From: Huawei Xie <huawei.xie@intel.com>
Date: Wed, 8 Oct 2014 18:54:51 +0000 (+0800)
Subject: vhost: get available vring entries
X-Git-Tag: spdx-start~10290
X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=7202b0a8240158b317665c20525f81d55f16f602;p=dpdk.git

vhost: get available vring entries

Signed-off-by: Huawei Xie <huawei.xie@intel.com>
Acked-by: Changchun Ouyang <changchun.ouyang@intel.com>
[Thomas: split patch]
---

diff --git a/lib/librte_vhost/rte_virtio_net.h b/lib/librte_vhost/rte_virtio_net.h
index 0e9c4735a9..73423dde03 100644
--- a/lib/librte_vhost/rte_virtio_net.h
+++ b/lib/librte_vhost/rte_virtio_net.h
@@ -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.