ixgb_main.c revision afc4b13df143122f99a0eb10bfefb216c2806de0
1/******************************************************************************* 2 3 Intel PRO/10GbE Linux driver 4 Copyright(c) 1999 - 2008 Intel Corporation. 5 6 This program is free software; you can redistribute it and/or modify it 7 under the terms and conditions of the GNU General Public License, 8 version 2, as published by the Free Software Foundation. 9 10 This program is distributed in the hope it will be useful, but WITHOUT 11 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 13 more details. 14 15 You should have received a copy of the GNU General Public License along with 16 this program; if not, write to the Free Software Foundation, Inc., 17 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. 18 19 The full GNU General Public License is included in this distribution in 20 the file called "COPYING". 21 22 Contact Information: 23 Linux NICS <linux.nics@intel.com> 24 e1000-devel Mailing List <e1000-devel@lists.sourceforge.net> 25 Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 26 27*******************************************************************************/ 28 29#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 30 31#include <linux/prefetch.h> 32#include "ixgb.h" 33 34char ixgb_driver_name[] = "ixgb"; 35static char ixgb_driver_string[] = "Intel(R) PRO/10GbE Network Driver"; 36 37#define DRIVERNAPI "-NAPI" 38#define DRV_VERSION "1.0.135-k2" DRIVERNAPI 39const char ixgb_driver_version[] = DRV_VERSION; 40static const char ixgb_copyright[] = "Copyright (c) 1999-2008 Intel Corporation."; 41 42#define IXGB_CB_LENGTH 256 43static unsigned int copybreak __read_mostly = IXGB_CB_LENGTH; 44module_param(copybreak, uint, 0644); 45MODULE_PARM_DESC(copybreak, 46 "Maximum size of packet that is copied to a new buffer on receive"); 47 48/* ixgb_pci_tbl - PCI Device ID Table 49 * 50 * Wildcard entries (PCI_ANY_ID) should come last 51 * Last entry must be all 0s 52 * 53 * { Vendor ID, Device ID, SubVendor ID, SubDevice ID, 54 * Class, Class Mask, private data (not used) } 55 */ 56static DEFINE_PCI_DEVICE_TABLE(ixgb_pci_tbl) = { 57 {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX, 58 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0}, 59 {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_CX4, 60 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0}, 61 {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_SR, 62 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0}, 63 {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_LR, 64 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0}, 65 66 /* required last entry */ 67 {0,} 68}; 69 70MODULE_DEVICE_TABLE(pci, ixgb_pci_tbl); 71 72/* Local Function Prototypes */ 73static int ixgb_init_module(void); 74static void ixgb_exit_module(void); 75static int ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent); 76static void __devexit ixgb_remove(struct pci_dev *pdev); 77static int ixgb_sw_init(struct ixgb_adapter *adapter); 78static int ixgb_open(struct net_device *netdev); 79static int ixgb_close(struct net_device *netdev); 80static void ixgb_configure_tx(struct ixgb_adapter *adapter); 81static void ixgb_configure_rx(struct ixgb_adapter *adapter); 82static void ixgb_setup_rctl(struct ixgb_adapter *adapter); 83static void ixgb_clean_tx_ring(struct ixgb_adapter *adapter); 84static void ixgb_clean_rx_ring(struct ixgb_adapter *adapter); 85static void ixgb_set_multi(struct net_device *netdev); 86static void ixgb_watchdog(unsigned long data); 87static netdev_tx_t ixgb_xmit_frame(struct sk_buff *skb, 88 struct net_device *netdev); 89static struct net_device_stats *ixgb_get_stats(struct net_device *netdev); 90static int ixgb_change_mtu(struct net_device *netdev, int new_mtu); 91static int ixgb_set_mac(struct net_device *netdev, void *p); 92static irqreturn_t ixgb_intr(int irq, void *data); 93static bool ixgb_clean_tx_irq(struct ixgb_adapter *adapter); 94 95static int ixgb_clean(struct napi_struct *, int); 96static bool ixgb_clean_rx_irq(struct ixgb_adapter *, int *, int); 97static void ixgb_alloc_rx_buffers(struct ixgb_adapter *, int); 98 99static void ixgb_tx_timeout(struct net_device *dev); 100static void ixgb_tx_timeout_task(struct work_struct *work); 101 102static void ixgb_vlan_strip_enable(struct ixgb_adapter *adapter); 103static void ixgb_vlan_strip_disable(struct ixgb_adapter *adapter); 104static void ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid); 105static void ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid); 106static void ixgb_restore_vlan(struct ixgb_adapter *adapter); 107 108#ifdef CONFIG_NET_POLL_CONTROLLER 109/* for netdump / net console */ 110static void ixgb_netpoll(struct net_device *dev); 111#endif 112 113static pci_ers_result_t ixgb_io_error_detected (struct pci_dev *pdev, 114 enum pci_channel_state state); 115static pci_ers_result_t ixgb_io_slot_reset (struct pci_dev *pdev); 116static void ixgb_io_resume (struct pci_dev *pdev); 117 118static struct pci_error_handlers ixgb_err_handler = { 119 .error_detected = ixgb_io_error_detected, 120 .slot_reset = ixgb_io_slot_reset, 121 .resume = ixgb_io_resume, 122}; 123 124static struct pci_driver ixgb_driver = { 125 .name = ixgb_driver_name, 126 .id_table = ixgb_pci_tbl, 127 .probe = ixgb_probe, 128 .remove = __devexit_p(ixgb_remove), 129 .err_handler = &ixgb_err_handler 130}; 131 132MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>"); 133MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver"); 134MODULE_LICENSE("GPL"); 135MODULE_VERSION(DRV_VERSION); 136 137#define DEFAULT_DEBUG_LEVEL_SHIFT 3 138static int debug = DEFAULT_DEBUG_LEVEL_SHIFT; 139module_param(debug, int, 0); 140MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)"); 141 142/** 143 * ixgb_init_module - Driver Registration Routine 144 * 145 * ixgb_init_module is the first routine called when the driver is 146 * loaded. All it does is register with the PCI subsystem. 147 **/ 148 149static int __init 150ixgb_init_module(void) 151{ 152 pr_info("%s - version %s\n", ixgb_driver_string, ixgb_driver_version); 153 pr_info("%s\n", ixgb_copyright); 154 155 return pci_register_driver(&ixgb_driver); 156} 157 158module_init(ixgb_init_module); 159 160/** 161 * ixgb_exit_module - Driver Exit Cleanup Routine 162 * 163 * ixgb_exit_module is called just before the driver is removed 164 * from memory. 165 **/ 166 167static void __exit 168ixgb_exit_module(void) 169{ 170 pci_unregister_driver(&ixgb_driver); 171} 172 173module_exit(ixgb_exit_module); 174 175/** 176 * ixgb_irq_disable - Mask off interrupt generation on the NIC 177 * @adapter: board private structure 178 **/ 179 180static void 181ixgb_irq_disable(struct ixgb_adapter *adapter) 182{ 183 IXGB_WRITE_REG(&adapter->hw, IMC, ~0); 184 IXGB_WRITE_FLUSH(&adapter->hw); 185 synchronize_irq(adapter->pdev->irq); 186} 187 188/** 189 * ixgb_irq_enable - Enable default interrupt generation settings 190 * @adapter: board private structure 191 **/ 192 193static void 194ixgb_irq_enable(struct ixgb_adapter *adapter) 195{ 196 u32 val = IXGB_INT_RXT0 | IXGB_INT_RXDMT0 | 197 IXGB_INT_TXDW | IXGB_INT_LSC; 198 if (adapter->hw.subsystem_vendor_id == SUN_SUBVENDOR_ID) 199 val |= IXGB_INT_GPI0; 200 IXGB_WRITE_REG(&adapter->hw, IMS, val); 201 IXGB_WRITE_FLUSH(&adapter->hw); 202} 203 204int 205ixgb_up(struct ixgb_adapter *adapter) 206{ 207 struct net_device *netdev = adapter->netdev; 208 int err, irq_flags = IRQF_SHARED; 209 int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH; 210 struct ixgb_hw *hw = &adapter->hw; 211 212 /* hardware has been reset, we need to reload some things */ 213 214 ixgb_rar_set(hw, netdev->dev_addr, 0); 215 ixgb_set_multi(netdev); 216 217 ixgb_restore_vlan(adapter); 218 219 ixgb_configure_tx(adapter); 220 ixgb_setup_rctl(adapter); 221 ixgb_configure_rx(adapter); 222 ixgb_alloc_rx_buffers(adapter, IXGB_DESC_UNUSED(&adapter->rx_ring)); 223 224 /* disable interrupts and get the hardware into a known state */ 225 IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff); 226 227 /* only enable MSI if bus is in PCI-X mode */ 228 if (IXGB_READ_REG(&adapter->hw, STATUS) & IXGB_STATUS_PCIX_MODE) { 229 err = pci_enable_msi(adapter->pdev); 230 if (!err) { 231 adapter->have_msi = 1; 232 irq_flags = 0; 233 } 234 /* proceed to try to request regular interrupt */ 235 } 236 237 err = request_irq(adapter->pdev->irq, ixgb_intr, irq_flags, 238 netdev->name, netdev); 239 if (err) { 240 if (adapter->have_msi) 241 pci_disable_msi(adapter->pdev); 242 netif_err(adapter, probe, adapter->netdev, 243 "Unable to allocate interrupt Error: %d\n", err); 244 return err; 245 } 246 247 if ((hw->max_frame_size != max_frame) || 248 (hw->max_frame_size != 249 (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) { 250 251 hw->max_frame_size = max_frame; 252 253 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT); 254 255 if (hw->max_frame_size > 256 IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) { 257 u32 ctrl0 = IXGB_READ_REG(hw, CTRL0); 258 259 if (!(ctrl0 & IXGB_CTRL0_JFE)) { 260 ctrl0 |= IXGB_CTRL0_JFE; 261 IXGB_WRITE_REG(hw, CTRL0, ctrl0); 262 } 263 } 264 } 265 266 clear_bit(__IXGB_DOWN, &adapter->flags); 267 268 napi_enable(&adapter->napi); 269 ixgb_irq_enable(adapter); 270 271 netif_wake_queue(netdev); 272 273 mod_timer(&adapter->watchdog_timer, jiffies); 274 275 return 0; 276} 277 278void 279ixgb_down(struct ixgb_adapter *adapter, bool kill_watchdog) 280{ 281 struct net_device *netdev = adapter->netdev; 282 283 /* prevent the interrupt handler from restarting watchdog */ 284 set_bit(__IXGB_DOWN, &adapter->flags); 285 286 napi_disable(&adapter->napi); 287 /* waiting for NAPI to complete can re-enable interrupts */ 288 ixgb_irq_disable(adapter); 289 free_irq(adapter->pdev->irq, netdev); 290 291 if (adapter->have_msi) 292 pci_disable_msi(adapter->pdev); 293 294 if (kill_watchdog) 295 del_timer_sync(&adapter->watchdog_timer); 296 297 adapter->link_speed = 0; 298 adapter->link_duplex = 0; 299 netif_carrier_off(netdev); 300 netif_stop_queue(netdev); 301 302 ixgb_reset(adapter); 303 ixgb_clean_tx_ring(adapter); 304 ixgb_clean_rx_ring(adapter); 305} 306 307void 308ixgb_reset(struct ixgb_adapter *adapter) 309{ 310 struct ixgb_hw *hw = &adapter->hw; 311 312 ixgb_adapter_stop(hw); 313 if (!ixgb_init_hw(hw)) 314 netif_err(adapter, probe, adapter->netdev, "ixgb_init_hw failed\n"); 315 316 /* restore frame size information */ 317 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT); 318 if (hw->max_frame_size > 319 IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) { 320 u32 ctrl0 = IXGB_READ_REG(hw, CTRL0); 321 if (!(ctrl0 & IXGB_CTRL0_JFE)) { 322 ctrl0 |= IXGB_CTRL0_JFE; 323 IXGB_WRITE_REG(hw, CTRL0, ctrl0); 324 } 325 } 326} 327 328static const struct net_device_ops ixgb_netdev_ops = { 329 .ndo_open = ixgb_open, 330 .ndo_stop = ixgb_close, 331 .ndo_start_xmit = ixgb_xmit_frame, 332 .ndo_get_stats = ixgb_get_stats, 333 .ndo_set_rx_mode = ixgb_set_multi, 334 .ndo_validate_addr = eth_validate_addr, 335 .ndo_set_mac_address = ixgb_set_mac, 336 .ndo_change_mtu = ixgb_change_mtu, 337 .ndo_tx_timeout = ixgb_tx_timeout, 338 .ndo_vlan_rx_add_vid = ixgb_vlan_rx_add_vid, 339 .ndo_vlan_rx_kill_vid = ixgb_vlan_rx_kill_vid, 340#ifdef CONFIG_NET_POLL_CONTROLLER 341 .ndo_poll_controller = ixgb_netpoll, 342#endif 343}; 344 345/** 346 * ixgb_probe - Device Initialization Routine 347 * @pdev: PCI device information struct 348 * @ent: entry in ixgb_pci_tbl 349 * 350 * Returns 0 on success, negative on failure 351 * 352 * ixgb_probe initializes an adapter identified by a pci_dev structure. 353 * The OS initialization, configuring of the adapter private structure, 354 * and a hardware reset occur. 355 **/ 356 357static int __devinit 358ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent) 359{ 360 struct net_device *netdev = NULL; 361 struct ixgb_adapter *adapter; 362 static int cards_found = 0; 363 int pci_using_dac; 364 int i; 365 int err; 366 367 err = pci_enable_device(pdev); 368 if (err) 369 return err; 370 371 pci_using_dac = 0; 372 err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(64)); 373 if (!err) { 374 err = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64)); 375 if (!err) 376 pci_using_dac = 1; 377 } else { 378 err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32)); 379 if (err) { 380 err = dma_set_coherent_mask(&pdev->dev, 381 DMA_BIT_MASK(32)); 382 if (err) { 383 pr_err("No usable DMA configuration, aborting\n"); 384 goto err_dma_mask; 385 } 386 } 387 } 388 389 err = pci_request_regions(pdev, ixgb_driver_name); 390 if (err) 391 goto err_request_regions; 392 393 pci_set_master(pdev); 394 395 netdev = alloc_etherdev(sizeof(struct ixgb_adapter)); 396 if (!netdev) { 397 err = -ENOMEM; 398 goto err_alloc_etherdev; 399 } 400 401 SET_NETDEV_DEV(netdev, &pdev->dev); 402 403 pci_set_drvdata(pdev, netdev); 404 adapter = netdev_priv(netdev); 405 adapter->netdev = netdev; 406 adapter->pdev = pdev; 407 adapter->hw.back = adapter; 408 adapter->msg_enable = netif_msg_init(debug, DEFAULT_DEBUG_LEVEL_SHIFT); 409 410 adapter->hw.hw_addr = pci_ioremap_bar(pdev, BAR_0); 411 if (!adapter->hw.hw_addr) { 412 err = -EIO; 413 goto err_ioremap; 414 } 415 416 for (i = BAR_1; i <= BAR_5; i++) { 417 if (pci_resource_len(pdev, i) == 0) 418 continue; 419 if (pci_resource_flags(pdev, i) & IORESOURCE_IO) { 420 adapter->hw.io_base = pci_resource_start(pdev, i); 421 break; 422 } 423 } 424 425 netdev->netdev_ops = &ixgb_netdev_ops; 426 ixgb_set_ethtool_ops(netdev); 427 netdev->watchdog_timeo = 5 * HZ; 428 netif_napi_add(netdev, &adapter->napi, ixgb_clean, 64); 429 430 strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1); 431 432 adapter->bd_number = cards_found; 433 adapter->link_speed = 0; 434 adapter->link_duplex = 0; 435 436 /* setup the private structure */ 437 438 err = ixgb_sw_init(adapter); 439 if (err) 440 goto err_sw_init; 441 442 netdev->features = NETIF_F_SG | 443 NETIF_F_HW_CSUM | 444 NETIF_F_HW_VLAN_TX | 445 NETIF_F_HW_VLAN_RX | 446 NETIF_F_HW_VLAN_FILTER; 447 netdev->features |= NETIF_F_TSO; 448 449 if (pci_using_dac) { 450 netdev->features |= NETIF_F_HIGHDMA; 451 netdev->vlan_features |= NETIF_F_HIGHDMA; 452 } 453 454 /* make sure the EEPROM is good */ 455 456 if (!ixgb_validate_eeprom_checksum(&adapter->hw)) { 457 netif_err(adapter, probe, adapter->netdev, 458 "The EEPROM Checksum Is Not Valid\n"); 459 err = -EIO; 460 goto err_eeprom; 461 } 462 463 ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr); 464 memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len); 465 466 if (!is_valid_ether_addr(netdev->perm_addr)) { 467 netif_err(adapter, probe, adapter->netdev, "Invalid MAC Address\n"); 468 err = -EIO; 469 goto err_eeprom; 470 } 471 472 adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw); 473 474 init_timer(&adapter->watchdog_timer); 475 adapter->watchdog_timer.function = ixgb_watchdog; 476 adapter->watchdog_timer.data = (unsigned long)adapter; 477 478 INIT_WORK(&adapter->tx_timeout_task, ixgb_tx_timeout_task); 479 480 strcpy(netdev->name, "eth%d"); 481 err = register_netdev(netdev); 482 if (err) 483 goto err_register; 484 485 /* carrier off reporting is important to ethtool even BEFORE open */ 486 netif_carrier_off(netdev); 487 488 netif_info(adapter, probe, adapter->netdev, 489 "Intel(R) PRO/10GbE Network Connection\n"); 490 ixgb_check_options(adapter); 491 /* reset the hardware with the new settings */ 492 493 ixgb_reset(adapter); 494 495 cards_found++; 496 return 0; 497 498err_register: 499err_sw_init: 500err_eeprom: 501 iounmap(adapter->hw.hw_addr); 502err_ioremap: 503 free_netdev(netdev); 504err_alloc_etherdev: 505 pci_release_regions(pdev); 506err_request_regions: 507err_dma_mask: 508 pci_disable_device(pdev); 509 return err; 510} 511 512/** 513 * ixgb_remove - Device Removal Routine 514 * @pdev: PCI device information struct 515 * 516 * ixgb_remove is called by the PCI subsystem to alert the driver 517 * that it should release a PCI device. The could be caused by a 518 * Hot-Plug event, or because the driver is going to be removed from 519 * memory. 520 **/ 521 522static void __devexit 523ixgb_remove(struct pci_dev *pdev) 524{ 525 struct net_device *netdev = pci_get_drvdata(pdev); 526 struct ixgb_adapter *adapter = netdev_priv(netdev); 527 528 cancel_work_sync(&adapter->tx_timeout_task); 529 530 unregister_netdev(netdev); 531 532 iounmap(adapter->hw.hw_addr); 533 pci_release_regions(pdev); 534 535 free_netdev(netdev); 536 pci_disable_device(pdev); 537} 538 539/** 540 * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter) 541 * @adapter: board private structure to initialize 542 * 543 * ixgb_sw_init initializes the Adapter private data structure. 544 * Fields are initialized based on PCI device information and 545 * OS network device settings (MTU size). 546 **/ 547 548static int __devinit 549ixgb_sw_init(struct ixgb_adapter *adapter) 550{ 551 struct ixgb_hw *hw = &adapter->hw; 552 struct net_device *netdev = adapter->netdev; 553 struct pci_dev *pdev = adapter->pdev; 554 555 /* PCI config space info */ 556 557 hw->vendor_id = pdev->vendor; 558 hw->device_id = pdev->device; 559 hw->subsystem_vendor_id = pdev->subsystem_vendor; 560 hw->subsystem_id = pdev->subsystem_device; 561 562 hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH; 563 adapter->rx_buffer_len = hw->max_frame_size + 8; /* + 8 for errata */ 564 565 if ((hw->device_id == IXGB_DEVICE_ID_82597EX) || 566 (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4) || 567 (hw->device_id == IXGB_DEVICE_ID_82597EX_LR) || 568 (hw->device_id == IXGB_DEVICE_ID_82597EX_SR)) 569 hw->mac_type = ixgb_82597; 570 else { 571 /* should never have loaded on this device */ 572 netif_err(adapter, probe, adapter->netdev, "unsupported device id\n"); 573 } 574 575 /* enable flow control to be programmed */ 576 hw->fc.send_xon = 1; 577 578 set_bit(__IXGB_DOWN, &adapter->flags); 579 return 0; 580} 581 582/** 583 * ixgb_open - Called when a network interface is made active 584 * @netdev: network interface device structure 585 * 586 * Returns 0 on success, negative value on failure 587 * 588 * The open entry point is called when a network interface is made 589 * active by the system (IFF_UP). At this point all resources needed 590 * for transmit and receive operations are allocated, the interrupt 591 * handler is registered with the OS, the watchdog timer is started, 592 * and the stack is notified that the interface is ready. 593 **/ 594 595static int 596ixgb_open(struct net_device *netdev) 597{ 598 struct ixgb_adapter *adapter = netdev_priv(netdev); 599 int err; 600 601 /* allocate transmit descriptors */ 602 err = ixgb_setup_tx_resources(adapter); 603 if (err) 604 goto err_setup_tx; 605 606 netif_carrier_off(netdev); 607 608 /* allocate receive descriptors */ 609 610 err = ixgb_setup_rx_resources(adapter); 611 if (err) 612 goto err_setup_rx; 613 614 err = ixgb_up(adapter); 615 if (err) 616 goto err_up; 617 618 netif_start_queue(netdev); 619 620 return 0; 621 622err_up: 623 ixgb_free_rx_resources(adapter); 624err_setup_rx: 625 ixgb_free_tx_resources(adapter); 626err_setup_tx: 627 ixgb_reset(adapter); 628 629 return err; 630} 631 632/** 633 * ixgb_close - Disables a network interface 634 * @netdev: network interface device structure 635 * 636 * Returns 0, this is not allowed to fail 637 * 638 * The close entry point is called when an interface is de-activated 639 * by the OS. The hardware is still under the drivers control, but 640 * needs to be disabled. A global MAC reset is issued to stop the 641 * hardware, and all transmit and receive resources are freed. 642 **/ 643 644static int 645ixgb_close(struct net_device *netdev) 646{ 647 struct ixgb_adapter *adapter = netdev_priv(netdev); 648 649 ixgb_down(adapter, true); 650 651 ixgb_free_tx_resources(adapter); 652 ixgb_free_rx_resources(adapter); 653 654 return 0; 655} 656 657/** 658 * ixgb_setup_tx_resources - allocate Tx resources (Descriptors) 659 * @adapter: board private structure 660 * 661 * Return 0 on success, negative on failure 662 **/ 663 664int 665ixgb_setup_tx_resources(struct ixgb_adapter *adapter) 666{ 667 struct ixgb_desc_ring *txdr = &adapter->tx_ring; 668 struct pci_dev *pdev = adapter->pdev; 669 int size; 670 671 size = sizeof(struct ixgb_buffer) * txdr->count; 672 txdr->buffer_info = vzalloc(size); 673 if (!txdr->buffer_info) { 674 netif_err(adapter, probe, adapter->netdev, 675 "Unable to allocate transmit descriptor ring memory\n"); 676 return -ENOMEM; 677 } 678 679 /* round up to nearest 4K */ 680 681 txdr->size = txdr->count * sizeof(struct ixgb_tx_desc); 682 txdr->size = ALIGN(txdr->size, 4096); 683 684 txdr->desc = dma_alloc_coherent(&pdev->dev, txdr->size, &txdr->dma, 685 GFP_KERNEL); 686 if (!txdr->desc) { 687 vfree(txdr->buffer_info); 688 netif_err(adapter, probe, adapter->netdev, 689 "Unable to allocate transmit descriptor memory\n"); 690 return -ENOMEM; 691 } 692 memset(txdr->desc, 0, txdr->size); 693 694 txdr->next_to_use = 0; 695 txdr->next_to_clean = 0; 696 697 return 0; 698} 699 700/** 701 * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset. 702 * @adapter: board private structure 703 * 704 * Configure the Tx unit of the MAC after a reset. 705 **/ 706 707static void 708ixgb_configure_tx(struct ixgb_adapter *adapter) 709{ 710 u64 tdba = adapter->tx_ring.dma; 711 u32 tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc); 712 u32 tctl; 713 struct ixgb_hw *hw = &adapter->hw; 714 715 /* Setup the Base and Length of the Tx Descriptor Ring 716 * tx_ring.dma can be either a 32 or 64 bit value 717 */ 718 719 IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL)); 720 IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32)); 721 722 IXGB_WRITE_REG(hw, TDLEN, tdlen); 723 724 /* Setup the HW Tx Head and Tail descriptor pointers */ 725 726 IXGB_WRITE_REG(hw, TDH, 0); 727 IXGB_WRITE_REG(hw, TDT, 0); 728 729 /* don't set up txdctl, it induces performance problems if configured 730 * incorrectly */ 731 /* Set the Tx Interrupt Delay register */ 732 733 IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay); 734 735 /* Program the Transmit Control Register */ 736 737 tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE; 738 IXGB_WRITE_REG(hw, TCTL, tctl); 739 740 /* Setup Transmit Descriptor Settings for this adapter */ 741 adapter->tx_cmd_type = 742 IXGB_TX_DESC_TYPE | 743 (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0); 744} 745 746/** 747 * ixgb_setup_rx_resources - allocate Rx resources (Descriptors) 748 * @adapter: board private structure 749 * 750 * Returns 0 on success, negative on failure 751 **/ 752 753int 754ixgb_setup_rx_resources(struct ixgb_adapter *adapter) 755{ 756 struct ixgb_desc_ring *rxdr = &adapter->rx_ring; 757 struct pci_dev *pdev = adapter->pdev; 758 int size; 759 760 size = sizeof(struct ixgb_buffer) * rxdr->count; 761 rxdr->buffer_info = vzalloc(size); 762 if (!rxdr->buffer_info) { 763 netif_err(adapter, probe, adapter->netdev, 764 "Unable to allocate receive descriptor ring\n"); 765 return -ENOMEM; 766 } 767 768 /* Round up to nearest 4K */ 769 770 rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc); 771 rxdr->size = ALIGN(rxdr->size, 4096); 772 773 rxdr->desc = dma_alloc_coherent(&pdev->dev, rxdr->size, &rxdr->dma, 774 GFP_KERNEL); 775 776 if (!rxdr->desc) { 777 vfree(rxdr->buffer_info); 778 netif_err(adapter, probe, adapter->netdev, 779 "Unable to allocate receive descriptors\n"); 780 return -ENOMEM; 781 } 782 memset(rxdr->desc, 0, rxdr->size); 783 784 rxdr->next_to_clean = 0; 785 rxdr->next_to_use = 0; 786 787 return 0; 788} 789 790/** 791 * ixgb_setup_rctl - configure the receive control register 792 * @adapter: Board private structure 793 **/ 794 795static void 796ixgb_setup_rctl(struct ixgb_adapter *adapter) 797{ 798 u32 rctl; 799 800 rctl = IXGB_READ_REG(&adapter->hw, RCTL); 801 802 rctl &= ~(3 << IXGB_RCTL_MO_SHIFT); 803 804 rctl |= 805 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 | 806 IXGB_RCTL_RXEN | IXGB_RCTL_CFF | 807 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT); 808 809 rctl |= IXGB_RCTL_SECRC; 810 811 if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048) 812 rctl |= IXGB_RCTL_BSIZE_2048; 813 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096) 814 rctl |= IXGB_RCTL_BSIZE_4096; 815 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192) 816 rctl |= IXGB_RCTL_BSIZE_8192; 817 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384) 818 rctl |= IXGB_RCTL_BSIZE_16384; 819 820 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl); 821} 822 823/** 824 * ixgb_configure_rx - Configure 82597 Receive Unit after Reset. 825 * @adapter: board private structure 826 * 827 * Configure the Rx unit of the MAC after a reset. 828 **/ 829 830static void 831ixgb_configure_rx(struct ixgb_adapter *adapter) 832{ 833 u64 rdba = adapter->rx_ring.dma; 834 u32 rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc); 835 struct ixgb_hw *hw = &adapter->hw; 836 u32 rctl; 837 u32 rxcsum; 838 839 /* make sure receives are disabled while setting up the descriptors */ 840 841 rctl = IXGB_READ_REG(hw, RCTL); 842 IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN); 843 844 /* set the Receive Delay Timer Register */ 845 846 IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay); 847 848 /* Setup the Base and Length of the Rx Descriptor Ring */ 849 850 IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL)); 851 IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32)); 852 853 IXGB_WRITE_REG(hw, RDLEN, rdlen); 854 855 /* Setup the HW Rx Head and Tail Descriptor Pointers */ 856 IXGB_WRITE_REG(hw, RDH, 0); 857 IXGB_WRITE_REG(hw, RDT, 0); 858 859 /* due to the hardware errata with RXDCTL, we are unable to use any of 860 * the performance enhancing features of it without causing other 861 * subtle bugs, some of the bugs could include receive length 862 * corruption at high data rates (WTHRESH > 0) and/or receive 863 * descriptor ring irregularites (particularly in hardware cache) */ 864 IXGB_WRITE_REG(hw, RXDCTL, 0); 865 866 /* Enable Receive Checksum Offload for TCP and UDP */ 867 if (adapter->rx_csum) { 868 rxcsum = IXGB_READ_REG(hw, RXCSUM); 869 rxcsum |= IXGB_RXCSUM_TUOFL; 870 IXGB_WRITE_REG(hw, RXCSUM, rxcsum); 871 } 872 873 /* Enable Receives */ 874 875 IXGB_WRITE_REG(hw, RCTL, rctl); 876} 877 878/** 879 * ixgb_free_tx_resources - Free Tx Resources 880 * @adapter: board private structure 881 * 882 * Free all transmit software resources 883 **/ 884 885void 886ixgb_free_tx_resources(struct ixgb_adapter *adapter) 887{ 888 struct pci_dev *pdev = adapter->pdev; 889 890 ixgb_clean_tx_ring(adapter); 891 892 vfree(adapter->tx_ring.buffer_info); 893 adapter->tx_ring.buffer_info = NULL; 894 895 dma_free_coherent(&pdev->dev, adapter->tx_ring.size, 896 adapter->tx_ring.desc, adapter->tx_ring.dma); 897 898 adapter->tx_ring.desc = NULL; 899} 900 901static void 902ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter, 903 struct ixgb_buffer *buffer_info) 904{ 905 if (buffer_info->dma) { 906 if (buffer_info->mapped_as_page) 907 dma_unmap_page(&adapter->pdev->dev, buffer_info->dma, 908 buffer_info->length, DMA_TO_DEVICE); 909 else 910 dma_unmap_single(&adapter->pdev->dev, buffer_info->dma, 911 buffer_info->length, DMA_TO_DEVICE); 912 buffer_info->dma = 0; 913 } 914 915 if (buffer_info->skb) { 916 dev_kfree_skb_any(buffer_info->skb); 917 buffer_info->skb = NULL; 918 } 919 buffer_info->time_stamp = 0; 920 /* these fields must always be initialized in tx 921 * buffer_info->length = 0; 922 * buffer_info->next_to_watch = 0; */ 923} 924 925/** 926 * ixgb_clean_tx_ring - Free Tx Buffers 927 * @adapter: board private structure 928 **/ 929 930static void 931ixgb_clean_tx_ring(struct ixgb_adapter *adapter) 932{ 933 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring; 934 struct ixgb_buffer *buffer_info; 935 unsigned long size; 936 unsigned int i; 937 938 /* Free all the Tx ring sk_buffs */ 939 940 for (i = 0; i < tx_ring->count; i++) { 941 buffer_info = &tx_ring->buffer_info[i]; 942 ixgb_unmap_and_free_tx_resource(adapter, buffer_info); 943 } 944 945 size = sizeof(struct ixgb_buffer) * tx_ring->count; 946 memset(tx_ring->buffer_info, 0, size); 947 948 /* Zero out the descriptor ring */ 949 950 memset(tx_ring->desc, 0, tx_ring->size); 951 952 tx_ring->next_to_use = 0; 953 tx_ring->next_to_clean = 0; 954 955 IXGB_WRITE_REG(&adapter->hw, TDH, 0); 956 IXGB_WRITE_REG(&adapter->hw, TDT, 0); 957} 958 959/** 960 * ixgb_free_rx_resources - Free Rx Resources 961 * @adapter: board private structure 962 * 963 * Free all receive software resources 964 **/ 965 966void 967ixgb_free_rx_resources(struct ixgb_adapter *adapter) 968{ 969 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring; 970 struct pci_dev *pdev = adapter->pdev; 971 972 ixgb_clean_rx_ring(adapter); 973 974 vfree(rx_ring->buffer_info); 975 rx_ring->buffer_info = NULL; 976 977 dma_free_coherent(&pdev->dev, rx_ring->size, rx_ring->desc, 978 rx_ring->dma); 979 980 rx_ring->desc = NULL; 981} 982 983/** 984 * ixgb_clean_rx_ring - Free Rx Buffers 985 * @adapter: board private structure 986 **/ 987 988static void 989ixgb_clean_rx_ring(struct ixgb_adapter *adapter) 990{ 991 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring; 992 struct ixgb_buffer *buffer_info; 993 struct pci_dev *pdev = adapter->pdev; 994 unsigned long size; 995 unsigned int i; 996 997 /* Free all the Rx ring sk_buffs */ 998 999 for (i = 0; i < rx_ring->count; i++) { 1000 buffer_info = &rx_ring->buffer_info[i]; 1001 if (buffer_info->dma) { 1002 dma_unmap_single(&pdev->dev, 1003 buffer_info->dma, 1004 buffer_info->length, 1005 DMA_FROM_DEVICE); 1006 buffer_info->dma = 0; 1007 buffer_info->length = 0; 1008 } 1009 1010 if (buffer_info->skb) { 1011 dev_kfree_skb(buffer_info->skb); 1012 buffer_info->skb = NULL; 1013 } 1014 } 1015 1016 size = sizeof(struct ixgb_buffer) * rx_ring->count; 1017 memset(rx_ring->buffer_info, 0, size); 1018 1019 /* Zero out the descriptor ring */ 1020 1021 memset(rx_ring->desc, 0, rx_ring->size); 1022 1023 rx_ring->next_to_clean = 0; 1024 rx_ring->next_to_use = 0; 1025 1026 IXGB_WRITE_REG(&adapter->hw, RDH, 0); 1027 IXGB_WRITE_REG(&adapter->hw, RDT, 0); 1028} 1029 1030/** 1031 * ixgb_set_mac - Change the Ethernet Address of the NIC 1032 * @netdev: network interface device structure 1033 * @p: pointer to an address structure 1034 * 1035 * Returns 0 on success, negative on failure 1036 **/ 1037 1038static int 1039ixgb_set_mac(struct net_device *netdev, void *p) 1040{ 1041 struct ixgb_adapter *adapter = netdev_priv(netdev); 1042 struct sockaddr *addr = p; 1043 1044 if (!is_valid_ether_addr(addr->sa_data)) 1045 return -EADDRNOTAVAIL; 1046 1047 memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len); 1048 1049 ixgb_rar_set(&adapter->hw, addr->sa_data, 0); 1050 1051 return 0; 1052} 1053 1054/** 1055 * ixgb_set_multi - Multicast and Promiscuous mode set 1056 * @netdev: network interface device structure 1057 * 1058 * The set_multi entry point is called whenever the multicast address 1059 * list or the network interface flags are updated. This routine is 1060 * responsible for configuring the hardware for proper multicast, 1061 * promiscuous mode, and all-multi behavior. 1062 **/ 1063 1064static void 1065ixgb_set_multi(struct net_device *netdev) 1066{ 1067 struct ixgb_adapter *adapter = netdev_priv(netdev); 1068 struct ixgb_hw *hw = &adapter->hw; 1069 struct netdev_hw_addr *ha; 1070 u32 rctl; 1071 int i; 1072 1073 /* Check for Promiscuous and All Multicast modes */ 1074 1075 rctl = IXGB_READ_REG(hw, RCTL); 1076 1077 if (netdev->flags & IFF_PROMISC) { 1078 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE); 1079 /* disable VLAN filtering */ 1080 rctl &= ~IXGB_RCTL_CFIEN; 1081 rctl &= ~IXGB_RCTL_VFE; 1082 } else { 1083 if (netdev->flags & IFF_ALLMULTI) { 1084 rctl |= IXGB_RCTL_MPE; 1085 rctl &= ~IXGB_RCTL_UPE; 1086 } else { 1087 rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE); 1088 } 1089 /* enable VLAN filtering */ 1090 rctl |= IXGB_RCTL_VFE; 1091 rctl &= ~IXGB_RCTL_CFIEN; 1092 } 1093 1094 if (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES) { 1095 rctl |= IXGB_RCTL_MPE; 1096 IXGB_WRITE_REG(hw, RCTL, rctl); 1097 } else { 1098 u8 mta[IXGB_MAX_NUM_MULTICAST_ADDRESSES * 1099 IXGB_ETH_LENGTH_OF_ADDRESS]; 1100 1101 IXGB_WRITE_REG(hw, RCTL, rctl); 1102 1103 i = 0; 1104 netdev_for_each_mc_addr(ha, netdev) 1105 memcpy(&mta[i++ * IXGB_ETH_LENGTH_OF_ADDRESS], 1106 ha->addr, IXGB_ETH_LENGTH_OF_ADDRESS); 1107 1108 ixgb_mc_addr_list_update(hw, mta, netdev_mc_count(netdev), 0); 1109 } 1110 1111 if (netdev->features & NETIF_F_HW_VLAN_RX) 1112 ixgb_vlan_strip_enable(adapter); 1113 else 1114 ixgb_vlan_strip_disable(adapter); 1115 1116} 1117 1118/** 1119 * ixgb_watchdog - Timer Call-back 1120 * @data: pointer to netdev cast into an unsigned long 1121 **/ 1122 1123static void 1124ixgb_watchdog(unsigned long data) 1125{ 1126 struct ixgb_adapter *adapter = (struct ixgb_adapter *)data; 1127 struct net_device *netdev = adapter->netdev; 1128 struct ixgb_desc_ring *txdr = &adapter->tx_ring; 1129 1130 ixgb_check_for_link(&adapter->hw); 1131 1132 if (ixgb_check_for_bad_link(&adapter->hw)) { 1133 /* force the reset path */ 1134 netif_stop_queue(netdev); 1135 } 1136 1137 if (adapter->hw.link_up) { 1138 if (!netif_carrier_ok(netdev)) { 1139 netdev_info(netdev, 1140 "NIC Link is Up 10 Gbps Full Duplex, Flow Control: %s\n", 1141 (adapter->hw.fc.type == ixgb_fc_full) ? 1142 "RX/TX" : 1143 (adapter->hw.fc.type == ixgb_fc_rx_pause) ? 1144 "RX" : 1145 (adapter->hw.fc.type == ixgb_fc_tx_pause) ? 1146 "TX" : "None"); 1147 adapter->link_speed = 10000; 1148 adapter->link_duplex = FULL_DUPLEX; 1149 netif_carrier_on(netdev); 1150 } 1151 } else { 1152 if (netif_carrier_ok(netdev)) { 1153 adapter->link_speed = 0; 1154 adapter->link_duplex = 0; 1155 netdev_info(netdev, "NIC Link is Down\n"); 1156 netif_carrier_off(netdev); 1157 } 1158 } 1159 1160 ixgb_update_stats(adapter); 1161 1162 if (!netif_carrier_ok(netdev)) { 1163 if (IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) { 1164 /* We've lost link, so the controller stops DMA, 1165 * but we've got queued Tx work that's never going 1166 * to get done, so reset controller to flush Tx. 1167 * (Do the reset outside of interrupt context). */ 1168 schedule_work(&adapter->tx_timeout_task); 1169 /* return immediately since reset is imminent */ 1170 return; 1171 } 1172 } 1173 1174 /* Force detection of hung controller every watchdog period */ 1175 adapter->detect_tx_hung = true; 1176 1177 /* generate an interrupt to force clean up of any stragglers */ 1178 IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW); 1179 1180 /* Reset the timer */ 1181 mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ); 1182} 1183 1184#define IXGB_TX_FLAGS_CSUM 0x00000001 1185#define IXGB_TX_FLAGS_VLAN 0x00000002 1186#define IXGB_TX_FLAGS_TSO 0x00000004 1187 1188static int 1189ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb) 1190{ 1191 struct ixgb_context_desc *context_desc; 1192 unsigned int i; 1193 u8 ipcss, ipcso, tucss, tucso, hdr_len; 1194 u16 ipcse, tucse, mss; 1195 int err; 1196 1197 if (likely(skb_is_gso(skb))) { 1198 struct ixgb_buffer *buffer_info; 1199 struct iphdr *iph; 1200 1201 if (skb_header_cloned(skb)) { 1202 err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC); 1203 if (err) 1204 return err; 1205 } 1206 1207 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb); 1208 mss = skb_shinfo(skb)->gso_size; 1209 iph = ip_hdr(skb); 1210 iph->tot_len = 0; 1211 iph->check = 0; 1212 tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr, 1213 iph->daddr, 0, 1214 IPPROTO_TCP, 0); 1215 ipcss = skb_network_offset(skb); 1216 ipcso = (void *)&(iph->check) - (void *)skb->data; 1217 ipcse = skb_transport_offset(skb) - 1; 1218 tucss = skb_transport_offset(skb); 1219 tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data; 1220 tucse = 0; 1221 1222 i = adapter->tx_ring.next_to_use; 1223 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i); 1224 buffer_info = &adapter->tx_ring.buffer_info[i]; 1225 WARN_ON(buffer_info->dma != 0); 1226 1227 context_desc->ipcss = ipcss; 1228 context_desc->ipcso = ipcso; 1229 context_desc->ipcse = cpu_to_le16(ipcse); 1230 context_desc->tucss = tucss; 1231 context_desc->tucso = tucso; 1232 context_desc->tucse = cpu_to_le16(tucse); 1233 context_desc->mss = cpu_to_le16(mss); 1234 context_desc->hdr_len = hdr_len; 1235 context_desc->status = 0; 1236 context_desc->cmd_type_len = cpu_to_le32( 1237 IXGB_CONTEXT_DESC_TYPE 1238 | IXGB_CONTEXT_DESC_CMD_TSE 1239 | IXGB_CONTEXT_DESC_CMD_IP 1240 | IXGB_CONTEXT_DESC_CMD_TCP 1241 | IXGB_CONTEXT_DESC_CMD_IDE 1242 | (skb->len - (hdr_len))); 1243 1244 1245 if (++i == adapter->tx_ring.count) i = 0; 1246 adapter->tx_ring.next_to_use = i; 1247 1248 return 1; 1249 } 1250 1251 return 0; 1252} 1253 1254static bool 1255ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb) 1256{ 1257 struct ixgb_context_desc *context_desc; 1258 unsigned int i; 1259 u8 css, cso; 1260 1261 if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) { 1262 struct ixgb_buffer *buffer_info; 1263 css = skb_checksum_start_offset(skb); 1264 cso = css + skb->csum_offset; 1265 1266 i = adapter->tx_ring.next_to_use; 1267 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i); 1268 buffer_info = &adapter->tx_ring.buffer_info[i]; 1269 WARN_ON(buffer_info->dma != 0); 1270 1271 context_desc->tucss = css; 1272 context_desc->tucso = cso; 1273 context_desc->tucse = 0; 1274 /* zero out any previously existing data in one instruction */ 1275 *(u32 *)&(context_desc->ipcss) = 0; 1276 context_desc->status = 0; 1277 context_desc->hdr_len = 0; 1278 context_desc->mss = 0; 1279 context_desc->cmd_type_len = 1280 cpu_to_le32(IXGB_CONTEXT_DESC_TYPE 1281 | IXGB_TX_DESC_CMD_IDE); 1282 1283 if (++i == adapter->tx_ring.count) i = 0; 1284 adapter->tx_ring.next_to_use = i; 1285 1286 return true; 1287 } 1288 1289 return false; 1290} 1291 1292#define IXGB_MAX_TXD_PWR 14 1293#define IXGB_MAX_DATA_PER_TXD (1<<IXGB_MAX_TXD_PWR) 1294 1295static int 1296ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb, 1297 unsigned int first) 1298{ 1299 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring; 1300 struct pci_dev *pdev = adapter->pdev; 1301 struct ixgb_buffer *buffer_info; 1302 int len = skb_headlen(skb); 1303 unsigned int offset = 0, size, count = 0, i; 1304 unsigned int mss = skb_shinfo(skb)->gso_size; 1305 unsigned int nr_frags = skb_shinfo(skb)->nr_frags; 1306 unsigned int f; 1307 1308 i = tx_ring->next_to_use; 1309 1310 while (len) { 1311 buffer_info = &tx_ring->buffer_info[i]; 1312 size = min(len, IXGB_MAX_DATA_PER_TXD); 1313 /* Workaround for premature desc write-backs 1314 * in TSO mode. Append 4-byte sentinel desc */ 1315 if (unlikely(mss && !nr_frags && size == len && size > 8)) 1316 size -= 4; 1317 1318 buffer_info->length = size; 1319 WARN_ON(buffer_info->dma != 0); 1320 buffer_info->time_stamp = jiffies; 1321 buffer_info->mapped_as_page = false; 1322 buffer_info->dma = dma_map_single(&pdev->dev, 1323 skb->data + offset, 1324 size, DMA_TO_DEVICE); 1325 if (dma_mapping_error(&pdev->dev, buffer_info->dma)) 1326 goto dma_error; 1327 buffer_info->next_to_watch = 0; 1328 1329 len -= size; 1330 offset += size; 1331 count++; 1332 if (len) { 1333 i++; 1334 if (i == tx_ring->count) 1335 i = 0; 1336 } 1337 } 1338 1339 for (f = 0; f < nr_frags; f++) { 1340 struct skb_frag_struct *frag; 1341 1342 frag = &skb_shinfo(skb)->frags[f]; 1343 len = frag->size; 1344 offset = frag->page_offset; 1345 1346 while (len) { 1347 i++; 1348 if (i == tx_ring->count) 1349 i = 0; 1350 1351 buffer_info = &tx_ring->buffer_info[i]; 1352 size = min(len, IXGB_MAX_DATA_PER_TXD); 1353 1354 /* Workaround for premature desc write-backs 1355 * in TSO mode. Append 4-byte sentinel desc */ 1356 if (unlikely(mss && (f == (nr_frags - 1)) 1357 && size == len && size > 8)) 1358 size -= 4; 1359 1360 buffer_info->length = size; 1361 buffer_info->time_stamp = jiffies; 1362 buffer_info->mapped_as_page = true; 1363 buffer_info->dma = 1364 dma_map_page(&pdev->dev, frag->page, 1365 offset, size, DMA_TO_DEVICE); 1366 if (dma_mapping_error(&pdev->dev, buffer_info->dma)) 1367 goto dma_error; 1368 buffer_info->next_to_watch = 0; 1369 1370 len -= size; 1371 offset += size; 1372 count++; 1373 } 1374 } 1375 tx_ring->buffer_info[i].skb = skb; 1376 tx_ring->buffer_info[first].next_to_watch = i; 1377 1378 return count; 1379 1380dma_error: 1381 dev_err(&pdev->dev, "TX DMA map failed\n"); 1382 buffer_info->dma = 0; 1383 if (count) 1384 count--; 1385 1386 while (count--) { 1387 if (i==0) 1388 i += tx_ring->count; 1389 i--; 1390 buffer_info = &tx_ring->buffer_info[i]; 1391 ixgb_unmap_and_free_tx_resource(adapter, buffer_info); 1392 } 1393 1394 return 0; 1395} 1396 1397static void 1398ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags) 1399{ 1400 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring; 1401 struct ixgb_tx_desc *tx_desc = NULL; 1402 struct ixgb_buffer *buffer_info; 1403 u32 cmd_type_len = adapter->tx_cmd_type; 1404 u8 status = 0; 1405 u8 popts = 0; 1406 unsigned int i; 1407 1408 if (tx_flags & IXGB_TX_FLAGS_TSO) { 1409 cmd_type_len |= IXGB_TX_DESC_CMD_TSE; 1410 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM); 1411 } 1412 1413 if (tx_flags & IXGB_TX_FLAGS_CSUM) 1414 popts |= IXGB_TX_DESC_POPTS_TXSM; 1415 1416 if (tx_flags & IXGB_TX_FLAGS_VLAN) 1417 cmd_type_len |= IXGB_TX_DESC_CMD_VLE; 1418 1419 i = tx_ring->next_to_use; 1420 1421 while (count--) { 1422 buffer_info = &tx_ring->buffer_info[i]; 1423 tx_desc = IXGB_TX_DESC(*tx_ring, i); 1424 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma); 1425 tx_desc->cmd_type_len = 1426 cpu_to_le32(cmd_type_len | buffer_info->length); 1427 tx_desc->status = status; 1428 tx_desc->popts = popts; 1429 tx_desc->vlan = cpu_to_le16(vlan_id); 1430 1431 if (++i == tx_ring->count) i = 0; 1432 } 1433 1434 tx_desc->cmd_type_len |= 1435 cpu_to_le32(IXGB_TX_DESC_CMD_EOP | IXGB_TX_DESC_CMD_RS); 1436 1437 /* Force memory writes to complete before letting h/w 1438 * know there are new descriptors to fetch. (Only 1439 * applicable for weak-ordered memory model archs, 1440 * such as IA-64). */ 1441 wmb(); 1442 1443 tx_ring->next_to_use = i; 1444 IXGB_WRITE_REG(&adapter->hw, TDT, i); 1445} 1446 1447static int __ixgb_maybe_stop_tx(struct net_device *netdev, int size) 1448{ 1449 struct ixgb_adapter *adapter = netdev_priv(netdev); 1450 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring; 1451 1452 netif_stop_queue(netdev); 1453 /* Herbert's original patch had: 1454 * smp_mb__after_netif_stop_queue(); 1455 * but since that doesn't exist yet, just open code it. */ 1456 smp_mb(); 1457 1458 /* We need to check again in a case another CPU has just 1459 * made room available. */ 1460 if (likely(IXGB_DESC_UNUSED(tx_ring) < size)) 1461 return -EBUSY; 1462 1463 /* A reprieve! */ 1464 netif_start_queue(netdev); 1465 ++adapter->restart_queue; 1466 return 0; 1467} 1468 1469static int ixgb_maybe_stop_tx(struct net_device *netdev, 1470 struct ixgb_desc_ring *tx_ring, int size) 1471{ 1472 if (likely(IXGB_DESC_UNUSED(tx_ring) >= size)) 1473 return 0; 1474 return __ixgb_maybe_stop_tx(netdev, size); 1475} 1476 1477 1478/* Tx Descriptors needed, worst case */ 1479#define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \ 1480 (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0)) 1481#define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) /* skb->date */ + \ 1482 MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 /* for context */ \ 1483 + 1 /* one more needed for sentinel TSO workaround */ 1484 1485static netdev_tx_t 1486ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev) 1487{ 1488 struct ixgb_adapter *adapter = netdev_priv(netdev); 1489 unsigned int first; 1490 unsigned int tx_flags = 0; 1491 int vlan_id = 0; 1492 int count = 0; 1493 int tso; 1494 1495 if (test_bit(__IXGB_DOWN, &adapter->flags)) { 1496 dev_kfree_skb(skb); 1497 return NETDEV_TX_OK; 1498 } 1499 1500 if (skb->len <= 0) { 1501 dev_kfree_skb(skb); 1502 return NETDEV_TX_OK; 1503 } 1504 1505 if (unlikely(ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, 1506 DESC_NEEDED))) 1507 return NETDEV_TX_BUSY; 1508 1509 if (vlan_tx_tag_present(skb)) { 1510 tx_flags |= IXGB_TX_FLAGS_VLAN; 1511 vlan_id = vlan_tx_tag_get(skb); 1512 } 1513 1514 first = adapter->tx_ring.next_to_use; 1515 1516 tso = ixgb_tso(adapter, skb); 1517 if (tso < 0) { 1518 dev_kfree_skb(skb); 1519 return NETDEV_TX_OK; 1520 } 1521 1522 if (likely(tso)) 1523 tx_flags |= IXGB_TX_FLAGS_TSO; 1524 else if (ixgb_tx_csum(adapter, skb)) 1525 tx_flags |= IXGB_TX_FLAGS_CSUM; 1526 1527 count = ixgb_tx_map(adapter, skb, first); 1528 1529 if (count) { 1530 ixgb_tx_queue(adapter, count, vlan_id, tx_flags); 1531 /* Make sure there is space in the ring for the next send. */ 1532 ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED); 1533 1534 } else { 1535 dev_kfree_skb_any(skb); 1536 adapter->tx_ring.buffer_info[first].time_stamp = 0; 1537 adapter->tx_ring.next_to_use = first; 1538 } 1539 1540 return NETDEV_TX_OK; 1541} 1542 1543/** 1544 * ixgb_tx_timeout - Respond to a Tx Hang 1545 * @netdev: network interface device structure 1546 **/ 1547 1548static void 1549ixgb_tx_timeout(struct net_device *netdev) 1550{ 1551 struct ixgb_adapter *adapter = netdev_priv(netdev); 1552 1553 /* Do the reset outside of interrupt context */ 1554 schedule_work(&adapter->tx_timeout_task); 1555} 1556 1557static void 1558ixgb_tx_timeout_task(struct work_struct *work) 1559{ 1560 struct ixgb_adapter *adapter = 1561 container_of(work, struct ixgb_adapter, tx_timeout_task); 1562 1563 adapter->tx_timeout_count++; 1564 ixgb_down(adapter, true); 1565 ixgb_up(adapter); 1566} 1567 1568/** 1569 * ixgb_get_stats - Get System Network Statistics 1570 * @netdev: network interface device structure 1571 * 1572 * Returns the address of the device statistics structure. 1573 * The statistics are actually updated from the timer callback. 1574 **/ 1575 1576static struct net_device_stats * 1577ixgb_get_stats(struct net_device *netdev) 1578{ 1579 return &netdev->stats; 1580} 1581 1582/** 1583 * ixgb_change_mtu - Change the Maximum Transfer Unit 1584 * @netdev: network interface device structure 1585 * @new_mtu: new value for maximum frame size 1586 * 1587 * Returns 0 on success, negative on failure 1588 **/ 1589 1590static int 1591ixgb_change_mtu(struct net_device *netdev, int new_mtu) 1592{ 1593 struct ixgb_adapter *adapter = netdev_priv(netdev); 1594 int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH; 1595 int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH; 1596 1597 /* MTU < 68 is an error for IPv4 traffic, just don't allow it */ 1598 if ((new_mtu < 68) || 1599 (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) { 1600 netif_err(adapter, probe, adapter->netdev, 1601 "Invalid MTU setting %d\n", new_mtu); 1602 return -EINVAL; 1603 } 1604 1605 if (old_max_frame == max_frame) 1606 return 0; 1607 1608 if (netif_running(netdev)) 1609 ixgb_down(adapter, true); 1610 1611 adapter->rx_buffer_len = max_frame + 8; /* + 8 for errata */ 1612 1613 netdev->mtu = new_mtu; 1614 1615 if (netif_running(netdev)) 1616 ixgb_up(adapter); 1617 1618 return 0; 1619} 1620 1621/** 1622 * ixgb_update_stats - Update the board statistics counters. 1623 * @adapter: board private structure 1624 **/ 1625 1626void 1627ixgb_update_stats(struct ixgb_adapter *adapter) 1628{ 1629 struct net_device *netdev = adapter->netdev; 1630 struct pci_dev *pdev = adapter->pdev; 1631 1632 /* Prevent stats update while adapter is being reset */ 1633 if (pci_channel_offline(pdev)) 1634 return; 1635 1636 if ((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) || 1637 (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) { 1638 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL); 1639 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL); 1640 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH); 1641 u64 bcast = ((u64)bcast_h << 32) | bcast_l; 1642 1643 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32); 1644 /* fix up multicast stats by removing broadcasts */ 1645 if (multi >= bcast) 1646 multi -= bcast; 1647 1648 adapter->stats.mprcl += (multi & 0xFFFFFFFF); 1649 adapter->stats.mprch += (multi >> 32); 1650 adapter->stats.bprcl += bcast_l; 1651 adapter->stats.bprch += bcast_h; 1652 } else { 1653 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL); 1654 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH); 1655 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL); 1656 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH); 1657 } 1658 adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL); 1659 adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH); 1660 adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL); 1661 adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH); 1662 adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL); 1663 adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH); 1664 adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL); 1665 adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH); 1666 adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL); 1667 adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH); 1668 adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL); 1669 adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH); 1670 adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL); 1671 adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH); 1672 adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC); 1673 adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC); 1674 adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC); 1675 adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC); 1676 adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS); 1677 adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC); 1678 adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC); 1679 adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC); 1680 adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL); 1681 adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH); 1682 adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL); 1683 adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH); 1684 adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL); 1685 adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH); 1686 adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL); 1687 adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH); 1688 adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL); 1689 adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH); 1690 adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL); 1691 adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH); 1692 adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL); 1693 adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH); 1694 adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL); 1695 adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH); 1696 adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL); 1697 adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH); 1698 adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC); 1699 adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C); 1700 adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC); 1701 adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC); 1702 adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC); 1703 adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC); 1704 adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC); 1705 adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC); 1706 adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC); 1707 adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC); 1708 adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC); 1709 adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC); 1710 adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC); 1711 adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC); 1712 adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC); 1713 adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC); 1714 1715 /* Fill out the OS statistics structure */ 1716 1717 netdev->stats.rx_packets = adapter->stats.gprcl; 1718 netdev->stats.tx_packets = adapter->stats.gptcl; 1719 netdev->stats.rx_bytes = adapter->stats.gorcl; 1720 netdev->stats.tx_bytes = adapter->stats.gotcl; 1721 netdev->stats.multicast = adapter->stats.mprcl; 1722 netdev->stats.collisions = 0; 1723 1724 /* ignore RLEC as it reports errors for padded (<64bytes) frames 1725 * with a length in the type/len field */ 1726 netdev->stats.rx_errors = 1727 /* adapter->stats.rnbc + */ adapter->stats.crcerrs + 1728 adapter->stats.ruc + 1729 adapter->stats.roc /*+ adapter->stats.rlec */ + 1730 adapter->stats.icbc + 1731 adapter->stats.ecbc + adapter->stats.mpc; 1732 1733 /* see above 1734 * netdev->stats.rx_length_errors = adapter->stats.rlec; 1735 */ 1736 1737 netdev->stats.rx_crc_errors = adapter->stats.crcerrs; 1738 netdev->stats.rx_fifo_errors = adapter->stats.mpc; 1739 netdev->stats.rx_missed_errors = adapter->stats.mpc; 1740 netdev->stats.rx_over_errors = adapter->stats.mpc; 1741 1742 netdev->stats.tx_errors = 0; 1743 netdev->stats.rx_frame_errors = 0; 1744 netdev->stats.tx_aborted_errors = 0; 1745 netdev->stats.tx_carrier_errors = 0; 1746 netdev->stats.tx_fifo_errors = 0; 1747 netdev->stats.tx_heartbeat_errors = 0; 1748 netdev->stats.tx_window_errors = 0; 1749} 1750 1751#define IXGB_MAX_INTR 10 1752/** 1753 * ixgb_intr - Interrupt Handler 1754 * @irq: interrupt number 1755 * @data: pointer to a network interface device structure 1756 **/ 1757 1758static irqreturn_t 1759ixgb_intr(int irq, void *data) 1760{ 1761 struct net_device *netdev = data; 1762 struct ixgb_adapter *adapter = netdev_priv(netdev); 1763 struct ixgb_hw *hw = &adapter->hw; 1764 u32 icr = IXGB_READ_REG(hw, ICR); 1765 1766 if (unlikely(!icr)) 1767 return IRQ_NONE; /* Not our interrupt */ 1768 1769 if (unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC))) 1770 if (!test_bit(__IXGB_DOWN, &adapter->flags)) 1771 mod_timer(&adapter->watchdog_timer, jiffies); 1772 1773 if (napi_schedule_prep(&adapter->napi)) { 1774 1775 /* Disable interrupts and register for poll. The flush 1776 of the posted write is intentionally left out. 1777 */ 1778 1779 IXGB_WRITE_REG(&adapter->hw, IMC, ~0); 1780 __napi_schedule(&adapter->napi); 1781 } 1782 return IRQ_HANDLED; 1783} 1784 1785/** 1786 * ixgb_clean - NAPI Rx polling callback 1787 * @adapter: board private structure 1788 **/ 1789 1790static int 1791ixgb_clean(struct napi_struct *napi, int budget) 1792{ 1793 struct ixgb_adapter *adapter = container_of(napi, struct ixgb_adapter, napi); 1794 int work_done = 0; 1795 1796 ixgb_clean_tx_irq(adapter); 1797 ixgb_clean_rx_irq(adapter, &work_done, budget); 1798 1799 /* If budget not fully consumed, exit the polling mode */ 1800 if (work_done < budget) { 1801 napi_complete(napi); 1802 if (!test_bit(__IXGB_DOWN, &adapter->flags)) 1803 ixgb_irq_enable(adapter); 1804 } 1805 1806 return work_done; 1807} 1808 1809/** 1810 * ixgb_clean_tx_irq - Reclaim resources after transmit completes 1811 * @adapter: board private structure 1812 **/ 1813 1814static bool 1815ixgb_clean_tx_irq(struct ixgb_adapter *adapter) 1816{ 1817 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring; 1818 struct net_device *netdev = adapter->netdev; 1819 struct ixgb_tx_desc *tx_desc, *eop_desc; 1820 struct ixgb_buffer *buffer_info; 1821 unsigned int i, eop; 1822 bool cleaned = false; 1823 1824 i = tx_ring->next_to_clean; 1825 eop = tx_ring->buffer_info[i].next_to_watch; 1826 eop_desc = IXGB_TX_DESC(*tx_ring, eop); 1827 1828 while (eop_desc->status & IXGB_TX_DESC_STATUS_DD) { 1829 1830 rmb(); /* read buffer_info after eop_desc */ 1831 for (cleaned = false; !cleaned; ) { 1832 tx_desc = IXGB_TX_DESC(*tx_ring, i); 1833 buffer_info = &tx_ring->buffer_info[i]; 1834 1835 if (tx_desc->popts & 1836 (IXGB_TX_DESC_POPTS_TXSM | 1837 IXGB_TX_DESC_POPTS_IXSM)) 1838 adapter->hw_csum_tx_good++; 1839 1840 ixgb_unmap_and_free_tx_resource(adapter, buffer_info); 1841 1842 *(u32 *)&(tx_desc->status) = 0; 1843 1844 cleaned = (i == eop); 1845 if (++i == tx_ring->count) i = 0; 1846 } 1847 1848 eop = tx_ring->buffer_info[i].next_to_watch; 1849 eop_desc = IXGB_TX_DESC(*tx_ring, eop); 1850 } 1851 1852 tx_ring->next_to_clean = i; 1853 1854 if (unlikely(cleaned && netif_carrier_ok(netdev) && 1855 IXGB_DESC_UNUSED(tx_ring) >= DESC_NEEDED)) { 1856 /* Make sure that anybody stopping the queue after this 1857 * sees the new next_to_clean. */ 1858 smp_mb(); 1859 1860 if (netif_queue_stopped(netdev) && 1861 !(test_bit(__IXGB_DOWN, &adapter->flags))) { 1862 netif_wake_queue(netdev); 1863 ++adapter->restart_queue; 1864 } 1865 } 1866 1867 if (adapter->detect_tx_hung) { 1868 /* detect a transmit hang in hardware, this serializes the 1869 * check with the clearing of time_stamp and movement of i */ 1870 adapter->detect_tx_hung = false; 1871 if (tx_ring->buffer_info[eop].time_stamp && 1872 time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ) 1873 && !(IXGB_READ_REG(&adapter->hw, STATUS) & 1874 IXGB_STATUS_TXOFF)) { 1875 /* detected Tx unit hang */ 1876 netif_err(adapter, drv, adapter->netdev, 1877 "Detected Tx Unit Hang\n" 1878 " TDH <%x>\n" 1879 " TDT <%x>\n" 1880 " next_to_use <%x>\n" 1881 " next_to_clean <%x>\n" 1882 "buffer_info[next_to_clean]\n" 1883 " time_stamp <%lx>\n" 1884 " next_to_watch <%x>\n" 1885 " jiffies <%lx>\n" 1886 " next_to_watch.status <%x>\n", 1887 IXGB_READ_REG(&adapter->hw, TDH), 1888 IXGB_READ_REG(&adapter->hw, TDT), 1889 tx_ring->next_to_use, 1890 tx_ring->next_to_clean, 1891 tx_ring->buffer_info[eop].time_stamp, 1892 eop, 1893 jiffies, 1894 eop_desc->status); 1895 netif_stop_queue(netdev); 1896 } 1897 } 1898 1899 return cleaned; 1900} 1901 1902/** 1903 * ixgb_rx_checksum - Receive Checksum Offload for 82597. 1904 * @adapter: board private structure 1905 * @rx_desc: receive descriptor 1906 * @sk_buff: socket buffer with received data 1907 **/ 1908 1909static void 1910ixgb_rx_checksum(struct ixgb_adapter *adapter, 1911 struct ixgb_rx_desc *rx_desc, 1912 struct sk_buff *skb) 1913{ 1914 /* Ignore Checksum bit is set OR 1915 * TCP Checksum has not been calculated 1916 */ 1917 if ((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) || 1918 (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) { 1919 skb_checksum_none_assert(skb); 1920 return; 1921 } 1922 1923 /* At this point we know the hardware did the TCP checksum */ 1924 /* now look at the TCP checksum error bit */ 1925 if (rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) { 1926 /* let the stack verify checksum errors */ 1927 skb_checksum_none_assert(skb); 1928 adapter->hw_csum_rx_error++; 1929 } else { 1930 /* TCP checksum is good */ 1931 skb->ip_summed = CHECKSUM_UNNECESSARY; 1932 adapter->hw_csum_rx_good++; 1933 } 1934} 1935 1936/* 1937 * this should improve performance for small packets with large amounts 1938 * of reassembly being done in the stack 1939 */ 1940static void ixgb_check_copybreak(struct net_device *netdev, 1941 struct ixgb_buffer *buffer_info, 1942 u32 length, struct sk_buff **skb) 1943{ 1944 struct sk_buff *new_skb; 1945 1946 if (length > copybreak) 1947 return; 1948 1949 new_skb = netdev_alloc_skb_ip_align(netdev, length); 1950 if (!new_skb) 1951 return; 1952 1953 skb_copy_to_linear_data_offset(new_skb, -NET_IP_ALIGN, 1954 (*skb)->data - NET_IP_ALIGN, 1955 length + NET_IP_ALIGN); 1956 /* save the skb in buffer_info as good */ 1957 buffer_info->skb = *skb; 1958 *skb = new_skb; 1959} 1960 1961/** 1962 * ixgb_clean_rx_irq - Send received data up the network stack, 1963 * @adapter: board private structure 1964 **/ 1965 1966static bool 1967ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do) 1968{ 1969 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring; 1970 struct net_device *netdev = adapter->netdev; 1971 struct pci_dev *pdev = adapter->pdev; 1972 struct ixgb_rx_desc *rx_desc, *next_rxd; 1973 struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer; 1974 u32 length; 1975 unsigned int i, j; 1976 int cleaned_count = 0; 1977 bool cleaned = false; 1978 1979 i = rx_ring->next_to_clean; 1980 rx_desc = IXGB_RX_DESC(*rx_ring, i); 1981 buffer_info = &rx_ring->buffer_info[i]; 1982 1983 while (rx_desc->status & IXGB_RX_DESC_STATUS_DD) { 1984 struct sk_buff *skb; 1985 u8 status; 1986 1987 if (*work_done >= work_to_do) 1988 break; 1989 1990 (*work_done)++; 1991 rmb(); /* read descriptor and rx_buffer_info after status DD */ 1992 status = rx_desc->status; 1993 skb = buffer_info->skb; 1994 buffer_info->skb = NULL; 1995 1996 prefetch(skb->data - NET_IP_ALIGN); 1997 1998 if (++i == rx_ring->count) 1999 i = 0; 2000 next_rxd = IXGB_RX_DESC(*rx_ring, i); 2001 prefetch(next_rxd); 2002 2003 j = i + 1; 2004 if (j == rx_ring->count) 2005 j = 0; 2006 next2_buffer = &rx_ring->buffer_info[j]; 2007 prefetch(next2_buffer); 2008 2009 next_buffer = &rx_ring->buffer_info[i]; 2010 2011 cleaned = true; 2012 cleaned_count++; 2013 2014 dma_unmap_single(&pdev->dev, 2015 buffer_info->dma, 2016 buffer_info->length, 2017 DMA_FROM_DEVICE); 2018 buffer_info->dma = 0; 2019 2020 length = le16_to_cpu(rx_desc->length); 2021 rx_desc->length = 0; 2022 2023 if (unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) { 2024 2025 /* All receives must fit into a single buffer */ 2026 2027 IXGB_DBG("Receive packet consumed multiple buffers " 2028 "length<%x>\n", length); 2029 2030 dev_kfree_skb_irq(skb); 2031 goto rxdesc_done; 2032 } 2033 2034 if (unlikely(rx_desc->errors & 2035 (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE | 2036 IXGB_RX_DESC_ERRORS_P | IXGB_RX_DESC_ERRORS_RXE))) { 2037 dev_kfree_skb_irq(skb); 2038 goto rxdesc_done; 2039 } 2040 2041 ixgb_check_copybreak(netdev, buffer_info, length, &skb); 2042 2043 /* Good Receive */ 2044 skb_put(skb, length); 2045 2046 /* Receive Checksum Offload */ 2047 ixgb_rx_checksum(adapter, rx_desc, skb); 2048 2049 skb->protocol = eth_type_trans(skb, netdev); 2050 if (status & IXGB_RX_DESC_STATUS_VP) 2051 __vlan_hwaccel_put_tag(skb, 2052 le16_to_cpu(rx_desc->special)); 2053 2054 netif_receive_skb(skb); 2055 2056rxdesc_done: 2057 /* clean up descriptor, might be written over by hw */ 2058 rx_desc->status = 0; 2059 2060 /* return some buffers to hardware, one at a time is too slow */ 2061 if (unlikely(cleaned_count >= IXGB_RX_BUFFER_WRITE)) { 2062 ixgb_alloc_rx_buffers(adapter, cleaned_count); 2063 cleaned_count = 0; 2064 } 2065 2066 /* use prefetched values */ 2067 rx_desc = next_rxd; 2068 buffer_info = next_buffer; 2069 } 2070 2071 rx_ring->next_to_clean = i; 2072 2073 cleaned_count = IXGB_DESC_UNUSED(rx_ring); 2074 if (cleaned_count) 2075 ixgb_alloc_rx_buffers(adapter, cleaned_count); 2076 2077 return cleaned; 2078} 2079 2080/** 2081 * ixgb_alloc_rx_buffers - Replace used receive buffers 2082 * @adapter: address of board private structure 2083 **/ 2084 2085static void 2086ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter, int cleaned_count) 2087{ 2088 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring; 2089 struct net_device *netdev = adapter->netdev; 2090 struct pci_dev *pdev = adapter->pdev; 2091 struct ixgb_rx_desc *rx_desc; 2092 struct ixgb_buffer *buffer_info; 2093 struct sk_buff *skb; 2094 unsigned int i; 2095 long cleancount; 2096 2097 i = rx_ring->next_to_use; 2098 buffer_info = &rx_ring->buffer_info[i]; 2099 cleancount = IXGB_DESC_UNUSED(rx_ring); 2100 2101 2102 /* leave three descriptors unused */ 2103 while (--cleancount > 2 && cleaned_count--) { 2104 /* recycle! its good for you */ 2105 skb = buffer_info->skb; 2106 if (skb) { 2107 skb_trim(skb, 0); 2108 goto map_skb; 2109 } 2110 2111 skb = netdev_alloc_skb_ip_align(netdev, adapter->rx_buffer_len); 2112 if (unlikely(!skb)) { 2113 /* Better luck next round */ 2114 adapter->alloc_rx_buff_failed++; 2115 break; 2116 } 2117 2118 buffer_info->skb = skb; 2119 buffer_info->length = adapter->rx_buffer_len; 2120map_skb: 2121 buffer_info->dma = dma_map_single(&pdev->dev, 2122 skb->data, 2123 adapter->rx_buffer_len, 2124 DMA_FROM_DEVICE); 2125 2126 rx_desc = IXGB_RX_DESC(*rx_ring, i); 2127 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma); 2128 /* guarantee DD bit not set now before h/w gets descriptor 2129 * this is the rest of the workaround for h/w double 2130 * writeback. */ 2131 rx_desc->status = 0; 2132 2133 2134 if (++i == rx_ring->count) i = 0; 2135 buffer_info = &rx_ring->buffer_info[i]; 2136 } 2137 2138 if (likely(rx_ring->next_to_use != i)) { 2139 rx_ring->next_to_use = i; 2140 if (unlikely(i-- == 0)) 2141 i = (rx_ring->count - 1); 2142 2143 /* Force memory writes to complete before letting h/w 2144 * know there are new descriptors to fetch. (Only 2145 * applicable for weak-ordered memory model archs, such 2146 * as IA-64). */ 2147 wmb(); 2148 IXGB_WRITE_REG(&adapter->hw, RDT, i); 2149 } 2150} 2151 2152static void 2153ixgb_vlan_strip_enable(struct ixgb_adapter *adapter) 2154{ 2155 u32 ctrl; 2156 2157 /* enable VLAN tag insert/strip */ 2158 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0); 2159 ctrl |= IXGB_CTRL0_VME; 2160 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl); 2161} 2162 2163static void 2164ixgb_vlan_strip_disable(struct ixgb_adapter *adapter) 2165{ 2166 u32 ctrl; 2167 2168 /* disable VLAN tag insert/strip */ 2169 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0); 2170 ctrl &= ~IXGB_CTRL0_VME; 2171 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl); 2172} 2173 2174static void 2175ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid) 2176{ 2177 struct ixgb_adapter *adapter = netdev_priv(netdev); 2178 u32 vfta, index; 2179 2180 /* add VID to filter table */ 2181 2182 index = (vid >> 5) & 0x7F; 2183 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index); 2184 vfta |= (1 << (vid & 0x1F)); 2185 ixgb_write_vfta(&adapter->hw, index, vfta); 2186 set_bit(vid, adapter->active_vlans); 2187} 2188 2189static void 2190ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid) 2191{ 2192 struct ixgb_adapter *adapter = netdev_priv(netdev); 2193 u32 vfta, index; 2194 2195 /* remove VID from filter table */ 2196 2197 index = (vid >> 5) & 0x7F; 2198 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index); 2199 vfta &= ~(1 << (vid & 0x1F)); 2200 ixgb_write_vfta(&adapter->hw, index, vfta); 2201 clear_bit(vid, adapter->active_vlans); 2202} 2203 2204static void 2205ixgb_restore_vlan(struct ixgb_adapter *adapter) 2206{ 2207 u16 vid; 2208 2209 for_each_set_bit(vid, adapter->active_vlans, VLAN_N_VID) 2210 ixgb_vlan_rx_add_vid(adapter->netdev, vid); 2211} 2212 2213#ifdef CONFIG_NET_POLL_CONTROLLER 2214/* 2215 * Polling 'interrupt' - used by things like netconsole to send skbs 2216 * without having to re-enable interrupts. It's not called while 2217 * the interrupt routine is executing. 2218 */ 2219 2220static void ixgb_netpoll(struct net_device *dev) 2221{ 2222 struct ixgb_adapter *adapter = netdev_priv(dev); 2223 2224 disable_irq(adapter->pdev->irq); 2225 ixgb_intr(adapter->pdev->irq, dev); 2226 enable_irq(adapter->pdev->irq); 2227} 2228#endif 2229 2230/** 2231 * ixgb_io_error_detected() - called when PCI error is detected 2232 * @pdev pointer to pci device with error 2233 * @state pci channel state after error 2234 * 2235 * This callback is called by the PCI subsystem whenever 2236 * a PCI bus error is detected. 2237 */ 2238static pci_ers_result_t ixgb_io_error_detected(struct pci_dev *pdev, 2239 enum pci_channel_state state) 2240{ 2241 struct net_device *netdev = pci_get_drvdata(pdev); 2242 struct ixgb_adapter *adapter = netdev_priv(netdev); 2243 2244 netif_device_detach(netdev); 2245 2246 if (state == pci_channel_io_perm_failure) 2247 return PCI_ERS_RESULT_DISCONNECT; 2248 2249 if (netif_running(netdev)) 2250 ixgb_down(adapter, true); 2251 2252 pci_disable_device(pdev); 2253 2254 /* Request a slot reset. */ 2255 return PCI_ERS_RESULT_NEED_RESET; 2256} 2257 2258/** 2259 * ixgb_io_slot_reset - called after the pci bus has been reset. 2260 * @pdev pointer to pci device with error 2261 * 2262 * This callback is called after the PCI bus has been reset. 2263 * Basically, this tries to restart the card from scratch. 2264 * This is a shortened version of the device probe/discovery code, 2265 * it resembles the first-half of the ixgb_probe() routine. 2266 */ 2267static pci_ers_result_t ixgb_io_slot_reset(struct pci_dev *pdev) 2268{ 2269 struct net_device *netdev = pci_get_drvdata(pdev); 2270 struct ixgb_adapter *adapter = netdev_priv(netdev); 2271 2272 if (pci_enable_device(pdev)) { 2273 netif_err(adapter, probe, adapter->netdev, 2274 "Cannot re-enable PCI device after reset\n"); 2275 return PCI_ERS_RESULT_DISCONNECT; 2276 } 2277 2278 /* Perform card reset only on one instance of the card */ 2279 if (0 != PCI_FUNC (pdev->devfn)) 2280 return PCI_ERS_RESULT_RECOVERED; 2281 2282 pci_set_master(pdev); 2283 2284 netif_carrier_off(netdev); 2285 netif_stop_queue(netdev); 2286 ixgb_reset(adapter); 2287 2288 /* Make sure the EEPROM is good */ 2289 if (!ixgb_validate_eeprom_checksum(&adapter->hw)) { 2290 netif_err(adapter, probe, adapter->netdev, 2291 "After reset, the EEPROM checksum is not valid\n"); 2292 return PCI_ERS_RESULT_DISCONNECT; 2293 } 2294 ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr); 2295 memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len); 2296 2297 if (!is_valid_ether_addr(netdev->perm_addr)) { 2298 netif_err(adapter, probe, adapter->netdev, 2299 "After reset, invalid MAC address\n"); 2300 return PCI_ERS_RESULT_DISCONNECT; 2301 } 2302 2303 return PCI_ERS_RESULT_RECOVERED; 2304} 2305 2306/** 2307 * ixgb_io_resume - called when its OK to resume normal operations 2308 * @pdev pointer to pci device with error 2309 * 2310 * The error recovery driver tells us that its OK to resume 2311 * normal operation. Implementation resembles the second-half 2312 * of the ixgb_probe() routine. 2313 */ 2314static void ixgb_io_resume(struct pci_dev *pdev) 2315{ 2316 struct net_device *netdev = pci_get_drvdata(pdev); 2317 struct ixgb_adapter *adapter = netdev_priv(netdev); 2318 2319 pci_set_master(pdev); 2320 2321 if (netif_running(netdev)) { 2322 if (ixgb_up(adapter)) { 2323 pr_err("can't bring device back up after reset\n"); 2324 return; 2325 } 2326 } 2327 2328 netif_device_attach(netdev); 2329 mod_timer(&adapter->watchdog_timer, jiffies); 2330} 2331 2332/* ixgb_main.c */ 2333