netdev - How to display IPv4 array?

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Date: Tue, 12 Mar 2024 18:08:33 +0800
From: Hangbin Liu <liuhangbin@...il.com>
To: Jakub Kicinski <kuba@...nel.org>
Cc: Donald Hunter <donald.hunter@...il.com>, netdev@...r.kernel.org
Subject: How to display IPv4 array?

Hi Jakub,

I plan to add bond support for Documentation/netlink/specs/rt_link.yaml. While
dealing with the attrs. I got a problem about how to show the bonding arp/ns
targets. Because the arp/ns targets are filled as an array[1]. I tried
something like:

  -
    name: linkinfo-bond-attrs
    name-prefix: ifla-bond-
    attributes:
      -
        name: arp-ip-target
        type: nest
        nested-attributes: ipv4-addr
  -
    name: ipv4-addr
    attributes:
      -
        name: addr
        type: binary
        display-hint: ipv4

But this failed with error: Exception: Space 'ipv4-addr' has no attribute with value '0'
Do you have any suggestion?

[1] https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/tree/drivers/net/bonding/bond_netlink.c#n670

Thanks
Hangbin