From 92e16314207228595adecd7bb5bc9a2083806426 Mon Sep 17 00:00:00 2001
From: Intel <intel.com>
Date: Thu, 20 Dec 2012 00:00:00 +0100
Subject: [PATCH] ethdev: add priority flow control configuration

Signed-off-by: Intel
---
 lib/librte_ether/rte_ethdev.c | 27 ++++++++++++++++++++++-----
 lib/librte_ether/rte_ethdev.h | 33 +++++++++++++++++++++++++++++++++
 2 files changed, 55 insertions(+), 5 deletions(-)

diff --git a/lib/librte_ether/rte_ethdev.c b/lib/librte_ether/rte_ethdev.c
index 7aadbd3159..db013e586a 100644
--- a/lib/librte_ether/rte_ethdev.c
+++ b/lib/librte_ether/rte_ethdev.c
@@ -1381,13 +1381,30 @@ rte_eth_dev_flow_ctrl_set(uint8_t port_id, struct rte_eth_fc_conf *fc_conf)
 	}
 
 	dev = &rte_eth_devices[port_id];
-
-	/* High water, low water validation are device specific */
 	FUNC_PTR_OR_ERR_RET(*dev->dev_ops->flow_ctrl_set, -ENOTSUP);
-	if  (*dev->dev_ops->flow_ctrl_set)
-		return (*dev->dev_ops->flow_ctrl_set)(dev, fc_conf);
+	return (*dev->dev_ops->flow_ctrl_set)(dev, fc_conf);
+}
 
-	return -ENOTSUP;
+int
+rte_eth_dev_priority_flow_ctrl_set(uint8_t port_id, struct rte_eth_pfc_conf *pfc_conf)
+{
+	struct rte_eth_dev *dev;
+
+	if (port_id >= nb_ports) {
+		PMD_DEBUG_TRACE("Invalid port_id=%d\n", port_id);
+		return (-ENODEV);
+	}
+
+	if (pfc_conf->priority > (ETH_DCB_NUM_USER_PRIORITIES - 1)) {
+		PMD_DEBUG_TRACE("Invalid priority, only 0-7 allowed\n");
+		return (-EINVAL);
+	}
+
+	dev = &rte_eth_devices[port_id];
+	/* High water, low water validation are device specific */
+	if  (*dev->dev_ops->priority_flow_ctrl_set)
+		return (*dev->dev_ops->priority_flow_ctrl_set)(dev, pfc_conf);
+	return (-ENOTSUP);
 }
 
 int
diff --git a/lib/librte_ether/rte_ethdev.h b/lib/librte_ether/rte_ethdev.h
index 1cfb76a61a..4e57af8f9e 100644
--- a/lib/librte_ether/rte_ethdev.h
+++ b/lib/librte_ether/rte_ethdev.h
@@ -439,6 +439,16 @@ struct rte_eth_fc_conf {
 	enum rte_eth_fc_mode mode;  /**< Link flow control mode */
 };
 
+/**
+ * A structure used to configure Ethernet priority flow control parameter.
+ * These parameters will be configured into the register of the NIC.
+ * Please refer to the corresponding data sheet for proper value.
+ */
+struct rte_eth_pfc_conf {
+	struct rte_eth_fc_conf fc; /**< General flow control parameter. */
+	uint8_t priority;          /**< VLAN User Priority. */
+};
+
 /**
  *  Flow Director setting modes: none (default), signature or perfect.
  */
@@ -791,6 +801,10 @@ typedef int (*flow_ctrl_set_t)(struct rte_eth_dev *dev,
 				struct rte_eth_fc_conf *fc_conf);
 /**< @internal Setup flow control parameter on an Ethernet device */
 
+typedef int (*priority_flow_ctrl_set_t)(struct rte_eth_dev *dev,
+				struct rte_eth_pfc_conf *pfc_conf);
+/**< @internal Setup priority flow control parameter on an Ethernet device */
+
 typedef int (*eth_dev_led_on_t)(struct rte_eth_dev *dev);
 /**< @internal Turn on SW controllable LED on an Ethernet device */
 
@@ -835,6 +849,7 @@ struct eth_dev_ops {
 	eth_dev_led_on_t           dev_led_on;    /**< Turn on LED. */
 	eth_dev_led_off_t          dev_led_off;   /**< Turn off LED. */
 	flow_ctrl_set_t            flow_ctrl_set; /**< Setup flow control. */
+	priority_flow_ctrl_set_t   priority_flow_ctrl_set; /**< Setup priority flow control.*/
 	eth_mac_addr_remove_t      mac_addr_remove; /**< Remove MAC address */
 	eth_mac_addr_add_t         mac_addr_add;  /**< Add a MAC address */
 
@@ -2016,6 +2031,24 @@ int  rte_eth_led_off(uint8_t port_id);
 int rte_eth_dev_flow_ctrl_set(uint8_t port_id,
 				struct rte_eth_fc_conf *fc_conf);
 
+/**
+ * Configure the Ethernet priority flow control under DCB environment 
+ * for Ethernet device. 
+ * 
+ * @param port_id
+ * The port identifier of the Ethernet device.
+ * @param pfc_conf
+ * The pointer to the structure of the priority flow control parameters.
+ * @return
+ *   - (0) if successful.
+ *   - (-ENOTSUP) if hardware doesn't support priority flow control mode.
+ *   - (-ENODEV)  if *port_id* invalid.
+ *   - (-EINVAL)  if bad parameter
+ *   - (-EIO)     if flow control setup failure
+ */
+int rte_eth_dev_priority_flow_ctrl_set(uint8_t port_id,
+				struct rte_eth_pfc_conf *pfc_conf);
+
 /**
  * Add a MAC address to an internal array of addresses used to enable whitelist
  * filtering to accept packets only if the destination MAC address matches.
-- 
2.20.1