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