[Intel-wired-lan] [next PATCH S82-V4 6/9] i40e: Fix FLR reset timeout issue

[Alice Michael <alice.michael@intel.com>]

From: Filip Sadowski <filip.sadowski@intel.com>

This patch allows detection of upcoming core reset in case NIC gets
stuck while performing FLR reset. The i40e_pf_reset() function returns
I40E_ERR_NOT_READY when global reset was detected.

Signed-off-by: Filip Sadowski <filip.sadowski@intel.com>
---
 drivers/net/ethernet/intel/i40e/i40e_common.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_common.c b/drivers/net/ethernet/intel/i40e/i40e_common.c
index 5abc83c..40c5f76 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_common.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_common.c
@@ -1269,6 +1269,7 @@ i40e_status i40e_pf_reset(struct i40e_hw *hw)
 	 * we don't need to do the PF Reset
 	 */
 	if (!cnt) {
+		u32 reg2 = 0;
 		if (hw->revision_id == 0)
 			cnt = I40E_PF_RESET_WAIT_COUNT_A0;
 		else
@@ -1280,6 +1281,12 @@ i40e_status i40e_pf_reset(struct i40e_hw *hw)
 			reg = rd32(hw, I40E_PFGEN_CTRL);
 			if (!(reg & I40E_PFGEN_CTRL_PFSWR_MASK))
 				break;
+			reg2 = rd32(hw, I40E_GLGEN_RSTAT);
+			if (reg2 & I40E_GLGEN_RSTAT_DEVSTATE_MASK) {
+				hw_dbg(hw, "Core reset upcoming. Skipping PF reset request.\n");
+				hw_dbg(hw, "I40E_GLGEN_RSTAT = 0x%x\n", reg2);
+				return I40E_ERR_NOT_READY;
+			}
 			usleep_range(1000, 2000);
 		}
 		if (reg & I40E_PFGEN_CTRL_PFSWR_MASK) {
-- 
2.9.5