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ixgb: fix unload race with timers
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / net / ixgb / ixgb_main.c
blob79082eb577c6757b1cbbd2fff35018fc15b1adaa
1 /*******************************************************************************
2
3 Intel PRO/10GbE Linux driver
4 Copyright(c) 1999 - 2006 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 #include "ixgb.h"
30
31 char ixgb_driver_name[] = "ixgb";
32 static char ixgb_driver_string[] = "Intel(R) PRO/10GbE Network Driver";
33
34 #ifndef CONFIG_IXGB_NAPI
35 #define DRIVERNAPI
36 #else
37 #define DRIVERNAPI "-NAPI"
38 #endif
39 #define DRV_VERSION "1.0.126-k4"DRIVERNAPI
40 const char ixgb_driver_version[] = DRV_VERSION;
41 static const char ixgb_copyright[] = "Copyright (c) 1999-2006 Intel Corporation.";
42
43 /* ixgb_pci_tbl - PCI Device ID Table
44 *
45 * Wildcard entries (PCI_ANY_ID) should come last
46 * Last entry must be all 0s
47 *
48 * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
49 * Class, Class Mask, private data (not used) }
50 */
51 static struct pci_device_id ixgb_pci_tbl[] = {
52 {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX,
53 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
54 {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_CX4,
55 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
56 {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_SR,
57 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
58 {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_LR,
59 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
60
61 /* required last entry */
62 {0,}
63 };
64
65 MODULE_DEVICE_TABLE(pci, ixgb_pci_tbl);
66
67 /* Local Function Prototypes */
68
69 int ixgb_up(struct ixgb_adapter *adapter);
70 void ixgb_down(struct ixgb_adapter *adapter, bool kill_watchdog);
71 void ixgb_reset(struct ixgb_adapter *adapter);
72 int ixgb_setup_tx_resources(struct ixgb_adapter *adapter);
73 int ixgb_setup_rx_resources(struct ixgb_adapter *adapter);
74 void ixgb_free_tx_resources(struct ixgb_adapter *adapter);
75 void ixgb_free_rx_resources(struct ixgb_adapter *adapter);
76 void ixgb_update_stats(struct ixgb_adapter *adapter);
77
78 static int ixgb_init_module(void);
79 static void ixgb_exit_module(void);
80 static int ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
81 static void __devexit ixgb_remove(struct pci_dev *pdev);
82 static int ixgb_sw_init(struct ixgb_adapter *adapter);
83 static int ixgb_open(struct net_device *netdev);
84 static int ixgb_close(struct net_device *netdev);
85 static void ixgb_configure_tx(struct ixgb_adapter *adapter);
86 static void ixgb_configure_rx(struct ixgb_adapter *adapter);
87 static void ixgb_setup_rctl(struct ixgb_adapter *adapter);
88 static void ixgb_clean_tx_ring(struct ixgb_adapter *adapter);
89 static void ixgb_clean_rx_ring(struct ixgb_adapter *adapter);
90 static void ixgb_set_multi(struct net_device *netdev);
91 static void ixgb_watchdog(unsigned long data);
92 static int ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev);
93 static struct net_device_stats *ixgb_get_stats(struct net_device *netdev);
94 static int ixgb_change_mtu(struct net_device *netdev, int new_mtu);
95 static int ixgb_set_mac(struct net_device *netdev, void *p);
96 static irqreturn_t ixgb_intr(int irq, void *data);
97 static bool ixgb_clean_tx_irq(struct ixgb_adapter *adapter);
98
99 #ifdef CONFIG_IXGB_NAPI
100 static int ixgb_clean(struct napi_struct *napi, int budget);
101 static bool ixgb_clean_rx_irq(struct ixgb_adapter *adapter,
102 int *work_done, int work_to_do);
103 #else
104 static bool ixgb_clean_rx_irq(struct ixgb_adapter *adapter);
105 #endif
106 static void ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter);
107 static void ixgb_tx_timeout(struct net_device *dev);
108 static void ixgb_tx_timeout_task(struct work_struct *work);
109 static void ixgb_vlan_rx_register(struct net_device *netdev,
110 struct vlan_group *grp);
111 static void ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid);
112 static void ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid);
113 static void ixgb_restore_vlan(struct ixgb_adapter *adapter);
114
115 #ifdef CONFIG_NET_POLL_CONTROLLER
116 /* for netdump / net console */
117 static void ixgb_netpoll(struct net_device *dev);
118 #endif
119
120 static pci_ers_result_t ixgb_io_error_detected (struct pci_dev *pdev,
121 enum pci_channel_state state);
122 static pci_ers_result_t ixgb_io_slot_reset (struct pci_dev *pdev);
123 static void ixgb_io_resume (struct pci_dev *pdev);
124
125 static struct pci_error_handlers ixgb_err_handler = {
126 .error_detected = ixgb_io_error_detected,
127 .slot_reset = ixgb_io_slot_reset,
128 .resume = ixgb_io_resume,
129 };
130
131 static struct pci_driver ixgb_driver = {
132 .name = ixgb_driver_name,
133 .id_table = ixgb_pci_tbl,
134 .probe = ixgb_probe,
135 .remove = __devexit_p(ixgb_remove),
136 .err_handler = &ixgb_err_handler
137 };
138
139 MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
140 MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver");
141 MODULE_LICENSE("GPL");
142 MODULE_VERSION(DRV_VERSION);
143
144 #define DEFAULT_DEBUG_LEVEL_SHIFT 3
145 static int debug = DEFAULT_DEBUG_LEVEL_SHIFT;
146 module_param(debug, int, 0);
147 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
148
149 /**
150 * ixgb_init_module - Driver Registration Routine
151 *
152 * ixgb_init_module is the first routine called when the driver is
153 * loaded. All it does is register with the PCI subsystem.
154 **/
155
156 static int __init
157 ixgb_init_module(void)
158 {
159 printk(KERN_INFO "%s - version %s\n",
160 ixgb_driver_string, ixgb_driver_version);
161
162 printk(KERN_INFO "%s\n", ixgb_copyright);
163
164 return pci_register_driver(&ixgb_driver);
165 }
166
167 module_init(ixgb_init_module);
168
169 /**
170 * ixgb_exit_module - Driver Exit Cleanup Routine
171 *
172 * ixgb_exit_module is called just before the driver is removed
173 * from memory.
174 **/
175
176 static void __exit
177 ixgb_exit_module(void)
178 {
179 pci_unregister_driver(&ixgb_driver);
180 }
181
182 module_exit(ixgb_exit_module);
183
184 /**
185 * ixgb_irq_disable - Mask off interrupt generation on the NIC
186 * @adapter: board private structure
187 **/
188
189 static void
190 ixgb_irq_disable(struct ixgb_adapter *adapter)
191 {
192 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
193 IXGB_WRITE_FLUSH(&adapter->hw);
194 synchronize_irq(adapter->pdev->irq);
195 }
196
197 /**
198 * ixgb_irq_enable - Enable default interrupt generation settings
199 * @adapter: board private structure
200 **/
201
202 static void
203 ixgb_irq_enable(struct ixgb_adapter *adapter)
204 {
205 u32 val = IXGB_INT_RXT0 | IXGB_INT_RXDMT0 |
206 IXGB_INT_TXDW | IXGB_INT_LSC;
207 if (adapter->hw.subsystem_vendor_id == SUN_SUBVENDOR_ID)
208 val |= IXGB_INT_GPI0;
209 IXGB_WRITE_REG(&adapter->hw, IMS, val);
210 IXGB_WRITE_FLUSH(&adapter->hw);
211 }
212
213 int
214 ixgb_up(struct ixgb_adapter *adapter)
215 {
216 struct net_device *netdev = adapter->netdev;
217 int err, irq_flags = IRQF_SHARED;
218 int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
219 struct ixgb_hw *hw = &adapter->hw;
220
221 /* hardware has been reset, we need to reload some things */
222
223 ixgb_rar_set(hw, netdev->dev_addr, 0);
224 ixgb_set_multi(netdev);
225
226 ixgb_restore_vlan(adapter);
227
228 ixgb_configure_tx(adapter);
229 ixgb_setup_rctl(adapter);
230 ixgb_configure_rx(adapter);
231 ixgb_alloc_rx_buffers(adapter);
232
233 /* disable interrupts and get the hardware into a known state */
234 IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);
235
236 /* only enable MSI if bus is in PCI-X mode */
237 if (IXGB_READ_REG(&adapter->hw, STATUS) & IXGB_STATUS_PCIX_MODE) {
238 err = pci_enable_msi(adapter->pdev);
239 if (!err) {
240 adapter->have_msi = 1;
241 irq_flags = 0;
242 }
243 /* proceed to try to request regular interrupt */
244 }
245
246 err = request_irq(adapter->pdev->irq, &ixgb_intr, irq_flags,
247 netdev->name, netdev);
248 if (err) {
249 if (adapter->have_msi)
250 pci_disable_msi(adapter->pdev);
251 DPRINTK(PROBE, ERR,
252 "Unable to allocate interrupt Error: %d\n", err);
253 return err;
254 }
255
256 if((hw->max_frame_size != max_frame) ||
257 (hw->max_frame_size !=
258 (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {
259
260 hw->max_frame_size = max_frame;
261
262 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
263
264 if(hw->max_frame_size >
265 IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
266 u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
267
268 if(!(ctrl0 & IXGB_CTRL0_JFE)) {
269 ctrl0 |= IXGB_CTRL0_JFE;
270 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
271 }
272 }
273 }
274
275 clear_bit(__IXGB_DOWN, &adapter->flags);
276
277 #ifdef CONFIG_IXGB_NAPI
278 napi_enable(&adapter->napi);
279 #endif
280 ixgb_irq_enable(adapter);
281
282 mod_timer(&adapter->watchdog_timer, jiffies);
283
284 return 0;
285 }
286
287 void
288 ixgb_down(struct ixgb_adapter *adapter, bool kill_watchdog)
289 {
290 struct net_device *netdev = adapter->netdev;
291
292 /* prevent the interrupt handler from restarting watchdog */
293 set_bit(__IXGB_DOWN, &adapter->flags);
294
295 #ifdef CONFIG_IXGB_NAPI
296 napi_disable(&adapter->napi);
297 #endif
298 /* waiting for NAPI to complete can re-enable interrupts */
299 ixgb_irq_disable(adapter);
300 free_irq(adapter->pdev->irq, netdev);
301
302 if (adapter->have_msi)
303 pci_disable_msi(adapter->pdev);
304
305 if(kill_watchdog)
306 del_timer_sync(&adapter->watchdog_timer);
307
308 adapter->link_speed = 0;
309 adapter->link_duplex = 0;
310 netif_carrier_off(netdev);
311 netif_stop_queue(netdev);
312
313 ixgb_reset(adapter);
314 ixgb_clean_tx_ring(adapter);
315 ixgb_clean_rx_ring(adapter);
316 }
317
318 void
319 ixgb_reset(struct ixgb_adapter *adapter)
320 {
321 struct ixgb_hw *hw = &adapter->hw;
322
323 ixgb_adapter_stop(hw);
324 if (!ixgb_init_hw(hw))
325 DPRINTK(PROBE, ERR, "ixgb_init_hw failed.\n");
326
327 /* restore frame size information */
328 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
329 if (hw->max_frame_size >
330 IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
331 u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
332 if (!(ctrl0 & IXGB_CTRL0_JFE)) {
333 ctrl0 |= IXGB_CTRL0_JFE;
334 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
335 }
336 }
337 }
338
339 /**
340 * ixgb_probe - Device Initialization Routine
341 * @pdev: PCI device information struct
342 * @ent: entry in ixgb_pci_tbl
343 *
344 * Returns 0 on success, negative on failure
345 *
346 * ixgb_probe initializes an adapter identified by a pci_dev structure.
347 * The OS initialization, configuring of the adapter private structure,
348 * and a hardware reset occur.
349 **/
350
351 static int __devinit
352 ixgb_probe(struct pci_dev *pdev,
353 const struct pci_device_id *ent)
354 {
355 struct net_device *netdev = NULL;
356 struct ixgb_adapter *adapter;
357 static int cards_found = 0;
358 int pci_using_dac;
359 int i;
360 int err;
361
362 if((err = pci_enable_device(pdev)))
363 return err;
364
365 if(!(err = pci_set_dma_mask(pdev, DMA_64BIT_MASK)) &&
366 !(err = pci_set_consistent_dma_mask(pdev, DMA_64BIT_MASK))) {
367 pci_using_dac = 1;
368 } else {
369 if((err = pci_set_dma_mask(pdev, DMA_32BIT_MASK)) ||
370 (err = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK))) {
371 printk(KERN_ERR
372 "ixgb: No usable DMA configuration, aborting\n");
373 goto err_dma_mask;
374 }
375 pci_using_dac = 0;
376 }
377
378 if((err = pci_request_regions(pdev, ixgb_driver_name)))
379 goto err_request_regions;
380
381 pci_set_master(pdev);
382
383 netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
384 if(!netdev) {
385 err = -ENOMEM;
386 goto err_alloc_etherdev;
387 }
388
389 SET_NETDEV_DEV(netdev, &pdev->dev);
390
391 pci_set_drvdata(pdev, netdev);
392 adapter = netdev_priv(netdev);
393 adapter->netdev = netdev;
394 adapter->pdev = pdev;
395 adapter->hw.back = adapter;
396 adapter->msg_enable = netif_msg_init(debug, DEFAULT_DEBUG_LEVEL_SHIFT);
397
398 adapter->hw.hw_addr = ioremap(pci_resource_start(pdev, BAR_0),
399 pci_resource_len(pdev, BAR_0));
400 if (!adapter->hw.hw_addr) {
401 err = -EIO;
402 goto err_ioremap;
403 }
404
405 for(i = BAR_1; i <= BAR_5; i++) {
406 if(pci_resource_len(pdev, i) == 0)
407 continue;
408 if(pci_resource_flags(pdev, i) & IORESOURCE_IO) {
409 adapter->hw.io_base = pci_resource_start(pdev, i);
410 break;
411 }
412 }
413
414 netdev->open = &ixgb_open;
415 netdev->stop = &ixgb_close;
416 netdev->hard_start_xmit = &ixgb_xmit_frame;
417 netdev->get_stats = &ixgb_get_stats;
418 netdev->set_multicast_list = &ixgb_set_multi;
419 netdev->set_mac_address = &ixgb_set_mac;
420 netdev->change_mtu = &ixgb_change_mtu;
421 ixgb_set_ethtool_ops(netdev);
422 netdev->tx_timeout = &ixgb_tx_timeout;
423 netdev->watchdog_timeo = 5 * HZ;
424 #ifdef CONFIG_IXGB_NAPI
425 netif_napi_add(netdev, &adapter->napi, ixgb_clean, 64);
426 #endif
427 netdev->vlan_rx_register = ixgb_vlan_rx_register;
428 netdev->vlan_rx_add_vid = ixgb_vlan_rx_add_vid;
429 netdev->vlan_rx_kill_vid = ixgb_vlan_rx_kill_vid;
430 #ifdef CONFIG_NET_POLL_CONTROLLER
431 netdev->poll_controller = ixgb_netpoll;
432 #endif
433
434 strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
435
436 adapter->bd_number = cards_found;
437 adapter->link_speed = 0;
438 adapter->link_duplex = 0;
439
440 /* setup the private structure */
441
442 if((err = ixgb_sw_init(adapter)))
443 goto err_sw_init;
444
445 netdev->features = NETIF_F_SG |
446 NETIF_F_HW_CSUM |
447 NETIF_F_HW_VLAN_TX |
448 NETIF_F_HW_VLAN_RX |
449 NETIF_F_HW_VLAN_FILTER;
450 netdev->features |= NETIF_F_TSO;
451 #ifdef NETIF_F_LLTX
452 netdev->features |= NETIF_F_LLTX;
453 #endif
454
455 if(pci_using_dac)
456 netdev->features |= NETIF_F_HIGHDMA;
457
458 /* make sure the EEPROM is good */
459
460 if(!ixgb_validate_eeprom_checksum(&adapter->hw)) {
461 DPRINTK(PROBE, ERR, "The EEPROM Checksum Is Not Valid\n");
462 err = -EIO;
463 goto err_eeprom;
464 }
465
466 ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
467 memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
468
469 if(!is_valid_ether_addr(netdev->perm_addr)) {
470 DPRINTK(PROBE, ERR, "Invalid MAC Address\n");
471 err = -EIO;
472 goto err_eeprom;
473 }
474
475 adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
476
477 init_timer(&adapter->watchdog_timer);
478 adapter->watchdog_timer.function = &ixgb_watchdog;
479 adapter->watchdog_timer.data = (unsigned long)adapter;
480
481 INIT_WORK(&adapter->tx_timeout_task, ixgb_tx_timeout_task);
482
483 strcpy(netdev->name, "eth%d");
484 if((err = register_netdev(netdev)))
485 goto err_register;
486
487 /* we're going to reset, so assume we have no link for now */
488
489 netif_carrier_off(netdev);
490 netif_stop_queue(netdev);
491
492 DPRINTK(PROBE, INFO, "Intel(R) PRO/10GbE Network Connection\n");
493 ixgb_check_options(adapter);
494 /* reset the hardware with the new settings */
495
496 ixgb_reset(adapter);
497
498 cards_found++;
499 return 0;
500
501 err_register:
502 err_sw_init:
503 err_eeprom:
504 iounmap(adapter->hw.hw_addr);
505 err_ioremap:
506 free_netdev(netdev);
507 err_alloc_etherdev:
508 pci_release_regions(pdev);
509 err_request_regions:
510 err_dma_mask:
511 pci_disable_device(pdev);
512 return err;
513 }
514
515 /**
516 * ixgb_remove - Device Removal Routine
517 * @pdev: PCI device information struct
518 *
519 * ixgb_remove is called by the PCI subsystem to alert the driver
520 * that it should release a PCI device. The could be caused by a
521 * Hot-Plug event, or because the driver is going to be removed from
522 * memory.
523 **/
524
525 static void __devexit
526 ixgb_remove(struct pci_dev *pdev)
527 {
528 struct net_device *netdev = pci_get_drvdata(pdev);
529 struct ixgb_adapter *adapter = netdev_priv(netdev);
530
531 flush_scheduled_work();
532
533 unregister_netdev(netdev);
534
535 iounmap(adapter->hw.hw_addr);
536 pci_release_regions(pdev);
537
538 free_netdev(netdev);
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 DPRINTK(PROBE, ERR, "unsupported device id\n");
575 }
576
577 /* enable flow control to be programmed */
578 hw->fc.send_xon = 1;
579
580 spin_lock_init(&adapter->tx_lock);
581
582 set_bit(__IXGB_DOWN, &adapter->flags);
583 return 0;
584 }
585
586 /**
587 * ixgb_open - Called when a network interface is made active
588 * @netdev: network interface device structure
589 *
590 * Returns 0 on success, negative value on failure
591 *
592 * The open entry point is called when a network interface is made
593 * active by the system (IFF_UP). At this point all resources needed
594 * for transmit and receive operations are allocated, the interrupt
595 * handler is registered with the OS, the watchdog timer is started,
596 * and the stack is notified that the interface is ready.
597 **/
598
599 static int
600 ixgb_open(struct net_device *netdev)
601 {
602 struct ixgb_adapter *adapter = netdev_priv(netdev);
603 int err;
604
605 /* allocate transmit descriptors */
606
607 if((err = ixgb_setup_tx_resources(adapter)))
608 goto err_setup_tx;
609
610 /* allocate receive descriptors */
611
612 if((err = ixgb_setup_rx_resources(adapter)))
613 goto err_setup_rx;
614
615 if((err = ixgb_up(adapter)))
616 goto err_up;
617
618 return 0;
619
620 err_up:
621 ixgb_free_rx_resources(adapter);
622 err_setup_rx:
623 ixgb_free_tx_resources(adapter);
624 err_setup_tx:
625 ixgb_reset(adapter);
626
627 return err;
628 }
629
630 /**
631 * ixgb_close - Disables a network interface
632 * @netdev: network interface device structure
633 *
634 * Returns 0, this is not allowed to fail
635 *
636 * The close entry point is called when an interface is de-activated
637 * by the OS. The hardware is still under the drivers control, but
638 * needs to be disabled. A global MAC reset is issued to stop the
639 * hardware, and all transmit and receive resources are freed.
640 **/
641
642 static int
643 ixgb_close(struct net_device *netdev)
644 {
645 struct ixgb_adapter *adapter = netdev_priv(netdev);
646
647 ixgb_down(adapter, true);
648
649 ixgb_free_tx_resources(adapter);
650 ixgb_free_rx_resources(adapter);
651
652 return 0;
653 }
654
655 /**
656 * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
657 * @adapter: board private structure
658 *
659 * Return 0 on success, negative on failure
660 **/
661
662 int
663 ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
664 {
665 struct ixgb_desc_ring *txdr = &adapter->tx_ring;
666 struct pci_dev *pdev = adapter->pdev;
667 int size;
668
669 size = sizeof(struct ixgb_buffer) * txdr->count;
670 txdr->buffer_info = vmalloc(size);
671 if(!txdr->buffer_info) {
672 DPRINTK(PROBE, ERR,
673 "Unable to allocate transmit descriptor ring memory\n");
674 return -ENOMEM;
675 }
676 memset(txdr->buffer_info, 0, size);
677
678 /* round up to nearest 4K */
679
680 txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
681 txdr->size = ALIGN(txdr->size, 4096);
682
683 txdr->desc = pci_alloc_consistent(pdev, txdr->size, &txdr->dma);
684 if(!txdr->desc) {
685 vfree(txdr->buffer_info);
686 DPRINTK(PROBE, ERR,
687 "Unable to allocate transmit descriptor memory\n");
688 return -ENOMEM;
689 }
690 memset(txdr->desc, 0, txdr->size);
691
692 txdr->next_to_use = 0;
693 txdr->next_to_clean = 0;
694
695 return 0;
696 }
697
698 /**
699 * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
700 * @adapter: board private structure
701 *
702 * Configure the Tx unit of the MAC after a reset.
703 **/
704
705 static void
706 ixgb_configure_tx(struct ixgb_adapter *adapter)
707 {
708 u64 tdba = adapter->tx_ring.dma;
709 u32 tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
710 u32 tctl;
711 struct ixgb_hw *hw = &adapter->hw;
712
713 /* Setup the Base and Length of the Tx Descriptor Ring
714 * tx_ring.dma can be either a 32 or 64 bit value
715 */
716
717 IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
718 IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
719
720 IXGB_WRITE_REG(hw, TDLEN, tdlen);
721
722 /* Setup the HW Tx Head and Tail descriptor pointers */
723
724 IXGB_WRITE_REG(hw, TDH, 0);
725 IXGB_WRITE_REG(hw, TDT, 0);
726
727 /* don't set up txdctl, it induces performance problems if configured
728 * incorrectly */
729 /* Set the Tx Interrupt Delay register */
730
731 IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
732
733 /* Program the Transmit Control Register */
734
735 tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
736 IXGB_WRITE_REG(hw, TCTL, tctl);
737
738 /* Setup Transmit Descriptor Settings for this adapter */
739 adapter->tx_cmd_type =
740 IXGB_TX_DESC_TYPE
741 | (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
742 }
743
744 /**
745 * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
746 * @adapter: board private structure
747 *
748 * Returns 0 on success, negative on failure
749 **/
750
751 int
752 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
753 {
754 struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
755 struct pci_dev *pdev = adapter->pdev;
756 int size;
757
758 size = sizeof(struct ixgb_buffer) * rxdr->count;
759 rxdr->buffer_info = vmalloc(size);
760 if(!rxdr->buffer_info) {
761 DPRINTK(PROBE, ERR,
762 "Unable to allocate receive descriptor ring\n");
763 return -ENOMEM;
764 }
765 memset(rxdr->buffer_info, 0, size);
766
767 /* Round up to nearest 4K */
768
769 rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
770 rxdr->size = ALIGN(rxdr->size, 4096);
771
772 rxdr->desc = pci_alloc_consistent(pdev, rxdr->size, &rxdr->dma);
773
774 if(!rxdr->desc) {
775 vfree(rxdr->buffer_info);
776 DPRINTK(PROBE, ERR,
777 "Unable to allocate receive descriptors\n");
778 return -ENOMEM;
779 }
780 memset(rxdr->desc, 0, rxdr->size);
781
782 rxdr->next_to_clean = 0;
783 rxdr->next_to_use = 0;
784
785 return 0;
786 }
787
788 /**
789 * ixgb_setup_rctl - configure the receive control register
790 * @adapter: Board private structure
791 **/
792
793 static void
794 ixgb_setup_rctl(struct ixgb_adapter *adapter)
795 {
796 u32 rctl;
797
798 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
799
800 rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
801
802 rctl |=
803 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
804 IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
805 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
806
807 rctl |= IXGB_RCTL_SECRC;
808
809 if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048)
810 rctl |= IXGB_RCTL_BSIZE_2048;
811 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096)
812 rctl |= IXGB_RCTL_BSIZE_4096;
813 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192)
814 rctl |= IXGB_RCTL_BSIZE_8192;
815 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384)
816 rctl |= IXGB_RCTL_BSIZE_16384;
817
818 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
819 }
820
821 /**
822 * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
823 * @adapter: board private structure
824 *
825 * Configure the Rx unit of the MAC after a reset.
826 **/
827
828 static void
829 ixgb_configure_rx(struct ixgb_adapter *adapter)
830 {
831 u64 rdba = adapter->rx_ring.dma;
832 u32 rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
833 struct ixgb_hw *hw = &adapter->hw;
834 u32 rctl;
835 u32 rxcsum;
836
837 /* make sure receives are disabled while setting up the descriptors */
838
839 rctl = IXGB_READ_REG(hw, RCTL);
840 IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
841
842 /* set the Receive Delay Timer Register */
843
844 IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
845
846 /* Setup the Base and Length of the Rx Descriptor Ring */
847
848 IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
849 IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
850
851 IXGB_WRITE_REG(hw, RDLEN, rdlen);
852
853 /* Setup the HW Rx Head and Tail Descriptor Pointers */
854 IXGB_WRITE_REG(hw, RDH, 0);
855 IXGB_WRITE_REG(hw, RDT, 0);
856
857 /* due to the hardware errata with RXDCTL, we are unable to use any of
858 * the performance enhancing features of it without causing other
859 * subtle bugs, some of the bugs could include receive length
860 * corruption at high data rates (WTHRESH > 0) and/or receive
861 * descriptor ring irregularites (particularly in hardware cache) */
862 IXGB_WRITE_REG(hw, RXDCTL, 0);
863
864 /* Enable Receive Checksum Offload for TCP and UDP */
865 if (adapter->rx_csum) {
866 rxcsum = IXGB_READ_REG(hw, RXCSUM);
867 rxcsum |= IXGB_RXCSUM_TUOFL;
868 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
869 }
870
871 /* Enable Receives */
872
873 IXGB_WRITE_REG(hw, RCTL, rctl);
874 }
875
876 /**
877 * ixgb_free_tx_resources - Free Tx Resources
878 * @adapter: board private structure
879 *
880 * Free all transmit software resources
881 **/
882
883 void
884 ixgb_free_tx_resources(struct ixgb_adapter *adapter)
885 {
886 struct pci_dev *pdev = adapter->pdev;
887
888 ixgb_clean_tx_ring(adapter);
889
890 vfree(adapter->tx_ring.buffer_info);
891 adapter->tx_ring.buffer_info = NULL;
892
893 pci_free_consistent(pdev, adapter->tx_ring.size,
894 adapter->tx_ring.desc, adapter->tx_ring.dma);
895
896 adapter->tx_ring.desc = NULL;
897 }
898
899 static void
900 ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
901 struct ixgb_buffer *buffer_info)
902 {
903 struct pci_dev *pdev = adapter->pdev;
904
905 if (buffer_info->dma)
906 pci_unmap_page(pdev, buffer_info->dma, buffer_info->length,
907 PCI_DMA_TODEVICE);
908
909 if (buffer_info->skb)
910 dev_kfree_skb_any(buffer_info->skb);
911
912 buffer_info->skb = NULL;
913 buffer_info->dma = 0;
914 buffer_info->time_stamp = 0;
915 /* these fields must always be initialized in tx
916 * buffer_info->length = 0;
917 * buffer_info->next_to_watch = 0; */
918 }
919
920 /**
921 * ixgb_clean_tx_ring - Free Tx Buffers
922 * @adapter: board private structure
923 **/
924
925 static void
926 ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
927 {
928 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
929 struct ixgb_buffer *buffer_info;
930 unsigned long size;
931 unsigned int i;
932
933 /* Free all the Tx ring sk_buffs */
934
935 for(i = 0; i < tx_ring->count; i++) {
936 buffer_info = &tx_ring->buffer_info[i];
937 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
938 }
939
940 size = sizeof(struct ixgb_buffer) * tx_ring->count;
941 memset(tx_ring->buffer_info, 0, size);
942
943 /* Zero out the descriptor ring */
944
945 memset(tx_ring->desc, 0, tx_ring->size);
946
947 tx_ring->next_to_use = 0;
948 tx_ring->next_to_clean = 0;
949
950 IXGB_WRITE_REG(&adapter->hw, TDH, 0);
951 IXGB_WRITE_REG(&adapter->hw, TDT, 0);
952 }
953
954 /**
955 * ixgb_free_rx_resources - Free Rx Resources
956 * @adapter: board private structure
957 *
958 * Free all receive software resources
959 **/
960
961 void
962 ixgb_free_rx_resources(struct ixgb_adapter *adapter)
963 {
964 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
965 struct pci_dev *pdev = adapter->pdev;
966
967 ixgb_clean_rx_ring(adapter);
968
969 vfree(rx_ring->buffer_info);
970 rx_ring->buffer_info = NULL;
971
972 pci_free_consistent(pdev, rx_ring->size, rx_ring->desc, rx_ring->dma);
973
974 rx_ring->desc = NULL;
975 }
976
977 /**
978 * ixgb_clean_rx_ring - Free Rx Buffers
979 * @adapter: board private structure
980 **/
981
982 static void
983 ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
984 {
985 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
986 struct ixgb_buffer *buffer_info;
987 struct pci_dev *pdev = adapter->pdev;
988 unsigned long size;
989 unsigned int i;
990
991 /* Free all the Rx ring sk_buffs */
992
993 for(i = 0; i < rx_ring->count; i++) {
994 buffer_info = &rx_ring->buffer_info[i];
995 if(buffer_info->skb) {
996
997 pci_unmap_single(pdev,
998 buffer_info->dma,
999 buffer_info->length,
1000 PCI_DMA_FROMDEVICE);
1001
1002 dev_kfree_skb(buffer_info->skb);
1003
1004 buffer_info->skb = NULL;
1005 }
1006 }
1007
1008 size = sizeof(struct ixgb_buffer) * rx_ring->count;
1009 memset(rx_ring->buffer_info, 0, size);
1010
1011 /* Zero out the descriptor ring */
1012
1013 memset(rx_ring->desc, 0, rx_ring->size);
1014
1015 rx_ring->next_to_clean = 0;
1016 rx_ring->next_to_use = 0;
1017
1018 IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1019 IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1020 }
1021
1022 /**
1023 * ixgb_set_mac - Change the Ethernet Address of the NIC
1024 * @netdev: network interface device structure
1025 * @p: pointer to an address structure
1026 *
1027 * Returns 0 on success, negative on failure
1028 **/
1029
1030 static int
1031 ixgb_set_mac(struct net_device *netdev, void *p)
1032 {
1033 struct ixgb_adapter *adapter = netdev_priv(netdev);
1034 struct sockaddr *addr = p;
1035
1036 if(!is_valid_ether_addr(addr->sa_data))
1037 return -EADDRNOTAVAIL;
1038
1039 memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1040
1041 ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1042
1043 return 0;
1044 }
1045
1046 /**
1047 * ixgb_set_multi - Multicast and Promiscuous mode set
1048 * @netdev: network interface device structure
1049 *
1050 * The set_multi entry point is called whenever the multicast address
1051 * list or the network interface flags are updated. This routine is
1052 * responsible for configuring the hardware for proper multicast,
1053 * promiscuous mode, and all-multi behavior.
1054 **/
1055
1056 static void
1057 ixgb_set_multi(struct net_device *netdev)
1058 {
1059 struct ixgb_adapter *adapter = netdev_priv(netdev);
1060 struct ixgb_hw *hw = &adapter->hw;
1061 struct dev_mc_list *mc_ptr;
1062 u32 rctl;
1063 int i;
1064
1065 /* Check for Promiscuous and All Multicast modes */
1066
1067 rctl = IXGB_READ_REG(hw, RCTL);
1068
1069 if(netdev->flags & IFF_PROMISC) {
1070 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1071 } else if(netdev->flags & IFF_ALLMULTI) {
1072 rctl |= IXGB_RCTL_MPE;
1073 rctl &= ~IXGB_RCTL_UPE;
1074 } else {
1075 rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1076 }
1077
1078 if(netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1079 rctl |= IXGB_RCTL_MPE;
1080 IXGB_WRITE_REG(hw, RCTL, rctl);
1081 } else {
1082 u8 mta[IXGB_MAX_NUM_MULTICAST_ADDRESSES *
1083 IXGB_ETH_LENGTH_OF_ADDRESS];
1084
1085 IXGB_WRITE_REG(hw, RCTL, rctl);
1086
1087 for(i = 0, mc_ptr = netdev->mc_list; mc_ptr;
1088 i++, mc_ptr = mc_ptr->next)
1089 memcpy(&mta[i * IXGB_ETH_LENGTH_OF_ADDRESS],
1090 mc_ptr->dmi_addr, IXGB_ETH_LENGTH_OF_ADDRESS);
1091
1092 ixgb_mc_addr_list_update(hw, mta, netdev->mc_count, 0);
1093 }
1094 }
1095
1096 /**
1097 * ixgb_watchdog - Timer Call-back
1098 * @data: pointer to netdev cast into an unsigned long
1099 **/
1100
1101 static void
1102 ixgb_watchdog(unsigned long data)
1103 {
1104 struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
1105 struct net_device *netdev = adapter->netdev;
1106 struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1107
1108 ixgb_check_for_link(&adapter->hw);
1109
1110 if (ixgb_check_for_bad_link(&adapter->hw)) {
1111 /* force the reset path */
1112 netif_stop_queue(netdev);
1113 }
1114
1115 if(adapter->hw.link_up) {
1116 if(!netif_carrier_ok(netdev)) {
1117 DPRINTK(LINK, INFO,
1118 "NIC Link is Up 10000 Mbps Full Duplex\n");
1119 adapter->link_speed = 10000;
1120 adapter->link_duplex = FULL_DUPLEX;
1121 netif_carrier_on(netdev);
1122 netif_wake_queue(netdev);
1123 }
1124 } else {
1125 if(netif_carrier_ok(netdev)) {
1126 adapter->link_speed = 0;
1127 adapter->link_duplex = 0;
1128 DPRINTK(LINK, INFO, "NIC Link is Down\n");
1129 netif_carrier_off(netdev);
1130 netif_stop_queue(netdev);
1131
1132 }
1133 }
1134
1135 ixgb_update_stats(adapter);
1136
1137 if(!netif_carrier_ok(netdev)) {
1138 if(IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1139 /* We've lost link, so the controller stops DMA,
1140 * but we've got queued Tx work that's never going
1141 * to get done, so reset controller to flush Tx.
1142 * (Do the reset outside of interrupt context). */
1143 schedule_work(&adapter->tx_timeout_task);
1144 }
1145 }
1146
1147 /* Force detection of hung controller every watchdog period */
1148 adapter->detect_tx_hung = true;
1149
1150 /* generate an interrupt to force clean up of any stragglers */
1151 IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1152
1153 /* Reset the timer */
1154 mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1155 }
1156
1157 #define IXGB_TX_FLAGS_CSUM 0x00000001
1158 #define IXGB_TX_FLAGS_VLAN 0x00000002
1159 #define IXGB_TX_FLAGS_TSO 0x00000004
1160
1161 static int
1162 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1163 {
1164 struct ixgb_context_desc *context_desc;
1165 unsigned int i;
1166 u8 ipcss, ipcso, tucss, tucso, hdr_len;
1167 u16 ipcse, tucse, mss;
1168 int err;
1169
1170 if (likely(skb_is_gso(skb))) {
1171 struct ixgb_buffer *buffer_info;
1172 struct iphdr *iph;
1173
1174 if (skb_header_cloned(skb)) {
1175 err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1176 if (err)
1177 return err;
1178 }
1179
1180 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
1181 mss = skb_shinfo(skb)->gso_size;
1182 iph = ip_hdr(skb);
1183 iph->tot_len = 0;
1184 iph->check = 0;
1185 tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
1186 iph->daddr, 0,
1187 IPPROTO_TCP, 0);
1188 ipcss = skb_network_offset(skb);
1189 ipcso = (void *)&(iph->check) - (void *)skb->data;
1190 ipcse = skb_transport_offset(skb) - 1;
1191 tucss = skb_transport_offset(skb);
1192 tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data;
1193 tucse = 0;
1194
1195 i = adapter->tx_ring.next_to_use;
1196 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1197 buffer_info = &adapter->tx_ring.buffer_info[i];
1198 WARN_ON(buffer_info->dma != 0);
1199
1200 context_desc->ipcss = ipcss;
1201 context_desc->ipcso = ipcso;
1202 context_desc->ipcse = cpu_to_le16(ipcse);
1203 context_desc->tucss = tucss;
1204 context_desc->tucso = tucso;
1205 context_desc->tucse = cpu_to_le16(tucse);
1206 context_desc->mss = cpu_to_le16(mss);
1207 context_desc->hdr_len = hdr_len;
1208 context_desc->status = 0;
1209 context_desc->cmd_type_len = cpu_to_le32(
1210 IXGB_CONTEXT_DESC_TYPE
1211 | IXGB_CONTEXT_DESC_CMD_TSE
1212 | IXGB_CONTEXT_DESC_CMD_IP
1213 | IXGB_CONTEXT_DESC_CMD_TCP
1214 | IXGB_CONTEXT_DESC_CMD_IDE
1215 | (skb->len - (hdr_len)));
1216
1217
1218 if(++i == adapter->tx_ring.count) i = 0;
1219 adapter->tx_ring.next_to_use = i;
1220
1221 return 1;
1222 }
1223
1224 return 0;
1225 }
1226
1227 static bool
1228 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1229 {
1230 struct ixgb_context_desc *context_desc;
1231 unsigned int i;
1232 u8 css, cso;
1233
1234 if(likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
1235 struct ixgb_buffer *buffer_info;
1236 css = skb_transport_offset(skb);
1237 cso = css + skb->csum_offset;
1238
1239 i = adapter->tx_ring.next_to_use;
1240 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1241 buffer_info = &adapter->tx_ring.buffer_info[i];
1242 WARN_ON(buffer_info->dma != 0);
1243
1244 context_desc->tucss = css;
1245 context_desc->tucso = cso;
1246 context_desc->tucse = 0;
1247 /* zero out any previously existing data in one instruction */
1248 *(u32 *)&(context_desc->ipcss) = 0;
1249 context_desc->status = 0;
1250 context_desc->hdr_len = 0;
1251 context_desc->mss = 0;
1252 context_desc->cmd_type_len =
1253 cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1254 | IXGB_TX_DESC_CMD_IDE);
1255
1256 if(++i == adapter->tx_ring.count) i = 0;
1257 adapter->tx_ring.next_to_use = i;
1258
1259 return true;
1260 }
1261
1262 return false;
1263 }
1264
1265 #define IXGB_MAX_TXD_PWR 14
1266 #define IXGB_MAX_DATA_PER_TXD (1<<IXGB_MAX_TXD_PWR)
1267
1268 static int
1269 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1270 unsigned int first)
1271 {
1272 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1273 struct ixgb_buffer *buffer_info;
1274 int len = skb->len;
1275 unsigned int offset = 0, size, count = 0, i;
1276 unsigned int mss = skb_shinfo(skb)->gso_size;
1277
1278 unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1279 unsigned int f;
1280
1281 len -= skb->data_len;
1282
1283 i = tx_ring->next_to_use;
1284
1285 while(len) {
1286 buffer_info = &tx_ring->buffer_info[i];
1287 size = min(len, IXGB_MAX_DATA_PER_TXD);
1288 /* Workaround for premature desc write-backs
1289 * in TSO mode. Append 4-byte sentinel desc */
1290 if (unlikely(mss && !nr_frags && size == len && size > 8))
1291 size -= 4;
1292
1293 buffer_info->length = size;
1294 WARN_ON(buffer_info->dma != 0);
1295 buffer_info->time_stamp = jiffies;
1296 buffer_info->dma =
1297 pci_map_single(adapter->pdev,
1298 skb->data + offset,
1299 size,
1300 PCI_DMA_TODEVICE);
1301 buffer_info->next_to_watch = 0;
1302
1303 len -= size;
1304 offset += size;
1305 count++;
1306 if(++i == tx_ring->count) i = 0;
1307 }
1308
1309 for(f = 0; f < nr_frags; f++) {
1310 struct skb_frag_struct *frag;
1311
1312 frag = &skb_shinfo(skb)->frags[f];
1313 len = frag->size;
1314 offset = 0;
1315
1316 while(len) {
1317 buffer_info = &tx_ring->buffer_info[i];
1318 size = min(len, IXGB_MAX_DATA_PER_TXD);
1319
1320 /* Workaround for premature desc write-backs
1321 * in TSO mode. Append 4-byte sentinel desc */
1322 if (unlikely(mss && (f == (nr_frags - 1))
1323 && size == len && size > 8))
1324 size -= 4;
1325
1326 buffer_info->length = size;
1327 buffer_info->time_stamp = jiffies;
1328 buffer_info->dma =
1329 pci_map_page(adapter->pdev,
1330 frag->page,
1331 frag->page_offset + offset,
1332 size,
1333 PCI_DMA_TODEVICE);
1334 buffer_info->next_to_watch = 0;
1335
1336 len -= size;
1337 offset += size;
1338 count++;
1339 if(++i == tx_ring->count) i = 0;
1340 }
1341 }
1342 i = (i == 0) ? tx_ring->count - 1 : i - 1;
1343 tx_ring->buffer_info[i].skb = skb;
1344 tx_ring->buffer_info[first].next_to_watch = i;
1345
1346 return count;
1347 }
1348
1349 static void
1350 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1351 {
1352 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1353 struct ixgb_tx_desc *tx_desc = NULL;
1354 struct ixgb_buffer *buffer_info;
1355 u32 cmd_type_len = adapter->tx_cmd_type;
1356 u8 status = 0;
1357 u8 popts = 0;
1358 unsigned int i;
1359
1360 if(tx_flags & IXGB_TX_FLAGS_TSO) {
1361 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1362 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1363 }
1364
1365 if(tx_flags & IXGB_TX_FLAGS_CSUM)
1366 popts |= IXGB_TX_DESC_POPTS_TXSM;
1367
1368 if(tx_flags & IXGB_TX_FLAGS_VLAN) {
1369 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1370 }
1371
1372 i = tx_ring->next_to_use;
1373
1374 while(count--) {
1375 buffer_info = &tx_ring->buffer_info[i];
1376 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1377 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1378 tx_desc->cmd_type_len =
1379 cpu_to_le32(cmd_type_len | buffer_info->length);
1380 tx_desc->status = status;
1381 tx_desc->popts = popts;
1382 tx_desc->vlan = cpu_to_le16(vlan_id);
1383
1384 if(++i == tx_ring->count) i = 0;
1385 }
1386
1387 tx_desc->cmd_type_len |= cpu_to_le32(IXGB_TX_DESC_CMD_EOP
1388 | IXGB_TX_DESC_CMD_RS );
1389
1390 /* Force memory writes to complete before letting h/w
1391 * know there are new descriptors to fetch. (Only
1392 * applicable for weak-ordered memory model archs,
1393 * such as IA-64). */
1394 wmb();
1395
1396 tx_ring->next_to_use = i;
1397 IXGB_WRITE_REG(&adapter->hw, TDT, i);
1398 }
1399
1400 static int __ixgb_maybe_stop_tx(struct net_device *netdev, int size)
1401 {
1402 struct ixgb_adapter *adapter = netdev_priv(netdev);
1403 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1404
1405 netif_stop_queue(netdev);
1406 /* Herbert's original patch had:
1407 * smp_mb__after_netif_stop_queue();
1408 * but since that doesn't exist yet, just open code it. */
1409 smp_mb();
1410
1411 /* We need to check again in a case another CPU has just
1412 * made room available. */
1413 if (likely(IXGB_DESC_UNUSED(tx_ring) < size))
1414 return -EBUSY;
1415
1416 /* A reprieve! */
1417 netif_start_queue(netdev);
1418 ++adapter->restart_queue;
1419 return 0;
1420 }
1421
1422 static int ixgb_maybe_stop_tx(struct net_device *netdev,
1423 struct ixgb_desc_ring *tx_ring, int size)
1424 {
1425 if (likely(IXGB_DESC_UNUSED(tx_ring) >= size))
1426 return 0;
1427 return __ixgb_maybe_stop_tx(netdev, size);
1428 }
1429
1430
1431 /* Tx Descriptors needed, worst case */
1432 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1433 (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1434 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) /* skb->date */ + \
1435 MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 /* for context */ \
1436 + 1 /* one more needed for sentinel TSO workaround */
1437
1438 static int
1439 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1440 {
1441 struct ixgb_adapter *adapter = netdev_priv(netdev);
1442 unsigned int first;
1443 unsigned int tx_flags = 0;
1444 unsigned long flags;
1445 int vlan_id = 0;
1446 int tso;
1447
1448 if (test_bit(__IXGB_DOWN, &adapter->flags)) {
1449 dev_kfree_skb(skb);
1450 return NETDEV_TX_OK;
1451 }
1452
1453 if(skb->len <= 0) {
1454 dev_kfree_skb_any(skb);
1455 return 0;
1456 }
1457
1458 #ifdef NETIF_F_LLTX
1459 if (!spin_trylock_irqsave(&adapter->tx_lock, flags)) {
1460 /* Collision - tell upper layer to requeue */
1461 local_irq_restore(flags);
1462 return NETDEV_TX_LOCKED;
1463 }
1464 #else
1465 spin_lock_irqsave(&adapter->tx_lock, flags);
1466 #endif
1467
1468 if (unlikely(ixgb_maybe_stop_tx(netdev, &adapter->tx_ring,
1469 DESC_NEEDED))) {
1470 netif_stop_queue(netdev);
1471 spin_unlock_irqrestore(&adapter->tx_lock, flags);
1472 return NETDEV_TX_BUSY;
1473 }
1474
1475 #ifndef NETIF_F_LLTX
1476 spin_unlock_irqrestore(&adapter->tx_lock, flags);
1477 #endif
1478
1479 if(adapter->vlgrp && vlan_tx_tag_present(skb)) {
1480 tx_flags |= IXGB_TX_FLAGS_VLAN;
1481 vlan_id = vlan_tx_tag_get(skb);
1482 }
1483
1484 first = adapter->tx_ring.next_to_use;
1485
1486 tso = ixgb_tso(adapter, skb);
1487 if (tso < 0) {
1488 dev_kfree_skb_any(skb);
1489 #ifdef NETIF_F_LLTX
1490 spin_unlock_irqrestore(&adapter->tx_lock, flags);
1491 #endif
1492 return NETDEV_TX_OK;
1493 }
1494
1495 if (likely(tso))
1496 tx_flags |= IXGB_TX_FLAGS_TSO;
1497 else if(ixgb_tx_csum(adapter, skb))
1498 tx_flags |= IXGB_TX_FLAGS_CSUM;
1499
1500 ixgb_tx_queue(adapter, ixgb_tx_map(adapter, skb, first), vlan_id,
1501 tx_flags);
1502
1503 netdev->trans_start = jiffies;
1504
1505 #ifdef NETIF_F_LLTX
1506 /* Make sure there is space in the ring for the next send. */
1507 ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED);
1508
1509 spin_unlock_irqrestore(&adapter->tx_lock, flags);
1510
1511 #endif
1512 return NETDEV_TX_OK;
1513 }
1514
1515 /**
1516 * ixgb_tx_timeout - Respond to a Tx Hang
1517 * @netdev: network interface device structure
1518 **/
1519
1520 static void
1521 ixgb_tx_timeout(struct net_device *netdev)
1522 {
1523 struct ixgb_adapter *adapter = netdev_priv(netdev);
1524
1525 /* Do the reset outside of interrupt context */
1526 schedule_work(&adapter->tx_timeout_task);
1527 }
1528
1529 static void
1530 ixgb_tx_timeout_task(struct work_struct *work)
1531 {
1532 struct ixgb_adapter *adapter =
1533 container_of(work, struct ixgb_adapter, tx_timeout_task);
1534
1535 adapter->tx_timeout_count++;
1536 ixgb_down(adapter, true);
1537 ixgb_up(adapter);
1538 }
1539
1540 /**
1541 * ixgb_get_stats - Get System Network Statistics
1542 * @netdev: network interface device structure
1543 *
1544 * Returns the address of the device statistics structure.
1545 * The statistics are actually updated from the timer callback.
1546 **/
1547
1548 static struct net_device_stats *
1549 ixgb_get_stats(struct net_device *netdev)
1550 {
1551 struct ixgb_adapter *adapter = netdev_priv(netdev);
1552
1553 return &adapter->net_stats;
1554 }
1555
1556 /**
1557 * ixgb_change_mtu - Change the Maximum Transfer Unit
1558 * @netdev: network interface device structure
1559 * @new_mtu: new value for maximum frame size
1560 *
1561 * Returns 0 on success, negative on failure
1562 **/
1563
1564 static int
1565 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1566 {
1567 struct ixgb_adapter *adapter = netdev_priv(netdev);
1568 int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1569 int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1570
1571 /* MTU < 68 is an error for IPv4 traffic, just don't allow it */
1572 if ((new_mtu < 68) ||
1573 (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
1574 DPRINTK(PROBE, ERR, "Invalid MTU setting %d\n", new_mtu);
1575 return -EINVAL;
1576 }
1577
1578 if (old_max_frame == max_frame)
1579 return 0;
1580
1581 if (netif_running(netdev))
1582 ixgb_down(adapter, true);
1583
1584 adapter->rx_buffer_len = max_frame + 8; /* + 8 for errata */
1585
1586 netdev->mtu = new_mtu;
1587
1588 if (netif_running(netdev))
1589 ixgb_up(adapter);
1590
1591 return 0;
1592 }
1593
1594 /**
1595 * ixgb_update_stats - Update the board statistics counters.
1596 * @adapter: board private structure
1597 **/
1598
1599 void
1600 ixgb_update_stats(struct ixgb_adapter *adapter)
1601 {
1602 struct net_device *netdev = adapter->netdev;
1603 struct pci_dev *pdev = adapter->pdev;
1604
1605 /* Prevent stats update while adapter is being reset */
1606 if (pci_channel_offline(pdev))
1607 return;
1608
1609 if((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1610 (netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1611 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1612 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1613 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1614 u64 bcast = ((u64)bcast_h << 32) | bcast_l;
1615
1616 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1617 /* fix up multicast stats by removing broadcasts */
1618 if(multi >= bcast)
1619 multi -= bcast;
1620
1621 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1622 adapter->stats.mprch += (multi >> 32);
1623 adapter->stats.bprcl += bcast_l;
1624 adapter->stats.bprch += bcast_h;
1625 } else {
1626 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1627 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1628 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1629 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1630 }
1631 adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1632 adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1633 adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1634 adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1635 adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1636 adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1637 adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1638 adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1639 adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1640 adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1641 adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1642 adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1643 adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1644 adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1645 adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1646 adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1647 adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1648 adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1649 adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1650 adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1651 adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1652 adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1653 adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1654 adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1655 adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1656 adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1657 adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1658 adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1659 adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1660 adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1661 adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1662 adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1663 adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1664 adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1665 adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1666 adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1667 adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1668 adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1669 adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1670 adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1671 adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1672 adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1673 adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1674 adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1675 adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1676 adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1677 adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1678 adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1679 adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1680 adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1681 adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1682 adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1683 adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1684 adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1685 adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1686 adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1687
1688 /* Fill out the OS statistics structure */
1689
1690 adapter->net_stats.rx_packets = adapter->stats.gprcl;
1691 adapter->net_stats.tx_packets = adapter->stats.gptcl;
1692 adapter->net_stats.rx_bytes = adapter->stats.gorcl;
1693 adapter->net_stats.tx_bytes = adapter->stats.gotcl;
1694 adapter->net_stats.multicast = adapter->stats.mprcl;
1695 adapter->net_stats.collisions = 0;
1696
1697 /* ignore RLEC as it reports errors for padded (<64bytes) frames
1698 * with a length in the type/len field */
1699 adapter->net_stats.rx_errors =
1700 /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1701 adapter->stats.ruc +
1702 adapter->stats.roc /*+ adapter->stats.rlec */ +
1703 adapter->stats.icbc +
1704 adapter->stats.ecbc + adapter->stats.mpc;
1705
1706 /* see above
1707 * adapter->net_stats.rx_length_errors = adapter->stats.rlec;
1708 */
1709
1710 adapter->net_stats.rx_crc_errors = adapter->stats.crcerrs;
1711 adapter->net_stats.rx_fifo_errors = adapter->stats.mpc;
1712 adapter->net_stats.rx_missed_errors = adapter->stats.mpc;
1713 adapter->net_stats.rx_over_errors = adapter->stats.mpc;
1714
1715 adapter->net_stats.tx_errors = 0;
1716 adapter->net_stats.rx_frame_errors = 0;
1717 adapter->net_stats.tx_aborted_errors = 0;
1718 adapter->net_stats.tx_carrier_errors = 0;
1719 adapter->net_stats.tx_fifo_errors = 0;
1720 adapter->net_stats.tx_heartbeat_errors = 0;
1721 adapter->net_stats.tx_window_errors = 0;
1722 }
1723
1724 #define IXGB_MAX_INTR 10
1725 /**
1726 * ixgb_intr - Interrupt Handler
1727 * @irq: interrupt number
1728 * @data: pointer to a network interface device structure
1729 **/
1730
1731 static irqreturn_t
1732 ixgb_intr(int irq, void *data)
1733 {
1734 struct net_device *netdev = data;
1735 struct ixgb_adapter *adapter = netdev_priv(netdev);
1736 struct ixgb_hw *hw = &adapter->hw;
1737 u32 icr = IXGB_READ_REG(hw, ICR);
1738 #ifndef CONFIG_IXGB_NAPI
1739 unsigned int i;
1740 #endif
1741
1742 if(unlikely(!icr))
1743 return IRQ_NONE; /* Not our interrupt */
1744
1745 if (unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC)))
1746 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1747 mod_timer(&adapter->watchdog_timer, jiffies);
1748
1749 #ifdef CONFIG_IXGB_NAPI
1750 if (netif_rx_schedule_prep(netdev, &adapter->napi)) {
1751
1752 /* Disable interrupts and register for poll. The flush
1753 of the posted write is intentionally left out.
1754 */
1755
1756 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1757 __netif_rx_schedule(netdev, &adapter->napi);
1758 }
1759 #else
1760 /* yes, that is actually a & and it is meant to make sure that
1761 * every pass through this for loop checks both receive and
1762 * transmit queues for completed descriptors, intended to
1763 * avoid starvation issues and assist tx/rx fairness. */
1764 for(i = 0; i < IXGB_MAX_INTR; i++)
1765 if(!ixgb_clean_rx_irq(adapter) &
1766 !ixgb_clean_tx_irq(adapter))
1767 break;
1768 #endif
1769 return IRQ_HANDLED;
1770 }
1771
1772 #ifdef CONFIG_IXGB_NAPI
1773 /**
1774 * ixgb_clean - NAPI Rx polling callback
1775 * @adapter: board private structure
1776 **/
1777
1778 static int
1779 ixgb_clean(struct napi_struct *napi, int budget)
1780 {
1781 struct ixgb_adapter *adapter = container_of(napi, struct ixgb_adapter, napi);
1782 struct net_device *netdev = adapter->netdev;
1783 int work_done = 0;
1784
1785 ixgb_clean_tx_irq(adapter);
1786 ixgb_clean_rx_irq(adapter, &work_done, budget);
1787
1788 /* If budget not fully consumed, exit the polling mode */
1789 if (work_done < budget) {
1790 netif_rx_complete(netdev, napi);
1791 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1792 ixgb_irq_enable(adapter);
1793 }
1794
1795 return work_done;
1796 }
1797 #endif
1798
1799 /**
1800 * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1801 * @adapter: board private structure
1802 **/
1803
1804 static bool
1805 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1806 {
1807 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1808 struct net_device *netdev = adapter->netdev;
1809 struct ixgb_tx_desc *tx_desc, *eop_desc;
1810 struct ixgb_buffer *buffer_info;
1811 unsigned int i, eop;
1812 bool cleaned = false;
1813
1814 i = tx_ring->next_to_clean;
1815 eop = tx_ring->buffer_info[i].next_to_watch;
1816 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1817
1818 while(eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1819
1820 for (cleaned = false; !cleaned; ) {
1821 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1822 buffer_info = &tx_ring->buffer_info[i];
1823
1824 if (tx_desc->popts
1825 & (IXGB_TX_DESC_POPTS_TXSM |
1826 IXGB_TX_DESC_POPTS_IXSM))
1827 adapter->hw_csum_tx_good++;
1828
1829 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1830
1831 *(u32 *)&(tx_desc->status) = 0;
1832
1833 cleaned = (i == eop);
1834 if(++i == tx_ring->count) i = 0;
1835 }
1836
1837 eop = tx_ring->buffer_info[i].next_to_watch;
1838 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1839 }
1840
1841 tx_ring->next_to_clean = i;
1842
1843 if (unlikely(cleaned && netif_carrier_ok(netdev) &&
1844 IXGB_DESC_UNUSED(tx_ring) >= DESC_NEEDED)) {
1845 /* Make sure that anybody stopping the queue after this
1846 * sees the new next_to_clean. */
1847 smp_mb();
1848
1849 if (netif_queue_stopped(netdev) &&
1850 !(test_bit(__IXGB_DOWN, &adapter->flags))) {
1851 netif_wake_queue(netdev);
1852 ++adapter->restart_queue;
1853 }
1854 }
1855
1856 if(adapter->detect_tx_hung) {
1857 /* detect a transmit hang in hardware, this serializes the
1858 * check with the clearing of time_stamp and movement of i */
1859 adapter->detect_tx_hung = false;
1860 if (tx_ring->buffer_info[eop].dma &&
1861 time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ)
1862 && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1863 IXGB_STATUS_TXOFF)) {
1864 /* detected Tx unit hang */
1865 DPRINTK(DRV, ERR, "Detected Tx Unit Hang\n"
1866 " TDH <%x>\n"
1867 " TDT <%x>\n"
1868 " next_to_use <%x>\n"
1869 " next_to_clean <%x>\n"
1870 "buffer_info[next_to_clean]\n"
1871 " time_stamp <%lx>\n"
1872 " next_to_watch <%x>\n"
1873 " jiffies <%lx>\n"
1874 " next_to_watch.status <%x>\n",
1875 IXGB_READ_REG(&adapter->hw, TDH),
1876 IXGB_READ_REG(&adapter->hw, TDT),
1877 tx_ring->next_to_use,
1878 tx_ring->next_to_clean,
1879 tx_ring->buffer_info[eop].time_stamp,
1880 eop,
1881 jiffies,
1882 eop_desc->status);
1883 netif_stop_queue(netdev);
1884 }
1885 }
1886
1887 return cleaned;
1888 }
1889
1890 /**
1891 * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1892 * @adapter: board private structure
1893 * @rx_desc: receive descriptor
1894 * @sk_buff: socket buffer with received data
1895 **/
1896
1897 static void
1898 ixgb_rx_checksum(struct ixgb_adapter *adapter,
1899 struct ixgb_rx_desc *rx_desc,
1900 struct sk_buff *skb)
1901 {
1902 /* Ignore Checksum bit is set OR
1903 * TCP Checksum has not been calculated
1904 */
1905 if((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1906 (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1907 skb->ip_summed = CHECKSUM_NONE;
1908 return;
1909 }
1910
1911 /* At this point we know the hardware did the TCP checksum */
1912 /* now look at the TCP checksum error bit */
1913 if(rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1914 /* let the stack verify checksum errors */
1915 skb->ip_summed = CHECKSUM_NONE;
1916 adapter->hw_csum_rx_error++;
1917 } else {
1918 /* TCP checksum is good */
1919 skb->ip_summed = CHECKSUM_UNNECESSARY;
1920 adapter->hw_csum_rx_good++;
1921 }
1922 }
1923
1924 /**
1925 * ixgb_clean_rx_irq - Send received data up the network stack,
1926 * @adapter: board private structure
1927 **/
1928
1929 static bool
1930 #ifdef CONFIG_IXGB_NAPI
1931 ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
1932 #else
1933 ixgb_clean_rx_irq(struct ixgb_adapter *adapter)
1934 #endif
1935 {
1936 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1937 struct net_device *netdev = adapter->netdev;
1938 struct pci_dev *pdev = adapter->pdev;
1939 struct ixgb_rx_desc *rx_desc, *next_rxd;
1940 struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
1941 u32 length;
1942 unsigned int i, j;
1943 bool cleaned = false;
1944
1945 i = rx_ring->next_to_clean;
1946 rx_desc = IXGB_RX_DESC(*rx_ring, i);
1947 buffer_info = &rx_ring->buffer_info[i];
1948
1949 while(rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
1950 struct sk_buff *skb, *next_skb;
1951 u8 status;
1952
1953 #ifdef CONFIG_IXGB_NAPI
1954 if(*work_done >= work_to_do)
1955 break;
1956
1957 (*work_done)++;
1958 #endif
1959 status = rx_desc->status;
1960 skb = buffer_info->skb;
1961 buffer_info->skb = NULL;
1962
1963 prefetch(skb->data);
1964
1965 if(++i == rx_ring->count) i = 0;
1966 next_rxd = IXGB_RX_DESC(*rx_ring, i);
1967 prefetch(next_rxd);
1968
1969 if((j = i + 1) == rx_ring->count) j = 0;
1970 next2_buffer = &rx_ring->buffer_info[j];
1971 prefetch(next2_buffer);
1972
1973 next_buffer = &rx_ring->buffer_info[i];
1974 next_skb = next_buffer->skb;
1975 prefetch(next_skb);
1976
1977 cleaned = true;
1978
1979 pci_unmap_single(pdev,
1980 buffer_info->dma,
1981 buffer_info->length,
1982 PCI_DMA_FROMDEVICE);
1983
1984 length = le16_to_cpu(rx_desc->length);
1985
1986 if(unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
1987
1988 /* All receives must fit into a single buffer */
1989
1990 IXGB_DBG("Receive packet consumed multiple buffers "
1991 "length<%x>\n", length);
1992
1993 dev_kfree_skb_irq(skb);
1994 goto rxdesc_done;
1995 }
1996
1997 if (unlikely(rx_desc->errors
1998 & (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE
1999 | IXGB_RX_DESC_ERRORS_P |
2000 IXGB_RX_DESC_ERRORS_RXE))) {
2001
2002 dev_kfree_skb_irq(skb);
2003 goto rxdesc_done;
2004 }
2005
2006 /* code added for copybreak, this should improve
2007 * performance for small packets with large amounts
2008 * of reassembly being done in the stack */
2009 #define IXGB_CB_LENGTH 256
2010 if (length < IXGB_CB_LENGTH) {
2011 struct sk_buff *new_skb =
2012 netdev_alloc_skb(netdev, length + NET_IP_ALIGN);
2013 if (new_skb) {
2014 skb_reserve(new_skb, NET_IP_ALIGN);
2015 skb_copy_to_linear_data_offset(new_skb,
2016 -NET_IP_ALIGN,
2017 (skb->data -
2018 NET_IP_ALIGN),
2019 (length +
2020 NET_IP_ALIGN));
2021 /* save the skb in buffer_info as good */
2022 buffer_info->skb = skb;
2023 skb = new_skb;
2024 }
2025 }
2026 /* end copybreak code */
2027
2028 /* Good Receive */
2029 skb_put(skb, length);
2030
2031 /* Receive Checksum Offload */
2032 ixgb_rx_checksum(adapter, rx_desc, skb);
2033
2034 skb->protocol = eth_type_trans(skb, netdev);
2035 #ifdef CONFIG_IXGB_NAPI
2036 if(adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
2037 vlan_hwaccel_receive_skb(skb, adapter->vlgrp,
2038 le16_to_cpu(rx_desc->special));
2039 } else {
2040 netif_receive_skb(skb);
2041 }
2042 #else /* CONFIG_IXGB_NAPI */
2043 if(adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
2044 vlan_hwaccel_rx(skb, adapter->vlgrp,
2045 le16_to_cpu(rx_desc->special));
2046 } else {
2047 netif_rx(skb);
2048 }
2049 #endif /* CONFIG_IXGB_NAPI */
2050 netdev->last_rx = jiffies;
2051
2052 rxdesc_done:
2053 /* clean up descriptor, might be written over by hw */
2054 rx_desc->status = 0;
2055
2056 /* use prefetched values */
2057 rx_desc = next_rxd;
2058 buffer_info = next_buffer;
2059 }
2060
2061 rx_ring->next_to_clean = i;
2062
2063 ixgb_alloc_rx_buffers(adapter);
2064
2065 return cleaned;
2066 }
2067
2068 /**
2069 * ixgb_alloc_rx_buffers - Replace used receive buffers
2070 * @adapter: address of board private structure
2071 **/
2072
2073 static void
2074 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter)
2075 {
2076 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2077 struct net_device *netdev = adapter->netdev;
2078 struct pci_dev *pdev = adapter->pdev;
2079 struct ixgb_rx_desc *rx_desc;
2080 struct ixgb_buffer *buffer_info;
2081 struct sk_buff *skb;
2082 unsigned int i;
2083 long cleancount;
2084
2085 i = rx_ring->next_to_use;
2086 buffer_info = &rx_ring->buffer_info[i];
2087 cleancount = IXGB_DESC_UNUSED(rx_ring);
2088
2089
2090 /* leave three descriptors unused */
2091 while(--cleancount > 2) {
2092 /* recycle! its good for you */
2093 skb = buffer_info->skb;
2094 if (skb) {
2095 skb_trim(skb, 0);
2096 goto map_skb;
2097 }
2098
2099 skb = netdev_alloc_skb(netdev, adapter->rx_buffer_len
2100 + NET_IP_ALIGN);
2101 if (unlikely(!skb)) {
2102 /* Better luck next round */
2103 adapter->alloc_rx_buff_failed++;
2104 break;
2105 }
2106
2107 /* Make buffer alignment 2 beyond a 16 byte boundary
2108 * this will result in a 16 byte aligned IP header after
2109 * the 14 byte MAC header is removed
2110 */
2111 skb_reserve(skb, NET_IP_ALIGN);
2112
2113 buffer_info->skb = skb;
2114 buffer_info->length = adapter->rx_buffer_len;
2115 map_skb:
2116 buffer_info->dma = pci_map_single(pdev,
2117 skb->data,
2118 adapter->rx_buffer_len,
2119 PCI_DMA_FROMDEVICE);
2120
2121 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2122 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
2123 /* guarantee DD bit not set now before h/w gets descriptor
2124 * this is the rest of the workaround for h/w double
2125 * writeback. */
2126 rx_desc->status = 0;
2127
2128
2129 if(++i == rx_ring->count) i = 0;
2130 buffer_info = &rx_ring->buffer_info[i];
2131 }
2132
2133 if (likely(rx_ring->next_to_use != i)) {
2134 rx_ring->next_to_use = i;
2135 if (unlikely(i-- == 0))
2136 i = (rx_ring->count - 1);
2137
2138 /* Force memory writes to complete before letting h/w
2139 * know there are new descriptors to fetch. (Only
2140 * applicable for weak-ordered memory model archs, such
2141 * as IA-64). */
2142 wmb();
2143 IXGB_WRITE_REG(&adapter->hw, RDT, i);
2144 }
2145 }
2146
2147 /**
2148 * ixgb_vlan_rx_register - enables or disables vlan tagging/stripping.
2149 *
2150 * @param netdev network interface device structure
2151 * @param grp indicates to enable or disable tagging/stripping
2152 **/
2153 static void
2154 ixgb_vlan_rx_register(struct net_device *netdev, struct vlan_group *grp)
2155 {
2156 struct ixgb_adapter *adapter = netdev_priv(netdev);
2157 u32 ctrl, rctl;
2158
2159 ixgb_irq_disable(adapter);
2160 adapter->vlgrp = grp;
2161
2162 if(grp) {
2163 /* enable VLAN tag insert/strip */
2164 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2165 ctrl |= IXGB_CTRL0_VME;
2166 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2167
2168 /* enable VLAN receive filtering */
2169
2170 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2171 rctl |= IXGB_RCTL_VFE;
2172 rctl &= ~IXGB_RCTL_CFIEN;
2173 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2174 } else {
2175 /* disable VLAN tag insert/strip */
2176
2177 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2178 ctrl &= ~IXGB_CTRL0_VME;
2179 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2180
2181 /* disable VLAN filtering */
2182
2183 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2184 rctl &= ~IXGB_RCTL_VFE;
2185 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2186 }
2187
2188 /* don't enable interrupts unless we are UP */
2189 if (adapter->netdev->flags & IFF_UP)
2190 ixgb_irq_enable(adapter);
2191 }
2192
2193 static void
2194 ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid)
2195 {
2196 struct ixgb_adapter *adapter = netdev_priv(netdev);
2197 u32 vfta, index;
2198
2199 /* add VID to filter table */
2200
2201 index = (vid >> 5) & 0x7F;
2202 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2203 vfta |= (1 << (vid & 0x1F));
2204 ixgb_write_vfta(&adapter->hw, index, vfta);
2205 }
2206
2207 static void
2208 ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid)
2209 {
2210 struct ixgb_adapter *adapter = netdev_priv(netdev);
2211 u32 vfta, index;
2212
2213 ixgb_irq_disable(adapter);
2214
2215 vlan_group_set_device(adapter->vlgrp, vid, NULL);
2216
2217 /* don't enable interrupts unless we are UP */
2218 if (adapter->netdev->flags & IFF_UP)
2219 ixgb_irq_enable(adapter);
2220
2221 /* remove VID from filter table */
2222
2223 index = (vid >> 5) & 0x7F;
2224 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2225 vfta &= ~(1 << (vid & 0x1F));
2226 ixgb_write_vfta(&adapter->hw, index, vfta);
2227 }
2228
2229 static void
2230 ixgb_restore_vlan(struct ixgb_adapter *adapter)
2231 {
2232 ixgb_vlan_rx_register(adapter->netdev, adapter->vlgrp);
2233
2234 if(adapter->vlgrp) {
2235 u16 vid;
2236 for(vid = 0; vid < VLAN_GROUP_ARRAY_LEN; vid++) {
2237 if(!vlan_group_get_device(adapter->vlgrp, vid))
2238 continue;
2239 ixgb_vlan_rx_add_vid(adapter->netdev, vid);
2240 }
2241 }
2242 }
2243
2244 #ifdef CONFIG_NET_POLL_CONTROLLER
2245 /*
2246 * Polling 'interrupt' - used by things like netconsole to send skbs
2247 * without having to re-enable interrupts. It's not called while
2248 * the interrupt routine is executing.
2249 */
2250
2251 static void ixgb_netpoll(struct net_device *dev)
2252 {
2253 struct ixgb_adapter *adapter = netdev_priv(dev);
2254
2255 disable_irq(adapter->pdev->irq);
2256 ixgb_intr(adapter->pdev->irq, dev);
2257 enable_irq(adapter->pdev->irq);
2258 }
2259 #endif
2260
2261 /**
2262 * ixgb_io_error_detected() - called when PCI error is detected
2263 * @pdev pointer to pci device with error
2264 * @state pci channel state after error
2265 *
2266 * This callback is called by the PCI subsystem whenever
2267 * a PCI bus error is detected.
2268 */
2269 static pci_ers_result_t ixgb_io_error_detected (struct pci_dev *pdev,
2270 enum pci_channel_state state)
2271 {
2272 struct net_device *netdev = pci_get_drvdata(pdev);
2273 struct ixgb_adapter *adapter = netdev_priv(netdev);
2274
2275 if(netif_running(netdev))
2276 ixgb_down(adapter, true);
2277
2278 pci_disable_device(pdev);
2279
2280 /* Request a slot reset. */
2281 return PCI_ERS_RESULT_NEED_RESET;
2282 }
2283
2284 /**
2285 * ixgb_io_slot_reset - called after the pci bus has been reset.
2286 * @pdev pointer to pci device with error
2287 *
2288 * This callback is called after the PCI buss has been reset.
2289 * Basically, this tries to restart the card from scratch.
2290 * This is a shortened version of the device probe/discovery code,
2291 * it resembles the first-half of the ixgb_probe() routine.
2292 */
2293 static pci_ers_result_t ixgb_io_slot_reset (struct pci_dev *pdev)
2294 {
2295 struct net_device *netdev = pci_get_drvdata(pdev);
2296 struct ixgb_adapter *adapter = netdev_priv(netdev);
2297
2298 if(pci_enable_device(pdev)) {
2299 DPRINTK(PROBE, ERR, "Cannot re-enable PCI device after reset.\n");
2300 return PCI_ERS_RESULT_DISCONNECT;
2301 }
2302
2303 /* Perform card reset only on one instance of the card */
2304 if (0 != PCI_FUNC (pdev->devfn))
2305 return PCI_ERS_RESULT_RECOVERED;
2306
2307 pci_set_master(pdev);
2308
2309 netif_carrier_off(netdev);
2310 netif_stop_queue(netdev);
2311 ixgb_reset(adapter);
2312
2313 /* Make sure the EEPROM is good */
2314 if(!ixgb_validate_eeprom_checksum(&adapter->hw)) {
2315 DPRINTK(PROBE, ERR, "After reset, the EEPROM checksum is not valid.\n");
2316 return PCI_ERS_RESULT_DISCONNECT;
2317 }
2318 ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
2319 memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
2320
2321 if(!is_valid_ether_addr(netdev->perm_addr)) {
2322 DPRINTK(PROBE, ERR, "After reset, invalid MAC address.\n");
2323 return PCI_ERS_RESULT_DISCONNECT;
2324 }
2325
2326 return PCI_ERS_RESULT_RECOVERED;
2327 }
2328
2329 /**
2330 * ixgb_io_resume - called when its OK to resume normal operations
2331 * @pdev pointer to pci device with error
2332 *
2333 * The error recovery driver tells us that its OK to resume
2334 * normal operation. Implementation resembles the second-half
2335 * of the ixgb_probe() routine.
2336 */
2337 static void ixgb_io_resume (struct pci_dev *pdev)
2338 {
2339 struct net_device *netdev = pci_get_drvdata(pdev);
2340 struct ixgb_adapter *adapter = netdev_priv(netdev);
2341
2342 pci_set_master(pdev);
2343
2344 if(netif_running(netdev)) {
2345 if(ixgb_up(adapter)) {
2346 printk ("ixgb: can't bring device back up after reset\n");
2347 return;
2348 }
2349 }
2350
2351 netif_device_attach(netdev);
2352 mod_timer(&adapter->watchdog_timer, jiffies);
2353 }
2354
2355 /* ixgb_main.c */
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree