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From: "Michael S. Tsirkin" <mst@redhat.com>
To: Parav Pandit <parav@nvidia.com>
Cc: virtualization@lists.linux-foundation.org, jasowang@redhat.com,
	elic@nvidia.com, netdev@vger.kernel.org
Subject: Re: [PATCH linux-next v3 6/6] vdpa_sim_net: Add support for user supported devices
Date: Tue, 5 Jan 2021 06:48:58 -0500
Message-ID: <20210105064707-mutt-send-email-mst@kernel.org> (raw)
In-Reply-To: <20210105103203.82508-7-parav@nvidia.com>

On Tue, Jan 05, 2021 at 12:32:03PM +0200, Parav Pandit wrote:
> Enable user to create vdpasim net simulate devices.
> 
> Show vdpa management device that supports creating, deleting vdpa devices.
> 
> $ vdpa mgmtdev show
> vdpasim_net:
>   supported_classes
>     net
> 
> $ vdpa mgmtdev show -jp
> {
>     "show": {
>         "vdpasim_net": {
>             "supported_classes": {
>               "net"
>         }
>     }
> }
> 
> Create a vdpa device of type networking named as "foo2" from
> the management device vdpasim:
> 
> $ vdpa dev add mgmtdev vdpasim_net name foo2
> 
> Show the newly created vdpa device by its name:
> $ vdpa dev show foo2
> foo2: type network mgmtdev vdpasim_net vendor_id 0 max_vqs 2 max_vq_size 256
> 
> $ vdpa dev show foo2 -jp
> {
>     "dev": {
>         "foo2": {
>             "type": "network",
>             "mgmtdev": "vdpasim_net",
>             "vendor_id": 0,
>             "max_vqs": 2,
>             "max_vq_size": 256
>         }
>     }
> }


I'd like an example of how do device specific
(e.g. net specific) interfaces tie in to this.


> Delete the vdpa device after its use:
> $ vdpa dev del foo2
> 
> Signed-off-by: Parav Pandit <parav@nvidia.com>
> Reviewed-by: Eli Cohen <elic@nvidia.com>
> Acked-by: Jason Wang <jasowang@redhat.com>
> ---
> Changelog:
> v2->v3:
>  - removed code branches due to default device removal patch
> v1->v2:
>  - rebased
> ---
>  drivers/vdpa/vdpa_sim/vdpa_sim.c     |  3 +-
>  drivers/vdpa/vdpa_sim/vdpa_sim.h     |  2 +
>  drivers/vdpa/vdpa_sim/vdpa_sim_net.c | 96 ++++++++++++++++++++--------
>  3 files changed, 75 insertions(+), 26 deletions(-)
> 
> diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.c b/drivers/vdpa/vdpa_sim/vdpa_sim.c
> index db1636a99ba4..d5942842432d 100644
> --- a/drivers/vdpa/vdpa_sim/vdpa_sim.c
> +++ b/drivers/vdpa/vdpa_sim/vdpa_sim.c
> @@ -235,7 +235,7 @@ struct vdpasim *vdpasim_create(struct vdpasim_dev_attr *dev_attr)
>  		ops = &vdpasim_config_ops;
>  
>  	vdpasim = vdpa_alloc_device(struct vdpasim, vdpa, NULL, ops,
> -				    dev_attr->nvqs, NULL);
> +				    dev_attr->nvqs, dev_attr->name);
>  	if (!vdpasim)
>  		goto err_alloc;
>  
> @@ -249,6 +249,7 @@ struct vdpasim *vdpasim_create(struct vdpasim_dev_attr *dev_attr)
>  	if (dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64)))
>  		goto err_iommu;
>  	set_dma_ops(dev, &vdpasim_dma_ops);
> +	vdpasim->vdpa.mdev = dev_attr->mgmt_dev;
>  
>  	vdpasim->config = kzalloc(dev_attr->config_size, GFP_KERNEL);
>  	if (!vdpasim->config)
> diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.h b/drivers/vdpa/vdpa_sim/vdpa_sim.h
> index b02142293d5b..6d75444f9948 100644
> --- a/drivers/vdpa/vdpa_sim/vdpa_sim.h
> +++ b/drivers/vdpa/vdpa_sim/vdpa_sim.h
> @@ -33,6 +33,8 @@ struct vdpasim_virtqueue {
>  };
>  
>  struct vdpasim_dev_attr {
> +	struct vdpa_mgmt_dev *mgmt_dev;
> +	const char *name;
>  	u64 supported_features;
>  	size_t config_size;
>  	size_t buffer_size;
> diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim_net.c b/drivers/vdpa/vdpa_sim/vdpa_sim_net.c
> index f0482427186b..d344c5b7c914 100644
> --- a/drivers/vdpa/vdpa_sim/vdpa_sim_net.c
> +++ b/drivers/vdpa/vdpa_sim/vdpa_sim_net.c
> @@ -35,8 +35,6 @@ MODULE_PARM_DESC(macaddr, "Ethernet MAC address");
>  
>  static u8 macaddr_buf[ETH_ALEN];
>  
> -static struct vdpasim *vdpasim_net_dev;
> -
>  static void vdpasim_net_work(struct work_struct *work)
>  {
>  	struct vdpasim *vdpasim = container_of(work, struct vdpasim, work);
> @@ -120,21 +118,23 @@ static void vdpasim_net_get_config(struct vdpasim *vdpasim, void *config)
>  	memcpy(net_config->mac, macaddr_buf, ETH_ALEN);
>  }
>  
> -static int __init vdpasim_net_init(void)
> +static void vdpasim_net_mgmtdev_release(struct device *dev)
> +{
> +}
> +
> +static struct device vdpasim_net_mgmtdev = {
> +	.init_name = "vdpasim_net",
> +	.release = vdpasim_net_mgmtdev_release,
> +};
> +
> +static int vdpasim_net_dev_add(struct vdpa_mgmt_dev *mdev, const char *name)
>  {
>  	struct vdpasim_dev_attr dev_attr = {};
> +	struct vdpasim *simdev;
>  	int ret;
>  
> -	if (macaddr) {
> -		mac_pton(macaddr, macaddr_buf);
> -		if (!is_valid_ether_addr(macaddr_buf)) {
> -			ret = -EADDRNOTAVAIL;
> -			goto out;
> -		}
> -	} else {
> -		eth_random_addr(macaddr_buf);
> -	}
> -
> +	dev_attr.mgmt_dev = mdev;
> +	dev_attr.name = name;
>  	dev_attr.id = VIRTIO_ID_NET;
>  	dev_attr.supported_features = VDPASIM_NET_FEATURES;
>  	dev_attr.nvqs = VDPASIM_NET_VQ_NUM;
> @@ -143,29 +143,75 @@ static int __init vdpasim_net_init(void)
>  	dev_attr.work_fn = vdpasim_net_work;
>  	dev_attr.buffer_size = PAGE_SIZE;
>  
> -	vdpasim_net_dev = vdpasim_create(&dev_attr);
> -	if (IS_ERR(vdpasim_net_dev)) {
> -		ret = PTR_ERR(vdpasim_net_dev);
> -		goto out;
> +	simdev = vdpasim_create(&dev_attr);
> +	if (IS_ERR(simdev))
> +		return PTR_ERR(simdev);
> +
> +	ret = _vdpa_register_device(&simdev->vdpa);
> +	if (ret)
> +		goto reg_err;
> +
> +	return 0;
> +
> +reg_err:
> +	put_device(&simdev->vdpa.dev);
> +	return ret;
> +}
> +
> +static void vdpasim_net_dev_del(struct vdpa_mgmt_dev *mdev,
> +				struct vdpa_device *dev)
> +{
> +	struct vdpasim *simdev = container_of(dev, struct vdpasim, vdpa);
> +
> +	_vdpa_unregister_device(&simdev->vdpa);
> +}
> +
> +static const struct vdpa_mgmtdev_ops vdpasim_net_mgmtdev_ops = {
> +	.dev_add = vdpasim_net_dev_add,
> +	.dev_del = vdpasim_net_dev_del
> +};
> +
> +static struct virtio_device_id id_table[] = {
> +	{ VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID },
> +	{ 0 },
> +};
> +
> +static struct vdpa_mgmt_dev mgmt_dev = {
> +	.device = &vdpasim_net_mgmtdev,
> +	.id_table = id_table,
> +	.ops = &vdpasim_net_mgmtdev_ops,
> +};
> +
> +static int __init vdpasim_net_init(void)
> +{
> +	int ret;
> +
> +	if (macaddr) {
> +		mac_pton(macaddr, macaddr_buf);
> +		if (!is_valid_ether_addr(macaddr_buf))
> +			return -EADDRNOTAVAIL;
> +	} else {
> +		eth_random_addr(macaddr_buf);
>  	}

Hmm so all devices start out with the same MAC
until changed? And how is the change effected?


> -	ret = vdpa_register_device(&vdpasim_net_dev->vdpa);
> +	ret = device_register(&vdpasim_net_mgmtdev);
>  	if (ret)
> -		goto put_dev;
> +		return ret;
>  
> +	ret = vdpa_mgmtdev_register(&mgmt_dev);
> +	if (ret)
> +		goto parent_err;
>  	return 0;
>  
> -put_dev:
> -	put_device(&vdpasim_net_dev->vdpa.dev);
> -out:
> +parent_err:
> +	device_unregister(&vdpasim_net_mgmtdev);
>  	return ret;
>  }
>  
>  static void __exit vdpasim_net_exit(void)
>  {
> -	struct vdpa_device *vdpa = &vdpasim_net_dev->vdpa;
> -
> -	vdpa_unregister_device(vdpa);
> +	vdpa_mgmtdev_unregister(&mgmt_dev);
> +	device_unregister(&vdpasim_net_mgmtdev);
>  }
>  
>  module_init(vdpasim_net_init);
> -- 
> 2.26.2


  reply index

Thread overview: 79+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-12  6:39 [PATCH 0/7] Introduce vdpa management tool Parav Pandit
2020-11-12  6:39 ` [PATCH 1/7] vdpa: Add missing comment for virtqueue count Parav Pandit
2020-11-12  6:40 ` [PATCH 2/7] vdpa: Use simpler version of ida allocation Parav Pandit
2020-11-12  6:40 ` [PATCH 3/7] vdpa: Extend routine to accept vdpa device name Parav Pandit
2020-11-12  6:40 ` [PATCH 4/7] vdpa: Define vdpa parent device, ops and a netlink interface Parav Pandit
2020-11-12  6:40 ` [PATCH 5/7] vdpa: Enable a user to add and delete a vdpa device Parav Pandit
2020-11-12  6:40 ` [PATCH 6/7] vdpa: Enable user to query vdpa device info Parav Pandit
2020-11-12  6:40 ` [PATCH 7/7] vdpa/vdpa_sim: Enable user to create vdpasim net devices Parav Pandit
2020-11-16  9:41 ` [PATCH 0/7] Introduce vdpa management tool Stefan Hajnoczi
2020-11-17 19:41   ` Parav Pandit
2020-11-16 22:23 ` Jakub Kicinski
2020-11-17 19:51   ` Parav Pandit
2020-12-16  9:13     ` Michael S. Tsirkin
     [not found]       ` <20201216080610.08541f44@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
2020-12-16 16:54         ` Parav Pandit
2020-12-16 19:57           ` Michael S. Tsirkin
2020-12-17 12:13             ` Parav Pandit
2020-11-27  3:53 ` Jason Wang
     [not found]   ` <CACycT3sYScObb9nN3g7L3cesjE7sCZWxZ5_5R1usGU9ePZEeqA@mail.gmail.com>
2020-11-30  3:36     ` [External] " Jason Wang
2020-11-30  7:07       ` Yongji Xie
2020-12-01  6:25         ` Jason Wang
2020-12-01  9:55           ` Yongji Xie
2020-12-01 11:32             ` Parav Pandit
2020-12-01 14:18               ` Yongji Xie
2020-12-01 15:58                 ` Parav Pandit
2020-12-02  3:29                   ` Yongji Xie
2020-12-02  4:53                     ` Parav Pandit
2020-12-02  5:51                       ` Jason Wang
2020-12-02  6:24                         ` Parav Pandit
2020-12-02  7:55                           ` Jason Wang
2020-12-02  9:27                         ` Yongji Xie
2020-12-02  9:21                       ` Yongji Xie
2020-12-02 11:13                         ` Parav Pandit
2020-12-02 13:18                           ` Yongji Xie
2020-12-02  5:48             ` Jason Wang
2020-12-08 22:47   ` David Ahern
2021-01-19  4:21     ` Parav Pandit
2020-12-16  9:16 ` Michael S. Tsirkin
2021-01-04  3:31 ` [PATCH linux-next v2 " Parav Pandit
2021-01-04  3:31   ` [PATCH linux-next v2 1/7] vdpa_sim_net: Make mac address array static Parav Pandit
2021-01-04  7:00     ` Jason Wang
2021-01-04  3:31   ` [PATCH linux-next v2 2/7] vdpa_sim_net: Add module param to disable default vdpa net device Parav Pandit
2021-01-04  3:31   ` [PATCH linux-next v2 3/7] vdpa: Extend routine to accept vdpa device name Parav Pandit
2021-01-04  3:31   ` [PATCH linux-next v2 4/7] vdpa: Define vdpa mgmt device, ops and a netlink interface Parav Pandit
2021-01-04  7:03     ` Jason Wang
2021-01-04  7:24       ` Parav Pandit
2021-01-05  4:10         ` Jason Wang
2021-01-05  6:33           ` Parav Pandit
2021-01-05  8:36             ` Jason Wang
2021-01-04  3:31   ` [PATCH linux-next v2 5/7] vdpa: Enable a user to add and delete a vdpa device Parav Pandit
2021-01-04  3:31   ` [PATCH linux-next v2 6/7] vdpa: Enable user to query vdpa device info Parav Pandit
2021-01-04  3:31   ` [PATCH linux-next v2 7/7] vdpa_sim_net: Add support for user supported devices Parav Pandit
2021-01-04  7:05     ` Jason Wang
2021-01-04  7:21       ` Parav Pandit
2021-01-05  4:06         ` Jason Wang
2021-01-05  6:22           ` Parav Pandit
2021-01-05 10:31 ` [PATCH linux-next v3 0/6] Introduce vdpa management tool Parav Pandit
2021-01-05 10:31   ` [PATCH linux-next v3 1/6] vdpa_sim_net: Make mac address array static Parav Pandit
2021-01-07 13:45     ` Stefano Garzarella
2021-01-05 10:31   ` [PATCH linux-next v3 2/6] vdpa: Extend routine to accept vdpa device name Parav Pandit
2021-01-05 10:32   ` [PATCH linux-next v3 3/6] vdpa: Define vdpa mgmt device, ops and a netlink interface Parav Pandit
2021-01-05 10:32   ` [PATCH linux-next v3 4/6] vdpa: Enable a user to add and delete a vdpa device Parav Pandit
2021-01-05 10:32   ` [PATCH linux-next v3 5/6] vdpa: Enable user to query vdpa device info Parav Pandit
2021-01-05 10:32   ` [PATCH linux-next v3 6/6] vdpa_sim_net: Add support for user supported devices Parav Pandit
2021-01-05 11:48     ` Michael S. Tsirkin [this message]
2021-01-05 12:02       ` Parav Pandit
2021-01-05 12:14         ` Michael S. Tsirkin
2021-01-05 12:30           ` Parav Pandit
2021-01-05 13:23             ` Michael S. Tsirkin
2021-01-07  3:48               ` Parav Pandit
2021-01-12  4:14                 ` Parav Pandit
2021-01-14  4:17                 ` Jason Wang
2021-01-14  7:58                   ` Parav Pandit
2021-01-15  5:38                     ` Jason Wang
2021-01-15  6:27                       ` Parav Pandit
2021-01-19 11:09                         ` Jason Wang
2021-01-20  3:21                           ` Parav Pandit
2021-01-20  3:46                             ` Parav Pandit
2021-01-18 18:03                       ` Parav Pandit
2021-01-20  7:53                         ` Michael S. Tsirkin

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