From patchwork Thu Aug 5 11:02:45 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Leon Romanovsky X-Patchwork-Id: 492705 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=-19.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT 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 5AE3BC4338F for ; Thu, 5 Aug 2021 11:02:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2B74A610CC for ; Thu, 5 Aug 2021 11:02:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240689AbhHELDH (ORCPT ); Thu, 5 Aug 2021 07:03:07 -0400 Received: from mail.kernel.org ([198.145.29.99]:55228 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240367AbhHELDF (ORCPT ); Thu, 5 Aug 2021 07:03:05 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id EBF4B610CC; Thu, 5 Aug 2021 11:02:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1628161371; bh=3YKKpJy79I8iy+2lwooi8e8r6YOet38Av4AS4cShq2w=; h=From:To:Cc:Subject:Date:From; b=GYaHU2KRE77zoc5dIptrEpaPiVDz+KPZXGfwEMriT5F5azrBQrW8NrQy0gq+Jvey2 ncRyuswvg/WGeN6onTUWN9ujnB2VCio/oXpp+o/rkMkvIdxLbxnnRAQcTDs0TA5vJ4 HILFKLqlV+2wI0yhO+bAdFwYEYvD+yh27Tw7FmV+D3T53BpasT86BR5zR8/RdOSIAB yOZCL2SCvTxXfXttwyLwCT0f/cOkp8FeCSXMgaa5rUIxi10Pcld+AvFJzSLhVAVp7Z r0Uz1XQELcdtk/qpOZBfGOCaIZxKubrNGADgMrFWLduU0KTMqpQdSCuf3u2X/R3uAP +yDnZ2cokJ1aQ== From: Leon Romanovsky To: "David S . Miller" , Jakub Kicinski Cc: Leon Romanovsky , linux-kernel@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH net-next] netdevsim: Forbid devlink reload when adding or deleting ports Date: Thu, 5 Aug 2021 14:02:45 +0300 Message-Id: <53cd1a28dd34ced9fb4c39885c6e13523e97d62c.1628161323.git.leonro@nvidia.com> X-Mailer: git-send-email 2.31.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Leon Romanovsky In order to remove complexity in devlink core related to devlink_reload_enable/disable, let's rewrite new_port/del_port logic to rely on internal to netdevsim lcok. We should protect only reload_down flow because it destroys nsim_dev, which is needed for nsim_dev_port_add/nsim_dev_port_del to hold port_list_lock. Signed-off-by: Leon Romanovsky --- drivers/net/netdevsim/bus.c | 16 ++++------------ drivers/net/netdevsim/dev.c | 7 +++++++ 2 files changed, 11 insertions(+), 12 deletions(-) diff --git a/drivers/net/netdevsim/bus.c b/drivers/net/netdevsim/bus.c index ff01e5bdc72e..a29ec264119d 100644 --- a/drivers/net/netdevsim/bus.c +++ b/drivers/net/netdevsim/bus.c @@ -183,8 +183,6 @@ new_port_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev); - struct nsim_dev *nsim_dev = dev_get_drvdata(dev); - struct devlink *devlink; unsigned int port_index; int ret; @@ -195,12 +193,10 @@ new_port_store(struct device *dev, struct device_attribute *attr, if (ret) return ret; - devlink = priv_to_devlink(nsim_dev); + if (!mutex_trylock(&nsim_bus_dev->nsim_bus_reload_lock)) + return -EBUSY; - mutex_lock(&nsim_bus_dev->nsim_bus_reload_lock); - devlink_reload_disable(devlink); ret = nsim_dev_port_add(nsim_bus_dev, NSIM_DEV_PORT_TYPE_PF, port_index); - devlink_reload_enable(devlink); mutex_unlock(&nsim_bus_dev->nsim_bus_reload_lock); return ret ? ret : count; } @@ -212,8 +208,6 @@ del_port_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev); - struct nsim_dev *nsim_dev = dev_get_drvdata(dev); - struct devlink *devlink; unsigned int port_index; int ret; @@ -224,12 +218,10 @@ del_port_store(struct device *dev, struct device_attribute *attr, if (ret) return ret; - devlink = priv_to_devlink(nsim_dev); + if (!mutex_trylock(&nsim_bus_dev->nsim_bus_reload_lock)) + return -EBUSY; - mutex_lock(&nsim_bus_dev->nsim_bus_reload_lock); - devlink_reload_disable(devlink); ret = nsim_dev_port_del(nsim_bus_dev, NSIM_DEV_PORT_TYPE_PF, port_index); - devlink_reload_enable(devlink); mutex_unlock(&nsim_bus_dev->nsim_bus_reload_lock); return ret ? ret : count; } diff --git a/drivers/net/netdevsim/dev.c b/drivers/net/netdevsim/dev.c index d538a39d4225..ff5714209b86 100644 --- a/drivers/net/netdevsim/dev.c +++ b/drivers/net/netdevsim/dev.c @@ -864,16 +864,23 @@ static int nsim_dev_reload_down(struct devlink *devlink, bool netns_change, struct netlink_ext_ack *extack) { struct nsim_dev *nsim_dev = devlink_priv(devlink); + struct nsim_bus_dev *nsim_bus_dev; + + nsim_bus_dev = nsim_dev->nsim_bus_dev; + if (!mutex_trylock(&nsim_bus_dev->nsim_bus_reload_lock)) + return -EOPNOTSUPP; if (nsim_dev->dont_allow_reload) { /* For testing purposes, user set debugfs dont_allow_reload * value to true. So forbid it. */ NL_SET_ERR_MSG_MOD(extack, "User forbid the reload for testing purposes"); + mutex_unlock(&nsim_bus_dev->nsim_bus_reload_lock); return -EOPNOTSUPP; } nsim_dev_reload_destroy(nsim_dev); + mutex_unlock(&nsim_bus_dev->nsim_bus_reload_lock); return 0; }