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=-2.4 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY,USER_AGENT_SANE_1 autolearn=no 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 6676FC3815B for ; Fri, 17 Apr 2020 17:08:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4937822209 for ; Fri, 17 Apr 2020 17:08:49 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="GJJsNhUf" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728940AbgDQRIq (ORCPT ); Fri, 17 Apr 2020 13:08:46 -0400 Received: from aserp2120.oracle.com ([141.146.126.78]:51050 "EHLO aserp2120.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728020AbgDQRIp (ORCPT ); Fri, 17 Apr 2020 13:08:45 -0400 Received: from pps.filterd (aserp2120.oracle.com [127.0.0.1]) by aserp2120.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 03HH8Emn164795; Fri, 17 Apr 2020 17:08:26 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=date : from : to : cc : subject : in-reply-to : message-id : references : mime-version : content-type; s=corp-2020-01-29; bh=9AuAKei1InWbZiUi954FqxZ6IMH4o42cp4Zcjvsq5TU=; b=GJJsNhUfXpcSqBvF7jDngmW0MRJw+h461HG+bRbezlfBsv0QFGTBw2XqkGRtCcwLu/xX WDiT2eLR1yBIaT+Bl3wQShCLJ2z7X9078sV7ywYB83649n8lZXzdtggtusjLA+jLS8yN shn8ZekAdpIOwaxXZAvyZvX0wquk7Q8Hx3fJ95gEAJqZlSlDiQ3CDddDmRUznPzV3Msd 0jlV06+JJe17tuNh/XGqLxgTXktZTmEC9ISSjhbqA/R+xdGdi6BkdWg/yuAhZB9p27Jj 85fWXr10S7q357QQ2oPsN9aFhZHOO11QLvLw+95z3Jmyq0oRQLS+RReSpYJf7iXmpyug 5g== Received: from userp3020.oracle.com (userp3020.oracle.com [156.151.31.79]) by aserp2120.oracle.com with ESMTP id 30dn9608ra-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 17 Apr 2020 17:08:26 +0000 Received: from pps.filterd (userp3020.oracle.com [127.0.0.1]) by userp3020.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 03HH3PK2029576; Fri, 17 Apr 2020 17:06:26 GMT Received: from userv0122.oracle.com (userv0122.oracle.com [156.151.31.75]) by userp3020.oracle.com with ESMTP id 30emerd6j6-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 17 Apr 2020 17:06:25 +0000 Received: from abhmp0003.oracle.com (abhmp0003.oracle.com [141.146.116.9]) by userv0122.oracle.com (8.14.4/8.14.4) with ESMTP id 03HH6Obc009578; Fri, 17 Apr 2020 17:06:24 GMT Received: from dhcp-10-175-205-33.vpn.oracle.com (/10.175.205.33) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Fri, 17 Apr 2020 10:06:24 -0700 Date: Fri, 17 Apr 2020 18:06:16 +0100 (BST) From: Alan Maguire X-X-Sender: alan@localhost To: Arnaldo Carvalho de Melo cc: Alan Maguire , ast@kernel.org, daniel@iogearbox.net, yhs@fb.com, kafai@fb.com, songliubraving@fb.com, andriin@fb.com, john.fastabend@gmail.com, kpsingh@chromium.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, bpf@vger.kernel.org Subject: Re: [RFC PATCH bpf-next 0/6] bpf, printk: add BTF-based type printing In-Reply-To: <20200417164747.GD17973@kernel.org> Message-ID: References: <1587120160-3030-1-git-send-email-alan.maguire@oracle.com> <20200417164747.GD17973@kernel.org> User-Agent: Alpine 2.21 (LRH 202 2017-01-01) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9594 signatures=668686 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 adultscore=0 mlxscore=0 suspectscore=3 mlxlogscore=999 phishscore=0 spamscore=0 bulkscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2004170131 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9594 signatures=668686 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 adultscore=0 clxscore=1011 malwarescore=0 bulkscore=0 priorityscore=1501 lowpriorityscore=0 mlxscore=0 phishscore=0 spamscore=0 impostorscore=0 suspectscore=3 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2004170132 Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org On Fri, 17 Apr 2020, Arnaldo Carvalho de Melo wrote: > Em Fri, Apr 17, 2020 at 11:42:34AM +0100, Alan Maguire escreveu: > > To give a flavour for what the printed-out data looks like, > > here we use pr_info() to display a struct sk_buff *. Note > > we specify the 'N' modifier to show type field names: > > > > struct sk_buff *skb = alloc_skb(64, GFP_KERNEL); > > > > pr_info("%pTN", skb); > > > > ...gives us: > > > > {{{.next=00000000c7916e9c,.prev=00000000c7916e9c,{.dev=00000000c7916e9c|.dev_scratch=0}}|.rbnode={.__rb_parent_color=0,.rb_right=00000000c7916e9c,.rb_left=00000000c7916e9c}|.list={.next=00000000c7916e9c,.prev=00000000c7916e9c}},{.sk=00000000c7916e9c|.ip_defrag_offset=0},{.tstamp=0|.skb_mstamp_ns=0},.cb=['\0'],{{._skb_refdst=0,.destructor=00000000c7916e9c}|.tcp_tsorted_anchor={.next=00000000c7916e9c,.prev=00000000c7916e9c}},._nfct=0,.len=0,.data_len=0,.mac_len=0,.hdr_len=0,.queue_mapping=0,.__cloned_offset=[],.cloned=0x0,.nohdr=0x0,.fclone=0x0,.peeked=0x0,.head_frag=0x0,.pfmemalloc=0x0,.active_extensions=0,.headers_start=[],.__pkt_type_offset=[],.pkt_type=0x0,.ignore_df=0x0,.nf_trace=0x0,.ip_summed=0x0,.ooo_okay=0x0,.l4_hash=0x0,.sw_hash=0x0,.wifi_acked_valid=0x0,.wifi_acked=0x0,.no_fcs=0x0,.encapsulation=0x0,.encap_hdr_csum=0x0,.csum_valid=0x0,.__pkt_vlan_present_offset=[],.vlan_present=0x0,.csum_complete_sw=0x0,.csum_level=0x0,.csum_not_inet=0x0,.dst_pending_co > > One suggestion, to make this more compact, one could have %pTNz sk_buff>" that wouldn't print any integral type member that is zeroed > :-) > That's a great idea, thanks Arnaldo! I'll add that. Alan > - Arnaldo >