ixgbe: Allow tx itr specific settings

Allow the user to set Tx specific itr values.  This only makes sense
when there are separate vectors for Tx and Rx.  When the queues are
doubled up RxTx on the vectors, we still only use the rx itr value.

Signed-off-by: Shannon Nelson <shannon.nelson@intel.com>
Acked-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 61 insertions, 14 deletions

diff --git a/drivers/net/ixgbe/ixgbe_ethtool.c b/drivers/net/ixgbe/ixgbe_ethtool.c
index 026e94a9984..53b0a668025 100644
--- a/drivers/net/ixgbe/ixgbe_ethtool.c
+++ b/drivers/net/ixgbe/ixgbe_ethtool.c
@@ -1929,7 +1929,7 @@ static int ixgbe_get_coalesce(struct net_device *netdev,
 	ec->tx_max_coalesced_frames_irq = adapter->tx_ring[0].work_limit;
 
 	/* only valid if in constant ITR mode */
-	switch (adapter->itr_setting) {
+	switch (adapter->rx_itr_setting) {
 	case 0:
 		/* throttling disabled */
 		ec->rx_coalesce_usecs = 0;
@@ -1940,9 +1940,25 @@ static int ixgbe_get_coalesce(struct net_device *netdev,
 		break;
 	default:
 		/* fixed interrupt rate mode */
-		ec->rx_coalesce_usecs = 1000000/adapter->eitr_param;
+		ec->rx_coalesce_usecs = 1000000/adapter->rx_eitr_param;
 		break;
 	}
+
+	/* only valid if in constant ITR mode */
+	switch (adapter->tx_itr_setting) {
+	case 0:
+		/* throttling disabled */
+		ec->tx_coalesce_usecs = 0;
+		break;
+	case 1:
+		/* dynamic ITR mode */
+		ec->tx_coalesce_usecs = 1;
+		break;
+	default:
+		ec->tx_coalesce_usecs = 1000000/adapter->tx_eitr_param;
+		break;
+	}
+
 	return 0;
 }
 
@@ -1953,6 +1969,14 @@ static int ixgbe_set_coalesce(struct net_device *netdev,
 	struct ixgbe_q_vector *q_vector;
 	int i;
 
+	/*
+	 * don't accept tx specific changes if we've got mixed RxTx vectors
+	 * test and jump out here if needed before changing the rx numbers
+	 */
+	if ((1000000/ec->tx_coalesce_usecs) != adapter->tx_eitr_param &&
+	    adapter->q_vector[0]->txr_count && adapter->q_vector[0]->rxr_count)
+		return -EINVAL;
+
 	if (ec->tx_max_coalesced_frames_irq)
 		adapter->tx_ring[0].work_limit = ec->tx_max_coalesced_frames_irq;
 
@@ -1963,26 +1987,49 @@ static int ixgbe_set_coalesce(struct net_device *netdev,
 			return -EINVAL;
 
 		/* store the value in ints/second */
-		adapter->eitr_param = 1000000/ec->rx_coalesce_usecs;
+		adapter->rx_eitr_param = 1000000/ec->rx_coalesce_usecs;
 
 		/* static value of interrupt rate */
-		adapter->itr_setting = adapter->eitr_param;
+		adapter->rx_itr_setting = adapter->rx_eitr_param;
 		/* clear the lower bit as its used for dynamic state */
-		adapter->itr_setting &= ~1;
+		adapter->rx_itr_setting &= ~1;
 	} else if (ec->rx_coalesce_usecs == 1) {
 		/* 1 means dynamic mode */
-		adapter->eitr_param = 20000;
-		adapter->itr_setting = 1;
+		adapter->rx_eitr_param = 20000;
+		adapter->rx_itr_setting = 1;
 	} else {
 		/*
 		 * any other value means disable eitr, which is best
 		 * served by setting the interrupt rate very high
 		 */
 		if (adapter->flags2 & IXGBE_FLAG2_RSC_ENABLED)
-			adapter->eitr_param = IXGBE_MAX_RSC_INT_RATE;
+			adapter->rx_eitr_param = IXGBE_MAX_RSC_INT_RATE;
 		else
-			adapter->eitr_param = IXGBE_MAX_INT_RATE;
-		adapter->itr_setting = 0;
+			adapter->rx_eitr_param = IXGBE_MAX_INT_RATE;
+		adapter->rx_itr_setting = 0;
+	}
+
+	if (ec->tx_coalesce_usecs > 1) {
+		/* check the limits */
+		if ((1000000/ec->tx_coalesce_usecs > IXGBE_MAX_INT_RATE) ||
+		    (1000000/ec->tx_coalesce_usecs < IXGBE_MIN_INT_RATE))
+			return -EINVAL;
+
+		/* store the value in ints/second */
+		adapter->tx_eitr_param = 1000000/ec->tx_coalesce_usecs;
+
+		/* static value of interrupt rate */
+		adapter->tx_itr_setting = adapter->tx_eitr_param;
+
+		/* clear the lower bit as its used for dynamic state */
+		adapter->tx_itr_setting &= ~1;
+	} else if (ec->tx_coalesce_usecs == 1) {
+		/* 1 means dynamic mode */
+		adapter->tx_eitr_param = 10000;
+		adapter->tx_itr_setting = 1;
+	} else {
+		adapter->tx_eitr_param = IXGBE_MAX_INT_RATE;
+		adapter->tx_itr_setting = 0;
 	}
 
 	/* MSI/MSIx Interrupt Mode */
@@ -1992,17 +2039,17 @@ static int ixgbe_set_coalesce(struct net_device *netdev,
 		for (i = 0; i < num_vectors; i++) {
 			q_vector = adapter->q_vector[i];
 			if (q_vector->txr_count && !q_vector->rxr_count)
-				/* tx vector gets half the rate */
-				q_vector->eitr = (adapter->eitr_param >> 1);
+				/* tx only */
+				q_vector->eitr = adapter->tx_eitr_param;
 			else
 				/* rx only or mixed */
-				q_vector->eitr = adapter->eitr_param;
+				q_vector->eitr = adapter->rx_eitr_param;
 			ixgbe_write_eitr(q_vector);
 		}
 	/* Legacy Interrupt Mode */
 	} else {
 		q_vector = adapter->q_vector[0];
-		q_vector->eitr = adapter->eitr_param;
+		q_vector->eitr = adapter->rx_eitr_param;
 		ixgbe_write_eitr(q_vector);
 	}