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| author | Michael S. Tsirkin <mst@redhat.com> | 2011-05-20 01:10:54 +0200 |
|---|---|---|
| committer | Rusty Russell <rusty@rustcorp.com.au> | 2011-05-30 03:44:15 +0200 |
| commit | 8ea8cf89e19aeb596b818ee5f2bec8a8b0586b60 (patch) | |
| tree | 3303edab83f45265f2e9d05a5ef59f67e758b5f7 /drivers/vhost/vhost.h | |
| parent | virtio_ring: support event idx feature (diff) | |
| download | linux-8ea8cf89e19aeb596b818ee5f2bec8a8b0586b60.tar.xz linux-8ea8cf89e19aeb596b818ee5f2bec8a8b0586b60.zip | |
vhost: support event index
Support the new event index feature. When acked,
utilize it to reduce the # of interrupts sent to the guest.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'drivers/vhost/vhost.h')
| -rw-r--r-- | drivers/vhost/vhost.h | 21 |
1 files changed, 14 insertions, 7 deletions
diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h index b3363ae38518..8e03379dd30f 100644 --- a/drivers/vhost/vhost.h +++ b/drivers/vhost/vhost.h @@ -84,6 +84,12 @@ struct vhost_virtqueue { /* Used flags */ u16 used_flags; + /* Last used index value we have signalled on */ + u16 signalled_used; + + /* Last used index value we have signalled on */ + bool signalled_used_valid; + /* Log writes to used structure. */ bool log_used; u64 log_addr; @@ -149,8 +155,8 @@ void vhost_add_used_and_signal(struct vhost_dev *, struct vhost_virtqueue *, void vhost_add_used_and_signal_n(struct vhost_dev *, struct vhost_virtqueue *, struct vring_used_elem *heads, unsigned count); void vhost_signal(struct vhost_dev *, struct vhost_virtqueue *); -void vhost_disable_notify(struct vhost_virtqueue *); -bool vhost_enable_notify(struct vhost_virtqueue *); +void vhost_disable_notify(struct vhost_dev *, struct vhost_virtqueue *); +bool vhost_enable_notify(struct vhost_dev *, struct vhost_virtqueue *); int vhost_log_write(struct vhost_virtqueue *vq, struct vhost_log *log, unsigned int log_num, u64 len); @@ -162,11 +168,12 @@ int vhost_log_write(struct vhost_virtqueue *vq, struct vhost_log *log, } while (0) enum { - VHOST_FEATURES = (1 << VIRTIO_F_NOTIFY_ON_EMPTY) | - (1 << VIRTIO_RING_F_INDIRECT_DESC) | - (1 << VHOST_F_LOG_ALL) | - (1 << VHOST_NET_F_VIRTIO_NET_HDR) | - (1 << VIRTIO_NET_F_MRG_RXBUF), + VHOST_FEATURES = (1ULL << VIRTIO_F_NOTIFY_ON_EMPTY) | + (1ULL << VIRTIO_RING_F_INDIRECT_DESC) | + (1ULL << VIRTIO_RING_F_EVENT_IDX) | + (1ULL << VHOST_F_LOG_ALL) | + (1ULL << VHOST_NET_F_VIRTIO_NET_HDR) | + (1ULL << VIRTIO_NET_F_MRG_RXBUF), }; static inline int vhost_has_feature(struct vhost_dev *dev, int bit) |