[dpdk-dev] [PATCH] ixgbe_vf: Fix getting link state

[Balazs Nemeth <balazs.nemeth@intel.com>]

This patch fixes checking the link state of a virtual function. If the
state has already been checked, it does not need to be checked
again. Previously, get_link_status in the ixgbe_hw struct was
used to track if the information had already been updated, but this
field was always set to false.

Signed-off-by: Balazs Nemeth <balazs.nemeth@intel.com>
---
 lib/librte_pmd_ixgbe/ixgbe/ixgbe_type.h |  2 +-
 lib/librte_pmd_ixgbe/ixgbe/ixgbe_vf.c   | 14 ++++++++------
 lib/librte_pmd_ixgbe/ixgbe_ethdev.c     |  8 +++++++-
 3 files changed, 16 insertions(+), 8 deletions(-)

diff --git a/lib/librte_pmd_ixgbe/ixgbe/ixgbe_type.h b/lib/librte_pmd_ixgbe/ixgbe/ixgbe_type.h
index c67d462..07bba75 100644
--- a/lib/librte_pmd_ixgbe/ixgbe/ixgbe_type.h
+++ b/lib/librte_pmd_ixgbe/ixgbe/ixgbe_type.h
@@ -3573,7 +3573,7 @@ struct ixgbe_mac_info {
 	u32 max_rx_queues;
 	u32 orig_autoc;
 	u8  san_mac_rar_index;
-	bool get_link_status;
+	bool have_link_status;
 	u32 orig_autoc2;
 	u16 max_msix_vectors;
 	bool arc_subsystem_valid;
diff --git a/lib/librte_pmd_ixgbe/ixgbe/ixgbe_vf.c b/lib/librte_pmd_ixgbe/ixgbe/ixgbe_vf.c
index e6b6c51..6cc7d7f 100644
--- a/lib/librte_pmd_ixgbe/ixgbe/ixgbe_vf.c
+++ b/lib/librte_pmd_ixgbe/ixgbe/ixgbe_vf.c
@@ -550,10 +550,13 @@ s32 ixgbe_check_mac_link_vf(struct ixgbe_hw *hw, ixgbe_link_speed *speed,
 	UNREFERENCED_1PARAMETER(autoneg_wait_to_complete);
 
 	/* If we were hit with a reset drop the link */
-	if (!mbx->ops.check_for_rst(hw, 0) || !mbx->timeout)
-		mac->get_link_status = true;
+	if (!mbx->ops.check_for_rst(hw, 0) || !mbx->timeout) {
+		mac->have_link_status = false;
+		ret_val = -1;
+		goto out;
+	}
 
-	if (!mac->get_link_status)
+	if (mac->have_link_status)
 		goto out;
 
 	/* if link status is down no point in checking to see if pf is up */
@@ -610,10 +613,10 @@ s32 ixgbe_check_mac_link_vf(struct ixgbe_hw *hw, ixgbe_link_speed *speed,
 	/* if we passed all the tests above then the link is up and we no
 	 * longer need to check for link
 	 */
-	mac->get_link_status = false;
+	mac->have_link_status = true;
 
 out:
-	*link_up = !mac->get_link_status;
+	*link_up = mac->have_link_status;
 	return ret_val;
 }
 
@@ -722,4 +725,3 @@ int ixgbevf_get_queues(struct ixgbe_hw *hw, unsigned int *num_tcs,
 
 	return err;
 }
-
diff --git a/lib/librte_pmd_ixgbe/ixgbe_ethdev.c b/lib/librte_pmd_ixgbe/ixgbe_ethdev.c
index 9401916..8e622ee 100644
--- a/lib/librte_pmd_ixgbe/ixgbe_ethdev.c
+++ b/lib/librte_pmd_ixgbe/ixgbe_ethdev.c
@@ -2064,7 +2064,7 @@ 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 link_speed = IXGBE_LINK_SPEED_UNKNOWN;
 	int link_up;
 	int diag;
 
@@ -2088,6 +2088,12 @@ ixgbe_dev_link_update(struct rte_eth_dev *dev, int wait_to_complete)
 		return 0;
 	}
 
+	if (link_speed == IXGBE_LINK_SPEED_UNKNOWN &&
+	    hw->mac.have_link_status) {
+		memcpy(&link, &old, sizeof(link));
+		return 0;
+	}
+
 	if (link_up == 0) {
 		rte_ixgbe_dev_atomic_write_link_status(dev, &link);
 		if (link.link_status == old.link_status)
-- 
2.1.3