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From: Jason Gunthorpe <jgg@nvidia.com>
To: Leon Romanovsky <leon@kernel.org>
Cc: Doug Ledford <dledford@redhat.com>,
	Aharon Landau <aharonl@nvidia.com>,
	Jakub Kicinski <kuba@kernel.org>,
	Jason Wang <jasowang@redhat.com>,
	linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org,
	"Michael S. Tsirkin" <mst@redhat.com>,
	netdev@vger.kernel.org, Saeed Mahameed <saeedm@nvidia.com>,
	Shay Drory <shayd@nvidia.com>,
	virtualization@lists.linux-foundation.org
Subject: Re: [PATCH mlx5-next 1/5] RDMA/mlx5: Replace struct mlx5_core_mkey by u32 key
Date: Thu, 29 Jul 2021 15:08:55 -0300	[thread overview]
Message-ID: <20210729180855.GA2401905@nvidia.com> (raw)
In-Reply-To: <2e0feba18d8fe310b2ed38fbfbdd4af7a9b84bf1.1624362290.git.leonro@nvidia.com>

On Tue, Jun 22, 2021 at 03:08:19PM +0300, Leon Romanovsky wrote:

> diff --git a/drivers/infiniband/hw/mlx5/mr.c b/drivers/infiniband/hw/mlx5/mr.c
> index 03dc6c22843f..ae0472d92801 100644
> +++ b/drivers/infiniband/hw/mlx5/mr.c
> @@ -89,24 +89,39 @@ static void set_mkc_access_pd_addr_fields(void *mkc, int acc, u64 start_addr,
>  	MLX5_SET64(mkc, mkc, start_addr, start_addr);
>  }
>  
> -static void
> -assign_mkey_variant(struct mlx5_ib_dev *dev, struct mlx5_core_mkey *mkey,
> -		    u32 *in)
> +static void assign_mkey_variant(struct mlx5_ib_dev *dev, u32 *mkey, u32 *in)
>  {
>  	u8 key = atomic_inc_return(&dev->mkey_var);
>  	void *mkc;
>  
>  	mkc = MLX5_ADDR_OF(create_mkey_in, in, memory_key_mkey_entry);
>  	MLX5_SET(mkc, mkc, mkey_7_0, key);
> -	mkey->key = key;
> +	*mkey = key;
> +}

Can this be tidied please? We set both mkey_7_0 and mkey then pass
them into mlx5_core_create_mkey which then does

	*mkey = (u32)mlx5_mkey_variant(*mkey) | mlx5_idx_to_mkey(mkey_index);

But isn't mlx5_mkey_variant(*mkey) just MLX5_GET(mkc, in, mkey_7_0)
and we can get rid of this confusing sequence?

> +
> +static void set_mkey_fields(void *mkc, struct mlx5_core_mkey *mkey)
> +{
> +	mkey->iova = MLX5_GET64(mkc, mkc, start_addr);
> +	mkey->size = MLX5_GET64(mkc, mkc, len);
> +	mkey->pd = MLX5_GET(mkc, mkc, pd);
> +	init_waitqueue_head(&mkey->wait);
>  }

Why isn't this called through the create_mkey_callback() path? I think
evey mkey should always have a valid waitqueue

Jason

  parent reply	other threads:[~2021-07-29 18:09 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-22 12:08 [PATCH rdma-next 0/5] mlx5 MR cache enhancements Leon Romanovsky
2021-06-22 12:08 ` [PATCH mlx5-next 1/5] RDMA/mlx5: Replace struct mlx5_core_mkey by u32 key Leon Romanovsky
2021-07-29 15:28   ` Jason Gunthorpe
2021-07-29 17:27     ` Leon Romanovsky
2021-07-29 18:08   ` Jason Gunthorpe [this message]
2021-06-22 12:08 ` [PATCH mlx5-next 2/5] RDMA/mlx5: Move struct mlx5_core_mkey to mlx5_ib Leon Romanovsky
2021-07-29 18:39   ` Jason Gunthorpe
2021-06-22 12:08 ` [PATCH mlx5-next 3/5] RDMA/mlx5: Change the cache to hold mkeys instead of MRs Leon Romanovsky
2021-07-29 19:08   ` Jason Gunthorpe
2021-06-22 12:08 ` [PATCH mlx5-next 4/5] RDMA/mlx5: Change the cache structure to an rbtree Leon Romanovsky
2021-07-29 19:45   ` Jason Gunthorpe
2021-06-22 12:08 ` [PATCH rdma-next 5/5] RDMA/mlx5: Delay the deregistration of a non-cache mkey Leon Romanovsky

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