linux-kernel - Re: [PATCH] RDMA/mlx5: return the EFAULT per ibv_advise

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Date:   Mon, 16 Aug 2021 02:59:27 +0000
From:   "lizhijian@...itsu.com" <lizhijian@...itsu.com>
To:     Leon Romanovsky <leon@...nel.org>, Jason Gunthorpe <jgg@...dia.com>
CC:     "lizhijian@...itsu.com" <lizhijian@...itsu.com>,
        "dledford@...hat.com" <dledford@...hat.com>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] RDMA/mlx5: return the EFAULT per ibv_advise_mr(3)



On 05/08/2021 14:43, Leon Romanovsky wrote:
> On Wed, Aug 04, 2021 at 03:50:22PM -0300, Jason Gunthorpe wrote:
>> On Wed, Aug 04, 2021 at 08:35:30AM +0300, Leon Romanovsky wrote:
>>> On Tue, Aug 03, 2021 at 03:13:41PM -0300, Jason Gunthorpe wrote:
>>>> On Tue, Aug 03, 2021 at 08:56:54PM +0300, Leon Romanovsky wrote:
>>>>> On Tue, Aug 03, 2021 at 01:25:07PM -0300, Jason Gunthorpe wrote:
>>>>>> On Sun, Aug 01, 2021 at 05:20:50PM +0800, Li Zhijian wrote:
>>>>>>> ibv_advise_mr(3) says:
>>>>>>> EFAULT In one of the following: o When the range requested is out of the  MR  bounds,
>>>>>>>         or  when  parts of it are not part of the process address space. o One of the
>>>>>>>         lkeys provided in the scatter gather list is invalid or with wrong write access
>>>>>>>
>>>>>>> Actually get_prefetchable_mr() will return NULL if it see above conditions
>>>>>> No, get_prefetchable_mr() returns NULL if the mkey is invalid
>>>>> And what is this?
>>>>>    1701 static struct mlx5_ib_mr *
>>>>>    1702 get_prefetchable_mr(struct ib_pd *pd, enum ib_uverbs_advise_mr_advice advice,
>>>>>    1703                     u32 lkey)
>>>>>
>>>>> ...
>>>>>
>>>>>    1721         /* prefetch with write-access must be supported by the MR */
>>>>>    1722         if (advice == IB_UVERBS_ADVISE_MR_ADVICE_PREFETCH_WRITE &&
>>>>>    1723             !mr->umem->writable) {
>>>>>    1724                 mr = NULL;
>>>>>    1725                 goto end;
>>>>>    1726         }
>>>> I would say that is an invalid mkey
>>> I see it is as wrong write access.
>> It just means the man page is wrong
> ok, it can be a solution too.

It sounds good.  I will try to update the manpage ibv_advise_mr(3) instead.


Thanks
Zhijian