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staging/hv/osd: don't reimplement ALIGN macro
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / net / ixgb / ixgb_main.c
blob5639cccb49351a4e6466fc8d692eb86c81fcc386
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 "ixgb.h"
32
33 char ixgb_driver_name[] = "ixgb";
34 static char ixgb_driver_string[] = "Intel(R) PRO/10GbE Network Driver";
35
36 #define DRIVERNAPI "-NAPI"
37 #define DRV_VERSION "1.0.135-k2" DRIVERNAPI
38 const char ixgb_driver_version[] = DRV_VERSION;
39 static const char ixgb_copyright[] = "Copyright (c) 1999-2008 Intel Corporation.";
40
41 #define IXGB_CB_LENGTH 256
42 static unsigned int copybreak __read_mostly = IXGB_CB_LENGTH;
43 module_param(copybreak, uint, 0644);
44 MODULE_PARM_DESC(copybreak,
45 "Maximum size of packet that is copied to a new buffer on receive");
46
47 /* ixgb_pci_tbl - PCI Device ID Table
48 *
49 * Wildcard entries (PCI_ANY_ID) should come last
50 * Last entry must be all 0s
51 *
52 * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
53 * Class, Class Mask, private data (not used) }
54 */
55 static DEFINE_PCI_DEVICE_TABLE(ixgb_pci_tbl) = {
56 {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX,
57 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
58 {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_CX4,
59 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
60 {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_SR,
61 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
62 {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_LR,
63 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
64
65 /* required last entry */
66 {0,}
67 };
68
69 MODULE_DEVICE_TABLE(pci, ixgb_pci_tbl);
70
71 /* Local Function Prototypes */
72 static int ixgb_init_module(void);
73 static void ixgb_exit_module(void);
74 static int ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
75 static void __devexit ixgb_remove(struct pci_dev *pdev);
76 static int ixgb_sw_init(struct ixgb_adapter *adapter);
77 static int ixgb_open(struct net_device *netdev);
78 static int ixgb_close(struct net_device *netdev);
79 static void ixgb_configure_tx(struct ixgb_adapter *adapter);
80 static void ixgb_configure_rx(struct ixgb_adapter *adapter);
81 static void ixgb_setup_rctl(struct ixgb_adapter *adapter);
82 static void ixgb_clean_tx_ring(struct ixgb_adapter *adapter);
83 static void ixgb_clean_rx_ring(struct ixgb_adapter *adapter);
84 static void ixgb_set_multi(struct net_device *netdev);
85 static void ixgb_watchdog(unsigned long data);
86 static netdev_tx_t ixgb_xmit_frame(struct sk_buff *skb,
87 struct net_device *netdev);
88 static struct net_device_stats *ixgb_get_stats(struct net_device *netdev);
89 static int ixgb_change_mtu(struct net_device *netdev, int new_mtu);
90 static int ixgb_set_mac(struct net_device *netdev, void *p);
91 static irqreturn_t ixgb_intr(int irq, void *data);
92 static bool ixgb_clean_tx_irq(struct ixgb_adapter *adapter);
93
94 static int ixgb_clean(struct napi_struct *, int);
95 static bool ixgb_clean_rx_irq(struct ixgb_adapter *, int *, int);
96 static void ixgb_alloc_rx_buffers(struct ixgb_adapter *, int);
97
98 static void ixgb_tx_timeout(struct net_device *dev);
99 static void ixgb_tx_timeout_task(struct work_struct *work);
100
101 static void ixgb_vlan_strip_enable(struct ixgb_adapter *adapter);
102 static void ixgb_vlan_strip_disable(struct ixgb_adapter *adapter);
103 static void ixgb_vlan_rx_register(struct net_device *netdev,
104 struct vlan_group *grp);
105 static void ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid);
106 static void ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid);
107 static void ixgb_restore_vlan(struct ixgb_adapter *adapter);
108
109 #ifdef CONFIG_NET_POLL_CONTROLLER
110 /* for netdump / net console */
111 static void ixgb_netpoll(struct net_device *dev);
112 #endif
113
114 static pci_ers_result_t ixgb_io_error_detected (struct pci_dev *pdev,
115 enum pci_channel_state state);
116 static pci_ers_result_t ixgb_io_slot_reset (struct pci_dev *pdev);
117 static void ixgb_io_resume (struct pci_dev *pdev);
118
119 static struct pci_error_handlers ixgb_err_handler = {
120 .error_detected = ixgb_io_error_detected,
121 .slot_reset = ixgb_io_slot_reset,
122 .resume = ixgb_io_resume,
123 };
124
125 static struct pci_driver ixgb_driver = {
126 .name = ixgb_driver_name,
127 .id_table = ixgb_pci_tbl,
128 .probe = ixgb_probe,
129 .remove = __devexit_p(ixgb_remove),
130 .err_handler = &ixgb_err_handler
131 };
132
133 MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
134 MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver");
135 MODULE_LICENSE("GPL");
136 MODULE_VERSION(DRV_VERSION);
137
138 #define DEFAULT_DEBUG_LEVEL_SHIFT 3
139 static int debug = DEFAULT_DEBUG_LEVEL_SHIFT;
140 module_param(debug, int, 0);
141 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
142
143 /**
144 * ixgb_init_module - Driver Registration Routine
145 *
146 * ixgb_init_module is the first routine called when the driver is
147 * loaded. All it does is register with the PCI subsystem.
148 **/
149
150 static int __init
151 ixgb_init_module(void)
152 {
153 pr_info("%s - version %s\n", ixgb_driver_string, ixgb_driver_version);
154 pr_info("%s\n", ixgb_copyright);
155
156 return pci_register_driver(&ixgb_driver);
157 }
158
159 module_init(ixgb_init_module);
160
161 /**
162 * ixgb_exit_module - Driver Exit Cleanup Routine
163 *
164 * ixgb_exit_module is called just before the driver is removed
165 * from memory.
166 **/
167
168 static void __exit
169 ixgb_exit_module(void)
170 {
171 pci_unregister_driver(&ixgb_driver);
172 }
173
174 module_exit(ixgb_exit_module);
175
176 /**
177 * ixgb_irq_disable - Mask off interrupt generation on the NIC
178 * @adapter: board private structure
179 **/
180
181 static void
182 ixgb_irq_disable(struct ixgb_adapter *adapter)
183 {
184 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
185 IXGB_WRITE_FLUSH(&adapter->hw);
186 synchronize_irq(adapter->pdev->irq);
187 }
188
189 /**
190 * ixgb_irq_enable - Enable default interrupt generation settings
191 * @adapter: board private structure
192 **/
193
194 static void
195 ixgb_irq_enable(struct ixgb_adapter *adapter)
196 {
197 u32 val = IXGB_INT_RXT0 | IXGB_INT_RXDMT0 |
198 IXGB_INT_TXDW | IXGB_INT_LSC;
199 if (adapter->hw.subsystem_vendor_id == SUN_SUBVENDOR_ID)
200 val |= IXGB_INT_GPI0;
201 IXGB_WRITE_REG(&adapter->hw, IMS, val);
202 IXGB_WRITE_FLUSH(&adapter->hw);
203 }
204
205 int
206 ixgb_up(struct ixgb_adapter *adapter)
207 {
208 struct net_device *netdev = adapter->netdev;
209 int err, irq_flags = IRQF_SHARED;
210 int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
211 struct ixgb_hw *hw = &adapter->hw;
212
213 /* hardware has been reset, we need to reload some things */
214
215 ixgb_rar_set(hw, netdev->dev_addr, 0);
216 ixgb_set_multi(netdev);
217
218 ixgb_restore_vlan(adapter);
219
220 ixgb_configure_tx(adapter);
221 ixgb_setup_rctl(adapter);
222 ixgb_configure_rx(adapter);
223 ixgb_alloc_rx_buffers(adapter, IXGB_DESC_UNUSED(&adapter->rx_ring));
224
225 /* disable interrupts and get the hardware into a known state */
226 IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);
227
228 /* only enable MSI if bus is in PCI-X mode */
229 if (IXGB_READ_REG(&adapter->hw, STATUS) & IXGB_STATUS_PCIX_MODE) {
230 err = pci_enable_msi(adapter->pdev);
231 if (!err) {
232 adapter->have_msi = 1;
233 irq_flags = 0;
234 }
235 /* proceed to try to request regular interrupt */
236 }
237
238 err = request_irq(adapter->pdev->irq, ixgb_intr, irq_flags,
239 netdev->name, netdev);
240 if (err) {
241 if (adapter->have_msi)
242 pci_disable_msi(adapter->pdev);
243 netif_err(adapter, probe, adapter->netdev,
244 "Unable to allocate interrupt Error: %d\n", err);
245 return err;
246 }
247
248 if ((hw->max_frame_size != max_frame) ||
249 (hw->max_frame_size !=
250 (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {
251
252 hw->max_frame_size = max_frame;
253
254 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
255
256 if (hw->max_frame_size >
257 IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
258 u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
259
260 if (!(ctrl0 & IXGB_CTRL0_JFE)) {
261 ctrl0 |= IXGB_CTRL0_JFE;
262 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
263 }
264 }
265 }
266
267 clear_bit(__IXGB_DOWN, &adapter->flags);
268
269 napi_enable(&adapter->napi);
270 ixgb_irq_enable(adapter);
271
272 netif_wake_queue(netdev);
273
274 mod_timer(&adapter->watchdog_timer, jiffies);
275
276 return 0;
277 }
278
279 void
280 ixgb_down(struct ixgb_adapter *adapter, bool kill_watchdog)
281 {
282 struct net_device *netdev = adapter->netdev;
283
284 /* prevent the interrupt handler from restarting watchdog */
285 set_bit(__IXGB_DOWN, &adapter->flags);
286
287 napi_disable(&adapter->napi);
288 /* waiting for NAPI to complete can re-enable interrupts */
289 ixgb_irq_disable(adapter);
290 free_irq(adapter->pdev->irq, netdev);
291
292 if (adapter->have_msi)
293 pci_disable_msi(adapter->pdev);
294
295 if (kill_watchdog)
296 del_timer_sync(&adapter->watchdog_timer);
297
298 adapter->link_speed = 0;
299 adapter->link_duplex = 0;
300 netif_carrier_off(netdev);
301 netif_stop_queue(netdev);
302
303 ixgb_reset(adapter);
304 ixgb_clean_tx_ring(adapter);
305 ixgb_clean_rx_ring(adapter);
306 }
307
308 void
309 ixgb_reset(struct ixgb_adapter *adapter)
310 {
311 struct ixgb_hw *hw = &adapter->hw;
312
313 ixgb_adapter_stop(hw);
314 if (!ixgb_init_hw(hw))
315 netif_err(adapter, probe, adapter->netdev, "ixgb_init_hw failed\n");
316
317 /* restore frame size information */
318 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
319 if (hw->max_frame_size >
320 IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
321 u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
322 if (!(ctrl0 & IXGB_CTRL0_JFE)) {
323 ctrl0 |= IXGB_CTRL0_JFE;
324 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
325 }
326 }
327 }
328
329 static const struct net_device_ops ixgb_netdev_ops = {
330 .ndo_open = ixgb_open,
331 .ndo_stop = ixgb_close,
332 .ndo_start_xmit = ixgb_xmit_frame,
333 .ndo_get_stats = ixgb_get_stats,
334 .ndo_set_multicast_list = ixgb_set_multi,
335 .ndo_validate_addr = eth_validate_addr,
336 .ndo_set_mac_address = ixgb_set_mac,
337 .ndo_change_mtu = ixgb_change_mtu,
338 .ndo_tx_timeout = ixgb_tx_timeout,
339 .ndo_vlan_rx_register = ixgb_vlan_rx_register,
340 .ndo_vlan_rx_add_vid = ixgb_vlan_rx_add_vid,
341 .ndo_vlan_rx_kill_vid = ixgb_vlan_rx_kill_vid,
342 #ifdef CONFIG_NET_POLL_CONTROLLER
343 .ndo_poll_controller = ixgb_netpoll,
344 #endif
345 };
346
347 /**
348 * ixgb_probe - Device Initialization Routine
349 * @pdev: PCI device information struct
350 * @ent: entry in ixgb_pci_tbl
351 *
352 * Returns 0 on success, negative on failure
353 *
354 * ixgb_probe initializes an adapter identified by a pci_dev structure.
355 * The OS initialization, configuring of the adapter private structure,
356 * and a hardware reset occur.
357 **/
358
359 static int __devinit
360 ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
361 {
362 struct net_device *netdev = NULL;
363 struct ixgb_adapter *adapter;
364 static int cards_found = 0;
365 int pci_using_dac;
366 int i;
367 int err;
368
369 err = pci_enable_device(pdev);
370 if (err)
371 return err;
372
373 pci_using_dac = 0;
374 err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(64));
375 if (!err) {
376 err = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64));
377 if (!err)
378 pci_using_dac = 1;
379 } else {
380 err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
381 if (err) {
382 err = dma_set_coherent_mask(&pdev->dev,
383 DMA_BIT_MASK(32));
384 if (err) {
385 pr_err("No usable DMA configuration, aborting\n");
386 goto err_dma_mask;
387 }
388 }
389 }
390
391 err = pci_request_regions(pdev, ixgb_driver_name);
392 if (err)
393 goto err_request_regions;
394
395 pci_set_master(pdev);
396
397 netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
398 if (!netdev) {
399 err = -ENOMEM;
400 goto err_alloc_etherdev;
401 }
402
403 SET_NETDEV_DEV(netdev, &pdev->dev);
404
405 pci_set_drvdata(pdev, netdev);
406 adapter = netdev_priv(netdev);
407 adapter->netdev = netdev;
408 adapter->pdev = pdev;
409 adapter->hw.back = adapter;
410 adapter->msg_enable = netif_msg_init(debug, DEFAULT_DEBUG_LEVEL_SHIFT);
411
412 adapter->hw.hw_addr = pci_ioremap_bar(pdev, BAR_0);
413 if (!adapter->hw.hw_addr) {
414 err = -EIO;
415 goto err_ioremap;
416 }
417
418 for (i = BAR_1; i <= BAR_5; i++) {
419 if (pci_resource_len(pdev, i) == 0)
420 continue;
421 if (pci_resource_flags(pdev, i) & IORESOURCE_IO) {
422 adapter->hw.io_base = pci_resource_start(pdev, i);
423 break;
424 }
425 }
426
427 netdev->netdev_ops = &ixgb_netdev_ops;
428 ixgb_set_ethtool_ops(netdev);
429 netdev->watchdog_timeo = 5 * HZ;
430 netif_napi_add(netdev, &adapter->napi, ixgb_clean, 64);
431
432 strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
433
434 adapter->bd_number = cards_found;
435 adapter->link_speed = 0;
436 adapter->link_duplex = 0;
437
438 /* setup the private structure */
439
440 err = ixgb_sw_init(adapter);
441 if (err)
442 goto err_sw_init;
443
444 netdev->features = NETIF_F_SG |
445 NETIF_F_HW_CSUM |
446 NETIF_F_HW_VLAN_TX |
447 NETIF_F_HW_VLAN_RX |
448 NETIF_F_HW_VLAN_FILTER;
449 netdev->features |= NETIF_F_TSO;
450
451 if (pci_using_dac) {
452 netdev->features |= NETIF_F_HIGHDMA;
453 netdev->vlan_features |= NETIF_F_HIGHDMA;
454 }
455
456 /* make sure the EEPROM is good */
457
458 if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
459 netif_err(adapter, probe, adapter->netdev,
460 "The EEPROM Checksum Is Not Valid\n");
461 err = -EIO;
462 goto err_eeprom;
463 }
464
465 ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
466 memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
467
468 if (!is_valid_ether_addr(netdev->perm_addr)) {
469 netif_err(adapter, probe, adapter->netdev, "Invalid MAC Address\n");
470 err = -EIO;
471 goto err_eeprom;
472 }
473
474 adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
475
476 init_timer(&adapter->watchdog_timer);
477 adapter->watchdog_timer.function = ixgb_watchdog;
478 adapter->watchdog_timer.data = (unsigned long)adapter;
479
480 INIT_WORK(&adapter->tx_timeout_task, ixgb_tx_timeout_task);
481
482 strcpy(netdev->name, "eth%d");
483 err = register_netdev(netdev);
484 if (err)
485 goto err_register;
486
487 /* carrier off reporting is important to ethtool even BEFORE open */
488 netif_carrier_off(netdev);
489
490 netif_info(adapter, probe, adapter->netdev,
491 "Intel(R) PRO/10GbE Network Connection\n");
492 ixgb_check_options(adapter);
493 /* reset the hardware with the new settings */
494
495 ixgb_reset(adapter);
496
497 cards_found++;
498 return 0;
499
500 err_register:
501 err_sw_init:
502 err_eeprom:
503 iounmap(adapter->hw.hw_addr);
504 err_ioremap:
505 free_netdev(netdev);
506 err_alloc_etherdev:
507 pci_release_regions(pdev);
508 err_request_regions:
509 err_dma_mask:
510 pci_disable_device(pdev);
511 return err;
512 }
513
514 /**
515 * ixgb_remove - Device Removal Routine
516 * @pdev: PCI device information struct
517 *
518 * ixgb_remove is called by the PCI subsystem to alert the driver
519 * that it should release a PCI device. The could be caused by a
520 * Hot-Plug event, or because the driver is going to be removed from
521 * memory.
522 **/
523
524 static void __devexit
525 ixgb_remove(struct pci_dev *pdev)
526 {
527 struct net_device *netdev = pci_get_drvdata(pdev);
528 struct ixgb_adapter *adapter = netdev_priv(netdev);
529
530 cancel_work_sync(&adapter->tx_timeout_task);
531
532 unregister_netdev(netdev);
533
534 iounmap(adapter->hw.hw_addr);
535 pci_release_regions(pdev);
536
537 free_netdev(netdev);
538 pci_disable_device(pdev);
539 }
540
541 /**
542 * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
543 * @adapter: board private structure to initialize
544 *
545 * ixgb_sw_init initializes the Adapter private data structure.
546 * Fields are initialized based on PCI device information and
547 * OS network device settings (MTU size).
548 **/
549
550 static int __devinit
551 ixgb_sw_init(struct ixgb_adapter *adapter)
552 {
553 struct ixgb_hw *hw = &adapter->hw;
554 struct net_device *netdev = adapter->netdev;
555 struct pci_dev *pdev = adapter->pdev;
556
557 /* PCI config space info */
558
559 hw->vendor_id = pdev->vendor;
560 hw->device_id = pdev->device;
561 hw->subsystem_vendor_id = pdev->subsystem_vendor;
562 hw->subsystem_id = pdev->subsystem_device;
563
564 hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
565 adapter->rx_buffer_len = hw->max_frame_size + 8; /* + 8 for errata */
566
567 if ((hw->device_id == IXGB_DEVICE_ID_82597EX) ||
568 (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4) ||
569 (hw->device_id == IXGB_DEVICE_ID_82597EX_LR) ||
570 (hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
571 hw->mac_type = ixgb_82597;
572 else {
573 /* should never have loaded on this device */
574 netif_err(adapter, probe, adapter->netdev, "unsupported device id\n");
575 }
576
577 /* enable flow control to be programmed */
578 hw->fc.send_xon = 1;
579
580 set_bit(__IXGB_DOWN, &adapter->flags);
581 return 0;
582 }
583
584 /**
585 * ixgb_open - Called when a network interface is made active
586 * @netdev: network interface device structure
587 *
588 * Returns 0 on success, negative value on failure
589 *
590 * The open entry point is called when a network interface is made
591 * active by the system (IFF_UP). At this point all resources needed
592 * for transmit and receive operations are allocated, the interrupt
593 * handler is registered with the OS, the watchdog timer is started,
594 * and the stack is notified that the interface is ready.
595 **/
596
597 static int
598 ixgb_open(struct net_device *netdev)
599 {
600 struct ixgb_adapter *adapter = netdev_priv(netdev);
601 int err;
602
603 /* allocate transmit descriptors */
604 err = ixgb_setup_tx_resources(adapter);
605 if (err)
606 goto err_setup_tx;
607
608 netif_carrier_off(netdev);
609
610 /* allocate receive descriptors */
611
612 err = ixgb_setup_rx_resources(adapter);
613 if (err)
614 goto err_setup_rx;
615
616 err = ixgb_up(adapter);
617 if (err)
618 goto err_up;
619
620 netif_start_queue(netdev);
621
622 return 0;
623
624 err_up:
625 ixgb_free_rx_resources(adapter);
626 err_setup_rx:
627 ixgb_free_tx_resources(adapter);
628 err_setup_tx:
629 ixgb_reset(adapter);
630
631 return err;
632 }
633
634 /**
635 * ixgb_close - Disables a network interface
636 * @netdev: network interface device structure
637 *
638 * Returns 0, this is not allowed to fail
639 *
640 * The close entry point is called when an interface is de-activated
641 * by the OS. The hardware is still under the drivers control, but
642 * needs to be disabled. A global MAC reset is issued to stop the
643 * hardware, and all transmit and receive resources are freed.
644 **/
645
646 static int
647 ixgb_close(struct net_device *netdev)
648 {
649 struct ixgb_adapter *adapter = netdev_priv(netdev);
650
651 ixgb_down(adapter, true);
652
653 ixgb_free_tx_resources(adapter);
654 ixgb_free_rx_resources(adapter);
655
656 return 0;
657 }
658
659 /**
660 * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
661 * @adapter: board private structure
662 *
663 * Return 0 on success, negative on failure
664 **/
665
666 int
667 ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
668 {
669 struct ixgb_desc_ring *txdr = &adapter->tx_ring;
670 struct pci_dev *pdev = adapter->pdev;
671 int size;
672
673 size = sizeof(struct ixgb_buffer) * txdr->count;
674 txdr->buffer_info = vzalloc(size);
675 if (!txdr->buffer_info) {
676 netif_err(adapter, probe, adapter->netdev,
677 "Unable to allocate transmit descriptor ring memory\n");
678 return -ENOMEM;
679 }
680
681 /* round up to nearest 4K */
682
683 txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
684 txdr->size = ALIGN(txdr->size, 4096);
685
686 txdr->desc = dma_alloc_coherent(&pdev->dev, txdr->size, &txdr->dma,
687 GFP_KERNEL);
688 if (!txdr->desc) {
689 vfree(txdr->buffer_info);
690 netif_err(adapter, probe, adapter->netdev,
691 "Unable to allocate transmit descriptor memory\n");
692 return -ENOMEM;
693 }
694 memset(txdr->desc, 0, txdr->size);
695
696 txdr->next_to_use = 0;
697 txdr->next_to_clean = 0;
698
699 return 0;
700 }
701
702 /**
703 * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
704 * @adapter: board private structure
705 *
706 * Configure the Tx unit of the MAC after a reset.
707 **/
708
709 static void
710 ixgb_configure_tx(struct ixgb_adapter *adapter)
711 {
712 u64 tdba = adapter->tx_ring.dma;
713 u32 tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
714 u32 tctl;
715 struct ixgb_hw *hw = &adapter->hw;
716
717 /* Setup the Base and Length of the Tx Descriptor Ring
718 * tx_ring.dma can be either a 32 or 64 bit value
719 */
720
721 IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
722 IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
723
724 IXGB_WRITE_REG(hw, TDLEN, tdlen);
725
726 /* Setup the HW Tx Head and Tail descriptor pointers */
727
728 IXGB_WRITE_REG(hw, TDH, 0);
729 IXGB_WRITE_REG(hw, TDT, 0);
730
731 /* don't set up txdctl, it induces performance problems if configured
732 * incorrectly */
733 /* Set the Tx Interrupt Delay register */
734
735 IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
736
737 /* Program the Transmit Control Register */
738
739 tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
740 IXGB_WRITE_REG(hw, TCTL, tctl);
741
742 /* Setup Transmit Descriptor Settings for this adapter */
743 adapter->tx_cmd_type =
744 IXGB_TX_DESC_TYPE |
745 (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
746 }
747
748 /**
749 * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
750 * @adapter: board private structure
751 *
752 * Returns 0 on success, negative on failure
753 **/
754
755 int
756 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
757 {
758 struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
759 struct pci_dev *pdev = adapter->pdev;
760 int size;
761
762 size = sizeof(struct ixgb_buffer) * rxdr->count;
763 rxdr->buffer_info = vzalloc(size);
764 if (!rxdr->buffer_info) {
765 netif_err(adapter, probe, adapter->netdev,
766 "Unable to allocate receive descriptor ring\n");
767 return -ENOMEM;
768 }
769
770 /* Round up to nearest 4K */
771
772 rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
773 rxdr->size = ALIGN(rxdr->size, 4096);
774
775 rxdr->desc = dma_alloc_coherent(&pdev->dev, rxdr->size, &rxdr->dma,
776 GFP_KERNEL);
777
778 if (!rxdr->desc) {
779 vfree(rxdr->buffer_info);
780 netif_err(adapter, probe, adapter->netdev,
781 "Unable to allocate receive descriptors\n");
782 return -ENOMEM;
783 }
784 memset(rxdr->desc, 0, rxdr->size);
785
786 rxdr->next_to_clean = 0;
787 rxdr->next_to_use = 0;
788
789 return 0;
790 }
791
792 /**
793 * ixgb_setup_rctl - configure the receive control register
794 * @adapter: Board private structure
795 **/
796
797 static void
798 ixgb_setup_rctl(struct ixgb_adapter *adapter)
799 {
800 u32 rctl;
801
802 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
803
804 rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
805
806 rctl |=
807 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
808 IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
809 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
810
811 rctl |= IXGB_RCTL_SECRC;
812
813 if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048)
814 rctl |= IXGB_RCTL_BSIZE_2048;
815 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096)
816 rctl |= IXGB_RCTL_BSIZE_4096;
817 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192)
818 rctl |= IXGB_RCTL_BSIZE_8192;
819 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384)
820 rctl |= IXGB_RCTL_BSIZE_16384;
821
822 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
823 }
824
825 /**
826 * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
827 * @adapter: board private structure
828 *
829 * Configure the Rx unit of the MAC after a reset.
830 **/
831
832 static void
833 ixgb_configure_rx(struct ixgb_adapter *adapter)
834 {
835 u64 rdba = adapter->rx_ring.dma;
836 u32 rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
837 struct ixgb_hw *hw = &adapter->hw;
838 u32 rctl;
839 u32 rxcsum;
840
841 /* make sure receives are disabled while setting up the descriptors */
842
843 rctl = IXGB_READ_REG(hw, RCTL);
844 IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
845
846 /* set the Receive Delay Timer Register */
847
848 IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
849
850 /* Setup the Base and Length of the Rx Descriptor Ring */
851
852 IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
853 IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
854
855 IXGB_WRITE_REG(hw, RDLEN, rdlen);
856
857 /* Setup the HW Rx Head and Tail Descriptor Pointers */
858 IXGB_WRITE_REG(hw, RDH, 0);
859 IXGB_WRITE_REG(hw, RDT, 0);
860
861 /* due to the hardware errata with RXDCTL, we are unable to use any of
862 * the performance enhancing features of it without causing other
863 * subtle bugs, some of the bugs could include receive length
864 * corruption at high data rates (WTHRESH > 0) and/or receive
865 * descriptor ring irregularites (particularly in hardware cache) */
866 IXGB_WRITE_REG(hw, RXDCTL, 0);
867
868 /* Enable Receive Checksum Offload for TCP and UDP */
869 if (adapter->rx_csum) {
870 rxcsum = IXGB_READ_REG(hw, RXCSUM);
871 rxcsum |= IXGB_RXCSUM_TUOFL;
872 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
873 }
874
875 /* Enable Receives */
876
877 IXGB_WRITE_REG(hw, RCTL, rctl);
878 }
879
880 /**
881 * ixgb_free_tx_resources - Free Tx Resources
882 * @adapter: board private structure
883 *
884 * Free all transmit software resources
885 **/
886
887 void
888 ixgb_free_tx_resources(struct ixgb_adapter *adapter)
889 {
890 struct pci_dev *pdev = adapter->pdev;
891
892 ixgb_clean_tx_ring(adapter);
893
894 vfree(adapter->tx_ring.buffer_info);
895 adapter->tx_ring.buffer_info = NULL;
896
897 dma_free_coherent(&pdev->dev, adapter->tx_ring.size,
898 adapter->tx_ring.desc, adapter->tx_ring.dma);
899
900 adapter->tx_ring.desc = NULL;
901 }
902
903 static void
904 ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
905 struct ixgb_buffer *buffer_info)
906 {
907 if (buffer_info->dma) {
908 if (buffer_info->mapped_as_page)
909 dma_unmap_page(&adapter->pdev->dev, buffer_info->dma,
910 buffer_info->length, DMA_TO_DEVICE);
911 else
912 dma_unmap_single(&adapter->pdev->dev, buffer_info->dma,
913 buffer_info->length, DMA_TO_DEVICE);
914 buffer_info->dma = 0;
915 }
916
917 if (buffer_info->skb) {
918 dev_kfree_skb_any(buffer_info->skb);
919 buffer_info->skb = NULL;
920 }
921 buffer_info->time_stamp = 0;
922 /* these fields must always be initialized in tx
923 * buffer_info->length = 0;
924 * buffer_info->next_to_watch = 0; */
925 }
926
927 /**
928 * ixgb_clean_tx_ring - Free Tx Buffers
929 * @adapter: board private structure
930 **/
931
932 static void
933 ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
934 {
935 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
936 struct ixgb_buffer *buffer_info;
937 unsigned long size;
938 unsigned int i;
939
940 /* Free all the Tx ring sk_buffs */
941
942 for (i = 0; i < tx_ring->count; i++) {
943 buffer_info = &tx_ring->buffer_info[i];
944 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
945 }
946
947 size = sizeof(struct ixgb_buffer) * tx_ring->count;
948 memset(tx_ring->buffer_info, 0, size);
949
950 /* Zero out the descriptor ring */
951
952 memset(tx_ring->desc, 0, tx_ring->size);
953
954 tx_ring->next_to_use = 0;
955 tx_ring->next_to_clean = 0;
956
957 IXGB_WRITE_REG(&adapter->hw, TDH, 0);
958 IXGB_WRITE_REG(&adapter->hw, TDT, 0);
959 }
960
961 /**
962 * ixgb_free_rx_resources - Free Rx Resources
963 * @adapter: board private structure
964 *
965 * Free all receive software resources
966 **/
967
968 void
969 ixgb_free_rx_resources(struct ixgb_adapter *adapter)
970 {
971 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
972 struct pci_dev *pdev = adapter->pdev;
973
974 ixgb_clean_rx_ring(adapter);
975
976 vfree(rx_ring->buffer_info);
977 rx_ring->buffer_info = NULL;
978
979 dma_free_coherent(&pdev->dev, rx_ring->size, rx_ring->desc,
980 rx_ring->dma);
981
982 rx_ring->desc = NULL;
983 }
984
985 /**
986 * ixgb_clean_rx_ring - Free Rx Buffers
987 * @adapter: board private structure
988 **/
989
990 static void
991 ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
992 {
993 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
994 struct ixgb_buffer *buffer_info;
995 struct pci_dev *pdev = adapter->pdev;
996 unsigned long size;
997 unsigned int i;
998
999 /* Free all the Rx ring sk_buffs */
1000
1001 for (i = 0; i < rx_ring->count; i++) {
1002 buffer_info = &rx_ring->buffer_info[i];
1003 if (buffer_info->dma) {
1004 dma_unmap_single(&pdev->dev,
1005 buffer_info->dma,
1006 buffer_info->length,
1007 DMA_FROM_DEVICE);
1008 buffer_info->dma = 0;
1009 buffer_info->length = 0;
1010 }
1011
1012 if (buffer_info->skb) {
1013 dev_kfree_skb(buffer_info->skb);
1014 buffer_info->skb = NULL;
1015 }
1016 }
1017
1018 size = sizeof(struct ixgb_buffer) * rx_ring->count;
1019 memset(rx_ring->buffer_info, 0, size);
1020
1021 /* Zero out the descriptor ring */
1022
1023 memset(rx_ring->desc, 0, rx_ring->size);
1024
1025 rx_ring->next_to_clean = 0;
1026 rx_ring->next_to_use = 0;
1027
1028 IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1029 IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1030 }
1031
1032 /**
1033 * ixgb_set_mac - Change the Ethernet Address of the NIC
1034 * @netdev: network interface device structure
1035 * @p: pointer to an address structure
1036 *
1037 * Returns 0 on success, negative on failure
1038 **/
1039
1040 static int
1041 ixgb_set_mac(struct net_device *netdev, void *p)
1042 {
1043 struct ixgb_adapter *adapter = netdev_priv(netdev);
1044 struct sockaddr *addr = p;
1045
1046 if (!is_valid_ether_addr(addr->sa_data))
1047 return -EADDRNOTAVAIL;
1048
1049 memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1050
1051 ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1052
1053 return 0;
1054 }
1055
1056 /**
1057 * ixgb_set_multi - Multicast and Promiscuous mode set
1058 * @netdev: network interface device structure
1059 *
1060 * The set_multi entry point is called whenever the multicast address
1061 * list or the network interface flags are updated. This routine is
1062 * responsible for configuring the hardware for proper multicast,
1063 * promiscuous mode, and all-multi behavior.
1064 **/
1065
1066 static void
1067 ixgb_set_multi(struct net_device *netdev)
1068 {
1069 struct ixgb_adapter *adapter = netdev_priv(netdev);
1070 struct ixgb_hw *hw = &adapter->hw;
1071 struct netdev_hw_addr *ha;
1072 u32 rctl;
1073 int i;
1074
1075 /* Check for Promiscuous and All Multicast modes */
1076
1077 rctl = IXGB_READ_REG(hw, RCTL);
1078
1079 if (netdev->flags & IFF_PROMISC) {
1080 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1081 /* disable VLAN filtering */
1082 rctl &= ~IXGB_RCTL_CFIEN;
1083 rctl &= ~IXGB_RCTL_VFE;
1084 } else {
1085 if (netdev->flags & IFF_ALLMULTI) {
1086 rctl |= IXGB_RCTL_MPE;
1087 rctl &= ~IXGB_RCTL_UPE;
1088 } else {
1089 rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1090 }
1091 /* enable VLAN filtering */
1092 rctl |= IXGB_RCTL_VFE;
1093 rctl &= ~IXGB_RCTL_CFIEN;
1094 }
1095
1096 if (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1097 rctl |= IXGB_RCTL_MPE;
1098 IXGB_WRITE_REG(hw, RCTL, rctl);
1099 } else {
1100 u8 mta[IXGB_MAX_NUM_MULTICAST_ADDRESSES *
1101 IXGB_ETH_LENGTH_OF_ADDRESS];
1102
1103 IXGB_WRITE_REG(hw, RCTL, rctl);
1104
1105 i = 0;
1106 netdev_for_each_mc_addr(ha, netdev)
1107 memcpy(&mta[i++ * IXGB_ETH_LENGTH_OF_ADDRESS],
1108 ha->addr, IXGB_ETH_LENGTH_OF_ADDRESS);
1109
1110 ixgb_mc_addr_list_update(hw, mta, netdev_mc_count(netdev), 0);
1111 }
1112
1113 if (netdev->features & NETIF_F_HW_VLAN_RX)
1114 ixgb_vlan_strip_enable(adapter);
1115 else
1116 ixgb_vlan_strip_disable(adapter);
1117
1118 }
1119
1120 /**
1121 * ixgb_watchdog - Timer Call-back
1122 * @data: pointer to netdev cast into an unsigned long
1123 **/
1124
1125 static void
1126 ixgb_watchdog(unsigned long data)
1127 {
1128 struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
1129 struct net_device *netdev = adapter->netdev;
1130 struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1131
1132 ixgb_check_for_link(&adapter->hw);
1133
1134 if (ixgb_check_for_bad_link(&adapter->hw)) {
1135 /* force the reset path */
1136 netif_stop_queue(netdev);
1137 }
1138
1139 if (adapter->hw.link_up) {
1140 if (!netif_carrier_ok(netdev)) {
1141 netdev_info(netdev,
1142 "NIC Link is Up 10 Gbps Full Duplex, Flow Control: %s\n",
1143 (adapter->hw.fc.type == ixgb_fc_full) ?
1144 "RX/TX" :
1145 (adapter->hw.fc.type == ixgb_fc_rx_pause) ?
1146 "RX" :
1147 (adapter->hw.fc.type == ixgb_fc_tx_pause) ?
1148 "TX" : "None");
1149 adapter->link_speed = 10000;
1150 adapter->link_duplex = FULL_DUPLEX;
1151 netif_carrier_on(netdev);
1152 }
1153 } else {
1154 if (netif_carrier_ok(netdev)) {
1155 adapter->link_speed = 0;
1156 adapter->link_duplex = 0;
1157 netdev_info(netdev, "NIC Link is Down\n");
1158 netif_carrier_off(netdev);
1159 }
1160 }
1161
1162 ixgb_update_stats(adapter);
1163
1164 if (!netif_carrier_ok(netdev)) {
1165 if (IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1166 /* We've lost link, so the controller stops DMA,
1167 * but we've got queued Tx work that's never going
1168 * to get done, so reset controller to flush Tx.
1169 * (Do the reset outside of interrupt context). */
1170 schedule_work(&adapter->tx_timeout_task);
1171 /* return immediately since reset is imminent */
1172 return;
1173 }
1174 }
1175
1176 /* Force detection of hung controller every watchdog period */
1177 adapter->detect_tx_hung = true;
1178
1179 /* generate an interrupt to force clean up of any stragglers */
1180 IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1181
1182 /* Reset the timer */
1183 mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1184 }
1185
1186 #define IXGB_TX_FLAGS_CSUM 0x00000001
1187 #define IXGB_TX_FLAGS_VLAN 0x00000002
1188 #define IXGB_TX_FLAGS_TSO 0x00000004
1189
1190 static int
1191 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1192 {
1193 struct ixgb_context_desc *context_desc;
1194 unsigned int i;
1195 u8 ipcss, ipcso, tucss, tucso, hdr_len;
1196 u16 ipcse, tucse, mss;
1197 int err;
1198
1199 if (likely(skb_is_gso(skb))) {
1200 struct ixgb_buffer *buffer_info;
1201 struct iphdr *iph;
1202
1203 if (skb_header_cloned(skb)) {
1204 err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1205 if (err)
1206 return err;
1207 }
1208
1209 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
1210 mss = skb_shinfo(skb)->gso_size;
1211 iph = ip_hdr(skb);
1212 iph->tot_len = 0;
1213 iph->check = 0;
1214 tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
1215 iph->daddr, 0,
1216 IPPROTO_TCP, 0);
1217 ipcss = skb_network_offset(skb);
1218 ipcso = (void *)&(iph->check) - (void *)skb->data;
1219 ipcse = skb_transport_offset(skb) - 1;
1220 tucss = skb_transport_offset(skb);
1221 tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data;
1222 tucse = 0;
1223
1224 i = adapter->tx_ring.next_to_use;
1225 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1226 buffer_info = &adapter->tx_ring.buffer_info[i];
1227 WARN_ON(buffer_info->dma != 0);
1228
1229 context_desc->ipcss = ipcss;
1230 context_desc->ipcso = ipcso;
1231 context_desc->ipcse = cpu_to_le16(ipcse);
1232 context_desc->tucss = tucss;
1233 context_desc->tucso = tucso;
1234 context_desc->tucse = cpu_to_le16(tucse);
1235 context_desc->mss = cpu_to_le16(mss);
1236 context_desc->hdr_len = hdr_len;
1237 context_desc->status = 0;
1238 context_desc->cmd_type_len = cpu_to_le32(
1239 IXGB_CONTEXT_DESC_TYPE
1240 | IXGB_CONTEXT_DESC_CMD_TSE
1241 | IXGB_CONTEXT_DESC_CMD_IP
1242 | IXGB_CONTEXT_DESC_CMD_TCP
1243 | IXGB_CONTEXT_DESC_CMD_IDE
1244 | (skb->len - (hdr_len)));
1245
1246
1247 if (++i == adapter->tx_ring.count) i = 0;
1248 adapter->tx_ring.next_to_use = i;
1249
1250 return 1;
1251 }
1252
1253 return 0;
1254 }
1255
1256 static bool
1257 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1258 {
1259 struct ixgb_context_desc *context_desc;
1260 unsigned int i;
1261 u8 css, cso;
1262
1263 if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
1264 struct ixgb_buffer *buffer_info;
1265 css = skb_checksum_start_offset(skb);
1266 cso = css + skb->csum_offset;
1267
1268 i = adapter->tx_ring.next_to_use;
1269 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1270 buffer_info = &adapter->tx_ring.buffer_info[i];
1271 WARN_ON(buffer_info->dma != 0);
1272
1273 context_desc->tucss = css;
1274 context_desc->tucso = cso;
1275 context_desc->tucse = 0;
1276 /* zero out any previously existing data in one instruction */
1277 *(u32 *)&(context_desc->ipcss) = 0;
1278 context_desc->status = 0;
1279 context_desc->hdr_len = 0;
1280 context_desc->mss = 0;
1281 context_desc->cmd_type_len =
1282 cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1283 | IXGB_TX_DESC_CMD_IDE);
1284
1285 if (++i == adapter->tx_ring.count) i = 0;
1286 adapter->tx_ring.next_to_use = i;
1287
1288 return true;
1289 }
1290
1291 return false;
1292 }
1293
1294 #define IXGB_MAX_TXD_PWR 14
1295 #define IXGB_MAX_DATA_PER_TXD (1<<IXGB_MAX_TXD_PWR)
1296
1297 static int
1298 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1299 unsigned int first)
1300 {
1301 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1302 struct pci_dev *pdev = adapter->pdev;
1303 struct ixgb_buffer *buffer_info;
1304 int len = skb_headlen(skb);
1305 unsigned int offset = 0, size, count = 0, i;
1306 unsigned int mss = skb_shinfo(skb)->gso_size;
1307 unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1308 unsigned int f;
1309
1310 i = tx_ring->next_to_use;
1311
1312 while (len) {
1313 buffer_info = &tx_ring->buffer_info[i];
1314 size = min(len, IXGB_MAX_DATA_PER_TXD);
1315 /* Workaround for premature desc write-backs
1316 * in TSO mode. Append 4-byte sentinel desc */
1317 if (unlikely(mss && !nr_frags && size == len && size > 8))
1318 size -= 4;
1319
1320 buffer_info->length = size;
1321 WARN_ON(buffer_info->dma != 0);
1322 buffer_info->time_stamp = jiffies;
1323 buffer_info->mapped_as_page = false;
1324 buffer_info->dma = dma_map_single(&pdev->dev,
1325 skb->data + offset,
1326 size, DMA_TO_DEVICE);
1327 if (dma_mapping_error(&pdev->dev, buffer_info->dma))
1328 goto dma_error;
1329 buffer_info->next_to_watch = 0;
1330
1331 len -= size;
1332 offset += size;
1333 count++;
1334 if (len) {
1335 i++;
1336 if (i == tx_ring->count)
1337 i = 0;
1338 }
1339 }
1340
1341 for (f = 0; f < nr_frags; f++) {
1342 struct skb_frag_struct *frag;
1343
1344 frag = &skb_shinfo(skb)->frags[f];
1345 len = frag->size;
1346 offset = frag->page_offset;
1347
1348 while (len) {
1349 i++;
1350 if (i == tx_ring->count)
1351 i = 0;
1352
1353 buffer_info = &tx_ring->buffer_info[i];
1354 size = min(len, IXGB_MAX_DATA_PER_TXD);
1355
1356 /* Workaround for premature desc write-backs
1357 * in TSO mode. Append 4-byte sentinel desc */
1358 if (unlikely(mss && (f == (nr_frags - 1))
1359 && size == len && size > 8))
1360 size -= 4;
1361
1362 buffer_info->length = size;
1363 buffer_info->time_stamp = jiffies;
1364 buffer_info->mapped_as_page = true;
1365 buffer_info->dma =
1366 dma_map_page(&pdev->dev, frag->page,
1367 offset, size, DMA_TO_DEVICE);
1368 if (dma_mapping_error(&pdev->dev, buffer_info->dma))
1369 goto dma_error;
1370 buffer_info->next_to_watch = 0;
1371
1372 len -= size;
1373 offset += size;
1374 count++;
1375 }
1376 }
1377 tx_ring->buffer_info[i].skb = skb;
1378 tx_ring->buffer_info[first].next_to_watch = i;
1379
1380 return count;
1381
1382 dma_error:
1383 dev_err(&pdev->dev, "TX DMA map failed\n");
1384 buffer_info->dma = 0;
1385 if (count)
1386 count--;
1387
1388 while (count--) {
1389 if (i==0)
1390 i += tx_ring->count;
1391 i--;
1392 buffer_info = &tx_ring->buffer_info[i];
1393 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1394 }
1395
1396 return 0;
1397 }
1398
1399 static void
1400 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1401 {
1402 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1403 struct ixgb_tx_desc *tx_desc = NULL;
1404 struct ixgb_buffer *buffer_info;
1405 u32 cmd_type_len = adapter->tx_cmd_type;
1406 u8 status = 0;
1407 u8 popts = 0;
1408 unsigned int i;
1409
1410 if (tx_flags & IXGB_TX_FLAGS_TSO) {
1411 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1412 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1413 }
1414
1415 if (tx_flags & IXGB_TX_FLAGS_CSUM)
1416 popts |= IXGB_TX_DESC_POPTS_TXSM;
1417
1418 if (tx_flags & IXGB_TX_FLAGS_VLAN)
1419 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1420
1421 i = tx_ring->next_to_use;
1422
1423 while (count--) {
1424 buffer_info = &tx_ring->buffer_info[i];
1425 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1426 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1427 tx_desc->cmd_type_len =
1428 cpu_to_le32(cmd_type_len | buffer_info->length);
1429 tx_desc->status = status;
1430 tx_desc->popts = popts;
1431 tx_desc->vlan = cpu_to_le16(vlan_id);
1432
1433 if (++i == tx_ring->count) i = 0;
1434 }
1435
1436 tx_desc->cmd_type_len |=
1437 cpu_to_le32(IXGB_TX_DESC_CMD_EOP | IXGB_TX_DESC_CMD_RS);
1438
1439 /* Force memory writes to complete before letting h/w
1440 * know there are new descriptors to fetch. (Only
1441 * applicable for weak-ordered memory model archs,
1442 * such as IA-64). */
1443 wmb();
1444
1445 tx_ring->next_to_use = i;
1446 IXGB_WRITE_REG(&adapter->hw, TDT, i);
1447 }
1448
1449 static int __ixgb_maybe_stop_tx(struct net_device *netdev, int size)
1450 {
1451 struct ixgb_adapter *adapter = netdev_priv(netdev);
1452 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1453
1454 netif_stop_queue(netdev);
1455 /* Herbert's original patch had:
1456 * smp_mb__after_netif_stop_queue();
1457 * but since that doesn't exist yet, just open code it. */
1458 smp_mb();
1459
1460 /* We need to check again in a case another CPU has just
1461 * made room available. */
1462 if (likely(IXGB_DESC_UNUSED(tx_ring) < size))
1463 return -EBUSY;
1464
1465 /* A reprieve! */
1466 netif_start_queue(netdev);
1467 ++adapter->restart_queue;
1468 return 0;
1469 }
1470
1471 static int ixgb_maybe_stop_tx(struct net_device *netdev,
1472 struct ixgb_desc_ring *tx_ring, int size)
1473 {
1474 if (likely(IXGB_DESC_UNUSED(tx_ring) >= size))
1475 return 0;
1476 return __ixgb_maybe_stop_tx(netdev, size);
1477 }
1478
1479
1480 /* Tx Descriptors needed, worst case */
1481 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1482 (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1483 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) /* skb->date */ + \
1484 MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 /* for context */ \
1485 + 1 /* one more needed for sentinel TSO workaround */
1486
1487 static netdev_tx_t
1488 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1489 {
1490 struct ixgb_adapter *adapter = netdev_priv(netdev);
1491 unsigned int first;
1492 unsigned int tx_flags = 0;
1493 int vlan_id = 0;
1494 int count = 0;
1495 int tso;
1496
1497 if (test_bit(__IXGB_DOWN, &adapter->flags)) {
1498 dev_kfree_skb(skb);
1499 return NETDEV_TX_OK;
1500 }
1501
1502 if (skb->len <= 0) {
1503 dev_kfree_skb(skb);
1504 return NETDEV_TX_OK;
1505 }
1506
1507 if (unlikely(ixgb_maybe_stop_tx(netdev, &adapter->tx_ring,
1508 DESC_NEEDED)))
1509 return NETDEV_TX_BUSY;
1510
1511 if (adapter->vlgrp && vlan_tx_tag_present(skb)) {
1512 tx_flags |= IXGB_TX_FLAGS_VLAN;
1513 vlan_id = vlan_tx_tag_get(skb);
1514 }
1515
1516 first = adapter->tx_ring.next_to_use;
1517
1518 tso = ixgb_tso(adapter, skb);
1519 if (tso < 0) {
1520 dev_kfree_skb(skb);
1521 return NETDEV_TX_OK;
1522 }
1523
1524 if (likely(tso))
1525 tx_flags |= IXGB_TX_FLAGS_TSO;
1526 else if (ixgb_tx_csum(adapter, skb))
1527 tx_flags |= IXGB_TX_FLAGS_CSUM;
1528
1529 count = ixgb_tx_map(adapter, skb, first);
1530
1531 if (count) {
1532 ixgb_tx_queue(adapter, count, vlan_id, tx_flags);
1533 /* Make sure there is space in the ring for the next send. */
1534 ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED);
1535
1536 } else {
1537 dev_kfree_skb_any(skb);
1538 adapter->tx_ring.buffer_info[first].time_stamp = 0;
1539 adapter->tx_ring.next_to_use = first;
1540 }
1541
1542 return NETDEV_TX_OK;
1543 }
1544
1545 /**
1546 * ixgb_tx_timeout - Respond to a Tx Hang
1547 * @netdev: network interface device structure
1548 **/
1549
1550 static void
1551 ixgb_tx_timeout(struct net_device *netdev)
1552 {
1553 struct ixgb_adapter *adapter = netdev_priv(netdev);
1554
1555 /* Do the reset outside of interrupt context */
1556 schedule_work(&adapter->tx_timeout_task);
1557 }
1558
1559 static void
1560 ixgb_tx_timeout_task(struct work_struct *work)
1561 {
1562 struct ixgb_adapter *adapter =
1563 container_of(work, struct ixgb_adapter, tx_timeout_task);
1564
1565 adapter->tx_timeout_count++;
1566 ixgb_down(adapter, true);
1567 ixgb_up(adapter);
1568 }
1569
1570 /**
1571 * ixgb_get_stats - Get System Network Statistics
1572 * @netdev: network interface device structure
1573 *
1574 * Returns the address of the device statistics structure.
1575 * The statistics are actually updated from the timer callback.
1576 **/
1577
1578 static struct net_device_stats *
1579 ixgb_get_stats(struct net_device *netdev)
1580 {
1581 return &netdev->stats;
1582 }
1583
1584 /**
1585 * ixgb_change_mtu - Change the Maximum Transfer Unit
1586 * @netdev: network interface device structure
1587 * @new_mtu: new value for maximum frame size
1588 *
1589 * Returns 0 on success, negative on failure
1590 **/
1591
1592 static int
1593 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1594 {
1595 struct ixgb_adapter *adapter = netdev_priv(netdev);
1596 int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1597 int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1598
1599 /* MTU < 68 is an error for IPv4 traffic, just don't allow it */
1600 if ((new_mtu < 68) ||
1601 (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
1602 netif_err(adapter, probe, adapter->netdev,
1603 "Invalid MTU setting %d\n", new_mtu);
1604 return -EINVAL;
1605 }
1606
1607 if (old_max_frame == max_frame)
1608 return 0;
1609
1610 if (netif_running(netdev))
1611 ixgb_down(adapter, true);
1612
1613 adapter->rx_buffer_len = max_frame + 8; /* + 8 for errata */
1614
1615 netdev->mtu = new_mtu;
1616
1617 if (netif_running(netdev))
1618 ixgb_up(adapter);
1619
1620 return 0;
1621 }
1622
1623 /**
1624 * ixgb_update_stats - Update the board statistics counters.
1625 * @adapter: board private structure
1626 **/
1627
1628 void
1629 ixgb_update_stats(struct ixgb_adapter *adapter)
1630 {
1631 struct net_device *netdev = adapter->netdev;
1632 struct pci_dev *pdev = adapter->pdev;
1633
1634 /* Prevent stats update while adapter is being reset */
1635 if (pci_channel_offline(pdev))
1636 return;
1637
1638 if ((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1639 (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1640 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1641 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1642 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1643 u64 bcast = ((u64)bcast_h << 32) | bcast_l;
1644
1645 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1646 /* fix up multicast stats by removing broadcasts */
1647 if (multi >= bcast)
1648 multi -= bcast;
1649
1650 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1651 adapter->stats.mprch += (multi >> 32);
1652 adapter->stats.bprcl += bcast_l;
1653 adapter->stats.bprch += bcast_h;
1654 } else {
1655 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1656 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1657 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1658 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1659 }
1660 adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1661 adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1662 adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1663 adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1664 adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1665 adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1666 adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1667 adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1668 adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1669 adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1670 adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1671 adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1672 adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1673 adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1674 adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1675 adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1676 adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1677 adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1678 adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1679 adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1680 adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1681 adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1682 adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1683 adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1684 adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1685 adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1686 adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1687 adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1688 adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1689 adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1690 adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1691 adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1692 adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1693 adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1694 adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1695 adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1696 adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1697 adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1698 adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1699 adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1700 adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1701 adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1702 adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1703 adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1704 adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1705 adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1706 adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1707 adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1708 adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1709 adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1710 adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1711 adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1712 adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1713 adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1714 adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1715 adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1716
1717 /* Fill out the OS statistics structure */
1718
1719 netdev->stats.rx_packets = adapter->stats.gprcl;
1720 netdev->stats.tx_packets = adapter->stats.gptcl;
1721 netdev->stats.rx_bytes = adapter->stats.gorcl;
1722 netdev->stats.tx_bytes = adapter->stats.gotcl;
1723 netdev->stats.multicast = adapter->stats.mprcl;
1724 netdev->stats.collisions = 0;
1725
1726 /* ignore RLEC as it reports errors for padded (<64bytes) frames
1727 * with a length in the type/len field */
1728 netdev->stats.rx_errors =
1729 /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1730 adapter->stats.ruc +
1731 adapter->stats.roc /*+ adapter->stats.rlec */ +
1732 adapter->stats.icbc +
1733 adapter->stats.ecbc + adapter->stats.mpc;
1734
1735 /* see above
1736 * netdev->stats.rx_length_errors = adapter->stats.rlec;
1737 */
1738
1739 netdev->stats.rx_crc_errors = adapter->stats.crcerrs;
1740 netdev->stats.rx_fifo_errors = adapter->stats.mpc;
1741 netdev->stats.rx_missed_errors = adapter->stats.mpc;
1742 netdev->stats.rx_over_errors = adapter->stats.mpc;
1743
1744 netdev->stats.tx_errors = 0;
1745 netdev->stats.rx_frame_errors = 0;
1746 netdev->stats.tx_aborted_errors = 0;
1747 netdev->stats.tx_carrier_errors = 0;
1748 netdev->stats.tx_fifo_errors = 0;
1749 netdev->stats.tx_heartbeat_errors = 0;
1750 netdev->stats.tx_window_errors = 0;
1751 }
1752
1753 #define IXGB_MAX_INTR 10
1754 /**
1755 * ixgb_intr - Interrupt Handler
1756 * @irq: interrupt number
1757 * @data: pointer to a network interface device structure
1758 **/
1759
1760 static irqreturn_t
1761 ixgb_intr(int irq, void *data)
1762 {
1763 struct net_device *netdev = data;
1764 struct ixgb_adapter *adapter = netdev_priv(netdev);
1765 struct ixgb_hw *hw = &adapter->hw;
1766 u32 icr = IXGB_READ_REG(hw, ICR);
1767
1768 if (unlikely(!icr))
1769 return IRQ_NONE; /* Not our interrupt */
1770
1771 if (unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC)))
1772 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1773 mod_timer(&adapter->watchdog_timer, jiffies);
1774
1775 if (napi_schedule_prep(&adapter->napi)) {
1776
1777 /* Disable interrupts and register for poll. The flush
1778 of the posted write is intentionally left out.
1779 */
1780
1781 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1782 __napi_schedule(&adapter->napi);
1783 }
1784 return IRQ_HANDLED;
1785 }
1786
1787 /**
1788 * ixgb_clean - NAPI Rx polling callback
1789 * @adapter: board private structure
1790 **/
1791
1792 static int
1793 ixgb_clean(struct napi_struct *napi, int budget)
1794 {
1795 struct ixgb_adapter *adapter = container_of(napi, struct ixgb_adapter, napi);
1796 int work_done = 0;
1797
1798 ixgb_clean_tx_irq(adapter);
1799 ixgb_clean_rx_irq(adapter, &work_done, budget);
1800
1801 /* If budget not fully consumed, exit the polling mode */
1802 if (work_done < budget) {
1803 napi_complete(napi);
1804 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1805 ixgb_irq_enable(adapter);
1806 }
1807
1808 return work_done;
1809 }
1810
1811 /**
1812 * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1813 * @adapter: board private structure
1814 **/
1815
1816 static bool
1817 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1818 {
1819 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1820 struct net_device *netdev = adapter->netdev;
1821 struct ixgb_tx_desc *tx_desc, *eop_desc;
1822 struct ixgb_buffer *buffer_info;
1823 unsigned int i, eop;
1824 bool cleaned = false;
1825
1826 i = tx_ring->next_to_clean;
1827 eop = tx_ring->buffer_info[i].next_to_watch;
1828 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1829
1830 while (eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1831
1832 rmb(); /* read buffer_info after eop_desc */
1833 for (cleaned = false; !cleaned; ) {
1834 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1835 buffer_info = &tx_ring->buffer_info[i];
1836
1837 if (tx_desc->popts &
1838 (IXGB_TX_DESC_POPTS_TXSM |
1839 IXGB_TX_DESC_POPTS_IXSM))
1840 adapter->hw_csum_tx_good++;
1841
1842 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1843
1844 *(u32 *)&(tx_desc->status) = 0;
1845
1846 cleaned = (i == eop);
1847 if (++i == tx_ring->count) i = 0;
1848 }
1849
1850 eop = tx_ring->buffer_info[i].next_to_watch;
1851 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1852 }
1853
1854 tx_ring->next_to_clean = i;
1855
1856 if (unlikely(cleaned && netif_carrier_ok(netdev) &&
1857 IXGB_DESC_UNUSED(tx_ring) >= DESC_NEEDED)) {
1858 /* Make sure that anybody stopping the queue after this
1859 * sees the new next_to_clean. */
1860 smp_mb();
1861
1862 if (netif_queue_stopped(netdev) &&
1863 !(test_bit(__IXGB_DOWN, &adapter->flags))) {
1864 netif_wake_queue(netdev);
1865 ++adapter->restart_queue;
1866 }
1867 }
1868
1869 if (adapter->detect_tx_hung) {
1870 /* detect a transmit hang in hardware, this serializes the
1871 * check with the clearing of time_stamp and movement of i */
1872 adapter->detect_tx_hung = false;
1873 if (tx_ring->buffer_info[eop].time_stamp &&
1874 time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ)
1875 && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1876 IXGB_STATUS_TXOFF)) {
1877 /* detected Tx unit hang */
1878 netif_err(adapter, drv, adapter->netdev,
1879 "Detected Tx Unit Hang\n"
1880 " TDH <%x>\n"
1881 " TDT <%x>\n"
1882 " next_to_use <%x>\n"
1883 " next_to_clean <%x>\n"
1884 "buffer_info[next_to_clean]\n"
1885 " time_stamp <%lx>\n"
1886 " next_to_watch <%x>\n"
1887 " jiffies <%lx>\n"
1888 " next_to_watch.status <%x>\n",
1889 IXGB_READ_REG(&adapter->hw, TDH),
1890 IXGB_READ_REG(&adapter->hw, TDT),
1891 tx_ring->next_to_use,
1892 tx_ring->next_to_clean,
1893 tx_ring->buffer_info[eop].time_stamp,
1894 eop,
1895 jiffies,
1896 eop_desc->status);
1897 netif_stop_queue(netdev);
1898 }
1899 }
1900
1901 return cleaned;
1902 }
1903
1904 /**
1905 * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1906 * @adapter: board private structure
1907 * @rx_desc: receive descriptor
1908 * @sk_buff: socket buffer with received data
1909 **/
1910
1911 static void
1912 ixgb_rx_checksum(struct ixgb_adapter *adapter,
1913 struct ixgb_rx_desc *rx_desc,
1914 struct sk_buff *skb)
1915 {
1916 /* Ignore Checksum bit is set OR
1917 * TCP Checksum has not been calculated
1918 */
1919 if ((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1920 (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1921 skb_checksum_none_assert(skb);
1922 return;
1923 }
1924
1925 /* At this point we know the hardware did the TCP checksum */
1926 /* now look at the TCP checksum error bit */
1927 if (rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1928 /* let the stack verify checksum errors */
1929 skb_checksum_none_assert(skb);
1930 adapter->hw_csum_rx_error++;
1931 } else {
1932 /* TCP checksum is good */
1933 skb->ip_summed = CHECKSUM_UNNECESSARY;
1934 adapter->hw_csum_rx_good++;
1935 }
1936 }
1937
1938 /*
1939 * this should improve performance for small packets with large amounts
1940 * of reassembly being done in the stack
1941 */
1942 static void ixgb_check_copybreak(struct net_device *netdev,
1943 struct ixgb_buffer *buffer_info,
1944 u32 length, struct sk_buff **skb)
1945 {
1946 struct sk_buff *new_skb;
1947
1948 if (length > copybreak)
1949 return;
1950
1951 new_skb = netdev_alloc_skb_ip_align(netdev, length);
1952 if (!new_skb)
1953 return;
1954
1955 skb_copy_to_linear_data_offset(new_skb, -NET_IP_ALIGN,
1956 (*skb)->data - NET_IP_ALIGN,
1957 length + NET_IP_ALIGN);
1958 /* save the skb in buffer_info as good */
1959 buffer_info->skb = *skb;
1960 *skb = new_skb;
1961 }
1962
1963 /**
1964 * ixgb_clean_rx_irq - Send received data up the network stack,
1965 * @adapter: board private structure
1966 **/
1967
1968 static bool
1969 ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
1970 {
1971 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1972 struct net_device *netdev = adapter->netdev;
1973 struct pci_dev *pdev = adapter->pdev;
1974 struct ixgb_rx_desc *rx_desc, *next_rxd;
1975 struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
1976 u32 length;
1977 unsigned int i, j;
1978 int cleaned_count = 0;
1979 bool cleaned = false;
1980
1981 i = rx_ring->next_to_clean;
1982 rx_desc = IXGB_RX_DESC(*rx_ring, i);
1983 buffer_info = &rx_ring->buffer_info[i];
1984
1985 while (rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
1986 struct sk_buff *skb;
1987 u8 status;
1988
1989 if (*work_done >= work_to_do)
1990 break;
1991
1992 (*work_done)++;
1993 rmb(); /* read descriptor and rx_buffer_info after status DD */
1994 status = rx_desc->status;
1995 skb = buffer_info->skb;
1996 buffer_info->skb = NULL;
1997
1998 prefetch(skb->data - NET_IP_ALIGN);
1999
2000 if (++i == rx_ring->count)
2001 i = 0;
2002 next_rxd = IXGB_RX_DESC(*rx_ring, i);
2003 prefetch(next_rxd);
2004
2005 j = i + 1;
2006 if (j == rx_ring->count)
2007 j = 0;
2008 next2_buffer = &rx_ring->buffer_info[j];
2009 prefetch(next2_buffer);
2010
2011 next_buffer = &rx_ring->buffer_info[i];
2012
2013 cleaned = true;
2014 cleaned_count++;
2015
2016 dma_unmap_single(&pdev->dev,
2017 buffer_info->dma,
2018 buffer_info->length,
2019 DMA_FROM_DEVICE);
2020 buffer_info->dma = 0;
2021
2022 length = le16_to_cpu(rx_desc->length);
2023 rx_desc->length = 0;
2024
2025 if (unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
2026
2027 /* All receives must fit into a single buffer */
2028
2029 IXGB_DBG("Receive packet consumed multiple buffers "
2030 "length<%x>\n", length);
2031
2032 dev_kfree_skb_irq(skb);
2033 goto rxdesc_done;
2034 }
2035
2036 if (unlikely(rx_desc->errors &
2037 (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE |
2038 IXGB_RX_DESC_ERRORS_P | IXGB_RX_DESC_ERRORS_RXE))) {
2039 dev_kfree_skb_irq(skb);
2040 goto rxdesc_done;
2041 }
2042
2043 ixgb_check_copybreak(netdev, buffer_info, length, &skb);
2044
2045 /* Good Receive */
2046 skb_put(skb, length);
2047
2048 /* Receive Checksum Offload */
2049 ixgb_rx_checksum(adapter, rx_desc, skb);
2050
2051 skb->protocol = eth_type_trans(skb, netdev);
2052 if (adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
2053 vlan_hwaccel_receive_skb(skb, adapter->vlgrp,
2054 le16_to_cpu(rx_desc->special));
2055 } else {
2056 netif_receive_skb(skb);
2057 }
2058
2059 rxdesc_done:
2060 /* clean up descriptor, might be written over by hw */
2061 rx_desc->status = 0;
2062
2063 /* return some buffers to hardware, one at a time is too slow */
2064 if (unlikely(cleaned_count >= IXGB_RX_BUFFER_WRITE)) {
2065 ixgb_alloc_rx_buffers(adapter, cleaned_count);
2066 cleaned_count = 0;
2067 }
2068
2069 /* use prefetched values */
2070 rx_desc = next_rxd;
2071 buffer_info = next_buffer;
2072 }
2073
2074 rx_ring->next_to_clean = i;
2075
2076 cleaned_count = IXGB_DESC_UNUSED(rx_ring);
2077 if (cleaned_count)
2078 ixgb_alloc_rx_buffers(adapter, cleaned_count);
2079
2080 return cleaned;
2081 }
2082
2083 /**
2084 * ixgb_alloc_rx_buffers - Replace used receive buffers
2085 * @adapter: address of board private structure
2086 **/
2087
2088 static void
2089 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter, int cleaned_count)
2090 {
2091 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2092 struct net_device *netdev = adapter->netdev;
2093 struct pci_dev *pdev = adapter->pdev;
2094 struct ixgb_rx_desc *rx_desc;
2095 struct ixgb_buffer *buffer_info;
2096 struct sk_buff *skb;
2097 unsigned int i;
2098 long cleancount;
2099
2100 i = rx_ring->next_to_use;
2101 buffer_info = &rx_ring->buffer_info[i];
2102 cleancount = IXGB_DESC_UNUSED(rx_ring);
2103
2104
2105 /* leave three descriptors unused */
2106 while (--cleancount > 2 && cleaned_count--) {
2107 /* recycle! its good for you */
2108 skb = buffer_info->skb;
2109 if (skb) {
2110 skb_trim(skb, 0);
2111 goto map_skb;
2112 }
2113
2114 skb = netdev_alloc_skb_ip_align(netdev, adapter->rx_buffer_len);
2115 if (unlikely(!skb)) {
2116 /* Better luck next round */
2117 adapter->alloc_rx_buff_failed++;
2118 break;
2119 }
2120
2121 buffer_info->skb = skb;
2122 buffer_info->length = adapter->rx_buffer_len;
2123 map_skb:
2124 buffer_info->dma = dma_map_single(&pdev->dev,
2125 skb->data,
2126 adapter->rx_buffer_len,
2127 DMA_FROM_DEVICE);
2128
2129 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2130 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
2131 /* guarantee DD bit not set now before h/w gets descriptor
2132 * this is the rest of the workaround for h/w double
2133 * writeback. */
2134 rx_desc->status = 0;
2135
2136
2137 if (++i == rx_ring->count) i = 0;
2138 buffer_info = &rx_ring->buffer_info[i];
2139 }
2140
2141 if (likely(rx_ring->next_to_use != i)) {
2142 rx_ring->next_to_use = i;
2143 if (unlikely(i-- == 0))
2144 i = (rx_ring->count - 1);
2145
2146 /* Force memory writes to complete before letting h/w
2147 * know there are new descriptors to fetch. (Only
2148 * applicable for weak-ordered memory model archs, such
2149 * as IA-64). */
2150 wmb();
2151 IXGB_WRITE_REG(&adapter->hw, RDT, i);
2152 }
2153 }
2154
2155 /**
2156 * ixgb_vlan_rx_register - enables or disables vlan tagging/stripping.
2157 *
2158 * @param netdev network interface device structure
2159 * @param grp indicates to enable or disable tagging/stripping
2160 **/
2161 static void
2162 ixgb_vlan_rx_register(struct net_device *netdev, struct vlan_group *grp)
2163 {
2164 struct ixgb_adapter *adapter = netdev_priv(netdev);
2165
2166 adapter->vlgrp = grp;
2167 }
2168
2169 static void
2170 ixgb_vlan_strip_enable(struct ixgb_adapter *adapter)
2171 {
2172 u32 ctrl;
2173
2174 /* enable VLAN tag insert/strip */
2175 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2176 ctrl |= IXGB_CTRL0_VME;
2177 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2178 }
2179
2180 static void
2181 ixgb_vlan_strip_disable(struct ixgb_adapter *adapter)
2182 {
2183 u32 ctrl;
2184
2185 /* disable VLAN tag insert/strip */
2186 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2187 ctrl &= ~IXGB_CTRL0_VME;
2188 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2189 }
2190
2191 static void
2192 ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid)
2193 {
2194 struct ixgb_adapter *adapter = netdev_priv(netdev);
2195 u32 vfta, index;
2196
2197 /* add VID to filter table */
2198
2199 index = (vid >> 5) & 0x7F;
2200 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2201 vfta |= (1 << (vid & 0x1F));
2202 ixgb_write_vfta(&adapter->hw, index, vfta);
2203 }
2204
2205 static void
2206 ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid)
2207 {
2208 struct ixgb_adapter *adapter = netdev_priv(netdev);
2209 u32 vfta, index;
2210
2211 ixgb_irq_disable(adapter);
2212
2213 vlan_group_set_device(adapter->vlgrp, vid, NULL);
2214
2215 /* don't enable interrupts unless we are UP */
2216 if (adapter->netdev->flags & IFF_UP)
2217 ixgb_irq_enable(adapter);
2218
2219 /* remove VID from 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 }
2226
2227 static void
2228 ixgb_restore_vlan(struct ixgb_adapter *adapter)
2229 {
2230 ixgb_vlan_rx_register(adapter->netdev, adapter->vlgrp);
2231
2232 if (adapter->vlgrp) {
2233 u16 vid;
2234 for (vid = 0; vid < VLAN_N_VID; vid++) {
2235 if (!vlan_group_get_device(adapter->vlgrp, vid))
2236 continue;
2237 ixgb_vlan_rx_add_vid(adapter->netdev, vid);
2238 }
2239 }
2240 }
2241
2242 #ifdef CONFIG_NET_POLL_CONTROLLER
2243 /*
2244 * Polling 'interrupt' - used by things like netconsole to send skbs
2245 * without having to re-enable interrupts. It's not called while
2246 * the interrupt routine is executing.
2247 */
2248
2249 static void ixgb_netpoll(struct net_device *dev)
2250 {
2251 struct ixgb_adapter *adapter = netdev_priv(dev);
2252
2253 disable_irq(adapter->pdev->irq);
2254 ixgb_intr(adapter->pdev->irq, dev);
2255 enable_irq(adapter->pdev->irq);
2256 }
2257 #endif
2258
2259 /**
2260 * ixgb_io_error_detected() - called when PCI error is detected
2261 * @pdev pointer to pci device with error
2262 * @state pci channel state after error
2263 *
2264 * This callback is called by the PCI subsystem whenever
2265 * a PCI bus error is detected.
2266 */
2267 static pci_ers_result_t ixgb_io_error_detected(struct pci_dev *pdev,
2268 enum pci_channel_state state)
2269 {
2270 struct net_device *netdev = pci_get_drvdata(pdev);
2271 struct ixgb_adapter *adapter = netdev_priv(netdev);
2272
2273 netif_device_detach(netdev);
2274
2275 if (state == pci_channel_io_perm_failure)
2276 return PCI_ERS_RESULT_DISCONNECT;
2277
2278 if (netif_running(netdev))
2279 ixgb_down(adapter, true);
2280
2281 pci_disable_device(pdev);
2282
2283 /* Request a slot reset. */
2284 return PCI_ERS_RESULT_NEED_RESET;
2285 }
2286
2287 /**
2288 * ixgb_io_slot_reset - called after the pci bus has been reset.
2289 * @pdev pointer to pci device with error
2290 *
2291 * This callback is called after the PCI bus has been reset.
2292 * Basically, this tries to restart the card from scratch.
2293 * This is a shortened version of the device probe/discovery code,
2294 * it resembles the first-half of the ixgb_probe() routine.
2295 */
2296 static pci_ers_result_t ixgb_io_slot_reset(struct pci_dev *pdev)
2297 {
2298 struct net_device *netdev = pci_get_drvdata(pdev);
2299 struct ixgb_adapter *adapter = netdev_priv(netdev);
2300
2301 if (pci_enable_device(pdev)) {
2302 netif_err(adapter, probe, adapter->netdev,
2303 "Cannot re-enable PCI device after reset\n");
2304 return PCI_ERS_RESULT_DISCONNECT;
2305 }
2306
2307 /* Perform card reset only on one instance of the card */
2308 if (0 != PCI_FUNC (pdev->devfn))
2309 return PCI_ERS_RESULT_RECOVERED;
2310
2311 pci_set_master(pdev);
2312
2313 netif_carrier_off(netdev);
2314 netif_stop_queue(netdev);
2315 ixgb_reset(adapter);
2316
2317 /* Make sure the EEPROM is good */
2318 if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
2319 netif_err(adapter, probe, adapter->netdev,
2320 "After reset, the EEPROM checksum is not valid\n");
2321 return PCI_ERS_RESULT_DISCONNECT;
2322 }
2323 ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
2324 memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
2325
2326 if (!is_valid_ether_addr(netdev->perm_addr)) {
2327 netif_err(adapter, probe, adapter->netdev,
2328 "After reset, invalid MAC address\n");
2329 return PCI_ERS_RESULT_DISCONNECT;
2330 }
2331
2332 return PCI_ERS_RESULT_RECOVERED;
2333 }
2334
2335 /**
2336 * ixgb_io_resume - called when its OK to resume normal operations
2337 * @pdev pointer to pci device with error
2338 *
2339 * The error recovery driver tells us that its OK to resume
2340 * normal operation. Implementation resembles the second-half
2341 * of the ixgb_probe() routine.
2342 */
2343 static void ixgb_io_resume(struct pci_dev *pdev)
2344 {
2345 struct net_device *netdev = pci_get_drvdata(pdev);
2346 struct ixgb_adapter *adapter = netdev_priv(netdev);
2347
2348 pci_set_master(pdev);
2349
2350 if (netif_running(netdev)) {
2351 if (ixgb_up(adapter)) {
2352 pr_err("can't bring device back up after reset\n");
2353 return;
2354 }
2355 }
2356
2357 netif_device_attach(netdev);
2358 mod_timer(&adapter->watchdog_timer, jiffies);
2359 }
2360
2361 /* ixgb_main.c */
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree