RE: Re: How to add eth1 to test device tree?

28 Mar 2023


      Hi Simon,
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-----Original Message-----
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From: Simon Glass <sjg@chromium.org mailto:sjg@chromium.org>
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Sent: Monday, March 27, 2023 3:15 PM
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To: Ehsan Mohandesi <emohandesi@linux.microsoft.com
mailto:emohandesi@linux.microsoft.com>
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Cc: u-boot@lists.denx.de mailto:u-boot@lists.denx.de;
swarren@nvidia.com mailto:swarren@nvidia.com; michal.simek@xilinx.com 
mailto:michal.simek@xilinx.com;
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guillaume.gardet@free.fr mailto:guillaume.gardet@free.fr
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Subject: [EXTERNAL] Re: How to add eth1 to test device tree?
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Hi Ehsan,
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On Tue, 28 Mar 2023 at 08:58, Ehsan Mohandesi
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<emohandesi@linux.microsoft.com
mailto:emohandesi@linux.microsoft.com> wrote:
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Hi All,
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When running the sandbox tests, I want to know how to enable eth1 in
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order to be able to test network features.
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The following command is used to run sandbox tests.
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./test/py/test.py -k testname.py
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I am specifically interested in running the network tests.
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./test/py/test.py -k test_net.py
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These Python tests use test.dts device tree which does not have eth1
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in it. I can replace the test.dts file with sandbox.dts to enable
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eth1 and run the network tests; however, I think there should be a
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better way to do it.
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Can anyone help me with this issue?
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When running U-Boot, the -T option could be used to tell it to use
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the test.dts or -D to use sandbox.dts; however, there is no such
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option when running test.py.
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Eth1 is needed in order to enable the network. Enabling the sandbox
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network is explained after line 250 in doc/arch/sandbox.rst.
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For more information, the following is the list of network
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interfaces when each device tree is used.
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**
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*arch/sandbox/dts/sandbox.dts**
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*Net:eth0: host_lo, *eth1: host_eth0*, eth2: host_br1, eth3:
eth@10002000
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*arch/sandbox/dts/test.dts*
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Net:eth0: eth@10002000, eth5: eth@10003000, eth3: sbe5, eth6:
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eth@10004000, eth4: dsa-test-eth, eth2: lan0, eth7: lan1
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You should write tests in C where possible. See [1].
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If you are just trying to try something out locally, then you can run
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a sandbox test without Python. See [2]. You can use the -D flag as
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usual. Of course you can't
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Network tests should generate their own traffic and check it
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internally, rather than relying on the real network features of the
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host machine. You can see test/dm/eth.c for that
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For local hacking you can change u_boot_console_sandbox.py.get_spawn()
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to pass -D instead of the -d xxx it currently does.
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So it depends on what you are trying to do.
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Regards,
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Simon
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[1]
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https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fu-
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boot.readthedocs.io%2Fen%2Flatest%2Fdevelop%2Ftests_writing.html&data=
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0 5%7C01%7Cemohandesi%40microsoft.com%7Ccb2205b7fa56490d6b0008db2ef
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ff21e%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C63815544908078
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1196%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzI
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iLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=qi8G4i64eXd
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S4VpzMz9F5LL3BcEh0C87%2BvsTBg4IRic%3D&reserved=0
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[2]
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https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fu-
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boot.readthedocs.io%2Fen%2Flatest%2Fdevelop%2Ftests_sandbox.html%23run
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ning-sandbox-tests-
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directly&data=05%7C01%7Cemohandesi%40microsoft.com%7Ccb2205b7fa564
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90d6b0008db2efff21e%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C
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638155449080781196%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMD
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AiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&s
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data=YiBTpwZ4sjvKAu9H%2B4%2BBGFJUjoe3zT5pERDtBA5oDms%3D&reserved
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=0
Let me add a little bit of information on my change and how I want to 
test it.
I have implemented the IPv6 network discovery and have sent it upstream. 
Now I am working on writing the sandbox tests. I have implemented some 
tests in C and one in Python when using C was not possible.
Tests written in C are in test/dm/eth.c and they use fake networks as 
you have instructed.
Test written in Python is in test/py/tests/test_net.py. The Python test 
is similar to the DHCP and TFTP tests where they deal with real network 
traffic. My question is how those tests succeed. Do they use eth1? For 
them to succeed, they need to be connected to a DHCP server or other 
servers. How do the users run such tests?

Ehsan Mohandesi

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