ixgb_main.c revision 9e903e085262ffbf1fc44a17ac06058aca03524a
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 {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX, 58 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0}, 59 {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_CX4, 60 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0}, 61 {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_SR, 62 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0}, 63 {INTEL_VENDOR_ID, 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 __devexit 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 void ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid); 105static void 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 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 = __devexit_p(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_DEBUG_LEVEL_SHIFT 3 138static int debug = DEFAULT_DEBUG_LEVEL_SHIFT; 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 == SUN_SUBVENDOR_ID) 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 = 1; 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 u32 329ixgb_fix_features(struct net_device *netdev, u32 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_RX)) 336 features &= ~NETIF_F_HW_VLAN_TX; 337 338 return features; 339} 340 341static int 342ixgb_set_features(struct net_device *netdev, u32 features) 343{ 344 struct ixgb_adapter *adapter = netdev_priv(netdev); 345 u32 changed = features ^ netdev->features; 346 347 if (!(changed & (NETIF_F_RXCSUM|NETIF_F_HW_VLAN_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 __devinit 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_DEBUG_LEVEL_SHIFT); 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_TX | 483 NETIF_F_HW_VLAN_RX; 484 netdev->features = netdev->hw_features | 485 NETIF_F_HW_VLAN_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 memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len); 504 505 if (!is_valid_ether_addr(netdev->perm_addr)) { 506 netif_err(adapter, probe, adapter->netdev, "Invalid MAC Address\n"); 507 err = -EIO; 508 goto err_eeprom; 509 } 510 511 adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw); 512 513 init_timer(&adapter->watchdog_timer); 514 adapter->watchdog_timer.function = ixgb_watchdog; 515 adapter->watchdog_timer.data = (unsigned long)adapter; 516 517 INIT_WORK(&adapter->tx_timeout_task, ixgb_tx_timeout_task); 518 519 strcpy(netdev->name, "eth%d"); 520 err = register_netdev(netdev); 521 if (err) 522 goto err_register; 523 524 /* carrier off reporting is important to ethtool even BEFORE open */ 525 netif_carrier_off(netdev); 526 527 netif_info(adapter, probe, adapter->netdev, 528 "Intel(R) PRO/10GbE Network Connection\n"); 529 ixgb_check_options(adapter); 530 /* reset the hardware with the new settings */ 531 532 ixgb_reset(adapter); 533 534 cards_found++; 535 return 0; 536 537err_register: 538err_sw_init: 539err_eeprom: 540 iounmap(adapter->hw.hw_addr); 541err_ioremap: 542 free_netdev(netdev); 543err_alloc_etherdev: 544 pci_release_regions(pdev); 545err_request_regions: 546err_dma_mask: 547 pci_disable_device(pdev); 548 return err; 549} 550 551/** 552 * ixgb_remove - Device Removal Routine 553 * @pdev: PCI device information struct 554 * 555 * ixgb_remove is called by the PCI subsystem to alert the driver 556 * that it should release a PCI device. The could be caused by a 557 * Hot-Plug event, or because the driver is going to be removed from 558 * memory. 559 **/ 560 561static void __devexit 562ixgb_remove(struct pci_dev *pdev) 563{ 564 struct net_device *netdev = pci_get_drvdata(pdev); 565 struct ixgb_adapter *adapter = netdev_priv(netdev); 566 567 cancel_work_sync(&adapter->tx_timeout_task); 568 569 unregister_netdev(netdev); 570 571 iounmap(adapter->hw.hw_addr); 572 pci_release_regions(pdev); 573 574 free_netdev(netdev); 575 pci_disable_device(pdev); 576} 577 578/** 579 * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter) 580 * @adapter: board private structure to initialize 581 * 582 * ixgb_sw_init initializes the Adapter private data structure. 583 * Fields are initialized based on PCI device information and 584 * OS network device settings (MTU size). 585 **/ 586 587static int __devinit 588ixgb_sw_init(struct ixgb_adapter *adapter) 589{ 590 struct ixgb_hw *hw = &adapter->hw; 591 struct net_device *netdev = adapter->netdev; 592 struct pci_dev *pdev = adapter->pdev; 593 594 /* PCI config space info */ 595 596 hw->vendor_id = pdev->vendor; 597 hw->device_id = pdev->device; 598 hw->subsystem_vendor_id = pdev->subsystem_vendor; 599 hw->subsystem_id = pdev->subsystem_device; 600 601 hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH; 602 adapter->rx_buffer_len = hw->max_frame_size + 8; /* + 8 for errata */ 603 604 if ((hw->device_id == IXGB_DEVICE_ID_82597EX) || 605 (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4) || 606 (hw->device_id == IXGB_DEVICE_ID_82597EX_LR) || 607 (hw->device_id == IXGB_DEVICE_ID_82597EX_SR)) 608 hw->mac_type = ixgb_82597; 609 else { 610 /* should never have loaded on this device */ 611 netif_err(adapter, probe, adapter->netdev, "unsupported device id\n"); 612 } 613 614 /* enable flow control to be programmed */ 615 hw->fc.send_xon = 1; 616 617 set_bit(__IXGB_DOWN, &adapter->flags); 618 return 0; 619} 620 621/** 622 * ixgb_open - Called when a network interface is made active 623 * @netdev: network interface device structure 624 * 625 * Returns 0 on success, negative value on failure 626 * 627 * The open entry point is called when a network interface is made 628 * active by the system (IFF_UP). At this point all resources needed 629 * for transmit and receive operations are allocated, the interrupt 630 * handler is registered with the OS, the watchdog timer is started, 631 * and the stack is notified that the interface is ready. 632 **/ 633 634static int 635ixgb_open(struct net_device *netdev) 636{ 637 struct ixgb_adapter *adapter = netdev_priv(netdev); 638 int err; 639 640 /* allocate transmit descriptors */ 641 err = ixgb_setup_tx_resources(adapter); 642 if (err) 643 goto err_setup_tx; 644 645 netif_carrier_off(netdev); 646 647 /* allocate receive descriptors */ 648 649 err = ixgb_setup_rx_resources(adapter); 650 if (err) 651 goto err_setup_rx; 652 653 err = ixgb_up(adapter); 654 if (err) 655 goto err_up; 656 657 netif_start_queue(netdev); 658 659 return 0; 660 661err_up: 662 ixgb_free_rx_resources(adapter); 663err_setup_rx: 664 ixgb_free_tx_resources(adapter); 665err_setup_tx: 666 ixgb_reset(adapter); 667 668 return err; 669} 670 671/** 672 * ixgb_close - Disables a network interface 673 * @netdev: network interface device structure 674 * 675 * Returns 0, this is not allowed to fail 676 * 677 * The close entry point is called when an interface is de-activated 678 * by the OS. The hardware is still under the drivers control, but 679 * needs to be disabled. A global MAC reset is issued to stop the 680 * hardware, and all transmit and receive resources are freed. 681 **/ 682 683static int 684ixgb_close(struct net_device *netdev) 685{ 686 struct ixgb_adapter *adapter = netdev_priv(netdev); 687 688 ixgb_down(adapter, true); 689 690 ixgb_free_tx_resources(adapter); 691 ixgb_free_rx_resources(adapter); 692 693 return 0; 694} 695 696/** 697 * ixgb_setup_tx_resources - allocate Tx resources (Descriptors) 698 * @adapter: board private structure 699 * 700 * Return 0 on success, negative on failure 701 **/ 702 703int 704ixgb_setup_tx_resources(struct ixgb_adapter *adapter) 705{ 706 struct ixgb_desc_ring *txdr = &adapter->tx_ring; 707 struct pci_dev *pdev = adapter->pdev; 708 int size; 709 710 size = sizeof(struct ixgb_buffer) * txdr->count; 711 txdr->buffer_info = vzalloc(size); 712 if (!txdr->buffer_info) { 713 netif_err(adapter, probe, adapter->netdev, 714 "Unable to allocate transmit descriptor ring memory\n"); 715 return -ENOMEM; 716 } 717 718 /* round up to nearest 4K */ 719 720 txdr->size = txdr->count * sizeof(struct ixgb_tx_desc); 721 txdr->size = ALIGN(txdr->size, 4096); 722 723 txdr->desc = dma_alloc_coherent(&pdev->dev, txdr->size, &txdr->dma, 724 GFP_KERNEL); 725 if (!txdr->desc) { 726 vfree(txdr->buffer_info); 727 netif_err(adapter, probe, adapter->netdev, 728 "Unable to allocate transmit descriptor memory\n"); 729 return -ENOMEM; 730 } 731 memset(txdr->desc, 0, txdr->size); 732 733 txdr->next_to_use = 0; 734 txdr->next_to_clean = 0; 735 736 return 0; 737} 738 739/** 740 * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset. 741 * @adapter: board private structure 742 * 743 * Configure the Tx unit of the MAC after a reset. 744 **/ 745 746static void 747ixgb_configure_tx(struct ixgb_adapter *adapter) 748{ 749 u64 tdba = adapter->tx_ring.dma; 750 u32 tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc); 751 u32 tctl; 752 struct ixgb_hw *hw = &adapter->hw; 753 754 /* Setup the Base and Length of the Tx Descriptor Ring 755 * tx_ring.dma can be either a 32 or 64 bit value 756 */ 757 758 IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL)); 759 IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32)); 760 761 IXGB_WRITE_REG(hw, TDLEN, tdlen); 762 763 /* Setup the HW Tx Head and Tail descriptor pointers */ 764 765 IXGB_WRITE_REG(hw, TDH, 0); 766 IXGB_WRITE_REG(hw, TDT, 0); 767 768 /* don't set up txdctl, it induces performance problems if configured 769 * incorrectly */ 770 /* Set the Tx Interrupt Delay register */ 771 772 IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay); 773 774 /* Program the Transmit Control Register */ 775 776 tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE; 777 IXGB_WRITE_REG(hw, TCTL, tctl); 778 779 /* Setup Transmit Descriptor Settings for this adapter */ 780 adapter->tx_cmd_type = 781 IXGB_TX_DESC_TYPE | 782 (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0); 783} 784 785/** 786 * ixgb_setup_rx_resources - allocate Rx resources (Descriptors) 787 * @adapter: board private structure 788 * 789 * Returns 0 on success, negative on failure 790 **/ 791 792int 793ixgb_setup_rx_resources(struct ixgb_adapter *adapter) 794{ 795 struct ixgb_desc_ring *rxdr = &adapter->rx_ring; 796 struct pci_dev *pdev = adapter->pdev; 797 int size; 798 799 size = sizeof(struct ixgb_buffer) * rxdr->count; 800 rxdr->buffer_info = vzalloc(size); 801 if (!rxdr->buffer_info) { 802 netif_err(adapter, probe, adapter->netdev, 803 "Unable to allocate receive descriptor ring\n"); 804 return -ENOMEM; 805 } 806 807 /* Round up to nearest 4K */ 808 809 rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc); 810 rxdr->size = ALIGN(rxdr->size, 4096); 811 812 rxdr->desc = dma_alloc_coherent(&pdev->dev, rxdr->size, &rxdr->dma, 813 GFP_KERNEL); 814 815 if (!rxdr->desc) { 816 vfree(rxdr->buffer_info); 817 netif_err(adapter, probe, adapter->netdev, 818 "Unable to allocate receive descriptors\n"); 819 return -ENOMEM; 820 } 821 memset(rxdr->desc, 0, rxdr->size); 822 823 rxdr->next_to_clean = 0; 824 rxdr->next_to_use = 0; 825 826 return 0; 827} 828 829/** 830 * ixgb_setup_rctl - configure the receive control register 831 * @adapter: Board private structure 832 **/ 833 834static void 835ixgb_setup_rctl(struct ixgb_adapter *adapter) 836{ 837 u32 rctl; 838 839 rctl = IXGB_READ_REG(&adapter->hw, RCTL); 840 841 rctl &= ~(3 << IXGB_RCTL_MO_SHIFT); 842 843 rctl |= 844 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 | 845 IXGB_RCTL_RXEN | IXGB_RCTL_CFF | 846 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT); 847 848 rctl |= IXGB_RCTL_SECRC; 849 850 if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048) 851 rctl |= IXGB_RCTL_BSIZE_2048; 852 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096) 853 rctl |= IXGB_RCTL_BSIZE_4096; 854 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192) 855 rctl |= IXGB_RCTL_BSIZE_8192; 856 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384) 857 rctl |= IXGB_RCTL_BSIZE_16384; 858 859 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl); 860} 861 862/** 863 * ixgb_configure_rx - Configure 82597 Receive Unit after Reset. 864 * @adapter: board private structure 865 * 866 * Configure the Rx unit of the MAC after a reset. 867 **/ 868 869static void 870ixgb_configure_rx(struct ixgb_adapter *adapter) 871{ 872 u64 rdba = adapter->rx_ring.dma; 873 u32 rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc); 874 struct ixgb_hw *hw = &adapter->hw; 875 u32 rctl; 876 u32 rxcsum; 877 878 /* make sure receives are disabled while setting up the descriptors */ 879 880 rctl = IXGB_READ_REG(hw, RCTL); 881 IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN); 882 883 /* set the Receive Delay Timer Register */ 884 885 IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay); 886 887 /* Setup the Base and Length of the Rx Descriptor Ring */ 888 889 IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL)); 890 IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32)); 891 892 IXGB_WRITE_REG(hw, RDLEN, rdlen); 893 894 /* Setup the HW Rx Head and Tail Descriptor Pointers */ 895 IXGB_WRITE_REG(hw, RDH, 0); 896 IXGB_WRITE_REG(hw, RDT, 0); 897 898 /* due to the hardware errata with RXDCTL, we are unable to use any of 899 * the performance enhancing features of it without causing other 900 * subtle bugs, some of the bugs could include receive length 901 * corruption at high data rates (WTHRESH > 0) and/or receive 902 * descriptor ring irregularites (particularly in hardware cache) */ 903 IXGB_WRITE_REG(hw, RXDCTL, 0); 904 905 /* Enable Receive Checksum Offload for TCP and UDP */ 906 if (adapter->rx_csum) { 907 rxcsum = IXGB_READ_REG(hw, RXCSUM); 908 rxcsum |= IXGB_RXCSUM_TUOFL; 909 IXGB_WRITE_REG(hw, RXCSUM, rxcsum); 910 } 911 912 /* Enable Receives */ 913 914 IXGB_WRITE_REG(hw, RCTL, rctl); 915} 916 917/** 918 * ixgb_free_tx_resources - Free Tx Resources 919 * @adapter: board private structure 920 * 921 * Free all transmit software resources 922 **/ 923 924void 925ixgb_free_tx_resources(struct ixgb_adapter *adapter) 926{ 927 struct pci_dev *pdev = adapter->pdev; 928 929 ixgb_clean_tx_ring(adapter); 930 931 vfree(adapter->tx_ring.buffer_info); 932 adapter->tx_ring.buffer_info = NULL; 933 934 dma_free_coherent(&pdev->dev, adapter->tx_ring.size, 935 adapter->tx_ring.desc, adapter->tx_ring.dma); 936 937 adapter->tx_ring.desc = NULL; 938} 939 940static void 941ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter, 942 struct ixgb_buffer *buffer_info) 943{ 944 if (buffer_info->dma) { 945 if (buffer_info->mapped_as_page) 946 dma_unmap_page(&adapter->pdev->dev, buffer_info->dma, 947 buffer_info->length, DMA_TO_DEVICE); 948 else 949 dma_unmap_single(&adapter->pdev->dev, buffer_info->dma, 950 buffer_info->length, DMA_TO_DEVICE); 951 buffer_info->dma = 0; 952 } 953 954 if (buffer_info->skb) { 955 dev_kfree_skb_any(buffer_info->skb); 956 buffer_info->skb = NULL; 957 } 958 buffer_info->time_stamp = 0; 959 /* these fields must always be initialized in tx 960 * buffer_info->length = 0; 961 * buffer_info->next_to_watch = 0; */ 962} 963 964/** 965 * ixgb_clean_tx_ring - Free Tx Buffers 966 * @adapter: board private structure 967 **/ 968 969static void 970ixgb_clean_tx_ring(struct ixgb_adapter *adapter) 971{ 972 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring; 973 struct ixgb_buffer *buffer_info; 974 unsigned long size; 975 unsigned int i; 976 977 /* Free all the Tx ring sk_buffs */ 978 979 for (i = 0; i < tx_ring->count; i++) { 980 buffer_info = &tx_ring->buffer_info[i]; 981 ixgb_unmap_and_free_tx_resource(adapter, buffer_info); 982 } 983 984 size = sizeof(struct ixgb_buffer) * tx_ring->count; 985 memset(tx_ring->buffer_info, 0, size); 986 987 /* Zero out the descriptor ring */ 988 989 memset(tx_ring->desc, 0, tx_ring->size); 990 991 tx_ring->next_to_use = 0; 992 tx_ring->next_to_clean = 0; 993 994 IXGB_WRITE_REG(&adapter->hw, TDH, 0); 995 IXGB_WRITE_REG(&adapter->hw, TDT, 0); 996} 997 998/** 999 * ixgb_free_rx_resources - Free Rx Resources 1000 * @adapter: board private structure 1001 * 1002 * Free all receive software resources 1003 **/ 1004 1005void 1006ixgb_free_rx_resources(struct ixgb_adapter *adapter) 1007{ 1008 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring; 1009 struct pci_dev *pdev = adapter->pdev; 1010 1011 ixgb_clean_rx_ring(adapter); 1012 1013 vfree(rx_ring->buffer_info); 1014 rx_ring->buffer_info = NULL; 1015 1016 dma_free_coherent(&pdev->dev, rx_ring->size, rx_ring->desc, 1017 rx_ring->dma); 1018 1019 rx_ring->desc = NULL; 1020} 1021 1022/** 1023 * ixgb_clean_rx_ring - Free Rx Buffers 1024 * @adapter: board private structure 1025 **/ 1026 1027static void 1028ixgb_clean_rx_ring(struct ixgb_adapter *adapter) 1029{ 1030 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring; 1031 struct ixgb_buffer *buffer_info; 1032 struct pci_dev *pdev = adapter->pdev; 1033 unsigned long size; 1034 unsigned int i; 1035 1036 /* Free all the Rx ring sk_buffs */ 1037 1038 for (i = 0; i < rx_ring->count; i++) { 1039 buffer_info = &rx_ring->buffer_info[i]; 1040 if (buffer_info->dma) { 1041 dma_unmap_single(&pdev->dev, 1042 buffer_info->dma, 1043 buffer_info->length, 1044 DMA_FROM_DEVICE); 1045 buffer_info->dma = 0; 1046 buffer_info->length = 0; 1047 } 1048 1049 if (buffer_info->skb) { 1050 dev_kfree_skb(buffer_info->skb); 1051 buffer_info->skb = NULL; 1052 } 1053 } 1054 1055 size = sizeof(struct ixgb_buffer) * rx_ring->count; 1056 memset(rx_ring->buffer_info, 0, size); 1057 1058 /* Zero out the descriptor ring */ 1059 1060 memset(rx_ring->desc, 0, rx_ring->size); 1061 1062 rx_ring->next_to_clean = 0; 1063 rx_ring->next_to_use = 0; 1064 1065 IXGB_WRITE_REG(&adapter->hw, RDH, 0); 1066 IXGB_WRITE_REG(&adapter->hw, RDT, 0); 1067} 1068 1069/** 1070 * ixgb_set_mac - Change the Ethernet Address of the NIC 1071 * @netdev: network interface device structure 1072 * @p: pointer to an address structure 1073 * 1074 * Returns 0 on success, negative on failure 1075 **/ 1076 1077static int 1078ixgb_set_mac(struct net_device *netdev, void *p) 1079{ 1080 struct ixgb_adapter *adapter = netdev_priv(netdev); 1081 struct sockaddr *addr = p; 1082 1083 if (!is_valid_ether_addr(addr->sa_data)) 1084 return -EADDRNOTAVAIL; 1085 1086 memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len); 1087 1088 ixgb_rar_set(&adapter->hw, addr->sa_data, 0); 1089 1090 return 0; 1091} 1092 1093/** 1094 * ixgb_set_multi - Multicast and Promiscuous mode set 1095 * @netdev: network interface device structure 1096 * 1097 * The set_multi entry point is called whenever the multicast address 1098 * list or the network interface flags are updated. This routine is 1099 * responsible for configuring the hardware for proper multicast, 1100 * promiscuous mode, and all-multi behavior. 1101 **/ 1102 1103static void 1104ixgb_set_multi(struct net_device *netdev) 1105{ 1106 struct ixgb_adapter *adapter = netdev_priv(netdev); 1107 struct ixgb_hw *hw = &adapter->hw; 1108 struct netdev_hw_addr *ha; 1109 u32 rctl; 1110 1111 /* Check for Promiscuous and All Multicast modes */ 1112 1113 rctl = IXGB_READ_REG(hw, RCTL); 1114 1115 if (netdev->flags & IFF_PROMISC) { 1116 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE); 1117 /* disable VLAN filtering */ 1118 rctl &= ~IXGB_RCTL_CFIEN; 1119 rctl &= ~IXGB_RCTL_VFE; 1120 } else { 1121 if (netdev->flags & IFF_ALLMULTI) { 1122 rctl |= IXGB_RCTL_MPE; 1123 rctl &= ~IXGB_RCTL_UPE; 1124 } else { 1125 rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE); 1126 } 1127 /* enable VLAN filtering */ 1128 rctl |= IXGB_RCTL_VFE; 1129 rctl &= ~IXGB_RCTL_CFIEN; 1130 } 1131 1132 if (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES) { 1133 rctl |= IXGB_RCTL_MPE; 1134 IXGB_WRITE_REG(hw, RCTL, rctl); 1135 } else { 1136 u8 *mta = kmalloc(IXGB_MAX_NUM_MULTICAST_ADDRESSES * 1137 ETH_ALEN, GFP_ATOMIC); 1138 u8 *addr; 1139 if (!mta) { 1140 pr_err("allocation of multicast memory failed\n"); 1141 goto alloc_failed; 1142 } 1143 1144 IXGB_WRITE_REG(hw, RCTL, rctl); 1145 1146 addr = mta; 1147 netdev_for_each_mc_addr(ha, netdev) { 1148 memcpy(addr, ha->addr, ETH_ALEN); 1149 addr += ETH_ALEN; 1150 } 1151 1152 ixgb_mc_addr_list_update(hw, mta, netdev_mc_count(netdev), 0); 1153 kfree(mta); 1154 } 1155 1156alloc_failed: 1157 if (netdev->features & NETIF_F_HW_VLAN_RX) 1158 ixgb_vlan_strip_enable(adapter); 1159 else 1160 ixgb_vlan_strip_disable(adapter); 1161 1162} 1163 1164/** 1165 * ixgb_watchdog - Timer Call-back 1166 * @data: pointer to netdev cast into an unsigned long 1167 **/ 1168 1169static void 1170ixgb_watchdog(unsigned long data) 1171{ 1172 struct ixgb_adapter *adapter = (struct ixgb_adapter *)data; 1173 struct net_device *netdev = adapter->netdev; 1174 struct ixgb_desc_ring *txdr = &adapter->tx_ring; 1175 1176 ixgb_check_for_link(&adapter->hw); 1177 1178 if (ixgb_check_for_bad_link(&adapter->hw)) { 1179 /* force the reset path */ 1180 netif_stop_queue(netdev); 1181 } 1182 1183 if (adapter->hw.link_up) { 1184 if (!netif_carrier_ok(netdev)) { 1185 netdev_info(netdev, 1186 "NIC Link is Up 10 Gbps Full Duplex, Flow Control: %s\n", 1187 (adapter->hw.fc.type == ixgb_fc_full) ? 1188 "RX/TX" : 1189 (adapter->hw.fc.type == ixgb_fc_rx_pause) ? 1190 "RX" : 1191 (adapter->hw.fc.type == ixgb_fc_tx_pause) ? 1192 "TX" : "None"); 1193 adapter->link_speed = 10000; 1194 adapter->link_duplex = FULL_DUPLEX; 1195 netif_carrier_on(netdev); 1196 } 1197 } else { 1198 if (netif_carrier_ok(netdev)) { 1199 adapter->link_speed = 0; 1200 adapter->link_duplex = 0; 1201 netdev_info(netdev, "NIC Link is Down\n"); 1202 netif_carrier_off(netdev); 1203 } 1204 } 1205 1206 ixgb_update_stats(adapter); 1207 1208 if (!netif_carrier_ok(netdev)) { 1209 if (IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) { 1210 /* We've lost link, so the controller stops DMA, 1211 * but we've got queued Tx work that's never going 1212 * to get done, so reset controller to flush Tx. 1213 * (Do the reset outside of interrupt context). */ 1214 schedule_work(&adapter->tx_timeout_task); 1215 /* return immediately since reset is imminent */ 1216 return; 1217 } 1218 } 1219 1220 /* Force detection of hung controller every watchdog period */ 1221 adapter->detect_tx_hung = true; 1222 1223 /* generate an interrupt to force clean up of any stragglers */ 1224 IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW); 1225 1226 /* Reset the timer */ 1227 mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ); 1228} 1229 1230#define IXGB_TX_FLAGS_CSUM 0x00000001 1231#define IXGB_TX_FLAGS_VLAN 0x00000002 1232#define IXGB_TX_FLAGS_TSO 0x00000004 1233 1234static int 1235ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb) 1236{ 1237 struct ixgb_context_desc *context_desc; 1238 unsigned int i; 1239 u8 ipcss, ipcso, tucss, tucso, hdr_len; 1240 u16 ipcse, tucse, mss; 1241 int err; 1242 1243 if (likely(skb_is_gso(skb))) { 1244 struct ixgb_buffer *buffer_info; 1245 struct iphdr *iph; 1246 1247 if (skb_header_cloned(skb)) { 1248 err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC); 1249 if (err) 1250 return err; 1251 } 1252 1253 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb); 1254 mss = skb_shinfo(skb)->gso_size; 1255 iph = ip_hdr(skb); 1256 iph->tot_len = 0; 1257 iph->check = 0; 1258 tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr, 1259 iph->daddr, 0, 1260 IPPROTO_TCP, 0); 1261 ipcss = skb_network_offset(skb); 1262 ipcso = (void *)&(iph->check) - (void *)skb->data; 1263 ipcse = skb_transport_offset(skb) - 1; 1264 tucss = skb_transport_offset(skb); 1265 tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data; 1266 tucse = 0; 1267 1268 i = adapter->tx_ring.next_to_use; 1269 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i); 1270 buffer_info = &adapter->tx_ring.buffer_info[i]; 1271 WARN_ON(buffer_info->dma != 0); 1272 1273 context_desc->ipcss = ipcss; 1274 context_desc->ipcso = ipcso; 1275 context_desc->ipcse = cpu_to_le16(ipcse); 1276 context_desc->tucss = tucss; 1277 context_desc->tucso = tucso; 1278 context_desc->tucse = cpu_to_le16(tucse); 1279 context_desc->mss = cpu_to_le16(mss); 1280 context_desc->hdr_len = hdr_len; 1281 context_desc->status = 0; 1282 context_desc->cmd_type_len = cpu_to_le32( 1283 IXGB_CONTEXT_DESC_TYPE 1284 | IXGB_CONTEXT_DESC_CMD_TSE 1285 | IXGB_CONTEXT_DESC_CMD_IP 1286 | IXGB_CONTEXT_DESC_CMD_TCP 1287 | IXGB_CONTEXT_DESC_CMD_IDE 1288 | (skb->len - (hdr_len))); 1289 1290 1291 if (++i == adapter->tx_ring.count) i = 0; 1292 adapter->tx_ring.next_to_use = i; 1293 1294 return 1; 1295 } 1296 1297 return 0; 1298} 1299 1300static bool 1301ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb) 1302{ 1303 struct ixgb_context_desc *context_desc; 1304 unsigned int i; 1305 u8 css, cso; 1306 1307 if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) { 1308 struct ixgb_buffer *buffer_info; 1309 css = skb_checksum_start_offset(skb); 1310 cso = css + skb->csum_offset; 1311 1312 i = adapter->tx_ring.next_to_use; 1313 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i); 1314 buffer_info = &adapter->tx_ring.buffer_info[i]; 1315 WARN_ON(buffer_info->dma != 0); 1316 1317 context_desc->tucss = css; 1318 context_desc->tucso = cso; 1319 context_desc->tucse = 0; 1320 /* zero out any previously existing data in one instruction */ 1321 *(u32 *)&(context_desc->ipcss) = 0; 1322 context_desc->status = 0; 1323 context_desc->hdr_len = 0; 1324 context_desc->mss = 0; 1325 context_desc->cmd_type_len = 1326 cpu_to_le32(IXGB_CONTEXT_DESC_TYPE 1327 | IXGB_TX_DESC_CMD_IDE); 1328 1329 if (++i == adapter->tx_ring.count) i = 0; 1330 adapter->tx_ring.next_to_use = i; 1331 1332 return true; 1333 } 1334 1335 return false; 1336} 1337 1338#define IXGB_MAX_TXD_PWR 14 1339#define IXGB_MAX_DATA_PER_TXD (1<<IXGB_MAX_TXD_PWR) 1340 1341static int 1342ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb, 1343 unsigned int first) 1344{ 1345 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring; 1346 struct pci_dev *pdev = adapter->pdev; 1347 struct ixgb_buffer *buffer_info; 1348 int len = skb_headlen(skb); 1349 unsigned int offset = 0, size, count = 0, i; 1350 unsigned int mss = skb_shinfo(skb)->gso_size; 1351 unsigned int nr_frags = skb_shinfo(skb)->nr_frags; 1352 unsigned int f; 1353 1354 i = tx_ring->next_to_use; 1355 1356 while (len) { 1357 buffer_info = &tx_ring->buffer_info[i]; 1358 size = min(len, IXGB_MAX_DATA_PER_TXD); 1359 /* Workaround for premature desc write-backs 1360 * in TSO mode. Append 4-byte sentinel desc */ 1361 if (unlikely(mss && !nr_frags && size == len && size > 8)) 1362 size -= 4; 1363 1364 buffer_info->length = size; 1365 WARN_ON(buffer_info->dma != 0); 1366 buffer_info->time_stamp = jiffies; 1367 buffer_info->mapped_as_page = false; 1368 buffer_info->dma = dma_map_single(&pdev->dev, 1369 skb->data + offset, 1370 size, DMA_TO_DEVICE); 1371 if (dma_mapping_error(&pdev->dev, buffer_info->dma)) 1372 goto dma_error; 1373 buffer_info->next_to_watch = 0; 1374 1375 len -= size; 1376 offset += size; 1377 count++; 1378 if (len) { 1379 i++; 1380 if (i == tx_ring->count) 1381 i = 0; 1382 } 1383 } 1384 1385 for (f = 0; f < nr_frags; f++) { 1386 const struct skb_frag_struct *frag; 1387 1388 frag = &skb_shinfo(skb)->frags[f]; 1389 len = skb_frag_size(frag); 1390 offset = 0; 1391 1392 while (len) { 1393 i++; 1394 if (i == tx_ring->count) 1395 i = 0; 1396 1397 buffer_info = &tx_ring->buffer_info[i]; 1398 size = min(len, IXGB_MAX_DATA_PER_TXD); 1399 1400 /* Workaround for premature desc write-backs 1401 * in TSO mode. Append 4-byte sentinel desc */ 1402 if (unlikely(mss && (f == (nr_frags - 1)) 1403 && size == len && size > 8)) 1404 size -= 4; 1405 1406 buffer_info->length = size; 1407 buffer_info->time_stamp = jiffies; 1408 buffer_info->mapped_as_page = true; 1409 buffer_info->dma = 1410 skb_frag_dma_map(&pdev->dev, frag, offset, size, 1411 DMA_TO_DEVICE); 1412 if (dma_mapping_error(&pdev->dev, buffer_info->dma)) 1413 goto dma_error; 1414 buffer_info->next_to_watch = 0; 1415 1416 len -= size; 1417 offset += size; 1418 count++; 1419 } 1420 } 1421 tx_ring->buffer_info[i].skb = skb; 1422 tx_ring->buffer_info[first].next_to_watch = i; 1423 1424 return count; 1425 1426dma_error: 1427 dev_err(&pdev->dev, "TX DMA map failed\n"); 1428 buffer_info->dma = 0; 1429 if (count) 1430 count--; 1431 1432 while (count--) { 1433 if (i==0) 1434 i += tx_ring->count; 1435 i--; 1436 buffer_info = &tx_ring->buffer_info[i]; 1437 ixgb_unmap_and_free_tx_resource(adapter, buffer_info); 1438 } 1439 1440 return 0; 1441} 1442 1443static void 1444ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags) 1445{ 1446 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring; 1447 struct ixgb_tx_desc *tx_desc = NULL; 1448 struct ixgb_buffer *buffer_info; 1449 u32 cmd_type_len = adapter->tx_cmd_type; 1450 u8 status = 0; 1451 u8 popts = 0; 1452 unsigned int i; 1453 1454 if (tx_flags & IXGB_TX_FLAGS_TSO) { 1455 cmd_type_len |= IXGB_TX_DESC_CMD_TSE; 1456 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM); 1457 } 1458 1459 if (tx_flags & IXGB_TX_FLAGS_CSUM) 1460 popts |= IXGB_TX_DESC_POPTS_TXSM; 1461 1462 if (tx_flags & IXGB_TX_FLAGS_VLAN) 1463 cmd_type_len |= IXGB_TX_DESC_CMD_VLE; 1464 1465 i = tx_ring->next_to_use; 1466 1467 while (count--) { 1468 buffer_info = &tx_ring->buffer_info[i]; 1469 tx_desc = IXGB_TX_DESC(*tx_ring, i); 1470 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma); 1471 tx_desc->cmd_type_len = 1472 cpu_to_le32(cmd_type_len | buffer_info->length); 1473 tx_desc->status = status; 1474 tx_desc->popts = popts; 1475 tx_desc->vlan = cpu_to_le16(vlan_id); 1476 1477 if (++i == tx_ring->count) i = 0; 1478 } 1479 1480 tx_desc->cmd_type_len |= 1481 cpu_to_le32(IXGB_TX_DESC_CMD_EOP | IXGB_TX_DESC_CMD_RS); 1482 1483 /* Force memory writes to complete before letting h/w 1484 * know there are new descriptors to fetch. (Only 1485 * applicable for weak-ordered memory model archs, 1486 * such as IA-64). */ 1487 wmb(); 1488 1489 tx_ring->next_to_use = i; 1490 IXGB_WRITE_REG(&adapter->hw, TDT, i); 1491} 1492 1493static int __ixgb_maybe_stop_tx(struct net_device *netdev, int size) 1494{ 1495 struct ixgb_adapter *adapter = netdev_priv(netdev); 1496 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring; 1497 1498 netif_stop_queue(netdev); 1499 /* Herbert's original patch had: 1500 * smp_mb__after_netif_stop_queue(); 1501 * but since that doesn't exist yet, just open code it. */ 1502 smp_mb(); 1503 1504 /* We need to check again in a case another CPU has just 1505 * made room available. */ 1506 if (likely(IXGB_DESC_UNUSED(tx_ring) < size)) 1507 return -EBUSY; 1508 1509 /* A reprieve! */ 1510 netif_start_queue(netdev); 1511 ++adapter->restart_queue; 1512 return 0; 1513} 1514 1515static int ixgb_maybe_stop_tx(struct net_device *netdev, 1516 struct ixgb_desc_ring *tx_ring, int size) 1517{ 1518 if (likely(IXGB_DESC_UNUSED(tx_ring) >= size)) 1519 return 0; 1520 return __ixgb_maybe_stop_tx(netdev, size); 1521} 1522 1523 1524/* Tx Descriptors needed, worst case */ 1525#define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \ 1526 (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0)) 1527#define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) /* skb->date */ + \ 1528 MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 /* for context */ \ 1529 + 1 /* one more needed for sentinel TSO workaround */ 1530 1531static netdev_tx_t 1532ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev) 1533{ 1534 struct ixgb_adapter *adapter = netdev_priv(netdev); 1535 unsigned int first; 1536 unsigned int tx_flags = 0; 1537 int vlan_id = 0; 1538 int count = 0; 1539 int tso; 1540 1541 if (test_bit(__IXGB_DOWN, &adapter->flags)) { 1542 dev_kfree_skb(skb); 1543 return NETDEV_TX_OK; 1544 } 1545 1546 if (skb->len <= 0) { 1547 dev_kfree_skb(skb); 1548 return NETDEV_TX_OK; 1549 } 1550 1551 if (unlikely(ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, 1552 DESC_NEEDED))) 1553 return NETDEV_TX_BUSY; 1554 1555 if (vlan_tx_tag_present(skb)) { 1556 tx_flags |= IXGB_TX_FLAGS_VLAN; 1557 vlan_id = vlan_tx_tag_get(skb); 1558 } 1559 1560 first = adapter->tx_ring.next_to_use; 1561 1562 tso = ixgb_tso(adapter, skb); 1563 if (tso < 0) { 1564 dev_kfree_skb(skb); 1565 return NETDEV_TX_OK; 1566 } 1567 1568 if (likely(tso)) 1569 tx_flags |= IXGB_TX_FLAGS_TSO; 1570 else if (ixgb_tx_csum(adapter, skb)) 1571 tx_flags |= IXGB_TX_FLAGS_CSUM; 1572 1573 count = ixgb_tx_map(adapter, skb, first); 1574 1575 if (count) { 1576 ixgb_tx_queue(adapter, count, vlan_id, tx_flags); 1577 /* Make sure there is space in the ring for the next send. */ 1578 ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED); 1579 1580 } else { 1581 dev_kfree_skb_any(skb); 1582 adapter->tx_ring.buffer_info[first].time_stamp = 0; 1583 adapter->tx_ring.next_to_use = first; 1584 } 1585 1586 return NETDEV_TX_OK; 1587} 1588 1589/** 1590 * ixgb_tx_timeout - Respond to a Tx Hang 1591 * @netdev: network interface device structure 1592 **/ 1593 1594static void 1595ixgb_tx_timeout(struct net_device *netdev) 1596{ 1597 struct ixgb_adapter *adapter = netdev_priv(netdev); 1598 1599 /* Do the reset outside of interrupt context */ 1600 schedule_work(&adapter->tx_timeout_task); 1601} 1602 1603static void 1604ixgb_tx_timeout_task(struct work_struct *work) 1605{ 1606 struct ixgb_adapter *adapter = 1607 container_of(work, struct ixgb_adapter, tx_timeout_task); 1608 1609 adapter->tx_timeout_count++; 1610 ixgb_down(adapter, true); 1611 ixgb_up(adapter); 1612} 1613 1614/** 1615 * ixgb_get_stats - Get System Network Statistics 1616 * @netdev: network interface device structure 1617 * 1618 * Returns the address of the device statistics structure. 1619 * The statistics are actually updated from the timer callback. 1620 **/ 1621 1622static struct net_device_stats * 1623ixgb_get_stats(struct net_device *netdev) 1624{ 1625 return &netdev->stats; 1626} 1627 1628/** 1629 * ixgb_change_mtu - Change the Maximum Transfer Unit 1630 * @netdev: network interface device structure 1631 * @new_mtu: new value for maximum frame size 1632 * 1633 * Returns 0 on success, negative on failure 1634 **/ 1635 1636static int 1637ixgb_change_mtu(struct net_device *netdev, int new_mtu) 1638{ 1639 struct ixgb_adapter *adapter = netdev_priv(netdev); 1640 int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH; 1641 int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH; 1642 1643 /* MTU < 68 is an error for IPv4 traffic, just don't allow it */ 1644 if ((new_mtu < 68) || 1645 (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) { 1646 netif_err(adapter, probe, adapter->netdev, 1647 "Invalid MTU setting %d\n", new_mtu); 1648 return -EINVAL; 1649 } 1650 1651 if (old_max_frame == max_frame) 1652 return 0; 1653 1654 if (netif_running(netdev)) 1655 ixgb_down(adapter, true); 1656 1657 adapter->rx_buffer_len = max_frame + 8; /* + 8 for errata */ 1658 1659 netdev->mtu = new_mtu; 1660 1661 if (netif_running(netdev)) 1662 ixgb_up(adapter); 1663 1664 return 0; 1665} 1666 1667/** 1668 * ixgb_update_stats - Update the board statistics counters. 1669 * @adapter: board private structure 1670 **/ 1671 1672void 1673ixgb_update_stats(struct ixgb_adapter *adapter) 1674{ 1675 struct net_device *netdev = adapter->netdev; 1676 struct pci_dev *pdev = adapter->pdev; 1677 1678 /* Prevent stats update while adapter is being reset */ 1679 if (pci_channel_offline(pdev)) 1680 return; 1681 1682 if ((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) || 1683 (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) { 1684 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL); 1685 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL); 1686 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH); 1687 u64 bcast = ((u64)bcast_h << 32) | bcast_l; 1688 1689 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32); 1690 /* fix up multicast stats by removing broadcasts */ 1691 if (multi >= bcast) 1692 multi -= bcast; 1693 1694 adapter->stats.mprcl += (multi & 0xFFFFFFFF); 1695 adapter->stats.mprch += (multi >> 32); 1696 adapter->stats.bprcl += bcast_l; 1697 adapter->stats.bprch += bcast_h; 1698 } else { 1699 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL); 1700 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH); 1701 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL); 1702 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH); 1703 } 1704 adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL); 1705 adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH); 1706 adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL); 1707 adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH); 1708 adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL); 1709 adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH); 1710 adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL); 1711 adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH); 1712 adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL); 1713 adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH); 1714 adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL); 1715 adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH); 1716 adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL); 1717 adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH); 1718 adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC); 1719 adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC); 1720 adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC); 1721 adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC); 1722 adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS); 1723 adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC); 1724 adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC); 1725 adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC); 1726 adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL); 1727 adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH); 1728 adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL); 1729 adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH); 1730 adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL); 1731 adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH); 1732 adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL); 1733 adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH); 1734 adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL); 1735 adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH); 1736 adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL); 1737 adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH); 1738 adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL); 1739 adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH); 1740 adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL); 1741 adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH); 1742 adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL); 1743 adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH); 1744 adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC); 1745 adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C); 1746 adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC); 1747 adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC); 1748 adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC); 1749 adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC); 1750 adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC); 1751 adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC); 1752 adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC); 1753 adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC); 1754 adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC); 1755 adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC); 1756 adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC); 1757 adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC); 1758 adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC); 1759 adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC); 1760 1761 /* Fill out the OS statistics structure */ 1762 1763 netdev->stats.rx_packets = adapter->stats.gprcl; 1764 netdev->stats.tx_packets = adapter->stats.gptcl; 1765 netdev->stats.rx_bytes = adapter->stats.gorcl; 1766 netdev->stats.tx_bytes = adapter->stats.gotcl; 1767 netdev->stats.multicast = adapter->stats.mprcl; 1768 netdev->stats.collisions = 0; 1769 1770 /* ignore RLEC as it reports errors for padded (<64bytes) frames 1771 * with a length in the type/len field */ 1772 netdev->stats.rx_errors = 1773 /* adapter->stats.rnbc + */ adapter->stats.crcerrs + 1774 adapter->stats.ruc + 1775 adapter->stats.roc /*+ adapter->stats.rlec */ + 1776 adapter->stats.icbc + 1777 adapter->stats.ecbc + adapter->stats.mpc; 1778 1779 /* see above 1780 * netdev->stats.rx_length_errors = adapter->stats.rlec; 1781 */ 1782 1783 netdev->stats.rx_crc_errors = adapter->stats.crcerrs; 1784 netdev->stats.rx_fifo_errors = adapter->stats.mpc; 1785 netdev->stats.rx_missed_errors = adapter->stats.mpc; 1786 netdev->stats.rx_over_errors = adapter->stats.mpc; 1787 1788 netdev->stats.tx_errors = 0; 1789 netdev->stats.rx_frame_errors = 0; 1790 netdev->stats.tx_aborted_errors = 0; 1791 netdev->stats.tx_carrier_errors = 0; 1792 netdev->stats.tx_fifo_errors = 0; 1793 netdev->stats.tx_heartbeat_errors = 0; 1794 netdev->stats.tx_window_errors = 0; 1795} 1796 1797#define IXGB_MAX_INTR 10 1798/** 1799 * ixgb_intr - Interrupt Handler 1800 * @irq: interrupt number 1801 * @data: pointer to a network interface device structure 1802 **/ 1803 1804static irqreturn_t 1805ixgb_intr(int irq, void *data) 1806{ 1807 struct net_device *netdev = data; 1808 struct ixgb_adapter *adapter = netdev_priv(netdev); 1809 struct ixgb_hw *hw = &adapter->hw; 1810 u32 icr = IXGB_READ_REG(hw, ICR); 1811 1812 if (unlikely(!icr)) 1813 return IRQ_NONE; /* Not our interrupt */ 1814 1815 if (unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC))) 1816 if (!test_bit(__IXGB_DOWN, &adapter->flags)) 1817 mod_timer(&adapter->watchdog_timer, jiffies); 1818 1819 if (napi_schedule_prep(&adapter->napi)) { 1820 1821 /* Disable interrupts and register for poll. The flush 1822 of the posted write is intentionally left out. 1823 */ 1824 1825 IXGB_WRITE_REG(&adapter->hw, IMC, ~0); 1826 __napi_schedule(&adapter->napi); 1827 } 1828 return IRQ_HANDLED; 1829} 1830 1831/** 1832 * ixgb_clean - NAPI Rx polling callback 1833 * @adapter: board private structure 1834 **/ 1835 1836static int 1837ixgb_clean(struct napi_struct *napi, int budget) 1838{ 1839 struct ixgb_adapter *adapter = container_of(napi, struct ixgb_adapter, napi); 1840 int work_done = 0; 1841 1842 ixgb_clean_tx_irq(adapter); 1843 ixgb_clean_rx_irq(adapter, &work_done, budget); 1844 1845 /* If budget not fully consumed, exit the polling mode */ 1846 if (work_done < budget) { 1847 napi_complete(napi); 1848 if (!test_bit(__IXGB_DOWN, &adapter->flags)) 1849 ixgb_irq_enable(adapter); 1850 } 1851 1852 return work_done; 1853} 1854 1855/** 1856 * ixgb_clean_tx_irq - Reclaim resources after transmit completes 1857 * @adapter: board private structure 1858 **/ 1859 1860static bool 1861ixgb_clean_tx_irq(struct ixgb_adapter *adapter) 1862{ 1863 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring; 1864 struct net_device *netdev = adapter->netdev; 1865 struct ixgb_tx_desc *tx_desc, *eop_desc; 1866 struct ixgb_buffer *buffer_info; 1867 unsigned int i, eop; 1868 bool cleaned = false; 1869 1870 i = tx_ring->next_to_clean; 1871 eop = tx_ring->buffer_info[i].next_to_watch; 1872 eop_desc = IXGB_TX_DESC(*tx_ring, eop); 1873 1874 while (eop_desc->status & IXGB_TX_DESC_STATUS_DD) { 1875 1876 rmb(); /* read buffer_info after eop_desc */ 1877 for (cleaned = false; !cleaned; ) { 1878 tx_desc = IXGB_TX_DESC(*tx_ring, i); 1879 buffer_info = &tx_ring->buffer_info[i]; 1880 1881 if (tx_desc->popts & 1882 (IXGB_TX_DESC_POPTS_TXSM | 1883 IXGB_TX_DESC_POPTS_IXSM)) 1884 adapter->hw_csum_tx_good++; 1885 1886 ixgb_unmap_and_free_tx_resource(adapter, buffer_info); 1887 1888 *(u32 *)&(tx_desc->status) = 0; 1889 1890 cleaned = (i == eop); 1891 if (++i == tx_ring->count) i = 0; 1892 } 1893 1894 eop = tx_ring->buffer_info[i].next_to_watch; 1895 eop_desc = IXGB_TX_DESC(*tx_ring, eop); 1896 } 1897 1898 tx_ring->next_to_clean = i; 1899 1900 if (unlikely(cleaned && netif_carrier_ok(netdev) && 1901 IXGB_DESC_UNUSED(tx_ring) >= DESC_NEEDED)) { 1902 /* Make sure that anybody stopping the queue after this 1903 * sees the new next_to_clean. */ 1904 smp_mb(); 1905 1906 if (netif_queue_stopped(netdev) && 1907 !(test_bit(__IXGB_DOWN, &adapter->flags))) { 1908 netif_wake_queue(netdev); 1909 ++adapter->restart_queue; 1910 } 1911 } 1912 1913 if (adapter->detect_tx_hung) { 1914 /* detect a transmit hang in hardware, this serializes the 1915 * check with the clearing of time_stamp and movement of i */ 1916 adapter->detect_tx_hung = false; 1917 if (tx_ring->buffer_info[eop].time_stamp && 1918 time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ) 1919 && !(IXGB_READ_REG(&adapter->hw, STATUS) & 1920 IXGB_STATUS_TXOFF)) { 1921 /* detected Tx unit hang */ 1922 netif_err(adapter, drv, adapter->netdev, 1923 "Detected Tx Unit Hang\n" 1924 " TDH <%x>\n" 1925 " TDT <%x>\n" 1926 " next_to_use <%x>\n" 1927 " next_to_clean <%x>\n" 1928 "buffer_info[next_to_clean]\n" 1929 " time_stamp <%lx>\n" 1930 " next_to_watch <%x>\n" 1931 " jiffies <%lx>\n" 1932 " next_to_watch.status <%x>\n", 1933 IXGB_READ_REG(&adapter->hw, TDH), 1934 IXGB_READ_REG(&adapter->hw, TDT), 1935 tx_ring->next_to_use, 1936 tx_ring->next_to_clean, 1937 tx_ring->buffer_info[eop].time_stamp, 1938 eop, 1939 jiffies, 1940 eop_desc->status); 1941 netif_stop_queue(netdev); 1942 } 1943 } 1944 1945 return cleaned; 1946} 1947 1948/** 1949 * ixgb_rx_checksum - Receive Checksum Offload for 82597. 1950 * @adapter: board private structure 1951 * @rx_desc: receive descriptor 1952 * @sk_buff: socket buffer with received data 1953 **/ 1954 1955static void 1956ixgb_rx_checksum(struct ixgb_adapter *adapter, 1957 struct ixgb_rx_desc *rx_desc, 1958 struct sk_buff *skb) 1959{ 1960 /* Ignore Checksum bit is set OR 1961 * TCP Checksum has not been calculated 1962 */ 1963 if ((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) || 1964 (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) { 1965 skb_checksum_none_assert(skb); 1966 return; 1967 } 1968 1969 /* At this point we know the hardware did the TCP checksum */ 1970 /* now look at the TCP checksum error bit */ 1971 if (rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) { 1972 /* let the stack verify checksum errors */ 1973 skb_checksum_none_assert(skb); 1974 adapter->hw_csum_rx_error++; 1975 } else { 1976 /* TCP checksum is good */ 1977 skb->ip_summed = CHECKSUM_UNNECESSARY; 1978 adapter->hw_csum_rx_good++; 1979 } 1980} 1981 1982/* 1983 * this should improve performance for small packets with large amounts 1984 * of reassembly being done in the stack 1985 */ 1986static void ixgb_check_copybreak(struct net_device *netdev, 1987 struct ixgb_buffer *buffer_info, 1988 u32 length, struct sk_buff **skb) 1989{ 1990 struct sk_buff *new_skb; 1991 1992 if (length > copybreak) 1993 return; 1994 1995 new_skb = netdev_alloc_skb_ip_align(netdev, length); 1996 if (!new_skb) 1997 return; 1998 1999 skb_copy_to_linear_data_offset(new_skb, -NET_IP_ALIGN, 2000 (*skb)->data - NET_IP_ALIGN, 2001 length + NET_IP_ALIGN); 2002 /* save the skb in buffer_info as good */ 2003 buffer_info->skb = *skb; 2004 *skb = new_skb; 2005} 2006 2007/** 2008 * ixgb_clean_rx_irq - Send received data up the network stack, 2009 * @adapter: board private structure 2010 **/ 2011 2012static bool 2013ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do) 2014{ 2015 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring; 2016 struct net_device *netdev = adapter->netdev; 2017 struct pci_dev *pdev = adapter->pdev; 2018 struct ixgb_rx_desc *rx_desc, *next_rxd; 2019 struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer; 2020 u32 length; 2021 unsigned int i, j; 2022 int cleaned_count = 0; 2023 bool cleaned = false; 2024 2025 i = rx_ring->next_to_clean; 2026 rx_desc = IXGB_RX_DESC(*rx_ring, i); 2027 buffer_info = &rx_ring->buffer_info[i]; 2028 2029 while (rx_desc->status & IXGB_RX_DESC_STATUS_DD) { 2030 struct sk_buff *skb; 2031 u8 status; 2032 2033 if (*work_done >= work_to_do) 2034 break; 2035 2036 (*work_done)++; 2037 rmb(); /* read descriptor and rx_buffer_info after status DD */ 2038 status = rx_desc->status; 2039 skb = buffer_info->skb; 2040 buffer_info->skb = NULL; 2041 2042 prefetch(skb->data - NET_IP_ALIGN); 2043 2044 if (++i == rx_ring->count) 2045 i = 0; 2046 next_rxd = IXGB_RX_DESC(*rx_ring, i); 2047 prefetch(next_rxd); 2048 2049 j = i + 1; 2050 if (j == rx_ring->count) 2051 j = 0; 2052 next2_buffer = &rx_ring->buffer_info[j]; 2053 prefetch(next2_buffer); 2054 2055 next_buffer = &rx_ring->buffer_info[i]; 2056 2057 cleaned = true; 2058 cleaned_count++; 2059 2060 dma_unmap_single(&pdev->dev, 2061 buffer_info->dma, 2062 buffer_info->length, 2063 DMA_FROM_DEVICE); 2064 buffer_info->dma = 0; 2065 2066 length = le16_to_cpu(rx_desc->length); 2067 rx_desc->length = 0; 2068 2069 if (unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) { 2070 2071 /* All receives must fit into a single buffer */ 2072 2073 IXGB_DBG("Receive packet consumed multiple buffers " 2074 "length<%x>\n", length); 2075 2076 dev_kfree_skb_irq(skb); 2077 goto rxdesc_done; 2078 } 2079 2080 if (unlikely(rx_desc->errors & 2081 (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE | 2082 IXGB_RX_DESC_ERRORS_P | IXGB_RX_DESC_ERRORS_RXE))) { 2083 dev_kfree_skb_irq(skb); 2084 goto rxdesc_done; 2085 } 2086 2087 ixgb_check_copybreak(netdev, buffer_info, length, &skb); 2088 2089 /* Good Receive */ 2090 skb_put(skb, length); 2091 2092 /* Receive Checksum Offload */ 2093 ixgb_rx_checksum(adapter, rx_desc, skb); 2094 2095 skb->protocol = eth_type_trans(skb, netdev); 2096 if (status & IXGB_RX_DESC_STATUS_VP) 2097 __vlan_hwaccel_put_tag(skb, 2098 le16_to_cpu(rx_desc->special)); 2099 2100 netif_receive_skb(skb); 2101 2102rxdesc_done: 2103 /* clean up descriptor, might be written over by hw */ 2104 rx_desc->status = 0; 2105 2106 /* return some buffers to hardware, one at a time is too slow */ 2107 if (unlikely(cleaned_count >= IXGB_RX_BUFFER_WRITE)) { 2108 ixgb_alloc_rx_buffers(adapter, cleaned_count); 2109 cleaned_count = 0; 2110 } 2111 2112 /* use prefetched values */ 2113 rx_desc = next_rxd; 2114 buffer_info = next_buffer; 2115 } 2116 2117 rx_ring->next_to_clean = i; 2118 2119 cleaned_count = IXGB_DESC_UNUSED(rx_ring); 2120 if (cleaned_count) 2121 ixgb_alloc_rx_buffers(adapter, cleaned_count); 2122 2123 return cleaned; 2124} 2125 2126/** 2127 * ixgb_alloc_rx_buffers - Replace used receive buffers 2128 * @adapter: address of board private structure 2129 **/ 2130 2131static void 2132ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter, int cleaned_count) 2133{ 2134 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring; 2135 struct net_device *netdev = adapter->netdev; 2136 struct pci_dev *pdev = adapter->pdev; 2137 struct ixgb_rx_desc *rx_desc; 2138 struct ixgb_buffer *buffer_info; 2139 struct sk_buff *skb; 2140 unsigned int i; 2141 long cleancount; 2142 2143 i = rx_ring->next_to_use; 2144 buffer_info = &rx_ring->buffer_info[i]; 2145 cleancount = IXGB_DESC_UNUSED(rx_ring); 2146 2147 2148 /* leave three descriptors unused */ 2149 while (--cleancount > 2 && cleaned_count--) { 2150 /* recycle! its good for you */ 2151 skb = buffer_info->skb; 2152 if (skb) { 2153 skb_trim(skb, 0); 2154 goto map_skb; 2155 } 2156 2157 skb = netdev_alloc_skb_ip_align(netdev, adapter->rx_buffer_len); 2158 if (unlikely(!skb)) { 2159 /* Better luck next round */ 2160 adapter->alloc_rx_buff_failed++; 2161 break; 2162 } 2163 2164 buffer_info->skb = skb; 2165 buffer_info->length = adapter->rx_buffer_len; 2166map_skb: 2167 buffer_info->dma = dma_map_single(&pdev->dev, 2168 skb->data, 2169 adapter->rx_buffer_len, 2170 DMA_FROM_DEVICE); 2171 2172 rx_desc = IXGB_RX_DESC(*rx_ring, i); 2173 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma); 2174 /* guarantee DD bit not set now before h/w gets descriptor 2175 * this is the rest of the workaround for h/w double 2176 * writeback. */ 2177 rx_desc->status = 0; 2178 2179 2180 if (++i == rx_ring->count) i = 0; 2181 buffer_info = &rx_ring->buffer_info[i]; 2182 } 2183 2184 if (likely(rx_ring->next_to_use != i)) { 2185 rx_ring->next_to_use = i; 2186 if (unlikely(i-- == 0)) 2187 i = (rx_ring->count - 1); 2188 2189 /* Force memory writes to complete before letting h/w 2190 * know there are new descriptors to fetch. (Only 2191 * applicable for weak-ordered memory model archs, such 2192 * as IA-64). */ 2193 wmb(); 2194 IXGB_WRITE_REG(&adapter->hw, RDT, i); 2195 } 2196} 2197 2198static void 2199ixgb_vlan_strip_enable(struct ixgb_adapter *adapter) 2200{ 2201 u32 ctrl; 2202 2203 /* enable VLAN tag insert/strip */ 2204 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0); 2205 ctrl |= IXGB_CTRL0_VME; 2206 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl); 2207} 2208 2209static void 2210ixgb_vlan_strip_disable(struct ixgb_adapter *adapter) 2211{ 2212 u32 ctrl; 2213 2214 /* disable VLAN tag insert/strip */ 2215 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0); 2216 ctrl &= ~IXGB_CTRL0_VME; 2217 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl); 2218} 2219 2220static void 2221ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid) 2222{ 2223 struct ixgb_adapter *adapter = netdev_priv(netdev); 2224 u32 vfta, index; 2225 2226 /* add VID to filter table */ 2227 2228 index = (vid >> 5) & 0x7F; 2229 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index); 2230 vfta |= (1 << (vid & 0x1F)); 2231 ixgb_write_vfta(&adapter->hw, index, vfta); 2232 set_bit(vid, adapter->active_vlans); 2233} 2234 2235static void 2236ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid) 2237{ 2238 struct ixgb_adapter *adapter = netdev_priv(netdev); 2239 u32 vfta, index; 2240 2241 /* remove VID from filter table */ 2242 2243 index = (vid >> 5) & 0x7F; 2244 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index); 2245 vfta &= ~(1 << (vid & 0x1F)); 2246 ixgb_write_vfta(&adapter->hw, index, vfta); 2247 clear_bit(vid, adapter->active_vlans); 2248} 2249 2250static void 2251ixgb_restore_vlan(struct ixgb_adapter *adapter) 2252{ 2253 u16 vid; 2254 2255 for_each_set_bit(vid, adapter->active_vlans, VLAN_N_VID) 2256 ixgb_vlan_rx_add_vid(adapter->netdev, vid); 2257} 2258 2259#ifdef CONFIG_NET_POLL_CONTROLLER 2260/* 2261 * Polling 'interrupt' - used by things like netconsole to send skbs 2262 * without having to re-enable interrupts. It's not called while 2263 * the interrupt routine is executing. 2264 */ 2265 2266static void ixgb_netpoll(struct net_device *dev) 2267{ 2268 struct ixgb_adapter *adapter = netdev_priv(dev); 2269 2270 disable_irq(adapter->pdev->irq); 2271 ixgb_intr(adapter->pdev->irq, dev); 2272 enable_irq(adapter->pdev->irq); 2273} 2274#endif 2275 2276/** 2277 * ixgb_io_error_detected() - called when PCI error is detected 2278 * @pdev pointer to pci device with error 2279 * @state pci channel state after error 2280 * 2281 * This callback is called by the PCI subsystem whenever 2282 * a PCI bus error is detected. 2283 */ 2284static pci_ers_result_t ixgb_io_error_detected(struct pci_dev *pdev, 2285 enum pci_channel_state state) 2286{ 2287 struct net_device *netdev = pci_get_drvdata(pdev); 2288 struct ixgb_adapter *adapter = netdev_priv(netdev); 2289 2290 netif_device_detach(netdev); 2291 2292 if (state == pci_channel_io_perm_failure) 2293 return PCI_ERS_RESULT_DISCONNECT; 2294 2295 if (netif_running(netdev)) 2296 ixgb_down(adapter, true); 2297 2298 pci_disable_device(pdev); 2299 2300 /* Request a slot reset. */ 2301 return PCI_ERS_RESULT_NEED_RESET; 2302} 2303 2304/** 2305 * ixgb_io_slot_reset - called after the pci bus has been reset. 2306 * @pdev pointer to pci device with error 2307 * 2308 * This callback is called after the PCI bus has been reset. 2309 * Basically, this tries to restart the card from scratch. 2310 * This is a shortened version of the device probe/discovery code, 2311 * it resembles the first-half of the ixgb_probe() routine. 2312 */ 2313static pci_ers_result_t ixgb_io_slot_reset(struct pci_dev *pdev) 2314{ 2315 struct net_device *netdev = pci_get_drvdata(pdev); 2316 struct ixgb_adapter *adapter = netdev_priv(netdev); 2317 2318 if (pci_enable_device(pdev)) { 2319 netif_err(adapter, probe, adapter->netdev, 2320 "Cannot re-enable PCI device after reset\n"); 2321 return PCI_ERS_RESULT_DISCONNECT; 2322 } 2323 2324 /* Perform card reset only on one instance of the card */ 2325 if (0 != PCI_FUNC (pdev->devfn)) 2326 return PCI_ERS_RESULT_RECOVERED; 2327 2328 pci_set_master(pdev); 2329 2330 netif_carrier_off(netdev); 2331 netif_stop_queue(netdev); 2332 ixgb_reset(adapter); 2333 2334 /* Make sure the EEPROM is good */ 2335 if (!ixgb_validate_eeprom_checksum(&adapter->hw)) { 2336 netif_err(adapter, probe, adapter->netdev, 2337 "After reset, the EEPROM checksum is not valid\n"); 2338 return PCI_ERS_RESULT_DISCONNECT; 2339 } 2340 ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr); 2341 memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len); 2342 2343 if (!is_valid_ether_addr(netdev->perm_addr)) { 2344 netif_err(adapter, probe, adapter->netdev, 2345 "After reset, invalid MAC address\n"); 2346 return PCI_ERS_RESULT_DISCONNECT; 2347 } 2348 2349 return PCI_ERS_RESULT_RECOVERED; 2350} 2351 2352/** 2353 * ixgb_io_resume - called when its OK to resume normal operations 2354 * @pdev pointer to pci device with error 2355 * 2356 * The error recovery driver tells us that its OK to resume 2357 * normal operation. Implementation resembles the second-half 2358 * of the ixgb_probe() routine. 2359 */ 2360static void ixgb_io_resume(struct pci_dev *pdev) 2361{ 2362 struct net_device *netdev = pci_get_drvdata(pdev); 2363 struct ixgb_adapter *adapter = netdev_priv(netdev); 2364 2365 pci_set_master(pdev); 2366 2367 if (netif_running(netdev)) { 2368 if (ixgb_up(adapter)) { 2369 pr_err("can't bring device back up after reset\n"); 2370 return; 2371 } 2372 } 2373 2374 netif_device_attach(netdev); 2375 mod_timer(&adapter->watchdog_timer, jiffies); 2376} 2377 2378/* ixgb_main.c */ 2379