igb: remove adaptive IFS from driver

Adaptive IFS support has been included in the igb driver since its
initial release, but it is not a feature on any igb NICs. This patch
removes it from the driver.

Signed-off-by: Nicholas Nunley <nicholasx.d.nunley@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

5 files changed, 2 insertions, 93 deletions

diff --git a/drivers/net/igb/e1000_defines.h b/drivers/net/igb/e1000_defines.h
index c01715070764..fe6cf1b696c7 100644
--- a/drivers/net/igb/e1000_defines.h
+++ b/drivers/net/igb/e1000_defines.h
@@ -313,12 +313,6 @@
 #define E1000_PBA_34K 0x0022
 #define E1000_PBA_64K 0x0040    /* 64KB */
 
-#define IFS_MAX       80
-#define IFS_MIN       40
-#define IFS_RATIO     4
-#define IFS_STEP      10
-#define MIN_NUM_XMITS 1000
-
 /* SW Semaphore Register */
 #define E1000_SWSM_SMBI         0x00000001 /* Driver Semaphore bit */
 #define E1000_SWSM_SWESMBI      0x00000002 /* FW Semaphore bit */
diff --git a/drivers/net/igb/e1000_hw.h b/drivers/net/igb/e1000_hw.h
index dbaeb5f5e0c7..448005276b26 100644
--- a/drivers/net/igb/e1000_hw.h
+++ b/drivers/net/igb/e1000_hw.h
@@ -339,19 +339,12 @@ struct e1000_mac_info {
 
         enum e1000_mac_type type;
 
-        u32 collision_delta;
         u32 ledctl_default;
         u32 ledctl_mode1;
         u32 ledctl_mode2;
         u32 mc_filter_type;
-        u32 tx_packet_delta;
         u32 txcw;
 
-        u16 current_ifs_val;
-        u16 ifs_max_val;
-        u16 ifs_min_val;
-        u16 ifs_ratio;
-        u16 ifs_step_size;
         u16 mta_reg_count;
         u16 uta_reg_count;
 
diff --git a/drivers/net/igb/e1000_mac.c b/drivers/net/igb/e1000_mac.c
index 2ad358a240bf..2a8a886b37eb 100644
--- a/drivers/net/igb/e1000_mac.c
+++ b/drivers/net/igb/e1000_mac.c
@@ -1304,76 +1304,6 @@ out:
 }
 
 /**
- *  igb_reset_adaptive - Reset Adaptive Interframe Spacing
- *  @hw: pointer to the HW structure
- *
- *  Reset the Adaptive Interframe Spacing throttle to default values.
- **/
-void igb_reset_adaptive(struct e1000_hw *hw)
-{
-        struct e1000_mac_info *mac = &hw->mac;
-
-        if (!mac->adaptive_ifs) {
-                hw_dbg("Not in Adaptive IFS mode!\n");
-                goto out;
-        }
-
-        if (!mac->ifs_params_forced) {
-                mac->current_ifs_val = 0;
-                mac->ifs_min_val = IFS_MIN;
-                mac->ifs_max_val = IFS_MAX;
-                mac->ifs_step_size = IFS_STEP;
-                mac->ifs_ratio = IFS_RATIO;
-        }
-
-        mac->in_ifs_mode = false;
-        wr32(E1000_AIT, 0);
-out:
-        return;
-}
-
-/**
- *  igb_update_adaptive - Update Adaptive Interframe Spacing
- *  @hw: pointer to the HW structure
- *
- *  Update the Adaptive Interframe Spacing Throttle value based on the
- *  time between transmitted packets and time between collisions.
- **/
-void igb_update_adaptive(struct e1000_hw *hw)
-{
-        struct e1000_mac_info *mac = &hw->mac;
-
-        if (!mac->adaptive_ifs) {
-                hw_dbg("Not in Adaptive IFS mode!\n");
-                goto out;
-        }
-
-        if ((mac->collision_delta * mac->ifs_ratio) > mac->tx_packet_delta) {
-                if (mac->tx_packet_delta > MIN_NUM_XMITS) {
-                        mac->in_ifs_mode = true;
-                        if (mac->current_ifs_val < mac->ifs_max_val) {
-                                if (!mac->current_ifs_val)
-                                        mac->current_ifs_val = mac->ifs_min_val;
-                                else
-                                        mac->current_ifs_val +=
-                                                mac->ifs_step_size;
-                                wr32(E1000_AIT,
-                                                mac->current_ifs_val);
-                        }
-                }
-        } else {
-                if (mac->in_ifs_mode &&
-                    (mac->tx_packet_delta <= MIN_NUM_XMITS)) {
-                        mac->current_ifs_val = 0;
-                        mac->in_ifs_mode = false;
-                        wr32(E1000_AIT, 0);
-                }
-        }
-out:
-        return;
-}
-
-/**
  *  igb_validate_mdi_setting - Verify MDI/MDIx settings
  *  @hw: pointer to the HW structure
  *
diff --git a/drivers/net/igb/e1000_mac.h b/drivers/net/igb/e1000_mac.h
index bca17d882417..601be99711c2 100644
--- a/drivers/net/igb/e1000_mac.h
+++ b/drivers/net/igb/e1000_mac.h
@@ -67,8 +67,6 @@ void igb_mta_set(struct e1000_hw *hw, u32 hash_value);
 void igb_put_hw_semaphore(struct e1000_hw *hw);
 void igb_rar_set(struct e1000_hw *hw, u8 *addr, u32 index);
 s32  igb_check_alt_mac_addr(struct e1000_hw *hw);
-void igb_reset_adaptive(struct e1000_hw *hw);
-void igb_update_adaptive(struct e1000_hw *hw);
 
 bool igb_enable_mng_pass_thru(struct e1000_hw *hw);
 
diff --git a/drivers/net/igb/igb_main.c b/drivers/net/igb/igb_main.c
index 30fb5a89c42d..eb48e1a084dd 100644
--- a/drivers/net/igb/igb_main.c
+++ b/drivers/net/igb/igb_main.c
@@ -1365,7 +1365,6 @@ void igb_reset(struct igb_adapter *adapter)
         /* Enable h/w to recognize an 802.1Q VLAN Ethernet packet */
         wr32(E1000_VET, ETHERNET_IEEE_VLAN_TYPE);
 
-        igb_reset_adaptive(hw);
         igb_get_phy_info(hw);
 }
 
@@ -1508,7 +1507,6 @@ static int __devinit igb_probe(struct pci_dev *pdev,
         igb_get_bus_info_pcie(hw);
 
         hw->phy.autoneg_wait_to_complete = false;
-        hw->mac.adaptive_ifs = true;
 
         /* Copper options */
         if (hw->phy.media_type == e1000_media_type_copper) {
@@ -3159,7 +3157,6 @@ static void igb_watchdog_task(struct work_struct *work)
         }
 
         igb_update_stats(adapter);
-        igb_update_adaptive(hw);
 
         for (i = 0; i < adapter->num_tx_queues; i++) {
                 struct igb_ring *tx_ring = adapter->tx_ring[i];
@@ -4064,11 +4061,8 @@ void igb_update_stats(struct igb_adapter *adapter)
         adapter->stats.mptc += rd32(E1000_MPTC);
         adapter->stats.bptc += rd32(E1000_BPTC);
 
-        /* used for adaptive IFS */
-        hw->mac.tx_packet_delta = rd32(E1000_TPT);
-        adapter->stats.tpt += hw->mac.tx_packet_delta;
-        hw->mac.collision_delta = rd32(E1000_COLC);
-        adapter->stats.colc += hw->mac.collision_delta;
+        adapter->stats.tpt += rd32(E1000_TPT);
+        adapter->stats.colc += rd32(E1000_COLC);
 
         adapter->stats.algnerrc += rd32(E1000_ALGNERRC);
         adapter->stats.rxerrc += rd32(E1000_RXERRC);