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 X-Spam-Level: X-Spam-Status: No, score=-13.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 42541C2BBD4 for ; Mon, 7 Dec 2020 22:17:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1697E239E5 for ; Mon, 7 Dec 2020 22:17:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727860AbgLGWQt (ORCPT ); Mon, 7 Dec 2020 17:16:49 -0500 Received: from userp2130.oracle.com ([156.151.31.86]:38478 "EHLO userp2130.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727704AbgLGWQs (ORCPT ); Mon, 7 Dec 2020 17:16:48 -0500 Received: from pps.filterd (userp2130.oracle.com [127.0.0.1]) by userp2130.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 0B7MB5vC133145; Mon, 7 Dec 2020 22:16:05 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : subject : date : message-id; s=corp-2020-01-29; bh=gSK0USgX8yoVRle2byyzlf7k21P01ChDqSUrdTPAv30=; b=K1zMMDXQnDvK2C5hNa+XbR/wL+5G96iNz9uus6CvZZMPx9ijL6OPYn7b0cjiWz27l+Vn xiJNPYfp/MaVbS/neEsOZho8MEYlZRvO/p3ld9dhjsB54RAoxeqLqgO1nzJYV7DeAH4Z 4WNFJsSbmHleOzfjiiyvNcF8Q0AMKDwyQVsMQQMi/38MbM0LNsD2jdFDf3l1KTcwYJPj RHSKNXYOgF9UMsGxPC85UThIp+RfWRHlo5qAzu6Vp3mgYXb5RSQLNzxZCuzcpGka1+5L k6of2vkRn7KTZpMcb0zLWvDxhf1x3rMh8QFKRlMPYORGuzlk7YiHgDXJefZtpBjGFSlk /w== Received: from userp3020.oracle.com (userp3020.oracle.com [156.151.31.79]) by userp2130.oracle.com with ESMTP id 3581mqqv5q-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Mon, 07 Dec 2020 22:16:05 +0000 Received: from pps.filterd (userp3020.oracle.com [127.0.0.1]) by userp3020.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 0B7MAbsg049065; Mon, 7 Dec 2020 22:16:04 GMT Received: from userv0122.oracle.com (userv0122.oracle.com [156.151.31.75]) by userp3020.oracle.com with ESMTP id 358kyrxk0e-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 07 Dec 2020 22:16:04 +0000 Received: from abhmp0017.oracle.com (abhmp0017.oracle.com [141.146.116.23]) by userv0122.oracle.com (8.14.4/8.14.4) with ESMTP id 0B7MG3R8006684; Mon, 7 Dec 2020 22:16:04 GMT Received: from ca-ldom147.us.oracle.com (/10.129.68.131) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Mon, 07 Dec 2020 14:16:03 -0800 From: Bijan Mottahedeh To: axboe@kernel.dk, asml.silence@gmail.com, io-uring@vger.kernel.org Subject: [PATCH v2 00/13] io_uring: buffer registration enhancements Date: Mon, 7 Dec 2020 14:15:39 -0800 Message-Id: <1607379352-68109-1-git-send-email-bijan.mottahedeh@oracle.com> X-Mailer: git-send-email 1.8.3.1 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9828 signatures=668682 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 adultscore=0 spamscore=0 mlxscore=0 malwarescore=0 suspectscore=0 mlxlogscore=796 bulkscore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2012070145 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9828 signatures=668682 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 mlxlogscore=805 clxscore=1015 malwarescore=0 priorityscore=1501 adultscore=0 lowpriorityscore=0 phishscore=0 spamscore=0 impostorscore=0 mlxscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2012070145 Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org v2: - drop readv/writev with fixed buffers patch - handle ref_nodes both both files/buffers with a single ref_list - make file/buffer handling more unified This patchset implements a set of enhancements to buffer registration consistent with existing file registration functionality: - buffer registration updates IORING_REGISTER_BUFFERS_UPDATE IORING_OP_BUFFERS_UPDATE - buffer registration sharing IORING_SETUP_SHARE_BUF IORING_SETUP_ATTACH_BUF I have kept the original patchset unchanged for the most part to facilitate reviewing and so this set adds a number of additional patches mostly making file/buffer handling more unified. Patch 1-2 modularize existing buffer registration code. Patch 3-7 generalize fixed_file functionality to fixed_rsrc. Patch 8 applies fixed_rsrc functionality for fixed buffers support. Patch 9-10 generalize files_update functionality to rsrc_update. Patch 11 implements buffer registration update, and introduces IORING_REGISTER_BUFFERS_UPDATE and IORING_OP_BUFFERS_UPDATE, consistent with file registration update. Patch 12 generalizes fixed resource allocation Patch 13 implements buffer sharing among multiple rings; it works as follows: - A new ring, A, is setup. Since no buffers have been registered, the registered buffer state is an empty set, Z. That's different from the NULL state in current implementation. - Ring B is setup, attaching to Ring A. It's also attaching to it's buffer registrations, now we have two references to the same empty set, Z. - Ring A registers buffers into set Z, which is no longer empty. - Ring B sees this immediately, since it's already sharing that set. Testing I have used liburing file-{register,update} tests as models for buffer-{register,update,share}, tests and they run ok. TBD - Haven't addressed Pavel's comment yet on using a single opcode for files/buffers update, pending Jen's opinion. Could we encode the resource type into the sqe (e.g. rw_flags)? Bijan Mottahedeh (13): io_uring: modularize io_sqe_buffer_register io_uring: modularize io_sqe_buffers_register io_uring: generalize fixed file functionality io_uring: rename fixed_file variables to fixed_rsrc io_uring: separate ref_list from fixed_rsrc_data io_uring: generalize fixed_file_ref_node functionality io_uring: add rsrc_ref locking routines io_uring: implement fixed buffers registration similar to fixed files io_uring: create common fixed_rsrc_ref_node handling routines io_uring: generalize files_update functionlity to rsrc_update io_uring: support buffer registration updates io_uring: create common fixed_rsrc_data allocation routines. io_uring: support buffer registration sharing fs/io_uring.c | 1004 +++++++++++++++++++++++++++++------------ include/uapi/linux/io_uring.h | 12 +- 2 files changed, 732 insertions(+), 284 deletions(-) -- 1.8.3.1