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ixgbe: avoid HW lockup when adapter is reset with Tx work pending

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This change is meant to avoid a hardware lockup when Tx work is still
pending and we request a reset.

Signed-off-by: Emil Tantilov <emil.s.tantilov@intel.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Emil Tantilov
2011-08-16 04:35:11 +00:00
committed by Jeff Kirsher
parent e886c44f7b
commit ff9d1a5aef
6 changed files with 107 additions and 88 deletions
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151
drivers/net/ethernet/intel/ixgbe/ixgbe_common.c
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@@ -61,6 +61,7 @@ static s32 ixgbe_write_eeprom_buffer_bit_bang(struct ixgbe_hw *hw, u16 offset,
u16 words, u16 *data);
static s32 ixgbe_detect_eeprom_page_size_generic(struct ixgbe_hw *hw,
u16 offset);
static s32 ixgbe_disable_pcie_master(struct ixgbe_hw *hw);
/**
* ixgbe_start_hw_generic - Prepare hardware for Tx/Rx
@@ -496,7 +497,6 @@ void ixgbe_set_lan_id_multi_port_pcie(struct ixgbe_hw *hw)
**/
s32 ixgbe_stop_adapter_generic(struct ixgbe_hw *hw)
{
u32 number_of_queues;
u32 reg_val;
u16 i;
@@ -507,35 +507,35 @@ s32 ixgbe_stop_adapter_generic(struct ixgbe_hw *hw)
hw->adapter_stopped = true;
/* Disable the receive unit */
reg_val = IXGBE_READ_REG(hw, IXGBE_RXCTRL);
reg_val &= ~(IXGBE_RXCTRL_RXEN);
IXGBE_WRITE_REG(hw, IXGBE_RXCTRL, reg_val);
IXGBE_WRITE_FLUSH(hw);
usleep_range(2000, 4000);
IXGBE_WRITE_REG(hw, IXGBE_RXCTRL, 0);
/* Clear interrupt mask to stop from interrupts being generated */
/* Clear interrupt mask to stop interrupts from being generated */
IXGBE_WRITE_REG(hw, IXGBE_EIMC, IXGBE_IRQ_CLEAR_MASK);
/* Clear any pending interrupts */
/* Clear any pending interrupts, flush previous writes */
IXGBE_READ_REG(hw, IXGBE_EICR);
/* Disable the transmit unit. Each queue must be disabled. */
number_of_queues = hw->mac.max_tx_queues;
for (i = 0; i < number_of_queues; i++) {
reg_val = IXGBE_READ_REG(hw, IXGBE_TXDCTL(i));
if (reg_val & IXGBE_TXDCTL_ENABLE) {
reg_val &= ~IXGBE_TXDCTL_ENABLE;
IXGBE_WRITE_REG(hw, IXGBE_TXDCTL(i), reg_val);
}
for (i = 0; i < hw->mac.max_tx_queues; i++)
IXGBE_WRITE_REG(hw, IXGBE_TXDCTL(i), IXGBE_TXDCTL_SWFLSH);
/* Disable the receive unit by stopping each queue */
for (i = 0; i < hw->mac.max_rx_queues; i++) {
reg_val = IXGBE_READ_REG(hw, IXGBE_RXDCTL(i));
reg_val &= ~IXGBE_RXDCTL_ENABLE;
reg_val |= IXGBE_RXDCTL_SWFLSH;
IXGBE_WRITE_REG(hw, IXGBE_RXDCTL(i), reg_val);
}
/* flush all queues disables */
IXGBE_WRITE_FLUSH(hw);
usleep_range(1000, 2000);
/*
* Prevent the PCI-E bus from from hanging by disabling PCI-E master
* access and verify no pending requests
*/
ixgbe_disable_pcie_master(hw);
return 0;
return ixgbe_disable_pcie_master(hw);
}
/**
@@ -2458,75 +2458,57 @@ out:
* bit hasn't caused the master requests to be disabled, else 0
* is returned signifying master requests disabled.
**/
s32 ixgbe_disable_pcie_master(struct ixgbe_hw *hw)
static s32 ixgbe_disable_pcie_master(struct ixgbe_hw *hw)
{
struct ixgbe_adapter *adapter = hw->back;
u32 i;
u32 reg_val;
u32 number_of_queues;
s32 status = 0;
u16 dev_status = 0;
u32 i;
u16 value;
/* Just jump out if bus mastering is already disabled */
/* Always set this bit to ensure any future transactions are blocked */
IXGBE_WRITE_REG(hw, IXGBE_CTRL, IXGBE_CTRL_GIO_DIS);
/* Exit if master requests are blocked */
if (!(IXGBE_READ_REG(hw, IXGBE_STATUS) & IXGBE_STATUS_GIO))
goto out;
/* Disable the receive unit by stopping each queue */
number_of_queues = hw->mac.max_rx_queues;
for (i = 0; i < number_of_queues; i++) {
reg_val = IXGBE_READ_REG(hw, IXGBE_RXDCTL(i));
if (reg_val & IXGBE_RXDCTL_ENABLE) {
reg_val &= ~IXGBE_RXDCTL_ENABLE;
IXGBE_WRITE_REG(hw, IXGBE_RXDCTL(i), reg_val);
}
}
reg_val = IXGBE_READ_REG(hw, IXGBE_CTRL);
reg_val |= IXGBE_CTRL_GIO_DIS;
IXGBE_WRITE_REG(hw, IXGBE_CTRL, reg_val);
/* Poll for master request bit to clear */
for (i = 0; i < IXGBE_PCI_MASTER_DISABLE_TIMEOUT; i++) {
udelay(100);
if (!(IXGBE_READ_REG(hw, IXGBE_STATUS) & IXGBE_STATUS_GIO))
goto check_device_status;
udelay(100);
goto out;
}
hw_dbg(hw, "GIO Master Disable bit didn't clear - requesting resets\n");
status = IXGBE_ERR_MASTER_REQUESTS_PENDING;
/*
* Before proceeding, make sure that the PCIe block does not have
* transactions pending.
*/
check_device_status:
for (i = 0; i < IXGBE_PCI_MASTER_DISABLE_TIMEOUT; i++) {
pci_read_config_word(adapter->pdev, IXGBE_PCI_DEVICE_STATUS,
&dev_status);
if (!(dev_status & IXGBE_PCI_DEVICE_STATUS_TRANSACTION_PENDING))
break;
udelay(100);
}
if (i == IXGBE_PCI_MASTER_DISABLE_TIMEOUT)
hw_dbg(hw, "PCIe transaction pending bit also did not clear.\n");
else
goto out;
/*
* Two consecutive resets are required via CTRL.RST per datasheet
* 5.2.5.3.2 Master Disable. We set a flag to inform the reset routine
* of this need. The first reset prevents new master requests from
* being issued by our device. We then must wait 1usec for any
* being issued by our device. We then must wait 1usec or more for any
* remaining completions from the PCIe bus to trickle in, and then reset
* again to clear out any effects they may have had on our device.
*/
hw->mac.flags |= IXGBE_FLAGS_DOUBLE_RESET_REQUIRED;
hw_dbg(hw, "GIO Master Disable bit didn't clear - requesting resets\n");
hw->mac.flags |= IXGBE_FLAGS_DOUBLE_RESET_REQUIRED;
/*
* Before proceeding, make sure that the PCIe block does not have
* transactions pending.
*/
for (i = 0; i < IXGBE_PCI_MASTER_DISABLE_TIMEOUT; i++) {
udelay(100);
pci_read_config_word(adapter->pdev, IXGBE_PCI_DEVICE_STATUS,
&value);
if (!(value & IXGBE_PCI_DEVICE_STATUS_TRANSACTION_PENDING))
goto out;
}
hw_dbg(hw, "PCIe transaction pending bit also did not clear.\n");
status = IXGBE_ERR_MASTER_REQUESTS_PENDING;
out:
return status;
}
/**
* ixgbe_acquire_swfw_sync - Acquire SWFW semaphore
* @hw: pointer to hardware structure
@@ -3509,3 +3491,44 @@ s32 ixgbe_set_fw_drv_ver_generic(struct ixgbe_hw *hw, u8 maj, u8 min,
out:
return ret_val;
}
/**
* ixgbe_clear_tx_pending - Clear pending TX work from the PCIe fifo
* @hw: pointer to the hardware structure
*
* The 82599 and x540 MACs can experience issues if TX work is still pending
* when a reset occurs. This function prevents this by flushing the PCIe
* buffers on the system.
**/
void ixgbe_clear_tx_pending(struct ixgbe_hw *hw)
{
u32 gcr_ext, hlreg0;
/*
* If double reset is not requested then all transactions should
* already be clear and as such there is no work to do
*/
if (!(hw->mac.flags & IXGBE_FLAGS_DOUBLE_RESET_REQUIRED))
return;
/*
* Set loopback enable to prevent any transmits from being sent
* should the link come up. This assumes that the RXCTRL.RXEN bit
* has already been cleared.
*/
hlreg0 = IXGBE_READ_REG(hw, IXGBE_HLREG0);
IXGBE_WRITE_REG(hw, IXGBE_HLREG0, hlreg0 | IXGBE_HLREG0_LPBK);
/* initiate cleaning flow for buffers in the PCIe transaction layer */
gcr_ext = IXGBE_READ_REG(hw, IXGBE_GCR_EXT);
IXGBE_WRITE_REG(hw, IXGBE_GCR_EXT,
gcr_ext | IXGBE_GCR_EXT_BUFFERS_CLEAR);
/* Flush all writes and allow 20usec for all transactions to clear */
IXGBE_WRITE_FLUSH(hw);
udelay(20);
/* restore previous register values */
IXGBE_WRITE_REG(hw, IXGBE_GCR_EXT, gcr_ext);
IXGBE_WRITE_REG(hw, IXGBE_HLREG0, hlreg0);
}