3 files changed, 30 insertions, 6 deletions

diff --git a/drivers/net/e1000/e1000_ethtool.c b/drivers/net/e1000/e1000_ethtool.c
index d6931cabe421..2a3b2dccd06d 100644
--- a/drivers/net/e1000/e1000_ethtool.c
+++ b/drivers/net/e1000/e1000_ethtool.c
@@ -1808,7 +1808,7 @@ static int e1000_get_coalesce(struct net_device *netdev,
         if (adapter->hw.mac_type < e1000_82545)
                 return -EOPNOTSUPP;
 
-        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;
@@ -1826,12 +1826,14 @@ static int e1000_set_coalesce(struct net_device *netdev,
                 return -EOPNOTSUPP;
 
         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/e1000/e1000_main.c b/drivers/net/e1000/e1000_main.c
index e6ebc222459f..4dd2c23775cb 100644
--- a/drivers/net/e1000/e1000_main.c
+++ b/drivers/net/e1000/e1000_main.c
@@ -31,7 +31,7 @@
 
 char e1000_driver_name[] = "e1000";
 static char e1000_driver_string[] = "Intel(R) PRO/1000 Network Driver";
-#define DRV_VERSION "7.3.21-k5-NAPI"
+#define DRV_VERSION "7.3.21-k6-NAPI"
 const char e1000_driver_version[] = DRV_VERSION;
 static const char e1000_copyright[] = "Copyright (c) 1999-2006 Intel Corporation.";
 
@@ -2386,6 +2386,22 @@ link_up:
                 }
         }
 
+        /* Simple mode for Interrupt Throttle Rate (ITR) */
+        if (hw->mac_type >= e1000_82540 && 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->gotcl + adapter->gorcl) / 10000;
+                u32 dif = (adapter->gotcl > adapter->gorcl ?
+                            adapter->gotcl - adapter->gorcl :
+                            adapter->gorcl - adapter->gotcl) / 10000;
+                u32 itr = goc > 0 ? (dif * 6000 / goc + 2000) : 8000;
+
+                ew32(ITR, 1000000000 / (itr * 256));
+        }
+
         /* Cause software interrupt to ensure rx ring is cleaned */
         ew32(ICS, E1000_ICS_RXDMT0);
 
diff --git a/drivers/net/e1000/e1000_param.c b/drivers/net/e1000/e1000_param.c
index 543c6d1767bc..9fbb562dc964 100644
--- a/drivers/net/e1000/e1000_param.c
+++ b/drivers/net/e1000/e1000_param.c
@@ -484,11 +484,17 @@ void __devinit e1000_check_options(struct e1000_adapter *adapter)
                                 adapter->itr_setting = adapter->itr;
                                 adapter->itr = 20000;
                                 break;
+                        case 4:
+                                e_dev_info("%s set to simplified "
+                                           "(2000-8000) ints mode\n", opt.name);
+                                adapter->itr_setting = adapter->itr;
+                                break;
                         default:
                                 e1000_validate_option(&adapter->itr, &opt,
                                         adapter);
-                                /* save the setting, because the dynamic bits change itr */
-                                /* clear the lower two bits because they are
+                                /* save the setting, because the dynamic bits
+                                 * change itr.
+                                 * clear the lower two bits because they are
                                  * used as control */
                                 adapter->itr_setting = adapter->itr & ~3;
                                 break;