1// SPDX-License-Identifier: GPL-2.0
   2/* Copyright(c) 1999 - 2008 Intel Corporation. */
   3
   4#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   5
   6#include <linux/prefetch.h>
   7#include "ixgb.h"
   8
   9char ixgb_driver_name[] = "ixgb";
  10static char ixgb_driver_string[] = "Intel(R) PRO/10GbE Network Driver";
  11
  12static const char ixgb_copyright[] = "Copyright (c) 1999-2008 Intel Corporation.";
  13
  14#define IXGB_CB_LENGTH 256
  15static unsigned int copybreak __read_mostly = IXGB_CB_LENGTH;
  16module_param(copybreak, uint, 0644);
  17MODULE_PARM_DESC(copybreak,
  18	"Maximum size of packet that is copied to a new buffer on receive");
  19
  20/* ixgb_pci_tbl - PCI Device ID Table
  21 *
  22 * Wildcard entries (PCI_ANY_ID) should come last
  23 * Last entry must be all 0s
  24 *
  25 * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
  26 *   Class, Class Mask, private data (not used) }
  27 */
  28static const struct pci_device_id ixgb_pci_tbl[] = {
  29	{PCI_VENDOR_ID_INTEL, IXGB_DEVICE_ID_82597EX,
  30	 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  31	{PCI_VENDOR_ID_INTEL, IXGB_DEVICE_ID_82597EX_CX4,
  32	 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  33	{PCI_VENDOR_ID_INTEL, IXGB_DEVICE_ID_82597EX_SR,
  34	 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  35	{PCI_VENDOR_ID_INTEL, IXGB_DEVICE_ID_82597EX_LR,
  36	 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  37
  38	/* required last entry */
  39	{0,}
  40};
  41
  42MODULE_DEVICE_TABLE(pci, ixgb_pci_tbl);
  43
  44/* Local Function Prototypes */
  45static int ixgb_init_module(void);
  46static void ixgb_exit_module(void);
  47static int ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
  48static void ixgb_remove(struct pci_dev *pdev);
  49static int ixgb_sw_init(struct ixgb_adapter *adapter);
  50static int ixgb_open(struct net_device *netdev);
  51static int ixgb_close(struct net_device *netdev);
  52static void ixgb_configure_tx(struct ixgb_adapter *adapter);
  53static void ixgb_configure_rx(struct ixgb_adapter *adapter);
  54static void ixgb_setup_rctl(struct ixgb_adapter *adapter);
  55static void ixgb_clean_tx_ring(struct ixgb_adapter *adapter);
  56static void ixgb_clean_rx_ring(struct ixgb_adapter *adapter);
  57static void ixgb_set_multi(struct net_device *netdev);
  58static void ixgb_watchdog(struct timer_list *t);
  59static netdev_tx_t ixgb_xmit_frame(struct sk_buff *skb,
  60				   struct net_device *netdev);
  61static int ixgb_change_mtu(struct net_device *netdev, int new_mtu);
  62static int ixgb_set_mac(struct net_device *netdev, void *p);
  63static irqreturn_t ixgb_intr(int irq, void *data);
  64static bool ixgb_clean_tx_irq(struct ixgb_adapter *adapter);
  65
  66static int ixgb_clean(struct napi_struct *, int);
  67static bool ixgb_clean_rx_irq(struct ixgb_adapter *, int *, int);
  68static void ixgb_alloc_rx_buffers(struct ixgb_adapter *, int);
  69
  70static void ixgb_tx_timeout(struct net_device *dev, unsigned int txqueue);
  71static void ixgb_tx_timeout_task(struct work_struct *work);
  72
  73static void ixgb_vlan_strip_enable(struct ixgb_adapter *adapter);
  74static void ixgb_vlan_strip_disable(struct ixgb_adapter *adapter);
  75static int ixgb_vlan_rx_add_vid(struct net_device *netdev,
  76				__be16 proto, u16 vid);
  77static int ixgb_vlan_rx_kill_vid(struct net_device *netdev,
  78				 __be16 proto, u16 vid);
  79static void ixgb_restore_vlan(struct ixgb_adapter *adapter);
  80
  81static pci_ers_result_t ixgb_io_error_detected (struct pci_dev *pdev,
  82                             pci_channel_state_t state);
  83static pci_ers_result_t ixgb_io_slot_reset (struct pci_dev *pdev);
  84static void ixgb_io_resume (struct pci_dev *pdev);
  85
  86static const struct pci_error_handlers ixgb_err_handler = {
  87	.error_detected = ixgb_io_error_detected,
  88	.slot_reset = ixgb_io_slot_reset,
  89	.resume = ixgb_io_resume,
  90};
  91
  92static struct pci_driver ixgb_driver = {
  93	.name     = ixgb_driver_name,
  94	.id_table = ixgb_pci_tbl,
  95	.probe    = ixgb_probe,
  96	.remove   = ixgb_remove,
  97	.err_handler = &ixgb_err_handler
  98};
  99
 100MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
 101MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver");
 102MODULE_LICENSE("GPL v2");
 103
 104#define DEFAULT_MSG_ENABLE (NETIF_MSG_DRV|NETIF_MSG_PROBE|NETIF_MSG_LINK)
 105static int debug = -1;
 106module_param(debug, int, 0);
 107MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
 108
 109/**
 110 * ixgb_init_module - Driver Registration Routine
 111 *
 112 * ixgb_init_module is the first routine called when the driver is
 113 * loaded. All it does is register with the PCI subsystem.
 114 **/
 115
 116static int __init
 117ixgb_init_module(void)
 118{
 119	pr_info("%s\n", ixgb_driver_string);
 120	pr_info("%s\n", ixgb_copyright);
 121
 122	return pci_register_driver(&ixgb_driver);
 123}
 124
 125module_init(ixgb_init_module);
 126
 127/**
 128 * ixgb_exit_module - Driver Exit Cleanup Routine
 129 *
 130 * ixgb_exit_module is called just before the driver is removed
 131 * from memory.
 132 **/
 133
 134static void __exit
 135ixgb_exit_module(void)
 136{
 137	pci_unregister_driver(&ixgb_driver);
 138}
 139
 140module_exit(ixgb_exit_module);
 141
 142/**
 143 * ixgb_irq_disable - Mask off interrupt generation on the NIC
 144 * @adapter: board private structure
 145 **/
 146
 147static void
 148ixgb_irq_disable(struct ixgb_adapter *adapter)
 149{
 150	IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
 151	IXGB_WRITE_FLUSH(&adapter->hw);
 152	synchronize_irq(adapter->pdev->irq);
 153}
 154
 155/**
 156 * ixgb_irq_enable - Enable default interrupt generation settings
 157 * @adapter: board private structure
 158 **/
 159
 160static void
 161ixgb_irq_enable(struct ixgb_adapter *adapter)
 162{
 163	u32 val = IXGB_INT_RXT0 | IXGB_INT_RXDMT0 |
 164		  IXGB_INT_TXDW | IXGB_INT_LSC;
 165	if (adapter->hw.subsystem_vendor_id == PCI_VENDOR_ID_SUN)
 166		val |= IXGB_INT_GPI0;
 167	IXGB_WRITE_REG(&adapter->hw, IMS, val);
 168	IXGB_WRITE_FLUSH(&adapter->hw);
 169}
 170
 171int
 172ixgb_up(struct ixgb_adapter *adapter)
 173{
 174	struct net_device *netdev = adapter->netdev;
 175	int err, irq_flags = IRQF_SHARED;
 176	int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
 177	struct ixgb_hw *hw = &adapter->hw;
 178
 179	/* hardware has been reset, we need to reload some things */
 180
 181	ixgb_rar_set(hw, netdev->dev_addr, 0);
 182	ixgb_set_multi(netdev);
 183
 184	ixgb_restore_vlan(adapter);
 185
 186	ixgb_configure_tx(adapter);
 187	ixgb_setup_rctl(adapter);
 188	ixgb_configure_rx(adapter);
 189	ixgb_alloc_rx_buffers(adapter, IXGB_DESC_UNUSED(&adapter->rx_ring));
 190
 191	/* disable interrupts and get the hardware into a known state */
 192	IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);
 193
 194	/* only enable MSI if bus is in PCI-X mode */
 195	if (IXGB_READ_REG(&adapter->hw, STATUS) & IXGB_STATUS_PCIX_MODE) {
 196		err = pci_enable_msi(adapter->pdev);
 197		if (!err) {
 198			adapter->have_msi = true;
 199			irq_flags = 0;
 200		}
 201		/* proceed to try to request regular interrupt */
 202	}
 203
 204	err = request_irq(adapter->pdev->irq, ixgb_intr, irq_flags,
 205	                  netdev->name, netdev);
 206	if (err) {
 207		if (adapter->have_msi)
 208			pci_disable_msi(adapter->pdev);
 209		netif_err(adapter, probe, adapter->netdev,
 210			  "Unable to allocate interrupt Error: %d\n", err);
 211		return err;
 212	}
 213
 214	if ((hw->max_frame_size != max_frame) ||
 215		(hw->max_frame_size !=
 216		(IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {
 217
 218		hw->max_frame_size = max_frame;
 219
 220		IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
 221
 222		if (hw->max_frame_size >
 223		   IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
 224			u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
 225
 226			if (!(ctrl0 & IXGB_CTRL0_JFE)) {
 227				ctrl0 |= IXGB_CTRL0_JFE;
 228				IXGB_WRITE_REG(hw, CTRL0, ctrl0);
 229			}
 230		}
 231	}
 232
 233	clear_bit(__IXGB_DOWN, &adapter->flags);
 234
 235	napi_enable(&adapter->napi);
 236	ixgb_irq_enable(adapter);
 237
 238	netif_wake_queue(netdev);
 239
 240	mod_timer(&adapter->watchdog_timer, jiffies);
 241
 242	return 0;
 243}
 244
 245void
 246ixgb_down(struct ixgb_adapter *adapter, bool kill_watchdog)
 247{
 248	struct net_device *netdev = adapter->netdev;
 249
 250	/* prevent the interrupt handler from restarting watchdog */
 251	set_bit(__IXGB_DOWN, &adapter->flags);
 252
 253	netif_carrier_off(netdev);
 254
 255	napi_disable(&adapter->napi);
 256	/* waiting for NAPI to complete can re-enable interrupts */
 257	ixgb_irq_disable(adapter);
 258	free_irq(adapter->pdev->irq, netdev);
 259
 260	if (adapter->have_msi)
 261		pci_disable_msi(adapter->pdev);
 262
 263	if (kill_watchdog)
 264		del_timer_sync(&adapter->watchdog_timer);
 265
 266	adapter->link_speed = 0;
 267	adapter->link_duplex = 0;
 268	netif_stop_queue(netdev);
 269
 270	ixgb_reset(adapter);
 271	ixgb_clean_tx_ring(adapter);
 272	ixgb_clean_rx_ring(adapter);
 273}
 274
 275void
 276ixgb_reset(struct ixgb_adapter *adapter)
 277{
 278	struct ixgb_hw *hw = &adapter->hw;
 279
 280	ixgb_adapter_stop(hw);
 281	if (!ixgb_init_hw(hw))
 282		netif_err(adapter, probe, adapter->netdev, "ixgb_init_hw failed\n");
 283
 284	/* restore frame size information */
 285	IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
 286	if (hw->max_frame_size >
 287	    IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
 288		u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
 289		if (!(ctrl0 & IXGB_CTRL0_JFE)) {
 290			ctrl0 |= IXGB_CTRL0_JFE;
 291			IXGB_WRITE_REG(hw, CTRL0, ctrl0);
 292		}
 293	}
 294}
 295
 296static netdev_features_t
 297ixgb_fix_features(struct net_device *netdev, netdev_features_t features)
 298{
 299	/*
 300	 * Tx VLAN insertion does not work per HW design when Rx stripping is
 301	 * disabled.
 302	 */
 303	if (!(features & NETIF_F_HW_VLAN_CTAG_RX))
 304		features &= ~NETIF_F_HW_VLAN_CTAG_TX;
 305
 306	return features;
 307}
 308
 309static int
 310ixgb_set_features(struct net_device *netdev, netdev_features_t features)
 311{
 312	struct ixgb_adapter *adapter = netdev_priv(netdev);
 313	netdev_features_t changed = features ^ netdev->features;
 314
 315	if (!(changed & (NETIF_F_RXCSUM|NETIF_F_HW_VLAN_CTAG_RX)))
 316		return 0;
 317
 318	adapter->rx_csum = !!(features & NETIF_F_RXCSUM);
 319
 320	if (netif_running(netdev)) {
 321		ixgb_down(adapter, true);
 322		ixgb_up(adapter);
 323		ixgb_set_speed_duplex(netdev);
 324	} else
 325		ixgb_reset(adapter);
 326
 327	return 0;
 328}
 329
 330
 331static const struct net_device_ops ixgb_netdev_ops = {
 332	.ndo_open 		= ixgb_open,
 333	.ndo_stop		= ixgb_close,
 334	.ndo_start_xmit		= ixgb_xmit_frame,
 335	.ndo_set_rx_mode	= ixgb_set_multi,
 336	.ndo_validate_addr	= eth_validate_addr,
 337	.ndo_set_mac_address	= ixgb_set_mac,
 338	.ndo_change_mtu		= ixgb_change_mtu,
 339	.ndo_tx_timeout		= ixgb_tx_timeout,
 340	.ndo_vlan_rx_add_vid	= ixgb_vlan_rx_add_vid,
 341	.ndo_vlan_rx_kill_vid	= ixgb_vlan_rx_kill_vid,
 342	.ndo_fix_features       = ixgb_fix_features,
 343	.ndo_set_features       = ixgb_set_features,
 344};
 345
 346/**
 347 * ixgb_probe - Device Initialization Routine
 348 * @pdev: PCI device information struct
 349 * @ent: entry in ixgb_pci_tbl
 350 *
 351 * Returns 0 on success, negative on failure
 352 *
 353 * ixgb_probe initializes an adapter identified by a pci_dev structure.
 354 * The OS initialization, configuring of the adapter private structure,
 355 * and a hardware reset occur.
 356 **/
 357
 358static int
 359ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 360{
 361	struct net_device *netdev = NULL;
 362	struct ixgb_adapter *adapter;
 363	static int cards_found = 0;
 364	u8 addr[ETH_ALEN];
 365	int i;
 366	int err;
 367
 368	err = pci_enable_device(pdev);
 369	if (err)
 370		return err;
 371
 
 372	err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
 373	if (err) {
 374		pr_err("No usable DMA configuration, aborting\n");
 375		goto err_dma_mask;
 
 
 
 
 
 376	}
 377
 378	err = pci_request_regions(pdev, ixgb_driver_name);
 379	if (err)
 380		goto err_request_regions;
 381
 382	pci_set_master(pdev);
 383
 384	netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
 385	if (!netdev) {
 386		err = -ENOMEM;
 387		goto err_alloc_etherdev;
 388	}
 389
 390	SET_NETDEV_DEV(netdev, &pdev->dev);
 391
 392	pci_set_drvdata(pdev, netdev);
 393	adapter = netdev_priv(netdev);
 394	adapter->netdev = netdev;
 395	adapter->pdev = pdev;
 396	adapter->hw.back = adapter;
 397	adapter->msg_enable = netif_msg_init(debug, DEFAULT_MSG_ENABLE);
 398
 399	adapter->hw.hw_addr = pci_ioremap_bar(pdev, BAR_0);
 400	if (!adapter->hw.hw_addr) {
 401		err = -EIO;
 402		goto err_ioremap;
 403	}
 404
 405	for (i = BAR_1; i < PCI_STD_NUM_BARS; i++) {
 406		if (pci_resource_len(pdev, i) == 0)
 407			continue;
 408		if (pci_resource_flags(pdev, i) & IORESOURCE_IO) {
 409			adapter->hw.io_base = pci_resource_start(pdev, i);
 410			break;
 411		}
 412	}
 413
 414	netdev->netdev_ops = &ixgb_netdev_ops;
 415	ixgb_set_ethtool_ops(netdev);
 416	netdev->watchdog_timeo = 5 * HZ;
 417	netif_napi_add(netdev, &adapter->napi, ixgb_clean);
 418
 419	strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
 420
 421	adapter->bd_number = cards_found;
 422	adapter->link_speed = 0;
 423	adapter->link_duplex = 0;
 424
 425	/* setup the private structure */
 426
 427	err = ixgb_sw_init(adapter);
 428	if (err)
 429		goto err_sw_init;
 430
 431	netdev->hw_features = NETIF_F_SG |
 432			   NETIF_F_TSO |
 433			   NETIF_F_HW_CSUM |
 434			   NETIF_F_HW_VLAN_CTAG_TX |
 435			   NETIF_F_HW_VLAN_CTAG_RX;
 436	netdev->features = netdev->hw_features |
 437			   NETIF_F_HW_VLAN_CTAG_FILTER;
 438	netdev->hw_features |= NETIF_F_RXCSUM;
 439
 440	netdev->features |= NETIF_F_HIGHDMA;
 441	netdev->vlan_features |= NETIF_F_HIGHDMA;
 
 
 442
 443	/* MTU range: 68 - 16114 */
 444	netdev->min_mtu = ETH_MIN_MTU;
 445	netdev->max_mtu = IXGB_MAX_JUMBO_FRAME_SIZE - ETH_HLEN;
 446
 447	/* make sure the EEPROM is good */
 448
 449	if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
 450		netif_err(adapter, probe, adapter->netdev,
 451			  "The EEPROM Checksum Is Not Valid\n");
 452		err = -EIO;
 453		goto err_eeprom;
 454	}
 455
 456	ixgb_get_ee_mac_addr(&adapter->hw, addr);
 457	eth_hw_addr_set(netdev, addr);
 458
 459	if (!is_valid_ether_addr(netdev->dev_addr)) {
 460		netif_err(adapter, probe, adapter->netdev, "Invalid MAC Address\n");
 461		err = -EIO;
 462		goto err_eeprom;
 463	}
 464
 465	adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
 466
 467	timer_setup(&adapter->watchdog_timer, ixgb_watchdog, 0);
 468
 469	INIT_WORK(&adapter->tx_timeout_task, ixgb_tx_timeout_task);
 470
 471	strcpy(netdev->name, "eth%d");
 472	err = register_netdev(netdev);
 473	if (err)
 474		goto err_register;
 475
 476	/* carrier off reporting is important to ethtool even BEFORE open */
 477	netif_carrier_off(netdev);
 478
 479	netif_info(adapter, probe, adapter->netdev,
 480		   "Intel(R) PRO/10GbE Network Connection\n");
 481	ixgb_check_options(adapter);
 482	/* reset the hardware with the new settings */
 483
 484	ixgb_reset(adapter);
 485
 486	cards_found++;
 487	return 0;
 488
 489err_register:
 490err_sw_init:
 491err_eeprom:
 492	iounmap(adapter->hw.hw_addr);
 493err_ioremap:
 494	free_netdev(netdev);
 495err_alloc_etherdev:
 496	pci_release_regions(pdev);
 497err_request_regions:
 498err_dma_mask:
 499	pci_disable_device(pdev);
 500	return err;
 501}
 502
 503/**
 504 * ixgb_remove - Device Removal Routine
 505 * @pdev: PCI device information struct
 506 *
 507 * ixgb_remove is called by the PCI subsystem to alert the driver
 508 * that it should release a PCI device.  The could be caused by a
 509 * Hot-Plug event, or because the driver is going to be removed from
 510 * memory.
 511 **/
 512
 513static void
 514ixgb_remove(struct pci_dev *pdev)
 515{
 516	struct net_device *netdev = pci_get_drvdata(pdev);
 517	struct ixgb_adapter *adapter = netdev_priv(netdev);
 518
 519	cancel_work_sync(&adapter->tx_timeout_task);
 520
 521	unregister_netdev(netdev);
 522
 523	iounmap(adapter->hw.hw_addr);
 524	pci_release_regions(pdev);
 525
 526	free_netdev(netdev);
 527	pci_disable_device(pdev);
 528}
 529
 530/**
 531 * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
 532 * @adapter: board private structure to initialize
 533 *
 534 * ixgb_sw_init initializes the Adapter private data structure.
 535 * Fields are initialized based on PCI device information and
 536 * OS network device settings (MTU size).
 537 **/
 538
 539static int
 540ixgb_sw_init(struct ixgb_adapter *adapter)
 541{
 542	struct ixgb_hw *hw = &adapter->hw;
 543	struct net_device *netdev = adapter->netdev;
 544	struct pci_dev *pdev = adapter->pdev;
 545
 546	/* PCI config space info */
 547
 548	hw->vendor_id = pdev->vendor;
 549	hw->device_id = pdev->device;
 550	hw->subsystem_vendor_id = pdev->subsystem_vendor;
 551	hw->subsystem_id = pdev->subsystem_device;
 552
 553	hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
 554	adapter->rx_buffer_len = hw->max_frame_size + 8; /* + 8 for errata */
 555
 556	if ((hw->device_id == IXGB_DEVICE_ID_82597EX) ||
 557	    (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4) ||
 558	    (hw->device_id == IXGB_DEVICE_ID_82597EX_LR) ||
 559	    (hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
 560		hw->mac_type = ixgb_82597;
 561	else {
 562		/* should never have loaded on this device */
 563		netif_err(adapter, probe, adapter->netdev, "unsupported device id\n");
 564	}
 565
 566	/* enable flow control to be programmed */
 567	hw->fc.send_xon = 1;
 568
 569	set_bit(__IXGB_DOWN, &adapter->flags);
 570	return 0;
 571}
 572
 573/**
 574 * ixgb_open - Called when a network interface is made active
 575 * @netdev: network interface device structure
 576 *
 577 * Returns 0 on success, negative value on failure
 578 *
 579 * The open entry point is called when a network interface is made
 580 * active by the system (IFF_UP).  At this point all resources needed
 581 * for transmit and receive operations are allocated, the interrupt
 582 * handler is registered with the OS, the watchdog timer is started,
 583 * and the stack is notified that the interface is ready.
 584 **/
 585
 586static int
 587ixgb_open(struct net_device *netdev)
 588{
 589	struct ixgb_adapter *adapter = netdev_priv(netdev);
 590	int err;
 591
 592	/* allocate transmit descriptors */
 593	err = ixgb_setup_tx_resources(adapter);
 594	if (err)
 595		goto err_setup_tx;
 596
 597	netif_carrier_off(netdev);
 598
 599	/* allocate receive descriptors */
 600
 601	err = ixgb_setup_rx_resources(adapter);
 602	if (err)
 603		goto err_setup_rx;
 604
 605	err = ixgb_up(adapter);
 606	if (err)
 607		goto err_up;
 608
 609	netif_start_queue(netdev);
 610
 611	return 0;
 612
 613err_up:
 614	ixgb_free_rx_resources(adapter);
 615err_setup_rx:
 616	ixgb_free_tx_resources(adapter);
 617err_setup_tx:
 618	ixgb_reset(adapter);
 619
 620	return err;
 621}
 622
 623/**
 624 * ixgb_close - Disables a network interface
 625 * @netdev: network interface device structure
 626 *
 627 * Returns 0, this is not allowed to fail
 628 *
 629 * The close entry point is called when an interface is de-activated
 630 * by the OS.  The hardware is still under the drivers control, but
 631 * needs to be disabled.  A global MAC reset is issued to stop the
 632 * hardware, and all transmit and receive resources are freed.
 633 **/
 634
 635static int
 636ixgb_close(struct net_device *netdev)
 637{
 638	struct ixgb_adapter *adapter = netdev_priv(netdev);
 639
 640	ixgb_down(adapter, true);
 641
 642	ixgb_free_tx_resources(adapter);
 643	ixgb_free_rx_resources(adapter);
 644
 645	return 0;
 646}
 647
 648/**
 649 * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
 650 * @adapter: board private structure
 651 *
 652 * Return 0 on success, negative on failure
 653 **/
 654
 655int
 656ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
 657{
 658	struct ixgb_desc_ring *txdr = &adapter->tx_ring;
 659	struct pci_dev *pdev = adapter->pdev;
 660	int size;
 661
 662	size = sizeof(struct ixgb_buffer) * txdr->count;
 663	txdr->buffer_info = vzalloc(size);
 664	if (!txdr->buffer_info)
 665		return -ENOMEM;
 666
 667	/* round up to nearest 4K */
 668
 669	txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
 670	txdr->size = ALIGN(txdr->size, 4096);
 671
 672	txdr->desc = dma_alloc_coherent(&pdev->dev, txdr->size, &txdr->dma,
 673					GFP_KERNEL);
 674	if (!txdr->desc) {
 675		vfree(txdr->buffer_info);
 676		return -ENOMEM;
 677	}
 678
 679	txdr->next_to_use = 0;
 680	txdr->next_to_clean = 0;
 681
 682	return 0;
 683}
 684
 685/**
 686 * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
 687 * @adapter: board private structure
 688 *
 689 * Configure the Tx unit of the MAC after a reset.
 690 **/
 691
 692static void
 693ixgb_configure_tx(struct ixgb_adapter *adapter)
 694{
 695	u64 tdba = adapter->tx_ring.dma;
 696	u32 tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
 697	u32 tctl;
 698	struct ixgb_hw *hw = &adapter->hw;
 699
 700	/* Setup the Base and Length of the Tx Descriptor Ring
 701	 * tx_ring.dma can be either a 32 or 64 bit value
 702	 */
 703
 704	IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
 705	IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
 706
 707	IXGB_WRITE_REG(hw, TDLEN, tdlen);
 708
 709	/* Setup the HW Tx Head and Tail descriptor pointers */
 710
 711	IXGB_WRITE_REG(hw, TDH, 0);
 712	IXGB_WRITE_REG(hw, TDT, 0);
 713
 714	/* don't set up txdctl, it induces performance problems if configured
 715	 * incorrectly */
 716	/* Set the Tx Interrupt Delay register */
 717
 718	IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
 719
 720	/* Program the Transmit Control Register */
 721
 722	tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
 723	IXGB_WRITE_REG(hw, TCTL, tctl);
 724
 725	/* Setup Transmit Descriptor Settings for this adapter */
 726	adapter->tx_cmd_type =
 727		IXGB_TX_DESC_TYPE |
 728		(adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
 729}
 730
 731/**
 732 * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
 733 * @adapter: board private structure
 734 *
 735 * Returns 0 on success, negative on failure
 736 **/
 737
 738int
 739ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
 740{
 741	struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
 742	struct pci_dev *pdev = adapter->pdev;
 743	int size;
 744
 745	size = sizeof(struct ixgb_buffer) * rxdr->count;
 746	rxdr->buffer_info = vzalloc(size);
 747	if (!rxdr->buffer_info)
 748		return -ENOMEM;
 749
 750	/* Round up to nearest 4K */
 751
 752	rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
 753	rxdr->size = ALIGN(rxdr->size, 4096);
 754
 755	rxdr->desc = dma_alloc_coherent(&pdev->dev, rxdr->size, &rxdr->dma,
 756					GFP_KERNEL);
 757
 758	if (!rxdr->desc) {
 759		vfree(rxdr->buffer_info);
 760		return -ENOMEM;
 761	}
 762
 763	rxdr->next_to_clean = 0;
 764	rxdr->next_to_use = 0;
 765
 766	return 0;
 767}
 768
 769/**
 770 * ixgb_setup_rctl - configure the receive control register
 771 * @adapter: Board private structure
 772 **/
 773
 774static void
 775ixgb_setup_rctl(struct ixgb_adapter *adapter)
 776{
 777	u32 rctl;
 778
 779	rctl = IXGB_READ_REG(&adapter->hw, RCTL);
 780
 781	rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
 782
 783	rctl |=
 784		IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
 785		IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
 786		(adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
 787
 788	rctl |= IXGB_RCTL_SECRC;
 789
 790	if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048)
 791		rctl |= IXGB_RCTL_BSIZE_2048;
 792	else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096)
 793		rctl |= IXGB_RCTL_BSIZE_4096;
 794	else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192)
 795		rctl |= IXGB_RCTL_BSIZE_8192;
 796	else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384)
 797		rctl |= IXGB_RCTL_BSIZE_16384;
 798
 799	IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
 800}
 801
 802/**
 803 * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
 804 * @adapter: board private structure
 805 *
 806 * Configure the Rx unit of the MAC after a reset.
 807 **/
 808
 809static void
 810ixgb_configure_rx(struct ixgb_adapter *adapter)
 811{
 812	u64 rdba = adapter->rx_ring.dma;
 813	u32 rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
 814	struct ixgb_hw *hw = &adapter->hw;
 815	u32 rctl;
 816	u32 rxcsum;
 817
 818	/* make sure receives are disabled while setting up the descriptors */
 819
 820	rctl = IXGB_READ_REG(hw, RCTL);
 821	IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
 822
 823	/* set the Receive Delay Timer Register */
 824
 825	IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
 826
 827	/* Setup the Base and Length of the Rx Descriptor Ring */
 828
 829	IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
 830	IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
 831
 832	IXGB_WRITE_REG(hw, RDLEN, rdlen);
 833
 834	/* Setup the HW Rx Head and Tail Descriptor Pointers */
 835	IXGB_WRITE_REG(hw, RDH, 0);
 836	IXGB_WRITE_REG(hw, RDT, 0);
 837
 838	/* due to the hardware errata with RXDCTL, we are unable to use any of
 839	 * the performance enhancing features of it without causing other
 840	 * subtle bugs, some of the bugs could include receive length
 841	 * corruption at high data rates (WTHRESH > 0) and/or receive
 842	 * descriptor ring irregularites (particularly in hardware cache) */
 843	IXGB_WRITE_REG(hw, RXDCTL, 0);
 844
 845	/* Enable Receive Checksum Offload for TCP and UDP */
 846	if (adapter->rx_csum) {
 847		rxcsum = IXGB_READ_REG(hw, RXCSUM);
 848		rxcsum |= IXGB_RXCSUM_TUOFL;
 849		IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
 850	}
 851
 852	/* Enable Receives */
 853
 854	IXGB_WRITE_REG(hw, RCTL, rctl);
 855}
 856
 857/**
 858 * ixgb_free_tx_resources - Free Tx Resources
 859 * @adapter: board private structure
 860 *
 861 * Free all transmit software resources
 862 **/
 863
 864void
 865ixgb_free_tx_resources(struct ixgb_adapter *adapter)
 866{
 867	struct pci_dev *pdev = adapter->pdev;
 868
 869	ixgb_clean_tx_ring(adapter);
 870
 871	vfree(adapter->tx_ring.buffer_info);
 872	adapter->tx_ring.buffer_info = NULL;
 873
 874	dma_free_coherent(&pdev->dev, adapter->tx_ring.size,
 875			  adapter->tx_ring.desc, adapter->tx_ring.dma);
 876
 877	adapter->tx_ring.desc = NULL;
 878}
 879
 880static void
 881ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
 882                                struct ixgb_buffer *buffer_info)
 883{
 884	if (buffer_info->dma) {
 885		if (buffer_info->mapped_as_page)
 886			dma_unmap_page(&adapter->pdev->dev, buffer_info->dma,
 887				       buffer_info->length, DMA_TO_DEVICE);
 888		else
 889			dma_unmap_single(&adapter->pdev->dev, buffer_info->dma,
 890					 buffer_info->length, DMA_TO_DEVICE);
 891		buffer_info->dma = 0;
 892	}
 893
 894	if (buffer_info->skb) {
 895		dev_kfree_skb_any(buffer_info->skb);
 896		buffer_info->skb = NULL;
 897	}
 898	buffer_info->time_stamp = 0;
 899	/* these fields must always be initialized in tx
 900	 * buffer_info->length = 0;
 901	 * buffer_info->next_to_watch = 0; */
 902}
 903
 904/**
 905 * ixgb_clean_tx_ring - Free Tx Buffers
 906 * @adapter: board private structure
 907 **/
 908
 909static void
 910ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
 911{
 912	struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
 913	struct ixgb_buffer *buffer_info;
 914	unsigned long size;
 915	unsigned int i;
 916
 917	/* Free all the Tx ring sk_buffs */
 918
 919	for (i = 0; i < tx_ring->count; i++) {
 920		buffer_info = &tx_ring->buffer_info[i];
 921		ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
 922	}
 923
 924	size = sizeof(struct ixgb_buffer) * tx_ring->count;
 925	memset(tx_ring->buffer_info, 0, size);
 926
 927	/* Zero out the descriptor ring */
 928
 929	memset(tx_ring->desc, 0, tx_ring->size);
 930
 931	tx_ring->next_to_use = 0;
 932	tx_ring->next_to_clean = 0;
 933
 934	IXGB_WRITE_REG(&adapter->hw, TDH, 0);
 935	IXGB_WRITE_REG(&adapter->hw, TDT, 0);
 936}
 937
 938/**
 939 * ixgb_free_rx_resources - Free Rx Resources
 940 * @adapter: board private structure
 941 *
 942 * Free all receive software resources
 943 **/
 944
 945void
 946ixgb_free_rx_resources(struct ixgb_adapter *adapter)
 947{
 948	struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
 949	struct pci_dev *pdev = adapter->pdev;
 950
 951	ixgb_clean_rx_ring(adapter);
 952
 953	vfree(rx_ring->buffer_info);
 954	rx_ring->buffer_info = NULL;
 955
 956	dma_free_coherent(&pdev->dev, rx_ring->size, rx_ring->desc,
 957			  rx_ring->dma);
 958
 959	rx_ring->desc = NULL;
 960}
 961
 962/**
 963 * ixgb_clean_rx_ring - Free Rx Buffers
 964 * @adapter: board private structure
 965 **/
 966
 967static void
 968ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
 969{
 970	struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
 971	struct ixgb_buffer *buffer_info;
 972	struct pci_dev *pdev = adapter->pdev;
 973	unsigned long size;
 974	unsigned int i;
 975
 976	/* Free all the Rx ring sk_buffs */
 977
 978	for (i = 0; i < rx_ring->count; i++) {
 979		buffer_info = &rx_ring->buffer_info[i];
 980		if (buffer_info->dma) {
 981			dma_unmap_single(&pdev->dev,
 982					 buffer_info->dma,
 983					 buffer_info->length,
 984					 DMA_FROM_DEVICE);
 985			buffer_info->dma = 0;
 986			buffer_info->length = 0;
 987		}
 988
 989		if (buffer_info->skb) {
 990			dev_kfree_skb(buffer_info->skb);
 991			buffer_info->skb = NULL;
 992		}
 993	}
 994
 995	size = sizeof(struct ixgb_buffer) * rx_ring->count;
 996	memset(rx_ring->buffer_info, 0, size);
 997
 998	/* Zero out the descriptor ring */
 999
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
1017static int
1018ixgb_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
1043static void
1044ixgb_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
1095alloc_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
1108static void
1109ixgb_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
1173static int
1174ixgb_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
1237static bool
1238ixgb_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
1278static int
1279ixgb_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
1361dma_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
1378static void
1379ixgb_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
1428static 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
1450static 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
1466static netdev_tx_t
1467ixgb_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
1530static void
1531ixgb_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
1539static void
1540ixgb_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
1558static int
1559ixgb_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
1582void
1583ixgb_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
1713static irqreturn_t
1714ixgb_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
1746static int
1747ixgb_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
1770static bool
1771ixgb_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
1865static void
1866ixgb_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 */
1896static 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
1924static bool
1925ixgb_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
2014rxdesc_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
2044static void
2045ixgb_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;
2079map_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
2116static void
2117ixgb_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
2127static void
2128ixgb_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
2138static int
2139ixgb_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
2155static int
2156ixgb_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
2172static void
2173ixgb_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 */
2189static 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 */
2218static 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 */
2267static 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 */