From 6a6f2b57a3bc484771a7aea8f1695e3e172cd688 Mon Sep 17 00:00:00 2001
From: Intel <intel.com>
Date: Tue, 23 Jul 2013 00:00:00 +0200
Subject: [PATCH] ethdev: check DD bit of specific RX descriptor

Signed-off-by: Intel
---
 lib/librte_ether/rte_ethdev.c | 15 +++++++++++++++
 lib/librte_ether/rte_ethdev.h | 34 ++++++++++++++++++++++++++++++++++
 2 files changed, 49 insertions(+)

diff --git a/lib/librte_ether/rte_ethdev.c b/lib/librte_ether/rte_ethdev.c
index afc9b7284d..2e85ab7a0f 100644
--- a/lib/librte_ether/rte_ethdev.c
+++ b/lib/librte_ether/rte_ethdev.c
@@ -1739,6 +1739,21 @@ rte_eth_rx_queue_count(uint8_t port_id, uint16_t queue_id)
 	FUNC_PTR_OR_ERR_RET(*dev->dev_ops->rx_queue_count, -ENOTSUP);
 	return (*dev->dev_ops->rx_queue_count)(dev, queue_id);	
 }
+
+int
+rte_eth_rx_descriptor_done(uint8_t port_id, uint16_t queue_id, uint16_t offset)
+{
+	struct rte_eth_dev *dev;
+
+	if (port_id >= nb_ports) {
+		PMD_DEBUG_TRACE("Invalid port_id=%d\n", port_id);
+		return (-ENODEV);
+	}
+	dev = &rte_eth_devices[port_id];
+	FUNC_PTR_OR_ERR_RET(*dev->dev_ops->rx_descriptor_done, -ENOTSUP);
+	return (*dev->dev_ops->rx_descriptor_done)( \
+		dev->data->rx_queues[queue_id], offset);
+}
 #endif
 
 int
diff --git a/lib/librte_ether/rte_ethdev.h b/lib/librte_ether/rte_ethdev.h
index 3509aeabc8..253a47c24b 100644
--- a/lib/librte_ether/rte_ethdev.h
+++ b/lib/librte_ether/rte_ethdev.h
@@ -782,6 +782,9 @@ 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 (*eth_rx_descriptor_done_t)(void *rxq, uint16_t offset);
+/**< @Check DD bit of specific RX descriptor */
+
 typedef int (*vlan_filter_set_t)(struct rte_eth_dev *dev,
 				  uint16_t vlan_id,
 				  int on);
@@ -904,6 +907,7 @@ struct eth_dev_ops {
 	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_rx_descriptor_done_t   rx_descriptor_done;  /**< Check rxd DD bit */
 	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. */
@@ -1734,6 +1738,36 @@ rte_eth_rx_queue_count(uint8_t port_id, uint16_t queue_id)
 }
 #endif
 
+/**
+ * Check if the DD bit of the specific RX descriptor in the queue has been set
+ *
+ * @param port_id
+ *  The port identifier of the Ethernet device.
+ * @param queue_id
+ *  The queue id on the specific port.
+ * @offset
+ *  The offset of the descriptor ID from tail.
+ * @return
+ *  - (1) if the specific DD bit is set.
+ *  - (0) if the specific DD bit is not set.
+ *  - (-ENODEV) if *port_id* invalid.
+ */
+#ifdef RTE_LIBRTE_ETHDEV_DEBUG
+extern int rte_eth_rx_descriptor_done(uint8_t port_id,
+				      uint16_t queue_id,
+				      uint16_t offset);
+#else
+static inline int
+rte_eth_rx_descriptor_done(uint8_t port_id, uint16_t queue_id, uint16_t offset)
+{
+	struct rte_eth_dev *dev;
+
+	dev = &rte_eth_devices[port_id];
+	return (*dev->dev_ops->rx_descriptor_done)( \
+		dev->data->rx_queues[queue_id], offset);
+}
+#endif
+
 /**
  * Send a burst of output packets on a transmit queue of an Ethernet device.
  *
-- 
2.20.1