From b37eb210c076b0465fcb8d14694fcce3f267ac63 Mon Sep 17 00:00:00 2001 From: Manish Chopra Date: Thu, 30 May 2013 09:51:37 +0000 Subject: [PATCH] netxen_nic: Avoid mixed mode interrupts 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 Signed-off-by: David S. Miller --- .../ethernet/qlogic/netxen/netxen_nic_hdr.h | 3 ++ .../ethernet/qlogic/netxen/netxen_nic_main.c | 50 ++++++++++++++++--- 2 files changed, 46 insertions(+), 7 deletions(-) diff --git a/drivers/net/ethernet/qlogic/netxen/netxen_nic_hdr.h b/drivers/net/ethernet/qlogic/netxen/netxen_nic_hdr.h index 28e076960bcb..32c790659f9c 100644 --- a/drivers/net/ethernet/qlogic/netxen/netxen_nic_hdr.h +++ b/drivers/net/ethernet/qlogic/netxen/netxen_nic_hdr.h @@ -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)) diff --git a/drivers/net/ethernet/qlogic/netxen/netxen_nic_main.c b/drivers/net/ethernet/qlogic/netxen/netxen_nic_main.c index 927ae9f801fb..20c7b3c12b56 100644 --- a/drivers/net/ethernet/qlogic/netxen/netxen_nic_main.c +++ b/drivers/net/ethernet/qlogic/netxen/netxen_nic_main.c @@ -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); -- 2.39.5