netdev - [PATCH net-next 09/12] ixgbe: turn off MDD while modifying SRRCTL

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Message-ID: <20250703174242.3829277-10-anthony.l.nguyen@intel.com>
Date: Thu,  3 Jul 2025 10:42:36 -0700
From: Tony Nguyen <anthony.l.nguyen@...el.com>
To: davem@...emloft.net,
	kuba@...nel.org,
	pabeni@...hat.com,
	edumazet@...gle.com,
	andrew+netdev@...n.ch,
	netdev@...r.kernel.org
Cc: Radoslaw Tyl <radoslawx.tyl@...el.com>,
	anthony.l.nguyen@...el.com,
	jedrzej.jagielski@...el.com,
	przemyslaw.kitszel@...el.com,
	dawid.osuchowski@...el.com,
	piotr.kwapulinski@...el.com,
	marcin.szycik@...ux.intel.com,
	horms@...nel.org,
	Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>,
	Rafal Romanowski <rafal.romanowski@...el.com>
Subject: [PATCH net-next 09/12] ixgbe: turn off MDD while modifying SRRCTL

From: Radoslaw Tyl <radoslawx.tyl@...el.com>

Modifying SRRCTL register can generate MDD event.

Turn MDD off during SRRCTL register write to prevent generating MDD.

Fix RCT in ixgbe_set_rx_drop_en().

Reviewed-by: Marcin Szycik <marcin.szycik@...ux.intel.com>
Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@...el.com>
Signed-off-by: Radoslaw Tyl <radoslawx.tyl@...el.com>
Signed-off-by: Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>
Reviewed-by: Simon Horman <horms@...nel.org>
Tested-by: Rafal Romanowski <rafal.romanowski@...el.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@...el.com>
---
 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index f1c51ddbaf9e..4f2d7f6e3faa 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -4104,8 +4104,12 @@ void ixgbe_set_rx_drop_en(struct ixgbe_adapter *adapter)
 static void ixgbe_set_rx_drop_en(struct ixgbe_adapter *adapter)
 #endif
 {
-	int i;
 	bool pfc_en = adapter->dcb_cfg.pfc_mode_enable;
+	struct ixgbe_hw *hw = &adapter->hw;
+	int i;
+
+	if (hw->mac.ops.disable_mdd)
+		hw->mac.ops.disable_mdd(hw);
 
 	if (adapter->ixgbe_ieee_pfc)
 		pfc_en |= !!(adapter->ixgbe_ieee_pfc->pfc_en);
@@ -4127,6 +4131,9 @@ static void ixgbe_set_rx_drop_en(struct ixgbe_adapter *adapter)
 		for (i = 0; i < adapter->num_rx_queues; i++)
 			ixgbe_disable_rx_drop(adapter, adapter->rx_ring[i]);
 	}
+
+	if (hw->mac.ops.enable_mdd)
+		hw->mac.ops.enable_mdd(hw);
 }
 
 #define IXGBE_SRRCTL_BSIZEHDRSIZE_SHIFT 2
-- 
2.47.1