linux-kernel - Re: [PATCH v1] vdpa/mlx5: Fix umem sizes assignments on VQ create

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Message-ID: <20210530043721-mutt-send-email-mst@kernel.org>
Date:   Sun, 30 May 2021 04:37:39 -0400
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Eli Cohen <elic@...dia.com>
Cc:     jasowang@...hat.com, virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] vdpa/mlx5: Fix umem sizes assignments on VQ create

On Sun, May 30, 2021 at 11:35:48AM +0300, Eli Cohen wrote:
> Fix copy paste bug assigning umem1 size to umem2 and umem3. The issue
> was discovered when trying to use a 1:1 MR that covers the entire
> address space where firmware complained that provided sizes are not
> large enough.

.. creating the virtqueue then fails?

> 1:1 MRs are requied to support virtio_vdpa.

typo

> 
> Fixes: 1a86b377aa21 ("vdpa/mlx5: Add VDPA driver for supported mlx5 devices")
> Signed-off-by: Eli Cohen <elic@...dia.com>
> ---
> V0 --> V1:
> Add more information in changelog
> 
>  drivers/vdpa/mlx5/net/mlx5_vnet.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> index 189e4385df40..53312f0460ad 100644
> --- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
> +++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> @@ -828,9 +828,9 @@ static int create_virtqueue(struct mlx5_vdpa_net *ndev, struct mlx5_vdpa_virtque
>  	MLX5_SET(virtio_q, vq_ctx, umem_1_id, mvq->umem1.id);
>  	MLX5_SET(virtio_q, vq_ctx, umem_1_size, mvq->umem1.size);
>  	MLX5_SET(virtio_q, vq_ctx, umem_2_id, mvq->umem2.id);
> -	MLX5_SET(virtio_q, vq_ctx, umem_2_size, mvq->umem1.size);
> +	MLX5_SET(virtio_q, vq_ctx, umem_2_size, mvq->umem2.size);
>  	MLX5_SET(virtio_q, vq_ctx, umem_3_id, mvq->umem3.id);
> -	MLX5_SET(virtio_q, vq_ctx, umem_3_size, mvq->umem1.size);
> +	MLX5_SET(virtio_q, vq_ctx, umem_3_size, mvq->umem3.size);
>  	MLX5_SET(virtio_q, vq_ctx, pd, ndev->mvdev.res.pdn);
>  	if (MLX5_CAP_DEV_VDPA_EMULATION(ndev->mvdev.mdev, eth_frame_offload_type))
>  		MLX5_SET(virtio_q, vq_ctx, virtio_version_1_0, 1);
> -- 
> 2.31.1