[dpdk-dev] [PATCH v6 09/13] vhost: add API bind a virtq to a specific core

[Yuanhan Liu <yuanhan.liu@linux.intel.com>]

From: Changchun Ouyang <changchun.ouyang@intel.com>

The new API rte_vhost_core_id_set() is to bind a virtq to a specific
core, while the another API rte_vhost_core_id_get() is for getting
the bind core for a virtq.

The usage, which will be introduced soon, could be find at examles/vhost/main.c.

Signed-off-by: Changchun Ouyang <changchun.ouyang@intel.com>
Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
---
 lib/librte_vhost/rte_vhost_version.map |  7 +++++++
 lib/librte_vhost/rte_virtio_net.h      | 25 +++++++++++++++++++++++++
 lib/librte_vhost/virtio-net.c          | 25 +++++++++++++++++++++++++
 3 files changed, 57 insertions(+)

diff --git a/lib/librte_vhost/rte_vhost_version.map b/lib/librte_vhost/rte_vhost_version.map
index 3d8709e..2ce141c 100644
--- a/lib/librte_vhost/rte_vhost_version.map
+++ b/lib/librte_vhost/rte_vhost_version.map
@@ -18,5 +18,12 @@ DPDK_2.1 {
 	global:
 
 	rte_vhost_driver_unregister;
+} DPDK_2.0;
+
+
+DPDK_2.2 {
+	global:
 
+	rte_vhost_core_id_get;
+	rte_vhost_core_id_set;
 } DPDK_2.0;
diff --git a/lib/librte_vhost/rte_virtio_net.h b/lib/librte_vhost/rte_virtio_net.h
index fd87f01..3b75d18 100644
--- a/lib/librte_vhost/rte_virtio_net.h
+++ b/lib/librte_vhost/rte_virtio_net.h
@@ -90,6 +90,7 @@ struct vhost_virtqueue {
 	int			callfd;			/**< Used to notify the guest (trigger interrupt). */
 	int			kickfd;			/**< Currently unused as polling mode is enabled. */
 	int			enabled;
+	uint32_t		core_id;		/**< Data core that the vq is attached to */
 	struct buf_vector	buf_vec[BUF_VECTOR_MAX];	/**< for scatter RX. */
 } __rte_cache_aligned;
 
@@ -244,4 +245,28 @@ uint16_t rte_vhost_enqueue_burst(struct virtio_net *dev, uint16_t queue_id,
 uint16_t rte_vhost_dequeue_burst(struct virtio_net *dev, uint16_t queue_id,
 	struct rte_mempool *mbuf_pool, struct rte_mbuf **pkts, uint16_t count);
 
+/**
+ * This function get the data core id for queue pair in one vhost device.
+ * @param dev
+ *  virtio-net device
+ * @param queue_id
+ *  virtio queue index in mq case
+ * @return
+ *  core id of queue pair of specified virtio device.
+ */
+uint16_t rte_vhost_core_id_get(volatile struct virtio_net *dev,
+			       uint16_t queue_id);
+
+/**
+ * This function set the data core id for queue pair in one vhost device.
+ * @param dev
+ *  virtio-net device
+ * @param queue_id
+ *  virtio queue index in mq case
+ * @param core_id
+ *  data core id for virtio queue pair in mq case
+ */
+void rte_vhost_core_id_set(struct virtio_net *dev, uint16_t queue_id,
+			   uint16_t core_id);
+
 #endif /* _VIRTIO_NET_H_ */
diff --git a/lib/librte_vhost/virtio-net.c b/lib/librte_vhost/virtio-net.c
index b11fd61..d304ee6 100644
--- a/lib/librte_vhost/virtio-net.c
+++ b/lib/librte_vhost/virtio-net.c
@@ -868,6 +868,31 @@ int rte_vhost_feature_enable(uint64_t feature_mask)
 	return -1;
 }
 
+uint16_t
+rte_vhost_core_id_get(volatile struct virtio_net *dev, uint16_t queue_id)
+{
+	if (dev == NULL)
+		return 0;
+
+	if (dev->virtqueue == NULL || dev->virtqueue[queue_id] == NULL)
+		return 0;
+
+	return dev->virtqueue[queue_id]->core_id;
+}
+
+void
+rte_vhost_core_id_set(struct virtio_net *dev, uint16_t queue_id,
+		      uint16_t core_id)
+{
+	if (dev == NULL)
+		return;
+
+	if (dev->virtqueue == NULL || dev->virtqueue[queue_id] == NULL)
+		return;
+
+	dev->virtqueue[queue_id]->core_id = core_id;
+}
+
 /*
  * Register ops so that we can add/remove device to data core.
  */
-- 
1.9.0