[dpdk-dev] [PATCHv3 1/5] ethdev: add new API to retrieve RX/TX queue information

[Konstantin Ananyev <konstantin.ananyev@intel.com>]

Add the ability for the upper layer to query RX/TX queue information.

Add new structures:
struct rte_eth_rxq_info
struct rte_eth_txq_info

new functions:
rte_eth_rx_queue_info_get
rte_eth_tx_queue_info_get

into rte_etdev API.

Left extra free space in the queue info structures,
so extra fields could be added later without ABI breakage.

v2 changes:
- Add formal check for the qinfo input parameter.
- As suggested rename 'rx_qinfo/tx_qinfo' to 'rxq_info/txq_info'

v3 changes:
- Updated rte_ether_version.map 
- Merged with latest changes

Signed-off-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
---
 lib/librte_ether/rte_ethdev.c          | 54 +++++++++++++++++++++
 lib/librte_ether/rte_ethdev.h          | 87 +++++++++++++++++++++++++++++++---
 lib/librte_ether/rte_ether_version.map |  2 +
 3 files changed, 137 insertions(+), 6 deletions(-)

diff --git a/lib/librte_ether/rte_ethdev.c b/lib/librte_ether/rte_ethdev.c
index 94104ce..a94c119 100644
--- a/lib/librte_ether/rte_ethdev.c
+++ b/lib/librte_ether/rte_ethdev.c
@@ -3341,6 +3341,60 @@ rte_eth_remove_tx_callback(uint8_t port_id, uint16_t queue_id,
 }
 
 int
+rte_eth_rx_queue_info_get(uint8_t port_id, uint16_t queue_id,
+	struct rte_eth_rxq_info *qinfo)
+{
+	struct rte_eth_dev *dev;
+
+	if (qinfo == NULL)
+		return -EINVAL;
+
+	if (!rte_eth_dev_is_valid_port(port_id)) {
+		PMD_DEBUG_TRACE("Invalid port_id=%d\n", port_id);
+		return -EINVAL;
+	}
+
+	dev = &rte_eth_devices[port_id];
+	if (queue_id >= dev->data->nb_rx_queues) {
+		PMD_DEBUG_TRACE("Invalid RX queue_id=%d\n", queue_id);
+		return -EINVAL;
+	}
+
+	FUNC_PTR_OR_ERR_RET(*dev->dev_ops->rxq_info_get, -ENOTSUP);
+
+	memset(qinfo, 0, sizeof(*qinfo));
+	dev->dev_ops->rxq_info_get(dev, queue_id, qinfo);
+	return 0;
+}
+
+int
+rte_eth_tx_queue_info_get(uint8_t port_id, uint16_t queue_id,
+	struct rte_eth_txq_info *qinfo)
+{
+	struct rte_eth_dev *dev;
+
+	if (qinfo == NULL)
+		return -EINVAL;
+
+	if (!rte_eth_dev_is_valid_port(port_id)) {
+		PMD_DEBUG_TRACE("Invalid port_id=%d\n", port_id);
+		return -EINVAL;
+	}
+
+	dev = &rte_eth_devices[port_id];
+	if (queue_id >= dev->data->nb_tx_queues) {
+		PMD_DEBUG_TRACE("Invalid TX queue_id=%d\n", queue_id);
+		return -EINVAL;
+	}
+
+	FUNC_PTR_OR_ERR_RET(*dev->dev_ops->txq_info_get, -ENOTSUP);
+
+	memset(qinfo, 0, sizeof(*qinfo));
+	dev->dev_ops->txq_info_get(dev, queue_id, qinfo);
+	return 0;
+}
+
+int
 rte_eth_dev_set_mc_addr_list(uint8_t port_id,
 			     struct ether_addr *mc_addr_set,
 			     uint32_t nb_mc_addr)
diff --git a/lib/librte_ether/rte_ethdev.h b/lib/librte_ether/rte_ethdev.h
index c901a2c..0c6705e 100644
--- a/lib/librte_ether/rte_ethdev.h
+++ b/lib/librte_ether/rte_ethdev.h
@@ -960,6 +960,30 @@ struct rte_eth_xstats {
 	uint64_t value;
 };
 
+/**
+ * Ethernet device RX queue information strcuture.
+ * Used to retieve information about configured queue.
+ */
+struct rte_eth_rxq_info {
+	struct rte_mempool *mp;     /**< mempool used by that queue. */
+	struct rte_eth_rxconf conf; /**< queue config parameters. */
+	uint8_t scattered_rx;       /**< scattered packets RX supported. */
+	uint16_t nb_desc;           /**< configured number of RXDs. */
+	uint16_t max_desc;          /**< max allowed number of RXDs. */
+	uint16_t min_desc;          /**< min allowed number of RXDs. */
+} __rte_cache_aligned;
+
+/**
+ * Ethernet device TX queue information strcuture.
+ * Used to retieve information about configured queue.
+ */
+struct rte_eth_txq_info {
+	struct rte_eth_txconf conf; /**< queue config parameters. */
+	uint16_t nb_desc;           /**< configured number of TXDs. */
+	uint16_t max_desc;          /**< max allowed number of TXDs. */
+	uint16_t min_desc;          /**< min allowed number of TXDs. */
+} __rte_cache_aligned;
+
 struct rte_eth_dev;
 
 struct rte_eth_dev_callback;
@@ -1063,6 +1087,12 @@ typedef uint32_t (*eth_rx_queue_count_t)(struct rte_eth_dev *dev,
 typedef int (*eth_rx_descriptor_done_t)(void *rxq, uint16_t offset);
 /**< @internal Check DD bit of specific RX descriptor */
 
+typedef void (*eth_rxq_info_get_t)(struct rte_eth_dev *dev,
+	uint16_t rx_queue_id, struct rte_eth_rxq_info *qinfo);
+
+typedef void (*eth_txq_info_get_t)(struct rte_eth_dev *dev,
+	uint16_t tx_queue_id, struct rte_eth_txq_info *qinfo);
+
 typedef int (*mtu_set_t)(struct rte_eth_dev *dev, uint16_t mtu);
 /**< @internal Set MTU. */
 
@@ -1451,9 +1481,13 @@ struct eth_dev_ops {
 	rss_hash_update_t rss_hash_update;
 	/** Get current RSS hash configuration. */
 	rss_hash_conf_get_t rss_hash_conf_get;
-	eth_filter_ctrl_t              filter_ctrl;          /**< common filter control*/
+	eth_filter_ctrl_t              filter_ctrl;
+	/**< common filter control. */
 	eth_set_mc_addr_list_t set_mc_addr_list; /**< set list of mcast addrs */
-
+	eth_rxq_info_get_t rxq_info_get;
+	/**< retrieve RX queue information. */
+	eth_txq_info_get_t txq_info_get;
+	/**< retrieve TX queue information. */
 	/** Turn IEEE1588/802.1AS timestamping on. */
 	eth_timesync_enable_t timesync_enable;
 	/** Turn IEEE1588/802.1AS timestamping off. */
@@ -3721,6 +3755,46 @@ int rte_eth_remove_tx_callback(uint8_t port_id, uint16_t queue_id,
 		struct rte_eth_rxtx_callback *user_cb);
 
 /**
+ * Retrieve information about given port's RX queue.
+ *
+ * @param port_id
+ *   The port identifier of the Ethernet device.
+ * @param queue_id
+ *   The RX queue on the Ethernet device for which information
+ *   will be retrieved.
+ * @param qinfo
+ *   A pointer to a structure of type *rte_eth_rxq_info_info* to be filled with
+ *   the information of the Ethernet device.
+ *
+ * @return
+ *   - 0: Success
+ *   - -ENOTSUP: routine is not supported by the device PMD.
+ *   - -EINVAL:  The port_id or the queue_id is out of range.
+ */
+int rte_eth_rx_queue_info_get(uint8_t port_id, uint16_t queue_id,
+	struct rte_eth_rxq_info *qinfo);
+
+/**
+ * Retrieve information about given port's TX queue.
+ *
+ * @param port_id
+ *   The port identifier of the Ethernet device.
+ * @param queue_id
+ *   The TX queue on the Ethernet device for which information
+ *   will be retrieved.
+ * @param qinfo
+ *   A pointer to a structure of type *rte_eth_txq_info_info* to be filled with
+ *   the information of the Ethernet device.
+ *
+ * @return
+ *   - 0: Success
+ *   - -ENOTSUP: routine is not supported by the device PMD.
+ *   - -EINVAL:  The port_id or the queue_id is out of range.
+ */
+int rte_eth_tx_queue_info_get(uint8_t port_id, uint16_t queue_id,
+	struct rte_eth_txq_info *qinfo);
+
+/*
  * Retrieve number of available registers for access
  *
  * @param port_id
@@ -3793,10 +3867,6 @@ int rte_eth_dev_get_eeprom(uint8_t port_id, struct rte_dev_eeprom_info *info);
  */
 int rte_eth_dev_set_eeprom(uint8_t port_id, struct rte_dev_eeprom_info *info);
 
-#ifdef __cplusplus
-}
-#endif
-
 /**
  * Set the list of multicast addresses to filter on an Ethernet device.
  *
@@ -3882,4 +3952,9 @@ extern int rte_eth_timesync_read_rx_timestamp(uint8_t port_id,
  */
 extern int rte_eth_timesync_read_tx_timestamp(uint8_t port_id,
 					      struct timespec *timestamp);
+
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* _RTE_ETHDEV_H_ */
diff --git a/lib/librte_ether/rte_ether_version.map b/lib/librte_ether/rte_ether_version.map
index 23cfee9..8de0928 100644
--- a/lib/librte_ether/rte_ether_version.map
+++ b/lib/librte_ether/rte_ether_version.map
@@ -92,6 +92,7 @@ DPDK_2.0 {
 	rte_eth_rx_burst;
 	rte_eth_rx_descriptor_done;
 	rte_eth_rx_queue_count;
+	rte_eth_rx_queue_info_get;
 	rte_eth_rx_queue_setup;
 	rte_eth_set_queue_rate_limit;
 	rte_eth_set_vf_rate_limit;
@@ -99,6 +100,7 @@ DPDK_2.0 {
 	rte_eth_stats_get;
 	rte_eth_stats_reset;
 	rte_eth_tx_burst;
+	rte_eth_tx_queue_info_get;
 	rte_eth_tx_queue_setup;
 	rte_eth_xstats_get;
 	rte_eth_xstats_reset;
-- 
1.8.3.1