net/i40e: support NIC reset

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>

diff --git a/drivers/net/i40e/i40e_ethdev.c b/drivers/net/i40e/i40e_ethdev.c
index 5f26e24..f12aefa 100644 (file)
--- 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,
@@ -2165,6 +2167,32 @@ i40e_dev_close(struct rte_eth_dev *dev)
        I40E_WRITE_FLUSH(hw);
 }
 
+/*
+ * Reset 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..73c315a 100644 (file)
--- 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);
 }
 
+/*
+ * Reset 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)
 {