linux-kernel - Re: [PATCH V3 rdma-next 4/4] RDMA/hns: Implement the disassociate

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Date:   Tue, 29 May 2018 19:36:46 +0800
From:   "Wei Hu (Xavier)" <xavier.huwei@...wei.com>
To:     Jason Gunthorpe <jgg@...pe.ca>
CC:     <dledford@...hat.com>, <linux-rdma@...r.kernel.org>,
        <lijun_nudt@....com>, <oulijun@...wei.com>,
        <charles.chenxin@...wei.com>, <linux-kernel@...r.kernel.org>,
        <leonro@...lanox.com>
Subject: Re: [PATCH V3 rdma-next 4/4] RDMA/hns: Implement the
 disassociate_ucontext API



On 2018/5/29 0:53, Jason Gunthorpe wrote:
> On Sat, May 26, 2018 at 04:41:47PM +0800, Wei Hu (Xavier) wrote:
>> This patch implemented the IB core disassociate_ucontext API.
>>
>> Signed-off-by: Wei Hu (Xavier) <xavier.huwei@...wei.com>
>>
>> v2->v3: Addressed the comments from Jason. The related link:
>> 	https://lkml.org/lkml/2018/5/22/967
>> v1->v2: no change.
>>  drivers/infiniband/hw/hns/hns_roce_device.h |  8 ++++
>>  drivers/infiniband/hw/hns/hns_roce_main.c   | 70 ++++++++++++++++++++++++++++-
>>  2 files changed, 77 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/infiniband/hw/hns/hns_roce_device.h b/drivers/infiniband/hw/hns/hns_roce_device.h
>> index da8512b..31221d5 100644
>> +++ b/drivers/infiniband/hw/hns/hns_roce_device.h
>> @@ -217,11 +217,19 @@ struct hns_roce_uar {
>>  	unsigned long	logic_idx;
>>  };
>>  
>> +struct hns_roce_vma_data {
>> +	struct list_head list;
>> +	struct vm_area_struct *vma;
>> +	struct mutex *vma_list_mutex;
>> +};
> This stuff is basically shared in all the drivers too - would it make
> sense to maintain this information and do the zap_pte in the core code
> as well?
>
> There is no way to implement dis-associate without also doing the
> zaps..
>
> Jason
>
> .
Hi, Jason
    You may have noticed there are difference about the process of
zap_vmp_ptes
    between mlx4_ib_disassociate_ucontext and mlx5_ib_disassociate_ucontext
    If I hoist zap_vmp_ptes process into the core code, Maybe need to
modify more mlx4 code.
    Maybe I am not the right person to do this thing,  Could you give
more suggestion?
    Thanks   

    Regards
Wei Hu
>