[PATCH v9 3/5] net/i40e: add support of reset

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

Reset a NIC by calling dev_uninit() and then dev_init().
Go through the 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/i40e/i40e_ethdev.c    | 28 ++++++++++++++++++++++++++++
 drivers/net/i40e/i40e_ethdev_vf.c | 19 +++++++++++++++++++
 2 files changed, 47 insertions(+)

diff --git a/drivers/net/i40e/i40e_ethdev.c b/drivers/net/i40e/i40e_ethdev.c
index 9fcccda..1641e00 100644
--- a/drivers/net/i40e/i40e_ethdev.c
+++ b/drivers/net/i40e/i40e_ethdev.c
@@ -250,6 +250,7 @@ static int i40e_dev_configure(struct rte_eth_dev *dev);
 static int i40e_dev_start(struct rte_eth_dev *dev);
 static void i40e_dev_stop(struct rte_eth_dev *dev);
 static void i40e_dev_close(struct rte_eth_dev *dev);
+static int  i40e_dev_reset(struct rte_eth_dev *dev);
 static void i40e_dev_promiscuous_enable(struct rte_eth_dev *dev);
 static void i40e_dev_promiscuous_disable(struct rte_eth_dev *dev);
 static void i40e_dev_allmulticast_enable(struct rte_eth_dev *dev);
@@ -449,6 +450,7 @@ static const struct eth_dev_ops i40e_eth_dev_ops = {
 	.dev_start                    = i40e_dev_start,
 	.dev_stop                     = i40e_dev_stop,
 	.dev_close                    = i40e_dev_close,
+	.dev_reset		      = i40e_dev_reset,
 	.promiscuous_enable           = i40e_dev_promiscuous_enable,
 	.promiscuous_disable          = i40e_dev_promiscuous_disable,
 	.allmulticast_enable          = i40e_dev_allmulticast_enable,
@@ -2155,6 +2157,32 @@ i40e_dev_close(struct rte_eth_dev *dev)
 	I40E_WRITE_FLUSH(hw);
 }
 
+/*
+ * Reest PF device only to re-initialize resources in PMD layer
+ */
+static int
+i40e_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 i40e 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_i40e_dev_uninit(dev);
+	if (ret)
+		return ret;
+
+	ret = eth_i40e_dev_init(dev);
+
+	return ret;
+}
+
 static void
 i40e_dev_promiscuous_enable(struct rte_eth_dev *dev)
 {
diff --git a/drivers/net/i40e/i40e_ethdev_vf.c b/drivers/net/i40e/i40e_ethdev_vf.c
index f6d8293..f951d4e 100644
--- a/drivers/net/i40e/i40e_ethdev_vf.c
+++ b/drivers/net/i40e/i40e_ethdev_vf.c
@@ -122,6 +122,7 @@ static void i40evf_vlan_offload_set(struct rte_eth_dev *dev, int mask);
 static int i40evf_vlan_pvid_set(struct rte_eth_dev *dev, uint16_t pvid,
 				int on);
 static void i40evf_dev_close(struct rte_eth_dev *dev);
+static int  i40evf_dev_reset(struct rte_eth_dev *dev);
 static void i40evf_dev_promiscuous_enable(struct rte_eth_dev *dev);
 static void i40evf_dev_promiscuous_disable(struct rte_eth_dev *dev);
 static void i40evf_dev_allmulticast_enable(struct rte_eth_dev *dev);
@@ -203,6 +204,7 @@ static const struct eth_dev_ops i40evf_eth_dev_ops = {
 	.xstats_get_names     = i40evf_dev_xstats_get_names,
 	.xstats_reset         = i40evf_dev_xstats_reset,
 	.dev_close            = i40evf_dev_close,
+	.dev_reset	      = i40evf_dev_reset,
 	.dev_infos_get        = i40evf_dev_info_get,
 	.dev_supported_ptypes_get = i40e_dev_supported_ptypes_get,
 	.vlan_filter_set      = i40evf_vlan_filter_set,
@@ -2373,6 +2375,23 @@ i40evf_dev_close(struct rte_eth_dev *dev)
 	i40evf_disable_irq0(hw);
 }
 
+/*
+ * Reest VF device only to re-initialize resources in PMD layer
+ */
+static int
+i40evf_dev_reset(struct rte_eth_dev *dev)
+{
+	int ret;
+
+	ret = i40evf_dev_uninit(dev);
+	if (ret)
+		return ret;
+
+	ret = i40evf_dev_init(dev);
+
+	return ret;
+}
+
 static int
 i40evf_get_rss_lut(struct i40e_vsi *vsi, uint8_t *lut, uint16_t lut_size)
 {
-- 
2.7.5