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=-0.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS 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 83BBDCA9EBB for ; Mon, 4 Nov 2019 02:08:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 332D22067D for ; Mon, 4 Nov 2019 02:08:13 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=coverfire.com header.i=@coverfire.com header.b="Mn9trFmj" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728833AbfKDCIM (ORCPT ); Sun, 3 Nov 2019 21:08:12 -0500 Received: from mail-qk1-f196.google.com ([209.85.222.196]:37574 "EHLO mail-qk1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728227AbfKDCIM (ORCPT ); Sun, 3 Nov 2019 21:08:12 -0500 Received: by mail-qk1-f196.google.com with SMTP id e187so3396890qkf.4 for ; Sun, 03 Nov 2019 18:08:12 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=coverfire.com; s=google; h=message-id:subject:from:to:cc:date:in-reply-to:references :user-agent:mime-version:content-transfer-encoding; bh=NZjd1aiE9ljfVyAYAzmVOMl1dm7M7bVI1+859Yvsuy4=; b=Mn9trFmjs68dJ50ygRmLgqUHFvL0TJmACdy2aoW2tUO3BLClWdSF1qTRAfQRD/Hkrr TMgF3WdJGW2WKP6rrgRH4ONQcj+Vjrc16KSroyYRYwWQFSr/iPQr8GlzM6Ith9qMQo8O gT8D8y8dp3kiShYRaL2yOK//vS4viogmucdRoJQhmjb0Wkl8FA0lzcNR191wN3htQDz+ 5yPEp98QWhZ9MLZArTjs0Ch/9u1uzBzc5xu4V3iHk0BUV4M+gwSaRF8ikMG4ouDlkkvN rLOCD7bI/zjPdZStNDzddlA16eRy9ecHjShjmbx0wn4ut/H/ImOpAEIQjshZ9XvQ1QeH JljQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:message-id:subject:from:to:cc:date:in-reply-to :references:user-agent:mime-version:content-transfer-encoding; bh=NZjd1aiE9ljfVyAYAzmVOMl1dm7M7bVI1+859Yvsuy4=; b=YGYSRdn0xZ9y7L1A80CeLd1/iSZJ3rg4zTAkG9tLAJ+sgGBAdtu8KdvZV9o1u5mG0W kaQUNaGQrQBqgbq+Gc2QzHNI3GjkewvsnTSQ4N6L8iumarkaDM/8OZUSGPYVwTdu3IS5 /S4JI94bPfaIQ/3ih560LBq8xOo789s4vBN4Hrxif0Ef6JY3RIURFROeRpVNTw8tayky w1Mhtcfju69itkp6+p/cBT/E2tE2tPit9hhZNr9Yvi4gMAcwdjrHFROz9dE/qqGDJPxF N5J/UuKFWduSmXJTL3Ee53Cl4DUlJ6Kutmu9K8Qvkd+YTsye/UodqDzlWvHgUcaWu7+w a3vw== X-Gm-Message-State: APjAAAX5pMVXy4G/TsU4l+qSxW+ES5DOuxV3lQiLF/b8hvVixjMoGL16 ngvxue9CWSQV8NNVPwbJWLkStQ== X-Google-Smtp-Source: APXvYqyfHeKPje0Zs+td+720nNdYHowg5XX/TSNKHED/Ko7t6ratKpzO8Pb3oTDD4F8fUFumf1/Opw== X-Received: by 2002:a37:a00f:: with SMTP id j15mr6707654qke.103.1572833291510; Sun, 03 Nov 2019 18:08:11 -0800 (PST) Received: from localhost.home ([69.41.199.68]) by smtp.gmail.com with ESMTPSA id x194sm3617001qkb.66.2019.11.03.18.08.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 03 Nov 2019 18:08:10 -0800 (PST) Message-ID: <82fb2eba56d84887772f9d533faa7bda9e3b2ee4.camel@coverfire.com> Subject: Re: [Intel-wired-lan] FW: [PATCH bpf-next 2/4] xsk: allow AF_XDP sockets to receive packets directly from a queue From: dan@coverfire.com To: Jakub Kicinski , "Samudrala, Sridhar" Cc: bjorn.topel@gmail.com, alexei.starovoitov@gmail.com, bjorn.topel@intel.com, bpf@vger.kernel.org, intel-wired-lan@lists.osuosl.org, maciej.fijalkowski@intel.com, magnus.karlsson@intel.com, netdev@vger.kernel.org, toke@redhat.com, tom.herbert@intel.com, David Miller Date: Sun, 03 Nov 2019 21:08:08 -0500 In-Reply-To: <20191031172148.0290b11f@cakuba.netronome.com> References: <2e27b8d9-4615-cd8d-93de-2adb75d8effa@intel.com> <20191031172148.0290b11f@cakuba.netronome.com> Content-Type: text/plain; charset="UTF-8" User-Agent: Evolution 3.34.1 (3.34.1-1.fc31) MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: bpf-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org On Thu, 2019-10-31 at 17:21 -0700, Jakub Kicinski wrote: > > My concern was that we want the applications to encode fast path > logic > in BPF and load that into the kernel. So your patch works > fundamentally > against that goal: I'm only one AF_XDP user but my main goal is to get packets to userspace as fast as possible. I don't (currently) need a BPF program in the path at all. I suspect that many other people that look at AF_XDP as a DPDK replacement have a similar view.