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* [PATCH v2] vdpa/mlx5: Add support for doorbell bypassing
@ 2021-06-03  8:11 Eli Cohen
  2021-06-04  2:31   ` Jason Wang
  0 siblings, 1 reply; 3+ messages in thread
From: Eli Cohen @ 2021-06-03  8:11 UTC (permalink / raw)
  To: mst, jasowang, virtualization, linux-kernel; +Cc: elic

Implement mlx5_get_vq_notification() to return the doorbell address.
Since the notification area is mapped to userspace, make sure that the
BAR size is at least PAGE_SIZE large.

Signed-off-by: Eli Cohen <elic@nvidia.com>
---
v0 --> v1:
  Make sure SF bar size is not smaller than PAGE_SIZE
v1 --> v2:
  Remove test on addr alignment since it's alrady done by the caller.

 drivers/vdpa/mlx5/core/mlx5_vdpa.h |  1 +
 drivers/vdpa/mlx5/core/resources.c |  1 +
 drivers/vdpa/mlx5/net/mlx5_vnet.c  | 14 ++++++++++++++
 3 files changed, 16 insertions(+)

diff --git a/drivers/vdpa/mlx5/core/mlx5_vdpa.h b/drivers/vdpa/mlx5/core/mlx5_vdpa.h
index 09a16a3d1b2a..0002b2136b48 100644
--- a/drivers/vdpa/mlx5/core/mlx5_vdpa.h
+++ b/drivers/vdpa/mlx5/core/mlx5_vdpa.h
@@ -42,6 +42,7 @@ struct mlx5_vdpa_resources {
 	u32 pdn;
 	struct mlx5_uars_page *uar;
 	void __iomem *kick_addr;
+	u64 phys_kick_addr;
 	u16 uid;
 	u32 null_mkey;
 	bool valid;
diff --git a/drivers/vdpa/mlx5/core/resources.c b/drivers/vdpa/mlx5/core/resources.c
index 836ab9ef0fa6..d4606213f88a 100644
--- a/drivers/vdpa/mlx5/core/resources.c
+++ b/drivers/vdpa/mlx5/core/resources.c
@@ -253,6 +253,7 @@ int mlx5_vdpa_alloc_resources(struct mlx5_vdpa_dev *mvdev)
 		goto err_key;
 
 	kick_addr = mdev->bar_addr + offset;
+	res->phys_kick_addr = kick_addr;
 
 	res->kick_addr = ioremap(kick_addr, PAGE_SIZE);
 	if (!res->kick_addr) {
diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c
index 689d3fa61e08..bc33f2c523d3 100644
--- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
+++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
@@ -1879,8 +1879,22 @@ static void mlx5_vdpa_free(struct vdpa_device *vdev)
 
 static struct vdpa_notification_area mlx5_get_vq_notification(struct vdpa_device *vdev, u16 idx)
 {
+	struct mlx5_vdpa_dev *mvdev = to_mvdev(vdev);
 	struct vdpa_notification_area ret = {};
+	struct mlx5_vdpa_net *ndev;
+	phys_addr_t addr;
 
+	/* If SF BAR size is smaller than PAGE_SIZE, do not use direct
+	 * notification to avoid the risk of mapping pages that contain BAR of more
+	 * than one SF
+	 */
+	if (MLX5_CAP_GEN(mvdev->mdev, log_min_sf_size) + 12 < PAGE_SHIFT)
+		return ret;
+
+	ndev = to_mlx5_vdpa_ndev(mvdev);
+	addr = (phys_addr_t)ndev->mvdev.res.phys_kick_addr;
+	ret.addr = addr;
+	ret.size = PAGE_SIZE;
 	return ret;
 }
 
-- 
2.31.1


^ permalink raw reply related	[flat|nested] 3+ messages in thread
* Re: [PATCH v2] vdpa/mlx5: Add support for doorbell bypassing
  2021-06-03  8:11 [PATCH v2] vdpa/mlx5: Add support for doorbell bypassing Eli Cohen
@ 2021-06-04  2:31   ` Jason Wang
  0 siblings, 0 replies; 3+ messages in thread
From: Jason Wang @ 2021-06-04  2:31 UTC (permalink / raw)
  To: Eli Cohen, mst, virtualization, linux-kernel


在 2021/6/3 下午4:11, Eli Cohen 写道:
> Implement mlx5_get_vq_notification() to return the doorbell address.
> Since the notification area is mapped to userspace, make sure that the
> BAR size is at least PAGE_SIZE large.
>
> Signed-off-by: Eli Cohen <elic@nvidia.com>
> ---
> v0 --> v1:
>    Make sure SF bar size is not smaller than PAGE_SIZE
> v1 --> v2:
>    Remove test on addr alignment since it's alrady done by the caller.


Acked-by: Jason Wang <jasowang@redhat.com>


>
>   drivers/vdpa/mlx5/core/mlx5_vdpa.h |  1 +
>   drivers/vdpa/mlx5/core/resources.c |  1 +
>   drivers/vdpa/mlx5/net/mlx5_vnet.c  | 14 ++++++++++++++
>   3 files changed, 16 insertions(+)
>
> diff --git a/drivers/vdpa/mlx5/core/mlx5_vdpa.h b/drivers/vdpa/mlx5/core/mlx5_vdpa.h
> index 09a16a3d1b2a..0002b2136b48 100644
> --- a/drivers/vdpa/mlx5/core/mlx5_vdpa.h
> +++ b/drivers/vdpa/mlx5/core/mlx5_vdpa.h
> @@ -42,6 +42,7 @@ struct mlx5_vdpa_resources {
>   	u32 pdn;
>   	struct mlx5_uars_page *uar;
>   	void __iomem *kick_addr;
> +	u64 phys_kick_addr;
>   	u16 uid;
>   	u32 null_mkey;
>   	bool valid;
> diff --git a/drivers/vdpa/mlx5/core/resources.c b/drivers/vdpa/mlx5/core/resources.c
> index 836ab9ef0fa6..d4606213f88a 100644
> --- a/drivers/vdpa/mlx5/core/resources.c
> +++ b/drivers/vdpa/mlx5/core/resources.c
> @@ -253,6 +253,7 @@ int mlx5_vdpa_alloc_resources(struct mlx5_vdpa_dev *mvdev)
>   		goto err_key;
>   
>   	kick_addr = mdev->bar_addr + offset;
> +	res->phys_kick_addr = kick_addr;
>   
>   	res->kick_addr = ioremap(kick_addr, PAGE_SIZE);
>   	if (!res->kick_addr) {
> diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> index 689d3fa61e08..bc33f2c523d3 100644
> --- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
> +++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> @@ -1879,8 +1879,22 @@ static void mlx5_vdpa_free(struct vdpa_device *vdev)
>   
>   static struct vdpa_notification_area mlx5_get_vq_notification(struct vdpa_device *vdev, u16 idx)
>   {
> +	struct mlx5_vdpa_dev *mvdev = to_mvdev(vdev);
>   	struct vdpa_notification_area ret = {};
> +	struct mlx5_vdpa_net *ndev;
> +	phys_addr_t addr;
>   
> +	/* If SF BAR size is smaller than PAGE_SIZE, do not use direct
> +	 * notification to avoid the risk of mapping pages that contain BAR of more
> +	 * than one SF
> +	 */
> +	if (MLX5_CAP_GEN(mvdev->mdev, log_min_sf_size) + 12 < PAGE_SHIFT)
> +		return ret;
> +
> +	ndev = to_mlx5_vdpa_ndev(mvdev);
> +	addr = (phys_addr_t)ndev->mvdev.res.phys_kick_addr;
> +	ret.addr = addr;
> +	ret.size = PAGE_SIZE;
>   	return ret;
>   }
>   


^ permalink raw reply	[flat|nested] 3+ messages in thread
* Re: [PATCH v2] vdpa/mlx5: Add support for doorbell bypassing
@ 2021-06-04  2:31   ` Jason Wang
  0 siblings, 0 replies; 3+ messages in thread
From: Jason Wang @ 2021-06-04  2:31 UTC (permalink / raw)
  To: Eli Cohen, mst, virtualization, linux-kernel


在 2021/6/3 下午4:11, Eli Cohen 写道:
> Implement mlx5_get_vq_notification() to return the doorbell address.
> Since the notification area is mapped to userspace, make sure that the
> BAR size is at least PAGE_SIZE large.
>
> Signed-off-by: Eli Cohen <elic@nvidia.com>
> ---
> v0 --> v1:
>    Make sure SF bar size is not smaller than PAGE_SIZE
> v1 --> v2:
>    Remove test on addr alignment since it's alrady done by the caller.


Acked-by: Jason Wang <jasowang@redhat.com>


>
>   drivers/vdpa/mlx5/core/mlx5_vdpa.h |  1 +
>   drivers/vdpa/mlx5/core/resources.c |  1 +
>   drivers/vdpa/mlx5/net/mlx5_vnet.c  | 14 ++++++++++++++
>   3 files changed, 16 insertions(+)
>
> diff --git a/drivers/vdpa/mlx5/core/mlx5_vdpa.h b/drivers/vdpa/mlx5/core/mlx5_vdpa.h
> index 09a16a3d1b2a..0002b2136b48 100644
> --- a/drivers/vdpa/mlx5/core/mlx5_vdpa.h
> +++ b/drivers/vdpa/mlx5/core/mlx5_vdpa.h
> @@ -42,6 +42,7 @@ struct mlx5_vdpa_resources {
>   	u32 pdn;
>   	struct mlx5_uars_page *uar;
>   	void __iomem *kick_addr;
> +	u64 phys_kick_addr;
>   	u16 uid;
>   	u32 null_mkey;
>   	bool valid;
> diff --git a/drivers/vdpa/mlx5/core/resources.c b/drivers/vdpa/mlx5/core/resources.c
> index 836ab9ef0fa6..d4606213f88a 100644
> --- a/drivers/vdpa/mlx5/core/resources.c
> +++ b/drivers/vdpa/mlx5/core/resources.c
> @@ -253,6 +253,7 @@ int mlx5_vdpa_alloc_resources(struct mlx5_vdpa_dev *mvdev)
>   		goto err_key;
>   
>   	kick_addr = mdev->bar_addr + offset;
> +	res->phys_kick_addr = kick_addr;
>   
>   	res->kick_addr = ioremap(kick_addr, PAGE_SIZE);
>   	if (!res->kick_addr) {
> diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> index 689d3fa61e08..bc33f2c523d3 100644
> --- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
> +++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> @@ -1879,8 +1879,22 @@ static void mlx5_vdpa_free(struct vdpa_device *vdev)
>   
>   static struct vdpa_notification_area mlx5_get_vq_notification(struct vdpa_device *vdev, u16 idx)
>   {
> +	struct mlx5_vdpa_dev *mvdev = to_mvdev(vdev);
>   	struct vdpa_notification_area ret = {};
> +	struct mlx5_vdpa_net *ndev;
> +	phys_addr_t addr;
>   
> +	/* If SF BAR size is smaller than PAGE_SIZE, do not use direct
> +	 * notification to avoid the risk of mapping pages that contain BAR of more
> +	 * than one SF
> +	 */
> +	if (MLX5_CAP_GEN(mvdev->mdev, log_min_sf_size) + 12 < PAGE_SHIFT)
> +		return ret;
> +
> +	ndev = to_mlx5_vdpa_ndev(mvdev);
> +	addr = (phys_addr_t)ndev->mvdev.res.phys_kick_addr;
> +	ret.addr = addr;
> +	ret.size = PAGE_SIZE;
>   	return ret;
>   }
>   

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^ permalink raw reply	[flat|nested] 3+ messages in thread
end of thread, other threads:[~2021-06-04  2:32 UTC | newest]

Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2021-06-03  8:11 [PATCH v2] vdpa/mlx5: Add support for doorbell bypassing Eli Cohen
2021-06-04  2:31 ` Jason Wang
2021-06-04  2:31   ` Jason Wang

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