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[mirror_ubuntu-bionic-kernel.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,
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 napi_disable(&adapter->napi);
289 /* waiting for NAPI to complete can re-enable interrupts */
290 ixgb_irq_disable(adapter);
291 free_irq(adapter->pdev->irq, netdev);
292
293 if (adapter->have_msi)
294 pci_disable_msi(adapter->pdev);
295
296 if (kill_watchdog)
297 del_timer_sync(&adapter->watchdog_timer);
298
299 adapter->link_speed = 0;
300 adapter->link_duplex = 0;
301 netif_carrier_off(netdev);
302 netif_stop_queue(netdev);
303
304 ixgb_reset(adapter);
305 ixgb_clean_tx_ring(adapter);
306 ixgb_clean_rx_ring(adapter);
307 }
308
309 void
310 ixgb_reset(struct ixgb_adapter *adapter)
311 {
312 struct ixgb_hw *hw = &adapter->hw;
313
314 ixgb_adapter_stop(hw);
315 if (!ixgb_init_hw(hw))
316 netif_err(adapter, probe, adapter->netdev, "ixgb_init_hw failed\n");
317
318 /* restore frame size information */
319 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
320 if (hw->max_frame_size >
321 IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
322 u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
323 if (!(ctrl0 & IXGB_CTRL0_JFE)) {
324 ctrl0 |= IXGB_CTRL0_JFE;
325 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
326 }
327 }
328 }
329
330 static netdev_features_t
331 ixgb_fix_features(struct net_device *netdev, netdev_features_t features)
332 {
333 /*
334 * Tx VLAN insertion does not work per HW design when Rx stripping is
335 * disabled.
336 */
337 if (!(features & NETIF_F_HW_VLAN_CTAG_RX))
338 features &= ~NETIF_F_HW_VLAN_CTAG_TX;
339
340 return features;
341 }
342
343 static int
344 ixgb_set_features(struct net_device *netdev, netdev_features_t features)
345 {
346 struct ixgb_adapter *adapter = netdev_priv(netdev);
347 netdev_features_t changed = features ^ netdev->features;
348
349 if (!(changed & (NETIF_F_RXCSUM|NETIF_F_HW_VLAN_CTAG_RX)))
350 return 0;
351
352 adapter->rx_csum = !!(features & NETIF_F_RXCSUM);
353
354 if (netif_running(netdev)) {
355 ixgb_down(adapter, true);
356 ixgb_up(adapter);
357 ixgb_set_speed_duplex(netdev);
358 } else
359 ixgb_reset(adapter);
360
361 return 0;
362 }
363
364
365 static const struct net_device_ops ixgb_netdev_ops = {
366 .ndo_open = ixgb_open,
367 .ndo_stop = ixgb_close,
368 .ndo_start_xmit = ixgb_xmit_frame,
369 .ndo_get_stats = ixgb_get_stats,
370 .ndo_set_rx_mode = ixgb_set_multi,
371 .ndo_validate_addr = eth_validate_addr,
372 .ndo_set_mac_address = ixgb_set_mac,
373 .ndo_change_mtu = ixgb_change_mtu,
374 .ndo_tx_timeout = ixgb_tx_timeout,
375 .ndo_vlan_rx_add_vid = ixgb_vlan_rx_add_vid,
376 .ndo_vlan_rx_kill_vid = ixgb_vlan_rx_kill_vid,
377 #ifdef CONFIG_NET_POLL_CONTROLLER
378 .ndo_poll_controller = ixgb_netpoll,
379 #endif
380 .ndo_fix_features = ixgb_fix_features,
381 .ndo_set_features = ixgb_set_features,
382 };
383
384 /**
385 * ixgb_probe - Device Initialization Routine
386 * @pdev: PCI device information struct
387 * @ent: entry in ixgb_pci_tbl
388 *
389 * Returns 0 on success, negative on failure
390 *
391 * ixgb_probe initializes an adapter identified by a pci_dev structure.
392 * The OS initialization, configuring of the adapter private structure,
393 * and a hardware reset occur.
394 **/
395
396 static int
397 ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
398 {
399 struct net_device *netdev = NULL;
400 struct ixgb_adapter *adapter;
401 static int cards_found = 0;
402 int pci_using_dac;
403 int i;
404 int err;
405
406 err = pci_enable_device(pdev);
407 if (err)
408 return err;
409
410 pci_using_dac = 0;
411 err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(64));
412 if (!err) {
413 err = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64));
414 if (!err)
415 pci_using_dac = 1;
416 } else {
417 err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
418 if (err) {
419 err = dma_set_coherent_mask(&pdev->dev,
420 DMA_BIT_MASK(32));
421 if (err) {
422 pr_err("No usable DMA configuration, aborting\n");
423 goto err_dma_mask;
424 }
425 }
426 }
427
428 err = pci_request_regions(pdev, ixgb_driver_name);
429 if (err)
430 goto err_request_regions;
431
432 pci_set_master(pdev);
433
434 netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
435 if (!netdev) {
436 err = -ENOMEM;
437 goto err_alloc_etherdev;
438 }
439
440 SET_NETDEV_DEV(netdev, &pdev->dev);
441
442 pci_set_drvdata(pdev, netdev);
443 adapter = netdev_priv(netdev);
444 adapter->netdev = netdev;
445 adapter->pdev = pdev;
446 adapter->hw.back = adapter;
447 adapter->msg_enable = netif_msg_init(debug, DEFAULT_MSG_ENABLE);
448
449 adapter->hw.hw_addr = pci_ioremap_bar(pdev, BAR_0);
450 if (!adapter->hw.hw_addr) {
451 err = -EIO;
452 goto err_ioremap;
453 }
454
455 for (i = BAR_1; i <= BAR_5; i++) {
456 if (pci_resource_len(pdev, i) == 0)
457 continue;
458 if (pci_resource_flags(pdev, i) & IORESOURCE_IO) {
459 adapter->hw.io_base = pci_resource_start(pdev, i);
460 break;
461 }
462 }
463
464 netdev->netdev_ops = &ixgb_netdev_ops;
465 ixgb_set_ethtool_ops(netdev);
466 netdev->watchdog_timeo = 5 * HZ;
467 netif_napi_add(netdev, &adapter->napi, ixgb_clean, 64);
468
469 strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
470
471 adapter->bd_number = cards_found;
472 adapter->link_speed = 0;
473 adapter->link_duplex = 0;
474
475 /* setup the private structure */
476
477 err = ixgb_sw_init(adapter);
478 if (err)
479 goto err_sw_init;
480
481 netdev->hw_features = NETIF_F_SG |
482 NETIF_F_TSO |
483 NETIF_F_HW_CSUM |
484 NETIF_F_HW_VLAN_CTAG_TX |
485 NETIF_F_HW_VLAN_CTAG_RX;
486 netdev->features = netdev->hw_features |
487 NETIF_F_HW_VLAN_CTAG_FILTER;
488 netdev->hw_features |= NETIF_F_RXCSUM;
489
490 if (pci_using_dac) {
491 netdev->features |= NETIF_F_HIGHDMA;
492 netdev->vlan_features |= NETIF_F_HIGHDMA;
493 }
494
495 /* make sure the EEPROM is good */
496
497 if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
498 netif_err(adapter, probe, adapter->netdev,
499 "The EEPROM Checksum Is Not Valid\n");
500 err = -EIO;
501 goto err_eeprom;
502 }
503
504 ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
505
506 if (!is_valid_ether_addr(netdev->dev_addr)) {
507 netif_err(adapter, probe, adapter->netdev, "Invalid MAC Address\n");
508 err = -EIO;
509 goto err_eeprom;
510 }
511
512 adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
513
514 init_timer(&adapter->watchdog_timer);
515 adapter->watchdog_timer.function = ixgb_watchdog;
516 adapter->watchdog_timer.data = (unsigned long)adapter;
517
518 INIT_WORK(&adapter->tx_timeout_task, ixgb_tx_timeout_task);
519
520 strcpy(netdev->name, "eth%d");
521 err = register_netdev(netdev);
522 if (err)
523 goto err_register;
524
525 /* carrier off reporting is important to ethtool even BEFORE open */
526 netif_carrier_off(netdev);
527
528 netif_info(adapter, probe, adapter->netdev,
529 "Intel(R) PRO/10GbE Network Connection\n");
530 ixgb_check_options(adapter);
531 /* reset the hardware with the new settings */
532
533 ixgb_reset(adapter);
534
535 cards_found++;
536 return 0;
537
538 err_register:
539 err_sw_init:
540 err_eeprom:
541 iounmap(adapter->hw.hw_addr);
542 err_ioremap:
543 free_netdev(netdev);
544 err_alloc_etherdev:
545 pci_release_regions(pdev);
546 err_request_regions:
547 err_dma_mask:
548 pci_disable_device(pdev);
549 return err;
550 }
551
552 /**
553 * ixgb_remove - Device Removal Routine
554 * @pdev: PCI device information struct
555 *
556 * ixgb_remove is called by the PCI subsystem to alert the driver
557 * that it should release a PCI device. The could be caused by a
558 * Hot-Plug event, or because the driver is going to be removed from
559 * memory.
560 **/
561
562 static void
563 ixgb_remove(struct pci_dev *pdev)
564 {
565 struct net_device *netdev = pci_get_drvdata(pdev);
566 struct ixgb_adapter *adapter = netdev_priv(netdev);
567
568 cancel_work_sync(&adapter->tx_timeout_task);
569
570 unregister_netdev(netdev);
571
572 iounmap(adapter->hw.hw_addr);
573 pci_release_regions(pdev);
574
575 free_netdev(netdev);
576 pci_disable_device(pdev);
577 }
578
579 /**
580 * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
581 * @adapter: board private structure to initialize
582 *
583 * ixgb_sw_init initializes the Adapter private data structure.
584 * Fields are initialized based on PCI device information and
585 * OS network device settings (MTU size).
586 **/
587
588 static int
589 ixgb_sw_init(struct ixgb_adapter *adapter)
590 {
591 struct ixgb_hw *hw = &adapter->hw;
592 struct net_device *netdev = adapter->netdev;
593 struct pci_dev *pdev = adapter->pdev;
594
595 /* PCI config space info */
596
597 hw->vendor_id = pdev->vendor;
598 hw->device_id = pdev->device;
599 hw->subsystem_vendor_id = pdev->subsystem_vendor;
600 hw->subsystem_id = pdev->subsystem_device;
601
602 hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
603 adapter->rx_buffer_len = hw->max_frame_size + 8; /* + 8 for errata */
604
605 if ((hw->device_id == IXGB_DEVICE_ID_82597EX) ||
606 (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4) ||
607 (hw->device_id == IXGB_DEVICE_ID_82597EX_LR) ||
608 (hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
609 hw->mac_type = ixgb_82597;
610 else {
611 /* should never have loaded on this device */
612 netif_err(adapter, probe, adapter->netdev, "unsupported device id\n");
613 }
614
615 /* enable flow control to be programmed */
616 hw->fc.send_xon = 1;
617
618 set_bit(__IXGB_DOWN, &adapter->flags);
619 return 0;
620 }
621
622 /**
623 * ixgb_open - Called when a network interface is made active
624 * @netdev: network interface device structure
625 *
626 * Returns 0 on success, negative value on failure
627 *
628 * The open entry point is called when a network interface is made
629 * active by the system (IFF_UP). At this point all resources needed
630 * for transmit and receive operations are allocated, the interrupt
631 * handler is registered with the OS, the watchdog timer is started,
632 * and the stack is notified that the interface is ready.
633 **/
634
635 static int
636 ixgb_open(struct net_device *netdev)
637 {
638 struct ixgb_adapter *adapter = netdev_priv(netdev);
639 int err;
640
641 /* allocate transmit descriptors */
642 err = ixgb_setup_tx_resources(adapter);
643 if (err)
644 goto err_setup_tx;
645
646 netif_carrier_off(netdev);
647
648 /* allocate receive descriptors */
649
650 err = ixgb_setup_rx_resources(adapter);
651 if (err)
652 goto err_setup_rx;
653
654 err = ixgb_up(adapter);
655 if (err)
656 goto err_up;
657
658 netif_start_queue(netdev);
659
660 return 0;
661
662 err_up:
663 ixgb_free_rx_resources(adapter);
664 err_setup_rx:
665 ixgb_free_tx_resources(adapter);
666 err_setup_tx:
667 ixgb_reset(adapter);
668
669 return err;
670 }
671
672 /**
673 * ixgb_close - Disables a network interface
674 * @netdev: network interface device structure
675 *
676 * Returns 0, this is not allowed to fail
677 *
678 * The close entry point is called when an interface is de-activated
679 * by the OS. The hardware is still under the drivers control, but
680 * needs to be disabled. A global MAC reset is issued to stop the
681 * hardware, and all transmit and receive resources are freed.
682 **/
683
684 static int
685 ixgb_close(struct net_device *netdev)
686 {
687 struct ixgb_adapter *adapter = netdev_priv(netdev);
688
689 ixgb_down(adapter, true);
690
691 ixgb_free_tx_resources(adapter);
692 ixgb_free_rx_resources(adapter);
693
694 return 0;
695 }
696
697 /**
698 * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
699 * @adapter: board private structure
700 *
701 * Return 0 on success, negative on failure
702 **/
703
704 int
705 ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
706 {
707 struct ixgb_desc_ring *txdr = &adapter->tx_ring;
708 struct pci_dev *pdev = adapter->pdev;
709 int size;
710
711 size = sizeof(struct ixgb_buffer) * txdr->count;
712 txdr->buffer_info = vzalloc(size);
713 if (!txdr->buffer_info)
714 return -ENOMEM;
715
716 /* round up to nearest 4K */
717
718 txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
719 txdr->size = ALIGN(txdr->size, 4096);
720
721 txdr->desc = dma_alloc_coherent(&pdev->dev, txdr->size, &txdr->dma,
722 GFP_KERNEL | __GFP_ZERO);
723 if (!txdr->desc) {
724 vfree(txdr->buffer_info);
725 return -ENOMEM;
726 }
727
728 txdr->next_to_use = 0;
729 txdr->next_to_clean = 0;
730
731 return 0;
732 }
733
734 /**
735 * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
736 * @adapter: board private structure
737 *
738 * Configure the Tx unit of the MAC after a reset.
739 **/
740
741 static void
742 ixgb_configure_tx(struct ixgb_adapter *adapter)
743 {
744 u64 tdba = adapter->tx_ring.dma;
745 u32 tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
746 u32 tctl;
747 struct ixgb_hw *hw = &adapter->hw;
748
749 /* Setup the Base and Length of the Tx Descriptor Ring
750 * tx_ring.dma can be either a 32 or 64 bit value
751 */
752
753 IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
754 IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
755
756 IXGB_WRITE_REG(hw, TDLEN, tdlen);
757
758 /* Setup the HW Tx Head and Tail descriptor pointers */
759
760 IXGB_WRITE_REG(hw, TDH, 0);
761 IXGB_WRITE_REG(hw, TDT, 0);
762
763 /* don't set up txdctl, it induces performance problems if configured
764 * incorrectly */
765 /* Set the Tx Interrupt Delay register */
766
767 IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
768
769 /* Program the Transmit Control Register */
770
771 tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
772 IXGB_WRITE_REG(hw, TCTL, tctl);
773
774 /* Setup Transmit Descriptor Settings for this adapter */
775 adapter->tx_cmd_type =
776 IXGB_TX_DESC_TYPE |
777 (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
778 }
779
780 /**
781 * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
782 * @adapter: board private structure
783 *
784 * Returns 0 on success, negative on failure
785 **/
786
787 int
788 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
789 {
790 struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
791 struct pci_dev *pdev = adapter->pdev;
792 int size;
793
794 size = sizeof(struct ixgb_buffer) * rxdr->count;
795 rxdr->buffer_info = vzalloc(size);
796 if (!rxdr->buffer_info)
797 return -ENOMEM;
798
799 /* Round up to nearest 4K */
800
801 rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
802 rxdr->size = ALIGN(rxdr->size, 4096);
803
804 rxdr->desc = dma_alloc_coherent(&pdev->dev, rxdr->size, &rxdr->dma,
805 GFP_KERNEL);
806
807 if (!rxdr->desc) {
808 vfree(rxdr->buffer_info);
809 return -ENOMEM;
810 }
811 memset(rxdr->desc, 0, rxdr->size);
812
813 rxdr->next_to_clean = 0;
814 rxdr->next_to_use = 0;
815
816 return 0;
817 }
818
819 /**
820 * ixgb_setup_rctl - configure the receive control register
821 * @adapter: Board private structure
822 **/
823
824 static void
825 ixgb_setup_rctl(struct ixgb_adapter *adapter)
826 {
827 u32 rctl;
828
829 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
830
831 rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
832
833 rctl |=
834 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
835 IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
836 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
837
838 rctl |= IXGB_RCTL_SECRC;
839
840 if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048)
841 rctl |= IXGB_RCTL_BSIZE_2048;
842 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096)
843 rctl |= IXGB_RCTL_BSIZE_4096;
844 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192)
845 rctl |= IXGB_RCTL_BSIZE_8192;
846 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384)
847 rctl |= IXGB_RCTL_BSIZE_16384;
848
849 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
850 }
851
852 /**
853 * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
854 * @adapter: board private structure
855 *
856 * Configure the Rx unit of the MAC after a reset.
857 **/
858
859 static void
860 ixgb_configure_rx(struct ixgb_adapter *adapter)
861 {
862 u64 rdba = adapter->rx_ring.dma;
863 u32 rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
864 struct ixgb_hw *hw = &adapter->hw;
865 u32 rctl;
866 u32 rxcsum;
867
868 /* make sure receives are disabled while setting up the descriptors */
869
870 rctl = IXGB_READ_REG(hw, RCTL);
871 IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
872
873 /* set the Receive Delay Timer Register */
874
875 IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
876
877 /* Setup the Base and Length of the Rx Descriptor Ring */
878
879 IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
880 IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
881
882 IXGB_WRITE_REG(hw, RDLEN, rdlen);
883
884 /* Setup the HW Rx Head and Tail Descriptor Pointers */
885 IXGB_WRITE_REG(hw, RDH, 0);
886 IXGB_WRITE_REG(hw, RDT, 0);
887
888 /* due to the hardware errata with RXDCTL, we are unable to use any of
889 * the performance enhancing features of it without causing other
890 * subtle bugs, some of the bugs could include receive length
891 * corruption at high data rates (WTHRESH > 0) and/or receive
892 * descriptor ring irregularites (particularly in hardware cache) */
893 IXGB_WRITE_REG(hw, RXDCTL, 0);
894
895 /* Enable Receive Checksum Offload for TCP and UDP */
896 if (adapter->rx_csum) {
897 rxcsum = IXGB_READ_REG(hw, RXCSUM);
898 rxcsum |= IXGB_RXCSUM_TUOFL;
899 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
900 }
901
902 /* Enable Receives */
903
904 IXGB_WRITE_REG(hw, RCTL, rctl);
905 }
906
907 /**
908 * ixgb_free_tx_resources - Free Tx Resources
909 * @adapter: board private structure
910 *
911 * Free all transmit software resources
912 **/
913
914 void
915 ixgb_free_tx_resources(struct ixgb_adapter *adapter)
916 {
917 struct pci_dev *pdev = adapter->pdev;
918
919 ixgb_clean_tx_ring(adapter);
920
921 vfree(adapter->tx_ring.buffer_info);
922 adapter->tx_ring.buffer_info = NULL;
923
924 dma_free_coherent(&pdev->dev, adapter->tx_ring.size,
925 adapter->tx_ring.desc, adapter->tx_ring.dma);
926
927 adapter->tx_ring.desc = NULL;
928 }
929
930 static void
931 ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
932 struct ixgb_buffer *buffer_info)
933 {
934 if (buffer_info->dma) {
935 if (buffer_info->mapped_as_page)
936 dma_unmap_page(&adapter->pdev->dev, buffer_info->dma,
937 buffer_info->length, DMA_TO_DEVICE);
938 else
939 dma_unmap_single(&adapter->pdev->dev, buffer_info->dma,
940 buffer_info->length, DMA_TO_DEVICE);
941 buffer_info->dma = 0;
942 }
943
944 if (buffer_info->skb) {
945 dev_kfree_skb_any(buffer_info->skb);
946 buffer_info->skb = NULL;
947 }
948 buffer_info->time_stamp = 0;
949 /* these fields must always be initialized in tx
950 * buffer_info->length = 0;
951 * buffer_info->next_to_watch = 0; */
952 }
953
954 /**
955 * ixgb_clean_tx_ring - Free Tx Buffers
956 * @adapter: board private structure
957 **/
958
959 static void
960 ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
961 {
962 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
963 struct ixgb_buffer *buffer_info;
964 unsigned long size;
965 unsigned int i;
966
967 /* Free all the Tx ring sk_buffs */
968
969 for (i = 0; i < tx_ring->count; i++) {
970 buffer_info = &tx_ring->buffer_info[i];
971 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
972 }
973
974 size = sizeof(struct ixgb_buffer) * tx_ring->count;
975 memset(tx_ring->buffer_info, 0, size);
976
977 /* Zero out the descriptor ring */
978
979 memset(tx_ring->desc, 0, tx_ring->size);
980
981 tx_ring->next_to_use = 0;
982 tx_ring->next_to_clean = 0;
983
984 IXGB_WRITE_REG(&adapter->hw, TDH, 0);
985 IXGB_WRITE_REG(&adapter->hw, TDT, 0);
986 }
987
988 /**
989 * ixgb_free_rx_resources - Free Rx Resources
990 * @adapter: board private structure
991 *
992 * Free all receive software resources
993 **/
994
995 void
996 ixgb_free_rx_resources(struct ixgb_adapter *adapter)
997 {
998 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
999 struct pci_dev *pdev = adapter->pdev;
1000
1001 ixgb_clean_rx_ring(adapter);
1002
1003 vfree(rx_ring->buffer_info);
1004 rx_ring->buffer_info = NULL;
1005
1006 dma_free_coherent(&pdev->dev, rx_ring->size, rx_ring->desc,
1007 rx_ring->dma);
1008
1009 rx_ring->desc = NULL;
1010 }
1011
1012 /**
1013 * ixgb_clean_rx_ring - Free Rx Buffers
1014 * @adapter: board private structure
1015 **/
1016
1017 static void
1018 ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
1019 {
1020 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1021 struct ixgb_buffer *buffer_info;
1022 struct pci_dev *pdev = adapter->pdev;
1023 unsigned long size;
1024 unsigned int i;
1025
1026 /* Free all the Rx ring sk_buffs */
1027
1028 for (i = 0; i < rx_ring->count; i++) {
1029 buffer_info = &rx_ring->buffer_info[i];
1030 if (buffer_info->dma) {
1031 dma_unmap_single(&pdev->dev,
1032 buffer_info->dma,
1033 buffer_info->length,
1034 DMA_FROM_DEVICE);
1035 buffer_info->dma = 0;
1036 buffer_info->length = 0;
1037 }
1038
1039 if (buffer_info->skb) {
1040 dev_kfree_skb(buffer_info->skb);
1041 buffer_info->skb = NULL;
1042 }
1043 }
1044
1045 size = sizeof(struct ixgb_buffer) * rx_ring->count;
1046 memset(rx_ring->buffer_info, 0, size);
1047
1048 /* Zero out the descriptor ring */
1049
1050 memset(rx_ring->desc, 0, rx_ring->size);
1051
1052 rx_ring->next_to_clean = 0;
1053 rx_ring->next_to_use = 0;
1054
1055 IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1056 IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1057 }
1058
1059 /**
1060 * ixgb_set_mac - Change the Ethernet Address of the NIC
1061 * @netdev: network interface device structure
1062 * @p: pointer to an address structure
1063 *
1064 * Returns 0 on success, negative on failure
1065 **/
1066
1067 static int
1068 ixgb_set_mac(struct net_device *netdev, void *p)
1069 {
1070 struct ixgb_adapter *adapter = netdev_priv(netdev);
1071 struct sockaddr *addr = p;
1072
1073 if (!is_valid_ether_addr(addr->sa_data))
1074 return -EADDRNOTAVAIL;
1075
1076 memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1077
1078 ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1079
1080 return 0;
1081 }
1082
1083 /**
1084 * ixgb_set_multi - Multicast and Promiscuous mode set
1085 * @netdev: network interface device structure
1086 *
1087 * The set_multi entry point is called whenever the multicast address
1088 * list or the network interface flags are updated. This routine is
1089 * responsible for configuring the hardware for proper multicast,
1090 * promiscuous mode, and all-multi behavior.
1091 **/
1092
1093 static void
1094 ixgb_set_multi(struct net_device *netdev)
1095 {
1096 struct ixgb_adapter *adapter = netdev_priv(netdev);
1097 struct ixgb_hw *hw = &adapter->hw;
1098 struct netdev_hw_addr *ha;
1099 u32 rctl;
1100
1101 /* Check for Promiscuous and All Multicast modes */
1102
1103 rctl = IXGB_READ_REG(hw, RCTL);
1104
1105 if (netdev->flags & IFF_PROMISC) {
1106 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1107 /* disable VLAN filtering */
1108 rctl &= ~IXGB_RCTL_CFIEN;
1109 rctl &= ~IXGB_RCTL_VFE;
1110 } else {
1111 if (netdev->flags & IFF_ALLMULTI) {
1112 rctl |= IXGB_RCTL_MPE;
1113 rctl &= ~IXGB_RCTL_UPE;
1114 } else {
1115 rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1116 }
1117 /* enable VLAN filtering */
1118 rctl |= IXGB_RCTL_VFE;
1119 rctl &= ~IXGB_RCTL_CFIEN;
1120 }
1121
1122 if (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1123 rctl |= IXGB_RCTL_MPE;
1124 IXGB_WRITE_REG(hw, RCTL, rctl);
1125 } else {
1126 u8 *mta = kmalloc(IXGB_MAX_NUM_MULTICAST_ADDRESSES *
1127 ETH_ALEN, GFP_ATOMIC);
1128 u8 *addr;
1129 if (!mta)
1130 goto alloc_failed;
1131
1132 IXGB_WRITE_REG(hw, RCTL, rctl);
1133
1134 addr = mta;
1135 netdev_for_each_mc_addr(ha, netdev) {
1136 memcpy(addr, ha->addr, ETH_ALEN);
1137 addr += ETH_ALEN;
1138 }
1139
1140 ixgb_mc_addr_list_update(hw, mta, netdev_mc_count(netdev), 0);
1141 kfree(mta);
1142 }
1143
1144 alloc_failed:
1145 if (netdev->features & NETIF_F_HW_VLAN_CTAG_RX)
1146 ixgb_vlan_strip_enable(adapter);
1147 else
1148 ixgb_vlan_strip_disable(adapter);
1149
1150 }
1151
1152 /**
1153 * ixgb_watchdog - Timer Call-back
1154 * @data: pointer to netdev cast into an unsigned long
1155 **/
1156
1157 static void
1158 ixgb_watchdog(unsigned long data)
1159 {
1160 struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
1161 struct net_device *netdev = adapter->netdev;
1162 struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1163
1164 ixgb_check_for_link(&adapter->hw);
1165
1166 if (ixgb_check_for_bad_link(&adapter->hw)) {
1167 /* force the reset path */
1168 netif_stop_queue(netdev);
1169 }
1170
1171 if (adapter->hw.link_up) {
1172 if (!netif_carrier_ok(netdev)) {
1173 netdev_info(netdev,
1174 "NIC Link is Up 10 Gbps Full Duplex, Flow Control: %s\n",
1175 (adapter->hw.fc.type == ixgb_fc_full) ?
1176 "RX/TX" :
1177 (adapter->hw.fc.type == ixgb_fc_rx_pause) ?
1178 "RX" :
1179 (adapter->hw.fc.type == ixgb_fc_tx_pause) ?
1180 "TX" : "None");
1181 adapter->link_speed = 10000;
1182 adapter->link_duplex = FULL_DUPLEX;
1183 netif_carrier_on(netdev);
1184 }
1185 } else {
1186 if (netif_carrier_ok(netdev)) {
1187 adapter->link_speed = 0;
1188 adapter->link_duplex = 0;
1189 netdev_info(netdev, "NIC Link is Down\n");
1190 netif_carrier_off(netdev);
1191 }
1192 }
1193
1194 ixgb_update_stats(adapter);
1195
1196 if (!netif_carrier_ok(netdev)) {
1197 if (IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1198 /* We've lost link, so the controller stops DMA,
1199 * but we've got queued Tx work that's never going
1200 * to get done, so reset controller to flush Tx.
1201 * (Do the reset outside of interrupt context). */
1202 schedule_work(&adapter->tx_timeout_task);
1203 /* return immediately since reset is imminent */
1204 return;
1205 }
1206 }
1207
1208 /* Force detection of hung controller every watchdog period */
1209 adapter->detect_tx_hung = true;
1210
1211 /* generate an interrupt to force clean up of any stragglers */
1212 IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1213
1214 /* Reset the timer */
1215 mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1216 }
1217
1218 #define IXGB_TX_FLAGS_CSUM 0x00000001
1219 #define IXGB_TX_FLAGS_VLAN 0x00000002
1220 #define IXGB_TX_FLAGS_TSO 0x00000004
1221
1222 static int
1223 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1224 {
1225 struct ixgb_context_desc *context_desc;
1226 unsigned int i;
1227 u8 ipcss, ipcso, tucss, tucso, hdr_len;
1228 u16 ipcse, tucse, mss;
1229 int err;
1230
1231 if (likely(skb_is_gso(skb))) {
1232 struct ixgb_buffer *buffer_info;
1233 struct iphdr *iph;
1234
1235 if (skb_header_cloned(skb)) {
1236 err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1237 if (err)
1238 return err;
1239 }
1240
1241 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
1242 mss = skb_shinfo(skb)->gso_size;
1243 iph = ip_hdr(skb);
1244 iph->tot_len = 0;
1245 iph->check = 0;
1246 tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
1247 iph->daddr, 0,
1248 IPPROTO_TCP, 0);
1249 ipcss = skb_network_offset(skb);
1250 ipcso = (void *)&(iph->check) - (void *)skb->data;
1251 ipcse = skb_transport_offset(skb) - 1;
1252 tucss = skb_transport_offset(skb);
1253 tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data;
1254 tucse = 0;
1255
1256 i = adapter->tx_ring.next_to_use;
1257 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1258 buffer_info = &adapter->tx_ring.buffer_info[i];
1259 WARN_ON(buffer_info->dma != 0);
1260
1261 context_desc->ipcss = ipcss;
1262 context_desc->ipcso = ipcso;
1263 context_desc->ipcse = cpu_to_le16(ipcse);
1264 context_desc->tucss = tucss;
1265 context_desc->tucso = tucso;
1266 context_desc->tucse = cpu_to_le16(tucse);
1267 context_desc->mss = cpu_to_le16(mss);
1268 context_desc->hdr_len = hdr_len;
1269 context_desc->status = 0;
1270 context_desc->cmd_type_len = cpu_to_le32(
1271 IXGB_CONTEXT_DESC_TYPE
1272 | IXGB_CONTEXT_DESC_CMD_TSE
1273 | IXGB_CONTEXT_DESC_CMD_IP
1274 | IXGB_CONTEXT_DESC_CMD_TCP
1275 | IXGB_CONTEXT_DESC_CMD_IDE
1276 | (skb->len - (hdr_len)));
1277
1278
1279 if (++i == adapter->tx_ring.count) i = 0;
1280 adapter->tx_ring.next_to_use = i;
1281
1282 return 1;
1283 }
1284
1285 return 0;
1286 }
1287
1288 static bool
1289 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1290 {
1291 struct ixgb_context_desc *context_desc;
1292 unsigned int i;
1293 u8 css, cso;
1294
1295 if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
1296 struct ixgb_buffer *buffer_info;
1297 css = skb_checksum_start_offset(skb);
1298 cso = css + skb->csum_offset;
1299
1300 i = adapter->tx_ring.next_to_use;
1301 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1302 buffer_info = &adapter->tx_ring.buffer_info[i];
1303 WARN_ON(buffer_info->dma != 0);
1304
1305 context_desc->tucss = css;
1306 context_desc->tucso = cso;
1307 context_desc->tucse = 0;
1308 /* zero out any previously existing data in one instruction */
1309 *(u32 *)&(context_desc->ipcss) = 0;
1310 context_desc->status = 0;
1311 context_desc->hdr_len = 0;
1312 context_desc->mss = 0;
1313 context_desc->cmd_type_len =
1314 cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1315 | IXGB_TX_DESC_CMD_IDE);
1316
1317 if (++i == adapter->tx_ring.count) i = 0;
1318 adapter->tx_ring.next_to_use = i;
1319
1320 return true;
1321 }
1322
1323 return false;
1324 }
1325
1326 #define IXGB_MAX_TXD_PWR 14
1327 #define IXGB_MAX_DATA_PER_TXD (1<<IXGB_MAX_TXD_PWR)
1328
1329 static int
1330 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1331 unsigned int first)
1332 {
1333 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1334 struct pci_dev *pdev = adapter->pdev;
1335 struct ixgb_buffer *buffer_info;
1336 int len = skb_headlen(skb);
1337 unsigned int offset = 0, size, count = 0, i;
1338 unsigned int mss = skb_shinfo(skb)->gso_size;
1339 unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1340 unsigned int f;
1341
1342 i = tx_ring->next_to_use;
1343
1344 while (len) {
1345 buffer_info = &tx_ring->buffer_info[i];
1346 size = min(len, IXGB_MAX_DATA_PER_TXD);
1347 /* Workaround for premature desc write-backs
1348 * in TSO mode. Append 4-byte sentinel desc */
1349 if (unlikely(mss && !nr_frags && size == len && size > 8))
1350 size -= 4;
1351
1352 buffer_info->length = size;
1353 WARN_ON(buffer_info->dma != 0);
1354 buffer_info->time_stamp = jiffies;
1355 buffer_info->mapped_as_page = false;
1356 buffer_info->dma = dma_map_single(&pdev->dev,
1357 skb->data + offset,
1358 size, DMA_TO_DEVICE);
1359 if (dma_mapping_error(&pdev->dev, buffer_info->dma))
1360 goto dma_error;
1361 buffer_info->next_to_watch = 0;
1362
1363 len -= size;
1364 offset += size;
1365 count++;
1366 if (len) {
1367 i++;
1368 if (i == tx_ring->count)
1369 i = 0;
1370 }
1371 }
1372
1373 for (f = 0; f < nr_frags; f++) {
1374 const struct skb_frag_struct *frag;
1375
1376 frag = &skb_shinfo(skb)->frags[f];
1377 len = skb_frag_size(frag);
1378 offset = 0;
1379
1380 while (len) {
1381 i++;
1382 if (i == tx_ring->count)
1383 i = 0;
1384
1385 buffer_info = &tx_ring->buffer_info[i];
1386 size = min(len, IXGB_MAX_DATA_PER_TXD);
1387
1388 /* Workaround for premature desc write-backs
1389 * in TSO mode. Append 4-byte sentinel desc */
1390 if (unlikely(mss && (f == (nr_frags - 1))
1391 && size == len && size > 8))
1392 size -= 4;
1393
1394 buffer_info->length = size;
1395 buffer_info->time_stamp = jiffies;
1396 buffer_info->mapped_as_page = true;
1397 buffer_info->dma =
1398 skb_frag_dma_map(&pdev->dev, frag, offset, size,
1399 DMA_TO_DEVICE);
1400 if (dma_mapping_error(&pdev->dev, buffer_info->dma))
1401 goto dma_error;
1402 buffer_info->next_to_watch = 0;
1403
1404 len -= size;
1405 offset += size;
1406 count++;
1407 }
1408 }
1409 tx_ring->buffer_info[i].skb = skb;
1410 tx_ring->buffer_info[first].next_to_watch = i;
1411
1412 return count;
1413
1414 dma_error:
1415 dev_err(&pdev->dev, "TX DMA map failed\n");
1416 buffer_info->dma = 0;
1417 if (count)
1418 count--;
1419
1420 while (count--) {
1421 if (i==0)
1422 i += tx_ring->count;
1423 i--;
1424 buffer_info = &tx_ring->buffer_info[i];
1425 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1426 }
1427
1428 return 0;
1429 }
1430
1431 static void
1432 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1433 {
1434 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1435 struct ixgb_tx_desc *tx_desc = NULL;
1436 struct ixgb_buffer *buffer_info;
1437 u32 cmd_type_len = adapter->tx_cmd_type;
1438 u8 status = 0;
1439 u8 popts = 0;
1440 unsigned int i;
1441
1442 if (tx_flags & IXGB_TX_FLAGS_TSO) {
1443 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1444 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1445 }
1446
1447 if (tx_flags & IXGB_TX_FLAGS_CSUM)
1448 popts |= IXGB_TX_DESC_POPTS_TXSM;
1449
1450 if (tx_flags & IXGB_TX_FLAGS_VLAN)
1451 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1452
1453 i = tx_ring->next_to_use;
1454
1455 while (count--) {
1456 buffer_info = &tx_ring->buffer_info[i];
1457 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1458 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1459 tx_desc->cmd_type_len =
1460 cpu_to_le32(cmd_type_len | buffer_info->length);
1461 tx_desc->status = status;
1462 tx_desc->popts = popts;
1463 tx_desc->vlan = cpu_to_le16(vlan_id);
1464
1465 if (++i == tx_ring->count) i = 0;
1466 }
1467
1468 tx_desc->cmd_type_len |=
1469 cpu_to_le32(IXGB_TX_DESC_CMD_EOP | IXGB_TX_DESC_CMD_RS);
1470
1471 /* Force memory writes to complete before letting h/w
1472 * know there are new descriptors to fetch. (Only
1473 * applicable for weak-ordered memory model archs,
1474 * such as IA-64). */
1475 wmb();
1476
1477 tx_ring->next_to_use = i;
1478 IXGB_WRITE_REG(&adapter->hw, TDT, i);
1479 }
1480
1481 static int __ixgb_maybe_stop_tx(struct net_device *netdev, int size)
1482 {
1483 struct ixgb_adapter *adapter = netdev_priv(netdev);
1484 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1485
1486 netif_stop_queue(netdev);
1487 /* Herbert's original patch had:
1488 * smp_mb__after_netif_stop_queue();
1489 * but since that doesn't exist yet, just open code it. */
1490 smp_mb();
1491
1492 /* We need to check again in a case another CPU has just
1493 * made room available. */
1494 if (likely(IXGB_DESC_UNUSED(tx_ring) < size))
1495 return -EBUSY;
1496
1497 /* A reprieve! */
1498 netif_start_queue(netdev);
1499 ++adapter->restart_queue;
1500 return 0;
1501 }
1502
1503 static int ixgb_maybe_stop_tx(struct net_device *netdev,
1504 struct ixgb_desc_ring *tx_ring, int size)
1505 {
1506 if (likely(IXGB_DESC_UNUSED(tx_ring) >= size))
1507 return 0;
1508 return __ixgb_maybe_stop_tx(netdev, size);
1509 }
1510
1511
1512 /* Tx Descriptors needed, worst case */
1513 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1514 (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1515 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) /* skb->date */ + \
1516 MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 /* for context */ \
1517 + 1 /* one more needed for sentinel TSO workaround */
1518
1519 static netdev_tx_t
1520 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1521 {
1522 struct ixgb_adapter *adapter = netdev_priv(netdev);
1523 unsigned int first;
1524 unsigned int tx_flags = 0;
1525 int vlan_id = 0;
1526 int count = 0;
1527 int tso;
1528
1529 if (test_bit(__IXGB_DOWN, &adapter->flags)) {
1530 dev_kfree_skb(skb);
1531 return NETDEV_TX_OK;
1532 }
1533
1534 if (skb->len <= 0) {
1535 dev_kfree_skb(skb);
1536 return NETDEV_TX_OK;
1537 }
1538
1539 if (unlikely(ixgb_maybe_stop_tx(netdev, &adapter->tx_ring,
1540 DESC_NEEDED)))
1541 return NETDEV_TX_BUSY;
1542
1543 if (vlan_tx_tag_present(skb)) {
1544 tx_flags |= IXGB_TX_FLAGS_VLAN;
1545 vlan_id = vlan_tx_tag_get(skb);
1546 }
1547
1548 first = adapter->tx_ring.next_to_use;
1549
1550 tso = ixgb_tso(adapter, skb);
1551 if (tso < 0) {
1552 dev_kfree_skb(skb);
1553 return NETDEV_TX_OK;
1554 }
1555
1556 if (likely(tso))
1557 tx_flags |= IXGB_TX_FLAGS_TSO;
1558 else if (ixgb_tx_csum(adapter, skb))
1559 tx_flags |= IXGB_TX_FLAGS_CSUM;
1560
1561 count = ixgb_tx_map(adapter, skb, first);
1562
1563 if (count) {
1564 ixgb_tx_queue(adapter, count, vlan_id, tx_flags);
1565 /* Make sure there is space in the ring for the next send. */
1566 ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED);
1567
1568 } else {
1569 dev_kfree_skb_any(skb);
1570 adapter->tx_ring.buffer_info[first].time_stamp = 0;
1571 adapter->tx_ring.next_to_use = first;
1572 }
1573
1574 return NETDEV_TX_OK;
1575 }
1576
1577 /**
1578 * ixgb_tx_timeout - Respond to a Tx Hang
1579 * @netdev: network interface device structure
1580 **/
1581
1582 static void
1583 ixgb_tx_timeout(struct net_device *netdev)
1584 {
1585 struct ixgb_adapter *adapter = netdev_priv(netdev);
1586
1587 /* Do the reset outside of interrupt context */
1588 schedule_work(&adapter->tx_timeout_task);
1589 }
1590
1591 static void
1592 ixgb_tx_timeout_task(struct work_struct *work)
1593 {
1594 struct ixgb_adapter *adapter =
1595 container_of(work, struct ixgb_adapter, tx_timeout_task);
1596
1597 adapter->tx_timeout_count++;
1598 ixgb_down(adapter, true);
1599 ixgb_up(adapter);
1600 }
1601
1602 /**
1603 * ixgb_get_stats - Get System Network Statistics
1604 * @netdev: network interface device structure
1605 *
1606 * Returns the address of the device statistics structure.
1607 * The statistics are actually updated from the timer callback.
1608 **/
1609
1610 static struct net_device_stats *
1611 ixgb_get_stats(struct net_device *netdev)
1612 {
1613 return &netdev->stats;
1614 }
1615
1616 /**
1617 * ixgb_change_mtu - Change the Maximum Transfer Unit
1618 * @netdev: network interface device structure
1619 * @new_mtu: new value for maximum frame size
1620 *
1621 * Returns 0 on success, negative on failure
1622 **/
1623
1624 static int
1625 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1626 {
1627 struct ixgb_adapter *adapter = netdev_priv(netdev);
1628 int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1629 int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1630
1631 /* MTU < 68 is an error for IPv4 traffic, just don't allow it */
1632 if ((new_mtu < 68) ||
1633 (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
1634 netif_err(adapter, probe, adapter->netdev,
1635 "Invalid MTU setting %d\n", new_mtu);
1636 return -EINVAL;
1637 }
1638
1639 if (old_max_frame == max_frame)
1640 return 0;
1641
1642 if (netif_running(netdev))
1643 ixgb_down(adapter, true);
1644
1645 adapter->rx_buffer_len = max_frame + 8; /* + 8 for errata */
1646
1647 netdev->mtu = new_mtu;
1648
1649 if (netif_running(netdev))
1650 ixgb_up(adapter);
1651
1652 return 0;
1653 }
1654
1655 /**
1656 * ixgb_update_stats - Update the board statistics counters.
1657 * @adapter: board private structure
1658 **/
1659
1660 void
1661 ixgb_update_stats(struct ixgb_adapter *adapter)
1662 {
1663 struct net_device *netdev = adapter->netdev;
1664 struct pci_dev *pdev = adapter->pdev;
1665
1666 /* Prevent stats update while adapter is being reset */
1667 if (pci_channel_offline(pdev))
1668 return;
1669
1670 if ((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1671 (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1672 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1673 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1674 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1675 u64 bcast = ((u64)bcast_h << 32) | bcast_l;
1676
1677 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1678 /* fix up multicast stats by removing broadcasts */
1679 if (multi >= bcast)
1680 multi -= bcast;
1681
1682 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1683 adapter->stats.mprch += (multi >> 32);
1684 adapter->stats.bprcl += bcast_l;
1685 adapter->stats.bprch += bcast_h;
1686 } else {
1687 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1688 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1689 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1690 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1691 }
1692 adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1693 adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1694 adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1695 adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1696 adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1697 adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1698 adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1699 adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1700 adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1701 adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1702 adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1703 adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1704 adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1705 adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1706 adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1707 adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1708 adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1709 adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1710 adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1711 adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1712 adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1713 adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1714 adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1715 adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1716 adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1717 adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1718 adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1719 adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1720 adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1721 adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1722 adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1723 adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1724 adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1725 adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1726 adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1727 adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1728 adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1729 adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1730 adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1731 adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1732 adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1733 adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1734 adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1735 adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1736 adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1737 adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1738 adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1739 adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1740 adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1741 adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1742 adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1743 adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1744 adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1745 adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1746 adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1747 adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1748
1749 /* Fill out the OS statistics structure */
1750
1751 netdev->stats.rx_packets = adapter->stats.gprcl;
1752 netdev->stats.tx_packets = adapter->stats.gptcl;
1753 netdev->stats.rx_bytes = adapter->stats.gorcl;
1754 netdev->stats.tx_bytes = adapter->stats.gotcl;
1755 netdev->stats.multicast = adapter->stats.mprcl;
1756 netdev->stats.collisions = 0;
1757
1758 /* ignore RLEC as it reports errors for padded (<64bytes) frames
1759 * with a length in the type/len field */
1760 netdev->stats.rx_errors =
1761 /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1762 adapter->stats.ruc +
1763 adapter->stats.roc /*+ adapter->stats.rlec */ +
1764 adapter->stats.icbc +
1765 adapter->stats.ecbc + adapter->stats.mpc;
1766
1767 /* see above
1768 * netdev->stats.rx_length_errors = adapter->stats.rlec;
1769 */
1770
1771 netdev->stats.rx_crc_errors = adapter->stats.crcerrs;
1772 netdev->stats.rx_fifo_errors = adapter->stats.mpc;
1773 netdev->stats.rx_missed_errors = adapter->stats.mpc;
1774 netdev->stats.rx_over_errors = adapter->stats.mpc;
1775
1776 netdev->stats.tx_errors = 0;
1777 netdev->stats.rx_frame_errors = 0;
1778 netdev->stats.tx_aborted_errors = 0;
1779 netdev->stats.tx_carrier_errors = 0;
1780 netdev->stats.tx_fifo_errors = 0;
1781 netdev->stats.tx_heartbeat_errors = 0;
1782 netdev->stats.tx_window_errors = 0;
1783 }
1784
1785 #define IXGB_MAX_INTR 10
1786 /**
1787 * ixgb_intr - Interrupt Handler
1788 * @irq: interrupt number
1789 * @data: pointer to a network interface device structure
1790 **/
1791
1792 static irqreturn_t
1793 ixgb_intr(int irq, void *data)
1794 {
1795 struct net_device *netdev = data;
1796 struct ixgb_adapter *adapter = netdev_priv(netdev);
1797 struct ixgb_hw *hw = &adapter->hw;
1798 u32 icr = IXGB_READ_REG(hw, ICR);
1799
1800 if (unlikely(!icr))
1801 return IRQ_NONE; /* Not our interrupt */
1802
1803 if (unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC)))
1804 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1805 mod_timer(&adapter->watchdog_timer, jiffies);
1806
1807 if (napi_schedule_prep(&adapter->napi)) {
1808
1809 /* Disable interrupts and register for poll. The flush
1810 of the posted write is intentionally left out.
1811 */
1812
1813 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1814 __napi_schedule(&adapter->napi);
1815 }
1816 return IRQ_HANDLED;
1817 }
1818
1819 /**
1820 * ixgb_clean - NAPI Rx polling callback
1821 * @adapter: board private structure
1822 **/
1823
1824 static int
1825 ixgb_clean(struct napi_struct *napi, int budget)
1826 {
1827 struct ixgb_adapter *adapter = container_of(napi, struct ixgb_adapter, napi);
1828 int work_done = 0;
1829
1830 ixgb_clean_tx_irq(adapter);
1831 ixgb_clean_rx_irq(adapter, &work_done, budget);
1832
1833 /* If budget not fully consumed, exit the polling mode */
1834 if (work_done < budget) {
1835 napi_complete(napi);
1836 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1837 ixgb_irq_enable(adapter);
1838 }
1839
1840 return work_done;
1841 }
1842
1843 /**
1844 * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1845 * @adapter: board private structure
1846 **/
1847
1848 static bool
1849 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1850 {
1851 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1852 struct net_device *netdev = adapter->netdev;
1853 struct ixgb_tx_desc *tx_desc, *eop_desc;
1854 struct ixgb_buffer *buffer_info;
1855 unsigned int i, eop;
1856 bool cleaned = false;
1857
1858 i = tx_ring->next_to_clean;
1859 eop = tx_ring->buffer_info[i].next_to_watch;
1860 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1861
1862 while (eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1863
1864 rmb(); /* read buffer_info after eop_desc */
1865 for (cleaned = false; !cleaned; ) {
1866 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1867 buffer_info = &tx_ring->buffer_info[i];
1868
1869 if (tx_desc->popts &
1870 (IXGB_TX_DESC_POPTS_TXSM |
1871 IXGB_TX_DESC_POPTS_IXSM))
1872 adapter->hw_csum_tx_good++;
1873
1874 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1875
1876 *(u32 *)&(tx_desc->status) = 0;
1877
1878 cleaned = (i == eop);
1879 if (++i == tx_ring->count) i = 0;
1880 }
1881
1882 eop = tx_ring->buffer_info[i].next_to_watch;
1883 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1884 }
1885
1886 tx_ring->next_to_clean = i;
1887
1888 if (unlikely(cleaned && netif_carrier_ok(netdev) &&
1889 IXGB_DESC_UNUSED(tx_ring) >= DESC_NEEDED)) {
1890 /* Make sure that anybody stopping the queue after this
1891 * sees the new next_to_clean. */
1892 smp_mb();
1893
1894 if (netif_queue_stopped(netdev) &&
1895 !(test_bit(__IXGB_DOWN, &adapter->flags))) {
1896 netif_wake_queue(netdev);
1897 ++adapter->restart_queue;
1898 }
1899 }
1900
1901 if (adapter->detect_tx_hung) {
1902 /* detect a transmit hang in hardware, this serializes the
1903 * check with the clearing of time_stamp and movement of i */
1904 adapter->detect_tx_hung = false;
1905 if (tx_ring->buffer_info[eop].time_stamp &&
1906 time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ)
1907 && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1908 IXGB_STATUS_TXOFF)) {
1909 /* detected Tx unit hang */
1910 netif_err(adapter, drv, adapter->netdev,
1911 "Detected Tx Unit Hang\n"
1912 " TDH <%x>\n"
1913 " TDT <%x>\n"
1914 " next_to_use <%x>\n"
1915 " next_to_clean <%x>\n"
1916 "buffer_info[next_to_clean]\n"
1917 " time_stamp <%lx>\n"
1918 " next_to_watch <%x>\n"
1919 " jiffies <%lx>\n"
1920 " next_to_watch.status <%x>\n",
1921 IXGB_READ_REG(&adapter->hw, TDH),
1922 IXGB_READ_REG(&adapter->hw, TDT),
1923 tx_ring->next_to_use,
1924 tx_ring->next_to_clean,
1925 tx_ring->buffer_info[eop].time_stamp,
1926 eop,
1927 jiffies,
1928 eop_desc->status);
1929 netif_stop_queue(netdev);
1930 }
1931 }
1932
1933 return cleaned;
1934 }
1935
1936 /**
1937 * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1938 * @adapter: board private structure
1939 * @rx_desc: receive descriptor
1940 * @sk_buff: socket buffer with received data
1941 **/
1942
1943 static void
1944 ixgb_rx_checksum(struct ixgb_adapter *adapter,
1945 struct ixgb_rx_desc *rx_desc,
1946 struct sk_buff *skb)
1947 {
1948 /* Ignore Checksum bit is set OR
1949 * TCP Checksum has not been calculated
1950 */
1951 if ((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1952 (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1953 skb_checksum_none_assert(skb);
1954 return;
1955 }
1956
1957 /* At this point we know the hardware did the TCP checksum */
1958 /* now look at the TCP checksum error bit */
1959 if (rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1960 /* let the stack verify checksum errors */
1961 skb_checksum_none_assert(skb);
1962 adapter->hw_csum_rx_error++;
1963 } else {
1964 /* TCP checksum is good */
1965 skb->ip_summed = CHECKSUM_UNNECESSARY;
1966 adapter->hw_csum_rx_good++;
1967 }
1968 }
1969
1970 /*
1971 * this should improve performance for small packets with large amounts
1972 * of reassembly being done in the stack
1973 */
1974 static void ixgb_check_copybreak(struct net_device *netdev,
1975 struct ixgb_buffer *buffer_info,
1976 u32 length, struct sk_buff **skb)
1977 {
1978 struct sk_buff *new_skb;
1979
1980 if (length > copybreak)
1981 return;
1982
1983 new_skb = netdev_alloc_skb_ip_align(netdev, length);
1984 if (!new_skb)
1985 return;
1986
1987 skb_copy_to_linear_data_offset(new_skb, -NET_IP_ALIGN,
1988 (*skb)->data - NET_IP_ALIGN,
1989 length + NET_IP_ALIGN);
1990 /* save the skb in buffer_info as good */
1991 buffer_info->skb = *skb;
1992 *skb = new_skb;
1993 }
1994
1995 /**
1996 * ixgb_clean_rx_irq - Send received data up the network stack,
1997 * @adapter: board private structure
1998 **/
1999
2000 static bool
2001 ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
2002 {
2003 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2004 struct net_device *netdev = adapter->netdev;
2005 struct pci_dev *pdev = adapter->pdev;
2006 struct ixgb_rx_desc *rx_desc, *next_rxd;
2007 struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
2008 u32 length;
2009 unsigned int i, j;
2010 int cleaned_count = 0;
2011 bool cleaned = false;
2012
2013 i = rx_ring->next_to_clean;
2014 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2015 buffer_info = &rx_ring->buffer_info[i];
2016
2017 while (rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
2018 struct sk_buff *skb;
2019 u8 status;
2020
2021 if (*work_done >= work_to_do)
2022 break;
2023
2024 (*work_done)++;
2025 rmb(); /* read descriptor and rx_buffer_info after status DD */
2026 status = rx_desc->status;
2027 skb = buffer_info->skb;
2028 buffer_info->skb = NULL;
2029
2030 prefetch(skb->data - NET_IP_ALIGN);
2031
2032 if (++i == rx_ring->count)
2033 i = 0;
2034 next_rxd = IXGB_RX_DESC(*rx_ring, i);
2035 prefetch(next_rxd);
2036
2037 j = i + 1;
2038 if (j == rx_ring->count)
2039 j = 0;
2040 next2_buffer = &rx_ring->buffer_info[j];
2041 prefetch(next2_buffer);
2042
2043 next_buffer = &rx_ring->buffer_info[i];
2044
2045 cleaned = true;
2046 cleaned_count++;
2047
2048 dma_unmap_single(&pdev->dev,
2049 buffer_info->dma,
2050 buffer_info->length,
2051 DMA_FROM_DEVICE);
2052 buffer_info->dma = 0;
2053
2054 length = le16_to_cpu(rx_desc->length);
2055 rx_desc->length = 0;
2056
2057 if (unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
2058
2059 /* All receives must fit into a single buffer */
2060
2061 pr_debug("Receive packet consumed multiple buffers length<%x>\n",
2062 length);
2063
2064 dev_kfree_skb_irq(skb);
2065 goto rxdesc_done;
2066 }
2067
2068 if (unlikely(rx_desc->errors &
2069 (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE |
2070 IXGB_RX_DESC_ERRORS_P | IXGB_RX_DESC_ERRORS_RXE))) {
2071 dev_kfree_skb_irq(skb);
2072 goto rxdesc_done;
2073 }
2074
2075 ixgb_check_copybreak(netdev, buffer_info, length, &skb);
2076
2077 /* Good Receive */
2078 skb_put(skb, length);
2079
2080 /* Receive Checksum Offload */
2081 ixgb_rx_checksum(adapter, rx_desc, skb);
2082
2083 skb->protocol = eth_type_trans(skb, netdev);
2084 if (status & IXGB_RX_DESC_STATUS_VP)
2085 __vlan_hwaccel_put_tag(skb,
2086 le16_to_cpu(rx_desc->special));
2087
2088 netif_receive_skb(skb);
2089
2090 rxdesc_done:
2091 /* clean up descriptor, might be written over by hw */
2092 rx_desc->status = 0;
2093
2094 /* return some buffers to hardware, one at a time is too slow */
2095 if (unlikely(cleaned_count >= IXGB_RX_BUFFER_WRITE)) {
2096 ixgb_alloc_rx_buffers(adapter, cleaned_count);
2097 cleaned_count = 0;
2098 }
2099
2100 /* use prefetched values */
2101 rx_desc = next_rxd;
2102 buffer_info = next_buffer;
2103 }
2104
2105 rx_ring->next_to_clean = i;
2106
2107 cleaned_count = IXGB_DESC_UNUSED(rx_ring);
2108 if (cleaned_count)
2109 ixgb_alloc_rx_buffers(adapter, cleaned_count);
2110
2111 return cleaned;
2112 }
2113
2114 /**
2115 * ixgb_alloc_rx_buffers - Replace used receive buffers
2116 * @adapter: address of board private structure
2117 **/
2118
2119 static void
2120 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter, int cleaned_count)
2121 {
2122 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2123 struct net_device *netdev = adapter->netdev;
2124 struct pci_dev *pdev = adapter->pdev;
2125 struct ixgb_rx_desc *rx_desc;
2126 struct ixgb_buffer *buffer_info;
2127 struct sk_buff *skb;
2128 unsigned int i;
2129 long cleancount;
2130
2131 i = rx_ring->next_to_use;
2132 buffer_info = &rx_ring->buffer_info[i];
2133 cleancount = IXGB_DESC_UNUSED(rx_ring);
2134
2135
2136 /* leave three descriptors unused */
2137 while (--cleancount > 2 && cleaned_count--) {
2138 /* recycle! its good for you */
2139 skb = buffer_info->skb;
2140 if (skb) {
2141 skb_trim(skb, 0);
2142 goto map_skb;
2143 }
2144
2145 skb = netdev_alloc_skb_ip_align(netdev, adapter->rx_buffer_len);
2146 if (unlikely(!skb)) {
2147 /* Better luck next round */
2148 adapter->alloc_rx_buff_failed++;
2149 break;
2150 }
2151
2152 buffer_info->skb = skb;
2153 buffer_info->length = adapter->rx_buffer_len;
2154 map_skb:
2155 buffer_info->dma = dma_map_single(&pdev->dev,
2156 skb->data,
2157 adapter->rx_buffer_len,
2158 DMA_FROM_DEVICE);
2159 if (dma_mapping_error(&pdev->dev, buffer_info->dma)) {
2160 adapter->alloc_rx_buff_failed++;
2161 break;
2162 }
2163
2164 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2165 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
2166 /* guarantee DD bit not set now before h/w gets descriptor
2167 * this is the rest of the workaround for h/w double
2168 * writeback. */
2169 rx_desc->status = 0;
2170
2171
2172 if (++i == rx_ring->count)
2173 i = 0;
2174 buffer_info = &rx_ring->buffer_info[i];
2175 }
2176
2177 if (likely(rx_ring->next_to_use != i)) {
2178 rx_ring->next_to_use = i;
2179 if (unlikely(i-- == 0))
2180 i = (rx_ring->count - 1);
2181
2182 /* Force memory writes to complete before letting h/w
2183 * know there are new descriptors to fetch. (Only
2184 * applicable for weak-ordered memory model archs, such
2185 * as IA-64). */
2186 wmb();
2187 IXGB_WRITE_REG(&adapter->hw, RDT, i);
2188 }
2189 }
2190
2191 static void
2192 ixgb_vlan_strip_enable(struct ixgb_adapter *adapter)
2193 {
2194 u32 ctrl;
2195
2196 /* enable VLAN tag insert/strip */
2197 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2198 ctrl |= IXGB_CTRL0_VME;
2199 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2200 }
2201
2202 static void
2203 ixgb_vlan_strip_disable(struct ixgb_adapter *adapter)
2204 {
2205 u32 ctrl;
2206
2207 /* disable VLAN tag insert/strip */
2208 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2209 ctrl &= ~IXGB_CTRL0_VME;
2210 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2211 }
2212
2213 static int
2214 ixgb_vlan_rx_add_vid(struct net_device *netdev, __be16 proto, u16 vid)
2215 {
2216 struct ixgb_adapter *adapter = netdev_priv(netdev);
2217 u32 vfta, index;
2218
2219 /* add VID to filter table */
2220
2221 index = (vid >> 5) & 0x7F;
2222 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2223 vfta |= (1 << (vid & 0x1F));
2224 ixgb_write_vfta(&adapter->hw, index, vfta);
2225 set_bit(vid, adapter->active_vlans);
2226
2227 return 0;
2228 }
2229
2230 static int
2231 ixgb_vlan_rx_kill_vid(struct net_device *netdev, __be16 proto, u16 vid)
2232 {
2233 struct ixgb_adapter *adapter = netdev_priv(netdev);
2234 u32 vfta, index;
2235
2236 /* remove VID from filter table */
2237
2238 index = (vid >> 5) & 0x7F;
2239 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2240 vfta &= ~(1 << (vid & 0x1F));
2241 ixgb_write_vfta(&adapter->hw, index, vfta);
2242 clear_bit(vid, adapter->active_vlans);
2243
2244 return 0;
2245 }
2246
2247 static void
2248 ixgb_restore_vlan(struct ixgb_adapter *adapter)
2249 {
2250 u16 vid;
2251
2252 for_each_set_bit(vid, adapter->active_vlans, VLAN_N_VID)
2253 ixgb_vlan_rx_add_vid(adapter->netdev, htons(ETH_P_8021Q), vid);
2254 }
2255
2256 #ifdef CONFIG_NET_POLL_CONTROLLER
2257 /*
2258 * Polling 'interrupt' - used by things like netconsole to send skbs
2259 * without having to re-enable interrupts. It's not called while
2260 * the interrupt routine is executing.
2261 */
2262
2263 static void ixgb_netpoll(struct net_device *dev)
2264 {
2265 struct ixgb_adapter *adapter = netdev_priv(dev);
2266
2267 disable_irq(adapter->pdev->irq);
2268 ixgb_intr(adapter->pdev->irq, dev);
2269 enable_irq(adapter->pdev->irq);
2270 }
2271 #endif
2272
2273 /**
2274 * ixgb_io_error_detected - called when PCI error is detected
2275 * @pdev: pointer to pci device with error
2276 * @state: pci channel state after error
2277 *
2278 * This callback is called by the PCI subsystem whenever
2279 * a PCI bus error is detected.
2280 */
2281 static pci_ers_result_t ixgb_io_error_detected(struct pci_dev *pdev,
2282 enum pci_channel_state state)
2283 {
2284 struct net_device *netdev = pci_get_drvdata(pdev);
2285 struct ixgb_adapter *adapter = netdev_priv(netdev);
2286
2287 netif_device_detach(netdev);
2288
2289 if (state == pci_channel_io_perm_failure)
2290 return PCI_ERS_RESULT_DISCONNECT;
2291
2292 if (netif_running(netdev))
2293 ixgb_down(adapter, true);
2294
2295 pci_disable_device(pdev);
2296
2297 /* Request a slot reset. */
2298 return PCI_ERS_RESULT_NEED_RESET;
2299 }
2300
2301 /**
2302 * ixgb_io_slot_reset - called after the pci bus has been reset.
2303 * @pdev pointer to pci device with error
2304 *
2305 * This callback is called after the PCI bus has been reset.
2306 * Basically, this tries to restart the card from scratch.
2307 * This is a shortened version of the device probe/discovery code,
2308 * it resembles the first-half of the ixgb_probe() routine.
2309 */
2310 static pci_ers_result_t ixgb_io_slot_reset(struct pci_dev *pdev)
2311 {
2312 struct net_device *netdev = pci_get_drvdata(pdev);
2313 struct ixgb_adapter *adapter = netdev_priv(netdev);
2314
2315 if (pci_enable_device(pdev)) {
2316 netif_err(adapter, probe, adapter->netdev,
2317 "Cannot re-enable PCI device after reset\n");
2318 return PCI_ERS_RESULT_DISCONNECT;
2319 }
2320
2321 /* Perform card reset only on one instance of the card */
2322 if (0 != PCI_FUNC (pdev->devfn))
2323 return PCI_ERS_RESULT_RECOVERED;
2324
2325 pci_set_master(pdev);
2326
2327 netif_carrier_off(netdev);
2328 netif_stop_queue(netdev);
2329 ixgb_reset(adapter);
2330
2331 /* Make sure the EEPROM is good */
2332 if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
2333 netif_err(adapter, probe, adapter->netdev,
2334 "After reset, the EEPROM checksum is not valid\n");
2335 return PCI_ERS_RESULT_DISCONNECT;
2336 }
2337 ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
2338 memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
2339
2340 if (!is_valid_ether_addr(netdev->perm_addr)) {
2341 netif_err(adapter, probe, adapter->netdev,
2342 "After reset, invalid MAC address\n");
2343 return PCI_ERS_RESULT_DISCONNECT;
2344 }
2345
2346 return PCI_ERS_RESULT_RECOVERED;
2347 }
2348
2349 /**
2350 * ixgb_io_resume - called when its OK to resume normal operations
2351 * @pdev pointer to pci device with error
2352 *
2353 * The error recovery driver tells us that its OK to resume
2354 * normal operation. Implementation resembles the second-half
2355 * of the ixgb_probe() routine.
2356 */
2357 static void ixgb_io_resume(struct pci_dev *pdev)
2358 {
2359 struct net_device *netdev = pci_get_drvdata(pdev);
2360 struct ixgb_adapter *adapter = netdev_priv(netdev);
2361
2362 pci_set_master(pdev);
2363
2364 if (netif_running(netdev)) {
2365 if (ixgb_up(adapter)) {
2366 pr_err("can't bring device back up after reset\n");
2367 return;
2368 }
2369 }
2370
2371 netif_device_attach(netdev);
2372 mod_timer(&adapter->watchdog_timer, jiffies);
2373 }
2374
2375 /* ixgb_main.c */
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