linux-kernel - Re: [EXTERNAL] Re: [PATCH rdma-next 1/4] RDMA/mana_ib: Introduce helpers to create and destroy mana queues

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Date: Mon, 18 Mar 2024 14:56:42 +0100
From: Zhu Yanjun <yanjun.zhu@...ux.dev>
To: Konstantin Taranov <kotaranov@...rosoft.com>,
 Konstantin Taranov <kotaranov@...ux.microsoft.com>,
 "sharmaajay@...rosoft.com" <sharmaajay@...rosoft.com>,
 Long Li <longli@...rosoft.com>, "jgg@...pe.ca" <jgg@...pe.ca>,
 "leon@...nel.org" <leon@...nel.org>
Cc: "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [EXTERNAL] Re: [PATCH rdma-next 1/4] RDMA/mana_ib: Introduce
 helpers to create and destroy mana queues


On 18.03.24 10:31, Konstantin Taranov wrote:
>>> From: Konstantin Taranov <kotaranov@...rosoft.com>
>>>
>>> Intoduce helpers to work with mana ib queues (struct mana_ib_queue).
>>> A queue always consists of umem, gdma_region, and id.
>>> A queue can be used for a WQ or a CQ.
>>>
>>> Signed-off-by: Konstantin Taranov <kotaranov@...rosoft.com>
>>> ---
>>>    drivers/infiniband/hw/mana/main.c    | 40
>> ++++++++++++++++++++++++++++
>>>    drivers/infiniband/hw/mana/mana_ib.h | 10 +++++++
>>>    2 files changed, 50 insertions(+)
>>>
>>> diff --git a/drivers/infiniband/hw/mana/main.c
>>> b/drivers/infiniband/hw/mana/main.c
>>> index 71e33feee..0ec940b97 100644
>>> --- a/drivers/infiniband/hw/mana/main.c
>>> +++ b/drivers/infiniband/hw/mana/main.c
>>> @@ -237,6 +237,46 @@ void mana_ib_dealloc_ucontext(struct
>> ib_ucontext *ibcontext)
>>>                ibdev_dbg(ibdev, "Failed to destroy doorbell page %d\n", ret);
>>>    }
>>>
>>> +int mana_ib_create_queue(struct mana_ib_dev *mdev, u64 addr, u32 size,
>>> +                      struct mana_ib_queue *queue) {
>>> +     struct ib_umem *umem;
>>> +     int err;
>>> +
>>> +     queue->umem = NULL;
>>> +     queue->id = INVALID_QUEUE_ID;
>>> +     queue->gdma_region = GDMA_INVALID_DMA_REGION;
>>> +
>>> +     umem = ib_umem_get(&mdev->ib_dev, addr, size,
>> IB_ACCESS_LOCAL_WRITE);
>>> +     if (IS_ERR(umem)) {
>>> +             err = PTR_ERR(umem);
>>> +             ibdev_dbg(&mdev->ib_dev, "Failed to get umem, %d\n", err);
>>> +             return err;
>>> +     }
>>> +
>>> +     err = mana_ib_create_zero_offset_dma_region(mdev, umem, &queue-
>>> gdma_region);
>>> +     if (err) {
>>> +             ibdev_dbg(&mdev->ib_dev, "Failed to create dma region, %d\n",
>> err);
>>> +             goto free_umem;
>>> +     }
>>> +     queue->umem = umem;
>>> +
>>> +     ibdev_dbg(&mdev->ib_dev,
>>> +               "create_dma_region ret %d gdma_region 0x%llx\n",
>>> +               err, queue->gdma_region);
>>> +
>>> +     return 0;
>>> +free_umem:
>>> +     ib_umem_release(umem);
>>> +     return err;
>>> +}
>>> +
>>> +void mana_ib_destroy_queue(struct mana_ib_dev *mdev, struct
>>> +mana_ib_queue *queue) {
>>> +     mana_ib_gd_destroy_dma_region(mdev, queue->gdma_region);
>> The function mana_ib_gd_destroy_dma_region will call
>> mana_gd_destroy_dma_region. In the function
>> mana_gd_destroy_dma_region, the function mana_gd_send_request will
>> return the error -EPROTO.
>> The procedure is as below. So the function mana_ib_destroy_queue should
>> also handle this error?
> Thanks for the comment!
> This error can be ignored and it was ignored before this commit.
> I checked the corresponding Windows driver code, and it is also intentionally ignored there.
> I can add a comment that the error is ignored intentionally if you want.

Sure. Thanks a lot.

Zhu Yanjun

>
>> mana_ib_gd_destroy_dma_region --- > mana_gd_destroy_dma_region
>>
>>    693 int mana_gd_destroy_dma_region(struct gdma_context *gc, u64
>> dma_region_handle)
>>    694 {
>>
>> ...
>>
>>    706         err = mana_gd_send_request(gc, sizeof(req), &req,
>> sizeof(resp), &resp);
>>    707         if (err || resp.hdr.status) {
>>    708                 dev_err(gc->dev, "Failed to destroy DMA region:
>> %d, 0x%x\n",
>>    709                         err, resp.hdr.status);
>>    710                 return -EPROTO;
>>    711         }
>>
>> ...
>>
>>    714 }
>>
>> Zhu Yanjun
>>
>>> +     ib_umem_release(queue->umem);
>>> +}
>>> +
>>>    static int
>>>    mana_ib_gd_first_dma_region(struct mana_ib_dev *dev,
>>>                            struct gdma_context *gc, diff --git
>>> a/drivers/infiniband/hw/mana/mana_ib.h
>>> b/drivers/infiniband/hw/mana/mana_ib.h
>>> index f83390eeb..859fd3bfc 100644
>>> --- a/drivers/infiniband/hw/mana/mana_ib.h
>>> +++ b/drivers/infiniband/hw/mana/mana_ib.h
>>> @@ -45,6 +45,12 @@ struct mana_ib_adapter_caps {
>>>        u32 max_inline_data_size;
>>>    };
>>>
>>> +struct mana_ib_queue {
>>> +     struct ib_umem *umem;
>>> +     u64 gdma_region;
>>> +     u64 id;
>>> +};
>>> +
>>>    struct mana_ib_dev {
>>>        struct ib_device ib_dev;
>>>        struct gdma_dev *gdma_dev;
>>> @@ -169,6 +175,10 @@ int mana_ib_create_dma_region(struct
>> mana_ib_dev *dev, struct ib_umem *umem,
>>>    int mana_ib_gd_destroy_dma_region(struct mana_ib_dev *dev,
>>>                                  mana_handle_t gdma_region);
>>>
>>> +int mana_ib_create_queue(struct mana_ib_dev *mdev, u64 addr, u32 size,
>>> +                      struct mana_ib_queue *queue); void
>>> +mana_ib_destroy_queue(struct mana_ib_dev *mdev, struct
>> mana_ib_queue
>>> +*queue);
>>> +
>>>    struct ib_wq *mana_ib_create_wq(struct ib_pd *pd,
>>>                                struct ib_wq_init_attr *init_attr,
>>>                                struct ib_udata *udata);