net/vhost: retrieve vid for a given port

In some cases when using the vHost PMD, certain vHost library functions
may still need to be accessed. One such example is the
rte_vhost_get_queue_num function which returns the number of virtqueues
reported by the guest - information which is not exposed by the PMD.

This commit introduces a new rte_eth_vhost function that returns the
'vid' associated with a given port id. This allows the PMD user to call
vHost library functions which require the 'vid' value.

Signed-off-by: Ciara Loftus <ciara.loftus@intel.com>
Acked-by: John McNamara <john.mcnamara@intel.com>
Acked-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>

diff --git a/drivers/net/vhost/rte_eth_vhost.c b/drivers/net/vhost/rte_eth_vhost.c
index 1c41613..1e80fd2 100644 (file)
--- a/drivers/net/vhost/rte_eth_vhost.c
+++ b/drivers/net/vhost/rte_eth_vhost.c
@@ -428,6 +428,35 @@ rte_eth_vhost_get_queue_event(uint8_t port_id,
        return -1;
 }
 
+int
+rte_eth_vhost_get_vid_from_port_id(uint8_t port_id)
+{
+       struct internal_list *list;
+       struct rte_eth_dev *eth_dev;
+       struct vhost_queue *vq;
+       int vid = -1;
+
+       if (!rte_eth_dev_is_valid_port(port_id))
+               return -1;
+
+       pthread_mutex_lock(&internal_list_lock);
+
+       TAILQ_FOREACH(list, &internal_list, next) {
+               eth_dev = list->eth_dev;
+               if (eth_dev->data->port_id == port_id) {
+                       vq = eth_dev->data->rx_queues[0];
+                       if (vq) {
+                               vid = vq->vid;
+                       }
+                       break;
+               }
+       }
+
+       pthread_mutex_unlock(&internal_list_lock);
+
+       return vid;
+}
+
 static void *
 vhost_driver_session(void *param __rte_unused)
 {

diff --git a/drivers/net/vhost/rte_eth_vhost.h b/drivers/net/vhost/rte_eth_vhost.h
index ff5d877..7c98b1a 100644 (file)
--- a/drivers/net/vhost/rte_eth_vhost.h
+++ b/drivers/net/vhost/rte_eth_vhost.h
@@ -102,6 +102,15 @@ struct rte_eth_vhost_queue_event {
 int rte_eth_vhost_get_queue_event(uint8_t port_id,
                struct rte_eth_vhost_queue_event *event);
 
+/**
+ * Get the 'vid' value associated with the specified port.
+ *
+ * @return
+ *  - On success, the 'vid' associated with 'port_id'.
+ *  - On failure, a negative value.
+ */
+int rte_eth_vhost_get_vid_from_port_id(uint8_t port_id);
+
 #ifdef __cplusplus
 }
 #endif

diff --git a/drivers/net/vhost/rte_pmd_vhost_version.map b/drivers/net/vhost/rte_pmd_vhost_version.map
index 65bf3a8..3d44083 100644 (file)
--- a/drivers/net/vhost/rte_pmd_vhost_version.map
+++ b/drivers/net/vhost/rte_pmd_vhost_version.map
@@ -8,3 +8,9 @@ DPDK_16.04 {
 
        local: *;
 };
+
+DPDK_16.11 {
+       global:
+
+       rte_eth_vhost_get_vid_from_port_id;
+};