From patchwork Mon Nov 5 07:04:47 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Stojaczyk, Dariusz" X-Patchwork-Id: 47801 X-Patchwork-Delegate: thomas@monjalon.net Return-Path: X-Original-To: patchwork@dpdk.org Delivered-To: patchwork@dpdk.org Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id B14FE5424; Mon, 5 Nov 2018 08:08:18 +0100 (CET) Received: from mga12.intel.com (mga12.intel.com [192.55.52.136]) by dpdk.org (Postfix) with ESMTP id C7D394CA2 for ; Mon, 5 Nov 2018 08:08:14 +0100 (CET) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga106.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 04 Nov 2018 23:08:13 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.54,467,1534834800"; d="scan'208";a="105308435" Received: from violet.igk.intel.com ([10.102.54.137]) by fmsmga001.fm.intel.com with ESMTP; 04 Nov 2018 23:08:12 -0800 From: Darek Stojaczyk To: dev@dpdk.org Cc: thomas@monjalon.net, Darek Stojaczyk , gaetan.rivet@6wind.com, qi.z.zhang@intel.com Date: Mon, 5 Nov 2018 08:04:47 +0100 Message-Id: <20181105070447.67700-3-dariusz.stojaczyk@intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20181105070447.67700-1-dariusz.stojaczyk@intel.com> References: <20181105070447.67700-1-dariusz.stojaczyk@intel.com> Subject: [dpdk-dev] [PATCH 3/3] eal: handle bus rescan failures during hotplug X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" Fixes for devargs dangling pointers and various segfaults caused by failed hotplug requests. If rescan failed, we have one the following scenarios to cover: a) the device was never scanned at all; the devargs that were just allocated are not referenced anywhere and can be removed straight away. Previous devargs (if any) need to be re-inserted as they are still in use. b) the device was scanned before, but the rescan failed before it reached our device, meaning that its devargs were not overridden and we can remove our newly allocated ones. Previous devargs need to be re-inserted. c) we managed to rescan our device and only failed on something after that, which means we have to free the memory of previous devargs and stick with the new ones, despite the fact that the hotplug still needs to be failed. Fixes: 7e8b26650146 ("eal: fix hotplug add / remove") Cc: gaetan.rivet@6wind.com Cc: qi.z.zhang@intel.com Signed-off-by: Darek Stojaczyk --- lib/librte_eal/common/eal_common_dev.c | 30 ++++++++++++++++++-------- 1 file changed, 21 insertions(+), 9 deletions(-) diff --git a/lib/librte_eal/common/eal_common_dev.c b/lib/librte_eal/common/eal_common_dev.c index 4cb424df1..b090295b9 100644 --- a/lib/librte_eal/common/eal_common_dev.c +++ b/lib/librte_eal/common/eal_common_dev.c @@ -7,6 +7,7 @@ #include #include #include +#include #include #include @@ -141,32 +142,33 @@ local_dev_probe(const char *devargs, struct rte_device **new_dev) ret = rte_devargs_parse(da, devargs); if (ret) - goto err_devarg; + goto err_remove_devargs; if (da->bus->plug == NULL) { RTE_LOG(ERR, EAL, "Function plug not supported by bus (%s)\n", da->bus->name); ret = -ENOTSUP; - goto err_devarg; + goto err_remove_devargs; } rte_devargs_insert(da, &prev_da); + ret = da->bus->scan(); + if (ret) + goto err_rollback_devargs; + if (prev_da != NULL) { free(prev_da->args); free(prev_da); + prev_da = NULL; } - ret = da->bus->scan(); - if (ret) - goto err_devarg; - dev = da->bus->find_device(NULL, cmp_dev_name, da->name); if (dev == NULL) { RTE_LOG(ERR, EAL, "Cannot find device (%s)\n", da->name); ret = -ENODEV; - goto err_devarg; + goto err_remove_devargs; } ret = dev->bus->plug(dev); @@ -175,13 +177,23 @@ local_dev_probe(const char *devargs, struct rte_device **new_dev) return ret; /* no rollback */ RTE_LOG(ERR, EAL, "Driver cannot attach the device (%s)\n", dev->name); - goto err_devarg; + goto err_remove_devargs; } *new_dev = dev; return 0; -err_devarg: +err_rollback_devargs: + dev = da->bus->find_device(NULL, cmp_dev_name, da->name); + if (prev_da != NULL && (dev == NULL || dev->devargs != da)) { + /* either the device wasn't scanned, or we didn't + * manage yet to update its devargs. + */ + rte_devargs_insert(prev_da, &da); + assert(da != NULL); + } + +err_remove_devargs: if (rte_devargs_remove(da) != 0) { free(da->args); free(da);