e1000e: do not modify tx_queue_len on link speed change
Emil Tantilov [Wed, 24 Mar 2010 12:55:02 +0000 (12:55 +0000)]
Previously the driver tweaked txqueuelen to avoid false Tx hang reports seen at half duplex.
This had the effect of overriding user set values on link change/reset. Testing shows that
adjusting only the timeout factor is sufficient to prevent Tx hang reports at half duplex.

This patch removes all instances of tx_queue_len in the driver.

Originally reported and patched by Franco Fichtner
CC: Franco Fichtner <franco@lastsummer.de>
Signed-off-by: Emil Tantilov <emil.s.tantilov@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/e1000e/e1000.h
drivers/net/e1000e/netdev.c

index c2ec095..118bdf4 100644 (file)
@@ -279,7 +279,6 @@ struct e1000_adapter {
 
        struct napi_struct napi;
 
-       unsigned long tx_queue_len;
        unsigned int restart_queue;
        u32 txd_cmd;
 
index 88d54d3..e1cceb6 100644 (file)
@@ -2289,8 +2289,6 @@ static void e1000_configure_tx(struct e1000_adapter *adapter)
        ew32(TCTL, tctl);
 
        e1000e_config_collision_dist(hw);
-
-       adapter->tx_queue_len = adapter->netdev->tx_queue_len;
 }
 
 /**
@@ -2877,7 +2875,6 @@ void e1000e_down(struct e1000_adapter *adapter)
        del_timer_sync(&adapter->watchdog_timer);
        del_timer_sync(&adapter->phy_info_timer);
 
-       netdev->tx_queue_len = adapter->tx_queue_len;
        netif_carrier_off(netdev);
        adapter->link_speed = 0;
        adapter->link_duplex = 0;
@@ -3588,21 +3585,15 @@ static void e1000_watchdog_task(struct work_struct *work)
                                               "link gets many collisions.\n");
                        }
 
-                       /*
-                        * tweak tx_queue_len according to speed/duplex
-                        * and adjust the timeout factor
-                        */
-                       netdev->tx_queue_len = adapter->tx_queue_len;
+                       /* adjust timeout factor according to speed/duplex */
                        adapter->tx_timeout_factor = 1;
                        switch (adapter->link_speed) {
                        case SPEED_10:
                                txb2b = 0;
-                               netdev->tx_queue_len = 10;
                                adapter->tx_timeout_factor = 16;
                                break;
                        case SPEED_100:
                                txb2b = 0;
-                               netdev->tx_queue_len = 100;
                                adapter->tx_timeout_factor = 10;
                                break;
                        }