net/i40e/base: avoid reset timeout issue

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>

diff --git a/drivers/net/i40e/base/i40e_common.c b/drivers/net/i40e/base/i40e_common.c
index 78ed2a8..ed2e01a 100644 (file)
--- 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) {