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igb: do not modify tx_queue_len on link speed change

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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.

Based on e1000e patch by 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>
This commit is contained in:
Emil Tantilov 2010-03-23 18:34:57 +00:00 committed by David S. Miller
parent fa3d9a6d55
commit d07f3e375f
2 changed files with 1 additions and 10 deletions
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1
drivers/net/igb/igb.h
View file

@ -267,7 +267,6 @@ struct igb_adapter {
/* TX */
struct igb_ring *tx_ring[16];
unsigned long tx_queue_len;
u32 tx_timeout_count;
/* RX */

10
drivers/net/igb/igb_main.c
View file

@ -1105,9 +1105,6 @@ static void igb_configure(struct igb_adapter *adapter)
struct igb_ring *ring = adapter->rx_ring[i];
igb_alloc_rx_buffers_adv(ring, igb_desc_unused(ring));
}
adapter->tx_queue_len = netdev->tx_queue_len;
}
/**
@ -1213,7 +1210,6 @@ void igb_down(struct igb_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);
/* record the stats before reset*/
@ -3106,17 +3102,13 @@ static void igb_watchdog_task(struct work_struct *work)
((ctrl & E1000_CTRL_RFCE) ? "RX" :
((ctrl & E1000_CTRL_TFCE) ? "TX" : "None")));
/* 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:
netdev->tx_queue_len = 10;
adapter->tx_timeout_factor = 14;
break;
case SPEED_100:
netdev->tx_queue_len = 100;
/* maybe add some timeout factor ? */
break;
}