From: Alexander Duyck <alexander.h.duyck@intel.com>
Date: Fri, 29 Dec 2017 08:48:53 -0500
Subject: i40e/i40evf: Record ITR register location in the q_vector
Patch-mainline: v4.16-rc1
Git-commit: a3f9fb5ef34e2f01a77a74c359e655b64cb1a6ae
References: bsc#1101816 FATE#325147 FATE#325149

The drivers for i40e and i40evf had a reg_idx value stored in the q_vector
that was going completely unused. I can only assume this was copied over
from ixgbe and nobody knew how to use it.

I'm going to make use of the value to avoid having to compute the vector
and thus the register index for multiple paths throughout the drivers.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/intel/i40e/i40e_main.c     |    1 +
 drivers/net/ethernet/intel/i40e/i40e_txrx.c     |   12 ++++--------
 drivers/net/ethernet/intel/i40evf/i40e_txrx.c   |   12 ++++--------
 drivers/net/ethernet/intel/i40evf/i40evf.h      |    4 ++--
 drivers/net/ethernet/intel/i40evf/i40evf_main.c |    1 +
 5 files changed, 12 insertions(+), 18 deletions(-)

--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -3948,6 +3948,7 @@ static void i40e_vsi_map_rings_to_vector
 		num_ringpairs = DIV_ROUND_UP(qp_remaining, q_vectors - v_start);
 
 		q_vector->num_ringpairs = num_ringpairs;
+		q_vector->reg_idx = q_vector->v_idx + vsi->base_vector - 1;
 
 		q_vector->rx.count = 0;
 		q_vector->tx.count = 0;
--- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
@@ -955,7 +955,7 @@ static void i40e_enable_wb_on_itr(struct
 		      I40E_PFINT_DYN_CTLN_ITR_INDX_MASK; /* set noitr */
 
 		wr32(&vsi->back->hw,
-		     I40E_PFINT_DYN_CTLN(q_vector->v_idx + vsi->base_vector - 1),
+		     I40E_PFINT_DYN_CTLN(q_vector->reg_idx),
 		     val);
 	} else {
 		val = I40E_PFINT_DYN_CTL0_WB_ON_ITR_MASK |
@@ -982,8 +982,7 @@ void i40e_force_wb(struct i40e_vsi *vsi,
 			  /* allow 00 to be written to the index */
 
 		wr32(&vsi->back->hw,
-		     I40E_PFINT_DYN_CTLN(q_vector->v_idx +
-					 vsi->base_vector - 1), val);
+		     I40E_PFINT_DYN_CTLN(q_vector->reg_idx), val);
 	} else {
 		u32 val = I40E_PFINT_DYN_CTL0_INTENA_MASK |
 			  I40E_PFINT_DYN_CTL0_ITR_INDX_MASK | /* set noitr */
@@ -2296,7 +2295,6 @@ static inline void i40e_update_enable_it
 	struct i40e_hw *hw = &vsi->back->hw;
 	bool rx = false, tx = false;
 	u32 rxval, txval;
-	int vector;
 	int idx = q_vector->v_idx;
 	int rx_itr_setting, tx_itr_setting;
 
@@ -2306,8 +2304,6 @@ static inline void i40e_update_enable_it
 		return;
 	}
 
-	vector = (q_vector->v_idx + vsi->base_vector);
-
 	/* avoid dynamic calculation if in countdown mode OR if
 	 * all dynamic is disabled
 	 */
@@ -2356,12 +2352,12 @@ static inline void i40e_update_enable_it
 		 */
 		rxval |= BIT(31);
 		/* don't check _DOWN because interrupt isn't being enabled */
-		wr32(hw, INTREG(vector - 1), rxval);
+		wr32(hw, INTREG(q_vector->reg_idx), rxval);
 	}
 
 enable_int:
 	if (!test_bit(__I40E_VSI_DOWN, vsi->state))
-		wr32(hw, INTREG(vector - 1), txval);
+		wr32(hw, INTREG(q_vector->reg_idx), txval);
 
 	if (q_vector->itr_countdown)
 		q_vector->itr_countdown--;
--- a/drivers/net/ethernet/intel/i40evf/i40e_txrx.c
+++ b/drivers/net/ethernet/intel/i40evf/i40e_txrx.c
@@ -369,8 +369,7 @@ static void i40e_enable_wb_on_itr(struct
 	      I40E_VFINT_DYN_CTLN1_ITR_INDX_MASK; /* set noitr */
 
 	wr32(&vsi->back->hw,
-	     I40E_VFINT_DYN_CTLN1(q_vector->v_idx +
-				  vsi->base_vector - 1), val);
+	     I40E_VFINT_DYN_CTLN1(q_vector->reg_idx), val);
 	q_vector->arm_wb_state = true;
 }
 
@@ -389,7 +388,7 @@ void i40evf_force_wb(struct i40e_vsi *vs
 		  /* allow 00 to be written to the index */;
 
 	wr32(&vsi->back->hw,
-	     I40E_VFINT_DYN_CTLN1(q_vector->v_idx + vsi->base_vector - 1),
+	     I40E_VFINT_DYN_CTLN1(q_vector->reg_idx),
 	     val);
 }
 
@@ -1498,12 +1497,9 @@ static inline void i40e_update_enable_it
 	struct i40e_hw *hw = &vsi->back->hw;
 	bool rx = false, tx = false;
 	u32 rxval, txval;
-	int vector;
 	int idx = q_vector->v_idx;
 	int rx_itr_setting, tx_itr_setting;
 
-	vector = (q_vector->v_idx + vsi->base_vector);
-
 	/* avoid dynamic calculation if in countdown mode OR if
 	 * all dynamic is disabled
 	 */
@@ -1552,12 +1548,12 @@ static inline void i40e_update_enable_it
 		 */
 		rxval |= BIT(31);
 		/* don't check _DOWN because interrupt isn't being enabled */
-		wr32(hw, INTREG(vector - 1), rxval);
+		wr32(hw, INTREG(q_vector->reg_idx), rxval);
 	}
 
 enable_int:
 	if (!test_bit(__I40E_VSI_DOWN, vsi->state))
-		wr32(hw, INTREG(vector - 1), txval);
+		wr32(hw, INTREG(q_vector->reg_idx), txval);
 
 	if (q_vector->itr_countdown)
 		q_vector->itr_countdown--;
--- a/drivers/net/ethernet/intel/i40evf/i40evf.h
+++ b/drivers/net/ethernet/intel/i40evf/i40evf.h
@@ -114,14 +114,14 @@ struct i40e_q_vector {
 	struct i40evf_adapter *adapter;
 	struct i40e_vsi *vsi;
 	struct napi_struct napi;
-	unsigned long reg_idx;
 	struct i40e_ring_container rx;
 	struct i40e_ring_container tx;
 	u32 ring_mask;
 	u8 num_ringpairs;	/* total number of ring pairs in vector */
 #define ITR_COUNTDOWN_START 100
 	u8 itr_countdown;	/* when 0 or 1 update ITR */
-	int v_idx;	/* vector index in list */
+	u16 v_idx;		/* index in the vsi->q_vector array. */
+	u16 reg_idx;		/* register index of the interrupt */
 	char name[IFNAMSIZ + 15];
 	bool arm_wb_state;
 	cpumask_t affinity_mask;
--- a/drivers/net/ethernet/intel/i40evf/i40evf_main.c
+++ b/drivers/net/ethernet/intel/i40evf/i40evf_main.c
@@ -1387,6 +1387,7 @@ static int i40evf_alloc_q_vectors(struct
 		q_vector->adapter = adapter;
 		q_vector->vsi = &adapter->vsi;
 		q_vector->v_idx = q_idx;
+		q_vector->reg_idx = q_idx;
 		cpumask_copy(&q_vector->affinity_mask, cpu_possible_mask);
 		netif_napi_add(adapter->netdev, &q_vector->napi,
 			       i40evf_napi_poll, NAPI_POLL_WEIGHT);