[PATCH v5 1/2] ethdev: add traffic management ops get API

[Cristian Dumitrescu <cristian.dumitrescu@intel.com>]

The rte_flow feature breaks the monolithic approach for ethdev by
introducing the new rte_flow API to ethdev using a plugin-like approach.

Basically, the rte_flow API is still logically part of ethdev:
- It extends the ethdev functionality: rte_flow is a new feature/
  capability of ethdev;
- all its functions work on an Ethernet device: the first parameter of the
  rte_flow functions is Ethernet device port ID.

Also, the rte_flow API is a sort of capability plugin for ethdev:
- the rte_flow API functions have their own name space: they are called
  rte_flow_operationXYZ() as opposed to rte_eth_dev_flow_operationXYZ());
- the rte_flow API functions are placed in separate files in the same
  librte_ether folder as opposed to rte_ethdev.[hc].

The way it works is by using the existing ethdev API function
rte_eth_dev_filter_ctrl() to query the current Ethernet device port ID for
the support of the rte_flow capability and return the pointer to the
rte_flow operations when supported and NULL otherwise:

struct rte_flow_ops *eth_flow_ops;
int rte = rte_eth_dev_filter_ctrl(eth_port_id,
	RTE_ETH_FILTER_GENERIC, RTE_ETH_FILTER_GET, &eth_flow_ops);

This patch reuses the same approach for ethdev Traffic Management API.

Signed-off-by: Cristian Dumitrescu <cristian.dumitrescu@intel.com>
Acked-by: Keith Wiles <keith.wiles@intel.com>
Acked-by: Jerin Jacob <jerin.jacob@caviumnetworks.com>
Acked-by: Hemant Agrawal <hemant.agrawal@nxp.com>
---
Changes in v4:
- Followed up on suggestion from Thomas: Replaced generic capability
  ethdev API function with traffic management specific function
  rte_eth_dev_tm_ops_get()

Changes in v3:
- Followed up on suggestion from Jerin: renamed capability from
  Hierarchical Scheduler (sched) to Traffic Manager (tm)

Changes in v2:
- Followed up on suggestion from Jerin and Hemant: renamed
  capability_control() to capability_ops_get()
- Added ACK from Keith, Jerin and Hemant

 lib/librte_ether/rte_ethdev.c          | 12 ++++++++++++
 lib/librte_ether/rte_ethdev.h          | 20 ++++++++++++++++++++
 lib/librte_ether/rte_ether_version.map |  6 ++++++
 3 files changed, 38 insertions(+)

diff --git a/lib/librte_ether/rte_ethdev.c b/lib/librte_ether/rte_ethdev.c
index 83898a8..f735f1e 100644
--- a/lib/librte_ether/rte_ethdev.c
+++ b/lib/librte_ether/rte_ethdev.c
@@ -3021,6 +3021,18 @@ rte_eth_dev_filter_ctrl(uint8_t port_id, enum rte_filter_type filter_type,
 	return (*dev->dev_ops->filter_ctrl)(dev, filter_type, filter_op, arg);
 }
 
+int
+rte_eth_dev_tm_ops_get(uint8_t port_id, void *ops)
+{
+	struct rte_eth_dev *dev;
+
+	RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -ENODEV);
+
+	dev = &rte_eth_devices[port_id];
+	RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->tm_ops_get, -ENOTSUP);
+	return (*dev->dev_ops->tm_ops_get)(dev, ops);
+}
+
 void *
 rte_eth_add_rx_callback(uint8_t port_id, uint16_t queue_id,
 		rte_rx_callback_fn fn, void *user_param)
diff --git a/lib/librte_ether/rte_ethdev.h b/lib/librte_ether/rte_ethdev.h
index 121058c..26b53f4 100644
--- a/lib/librte_ether/rte_ethdev.h
+++ b/lib/librte_ether/rte_ethdev.h
@@ -1441,6 +1441,9 @@ typedef int (*eth_filter_ctrl_t)(struct rte_eth_dev *dev,
 				 void *arg);
 /**< @internal Take operations to assigned filter type on an Ethernet device */
 
+typedef int (*eth_tm_ops_get_t)(struct rte_eth_dev *dev, void *ops);
+/**< @internal Get Traffic Management (TM) operations on an Ethernet device */
+
 typedef int (*eth_get_dcb_info)(struct rte_eth_dev *dev,
 				 struct rte_eth_dcb_info *dcb_info);
 /**< @internal Get dcb information on an Ethernet device */
@@ -1573,6 +1576,9 @@ struct eth_dev_ops {
 	/**< Get extended device statistic values by ID. */
 	eth_xstats_get_names_by_id_t xstats_get_names_by_id;
 	/**< Get name of extended device statistics by ID. */
+
+	eth_tm_ops_get_t tm_ops_get;
+	/**< Get Traffic Management (TM) operations. */
 };
 
 /**
@@ -4105,6 +4111,20 @@ int rte_eth_dev_filter_ctrl(uint8_t port_id, enum rte_filter_type filter_type,
 			enum rte_filter_op filter_op, void *arg);
 
 /**
+ * Take Traffic Management (TM) operations on an Ethernet device.
+ *
+ * @param port_id
+ *   The port identifier of the Ethernet device.
+ * @param ops
+ *   Pointer to TM operations.
+ * @return
+ *   - (0) if successful.
+ *   - (-ENOTSUP) if hardware doesn't support.
+ *   - (-ENODEV) if *port_id* invalid.
+ */
+int rte_eth_dev_tm_ops_get(uint8_t port_id, void *ops);
+
+/**
  * Get DCB information on an Ethernet device.
  *
  * @param port_id
diff --git a/lib/librte_ether/rte_ether_version.map b/lib/librte_ether/rte_ether_version.map
index d6726bb..2788e7b 100644
--- a/lib/librte_ether/rte_ether_version.map
+++ b/lib/librte_ether/rte_ether_version.map
@@ -156,3 +156,9 @@ DPDK_17.05 {
 	rte_eth_xstats_get_names_by_id;
 
 } DPDK_17.02;
+
+DPDK_17.08 {
+    global:
+
+	rte_eth_dev_tm_ops_get;
+} DPDK_17.05;
-- 
2.7.4