netdev - Re: [PATCH net-next v3 2/3] net: introduce abstraction for network memory

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Date: Wed, 10 Jan 2024 17:35:23 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Shakeel Butt <shakeelb@...gle.com>
Cc: Mina Almasry <almasrymina@...gle.com>, linux-kernel@...r.kernel.org,
 netdev@...r.kernel.org, kvm@...r.kernel.org,
 virtualization@...ts.linux.dev, "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, Stefan
 Hajnoczi <stefanha@...hat.com>, Stefano Garzarella <sgarzare@...hat.com>,
 David Howells <dhowells@...hat.com>, Jason Gunthorpe <jgg@...dia.com>,
 Christian König <christian.koenig@....com>, Yunsheng Lin
 <linyunsheng@...wei.com>, Willem de Bruijn
 <willemdebruijn.kernel@...il.com>
Subject: Re: [PATCH net-next v3 2/3] net: introduce abstraction for network
 memory

On Wed, 10 Jan 2024 09:50:08 -0800 Shakeel Butt wrote:
> On Thu, Jan 4, 2024 at 1:44 PM Jakub Kicinski <kuba@...nel.org> wrote:
> > You seem to be trying hard to make struct netmem a thing.
> > Perhaps you have a reason I'm not getting?  
> 
> Mina already went with your suggestion and that is fine. To me, struct
> netmem is more aesthetically aligned with the existing struct
> encoded_page approach, but I don't have a strong opinion one way or
> the other. However it seems like you have a stronger preference for
> __bitwise approach. Is there a technical reason or just aesthetic?

Yes, right above the text you quoted:

  The __bitwise annotation will make catching people trying
  to cast to struct page * trivial.

https://lore.kernel.org/all/20240104134424.399fee0a@kernel.org/