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Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux...
[linux/fpc-iii.git] / drivers / net / ethernet / intel / ixgb / ixgb_main.c
blob31f91459312f1757fcd795eb3cd512cd12911b59
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 const struct pci_device_id 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,
105 __be16 proto, u16 vid);
106 static int ixgb_vlan_rx_kill_vid(struct net_device *netdev,
107 __be16 proto, u16 vid);
108 static void ixgb_restore_vlan(struct ixgb_adapter *adapter);
109
110 #ifdef CONFIG_NET_POLL_CONTROLLER
111 /* for netdump / net console */
112 static void ixgb_netpoll(struct net_device *dev);
113 #endif
114
115 static pci_ers_result_t ixgb_io_error_detected (struct pci_dev *pdev,
116 enum pci_channel_state state);
117 static pci_ers_result_t ixgb_io_slot_reset (struct pci_dev *pdev);
118 static void ixgb_io_resume (struct pci_dev *pdev);
119
120 static const struct pci_error_handlers ixgb_err_handler = {
121 .error_detected = ixgb_io_error_detected,
122 .slot_reset = ixgb_io_slot_reset,
123 .resume = ixgb_io_resume,
124 };
125
126 static struct pci_driver ixgb_driver = {
127 .name = ixgb_driver_name,
128 .id_table = ixgb_pci_tbl,
129 .probe = ixgb_probe,
130 .remove = ixgb_remove,
131 .err_handler = &ixgb_err_handler
132 };
133
134 MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
135 MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver");
136 MODULE_LICENSE("GPL");
137 MODULE_VERSION(DRV_VERSION);
138
139 #define DEFAULT_MSG_ENABLE (NETIF_MSG_DRV|NETIF_MSG_PROBE|NETIF_MSG_LINK)
140 static int debug = -1;
141 module_param(debug, int, 0);
142 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
143
144 /**
145 * ixgb_init_module - Driver Registration Routine
146 *
147 * ixgb_init_module is the first routine called when the driver is
148 * loaded. All it does is register with the PCI subsystem.
149 **/
150
151 static int __init
152 ixgb_init_module(void)
153 {
154 pr_info("%s - version %s\n", ixgb_driver_string, ixgb_driver_version);
155 pr_info("%s\n", ixgb_copyright);
156
157 return pci_register_driver(&ixgb_driver);
158 }
159
160 module_init(ixgb_init_module);
161
162 /**
163 * ixgb_exit_module - Driver Exit Cleanup Routine
164 *
165 * ixgb_exit_module is called just before the driver is removed
166 * from memory.
167 **/
168
169 static void __exit
170 ixgb_exit_module(void)
171 {
172 pci_unregister_driver(&ixgb_driver);
173 }
174
175 module_exit(ixgb_exit_module);
176
177 /**
178 * ixgb_irq_disable - Mask off interrupt generation on the NIC
179 * @adapter: board private structure
180 **/
181
182 static void
183 ixgb_irq_disable(struct ixgb_adapter *adapter)
184 {
185 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
186 IXGB_WRITE_FLUSH(&adapter->hw);
187 synchronize_irq(adapter->pdev->irq);
188 }
189
190 /**
191 * ixgb_irq_enable - Enable default interrupt generation settings
192 * @adapter: board private structure
193 **/
194
195 static void
196 ixgb_irq_enable(struct ixgb_adapter *adapter)
197 {
198 u32 val = IXGB_INT_RXT0 | IXGB_INT_RXDMT0 |
199 IXGB_INT_TXDW | IXGB_INT_LSC;
200 if (adapter->hw.subsystem_vendor_id == PCI_VENDOR_ID_SUN)
201 val |= IXGB_INT_GPI0;
202 IXGB_WRITE_REG(&adapter->hw, IMS, val);
203 IXGB_WRITE_FLUSH(&adapter->hw);
204 }
205
206 int
207 ixgb_up(struct ixgb_adapter *adapter)
208 {
209 struct net_device *netdev = adapter->netdev;
210 int err, irq_flags = IRQF_SHARED;
211 int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
212 struct ixgb_hw *hw = &adapter->hw;
213
214 /* hardware has been reset, we need to reload some things */
215
216 ixgb_rar_set(hw, netdev->dev_addr, 0);
217 ixgb_set_multi(netdev);
218
219 ixgb_restore_vlan(adapter);
220
221 ixgb_configure_tx(adapter);
222 ixgb_setup_rctl(adapter);
223 ixgb_configure_rx(adapter);
224 ixgb_alloc_rx_buffers(adapter, IXGB_DESC_UNUSED(&adapter->rx_ring));
225
226 /* disable interrupts and get the hardware into a known state */
227 IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);
228
229 /* only enable MSI if bus is in PCI-X mode */
230 if (IXGB_READ_REG(&adapter->hw, STATUS) & IXGB_STATUS_PCIX_MODE) {
231 err = pci_enable_msi(adapter->pdev);
232 if (!err) {
233 adapter->have_msi = true;
234 irq_flags = 0;
235 }
236 /* proceed to try to request regular interrupt */
237 }
238
239 err = request_irq(adapter->pdev->irq, ixgb_intr, irq_flags,
240 netdev->name, netdev);
241 if (err) {
242 if (adapter->have_msi)
243 pci_disable_msi(adapter->pdev);
244 netif_err(adapter, probe, adapter->netdev,
245 "Unable to allocate interrupt Error: %d\n", err);
246 return err;
247 }
248
249 if ((hw->max_frame_size != max_frame) ||
250 (hw->max_frame_size !=
251 (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {
252
253 hw->max_frame_size = max_frame;
254
255 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
256
257 if (hw->max_frame_size >
258 IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
259 u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
260
261 if (!(ctrl0 & IXGB_CTRL0_JFE)) {
262 ctrl0 |= IXGB_CTRL0_JFE;
263 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
264 }
265 }
266 }
267
268 clear_bit(__IXGB_DOWN, &adapter->flags);
269
270 napi_enable(&adapter->napi);
271 ixgb_irq_enable(adapter);
272
273 netif_wake_queue(netdev);
274
275 mod_timer(&adapter->watchdog_timer, jiffies);
276
277 return 0;
278 }
279
280 void
281 ixgb_down(struct ixgb_adapter *adapter, bool kill_watchdog)
282 {
283 struct net_device *netdev = adapter->netdev;
284
285 /* prevent the interrupt handler from restarting watchdog */
286 set_bit(__IXGB_DOWN, &adapter->flags);
287
288 netif_carrier_off(netdev);
289
290 napi_disable(&adapter->napi);
291 /* waiting for NAPI to complete can re-enable interrupts */
292 ixgb_irq_disable(adapter);
293 free_irq(adapter->pdev->irq, netdev);
294
295 if (adapter->have_msi)
296 pci_disable_msi(adapter->pdev);
297
298 if (kill_watchdog)
299 del_timer_sync(&adapter->watchdog_timer);
300
301 adapter->link_speed = 0;
302 adapter->link_duplex = 0;
303 netif_stop_queue(netdev);
304
305 ixgb_reset(adapter);
306 ixgb_clean_tx_ring(adapter);
307 ixgb_clean_rx_ring(adapter);
308 }
309
310 void
311 ixgb_reset(struct ixgb_adapter *adapter)
312 {
313 struct ixgb_hw *hw = &adapter->hw;
314
315 ixgb_adapter_stop(hw);
316 if (!ixgb_init_hw(hw))
317 netif_err(adapter, probe, adapter->netdev, "ixgb_init_hw failed\n");
318
319 /* restore frame size information */
320 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
321 if (hw->max_frame_size >
322 IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
323 u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
324 if (!(ctrl0 & IXGB_CTRL0_JFE)) {
325 ctrl0 |= IXGB_CTRL0_JFE;
326 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
327 }
328 }
329 }
330
331 static netdev_features_t
332 ixgb_fix_features(struct net_device *netdev, netdev_features_t features)
333 {
334 /*
335 * Tx VLAN insertion does not work per HW design when Rx stripping is
336 * disabled.
337 */
338 if (!(features & NETIF_F_HW_VLAN_CTAG_RX))
339 features &= ~NETIF_F_HW_VLAN_CTAG_TX;
340
341 return features;
342 }
343
344 static int
345 ixgb_set_features(struct net_device *netdev, netdev_features_t features)
346 {
347 struct ixgb_adapter *adapter = netdev_priv(netdev);
348 netdev_features_t changed = features ^ netdev->features;
349
350 if (!(changed & (NETIF_F_RXCSUM|NETIF_F_HW_VLAN_CTAG_RX)))
351 return 0;
352
353 adapter->rx_csum = !!(features & NETIF_F_RXCSUM);
354
355 if (netif_running(netdev)) {
356 ixgb_down(adapter, true);
357 ixgb_up(adapter);
358 ixgb_set_speed_duplex(netdev);
359 } else
360 ixgb_reset(adapter);
361
362 return 0;
363 }
364
365
366 static const struct net_device_ops ixgb_netdev_ops = {
367 .ndo_open = ixgb_open,
368 .ndo_stop = ixgb_close,
369 .ndo_start_xmit = ixgb_xmit_frame,
370 .ndo_get_stats = ixgb_get_stats,
371 .ndo_set_rx_mode = ixgb_set_multi,
372 .ndo_validate_addr = eth_validate_addr,
373 .ndo_set_mac_address = ixgb_set_mac,
374 .ndo_change_mtu = ixgb_change_mtu,
375 .ndo_tx_timeout = ixgb_tx_timeout,
376 .ndo_vlan_rx_add_vid = ixgb_vlan_rx_add_vid,
377 .ndo_vlan_rx_kill_vid = ixgb_vlan_rx_kill_vid,
378 #ifdef CONFIG_NET_POLL_CONTROLLER
379 .ndo_poll_controller = ixgb_netpoll,
380 #endif
381 .ndo_fix_features = ixgb_fix_features,
382 .ndo_set_features = ixgb_set_features,
383 };
384
385 /**
386 * ixgb_probe - Device Initialization Routine
387 * @pdev: PCI device information struct
388 * @ent: entry in ixgb_pci_tbl
389 *
390 * Returns 0 on success, negative on failure
391 *
392 * ixgb_probe initializes an adapter identified by a pci_dev structure.
393 * The OS initialization, configuring of the adapter private structure,
394 * and a hardware reset occur.
395 **/
396
397 static int
398 ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
399 {
400 struct net_device *netdev = NULL;
401 struct ixgb_adapter *adapter;
402 static int cards_found = 0;
403 int pci_using_dac;
404 int i;
405 int err;
406
407 err = pci_enable_device(pdev);
408 if (err)
409 return err;
410
411 pci_using_dac = 0;
412 err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
413 if (!err) {
414 pci_using_dac = 1;
415 } else {
416 err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
417 if (err) {
418 pr_err("No usable DMA configuration, aborting\n");
419 goto err_dma_mask;
420 }
421 }
422
423 err = pci_request_regions(pdev, ixgb_driver_name);
424 if (err)
425 goto err_request_regions;
426
427 pci_set_master(pdev);
428
429 netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
430 if (!netdev) {
431 err = -ENOMEM;
432 goto err_alloc_etherdev;
433 }
434
435 SET_NETDEV_DEV(netdev, &pdev->dev);
436
437 pci_set_drvdata(pdev, netdev);
438 adapter = netdev_priv(netdev);
439 adapter->netdev = netdev;
440 adapter->pdev = pdev;
441 adapter->hw.back = adapter;
442 adapter->msg_enable = netif_msg_init(debug, DEFAULT_MSG_ENABLE);
443
444 adapter->hw.hw_addr = pci_ioremap_bar(pdev, BAR_0);
445 if (!adapter->hw.hw_addr) {
446 err = -EIO;
447 goto err_ioremap;
448 }
449
450 for (i = BAR_1; i <= BAR_5; i++) {
451 if (pci_resource_len(pdev, i) == 0)
452 continue;
453 if (pci_resource_flags(pdev, i) & IORESOURCE_IO) {
454 adapter->hw.io_base = pci_resource_start(pdev, i);
455 break;
456 }
457 }
458
459 netdev->netdev_ops = &ixgb_netdev_ops;
460 ixgb_set_ethtool_ops(netdev);
461 netdev->watchdog_timeo = 5 * HZ;
462 netif_napi_add(netdev, &adapter->napi, ixgb_clean, 64);
463
464 strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
465
466 adapter->bd_number = cards_found;
467 adapter->link_speed = 0;
468 adapter->link_duplex = 0;
469
470 /* setup the private structure */
471
472 err = ixgb_sw_init(adapter);
473 if (err)
474 goto err_sw_init;
475
476 netdev->hw_features = NETIF_F_SG |
477 NETIF_F_TSO |
478 NETIF_F_HW_CSUM |
479 NETIF_F_HW_VLAN_CTAG_TX |
480 NETIF_F_HW_VLAN_CTAG_RX;
481 netdev->features = netdev->hw_features |
482 NETIF_F_HW_VLAN_CTAG_FILTER;
483 netdev->hw_features |= NETIF_F_RXCSUM;
484
485 if (pci_using_dac) {
486 netdev->features |= NETIF_F_HIGHDMA;
487 netdev->vlan_features |= NETIF_F_HIGHDMA;
488 }
489
490 /* make sure the EEPROM is good */
491
492 if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
493 netif_err(adapter, probe, adapter->netdev,
494 "The EEPROM Checksum Is Not Valid\n");
495 err = -EIO;
496 goto err_eeprom;
497 }
498
499 ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
500
501 if (!is_valid_ether_addr(netdev->dev_addr)) {
502 netif_err(adapter, probe, adapter->netdev, "Invalid MAC Address\n");
503 err = -EIO;
504 goto err_eeprom;
505 }
506
507 adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
508
509 init_timer(&adapter->watchdog_timer);
510 adapter->watchdog_timer.function = ixgb_watchdog;
511 adapter->watchdog_timer.data = (unsigned long)adapter;
512
513 INIT_WORK(&adapter->tx_timeout_task, ixgb_tx_timeout_task);
514
515 strcpy(netdev->name, "eth%d");
516 err = register_netdev(netdev);
517 if (err)
518 goto err_register;
519
520 /* carrier off reporting is important to ethtool even BEFORE open */
521 netif_carrier_off(netdev);
522
523 netif_info(adapter, probe, adapter->netdev,
524 "Intel(R) PRO/10GbE Network Connection\n");
525 ixgb_check_options(adapter);
526 /* reset the hardware with the new settings */
527
528 ixgb_reset(adapter);
529
530 cards_found++;
531 return 0;
532
533 err_register:
534 err_sw_init:
535 err_eeprom:
536 iounmap(adapter->hw.hw_addr);
537 err_ioremap:
538 free_netdev(netdev);
539 err_alloc_etherdev:
540 pci_release_regions(pdev);
541 err_request_regions:
542 err_dma_mask:
543 pci_disable_device(pdev);
544 return err;
545 }
546
547 /**
548 * ixgb_remove - Device Removal Routine
549 * @pdev: PCI device information struct
550 *
551 * ixgb_remove is called by the PCI subsystem to alert the driver
552 * that it should release a PCI device. The could be caused by a
553 * Hot-Plug event, or because the driver is going to be removed from
554 * memory.
555 **/
556
557 static void
558 ixgb_remove(struct pci_dev *pdev)
559 {
560 struct net_device *netdev = pci_get_drvdata(pdev);
561 struct ixgb_adapter *adapter = netdev_priv(netdev);
562
563 cancel_work_sync(&adapter->tx_timeout_task);
564
565 unregister_netdev(netdev);
566
567 iounmap(adapter->hw.hw_addr);
568 pci_release_regions(pdev);
569
570 free_netdev(netdev);
571 pci_disable_device(pdev);
572 }
573
574 /**
575 * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
576 * @adapter: board private structure to initialize
577 *
578 * ixgb_sw_init initializes the Adapter private data structure.
579 * Fields are initialized based on PCI device information and
580 * OS network device settings (MTU size).
581 **/
582
583 static int
584 ixgb_sw_init(struct ixgb_adapter *adapter)
585 {
586 struct ixgb_hw *hw = &adapter->hw;
587 struct net_device *netdev = adapter->netdev;
588 struct pci_dev *pdev = adapter->pdev;
589
590 /* PCI config space info */
591
592 hw->vendor_id = pdev->vendor;
593 hw->device_id = pdev->device;
594 hw->subsystem_vendor_id = pdev->subsystem_vendor;
595 hw->subsystem_id = pdev->subsystem_device;
596
597 hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
598 adapter->rx_buffer_len = hw->max_frame_size + 8; /* + 8 for errata */
599
600 if ((hw->device_id == IXGB_DEVICE_ID_82597EX) ||
601 (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4) ||
602 (hw->device_id == IXGB_DEVICE_ID_82597EX_LR) ||
603 (hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
604 hw->mac_type = ixgb_82597;
605 else {
606 /* should never have loaded on this device */
607 netif_err(adapter, probe, adapter->netdev, "unsupported device id\n");
608 }
609
610 /* enable flow control to be programmed */
611 hw->fc.send_xon = 1;
612
613 set_bit(__IXGB_DOWN, &adapter->flags);
614 return 0;
615 }
616
617 /**
618 * ixgb_open - Called when a network interface is made active
619 * @netdev: network interface device structure
620 *
621 * Returns 0 on success, negative value on failure
622 *
623 * The open entry point is called when a network interface is made
624 * active by the system (IFF_UP). At this point all resources needed
625 * for transmit and receive operations are allocated, the interrupt
626 * handler is registered with the OS, the watchdog timer is started,
627 * and the stack is notified that the interface is ready.
628 **/
629
630 static int
631 ixgb_open(struct net_device *netdev)
632 {
633 struct ixgb_adapter *adapter = netdev_priv(netdev);
634 int err;
635
636 /* allocate transmit descriptors */
637 err = ixgb_setup_tx_resources(adapter);
638 if (err)
639 goto err_setup_tx;
640
641 netif_carrier_off(netdev);
642
643 /* allocate receive descriptors */
644
645 err = ixgb_setup_rx_resources(adapter);
646 if (err)
647 goto err_setup_rx;
648
649 err = ixgb_up(adapter);
650 if (err)
651 goto err_up;
652
653 netif_start_queue(netdev);
654
655 return 0;
656
657 err_up:
658 ixgb_free_rx_resources(adapter);
659 err_setup_rx:
660 ixgb_free_tx_resources(adapter);
661 err_setup_tx:
662 ixgb_reset(adapter);
663
664 return err;
665 }
666
667 /**
668 * ixgb_close - Disables a network interface
669 * @netdev: network interface device structure
670 *
671 * Returns 0, this is not allowed to fail
672 *
673 * The close entry point is called when an interface is de-activated
674 * by the OS. The hardware is still under the drivers control, but
675 * needs to be disabled. A global MAC reset is issued to stop the
676 * hardware, and all transmit and receive resources are freed.
677 **/
678
679 static int
680 ixgb_close(struct net_device *netdev)
681 {
682 struct ixgb_adapter *adapter = netdev_priv(netdev);
683
684 ixgb_down(adapter, true);
685
686 ixgb_free_tx_resources(adapter);
687 ixgb_free_rx_resources(adapter);
688
689 return 0;
690 }
691
692 /**
693 * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
694 * @adapter: board private structure
695 *
696 * Return 0 on success, negative on failure
697 **/
698
699 int
700 ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
701 {
702 struct ixgb_desc_ring *txdr = &adapter->tx_ring;
703 struct pci_dev *pdev = adapter->pdev;
704 int size;
705
706 size = sizeof(struct ixgb_buffer) * txdr->count;
707 txdr->buffer_info = vzalloc(size);
708 if (!txdr->buffer_info)
709 return -ENOMEM;
710
711 /* round up to nearest 4K */
712
713 txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
714 txdr->size = ALIGN(txdr->size, 4096);
715
716 txdr->desc = dma_zalloc_coherent(&pdev->dev, txdr->size, &txdr->dma,
717 GFP_KERNEL);
718 if (!txdr->desc) {
719 vfree(txdr->buffer_info);
720 return -ENOMEM;
721 }
722
723 txdr->next_to_use = 0;
724 txdr->next_to_clean = 0;
725
726 return 0;
727 }
728
729 /**
730 * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
731 * @adapter: board private structure
732 *
733 * Configure the Tx unit of the MAC after a reset.
734 **/
735
736 static void
737 ixgb_configure_tx(struct ixgb_adapter *adapter)
738 {
739 u64 tdba = adapter->tx_ring.dma;
740 u32 tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
741 u32 tctl;
742 struct ixgb_hw *hw = &adapter->hw;
743
744 /* Setup the Base and Length of the Tx Descriptor Ring
745 * tx_ring.dma can be either a 32 or 64 bit value
746 */
747
748 IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
749 IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
750
751 IXGB_WRITE_REG(hw, TDLEN, tdlen);
752
753 /* Setup the HW Tx Head and Tail descriptor pointers */
754
755 IXGB_WRITE_REG(hw, TDH, 0);
756 IXGB_WRITE_REG(hw, TDT, 0);
757
758 /* don't set up txdctl, it induces performance problems if configured
759 * incorrectly */
760 /* Set the Tx Interrupt Delay register */
761
762 IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
763
764 /* Program the Transmit Control Register */
765
766 tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
767 IXGB_WRITE_REG(hw, TCTL, tctl);
768
769 /* Setup Transmit Descriptor Settings for this adapter */
770 adapter->tx_cmd_type =
771 IXGB_TX_DESC_TYPE |
772 (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
773 }
774
775 /**
776 * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
777 * @adapter: board private structure
778 *
779 * Returns 0 on success, negative on failure
780 **/
781
782 int
783 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
784 {
785 struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
786 struct pci_dev *pdev = adapter->pdev;
787 int size;
788
789 size = sizeof(struct ixgb_buffer) * rxdr->count;
790 rxdr->buffer_info = vzalloc(size);
791 if (!rxdr->buffer_info)
792 return -ENOMEM;
793
794 /* Round up to nearest 4K */
795
796 rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
797 rxdr->size = ALIGN(rxdr->size, 4096);
798
799 rxdr->desc = dma_alloc_coherent(&pdev->dev, rxdr->size, &rxdr->dma,
800 GFP_KERNEL);
801
802 if (!rxdr->desc) {
803 vfree(rxdr->buffer_info);
804 return -ENOMEM;
805 }
806 memset(rxdr->desc, 0, rxdr->size);
807
808 rxdr->next_to_clean = 0;
809 rxdr->next_to_use = 0;
810
811 return 0;
812 }
813
814 /**
815 * ixgb_setup_rctl - configure the receive control register
816 * @adapter: Board private structure
817 **/
818
819 static void
820 ixgb_setup_rctl(struct ixgb_adapter *adapter)
821 {
822 u32 rctl;
823
824 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
825
826 rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
827
828 rctl |=
829 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
830 IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
831 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
832
833 rctl |= IXGB_RCTL_SECRC;
834
835 if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048)
836 rctl |= IXGB_RCTL_BSIZE_2048;
837 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096)
838 rctl |= IXGB_RCTL_BSIZE_4096;
839 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192)
840 rctl |= IXGB_RCTL_BSIZE_8192;
841 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384)
842 rctl |= IXGB_RCTL_BSIZE_16384;
843
844 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
845 }
846
847 /**
848 * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
849 * @adapter: board private structure
850 *
851 * Configure the Rx unit of the MAC after a reset.
852 **/
853
854 static void
855 ixgb_configure_rx(struct ixgb_adapter *adapter)
856 {
857 u64 rdba = adapter->rx_ring.dma;
858 u32 rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
859 struct ixgb_hw *hw = &adapter->hw;
860 u32 rctl;
861 u32 rxcsum;
862
863 /* make sure receives are disabled while setting up the descriptors */
864
865 rctl = IXGB_READ_REG(hw, RCTL);
866 IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
867
868 /* set the Receive Delay Timer Register */
869
870 IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
871
872 /* Setup the Base and Length of the Rx Descriptor Ring */
873
874 IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
875 IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
876
877 IXGB_WRITE_REG(hw, RDLEN, rdlen);
878
879 /* Setup the HW Rx Head and Tail Descriptor Pointers */
880 IXGB_WRITE_REG(hw, RDH, 0);
881 IXGB_WRITE_REG(hw, RDT, 0);
882
883 /* due to the hardware errata with RXDCTL, we are unable to use any of
884 * the performance enhancing features of it without causing other
885 * subtle bugs, some of the bugs could include receive length
886 * corruption at high data rates (WTHRESH > 0) and/or receive
887 * descriptor ring irregularites (particularly in hardware cache) */
888 IXGB_WRITE_REG(hw, RXDCTL, 0);
889
890 /* Enable Receive Checksum Offload for TCP and UDP */
891 if (adapter->rx_csum) {
892 rxcsum = IXGB_READ_REG(hw, RXCSUM);
893 rxcsum |= IXGB_RXCSUM_TUOFL;
894 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
895 }
896
897 /* Enable Receives */
898
899 IXGB_WRITE_REG(hw, RCTL, rctl);
900 }
901
902 /**
903 * ixgb_free_tx_resources - Free Tx Resources
904 * @adapter: board private structure
905 *
906 * Free all transmit software resources
907 **/
908
909 void
910 ixgb_free_tx_resources(struct ixgb_adapter *adapter)
911 {
912 struct pci_dev *pdev = adapter->pdev;
913
914 ixgb_clean_tx_ring(adapter);
915
916 vfree(adapter->tx_ring.buffer_info);
917 adapter->tx_ring.buffer_info = NULL;
918
919 dma_free_coherent(&pdev->dev, adapter->tx_ring.size,
920 adapter->tx_ring.desc, adapter->tx_ring.dma);
921
922 adapter->tx_ring.desc = NULL;
923 }
924
925 static void
926 ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
927 struct ixgb_buffer *buffer_info)
928 {
929 if (buffer_info->dma) {
930 if (buffer_info->mapped_as_page)
931 dma_unmap_page(&adapter->pdev->dev, buffer_info->dma,
932 buffer_info->length, DMA_TO_DEVICE);
933 else
934 dma_unmap_single(&adapter->pdev->dev, buffer_info->dma,
935 buffer_info->length, DMA_TO_DEVICE);
936 buffer_info->dma = 0;
937 }
938
939 if (buffer_info->skb) {
940 dev_kfree_skb_any(buffer_info->skb);
941 buffer_info->skb = NULL;
942 }
943 buffer_info->time_stamp = 0;
944 /* these fields must always be initialized in tx
945 * buffer_info->length = 0;
946 * buffer_info->next_to_watch = 0; */
947 }
948
949 /**
950 * ixgb_clean_tx_ring - Free Tx Buffers
951 * @adapter: board private structure
952 **/
953
954 static void
955 ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
956 {
957 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
958 struct ixgb_buffer *buffer_info;
959 unsigned long size;
960 unsigned int i;
961
962 /* Free all the Tx ring sk_buffs */
963
964 for (i = 0; i < tx_ring->count; i++) {
965 buffer_info = &tx_ring->buffer_info[i];
966 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
967 }
968
969 size = sizeof(struct ixgb_buffer) * tx_ring->count;
970 memset(tx_ring->buffer_info, 0, size);
971
972 /* Zero out the descriptor ring */
973
974 memset(tx_ring->desc, 0, tx_ring->size);
975
976 tx_ring->next_to_use = 0;
977 tx_ring->next_to_clean = 0;
978
979 IXGB_WRITE_REG(&adapter->hw, TDH, 0);
980 IXGB_WRITE_REG(&adapter->hw, TDT, 0);
981 }
982
983 /**
984 * ixgb_free_rx_resources - Free Rx Resources
985 * @adapter: board private structure
986 *
987 * Free all receive software resources
988 **/
989
990 void
991 ixgb_free_rx_resources(struct ixgb_adapter *adapter)
992 {
993 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
994 struct pci_dev *pdev = adapter->pdev;
995
996 ixgb_clean_rx_ring(adapter);
997
998 vfree(rx_ring->buffer_info);
999 rx_ring->buffer_info = NULL;
1000
1001 dma_free_coherent(&pdev->dev, rx_ring->size, rx_ring->desc,
1002 rx_ring->dma);
1003
1004 rx_ring->desc = NULL;
1005 }
1006
1007 /**
1008 * ixgb_clean_rx_ring - Free Rx Buffers
1009 * @adapter: board private structure
1010 **/
1011
1012 static void
1013 ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
1014 {
1015 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1016 struct ixgb_buffer *buffer_info;
1017 struct pci_dev *pdev = adapter->pdev;
1018 unsigned long size;
1019 unsigned int i;
1020
1021 /* Free all the Rx ring sk_buffs */
1022
1023 for (i = 0; i < rx_ring->count; i++) {
1024 buffer_info = &rx_ring->buffer_info[i];
1025 if (buffer_info->dma) {
1026 dma_unmap_single(&pdev->dev,
1027 buffer_info->dma,
1028 buffer_info->length,
1029 DMA_FROM_DEVICE);
1030 buffer_info->dma = 0;
1031 buffer_info->length = 0;
1032 }
1033
1034 if (buffer_info->skb) {
1035 dev_kfree_skb(buffer_info->skb);
1036 buffer_info->skb = NULL;
1037 }
1038 }
1039
1040 size = sizeof(struct ixgb_buffer) * rx_ring->count;
1041 memset(rx_ring->buffer_info, 0, size);
1042
1043 /* Zero out the descriptor ring */
1044
1045 memset(rx_ring->desc, 0, rx_ring->size);
1046
1047 rx_ring->next_to_clean = 0;
1048 rx_ring->next_to_use = 0;
1049
1050 IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1051 IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1052 }
1053
1054 /**
1055 * ixgb_set_mac - Change the Ethernet Address of the NIC
1056 * @netdev: network interface device structure
1057 * @p: pointer to an address structure
1058 *
1059 * Returns 0 on success, negative on failure
1060 **/
1061
1062 static int
1063 ixgb_set_mac(struct net_device *netdev, void *p)
1064 {
1065 struct ixgb_adapter *adapter = netdev_priv(netdev);
1066 struct sockaddr *addr = p;
1067
1068 if (!is_valid_ether_addr(addr->sa_data))
1069 return -EADDRNOTAVAIL;
1070
1071 memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1072
1073 ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1074
1075 return 0;
1076 }
1077
1078 /**
1079 * ixgb_set_multi - Multicast and Promiscuous mode set
1080 * @netdev: network interface device structure
1081 *
1082 * The set_multi entry point is called whenever the multicast address
1083 * list or the network interface flags are updated. This routine is
1084 * responsible for configuring the hardware for proper multicast,
1085 * promiscuous mode, and all-multi behavior.
1086 **/
1087
1088 static void
1089 ixgb_set_multi(struct net_device *netdev)
1090 {
1091 struct ixgb_adapter *adapter = netdev_priv(netdev);
1092 struct ixgb_hw *hw = &adapter->hw;
1093 struct netdev_hw_addr *ha;
1094 u32 rctl;
1095
1096 /* Check for Promiscuous and All Multicast modes */
1097
1098 rctl = IXGB_READ_REG(hw, RCTL);
1099
1100 if (netdev->flags & IFF_PROMISC) {
1101 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1102 /* disable VLAN filtering */
1103 rctl &= ~IXGB_RCTL_CFIEN;
1104 rctl &= ~IXGB_RCTL_VFE;
1105 } else {
1106 if (netdev->flags & IFF_ALLMULTI) {
1107 rctl |= IXGB_RCTL_MPE;
1108 rctl &= ~IXGB_RCTL_UPE;
1109 } else {
1110 rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1111 }
1112 /* enable VLAN filtering */
1113 rctl |= IXGB_RCTL_VFE;
1114 rctl &= ~IXGB_RCTL_CFIEN;
1115 }
1116
1117 if (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1118 rctl |= IXGB_RCTL_MPE;
1119 IXGB_WRITE_REG(hw, RCTL, rctl);
1120 } else {
1121 u8 *mta = kmalloc(IXGB_MAX_NUM_MULTICAST_ADDRESSES *
1122 ETH_ALEN, GFP_ATOMIC);
1123 u8 *addr;
1124 if (!mta)
1125 goto alloc_failed;
1126
1127 IXGB_WRITE_REG(hw, RCTL, rctl);
1128
1129 addr = mta;
1130 netdev_for_each_mc_addr(ha, netdev) {
1131 memcpy(addr, ha->addr, ETH_ALEN);
1132 addr += ETH_ALEN;
1133 }
1134
1135 ixgb_mc_addr_list_update(hw, mta, netdev_mc_count(netdev), 0);
1136 kfree(mta);
1137 }
1138
1139 alloc_failed:
1140 if (netdev->features & NETIF_F_HW_VLAN_CTAG_RX)
1141 ixgb_vlan_strip_enable(adapter);
1142 else
1143 ixgb_vlan_strip_disable(adapter);
1144
1145 }
1146
1147 /**
1148 * ixgb_watchdog - Timer Call-back
1149 * @data: pointer to netdev cast into an unsigned long
1150 **/
1151
1152 static void
1153 ixgb_watchdog(unsigned long data)
1154 {
1155 struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
1156 struct net_device *netdev = adapter->netdev;
1157 struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1158
1159 ixgb_check_for_link(&adapter->hw);
1160
1161 if (ixgb_check_for_bad_link(&adapter->hw)) {
1162 /* force the reset path */
1163 netif_stop_queue(netdev);
1164 }
1165
1166 if (adapter->hw.link_up) {
1167 if (!netif_carrier_ok(netdev)) {
1168 netdev_info(netdev,
1169 "NIC Link is Up 10 Gbps Full Duplex, Flow Control: %s\n",
1170 (adapter->hw.fc.type == ixgb_fc_full) ?
1171 "RX/TX" :
1172 (adapter->hw.fc.type == ixgb_fc_rx_pause) ?
1173 "RX" :
1174 (adapter->hw.fc.type == ixgb_fc_tx_pause) ?
1175 "TX" : "None");
1176 adapter->link_speed = 10000;
1177 adapter->link_duplex = FULL_DUPLEX;
1178 netif_carrier_on(netdev);
1179 }
1180 } else {
1181 if (netif_carrier_ok(netdev)) {
1182 adapter->link_speed = 0;
1183 adapter->link_duplex = 0;
1184 netdev_info(netdev, "NIC Link is Down\n");
1185 netif_carrier_off(netdev);
1186 }
1187 }
1188
1189 ixgb_update_stats(adapter);
1190
1191 if (!netif_carrier_ok(netdev)) {
1192 if (IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1193 /* We've lost link, so the controller stops DMA,
1194 * but we've got queued Tx work that's never going
1195 * to get done, so reset controller to flush Tx.
1196 * (Do the reset outside of interrupt context). */
1197 schedule_work(&adapter->tx_timeout_task);
1198 /* return immediately since reset is imminent */
1199 return;
1200 }
1201 }
1202
1203 /* Force detection of hung controller every watchdog period */
1204 adapter->detect_tx_hung = true;
1205
1206 /* generate an interrupt to force clean up of any stragglers */
1207 IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1208
1209 /* Reset the timer */
1210 mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1211 }
1212
1213 #define IXGB_TX_FLAGS_CSUM 0x00000001
1214 #define IXGB_TX_FLAGS_VLAN 0x00000002
1215 #define IXGB_TX_FLAGS_TSO 0x00000004
1216
1217 static int
1218 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1219 {
1220 struct ixgb_context_desc *context_desc;
1221 unsigned int i;
1222 u8 ipcss, ipcso, tucss, tucso, hdr_len;
1223 u16 ipcse, tucse, mss;
1224
1225 if (likely(skb_is_gso(skb))) {
1226 struct ixgb_buffer *buffer_info;
1227 struct iphdr *iph;
1228 int err;
1229
1230 err = skb_cow_head(skb, 0);
1231 if (err < 0)
1232 return err;
1233
1234 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
1235 mss = skb_shinfo(skb)->gso_size;
1236 iph = ip_hdr(skb);
1237 iph->tot_len = 0;
1238 iph->check = 0;
1239 tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
1240 iph->daddr, 0,
1241 IPPROTO_TCP, 0);
1242 ipcss = skb_network_offset(skb);
1243 ipcso = (void *)&(iph->check) - (void *)skb->data;
1244 ipcse = skb_transport_offset(skb) - 1;
1245 tucss = skb_transport_offset(skb);
1246 tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data;
1247 tucse = 0;
1248
1249 i = adapter->tx_ring.next_to_use;
1250 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1251 buffer_info = &adapter->tx_ring.buffer_info[i];
1252 WARN_ON(buffer_info->dma != 0);
1253
1254 context_desc->ipcss = ipcss;
1255 context_desc->ipcso = ipcso;
1256 context_desc->ipcse = cpu_to_le16(ipcse);
1257 context_desc->tucss = tucss;
1258 context_desc->tucso = tucso;
1259 context_desc->tucse = cpu_to_le16(tucse);
1260 context_desc->mss = cpu_to_le16(mss);
1261 context_desc->hdr_len = hdr_len;
1262 context_desc->status = 0;
1263 context_desc->cmd_type_len = cpu_to_le32(
1264 IXGB_CONTEXT_DESC_TYPE
1265 | IXGB_CONTEXT_DESC_CMD_TSE
1266 | IXGB_CONTEXT_DESC_CMD_IP
1267 | IXGB_CONTEXT_DESC_CMD_TCP
1268 | IXGB_CONTEXT_DESC_CMD_IDE
1269 | (skb->len - (hdr_len)));
1270
1271
1272 if (++i == adapter->tx_ring.count) i = 0;
1273 adapter->tx_ring.next_to_use = i;
1274
1275 return 1;
1276 }
1277
1278 return 0;
1279 }
1280
1281 static bool
1282 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1283 {
1284 struct ixgb_context_desc *context_desc;
1285 unsigned int i;
1286 u8 css, cso;
1287
1288 if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
1289 struct ixgb_buffer *buffer_info;
1290 css = skb_checksum_start_offset(skb);
1291 cso = css + skb->csum_offset;
1292
1293 i = adapter->tx_ring.next_to_use;
1294 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1295 buffer_info = &adapter->tx_ring.buffer_info[i];
1296 WARN_ON(buffer_info->dma != 0);
1297
1298 context_desc->tucss = css;
1299 context_desc->tucso = cso;
1300 context_desc->tucse = 0;
1301 /* zero out any previously existing data in one instruction */
1302 *(u32 *)&(context_desc->ipcss) = 0;
1303 context_desc->status = 0;
1304 context_desc->hdr_len = 0;
1305 context_desc->mss = 0;
1306 context_desc->cmd_type_len =
1307 cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1308 | IXGB_TX_DESC_CMD_IDE);
1309
1310 if (++i == adapter->tx_ring.count) i = 0;
1311 adapter->tx_ring.next_to_use = i;
1312
1313 return true;
1314 }
1315
1316 return false;
1317 }
1318
1319 #define IXGB_MAX_TXD_PWR 14
1320 #define IXGB_MAX_DATA_PER_TXD (1<<IXGB_MAX_TXD_PWR)
1321
1322 static int
1323 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1324 unsigned int first)
1325 {
1326 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1327 struct pci_dev *pdev = adapter->pdev;
1328 struct ixgb_buffer *buffer_info;
1329 int len = skb_headlen(skb);
1330 unsigned int offset = 0, size, count = 0, i;
1331 unsigned int mss = skb_shinfo(skb)->gso_size;
1332 unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1333 unsigned int f;
1334
1335 i = tx_ring->next_to_use;
1336
1337 while (len) {
1338 buffer_info = &tx_ring->buffer_info[i];
1339 size = min(len, IXGB_MAX_DATA_PER_TXD);
1340 /* Workaround for premature desc write-backs
1341 * in TSO mode. Append 4-byte sentinel desc */
1342 if (unlikely(mss && !nr_frags && size == len && size > 8))
1343 size -= 4;
1344
1345 buffer_info->length = size;
1346 WARN_ON(buffer_info->dma != 0);
1347 buffer_info->time_stamp = jiffies;
1348 buffer_info->mapped_as_page = false;
1349 buffer_info->dma = dma_map_single(&pdev->dev,
1350 skb->data + offset,
1351 size, DMA_TO_DEVICE);
1352 if (dma_mapping_error(&pdev->dev, buffer_info->dma))
1353 goto dma_error;
1354 buffer_info->next_to_watch = 0;
1355
1356 len -= size;
1357 offset += size;
1358 count++;
1359 if (len) {
1360 i++;
1361 if (i == tx_ring->count)
1362 i = 0;
1363 }
1364 }
1365
1366 for (f = 0; f < nr_frags; f++) {
1367 const struct skb_frag_struct *frag;
1368
1369 frag = &skb_shinfo(skb)->frags[f];
1370 len = skb_frag_size(frag);
1371 offset = 0;
1372
1373 while (len) {
1374 i++;
1375 if (i == tx_ring->count)
1376 i = 0;
1377
1378 buffer_info = &tx_ring->buffer_info[i];
1379 size = min(len, IXGB_MAX_DATA_PER_TXD);
1380
1381 /* Workaround for premature desc write-backs
1382 * in TSO mode. Append 4-byte sentinel desc */
1383 if (unlikely(mss && (f == (nr_frags - 1))
1384 && size == len && size > 8))
1385 size -= 4;
1386
1387 buffer_info->length = size;
1388 buffer_info->time_stamp = jiffies;
1389 buffer_info->mapped_as_page = true;
1390 buffer_info->dma =
1391 skb_frag_dma_map(&pdev->dev, frag, offset, size,
1392 DMA_TO_DEVICE);
1393 if (dma_mapping_error(&pdev->dev, buffer_info->dma))
1394 goto dma_error;
1395 buffer_info->next_to_watch = 0;
1396
1397 len -= size;
1398 offset += size;
1399 count++;
1400 }
1401 }
1402 tx_ring->buffer_info[i].skb = skb;
1403 tx_ring->buffer_info[first].next_to_watch = i;
1404
1405 return count;
1406
1407 dma_error:
1408 dev_err(&pdev->dev, "TX DMA map failed\n");
1409 buffer_info->dma = 0;
1410 if (count)
1411 count--;
1412
1413 while (count--) {
1414 if (i==0)
1415 i += tx_ring->count;
1416 i--;
1417 buffer_info = &tx_ring->buffer_info[i];
1418 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1419 }
1420
1421 return 0;
1422 }
1423
1424 static void
1425 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1426 {
1427 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1428 struct ixgb_tx_desc *tx_desc = NULL;
1429 struct ixgb_buffer *buffer_info;
1430 u32 cmd_type_len = adapter->tx_cmd_type;
1431 u8 status = 0;
1432 u8 popts = 0;
1433 unsigned int i;
1434
1435 if (tx_flags & IXGB_TX_FLAGS_TSO) {
1436 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1437 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1438 }
1439
1440 if (tx_flags & IXGB_TX_FLAGS_CSUM)
1441 popts |= IXGB_TX_DESC_POPTS_TXSM;
1442
1443 if (tx_flags & IXGB_TX_FLAGS_VLAN)
1444 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1445
1446 i = tx_ring->next_to_use;
1447
1448 while (count--) {
1449 buffer_info = &tx_ring->buffer_info[i];
1450 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1451 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1452 tx_desc->cmd_type_len =
1453 cpu_to_le32(cmd_type_len | buffer_info->length);
1454 tx_desc->status = status;
1455 tx_desc->popts = popts;
1456 tx_desc->vlan = cpu_to_le16(vlan_id);
1457
1458 if (++i == tx_ring->count) i = 0;
1459 }
1460
1461 tx_desc->cmd_type_len |=
1462 cpu_to_le32(IXGB_TX_DESC_CMD_EOP | IXGB_TX_DESC_CMD_RS);
1463
1464 /* Force memory writes to complete before letting h/w
1465 * know there are new descriptors to fetch. (Only
1466 * applicable for weak-ordered memory model archs,
1467 * such as IA-64). */
1468 wmb();
1469
1470 tx_ring->next_to_use = i;
1471 IXGB_WRITE_REG(&adapter->hw, TDT, i);
1472 }
1473
1474 static int __ixgb_maybe_stop_tx(struct net_device *netdev, int size)
1475 {
1476 struct ixgb_adapter *adapter = netdev_priv(netdev);
1477 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1478
1479 netif_stop_queue(netdev);
1480 /* Herbert's original patch had:
1481 * smp_mb__after_netif_stop_queue();
1482 * but since that doesn't exist yet, just open code it. */
1483 smp_mb();
1484
1485 /* We need to check again in a case another CPU has just
1486 * made room available. */
1487 if (likely(IXGB_DESC_UNUSED(tx_ring) < size))
1488 return -EBUSY;
1489
1490 /* A reprieve! */
1491 netif_start_queue(netdev);
1492 ++adapter->restart_queue;
1493 return 0;
1494 }
1495
1496 static int ixgb_maybe_stop_tx(struct net_device *netdev,
1497 struct ixgb_desc_ring *tx_ring, int size)
1498 {
1499 if (likely(IXGB_DESC_UNUSED(tx_ring) >= size))
1500 return 0;
1501 return __ixgb_maybe_stop_tx(netdev, size);
1502 }
1503
1504
1505 /* Tx Descriptors needed, worst case */
1506 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1507 (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1508 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) /* skb->date */ + \
1509 MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 /* for context */ \
1510 + 1 /* one more needed for sentinel TSO workaround */
1511
1512 static netdev_tx_t
1513 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1514 {
1515 struct ixgb_adapter *adapter = netdev_priv(netdev);
1516 unsigned int first;
1517 unsigned int tx_flags = 0;
1518 int vlan_id = 0;
1519 int count = 0;
1520 int tso;
1521
1522 if (test_bit(__IXGB_DOWN, &adapter->flags)) {
1523 dev_kfree_skb_any(skb);
1524 return NETDEV_TX_OK;
1525 }
1526
1527 if (skb->len <= 0) {
1528 dev_kfree_skb_any(skb);
1529 return NETDEV_TX_OK;
1530 }
1531
1532 if (unlikely(ixgb_maybe_stop_tx(netdev, &adapter->tx_ring,
1533 DESC_NEEDED)))
1534 return NETDEV_TX_BUSY;
1535
1536 if (skb_vlan_tag_present(skb)) {
1537 tx_flags |= IXGB_TX_FLAGS_VLAN;
1538 vlan_id = skb_vlan_tag_get(skb);
1539 }
1540
1541 first = adapter->tx_ring.next_to_use;
1542
1543 tso = ixgb_tso(adapter, skb);
1544 if (tso < 0) {
1545 dev_kfree_skb_any(skb);
1546 return NETDEV_TX_OK;
1547 }
1548
1549 if (likely(tso))
1550 tx_flags |= IXGB_TX_FLAGS_TSO;
1551 else if (ixgb_tx_csum(adapter, skb))
1552 tx_flags |= IXGB_TX_FLAGS_CSUM;
1553
1554 count = ixgb_tx_map(adapter, skb, first);
1555
1556 if (count) {
1557 ixgb_tx_queue(adapter, count, vlan_id, tx_flags);
1558 /* Make sure there is space in the ring for the next send. */
1559 ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED);
1560
1561 } else {
1562 dev_kfree_skb_any(skb);
1563 adapter->tx_ring.buffer_info[first].time_stamp = 0;
1564 adapter->tx_ring.next_to_use = first;
1565 }
1566
1567 return NETDEV_TX_OK;
1568 }
1569
1570 /**
1571 * ixgb_tx_timeout - Respond to a Tx Hang
1572 * @netdev: network interface device structure
1573 **/
1574
1575 static void
1576 ixgb_tx_timeout(struct net_device *netdev)
1577 {
1578 struct ixgb_adapter *adapter = netdev_priv(netdev);
1579
1580 /* Do the reset outside of interrupt context */
1581 schedule_work(&adapter->tx_timeout_task);
1582 }
1583
1584 static void
1585 ixgb_tx_timeout_task(struct work_struct *work)
1586 {
1587 struct ixgb_adapter *adapter =
1588 container_of(work, struct ixgb_adapter, tx_timeout_task);
1589
1590 adapter->tx_timeout_count++;
1591 ixgb_down(adapter, true);
1592 ixgb_up(adapter);
1593 }
1594
1595 /**
1596 * ixgb_get_stats - Get System Network Statistics
1597 * @netdev: network interface device structure
1598 *
1599 * Returns the address of the device statistics structure.
1600 * The statistics are actually updated from the timer callback.
1601 **/
1602
1603 static struct net_device_stats *
1604 ixgb_get_stats(struct net_device *netdev)
1605 {
1606 return &netdev->stats;
1607 }
1608
1609 /**
1610 * ixgb_change_mtu - Change the Maximum Transfer Unit
1611 * @netdev: network interface device structure
1612 * @new_mtu: new value for maximum frame size
1613 *
1614 * Returns 0 on success, negative on failure
1615 **/
1616
1617 static int
1618 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1619 {
1620 struct ixgb_adapter *adapter = netdev_priv(netdev);
1621 int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1622 int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1623
1624 /* MTU < 68 is an error for IPv4 traffic, just don't allow it */
1625 if ((new_mtu < 68) ||
1626 (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
1627 netif_err(adapter, probe, adapter->netdev,
1628 "Invalid MTU setting %d\n", new_mtu);
1629 return -EINVAL;
1630 }
1631
1632 if (old_max_frame == max_frame)
1633 return 0;
1634
1635 if (netif_running(netdev))
1636 ixgb_down(adapter, true);
1637
1638 adapter->rx_buffer_len = max_frame + 8; /* + 8 for errata */
1639
1640 netdev->mtu = new_mtu;
1641
1642 if (netif_running(netdev))
1643 ixgb_up(adapter);
1644
1645 return 0;
1646 }
1647
1648 /**
1649 * ixgb_update_stats - Update the board statistics counters.
1650 * @adapter: board private structure
1651 **/
1652
1653 void
1654 ixgb_update_stats(struct ixgb_adapter *adapter)
1655 {
1656 struct net_device *netdev = adapter->netdev;
1657 struct pci_dev *pdev = adapter->pdev;
1658
1659 /* Prevent stats update while adapter is being reset */
1660 if (pci_channel_offline(pdev))
1661 return;
1662
1663 if ((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1664 (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1665 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1666 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1667 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1668 u64 bcast = ((u64)bcast_h << 32) | bcast_l;
1669
1670 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1671 /* fix up multicast stats by removing broadcasts */
1672 if (multi >= bcast)
1673 multi -= bcast;
1674
1675 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1676 adapter->stats.mprch += (multi >> 32);
1677 adapter->stats.bprcl += bcast_l;
1678 adapter->stats.bprch += bcast_h;
1679 } else {
1680 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1681 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1682 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1683 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1684 }
1685 adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1686 adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1687 adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1688 adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1689 adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1690 adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1691 adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1692 adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1693 adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1694 adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1695 adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1696 adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1697 adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1698 adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1699 adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1700 adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1701 adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1702 adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1703 adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1704 adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1705 adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1706 adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1707 adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1708 adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1709 adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1710 adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1711 adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1712 adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1713 adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1714 adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1715 adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1716 adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1717 adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1718 adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1719 adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1720 adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1721 adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1722 adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1723 adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1724 adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1725 adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1726 adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1727 adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1728 adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1729 adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1730 adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1731 adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1732 adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1733 adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1734 adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1735 adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1736 adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1737 adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1738 adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1739 adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1740 adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1741
1742 /* Fill out the OS statistics structure */
1743
1744 netdev->stats.rx_packets = adapter->stats.gprcl;
1745 netdev->stats.tx_packets = adapter->stats.gptcl;
1746 netdev->stats.rx_bytes = adapter->stats.gorcl;
1747 netdev->stats.tx_bytes = adapter->stats.gotcl;
1748 netdev->stats.multicast = adapter->stats.mprcl;
1749 netdev->stats.collisions = 0;
1750
1751 /* ignore RLEC as it reports errors for padded (<64bytes) frames
1752 * with a length in the type/len field */
1753 netdev->stats.rx_errors =
1754 /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1755 adapter->stats.ruc +
1756 adapter->stats.roc /*+ adapter->stats.rlec */ +
1757 adapter->stats.icbc +
1758 adapter->stats.ecbc + adapter->stats.mpc;
1759
1760 /* see above
1761 * netdev->stats.rx_length_errors = adapter->stats.rlec;
1762 */
1763
1764 netdev->stats.rx_crc_errors = adapter->stats.crcerrs;
1765 netdev->stats.rx_fifo_errors = adapter->stats.mpc;
1766 netdev->stats.rx_missed_errors = adapter->stats.mpc;
1767 netdev->stats.rx_over_errors = adapter->stats.mpc;
1768
1769 netdev->stats.tx_errors = 0;
1770 netdev->stats.rx_frame_errors = 0;
1771 netdev->stats.tx_aborted_errors = 0;
1772 netdev->stats.tx_carrier_errors = 0;
1773 netdev->stats.tx_fifo_errors = 0;
1774 netdev->stats.tx_heartbeat_errors = 0;
1775 netdev->stats.tx_window_errors = 0;
1776 }
1777
1778 #define IXGB_MAX_INTR 10
1779 /**
1780 * ixgb_intr - Interrupt Handler
1781 * @irq: interrupt number
1782 * @data: pointer to a network interface device structure
1783 **/
1784
1785 static irqreturn_t
1786 ixgb_intr(int irq, void *data)
1787 {
1788 struct net_device *netdev = data;
1789 struct ixgb_adapter *adapter = netdev_priv(netdev);
1790 struct ixgb_hw *hw = &adapter->hw;
1791 u32 icr = IXGB_READ_REG(hw, ICR);
1792
1793 if (unlikely(!icr))
1794 return IRQ_NONE; /* Not our interrupt */
1795
1796 if (unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC)))
1797 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1798 mod_timer(&adapter->watchdog_timer, jiffies);
1799
1800 if (napi_schedule_prep(&adapter->napi)) {
1801
1802 /* Disable interrupts and register for poll. The flush
1803 of the posted write is intentionally left out.
1804 */
1805
1806 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1807 __napi_schedule(&adapter->napi);
1808 }
1809 return IRQ_HANDLED;
1810 }
1811
1812 /**
1813 * ixgb_clean - NAPI Rx polling callback
1814 * @adapter: board private structure
1815 **/
1816
1817 static int
1818 ixgb_clean(struct napi_struct *napi, int budget)
1819 {
1820 struct ixgb_adapter *adapter = container_of(napi, struct ixgb_adapter, napi);
1821 int work_done = 0;
1822
1823 ixgb_clean_tx_irq(adapter);
1824 ixgb_clean_rx_irq(adapter, &work_done, budget);
1825
1826 /* If budget not fully consumed, exit the polling mode */
1827 if (work_done < budget) {
1828 napi_complete(napi);
1829 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1830 ixgb_irq_enable(adapter);
1831 }
1832
1833 return work_done;
1834 }
1835
1836 /**
1837 * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1838 * @adapter: board private structure
1839 **/
1840
1841 static bool
1842 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1843 {
1844 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1845 struct net_device *netdev = adapter->netdev;
1846 struct ixgb_tx_desc *tx_desc, *eop_desc;
1847 struct ixgb_buffer *buffer_info;
1848 unsigned int i, eop;
1849 bool cleaned = false;
1850
1851 i = tx_ring->next_to_clean;
1852 eop = tx_ring->buffer_info[i].next_to_watch;
1853 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1854
1855 while (eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1856
1857 rmb(); /* read buffer_info after eop_desc */
1858 for (cleaned = false; !cleaned; ) {
1859 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1860 buffer_info = &tx_ring->buffer_info[i];
1861
1862 if (tx_desc->popts &
1863 (IXGB_TX_DESC_POPTS_TXSM |
1864 IXGB_TX_DESC_POPTS_IXSM))
1865 adapter->hw_csum_tx_good++;
1866
1867 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1868
1869 *(u32 *)&(tx_desc->status) = 0;
1870
1871 cleaned = (i == eop);
1872 if (++i == tx_ring->count) i = 0;
1873 }
1874
1875 eop = tx_ring->buffer_info[i].next_to_watch;
1876 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1877 }
1878
1879 tx_ring->next_to_clean = i;
1880
1881 if (unlikely(cleaned && netif_carrier_ok(netdev) &&
1882 IXGB_DESC_UNUSED(tx_ring) >= DESC_NEEDED)) {
1883 /* Make sure that anybody stopping the queue after this
1884 * sees the new next_to_clean. */
1885 smp_mb();
1886
1887 if (netif_queue_stopped(netdev) &&
1888 !(test_bit(__IXGB_DOWN, &adapter->flags))) {
1889 netif_wake_queue(netdev);
1890 ++adapter->restart_queue;
1891 }
1892 }
1893
1894 if (adapter->detect_tx_hung) {
1895 /* detect a transmit hang in hardware, this serializes the
1896 * check with the clearing of time_stamp and movement of i */
1897 adapter->detect_tx_hung = false;
1898 if (tx_ring->buffer_info[eop].time_stamp &&
1899 time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ)
1900 && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1901 IXGB_STATUS_TXOFF)) {
1902 /* detected Tx unit hang */
1903 netif_err(adapter, drv, adapter->netdev,
1904 "Detected Tx Unit Hang\n"
1905 " TDH <%x>\n"
1906 " TDT <%x>\n"
1907 " next_to_use <%x>\n"
1908 " next_to_clean <%x>\n"
1909 "buffer_info[next_to_clean]\n"
1910 " time_stamp <%lx>\n"
1911 " next_to_watch <%x>\n"
1912 " jiffies <%lx>\n"
1913 " next_to_watch.status <%x>\n",
1914 IXGB_READ_REG(&adapter->hw, TDH),
1915 IXGB_READ_REG(&adapter->hw, TDT),
1916 tx_ring->next_to_use,
1917 tx_ring->next_to_clean,
1918 tx_ring->buffer_info[eop].time_stamp,
1919 eop,
1920 jiffies,
1921 eop_desc->status);
1922 netif_stop_queue(netdev);
1923 }
1924 }
1925
1926 return cleaned;
1927 }
1928
1929 /**
1930 * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1931 * @adapter: board private structure
1932 * @rx_desc: receive descriptor
1933 * @sk_buff: socket buffer with received data
1934 **/
1935
1936 static void
1937 ixgb_rx_checksum(struct ixgb_adapter *adapter,
1938 struct ixgb_rx_desc *rx_desc,
1939 struct sk_buff *skb)
1940 {
1941 /* Ignore Checksum bit is set OR
1942 * TCP Checksum has not been calculated
1943 */
1944 if ((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1945 (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1946 skb_checksum_none_assert(skb);
1947 return;
1948 }
1949
1950 /* At this point we know the hardware did the TCP checksum */
1951 /* now look at the TCP checksum error bit */
1952 if (rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1953 /* let the stack verify checksum errors */
1954 skb_checksum_none_assert(skb);
1955 adapter->hw_csum_rx_error++;
1956 } else {
1957 /* TCP checksum is good */
1958 skb->ip_summed = CHECKSUM_UNNECESSARY;
1959 adapter->hw_csum_rx_good++;
1960 }
1961 }
1962
1963 /*
1964 * this should improve performance for small packets with large amounts
1965 * of reassembly being done in the stack
1966 */
1967 static void ixgb_check_copybreak(struct napi_struct *napi,
1968 struct ixgb_buffer *buffer_info,
1969 u32 length, struct sk_buff **skb)
1970 {
1971 struct sk_buff *new_skb;
1972
1973 if (length > copybreak)
1974 return;
1975
1976 new_skb = napi_alloc_skb(napi, length);
1977 if (!new_skb)
1978 return;
1979
1980 skb_copy_to_linear_data_offset(new_skb, -NET_IP_ALIGN,
1981 (*skb)->data - NET_IP_ALIGN,
1982 length + NET_IP_ALIGN);
1983 /* save the skb in buffer_info as good */
1984 buffer_info->skb = *skb;
1985 *skb = new_skb;
1986 }
1987
1988 /**
1989 * ixgb_clean_rx_irq - Send received data up the network stack,
1990 * @adapter: board private structure
1991 **/
1992
1993 static bool
1994 ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
1995 {
1996 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1997 struct net_device *netdev = adapter->netdev;
1998 struct pci_dev *pdev = adapter->pdev;
1999 struct ixgb_rx_desc *rx_desc, *next_rxd;
2000 struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
2001 u32 length;
2002 unsigned int i, j;
2003 int cleaned_count = 0;
2004 bool cleaned = false;
2005
2006 i = rx_ring->next_to_clean;
2007 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2008 buffer_info = &rx_ring->buffer_info[i];
2009
2010 while (rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
2011 struct sk_buff *skb;
2012 u8 status;
2013
2014 if (*work_done >= work_to_do)
2015 break;
2016
2017 (*work_done)++;
2018 rmb(); /* read descriptor and rx_buffer_info after status DD */
2019 status = rx_desc->status;
2020 skb = buffer_info->skb;
2021 buffer_info->skb = NULL;
2022
2023 prefetch(skb->data - NET_IP_ALIGN);
2024
2025 if (++i == rx_ring->count)
2026 i = 0;
2027 next_rxd = IXGB_RX_DESC(*rx_ring, i);
2028 prefetch(next_rxd);
2029
2030 j = i + 1;
2031 if (j == rx_ring->count)
2032 j = 0;
2033 next2_buffer = &rx_ring->buffer_info[j];
2034 prefetch(next2_buffer);
2035
2036 next_buffer = &rx_ring->buffer_info[i];
2037
2038 cleaned = true;
2039 cleaned_count++;
2040
2041 dma_unmap_single(&pdev->dev,
2042 buffer_info->dma,
2043 buffer_info->length,
2044 DMA_FROM_DEVICE);
2045 buffer_info->dma = 0;
2046
2047 length = le16_to_cpu(rx_desc->length);
2048 rx_desc->length = 0;
2049
2050 if (unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
2051
2052 /* All receives must fit into a single buffer */
2053
2054 pr_debug("Receive packet consumed multiple buffers length<%x>\n",
2055 length);
2056
2057 dev_kfree_skb_irq(skb);
2058 goto rxdesc_done;
2059 }
2060
2061 if (unlikely(rx_desc->errors &
2062 (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE |
2063 IXGB_RX_DESC_ERRORS_P | IXGB_RX_DESC_ERRORS_RXE))) {
2064 dev_kfree_skb_irq(skb);
2065 goto rxdesc_done;
2066 }
2067
2068 ixgb_check_copybreak(&adapter->napi, buffer_info, length, &skb);
2069
2070 /* Good Receive */
2071 skb_put(skb, length);
2072
2073 /* Receive Checksum Offload */
2074 ixgb_rx_checksum(adapter, rx_desc, skb);
2075
2076 skb->protocol = eth_type_trans(skb, netdev);
2077 if (status & IXGB_RX_DESC_STATUS_VP)
2078 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
2079 le16_to_cpu(rx_desc->special));
2080
2081 netif_receive_skb(skb);
2082
2083 rxdesc_done:
2084 /* clean up descriptor, might be written over by hw */
2085 rx_desc->status = 0;
2086
2087 /* return some buffers to hardware, one at a time is too slow */
2088 if (unlikely(cleaned_count >= IXGB_RX_BUFFER_WRITE)) {
2089 ixgb_alloc_rx_buffers(adapter, cleaned_count);
2090 cleaned_count = 0;
2091 }
2092
2093 /* use prefetched values */
2094 rx_desc = next_rxd;
2095 buffer_info = next_buffer;
2096 }
2097
2098 rx_ring->next_to_clean = i;
2099
2100 cleaned_count = IXGB_DESC_UNUSED(rx_ring);
2101 if (cleaned_count)
2102 ixgb_alloc_rx_buffers(adapter, cleaned_count);
2103
2104 return cleaned;
2105 }
2106
2107 /**
2108 * ixgb_alloc_rx_buffers - Replace used receive buffers
2109 * @adapter: address of board private structure
2110 **/
2111
2112 static void
2113 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter, int cleaned_count)
2114 {
2115 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2116 struct net_device *netdev = adapter->netdev;
2117 struct pci_dev *pdev = adapter->pdev;
2118 struct ixgb_rx_desc *rx_desc;
2119 struct ixgb_buffer *buffer_info;
2120 struct sk_buff *skb;
2121 unsigned int i;
2122 long cleancount;
2123
2124 i = rx_ring->next_to_use;
2125 buffer_info = &rx_ring->buffer_info[i];
2126 cleancount = IXGB_DESC_UNUSED(rx_ring);
2127
2128
2129 /* leave three descriptors unused */
2130 while (--cleancount > 2 && cleaned_count--) {
2131 /* recycle! its good for you */
2132 skb = buffer_info->skb;
2133 if (skb) {
2134 skb_trim(skb, 0);
2135 goto map_skb;
2136 }
2137
2138 skb = netdev_alloc_skb_ip_align(netdev, adapter->rx_buffer_len);
2139 if (unlikely(!skb)) {
2140 /* Better luck next round */
2141 adapter->alloc_rx_buff_failed++;
2142 break;
2143 }
2144
2145 buffer_info->skb = skb;
2146 buffer_info->length = adapter->rx_buffer_len;
2147 map_skb:
2148 buffer_info->dma = dma_map_single(&pdev->dev,
2149 skb->data,
2150 adapter->rx_buffer_len,
2151 DMA_FROM_DEVICE);
2152 if (dma_mapping_error(&pdev->dev, buffer_info->dma)) {
2153 adapter->alloc_rx_buff_failed++;
2154 break;
2155 }
2156
2157 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2158 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
2159 /* guarantee DD bit not set now before h/w gets descriptor
2160 * this is the rest of the workaround for h/w double
2161 * writeback. */
2162 rx_desc->status = 0;
2163
2164
2165 if (++i == rx_ring->count)
2166 i = 0;
2167 buffer_info = &rx_ring->buffer_info[i];
2168 }
2169
2170 if (likely(rx_ring->next_to_use != i)) {
2171 rx_ring->next_to_use = i;
2172 if (unlikely(i-- == 0))
2173 i = (rx_ring->count - 1);
2174
2175 /* Force memory writes to complete before letting h/w
2176 * know there are new descriptors to fetch. (Only
2177 * applicable for weak-ordered memory model archs, such
2178 * as IA-64). */
2179 wmb();
2180 IXGB_WRITE_REG(&adapter->hw, RDT, i);
2181 }
2182 }
2183
2184 static void
2185 ixgb_vlan_strip_enable(struct ixgb_adapter *adapter)
2186 {
2187 u32 ctrl;
2188
2189 /* enable VLAN tag insert/strip */
2190 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2191 ctrl |= IXGB_CTRL0_VME;
2192 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2193 }
2194
2195 static void
2196 ixgb_vlan_strip_disable(struct ixgb_adapter *adapter)
2197 {
2198 u32 ctrl;
2199
2200 /* disable VLAN tag insert/strip */
2201 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2202 ctrl &= ~IXGB_CTRL0_VME;
2203 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2204 }
2205
2206 static int
2207 ixgb_vlan_rx_add_vid(struct net_device *netdev, __be16 proto, u16 vid)
2208 {
2209 struct ixgb_adapter *adapter = netdev_priv(netdev);
2210 u32 vfta, index;
2211
2212 /* add VID to filter table */
2213
2214 index = (vid >> 5) & 0x7F;
2215 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2216 vfta |= (1 << (vid & 0x1F));
2217 ixgb_write_vfta(&adapter->hw, index, vfta);
2218 set_bit(vid, adapter->active_vlans);
2219
2220 return 0;
2221 }
2222
2223 static int
2224 ixgb_vlan_rx_kill_vid(struct net_device *netdev, __be16 proto, u16 vid)
2225 {
2226 struct ixgb_adapter *adapter = netdev_priv(netdev);
2227 u32 vfta, index;
2228
2229 /* remove VID from filter table */
2230
2231 index = (vid >> 5) & 0x7F;
2232 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2233 vfta &= ~(1 << (vid & 0x1F));
2234 ixgb_write_vfta(&adapter->hw, index, vfta);
2235 clear_bit(vid, adapter->active_vlans);
2236
2237 return 0;
2238 }
2239
2240 static void
2241 ixgb_restore_vlan(struct ixgb_adapter *adapter)
2242 {
2243 u16 vid;
2244
2245 for_each_set_bit(vid, adapter->active_vlans, VLAN_N_VID)
2246 ixgb_vlan_rx_add_vid(adapter->netdev, htons(ETH_P_8021Q), vid);
2247 }
2248
2249 #ifdef CONFIG_NET_POLL_CONTROLLER
2250 /*
2251 * Polling 'interrupt' - used by things like netconsole to send skbs
2252 * without having to re-enable interrupts. It's not called while
2253 * the interrupt routine is executing.
2254 */
2255
2256 static void ixgb_netpoll(struct net_device *dev)
2257 {
2258 struct ixgb_adapter *adapter = netdev_priv(dev);
2259
2260 disable_irq(adapter->pdev->irq);
2261 ixgb_intr(adapter->pdev->irq, dev);
2262 enable_irq(adapter->pdev->irq);
2263 }
2264 #endif
2265
2266 /**
2267 * ixgb_io_error_detected - called when PCI error is detected
2268 * @pdev: pointer to pci device with error
2269 * @state: pci channel state after error
2270 *
2271 * This callback is called by the PCI subsystem whenever
2272 * a PCI bus error is detected.
2273 */
2274 static pci_ers_result_t ixgb_io_error_detected(struct pci_dev *pdev,
2275 enum pci_channel_state state)
2276 {
2277 struct net_device *netdev = pci_get_drvdata(pdev);
2278 struct ixgb_adapter *adapter = netdev_priv(netdev);
2279
2280 netif_device_detach(netdev);
2281
2282 if (state == pci_channel_io_perm_failure)
2283 return PCI_ERS_RESULT_DISCONNECT;
2284
2285 if (netif_running(netdev))
2286 ixgb_down(adapter, true);
2287
2288 pci_disable_device(pdev);
2289
2290 /* Request a slot reset. */
2291 return PCI_ERS_RESULT_NEED_RESET;
2292 }
2293
2294 /**
2295 * ixgb_io_slot_reset - called after the pci bus has been reset.
2296 * @pdev pointer to pci device with error
2297 *
2298 * This callback is called after the PCI bus has been reset.
2299 * Basically, this tries to restart the card from scratch.
2300 * This is a shortened version of the device probe/discovery code,
2301 * it resembles the first-half of the ixgb_probe() routine.
2302 */
2303 static pci_ers_result_t ixgb_io_slot_reset(struct pci_dev *pdev)
2304 {
2305 struct net_device *netdev = pci_get_drvdata(pdev);
2306 struct ixgb_adapter *adapter = netdev_priv(netdev);
2307
2308 if (pci_enable_device(pdev)) {
2309 netif_err(adapter, probe, adapter->netdev,
2310 "Cannot re-enable PCI device after reset\n");
2311 return PCI_ERS_RESULT_DISCONNECT;
2312 }
2313
2314 /* Perform card reset only on one instance of the card */
2315 if (0 != PCI_FUNC (pdev->devfn))
2316 return PCI_ERS_RESULT_RECOVERED;
2317
2318 pci_set_master(pdev);
2319
2320 netif_carrier_off(netdev);
2321 netif_stop_queue(netdev);
2322 ixgb_reset(adapter);
2323
2324 /* Make sure the EEPROM is good */
2325 if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
2326 netif_err(adapter, probe, adapter->netdev,
2327 "After reset, the EEPROM checksum is not valid\n");
2328 return PCI_ERS_RESULT_DISCONNECT;
2329 }
2330 ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
2331 memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
2332
2333 if (!is_valid_ether_addr(netdev->perm_addr)) {
2334 netif_err(adapter, probe, adapter->netdev,
2335 "After reset, invalid MAC address\n");
2336 return PCI_ERS_RESULT_DISCONNECT;
2337 }
2338
2339 return PCI_ERS_RESULT_RECOVERED;
2340 }
2341
2342 /**
2343 * ixgb_io_resume - called when its OK to resume normal operations
2344 * @pdev pointer to pci device with error
2345 *
2346 * The error recovery driver tells us that its OK to resume
2347 * normal operation. Implementation resembles the second-half
2348 * of the ixgb_probe() routine.
2349 */
2350 static void ixgb_io_resume(struct pci_dev *pdev)
2351 {
2352 struct net_device *netdev = pci_get_drvdata(pdev);
2353 struct ixgb_adapter *adapter = netdev_priv(netdev);
2354
2355 pci_set_master(pdev);
2356
2357 if (netif_running(netdev)) {
2358 if (ixgb_up(adapter)) {
2359 pr_err("can't bring device back up after reset\n");
2360 return;
2361 }
2362 }
2363
2364 netif_device_attach(netdev);
2365 mod_timer(&adapter->watchdog_timer, jiffies);
2366 }
2367
2368 /* ixgb_main.c */
Linux with added FPC-III support