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From: "Xia, Chenbo" <chenbo.xia@intel.com>
To: "Pei, Andy" <andy.pei@intel.com>, "dev@dpdk.org" <dev@dpdk.org>
CC: "maxime.coquelin@redhat.com" <maxime.coquelin@redhat.com>, "Cao, Gang"
 <gang.cao@intel.com>, "Liu, Changpeng" <changpeng.liu@intel.com>
Subject: RE: [PATCH v7 07/18] vhost: add API to get vDPA device type
Thread-Topic: [PATCH v7 07/18] vhost: add API to get vDPA device type
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Date: Thu, 12 May 2022 13:14:22 +0000
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> -----Original Message-----
> From: Pei, Andy <andy.pei@intel.com>
> Sent: Wednesday, April 27, 2022 4:30 PM
> To: dev@dpdk.org
> Cc: Xia, Chenbo <chenbo.xia@intel.com>; maxime.coquelin@redhat.com; Cao,
> Gang <gang.cao@intel.com>; Liu, Changpeng <changpeng.liu@intel.com>
> Subject: [PATCH v7 07/18] vhost: add API to get vDPA device type
>=20
> Vhost backend of different devices have different features.
> Add a API to get vDPA device type, net device or blk device
> currently, so users can set different features for different
> kinds of devices.
>=20
> Signed-off-by: Andy Pei <andy.pei@intel.com>
> ---
>  lib/vhost/rte_vhost.h   | 17 +++++++++++++++++
>  lib/vhost/socket.c      | 39 +++++++++++++++++++++++++++++++++++++++
>  lib/vhost/vdpa_driver.h |  3 +++
>  lib/vhost/version.map   |  2 ++
>  4 files changed, 61 insertions(+)
>=20
> diff --git a/lib/vhost/rte_vhost.h b/lib/vhost/rte_vhost.h
> index c733f85..c977a24 100644
> --- a/lib/vhost/rte_vhost.h
> +++ b/lib/vhost/rte_vhost.h
> @@ -117,6 +117,9 @@
>=20
>  #define RTE_MAX_VHOST_DEVICE	1024
>=20
> +#define VDPA_DEVICE_TYPE_NET 0
> +#define VDPA_DEVICE_TYPE_BLK 1
> +
>  struct rte_vdpa_device;
>=20
>  /**
> @@ -486,6 +489,20 @@ struct rte_vdpa_device *
>  rte_vhost_driver_get_vdpa_device(const char *path);
>=20
>  /**
> + * Get the device type of the vdpa device.
> + *
> + * @param path
> + *  The vhost-user socket file path
> + * @param type
> + *  the device type of the vdpa device
> + * @return
> + *  0 on success, -1 on failure
> + */
> +__rte_experimental
> +int
> +rte_vhost_driver_get_vdpa_dev_type(const char *path, uint32_t *type);
> +
> +/**
>   * Set the feature bits the vhost-user driver supports.
>   *
>   * @param path
> diff --git a/lib/vhost/socket.c b/lib/vhost/socket.c
> index b304339..7da90e8 100644
> --- a/lib/vhost/socket.c
> +++ b/lib/vhost/socket.c
> @@ -619,6 +619,45 @@ struct rte_vdpa_device *
>  }
>=20
>  int
> +rte_vhost_driver_get_vdpa_dev_type(const char *path, uint32_t *type)
> +{
> +	struct vhost_user_socket *vsocket;
> +	struct rte_vdpa_device *vdpa_dev;
> +	uint32_t vdpa_type =3D 0;
> +	int ret =3D 0;
> +
> +	pthread_mutex_lock(&vhost_user.mutex);
> +	vsocket =3D find_vhost_user_socket(path);
> +	if (!vsocket) {
> +		VHOST_LOG_CONFIG(ERR,
> +				 "(%s) socket file is not registered yet.\n",
> +				 path);
> +		ret =3D -1;
> +		goto unlock_exit;
> +	}
> +
> +	vdpa_dev =3D vsocket->vdpa_dev;
> +	if (!vdpa_dev) {
> +		ret =3D -1;
> +		goto unlock_exit;
> +	}
> +
> +	if (vdpa_dev->ops->get_dev_type(vdpa_dev, &vdpa_type) < 0) {
> +		VHOST_LOG_CONFIG(ERR,
> +			"(%s) failed to get vdpa dev type for socket file.\n",
> +			path);
> +		ret =3D -1;
> +		goto unlock_exit;
> +	}

If vendor's vdpa driver does not implement this callback, should return typ=
e NET.
Another way to do may be make every vdpa driver implement the callback, but=
 since
other vendors only have one type. I prefer the first way.

> +
> +	*type =3D vdpa_type;
> +
> +unlock_exit:
> +	pthread_mutex_unlock(&vhost_user.mutex);
> +	return ret;
> +}
> +
> +int
>  rte_vhost_driver_disable_features(const char *path, uint64_t features)
>  {
>  	struct vhost_user_socket *vsocket;
> diff --git a/lib/vhost/vdpa_driver.h b/lib/vhost/vdpa_driver.h
> index e59a834..9cbd7cd 100644
> --- a/lib/vhost/vdpa_driver.h
> +++ b/lib/vhost/vdpa_driver.h
> @@ -78,6 +78,9 @@ struct rte_vdpa_dev_ops {
>  	/** Set the device configuration space */
>  	int (*set_config)(int vid, uint8_t *config, uint32_t offset,
>  		      uint32_t size, uint32_t flags);
> +
> +	/** get device type: net device, blk device... */
> +	int (*get_dev_type)(struct rte_vdpa_device *dev, uint32_t *type);
>  };
>=20
>  /**
> diff --git a/lib/vhost/version.map b/lib/vhost/version.map
> index 0a66c58..fe4e8de 100644
> --- a/lib/vhost/version.map
> +++ b/lib/vhost/version.map
> @@ -87,6 +87,8 @@ EXPERIMENTAL {
>=20
>  	# added in 22.03
>  	rte_vhost_async_dma_configure;
> +
> +	rte_vhost_driver_get_vdpa_dev_type;

Missed '# added in 22.07' tag, but when you do v8, this may not be a proble=
m
as other patches may add this tag with new API introduced.

And introducing new API will need update of release note.
Please refer to http://git.dpdk.org/next/dpdk-next-virtio/commit/?id=3D8688=
83e899af386abcc298ea80ec7f6a18d8a8e7
as an example.

Thanks,
Chenbo

>  };
>=20
>  INTERNAL {
> --
> 1.8.3.1