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=-16.4 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 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 56C30C43461 for ; Thu, 13 May 2021 12:19:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 23B3961358 for ; Thu, 13 May 2021 12:19:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233028AbhEMMU1 (ORCPT ); Thu, 13 May 2021 08:20:27 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:32728 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233866AbhEMMTx (ORCPT ); Thu, 13 May 2021 08:19:53 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1620908323; 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=IK5KASvNIAH9Eni0vYhJFRLrKtUI3CSzvduC524we5U=; b=Io0l+xS9CDQYBO0fe3bNCJ60Euj0LLrCzh1UrJ3rOYlDf9JTokrQ3fj072/IYi1H3PW1bN W6CW0t+sqUMt0wcUFiHqdQOtrVc7AZU35pGEzognsJfMiDonVICqEZF5uNJkcKH71ZwgQG GjWxNJ8eJUDozjRlLUkI8Xv6RnZgXYU= Received: from mail-ed1-f72.google.com (mail-ed1-f72.google.com [209.85.208.72]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-500-e9MWpuTSMqeMcfkUsdJ7nA-1; Thu, 13 May 2021 08:18:42 -0400 X-MC-Unique: e9MWpuTSMqeMcfkUsdJ7nA-1 Received: by mail-ed1-f72.google.com with SMTP id r19-20020a05640251d3b02903888eb31cafso14540285edd.13 for ; Thu, 13 May 2021 05:18:41 -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=IK5KASvNIAH9Eni0vYhJFRLrKtUI3CSzvduC524we5U=; b=EZVRxUHFM7EITb1KXir/62x7m+WSt8dSi8Lb4r/C/t6tsO5lUsLf4XjnLJcqNNez7f RzDZSurlyAg6GxyUYnkEL2LckfJOWAEQLlrWT2IIjhYKCho1G1ySl4ReinPALvlKtmll 4TFje9FMV46y9hkSEjKnM+gOsEIUYxHfJe64Iv08qZz22KcyWCgUlfVuLV/tgJp6MtUt KaljoIVOKA/rryKzMxrc6kcW9bOr1Uh5YkaDNUWfuBIgUFZaP+mKcTQFAJz1bG8bXzvV a5Xf2PwF1Z31AbgCAOgS600qycnAd8xykylxja5qc1SPnKS0K+3cZuXBKfiFkTJraMJI xXmw== X-Gm-Message-State: AOAM531/O82VrkrOimifvciBPPJj7Uy3MI0+qt52EvvpAh1p0jidexVE qAjcuRU115FW012xCjPJLTG4DiL0Msv/ek1a6c7q8erIUPtdRp7N8+kb7RUiIP7+eAe7o49apnJ uFqDbXKvVDKTPMcU8 X-Received: by 2002:a17:906:604a:: with SMTP id p10mr4996090ejj.148.1620908321010; Thu, 13 May 2021 05:18:41 -0700 (PDT) X-Google-Smtp-Source: ABdhPJz1Vg66JpJOxLpGs+6NIjUxFfgVCqpT78vMAZP1rCCIR2bhxg+eIcIxHZ+9opyz96knLH1DNA== X-Received: by 2002:a17:906:604a:: with SMTP id p10mr4996058ejj.148.1620908320779; Thu, 13 May 2021 05:18:40 -0700 (PDT) Received: from steredhat (host-79-18-148-79.retail.telecomitalia.it. [79.18.148.79]) by smtp.gmail.com with ESMTPSA id t14sm1697687ejc.121.2021.05.13.05.18.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 13 May 2021 05:18:40 -0700 (PDT) Date: Thu, 13 May 2021 14:18:38 +0200 From: Stefano Garzarella To: Arseny Krasnov Cc: Stefan Hajnoczi , "Michael S. Tsirkin" , Jason Wang , "David S. Miller" , Jakub Kicinski , Jorgen Hansen , Andra Paraschiv , Colin Ian King , Norbert Slusarek , kvm@vger.kernel.org, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, stsp2@yandex.ru, oxffffaa@gmail.com Subject: Re: [RFC PATCH v9 11/19] virtio/vsock: dequeue callback for SOCK_SEQPACKET Message-ID: <20210513121838.ndpgj56gwcww3pfc@steredhat> References: <20210508163027.3430238-1-arseny.krasnov@kaspersky.com> <20210508163523.3431999-1-arseny.krasnov@kaspersky.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Disposition: inline In-Reply-To: <20210508163523.3431999-1-arseny.krasnov@kaspersky.com> Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org On Sat, May 08, 2021 at 07:35:20PM +0300, Arseny Krasnov wrote: >This adds transport callback and it's logic for SEQPACKET dequeue. >Callback fetches RW packets from rx queue of socket until whole record >is copied(if user's buffer is full, user is not woken up). This is done >to not stall sender, because if we wake up user and it leaves syscall, >nobody will send credit update for rest of record, and sender will wait >for next enter of read syscall at receiver's side. So if user buffer is >full, we just send credit update and drop data. > >Signed-off-by: Arseny Krasnov >--- > v8 -> v9: > 1) Check for RW packet type is removed from loop(all packet now > considered RW). > 2) Locking in loop is fixed. > 3) cpu_to_le32()/le32_to_cpu() now used. > 4) MSG_TRUNC handling removed from transport. > > include/linux/virtio_vsock.h | 5 ++ > net/vmw_vsock/virtio_transport_common.c | 64 +++++++++++++++++++++++++ > 2 files changed, 69 insertions(+) > >diff --git a/include/linux/virtio_vsock.h b/include/linux/virtio_vsock.h >index dc636b727179..02acf6e9ae04 100644 >--- a/include/linux/virtio_vsock.h >+++ b/include/linux/virtio_vsock.h >@@ -80,6 +80,11 @@ virtio_transport_dgram_dequeue(struct vsock_sock *vsk, > struct msghdr *msg, > size_t len, int flags); > >+ssize_t >+virtio_transport_seqpacket_dequeue(struct vsock_sock *vsk, >+ struct msghdr *msg, >+ int flags, >+ bool *msg_ready); > s64 virtio_transport_stream_has_data(struct vsock_sock *vsk); > s64 virtio_transport_stream_has_space(struct vsock_sock *vsk); > >diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio_transport_common.c >index ad0d34d41444..f649a21dd23b 100644 >--- a/net/vmw_vsock/virtio_transport_common.c >+++ b/net/vmw_vsock/virtio_transport_common.c >@@ -393,6 +393,58 @@ virtio_transport_stream_do_dequeue(struct vsock_sock *vsk, > return err; > } > >+static int virtio_transport_seqpacket_do_dequeue(struct vsock_sock *vsk, >+ struct msghdr *msg, >+ int flags, >+ bool *msg_ready) >+{ >+ struct virtio_vsock_sock *vvs = vsk->trans; >+ struct virtio_vsock_pkt *pkt; >+ int err = 0; >+ size_t user_buf_len = msg->msg_iter.count; Forgot to mention that also here is better to use `msg_data_left(msg)` Thanks, Stefano