From: "Liuyixian (Eason)" <liuyixian@huawei.com>
To: Jason Gunthorpe <jgg@ziepe.ca>
Cc: <dledford@redhat.com>, <leon@kernel.org>,
<linux-rdma@vger.kernel.org>, <linuxarm@huawei.com>
Subject: Re: [PATCH v5 for-next 1/2] RDMA/hns: Add the workqueue framework for flush cqe handler
Date: Mon, 13 Jan 2020 19:26:45 +0800 [thread overview]
Message-ID: <65fb928c-5f85-02f9-c5ac-06037b3fe967@huawei.com> (raw)
In-Reply-To: <20200110152602.GC8765@ziepe.ca>
On 2020/1/10 23:26, Jason Gunthorpe wrote:
> On Sat, Dec 28, 2019 at 11:28:54AM +0800, Yixian Liu wrote:
>> +void init_flush_work(struct hns_roce_dev *hr_dev, struct hns_roce_qp *hr_qp)
>> +{
>> + struct hns_roce_work *flush_work;
>> +
>> + flush_work = kzalloc(sizeof(struct hns_roce_work), GFP_ATOMIC);
>> + if (!flush_work)
>> + return;
>
> You changed it to only queue once, so why do we need the allocation
> now? That was the whole point..
Hi Jason,
The flush work is queued **not only once**. As the flag being_pushed is set to 0 during
the process of modifying qp like this:
hns_roce_v2_modify_qp {
...
if (new_state == IB_QPS_ERR) {
spin_lock_irqsave(&hr_qp->sq.lock, sq_flag);
...
hr_qp->state = IB_QPS_ERR;
hr_qp->being_push = 0;
...
}
...
}
which means the new updated PI value needs to be updated with initializing a new flush work.
Thus, maybe there are two flush work in the workqueue. Thus, we still need the allocation here.
>
> And the other patch shouldn't be manipulating being_pushed without
> some kind of locking
Agree. It needs to hold the spin lock of sq and rq when updating it in modify qp,
will fix next version.
>
> Jason
>
>
next prev parent reply other threads:[~2020-01-13 11:26 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-28 3:28 [PATCH v5 for-next 0/2] RDMA/hns: Add the workqueue framework for flush cqe handler Yixian Liu
2019-12-28 3:28 ` [PATCH v5 for-next 1/2] " Yixian Liu
2020-01-10 15:26 ` Jason Gunthorpe
2020-01-11 9:49 ` Liuyixian (Eason)
2020-01-13 11:26 ` Liuyixian (Eason) [this message]
2020-01-13 14:04 ` Jason Gunthorpe
2020-01-15 9:36 ` Liuyixian (Eason)
2020-01-15 9:39 ` Liuyixian (Eason)
2019-12-28 3:28 ` [PATCH v5 for-next 2/2] RDMA/hns: Delayed flush cqe process with workqueue Yixian Liu
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