netdev - Re: [PATCH v3 1/1] RDMA/mana_ib: Add EQ interrupt support to mana ib driver.

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Date: Thu, 15 Jun 2023 16:00:05 +0200
From: Simon Horman <simon.horman@...igine.com>
To: Wei Hu <weh@...rosoft.com>
Cc: netdev@...r.kernel.org, linux-hyperv@...r.kernel.org,
	linux-rdma@...r.kernel.org, longli@...rosoft.com,
	sharmaajay@...rosoft.com, jgg@...pe.ca, leon@...nel.org,
	kys@...rosoft.com, haiyangz@...rosoft.com, wei.liu@...nel.org,
	decui@...rosoft.com, davem@...emloft.net, edumazet@...gle.com,
	kuba@...nel.org, pabeni@...hat.com, vkuznets@...hat.com,
	ssengar@...ux.microsoft.com, shradhagupta@...ux.microsoft.com
Subject: Re: [PATCH v3 1/1] RDMA/mana_ib: Add EQ interrupt support to mana ib
 driver.

On Thu, Jun 15, 2023 at 11:14:12AM +0000, Wei Hu wrote:

Hi Wei Hu,

some minor nits from my side.

...

> @@ -69,11 +76,35 @@ int mana_ib_destroy_cq(struct ib_cq *ibcq, struct ib_udata *udata)
>  	struct mana_ib_cq *cq = container_of(ibcq, struct mana_ib_cq, ibcq);
>  	struct ib_device *ibdev = ibcq->device;
>  	struct mana_ib_dev *mdev;
> +	struct gdma_context *gc;
> +	struct gdma_dev *gd;
> +	int err;
> +
>  
>  	mdev = container_of(ibdev, struct mana_ib_dev, ib_dev);
> +	gd = mdev->gdma_dev;
> +	gc = gd->gdma_context;
> +
>  
> -	mana_ib_gd_destroy_dma_region(mdev, cq->gdma_region);
> -	ib_umem_release(cq->umem);
> +
> +	if (atomic_read(&ibcq->usecnt) == 0) {
> +		err = mana_ib_gd_destroy_dma_region(mdev, cq->gdma_region);
> +		if (err) {
> +			ibdev_dbg(ibdev,
> +				  "Faile to destroy dma region, %d\n", err);

nit: Faile -> Failed

> +			return err;
> +		}
> +		kfree(gc->cq_table[cq->id]);
> +		gc->cq_table[cq->id] = NULL;
> +		ib_umem_release(cq->umem);
> +	}
>  
>  	return 0;
>  }

...

> diff --git a/drivers/infiniband/hw/mana/main.c b/drivers/infiniband/hw/mana/main.c
> index 7be4c3adb4e2..e2affb6ae5ad 100644
> --- a/drivers/infiniband/hw/mana/main.c
> +++ b/drivers/infiniband/hw/mana/main.c
> @@ -143,6 +143,79 @@ int mana_ib_dealloc_pd(struct ib_pd *ibpd, struct ib_udata *udata)
>  	return err;
>  }
>  
> +static void mana_ib_destroy_eq(struct mana_ib_ucontext *ucontext,
> +			       struct mana_ib_dev *mdev)
> +{
> +	struct gdma_context *gc = mdev->gdma_dev->gdma_context;
> +	struct ib_device *ibdev = ucontext->ibucontext.device;

nit: ibdev is set but unused.

GCC 12.3.0 with W=1 says:

 drivers/infiniband/hw/mana/main.c: In function 'mana_ib_destroy_eq':
 drivers/infiniband/hw/mana/main.c:150:27: warning: unused variable 'ibdev' [-Wunused-variable]
   150 |         struct ib_device *ibdev = ucontext->ibucontext.device;

> +	struct gdma_queue *eq;
> +	int i;
> +
> +	if (!ucontext->eqs)
> +		return;
> +
> +	for (i = 0; i < gc->max_num_queues; i++) {
> +		eq = ucontext->eqs[i].eq;
> +		if (!eq)
> +			continue;
> +
> +		mana_gd_destroy_queue(gc, eq);
> +	}
> +
> +	kfree(ucontext->eqs);
> +	ucontext->eqs = NULL;
> +}

...