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, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,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 D8D9CCA9EB9 for ; Sat, 26 Oct 2019 18:42:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id ADB292084C for ; Sat, 26 Oct 2019 18:42:14 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=netronome-com.20150623.gappssmtp.com header.i=@netronome-com.20150623.gappssmtp.com header.b="Yjawuzne" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726378AbfJZSmO (ORCPT ); Sat, 26 Oct 2019 14:42:14 -0400 Received: from mail-pl1-f193.google.com ([209.85.214.193]:37250 "EHLO mail-pl1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726318AbfJZSmO (ORCPT ); Sat, 26 Oct 2019 14:42:14 -0400 Received: by mail-pl1-f193.google.com with SMTP id p13so3196455pll.4 for ; Sat, 26 Oct 2019 11:42:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=netronome-com.20150623.gappssmtp.com; s=20150623; h=date:from:to:cc:subject:message-id:in-reply-to:references :organization:mime-version:content-transfer-encoding; bh=+pUCwMw0bp6t9+incf6kf82pqWqXRfoOQ0MAJqkoLgI=; b=YjawuznejfBEfvkpQELvzCVAPNLadqBg+wsjEh7t38cig6hWMf8Cd+CfuRJhPZbhf2 9R6zWQr7i1oc5p0sn6MOpNFze8FMpSfC/G8SdP5luQuoWJsOR4ONyLLklXQMi89V8Hjq Ybgqk3RZ53rb0Qjo9iN3zxDp/vXIm4Da1xBn4v1yNVdjP+uEoKtA0CeDNl87cVj2oTKq Ee65PRikFFSqCIfQFS0qi0D+ROZURWlPCcE7sfSyATEg6BzUEb6avHXE2aZmZWaDUmdg AMK4NA2SuF9TmJBtj/nPPWaU0nsgoo/6weJ7xuhob/cl3wZAxDT39ItUURySMYcIYH8m yQag== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:in-reply-to :references:organization:mime-version:content-transfer-encoding; bh=+pUCwMw0bp6t9+incf6kf82pqWqXRfoOQ0MAJqkoLgI=; b=DWeKJhuVhe4HjFBMSAjUWwRBcE/HKqf/4lbdqCbvyBhzqaK5oUzuxsNOyxKzzXQAR2 Cym1vnAjYXOo525LxpuVehJyEy20zkPPX6lbL56KA1KBN4BLfNqahZOcSUQbRp+fa871 5h4ZwFYbQsb970zrTB/TAYLLhsOvDtwYYaRG6HpVrVDhOcpWTz2/2tq267JZy5inyYca dyT1FXHVYVb4zas/NNqeRUe+sdg2G7i3nQUVQsigkqUgjBRob1wYRWMiEZPLU6im/87I Yk8LBHubRZzxGkT0ZryuAr5VfT+Np4cryxP5lB9JABsv89UuRlidJwgi4mACrShYb9lK nZvA== X-Gm-Message-State: APjAAAVFDZ8oT4PLD3u9Sm0jon3CFHJGiXCEGii5ZfJMasPQMtCrz5Zl zTjutDGayrdtuVcduJ+71fF8Mg== X-Google-Smtp-Source: APXvYqw1t8yDc5FGwNtOxkMmz1zB2cM5/0ECTYGbRXmQH3WJhzhJ8BMB8JTkmpnfKo5OG2nm4tOGwg== X-Received: by 2002:a17:902:6944:: with SMTP id k4mr10922717plt.175.1572115332989; Sat, 26 Oct 2019 11:42:12 -0700 (PDT) Received: from cakuba.hsd1.ca.comcast.net (c-73-202-202-92.hsd1.ca.comcast.net. [73.202.202.92]) by smtp.gmail.com with ESMTPSA id x10sm5722604pgl.53.2019.10.26.11.42.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 26 Oct 2019 11:42:12 -0700 (PDT) Date: Sat, 26 Oct 2019 11:42:08 -0700 From: Jakub Kicinski To: Jiri Olsa Cc: Jiri Olsa , Alexei Starovoitov , Daniel Borkmann , netdev@vger.kernel.org, bpf@vger.kernel.org, Andrii Nakryiko , Yonghong Song , Martin KaFai Lau Subject: Re: [PATCH] bpftool: Allow to read btf as raw data Message-ID: <20191026114208.49e35169@cakuba.hsd1.ca.comcast.net> In-Reply-To: <20191025200351.GA31835@krava> References: <20191024133025.10691-1-jolsa@kernel.org> <20191025113901.5a7e121e@cakuba.hsd1.ca.comcast.net> <20191025200351.GA31835@krava> Organization: Netronome Systems, Ltd. MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Sender: bpf-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org On Fri, 25 Oct 2019 22:03:51 +0200, Jiri Olsa wrote: > On Fri, Oct 25, 2019 at 11:39:01AM -0700, Jakub Kicinski wrote: > > On Thu, 24 Oct 2019 15:30:25 +0200, Jiri Olsa wrote: =20 > > > The bpftool interface stays the same, but now it's possible > > > to run it over BTF raw data, like: > > >=20 > > > $ bpftool btf dump file /sys/kernel/btf/vmlinux > > > [1] INT '(anon)' size=3D4 bits_offset=3D0 nr_bits=3D32 encoding=3D(= none) > > > [2] INT 'long unsigned int' size=3D8 bits_offset=3D0 nr_bits=3D64 e= ncoding=3D(none) > > > [3] CONST '(anon)' type_id=3D2 > > >=20 > > > Signed-off-by: Jiri Olsa =20 > >=20 > > Acked-by: Jakub Kicinski =20 >=20 > [root@ibm-z-107 bpftool]# ./bpftool btf dump file /sys/kernel/btf/vmlinux= | head -3 > [1] INT '(anon)' size=3D4 bits_offset=3D0 nr_bits=3D32 encoding=3D(none) > [2] INT 'long unsigned int' size=3D8 bits_offset=3D0 nr_bits=3D64 encodin= g=3D(none) > [3] CONST '(anon)' type_id=3D2 > [root@ibm-z-107 bpftool]# lscpu | grep Endian > Byte Order: Big Endian Thanks for checking! I thought the on-disk format is fixed like the ELF magic number. But if two bads make a right then all is good =E2=98=BA= =EF=B8=8F