From patchwork Fri Oct 30 11:44:32 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Marek_Beh=C3=BAn?= X-Patchwork-Id: 315020 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=-13.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY,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 567E1C4363A for ; Fri, 30 Oct 2020 11:44:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0169B20825 for ; Fri, 30 Oct 2020 11:44:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604058293; bh=mYokQTUy6lsno3U1tjXMofY2tBJRANrDVXM+A08CQko=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=x1zz5qOSdV3z6fycJjWCbR5+5G8JyU1cpJDzhj95OTIcgvJM94OTPMxlnwkKluMst Vnqku8Sa4FTmaZGqJeUgpPUvySl7aghJW1HX500FczcCQYASXzMQj0XN25yAMdwJl5 DiAdVnkrEt7VUOYw+0pQb/v+mZ/m0tZVKx+7XOuA= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726560AbgJ3Low (ORCPT ); Fri, 30 Oct 2020 07:44:52 -0400 Received: from mail.kernel.org ([198.145.29.99]:37388 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726530AbgJ3Low (ORCPT ); Fri, 30 Oct 2020 07:44:52 -0400 Received: from dellmb.labs.office.nic.cz (nat-1.nic.cz [217.31.205.1]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id B2447207DE; Fri, 30 Oct 2020 11:44:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604058290; bh=mYokQTUy6lsno3U1tjXMofY2tBJRANrDVXM+A08CQko=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=LuoRdXsyT3cnIewel50zEWxyxvXkdAYGgFdQPsDUVFOuouvEVsgvoNysEVWOIGo/k LdF1HWCFTcRgxSEFeV3Bz8DJnU0Ze2ZMpLcKcjzUi6EkngX4Pff9Uv3x5u8AAK93c2 /nt+twLbaZozDQXyB8yjD601juTLcSOKRkuEp0KY= From: =?utf-8?q?Marek_Beh=C3=BAn?= To: netdev@vger.kernel.org Cc: linux-leds@vger.kernel.org, Pavel Machek , Dan Murphy , Russell King , Andrew Lunn , Matthias Schiffer , "David S. Miller" , Jacek Anaszewski , Ben Whitten , =?utf-8?q?Marek_Beh=C3=BAn?= Subject: [PATCH RFC leds + net-next 4/7] leds: trigger: netdev: support HW offloading Date: Fri, 30 Oct 2020 12:44:32 +0100 Message-Id: <20201030114435.20169-5-kabel@kernel.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20201030114435.20169-1-kabel@kernel.org> References: <20201030114435.20169-1-kabel@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-leds@vger.kernel.org Add support for HW offloading of the netdev trigger. We need to change spinlock to mutex, because if spinlock is used, the trigger_offload() method cannot sleep, which can happen for ethernet PHYs. We can change the spinlock to mutex because, according to Jacek: register_netdevice_notifier() registers raw notifier chain, whose callbacks are not called from atomic context and there are no restrictions on callbacks. See include/linux/notifier.h. Move struct led_trigger_data into global include directory, into file linux/ledtrig.h, so that drivers wanting to offload the trigger can access its settings. Also export the netdev_led_trigger variable and declare it in ledtrih.h so that drivers may check whether the LED is set to this trigger. Signed-off-by: Marek Behún --- drivers/leds/trigger/ledtrig-netdev.c | 48 ++++++++++----------------- include/linux/ledtrig.h | 40 ++++++++++++++++++++++ 2 files changed, 57 insertions(+), 31 deletions(-) create mode 100644 include/linux/ledtrig.h diff --git a/drivers/leds/trigger/ledtrig-netdev.c b/drivers/leds/trigger/ledtrig-netdev.c index 8f013b6df4fa..d4fa031d3a9e 100644 --- a/drivers/leds/trigger/ledtrig-netdev.c +++ b/drivers/leds/trigger/ledtrig-netdev.c @@ -10,17 +10,16 @@ // Copyright 2005-2006 Openedhand Ltd. // Author: Richard Purdie -#include #include #include #include #include #include #include +#include #include #include #include -#include #include #include "../leds.h" @@ -36,26 +35,6 @@ * */ -struct led_netdev_data { - spinlock_t lock; - - struct delayed_work work; - struct notifier_block notifier; - - struct led_classdev *led_cdev; - struct net_device *net_dev; - - char device_name[IFNAMSIZ]; - atomic_t interval; - unsigned int last_activity; - - unsigned link:1; - unsigned tx:1; - unsigned rx:1; - - unsigned linkup:1; -}; - enum netdev_led_attr { NETDEV_ATTR_LINK, NETDEV_ATTR_TX, @@ -73,6 +52,9 @@ static void set_baseline_state(struct led_netdev_data *trigger_data) if (!led_cdev->blink_brightness) led_cdev->blink_brightness = led_cdev->max_brightness; + if (!led_trigger_offload(led_cdev)) + return; + if (!trigger_data->linkup) led_set_brightness(led_cdev, LED_OFF); else { @@ -96,9 +78,9 @@ static ssize_t device_name_show(struct device *dev, struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev); ssize_t len; - spin_lock_bh(&trigger_data->lock); + mutex_lock(&trigger_data->lock); len = sprintf(buf, "%s\n", trigger_data->device_name); - spin_unlock_bh(&trigger_data->lock); + mutex_unlock(&trigger_data->lock); return len; } @@ -114,7 +96,7 @@ static ssize_t device_name_store(struct device *dev, cancel_delayed_work_sync(&trigger_data->work); - spin_lock_bh(&trigger_data->lock); + mutex_lock(&trigger_data->lock); if (trigger_data->net_dev) { dev_put(trigger_data->net_dev); @@ -138,7 +120,7 @@ static ssize_t device_name_store(struct device *dev, trigger_data->last_activity = 0; set_baseline_state(trigger_data); - spin_unlock_bh(&trigger_data->lock); + mutex_unlock(&trigger_data->lock); return size; } @@ -295,6 +277,7 @@ static int netdev_trig_notify(struct notifier_block *nb, netdev_notifier_info_to_dev((struct netdev_notifier_info *)dv); struct led_netdev_data *trigger_data = container_of(nb, struct led_netdev_data, notifier); + bool reset = true; if (evt != NETDEV_UP && evt != NETDEV_DOWN && evt != NETDEV_CHANGE && evt != NETDEV_REGISTER && evt != NETDEV_UNREGISTER @@ -308,7 +291,7 @@ static int netdev_trig_notify(struct notifier_block *nb, cancel_delayed_work_sync(&trigger_data->work); - spin_lock_bh(&trigger_data->lock); + mutex_lock(&trigger_data->lock); trigger_data->linkup = 0; switch (evt) { @@ -327,12 +310,14 @@ static int netdev_trig_notify(struct notifier_block *nb, case NETDEV_CHANGE: if (netif_carrier_ok(dev)) trigger_data->linkup = 1; + reset = !trigger_data->led_cdev->offloaded; break; } - set_baseline_state(trigger_data); + if (reset) + set_baseline_state(trigger_data); - spin_unlock_bh(&trigger_data->lock); + mutex_unlock(&trigger_data->lock); return NOTIFY_DONE; } @@ -389,7 +374,7 @@ static int netdev_trig_activate(struct led_classdev *led_cdev) if (!trigger_data) return -ENOMEM; - spin_lock_init(&trigger_data->lock); + mutex_init(&trigger_data->lock); trigger_data->notifier.notifier_call = netdev_trig_notify; trigger_data->notifier.priority = 10; @@ -423,12 +408,13 @@ static void netdev_trig_deactivate(struct led_classdev *led_cdev) kfree(trigger_data); } -static struct led_trigger netdev_led_trigger = { +struct led_trigger netdev_led_trigger = { .name = "netdev", .activate = netdev_trig_activate, .deactivate = netdev_trig_deactivate, .groups = netdev_trig_groups, }; +EXPORT_SYMBOL_GPL(netdev_led_trigger); static int __init netdev_trig_init(void) { diff --git a/include/linux/ledtrig.h b/include/linux/ledtrig.h new file mode 100644 index 000000000000..593b2bee6ca0 --- /dev/null +++ b/include/linux/ledtrig.h @@ -0,0 +1,40 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * LED trigger shared structures + */ + +#ifndef __LINUX_LEDTRIG_H__ +#define __LINUX_LEDTRIG_H__ + +#include +#include +#include +#include + +#if IS_ENABLED(CONFIG_LEDS_TRIGGER_NETDEV) + +struct led_netdev_data { + struct mutex lock; + + struct delayed_work work; + struct notifier_block notifier; + + struct led_classdev *led_cdev; + struct net_device *net_dev; + + char device_name[IFNAMSIZ]; + atomic_t interval; + unsigned int last_activity; + + unsigned link:1; + unsigned tx:1; + unsigned rx:1; + + unsigned linkup:1; +}; + +extern struct led_trigger netdev_led_trigger; + +#endif /* IS_ENABLED(CONFIG_LEDS_TRIGGER_NETDEV) */ + +#endif /* __LINUX_LEDTRIG_H__ */