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=-8.5 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,URIBL_RED 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 21E8AC433C1 for ; Thu, 25 Mar 2021 10:53:14 +0000 (UTC) Received: from smtp4.osuosl.org (smtp4.osuosl.org [140.211.166.137]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 8D8CD61A27 for ; Thu, 25 Mar 2021 10:53:13 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 8D8CD61A27 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=virtualization-bounces@lists.linux-foundation.org Received: from localhost (localhost [127.0.0.1]) by smtp4.osuosl.org (Postfix) with ESMTP id 3874340ECE; Thu, 25 Mar 2021 10:53:13 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp4.osuosl.org ([127.0.0.1]) by localhost (smtp4.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id NTQsV5a12VTo; Thu, 25 Mar 2021 10:53:11 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by smtp4.osuosl.org (Postfix) with ESMTP id 5420540EA5; Thu, 25 Mar 2021 10:53:11 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id EF84AC000E; Thu, 25 Mar 2021 10:53:08 +0000 (UTC) Received: from smtp3.osuosl.org (smtp3.osuosl.org [140.211.166.136]) by lists.linuxfoundation.org (Postfix) with ESMTP id 03D0CC000A for ; Thu, 25 Mar 2021 10:53:08 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp3.osuosl.org (Postfix) with ESMTP id E615C60B1A for ; Thu, 25 Mar 2021 10:53:07 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Authentication-Results: smtp3.osuosl.org (amavisd-new); dkim=pass (1024-bit key) header.d=redhat.com Received: from smtp3.osuosl.org ([127.0.0.1]) by localhost (smtp3.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Gx2JOI6VPnnE for ; Thu, 25 Mar 2021 10:53:07 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.8.0 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [63.128.21.124]) by smtp3.osuosl.org (Postfix) with ESMTPS id 0354160727 for ; Thu, 25 Mar 2021 10:53:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1616669586; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=rA6ScZsKFbklJRAOSK9fbmhff8O1iylGdvkUdoNRPG8=; b=O0W61/RM/2c0we7RVtePUjh+6ZC61mZphZV0XN0XpXnXnOS92SHvz0Sy0ZvkHB0mDDzUvC KrGkjdrQ72mYYGZNXpm37vd51TFAn0AjTxeJV5l0BkINVTtGmDeQLQmCd/i0CTgStlmkEu LJOBzykjAk66txqWQLvxs7uz21JT3fA= Received: from mail-wm1-f69.google.com (mail-wm1-f69.google.com [209.85.128.69]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-448-YbcrVOMjNj6NWgLp3vTMPQ-1; Thu, 25 Mar 2021 06:53:04 -0400 X-MC-Unique: YbcrVOMjNj6NWgLp3vTMPQ-1 Received: by mail-wm1-f69.google.com with SMTP id a65so1100859wmh.1 for ; Thu, 25 Mar 2021 03:53:03 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=rA6ScZsKFbklJRAOSK9fbmhff8O1iylGdvkUdoNRPG8=; b=FUzlbcURRCZ4yzS3tDFhmwkV/nf/54KsELbeKTqHhYJ+4Y4nXxWHJxkXw4Bb91VI+n qPJc4M8FXXWg3+Tf6ooiMiXthUf8XH3a9FwJ1/RkbsRWzp9LYxugI+wh0fkcv/DP0Mr5 qPyiVpuTNLZqznbUc7cTcZEQm5XDC7lE9rFex9fyFD0aH8m01LydkIdRWyFhcJZkfqMg ehqsPmXvosKoGhpwFCl32wOiWRsKZXgEf3RqLy1OOr10hHpytph24MaM33um3jv3Qjp/ X7LsDwjveTkg9iauWKX0FQOeEtjdbSjr9zN7mpJoXfwsbw8caS/+6f0zBGi5VEGuxi1F oVGQ== X-Gm-Message-State: AOAM5329m+UQMcvqfFft4KbTF0x4+rGh/oE4iZlWfinwuKCdYRHBBe4B SXAjxc3bwyOBQV4wYIXGoOvHdOxcvqn3Clvo72EwIzPWAGRxm/jZVQFwxNh8Uy0LFnq2bdkw55e IueX8BY8KtX+t/bxg39PWiPSJS1QrIdRZpI83eWMA/g== X-Received: by 2002:a05:600c:198f:: with SMTP id t15mr7325687wmq.8.1616669582887; Thu, 25 Mar 2021 03:53:02 -0700 (PDT) X-Google-Smtp-Source: ABdhPJxPF/o7JivieTbfBmgFLVxa3jW4fWoo6PGZnk/wPYmH1nohRO66HgZd9zJ49OgEoAEvFWs5wA== X-Received: by 2002:a05:600c:198f:: with SMTP id t15mr7325659wmq.8.1616669582638; Thu, 25 Mar 2021 03:53:02 -0700 (PDT) Received: from steredhat (host-79-34-249-199.business.telecomitalia.it. [79.34.249.199]) by smtp.gmail.com with ESMTPSA id u63sm6101187wmg.24.2021.03.25.03.53.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 25 Mar 2021 03:53:02 -0700 (PDT) Date: Thu, 25 Mar 2021 11:52:59 +0100 From: Stefano Garzarella To: Arseny Krasnov Subject: Re: [RFC PATCH v7 00/22] virtio/vsock: introduce SOCK_SEQPACKET support Message-ID: <20210325105259.dujvq7honiwigfyg@steredhat> References: <20210323130716.2459195-1-arseny.krasnov@kaspersky.com> MIME-Version: 1.0 In-Reply-To: <20210323130716.2459195-1-arseny.krasnov@kaspersky.com> Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=sgarzare@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Disposition: inline Cc: Andra Paraschiv , kvm@vger.kernel.org, "Michael S. Tsirkin" , Jeff Vander Stoep , stsp2@yandex.ru, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, oxffffaa@gmail.com, netdev@vger.kernel.org, Norbert Slusarek , Stefan Hajnoczi , Colin Ian King , Jakub Kicinski , "David S. Miller" , Jorgen Hansen , Alexander Popov X-BeenThere: virtualization@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Linux virtualization List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Errors-To: virtualization-bounces@lists.linux-foundation.org Sender: "Virtualization" Hi Arseny, On Tue, Mar 23, 2021 at 04:07:13PM +0300, Arseny Krasnov wrote: > This patchset implements support of SOCK_SEQPACKET for virtio >transport. > As SOCK_SEQPACKET guarantees to save record boundaries, so to >do it, two new packet operations were added: first for start of record > and second to mark end of record(SEQ_BEGIN and SEQ_END later). Also, >both operations carries metadata - to maintain boundaries and payload >integrity. Metadata is introduced by adding special header with two >fields - message id and message length: > > struct virtio_vsock_seq_hdr { > __le32 msg_id; > __le32 msg_len; > } __attribute__((packed)); > > This header is transmitted as payload of SEQ_BEGIN and SEQ_END >packets(buffer of second virtio descriptor in chain) in the same way as >data transmitted in RW packets. Payload was chosen as buffer for this >header to avoid touching first virtio buffer which carries header of >packet, because someone could check that size of this buffer is equal >to size of packet header. To send record, packet with start marker is >sent first(it's header carries length of record and id),then all data >is sent as usual 'RW' packets and finally SEQ_END is sent(it carries >id of message, which is equal to id of SEQ_BEGIN), also after sending >SEQ_END id is incremented. On receiver's side,size of record is known >from packet with start record marker. To check that no packets were >dropped by transport, 'msg_id's of two sequential SEQ_BEGIN and SEQ_END >are checked to be equal and length of data between two markers is >compared to then length in SEQ_BEGIN header. > Now as packets of one socket are not reordered neither on >vsock nor on vhost transport layers, such markers allows to restore >original record on receiver's side. If user's buffer is smaller that >record length, when all out of size data is dropped. > Maximum length of datagram is not limited as in stream socket, >because same credit logic is used. Difference with stream socket is >that user is not woken up until whole record is received or error >occurred. Implementation also supports 'MSG_EOR' and 'MSG_TRUNC' flags. > Tests also implemented. > > Thanks to stsp2@yandex.ru for encouragements and initial design >recommendations. > > Arseny Krasnov (22): > af_vsock: update functions for connectible socket > af_vsock: separate wait data loop > af_vsock: separate receive data loop > af_vsock: implement SEQPACKET receive loop > af_vsock: separate wait space loop > af_vsock: implement send logic for SEQPACKET > af_vsock: rest of SEQPACKET support > af_vsock: update comments for stream sockets > virtio/vsock: set packet's type in virtio_transport_send_pkt_info() > virtio/vsock: simplify credit update function API > virtio/vsock: dequeue callback for SOCK_SEQPACKET > virtio/vsock: fetch length for SEQPACKET record > virtio/vsock: add SEQPACKET receive logic > virtio/vsock: rest of SOCK_SEQPACKET support > virtio/vsock: SEQPACKET support feature bit > virtio/vsock: setup SEQPACKET ops for transport > vhost/vsock: setup SEQPACKET ops for transport > vsock/loopback: setup SEQPACKET ops for transport > vhost/vsock: SEQPACKET feature bit support > virtio/vsock: SEQPACKET feature bit support > vsock_test: add SOCK_SEQPACKET tests > virtio/vsock: update trace event for SEQPACKET > > drivers/vhost/vsock.c | 21 +- > include/linux/virtio_vsock.h | 21 + > include/net/af_vsock.h | 9 + > .../events/vsock_virtio_transport_common.h | 48 +- > include/uapi/linux/virtio_vsock.h | 19 + > net/vmw_vsock/af_vsock.c | 581 +++++++++++------ > net/vmw_vsock/virtio_transport.c | 17 + > net/vmw_vsock/virtio_transport_common.c | 379 +++++++++-- > net/vmw_vsock/vsock_loopback.c | 12 + > tools/testing/vsock/util.c | 32 +- > tools/testing/vsock/util.h | 3 + > tools/testing/vsock/vsock_test.c | 126 ++++ > 12 files changed, 1015 insertions(+), 253 deletions(-) > > v6 -> v7: > General changelog: > - virtio transport callback for message length now removed > from transport. Length of record is returned by dequeue > callback. > > - function which tries to get message length now returns 0 > when rx queue is empty. Also length of current message in > progress is set to 0, when message processed or error > happens. > > - patches for virtio feature bit moved after patches with > transport ops. > > Per patch changelog: > see every patch after '---' line. I reviewed the series and I left some comments, I think we are at a good point, but we should have the specification accepted before merging this series to avoid having to change the implementation later. What do you think? Thanks, Stefano _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization