i40e: clear qtx_head before enabling Tx queue

Make sure the "new" qtx_head[q] register is cleared before
enabling the Tx queue.

Change-ID: I0c7a12815e343a5ae68807af172a35d6c6857935
Signed-off-by: Shannon Nelson <shannon.nelson@intel.com>
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Tested-by: Kavindya Deegala <kavindya.s.deegala@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index 65c27cb1e9ec..bc14a85561f8 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -3008,11 +3008,13 @@ static int i40e_vsi_control_tx(struct i40e_vsi *vsi, bool enable)
                         continue;
 
                 /* turn on/off the queue */
-                if (enable)
+                if (enable) {
+                        wr32(hw, I40E_QTX_HEAD(pf_q), 0);
                         tx_reg |= I40E_QTX_ENA_QENA_REQ_MASK |
                                   I40E_QTX_ENA_QENA_STAT_MASK;
-                else
+                } else {
                         tx_reg &= ~I40E_QTX_ENA_QENA_REQ_MASK;
+                }
 
                 wr32(hw, I40E_QTX_ENA(pf_q), tx_reg);