[PATCH v2] net/ice: fix link update

[Qi Zhang <qi.z.zhang@intel.com>]

The ice_aq_get_link_info function is not thread-safe. However,
it is possible to simultaneous invocations during both the dev_start
and the LSC interrupt handler, potentially leading to unexpected adminq
errors. This patch addresses the issue by introducing a thread-safe
wrapper that utilizes a spinlock.

Fixes: cf911d90e366 ("net/ice: support link update")
Cc: stable@dpdk.org

Signed-off-by: Qi Zhang <qi.z.zhang@intel.com>
---
v2:
- fix coding style warning.

 drivers/net/ice/ice_ethdev.c | 26 ++++++++++++++++++++------
 drivers/net/ice/ice_ethdev.h |  4 ++++
 2 files changed, 24 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ice/ice_ethdev.c b/drivers/net/ice/ice_ethdev.c
index 3ccba4db80..1f8ab5158a 100644
--- a/drivers/net/ice/ice_ethdev.c
+++ b/drivers/net/ice/ice_ethdev.c
@@ -1804,6 +1804,7 @@ ice_pf_setup(struct ice_pf *pf)
 	}
 
 	pf->main_vsi = vsi;
+	rte_spinlock_init(&pf->link_lock);
 
 	return 0;
 }
@@ -3621,17 +3622,31 @@ ice_rxq_intr_setup(struct rte_eth_dev *dev)
 	return 0;
 }
 
+static enum ice_status
+ice_get_link_info_safe(struct ice_pf *pf, bool ena_lse,
+		       struct ice_link_status *link)
+{
+	struct ice_hw *hw = ICE_PF_TO_HW(pf);
+	int ret;
+
+	rte_spinlock_lock(&pf->link_lock);
+
+	ret = ice_aq_get_link_info(hw->port_info, ena_lse, link, NULL);
+
+	rte_spinlock_unlock(&pf->link_lock);
+
+	return ret;
+}
+
 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);
+	ret = ice_get_link_info_safe(pf, enable_lse, &link_status);
 	if (ret != ICE_SUCCESS) {
 		PMD_DRV_LOG(ERR, "Failed to get link info");
 		pf->init_link_up = false;
@@ -3996,7 +4011,7 @@ ice_link_update(struct rte_eth_dev *dev, int wait_to_complete)
 {
 #define CHECK_INTERVAL 50  /* 50ms */
 #define MAX_REPEAT_TIME 40  /* 2s (40 * 50ms) in total */
-	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);
 	struct ice_link_status link_status;
 	struct rte_eth_link link, old;
 	int status;
@@ -4010,8 +4025,7 @@ ice_link_update(struct rte_eth_dev *dev, int wait_to_complete)
 
 	do {
 		/* Get link status information from hardware */
-		status = ice_aq_get_link_info(hw->port_info, enable_lse,
-					      &link_status, NULL);
+		status = ice_get_link_info_safe(pf, enable_lse, &link_status);
 		if (status != ICE_SUCCESS) {
 			link.link_speed = RTE_ETH_SPEED_NUM_100M;
 			link.link_duplex = RTE_ETH_LINK_FULL_DUPLEX;
diff --git a/drivers/net/ice/ice_ethdev.h b/drivers/net/ice/ice_ethdev.h
index abe6dcdc23..d607f028e0 100644
--- a/drivers/net/ice/ice_ethdev.h
+++ b/drivers/net/ice/ice_ethdev.h
@@ -548,6 +548,10 @@ struct ice_pf {
 	uint64_t rss_hf;
 	struct ice_tm_conf tm_conf;
 	uint16_t outer_ethertype;
+	/* lock prevent race condition between lsc interrupt handler
+	 * and link status update during dev_start.
+	 */
+	rte_spinlock_t link_lock;
 };
 
 #define ICE_MAX_QUEUE_NUM  2048
-- 
2.31.1