From mboxrd@z Thu Jan 1 00:00:00 1970 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=-12.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,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 AF1C4C433E2 for ; Tue, 8 Sep 2020 21:18:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7A9A320768 for ; Tue, 8 Sep 2020 21:18:12 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=nbd.name header.i=@nbd.name header.b="gUq+k0zm" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730189AbgIHVSL (ORCPT ); Tue, 8 Sep 2020 17:18:11 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48534 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730145AbgIHVSE (ORCPT ); Tue, 8 Sep 2020 17:18:04 -0400 Received: from nbd.name (nbd.name [IPv6:2a01:4f8:221:3d45::2]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E3996C061756 for ; Tue, 8 Sep 2020 14:18:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=nbd.name; s=20160729; h=Content-Transfer-Encoding:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:To:From:Sender:Reply-To:Cc:Content-Type:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Id:List-Help:List-Unsubscribe:List-Subscribe: List-Post:List-Owner:List-Archive; bh=qQplBoS+uux1QSeLr2sU6wTnhqBYSuUtXS7dh7l4fLw=; b=gUq+k0zms5SkcrKmWF/tFre0Df BK2e8fD1iNWtZgqHrVArUvLYnpEwM58AG7UTeuhO7AQLRbSwglqy1ijn48C7Qj0sBVAsihoGHbDmr v4VAWa5bIyHSUKgbbaubCf6vSj/U5BY8+E8rYxtOM2RMbknC9bWRh2DZ8nIS8u0Jkf4U=; Received: from p4ff13fcb.dip0.t-ipconnect.de ([79.241.63.203] helo=localhost.localdomain) by ds12 with esmtpsa (TLS1.2:ECDHE_RSA_AES_128_CBC_SHA1:128) (Exim 4.89) (envelope-from ) id 1kFl02-0002Cx-N5 for linux-wireless@vger.kernel.org; Tue, 08 Sep 2020 23:17:58 +0200 From: Felix Fietkau To: linux-wireless@vger.kernel.org Subject: [PATCH 04/11] mt76: add utility functions for deferring work to a kernel thread Date: Tue, 8 Sep 2020 23:17:49 +0200 Message-Id: <20200908211756.15998-4-nbd@nbd.name> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200908211756.15998-1-nbd@nbd.name> References: <20200908211756.15998-1-nbd@nbd.name> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-wireless-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org In order to avoid keeping work like tx scheduling pinned to the CPU it was scheduled from, it makes sense to switch from tasklets to kernel threads. Signed-off-by: Felix Fietkau --- drivers/net/wireless/mediatek/mt76/util.c | 28 +++++++++ drivers/net/wireless/mediatek/mt76/util.h | 76 +++++++++++++++++++++++ 2 files changed, 104 insertions(+) diff --git a/drivers/net/wireless/mediatek/mt76/util.c b/drivers/net/wireless/mediatek/mt76/util.c index f53bb4ae5001..581964425468 100644 --- a/drivers/net/wireless/mediatek/mt76/util.c +++ b/drivers/net/wireless/mediatek/mt76/util.c @@ -110,4 +110,32 @@ int mt76_get_min_avg_rssi(struct mt76_dev *dev, bool ext_phy) } EXPORT_SYMBOL_GPL(mt76_get_min_avg_rssi); +int __mt76_worker_fn(void *ptr) +{ + struct mt76_worker *w = ptr; + + while (!kthread_should_stop()) { + set_current_state(TASK_INTERRUPTIBLE); + + if (kthread_should_park()) { + kthread_parkme(); + continue; + } + + if (!test_and_clear_bit(MT76_WORKER_SCHEDULED, &w->state)) { + schedule(); + continue; + } + + set_bit(MT76_WORKER_RUNNING, &w->state); + set_current_state(TASK_RUNNING); + w->fn(w); + cond_resched(); + clear_bit(MT76_WORKER_RUNNING, &w->state); + } + + return 0; +} +EXPORT_SYMBOL_GPL(__mt76_worker_fn); + MODULE_LICENSE("Dual BSD/GPL"); diff --git a/drivers/net/wireless/mediatek/mt76/util.h b/drivers/net/wireless/mediatek/mt76/util.h index fd1a68820e0a..1c363ea9ab9c 100644 --- a/drivers/net/wireless/mediatek/mt76/util.h +++ b/drivers/net/wireless/mediatek/mt76/util.h @@ -10,6 +10,19 @@ #include #include #include +#include + +struct mt76_worker +{ + struct task_struct *task; + void (*fn)(struct mt76_worker *); + unsigned long state; +}; + +enum { + MT76_WORKER_SCHEDULED, + MT76_WORKER_RUNNING, +}; #define MT76_INCR(_var, _size) \ (_var = (((_var) + 1) % (_size))) @@ -45,4 +58,67 @@ mt76_skb_set_moredata(struct sk_buff *skb, bool enable) hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_MOREDATA); } +int __mt76_worker_fn(void *ptr); + +static inline int +mt76_worker_setup(struct ieee80211_hw *hw, struct mt76_worker *w, + void (*fn)(struct mt76_worker *), + const char *name) +{ + const char *dev_name = wiphy_name(hw->wiphy); + int ret; + + if (fn) + w->fn = fn; + w->task = kthread_create(__mt76_worker_fn, w, "mt76-%s %s", + name, dev_name); + + ret = PTR_ERR_OR_ZERO(w->task); + if (ret) { + w->task = NULL; + return ret; + } + + wake_up_process(w->task); + + return 0; +} + +static inline void mt76_worker_schedule(struct mt76_worker *w) +{ + if (!w->task) + return; + + if (!test_and_set_bit(MT76_WORKER_SCHEDULED, &w->state) && + !test_bit(MT76_WORKER_RUNNING, &w->state)) + wake_up_process(w->task); +} + +static inline void mt76_worker_disable(struct mt76_worker *w) +{ + if (!w->task) + return; + + kthread_park(w->task); + WRITE_ONCE(w->state, 0); +} + +static inline void mt76_worker_enable(struct mt76_worker *w) +{ + if (!w->task) + return; + + kthread_unpark(w->task); + mt76_worker_schedule(w); +} + +static inline void mt76_worker_teardown(struct mt76_worker *w) +{ + if (!w->task) + return; + + kthread_stop(w->task); + w->task = NULL; +} + #endif -- 2.28.0