From patchwork Thu Aug 5 14:34:28 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Leon Romanovsky X-Patchwork-Id: 12421289 X-Patchwork-Delegate: kuba@kernel.org 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,URIBL_BLOCKED,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 3D802C4338F for ; Thu, 5 Aug 2021 14:34:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 20CD56113E for ; Thu, 5 Aug 2021 14:34:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242004AbhHEOet (ORCPT ); Thu, 5 Aug 2021 10:34:49 -0400 Received: from mail.kernel.org ([198.145.29.99]:52286 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240990AbhHEOer (ORCPT ); Thu, 5 Aug 2021 10:34:47 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id DE03A61151; Thu, 5 Aug 2021 14:34:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1628174073; bh=U1Y4Yp68ZDPUrh/nwHryXNZUiXlUYB4FPuNRMKgI1XY=; h=From:To:Cc:Subject:Date:From; b=Y+eu9cxSboSTokICrK77piatZ/iVv8zlsB2zPWfCZbnOsDYcpj4Wm7xpmarsDwtfU UD/MKjbyxo0mpwqdGkSrcn93mDqlce1rppmXDiqJNytS8oAFKmoa6HkgvJRlJ9mMMw 8yUkCKrpipL7nSkceWAkWSMIcThyIsPydrwZf03hqDiaF0sSd96S4rGPfstpVzM34J qKrBFY8yaldpHxbaXx/VUN8H91V38Z5s8/Vx3bD9qK9pPQ4kBt3d93icVqcCcWCmXF 6LpCBXun5KrZp9+47+kJAEOeBgpdX+kNMDlqtcelsIFCjr1nEOEc/2rjO8y0S69qHn axRAg9iI+Wm3w== 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: Protect both reload_down and reload_up paths Date: Thu, 5 Aug 2021 17:34:28 +0300 Message-Id: X-Mailer: git-send-email 2.31.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org From: Leon Romanovsky Don't progress with adding and deleting ports as long as devlink reload is running. Fixes: 23809a726c0d ("netdevsim: Forbid devlink reload when adding or deleting ports") Signed-off-by: Leon Romanovsky --- drivers/net/netdevsim/bus.c | 10 ++++++++++ drivers/net/netdevsim/dev.c | 12 +++++++++++- drivers/net/netdevsim/netdevsim.h | 1 + 3 files changed, 22 insertions(+), 1 deletion(-) diff --git a/drivers/net/netdevsim/bus.c b/drivers/net/netdevsim/bus.c index a29ec264119d..62d033a1a557 100644 --- a/drivers/net/netdevsim/bus.c +++ b/drivers/net/netdevsim/bus.c @@ -196,6 +196,11 @@ new_port_store(struct device *dev, struct device_attribute *attr, if (!mutex_trylock(&nsim_bus_dev->nsim_bus_reload_lock)) return -EBUSY; + if (nsim_bus_dev->in_reload) { + mutex_unlock(&nsim_bus_dev->nsim_bus_reload_lock); + return -EBUSY; + } + ret = nsim_dev_port_add(nsim_bus_dev, NSIM_DEV_PORT_TYPE_PF, port_index); mutex_unlock(&nsim_bus_dev->nsim_bus_reload_lock); return ret ? ret : count; @@ -221,6 +226,11 @@ del_port_store(struct device *dev, struct device_attribute *attr, if (!mutex_trylock(&nsim_bus_dev->nsim_bus_reload_lock)) return -EBUSY; + if (nsim_bus_dev->in_reload) { + mutex_unlock(&nsim_bus_dev->nsim_bus_reload_lock); + return -EBUSY; + } + ret = nsim_dev_port_del(nsim_bus_dev, NSIM_DEV_PORT_TYPE_PF, port_index); 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 ff5714209b86..53068e184c90 100644 --- a/drivers/net/netdevsim/dev.c +++ b/drivers/net/netdevsim/dev.c @@ -878,6 +878,7 @@ static int nsim_dev_reload_down(struct devlink *devlink, bool netns_change, mutex_unlock(&nsim_bus_dev->nsim_bus_reload_lock); return -EOPNOTSUPP; } + nsim_bus_dev->in_reload = true; nsim_dev_reload_destroy(nsim_dev); mutex_unlock(&nsim_bus_dev->nsim_bus_reload_lock); @@ -889,17 +890,26 @@ static int nsim_dev_reload_up(struct devlink *devlink, enum devlink_reload_actio struct netlink_ext_ack *extack) { struct nsim_dev *nsim_dev = devlink_priv(devlink); + struct nsim_bus_dev *nsim_bus_dev; + int ret; + + nsim_bus_dev = nsim_dev->nsim_bus_dev; + mutex_lock(&nsim_bus_dev->nsim_bus_reload_lock); + nsim_bus_dev->in_reload = false; if (nsim_dev->fail_reload) { /* For testing purposes, user set debugfs fail_reload * value to true. Fail right away. */ NL_SET_ERR_MSG_MOD(extack, "User setup the reload to fail for testing purposes"); + mutex_unlock(&nsim_bus_dev->nsim_bus_reload_lock); return -EINVAL; } *actions_performed = BIT(DEVLINK_RELOAD_ACTION_DRIVER_REINIT); - return nsim_dev_reload_create(nsim_dev, extack); + ret = nsim_dev_reload_create(nsim_dev, extack); + mutex_unlock(&nsim_bus_dev->nsim_bus_reload_lock); + return ret; } static int nsim_dev_info_get(struct devlink *devlink, diff --git a/drivers/net/netdevsim/netdevsim.h b/drivers/net/netdevsim/netdevsim.h index 1c20bcbd9d91..793c86dc5a9c 100644 --- a/drivers/net/netdevsim/netdevsim.h +++ b/drivers/net/netdevsim/netdevsim.h @@ -362,6 +362,7 @@ struct nsim_bus_dev { struct nsim_vf_config *vfconfigs; /* Lock for devlink->reload_enabled in netdevsim module */ struct mutex nsim_bus_reload_lock; + bool in_reload; bool init; };