igb: fix tx data corruption with transition to L0s on 82575
authorAlexander Duyck <alexander.h.duyck@intel.com>
Fri, 17 Oct 2008 04:26:57 +0000 (21:26 -0700)
committerJeff Garzik <jgarzik@redhat.com>
Wed, 22 Oct 2008 10:53:59 +0000 (06:53 -0400)
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>
drivers/net/igb/igb_main.c

index 93d02efa9a0a614167d6dc533178aeaa02cf5556..33bd7bb0aacd080b9e0aa62b65a15d4739920012 100644 (file)
@@ -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;