From patchwork Tue Aug 10 11:38:58 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arseny Krasnov X-Patchwork-Id: 12428695 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=-19.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 B5CDCC432BE for ; Tue, 10 Aug 2021 11:39:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9B3AB61051 for ; Tue, 10 Aug 2021 11:39:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240159AbhHJLjj (ORCPT ); Tue, 10 Aug 2021 07:39:39 -0400 Received: from mx13.kaspersky-labs.com ([91.103.66.164]:11522 "EHLO mx13.kaspersky-labs.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240148AbhHJLji (ORCPT ); Tue, 10 Aug 2021 07:39:38 -0400 Received: from relay13.kaspersky-labs.com (unknown [127.0.0.10]) by relay13.kaspersky-labs.com (Postfix) with ESMTP id 176DB520FC9; Tue, 10 Aug 2021 14:39:10 +0300 (MSK) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kaspersky.com; s=mail202102; t=1628595550; bh=fcTuEZHg+IIEcNiez+mECaMj+YtI21GiDfchP2O/dNk=; h=From:To:Subject:Date:Message-ID:MIME-Version:Content-Type; b=2PkSX1WF1/qolv0L35H/CzoRiB/0tIZcHx8YGoeBnhv/24IqQ86XUCm9cWP0RAPMj 6CMU5cqWIUmgxN8UwOesHc8ClS/KUtN4aMpAuVG3fpP3jtqyvkZbSzKIsj7WtI8yPp 2qCM64fXCMGuUgNAqpB8qnNuGTgEVMHS7eHwxKVMrZkkfsLM3IRcauensR5gSf/6jh 6dA9HMR2c+ialQv+98XKXOrMxi5SYDXTU2G2if+WlAheqk7jePOUm8A4GKBHuzMh5n cyeSa/2L1sOogjwqeWMzMvqiyMFWRmD08TnXGybzKFvQ20X8QuQILr/cf0SR+cmwg8 Vqft+uFmLXkFQ== Received: from mail-hq2.kaspersky.com (unknown [91.103.66.206]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (Client CN "mail-hq2.kaspersky.com", Issuer "Kaspersky MailRelays CA G3" (verified OK)) by mailhub13.kaspersky-labs.com (Postfix) with ESMTPS id 52576520FD6; Tue, 10 Aug 2021 14:39:09 +0300 (MSK) Received: from arseniy-pc.avp.ru (10.64.64.121) by hqmailmbx3.avp.ru (10.64.67.243) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2308.14; Tue, 10 Aug 2021 14:39:08 +0300 From: Arseny Krasnov To: Stefan Hajnoczi , Stefano Garzarella , "Michael S. Tsirkin" , Jason Wang , "David S. Miller" , Jakub Kicinski , Arseny Krasnov , Norbert Slusarek , Colin Ian King , Andra Paraschiv CC: , , , , , Subject: [RFC PATCH v2 0/5] virtio/vsock: introduce MSG_EOR flag for SEQPACKET Date: Tue, 10 Aug 2021 14:38:58 +0300 Message-ID: <20210810113901.1214116-1-arseny.krasnov@kaspersky.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-Originating-IP: [10.64.64.121] X-ClientProxiedBy: hqmailmbx3.avp.ru (10.64.67.243) To hqmailmbx3.avp.ru (10.64.67.243) X-KSE-ServerInfo: hqmailmbx3.avp.ru, 9 X-KSE-AntiSpam-Interceptor-Info: scan successful X-KSE-AntiSpam-Version: 5.9.20, Database issued on: 08/10/2021 11:22:08 X-KSE-AntiSpam-Status: KAS_STATUS_NOT_DETECTED X-KSE-AntiSpam-Method: none X-KSE-AntiSpam-Rate: 0 X-KSE-AntiSpam-Info: Lua profiles 165493 [Aug 10 2021] X-KSE-AntiSpam-Info: Version: 5.9.20.0 X-KSE-AntiSpam-Info: Envelope from: arseny.krasnov@kaspersky.com X-KSE-AntiSpam-Info: LuaCore: 454 454 39c6e442fd417993330528e7f9d13ac1bf7fdf8c X-KSE-AntiSpam-Info: {Tracking_from_domain_doesnt_match_to} X-KSE-AntiSpam-Info: kaspersky.com:7.1.1;d41d8cd98f00b204e9800998ecf8427e.com:7.1.1;arseniy-pc.avp.ru:7.1.1;127.0.0.199:7.1.2 X-KSE-AntiSpam-Info: Rate: 0 X-KSE-AntiSpam-Info: Status: not_detected X-KSE-AntiSpam-Info: Method: none X-KSE-Antiphishing-Info: Clean X-KSE-Antiphishing-ScanningType: Deterministic X-KSE-Antiphishing-Method: None X-KSE-Antiphishing-Bases: 08/10/2021 11:24:00 X-KSE-AttachmentFiltering-Interceptor-Info: no applicable attachment filtering rules found X-KSE-Antivirus-Interceptor-Info: scan successful X-KSE-Antivirus-Info: Clean, bases: 10.08.2021 6:55:00 X-KSE-BulkMessagesFiltering-Scan-Result: InTheLimit X-KSE-AttachmentFiltering-Interceptor-Info: no applicable attachment filtering rules found X-KSE-BulkMessagesFiltering-Scan-Result: InTheLimit X-KLMS-Rule-ID: 52 X-KLMS-Message-Action: clean X-KLMS-AntiSpam-Status: not scanned, disabled by settings X-KLMS-AntiSpam-Interceptor-Info: not scanned X-KLMS-AntiPhishing: Clean, bases: 2021/08/10 08:09:00 X-KLMS-AntiVirus: Kaspersky Security for Linux Mail Server, version 8.0.3.30, bases: 2021/08/10 05:40:00 #17007547 X-KLMS-AntiVirus-Status: Clean, skipped Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org This patchset implements support of MSG_EOR bit for SEQPACKET AF_VSOCK sockets over virtio transport. First we need to define 'messages' and 'records' like this: Message is result of sending calls: 'write()', 'send()', 'sendmsg()' etc. It has fixed maximum length, and it bounds are visible using return from receive calls: 'read()', 'recv()', 'recvmsg()' etc. Current implementation based on message definition above. Record has unlimited length, it consists of multiple messages, and bounds of record are visible via MSG_EOR flag returned from 'recvmsg()' call. Sender passes MSG_EOR to sending system call and receiver will see MSG_EOR when corresponding message will be processed. Idea of patchset comes from POSIX: it says that SEQPACKET supports record boundaries which are visible for receiver using MSG_EOR bit. So, it looks like MSG_EOR is enough thing for SEQPACKET and we don't need to maintain boundaries of corresponding send - receive system calls. But, for 'sendXXX()' and 'recXXX()' POSIX says, that all these calls operates with messages, e.g. 'sendXXX()' sends message, while 'recXXX()' reads messages and for SEQPACKET, 'recXXX()' must read one entire message from socket, dropping all out of size bytes. Thus, both message boundaries and MSG_EOR bit must be supported to follow POSIX rules. To support MSG_EOR new bit was added along with existing 'VIRTIO_VSOCK_SEQ_EOR': 'VIRTIO_VSOCK_SEQ_EOM'(end-of-message) - now it works in the same way as 'VIRTIO_VSOCK_SEQ_EOR'. But 'VIRTIO_VSOCK_SEQ_EOR' is used to mark 'MSG_EOR' bit passed from userspace. This patchset includes simple test for MSG_EOR. Arseny Krasnov(5): virtio/vsock: add 'VIRTIO_VSOCK_SEQ_EOM' bit vhost/vsock: support MSG_EOR bit processing virito/vsock: support MSG_EOR bit processing af_vsock: rename variables in receive loop vsock_test: update message bounds test for MSG_EOR drivers/vhost/vsock.c | 22 +++++++++++++--------- include/uapi/linux/virtio_vsock.h | 3 ++- net/vmw_vsock/af_vsock.c | 10 +++++----- net/vmw_vsock/virtio_transport_common.c | 23 +++++++++++++++-------- tools/testing/vsock/vsock_test.c | 8 +++++++- 5 files changed, 42 insertions(+), 24 deletions(-) v1 -> v2: - 'VIRTIO_VSOCK_SEQ_EOR' is renamed to 'VIRTIO_VSOCK_SEQ_EOM', to support backward compatibility. - use bitmask of flags to restore in vhost.c, instead of separated bool variable for each flag. - test for EAGAIN removed, as logically it is not part of this patchset(will be sent separately). - cover letter updated(added part with POSIX description). Signed-off-by: Arseny Krasnov