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[2620:137:e000::1:18]) by mx.google.com with ESMTPS id n62-20020a634041000000b003f60495f184si985924pga.236.2022.05.17.21.54.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 17 May 2022 21:54:20 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:18 as permitted sender) client-ip=2620:137:e000::1:18; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=k20201202 header.b=gcJI45JV; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id F315413FD4A; Tue, 17 May 2022 21:03:49 -0700 (PDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S245378AbiEQJoh (ORCPT + 99 others); Tue, 17 May 2022 05:44:37 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37706 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S245287AbiEQJnV (ORCPT ); Tue, 17 May 2022 05:43:21 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4DBBF403CE; Tue, 17 May 2022 02:43:04 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id A181A61525; Tue, 17 May 2022 09:43:03 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id CFAB7C385B8; Tue, 17 May 2022 09:43:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1652780583; bh=Tgs7wjVeAohg0a4a9UvVZ0DjnQPxJiN7q9133B2mpK4=; h=From:To:Cc:Subject:In-Reply-To:References:Date:From; b=gcJI45JVKHpymUm+2nipGubhimzqiurnLTNBUUNn47UUWoOu0RYfESarTrptQrHDO OlF6L/uqYYQ2HOnw34dODO8DziPPMnO2SaUNNTBfQh6dQNPeyWTQDWnBxo5Nm6TDtD frI3L7Sa/+iWn4SI2rewYf0n/KjkRNhe+pfwP9B5Yg+gDQnDp0qnmMPlCel408GnMR gRgAvTcEn/tNOK3UxP0s4MvMFXGdbrKLqNV5UtW2vA6U6wYE0xds0mRHRQKcNVbJUj 0fRgMuOqPG+Wm0bEA3D4lJdXKT7c+qZ5V+/CTY6gpGeOgpZ5TSV1kw0i0zaJdETa8o wazCp7uHJeJGQ== Received: by alrua-x1.borgediget.toke.dk (Postfix, from userid 1000) id AEF4938E92E; Tue, 17 May 2022 11:42:59 +0200 (CEST) From: Toke =?utf-8?Q?H=C3=B8iland-J=C3=B8rgensen?= To: shaozhengchao , "bpf@vger.kernel.org" , "netdev@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "ast@kernel.org" , "daniel@iogearbox.net" , "davem@davemloft.net" , "kuba@kernel.org" , "hawk@kernel.org" , "john.fastabend@gmail.com" , "andrii@kernel.org" , "kafai@fb.com" , "songliubraving@fb.com" , "yhs@fb.com" , "kpsingh@kernel.org" Cc: "weiyongjun (A)" , yuehaibing Subject: Re: =?utf-8?B?562U5aSNOiDnrZTlpI06?= [PATCH bpf-next] samples/bpf: check detach prog exist or not in xdp_fwd In-Reply-To: <942eaafecf074ae8a5bb336c18658453@huawei.com> References: <20220509005105.271089-1-shaozhengchao@huawei.com> <87pmknyr6b.fsf@toke.dk> <87h75zynz2.fsf@toke.dk> <942eaafecf074ae8a5bb336c18658453@huawei.com> X-Clacks-Overhead: GNU Terry Pratchett Date: Tue, 17 May 2022 11:42:59 +0200 Message-ID: <877d6kcx5o.fsf@toke.dk> MIME-Version: 1.0 Content-Type: text/plain X-Spam-Status: No, score=-2.4 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,MAILING_LIST_MULTI, RDNS_NONE,SPF_HELO_NONE,T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > Could I add helper function to implement this function which can check > the program name and see if it attach to the device. You just need to call bpf_prog_get_fd_by_id() followed by bpf_obj_get_info_by_fd(), and the program name will be in info.name. Here's an example in libxdp where we pull out the prog name: https://github.com/xdp-project/xdp-tools/blob/master/lib/libxdp/libxdp.c#L1165 -Toke