[net-next 14/18] i40e: Added code to prevent double resets

[Jeff Kirsher]

From: Mitch Williams <mitch.a.willi...@intel.com>

Clear the VFLR bit after reset processing, instead of before. This
prevents double resets on VF init.

Signed-off-by: Mitch Williams <mitch.a.willi...@intel.com>
Tested-by: Andrew Bowers <andrewx.bow...@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirs...@intel.com>
---
 drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c 
b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
index 816c6bb..291d628 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
@@ -917,9 +917,9 @@ void i40e_reset_vf(struct i40e_vf *vf, bool flr)
 {
        struct i40e_pf *pf = vf->pf;
        struct i40e_hw *hw = &pf->hw;
+       u32 reg, reg_idx, bit_idx;
        bool rsd = false;
        int i;
-       u32 reg;
 
        if (test_and_set_bit(__I40E_VF_DISABLE, &pf->state))
                return;
@@ -988,6 +988,11 @@ complete_reset:
        }
        /* tell the VF the reset is done */
        wr32(hw, I40E_VFGEN_RSTAT1(vf->vf_id), I40E_VFR_VFACTIVE);
+
+       /* clear the VFLR bit in GLGEN_VFLRSTAT */
+       reg_idx = (hw->func_caps.vf_base_id + vf->vf_id) / 32;
+       bit_idx = (hw->func_caps.vf_base_id + vf->vf_id) % 32;
+       wr32(hw, I40E_GLGEN_VFLRSTAT(reg_idx), BIT(bit_idx));
        i40e_flush(hw);
        clear_bit(__I40E_VF_DISABLE, &pf->state);
 }
@@ -2293,9 +2298,7 @@ int i40e_vc_process_vflr_event(struct i40e_pf *pf)
                vf = &pf->vf[vf_id];
                reg = rd32(hw, I40E_GLGEN_VFLRSTAT(reg_idx));
                if (reg & BIT(bit_idx)) {
-                       /* clear the bit in GLGEN_VFLRSTAT */
-                       wr32(hw, I40E_GLGEN_VFLRSTAT(reg_idx), BIT(bit_idx));
-
+                       /* i40e_reset_vf will clear the bit in GLGEN_VFLRSTAT */
                        if (!test_bit(__I40E_DOWN, &pf->state))
                                i40e_reset_vf(vf, true);
                }
-- 
2.5.5