[dpdk-dev] [PATCH v3 10/20] vhost: introduce new API to export ifname

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

Introduce a new API rte_vhost_get_ifname() to export the ifname to
application.

Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
Tested-by: Rich Lane <rich.lane@bigswitch.com>
Acked-by: Rich Lane <rich.lane@bigswitch.com>
---
 drivers/net/vhost/rte_eth_vhost.c      | 12 ++++++++----
 lib/librte_vhost/rte_vhost_version.map |  1 +
 lib/librte_vhost/rte_virtio_net.h      | 17 +++++++++++++++++
 lib/librte_vhost/virtio-net.c          | 16 ++++++++++++++++
 4 files changed, 42 insertions(+), 4 deletions(-)

diff --git a/drivers/net/vhost/rte_eth_vhost.c b/drivers/net/vhost/rte_eth_vhost.c
index fe0ce90..6fa9f6b 100644
--- a/drivers/net/vhost/rte_eth_vhost.c
+++ b/drivers/net/vhost/rte_eth_vhost.c
@@ -229,6 +229,7 @@ new_device(struct virtio_net *dev)
 	struct pmd_internal *internal;
 	struct vhost_queue *vq;
 	unsigned i;
+	char ifname[PATH_MAX];
 #ifdef RTE_LIBRTE_VHOST_NUMA
 	int newnode;
 #endif
@@ -238,9 +239,10 @@ new_device(struct virtio_net *dev)
 		return -1;
 	}
 
-	list = find_internal_resource(dev->ifname);
+	rte_vhost_get_ifname(dev->vid, ifname, sizeof(ifname));
+	list = find_internal_resource(ifname);
 	if (list == NULL) {
-		RTE_LOG(INFO, PMD, "Invalid device name\n");
+		RTE_LOG(INFO, PMD, "Invalid device name: %s\n", ifname);
 		return -1;
 	}
 
@@ -360,15 +362,17 @@ vring_state_changed(struct virtio_net *dev, uint16_t vring, int enable)
 	struct rte_vhost_vring_state *state;
 	struct rte_eth_dev *eth_dev;
 	struct internal_list *list;
+	char ifname[PATH_MAX];
 
 	if (dev == NULL) {
 		RTE_LOG(ERR, PMD, "Invalid argument\n");
 		return -1;
 	}
 
-	list = find_internal_resource(dev->ifname);
+	rte_vhost_get_ifname(dev->vid, ifname, sizeof(ifname));
+	list = find_internal_resource(ifname);
 	if (list == NULL) {
-		RTE_LOG(ERR, PMD, "Invalid interface name: %s\n", dev->ifname);
+		RTE_LOG(ERR, PMD, "Invalid interface name: %s\n", ifname);
 		return -1;
 	}
 
diff --git a/lib/librte_vhost/rte_vhost_version.map b/lib/librte_vhost/rte_vhost_version.map
index a65fa21..4608e3b 100644
--- a/lib/librte_vhost/rte_vhost_version.map
+++ b/lib/librte_vhost/rte_vhost_version.map
@@ -24,6 +24,7 @@ DPDK_2.1 {
 DPDK_16.07 {
 	global:
 
+	rte_vhost_get_ifname;
 	rte_vhost_get_numa_node;
 	rte_vhost_get_queue_num;
 
diff --git a/lib/librte_vhost/rte_virtio_net.h b/lib/librte_vhost/rte_virtio_net.h
index de56b1b..0898e8b 100644
--- a/lib/librte_vhost/rte_virtio_net.h
+++ b/lib/librte_vhost/rte_virtio_net.h
@@ -268,6 +268,23 @@ int rte_vhost_get_numa_node(int vid);
 uint32_t rte_vhost_get_queue_num(int vid);
 
 /**
+ * Get the virtio net device's ifname. For vhost-cuse, ifname is the
+ * path of the char device. For vhost-user, ifname is the vhost-user
+ * socket file path.
+ *
+ * @param vid
+ *  virtio-net device ID
+ * @param buf
+ *  The buffer to stored the queried ifname
+ * @param len
+ *  The length of buf
+ *
+ * @return
+ *  0 on success, -1 on failure
+ */
+int rte_vhost_get_ifname(int vid, char *buf, size_t len);
+
+/**
  * This function adds buffers to the virtio devices RX virtqueue. Buffers can
  * be received from the physical port or from another virtual device. A packet
  * count is returned to indicate the number of packets that were succesfully
diff --git a/lib/librte_vhost/virtio-net.c b/lib/librte_vhost/virtio-net.c
index a03ff30..375c9d4 100644
--- a/lib/librte_vhost/virtio-net.c
+++ b/lib/librte_vhost/virtio-net.c
@@ -767,6 +767,22 @@ rte_vhost_get_queue_num(int vid)
 	return dev->virt_qp_nb;
 }
 
+int
+rte_vhost_get_ifname(int vid, char *buf, size_t len)
+{
+	struct virtio_net *dev = get_device(vid);
+
+	if (dev == NULL)
+		return -1;
+
+	len = RTE_MIN(len, sizeof(dev->ifname));
+
+	strncpy(buf, dev->ifname, len);
+	buf[len - 1] = '\0';
+
+	return 0;
+}
+
 int rte_vhost_enable_guest_notification(struct virtio_net *dev,
 	uint16_t queue_id, int enable)
 {
-- 
1.9.0