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 int pci_using_dac; 365 int i; 366 int err; 367 368 err = pci_enable_device(pdev); 369 if (err) 370 return err; 371 372 pci_using_dac = 0; 373 err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64)); 374 if (!err) { 375 pci_using_dac = 1; 376 } else { 377 err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); 378 if (err) { 379 pr_err("No usable DMA configuration, aborting\n"); 380 goto err_dma_mask; 381 } 382 } 383 384 err = pci_request_regions(pdev, ixgb_driver_name); 385 if (err) 386 goto err_request_regions; 387 388 pci_set_master(pdev); 389 390 netdev = alloc_etherdev(sizeof(struct ixgb_adapter)); 391 if (!netdev) { 392 err = -ENOMEM; 393 goto err_alloc_etherdev; 394 } 395 396 SET_NETDEV_DEV(netdev, &pdev->dev); 397 398 pci_set_drvdata(pdev, netdev); 399 adapter = netdev_priv(netdev); 400 adapter->netdev = netdev; 401 adapter->pdev = pdev; 402 adapter->hw.back = adapter; 403 adapter->msg_enable = netif_msg_init(debug, DEFAULT_MSG_ENABLE); 404 405 adapter->hw.hw_addr = pci_ioremap_bar(pdev, BAR_0); 406 if (!adapter->hw.hw_addr) { 407 err = -EIO; 408 goto err_ioremap; 409 } 410 411 for (i = BAR_1; i < PCI_STD_NUM_BARS; i++) { 412 if (pci_resource_len(pdev, i) == 0) 413 continue; 414 if (pci_resource_flags(pdev, i) & IORESOURCE_IO) { 415 adapter->hw.io_base = pci_resource_start(pdev, i); 416 break; 417 } 418 } 419 420 netdev->netdev_ops = &ixgb_netdev_ops; 421 ixgb_set_ethtool_ops(netdev); 422 netdev->watchdog_timeo = 5 * HZ; 423 netif_napi_add(netdev, &adapter->napi, ixgb_clean, 64); 424 425 strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1); 426 427 adapter->bd_number = cards_found; 428 adapter->link_speed = 0; 429 adapter->link_duplex = 0; 430 431 /* setup the private structure */ 432 433 err = ixgb_sw_init(adapter); 434 if (err) 435 goto err_sw_init; 436 437 netdev->hw_features = NETIF_F_SG | 438 NETIF_F_TSO | 439 NETIF_F_HW_CSUM | 440 NETIF_F_HW_VLAN_CTAG_TX | 441 NETIF_F_HW_VLAN_CTAG_RX; 442 netdev->features = netdev->hw_features | 443 NETIF_F_HW_VLAN_CTAG_FILTER; 444 netdev->hw_features |= NETIF_F_RXCSUM; 445 446 if (pci_using_dac) { 447 netdev->features |= NETIF_F_HIGHDMA; 448 netdev->vlan_features |= NETIF_F_HIGHDMA; 449 } 450 451 /* MTU range: 68 - 16114 */ 452 netdev->min_mtu = ETH_MIN_MTU; 453 netdev->max_mtu = IXGB_MAX_JUMBO_FRAME_SIZE - ETH_HLEN; 454 455 /* make sure the EEPROM is good */ 456 457 if (!ixgb_validate_eeprom_checksum(&adapter->hw)) { 458 netif_err(adapter, probe, adapter->netdev, 459 "The EEPROM Checksum Is Not Valid\n"); 460 err = -EIO; 461 goto err_eeprom; 462 } 463 464 ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr); 465 466 if (!is_valid_ether_addr(netdev->dev_addr)) { 467 netif_err(adapter, probe, adapter->netdev, "Invalid MAC Address\n"); 468 err = -EIO; 469 goto err_eeprom; 470 } 471 472 adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw); 473 474 timer_setup(&adapter->watchdog_timer, ixgb_watchdog, 0); 475 476 INIT_WORK(&adapter->tx_timeout_task, ixgb_tx_timeout_task); 477 478 strcpy(netdev->name, "eth%d"); 479 err = register_netdev(netdev); 480 if (err) 481 goto err_register; 482 483 /* carrier off reporting is important to ethtool even BEFORE open */ 484 netif_carrier_off(netdev); 485 486 netif_info(adapter, probe, adapter->netdev, 487 "Intel(R) PRO/10GbE Network Connection\n"); 488 ixgb_check_options(adapter); 489 /* reset the hardware with the new settings */ 490 491 ixgb_reset(adapter); 492 493 cards_found++; 494 return 0; 495 496err_register: 497err_sw_init: 498err_eeprom: 499 iounmap(adapter->hw.hw_addr); 500err_ioremap: 501 free_netdev(netdev); 502err_alloc_etherdev: 503 pci_release_regions(pdev); 504err_request_regions: 505err_dma_mask: 506 pci_disable_device(pdev); 507 return err; 508} 509 510/** 511 * ixgb_remove - Device Removal Routine 512 * @pdev: PCI device information struct 513 * 514 * ixgb_remove is called by the PCI subsystem to alert the driver 515 * that it should release a PCI device. The could be caused by a 516 * Hot-Plug event, or because the driver is going to be removed from 517 * memory. 518 **/ 519 520static void 521ixgb_remove(struct pci_dev *pdev) 522{ 523 struct net_device *netdev = pci_get_drvdata(pdev); 524 struct ixgb_adapter *adapter = netdev_priv(netdev); 525 526 cancel_work_sync(&adapter->tx_timeout_task); 527 528 unregister_netdev(netdev); 529 530 iounmap(adapter->hw.hw_addr); 531 pci_release_regions(pdev); 532 533 free_netdev(netdev); 534 pci_disable_device(pdev); 535} 536 537/** 538 * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter) 539 * @adapter: board private structure to initialize 540 * 541 * ixgb_sw_init initializes the Adapter private data structure. 542 * Fields are initialized based on PCI device information and 543 * OS network device settings (MTU size). 544 **/ 545 546static int 547ixgb_sw_init(struct ixgb_adapter *adapter) 548{ 549 struct ixgb_hw *hw = &adapter->hw; 550 struct net_device *netdev = adapter->netdev; 551 struct pci_dev *pdev = adapter->pdev; 552 553 /* PCI config space info */ 554 555 hw->vendor_id = pdev->vendor; 556 hw->device_id = pdev->device; 557 hw->subsystem_vendor_id = pdev->subsystem_vendor; 558 hw->subsystem_id = pdev->subsystem_device; 559 560 hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH; 561 adapter->rx_buffer_len = hw->max_frame_size + 8; /* + 8 for errata */ 562 563 if ((hw->device_id == IXGB_DEVICE_ID_82597EX) || 564 (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4) || 565 (hw->device_id == IXGB_DEVICE_ID_82597EX_LR) || 566 (hw->device_id == IXGB_DEVICE_ID_82597EX_SR)) 567 hw->mac_type = ixgb_82597; 568 else { 569 /* should never have loaded on this device */ 570 netif_err(adapter, probe, adapter->netdev, "unsupported device id\n"); 571 } 572 573 /* enable flow control to be programmed */ 574 hw->fc.send_xon = 1; 575 576 set_bit(__IXGB_DOWN, &adapter->flags); 577 return 0; 578} 579 580/** 581 * ixgb_open - Called when a network interface is made active 582 * @netdev: network interface device structure 583 * 584 * Returns 0 on success, negative value on failure 585 * 586 * The open entry point is called when a network interface is made 587 * active by the system (IFF_UP). At this point all resources needed 588 * for transmit and receive operations are allocated, the interrupt 589 * handler is registered with the OS, the watchdog timer is started, 590 * and the stack is notified that the interface is ready. 591 **/ 592 593static int 594ixgb_open(struct net_device *netdev) 595{ 596 struct ixgb_adapter *adapter = netdev_priv(netdev); 597 int err; 598 599 /* allocate transmit descriptors */ 600 err = ixgb_setup_tx_resources(adapter); 601 if (err) 602 goto err_setup_tx; 603 604 netif_carrier_off(netdev); 605 606 /* allocate receive descriptors */ 607 608 err = ixgb_setup_rx_resources(adapter); 609 if (err) 610 goto err_setup_rx; 611 612 err = ixgb_up(adapter); 613 if (err) 614 goto err_up; 615 616 netif_start_queue(netdev); 617 618 return 0; 619 620err_up: 621 ixgb_free_rx_resources(adapter); 622err_setup_rx: 623 ixgb_free_tx_resources(adapter); 624err_setup_tx: 625 ixgb_reset(adapter); 626 627 return err; 628} 629 630/** 631 * ixgb_close - Disables a network interface 632 * @netdev: network interface device structure 633 * 634 * Returns 0, this is not allowed to fail 635 * 636 * The close entry point is called when an interface is de-activated 637 * by the OS. The hardware is still under the drivers control, but 638 * needs to be disabled. A global MAC reset is issued to stop the 639 * hardware, and all transmit and receive resources are freed. 640 **/ 641 642static int 643ixgb_close(struct net_device *netdev) 644{ 645 struct ixgb_adapter *adapter = netdev_priv(netdev); 646 647 ixgb_down(adapter, true); 648 649 ixgb_free_tx_resources(adapter); 650 ixgb_free_rx_resources(adapter); 651 652 return 0; 653} 654 655/** 656 * ixgb_setup_tx_resources - allocate Tx resources (Descriptors) 657 * @adapter: board private structure 658 * 659 * Return 0 on success, negative on failure 660 **/ 661 662int 663ixgb_setup_tx_resources(struct ixgb_adapter *adapter) 664{ 665 struct ixgb_desc_ring *txdr = &adapter->tx_ring; 666 struct pci_dev *pdev = adapter->pdev; 667 int size; 668 669 size = sizeof(struct ixgb_buffer) * txdr->count; 670 txdr->buffer_info = vzalloc(size); 671 if (!txdr->buffer_info) 672 return -ENOMEM; 673 674 /* round up to nearest 4K */ 675 676 txdr->size = txdr->count * sizeof(struct ixgb_tx_desc); 677 txdr->size = ALIGN(txdr->size, 4096); 678 679 txdr->desc = dma_alloc_coherent(&pdev->dev, txdr->size, &txdr->dma, 680 GFP_KERNEL); 681 if (!txdr->desc) { 682 vfree(txdr->buffer_info); 683 return -ENOMEM; 684 } 685 686 txdr->next_to_use = 0; 687 txdr->next_to_clean = 0; 688 689 return 0; 690} 691 692/** 693 * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset. 694 * @adapter: board private structure 695 * 696 * Configure the Tx unit of the MAC after a reset. 697 **/ 698 699static void 700ixgb_configure_tx(struct ixgb_adapter *adapter) 701{ 702 u64 tdba = adapter->tx_ring.dma; 703 u32 tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc); 704 u32 tctl; 705 struct ixgb_hw *hw = &adapter->hw; 706 707 /* Setup the Base and Length of the Tx Descriptor Ring 708 * tx_ring.dma can be either a 32 or 64 bit value 709 */ 710 711 IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL)); 712 IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32)); 713 714 IXGB_WRITE_REG(hw, TDLEN, tdlen); 715 716 /* Setup the HW Tx Head and Tail descriptor pointers */ 717 718 IXGB_WRITE_REG(hw, TDH, 0); 719 IXGB_WRITE_REG(hw, TDT, 0); 720 721 /* don't set up txdctl, it induces performance problems if configured 722 * incorrectly */ 723 /* Set the Tx Interrupt Delay register */ 724 725 IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay); 726 727 /* Program the Transmit Control Register */ 728 729 tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE; 730 IXGB_WRITE_REG(hw, TCTL, tctl); 731 732 /* Setup Transmit Descriptor Settings for this adapter */ 733 adapter->tx_cmd_type = 734 IXGB_TX_DESC_TYPE | 735 (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0); 736} 737 738/** 739 * ixgb_setup_rx_resources - allocate Rx resources (Descriptors) 740 * @adapter: board private structure 741 * 742 * Returns 0 on success, negative on failure 743 **/ 744 745int 746ixgb_setup_rx_resources(struct ixgb_adapter *adapter) 747{ 748 struct ixgb_desc_ring *rxdr = &adapter->rx_ring; 749 struct pci_dev *pdev = adapter->pdev; 750 int size; 751 752 size = sizeof(struct ixgb_buffer) * rxdr->count; 753 rxdr->buffer_info = vzalloc(size); 754 if (!rxdr->buffer_info) 755 return -ENOMEM; 756 757 /* Round up to nearest 4K */ 758 759 rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc); 760 rxdr->size = ALIGN(rxdr->size, 4096); 761 762 rxdr->desc = dma_alloc_coherent(&pdev->dev, rxdr->size, &rxdr->dma, 763 GFP_KERNEL); 764 765 if (!rxdr->desc) { 766 vfree(rxdr->buffer_info); 767 return -ENOMEM; 768 } 769 770 rxdr->next_to_clean = 0; 771 rxdr->next_to_use = 0; 772 773 return 0; 774} 775 776/** 777 * ixgb_setup_rctl - configure the receive control register 778 * @adapter: Board private structure 779 **/ 780 781static void 782ixgb_setup_rctl(struct ixgb_adapter *adapter) 783{ 784 u32 rctl; 785 786 rctl = IXGB_READ_REG(&adapter->hw, RCTL); 787 788 rctl &= ~(3 << IXGB_RCTL_MO_SHIFT); 789 790 rctl |= 791 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 | 792 IXGB_RCTL_RXEN | IXGB_RCTL_CFF | 793 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT); 794 795 rctl |= IXGB_RCTL_SECRC; 796 797 if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048) 798 rctl |= IXGB_RCTL_BSIZE_2048; 799 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096) 800 rctl |= IXGB_RCTL_BSIZE_4096; 801 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192) 802 rctl |= IXGB_RCTL_BSIZE_8192; 803 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384) 804 rctl |= IXGB_RCTL_BSIZE_16384; 805 806 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl); 807} 808 809/** 810 * ixgb_configure_rx - Configure 82597 Receive Unit after Reset. 811 * @adapter: board private structure 812 * 813 * Configure the Rx unit of the MAC after a reset. 814 **/ 815 816static void 817ixgb_configure_rx(struct ixgb_adapter *adapter) 818{ 819 u64 rdba = adapter->rx_ring.dma; 820 u32 rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc); 821 struct ixgb_hw *hw = &adapter->hw; 822 u32 rctl; 823 u32 rxcsum; 824 825 /* make sure receives are disabled while setting up the descriptors */ 826 827 rctl = IXGB_READ_REG(hw, RCTL); 828 IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN); 829 830 /* set the Receive Delay Timer Register */ 831 832 IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay); 833 834 /* Setup the Base and Length of the Rx Descriptor Ring */ 835 836 IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL)); 837 IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32)); 838 839 IXGB_WRITE_REG(hw, RDLEN, rdlen); 840 841 /* Setup the HW Rx Head and Tail Descriptor Pointers */ 842 IXGB_WRITE_REG(hw, RDH, 0); 843 IXGB_WRITE_REG(hw, RDT, 0); 844 845 /* due to the hardware errata with RXDCTL, we are unable to use any of 846 * the performance enhancing features of it without causing other 847 * subtle bugs, some of the bugs could include receive length 848 * corruption at high data rates (WTHRESH > 0) and/or receive 849 * descriptor ring irregularites (particularly in hardware cache) */ 850 IXGB_WRITE_REG(hw, RXDCTL, 0); 851 852 /* Enable Receive Checksum Offload for TCP and UDP */ 853 if (adapter->rx_csum) { 854 rxcsum = IXGB_READ_REG(hw, RXCSUM); 855 rxcsum |= IXGB_RXCSUM_TUOFL; 856 IXGB_WRITE_REG(hw, RXCSUM, rxcsum); 857 } 858 859 /* Enable Receives */ 860 861 IXGB_WRITE_REG(hw, RCTL, rctl); 862} 863 864/** 865 * ixgb_free_tx_resources - Free Tx Resources 866 * @adapter: board private structure 867 * 868 * Free all transmit software resources 869 **/ 870 871void 872ixgb_free_tx_resources(struct ixgb_adapter *adapter) 873{ 874 struct pci_dev *pdev = adapter->pdev; 875 876 ixgb_clean_tx_ring(adapter); 877 878 vfree(adapter->tx_ring.buffer_info); 879 adapter->tx_ring.buffer_info = NULL; 880 881 dma_free_coherent(&pdev->dev, adapter->tx_ring.size, 882 adapter->tx_ring.desc, adapter->tx_ring.dma); 883 884 adapter->tx_ring.desc = NULL; 885} 886 887static void 888ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter, 889 struct ixgb_buffer *buffer_info) 890{ 891 if (buffer_info->dma) { 892 if (buffer_info->mapped_as_page) 893 dma_unmap_page(&adapter->pdev->dev, buffer_info->dma, 894 buffer_info->length, DMA_TO_DEVICE); 895 else 896 dma_unmap_single(&adapter->pdev->dev, buffer_info->dma, 897 buffer_info->length, DMA_TO_DEVICE); 898 buffer_info->dma = 0; 899 } 900 901 if (buffer_info->skb) { 902 dev_kfree_skb_any(buffer_info->skb); 903 buffer_info->skb = NULL; 904 } 905 buffer_info->time_stamp = 0; 906 /* these fields must always be initialized in tx 907 * buffer_info->length = 0; 908 * buffer_info->next_to_watch = 0; */ 909} 910 911/** 912 * ixgb_clean_tx_ring - Free Tx Buffers 913 * @adapter: board private structure 914 **/ 915 916static void 917ixgb_clean_tx_ring(struct ixgb_adapter *adapter) 918{ 919 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring; 920 struct ixgb_buffer *buffer_info; 921 unsigned long size; 922 unsigned int i; 923 924 /* Free all the Tx ring sk_buffs */ 925 926 for (i = 0; i < tx_ring->count; i++) { 927 buffer_info = &tx_ring->buffer_info[i]; 928 ixgb_unmap_and_free_tx_resource(adapter, buffer_info); 929 } 930 931 size = sizeof(struct ixgb_buffer) * tx_ring->count; 932 memset(tx_ring->buffer_info, 0, size); 933 934 /* Zero out the descriptor ring */ 935 936 memset(tx_ring->desc, 0, tx_ring->size); 937 938 tx_ring->next_to_use = 0; 939 tx_ring->next_to_clean = 0; 940 941 IXGB_WRITE_REG(&adapter->hw, TDH, 0); 942 IXGB_WRITE_REG(&adapter->hw, TDT, 0); 943} 944 945/** 946 * ixgb_free_rx_resources - Free Rx Resources 947 * @adapter: board private structure 948 * 949 * Free all receive software resources 950 **/ 951 952void 953ixgb_free_rx_resources(struct ixgb_adapter *adapter) 954{ 955 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring; 956 struct pci_dev *pdev = adapter->pdev; 957 958 ixgb_clean_rx_ring(adapter); 959 960 vfree(rx_ring->buffer_info); 961 rx_ring->buffer_info = NULL; 962 963 dma_free_coherent(&pdev->dev, rx_ring->size, rx_ring->desc, 964 rx_ring->dma); 965 966 rx_ring->desc = NULL; 967} 968 969/** 970 * ixgb_clean_rx_ring - Free Rx Buffers 971 * @adapter: board private structure 972 **/ 973 974static void 975ixgb_clean_rx_ring(struct ixgb_adapter *adapter) 976{ 977 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring; 978 struct ixgb_buffer *buffer_info; 979 struct pci_dev *pdev = adapter->pdev; 980 unsigned long size; 981 unsigned int i; 982 983 /* Free all the Rx ring sk_buffs */ 984 985 for (i = 0; i < rx_ring->count; i++) { 986 buffer_info = &rx_ring->buffer_info[i]; 987 if (buffer_info->dma) { 988 dma_unmap_single(&pdev->dev, 989 buffer_info->dma, 990 buffer_info->length, 991 DMA_FROM_DEVICE); 992 buffer_info->dma = 0; 993 buffer_info->length = 0; 994 } 995 996 if (buffer_info->skb) { 997 dev_kfree_skb(buffer_info->skb); 998 buffer_info->skb = NULL; 999 } 1000 } 1001 1002 size = sizeof(struct ixgb_buffer) * rx_ring->count; 1003 memset(rx_ring->buffer_info, 0, size); 1004 1005 /* Zero out the descriptor ring */ 1006 1007 memset(rx_ring->desc, 0, rx_ring->size); 1008 1009 rx_ring->next_to_clean = 0; 1010 rx_ring->next_to_use = 0; 1011 1012 IXGB_WRITE_REG(&adapter->hw, RDH, 0); 1013 IXGB_WRITE_REG(&adapter->hw, RDT, 0); 1014} 1015 1016/** 1017 * ixgb_set_mac - Change the Ethernet Address of the NIC 1018 * @netdev: network interface device structure 1019 * @p: pointer to an address structure 1020 * 1021 * Returns 0 on success, negative on failure 1022 **/ 1023 1024static int 1025ixgb_set_mac(struct net_device *netdev, void *p) 1026{ 1027 struct ixgb_adapter *adapter = netdev_priv(netdev); 1028 struct sockaddr *addr = p; 1029 1030 if (!is_valid_ether_addr(addr->sa_data)) 1031 return -EADDRNOTAVAIL; 1032 1033 memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len); 1034 1035 ixgb_rar_set(&adapter->hw, addr->sa_data, 0); 1036 1037 return 0; 1038} 1039 1040/** 1041 * ixgb_set_multi - Multicast and Promiscuous mode set 1042 * @netdev: network interface device structure 1043 * 1044 * The set_multi entry point is called whenever the multicast address 1045 * list or the network interface flags are updated. This routine is 1046 * responsible for configuring the hardware for proper multicast, 1047 * promiscuous mode, and all-multi behavior. 1048 **/ 1049 1050static void 1051ixgb_set_multi(struct net_device *netdev) 1052{ 1053 struct ixgb_adapter *adapter = netdev_priv(netdev); 1054 struct ixgb_hw *hw = &adapter->hw; 1055 struct netdev_hw_addr *ha; 1056 u32 rctl; 1057 1058 /* Check for Promiscuous and All Multicast modes */ 1059 1060 rctl = IXGB_READ_REG(hw, RCTL); 1061 1062 if (netdev->flags & IFF_PROMISC) { 1063 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE); 1064 /* disable VLAN filtering */ 1065 rctl &= ~IXGB_RCTL_CFIEN; 1066 rctl &= ~IXGB_RCTL_VFE; 1067 } else { 1068 if (netdev->flags & IFF_ALLMULTI) { 1069 rctl |= IXGB_RCTL_MPE; 1070 rctl &= ~IXGB_RCTL_UPE; 1071 } else { 1072 rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE); 1073 } 1074 /* enable VLAN filtering */ 1075 rctl |= IXGB_RCTL_VFE; 1076 rctl &= ~IXGB_RCTL_CFIEN; 1077 } 1078 1079 if (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES) { 1080 rctl |= IXGB_RCTL_MPE; 1081 IXGB_WRITE_REG(hw, RCTL, rctl); 1082 } else { 1083 u8 *mta = kmalloc_array(ETH_ALEN, 1084 IXGB_MAX_NUM_MULTICAST_ADDRESSES, 1085 GFP_ATOMIC); 1086 u8 *addr; 1087 if (!mta) 1088 goto alloc_failed; 1089 1090 IXGB_WRITE_REG(hw, RCTL, rctl); 1091 1092 addr = mta; 1093 netdev_for_each_mc_addr(ha, netdev) { 1094 memcpy(addr, ha->addr, ETH_ALEN); 1095 addr += ETH_ALEN; 1096 } 1097 1098 ixgb_mc_addr_list_update(hw, mta, netdev_mc_count(netdev), 0); 1099 kfree(mta); 1100 } 1101 1102alloc_failed: 1103 if (netdev->features & NETIF_F_HW_VLAN_CTAG_RX) 1104 ixgb_vlan_strip_enable(adapter); 1105 else 1106 ixgb_vlan_strip_disable(adapter); 1107 1108} 1109 1110/** 1111 * ixgb_watchdog - Timer Call-back 1112 * @t: pointer to timer_list containing our private info pointer 1113 **/ 1114 1115static void 1116ixgb_watchdog(struct timer_list *t) 1117{ 1118 struct ixgb_adapter *adapter = from_timer(adapter, t, watchdog_timer); 1119 struct net_device *netdev = adapter->netdev; 1120 struct ixgb_desc_ring *txdr = &adapter->tx_ring; 1121 1122 ixgb_check_for_link(&adapter->hw); 1123 1124 if (ixgb_check_for_bad_link(&adapter->hw)) { 1125 /* force the reset path */ 1126 netif_stop_queue(netdev); 1127 } 1128 1129 if (adapter->hw.link_up) { 1130 if (!netif_carrier_ok(netdev)) { 1131 netdev_info(netdev, 1132 "NIC Link is Up 10 Gbps Full Duplex, Flow Control: %s\n", 1133 (adapter->hw.fc.type == ixgb_fc_full) ? 1134 "RX/TX" : 1135 (adapter->hw.fc.type == ixgb_fc_rx_pause) ? 1136 "RX" : 1137 (adapter->hw.fc.type == ixgb_fc_tx_pause) ? 1138 "TX" : "None"); 1139 adapter->link_speed = 10000; 1140 adapter->link_duplex = FULL_DUPLEX; 1141 netif_carrier_on(netdev); 1142 } 1143 } else { 1144 if (netif_carrier_ok(netdev)) { 1145 adapter->link_speed = 0; 1146 adapter->link_duplex = 0; 1147 netdev_info(netdev, "NIC Link is Down\n"); 1148 netif_carrier_off(netdev); 1149 } 1150 } 1151 1152 ixgb_update_stats(adapter); 1153 1154 if (!netif_carrier_ok(netdev)) { 1155 if (IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) { 1156 /* We've lost link, so the controller stops DMA, 1157 * but we've got queued Tx work that's never going 1158 * to get done, so reset controller to flush Tx. 1159 * (Do the reset outside of interrupt context). */ 1160 schedule_work(&adapter->tx_timeout_task); 1161 /* return immediately since reset is imminent */ 1162 return; 1163 } 1164 } 1165 1166 /* Force detection of hung controller every watchdog period */ 1167 adapter->detect_tx_hung = true; 1168 1169 /* generate an interrupt to force clean up of any stragglers */ 1170 IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW); 1171 1172 /* Reset the timer */ 1173 mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ); 1174} 1175 1176#define IXGB_TX_FLAGS_CSUM 0x00000001 1177#define IXGB_TX_FLAGS_VLAN 0x00000002 1178#define IXGB_TX_FLAGS_TSO 0x00000004 1179 1180static int 1181ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb) 1182{ 1183 struct ixgb_context_desc *context_desc; 1184 unsigned int i; 1185 u8 ipcss, ipcso, tucss, tucso, hdr_len; 1186 u16 ipcse, tucse, mss; 1187 1188 if (likely(skb_is_gso(skb))) { 1189 struct ixgb_buffer *buffer_info; 1190 struct iphdr *iph; 1191 int err; 1192 1193 err = skb_cow_head(skb, 0); 1194 if (err < 0) 1195 return err; 1196 1197 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb); 1198 mss = skb_shinfo(skb)->gso_size; 1199 iph = ip_hdr(skb); 1200 iph->tot_len = 0; 1201 iph->check = 0; 1202 tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr, 1203 iph->daddr, 0, 1204 IPPROTO_TCP, 0); 1205 ipcss = skb_network_offset(skb); 1206 ipcso = (void *)&(iph->check) - (void *)skb->data; 1207 ipcse = skb_transport_offset(skb) - 1; 1208 tucss = skb_transport_offset(skb); 1209 tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data; 1210 tucse = 0; 1211 1212 i = adapter->tx_ring.next_to_use; 1213 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i); 1214 buffer_info = &adapter->tx_ring.buffer_info[i]; 1215 WARN_ON(buffer_info->dma != 0); 1216 1217 context_desc->ipcss = ipcss; 1218 context_desc->ipcso = ipcso; 1219 context_desc->ipcse = cpu_to_le16(ipcse); 1220 context_desc->tucss = tucss; 1221 context_desc->tucso = tucso; 1222 context_desc->tucse = cpu_to_le16(tucse); 1223 context_desc->mss = cpu_to_le16(mss); 1224 context_desc->hdr_len = hdr_len; 1225 context_desc->status = 0; 1226 context_desc->cmd_type_len = cpu_to_le32( 1227 IXGB_CONTEXT_DESC_TYPE 1228 | IXGB_CONTEXT_DESC_CMD_TSE 1229 | IXGB_CONTEXT_DESC_CMD_IP 1230 | IXGB_CONTEXT_DESC_CMD_TCP 1231 | IXGB_CONTEXT_DESC_CMD_IDE 1232 | (skb->len - (hdr_len))); 1233 1234 1235 if (++i == adapter->tx_ring.count) i = 0; 1236 adapter->tx_ring.next_to_use = i; 1237 1238 return 1; 1239 } 1240 1241 return 0; 1242} 1243 1244static bool 1245ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb) 1246{ 1247 struct ixgb_context_desc *context_desc; 1248 unsigned int i; 1249 u8 css, cso; 1250 1251 if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) { 1252 struct ixgb_buffer *buffer_info; 1253 css = skb_checksum_start_offset(skb); 1254 cso = css + skb->csum_offset; 1255 1256 i = adapter->tx_ring.next_to_use; 1257 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i); 1258 buffer_info = &adapter->tx_ring.buffer_info[i]; 1259 WARN_ON(buffer_info->dma != 0); 1260 1261 context_desc->tucss = css; 1262 context_desc->tucso = cso; 1263 context_desc->tucse = 0; 1264 /* zero out any previously existing data in one instruction */ 1265 *(u32 *)&(context_desc->ipcss) = 0; 1266 context_desc->status = 0; 1267 context_desc->hdr_len = 0; 1268 context_desc->mss = 0; 1269 context_desc->cmd_type_len = 1270 cpu_to_le32(IXGB_CONTEXT_DESC_TYPE 1271 | IXGB_TX_DESC_CMD_IDE); 1272 1273 if (++i == adapter->tx_ring.count) i = 0; 1274 adapter->tx_ring.next_to_use = i; 1275 1276 return true; 1277 } 1278 1279 return false; 1280} 1281 1282#define IXGB_MAX_TXD_PWR 14 1283#define IXGB_MAX_DATA_PER_TXD (1<<IXGB_MAX_TXD_PWR) 1284 1285static int 1286ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb, 1287 unsigned int first) 1288{ 1289 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring; 1290 struct pci_dev *pdev = adapter->pdev; 1291 struct ixgb_buffer *buffer_info; 1292 int len = skb_headlen(skb); 1293 unsigned int offset = 0, size, count = 0, i; 1294 unsigned int mss = skb_shinfo(skb)->gso_size; 1295 unsigned int nr_frags = skb_shinfo(skb)->nr_frags; 1296 unsigned int f; 1297 1298 i = tx_ring->next_to_use; 1299 1300 while (len) { 1301 buffer_info = &tx_ring->buffer_info[i]; 1302 size = min(len, IXGB_MAX_DATA_PER_TXD); 1303 /* Workaround for premature desc write-backs 1304 * in TSO mode. Append 4-byte sentinel desc */ 1305 if (unlikely(mss && !nr_frags && size == len && size > 8)) 1306 size -= 4; 1307 1308 buffer_info->length = size; 1309 WARN_ON(buffer_info->dma != 0); 1310 buffer_info->time_stamp = jiffies; 1311 buffer_info->mapped_as_page = false; 1312 buffer_info->dma = dma_map_single(&pdev->dev, 1313 skb->data + offset, 1314 size, DMA_TO_DEVICE); 1315 if (dma_mapping_error(&pdev->dev, buffer_info->dma)) 1316 goto dma_error; 1317 buffer_info->next_to_watch = 0; 1318 1319 len -= size; 1320 offset += size; 1321 count++; 1322 if (len) { 1323 i++; 1324 if (i == tx_ring->count) 1325 i = 0; 1326 } 1327 } 1328 1329 for (f = 0; f < nr_frags; f++) { 1330 const skb_frag_t *frag = &skb_shinfo(skb)->frags[f]; 1331 len = skb_frag_size(frag); 1332 offset = 0; 1333 1334 while (len) { 1335 i++; 1336 if (i == tx_ring->count) 1337 i = 0; 1338 1339 buffer_info = &tx_ring->buffer_info[i]; 1340 size = min(len, IXGB_MAX_DATA_PER_TXD); 1341 1342 /* Workaround for premature desc write-backs 1343 * in TSO mode. Append 4-byte sentinel desc */ 1344 if (unlikely(mss && (f == (nr_frags - 1)) 1345 && size == len && size > 8)) 1346 size -= 4; 1347 1348 buffer_info->length = size; 1349 buffer_info->time_stamp = jiffies; 1350 buffer_info->mapped_as_page = true; 1351 buffer_info->dma = 1352 skb_frag_dma_map(&pdev->dev, frag, offset, size, 1353 DMA_TO_DEVICE); 1354 if (dma_mapping_error(&pdev->dev, buffer_info->dma)) 1355 goto dma_error; 1356 buffer_info->next_to_watch = 0; 1357 1358 len -= size; 1359 offset += size; 1360 count++; 1361 } 1362 } 1363 tx_ring->buffer_info[i].skb = skb; 1364 tx_ring->buffer_info[first].next_to_watch = i; 1365 1366 return count; 1367 1368dma_error: 1369 dev_err(&pdev->dev, "TX DMA map failed\n"); 1370 buffer_info->dma = 0; 1371 if (count) 1372 count--; 1373 1374 while (count--) { 1375 if (i==0) 1376 i += tx_ring->count; 1377 i--; 1378 buffer_info = &tx_ring->buffer_info[i]; 1379 ixgb_unmap_and_free_tx_resource(adapter, buffer_info); 1380 } 1381 1382 return 0; 1383} 1384 1385static void 1386ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags) 1387{ 1388 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring; 1389 struct ixgb_tx_desc *tx_desc = NULL; 1390 struct ixgb_buffer *buffer_info; 1391 u32 cmd_type_len = adapter->tx_cmd_type; 1392 u8 status = 0; 1393 u8 popts = 0; 1394 unsigned int i; 1395 1396 if (tx_flags & IXGB_TX_FLAGS_TSO) { 1397 cmd_type_len |= IXGB_TX_DESC_CMD_TSE; 1398 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM); 1399 } 1400 1401 if (tx_flags & IXGB_TX_FLAGS_CSUM) 1402 popts |= IXGB_TX_DESC_POPTS_TXSM; 1403 1404 if (tx_flags & IXGB_TX_FLAGS_VLAN) 1405 cmd_type_len |= IXGB_TX_DESC_CMD_VLE; 1406 1407 i = tx_ring->next_to_use; 1408 1409 while (count--) { 1410 buffer_info = &tx_ring->buffer_info[i]; 1411 tx_desc = IXGB_TX_DESC(*tx_ring, i); 1412 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma); 1413 tx_desc->cmd_type_len = 1414 cpu_to_le32(cmd_type_len | buffer_info->length); 1415 tx_desc->status = status; 1416 tx_desc->popts = popts; 1417 tx_desc->vlan = cpu_to_le16(vlan_id); 1418 1419 if (++i == tx_ring->count) i = 0; 1420 } 1421 1422 tx_desc->cmd_type_len |= 1423 cpu_to_le32(IXGB_TX_DESC_CMD_EOP | IXGB_TX_DESC_CMD_RS); 1424 1425 /* Force memory writes to complete before letting h/w 1426 * know there are new descriptors to fetch. (Only 1427 * applicable for weak-ordered memory model archs, 1428 * such as IA-64). */ 1429 wmb(); 1430 1431 tx_ring->next_to_use = i; 1432 IXGB_WRITE_REG(&adapter->hw, TDT, i); 1433} 1434 1435static int __ixgb_maybe_stop_tx(struct net_device *netdev, int size) 1436{ 1437 struct ixgb_adapter *adapter = netdev_priv(netdev); 1438 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring; 1439 1440 netif_stop_queue(netdev); 1441 /* Herbert's original patch had: 1442 * smp_mb__after_netif_stop_queue(); 1443 * but since that doesn't exist yet, just open code it. */ 1444 smp_mb(); 1445 1446 /* We need to check again in a case another CPU has just 1447 * made room available. */ 1448 if (likely(IXGB_DESC_UNUSED(tx_ring) < size)) 1449 return -EBUSY; 1450 1451 /* A reprieve! */ 1452 netif_start_queue(netdev); 1453 ++adapter->restart_queue; 1454 return 0; 1455} 1456 1457static int ixgb_maybe_stop_tx(struct net_device *netdev, 1458 struct ixgb_desc_ring *tx_ring, int size) 1459{ 1460 if (likely(IXGB_DESC_UNUSED(tx_ring) >= size)) 1461 return 0; 1462 return __ixgb_maybe_stop_tx(netdev, size); 1463} 1464 1465 1466/* Tx Descriptors needed, worst case */ 1467#define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \ 1468 (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0)) 1469#define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) /* skb->date */ + \ 1470 MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 /* for context */ \ 1471 + 1 /* one more needed for sentinel TSO workaround */ 1472 1473static netdev_tx_t 1474ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev) 1475{ 1476 struct ixgb_adapter *adapter = netdev_priv(netdev); 1477 unsigned int first; 1478 unsigned int tx_flags = 0; 1479 int vlan_id = 0; 1480 int count = 0; 1481 int tso; 1482 1483 if (test_bit(__IXGB_DOWN, &adapter->flags)) { 1484 dev_kfree_skb_any(skb); 1485 return NETDEV_TX_OK; 1486 } 1487 1488 if (skb->len <= 0) { 1489 dev_kfree_skb_any(skb); 1490 return NETDEV_TX_OK; 1491 } 1492 1493 if (unlikely(ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, 1494 DESC_NEEDED))) 1495 return NETDEV_TX_BUSY; 1496 1497 if (skb_vlan_tag_present(skb)) { 1498 tx_flags |= IXGB_TX_FLAGS_VLAN; 1499 vlan_id = skb_vlan_tag_get(skb); 1500 } 1501 1502 first = adapter->tx_ring.next_to_use; 1503 1504 tso = ixgb_tso(adapter, skb); 1505 if (tso < 0) { 1506 dev_kfree_skb_any(skb); 1507 return NETDEV_TX_OK; 1508 } 1509 1510 if (likely(tso)) 1511 tx_flags |= IXGB_TX_FLAGS_TSO; 1512 else if (ixgb_tx_csum(adapter, skb)) 1513 tx_flags |= IXGB_TX_FLAGS_CSUM; 1514 1515 count = ixgb_tx_map(adapter, skb, first); 1516 1517 if (count) { 1518 ixgb_tx_queue(adapter, count, vlan_id, tx_flags); 1519 /* Make sure there is space in the ring for the next send. */ 1520 ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED); 1521 1522 } else { 1523 dev_kfree_skb_any(skb); 1524 adapter->tx_ring.buffer_info[first].time_stamp = 0; 1525 adapter->tx_ring.next_to_use = first; 1526 } 1527 1528 return NETDEV_TX_OK; 1529} 1530 1531/** 1532 * ixgb_tx_timeout - Respond to a Tx Hang 1533 * @netdev: network interface device structure 1534 * @txqueue: queue hanging (unused) 1535 **/ 1536 1537static void 1538ixgb_tx_timeout(struct net_device *netdev, unsigned int __always_unused txqueue) 1539{ 1540 struct ixgb_adapter *adapter = netdev_priv(netdev); 1541 1542 /* Do the reset outside of interrupt context */ 1543 schedule_work(&adapter->tx_timeout_task); 1544} 1545 1546static void 1547ixgb_tx_timeout_task(struct work_struct *work) 1548{ 1549 struct ixgb_adapter *adapter = 1550 container_of(work, struct ixgb_adapter, tx_timeout_task); 1551 1552 adapter->tx_timeout_count++; 1553 ixgb_down(adapter, true); 1554 ixgb_up(adapter); 1555} 1556 1557/** 1558 * ixgb_change_mtu - Change the Maximum Transfer Unit 1559 * @netdev: network interface device structure 1560 * @new_mtu: new value for maximum frame size 1561 * 1562 * Returns 0 on success, negative on failure 1563 **/ 1564 1565static int 1566ixgb_change_mtu(struct net_device *netdev, int new_mtu) 1567{ 1568 struct ixgb_adapter *adapter = netdev_priv(netdev); 1569 int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH; 1570 1571 if (netif_running(netdev)) 1572 ixgb_down(adapter, true); 1573 1574 adapter->rx_buffer_len = max_frame + 8; /* + 8 for errata */ 1575 1576 netdev->mtu = new_mtu; 1577 1578 if (netif_running(netdev)) 1579 ixgb_up(adapter); 1580 1581 return 0; 1582} 1583 1584/** 1585 * ixgb_update_stats - Update the board statistics counters. 1586 * @adapter: board private structure 1587 **/ 1588 1589void 1590ixgb_update_stats(struct ixgb_adapter *adapter) 1591{ 1592 struct net_device *netdev = adapter->netdev; 1593 struct pci_dev *pdev = adapter->pdev; 1594 1595 /* Prevent stats update while adapter is being reset */ 1596 if (pci_channel_offline(pdev)) 1597 return; 1598 1599 if ((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) || 1600 (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) { 1601 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL); 1602 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL); 1603 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH); 1604 u64 bcast = ((u64)bcast_h << 32) | bcast_l; 1605 1606 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32); 1607 /* fix up multicast stats by removing broadcasts */ 1608 if (multi >= bcast) 1609 multi -= bcast; 1610 1611 adapter->stats.mprcl += (multi & 0xFFFFFFFF); 1612 adapter->stats.mprch += (multi >> 32); 1613 adapter->stats.bprcl += bcast_l; 1614 adapter->stats.bprch += bcast_h; 1615 } else { 1616 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL); 1617 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH); 1618 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL); 1619 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH); 1620 } 1621 adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL); 1622 adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH); 1623 adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL); 1624 adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH); 1625 adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL); 1626 adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH); 1627 adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL); 1628 adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH); 1629 adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL); 1630 adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH); 1631 adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL); 1632 adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH); 1633 adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL); 1634 adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH); 1635 adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC); 1636 adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC); 1637 adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC); 1638 adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC); 1639 adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS); 1640 adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC); 1641 adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC); 1642 adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC); 1643 adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL); 1644 adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH); 1645 adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL); 1646 adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH); 1647 adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL); 1648 adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH); 1649 adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL); 1650 adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH); 1651 adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL); 1652 adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH); 1653 adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL); 1654 adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH); 1655 adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL); 1656 adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH); 1657 adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL); 1658 adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH); 1659 adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL); 1660 adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH); 1661 adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC); 1662 adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C); 1663 adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC); 1664 adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC); 1665 adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC); 1666 adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC); 1667 adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC); 1668 adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC); 1669 adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC); 1670 adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC); 1671 adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC); 1672 adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC); 1673 adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC); 1674 adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC); 1675 adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC); 1676 adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC); 1677 1678 /* Fill out the OS statistics structure */ 1679 1680 netdev->stats.rx_packets = adapter->stats.gprcl; 1681 netdev->stats.tx_packets = adapter->stats.gptcl; 1682 netdev->stats.rx_bytes = adapter->stats.gorcl; 1683 netdev->stats.tx_bytes = adapter->stats.gotcl; 1684 netdev->stats.multicast = adapter->stats.mprcl; 1685 netdev->stats.collisions = 0; 1686 1687 /* ignore RLEC as it reports errors for padded (<64bytes) frames 1688 * with a length in the type/len field */ 1689 netdev->stats.rx_errors = 1690 /* adapter->stats.rnbc + */ adapter->stats.crcerrs + 1691 adapter->stats.ruc + 1692 adapter->stats.roc /*+ adapter->stats.rlec */ + 1693 adapter->stats.icbc + 1694 adapter->stats.ecbc + adapter->stats.mpc; 1695 1696 /* see above 1697 * netdev->stats.rx_length_errors = adapter->stats.rlec; 1698 */ 1699 1700 netdev->stats.rx_crc_errors = adapter->stats.crcerrs; 1701 netdev->stats.rx_fifo_errors = adapter->stats.mpc; 1702 netdev->stats.rx_missed_errors = adapter->stats.mpc; 1703 netdev->stats.rx_over_errors = adapter->stats.mpc; 1704 1705 netdev->stats.tx_errors = 0; 1706 netdev->stats.rx_frame_errors = 0; 1707 netdev->stats.tx_aborted_errors = 0; 1708 netdev->stats.tx_carrier_errors = 0; 1709 netdev->stats.tx_fifo_errors = 0; 1710 netdev->stats.tx_heartbeat_errors = 0; 1711 netdev->stats.tx_window_errors = 0; 1712} 1713 1714#define IXGB_MAX_INTR 10 1715/** 1716 * ixgb_intr - Interrupt Handler 1717 * @irq: interrupt number 1718 * @data: pointer to a network interface device structure 1719 **/ 1720 1721static irqreturn_t 1722ixgb_intr(int irq, void *data) 1723{ 1724 struct net_device *netdev = data; 1725 struct ixgb_adapter *adapter = netdev_priv(netdev); 1726 struct ixgb_hw *hw = &adapter->hw; 1727 u32 icr = IXGB_READ_REG(hw, ICR); 1728 1729 if (unlikely(!icr)) 1730 return IRQ_NONE; /* Not our interrupt */ 1731 1732 if (unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC))) 1733 if (!test_bit(__IXGB_DOWN, &adapter->flags)) 1734 mod_timer(&adapter->watchdog_timer, jiffies); 1735 1736 if (napi_schedule_prep(&adapter->napi)) { 1737 1738 /* Disable interrupts and register for poll. The flush 1739 of the posted write is intentionally left out. 1740 */ 1741 1742 IXGB_WRITE_REG(&adapter->hw, IMC, ~0); 1743 __napi_schedule(&adapter->napi); 1744 } 1745 return IRQ_HANDLED; 1746} 1747 1748/** 1749 * ixgb_clean - NAPI Rx polling callback 1750 * @napi: napi struct pointer 1751 * @budget: max number of receives to clean 1752 **/ 1753 1754static int 1755ixgb_clean(struct napi_struct *napi, int budget) 1756{ 1757 struct ixgb_adapter *adapter = container_of(napi, struct ixgb_adapter, napi); 1758 int work_done = 0; 1759 1760 ixgb_clean_tx_irq(adapter); 1761 ixgb_clean_rx_irq(adapter, &work_done, budget); 1762 1763 /* If budget not fully consumed, exit the polling mode */ 1764 if (work_done < budget) { 1765 napi_complete_done(napi, work_done); 1766 if (!test_bit(__IXGB_DOWN, &adapter->flags)) 1767 ixgb_irq_enable(adapter); 1768 } 1769 1770 return work_done; 1771} 1772 1773/** 1774 * ixgb_clean_tx_irq - Reclaim resources after transmit completes 1775 * @adapter: board private structure 1776 **/ 1777 1778static bool 1779ixgb_clean_tx_irq(struct ixgb_adapter *adapter) 1780{ 1781 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring; 1782 struct net_device *netdev = adapter->netdev; 1783 struct ixgb_tx_desc *tx_desc, *eop_desc; 1784 struct ixgb_buffer *buffer_info; 1785 unsigned int i, eop; 1786 bool cleaned = false; 1787 1788 i = tx_ring->next_to_clean; 1789 eop = tx_ring->buffer_info[i].next_to_watch; 1790 eop_desc = IXGB_TX_DESC(*tx_ring, eop); 1791 1792 while (eop_desc->status & IXGB_TX_DESC_STATUS_DD) { 1793 1794 rmb(); /* read buffer_info after eop_desc */ 1795 for (cleaned = false; !cleaned; ) { 1796 tx_desc = IXGB_TX_DESC(*tx_ring, i); 1797 buffer_info = &tx_ring->buffer_info[i]; 1798 1799 if (tx_desc->popts & 1800 (IXGB_TX_DESC_POPTS_TXSM | 1801 IXGB_TX_DESC_POPTS_IXSM)) 1802 adapter->hw_csum_tx_good++; 1803 1804 ixgb_unmap_and_free_tx_resource(adapter, buffer_info); 1805 1806 *(u32 *)&(tx_desc->status) = 0; 1807 1808 cleaned = (i == eop); 1809 if (++i == tx_ring->count) i = 0; 1810 } 1811 1812 eop = tx_ring->buffer_info[i].next_to_watch; 1813 eop_desc = IXGB_TX_DESC(*tx_ring, eop); 1814 } 1815 1816 tx_ring->next_to_clean = i; 1817 1818 if (unlikely(cleaned && netif_carrier_ok(netdev) && 1819 IXGB_DESC_UNUSED(tx_ring) >= DESC_NEEDED)) { 1820 /* Make sure that anybody stopping the queue after this 1821 * sees the new next_to_clean. */ 1822 smp_mb(); 1823 1824 if (netif_queue_stopped(netdev) && 1825 !(test_bit(__IXGB_DOWN, &adapter->flags))) { 1826 netif_wake_queue(netdev); 1827 ++adapter->restart_queue; 1828 } 1829 } 1830 1831 if (adapter->detect_tx_hung) { 1832 /* detect a transmit hang in hardware, this serializes the 1833 * check with the clearing of time_stamp and movement of i */ 1834 adapter->detect_tx_hung = false; 1835 if (tx_ring->buffer_info[eop].time_stamp && 1836 time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ) 1837 && !(IXGB_READ_REG(&adapter->hw, STATUS) & 1838 IXGB_STATUS_TXOFF)) { 1839 /* detected Tx unit hang */ 1840 netif_err(adapter, drv, adapter->netdev, 1841 "Detected Tx Unit Hang\n" 1842 " TDH <%x>\n" 1843 " TDT <%x>\n" 1844 " next_to_use <%x>\n" 1845 " next_to_clean <%x>\n" 1846 "buffer_info[next_to_clean]\n" 1847 " time_stamp <%lx>\n" 1848 " next_to_watch <%x>\n" 1849 " jiffies <%lx>\n" 1850 " next_to_watch.status <%x>\n", 1851 IXGB_READ_REG(&adapter->hw, TDH), 1852 IXGB_READ_REG(&adapter->hw, TDT), 1853 tx_ring->next_to_use, 1854 tx_ring->next_to_clean, 1855 tx_ring->buffer_info[eop].time_stamp, 1856 eop, 1857 jiffies, 1858 eop_desc->status); 1859 netif_stop_queue(netdev); 1860 } 1861 } 1862 1863 return cleaned; 1864} 1865 1866/** 1867 * ixgb_rx_checksum - Receive Checksum Offload for 82597. 1868 * @adapter: board private structure 1869 * @rx_desc: receive descriptor 1870 * @skb: socket buffer with received data 1871 **/ 1872 1873static void 1874ixgb_rx_checksum(struct ixgb_adapter *adapter, 1875 struct ixgb_rx_desc *rx_desc, 1876 struct sk_buff *skb) 1877{ 1878 /* Ignore Checksum bit is set OR 1879 * TCP Checksum has not been calculated 1880 */ 1881 if ((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) || 1882 (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) { 1883 skb_checksum_none_assert(skb); 1884 return; 1885 } 1886 1887 /* At this point we know the hardware did the TCP checksum */ 1888 /* now look at the TCP checksum error bit */ 1889 if (rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) { 1890 /* let the stack verify checksum errors */ 1891 skb_checksum_none_assert(skb); 1892 adapter->hw_csum_rx_error++; 1893 } else { 1894 /* TCP checksum is good */ 1895 skb->ip_summed = CHECKSUM_UNNECESSARY; 1896 adapter->hw_csum_rx_good++; 1897 } 1898} 1899 1900/* 1901 * this should improve performance for small packets with large amounts 1902 * of reassembly being done in the stack 1903 */ 1904static void ixgb_check_copybreak(struct napi_struct *napi, 1905 struct ixgb_buffer *buffer_info, 1906 u32 length, struct sk_buff **skb) 1907{ 1908 struct sk_buff *new_skb; 1909 1910 if (length > copybreak) 1911 return; 1912 1913 new_skb = napi_alloc_skb(napi, length); 1914 if (!new_skb) 1915 return; 1916 1917 skb_copy_to_linear_data_offset(new_skb, -NET_IP_ALIGN, 1918 (*skb)->data - NET_IP_ALIGN, 1919 length + NET_IP_ALIGN); 1920 /* save the skb in buffer_info as good */ 1921 buffer_info->skb = *skb; 1922 *skb = new_skb; 1923} 1924 1925/** 1926 * ixgb_clean_rx_irq - Send received data up the network stack, 1927 * @adapter: board private structure 1928 * @work_done: output pointer to amount of packets cleaned 1929 * @work_to_do: how much work we can complete 1930 **/ 1931 1932static bool 1933ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do) 1934{ 1935 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring; 1936 struct net_device *netdev = adapter->netdev; 1937 struct pci_dev *pdev = adapter->pdev; 1938 struct ixgb_rx_desc *rx_desc, *next_rxd; 1939 struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer; 1940 u32 length; 1941 unsigned int i, j; 1942 int cleaned_count = 0; 1943 bool cleaned = false; 1944 1945 i = rx_ring->next_to_clean; 1946 rx_desc = IXGB_RX_DESC(*rx_ring, i); 1947 buffer_info = &rx_ring->buffer_info[i]; 1948 1949 while (rx_desc->status & IXGB_RX_DESC_STATUS_DD) { 1950 struct sk_buff *skb; 1951 u8 status; 1952 1953 if (*work_done >= work_to_do) 1954 break; 1955 1956 (*work_done)++; 1957 rmb(); /* read descriptor and rx_buffer_info after status DD */ 1958 status = rx_desc->status; 1959 skb = buffer_info->skb; 1960 buffer_info->skb = NULL; 1961 1962 prefetch(skb->data - NET_IP_ALIGN); 1963 1964 if (++i == rx_ring->count) 1965 i = 0; 1966 next_rxd = IXGB_RX_DESC(*rx_ring, i); 1967 prefetch(next_rxd); 1968 1969 j = i + 1; 1970 if (j == rx_ring->count) 1971 j = 0; 1972 next2_buffer = &rx_ring->buffer_info[j]; 1973 prefetch(next2_buffer); 1974 1975 next_buffer = &rx_ring->buffer_info[i]; 1976 1977 cleaned = true; 1978 cleaned_count++; 1979 1980 dma_unmap_single(&pdev->dev, 1981 buffer_info->dma, 1982 buffer_info->length, 1983 DMA_FROM_DEVICE); 1984 buffer_info->dma = 0; 1985 1986 length = le16_to_cpu(rx_desc->length); 1987 rx_desc->length = 0; 1988 1989 if (unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) { 1990 1991 /* All receives must fit into a single buffer */ 1992 1993 pr_debug("Receive packet consumed multiple buffers length<%x>\n", 1994 length); 1995 1996 dev_kfree_skb_irq(skb); 1997 goto rxdesc_done; 1998 } 1999 2000 if (unlikely(rx_desc->errors & 2001 (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE | 2002 IXGB_RX_DESC_ERRORS_P | IXGB_RX_DESC_ERRORS_RXE))) { 2003 dev_kfree_skb_irq(skb); 2004 goto rxdesc_done; 2005 } 2006 2007 ixgb_check_copybreak(&adapter->napi, buffer_info, length, &skb); 2008 2009 /* Good Receive */ 2010 skb_put(skb, length); 2011 2012 /* Receive Checksum Offload */ 2013 ixgb_rx_checksum(adapter, rx_desc, skb); 2014 2015 skb->protocol = eth_type_trans(skb, netdev); 2016 if (status & IXGB_RX_DESC_STATUS_VP) 2017 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), 2018 le16_to_cpu(rx_desc->special)); 2019 2020 netif_receive_skb(skb); 2021 2022rxdesc_done: 2023 /* clean up descriptor, might be written over by hw */ 2024 rx_desc->status = 0; 2025 2026 /* return some buffers to hardware, one at a time is too slow */ 2027 if (unlikely(cleaned_count >= IXGB_RX_BUFFER_WRITE)) { 2028 ixgb_alloc_rx_buffers(adapter, cleaned_count); 2029 cleaned_count = 0; 2030 } 2031 2032 /* use prefetched values */ 2033 rx_desc = next_rxd; 2034 buffer_info = next_buffer; 2035 } 2036 2037 rx_ring->next_to_clean = i; 2038 2039 cleaned_count = IXGB_DESC_UNUSED(rx_ring); 2040 if (cleaned_count) 2041 ixgb_alloc_rx_buffers(adapter, cleaned_count); 2042 2043 return cleaned; 2044} 2045 2046/** 2047 * ixgb_alloc_rx_buffers - Replace used receive buffers 2048 * @adapter: address of board private structure 2049 * @cleaned_count: how many buffers to allocate 2050 **/ 2051 2052static void 2053ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter, int cleaned_count) 2054{ 2055 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring; 2056 struct net_device *netdev = adapter->netdev; 2057 struct pci_dev *pdev = adapter->pdev; 2058 struct ixgb_rx_desc *rx_desc; 2059 struct ixgb_buffer *buffer_info; 2060 struct sk_buff *skb; 2061 unsigned int i; 2062 long cleancount; 2063 2064 i = rx_ring->next_to_use; 2065 buffer_info = &rx_ring->buffer_info[i]; 2066 cleancount = IXGB_DESC_UNUSED(rx_ring); 2067 2068 2069 /* leave three descriptors unused */ 2070 while (--cleancount > 2 && cleaned_count--) { 2071 /* recycle! its good for you */ 2072 skb = buffer_info->skb; 2073 if (skb) { 2074 skb_trim(skb, 0); 2075 goto map_skb; 2076 } 2077 2078 skb = netdev_alloc_skb_ip_align(netdev, adapter->rx_buffer_len); 2079 if (unlikely(!skb)) { 2080 /* Better luck next round */ 2081 adapter->alloc_rx_buff_failed++; 2082 break; 2083 } 2084 2085 buffer_info->skb = skb; 2086 buffer_info->length = adapter->rx_buffer_len; 2087map_skb: 2088 buffer_info->dma = dma_map_single(&pdev->dev, 2089 skb->data, 2090 adapter->rx_buffer_len, 2091 DMA_FROM_DEVICE); 2092 if (dma_mapping_error(&pdev->dev, buffer_info->dma)) { 2093 adapter->alloc_rx_buff_failed++; 2094 break; 2095 } 2096 2097 rx_desc = IXGB_RX_DESC(*rx_ring, i); 2098 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma); 2099 /* guarantee DD bit not set now before h/w gets descriptor 2100 * this is the rest of the workaround for h/w double 2101 * writeback. */ 2102 rx_desc->status = 0; 2103 2104 2105 if (++i == rx_ring->count) 2106 i = 0; 2107 buffer_info = &rx_ring->buffer_info[i]; 2108 } 2109 2110 if (likely(rx_ring->next_to_use != i)) { 2111 rx_ring->next_to_use = i; 2112 if (unlikely(i-- == 0)) 2113 i = (rx_ring->count - 1); 2114 2115 /* Force memory writes to complete before letting h/w 2116 * know there are new descriptors to fetch. (Only 2117 * applicable for weak-ordered memory model archs, such 2118 * as IA-64). */ 2119 wmb(); 2120 IXGB_WRITE_REG(&adapter->hw, RDT, i); 2121 } 2122} 2123 2124static void 2125ixgb_vlan_strip_enable(struct ixgb_adapter *adapter) 2126{ 2127 u32 ctrl; 2128 2129 /* enable VLAN tag insert/strip */ 2130 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0); 2131 ctrl |= IXGB_CTRL0_VME; 2132 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl); 2133} 2134 2135static void 2136ixgb_vlan_strip_disable(struct ixgb_adapter *adapter) 2137{ 2138 u32 ctrl; 2139 2140 /* disable VLAN tag insert/strip */ 2141 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0); 2142 ctrl &= ~IXGB_CTRL0_VME; 2143 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl); 2144} 2145 2146static int 2147ixgb_vlan_rx_add_vid(struct net_device *netdev, __be16 proto, u16 vid) 2148{ 2149 struct ixgb_adapter *adapter = netdev_priv(netdev); 2150 u32 vfta, index; 2151 2152 /* add VID to filter table */ 2153 2154 index = (vid >> 5) & 0x7F; 2155 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index); 2156 vfta |= (1 << (vid & 0x1F)); 2157 ixgb_write_vfta(&adapter->hw, index, vfta); 2158 set_bit(vid, adapter->active_vlans); 2159 2160 return 0; 2161} 2162 2163static int 2164ixgb_vlan_rx_kill_vid(struct net_device *netdev, __be16 proto, u16 vid) 2165{ 2166 struct ixgb_adapter *adapter = netdev_priv(netdev); 2167 u32 vfta, index; 2168 2169 /* remove VID from filter table */ 2170 2171 index = (vid >> 5) & 0x7F; 2172 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index); 2173 vfta &= ~(1 << (vid & 0x1F)); 2174 ixgb_write_vfta(&adapter->hw, index, vfta); 2175 clear_bit(vid, adapter->active_vlans); 2176 2177 return 0; 2178} 2179 2180static void 2181ixgb_restore_vlan(struct ixgb_adapter *adapter) 2182{ 2183 u16 vid; 2184 2185 for_each_set_bit(vid, adapter->active_vlans, VLAN_N_VID) 2186 ixgb_vlan_rx_add_vid(adapter->netdev, htons(ETH_P_8021Q), vid); 2187} 2188 2189/** 2190 * ixgb_io_error_detected - called when PCI error is detected 2191 * @pdev: pointer to pci device with error 2192 * @state: pci channel state after error 2193 * 2194 * This callback is called by the PCI subsystem whenever 2195 * a PCI bus error is detected. 2196 */ 2197static pci_ers_result_t ixgb_io_error_detected(struct pci_dev *pdev, 2198 pci_channel_state_t state) 2199{ 2200 struct net_device *netdev = pci_get_drvdata(pdev); 2201 struct ixgb_adapter *adapter = netdev_priv(netdev); 2202 2203 netif_device_detach(netdev); 2204 2205 if (state == pci_channel_io_perm_failure) 2206 return PCI_ERS_RESULT_DISCONNECT; 2207 2208 if (netif_running(netdev)) 2209 ixgb_down(adapter, true); 2210 2211 pci_disable_device(pdev); 2212 2213 /* Request a slot reset. */ 2214 return PCI_ERS_RESULT_NEED_RESET; 2215} 2216 2217/** 2218 * ixgb_io_slot_reset - called after the pci bus has been reset. 2219 * @pdev: pointer to pci device with error 2220 * 2221 * This callback is called after the PCI bus has been reset. 2222 * Basically, this tries to restart the card from scratch. 2223 * This is a shortened version of the device probe/discovery code, 2224 * it resembles the first-half of the ixgb_probe() routine. 2225 */ 2226static pci_ers_result_t ixgb_io_slot_reset(struct pci_dev *pdev) 2227{ 2228 struct net_device *netdev = pci_get_drvdata(pdev); 2229 struct ixgb_adapter *adapter = netdev_priv(netdev); 2230 2231 if (pci_enable_device(pdev)) { 2232 netif_err(adapter, probe, adapter->netdev, 2233 "Cannot re-enable PCI device after reset\n"); 2234 return PCI_ERS_RESULT_DISCONNECT; 2235 } 2236 2237 /* Perform card reset only on one instance of the card */ 2238 if (0 != PCI_FUNC (pdev->devfn)) 2239 return PCI_ERS_RESULT_RECOVERED; 2240 2241 pci_set_master(pdev); 2242 2243 netif_carrier_off(netdev); 2244 netif_stop_queue(netdev); 2245 ixgb_reset(adapter); 2246 2247 /* Make sure the EEPROM is good */ 2248 if (!ixgb_validate_eeprom_checksum(&adapter->hw)) { 2249 netif_err(adapter, probe, adapter->netdev, 2250 "After reset, the EEPROM checksum is not valid\n"); 2251 return PCI_ERS_RESULT_DISCONNECT; 2252 } 2253 ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr); 2254 memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len); 2255 2256 if (!is_valid_ether_addr(netdev->perm_addr)) { 2257 netif_err(adapter, probe, adapter->netdev, 2258 "After reset, invalid MAC address\n"); 2259 return PCI_ERS_RESULT_DISCONNECT; 2260 } 2261 2262 return PCI_ERS_RESULT_RECOVERED; 2263} 2264 2265/** 2266 * ixgb_io_resume - called when its OK to resume normal operations 2267 * @pdev: pointer to pci device with error 2268 * 2269 * The error recovery driver tells us that its OK to resume 2270 * normal operation. Implementation resembles the second-half 2271 * of the ixgb_probe() routine. 2272 */ 2273static void ixgb_io_resume(struct pci_dev *pdev) 2274{ 2275 struct net_device *netdev = pci_get_drvdata(pdev); 2276 struct ixgb_adapter *adapter = netdev_priv(netdev); 2277 2278 pci_set_master(pdev); 2279 2280 if (netif_running(netdev)) { 2281 if (ixgb_up(adapter)) { 2282 pr_err("can't bring device back up after reset\n"); 2283 return; 2284 } 2285 } 2286 2287 netif_device_attach(netdev); 2288 mod_timer(&adapter->watchdog_timer, jiffies); 2289} 2290 2291/* ixgb_main.c */ 2292