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vhost: get available vring entries

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Signed-off-by: Huawei Xie <huawei.xie@intel.com>
Acked-by: Changchun Ouyang <changchun.ouyang@intel.com>
[Thomas: split patch]
This commit is contained in:
Huawei Xie 2014-10-09 02:54:51 +08:00 committed by Thomas Monjalon
parent 28689ff04d
commit 7202b0a824
1 changed files with 6 additions and 0 deletions
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6
lib/librte_vhost/rte_virtio_net.h
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@ -119,6 +119,12 @@ struct virtio_net_device_ops {
void (* destroy_device) (volatile struct virtio_net *); /* Remove device. */
};
static inline uint16_t __attribute__((always_inline))
rte_vring_available_entries(struct virtio_net *dev, uint16_t queue_id)
{
struct vhost_virtqueue *vq = dev->virtqueue[queue_id];
return *(volatile uint16_t *)&vq->avail->idx - vq->last_used_idx_res;
}
/**
* Function to convert guest physical addresses to vhost virtual addresses.