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 const struct pci_device_id 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, 105 __be16 proto, u16 vid); 106static int ixgb_vlan_rx_kill_vid(struct net_device *netdev, 107 __be16 proto, u16 vid); 108static void ixgb_restore_vlan(struct ixgb_adapter *adapter); 109 110#ifdef CONFIG_NET_POLL_CONTROLLER 111/* for netdump / net console */ 112static void ixgb_netpoll(struct net_device *dev); 113#endif 114 115static pci_ers_result_t ixgb_io_error_detected (struct pci_dev *pdev, 116 enum pci_channel_state state); 117static pci_ers_result_t ixgb_io_slot_reset (struct pci_dev *pdev); 118static void ixgb_io_resume (struct pci_dev *pdev); 119 120static const struct pci_error_handlers ixgb_err_handler = { 121 .error_detected = ixgb_io_error_detected, 122 .slot_reset = ixgb_io_slot_reset, 123 .resume = ixgb_io_resume, 124}; 125 126static struct pci_driver ixgb_driver = { 127 .name = ixgb_driver_name, 128 .id_table = ixgb_pci_tbl, 129 .probe = ixgb_probe, 130 .remove = ixgb_remove, 131 .err_handler = &ixgb_err_handler 132}; 133 134MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>"); 135MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver"); 136MODULE_LICENSE("GPL"); 137MODULE_VERSION(DRV_VERSION); 138 139#define DEFAULT_MSG_ENABLE (NETIF_MSG_DRV|NETIF_MSG_PROBE|NETIF_MSG_LINK) 140static int debug = -1; 141module_param(debug, int, 0); 142MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)"); 143 144/** 145 * ixgb_init_module - Driver Registration Routine 146 * 147 * ixgb_init_module is the first routine called when the driver is 148 * loaded. All it does is register with the PCI subsystem. 149 **/ 150 151static int __init 152ixgb_init_module(void) 153{ 154 pr_info("%s - version %s\n", ixgb_driver_string, ixgb_driver_version); 155 pr_info("%s\n", ixgb_copyright); 156 157 return pci_register_driver(&ixgb_driver); 158} 159 160module_init(ixgb_init_module); 161 162/** 163 * ixgb_exit_module - Driver Exit Cleanup Routine 164 * 165 * ixgb_exit_module is called just before the driver is removed 166 * from memory. 167 **/ 168 169static void __exit 170ixgb_exit_module(void) 171{ 172 pci_unregister_driver(&ixgb_driver); 173} 174 175module_exit(ixgb_exit_module); 176 177/** 178 * ixgb_irq_disable - Mask off interrupt generation on the NIC 179 * @adapter: board private structure 180 **/ 181 182static void 183ixgb_irq_disable(struct ixgb_adapter *adapter) 184{ 185 IXGB_WRITE_REG(&adapter->hw, IMC, ~0); 186 IXGB_WRITE_FLUSH(&adapter->hw); 187 synchronize_irq(adapter->pdev->irq); 188} 189 190/** 191 * ixgb_irq_enable - Enable default interrupt generation settings 192 * @adapter: board private structure 193 **/ 194 195static void 196ixgb_irq_enable(struct ixgb_adapter *adapter) 197{ 198 u32 val = IXGB_INT_RXT0 | IXGB_INT_RXDMT0 | 199 IXGB_INT_TXDW | IXGB_INT_LSC; 200 if (adapter->hw.subsystem_vendor_id == PCI_VENDOR_ID_SUN) 201 val |= IXGB_INT_GPI0; 202 IXGB_WRITE_REG(&adapter->hw, IMS, val); 203 IXGB_WRITE_FLUSH(&adapter->hw); 204} 205 206int 207ixgb_up(struct ixgb_adapter *adapter) 208{ 209 struct net_device *netdev = adapter->netdev; 210 int err, irq_flags = IRQF_SHARED; 211 int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH; 212 struct ixgb_hw *hw = &adapter->hw; 213 214 /* hardware has been reset, we need to reload some things */ 215 216 ixgb_rar_set(hw, netdev->dev_addr, 0); 217 ixgb_set_multi(netdev); 218 219 ixgb_restore_vlan(adapter); 220 221 ixgb_configure_tx(adapter); 222 ixgb_setup_rctl(adapter); 223 ixgb_configure_rx(adapter); 224 ixgb_alloc_rx_buffers(adapter, IXGB_DESC_UNUSED(&adapter->rx_ring)); 225 226 /* disable interrupts and get the hardware into a known state */ 227 IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff); 228 229 /* only enable MSI if bus is in PCI-X mode */ 230 if (IXGB_READ_REG(&adapter->hw, STATUS) & IXGB_STATUS_PCIX_MODE) { 231 err = pci_enable_msi(adapter->pdev); 232 if (!err) { 233 adapter->have_msi = true; 234 irq_flags = 0; 235 } 236 /* proceed to try to request regular interrupt */ 237 } 238 239 err = request_irq(adapter->pdev->irq, ixgb_intr, irq_flags, 240 netdev->name, netdev); 241 if (err) { 242 if (adapter->have_msi) 243 pci_disable_msi(adapter->pdev); 244 netif_err(adapter, probe, adapter->netdev, 245 "Unable to allocate interrupt Error: %d\n", err); 246 return err; 247 } 248 249 if ((hw->max_frame_size != max_frame) || 250 (hw->max_frame_size != 251 (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) { 252 253 hw->max_frame_size = max_frame; 254 255 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT); 256 257 if (hw->max_frame_size > 258 IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) { 259 u32 ctrl0 = IXGB_READ_REG(hw, CTRL0); 260 261 if (!(ctrl0 & IXGB_CTRL0_JFE)) { 262 ctrl0 |= IXGB_CTRL0_JFE; 263 IXGB_WRITE_REG(hw, CTRL0, ctrl0); 264 } 265 } 266 } 267 268 clear_bit(__IXGB_DOWN, &adapter->flags); 269 270 napi_enable(&adapter->napi); 271 ixgb_irq_enable(adapter); 272 273 netif_wake_queue(netdev); 274 275 mod_timer(&adapter->watchdog_timer, jiffies); 276 277 return 0; 278} 279 280void 281ixgb_down(struct ixgb_adapter *adapter, bool kill_watchdog) 282{ 283 struct net_device *netdev = adapter->netdev; 284 285 /* prevent the interrupt handler from restarting watchdog */ 286 set_bit(__IXGB_DOWN, &adapter->flags); 287 288 netif_carrier_off(netdev); 289 290 napi_disable(&adapter->napi); 291 /* waiting for NAPI to complete can re-enable interrupts */ 292 ixgb_irq_disable(adapter); 293 free_irq(adapter->pdev->irq, netdev); 294 295 if (adapter->have_msi) 296 pci_disable_msi(adapter->pdev); 297 298 if (kill_watchdog) 299 del_timer_sync(&adapter->watchdog_timer); 300 301 adapter->link_speed = 0; 302 adapter->link_duplex = 0; 303 netif_stop_queue(netdev); 304 305 ixgb_reset(adapter); 306 ixgb_clean_tx_ring(adapter); 307 ixgb_clean_rx_ring(adapter); 308} 309 310void 311ixgb_reset(struct ixgb_adapter *adapter) 312{ 313 struct ixgb_hw *hw = &adapter->hw; 314 315 ixgb_adapter_stop(hw); 316 if (!ixgb_init_hw(hw)) 317 netif_err(adapter, probe, adapter->netdev, "ixgb_init_hw failed\n"); 318 319 /* restore frame size information */ 320 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT); 321 if (hw->max_frame_size > 322 IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) { 323 u32 ctrl0 = IXGB_READ_REG(hw, CTRL0); 324 if (!(ctrl0 & IXGB_CTRL0_JFE)) { 325 ctrl0 |= IXGB_CTRL0_JFE; 326 IXGB_WRITE_REG(hw, CTRL0, ctrl0); 327 } 328 } 329} 330 331static netdev_features_t 332ixgb_fix_features(struct net_device *netdev, netdev_features_t features) 333{ 334 /* 335 * Tx VLAN insertion does not work per HW design when Rx stripping is 336 * disabled. 337 */ 338 if (!(features & NETIF_F_HW_VLAN_CTAG_RX)) 339 features &= ~NETIF_F_HW_VLAN_CTAG_TX; 340 341 return features; 342} 343 344static int 345ixgb_set_features(struct net_device *netdev, netdev_features_t features) 346{ 347 struct ixgb_adapter *adapter = netdev_priv(netdev); 348 netdev_features_t changed = features ^ netdev->features; 349 350 if (!(changed & (NETIF_F_RXCSUM|NETIF_F_HW_VLAN_CTAG_RX))) 351 return 0; 352 353 adapter->rx_csum = !!(features & NETIF_F_RXCSUM); 354 355 if (netif_running(netdev)) { 356 ixgb_down(adapter, true); 357 ixgb_up(adapter); 358 ixgb_set_speed_duplex(netdev); 359 } else 360 ixgb_reset(adapter); 361 362 return 0; 363} 364 365 366static const struct net_device_ops ixgb_netdev_ops = { 367 .ndo_open = ixgb_open, 368 .ndo_stop = ixgb_close, 369 .ndo_start_xmit = ixgb_xmit_frame, 370 .ndo_get_stats = ixgb_get_stats, 371 .ndo_set_rx_mode = ixgb_set_multi, 372 .ndo_validate_addr = eth_validate_addr, 373 .ndo_set_mac_address = ixgb_set_mac, 374 .ndo_change_mtu = ixgb_change_mtu, 375 .ndo_tx_timeout = ixgb_tx_timeout, 376 .ndo_vlan_rx_add_vid = ixgb_vlan_rx_add_vid, 377 .ndo_vlan_rx_kill_vid = ixgb_vlan_rx_kill_vid, 378#ifdef CONFIG_NET_POLL_CONTROLLER 379 .ndo_poll_controller = ixgb_netpoll, 380#endif 381 .ndo_fix_features = ixgb_fix_features, 382 .ndo_set_features = ixgb_set_features, 383}; 384 385/** 386 * ixgb_probe - Device Initialization Routine 387 * @pdev: PCI device information struct 388 * @ent: entry in ixgb_pci_tbl 389 * 390 * Returns 0 on success, negative on failure 391 * 392 * ixgb_probe initializes an adapter identified by a pci_dev structure. 393 * The OS initialization, configuring of the adapter private structure, 394 * and a hardware reset occur. 395 **/ 396 397static int 398ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent) 399{ 400 struct net_device *netdev = NULL; 401 struct ixgb_adapter *adapter; 402 static int cards_found = 0; 403 int pci_using_dac; 404 int i; 405 int err; 406 407 err = pci_enable_device(pdev); 408 if (err) 409 return err; 410 411 pci_using_dac = 0; 412 err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64)); 413 if (!err) { 414 pci_using_dac = 1; 415 } else { 416 err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); 417 if (err) { 418 pr_err("No usable DMA configuration, aborting\n"); 419 goto err_dma_mask; 420 } 421 } 422 423 err = pci_request_regions(pdev, ixgb_driver_name); 424 if (err) 425 goto err_request_regions; 426 427 pci_set_master(pdev); 428 429 netdev = alloc_etherdev(sizeof(struct ixgb_adapter)); 430 if (!netdev) { 431 err = -ENOMEM; 432 goto err_alloc_etherdev; 433 } 434 435 SET_NETDEV_DEV(netdev, &pdev->dev); 436 437 pci_set_drvdata(pdev, netdev); 438 adapter = netdev_priv(netdev); 439 adapter->netdev = netdev; 440 adapter->pdev = pdev; 441 adapter->hw.back = adapter; 442 adapter->msg_enable = netif_msg_init(debug, DEFAULT_MSG_ENABLE); 443 444 adapter->hw.hw_addr = pci_ioremap_bar(pdev, BAR_0); 445 if (!adapter->hw.hw_addr) { 446 err = -EIO; 447 goto err_ioremap; 448 } 449 450 for (i = BAR_1; i <= BAR_5; i++) { 451 if (pci_resource_len(pdev, i) == 0) 452 continue; 453 if (pci_resource_flags(pdev, i) & IORESOURCE_IO) { 454 adapter->hw.io_base = pci_resource_start(pdev, i); 455 break; 456 } 457 } 458 459 netdev->netdev_ops = &ixgb_netdev_ops; 460 ixgb_set_ethtool_ops(netdev); 461 netdev->watchdog_timeo = 5 * HZ; 462 netif_napi_add(netdev, &adapter->napi, ixgb_clean, 64); 463 464 strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1); 465 466 adapter->bd_number = cards_found; 467 adapter->link_speed = 0; 468 adapter->link_duplex = 0; 469 470 /* setup the private structure */ 471 472 err = ixgb_sw_init(adapter); 473 if (err) 474 goto err_sw_init; 475 476 netdev->hw_features = NETIF_F_SG | 477 NETIF_F_TSO | 478 NETIF_F_HW_CSUM | 479 NETIF_F_HW_VLAN_CTAG_TX | 480 NETIF_F_HW_VLAN_CTAG_RX; 481 netdev->features = netdev->hw_features | 482 NETIF_F_HW_VLAN_CTAG_FILTER; 483 netdev->hw_features |= NETIF_F_RXCSUM; 484 485 if (pci_using_dac) { 486 netdev->features |= NETIF_F_HIGHDMA; 487 netdev->vlan_features |= NETIF_F_HIGHDMA; 488 } 489 490 /* make sure the EEPROM is good */ 491 492 if (!ixgb_validate_eeprom_checksum(&adapter->hw)) { 493 netif_err(adapter, probe, adapter->netdev, 494 "The EEPROM Checksum Is Not Valid\n"); 495 err = -EIO; 496 goto err_eeprom; 497 } 498 499 ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr); 500 501 if (!is_valid_ether_addr(netdev->dev_addr)) { 502 netif_err(adapter, probe, adapter->netdev, "Invalid MAC Address\n"); 503 err = -EIO; 504 goto err_eeprom; 505 } 506 507 adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw); 508 509 init_timer(&adapter->watchdog_timer); 510 adapter->watchdog_timer.function = ixgb_watchdog; 511 adapter->watchdog_timer.data = (unsigned long)adapter; 512 513 INIT_WORK(&adapter->tx_timeout_task, ixgb_tx_timeout_task); 514 515 strcpy(netdev->name, "eth%d"); 516 err = register_netdev(netdev); 517 if (err) 518 goto err_register; 519 520 /* carrier off reporting is important to ethtool even BEFORE open */ 521 netif_carrier_off(netdev); 522 523 netif_info(adapter, probe, adapter->netdev, 524 "Intel(R) PRO/10GbE Network Connection\n"); 525 ixgb_check_options(adapter); 526 /* reset the hardware with the new settings */ 527 528 ixgb_reset(adapter); 529 530 cards_found++; 531 return 0; 532 533err_register: 534err_sw_init: 535err_eeprom: 536 iounmap(adapter->hw.hw_addr); 537err_ioremap: 538 free_netdev(netdev); 539err_alloc_etherdev: 540 pci_release_regions(pdev); 541err_request_regions: 542err_dma_mask: 543 pci_disable_device(pdev); 544 return err; 545} 546 547/** 548 * ixgb_remove - Device Removal Routine 549 * @pdev: PCI device information struct 550 * 551 * ixgb_remove is called by the PCI subsystem to alert the driver 552 * that it should release a PCI device. The could be caused by a 553 * Hot-Plug event, or because the driver is going to be removed from 554 * memory. 555 **/ 556 557static void 558ixgb_remove(struct pci_dev *pdev) 559{ 560 struct net_device *netdev = pci_get_drvdata(pdev); 561 struct ixgb_adapter *adapter = netdev_priv(netdev); 562 563 cancel_work_sync(&adapter->tx_timeout_task); 564 565 unregister_netdev(netdev); 566 567 iounmap(adapter->hw.hw_addr); 568 pci_release_regions(pdev); 569 570 free_netdev(netdev); 571 pci_disable_device(pdev); 572} 573 574/** 575 * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter) 576 * @adapter: board private structure to initialize 577 * 578 * ixgb_sw_init initializes the Adapter private data structure. 579 * Fields are initialized based on PCI device information and 580 * OS network device settings (MTU size). 581 **/ 582 583static int 584ixgb_sw_init(struct ixgb_adapter *adapter) 585{ 586 struct ixgb_hw *hw = &adapter->hw; 587 struct net_device *netdev = adapter->netdev; 588 struct pci_dev *pdev = adapter->pdev; 589 590 /* PCI config space info */ 591 592 hw->vendor_id = pdev->vendor; 593 hw->device_id = pdev->device; 594 hw->subsystem_vendor_id = pdev->subsystem_vendor; 595 hw->subsystem_id = pdev->subsystem_device; 596 597 hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH; 598 adapter->rx_buffer_len = hw->max_frame_size + 8; /* + 8 for errata */ 599 600 if ((hw->device_id == IXGB_DEVICE_ID_82597EX) || 601 (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4) || 602 (hw->device_id == IXGB_DEVICE_ID_82597EX_LR) || 603 (hw->device_id == IXGB_DEVICE_ID_82597EX_SR)) 604 hw->mac_type = ixgb_82597; 605 else { 606 /* should never have loaded on this device */ 607 netif_err(adapter, probe, adapter->netdev, "unsupported device id\n"); 608 } 609 610 /* enable flow control to be programmed */ 611 hw->fc.send_xon = 1; 612 613 set_bit(__IXGB_DOWN, &adapter->flags); 614 return 0; 615} 616 617/** 618 * ixgb_open - Called when a network interface is made active 619 * @netdev: network interface device structure 620 * 621 * Returns 0 on success, negative value on failure 622 * 623 * The open entry point is called when a network interface is made 624 * active by the system (IFF_UP). At this point all resources needed 625 * for transmit and receive operations are allocated, the interrupt 626 * handler is registered with the OS, the watchdog timer is started, 627 * and the stack is notified that the interface is ready. 628 **/ 629 630static int 631ixgb_open(struct net_device *netdev) 632{ 633 struct ixgb_adapter *adapter = netdev_priv(netdev); 634 int err; 635 636 /* allocate transmit descriptors */ 637 err = ixgb_setup_tx_resources(adapter); 638 if (err) 639 goto err_setup_tx; 640 641 netif_carrier_off(netdev); 642 643 /* allocate receive descriptors */ 644 645 err = ixgb_setup_rx_resources(adapter); 646 if (err) 647 goto err_setup_rx; 648 649 err = ixgb_up(adapter); 650 if (err) 651 goto err_up; 652 653 netif_start_queue(netdev); 654 655 return 0; 656 657err_up: 658 ixgb_free_rx_resources(adapter); 659err_setup_rx: 660 ixgb_free_tx_resources(adapter); 661err_setup_tx: 662 ixgb_reset(adapter); 663 664 return err; 665} 666 667/** 668 * ixgb_close - Disables a network interface 669 * @netdev: network interface device structure 670 * 671 * Returns 0, this is not allowed to fail 672 * 673 * The close entry point is called when an interface is de-activated 674 * by the OS. The hardware is still under the drivers control, but 675 * needs to be disabled. A global MAC reset is issued to stop the 676 * hardware, and all transmit and receive resources are freed. 677 **/ 678 679static int 680ixgb_close(struct net_device *netdev) 681{ 682 struct ixgb_adapter *adapter = netdev_priv(netdev); 683 684 ixgb_down(adapter, true); 685 686 ixgb_free_tx_resources(adapter); 687 ixgb_free_rx_resources(adapter); 688 689 return 0; 690} 691 692/** 693 * ixgb_setup_tx_resources - allocate Tx resources (Descriptors) 694 * @adapter: board private structure 695 * 696 * Return 0 on success, negative on failure 697 **/ 698 699int 700ixgb_setup_tx_resources(struct ixgb_adapter *adapter) 701{ 702 struct ixgb_desc_ring *txdr = &adapter->tx_ring; 703 struct pci_dev *pdev = adapter->pdev; 704 int size; 705 706 size = sizeof(struct ixgb_buffer) * txdr->count; 707 txdr->buffer_info = vzalloc(size); 708 if (!txdr->buffer_info) 709 return -ENOMEM; 710 711 /* round up to nearest 4K */ 712 713 txdr->size = txdr->count * sizeof(struct ixgb_tx_desc); 714 txdr->size = ALIGN(txdr->size, 4096); 715 716 txdr->desc = dma_zalloc_coherent(&pdev->dev, txdr->size, &txdr->dma, 717 GFP_KERNEL); 718 if (!txdr->desc) { 719 vfree(txdr->buffer_info); 720 return -ENOMEM; 721 } 722 723 txdr->next_to_use = 0; 724 txdr->next_to_clean = 0; 725 726 return 0; 727} 728 729/** 730 * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset. 731 * @adapter: board private structure 732 * 733 * Configure the Tx unit of the MAC after a reset. 734 **/ 735 736static void 737ixgb_configure_tx(struct ixgb_adapter *adapter) 738{ 739 u64 tdba = adapter->tx_ring.dma; 740 u32 tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc); 741 u32 tctl; 742 struct ixgb_hw *hw = &adapter->hw; 743 744 /* Setup the Base and Length of the Tx Descriptor Ring 745 * tx_ring.dma can be either a 32 or 64 bit value 746 */ 747 748 IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL)); 749 IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32)); 750 751 IXGB_WRITE_REG(hw, TDLEN, tdlen); 752 753 /* Setup the HW Tx Head and Tail descriptor pointers */ 754 755 IXGB_WRITE_REG(hw, TDH, 0); 756 IXGB_WRITE_REG(hw, TDT, 0); 757 758 /* don't set up txdctl, it induces performance problems if configured 759 * incorrectly */ 760 /* Set the Tx Interrupt Delay register */ 761 762 IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay); 763 764 /* Program the Transmit Control Register */ 765 766 tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE; 767 IXGB_WRITE_REG(hw, TCTL, tctl); 768 769 /* Setup Transmit Descriptor Settings for this adapter */ 770 adapter->tx_cmd_type = 771 IXGB_TX_DESC_TYPE | 772 (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0); 773} 774 775/** 776 * ixgb_setup_rx_resources - allocate Rx resources (Descriptors) 777 * @adapter: board private structure 778 * 779 * Returns 0 on success, negative on failure 780 **/ 781 782int 783ixgb_setup_rx_resources(struct ixgb_adapter *adapter) 784{ 785 struct ixgb_desc_ring *rxdr = &adapter->rx_ring; 786 struct pci_dev *pdev = adapter->pdev; 787 int size; 788 789 size = sizeof(struct ixgb_buffer) * rxdr->count; 790 rxdr->buffer_info = vzalloc(size); 791 if (!rxdr->buffer_info) 792 return -ENOMEM; 793 794 /* Round up to nearest 4K */ 795 796 rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc); 797 rxdr->size = ALIGN(rxdr->size, 4096); 798 799 rxdr->desc = dma_alloc_coherent(&pdev->dev, rxdr->size, &rxdr->dma, 800 GFP_KERNEL); 801 802 if (!rxdr->desc) { 803 vfree(rxdr->buffer_info); 804 return -ENOMEM; 805 } 806 memset(rxdr->desc, 0, rxdr->size); 807 808 rxdr->next_to_clean = 0; 809 rxdr->next_to_use = 0; 810 811 return 0; 812} 813 814/** 815 * ixgb_setup_rctl - configure the receive control register 816 * @adapter: Board private structure 817 **/ 818 819static void 820ixgb_setup_rctl(struct ixgb_adapter *adapter) 821{ 822 u32 rctl; 823 824 rctl = IXGB_READ_REG(&adapter->hw, RCTL); 825 826 rctl &= ~(3 << IXGB_RCTL_MO_SHIFT); 827 828 rctl |= 829 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 | 830 IXGB_RCTL_RXEN | IXGB_RCTL_CFF | 831 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT); 832 833 rctl |= IXGB_RCTL_SECRC; 834 835 if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048) 836 rctl |= IXGB_RCTL_BSIZE_2048; 837 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096) 838 rctl |= IXGB_RCTL_BSIZE_4096; 839 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192) 840 rctl |= IXGB_RCTL_BSIZE_8192; 841 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384) 842 rctl |= IXGB_RCTL_BSIZE_16384; 843 844 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl); 845} 846 847/** 848 * ixgb_configure_rx - Configure 82597 Receive Unit after Reset. 849 * @adapter: board private structure 850 * 851 * Configure the Rx unit of the MAC after a reset. 852 **/ 853 854static void 855ixgb_configure_rx(struct ixgb_adapter *adapter) 856{ 857 u64 rdba = adapter->rx_ring.dma; 858 u32 rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc); 859 struct ixgb_hw *hw = &adapter->hw; 860 u32 rctl; 861 u32 rxcsum; 862 863 /* make sure receives are disabled while setting up the descriptors */ 864 865 rctl = IXGB_READ_REG(hw, RCTL); 866 IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN); 867 868 /* set the Receive Delay Timer Register */ 869 870 IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay); 871 872 /* Setup the Base and Length of the Rx Descriptor Ring */ 873 874 IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL)); 875 IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32)); 876 877 IXGB_WRITE_REG(hw, RDLEN, rdlen); 878 879 /* Setup the HW Rx Head and Tail Descriptor Pointers */ 880 IXGB_WRITE_REG(hw, RDH, 0); 881 IXGB_WRITE_REG(hw, RDT, 0); 882 883 /* due to the hardware errata with RXDCTL, we are unable to use any of 884 * the performance enhancing features of it without causing other 885 * subtle bugs, some of the bugs could include receive length 886 * corruption at high data rates (WTHRESH > 0) and/or receive 887 * descriptor ring irregularites (particularly in hardware cache) */ 888 IXGB_WRITE_REG(hw, RXDCTL, 0); 889 890 /* Enable Receive Checksum Offload for TCP and UDP */ 891 if (adapter->rx_csum) { 892 rxcsum = IXGB_READ_REG(hw, RXCSUM); 893 rxcsum |= IXGB_RXCSUM_TUOFL; 894 IXGB_WRITE_REG(hw, RXCSUM, rxcsum); 895 } 896 897 /* Enable Receives */ 898 899 IXGB_WRITE_REG(hw, RCTL, rctl); 900} 901 902/** 903 * ixgb_free_tx_resources - Free Tx Resources 904 * @adapter: board private structure 905 * 906 * Free all transmit software resources 907 **/ 908 909void 910ixgb_free_tx_resources(struct ixgb_adapter *adapter) 911{ 912 struct pci_dev *pdev = adapter->pdev; 913 914 ixgb_clean_tx_ring(adapter); 915 916 vfree(adapter->tx_ring.buffer_info); 917 adapter->tx_ring.buffer_info = NULL; 918 919 dma_free_coherent(&pdev->dev, adapter->tx_ring.size, 920 adapter->tx_ring.desc, adapter->tx_ring.dma); 921 922 adapter->tx_ring.desc = NULL; 923} 924 925static void 926ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter, 927 struct ixgb_buffer *buffer_info) 928{ 929 if (buffer_info->dma) { 930 if (buffer_info->mapped_as_page) 931 dma_unmap_page(&adapter->pdev->dev, buffer_info->dma, 932 buffer_info->length, DMA_TO_DEVICE); 933 else 934 dma_unmap_single(&adapter->pdev->dev, buffer_info->dma, 935 buffer_info->length, DMA_TO_DEVICE); 936 buffer_info->dma = 0; 937 } 938 939 if (buffer_info->skb) { 940 dev_kfree_skb_any(buffer_info->skb); 941 buffer_info->skb = NULL; 942 } 943 buffer_info->time_stamp = 0; 944 /* these fields must always be initialized in tx 945 * buffer_info->length = 0; 946 * buffer_info->next_to_watch = 0; */ 947} 948 949/** 950 * ixgb_clean_tx_ring - Free Tx Buffers 951 * @adapter: board private structure 952 **/ 953 954static void 955ixgb_clean_tx_ring(struct ixgb_adapter *adapter) 956{ 957 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring; 958 struct ixgb_buffer *buffer_info; 959 unsigned long size; 960 unsigned int i; 961 962 /* Free all the Tx ring sk_buffs */ 963 964 for (i = 0; i < tx_ring->count; i++) { 965 buffer_info = &tx_ring->buffer_info[i]; 966 ixgb_unmap_and_free_tx_resource(adapter, buffer_info); 967 } 968 969 size = sizeof(struct ixgb_buffer) * tx_ring->count; 970 memset(tx_ring->buffer_info, 0, size); 971 972 /* Zero out the descriptor ring */ 973 974 memset(tx_ring->desc, 0, tx_ring->size); 975 976 tx_ring->next_to_use = 0; 977 tx_ring->next_to_clean = 0; 978 979 IXGB_WRITE_REG(&adapter->hw, TDH, 0); 980 IXGB_WRITE_REG(&adapter->hw, TDT, 0); 981} 982 983/** 984 * ixgb_free_rx_resources - Free Rx Resources 985 * @adapter: board private structure 986 * 987 * Free all receive software resources 988 **/ 989 990void 991ixgb_free_rx_resources(struct ixgb_adapter *adapter) 992{ 993 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring; 994 struct pci_dev *pdev = adapter->pdev; 995 996 ixgb_clean_rx_ring(adapter); 997 998 vfree(rx_ring->buffer_info); 999 rx_ring->buffer_info = NULL; 1000 1001 dma_free_coherent(&pdev->dev, rx_ring->size, rx_ring->desc, 1002 rx_ring->dma); 1003 1004 rx_ring->desc = NULL; 1005} 1006 1007/** 1008 * ixgb_clean_rx_ring - Free Rx Buffers 1009 * @adapter: board private structure 1010 **/ 1011 1012static void 1013ixgb_clean_rx_ring(struct ixgb_adapter *adapter) 1014{ 1015 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring; 1016 struct ixgb_buffer *buffer_info; 1017 struct pci_dev *pdev = adapter->pdev; 1018 unsigned long size; 1019 unsigned int i; 1020 1021 /* Free all the Rx ring sk_buffs */ 1022 1023 for (i = 0; i < rx_ring->count; i++) { 1024 buffer_info = &rx_ring->buffer_info[i]; 1025 if (buffer_info->dma) { 1026 dma_unmap_single(&pdev->dev, 1027 buffer_info->dma, 1028 buffer_info->length, 1029 DMA_FROM_DEVICE); 1030 buffer_info->dma = 0; 1031 buffer_info->length = 0; 1032 } 1033 1034 if (buffer_info->skb) { 1035 dev_kfree_skb(buffer_info->skb); 1036 buffer_info->skb = NULL; 1037 } 1038 } 1039 1040 size = sizeof(struct ixgb_buffer) * rx_ring->count; 1041 memset(rx_ring->buffer_info, 0, size); 1042 1043 /* Zero out the descriptor ring */ 1044 1045 memset(rx_ring->desc, 0, rx_ring->size); 1046 1047 rx_ring->next_to_clean = 0; 1048 rx_ring->next_to_use = 0; 1049 1050 IXGB_WRITE_REG(&adapter->hw, RDH, 0); 1051 IXGB_WRITE_REG(&adapter->hw, RDT, 0); 1052} 1053 1054/** 1055 * ixgb_set_mac - Change the Ethernet Address of the NIC 1056 * @netdev: network interface device structure 1057 * @p: pointer to an address structure 1058 * 1059 * Returns 0 on success, negative on failure 1060 **/ 1061 1062static int 1063ixgb_set_mac(struct net_device *netdev, void *p) 1064{ 1065 struct ixgb_adapter *adapter = netdev_priv(netdev); 1066 struct sockaddr *addr = p; 1067 1068 if (!is_valid_ether_addr(addr->sa_data)) 1069 return -EADDRNOTAVAIL; 1070 1071 memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len); 1072 1073 ixgb_rar_set(&adapter->hw, addr->sa_data, 0); 1074 1075 return 0; 1076} 1077 1078/** 1079 * ixgb_set_multi - Multicast and Promiscuous mode set 1080 * @netdev: network interface device structure 1081 * 1082 * The set_multi entry point is called whenever the multicast address 1083 * list or the network interface flags are updated. This routine is 1084 * responsible for configuring the hardware for proper multicast, 1085 * promiscuous mode, and all-multi behavior. 1086 **/ 1087 1088static void 1089ixgb_set_multi(struct net_device *netdev) 1090{ 1091 struct ixgb_adapter *adapter = netdev_priv(netdev); 1092 struct ixgb_hw *hw = &adapter->hw; 1093 struct netdev_hw_addr *ha; 1094 u32 rctl; 1095 1096 /* Check for Promiscuous and All Multicast modes */ 1097 1098 rctl = IXGB_READ_REG(hw, RCTL); 1099 1100 if (netdev->flags & IFF_PROMISC) { 1101 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE); 1102 /* disable VLAN filtering */ 1103 rctl &= ~IXGB_RCTL_CFIEN; 1104 rctl &= ~IXGB_RCTL_VFE; 1105 } else { 1106 if (netdev->flags & IFF_ALLMULTI) { 1107 rctl |= IXGB_RCTL_MPE; 1108 rctl &= ~IXGB_RCTL_UPE; 1109 } else { 1110 rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE); 1111 } 1112 /* enable VLAN filtering */ 1113 rctl |= IXGB_RCTL_VFE; 1114 rctl &= ~IXGB_RCTL_CFIEN; 1115 } 1116 1117 if (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES) { 1118 rctl |= IXGB_RCTL_MPE; 1119 IXGB_WRITE_REG(hw, RCTL, rctl); 1120 } else { 1121 u8 *mta = kmalloc(IXGB_MAX_NUM_MULTICAST_ADDRESSES * 1122 ETH_ALEN, GFP_ATOMIC); 1123 u8 *addr; 1124 if (!mta) 1125 goto alloc_failed; 1126 1127 IXGB_WRITE_REG(hw, RCTL, rctl); 1128 1129 addr = mta; 1130 netdev_for_each_mc_addr(ha, netdev) { 1131 memcpy(addr, ha->addr, ETH_ALEN); 1132 addr += ETH_ALEN; 1133 } 1134 1135 ixgb_mc_addr_list_update(hw, mta, netdev_mc_count(netdev), 0); 1136 kfree(mta); 1137 } 1138 1139alloc_failed: 1140 if (netdev->features & NETIF_F_HW_VLAN_CTAG_RX) 1141 ixgb_vlan_strip_enable(adapter); 1142 else 1143 ixgb_vlan_strip_disable(adapter); 1144 1145} 1146 1147/** 1148 * ixgb_watchdog - Timer Call-back 1149 * @data: pointer to netdev cast into an unsigned long 1150 **/ 1151 1152static void 1153ixgb_watchdog(unsigned long data) 1154{ 1155 struct ixgb_adapter *adapter = (struct ixgb_adapter *)data; 1156 struct net_device *netdev = adapter->netdev; 1157 struct ixgb_desc_ring *txdr = &adapter->tx_ring; 1158 1159 ixgb_check_for_link(&adapter->hw); 1160 1161 if (ixgb_check_for_bad_link(&adapter->hw)) { 1162 /* force the reset path */ 1163 netif_stop_queue(netdev); 1164 } 1165 1166 if (adapter->hw.link_up) { 1167 if (!netif_carrier_ok(netdev)) { 1168 netdev_info(netdev, 1169 "NIC Link is Up 10 Gbps Full Duplex, Flow Control: %s\n", 1170 (adapter->hw.fc.type == ixgb_fc_full) ? 1171 "RX/TX" : 1172 (adapter->hw.fc.type == ixgb_fc_rx_pause) ? 1173 "RX" : 1174 (adapter->hw.fc.type == ixgb_fc_tx_pause) ? 1175 "TX" : "None"); 1176 adapter->link_speed = 10000; 1177 adapter->link_duplex = FULL_DUPLEX; 1178 netif_carrier_on(netdev); 1179 } 1180 } else { 1181 if (netif_carrier_ok(netdev)) { 1182 adapter->link_speed = 0; 1183 adapter->link_duplex = 0; 1184 netdev_info(netdev, "NIC Link is Down\n"); 1185 netif_carrier_off(netdev); 1186 } 1187 } 1188 1189 ixgb_update_stats(adapter); 1190 1191 if (!netif_carrier_ok(netdev)) { 1192 if (IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) { 1193 /* We've lost link, so the controller stops DMA, 1194 * but we've got queued Tx work that's never going 1195 * to get done, so reset controller to flush Tx. 1196 * (Do the reset outside of interrupt context). */ 1197 schedule_work(&adapter->tx_timeout_task); 1198 /* return immediately since reset is imminent */ 1199 return; 1200 } 1201 } 1202 1203 /* Force detection of hung controller every watchdog period */ 1204 adapter->detect_tx_hung = true; 1205 1206 /* generate an interrupt to force clean up of any stragglers */ 1207 IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW); 1208 1209 /* Reset the timer */ 1210 mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ); 1211} 1212 1213#define IXGB_TX_FLAGS_CSUM 0x00000001 1214#define IXGB_TX_FLAGS_VLAN 0x00000002 1215#define IXGB_TX_FLAGS_TSO 0x00000004 1216 1217static int 1218ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb) 1219{ 1220 struct ixgb_context_desc *context_desc; 1221 unsigned int i; 1222 u8 ipcss, ipcso, tucss, tucso, hdr_len; 1223 u16 ipcse, tucse, mss; 1224 1225 if (likely(skb_is_gso(skb))) { 1226 struct ixgb_buffer *buffer_info; 1227 struct iphdr *iph; 1228 int err; 1229 1230 err = skb_cow_head(skb, 0); 1231 if (err < 0) 1232 return err; 1233 1234 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb); 1235 mss = skb_shinfo(skb)->gso_size; 1236 iph = ip_hdr(skb); 1237 iph->tot_len = 0; 1238 iph->check = 0; 1239 tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr, 1240 iph->daddr, 0, 1241 IPPROTO_TCP, 0); 1242 ipcss = skb_network_offset(skb); 1243 ipcso = (void *)&(iph->check) - (void *)skb->data; 1244 ipcse = skb_transport_offset(skb) - 1; 1245 tucss = skb_transport_offset(skb); 1246 tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data; 1247 tucse = 0; 1248 1249 i = adapter->tx_ring.next_to_use; 1250 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i); 1251 buffer_info = &adapter->tx_ring.buffer_info[i]; 1252 WARN_ON(buffer_info->dma != 0); 1253 1254 context_desc->ipcss = ipcss; 1255 context_desc->ipcso = ipcso; 1256 context_desc->ipcse = cpu_to_le16(ipcse); 1257 context_desc->tucss = tucss; 1258 context_desc->tucso = tucso; 1259 context_desc->tucse = cpu_to_le16(tucse); 1260 context_desc->mss = cpu_to_le16(mss); 1261 context_desc->hdr_len = hdr_len; 1262 context_desc->status = 0; 1263 context_desc->cmd_type_len = cpu_to_le32( 1264 IXGB_CONTEXT_DESC_TYPE 1265 | IXGB_CONTEXT_DESC_CMD_TSE 1266 | IXGB_CONTEXT_DESC_CMD_IP 1267 | IXGB_CONTEXT_DESC_CMD_TCP 1268 | IXGB_CONTEXT_DESC_CMD_IDE 1269 | (skb->len - (hdr_len))); 1270 1271 1272 if (++i == adapter->tx_ring.count) i = 0; 1273 adapter->tx_ring.next_to_use = i; 1274 1275 return 1; 1276 } 1277 1278 return 0; 1279} 1280 1281static bool 1282ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb) 1283{ 1284 struct ixgb_context_desc *context_desc; 1285 unsigned int i; 1286 u8 css, cso; 1287 1288 if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) { 1289 struct ixgb_buffer *buffer_info; 1290 css = skb_checksum_start_offset(skb); 1291 cso = css + skb->csum_offset; 1292 1293 i = adapter->tx_ring.next_to_use; 1294 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i); 1295 buffer_info = &adapter->tx_ring.buffer_info[i]; 1296 WARN_ON(buffer_info->dma != 0); 1297 1298 context_desc->tucss = css; 1299 context_desc->tucso = cso; 1300 context_desc->tucse = 0; 1301 /* zero out any previously existing data in one instruction */ 1302 *(u32 *)&(context_desc->ipcss) = 0; 1303 context_desc->status = 0; 1304 context_desc->hdr_len = 0; 1305 context_desc->mss = 0; 1306 context_desc->cmd_type_len = 1307 cpu_to_le32(IXGB_CONTEXT_DESC_TYPE 1308 | IXGB_TX_DESC_CMD_IDE); 1309 1310 if (++i == adapter->tx_ring.count) i = 0; 1311 adapter->tx_ring.next_to_use = i; 1312 1313 return true; 1314 } 1315 1316 return false; 1317} 1318 1319#define IXGB_MAX_TXD_PWR 14 1320#define IXGB_MAX_DATA_PER_TXD (1<<IXGB_MAX_TXD_PWR) 1321 1322static int 1323ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb, 1324 unsigned int first) 1325{ 1326 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring; 1327 struct pci_dev *pdev = adapter->pdev; 1328 struct ixgb_buffer *buffer_info; 1329 int len = skb_headlen(skb); 1330 unsigned int offset = 0, size, count = 0, i; 1331 unsigned int mss = skb_shinfo(skb)->gso_size; 1332 unsigned int nr_frags = skb_shinfo(skb)->nr_frags; 1333 unsigned int f; 1334 1335 i = tx_ring->next_to_use; 1336 1337 while (len) { 1338 buffer_info = &tx_ring->buffer_info[i]; 1339 size = min(len, IXGB_MAX_DATA_PER_TXD); 1340 /* Workaround for premature desc write-backs 1341 * in TSO mode. Append 4-byte sentinel desc */ 1342 if (unlikely(mss && !nr_frags && size == len && size > 8)) 1343 size -= 4; 1344 1345 buffer_info->length = size; 1346 WARN_ON(buffer_info->dma != 0); 1347 buffer_info->time_stamp = jiffies; 1348 buffer_info->mapped_as_page = false; 1349 buffer_info->dma = dma_map_single(&pdev->dev, 1350 skb->data + offset, 1351 size, DMA_TO_DEVICE); 1352 if (dma_mapping_error(&pdev->dev, buffer_info->dma)) 1353 goto dma_error; 1354 buffer_info->next_to_watch = 0; 1355 1356 len -= size; 1357 offset += size; 1358 count++; 1359 if (len) { 1360 i++; 1361 if (i == tx_ring->count) 1362 i = 0; 1363 } 1364 } 1365 1366 for (f = 0; f < nr_frags; f++) { 1367 const struct skb_frag_struct *frag; 1368 1369 frag = &skb_shinfo(skb)->frags[f]; 1370 len = skb_frag_size(frag); 1371 offset = 0; 1372 1373 while (len) { 1374 i++; 1375 if (i == tx_ring->count) 1376 i = 0; 1377 1378 buffer_info = &tx_ring->buffer_info[i]; 1379 size = min(len, IXGB_MAX_DATA_PER_TXD); 1380 1381 /* Workaround for premature desc write-backs 1382 * in TSO mode. Append 4-byte sentinel desc */ 1383 if (unlikely(mss && (f == (nr_frags - 1)) 1384 && size == len && size > 8)) 1385 size -= 4; 1386 1387 buffer_info->length = size; 1388 buffer_info->time_stamp = jiffies; 1389 buffer_info->mapped_as_page = true; 1390 buffer_info->dma = 1391 skb_frag_dma_map(&pdev->dev, frag, offset, size, 1392 DMA_TO_DEVICE); 1393 if (dma_mapping_error(&pdev->dev, buffer_info->dma)) 1394 goto dma_error; 1395 buffer_info->next_to_watch = 0; 1396 1397 len -= size; 1398 offset += size; 1399 count++; 1400 } 1401 } 1402 tx_ring->buffer_info[i].skb = skb; 1403 tx_ring->buffer_info[first].next_to_watch = i; 1404 1405 return count; 1406 1407dma_error: 1408 dev_err(&pdev->dev, "TX DMA map failed\n"); 1409 buffer_info->dma = 0; 1410 if (count) 1411 count--; 1412 1413 while (count--) { 1414 if (i==0) 1415 i += tx_ring->count; 1416 i--; 1417 buffer_info = &tx_ring->buffer_info[i]; 1418 ixgb_unmap_and_free_tx_resource(adapter, buffer_info); 1419 } 1420 1421 return 0; 1422} 1423 1424static void 1425ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags) 1426{ 1427 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring; 1428 struct ixgb_tx_desc *tx_desc = NULL; 1429 struct ixgb_buffer *buffer_info; 1430 u32 cmd_type_len = adapter->tx_cmd_type; 1431 u8 status = 0; 1432 u8 popts = 0; 1433 unsigned int i; 1434 1435 if (tx_flags & IXGB_TX_FLAGS_TSO) { 1436 cmd_type_len |= IXGB_TX_DESC_CMD_TSE; 1437 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM); 1438 } 1439 1440 if (tx_flags & IXGB_TX_FLAGS_CSUM) 1441 popts |= IXGB_TX_DESC_POPTS_TXSM; 1442 1443 if (tx_flags & IXGB_TX_FLAGS_VLAN) 1444 cmd_type_len |= IXGB_TX_DESC_CMD_VLE; 1445 1446 i = tx_ring->next_to_use; 1447 1448 while (count--) { 1449 buffer_info = &tx_ring->buffer_info[i]; 1450 tx_desc = IXGB_TX_DESC(*tx_ring, i); 1451 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma); 1452 tx_desc->cmd_type_len = 1453 cpu_to_le32(cmd_type_len | buffer_info->length); 1454 tx_desc->status = status; 1455 tx_desc->popts = popts; 1456 tx_desc->vlan = cpu_to_le16(vlan_id); 1457 1458 if (++i == tx_ring->count) i = 0; 1459 } 1460 1461 tx_desc->cmd_type_len |= 1462 cpu_to_le32(IXGB_TX_DESC_CMD_EOP | IXGB_TX_DESC_CMD_RS); 1463 1464 /* Force memory writes to complete before letting h/w 1465 * know there are new descriptors to fetch. (Only 1466 * applicable for weak-ordered memory model archs, 1467 * such as IA-64). */ 1468 wmb(); 1469 1470 tx_ring->next_to_use = i; 1471 IXGB_WRITE_REG(&adapter->hw, TDT, i); 1472} 1473 1474static int __ixgb_maybe_stop_tx(struct net_device *netdev, int size) 1475{ 1476 struct ixgb_adapter *adapter = netdev_priv(netdev); 1477 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring; 1478 1479 netif_stop_queue(netdev); 1480 /* Herbert's original patch had: 1481 * smp_mb__after_netif_stop_queue(); 1482 * but since that doesn't exist yet, just open code it. */ 1483 smp_mb(); 1484 1485 /* We need to check again in a case another CPU has just 1486 * made room available. */ 1487 if (likely(IXGB_DESC_UNUSED(tx_ring) < size)) 1488 return -EBUSY; 1489 1490 /* A reprieve! */ 1491 netif_start_queue(netdev); 1492 ++adapter->restart_queue; 1493 return 0; 1494} 1495 1496static int ixgb_maybe_stop_tx(struct net_device *netdev, 1497 struct ixgb_desc_ring *tx_ring, int size) 1498{ 1499 if (likely(IXGB_DESC_UNUSED(tx_ring) >= size)) 1500 return 0; 1501 return __ixgb_maybe_stop_tx(netdev, size); 1502} 1503 1504 1505/* Tx Descriptors needed, worst case */ 1506#define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \ 1507 (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0)) 1508#define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) /* skb->date */ + \ 1509 MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 /* for context */ \ 1510 + 1 /* one more needed for sentinel TSO workaround */ 1511 1512static netdev_tx_t 1513ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev) 1514{ 1515 struct ixgb_adapter *adapter = netdev_priv(netdev); 1516 unsigned int first; 1517 unsigned int tx_flags = 0; 1518 int vlan_id = 0; 1519 int count = 0; 1520 int tso; 1521 1522 if (test_bit(__IXGB_DOWN, &adapter->flags)) { 1523 dev_kfree_skb_any(skb); 1524 return NETDEV_TX_OK; 1525 } 1526 1527 if (skb->len <= 0) { 1528 dev_kfree_skb_any(skb); 1529 return NETDEV_TX_OK; 1530 } 1531 1532 if (unlikely(ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, 1533 DESC_NEEDED))) 1534 return NETDEV_TX_BUSY; 1535 1536 if (skb_vlan_tag_present(skb)) { 1537 tx_flags |= IXGB_TX_FLAGS_VLAN; 1538 vlan_id = skb_vlan_tag_get(skb); 1539 } 1540 1541 first = adapter->tx_ring.next_to_use; 1542 1543 tso = ixgb_tso(adapter, skb); 1544 if (tso < 0) { 1545 dev_kfree_skb_any(skb); 1546 return NETDEV_TX_OK; 1547 } 1548 1549 if (likely(tso)) 1550 tx_flags |= IXGB_TX_FLAGS_TSO; 1551 else if (ixgb_tx_csum(adapter, skb)) 1552 tx_flags |= IXGB_TX_FLAGS_CSUM; 1553 1554 count = ixgb_tx_map(adapter, skb, first); 1555 1556 if (count) { 1557 ixgb_tx_queue(adapter, count, vlan_id, tx_flags); 1558 /* Make sure there is space in the ring for the next send. */ 1559 ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED); 1560 1561 } else { 1562 dev_kfree_skb_any(skb); 1563 adapter->tx_ring.buffer_info[first].time_stamp = 0; 1564 adapter->tx_ring.next_to_use = first; 1565 } 1566 1567 return NETDEV_TX_OK; 1568} 1569 1570/** 1571 * ixgb_tx_timeout - Respond to a Tx Hang 1572 * @netdev: network interface device structure 1573 **/ 1574 1575static void 1576ixgb_tx_timeout(struct net_device *netdev) 1577{ 1578 struct ixgb_adapter *adapter = netdev_priv(netdev); 1579 1580 /* Do the reset outside of interrupt context */ 1581 schedule_work(&adapter->tx_timeout_task); 1582} 1583 1584static void 1585ixgb_tx_timeout_task(struct work_struct *work) 1586{ 1587 struct ixgb_adapter *adapter = 1588 container_of(work, struct ixgb_adapter, tx_timeout_task); 1589 1590 adapter->tx_timeout_count++; 1591 ixgb_down(adapter, true); 1592 ixgb_up(adapter); 1593} 1594 1595/** 1596 * ixgb_get_stats - Get System Network Statistics 1597 * @netdev: network interface device structure 1598 * 1599 * Returns the address of the device statistics structure. 1600 * The statistics are actually updated from the timer callback. 1601 **/ 1602 1603static struct net_device_stats * 1604ixgb_get_stats(struct net_device *netdev) 1605{ 1606 return &netdev->stats; 1607} 1608 1609/** 1610 * ixgb_change_mtu - Change the Maximum Transfer Unit 1611 * @netdev: network interface device structure 1612 * @new_mtu: new value for maximum frame size 1613 * 1614 * Returns 0 on success, negative on failure 1615 **/ 1616 1617static int 1618ixgb_change_mtu(struct net_device *netdev, int new_mtu) 1619{ 1620 struct ixgb_adapter *adapter = netdev_priv(netdev); 1621 int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH; 1622 int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH; 1623 1624 /* MTU < 68 is an error for IPv4 traffic, just don't allow it */ 1625 if ((new_mtu < 68) || 1626 (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) { 1627 netif_err(adapter, probe, adapter->netdev, 1628 "Invalid MTU setting %d\n", new_mtu); 1629 return -EINVAL; 1630 } 1631 1632 if (old_max_frame == max_frame) 1633 return 0; 1634 1635 if (netif_running(netdev)) 1636 ixgb_down(adapter, true); 1637 1638 adapter->rx_buffer_len = max_frame + 8; /* + 8 for errata */ 1639 1640 netdev->mtu = new_mtu; 1641 1642 if (netif_running(netdev)) 1643 ixgb_up(adapter); 1644 1645 return 0; 1646} 1647 1648/** 1649 * ixgb_update_stats - Update the board statistics counters. 1650 * @adapter: board private structure 1651 **/ 1652 1653void 1654ixgb_update_stats(struct ixgb_adapter *adapter) 1655{ 1656 struct net_device *netdev = adapter->netdev; 1657 struct pci_dev *pdev = adapter->pdev; 1658 1659 /* Prevent stats update while adapter is being reset */ 1660 if (pci_channel_offline(pdev)) 1661 return; 1662 1663 if ((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) || 1664 (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) { 1665 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL); 1666 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL); 1667 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH); 1668 u64 bcast = ((u64)bcast_h << 32) | bcast_l; 1669 1670 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32); 1671 /* fix up multicast stats by removing broadcasts */ 1672 if (multi >= bcast) 1673 multi -= bcast; 1674 1675 adapter->stats.mprcl += (multi & 0xFFFFFFFF); 1676 adapter->stats.mprch += (multi >> 32); 1677 adapter->stats.bprcl += bcast_l; 1678 adapter->stats.bprch += bcast_h; 1679 } else { 1680 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL); 1681 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH); 1682 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL); 1683 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH); 1684 } 1685 adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL); 1686 adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH); 1687 adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL); 1688 adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH); 1689 adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL); 1690 adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH); 1691 adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL); 1692 adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH); 1693 adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL); 1694 adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH); 1695 adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL); 1696 adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH); 1697 adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL); 1698 adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH); 1699 adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC); 1700 adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC); 1701 adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC); 1702 adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC); 1703 adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS); 1704 adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC); 1705 adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC); 1706 adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC); 1707 adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL); 1708 adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH); 1709 adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL); 1710 adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH); 1711 adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL); 1712 adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH); 1713 adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL); 1714 adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH); 1715 adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL); 1716 adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH); 1717 adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL); 1718 adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH); 1719 adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL); 1720 adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH); 1721 adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL); 1722 adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH); 1723 adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL); 1724 adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH); 1725 adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC); 1726 adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C); 1727 adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC); 1728 adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC); 1729 adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC); 1730 adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC); 1731 adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC); 1732 adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC); 1733 adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC); 1734 adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC); 1735 adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC); 1736 adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC); 1737 adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC); 1738 adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC); 1739 adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC); 1740 adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC); 1741 1742 /* Fill out the OS statistics structure */ 1743 1744 netdev->stats.rx_packets = adapter->stats.gprcl; 1745 netdev->stats.tx_packets = adapter->stats.gptcl; 1746 netdev->stats.rx_bytes = adapter->stats.gorcl; 1747 netdev->stats.tx_bytes = adapter->stats.gotcl; 1748 netdev->stats.multicast = adapter->stats.mprcl; 1749 netdev->stats.collisions = 0; 1750 1751 /* ignore RLEC as it reports errors for padded (<64bytes) frames 1752 * with a length in the type/len field */ 1753 netdev->stats.rx_errors = 1754 /* adapter->stats.rnbc + */ adapter->stats.crcerrs + 1755 adapter->stats.ruc + 1756 adapter->stats.roc /*+ adapter->stats.rlec */ + 1757 adapter->stats.icbc + 1758 adapter->stats.ecbc + adapter->stats.mpc; 1759 1760 /* see above 1761 * netdev->stats.rx_length_errors = adapter->stats.rlec; 1762 */ 1763 1764 netdev->stats.rx_crc_errors = adapter->stats.crcerrs; 1765 netdev->stats.rx_fifo_errors = adapter->stats.mpc; 1766 netdev->stats.rx_missed_errors = adapter->stats.mpc; 1767 netdev->stats.rx_over_errors = adapter->stats.mpc; 1768 1769 netdev->stats.tx_errors = 0; 1770 netdev->stats.rx_frame_errors = 0; 1771 netdev->stats.tx_aborted_errors = 0; 1772 netdev->stats.tx_carrier_errors = 0; 1773 netdev->stats.tx_fifo_errors = 0; 1774 netdev->stats.tx_heartbeat_errors = 0; 1775 netdev->stats.tx_window_errors = 0; 1776} 1777 1778#define IXGB_MAX_INTR 10 1779/** 1780 * ixgb_intr - Interrupt Handler 1781 * @irq: interrupt number 1782 * @data: pointer to a network interface device structure 1783 **/ 1784 1785static irqreturn_t 1786ixgb_intr(int irq, void *data) 1787{ 1788 struct net_device *netdev = data; 1789 struct ixgb_adapter *adapter = netdev_priv(netdev); 1790 struct ixgb_hw *hw = &adapter->hw; 1791 u32 icr = IXGB_READ_REG(hw, ICR); 1792 1793 if (unlikely(!icr)) 1794 return IRQ_NONE; /* Not our interrupt */ 1795 1796 if (unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC))) 1797 if (!test_bit(__IXGB_DOWN, &adapter->flags)) 1798 mod_timer(&adapter->watchdog_timer, jiffies); 1799 1800 if (napi_schedule_prep(&adapter->napi)) { 1801 1802 /* Disable interrupts and register for poll. The flush 1803 of the posted write is intentionally left out. 1804 */ 1805 1806 IXGB_WRITE_REG(&adapter->hw, IMC, ~0); 1807 __napi_schedule(&adapter->napi); 1808 } 1809 return IRQ_HANDLED; 1810} 1811 1812/** 1813 * ixgb_clean - NAPI Rx polling callback 1814 * @adapter: board private structure 1815 **/ 1816 1817static int 1818ixgb_clean(struct napi_struct *napi, int budget) 1819{ 1820 struct ixgb_adapter *adapter = container_of(napi, struct ixgb_adapter, napi); 1821 int work_done = 0; 1822 1823 ixgb_clean_tx_irq(adapter); 1824 ixgb_clean_rx_irq(adapter, &work_done, budget); 1825 1826 /* If budget not fully consumed, exit the polling mode */ 1827 if (work_done < budget) { 1828 napi_complete(napi); 1829 if (!test_bit(__IXGB_DOWN, &adapter->flags)) 1830 ixgb_irq_enable(adapter); 1831 } 1832 1833 return work_done; 1834} 1835 1836/** 1837 * ixgb_clean_tx_irq - Reclaim resources after transmit completes 1838 * @adapter: board private structure 1839 **/ 1840 1841static bool 1842ixgb_clean_tx_irq(struct ixgb_adapter *adapter) 1843{ 1844 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring; 1845 struct net_device *netdev = adapter->netdev; 1846 struct ixgb_tx_desc *tx_desc, *eop_desc; 1847 struct ixgb_buffer *buffer_info; 1848 unsigned int i, eop; 1849 bool cleaned = false; 1850 1851 i = tx_ring->next_to_clean; 1852 eop = tx_ring->buffer_info[i].next_to_watch; 1853 eop_desc = IXGB_TX_DESC(*tx_ring, eop); 1854 1855 while (eop_desc->status & IXGB_TX_DESC_STATUS_DD) { 1856 1857 rmb(); /* read buffer_info after eop_desc */ 1858 for (cleaned = false; !cleaned; ) { 1859 tx_desc = IXGB_TX_DESC(*tx_ring, i); 1860 buffer_info = &tx_ring->buffer_info[i]; 1861 1862 if (tx_desc->popts & 1863 (IXGB_TX_DESC_POPTS_TXSM | 1864 IXGB_TX_DESC_POPTS_IXSM)) 1865 adapter->hw_csum_tx_good++; 1866 1867 ixgb_unmap_and_free_tx_resource(adapter, buffer_info); 1868 1869 *(u32 *)&(tx_desc->status) = 0; 1870 1871 cleaned = (i == eop); 1872 if (++i == tx_ring->count) i = 0; 1873 } 1874 1875 eop = tx_ring->buffer_info[i].next_to_watch; 1876 eop_desc = IXGB_TX_DESC(*tx_ring, eop); 1877 } 1878 1879 tx_ring->next_to_clean = i; 1880 1881 if (unlikely(cleaned && netif_carrier_ok(netdev) && 1882 IXGB_DESC_UNUSED(tx_ring) >= DESC_NEEDED)) { 1883 /* Make sure that anybody stopping the queue after this 1884 * sees the new next_to_clean. */ 1885 smp_mb(); 1886 1887 if (netif_queue_stopped(netdev) && 1888 !(test_bit(__IXGB_DOWN, &adapter->flags))) { 1889 netif_wake_queue(netdev); 1890 ++adapter->restart_queue; 1891 } 1892 } 1893 1894 if (adapter->detect_tx_hung) { 1895 /* detect a transmit hang in hardware, this serializes the 1896 * check with the clearing of time_stamp and movement of i */ 1897 adapter->detect_tx_hung = false; 1898 if (tx_ring->buffer_info[eop].time_stamp && 1899 time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ) 1900 && !(IXGB_READ_REG(&adapter->hw, STATUS) & 1901 IXGB_STATUS_TXOFF)) { 1902 /* detected Tx unit hang */ 1903 netif_err(adapter, drv, adapter->netdev, 1904 "Detected Tx Unit Hang\n" 1905 " TDH <%x>\n" 1906 " TDT <%x>\n" 1907 " next_to_use <%x>\n" 1908 " next_to_clean <%x>\n" 1909 "buffer_info[next_to_clean]\n" 1910 " time_stamp <%lx>\n" 1911 " next_to_watch <%x>\n" 1912 " jiffies <%lx>\n" 1913 " next_to_watch.status <%x>\n", 1914 IXGB_READ_REG(&adapter->hw, TDH), 1915 IXGB_READ_REG(&adapter->hw, TDT), 1916 tx_ring->next_to_use, 1917 tx_ring->next_to_clean, 1918 tx_ring->buffer_info[eop].time_stamp, 1919 eop, 1920 jiffies, 1921 eop_desc->status); 1922 netif_stop_queue(netdev); 1923 } 1924 } 1925 1926 return cleaned; 1927} 1928 1929/** 1930 * ixgb_rx_checksum - Receive Checksum Offload for 82597. 1931 * @adapter: board private structure 1932 * @rx_desc: receive descriptor 1933 * @sk_buff: socket buffer with received data 1934 **/ 1935 1936static void 1937ixgb_rx_checksum(struct ixgb_adapter *adapter, 1938 struct ixgb_rx_desc *rx_desc, 1939 struct sk_buff *skb) 1940{ 1941 /* Ignore Checksum bit is set OR 1942 * TCP Checksum has not been calculated 1943 */ 1944 if ((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) || 1945 (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) { 1946 skb_checksum_none_assert(skb); 1947 return; 1948 } 1949 1950 /* At this point we know the hardware did the TCP checksum */ 1951 /* now look at the TCP checksum error bit */ 1952 if (rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) { 1953 /* let the stack verify checksum errors */ 1954 skb_checksum_none_assert(skb); 1955 adapter->hw_csum_rx_error++; 1956 } else { 1957 /* TCP checksum is good */ 1958 skb->ip_summed = CHECKSUM_UNNECESSARY; 1959 adapter->hw_csum_rx_good++; 1960 } 1961} 1962 1963/* 1964 * this should improve performance for small packets with large amounts 1965 * of reassembly being done in the stack 1966 */ 1967static void ixgb_check_copybreak(struct napi_struct *napi, 1968 struct ixgb_buffer *buffer_info, 1969 u32 length, struct sk_buff **skb) 1970{ 1971 struct sk_buff *new_skb; 1972 1973 if (length > copybreak) 1974 return; 1975 1976 new_skb = napi_alloc_skb(napi, length); 1977 if (!new_skb) 1978 return; 1979 1980 skb_copy_to_linear_data_offset(new_skb, -NET_IP_ALIGN, 1981 (*skb)->data - NET_IP_ALIGN, 1982 length + NET_IP_ALIGN); 1983 /* save the skb in buffer_info as good */ 1984 buffer_info->skb = *skb; 1985 *skb = new_skb; 1986} 1987 1988/** 1989 * ixgb_clean_rx_irq - Send received data up the network stack, 1990 * @adapter: board private structure 1991 **/ 1992 1993static bool 1994ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do) 1995{ 1996 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring; 1997 struct net_device *netdev = adapter->netdev; 1998 struct pci_dev *pdev = adapter->pdev; 1999 struct ixgb_rx_desc *rx_desc, *next_rxd; 2000 struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer; 2001 u32 length; 2002 unsigned int i, j; 2003 int cleaned_count = 0; 2004 bool cleaned = false; 2005 2006 i = rx_ring->next_to_clean; 2007 rx_desc = IXGB_RX_DESC(*rx_ring, i); 2008 buffer_info = &rx_ring->buffer_info[i]; 2009 2010 while (rx_desc->status & IXGB_RX_DESC_STATUS_DD) { 2011 struct sk_buff *skb; 2012 u8 status; 2013 2014 if (*work_done >= work_to_do) 2015 break; 2016 2017 (*work_done)++; 2018 rmb(); /* read descriptor and rx_buffer_info after status DD */ 2019 status = rx_desc->status; 2020 skb = buffer_info->skb; 2021 buffer_info->skb = NULL; 2022 2023 prefetch(skb->data - NET_IP_ALIGN); 2024 2025 if (++i == rx_ring->count) 2026 i = 0; 2027 next_rxd = IXGB_RX_DESC(*rx_ring, i); 2028 prefetch(next_rxd); 2029 2030 j = i + 1; 2031 if (j == rx_ring->count) 2032 j = 0; 2033 next2_buffer = &rx_ring->buffer_info[j]; 2034 prefetch(next2_buffer); 2035 2036 next_buffer = &rx_ring->buffer_info[i]; 2037 2038 cleaned = true; 2039 cleaned_count++; 2040 2041 dma_unmap_single(&pdev->dev, 2042 buffer_info->dma, 2043 buffer_info->length, 2044 DMA_FROM_DEVICE); 2045 buffer_info->dma = 0; 2046 2047 length = le16_to_cpu(rx_desc->length); 2048 rx_desc->length = 0; 2049 2050 if (unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) { 2051 2052 /* All receives must fit into a single buffer */ 2053 2054 pr_debug("Receive packet consumed multiple buffers length<%x>\n", 2055 length); 2056 2057 dev_kfree_skb_irq(skb); 2058 goto rxdesc_done; 2059 } 2060 2061 if (unlikely(rx_desc->errors & 2062 (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE | 2063 IXGB_RX_DESC_ERRORS_P | IXGB_RX_DESC_ERRORS_RXE))) { 2064 dev_kfree_skb_irq(skb); 2065 goto rxdesc_done; 2066 } 2067 2068 ixgb_check_copybreak(&adapter->napi, buffer_info, length, &skb); 2069 2070 /* Good Receive */ 2071 skb_put(skb, length); 2072 2073 /* Receive Checksum Offload */ 2074 ixgb_rx_checksum(adapter, rx_desc, skb); 2075 2076 skb->protocol = eth_type_trans(skb, netdev); 2077 if (status & IXGB_RX_DESC_STATUS_VP) 2078 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), 2079 le16_to_cpu(rx_desc->special)); 2080 2081 netif_receive_skb(skb); 2082 2083rxdesc_done: 2084 /* clean up descriptor, might be written over by hw */ 2085 rx_desc->status = 0; 2086 2087 /* return some buffers to hardware, one at a time is too slow */ 2088 if (unlikely(cleaned_count >= IXGB_RX_BUFFER_WRITE)) { 2089 ixgb_alloc_rx_buffers(adapter, cleaned_count); 2090 cleaned_count = 0; 2091 } 2092 2093 /* use prefetched values */ 2094 rx_desc = next_rxd; 2095 buffer_info = next_buffer; 2096 } 2097 2098 rx_ring->next_to_clean = i; 2099 2100 cleaned_count = IXGB_DESC_UNUSED(rx_ring); 2101 if (cleaned_count) 2102 ixgb_alloc_rx_buffers(adapter, cleaned_count); 2103 2104 return cleaned; 2105} 2106 2107/** 2108 * ixgb_alloc_rx_buffers - Replace used receive buffers 2109 * @adapter: address of board private structure 2110 **/ 2111 2112static void 2113ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter, int cleaned_count) 2114{ 2115 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring; 2116 struct net_device *netdev = adapter->netdev; 2117 struct pci_dev *pdev = adapter->pdev; 2118 struct ixgb_rx_desc *rx_desc; 2119 struct ixgb_buffer *buffer_info; 2120 struct sk_buff *skb; 2121 unsigned int i; 2122 long cleancount; 2123 2124 i = rx_ring->next_to_use; 2125 buffer_info = &rx_ring->buffer_info[i]; 2126 cleancount = IXGB_DESC_UNUSED(rx_ring); 2127 2128 2129 /* leave three descriptors unused */ 2130 while (--cleancount > 2 && cleaned_count--) { 2131 /* recycle! its good for you */ 2132 skb = buffer_info->skb; 2133 if (skb) { 2134 skb_trim(skb, 0); 2135 goto map_skb; 2136 } 2137 2138 skb = netdev_alloc_skb_ip_align(netdev, adapter->rx_buffer_len); 2139 if (unlikely(!skb)) { 2140 /* Better luck next round */ 2141 adapter->alloc_rx_buff_failed++; 2142 break; 2143 } 2144 2145 buffer_info->skb = skb; 2146 buffer_info->length = adapter->rx_buffer_len; 2147map_skb: 2148 buffer_info->dma = dma_map_single(&pdev->dev, 2149 skb->data, 2150 adapter->rx_buffer_len, 2151 DMA_FROM_DEVICE); 2152 if (dma_mapping_error(&pdev->dev, buffer_info->dma)) { 2153 adapter->alloc_rx_buff_failed++; 2154 break; 2155 } 2156 2157 rx_desc = IXGB_RX_DESC(*rx_ring, i); 2158 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma); 2159 /* guarantee DD bit not set now before h/w gets descriptor 2160 * this is the rest of the workaround for h/w double 2161 * writeback. */ 2162 rx_desc->status = 0; 2163 2164 2165 if (++i == rx_ring->count) 2166 i = 0; 2167 buffer_info = &rx_ring->buffer_info[i]; 2168 } 2169 2170 if (likely(rx_ring->next_to_use != i)) { 2171 rx_ring->next_to_use = i; 2172 if (unlikely(i-- == 0)) 2173 i = (rx_ring->count - 1); 2174 2175 /* Force memory writes to complete before letting h/w 2176 * know there are new descriptors to fetch. (Only 2177 * applicable for weak-ordered memory model archs, such 2178 * as IA-64). */ 2179 wmb(); 2180 IXGB_WRITE_REG(&adapter->hw, RDT, i); 2181 } 2182} 2183 2184static void 2185ixgb_vlan_strip_enable(struct ixgb_adapter *adapter) 2186{ 2187 u32 ctrl; 2188 2189 /* enable VLAN tag insert/strip */ 2190 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0); 2191 ctrl |= IXGB_CTRL0_VME; 2192 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl); 2193} 2194 2195static void 2196ixgb_vlan_strip_disable(struct ixgb_adapter *adapter) 2197{ 2198 u32 ctrl; 2199 2200 /* disable VLAN tag insert/strip */ 2201 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0); 2202 ctrl &= ~IXGB_CTRL0_VME; 2203 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl); 2204} 2205 2206static int 2207ixgb_vlan_rx_add_vid(struct net_device *netdev, __be16 proto, u16 vid) 2208{ 2209 struct ixgb_adapter *adapter = netdev_priv(netdev); 2210 u32 vfta, index; 2211 2212 /* add VID to filter table */ 2213 2214 index = (vid >> 5) & 0x7F; 2215 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index); 2216 vfta |= (1 << (vid & 0x1F)); 2217 ixgb_write_vfta(&adapter->hw, index, vfta); 2218 set_bit(vid, adapter->active_vlans); 2219 2220 return 0; 2221} 2222 2223static int 2224ixgb_vlan_rx_kill_vid(struct net_device *netdev, __be16 proto, u16 vid) 2225{ 2226 struct ixgb_adapter *adapter = netdev_priv(netdev); 2227 u32 vfta, index; 2228 2229 /* remove VID from filter table */ 2230 2231 index = (vid >> 5) & 0x7F; 2232 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index); 2233 vfta &= ~(1 << (vid & 0x1F)); 2234 ixgb_write_vfta(&adapter->hw, index, vfta); 2235 clear_bit(vid, adapter->active_vlans); 2236 2237 return 0; 2238} 2239 2240static void 2241ixgb_restore_vlan(struct ixgb_adapter *adapter) 2242{ 2243 u16 vid; 2244 2245 for_each_set_bit(vid, adapter->active_vlans, VLAN_N_VID) 2246 ixgb_vlan_rx_add_vid(adapter->netdev, htons(ETH_P_8021Q), vid); 2247} 2248 2249#ifdef CONFIG_NET_POLL_CONTROLLER 2250/* 2251 * Polling 'interrupt' - used by things like netconsole to send skbs 2252 * without having to re-enable interrupts. It's not called while 2253 * the interrupt routine is executing. 2254 */ 2255 2256static void ixgb_netpoll(struct net_device *dev) 2257{ 2258 struct ixgb_adapter *adapter = netdev_priv(dev); 2259 2260 disable_irq(adapter->pdev->irq); 2261 ixgb_intr(adapter->pdev->irq, dev); 2262 enable_irq(adapter->pdev->irq); 2263} 2264#endif 2265 2266/** 2267 * ixgb_io_error_detected - called when PCI error is detected 2268 * @pdev: pointer to pci device with error 2269 * @state: pci channel state after error 2270 * 2271 * This callback is called by the PCI subsystem whenever 2272 * a PCI bus error is detected. 2273 */ 2274static pci_ers_result_t ixgb_io_error_detected(struct pci_dev *pdev, 2275 enum pci_channel_state state) 2276{ 2277 struct net_device *netdev = pci_get_drvdata(pdev); 2278 struct ixgb_adapter *adapter = netdev_priv(netdev); 2279 2280 netif_device_detach(netdev); 2281 2282 if (state == pci_channel_io_perm_failure) 2283 return PCI_ERS_RESULT_DISCONNECT; 2284 2285 if (netif_running(netdev)) 2286 ixgb_down(adapter, true); 2287 2288 pci_disable_device(pdev); 2289 2290 /* Request a slot reset. */ 2291 return PCI_ERS_RESULT_NEED_RESET; 2292} 2293 2294/** 2295 * ixgb_io_slot_reset - called after the pci bus has been reset. 2296 * @pdev pointer to pci device with error 2297 * 2298 * This callback is called after the PCI bus has been reset. 2299 * Basically, this tries to restart the card from scratch. 2300 * This is a shortened version of the device probe/discovery code, 2301 * it resembles the first-half of the ixgb_probe() routine. 2302 */ 2303static pci_ers_result_t ixgb_io_slot_reset(struct pci_dev *pdev) 2304{ 2305 struct net_device *netdev = pci_get_drvdata(pdev); 2306 struct ixgb_adapter *adapter = netdev_priv(netdev); 2307 2308 if (pci_enable_device(pdev)) { 2309 netif_err(adapter, probe, adapter->netdev, 2310 "Cannot re-enable PCI device after reset\n"); 2311 return PCI_ERS_RESULT_DISCONNECT; 2312 } 2313 2314 /* Perform card reset only on one instance of the card */ 2315 if (0 != PCI_FUNC (pdev->devfn)) 2316 return PCI_ERS_RESULT_RECOVERED; 2317 2318 pci_set_master(pdev); 2319 2320 netif_carrier_off(netdev); 2321 netif_stop_queue(netdev); 2322 ixgb_reset(adapter); 2323 2324 /* Make sure the EEPROM is good */ 2325 if (!ixgb_validate_eeprom_checksum(&adapter->hw)) { 2326 netif_err(adapter, probe, adapter->netdev, 2327 "After reset, the EEPROM checksum is not valid\n"); 2328 return PCI_ERS_RESULT_DISCONNECT; 2329 } 2330 ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr); 2331 memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len); 2332 2333 if (!is_valid_ether_addr(netdev->perm_addr)) { 2334 netif_err(adapter, probe, adapter->netdev, 2335 "After reset, invalid MAC address\n"); 2336 return PCI_ERS_RESULT_DISCONNECT; 2337 } 2338 2339 return PCI_ERS_RESULT_RECOVERED; 2340} 2341 2342/** 2343 * ixgb_io_resume - called when its OK to resume normal operations 2344 * @pdev pointer to pci device with error 2345 * 2346 * The error recovery driver tells us that its OK to resume 2347 * normal operation. Implementation resembles the second-half 2348 * of the ixgb_probe() routine. 2349 */ 2350static void ixgb_io_resume(struct pci_dev *pdev) 2351{ 2352 struct net_device *netdev = pci_get_drvdata(pdev); 2353 struct ixgb_adapter *adapter = netdev_priv(netdev); 2354 2355 pci_set_master(pdev); 2356 2357 if (netif_running(netdev)) { 2358 if (ixgb_up(adapter)) { 2359 pr_err("can't bring device back up after reset\n"); 2360 return; 2361 } 2362 } 2363 2364 netif_device_attach(netdev); 2365 mod_timer(&adapter->watchdog_timer, jiffies); 2366} 2367 2368/* ixgb_main.c */ 2369