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tg3: Fix 5719 internal FIFO overflow problem

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Under load, there an internal FIFO can overflow on the 5719.  The fix is
to scale back the PCIe maximum read request size based on the current
link speed and width.

Signed-off-by: Matt Carlson <mcarlson@broadcom.com>
Reviewed-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Matt Carlson 2010-11-24 08:31:48 +00:00 committed by David S. Miller
parent d2394e6bb1
commit cf79003d59
2 changed files with 42 additions and 3 deletions
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44
drivers/net/tg3.c
View file

@ -6985,7 +6985,7 @@ static void tg3_restore_pci_state(struct tg3 *tp)
if (GET_ASIC_REV(tp->pci_chip_rev_id) != ASIC_REV_5785) {
if (tp->tg3_flags2 & TG3_FLG2_PCI_EXPRESS)
pcie_set_readrq(tp->pdev, 4096);
pcie_set_readrq(tp->pdev, tp->pcie_readrq);
else {
pci_write_config_byte(tp->pdev, PCI_CACHE_LINE_SIZE,
tp->pci_cacheline_sz);
@ -7179,7 +7179,7 @@ static int tg3_chip_reset(struct tg3 *tp)
tp->pcie_cap + PCI_EXP_DEVCTL,
val16);
pcie_set_readrq(tp->pdev, 4096);
pcie_set_readrq(tp->pdev, tp->pcie_readrq);
/* Clear error status */
pci_write_config_word(tp->pdev,
@ -13366,7 +13366,45 @@ static int __devinit tg3_get_invariants(struct tg3 *tp)
tp->tg3_flags2 |= TG3_FLG2_PCI_EXPRESS;
pcie_set_readrq(tp->pdev, 4096);
tp->pcie_readrq = 4096;
if (GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5719) {
u16 word;
pci_read_config_word(tp->pdev,
tp->pcie_cap + PCI_EXP_LNKSTA,
&word);
switch (word & PCI_EXP_LNKSTA_CLS) {
case PCI_EXP_LNKSTA_CLS_2_5GB:
word &= PCI_EXP_LNKSTA_NLW;
word >>= PCI_EXP_LNKSTA_NLW_SHIFT;
switch (word) {
case 2:
tp->pcie_readrq = 2048;
break;
case 4:
tp->pcie_readrq = 1024;
break;
}
break;
case PCI_EXP_LNKSTA_CLS_5_0GB:
word &= PCI_EXP_LNKSTA_NLW;
word >>= PCI_EXP_LNKSTA_NLW_SHIFT;
switch (word) {
case 1:
tp->pcie_readrq = 2048;
break;
case 2:
tp->pcie_readrq = 1024;
break;
case 4:
tp->pcie_readrq = 512;
break;
}
}
}
pcie_set_readrq(tp->pdev, tp->pcie_readrq);
pci_read_config_word(tp->pdev,
tp->pcie_cap + PCI_EXP_LNKCTL,

1
drivers/net/tg3.h
View file

@ -2948,6 +2948,7 @@ struct tg3 {
int pcix_cap;
int pcie_cap;
};
int pcie_readrq;
struct mii_bus *mdio_bus;
int mdio_irq[PHY_MAX_ADDR];