[PATCH v6 3/4] igb: implement device reset on VF

[Wenzhuo Lu <wenzhuo.lu@intel.com>]

Implement the device reset function.

Signed-off-by: Wenzhuo Lu <wenzhuo.lu@intel.com>
---
 doc/guides/rel_notes/release_16_07.rst |  2 +-
 drivers/net/e1000/igb_ethdev.c         | 59 ++++++++++++++++++++++++++++++++++
 2 files changed, 60 insertions(+), 1 deletion(-)

diff --git a/doc/guides/rel_notes/release_16_07.rst b/doc/guides/rel_notes/release_16_07.rst
index d36c4b1..a4c0cc3 100644
--- a/doc/guides/rel_notes/release_16_07.rst
+++ b/doc/guides/rel_notes/release_16_07.rst
@@ -53,7 +53,7 @@ New Features
   VF. To handle this link up/down event, add the mailbox interruption
   support to receive the message.
 
-* **Added device reset support for ixgbe VF.**
+* **Added device reset support for ixgbe/igb VF.**
 
   Added the device reset API. APP can call this API to reset the VF port
   when it's not working.
diff --git a/drivers/net/e1000/igb_ethdev.c b/drivers/net/e1000/igb_ethdev.c
index b0e5e6a..f1ac4b5 100644
--- a/drivers/net/e1000/igb_ethdev.c
+++ b/drivers/net/e1000/igb_ethdev.c
@@ -268,6 +268,7 @@ static void eth_igb_configure_msix_intr(struct rte_eth_dev *dev);
 static void eth_igbvf_interrupt_handler(struct rte_intr_handle *handle,
 					void *param);
 static void igbvf_mbx_process(struct rte_eth_dev *dev);
+static int igbvf_dev_reset(struct rte_eth_dev *dev);
 
 /*
  * Define VF Stats MACRO for Non "cleared on read" register
@@ -409,6 +410,7 @@ static const struct eth_dev_ops igbvf_eth_dev_ops = {
 	.mac_addr_set         = igbvf_default_mac_addr_set,
 	.get_reg_length       = igbvf_get_reg_length,
 	.get_reg              = igbvf_get_regs,
+	.dev_reset            = igbvf_dev_reset,
 };
 
 /* store statistics names and its offset in stats structure */
@@ -2655,6 +2657,63 @@ void igbvf_mbx_process(struct rte_eth_dev *dev)
 }
 
 static int
+igbvf_dev_reset(struct rte_eth_dev *dev)
+{
+	struct e1000_hw *hw =
+		E1000_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+	int diag = 0;
+	uint32_t eiam;
+	/* Reference igbvf_intr_enable */
+	uint32_t eiam_mbx = 1 << E1000_VTIVAR_MISC_MAILBOX;
+
+	/* Nothing needs to be done if the device is not started. */
+	if (!dev->data->dev_started)
+		return 0;
+
+	PMD_DRV_LOG(DEBUG, "Link up/down event detected.");
+
+	/* Performance VF reset. */
+	do {
+		dev->data->dev_started = 0;
+		igbvf_dev_stop(dev);
+		if (dev->data->dev_conf.intr_conf.lsc == 0)
+			diag = eth_igb_link_update(dev, 0);
+		if (diag) {
+			PMD_INIT_LOG(INFO, "Igb VF reset: "
+				     "Failed to update link.");
+		}
+		rte_delay_ms(1000);
+
+		diag = igbvf_dev_start(dev);
+		if (diag) {
+			PMD_INIT_LOG(ERR, "Igb VF reset: "
+				     "Failed to start device.");
+			return diag;
+		}
+		dev->data->dev_started = 1;
+		eth_igbvf_stats_reset(dev);
+		if (dev->data->dev_conf.intr_conf.lsc == 0)
+			diag = eth_igb_link_update(dev, 0);
+		if (diag) {
+			PMD_INIT_LOG(INFO, "Igb VF reset: "
+				     "Failed to update link.");
+		}
+
+		/**
+		 * When the PF link is down, there has chance
+		 * that VF cannot operate its registers. Will
+		 * check if the registers is written
+		 * successfully. If not, repeat stop/start until
+		 * the PF link is up, in other words, until the
+		 * registers can be written.
+		 */
+		eiam = E1000_READ_REG(hw, E1000_EIAM);
+	} while (!(eiam & eiam_mbx));
+
+	return 0;
+}
+
+static int
 eth_igbvf_interrupt_action(struct rte_eth_dev *dev)
 {
 	struct e1000_interrupt *intr =
-- 
1.9.3