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=-3.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=no 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 B1BD2ECE58E for ; Sat, 12 Oct 2019 01:54:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8C2062084C for ; Sat, 12 Oct 2019 01:54:36 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="U1Z90jMN" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728059AbfJLByf (ORCPT ); Fri, 11 Oct 2019 21:54:35 -0400 Received: from mail-pf1-f194.google.com ([209.85.210.194]:41408 "EHLO mail-pf1-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726903AbfJLBye (ORCPT ); Fri, 11 Oct 2019 21:54:34 -0400 Received: by mail-pf1-f194.google.com with SMTP id q7so7079266pfh.8; Fri, 11 Oct 2019 18:54:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=XR2n34xXjC/7ocn7v74lqd3awYFNRTOmHAVF9A1J9OU=; b=U1Z90jMNlXgVvmjnXsQs15YRgwC9WJW/iX0G0SRcbHymiifo6JzpAQYHoXocJ6yv8t TKqjH2rU5JWMzPYgeDIWdtm5qt/7/xJ1KtCW+O1A9mjPG0R7nttRHX2fWG3aUyIS5vBM +FTNr4d0NzroXLjHENuu4NgU9bIz3ROH5xhkr2H2wpVot0ZaDpPdmQXLOKdvyo+mwt/T RDxJUHbabpnHeD1fjmadNUtQArLDunRG3S7vJ4Z9Z5JvRIdP457Ny8DgrpmqOPPNNCk1 rze9Hc1fZhJZ1U/RkD8Y83GAhkC+fE42IyhXkiOxcb/wA+fgtnJ+qW/osJ79Fz7B9WCM 41RQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=XR2n34xXjC/7ocn7v74lqd3awYFNRTOmHAVF9A1J9OU=; b=FKl7KuODxSmBFQYFhZd6XaF+1EiwyOxzm6QMwBtsuJ4FxDUBxG2tRvpsvwGEFTxQ1V W/blJ/IYQffLqMzVYb91X/OQ01lACm9+dYacNrc7F91D3mcVCM4Os8/bogBKpN3ezH/u UwNhivOaPZRL9UZSexgDkhuxIAD2ydWNgkYWUoJpNulDUEJRZcbiiNgoYwM+sH5x1+Ml 02Dx5dxEq2nKOk+nR5TubAiDqmJP4zvVHdD4Z8MHV5gl1RXm4fOjOXIl/s8G95nx/pbE dSU3DCFQQjcKge0Jk/Pn8XJ7ndWZe/1L/Vr0wpL7k7vG6KVT6hFXZnuKx+8gCQIk7YHV BTKQ== X-Gm-Message-State: APjAAAUIPqKyBx4TT4kiIxHrO50p2uoq2pZStQYvnIiP2O1br+lJs+P6 lOhGw/PGRCl3m5bU8FF5ROo= X-Google-Smtp-Source: APXvYqzGEv7ahV5HYDXwoKttYyR7AVek3+lc6pBmvHkkAjwJAxR1YRK6ZUHwVhBEaytbBLk75yk88Q== X-Received: by 2002:a62:2783:: with SMTP id n125mr1983129pfn.167.1570845274086; Fri, 11 Oct 2019 18:54:34 -0700 (PDT) Received: from localhost.localdomain (KD124211219252.ppp-bb.dion.ne.jp. [124.211.219.252]) by smtp.gmail.com with ESMTPSA id e127sm10992187pfe.37.2019.10.11.18.54.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 11 Oct 2019 18:54:33 -0700 (PDT) From: prashantbhole.linux@gmail.com To: "Michael S . Tsirkin" , Jason Wang , "David S . Miller" Cc: Prashant Bhole , David Ahern , kvm@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH net-next 0/3] vhost_net: access ptr ring using tap recvmsg Date: Sat, 12 Oct 2019 10:53:54 +0900 Message-Id: <20191012015357.1775-1-prashantbhole.linux@gmail.com> X-Mailer: git-send-email 2.21.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org From: Prashant Bhole vhost_net needs to peek tun packet sizes to allocate virtio buffers. Currently it directly accesses tap ptr ring to do it. Jason Wang suggested to achieve this using msghdr->msg_control and modifying the behavior of tap recvmsg. This change will be useful in future in case of virtio-net XDP offload. Where packets will be XDP processed in tap recvmsg and vhost will see only non XDP_DROP'ed packets. Patch 1: reorganizes the tun_msg_ctl so that it can be extended by the means of different commands. tap sendmsg recvmsg will behave according to commands. Patch 2: modifies recvmsg implementation to produce packet pointers. vhost_net uses recvmsg API instead of ptr_ring_consume(). Patch 3: removes ptr ring usage in vhost and functions those export ptr ring from tun/tap. Prashant Bhole (3): tuntap: reorganize tun_msg_ctl usage vhost_net: user tap recvmsg api to access ptr ring tuntap: remove usage of ptr ring in vhost_net drivers/net/tap.c | 44 ++++++++++++++--------- drivers/net/tun.c | 45 +++++++++++++++--------- drivers/vhost/net.c | 79 ++++++++++++++++++++++-------------------- include/linux/if_tun.h | 9 +++-- 4 files changed, 103 insertions(+), 74 deletions(-) -- 2.21.0