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Merge tag 'v3.3.7' into 3.3/master
[zen-stable.git] / drivers / net / ethernet / intel / ixgb / ixgb_main.c
blob9bd5faf64a85c36a9ad7438cd98588354a88b556
1 /*******************************************************************************
2
3 Intel PRO/10GbE Linux driver
4 Copyright(c) 1999 - 2008 Intel Corporation.
5
6 This program is free software; you can redistribute it and/or modify it
7 under the terms and conditions of the GNU General Public License,
8 version 2, as published by the Free Software Foundation.
9
10 This program is distributed in the hope it will be useful, but WITHOUT
11 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 more details.
14
15 You should have received a copy of the GNU General Public License along with
16 this program; if not, write to the Free Software Foundation, Inc.,
17 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
18
19 The full GNU General Public License is included in this distribution in
20 the file called "COPYING".
21
22 Contact Information:
23 Linux NICS <linux.nics@intel.com>
24 e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
25 Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
26
27 *******************************************************************************/
28
29 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
30
31 #include <linux/prefetch.h>
32 #include "ixgb.h"
33
34 char ixgb_driver_name[] = "ixgb";
35 static char ixgb_driver_string[] = "Intel(R) PRO/10GbE Network Driver";
36
37 #define DRIVERNAPI "-NAPI"
38 #define DRV_VERSION "1.0.135-k2" DRIVERNAPI
39 const char ixgb_driver_version[] = DRV_VERSION;
40 static const char ixgb_copyright[] = "Copyright (c) 1999-2008 Intel Corporation.";
41
42 #define IXGB_CB_LENGTH 256
43 static unsigned int copybreak __read_mostly = IXGB_CB_LENGTH;
44 module_param(copybreak, uint, 0644);
45 MODULE_PARM_DESC(copybreak,
46 "Maximum size of packet that is copied to a new buffer on receive");
47
48 /* ixgb_pci_tbl - PCI Device ID Table
49 *
50 * Wildcard entries (PCI_ANY_ID) should come last
51 * Last entry must be all 0s
52 *
53 * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
54 * Class, Class Mask, private data (not used) }
55 */
56 static DEFINE_PCI_DEVICE_TABLE(ixgb_pci_tbl) = {
57 {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX,
58 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
59 {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_CX4,
60 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
61 {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_SR,
62 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
63 {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_LR,
64 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
65
66 /* required last entry */
67 {0,}
68 };
69
70 MODULE_DEVICE_TABLE(pci, ixgb_pci_tbl);
71
72 /* Local Function Prototypes */
73 static int ixgb_init_module(void);
74 static void ixgb_exit_module(void);
75 static int ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
76 static void __devexit ixgb_remove(struct pci_dev *pdev);
77 static int ixgb_sw_init(struct ixgb_adapter *adapter);
78 static int ixgb_open(struct net_device *netdev);
79 static int ixgb_close(struct net_device *netdev);
80 static void ixgb_configure_tx(struct ixgb_adapter *adapter);
81 static void ixgb_configure_rx(struct ixgb_adapter *adapter);
82 static void ixgb_setup_rctl(struct ixgb_adapter *adapter);
83 static void ixgb_clean_tx_ring(struct ixgb_adapter *adapter);
84 static void ixgb_clean_rx_ring(struct ixgb_adapter *adapter);
85 static void ixgb_set_multi(struct net_device *netdev);
86 static void ixgb_watchdog(unsigned long data);
87 static netdev_tx_t ixgb_xmit_frame(struct sk_buff *skb,
88 struct net_device *netdev);
89 static struct net_device_stats *ixgb_get_stats(struct net_device *netdev);
90 static int ixgb_change_mtu(struct net_device *netdev, int new_mtu);
91 static int ixgb_set_mac(struct net_device *netdev, void *p);
92 static irqreturn_t ixgb_intr(int irq, void *data);
93 static bool ixgb_clean_tx_irq(struct ixgb_adapter *adapter);
94
95 static int ixgb_clean(struct napi_struct *, int);
96 static bool ixgb_clean_rx_irq(struct ixgb_adapter *, int *, int);
97 static void ixgb_alloc_rx_buffers(struct ixgb_adapter *, int);
98
99 static void ixgb_tx_timeout(struct net_device *dev);
100 static void ixgb_tx_timeout_task(struct work_struct *work);
101
102 static void ixgb_vlan_strip_enable(struct ixgb_adapter *adapter);
103 static void ixgb_vlan_strip_disable(struct ixgb_adapter *adapter);
104 static int ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid);
105 static int ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid);
106 static void ixgb_restore_vlan(struct ixgb_adapter *adapter);
107
108 #ifdef CONFIG_NET_POLL_CONTROLLER
109 /* for netdump / net console */
110 static void ixgb_netpoll(struct net_device *dev);
111 #endif
112
113 static pci_ers_result_t ixgb_io_error_detected (struct pci_dev *pdev,
114 enum pci_channel_state state);
115 static pci_ers_result_t ixgb_io_slot_reset (struct pci_dev *pdev);
116 static void ixgb_io_resume (struct pci_dev *pdev);
117
118 static struct pci_error_handlers ixgb_err_handler = {
119 .error_detected = ixgb_io_error_detected,
120 .slot_reset = ixgb_io_slot_reset,
121 .resume = ixgb_io_resume,
122 };
123
124 static struct pci_driver ixgb_driver = {
125 .name = ixgb_driver_name,
126 .id_table = ixgb_pci_tbl,
127 .probe = ixgb_probe,
128 .remove = __devexit_p(ixgb_remove),
129 .err_handler = &ixgb_err_handler
130 };
131
132 MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
133 MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver");
134 MODULE_LICENSE("GPL");
135 MODULE_VERSION(DRV_VERSION);
136
137 #define DEFAULT_DEBUG_LEVEL_SHIFT 3
138 static int debug = DEFAULT_DEBUG_LEVEL_SHIFT;
139 module_param(debug, int, 0);
140 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
141
142 /**
143 * ixgb_init_module - Driver Registration Routine
144 *
145 * ixgb_init_module is the first routine called when the driver is
146 * loaded. All it does is register with the PCI subsystem.
147 **/
148
149 static int __init
150 ixgb_init_module(void)
151 {
152 pr_info("%s - version %s\n", ixgb_driver_string, ixgb_driver_version);
153 pr_info("%s\n", ixgb_copyright);
154
155 return pci_register_driver(&ixgb_driver);
156 }
157
158 module_init(ixgb_init_module);
159
160 /**
161 * ixgb_exit_module - Driver Exit Cleanup Routine
162 *
163 * ixgb_exit_module is called just before the driver is removed
164 * from memory.
165 **/
166
167 static void __exit
168 ixgb_exit_module(void)
169 {
170 pci_unregister_driver(&ixgb_driver);
171 }
172
173 module_exit(ixgb_exit_module);
174
175 /**
176 * ixgb_irq_disable - Mask off interrupt generation on the NIC
177 * @adapter: board private structure
178 **/
179
180 static void
181 ixgb_irq_disable(struct ixgb_adapter *adapter)
182 {
183 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
184 IXGB_WRITE_FLUSH(&adapter->hw);
185 synchronize_irq(adapter->pdev->irq);
186 }
187
188 /**
189 * ixgb_irq_enable - Enable default interrupt generation settings
190 * @adapter: board private structure
191 **/
192
193 static void
194 ixgb_irq_enable(struct ixgb_adapter *adapter)
195 {
196 u32 val = IXGB_INT_RXT0 | IXGB_INT_RXDMT0 |
197 IXGB_INT_TXDW | IXGB_INT_LSC;
198 if (adapter->hw.subsystem_vendor_id == SUN_SUBVENDOR_ID)
199 val |= IXGB_INT_GPI0;
200 IXGB_WRITE_REG(&adapter->hw, IMS, val);
201 IXGB_WRITE_FLUSH(&adapter->hw);
202 }
203
204 int
205 ixgb_up(struct ixgb_adapter *adapter)
206 {
207 struct net_device *netdev = adapter->netdev;
208 int err, irq_flags = IRQF_SHARED;
209 int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
210 struct ixgb_hw *hw = &adapter->hw;
211
212 /* hardware has been reset, we need to reload some things */
213
214 ixgb_rar_set(hw, netdev->dev_addr, 0);
215 ixgb_set_multi(netdev);
216
217 ixgb_restore_vlan(adapter);
218
219 ixgb_configure_tx(adapter);
220 ixgb_setup_rctl(adapter);
221 ixgb_configure_rx(adapter);
222 ixgb_alloc_rx_buffers(adapter, IXGB_DESC_UNUSED(&adapter->rx_ring));
223
224 /* disable interrupts and get the hardware into a known state */
225 IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);
226
227 /* only enable MSI if bus is in PCI-X mode */
228 if (IXGB_READ_REG(&adapter->hw, STATUS) & IXGB_STATUS_PCIX_MODE) {
229 err = pci_enable_msi(adapter->pdev);
230 if (!err) {
231 adapter->have_msi = true;
232 irq_flags = 0;
233 }
234 /* proceed to try to request regular interrupt */
235 }
236
237 err = request_irq(adapter->pdev->irq, ixgb_intr, irq_flags,
238 netdev->name, netdev);
239 if (err) {
240 if (adapter->have_msi)
241 pci_disable_msi(adapter->pdev);
242 netif_err(adapter, probe, adapter->netdev,
243 "Unable to allocate interrupt Error: %d\n", err);
244 return err;
245 }
246
247 if ((hw->max_frame_size != max_frame) ||
248 (hw->max_frame_size !=
249 (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {
250
251 hw->max_frame_size = max_frame;
252
253 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
254
255 if (hw->max_frame_size >
256 IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
257 u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
258
259 if (!(ctrl0 & IXGB_CTRL0_JFE)) {
260 ctrl0 |= IXGB_CTRL0_JFE;
261 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
262 }
263 }
264 }
265
266 clear_bit(__IXGB_DOWN, &adapter->flags);
267
268 napi_enable(&adapter->napi);
269 ixgb_irq_enable(adapter);
270
271 netif_wake_queue(netdev);
272
273 mod_timer(&adapter->watchdog_timer, jiffies);
274
275 return 0;
276 }
277
278 void
279 ixgb_down(struct ixgb_adapter *adapter, bool kill_watchdog)
280 {
281 struct net_device *netdev = adapter->netdev;
282
283 /* prevent the interrupt handler from restarting watchdog */
284 set_bit(__IXGB_DOWN, &adapter->flags);
285
286 napi_disable(&adapter->napi);
287 /* waiting for NAPI to complete can re-enable interrupts */
288 ixgb_irq_disable(adapter);
289 free_irq(adapter->pdev->irq, netdev);
290
291 if (adapter->have_msi)
292 pci_disable_msi(adapter->pdev);
293
294 if (kill_watchdog)
295 del_timer_sync(&adapter->watchdog_timer);
296
297 adapter->link_speed = 0;
298 adapter->link_duplex = 0;
299 netif_carrier_off(netdev);
300 netif_stop_queue(netdev);
301
302 ixgb_reset(adapter);
303 ixgb_clean_tx_ring(adapter);
304 ixgb_clean_rx_ring(adapter);
305 }
306
307 void
308 ixgb_reset(struct ixgb_adapter *adapter)
309 {
310 struct ixgb_hw *hw = &adapter->hw;
311
312 ixgb_adapter_stop(hw);
313 if (!ixgb_init_hw(hw))
314 netif_err(adapter, probe, adapter->netdev, "ixgb_init_hw failed\n");
315
316 /* restore frame size information */
317 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
318 if (hw->max_frame_size >
319 IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
320 u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
321 if (!(ctrl0 & IXGB_CTRL0_JFE)) {
322 ctrl0 |= IXGB_CTRL0_JFE;
323 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
324 }
325 }
326 }
327
328 static netdev_features_t
329 ixgb_fix_features(struct net_device *netdev, netdev_features_t features)
330 {
331 /*
332 * Tx VLAN insertion does not work per HW design when Rx stripping is
333 * disabled.
334 */
335 if (!(features & NETIF_F_HW_VLAN_RX))
336 features &= ~NETIF_F_HW_VLAN_TX;
337
338 return features;
339 }
340
341 static int
342 ixgb_set_features(struct net_device *netdev, netdev_features_t features)
343 {
344 struct ixgb_adapter *adapter = netdev_priv(netdev);
345 netdev_features_t changed = features ^ netdev->features;
346
347 if (!(changed & (NETIF_F_RXCSUM|NETIF_F_HW_VLAN_RX)))
348 return 0;
349
350 adapter->rx_csum = !!(features & NETIF_F_RXCSUM);
351
352 if (netif_running(netdev)) {
353 ixgb_down(adapter, true);
354 ixgb_up(adapter);
355 ixgb_set_speed_duplex(netdev);
356 } else
357 ixgb_reset(adapter);
358
359 return 0;
360 }
361
362
363 static const struct net_device_ops ixgb_netdev_ops = {
364 .ndo_open = ixgb_open,
365 .ndo_stop = ixgb_close,
366 .ndo_start_xmit = ixgb_xmit_frame,
367 .ndo_get_stats = ixgb_get_stats,
368 .ndo_set_rx_mode = ixgb_set_multi,
369 .ndo_validate_addr = eth_validate_addr,
370 .ndo_set_mac_address = ixgb_set_mac,
371 .ndo_change_mtu = ixgb_change_mtu,
372 .ndo_tx_timeout = ixgb_tx_timeout,
373 .ndo_vlan_rx_add_vid = ixgb_vlan_rx_add_vid,
374 .ndo_vlan_rx_kill_vid = ixgb_vlan_rx_kill_vid,
375 #ifdef CONFIG_NET_POLL_CONTROLLER
376 .ndo_poll_controller = ixgb_netpoll,
377 #endif
378 .ndo_fix_features = ixgb_fix_features,
379 .ndo_set_features = ixgb_set_features,
380 };
381
382 /**
383 * ixgb_probe - Device Initialization Routine
384 * @pdev: PCI device information struct
385 * @ent: entry in ixgb_pci_tbl
386 *
387 * Returns 0 on success, negative on failure
388 *
389 * ixgb_probe initializes an adapter identified by a pci_dev structure.
390 * The OS initialization, configuring of the adapter private structure,
391 * and a hardware reset occur.
392 **/
393
394 static int __devinit
395 ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
396 {
397 struct net_device *netdev = NULL;
398 struct ixgb_adapter *adapter;
399 static int cards_found = 0;
400 int pci_using_dac;
401 int i;
402 int err;
403
404 err = pci_enable_device(pdev);
405 if (err)
406 return err;
407
408 pci_using_dac = 0;
409 err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(64));
410 if (!err) {
411 err = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64));
412 if (!err)
413 pci_using_dac = 1;
414 } else {
415 err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
416 if (err) {
417 err = dma_set_coherent_mask(&pdev->dev,
418 DMA_BIT_MASK(32));
419 if (err) {
420 pr_err("No usable DMA configuration, aborting\n");
421 goto err_dma_mask;
422 }
423 }
424 }
425
426 err = pci_request_regions(pdev, ixgb_driver_name);
427 if (err)
428 goto err_request_regions;
429
430 pci_set_master(pdev);
431
432 netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
433 if (!netdev) {
434 err = -ENOMEM;
435 goto err_alloc_etherdev;
436 }
437
438 SET_NETDEV_DEV(netdev, &pdev->dev);
439
440 pci_set_drvdata(pdev, netdev);
441 adapter = netdev_priv(netdev);
442 adapter->netdev = netdev;
443 adapter->pdev = pdev;
444 adapter->hw.back = adapter;
445 adapter->msg_enable = netif_msg_init(debug, DEFAULT_DEBUG_LEVEL_SHIFT);
446
447 adapter->hw.hw_addr = pci_ioremap_bar(pdev, BAR_0);
448 if (!adapter->hw.hw_addr) {
449 err = -EIO;
450 goto err_ioremap;
451 }
452
453 for (i = BAR_1; i <= BAR_5; i++) {
454 if (pci_resource_len(pdev, i) == 0)
455 continue;
456 if (pci_resource_flags(pdev, i) & IORESOURCE_IO) {
457 adapter->hw.io_base = pci_resource_start(pdev, i);
458 break;
459 }
460 }
461
462 netdev->netdev_ops = &ixgb_netdev_ops;
463 ixgb_set_ethtool_ops(netdev);
464 netdev->watchdog_timeo = 5 * HZ;
465 netif_napi_add(netdev, &adapter->napi, ixgb_clean, 64);
466
467 strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
468
469 adapter->bd_number = cards_found;
470 adapter->link_speed = 0;
471 adapter->link_duplex = 0;
472
473 /* setup the private structure */
474
475 err = ixgb_sw_init(adapter);
476 if (err)
477 goto err_sw_init;
478
479 netdev->hw_features = NETIF_F_SG |
480 NETIF_F_TSO |
481 NETIF_F_HW_CSUM |
482 NETIF_F_HW_VLAN_TX |
483 NETIF_F_HW_VLAN_RX;
484 netdev->features = netdev->hw_features |
485 NETIF_F_HW_VLAN_FILTER;
486 netdev->hw_features |= NETIF_F_RXCSUM;
487
488 if (pci_using_dac) {
489 netdev->features |= NETIF_F_HIGHDMA;
490 netdev->vlan_features |= NETIF_F_HIGHDMA;
491 }
492
493 /* make sure the EEPROM is good */
494
495 if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
496 netif_err(adapter, probe, adapter->netdev,
497 "The EEPROM Checksum Is Not Valid\n");
498 err = -EIO;
499 goto err_eeprom;
500 }
501
502 ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
503 memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
504
505 if (!is_valid_ether_addr(netdev->perm_addr)) {
506 netif_err(adapter, probe, adapter->netdev, "Invalid MAC Address\n");
507 err = -EIO;
508 goto err_eeprom;
509 }
510
511 adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
512
513 init_timer(&adapter->watchdog_timer);
514 adapter->watchdog_timer.function = ixgb_watchdog;
515 adapter->watchdog_timer.data = (unsigned long)adapter;
516
517 INIT_WORK(&adapter->tx_timeout_task, ixgb_tx_timeout_task);
518
519 strcpy(netdev->name, "eth%d");
520 err = register_netdev(netdev);
521 if (err)
522 goto err_register;
523
524 /* carrier off reporting is important to ethtool even BEFORE open */
525 netif_carrier_off(netdev);
526
527 netif_info(adapter, probe, adapter->netdev,
528 "Intel(R) PRO/10GbE Network Connection\n");
529 ixgb_check_options(adapter);
530 /* reset the hardware with the new settings */
531
532 ixgb_reset(adapter);
533
534 cards_found++;
535 return 0;
536
537 err_register:
538 err_sw_init:
539 err_eeprom:
540 iounmap(adapter->hw.hw_addr);
541 err_ioremap:
542 free_netdev(netdev);
543 err_alloc_etherdev:
544 pci_release_regions(pdev);
545 err_request_regions:
546 err_dma_mask:
547 pci_disable_device(pdev);
548 return err;
549 }
550
551 /**
552 * ixgb_remove - Device Removal Routine
553 * @pdev: PCI device information struct
554 *
555 * ixgb_remove is called by the PCI subsystem to alert the driver
556 * that it should release a PCI device. The could be caused by a
557 * Hot-Plug event, or because the driver is going to be removed from
558 * memory.
559 **/
560
561 static void __devexit
562 ixgb_remove(struct pci_dev *pdev)
563 {
564 struct net_device *netdev = pci_get_drvdata(pdev);
565 struct ixgb_adapter *adapter = netdev_priv(netdev);
566
567 cancel_work_sync(&adapter->tx_timeout_task);
568
569 unregister_netdev(netdev);
570
571 iounmap(adapter->hw.hw_addr);
572 pci_release_regions(pdev);
573
574 free_netdev(netdev);
575 pci_disable_device(pdev);
576 }
577
578 /**
579 * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
580 * @adapter: board private structure to initialize
581 *
582 * ixgb_sw_init initializes the Adapter private data structure.
583 * Fields are initialized based on PCI device information and
584 * OS network device settings (MTU size).
585 **/
586
587 static int __devinit
588 ixgb_sw_init(struct ixgb_adapter *adapter)
589 {
590 struct ixgb_hw *hw = &adapter->hw;
591 struct net_device *netdev = adapter->netdev;
592 struct pci_dev *pdev = adapter->pdev;
593
594 /* PCI config space info */
595
596 hw->vendor_id = pdev->vendor;
597 hw->device_id = pdev->device;
598 hw->subsystem_vendor_id = pdev->subsystem_vendor;
599 hw->subsystem_id = pdev->subsystem_device;
600
601 hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
602 adapter->rx_buffer_len = hw->max_frame_size + 8; /* + 8 for errata */
603
604 if ((hw->device_id == IXGB_DEVICE_ID_82597EX) ||
605 (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4) ||
606 (hw->device_id == IXGB_DEVICE_ID_82597EX_LR) ||
607 (hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
608 hw->mac_type = ixgb_82597;
609 else {
610 /* should never have loaded on this device */
611 netif_err(adapter, probe, adapter->netdev, "unsupported device id\n");
612 }
613
614 /* enable flow control to be programmed */
615 hw->fc.send_xon = 1;
616
617 set_bit(__IXGB_DOWN, &adapter->flags);
618 return 0;
619 }
620
621 /**
622 * ixgb_open - Called when a network interface is made active
623 * @netdev: network interface device structure
624 *
625 * Returns 0 on success, negative value on failure
626 *
627 * The open entry point is called when a network interface is made
628 * active by the system (IFF_UP). At this point all resources needed
629 * for transmit and receive operations are allocated, the interrupt
630 * handler is registered with the OS, the watchdog timer is started,
631 * and the stack is notified that the interface is ready.
632 **/
633
634 static int
635 ixgb_open(struct net_device *netdev)
636 {
637 struct ixgb_adapter *adapter = netdev_priv(netdev);
638 int err;
639
640 /* allocate transmit descriptors */
641 err = ixgb_setup_tx_resources(adapter);
642 if (err)
643 goto err_setup_tx;
644
645 netif_carrier_off(netdev);
646
647 /* allocate receive descriptors */
648
649 err = ixgb_setup_rx_resources(adapter);
650 if (err)
651 goto err_setup_rx;
652
653 err = ixgb_up(adapter);
654 if (err)
655 goto err_up;
656
657 netif_start_queue(netdev);
658
659 return 0;
660
661 err_up:
662 ixgb_free_rx_resources(adapter);
663 err_setup_rx:
664 ixgb_free_tx_resources(adapter);
665 err_setup_tx:
666 ixgb_reset(adapter);
667
668 return err;
669 }
670
671 /**
672 * ixgb_close - Disables a network interface
673 * @netdev: network interface device structure
674 *
675 * Returns 0, this is not allowed to fail
676 *
677 * The close entry point is called when an interface is de-activated
678 * by the OS. The hardware is still under the drivers control, but
679 * needs to be disabled. A global MAC reset is issued to stop the
680 * hardware, and all transmit and receive resources are freed.
681 **/
682
683 static int
684 ixgb_close(struct net_device *netdev)
685 {
686 struct ixgb_adapter *adapter = netdev_priv(netdev);
687
688 ixgb_down(adapter, true);
689
690 ixgb_free_tx_resources(adapter);
691 ixgb_free_rx_resources(adapter);
692
693 return 0;
694 }
695
696 /**
697 * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
698 * @adapter: board private structure
699 *
700 * Return 0 on success, negative on failure
701 **/
702
703 int
704 ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
705 {
706 struct ixgb_desc_ring *txdr = &adapter->tx_ring;
707 struct pci_dev *pdev = adapter->pdev;
708 int size;
709
710 size = sizeof(struct ixgb_buffer) * txdr->count;
711 txdr->buffer_info = vzalloc(size);
712 if (!txdr->buffer_info) {
713 netif_err(adapter, probe, adapter->netdev,
714 "Unable to allocate transmit descriptor ring memory\n");
715 return -ENOMEM;
716 }
717
718 /* round up to nearest 4K */
719
720 txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
721 txdr->size = ALIGN(txdr->size, 4096);
722
723 txdr->desc = dma_alloc_coherent(&pdev->dev, txdr->size, &txdr->dma,
724 GFP_KERNEL);
725 if (!txdr->desc) {
726 vfree(txdr->buffer_info);
727 netif_err(adapter, probe, adapter->netdev,
728 "Unable to allocate transmit descriptor memory\n");
729 return -ENOMEM;
730 }
731 memset(txdr->desc, 0, txdr->size);
732
733 txdr->next_to_use = 0;
734 txdr->next_to_clean = 0;
735
736 return 0;
737 }
738
739 /**
740 * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
741 * @adapter: board private structure
742 *
743 * Configure the Tx unit of the MAC after a reset.
744 **/
745
746 static void
747 ixgb_configure_tx(struct ixgb_adapter *adapter)
748 {
749 u64 tdba = adapter->tx_ring.dma;
750 u32 tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
751 u32 tctl;
752 struct ixgb_hw *hw = &adapter->hw;
753
754 /* Setup the Base and Length of the Tx Descriptor Ring
755 * tx_ring.dma can be either a 32 or 64 bit value
756 */
757
758 IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
759 IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
760
761 IXGB_WRITE_REG(hw, TDLEN, tdlen);
762
763 /* Setup the HW Tx Head and Tail descriptor pointers */
764
765 IXGB_WRITE_REG(hw, TDH, 0);
766 IXGB_WRITE_REG(hw, TDT, 0);
767
768 /* don't set up txdctl, it induces performance problems if configured
769 * incorrectly */
770 /* Set the Tx Interrupt Delay register */
771
772 IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
773
774 /* Program the Transmit Control Register */
775
776 tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
777 IXGB_WRITE_REG(hw, TCTL, tctl);
778
779 /* Setup Transmit Descriptor Settings for this adapter */
780 adapter->tx_cmd_type =
781 IXGB_TX_DESC_TYPE |
782 (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
783 }
784
785 /**
786 * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
787 * @adapter: board private structure
788 *
789 * Returns 0 on success, negative on failure
790 **/
791
792 int
793 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
794 {
795 struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
796 struct pci_dev *pdev = adapter->pdev;
797 int size;
798
799 size = sizeof(struct ixgb_buffer) * rxdr->count;
800 rxdr->buffer_info = vzalloc(size);
801 if (!rxdr->buffer_info) {
802 netif_err(adapter, probe, adapter->netdev,
803 "Unable to allocate receive descriptor ring\n");
804 return -ENOMEM;
805 }
806
807 /* Round up to nearest 4K */
808
809 rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
810 rxdr->size = ALIGN(rxdr->size, 4096);
811
812 rxdr->desc = dma_alloc_coherent(&pdev->dev, rxdr->size, &rxdr->dma,
813 GFP_KERNEL);
814
815 if (!rxdr->desc) {
816 vfree(rxdr->buffer_info);
817 netif_err(adapter, probe, adapter->netdev,
818 "Unable to allocate receive descriptors\n");
819 return -ENOMEM;
820 }
821 memset(rxdr->desc, 0, rxdr->size);
822
823 rxdr->next_to_clean = 0;
824 rxdr->next_to_use = 0;
825
826 return 0;
827 }
828
829 /**
830 * ixgb_setup_rctl - configure the receive control register
831 * @adapter: Board private structure
832 **/
833
834 static void
835 ixgb_setup_rctl(struct ixgb_adapter *adapter)
836 {
837 u32 rctl;
838
839 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
840
841 rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
842
843 rctl |=
844 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
845 IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
846 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
847
848 rctl |= IXGB_RCTL_SECRC;
849
850 if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048)
851 rctl |= IXGB_RCTL_BSIZE_2048;
852 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096)
853 rctl |= IXGB_RCTL_BSIZE_4096;
854 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192)
855 rctl |= IXGB_RCTL_BSIZE_8192;
856 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384)
857 rctl |= IXGB_RCTL_BSIZE_16384;
858
859 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
860 }
861
862 /**
863 * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
864 * @adapter: board private structure
865 *
866 * Configure the Rx unit of the MAC after a reset.
867 **/
868
869 static void
870 ixgb_configure_rx(struct ixgb_adapter *adapter)
871 {
872 u64 rdba = adapter->rx_ring.dma;
873 u32 rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
874 struct ixgb_hw *hw = &adapter->hw;
875 u32 rctl;
876 u32 rxcsum;
877
878 /* make sure receives are disabled while setting up the descriptors */
879
880 rctl = IXGB_READ_REG(hw, RCTL);
881 IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
882
883 /* set the Receive Delay Timer Register */
884
885 IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
886
887 /* Setup the Base and Length of the Rx Descriptor Ring */
888
889 IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
890 IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
891
892 IXGB_WRITE_REG(hw, RDLEN, rdlen);
893
894 /* Setup the HW Rx Head and Tail Descriptor Pointers */
895 IXGB_WRITE_REG(hw, RDH, 0);
896 IXGB_WRITE_REG(hw, RDT, 0);
897
898 /* due to the hardware errata with RXDCTL, we are unable to use any of
899 * the performance enhancing features of it without causing other
900 * subtle bugs, some of the bugs could include receive length
901 * corruption at high data rates (WTHRESH > 0) and/or receive
902 * descriptor ring irregularites (particularly in hardware cache) */
903 IXGB_WRITE_REG(hw, RXDCTL, 0);
904
905 /* Enable Receive Checksum Offload for TCP and UDP */
906 if (adapter->rx_csum) {
907 rxcsum = IXGB_READ_REG(hw, RXCSUM);
908 rxcsum |= IXGB_RXCSUM_TUOFL;
909 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
910 }
911
912 /* Enable Receives */
913
914 IXGB_WRITE_REG(hw, RCTL, rctl);
915 }
916
917 /**
918 * ixgb_free_tx_resources - Free Tx Resources
919 * @adapter: board private structure
920 *
921 * Free all transmit software resources
922 **/
923
924 void
925 ixgb_free_tx_resources(struct ixgb_adapter *adapter)
926 {
927 struct pci_dev *pdev = adapter->pdev;
928
929 ixgb_clean_tx_ring(adapter);
930
931 vfree(adapter->tx_ring.buffer_info);
932 adapter->tx_ring.buffer_info = NULL;
933
934 dma_free_coherent(&pdev->dev, adapter->tx_ring.size,
935 adapter->tx_ring.desc, adapter->tx_ring.dma);
936
937 adapter->tx_ring.desc = NULL;
938 }
939
940 static void
941 ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
942 struct ixgb_buffer *buffer_info)
943 {
944 if (buffer_info->dma) {
945 if (buffer_info->mapped_as_page)
946 dma_unmap_page(&adapter->pdev->dev, buffer_info->dma,
947 buffer_info->length, DMA_TO_DEVICE);
948 else
949 dma_unmap_single(&adapter->pdev->dev, buffer_info->dma,
950 buffer_info->length, DMA_TO_DEVICE);
951 buffer_info->dma = 0;
952 }
953
954 if (buffer_info->skb) {
955 dev_kfree_skb_any(buffer_info->skb);
956 buffer_info->skb = NULL;
957 }
958 buffer_info->time_stamp = 0;
959 /* these fields must always be initialized in tx
960 * buffer_info->length = 0;
961 * buffer_info->next_to_watch = 0; */
962 }
963
964 /**
965 * ixgb_clean_tx_ring - Free Tx Buffers
966 * @adapter: board private structure
967 **/
968
969 static void
970 ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
971 {
972 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
973 struct ixgb_buffer *buffer_info;
974 unsigned long size;
975 unsigned int i;
976
977 /* Free all the Tx ring sk_buffs */
978
979 for (i = 0; i < tx_ring->count; i++) {
980 buffer_info = &tx_ring->buffer_info[i];
981 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
982 }
983
984 size = sizeof(struct ixgb_buffer) * tx_ring->count;
985 memset(tx_ring->buffer_info, 0, size);
986
987 /* Zero out the descriptor ring */
988
989 memset(tx_ring->desc, 0, tx_ring->size);
990
991 tx_ring->next_to_use = 0;
992 tx_ring->next_to_clean = 0;
993
994 IXGB_WRITE_REG(&adapter->hw, TDH, 0);
995 IXGB_WRITE_REG(&adapter->hw, TDT, 0);
996 }
997
998 /**
999 * ixgb_free_rx_resources - Free Rx Resources
1000 * @adapter: board private structure
1001 *
1002 * Free all receive software resources
1003 **/
1004
1005 void
1006 ixgb_free_rx_resources(struct ixgb_adapter *adapter)
1007 {
1008 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1009 struct pci_dev *pdev = adapter->pdev;
1010
1011 ixgb_clean_rx_ring(adapter);
1012
1013 vfree(rx_ring->buffer_info);
1014 rx_ring->buffer_info = NULL;
1015
1016 dma_free_coherent(&pdev->dev, rx_ring->size, rx_ring->desc,
1017 rx_ring->dma);
1018
1019 rx_ring->desc = NULL;
1020 }
1021
1022 /**
1023 * ixgb_clean_rx_ring - Free Rx Buffers
1024 * @adapter: board private structure
1025 **/
1026
1027 static void
1028 ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
1029 {
1030 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1031 struct ixgb_buffer *buffer_info;
1032 struct pci_dev *pdev = adapter->pdev;
1033 unsigned long size;
1034 unsigned int i;
1035
1036 /* Free all the Rx ring sk_buffs */
1037
1038 for (i = 0; i < rx_ring->count; i++) {
1039 buffer_info = &rx_ring->buffer_info[i];
1040 if (buffer_info->dma) {
1041 dma_unmap_single(&pdev->dev,
1042 buffer_info->dma,
1043 buffer_info->length,
1044 DMA_FROM_DEVICE);
1045 buffer_info->dma = 0;
1046 buffer_info->length = 0;
1047 }
1048
1049 if (buffer_info->skb) {
1050 dev_kfree_skb(buffer_info->skb);
1051 buffer_info->skb = NULL;
1052 }
1053 }
1054
1055 size = sizeof(struct ixgb_buffer) * rx_ring->count;
1056 memset(rx_ring->buffer_info, 0, size);
1057
1058 /* Zero out the descriptor ring */
1059
1060 memset(rx_ring->desc, 0, rx_ring->size);
1061
1062 rx_ring->next_to_clean = 0;
1063 rx_ring->next_to_use = 0;
1064
1065 IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1066 IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1067 }
1068
1069 /**
1070 * ixgb_set_mac - Change the Ethernet Address of the NIC
1071 * @netdev: network interface device structure
1072 * @p: pointer to an address structure
1073 *
1074 * Returns 0 on success, negative on failure
1075 **/
1076
1077 static int
1078 ixgb_set_mac(struct net_device *netdev, void *p)
1079 {
1080 struct ixgb_adapter *adapter = netdev_priv(netdev);
1081 struct sockaddr *addr = p;
1082
1083 if (!is_valid_ether_addr(addr->sa_data))
1084 return -EADDRNOTAVAIL;
1085
1086 memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1087
1088 ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1089
1090 return 0;
1091 }
1092
1093 /**
1094 * ixgb_set_multi - Multicast and Promiscuous mode set
1095 * @netdev: network interface device structure
1096 *
1097 * The set_multi entry point is called whenever the multicast address
1098 * list or the network interface flags are updated. This routine is
1099 * responsible for configuring the hardware for proper multicast,
1100 * promiscuous mode, and all-multi behavior.
1101 **/
1102
1103 static void
1104 ixgb_set_multi(struct net_device *netdev)
1105 {
1106 struct ixgb_adapter *adapter = netdev_priv(netdev);
1107 struct ixgb_hw *hw = &adapter->hw;
1108 struct netdev_hw_addr *ha;
1109 u32 rctl;
1110
1111 /* Check for Promiscuous and All Multicast modes */
1112
1113 rctl = IXGB_READ_REG(hw, RCTL);
1114
1115 if (netdev->flags & IFF_PROMISC) {
1116 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1117 /* disable VLAN filtering */
1118 rctl &= ~IXGB_RCTL_CFIEN;
1119 rctl &= ~IXGB_RCTL_VFE;
1120 } else {
1121 if (netdev->flags & IFF_ALLMULTI) {
1122 rctl |= IXGB_RCTL_MPE;
1123 rctl &= ~IXGB_RCTL_UPE;
1124 } else {
1125 rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1126 }
1127 /* enable VLAN filtering */
1128 rctl |= IXGB_RCTL_VFE;
1129 rctl &= ~IXGB_RCTL_CFIEN;
1130 }
1131
1132 if (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1133 rctl |= IXGB_RCTL_MPE;
1134 IXGB_WRITE_REG(hw, RCTL, rctl);
1135 } else {
1136 u8 *mta = kmalloc(IXGB_MAX_NUM_MULTICAST_ADDRESSES *
1137 ETH_ALEN, GFP_ATOMIC);
1138 u8 *addr;
1139 if (!mta) {
1140 pr_err("allocation of multicast memory failed\n");
1141 goto alloc_failed;
1142 }
1143
1144 IXGB_WRITE_REG(hw, RCTL, rctl);
1145
1146 addr = mta;
1147 netdev_for_each_mc_addr(ha, netdev) {
1148 memcpy(addr, ha->addr, ETH_ALEN);
1149 addr += ETH_ALEN;
1150 }
1151
1152 ixgb_mc_addr_list_update(hw, mta, netdev_mc_count(netdev), 0);
1153 kfree(mta);
1154 }
1155
1156 alloc_failed:
1157 if (netdev->features & NETIF_F_HW_VLAN_RX)
1158 ixgb_vlan_strip_enable(adapter);
1159 else
1160 ixgb_vlan_strip_disable(adapter);
1161
1162 }
1163
1164 /**
1165 * ixgb_watchdog - Timer Call-back
1166 * @data: pointer to netdev cast into an unsigned long
1167 **/
1168
1169 static void
1170 ixgb_watchdog(unsigned long data)
1171 {
1172 struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
1173 struct net_device *netdev = adapter->netdev;
1174 struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1175
1176 ixgb_check_for_link(&adapter->hw);
1177
1178 if (ixgb_check_for_bad_link(&adapter->hw)) {
1179 /* force the reset path */
1180 netif_stop_queue(netdev);
1181 }
1182
1183 if (adapter->hw.link_up) {
1184 if (!netif_carrier_ok(netdev)) {
1185 netdev_info(netdev,
1186 "NIC Link is Up 10 Gbps Full Duplex, Flow Control: %s\n",
1187 (adapter->hw.fc.type == ixgb_fc_full) ?
1188 "RX/TX" :
1189 (adapter->hw.fc.type == ixgb_fc_rx_pause) ?
1190 "RX" :
1191 (adapter->hw.fc.type == ixgb_fc_tx_pause) ?
1192 "TX" : "None");
1193 adapter->link_speed = 10000;
1194 adapter->link_duplex = FULL_DUPLEX;
1195 netif_carrier_on(netdev);
1196 }
1197 } else {
1198 if (netif_carrier_ok(netdev)) {
1199 adapter->link_speed = 0;
1200 adapter->link_duplex = 0;
1201 netdev_info(netdev, "NIC Link is Down\n");
1202 netif_carrier_off(netdev);
1203 }
1204 }
1205
1206 ixgb_update_stats(adapter);
1207
1208 if (!netif_carrier_ok(netdev)) {
1209 if (IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1210 /* We've lost link, so the controller stops DMA,
1211 * but we've got queued Tx work that's never going
1212 * to get done, so reset controller to flush Tx.
1213 * (Do the reset outside of interrupt context). */
1214 schedule_work(&adapter->tx_timeout_task);
1215 /* return immediately since reset is imminent */
1216 return;
1217 }
1218 }
1219
1220 /* Force detection of hung controller every watchdog period */
1221 adapter->detect_tx_hung = true;
1222
1223 /* generate an interrupt to force clean up of any stragglers */
1224 IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1225
1226 /* Reset the timer */
1227 mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1228 }
1229
1230 #define IXGB_TX_FLAGS_CSUM 0x00000001
1231 #define IXGB_TX_FLAGS_VLAN 0x00000002
1232 #define IXGB_TX_FLAGS_TSO 0x00000004
1233
1234 static int
1235 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1236 {
1237 struct ixgb_context_desc *context_desc;
1238 unsigned int i;
1239 u8 ipcss, ipcso, tucss, tucso, hdr_len;
1240 u16 ipcse, tucse, mss;
1241 int err;
1242
1243 if (likely(skb_is_gso(skb))) {
1244 struct ixgb_buffer *buffer_info;
1245 struct iphdr *iph;
1246
1247 if (skb_header_cloned(skb)) {
1248 err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1249 if (err)
1250 return err;
1251 }
1252
1253 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
1254 mss = skb_shinfo(skb)->gso_size;
1255 iph = ip_hdr(skb);
1256 iph->tot_len = 0;
1257 iph->check = 0;
1258 tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
1259 iph->daddr, 0,
1260 IPPROTO_TCP, 0);
1261 ipcss = skb_network_offset(skb);
1262 ipcso = (void *)&(iph->check) - (void *)skb->data;
1263 ipcse = skb_transport_offset(skb) - 1;
1264 tucss = skb_transport_offset(skb);
1265 tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data;
1266 tucse = 0;
1267
1268 i = adapter->tx_ring.next_to_use;
1269 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1270 buffer_info = &adapter->tx_ring.buffer_info[i];
1271 WARN_ON(buffer_info->dma != 0);
1272
1273 context_desc->ipcss = ipcss;
1274 context_desc->ipcso = ipcso;
1275 context_desc->ipcse = cpu_to_le16(ipcse);
1276 context_desc->tucss = tucss;
1277 context_desc->tucso = tucso;
1278 context_desc->tucse = cpu_to_le16(tucse);
1279 context_desc->mss = cpu_to_le16(mss);
1280 context_desc->hdr_len = hdr_len;
1281 context_desc->status = 0;
1282 context_desc->cmd_type_len = cpu_to_le32(
1283 IXGB_CONTEXT_DESC_TYPE
1284 | IXGB_CONTEXT_DESC_CMD_TSE
1285 | IXGB_CONTEXT_DESC_CMD_IP
1286 | IXGB_CONTEXT_DESC_CMD_TCP
1287 | IXGB_CONTEXT_DESC_CMD_IDE
1288 | (skb->len - (hdr_len)));
1289
1290
1291 if (++i == adapter->tx_ring.count) i = 0;
1292 adapter->tx_ring.next_to_use = i;
1293
1294 return 1;
1295 }
1296
1297 return 0;
1298 }
1299
1300 static bool
1301 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1302 {
1303 struct ixgb_context_desc *context_desc;
1304 unsigned int i;
1305 u8 css, cso;
1306
1307 if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
1308 struct ixgb_buffer *buffer_info;
1309 css = skb_checksum_start_offset(skb);
1310 cso = css + skb->csum_offset;
1311
1312 i = adapter->tx_ring.next_to_use;
1313 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1314 buffer_info = &adapter->tx_ring.buffer_info[i];
1315 WARN_ON(buffer_info->dma != 0);
1316
1317 context_desc->tucss = css;
1318 context_desc->tucso = cso;
1319 context_desc->tucse = 0;
1320 /* zero out any previously existing data in one instruction */
1321 *(u32 *)&(context_desc->ipcss) = 0;
1322 context_desc->status = 0;
1323 context_desc->hdr_len = 0;
1324 context_desc->mss = 0;
1325 context_desc->cmd_type_len =
1326 cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1327 | IXGB_TX_DESC_CMD_IDE);
1328
1329 if (++i == adapter->tx_ring.count) i = 0;
1330 adapter->tx_ring.next_to_use = i;
1331
1332 return true;
1333 }
1334
1335 return false;
1336 }
1337
1338 #define IXGB_MAX_TXD_PWR 14
1339 #define IXGB_MAX_DATA_PER_TXD (1<<IXGB_MAX_TXD_PWR)
1340
1341 static int
1342 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1343 unsigned int first)
1344 {
1345 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1346 struct pci_dev *pdev = adapter->pdev;
1347 struct ixgb_buffer *buffer_info;
1348 int len = skb_headlen(skb);
1349 unsigned int offset = 0, size, count = 0, i;
1350 unsigned int mss = skb_shinfo(skb)->gso_size;
1351 unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1352 unsigned int f;
1353
1354 i = tx_ring->next_to_use;
1355
1356 while (len) {
1357 buffer_info = &tx_ring->buffer_info[i];
1358 size = min(len, IXGB_MAX_DATA_PER_TXD);
1359 /* Workaround for premature desc write-backs
1360 * in TSO mode. Append 4-byte sentinel desc */
1361 if (unlikely(mss && !nr_frags && size == len && size > 8))
1362 size -= 4;
1363
1364 buffer_info->length = size;
1365 WARN_ON(buffer_info->dma != 0);
1366 buffer_info->time_stamp = jiffies;
1367 buffer_info->mapped_as_page = false;
1368 buffer_info->dma = dma_map_single(&pdev->dev,
1369 skb->data + offset,
1370 size, DMA_TO_DEVICE);
1371 if (dma_mapping_error(&pdev->dev, buffer_info->dma))
1372 goto dma_error;
1373 buffer_info->next_to_watch = 0;
1374
1375 len -= size;
1376 offset += size;
1377 count++;
1378 if (len) {
1379 i++;
1380 if (i == tx_ring->count)
1381 i = 0;
1382 }
1383 }
1384
1385 for (f = 0; f < nr_frags; f++) {
1386 const struct skb_frag_struct *frag;
1387
1388 frag = &skb_shinfo(skb)->frags[f];
1389 len = skb_frag_size(frag);
1390 offset = 0;
1391
1392 while (len) {
1393 i++;
1394 if (i == tx_ring->count)
1395 i = 0;
1396
1397 buffer_info = &tx_ring->buffer_info[i];
1398 size = min(len, IXGB_MAX_DATA_PER_TXD);
1399
1400 /* Workaround for premature desc write-backs
1401 * in TSO mode. Append 4-byte sentinel desc */
1402 if (unlikely(mss && (f == (nr_frags - 1))
1403 && size == len && size > 8))
1404 size -= 4;
1405
1406 buffer_info->length = size;
1407 buffer_info->time_stamp = jiffies;
1408 buffer_info->mapped_as_page = true;
1409 buffer_info->dma =
1410 skb_frag_dma_map(&pdev->dev, frag, offset, size,
1411 DMA_TO_DEVICE);
1412 if (dma_mapping_error(&pdev->dev, buffer_info->dma))
1413 goto dma_error;
1414 buffer_info->next_to_watch = 0;
1415
1416 len -= size;
1417 offset += size;
1418 count++;
1419 }
1420 }
1421 tx_ring->buffer_info[i].skb = skb;
1422 tx_ring->buffer_info[first].next_to_watch = i;
1423
1424 return count;
1425
1426 dma_error:
1427 dev_err(&pdev->dev, "TX DMA map failed\n");
1428 buffer_info->dma = 0;
1429 if (count)
1430 count--;
1431
1432 while (count--) {
1433 if (i==0)
1434 i += tx_ring->count;
1435 i--;
1436 buffer_info = &tx_ring->buffer_info[i];
1437 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1438 }
1439
1440 return 0;
1441 }
1442
1443 static void
1444 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1445 {
1446 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1447 struct ixgb_tx_desc *tx_desc = NULL;
1448 struct ixgb_buffer *buffer_info;
1449 u32 cmd_type_len = adapter->tx_cmd_type;
1450 u8 status = 0;
1451 u8 popts = 0;
1452 unsigned int i;
1453
1454 if (tx_flags & IXGB_TX_FLAGS_TSO) {
1455 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1456 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1457 }
1458
1459 if (tx_flags & IXGB_TX_FLAGS_CSUM)
1460 popts |= IXGB_TX_DESC_POPTS_TXSM;
1461
1462 if (tx_flags & IXGB_TX_FLAGS_VLAN)
1463 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1464
1465 i = tx_ring->next_to_use;
1466
1467 while (count--) {
1468 buffer_info = &tx_ring->buffer_info[i];
1469 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1470 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1471 tx_desc->cmd_type_len =
1472 cpu_to_le32(cmd_type_len | buffer_info->length);
1473 tx_desc->status = status;
1474 tx_desc->popts = popts;
1475 tx_desc->vlan = cpu_to_le16(vlan_id);
1476
1477 if (++i == tx_ring->count) i = 0;
1478 }
1479
1480 tx_desc->cmd_type_len |=
1481 cpu_to_le32(IXGB_TX_DESC_CMD_EOP | IXGB_TX_DESC_CMD_RS);
1482
1483 /* Force memory writes to complete before letting h/w
1484 * know there are new descriptors to fetch. (Only
1485 * applicable for weak-ordered memory model archs,
1486 * such as IA-64). */
1487 wmb();
1488
1489 tx_ring->next_to_use = i;
1490 IXGB_WRITE_REG(&adapter->hw, TDT, i);
1491 }
1492
1493 static int __ixgb_maybe_stop_tx(struct net_device *netdev, int size)
1494 {
1495 struct ixgb_adapter *adapter = netdev_priv(netdev);
1496 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1497
1498 netif_stop_queue(netdev);
1499 /* Herbert's original patch had:
1500 * smp_mb__after_netif_stop_queue();
1501 * but since that doesn't exist yet, just open code it. */
1502 smp_mb();
1503
1504 /* We need to check again in a case another CPU has just
1505 * made room available. */
1506 if (likely(IXGB_DESC_UNUSED(tx_ring) < size))
1507 return -EBUSY;
1508
1509 /* A reprieve! */
1510 netif_start_queue(netdev);
1511 ++adapter->restart_queue;
1512 return 0;
1513 }
1514
1515 static int ixgb_maybe_stop_tx(struct net_device *netdev,
1516 struct ixgb_desc_ring *tx_ring, int size)
1517 {
1518 if (likely(IXGB_DESC_UNUSED(tx_ring) >= size))
1519 return 0;
1520 return __ixgb_maybe_stop_tx(netdev, size);
1521 }
1522
1523
1524 /* Tx Descriptors needed, worst case */
1525 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1526 (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1527 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) /* skb->date */ + \
1528 MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 /* for context */ \
1529 + 1 /* one more needed for sentinel TSO workaround */
1530
1531 static netdev_tx_t
1532 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1533 {
1534 struct ixgb_adapter *adapter = netdev_priv(netdev);
1535 unsigned int first;
1536 unsigned int tx_flags = 0;
1537 int vlan_id = 0;
1538 int count = 0;
1539 int tso;
1540
1541 if (test_bit(__IXGB_DOWN, &adapter->flags)) {
1542 dev_kfree_skb(skb);
1543 return NETDEV_TX_OK;
1544 }
1545
1546 if (skb->len <= 0) {
1547 dev_kfree_skb(skb);
1548 return NETDEV_TX_OK;
1549 }
1550
1551 if (unlikely(ixgb_maybe_stop_tx(netdev, &adapter->tx_ring,
1552 DESC_NEEDED)))
1553 return NETDEV_TX_BUSY;
1554
1555 if (vlan_tx_tag_present(skb)) {
1556 tx_flags |= IXGB_TX_FLAGS_VLAN;
1557 vlan_id = vlan_tx_tag_get(skb);
1558 }
1559
1560 first = adapter->tx_ring.next_to_use;
1561
1562 tso = ixgb_tso(adapter, skb);
1563 if (tso < 0) {
1564 dev_kfree_skb(skb);
1565 return NETDEV_TX_OK;
1566 }
1567
1568 if (likely(tso))
1569 tx_flags |= IXGB_TX_FLAGS_TSO;
1570 else if (ixgb_tx_csum(adapter, skb))
1571 tx_flags |= IXGB_TX_FLAGS_CSUM;
1572
1573 count = ixgb_tx_map(adapter, skb, first);
1574
1575 if (count) {
1576 ixgb_tx_queue(adapter, count, vlan_id, tx_flags);
1577 /* Make sure there is space in the ring for the next send. */
1578 ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED);
1579
1580 } else {
1581 dev_kfree_skb_any(skb);
1582 adapter->tx_ring.buffer_info[first].time_stamp = 0;
1583 adapter->tx_ring.next_to_use = first;
1584 }
1585
1586 return NETDEV_TX_OK;
1587 }
1588
1589 /**
1590 * ixgb_tx_timeout - Respond to a Tx Hang
1591 * @netdev: network interface device structure
1592 **/
1593
1594 static void
1595 ixgb_tx_timeout(struct net_device *netdev)
1596 {
1597 struct ixgb_adapter *adapter = netdev_priv(netdev);
1598
1599 /* Do the reset outside of interrupt context */
1600 schedule_work(&adapter->tx_timeout_task);
1601 }
1602
1603 static void
1604 ixgb_tx_timeout_task(struct work_struct *work)
1605 {
1606 struct ixgb_adapter *adapter =
1607 container_of(work, struct ixgb_adapter, tx_timeout_task);
1608
1609 adapter->tx_timeout_count++;
1610 ixgb_down(adapter, true);
1611 ixgb_up(adapter);
1612 }
1613
1614 /**
1615 * ixgb_get_stats - Get System Network Statistics
1616 * @netdev: network interface device structure
1617 *
1618 * Returns the address of the device statistics structure.
1619 * The statistics are actually updated from the timer callback.
1620 **/
1621
1622 static struct net_device_stats *
1623 ixgb_get_stats(struct net_device *netdev)
1624 {
1625 return &netdev->stats;
1626 }
1627
1628 /**
1629 * ixgb_change_mtu - Change the Maximum Transfer Unit
1630 * @netdev: network interface device structure
1631 * @new_mtu: new value for maximum frame size
1632 *
1633 * Returns 0 on success, negative on failure
1634 **/
1635
1636 static int
1637 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1638 {
1639 struct ixgb_adapter *adapter = netdev_priv(netdev);
1640 int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1641 int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1642
1643 /* MTU < 68 is an error for IPv4 traffic, just don't allow it */
1644 if ((new_mtu < 68) ||
1645 (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
1646 netif_err(adapter, probe, adapter->netdev,
1647 "Invalid MTU setting %d\n", new_mtu);
1648 return -EINVAL;
1649 }
1650
1651 if (old_max_frame == max_frame)
1652 return 0;
1653
1654 if (netif_running(netdev))
1655 ixgb_down(adapter, true);
1656
1657 adapter->rx_buffer_len = max_frame + 8; /* + 8 for errata */
1658
1659 netdev->mtu = new_mtu;
1660
1661 if (netif_running(netdev))
1662 ixgb_up(adapter);
1663
1664 return 0;
1665 }
1666
1667 /**
1668 * ixgb_update_stats - Update the board statistics counters.
1669 * @adapter: board private structure
1670 **/
1671
1672 void
1673 ixgb_update_stats(struct ixgb_adapter *adapter)
1674 {
1675 struct net_device *netdev = adapter->netdev;
1676 struct pci_dev *pdev = adapter->pdev;
1677
1678 /* Prevent stats update while adapter is being reset */
1679 if (pci_channel_offline(pdev))
1680 return;
1681
1682 if ((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1683 (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1684 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1685 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1686 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1687 u64 bcast = ((u64)bcast_h << 32) | bcast_l;
1688
1689 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1690 /* fix up multicast stats by removing broadcasts */
1691 if (multi >= bcast)
1692 multi -= bcast;
1693
1694 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1695 adapter->stats.mprch += (multi >> 32);
1696 adapter->stats.bprcl += bcast_l;
1697 adapter->stats.bprch += bcast_h;
1698 } else {
1699 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1700 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1701 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1702 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1703 }
1704 adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1705 adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1706 adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1707 adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1708 adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1709 adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1710 adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1711 adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1712 adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1713 adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1714 adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1715 adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1716 adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1717 adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1718 adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1719 adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1720 adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1721 adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1722 adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1723 adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1724 adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1725 adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1726 adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1727 adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1728 adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1729 adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1730 adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1731 adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1732 adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1733 adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1734 adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1735 adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1736 adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1737 adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1738 adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1739 adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1740 adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1741 adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1742 adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1743 adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1744 adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1745 adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1746 adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1747 adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1748 adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1749 adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1750 adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1751 adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1752 adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1753 adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1754 adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1755 adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1756 adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1757 adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1758 adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1759 adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1760
1761 /* Fill out the OS statistics structure */
1762
1763 netdev->stats.rx_packets = adapter->stats.gprcl;
1764 netdev->stats.tx_packets = adapter->stats.gptcl;
1765 netdev->stats.rx_bytes = adapter->stats.gorcl;
1766 netdev->stats.tx_bytes = adapter->stats.gotcl;
1767 netdev->stats.multicast = adapter->stats.mprcl;
1768 netdev->stats.collisions = 0;
1769
1770 /* ignore RLEC as it reports errors for padded (<64bytes) frames
1771 * with a length in the type/len field */
1772 netdev->stats.rx_errors =
1773 /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1774 adapter->stats.ruc +
1775 adapter->stats.roc /*+ adapter->stats.rlec */ +
1776 adapter->stats.icbc +
1777 adapter->stats.ecbc + adapter->stats.mpc;
1778
1779 /* see above
1780 * netdev->stats.rx_length_errors = adapter->stats.rlec;
1781 */
1782
1783 netdev->stats.rx_crc_errors = adapter->stats.crcerrs;
1784 netdev->stats.rx_fifo_errors = adapter->stats.mpc;
1785 netdev->stats.rx_missed_errors = adapter->stats.mpc;
1786 netdev->stats.rx_over_errors = adapter->stats.mpc;
1787
1788 netdev->stats.tx_errors = 0;
1789 netdev->stats.rx_frame_errors = 0;
1790 netdev->stats.tx_aborted_errors = 0;
1791 netdev->stats.tx_carrier_errors = 0;
1792 netdev->stats.tx_fifo_errors = 0;
1793 netdev->stats.tx_heartbeat_errors = 0;
1794 netdev->stats.tx_window_errors = 0;
1795 }
1796
1797 #define IXGB_MAX_INTR 10
1798 /**
1799 * ixgb_intr - Interrupt Handler
1800 * @irq: interrupt number
1801 * @data: pointer to a network interface device structure
1802 **/
1803
1804 static irqreturn_t
1805 ixgb_intr(int irq, void *data)
1806 {
1807 struct net_device *netdev = data;
1808 struct ixgb_adapter *adapter = netdev_priv(netdev);
1809 struct ixgb_hw *hw = &adapter->hw;
1810 u32 icr = IXGB_READ_REG(hw, ICR);
1811
1812 if (unlikely(!icr))
1813 return IRQ_NONE; /* Not our interrupt */
1814
1815 if (unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC)))
1816 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1817 mod_timer(&adapter->watchdog_timer, jiffies);
1818
1819 if (napi_schedule_prep(&adapter->napi)) {
1820
1821 /* Disable interrupts and register for poll. The flush
1822 of the posted write is intentionally left out.
1823 */
1824
1825 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1826 __napi_schedule(&adapter->napi);
1827 }
1828 return IRQ_HANDLED;
1829 }
1830
1831 /**
1832 * ixgb_clean - NAPI Rx polling callback
1833 * @adapter: board private structure
1834 **/
1835
1836 static int
1837 ixgb_clean(struct napi_struct *napi, int budget)
1838 {
1839 struct ixgb_adapter *adapter = container_of(napi, struct ixgb_adapter, napi);
1840 int work_done = 0;
1841
1842 ixgb_clean_tx_irq(adapter);
1843 ixgb_clean_rx_irq(adapter, &work_done, budget);
1844
1845 /* If budget not fully consumed, exit the polling mode */
1846 if (work_done < budget) {
1847 napi_complete(napi);
1848 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1849 ixgb_irq_enable(adapter);
1850 }
1851
1852 return work_done;
1853 }
1854
1855 /**
1856 * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1857 * @adapter: board private structure
1858 **/
1859
1860 static bool
1861 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1862 {
1863 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1864 struct net_device *netdev = adapter->netdev;
1865 struct ixgb_tx_desc *tx_desc, *eop_desc;
1866 struct ixgb_buffer *buffer_info;
1867 unsigned int i, eop;
1868 bool cleaned = false;
1869
1870 i = tx_ring->next_to_clean;
1871 eop = tx_ring->buffer_info[i].next_to_watch;
1872 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1873
1874 while (eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1875
1876 rmb(); /* read buffer_info after eop_desc */
1877 for (cleaned = false; !cleaned; ) {
1878 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1879 buffer_info = &tx_ring->buffer_info[i];
1880
1881 if (tx_desc->popts &
1882 (IXGB_TX_DESC_POPTS_TXSM |
1883 IXGB_TX_DESC_POPTS_IXSM))
1884 adapter->hw_csum_tx_good++;
1885
1886 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1887
1888 *(u32 *)&(tx_desc->status) = 0;
1889
1890 cleaned = (i == eop);
1891 if (++i == tx_ring->count) i = 0;
1892 }
1893
1894 eop = tx_ring->buffer_info[i].next_to_watch;
1895 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1896 }
1897
1898 tx_ring->next_to_clean = i;
1899
1900 if (unlikely(cleaned && netif_carrier_ok(netdev) &&
1901 IXGB_DESC_UNUSED(tx_ring) >= DESC_NEEDED)) {
1902 /* Make sure that anybody stopping the queue after this
1903 * sees the new next_to_clean. */
1904 smp_mb();
1905
1906 if (netif_queue_stopped(netdev) &&
1907 !(test_bit(__IXGB_DOWN, &adapter->flags))) {
1908 netif_wake_queue(netdev);
1909 ++adapter->restart_queue;
1910 }
1911 }
1912
1913 if (adapter->detect_tx_hung) {
1914 /* detect a transmit hang in hardware, this serializes the
1915 * check with the clearing of time_stamp and movement of i */
1916 adapter->detect_tx_hung = false;
1917 if (tx_ring->buffer_info[eop].time_stamp &&
1918 time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ)
1919 && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1920 IXGB_STATUS_TXOFF)) {
1921 /* detected Tx unit hang */
1922 netif_err(adapter, drv, adapter->netdev,
1923 "Detected Tx Unit Hang\n"
1924 " TDH <%x>\n"
1925 " TDT <%x>\n"
1926 " next_to_use <%x>\n"
1927 " next_to_clean <%x>\n"
1928 "buffer_info[next_to_clean]\n"
1929 " time_stamp <%lx>\n"
1930 " next_to_watch <%x>\n"
1931 " jiffies <%lx>\n"
1932 " next_to_watch.status <%x>\n",
1933 IXGB_READ_REG(&adapter->hw, TDH),
1934 IXGB_READ_REG(&adapter->hw, TDT),
1935 tx_ring->next_to_use,
1936 tx_ring->next_to_clean,
1937 tx_ring->buffer_info[eop].time_stamp,
1938 eop,
1939 jiffies,
1940 eop_desc->status);
1941 netif_stop_queue(netdev);
1942 }
1943 }
1944
1945 return cleaned;
1946 }
1947
1948 /**
1949 * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1950 * @adapter: board private structure
1951 * @rx_desc: receive descriptor
1952 * @sk_buff: socket buffer with received data
1953 **/
1954
1955 static void
1956 ixgb_rx_checksum(struct ixgb_adapter *adapter,
1957 struct ixgb_rx_desc *rx_desc,
1958 struct sk_buff *skb)
1959 {
1960 /* Ignore Checksum bit is set OR
1961 * TCP Checksum has not been calculated
1962 */
1963 if ((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1964 (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1965 skb_checksum_none_assert(skb);
1966 return;
1967 }
1968
1969 /* At this point we know the hardware did the TCP checksum */
1970 /* now look at the TCP checksum error bit */
1971 if (rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1972 /* let the stack verify checksum errors */
1973 skb_checksum_none_assert(skb);
1974 adapter->hw_csum_rx_error++;
1975 } else {
1976 /* TCP checksum is good */
1977 skb->ip_summed = CHECKSUM_UNNECESSARY;
1978 adapter->hw_csum_rx_good++;
1979 }
1980 }
1981
1982 /*
1983 * this should improve performance for small packets with large amounts
1984 * of reassembly being done in the stack
1985 */
1986 static void ixgb_check_copybreak(struct net_device *netdev,
1987 struct ixgb_buffer *buffer_info,
1988 u32 length, struct sk_buff **skb)
1989 {
1990 struct sk_buff *new_skb;
1991
1992 if (length > copybreak)
1993 return;
1994
1995 new_skb = netdev_alloc_skb_ip_align(netdev, length);
1996 if (!new_skb)
1997 return;
1998
1999 skb_copy_to_linear_data_offset(new_skb, -NET_IP_ALIGN,
2000 (*skb)->data - NET_IP_ALIGN,
2001 length + NET_IP_ALIGN);
2002 /* save the skb in buffer_info as good */
2003 buffer_info->skb = *skb;
2004 *skb = new_skb;
2005 }
2006
2007 /**
2008 * ixgb_clean_rx_irq - Send received data up the network stack,
2009 * @adapter: board private structure
2010 **/
2011
2012 static bool
2013 ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
2014 {
2015 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2016 struct net_device *netdev = adapter->netdev;
2017 struct pci_dev *pdev = adapter->pdev;
2018 struct ixgb_rx_desc *rx_desc, *next_rxd;
2019 struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
2020 u32 length;
2021 unsigned int i, j;
2022 int cleaned_count = 0;
2023 bool cleaned = false;
2024
2025 i = rx_ring->next_to_clean;
2026 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2027 buffer_info = &rx_ring->buffer_info[i];
2028
2029 while (rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
2030 struct sk_buff *skb;
2031 u8 status;
2032
2033 if (*work_done >= work_to_do)
2034 break;
2035
2036 (*work_done)++;
2037 rmb(); /* read descriptor and rx_buffer_info after status DD */
2038 status = rx_desc->status;
2039 skb = buffer_info->skb;
2040 buffer_info->skb = NULL;
2041
2042 prefetch(skb->data - NET_IP_ALIGN);
2043
2044 if (++i == rx_ring->count)
2045 i = 0;
2046 next_rxd = IXGB_RX_DESC(*rx_ring, i);
2047 prefetch(next_rxd);
2048
2049 j = i + 1;
2050 if (j == rx_ring->count)
2051 j = 0;
2052 next2_buffer = &rx_ring->buffer_info[j];
2053 prefetch(next2_buffer);
2054
2055 next_buffer = &rx_ring->buffer_info[i];
2056
2057 cleaned = true;
2058 cleaned_count++;
2059
2060 dma_unmap_single(&pdev->dev,
2061 buffer_info->dma,
2062 buffer_info->length,
2063 DMA_FROM_DEVICE);
2064 buffer_info->dma = 0;
2065
2066 length = le16_to_cpu(rx_desc->length);
2067 rx_desc->length = 0;
2068
2069 if (unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
2070
2071 /* All receives must fit into a single buffer */
2072
2073 IXGB_DBG("Receive packet consumed multiple buffers "
2074 "length<%x>\n", length);
2075
2076 dev_kfree_skb_irq(skb);
2077 goto rxdesc_done;
2078 }
2079
2080 if (unlikely(rx_desc->errors &
2081 (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE |
2082 IXGB_RX_DESC_ERRORS_P | IXGB_RX_DESC_ERRORS_RXE))) {
2083 dev_kfree_skb_irq(skb);
2084 goto rxdesc_done;
2085 }
2086
2087 ixgb_check_copybreak(netdev, buffer_info, length, &skb);
2088
2089 /* Good Receive */
2090 skb_put(skb, length);
2091
2092 /* Receive Checksum Offload */
2093 ixgb_rx_checksum(adapter, rx_desc, skb);
2094
2095 skb->protocol = eth_type_trans(skb, netdev);
2096 if (status & IXGB_RX_DESC_STATUS_VP)
2097 __vlan_hwaccel_put_tag(skb,
2098 le16_to_cpu(rx_desc->special));
2099
2100 netif_receive_skb(skb);
2101
2102 rxdesc_done:
2103 /* clean up descriptor, might be written over by hw */
2104 rx_desc->status = 0;
2105
2106 /* return some buffers to hardware, one at a time is too slow */
2107 if (unlikely(cleaned_count >= IXGB_RX_BUFFER_WRITE)) {
2108 ixgb_alloc_rx_buffers(adapter, cleaned_count);
2109 cleaned_count = 0;
2110 }
2111
2112 /* use prefetched values */
2113 rx_desc = next_rxd;
2114 buffer_info = next_buffer;
2115 }
2116
2117 rx_ring->next_to_clean = i;
2118
2119 cleaned_count = IXGB_DESC_UNUSED(rx_ring);
2120 if (cleaned_count)
2121 ixgb_alloc_rx_buffers(adapter, cleaned_count);
2122
2123 return cleaned;
2124 }
2125
2126 /**
2127 * ixgb_alloc_rx_buffers - Replace used receive buffers
2128 * @adapter: address of board private structure
2129 **/
2130
2131 static void
2132 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter, int cleaned_count)
2133 {
2134 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2135 struct net_device *netdev = adapter->netdev;
2136 struct pci_dev *pdev = adapter->pdev;
2137 struct ixgb_rx_desc *rx_desc;
2138 struct ixgb_buffer *buffer_info;
2139 struct sk_buff *skb;
2140 unsigned int i;
2141 long cleancount;
2142
2143 i = rx_ring->next_to_use;
2144 buffer_info = &rx_ring->buffer_info[i];
2145 cleancount = IXGB_DESC_UNUSED(rx_ring);
2146
2147
2148 /* leave three descriptors unused */
2149 while (--cleancount > 2 && cleaned_count--) {
2150 /* recycle! its good for you */
2151 skb = buffer_info->skb;
2152 if (skb) {
2153 skb_trim(skb, 0);
2154 goto map_skb;
2155 }
2156
2157 skb = netdev_alloc_skb_ip_align(netdev, adapter->rx_buffer_len);
2158 if (unlikely(!skb)) {
2159 /* Better luck next round */
2160 adapter->alloc_rx_buff_failed++;
2161 break;
2162 }
2163
2164 buffer_info->skb = skb;
2165 buffer_info->length = adapter->rx_buffer_len;
2166 map_skb:
2167 buffer_info->dma = dma_map_single(&pdev->dev,
2168 skb->data,
2169 adapter->rx_buffer_len,
2170 DMA_FROM_DEVICE);
2171
2172 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2173 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
2174 /* guarantee DD bit not set now before h/w gets descriptor
2175 * this is the rest of the workaround for h/w double
2176 * writeback. */
2177 rx_desc->status = 0;
2178
2179
2180 if (++i == rx_ring->count) i = 0;
2181 buffer_info = &rx_ring->buffer_info[i];
2182 }
2183
2184 if (likely(rx_ring->next_to_use != i)) {
2185 rx_ring->next_to_use = i;
2186 if (unlikely(i-- == 0))
2187 i = (rx_ring->count - 1);
2188
2189 /* Force memory writes to complete before letting h/w
2190 * know there are new descriptors to fetch. (Only
2191 * applicable for weak-ordered memory model archs, such
2192 * as IA-64). */
2193 wmb();
2194 IXGB_WRITE_REG(&adapter->hw, RDT, i);
2195 }
2196 }
2197
2198 static void
2199 ixgb_vlan_strip_enable(struct ixgb_adapter *adapter)
2200 {
2201 u32 ctrl;
2202
2203 /* enable VLAN tag insert/strip */
2204 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2205 ctrl |= IXGB_CTRL0_VME;
2206 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2207 }
2208
2209 static void
2210 ixgb_vlan_strip_disable(struct ixgb_adapter *adapter)
2211 {
2212 u32 ctrl;
2213
2214 /* disable VLAN tag insert/strip */
2215 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2216 ctrl &= ~IXGB_CTRL0_VME;
2217 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2218 }
2219
2220 static int
2221 ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid)
2222 {
2223 struct ixgb_adapter *adapter = netdev_priv(netdev);
2224 u32 vfta, index;
2225
2226 /* add VID to filter table */
2227
2228 index = (vid >> 5) & 0x7F;
2229 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2230 vfta |= (1 << (vid & 0x1F));
2231 ixgb_write_vfta(&adapter->hw, index, vfta);
2232 set_bit(vid, adapter->active_vlans);
2233
2234 return 0;
2235 }
2236
2237 static int
2238 ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid)
2239 {
2240 struct ixgb_adapter *adapter = netdev_priv(netdev);
2241 u32 vfta, index;
2242
2243 /* remove VID from filter table */
2244
2245 index = (vid >> 5) & 0x7F;
2246 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2247 vfta &= ~(1 << (vid & 0x1F));
2248 ixgb_write_vfta(&adapter->hw, index, vfta);
2249 clear_bit(vid, adapter->active_vlans);
2250
2251 return 0;
2252 }
2253
2254 static void
2255 ixgb_restore_vlan(struct ixgb_adapter *adapter)
2256 {
2257 u16 vid;
2258
2259 for_each_set_bit(vid, adapter->active_vlans, VLAN_N_VID)
2260 ixgb_vlan_rx_add_vid(adapter->netdev, vid);
2261 }
2262
2263 #ifdef CONFIG_NET_POLL_CONTROLLER
2264 /*
2265 * Polling 'interrupt' - used by things like netconsole to send skbs
2266 * without having to re-enable interrupts. It's not called while
2267 * the interrupt routine is executing.
2268 */
2269
2270 static void ixgb_netpoll(struct net_device *dev)
2271 {
2272 struct ixgb_adapter *adapter = netdev_priv(dev);
2273
2274 disable_irq(adapter->pdev->irq);
2275 ixgb_intr(adapter->pdev->irq, dev);
2276 enable_irq(adapter->pdev->irq);
2277 }
2278 #endif
2279
2280 /**
2281 * ixgb_io_error_detected() - called when PCI error is detected
2282 * @pdev pointer to pci device with error
2283 * @state pci channel state after error
2284 *
2285 * This callback is called by the PCI subsystem whenever
2286 * a PCI bus error is detected.
2287 */
2288 static pci_ers_result_t ixgb_io_error_detected(struct pci_dev *pdev,
2289 enum pci_channel_state state)
2290 {
2291 struct net_device *netdev = pci_get_drvdata(pdev);
2292 struct ixgb_adapter *adapter = netdev_priv(netdev);
2293
2294 netif_device_detach(netdev);
2295
2296 if (state == pci_channel_io_perm_failure)
2297 return PCI_ERS_RESULT_DISCONNECT;
2298
2299 if (netif_running(netdev))
2300 ixgb_down(adapter, true);
2301
2302 pci_disable_device(pdev);
2303
2304 /* Request a slot reset. */
2305 return PCI_ERS_RESULT_NEED_RESET;
2306 }
2307
2308 /**
2309 * ixgb_io_slot_reset - called after the pci bus has been reset.
2310 * @pdev pointer to pci device with error
2311 *
2312 * This callback is called after the PCI bus has been reset.
2313 * Basically, this tries to restart the card from scratch.
2314 * This is a shortened version of the device probe/discovery code,
2315 * it resembles the first-half of the ixgb_probe() routine.
2316 */
2317 static pci_ers_result_t ixgb_io_slot_reset(struct pci_dev *pdev)
2318 {
2319 struct net_device *netdev = pci_get_drvdata(pdev);
2320 struct ixgb_adapter *adapter = netdev_priv(netdev);
2321
2322 if (pci_enable_device(pdev)) {
2323 netif_err(adapter, probe, adapter->netdev,
2324 "Cannot re-enable PCI device after reset\n");
2325 return PCI_ERS_RESULT_DISCONNECT;
2326 }
2327
2328 /* Perform card reset only on one instance of the card */
2329 if (0 != PCI_FUNC (pdev->devfn))
2330 return PCI_ERS_RESULT_RECOVERED;
2331
2332 pci_set_master(pdev);
2333
2334 netif_carrier_off(netdev);
2335 netif_stop_queue(netdev);
2336 ixgb_reset(adapter);
2337
2338 /* Make sure the EEPROM is good */
2339 if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
2340 netif_err(adapter, probe, adapter->netdev,
2341 "After reset, the EEPROM checksum is not valid\n");
2342 return PCI_ERS_RESULT_DISCONNECT;
2343 }
2344 ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
2345 memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
2346
2347 if (!is_valid_ether_addr(netdev->perm_addr)) {
2348 netif_err(adapter, probe, adapter->netdev,
2349 "After reset, invalid MAC address\n");
2350 return PCI_ERS_RESULT_DISCONNECT;
2351 }
2352
2353 return PCI_ERS_RESULT_RECOVERED;
2354 }
2355
2356 /**
2357 * ixgb_io_resume - called when its OK to resume normal operations
2358 * @pdev pointer to pci device with error
2359 *
2360 * The error recovery driver tells us that its OK to resume
2361 * normal operation. Implementation resembles the second-half
2362 * of the ixgb_probe() routine.
2363 */
2364 static void ixgb_io_resume(struct pci_dev *pdev)
2365 {
2366 struct net_device *netdev = pci_get_drvdata(pdev);
2367 struct ixgb_adapter *adapter = netdev_priv(netdev);
2368
2369 pci_set_master(pdev);
2370
2371 if (netif_running(netdev)) {
2372 if (ixgb_up(adapter)) {
2373 pr_err("can't bring device back up after reset\n");
2374 return;
2375 }
2376 }
2377
2378 netif_device_attach(netdev);
2379 mod_timer(&adapter->watchdog_timer, jiffies);
2380 }
2381
2382 /* ixgb_main.c */