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=-2.1 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_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 CD3E9C35249 for ; Wed, 5 Feb 2020 09:19:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 98DA821741 for ; Wed, 5 Feb 2020 09:19:30 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="rZdRbaJ7" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728173AbgBEJT3 (ORCPT ); Wed, 5 Feb 2020 04:19:29 -0500 Received: from mail-pj1-f65.google.com ([209.85.216.65]:39272 "EHLO mail-pj1-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728034AbgBEJT2 (ORCPT ); Wed, 5 Feb 2020 04:19:28 -0500 Received: by mail-pj1-f65.google.com with SMTP id e9so729480pjr.4; Wed, 05 Feb 2020 01:19:28 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:cc:references:from:autocrypt:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=wKml5djSVHQcmNXNztVosBS8cCxU3q15aBmfCqyr090=; b=rZdRbaJ7Czt5T22V2HaWsif2Ka26eaY3Z9GG3ccBwzAxA+FUtXbqzMO47XGPKPFAbt Iva/pKq/Rbaq4mXgMAXg+6SBzCtX+e6yTCuuJixco+ojdq7FDCiR+WyQHtF3GkCCSMAe faviYmhEr66/W8aKOa93Wvfa4wTKRzoqGx59GyB83CdoNT9Se2vWQc/iZq5dOutEUlCc n82TWnpTBB/O4JZvRCPw27vFZG0z92YwqNrOdnto+LvvHOkuJYeuU7dHS1pj1NbIJTPr SL2m2cHJZBr2Ko9xkHoqU6Cp4mV4EuBZwfgm5e8GQGdPvoEhGIWiIAupH2IIplLPuN7z zCVQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:autocrypt :message-id:date:user-agent:mime-version:in-reply-to :content-language:content-transfer-encoding; bh=wKml5djSVHQcmNXNztVosBS8cCxU3q15aBmfCqyr090=; b=rWmKP9i7bmh39ZAezeElTDfJ1cgIZfqeDbCRghjzeP3ZxLo/num6RcNTJiM0OkolE8 feWtxjh3GTnzqt/KsWNv7XK90vrYi4/vadzRn6ScVC07vCFr46baXM7o0qR9c9g/okxt mmxGTYxfF+wXJkudAR+V8VFG9RwyhU+ioVV/2dL/Uz9GbfeFZY2GeznbkBrqdtNy3Ef6 8SKUiXCa5vimB/Qmtxl2BEFNhT696TrFnUL78PSEjN0n5oBkbJ3JXrCYjsGUQFkvdMj3 AV+rNukYdcrreGOuFmFgWcpa5q7lmw/LwhqnekzAj4ND4yTJgEHF6vFhsfwvhab65G6y aYEw== X-Gm-Message-State: APjAAAVDXdCE4Nlf9/XII7NIAH2bNC6C4db3giyekVOTawxXXU9uztty 1Pcj1tiETf0Om24TeDkjH5A7AN8QB/Fiaw== X-Google-Smtp-Source: APXvYqyMQnco7HBn74QT87oektAi3nGlKI5OQE2tSHNwbCsvMd72tiGtmtqNwr3iUaPFie6a7QdBAQ== X-Received: by 2002:a17:90a:2808:: with SMTP id e8mr4494736pjd.63.1580894367536; Wed, 05 Feb 2020 01:19:27 -0800 (PST) Received: from [192.168.100.27] ([103.202.217.14]) by smtp.gmail.com with ESMTPSA id b1sm28340059pfg.182.2020.02.05.01.19.23 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 05 Feb 2020 01:19:27 -0800 (PST) Subject: Re: [PATCH bpf-next v4] virtio_net: add XDP meta data support To: "Michael S. Tsirkin" Cc: jasowang@redhat.com, ast@kernel.org, daniel@iogearbox.net, davem@davemloft.net, hawk@kernel.org, john.fastabend@gmail.com, kafai@fb.com, songliubraving@fb.com, yhs@fb.com, kuba@kernel.org, andriin@fb.com, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, bpf@vger.kernel.org References: <8da1b560-3128-b885-b453-13de5c7431fb@redhat.com> <20200204071655.94474-1-yuya.kusakabe@gmail.com> <20200205003236-mutt-send-email-mst@kernel.org> From: Yuya Kusakabe Autocrypt: addr=yuya.kusakabe@gmail.com; keydata= mQINBFjtjhwBEADZqewy3PViD7ZRYVsmTvRqgw97NHWqcnNh/B0QMtn75R55aRDZG8BH9YtG OMGKmN70ZzVKm4yQ8+sBw9HC7n5pp+kftLAcfqDKwzsQpp/gKP3pfLDO2fkw/JRhUL+aaKTm ZQiMKv/XpfNsreAGQ+qvYVFmpMHCGlkQ6krY8yXhnwNm+Ne+42Bd1EYMT1PpQkPgwEDHVJqD JSymfmpMIzLYxtDxu4zXBOqj5eiDqaSmxKBrFveA8YcPARuNwMGB2ZbFIv7hZOVfMp4Skl9H aC2k4oCx3bJR/+IAy2pbJPXZtjFt9N8TLOZIJb4/wk83QVunaUaZYRkEJp4ZCDt3qzrAMqsb vPgg33/8ZicEKnuwAmTGnXuvrIBvvJfjeGG0dMheZY9aiJl5cdIBn8Xp6+rhogGuUc9C3AKI wMmYm3M8MkAgB/ghRAVbn/14nJjegHbN9bB2opwpd97piAj79RzKs0+g/xDLWcshSG4xL2U1 sYc58vPVXnSvJaOFUYe3kq4RCO/Rt3ilK8IXX8i8dFt0Z04mPEAxYA7T1Xa6/rMdrcnyUdiw 6NfWMlFJ8Dulq1eKt8rymRZaWlMT6ZiO0yWhp6HQwmpdyaB+XAQZ7P/05+mvXoO4SwDDoZJv DlpO9lbbLLLiPkIKXgKLwUUACcblviHEX1nqmnAr+0CZ9q/MTQARAQABtCdZdXlhIEt1c2Fr YWJlIDx5dXlhLmt1c2FrYWJlQGdtYWlsLmNvbT6JAlQEEwEIAD4CGwMFCwkIBwMFFQoJCAsF FgIDAQACHgECF4AWIQTaB7usAfxNKMeqa6Yq19F1Kl0bTQUCXNOYhQUJCzi/aQAKCRAq19F1 Kl0bTSxyD/9ocPShBVCwNH+Uwg0jlcKsqk7p13cr74cL7YxeyLjS82BKiDbfADm+zA//nOdP +pW9dUw7D9sv50cJQVlhw11nwE4FnvkTNJQo5A0ircJMQkViQgVP46VoHMxSQG+f9O3J8RTT sfgkGf4fqf6e49W/+yLFlJFInNjTdyC+fIngOZW9T+/9tgwgciS7VIOZj0rzfi62TU1brACn ABmXZletM0E11iDTVAm8VA3eemgVHIANa+doOh0VI2HjeuVOLom30pD6avJhjKsmawgj97Aj E7vf1WfFO/GVMV5CrJo8wdeGFVdgyC8KSEbLNkwMcE2QiipC6/XjtvZo6gD2bXZYoCEtiPkC EAVYOMh1CZlbPJsKExXfp+i3U4TGE8ag5bpC5FTw8oXkwqjz3KJaIkpcoxbFk520dMoeiDEp N6W1nueJUMrlIjqe4LnkDGwA+1HQN+osX2jCtE5xB3o9MefY1hDXDZqXAjOXfLV1O8AIhfR5 NjPJds29slln8psEFRwll/gB8SWDBJPBUur5Wz19d64s6cC0FTeuSZvnhDsVERSd1yYyOnin QmwCrD3LtHLS80LyDKsK0acCfEVBuQBE6qs9yVEV+59iDEKV7vMkrz5S9xwtvpAkoRA7lnIR z5BW9vLoaTR9JYdDtWq5+AXbNfqePqITt3DrGfJYrtPxM7kCDQRY7Y4cARAA2bDVoMFOiKHO J1YfeGcc2gVVXwJcfuhLGdOhLe9OcasUUw85Fvkz/nRgx5P3Cm39RuvlEIL8xfI4GfKEijtv qnzYlN+ZlZoi3ZHetAYs8509On1Lq7FcyiSJbPAgAmcEX0kD7JERR0UoMRGw465ZIK7CKww0 6QCzNcz6ZT2lQqcSgMp8ILopGr9KZxgzAIlU1P1EkqF8U8q4hlEOGghe66wFU1ByGYfaJV+/ qqj2nReKXcbbcsDzhbRrBVUoJfYieBd0eSF+oeHCPuLuhCyeIiQhElwue7jaeQrVBiQTlpg7 03gysP0Q40D5uR3arpwnU3csZ7tBN1INGTIGGnfw/jfqvxe45n13rHnrcovPF0H4D/sHT4Cy 1Ih4XdzXVGeyjqAIPZoJQ3XpM7hEztMU4RCzAfIvcI1PHd6p/LqJi9IZl25wXD4UsfELmd4L R4+QDJp2g2EP6wOUdjsNJkibelwdmQnc+II6iYxakwHt/JF0A777NGTiGaO8axeIO7cq9Afa R/JocpbnICFNM8BRC36AMjqey6cc9JjXtBTufrTJ7wd+TyjeboeOdhv67kZFrUrE8MK3cbQd nDAXTv+hSJ4VwZJJAXtYHyU0Qqh1O65pCxRgLaCs3jBPL8Duq41NAihf+8LFkp0zKnzfgoye 8bo1fLMKz7pOY/sI5s0gJNsAEQEAAYkCPAQYAQgAJhYhBNoHu6wB/E0ox6prpirX0XUqXRtN BQJY7Y4cAhsMBQkFo5qAAAoJECrX0XUqXRtNJGsP/RE9YbGYQEK81Fsq4bQgs+J0PY1p8jct QOQP6e01sp9SUXpcZsTbQIQn+vQNOXprH71+WPY2p3ZBb2DNLUw7uoZo25Go78YVSsjQP19K h5WZfY6JH0FeVkyXK/kv3bOPwq1U1qsY54KE+33f//+6YjRgVyUn16oASImyVHLmuwn+N+1Y hZJ/FTlYPP9/ZlEuzLBBff1upT40lT+1yQSoyGGwKGNzvIYZghBoDAmiau7wpFECpkRijkQ1 7QQxHE472p0yO+IOglNLWhO7cMtnrgF2q1ZGE/uGo/ouBkMxOXbzFPEx6SlKr89tpXnDKr9W 7IVNWdX8c1kt0XDNgtfXa9DLJ2mqkN6KTXwDIBlE63+KJwfbjoAz/n48yKaReiCxwf/1N3sp saRzLCbEPPaCzQyknk33Tr/hODx+aTib02gE9Vvbr7+SCg+UoLNDvmf4xMH0qaR35C6AgBS4 auVyx3qNbRrEBgTTZDWgjQ3mX3IzdaMIJ5PXslBhdZG9w7KMIN+00jIqOQ7vdsBo3oQgmDZo 0EixDe3gezOPG8OkbxaBXzED6C6A0Ujh9ppenIZueoWUcNpmPRYFBD+4ZlsWAPuuGALKHjbo FBb//0jym6NzJPVuz1a9mNXDfgeOnQG9lfMq1q6P/1gofgSHqGE8Mu92EHsNo/8Sc3IgXtC8 V13X Message-ID: Date: Wed, 5 Feb 2020 18:19:21 +0900 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1 MIME-Version: 1.0 In-Reply-To: <20200205003236-mutt-send-email-mst@kernel.org> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org On 2/5/20 2:33 PM, Michael S. Tsirkin wrote: > On Tue, Feb 04, 2020 at 04:16:55PM +0900, Yuya Kusakabe wrote: >> @@ -852,8 +868,9 @@ static struct sk_buff *receive_mergeable(struct net_device *dev, >> * adjustments. Note other cases do not build an >> * skb and avoid using offset >> */ >> - offset = xdp.data - >> - page_address(xdp_page) - vi->hdr_len; >> + metasize = xdp.data - xdp.data_meta; >> + offset = xdp.data - page_address(xdp_page) - >> + vi->hdr_len - metasize; >> >> /* recalculate len if xdp.data or xdp.data_end were >> * adjusted > > Tricky to get one's head around. > Can you pls update the comment above to document the new math? > Thank you for your review. I will update the comment on next patch.