e1000: Fix network problems when forced at 100Mb/s and to fix TSO when forced at 100Mb/s

Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: John Ronciak <john.ronciak@intel.com>

1 files changed, 57 insertions, 10 deletions

diff --git a/drivers/net/e1000/e1000_main.c b/drivers/net/e1000/e1000_main.c
index aad5373a8ae..6ee8ed5606f 100644
--- a/drivers/net/e1000/e1000_main.c
+++ b/drivers/net/e1000/e1000_main.c
@@ -1405,10 +1405,13 @@ e1000_configure_tx(struct e1000_adapter *adapter)
         tctl = E1000_READ_REG(hw, TCTL);
 
         tctl &= ~E1000_TCTL_CT;
-        tctl |= E1000_TCTL_EN | E1000_TCTL_PSP | E1000_TCTL_RTLC |
+        tctl |= E1000_TCTL_PSP | E1000_TCTL_RTLC |
                 (E1000_COLLISION_THRESHOLD << E1000_CT_SHIFT);
 
-        E1000_WRITE_REG(hw, TCTL, tctl);
+#ifdef DISABLE_MULR
+        /* disable Multiple Reads for debugging */
+        tctl &= ~E1000_TCTL_MULR;
+#endif
 
         if (hw->mac_type == e1000_82571 || hw->mac_type == e1000_82572) {
                 tarc = E1000_READ_REG(hw, TARC0);
@@ -1439,6 +1442,9 @@ e1000_configure_tx(struct e1000_adapter *adapter)
         if (hw->mac_type == e1000_82544 &&
             hw->bus_type == e1000_bus_type_pcix)
                 adapter->pcix_82544 = 1;
+
+        E1000_WRITE_REG(hw, TCTL, tctl);
+
 }
 
 /**
@@ -2243,7 +2249,7 @@ e1000_watchdog_task(struct e1000_adapter *adapter)
 {
         struct net_device *netdev = adapter->netdev;
         struct e1000_tx_ring *txdr = adapter->tx_ring;
-        uint32_t link;
+        uint32_t link, tctl;
 
         e1000_check_for_link(&adapter->hw);
         if (adapter->hw.mac_type == e1000_82573) {
@@ -2269,20 +2275,61 @@ e1000_watchdog_task(struct e1000_adapter *adapter)
                                adapter->link_duplex == FULL_DUPLEX ?
                                "Full Duplex" : "Half Duplex");
 
-                        /* tweak tx_queue_len according to speed/duplex */
+                        /* tweak tx_queue_len according to speed/duplex
+                         * and adjust the timeout factor */
                         netdev->tx_queue_len = adapter->tx_queue_len;
                         adapter->tx_timeout_factor = 1;
-                        if (adapter->link_duplex == HALF_DUPLEX) {
+                        adapter->txb2b = 1;
+                        switch (adapter->link_speed) {
+                        case SPEED_10:
+                                adapter->txb2b = 0;
+                                netdev->tx_queue_len = 10;
+                                adapter->tx_timeout_factor = 8;
+                                break;
+                        case SPEED_100:
+                                adapter->txb2b = 0;
+                                netdev->tx_queue_len = 100;
+                                /* maybe add some timeout factor ? */
+                                break;
+                        }
+
+                        if ((adapter->hw.mac_type == e1000_82571 || 
+                             adapter->hw.mac_type == e1000_82572) &&
+                            adapter->txb2b == 0) {
+#define SPEED_MODE_BIT (1 << 21)
+                                uint32_t tarc0;
+                                tarc0 = E1000_READ_REG(&adapter->hw, TARC0);
+                                tarc0 &= ~SPEED_MODE_BIT;
+                                E1000_WRITE_REG(&adapter->hw, TARC0, tarc0);
+                        }
+                                
+#ifdef NETIF_F_TSO
+                        /* disable TSO for pcie and 10/100 speeds, to avoid
+                         * some hardware issues */
+                        if (!adapter->tso_force &&
+                            adapter->hw.bus_type == e1000_bus_type_pci_express){
                                 switch (adapter->link_speed) {
                                 case SPEED_10:
-                                        netdev->tx_queue_len = 10;
-                                        adapter->tx_timeout_factor = 8;
-                                        break;
                                 case SPEED_100:
-                                        netdev->tx_queue_len = 100;
+                                        DPRINTK(PROBE,INFO,
+                                        "10/100 speed: disabling TSO\n");
+                                        netdev->features &= ~NETIF_F_TSO;
+                                        break;
+                                case SPEED_1000:
+                                        netdev->features |= NETIF_F_TSO;
+                                        break;
+                                default:
+                                        /* oops */
                                         break;
                                 }
                         }
+#endif
+
+                        /* enable transmits in the hardware, need to do this
+                         * after setting TARC0 */
+                        tctl = E1000_READ_REG(&adapter->hw, TCTL);
+                        tctl |= E1000_TCTL_EN;
+                        E1000_WRITE_REG(&adapter->hw, TCTL, tctl);
 
                         netif_carrier_on(netdev);
                         netif_wake_queue(netdev);
@@ -3319,7 +3366,7 @@ e1000_clean_tx_irq(struct e1000_adapter *adapter,
                 adapter->detect_tx_hung = FALSE;
                 if (tx_ring->buffer_info[eop].dma &&
                     time_after(jiffies, tx_ring->buffer_info[eop].time_stamp +
-                               adapter->tx_timeout_factor * HZ)
+                               (adapter->tx_timeout_factor * HZ))
                     && !(E1000_READ_REG(&adapter->hw, STATUS) &
                          E1000_STATUS_TXOFF)) {