:
------------
  RPI4 1 (Sender):
  ----------------
   $ iperf3 -c 192.168.5.101 -u -b 10M -i 1 -t 0 -p 5001
   $ iperf3 -c 192.168.6.101 -u -b 10M -i 1 -t 0 -p 5002
  RPI4 2 (Receiver):
  ------------------
   $ iperf3 -s -p 5001
  RPI4 3 (Receiver):
  ------------------
   $ iperf3 -s -p 5002
  Result on RPI4 side:
  --------------------
   Each LAN8651 transmitting approximately 5 or 6Mbps without any error.

Test case 3:
-----------------------
  RPI4 1 (Receiver):
  ----------------
   $ iperf3 -s -p 5001
   $ iperf3 -s -p 5002
  RPI4 2 (Sender):
  ----------------
   $ iperf3 -c 192.168.5.100 -u -b 5M -i 1 -t 0 -p 5001
  RPI4 3 (Sender):
  ----------------
   $ iperf3 -c 192.168.6.100 -u -b 5M -i 1 -t 0 -p 5002
  Result on RPI4 side:
  --------------------
   Each LAN8651 received 5Mbps without any error.

Test case 4:
-----------------------
  RPI4 1 (Receiver):
  ------------------
   $ iperf3 -s -p 5001
   $ iperf3 -s -p 5002
  RPI4 2 (Sender):
  ----------------
   $ iperf3 -c 192.168.5.100 -u -b 10M -i 1 -t 0 -p 5001
  RPI4 3 (Sender):
  ----------------
   $ iperf3 -c 192.168.6.100 -u -b 10M -i 1 -t 0 -p 5002
  Result on RPI4 side:
  --------------------
   Each LAN8651 received approximately 3Mbps with lot of "Receive buffer 
overflow error". I think it is expected as the single SPI master has to 
serve both LAN8651 at the same time and both LAN8651 will be receiving 
10Mbps on each.

Please let me know if I have any misunderstanding here or you need more 
details on the test cases.

Best regards,
Parthiban V
> 
>      Andrew
>