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=-2.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_MUTT 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 94AA2C43381 for ; Sun, 17 Feb 2019 23:05:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6E163218AC for ; Sun, 17 Feb 2019 23:05:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727378AbfBQXFg (ORCPT ); Sun, 17 Feb 2019 18:05:36 -0500 Received: from mx1.redhat.com ([209.132.183.28]:60660 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726283AbfBQXFg (ORCPT ); Sun, 17 Feb 2019 18:05:36 -0500 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id E3703A24E5; Sun, 17 Feb 2019 23:05:35 +0000 (UTC) Received: from krava (ovpn-204-33.brq.redhat.com [10.40.204.33]) by smtp.corp.redhat.com (Postfix) with SMTP id 65F425D964; Sun, 17 Feb 2019 23:05:33 +0000 (UTC) Date: Mon, 18 Feb 2019 00:05:32 +0100 From: Jiri Olsa To: Song Liu Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, ast@kernel.org, daniel@iogearbox.net, kernel-team@fb.com, peterz@infradead.org, acme@redhat.com, jolsa@kernel.org, namhyung@kernel.org Subject: Re: [PATCH v3 perf,bpf 06/11] perf, bpf: save bpf_prog_info information as headers to perf.data Message-ID: <20190217230532.GC7443@krava> References: <20190215215354.3114006-1-songliubraving@fb.com> <20190215215354.3114006-7-songliubraving@fb.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190215215354.3114006-7-songliubraving@fb.com> User-Agent: Mutt/1.10.1 (2018-07-13) X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.39]); Sun, 17 Feb 2019 23:05:36 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Feb 15, 2019 at 01:53:49PM -0800, Song Liu wrote: SNIP > +static int process_bpf_prog_info(struct feat_fd *ff, > + void *data __maybe_unused) > +{ > + struct bpf_prog_info_linear *info_linear; > + struct bpf_prog_info_node *info_node; > + struct perf_env *env = &ff->ph->env; > + u32 count, i; > + int err = -1; > + > + if (do_read_u32(ff, &count)) > + return -1; > + > + down_write(&env->bpf_progs.bpf_info_lock); > + > + for (i = 0; i < count; ++i) { > + u32 info_len, data_len; > + > + info_linear = NULL; > + info_node = NULL; > + if (do_read_u32(ff, &info_len)) > + goto out; > + if (do_read_u32(ff, &data_len)) > + goto out; > + > + if (info_len > sizeof(struct bpf_prog_info)) { > + pr_warning("detected invalid bpf_prog_info\n"); > + goto out; > + } > + > + info_linear = malloc(sizeof(struct bpf_prog_info_linear) + > + data_len); > + if (!info_linear) > + goto out; > + info_linear->info_len = sizeof(struct bpf_prog_info); > + info_linear->data_len = data_len; > + if (do_read_u64(ff, (u64 *)(&info_linear->arrays))) > + goto out; > + if (__do_read(ff, &info_linear->info, info_len)) > + goto out; hum, hows the endianity swap handled for struct bpf_prog_info? > + if (info_len < sizeof(struct bpf_prog_info)) > + memset(((void *)(&info_linear->info)) + info_len, 0, > + sizeof(struct bpf_prog_info) - info_len); > + > + if (__do_read(ff, info_linear->data, data_len)) > + goto out; and the data? thanks, jirka