From: Gal Pressman <galpress@amazon.com>
To: liweihang <liweihang@huawei.com>,
"linux-rdma@vger.kernel.org" <linux-rdma@vger.kernel.org>
Cc: Linuxarm <linuxarm@huawei.com>
Subject: Re: Question about IB_QP_CUR_STATE
Date: Wed, 8 Jul 2020 15:42:34 +0300 [thread overview]
Message-ID: <881488e6-03d8-1e01-076c-5c901d84a44a@amazon.com> (raw)
In-Reply-To: <876ca1eb8667461a9d2e0effb8ee3934@huawei.com>
On 08/07/2020 12:41, liweihang wrote:
> Hi all,
>
> I'm a little confused about the role of IB_QP_CUR_STATE in the enumeration
> ib_qp_attr_mask.
>
> In manual page of ibv_modify_qp(), comments of cur_qp_state is "Assume this
> is the current QP state". Why we need to get current qp state from users
> instead of drivers?
>
> For example, why the users are allowed to modify qp from RTR to RTS again
> even if the qp's state in driver and hardware has already been RTS.
>
> I would be appretiate it if someone can help with this.
>
> Weihang
>
Talking about IB_QP_CUR_STATE, I see many drivers filling it in their query QP
callback although it should only be used in modify operations.. Is there a
reason not to remove it?
next prev parent reply other threads:[~2020-07-08 12:42 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-08 9:41 Question about IB_QP_CUR_STATE liweihang
2020-07-08 12:20 ` Leon Romanovsky
2020-07-08 12:42 ` Gal Pressman [this message]
2020-07-08 15:44 ` Leon Romanovsky
2020-07-09 6:13 ` Gal Pressman
2020-07-10 10:11 ` liweihang
2020-07-12 10:44 ` Leon Romanovsky
2020-07-12 10:53 ` Gal Pressman
2020-07-12 11:01 ` Leon Romanovsky
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