From af8ececda185078c096852edb4e1d7a2349e6856 Mon Sep 17 00:00:00 2001 From: Viktor Prutyanov Date: Thu, 13 Apr 2023 11:18:54 +0300 Subject: virtio: add VIRTIO_F_NOTIFICATION_DATA feature support 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 Acked-by: Jason Wang Reviewed-by: Xuan Zhuo Message-Id: <20230413081855.36643-2-alvaro.karsz@solid-run.com> Signed-off-by: Michael S. Tsirkin --- include/linux/virtio_ring.h | 2 ++ include/uapi/linux/virtio_config.h | 6 ++++++ 2 files changed, 8 insertions(+) (limited to 'include') diff --git a/include/linux/virtio_ring.h b/include/linux/virtio_ring.h index 8b95b69ef694..2550c9170f4f 100644 --- a/include/linux/virtio_ring.h +++ b/include/linux/virtio_ring.h @@ -117,4 +117,6 @@ void vring_del_virtqueue(struct virtqueue *vq); void vring_transport_features(struct virtio_device *vdev); irqreturn_t vring_interrupt(int irq, void *_vq); + +u32 vring_notification_data(struct virtqueue *_vq); #endif /* _LINUX_VIRTIO_RING_H */ diff --git a/include/uapi/linux/virtio_config.h b/include/uapi/linux/virtio_config.h index 3c05162bc988..2c712c654165 100644 --- a/include/uapi/linux/virtio_config.h +++ b/include/uapi/linux/virtio_config.h @@ -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. */ -- cgit