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Sun, 09 Jun 2024 18:07:02 -0700 (PDT) Message-ID: <54975459-7a5a-46ff-a9ae-dc16ceffbab4@gmail.com> Date: Mon, 10 Jun 2024 02:07:01 +0100 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH net-next v10 02/14] net: page_pool: create hooks for custom page providers To: David Wei , Jason Gunthorpe , David Ahern Cc: Mina Almasry , Christoph Hellwig , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-alpha@vger.kernel.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, sparclinux@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-arch@vger.kernel.org, bpf@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Donald Hunter , Jonathan Corbet , Richard Henderson , Ivan Kokshaysky , Matt Turner , Thomas Bogendoerfer , "James E.J. Bottomley" , Helge Deller , Andreas Larsson , Jesper Dangaard Brouer , Ilias Apalodimas , Steven Rostedt , Masami Hiramatsu , Mathieu Desnoyers , Arnd Bergmann , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Eduard Zingerman , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Steffen Klassert , Herbert Xu , Willem de Bruijn , Shuah Khan , Sumit Semwal , =?UTF-8?Q?Christian_K=C3=B6nig?= , Yunsheng Lin , Shailend Chand , Harshitha Ramamurthy , Shakeel Butt , Jeroen de Borst , Praveen Kaligineedi References: <20240530201616.1316526-1-almasrymina@google.com> <20240530201616.1316526-3-almasrymina@google.com> <5aee4bba-ca65-443c-bd78-e5599b814a13@gmail.com> <20240607145247.GG791043@ziepe.ca> <45803740-442c-4298-b47e-2d87ae5a6012@davidwei.uk> Content-Language: en-US From: Pavel Begunkov In-Reply-To: <45803740-442c-4298-b47e-2d87ae5a6012@davidwei.uk> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 6/10/24 01:37, David Wei wrote: > On 2024-06-07 17:52, Jason Gunthorpe wrote: >> IMHO it seems to compose poorly if you can only use the io_uring >> lifecycle model with io_uring registered memory, and not with DMABUF >> memory registered through Mina's mechanism. > > By this, do you mean io_uring must be exclusively used to use this > feature? > > And you'd rather see the two decoupled, so userspace can register w/ say > dmabuf then pass it to io_uring? Personally, I have no clue what Jason means. You can just as well say that it's poorly composable that write(2) to a disk cannot post a completion into a XDP ring, or a netlink socket, or io_uring's main completion queue, or name any other API. The devmem TCP callback can implement it in a way feasible to the project, but it cannot directly post events to an unrelated API like io_uring. And devmem attaches buffers to a socket, for which a ring for returning buffers might even be a nuisance. -- Pavel Begunkov