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