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Message-ID: <CAJaqyWe29MmDZgUkrOKibWN4MGjt+sWvsNfk6SeRHhEHPJYC5g@mail.gmail.com>
Date: Thu, 29 Aug 2024 16:37:37 +0200
From: Eugenio Perez Martin <eperezma@...hat.com>
To: Dragos Tatulea <dtatulea@...dia.com>
Cc: "Michael S . Tsirkin" <mst@...hat.com>, Jason Wang <jasowang@...hat.com>, 
	Si-Wei Liu <si-wei.liu@...cle.com>, virtualization@...ts.linux-foundation.org, 
	Gal Pressman <gal@...dia.com>, kvm@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Parav Pandit <parav@...dia.com>, Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, 
	Cosmin Ratiu <cratiu@...dia.com>
Subject: Re: [PATCH vhost 6/7] vdpa/mlx5: Introduce init/destroy for MR resources

On Wed, Aug 21, 2024 at 1:42 PM Dragos Tatulea <dtatulea@...dia.com> wrote:
>
> There's currently not a lot of action happening during
> the init/destroy of MR resources. But more will be added
> in the upcoming patches.

If the series doesn't receive new patches, it is just the next patch :).

>
> Signed-off-by: Dragos Tatulea <dtatulea@...dia.com>
> Reviewed-by: Cosmin Ratiu <cratiu@...dia.com>
> ---
>  drivers/vdpa/mlx5/core/mlx5_vdpa.h |  2 ++
>  drivers/vdpa/mlx5/core/mr.c        | 17 +++++++++++++++++
>  drivers/vdpa/mlx5/core/resources.c |  3 ---
>  drivers/vdpa/mlx5/net/mlx5_vnet.c  | 10 ++++++++--
>  4 files changed, 27 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/vdpa/mlx5/core/mlx5_vdpa.h b/drivers/vdpa/mlx5/core/mlx5_vdpa.h
> index 89b564cecddf..c3e17bc888e8 100644
> --- a/drivers/vdpa/mlx5/core/mlx5_vdpa.h
> +++ b/drivers/vdpa/mlx5/core/mlx5_vdpa.h
> @@ -138,6 +138,8 @@ int mlx5_vdpa_create_mkey(struct mlx5_vdpa_dev *mvdev, u32 *mkey, u32 *in,
>  int mlx5_vdpa_destroy_mkey(struct mlx5_vdpa_dev *mvdev, u32 mkey);
>  struct mlx5_vdpa_mr *mlx5_vdpa_create_mr(struct mlx5_vdpa_dev *mvdev,
>                                          struct vhost_iotlb *iotlb);
> +int mlx5_vdpa_init_mr_resources(struct mlx5_vdpa_dev *mvdev);
> +void mlx5_vdpa_destroy_mr_resources(struct mlx5_vdpa_dev *mvdev);
>  void mlx5_vdpa_clean_mrs(struct mlx5_vdpa_dev *mvdev);
>  void mlx5_vdpa_get_mr(struct mlx5_vdpa_dev *mvdev,
>                       struct mlx5_vdpa_mr *mr);
> diff --git a/drivers/vdpa/mlx5/core/mr.c b/drivers/vdpa/mlx5/core/mr.c
> index f20f2a8a701d..ec75f165f832 100644
> --- a/drivers/vdpa/mlx5/core/mr.c
> +++ b/drivers/vdpa/mlx5/core/mr.c
> @@ -843,3 +843,20 @@ int mlx5_vdpa_reset_mr(struct mlx5_vdpa_dev *mvdev, unsigned int asid)
>
>         return 0;
>  }
> +
> +int mlx5_vdpa_init_mr_resources(struct mlx5_vdpa_dev *mvdev)
> +{
> +       struct mlx5_vdpa_mr_resources *mres = &mvdev->mres;
> +
> +       INIT_LIST_HEAD(&mres->mr_list_head);
> +       mutex_init(&mres->lock);
> +
> +       return 0;

I'd leave this function return void here and remove the caller error
control path.

> +}
> +
> +void mlx5_vdpa_destroy_mr_resources(struct mlx5_vdpa_dev *mvdev)
> +{
> +       struct mlx5_vdpa_mr_resources *mres = &mvdev->mres;
> +
> +       mutex_destroy(&mres->lock);
> +}
> diff --git a/drivers/vdpa/mlx5/core/resources.c b/drivers/vdpa/mlx5/core/resources.c
> index fe2ca3458f6c..aeae31d0cefa 100644
> --- a/drivers/vdpa/mlx5/core/resources.c
> +++ b/drivers/vdpa/mlx5/core/resources.c
> @@ -256,7 +256,6 @@ int mlx5_vdpa_alloc_resources(struct mlx5_vdpa_dev *mvdev)
>                 mlx5_vdpa_warn(mvdev, "resources already allocated\n");
>                 return -EINVAL;
>         }
> -       mutex_init(&mvdev->mres.lock);
>         res->uar = mlx5_get_uars_page(mdev);
>         if (IS_ERR(res->uar)) {
>                 err = PTR_ERR(res->uar);
> @@ -301,7 +300,6 @@ int mlx5_vdpa_alloc_resources(struct mlx5_vdpa_dev *mvdev)
>  err_uctx:
>         mlx5_put_uars_page(mdev, res->uar);
>  err_uars:
> -       mutex_destroy(&mvdev->mres.lock);

Maybe it is just me, but this patch is also moving the lock lifetime
from mlx5_vdpa_alloc_resources / mlx5_vdpa_free_resources to
mlx5_vdpa_dev_add / mlx5_vdpa_free. I guess it has a justification we
can either clarify in the patch message or split in its own patch.

>         return err;
>  }
>
> @@ -318,7 +316,6 @@ void mlx5_vdpa_free_resources(struct mlx5_vdpa_dev *mvdev)
>         dealloc_pd(mvdev, res->pdn, res->uid);
>         destroy_uctx(mvdev, res->uid);
>         mlx5_put_uars_page(mvdev->mdev, res->uar);
> -       mutex_destroy(&mvdev->mres.lock);
>         res->valid = false;
>  }
>
> diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> index 8a51c492a62a..1cadcb05a5c7 100644
> --- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
> +++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> @@ -3434,6 +3434,7 @@ static void mlx5_vdpa_free(struct vdpa_device *vdev)
>
>         free_fixed_resources(ndev);
>         mlx5_vdpa_clean_mrs(mvdev);
> +       mlx5_vdpa_destroy_mr_resources(&ndev->mvdev);
>         if (!is_zero_ether_addr(ndev->config.mac)) {
>                 pfmdev = pci_get_drvdata(pci_physfn(mvdev->mdev->pdev));
>                 mlx5_mpfs_del_mac(pfmdev, ndev->config.mac);
> @@ -3962,12 +3963,15 @@ static int mlx5_vdpa_dev_add(struct vdpa_mgmt_dev *v_mdev, const char *name,
>         if (err)
>                 goto err_mpfs;
>
> -       INIT_LIST_HEAD(&mvdev->mres.mr_list_head);
> +       err = mlx5_vdpa_init_mr_resources(mvdev);
> +       if (err)
> +               goto err_res;
> +

Extra newline here.

>
>         if (MLX5_CAP_GEN(mvdev->mdev, umem_uid_0)) {
>                 err = mlx5_vdpa_create_dma_mr(mvdev);
>                 if (err)
> -                       goto err_res;
> +                       goto err_mr_res;
>         }
>
>         err = alloc_fixed_resources(ndev);
> @@ -4009,6 +4013,8 @@ static int mlx5_vdpa_dev_add(struct vdpa_mgmt_dev *v_mdev, const char *name,
>         free_fixed_resources(ndev);
>  err_mr:
>         mlx5_vdpa_clean_mrs(mvdev);
> +err_mr_res:
> +       mlx5_vdpa_destroy_mr_resources(mvdev);
>  err_res:
>         mlx5_vdpa_free_resources(&ndev->mvdev);
>  err_mpfs:
> --
> 2.45.1
>


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