From patchwork Mon Mar 27 07:18:59 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shamir Rabinovitch X-Patchwork-Id: 9645423 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 146FE602D6 for ; Mon, 27 Mar 2017 07:20:00 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 06BD82832D for ; Mon, 27 Mar 2017 07:20:00 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id EF91828334; Mon, 27 Mar 2017 07:19:59 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5189B28356 for ; Mon, 27 Mar 2017 07:19:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751607AbdC0HT0 (ORCPT ); Mon, 27 Mar 2017 03:19:26 -0400 Received: from aserp1040.oracle.com ([141.146.126.69]:28541 "EHLO aserp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751406AbdC0HTZ (ORCPT ); Mon, 27 Mar 2017 03:19:25 -0400 Received: from aserv0022.oracle.com (aserv0022.oracle.com [141.146.126.234]) by aserp1040.oracle.com (Sentrion-MTA-4.3.2/Sentrion-MTA-4.3.2) with ESMTP id v2R7JBro010011 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 27 Mar 2017 07:19:12 GMT Received: from aserv0121.oracle.com (aserv0121.oracle.com [141.146.126.235]) by aserv0022.oracle.com (8.14.4/8.14.4) with ESMTP id v2R7JB5h027840 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=FAIL); Mon, 27 Mar 2017 07:19:11 GMT Received: from abhmp0001.oracle.com (abhmp0001.oracle.com [141.146.116.7]) by aserv0121.oracle.com (8.13.8/8.13.8) with ESMTP id v2R7J9UI025693; Mon, 27 Mar 2017 07:19:10 GMT Received: from shamir-net-srv.us.oracle.com (/10.211.3.248) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Mon, 27 Mar 2017 00:19:09 -0700 From: Shamir Rabinovitch To: linux-rdma@vger.kernel.org Cc: dledford@redhat.com, vijay.ac.kumar@oracle.com, shamir.rabinovitch@oracle.com Subject: [PATCH v3] IB/IPoIB: ibX: failed to create mcg debug file Date: Mon, 27 Mar 2017 03:18:59 -0400 Message-Id: <1490599139-12665-1-git-send-email-shamir.rabinovitch@oracle.com> X-Mailer: git-send-email 1.7.1 X-Source-IP: aserv0022.oracle.com [141.146.126.234] Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP When udev renames the netdev devices, ipoib debugfs entries does not get renamed. As a result, if subsequent probe of ipoib device reuse the name then creating a debugfs entry for the new device would fail. Also, moved ipoib_create_debug_files and ipoib_delete_debug_files as part of ipoib event handling in order to avoid any race condition between these. Signed-off-by: Vijay Kumar Signed-off-by: Shamir Rabinovitch --- v2->v3: - Move rev change out of commit message - Fix typo v1->v2: - Review comment from Mark Bloch Verified again and NETDEV_UNREGISTER is called correctly. Debug files are removed as expected. Thanks. - Fix compile warning when CONFIG_INFINIBAND_IPOIB_DEBUG is not set --- --- drivers/infiniband/ulp/ipoib/ipoib.h | 1 + drivers/infiniband/ulp/ipoib/ipoib_fs.c | 28 +++++++++++++++++++ drivers/infiniband/ulp/ipoib/ipoib_main.c | 41 ++++++++++++++++++++++++++-- 3 files changed, 67 insertions(+), 3 deletions(-) diff --git a/drivers/infiniband/ulp/ipoib/ipoib.h b/drivers/infiniband/ulp/ipoib/ipoib.h index da12717..95a457f 100644 --- a/drivers/infiniband/ulp/ipoib/ipoib.h +++ b/drivers/infiniband/ulp/ipoib/ipoib.h @@ -770,6 +770,7 @@ static inline void ipoib_cm_handle_tx_wc(struct net_device *dev, struct ib_wc *w void ipoib_delete_debug_files(struct net_device *dev); int ipoib_register_debugfs(void); void ipoib_unregister_debugfs(void); +void ipoib_debugfs_rename(struct net_device *dev); #else static inline void ipoib_create_debug_files(struct net_device *dev) { } static inline void ipoib_delete_debug_files(struct net_device *dev) { } diff --git a/drivers/infiniband/ulp/ipoib/ipoib_fs.c b/drivers/infiniband/ulp/ipoib/ipoib_fs.c index 6bd5740..d849b1d 100644 --- a/drivers/infiniband/ulp/ipoib/ipoib_fs.c +++ b/drivers/infiniband/ulp/ipoib/ipoib_fs.c @@ -259,6 +259,34 @@ static int ipoib_path_open(struct inode *inode, struct file *file) .release = seq_release }; +void ipoib_debugfs_rename(struct net_device *dev) +{ + struct ipoib_dev_priv *priv = netdev_priv(dev); + char name[IFNAMSIZ + sizeof "_path"]; + + if (!ipoib_root) + return; + + if (priv->mcg_dentry) { + snprintf(name, sizeof(name), "%s_mcg", dev->name); + priv->mcg_dentry = debugfs_rename(ipoib_root, priv->mcg_dentry, + ipoib_root, name); + if (!priv->mcg_dentry) + ipoib_warn(priv, "failed to rename debug file %s to %s\n", + priv->mcg_dentry->d_iname, name); + } + + if (priv->path_dentry) { + snprintf(name, sizeof(name), "%s_path", dev->name); + priv->path_dentry = debugfs_rename(ipoib_root, + priv->path_dentry, + ipoib_root, name); + if (!priv->path_dentry) + ipoib_warn(priv, "failed to rename debug file %s to %s\n", + priv->mcg_dentry->d_iname, name); + } +} + void ipoib_create_debug_files(struct net_device *dev) { struct ipoib_dev_priv *priv = netdev_priv(dev); diff --git a/drivers/infiniband/ulp/ipoib/ipoib_main.c b/drivers/infiniband/ulp/ipoib/ipoib_main.c index b58d9dc..c84b8ee 100644 --- a/drivers/infiniband/ulp/ipoib/ipoib_main.c +++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c @@ -108,6 +108,32 @@ struct ipoib_path_iter { .get_net_dev_by_params = ipoib_get_net_dev_by_params, }; +#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG +static int ipoib_netdev_event(struct notifier_block *this, + unsigned long event, void *ptr) +{ + struct netdev_notifier_info *ni = ptr; + struct net_device *dev = ni->dev; + + if (dev->netdev_ops->ndo_open != ipoib_open) + return NOTIFY_DONE; + + switch (event) { + case NETDEV_REGISTER: + ipoib_create_debug_files(dev); + break; + case NETDEV_CHANGENAME: + ipoib_debugfs_rename(dev); + break; + case NETDEV_UNREGISTER: + ipoib_delete_debug_files(dev); + break; + } + + return NOTIFY_DONE; +} +#endif + int ipoib_open(struct net_device *dev) { struct ipoib_dev_priv *priv = netdev_priv(dev); @@ -2072,8 +2098,6 @@ int ipoib_set_dev_features(struct ipoib_dev_priv *priv, struct ib_device *hca) goto register_failed; } - ipoib_create_debug_files(priv->dev); - if (ipoib_cm_add_mode_attr(priv->dev)) goto sysfs_failed; if (ipoib_add_pkey_attr(priv->dev)) @@ -2088,7 +2112,6 @@ int ipoib_set_dev_features(struct ipoib_dev_priv *priv, struct ib_device *hca) return priv->dev; sysfs_failed: - ipoib_delete_debug_files(priv->dev); unregister_netdev(priv->dev); register_failed: @@ -2173,6 +2196,12 @@ static void ipoib_remove_one(struct ib_device *device, void *client_data) kfree(dev_list); } +#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG +static struct notifier_block ipoib_netdev_notifier = { + .notifier_call = ipoib_netdev_event, +}; +#endif + static int __init ipoib_init_module(void) { int ret; @@ -2225,6 +2254,9 @@ static int __init ipoib_init_module(void) if (ret) goto err_client; +#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG + register_netdevice_notifier(&ipoib_netdev_notifier); +#endif return 0; err_client: @@ -2242,6 +2274,9 @@ static int __init ipoib_init_module(void) static void __exit ipoib_cleanup_module(void) { +#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG + unregister_netdevice_notifier(&ipoib_netdev_notifier); +#endif ipoib_netlink_fini(); ib_unregister_client(&ipoib_client); ib_sa_unregister_client(&ipoib_sa_client);