netdev - Re: [PATCH] skbuff: Fix a race between coalescing and releasing SKBs

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Message-ID: <20230406075908.5ebcb5a0@kernel.org>
Date:   Thu, 6 Apr 2023 07:59:08 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Liang Chen <liangchen.linux@...il.com>
Cc:     Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Alexander Duyck <alexander.duyck@...il.com>, hawk@...nel.org,
        davem@...emloft.net, pabeni@...hat.com, netdev@...r.kernel.org
Subject: Re: [PATCH] skbuff: Fix a race between coalescing and releasing
 SKBs

On Thu, 6 Apr 2023 19:54:23 +0800 Liang Chen wrote:
> > > Same feeling on my side.
> > > I prefer not trying to merge mixed pp_recycle skbs "just because we
> > > could" at the expense
> > > of adding more code in a fast path.  
> >
> > +1 here.  The intention of recycling was to affect the normal path as
> > less as possible.  On top of that, we've some amount of race
> > conditions over the years, trying to squeeze more performance with
> > similar tricks.  I'd much rather be safe here, since recycling by
> > itself is a great performance boost
> 
> Sorry, I didn't check my inbox before sending out the v2 patch.

I can discard v2 from patchwork, let's continue the conversation
here.

> Yeah, It is a bit complicated as we expected. The patch is sent out.
> Please take a look to see if it is the way to go, or We should stay
> with the current patch for simplicity reasons. Thanks!

Sounds like you know what Eric and Ilias agreed with, I'm a bit
confused.. are we basically going back to v1? (hopefully with coding
style fixed)