linux-kernel - Re: [RFC PATCH net-next v6 02/15] net: page_pool: create hooks for custom page providers

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date: Sun, 24 Mar 2024 16:35:13 -0700
From: Christoph Hellwig <hch@...radead.org>
To: Mina Almasry <almasrymina@...gle.com>
Cc: Christoph Hellwig <hch@...radead.org>, David Wei <dw@...idwei.uk>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org, linux-alpha@...r.kernel.org,
	linux-mips@...r.kernel.org, linux-parisc@...r.kernel.org,
	sparclinux@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org, bpf@...r.kernel.org,
	linux-kselftest@...r.kernel.org, linux-media@...r.kernel.org,
	dri-devel@...ts.freedesktop.org,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Jonathan Corbet <corbet@....net>,
	Richard Henderson <richard.henderson@...aro.org>,
	Ivan Kokshaysky <ink@...assic.park.msu.ru>,
	Matt Turner <mattst88@...il.com>,
	Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
	"James E.J. Bottomley" <James.Bottomley@...senpartnership.com>,
	Helge Deller <deller@....de>, Andreas Larsson <andreas@...sler.com>,
	Jesper Dangaard Brouer <hawk@...nel.org>,
	Ilias Apalodimas <ilias.apalodimas@...aro.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Arnd Bergmann <arnd@...db.de>, Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Andrii Nakryiko <andrii@...nel.org>,
	Martin KaFai Lau <martin.lau@...ux.dev>,
	Eduard Zingerman <eddyz87@...il.com>, Song Liu <song@...nel.org>,
	Yonghong Song <yonghong.song@...ux.dev>,
	John Fastabend <john.fastabend@...il.com>,
	KP Singh <kpsingh@...nel.org>, Stanislav Fomichev <sdf@...gle.com>,
	Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
	David Ahern <dsahern@...nel.org>,
	Willem de Bruijn <willemdebruijn.kernel@...il.com>,
	Shuah Khan <shuah@...nel.org>,
	Sumit Semwal <sumit.semwal@...aro.org>,
	Christian König <christian.koenig@....com>,
	Pavel Begunkov <asml.silence@...il.com>,
	Jason Gunthorpe <jgg@...pe.ca>,
	Yunsheng Lin <linyunsheng@...wei.com>,
	Shailend Chand <shailend@...gle.com>,
	Harshitha Ramamurthy <hramamurthy@...gle.com>,
	Jeroen de Borst <jeroendb@...gle.com>,
	Praveen Kaligineedi <pkaligineedi@...gle.com>
Subject: Re: [RFC PATCH net-next v6 02/15] net: page_pool: create hooks for
 custom page providers

On Fri, Mar 22, 2024 at 10:40:26AM -0700, Mina Almasry wrote:
> Hi Christoph,
> 
> Sorry for the late reply, I've been out for a few days.
> 
> On Mon, Mar 18, 2024 at 4:22 PM Christoph Hellwig <hch@...radead.org> wrote:
> >
> > On Sun, Mar 17, 2024 at 07:49:43PM -0700, David Wei wrote:
> > > I'm working on a similar proposal for zero copy Rx but to host memory
> > > and depend on this memory provider API.
> >
> > How do you need a different provider for that vs just udmabuf?
> >
> 
> This was discussed on the io_uring ZC RFC in one of the earliest RFCs.
> Here is a link to Pavel's response:
> 
> https://patchwork.kernel.org/project/netdevbpf/patch/20231106024413.2801438-6-almasrymina@google.com/#25589471

Undesirable is not a good argument.  We need one proper API that
different subsystems share for this use case (this is the same Feedback
I gave Keith for the similar block proposal btw, not picking on the net
folks here).

If dmabuf/udmabuf doesn't work for that we need to enhance or replace
it, but not come up with little subsystem specific side channels.