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virtio: add VIRTIO_F_NOTIFICATION_DATA feature support

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According to VirtIO spec v1.2, VIRTIO_F_NOTIFICATION_DATA feature
indicates that the driver passes extra data along with the queue
notifications.

In a split queue case, the extra data is 16-bit available index. In a
packed queue case, the extra data is 1-bit wrap counter and 15-bit
available index.

Add support for this feature for MMIO, channel I/O and modern PCI
transports.

Signed-off-by: Viktor Prutyanov <viktor@daynix.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Message-Id: <20230413081855.36643-2-alvaro.karsz@solid-run.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Viktor Prutyanov
2023-04-13 11:18:54 +03:00
committed by Michael S. Tsirkin
parent 3616bf377a
commit af8ececda1
6 changed files with 79 additions and 5 deletions
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6
include/uapi/linux/virtio_config.h
View File

@@ -99,6 +99,12 @@
*/
#define VIRTIO_F_SR_IOV 37
/*
* This feature indicates that the driver passes extra data (besides
* identifying the virtqueue) in its device notifications.
*/
#define VIRTIO_F_NOTIFICATION_DATA 38
/*
* This feature indicates that the driver can reset a queue individually.
*/