From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752636AbcJMIXw (ORCPT ); Thu, 13 Oct 2016 04:23:52 -0400 Received: from mx2.suse.de ([195.135.220.15]:41451 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751991AbcJMIXn (ORCPT ); Thu, 13 Oct 2016 04:23:43 -0400 Date: Thu, 13 Oct 2016 09:39:30 +0200 From: Johannes Thumshirn To: Steffen Maier Cc: "Martin K . Petersen" , Christoph Hellwig , Hannes Reinecke , Linux Kernel Mailinglist , Linux SCSI Mailinglist , linux-s390@vger.kernel.org Subject: Re: [PATCH v2 00/16] Convert FibreChannel bsg code to use bsg-lib Message-ID: <20161013073930.3xpijer2ozsjtriw@linux-x5ow.site> References: <7ad9f92c-e0e9-fa44-ccbf-a6719f040387@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <7ad9f92c-e0e9-fa44-ccbf-a6719f040387@linux.vnet.ibm.com> User-Agent: Mutt/1.6.2 (2016-07-01) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Oct 12, 2016 at 05:54:45PM +0200, Steffen Maier wrote: > Hi Johannes, > > On 10/12/2016 03:06 PM, Johannes Thumshirn wrote: > > This series converts the current bsg usage in the FibreChannel drivers over > > to use bsg-lib. SAS will follow once FC is in a good enough shape. > > > > I did take some inspiration from a similar patchset from Mike Christie > > dating back to 2011 but it's not a 1:1 copy. Patch 15/16 is heavily based > > on his series and attribution is given to him in the commit message. > > > > It is currently regression tested on FCoE using the 'fcns' and > > 'fcrls' utilities. I'm still trying to figure out how to test the other > > LLDDs. So any pointer from the respective maintainers are appreciated > > The first thing that comes to mind for zfcp is libzfcphbaapi and simply run > its tools for starters. They issue a few different CT GLS requests. > http://www.ibm.com/support/knowledgecenter/linuxonibm/com.ibm.linux.z.lhdd/lhdd_t_fcp_api_runappl.html > or > http://www.ibm.com/support/knowledgecenter/linuxonibm/com.ibm.linux.z.lgdd/lgdd_t_fcp_api_runappl.html > (upstream: > http://www.ibm.com/developerworks/linux/linux390/zfcp-hbaapi.html) I'll give it a try, thanks. zfcp_show was the 1st hit on Google as well, when I was looking for a way to test it. > > Theoretically above tools could be built against libHBAAPI on other > architectures. > Currently I don't have anything handy for ELS requests. > > Maybe there is some common code tool (possibly building directly on BSG > IOCTL) to exercise more code paths? Yes this is something I had in mind as well and it could become handy later on anyways. > > Just as a heads up the result of my example run (need to dig deeper why it > crashed): > > # zfcp_show -n > > Local Port List: > <<>> > > [ 799.640378] Oops: 0038 ilc:3 [#1] [ 799.640387] PREEMPT SMP [ 799.640393] > > [ 799.640399] Modules linked in: nf_log_ipv6 xt_pkttype nf_log_ipv4 nf_log_common xt_LOG xt_limit ip6t_REJECT nf_reject_ipv6 xt_tcpudp nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_raw ipt_REJECT nf_reject_ipv4 iptable_raw xt_CT iptable_filter ip6table_mangle nf_conntrack_netbios_ns nf_conntrack_broadcast nf_conntrack_ipv4 nf_defrag_ipv4 ip_tables xt_conntrack nf_conntrack ip6table_filter ip6_tables x_tables ghash_s390 prng ecb aes_s390 des_s390 dm_mod des_generic sha512_s390 sha256_s390 qeth_l2 sha1_s390 qeth zfcp sha_common ccwgroup qdio autofs4 > > [ 799.640542] CPU: 1 PID: 2210 Comm: zfcp_show Not tainted 4.8.0fcbsg+ #6 > > [ 799.640550] Hardware name: IBM 2964 N96 702 (z/VM) > > [ 799.640558] task: 0000000047b60008 task.stack: 0000000062428000 > > [ 799.640567] Krnl PSW : 0404e00180000000 00000000001b125c[ 799.640581] (__lock_acquire+0x104/0x7d8) > > [ 799.640590] > > [ 799.640599] R:0 T:1 IO:0 EX:0 Key:0 M:1 W:0 P:0 AS:3 CC:2 PM:0[ 799.640618] RI:0 EA:3 > > [ 799.640621] > > [ 799.640621] Krnl GPRS: 0000000000000000 0000000000000008 07f40707c0040000 0000000000000000 > > [ 799.640624] 0000000000000000 0000000000000000 0000000000000001 0000000000000000 > > [ 799.640627] 0000000000000000 0000000000355cb4 0000000000000000 0000000047b60008 > > [ 799.640630] 0300000000000000 00000000009b17b0 000000006242b800 000000006242b778 > > [ 799.640643] Krnl Code: 00000000001b124c: b9040029 lgr %r2,%r9 > > [ 799.640648] 00000000001b1250: c0e5ffffd6a4 brasl %r14,1abf98 > > #00000000001b1256: ec28ffad007c cgij %r2,0,8,1b11b0 > > [ 799.640659] >00000000001b125c: eb012198006a asi 408(%r2,1 > > 00000000001b1262: 5830ba10 l %r3,2576(%r11) > > [ 799.640669] 00000000001b1266: 5030f0a4 st %r3,164(%r15) > > 00000000001b126a: c01000e3f9db larl %r1,1e30620 > > [ 799.640678] 00000000001b1270: e31010000012 lt %r1,0(%r1) > > [ 799.640682] > > [ 799.640684] Call Trace: > > [ 799.640687] ([] 0xffffffffffffffff) > > [ 799.640691] ([<00000000001b21f4>] lock_acquire+0x30c/0x358) > > [ 799.640699] ([<000000000099fdae>] mutex_lock_interruptible_nested+0x7e/0x4f8) > > [ 799.640717] ([<000003ff8047a090>] zfcp_fc_wka_port_get+0x40/0x128 [zfcp]) > > [ 799.640724] ([<000003ff8047bd54>] zfcp_fc_exec_bsg_job+0x244/0x2d8 [zfcp]) > > [ 799.640732] ([<00000000007c8b1e>] fc_bsg_dispatch+0x20e/0x280) > > [ 799.640739] ([<00000000006dea1a>] bsg_request_fn+0x132/0x1e0) > > [ 799.640746] ([<00000000006b8e0a>] __blk_run_queue+0x52/0x68) > > [ 799.640751] ([<00000000006c549a>] blk_execute_rq_nowait+0xf2/0x110) > > [ 799.640754] ([<00000000006c557a>] blk_execute_rq+0xa2/0x110) > > [ 799.640757] ([<00000000006de0ee>] bsg_ioctl+0x1f6/0x268) > > [ 799.640763] ([<000000000036ca20>] do_vfs_ioctl+0x680/0x6d8) > > [ 799.640767] ([<000000000036caf4>] SyS_ioctl+0x7c/0xb0) > > [ 799.640771] ([<00000000009a50de>] system_call+0xd6/0x270) > > [ 799.640774] INFO: lockdep is turned off. > > [ 799.640776] Last Breaking-Event-Address: > > [ 799.640779] [<00000000001b1244>] __lock_acquire+0xec/0x7d8 > > [ 799.640782] [ 799.640785] Kernel panic - not syncing: Fatal exception: panic_on_oops I'll have a look into it. But from a first quick glance over it I must admit I don't see the problem yet. I could imagine two reasons for it though. One being the change in the refcounting and one being the patches changing over to the fc_bsg_to{shost,rport}() helpers. I think a git bisect will help here. > > > > although the LLDD changes are purely mechanical. All they do is change from > > 'struct fc_bsg_job' to 'struct bsg_job' and corresponding changes in order > > to get the series bisectable. > > > > The idea for this change arose when discussing racy sysfs handling the FC > > bsg code with Christoph and is a next step in moving all bsg clients to > > bsg-lib to eventually clean up the in kernel bsg API. > > > > Changes to v1: > > * Reduce the number of individual patches (44 -> 16) > > nice > > > * Fix s390 build failure (forgotten to kill fc_bsg_job from zfcp_ext.h) > > I pushed your patches on today's linux.git, i.e. post v4.8 with zfcp fixes > of v4.9 merge window already included and it did build with our > default_defconfig but qdio and zfcp as modules rather than built-in. Thanks for the feedback. Johannes -- Johannes Thumshirn Storage jthumshirn@suse.de +49 911 74053 689 SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg GF: Felix Imendörffer, Jane Smithard, Graham Norton HRB 21284 (AG Nürnberg) Key fingerprint = EC38 9CAB C2C4 F25D 8600 D0D0 0393 969D 2D76 0850