ixgb_main.c revision 80d5c3689b886308247da295a228a54df49a44f6
1/******************************************************************************* 2 3 Intel PRO/10GbE Linux driver 4 Copyright(c) 1999 - 2008 Intel Corporation. 5 6 This program is free software; you can redistribute it and/or modify it 7 under the terms and conditions of the GNU General Public License, 8 version 2, as published by the Free Software Foundation. 9 10 This program is distributed in the hope it will be useful, but WITHOUT 11 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 13 more details. 14 15 You should have received a copy of the GNU General Public License along with 16 this program; if not, write to the Free Software Foundation, Inc., 17 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. 18 19 The full GNU General Public License is included in this distribution in 20 the file called "COPYING". 21 22 Contact Information: 23 Linux NICS <linux.nics@intel.com> 24 e1000-devel Mailing List <e1000-devel@lists.sourceforge.net> 25 Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 26 27*******************************************************************************/ 28 29#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 30 31#include <linux/prefetch.h> 32#include "ixgb.h" 33 34char ixgb_driver_name[] = "ixgb"; 35static char ixgb_driver_string[] = "Intel(R) PRO/10GbE Network Driver"; 36 37#define DRIVERNAPI "-NAPI" 38#define DRV_VERSION "1.0.135-k2" DRIVERNAPI 39const char ixgb_driver_version[] = DRV_VERSION; 40static const char ixgb_copyright[] = "Copyright (c) 1999-2008 Intel Corporation."; 41 42#define IXGB_CB_LENGTH 256 43static unsigned int copybreak __read_mostly = IXGB_CB_LENGTH; 44module_param(copybreak, uint, 0644); 45MODULE_PARM_DESC(copybreak, 46 "Maximum size of packet that is copied to a new buffer on receive"); 47 48/* ixgb_pci_tbl - PCI Device ID Table 49 * 50 * Wildcard entries (PCI_ANY_ID) should come last 51 * Last entry must be all 0s 52 * 53 * { Vendor ID, Device ID, SubVendor ID, SubDevice ID, 54 * Class, Class Mask, private data (not used) } 55 */ 56static DEFINE_PCI_DEVICE_TABLE(ixgb_pci_tbl) = { 57 {PCI_VENDOR_ID_INTEL, IXGB_DEVICE_ID_82597EX, 58 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0}, 59 {PCI_VENDOR_ID_INTEL, IXGB_DEVICE_ID_82597EX_CX4, 60 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0}, 61 {PCI_VENDOR_ID_INTEL, IXGB_DEVICE_ID_82597EX_SR, 62 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0}, 63 {PCI_VENDOR_ID_INTEL, IXGB_DEVICE_ID_82597EX_LR, 64 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0}, 65 66 /* required last entry */ 67 {0,} 68}; 69 70MODULE_DEVICE_TABLE(pci, ixgb_pci_tbl); 71 72/* Local Function Prototypes */ 73static int ixgb_init_module(void); 74static void ixgb_exit_module(void); 75static int ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent); 76static void ixgb_remove(struct pci_dev *pdev); 77static int ixgb_sw_init(struct ixgb_adapter *adapter); 78static int ixgb_open(struct net_device *netdev); 79static int ixgb_close(struct net_device *netdev); 80static void ixgb_configure_tx(struct ixgb_adapter *adapter); 81static void ixgb_configure_rx(struct ixgb_adapter *adapter); 82static void ixgb_setup_rctl(struct ixgb_adapter *adapter); 83static void ixgb_clean_tx_ring(struct ixgb_adapter *adapter); 84static void ixgb_clean_rx_ring(struct ixgb_adapter *adapter); 85static void ixgb_set_multi(struct net_device *netdev); 86static void ixgb_watchdog(unsigned long data); 87static netdev_tx_t ixgb_xmit_frame(struct sk_buff *skb, 88 struct net_device *netdev); 89static struct net_device_stats *ixgb_get_stats(struct net_device *netdev); 90static int ixgb_change_mtu(struct net_device *netdev, int new_mtu); 91static int ixgb_set_mac(struct net_device *netdev, void *p); 92static irqreturn_t ixgb_intr(int irq, void *data); 93static bool ixgb_clean_tx_irq(struct ixgb_adapter *adapter); 94 95static int ixgb_clean(struct napi_struct *, int); 96static bool ixgb_clean_rx_irq(struct ixgb_adapter *, int *, int); 97static void ixgb_alloc_rx_buffers(struct ixgb_adapter *, int); 98 99static void ixgb_tx_timeout(struct net_device *dev); 100static void ixgb_tx_timeout_task(struct work_struct *work); 101 102static void ixgb_vlan_strip_enable(struct ixgb_adapter *adapter); 103static void ixgb_vlan_strip_disable(struct ixgb_adapter *adapter); 104static int ixgb_vlan_rx_add_vid(struct net_device *netdev, 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 napi_disable(&adapter->napi); 289 /* waiting for NAPI to complete can re-enable interrupts */ 290 ixgb_irq_disable(adapter); 291 free_irq(adapter->pdev->irq, netdev); 292 293 if (adapter->have_msi) 294 pci_disable_msi(adapter->pdev); 295 296 if (kill_watchdog) 297 del_timer_sync(&adapter->watchdog_timer); 298 299 adapter->link_speed = 0; 300 adapter->link_duplex = 0; 301 netif_carrier_off(netdev); 302 netif_stop_queue(netdev); 303 304 ixgb_reset(adapter); 305 ixgb_clean_tx_ring(adapter); 306 ixgb_clean_rx_ring(adapter); 307} 308 309void 310ixgb_reset(struct ixgb_adapter *adapter) 311{ 312 struct ixgb_hw *hw = &adapter->hw; 313 314 ixgb_adapter_stop(hw); 315 if (!ixgb_init_hw(hw)) 316 netif_err(adapter, probe, adapter->netdev, "ixgb_init_hw failed\n"); 317 318 /* restore frame size information */ 319 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT); 320 if (hw->max_frame_size > 321 IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) { 322 u32 ctrl0 = IXGB_READ_REG(hw, CTRL0); 323 if (!(ctrl0 & IXGB_CTRL0_JFE)) { 324 ctrl0 |= IXGB_CTRL0_JFE; 325 IXGB_WRITE_REG(hw, CTRL0, ctrl0); 326 } 327 } 328} 329 330static netdev_features_t 331ixgb_fix_features(struct net_device *netdev, netdev_features_t features) 332{ 333 /* 334 * Tx VLAN insertion does not work per HW design when Rx stripping is 335 * disabled. 336 */ 337 if (!(features & NETIF_F_HW_VLAN_CTAG_RX)) 338 features &= ~NETIF_F_HW_VLAN_CTAG_TX; 339 340 return features; 341} 342 343static int 344ixgb_set_features(struct net_device *netdev, netdev_features_t features) 345{ 346 struct ixgb_adapter *adapter = netdev_priv(netdev); 347 netdev_features_t changed = features ^ netdev->features; 348 349 if (!(changed & (NETIF_F_RXCSUM|NETIF_F_HW_VLAN_CTAG_RX))) 350 return 0; 351 352 adapter->rx_csum = !!(features & NETIF_F_RXCSUM); 353 354 if (netif_running(netdev)) { 355 ixgb_down(adapter, true); 356 ixgb_up(adapter); 357 ixgb_set_speed_duplex(netdev); 358 } else 359 ixgb_reset(adapter); 360 361 return 0; 362} 363 364 365static const struct net_device_ops ixgb_netdev_ops = { 366 .ndo_open = ixgb_open, 367 .ndo_stop = ixgb_close, 368 .ndo_start_xmit = ixgb_xmit_frame, 369 .ndo_get_stats = ixgb_get_stats, 370 .ndo_set_rx_mode = ixgb_set_multi, 371 .ndo_validate_addr = eth_validate_addr, 372 .ndo_set_mac_address = ixgb_set_mac, 373 .ndo_change_mtu = ixgb_change_mtu, 374 .ndo_tx_timeout = ixgb_tx_timeout, 375 .ndo_vlan_rx_add_vid = ixgb_vlan_rx_add_vid, 376 .ndo_vlan_rx_kill_vid = ixgb_vlan_rx_kill_vid, 377#ifdef CONFIG_NET_POLL_CONTROLLER 378 .ndo_poll_controller = ixgb_netpoll, 379#endif 380 .ndo_fix_features = ixgb_fix_features, 381 .ndo_set_features = ixgb_set_features, 382}; 383 384/** 385 * ixgb_probe - Device Initialization Routine 386 * @pdev: PCI device information struct 387 * @ent: entry in ixgb_pci_tbl 388 * 389 * Returns 0 on success, negative on failure 390 * 391 * ixgb_probe initializes an adapter identified by a pci_dev structure. 392 * The OS initialization, configuring of the adapter private structure, 393 * and a hardware reset occur. 394 **/ 395 396static int 397ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent) 398{ 399 struct net_device *netdev = NULL; 400 struct ixgb_adapter *adapter; 401 static int cards_found = 0; 402 int pci_using_dac; 403 int i; 404 int err; 405 406 err = pci_enable_device(pdev); 407 if (err) 408 return err; 409 410 pci_using_dac = 0; 411 err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(64)); 412 if (!err) { 413 err = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64)); 414 if (!err) 415 pci_using_dac = 1; 416 } else { 417 err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32)); 418 if (err) { 419 err = dma_set_coherent_mask(&pdev->dev, 420 DMA_BIT_MASK(32)); 421 if (err) { 422 pr_err("No usable DMA configuration, aborting\n"); 423 goto err_dma_mask; 424 } 425 } 426 } 427 428 err = pci_request_regions(pdev, ixgb_driver_name); 429 if (err) 430 goto err_request_regions; 431 432 pci_set_master(pdev); 433 434 netdev = alloc_etherdev(sizeof(struct ixgb_adapter)); 435 if (!netdev) { 436 err = -ENOMEM; 437 goto err_alloc_etherdev; 438 } 439 440 SET_NETDEV_DEV(netdev, &pdev->dev); 441 442 pci_set_drvdata(pdev, netdev); 443 adapter = netdev_priv(netdev); 444 adapter->netdev = netdev; 445 adapter->pdev = pdev; 446 adapter->hw.back = adapter; 447 adapter->msg_enable = netif_msg_init(debug, DEFAULT_MSG_ENABLE); 448 449 adapter->hw.hw_addr = pci_ioremap_bar(pdev, BAR_0); 450 if (!adapter->hw.hw_addr) { 451 err = -EIO; 452 goto err_ioremap; 453 } 454 455 for (i = BAR_1; i <= BAR_5; i++) { 456 if (pci_resource_len(pdev, i) == 0) 457 continue; 458 if (pci_resource_flags(pdev, i) & IORESOURCE_IO) { 459 adapter->hw.io_base = pci_resource_start(pdev, i); 460 break; 461 } 462 } 463 464 netdev->netdev_ops = &ixgb_netdev_ops; 465 ixgb_set_ethtool_ops(netdev); 466 netdev->watchdog_timeo = 5 * HZ; 467 netif_napi_add(netdev, &adapter->napi, ixgb_clean, 64); 468 469 strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1); 470 471 adapter->bd_number = cards_found; 472 adapter->link_speed = 0; 473 adapter->link_duplex = 0; 474 475 /* setup the private structure */ 476 477 err = ixgb_sw_init(adapter); 478 if (err) 479 goto err_sw_init; 480 481 netdev->hw_features = NETIF_F_SG | 482 NETIF_F_TSO | 483 NETIF_F_HW_CSUM | 484 NETIF_F_HW_VLAN_CTAG_TX | 485 NETIF_F_HW_VLAN_CTAG_RX; 486 netdev->features = netdev->hw_features | 487 NETIF_F_HW_VLAN_CTAG_FILTER; 488 netdev->hw_features |= NETIF_F_RXCSUM; 489 490 if (pci_using_dac) { 491 netdev->features |= NETIF_F_HIGHDMA; 492 netdev->vlan_features |= NETIF_F_HIGHDMA; 493 } 494 495 /* make sure the EEPROM is good */ 496 497 if (!ixgb_validate_eeprom_checksum(&adapter->hw)) { 498 netif_err(adapter, probe, adapter->netdev, 499 "The EEPROM Checksum Is Not Valid\n"); 500 err = -EIO; 501 goto err_eeprom; 502 } 503 504 ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr); 505 506 if (!is_valid_ether_addr(netdev->dev_addr)) { 507 netif_err(adapter, probe, adapter->netdev, "Invalid MAC Address\n"); 508 err = -EIO; 509 goto err_eeprom; 510 } 511 512 adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw); 513 514 init_timer(&adapter->watchdog_timer); 515 adapter->watchdog_timer.function = ixgb_watchdog; 516 adapter->watchdog_timer.data = (unsigned long)adapter; 517 518 INIT_WORK(&adapter->tx_timeout_task, ixgb_tx_timeout_task); 519 520 strcpy(netdev->name, "eth%d"); 521 err = register_netdev(netdev); 522 if (err) 523 goto err_register; 524 525 /* carrier off reporting is important to ethtool even BEFORE open */ 526 netif_carrier_off(netdev); 527 528 netif_info(adapter, probe, adapter->netdev, 529 "Intel(R) PRO/10GbE Network Connection\n"); 530 ixgb_check_options(adapter); 531 /* reset the hardware with the new settings */ 532 533 ixgb_reset(adapter); 534 535 cards_found++; 536 return 0; 537 538err_register: 539err_sw_init: 540err_eeprom: 541 iounmap(adapter->hw.hw_addr); 542err_ioremap: 543 free_netdev(netdev); 544err_alloc_etherdev: 545 pci_release_regions(pdev); 546err_request_regions: 547err_dma_mask: 548 pci_disable_device(pdev); 549 return err; 550} 551 552/** 553 * ixgb_remove - Device Removal Routine 554 * @pdev: PCI device information struct 555 * 556 * ixgb_remove is called by the PCI subsystem to alert the driver 557 * that it should release a PCI device. The could be caused by a 558 * Hot-Plug event, or because the driver is going to be removed from 559 * memory. 560 **/ 561 562static void 563ixgb_remove(struct pci_dev *pdev) 564{ 565 struct net_device *netdev = pci_get_drvdata(pdev); 566 struct ixgb_adapter *adapter = netdev_priv(netdev); 567 568 cancel_work_sync(&adapter->tx_timeout_task); 569 570 unregister_netdev(netdev); 571 572 iounmap(adapter->hw.hw_addr); 573 pci_release_regions(pdev); 574 575 free_netdev(netdev); 576 pci_disable_device(pdev); 577} 578 579/** 580 * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter) 581 * @adapter: board private structure to initialize 582 * 583 * ixgb_sw_init initializes the Adapter private data structure. 584 * Fields are initialized based on PCI device information and 585 * OS network device settings (MTU size). 586 **/ 587 588static int 589ixgb_sw_init(struct ixgb_adapter *adapter) 590{ 591 struct ixgb_hw *hw = &adapter->hw; 592 struct net_device *netdev = adapter->netdev; 593 struct pci_dev *pdev = adapter->pdev; 594 595 /* PCI config space info */ 596 597 hw->vendor_id = pdev->vendor; 598 hw->device_id = pdev->device; 599 hw->subsystem_vendor_id = pdev->subsystem_vendor; 600 hw->subsystem_id = pdev->subsystem_device; 601 602 hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH; 603 adapter->rx_buffer_len = hw->max_frame_size + 8; /* + 8 for errata */ 604 605 if ((hw->device_id == IXGB_DEVICE_ID_82597EX) || 606 (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4) || 607 (hw->device_id == IXGB_DEVICE_ID_82597EX_LR) || 608 (hw->device_id == IXGB_DEVICE_ID_82597EX_SR)) 609 hw->mac_type = ixgb_82597; 610 else { 611 /* should never have loaded on this device */ 612 netif_err(adapter, probe, adapter->netdev, "unsupported device id\n"); 613 } 614 615 /* enable flow control to be programmed */ 616 hw->fc.send_xon = 1; 617 618 set_bit(__IXGB_DOWN, &adapter->flags); 619 return 0; 620} 621 622/** 623 * ixgb_open - Called when a network interface is made active 624 * @netdev: network interface device structure 625 * 626 * Returns 0 on success, negative value on failure 627 * 628 * The open entry point is called when a network interface is made 629 * active by the system (IFF_UP). At this point all resources needed 630 * for transmit and receive operations are allocated, the interrupt 631 * handler is registered with the OS, the watchdog timer is started, 632 * and the stack is notified that the interface is ready. 633 **/ 634 635static int 636ixgb_open(struct net_device *netdev) 637{ 638 struct ixgb_adapter *adapter = netdev_priv(netdev); 639 int err; 640 641 /* allocate transmit descriptors */ 642 err = ixgb_setup_tx_resources(adapter); 643 if (err) 644 goto err_setup_tx; 645 646 netif_carrier_off(netdev); 647 648 /* allocate receive descriptors */ 649 650 err = ixgb_setup_rx_resources(adapter); 651 if (err) 652 goto err_setup_rx; 653 654 err = ixgb_up(adapter); 655 if (err) 656 goto err_up; 657 658 netif_start_queue(netdev); 659 660 return 0; 661 662err_up: 663 ixgb_free_rx_resources(adapter); 664err_setup_rx: 665 ixgb_free_tx_resources(adapter); 666err_setup_tx: 667 ixgb_reset(adapter); 668 669 return err; 670} 671 672/** 673 * ixgb_close - Disables a network interface 674 * @netdev: network interface device structure 675 * 676 * Returns 0, this is not allowed to fail 677 * 678 * The close entry point is called when an interface is de-activated 679 * by the OS. The hardware is still under the drivers control, but 680 * needs to be disabled. A global MAC reset is issued to stop the 681 * hardware, and all transmit and receive resources are freed. 682 **/ 683 684static int 685ixgb_close(struct net_device *netdev) 686{ 687 struct ixgb_adapter *adapter = netdev_priv(netdev); 688 689 ixgb_down(adapter, true); 690 691 ixgb_free_tx_resources(adapter); 692 ixgb_free_rx_resources(adapter); 693 694 return 0; 695} 696 697/** 698 * ixgb_setup_tx_resources - allocate Tx resources (Descriptors) 699 * @adapter: board private structure 700 * 701 * Return 0 on success, negative on failure 702 **/ 703 704int 705ixgb_setup_tx_resources(struct ixgb_adapter *adapter) 706{ 707 struct ixgb_desc_ring *txdr = &adapter->tx_ring; 708 struct pci_dev *pdev = adapter->pdev; 709 int size; 710 711 size = sizeof(struct ixgb_buffer) * txdr->count; 712 txdr->buffer_info = vzalloc(size); 713 if (!txdr->buffer_info) 714 return -ENOMEM; 715 716 /* round up to nearest 4K */ 717 718 txdr->size = txdr->count * sizeof(struct ixgb_tx_desc); 719 txdr->size = ALIGN(txdr->size, 4096); 720 721 txdr->desc = dma_alloc_coherent(&pdev->dev, txdr->size, &txdr->dma, 722 GFP_KERNEL | __GFP_ZERO); 723 if (!txdr->desc) { 724 vfree(txdr->buffer_info); 725 return -ENOMEM; 726 } 727 728 txdr->next_to_use = 0; 729 txdr->next_to_clean = 0; 730 731 return 0; 732} 733 734/** 735 * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset. 736 * @adapter: board private structure 737 * 738 * Configure the Tx unit of the MAC after a reset. 739 **/ 740 741static void 742ixgb_configure_tx(struct ixgb_adapter *adapter) 743{ 744 u64 tdba = adapter->tx_ring.dma; 745 u32 tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc); 746 u32 tctl; 747 struct ixgb_hw *hw = &adapter->hw; 748 749 /* Setup the Base and Length of the Tx Descriptor Ring 750 * tx_ring.dma can be either a 32 or 64 bit value 751 */ 752 753 IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL)); 754 IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32)); 755 756 IXGB_WRITE_REG(hw, TDLEN, tdlen); 757 758 /* Setup the HW Tx Head and Tail descriptor pointers */ 759 760 IXGB_WRITE_REG(hw, TDH, 0); 761 IXGB_WRITE_REG(hw, TDT, 0); 762 763 /* don't set up txdctl, it induces performance problems if configured 764 * incorrectly */ 765 /* Set the Tx Interrupt Delay register */ 766 767 IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay); 768 769 /* Program the Transmit Control Register */ 770 771 tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE; 772 IXGB_WRITE_REG(hw, TCTL, tctl); 773 774 /* Setup Transmit Descriptor Settings for this adapter */ 775 adapter->tx_cmd_type = 776 IXGB_TX_DESC_TYPE | 777 (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0); 778} 779 780/** 781 * ixgb_setup_rx_resources - allocate Rx resources (Descriptors) 782 * @adapter: board private structure 783 * 784 * Returns 0 on success, negative on failure 785 **/ 786 787int 788ixgb_setup_rx_resources(struct ixgb_adapter *adapter) 789{ 790 struct ixgb_desc_ring *rxdr = &adapter->rx_ring; 791 struct pci_dev *pdev = adapter->pdev; 792 int size; 793 794 size = sizeof(struct ixgb_buffer) * rxdr->count; 795 rxdr->buffer_info = vzalloc(size); 796 if (!rxdr->buffer_info) 797 return -ENOMEM; 798 799 /* Round up to nearest 4K */ 800 801 rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc); 802 rxdr->size = ALIGN(rxdr->size, 4096); 803 804 rxdr->desc = dma_alloc_coherent(&pdev->dev, rxdr->size, &rxdr->dma, 805 GFP_KERNEL); 806 807 if (!rxdr->desc) { 808 vfree(rxdr->buffer_info); 809 return -ENOMEM; 810 } 811 memset(rxdr->desc, 0, rxdr->size); 812 813 rxdr->next_to_clean = 0; 814 rxdr->next_to_use = 0; 815 816 return 0; 817} 818 819/** 820 * ixgb_setup_rctl - configure the receive control register 821 * @adapter: Board private structure 822 **/ 823 824static void 825ixgb_setup_rctl(struct ixgb_adapter *adapter) 826{ 827 u32 rctl; 828 829 rctl = IXGB_READ_REG(&adapter->hw, RCTL); 830 831 rctl &= ~(3 << IXGB_RCTL_MO_SHIFT); 832 833 rctl |= 834 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 | 835 IXGB_RCTL_RXEN | IXGB_RCTL_CFF | 836 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT); 837 838 rctl |= IXGB_RCTL_SECRC; 839 840 if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048) 841 rctl |= IXGB_RCTL_BSIZE_2048; 842 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096) 843 rctl |= IXGB_RCTL_BSIZE_4096; 844 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192) 845 rctl |= IXGB_RCTL_BSIZE_8192; 846 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384) 847 rctl |= IXGB_RCTL_BSIZE_16384; 848 849 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl); 850} 851 852/** 853 * ixgb_configure_rx - Configure 82597 Receive Unit after Reset. 854 * @adapter: board private structure 855 * 856 * Configure the Rx unit of the MAC after a reset. 857 **/ 858 859static void 860ixgb_configure_rx(struct ixgb_adapter *adapter) 861{ 862 u64 rdba = adapter->rx_ring.dma; 863 u32 rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc); 864 struct ixgb_hw *hw = &adapter->hw; 865 u32 rctl; 866 u32 rxcsum; 867 868 /* make sure receives are disabled while setting up the descriptors */ 869 870 rctl = IXGB_READ_REG(hw, RCTL); 871 IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN); 872 873 /* set the Receive Delay Timer Register */ 874 875 IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay); 876 877 /* Setup the Base and Length of the Rx Descriptor Ring */ 878 879 IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL)); 880 IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32)); 881 882 IXGB_WRITE_REG(hw, RDLEN, rdlen); 883 884 /* Setup the HW Rx Head and Tail Descriptor Pointers */ 885 IXGB_WRITE_REG(hw, RDH, 0); 886 IXGB_WRITE_REG(hw, RDT, 0); 887 888 /* due to the hardware errata with RXDCTL, we are unable to use any of 889 * the performance enhancing features of it without causing other 890 * subtle bugs, some of the bugs could include receive length 891 * corruption at high data rates (WTHRESH > 0) and/or receive 892 * descriptor ring irregularites (particularly in hardware cache) */ 893 IXGB_WRITE_REG(hw, RXDCTL, 0); 894 895 /* Enable Receive Checksum Offload for TCP and UDP */ 896 if (adapter->rx_csum) { 897 rxcsum = IXGB_READ_REG(hw, RXCSUM); 898 rxcsum |= IXGB_RXCSUM_TUOFL; 899 IXGB_WRITE_REG(hw, RXCSUM, rxcsum); 900 } 901 902 /* Enable Receives */ 903 904 IXGB_WRITE_REG(hw, RCTL, rctl); 905} 906 907/** 908 * ixgb_free_tx_resources - Free Tx Resources 909 * @adapter: board private structure 910 * 911 * Free all transmit software resources 912 **/ 913 914void 915ixgb_free_tx_resources(struct ixgb_adapter *adapter) 916{ 917 struct pci_dev *pdev = adapter->pdev; 918 919 ixgb_clean_tx_ring(adapter); 920 921 vfree(adapter->tx_ring.buffer_info); 922 adapter->tx_ring.buffer_info = NULL; 923 924 dma_free_coherent(&pdev->dev, adapter->tx_ring.size, 925 adapter->tx_ring.desc, adapter->tx_ring.dma); 926 927 adapter->tx_ring.desc = NULL; 928} 929 930static void 931ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter, 932 struct ixgb_buffer *buffer_info) 933{ 934 if (buffer_info->dma) { 935 if (buffer_info->mapped_as_page) 936 dma_unmap_page(&adapter->pdev->dev, buffer_info->dma, 937 buffer_info->length, DMA_TO_DEVICE); 938 else 939 dma_unmap_single(&adapter->pdev->dev, buffer_info->dma, 940 buffer_info->length, DMA_TO_DEVICE); 941 buffer_info->dma = 0; 942 } 943 944 if (buffer_info->skb) { 945 dev_kfree_skb_any(buffer_info->skb); 946 buffer_info->skb = NULL; 947 } 948 buffer_info->time_stamp = 0; 949 /* these fields must always be initialized in tx 950 * buffer_info->length = 0; 951 * buffer_info->next_to_watch = 0; */ 952} 953 954/** 955 * ixgb_clean_tx_ring - Free Tx Buffers 956 * @adapter: board private structure 957 **/ 958 959static void 960ixgb_clean_tx_ring(struct ixgb_adapter *adapter) 961{ 962 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring; 963 struct ixgb_buffer *buffer_info; 964 unsigned long size; 965 unsigned int i; 966 967 /* Free all the Tx ring sk_buffs */ 968 969 for (i = 0; i < tx_ring->count; i++) { 970 buffer_info = &tx_ring->buffer_info[i]; 971 ixgb_unmap_and_free_tx_resource(adapter, buffer_info); 972 } 973 974 size = sizeof(struct ixgb_buffer) * tx_ring->count; 975 memset(tx_ring->buffer_info, 0, size); 976 977 /* Zero out the descriptor ring */ 978 979 memset(tx_ring->desc, 0, tx_ring->size); 980 981 tx_ring->next_to_use = 0; 982 tx_ring->next_to_clean = 0; 983 984 IXGB_WRITE_REG(&adapter->hw, TDH, 0); 985 IXGB_WRITE_REG(&adapter->hw, TDT, 0); 986} 987 988/** 989 * ixgb_free_rx_resources - Free Rx Resources 990 * @adapter: board private structure 991 * 992 * Free all receive software resources 993 **/ 994 995void 996ixgb_free_rx_resources(struct ixgb_adapter *adapter) 997{ 998 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring; 999 struct pci_dev *pdev = adapter->pdev; 1000 1001 ixgb_clean_rx_ring(adapter); 1002 1003 vfree(rx_ring->buffer_info); 1004 rx_ring->buffer_info = NULL; 1005 1006 dma_free_coherent(&pdev->dev, rx_ring->size, rx_ring->desc, 1007 rx_ring->dma); 1008 1009 rx_ring->desc = NULL; 1010} 1011 1012/** 1013 * ixgb_clean_rx_ring - Free Rx Buffers 1014 * @adapter: board private structure 1015 **/ 1016 1017static void 1018ixgb_clean_rx_ring(struct ixgb_adapter *adapter) 1019{ 1020 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring; 1021 struct ixgb_buffer *buffer_info; 1022 struct pci_dev *pdev = adapter->pdev; 1023 unsigned long size; 1024 unsigned int i; 1025 1026 /* Free all the Rx ring sk_buffs */ 1027 1028 for (i = 0; i < rx_ring->count; i++) { 1029 buffer_info = &rx_ring->buffer_info[i]; 1030 if (buffer_info->dma) { 1031 dma_unmap_single(&pdev->dev, 1032 buffer_info->dma, 1033 buffer_info->length, 1034 DMA_FROM_DEVICE); 1035 buffer_info->dma = 0; 1036 buffer_info->length = 0; 1037 } 1038 1039 if (buffer_info->skb) { 1040 dev_kfree_skb(buffer_info->skb); 1041 buffer_info->skb = NULL; 1042 } 1043 } 1044 1045 size = sizeof(struct ixgb_buffer) * rx_ring->count; 1046 memset(rx_ring->buffer_info, 0, size); 1047 1048 /* Zero out the descriptor ring */ 1049 1050 memset(rx_ring->desc, 0, rx_ring->size); 1051 1052 rx_ring->next_to_clean = 0; 1053 rx_ring->next_to_use = 0; 1054 1055 IXGB_WRITE_REG(&adapter->hw, RDH, 0); 1056 IXGB_WRITE_REG(&adapter->hw, RDT, 0); 1057} 1058 1059/** 1060 * ixgb_set_mac - Change the Ethernet Address of the NIC 1061 * @netdev: network interface device structure 1062 * @p: pointer to an address structure 1063 * 1064 * Returns 0 on success, negative on failure 1065 **/ 1066 1067static int 1068ixgb_set_mac(struct net_device *netdev, void *p) 1069{ 1070 struct ixgb_adapter *adapter = netdev_priv(netdev); 1071 struct sockaddr *addr = p; 1072 1073 if (!is_valid_ether_addr(addr->sa_data)) 1074 return -EADDRNOTAVAIL; 1075 1076 memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len); 1077 1078 ixgb_rar_set(&adapter->hw, addr->sa_data, 0); 1079 1080 return 0; 1081} 1082 1083/** 1084 * ixgb_set_multi - Multicast and Promiscuous mode set 1085 * @netdev: network interface device structure 1086 * 1087 * The set_multi entry point is called whenever the multicast address 1088 * list or the network interface flags are updated. This routine is 1089 * responsible for configuring the hardware for proper multicast, 1090 * promiscuous mode, and all-multi behavior. 1091 **/ 1092 1093static void 1094ixgb_set_multi(struct net_device *netdev) 1095{ 1096 struct ixgb_adapter *adapter = netdev_priv(netdev); 1097 struct ixgb_hw *hw = &adapter->hw; 1098 struct netdev_hw_addr *ha; 1099 u32 rctl; 1100 1101 /* Check for Promiscuous and All Multicast modes */ 1102 1103 rctl = IXGB_READ_REG(hw, RCTL); 1104 1105 if (netdev->flags & IFF_PROMISC) { 1106 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE); 1107 /* disable VLAN filtering */ 1108 rctl &= ~IXGB_RCTL_CFIEN; 1109 rctl &= ~IXGB_RCTL_VFE; 1110 } else { 1111 if (netdev->flags & IFF_ALLMULTI) { 1112 rctl |= IXGB_RCTL_MPE; 1113 rctl &= ~IXGB_RCTL_UPE; 1114 } else { 1115 rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE); 1116 } 1117 /* enable VLAN filtering */ 1118 rctl |= IXGB_RCTL_VFE; 1119 rctl &= ~IXGB_RCTL_CFIEN; 1120 } 1121 1122 if (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES) { 1123 rctl |= IXGB_RCTL_MPE; 1124 IXGB_WRITE_REG(hw, RCTL, rctl); 1125 } else { 1126 u8 *mta = kmalloc(IXGB_MAX_NUM_MULTICAST_ADDRESSES * 1127 ETH_ALEN, GFP_ATOMIC); 1128 u8 *addr; 1129 if (!mta) 1130 goto alloc_failed; 1131 1132 IXGB_WRITE_REG(hw, RCTL, rctl); 1133 1134 addr = mta; 1135 netdev_for_each_mc_addr(ha, netdev) { 1136 memcpy(addr, ha->addr, ETH_ALEN); 1137 addr += ETH_ALEN; 1138 } 1139 1140 ixgb_mc_addr_list_update(hw, mta, netdev_mc_count(netdev), 0); 1141 kfree(mta); 1142 } 1143 1144alloc_failed: 1145 if (netdev->features & NETIF_F_HW_VLAN_CTAG_RX) 1146 ixgb_vlan_strip_enable(adapter); 1147 else 1148 ixgb_vlan_strip_disable(adapter); 1149 1150} 1151 1152/** 1153 * ixgb_watchdog - Timer Call-back 1154 * @data: pointer to netdev cast into an unsigned long 1155 **/ 1156 1157static void 1158ixgb_watchdog(unsigned long data) 1159{ 1160 struct ixgb_adapter *adapter = (struct ixgb_adapter *)data; 1161 struct net_device *netdev = adapter->netdev; 1162 struct ixgb_desc_ring *txdr = &adapter->tx_ring; 1163 1164 ixgb_check_for_link(&adapter->hw); 1165 1166 if (ixgb_check_for_bad_link(&adapter->hw)) { 1167 /* force the reset path */ 1168 netif_stop_queue(netdev); 1169 } 1170 1171 if (adapter->hw.link_up) { 1172 if (!netif_carrier_ok(netdev)) { 1173 netdev_info(netdev, 1174 "NIC Link is Up 10 Gbps Full Duplex, Flow Control: %s\n", 1175 (adapter->hw.fc.type == ixgb_fc_full) ? 1176 "RX/TX" : 1177 (adapter->hw.fc.type == ixgb_fc_rx_pause) ? 1178 "RX" : 1179 (adapter->hw.fc.type == ixgb_fc_tx_pause) ? 1180 "TX" : "None"); 1181 adapter->link_speed = 10000; 1182 adapter->link_duplex = FULL_DUPLEX; 1183 netif_carrier_on(netdev); 1184 } 1185 } else { 1186 if (netif_carrier_ok(netdev)) { 1187 adapter->link_speed = 0; 1188 adapter->link_duplex = 0; 1189 netdev_info(netdev, "NIC Link is Down\n"); 1190 netif_carrier_off(netdev); 1191 } 1192 } 1193 1194 ixgb_update_stats(adapter); 1195 1196 if (!netif_carrier_ok(netdev)) { 1197 if (IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) { 1198 /* We've lost link, so the controller stops DMA, 1199 * but we've got queued Tx work that's never going 1200 * to get done, so reset controller to flush Tx. 1201 * (Do the reset outside of interrupt context). */ 1202 schedule_work(&adapter->tx_timeout_task); 1203 /* return immediately since reset is imminent */ 1204 return; 1205 } 1206 } 1207 1208 /* Force detection of hung controller every watchdog period */ 1209 adapter->detect_tx_hung = true; 1210 1211 /* generate an interrupt to force clean up of any stragglers */ 1212 IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW); 1213 1214 /* Reset the timer */ 1215 mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ); 1216} 1217 1218#define IXGB_TX_FLAGS_CSUM 0x00000001 1219#define IXGB_TX_FLAGS_VLAN 0x00000002 1220#define IXGB_TX_FLAGS_TSO 0x00000004 1221 1222static int 1223ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb) 1224{ 1225 struct ixgb_context_desc *context_desc; 1226 unsigned int i; 1227 u8 ipcss, ipcso, tucss, tucso, hdr_len; 1228 u16 ipcse, tucse, mss; 1229 int err; 1230 1231 if (likely(skb_is_gso(skb))) { 1232 struct ixgb_buffer *buffer_info; 1233 struct iphdr *iph; 1234 1235 if (skb_header_cloned(skb)) { 1236 err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC); 1237 if (err) 1238 return err; 1239 } 1240 1241 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb); 1242 mss = skb_shinfo(skb)->gso_size; 1243 iph = ip_hdr(skb); 1244 iph->tot_len = 0; 1245 iph->check = 0; 1246 tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr, 1247 iph->daddr, 0, 1248 IPPROTO_TCP, 0); 1249 ipcss = skb_network_offset(skb); 1250 ipcso = (void *)&(iph->check) - (void *)skb->data; 1251 ipcse = skb_transport_offset(skb) - 1; 1252 tucss = skb_transport_offset(skb); 1253 tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data; 1254 tucse = 0; 1255 1256 i = adapter->tx_ring.next_to_use; 1257 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i); 1258 buffer_info = &adapter->tx_ring.buffer_info[i]; 1259 WARN_ON(buffer_info->dma != 0); 1260 1261 context_desc->ipcss = ipcss; 1262 context_desc->ipcso = ipcso; 1263 context_desc->ipcse = cpu_to_le16(ipcse); 1264 context_desc->tucss = tucss; 1265 context_desc->tucso = tucso; 1266 context_desc->tucse = cpu_to_le16(tucse); 1267 context_desc->mss = cpu_to_le16(mss); 1268 context_desc->hdr_len = hdr_len; 1269 context_desc->status = 0; 1270 context_desc->cmd_type_len = cpu_to_le32( 1271 IXGB_CONTEXT_DESC_TYPE 1272 | IXGB_CONTEXT_DESC_CMD_TSE 1273 | IXGB_CONTEXT_DESC_CMD_IP 1274 | IXGB_CONTEXT_DESC_CMD_TCP 1275 | IXGB_CONTEXT_DESC_CMD_IDE 1276 | (skb->len - (hdr_len))); 1277 1278 1279 if (++i == adapter->tx_ring.count) i = 0; 1280 adapter->tx_ring.next_to_use = i; 1281 1282 return 1; 1283 } 1284 1285 return 0; 1286} 1287 1288static bool 1289ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb) 1290{ 1291 struct ixgb_context_desc *context_desc; 1292 unsigned int i; 1293 u8 css, cso; 1294 1295 if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) { 1296 struct ixgb_buffer *buffer_info; 1297 css = skb_checksum_start_offset(skb); 1298 cso = css + skb->csum_offset; 1299 1300 i = adapter->tx_ring.next_to_use; 1301 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i); 1302 buffer_info = &adapter->tx_ring.buffer_info[i]; 1303 WARN_ON(buffer_info->dma != 0); 1304 1305 context_desc->tucss = css; 1306 context_desc->tucso = cso; 1307 context_desc->tucse = 0; 1308 /* zero out any previously existing data in one instruction */ 1309 *(u32 *)&(context_desc->ipcss) = 0; 1310 context_desc->status = 0; 1311 context_desc->hdr_len = 0; 1312 context_desc->mss = 0; 1313 context_desc->cmd_type_len = 1314 cpu_to_le32(IXGB_CONTEXT_DESC_TYPE 1315 | IXGB_TX_DESC_CMD_IDE); 1316 1317 if (++i == adapter->tx_ring.count) i = 0; 1318 adapter->tx_ring.next_to_use = i; 1319 1320 return true; 1321 } 1322 1323 return false; 1324} 1325 1326#define IXGB_MAX_TXD_PWR 14 1327#define IXGB_MAX_DATA_PER_TXD (1<<IXGB_MAX_TXD_PWR) 1328 1329static int 1330ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb, 1331 unsigned int first) 1332{ 1333 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring; 1334 struct pci_dev *pdev = adapter->pdev; 1335 struct ixgb_buffer *buffer_info; 1336 int len = skb_headlen(skb); 1337 unsigned int offset = 0, size, count = 0, i; 1338 unsigned int mss = skb_shinfo(skb)->gso_size; 1339 unsigned int nr_frags = skb_shinfo(skb)->nr_frags; 1340 unsigned int f; 1341 1342 i = tx_ring->next_to_use; 1343 1344 while (len) { 1345 buffer_info = &tx_ring->buffer_info[i]; 1346 size = min(len, IXGB_MAX_DATA_PER_TXD); 1347 /* Workaround for premature desc write-backs 1348 * in TSO mode. Append 4-byte sentinel desc */ 1349 if (unlikely(mss && !nr_frags && size == len && size > 8)) 1350 size -= 4; 1351 1352 buffer_info->length = size; 1353 WARN_ON(buffer_info->dma != 0); 1354 buffer_info->time_stamp = jiffies; 1355 buffer_info->mapped_as_page = false; 1356 buffer_info->dma = dma_map_single(&pdev->dev, 1357 skb->data + offset, 1358 size, DMA_TO_DEVICE); 1359 if (dma_mapping_error(&pdev->dev, buffer_info->dma)) 1360 goto dma_error; 1361 buffer_info->next_to_watch = 0; 1362 1363 len -= size; 1364 offset += size; 1365 count++; 1366 if (len) { 1367 i++; 1368 if (i == tx_ring->count) 1369 i = 0; 1370 } 1371 } 1372 1373 for (f = 0; f < nr_frags; f++) { 1374 const struct skb_frag_struct *frag; 1375 1376 frag = &skb_shinfo(skb)->frags[f]; 1377 len = skb_frag_size(frag); 1378 offset = 0; 1379 1380 while (len) { 1381 i++; 1382 if (i == tx_ring->count) 1383 i = 0; 1384 1385 buffer_info = &tx_ring->buffer_info[i]; 1386 size = min(len, IXGB_MAX_DATA_PER_TXD); 1387 1388 /* Workaround for premature desc write-backs 1389 * in TSO mode. Append 4-byte sentinel desc */ 1390 if (unlikely(mss && (f == (nr_frags - 1)) 1391 && size == len && size > 8)) 1392 size -= 4; 1393 1394 buffer_info->length = size; 1395 buffer_info->time_stamp = jiffies; 1396 buffer_info->mapped_as_page = true; 1397 buffer_info->dma = 1398 skb_frag_dma_map(&pdev->dev, frag, offset, size, 1399 DMA_TO_DEVICE); 1400 if (dma_mapping_error(&pdev->dev, buffer_info->dma)) 1401 goto dma_error; 1402 buffer_info->next_to_watch = 0; 1403 1404 len -= size; 1405 offset += size; 1406 count++; 1407 } 1408 } 1409 tx_ring->buffer_info[i].skb = skb; 1410 tx_ring->buffer_info[first].next_to_watch = i; 1411 1412 return count; 1413 1414dma_error: 1415 dev_err(&pdev->dev, "TX DMA map failed\n"); 1416 buffer_info->dma = 0; 1417 if (count) 1418 count--; 1419 1420 while (count--) { 1421 if (i==0) 1422 i += tx_ring->count; 1423 i--; 1424 buffer_info = &tx_ring->buffer_info[i]; 1425 ixgb_unmap_and_free_tx_resource(adapter, buffer_info); 1426 } 1427 1428 return 0; 1429} 1430 1431static void 1432ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags) 1433{ 1434 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring; 1435 struct ixgb_tx_desc *tx_desc = NULL; 1436 struct ixgb_buffer *buffer_info; 1437 u32 cmd_type_len = adapter->tx_cmd_type; 1438 u8 status = 0; 1439 u8 popts = 0; 1440 unsigned int i; 1441 1442 if (tx_flags & IXGB_TX_FLAGS_TSO) { 1443 cmd_type_len |= IXGB_TX_DESC_CMD_TSE; 1444 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM); 1445 } 1446 1447 if (tx_flags & IXGB_TX_FLAGS_CSUM) 1448 popts |= IXGB_TX_DESC_POPTS_TXSM; 1449 1450 if (tx_flags & IXGB_TX_FLAGS_VLAN) 1451 cmd_type_len |= IXGB_TX_DESC_CMD_VLE; 1452 1453 i = tx_ring->next_to_use; 1454 1455 while (count--) { 1456 buffer_info = &tx_ring->buffer_info[i]; 1457 tx_desc = IXGB_TX_DESC(*tx_ring, i); 1458 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma); 1459 tx_desc->cmd_type_len = 1460 cpu_to_le32(cmd_type_len | buffer_info->length); 1461 tx_desc->status = status; 1462 tx_desc->popts = popts; 1463 tx_desc->vlan = cpu_to_le16(vlan_id); 1464 1465 if (++i == tx_ring->count) i = 0; 1466 } 1467 1468 tx_desc->cmd_type_len |= 1469 cpu_to_le32(IXGB_TX_DESC_CMD_EOP | IXGB_TX_DESC_CMD_RS); 1470 1471 /* Force memory writes to complete before letting h/w 1472 * know there are new descriptors to fetch. (Only 1473 * applicable for weak-ordered memory model archs, 1474 * such as IA-64). */ 1475 wmb(); 1476 1477 tx_ring->next_to_use = i; 1478 IXGB_WRITE_REG(&adapter->hw, TDT, i); 1479} 1480 1481static int __ixgb_maybe_stop_tx(struct net_device *netdev, int size) 1482{ 1483 struct ixgb_adapter *adapter = netdev_priv(netdev); 1484 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring; 1485 1486 netif_stop_queue(netdev); 1487 /* Herbert's original patch had: 1488 * smp_mb__after_netif_stop_queue(); 1489 * but since that doesn't exist yet, just open code it. */ 1490 smp_mb(); 1491 1492 /* We need to check again in a case another CPU has just 1493 * made room available. */ 1494 if (likely(IXGB_DESC_UNUSED(tx_ring) < size)) 1495 return -EBUSY; 1496 1497 /* A reprieve! */ 1498 netif_start_queue(netdev); 1499 ++adapter->restart_queue; 1500 return 0; 1501} 1502 1503static int ixgb_maybe_stop_tx(struct net_device *netdev, 1504 struct ixgb_desc_ring *tx_ring, int size) 1505{ 1506 if (likely(IXGB_DESC_UNUSED(tx_ring) >= size)) 1507 return 0; 1508 return __ixgb_maybe_stop_tx(netdev, size); 1509} 1510 1511 1512/* Tx Descriptors needed, worst case */ 1513#define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \ 1514 (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0)) 1515#define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) /* skb->date */ + \ 1516 MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 /* for context */ \ 1517 + 1 /* one more needed for sentinel TSO workaround */ 1518 1519static netdev_tx_t 1520ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev) 1521{ 1522 struct ixgb_adapter *adapter = netdev_priv(netdev); 1523 unsigned int first; 1524 unsigned int tx_flags = 0; 1525 int vlan_id = 0; 1526 int count = 0; 1527 int tso; 1528 1529 if (test_bit(__IXGB_DOWN, &adapter->flags)) { 1530 dev_kfree_skb(skb); 1531 return NETDEV_TX_OK; 1532 } 1533 1534 if (skb->len <= 0) { 1535 dev_kfree_skb(skb); 1536 return NETDEV_TX_OK; 1537 } 1538 1539 if (unlikely(ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, 1540 DESC_NEEDED))) 1541 return NETDEV_TX_BUSY; 1542 1543 if (vlan_tx_tag_present(skb)) { 1544 tx_flags |= IXGB_TX_FLAGS_VLAN; 1545 vlan_id = vlan_tx_tag_get(skb); 1546 } 1547 1548 first = adapter->tx_ring.next_to_use; 1549 1550 tso = ixgb_tso(adapter, skb); 1551 if (tso < 0) { 1552 dev_kfree_skb(skb); 1553 return NETDEV_TX_OK; 1554 } 1555 1556 if (likely(tso)) 1557 tx_flags |= IXGB_TX_FLAGS_TSO; 1558 else if (ixgb_tx_csum(adapter, skb)) 1559 tx_flags |= IXGB_TX_FLAGS_CSUM; 1560 1561 count = ixgb_tx_map(adapter, skb, first); 1562 1563 if (count) { 1564 ixgb_tx_queue(adapter, count, vlan_id, tx_flags); 1565 /* Make sure there is space in the ring for the next send. */ 1566 ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED); 1567 1568 } else { 1569 dev_kfree_skb_any(skb); 1570 adapter->tx_ring.buffer_info[first].time_stamp = 0; 1571 adapter->tx_ring.next_to_use = first; 1572 } 1573 1574 return NETDEV_TX_OK; 1575} 1576 1577/** 1578 * ixgb_tx_timeout - Respond to a Tx Hang 1579 * @netdev: network interface device structure 1580 **/ 1581 1582static void 1583ixgb_tx_timeout(struct net_device *netdev) 1584{ 1585 struct ixgb_adapter *adapter = netdev_priv(netdev); 1586 1587 /* Do the reset outside of interrupt context */ 1588 schedule_work(&adapter->tx_timeout_task); 1589} 1590 1591static void 1592ixgb_tx_timeout_task(struct work_struct *work) 1593{ 1594 struct ixgb_adapter *adapter = 1595 container_of(work, struct ixgb_adapter, tx_timeout_task); 1596 1597 adapter->tx_timeout_count++; 1598 ixgb_down(adapter, true); 1599 ixgb_up(adapter); 1600} 1601 1602/** 1603 * ixgb_get_stats - Get System Network Statistics 1604 * @netdev: network interface device structure 1605 * 1606 * Returns the address of the device statistics structure. 1607 * The statistics are actually updated from the timer callback. 1608 **/ 1609 1610static struct net_device_stats * 1611ixgb_get_stats(struct net_device *netdev) 1612{ 1613 return &netdev->stats; 1614} 1615 1616/** 1617 * ixgb_change_mtu - Change the Maximum Transfer Unit 1618 * @netdev: network interface device structure 1619 * @new_mtu: new value for maximum frame size 1620 * 1621 * Returns 0 on success, negative on failure 1622 **/ 1623 1624static int 1625ixgb_change_mtu(struct net_device *netdev, int new_mtu) 1626{ 1627 struct ixgb_adapter *adapter = netdev_priv(netdev); 1628 int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH; 1629 int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH; 1630 1631 /* MTU < 68 is an error for IPv4 traffic, just don't allow it */ 1632 if ((new_mtu < 68) || 1633 (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) { 1634 netif_err(adapter, probe, adapter->netdev, 1635 "Invalid MTU setting %d\n", new_mtu); 1636 return -EINVAL; 1637 } 1638 1639 if (old_max_frame == max_frame) 1640 return 0; 1641 1642 if (netif_running(netdev)) 1643 ixgb_down(adapter, true); 1644 1645 adapter->rx_buffer_len = max_frame + 8; /* + 8 for errata */ 1646 1647 netdev->mtu = new_mtu; 1648 1649 if (netif_running(netdev)) 1650 ixgb_up(adapter); 1651 1652 return 0; 1653} 1654 1655/** 1656 * ixgb_update_stats - Update the board statistics counters. 1657 * @adapter: board private structure 1658 **/ 1659 1660void 1661ixgb_update_stats(struct ixgb_adapter *adapter) 1662{ 1663 struct net_device *netdev = adapter->netdev; 1664 struct pci_dev *pdev = adapter->pdev; 1665 1666 /* Prevent stats update while adapter is being reset */ 1667 if (pci_channel_offline(pdev)) 1668 return; 1669 1670 if ((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) || 1671 (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) { 1672 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL); 1673 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL); 1674 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH); 1675 u64 bcast = ((u64)bcast_h << 32) | bcast_l; 1676 1677 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32); 1678 /* fix up multicast stats by removing broadcasts */ 1679 if (multi >= bcast) 1680 multi -= bcast; 1681 1682 adapter->stats.mprcl += (multi & 0xFFFFFFFF); 1683 adapter->stats.mprch += (multi >> 32); 1684 adapter->stats.bprcl += bcast_l; 1685 adapter->stats.bprch += bcast_h; 1686 } else { 1687 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL); 1688 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH); 1689 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL); 1690 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH); 1691 } 1692 adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL); 1693 adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH); 1694 adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL); 1695 adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH); 1696 adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL); 1697 adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH); 1698 adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL); 1699 adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH); 1700 adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL); 1701 adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH); 1702 adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL); 1703 adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH); 1704 adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL); 1705 adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH); 1706 adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC); 1707 adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC); 1708 adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC); 1709 adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC); 1710 adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS); 1711 adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC); 1712 adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC); 1713 adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC); 1714 adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL); 1715 adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH); 1716 adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL); 1717 adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH); 1718 adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL); 1719 adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH); 1720 adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL); 1721 adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH); 1722 adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL); 1723 adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH); 1724 adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL); 1725 adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH); 1726 adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL); 1727 adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH); 1728 adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL); 1729 adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH); 1730 adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL); 1731 adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH); 1732 adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC); 1733 adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C); 1734 adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC); 1735 adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC); 1736 adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC); 1737 adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC); 1738 adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC); 1739 adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC); 1740 adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC); 1741 adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC); 1742 adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC); 1743 adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC); 1744 adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC); 1745 adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC); 1746 adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC); 1747 adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC); 1748 1749 /* Fill out the OS statistics structure */ 1750 1751 netdev->stats.rx_packets = adapter->stats.gprcl; 1752 netdev->stats.tx_packets = adapter->stats.gptcl; 1753 netdev->stats.rx_bytes = adapter->stats.gorcl; 1754 netdev->stats.tx_bytes = adapter->stats.gotcl; 1755 netdev->stats.multicast = adapter->stats.mprcl; 1756 netdev->stats.collisions = 0; 1757 1758 /* ignore RLEC as it reports errors for padded (<64bytes) frames 1759 * with a length in the type/len field */ 1760 netdev->stats.rx_errors = 1761 /* adapter->stats.rnbc + */ adapter->stats.crcerrs + 1762 adapter->stats.ruc + 1763 adapter->stats.roc /*+ adapter->stats.rlec */ + 1764 adapter->stats.icbc + 1765 adapter->stats.ecbc + adapter->stats.mpc; 1766 1767 /* see above 1768 * netdev->stats.rx_length_errors = adapter->stats.rlec; 1769 */ 1770 1771 netdev->stats.rx_crc_errors = adapter->stats.crcerrs; 1772 netdev->stats.rx_fifo_errors = adapter->stats.mpc; 1773 netdev->stats.rx_missed_errors = adapter->stats.mpc; 1774 netdev->stats.rx_over_errors = adapter->stats.mpc; 1775 1776 netdev->stats.tx_errors = 0; 1777 netdev->stats.rx_frame_errors = 0; 1778 netdev->stats.tx_aborted_errors = 0; 1779 netdev->stats.tx_carrier_errors = 0; 1780 netdev->stats.tx_fifo_errors = 0; 1781 netdev->stats.tx_heartbeat_errors = 0; 1782 netdev->stats.tx_window_errors = 0; 1783} 1784 1785#define IXGB_MAX_INTR 10 1786/** 1787 * ixgb_intr - Interrupt Handler 1788 * @irq: interrupt number 1789 * @data: pointer to a network interface device structure 1790 **/ 1791 1792static irqreturn_t 1793ixgb_intr(int irq, void *data) 1794{ 1795 struct net_device *netdev = data; 1796 struct ixgb_adapter *adapter = netdev_priv(netdev); 1797 struct ixgb_hw *hw = &adapter->hw; 1798 u32 icr = IXGB_READ_REG(hw, ICR); 1799 1800 if (unlikely(!icr)) 1801 return IRQ_NONE; /* Not our interrupt */ 1802 1803 if (unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC))) 1804 if (!test_bit(__IXGB_DOWN, &adapter->flags)) 1805 mod_timer(&adapter->watchdog_timer, jiffies); 1806 1807 if (napi_schedule_prep(&adapter->napi)) { 1808 1809 /* Disable interrupts and register for poll. The flush 1810 of the posted write is intentionally left out. 1811 */ 1812 1813 IXGB_WRITE_REG(&adapter->hw, IMC, ~0); 1814 __napi_schedule(&adapter->napi); 1815 } 1816 return IRQ_HANDLED; 1817} 1818 1819/** 1820 * ixgb_clean - NAPI Rx polling callback 1821 * @adapter: board private structure 1822 **/ 1823 1824static int 1825ixgb_clean(struct napi_struct *napi, int budget) 1826{ 1827 struct ixgb_adapter *adapter = container_of(napi, struct ixgb_adapter, napi); 1828 int work_done = 0; 1829 1830 ixgb_clean_tx_irq(adapter); 1831 ixgb_clean_rx_irq(adapter, &work_done, budget); 1832 1833 /* If budget not fully consumed, exit the polling mode */ 1834 if (work_done < budget) { 1835 napi_complete(napi); 1836 if (!test_bit(__IXGB_DOWN, &adapter->flags)) 1837 ixgb_irq_enable(adapter); 1838 } 1839 1840 return work_done; 1841} 1842 1843/** 1844 * ixgb_clean_tx_irq - Reclaim resources after transmit completes 1845 * @adapter: board private structure 1846 **/ 1847 1848static bool 1849ixgb_clean_tx_irq(struct ixgb_adapter *adapter) 1850{ 1851 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring; 1852 struct net_device *netdev = adapter->netdev; 1853 struct ixgb_tx_desc *tx_desc, *eop_desc; 1854 struct ixgb_buffer *buffer_info; 1855 unsigned int i, eop; 1856 bool cleaned = false; 1857 1858 i = tx_ring->next_to_clean; 1859 eop = tx_ring->buffer_info[i].next_to_watch; 1860 eop_desc = IXGB_TX_DESC(*tx_ring, eop); 1861 1862 while (eop_desc->status & IXGB_TX_DESC_STATUS_DD) { 1863 1864 rmb(); /* read buffer_info after eop_desc */ 1865 for (cleaned = false; !cleaned; ) { 1866 tx_desc = IXGB_TX_DESC(*tx_ring, i); 1867 buffer_info = &tx_ring->buffer_info[i]; 1868 1869 if (tx_desc->popts & 1870 (IXGB_TX_DESC_POPTS_TXSM | 1871 IXGB_TX_DESC_POPTS_IXSM)) 1872 adapter->hw_csum_tx_good++; 1873 1874 ixgb_unmap_and_free_tx_resource(adapter, buffer_info); 1875 1876 *(u32 *)&(tx_desc->status) = 0; 1877 1878 cleaned = (i == eop); 1879 if (++i == tx_ring->count) i = 0; 1880 } 1881 1882 eop = tx_ring->buffer_info[i].next_to_watch; 1883 eop_desc = IXGB_TX_DESC(*tx_ring, eop); 1884 } 1885 1886 tx_ring->next_to_clean = i; 1887 1888 if (unlikely(cleaned && netif_carrier_ok(netdev) && 1889 IXGB_DESC_UNUSED(tx_ring) >= DESC_NEEDED)) { 1890 /* Make sure that anybody stopping the queue after this 1891 * sees the new next_to_clean. */ 1892 smp_mb(); 1893 1894 if (netif_queue_stopped(netdev) && 1895 !(test_bit(__IXGB_DOWN, &adapter->flags))) { 1896 netif_wake_queue(netdev); 1897 ++adapter->restart_queue; 1898 } 1899 } 1900 1901 if (adapter->detect_tx_hung) { 1902 /* detect a transmit hang in hardware, this serializes the 1903 * check with the clearing of time_stamp and movement of i */ 1904 adapter->detect_tx_hung = false; 1905 if (tx_ring->buffer_info[eop].time_stamp && 1906 time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ) 1907 && !(IXGB_READ_REG(&adapter->hw, STATUS) & 1908 IXGB_STATUS_TXOFF)) { 1909 /* detected Tx unit hang */ 1910 netif_err(adapter, drv, adapter->netdev, 1911 "Detected Tx Unit Hang\n" 1912 " TDH <%x>\n" 1913 " TDT <%x>\n" 1914 " next_to_use <%x>\n" 1915 " next_to_clean <%x>\n" 1916 "buffer_info[next_to_clean]\n" 1917 " time_stamp <%lx>\n" 1918 " next_to_watch <%x>\n" 1919 " jiffies <%lx>\n" 1920 " next_to_watch.status <%x>\n", 1921 IXGB_READ_REG(&adapter->hw, TDH), 1922 IXGB_READ_REG(&adapter->hw, TDT), 1923 tx_ring->next_to_use, 1924 tx_ring->next_to_clean, 1925 tx_ring->buffer_info[eop].time_stamp, 1926 eop, 1927 jiffies, 1928 eop_desc->status); 1929 netif_stop_queue(netdev); 1930 } 1931 } 1932 1933 return cleaned; 1934} 1935 1936/** 1937 * ixgb_rx_checksum - Receive Checksum Offload for 82597. 1938 * @adapter: board private structure 1939 * @rx_desc: receive descriptor 1940 * @sk_buff: socket buffer with received data 1941 **/ 1942 1943static void 1944ixgb_rx_checksum(struct ixgb_adapter *adapter, 1945 struct ixgb_rx_desc *rx_desc, 1946 struct sk_buff *skb) 1947{ 1948 /* Ignore Checksum bit is set OR 1949 * TCP Checksum has not been calculated 1950 */ 1951 if ((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) || 1952 (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) { 1953 skb_checksum_none_assert(skb); 1954 return; 1955 } 1956 1957 /* At this point we know the hardware did the TCP checksum */ 1958 /* now look at the TCP checksum error bit */ 1959 if (rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) { 1960 /* let the stack verify checksum errors */ 1961 skb_checksum_none_assert(skb); 1962 adapter->hw_csum_rx_error++; 1963 } else { 1964 /* TCP checksum is good */ 1965 skb->ip_summed = CHECKSUM_UNNECESSARY; 1966 adapter->hw_csum_rx_good++; 1967 } 1968} 1969 1970/* 1971 * this should improve performance for small packets with large amounts 1972 * of reassembly being done in the stack 1973 */ 1974static void ixgb_check_copybreak(struct net_device *netdev, 1975 struct ixgb_buffer *buffer_info, 1976 u32 length, struct sk_buff **skb) 1977{ 1978 struct sk_buff *new_skb; 1979 1980 if (length > copybreak) 1981 return; 1982 1983 new_skb = netdev_alloc_skb_ip_align(netdev, length); 1984 if (!new_skb) 1985 return; 1986 1987 skb_copy_to_linear_data_offset(new_skb, -NET_IP_ALIGN, 1988 (*skb)->data - NET_IP_ALIGN, 1989 length + NET_IP_ALIGN); 1990 /* save the skb in buffer_info as good */ 1991 buffer_info->skb = *skb; 1992 *skb = new_skb; 1993} 1994 1995/** 1996 * ixgb_clean_rx_irq - Send received data up the network stack, 1997 * @adapter: board private structure 1998 **/ 1999 2000static bool 2001ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do) 2002{ 2003 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring; 2004 struct net_device *netdev = adapter->netdev; 2005 struct pci_dev *pdev = adapter->pdev; 2006 struct ixgb_rx_desc *rx_desc, *next_rxd; 2007 struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer; 2008 u32 length; 2009 unsigned int i, j; 2010 int cleaned_count = 0; 2011 bool cleaned = false; 2012 2013 i = rx_ring->next_to_clean; 2014 rx_desc = IXGB_RX_DESC(*rx_ring, i); 2015 buffer_info = &rx_ring->buffer_info[i]; 2016 2017 while (rx_desc->status & IXGB_RX_DESC_STATUS_DD) { 2018 struct sk_buff *skb; 2019 u8 status; 2020 2021 if (*work_done >= work_to_do) 2022 break; 2023 2024 (*work_done)++; 2025 rmb(); /* read descriptor and rx_buffer_info after status DD */ 2026 status = rx_desc->status; 2027 skb = buffer_info->skb; 2028 buffer_info->skb = NULL; 2029 2030 prefetch(skb->data - NET_IP_ALIGN); 2031 2032 if (++i == rx_ring->count) 2033 i = 0; 2034 next_rxd = IXGB_RX_DESC(*rx_ring, i); 2035 prefetch(next_rxd); 2036 2037 j = i + 1; 2038 if (j == rx_ring->count) 2039 j = 0; 2040 next2_buffer = &rx_ring->buffer_info[j]; 2041 prefetch(next2_buffer); 2042 2043 next_buffer = &rx_ring->buffer_info[i]; 2044 2045 cleaned = true; 2046 cleaned_count++; 2047 2048 dma_unmap_single(&pdev->dev, 2049 buffer_info->dma, 2050 buffer_info->length, 2051 DMA_FROM_DEVICE); 2052 buffer_info->dma = 0; 2053 2054 length = le16_to_cpu(rx_desc->length); 2055 rx_desc->length = 0; 2056 2057 if (unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) { 2058 2059 /* All receives must fit into a single buffer */ 2060 2061 pr_debug("Receive packet consumed multiple buffers length<%x>\n", 2062 length); 2063 2064 dev_kfree_skb_irq(skb); 2065 goto rxdesc_done; 2066 } 2067 2068 if (unlikely(rx_desc->errors & 2069 (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE | 2070 IXGB_RX_DESC_ERRORS_P | IXGB_RX_DESC_ERRORS_RXE))) { 2071 dev_kfree_skb_irq(skb); 2072 goto rxdesc_done; 2073 } 2074 2075 ixgb_check_copybreak(netdev, buffer_info, length, &skb); 2076 2077 /* Good Receive */ 2078 skb_put(skb, length); 2079 2080 /* Receive Checksum Offload */ 2081 ixgb_rx_checksum(adapter, rx_desc, skb); 2082 2083 skb->protocol = eth_type_trans(skb, netdev); 2084 if (status & IXGB_RX_DESC_STATUS_VP) 2085 __vlan_hwaccel_put_tag(skb, 2086 le16_to_cpu(rx_desc->special)); 2087 2088 netif_receive_skb(skb); 2089 2090rxdesc_done: 2091 /* clean up descriptor, might be written over by hw */ 2092 rx_desc->status = 0; 2093 2094 /* return some buffers to hardware, one at a time is too slow */ 2095 if (unlikely(cleaned_count >= IXGB_RX_BUFFER_WRITE)) { 2096 ixgb_alloc_rx_buffers(adapter, cleaned_count); 2097 cleaned_count = 0; 2098 } 2099 2100 /* use prefetched values */ 2101 rx_desc = next_rxd; 2102 buffer_info = next_buffer; 2103 } 2104 2105 rx_ring->next_to_clean = i; 2106 2107 cleaned_count = IXGB_DESC_UNUSED(rx_ring); 2108 if (cleaned_count) 2109 ixgb_alloc_rx_buffers(adapter, cleaned_count); 2110 2111 return cleaned; 2112} 2113 2114/** 2115 * ixgb_alloc_rx_buffers - Replace used receive buffers 2116 * @adapter: address of board private structure 2117 **/ 2118 2119static void 2120ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter, int cleaned_count) 2121{ 2122 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring; 2123 struct net_device *netdev = adapter->netdev; 2124 struct pci_dev *pdev = adapter->pdev; 2125 struct ixgb_rx_desc *rx_desc; 2126 struct ixgb_buffer *buffer_info; 2127 struct sk_buff *skb; 2128 unsigned int i; 2129 long cleancount; 2130 2131 i = rx_ring->next_to_use; 2132 buffer_info = &rx_ring->buffer_info[i]; 2133 cleancount = IXGB_DESC_UNUSED(rx_ring); 2134 2135 2136 /* leave three descriptors unused */ 2137 while (--cleancount > 2 && cleaned_count--) { 2138 /* recycle! its good for you */ 2139 skb = buffer_info->skb; 2140 if (skb) { 2141 skb_trim(skb, 0); 2142 goto map_skb; 2143 } 2144 2145 skb = netdev_alloc_skb_ip_align(netdev, adapter->rx_buffer_len); 2146 if (unlikely(!skb)) { 2147 /* Better luck next round */ 2148 adapter->alloc_rx_buff_failed++; 2149 break; 2150 } 2151 2152 buffer_info->skb = skb; 2153 buffer_info->length = adapter->rx_buffer_len; 2154map_skb: 2155 buffer_info->dma = dma_map_single(&pdev->dev, 2156 skb->data, 2157 adapter->rx_buffer_len, 2158 DMA_FROM_DEVICE); 2159 if (dma_mapping_error(&pdev->dev, buffer_info->dma)) { 2160 adapter->alloc_rx_buff_failed++; 2161 break; 2162 } 2163 2164 rx_desc = IXGB_RX_DESC(*rx_ring, i); 2165 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma); 2166 /* guarantee DD bit not set now before h/w gets descriptor 2167 * this is the rest of the workaround for h/w double 2168 * writeback. */ 2169 rx_desc->status = 0; 2170 2171 2172 if (++i == rx_ring->count) 2173 i = 0; 2174 buffer_info = &rx_ring->buffer_info[i]; 2175 } 2176 2177 if (likely(rx_ring->next_to_use != i)) { 2178 rx_ring->next_to_use = i; 2179 if (unlikely(i-- == 0)) 2180 i = (rx_ring->count - 1); 2181 2182 /* Force memory writes to complete before letting h/w 2183 * know there are new descriptors to fetch. (Only 2184 * applicable for weak-ordered memory model archs, such 2185 * as IA-64). */ 2186 wmb(); 2187 IXGB_WRITE_REG(&adapter->hw, RDT, i); 2188 } 2189} 2190 2191static void 2192ixgb_vlan_strip_enable(struct ixgb_adapter *adapter) 2193{ 2194 u32 ctrl; 2195 2196 /* enable VLAN tag insert/strip */ 2197 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0); 2198 ctrl |= IXGB_CTRL0_VME; 2199 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl); 2200} 2201 2202static void 2203ixgb_vlan_strip_disable(struct ixgb_adapter *adapter) 2204{ 2205 u32 ctrl; 2206 2207 /* disable VLAN tag insert/strip */ 2208 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0); 2209 ctrl &= ~IXGB_CTRL0_VME; 2210 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl); 2211} 2212 2213static int 2214ixgb_vlan_rx_add_vid(struct net_device *netdev, __be16 proto, u16 vid) 2215{ 2216 struct ixgb_adapter *adapter = netdev_priv(netdev); 2217 u32 vfta, index; 2218 2219 /* add VID to filter table */ 2220 2221 index = (vid >> 5) & 0x7F; 2222 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index); 2223 vfta |= (1 << (vid & 0x1F)); 2224 ixgb_write_vfta(&adapter->hw, index, vfta); 2225 set_bit(vid, adapter->active_vlans); 2226 2227 return 0; 2228} 2229 2230static int 2231ixgb_vlan_rx_kill_vid(struct net_device *netdev, __be16 proto, u16 vid) 2232{ 2233 struct ixgb_adapter *adapter = netdev_priv(netdev); 2234 u32 vfta, index; 2235 2236 /* remove VID from filter table */ 2237 2238 index = (vid >> 5) & 0x7F; 2239 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index); 2240 vfta &= ~(1 << (vid & 0x1F)); 2241 ixgb_write_vfta(&adapter->hw, index, vfta); 2242 clear_bit(vid, adapter->active_vlans); 2243 2244 return 0; 2245} 2246 2247static void 2248ixgb_restore_vlan(struct ixgb_adapter *adapter) 2249{ 2250 u16 vid; 2251 2252 for_each_set_bit(vid, adapter->active_vlans, VLAN_N_VID) 2253 ixgb_vlan_rx_add_vid(adapter->netdev, htons(ETH_P_8021Q), vid); 2254} 2255 2256#ifdef CONFIG_NET_POLL_CONTROLLER 2257/* 2258 * Polling 'interrupt' - used by things like netconsole to send skbs 2259 * without having to re-enable interrupts. It's not called while 2260 * the interrupt routine is executing. 2261 */ 2262 2263static void ixgb_netpoll(struct net_device *dev) 2264{ 2265 struct ixgb_adapter *adapter = netdev_priv(dev); 2266 2267 disable_irq(adapter->pdev->irq); 2268 ixgb_intr(adapter->pdev->irq, dev); 2269 enable_irq(adapter->pdev->irq); 2270} 2271#endif 2272 2273/** 2274 * ixgb_io_error_detected - called when PCI error is detected 2275 * @pdev: pointer to pci device with error 2276 * @state: pci channel state after error 2277 * 2278 * This callback is called by the PCI subsystem whenever 2279 * a PCI bus error is detected. 2280 */ 2281static pci_ers_result_t ixgb_io_error_detected(struct pci_dev *pdev, 2282 enum pci_channel_state state) 2283{ 2284 struct net_device *netdev = pci_get_drvdata(pdev); 2285 struct ixgb_adapter *adapter = netdev_priv(netdev); 2286 2287 netif_device_detach(netdev); 2288 2289 if (state == pci_channel_io_perm_failure) 2290 return PCI_ERS_RESULT_DISCONNECT; 2291 2292 if (netif_running(netdev)) 2293 ixgb_down(adapter, true); 2294 2295 pci_disable_device(pdev); 2296 2297 /* Request a slot reset. */ 2298 return PCI_ERS_RESULT_NEED_RESET; 2299} 2300 2301/** 2302 * ixgb_io_slot_reset - called after the pci bus has been reset. 2303 * @pdev pointer to pci device with error 2304 * 2305 * This callback is called after the PCI bus has been reset. 2306 * Basically, this tries to restart the card from scratch. 2307 * This is a shortened version of the device probe/discovery code, 2308 * it resembles the first-half of the ixgb_probe() routine. 2309 */ 2310static pci_ers_result_t ixgb_io_slot_reset(struct pci_dev *pdev) 2311{ 2312 struct net_device *netdev = pci_get_drvdata(pdev); 2313 struct ixgb_adapter *adapter = netdev_priv(netdev); 2314 2315 if (pci_enable_device(pdev)) { 2316 netif_err(adapter, probe, adapter->netdev, 2317 "Cannot re-enable PCI device after reset\n"); 2318 return PCI_ERS_RESULT_DISCONNECT; 2319 } 2320 2321 /* Perform card reset only on one instance of the card */ 2322 if (0 != PCI_FUNC (pdev->devfn)) 2323 return PCI_ERS_RESULT_RECOVERED; 2324 2325 pci_set_master(pdev); 2326 2327 netif_carrier_off(netdev); 2328 netif_stop_queue(netdev); 2329 ixgb_reset(adapter); 2330 2331 /* Make sure the EEPROM is good */ 2332 if (!ixgb_validate_eeprom_checksum(&adapter->hw)) { 2333 netif_err(adapter, probe, adapter->netdev, 2334 "After reset, the EEPROM checksum is not valid\n"); 2335 return PCI_ERS_RESULT_DISCONNECT; 2336 } 2337 ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr); 2338 memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len); 2339 2340 if (!is_valid_ether_addr(netdev->perm_addr)) { 2341 netif_err(adapter, probe, adapter->netdev, 2342 "After reset, invalid MAC address\n"); 2343 return PCI_ERS_RESULT_DISCONNECT; 2344 } 2345 2346 return PCI_ERS_RESULT_RECOVERED; 2347} 2348 2349/** 2350 * ixgb_io_resume - called when its OK to resume normal operations 2351 * @pdev pointer to pci device with error 2352 * 2353 * The error recovery driver tells us that its OK to resume 2354 * normal operation. Implementation resembles the second-half 2355 * of the ixgb_probe() routine. 2356 */ 2357static void ixgb_io_resume(struct pci_dev *pdev) 2358{ 2359 struct net_device *netdev = pci_get_drvdata(pdev); 2360 struct ixgb_adapter *adapter = netdev_priv(netdev); 2361 2362 pci_set_master(pdev); 2363 2364 if (netif_running(netdev)) { 2365 if (ixgb_up(adapter)) { 2366 pr_err("can't bring device back up after reset\n"); 2367 return; 2368 } 2369 } 2370 2371 netif_device_attach(netdev); 2372 mod_timer(&adapter->watchdog_timer, jiffies); 2373} 2374 2375/* ixgb_main.c */ 2376