linux-kernel - Re: [PATCH net-next RFC] selftests: net: add netpoll basic functionality test

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Message-ID: <20250613174233.0dd5e7c1@kernel.org>
Date: Fri, 13 Jun 2025 17:42:33 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Breno Leitao <leitao@...ian.org>
Cc: Willem de Bruijn <willemdebruijn.kernel@...il.com>, Andrew Lunn
 <andrew+netdev@...n.ch>, "David S. Miller" <davem@...emloft.net>, Eric
 Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, Shuah Khan
 <shuah@...nel.org>, linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
 linux-kselftest@...r.kernel.org, ast@...nel.org
Subject: Re: [PATCH net-next RFC] selftests: net: add netpoll basic
 functionality test

On Fri, 13 Jun 2025 05:47:50 -0700 Breno Leitao wrote:
> > Or is there another way that the packets could be observed, e.g.,
> > counters.  
> 
> Unfortunately netpoll doesn't expose any data, thus, it is hard to get
> it. 
> 
> I have plans to create a configfs for netpoll, so, we can check for
> these numbers (as also configure some pre-defined values today, such as
> USEC_PER_POLL, MAX_SKBS, ip6h->version = 6; ip6h->priority = 0, etc.
> 
> In fact, I've an private PoC for this, but, I am modernizing the code
> first, and creating some selftests to help me with those changes later
> (given we have very little test on netpoll, and I aim to improve this,
> given how critical it is for some datacenter designs).

FWIW you can steal bpftrace integration from this series:
https://lore.kernel.org/all/20250421222827.283737-22-kuba@kernel.org/