i40e/i40evf: control auto ITR through ethtool

For all of our supported kernels, ethtool allows us to directly control
adaptive ITR instead of just faking it with an ITR value. Support this
capability so that user knows explicitly when ITR is being controlled
dynamically. Suggested by Ben Hutchings.

CC: Ben Hutchings <ben@decadent.org.uk>
Change-ID: Iae6b79c5db767a63d22ecd9a9c24acaff02a096e
Signed-off-by: Mitch Williams <mitch.a.williams@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

2 files changed, 52 insertions, 70 deletions

diff --git a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
index f62929419a09..a89b3c6d55aa 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
@@ -1009,14 +1009,13 @@ static int i40e_get_coalesce(struct net_device *netdev,
 	ec->rx_max_coalesced_frames_irq = vsi->work_limit;
 
 	if (ITR_IS_DYNAMIC(vsi->rx_itr_setting))
-		ec->rx_coalesce_usecs = 1;
-	else
-		ec->rx_coalesce_usecs = vsi->rx_itr_setting;
+		ec->use_adaptive_rx_coalesce = 1;
 
 	if (ITR_IS_DYNAMIC(vsi->tx_itr_setting))
-		ec->tx_coalesce_usecs = 1;
-	else
-		ec->tx_coalesce_usecs = vsi->tx_itr_setting;
+		ec->use_adaptive_tx_coalesce = 1;
+
+	ec->rx_coalesce_usecs = vsi->rx_itr_setting & ~I40E_ITR_DYNAMIC;
+	ec->tx_coalesce_usecs = vsi->tx_itr_setting & ~I40E_ITR_DYNAMIC;
 
 	return 0;
 }
@@ -1035,37 +1034,27 @@ static int i40e_set_coalesce(struct net_device *netdev,
 	if (ec->tx_max_coalesced_frames_irq || ec->rx_max_coalesced_frames_irq)
 		vsi->work_limit = ec->tx_max_coalesced_frames_irq;
 
-	switch (ec->rx_coalesce_usecs) {
-	case 0:
-		vsi->rx_itr_setting = 0;
-		break;
-	case 1:
-		vsi->rx_itr_setting = (I40E_ITR_DYNAMIC |
-				       ITR_REG_TO_USEC(I40E_ITR_RX_DEF));
-		break;
-	default:
-		if ((ec->rx_coalesce_usecs < (I40E_MIN_ITR << 1)) ||
-		    (ec->rx_coalesce_usecs > (I40E_MAX_ITR << 1)))
-			return -EINVAL;
+	if ((ec->rx_coalesce_usecs >= (I40E_MIN_ITR << 1)) &&
+	    (ec->rx_coalesce_usecs <= (I40E_MAX_ITR << 1)))
 		vsi->rx_itr_setting = ec->rx_coalesce_usecs;
-		break;
-	}
+	else
+		return -EINVAL;
 
-	switch (ec->tx_coalesce_usecs) {
-	case 0:
-		vsi->tx_itr_setting = 0;
-		break;
-	case 1:
-		vsi->tx_itr_setting = (I40E_ITR_DYNAMIC |
-				       ITR_REG_TO_USEC(I40E_ITR_TX_DEF));
-		break;
-	default:
-		if ((ec->tx_coalesce_usecs < (I40E_MIN_ITR << 1)) ||
-		    (ec->tx_coalesce_usecs > (I40E_MAX_ITR << 1)))
-			return -EINVAL;
+	if ((ec->tx_coalesce_usecs >= (I40E_MIN_ITR << 1)) &&
+	    (ec->tx_coalesce_usecs <= (I40E_MAX_ITR << 1)))
 		vsi->tx_itr_setting = ec->tx_coalesce_usecs;
-		break;
-	}
+	else
+		return -EINVAL;
+
+	if (ec->use_adaptive_rx_coalesce)
+		vsi->rx_itr_setting |= I40E_ITR_DYNAMIC;
+	else
+		vsi->rx_itr_setting &= ~I40E_ITR_DYNAMIC;
+
+	if (ec->use_adaptive_tx_coalesce)
+		vsi->tx_itr_setting |= I40E_ITR_DYNAMIC;
+	else
+		vsi->tx_itr_setting &= ~I40E_ITR_DYNAMIC;
 
 	vector = vsi->base_vector;
 	for (i = 0; i < vsi->num_q_vectors; i++, vector++) {
diff --git a/drivers/net/ethernet/intel/i40evf/i40evf_ethtool.c b/drivers/net/ethernet/intel/i40evf/i40evf_ethtool.c
index c079166f04f9..df4dcfd364d8 100644
--- a/drivers/net/ethernet/intel/i40evf/i40evf_ethtool.c
+++ b/drivers/net/ethernet/intel/i40evf/i40evf_ethtool.c
@@ -295,14 +295,13 @@ static int i40evf_get_coalesce(struct net_device *netdev,
 	ec->rx_max_coalesced_frames = vsi->work_limit;
 
 	if (ITR_IS_DYNAMIC(vsi->rx_itr_setting))
-		ec->rx_coalesce_usecs = 1;
-	else
-		ec->rx_coalesce_usecs = vsi->rx_itr_setting;
+		ec->use_adaptive_rx_coalesce = 1;
 
 	if (ITR_IS_DYNAMIC(vsi->tx_itr_setting))
-		ec->tx_coalesce_usecs = 1;
-	else
-		ec->tx_coalesce_usecs = vsi->tx_itr_setting;
+		ec->use_adaptive_tx_coalesce = 1;
+
+	ec->rx_coalesce_usecs = vsi->rx_itr_setting & ~I40E_ITR_DYNAMIC;
+	ec->tx_coalesce_usecs = vsi->tx_itr_setting & ~I40E_ITR_DYNAMIC;
 
 	return 0;
 }
@@ -323,40 +322,34 @@ static int i40evf_set_coalesce(struct net_device *netdev,
 	struct i40e_q_vector *q_vector;
 	int i;
 
-	if (ec->tx_max_coalesced_frames || ec->rx_max_coalesced_frames)
-		vsi->work_limit = ec->tx_max_coalesced_frames;
+	if (ec->tx_max_coalesced_frames_irq || ec->rx_max_coalesced_frames_irq)
+		vsi->work_limit = ec->tx_max_coalesced_frames_irq;
 
-	switch (ec->rx_coalesce_usecs) {
-	case 0:
-		vsi->rx_itr_setting = 0;
-		break;
-	case 1:
-		vsi->rx_itr_setting = (I40E_ITR_DYNAMIC
-				       | ITR_REG_TO_USEC(I40E_ITR_RX_DEF));
-		break;
-	default:
-		if ((ec->rx_coalesce_usecs < (I40E_MIN_ITR << 1)) ||
-		    (ec->rx_coalesce_usecs > (I40E_MAX_ITR << 1)))
-			return -EINVAL;
+	if ((ec->rx_coalesce_usecs >= (I40E_MIN_ITR << 1)) &&
+	    (ec->rx_coalesce_usecs <= (I40E_MAX_ITR << 1)))
 		vsi->rx_itr_setting = ec->rx_coalesce_usecs;
-		break;
-	}
 
-	switch (ec->tx_coalesce_usecs) {
-	case 0:
-		vsi->tx_itr_setting = 0;
-		break;
-	case 1:
-		vsi->tx_itr_setting = (I40E_ITR_DYNAMIC
-				       | ITR_REG_TO_USEC(I40E_ITR_TX_DEF));
-		break;
-	default:
-		if ((ec->tx_coalesce_usecs < (I40E_MIN_ITR << 1)) ||
-		    (ec->tx_coalesce_usecs > (I40E_MAX_ITR << 1)))
-			return -EINVAL;
+	else
+		return -EINVAL;
+
+	if ((ec->tx_coalesce_usecs >= (I40E_MIN_ITR << 1)) &&
+	    (ec->tx_coalesce_usecs <= (I40E_MAX_ITR << 1)))
 		vsi->tx_itr_setting = ec->tx_coalesce_usecs;
-		break;
-	}
+	else if (ec->use_adaptive_tx_coalesce)
+		vsi->tx_itr_setting = (I40E_ITR_DYNAMIC |
+				       ITR_REG_TO_USEC(I40E_ITR_RX_DEF));
+	else
+		return -EINVAL;
+
+	if (ec->use_adaptive_rx_coalesce)
+		vsi->rx_itr_setting |= I40E_ITR_DYNAMIC;
+	else
+		vsi->rx_itr_setting &= ~I40E_ITR_DYNAMIC;
+
+	if (ec->use_adaptive_tx_coalesce)
+		vsi->tx_itr_setting |= I40E_ITR_DYNAMIC;
+	else
+		vsi->tx_itr_setting &= ~I40E_ITR_DYNAMIC;
 
 	for (i = 0; i < adapter->num_msix_vectors - NONQ_VECS; i++) {
 		q_vector = adapter->q_vector[i];