i40e/i40evf: fix accidental write to ITR registers

Fix a bug introduced in the force writeback code, where the interrupt
rate was set to 0 (maximum) by accident.

The driver must correctly set the NOITR fields to avoid ITR update
as a side effect of triggering the software interrupt.

Change-ID: I290851ae04ef3811c43aab5ee33242029f26c1a3
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: Anjali Singhai Jain <anjali.singhai@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/i40e/i40e_txrx.c

@@ -859,6 +859,7 @@ static bool i40e_clean_tx_irq(struct i40e_ring *tx_ring, int budget)
 static void i40e_force_wb(struct i40e_vsi *vsi, struct i40e_q_vector *q_vector)
 {
 	u32 val = I40E_PFINT_DYN_CTLN_INTENA_MASK |
+		  I40E_PFINT_DYN_CTLN_ITR_INDX_MASK | /* set noitr */
 		  I40E_PFINT_DYN_CTLN_SWINT_TRIG_MASK |
 		  I40E_PFINT_DYN_CTLN_SW_ITR_INDX_ENA_MASK;
 		  /* allow 00 to be written to the index */

drivers/net/ethernet/intel/i40evf/i40e_txrx.c

@@ -371,6 +371,7 @@ static bool i40e_clean_tx_irq(struct i40e_ring *tx_ring, int budget)
 static void i40e_force_wb(struct i40e_vsi *vsi, struct i40e_q_vector *q_vector)
 {
 	u32 val = I40E_VFINT_DYN_CTLN_INTENA_MASK |
+		  I40E_VFINT_DYN_CTLN1_ITR_INDX_MASK | /* set noitr */
 		  I40E_VFINT_DYN_CTLN_SWINT_TRIG_MASK |
 		  I40E_VFINT_DYN_CTLN_SW_ITR_INDX_ENA_MASK;
 		  /* allow 00 to be written to the index */

drivers/net/ethernet/intel/i40evf/i40evf_main.c

@@ -244,6 +244,7 @@ void i40evf_irq_enable_queues(struct i40evf_adapter *adapter, u32 mask)
 		if (mask & (1 << (i - 1))) {
 			wr32(hw, I40E_VFINT_DYN_CTLN1(i - 1),
 			     I40E_VFINT_DYN_CTLN1_INTENA_MASK |
+			     I40E_VFINT_DYN_CTLN1_ITR_INDX_MASK |
 			     I40E_VFINT_DYN_CTLN_CLEARPBA_MASK);
 		}
 	}
@@ -263,6 +264,7 @@ static void i40evf_fire_sw_int(struct i40evf_adapter *adapter, u32 mask)
 	if (mask & 1) {
 		dyn_ctl = rd32(hw, I40E_VFINT_DYN_CTL01);
 		dyn_ctl |= I40E_VFINT_DYN_CTLN_SWINT_TRIG_MASK |
+			   I40E_VFINT_DYN_CTLN1_ITR_INDX_MASK |
 			   I40E_VFINT_DYN_CTLN_CLEARPBA_MASK;
 		wr32(hw, I40E_VFINT_DYN_CTL01, dyn_ctl);
 	}
@@ -270,6 +272,7 @@ static void i40evf_fire_sw_int(struct i40evf_adapter *adapter, u32 mask)
 		if (mask & (1 << i)) {
 			dyn_ctl = rd32(hw, I40E_VFINT_DYN_CTLN1(i - 1));
 			dyn_ctl |= I40E_VFINT_DYN_CTLN_SWINT_TRIG_MASK |
+				   I40E_VFINT_DYN_CTLN1_ITR_INDX_MASK |
 				   I40E_VFINT_DYN_CTLN_CLEARPBA_MASK;
 			wr32(hw, I40E_VFINT_DYN_CTLN1(i - 1), dyn_ctl);
 		}