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virtio-pci: Introduce admin command sending function

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Add support for sending admin command through admin virtqueue interface.
Abort any inflight admin commands once device reset completes. Activate
admin queue when device becomes ready; deactivate on device reset.

To comply to the below specification statement [1], the admin virtqueue
is activated for upper layer users only after setting DRIVER_OK status.

[1] The driver MUST NOT send any buffer available notifications to the
device before setting DRIVER_OK.

Signed-off-by: Feng Liu <feliu@nvidia.com>
Reviewed-by: Parav Pandit <parav@nvidia.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Yishai Hadas <yishaih@nvidia.com>
Link: https://lore.kernel.org/r/20231219093247.170936-4-yishaih@nvidia.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Feng Liu
2023-12-19 11:32:41 +02:00
committed by Alex Williamson
parent fd27ef6b44
commit 92792ac752
4 changed files with 177 additions and 2 deletions
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22
include/uapi/linux/virtio_pci.h
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@@ -223,4 +223,26 @@ struct virtio_pci_cfg_cap {
#endif /* VIRTIO_PCI_NO_MODERN */
/* Admin command status. */
#define VIRTIO_ADMIN_STATUS_OK 0
struct __packed virtio_admin_cmd_hdr {
__le16 opcode;
/*
* 1 - SR-IOV
* 2-65535 - reserved
*/
__le16 group_type;
/* Unused, reserved for future extensions. */
__u8 reserved1[12];
__le64 group_member_id;
};
struct __packed virtio_admin_cmd_status {
__le16 status;
__le16 status_qualifier;
/* Unused, reserved for future extensions. */
__u8 reserved2[4];
};
#endif