Displaying 20 results from an estimated 121 matches for "wrap_count".
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2018 May 16
2
[RFC v4 4/5] virtio_ring: add event idx support in packed ring
...rs/virtio/virtio_ring.c
> @@ -1006,7 +1006,7 @@ static inline int virtqueue_add_packed(struct virtqueue *_vq,
> static bool virtqueue_kick_prepare_packed(struct virtqueue *_vq)
> {
> struct vring_virtqueue *vq = to_vvq(_vq);
> - u16 flags;
> + u16 new, old, off_wrap, flags, wrap_counter, event_idx;
> bool needs_kick;
> u32 snapshot;
>
> @@ -1015,9 +1015,19 @@ static bool virtqueue_kick_prepare_packed(struct virtqueue *_vq)
> * suppressions. */
> virtio_mb(vq->weak_barriers);
>
> + old = vq->next_avail_idx - vq->num_added;
>...
2018 May 16
2
[RFC v4 4/5] virtio_ring: add event idx support in packed ring
...rs/virtio/virtio_ring.c
> @@ -1006,7 +1006,7 @@ static inline int virtqueue_add_packed(struct virtqueue *_vq,
> static bool virtqueue_kick_prepare_packed(struct virtqueue *_vq)
> {
> struct vring_virtqueue *vq = to_vvq(_vq);
> - u16 flags;
> + u16 new, old, off_wrap, flags, wrap_counter, event_idx;
> bool needs_kick;
> u32 snapshot;
>
> @@ -1015,9 +1015,19 @@ static bool virtqueue_kick_prepare_packed(struct virtqueue *_vq)
> * suppressions. */
> virtio_mb(vq->weak_barriers);
>
> + old = vq->next_avail_idx - vq->num_added;
>...
2018 May 16
0
[RFC v4 4/5] virtio_ring: add event idx support in packed ring
.../virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -1006,7 +1006,7 @@ static inline int virtqueue_add_packed(struct virtqueue *_vq,
static bool virtqueue_kick_prepare_packed(struct virtqueue *_vq)
{
struct vring_virtqueue *vq = to_vvq(_vq);
- u16 flags;
+ u16 new, old, off_wrap, flags, wrap_counter, event_idx;
bool needs_kick;
u32 snapshot;
@@ -1015,9 +1015,19 @@ static bool virtqueue_kick_prepare_packed(struct virtqueue *_vq)
* suppressions. */
virtio_mb(vq->weak_barriers);
+ old = vq->next_avail_idx - vq->num_added;
+ new = vq->next_avail_idx;
+ vq->num_added =...
2018 May 02
2
[RFC v3 4/5] virtio_ring: add event idx support in packed ring
...before
> + * the read in the next get_buf call. */
> + if (vq->event_flags_shadow == VRING_EVENT_F_DESC)
> + virtio_store_mb(vq->weak_barriers,
> + &vq->vring_packed.driver->off_wrap,
> + cpu_to_virtio16(_vq->vdev, vq->last_used_idx |
> + (vq->wrap_counter << 15)));
> +
> #ifdef DEBUG
> vq->last_add_time_valid = false;
> #endif
> @@ -1143,10 +1160,17 @@ static unsigned virtqueue_enable_cb_prepare_packed(struct virtqueue *_vq)
>
> /* We optimistically turn back on interrupts, then check if there was
>...
2018 May 02
2
[RFC v3 4/5] virtio_ring: add event idx support in packed ring
...before
> + * the read in the next get_buf call. */
> + if (vq->event_flags_shadow == VRING_EVENT_F_DESC)
> + virtio_store_mb(vq->weak_barriers,
> + &vq->vring_packed.driver->off_wrap,
> + cpu_to_virtio16(_vq->vdev, vq->last_used_idx |
> + (vq->wrap_counter << 15)));
> +
> #ifdef DEBUG
> vq->last_add_time_valid = false;
> #endif
> @@ -1143,10 +1160,17 @@ static unsigned virtqueue_enable_cb_prepare_packed(struct virtqueue *_vq)
>
> /* We optimistically turn back on interrupts, then check if there was
>...
2018 May 02
2
[RFC v3 4/5] virtio_ring: add event idx support in packed ring
...need_event() cares is the distance between
> `new` and `old`, i.e. vq->num_added. So I think there
> is nothing wrong with `old`. But the calculation of the
> distance between `new` and `event_idx` isn't right when
> `new` wraps. How do you think about the below code:
>
> wrap_counter = off_wrap >> 15;
> event_idx = off_wrap & ~(1<<15);
> if (wrap_counter != vq->wrap_counter)
> event_idx -= vq->vring_packed.num;
>
> needs_kick = vring_need_event(event_idx, new, old);
I suspect this hack won't work for non power of 2 ring.
>...
2018 May 02
2
[RFC v3 4/5] virtio_ring: add event idx support in packed ring
...need_event() cares is the distance between
> `new` and `old`, i.e. vq->num_added. So I think there
> is nothing wrong with `old`. But the calculation of the
> distance between `new` and `event_idx` isn't right when
> `new` wraps. How do you think about the below code:
>
> wrap_counter = off_wrap >> 15;
> event_idx = off_wrap & ~(1<<15);
> if (wrap_counter != vq->wrap_counter)
> event_idx -= vq->vring_packed.num;
>
> needs_kick = vring_need_event(event_idx, new, old);
I suspect this hack won't work for non power of 2 ring.
>...
2018 May 02
2
[RFC v3 4/5] virtio_ring: add event idx support in packed ring
...ew` and `old`, i.e. vq->num_added. So I think there
> > > is nothing wrong with `old`. But the calculation of the
> > > distance between `new` and `event_idx` isn't right when
> > > `new` wraps. How do you think about the below code:
> > >
> > > wrap_counter = off_wrap >> 15;
> > > event_idx = off_wrap & ~(1<<15);
> > > if (wrap_counter != vq->wrap_counter)
> > > event_idx -= vq->vring_packed.num;
> > >
> > > needs_kick = vring_need_event(event_idx, new, old);
> >
> &...
2018 May 02
2
[RFC v3 4/5] virtio_ring: add event idx support in packed ring
...ew` and `old`, i.e. vq->num_added. So I think there
> > > is nothing wrong with `old`. But the calculation of the
> > > distance between `new` and `event_idx` isn't right when
> > > `new` wraps. How do you think about the below code:
> > >
> > > wrap_counter = off_wrap >> 15;
> > > event_idx = off_wrap & ~(1<<15);
> > > if (wrap_counter != vq->wrap_counter)
> > > event_idx -= vq->vring_packed.num;
> > >
> > > needs_kick = vring_need_event(event_idx, new, old);
> >
> &...
2018 Oct 12
2
[PATCH net-next V2 6/8] vhost: packed ring support
...ong vhost_vring_ioctl(struct vhost_dev *d, unsigned int ioctl, void __user *arg
> vq->last_avail_idx = s.num;
> /* Forget the cached index value. */
> vq->avail_idx = vq->last_avail_idx;
> + if (vhost_has_feature(vq, VIRTIO_F_RING_PACKED)) {
> + vq->last_avail_wrap_counter = wrap_counter;
> + vq->avail_wrap_counter = vq->last_avail_wrap_counter;
> + }
> break;
> case VHOST_GET_VRING_BASE:
> s.index = idx;
> s.num = vq->last_avail_idx;
> + if (vhost_has_feature(vq, VIRTIO_F_RING_PACKED))
> + s.num |= vq->last_avai...
2018 Oct 12
2
[PATCH net-next V2 6/8] vhost: packed ring support
...ong vhost_vring_ioctl(struct vhost_dev *d, unsigned int ioctl, void __user *arg
> vq->last_avail_idx = s.num;
> /* Forget the cached index value. */
> vq->avail_idx = vq->last_avail_idx;
> + if (vhost_has_feature(vq, VIRTIO_F_RING_PACKED)) {
> + vq->last_avail_wrap_counter = wrap_counter;
> + vq->avail_wrap_counter = vq->last_avail_wrap_counter;
> + }
> break;
> case VHOST_GET_VRING_BASE:
> s.index = idx;
> s.num = vq->last_avail_idx;
> + if (vhost_has_feature(vq, VIRTIO_F_RING_PACKED))
> + s.num |= vq->last_avai...
2018 May 03
2
[RFC v3 4/5] virtio_ring: add event idx support in packed ring
...here
> > > > > is nothing wrong with `old`. But the calculation of the
> > > > > distance between `new` and `event_idx` isn't right when
> > > > > `new` wraps. How do you think about the below code:
> > > > >
> > > > > wrap_counter = off_wrap >> 15;
> > > > > event_idx = off_wrap & ~(1<<15);
> > > > > if (wrap_counter != vq->wrap_counter)
> > > > > event_idx -= vq->vring_packed.num;
> > > > >
> > > > > needs_kick = vring_...
2018 May 03
2
[RFC v3 4/5] virtio_ring: add event idx support in packed ring
...here
> > > > > is nothing wrong with `old`. But the calculation of the
> > > > > distance between `new` and `event_idx` isn't right when
> > > > > `new` wraps. How do you think about the below code:
> > > > >
> > > > > wrap_counter = off_wrap >> 15;
> > > > > event_idx = off_wrap & ~(1<<15);
> > > > > if (wrap_counter != vq->wrap_counter)
> > > > > event_idx -= vq->vring_packed.num;
> > > > >
> > > > > needs_kick = vring_...
2018 Sep 07
1
[PATCH net-next v2 4/5] virtio_ring: add event idx support in packed ring
...ivers/virtio/virtio_ring.c
> @@ -1050,7 +1050,7 @@ static inline int virtqueue_add_packed(struct virtqueue *_vq,
> static bool virtqueue_kick_prepare_packed(struct virtqueue *_vq)
> {
> struct vring_virtqueue *vq = to_vvq(_vq);
> - u16 flags;
> + u16 new, old, off_wrap, flags, wrap_counter, event_idx;
> bool needs_kick;
> u32 snapshot;
>
> @@ -1059,9 +1059,19 @@ static bool virtqueue_kick_prepare_packed(struct virtqueue *_vq)
> * suppressions. */
> virtio_mb(vq->weak_barriers);
>
> + old = vq->next_avail_idx - vq->num_added;
> + new...
2018 May 16
0
[RFC v4 4/5] virtio_ring: add event idx support in packed ring
...? 16:37, Tiwei Bie wrote:
[...]
> > @@ -1160,15 +1186,27 @@ static void virtqueue_disable_cb_packed(struct virtqueue *_vq)
> > static unsigned virtqueue_enable_cb_prepare_packed(struct virtqueue *_vq)
> > {
> > struct vring_virtqueue *vq = to_vvq(_vq);
> > + u16 wrap_counter;
> > START_USE(vq);
> > /* We optimistically turn back on interrupts, then check if there was
> > * more to do. */
> > + /* Depending on the VIRTIO_RING_F_USED_EVENT_IDX feature, we need to
> > + * either clear the flags bit or point the event index at the...
2018 May 16
1
[RFC v3 4/5] virtio_ring: add event idx support in packed ring
...before
> + * the read in the next get_buf call. */
> + if (vq->event_flags_shadow == VRING_EVENT_F_DESC)
> + virtio_store_mb(vq->weak_barriers,
> + &vq->vring_packed.driver->off_wrap,
> + cpu_to_virtio16(_vq->vdev, vq->last_used_idx |
> + (vq->wrap_counter << 15)));
> +
> #ifdef DEBUG
> vq->last_add_time_valid = false;
> #endif
> @@ -1143,10 +1160,17 @@ static unsigned virtqueue_enable_cb_prepare_packed(struct virtqueue *_vq)
>
> /* We optimistically turn back on interrupts, then check if there was
>...
2018 Oct 15
2
[PATCH net-next V2 6/8] vhost: packed ring support
...unsigned int ioctl, void __user *arg
>>> vq->last_avail_idx = s.num;
>>> /* Forget the cached index value. */
>>> vq->avail_idx = vq->last_avail_idx;
>>> + if (vhost_has_feature(vq, VIRTIO_F_RING_PACKED)) {
>>> + vq->last_avail_wrap_counter = wrap_counter;
>>> + vq->avail_wrap_counter = vq->last_avail_wrap_counter;
>>> + }
>>> break;
>>> case VHOST_GET_VRING_BASE:
>>> s.index = idx;
>>> s.num = vq->last_avail_idx;
>>> + if (vhost_has_feature(v...
2018 Oct 15
2
[PATCH net-next V2 6/8] vhost: packed ring support
...unsigned int ioctl, void __user *arg
>>> vq->last_avail_idx = s.num;
>>> /* Forget the cached index value. */
>>> vq->avail_idx = vq->last_avail_idx;
>>> + if (vhost_has_feature(vq, VIRTIO_F_RING_PACKED)) {
>>> + vq->last_avail_wrap_counter = wrap_counter;
>>> + vq->avail_wrap_counter = vq->last_avail_wrap_counter;
>>> + }
>>> break;
>>> case VHOST_GET_VRING_BASE:
>>> s.index = idx;
>>> s.num = vq->last_avail_idx;
>>> + if (vhost_has_feature(v...
2018 Apr 13
3
[RFC v2] virtio: support packed ring
...t; +{
> > + struct vring_virtqueue *vq = to_vvq(_vq);
> > + struct vring_packed_desc *desc;
> > + struct scatterlist *sg;
> > + unsigned int i, n, descs_used, uninitialized_var(prev), err_idx;
> > + __virtio16 uninitialized_var(head_flags), flags;
> > + int head, wrap_counter;
> > + bool indirect;
> > +
> > + START_USE(vq);
> > +
> > + BUG_ON(data == NULL);
> > + BUG_ON(ctx && vq->indirect);
> > +
> > + if (unlikely(vq->broken)) {
> > + END_USE(vq);
> > + return -EIO;
> > + }
> > +...
2018 Apr 13
3
[RFC v2] virtio: support packed ring
...t; +{
> > + struct vring_virtqueue *vq = to_vvq(_vq);
> > + struct vring_packed_desc *desc;
> > + struct scatterlist *sg;
> > + unsigned int i, n, descs_used, uninitialized_var(prev), err_idx;
> > + __virtio16 uninitialized_var(head_flags), flags;
> > + int head, wrap_counter;
> > + bool indirect;
> > +
> > + START_USE(vq);
> > +
> > + BUG_ON(data == NULL);
> > + BUG_ON(ctx && vq->indirect);
> > +
> > + if (unlikely(vq->broken)) {
> > + END_USE(vq);
> > + return -EIO;
> > + }
> > +...