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ixgb: Add PCI Error recovery callbacks

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Adds PCI Error recovery callbacks to the Intel 10-gigabit ethernet ixgb
device driver.  Lightly tested, works.

"Zhang, Yanmin" <yanmin_zhang@linux.intel.com> wrote:

Both pci_disable_device and ixgb_down would access the device.  It doesn't
follow Documentation/pci-error-recovery.txt that error_detected shouldn't do
any access to the device.

Signed-off-by: Linas Vepstas <linas@austin.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Auke Kok <auke-jan.h.kok@intel.com>
This commit is contained in:
Linas Vepstas 2006-08-31 14:27:52 -07:00 committed by Auke Kok
parent adc5413965
commit 01748fbb41
1 changed files with 111 additions and 1 deletions
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112
drivers/net/ixgb/ixgb_main.c
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@ -118,15 +118,26 @@ static void ixgb_restore_vlan(struct ixgb_adapter *adapter);
static void ixgb_netpoll(struct net_device *dev);
#endif
/* Exported from other modules */
static pci_ers_result_t ixgb_io_error_detected (struct pci_dev *pdev,
enum pci_channel_state state);
static pci_ers_result_t ixgb_io_slot_reset (struct pci_dev *pdev);
static void ixgb_io_resume (struct pci_dev *pdev);
/* Exported from other modules */
extern void ixgb_check_options(struct ixgb_adapter *adapter);
static struct pci_error_handlers ixgb_err_handler = {
.error_detected = ixgb_io_error_detected,
.slot_reset = ixgb_io_slot_reset,
.resume = ixgb_io_resume,
};
static struct pci_driver ixgb_driver = {
.name = ixgb_driver_name,
.id_table = ixgb_pci_tbl,
.probe = ixgb_probe,
.remove = __devexit_p(ixgb_remove),
.err_handler = &ixgb_err_handler
};
MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
@ -1550,6 +1561,11 @@ void
ixgb_update_stats(struct ixgb_adapter *adapter)
{
struct net_device *netdev = adapter->netdev;
struct pci_dev *pdev = adapter->pdev;
/* Prevent stats update while adapter is being reset */
if (pdev->error_state && pdev->error_state != pci_channel_io_normal)
return;
if((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
(netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
@ -2205,4 +2221,98 @@ static void ixgb_netpoll(struct net_device *dev)
}
#endif
/**
* ixgb_io_error_detected() - called when PCI error is detected
* @pdev pointer to pci device with error
* @state pci channel state after error
*
* This callback is called by the PCI subsystem whenever
* a PCI bus error is detected.
*/
static pci_ers_result_t ixgb_io_error_detected (struct pci_dev *pdev,
enum pci_channel_state state)
{
struct net_device *netdev = pci_get_drvdata(pdev);
struct ixgb_adapter *adapter = netdev->priv;
if(netif_running(netdev))
ixgb_down(adapter, TRUE);
pci_disable_device(pdev);
/* Request a slot reset. */
return PCI_ERS_RESULT_NEED_RESET;
}
/**
* ixgb_io_slot_reset - called after the pci bus has been reset.
* @pdev pointer to pci device with error
*
* This callback is called after the PCI buss has been reset.
* Basically, this tries to restart the card from scratch.
* This is a shortened version of the device probe/discovery code,
* it resembles the first-half of the ixgb_probe() routine.
*/
static pci_ers_result_t ixgb_io_slot_reset (struct pci_dev *pdev)
{
struct net_device *netdev = pci_get_drvdata(pdev);
struct ixgb_adapter *adapter = netdev->priv;
if(pci_enable_device(pdev)) {
DPRINTK(PROBE, ERR, "Cannot re-enable PCI device after reset.\n");
return PCI_ERS_RESULT_DISCONNECT;
}
/* Perform card reset only on one instance of the card */
if (0 != PCI_FUNC (pdev->devfn))
return PCI_ERS_RESULT_RECOVERED;
pci_set_master(pdev);
netif_carrier_off(netdev);
netif_stop_queue(netdev);
ixgb_reset(adapter);
/* Make sure the EEPROM is good */
if(!ixgb_validate_eeprom_checksum(&adapter->hw)) {
DPRINTK(PROBE, ERR, "After reset, the EEPROM checksum is not valid.\n");
return PCI_ERS_RESULT_DISCONNECT;
}
ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
if(!is_valid_ether_addr(netdev->perm_addr)) {
DPRINTK(PROBE, ERR, "After reset, invalid MAC address.\n");
return PCI_ERS_RESULT_DISCONNECT;
}
return PCI_ERS_RESULT_RECOVERED;
}
/**
* ixgb_io_resume - called when its OK to resume normal operations
* @pdev pointer to pci device with error
*
* The error recovery driver tells us that its OK to resume
* normal operation. Implementation resembles the second-half
* of the ixgb_probe() routine.
*/
static void ixgb_io_resume (struct pci_dev *pdev)
{
struct net_device *netdev = pci_get_drvdata(pdev);
struct ixgb_adapter *adapter = netdev->priv;
pci_set_master(pdev);
if(netif_running(netdev)) {
if(ixgb_up(adapter)) {
printk ("ixgb: can't bring device back up after reset\n");
return;
}
}
netif_device_attach(netdev);
mod_timer(&adapter->watchdog_timer, jiffies);
}
/* ixgb_main.c */