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authorStephen Hemminger <shemminger@osdl.org>2006-05-18 11:16:21 -0700
committerJeff Garzik <jeff@garzik.org>2006-05-20 00:15:39 -0400
commitee7abb04df92b444069be8fe47d66d809de23782 (patch)
treeb96478a17f08aed0955ea6fba06cc9dde8f517fe /drivers/net/sky2.c
parent38bb6b288bf4fb954a3793e57c7339774c842a54 (diff)
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[PATCH] sky2: allow dual port usage
If both ports are receiving on the SysKonnect dual port cards, then it appears the bus interface unit can give an interrupt status for frame before DMA has completed. This leads to bogus frames and general confusion. This is why receive checksumming is also messed up on dual port cards. A workaround for the out of order receive problem is to eliminating split transactions on PCI-X. This version is based of the current linux-2.6.git including earlier patch to disable dual ports. Signed-off-by: Stephen Hemminger <shemminger@osdl.org> Signed-off-by: Jeff Garzik <jeff@garzik.org>
Diffstat (limited to 'drivers/net/sky2.c')
-rw-r--r--drivers/net/sky2.c32
1 files changed, 17 insertions, 15 deletions
diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c
index 62be6d9..277c57b 100644
--- a/drivers/net/sky2.c
+++ b/drivers/net/sky2.c
@@ -1020,19 +1020,26 @@ static int sky2_up(struct net_device *dev)
struct sky2_hw *hw = sky2->hw;
unsigned port = sky2->port;
u32 ramsize, rxspace, imask;
- int err;
+ int cap, err = -ENOMEM;
struct net_device *otherdev = hw->dev[sky2->port^1];
- /* Block bringing up both ports at the same time on a dual port card.
- * There is an unfixed bug where receiver gets confused and picks up
- * packets out of order. Until this is fixed, prevent data corruption.
+ /*
+ * On dual port PCI-X card, there is an problem where status
+ * can be received out of order due to split transactions
*/
- if (otherdev && netif_running(otherdev)) {
- printk(KERN_INFO PFX "dual port support is disabled.\n");
- return -EBUSY;
- }
+ if (otherdev && netif_running(otherdev) &&
+ (cap = pci_find_capability(hw->pdev, PCI_CAP_ID_PCIX))) {
+ struct sky2_port *osky2 = netdev_priv(otherdev);
+ u16 cmd;
+
+ cmd = sky2_pci_read16(hw, cap + PCI_X_CMD);
+ cmd &= ~PCI_X_CMD_MAX_SPLIT;
+ sky2_pci_write16(hw, cap + PCI_X_CMD, cmd);
+
+ sky2->rx_csum = 0;
+ osky2->rx_csum = 0;
+ }
- err = -ENOMEM;
if (netif_msg_ifup(sky2))
printk(KERN_INFO PFX "%s: enabling interface\n", dev->name);
@@ -3078,12 +3085,7 @@ static __devinit struct net_device *sky2_init_netdev(struct sky2_hw *hw,
sky2->duplex = -1;
sky2->speed = -1;
sky2->advertising = sky2_supported_modes(hw);
-
- /* Receive checksum disabled for Yukon XL
- * because of observed problems with incorrect
- * values when multiple packets are received in one interrupt
- */
- sky2->rx_csum = (hw->chip_id != CHIP_ID_YUKON_XL);
+ sky2->rx_csum = 1;
spin_lock_init(&sky2->phy_lock);
sky2->tx_pending = TX_DEF_PENDING;