[PATCH 1/1] [SRU][X] i40e: change behavior on PF in response to MDD event

[Heitor Alves de Siqueira]

From: Carolyn Wyborny <carolyn.wyborny at intel.com>

BugLink: https://bugs.launchpad.net/bugs/1772675

TX MDD events reported on the PF are the result of the
PF misconfiguring a descriptor and not because of "bad actions"
by anything else.  No need to reset now because if it
results in a Tx hang, the Tx hang check will take care of it.

Signed-off-by: Carolyn Wyborny <carolyn.wyborny at intel.com>
Tested-by: Andrew Bowers <andrewx.bowers at intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher at intel.com>
(backported from commit a1df906c5be75ce2c7633e06c688607ec088ca35)
Signed-off-by: Heitor Alves de Siqueira <halves at canonical.com>
---
 drivers/net/ethernet/intel/i40e/i40e_main.c | 12 ++----------
 1 file changed, 2 insertions(+), 10 deletions(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index f12137a6e350..4e084fff0454 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -6974,7 +6974,6 @@ static void i40e_handle_mdd_event(struct i40e_pf *pf)
 {
 	struct i40e_hw *hw = &pf->hw;
 	bool mdd_detected = false;
-	bool pf_mdd_detected = false;
 	struct i40e_vf *vf;
 	u32 reg;
 	int i;
@@ -7020,19 +7019,12 @@ static void i40e_handle_mdd_event(struct i40e_pf *pf)
 		reg = rd32(hw, I40E_PF_MDET_TX);
 		if (reg & I40E_PF_MDET_TX_VALID_MASK) {
 			wr32(hw, I40E_PF_MDET_TX, 0xFFFF);
-			dev_info(&pf->pdev->dev, "TX driver issue detected, PF reset issued\n");
-			pf_mdd_detected = true;
+			dev_dbg(&pf->pdev->dev, "TX driver issue detected on PF\n");
 		}
 		reg = rd32(hw, I40E_PF_MDET_RX);
 		if (reg & I40E_PF_MDET_RX_VALID_MASK) {
 			wr32(hw, I40E_PF_MDET_RX, 0xFFFF);
-			dev_info(&pf->pdev->dev, "RX driver issue detected, PF reset issued\n");
-			pf_mdd_detected = true;
-		}
-		/* Queue belongs to the PF, initiate a reset */
-		if (pf_mdd_detected) {
-			set_bit(__I40E_PF_RESET_REQUESTED, &pf->state);
-			i40e_service_event_schedule(pf);
+			dev_dbg(&pf->pdev->dev, "RX driver issue detected on PF\n");
 		}
 	}
 
-- 
2.30.1