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0001 // SPDX-License-Identifier: GPL-2.0
0002 /* Copyright(c) 1999 - 2008 Intel Corporation. */
0003 
0004 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
0005 
0006 #include <linux/prefetch.h>
0007 #include "ixgb.h"
0008 
0009 char ixgb_driver_name[] = "ixgb";
0010 static char ixgb_driver_string[] = "Intel(R) PRO/10GbE Network Driver";
0011 
0012 static const char ixgb_copyright[] = "Copyright (c) 1999-2008 Intel Corporation.";
0013 
0014 #define IXGB_CB_LENGTH 256
0015 static unsigned int copybreak __read_mostly = IXGB_CB_LENGTH;
0016 module_param(copybreak, uint, 0644);
0017 MODULE_PARM_DESC(copybreak,
0018     "Maximum size of packet that is copied to a new buffer on receive");
0019 
0020 /* ixgb_pci_tbl - PCI Device ID Table
0021  *
0022  * Wildcard entries (PCI_ANY_ID) should come last
0023  * Last entry must be all 0s
0024  *
0025  * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
0026  *   Class, Class Mask, private data (not used) }
0027  */
0028 static const struct pci_device_id ixgb_pci_tbl[] = {
0029     {PCI_VENDOR_ID_INTEL, IXGB_DEVICE_ID_82597EX,
0030      PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
0031     {PCI_VENDOR_ID_INTEL, IXGB_DEVICE_ID_82597EX_CX4,
0032      PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
0033     {PCI_VENDOR_ID_INTEL, IXGB_DEVICE_ID_82597EX_SR,
0034      PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
0035     {PCI_VENDOR_ID_INTEL, IXGB_DEVICE_ID_82597EX_LR,
0036      PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
0037 
0038     /* required last entry */
0039     {0,}
0040 };
0041 
0042 MODULE_DEVICE_TABLE(pci, ixgb_pci_tbl);
0043 
0044 /* Local Function Prototypes */
0045 static int ixgb_init_module(void);
0046 static void ixgb_exit_module(void);
0047 static int ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
0048 static void ixgb_remove(struct pci_dev *pdev);
0049 static int ixgb_sw_init(struct ixgb_adapter *adapter);
0050 static int ixgb_open(struct net_device *netdev);
0051 static int ixgb_close(struct net_device *netdev);
0052 static void ixgb_configure_tx(struct ixgb_adapter *adapter);
0053 static void ixgb_configure_rx(struct ixgb_adapter *adapter);
0054 static void ixgb_setup_rctl(struct ixgb_adapter *adapter);
0055 static void ixgb_clean_tx_ring(struct ixgb_adapter *adapter);
0056 static void ixgb_clean_rx_ring(struct ixgb_adapter *adapter);
0057 static void ixgb_set_multi(struct net_device *netdev);
0058 static void ixgb_watchdog(struct timer_list *t);
0059 static netdev_tx_t ixgb_xmit_frame(struct sk_buff *skb,
0060                    struct net_device *netdev);
0061 static int ixgb_change_mtu(struct net_device *netdev, int new_mtu);
0062 static int ixgb_set_mac(struct net_device *netdev, void *p);
0063 static irqreturn_t ixgb_intr(int irq, void *data);
0064 static bool ixgb_clean_tx_irq(struct ixgb_adapter *adapter);
0065 
0066 static int ixgb_clean(struct napi_struct *, int);
0067 static bool ixgb_clean_rx_irq(struct ixgb_adapter *, int *, int);
0068 static void ixgb_alloc_rx_buffers(struct ixgb_adapter *, int);
0069 
0070 static void ixgb_tx_timeout(struct net_device *dev, unsigned int txqueue);
0071 static void ixgb_tx_timeout_task(struct work_struct *work);
0072 
0073 static void ixgb_vlan_strip_enable(struct ixgb_adapter *adapter);
0074 static void ixgb_vlan_strip_disable(struct ixgb_adapter *adapter);
0075 static int ixgb_vlan_rx_add_vid(struct net_device *netdev,
0076                 __be16 proto, u16 vid);
0077 static int ixgb_vlan_rx_kill_vid(struct net_device *netdev,
0078                  __be16 proto, u16 vid);
0079 static void ixgb_restore_vlan(struct ixgb_adapter *adapter);
0080 
0081 static pci_ers_result_t ixgb_io_error_detected (struct pci_dev *pdev,
0082                              pci_channel_state_t state);
0083 static pci_ers_result_t ixgb_io_slot_reset (struct pci_dev *pdev);
0084 static void ixgb_io_resume (struct pci_dev *pdev);
0085 
0086 static const struct pci_error_handlers ixgb_err_handler = {
0087     .error_detected = ixgb_io_error_detected,
0088     .slot_reset = ixgb_io_slot_reset,
0089     .resume = ixgb_io_resume,
0090 };
0091 
0092 static struct pci_driver ixgb_driver = {
0093     .name     = ixgb_driver_name,
0094     .id_table = ixgb_pci_tbl,
0095     .probe    = ixgb_probe,
0096     .remove   = ixgb_remove,
0097     .err_handler = &ixgb_err_handler
0098 };
0099 
0100 MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
0101 MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver");
0102 MODULE_LICENSE("GPL v2");
0103 
0104 #define DEFAULT_MSG_ENABLE (NETIF_MSG_DRV|NETIF_MSG_PROBE|NETIF_MSG_LINK)
0105 static int debug = -1;
0106 module_param(debug, int, 0);
0107 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
0108 
0109 /**
0110  * ixgb_init_module - Driver Registration Routine
0111  *
0112  * ixgb_init_module is the first routine called when the driver is
0113  * loaded. All it does is register with the PCI subsystem.
0114  **/
0115 
0116 static int __init
0117 ixgb_init_module(void)
0118 {
0119     pr_info("%s\n", ixgb_driver_string);
0120     pr_info("%s\n", ixgb_copyright);
0121 
0122     return pci_register_driver(&ixgb_driver);
0123 }
0124 
0125 module_init(ixgb_init_module);
0126 
0127 /**
0128  * ixgb_exit_module - Driver Exit Cleanup Routine
0129  *
0130  * ixgb_exit_module is called just before the driver is removed
0131  * from memory.
0132  **/
0133 
0134 static void __exit
0135 ixgb_exit_module(void)
0136 {
0137     pci_unregister_driver(&ixgb_driver);
0138 }
0139 
0140 module_exit(ixgb_exit_module);
0141 
0142 /**
0143  * ixgb_irq_disable - Mask off interrupt generation on the NIC
0144  * @adapter: board private structure
0145  **/
0146 
0147 static void
0148 ixgb_irq_disable(struct ixgb_adapter *adapter)
0149 {
0150     IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
0151     IXGB_WRITE_FLUSH(&adapter->hw);
0152     synchronize_irq(adapter->pdev->irq);
0153 }
0154 
0155 /**
0156  * ixgb_irq_enable - Enable default interrupt generation settings
0157  * @adapter: board private structure
0158  **/
0159 
0160 static void
0161 ixgb_irq_enable(struct ixgb_adapter *adapter)
0162 {
0163     u32 val = IXGB_INT_RXT0 | IXGB_INT_RXDMT0 |
0164           IXGB_INT_TXDW | IXGB_INT_LSC;
0165     if (adapter->hw.subsystem_vendor_id == PCI_VENDOR_ID_SUN)
0166         val |= IXGB_INT_GPI0;
0167     IXGB_WRITE_REG(&adapter->hw, IMS, val);
0168     IXGB_WRITE_FLUSH(&adapter->hw);
0169 }
0170 
0171 int
0172 ixgb_up(struct ixgb_adapter *adapter)
0173 {
0174     struct net_device *netdev = adapter->netdev;
0175     int err, irq_flags = IRQF_SHARED;
0176     int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
0177     struct ixgb_hw *hw = &adapter->hw;
0178 
0179     /* hardware has been reset, we need to reload some things */
0180 
0181     ixgb_rar_set(hw, netdev->dev_addr, 0);
0182     ixgb_set_multi(netdev);
0183 
0184     ixgb_restore_vlan(adapter);
0185 
0186     ixgb_configure_tx(adapter);
0187     ixgb_setup_rctl(adapter);
0188     ixgb_configure_rx(adapter);
0189     ixgb_alloc_rx_buffers(adapter, IXGB_DESC_UNUSED(&adapter->rx_ring));
0190 
0191     /* disable interrupts and get the hardware into a known state */
0192     IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);
0193 
0194     /* only enable MSI if bus is in PCI-X mode */
0195     if (IXGB_READ_REG(&adapter->hw, STATUS) & IXGB_STATUS_PCIX_MODE) {
0196         err = pci_enable_msi(adapter->pdev);
0197         if (!err) {
0198             adapter->have_msi = true;
0199             irq_flags = 0;
0200         }
0201         /* proceed to try to request regular interrupt */
0202     }
0203 
0204     err = request_irq(adapter->pdev->irq, ixgb_intr, irq_flags,
0205                       netdev->name, netdev);
0206     if (err) {
0207         if (adapter->have_msi)
0208             pci_disable_msi(adapter->pdev);
0209         netif_err(adapter, probe, adapter->netdev,
0210               "Unable to allocate interrupt Error: %d\n", err);
0211         return err;
0212     }
0213 
0214     if ((hw->max_frame_size != max_frame) ||
0215         (hw->max_frame_size !=
0216         (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {
0217 
0218         hw->max_frame_size = max_frame;
0219 
0220         IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
0221 
0222         if (hw->max_frame_size >
0223            IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
0224             u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
0225 
0226             if (!(ctrl0 & IXGB_CTRL0_JFE)) {
0227                 ctrl0 |= IXGB_CTRL0_JFE;
0228                 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
0229             }
0230         }
0231     }
0232 
0233     clear_bit(__IXGB_DOWN, &adapter->flags);
0234 
0235     napi_enable(&adapter->napi);
0236     ixgb_irq_enable(adapter);
0237 
0238     netif_wake_queue(netdev);
0239 
0240     mod_timer(&adapter->watchdog_timer, jiffies);
0241 
0242     return 0;
0243 }
0244 
0245 void
0246 ixgb_down(struct ixgb_adapter *adapter, bool kill_watchdog)
0247 {
0248     struct net_device *netdev = adapter->netdev;
0249 
0250     /* prevent the interrupt handler from restarting watchdog */
0251     set_bit(__IXGB_DOWN, &adapter->flags);
0252 
0253     netif_carrier_off(netdev);
0254 
0255     napi_disable(&adapter->napi);
0256     /* waiting for NAPI to complete can re-enable interrupts */
0257     ixgb_irq_disable(adapter);
0258     free_irq(adapter->pdev->irq, netdev);
0259 
0260     if (adapter->have_msi)
0261         pci_disable_msi(adapter->pdev);
0262 
0263     if (kill_watchdog)
0264         del_timer_sync(&adapter->watchdog_timer);
0265 
0266     adapter->link_speed = 0;
0267     adapter->link_duplex = 0;
0268     netif_stop_queue(netdev);
0269 
0270     ixgb_reset(adapter);
0271     ixgb_clean_tx_ring(adapter);
0272     ixgb_clean_rx_ring(adapter);
0273 }
0274 
0275 void
0276 ixgb_reset(struct ixgb_adapter *adapter)
0277 {
0278     struct ixgb_hw *hw = &adapter->hw;
0279 
0280     ixgb_adapter_stop(hw);
0281     if (!ixgb_init_hw(hw))
0282         netif_err(adapter, probe, adapter->netdev, "ixgb_init_hw failed\n");
0283 
0284     /* restore frame size information */
0285     IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
0286     if (hw->max_frame_size >
0287         IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
0288         u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
0289         if (!(ctrl0 & IXGB_CTRL0_JFE)) {
0290             ctrl0 |= IXGB_CTRL0_JFE;
0291             IXGB_WRITE_REG(hw, CTRL0, ctrl0);
0292         }
0293     }
0294 }
0295 
0296 static netdev_features_t
0297 ixgb_fix_features(struct net_device *netdev, netdev_features_t features)
0298 {
0299     /*
0300      * Tx VLAN insertion does not work per HW design when Rx stripping is
0301      * disabled.
0302      */
0303     if (!(features & NETIF_F_HW_VLAN_CTAG_RX))
0304         features &= ~NETIF_F_HW_VLAN_CTAG_TX;
0305 
0306     return features;
0307 }
0308 
0309 static int
0310 ixgb_set_features(struct net_device *netdev, netdev_features_t features)
0311 {
0312     struct ixgb_adapter *adapter = netdev_priv(netdev);
0313     netdev_features_t changed = features ^ netdev->features;
0314 
0315     if (!(changed & (NETIF_F_RXCSUM|NETIF_F_HW_VLAN_CTAG_RX)))
0316         return 0;
0317 
0318     adapter->rx_csum = !!(features & NETIF_F_RXCSUM);
0319 
0320     if (netif_running(netdev)) {
0321         ixgb_down(adapter, true);
0322         ixgb_up(adapter);
0323         ixgb_set_speed_duplex(netdev);
0324     } else
0325         ixgb_reset(adapter);
0326 
0327     return 0;
0328 }
0329 
0330 
0331 static const struct net_device_ops ixgb_netdev_ops = {
0332     .ndo_open       = ixgb_open,
0333     .ndo_stop       = ixgb_close,
0334     .ndo_start_xmit     = ixgb_xmit_frame,
0335     .ndo_set_rx_mode    = ixgb_set_multi,
0336     .ndo_validate_addr  = eth_validate_addr,
0337     .ndo_set_mac_address    = ixgb_set_mac,
0338     .ndo_change_mtu     = ixgb_change_mtu,
0339     .ndo_tx_timeout     = ixgb_tx_timeout,
0340     .ndo_vlan_rx_add_vid    = ixgb_vlan_rx_add_vid,
0341     .ndo_vlan_rx_kill_vid   = ixgb_vlan_rx_kill_vid,
0342     .ndo_fix_features       = ixgb_fix_features,
0343     .ndo_set_features       = ixgb_set_features,
0344 };
0345 
0346 /**
0347  * ixgb_probe - Device Initialization Routine
0348  * @pdev: PCI device information struct
0349  * @ent: entry in ixgb_pci_tbl
0350  *
0351  * Returns 0 on success, negative on failure
0352  *
0353  * ixgb_probe initializes an adapter identified by a pci_dev structure.
0354  * The OS initialization, configuring of the adapter private structure,
0355  * and a hardware reset occur.
0356  **/
0357 
0358 static int
0359 ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
0360 {
0361     struct net_device *netdev = NULL;
0362     struct ixgb_adapter *adapter;
0363     static int cards_found = 0;
0364     u8 addr[ETH_ALEN];
0365     int i;
0366     int err;
0367 
0368     err = pci_enable_device(pdev);
0369     if (err)
0370         return err;
0371 
0372     err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
0373     if (err) {
0374         pr_err("No usable DMA configuration, aborting\n");
0375         goto err_dma_mask;
0376     }
0377 
0378     err = pci_request_regions(pdev, ixgb_driver_name);
0379     if (err)
0380         goto err_request_regions;
0381 
0382     pci_set_master(pdev);
0383 
0384     netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
0385     if (!netdev) {
0386         err = -ENOMEM;
0387         goto err_alloc_etherdev;
0388     }
0389 
0390     SET_NETDEV_DEV(netdev, &pdev->dev);
0391 
0392     pci_set_drvdata(pdev, netdev);
0393     adapter = netdev_priv(netdev);
0394     adapter->netdev = netdev;
0395     adapter->pdev = pdev;
0396     adapter->hw.back = adapter;
0397     adapter->msg_enable = netif_msg_init(debug, DEFAULT_MSG_ENABLE);
0398 
0399     adapter->hw.hw_addr = pci_ioremap_bar(pdev, BAR_0);
0400     if (!adapter->hw.hw_addr) {
0401         err = -EIO;
0402         goto err_ioremap;
0403     }
0404 
0405     for (i = BAR_1; i < PCI_STD_NUM_BARS; i++) {
0406         if (pci_resource_len(pdev, i) == 0)
0407             continue;
0408         if (pci_resource_flags(pdev, i) & IORESOURCE_IO) {
0409             adapter->hw.io_base = pci_resource_start(pdev, i);
0410             break;
0411         }
0412     }
0413 
0414     netdev->netdev_ops = &ixgb_netdev_ops;
0415     ixgb_set_ethtool_ops(netdev);
0416     netdev->watchdog_timeo = 5 * HZ;
0417     netif_napi_add(netdev, &adapter->napi, ixgb_clean, 64);
0418 
0419     strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
0420 
0421     adapter->bd_number = cards_found;
0422     adapter->link_speed = 0;
0423     adapter->link_duplex = 0;
0424 
0425     /* setup the private structure */
0426 
0427     err = ixgb_sw_init(adapter);
0428     if (err)
0429         goto err_sw_init;
0430 
0431     netdev->hw_features = NETIF_F_SG |
0432                NETIF_F_TSO |
0433                NETIF_F_HW_CSUM |
0434                NETIF_F_HW_VLAN_CTAG_TX |
0435                NETIF_F_HW_VLAN_CTAG_RX;
0436     netdev->features = netdev->hw_features |
0437                NETIF_F_HW_VLAN_CTAG_FILTER;
0438     netdev->hw_features |= NETIF_F_RXCSUM;
0439 
0440     netdev->features |= NETIF_F_HIGHDMA;
0441     netdev->vlan_features |= NETIF_F_HIGHDMA;
0442 
0443     /* MTU range: 68 - 16114 */
0444     netdev->min_mtu = ETH_MIN_MTU;
0445     netdev->max_mtu = IXGB_MAX_JUMBO_FRAME_SIZE - ETH_HLEN;
0446 
0447     /* make sure the EEPROM is good */
0448 
0449     if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
0450         netif_err(adapter, probe, adapter->netdev,
0451               "The EEPROM Checksum Is Not Valid\n");
0452         err = -EIO;
0453         goto err_eeprom;
0454     }
0455 
0456     ixgb_get_ee_mac_addr(&adapter->hw, addr);
0457     eth_hw_addr_set(netdev, addr);
0458 
0459     if (!is_valid_ether_addr(netdev->dev_addr)) {
0460         netif_err(adapter, probe, adapter->netdev, "Invalid MAC Address\n");
0461         err = -EIO;
0462         goto err_eeprom;
0463     }
0464 
0465     adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
0466 
0467     timer_setup(&adapter->watchdog_timer, ixgb_watchdog, 0);
0468 
0469     INIT_WORK(&adapter->tx_timeout_task, ixgb_tx_timeout_task);
0470 
0471     strcpy(netdev->name, "eth%d");
0472     err = register_netdev(netdev);
0473     if (err)
0474         goto err_register;
0475 
0476     /* carrier off reporting is important to ethtool even BEFORE open */
0477     netif_carrier_off(netdev);
0478 
0479     netif_info(adapter, probe, adapter->netdev,
0480            "Intel(R) PRO/10GbE Network Connection\n");
0481     ixgb_check_options(adapter);
0482     /* reset the hardware with the new settings */
0483 
0484     ixgb_reset(adapter);
0485 
0486     cards_found++;
0487     return 0;
0488 
0489 err_register:
0490 err_sw_init:
0491 err_eeprom:
0492     iounmap(adapter->hw.hw_addr);
0493 err_ioremap:
0494     free_netdev(netdev);
0495 err_alloc_etherdev:
0496     pci_release_regions(pdev);
0497 err_request_regions:
0498 err_dma_mask:
0499     pci_disable_device(pdev);
0500     return err;
0501 }
0502 
0503 /**
0504  * ixgb_remove - Device Removal Routine
0505  * @pdev: PCI device information struct
0506  *
0507  * ixgb_remove is called by the PCI subsystem to alert the driver
0508  * that it should release a PCI device.  The could be caused by a
0509  * Hot-Plug event, or because the driver is going to be removed from
0510  * memory.
0511  **/
0512 
0513 static void
0514 ixgb_remove(struct pci_dev *pdev)
0515 {
0516     struct net_device *netdev = pci_get_drvdata(pdev);
0517     struct ixgb_adapter *adapter = netdev_priv(netdev);
0518 
0519     cancel_work_sync(&adapter->tx_timeout_task);
0520 
0521     unregister_netdev(netdev);
0522 
0523     iounmap(adapter->hw.hw_addr);
0524     pci_release_regions(pdev);
0525 
0526     free_netdev(netdev);
0527     pci_disable_device(pdev);
0528 }
0529 
0530 /**
0531  * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
0532  * @adapter: board private structure to initialize
0533  *
0534  * ixgb_sw_init initializes the Adapter private data structure.
0535  * Fields are initialized based on PCI device information and
0536  * OS network device settings (MTU size).
0537  **/
0538 
0539 static int
0540 ixgb_sw_init(struct ixgb_adapter *adapter)
0541 {
0542     struct ixgb_hw *hw = &adapter->hw;
0543     struct net_device *netdev = adapter->netdev;
0544     struct pci_dev *pdev = adapter->pdev;
0545 
0546     /* PCI config space info */
0547 
0548     hw->vendor_id = pdev->vendor;
0549     hw->device_id = pdev->device;
0550     hw->subsystem_vendor_id = pdev->subsystem_vendor;
0551     hw->subsystem_id = pdev->subsystem_device;
0552 
0553     hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
0554     adapter->rx_buffer_len = hw->max_frame_size + 8; /* + 8 for errata */
0555 
0556     if ((hw->device_id == IXGB_DEVICE_ID_82597EX) ||
0557         (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4) ||
0558         (hw->device_id == IXGB_DEVICE_ID_82597EX_LR) ||
0559         (hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
0560         hw->mac_type = ixgb_82597;
0561     else {
0562         /* should never have loaded on this device */
0563         netif_err(adapter, probe, adapter->netdev, "unsupported device id\n");
0564     }
0565 
0566     /* enable flow control to be programmed */
0567     hw->fc.send_xon = 1;
0568 
0569     set_bit(__IXGB_DOWN, &adapter->flags);
0570     return 0;
0571 }
0572 
0573 /**
0574  * ixgb_open - Called when a network interface is made active
0575  * @netdev: network interface device structure
0576  *
0577  * Returns 0 on success, negative value on failure
0578  *
0579  * The open entry point is called when a network interface is made
0580  * active by the system (IFF_UP).  At this point all resources needed
0581  * for transmit and receive operations are allocated, the interrupt
0582  * handler is registered with the OS, the watchdog timer is started,
0583  * and the stack is notified that the interface is ready.
0584  **/
0585 
0586 static int
0587 ixgb_open(struct net_device *netdev)
0588 {
0589     struct ixgb_adapter *adapter = netdev_priv(netdev);
0590     int err;
0591 
0592     /* allocate transmit descriptors */
0593     err = ixgb_setup_tx_resources(adapter);
0594     if (err)
0595         goto err_setup_tx;
0596 
0597     netif_carrier_off(netdev);
0598 
0599     /* allocate receive descriptors */
0600 
0601     err = ixgb_setup_rx_resources(adapter);
0602     if (err)
0603         goto err_setup_rx;
0604 
0605     err = ixgb_up(adapter);
0606     if (err)
0607         goto err_up;
0608 
0609     netif_start_queue(netdev);
0610 
0611     return 0;
0612 
0613 err_up:
0614     ixgb_free_rx_resources(adapter);
0615 err_setup_rx:
0616     ixgb_free_tx_resources(adapter);
0617 err_setup_tx:
0618     ixgb_reset(adapter);
0619 
0620     return err;
0621 }
0622 
0623 /**
0624  * ixgb_close - Disables a network interface
0625  * @netdev: network interface device structure
0626  *
0627  * Returns 0, this is not allowed to fail
0628  *
0629  * The close entry point is called when an interface is de-activated
0630  * by the OS.  The hardware is still under the drivers control, but
0631  * needs to be disabled.  A global MAC reset is issued to stop the
0632  * hardware, and all transmit and receive resources are freed.
0633  **/
0634 
0635 static int
0636 ixgb_close(struct net_device *netdev)
0637 {
0638     struct ixgb_adapter *adapter = netdev_priv(netdev);
0639 
0640     ixgb_down(adapter, true);
0641 
0642     ixgb_free_tx_resources(adapter);
0643     ixgb_free_rx_resources(adapter);
0644 
0645     return 0;
0646 }
0647 
0648 /**
0649  * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
0650  * @adapter: board private structure
0651  *
0652  * Return 0 on success, negative on failure
0653  **/
0654 
0655 int
0656 ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
0657 {
0658     struct ixgb_desc_ring *txdr = &adapter->tx_ring;
0659     struct pci_dev *pdev = adapter->pdev;
0660     int size;
0661 
0662     size = sizeof(struct ixgb_buffer) * txdr->count;
0663     txdr->buffer_info = vzalloc(size);
0664     if (!txdr->buffer_info)
0665         return -ENOMEM;
0666 
0667     /* round up to nearest 4K */
0668 
0669     txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
0670     txdr->size = ALIGN(txdr->size, 4096);
0671 
0672     txdr->desc = dma_alloc_coherent(&pdev->dev, txdr->size, &txdr->dma,
0673                     GFP_KERNEL);
0674     if (!txdr->desc) {
0675         vfree(txdr->buffer_info);
0676         return -ENOMEM;
0677     }
0678 
0679     txdr->next_to_use = 0;
0680     txdr->next_to_clean = 0;
0681 
0682     return 0;
0683 }
0684 
0685 /**
0686  * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
0687  * @adapter: board private structure
0688  *
0689  * Configure the Tx unit of the MAC after a reset.
0690  **/
0691 
0692 static void
0693 ixgb_configure_tx(struct ixgb_adapter *adapter)
0694 {
0695     u64 tdba = adapter->tx_ring.dma;
0696     u32 tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
0697     u32 tctl;
0698     struct ixgb_hw *hw = &adapter->hw;
0699 
0700     /* Setup the Base and Length of the Tx Descriptor Ring
0701      * tx_ring.dma can be either a 32 or 64 bit value
0702      */
0703 
0704     IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
0705     IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
0706 
0707     IXGB_WRITE_REG(hw, TDLEN, tdlen);
0708 
0709     /* Setup the HW Tx Head and Tail descriptor pointers */
0710 
0711     IXGB_WRITE_REG(hw, TDH, 0);
0712     IXGB_WRITE_REG(hw, TDT, 0);
0713 
0714     /* don't set up txdctl, it induces performance problems if configured
0715      * incorrectly */
0716     /* Set the Tx Interrupt Delay register */
0717 
0718     IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
0719 
0720     /* Program the Transmit Control Register */
0721 
0722     tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
0723     IXGB_WRITE_REG(hw, TCTL, tctl);
0724 
0725     /* Setup Transmit Descriptor Settings for this adapter */
0726     adapter->tx_cmd_type =
0727         IXGB_TX_DESC_TYPE |
0728         (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
0729 }
0730 
0731 /**
0732  * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
0733  * @adapter: board private structure
0734  *
0735  * Returns 0 on success, negative on failure
0736  **/
0737 
0738 int
0739 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
0740 {
0741     struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
0742     struct pci_dev *pdev = adapter->pdev;
0743     int size;
0744 
0745     size = sizeof(struct ixgb_buffer) * rxdr->count;
0746     rxdr->buffer_info = vzalloc(size);
0747     if (!rxdr->buffer_info)
0748         return -ENOMEM;
0749 
0750     /* Round up to nearest 4K */
0751 
0752     rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
0753     rxdr->size = ALIGN(rxdr->size, 4096);
0754 
0755     rxdr->desc = dma_alloc_coherent(&pdev->dev, rxdr->size, &rxdr->dma,
0756                     GFP_KERNEL);
0757 
0758     if (!rxdr->desc) {
0759         vfree(rxdr->buffer_info);
0760         return -ENOMEM;
0761     }
0762 
0763     rxdr->next_to_clean = 0;
0764     rxdr->next_to_use = 0;
0765 
0766     return 0;
0767 }
0768 
0769 /**
0770  * ixgb_setup_rctl - configure the receive control register
0771  * @adapter: Board private structure
0772  **/
0773 
0774 static void
0775 ixgb_setup_rctl(struct ixgb_adapter *adapter)
0776 {
0777     u32 rctl;
0778 
0779     rctl = IXGB_READ_REG(&adapter->hw, RCTL);
0780 
0781     rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
0782 
0783     rctl |=
0784         IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
0785         IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
0786         (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
0787 
0788     rctl |= IXGB_RCTL_SECRC;
0789 
0790     if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048)
0791         rctl |= IXGB_RCTL_BSIZE_2048;
0792     else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096)
0793         rctl |= IXGB_RCTL_BSIZE_4096;
0794     else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192)
0795         rctl |= IXGB_RCTL_BSIZE_8192;
0796     else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384)
0797         rctl |= IXGB_RCTL_BSIZE_16384;
0798 
0799     IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
0800 }
0801 
0802 /**
0803  * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
0804  * @adapter: board private structure
0805  *
0806  * Configure the Rx unit of the MAC after a reset.
0807  **/
0808 
0809 static void
0810 ixgb_configure_rx(struct ixgb_adapter *adapter)
0811 {
0812     u64 rdba = adapter->rx_ring.dma;
0813     u32 rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
0814     struct ixgb_hw *hw = &adapter->hw;
0815     u32 rctl;
0816     u32 rxcsum;
0817 
0818     /* make sure receives are disabled while setting up the descriptors */
0819 
0820     rctl = IXGB_READ_REG(hw, RCTL);
0821     IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
0822 
0823     /* set the Receive Delay Timer Register */
0824 
0825     IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
0826 
0827     /* Setup the Base and Length of the Rx Descriptor Ring */
0828 
0829     IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
0830     IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
0831 
0832     IXGB_WRITE_REG(hw, RDLEN, rdlen);
0833 
0834     /* Setup the HW Rx Head and Tail Descriptor Pointers */
0835     IXGB_WRITE_REG(hw, RDH, 0);
0836     IXGB_WRITE_REG(hw, RDT, 0);
0837 
0838     /* due to the hardware errata with RXDCTL, we are unable to use any of
0839      * the performance enhancing features of it without causing other
0840      * subtle bugs, some of the bugs could include receive length
0841      * corruption at high data rates (WTHRESH > 0) and/or receive
0842      * descriptor ring irregularites (particularly in hardware cache) */
0843     IXGB_WRITE_REG(hw, RXDCTL, 0);
0844 
0845     /* Enable Receive Checksum Offload for TCP and UDP */
0846     if (adapter->rx_csum) {
0847         rxcsum = IXGB_READ_REG(hw, RXCSUM);
0848         rxcsum |= IXGB_RXCSUM_TUOFL;
0849         IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
0850     }
0851 
0852     /* Enable Receives */
0853 
0854     IXGB_WRITE_REG(hw, RCTL, rctl);
0855 }
0856 
0857 /**
0858  * ixgb_free_tx_resources - Free Tx Resources
0859  * @adapter: board private structure
0860  *
0861  * Free all transmit software resources
0862  **/
0863 
0864 void
0865 ixgb_free_tx_resources(struct ixgb_adapter *adapter)
0866 {
0867     struct pci_dev *pdev = adapter->pdev;
0868 
0869     ixgb_clean_tx_ring(adapter);
0870 
0871     vfree(adapter->tx_ring.buffer_info);
0872     adapter->tx_ring.buffer_info = NULL;
0873 
0874     dma_free_coherent(&pdev->dev, adapter->tx_ring.size,
0875               adapter->tx_ring.desc, adapter->tx_ring.dma);
0876 
0877     adapter->tx_ring.desc = NULL;
0878 }
0879 
0880 static void
0881 ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
0882                                 struct ixgb_buffer *buffer_info)
0883 {
0884     if (buffer_info->dma) {
0885         if (buffer_info->mapped_as_page)
0886             dma_unmap_page(&adapter->pdev->dev, buffer_info->dma,
0887                        buffer_info->length, DMA_TO_DEVICE);
0888         else
0889             dma_unmap_single(&adapter->pdev->dev, buffer_info->dma,
0890                      buffer_info->length, DMA_TO_DEVICE);
0891         buffer_info->dma = 0;
0892     }
0893 
0894     if (buffer_info->skb) {
0895         dev_kfree_skb_any(buffer_info->skb);
0896         buffer_info->skb = NULL;
0897     }
0898     buffer_info->time_stamp = 0;
0899     /* these fields must always be initialized in tx
0900      * buffer_info->length = 0;
0901      * buffer_info->next_to_watch = 0; */
0902 }
0903 
0904 /**
0905  * ixgb_clean_tx_ring - Free Tx Buffers
0906  * @adapter: board private structure
0907  **/
0908 
0909 static void
0910 ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
0911 {
0912     struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
0913     struct ixgb_buffer *buffer_info;
0914     unsigned long size;
0915     unsigned int i;
0916 
0917     /* Free all the Tx ring sk_buffs */
0918 
0919     for (i = 0; i < tx_ring->count; i++) {
0920         buffer_info = &tx_ring->buffer_info[i];
0921         ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
0922     }
0923 
0924     size = sizeof(struct ixgb_buffer) * tx_ring->count;
0925     memset(tx_ring->buffer_info, 0, size);
0926 
0927     /* Zero out the descriptor ring */
0928 
0929     memset(tx_ring->desc, 0, tx_ring->size);
0930 
0931     tx_ring->next_to_use = 0;
0932     tx_ring->next_to_clean = 0;
0933 
0934     IXGB_WRITE_REG(&adapter->hw, TDH, 0);
0935     IXGB_WRITE_REG(&adapter->hw, TDT, 0);
0936 }
0937 
0938 /**
0939  * ixgb_free_rx_resources - Free Rx Resources
0940  * @adapter: board private structure
0941  *
0942  * Free all receive software resources
0943  **/
0944 
0945 void
0946 ixgb_free_rx_resources(struct ixgb_adapter *adapter)
0947 {
0948     struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
0949     struct pci_dev *pdev = adapter->pdev;
0950 
0951     ixgb_clean_rx_ring(adapter);
0952 
0953     vfree(rx_ring->buffer_info);
0954     rx_ring->buffer_info = NULL;
0955 
0956     dma_free_coherent(&pdev->dev, rx_ring->size, rx_ring->desc,
0957               rx_ring->dma);
0958 
0959     rx_ring->desc = NULL;
0960 }
0961 
0962 /**
0963  * ixgb_clean_rx_ring - Free Rx Buffers
0964  * @adapter: board private structure
0965  **/
0966 
0967 static void
0968 ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
0969 {
0970     struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
0971     struct ixgb_buffer *buffer_info;
0972     struct pci_dev *pdev = adapter->pdev;
0973     unsigned long size;
0974     unsigned int i;
0975 
0976     /* Free all the Rx ring sk_buffs */
0977 
0978     for (i = 0; i < rx_ring->count; i++) {
0979         buffer_info = &rx_ring->buffer_info[i];
0980         if (buffer_info->dma) {
0981             dma_unmap_single(&pdev->dev,
0982                      buffer_info->dma,
0983                      buffer_info->length,
0984                      DMA_FROM_DEVICE);
0985             buffer_info->dma = 0;
0986             buffer_info->length = 0;
0987         }
0988 
0989         if (buffer_info->skb) {
0990             dev_kfree_skb(buffer_info->skb);
0991             buffer_info->skb = NULL;
0992         }
0993     }
0994 
0995     size = sizeof(struct ixgb_buffer) * rx_ring->count;
0996     memset(rx_ring->buffer_info, 0, size);
0997 
0998     /* Zero out the descriptor ring */
0999 
1000     memset(rx_ring->desc, 0, rx_ring->size);
1001 
1002     rx_ring->next_to_clean = 0;
1003     rx_ring->next_to_use = 0;
1004 
1005     IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1006     IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1007 }
1008 
1009 /**
1010  * ixgb_set_mac - Change the Ethernet Address of the NIC
1011  * @netdev: network interface device structure
1012  * @p: pointer to an address structure
1013  *
1014  * Returns 0 on success, negative on failure
1015  **/
1016 
1017 static int
1018 ixgb_set_mac(struct net_device *netdev, void *p)
1019 {
1020     struct ixgb_adapter *adapter = netdev_priv(netdev);
1021     struct sockaddr *addr = p;
1022 
1023     if (!is_valid_ether_addr(addr->sa_data))
1024         return -EADDRNOTAVAIL;
1025 
1026     eth_hw_addr_set(netdev, addr->sa_data);
1027 
1028     ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1029 
1030     return 0;
1031 }
1032 
1033 /**
1034  * ixgb_set_multi - Multicast and Promiscuous mode set
1035  * @netdev: network interface device structure
1036  *
1037  * The set_multi entry point is called whenever the multicast address
1038  * list or the network interface flags are updated.  This routine is
1039  * responsible for configuring the hardware for proper multicast,
1040  * promiscuous mode, and all-multi behavior.
1041  **/
1042 
1043 static void
1044 ixgb_set_multi(struct net_device *netdev)
1045 {
1046     struct ixgb_adapter *adapter = netdev_priv(netdev);
1047     struct ixgb_hw *hw = &adapter->hw;
1048     struct netdev_hw_addr *ha;
1049     u32 rctl;
1050 
1051     /* Check for Promiscuous and All Multicast modes */
1052 
1053     rctl = IXGB_READ_REG(hw, RCTL);
1054 
1055     if (netdev->flags & IFF_PROMISC) {
1056         rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1057         /* disable VLAN filtering */
1058         rctl &= ~IXGB_RCTL_CFIEN;
1059         rctl &= ~IXGB_RCTL_VFE;
1060     } else {
1061         if (netdev->flags & IFF_ALLMULTI) {
1062             rctl |= IXGB_RCTL_MPE;
1063             rctl &= ~IXGB_RCTL_UPE;
1064         } else {
1065             rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1066         }
1067         /* enable VLAN filtering */
1068         rctl |= IXGB_RCTL_VFE;
1069         rctl &= ~IXGB_RCTL_CFIEN;
1070     }
1071 
1072     if (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1073         rctl |= IXGB_RCTL_MPE;
1074         IXGB_WRITE_REG(hw, RCTL, rctl);
1075     } else {
1076         u8 *mta = kmalloc_array(ETH_ALEN,
1077                         IXGB_MAX_NUM_MULTICAST_ADDRESSES,
1078                         GFP_ATOMIC);
1079         u8 *addr;
1080         if (!mta)
1081             goto alloc_failed;
1082 
1083         IXGB_WRITE_REG(hw, RCTL, rctl);
1084 
1085         addr = mta;
1086         netdev_for_each_mc_addr(ha, netdev) {
1087             memcpy(addr, ha->addr, ETH_ALEN);
1088             addr += ETH_ALEN;
1089         }
1090 
1091         ixgb_mc_addr_list_update(hw, mta, netdev_mc_count(netdev), 0);
1092         kfree(mta);
1093     }
1094 
1095 alloc_failed:
1096     if (netdev->features & NETIF_F_HW_VLAN_CTAG_RX)
1097         ixgb_vlan_strip_enable(adapter);
1098     else
1099         ixgb_vlan_strip_disable(adapter);
1100 
1101 }
1102 
1103 /**
1104  * ixgb_watchdog - Timer Call-back
1105  * @t: pointer to timer_list containing our private info pointer
1106  **/
1107 
1108 static void
1109 ixgb_watchdog(struct timer_list *t)
1110 {
1111     struct ixgb_adapter *adapter = from_timer(adapter, t, watchdog_timer);
1112     struct net_device *netdev = adapter->netdev;
1113     struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1114 
1115     ixgb_check_for_link(&adapter->hw);
1116 
1117     if (ixgb_check_for_bad_link(&adapter->hw)) {
1118         /* force the reset path */
1119         netif_stop_queue(netdev);
1120     }
1121 
1122     if (adapter->hw.link_up) {
1123         if (!netif_carrier_ok(netdev)) {
1124             netdev_info(netdev,
1125                     "NIC Link is Up 10 Gbps Full Duplex, Flow Control: %s\n",
1126                     (adapter->hw.fc.type == ixgb_fc_full) ?
1127                     "RX/TX" :
1128                     (adapter->hw.fc.type == ixgb_fc_rx_pause) ?
1129                      "RX" :
1130                     (adapter->hw.fc.type == ixgb_fc_tx_pause) ?
1131                     "TX" : "None");
1132             adapter->link_speed = 10000;
1133             adapter->link_duplex = FULL_DUPLEX;
1134             netif_carrier_on(netdev);
1135         }
1136     } else {
1137         if (netif_carrier_ok(netdev)) {
1138             adapter->link_speed = 0;
1139             adapter->link_duplex = 0;
1140             netdev_info(netdev, "NIC Link is Down\n");
1141             netif_carrier_off(netdev);
1142         }
1143     }
1144 
1145     ixgb_update_stats(adapter);
1146 
1147     if (!netif_carrier_ok(netdev)) {
1148         if (IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1149             /* We've lost link, so the controller stops DMA,
1150              * but we've got queued Tx work that's never going
1151              * to get done, so reset controller to flush Tx.
1152              * (Do the reset outside of interrupt context). */
1153             schedule_work(&adapter->tx_timeout_task);
1154             /* return immediately since reset is imminent */
1155             return;
1156         }
1157     }
1158 
1159     /* Force detection of hung controller every watchdog period */
1160     adapter->detect_tx_hung = true;
1161 
1162     /* generate an interrupt to force clean up of any stragglers */
1163     IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1164 
1165     /* Reset the timer */
1166     mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1167 }
1168 
1169 #define IXGB_TX_FLAGS_CSUM      0x00000001
1170 #define IXGB_TX_FLAGS_VLAN      0x00000002
1171 #define IXGB_TX_FLAGS_TSO       0x00000004
1172 
1173 static int
1174 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1175 {
1176     struct ixgb_context_desc *context_desc;
1177     unsigned int i;
1178     u8 ipcss, ipcso, tucss, tucso, hdr_len;
1179     u16 ipcse, tucse, mss;
1180 
1181     if (likely(skb_is_gso(skb))) {
1182         struct ixgb_buffer *buffer_info;
1183         struct iphdr *iph;
1184         int err;
1185 
1186         err = skb_cow_head(skb, 0);
1187         if (err < 0)
1188             return err;
1189 
1190         hdr_len = skb_tcp_all_headers(skb);
1191         mss = skb_shinfo(skb)->gso_size;
1192         iph = ip_hdr(skb);
1193         iph->tot_len = 0;
1194         iph->check = 0;
1195         tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
1196                              iph->daddr, 0,
1197                              IPPROTO_TCP, 0);
1198         ipcss = skb_network_offset(skb);
1199         ipcso = (void *)&(iph->check) - (void *)skb->data;
1200         ipcse = skb_transport_offset(skb) - 1;
1201         tucss = skb_transport_offset(skb);
1202         tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data;
1203         tucse = 0;
1204 
1205         i = adapter->tx_ring.next_to_use;
1206         context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1207         buffer_info = &adapter->tx_ring.buffer_info[i];
1208         WARN_ON(buffer_info->dma != 0);
1209 
1210         context_desc->ipcss = ipcss;
1211         context_desc->ipcso = ipcso;
1212         context_desc->ipcse = cpu_to_le16(ipcse);
1213         context_desc->tucss = tucss;
1214         context_desc->tucso = tucso;
1215         context_desc->tucse = cpu_to_le16(tucse);
1216         context_desc->mss = cpu_to_le16(mss);
1217         context_desc->hdr_len = hdr_len;
1218         context_desc->status = 0;
1219         context_desc->cmd_type_len = cpu_to_le32(
1220                           IXGB_CONTEXT_DESC_TYPE
1221                         | IXGB_CONTEXT_DESC_CMD_TSE
1222                         | IXGB_CONTEXT_DESC_CMD_IP
1223                         | IXGB_CONTEXT_DESC_CMD_TCP
1224                         | IXGB_CONTEXT_DESC_CMD_IDE
1225                         | (skb->len - (hdr_len)));
1226 
1227 
1228         if (++i == adapter->tx_ring.count) i = 0;
1229         adapter->tx_ring.next_to_use = i;
1230 
1231         return 1;
1232     }
1233 
1234     return 0;
1235 }
1236 
1237 static bool
1238 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1239 {
1240     struct ixgb_context_desc *context_desc;
1241     unsigned int i;
1242     u8 css, cso;
1243 
1244     if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
1245         struct ixgb_buffer *buffer_info;
1246         css = skb_checksum_start_offset(skb);
1247         cso = css + skb->csum_offset;
1248 
1249         i = adapter->tx_ring.next_to_use;
1250         context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1251         buffer_info = &adapter->tx_ring.buffer_info[i];
1252         WARN_ON(buffer_info->dma != 0);
1253 
1254         context_desc->tucss = css;
1255         context_desc->tucso = cso;
1256         context_desc->tucse = 0;
1257         /* zero out any previously existing data in one instruction */
1258         *(u32 *)&(context_desc->ipcss) = 0;
1259         context_desc->status = 0;
1260         context_desc->hdr_len = 0;
1261         context_desc->mss = 0;
1262         context_desc->cmd_type_len =
1263             cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1264                     | IXGB_TX_DESC_CMD_IDE);
1265 
1266         if (++i == adapter->tx_ring.count) i = 0;
1267         adapter->tx_ring.next_to_use = i;
1268 
1269         return true;
1270     }
1271 
1272     return false;
1273 }
1274 
1275 #define IXGB_MAX_TXD_PWR    14
1276 #define IXGB_MAX_DATA_PER_TXD   (1<<IXGB_MAX_TXD_PWR)
1277 
1278 static int
1279 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1280         unsigned int first)
1281 {
1282     struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1283     struct pci_dev *pdev = adapter->pdev;
1284     struct ixgb_buffer *buffer_info;
1285     int len = skb_headlen(skb);
1286     unsigned int offset = 0, size, count = 0, i;
1287     unsigned int mss = skb_shinfo(skb)->gso_size;
1288     unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1289     unsigned int f;
1290 
1291     i = tx_ring->next_to_use;
1292 
1293     while (len) {
1294         buffer_info = &tx_ring->buffer_info[i];
1295         size = min(len, IXGB_MAX_DATA_PER_TXD);
1296         /* Workaround for premature desc write-backs
1297          * in TSO mode.  Append 4-byte sentinel desc */
1298         if (unlikely(mss && !nr_frags && size == len && size > 8))
1299             size -= 4;
1300 
1301         buffer_info->length = size;
1302         WARN_ON(buffer_info->dma != 0);
1303         buffer_info->time_stamp = jiffies;
1304         buffer_info->mapped_as_page = false;
1305         buffer_info->dma = dma_map_single(&pdev->dev,
1306                           skb->data + offset,
1307                           size, DMA_TO_DEVICE);
1308         if (dma_mapping_error(&pdev->dev, buffer_info->dma))
1309             goto dma_error;
1310         buffer_info->next_to_watch = 0;
1311 
1312         len -= size;
1313         offset += size;
1314         count++;
1315         if (len) {
1316             i++;
1317             if (i == tx_ring->count)
1318                 i = 0;
1319         }
1320     }
1321 
1322     for (f = 0; f < nr_frags; f++) {
1323         const skb_frag_t *frag = &skb_shinfo(skb)->frags[f];
1324         len = skb_frag_size(frag);
1325         offset = 0;
1326 
1327         while (len) {
1328             i++;
1329             if (i == tx_ring->count)
1330                 i = 0;
1331 
1332             buffer_info = &tx_ring->buffer_info[i];
1333             size = min(len, IXGB_MAX_DATA_PER_TXD);
1334 
1335             /* Workaround for premature desc write-backs
1336              * in TSO mode.  Append 4-byte sentinel desc */
1337             if (unlikely(mss && (f == (nr_frags - 1))
1338                      && size == len && size > 8))
1339                 size -= 4;
1340 
1341             buffer_info->length = size;
1342             buffer_info->time_stamp = jiffies;
1343             buffer_info->mapped_as_page = true;
1344             buffer_info->dma =
1345                 skb_frag_dma_map(&pdev->dev, frag, offset, size,
1346                          DMA_TO_DEVICE);
1347             if (dma_mapping_error(&pdev->dev, buffer_info->dma))
1348                 goto dma_error;
1349             buffer_info->next_to_watch = 0;
1350 
1351             len -= size;
1352             offset += size;
1353             count++;
1354         }
1355     }
1356     tx_ring->buffer_info[i].skb = skb;
1357     tx_ring->buffer_info[first].next_to_watch = i;
1358 
1359     return count;
1360 
1361 dma_error:
1362     dev_err(&pdev->dev, "TX DMA map failed\n");
1363     buffer_info->dma = 0;
1364     if (count)
1365         count--;
1366 
1367     while (count--) {
1368         if (i==0)
1369             i += tx_ring->count;
1370         i--;
1371         buffer_info = &tx_ring->buffer_info[i];
1372         ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1373     }
1374 
1375     return 0;
1376 }
1377 
1378 static void
1379 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1380 {
1381     struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1382     struct ixgb_tx_desc *tx_desc = NULL;
1383     struct ixgb_buffer *buffer_info;
1384     u32 cmd_type_len = adapter->tx_cmd_type;
1385     u8 status = 0;
1386     u8 popts = 0;
1387     unsigned int i;
1388 
1389     if (tx_flags & IXGB_TX_FLAGS_TSO) {
1390         cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1391         popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1392     }
1393 
1394     if (tx_flags & IXGB_TX_FLAGS_CSUM)
1395         popts |= IXGB_TX_DESC_POPTS_TXSM;
1396 
1397     if (tx_flags & IXGB_TX_FLAGS_VLAN)
1398         cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1399 
1400     i = tx_ring->next_to_use;
1401 
1402     while (count--) {
1403         buffer_info = &tx_ring->buffer_info[i];
1404         tx_desc = IXGB_TX_DESC(*tx_ring, i);
1405         tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1406         tx_desc->cmd_type_len =
1407             cpu_to_le32(cmd_type_len | buffer_info->length);
1408         tx_desc->status = status;
1409         tx_desc->popts = popts;
1410         tx_desc->vlan = cpu_to_le16(vlan_id);
1411 
1412         if (++i == tx_ring->count) i = 0;
1413     }
1414 
1415     tx_desc->cmd_type_len |=
1416         cpu_to_le32(IXGB_TX_DESC_CMD_EOP | IXGB_TX_DESC_CMD_RS);
1417 
1418     /* Force memory writes to complete before letting h/w
1419      * know there are new descriptors to fetch.  (Only
1420      * applicable for weak-ordered memory model archs,
1421      * such as IA-64). */
1422     wmb();
1423 
1424     tx_ring->next_to_use = i;
1425     IXGB_WRITE_REG(&adapter->hw, TDT, i);
1426 }
1427 
1428 static int __ixgb_maybe_stop_tx(struct net_device *netdev, int size)
1429 {
1430     struct ixgb_adapter *adapter = netdev_priv(netdev);
1431     struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1432 
1433     netif_stop_queue(netdev);
1434     /* Herbert's original patch had:
1435      *  smp_mb__after_netif_stop_queue();
1436      * but since that doesn't exist yet, just open code it. */
1437     smp_mb();
1438 
1439     /* We need to check again in a case another CPU has just
1440      * made room available. */
1441     if (likely(IXGB_DESC_UNUSED(tx_ring) < size))
1442         return -EBUSY;
1443 
1444     /* A reprieve! */
1445     netif_start_queue(netdev);
1446     ++adapter->restart_queue;
1447     return 0;
1448 }
1449 
1450 static int ixgb_maybe_stop_tx(struct net_device *netdev,
1451                               struct ixgb_desc_ring *tx_ring, int size)
1452 {
1453     if (likely(IXGB_DESC_UNUSED(tx_ring) >= size))
1454         return 0;
1455     return __ixgb_maybe_stop_tx(netdev, size);
1456 }
1457 
1458 
1459 /* Tx Descriptors needed, worst case */
1460 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1461              (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1462 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) /* skb->date */ + \
1463     MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 /* for context */ \
1464     + 1 /* one more needed for sentinel TSO workaround */
1465 
1466 static netdev_tx_t
1467 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1468 {
1469     struct ixgb_adapter *adapter = netdev_priv(netdev);
1470     unsigned int first;
1471     unsigned int tx_flags = 0;
1472     int vlan_id = 0;
1473     int count = 0;
1474     int tso;
1475 
1476     if (test_bit(__IXGB_DOWN, &adapter->flags)) {
1477         dev_kfree_skb_any(skb);
1478         return NETDEV_TX_OK;
1479     }
1480 
1481     if (skb->len <= 0) {
1482         dev_kfree_skb_any(skb);
1483         return NETDEV_TX_OK;
1484     }
1485 
1486     if (unlikely(ixgb_maybe_stop_tx(netdev, &adapter->tx_ring,
1487                      DESC_NEEDED)))
1488         return NETDEV_TX_BUSY;
1489 
1490     if (skb_vlan_tag_present(skb)) {
1491         tx_flags |= IXGB_TX_FLAGS_VLAN;
1492         vlan_id = skb_vlan_tag_get(skb);
1493     }
1494 
1495     first = adapter->tx_ring.next_to_use;
1496 
1497     tso = ixgb_tso(adapter, skb);
1498     if (tso < 0) {
1499         dev_kfree_skb_any(skb);
1500         return NETDEV_TX_OK;
1501     }
1502 
1503     if (likely(tso))
1504         tx_flags |= IXGB_TX_FLAGS_TSO;
1505     else if (ixgb_tx_csum(adapter, skb))
1506         tx_flags |= IXGB_TX_FLAGS_CSUM;
1507 
1508     count = ixgb_tx_map(adapter, skb, first);
1509 
1510     if (count) {
1511         ixgb_tx_queue(adapter, count, vlan_id, tx_flags);
1512         /* Make sure there is space in the ring for the next send. */
1513         ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED);
1514 
1515     } else {
1516         dev_kfree_skb_any(skb);
1517         adapter->tx_ring.buffer_info[first].time_stamp = 0;
1518         adapter->tx_ring.next_to_use = first;
1519     }
1520 
1521     return NETDEV_TX_OK;
1522 }
1523 
1524 /**
1525  * ixgb_tx_timeout - Respond to a Tx Hang
1526  * @netdev: network interface device structure
1527  * @txqueue: queue hanging (unused)
1528  **/
1529 
1530 static void
1531 ixgb_tx_timeout(struct net_device *netdev, unsigned int __always_unused txqueue)
1532 {
1533     struct ixgb_adapter *adapter = netdev_priv(netdev);
1534 
1535     /* Do the reset outside of interrupt context */
1536     schedule_work(&adapter->tx_timeout_task);
1537 }
1538 
1539 static void
1540 ixgb_tx_timeout_task(struct work_struct *work)
1541 {
1542     struct ixgb_adapter *adapter =
1543         container_of(work, struct ixgb_adapter, tx_timeout_task);
1544 
1545     adapter->tx_timeout_count++;
1546     ixgb_down(adapter, true);
1547     ixgb_up(adapter);
1548 }
1549 
1550 /**
1551  * ixgb_change_mtu - Change the Maximum Transfer Unit
1552  * @netdev: network interface device structure
1553  * @new_mtu: new value for maximum frame size
1554  *
1555  * Returns 0 on success, negative on failure
1556  **/
1557 
1558 static int
1559 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1560 {
1561     struct ixgb_adapter *adapter = netdev_priv(netdev);
1562     int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1563 
1564     if (netif_running(netdev))
1565         ixgb_down(adapter, true);
1566 
1567     adapter->rx_buffer_len = max_frame + 8; /* + 8 for errata */
1568 
1569     netdev->mtu = new_mtu;
1570 
1571     if (netif_running(netdev))
1572         ixgb_up(adapter);
1573 
1574     return 0;
1575 }
1576 
1577 /**
1578  * ixgb_update_stats - Update the board statistics counters.
1579  * @adapter: board private structure
1580  **/
1581 
1582 void
1583 ixgb_update_stats(struct ixgb_adapter *adapter)
1584 {
1585     struct net_device *netdev = adapter->netdev;
1586     struct pci_dev *pdev = adapter->pdev;
1587 
1588     /* Prevent stats update while adapter is being reset */
1589     if (pci_channel_offline(pdev))
1590         return;
1591 
1592     if ((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1593        (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1594         u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1595         u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1596         u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1597         u64 bcast = ((u64)bcast_h << 32) | bcast_l;
1598 
1599         multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1600         /* fix up multicast stats by removing broadcasts */
1601         if (multi >= bcast)
1602             multi -= bcast;
1603 
1604         adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1605         adapter->stats.mprch += (multi >> 32);
1606         adapter->stats.bprcl += bcast_l;
1607         adapter->stats.bprch += bcast_h;
1608     } else {
1609         adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1610         adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1611         adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1612         adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1613     }
1614     adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1615     adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1616     adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1617     adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1618     adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1619     adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1620     adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1621     adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1622     adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1623     adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1624     adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1625     adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1626     adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1627     adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1628     adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1629     adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1630     adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1631     adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1632     adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1633     adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1634     adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1635     adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1636     adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1637     adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1638     adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1639     adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1640     adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1641     adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1642     adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1643     adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1644     adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1645     adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1646     adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1647     adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1648     adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1649     adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1650     adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1651     adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1652     adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1653     adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1654     adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1655     adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1656     adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1657     adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1658     adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1659     adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1660     adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1661     adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1662     adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1663     adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1664     adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1665     adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1666     adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1667     adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1668     adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1669     adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1670 
1671     /* Fill out the OS statistics structure */
1672 
1673     netdev->stats.rx_packets = adapter->stats.gprcl;
1674     netdev->stats.tx_packets = adapter->stats.gptcl;
1675     netdev->stats.rx_bytes = adapter->stats.gorcl;
1676     netdev->stats.tx_bytes = adapter->stats.gotcl;
1677     netdev->stats.multicast = adapter->stats.mprcl;
1678     netdev->stats.collisions = 0;
1679 
1680     /* ignore RLEC as it reports errors for padded (<64bytes) frames
1681      * with a length in the type/len field */
1682     netdev->stats.rx_errors =
1683         /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1684         adapter->stats.ruc +
1685         adapter->stats.roc /*+ adapter->stats.rlec */  +
1686         adapter->stats.icbc +
1687         adapter->stats.ecbc + adapter->stats.mpc;
1688 
1689     /* see above
1690      * netdev->stats.rx_length_errors = adapter->stats.rlec;
1691      */
1692 
1693     netdev->stats.rx_crc_errors = adapter->stats.crcerrs;
1694     netdev->stats.rx_fifo_errors = adapter->stats.mpc;
1695     netdev->stats.rx_missed_errors = adapter->stats.mpc;
1696     netdev->stats.rx_over_errors = adapter->stats.mpc;
1697 
1698     netdev->stats.tx_errors = 0;
1699     netdev->stats.rx_frame_errors = 0;
1700     netdev->stats.tx_aborted_errors = 0;
1701     netdev->stats.tx_carrier_errors = 0;
1702     netdev->stats.tx_fifo_errors = 0;
1703     netdev->stats.tx_heartbeat_errors = 0;
1704     netdev->stats.tx_window_errors = 0;
1705 }
1706 
1707 /**
1708  * ixgb_intr - Interrupt Handler
1709  * @irq: interrupt number
1710  * @data: pointer to a network interface device structure
1711  **/
1712 
1713 static irqreturn_t
1714 ixgb_intr(int irq, void *data)
1715 {
1716     struct net_device *netdev = data;
1717     struct ixgb_adapter *adapter = netdev_priv(netdev);
1718     struct ixgb_hw *hw = &adapter->hw;
1719     u32 icr = IXGB_READ_REG(hw, ICR);
1720 
1721     if (unlikely(!icr))
1722         return IRQ_NONE;  /* Not our interrupt */
1723 
1724     if (unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC)))
1725         if (!test_bit(__IXGB_DOWN, &adapter->flags))
1726             mod_timer(&adapter->watchdog_timer, jiffies);
1727 
1728     if (napi_schedule_prep(&adapter->napi)) {
1729 
1730         /* Disable interrupts and register for poll. The flush
1731           of the posted write is intentionally left out.
1732         */
1733 
1734         IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1735         __napi_schedule(&adapter->napi);
1736     }
1737     return IRQ_HANDLED;
1738 }
1739 
1740 /**
1741  * ixgb_clean - NAPI Rx polling callback
1742  * @napi: napi struct pointer
1743  * @budget: max number of receives to clean
1744  **/
1745 
1746 static int
1747 ixgb_clean(struct napi_struct *napi, int budget)
1748 {
1749     struct ixgb_adapter *adapter = container_of(napi, struct ixgb_adapter, napi);
1750     int work_done = 0;
1751 
1752     ixgb_clean_tx_irq(adapter);
1753     ixgb_clean_rx_irq(adapter, &work_done, budget);
1754 
1755     /* If budget not fully consumed, exit the polling mode */
1756     if (work_done < budget) {
1757         napi_complete_done(napi, work_done);
1758         if (!test_bit(__IXGB_DOWN, &adapter->flags))
1759             ixgb_irq_enable(adapter);
1760     }
1761 
1762     return work_done;
1763 }
1764 
1765 /**
1766  * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1767  * @adapter: board private structure
1768  **/
1769 
1770 static bool
1771 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1772 {
1773     struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1774     struct net_device *netdev = adapter->netdev;
1775     struct ixgb_tx_desc *tx_desc, *eop_desc;
1776     struct ixgb_buffer *buffer_info;
1777     unsigned int i, eop;
1778     bool cleaned = false;
1779 
1780     i = tx_ring->next_to_clean;
1781     eop = tx_ring->buffer_info[i].next_to_watch;
1782     eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1783 
1784     while (eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1785 
1786         rmb(); /* read buffer_info after eop_desc */
1787         for (cleaned = false; !cleaned; ) {
1788             tx_desc = IXGB_TX_DESC(*tx_ring, i);
1789             buffer_info = &tx_ring->buffer_info[i];
1790 
1791             if (tx_desc->popts &
1792                (IXGB_TX_DESC_POPTS_TXSM |
1793                 IXGB_TX_DESC_POPTS_IXSM))
1794                 adapter->hw_csum_tx_good++;
1795 
1796             ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1797 
1798             *(u32 *)&(tx_desc->status) = 0;
1799 
1800             cleaned = (i == eop);
1801             if (++i == tx_ring->count) i = 0;
1802         }
1803 
1804         eop = tx_ring->buffer_info[i].next_to_watch;
1805         eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1806     }
1807 
1808     tx_ring->next_to_clean = i;
1809 
1810     if (unlikely(cleaned && netif_carrier_ok(netdev) &&
1811              IXGB_DESC_UNUSED(tx_ring) >= DESC_NEEDED)) {
1812         /* Make sure that anybody stopping the queue after this
1813          * sees the new next_to_clean. */
1814         smp_mb();
1815 
1816         if (netif_queue_stopped(netdev) &&
1817             !(test_bit(__IXGB_DOWN, &adapter->flags))) {
1818             netif_wake_queue(netdev);
1819             ++adapter->restart_queue;
1820         }
1821     }
1822 
1823     if (adapter->detect_tx_hung) {
1824         /* detect a transmit hang in hardware, this serializes the
1825          * check with the clearing of time_stamp and movement of i */
1826         adapter->detect_tx_hung = false;
1827         if (tx_ring->buffer_info[eop].time_stamp &&
1828            time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ)
1829            && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1830                 IXGB_STATUS_TXOFF)) {
1831             /* detected Tx unit hang */
1832             netif_err(adapter, drv, adapter->netdev,
1833                   "Detected Tx Unit Hang\n"
1834                   "  TDH                  <%x>\n"
1835                   "  TDT                  <%x>\n"
1836                   "  next_to_use          <%x>\n"
1837                   "  next_to_clean        <%x>\n"
1838                   "buffer_info[next_to_clean]\n"
1839                   "  time_stamp           <%lx>\n"
1840                   "  next_to_watch        <%x>\n"
1841                   "  jiffies              <%lx>\n"
1842                   "  next_to_watch.status <%x>\n",
1843                   IXGB_READ_REG(&adapter->hw, TDH),
1844                   IXGB_READ_REG(&adapter->hw, TDT),
1845                   tx_ring->next_to_use,
1846                   tx_ring->next_to_clean,
1847                   tx_ring->buffer_info[eop].time_stamp,
1848                   eop,
1849                   jiffies,
1850                   eop_desc->status);
1851             netif_stop_queue(netdev);
1852         }
1853     }
1854 
1855     return cleaned;
1856 }
1857 
1858 /**
1859  * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1860  * @adapter: board private structure
1861  * @rx_desc: receive descriptor
1862  * @skb: socket buffer with received data
1863  **/
1864 
1865 static void
1866 ixgb_rx_checksum(struct ixgb_adapter *adapter,
1867                  struct ixgb_rx_desc *rx_desc,
1868                  struct sk_buff *skb)
1869 {
1870     /* Ignore Checksum bit is set OR
1871      * TCP Checksum has not been calculated
1872      */
1873     if ((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1874        (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1875         skb_checksum_none_assert(skb);
1876         return;
1877     }
1878 
1879     /* At this point we know the hardware did the TCP checksum */
1880     /* now look at the TCP checksum error bit */
1881     if (rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1882         /* let the stack verify checksum errors */
1883         skb_checksum_none_assert(skb);
1884         adapter->hw_csum_rx_error++;
1885     } else {
1886         /* TCP checksum is good */
1887         skb->ip_summed = CHECKSUM_UNNECESSARY;
1888         adapter->hw_csum_rx_good++;
1889     }
1890 }
1891 
1892 /*
1893  * this should improve performance for small packets with large amounts
1894  * of reassembly being done in the stack
1895  */
1896 static void ixgb_check_copybreak(struct napi_struct *napi,
1897                  struct ixgb_buffer *buffer_info,
1898                  u32 length, struct sk_buff **skb)
1899 {
1900     struct sk_buff *new_skb;
1901 
1902     if (length > copybreak)
1903         return;
1904 
1905     new_skb = napi_alloc_skb(napi, length);
1906     if (!new_skb)
1907         return;
1908 
1909     skb_copy_to_linear_data_offset(new_skb, -NET_IP_ALIGN,
1910                        (*skb)->data - NET_IP_ALIGN,
1911                        length + NET_IP_ALIGN);
1912     /* save the skb in buffer_info as good */
1913     buffer_info->skb = *skb;
1914     *skb = new_skb;
1915 }
1916 
1917 /**
1918  * ixgb_clean_rx_irq - Send received data up the network stack,
1919  * @adapter: board private structure
1920  * @work_done: output pointer to amount of packets cleaned
1921  * @work_to_do: how much work we can complete
1922  **/
1923 
1924 static bool
1925 ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
1926 {
1927     struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1928     struct net_device *netdev = adapter->netdev;
1929     struct pci_dev *pdev = adapter->pdev;
1930     struct ixgb_rx_desc *rx_desc, *next_rxd;
1931     struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
1932     u32 length;
1933     unsigned int i, j;
1934     int cleaned_count = 0;
1935     bool cleaned = false;
1936 
1937     i = rx_ring->next_to_clean;
1938     rx_desc = IXGB_RX_DESC(*rx_ring, i);
1939     buffer_info = &rx_ring->buffer_info[i];
1940 
1941     while (rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
1942         struct sk_buff *skb;
1943         u8 status;
1944 
1945         if (*work_done >= work_to_do)
1946             break;
1947 
1948         (*work_done)++;
1949         rmb();  /* read descriptor and rx_buffer_info after status DD */
1950         status = rx_desc->status;
1951         skb = buffer_info->skb;
1952         buffer_info->skb = NULL;
1953 
1954         prefetch(skb->data - NET_IP_ALIGN);
1955 
1956         if (++i == rx_ring->count)
1957             i = 0;
1958         next_rxd = IXGB_RX_DESC(*rx_ring, i);
1959         prefetch(next_rxd);
1960 
1961         j = i + 1;
1962         if (j == rx_ring->count)
1963             j = 0;
1964         next2_buffer = &rx_ring->buffer_info[j];
1965         prefetch(next2_buffer);
1966 
1967         next_buffer = &rx_ring->buffer_info[i];
1968 
1969         cleaned = true;
1970         cleaned_count++;
1971 
1972         dma_unmap_single(&pdev->dev,
1973                  buffer_info->dma,
1974                  buffer_info->length,
1975                  DMA_FROM_DEVICE);
1976         buffer_info->dma = 0;
1977 
1978         length = le16_to_cpu(rx_desc->length);
1979         rx_desc->length = 0;
1980 
1981         if (unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
1982 
1983             /* All receives must fit into a single buffer */
1984 
1985             pr_debug("Receive packet consumed multiple buffers length<%x>\n",
1986                  length);
1987 
1988             dev_kfree_skb_irq(skb);
1989             goto rxdesc_done;
1990         }
1991 
1992         if (unlikely(rx_desc->errors &
1993             (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE |
1994              IXGB_RX_DESC_ERRORS_P | IXGB_RX_DESC_ERRORS_RXE))) {
1995             dev_kfree_skb_irq(skb);
1996             goto rxdesc_done;
1997         }
1998 
1999         ixgb_check_copybreak(&adapter->napi, buffer_info, length, &skb);
2000 
2001         /* Good Receive */
2002         skb_put(skb, length);
2003 
2004         /* Receive Checksum Offload */
2005         ixgb_rx_checksum(adapter, rx_desc, skb);
2006 
2007         skb->protocol = eth_type_trans(skb, netdev);
2008         if (status & IXGB_RX_DESC_STATUS_VP)
2009             __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
2010                        le16_to_cpu(rx_desc->special));
2011 
2012         netif_receive_skb(skb);
2013 
2014 rxdesc_done:
2015         /* clean up descriptor, might be written over by hw */
2016         rx_desc->status = 0;
2017 
2018         /* return some buffers to hardware, one at a time is too slow */
2019         if (unlikely(cleaned_count >= IXGB_RX_BUFFER_WRITE)) {
2020             ixgb_alloc_rx_buffers(adapter, cleaned_count);
2021             cleaned_count = 0;
2022         }
2023 
2024         /* use prefetched values */
2025         rx_desc = next_rxd;
2026         buffer_info = next_buffer;
2027     }
2028 
2029     rx_ring->next_to_clean = i;
2030 
2031     cleaned_count = IXGB_DESC_UNUSED(rx_ring);
2032     if (cleaned_count)
2033         ixgb_alloc_rx_buffers(adapter, cleaned_count);
2034 
2035     return cleaned;
2036 }
2037 
2038 /**
2039  * ixgb_alloc_rx_buffers - Replace used receive buffers
2040  * @adapter: address of board private structure
2041  * @cleaned_count: how many buffers to allocate
2042  **/
2043 
2044 static void
2045 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter, int cleaned_count)
2046 {
2047     struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2048     struct net_device *netdev = adapter->netdev;
2049     struct pci_dev *pdev = adapter->pdev;
2050     struct ixgb_rx_desc *rx_desc;
2051     struct ixgb_buffer *buffer_info;
2052     struct sk_buff *skb;
2053     unsigned int i;
2054     long cleancount;
2055 
2056     i = rx_ring->next_to_use;
2057     buffer_info = &rx_ring->buffer_info[i];
2058     cleancount = IXGB_DESC_UNUSED(rx_ring);
2059 
2060 
2061     /* leave three descriptors unused */
2062     while (--cleancount > 2 && cleaned_count--) {
2063         /* recycle! its good for you */
2064         skb = buffer_info->skb;
2065         if (skb) {
2066             skb_trim(skb, 0);
2067             goto map_skb;
2068         }
2069 
2070         skb = netdev_alloc_skb_ip_align(netdev, adapter->rx_buffer_len);
2071         if (unlikely(!skb)) {
2072             /* Better luck next round */
2073             adapter->alloc_rx_buff_failed++;
2074             break;
2075         }
2076 
2077         buffer_info->skb = skb;
2078         buffer_info->length = adapter->rx_buffer_len;
2079 map_skb:
2080         buffer_info->dma = dma_map_single(&pdev->dev,
2081                                           skb->data,
2082                                           adapter->rx_buffer_len,
2083                           DMA_FROM_DEVICE);
2084         if (dma_mapping_error(&pdev->dev, buffer_info->dma)) {
2085             adapter->alloc_rx_buff_failed++;
2086             break;
2087         }
2088 
2089         rx_desc = IXGB_RX_DESC(*rx_ring, i);
2090         rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
2091         /* guarantee DD bit not set now before h/w gets descriptor
2092          * this is the rest of the workaround for h/w double
2093          * writeback. */
2094         rx_desc->status = 0;
2095 
2096 
2097         if (++i == rx_ring->count)
2098             i = 0;
2099         buffer_info = &rx_ring->buffer_info[i];
2100     }
2101 
2102     if (likely(rx_ring->next_to_use != i)) {
2103         rx_ring->next_to_use = i;
2104         if (unlikely(i-- == 0))
2105             i = (rx_ring->count - 1);
2106 
2107         /* Force memory writes to complete before letting h/w
2108          * know there are new descriptors to fetch.  (Only
2109          * applicable for weak-ordered memory model archs, such
2110          * as IA-64). */
2111         wmb();
2112         IXGB_WRITE_REG(&adapter->hw, RDT, i);
2113     }
2114 }
2115 
2116 static void
2117 ixgb_vlan_strip_enable(struct ixgb_adapter *adapter)
2118 {
2119     u32 ctrl;
2120 
2121     /* enable VLAN tag insert/strip */
2122     ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2123     ctrl |= IXGB_CTRL0_VME;
2124     IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2125 }
2126 
2127 static void
2128 ixgb_vlan_strip_disable(struct ixgb_adapter *adapter)
2129 {
2130     u32 ctrl;
2131 
2132     /* disable VLAN tag insert/strip */
2133     ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2134     ctrl &= ~IXGB_CTRL0_VME;
2135     IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2136 }
2137 
2138 static int
2139 ixgb_vlan_rx_add_vid(struct net_device *netdev, __be16 proto, u16 vid)
2140 {
2141     struct ixgb_adapter *adapter = netdev_priv(netdev);
2142     u32 vfta, index;
2143 
2144     /* add VID to filter table */
2145 
2146     index = (vid >> 5) & 0x7F;
2147     vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2148     vfta |= (1 << (vid & 0x1F));
2149     ixgb_write_vfta(&adapter->hw, index, vfta);
2150     set_bit(vid, adapter->active_vlans);
2151 
2152     return 0;
2153 }
2154 
2155 static int
2156 ixgb_vlan_rx_kill_vid(struct net_device *netdev, __be16 proto, u16 vid)
2157 {
2158     struct ixgb_adapter *adapter = netdev_priv(netdev);
2159     u32 vfta, index;
2160 
2161     /* remove VID from filter table */
2162 
2163     index = (vid >> 5) & 0x7F;
2164     vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2165     vfta &= ~(1 << (vid & 0x1F));
2166     ixgb_write_vfta(&adapter->hw, index, vfta);
2167     clear_bit(vid, adapter->active_vlans);
2168 
2169     return 0;
2170 }
2171 
2172 static void
2173 ixgb_restore_vlan(struct ixgb_adapter *adapter)
2174 {
2175     u16 vid;
2176 
2177     for_each_set_bit(vid, adapter->active_vlans, VLAN_N_VID)
2178         ixgb_vlan_rx_add_vid(adapter->netdev, htons(ETH_P_8021Q), vid);
2179 }
2180 
2181 /**
2182  * ixgb_io_error_detected - called when PCI error is detected
2183  * @pdev:    pointer to pci device with error
2184  * @state:   pci channel state after error
2185  *
2186  * This callback is called by the PCI subsystem whenever
2187  * a PCI bus error is detected.
2188  */
2189 static pci_ers_result_t ixgb_io_error_detected(struct pci_dev *pdev,
2190                                                pci_channel_state_t state)
2191 {
2192     struct net_device *netdev = pci_get_drvdata(pdev);
2193     struct ixgb_adapter *adapter = netdev_priv(netdev);
2194 
2195     netif_device_detach(netdev);
2196 
2197     if (state == pci_channel_io_perm_failure)
2198         return PCI_ERS_RESULT_DISCONNECT;
2199 
2200     if (netif_running(netdev))
2201         ixgb_down(adapter, true);
2202 
2203     pci_disable_device(pdev);
2204 
2205     /* Request a slot reset. */
2206     return PCI_ERS_RESULT_NEED_RESET;
2207 }
2208 
2209 /**
2210  * ixgb_io_slot_reset - called after the pci bus has been reset.
2211  * @pdev: pointer to pci device with error
2212  *
2213  * This callback is called after the PCI bus has been reset.
2214  * Basically, this tries to restart the card from scratch.
2215  * This is a shortened version of the device probe/discovery code,
2216  * it resembles the first-half of the ixgb_probe() routine.
2217  */
2218 static pci_ers_result_t ixgb_io_slot_reset(struct pci_dev *pdev)
2219 {
2220     struct net_device *netdev = pci_get_drvdata(pdev);
2221     struct ixgb_adapter *adapter = netdev_priv(netdev);
2222     u8 addr[ETH_ALEN];
2223 
2224     if (pci_enable_device(pdev)) {
2225         netif_err(adapter, probe, adapter->netdev,
2226               "Cannot re-enable PCI device after reset\n");
2227         return PCI_ERS_RESULT_DISCONNECT;
2228     }
2229 
2230     /* Perform card reset only on one instance of the card */
2231     if (0 != PCI_FUNC (pdev->devfn))
2232         return PCI_ERS_RESULT_RECOVERED;
2233 
2234     pci_set_master(pdev);
2235 
2236     netif_carrier_off(netdev);
2237     netif_stop_queue(netdev);
2238     ixgb_reset(adapter);
2239 
2240     /* Make sure the EEPROM is good */
2241     if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
2242         netif_err(adapter, probe, adapter->netdev,
2243               "After reset, the EEPROM checksum is not valid\n");
2244         return PCI_ERS_RESULT_DISCONNECT;
2245     }
2246     ixgb_get_ee_mac_addr(&adapter->hw, addr);
2247     eth_hw_addr_set(netdev, addr);
2248     memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
2249 
2250     if (!is_valid_ether_addr(netdev->perm_addr)) {
2251         netif_err(adapter, probe, adapter->netdev,
2252               "After reset, invalid MAC address\n");
2253         return PCI_ERS_RESULT_DISCONNECT;
2254     }
2255 
2256     return PCI_ERS_RESULT_RECOVERED;
2257 }
2258 
2259 /**
2260  * ixgb_io_resume - called when its OK to resume normal operations
2261  * @pdev: pointer to pci device with error
2262  *
2263  * The error recovery driver tells us that its OK to resume
2264  * normal operation. Implementation resembles the second-half
2265  * of the ixgb_probe() routine.
2266  */
2267 static void ixgb_io_resume(struct pci_dev *pdev)
2268 {
2269     struct net_device *netdev = pci_get_drvdata(pdev);
2270     struct ixgb_adapter *adapter = netdev_priv(netdev);
2271 
2272     pci_set_master(pdev);
2273 
2274     if (netif_running(netdev)) {
2275         if (ixgb_up(adapter)) {
2276             pr_err("can't bring device back up after reset\n");
2277             return;
2278         }
2279     }
2280 
2281     netif_device_attach(netdev);
2282     mod_timer(&adapter->watchdog_timer, jiffies);
2283 }
2284 
2285 /* ixgb_main.c */
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