[U-Boot] Errors when starting sandbox

[Joe Hershberger]

On Mon, Oct 1, 2018 at 4:27 PM, Simon Glass <sjg at chromium.org> wrote:
> Hi Joe,
>
> On 1 October 2018 at 15:14, Joe Hershberger <joe.hershberger at ni.com> wrote:
>>
>> Hi Simon,
>>
>> On Mon, Oct 1, 2018 at 12:32 PM, Simon Glass <sjg at chromium.org> wrote:
>> > Hi Joe,
>> >
>> > When I start sandbox now I see these errors every time. It is possible
>> > to fix this?
>> >
>> > $ u-boot -D
>> > ...
>> > Warning: host_lo MAC addresses don't match:
>> > Address in ROM is          ea:06:97:67:f4:b6
>> > Address in environment is  00:00:11:22:33:44
>> >
>> > Warning: host_eth0 MAC addresses don't match:
>> > Address in ROM is          ea:06:97:67:f4:b6
>> > Address in environment is  00:00:11:22:33:45
>> >
>> > Warning: host_enp0s31f6 using MAC address from ROM
>> >
>> > Warning: host_eth6 MAC addresses don't match:
>> > Address in ROM is          ea:06:97:67:f4:b6
>> > Address in environment is  00:00:11:22:33:46
>> >
>> > Warning: host_docker_gwbridge using MAC address from ROM
>> >
>> > Warning: host_docker0 MAC addresses don't match:
>> > Address in ROM is          ca:07:52:28:25:66
>> > Address in environment is  00:00:11:22:33:47
>> >
>> > Warning: host_veth1f6bcd2 using MAC address from ROM
>>
>> These are warnings based on commit b96ced9cdb6 (sandbox: eth-raw: Make
>> random MAC addresses available to eth-raw). Because we don't know the
>> number of interfaces that exist on the given host when we write the
>> sandbox.dts, we override the MAC addresses with random ones. In the
>> normal case (real hardware), we would warn, since the hardware should
>> know its interfaces.
>>
>> Do you have a proposed different approach? I don't like the idea of
>> adding sandbox checks in the core code that prints this warning, and
>> it also doesn't seem like a great idea to add a hook that doesn't warn
>> just for sandbox.
>>
>> I'm happy to work on this, but I didn't address it at the time because
>> I didn't see a clear way to do it that didn't degrade the code in
>> order to remove warnings in sandbox.
>
> Can we make it so that the addresses do actually match in sandbox?

The issue is that the eth(N)?addr lives in the default env and the
interfaces are discovered by drivers/net/sandbox-raw-bus.c. Currently
we make sure we don't "run out" of addresses defined in the env by
using a randomly generated one instead. Unfortunately, the env is
shared with all modes of sandbox, so while the addresses are not
shared when running sandbox.dts, they are required when running
test.dts.

Thoughts?

Thanks,
-Joe

> Regards,
> Simon
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