ixgb_main.c revision f646968f8f7c624587de729115d802372b9063dd
1/******************************************************************************* 2 3 Intel PRO/10GbE Linux driver 4 Copyright(c) 1999 - 2008 Intel Corporation. 5 6 This program is free software; you can redistribute it and/or modify it 7 under the terms and conditions of the GNU General Public License, 8 version 2, as published by the Free Software Foundation. 9 10 This program is distributed in the hope it will be useful, but WITHOUT 11 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 13 more details. 14 15 You should have received a copy of the GNU General Public License along with 16 this program; if not, write to the Free Software Foundation, Inc., 17 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. 18 19 The full GNU General Public License is included in this distribution in 20 the file called "COPYING". 21 22 Contact Information: 23 Linux NICS <linux.nics@intel.com> 24 e1000-devel Mailing List <e1000-devel@lists.sourceforge.net> 25 Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 26 27*******************************************************************************/ 28 29#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 30 31#include <linux/prefetch.h> 32#include "ixgb.h" 33 34char ixgb_driver_name[] = "ixgb"; 35static char ixgb_driver_string[] = "Intel(R) PRO/10GbE Network Driver"; 36 37#define DRIVERNAPI "-NAPI" 38#define DRV_VERSION "1.0.135-k2" DRIVERNAPI 39const char ixgb_driver_version[] = DRV_VERSION; 40static const char ixgb_copyright[] = "Copyright (c) 1999-2008 Intel Corporation."; 41 42#define IXGB_CB_LENGTH 256 43static unsigned int copybreak __read_mostly = IXGB_CB_LENGTH; 44module_param(copybreak, uint, 0644); 45MODULE_PARM_DESC(copybreak, 46 "Maximum size of packet that is copied to a new buffer on receive"); 47 48/* ixgb_pci_tbl - PCI Device ID Table 49 * 50 * Wildcard entries (PCI_ANY_ID) should come last 51 * Last entry must be all 0s 52 * 53 * { Vendor ID, Device ID, SubVendor ID, SubDevice ID, 54 * Class, Class Mask, private data (not used) } 55 */ 56static DEFINE_PCI_DEVICE_TABLE(ixgb_pci_tbl) = { 57 {PCI_VENDOR_ID_INTEL, IXGB_DEVICE_ID_82597EX, 58 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0}, 59 {PCI_VENDOR_ID_INTEL, IXGB_DEVICE_ID_82597EX_CX4, 60 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0}, 61 {PCI_VENDOR_ID_INTEL, IXGB_DEVICE_ID_82597EX_SR, 62 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0}, 63 {PCI_VENDOR_ID_INTEL, IXGB_DEVICE_ID_82597EX_LR, 64 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0}, 65 66 /* required last entry */ 67 {0,} 68}; 69 70MODULE_DEVICE_TABLE(pci, ixgb_pci_tbl); 71 72/* Local Function Prototypes */ 73static int ixgb_init_module(void); 74static void ixgb_exit_module(void); 75static int ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent); 76static void ixgb_remove(struct pci_dev *pdev); 77static int ixgb_sw_init(struct ixgb_adapter *adapter); 78static int ixgb_open(struct net_device *netdev); 79static int ixgb_close(struct net_device *netdev); 80static void ixgb_configure_tx(struct ixgb_adapter *adapter); 81static void ixgb_configure_rx(struct ixgb_adapter *adapter); 82static void ixgb_setup_rctl(struct ixgb_adapter *adapter); 83static void ixgb_clean_tx_ring(struct ixgb_adapter *adapter); 84static void ixgb_clean_rx_ring(struct ixgb_adapter *adapter); 85static void ixgb_set_multi(struct net_device *netdev); 86static void ixgb_watchdog(unsigned long data); 87static netdev_tx_t ixgb_xmit_frame(struct sk_buff *skb, 88 struct net_device *netdev); 89static struct net_device_stats *ixgb_get_stats(struct net_device *netdev); 90static int ixgb_change_mtu(struct net_device *netdev, int new_mtu); 91static int ixgb_set_mac(struct net_device *netdev, void *p); 92static irqreturn_t ixgb_intr(int irq, void *data); 93static bool ixgb_clean_tx_irq(struct ixgb_adapter *adapter); 94 95static int ixgb_clean(struct napi_struct *, int); 96static bool ixgb_clean_rx_irq(struct ixgb_adapter *, int *, int); 97static void ixgb_alloc_rx_buffers(struct ixgb_adapter *, int); 98 99static void ixgb_tx_timeout(struct net_device *dev); 100static void ixgb_tx_timeout_task(struct work_struct *work); 101 102static void ixgb_vlan_strip_enable(struct ixgb_adapter *adapter); 103static void ixgb_vlan_strip_disable(struct ixgb_adapter *adapter); 104static int ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid); 105static int ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid); 106static void ixgb_restore_vlan(struct ixgb_adapter *adapter); 107 108#ifdef CONFIG_NET_POLL_CONTROLLER 109/* for netdump / net console */ 110static void ixgb_netpoll(struct net_device *dev); 111#endif 112 113static pci_ers_result_t ixgb_io_error_detected (struct pci_dev *pdev, 114 enum pci_channel_state state); 115static pci_ers_result_t ixgb_io_slot_reset (struct pci_dev *pdev); 116static void ixgb_io_resume (struct pci_dev *pdev); 117 118static const struct pci_error_handlers ixgb_err_handler = { 119 .error_detected = ixgb_io_error_detected, 120 .slot_reset = ixgb_io_slot_reset, 121 .resume = ixgb_io_resume, 122}; 123 124static struct pci_driver ixgb_driver = { 125 .name = ixgb_driver_name, 126 .id_table = ixgb_pci_tbl, 127 .probe = ixgb_probe, 128 .remove = ixgb_remove, 129 .err_handler = &ixgb_err_handler 130}; 131 132MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>"); 133MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver"); 134MODULE_LICENSE("GPL"); 135MODULE_VERSION(DRV_VERSION); 136 137#define DEFAULT_MSG_ENABLE (NETIF_MSG_DRV|NETIF_MSG_PROBE|NETIF_MSG_LINK) 138static int debug = -1; 139module_param(debug, int, 0); 140MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)"); 141 142/** 143 * ixgb_init_module - Driver Registration Routine 144 * 145 * ixgb_init_module is the first routine called when the driver is 146 * loaded. All it does is register with the PCI subsystem. 147 **/ 148 149static int __init 150ixgb_init_module(void) 151{ 152 pr_info("%s - version %s\n", ixgb_driver_string, ixgb_driver_version); 153 pr_info("%s\n", ixgb_copyright); 154 155 return pci_register_driver(&ixgb_driver); 156} 157 158module_init(ixgb_init_module); 159 160/** 161 * ixgb_exit_module - Driver Exit Cleanup Routine 162 * 163 * ixgb_exit_module is called just before the driver is removed 164 * from memory. 165 **/ 166 167static void __exit 168ixgb_exit_module(void) 169{ 170 pci_unregister_driver(&ixgb_driver); 171} 172 173module_exit(ixgb_exit_module); 174 175/** 176 * ixgb_irq_disable - Mask off interrupt generation on the NIC 177 * @adapter: board private structure 178 **/ 179 180static void 181ixgb_irq_disable(struct ixgb_adapter *adapter) 182{ 183 IXGB_WRITE_REG(&adapter->hw, IMC, ~0); 184 IXGB_WRITE_FLUSH(&adapter->hw); 185 synchronize_irq(adapter->pdev->irq); 186} 187 188/** 189 * ixgb_irq_enable - Enable default interrupt generation settings 190 * @adapter: board private structure 191 **/ 192 193static void 194ixgb_irq_enable(struct ixgb_adapter *adapter) 195{ 196 u32 val = IXGB_INT_RXT0 | IXGB_INT_RXDMT0 | 197 IXGB_INT_TXDW | IXGB_INT_LSC; 198 if (adapter->hw.subsystem_vendor_id == PCI_VENDOR_ID_SUN) 199 val |= IXGB_INT_GPI0; 200 IXGB_WRITE_REG(&adapter->hw, IMS, val); 201 IXGB_WRITE_FLUSH(&adapter->hw); 202} 203 204int 205ixgb_up(struct ixgb_adapter *adapter) 206{ 207 struct net_device *netdev = adapter->netdev; 208 int err, irq_flags = IRQF_SHARED; 209 int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH; 210 struct ixgb_hw *hw = &adapter->hw; 211 212 /* hardware has been reset, we need to reload some things */ 213 214 ixgb_rar_set(hw, netdev->dev_addr, 0); 215 ixgb_set_multi(netdev); 216 217 ixgb_restore_vlan(adapter); 218 219 ixgb_configure_tx(adapter); 220 ixgb_setup_rctl(adapter); 221 ixgb_configure_rx(adapter); 222 ixgb_alloc_rx_buffers(adapter, IXGB_DESC_UNUSED(&adapter->rx_ring)); 223 224 /* disable interrupts and get the hardware into a known state */ 225 IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff); 226 227 /* only enable MSI if bus is in PCI-X mode */ 228 if (IXGB_READ_REG(&adapter->hw, STATUS) & IXGB_STATUS_PCIX_MODE) { 229 err = pci_enable_msi(adapter->pdev); 230 if (!err) { 231 adapter->have_msi = true; 232 irq_flags = 0; 233 } 234 /* proceed to try to request regular interrupt */ 235 } 236 237 err = request_irq(adapter->pdev->irq, ixgb_intr, irq_flags, 238 netdev->name, netdev); 239 if (err) { 240 if (adapter->have_msi) 241 pci_disable_msi(adapter->pdev); 242 netif_err(adapter, probe, adapter->netdev, 243 "Unable to allocate interrupt Error: %d\n", err); 244 return err; 245 } 246 247 if ((hw->max_frame_size != max_frame) || 248 (hw->max_frame_size != 249 (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) { 250 251 hw->max_frame_size = max_frame; 252 253 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT); 254 255 if (hw->max_frame_size > 256 IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) { 257 u32 ctrl0 = IXGB_READ_REG(hw, CTRL0); 258 259 if (!(ctrl0 & IXGB_CTRL0_JFE)) { 260 ctrl0 |= IXGB_CTRL0_JFE; 261 IXGB_WRITE_REG(hw, CTRL0, ctrl0); 262 } 263 } 264 } 265 266 clear_bit(__IXGB_DOWN, &adapter->flags); 267 268 napi_enable(&adapter->napi); 269 ixgb_irq_enable(adapter); 270 271 netif_wake_queue(netdev); 272 273 mod_timer(&adapter->watchdog_timer, jiffies); 274 275 return 0; 276} 277 278void 279ixgb_down(struct ixgb_adapter *adapter, bool kill_watchdog) 280{ 281 struct net_device *netdev = adapter->netdev; 282 283 /* prevent the interrupt handler from restarting watchdog */ 284 set_bit(__IXGB_DOWN, &adapter->flags); 285 286 napi_disable(&adapter->napi); 287 /* waiting for NAPI to complete can re-enable interrupts */ 288 ixgb_irq_disable(adapter); 289 free_irq(adapter->pdev->irq, netdev); 290 291 if (adapter->have_msi) 292 pci_disable_msi(adapter->pdev); 293 294 if (kill_watchdog) 295 del_timer_sync(&adapter->watchdog_timer); 296 297 adapter->link_speed = 0; 298 adapter->link_duplex = 0; 299 netif_carrier_off(netdev); 300 netif_stop_queue(netdev); 301 302 ixgb_reset(adapter); 303 ixgb_clean_tx_ring(adapter); 304 ixgb_clean_rx_ring(adapter); 305} 306 307void 308ixgb_reset(struct ixgb_adapter *adapter) 309{ 310 struct ixgb_hw *hw = &adapter->hw; 311 312 ixgb_adapter_stop(hw); 313 if (!ixgb_init_hw(hw)) 314 netif_err(adapter, probe, adapter->netdev, "ixgb_init_hw failed\n"); 315 316 /* restore frame size information */ 317 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT); 318 if (hw->max_frame_size > 319 IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) { 320 u32 ctrl0 = IXGB_READ_REG(hw, CTRL0); 321 if (!(ctrl0 & IXGB_CTRL0_JFE)) { 322 ctrl0 |= IXGB_CTRL0_JFE; 323 IXGB_WRITE_REG(hw, CTRL0, ctrl0); 324 } 325 } 326} 327 328static netdev_features_t 329ixgb_fix_features(struct net_device *netdev, netdev_features_t features) 330{ 331 /* 332 * Tx VLAN insertion does not work per HW design when Rx stripping is 333 * disabled. 334 */ 335 if (!(features & NETIF_F_HW_VLAN_CTAG_RX)) 336 features &= ~NETIF_F_HW_VLAN_CTAG_TX; 337 338 return features; 339} 340 341static int 342ixgb_set_features(struct net_device *netdev, netdev_features_t features) 343{ 344 struct ixgb_adapter *adapter = netdev_priv(netdev); 345 netdev_features_t changed = features ^ netdev->features; 346 347 if (!(changed & (NETIF_F_RXCSUM|NETIF_F_HW_VLAN_CTAG_RX))) 348 return 0; 349 350 adapter->rx_csum = !!(features & NETIF_F_RXCSUM); 351 352 if (netif_running(netdev)) { 353 ixgb_down(adapter, true); 354 ixgb_up(adapter); 355 ixgb_set_speed_duplex(netdev); 356 } else 357 ixgb_reset(adapter); 358 359 return 0; 360} 361 362 363static const struct net_device_ops ixgb_netdev_ops = { 364 .ndo_open = ixgb_open, 365 .ndo_stop = ixgb_close, 366 .ndo_start_xmit = ixgb_xmit_frame, 367 .ndo_get_stats = ixgb_get_stats, 368 .ndo_set_rx_mode = ixgb_set_multi, 369 .ndo_validate_addr = eth_validate_addr, 370 .ndo_set_mac_address = ixgb_set_mac, 371 .ndo_change_mtu = ixgb_change_mtu, 372 .ndo_tx_timeout = ixgb_tx_timeout, 373 .ndo_vlan_rx_add_vid = ixgb_vlan_rx_add_vid, 374 .ndo_vlan_rx_kill_vid = ixgb_vlan_rx_kill_vid, 375#ifdef CONFIG_NET_POLL_CONTROLLER 376 .ndo_poll_controller = ixgb_netpoll, 377#endif 378 .ndo_fix_features = ixgb_fix_features, 379 .ndo_set_features = ixgb_set_features, 380}; 381 382/** 383 * ixgb_probe - Device Initialization Routine 384 * @pdev: PCI device information struct 385 * @ent: entry in ixgb_pci_tbl 386 * 387 * Returns 0 on success, negative on failure 388 * 389 * ixgb_probe initializes an adapter identified by a pci_dev structure. 390 * The OS initialization, configuring of the adapter private structure, 391 * and a hardware reset occur. 392 **/ 393 394static int 395ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent) 396{ 397 struct net_device *netdev = NULL; 398 struct ixgb_adapter *adapter; 399 static int cards_found = 0; 400 int pci_using_dac; 401 int i; 402 int err; 403 404 err = pci_enable_device(pdev); 405 if (err) 406 return err; 407 408 pci_using_dac = 0; 409 err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(64)); 410 if (!err) { 411 err = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64)); 412 if (!err) 413 pci_using_dac = 1; 414 } else { 415 err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32)); 416 if (err) { 417 err = dma_set_coherent_mask(&pdev->dev, 418 DMA_BIT_MASK(32)); 419 if (err) { 420 pr_err("No usable DMA configuration, aborting\n"); 421 goto err_dma_mask; 422 } 423 } 424 } 425 426 err = pci_request_regions(pdev, ixgb_driver_name); 427 if (err) 428 goto err_request_regions; 429 430 pci_set_master(pdev); 431 432 netdev = alloc_etherdev(sizeof(struct ixgb_adapter)); 433 if (!netdev) { 434 err = -ENOMEM; 435 goto err_alloc_etherdev; 436 } 437 438 SET_NETDEV_DEV(netdev, &pdev->dev); 439 440 pci_set_drvdata(pdev, netdev); 441 adapter = netdev_priv(netdev); 442 adapter->netdev = netdev; 443 adapter->pdev = pdev; 444 adapter->hw.back = adapter; 445 adapter->msg_enable = netif_msg_init(debug, DEFAULT_MSG_ENABLE); 446 447 adapter->hw.hw_addr = pci_ioremap_bar(pdev, BAR_0); 448 if (!adapter->hw.hw_addr) { 449 err = -EIO; 450 goto err_ioremap; 451 } 452 453 for (i = BAR_1; i <= BAR_5; i++) { 454 if (pci_resource_len(pdev, i) == 0) 455 continue; 456 if (pci_resource_flags(pdev, i) & IORESOURCE_IO) { 457 adapter->hw.io_base = pci_resource_start(pdev, i); 458 break; 459 } 460 } 461 462 netdev->netdev_ops = &ixgb_netdev_ops; 463 ixgb_set_ethtool_ops(netdev); 464 netdev->watchdog_timeo = 5 * HZ; 465 netif_napi_add(netdev, &adapter->napi, ixgb_clean, 64); 466 467 strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1); 468 469 adapter->bd_number = cards_found; 470 adapter->link_speed = 0; 471 adapter->link_duplex = 0; 472 473 /* setup the private structure */ 474 475 err = ixgb_sw_init(adapter); 476 if (err) 477 goto err_sw_init; 478 479 netdev->hw_features = NETIF_F_SG | 480 NETIF_F_TSO | 481 NETIF_F_HW_CSUM | 482 NETIF_F_HW_VLAN_CTAG_TX | 483 NETIF_F_HW_VLAN_CTAG_RX; 484 netdev->features = netdev->hw_features | 485 NETIF_F_HW_VLAN_CTAG_FILTER; 486 netdev->hw_features |= NETIF_F_RXCSUM; 487 488 if (pci_using_dac) { 489 netdev->features |= NETIF_F_HIGHDMA; 490 netdev->vlan_features |= NETIF_F_HIGHDMA; 491 } 492 493 /* make sure the EEPROM is good */ 494 495 if (!ixgb_validate_eeprom_checksum(&adapter->hw)) { 496 netif_err(adapter, probe, adapter->netdev, 497 "The EEPROM Checksum Is Not Valid\n"); 498 err = -EIO; 499 goto err_eeprom; 500 } 501 502 ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr); 503 504 if (!is_valid_ether_addr(netdev->dev_addr)) { 505 netif_err(adapter, probe, adapter->netdev, "Invalid MAC Address\n"); 506 err = -EIO; 507 goto err_eeprom; 508 } 509 510 adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw); 511 512 init_timer(&adapter->watchdog_timer); 513 adapter->watchdog_timer.function = ixgb_watchdog; 514 adapter->watchdog_timer.data = (unsigned long)adapter; 515 516 INIT_WORK(&adapter->tx_timeout_task, ixgb_tx_timeout_task); 517 518 strcpy(netdev->name, "eth%d"); 519 err = register_netdev(netdev); 520 if (err) 521 goto err_register; 522 523 /* carrier off reporting is important to ethtool even BEFORE open */ 524 netif_carrier_off(netdev); 525 526 netif_info(adapter, probe, adapter->netdev, 527 "Intel(R) PRO/10GbE Network Connection\n"); 528 ixgb_check_options(adapter); 529 /* reset the hardware with the new settings */ 530 531 ixgb_reset(adapter); 532 533 cards_found++; 534 return 0; 535 536err_register: 537err_sw_init: 538err_eeprom: 539 iounmap(adapter->hw.hw_addr); 540err_ioremap: 541 free_netdev(netdev); 542err_alloc_etherdev: 543 pci_release_regions(pdev); 544err_request_regions: 545err_dma_mask: 546 pci_disable_device(pdev); 547 return err; 548} 549 550/** 551 * ixgb_remove - Device Removal Routine 552 * @pdev: PCI device information struct 553 * 554 * ixgb_remove is called by the PCI subsystem to alert the driver 555 * that it should release a PCI device. The could be caused by a 556 * Hot-Plug event, or because the driver is going to be removed from 557 * memory. 558 **/ 559 560static void 561ixgb_remove(struct pci_dev *pdev) 562{ 563 struct net_device *netdev = pci_get_drvdata(pdev); 564 struct ixgb_adapter *adapter = netdev_priv(netdev); 565 566 cancel_work_sync(&adapter->tx_timeout_task); 567 568 unregister_netdev(netdev); 569 570 iounmap(adapter->hw.hw_addr); 571 pci_release_regions(pdev); 572 573 free_netdev(netdev); 574 pci_disable_device(pdev); 575} 576 577/** 578 * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter) 579 * @adapter: board private structure to initialize 580 * 581 * ixgb_sw_init initializes the Adapter private data structure. 582 * Fields are initialized based on PCI device information and 583 * OS network device settings (MTU size). 584 **/ 585 586static int 587ixgb_sw_init(struct ixgb_adapter *adapter) 588{ 589 struct ixgb_hw *hw = &adapter->hw; 590 struct net_device *netdev = adapter->netdev; 591 struct pci_dev *pdev = adapter->pdev; 592 593 /* PCI config space info */ 594 595 hw->vendor_id = pdev->vendor; 596 hw->device_id = pdev->device; 597 hw->subsystem_vendor_id = pdev->subsystem_vendor; 598 hw->subsystem_id = pdev->subsystem_device; 599 600 hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH; 601 adapter->rx_buffer_len = hw->max_frame_size + 8; /* + 8 for errata */ 602 603 if ((hw->device_id == IXGB_DEVICE_ID_82597EX) || 604 (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4) || 605 (hw->device_id == IXGB_DEVICE_ID_82597EX_LR) || 606 (hw->device_id == IXGB_DEVICE_ID_82597EX_SR)) 607 hw->mac_type = ixgb_82597; 608 else { 609 /* should never have loaded on this device */ 610 netif_err(adapter, probe, adapter->netdev, "unsupported device id\n"); 611 } 612 613 /* enable flow control to be programmed */ 614 hw->fc.send_xon = 1; 615 616 set_bit(__IXGB_DOWN, &adapter->flags); 617 return 0; 618} 619 620/** 621 * ixgb_open - Called when a network interface is made active 622 * @netdev: network interface device structure 623 * 624 * Returns 0 on success, negative value on failure 625 * 626 * The open entry point is called when a network interface is made 627 * active by the system (IFF_UP). At this point all resources needed 628 * for transmit and receive operations are allocated, the interrupt 629 * handler is registered with the OS, the watchdog timer is started, 630 * and the stack is notified that the interface is ready. 631 **/ 632 633static int 634ixgb_open(struct net_device *netdev) 635{ 636 struct ixgb_adapter *adapter = netdev_priv(netdev); 637 int err; 638 639 /* allocate transmit descriptors */ 640 err = ixgb_setup_tx_resources(adapter); 641 if (err) 642 goto err_setup_tx; 643 644 netif_carrier_off(netdev); 645 646 /* allocate receive descriptors */ 647 648 err = ixgb_setup_rx_resources(adapter); 649 if (err) 650 goto err_setup_rx; 651 652 err = ixgb_up(adapter); 653 if (err) 654 goto err_up; 655 656 netif_start_queue(netdev); 657 658 return 0; 659 660err_up: 661 ixgb_free_rx_resources(adapter); 662err_setup_rx: 663 ixgb_free_tx_resources(adapter); 664err_setup_tx: 665 ixgb_reset(adapter); 666 667 return err; 668} 669 670/** 671 * ixgb_close - Disables a network interface 672 * @netdev: network interface device structure 673 * 674 * Returns 0, this is not allowed to fail 675 * 676 * The close entry point is called when an interface is de-activated 677 * by the OS. The hardware is still under the drivers control, but 678 * needs to be disabled. A global MAC reset is issued to stop the 679 * hardware, and all transmit and receive resources are freed. 680 **/ 681 682static int 683ixgb_close(struct net_device *netdev) 684{ 685 struct ixgb_adapter *adapter = netdev_priv(netdev); 686 687 ixgb_down(adapter, true); 688 689 ixgb_free_tx_resources(adapter); 690 ixgb_free_rx_resources(adapter); 691 692 return 0; 693} 694 695/** 696 * ixgb_setup_tx_resources - allocate Tx resources (Descriptors) 697 * @adapter: board private structure 698 * 699 * Return 0 on success, negative on failure 700 **/ 701 702int 703ixgb_setup_tx_resources(struct ixgb_adapter *adapter) 704{ 705 struct ixgb_desc_ring *txdr = &adapter->tx_ring; 706 struct pci_dev *pdev = adapter->pdev; 707 int size; 708 709 size = sizeof(struct ixgb_buffer) * txdr->count; 710 txdr->buffer_info = vzalloc(size); 711 if (!txdr->buffer_info) 712 return -ENOMEM; 713 714 /* round up to nearest 4K */ 715 716 txdr->size = txdr->count * sizeof(struct ixgb_tx_desc); 717 txdr->size = ALIGN(txdr->size, 4096); 718 719 txdr->desc = dma_alloc_coherent(&pdev->dev, txdr->size, &txdr->dma, 720 GFP_KERNEL | __GFP_ZERO); 721 if (!txdr->desc) { 722 vfree(txdr->buffer_info); 723 return -ENOMEM; 724 } 725 726 txdr->next_to_use = 0; 727 txdr->next_to_clean = 0; 728 729 return 0; 730} 731 732/** 733 * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset. 734 * @adapter: board private structure 735 * 736 * Configure the Tx unit of the MAC after a reset. 737 **/ 738 739static void 740ixgb_configure_tx(struct ixgb_adapter *adapter) 741{ 742 u64 tdba = adapter->tx_ring.dma; 743 u32 tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc); 744 u32 tctl; 745 struct ixgb_hw *hw = &adapter->hw; 746 747 /* Setup the Base and Length of the Tx Descriptor Ring 748 * tx_ring.dma can be either a 32 or 64 bit value 749 */ 750 751 IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL)); 752 IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32)); 753 754 IXGB_WRITE_REG(hw, TDLEN, tdlen); 755 756 /* Setup the HW Tx Head and Tail descriptor pointers */ 757 758 IXGB_WRITE_REG(hw, TDH, 0); 759 IXGB_WRITE_REG(hw, TDT, 0); 760 761 /* don't set up txdctl, it induces performance problems if configured 762 * incorrectly */ 763 /* Set the Tx Interrupt Delay register */ 764 765 IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay); 766 767 /* Program the Transmit Control Register */ 768 769 tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE; 770 IXGB_WRITE_REG(hw, TCTL, tctl); 771 772 /* Setup Transmit Descriptor Settings for this adapter */ 773 adapter->tx_cmd_type = 774 IXGB_TX_DESC_TYPE | 775 (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0); 776} 777 778/** 779 * ixgb_setup_rx_resources - allocate Rx resources (Descriptors) 780 * @adapter: board private structure 781 * 782 * Returns 0 on success, negative on failure 783 **/ 784 785int 786ixgb_setup_rx_resources(struct ixgb_adapter *adapter) 787{ 788 struct ixgb_desc_ring *rxdr = &adapter->rx_ring; 789 struct pci_dev *pdev = adapter->pdev; 790 int size; 791 792 size = sizeof(struct ixgb_buffer) * rxdr->count; 793 rxdr->buffer_info = vzalloc(size); 794 if (!rxdr->buffer_info) 795 return -ENOMEM; 796 797 /* Round up to nearest 4K */ 798 799 rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc); 800 rxdr->size = ALIGN(rxdr->size, 4096); 801 802 rxdr->desc = dma_alloc_coherent(&pdev->dev, rxdr->size, &rxdr->dma, 803 GFP_KERNEL); 804 805 if (!rxdr->desc) { 806 vfree(rxdr->buffer_info); 807 return -ENOMEM; 808 } 809 memset(rxdr->desc, 0, rxdr->size); 810 811 rxdr->next_to_clean = 0; 812 rxdr->next_to_use = 0; 813 814 return 0; 815} 816 817/** 818 * ixgb_setup_rctl - configure the receive control register 819 * @adapter: Board private structure 820 **/ 821 822static void 823ixgb_setup_rctl(struct ixgb_adapter *adapter) 824{ 825 u32 rctl; 826 827 rctl = IXGB_READ_REG(&adapter->hw, RCTL); 828 829 rctl &= ~(3 << IXGB_RCTL_MO_SHIFT); 830 831 rctl |= 832 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 | 833 IXGB_RCTL_RXEN | IXGB_RCTL_CFF | 834 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT); 835 836 rctl |= IXGB_RCTL_SECRC; 837 838 if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048) 839 rctl |= IXGB_RCTL_BSIZE_2048; 840 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096) 841 rctl |= IXGB_RCTL_BSIZE_4096; 842 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192) 843 rctl |= IXGB_RCTL_BSIZE_8192; 844 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384) 845 rctl |= IXGB_RCTL_BSIZE_16384; 846 847 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl); 848} 849 850/** 851 * ixgb_configure_rx - Configure 82597 Receive Unit after Reset. 852 * @adapter: board private structure 853 * 854 * Configure the Rx unit of the MAC after a reset. 855 **/ 856 857static void 858ixgb_configure_rx(struct ixgb_adapter *adapter) 859{ 860 u64 rdba = adapter->rx_ring.dma; 861 u32 rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc); 862 struct ixgb_hw *hw = &adapter->hw; 863 u32 rctl; 864 u32 rxcsum; 865 866 /* make sure receives are disabled while setting up the descriptors */ 867 868 rctl = IXGB_READ_REG(hw, RCTL); 869 IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN); 870 871 /* set the Receive Delay Timer Register */ 872 873 IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay); 874 875 /* Setup the Base and Length of the Rx Descriptor Ring */ 876 877 IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL)); 878 IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32)); 879 880 IXGB_WRITE_REG(hw, RDLEN, rdlen); 881 882 /* Setup the HW Rx Head and Tail Descriptor Pointers */ 883 IXGB_WRITE_REG(hw, RDH, 0); 884 IXGB_WRITE_REG(hw, RDT, 0); 885 886 /* due to the hardware errata with RXDCTL, we are unable to use any of 887 * the performance enhancing features of it without causing other 888 * subtle bugs, some of the bugs could include receive length 889 * corruption at high data rates (WTHRESH > 0) and/or receive 890 * descriptor ring irregularites (particularly in hardware cache) */ 891 IXGB_WRITE_REG(hw, RXDCTL, 0); 892 893 /* Enable Receive Checksum Offload for TCP and UDP */ 894 if (adapter->rx_csum) { 895 rxcsum = IXGB_READ_REG(hw, RXCSUM); 896 rxcsum |= IXGB_RXCSUM_TUOFL; 897 IXGB_WRITE_REG(hw, RXCSUM, rxcsum); 898 } 899 900 /* Enable Receives */ 901 902 IXGB_WRITE_REG(hw, RCTL, rctl); 903} 904 905/** 906 * ixgb_free_tx_resources - Free Tx Resources 907 * @adapter: board private structure 908 * 909 * Free all transmit software resources 910 **/ 911 912void 913ixgb_free_tx_resources(struct ixgb_adapter *adapter) 914{ 915 struct pci_dev *pdev = adapter->pdev; 916 917 ixgb_clean_tx_ring(adapter); 918 919 vfree(adapter->tx_ring.buffer_info); 920 adapter->tx_ring.buffer_info = NULL; 921 922 dma_free_coherent(&pdev->dev, adapter->tx_ring.size, 923 adapter->tx_ring.desc, adapter->tx_ring.dma); 924 925 adapter->tx_ring.desc = NULL; 926} 927 928static void 929ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter, 930 struct ixgb_buffer *buffer_info) 931{ 932 if (buffer_info->dma) { 933 if (buffer_info->mapped_as_page) 934 dma_unmap_page(&adapter->pdev->dev, buffer_info->dma, 935 buffer_info->length, DMA_TO_DEVICE); 936 else 937 dma_unmap_single(&adapter->pdev->dev, buffer_info->dma, 938 buffer_info->length, DMA_TO_DEVICE); 939 buffer_info->dma = 0; 940 } 941 942 if (buffer_info->skb) { 943 dev_kfree_skb_any(buffer_info->skb); 944 buffer_info->skb = NULL; 945 } 946 buffer_info->time_stamp = 0; 947 /* these fields must always be initialized in tx 948 * buffer_info->length = 0; 949 * buffer_info->next_to_watch = 0; */ 950} 951 952/** 953 * ixgb_clean_tx_ring - Free Tx Buffers 954 * @adapter: board private structure 955 **/ 956 957static void 958ixgb_clean_tx_ring(struct ixgb_adapter *adapter) 959{ 960 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring; 961 struct ixgb_buffer *buffer_info; 962 unsigned long size; 963 unsigned int i; 964 965 /* Free all the Tx ring sk_buffs */ 966 967 for (i = 0; i < tx_ring->count; i++) { 968 buffer_info = &tx_ring->buffer_info[i]; 969 ixgb_unmap_and_free_tx_resource(adapter, buffer_info); 970 } 971 972 size = sizeof(struct ixgb_buffer) * tx_ring->count; 973 memset(tx_ring->buffer_info, 0, size); 974 975 /* Zero out the descriptor ring */ 976 977 memset(tx_ring->desc, 0, tx_ring->size); 978 979 tx_ring->next_to_use = 0; 980 tx_ring->next_to_clean = 0; 981 982 IXGB_WRITE_REG(&adapter->hw, TDH, 0); 983 IXGB_WRITE_REG(&adapter->hw, TDT, 0); 984} 985 986/** 987 * ixgb_free_rx_resources - Free Rx Resources 988 * @adapter: board private structure 989 * 990 * Free all receive software resources 991 **/ 992 993void 994ixgb_free_rx_resources(struct ixgb_adapter *adapter) 995{ 996 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring; 997 struct pci_dev *pdev = adapter->pdev; 998 999 ixgb_clean_rx_ring(adapter); 1000 1001 vfree(rx_ring->buffer_info); 1002 rx_ring->buffer_info = NULL; 1003 1004 dma_free_coherent(&pdev->dev, rx_ring->size, rx_ring->desc, 1005 rx_ring->dma); 1006 1007 rx_ring->desc = NULL; 1008} 1009 1010/** 1011 * ixgb_clean_rx_ring - Free Rx Buffers 1012 * @adapter: board private structure 1013 **/ 1014 1015static void 1016ixgb_clean_rx_ring(struct ixgb_adapter *adapter) 1017{ 1018 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring; 1019 struct ixgb_buffer *buffer_info; 1020 struct pci_dev *pdev = adapter->pdev; 1021 unsigned long size; 1022 unsigned int i; 1023 1024 /* Free all the Rx ring sk_buffs */ 1025 1026 for (i = 0; i < rx_ring->count; i++) { 1027 buffer_info = &rx_ring->buffer_info[i]; 1028 if (buffer_info->dma) { 1029 dma_unmap_single(&pdev->dev, 1030 buffer_info->dma, 1031 buffer_info->length, 1032 DMA_FROM_DEVICE); 1033 buffer_info->dma = 0; 1034 buffer_info->length = 0; 1035 } 1036 1037 if (buffer_info->skb) { 1038 dev_kfree_skb(buffer_info->skb); 1039 buffer_info->skb = NULL; 1040 } 1041 } 1042 1043 size = sizeof(struct ixgb_buffer) * rx_ring->count; 1044 memset(rx_ring->buffer_info, 0, size); 1045 1046 /* Zero out the descriptor ring */ 1047 1048 memset(rx_ring->desc, 0, rx_ring->size); 1049 1050 rx_ring->next_to_clean = 0; 1051 rx_ring->next_to_use = 0; 1052 1053 IXGB_WRITE_REG(&adapter->hw, RDH, 0); 1054 IXGB_WRITE_REG(&adapter->hw, RDT, 0); 1055} 1056 1057/** 1058 * ixgb_set_mac - Change the Ethernet Address of the NIC 1059 * @netdev: network interface device structure 1060 * @p: pointer to an address structure 1061 * 1062 * Returns 0 on success, negative on failure 1063 **/ 1064 1065static int 1066ixgb_set_mac(struct net_device *netdev, void *p) 1067{ 1068 struct ixgb_adapter *adapter = netdev_priv(netdev); 1069 struct sockaddr *addr = p; 1070 1071 if (!is_valid_ether_addr(addr->sa_data)) 1072 return -EADDRNOTAVAIL; 1073 1074 memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len); 1075 1076 ixgb_rar_set(&adapter->hw, addr->sa_data, 0); 1077 1078 return 0; 1079} 1080 1081/** 1082 * ixgb_set_multi - Multicast and Promiscuous mode set 1083 * @netdev: network interface device structure 1084 * 1085 * The set_multi entry point is called whenever the multicast address 1086 * list or the network interface flags are updated. This routine is 1087 * responsible for configuring the hardware for proper multicast, 1088 * promiscuous mode, and all-multi behavior. 1089 **/ 1090 1091static void 1092ixgb_set_multi(struct net_device *netdev) 1093{ 1094 struct ixgb_adapter *adapter = netdev_priv(netdev); 1095 struct ixgb_hw *hw = &adapter->hw; 1096 struct netdev_hw_addr *ha; 1097 u32 rctl; 1098 1099 /* Check for Promiscuous and All Multicast modes */ 1100 1101 rctl = IXGB_READ_REG(hw, RCTL); 1102 1103 if (netdev->flags & IFF_PROMISC) { 1104 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE); 1105 /* disable VLAN filtering */ 1106 rctl &= ~IXGB_RCTL_CFIEN; 1107 rctl &= ~IXGB_RCTL_VFE; 1108 } else { 1109 if (netdev->flags & IFF_ALLMULTI) { 1110 rctl |= IXGB_RCTL_MPE; 1111 rctl &= ~IXGB_RCTL_UPE; 1112 } else { 1113 rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE); 1114 } 1115 /* enable VLAN filtering */ 1116 rctl |= IXGB_RCTL_VFE; 1117 rctl &= ~IXGB_RCTL_CFIEN; 1118 } 1119 1120 if (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES) { 1121 rctl |= IXGB_RCTL_MPE; 1122 IXGB_WRITE_REG(hw, RCTL, rctl); 1123 } else { 1124 u8 *mta = kmalloc(IXGB_MAX_NUM_MULTICAST_ADDRESSES * 1125 ETH_ALEN, GFP_ATOMIC); 1126 u8 *addr; 1127 if (!mta) 1128 goto alloc_failed; 1129 1130 IXGB_WRITE_REG(hw, RCTL, rctl); 1131 1132 addr = mta; 1133 netdev_for_each_mc_addr(ha, netdev) { 1134 memcpy(addr, ha->addr, ETH_ALEN); 1135 addr += ETH_ALEN; 1136 } 1137 1138 ixgb_mc_addr_list_update(hw, mta, netdev_mc_count(netdev), 0); 1139 kfree(mta); 1140 } 1141 1142alloc_failed: 1143 if (netdev->features & NETIF_F_HW_VLAN_CTAG_RX) 1144 ixgb_vlan_strip_enable(adapter); 1145 else 1146 ixgb_vlan_strip_disable(adapter); 1147 1148} 1149 1150/** 1151 * ixgb_watchdog - Timer Call-back 1152 * @data: pointer to netdev cast into an unsigned long 1153 **/ 1154 1155static void 1156ixgb_watchdog(unsigned long data) 1157{ 1158 struct ixgb_adapter *adapter = (struct ixgb_adapter *)data; 1159 struct net_device *netdev = adapter->netdev; 1160 struct ixgb_desc_ring *txdr = &adapter->tx_ring; 1161 1162 ixgb_check_for_link(&adapter->hw); 1163 1164 if (ixgb_check_for_bad_link(&adapter->hw)) { 1165 /* force the reset path */ 1166 netif_stop_queue(netdev); 1167 } 1168 1169 if (adapter->hw.link_up) { 1170 if (!netif_carrier_ok(netdev)) { 1171 netdev_info(netdev, 1172 "NIC Link is Up 10 Gbps Full Duplex, Flow Control: %s\n", 1173 (adapter->hw.fc.type == ixgb_fc_full) ? 1174 "RX/TX" : 1175 (adapter->hw.fc.type == ixgb_fc_rx_pause) ? 1176 "RX" : 1177 (adapter->hw.fc.type == ixgb_fc_tx_pause) ? 1178 "TX" : "None"); 1179 adapter->link_speed = 10000; 1180 adapter->link_duplex = FULL_DUPLEX; 1181 netif_carrier_on(netdev); 1182 } 1183 } else { 1184 if (netif_carrier_ok(netdev)) { 1185 adapter->link_speed = 0; 1186 adapter->link_duplex = 0; 1187 netdev_info(netdev, "NIC Link is Down\n"); 1188 netif_carrier_off(netdev); 1189 } 1190 } 1191 1192 ixgb_update_stats(adapter); 1193 1194 if (!netif_carrier_ok(netdev)) { 1195 if (IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) { 1196 /* We've lost link, so the controller stops DMA, 1197 * but we've got queued Tx work that's never going 1198 * to get done, so reset controller to flush Tx. 1199 * (Do the reset outside of interrupt context). */ 1200 schedule_work(&adapter->tx_timeout_task); 1201 /* return immediately since reset is imminent */ 1202 return; 1203 } 1204 } 1205 1206 /* Force detection of hung controller every watchdog period */ 1207 adapter->detect_tx_hung = true; 1208 1209 /* generate an interrupt to force clean up of any stragglers */ 1210 IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW); 1211 1212 /* Reset the timer */ 1213 mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ); 1214} 1215 1216#define IXGB_TX_FLAGS_CSUM 0x00000001 1217#define IXGB_TX_FLAGS_VLAN 0x00000002 1218#define IXGB_TX_FLAGS_TSO 0x00000004 1219 1220static int 1221ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb) 1222{ 1223 struct ixgb_context_desc *context_desc; 1224 unsigned int i; 1225 u8 ipcss, ipcso, tucss, tucso, hdr_len; 1226 u16 ipcse, tucse, mss; 1227 int err; 1228 1229 if (likely(skb_is_gso(skb))) { 1230 struct ixgb_buffer *buffer_info; 1231 struct iphdr *iph; 1232 1233 if (skb_header_cloned(skb)) { 1234 err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC); 1235 if (err) 1236 return err; 1237 } 1238 1239 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb); 1240 mss = skb_shinfo(skb)->gso_size; 1241 iph = ip_hdr(skb); 1242 iph->tot_len = 0; 1243 iph->check = 0; 1244 tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr, 1245 iph->daddr, 0, 1246 IPPROTO_TCP, 0); 1247 ipcss = skb_network_offset(skb); 1248 ipcso = (void *)&(iph->check) - (void *)skb->data; 1249 ipcse = skb_transport_offset(skb) - 1; 1250 tucss = skb_transport_offset(skb); 1251 tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data; 1252 tucse = 0; 1253 1254 i = adapter->tx_ring.next_to_use; 1255 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i); 1256 buffer_info = &adapter->tx_ring.buffer_info[i]; 1257 WARN_ON(buffer_info->dma != 0); 1258 1259 context_desc->ipcss = ipcss; 1260 context_desc->ipcso = ipcso; 1261 context_desc->ipcse = cpu_to_le16(ipcse); 1262 context_desc->tucss = tucss; 1263 context_desc->tucso = tucso; 1264 context_desc->tucse = cpu_to_le16(tucse); 1265 context_desc->mss = cpu_to_le16(mss); 1266 context_desc->hdr_len = hdr_len; 1267 context_desc->status = 0; 1268 context_desc->cmd_type_len = cpu_to_le32( 1269 IXGB_CONTEXT_DESC_TYPE 1270 | IXGB_CONTEXT_DESC_CMD_TSE 1271 | IXGB_CONTEXT_DESC_CMD_IP 1272 | IXGB_CONTEXT_DESC_CMD_TCP 1273 | IXGB_CONTEXT_DESC_CMD_IDE 1274 | (skb->len - (hdr_len))); 1275 1276 1277 if (++i == adapter->tx_ring.count) i = 0; 1278 adapter->tx_ring.next_to_use = i; 1279 1280 return 1; 1281 } 1282 1283 return 0; 1284} 1285 1286static bool 1287ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb) 1288{ 1289 struct ixgb_context_desc *context_desc; 1290 unsigned int i; 1291 u8 css, cso; 1292 1293 if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) { 1294 struct ixgb_buffer *buffer_info; 1295 css = skb_checksum_start_offset(skb); 1296 cso = css + skb->csum_offset; 1297 1298 i = adapter->tx_ring.next_to_use; 1299 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i); 1300 buffer_info = &adapter->tx_ring.buffer_info[i]; 1301 WARN_ON(buffer_info->dma != 0); 1302 1303 context_desc->tucss = css; 1304 context_desc->tucso = cso; 1305 context_desc->tucse = 0; 1306 /* zero out any previously existing data in one instruction */ 1307 *(u32 *)&(context_desc->ipcss) = 0; 1308 context_desc->status = 0; 1309 context_desc->hdr_len = 0; 1310 context_desc->mss = 0; 1311 context_desc->cmd_type_len = 1312 cpu_to_le32(IXGB_CONTEXT_DESC_TYPE 1313 | IXGB_TX_DESC_CMD_IDE); 1314 1315 if (++i == adapter->tx_ring.count) i = 0; 1316 adapter->tx_ring.next_to_use = i; 1317 1318 return true; 1319 } 1320 1321 return false; 1322} 1323 1324#define IXGB_MAX_TXD_PWR 14 1325#define IXGB_MAX_DATA_PER_TXD (1<<IXGB_MAX_TXD_PWR) 1326 1327static int 1328ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb, 1329 unsigned int first) 1330{ 1331 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring; 1332 struct pci_dev *pdev = adapter->pdev; 1333 struct ixgb_buffer *buffer_info; 1334 int len = skb_headlen(skb); 1335 unsigned int offset = 0, size, count = 0, i; 1336 unsigned int mss = skb_shinfo(skb)->gso_size; 1337 unsigned int nr_frags = skb_shinfo(skb)->nr_frags; 1338 unsigned int f; 1339 1340 i = tx_ring->next_to_use; 1341 1342 while (len) { 1343 buffer_info = &tx_ring->buffer_info[i]; 1344 size = min(len, IXGB_MAX_DATA_PER_TXD); 1345 /* Workaround for premature desc write-backs 1346 * in TSO mode. Append 4-byte sentinel desc */ 1347 if (unlikely(mss && !nr_frags && size == len && size > 8)) 1348 size -= 4; 1349 1350 buffer_info->length = size; 1351 WARN_ON(buffer_info->dma != 0); 1352 buffer_info->time_stamp = jiffies; 1353 buffer_info->mapped_as_page = false; 1354 buffer_info->dma = dma_map_single(&pdev->dev, 1355 skb->data + offset, 1356 size, DMA_TO_DEVICE); 1357 if (dma_mapping_error(&pdev->dev, buffer_info->dma)) 1358 goto dma_error; 1359 buffer_info->next_to_watch = 0; 1360 1361 len -= size; 1362 offset += size; 1363 count++; 1364 if (len) { 1365 i++; 1366 if (i == tx_ring->count) 1367 i = 0; 1368 } 1369 } 1370 1371 for (f = 0; f < nr_frags; f++) { 1372 const struct skb_frag_struct *frag; 1373 1374 frag = &skb_shinfo(skb)->frags[f]; 1375 len = skb_frag_size(frag); 1376 offset = 0; 1377 1378 while (len) { 1379 i++; 1380 if (i == tx_ring->count) 1381 i = 0; 1382 1383 buffer_info = &tx_ring->buffer_info[i]; 1384 size = min(len, IXGB_MAX_DATA_PER_TXD); 1385 1386 /* Workaround for premature desc write-backs 1387 * in TSO mode. Append 4-byte sentinel desc */ 1388 if (unlikely(mss && (f == (nr_frags - 1)) 1389 && size == len && size > 8)) 1390 size -= 4; 1391 1392 buffer_info->length = size; 1393 buffer_info->time_stamp = jiffies; 1394 buffer_info->mapped_as_page = true; 1395 buffer_info->dma = 1396 skb_frag_dma_map(&pdev->dev, frag, offset, size, 1397 DMA_TO_DEVICE); 1398 if (dma_mapping_error(&pdev->dev, buffer_info->dma)) 1399 goto dma_error; 1400 buffer_info->next_to_watch = 0; 1401 1402 len -= size; 1403 offset += size; 1404 count++; 1405 } 1406 } 1407 tx_ring->buffer_info[i].skb = skb; 1408 tx_ring->buffer_info[first].next_to_watch = i; 1409 1410 return count; 1411 1412dma_error: 1413 dev_err(&pdev->dev, "TX DMA map failed\n"); 1414 buffer_info->dma = 0; 1415 if (count) 1416 count--; 1417 1418 while (count--) { 1419 if (i==0) 1420 i += tx_ring->count; 1421 i--; 1422 buffer_info = &tx_ring->buffer_info[i]; 1423 ixgb_unmap_and_free_tx_resource(adapter, buffer_info); 1424 } 1425 1426 return 0; 1427} 1428 1429static void 1430ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags) 1431{ 1432 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring; 1433 struct ixgb_tx_desc *tx_desc = NULL; 1434 struct ixgb_buffer *buffer_info; 1435 u32 cmd_type_len = adapter->tx_cmd_type; 1436 u8 status = 0; 1437 u8 popts = 0; 1438 unsigned int i; 1439 1440 if (tx_flags & IXGB_TX_FLAGS_TSO) { 1441 cmd_type_len |= IXGB_TX_DESC_CMD_TSE; 1442 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM); 1443 } 1444 1445 if (tx_flags & IXGB_TX_FLAGS_CSUM) 1446 popts |= IXGB_TX_DESC_POPTS_TXSM; 1447 1448 if (tx_flags & IXGB_TX_FLAGS_VLAN) 1449 cmd_type_len |= IXGB_TX_DESC_CMD_VLE; 1450 1451 i = tx_ring->next_to_use; 1452 1453 while (count--) { 1454 buffer_info = &tx_ring->buffer_info[i]; 1455 tx_desc = IXGB_TX_DESC(*tx_ring, i); 1456 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma); 1457 tx_desc->cmd_type_len = 1458 cpu_to_le32(cmd_type_len | buffer_info->length); 1459 tx_desc->status = status; 1460 tx_desc->popts = popts; 1461 tx_desc->vlan = cpu_to_le16(vlan_id); 1462 1463 if (++i == tx_ring->count) i = 0; 1464 } 1465 1466 tx_desc->cmd_type_len |= 1467 cpu_to_le32(IXGB_TX_DESC_CMD_EOP | IXGB_TX_DESC_CMD_RS); 1468 1469 /* Force memory writes to complete before letting h/w 1470 * know there are new descriptors to fetch. (Only 1471 * applicable for weak-ordered memory model archs, 1472 * such as IA-64). */ 1473 wmb(); 1474 1475 tx_ring->next_to_use = i; 1476 IXGB_WRITE_REG(&adapter->hw, TDT, i); 1477} 1478 1479static int __ixgb_maybe_stop_tx(struct net_device *netdev, int size) 1480{ 1481 struct ixgb_adapter *adapter = netdev_priv(netdev); 1482 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring; 1483 1484 netif_stop_queue(netdev); 1485 /* Herbert's original patch had: 1486 * smp_mb__after_netif_stop_queue(); 1487 * but since that doesn't exist yet, just open code it. */ 1488 smp_mb(); 1489 1490 /* We need to check again in a case another CPU has just 1491 * made room available. */ 1492 if (likely(IXGB_DESC_UNUSED(tx_ring) < size)) 1493 return -EBUSY; 1494 1495 /* A reprieve! */ 1496 netif_start_queue(netdev); 1497 ++adapter->restart_queue; 1498 return 0; 1499} 1500 1501static int ixgb_maybe_stop_tx(struct net_device *netdev, 1502 struct ixgb_desc_ring *tx_ring, int size) 1503{ 1504 if (likely(IXGB_DESC_UNUSED(tx_ring) >= size)) 1505 return 0; 1506 return __ixgb_maybe_stop_tx(netdev, size); 1507} 1508 1509 1510/* Tx Descriptors needed, worst case */ 1511#define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \ 1512 (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0)) 1513#define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) /* skb->date */ + \ 1514 MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 /* for context */ \ 1515 + 1 /* one more needed for sentinel TSO workaround */ 1516 1517static netdev_tx_t 1518ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev) 1519{ 1520 struct ixgb_adapter *adapter = netdev_priv(netdev); 1521 unsigned int first; 1522 unsigned int tx_flags = 0; 1523 int vlan_id = 0; 1524 int count = 0; 1525 int tso; 1526 1527 if (test_bit(__IXGB_DOWN, &adapter->flags)) { 1528 dev_kfree_skb(skb); 1529 return NETDEV_TX_OK; 1530 } 1531 1532 if (skb->len <= 0) { 1533 dev_kfree_skb(skb); 1534 return NETDEV_TX_OK; 1535 } 1536 1537 if (unlikely(ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, 1538 DESC_NEEDED))) 1539 return NETDEV_TX_BUSY; 1540 1541 if (vlan_tx_tag_present(skb)) { 1542 tx_flags |= IXGB_TX_FLAGS_VLAN; 1543 vlan_id = vlan_tx_tag_get(skb); 1544 } 1545 1546 first = adapter->tx_ring.next_to_use; 1547 1548 tso = ixgb_tso(adapter, skb); 1549 if (tso < 0) { 1550 dev_kfree_skb(skb); 1551 return NETDEV_TX_OK; 1552 } 1553 1554 if (likely(tso)) 1555 tx_flags |= IXGB_TX_FLAGS_TSO; 1556 else if (ixgb_tx_csum(adapter, skb)) 1557 tx_flags |= IXGB_TX_FLAGS_CSUM; 1558 1559 count = ixgb_tx_map(adapter, skb, first); 1560 1561 if (count) { 1562 ixgb_tx_queue(adapter, count, vlan_id, tx_flags); 1563 /* Make sure there is space in the ring for the next send. */ 1564 ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED); 1565 1566 } else { 1567 dev_kfree_skb_any(skb); 1568 adapter->tx_ring.buffer_info[first].time_stamp = 0; 1569 adapter->tx_ring.next_to_use = first; 1570 } 1571 1572 return NETDEV_TX_OK; 1573} 1574 1575/** 1576 * ixgb_tx_timeout - Respond to a Tx Hang 1577 * @netdev: network interface device structure 1578 **/ 1579 1580static void 1581ixgb_tx_timeout(struct net_device *netdev) 1582{ 1583 struct ixgb_adapter *adapter = netdev_priv(netdev); 1584 1585 /* Do the reset outside of interrupt context */ 1586 schedule_work(&adapter->tx_timeout_task); 1587} 1588 1589static void 1590ixgb_tx_timeout_task(struct work_struct *work) 1591{ 1592 struct ixgb_adapter *adapter = 1593 container_of(work, struct ixgb_adapter, tx_timeout_task); 1594 1595 adapter->tx_timeout_count++; 1596 ixgb_down(adapter, true); 1597 ixgb_up(adapter); 1598} 1599 1600/** 1601 * ixgb_get_stats - Get System Network Statistics 1602 * @netdev: network interface device structure 1603 * 1604 * Returns the address of the device statistics structure. 1605 * The statistics are actually updated from the timer callback. 1606 **/ 1607 1608static struct net_device_stats * 1609ixgb_get_stats(struct net_device *netdev) 1610{ 1611 return &netdev->stats; 1612} 1613 1614/** 1615 * ixgb_change_mtu - Change the Maximum Transfer Unit 1616 * @netdev: network interface device structure 1617 * @new_mtu: new value for maximum frame size 1618 * 1619 * Returns 0 on success, negative on failure 1620 **/ 1621 1622static int 1623ixgb_change_mtu(struct net_device *netdev, int new_mtu) 1624{ 1625 struct ixgb_adapter *adapter = netdev_priv(netdev); 1626 int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH; 1627 int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH; 1628 1629 /* MTU < 68 is an error for IPv4 traffic, just don't allow it */ 1630 if ((new_mtu < 68) || 1631 (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) { 1632 netif_err(adapter, probe, adapter->netdev, 1633 "Invalid MTU setting %d\n", new_mtu); 1634 return -EINVAL; 1635 } 1636 1637 if (old_max_frame == max_frame) 1638 return 0; 1639 1640 if (netif_running(netdev)) 1641 ixgb_down(adapter, true); 1642 1643 adapter->rx_buffer_len = max_frame + 8; /* + 8 for errata */ 1644 1645 netdev->mtu = new_mtu; 1646 1647 if (netif_running(netdev)) 1648 ixgb_up(adapter); 1649 1650 return 0; 1651} 1652 1653/** 1654 * ixgb_update_stats - Update the board statistics counters. 1655 * @adapter: board private structure 1656 **/ 1657 1658void 1659ixgb_update_stats(struct ixgb_adapter *adapter) 1660{ 1661 struct net_device *netdev = adapter->netdev; 1662 struct pci_dev *pdev = adapter->pdev; 1663 1664 /* Prevent stats update while adapter is being reset */ 1665 if (pci_channel_offline(pdev)) 1666 return; 1667 1668 if ((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) || 1669 (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) { 1670 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL); 1671 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL); 1672 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH); 1673 u64 bcast = ((u64)bcast_h << 32) | bcast_l; 1674 1675 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32); 1676 /* fix up multicast stats by removing broadcasts */ 1677 if (multi >= bcast) 1678 multi -= bcast; 1679 1680 adapter->stats.mprcl += (multi & 0xFFFFFFFF); 1681 adapter->stats.mprch += (multi >> 32); 1682 adapter->stats.bprcl += bcast_l; 1683 adapter->stats.bprch += bcast_h; 1684 } else { 1685 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL); 1686 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH); 1687 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL); 1688 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH); 1689 } 1690 adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL); 1691 adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH); 1692 adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL); 1693 adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH); 1694 adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL); 1695 adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH); 1696 adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL); 1697 adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH); 1698 adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL); 1699 adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH); 1700 adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL); 1701 adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH); 1702 adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL); 1703 adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH); 1704 adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC); 1705 adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC); 1706 adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC); 1707 adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC); 1708 adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS); 1709 adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC); 1710 adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC); 1711 adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC); 1712 adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL); 1713 adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH); 1714 adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL); 1715 adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH); 1716 adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL); 1717 adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH); 1718 adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL); 1719 adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH); 1720 adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL); 1721 adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH); 1722 adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL); 1723 adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH); 1724 adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL); 1725 adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH); 1726 adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL); 1727 adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH); 1728 adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL); 1729 adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH); 1730 adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC); 1731 adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C); 1732 adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC); 1733 adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC); 1734 adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC); 1735 adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC); 1736 adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC); 1737 adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC); 1738 adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC); 1739 adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC); 1740 adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC); 1741 adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC); 1742 adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC); 1743 adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC); 1744 adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC); 1745 adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC); 1746 1747 /* Fill out the OS statistics structure */ 1748 1749 netdev->stats.rx_packets = adapter->stats.gprcl; 1750 netdev->stats.tx_packets = adapter->stats.gptcl; 1751 netdev->stats.rx_bytes = adapter->stats.gorcl; 1752 netdev->stats.tx_bytes = adapter->stats.gotcl; 1753 netdev->stats.multicast = adapter->stats.mprcl; 1754 netdev->stats.collisions = 0; 1755 1756 /* ignore RLEC as it reports errors for padded (<64bytes) frames 1757 * with a length in the type/len field */ 1758 netdev->stats.rx_errors = 1759 /* adapter->stats.rnbc + */ adapter->stats.crcerrs + 1760 adapter->stats.ruc + 1761 adapter->stats.roc /*+ adapter->stats.rlec */ + 1762 adapter->stats.icbc + 1763 adapter->stats.ecbc + adapter->stats.mpc; 1764 1765 /* see above 1766 * netdev->stats.rx_length_errors = adapter->stats.rlec; 1767 */ 1768 1769 netdev->stats.rx_crc_errors = adapter->stats.crcerrs; 1770 netdev->stats.rx_fifo_errors = adapter->stats.mpc; 1771 netdev->stats.rx_missed_errors = adapter->stats.mpc; 1772 netdev->stats.rx_over_errors = adapter->stats.mpc; 1773 1774 netdev->stats.tx_errors = 0; 1775 netdev->stats.rx_frame_errors = 0; 1776 netdev->stats.tx_aborted_errors = 0; 1777 netdev->stats.tx_carrier_errors = 0; 1778 netdev->stats.tx_fifo_errors = 0; 1779 netdev->stats.tx_heartbeat_errors = 0; 1780 netdev->stats.tx_window_errors = 0; 1781} 1782 1783#define IXGB_MAX_INTR 10 1784/** 1785 * ixgb_intr - Interrupt Handler 1786 * @irq: interrupt number 1787 * @data: pointer to a network interface device structure 1788 **/ 1789 1790static irqreturn_t 1791ixgb_intr(int irq, void *data) 1792{ 1793 struct net_device *netdev = data; 1794 struct ixgb_adapter *adapter = netdev_priv(netdev); 1795 struct ixgb_hw *hw = &adapter->hw; 1796 u32 icr = IXGB_READ_REG(hw, ICR); 1797 1798 if (unlikely(!icr)) 1799 return IRQ_NONE; /* Not our interrupt */ 1800 1801 if (unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC))) 1802 if (!test_bit(__IXGB_DOWN, &adapter->flags)) 1803 mod_timer(&adapter->watchdog_timer, jiffies); 1804 1805 if (napi_schedule_prep(&adapter->napi)) { 1806 1807 /* Disable interrupts and register for poll. The flush 1808 of the posted write is intentionally left out. 1809 */ 1810 1811 IXGB_WRITE_REG(&adapter->hw, IMC, ~0); 1812 __napi_schedule(&adapter->napi); 1813 } 1814 return IRQ_HANDLED; 1815} 1816 1817/** 1818 * ixgb_clean - NAPI Rx polling callback 1819 * @adapter: board private structure 1820 **/ 1821 1822static int 1823ixgb_clean(struct napi_struct *napi, int budget) 1824{ 1825 struct ixgb_adapter *adapter = container_of(napi, struct ixgb_adapter, napi); 1826 int work_done = 0; 1827 1828 ixgb_clean_tx_irq(adapter); 1829 ixgb_clean_rx_irq(adapter, &work_done, budget); 1830 1831 /* If budget not fully consumed, exit the polling mode */ 1832 if (work_done < budget) { 1833 napi_complete(napi); 1834 if (!test_bit(__IXGB_DOWN, &adapter->flags)) 1835 ixgb_irq_enable(adapter); 1836 } 1837 1838 return work_done; 1839} 1840 1841/** 1842 * ixgb_clean_tx_irq - Reclaim resources after transmit completes 1843 * @adapter: board private structure 1844 **/ 1845 1846static bool 1847ixgb_clean_tx_irq(struct ixgb_adapter *adapter) 1848{ 1849 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring; 1850 struct net_device *netdev = adapter->netdev; 1851 struct ixgb_tx_desc *tx_desc, *eop_desc; 1852 struct ixgb_buffer *buffer_info; 1853 unsigned int i, eop; 1854 bool cleaned = false; 1855 1856 i = tx_ring->next_to_clean; 1857 eop = tx_ring->buffer_info[i].next_to_watch; 1858 eop_desc = IXGB_TX_DESC(*tx_ring, eop); 1859 1860 while (eop_desc->status & IXGB_TX_DESC_STATUS_DD) { 1861 1862 rmb(); /* read buffer_info after eop_desc */ 1863 for (cleaned = false; !cleaned; ) { 1864 tx_desc = IXGB_TX_DESC(*tx_ring, i); 1865 buffer_info = &tx_ring->buffer_info[i]; 1866 1867 if (tx_desc->popts & 1868 (IXGB_TX_DESC_POPTS_TXSM | 1869 IXGB_TX_DESC_POPTS_IXSM)) 1870 adapter->hw_csum_tx_good++; 1871 1872 ixgb_unmap_and_free_tx_resource(adapter, buffer_info); 1873 1874 *(u32 *)&(tx_desc->status) = 0; 1875 1876 cleaned = (i == eop); 1877 if (++i == tx_ring->count) i = 0; 1878 } 1879 1880 eop = tx_ring->buffer_info[i].next_to_watch; 1881 eop_desc = IXGB_TX_DESC(*tx_ring, eop); 1882 } 1883 1884 tx_ring->next_to_clean = i; 1885 1886 if (unlikely(cleaned && netif_carrier_ok(netdev) && 1887 IXGB_DESC_UNUSED(tx_ring) >= DESC_NEEDED)) { 1888 /* Make sure that anybody stopping the queue after this 1889 * sees the new next_to_clean. */ 1890 smp_mb(); 1891 1892 if (netif_queue_stopped(netdev) && 1893 !(test_bit(__IXGB_DOWN, &adapter->flags))) { 1894 netif_wake_queue(netdev); 1895 ++adapter->restart_queue; 1896 } 1897 } 1898 1899 if (adapter->detect_tx_hung) { 1900 /* detect a transmit hang in hardware, this serializes the 1901 * check with the clearing of time_stamp and movement of i */ 1902 adapter->detect_tx_hung = false; 1903 if (tx_ring->buffer_info[eop].time_stamp && 1904 time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ) 1905 && !(IXGB_READ_REG(&adapter->hw, STATUS) & 1906 IXGB_STATUS_TXOFF)) { 1907 /* detected Tx unit hang */ 1908 netif_err(adapter, drv, adapter->netdev, 1909 "Detected Tx Unit Hang\n" 1910 " TDH <%x>\n" 1911 " TDT <%x>\n" 1912 " next_to_use <%x>\n" 1913 " next_to_clean <%x>\n" 1914 "buffer_info[next_to_clean]\n" 1915 " time_stamp <%lx>\n" 1916 " next_to_watch <%x>\n" 1917 " jiffies <%lx>\n" 1918 " next_to_watch.status <%x>\n", 1919 IXGB_READ_REG(&adapter->hw, TDH), 1920 IXGB_READ_REG(&adapter->hw, TDT), 1921 tx_ring->next_to_use, 1922 tx_ring->next_to_clean, 1923 tx_ring->buffer_info[eop].time_stamp, 1924 eop, 1925 jiffies, 1926 eop_desc->status); 1927 netif_stop_queue(netdev); 1928 } 1929 } 1930 1931 return cleaned; 1932} 1933 1934/** 1935 * ixgb_rx_checksum - Receive Checksum Offload for 82597. 1936 * @adapter: board private structure 1937 * @rx_desc: receive descriptor 1938 * @sk_buff: socket buffer with received data 1939 **/ 1940 1941static void 1942ixgb_rx_checksum(struct ixgb_adapter *adapter, 1943 struct ixgb_rx_desc *rx_desc, 1944 struct sk_buff *skb) 1945{ 1946 /* Ignore Checksum bit is set OR 1947 * TCP Checksum has not been calculated 1948 */ 1949 if ((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) || 1950 (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) { 1951 skb_checksum_none_assert(skb); 1952 return; 1953 } 1954 1955 /* At this point we know the hardware did the TCP checksum */ 1956 /* now look at the TCP checksum error bit */ 1957 if (rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) { 1958 /* let the stack verify checksum errors */ 1959 skb_checksum_none_assert(skb); 1960 adapter->hw_csum_rx_error++; 1961 } else { 1962 /* TCP checksum is good */ 1963 skb->ip_summed = CHECKSUM_UNNECESSARY; 1964 adapter->hw_csum_rx_good++; 1965 } 1966} 1967 1968/* 1969 * this should improve performance for small packets with large amounts 1970 * of reassembly being done in the stack 1971 */ 1972static void ixgb_check_copybreak(struct net_device *netdev, 1973 struct ixgb_buffer *buffer_info, 1974 u32 length, struct sk_buff **skb) 1975{ 1976 struct sk_buff *new_skb; 1977 1978 if (length > copybreak) 1979 return; 1980 1981 new_skb = netdev_alloc_skb_ip_align(netdev, length); 1982 if (!new_skb) 1983 return; 1984 1985 skb_copy_to_linear_data_offset(new_skb, -NET_IP_ALIGN, 1986 (*skb)->data - NET_IP_ALIGN, 1987 length + NET_IP_ALIGN); 1988 /* save the skb in buffer_info as good */ 1989 buffer_info->skb = *skb; 1990 *skb = new_skb; 1991} 1992 1993/** 1994 * ixgb_clean_rx_irq - Send received data up the network stack, 1995 * @adapter: board private structure 1996 **/ 1997 1998static bool 1999ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do) 2000{ 2001 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring; 2002 struct net_device *netdev = adapter->netdev; 2003 struct pci_dev *pdev = adapter->pdev; 2004 struct ixgb_rx_desc *rx_desc, *next_rxd; 2005 struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer; 2006 u32 length; 2007 unsigned int i, j; 2008 int cleaned_count = 0; 2009 bool cleaned = false; 2010 2011 i = rx_ring->next_to_clean; 2012 rx_desc = IXGB_RX_DESC(*rx_ring, i); 2013 buffer_info = &rx_ring->buffer_info[i]; 2014 2015 while (rx_desc->status & IXGB_RX_DESC_STATUS_DD) { 2016 struct sk_buff *skb; 2017 u8 status; 2018 2019 if (*work_done >= work_to_do) 2020 break; 2021 2022 (*work_done)++; 2023 rmb(); /* read descriptor and rx_buffer_info after status DD */ 2024 status = rx_desc->status; 2025 skb = buffer_info->skb; 2026 buffer_info->skb = NULL; 2027 2028 prefetch(skb->data - NET_IP_ALIGN); 2029 2030 if (++i == rx_ring->count) 2031 i = 0; 2032 next_rxd = IXGB_RX_DESC(*rx_ring, i); 2033 prefetch(next_rxd); 2034 2035 j = i + 1; 2036 if (j == rx_ring->count) 2037 j = 0; 2038 next2_buffer = &rx_ring->buffer_info[j]; 2039 prefetch(next2_buffer); 2040 2041 next_buffer = &rx_ring->buffer_info[i]; 2042 2043 cleaned = true; 2044 cleaned_count++; 2045 2046 dma_unmap_single(&pdev->dev, 2047 buffer_info->dma, 2048 buffer_info->length, 2049 DMA_FROM_DEVICE); 2050 buffer_info->dma = 0; 2051 2052 length = le16_to_cpu(rx_desc->length); 2053 rx_desc->length = 0; 2054 2055 if (unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) { 2056 2057 /* All receives must fit into a single buffer */ 2058 2059 pr_debug("Receive packet consumed multiple buffers length<%x>\n", 2060 length); 2061 2062 dev_kfree_skb_irq(skb); 2063 goto rxdesc_done; 2064 } 2065 2066 if (unlikely(rx_desc->errors & 2067 (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE | 2068 IXGB_RX_DESC_ERRORS_P | IXGB_RX_DESC_ERRORS_RXE))) { 2069 dev_kfree_skb_irq(skb); 2070 goto rxdesc_done; 2071 } 2072 2073 ixgb_check_copybreak(netdev, buffer_info, length, &skb); 2074 2075 /* Good Receive */ 2076 skb_put(skb, length); 2077 2078 /* Receive Checksum Offload */ 2079 ixgb_rx_checksum(adapter, rx_desc, skb); 2080 2081 skb->protocol = eth_type_trans(skb, netdev); 2082 if (status & IXGB_RX_DESC_STATUS_VP) 2083 __vlan_hwaccel_put_tag(skb, 2084 le16_to_cpu(rx_desc->special)); 2085 2086 netif_receive_skb(skb); 2087 2088rxdesc_done: 2089 /* clean up descriptor, might be written over by hw */ 2090 rx_desc->status = 0; 2091 2092 /* return some buffers to hardware, one at a time is too slow */ 2093 if (unlikely(cleaned_count >= IXGB_RX_BUFFER_WRITE)) { 2094 ixgb_alloc_rx_buffers(adapter, cleaned_count); 2095 cleaned_count = 0; 2096 } 2097 2098 /* use prefetched values */ 2099 rx_desc = next_rxd; 2100 buffer_info = next_buffer; 2101 } 2102 2103 rx_ring->next_to_clean = i; 2104 2105 cleaned_count = IXGB_DESC_UNUSED(rx_ring); 2106 if (cleaned_count) 2107 ixgb_alloc_rx_buffers(adapter, cleaned_count); 2108 2109 return cleaned; 2110} 2111 2112/** 2113 * ixgb_alloc_rx_buffers - Replace used receive buffers 2114 * @adapter: address of board private structure 2115 **/ 2116 2117static void 2118ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter, int cleaned_count) 2119{ 2120 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring; 2121 struct net_device *netdev = adapter->netdev; 2122 struct pci_dev *pdev = adapter->pdev; 2123 struct ixgb_rx_desc *rx_desc; 2124 struct ixgb_buffer *buffer_info; 2125 struct sk_buff *skb; 2126 unsigned int i; 2127 long cleancount; 2128 2129 i = rx_ring->next_to_use; 2130 buffer_info = &rx_ring->buffer_info[i]; 2131 cleancount = IXGB_DESC_UNUSED(rx_ring); 2132 2133 2134 /* leave three descriptors unused */ 2135 while (--cleancount > 2 && cleaned_count--) { 2136 /* recycle! its good for you */ 2137 skb = buffer_info->skb; 2138 if (skb) { 2139 skb_trim(skb, 0); 2140 goto map_skb; 2141 } 2142 2143 skb = netdev_alloc_skb_ip_align(netdev, adapter->rx_buffer_len); 2144 if (unlikely(!skb)) { 2145 /* Better luck next round */ 2146 adapter->alloc_rx_buff_failed++; 2147 break; 2148 } 2149 2150 buffer_info->skb = skb; 2151 buffer_info->length = adapter->rx_buffer_len; 2152map_skb: 2153 buffer_info->dma = dma_map_single(&pdev->dev, 2154 skb->data, 2155 adapter->rx_buffer_len, 2156 DMA_FROM_DEVICE); 2157 if (dma_mapping_error(&pdev->dev, buffer_info->dma)) { 2158 adapter->alloc_rx_buff_failed++; 2159 break; 2160 } 2161 2162 rx_desc = IXGB_RX_DESC(*rx_ring, i); 2163 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma); 2164 /* guarantee DD bit not set now before h/w gets descriptor 2165 * this is the rest of the workaround for h/w double 2166 * writeback. */ 2167 rx_desc->status = 0; 2168 2169 2170 if (++i == rx_ring->count) 2171 i = 0; 2172 buffer_info = &rx_ring->buffer_info[i]; 2173 } 2174 2175 if (likely(rx_ring->next_to_use != i)) { 2176 rx_ring->next_to_use = i; 2177 if (unlikely(i-- == 0)) 2178 i = (rx_ring->count - 1); 2179 2180 /* Force memory writes to complete before letting h/w 2181 * know there are new descriptors to fetch. (Only 2182 * applicable for weak-ordered memory model archs, such 2183 * as IA-64). */ 2184 wmb(); 2185 IXGB_WRITE_REG(&adapter->hw, RDT, i); 2186 } 2187} 2188 2189static void 2190ixgb_vlan_strip_enable(struct ixgb_adapter *adapter) 2191{ 2192 u32 ctrl; 2193 2194 /* enable VLAN tag insert/strip */ 2195 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0); 2196 ctrl |= IXGB_CTRL0_VME; 2197 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl); 2198} 2199 2200static void 2201ixgb_vlan_strip_disable(struct ixgb_adapter *adapter) 2202{ 2203 u32 ctrl; 2204 2205 /* disable VLAN tag insert/strip */ 2206 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0); 2207 ctrl &= ~IXGB_CTRL0_VME; 2208 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl); 2209} 2210 2211static int 2212ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid) 2213{ 2214 struct ixgb_adapter *adapter = netdev_priv(netdev); 2215 u32 vfta, index; 2216 2217 /* add VID to filter table */ 2218 2219 index = (vid >> 5) & 0x7F; 2220 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index); 2221 vfta |= (1 << (vid & 0x1F)); 2222 ixgb_write_vfta(&adapter->hw, index, vfta); 2223 set_bit(vid, adapter->active_vlans); 2224 2225 return 0; 2226} 2227 2228static int 2229ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid) 2230{ 2231 struct ixgb_adapter *adapter = netdev_priv(netdev); 2232 u32 vfta, index; 2233 2234 /* remove VID from filter table */ 2235 2236 index = (vid >> 5) & 0x7F; 2237 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index); 2238 vfta &= ~(1 << (vid & 0x1F)); 2239 ixgb_write_vfta(&adapter->hw, index, vfta); 2240 clear_bit(vid, adapter->active_vlans); 2241 2242 return 0; 2243} 2244 2245static void 2246ixgb_restore_vlan(struct ixgb_adapter *adapter) 2247{ 2248 u16 vid; 2249 2250 for_each_set_bit(vid, adapter->active_vlans, VLAN_N_VID) 2251 ixgb_vlan_rx_add_vid(adapter->netdev, vid); 2252} 2253 2254#ifdef CONFIG_NET_POLL_CONTROLLER 2255/* 2256 * Polling 'interrupt' - used by things like netconsole to send skbs 2257 * without having to re-enable interrupts. It's not called while 2258 * the interrupt routine is executing. 2259 */ 2260 2261static void ixgb_netpoll(struct net_device *dev) 2262{ 2263 struct ixgb_adapter *adapter = netdev_priv(dev); 2264 2265 disable_irq(adapter->pdev->irq); 2266 ixgb_intr(adapter->pdev->irq, dev); 2267 enable_irq(adapter->pdev->irq); 2268} 2269#endif 2270 2271/** 2272 * ixgb_io_error_detected - called when PCI error is detected 2273 * @pdev: pointer to pci device with error 2274 * @state: pci channel state after error 2275 * 2276 * This callback is called by the PCI subsystem whenever 2277 * a PCI bus error is detected. 2278 */ 2279static pci_ers_result_t ixgb_io_error_detected(struct pci_dev *pdev, 2280 enum pci_channel_state state) 2281{ 2282 struct net_device *netdev = pci_get_drvdata(pdev); 2283 struct ixgb_adapter *adapter = netdev_priv(netdev); 2284 2285 netif_device_detach(netdev); 2286 2287 if (state == pci_channel_io_perm_failure) 2288 return PCI_ERS_RESULT_DISCONNECT; 2289 2290 if (netif_running(netdev)) 2291 ixgb_down(adapter, true); 2292 2293 pci_disable_device(pdev); 2294 2295 /* Request a slot reset. */ 2296 return PCI_ERS_RESULT_NEED_RESET; 2297} 2298 2299/** 2300 * ixgb_io_slot_reset - called after the pci bus has been reset. 2301 * @pdev pointer to pci device with error 2302 * 2303 * This callback is called after the PCI bus has been reset. 2304 * Basically, this tries to restart the card from scratch. 2305 * This is a shortened version of the device probe/discovery code, 2306 * it resembles the first-half of the ixgb_probe() routine. 2307 */ 2308static pci_ers_result_t ixgb_io_slot_reset(struct pci_dev *pdev) 2309{ 2310 struct net_device *netdev = pci_get_drvdata(pdev); 2311 struct ixgb_adapter *adapter = netdev_priv(netdev); 2312 2313 if (pci_enable_device(pdev)) { 2314 netif_err(adapter, probe, adapter->netdev, 2315 "Cannot re-enable PCI device after reset\n"); 2316 return PCI_ERS_RESULT_DISCONNECT; 2317 } 2318 2319 /* Perform card reset only on one instance of the card */ 2320 if (0 != PCI_FUNC (pdev->devfn)) 2321 return PCI_ERS_RESULT_RECOVERED; 2322 2323 pci_set_master(pdev); 2324 2325 netif_carrier_off(netdev); 2326 netif_stop_queue(netdev); 2327 ixgb_reset(adapter); 2328 2329 /* Make sure the EEPROM is good */ 2330 if (!ixgb_validate_eeprom_checksum(&adapter->hw)) { 2331 netif_err(adapter, probe, adapter->netdev, 2332 "After reset, the EEPROM checksum is not valid\n"); 2333 return PCI_ERS_RESULT_DISCONNECT; 2334 } 2335 ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr); 2336 memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len); 2337 2338 if (!is_valid_ether_addr(netdev->perm_addr)) { 2339 netif_err(adapter, probe, adapter->netdev, 2340 "After reset, invalid MAC address\n"); 2341 return PCI_ERS_RESULT_DISCONNECT; 2342 } 2343 2344 return PCI_ERS_RESULT_RECOVERED; 2345} 2346 2347/** 2348 * ixgb_io_resume - called when its OK to resume normal operations 2349 * @pdev pointer to pci device with error 2350 * 2351 * The error recovery driver tells us that its OK to resume 2352 * normal operation. Implementation resembles the second-half 2353 * of the ixgb_probe() routine. 2354 */ 2355static void ixgb_io_resume(struct pci_dev *pdev) 2356{ 2357 struct net_device *netdev = pci_get_drvdata(pdev); 2358 struct ixgb_adapter *adapter = netdev_priv(netdev); 2359 2360 pci_set_master(pdev); 2361 2362 if (netif_running(netdev)) { 2363 if (ixgb_up(adapter)) { 2364 pr_err("can't bring device back up after reset\n"); 2365 return; 2366 } 2367 } 2368 2369 netif_device_attach(netdev); 2370 mod_timer(&adapter->watchdog_timer, jiffies); 2371} 2372 2373/* ixgb_main.c */ 2374