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

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Message-ID: <20250824134017.GA2917@linuxonhyperv3.guj3yctzbm1etfxqx2vob5hsef.xx.internal.cloudapp.net>
Date: Sun, 24 Aug 2025 06:40:17 -0700
From: Erni Sri Satya Vennela <ernis@...ux.microsoft.com>
To: Jakub Kicinski <kuba@...nel.org>
Cc: Stephen Hemminger <stephen@...workplumber.org>, dsahern@...il.com,
	netdev@...r.kernel.org, haiyangz@...rosoft.com,
	shradhagupta@...ux.microsoft.com, ssengar@...rosoft.com,
	dipayanroy@...rosoft.com, ernis@...rosoft.com
Subject: Re: [PATCH iproute2-next v3] iproute2: Add 'netshaper' command to
 'ip link' for netdev shaping

On Thu, Aug 21, 2025 at 07:12:59AM -0700, Jakub Kicinski wrote:
> On Thu, 21 Aug 2025 04:06:07 -0700 Erni Sri Satya Vennela wrote:
> > > Somewhat related -- what's your take on integrating / vendoring in YNL?
> > > mnl doesn't provide any extack support..  
> > 
> > I have done some tests and found that if we install pkg-config and
> > libmnl packages beforehand. The extack error messages from the kernel
> > are being printed to the stdout.
> 
> 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'}

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