lwn.git/drivers/vdpa/vdpa_sim/vdpa_sim.c, branch v5.12-rc5

vdpa: set the virtqueue num during register

2021-02-25T19:26:00+00:00

This patch delay the queue number setting to vDPA device registering. This allows us to probe the virtqueue numbers between device allocation and registering. Reviewed-by: Stefano Garzarella Signed-off-by: Jason Wang Link: https://lore.kernel.org/r/20210223061905.422659-3-jasowang@redhat.com Signed-off-by: Michael S. Tsirkin

vdpa_sim_net: Add support for user supported devices

2021-02-23T12:52:56+00:00

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 } } } Delete the vdpa device after its use: $ vdpa dev del foo2 Signed-off-by: Parav Pandit Reviewed-by: Eli Cohen Acked-by: Jason Wang Link: https://lore.kernel.org/r/20210105103203.82508-7-parav@nvidia.com Signed-off-by: Michael S. Tsirkin

vdpa: Extend routine to accept vdpa device name

2021-02-23T12:52:56+00:00

In a subsequent patch, when user initiated command creates a vdpa device, the user chooses the name of the vdpa device. To support it, extend the device allocation API to consider this name specified by the caller driver. Signed-off-by: Parav Pandit Reviewed-by: Eli Cohen Acked-by: Jason Wang Link: https://lore.kernel.org/r/20210105103203.82508-3-parav@nvidia.com Signed-off-by: Michael S. Tsirkin

vdpa: split vdpasim to core and net modules

2020-12-18T21:14:30+00:00

Introduce new vdpa_sim_net and vdpa_sim (core) drivers. This is a preparation for adding a vdpa simulator module for block devices. Signed-off-by: Max Gurtovoy [sgarzare: various cleanups/fixes] Acked-by: Jason Wang Signed-off-by: Stefano Garzarella Link: https://lore.kernel.org/r/20201215144256.155342-19-sgarzare@redhat.com Signed-off-by: Michael S. Tsirkin

vdpa_sim: split vdpasim_virtqueue's iov field in out_iov and in_iov

2020-12-18T21:14:30+00:00

vringh_getdesc_iotlb() manages 2 iovs for writable and readable descriptors. This is very useful for the block device, where for each request we have both types of descriptor. Let's split the vdpasim_virtqueue's iov field in out_iov and in_iov to use them with vringh_getdesc_iotlb(). We are using VIRTIO terminology for "out" (readable by the device) and "in" (writable by the device) descriptors. Acked-by: Jason Wang Signed-off-by: Stefano Garzarella Link: https://lore.kernel.org/r/20201215144256.155342-18-sgarzare@redhat.com Signed-off-by: Michael S. Tsirkin

vdpa_sim: make vdpasim->buffer size configurable

2020-12-18T21:14:30+00:00

Allow each device to specify the size of the buffer allocated in vdpa_sim. Acked-by: Jason Wang Signed-off-by: Stefano Garzarella Link: https://lore.kernel.org/r/20201215144256.155342-17-sgarzare@redhat.com Signed-off-by: Michael S. Tsirkin

vdpa_sim: use kvmalloc to allocate vdpasim->buffer

2020-12-18T21:14:29+00:00

The next patch will make the buffer size configurable from each device. Since the buffer could be larger than a page, we use kvmalloc() instead of kmalloc(). Acked-by: Jason Wang Signed-off-by: Stefano Garzarella Link: https://lore.kernel.org/r/20201215144256.155342-16-sgarzare@redhat.com Signed-off-by: Michael S. Tsirkin

vdpa_sim: set vringh notify callback

2020-12-18T21:14:29+00:00

Instead of calling the vq callback directly, we can leverage the vringh_notify() function, adding vdpasim_vq_notify() and setting it in the vringh notify callback. Suggested-by: Jason Wang Acked-by: Jason Wang Signed-off-by: Stefano Garzarella Link: https://lore.kernel.org/r/20201215144256.155342-15-sgarzare@redhat.com Signed-off-by: Michael S. Tsirkin

vdpa_sim: add set_config callback in vdpasim_dev_attr

2020-12-18T21:14:29+00:00

The set_config callback can be used by the device to parse the config structure modified by the driver. The callback will be invoked, if set, in vdpasim_set_config() after copying bytes from caller buffer into vdpasim->config buffer. Acked-by: Jason Wang Signed-off-by: Stefano Garzarella Link: https://lore.kernel.org/r/20201215144256.155342-14-sgarzare@redhat.com Signed-off-by: Michael S. Tsirkin

vdpa_sim: add get_config callback in vdpasim_dev_attr

2020-12-18T21:14:29+00:00

The get_config callback can be used by the device to fill the config structure. The callback will be invoked in vdpasim_get_config() before copying bytes into caller buffer. Move vDPA-net config updates from vdpasim_set_features() in the new vdpasim_net_get_config() callback. This is safe since in vdpa_get_config() we already check that .set_features() callback is called before .get_config(). Signed-off-by: Stefano Garzarella Link: https://lore.kernel.org/r/20201215144256.155342-13-sgarzare@redhat.com Signed-off-by: Michael S. Tsirkin