ethdev: allow unknown link speed

When querying the link information, the link status is
a mandatory major information.
Other boolean values are supposed to be accurate:
	- duplex mode (half/full)
	- negotiation (auto/fixed)

This API update is making explicit that the link speed information
is optional.
The value ETH_SPEED_NUM_NONE (0) was already part of the API.
The value ETH_SPEED_NUM_UNKNOWN (infinite) is added to cover
two different cases:
	- speed is not known by the driver
	- device is virtual

Suggested-by: Morten Brørup <mb@smartsharesystems.com>
Suggested-by: Benoit Ganne <bganne@cisco.com>
Signed-off-by: Thomas Monjalon <thomas@monjalon.net>
Reviewed-by: Ferruh Yigit <ferruh.yigit@intel.com>

diff --git a/lib/librte_ethdev/rte_ethdev.h b/lib/librte_ethdev/rte_ethdev.h
index 70295d7..f30245b 100644 (file)
--- a/lib/librte_ethdev/rte_ethdev.h
+++ b/lib/librte_ethdev/rte_ethdev.h
@@ -303,6 +303,7 @@ struct rte_eth_stats {
 #define ETH_SPEED_NUM_56G      56000 /**<  56 Gbps */
 #define ETH_SPEED_NUM_100G    100000 /**< 100 Gbps */
 #define ETH_SPEED_NUM_200G    200000 /**< 200 Gbps */
+#define ETH_SPEED_NUM_UNKNOWN UINT32_MAX /**< Unknown */
 
 /**
  * A structure used to retrieve link-level information of an Ethernet port.
@@ -2374,15 +2375,16 @@ int rte_eth_allmulticast_disable(uint16_t port_id);
 int rte_eth_allmulticast_get(uint16_t port_id);
 
 /**
- * Retrieve the status (ON/OFF), the speed (in Mbps) and the mode (HALF-DUPLEX
- * or FULL-DUPLEX) of the physical link of an Ethernet device. It might need
- * to wait up to 9 seconds in it.
+ * Retrieve the link status (up/down), the duplex mode (half/full),
+ * the negotiation (auto/fixed), and if available, the speed (Mbps).
+ *
+ * It might need to wait up to 9 seconds.
+ * @see rte_eth_link_get_nowait.
  *
  * @param port_id
  *   The port identifier of the Ethernet device.
  * @param link
- *   A pointer to an *rte_eth_link* structure to be filled with
- *   the status, the speed and the mode of the Ethernet device link.
+ *   Link information written back.
  * @return
  *   - (0) if successful.
  *   - (-ENOTSUP) if the function is not supported in PMD driver.
@@ -2391,15 +2393,13 @@ int rte_eth_allmulticast_get(uint16_t port_id);
 int rte_eth_link_get(uint16_t port_id, struct rte_eth_link *link);
 
 /**
- * Retrieve the status (ON/OFF), the speed (in Mbps) and the mode (HALF-DUPLEX
- * or FULL-DUPLEX) of the physical link of an Ethernet device. It is a no-wait
- * version of rte_eth_link_get().
+ * Retrieve the link status (up/down), the duplex mode (half/full),
+ * the negotiation (auto/fixed), and if available, the speed (Mbps).
  *
  * @param port_id
  *   The port identifier of the Ethernet device.
  * @param link
- *   A pointer to an *rte_eth_link* structure to be filled with
- *   the status, the speed and the mode of the Ethernet device link.
+ *   Link information written back.
  * @return
  *   - (0) if successful.
  *   - (-ENOTSUP) if the function is not supported in PMD driver.