[dpdk-stable] [PATCH v3] net/ice: fix link status recovery

[Qiming Yang <qiming.yang@intel.com>]

This patch fixes a kernel driver link status issue by recovering
link status when device stops.

Fixes: e6161345d8a9 ("net/ice: support link status change")
Cc: stable@dpdk.org

Signed-off-by: Qiming Yang <qiming.yang@intel.com>
---
 drivers/net/ice/ice_ethdev.c | 28 +++++++++++++++++++++++++++-
 drivers/net/ice/ice_ethdev.h |  1 +
 2 files changed, 28 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ice/ice_ethdev.c b/drivers/net/ice/ice_ethdev.c
index d746758..14ca5e6 100644
--- a/drivers/net/ice/ice_ethdev.c
+++ b/drivers/net/ice/ice_ethdev.c
@@ -2277,7 +2277,10 @@ ice_dev_stop(struct rte_eth_dev *dev)
 	/* Clear all queues and release mbufs */
 	ice_clear_queues(dev);
 
-	ice_dev_set_link_down(dev);
+	if (pf->init_link_status)
+		ice_dev_set_link_up(dev);
+	else
+		ice_dev_set_link_down(dev);
 
 	/* Clean datapath event and queue/vec mapping */
 	rte_intr_efd_disable(intr_handle);
@@ -2648,6 +2651,27 @@ ice_rxq_intr_setup(struct rte_eth_dev *dev)
 	return 0;
 }
 
+static void
+ice_get_init_link_status(struct rte_eth_dev *dev)
+{
+	struct ice_hw *hw = ICE_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+	struct ice_pf *pf = ICE_DEV_PRIVATE_TO_PF(dev->data->dev_private);
+	bool enable_lse = dev->data->dev_conf.intr_conf.lsc ? true : false;
+	struct ice_link_status link_status;
+	int ret;
+
+	ret = ice_aq_get_link_info(hw->port_info, enable_lse,
+				   &link_status, NULL);
+	if (ret != ICE_SUCCESS) {
+		PMD_DRV_LOG(ERR, "Failed to get link info");
+		pf->init_link_status = false;
+		return;
+	}
+
+	if (link_status.link_info & ICE_AQ_LINK_UP)
+		pf->init_link_status = true;
+}
+
 static int
 ice_dev_start(struct rte_eth_dev *dev)
 {
@@ -2717,6 +2741,8 @@ ice_dev_start(struct rte_eth_dev *dev)
 	if (ret != ICE_SUCCESS)
 		PMD_DRV_LOG(WARNING, "Fail to set phy mask");
 
+	ice_get_init_link_status(dev);
+
 	ice_dev_set_link_up(dev);
 
 	/* Call get_link_info aq commond to enable/disable LSE */
diff --git a/drivers/net/ice/ice_ethdev.h b/drivers/net/ice/ice_ethdev.h
index de67e59..27db4e7 100644
--- a/drivers/net/ice/ice_ethdev.h
+++ b/drivers/net/ice/ice_ethdev.h
@@ -369,6 +369,7 @@ struct ice_pf {
 	struct ice_parser_list rss_parser_list;
 	struct ice_parser_list perm_parser_list;
 	struct ice_parser_list dist_parser_list;
+	bool init_link_status;
 };
 
 #define ICE_MAX_QUEUE_NUM  2048
-- 
2.9.5