[dpdk-dev] [PATCH v4 13/17] net/i40e/base: avoid reset timeout issue

[Jingjing Wu <jingjing.wu@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: Jingjing Wu <jingjing.wu@intel.com>
---
 drivers/net/i40e/base/i40e_common.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/net/i40e/base/i40e_common.c b/drivers/net/i40e/base/i40e_common.c
index 78ed2a8..ed2e01a 100644
--- a/drivers/net/i40e/base/i40e_common.c
+++ b/drivers/net/i40e/base/i40e_common.c
@@ -1382,6 +1382,8 @@ enum i40e_status_code i40e_pf_reset(struct i40e_hw *hw)
 	 * we don't need to do the PF Reset
 	 */
 	if (!cnt) {
+		u32 reg2 = 0;
+
 		reg = rd32(hw, I40E_PFGEN_CTRL);
 		wr32(hw, I40E_PFGEN_CTRL,
 		     (reg | I40E_PFGEN_CTRL_PFSWR_MASK));
@@ -1389,6 +1391,12 @@ enum i40e_status_code 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) {
+				DEBUGOUT("Core reset upcoming.\n");
+				DEBUGOUT1("I40E_GLGEN_RSTAT = 0x%x\n", reg2);
+				return I40E_ERR_NOT_READY;
+			}
 			i40e_msec_delay(1);
 		}
 		if (reg & I40E_PFGEN_CTRL_PFSWR_MASK) {
-- 
2.4.11