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=-2.4 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 B676AC4BA0B for ; Wed, 26 Feb 2020 03:53:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7900021927 for ; Wed, 26 Feb 2020 03:53:08 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="OwRhC2y9" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726187AbgBZDxH (ORCPT ); Tue, 25 Feb 2020 22:53:07 -0500 Received: from us-smtp-2.mimecast.com ([207.211.31.81]:50726 "EHLO us-smtp-delivery-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726024AbgBZDxH (ORCPT ); Tue, 25 Feb 2020 22:53:07 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1582689186; 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: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=pX9Cylpbp8u1yluJWyAC4cbOt92DeRnpwyxkzw7eOqc=; b=OwRhC2y9ZAou0MNvnzqZgvneuVghQJqkgMdzyi02S4/spbnWec3lxllaeJEf504kATPVji PbfTzST6sqtgflmXcqLeVYcBeM7pdwprsUsfv3njK2qxN670vCT5cc67WoIbnJUnoFP8Z5 hOPzOSNaatYFZk4YHPDf1gVsfB1qzz4= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-157-A9Sgg-C7PoOXr4WH258aQg-1; Tue, 25 Feb 2020 22:53:02 -0500 X-MC-Unique: A9Sgg-C7PoOXr4WH258aQg-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id B52531882CD1; Wed, 26 Feb 2020 03:53:00 +0000 (UTC) Received: from [10.72.13.217] (ovpn-13-217.pek2.redhat.com [10.72.13.217]) by smtp.corp.redhat.com (Postfix) with ESMTP id 7EE6692966; Wed, 26 Feb 2020 03:52:45 +0000 (UTC) Subject: Re: [PATCH RFC net-next] virtio_net: Relax queue requirement for using XDP To: David Ahern , David Ahern , netdev@vger.kernel.org Cc: davem@davemloft.net, kuba@kernel.org, "Michael S . Tsirkin" References: <20200226005744.1623-1-dsahern@kernel.org> <23fe48b6-71d1-55a3-e0e8-ca4b3fac1f7f@redhat.com> <9a5391fb-1d80-43d1-5e88-902738cc2528@gmail.com> <772b6d6f-0728-c338-b541-fcf4114a1d32@redhat.com> <3ab884ab-f7f8-18eb-3d18-c7636c84f9b4@digitalocean.com> From: Jason Wang Message-ID: Date: Wed, 26 Feb 2020 11:52:36 +0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <3ab884ab-f7f8-18eb-3d18-c7636c84f9b4@digitalocean.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 Content-Transfer-Encoding: quoted-printable Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org On 2020/2/26 =E4=B8=8A=E5=8D=8811:34, David Ahern wrote: > On 2/25/20 8:29 PM, Jason Wang wrote: >> TAP uses spinlock for XDP_TX. > code reference? I can not find that. > In tun_xdp_xmit(), ptr_ring is synchronized through producer_lock. Thanks