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=-7.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,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 151AAC433ED for ; Tue, 27 Apr 2021 21:00:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id ED66E611F2 for ; Tue, 27 Apr 2021 21:00:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239256AbhD0VBi (ORCPT ); Tue, 27 Apr 2021 17:01:38 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57276 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239033AbhD0VBg (ORCPT ); Tue, 27 Apr 2021 17:01:36 -0400 Received: from mail-il1-x12c.google.com (mail-il1-x12c.google.com [IPv6:2607:f8b0:4864:20::12c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F1D70C061763; Tue, 27 Apr 2021 14:00:52 -0700 (PDT) Received: by mail-il1-x12c.google.com with SMTP id c3so360181ils.5; Tue, 27 Apr 2021 14:00:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc:message-id:in-reply-to:references:subject :mime-version:content-transfer-encoding; bh=B9O6HSSSA2HKZOCKluIOarWGuOU/V28mAm16p4AZpog=; b=D04IMBmMDXb6Z0W1Y9ySafEizPw3oANrBF2atbexHhUMMXIah9w/+LyNKudUBcpiOT JEL9dBDyiyR2NjKGl04A31Ce+hpUUJNcKing68Q1yqDwsBYm8mB1/mnRgX04SglSVgus 9ILkvEDeXdm9QLjVrqYaJgNi9SdGy5Syvkc390HuR6tUesse0ldSmUR22AZKmZeDcck6 t5NgwwJwMQavKI3fJkBvRnMO1AoBZVidPvzNe5q180Maim2/1hHdjW5yqKZFBDPPt+Go j6hVaEOfa1KBh5QDUUR6AEuxmzgYiWhL2GiT+72kf7k/QvFo8dhCkW3k/4Rvsd8r066a 3aXg== 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:message-id:in-reply-to :references:subject:mime-version:content-transfer-encoding; bh=B9O6HSSSA2HKZOCKluIOarWGuOU/V28mAm16p4AZpog=; b=eaQ7otF4oge8EyrK9H+sUdD8mcbBIsQ3GVnSLYl/QEZLmZ6tK95K8Kme4FZJqakf6F 3WNSFJTdhmpAtivBUuZxGQgX9DkM8a09wGSVydFZg8+SyklLIaxI92SFF/1UTTknLlk/ zwDejEL30w5nrWJCRfX3GmiKqwP2OKi5d9QQoYEdhTK13sHyoINXlcvyKWDd8ewYr7HN wyvWjzAslEeg+knlCdDFU8SrMPXpB+Zw5xOvSK34f0qIyzQanOsdOvbZ0iVljpQ5qg1R A7rIxd/pjuvg59Eh+uKnwYQlMNrRshPZrZF7Ag4FbBSbot0MRhkImf+99GfRRa9k47il K97A== X-Gm-Message-State: AOAM531YNBWCFbx73WlKwWRkai0Tzs7kHXcLsDK+Svdj49Ct6WaZ+tKN /X6jNXXGbOYVU25zCZ4lNiA= X-Google-Smtp-Source: ABdhPJzO0+9U+FL/VKs1l/V42kmY09zRexDPR8IHo2zt9zpFBADk0hAplX775josdotwPTNhlSkdgg== X-Received: by 2002:a92:5214:: with SMTP id g20mr20724692ilb.219.1619557252439; Tue, 27 Apr 2021 14:00:52 -0700 (PDT) Received: from localhost ([172.242.244.146]) by smtp.gmail.com with ESMTPSA id f13sm1913311ila.62.2021.04.27.14.00.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 27 Apr 2021 14:00:51 -0700 (PDT) Date: Tue, 27 Apr 2021 14:00:43 -0700 From: John Fastabend To: Alexei Starovoitov , davem@davemloft.net Cc: daniel@iogearbox.net, andrii@kernel.org, netdev@vger.kernel.org, bpf@vger.kernel.org, kernel-team@fb.com Message-ID: <60887b7ba5bba_12319208a5@john-XPS-13-9370.notmuch> In-Reply-To: <20210423002646.35043-11-alexei.starovoitov@gmail.com> References: <20210423002646.35043-1-alexei.starovoitov@gmail.com> <20210423002646.35043-11-alexei.starovoitov@gmail.com> Subject: RE: [PATCH v2 bpf-next 10/16] bpf: Add bpf_btf_find_by_name_kind() helper. Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org Alexei Starovoitov wrote: > From: Alexei Starovoitov > > Add new helper: > > long bpf_btf_find_by_name_kind(u32 btf_fd, char *name, u32 kind, int flags) > Description > Find given name with given type in BTF pointed to by btf_fd. > If btf_fd is zero look for the name in vmlinux BTF and in module's BTFs. > Return > Returns btf_id and btf_obj_fd in lower and upper 32 bits. > > Signed-off-by: Alexei Starovoitov > --- I'm missing some high-level concept on how this would be used? Where does btf_fd come from and how is it used so that it doesn't break sig-check? A use-case I'm trying to fit into this series is how to pass down a BTF fd/object with the program. I know its not doing CO-RE yet but we would want it to use the BTF object being passed down for CO-RE eventually. Will there be someway to do that here? That looks like the btf_fd here. Thanks, John