3 files changed, 27 insertions, 4 deletions

diff --git a/drivers/net/e1000e/ethtool.c b/drivers/net/e1000e/ethtool.c
index b72c1c0876fc..6ff376cfe139 100644
--- a/drivers/net/e1000e/ethtool.c
+++ b/drivers/net/e1000e/ethtool.c
@@ -1890,7 +1890,7 @@ static int e1000_get_coalesce(struct net_device *netdev,
 {
         struct e1000_adapter *adapter = netdev_priv(netdev);
 
-        if (adapter->itr_setting <= 3)
+        if (adapter->itr_setting <= 4)
                 ec->rx_coalesce_usecs = adapter->itr_setting;
         else
                 ec->rx_coalesce_usecs = 1000000 / adapter->itr_setting;
@@ -1905,12 +1905,14 @@ static int e1000_set_coalesce(struct net_device *netdev,
         struct e1000_hw *hw = &adapter->hw;
 
         if ((ec->rx_coalesce_usecs > E1000_MAX_ITR_USECS) ||
-            ((ec->rx_coalesce_usecs > 3) &&
+            ((ec->rx_coalesce_usecs > 4) &&
              (ec->rx_coalesce_usecs < E1000_MIN_ITR_USECS)) ||
             (ec->rx_coalesce_usecs == 2))
                 return -EINVAL;
 
-        if (ec->rx_coalesce_usecs <= 3) {
+        if (ec->rx_coalesce_usecs == 4) {
+                adapter->itr = adapter->itr_setting = 4;
+        } else if (ec->rx_coalesce_usecs <= 3) {
                 adapter->itr = 20000;
                 adapter->itr_setting = ec->rx_coalesce_usecs;
         } else {
diff --git a/drivers/net/e1000e/netdev.c b/drivers/net/e1000e/netdev.c
index 478c34a47d18..c5f65a29865a 100644
--- a/drivers/net/e1000e/netdev.c
+++ b/drivers/net/e1000e/netdev.c
@@ -52,7 +52,7 @@
 
 #include "e1000.h"
 
-#define DRV_VERSION "1.0.2-k2"
+#define DRV_VERSION "1.0.2-k4"
 char e1000e_driver_name[] = "e1000e";
 const char e1000e_driver_version[] = DRV_VERSION;
 
@@ -4070,6 +4070,22 @@ link_up:
                 }
         }
 
+        /* Simple mode for Interrupt Throttle Rate (ITR) */
+        if (adapter->itr_setting == 4) {
+                /*
+                 * Symmetric Tx/Rx gets a reduced ITR=2000;
+                 * Total asymmetrical Tx or Rx gets ITR=8000;
+                 * everyone else is between 2000-8000.
+                 */
+                u32 goc = (adapter->gotc + adapter->gorc) / 10000;
+                u32 dif = (adapter->gotc > adapter->gorc ?
+                            adapter->gotc - adapter->gorc :
+                            adapter->gorc - adapter->gotc) / 10000;
+                u32 itr = goc > 0 ? (dif * 6000 / goc + 2000) : 8000;
+
+                ew32(ITR, 1000000000 / (itr * 256));
+        }
+
         /* Cause software interrupt to ensure Rx ring is cleaned */
         if (adapter->msix_entries)
                 ew32(ICS, adapter->rx_ring->ims_val);
diff --git a/drivers/net/e1000e/param.c b/drivers/net/e1000e/param.c
index f775a481063d..0f4077c3d538 100644
--- a/drivers/net/e1000e/param.c
+++ b/drivers/net/e1000e/param.c
@@ -351,6 +351,11 @@ void __devinit e1000e_check_options(struct e1000_adapter *adapter)
                                 adapter->itr_setting = adapter->itr;
                                 adapter->itr = 20000;
                                 break;
+                        case 4:
+                                e_info("%s set to simplified (2000-8000 ints) "
+                                       "mode\n", opt.name);
+                                adapter->itr_setting = 4;
+                                break;
                         default:
                                 /*
                                  * Save the setting, because the dynamic bits