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

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Date: Sun, 17 Mar 2024 07:42:41 +0100
From: Zhu Yanjun <yanjun.zhu@...ux.dev>
To: Konstantin Taranov <kotaranov@...ux.microsoft.com>,
 kotaranov@...rosoft.com, sharmaajay@...rosoft.com, longli@...rosoft.com,
 jgg@...pe.ca, leon@...nel.org
Cc: linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH rdma-next 1/4] RDMA/mana_ib: Introduce helpers to create
 and destroy mana queues

在 2024/3/13 14:24, Konstantin Taranov 写道:
> 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?

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);