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Date: Tue, 5 Jan 2021 06:48:58 -0500
From: "Michael S. Tsirkin" <mst@...hat.com>
To: Parav Pandit <parav@...dia.com>
Cc: virtualization@...ts.linux-foundation.org, jasowang@...hat.com,
elic@...dia.com, netdev@...r.kernel.org
Subject: Re: [PATCH linux-next v3 6/6] vdpa_sim_net: Add support for user
supported devices
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@...dia.com>
> Reviewed-by: Eli Cohen <elic@...dia.com>
> Acked-by: Jason Wang <jasowang@...hat.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
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