net/ixgbe: support NIC reset

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>

diff --git a/drivers/net/ixgbe/ixgbe_ethdev.c b/drivers/net/ixgbe/ixgbe_ethdev.c
index 22171d8..9ca5cbc 100644 (file)
--- a/drivers/net/ixgbe/ixgbe_ethdev.c
+++ b/drivers/net/ixgbe/ixgbe_ethdev.c
@@ -169,6 +169,7 @@ 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);
@@ -265,6 +266,7 @@ 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,
@@ -518,6 +520,7 @@ 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,
@@ -608,6 +611,7 @@ 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,
@@ -2842,7 +2846,7 @@ ixgbe_dev_set_link_down(struct rte_eth_dev *dev)
 }
 
 /*
- * Reest and stop device.
+ * Reset and stop device.
  */
 static void
 ixgbe_dev_close(struct rte_eth_dev *dev)
@@ -2865,6 +2869,32 @@ ixgbe_dev_close(struct rte_eth_dev *dev)
        ixgbe_set_rar(hw, 0, hw->mac.addr, 0, IXGBE_RAH_AV);
 }
 
+/*
+ * Reset 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,
@@ -5078,6 +5108,23 @@ 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);