[PATCH v6 2/4] net/ixgbe: add support of reset

[Wei Dai <wei.dai@intel.com>]

Reset a NIC by calling dev_uninit and then dev_init.
Go through same way in NIC PCI remove without release of
ethdev resource and then NIC PCI probe function without
ethdev resource allocation.

Signed-off-by: Wei Dai <wei.dai@intel.com>
---
 drivers/net/ixgbe/ixgbe_ethdev.c | 47 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)

diff --git a/drivers/net/ixgbe/ixgbe_ethdev.c b/drivers/net/ixgbe/ixgbe_ethdev.c
index a0ae089..280f4bb 100644
--- a/drivers/net/ixgbe/ixgbe_ethdev.c
+++ b/drivers/net/ixgbe/ixgbe_ethdev.c
@@ -170,6 +170,7 @@ static void ixgbe_dev_stop(struct rte_eth_dev *dev);
 static int  ixgbe_dev_set_link_up(struct rte_eth_dev *dev);
 static int  ixgbe_dev_set_link_down(struct rte_eth_dev *dev);
 static void ixgbe_dev_close(struct rte_eth_dev *dev);
+static int  ixgbe_dev_reset(struct rte_eth_dev *dev);
 static void ixgbe_dev_promiscuous_enable(struct rte_eth_dev *dev);
 static void ixgbe_dev_promiscuous_disable(struct rte_eth_dev *dev);
 static void ixgbe_dev_allmulticast_enable(struct rte_eth_dev *dev);
@@ -266,6 +267,7 @@ static int ixgbevf_dev_link_update(struct rte_eth_dev *dev,
 				   int wait_to_complete);
 static void ixgbevf_dev_stop(struct rte_eth_dev *dev);
 static void ixgbevf_dev_close(struct rte_eth_dev *dev);
+static int  ixgbevf_dev_reset(struct rte_eth_dev *dev);
 static void ixgbevf_intr_disable(struct ixgbe_hw *hw);
 static void ixgbevf_intr_enable(struct ixgbe_hw *hw);
 static void ixgbevf_dev_stats_get(struct rte_eth_dev *dev,
@@ -527,6 +529,7 @@ static const struct eth_dev_ops ixgbe_eth_dev_ops = {
 	.dev_set_link_up    = ixgbe_dev_set_link_up,
 	.dev_set_link_down  = ixgbe_dev_set_link_down,
 	.dev_close            = ixgbe_dev_close,
+	.dev_reset	      = ixgbe_dev_reset,
 	.promiscuous_enable   = ixgbe_dev_promiscuous_enable,
 	.promiscuous_disable  = ixgbe_dev_promiscuous_disable,
 	.allmulticast_enable  = ixgbe_dev_allmulticast_enable,
@@ -616,6 +619,7 @@ static const struct eth_dev_ops ixgbevf_eth_dev_ops = {
 	.xstats_reset         = ixgbevf_dev_stats_reset,
 	.xstats_get_names     = ixgbevf_dev_xstats_get_names,
 	.dev_close            = ixgbevf_dev_close,
+	.dev_reset	      = ixgbevf_dev_reset,
 	.allmulticast_enable  = ixgbevf_dev_allmulticast_enable,
 	.allmulticast_disable = ixgbevf_dev_allmulticast_disable,
 	.dev_infos_get        = ixgbevf_dev_info_get,
@@ -2840,6 +2844,32 @@ ixgbe_dev_close(struct rte_eth_dev *dev)
 	ixgbe_set_rar(hw, 0, hw->mac.addr, 0, IXGBE_RAH_AV);
 }
 
+/*
+ * Reest PF device.
+ */
+static int
+ixgbe_dev_reset(struct rte_eth_dev *dev)
+{
+	int ret;
+
+	/* When a DPDK PMD PF begin to reset PF port, it should notify all
+	 * its VF to make them align with it. The detailed notification
+	 * mechanism is PMD specific. As to ixgbe PF, it is rather complex.
+	 * To avoid unexpected behavior in VF, currently reset of PF with
+	 * SR-IOV activation is not supported. It might be supported later.
+	 */
+	if (dev->data->sriov.active)
+		return -ENOTSUP;
+
+	ret = eth_ixgbe_dev_uninit(dev);
+	if (ret)
+		return ret;
+
+	ret = eth_ixgbe_dev_init(dev);
+
+	return ret;
+}
+
 static void
 ixgbe_read_stats_registers(struct ixgbe_hw *hw,
 			   struct ixgbe_hw_stats *hw_stats,
@@ -5036,6 +5066,23 @@ ixgbevf_dev_close(struct rte_eth_dev *dev)
 	ixgbevf_remove_mac_addr(dev, 0);
 }
 
+/*
+ * Reset VF device
+ */
+static int
+ixgbevf_dev_reset(struct rte_eth_dev *dev)
+{
+	int ret;
+
+	ret = eth_ixgbevf_dev_uninit(dev);
+	if (ret)
+		return ret;
+
+	ret = eth_ixgbevf_dev_init(dev);
+
+	return ret;
+}
+
 static void ixgbevf_set_vfta_all(struct rte_eth_dev *dev, bool on)
 {
 	struct ixgbe_hw *hw = IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private);
-- 
2.7.5