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=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 EECF1C10F14 for ; Fri, 12 Apr 2019 03:04:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BD36B2084D for ; Fri, 12 Apr 2019 03:04:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726833AbfDLDD7 (ORCPT ); Thu, 11 Apr 2019 23:03:59 -0400 Received: from mx2.suse.de ([195.135.220.15]:60984 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726720AbfDLDD7 (ORCPT ); Thu, 11 Apr 2019 23:03:59 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 36402AC6E; Fri, 12 Apr 2019 03:03:58 +0000 (UTC) From: Benjamin Poirier To: Daniel Borkmann Cc: netdev@vger.kernel.org, bpf@vger.kernel.org Subject: [PATCH v2 bpf-next 2/2] bpftool: Improve handling of ENOSPC on reuseport_array map dumps Date: Fri, 12 Apr 2019 12:03:22 +0900 Message-Id: <20190412030322.15494-2-bpoirier@suse.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190412030322.15494-1-bpoirier@suse.com> References: <20190411082700.26888-1-bpoirier@suse.com> <20190412030322.15494-1-bpoirier@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org avoids outputting a series of value: No space left on device The value itself is not wrong but bpf_fd_reuseport_array_lookup_elem() can only return it if the map was created with value_size = 8. There's nothing bpftool can do about it. Instead of repeating this error for every key in the map, print an explanatory warning and a specialized error. example before: key: 00 00 00 00 value: No space left on device key: 01 00 00 00 value: No space left on device key: 02 00 00 00 value: No space left on device Found 0 elements example after: Warning: cannot read values from reuseport_sockarray map with value_size != 8 key: 00 00 00 00 value: key: 01 00 00 00 value: key: 02 00 00 00 value: Found 0 elements Signed-off-by: Benjamin Poirier --- tools/bpf/bpftool/map.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/tools/bpf/bpftool/map.c b/tools/bpf/bpftool/map.c index 71840faaeab5..e6d72f777767 100644 --- a/tools/bpf/bpftool/map.c +++ b/tools/bpf/bpftool/map.c @@ -716,8 +716,12 @@ static int dump_map_elem(int fd, void *key, void *value, } else { const char *msg = NULL; - if (errno == ENOENT) + if (lookup_errno == ENOENT) { msg = ""; + } else if (lookup_errno == ENOSPC && map_info->type == + BPF_MAP_TYPE_REUSEPORT_SOCKARRAY) { + msg = ""; + } print_entry_error(map_info, key, msg ? : strerror(lookup_errno), !!msg); @@ -774,6 +778,11 @@ static int do_dump(int argc, char **argv) } } + if (info.type == BPF_MAP_TYPE_REUSEPORT_SOCKARRAY && + info.value_size != 8) { + p_info("Warning: cannot read values from %s map with value_size != 8", + map_type_name[info.type]); + } while (true) { err = bpf_map_get_next_key(fd, prev_key, key); if (err) { -- 2.21.0