From da36b64736cf2552e7fb5109c0255d4af804f5e7 Mon Sep 17 00:00:00 2001 From: Greg Rose Date: Tue, 11 Dec 2012 08:26:43 +0000 Subject: [PATCH] ixgbe: Implement PCI SR-IOV sysfs callback operation Implement callbacks in the driver for the new PCI bus driver interface that allows the user to enable/disable SR-IOV VFs in a device via the sysfs interface. Signed-off-by: Greg Rose CC: Don Dutile Tested-by: Phil Schmitt Tested-by: Sibai Li Signed-off-by: Jeff Kirsher --- drivers/net/ethernet/intel/ixgbe/ixgbe.h | 3 + drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 31 ++++++- .../net/ethernet/intel/ixgbe/ixgbe_sriov.c | 91 ++++++++++++++++++- .../net/ethernet/intel/ixgbe/ixgbe_sriov.h | 3 +- 4 files changed, 122 insertions(+), 6 deletions(-) diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe.h b/drivers/net/ethernet/intel/ixgbe/ixgbe.h index cd4c83b1a977..8371ae4265fe 100644 --- a/drivers/net/ethernet/intel/ixgbe/ixgbe.h +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe.h @@ -778,5 +778,8 @@ extern int ixgbe_ptp_hwtstamp_ioctl(struct ixgbe_adapter *adapter, extern void ixgbe_ptp_start_cyclecounter(struct ixgbe_adapter *adapter); extern void ixgbe_ptp_reset(struct ixgbe_adapter *adapter); extern void ixgbe_ptp_check_pps_event(struct ixgbe_adapter *adapter, u32 eicr); +#ifdef CONFIG_PCI_IOV +void ixgbe_sriov_reinit(struct ixgbe_adapter *adapter); +#endif #endif /* _IXGBE_H_ */ diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c index 2472dc85db0d..5e3ed33215f7 100644 --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c @@ -6836,6 +6836,26 @@ int ixgbe_setup_tc(struct net_device *dev, u8 tc) } #endif /* CONFIG_IXGBE_DCB */ +#ifdef CONFIG_PCI_IOV +void ixgbe_sriov_reinit(struct ixgbe_adapter *adapter) +{ + struct net_device *netdev = adapter->netdev; + + rtnl_lock(); +#ifdef CONFIG_IXGBE_DCB + ixgbe_setup_tc(netdev, netdev_get_num_tc(netdev)); +#else + if (netif_running(netdev)) + ixgbe_close(netdev); + ixgbe_clear_interrupt_scheme(adapter); + ixgbe_init_interrupt_scheme(adapter); + if (netif_running(netdev)) + ixgbe_open(netdev); +#endif + rtnl_unlock(); +} + +#endif void ixgbe_do_reset(struct net_device *netdev) { struct ixgbe_adapter *adapter = netdev_priv(netdev); @@ -7625,8 +7645,14 @@ static void ixgbe_remove(struct pci_dev *pdev) if (netdev->reg_state == NETREG_REGISTERED) unregister_netdev(netdev); - ixgbe_disable_sriov(adapter); - +#ifdef CONFIG_PCI_IOV + /* + * Only disable SR-IOV on unload if the user specified the now + * deprecated max_vfs module parameter. + */ + if (max_vfs) + ixgbe_disable_sriov(adapter); +#endif ixgbe_clear_interrupt_scheme(adapter); ixgbe_release_hw_control(adapter); @@ -7840,6 +7866,7 @@ static struct pci_driver ixgbe_driver = { .resume = ixgbe_resume, #endif .shutdown = ixgbe_shutdown, + .sriov_configure = ixgbe_pci_sriov_configure, .err_handler = &ixgbe_err_handler }; diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c index 8a284ac4b400..ee3507f0ea53 100644 --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c @@ -207,11 +207,12 @@ static bool ixgbe_vfs_are_assigned(struct ixgbe_adapter *adapter) } #endif /* #ifdef CONFIG_PCI_IOV */ -void ixgbe_disable_sriov(struct ixgbe_adapter *adapter) +int ixgbe_disable_sriov(struct ixgbe_adapter *adapter) { struct ixgbe_hw *hw = &adapter->hw; u32 gpie; u32 vmdctl; + int rss; /* set num VFs to 0 to prevent access to vfinfo */ adapter->num_vfs = 0; @@ -226,7 +227,7 @@ void ixgbe_disable_sriov(struct ixgbe_adapter *adapter) /* if SR-IOV is already disabled then there is nothing to do */ if (!(adapter->flags & IXGBE_FLAG_SRIOV_ENABLED)) - return; + return 0; #ifdef CONFIG_PCI_IOV /* @@ -236,7 +237,7 @@ void ixgbe_disable_sriov(struct ixgbe_adapter *adapter) */ if (ixgbe_vfs_are_assigned(adapter)) { e_dev_warn("Unloading driver while VFs are assigned - VFs will not be deallocated\n"); - return; + return -EPERM; } /* disable iov and allow time for transactions to clear */ pci_disable_sriov(adapter->pdev); @@ -259,10 +260,94 @@ void ixgbe_disable_sriov(struct ixgbe_adapter *adapter) adapter->flags &= ~IXGBE_FLAG_VMDQ_ENABLED; adapter->ring_feature[RING_F_VMDQ].offset = 0; + rss = min_t(int, IXGBE_MAX_RSS_INDICES, num_online_cpus()); + adapter->ring_feature[RING_F_RSS].limit = rss; + /* take a breather then clean up driver data */ msleep(100); adapter->flags &= ~IXGBE_FLAG_SRIOV_ENABLED; + return 0; +} + +static int ixgbe_pci_sriov_enable(struct pci_dev *dev, int num_vfs) +{ +#ifdef CONFIG_PCI_IOV + struct ixgbe_adapter *adapter = pci_get_drvdata(dev); + int err = 0; + int i; + int pre_existing_vfs = pci_num_vf(dev); + + if (pre_existing_vfs && pre_existing_vfs != num_vfs) + err = ixgbe_disable_sriov(adapter); + else if (pre_existing_vfs && pre_existing_vfs == num_vfs) + goto out; + + if (err) + goto err_out; + + /* While the SR-IOV capability structure reports total VFs to be + * 64 we limit the actual number that can be allocated to 63 so + * that some transmit/receive resources can be reserved to the + * PF. The PCI bus driver already checks for other values out of + * range. + */ + if (num_vfs > 63) { + err = -EPERM; + goto err_out; + } + + adapter->num_vfs = num_vfs; + + err = __ixgbe_enable_sriov(adapter); + if (err) + goto err_out; + + for (i = 0; i < adapter->num_vfs; i++) + ixgbe_vf_configuration(dev, (i | 0x10000000)); + + err = pci_enable_sriov(dev, num_vfs); + if (err) { + e_dev_warn("Failed to enable PCI sriov: %d\n", err); + goto err_out; + } + ixgbe_sriov_reinit(adapter); + +out: + return num_vfs; + +err_out: + return err; +#endif + return 0; +} + +static int ixgbe_pci_sriov_disable(struct pci_dev *dev) +{ + struct ixgbe_adapter *adapter = pci_get_drvdata(dev); + int err; + u32 current_flags = adapter->flags; + + err = ixgbe_disable_sriov(adapter); + + /* Only reinit if no error and state changed */ + if (!err && current_flags != adapter->flags) { + /* ixgbe_disable_sriov() doesn't clear VMDQ flag */ + adapter->flags &= ~IXGBE_FLAG_VMDQ_ENABLED; +#ifdef CONFIG_PCI_IOV + ixgbe_sriov_reinit(adapter); +#endif + } + + return err; +} + +int ixgbe_pci_sriov_configure(struct pci_dev *dev, int num_vfs) +{ + if (num_vfs == 0) + return ixgbe_pci_sriov_disable(dev); + else + return ixgbe_pci_sriov_enable(dev, num_vfs); } static int ixgbe_set_vf_multicasts(struct ixgbe_adapter *adapter, diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.h b/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.h index f693469b81ef..008f9cea68d1 100644 --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.h +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.h @@ -41,10 +41,11 @@ int ixgbe_ndo_set_vf_spoofchk(struct net_device *netdev, int vf, bool setting); int ixgbe_ndo_get_vf_config(struct net_device *netdev, int vf, struct ifla_vf_info *ivi); void ixgbe_check_vf_rate_limit(struct ixgbe_adapter *adapter); -void ixgbe_disable_sriov(struct ixgbe_adapter *adapter); +int ixgbe_disable_sriov(struct ixgbe_adapter *adapter); #ifdef CONFIG_PCI_IOV void ixgbe_enable_sriov(struct ixgbe_adapter *adapter); #endif +int ixgbe_pci_sriov_configure(struct pci_dev *dev, int num_vfs); static inline void ixgbe_set_vmvir(struct ixgbe_adapter *adapter, u16 vid, u16 qos, u32 vf) -- 2.30.2