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gpio: rcar: Fix runtime PM imbalance on error
[linux/fpc-iii.git] / drivers / net / ethernet / intel / ixgb / ixgb_main.c
blobb64e91ea3465d52ee490e5e1691313674b517af5
1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright(c) 1999 - 2008 Intel Corporation. */
3
4 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
5
6 #include <linux/prefetch.h>
7 #include "ixgb.h"
8
9 char ixgb_driver_name[] = "ixgb";
10 static char ixgb_driver_string[] = "Intel(R) PRO/10GbE Network Driver";
11
12 #define DRIVERNAPI "-NAPI"
13 #define DRV_VERSION "1.0.135-k2" DRIVERNAPI
14 const char ixgb_driver_version[] = DRV_VERSION;
15 static const char ixgb_copyright[] = "Copyright (c) 1999-2008 Intel Corporation.";
16
17 #define IXGB_CB_LENGTH 256
18 static unsigned int copybreak __read_mostly = IXGB_CB_LENGTH;
19 module_param(copybreak, uint, 0644);
20 MODULE_PARM_DESC(copybreak,
21 "Maximum size of packet that is copied to a new buffer on receive");
22
23 /* ixgb_pci_tbl - PCI Device ID Table
24 *
25 * Wildcard entries (PCI_ANY_ID) should come last
26 * Last entry must be all 0s
27 *
28 * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
29 * Class, Class Mask, private data (not used) }
30 */
31 static const struct pci_device_id ixgb_pci_tbl[] = {
32 {PCI_VENDOR_ID_INTEL, IXGB_DEVICE_ID_82597EX,
33 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
34 {PCI_VENDOR_ID_INTEL, IXGB_DEVICE_ID_82597EX_CX4,
35 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
36 {PCI_VENDOR_ID_INTEL, IXGB_DEVICE_ID_82597EX_SR,
37 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
38 {PCI_VENDOR_ID_INTEL, IXGB_DEVICE_ID_82597EX_LR,
39 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
40
41 /* required last entry */
42 {0,}
43 };
44
45 MODULE_DEVICE_TABLE(pci, ixgb_pci_tbl);
46
47 /* Local Function Prototypes */
48 static int ixgb_init_module(void);
49 static void ixgb_exit_module(void);
50 static int ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
51 static void ixgb_remove(struct pci_dev *pdev);
52 static int ixgb_sw_init(struct ixgb_adapter *adapter);
53 static int ixgb_open(struct net_device *netdev);
54 static int ixgb_close(struct net_device *netdev);
55 static void ixgb_configure_tx(struct ixgb_adapter *adapter);
56 static void ixgb_configure_rx(struct ixgb_adapter *adapter);
57 static void ixgb_setup_rctl(struct ixgb_adapter *adapter);
58 static void ixgb_clean_tx_ring(struct ixgb_adapter *adapter);
59 static void ixgb_clean_rx_ring(struct ixgb_adapter *adapter);
60 static void ixgb_set_multi(struct net_device *netdev);
61 static void ixgb_watchdog(struct timer_list *t);
62 static netdev_tx_t ixgb_xmit_frame(struct sk_buff *skb,
63 struct net_device *netdev);
64 static int ixgb_change_mtu(struct net_device *netdev, int new_mtu);
65 static int ixgb_set_mac(struct net_device *netdev, void *p);
66 static irqreturn_t ixgb_intr(int irq, void *data);
67 static bool ixgb_clean_tx_irq(struct ixgb_adapter *adapter);
68
69 static int ixgb_clean(struct napi_struct *, int);
70 static bool ixgb_clean_rx_irq(struct ixgb_adapter *, int *, int);
71 static void ixgb_alloc_rx_buffers(struct ixgb_adapter *, int);
72
73 static void ixgb_tx_timeout(struct net_device *dev, unsigned int txqueue);
74 static void ixgb_tx_timeout_task(struct work_struct *work);
75
76 static void ixgb_vlan_strip_enable(struct ixgb_adapter *adapter);
77 static void ixgb_vlan_strip_disable(struct ixgb_adapter *adapter);
78 static int ixgb_vlan_rx_add_vid(struct net_device *netdev,
79 __be16 proto, u16 vid);
80 static int ixgb_vlan_rx_kill_vid(struct net_device *netdev,
81 __be16 proto, u16 vid);
82 static void ixgb_restore_vlan(struct ixgb_adapter *adapter);
83
84 static pci_ers_result_t ixgb_io_error_detected (struct pci_dev *pdev,
85 enum pci_channel_state state);
86 static pci_ers_result_t ixgb_io_slot_reset (struct pci_dev *pdev);
87 static void ixgb_io_resume (struct pci_dev *pdev);
88
89 static const struct pci_error_handlers ixgb_err_handler = {
90 .error_detected = ixgb_io_error_detected,
91 .slot_reset = ixgb_io_slot_reset,
92 .resume = ixgb_io_resume,
93 };
94
95 static struct pci_driver ixgb_driver = {
96 .name = ixgb_driver_name,
97 .id_table = ixgb_pci_tbl,
98 .probe = ixgb_probe,
99 .remove = ixgb_remove,
100 .err_handler = &ixgb_err_handler
101 };
102
103 MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
104 MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver");
105 MODULE_LICENSE("GPL v2");
106 MODULE_VERSION(DRV_VERSION);
107
108 #define DEFAULT_MSG_ENABLE (NETIF_MSG_DRV|NETIF_MSG_PROBE|NETIF_MSG_LINK)
109 static int debug = -1;
110 module_param(debug, int, 0);
111 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
112
113 /**
114 * ixgb_init_module - Driver Registration Routine
115 *
116 * ixgb_init_module is the first routine called when the driver is
117 * loaded. All it does is register with the PCI subsystem.
118 **/
119
120 static int __init
121 ixgb_init_module(void)
122 {
123 pr_info("%s - version %s\n", ixgb_driver_string, ixgb_driver_version);
124 pr_info("%s\n", ixgb_copyright);
125
126 return pci_register_driver(&ixgb_driver);
127 }
128
129 module_init(ixgb_init_module);
130
131 /**
132 * ixgb_exit_module - Driver Exit Cleanup Routine
133 *
134 * ixgb_exit_module is called just before the driver is removed
135 * from memory.
136 **/
137
138 static void __exit
139 ixgb_exit_module(void)
140 {
141 pci_unregister_driver(&ixgb_driver);
142 }
143
144 module_exit(ixgb_exit_module);
145
146 /**
147 * ixgb_irq_disable - Mask off interrupt generation on the NIC
148 * @adapter: board private structure
149 **/
150
151 static void
152 ixgb_irq_disable(struct ixgb_adapter *adapter)
153 {
154 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
155 IXGB_WRITE_FLUSH(&adapter->hw);
156 synchronize_irq(adapter->pdev->irq);
157 }
158
159 /**
160 * ixgb_irq_enable - Enable default interrupt generation settings
161 * @adapter: board private structure
162 **/
163
164 static void
165 ixgb_irq_enable(struct ixgb_adapter *adapter)
166 {
167 u32 val = IXGB_INT_RXT0 | IXGB_INT_RXDMT0 |
168 IXGB_INT_TXDW | IXGB_INT_LSC;
169 if (adapter->hw.subsystem_vendor_id == PCI_VENDOR_ID_SUN)
170 val |= IXGB_INT_GPI0;
171 IXGB_WRITE_REG(&adapter->hw, IMS, val);
172 IXGB_WRITE_FLUSH(&adapter->hw);
173 }
174
175 int
176 ixgb_up(struct ixgb_adapter *adapter)
177 {
178 struct net_device *netdev = adapter->netdev;
179 int err, irq_flags = IRQF_SHARED;
180 int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
181 struct ixgb_hw *hw = &adapter->hw;
182
183 /* hardware has been reset, we need to reload some things */
184
185 ixgb_rar_set(hw, netdev->dev_addr, 0);
186 ixgb_set_multi(netdev);
187
188 ixgb_restore_vlan(adapter);
189
190 ixgb_configure_tx(adapter);
191 ixgb_setup_rctl(adapter);
192 ixgb_configure_rx(adapter);
193 ixgb_alloc_rx_buffers(adapter, IXGB_DESC_UNUSED(&adapter->rx_ring));
194
195 /* disable interrupts and get the hardware into a known state */
196 IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);
197
198 /* only enable MSI if bus is in PCI-X mode */
199 if (IXGB_READ_REG(&adapter->hw, STATUS) & IXGB_STATUS_PCIX_MODE) {
200 err = pci_enable_msi(adapter->pdev);
201 if (!err) {
202 adapter->have_msi = true;
203 irq_flags = 0;
204 }
205 /* proceed to try to request regular interrupt */
206 }
207
208 err = request_irq(adapter->pdev->irq, ixgb_intr, irq_flags,
209 netdev->name, netdev);
210 if (err) {
211 if (adapter->have_msi)
212 pci_disable_msi(adapter->pdev);
213 netif_err(adapter, probe, adapter->netdev,
214 "Unable to allocate interrupt Error: %d\n", err);
215 return err;
216 }
217
218 if ((hw->max_frame_size != max_frame) ||
219 (hw->max_frame_size !=
220 (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {
221
222 hw->max_frame_size = max_frame;
223
224 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
225
226 if (hw->max_frame_size >
227 IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
228 u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
229
230 if (!(ctrl0 & IXGB_CTRL0_JFE)) {
231 ctrl0 |= IXGB_CTRL0_JFE;
232 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
233 }
234 }
235 }
236
237 clear_bit(__IXGB_DOWN, &adapter->flags);
238
239 napi_enable(&adapter->napi);
240 ixgb_irq_enable(adapter);
241
242 netif_wake_queue(netdev);
243
244 mod_timer(&adapter->watchdog_timer, jiffies);
245
246 return 0;
247 }
248
249 void
250 ixgb_down(struct ixgb_adapter *adapter, bool kill_watchdog)
251 {
252 struct net_device *netdev = adapter->netdev;
253
254 /* prevent the interrupt handler from restarting watchdog */
255 set_bit(__IXGB_DOWN, &adapter->flags);
256
257 netif_carrier_off(netdev);
258
259 napi_disable(&adapter->napi);
260 /* waiting for NAPI to complete can re-enable interrupts */
261 ixgb_irq_disable(adapter);
262 free_irq(adapter->pdev->irq, netdev);
263
264 if (adapter->have_msi)
265 pci_disable_msi(adapter->pdev);
266
267 if (kill_watchdog)
268 del_timer_sync(&adapter->watchdog_timer);
269
270 adapter->link_speed = 0;
271 adapter->link_duplex = 0;
272 netif_stop_queue(netdev);
273
274 ixgb_reset(adapter);
275 ixgb_clean_tx_ring(adapter);
276 ixgb_clean_rx_ring(adapter);
277 }
278
279 void
280 ixgb_reset(struct ixgb_adapter *adapter)
281 {
282 struct ixgb_hw *hw = &adapter->hw;
283
284 ixgb_adapter_stop(hw);
285 if (!ixgb_init_hw(hw))
286 netif_err(adapter, probe, adapter->netdev, "ixgb_init_hw failed\n");
287
288 /* restore frame size information */
289 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
290 if (hw->max_frame_size >
291 IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
292 u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
293 if (!(ctrl0 & IXGB_CTRL0_JFE)) {
294 ctrl0 |= IXGB_CTRL0_JFE;
295 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
296 }
297 }
298 }
299
300 static netdev_features_t
301 ixgb_fix_features(struct net_device *netdev, netdev_features_t features)
302 {
303 /*
304 * Tx VLAN insertion does not work per HW design when Rx stripping is
305 * disabled.
306 */
307 if (!(features & NETIF_F_HW_VLAN_CTAG_RX))
308 features &= ~NETIF_F_HW_VLAN_CTAG_TX;
309
310 return features;
311 }
312
313 static int
314 ixgb_set_features(struct net_device *netdev, netdev_features_t features)
315 {
316 struct ixgb_adapter *adapter = netdev_priv(netdev);
317 netdev_features_t changed = features ^ netdev->features;
318
319 if (!(changed & (NETIF_F_RXCSUM|NETIF_F_HW_VLAN_CTAG_RX)))
320 return 0;
321
322 adapter->rx_csum = !!(features & NETIF_F_RXCSUM);
323
324 if (netif_running(netdev)) {
325 ixgb_down(adapter, true);
326 ixgb_up(adapter);
327 ixgb_set_speed_duplex(netdev);
328 } else
329 ixgb_reset(adapter);
330
331 return 0;
332 }
333
334
335 static const struct net_device_ops ixgb_netdev_ops = {
336 .ndo_open = ixgb_open,
337 .ndo_stop = ixgb_close,
338 .ndo_start_xmit = ixgb_xmit_frame,
339 .ndo_set_rx_mode = ixgb_set_multi,
340 .ndo_validate_addr = eth_validate_addr,
341 .ndo_set_mac_address = ixgb_set_mac,
342 .ndo_change_mtu = ixgb_change_mtu,
343 .ndo_tx_timeout = ixgb_tx_timeout,
344 .ndo_vlan_rx_add_vid = ixgb_vlan_rx_add_vid,
345 .ndo_vlan_rx_kill_vid = ixgb_vlan_rx_kill_vid,
346 .ndo_fix_features = ixgb_fix_features,
347 .ndo_set_features = ixgb_set_features,
348 };
349
350 /**
351 * ixgb_probe - Device Initialization Routine
352 * @pdev: PCI device information struct
353 * @ent: entry in ixgb_pci_tbl
354 *
355 * Returns 0 on success, negative on failure
356 *
357 * ixgb_probe initializes an adapter identified by a pci_dev structure.
358 * The OS initialization, configuring of the adapter private structure,
359 * and a hardware reset occur.
360 **/
361
362 static int
363 ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
364 {
365 struct net_device *netdev = NULL;
366 struct ixgb_adapter *adapter;
367 static int cards_found = 0;
368 int pci_using_dac;
369 int i;
370 int err;
371
372 err = pci_enable_device(pdev);
373 if (err)
374 return err;
375
376 pci_using_dac = 0;
377 err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
378 if (!err) {
379 pci_using_dac = 1;
380 } else {
381 err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
382 if (err) {
383 pr_err("No usable DMA configuration, aborting\n");
384 goto err_dma_mask;
385 }
386 }
387
388 err = pci_request_regions(pdev, ixgb_driver_name);
389 if (err)
390 goto err_request_regions;
391
392 pci_set_master(pdev);
393
394 netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
395 if (!netdev) {
396 err = -ENOMEM;
397 goto err_alloc_etherdev;
398 }
399
400 SET_NETDEV_DEV(netdev, &pdev->dev);
401
402 pci_set_drvdata(pdev, netdev);
403 adapter = netdev_priv(netdev);
404 adapter->netdev = netdev;
405 adapter->pdev = pdev;
406 adapter->hw.back = adapter;
407 adapter->msg_enable = netif_msg_init(debug, DEFAULT_MSG_ENABLE);
408
409 adapter->hw.hw_addr = pci_ioremap_bar(pdev, BAR_0);
410 if (!adapter->hw.hw_addr) {
411 err = -EIO;
412 goto err_ioremap;
413 }
414
415 for (i = BAR_1; i < PCI_STD_NUM_BARS; i++) {
416 if (pci_resource_len(pdev, i) == 0)
417 continue;
418 if (pci_resource_flags(pdev, i) & IORESOURCE_IO) {
419 adapter->hw.io_base = pci_resource_start(pdev, i);
420 break;
421 }
422 }
423
424 netdev->netdev_ops = &ixgb_netdev_ops;
425 ixgb_set_ethtool_ops(netdev);
426 netdev->watchdog_timeo = 5 * HZ;
427 netif_napi_add(netdev, &adapter->napi, ixgb_clean, 64);
428
429 strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
430
431 adapter->bd_number = cards_found;
432 adapter->link_speed = 0;
433 adapter->link_duplex = 0;
434
435 /* setup the private structure */
436
437 err = ixgb_sw_init(adapter);
438 if (err)
439 goto err_sw_init;
440
441 netdev->hw_features = NETIF_F_SG |
442 NETIF_F_TSO |
443 NETIF_F_HW_CSUM |
444 NETIF_F_HW_VLAN_CTAG_TX |
445 NETIF_F_HW_VLAN_CTAG_RX;
446 netdev->features = netdev->hw_features |
447 NETIF_F_HW_VLAN_CTAG_FILTER;
448 netdev->hw_features |= NETIF_F_RXCSUM;
449
450 if (pci_using_dac) {
451 netdev->features |= NETIF_F_HIGHDMA;
452 netdev->vlan_features |= NETIF_F_HIGHDMA;
453 }
454
455 /* MTU range: 68 - 16114 */
456 netdev->min_mtu = ETH_MIN_MTU;
457 netdev->max_mtu = IXGB_MAX_JUMBO_FRAME_SIZE - ETH_HLEN;
458
459 /* make sure the EEPROM is good */
460
461 if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
462 netif_err(adapter, probe, adapter->netdev,
463 "The EEPROM Checksum Is Not Valid\n");
464 err = -EIO;
465 goto err_eeprom;
466 }
467
468 ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
469
470 if (!is_valid_ether_addr(netdev->dev_addr)) {
471 netif_err(adapter, probe, adapter->netdev, "Invalid MAC Address\n");
472 err = -EIO;
473 goto err_eeprom;
474 }
475
476 adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
477
478 timer_setup(&adapter->watchdog_timer, ixgb_watchdog, 0);
479
480 INIT_WORK(&adapter->tx_timeout_task, ixgb_tx_timeout_task);
481
482 strcpy(netdev->name, "eth%d");
483 err = register_netdev(netdev);
484 if (err)
485 goto err_register;
486
487 /* carrier off reporting is important to ethtool even BEFORE open */
488 netif_carrier_off(netdev);
489
490 netif_info(adapter, probe, adapter->netdev,
491 "Intel(R) PRO/10GbE Network Connection\n");
492 ixgb_check_options(adapter);
493 /* reset the hardware with the new settings */
494
495 ixgb_reset(adapter);
496
497 cards_found++;
498 return 0;
499
500 err_register:
501 err_sw_init:
502 err_eeprom:
503 iounmap(adapter->hw.hw_addr);
504 err_ioremap:
505 free_netdev(netdev);
506 err_alloc_etherdev:
507 pci_release_regions(pdev);
508 err_request_regions:
509 err_dma_mask:
510 pci_disable_device(pdev);
511 return err;
512 }
513
514 /**
515 * ixgb_remove - Device Removal Routine
516 * @pdev: PCI device information struct
517 *
518 * ixgb_remove is called by the PCI subsystem to alert the driver
519 * that it should release a PCI device. The could be caused by a
520 * Hot-Plug event, or because the driver is going to be removed from
521 * memory.
522 **/
523
524 static void
525 ixgb_remove(struct pci_dev *pdev)
526 {
527 struct net_device *netdev = pci_get_drvdata(pdev);
528 struct ixgb_adapter *adapter = netdev_priv(netdev);
529
530 cancel_work_sync(&adapter->tx_timeout_task);
531
532 unregister_netdev(netdev);
533
534 iounmap(adapter->hw.hw_addr);
535 pci_release_regions(pdev);
536
537 free_netdev(netdev);
538 pci_disable_device(pdev);
539 }
540
541 /**
542 * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
543 * @adapter: board private structure to initialize
544 *
545 * ixgb_sw_init initializes the Adapter private data structure.
546 * Fields are initialized based on PCI device information and
547 * OS network device settings (MTU size).
548 **/
549
550 static int
551 ixgb_sw_init(struct ixgb_adapter *adapter)
552 {
553 struct ixgb_hw *hw = &adapter->hw;
554 struct net_device *netdev = adapter->netdev;
555 struct pci_dev *pdev = adapter->pdev;
556
557 /* PCI config space info */
558
559 hw->vendor_id = pdev->vendor;
560 hw->device_id = pdev->device;
561 hw->subsystem_vendor_id = pdev->subsystem_vendor;
562 hw->subsystem_id = pdev->subsystem_device;
563
564 hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
565 adapter->rx_buffer_len = hw->max_frame_size + 8; /* + 8 for errata */
566
567 if ((hw->device_id == IXGB_DEVICE_ID_82597EX) ||
568 (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4) ||
569 (hw->device_id == IXGB_DEVICE_ID_82597EX_LR) ||
570 (hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
571 hw->mac_type = ixgb_82597;
572 else {
573 /* should never have loaded on this device */
574 netif_err(adapter, probe, adapter->netdev, "unsupported device id\n");
575 }
576
577 /* enable flow control to be programmed */
578 hw->fc.send_xon = 1;
579
580 set_bit(__IXGB_DOWN, &adapter->flags);
581 return 0;
582 }
583
584 /**
585 * ixgb_open - Called when a network interface is made active
586 * @netdev: network interface device structure
587 *
588 * Returns 0 on success, negative value on failure
589 *
590 * The open entry point is called when a network interface is made
591 * active by the system (IFF_UP). At this point all resources needed
592 * for transmit and receive operations are allocated, the interrupt
593 * handler is registered with the OS, the watchdog timer is started,
594 * and the stack is notified that the interface is ready.
595 **/
596
597 static int
598 ixgb_open(struct net_device *netdev)
599 {
600 struct ixgb_adapter *adapter = netdev_priv(netdev);
601 int err;
602
603 /* allocate transmit descriptors */
604 err = ixgb_setup_tx_resources(adapter);
605 if (err)
606 goto err_setup_tx;
607
608 netif_carrier_off(netdev);
609
610 /* allocate receive descriptors */
611
612 err = ixgb_setup_rx_resources(adapter);
613 if (err)
614 goto err_setup_rx;
615
616 err = ixgb_up(adapter);
617 if (err)
618 goto err_up;
619
620 netif_start_queue(netdev);
621
622 return 0;
623
624 err_up:
625 ixgb_free_rx_resources(adapter);
626 err_setup_rx:
627 ixgb_free_tx_resources(adapter);
628 err_setup_tx:
629 ixgb_reset(adapter);
630
631 return err;
632 }
633
634 /**
635 * ixgb_close - Disables a network interface
636 * @netdev: network interface device structure
637 *
638 * Returns 0, this is not allowed to fail
639 *
640 * The close entry point is called when an interface is de-activated
641 * by the OS. The hardware is still under the drivers control, but
642 * needs to be disabled. A global MAC reset is issued to stop the
643 * hardware, and all transmit and receive resources are freed.
644 **/
645
646 static int
647 ixgb_close(struct net_device *netdev)
648 {
649 struct ixgb_adapter *adapter = netdev_priv(netdev);
650
651 ixgb_down(adapter, true);
652
653 ixgb_free_tx_resources(adapter);
654 ixgb_free_rx_resources(adapter);
655
656 return 0;
657 }
658
659 /**
660 * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
661 * @adapter: board private structure
662 *
663 * Return 0 on success, negative on failure
664 **/
665
666 int
667 ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
668 {
669 struct ixgb_desc_ring *txdr = &adapter->tx_ring;
670 struct pci_dev *pdev = adapter->pdev;
671 int size;
672
673 size = sizeof(struct ixgb_buffer) * txdr->count;
674 txdr->buffer_info = vzalloc(size);
675 if (!txdr->buffer_info)
676 return -ENOMEM;
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 = dma_alloc_coherent(&pdev->dev, txdr->size, &txdr->dma,
684 GFP_KERNEL);
685 if (!txdr->desc) {
686 vfree(txdr->buffer_info);
687 return -ENOMEM;
688 }
689
690 txdr->next_to_use = 0;
691 txdr->next_to_clean = 0;
692
693 return 0;
694 }
695
696 /**
697 * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
698 * @adapter: board private structure
699 *
700 * Configure the Tx unit of the MAC after a reset.
701 **/
702
703 static void
704 ixgb_configure_tx(struct ixgb_adapter *adapter)
705 {
706 u64 tdba = adapter->tx_ring.dma;
707 u32 tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
708 u32 tctl;
709 struct ixgb_hw *hw = &adapter->hw;
710
711 /* Setup the Base and Length of the Tx Descriptor Ring
712 * tx_ring.dma can be either a 32 or 64 bit value
713 */
714
715 IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
716 IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
717
718 IXGB_WRITE_REG(hw, TDLEN, tdlen);
719
720 /* Setup the HW Tx Head and Tail descriptor pointers */
721
722 IXGB_WRITE_REG(hw, TDH, 0);
723 IXGB_WRITE_REG(hw, TDT, 0);
724
725 /* don't set up txdctl, it induces performance problems if configured
726 * incorrectly */
727 /* Set the Tx Interrupt Delay register */
728
729 IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
730
731 /* Program the Transmit Control Register */
732
733 tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
734 IXGB_WRITE_REG(hw, TCTL, tctl);
735
736 /* Setup Transmit Descriptor Settings for this adapter */
737 adapter->tx_cmd_type =
738 IXGB_TX_DESC_TYPE |
739 (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
740 }
741
742 /**
743 * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
744 * @adapter: board private structure
745 *
746 * Returns 0 on success, negative on failure
747 **/
748
749 int
750 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
751 {
752 struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
753 struct pci_dev *pdev = adapter->pdev;
754 int size;
755
756 size = sizeof(struct ixgb_buffer) * rxdr->count;
757 rxdr->buffer_info = vzalloc(size);
758 if (!rxdr->buffer_info)
759 return -ENOMEM;
760
761 /* Round up to nearest 4K */
762
763 rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
764 rxdr->size = ALIGN(rxdr->size, 4096);
765
766 rxdr->desc = dma_alloc_coherent(&pdev->dev, rxdr->size, &rxdr->dma,
767 GFP_KERNEL);
768
769 if (!rxdr->desc) {
770 vfree(rxdr->buffer_info);
771 return -ENOMEM;
772 }
773
774 rxdr->next_to_clean = 0;
775 rxdr->next_to_use = 0;
776
777 return 0;
778 }
779
780 /**
781 * ixgb_setup_rctl - configure the receive control register
782 * @adapter: Board private structure
783 **/
784
785 static void
786 ixgb_setup_rctl(struct ixgb_adapter *adapter)
787 {
788 u32 rctl;
789
790 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
791
792 rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
793
794 rctl |=
795 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
796 IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
797 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
798
799 rctl |= IXGB_RCTL_SECRC;
800
801 if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048)
802 rctl |= IXGB_RCTL_BSIZE_2048;
803 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096)
804 rctl |= IXGB_RCTL_BSIZE_4096;
805 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192)
806 rctl |= IXGB_RCTL_BSIZE_8192;
807 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384)
808 rctl |= IXGB_RCTL_BSIZE_16384;
809
810 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
811 }
812
813 /**
814 * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
815 * @adapter: board private structure
816 *
817 * Configure the Rx unit of the MAC after a reset.
818 **/
819
820 static void
821 ixgb_configure_rx(struct ixgb_adapter *adapter)
822 {
823 u64 rdba = adapter->rx_ring.dma;
824 u32 rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
825 struct ixgb_hw *hw = &adapter->hw;
826 u32 rctl;
827 u32 rxcsum;
828
829 /* make sure receives are disabled while setting up the descriptors */
830
831 rctl = IXGB_READ_REG(hw, RCTL);
832 IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
833
834 /* set the Receive Delay Timer Register */
835
836 IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
837
838 /* Setup the Base and Length of the Rx Descriptor Ring */
839
840 IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
841 IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
842
843 IXGB_WRITE_REG(hw, RDLEN, rdlen);
844
845 /* Setup the HW Rx Head and Tail Descriptor Pointers */
846 IXGB_WRITE_REG(hw, RDH, 0);
847 IXGB_WRITE_REG(hw, RDT, 0);
848
849 /* due to the hardware errata with RXDCTL, we are unable to use any of
850 * the performance enhancing features of it without causing other
851 * subtle bugs, some of the bugs could include receive length
852 * corruption at high data rates (WTHRESH > 0) and/or receive
853 * descriptor ring irregularites (particularly in hardware cache) */
854 IXGB_WRITE_REG(hw, RXDCTL, 0);
855
856 /* Enable Receive Checksum Offload for TCP and UDP */
857 if (adapter->rx_csum) {
858 rxcsum = IXGB_READ_REG(hw, RXCSUM);
859 rxcsum |= IXGB_RXCSUM_TUOFL;
860 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
861 }
862
863 /* Enable Receives */
864
865 IXGB_WRITE_REG(hw, RCTL, rctl);
866 }
867
868 /**
869 * ixgb_free_tx_resources - Free Tx Resources
870 * @adapter: board private structure
871 *
872 * Free all transmit software resources
873 **/
874
875 void
876 ixgb_free_tx_resources(struct ixgb_adapter *adapter)
877 {
878 struct pci_dev *pdev = adapter->pdev;
879
880 ixgb_clean_tx_ring(adapter);
881
882 vfree(adapter->tx_ring.buffer_info);
883 adapter->tx_ring.buffer_info = NULL;
884
885 dma_free_coherent(&pdev->dev, adapter->tx_ring.size,
886 adapter->tx_ring.desc, adapter->tx_ring.dma);
887
888 adapter->tx_ring.desc = NULL;
889 }
890
891 static void
892 ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
893 struct ixgb_buffer *buffer_info)
894 {
895 if (buffer_info->dma) {
896 if (buffer_info->mapped_as_page)
897 dma_unmap_page(&adapter->pdev->dev, buffer_info->dma,
898 buffer_info->length, DMA_TO_DEVICE);
899 else
900 dma_unmap_single(&adapter->pdev->dev, buffer_info->dma,
901 buffer_info->length, DMA_TO_DEVICE);
902 buffer_info->dma = 0;
903 }
904
905 if (buffer_info->skb) {
906 dev_kfree_skb_any(buffer_info->skb);
907 buffer_info->skb = NULL;
908 }
909 buffer_info->time_stamp = 0;
910 /* these fields must always be initialized in tx
911 * buffer_info->length = 0;
912 * buffer_info->next_to_watch = 0; */
913 }
914
915 /**
916 * ixgb_clean_tx_ring - Free Tx Buffers
917 * @adapter: board private structure
918 **/
919
920 static void
921 ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
922 {
923 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
924 struct ixgb_buffer *buffer_info;
925 unsigned long size;
926 unsigned int i;
927
928 /* Free all the Tx ring sk_buffs */
929
930 for (i = 0; i < tx_ring->count; i++) {
931 buffer_info = &tx_ring->buffer_info[i];
932 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
933 }
934
935 size = sizeof(struct ixgb_buffer) * tx_ring->count;
936 memset(tx_ring->buffer_info, 0, size);
937
938 /* Zero out the descriptor ring */
939
940 memset(tx_ring->desc, 0, tx_ring->size);
941
942 tx_ring->next_to_use = 0;
943 tx_ring->next_to_clean = 0;
944
945 IXGB_WRITE_REG(&adapter->hw, TDH, 0);
946 IXGB_WRITE_REG(&adapter->hw, TDT, 0);
947 }
948
949 /**
950 * ixgb_free_rx_resources - Free Rx Resources
951 * @adapter: board private structure
952 *
953 * Free all receive software resources
954 **/
955
956 void
957 ixgb_free_rx_resources(struct ixgb_adapter *adapter)
958 {
959 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
960 struct pci_dev *pdev = adapter->pdev;
961
962 ixgb_clean_rx_ring(adapter);
963
964 vfree(rx_ring->buffer_info);
965 rx_ring->buffer_info = NULL;
966
967 dma_free_coherent(&pdev->dev, rx_ring->size, rx_ring->desc,
968 rx_ring->dma);
969
970 rx_ring->desc = NULL;
971 }
972
973 /**
974 * ixgb_clean_rx_ring - Free Rx Buffers
975 * @adapter: board private structure
976 **/
977
978 static void
979 ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
980 {
981 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
982 struct ixgb_buffer *buffer_info;
983 struct pci_dev *pdev = adapter->pdev;
984 unsigned long size;
985 unsigned int i;
986
987 /* Free all the Rx ring sk_buffs */
988
989 for (i = 0; i < rx_ring->count; i++) {
990 buffer_info = &rx_ring->buffer_info[i];
991 if (buffer_info->dma) {
992 dma_unmap_single(&pdev->dev,
993 buffer_info->dma,
994 buffer_info->length,
995 DMA_FROM_DEVICE);
996 buffer_info->dma = 0;
997 buffer_info->length = 0;
998 }
999
1000 if (buffer_info->skb) {
1001 dev_kfree_skb(buffer_info->skb);
1002 buffer_info->skb = NULL;
1003 }
1004 }
1005
1006 size = sizeof(struct ixgb_buffer) * rx_ring->count;
1007 memset(rx_ring->buffer_info, 0, size);
1008
1009 /* Zero out the descriptor ring */
1010
1011 memset(rx_ring->desc, 0, rx_ring->size);
1012
1013 rx_ring->next_to_clean = 0;
1014 rx_ring->next_to_use = 0;
1015
1016 IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1017 IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1018 }
1019
1020 /**
1021 * ixgb_set_mac - Change the Ethernet Address of the NIC
1022 * @netdev: network interface device structure
1023 * @p: pointer to an address structure
1024 *
1025 * Returns 0 on success, negative on failure
1026 **/
1027
1028 static int
1029 ixgb_set_mac(struct net_device *netdev, void *p)
1030 {
1031 struct ixgb_adapter *adapter = netdev_priv(netdev);
1032 struct sockaddr *addr = p;
1033
1034 if (!is_valid_ether_addr(addr->sa_data))
1035 return -EADDRNOTAVAIL;
1036
1037 memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1038
1039 ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1040
1041 return 0;
1042 }
1043
1044 /**
1045 * ixgb_set_multi - Multicast and Promiscuous mode set
1046 * @netdev: network interface device structure
1047 *
1048 * The set_multi entry point is called whenever the multicast address
1049 * list or the network interface flags are updated. This routine is
1050 * responsible for configuring the hardware for proper multicast,
1051 * promiscuous mode, and all-multi behavior.
1052 **/
1053
1054 static void
1055 ixgb_set_multi(struct net_device *netdev)
1056 {
1057 struct ixgb_adapter *adapter = netdev_priv(netdev);
1058 struct ixgb_hw *hw = &adapter->hw;
1059 struct netdev_hw_addr *ha;
1060 u32 rctl;
1061
1062 /* Check for Promiscuous and All Multicast modes */
1063
1064 rctl = IXGB_READ_REG(hw, RCTL);
1065
1066 if (netdev->flags & IFF_PROMISC) {
1067 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1068 /* disable VLAN filtering */
1069 rctl &= ~IXGB_RCTL_CFIEN;
1070 rctl &= ~IXGB_RCTL_VFE;
1071 } else {
1072 if (netdev->flags & IFF_ALLMULTI) {
1073 rctl |= IXGB_RCTL_MPE;
1074 rctl &= ~IXGB_RCTL_UPE;
1075 } else {
1076 rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1077 }
1078 /* enable VLAN filtering */
1079 rctl |= IXGB_RCTL_VFE;
1080 rctl &= ~IXGB_RCTL_CFIEN;
1081 }
1082
1083 if (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1084 rctl |= IXGB_RCTL_MPE;
1085 IXGB_WRITE_REG(hw, RCTL, rctl);
1086 } else {
1087 u8 *mta = kmalloc_array(ETH_ALEN,
1088 IXGB_MAX_NUM_MULTICAST_ADDRESSES,
1089 GFP_ATOMIC);
1090 u8 *addr;
1091 if (!mta)
1092 goto alloc_failed;
1093
1094 IXGB_WRITE_REG(hw, RCTL, rctl);
1095
1096 addr = mta;
1097 netdev_for_each_mc_addr(ha, netdev) {
1098 memcpy(addr, ha->addr, ETH_ALEN);
1099 addr += ETH_ALEN;
1100 }
1101
1102 ixgb_mc_addr_list_update(hw, mta, netdev_mc_count(netdev), 0);
1103 kfree(mta);
1104 }
1105
1106 alloc_failed:
1107 if (netdev->features & NETIF_F_HW_VLAN_CTAG_RX)
1108 ixgb_vlan_strip_enable(adapter);
1109 else
1110 ixgb_vlan_strip_disable(adapter);
1111
1112 }
1113
1114 /**
1115 * ixgb_watchdog - Timer Call-back
1116 * @data: pointer to netdev cast into an unsigned long
1117 **/
1118
1119 static void
1120 ixgb_watchdog(struct timer_list *t)
1121 {
1122 struct ixgb_adapter *adapter = from_timer(adapter, t, watchdog_timer);
1123 struct net_device *netdev = adapter->netdev;
1124 struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1125
1126 ixgb_check_for_link(&adapter->hw);
1127
1128 if (ixgb_check_for_bad_link(&adapter->hw)) {
1129 /* force the reset path */
1130 netif_stop_queue(netdev);
1131 }
1132
1133 if (adapter->hw.link_up) {
1134 if (!netif_carrier_ok(netdev)) {
1135 netdev_info(netdev,
1136 "NIC Link is Up 10 Gbps Full Duplex, Flow Control: %s\n",
1137 (adapter->hw.fc.type == ixgb_fc_full) ?
1138 "RX/TX" :
1139 (adapter->hw.fc.type == ixgb_fc_rx_pause) ?
1140 "RX" :
1141 (adapter->hw.fc.type == ixgb_fc_tx_pause) ?
1142 "TX" : "None");
1143 adapter->link_speed = 10000;
1144 adapter->link_duplex = FULL_DUPLEX;
1145 netif_carrier_on(netdev);
1146 }
1147 } else {
1148 if (netif_carrier_ok(netdev)) {
1149 adapter->link_speed = 0;
1150 adapter->link_duplex = 0;
1151 netdev_info(netdev, "NIC Link is Down\n");
1152 netif_carrier_off(netdev);
1153 }
1154 }
1155
1156 ixgb_update_stats(adapter);
1157
1158 if (!netif_carrier_ok(netdev)) {
1159 if (IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1160 /* We've lost link, so the controller stops DMA,
1161 * but we've got queued Tx work that's never going
1162 * to get done, so reset controller to flush Tx.
1163 * (Do the reset outside of interrupt context). */
1164 schedule_work(&adapter->tx_timeout_task);
1165 /* return immediately since reset is imminent */
1166 return;
1167 }
1168 }
1169
1170 /* Force detection of hung controller every watchdog period */
1171 adapter->detect_tx_hung = true;
1172
1173 /* generate an interrupt to force clean up of any stragglers */
1174 IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1175
1176 /* Reset the timer */
1177 mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1178 }
1179
1180 #define IXGB_TX_FLAGS_CSUM 0x00000001
1181 #define IXGB_TX_FLAGS_VLAN 0x00000002
1182 #define IXGB_TX_FLAGS_TSO 0x00000004
1183
1184 static int
1185 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1186 {
1187 struct ixgb_context_desc *context_desc;
1188 unsigned int i;
1189 u8 ipcss, ipcso, tucss, tucso, hdr_len;
1190 u16 ipcse, tucse, mss;
1191
1192 if (likely(skb_is_gso(skb))) {
1193 struct ixgb_buffer *buffer_info;
1194 struct iphdr *iph;
1195 int err;
1196
1197 err = skb_cow_head(skb, 0);
1198 if (err < 0)
1199 return err;
1200
1201 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
1202 mss = skb_shinfo(skb)->gso_size;
1203 iph = ip_hdr(skb);
1204 iph->tot_len = 0;
1205 iph->check = 0;
1206 tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
1207 iph->daddr, 0,
1208 IPPROTO_TCP, 0);
1209 ipcss = skb_network_offset(skb);
1210 ipcso = (void *)&(iph->check) - (void *)skb->data;
1211 ipcse = skb_transport_offset(skb) - 1;
1212 tucss = skb_transport_offset(skb);
1213 tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data;
1214 tucse = 0;
1215
1216 i = adapter->tx_ring.next_to_use;
1217 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1218 buffer_info = &adapter->tx_ring.buffer_info[i];
1219 WARN_ON(buffer_info->dma != 0);
1220
1221 context_desc->ipcss = ipcss;
1222 context_desc->ipcso = ipcso;
1223 context_desc->ipcse = cpu_to_le16(ipcse);
1224 context_desc->tucss = tucss;
1225 context_desc->tucso = tucso;
1226 context_desc->tucse = cpu_to_le16(tucse);
1227 context_desc->mss = cpu_to_le16(mss);
1228 context_desc->hdr_len = hdr_len;
1229 context_desc->status = 0;
1230 context_desc->cmd_type_len = cpu_to_le32(
1231 IXGB_CONTEXT_DESC_TYPE
1232 | IXGB_CONTEXT_DESC_CMD_TSE
1233 | IXGB_CONTEXT_DESC_CMD_IP
1234 | IXGB_CONTEXT_DESC_CMD_TCP
1235 | IXGB_CONTEXT_DESC_CMD_IDE
1236 | (skb->len - (hdr_len)));
1237
1238
1239 if (++i == adapter->tx_ring.count) i = 0;
1240 adapter->tx_ring.next_to_use = i;
1241
1242 return 1;
1243 }
1244
1245 return 0;
1246 }
1247
1248 static bool
1249 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1250 {
1251 struct ixgb_context_desc *context_desc;
1252 unsigned int i;
1253 u8 css, cso;
1254
1255 if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
1256 struct ixgb_buffer *buffer_info;
1257 css = skb_checksum_start_offset(skb);
1258 cso = css + skb->csum_offset;
1259
1260 i = adapter->tx_ring.next_to_use;
1261 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1262 buffer_info = &adapter->tx_ring.buffer_info[i];
1263 WARN_ON(buffer_info->dma != 0);
1264
1265 context_desc->tucss = css;
1266 context_desc->tucso = cso;
1267 context_desc->tucse = 0;
1268 /* zero out any previously existing data in one instruction */
1269 *(u32 *)&(context_desc->ipcss) = 0;
1270 context_desc->status = 0;
1271 context_desc->hdr_len = 0;
1272 context_desc->mss = 0;
1273 context_desc->cmd_type_len =
1274 cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1275 | IXGB_TX_DESC_CMD_IDE);
1276
1277 if (++i == adapter->tx_ring.count) i = 0;
1278 adapter->tx_ring.next_to_use = i;
1279
1280 return true;
1281 }
1282
1283 return false;
1284 }
1285
1286 #define IXGB_MAX_TXD_PWR 14
1287 #define IXGB_MAX_DATA_PER_TXD (1<<IXGB_MAX_TXD_PWR)
1288
1289 static int
1290 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1291 unsigned int first)
1292 {
1293 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1294 struct pci_dev *pdev = adapter->pdev;
1295 struct ixgb_buffer *buffer_info;
1296 int len = skb_headlen(skb);
1297 unsigned int offset = 0, size, count = 0, i;
1298 unsigned int mss = skb_shinfo(skb)->gso_size;
1299 unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1300 unsigned int f;
1301
1302 i = tx_ring->next_to_use;
1303
1304 while (len) {
1305 buffer_info = &tx_ring->buffer_info[i];
1306 size = min(len, IXGB_MAX_DATA_PER_TXD);
1307 /* Workaround for premature desc write-backs
1308 * in TSO mode. Append 4-byte sentinel desc */
1309 if (unlikely(mss && !nr_frags && size == len && size > 8))
1310 size -= 4;
1311
1312 buffer_info->length = size;
1313 WARN_ON(buffer_info->dma != 0);
1314 buffer_info->time_stamp = jiffies;
1315 buffer_info->mapped_as_page = false;
1316 buffer_info->dma = dma_map_single(&pdev->dev,
1317 skb->data + offset,
1318 size, DMA_TO_DEVICE);
1319 if (dma_mapping_error(&pdev->dev, buffer_info->dma))
1320 goto dma_error;
1321 buffer_info->next_to_watch = 0;
1322
1323 len -= size;
1324 offset += size;
1325 count++;
1326 if (len) {
1327 i++;
1328 if (i == tx_ring->count)
1329 i = 0;
1330 }
1331 }
1332
1333 for (f = 0; f < nr_frags; f++) {
1334 const skb_frag_t *frag = &skb_shinfo(skb)->frags[f];
1335 len = skb_frag_size(frag);
1336 offset = 0;
1337
1338 while (len) {
1339 i++;
1340 if (i == tx_ring->count)
1341 i = 0;
1342
1343 buffer_info = &tx_ring->buffer_info[i];
1344 size = min(len, IXGB_MAX_DATA_PER_TXD);
1345
1346 /* Workaround for premature desc write-backs
1347 * in TSO mode. Append 4-byte sentinel desc */
1348 if (unlikely(mss && (f == (nr_frags - 1))
1349 && size == len && size > 8))
1350 size -= 4;
1351
1352 buffer_info->length = size;
1353 buffer_info->time_stamp = jiffies;
1354 buffer_info->mapped_as_page = true;
1355 buffer_info->dma =
1356 skb_frag_dma_map(&pdev->dev, frag, offset, size,
1357 DMA_TO_DEVICE);
1358 if (dma_mapping_error(&pdev->dev, buffer_info->dma))
1359 goto dma_error;
1360 buffer_info->next_to_watch = 0;
1361
1362 len -= size;
1363 offset += size;
1364 count++;
1365 }
1366 }
1367 tx_ring->buffer_info[i].skb = skb;
1368 tx_ring->buffer_info[first].next_to_watch = i;
1369
1370 return count;
1371
1372 dma_error:
1373 dev_err(&pdev->dev, "TX DMA map failed\n");
1374 buffer_info->dma = 0;
1375 if (count)
1376 count--;
1377
1378 while (count--) {
1379 if (i==0)
1380 i += tx_ring->count;
1381 i--;
1382 buffer_info = &tx_ring->buffer_info[i];
1383 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1384 }
1385
1386 return 0;
1387 }
1388
1389 static void
1390 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1391 {
1392 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1393 struct ixgb_tx_desc *tx_desc = NULL;
1394 struct ixgb_buffer *buffer_info;
1395 u32 cmd_type_len = adapter->tx_cmd_type;
1396 u8 status = 0;
1397 u8 popts = 0;
1398 unsigned int i;
1399
1400 if (tx_flags & IXGB_TX_FLAGS_TSO) {
1401 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1402 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1403 }
1404
1405 if (tx_flags & IXGB_TX_FLAGS_CSUM)
1406 popts |= IXGB_TX_DESC_POPTS_TXSM;
1407
1408 if (tx_flags & IXGB_TX_FLAGS_VLAN)
1409 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1410
1411 i = tx_ring->next_to_use;
1412
1413 while (count--) {
1414 buffer_info = &tx_ring->buffer_info[i];
1415 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1416 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1417 tx_desc->cmd_type_len =
1418 cpu_to_le32(cmd_type_len | buffer_info->length);
1419 tx_desc->status = status;
1420 tx_desc->popts = popts;
1421 tx_desc->vlan = cpu_to_le16(vlan_id);
1422
1423 if (++i == tx_ring->count) i = 0;
1424 }
1425
1426 tx_desc->cmd_type_len |=
1427 cpu_to_le32(IXGB_TX_DESC_CMD_EOP | IXGB_TX_DESC_CMD_RS);
1428
1429 /* Force memory writes to complete before letting h/w
1430 * know there are new descriptors to fetch. (Only
1431 * applicable for weak-ordered memory model archs,
1432 * such as IA-64). */
1433 wmb();
1434
1435 tx_ring->next_to_use = i;
1436 IXGB_WRITE_REG(&adapter->hw, TDT, i);
1437 }
1438
1439 static int __ixgb_maybe_stop_tx(struct net_device *netdev, int size)
1440 {
1441 struct ixgb_adapter *adapter = netdev_priv(netdev);
1442 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1443
1444 netif_stop_queue(netdev);
1445 /* Herbert's original patch had:
1446 * smp_mb__after_netif_stop_queue();
1447 * but since that doesn't exist yet, just open code it. */
1448 smp_mb();
1449
1450 /* We need to check again in a case another CPU has just
1451 * made room available. */
1452 if (likely(IXGB_DESC_UNUSED(tx_ring) < size))
1453 return -EBUSY;
1454
1455 /* A reprieve! */
1456 netif_start_queue(netdev);
1457 ++adapter->restart_queue;
1458 return 0;
1459 }
1460
1461 static int ixgb_maybe_stop_tx(struct net_device *netdev,
1462 struct ixgb_desc_ring *tx_ring, int size)
1463 {
1464 if (likely(IXGB_DESC_UNUSED(tx_ring) >= size))
1465 return 0;
1466 return __ixgb_maybe_stop_tx(netdev, size);
1467 }
1468
1469
1470 /* Tx Descriptors needed, worst case */
1471 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1472 (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1473 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) /* skb->date */ + \
1474 MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 /* for context */ \
1475 + 1 /* one more needed for sentinel TSO workaround */
1476
1477 static netdev_tx_t
1478 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1479 {
1480 struct ixgb_adapter *adapter = netdev_priv(netdev);
1481 unsigned int first;
1482 unsigned int tx_flags = 0;
1483 int vlan_id = 0;
1484 int count = 0;
1485 int tso;
1486
1487 if (test_bit(__IXGB_DOWN, &adapter->flags)) {
1488 dev_kfree_skb_any(skb);
1489 return NETDEV_TX_OK;
1490 }
1491
1492 if (skb->len <= 0) {
1493 dev_kfree_skb_any(skb);
1494 return NETDEV_TX_OK;
1495 }
1496
1497 if (unlikely(ixgb_maybe_stop_tx(netdev, &adapter->tx_ring,
1498 DESC_NEEDED)))
1499 return NETDEV_TX_BUSY;
1500
1501 if (skb_vlan_tag_present(skb)) {
1502 tx_flags |= IXGB_TX_FLAGS_VLAN;
1503 vlan_id = skb_vlan_tag_get(skb);
1504 }
1505
1506 first = adapter->tx_ring.next_to_use;
1507
1508 tso = ixgb_tso(adapter, skb);
1509 if (tso < 0) {
1510 dev_kfree_skb_any(skb);
1511 return NETDEV_TX_OK;
1512 }
1513
1514 if (likely(tso))
1515 tx_flags |= IXGB_TX_FLAGS_TSO;
1516 else if (ixgb_tx_csum(adapter, skb))
1517 tx_flags |= IXGB_TX_FLAGS_CSUM;
1518
1519 count = ixgb_tx_map(adapter, skb, first);
1520
1521 if (count) {
1522 ixgb_tx_queue(adapter, count, vlan_id, tx_flags);
1523 /* Make sure there is space in the ring for the next send. */
1524 ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED);
1525
1526 } else {
1527 dev_kfree_skb_any(skb);
1528 adapter->tx_ring.buffer_info[first].time_stamp = 0;
1529 adapter->tx_ring.next_to_use = first;
1530 }
1531
1532 return NETDEV_TX_OK;
1533 }
1534
1535 /**
1536 * ixgb_tx_timeout - Respond to a Tx Hang
1537 * @netdev: network interface device structure
1538 **/
1539
1540 static void
1541 ixgb_tx_timeout(struct net_device *netdev, unsigned int txqueue)
1542 {
1543 struct ixgb_adapter *adapter = netdev_priv(netdev);
1544
1545 /* Do the reset outside of interrupt context */
1546 schedule_work(&adapter->tx_timeout_task);
1547 }
1548
1549 static void
1550 ixgb_tx_timeout_task(struct work_struct *work)
1551 {
1552 struct ixgb_adapter *adapter =
1553 container_of(work, struct ixgb_adapter, tx_timeout_task);
1554
1555 adapter->tx_timeout_count++;
1556 ixgb_down(adapter, true);
1557 ixgb_up(adapter);
1558 }
1559
1560 /**
1561 * ixgb_change_mtu - Change the Maximum Transfer Unit
1562 * @netdev: network interface device structure
1563 * @new_mtu: new value for maximum frame size
1564 *
1565 * Returns 0 on success, negative on failure
1566 **/
1567
1568 static int
1569 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1570 {
1571 struct ixgb_adapter *adapter = netdev_priv(netdev);
1572 int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1573
1574 if (netif_running(netdev))
1575 ixgb_down(adapter, true);
1576
1577 adapter->rx_buffer_len = max_frame + 8; /* + 8 for errata */
1578
1579 netdev->mtu = new_mtu;
1580
1581 if (netif_running(netdev))
1582 ixgb_up(adapter);
1583
1584 return 0;
1585 }
1586
1587 /**
1588 * ixgb_update_stats - Update the board statistics counters.
1589 * @adapter: board private structure
1590 **/
1591
1592 void
1593 ixgb_update_stats(struct ixgb_adapter *adapter)
1594 {
1595 struct net_device *netdev = adapter->netdev;
1596 struct pci_dev *pdev = adapter->pdev;
1597
1598 /* Prevent stats update while adapter is being reset */
1599 if (pci_channel_offline(pdev))
1600 return;
1601
1602 if ((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1603 (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1604 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1605 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1606 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1607 u64 bcast = ((u64)bcast_h << 32) | bcast_l;
1608
1609 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1610 /* fix up multicast stats by removing broadcasts */
1611 if (multi >= bcast)
1612 multi -= bcast;
1613
1614 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1615 adapter->stats.mprch += (multi >> 32);
1616 adapter->stats.bprcl += bcast_l;
1617 adapter->stats.bprch += bcast_h;
1618 } else {
1619 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1620 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1621 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1622 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1623 }
1624 adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1625 adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1626 adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1627 adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1628 adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1629 adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1630 adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1631 adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1632 adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1633 adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1634 adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1635 adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1636 adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1637 adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1638 adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1639 adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1640 adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1641 adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1642 adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1643 adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1644 adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1645 adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1646 adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1647 adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1648 adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1649 adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1650 adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1651 adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1652 adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1653 adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1654 adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1655 adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1656 adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1657 adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1658 adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1659 adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1660 adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1661 adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1662 adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1663 adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1664 adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1665 adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1666 adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1667 adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1668 adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1669 adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1670 adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1671 adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1672 adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1673 adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1674 adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1675 adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1676 adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1677 adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1678 adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1679 adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1680
1681 /* Fill out the OS statistics structure */
1682
1683 netdev->stats.rx_packets = adapter->stats.gprcl;
1684 netdev->stats.tx_packets = adapter->stats.gptcl;
1685 netdev->stats.rx_bytes = adapter->stats.gorcl;
1686 netdev->stats.tx_bytes = adapter->stats.gotcl;
1687 netdev->stats.multicast = adapter->stats.mprcl;
1688 netdev->stats.collisions = 0;
1689
1690 /* ignore RLEC as it reports errors for padded (<64bytes) frames
1691 * with a length in the type/len field */
1692 netdev->stats.rx_errors =
1693 /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1694 adapter->stats.ruc +
1695 adapter->stats.roc /*+ adapter->stats.rlec */ +
1696 adapter->stats.icbc +
1697 adapter->stats.ecbc + adapter->stats.mpc;
1698
1699 /* see above
1700 * netdev->stats.rx_length_errors = adapter->stats.rlec;
1701 */
1702
1703 netdev->stats.rx_crc_errors = adapter->stats.crcerrs;
1704 netdev->stats.rx_fifo_errors = adapter->stats.mpc;
1705 netdev->stats.rx_missed_errors = adapter->stats.mpc;
1706 netdev->stats.rx_over_errors = adapter->stats.mpc;
1707
1708 netdev->stats.tx_errors = 0;
1709 netdev->stats.rx_frame_errors = 0;
1710 netdev->stats.tx_aborted_errors = 0;
1711 netdev->stats.tx_carrier_errors = 0;
1712 netdev->stats.tx_fifo_errors = 0;
1713 netdev->stats.tx_heartbeat_errors = 0;
1714 netdev->stats.tx_window_errors = 0;
1715 }
1716
1717 #define IXGB_MAX_INTR 10
1718 /**
1719 * ixgb_intr - Interrupt Handler
1720 * @irq: interrupt number
1721 * @data: pointer to a network interface device structure
1722 **/
1723
1724 static irqreturn_t
1725 ixgb_intr(int irq, void *data)
1726 {
1727 struct net_device *netdev = data;
1728 struct ixgb_adapter *adapter = netdev_priv(netdev);
1729 struct ixgb_hw *hw = &adapter->hw;
1730 u32 icr = IXGB_READ_REG(hw, ICR);
1731
1732 if (unlikely(!icr))
1733 return IRQ_NONE; /* Not our interrupt */
1734
1735 if (unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC)))
1736 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1737 mod_timer(&adapter->watchdog_timer, jiffies);
1738
1739 if (napi_schedule_prep(&adapter->napi)) {
1740
1741 /* Disable interrupts and register for poll. The flush
1742 of the posted write is intentionally left out.
1743 */
1744
1745 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1746 __napi_schedule(&adapter->napi);
1747 }
1748 return IRQ_HANDLED;
1749 }
1750
1751 /**
1752 * ixgb_clean - NAPI Rx polling callback
1753 * @adapter: board private structure
1754 **/
1755
1756 static int
1757 ixgb_clean(struct napi_struct *napi, int budget)
1758 {
1759 struct ixgb_adapter *adapter = container_of(napi, struct ixgb_adapter, napi);
1760 int work_done = 0;
1761
1762 ixgb_clean_tx_irq(adapter);
1763 ixgb_clean_rx_irq(adapter, &work_done, budget);
1764
1765 /* If budget not fully consumed, exit the polling mode */
1766 if (work_done < budget) {
1767 napi_complete_done(napi, work_done);
1768 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1769 ixgb_irq_enable(adapter);
1770 }
1771
1772 return work_done;
1773 }
1774
1775 /**
1776 * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1777 * @adapter: board private structure
1778 **/
1779
1780 static bool
1781 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1782 {
1783 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1784 struct net_device *netdev = adapter->netdev;
1785 struct ixgb_tx_desc *tx_desc, *eop_desc;
1786 struct ixgb_buffer *buffer_info;
1787 unsigned int i, eop;
1788 bool cleaned = false;
1789
1790 i = tx_ring->next_to_clean;
1791 eop = tx_ring->buffer_info[i].next_to_watch;
1792 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1793
1794 while (eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1795
1796 rmb(); /* read buffer_info after eop_desc */
1797 for (cleaned = false; !cleaned; ) {
1798 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1799 buffer_info = &tx_ring->buffer_info[i];
1800
1801 if (tx_desc->popts &
1802 (IXGB_TX_DESC_POPTS_TXSM |
1803 IXGB_TX_DESC_POPTS_IXSM))
1804 adapter->hw_csum_tx_good++;
1805
1806 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1807
1808 *(u32 *)&(tx_desc->status) = 0;
1809
1810 cleaned = (i == eop);
1811 if (++i == tx_ring->count) i = 0;
1812 }
1813
1814 eop = tx_ring->buffer_info[i].next_to_watch;
1815 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1816 }
1817
1818 tx_ring->next_to_clean = i;
1819
1820 if (unlikely(cleaned && netif_carrier_ok(netdev) &&
1821 IXGB_DESC_UNUSED(tx_ring) >= DESC_NEEDED)) {
1822 /* Make sure that anybody stopping the queue after this
1823 * sees the new next_to_clean. */
1824 smp_mb();
1825
1826 if (netif_queue_stopped(netdev) &&
1827 !(test_bit(__IXGB_DOWN, &adapter->flags))) {
1828 netif_wake_queue(netdev);
1829 ++adapter->restart_queue;
1830 }
1831 }
1832
1833 if (adapter->detect_tx_hung) {
1834 /* detect a transmit hang in hardware, this serializes the
1835 * check with the clearing of time_stamp and movement of i */
1836 adapter->detect_tx_hung = false;
1837 if (tx_ring->buffer_info[eop].time_stamp &&
1838 time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ)
1839 && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1840 IXGB_STATUS_TXOFF)) {
1841 /* detected Tx unit hang */
1842 netif_err(adapter, drv, adapter->netdev,
1843 "Detected Tx Unit Hang\n"
1844 " TDH <%x>\n"
1845 " TDT <%x>\n"
1846 " next_to_use <%x>\n"
1847 " next_to_clean <%x>\n"
1848 "buffer_info[next_to_clean]\n"
1849 " time_stamp <%lx>\n"
1850 " next_to_watch <%x>\n"
1851 " jiffies <%lx>\n"
1852 " next_to_watch.status <%x>\n",
1853 IXGB_READ_REG(&adapter->hw, TDH),
1854 IXGB_READ_REG(&adapter->hw, TDT),
1855 tx_ring->next_to_use,
1856 tx_ring->next_to_clean,
1857 tx_ring->buffer_info[eop].time_stamp,
1858 eop,
1859 jiffies,
1860 eop_desc->status);
1861 netif_stop_queue(netdev);
1862 }
1863 }
1864
1865 return cleaned;
1866 }
1867
1868 /**
1869 * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1870 * @adapter: board private structure
1871 * @rx_desc: receive descriptor
1872 * @sk_buff: socket buffer with received data
1873 **/
1874
1875 static void
1876 ixgb_rx_checksum(struct ixgb_adapter *adapter,
1877 struct ixgb_rx_desc *rx_desc,
1878 struct sk_buff *skb)
1879 {
1880 /* Ignore Checksum bit is set OR
1881 * TCP Checksum has not been calculated
1882 */
1883 if ((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1884 (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1885 skb_checksum_none_assert(skb);
1886 return;
1887 }
1888
1889 /* At this point we know the hardware did the TCP checksum */
1890 /* now look at the TCP checksum error bit */
1891 if (rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1892 /* let the stack verify checksum errors */
1893 skb_checksum_none_assert(skb);
1894 adapter->hw_csum_rx_error++;
1895 } else {
1896 /* TCP checksum is good */
1897 skb->ip_summed = CHECKSUM_UNNECESSARY;
1898 adapter->hw_csum_rx_good++;
1899 }
1900 }
1901
1902 /*
1903 * this should improve performance for small packets with large amounts
1904 * of reassembly being done in the stack
1905 */
1906 static void ixgb_check_copybreak(struct napi_struct *napi,
1907 struct ixgb_buffer *buffer_info,
1908 u32 length, struct sk_buff **skb)
1909 {
1910 struct sk_buff *new_skb;
1911
1912 if (length > copybreak)
1913 return;
1914
1915 new_skb = napi_alloc_skb(napi, length);
1916 if (!new_skb)
1917 return;
1918
1919 skb_copy_to_linear_data_offset(new_skb, -NET_IP_ALIGN,
1920 (*skb)->data - NET_IP_ALIGN,
1921 length + NET_IP_ALIGN);
1922 /* save the skb in buffer_info as good */
1923 buffer_info->skb = *skb;
1924 *skb = new_skb;
1925 }
1926
1927 /**
1928 * ixgb_clean_rx_irq - Send received data up the network stack,
1929 * @adapter: board private structure
1930 **/
1931
1932 static bool
1933 ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
1934 {
1935 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1936 struct net_device *netdev = adapter->netdev;
1937 struct pci_dev *pdev = adapter->pdev;
1938 struct ixgb_rx_desc *rx_desc, *next_rxd;
1939 struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
1940 u32 length;
1941 unsigned int i, j;
1942 int cleaned_count = 0;
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;
1951 u8 status;
1952
1953 if (*work_done >= work_to_do)
1954 break;
1955
1956 (*work_done)++;
1957 rmb(); /* read descriptor and rx_buffer_info after status DD */
1958 status = rx_desc->status;
1959 skb = buffer_info->skb;
1960 buffer_info->skb = NULL;
1961
1962 prefetch(skb->data - NET_IP_ALIGN);
1963
1964 if (++i == rx_ring->count)
1965 i = 0;
1966 next_rxd = IXGB_RX_DESC(*rx_ring, i);
1967 prefetch(next_rxd);
1968
1969 j = i + 1;
1970 if (j == rx_ring->count)
1971 j = 0;
1972 next2_buffer = &rx_ring->buffer_info[j];
1973 prefetch(next2_buffer);
1974
1975 next_buffer = &rx_ring->buffer_info[i];
1976
1977 cleaned = true;
1978 cleaned_count++;
1979
1980 dma_unmap_single(&pdev->dev,
1981 buffer_info->dma,
1982 buffer_info->length,
1983 DMA_FROM_DEVICE);
1984 buffer_info->dma = 0;
1985
1986 length = le16_to_cpu(rx_desc->length);
1987 rx_desc->length = 0;
1988
1989 if (unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
1990
1991 /* All receives must fit into a single buffer */
1992
1993 pr_debug("Receive packet consumed multiple buffers length<%x>\n",
1994 length);
1995
1996 dev_kfree_skb_irq(skb);
1997 goto rxdesc_done;
1998 }
1999
2000 if (unlikely(rx_desc->errors &
2001 (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE |
2002 IXGB_RX_DESC_ERRORS_P | IXGB_RX_DESC_ERRORS_RXE))) {
2003 dev_kfree_skb_irq(skb);
2004 goto rxdesc_done;
2005 }
2006
2007 ixgb_check_copybreak(&adapter->napi, buffer_info, length, &skb);
2008
2009 /* Good Receive */
2010 skb_put(skb, length);
2011
2012 /* Receive Checksum Offload */
2013 ixgb_rx_checksum(adapter, rx_desc, skb);
2014
2015 skb->protocol = eth_type_trans(skb, netdev);
2016 if (status & IXGB_RX_DESC_STATUS_VP)
2017 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
2018 le16_to_cpu(rx_desc->special));
2019
2020 netif_receive_skb(skb);
2021
2022 rxdesc_done:
2023 /* clean up descriptor, might be written over by hw */
2024 rx_desc->status = 0;
2025
2026 /* return some buffers to hardware, one at a time is too slow */
2027 if (unlikely(cleaned_count >= IXGB_RX_BUFFER_WRITE)) {
2028 ixgb_alloc_rx_buffers(adapter, cleaned_count);
2029 cleaned_count = 0;
2030 }
2031
2032 /* use prefetched values */
2033 rx_desc = next_rxd;
2034 buffer_info = next_buffer;
2035 }
2036
2037 rx_ring->next_to_clean = i;
2038
2039 cleaned_count = IXGB_DESC_UNUSED(rx_ring);
2040 if (cleaned_count)
2041 ixgb_alloc_rx_buffers(adapter, cleaned_count);
2042
2043 return cleaned;
2044 }
2045
2046 /**
2047 * ixgb_alloc_rx_buffers - Replace used receive buffers
2048 * @adapter: address of board private structure
2049 **/
2050
2051 static void
2052 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter, int cleaned_count)
2053 {
2054 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2055 struct net_device *netdev = adapter->netdev;
2056 struct pci_dev *pdev = adapter->pdev;
2057 struct ixgb_rx_desc *rx_desc;
2058 struct ixgb_buffer *buffer_info;
2059 struct sk_buff *skb;
2060 unsigned int i;
2061 long cleancount;
2062
2063 i = rx_ring->next_to_use;
2064 buffer_info = &rx_ring->buffer_info[i];
2065 cleancount = IXGB_DESC_UNUSED(rx_ring);
2066
2067
2068 /* leave three descriptors unused */
2069 while (--cleancount > 2 && cleaned_count--) {
2070 /* recycle! its good for you */
2071 skb = buffer_info->skb;
2072 if (skb) {
2073 skb_trim(skb, 0);
2074 goto map_skb;
2075 }
2076
2077 skb = netdev_alloc_skb_ip_align(netdev, adapter->rx_buffer_len);
2078 if (unlikely(!skb)) {
2079 /* Better luck next round */
2080 adapter->alloc_rx_buff_failed++;
2081 break;
2082 }
2083
2084 buffer_info->skb = skb;
2085 buffer_info->length = adapter->rx_buffer_len;
2086 map_skb:
2087 buffer_info->dma = dma_map_single(&pdev->dev,
2088 skb->data,
2089 adapter->rx_buffer_len,
2090 DMA_FROM_DEVICE);
2091 if (dma_mapping_error(&pdev->dev, buffer_info->dma)) {
2092 adapter->alloc_rx_buff_failed++;
2093 break;
2094 }
2095
2096 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2097 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
2098 /* guarantee DD bit not set now before h/w gets descriptor
2099 * this is the rest of the workaround for h/w double
2100 * writeback. */
2101 rx_desc->status = 0;
2102
2103
2104 if (++i == rx_ring->count)
2105 i = 0;
2106 buffer_info = &rx_ring->buffer_info[i];
2107 }
2108
2109 if (likely(rx_ring->next_to_use != i)) {
2110 rx_ring->next_to_use = i;
2111 if (unlikely(i-- == 0))
2112 i = (rx_ring->count - 1);
2113
2114 /* Force memory writes to complete before letting h/w
2115 * know there are new descriptors to fetch. (Only
2116 * applicable for weak-ordered memory model archs, such
2117 * as IA-64). */
2118 wmb();
2119 IXGB_WRITE_REG(&adapter->hw, RDT, i);
2120 }
2121 }
2122
2123 static void
2124 ixgb_vlan_strip_enable(struct ixgb_adapter *adapter)
2125 {
2126 u32 ctrl;
2127
2128 /* enable VLAN tag insert/strip */
2129 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2130 ctrl |= IXGB_CTRL0_VME;
2131 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2132 }
2133
2134 static void
2135 ixgb_vlan_strip_disable(struct ixgb_adapter *adapter)
2136 {
2137 u32 ctrl;
2138
2139 /* disable VLAN tag insert/strip */
2140 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2141 ctrl &= ~IXGB_CTRL0_VME;
2142 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2143 }
2144
2145 static int
2146 ixgb_vlan_rx_add_vid(struct net_device *netdev, __be16 proto, u16 vid)
2147 {
2148 struct ixgb_adapter *adapter = netdev_priv(netdev);
2149 u32 vfta, index;
2150
2151 /* add VID to filter table */
2152
2153 index = (vid >> 5) & 0x7F;
2154 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2155 vfta |= (1 << (vid & 0x1F));
2156 ixgb_write_vfta(&adapter->hw, index, vfta);
2157 set_bit(vid, adapter->active_vlans);
2158
2159 return 0;
2160 }
2161
2162 static int
2163 ixgb_vlan_rx_kill_vid(struct net_device *netdev, __be16 proto, u16 vid)
2164 {
2165 struct ixgb_adapter *adapter = netdev_priv(netdev);
2166 u32 vfta, index;
2167
2168 /* remove VID from filter table */
2169
2170 index = (vid >> 5) & 0x7F;
2171 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2172 vfta &= ~(1 << (vid & 0x1F));
2173 ixgb_write_vfta(&adapter->hw, index, vfta);
2174 clear_bit(vid, adapter->active_vlans);
2175
2176 return 0;
2177 }
2178
2179 static void
2180 ixgb_restore_vlan(struct ixgb_adapter *adapter)
2181 {
2182 u16 vid;
2183
2184 for_each_set_bit(vid, adapter->active_vlans, VLAN_N_VID)
2185 ixgb_vlan_rx_add_vid(adapter->netdev, htons(ETH_P_8021Q), vid);
2186 }
2187
2188 /**
2189 * ixgb_io_error_detected - called when PCI error is detected
2190 * @pdev: pointer to pci device with error
2191 * @state: pci channel state after error
2192 *
2193 * This callback is called by the PCI subsystem whenever
2194 * a PCI bus error is detected.
2195 */
2196 static pci_ers_result_t ixgb_io_error_detected(struct pci_dev *pdev,
2197 enum pci_channel_state state)
2198 {
2199 struct net_device *netdev = pci_get_drvdata(pdev);
2200 struct ixgb_adapter *adapter = netdev_priv(netdev);
2201
2202 netif_device_detach(netdev);
2203
2204 if (state == pci_channel_io_perm_failure)
2205 return PCI_ERS_RESULT_DISCONNECT;
2206
2207 if (netif_running(netdev))
2208 ixgb_down(adapter, true);
2209
2210 pci_disable_device(pdev);
2211
2212 /* Request a slot reset. */
2213 return PCI_ERS_RESULT_NEED_RESET;
2214 }
2215
2216 /**
2217 * ixgb_io_slot_reset - called after the pci bus has been reset.
2218 * @pdev pointer to pci device with error
2219 *
2220 * This callback is called after the PCI bus has been reset.
2221 * Basically, this tries to restart the card from scratch.
2222 * This is a shortened version of the device probe/discovery code,
2223 * it resembles the first-half of the ixgb_probe() routine.
2224 */
2225 static pci_ers_result_t ixgb_io_slot_reset(struct pci_dev *pdev)
2226 {
2227 struct net_device *netdev = pci_get_drvdata(pdev);
2228 struct ixgb_adapter *adapter = netdev_priv(netdev);
2229
2230 if (pci_enable_device(pdev)) {
2231 netif_err(adapter, probe, adapter->netdev,
2232 "Cannot re-enable PCI device after reset\n");
2233 return PCI_ERS_RESULT_DISCONNECT;
2234 }
2235
2236 /* Perform card reset only on one instance of the card */
2237 if (0 != PCI_FUNC (pdev->devfn))
2238 return PCI_ERS_RESULT_RECOVERED;
2239
2240 pci_set_master(pdev);
2241
2242 netif_carrier_off(netdev);
2243 netif_stop_queue(netdev);
2244 ixgb_reset(adapter);
2245
2246 /* Make sure the EEPROM is good */
2247 if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
2248 netif_err(adapter, probe, adapter->netdev,
2249 "After reset, the EEPROM checksum is not valid\n");
2250 return PCI_ERS_RESULT_DISCONNECT;
2251 }
2252 ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
2253 memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
2254
2255 if (!is_valid_ether_addr(netdev->perm_addr)) {
2256 netif_err(adapter, probe, adapter->netdev,
2257 "After reset, invalid MAC address\n");
2258 return PCI_ERS_RESULT_DISCONNECT;
2259 }
2260
2261 return PCI_ERS_RESULT_RECOVERED;
2262 }
2263
2264 /**
2265 * ixgb_io_resume - called when its OK to resume normal operations
2266 * @pdev pointer to pci device with error
2267 *
2268 * The error recovery driver tells us that its OK to resume
2269 * normal operation. Implementation resembles the second-half
2270 * of the ixgb_probe() routine.
2271 */
2272 static void ixgb_io_resume(struct pci_dev *pdev)
2273 {
2274 struct net_device *netdev = pci_get_drvdata(pdev);
2275 struct ixgb_adapter *adapter = netdev_priv(netdev);
2276
2277 pci_set_master(pdev);
2278
2279 if (netif_running(netdev)) {
2280 if (ixgb_up(adapter)) {
2281 pr_err("can't bring device back up after reset\n");
2282 return;
2283 }
2284 }
2285
2286 netif_device_attach(netdev);
2287 mod_timer(&adapter->watchdog_timer, jiffies);
2288 }
2289
2290 /* ixgb_main.c */
Linux with added FPC-III support