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igb: fix tx data corruption with transition to L0s on 82575

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The 82575 has an issue in which the DMA will go out of sync if the link
partner goes into an L0s state.  To prevent this we set the pci-e link
partner capability bits to disable the L0s transition on the hw.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Alexander Duyck 2008-10-16 21:26:57 -07:00 committed by Jeff Garzik
parent d4f12daf7b
commit c54106bb38
1 changed files with 26 additions and 2 deletions
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28
drivers/net/igb/igb_main.c
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@ -38,6 +38,7 @@
#include <linux/ethtool.h>
#include <linux/if_vlan.h>
#include <linux/pci.h>
#include <linux/pci-aspm.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/if_ether.h>
@ -966,10 +967,11 @@ static int __devinit igb_probe(struct pci_dev *pdev,
struct net_device *netdev;
struct igb_adapter *adapter;
struct e1000_hw *hw;
struct pci_dev *us_dev;
const struct e1000_info *ei = igb_info_tbl[ent->driver_data];
unsigned long mmio_start, mmio_len;
int i, err, pci_using_dac;
u16 eeprom_data = 0;
int i, err, pci_using_dac, pos;
u16 eeprom_data = 0, state = 0;
u16 eeprom_apme_mask = IGB_EEPROM_APME;
u32 part_num;
int bars, need_ioport;
@ -1004,6 +1006,28 @@ static int __devinit igb_probe(struct pci_dev *pdev,
}
}
/* 82575 requires that the pci-e link partner disable the L0s state */
switch (pdev->device) {
case E1000_DEV_ID_82575EB_COPPER:
case E1000_DEV_ID_82575EB_FIBER_SERDES:
case E1000_DEV_ID_82575GB_QUAD_COPPER:
us_dev = pdev->bus->self;
pos = pci_find_capability(us_dev, PCI_CAP_ID_EXP);
if (pos) {
pci_read_config_word(us_dev, pos + PCI_EXP_LNKCTL,
&state);
state &= ~PCIE_LINK_STATE_L0S;
pci_write_config_word(us_dev, pos + PCI_EXP_LNKCTL,
state);
printk(KERN_INFO "Disabling ASPM L0s upstream switch "
"port %x:%x.%x\n", us_dev->bus->number,
PCI_SLOT(us_dev->devfn),
PCI_FUNC(us_dev->devfn));
}
default:
break;
}
err = pci_request_selected_regions(pdev, bars, igb_driver_name);
if (err)
goto err_pci_reg;