vhost: export interface name

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>

diff --git a/drivers/net/vhost/rte_eth_vhost.c b/drivers/net/vhost/rte_eth_vhost.c
index bbd76b1..5c1690d 100644 (file)
--- 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 a65bef5..d12ac97 100644 (file)
--- 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 (file)
--- a/lib/librte_vhost/rte_virtio_net.h
+++ b/lib/librte_vhost/rte_virtio_net.h
@@ -267,6 +267,23 @@ 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

diff --git a/lib/librte_vhost/virtio-net.c b/lib/librte_vhost/virtio-net.c
index a03ff30..375c9d4 100644 (file)
--- 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)
 {