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RDMA/hns: Fix flush cqe error when racing with destroy qp

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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: ffd541d457 ("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>
Link: https://patch.msgid.link/20241024124000.2931869-3-huangjunxian6@hisilicon.com
Reviewed-by: Zhu Yanjun <yanjun.zhu@linux.dev>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
This commit is contained in:
wenglianfa 2024-10-24 20:39:57 +08:00 committed by Leon Romanovsky
parent 571e4ab8a4
commit 377a209770
3 changed files with 22 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/infiniband/hw/hns/hns_roce_device.h
View File

@ -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 {

7
drivers/infiniband/hw/hns/hns_roce_hw_v2.c
View File

@ -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,

15
drivers/infiniband/hw/hns/hns_roce_qp.c
View File

@ -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;