[PATCH] net/ixgbe: ensure link status is updated

[Laurent Hardy <laurent.hardy@6wind.com>]

In case of fiber and link speed set to 1Gb at peer side (with autoneg
or with defined speed), link status could be not properly updated at
time cable is plugged-in.
Indeed if cable was not plugged when device has been configured and
started then link status will not be updated properly with new speed
as no link setup will be triggered.

To avoid this issue, IXGBE_FLAG_NEED_LINK_CONFIG is set to try a link
setup each time link_update() is triggered and current link status is
down. When cable is plugged-in, link setup will be performed via
ixgbe_setup_link().

Signed-off-by: Laurent Hardy <laurent.hardy@6wind.com>
---

v1 -> v2:
- rebase on top of head (change flag to 1<<4)
- fix regression with copper links: only update link for fiber links

v2 -> v3:
- remove unnescessary check on speed mask if autoneg is false
---
 drivers/net/ixgbe/ixgbe_ethdev.c | 18 ++++++++++++++++++
 drivers/net/ixgbe/ixgbe_ethdev.h |  1 +
 2 files changed, 19 insertions(+)

diff --git a/drivers/net/ixgbe/ixgbe_ethdev.c b/drivers/net/ixgbe/ixgbe_ethdev.c
index 1462324..bd03e60 100644
--- a/drivers/net/ixgbe/ixgbe_ethdev.c
+++ b/drivers/net/ixgbe/ixgbe_ethdev.c
@@ -3516,8 +3516,12 @@ ixgbe_dev_link_update(struct rte_eth_dev *dev, int wait_to_complete)
 	struct ixgbe_hw *hw = IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private);
 	struct rte_eth_link link, old;
 	ixgbe_link_speed link_speed = IXGBE_LINK_SPEED_UNKNOWN;
+	struct ixgbe_interrupt *intr =
+		IXGBE_DEV_PRIVATE_TO_INTR(dev->data->dev_private);
 	int link_up;
 	int diag;
+	u32 speed = 0;
+	bool autoneg = false;
 
 	link.link_status = ETH_LINK_DOWN;
 	link.link_speed = 0;
@@ -3527,6 +3531,18 @@ ixgbe_dev_link_update(struct rte_eth_dev *dev, int wait_to_complete)
 
 	hw->mac.get_link_status = true;
 
+	if ((intr->flags & IXGBE_FLAG_NEED_LINK_CONFIG) &&
+		hw->mac.ops.get_media_type(hw) == ixgbe_media_type_fiber) {
+		speed = hw->phy.autoneg_advertised;
+		if (!speed) {
+			ixgbe_get_link_capabilities(hw, &speed, &autoneg);
+			/* setup the highest link when no autoneg */
+			if (!autoneg)
+				speed = IXGBE_LINK_SPEED_10GB_FULL;
+		}
+		ixgbe_setup_link(hw, speed, true);
+	}
+
 	/* check if it needs to wait to complete, if lsc interrupt is enabled */
 	if (wait_to_complete == 0 || dev->data->dev_conf.intr_conf.lsc != 0)
 		diag = ixgbe_check_link(hw, &link_speed, &link_up, 0);
@@ -3544,10 +3560,12 @@ ixgbe_dev_link_update(struct rte_eth_dev *dev, int wait_to_complete)
 
 	if (link_up == 0) {
 		rte_ixgbe_dev_atomic_write_link_status(dev, &link);
+		intr->flags |= IXGBE_FLAG_NEED_LINK_CONFIG;
 		if (link.link_status == old.link_status)
 			return -1;
 		return 0;
 	}
+	intr->flags &= ~IXGBE_FLAG_NEED_LINK_CONFIG;
 	link.link_status = ETH_LINK_UP;
 	link.link_duplex = ETH_LINK_FULL_DUPLEX;
 
diff --git a/drivers/net/ixgbe/ixgbe_ethdev.h b/drivers/net/ixgbe/ixgbe_ethdev.h
index a32ba4d..a6e8c8a 100644
--- a/drivers/net/ixgbe/ixgbe_ethdev.h
+++ b/drivers/net/ixgbe/ixgbe_ethdev.h
@@ -45,6 +45,7 @@
 #define IXGBE_FLAG_MAILBOX          (uint32_t)(1 << 1)
 #define IXGBE_FLAG_PHY_INTERRUPT    (uint32_t)(1 << 2)
 #define IXGBE_FLAG_MACSEC           (uint32_t)(1 << 3)
+#define IXGBE_FLAG_NEED_LINK_CONFIG (uint32_t)(1 << 4)
 
 /*
  * Defines that were not part of ixgbe_type.h as they are not used by the
-- 
2.1.4