Re: [PATCH iproute2-next v3] iproute2: Add 'netshaper' command to 'ip link' for netdev shaping

[Jakub Kicinski <kuba@kernel.org>]

On Sun, 24 Aug 2025 06:40:17 -0700 Erni Sri Satya Vennela wrote:
> > Sorry, I wasn't very precise, it supports printing the string messages.
> > But nothing that requires actually understanding the message.
> > No bad attribute errors, no missing attribute errors, no policy errors.  
> 
> Are you referring to the following error logs from the ynl tool?
> 
> $./tools/net/ynl/pyynl/cli.py
>  --spec Documentation/netlink/specs/net_shaper.yaml
>  --do set 
>  --json '{"ifindex":'3',
> 	  "handle":{"scope": "netdev", "id":'1' },
> 	  "bw-max": 200001000 }'
> 
> Netlink error: Invalid argument
> nl_len = 92 (76) nl_flags = 0x300 nl_type = 2
>         error: -22
>         extack: {'msg': 'mana: Please use multiples of 100Mbps for
> bandwidth'}

Not 'msg', the other types, for example miss-type, bad-attr:

$ ynl --family net_shaper --do get
Netlink error: Invalid argument
nl_len = 44 (28) nl_flags = 0x300 nl_type = 2
	error: -22
	extack: {'miss-type': 'ifindex', 'miss-type-doc': 'Interface index owning the specified shaper.'}

$ ynl --family net_shaper --do get --json '{"ifindex": 1}'
Netlink error: Operation not supported
nl_len = 44 (28) nl_flags = 0x300 nl_type = 2
	error: -95
	extack: {'bad-attr': '.ifindex'}

> If yes, would it be reasonable to add support in iproute2 itself for
> displaying such error logs?