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netxen_nic: Avoid mixed mode interrupts

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o Adapters do not support co-existence of INTx Interrupt with
  MSI-X or MSI among multiple functions. Prevent attaching
  of a function during normal load, if adapter gets into mixed
  mode of interrupts

Signed-off-by: Manish Chopra <manish.chopra@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Manish Chopra 2013-05-30 09:51:37 +00:00 committed by David S. Miller
parent a120e86467
commit b37eb210c0
2 changed files with 46 additions and 7 deletions
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3
drivers/net/ethernet/qlogic/netxen/netxen_nic_hdr.h
View File

@ -734,6 +734,9 @@ enum {
#define NIC_CRB_BASE_2 (NETXEN_CAM_RAM(0x700))
#define NETXEN_NIC_REG(X) (NIC_CRB_BASE+(X))
#define NETXEN_NIC_REG_2(X) (NIC_CRB_BASE_2+(X))
#define NETXEN_INTR_MODE_REG NETXEN_NIC_REG(0x44)
#define NETXEN_MSI_MODE 0x1
#define NETXEN_INTX_MODE 0x2
#define NX_CDRP_CRB_OFFSET (NETXEN_NIC_REG(0x18))
#define NX_ARG1_CRB_OFFSET (NETXEN_NIC_REG(0x1c))

50
drivers/net/ethernet/qlogic/netxen/netxen_nic_main.c
View File

@ -592,6 +592,22 @@ static const struct net_device_ops netxen_netdev_ops = {
#endif
};
static inline bool netxen_function_zero(struct pci_dev *pdev)
{
return (PCI_FUNC(pdev->devfn) == 0) ? true : false;
}
static inline void netxen_set_interrupt_mode(struct netxen_adapter *adapter,
u32 mode)
{
NXWR32(adapter, NETXEN_INTR_MODE_REG, mode);
}
static inline u32 netxen_get_interrupt_mode(struct netxen_adapter *adapter)
{
return NXRD32(adapter, NETXEN_INTR_MODE_REG);
}
static void
netxen_initialize_interrupt_registers(struct netxen_adapter *adapter)
{
@ -654,10 +670,11 @@ static int netxen_setup_msi_interrupts(struct netxen_adapter *adapter,
return 0;
}
dev_err(&pdev->dev, "Failed to acquire MSI-X/MSI interrupt vector\n");
return -EIO;
}
static void netxen_setup_intr(struct netxen_adapter *adapter)
static int netxen_setup_intr(struct netxen_adapter *adapter)
{
struct pci_dev *pdev = adapter->pdev;
int num_msix;
@ -674,11 +691,24 @@ static void netxen_setup_intr(struct netxen_adapter *adapter)
netxen_initialize_interrupt_registers(adapter);
netxen_set_msix_bit(pdev, 0);
if (!netxen_setup_msi_interrupts(adapter, num_msix))
return;
if (netxen_function_zero(pdev)) {
if (!netxen_setup_msi_interrupts(adapter, num_msix))
netxen_set_interrupt_mode(adapter, NETXEN_MSI_MODE);
else
netxen_set_interrupt_mode(adapter, NETXEN_INTX_MODE);
} else {
if (netxen_get_interrupt_mode(adapter) == NETXEN_MSI_MODE &&
netxen_setup_msi_interrupts(adapter, num_msix)) {
dev_err(&pdev->dev, "Co-existence of MSI-X/MSI and INTx interrupts is not supported\n");
return -EIO;
}
}
adapter->msix_entries[0].vector = pdev->irq;
dev_info(&pdev->dev, "using legacy interrupts\n");
if (!NETXEN_IS_MSI_FAMILY(adapter)) {
adapter->msix_entries[0].vector = pdev->irq;
dev_info(&pdev->dev, "using legacy interrupts\n");
}
return 0;
}
static void
@ -1525,7 +1555,13 @@ netxen_nic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
netxen_nic_clear_stats(adapter);
netxen_setup_intr(adapter);
err = netxen_setup_intr(adapter);
if (err) {
dev_err(&adapter->pdev->dev,
"Failed to setup interrupts, error = %d\n", err);
goto err_out_disable_msi;
}
err = netxen_setup_netdev(adapter, netdev);
if (err)
@ -1613,7 +1649,7 @@ static void netxen_nic_remove(struct pci_dev *pdev)
clear_bit(__NX_RESETTING, &adapter->state);
netxen_teardown_intr(adapter);
netxen_set_interrupt_mode(adapter, 0);
netxen_remove_diag_entries(adapter);
netxen_cleanup_pci_map(adapter);