From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id AC55CC433EF for ; Mon, 24 Jan 2022 09:43:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234715AbiAXJne (ORCPT ); Mon, 24 Jan 2022 04:43:34 -0500 Received: from out30-132.freemail.mail.aliyun.com ([115.124.30.132]:45840 "EHLO out30-132.freemail.mail.aliyun.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229985AbiAXJnc (ORCPT ); Mon, 24 Jan 2022 04:43:32 -0500 X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R131e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=e01e04407;MF=haoxu@linux.alibaba.com;NM=1;PH=DS;RN=10;SR=0;TI=SMTPD_---0V2iRAxk_1643017400; Received: from hao-A29R.hz.ali.com(mailfrom:haoxu@linux.alibaba.com fp:SMTPD_---0V2iRAxk_1643017400) by smtp.aliyun-inc.com(127.0.0.1); Mon, 24 Jan 2022 17:43:29 +0800 From: Hao Xu To: netdev@vger.kernel.org, io-uring@vger.kernel.org Cc: Jens Axboe , Pavel Begunkov , Eric Dumazet , "David S . Miller" , Jakub Kicinski , Hideaki YOSHIFUJI , David Ahern , Joseph Qi Subject: [RFC 0/3] io_uring zerocopy receive Date: Mon, 24 Jan 2022 17:43:17 +0800 Message-Id: <20220124094320.900713-1-haoxu@linux.alibaba.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org Integrate the current zerocopy receive solution to io_uring for eazier use. The current calling process is: 1) mmap a range of virtual address 2) poll() to wait for data ready of the sockfd 3) call getsockopt() to map the address in 1) to physical pages 4) access the data. By integrating it to io_uring, 2) and 3) can be merged: 1) mmap a range of virtual address 2) prepare a sqe and submit 3) get a cqe which indicates data is ready and mapped 4) access the data which reduce one system call and make users be unaware of 3) Also provide a test case which basically reuses tools/testing/selftests/net/tcp_mmap.c: https://github.com/HowHsu/liburing/tree/zc_receive server side: taskset -c 1-2 ./zc_receive -s -4 -z -M $((4096+12)) client side: taskset -c 3 ./tcp_mmap -H '127.0.0.1' -z -4 -M $((4096+12)) no much difference of the result since no functionality change. Hao Xu (3): net-zerocopy: split zerocopy receive to several parts net-zerocopy: remove static for tcp_zerocopy_receive() io_uring: zerocopy receive fs/io_uring.c | 72 ++++++++++++++++++ include/net/tcp.h | 8 ++ include/uapi/linux/io_uring.h | 1 + net/ipv4/tcp.c | 134 ++++++++++++++++++++-------------- 4 files changed, 159 insertions(+), 56 deletions(-) -- 2.25.1