[[RFC xdp-hints] 08/16] igc: Use irq safe locks for timestamping

[Ederson de Souza <ederson.desouza@intel.com>]

From: Vinicius Costa Gomes <vinicius.gomes@intel.com>

Now that the timestamping is done in interrupt context we should
protect against concurrent access using irq safe locks.

Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>
---
 drivers/net/ethernet/intel/igc/igc_main.c |  5 +++--
 drivers/net/ethernet/intel/igc/igc_ptp.c  | 16 ++++++++++------
 2 files changed, 13 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c
index a2e0b71d1f4e..fe3619c25c05 100644
--- a/drivers/net/ethernet/intel/igc/igc_main.c
+++ b/drivers/net/ethernet/intel/igc/igc_main.c
@@ -1467,9 +1467,10 @@ static netdev_tx_t igc_xmit_frame_ring(struct sk_buff *skb,
 
 	if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP)) {
 		struct igc_adapter *adapter = netdev_priv(tx_ring->netdev);
+		unsigned long flags;
 		u32 tstamp_flags;
 
-		spin_lock(&adapter->ptp_tx_lock);
+		spin_lock_irqsave(&adapter->ptp_tx_lock, flags);
 
 		if (adapter->tstamp_config.tx_type == HWTSTAMP_TX_ON &&
 		    igc_request_tx_tstamp(adapter, skb, &tstamp_flags)) {
@@ -1479,7 +1480,7 @@ static netdev_tx_t igc_xmit_frame_ring(struct sk_buff *skb,
 			adapter->tx_hwtstamp_skipped++;
 		}
 
-		spin_unlock(&adapter->ptp_tx_lock);
+		spin_unlock_irqrestore(&adapter->ptp_tx_lock, flags);
 	}
 
 	if (skb_vlan_tag_present(skb)) {
diff --git a/drivers/net/ethernet/intel/igc/igc_ptp.c b/drivers/net/ethernet/intel/igc/igc_ptp.c
index e286b0341575..911c36a909a4 100644
--- a/drivers/net/ethernet/intel/igc/igc_ptp.c
+++ b/drivers/net/ethernet/intel/igc/igc_ptp.c
@@ -626,9 +626,10 @@ static void igc_ptp_tx_timeout(struct igc_adapter *adapter,
 void igc_ptp_tx_hang(struct igc_adapter *adapter)
 {
 	struct igc_tx_timestamp_request *tstamp;
+	unsigned long flags;
 	int i;
 
-	spin_lock(&adapter->ptp_tx_lock);
+	spin_lock_irqsave(&adapter->ptp_tx_lock, flags);
 
 	for (i = 0; i < IGC_MAX_TX_TSTAMP_TIMERS; i++) {
 		tstamp = &adapter->tx_tstamp[i];
@@ -642,7 +643,7 @@ void igc_ptp_tx_hang(struct igc_adapter *adapter)
 		igc_ptp_tx_timeout(adapter, tstamp);
 	}
 
-	spin_unlock(&adapter->ptp_tx_lock);
+	spin_unlock_irqrestore(&adapter->ptp_tx_lock, flags);
 }
 
 /**
@@ -659,13 +660,14 @@ void igc_ptp_tx_hwtstamp(struct igc_adapter *adapter, u32 mask)
 {
 	struct skb_shared_hwtstamps shhwtstamps;
 	struct igc_hw *hw = &adapter->hw;
+	unsigned long flags;
 	struct sk_buff *skb;
 	int adjust = 0;
 	u64 regval;
 	int i;
 
 again:
-	spin_lock(&adapter->ptp_tx_lock);
+	spin_lock_irqsave(&adapter->ptp_tx_lock, flags);
 
 	for (i = 0; i < IGC_MAX_TX_TSTAMP_TIMERS; i++) {
 		struct igc_tx_timestamp_request *tstamp = &adapter->tx_tstamp[i];
@@ -712,7 +714,7 @@ void igc_ptp_tx_hwtstamp(struct igc_adapter *adapter, u32 mask)
 		dev_kfree_skb_any(skb);
 	}
 
-	spin_unlock(&adapter->ptp_tx_lock);
+	spin_unlock_irqrestore(&adapter->ptp_tx_lock, flags);
 
 	mask = rd32(IGC_TSYNCTXCTL) & IGC_TSYNCTXCTL_TXTT_ANY;
 	if (mask) {
@@ -896,14 +898,16 @@ static void igc_tx_tstamp_clear(struct igc_adapter *adapter)
  */
 void igc_ptp_suspend(struct igc_adapter *adapter)
 {
+	unsigned long flags;
+
 	if (!(adapter->ptp_flags & IGC_PTP_ENABLED))
 		return;
 
-	spin_lock(&adapter->ptp_tx_lock);
+	spin_lock_irqsave(&adapter->ptp_tx_lock, flags);
 
 	igc_tx_tstamp_clear(adapter);
 
-	spin_unlock(&adapter->ptp_tx_lock);
+	spin_unlock_irqrestore(&adapter->ptp_tx_lock, flags);
 
 	igc_ptp_time_save(adapter);
 }
-- 
2.32.0