netdev - Re: [PATCH] net/tun: expose queue utilization stats via ethtool

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Message-Id: <20250522142654.96438-1-alex-shalimov@yandex-team.ru>
Date: Thu, 22 May 2025 17:26:54 +0300
From: Alexander Shalimov <alex-shalimov@...dex-team.ru>
To: dxu@...uu.xyz
Cc: alex-shalimov@...dex-team.ru,
	andrew@...n.ch,
	bpf@...r.kernel.org,
	davem@...emloft.net,
	edumazet@...gle.com,
	jacob.e.keller@...el.com,
	jasowang@...hat.com,
	kuba@...nel.org,
	linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org,
	pabeni@...hat.com,
	willemdebruijn.kernel@...il.com
Subject: Re: [PATCH] net/tun: expose queue utilization stats via ethtool

>> Thanks a lot for your response, Daniel. Good to know that we can get
>> this information without kernel changes. And I learned something new
>> :) Replicated your examples.
>
> Nice! Feel free to CC me if you have other stuff in the future.
> 
> Bug fix for parsing implicit module BTF up here:
> https://github.com/bpftrace/bpftrace/pull/4137

Daniel and Willem, I appreciate you help!

My mistake was that we had tun configured as a module (CONFIG_TUN=m), and I
didn't explicitly specify the module name in the kprobe. Also, thank you for
pointing out that recent kernels have added the 'priv' field to net_device.
As a result, the script has now become much more universal and simpler.

Now we will think about how to efficiently implement monitoring on top of
our bpftrace script, which dynamically reports queue utilization.