From bc355ebf4f7b1810fc732c3c02010a75ff486842 Mon Sep 17 00:00:00 2001
From: Intel <intel.com>
Date: Mon, 3 Jun 2013 00:00:00 +0000
Subject: [PATCH] ethdev: retrieve RX available descriptors

Signed-off-by: Intel
---
 lib/librte_ether/rte_ethdev.c | 14 ++++++++++++++
 lib/librte_ether/rte_ethdev.h | 18 ++++++++++++++++++
 2 files changed, 32 insertions(+)

diff --git a/lib/librte_ether/rte_ethdev.c b/lib/librte_ether/rte_ethdev.c
index 06fc25106b..f7535c828d 100644
--- a/lib/librte_ether/rte_ethdev.c
+++ b/lib/librte_ether/rte_ethdev.c
@@ -1649,6 +1649,20 @@ rte_eth_tx_burst(uint8_t port_id, uint16_t queue_id,
 	return (*dev->tx_pkt_burst)(dev->data->tx_queues[queue_id],
 						tx_pkts, nb_pkts);
 }
+
+uint32_t
+rte_eth_rx_queue_count(uint8_t port_id, uint16_t queue_id)
+{
+	struct rte_eth_dev *dev;
+
+	if (port_id >= nb_ports) {
+		PMD_DEBUG_TRACE("Invalid port_id=%d\n", port_id);
+		return 0;
+	}
+	dev = &rte_eth_devices[port_id];
+	FUNC_PTR_OR_ERR_RET(*dev->dev_ops->rx_queue_count, -ENOTSUP);
+	return (*dev->dev_ops->rx_queue_count)(dev, queue_id);	
+}
 #endif
 
 int
diff --git a/lib/librte_ether/rte_ethdev.h b/lib/librte_ether/rte_ethdev.h
index 74b3a5b60b..64a2d57c61 100644
--- a/lib/librte_ether/rte_ethdev.h
+++ b/lib/librte_ether/rte_ethdev.h
@@ -754,6 +754,10 @@ typedef int (*eth_tx_queue_setup_t)(struct rte_eth_dev *dev,
 typedef void (*eth_queue_release_t)(void *queue);
 /**< @internal Release memory resources allocated by given RX/TX queue. */
 
+typedef uint32_t (*eth_rx_queue_count_t)(struct rte_eth_dev *dev, 
+						uint16_t rx_queue_id);
+/**< Get number of available descriptors on a receive queue of an Ethernet device. */
+
 typedef int (*vlan_filter_set_t)(struct rte_eth_dev *dev,
 				  uint16_t vlan_id,
 				  int on);
@@ -875,6 +879,7 @@ struct eth_dev_ops {
 	vlan_offload_set_t         vlan_offload_set; /**< Set VLAN Offload. */
 	eth_rx_queue_setup_t       rx_queue_setup;/**< Set up device RX queue.*/
 	eth_queue_release_t        rx_queue_release;/**< Release RX queue.*/
+	eth_rx_queue_count_t       rx_queue_count; /**< Get Rx queue count. */
 	eth_tx_queue_setup_t       tx_queue_setup;/**< Set up device TX queue.*/
 	eth_queue_release_t        tx_queue_release;/**< Release TX queue.*/
 	eth_dev_led_on_t           dev_led_on;    /**< Turn on LED. */
@@ -1672,6 +1677,19 @@ rte_eth_rx_burst(uint8_t port_id, uint16_t queue_id,
 }
 #endif
 
+#ifdef RTE_LIBRTE_ETHDEV_DEBUG
+extern uint32_t rte_eth_rx_queue_count(uint8_t port_id, uint16_t queue_id);
+#else
+static inline uint32_t
+rte_eth_rx_queue_count(uint8_t port_id, uint16_t queue_id)
+{
+        struct rte_eth_dev *dev;
+ 
+        dev = &rte_eth_devices[port_id];
+        return (*dev->dev_ops->rx_queue_count)(dev, queue_id);
+}
+#endif
+
 /**
  * Send a burst of output packets on a transmit queue of an Ethernet device.
  *
-- 
2.20.1