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=-19.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 E5958C4320A for ; Mon, 26 Jul 2021 16:13:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CEDF060F5D for ; Mon, 26 Jul 2021 16:13:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233763AbhGZPci (ORCPT ); Mon, 26 Jul 2021 11:32:38 -0400 Received: from mail.kernel.org ([198.145.29.99]:42756 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236791AbhGZP3K (ORCPT ); Mon, 26 Jul 2021 11:29:10 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 183CE60FF3; Mon, 26 Jul 2021 16:07:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1627315654; bh=VGyoVYkRzIp27UeMvuqYUiTyiwLx8aO8kbggpO6HfO0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=vm0sqDM8aPZeOqP0CTijW9DVd1CUVKalWJBreT6nQI+vJvseJO4+tZYGbu/m+jguF kmvF+kMivyV1C7sDD0UtH8vK4fMr9n+9GbrZF/xX+7P1Xqeg+XVqRVeakmFKz5cdOZ H7qvUU8bfyjYnYKJd9vxGmJzVD+Id2WZ4jisul4A= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Wang Hai , Daniel Borkmann , Magnus Karlsson , Maciej Fijalkowski , Sasha Levin Subject: [PATCH 5.13 014/223] bpf, samples: Fix xdpsock with -M parameter missing unload process Date: Mon, 26 Jul 2021 17:36:46 +0200 Message-Id: <20210726153846.727497218@linuxfoundation.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210726153846.245305071@linuxfoundation.org> References: <20210726153846.245305071@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Wang Hai [ Upstream commit 2620e92ae6ed83260eb46d214554cd308ee35d92 ] Execute the following command and exit, then execute it again, the following error will be reported: $ sudo ./samples/bpf/xdpsock -i ens4f2 -M ^C $ sudo ./samples/bpf/xdpsock -i ens4f2 -M libbpf: elf: skipping unrecognized data section(16) .eh_frame libbpf: elf: skipping relo section(17) .rel.eh_frame for section(16) .eh_frame libbpf: Kernel error message: XDP program already attached ERROR: link set xdp fd failed Commit c9d27c9e8dc7 ("samples: bpf: Do not unload prog within xdpsock") removed the unloading prog code because of the presence of bpf_link. This is fine if XDP_SHARED_UMEM is disabled, but if it is enabled, unloading the prog is still needed. Fixes: c9d27c9e8dc7 ("samples: bpf: Do not unload prog within xdpsock") Signed-off-by: Wang Hai Signed-off-by: Daniel Borkmann Acked-by: Magnus Karlsson Cc: Maciej Fijalkowski Link: https://lore.kernel.org/bpf/20210628091815.2373487-1-wanghai38@huawei.com Signed-off-by: Sasha Levin --- samples/bpf/xdpsock_user.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) diff --git a/samples/bpf/xdpsock_user.c b/samples/bpf/xdpsock_user.c index 53e300f860bb..33d0bdebbed8 100644 --- a/samples/bpf/xdpsock_user.c +++ b/samples/bpf/xdpsock_user.c @@ -96,6 +96,7 @@ static int opt_xsk_frame_size = XSK_UMEM__DEFAULT_FRAME_SIZE; static int opt_timeout = 1000; static bool opt_need_wakeup = true; static u32 opt_num_xsks = 1; +static u32 prog_id; static bool opt_busy_poll; static bool opt_reduced_cap; @@ -461,6 +462,23 @@ static void *poller(void *arg) return NULL; } +static void remove_xdp_program(void) +{ + u32 curr_prog_id = 0; + + if (bpf_get_link_xdp_id(opt_ifindex, &curr_prog_id, opt_xdp_flags)) { + printf("bpf_get_link_xdp_id failed\n"); + exit(EXIT_FAILURE); + } + + if (prog_id == curr_prog_id) + bpf_set_link_xdp_fd(opt_ifindex, -1, opt_xdp_flags); + else if (!curr_prog_id) + printf("couldn't find a prog id on a given interface\n"); + else + printf("program on interface changed, not removing\n"); +} + static void int_exit(int sig) { benchmark_done = true; @@ -471,6 +489,9 @@ static void __exit_with_error(int error, const char *file, const char *func, { fprintf(stderr, "%s:%s:%i: errno: %d/\"%s\"\n", file, func, line, error, strerror(error)); + + if (opt_num_xsks > 1) + remove_xdp_program(); exit(EXIT_FAILURE); } @@ -490,6 +511,9 @@ static void xdpsock_cleanup(void) if (write(sock, &cmd, sizeof(int)) < 0) exit_with_error(errno); } + + if (opt_num_xsks > 1) + remove_xdp_program(); } static void swap_mac_addresses(void *data) @@ -857,6 +881,10 @@ static struct xsk_socket_info *xsk_configure_socket(struct xsk_umem_info *umem, if (ret) exit_with_error(-ret); + ret = bpf_get_link_xdp_id(opt_ifindex, &prog_id, opt_xdp_flags); + if (ret) + exit_with_error(-ret); + xsk->app_stats.rx_empty_polls = 0; xsk->app_stats.fill_fail_polls = 0; xsk->app_stats.copy_tx_sendtos = 0; -- 2.30.2