From nobody Tue Nov 26 04:37:39 2024 Received: from szxga01-in.huawei.com (szxga01-in.huawei.com [45.249.212.187]) (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 A00A919D06E; Tue, 22 Oct 2024 11:16:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.187 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729595801; cv=none; b=Hcu+tOjkpm3INEgSmLoUZGp3Nlhp2GPMQ8LtwnWUEDYaePLs597G6IWBkImOGRows68CqO9bnHCxcPBuVmCFNKsZ9RAs3qCWFFe51tvkUU4p0AoI/Ekd4+5mOZpEN2Lp1Y2naOGvJ1cleettOF3/NKB31e68Yim3m0in0xROBMU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729595801; c=relaxed/simple; bh=Pn7Y/iVUgpru4asH9jpIpWBrH8bp0qSMphbIyViKTCg=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=Hf5h38Od92bPNGf3hDoVjwYa5t123lH0jMdxIQZj/De2hfXtsPr9yf3twTkDKcf0uJ0omd9np6gjW2UA6dyH1L5m2gorHwpnaJ/DgvhQJsXpDu8CHsxklR7lbLR862zworgvw9Jme9esqZ6n1MnUyJB5ZtTVRMzpimAD1O6qbKs= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=hisilicon.com; spf=pass smtp.mailfrom=hisilicon.com; arc=none smtp.client-ip=45.249.212.187 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=hisilicon.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=hisilicon.com Received: from mail.maildlp.com (unknown [172.19.163.252]) by szxga01-in.huawei.com (SkyGuard) with ESMTP id 4XXqMB6bdsz10N3d; Tue, 22 Oct 2024 19:14:30 +0800 (CST) Received: from kwepemf100018.china.huawei.com (unknown [7.202.181.17]) by mail.maildlp.com (Postfix) with ESMTPS id 901301800DB; Tue, 22 Oct 2024 19:16:31 +0800 (CST) Received: from localhost.localdomain (10.90.30.45) by kwepemf100018.china.huawei.com (7.202.181.17) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.11; Tue, 22 Oct 2024 19:16:31 +0800 From: Junxian Huang To: , CC: , , , , Subject: [PATCH for-rc 2/5] RDMA/hns: Fix flush cqe error when racing with destroy qp Date: Tue, 22 Oct 2024 19:10:14 +0800 Message-ID: <20241022111017.946170-3-huangjunxian6@hisilicon.com> X-Mailer: git-send-email 2.30.0 In-Reply-To: <20241022111017.946170-1-huangjunxian6@hisilicon.com> References: <20241022111017.946170-1-huangjunxian6@hisilicon.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: dggems703-chm.china.huawei.com (10.3.19.180) To kwepemf100018.china.huawei.com (7.202.181.17) Content-Type: text/plain; charset="utf-8" From: wenglianfa QP needs to be modified to IB_QPS_ERROR to trigger HW flush cqe. But when this process races with destroy qp, the destroy-qp process may modify the QP to IB_QPS_RESET first. In this case flush cqe will fail since it is invalid to modify qp from IB_QPS_RESET to IB_QPS_ERROR. Add lock and bit flag to make sure pending flush cqe work is completed first and no more new works will be added. Fixes: ffd541d45726 ("RDMA/hns: Add the workqueue framework for flush cqe h= andler") Signed-off-by: wenglianfa Signed-off-by: Junxian Huang --- drivers/infiniband/hw/hns/hns_roce_device.h | 2 ++ drivers/infiniband/hw/hns/hns_roce_hw_v2.c | 7 +++++++ drivers/infiniband/hw/hns/hns_roce_qp.c | 14 ++++++++++++-- 3 files changed, 21 insertions(+), 2 deletions(-) diff --git a/drivers/infiniband/hw/hns/hns_roce_device.h b/drivers/infiniba= nd/hw/hns/hns_roce_device.h index 73c78005901e..9b51d5a1533f 100644 --- a/drivers/infiniband/hw/hns/hns_roce_device.h +++ b/drivers/infiniband/hw/hns/hns_roce_device.h @@ -593,6 +593,7 @@ struct hns_roce_dev; =20 enum { HNS_ROCE_FLUSH_FLAG =3D 0, + HNS_ROCE_STOP_FLUSH_FLAG =3D 1, }; =20 struct hns_roce_work { @@ -656,6 +657,7 @@ struct hns_roce_qp { enum hns_roce_cong_type cong_type; u8 tc_mode; u8 priority; + spinlock_t flush_lock; }; =20 struct hns_roce_ib_iboe { diff --git a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c b/drivers/infiniban= d/hw/hns/hns_roce_hw_v2.c index e85c450e1809..aa42c5a9b254 100644 --- a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c +++ b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c @@ -5598,8 +5598,15 @@ int hns_roce_v2_destroy_qp(struct ib_qp *ibqp, struc= t ib_udata *udata) { struct hns_roce_dev *hr_dev =3D to_hr_dev(ibqp->device); struct hns_roce_qp *hr_qp =3D to_hr_qp(ibqp); + unsigned long flags; int ret; =20 + /* Make sure flush_cqe() is completed */ + spin_lock_irqsave(&hr_qp->flush_lock, flags); + set_bit(HNS_ROCE_STOP_FLUSH_FLAG, &hr_qp->flush_flag); + spin_unlock_irqrestore(&hr_qp->flush_lock, flags); + flush_work(&hr_qp->flush_work.work); + ret =3D hns_roce_v2_destroy_qp_common(hr_dev, hr_qp, udata); if (ret) ibdev_err(&hr_dev->ib_dev, diff --git a/drivers/infiniband/hw/hns/hns_roce_qp.c b/drivers/infiniband/h= w/hns/hns_roce_qp.c index dcaa370d4a26..3439312b0138 100644 --- a/drivers/infiniband/hw/hns/hns_roce_qp.c +++ b/drivers/infiniband/hw/hns/hns_roce_qp.c @@ -90,11 +90,18 @@ static void flush_work_handle(struct work_struct *work) void init_flush_work(struct hns_roce_dev *hr_dev, struct hns_roce_qp *hr_q= p) { struct hns_roce_work *flush_work =3D &hr_qp->flush_work; + unsigned long flags; + + spin_lock_irqsave(&hr_qp->flush_lock, flags); + /* Exit directly after destroy_qp() */ + if (test_bit(HNS_ROCE_STOP_FLUSH_FLAG, &hr_qp->flush_flag)) { + spin_unlock_irqrestore(&hr_qp->flush_lock, flags); + return; + } =20 - flush_work->hr_dev =3D hr_dev; - INIT_WORK(&flush_work->work, flush_work_handle); refcount_inc(&hr_qp->refcount); queue_work(hr_dev->irq_workq, &flush_work->work); + spin_unlock_irqrestore(&hr_qp->flush_lock, flags); } =20 void flush_cqe(struct hns_roce_dev *dev, struct hns_roce_qp *qp) @@ -1140,6 +1147,7 @@ static int hns_roce_create_qp_common(struct hns_roce_= dev *hr_dev, struct ib_udata *udata, struct hns_roce_qp *hr_qp) { + struct hns_roce_work *flush_work =3D &hr_qp->flush_work; struct hns_roce_ib_create_qp_resp resp =3D {}; struct ib_device *ibdev =3D &hr_dev->ib_dev; struct hns_roce_ib_create_qp ucmd =3D {}; @@ -1151,6 +1159,8 @@ static int hns_roce_create_qp_common(struct hns_roce_= dev *hr_dev, =20 hr_qp->state =3D IB_QPS_RESET; hr_qp->flush_flag =3D 0; + flush_work->hr_dev =3D hr_dev; + INIT_WORK(&flush_work->work, flush_work_handle); =20 if (init_attr->create_flags) return -EOPNOTSUPP; --=20 2.33.0