From patchwork Fri Apr 26 10:00:42 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jijie Shao X-Patchwork-Id: 13644553 X-Patchwork-Delegate: kuba@kernel.org Received: from szxga02-in.huawei.com (szxga02-in.huawei.com [45.249.212.188]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EC09B142E9F; Fri, 26 Apr 2024 10:15:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.188 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1714126531; cv=none; b=G7WSoKiTg2MKZLxjQFoE/LDERAsqihONwc2h1mCa6w41zJLMBtWRz00XHXoFae2A/aab659jigq5oeXpu06gWSEuHacc1A1l5vsT9/hrixprqMM1JxiY/9pI2ls4VEg7yqv6ePER3yYnV4nl6SS3E8caeTe62/V1W+bCfLdJNEE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1714126531; c=relaxed/simple; bh=1PmetgDd52wT5mS6a1c+oHTd+cEgcFwQ5z45836SnVQ=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=n574oaeeXB2izpRRCAiemcX+60b6ULylSrS+cIjwfWrX0KX5kkb6H2gpHC3I2CQ1TdYxZqABB/UH8PlMUGFKqkLRM8TZ4wy35oRHeITiI7tsl92Qg6Cc+ZatDL+j22zrcXn5dFdZp/W/Kf1npot+t3SVq1EdrzyezhZGvrbYA74= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com; spf=pass smtp.mailfrom=huawei.com; arc=none smtp.client-ip=45.249.212.188 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huawei.com Received: from mail.maildlp.com (unknown [172.19.162.254]) by szxga02-in.huawei.com (SkyGuard) with ESMTP id 4VQpRZ0tmQzXmxq; Fri, 26 Apr 2024 18:11:54 +0800 (CST) Received: from kwepemm600007.china.huawei.com (unknown [7.193.23.208]) by mail.maildlp.com (Postfix) with ESMTPS id 8F98418009D; Fri, 26 Apr 2024 18:15:26 +0800 (CST) Received: from localhost.localdomain (10.50.165.33) by kwepemm600007.china.huawei.com (7.193.23.208) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2507.35; Fri, 26 Apr 2024 18:15:21 +0800 From: Jijie Shao To: , , , , , , CC: , , , , , , Subject: [PATCH V2 net 4/7] net: hns3: use appropriate barrier function after setting a bit value Date: Fri, 26 Apr 2024 18:00:42 +0800 Message-ID: <20240426100045.1631295-5-shaojijie@huawei.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20240426100045.1631295-1-shaojijie@huawei.com> References: <20240426100045.1631295-1-shaojijie@huawei.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: dggems701-chm.china.huawei.com (10.3.19.178) To kwepemm600007.china.huawei.com (7.193.23.208) X-Patchwork-Delegate: kuba@kernel.org From: Peiyang Wang There is a memory barrier in followed case. When set the port down, hclgevf_set_timmer will set DOWN in state. Meanwhile, the service task has different behaviour based on whether the state is DOWN. Thus, to make sure service task see DOWN, use smp_mb__after_atomic after calling set_bit(). CPU0 CPU1 ========================== =================================== hclgevf_set_timer_task() hclgevf_periodic_service_task() set_bit(DOWN,state) test_bit(DOWN,state) pf also has this issue. Fixes: ff200099d271 ("net: hns3: remove unnecessary work in hclgevf_main") Fixes: 1c6dfe6fc6f7 ("net: hns3: remove mailbox and reset work in hclge_main") Signed-off-by: Peiyang Wang Signed-off-by: Jijie Shao Reviewed-by: Simon Horman --- drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c | 3 +-- drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c | 3 +-- 2 files changed, 2 insertions(+), 4 deletions(-) diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c index a068cd745eb4..6eda73f1e6ad 100644 --- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c +++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c @@ -7954,8 +7954,7 @@ static void hclge_set_timer_task(struct hnae3_handle *handle, bool enable) /* Set the DOWN flag here to disable link updating */ set_bit(HCLGE_STATE_DOWN, &hdev->state); - /* flush memory to make sure DOWN is seen by service task */ - smp_mb__before_atomic(); + smp_mb__after_atomic(); /* flush memory to make sure DOWN is seen by service task */ hclge_flush_link_update(hdev); } } diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c b/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c index b57111252d07..08db8e84be4e 100644 --- a/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c +++ b/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c @@ -2181,8 +2181,7 @@ static void hclgevf_set_timer_task(struct hnae3_handle *handle, bool enable) } else { set_bit(HCLGEVF_STATE_DOWN, &hdev->state); - /* flush memory to make sure DOWN is seen by service task */ - smp_mb__before_atomic(); + smp_mb__after_atomic(); /* flush memory to make sure DOWN is seen by service task */ hclgevf_flush_link_update(hdev); } }