[dpdk-dev] [PATCH v3 13/21] vhost: add helpers for packed virtqueues
Jens Freimann
jfreimann at redhat.com
Fri Apr 6 11:21:35 CEST 2018
On Fri, Apr 06, 2018 at 11:20:10AM +0200, Maxime Coquelin wrote:
>
>
>On 04/05/2018 12:10 PM, Jens Freimann wrote:
>>Add some helper functions to set/check descriptor flags
>>and toggle the used wrap counter.
>>
>>Signed-off-by: Jens Freimann <jfreimann at redhat.com>
>>---
>> lib/librte_vhost/virtio-1.1.h | 44 +++++++++++++++++++++++++++++++++++++++++++
>> 1 file changed, 44 insertions(+)
>>
>>diff --git a/lib/librte_vhost/virtio-1.1.h b/lib/librte_vhost/virtio-1.1.h
>>index 7b48caed7..e77d7aa6c 100644
>>--- a/lib/librte_vhost/virtio-1.1.h
>>+++ b/lib/librte_vhost/virtio-1.1.h
>Shouldn't the file be named virtio-packed.h?
yes, will rename it.
>>@@ -15,4 +15,48 @@ struct vring_desc_packed {
>> uint16_t flags;
>> };
>>+static inline void
>>+toggle_wrap_counter(struct vhost_virtqueue *vq)
>>+{
>>+ vq->used_wrap_counter ^= 1;
>>+}
>>+
>>+static inline int
>>+desc_is_avail(struct vhost_virtqueue *vq, struct vring_desc_packed *desc)
>>+{
>>+ if (vq->used_wrap_counter == 1) {
>>+ if ((desc->flags & VRING_DESC_F_AVAIL) &&
>>+ !(desc->flags & VRING_DESC_F_USED))
>>+ return 1;
>>+ }
>>+ if (vq->used_wrap_counter == 0) {
>>+ if (!(desc->flags & VRING_DESC_F_AVAIL) &&
>>+ (desc->flags & VRING_DESC_F_USED))
>>+ return 1;
>>+ }
>>+ return 0;
>>+}
>>+
>>+static inline void
>>+_set_desc_used(struct vring_desc_packed *desc, int wrap_counter)
>>+{
>>+ uint16_t flags = desc->flags;
>>+
>>+ if (wrap_counter == 1) {
>>+ flags |= VRING_DESC_F_USED;
>>+ flags |= VRING_DESC_F_AVAIL;
>>+ } else {
>>+ flags &= ~VRING_DESC_F_USED;
>>+ flags &= ~VRING_DESC_F_AVAIL;
>>+ }
>>+
>>+ desc->flags = flags;
>>+}
>>+
>>+static inline void
>>+set_desc_used(struct vhost_virtqueue *vq, struct vring_desc_packed *desc)
>>+{
>>+ _set_desc_used(desc, vq->used_wrap_counter);
>>+}
>>+
>
>Maybe prefix all with vring_
>> #endif /* __VIRTIO_PACKED_H */
ok
Thanks!
regards,
Jens
>>
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