From: Jens Axboe <axboe@kernel.dk>
To: Christoph Hellwig <hch@infradead.org>, demiobenour@gmail.com
Cc: "Herbert Xu" <herbert@gondor.apana.org.au>,
"David S. Miller" <davem@davemloft.net>,
"Eric Dumazet" <edumazet@google.com>,
"Kuniyuki Iwashima" <kuniyu@google.com>,
"Paolo Abeni" <pabeni@redhat.com>,
"Willem de Bruijn" <willemb@google.com>,
"Jakub Kicinski" <kuba@kernel.org>,
"Simon Horman" <horms@kernel.org>,
"Peter Zijlstra" <peterz@infradead.org>,
"Ingo Molnar" <mingo@redhat.com>,
"Arnaldo Carvalho de Melo" <acme@kernel.org>,
"Namhyung Kim" <namhyung@kernel.org>,
"Mark Rutland" <mark.rutland@arm.com>,
"Alexander Shishkin" <alexander.shishkin@linux.intel.com>,
"Jiri Olsa" <jolsa@kernel.org>, "Ian Rogers" <irogers@google.com>,
"Adrian Hunter" <adrian.hunter@intel.com>,
"James Clark" <james.clark@linaro.org>,
"Jonathan Corbet" <corbet@lwn.net>,
"Shuah Khan" <skhan@linuxfoundation.org>,
"Eric Biggers" <ebiggers@google.com>,
"Ard Biesheuvel" <ardb@kernel.org>,
linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org,
io-uring@vger.kernel.org, netdev@vger.kernel.org,
linux-perf-users@vger.kernel.org, linux-doc@vger.kernel.org,
"Toke Høiland-Jørgensen" <toke@toke.dk>,
linux-api@vger.kernel.org
Subject: Re: [PATCH 1/3] net: Remove support for AIO on sockets
Date: Tue, 26 May 2026 09:58:27 -0600 [thread overview]
Message-ID: <92db3ff0-8f0b-4b61-a167-5004ffcf9025@kernel.dk> (raw)
In-Reply-To: <ahQCZQNoyO8GQt3H@infradead.org>
On 5/25/26 2:03 AM, Christoph Hellwig wrote:
> On Sat, May 23, 2026 at 03:43:02PM -0400, Demi Marie Obenour via B4 Relay wrote:
>> From: Demi Marie Obenour <demiobenour@gmail.com>
>>
>> The only user of msg->msg_iocb was AF_ALG, but that's deprecated.
>> It can be removed entirely at the cost of only supporting synchronous
>> operations. This doesn't break userspace, which will silently block
>> (for a bounded amount of time) in io_submit instead of operating
>> asynchronously.
>>
>> This also makes struct msghdr smaller, helping every other caller of
>> sendmsg().
>
> So we just had a discussion at LLC about how networking needs to support
> AIO better for zero copy.
>
> The current TCP zerocopy implementation provides completion notification
> through the socket error code, which is freaking weird and doesn't
> integrate well with either io_uring or in-kernel callers.
We already have that via io_uring, and without needing msg_kiocb or the
(very) weird socket error code retrieving.
--
Jens Axboe
next prev parent reply other threads:[~2026-05-26 15:58 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-05-23 19:43 [PATCH 0/3] AF_ALG: Remove support for AIO and old-style drivers Demi Marie Obenour via B4 Relay
2026-05-23 19:43 ` [PATCH 1/3] net: Remove support for AIO on sockets Demi Marie Obenour via B4 Relay
2026-05-25 8:03 ` Christoph Hellwig
2026-05-26 15:58 ` Jens Axboe [this message]
2026-05-27 8:13 ` Christoph Hellwig
2026-05-27 1:40 ` Jakub Kicinski
2026-05-23 19:43 ` [PATCH 2/3] AF_ALG: Drop support for off-CPU cryptography Demi Marie Obenour via B4 Relay
2026-05-23 19:43 ` [PATCH 3/3] AF_ALG: Document that it is *always* slower Demi Marie Obenour via B4 Relay
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