ethdev: API for link up and down

This patch adds API to support the functionality of setting link up and down.
It can be used to repeatedly stop and restart RX/TX of a port without
re-allocating resources for the port and re-configuring the port.

Signed-off-by: Ouyang Changchun <changchun.ouyang@intel.com>
Tested-by: Waterman Cao <waterman.cao@intel.com>
Acked by: Ivan Boule <ivan.boule@6wind.com>

diff --git a/lib/librte_ether/rte_ethdev.c b/lib/librte_ether/rte_ethdev.c
index 25bbd9c..aac3478 100644 (file)
--- a/lib/librte_ether/rte_ethdev.c
+++ b/lib/librte_ether/rte_ethdev.c
@@ -814,6 +814,44 @@ rte_eth_dev_stop(uint8_t port_id)
        (*dev->dev_ops->dev_stop)(dev);
 }
 
+int
+rte_eth_dev_set_link_up(uint8_t port_id)
+{
+       struct rte_eth_dev *dev;
+
+       /* This function is only safe when called from the primary process
+        * in a multi-process setup*/
+       PROC_PRIMARY_OR_ERR_RET(-E_RTE_SECONDARY);
+
+       if (port_id >= nb_ports) {
+               PMD_DEBUG_TRACE("Invalid port_id=%d\n", port_id);
+               return -EINVAL;
+       }
+       dev = &rte_eth_devices[port_id];
+
+       FUNC_PTR_OR_ERR_RET(*dev->dev_ops->dev_set_link_up, -ENOTSUP);
+       return (*dev->dev_ops->dev_set_link_up)(dev);
+}
+
+int
+rte_eth_dev_set_link_down(uint8_t port_id)
+{
+       struct rte_eth_dev *dev;
+
+       /* This function is only safe when called from the primary process
+        * in a multi-process setup*/
+       PROC_PRIMARY_OR_ERR_RET(-E_RTE_SECONDARY);
+
+       if (port_id >= nb_ports) {
+               PMD_DEBUG_TRACE("Invalid port_id=%d\n", port_id);
+               return -EINVAL;
+       }
+       dev = &rte_eth_devices[port_id];
+
+       FUNC_PTR_OR_ERR_RET(*dev->dev_ops->dev_set_link_down, -ENOTSUP);
+       return (*dev->dev_ops->dev_set_link_down)(dev);
+}
+
 void
 rte_eth_dev_close(uint8_t port_id)
 {

diff --git a/lib/librte_ether/rte_ethdev.h b/lib/librte_ether/rte_ethdev.h
index f860601..6dc9c08 100644 (file)
--- a/lib/librte_ether/rte_ethdev.h
+++ b/lib/librte_ether/rte_ethdev.h
@@ -828,6 +828,12 @@ typedef int  (*eth_dev_start_t)(struct rte_eth_dev *dev);
 typedef void (*eth_dev_stop_t)(struct rte_eth_dev *dev);
 /**< @internal Function used to stop a configured Ethernet device. */
 
+typedef int  (*eth_dev_set_link_up_t)(struct rte_eth_dev *dev);
+/**< @internal Function used to link up a configured Ethernet device. */
+
+typedef int  (*eth_dev_set_link_down_t)(struct rte_eth_dev *dev);
+/**< @internal Function used to link down a configured Ethernet device. */
+
 typedef void (*eth_dev_close_t)(struct rte_eth_dev *dev);
 /**< @internal Function used to close a configured Ethernet device. */
 
@@ -1105,6 +1111,8 @@ struct eth_dev_ops {
        eth_dev_configure_t        dev_configure; /**< Configure device. */
        eth_dev_start_t            dev_start;     /**< Start device. */
        eth_dev_stop_t             dev_stop;      /**< Stop device. */
+       eth_dev_set_link_up_t      dev_set_link_up;   /**< Device link up. */
+       eth_dev_set_link_down_t    dev_set_link_down; /**< Device link down. */
        eth_dev_close_t            dev_close;     /**< Close device. */
        eth_promiscuous_enable_t   promiscuous_enable; /**< Promiscuous ON. */
        eth_promiscuous_disable_t  promiscuous_disable;/**< Promiscuous OFF. */
@@ -1569,6 +1577,32 @@ extern int rte_eth_dev_start(uint8_t port_id);
  */
 extern void rte_eth_dev_stop(uint8_t port_id);
 
+
+/**
+ * Link up an Ethernet device.
+ *
+ * Set device link up will re-enable the device rx/tx
+ * functionality after it is previously set device linked down.
+ *
+ * @param port_id
+ *   The port identifier of the Ethernet device.
+ * @return
+ *   - 0: Success, Ethernet device linked up.
+ *   - <0: Error code of the driver device link up function.
+ */
+extern int rte_eth_dev_set_link_up(uint8_t port_id);
+
+/**
+ * Link down an Ethernet device.
+ * The device rx/tx functionality will be disabled if success,
+ * and it can be re-enabled with a call to
+ * rte_eth_dev_set_link_up()
+ *
+ * @param port_id
+ *   The port identifier of the Ethernet device.
+ */
+extern int rte_eth_dev_set_link_down(uint8_t port_id);
+
 /**
  * Close an Ethernet device. The device cannot be restarted!
  *