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Re: [lwip-users] netif->hwaddr_len of loopback interface is not ETH_HWAD
From: |
goldsimon |
Subject: |
Re: [lwip-users] netif->hwaddr_len of loopback interface is not ETH_HWADDR_LEN |
Date: |
Mon, 06 Jul 2020 19:38:52 +0200 |
User-agent: |
K-9 Mail for Android |
Am 6. Juli 2020 19:09:51 MESZ schrieb "Laurenz Altenmüller"
<lwip-users@laure.nz>:
>Hi,
>
>I want to unit test some embedded firmware on native host arch by
>building it against the lwip unix port (latest master). Right now I
>want
>to add a fake IP and MAC to the ARP table with
>`etharp_add_static_entry()` so that the tested function can find it
>when
>it uses `etharp_query()` and then `etharp_find_addr()` in its
>implementation. For all this I'm using the netif I get from
>`netif_get_loopif()`.
>
>Unfortunately I hit the assert in etharp.c:1139 ("netif->hwaddr_len
>must
>be the same as ETH_HWADDR_LEN for etharp!"). Using the debugger I can
>confirm that `netif->hwaddr_len` of my loopback netif is 0.
>
>Should I even be able to use the loopback interface for ARP things?
No, the loopif is not meant to work with ARP. Our own unit tests use a
dedicated tiny test netif for such tests.
Regards,
Simon
> Am
>I
>just missing some initialization? (In my test's `setUp()` I call
>`sys_init(); mem_init(); netif_init(); test_netif=netif_get_loopif();`)
>
>Cheers
>Laurenz
>
>
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