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 DAFCDC433DF for ; Mon, 18 May 2020 03:40:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B69F420674 for ; Mon, 18 May 2020 03:40:35 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="jM27OTaM" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727873AbgERDkf (ORCPT ); Sun, 17 May 2020 23:40:35 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41094 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726680AbgERDke (ORCPT ); Sun, 17 May 2020 23:40:34 -0400 Received: from mail-qk1-x743.google.com (mail-qk1-x743.google.com [IPv6:2607:f8b0:4864:20::743]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DF99BC061A0C for ; Sun, 17 May 2020 20:40:32 -0700 (PDT) Received: by mail-qk1-x743.google.com with SMTP id s1so8827745qkf.9 for ; Sun, 17 May 2020 20:40:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=M65DOpRf+5y4QtRlmmeu6UEPb9j6/mdRmbnjg+ZOFAc=; b=jM27OTaML8y9dY3KWRHySm14eA+6jNh/+AdFfztK+fmSPA1YXk11/toKwSonprsUNG dBCKXVI/BsbHgkbL+BDAPj5BvBOAgbGHgEBsQyKvmPNjuKzA3So8YOxsCvd0R0UhYK0a 9OhH8jwT8H4EBRFfuGXPbq04ms69+tHC4gsC82oMQ4j+utXmEbaa32KShjhRHteYHwF3 MJG+do7MrqTsL+wJYEDyj4EAX9XiJc6WfX1IVGU83JdSDlDsMk6stcu35imN8MlNDrNO AcMlN6do2R/XpCPbNN6M80Sit97Vvq2cYzC0G+VtapQJsEqzBYPhu8rVS+MhCKr3hoDJ dWjw== 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:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=M65DOpRf+5y4QtRlmmeu6UEPb9j6/mdRmbnjg+ZOFAc=; b=CBRtcUhxOWF39Rke5bzujSSQMym78Nbt7qIfrtJ7b3BlFs440Bv/Khij0hu/wap7RB MQuSoqlSygZDUCAPyvwnF7IP3jrTwdjEnhxOd6Jylwp5AvpttrONNUTIWMd56i1M5ulw 39KfzFVOPSl0cRftZlWx1fj+Boi5oj37WZIX6kU2zAfTl3L8G2ndB/KA0lHtd+BOgvBy QlLqaE4aQ7Z0eTWlAxE+AJsoD2jt1VVr55mxFNE8ablUBB95p5oJIDx4n5RgjkqFfFjq NATdAZPD9C9kW9zBTVu21ucJcradJqwNXp8PgFME4dwwPBZM6QgP1M1H5po3omzUNxfS JRig== X-Gm-Message-State: AOAM530QvnuAzD3IhJjZi5ZtuZNXNoMvc+7vybxPxKO5h4UYdr43EKlJ yhUyT/N8vzTv8Lh8hkRJysw= X-Google-Smtp-Source: ABdhPJwM53JvUKn1MhDma23DpLAW6TMO8wbTq1mjz4C2N6YW5xJelq7aaXxziIGFQJeT0SOJgtP14Q== X-Received: by 2002:a37:aa4e:: with SMTP id t75mr13578601qke.46.1589773231040; Sun, 17 May 2020 20:40:31 -0700 (PDT) Received: from ?IPv6:2601:282:803:7700:f866:b23:9405:7c31? ([2601:282:803:7700:f866:b23:9405:7c31]) by smtp.googlemail.com with ESMTPSA id z25sm8463945qtj.75.2020.05.17.20.40.29 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 17 May 2020 20:40:30 -0700 (PDT) Subject: Re: [PATCH v5 bpf-next 00/11] net: Add support for XDP in egress path To: John Fastabend , =?UTF-8?Q?Toke_H=c3=b8iland-J=c3=b8rgensen?= , David Ahern , netdev@vger.kernel.org Cc: davem@davemloft.net, kuba@kernel.org, prashantbhole.linux@gmail.com, brouer@redhat.com, daniel@iogearbox.net, ast@kernel.org, kafai@fb.com, songliubraving@fb.com, yhs@fb.com, andriin@fb.com, David Ahern References: <20200513014607.40418-1-dsahern@kernel.org> <87sgg4t8ro.fsf@toke.dk> <54fc70be-fce9-5fd2-79f3-b88317527c6b@gmail.com> <5ebf1d9cdc146_141a2acf80de25b892@john-XPS-13-9370.notmuch> From: David Ahern Message-ID: Date: Sun, 17 May 2020 21:40:28 -0600 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:68.0) Gecko/20100101 Thunderbird/68.8.0 MIME-Version: 1.0 In-Reply-To: <5ebf1d9cdc146_141a2acf80de25b892@john-XPS-13-9370.notmuch> 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 I am trying to understand the resistance here. There are ingress/egress hooks for most of the layers - tc, netfilter, and even within bpf APIs. Clearly there is a need for this kind of symmetry across the APIs, so why the resistance or hesitation for XDP? Stacking programs on the Rx side into the host was brought up 9 revisions ago when the first patches went out. It makes for an unnecessarily complicated design and is antithetical to the whole Unix/Linux philosophy of small focused programs linked together to provide a solution. Can you elaborate on your concerns?