linux-kernel - Re: [PATCH] net: Revert tx queue length on partial failure in dev_qdisc_change_tx_queue

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Message-ID: <CAO9wTFgzNfPKBOY5XanjnUeE9FfAGovg02ZU6Q1TH-EnA52LAA@mail.gmail.com>
Date: Tue, 22 Jul 2025 21:51:47 +0530
From: Suchit K <suchitkarunakaran@...il.com>
To: Eric Dumazet <edumazet@...gle.com>
Cc: davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com, horms@...nel.org, 
	jhs@...atatu.com, xiyou.wangcong@...il.com, jiri@...nulli.us, sdf@...ichev.me, 
	kuniyu@...gle.com, aleksander.lobakin@...el.com, netdev@...r.kernel.org, 
	skhan@...uxfoundation.org, linux-kernel-mentees@...ts.linux.dev, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: Revert tx queue length on partial failure in dev_qdisc_change_tx_queue_len()

>
> WRITE_ONCE() is missing.

Oops, I'm sorry about that.

>
> > +               while (i >= 0) {
> > +                       qdisc_change_tx_queue_len(dev, &dev->_tx[i]);
>
> What happens if one of these calls fails ?
>
> I think a fix will be more complicated...

I did consider that, but since I didn’t have a solution, I assumed it
wouldn’t fail. I also have a question. In the Qdisc_ops structure,
there’s a function pointer for change_tx_queue_len, but I was only
able to find a single implementation which is
pfifo_fast_change_tx_queue_len. Is that the only one? Apologies if
this isn’t the right place to ask such questions. I’d really
appreciate any feedback. Thank you!