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Change vdpa_device.nvqs and vhost_vdpa.nvqs to use u32
Signed-off-by: Longpeng <longpeng2@huawei.com>
Link: https://lore.kernel.org/r/20220315032553.455-3-longpeng2@huawei.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Longpeng <<a href="mailto:longpeng2@huawei.com" target="_blank">longpeng2@huawei.com</a>><br></blockquote><div><br></div><div>Acked-by: Jason Wang <<a href="mailto:jasowang@redhat.com">jasowang@redhat.com</a>></div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
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- GET_CONFIG_SIZE: return the size of the virtio config space.
The size contains the fields which are conditional on feature
bits.
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Longpeng <longpeng2@huawei.com>
Link: https://lore.kernel.org/r/20220315032553.455-2-longpeng2@huawei.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
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No functional change introduced. vdpa bus driver such as virtio_vdpa
or vhost_vdpa is not supposed to take care of the locking for core
by its own. The locked API vdpa_set_features should suffice the
bus driver's need.
Signed-off-by: Si-Wei Liu <si-wei.liu@oracle.com>
Reviewed-by: Eli Cohen <elic@nvidia.com>
Link: https://lore.kernel.org/r/1642206481-30721-2-git-send-email-si-wei.liu@oracle.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
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Avoid the wrapper holding cf_mutex since it is not protecting anything.
To avoid confusion and unnecessary overhead incurred by it, remove.
Fixes: f489f27bc0ab ("vdpa: Sync calls set/get config/status with cf_mutex")
Signed-off-by: Eli Cohen <elic@nvidia.com>
Link: https://lore.kernel.org/r/20220111183400.38418-2-elic@nvidia.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Si-Wei Liu<si-wei.liu@oracle.com>
Acked-by: Jason Wang <jasowang@redhat.com>
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Add max_supported_vqs and supported_features fields to struct
vdpa_mgmt_dev. Upstream drivers need to feel these values according to
the device capabilities.
These values are reported back in a netlink message when showing management
devices.
Examples:
$ auxiliary/mlx5_core.sf.1:
supported_classes net
max_supported_vqs 257
dev_features CSUM GUEST_CSUM MTU HOST_TSO4 HOST_TSO6 STATUS CTRL_VQ MQ \
CTRL_MAC_ADDR VERSION_1 ACCESS_PLATFORM
$ vdpa -j mgmtdev show
{"mgmtdev":{"auxiliary/mlx5_core.sf.1":{"supported_classes":["net"], \
"max_supported_vqs":257,"dev_features":["CSUM","GUEST_CSUM","MTU", \
"HOST_TSO4","HOST_TSO6","STATUS","CTRL_VQ","MQ","CTRL_MAC_ADDR", \
"VERSION_1","ACCESS_PLATFORM"]}}}
$ vdpa -jp mgmtdev show
{
"mgmtdev": {
"auxiliary/mlx5_core.sf.1": {
"supported_classes": [ "net" ],
"max_supported_vqs": 257,
"dev_features": ["CSUM","GUEST_CSUM","MTU","HOST_TSO4", \
"HOST_TSO6","STATUS","CTRL_VQ","MQ", \
"CTRL_MAC_ADDR","VERSION_1","ACCESS_PLATFORM"]
}
}
}
Signed-off-by: Eli Cohen <elic@nvidia.com>
Link: https://lore.kernel.org/r/20220105114646.577224-11-elic@nvidia.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Si-Wei Liu<si-wei.liu@oracle.com>
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Add netlink support to configure the max virtqueue pairs for a device.
At least one pair is required. The maximum is dictated by the device.
Example:
$ vdpa dev add name vdpa-a mgmtdev auxiliary/mlx5_core.sf.1 max_vqp 4
Signed-off-by: Eli Cohen <elic@nvidia.com>
Link: https://lore.kernel.org/r/20220105114646.577224-6-elic@nvidia.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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Add wrappers to get/set status and protect these operations with
cf_mutex to serialize these operations with respect to get/set config
operations.
Signed-off-by: Eli Cohen <elic@nvidia.com>
Link: https://lore.kernel.org/r/20220105114646.577224-4-elic@nvidia.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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Provide an interface to read the negotiated features. This is needed
when building the netlink message in vdpa_dev_net_config_fill().
Also fix the implementation of vdpa_dev_net_config_fill() to use the
negotiated features instead of the device features.
To make APIs clearer, make the following name changes to struct
vdpa_config_ops so they better describe their operations:
get_features -> get_device_features
set_features -> set_driver_features
Finally, add get_driver_features to return the negotiated features and
add implementation to all the upstream drivers.
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Eli Cohen <elic@nvidia.com>
Link: https://lore.kernel.org/r/20220105114646.577224-2-elic@nvidia.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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Since vhost_vdpa_mmap checks for its existence before calling it.
Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Link: https://lore.kernel.org/r/20211104195248.2088904-1-eperezma@redhat.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
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`driver_override` allows to control which of the vDPA bus drivers
binds to a vDPA device.
If `driver_override` is not set, the previous behaviour is followed:
devices use the first vDPA bus driver loaded (unless auto binding
is disabled).
Tested on Fedora 34 with driverctl(8):
$ modprobe virtio-vdpa
$ modprobe vhost-vdpa
$ modprobe vdpa-sim-net
$ vdpa dev add mgmtdev vdpasim_net name dev1
# dev1 is attached to the first vDPA bus driver loaded
$ driverctl -b vdpa list-devices
dev1 virtio_vdpa
$ driverctl -b vdpa set-override dev1 vhost_vdpa
$ driverctl -b vdpa list-devices
dev1 vhost_vdpa [*]
Note: driverctl(8) integrates with udev so the binding is
preserved.
Suggested-by: Jason Wang <jasowang@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Link: https://lore.kernel.org/r/20211126164753.181829-3-sgarzare@redhat.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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$ vdpa dev add name bar mgmtdev vdpasim_net mac 00:11:22:33:44:55 mtu 9000
$ vdpa dev config show
bar: mac 00:11:22:33:44:55 link up link_announce false mtu 9000
$ vdpa dev config show -jp
{
"config": {
"bar": {
"mac": "00:11:22:33:44:55",
"link ": "up",
"link_announce ": false,
"mtu": 9000,
}
}
}
Signed-off-by: Parav Pandit <parav@nvidia.com>
Reviewed-by: Eli Cohen <elic@nvidia.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Link: https://lore.kernel.org/r/20211026175519.87795-5-parav@nvidia.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
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As subsequent patch adds new structure field with comment, move the
structure comment to follow kernel coding style.
Signed-off-by: Parav Pandit <parav@nvidia.com>
Reviewed-by: Eli Cohen <elic@nvidia.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Link: https://lore.kernel.org/r/20211026175519.87795-4-parav@nvidia.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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Introduce a command to query a device config layout.
An example query of network vdpa device:
$ vdpa dev add name bar mgmtdev vdpasim_net
$ vdpa dev config show
bar: mac 00:35:09:19:48:05 link up link_announce false mtu 1500
$ vdpa dev config show -jp
{
"config": {
"bar": {
"mac": "00:35:09:19:48:05",
"link ": "up",
"link_announce ": false,
"mtu": 1500,
}
}
}
Signed-off-by: Parav Pandit <parav@nvidia.com>
Signed-off-by: Eli Cohen <elic@nvidia.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Link: https://lore.kernel.org/r/20211026175519.87795-3-parav@nvidia.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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Subsequent patches enable get and set configuration either
via management device or via vdpa device' config ops.
This requires synchronization between multiple callers to get and set
config callbacks. Features setting also influence the layout of the
configuration fields endianness.
To avoid exposing synchronization primitives to callers, introduce
helper for setting the configuration and use it.
Signed-off-by: Parav Pandit <parav@nvidia.com>
Reviewed-by: Eli Cohen <elic@nvidia.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Link: https://lore.kernel.org/r/20211026175519.87795-2-parav@nvidia.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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This callback is optional. For vdpa devices that not support to change
virtqueue size, get_vq_num_min and get_vq_num_max will return the same
value, so that users can choose a correct value for that device.
Suggested-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Wu Zongyong <wuzongyong@linux.alibaba.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Link: https://lore.kernel.org/r/f4af5b0abd660d9a29ab6b2f67bd6df10284a230.1635493219.git.wuzongyong@linux.alibaba.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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Signed-off-by: Wu Zongyong <wuzongyong@linux.alibaba.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Link: https://lore.kernel.org/r/4b5153262e4ba64986bb567d7425ad4829ca7bcc.1635493219.git.wuzongyong@linux.alibaba.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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This patch introduces an attribute for vDPA device to indicate
whether virtual address can be used. If vDPA device driver set
it, vhost-vdpa bus driver will not pin user page and transfer
userspace virtual address instead of physical address during
DMA mapping. And corresponding vma->vm_file and offset will be
also passed as an opaque pointer.
Suggested-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Xie Yongji <xieyongji@bytedance.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Link: https://lore.kernel.org/r/20210831103634.33-11-xieyongji@bytedance.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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Add an opaque pointer for DMA mapping.
Suggested-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Xie Yongji <xieyongji@bytedance.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Link: https://lore.kernel.org/r/20210831103634.33-9-xieyongji@bytedance.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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This adds a new callback to support device specific reset
behavior. The vdpa bus driver will call the reset function
instead of setting status to zero during resetting.
Signed-off-by: Xie Yongji <xieyongji@bytedance.com>
Link: https://lore.kernel.org/r/20210831103634.33-6-xieyongji@bytedance.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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Fix some code indent issues and following checkpatch warning:
WARNING: Prefer 'unsigned int' to bare use of 'unsigned'
371: FILE: include/linux/vdpa.h:371:
+static inline void vdpa_get_config(struct vdpa_device *vdev, unsigned offset,
Signed-off-by: Xie Yongji <xieyongji@bytedance.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Link: https://lore.kernel.org/r/20210831103634.33-5-xieyongji@bytedance.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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The return value of vdpa_alloc_device() macro is not very
clear, so that most of callers did the wrong check. Let's
add some comments to better document it.
Signed-off-by: Xie Yongji <xieyongji@bytedance.com>
Link: https://lore.kernel.org/r/20210715080026.242-4-xieyongji@bytedance.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
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This patch extends the vdpa_vq_state to support packed virtqueue
state which is basically the device/driver ring wrap counters and the
avail and used index. This will be used for the virito-vdpa support
for the packed virtqueue and the future vhost/vhost-vdpa support for
the packed virtqueue.
Signed-off-by: Jason Wang <jasowang@redhat.com>
Link: https://lore.kernel.org/r/20210602021536.39525-2-jasowang@redhat.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Eli Cohen <elic@nvidia.com>
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This new callback is used to get the size of the configuration space
of vDPA devices.
Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Link: https://lore.kernel.org/r/20210315163450.254396-9-sgarzare@redhat.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
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Follow comment style mentioned in the Writing kernel-doc document [1].
Following warnings are fixed.
$ scripts/kernel-doc -v -none include/linux/vdpa.h
include/linux/vdpa.h:11: warning: missing initial short description on line:
* vDPA callback definition.
include/linux/vdpa.h:11: info: Scanning doc for vDPA
include/linux/vdpa.h:15: warning: cannot understand function prototype: 'struct vdpa_callback '
include/linux/vdpa.h:21: warning: missing initial short description on line:
* vDPA notification area
include/linux/vdpa.h:21: info: Scanning doc for vDPA
include/linux/vdpa.h:25: warning: cannot understand function prototype: 'struct vdpa_notification_area '
include/linux/vdpa.h:31: warning: missing initial short description on line:
* vDPA vq_state definition
include/linux/vdpa.h:31: info: Scanning doc for vDPA
include/linux/vdpa.h:34: warning: cannot understand function prototype: 'struct vdpa_vq_state '
include/linux/vdpa.h:41: info: Scanning doc for vDPA device
include/linux/vdpa.h:51: warning: cannot understand function prototype: 'struct vdpa_device '
include/linux/vdpa.h:62: info: Scanning doc for vDPA IOVA range
include/linux/vdpa.h:66: warning: cannot understand function prototype: 'struct vdpa_iova_range '
include/linux/vdpa.h:72: info: Scanning doc for vDPA_config_ops
include/linux/vdpa.h:203: warning: cannot understand function prototype: 'struct vdpa_config_ops '
include/linux/vdpa.h:270: info: Scanning doc for vdpa_driver
include/linux/vdpa.h:275: warning: cannot understand function prototype: 'struct vdpa_driver '
include/linux/vdpa.h:347: info: Scanning doc for vdpa_mgmtdev_ops
include/linux/vdpa.h:360: warning: cannot understand function prototype: 'struct vdpa_mgmtdev_ops '
After this fix:
scripts/kernel-doc -v -none include/linux/vdpa.h
include/linux/vdpa.h:11: info: Scanning doc for struct vdpa_calllback
include/linux/vdpa.h:21: info: Scanning doc for struct vdpa_notification_area
include/linux/vdpa.h:31: info: Scanning doc for struct vdpa_vq_state
include/linux/vdpa.h:41: info: Scanning doc for struct vdpa_device
include/linux/vdpa.h:62: info: Scanning doc for struct vdpa_iova_range
include/linux/vdpa.h:72: info: Scanning doc for struct vdpa_config_ops
include/linux/vdpa.h:270: info: Scanning doc for struct vdpa_driver
include/linux/vdpa.h:347: info: Scanning doc for struct vdpa_mgmtdev_ops
[1] https://www.kernel.org/doc/html/latest/doc-guide/kernel-doc.html
Signed-off-by: Parav Pandit <parav@nvidia.com>
Reviewed-by: Eli Cohen <elic@nvidia.com>
Link: https://lore.kernel.org/r/20210406170457.98481-2-parav@nvidia.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
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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 <sgarzare@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Link: https://lore.kernel.org/r/20210223061905.422659-3-jasowang@redhat.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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Add the ability to add and delete a vdpa device.
Examples:
Create a vdpa device of type network named "foo2" from
the management device vdpasim:
$ vdpa dev add mgmtdev vdpasim_net name foo2
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>
Reviewed-by: Jason Wang <jasowang@redhat.com>
Link: https://lore.kernel.org/r/20210105103203.82508-5-parav@nvidia.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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To add one or more VDPA devices, define a management device which
allows adding or removing vdpa device. A management device defines
set of callbacks to manage vdpa devices.
To begin with, it defines add and remove callbacks through which a user
defined vdpa device can be added or removed.
A unique management device is identified by its unique handle identified
by management device name and optionally the bus name.
Hence, introduce routine through which driver can register a
management device and its callback operations for adding and remove
a vdpa device.
Introduce vdpa netlink socket family so that user can query management
device and its attributes.
Example of show vdpa management device which allows creating vdpa device of
networking class (device id = 0x1) of virtio specification 1.1
section 5.1.1.
$ vdpa mgmtdev show
vdpasim_net:
supported_classes:
net
Example of showing vdpa management device in JSON format.
$ vdpa mgmtdev show -jp
{
"show": {
"vdpasim_net": {
"supported_classes": [ "net" ]
}
}
}
Signed-off-by: Parav Pandit <parav@nvidia.com>
Reviewed-by: Eli Cohen <elic@nvidia.com>
Reviewed-by: Jason Wang <jasowang@redhat.com>
Link: https://lore.kernel.org/r/20210105103203.82508-4-parav@nvidia.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Including a bugfix:
vpda: correctly size vdpa_nl_policy
We need to ensure last entry of vdpa_nl_policy[]
is zero, otherwise out-of-bounds access is hurting us.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: syzbot <syzkaller@googlegroups.com>
Cc: Parav Pandit <parav@nvidia.com>
Cc: Eli Cohen <elic@nvidia.com>
Cc: Jason Wang <jasowang@redhat.com>
Cc: Michael S. Tsirkin <mst@redhat.com>
Link: https://lore.kernel.org/r/20210210134911.4119555-1-eric.dumazet@gmail.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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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 <parav@nvidia.com>
Reviewed-by: Eli Cohen <elic@nvidia.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Link: https://lore.kernel.org/r/20210105103203.82508-3-parav@nvidia.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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Add missing comment for number of virtqueue.
Signed-off-by: Parav Pandit <parav@nvidia.com>
Reviewed-by: Eli Cohen <elic@nvidia.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Link: https://lore.kernel.org/r/20201112064005.349268-2-parav@nvidia.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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This patch introduce a config op to get valid iova range from the vDPA
device.
Signed-off-by: Jason Wang <jasowang@redhat.com>
Link: https://lore.kernel.org/r/20201023090043.14430-2-jasowang@redhat.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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Modify get_vq_state() so it returns an error code. In case of hardware
acceleration, the available index may be retrieved from the device, an
operation that can possibly fail.
Reviewed-by: Parav Pandit <parav@mellanox.com>
Signed-off-by: Eli Cohen <eli@mellanox.com>
Link: https://lore.kernel.org/r/20200804162048.22587-9-eli@mellanox.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
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For now VQ state involves 16 bit available index value encoded in u64
variable. In the future it will be extended to contain more fields. Use
struct to contain the state, now containing only a single u16 for the
available index. In the future we can add fields to this struct.
Reviewed-by: Parav Pandit <parav@mellanox.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Eli Cohen <eli@mellanox.com>
Link: https://lore.kernel.org/r/20200804162048.22587-8-eli@mellanox.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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This will enable vdpa providers to add support for multi queue feature
and publish it to upper layers (vhost and virtio).
Signed-off-by: Max Gurtovoy <maxg@mellanox.com>
Reviewed-by: Jason Wang <jasowang@redhat.com>
Link: https://lore.kernel.org/r/20200804162048.22587-7-eli@mellanox.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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IRQ of a vq is not expected to be changed in a DRIVER_OK ~ !DRIVER_OK
period for irq offloading purposes. Place this comment at the side of
bus ops get_vq_irq than in set_status in vhost_vdpa.
Signed-off-by: Zhu Lingshan <lingshan.zhu@intel.com>
Link: https://lore.kernel.org/r/20200804102123.69978-1-lingshan.zhu@intel.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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This commit adds a new function get_vq_irq() in struct
vdpa_config_ops, which will return the irq number of a
virtqueue.
Signed-off-by: Zhu Lingshan <lingshan.zhu@intel.com>
Suggested-by: Jason Wang <jasowang@redhat.com>
Link: https://lore.kernel.org/r/20200731065533.4144-4-lingshan.zhu@intel.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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Some legacy guests just assume features are 0 after reset.
We detect that config space is accessed before features are
set and set features to 0 automatically.
Note: some legacy guests might not even access config space, if this is
reported in the field we might need to catch a kick to handle these.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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This patch introduces a new method in the vdpa_config_ops which
reports the physical address and the size of the doorbell for a
specific virtqueue.
This will be used by the future patches that maps doorbell to
userspace.
Signed-off-by: Jason Wang <jasowang@redhat.com>
Link: https://lore.kernel.org/r/20200529080303.15449-4-jasowang@redhat.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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get_vq_align returns u16 now, but that's not enough for
systems/devices with 64K pages. All callers assign it to
a u32 variable anyway, so let's just change the return
value type to u32.
Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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vDPA device is a device that uses a datapath which complies with the
virtio specifications with vendor specific control path. vDPA devices
can be both physically located on the hardware or emulated by
software. vDPA hardware devices are usually implemented through PCIE
with the following types:
- PF (Physical Function) - A single Physical Function
- VF (Virtual Function) - Device that supports single root I/O
virtualization (SR-IOV). Its Virtual Function (VF) represents a
virtualized instance of the device that can be assigned to different
partitions
- ADI (Assignable Device Interface) and its equivalents - With
technologies such as Intel Scalable IOV, a virtual device (VDEV)
composed by host OS utilizing one or more ADIs. Or its equivalent
like SF (Sub function) from Mellanox.
>From a driver's perspective, depends on how and where the DMA
translation is done, vDPA devices are split into two types:
- Platform specific DMA translation - From the driver's perspective,
the device can be used on a platform where device access to data in
memory is limited and/or translated. An example is a PCIE vDPA whose
DMA request was tagged via a bus (e.g PCIE) specific way. DMA
translation and protection are done at PCIE bus IOMMU level.
- Device specific DMA translation - The device implements DMA
isolation and protection through its own logic. An example is a vDPA
device which uses on-chip IOMMU.
To hide the differences and complexity of the above types for a vDPA
device/IOMMU options and in order to present a generic virtio device
to the upper layer, a device agnostic framework is required.
This patch introduces a software vDPA bus which abstracts the
common attributes of vDPA device, vDPA bus driver and the
communication method (vdpa_config_ops) between the vDPA device
abstraction and the vDPA bus driver. This allows multiple types of
drivers to be used for vDPA device like the virtio_vdpa and vhost_vdpa
driver to operate on the bus and allow vDPA device could be used by
either kernel virtio driver or userspace vhost drivers as:
virtio drivers vhost drivers
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[virtio bus] [vhost uAPI]
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virtio device vhost device
virtio_vdpa drv vhost_vdpa drv
\ /
[vDPA bus]
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vDPA device
hardware drv
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[hardware bus]
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vDPA hardware
With the abstraction of vDPA bus and vDPA bus operations, the
difference and complexity of the under layer hardware is hidden from
upper layer. The vDPA bus drivers on top can use a unified
vdpa_config_ops to control different types of vDPA device.
Signed-off-by: Jason Wang <jasowang@redhat.com>
Link: https://lore.kernel.org/r/20200326140125.19794-6-jasowang@redhat.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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