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Date: Sat, 3 Dec 2011 03:44:26 -0800 From: Jeff Kirsher <jeffrey.t.kirsher@...el.com> To: davem@...emloft.net Cc: Michael Wang <wangyun@...ux.vnet.ibm.com>, netdev@...r.kernel.org, gospo@...hat.com, sassmann@...hat.com, Flavio Leitner <fbl@...hat.com>, Jeff Kirsher <jeffrey.t.kirsher@...el.com> Subject: [net-next 1/6] e1000e: Avoid wrong check on TX hang From: Michael Wang <wangyun@...ux.vnet.ibm.com> Descriptors may not be write-back while checking TX hang with flag FLAG2_DMA_BURST on. So when we detect hang, we just flush the descriptor and detect again for once. Signed-off-by: Michael Wang <wangyun@...ux.vnet.ibm.com> Signed-off-by: Flavio Leitner <fbl@...hat.com> Acked-by: Jesse Brandeburg <jesse.brandeburg@...el.com> Tested-by: Aaron Brown <aaron.f.brown@...el.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com> --- drivers/net/ethernet/intel/e1000e/e1000.h | 1 + drivers/net/ethernet/intel/e1000e/netdev.c | 23 ++++++++++++++++++++--- 2 files changed, 21 insertions(+), 3 deletions(-) diff --git a/drivers/net/ethernet/intel/e1000e/e1000.h b/drivers/net/ethernet/intel/e1000e/e1000.h index 9fe18d1..f478a22 100644 --- a/drivers/net/ethernet/intel/e1000e/e1000.h +++ b/drivers/net/ethernet/intel/e1000e/e1000.h @@ -309,6 +309,7 @@ struct e1000_adapter { u32 txd_cmd; bool detect_tx_hung; + bool tx_hang_recheck; u8 tx_timeout_factor; u32 tx_int_delay; diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c index c6e9763..3c12e6a 100644 --- a/drivers/net/ethernet/intel/e1000e/netdev.c +++ b/drivers/net/ethernet/intel/e1000e/netdev.c @@ -1014,6 +1014,7 @@ static void e1000_print_hw_hang(struct work_struct *work) struct e1000_adapter *adapter = container_of(work, struct e1000_adapter, print_hang_task); + struct net_device *netdev = adapter->netdev; struct e1000_ring *tx_ring = adapter->tx_ring; unsigned int i = tx_ring->next_to_clean; unsigned int eop = tx_ring->buffer_info[i].next_to_watch; @@ -1025,6 +1026,21 @@ static void e1000_print_hw_hang(struct work_struct *work) if (test_bit(__E1000_DOWN, &adapter->state)) return; + if ((!adapter->tx_hang_recheck) && + (adapter->flags2 & FLAG2_DMA_BURST)) { + /* May be block on write-back, flush and detect again + * flush pending descriptor writebacks to memory + */ + ew32(TIDV, adapter->tx_int_delay | E1000_TIDV_FPD); + /* execute the writes immediately */ + e1e_flush(); + adapter->tx_hang_recheck = 1; + return; + } + /* Real hang detected */ + adapter->tx_hang_recheck = 0; + netif_stop_queue(netdev); + e1e_rphy(hw, PHY_STATUS, &phy_status); e1e_rphy(hw, PHY_1000T_STATUS, &phy_1000t_status); e1e_rphy(hw, PHY_EXT_STATUS, &phy_ext_status); @@ -1145,10 +1161,10 @@ static bool e1000_clean_tx_irq(struct e1000_adapter *adapter) if (tx_ring->buffer_info[i].time_stamp && time_after(jiffies, tx_ring->buffer_info[i].time_stamp + (adapter->tx_timeout_factor * HZ)) && - !(er32(STATUS) & E1000_STATUS_TXOFF)) { + !(er32(STATUS) & E1000_STATUS_TXOFF)) schedule_work(&adapter->print_hang_task); - netif_stop_queue(netdev); - } + else + adapter->tx_hang_recheck = 0; } adapter->total_tx_bytes += total_tx_bytes; adapter->total_tx_packets += total_tx_packets; @@ -3838,6 +3854,7 @@ static int e1000_open(struct net_device *netdev) e1000_irq_enable(adapter); + adapter->tx_hang_recheck = 0; netif_start_queue(netdev); adapter->idle_check = true; -- 1.7.6.4 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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