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authorMatt Carlson <mcarlson@broadcom.com>2007-11-12 21:19:37 -0800
committerDavid S. Miller <davem@davemloft.net>2007-11-12 21:19:37 -0800
commit5f5c51e3d473d8ddc0c32156c2b27e2fe92b9b57 (patch)
tree46c1c182a79c9aaf4b65cf3a360380c8482bd007 /drivers
parentaa6c91fe5913faa2cd2a62de993a3130799412b1 (diff)
[TG3]: Increase the PCI MRRS
Previous devices hardcoded the PCI Maximum Read Request Size to 4K. To better comply with the PCI spec, the hardware now defaults the MRRS to 512 bytes. This will yield poor driver performance if left untouched. This patch increases the MRRS to 4K on driver initialization. Signed-off-by: Matt Carlson <mcarlson@broadcom.com> Signed-off-by: Michael Chan <mchan@broadcom.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/net/tg3.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index ecd64a224e9..72db78b1ec3 100644
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -5098,12 +5098,15 @@ static void tg3_restore_pci_state(struct tg3 *tp)
pci_write_config_word(tp->pdev, PCI_COMMAND, tp->pci_cmd);
- if (!(tp->tg3_flags2 & TG3_FLG2_PCI_EXPRESS)) {
+ if (tp->tg3_flags2 & TG3_FLG2_PCI_EXPRESS)
+ pcie_set_readrq(tp->pdev, 4096);
+ else {
pci_write_config_byte(tp->pdev, PCI_CACHE_LINE_SIZE,
tp->pci_cacheline_sz);
pci_write_config_byte(tp->pdev, PCI_LATENCY_TIMER,
tp->pci_lat_timer);
}
+
/* Make sure PCI-X relaxed ordering bit is clear. */
if (tp->pcix_cap) {
u16 pcix_cmd;
@@ -11215,6 +11218,9 @@ static int __devinit tg3_get_invariants(struct tg3 *tp)
pcie_cap = pci_find_capability(tp->pdev, PCI_CAP_ID_EXP);
if (pcie_cap != 0) {
tp->tg3_flags2 |= TG3_FLG2_PCI_EXPRESS;
+
+ pcie_set_readrq(tp->pdev, 4096);
+
if (GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5906) {
u16 lnkctl;