netdev - Re: [PATCH net-next] net: add the ifindex for trace_net_dev_xmit

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Message-Id: <3D522AB4-7864-4E5B-8B7C-F2DF01240314@bamaicloud.com>
Date: Wed, 22 Oct 2025 21:23:58 +0800
From: Tonghao Zhang <tonghao@...aicloud.com>
To: Ido Schimmel <idosch@...sch.org>
Cc: Jakub Kicinski <kuba@...nel.org>,
 netdev@...r.kernel.org,
 Eran Ben Elisha <eranbe@...lanox.com>,
 Jiri Pirko <jiri@...lanox.com>,
 Cong Wang <xiyou.wangcong@...il.com>
Subject: Re: [PATCH net-next] net: add the ifindex for
 trace_net_dev_xmit_timeout



> On Oct 22, 2025, at 18:45, Ido Schimmel <idosch@...sch.org> wrote:
> 
> On Wed, Oct 22, 2025 at 04:31:34PM +0800, Tonghao Zhang wrote:
>>> On Oct 22, 2025, at 08:10, Jakub Kicinski <kuba@...nel.org> wrote:
>>> 
>>> On Tue, 21 Oct 2025 17:19:00 +0800 Tonghao Zhang wrote:
>>>> In a multi-network card or container environment, provide more accurate information.
>>> 
>>> Why do you think that ifindex is more accurate than the name?
>>> Neither is unique with netns..
>> I thought ifindex was globally unique, but in fact, different namespaces may have the same ifindex value. What about adding the ns.inum inode ?
> 
> The netns cookie is probably better. See this thread:
> 
> https://lore.kernel.org/netdev/c28ded3224734ca62187ed9a41f7ab39ceecb610.camel@fejes.dev/
That's a good idea, it's helpful to me.
> 
> You can also retrieve it by attaching a BPF program to the tracepoint.
>