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ixgb: eliminate checkstack warnings
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / net / ethernet / intel / ixgb / ixgb_main.c
blobca3ab4a29ac43d5276fc54ee1d68b1f4300848d6
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
34 char ixgb_driver_name[] = "ixgb";
35 static char ixgb_driver_string[] = "Intel(R) PRO/10GbE Network Driver";
36
37 #define DRIVERNAPI "-NAPI"
38 #define DRV_VERSION "1.0.135-k2" DRIVERNAPI
39 const char ixgb_driver_version[] = DRV_VERSION;
40 static const char ixgb_copyright[] = "Copyright (c) 1999-2008 Intel Corporation.";
41
42 #define IXGB_CB_LENGTH 256
43 static unsigned int copybreak __read_mostly = IXGB_CB_LENGTH;
44 module_param(copybreak, uint, 0644);
45 MODULE_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 */
56 static 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
70 MODULE_DEVICE_TABLE(pci, ixgb_pci_tbl);
71
72 /* Local Function Prototypes */
73 static int ixgb_init_module(void);
74 static void ixgb_exit_module(void);
75 static int ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
76 static void __devexit ixgb_remove(struct pci_dev *pdev);
77 static int ixgb_sw_init(struct ixgb_adapter *adapter);
78 static int ixgb_open(struct net_device *netdev);
79 static int ixgb_close(struct net_device *netdev);
80 static void ixgb_configure_tx(struct ixgb_adapter *adapter);
81 static void ixgb_configure_rx(struct ixgb_adapter *adapter);
82 static void ixgb_setup_rctl(struct ixgb_adapter *adapter);
83 static void ixgb_clean_tx_ring(struct ixgb_adapter *adapter);
84 static void ixgb_clean_rx_ring(struct ixgb_adapter *adapter);
85 static void ixgb_set_multi(struct net_device *netdev);
86 static void ixgb_watchdog(unsigned long data);
87 static netdev_tx_t ixgb_xmit_frame(struct sk_buff *skb,
88 struct net_device *netdev);
89 static struct net_device_stats *ixgb_get_stats(struct net_device *netdev);
90 static int ixgb_change_mtu(struct net_device *netdev, int new_mtu);
91 static int ixgb_set_mac(struct net_device *netdev, void *p);
92 static irqreturn_t ixgb_intr(int irq, void *data);
93 static bool ixgb_clean_tx_irq(struct ixgb_adapter *adapter);
94
95 static int ixgb_clean(struct napi_struct *, int);
96 static bool ixgb_clean_rx_irq(struct ixgb_adapter *, int *, int);
97 static void ixgb_alloc_rx_buffers(struct ixgb_adapter *, int);
98
99 static void ixgb_tx_timeout(struct net_device *dev);
100 static void ixgb_tx_timeout_task(struct work_struct *work);
101
102 static void ixgb_vlan_strip_enable(struct ixgb_adapter *adapter);
103 static void ixgb_vlan_strip_disable(struct ixgb_adapter *adapter);
104 static void ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid);
105 static void ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid);
106 static void ixgb_restore_vlan(struct ixgb_adapter *adapter);
107
108 #ifdef CONFIG_NET_POLL_CONTROLLER
109 /* for netdump / net console */
110 static void ixgb_netpoll(struct net_device *dev);
111 #endif
112
113 static pci_ers_result_t ixgb_io_error_detected (struct pci_dev *pdev,
114 enum pci_channel_state state);
115 static pci_ers_result_t ixgb_io_slot_reset (struct pci_dev *pdev);
116 static void ixgb_io_resume (struct pci_dev *pdev);
117
118 static 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
124 static 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
132 MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
133 MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver");
134 MODULE_LICENSE("GPL");
135 MODULE_VERSION(DRV_VERSION);
136
137 #define DEFAULT_DEBUG_LEVEL_SHIFT 3
138 static int debug = DEFAULT_DEBUG_LEVEL_SHIFT;
139 module_param(debug, int, 0);
140 MODULE_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
149 static int __init
150 ixgb_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
158 module_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
167 static void __exit
168 ixgb_exit_module(void)
169 {
170 pci_unregister_driver(&ixgb_driver);
171 }
172
173 module_exit(ixgb_exit_module);
174
175 /**
176 * ixgb_irq_disable - Mask off interrupt generation on the NIC
177 * @adapter: board private structure
178 **/
179
180 static void
181 ixgb_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
193 static void
194 ixgb_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
204 int
205 ixgb_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
278 void
279 ixgb_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
307 void
308 ixgb_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
328 static int
329 ixgb_set_features(struct net_device *netdev, u32 features)
330 {
331 struct ixgb_adapter *adapter = netdev_priv(netdev);
332 u32 changed = features ^ netdev->features;
333
334 if (!(changed & NETIF_F_RXCSUM))
335 return 0;
336
337 adapter->rx_csum = !!(features & NETIF_F_RXCSUM);
338
339 if (netif_running(netdev)) {
340 ixgb_down(adapter, true);
341 ixgb_up(adapter);
342 ixgb_set_speed_duplex(netdev);
343 } else
344 ixgb_reset(adapter);
345
346 return 0;
347 }
348
349
350 static const struct net_device_ops ixgb_netdev_ops = {
351 .ndo_open = ixgb_open,
352 .ndo_stop = ixgb_close,
353 .ndo_start_xmit = ixgb_xmit_frame,
354 .ndo_get_stats = ixgb_get_stats,
355 .ndo_set_rx_mode = ixgb_set_multi,
356 .ndo_validate_addr = eth_validate_addr,
357 .ndo_set_mac_address = ixgb_set_mac,
358 .ndo_change_mtu = ixgb_change_mtu,
359 .ndo_tx_timeout = ixgb_tx_timeout,
360 .ndo_vlan_rx_add_vid = ixgb_vlan_rx_add_vid,
361 .ndo_vlan_rx_kill_vid = ixgb_vlan_rx_kill_vid,
362 #ifdef CONFIG_NET_POLL_CONTROLLER
363 .ndo_poll_controller = ixgb_netpoll,
364 #endif
365 .ndo_set_features = ixgb_set_features,
366 };
367
368 /**
369 * ixgb_probe - Device Initialization Routine
370 * @pdev: PCI device information struct
371 * @ent: entry in ixgb_pci_tbl
372 *
373 * Returns 0 on success, negative on failure
374 *
375 * ixgb_probe initializes an adapter identified by a pci_dev structure.
376 * The OS initialization, configuring of the adapter private structure,
377 * and a hardware reset occur.
378 **/
379
380 static int __devinit
381 ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
382 {
383 struct net_device *netdev = NULL;
384 struct ixgb_adapter *adapter;
385 static int cards_found = 0;
386 int pci_using_dac;
387 int i;
388 int err;
389
390 err = pci_enable_device(pdev);
391 if (err)
392 return err;
393
394 pci_using_dac = 0;
395 err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(64));
396 if (!err) {
397 err = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64));
398 if (!err)
399 pci_using_dac = 1;
400 } else {
401 err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
402 if (err) {
403 err = dma_set_coherent_mask(&pdev->dev,
404 DMA_BIT_MASK(32));
405 if (err) {
406 pr_err("No usable DMA configuration, aborting\n");
407 goto err_dma_mask;
408 }
409 }
410 }
411
412 err = pci_request_regions(pdev, ixgb_driver_name);
413 if (err)
414 goto err_request_regions;
415
416 pci_set_master(pdev);
417
418 netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
419 if (!netdev) {
420 err = -ENOMEM;
421 goto err_alloc_etherdev;
422 }
423
424 SET_NETDEV_DEV(netdev, &pdev->dev);
425
426 pci_set_drvdata(pdev, netdev);
427 adapter = netdev_priv(netdev);
428 adapter->netdev = netdev;
429 adapter->pdev = pdev;
430 adapter->hw.back = adapter;
431 adapter->msg_enable = netif_msg_init(debug, DEFAULT_DEBUG_LEVEL_SHIFT);
432
433 adapter->hw.hw_addr = pci_ioremap_bar(pdev, BAR_0);
434 if (!adapter->hw.hw_addr) {
435 err = -EIO;
436 goto err_ioremap;
437 }
438
439 for (i = BAR_1; i <= BAR_5; i++) {
440 if (pci_resource_len(pdev, i) == 0)
441 continue;
442 if (pci_resource_flags(pdev, i) & IORESOURCE_IO) {
443 adapter->hw.io_base = pci_resource_start(pdev, i);
444 break;
445 }
446 }
447
448 netdev->netdev_ops = &ixgb_netdev_ops;
449 ixgb_set_ethtool_ops(netdev);
450 netdev->watchdog_timeo = 5 * HZ;
451 netif_napi_add(netdev, &adapter->napi, ixgb_clean, 64);
452
453 strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
454
455 adapter->bd_number = cards_found;
456 adapter->link_speed = 0;
457 adapter->link_duplex = 0;
458
459 /* setup the private structure */
460
461 err = ixgb_sw_init(adapter);
462 if (err)
463 goto err_sw_init;
464
465 netdev->hw_features = NETIF_F_SG |
466 NETIF_F_TSO |
467 NETIF_F_HW_CSUM;
468 netdev->features = netdev->hw_features |
469 NETIF_F_HW_VLAN_TX |
470 NETIF_F_HW_VLAN_RX |
471 NETIF_F_HW_VLAN_FILTER;
472 netdev->hw_features |= NETIF_F_RXCSUM;
473
474 if (pci_using_dac) {
475 netdev->features |= NETIF_F_HIGHDMA;
476 netdev->vlan_features |= NETIF_F_HIGHDMA;
477 }
478
479 /* make sure the EEPROM is good */
480
481 if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
482 netif_err(adapter, probe, adapter->netdev,
483 "The EEPROM Checksum Is Not Valid\n");
484 err = -EIO;
485 goto err_eeprom;
486 }
487
488 ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
489 memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
490
491 if (!is_valid_ether_addr(netdev->perm_addr)) {
492 netif_err(adapter, probe, adapter->netdev, "Invalid MAC Address\n");
493 err = -EIO;
494 goto err_eeprom;
495 }
496
497 adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
498
499 init_timer(&adapter->watchdog_timer);
500 adapter->watchdog_timer.function = ixgb_watchdog;
501 adapter->watchdog_timer.data = (unsigned long)adapter;
502
503 INIT_WORK(&adapter->tx_timeout_task, ixgb_tx_timeout_task);
504
505 strcpy(netdev->name, "eth%d");
506 err = register_netdev(netdev);
507 if (err)
508 goto err_register;
509
510 /* carrier off reporting is important to ethtool even BEFORE open */
511 netif_carrier_off(netdev);
512
513 netif_info(adapter, probe, adapter->netdev,
514 "Intel(R) PRO/10GbE Network Connection\n");
515 ixgb_check_options(adapter);
516 /* reset the hardware with the new settings */
517
518 ixgb_reset(adapter);
519
520 cards_found++;
521 return 0;
522
523 err_register:
524 err_sw_init:
525 err_eeprom:
526 iounmap(adapter->hw.hw_addr);
527 err_ioremap:
528 free_netdev(netdev);
529 err_alloc_etherdev:
530 pci_release_regions(pdev);
531 err_request_regions:
532 err_dma_mask:
533 pci_disable_device(pdev);
534 return err;
535 }
536
537 /**
538 * ixgb_remove - Device Removal Routine
539 * @pdev: PCI device information struct
540 *
541 * ixgb_remove is called by the PCI subsystem to alert the driver
542 * that it should release a PCI device. The could be caused by a
543 * Hot-Plug event, or because the driver is going to be removed from
544 * memory.
545 **/
546
547 static void __devexit
548 ixgb_remove(struct pci_dev *pdev)
549 {
550 struct net_device *netdev = pci_get_drvdata(pdev);
551 struct ixgb_adapter *adapter = netdev_priv(netdev);
552
553 cancel_work_sync(&adapter->tx_timeout_task);
554
555 unregister_netdev(netdev);
556
557 iounmap(adapter->hw.hw_addr);
558 pci_release_regions(pdev);
559
560 free_netdev(netdev);
561 pci_disable_device(pdev);
562 }
563
564 /**
565 * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
566 * @adapter: board private structure to initialize
567 *
568 * ixgb_sw_init initializes the Adapter private data structure.
569 * Fields are initialized based on PCI device information and
570 * OS network device settings (MTU size).
571 **/
572
573 static int __devinit
574 ixgb_sw_init(struct ixgb_adapter *adapter)
575 {
576 struct ixgb_hw *hw = &adapter->hw;
577 struct net_device *netdev = adapter->netdev;
578 struct pci_dev *pdev = adapter->pdev;
579
580 /* PCI config space info */
581
582 hw->vendor_id = pdev->vendor;
583 hw->device_id = pdev->device;
584 hw->subsystem_vendor_id = pdev->subsystem_vendor;
585 hw->subsystem_id = pdev->subsystem_device;
586
587 hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
588 adapter->rx_buffer_len = hw->max_frame_size + 8; /* + 8 for errata */
589
590 if ((hw->device_id == IXGB_DEVICE_ID_82597EX) ||
591 (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4) ||
592 (hw->device_id == IXGB_DEVICE_ID_82597EX_LR) ||
593 (hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
594 hw->mac_type = ixgb_82597;
595 else {
596 /* should never have loaded on this device */
597 netif_err(adapter, probe, adapter->netdev, "unsupported device id\n");
598 }
599
600 /* enable flow control to be programmed */
601 hw->fc.send_xon = 1;
602
603 set_bit(__IXGB_DOWN, &adapter->flags);
604 return 0;
605 }
606
607 /**
608 * ixgb_open - Called when a network interface is made active
609 * @netdev: network interface device structure
610 *
611 * Returns 0 on success, negative value on failure
612 *
613 * The open entry point is called when a network interface is made
614 * active by the system (IFF_UP). At this point all resources needed
615 * for transmit and receive operations are allocated, the interrupt
616 * handler is registered with the OS, the watchdog timer is started,
617 * and the stack is notified that the interface is ready.
618 **/
619
620 static int
621 ixgb_open(struct net_device *netdev)
622 {
623 struct ixgb_adapter *adapter = netdev_priv(netdev);
624 int err;
625
626 /* allocate transmit descriptors */
627 err = ixgb_setup_tx_resources(adapter);
628 if (err)
629 goto err_setup_tx;
630
631 netif_carrier_off(netdev);
632
633 /* allocate receive descriptors */
634
635 err = ixgb_setup_rx_resources(adapter);
636 if (err)
637 goto err_setup_rx;
638
639 err = ixgb_up(adapter);
640 if (err)
641 goto err_up;
642
643 netif_start_queue(netdev);
644
645 return 0;
646
647 err_up:
648 ixgb_free_rx_resources(adapter);
649 err_setup_rx:
650 ixgb_free_tx_resources(adapter);
651 err_setup_tx:
652 ixgb_reset(adapter);
653
654 return err;
655 }
656
657 /**
658 * ixgb_close - Disables a network interface
659 * @netdev: network interface device structure
660 *
661 * Returns 0, this is not allowed to fail
662 *
663 * The close entry point is called when an interface is de-activated
664 * by the OS. The hardware is still under the drivers control, but
665 * needs to be disabled. A global MAC reset is issued to stop the
666 * hardware, and all transmit and receive resources are freed.
667 **/
668
669 static int
670 ixgb_close(struct net_device *netdev)
671 {
672 struct ixgb_adapter *adapter = netdev_priv(netdev);
673
674 ixgb_down(adapter, true);
675
676 ixgb_free_tx_resources(adapter);
677 ixgb_free_rx_resources(adapter);
678
679 return 0;
680 }
681
682 /**
683 * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
684 * @adapter: board private structure
685 *
686 * Return 0 on success, negative on failure
687 **/
688
689 int
690 ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
691 {
692 struct ixgb_desc_ring *txdr = &adapter->tx_ring;
693 struct pci_dev *pdev = adapter->pdev;
694 int size;
695
696 size = sizeof(struct ixgb_buffer) * txdr->count;
697 txdr->buffer_info = vzalloc(size);
698 if (!txdr->buffer_info) {
699 netif_err(adapter, probe, adapter->netdev,
700 "Unable to allocate transmit descriptor ring memory\n");
701 return -ENOMEM;
702 }
703
704 /* round up to nearest 4K */
705
706 txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
707 txdr->size = ALIGN(txdr->size, 4096);
708
709 txdr->desc = dma_alloc_coherent(&pdev->dev, txdr->size, &txdr->dma,
710 GFP_KERNEL);
711 if (!txdr->desc) {
712 vfree(txdr->buffer_info);
713 netif_err(adapter, probe, adapter->netdev,
714 "Unable to allocate transmit descriptor memory\n");
715 return -ENOMEM;
716 }
717 memset(txdr->desc, 0, txdr->size);
718
719 txdr->next_to_use = 0;
720 txdr->next_to_clean = 0;
721
722 return 0;
723 }
724
725 /**
726 * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
727 * @adapter: board private structure
728 *
729 * Configure the Tx unit of the MAC after a reset.
730 **/
731
732 static void
733 ixgb_configure_tx(struct ixgb_adapter *adapter)
734 {
735 u64 tdba = adapter->tx_ring.dma;
736 u32 tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
737 u32 tctl;
738 struct ixgb_hw *hw = &adapter->hw;
739
740 /* Setup the Base and Length of the Tx Descriptor Ring
741 * tx_ring.dma can be either a 32 or 64 bit value
742 */
743
744 IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
745 IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
746
747 IXGB_WRITE_REG(hw, TDLEN, tdlen);
748
749 /* Setup the HW Tx Head and Tail descriptor pointers */
750
751 IXGB_WRITE_REG(hw, TDH, 0);
752 IXGB_WRITE_REG(hw, TDT, 0);
753
754 /* don't set up txdctl, it induces performance problems if configured
755 * incorrectly */
756 /* Set the Tx Interrupt Delay register */
757
758 IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
759
760 /* Program the Transmit Control Register */
761
762 tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
763 IXGB_WRITE_REG(hw, TCTL, tctl);
764
765 /* Setup Transmit Descriptor Settings for this adapter */
766 adapter->tx_cmd_type =
767 IXGB_TX_DESC_TYPE |
768 (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
769 }
770
771 /**
772 * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
773 * @adapter: board private structure
774 *
775 * Returns 0 on success, negative on failure
776 **/
777
778 int
779 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
780 {
781 struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
782 struct pci_dev *pdev = adapter->pdev;
783 int size;
784
785 size = sizeof(struct ixgb_buffer) * rxdr->count;
786 rxdr->buffer_info = vzalloc(size);
787 if (!rxdr->buffer_info) {
788 netif_err(adapter, probe, adapter->netdev,
789 "Unable to allocate receive descriptor ring\n");
790 return -ENOMEM;
791 }
792
793 /* Round up to nearest 4K */
794
795 rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
796 rxdr->size = ALIGN(rxdr->size, 4096);
797
798 rxdr->desc = dma_alloc_coherent(&pdev->dev, rxdr->size, &rxdr->dma,
799 GFP_KERNEL);
800
801 if (!rxdr->desc) {
802 vfree(rxdr->buffer_info);
803 netif_err(adapter, probe, adapter->netdev,
804 "Unable to allocate receive descriptors\n");
805 return -ENOMEM;
806 }
807 memset(rxdr->desc, 0, rxdr->size);
808
809 rxdr->next_to_clean = 0;
810 rxdr->next_to_use = 0;
811
812 return 0;
813 }
814
815 /**
816 * ixgb_setup_rctl - configure the receive control register
817 * @adapter: Board private structure
818 **/
819
820 static void
821 ixgb_setup_rctl(struct ixgb_adapter *adapter)
822 {
823 u32 rctl;
824
825 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
826
827 rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
828
829 rctl |=
830 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
831 IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
832 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
833
834 rctl |= IXGB_RCTL_SECRC;
835
836 if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048)
837 rctl |= IXGB_RCTL_BSIZE_2048;
838 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096)
839 rctl |= IXGB_RCTL_BSIZE_4096;
840 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192)
841 rctl |= IXGB_RCTL_BSIZE_8192;
842 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384)
843 rctl |= IXGB_RCTL_BSIZE_16384;
844
845 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
846 }
847
848 /**
849 * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
850 * @adapter: board private structure
851 *
852 * Configure the Rx unit of the MAC after a reset.
853 **/
854
855 static void
856 ixgb_configure_rx(struct ixgb_adapter *adapter)
857 {
858 u64 rdba = adapter->rx_ring.dma;
859 u32 rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
860 struct ixgb_hw *hw = &adapter->hw;
861 u32 rctl;
862 u32 rxcsum;
863
864 /* make sure receives are disabled while setting up the descriptors */
865
866 rctl = IXGB_READ_REG(hw, RCTL);
867 IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
868
869 /* set the Receive Delay Timer Register */
870
871 IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
872
873 /* Setup the Base and Length of the Rx Descriptor Ring */
874
875 IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
876 IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
877
878 IXGB_WRITE_REG(hw, RDLEN, rdlen);
879
880 /* Setup the HW Rx Head and Tail Descriptor Pointers */
881 IXGB_WRITE_REG(hw, RDH, 0);
882 IXGB_WRITE_REG(hw, RDT, 0);
883
884 /* due to the hardware errata with RXDCTL, we are unable to use any of
885 * the performance enhancing features of it without causing other
886 * subtle bugs, some of the bugs could include receive length
887 * corruption at high data rates (WTHRESH > 0) and/or receive
888 * descriptor ring irregularites (particularly in hardware cache) */
889 IXGB_WRITE_REG(hw, RXDCTL, 0);
890
891 /* Enable Receive Checksum Offload for TCP and UDP */
892 if (adapter->rx_csum) {
893 rxcsum = IXGB_READ_REG(hw, RXCSUM);
894 rxcsum |= IXGB_RXCSUM_TUOFL;
895 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
896 }
897
898 /* Enable Receives */
899
900 IXGB_WRITE_REG(hw, RCTL, rctl);
901 }
902
903 /**
904 * ixgb_free_tx_resources - Free Tx Resources
905 * @adapter: board private structure
906 *
907 * Free all transmit software resources
908 **/
909
910 void
911 ixgb_free_tx_resources(struct ixgb_adapter *adapter)
912 {
913 struct pci_dev *pdev = adapter->pdev;
914
915 ixgb_clean_tx_ring(adapter);
916
917 vfree(adapter->tx_ring.buffer_info);
918 adapter->tx_ring.buffer_info = NULL;
919
920 dma_free_coherent(&pdev->dev, adapter->tx_ring.size,
921 adapter->tx_ring.desc, adapter->tx_ring.dma);
922
923 adapter->tx_ring.desc = NULL;
924 }
925
926 static void
927 ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
928 struct ixgb_buffer *buffer_info)
929 {
930 if (buffer_info->dma) {
931 if (buffer_info->mapped_as_page)
932 dma_unmap_page(&adapter->pdev->dev, buffer_info->dma,
933 buffer_info->length, DMA_TO_DEVICE);
934 else
935 dma_unmap_single(&adapter->pdev->dev, buffer_info->dma,
936 buffer_info->length, DMA_TO_DEVICE);
937 buffer_info->dma = 0;
938 }
939
940 if (buffer_info->skb) {
941 dev_kfree_skb_any(buffer_info->skb);
942 buffer_info->skb = NULL;
943 }
944 buffer_info->time_stamp = 0;
945 /* these fields must always be initialized in tx
946 * buffer_info->length = 0;
947 * buffer_info->next_to_watch = 0; */
948 }
949
950 /**
951 * ixgb_clean_tx_ring - Free Tx Buffers
952 * @adapter: board private structure
953 **/
954
955 static void
956 ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
957 {
958 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
959 struct ixgb_buffer *buffer_info;
960 unsigned long size;
961 unsigned int i;
962
963 /* Free all the Tx ring sk_buffs */
964
965 for (i = 0; i < tx_ring->count; i++) {
966 buffer_info = &tx_ring->buffer_info[i];
967 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
968 }
969
970 size = sizeof(struct ixgb_buffer) * tx_ring->count;
971 memset(tx_ring->buffer_info, 0, size);
972
973 /* Zero out the descriptor ring */
974
975 memset(tx_ring->desc, 0, tx_ring->size);
976
977 tx_ring->next_to_use = 0;
978 tx_ring->next_to_clean = 0;
979
980 IXGB_WRITE_REG(&adapter->hw, TDH, 0);
981 IXGB_WRITE_REG(&adapter->hw, TDT, 0);
982 }
983
984 /**
985 * ixgb_free_rx_resources - Free Rx Resources
986 * @adapter: board private structure
987 *
988 * Free all receive software resources
989 **/
990
991 void
992 ixgb_free_rx_resources(struct ixgb_adapter *adapter)
993 {
994 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
995 struct pci_dev *pdev = adapter->pdev;
996
997 ixgb_clean_rx_ring(adapter);
998
999 vfree(rx_ring->buffer_info);
1000 rx_ring->buffer_info = NULL;
1001
1002 dma_free_coherent(&pdev->dev, rx_ring->size, rx_ring->desc,
1003 rx_ring->dma);
1004
1005 rx_ring->desc = NULL;
1006 }
1007
1008 /**
1009 * ixgb_clean_rx_ring - Free Rx Buffers
1010 * @adapter: board private structure
1011 **/
1012
1013 static void
1014 ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
1015 {
1016 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1017 struct ixgb_buffer *buffer_info;
1018 struct pci_dev *pdev = adapter->pdev;
1019 unsigned long size;
1020 unsigned int i;
1021
1022 /* Free all the Rx ring sk_buffs */
1023
1024 for (i = 0; i < rx_ring->count; i++) {
1025 buffer_info = &rx_ring->buffer_info[i];
1026 if (buffer_info->dma) {
1027 dma_unmap_single(&pdev->dev,
1028 buffer_info->dma,
1029 buffer_info->length,
1030 DMA_FROM_DEVICE);
1031 buffer_info->dma = 0;
1032 buffer_info->length = 0;
1033 }
1034
1035 if (buffer_info->skb) {
1036 dev_kfree_skb(buffer_info->skb);
1037 buffer_info->skb = NULL;
1038 }
1039 }
1040
1041 size = sizeof(struct ixgb_buffer) * rx_ring->count;
1042 memset(rx_ring->buffer_info, 0, size);
1043
1044 /* Zero out the descriptor ring */
1045
1046 memset(rx_ring->desc, 0, rx_ring->size);
1047
1048 rx_ring->next_to_clean = 0;
1049 rx_ring->next_to_use = 0;
1050
1051 IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1052 IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1053 }
1054
1055 /**
1056 * ixgb_set_mac - Change the Ethernet Address of the NIC
1057 * @netdev: network interface device structure
1058 * @p: pointer to an address structure
1059 *
1060 * Returns 0 on success, negative on failure
1061 **/
1062
1063 static int
1064 ixgb_set_mac(struct net_device *netdev, void *p)
1065 {
1066 struct ixgb_adapter *adapter = netdev_priv(netdev);
1067 struct sockaddr *addr = p;
1068
1069 if (!is_valid_ether_addr(addr->sa_data))
1070 return -EADDRNOTAVAIL;
1071
1072 memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1073
1074 ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1075
1076 return 0;
1077 }
1078
1079 /**
1080 * ixgb_set_multi - Multicast and Promiscuous mode set
1081 * @netdev: network interface device structure
1082 *
1083 * The set_multi entry point is called whenever the multicast address
1084 * list or the network interface flags are updated. This routine is
1085 * responsible for configuring the hardware for proper multicast,
1086 * promiscuous mode, and all-multi behavior.
1087 **/
1088
1089 static void
1090 ixgb_set_multi(struct net_device *netdev)
1091 {
1092 struct ixgb_adapter *adapter = netdev_priv(netdev);
1093 struct ixgb_hw *hw = &adapter->hw;
1094 struct netdev_hw_addr *ha;
1095 u32 rctl;
1096
1097 /* Check for Promiscuous and All Multicast modes */
1098
1099 rctl = IXGB_READ_REG(hw, RCTL);
1100
1101 if (netdev->flags & IFF_PROMISC) {
1102 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1103 /* disable VLAN filtering */
1104 rctl &= ~IXGB_RCTL_CFIEN;
1105 rctl &= ~IXGB_RCTL_VFE;
1106 } else {
1107 if (netdev->flags & IFF_ALLMULTI) {
1108 rctl |= IXGB_RCTL_MPE;
1109 rctl &= ~IXGB_RCTL_UPE;
1110 } else {
1111 rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1112 }
1113 /* enable VLAN filtering */
1114 rctl |= IXGB_RCTL_VFE;
1115 rctl &= ~IXGB_RCTL_CFIEN;
1116 }
1117
1118 if (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1119 rctl |= IXGB_RCTL_MPE;
1120 IXGB_WRITE_REG(hw, RCTL, rctl);
1121 } else {
1122 u8 *mta = kmalloc(IXGB_MAX_NUM_MULTICAST_ADDRESSES *
1123 ETH_ALEN, GFP_ATOMIC);
1124 u8 *addr;
1125 if (!mta) {
1126 pr_err("allocation of multicast memory failed\n");
1127 goto alloc_failed;
1128 }
1129
1130 IXGB_WRITE_REG(hw, RCTL, rctl);
1131
1132 addr = mta;
1133 netdev_for_each_mc_addr(ha, netdev) {
1134 memcpy(addr, ha->addr, ETH_ALEN);
1135 addr += ETH_ALEN;
1136 }
1137
1138 ixgb_mc_addr_list_update(hw, mta, netdev_mc_count(netdev), 0);
1139 kfree(mta);
1140 }
1141
1142 alloc_failed:
1143 if (netdev->features & NETIF_F_HW_VLAN_RX)
1144 ixgb_vlan_strip_enable(adapter);
1145 else
1146 ixgb_vlan_strip_disable(adapter);
1147
1148 }
1149
1150 /**
1151 * ixgb_watchdog - Timer Call-back
1152 * @data: pointer to netdev cast into an unsigned long
1153 **/
1154
1155 static void
1156 ixgb_watchdog(unsigned long data)
1157 {
1158 struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
1159 struct net_device *netdev = adapter->netdev;
1160 struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1161
1162 ixgb_check_for_link(&adapter->hw);
1163
1164 if (ixgb_check_for_bad_link(&adapter->hw)) {
1165 /* force the reset path */
1166 netif_stop_queue(netdev);
1167 }
1168
1169 if (adapter->hw.link_up) {
1170 if (!netif_carrier_ok(netdev)) {
1171 netdev_info(netdev,
1172 "NIC Link is Up 10 Gbps Full Duplex, Flow Control: %s\n",
1173 (adapter->hw.fc.type == ixgb_fc_full) ?
1174 "RX/TX" :
1175 (adapter->hw.fc.type == ixgb_fc_rx_pause) ?
1176 "RX" :
1177 (adapter->hw.fc.type == ixgb_fc_tx_pause) ?
1178 "TX" : "None");
1179 adapter->link_speed = 10000;
1180 adapter->link_duplex = FULL_DUPLEX;
1181 netif_carrier_on(netdev);
1182 }
1183 } else {
1184 if (netif_carrier_ok(netdev)) {
1185 adapter->link_speed = 0;
1186 adapter->link_duplex = 0;
1187 netdev_info(netdev, "NIC Link is Down\n");
1188 netif_carrier_off(netdev);
1189 }
1190 }
1191
1192 ixgb_update_stats(adapter);
1193
1194 if (!netif_carrier_ok(netdev)) {
1195 if (IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1196 /* We've lost link, so the controller stops DMA,
1197 * but we've got queued Tx work that's never going
1198 * to get done, so reset controller to flush Tx.
1199 * (Do the reset outside of interrupt context). */
1200 schedule_work(&adapter->tx_timeout_task);
1201 /* return immediately since reset is imminent */
1202 return;
1203 }
1204 }
1205
1206 /* Force detection of hung controller every watchdog period */
1207 adapter->detect_tx_hung = true;
1208
1209 /* generate an interrupt to force clean up of any stragglers */
1210 IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1211
1212 /* Reset the timer */
1213 mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1214 }
1215
1216 #define IXGB_TX_FLAGS_CSUM 0x00000001
1217 #define IXGB_TX_FLAGS_VLAN 0x00000002
1218 #define IXGB_TX_FLAGS_TSO 0x00000004
1219
1220 static int
1221 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1222 {
1223 struct ixgb_context_desc *context_desc;
1224 unsigned int i;
1225 u8 ipcss, ipcso, tucss, tucso, hdr_len;
1226 u16 ipcse, tucse, mss;
1227 int err;
1228
1229 if (likely(skb_is_gso(skb))) {
1230 struct ixgb_buffer *buffer_info;
1231 struct iphdr *iph;
1232
1233 if (skb_header_cloned(skb)) {
1234 err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1235 if (err)
1236 return err;
1237 }
1238
1239 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
1240 mss = skb_shinfo(skb)->gso_size;
1241 iph = ip_hdr(skb);
1242 iph->tot_len = 0;
1243 iph->check = 0;
1244 tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
1245 iph->daddr, 0,
1246 IPPROTO_TCP, 0);
1247 ipcss = skb_network_offset(skb);
1248 ipcso = (void *)&(iph->check) - (void *)skb->data;
1249 ipcse = skb_transport_offset(skb) - 1;
1250 tucss = skb_transport_offset(skb);
1251 tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data;
1252 tucse = 0;
1253
1254 i = adapter->tx_ring.next_to_use;
1255 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1256 buffer_info = &adapter->tx_ring.buffer_info[i];
1257 WARN_ON(buffer_info->dma != 0);
1258
1259 context_desc->ipcss = ipcss;
1260 context_desc->ipcso = ipcso;
1261 context_desc->ipcse = cpu_to_le16(ipcse);
1262 context_desc->tucss = tucss;
1263 context_desc->tucso = tucso;
1264 context_desc->tucse = cpu_to_le16(tucse);
1265 context_desc->mss = cpu_to_le16(mss);
1266 context_desc->hdr_len = hdr_len;
1267 context_desc->status = 0;
1268 context_desc->cmd_type_len = cpu_to_le32(
1269 IXGB_CONTEXT_DESC_TYPE
1270 | IXGB_CONTEXT_DESC_CMD_TSE
1271 | IXGB_CONTEXT_DESC_CMD_IP
1272 | IXGB_CONTEXT_DESC_CMD_TCP
1273 | IXGB_CONTEXT_DESC_CMD_IDE
1274 | (skb->len - (hdr_len)));
1275
1276
1277 if (++i == adapter->tx_ring.count) i = 0;
1278 adapter->tx_ring.next_to_use = i;
1279
1280 return 1;
1281 }
1282
1283 return 0;
1284 }
1285
1286 static bool
1287 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1288 {
1289 struct ixgb_context_desc *context_desc;
1290 unsigned int i;
1291 u8 css, cso;
1292
1293 if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
1294 struct ixgb_buffer *buffer_info;
1295 css = skb_checksum_start_offset(skb);
1296 cso = css + skb->csum_offset;
1297
1298 i = adapter->tx_ring.next_to_use;
1299 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1300 buffer_info = &adapter->tx_ring.buffer_info[i];
1301 WARN_ON(buffer_info->dma != 0);
1302
1303 context_desc->tucss = css;
1304 context_desc->tucso = cso;
1305 context_desc->tucse = 0;
1306 /* zero out any previously existing data in one instruction */
1307 *(u32 *)&(context_desc->ipcss) = 0;
1308 context_desc->status = 0;
1309 context_desc->hdr_len = 0;
1310 context_desc->mss = 0;
1311 context_desc->cmd_type_len =
1312 cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1313 | IXGB_TX_DESC_CMD_IDE);
1314
1315 if (++i == adapter->tx_ring.count) i = 0;
1316 adapter->tx_ring.next_to_use = i;
1317
1318 return true;
1319 }
1320
1321 return false;
1322 }
1323
1324 #define IXGB_MAX_TXD_PWR 14
1325 #define IXGB_MAX_DATA_PER_TXD (1<<IXGB_MAX_TXD_PWR)
1326
1327 static int
1328 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1329 unsigned int first)
1330 {
1331 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1332 struct pci_dev *pdev = adapter->pdev;
1333 struct ixgb_buffer *buffer_info;
1334 int len = skb_headlen(skb);
1335 unsigned int offset = 0, size, count = 0, i;
1336 unsigned int mss = skb_shinfo(skb)->gso_size;
1337 unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1338 unsigned int f;
1339
1340 i = tx_ring->next_to_use;
1341
1342 while (len) {
1343 buffer_info = &tx_ring->buffer_info[i];
1344 size = min(len, IXGB_MAX_DATA_PER_TXD);
1345 /* Workaround for premature desc write-backs
1346 * in TSO mode. Append 4-byte sentinel desc */
1347 if (unlikely(mss && !nr_frags && size == len && size > 8))
1348 size -= 4;
1349
1350 buffer_info->length = size;
1351 WARN_ON(buffer_info->dma != 0);
1352 buffer_info->time_stamp = jiffies;
1353 buffer_info->mapped_as_page = false;
1354 buffer_info->dma = dma_map_single(&pdev->dev,
1355 skb->data + offset,
1356 size, DMA_TO_DEVICE);
1357 if (dma_mapping_error(&pdev->dev, buffer_info->dma))
1358 goto dma_error;
1359 buffer_info->next_to_watch = 0;
1360
1361 len -= size;
1362 offset += size;
1363 count++;
1364 if (len) {
1365 i++;
1366 if (i == tx_ring->count)
1367 i = 0;
1368 }
1369 }
1370
1371 for (f = 0; f < nr_frags; f++) {
1372 struct skb_frag_struct *frag;
1373
1374 frag = &skb_shinfo(skb)->frags[f];
1375 len = frag->size;
1376 offset = 0;
1377
1378 while (len) {
1379 i++;
1380 if (i == tx_ring->count)
1381 i = 0;
1382
1383 buffer_info = &tx_ring->buffer_info[i];
1384 size = min(len, IXGB_MAX_DATA_PER_TXD);
1385
1386 /* Workaround for premature desc write-backs
1387 * in TSO mode. Append 4-byte sentinel desc */
1388 if (unlikely(mss && (f == (nr_frags - 1))
1389 && size == len && size > 8))
1390 size -= 4;
1391
1392 buffer_info->length = size;
1393 buffer_info->time_stamp = jiffies;
1394 buffer_info->mapped_as_page = true;
1395 buffer_info->dma =
1396 skb_frag_dma_map(&pdev->dev, frag, offset, size,
1397 DMA_TO_DEVICE);
1398 if (dma_mapping_error(&pdev->dev, buffer_info->dma))
1399 goto dma_error;
1400 buffer_info->next_to_watch = 0;
1401
1402 len -= size;
1403 offset += size;
1404 count++;
1405 }
1406 }
1407 tx_ring->buffer_info[i].skb = skb;
1408 tx_ring->buffer_info[first].next_to_watch = i;
1409
1410 return count;
1411
1412 dma_error:
1413 dev_err(&pdev->dev, "TX DMA map failed\n");
1414 buffer_info->dma = 0;
1415 if (count)
1416 count--;
1417
1418 while (count--) {
1419 if (i==0)
1420 i += tx_ring->count;
1421 i--;
1422 buffer_info = &tx_ring->buffer_info[i];
1423 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1424 }
1425
1426 return 0;
1427 }
1428
1429 static void
1430 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1431 {
1432 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1433 struct ixgb_tx_desc *tx_desc = NULL;
1434 struct ixgb_buffer *buffer_info;
1435 u32 cmd_type_len = adapter->tx_cmd_type;
1436 u8 status = 0;
1437 u8 popts = 0;
1438 unsigned int i;
1439
1440 if (tx_flags & IXGB_TX_FLAGS_TSO) {
1441 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1442 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1443 }
1444
1445 if (tx_flags & IXGB_TX_FLAGS_CSUM)
1446 popts |= IXGB_TX_DESC_POPTS_TXSM;
1447
1448 if (tx_flags & IXGB_TX_FLAGS_VLAN)
1449 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1450
1451 i = tx_ring->next_to_use;
1452
1453 while (count--) {
1454 buffer_info = &tx_ring->buffer_info[i];
1455 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1456 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1457 tx_desc->cmd_type_len =
1458 cpu_to_le32(cmd_type_len | buffer_info->length);
1459 tx_desc->status = status;
1460 tx_desc->popts = popts;
1461 tx_desc->vlan = cpu_to_le16(vlan_id);
1462
1463 if (++i == tx_ring->count) i = 0;
1464 }
1465
1466 tx_desc->cmd_type_len |=
1467 cpu_to_le32(IXGB_TX_DESC_CMD_EOP | IXGB_TX_DESC_CMD_RS);
1468
1469 /* Force memory writes to complete before letting h/w
1470 * know there are new descriptors to fetch. (Only
1471 * applicable for weak-ordered memory model archs,
1472 * such as IA-64). */
1473 wmb();
1474
1475 tx_ring->next_to_use = i;
1476 IXGB_WRITE_REG(&adapter->hw, TDT, i);
1477 }
1478
1479 static int __ixgb_maybe_stop_tx(struct net_device *netdev, int size)
1480 {
1481 struct ixgb_adapter *adapter = netdev_priv(netdev);
1482 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1483
1484 netif_stop_queue(netdev);
1485 /* Herbert's original patch had:
1486 * smp_mb__after_netif_stop_queue();
1487 * but since that doesn't exist yet, just open code it. */
1488 smp_mb();
1489
1490 /* We need to check again in a case another CPU has just
1491 * made room available. */
1492 if (likely(IXGB_DESC_UNUSED(tx_ring) < size))
1493 return -EBUSY;
1494
1495 /* A reprieve! */
1496 netif_start_queue(netdev);
1497 ++adapter->restart_queue;
1498 return 0;
1499 }
1500
1501 static int ixgb_maybe_stop_tx(struct net_device *netdev,
1502 struct ixgb_desc_ring *tx_ring, int size)
1503 {
1504 if (likely(IXGB_DESC_UNUSED(tx_ring) >= size))
1505 return 0;
1506 return __ixgb_maybe_stop_tx(netdev, size);
1507 }
1508
1509
1510 /* Tx Descriptors needed, worst case */
1511 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1512 (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1513 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) /* skb->date */ + \
1514 MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 /* for context */ \
1515 + 1 /* one more needed for sentinel TSO workaround */
1516
1517 static netdev_tx_t
1518 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1519 {
1520 struct ixgb_adapter *adapter = netdev_priv(netdev);
1521 unsigned int first;
1522 unsigned int tx_flags = 0;
1523 int vlan_id = 0;
1524 int count = 0;
1525 int tso;
1526
1527 if (test_bit(__IXGB_DOWN, &adapter->flags)) {
1528 dev_kfree_skb(skb);
1529 return NETDEV_TX_OK;
1530 }
1531
1532 if (skb->len <= 0) {
1533 dev_kfree_skb(skb);
1534 return NETDEV_TX_OK;
1535 }
1536
1537 if (unlikely(ixgb_maybe_stop_tx(netdev, &adapter->tx_ring,
1538 DESC_NEEDED)))
1539 return NETDEV_TX_BUSY;
1540
1541 if (vlan_tx_tag_present(skb)) {
1542 tx_flags |= IXGB_TX_FLAGS_VLAN;
1543 vlan_id = vlan_tx_tag_get(skb);
1544 }
1545
1546 first = adapter->tx_ring.next_to_use;
1547
1548 tso = ixgb_tso(adapter, skb);
1549 if (tso < 0) {
1550 dev_kfree_skb(skb);
1551 return NETDEV_TX_OK;
1552 }
1553
1554 if (likely(tso))
1555 tx_flags |= IXGB_TX_FLAGS_TSO;
1556 else if (ixgb_tx_csum(adapter, skb))
1557 tx_flags |= IXGB_TX_FLAGS_CSUM;
1558
1559 count = ixgb_tx_map(adapter, skb, first);
1560
1561 if (count) {
1562 ixgb_tx_queue(adapter, count, vlan_id, tx_flags);
1563 /* Make sure there is space in the ring for the next send. */
1564 ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED);
1565
1566 } else {
1567 dev_kfree_skb_any(skb);
1568 adapter->tx_ring.buffer_info[first].time_stamp = 0;
1569 adapter->tx_ring.next_to_use = first;
1570 }
1571
1572 return NETDEV_TX_OK;
1573 }
1574
1575 /**
1576 * ixgb_tx_timeout - Respond to a Tx Hang
1577 * @netdev: network interface device structure
1578 **/
1579
1580 static void
1581 ixgb_tx_timeout(struct net_device *netdev)
1582 {
1583 struct ixgb_adapter *adapter = netdev_priv(netdev);
1584
1585 /* Do the reset outside of interrupt context */
1586 schedule_work(&adapter->tx_timeout_task);
1587 }
1588
1589 static void
1590 ixgb_tx_timeout_task(struct work_struct *work)
1591 {
1592 struct ixgb_adapter *adapter =
1593 container_of(work, struct ixgb_adapter, tx_timeout_task);
1594
1595 adapter->tx_timeout_count++;
1596 ixgb_down(adapter, true);
1597 ixgb_up(adapter);
1598 }
1599
1600 /**
1601 * ixgb_get_stats - Get System Network Statistics
1602 * @netdev: network interface device structure
1603 *
1604 * Returns the address of the device statistics structure.
1605 * The statistics are actually updated from the timer callback.
1606 **/
1607
1608 static struct net_device_stats *
1609 ixgb_get_stats(struct net_device *netdev)
1610 {
1611 return &netdev->stats;
1612 }
1613
1614 /**
1615 * ixgb_change_mtu - Change the Maximum Transfer Unit
1616 * @netdev: network interface device structure
1617 * @new_mtu: new value for maximum frame size
1618 *
1619 * Returns 0 on success, negative on failure
1620 **/
1621
1622 static int
1623 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1624 {
1625 struct ixgb_adapter *adapter = netdev_priv(netdev);
1626 int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1627 int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1628
1629 /* MTU < 68 is an error for IPv4 traffic, just don't allow it */
1630 if ((new_mtu < 68) ||
1631 (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
1632 netif_err(adapter, probe, adapter->netdev,
1633 "Invalid MTU setting %d\n", new_mtu);
1634 return -EINVAL;
1635 }
1636
1637 if (old_max_frame == max_frame)
1638 return 0;
1639
1640 if (netif_running(netdev))
1641 ixgb_down(adapter, true);
1642
1643 adapter->rx_buffer_len = max_frame + 8; /* + 8 for errata */
1644
1645 netdev->mtu = new_mtu;
1646
1647 if (netif_running(netdev))
1648 ixgb_up(adapter);
1649
1650 return 0;
1651 }
1652
1653 /**
1654 * ixgb_update_stats - Update the board statistics counters.
1655 * @adapter: board private structure
1656 **/
1657
1658 void
1659 ixgb_update_stats(struct ixgb_adapter *adapter)
1660 {
1661 struct net_device *netdev = adapter->netdev;
1662 struct pci_dev *pdev = adapter->pdev;
1663
1664 /* Prevent stats update while adapter is being reset */
1665 if (pci_channel_offline(pdev))
1666 return;
1667
1668 if ((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1669 (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1670 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1671 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1672 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1673 u64 bcast = ((u64)bcast_h << 32) | bcast_l;
1674
1675 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1676 /* fix up multicast stats by removing broadcasts */
1677 if (multi >= bcast)
1678 multi -= bcast;
1679
1680 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1681 adapter->stats.mprch += (multi >> 32);
1682 adapter->stats.bprcl += bcast_l;
1683 adapter->stats.bprch += bcast_h;
1684 } else {
1685 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1686 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1687 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1688 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1689 }
1690 adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1691 adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1692 adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1693 adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1694 adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1695 adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1696 adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1697 adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1698 adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1699 adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1700 adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1701 adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1702 adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1703 adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1704 adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1705 adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1706 adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1707 adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1708 adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1709 adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1710 adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1711 adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1712 adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1713 adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1714 adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1715 adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1716 adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1717 adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1718 adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1719 adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1720 adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1721 adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1722 adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1723 adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1724 adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1725 adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1726 adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1727 adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1728 adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1729 adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1730 adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1731 adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1732 adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1733 adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1734 adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1735 adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1736 adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1737 adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1738 adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1739 adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1740 adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1741 adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1742 adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1743 adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1744 adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1745 adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1746
1747 /* Fill out the OS statistics structure */
1748
1749 netdev->stats.rx_packets = adapter->stats.gprcl;
1750 netdev->stats.tx_packets = adapter->stats.gptcl;
1751 netdev->stats.rx_bytes = adapter->stats.gorcl;
1752 netdev->stats.tx_bytes = adapter->stats.gotcl;
1753 netdev->stats.multicast = adapter->stats.mprcl;
1754 netdev->stats.collisions = 0;
1755
1756 /* ignore RLEC as it reports errors for padded (<64bytes) frames
1757 * with a length in the type/len field */
1758 netdev->stats.rx_errors =
1759 /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1760 adapter->stats.ruc +
1761 adapter->stats.roc /*+ adapter->stats.rlec */ +
1762 adapter->stats.icbc +
1763 adapter->stats.ecbc + adapter->stats.mpc;
1764
1765 /* see above
1766 * netdev->stats.rx_length_errors = adapter->stats.rlec;
1767 */
1768
1769 netdev->stats.rx_crc_errors = adapter->stats.crcerrs;
1770 netdev->stats.rx_fifo_errors = adapter->stats.mpc;
1771 netdev->stats.rx_missed_errors = adapter->stats.mpc;
1772 netdev->stats.rx_over_errors = adapter->stats.mpc;
1773
1774 netdev->stats.tx_errors = 0;
1775 netdev->stats.rx_frame_errors = 0;
1776 netdev->stats.tx_aborted_errors = 0;
1777 netdev->stats.tx_carrier_errors = 0;
1778 netdev->stats.tx_fifo_errors = 0;
1779 netdev->stats.tx_heartbeat_errors = 0;
1780 netdev->stats.tx_window_errors = 0;
1781 }
1782
1783 #define IXGB_MAX_INTR 10
1784 /**
1785 * ixgb_intr - Interrupt Handler
1786 * @irq: interrupt number
1787 * @data: pointer to a network interface device structure
1788 **/
1789
1790 static irqreturn_t
1791 ixgb_intr(int irq, void *data)
1792 {
1793 struct net_device *netdev = data;
1794 struct ixgb_adapter *adapter = netdev_priv(netdev);
1795 struct ixgb_hw *hw = &adapter->hw;
1796 u32 icr = IXGB_READ_REG(hw, ICR);
1797
1798 if (unlikely(!icr))
1799 return IRQ_NONE; /* Not our interrupt */
1800
1801 if (unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC)))
1802 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1803 mod_timer(&adapter->watchdog_timer, jiffies);
1804
1805 if (napi_schedule_prep(&adapter->napi)) {
1806
1807 /* Disable interrupts and register for poll. The flush
1808 of the posted write is intentionally left out.
1809 */
1810
1811 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1812 __napi_schedule(&adapter->napi);
1813 }
1814 return IRQ_HANDLED;
1815 }
1816
1817 /**
1818 * ixgb_clean - NAPI Rx polling callback
1819 * @adapter: board private structure
1820 **/
1821
1822 static int
1823 ixgb_clean(struct napi_struct *napi, int budget)
1824 {
1825 struct ixgb_adapter *adapter = container_of(napi, struct ixgb_adapter, napi);
1826 int work_done = 0;
1827
1828 ixgb_clean_tx_irq(adapter);
1829 ixgb_clean_rx_irq(adapter, &work_done, budget);
1830
1831 /* If budget not fully consumed, exit the polling mode */
1832 if (work_done < budget) {
1833 napi_complete(napi);
1834 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1835 ixgb_irq_enable(adapter);
1836 }
1837
1838 return work_done;
1839 }
1840
1841 /**
1842 * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1843 * @adapter: board private structure
1844 **/
1845
1846 static bool
1847 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1848 {
1849 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1850 struct net_device *netdev = adapter->netdev;
1851 struct ixgb_tx_desc *tx_desc, *eop_desc;
1852 struct ixgb_buffer *buffer_info;
1853 unsigned int i, eop;
1854 bool cleaned = false;
1855
1856 i = tx_ring->next_to_clean;
1857 eop = tx_ring->buffer_info[i].next_to_watch;
1858 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1859
1860 while (eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1861
1862 rmb(); /* read buffer_info after eop_desc */
1863 for (cleaned = false; !cleaned; ) {
1864 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1865 buffer_info = &tx_ring->buffer_info[i];
1866
1867 if (tx_desc->popts &
1868 (IXGB_TX_DESC_POPTS_TXSM |
1869 IXGB_TX_DESC_POPTS_IXSM))
1870 adapter->hw_csum_tx_good++;
1871
1872 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1873
1874 *(u32 *)&(tx_desc->status) = 0;
1875
1876 cleaned = (i == eop);
1877 if (++i == tx_ring->count) i = 0;
1878 }
1879
1880 eop = tx_ring->buffer_info[i].next_to_watch;
1881 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1882 }
1883
1884 tx_ring->next_to_clean = i;
1885
1886 if (unlikely(cleaned && netif_carrier_ok(netdev) &&
1887 IXGB_DESC_UNUSED(tx_ring) >= DESC_NEEDED)) {
1888 /* Make sure that anybody stopping the queue after this
1889 * sees the new next_to_clean. */
1890 smp_mb();
1891
1892 if (netif_queue_stopped(netdev) &&
1893 !(test_bit(__IXGB_DOWN, &adapter->flags))) {
1894 netif_wake_queue(netdev);
1895 ++adapter->restart_queue;
1896 }
1897 }
1898
1899 if (adapter->detect_tx_hung) {
1900 /* detect a transmit hang in hardware, this serializes the
1901 * check with the clearing of time_stamp and movement of i */
1902 adapter->detect_tx_hung = false;
1903 if (tx_ring->buffer_info[eop].time_stamp &&
1904 time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ)
1905 && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1906 IXGB_STATUS_TXOFF)) {
1907 /* detected Tx unit hang */
1908 netif_err(adapter, drv, adapter->netdev,
1909 "Detected Tx Unit Hang\n"
1910 " TDH <%x>\n"
1911 " TDT <%x>\n"
1912 " next_to_use <%x>\n"
1913 " next_to_clean <%x>\n"
1914 "buffer_info[next_to_clean]\n"
1915 " time_stamp <%lx>\n"
1916 " next_to_watch <%x>\n"
1917 " jiffies <%lx>\n"
1918 " next_to_watch.status <%x>\n",
1919 IXGB_READ_REG(&adapter->hw, TDH),
1920 IXGB_READ_REG(&adapter->hw, TDT),
1921 tx_ring->next_to_use,
1922 tx_ring->next_to_clean,
1923 tx_ring->buffer_info[eop].time_stamp,
1924 eop,
1925 jiffies,
1926 eop_desc->status);
1927 netif_stop_queue(netdev);
1928 }
1929 }
1930
1931 return cleaned;
1932 }
1933
1934 /**
1935 * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1936 * @adapter: board private structure
1937 * @rx_desc: receive descriptor
1938 * @sk_buff: socket buffer with received data
1939 **/
1940
1941 static void
1942 ixgb_rx_checksum(struct ixgb_adapter *adapter,
1943 struct ixgb_rx_desc *rx_desc,
1944 struct sk_buff *skb)
1945 {
1946 /* Ignore Checksum bit is set OR
1947 * TCP Checksum has not been calculated
1948 */
1949 if ((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1950 (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1951 skb_checksum_none_assert(skb);
1952 return;
1953 }
1954
1955 /* At this point we know the hardware did the TCP checksum */
1956 /* now look at the TCP checksum error bit */
1957 if (rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1958 /* let the stack verify checksum errors */
1959 skb_checksum_none_assert(skb);
1960 adapter->hw_csum_rx_error++;
1961 } else {
1962 /* TCP checksum is good */
1963 skb->ip_summed = CHECKSUM_UNNECESSARY;
1964 adapter->hw_csum_rx_good++;
1965 }
1966 }
1967
1968 /*
1969 * this should improve performance for small packets with large amounts
1970 * of reassembly being done in the stack
1971 */
1972 static void ixgb_check_copybreak(struct net_device *netdev,
1973 struct ixgb_buffer *buffer_info,
1974 u32 length, struct sk_buff **skb)
1975 {
1976 struct sk_buff *new_skb;
1977
1978 if (length > copybreak)
1979 return;
1980
1981 new_skb = netdev_alloc_skb_ip_align(netdev, length);
1982 if (!new_skb)
1983 return;
1984
1985 skb_copy_to_linear_data_offset(new_skb, -NET_IP_ALIGN,
1986 (*skb)->data - NET_IP_ALIGN,
1987 length + NET_IP_ALIGN);
1988 /* save the skb in buffer_info as good */
1989 buffer_info->skb = *skb;
1990 *skb = new_skb;
1991 }
1992
1993 /**
1994 * ixgb_clean_rx_irq - Send received data up the network stack,
1995 * @adapter: board private structure
1996 **/
1997
1998 static bool
1999 ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
2000 {
2001 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2002 struct net_device *netdev = adapter->netdev;
2003 struct pci_dev *pdev = adapter->pdev;
2004 struct ixgb_rx_desc *rx_desc, *next_rxd;
2005 struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
2006 u32 length;
2007 unsigned int i, j;
2008 int cleaned_count = 0;
2009 bool cleaned = false;
2010
2011 i = rx_ring->next_to_clean;
2012 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2013 buffer_info = &rx_ring->buffer_info[i];
2014
2015 while (rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
2016 struct sk_buff *skb;
2017 u8 status;
2018
2019 if (*work_done >= work_to_do)
2020 break;
2021
2022 (*work_done)++;
2023 rmb(); /* read descriptor and rx_buffer_info after status DD */
2024 status = rx_desc->status;
2025 skb = buffer_info->skb;
2026 buffer_info->skb = NULL;
2027
2028 prefetch(skb->data - NET_IP_ALIGN);
2029
2030 if (++i == rx_ring->count)
2031 i = 0;
2032 next_rxd = IXGB_RX_DESC(*rx_ring, i);
2033 prefetch(next_rxd);
2034
2035 j = i + 1;
2036 if (j == rx_ring->count)
2037 j = 0;
2038 next2_buffer = &rx_ring->buffer_info[j];
2039 prefetch(next2_buffer);
2040
2041 next_buffer = &rx_ring->buffer_info[i];
2042
2043 cleaned = true;
2044 cleaned_count++;
2045
2046 dma_unmap_single(&pdev->dev,
2047 buffer_info->dma,
2048 buffer_info->length,
2049 DMA_FROM_DEVICE);
2050 buffer_info->dma = 0;
2051
2052 length = le16_to_cpu(rx_desc->length);
2053 rx_desc->length = 0;
2054
2055 if (unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
2056
2057 /* All receives must fit into a single buffer */
2058
2059 IXGB_DBG("Receive packet consumed multiple buffers "
2060 "length<%x>\n", length);
2061
2062 dev_kfree_skb_irq(skb);
2063 goto rxdesc_done;
2064 }
2065
2066 if (unlikely(rx_desc->errors &
2067 (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE |
2068 IXGB_RX_DESC_ERRORS_P | IXGB_RX_DESC_ERRORS_RXE))) {
2069 dev_kfree_skb_irq(skb);
2070 goto rxdesc_done;
2071 }
2072
2073 ixgb_check_copybreak(netdev, buffer_info, length, &skb);
2074
2075 /* Good Receive */
2076 skb_put(skb, length);
2077
2078 /* Receive Checksum Offload */
2079 ixgb_rx_checksum(adapter, rx_desc, skb);
2080
2081 skb->protocol = eth_type_trans(skb, netdev);
2082 if (status & IXGB_RX_DESC_STATUS_VP)
2083 __vlan_hwaccel_put_tag(skb,
2084 le16_to_cpu(rx_desc->special));
2085
2086 netif_receive_skb(skb);
2087
2088 rxdesc_done:
2089 /* clean up descriptor, might be written over by hw */
2090 rx_desc->status = 0;
2091
2092 /* return some buffers to hardware, one at a time is too slow */
2093 if (unlikely(cleaned_count >= IXGB_RX_BUFFER_WRITE)) {
2094 ixgb_alloc_rx_buffers(adapter, cleaned_count);
2095 cleaned_count = 0;
2096 }
2097
2098 /* use prefetched values */
2099 rx_desc = next_rxd;
2100 buffer_info = next_buffer;
2101 }
2102
2103 rx_ring->next_to_clean = i;
2104
2105 cleaned_count = IXGB_DESC_UNUSED(rx_ring);
2106 if (cleaned_count)
2107 ixgb_alloc_rx_buffers(adapter, cleaned_count);
2108
2109 return cleaned;
2110 }
2111
2112 /**
2113 * ixgb_alloc_rx_buffers - Replace used receive buffers
2114 * @adapter: address of board private structure
2115 **/
2116
2117 static void
2118 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter, int cleaned_count)
2119 {
2120 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2121 struct net_device *netdev = adapter->netdev;
2122 struct pci_dev *pdev = adapter->pdev;
2123 struct ixgb_rx_desc *rx_desc;
2124 struct ixgb_buffer *buffer_info;
2125 struct sk_buff *skb;
2126 unsigned int i;
2127 long cleancount;
2128
2129 i = rx_ring->next_to_use;
2130 buffer_info = &rx_ring->buffer_info[i];
2131 cleancount = IXGB_DESC_UNUSED(rx_ring);
2132
2133
2134 /* leave three descriptors unused */
2135 while (--cleancount > 2 && cleaned_count--) {
2136 /* recycle! its good for you */
2137 skb = buffer_info->skb;
2138 if (skb) {
2139 skb_trim(skb, 0);
2140 goto map_skb;
2141 }
2142
2143 skb = netdev_alloc_skb_ip_align(netdev, adapter->rx_buffer_len);
2144 if (unlikely(!skb)) {
2145 /* Better luck next round */
2146 adapter->alloc_rx_buff_failed++;
2147 break;
2148 }
2149
2150 buffer_info->skb = skb;
2151 buffer_info->length = adapter->rx_buffer_len;
2152 map_skb:
2153 buffer_info->dma = dma_map_single(&pdev->dev,
2154 skb->data,
2155 adapter->rx_buffer_len,
2156 DMA_FROM_DEVICE);
2157
2158 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2159 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
2160 /* guarantee DD bit not set now before h/w gets descriptor
2161 * this is the rest of the workaround for h/w double
2162 * writeback. */
2163 rx_desc->status = 0;
2164
2165
2166 if (++i == rx_ring->count) i = 0;
2167 buffer_info = &rx_ring->buffer_info[i];
2168 }
2169
2170 if (likely(rx_ring->next_to_use != i)) {
2171 rx_ring->next_to_use = i;
2172 if (unlikely(i-- == 0))
2173 i = (rx_ring->count - 1);
2174
2175 /* Force memory writes to complete before letting h/w
2176 * know there are new descriptors to fetch. (Only
2177 * applicable for weak-ordered memory model archs, such
2178 * as IA-64). */
2179 wmb();
2180 IXGB_WRITE_REG(&adapter->hw, RDT, i);
2181 }
2182 }
2183
2184 static void
2185 ixgb_vlan_strip_enable(struct ixgb_adapter *adapter)
2186 {
2187 u32 ctrl;
2188
2189 /* enable VLAN tag insert/strip */
2190 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2191 ctrl |= IXGB_CTRL0_VME;
2192 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2193 }
2194
2195 static void
2196 ixgb_vlan_strip_disable(struct ixgb_adapter *adapter)
2197 {
2198 u32 ctrl;
2199
2200 /* disable VLAN tag insert/strip */
2201 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2202 ctrl &= ~IXGB_CTRL0_VME;
2203 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2204 }
2205
2206 static void
2207 ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid)
2208 {
2209 struct ixgb_adapter *adapter = netdev_priv(netdev);
2210 u32 vfta, index;
2211
2212 /* add VID to filter table */
2213
2214 index = (vid >> 5) & 0x7F;
2215 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2216 vfta |= (1 << (vid & 0x1F));
2217 ixgb_write_vfta(&adapter->hw, index, vfta);
2218 set_bit(vid, adapter->active_vlans);
2219 }
2220
2221 static void
2222 ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid)
2223 {
2224 struct ixgb_adapter *adapter = netdev_priv(netdev);
2225 u32 vfta, index;
2226
2227 /* remove VID from filter table */
2228
2229 index = (vid >> 5) & 0x7F;
2230 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2231 vfta &= ~(1 << (vid & 0x1F));
2232 ixgb_write_vfta(&adapter->hw, index, vfta);
2233 clear_bit(vid, adapter->active_vlans);
2234 }
2235
2236 static void
2237 ixgb_restore_vlan(struct ixgb_adapter *adapter)
2238 {
2239 u16 vid;
2240
2241 for_each_set_bit(vid, adapter->active_vlans, VLAN_N_VID)
2242 ixgb_vlan_rx_add_vid(adapter->netdev, vid);
2243 }
2244
2245 #ifdef CONFIG_NET_POLL_CONTROLLER
2246 /*
2247 * Polling 'interrupt' - used by things like netconsole to send skbs
2248 * without having to re-enable interrupts. It's not called while
2249 * the interrupt routine is executing.
2250 */
2251
2252 static void ixgb_netpoll(struct net_device *dev)
2253 {
2254 struct ixgb_adapter *adapter = netdev_priv(dev);
2255
2256 disable_irq(adapter->pdev->irq);
2257 ixgb_intr(adapter->pdev->irq, dev);
2258 enable_irq(adapter->pdev->irq);
2259 }
2260 #endif
2261
2262 /**
2263 * ixgb_io_error_detected() - called when PCI error is detected
2264 * @pdev pointer to pci device with error
2265 * @state pci channel state after error
2266 *
2267 * This callback is called by the PCI subsystem whenever
2268 * a PCI bus error is detected.
2269 */
2270 static pci_ers_result_t ixgb_io_error_detected(struct pci_dev *pdev,
2271 enum pci_channel_state state)
2272 {
2273 struct net_device *netdev = pci_get_drvdata(pdev);
2274 struct ixgb_adapter *adapter = netdev_priv(netdev);
2275
2276 netif_device_detach(netdev);
2277
2278 if (state == pci_channel_io_perm_failure)
2279 return PCI_ERS_RESULT_DISCONNECT;
2280
2281 if (netif_running(netdev))
2282 ixgb_down(adapter, true);
2283
2284 pci_disable_device(pdev);
2285
2286 /* Request a slot reset. */
2287 return PCI_ERS_RESULT_NEED_RESET;
2288 }
2289
2290 /**
2291 * ixgb_io_slot_reset - called after the pci bus has been reset.
2292 * @pdev pointer to pci device with error
2293 *
2294 * This callback is called after the PCI bus has been reset.
2295 * Basically, this tries to restart the card from scratch.
2296 * This is a shortened version of the device probe/discovery code,
2297 * it resembles the first-half of the ixgb_probe() routine.
2298 */
2299 static pci_ers_result_t ixgb_io_slot_reset(struct pci_dev *pdev)
2300 {
2301 struct net_device *netdev = pci_get_drvdata(pdev);
2302 struct ixgb_adapter *adapter = netdev_priv(netdev);
2303
2304 if (pci_enable_device(pdev)) {
2305 netif_err(adapter, probe, adapter->netdev,
2306 "Cannot re-enable PCI device after reset\n");
2307 return PCI_ERS_RESULT_DISCONNECT;
2308 }
2309
2310 /* Perform card reset only on one instance of the card */
2311 if (0 != PCI_FUNC (pdev->devfn))
2312 return PCI_ERS_RESULT_RECOVERED;
2313
2314 pci_set_master(pdev);
2315
2316 netif_carrier_off(netdev);
2317 netif_stop_queue(netdev);
2318 ixgb_reset(adapter);
2319
2320 /* Make sure the EEPROM is good */
2321 if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
2322 netif_err(adapter, probe, adapter->netdev,
2323 "After reset, the EEPROM checksum is not valid\n");
2324 return PCI_ERS_RESULT_DISCONNECT;
2325 }
2326 ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
2327 memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
2328
2329 if (!is_valid_ether_addr(netdev->perm_addr)) {
2330 netif_err(adapter, probe, adapter->netdev,
2331 "After reset, invalid MAC address\n");
2332 return PCI_ERS_RESULT_DISCONNECT;
2333 }
2334
2335 return PCI_ERS_RESULT_RECOVERED;
2336 }
2337
2338 /**
2339 * ixgb_io_resume - called when its OK to resume normal operations
2340 * @pdev pointer to pci device with error
2341 *
2342 * The error recovery driver tells us that its OK to resume
2343 * normal operation. Implementation resembles the second-half
2344 * of the ixgb_probe() routine.
2345 */
2346 static void ixgb_io_resume(struct pci_dev *pdev)
2347 {
2348 struct net_device *netdev = pci_get_drvdata(pdev);
2349 struct ixgb_adapter *adapter = netdev_priv(netdev);
2350
2351 pci_set_master(pdev);
2352
2353 if (netif_running(netdev)) {
2354 if (ixgb_up(adapter)) {
2355 pr_err("can't bring device back up after reset\n");
2356 return;
2357 }
2358 }
2359
2360 netif_device_attach(netdev);
2361 mod_timer(&adapter->watchdog_timer, jiffies);
2362 }
2363
2364 /* ixgb_main.c */
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree