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[PATCH v2 for-rc 2/5] RDMA/hns: Fix flush cqe error when racing with destroy qp

Junxian Huang posted 5 patches 1 month ago
[PATCH v2 for-rc 2/5] RDMA/hns: Fix flush cqe error when racing with destroy qp
Posted by Junxian Huang 1 month ago 
From: wenglianfa <wenglianfa@huawei.com>

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 handler")
Signed-off-by: wenglianfa <wenglianfa@huawei.com>
Signed-off-by: Junxian Huang <huangjunxian6@hisilicon.com>
---
 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     | 15 +++++++++++++--
 3 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/drivers/infiniband/hw/hns/hns_roce_device.h b/drivers/infiniband/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;
 
 enum {
 	HNS_ROCE_FLUSH_FLAG = 0,
+	HNS_ROCE_STOP_FLUSH_FLAG = 1,
 };
 
 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;
 };
 
 struct hns_roce_ib_iboe {
diff --git a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c b/drivers/infiniband/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, struct ib_udata *udata)
 {
 	struct hns_roce_dev *hr_dev = to_hr_dev(ibqp->device);
 	struct hns_roce_qp *hr_qp = to_hr_qp(ibqp);
+	unsigned long flags;
 	int ret;
 
+	/* 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 = 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/hw/hns/hns_roce_qp.c
index dcaa370d4a26..2ad03ecdbf8e 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_qp)
 {
 	struct hns_roce_work *flush_work = &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;
+	}
 
-	flush_work->hr_dev = 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);
 }
 
 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 = &hr_qp->flush_work;
 	struct hns_roce_ib_create_qp_resp resp = {};
 	struct ib_device *ibdev = &hr_dev->ib_dev;
 	struct hns_roce_ib_create_qp ucmd = {};
@@ -1148,9 +1156,12 @@ static int hns_roce_create_qp_common(struct hns_roce_dev *hr_dev,
 	mutex_init(&hr_qp->mutex);
 	spin_lock_init(&hr_qp->sq.lock);
 	spin_lock_init(&hr_qp->rq.lock);
+	spin_lock_init(&hr_qp->flush_lock);
 
 	hr_qp->state = IB_QPS_RESET;
 	hr_qp->flush_flag = 0;
+	flush_work->hr_dev = hr_dev;
+	INIT_WORK(&flush_work->work, flush_work_handle);
 
 	if (init_attr->create_flags)
 		return -EOPNOTSUPP;
-- 
2.33.0
Re: [PATCH v2 for-rc 2/5] RDMA/hns: Fix flush cqe error when racing with destroy qp
Posted by Zhu Yanjun 1 month ago 
在 2024/10/24 14:39, Junxian Huang 写道:
> From: wenglianfa <wenglianfa@huawei.com>
> 
> 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 handler")
> Signed-off-by: wenglianfa <wenglianfa@huawei.com>
> Signed-off-by: Junxian Huang <huangjunxian6@hisilicon.com>
> ---
>   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     | 15 +++++++++++++--
>   3 files changed, 22 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/infiniband/hw/hns/hns_roce_device.h b/drivers/infiniband/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;
>   
>   enum {
>   	HNS_ROCE_FLUSH_FLAG = 0,
> +	HNS_ROCE_STOP_FLUSH_FLAG = 1,
>   };
>   
>   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;
>   };
>   
>   struct hns_roce_ib_iboe {
> diff --git a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c b/drivers/infiniband/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, struct ib_udata *udata)
>   {
>   	struct hns_roce_dev *hr_dev = to_hr_dev(ibqp->device);
>   	struct hns_roce_qp *hr_qp = to_hr_qp(ibqp);
> +	unsigned long flags;
>   	int ret;
>   
> +	/* 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 = 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/hw/hns/hns_roce_qp.c
> index dcaa370d4a26..2ad03ecdbf8e 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_qp)
>   {
>   	struct hns_roce_work *flush_work = &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;
> +	}
>   
> -	flush_work->hr_dev = 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);
>   }
>   
>   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 = &hr_qp->flush_work;
>   	struct hns_roce_ib_create_qp_resp resp = {};
>   	struct ib_device *ibdev = &hr_dev->ib_dev;
>   	struct hns_roce_ib_create_qp ucmd = {};
> @@ -1148,9 +1156,12 @@ static int hns_roce_create_qp_common(struct hns_roce_dev *hr_dev,
>   	mutex_init(&hr_qp->mutex);
>   	spin_lock_init(&hr_qp->sq.lock);
>   	spin_lock_init(&hr_qp->rq.lock);
> +	spin_lock_init(&hr_qp->flush_lock);

Thanks a lot. I am fine with this spin_lock_init(&hr_qp->flush_lock);
Reviewed-by: Zhu Yanjun <yanjun.zhu@linux.dev>

Zhu Yanjun

>   
>   	hr_qp->state = IB_QPS_RESET;
>   	hr_qp->flush_flag = 0;
> +	flush_work->hr_dev = hr_dev;
> +	INIT_WORK(&flush_work->work, flush_work_handle);
>   
>   	if (init_attr->create_flags)
>   		return -EOPNOTSUPP;

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