From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 35F2620EC for ; Mon, 30 Oct 2023 09:36:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=resnulli-us.20230601.gappssmtp.com header.i=@resnulli-us.20230601.gappssmtp.com header.b="mW2ANFGG" Received: from mail-ej1-x629.google.com (mail-ej1-x629.google.com [IPv6:2a00:1450:4864:20::629]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1A4F3B3 for ; Mon, 30 Oct 2023 02:36:03 -0700 (PDT) Received: by mail-ej1-x629.google.com with SMTP id a640c23a62f3a-9ae2cc4d17eso647583766b.1 for ; Mon, 30 Oct 2023 02:36:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=resnulli-us.20230601.gappssmtp.com; s=20230601; t=1698658561; x=1699263361; darn=vger.kernel.org; h=content-disposition:mime-version:message-id:subject:to:from:date :from:to:cc:subject:date:message-id:reply-to; bh=uZCucFCd6/ZhRwrT9dPLVuma1cv227mEXSsAvccimvY=; b=mW2ANFGGf0d/0bzDdvm4qVYCy9c/qM8QtJ6aShmoZSIYQ8rLVPImYh1a05/8ylxxDL Mva8Imymnr/fjL9wesObE5iJz2v6YITJYBj6PwfnQCFVMJtufwsnbiKMsCODR8AKy8Fr IjPD68X+fTTrspZ2uH4ZG42C9IprZEuhbXUyhM0deL+pAOoLUY68zz9PMY7uDtkh240M 0SudsAbrSLbEUjwoJEHYqon98YDFqOhJo2RBf1HgUkfxZwI2V81/xbynx9LLGUdlgwn9 4SBDudXK5Sm/Byl3xbXxXdF2NVbLYFZZ5b/4zy8U0BzhEaZPx1IBZmBGjJpBqbkiyg87 w+5Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1698658561; x=1699263361; h=content-disposition:mime-version:message-id:subject:to:from:date :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=uZCucFCd6/ZhRwrT9dPLVuma1cv227mEXSsAvccimvY=; b=ePH4Kpj45QFErUtWqGI2fpgH3WKcZl02ptAmmP1u2pkzHJxWH/GdfxAMTN34zFpd0+ 56Gnuh6DpQjeZzQmnZd5fWw/vyQ0bBwQTYpcWTnnl1Fvdl3n2bBjGVJMN4ohnQGPUdgC 6EeFMPHMTMX4Q0UdExKajDQhJeiURAB9STFSOVOd4XKz5RD/XG7emC7Y53CUYHYeUsZW iDvslbVq0XABWzesf0ccfyXp34AicpdRj4nmyvPj8IHYcufbwEO6K224kSd1RuUpBkjT wzHh6QT6BMzvRrHV1hpWONfcvFKZyuzPiHoW2NPQtWxl0dMYm7mRRarmP8JqTGgaEsRK BVdw== X-Gm-Message-State: AOJu0YyIaUUVxb/OVwSM8nk3EfscqYYJkQUyXlVqGsl64M1OnjrDoFSW jJVNAEduEYNCXHoqzQ7w4EzJpf/qCDOKPmk/z+I= X-Google-Smtp-Source: AGHT+IHZDNHObIRPxSfGXdvodWZBeK32qjqyW+mzMoNhfYrLGnByurfQyAfextEPHdmQ2+INhDvehQ== X-Received: by 2002:a17:907:1c1f:b0:9bd:a063:39d2 with SMTP id nc31-20020a1709071c1f00b009bda06339d2mr7821537ejc.16.1698658561496; Mon, 30 Oct 2023 02:36:01 -0700 (PDT) Received: from localhost (host-213-179-129-39.customer.m-online.net. [213.179.129.39]) by smtp.gmail.com with ESMTPSA id e3-20020a170906044300b009cd1fca4d68sm5660801eja.5.2023.10.30.02.36.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 30 Oct 2023 02:36:00 -0700 (PDT) Date: Mon, 30 Oct 2023 10:35:59 +0100 From: Jiri Pirko To: bpf@vger.kernel.org Subject: kfunc use newbie question Message-ID: Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Hi BPF :) I'm trying to use bpf_dynptr_from_skb() kfunc in my program. I compiled it with having following declaration in the bpf .c file: extern int bpf_dynptr_from_skb(struct __sk_buff *skb, __u64 flags, struct bpf_dynptr *ptr__uninit) __ksym; I have all "BPF/BTF" kernel config options on. During load, I'm still getting: libbpf: failed to find BTF for extern 'bpf_dynptr_from_skb': -3 I'm pretty much clueless about what may be wrong. Documentation didn't help me either :/ Any idea what I may be doing wrong? Thanks Jiri