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https://github.com/torvalds/linux
synced 2024-11-05 18:23:50 +00:00
igb: Enable SR-IOV configuration via PCI sysfs interface
Implement callback in the driver for the new PCI bus driver interface that allows the user to enable/disable SR-IOV virtual functions in a device via the sysfs interface. Signed-off-by: Greg Rose <gregory.v.rose@intel.com> Tested-by: Aaron Brown <aaron.f.brown@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Greg Rose
Jeff Kirsher
parent
b67e191307
commit
fa44f2f185
1 changed files with 219 additions and 101 deletions
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@ -193,6 +193,7 @@ static const struct dev_pm_ops igb_pm_ops = {
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};
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#endif
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static void igb_shutdown(struct pci_dev *);
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static int igb_pci_sriov_configure(struct pci_dev *dev, int num_vfs);
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#ifdef CONFIG_IGB_DCA
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static int igb_notify_dca(struct notifier_block *, unsigned long, void *);
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static struct notifier_block dca_notifier = {
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@ -234,6 +235,7 @@ static struct pci_driver igb_driver = {
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.driver.pm = &igb_pm_ops,
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#endif
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.shutdown = igb_shutdown,
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.sriov_configure = igb_pci_sriov_configure,
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.err_handler = &igb_err_handler
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};
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@ -2195,6 +2197,99 @@ static int igb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
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return err;
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}
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#ifdef CONFIG_PCI_IOV
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static int igb_disable_sriov(struct pci_dev *pdev)
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{
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struct net_device *netdev = pci_get_drvdata(pdev);
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struct igb_adapter *adapter = netdev_priv(netdev);
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struct e1000_hw *hw = &adapter->hw;
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/* reclaim resources allocated to VFs */
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if (adapter->vf_data) {
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/* disable iov and allow time for transactions to clear */
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if (igb_vfs_are_assigned(adapter)) {
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dev_warn(&pdev->dev,
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"Cannot deallocate SR-IOV virtual functions while they are assigned - VFs will not be deallocated\n");
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return -EPERM;
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} else {
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pci_disable_sriov(pdev);
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msleep(500);
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}
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kfree(adapter->vf_data);
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adapter->vf_data = NULL;
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adapter->vfs_allocated_count = 0;
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wr32(E1000_IOVCTL, E1000_IOVCTL_REUSE_VFQ);
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wrfl();
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msleep(100);
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dev_info(&pdev->dev, "IOV Disabled\n");
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/* Re-enable DMA Coalescing flag since IOV is turned off */
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adapter->flags |= IGB_FLAG_DMAC;
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}
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return 0;
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}
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static int igb_enable_sriov(struct pci_dev *pdev, int num_vfs)
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{
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struct net_device *netdev = pci_get_drvdata(pdev);
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struct igb_adapter *adapter = netdev_priv(netdev);
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int old_vfs = pci_num_vf(pdev);
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int err = 0;
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int i;
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if (!num_vfs)
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goto out;
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else if (old_vfs && old_vfs == num_vfs)
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goto out;
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else if (old_vfs && old_vfs != num_vfs)
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err = igb_disable_sriov(pdev);
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if (err)
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goto out;
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if (num_vfs > 7) {
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err = -EPERM;
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goto out;
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}
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adapter->vfs_allocated_count = num_vfs;
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adapter->vf_data = kcalloc(adapter->vfs_allocated_count,
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sizeof(struct vf_data_storage), GFP_KERNEL);
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/* if allocation failed then we do not support SR-IOV */
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if (!adapter->vf_data) {
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adapter->vfs_allocated_count = 0;
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dev_err(&pdev->dev,
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"Unable to allocate memory for VF Data Storage\n");
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err = -ENOMEM;
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goto out;
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}
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err = pci_enable_sriov(pdev, adapter->vfs_allocated_count);
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if (err)
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goto err_out;
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dev_info(&pdev->dev, "%d VFs allocated\n",
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adapter->vfs_allocated_count);
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for (i = 0; i < adapter->vfs_allocated_count; i++)
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igb_vf_configure(adapter, i);
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/* DMA Coalescing is not supported in IOV mode. */
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adapter->flags &= ~IGB_FLAG_DMAC;
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goto out;
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err_out:
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kfree(adapter->vf_data);
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adapter->vf_data = NULL;
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adapter->vfs_allocated_count = 0;
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out:
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return err;
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}
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#endif
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/**
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* igb_remove - Device Removal Routine
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* @pdev: PCI device information struct
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@ -2242,23 +2337,7 @@ static void igb_remove(struct pci_dev *pdev)
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igb_clear_interrupt_scheme(adapter);
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#ifdef CONFIG_PCI_IOV
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/* reclaim resources allocated to VFs */
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if (adapter->vf_data) {
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/* disable iov and allow time for transactions to clear */
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if (igb_vfs_are_assigned(adapter)) {
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dev_info(&pdev->dev, "Unloading driver while VFs are assigned - VFs will not be deallocated\n");
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} else {
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pci_disable_sriov(pdev);
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msleep(500);
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}
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kfree(adapter->vf_data);
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adapter->vf_data = NULL;
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wr32(E1000_IOVCTL, E1000_IOVCTL_REUSE_VFQ);
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wrfl();
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msleep(100);
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dev_info(&pdev->dev, "IOV Disabled\n");
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}
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igb_disable_sriov(pdev);
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#endif
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iounmap(hw->hw_addr);
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@ -2289,103 +2368,22 @@ static void igb_probe_vfs(struct igb_adapter *adapter)
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#ifdef CONFIG_PCI_IOV
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struct pci_dev *pdev = adapter->pdev;
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struct e1000_hw *hw = &adapter->hw;
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int old_vfs = pci_num_vf(adapter->pdev);
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int i;
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/* Virtualization features not supported on i210 family. */
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if ((hw->mac.type == e1000_i210) || (hw->mac.type == e1000_i211))
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return;
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if (old_vfs) {
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dev_info(&pdev->dev, "%d pre-allocated VFs found - override "
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"max_vfs setting of %d\n", old_vfs, max_vfs);
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adapter->vfs_allocated_count = old_vfs;
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}
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igb_enable_sriov(pdev, max_vfs);
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pci_sriov_set_totalvfs(pdev, 7);
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if (!adapter->vfs_allocated_count)
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return;
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adapter->vf_data = kcalloc(adapter->vfs_allocated_count,
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sizeof(struct vf_data_storage), GFP_KERNEL);
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/* if allocation failed then we do not support SR-IOV */
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if (!adapter->vf_data) {
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adapter->vfs_allocated_count = 0;
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dev_err(&pdev->dev, "Unable to allocate memory for VF "
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"Data Storage\n");
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goto out;
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}
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if (!old_vfs) {
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if (pci_enable_sriov(pdev, adapter->vfs_allocated_count))
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goto err_out;
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}
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dev_info(&pdev->dev, "%d VFs allocated\n",
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adapter->vfs_allocated_count);
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for (i = 0; i < adapter->vfs_allocated_count; i++)
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igb_vf_configure(adapter, i);
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/* DMA Coalescing is not supported in IOV mode. */
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adapter->flags &= ~IGB_FLAG_DMAC;
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goto out;
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err_out:
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kfree(adapter->vf_data);
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adapter->vf_data = NULL;
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adapter->vfs_allocated_count = 0;
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out:
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return;
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#endif /* CONFIG_PCI_IOV */
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}
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/**
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* igb_sw_init - Initialize general software structures (struct igb_adapter)
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* @adapter: board private structure to initialize
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*
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* igb_sw_init initializes the Adapter private data structure.
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* Fields are initialized based on PCI device information and
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* OS network device settings (MTU size).
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**/
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static int igb_sw_init(struct igb_adapter *adapter)
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static void igb_init_queue_configuration(struct igb_adapter *adapter)
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{
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struct e1000_hw *hw = &adapter->hw;
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struct net_device *netdev = adapter->netdev;
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struct pci_dev *pdev = adapter->pdev;
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u32 max_rss_queues;
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pci_read_config_word(pdev, PCI_COMMAND, &hw->bus.pci_cmd_word);
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/* set default ring sizes */
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adapter->tx_ring_count = IGB_DEFAULT_TXD;
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adapter->rx_ring_count = IGB_DEFAULT_RXD;
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/* set default ITR values */
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adapter->rx_itr_setting = IGB_DEFAULT_ITR;
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adapter->tx_itr_setting = IGB_DEFAULT_ITR;
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/* set default work limits */
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adapter->tx_work_limit = IGB_DEFAULT_TX_WORK;
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adapter->max_frame_size = netdev->mtu + ETH_HLEN + ETH_FCS_LEN +
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VLAN_HLEN;
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adapter->min_frame_size = ETH_ZLEN + ETH_FCS_LEN;
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spin_lock_init(&adapter->stats64_lock);
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#ifdef CONFIG_PCI_IOV
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switch (hw->mac.type) {
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case e1000_82576:
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case e1000_i350:
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if (max_vfs > 7) {
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dev_warn(&pdev->dev,
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"Maximum of 7 VFs per PF, using max\n");
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adapter->vfs_allocated_count = 7;
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} else
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adapter->vfs_allocated_count = max_vfs;
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break;
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default:
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break;
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}
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#endif /* CONFIG_PCI_IOV */
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/* Determine the maximum number of RSS queues supported. */
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switch (hw->mac.type) {
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case e1000_i211:
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@ -2444,6 +2442,60 @@ static int igb_sw_init(struct igb_adapter *adapter)
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adapter->flags |= IGB_FLAG_QUEUE_PAIRS;
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break;
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}
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}
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/**
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* igb_sw_init - Initialize general software structures (struct igb_adapter)
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* @adapter: board private structure to initialize
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*
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* igb_sw_init initializes the Adapter private data structure.
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* Fields are initialized based on PCI device information and
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* OS network device settings (MTU size).
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**/
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static int igb_sw_init(struct igb_adapter *adapter)
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{
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struct e1000_hw *hw = &adapter->hw;
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struct net_device *netdev = adapter->netdev;
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struct pci_dev *pdev = adapter->pdev;
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pci_read_config_word(pdev, PCI_COMMAND, &hw->bus.pci_cmd_word);
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/* set default ring sizes */
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adapter->tx_ring_count = IGB_DEFAULT_TXD;
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adapter->rx_ring_count = IGB_DEFAULT_RXD;
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/* set default ITR values */
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adapter->rx_itr_setting = IGB_DEFAULT_ITR;
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adapter->tx_itr_setting = IGB_DEFAULT_ITR;
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/* set default work limits */
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adapter->tx_work_limit = IGB_DEFAULT_TX_WORK;
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adapter->max_frame_size = netdev->mtu + ETH_HLEN + ETH_FCS_LEN +
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VLAN_HLEN;
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adapter->min_frame_size = ETH_ZLEN + ETH_FCS_LEN;
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spin_lock_init(&adapter->stats64_lock);
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#ifdef CONFIG_PCI_IOV
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switch (hw->mac.type) {
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case e1000_82576:
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case e1000_i350:
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if (max_vfs > 7) {
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dev_warn(&pdev->dev,
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"Maximum of 7 VFs per PF, using max\n");
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adapter->vfs_allocated_count = 7;
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} else
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adapter->vfs_allocated_count = max_vfs;
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if (adapter->vfs_allocated_count)
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dev_warn(&pdev->dev,
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"Enabling SR-IOV VFs using the module parameter is deprecated - please use the pci sysfs interface.\n");
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break;
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default:
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break;
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}
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#endif /* CONFIG_PCI_IOV */
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igb_init_queue_configuration(adapter);
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/* Setup and initialize a copy of the hw vlan table array */
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adapter->shadow_vfta = kzalloc(sizeof(u32) *
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@ -6902,6 +6954,72 @@ static void igb_shutdown(struct pci_dev *pdev)
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}
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}
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#ifdef CONFIG_PCI_IOV
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static int igb_sriov_reinit(struct pci_dev *dev)
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{
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struct net_device *netdev = pci_get_drvdata(dev);
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struct igb_adapter *adapter = netdev_priv(netdev);
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struct pci_dev *pdev = adapter->pdev;
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rtnl_lock();
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if (netif_running(netdev))
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igb_close(netdev);
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igb_clear_interrupt_scheme(adapter);
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igb_init_queue_configuration(adapter);
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if (igb_init_interrupt_scheme(adapter, true)) {
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dev_err(&pdev->dev, "Unable to allocate memory for queues\n");
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return -ENOMEM;
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}
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if (netif_running(netdev))
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igb_open(netdev);
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rtnl_unlock();
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return 0;
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}
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static int igb_pci_disable_sriov(struct pci_dev *dev)
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{
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int err = igb_disable_sriov(dev);
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if (!err)
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err = igb_sriov_reinit(dev);
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return err;
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}
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static int igb_pci_enable_sriov(struct pci_dev *dev, int num_vfs)
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{
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int err = igb_enable_sriov(dev, num_vfs);
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if (err)
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goto out;
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err = igb_sriov_reinit(dev);
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if (!err)
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return num_vfs;
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out:
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return err;
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}
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#endif
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static int igb_pci_sriov_configure(struct pci_dev *dev, int num_vfs)
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{
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#ifdef CONFIG_PCI_IOV
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if (num_vfs == 0)
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return igb_pci_disable_sriov(dev);
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else
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return igb_pci_enable_sriov(dev, num_vfs);
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#endif
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return 0;
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}
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#ifdef CONFIG_NET_POLL_CONTROLLER
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/*
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* Polling 'interrupt' - used by things like netconsole to send skbs
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