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authorJeff Kirsher <jeffrey.t.kirsher@intel.com>2011-04-07 07:42:33 -0700
committerJeff Kirsher <jeffrey.t.kirsher@intel.com>2011-08-10 20:03:27 -0700
commitdee1ad47f2ee75f5146d83ca757c1b7861c34c3b (patch)
tree47cbdefe3d0f9b729724e378ad6a96eaddfd5fbc /drivers/net/ethernet/intel/ixgb/ixgb_main.c
parentf7917c009c28c941ba151ee66f04dc7f6a2e1e0b (diff)
downloadlinux-linaro-stable-dee1ad47f2ee75f5146d83ca757c1b7861c34c3b.tar.gz
intel: Move the Intel wired LAN drivers
Moves the Intel wired LAN drivers into drivers/net/ethernet/intel/ and the necessary Kconfig and Makefile changes. Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Diffstat (limited to 'drivers/net/ethernet/intel/ixgb/ixgb_main.c')
-rw-r--r--drivers/net/ethernet/intel/ixgb/ixgb_main.c2332
1 files changed, 2332 insertions, 0 deletions
diff --git a/drivers/net/ethernet/intel/ixgb/ixgb_main.c b/drivers/net/ethernet/intel/ixgb/ixgb_main.c
new file mode 100644
index 000000000000..6a130eb51cfa
--- /dev/null
+++ b/drivers/net/ethernet/intel/ixgb/ixgb_main.c
@@ -0,0 +1,2332 @@
+/*******************************************************************************
+
+ Intel PRO/10GbE Linux driver
+ Copyright(c) 1999 - 2008 Intel Corporation.
+
+ This program is free software; you can redistribute it and/or modify it
+ under the terms and conditions of the GNU General Public License,
+ version 2, as published by the Free Software Foundation.
+
+ This program is distributed in the hope it will be useful, but WITHOUT
+ ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ more details.
+
+ You should have received a copy of the GNU General Public License along with
+ this program; if not, write to the Free Software Foundation, Inc.,
+ 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+
+ The full GNU General Public License is included in this distribution in
+ the file called "COPYING".
+
+ Contact Information:
+ Linux NICS <linux.nics@intel.com>
+ e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
+ Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
+
+*******************************************************************************/
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/prefetch.h>
+#include "ixgb.h"
+
+char ixgb_driver_name[] = "ixgb";
+static char ixgb_driver_string[] = "Intel(R) PRO/10GbE Network Driver";
+
+#define DRIVERNAPI "-NAPI"
+#define DRV_VERSION "1.0.135-k2" DRIVERNAPI
+const char ixgb_driver_version[] = DRV_VERSION;
+static const char ixgb_copyright[] = "Copyright (c) 1999-2008 Intel Corporation.";
+
+#define IXGB_CB_LENGTH 256
+static unsigned int copybreak __read_mostly = IXGB_CB_LENGTH;
+module_param(copybreak, uint, 0644);
+MODULE_PARM_DESC(copybreak,
+ "Maximum size of packet that is copied to a new buffer on receive");
+
+/* ixgb_pci_tbl - PCI Device ID Table
+ *
+ * Wildcard entries (PCI_ANY_ID) should come last
+ * Last entry must be all 0s
+ *
+ * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
+ * Class, Class Mask, private data (not used) }
+ */
+static DEFINE_PCI_DEVICE_TABLE(ixgb_pci_tbl) = {
+ {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX,
+ PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
+ {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_CX4,
+ PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
+ {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_SR,
+ PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
+ {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_LR,
+ PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
+
+ /* required last entry */
+ {0,}
+};
+
+MODULE_DEVICE_TABLE(pci, ixgb_pci_tbl);
+
+/* Local Function Prototypes */
+static int ixgb_init_module(void);
+static void ixgb_exit_module(void);
+static int ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
+static void __devexit ixgb_remove(struct pci_dev *pdev);
+static int ixgb_sw_init(struct ixgb_adapter *adapter);
+static int ixgb_open(struct net_device *netdev);
+static int ixgb_close(struct net_device *netdev);
+static void ixgb_configure_tx(struct ixgb_adapter *adapter);
+static void ixgb_configure_rx(struct ixgb_adapter *adapter);
+static void ixgb_setup_rctl(struct ixgb_adapter *adapter);
+static void ixgb_clean_tx_ring(struct ixgb_adapter *adapter);
+static void ixgb_clean_rx_ring(struct ixgb_adapter *adapter);
+static void ixgb_set_multi(struct net_device *netdev);
+static void ixgb_watchdog(unsigned long data);
+static netdev_tx_t ixgb_xmit_frame(struct sk_buff *skb,
+ struct net_device *netdev);
+static struct net_device_stats *ixgb_get_stats(struct net_device *netdev);
+static int ixgb_change_mtu(struct net_device *netdev, int new_mtu);
+static int ixgb_set_mac(struct net_device *netdev, void *p);
+static irqreturn_t ixgb_intr(int irq, void *data);
+static bool ixgb_clean_tx_irq(struct ixgb_adapter *adapter);
+
+static int ixgb_clean(struct napi_struct *, int);
+static bool ixgb_clean_rx_irq(struct ixgb_adapter *, int *, int);
+static void ixgb_alloc_rx_buffers(struct ixgb_adapter *, int);
+
+static void ixgb_tx_timeout(struct net_device *dev);
+static void ixgb_tx_timeout_task(struct work_struct *work);
+
+static void ixgb_vlan_strip_enable(struct ixgb_adapter *adapter);
+static void ixgb_vlan_strip_disable(struct ixgb_adapter *adapter);
+static void ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid);
+static void ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid);
+static void ixgb_restore_vlan(struct ixgb_adapter *adapter);
+
+#ifdef CONFIG_NET_POLL_CONTROLLER
+/* for netdump / net console */
+static void ixgb_netpoll(struct net_device *dev);
+#endif
+
+static pci_ers_result_t ixgb_io_error_detected (struct pci_dev *pdev,
+ enum pci_channel_state state);
+static pci_ers_result_t ixgb_io_slot_reset (struct pci_dev *pdev);
+static void ixgb_io_resume (struct pci_dev *pdev);
+
+static struct pci_error_handlers ixgb_err_handler = {
+ .error_detected = ixgb_io_error_detected,
+ .slot_reset = ixgb_io_slot_reset,
+ .resume = ixgb_io_resume,
+};
+
+static struct pci_driver ixgb_driver = {
+ .name = ixgb_driver_name,
+ .id_table = ixgb_pci_tbl,
+ .probe = ixgb_probe,
+ .remove = __devexit_p(ixgb_remove),
+ .err_handler = &ixgb_err_handler
+};
+
+MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
+MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(DRV_VERSION);
+
+#define DEFAULT_DEBUG_LEVEL_SHIFT 3
+static int debug = DEFAULT_DEBUG_LEVEL_SHIFT;
+module_param(debug, int, 0);
+MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
+
+/**
+ * ixgb_init_module - Driver Registration Routine
+ *
+ * ixgb_init_module is the first routine called when the driver is
+ * loaded. All it does is register with the PCI subsystem.
+ **/
+
+static int __init
+ixgb_init_module(void)
+{
+ pr_info("%s - version %s\n", ixgb_driver_string, ixgb_driver_version);
+ pr_info("%s\n", ixgb_copyright);
+
+ return pci_register_driver(&ixgb_driver);
+}
+
+module_init(ixgb_init_module);
+
+/**
+ * ixgb_exit_module - Driver Exit Cleanup Routine
+ *
+ * ixgb_exit_module is called just before the driver is removed
+ * from memory.
+ **/
+
+static void __exit
+ixgb_exit_module(void)
+{
+ pci_unregister_driver(&ixgb_driver);
+}
+
+module_exit(ixgb_exit_module);
+
+/**
+ * ixgb_irq_disable - Mask off interrupt generation on the NIC
+ * @adapter: board private structure
+ **/
+
+static void
+ixgb_irq_disable(struct ixgb_adapter *adapter)
+{
+ IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
+ IXGB_WRITE_FLUSH(&adapter->hw);
+ synchronize_irq(adapter->pdev->irq);
+}
+
+/**
+ * ixgb_irq_enable - Enable default interrupt generation settings
+ * @adapter: board private structure
+ **/
+
+static void
+ixgb_irq_enable(struct ixgb_adapter *adapter)
+{
+ u32 val = IXGB_INT_RXT0 | IXGB_INT_RXDMT0 |
+ IXGB_INT_TXDW | IXGB_INT_LSC;
+ if (adapter->hw.subsystem_vendor_id == SUN_SUBVENDOR_ID)
+ val |= IXGB_INT_GPI0;
+ IXGB_WRITE_REG(&adapter->hw, IMS, val);
+ IXGB_WRITE_FLUSH(&adapter->hw);
+}
+
+int
+ixgb_up(struct ixgb_adapter *adapter)
+{
+ struct net_device *netdev = adapter->netdev;
+ int err, irq_flags = IRQF_SHARED;
+ int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
+ struct ixgb_hw *hw = &adapter->hw;
+
+ /* hardware has been reset, we need to reload some things */
+
+ ixgb_rar_set(hw, netdev->dev_addr, 0);
+ ixgb_set_multi(netdev);
+
+ ixgb_restore_vlan(adapter);
+
+ ixgb_configure_tx(adapter);
+ ixgb_setup_rctl(adapter);
+ ixgb_configure_rx(adapter);
+ ixgb_alloc_rx_buffers(adapter, IXGB_DESC_UNUSED(&adapter->rx_ring));
+
+ /* disable interrupts and get the hardware into a known state */
+ IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);
+
+ /* only enable MSI if bus is in PCI-X mode */
+ if (IXGB_READ_REG(&adapter->hw, STATUS) & IXGB_STATUS_PCIX_MODE) {
+ err = pci_enable_msi(adapter->pdev);
+ if (!err) {
+ adapter->have_msi = 1;
+ irq_flags = 0;
+ }
+ /* proceed to try to request regular interrupt */
+ }
+
+ err = request_irq(adapter->pdev->irq, ixgb_intr, irq_flags,
+ netdev->name, netdev);
+ if (err) {
+ if (adapter->have_msi)
+ pci_disable_msi(adapter->pdev);
+ netif_err(adapter, probe, adapter->netdev,
+ "Unable to allocate interrupt Error: %d\n", err);
+ return err;
+ }
+
+ if ((hw->max_frame_size != max_frame) ||
+ (hw->max_frame_size !=
+ (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {
+
+ hw->max_frame_size = max_frame;
+
+ IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
+
+ if (hw->max_frame_size >
+ IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
+ u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
+
+ if (!(ctrl0 & IXGB_CTRL0_JFE)) {
+ ctrl0 |= IXGB_CTRL0_JFE;
+ IXGB_WRITE_REG(hw, CTRL0, ctrl0);
+ }
+ }
+ }
+
+ clear_bit(__IXGB_DOWN, &adapter->flags);
+
+ napi_enable(&adapter->napi);
+ ixgb_irq_enable(adapter);
+
+ netif_wake_queue(netdev);
+
+ mod_timer(&adapter->watchdog_timer, jiffies);
+
+ return 0;
+}
+
+void
+ixgb_down(struct ixgb_adapter *adapter, bool kill_watchdog)
+{
+ struct net_device *netdev = adapter->netdev;
+
+ /* prevent the interrupt handler from restarting watchdog */
+ set_bit(__IXGB_DOWN, &adapter->flags);
+
+ napi_disable(&adapter->napi);
+ /* waiting for NAPI to complete can re-enable interrupts */
+ ixgb_irq_disable(adapter);
+ free_irq(adapter->pdev->irq, netdev);
+
+ if (adapter->have_msi)
+ pci_disable_msi(adapter->pdev);
+
+ if (kill_watchdog)
+ del_timer_sync(&adapter->watchdog_timer);
+
+ adapter->link_speed = 0;
+ adapter->link_duplex = 0;
+ netif_carrier_off(netdev);
+ netif_stop_queue(netdev);
+
+ ixgb_reset(adapter);
+ ixgb_clean_tx_ring(adapter);
+ ixgb_clean_rx_ring(adapter);
+}
+
+void
+ixgb_reset(struct ixgb_adapter *adapter)
+{
+ struct ixgb_hw *hw = &adapter->hw;
+
+ ixgb_adapter_stop(hw);
+ if (!ixgb_init_hw(hw))
+ netif_err(adapter, probe, adapter->netdev, "ixgb_init_hw failed\n");
+
+ /* restore frame size information */
+ IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
+ if (hw->max_frame_size >
+ IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
+ u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
+ if (!(ctrl0 & IXGB_CTRL0_JFE)) {
+ ctrl0 |= IXGB_CTRL0_JFE;
+ IXGB_WRITE_REG(hw, CTRL0, ctrl0);
+ }
+ }
+}
+
+static const struct net_device_ops ixgb_netdev_ops = {
+ .ndo_open = ixgb_open,
+ .ndo_stop = ixgb_close,
+ .ndo_start_xmit = ixgb_xmit_frame,
+ .ndo_get_stats = ixgb_get_stats,
+ .ndo_set_multicast_list = ixgb_set_multi,
+ .ndo_validate_addr = eth_validate_addr,
+ .ndo_set_mac_address = ixgb_set_mac,
+ .ndo_change_mtu = ixgb_change_mtu,
+ .ndo_tx_timeout = ixgb_tx_timeout,
+ .ndo_vlan_rx_add_vid = ixgb_vlan_rx_add_vid,
+ .ndo_vlan_rx_kill_vid = ixgb_vlan_rx_kill_vid,
+#ifdef CONFIG_NET_POLL_CONTROLLER
+ .ndo_poll_controller = ixgb_netpoll,
+#endif
+};
+
+/**
+ * ixgb_probe - Device Initialization Routine
+ * @pdev: PCI device information struct
+ * @ent: entry in ixgb_pci_tbl
+ *
+ * Returns 0 on success, negative on failure
+ *
+ * ixgb_probe initializes an adapter identified by a pci_dev structure.
+ * The OS initialization, configuring of the adapter private structure,
+ * and a hardware reset occur.
+ **/
+
+static int __devinit
+ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
+{
+ struct net_device *netdev = NULL;
+ struct ixgb_adapter *adapter;
+ static int cards_found = 0;
+ int pci_using_dac;
+ int i;
+ int err;
+
+ err = pci_enable_device(pdev);
+ if (err)
+ return err;
+
+ pci_using_dac = 0;
+ err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(64));
+ if (!err) {
+ err = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64));
+ if (!err)
+ pci_using_dac = 1;
+ } else {
+ err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
+ if (err) {
+ err = dma_set_coherent_mask(&pdev->dev,
+ DMA_BIT_MASK(32));
+ if (err) {
+ pr_err("No usable DMA configuration, aborting\n");
+ goto err_dma_mask;
+ }
+ }
+ }
+
+ err = pci_request_regions(pdev, ixgb_driver_name);
+ if (err)
+ goto err_request_regions;
+
+ pci_set_master(pdev);
+
+ netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
+ if (!netdev) {
+ err = -ENOMEM;
+ goto err_alloc_etherdev;
+ }
+
+ SET_NETDEV_DEV(netdev, &pdev->dev);
+
+ pci_set_drvdata(pdev, netdev);
+ adapter = netdev_priv(netdev);
+ adapter->netdev = netdev;
+ adapter->pdev = pdev;
+ adapter->hw.back = adapter;
+ adapter->msg_enable = netif_msg_init(debug, DEFAULT_DEBUG_LEVEL_SHIFT);
+
+ adapter->hw.hw_addr = pci_ioremap_bar(pdev, BAR_0);
+ if (!adapter->hw.hw_addr) {
+ err = -EIO;
+ goto err_ioremap;
+ }
+
+ for (i = BAR_1; i <= BAR_5; i++) {
+ if (pci_resource_len(pdev, i) == 0)
+ continue;
+ if (pci_resource_flags(pdev, i) & IORESOURCE_IO) {
+ adapter->hw.io_base = pci_resource_start(pdev, i);
+ break;
+ }
+ }
+
+ netdev->netdev_ops = &ixgb_netdev_ops;
+ ixgb_set_ethtool_ops(netdev);
+ netdev->watchdog_timeo = 5 * HZ;
+ netif_napi_add(netdev, &adapter->napi, ixgb_clean, 64);
+
+ strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
+
+ adapter->bd_number = cards_found;
+ adapter->link_speed = 0;
+ adapter->link_duplex = 0;
+
+ /* setup the private structure */
+
+ err = ixgb_sw_init(adapter);
+ if (err)
+ goto err_sw_init;
+
+ netdev->features = NETIF_F_SG |
+ NETIF_F_HW_CSUM |
+ NETIF_F_HW_VLAN_TX |
+ NETIF_F_HW_VLAN_RX |
+ NETIF_F_HW_VLAN_FILTER;
+ netdev->features |= NETIF_F_TSO;
+
+ if (pci_using_dac) {
+ netdev->features |= NETIF_F_HIGHDMA;
+ netdev->vlan_features |= NETIF_F_HIGHDMA;
+ }
+
+ /* make sure the EEPROM is good */
+
+ if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
+ netif_err(adapter, probe, adapter->netdev,
+ "The EEPROM Checksum Is Not Valid\n");
+ err = -EIO;
+ goto err_eeprom;
+ }
+
+ ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
+ memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
+
+ if (!is_valid_ether_addr(netdev->perm_addr)) {
+ netif_err(adapter, probe, adapter->netdev, "Invalid MAC Address\n");
+ err = -EIO;
+ goto err_eeprom;
+ }
+
+ adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
+
+ init_timer(&adapter->watchdog_timer);
+ adapter->watchdog_timer.function = ixgb_watchdog;
+ adapter->watchdog_timer.data = (unsigned long)adapter;
+
+ INIT_WORK(&adapter->tx_timeout_task, ixgb_tx_timeout_task);
+
+ strcpy(netdev->name, "eth%d");
+ err = register_netdev(netdev);
+ if (err)
+ goto err_register;
+
+ /* carrier off reporting is important to ethtool even BEFORE open */
+ netif_carrier_off(netdev);
+
+ netif_info(adapter, probe, adapter->netdev,
+ "Intel(R) PRO/10GbE Network Connection\n");
+ ixgb_check_options(adapter);
+ /* reset the hardware with the new settings */
+
+ ixgb_reset(adapter);
+
+ cards_found++;
+ return 0;
+
+err_register:
+err_sw_init:
+err_eeprom:
+ iounmap(adapter->hw.hw_addr);
+err_ioremap:
+ free_netdev(netdev);
+err_alloc_etherdev:
+ pci_release_regions(pdev);
+err_request_regions:
+err_dma_mask:
+ pci_disable_device(pdev);
+ return err;
+}
+
+/**
+ * ixgb_remove - Device Removal Routine
+ * @pdev: PCI device information struct
+ *
+ * ixgb_remove is called by the PCI subsystem to alert the driver
+ * that it should release a PCI device. The could be caused by a
+ * Hot-Plug event, or because the driver is going to be removed from
+ * memory.
+ **/
+
+static void __devexit
+ixgb_remove(struct pci_dev *pdev)
+{
+ struct net_device *netdev = pci_get_drvdata(pdev);
+ struct ixgb_adapter *adapter = netdev_priv(netdev);
+
+ cancel_work_sync(&adapter->tx_timeout_task);
+
+ unregister_netdev(netdev);
+
+ iounmap(adapter->hw.hw_addr);
+ pci_release_regions(pdev);
+
+ free_netdev(netdev);
+ pci_disable_device(pdev);
+}
+
+/**
+ * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
+ * @adapter: board private structure to initialize
+ *
+ * ixgb_sw_init initializes the Adapter private data structure.
+ * Fields are initialized based on PCI device information and
+ * OS network device settings (MTU size).
+ **/
+
+static int __devinit
+ixgb_sw_init(struct ixgb_adapter *adapter)
+{
+ struct ixgb_hw *hw = &adapter->hw;
+ struct net_device *netdev = adapter->netdev;
+ struct pci_dev *pdev = adapter->pdev;
+
+ /* PCI config space info */
+
+ hw->vendor_id = pdev->vendor;
+ hw->device_id = pdev->device;
+ hw->subsystem_vendor_id = pdev->subsystem_vendor;
+ hw->subsystem_id = pdev->subsystem_device;
+
+ hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
+ adapter->rx_buffer_len = hw->max_frame_size + 8; /* + 8 for errata */
+
+ if ((hw->device_id == IXGB_DEVICE_ID_82597EX) ||
+ (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4) ||
+ (hw->device_id == IXGB_DEVICE_ID_82597EX_LR) ||
+ (hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
+ hw->mac_type = ixgb_82597;
+ else {
+ /* should never have loaded on this device */
+ netif_err(adapter, probe, adapter->netdev, "unsupported device id\n");
+ }
+
+ /* enable flow control to be programmed */
+ hw->fc.send_xon = 1;
+
+ set_bit(__IXGB_DOWN, &adapter->flags);
+ return 0;
+}
+
+/**
+ * ixgb_open - Called when a network interface is made active
+ * @netdev: network interface device structure
+ *
+ * Returns 0 on success, negative value on failure
+ *
+ * The open entry point is called when a network interface is made
+ * active by the system (IFF_UP). At this point all resources needed
+ * for transmit and receive operations are allocated, the interrupt
+ * handler is registered with the OS, the watchdog timer is started,
+ * and the stack is notified that the interface is ready.
+ **/
+
+static int
+ixgb_open(struct net_device *netdev)
+{
+ struct ixgb_adapter *adapter = netdev_priv(netdev);
+ int err;
+
+ /* allocate transmit descriptors */
+ err = ixgb_setup_tx_resources(adapter);
+ if (err)
+ goto err_setup_tx;
+
+ netif_carrier_off(netdev);
+
+ /* allocate receive descriptors */
+
+ err = ixgb_setup_rx_resources(adapter);
+ if (err)
+ goto err_setup_rx;
+
+ err = ixgb_up(adapter);
+ if (err)
+ goto err_up;
+
+ netif_start_queue(netdev);
+
+ return 0;
+
+err_up:
+ ixgb_free_rx_resources(adapter);
+err_setup_rx:
+ ixgb_free_tx_resources(adapter);
+err_setup_tx:
+ ixgb_reset(adapter);
+
+ return err;
+}
+
+/**
+ * ixgb_close - Disables a network interface
+ * @netdev: network interface device structure
+ *
+ * Returns 0, this is not allowed to fail
+ *
+ * The close entry point is called when an interface is de-activated
+ * by the OS. The hardware is still under the drivers control, but
+ * needs to be disabled. A global MAC reset is issued to stop the
+ * hardware, and all transmit and receive resources are freed.
+ **/
+
+static int
+ixgb_close(struct net_device *netdev)
+{
+ struct ixgb_adapter *adapter = netdev_priv(netdev);
+
+ ixgb_down(adapter, true);
+
+ ixgb_free_tx_resources(adapter);
+ ixgb_free_rx_resources(adapter);
+
+ return 0;
+}
+
+/**
+ * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
+ * @adapter: board private structure
+ *
+ * Return 0 on success, negative on failure
+ **/
+
+int
+ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
+{
+ struct ixgb_desc_ring *txdr = &adapter->tx_ring;
+ struct pci_dev *pdev = adapter->pdev;
+ int size;
+
+ size = sizeof(struct ixgb_buffer) * txdr->count;
+ txdr->buffer_info = vzalloc(size);
+ if (!txdr->buffer_info) {
+ netif_err(adapter, probe, adapter->netdev,
+ "Unable to allocate transmit descriptor ring memory\n");
+ return -ENOMEM;
+ }
+
+ /* round up to nearest 4K */
+
+ txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
+ txdr->size = ALIGN(txdr->size, 4096);
+
+ txdr->desc = dma_alloc_coherent(&pdev->dev, txdr->size, &txdr->dma,
+ GFP_KERNEL);
+ if (!txdr->desc) {
+ vfree(txdr->buffer_info);
+ netif_err(adapter, probe, adapter->netdev,
+ "Unable to allocate transmit descriptor memory\n");
+ return -ENOMEM;
+ }
+ memset(txdr->desc, 0, txdr->size);
+
+ txdr->next_to_use = 0;
+ txdr->next_to_clean = 0;
+
+ return 0;
+}
+
+/**
+ * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
+ * @adapter: board private structure
+ *
+ * Configure the Tx unit of the MAC after a reset.
+ **/
+
+static void
+ixgb_configure_tx(struct ixgb_adapter *adapter)
+{
+ u64 tdba = adapter->tx_ring.dma;
+ u32 tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
+ u32 tctl;
+ struct ixgb_hw *hw = &adapter->hw;
+
+ /* Setup the Base and Length of the Tx Descriptor Ring
+ * tx_ring.dma can be either a 32 or 64 bit value
+ */
+
+ IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
+ IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
+
+ IXGB_WRITE_REG(hw, TDLEN, tdlen);
+
+ /* Setup the HW Tx Head and Tail descriptor pointers */
+
+ IXGB_WRITE_REG(hw, TDH, 0);
+ IXGB_WRITE_REG(hw, TDT, 0);
+
+ /* don't set up txdctl, it induces performance problems if configured
+ * incorrectly */
+ /* Set the Tx Interrupt Delay register */
+
+ IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
+
+ /* Program the Transmit Control Register */
+
+ tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
+ IXGB_WRITE_REG(hw, TCTL, tctl);
+
+ /* Setup Transmit Descriptor Settings for this adapter */
+ adapter->tx_cmd_type =
+ IXGB_TX_DESC_TYPE |
+ (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
+}
+
+/**
+ * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
+ * @adapter: board private structure
+ *
+ * Returns 0 on success, negative on failure
+ **/
+
+int
+ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
+{
+ struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
+ struct pci_dev *pdev = adapter->pdev;
+ int size;
+
+ size = sizeof(struct ixgb_buffer) * rxdr->count;
+ rxdr->buffer_info = vzalloc(size);
+ if (!rxdr->buffer_info) {
+ netif_err(adapter, probe, adapter->netdev,
+ "Unable to allocate receive descriptor ring\n");
+ return -ENOMEM;
+ }
+
+ /* Round up to nearest 4K */
+
+ rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
+ rxdr->size = ALIGN(rxdr->size, 4096);
+
+ rxdr->desc = dma_alloc_coherent(&pdev->dev, rxdr->size, &rxdr->dma,
+ GFP_KERNEL);
+
+ if (!rxdr->desc) {
+ vfree(rxdr->buffer_info);
+ netif_err(adapter, probe, adapter->netdev,
+ "Unable to allocate receive descriptors\n");
+ return -ENOMEM;
+ }
+ memset(rxdr->desc, 0, rxdr->size);
+
+ rxdr->next_to_clean = 0;
+ rxdr->next_to_use = 0;
+
+ return 0;
+}
+
+/**
+ * ixgb_setup_rctl - configure the receive control register
+ * @adapter: Board private structure
+ **/
+
+static void
+ixgb_setup_rctl(struct ixgb_adapter *adapter)
+{
+ u32 rctl;
+
+ rctl = IXGB_READ_REG(&adapter->hw, RCTL);
+
+ rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
+
+ rctl |=
+ IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
+ IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
+ (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
+
+ rctl |= IXGB_RCTL_SECRC;
+
+ if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048)
+ rctl |= IXGB_RCTL_BSIZE_2048;
+ else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096)
+ rctl |= IXGB_RCTL_BSIZE_4096;
+ else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192)
+ rctl |= IXGB_RCTL_BSIZE_8192;
+ else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384)
+ rctl |= IXGB_RCTL_BSIZE_16384;
+
+ IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
+}
+
+/**
+ * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
+ * @adapter: board private structure
+ *
+ * Configure the Rx unit of the MAC after a reset.
+ **/
+
+static void
+ixgb_configure_rx(struct ixgb_adapter *adapter)
+{
+ u64 rdba = adapter->rx_ring.dma;
+ u32 rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
+ struct ixgb_hw *hw = &adapter->hw;
+ u32 rctl;
+ u32 rxcsum;
+
+ /* make sure receives are disabled while setting up the descriptors */
+
+ rctl = IXGB_READ_REG(hw, RCTL);
+ IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
+
+ /* set the Receive Delay Timer Register */
+
+ IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
+
+ /* Setup the Base and Length of the Rx Descriptor Ring */
+
+ IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
+ IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
+
+ IXGB_WRITE_REG(hw, RDLEN, rdlen);
+
+ /* Setup the HW Rx Head and Tail Descriptor Pointers */
+ IXGB_WRITE_REG(hw, RDH, 0);
+ IXGB_WRITE_REG(hw, RDT, 0);
+
+ /* due to the hardware errata with RXDCTL, we are unable to use any of
+ * the performance enhancing features of it without causing other
+ * subtle bugs, some of the bugs could include receive length
+ * corruption at high data rates (WTHRESH > 0) and/or receive
+ * descriptor ring irregularites (particularly in hardware cache) */
+ IXGB_WRITE_REG(hw, RXDCTL, 0);
+
+ /* Enable Receive Checksum Offload for TCP and UDP */
+ if (adapter->rx_csum) {
+ rxcsum = IXGB_READ_REG(hw, RXCSUM);
+ rxcsum |= IXGB_RXCSUM_TUOFL;
+ IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
+ }
+
+ /* Enable Receives */
+
+ IXGB_WRITE_REG(hw, RCTL, rctl);
+}
+
+/**
+ * ixgb_free_tx_resources - Free Tx Resources
+ * @adapter: board private structure
+ *
+ * Free all transmit software resources
+ **/
+
+void
+ixgb_free_tx_resources(struct ixgb_adapter *adapter)
+{
+ struct pci_dev *pdev = adapter->pdev;
+
+ ixgb_clean_tx_ring(adapter);
+
+ vfree(adapter->tx_ring.buffer_info);
+ adapter->tx_ring.buffer_info = NULL;
+
+ dma_free_coherent(&pdev->dev, adapter->tx_ring.size,
+ adapter->tx_ring.desc, adapter->tx_ring.dma);
+
+ adapter->tx_ring.desc = NULL;
+}
+
+static void
+ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
+ struct ixgb_buffer *buffer_info)
+{
+ if (buffer_info->dma) {
+ if (buffer_info->mapped_as_page)
+ dma_unmap_page(&adapter->pdev->dev, buffer_info->dma,
+ buffer_info->length, DMA_TO_DEVICE);
+ else
+ dma_unmap_single(&adapter->pdev->dev, buffer_info->dma,
+ buffer_info->length, DMA_TO_DEVICE);
+ buffer_info->dma = 0;
+ }
+
+ if (buffer_info->skb) {
+ dev_kfree_skb_any(buffer_info->skb);
+ buffer_info->skb = NULL;
+ }
+ buffer_info->time_stamp = 0;
+ /* these fields must always be initialized in tx
+ * buffer_info->length = 0;
+ * buffer_info->next_to_watch = 0; */
+}
+
+/**
+ * ixgb_clean_tx_ring - Free Tx Buffers
+ * @adapter: board private structure
+ **/
+
+static void
+ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
+{
+ struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
+ struct ixgb_buffer *buffer_info;
+ unsigned long size;
+ unsigned int i;
+
+ /* Free all the Tx ring sk_buffs */
+
+ for (i = 0; i < tx_ring->count; i++) {
+ buffer_info = &tx_ring->buffer_info[i];
+ ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
+ }
+
+ size = sizeof(struct ixgb_buffer) * tx_ring->count;
+ memset(tx_ring->buffer_info, 0, size);
+
+ /* Zero out the descriptor ring */
+
+ memset(tx_ring->desc, 0, tx_ring->size);
+
+ tx_ring->next_to_use = 0;
+ tx_ring->next_to_clean = 0;
+
+ IXGB_WRITE_REG(&adapter->hw, TDH, 0);
+ IXGB_WRITE_REG(&adapter->hw, TDT, 0);
+}
+
+/**
+ * ixgb_free_rx_resources - Free Rx Resources
+ * @adapter: board private structure
+ *
+ * Free all receive software resources
+ **/
+
+void
+ixgb_free_rx_resources(struct ixgb_adapter *adapter)
+{
+ struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
+ struct pci_dev *pdev = adapter->pdev;
+
+ ixgb_clean_rx_ring(adapter);
+
+ vfree(rx_ring->buffer_info);
+ rx_ring->buffer_info = NULL;
+
+ dma_free_coherent(&pdev->dev, rx_ring->size, rx_ring->desc,
+ rx_ring->dma);
+
+ rx_ring->desc = NULL;
+}
+
+/**
+ * ixgb_clean_rx_ring - Free Rx Buffers
+ * @adapter: board private structure
+ **/
+
+static void
+ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
+{
+ struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
+ struct ixgb_buffer *buffer_info;
+ struct pci_dev *pdev = adapter->pdev;
+ unsigned long size;
+ unsigned int i;
+
+ /* Free all the Rx ring sk_buffs */
+
+ for (i = 0; i < rx_ring->count; i++) {
+ buffer_info = &rx_ring->buffer_info[i];
+ if (buffer_info->dma) {
+ dma_unmap_single(&pdev->dev,
+ buffer_info->dma,
+ buffer_info->length,
+ DMA_FROM_DEVICE);
+ buffer_info->dma = 0;
+ buffer_info->length = 0;
+ }
+
+ if (buffer_info->skb) {
+ dev_kfree_skb(buffer_info->skb);
+ buffer_info->skb = NULL;
+ }
+ }
+
+ size = sizeof(struct ixgb_buffer) * rx_ring->count;
+ memset(rx_ring->buffer_info, 0, size);
+
+ /* Zero out the descriptor ring */
+
+ memset(rx_ring->desc, 0, rx_ring->size);
+
+ rx_ring->next_to_clean = 0;
+ rx_ring->next_to_use = 0;
+
+ IXGB_WRITE_REG(&adapter->hw, RDH, 0);
+ IXGB_WRITE_REG(&adapter->hw, RDT, 0);
+}
+
+/**
+ * ixgb_set_mac - Change the Ethernet Address of the NIC
+ * @netdev: network interface device structure
+ * @p: pointer to an address structure
+ *
+ * Returns 0 on success, negative on failure
+ **/
+
+static int
+ixgb_set_mac(struct net_device *netdev, void *p)
+{
+ struct ixgb_adapter *adapter = netdev_priv(netdev);
+ struct sockaddr *addr = p;
+
+ if (!is_valid_ether_addr(addr->sa_data))
+ return -EADDRNOTAVAIL;
+
+ memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
+
+ ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
+
+ return 0;
+}
+
+/**
+ * ixgb_set_multi - Multicast and Promiscuous mode set
+ * @netdev: network interface device structure
+ *
+ * The set_multi entry point is called whenever the multicast address
+ * list or the network interface flags are updated. This routine is
+ * responsible for configuring the hardware for proper multicast,
+ * promiscuous mode, and all-multi behavior.
+ **/
+
+static void
+ixgb_set_multi(struct net_device *netdev)
+{
+ struct ixgb_adapter *adapter = netdev_priv(netdev);
+ struct ixgb_hw *hw = &adapter->hw;
+ struct netdev_hw_addr *ha;
+ u32 rctl;
+ int i;
+
+ /* Check for Promiscuous and All Multicast modes */
+
+ rctl = IXGB_READ_REG(hw, RCTL);
+
+ if (netdev->flags & IFF_PROMISC) {
+ rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
+ /* disable VLAN filtering */
+ rctl &= ~IXGB_RCTL_CFIEN;
+ rctl &= ~IXGB_RCTL_VFE;
+ } else {
+ if (netdev->flags & IFF_ALLMULTI) {
+ rctl |= IXGB_RCTL_MPE;
+ rctl &= ~IXGB_RCTL_UPE;
+ } else {
+ rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
+ }
+ /* enable VLAN filtering */
+ rctl |= IXGB_RCTL_VFE;
+ rctl &= ~IXGB_RCTL_CFIEN;
+ }
+
+ if (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
+ rctl |= IXGB_RCTL_MPE;
+ IXGB_WRITE_REG(hw, RCTL, rctl);
+ } else {
+ u8 mta[IXGB_MAX_NUM_MULTICAST_ADDRESSES *
+ IXGB_ETH_LENGTH_OF_ADDRESS];
+
+ IXGB_WRITE_REG(hw, RCTL, rctl);
+
+ i = 0;
+ netdev_for_each_mc_addr(ha, netdev)
+ memcpy(&mta[i++ * IXGB_ETH_LENGTH_OF_ADDRESS],
+ ha->addr, IXGB_ETH_LENGTH_OF_ADDRESS);
+
+ ixgb_mc_addr_list_update(hw, mta, netdev_mc_count(netdev), 0);
+ }
+
+ if (netdev->features & NETIF_F_HW_VLAN_RX)
+ ixgb_vlan_strip_enable(adapter);
+ else
+ ixgb_vlan_strip_disable(adapter);
+
+}
+
+/**
+ * ixgb_watchdog - Timer Call-back
+ * @data: pointer to netdev cast into an unsigned long
+ **/
+
+static void
+ixgb_watchdog(unsigned long data)
+{
+ struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
+ struct net_device *netdev = adapter->netdev;
+ struct ixgb_desc_ring *txdr = &adapter->tx_ring;
+
+ ixgb_check_for_link(&adapter->hw);
+
+ if (ixgb_check_for_bad_link(&adapter->hw)) {
+ /* force the reset path */
+ netif_stop_queue(netdev);
+ }
+
+ if (adapter->hw.link_up) {
+ if (!netif_carrier_ok(netdev)) {
+ netdev_info(netdev,
+ "NIC Link is Up 10 Gbps Full Duplex, Flow Control: %s\n",
+ (adapter->hw.fc.type == ixgb_fc_full) ?
+ "RX/TX" :
+ (adapter->hw.fc.type == ixgb_fc_rx_pause) ?
+ "RX" :
+ (adapter->hw.fc.type == ixgb_fc_tx_pause) ?
+ "TX" : "None");
+ adapter->link_speed = 10000;
+ adapter->link_duplex = FULL_DUPLEX;
+ netif_carrier_on(netdev);
+ }
+ } else {
+ if (netif_carrier_ok(netdev)) {
+ adapter->link_speed = 0;
+ adapter->link_duplex = 0;
+ netdev_info(netdev, "NIC Link is Down\n");
+ netif_carrier_off(netdev);
+ }
+ }
+
+ ixgb_update_stats(adapter);
+
+ if (!netif_carrier_ok(netdev)) {
+ if (IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
+ /* We've lost link, so the controller stops DMA,
+ * but we've got queued Tx work that's never going
+ * to get done, so reset controller to flush Tx.
+ * (Do the reset outside of interrupt context). */
+ schedule_work(&adapter->tx_timeout_task);
+ /* return immediately since reset is imminent */
+ return;
+ }
+ }
+
+ /* Force detection of hung controller every watchdog period */
+ adapter->detect_tx_hung = true;
+
+ /* generate an interrupt to force clean up of any stragglers */
+ IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
+
+ /* Reset the timer */
+ mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
+}
+
+#define IXGB_TX_FLAGS_CSUM 0x00000001
+#define IXGB_TX_FLAGS_VLAN 0x00000002
+#define IXGB_TX_FLAGS_TSO 0x00000004
+
+static int
+ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
+{
+ struct ixgb_context_desc *context_desc;
+ unsigned int i;
+ u8 ipcss, ipcso, tucss, tucso, hdr_len;
+ u16 ipcse, tucse, mss;
+ int err;
+
+ if (likely(skb_is_gso(skb))) {
+ struct ixgb_buffer *buffer_info;
+ struct iphdr *iph;
+
+ if (skb_header_cloned(skb)) {
+ err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
+ if (err)
+ return err;
+ }
+
+ hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
+ mss = skb_shinfo(skb)->gso_size;
+ iph = ip_hdr(skb);
+ iph->tot_len = 0;
+ iph->check = 0;
+ tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
+ iph->daddr, 0,
+ IPPROTO_TCP, 0);
+ ipcss = skb_network_offset(skb);
+ ipcso = (void *)&(iph->check) - (void *)skb->data;
+ ipcse = skb_transport_offset(skb) - 1;
+ tucss = skb_transport_offset(skb);
+ tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data;
+ tucse = 0;
+
+ i = adapter->tx_ring.next_to_use;
+ context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
+ buffer_info = &adapter->tx_ring.buffer_info[i];
+ WARN_ON(buffer_info->dma != 0);
+
+ context_desc->ipcss = ipcss;
+ context_desc->ipcso = ipcso;
+ context_desc->ipcse = cpu_to_le16(ipcse);
+ context_desc->tucss = tucss;
+ context_desc->tucso = tucso;
+ context_desc->tucse = cpu_to_le16(tucse);
+ context_desc->mss = cpu_to_le16(mss);
+ context_desc->hdr_len = hdr_len;
+ context_desc->status = 0;
+ context_desc->cmd_type_len = cpu_to_le32(
+ IXGB_CONTEXT_DESC_TYPE
+ | IXGB_CONTEXT_DESC_CMD_TSE
+ | IXGB_CONTEXT_DESC_CMD_IP
+ | IXGB_CONTEXT_DESC_CMD_TCP
+ | IXGB_CONTEXT_DESC_CMD_IDE
+ | (skb->len - (hdr_len)));
+
+
+ if (++i == adapter->tx_ring.count) i = 0;
+ adapter->tx_ring.next_to_use = i;
+
+ return 1;
+ }
+
+ return 0;
+}
+
+static bool
+ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
+{
+ struct ixgb_context_desc *context_desc;
+ unsigned int i;
+ u8 css, cso;
+
+ if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
+ struct ixgb_buffer *buffer_info;
+ css = skb_checksum_start_offset(skb);
+ cso = css + skb->csum_offset;
+
+ i = adapter->tx_ring.next_to_use;
+ context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
+ buffer_info = &adapter->tx_ring.buffer_info[i];
+ WARN_ON(buffer_info->dma != 0);
+
+ context_desc->tucss = css;
+ context_desc->tucso = cso;
+ context_desc->tucse = 0;
+ /* zero out any previously existing data in one instruction */
+ *(u32 *)&(context_desc->ipcss) = 0;
+ context_desc->status = 0;
+ context_desc->hdr_len = 0;
+ context_desc->mss = 0;
+ context_desc->cmd_type_len =
+ cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
+ | IXGB_TX_DESC_CMD_IDE);
+
+ if (++i == adapter->tx_ring.count) i = 0;
+ adapter->tx_ring.next_to_use = i;
+
+ return true;
+ }
+
+ return false;
+}
+
+#define IXGB_MAX_TXD_PWR 14
+#define IXGB_MAX_DATA_PER_TXD (1<<IXGB_MAX_TXD_PWR)
+
+static int
+ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
+ unsigned int first)
+{
+ struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
+ struct pci_dev *pdev = adapter->pdev;
+ struct ixgb_buffer *buffer_info;
+ int len = skb_headlen(skb);
+ unsigned int offset = 0, size, count = 0, i;
+ unsigned int mss = skb_shinfo(skb)->gso_size;
+ unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
+ unsigned int f;
+
+ i = tx_ring->next_to_use;
+
+ while (len) {
+ buffer_info = &tx_ring->buffer_info[i];
+ size = min(len, IXGB_MAX_DATA_PER_TXD);
+ /* Workaround for premature desc write-backs
+ * in TSO mode. Append 4-byte sentinel desc */
+ if (unlikely(mss && !nr_frags && size == len && size > 8))
+ size -= 4;
+
+ buffer_info->length = size;
+ WARN_ON(buffer_info->dma != 0);
+ buffer_info->time_stamp = jiffies;
+ buffer_info->mapped_as_page = false;
+ buffer_info->dma = dma_map_single(&pdev->dev,
+ skb->data + offset,
+ size, DMA_TO_DEVICE);
+ if (dma_mapping_error(&pdev->dev, buffer_info->dma))
+ goto dma_error;
+ buffer_info->next_to_watch = 0;
+
+ len -= size;
+ offset += size;
+ count++;
+ if (len) {
+ i++;
+ if (i == tx_ring->count)
+ i = 0;
+ }
+ }
+
+ for (f = 0; f < nr_frags; f++) {
+ struct skb_frag_struct *frag;
+
+ frag = &skb_shinfo(skb)->frags[f];
+ len = frag->size;
+ offset = frag->page_offset;
+
+ while (len) {
+ i++;
+ if (i == tx_ring->count)
+ i = 0;
+
+ buffer_info = &tx_ring->buffer_info[i];
+ size = min(len, IXGB_MAX_DATA_PER_TXD);
+
+ /* Workaround for premature desc write-backs
+ * in TSO mode. Append 4-byte sentinel desc */
+ if (unlikely(mss && (f == (nr_frags - 1))
+ && size == len && size > 8))
+ size -= 4;
+
+ buffer_info->length = size;
+ buffer_info->time_stamp = jiffies;
+ buffer_info->mapped_as_page = true;
+ buffer_info->dma =
+ dma_map_page(&pdev->dev, frag->page,
+ offset, size, DMA_TO_DEVICE);
+ if (dma_mapping_error(&pdev->dev, buffer_info->dma))
+ goto dma_error;
+ buffer_info->next_to_watch = 0;
+
+ len -= size;
+ offset += size;
+ count++;
+ }
+ }
+ tx_ring->buffer_info[i].skb = skb;
+ tx_ring->buffer_info[first].next_to_watch = i;
+
+ return count;
+
+dma_error:
+ dev_err(&pdev->dev, "TX DMA map failed\n");
+ buffer_info->dma = 0;
+ if (count)
+ count--;
+
+ while (count--) {
+ if (i==0)
+ i += tx_ring->count;
+ i--;
+ buffer_info = &tx_ring->buffer_info[i];
+ ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
+ }
+
+ return 0;
+}
+
+static void
+ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
+{
+ struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
+ struct ixgb_tx_desc *tx_desc = NULL;
+ struct ixgb_buffer *buffer_info;
+ u32 cmd_type_len = adapter->tx_cmd_type;
+ u8 status = 0;
+ u8 popts = 0;
+ unsigned int i;
+
+ if (tx_flags & IXGB_TX_FLAGS_TSO) {
+ cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
+ popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
+ }
+
+ if (tx_flags & IXGB_TX_FLAGS_CSUM)
+ popts |= IXGB_TX_DESC_POPTS_TXSM;
+
+ if (tx_flags & IXGB_TX_FLAGS_VLAN)
+ cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
+
+ i = tx_ring->next_to_use;
+
+ while (count--) {
+ buffer_info = &tx_ring->buffer_info[i];
+ tx_desc = IXGB_TX_DESC(*tx_ring, i);
+ tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
+ tx_desc->cmd_type_len =
+ cpu_to_le32(cmd_type_len | buffer_info->length);
+ tx_desc->status = status;
+ tx_desc->popts = popts;
+ tx_desc->vlan = cpu_to_le16(vlan_id);
+
+ if (++i == tx_ring->count) i = 0;
+ }
+
+ tx_desc->cmd_type_len |=
+ cpu_to_le32(IXGB_TX_DESC_CMD_EOP | IXGB_TX_DESC_CMD_RS);
+
+ /* Force memory writes to complete before letting h/w
+ * know there are new descriptors to fetch. (Only
+ * applicable for weak-ordered memory model archs,
+ * such as IA-64). */
+ wmb();
+
+ tx_ring->next_to_use = i;
+ IXGB_WRITE_REG(&adapter->hw, TDT, i);
+}
+
+static int __ixgb_maybe_stop_tx(struct net_device *netdev, int size)
+{
+ struct ixgb_adapter *adapter = netdev_priv(netdev);
+ struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
+
+ netif_stop_queue(netdev);
+ /* Herbert's original patch had:
+ * smp_mb__after_netif_stop_queue();
+ * but since that doesn't exist yet, just open code it. */
+ smp_mb();
+
+ /* We need to check again in a case another CPU has just
+ * made room available. */
+ if (likely(IXGB_DESC_UNUSED(tx_ring) < size))
+ return -EBUSY;
+
+ /* A reprieve! */
+ netif_start_queue(netdev);
+ ++adapter->restart_queue;
+ return 0;
+}
+
+static int ixgb_maybe_stop_tx(struct net_device *netdev,
+ struct ixgb_desc_ring *tx_ring, int size)
+{
+ if (likely(IXGB_DESC_UNUSED(tx_ring) >= size))
+ return 0;
+ return __ixgb_maybe_stop_tx(netdev, size);
+}
+
+
+/* Tx Descriptors needed, worst case */
+#define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
+ (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
+#define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) /* skb->date */ + \
+ MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 /* for context */ \
+ + 1 /* one more needed for sentinel TSO workaround */
+
+static netdev_tx_t
+ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
+{
+ struct ixgb_adapter *adapter = netdev_priv(netdev);
+ unsigned int first;
+ unsigned int tx_flags = 0;
+ int vlan_id = 0;
+ int count = 0;
+ int tso;
+
+ if (test_bit(__IXGB_DOWN, &adapter->flags)) {
+ dev_kfree_skb(skb);
+ return NETDEV_TX_OK;
+ }
+
+ if (skb->len <= 0) {
+ dev_kfree_skb(skb);
+ return NETDEV_TX_OK;
+ }
+
+ if (unlikely(ixgb_maybe_stop_tx(netdev, &adapter->tx_ring,
+ DESC_NEEDED)))
+ return NETDEV_TX_BUSY;
+
+ if (vlan_tx_tag_present(skb)) {
+ tx_flags |= IXGB_TX_FLAGS_VLAN;
+ vlan_id = vlan_tx_tag_get(skb);
+ }
+
+ first = adapter->tx_ring.next_to_use;
+
+ tso = ixgb_tso(adapter, skb);
+ if (tso < 0) {
+ dev_kfree_skb(skb);
+ return NETDEV_TX_OK;
+ }
+
+ if (likely(tso))
+ tx_flags |= IXGB_TX_FLAGS_TSO;
+ else if (ixgb_tx_csum(adapter, skb))
+ tx_flags |= IXGB_TX_FLAGS_CSUM;
+
+ count = ixgb_tx_map(adapter, skb, first);
+
+ if (count) {
+ ixgb_tx_queue(adapter, count, vlan_id, tx_flags);
+ /* Make sure there is space in the ring for the next send. */
+ ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED);
+
+ } else {
+ dev_kfree_skb_any(skb);
+ adapter->tx_ring.buffer_info[first].time_stamp = 0;
+ adapter->tx_ring.next_to_use = first;
+ }
+
+ return NETDEV_TX_OK;
+}
+
+/**
+ * ixgb_tx_timeout - Respond to a Tx Hang
+ * @netdev: network interface device structure
+ **/
+
+static void
+ixgb_tx_timeout(struct net_device *netdev)
+{
+ struct ixgb_adapter *adapter = netdev_priv(netdev);
+
+ /* Do the reset outside of interrupt context */
+ schedule_work(&adapter->tx_timeout_task);
+}
+
+static void
+ixgb_tx_timeout_task(struct work_struct *work)
+{
+ struct ixgb_adapter *adapter =
+ container_of(work, struct ixgb_adapter, tx_timeout_task);
+
+ adapter->tx_timeout_count++;
+ ixgb_down(adapter, true);
+ ixgb_up(adapter);
+}
+
+/**
+ * ixgb_get_stats - Get System Network Statistics
+ * @netdev: network interface device structure
+ *
+ * Returns the address of the device statistics structure.
+ * The statistics are actually updated from the timer callback.
+ **/
+
+static struct net_device_stats *
+ixgb_get_stats(struct net_device *netdev)
+{
+ return &netdev->stats;
+}
+
+/**
+ * ixgb_change_mtu - Change the Maximum Transfer Unit
+ * @netdev: network interface device structure
+ * @new_mtu: new value for maximum frame size
+ *
+ * Returns 0 on success, negative on failure
+ **/
+
+static int
+ixgb_change_mtu(struct net_device *netdev, int new_mtu)
+{
+ struct ixgb_adapter *adapter = netdev_priv(netdev);
+ int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
+ int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
+
+ /* MTU < 68 is an error for IPv4 traffic, just don't allow it */
+ if ((new_mtu < 68) ||
+ (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
+ netif_err(adapter, probe, adapter->netdev,
+ "Invalid MTU setting %d\n", new_mtu);
+ return -EINVAL;
+ }
+
+ if (old_max_frame == max_frame)
+ return 0;
+
+ if (netif_running(netdev))
+ ixgb_down(adapter, true);
+
+ adapter->rx_buffer_len = max_frame + 8; /* + 8 for errata */
+
+ netdev->mtu = new_mtu;
+
+ if (netif_running(netdev))
+ ixgb_up(adapter);
+
+ return 0;
+}
+
+/**
+ * ixgb_update_stats - Update the board statistics counters.
+ * @adapter: board private structure
+ **/
+
+void
+ixgb_update_stats(struct ixgb_adapter *adapter)
+{
+ struct net_device *netdev = adapter->netdev;
+ struct pci_dev *pdev = adapter->pdev;
+
+ /* Prevent stats update while adapter is being reset */
+ if (pci_channel_offline(pdev))
+ return;
+
+ if ((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
+ (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
+ u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
+ u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
+ u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
+ u64 bcast = ((u64)bcast_h << 32) | bcast_l;
+
+ multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
+ /* fix up multicast stats by removing broadcasts */
+ if (multi >= bcast)
+ multi -= bcast;
+
+ adapter->stats.mprcl += (multi & 0xFFFFFFFF);
+ adapter->stats.mprch += (multi >> 32);
+ adapter->stats.bprcl += bcast_l;
+ adapter->stats.bprch += bcast_h;
+ } else {
+ adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
+ adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
+ adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
+ adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
+ }
+ adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
+ adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
+ adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
+ adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
+ adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
+ adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
+ adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
+ adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
+ adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
+ adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
+ adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
+ adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
+ adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
+ adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
+ adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
+ adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
+ adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
+ adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
+ adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
+ adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
+ adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
+ adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
+ adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
+ adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
+ adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
+ adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
+ adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
+ adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
+ adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
+ adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
+ adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
+ adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
+ adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
+ adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
+ adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
+ adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
+ adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
+ adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
+ adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
+ adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
+ adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
+ adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
+ adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
+ adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
+ adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
+ adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
+ adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
+ adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
+ adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
+ adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
+ adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
+ adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
+ adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
+ adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
+ adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
+ adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
+
+ /* Fill out the OS statistics structure */
+
+ netdev->stats.rx_packets = adapter->stats.gprcl;
+ netdev->stats.tx_packets = adapter->stats.gptcl;
+ netdev->stats.rx_bytes = adapter->stats.gorcl;
+ netdev->stats.tx_bytes = adapter->stats.gotcl;
+ netdev->stats.multicast = adapter->stats.mprcl;
+ netdev->stats.collisions = 0;
+
+ /* ignore RLEC as it reports errors for padded (<64bytes) frames
+ * with a length in the type/len field */
+ netdev->stats.rx_errors =
+ /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
+ adapter->stats.ruc +
+ adapter->stats.roc /*+ adapter->stats.rlec */ +
+ adapter->stats.icbc +
+ adapter->stats.ecbc + adapter->stats.mpc;
+
+ /* see above
+ * netdev->stats.rx_length_errors = adapter->stats.rlec;
+ */
+
+ netdev->stats.rx_crc_errors = adapter->stats.crcerrs;
+ netdev->stats.rx_fifo_errors = adapter->stats.mpc;
+ netdev->stats.rx_missed_errors = adapter->stats.mpc;
+ netdev->stats.rx_over_errors = adapter->stats.mpc;
+
+ netdev->stats.tx_errors = 0;
+ netdev->stats.rx_frame_errors = 0;
+ netdev->stats.tx_aborted_errors = 0;
+ netdev->stats.tx_carrier_errors = 0;
+ netdev->stats.tx_fifo_errors = 0;
+ netdev->stats.tx_heartbeat_errors = 0;
+ netdev->stats.tx_window_errors = 0;
+}
+
+#define IXGB_MAX_INTR 10
+/**
+ * ixgb_intr - Interrupt Handler
+ * @irq: interrupt number
+ * @data: pointer to a network interface device structure
+ **/
+
+static irqreturn_t
+ixgb_intr(int irq, void *data)
+{
+ struct net_device *netdev = data;
+ struct ixgb_adapter *adapter = netdev_priv(netdev);
+ struct ixgb_hw *hw = &adapter->hw;
+ u32 icr = IXGB_READ_REG(hw, ICR);
+
+ if (unlikely(!icr))
+ return IRQ_NONE; /* Not our interrupt */
+
+ if (unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC)))
+ if (!test_bit(__IXGB_DOWN, &adapter->flags))
+ mod_timer(&adapter->watchdog_timer, jiffies);
+
+ if (napi_schedule_prep(&adapter->napi)) {
+
+ /* Disable interrupts and register for poll. The flush
+ of the posted write is intentionally left out.
+ */
+
+ IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
+ __napi_schedule(&adapter->napi);
+ }
+ return IRQ_HANDLED;
+}
+
+/**
+ * ixgb_clean - NAPI Rx polling callback
+ * @adapter: board private structure
+ **/
+
+static int
+ixgb_clean(struct napi_struct *napi, int budget)
+{
+ struct ixgb_adapter *adapter = container_of(napi, struct ixgb_adapter, napi);
+ int work_done = 0;
+
+ ixgb_clean_tx_irq(adapter);
+ ixgb_clean_rx_irq(adapter, &work_done, budget);
+
+ /* If budget not fully consumed, exit the polling mode */
+ if (work_done < budget) {
+ napi_complete(napi);
+ if (!test_bit(__IXGB_DOWN, &adapter->flags))
+ ixgb_irq_enable(adapter);
+ }
+
+ return work_done;
+}
+
+/**
+ * ixgb_clean_tx_irq - Reclaim resources after transmit completes
+ * @adapter: board private structure
+ **/
+
+static bool
+ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
+{
+ struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
+ struct net_device *netdev = adapter->netdev;
+ struct ixgb_tx_desc *tx_desc, *eop_desc;
+ struct ixgb_buffer *buffer_info;
+ unsigned int i, eop;
+ bool cleaned = false;
+
+ i = tx_ring->next_to_clean;
+ eop = tx_ring->buffer_info[i].next_to_watch;
+ eop_desc = IXGB_TX_DESC(*tx_ring, eop);
+
+ while (eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
+
+ rmb(); /* read buffer_info after eop_desc */
+ for (cleaned = false; !cleaned; ) {
+ tx_desc = IXGB_TX_DESC(*tx_ring, i);
+ buffer_info = &tx_ring->buffer_info[i];
+
+ if (tx_desc->popts &
+ (IXGB_TX_DESC_POPTS_TXSM |
+ IXGB_TX_DESC_POPTS_IXSM))
+ adapter->hw_csum_tx_good++;
+
+ ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
+
+ *(u32 *)&(tx_desc->status) = 0;
+
+ cleaned = (i == eop);
+ if (++i == tx_ring->count) i = 0;
+ }
+
+ eop = tx_ring->buffer_info[i].next_to_watch;
+ eop_desc = IXGB_TX_DESC(*tx_ring, eop);
+ }
+
+ tx_ring->next_to_clean = i;
+
+ if (unlikely(cleaned && netif_carrier_ok(netdev) &&
+ IXGB_DESC_UNUSED(tx_ring) >= DESC_NEEDED)) {
+ /* Make sure that anybody stopping the queue after this
+ * sees the new next_to_clean. */
+ smp_mb();
+
+ if (netif_queue_stopped(netdev) &&
+ !(test_bit(__IXGB_DOWN, &adapter->flags))) {
+ netif_wake_queue(netdev);
+ ++adapter->restart_queue;
+ }
+ }
+
+ if (adapter->detect_tx_hung) {
+ /* detect a transmit hang in hardware, this serializes the
+ * check with the clearing of time_stamp and movement of i */
+ adapter->detect_tx_hung = false;
+ if (tx_ring->buffer_info[eop].time_stamp &&
+ time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ)
+ && !(IXGB_READ_REG(&adapter->hw, STATUS) &
+ IXGB_STATUS_TXOFF)) {
+ /* detected Tx unit hang */
+ netif_err(adapter, drv, adapter->netdev,
+ "Detected Tx Unit Hang\n"
+ " TDH <%x>\n"
+ " TDT <%x>\n"
+ " next_to_use <%x>\n"
+ " next_to_clean <%x>\n"
+ "buffer_info[next_to_clean]\n"
+ " time_stamp <%lx>\n"
+ " next_to_watch <%x>\n"
+ " jiffies <%lx>\n"
+ " next_to_watch.status <%x>\n",
+ IXGB_READ_REG(&adapter->hw, TDH),
+ IXGB_READ_REG(&adapter->hw, TDT),
+ tx_ring->next_to_use,
+ tx_ring->next_to_clean,
+ tx_ring->buffer_info[eop].time_stamp,
+ eop,
+ jiffies,
+ eop_desc->status);
+ netif_stop_queue(netdev);
+ }
+ }
+
+ return cleaned;
+}
+
+/**
+ * ixgb_rx_checksum - Receive Checksum Offload for 82597.
+ * @adapter: board private structure
+ * @rx_desc: receive descriptor
+ * @sk_buff: socket buffer with received data
+ **/
+
+static void
+ixgb_rx_checksum(struct ixgb_adapter *adapter,
+ struct ixgb_rx_desc *rx_desc,
+ struct sk_buff *skb)
+{
+ /* Ignore Checksum bit is set OR
+ * TCP Checksum has not been calculated
+ */
+ if ((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
+ (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
+ skb_checksum_none_assert(skb);
+ return;
+ }
+
+ /* At this point we know the hardware did the TCP checksum */
+ /* now look at the TCP checksum error bit */
+ if (rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
+ /* let the stack verify checksum errors */
+ skb_checksum_none_assert(skb);
+ adapter->hw_csum_rx_error++;
+ } else {
+ /* TCP checksum is good */
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+ adapter->hw_csum_rx_good++;
+ }
+}
+
+/*
+ * this should improve performance for small packets with large amounts
+ * of reassembly being done in the stack
+ */
+static void ixgb_check_copybreak(struct net_device *netdev,
+ struct ixgb_buffer *buffer_info,
+ u32 length, struct sk_buff **skb)
+{
+ struct sk_buff *new_skb;
+
+ if (length > copybreak)
+ return;
+
+ new_skb = netdev_alloc_skb_ip_align(netdev, length);
+ if (!new_skb)
+ return;
+
+ skb_copy_to_linear_data_offset(new_skb, -NET_IP_ALIGN,
+ (*skb)->data - NET_IP_ALIGN,
+ length + NET_IP_ALIGN);
+ /* save the skb in buffer_info as good */
+ buffer_info->skb = *skb;
+ *skb = new_skb;
+}
+
+/**
+ * ixgb_clean_rx_irq - Send received data up the network stack,
+ * @adapter: board private structure
+ **/
+
+static bool
+ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
+{
+ struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
+ struct net_device *netdev = adapter->netdev;
+ struct pci_dev *pdev = adapter->pdev;
+ struct ixgb_rx_desc *rx_desc, *next_rxd;
+ struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
+ u32 length;
+ unsigned int i, j;
+ int cleaned_count = 0;
+ bool cleaned = false;
+
+ i = rx_ring->next_to_clean;
+ rx_desc = IXGB_RX_DESC(*rx_ring, i);
+ buffer_info = &rx_ring->buffer_info[i];
+
+ while (rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
+ struct sk_buff *skb;
+ u8 status;
+
+ if (*work_done >= work_to_do)
+ break;
+
+ (*work_done)++;
+ rmb(); /* read descriptor and rx_buffer_info after status DD */
+ status = rx_desc->status;
+ skb = buffer_info->skb;
+ buffer_info->skb = NULL;
+
+ prefetch(skb->data - NET_IP_ALIGN);
+
+ if (++i == rx_ring->count)
+ i = 0;
+ next_rxd = IXGB_RX_DESC(*rx_ring, i);
+ prefetch(next_rxd);
+
+ j = i + 1;
+ if (j == rx_ring->count)
+ j = 0;
+ next2_buffer = &rx_ring->buffer_info[j];
+ prefetch(next2_buffer);
+
+ next_buffer = &rx_ring->buffer_info[i];
+
+ cleaned = true;
+ cleaned_count++;
+
+ dma_unmap_single(&pdev->dev,
+ buffer_info->dma,
+ buffer_info->length,
+ DMA_FROM_DEVICE);
+ buffer_info->dma = 0;
+
+ length = le16_to_cpu(rx_desc->length);
+ rx_desc->length = 0;
+
+ if (unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
+
+ /* All receives must fit into a single buffer */
+
+ IXGB_DBG("Receive packet consumed multiple buffers "
+ "length<%x>\n", length);
+
+ dev_kfree_skb_irq(skb);
+ goto rxdesc_done;
+ }
+
+ if (unlikely(rx_desc->errors &
+ (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE |
+ IXGB_RX_DESC_ERRORS_P | IXGB_RX_DESC_ERRORS_RXE))) {
+ dev_kfree_skb_irq(skb);
+ goto rxdesc_done;
+ }
+
+ ixgb_check_copybreak(netdev, buffer_info, length, &skb);
+
+ /* Good Receive */
+ skb_put(skb, length);
+
+ /* Receive Checksum Offload */
+ ixgb_rx_checksum(adapter, rx_desc, skb);
+
+ skb->protocol = eth_type_trans(skb, netdev);
+ if (status & IXGB_RX_DESC_STATUS_VP)
+ __vlan_hwaccel_put_tag(skb,
+ le16_to_cpu(rx_desc->special));
+
+ netif_receive_skb(skb);
+
+rxdesc_done:
+ /* clean up descriptor, might be written over by hw */
+ rx_desc->status = 0;
+
+ /* return some buffers to hardware, one at a time is too slow */
+ if (unlikely(cleaned_count >= IXGB_RX_BUFFER_WRITE)) {
+ ixgb_alloc_rx_buffers(adapter, cleaned_count);
+ cleaned_count = 0;
+ }
+
+ /* use prefetched values */
+ rx_desc = next_rxd;
+ buffer_info = next_buffer;
+ }
+
+ rx_ring->next_to_clean = i;
+
+ cleaned_count = IXGB_DESC_UNUSED(rx_ring);
+ if (cleaned_count)
+ ixgb_alloc_rx_buffers(adapter, cleaned_count);
+
+ return cleaned;
+}
+
+/**
+ * ixgb_alloc_rx_buffers - Replace used receive buffers
+ * @adapter: address of board private structure
+ **/
+
+static void
+ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter, int cleaned_count)
+{
+ struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
+ struct net_device *netdev = adapter->netdev;
+ struct pci_dev *pdev = adapter->pdev;
+ struct ixgb_rx_desc *rx_desc;
+ struct ixgb_buffer *buffer_info;
+ struct sk_buff *skb;
+ unsigned int i;
+ long cleancount;
+
+ i = rx_ring->next_to_use;
+ buffer_info = &rx_ring->buffer_info[i];
+ cleancount = IXGB_DESC_UNUSED(rx_ring);
+
+
+ /* leave three descriptors unused */
+ while (--cleancount > 2 && cleaned_count--) {
+ /* recycle! its good for you */
+ skb = buffer_info->skb;
+ if (skb) {
+ skb_trim(skb, 0);
+ goto map_skb;
+ }
+
+ skb = netdev_alloc_skb_ip_align(netdev, adapter->rx_buffer_len);
+ if (unlikely(!skb)) {
+ /* Better luck next round */
+ adapter->alloc_rx_buff_failed++;
+ break;
+ }
+
+ buffer_info->skb = skb;
+ buffer_info->length = adapter->rx_buffer_len;
+map_skb:
+ buffer_info->dma = dma_map_single(&pdev->dev,
+ skb->data,
+ adapter->rx_buffer_len,
+ DMA_FROM_DEVICE);
+
+ rx_desc = IXGB_RX_DESC(*rx_ring, i);
+ rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
+ /* guarantee DD bit not set now before h/w gets descriptor
+ * this is the rest of the workaround for h/w double
+ * writeback. */
+ rx_desc->status = 0;
+
+
+ if (++i == rx_ring->count) i = 0;
+ buffer_info = &rx_ring->buffer_info[i];
+ }
+
+ if (likely(rx_ring->next_to_use != i)) {
+ rx_ring->next_to_use = i;
+ if (unlikely(i-- == 0))
+ i = (rx_ring->count - 1);
+
+ /* Force memory writes to complete before letting h/w
+ * know there are new descriptors to fetch. (Only
+ * applicable for weak-ordered memory model archs, such
+ * as IA-64). */
+ wmb();
+ IXGB_WRITE_REG(&adapter->hw, RDT, i);
+ }
+}
+
+static void
+ixgb_vlan_strip_enable(struct ixgb_adapter *adapter)
+{
+ u32 ctrl;
+
+ /* enable VLAN tag insert/strip */
+ ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
+ ctrl |= IXGB_CTRL0_VME;
+ IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
+}
+
+static void
+ixgb_vlan_strip_disable(struct ixgb_adapter *adapter)
+{
+ u32 ctrl;
+
+ /* disable VLAN tag insert/strip */
+ ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
+ ctrl &= ~IXGB_CTRL0_VME;
+ IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
+}
+
+static void
+ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid)
+{
+ struct ixgb_adapter *adapter = netdev_priv(netdev);
+ u32 vfta, index;
+
+ /* add VID to filter table */
+
+ index = (vid >> 5) & 0x7F;
+ vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
+ vfta |= (1 << (vid & 0x1F));
+ ixgb_write_vfta(&adapter->hw, index, vfta);
+ set_bit(vid, adapter->active_vlans);
+}
+
+static void
+ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid)
+{
+ struct ixgb_adapter *adapter = netdev_priv(netdev);
+ u32 vfta, index;
+
+ /* remove VID from filter table */
+
+ index = (vid >> 5) & 0x7F;
+ vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
+ vfta &= ~(1 << (vid & 0x1F));
+ ixgb_write_vfta(&adapter->hw, index, vfta);
+ clear_bit(vid, adapter->active_vlans);
+}
+
+static void
+ixgb_restore_vlan(struct ixgb_adapter *adapter)
+{
+ u16 vid;
+
+ for_each_set_bit(vid, adapter->active_vlans, VLAN_N_VID)
+ ixgb_vlan_rx_add_vid(adapter->netdev, vid);
+}
+
+#ifdef CONFIG_NET_POLL_CONTROLLER
+/*
+ * Polling 'interrupt' - used by things like netconsole to send skbs
+ * without having to re-enable interrupts. It's not called while
+ * the interrupt routine is executing.
+ */
+
+static void ixgb_netpoll(struct net_device *dev)
+{
+ struct ixgb_adapter *adapter = netdev_priv(dev);
+
+ disable_irq(adapter->pdev->irq);
+ ixgb_intr(adapter->pdev->irq, dev);
+ enable_irq(adapter->pdev->irq);
+}
+#endif
+
+/**
+ * ixgb_io_error_detected() - called when PCI error is detected
+ * @pdev pointer to pci device with error
+ * @state pci channel state after error
+ *
+ * This callback is called by the PCI subsystem whenever
+ * a PCI bus error is detected.
+ */
+static pci_ers_result_t ixgb_io_error_detected(struct pci_dev *pdev,
+ enum pci_channel_state state)
+{
+ struct net_device *netdev = pci_get_drvdata(pdev);
+ struct ixgb_adapter *adapter = netdev_priv(netdev);
+
+ netif_device_detach(netdev);
+
+ if (state == pci_channel_io_perm_failure)
+ return PCI_ERS_RESULT_DISCONNECT;
+
+ if (netif_running(netdev))
+ ixgb_down(adapter, true);
+
+ pci_disable_device(pdev);
+
+ /* Request a slot reset. */
+ return PCI_ERS_RESULT_NEED_RESET;
+}
+
+/**
+ * ixgb_io_slot_reset - called after the pci bus has been reset.
+ * @pdev pointer to pci device with error
+ *
+ * This callback is called after the PCI bus has been reset.
+ * Basically, this tries to restart the card from scratch.
+ * This is a shortened version of the device probe/discovery code,
+ * it resembles the first-half of the ixgb_probe() routine.
+ */
+static pci_ers_result_t ixgb_io_slot_reset(struct pci_dev *pdev)
+{
+ struct net_device *netdev = pci_get_drvdata(pdev);
+ struct ixgb_adapter *adapter = netdev_priv(netdev);
+
+ if (pci_enable_device(pdev)) {
+ netif_err(adapter, probe, adapter->netdev,
+ "Cannot re-enable PCI device after reset\n");
+ return PCI_ERS_RESULT_DISCONNECT;
+ }
+
+ /* Perform card reset only on one instance of the card */
+ if (0 != PCI_FUNC (pdev->devfn))
+ return PCI_ERS_RESULT_RECOVERED;
+
+ pci_set_master(pdev);
+
+ netif_carrier_off(netdev);
+ netif_stop_queue(netdev);
+ ixgb_reset(adapter);
+
+ /* Make sure the EEPROM is good */
+ if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
+ netif_err(adapter, probe, adapter->netdev,
+ "After reset, the EEPROM checksum is not valid\n");
+ return PCI_ERS_RESULT_DISCONNECT;
+ }
+ ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
+ memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
+
+ if (!is_valid_ether_addr(netdev->perm_addr)) {
+ netif_err(adapter, probe, adapter->netdev,
+ "After reset, invalid MAC address\n");
+ return PCI_ERS_RESULT_DISCONNECT;
+ }
+
+ return PCI_ERS_RESULT_RECOVERED;
+}
+
+/**
+ * ixgb_io_resume - called when its OK to resume normal operations
+ * @pdev pointer to pci device with error
+ *
+ * The error recovery driver tells us that its OK to resume
+ * normal operation. Implementation resembles the second-half
+ * of the ixgb_probe() routine.
+ */
+static void ixgb_io_resume(struct pci_dev *pdev)
+{
+ struct net_device *netdev = pci_get_drvdata(pdev);
+ struct ixgb_adapter *adapter = netdev_priv(netdev);
+
+ pci_set_master(pdev);
+
+ if (netif_running(netdev)) {
+ if (ixgb_up(adapter)) {
+ pr_err("can't bring device back up after reset\n");
+ return;
+ }
+ }
+
+ netif_device_attach(netdev);
+ mod_timer(&adapter->watchdog_timer, jiffies);
+}
+
+/* ixgb_main.c */