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1// SPDX-License-Identifier: GPL-2.0
2/* Copyright(c) 1999 - 2008 Intel Corporation. */
3
4#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
5
6#include <linux/prefetch.h>
7#include "ixgb.h"
8
9char ixgb_driver_name[] = "ixgb";
10static char ixgb_driver_string[] = "Intel(R) PRO/10GbE Network Driver";
11
12static const char ixgb_copyright[] = "Copyright (c) 1999-2008 Intel Corporation.";
13
14#define IXGB_CB_LENGTH 256
15static unsigned int copybreak __read_mostly = IXGB_CB_LENGTH;
16module_param(copybreak, uint, 0644);
17MODULE_PARM_DESC(copybreak,
18 "Maximum size of packet that is copied to a new buffer on receive");
19
20/* ixgb_pci_tbl - PCI Device ID Table
21 *
22 * Wildcard entries (PCI_ANY_ID) should come last
23 * Last entry must be all 0s
24 *
25 * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
26 * Class, Class Mask, private data (not used) }
27 */
28static const struct pci_device_id ixgb_pci_tbl[] = {
29 {PCI_VENDOR_ID_INTEL, IXGB_DEVICE_ID_82597EX,
30 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
31 {PCI_VENDOR_ID_INTEL, IXGB_DEVICE_ID_82597EX_CX4,
32 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
33 {PCI_VENDOR_ID_INTEL, IXGB_DEVICE_ID_82597EX_SR,
34 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
35 {PCI_VENDOR_ID_INTEL, IXGB_DEVICE_ID_82597EX_LR,
36 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
37
38 /* required last entry */
39 {0,}
40};
41
42MODULE_DEVICE_TABLE(pci, ixgb_pci_tbl);
43
44/* Local Function Prototypes */
45static int ixgb_init_module(void);
46static void ixgb_exit_module(void);
47static int ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
48static void ixgb_remove(struct pci_dev *pdev);
49static int ixgb_sw_init(struct ixgb_adapter *adapter);
50static int ixgb_open(struct net_device *netdev);
51static int ixgb_close(struct net_device *netdev);
52static void ixgb_configure_tx(struct ixgb_adapter *adapter);
53static void ixgb_configure_rx(struct ixgb_adapter *adapter);
54static void ixgb_setup_rctl(struct ixgb_adapter *adapter);
55static void ixgb_clean_tx_ring(struct ixgb_adapter *adapter);
56static void ixgb_clean_rx_ring(struct ixgb_adapter *adapter);
57static void ixgb_set_multi(struct net_device *netdev);
58static void ixgb_watchdog(struct timer_list *t);
59static netdev_tx_t ixgb_xmit_frame(struct sk_buff *skb,
60 struct net_device *netdev);
61static int ixgb_change_mtu(struct net_device *netdev, int new_mtu);
62static int ixgb_set_mac(struct net_device *netdev, void *p);
63static irqreturn_t ixgb_intr(int irq, void *data);
64static bool ixgb_clean_tx_irq(struct ixgb_adapter *adapter);
65
66static int ixgb_clean(struct napi_struct *, int);
67static bool ixgb_clean_rx_irq(struct ixgb_adapter *, int *, int);
68static void ixgb_alloc_rx_buffers(struct ixgb_adapter *, int);
69
70static void ixgb_tx_timeout(struct net_device *dev, unsigned int txqueue);
71static void ixgb_tx_timeout_task(struct work_struct *work);
72
73static void ixgb_vlan_strip_enable(struct ixgb_adapter *adapter);
74static void ixgb_vlan_strip_disable(struct ixgb_adapter *adapter);
75static int ixgb_vlan_rx_add_vid(struct net_device *netdev,
76 __be16 proto, u16 vid);
77static int ixgb_vlan_rx_kill_vid(struct net_device *netdev,
78 __be16 proto, u16 vid);
79static void ixgb_restore_vlan(struct ixgb_adapter *adapter);
80
81static pci_ers_result_t ixgb_io_error_detected (struct pci_dev *pdev,
82 pci_channel_state_t state);
83static pci_ers_result_t ixgb_io_slot_reset (struct pci_dev *pdev);
84static void ixgb_io_resume (struct pci_dev *pdev);
85
86static const struct pci_error_handlers ixgb_err_handler = {
87 .error_detected = ixgb_io_error_detected,
88 .slot_reset = ixgb_io_slot_reset,
89 .resume = ixgb_io_resume,
90};
91
92static struct pci_driver ixgb_driver = {
93 .name = ixgb_driver_name,
94 .id_table = ixgb_pci_tbl,
95 .probe = ixgb_probe,
96 .remove = ixgb_remove,
97 .err_handler = &ixgb_err_handler
98};
99
100MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
101MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver");
102MODULE_LICENSE("GPL v2");
103
104#define DEFAULT_MSG_ENABLE (NETIF_MSG_DRV|NETIF_MSG_PROBE|NETIF_MSG_LINK)
105static int debug = -1;
106module_param(debug, int, 0);
107MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
108
109/**
110 * ixgb_init_module - Driver Registration Routine
111 *
112 * ixgb_init_module is the first routine called when the driver is
113 * loaded. All it does is register with the PCI subsystem.
114 **/
115
116static int __init
117ixgb_init_module(void)
118{
119 pr_info("%s\n", ixgb_driver_string);
120 pr_info("%s\n", ixgb_copyright);
121
122 return pci_register_driver(&ixgb_driver);
123}
124
125module_init(ixgb_init_module);
126
127/**
128 * ixgb_exit_module - Driver Exit Cleanup Routine
129 *
130 * ixgb_exit_module is called just before the driver is removed
131 * from memory.
132 **/
133
134static void __exit
135ixgb_exit_module(void)
136{
137 pci_unregister_driver(&ixgb_driver);
138}
139
140module_exit(ixgb_exit_module);
141
142/**
143 * ixgb_irq_disable - Mask off interrupt generation on the NIC
144 * @adapter: board private structure
145 **/
146
147static void
148ixgb_irq_disable(struct ixgb_adapter *adapter)
149{
150 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
151 IXGB_WRITE_FLUSH(&adapter->hw);
152 synchronize_irq(adapter->pdev->irq);
153}
154
155/**
156 * ixgb_irq_enable - Enable default interrupt generation settings
157 * @adapter: board private structure
158 **/
159
160static void
161ixgb_irq_enable(struct ixgb_adapter *adapter)
162{
163 u32 val = IXGB_INT_RXT0 | IXGB_INT_RXDMT0 |
164 IXGB_INT_TXDW | IXGB_INT_LSC;
165 if (adapter->hw.subsystem_vendor_id == PCI_VENDOR_ID_SUN)
166 val |= IXGB_INT_GPI0;
167 IXGB_WRITE_REG(&adapter->hw, IMS, val);
168 IXGB_WRITE_FLUSH(&adapter->hw);
169}
170
171int
172ixgb_up(struct ixgb_adapter *adapter)
173{
174 struct net_device *netdev = adapter->netdev;
175 int err, irq_flags = IRQF_SHARED;
176 int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
177 struct ixgb_hw *hw = &adapter->hw;
178
179 /* hardware has been reset, we need to reload some things */
180
181 ixgb_rar_set(hw, netdev->dev_addr, 0);
182 ixgb_set_multi(netdev);
183
184 ixgb_restore_vlan(adapter);
185
186 ixgb_configure_tx(adapter);
187 ixgb_setup_rctl(adapter);
188 ixgb_configure_rx(adapter);
189 ixgb_alloc_rx_buffers(adapter, IXGB_DESC_UNUSED(&adapter->rx_ring));
190
191 /* disable interrupts and get the hardware into a known state */
192 IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);
193
194 /* only enable MSI if bus is in PCI-X mode */
195 if (IXGB_READ_REG(&adapter->hw, STATUS) & IXGB_STATUS_PCIX_MODE) {
196 err = pci_enable_msi(adapter->pdev);
197 if (!err) {
198 adapter->have_msi = true;
199 irq_flags = 0;
200 }
201 /* proceed to try to request regular interrupt */
202 }
203
204 err = request_irq(adapter->pdev->irq, ixgb_intr, irq_flags,
205 netdev->name, netdev);
206 if (err) {
207 if (adapter->have_msi)
208 pci_disable_msi(adapter->pdev);
209 netif_err(adapter, probe, adapter->netdev,
210 "Unable to allocate interrupt Error: %d\n", err);
211 return err;
212 }
213
214 if ((hw->max_frame_size != max_frame) ||
215 (hw->max_frame_size !=
216 (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {
217
218 hw->max_frame_size = max_frame;
219
220 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
221
222 if (hw->max_frame_size >
223 IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
224 u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
225
226 if (!(ctrl0 & IXGB_CTRL0_JFE)) {
227 ctrl0 |= IXGB_CTRL0_JFE;
228 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
229 }
230 }
231 }
232
233 clear_bit(__IXGB_DOWN, &adapter->flags);
234
235 napi_enable(&adapter->napi);
236 ixgb_irq_enable(adapter);
237
238 netif_wake_queue(netdev);
239
240 mod_timer(&adapter->watchdog_timer, jiffies);
241
242 return 0;
243}
244
245void
246ixgb_down(struct ixgb_adapter *adapter, bool kill_watchdog)
247{
248 struct net_device *netdev = adapter->netdev;
249
250 /* prevent the interrupt handler from restarting watchdog */
251 set_bit(__IXGB_DOWN, &adapter->flags);
252
253 netif_carrier_off(netdev);
254
255 napi_disable(&adapter->napi);
256 /* waiting for NAPI to complete can re-enable interrupts */
257 ixgb_irq_disable(adapter);
258 free_irq(adapter->pdev->irq, netdev);
259
260 if (adapter->have_msi)
261 pci_disable_msi(adapter->pdev);
262
263 if (kill_watchdog)
264 del_timer_sync(&adapter->watchdog_timer);
265
266 adapter->link_speed = 0;
267 adapter->link_duplex = 0;
268 netif_stop_queue(netdev);
269
270 ixgb_reset(adapter);
271 ixgb_clean_tx_ring(adapter);
272 ixgb_clean_rx_ring(adapter);
273}
274
275void
276ixgb_reset(struct ixgb_adapter *adapter)
277{
278 struct ixgb_hw *hw = &adapter->hw;
279
280 ixgb_adapter_stop(hw);
281 if (!ixgb_init_hw(hw))
282 netif_err(adapter, probe, adapter->netdev, "ixgb_init_hw failed\n");
283
284 /* restore frame size information */
285 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
286 if (hw->max_frame_size >
287 IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
288 u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
289 if (!(ctrl0 & IXGB_CTRL0_JFE)) {
290 ctrl0 |= IXGB_CTRL0_JFE;
291 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
292 }
293 }
294}
295
296static netdev_features_t
297ixgb_fix_features(struct net_device *netdev, netdev_features_t features)
298{
299 /*
300 * Tx VLAN insertion does not work per HW design when Rx stripping is
301 * disabled.
302 */
303 if (!(features & NETIF_F_HW_VLAN_CTAG_RX))
304 features &= ~NETIF_F_HW_VLAN_CTAG_TX;
305
306 return features;
307}
308
309static int
310ixgb_set_features(struct net_device *netdev, netdev_features_t features)
311{
312 struct ixgb_adapter *adapter = netdev_priv(netdev);
313 netdev_features_t changed = features ^ netdev->features;
314
315 if (!(changed & (NETIF_F_RXCSUM|NETIF_F_HW_VLAN_CTAG_RX)))
316 return 0;
317
318 adapter->rx_csum = !!(features & NETIF_F_RXCSUM);
319
320 if (netif_running(netdev)) {
321 ixgb_down(adapter, true);
322 ixgb_up(adapter);
323 ixgb_set_speed_duplex(netdev);
324 } else
325 ixgb_reset(adapter);
326
327 return 0;
328}
329
330
331static const struct net_device_ops ixgb_netdev_ops = {
332 .ndo_open = ixgb_open,
333 .ndo_stop = ixgb_close,
334 .ndo_start_xmit = ixgb_xmit_frame,
335 .ndo_set_rx_mode = ixgb_set_multi,
336 .ndo_validate_addr = eth_validate_addr,
337 .ndo_set_mac_address = ixgb_set_mac,
338 .ndo_change_mtu = ixgb_change_mtu,
339 .ndo_tx_timeout = ixgb_tx_timeout,
340 .ndo_vlan_rx_add_vid = ixgb_vlan_rx_add_vid,
341 .ndo_vlan_rx_kill_vid = ixgb_vlan_rx_kill_vid,
342 .ndo_fix_features = ixgb_fix_features,
343 .ndo_set_features = ixgb_set_features,
344};
345
346/**
347 * ixgb_probe - Device Initialization Routine
348 * @pdev: PCI device information struct
349 * @ent: entry in ixgb_pci_tbl
350 *
351 * Returns 0 on success, negative on failure
352 *
353 * ixgb_probe initializes an adapter identified by a pci_dev structure.
354 * The OS initialization, configuring of the adapter private structure,
355 * and a hardware reset occur.
356 **/
357
358static int
359ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
360{
361 struct net_device *netdev = NULL;
362 struct ixgb_adapter *adapter;
363 static int cards_found = 0;
364 int pci_using_dac;
365 int i;
366 int err;
367
368 err = pci_enable_device(pdev);
369 if (err)
370 return err;
371
372 pci_using_dac = 0;
373 err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
374 if (!err) {
375 pci_using_dac = 1;
376 } else {
377 err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
378 if (err) {
379 pr_err("No usable DMA configuration, aborting\n");
380 goto err_dma_mask;
381 }
382 }
383
384 err = pci_request_regions(pdev, ixgb_driver_name);
385 if (err)
386 goto err_request_regions;
387
388 pci_set_master(pdev);
389
390 netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
391 if (!netdev) {
392 err = -ENOMEM;
393 goto err_alloc_etherdev;
394 }
395
396 SET_NETDEV_DEV(netdev, &pdev->dev);
397
398 pci_set_drvdata(pdev, netdev);
399 adapter = netdev_priv(netdev);
400 adapter->netdev = netdev;
401 adapter->pdev = pdev;
402 adapter->hw.back = adapter;
403 adapter->msg_enable = netif_msg_init(debug, DEFAULT_MSG_ENABLE);
404
405 adapter->hw.hw_addr = pci_ioremap_bar(pdev, BAR_0);
406 if (!adapter->hw.hw_addr) {
407 err = -EIO;
408 goto err_ioremap;
409 }
410
411 for (i = BAR_1; i < PCI_STD_NUM_BARS; i++) {
412 if (pci_resource_len(pdev, i) == 0)
413 continue;
414 if (pci_resource_flags(pdev, i) & IORESOURCE_IO) {
415 adapter->hw.io_base = pci_resource_start(pdev, i);
416 break;
417 }
418 }
419
420 netdev->netdev_ops = &ixgb_netdev_ops;
421 ixgb_set_ethtool_ops(netdev);
422 netdev->watchdog_timeo = 5 * HZ;
423 netif_napi_add(netdev, &adapter->napi, ixgb_clean, 64);
424
425 strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
426
427 adapter->bd_number = cards_found;
428 adapter->link_speed = 0;
429 adapter->link_duplex = 0;
430
431 /* setup the private structure */
432
433 err = ixgb_sw_init(adapter);
434 if (err)
435 goto err_sw_init;
436
437 netdev->hw_features = NETIF_F_SG |
438 NETIF_F_TSO |
439 NETIF_F_HW_CSUM |
440 NETIF_F_HW_VLAN_CTAG_TX |
441 NETIF_F_HW_VLAN_CTAG_RX;
442 netdev->features = netdev->hw_features |
443 NETIF_F_HW_VLAN_CTAG_FILTER;
444 netdev->hw_features |= NETIF_F_RXCSUM;
445
446 if (pci_using_dac) {
447 netdev->features |= NETIF_F_HIGHDMA;
448 netdev->vlan_features |= NETIF_F_HIGHDMA;
449 }
450
451 /* MTU range: 68 - 16114 */
452 netdev->min_mtu = ETH_MIN_MTU;
453 netdev->max_mtu = IXGB_MAX_JUMBO_FRAME_SIZE - ETH_HLEN;
454
455 /* make sure the EEPROM is good */
456
457 if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
458 netif_err(adapter, probe, adapter->netdev,
459 "The EEPROM Checksum Is Not Valid\n");
460 err = -EIO;
461 goto err_eeprom;
462 }
463
464 ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
465
466 if (!is_valid_ether_addr(netdev->dev_addr)) {
467 netif_err(adapter, probe, adapter->netdev, "Invalid MAC Address\n");
468 err = -EIO;
469 goto err_eeprom;
470 }
471
472 adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
473
474 timer_setup(&adapter->watchdog_timer, ixgb_watchdog, 0);
475
476 INIT_WORK(&adapter->tx_timeout_task, ixgb_tx_timeout_task);
477
478 strcpy(netdev->name, "eth%d");
479 err = register_netdev(netdev);
480 if (err)
481 goto err_register;
482
483 /* carrier off reporting is important to ethtool even BEFORE open */
484 netif_carrier_off(netdev);
485
486 netif_info(adapter, probe, adapter->netdev,
487 "Intel(R) PRO/10GbE Network Connection\n");
488 ixgb_check_options(adapter);
489 /* reset the hardware with the new settings */
490
491 ixgb_reset(adapter);
492
493 cards_found++;
494 return 0;
495
496err_register:
497err_sw_init:
498err_eeprom:
499 iounmap(adapter->hw.hw_addr);
500err_ioremap:
501 free_netdev(netdev);
502err_alloc_etherdev:
503 pci_release_regions(pdev);
504err_request_regions:
505err_dma_mask:
506 pci_disable_device(pdev);
507 return err;
508}
509
510/**
511 * ixgb_remove - Device Removal Routine
512 * @pdev: PCI device information struct
513 *
514 * ixgb_remove is called by the PCI subsystem to alert the driver
515 * that it should release a PCI device. The could be caused by a
516 * Hot-Plug event, or because the driver is going to be removed from
517 * memory.
518 **/
519
520static void
521ixgb_remove(struct pci_dev *pdev)
522{
523 struct net_device *netdev = pci_get_drvdata(pdev);
524 struct ixgb_adapter *adapter = netdev_priv(netdev);
525
526 cancel_work_sync(&adapter->tx_timeout_task);
527
528 unregister_netdev(netdev);
529
530 iounmap(adapter->hw.hw_addr);
531 pci_release_regions(pdev);
532
533 free_netdev(netdev);
534 pci_disable_device(pdev);
535}
536
537/**
538 * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
539 * @adapter: board private structure to initialize
540 *
541 * ixgb_sw_init initializes the Adapter private data structure.
542 * Fields are initialized based on PCI device information and
543 * OS network device settings (MTU size).
544 **/
545
546static int
547ixgb_sw_init(struct ixgb_adapter *adapter)
548{
549 struct ixgb_hw *hw = &adapter->hw;
550 struct net_device *netdev = adapter->netdev;
551 struct pci_dev *pdev = adapter->pdev;
552
553 /* PCI config space info */
554
555 hw->vendor_id = pdev->vendor;
556 hw->device_id = pdev->device;
557 hw->subsystem_vendor_id = pdev->subsystem_vendor;
558 hw->subsystem_id = pdev->subsystem_device;
559
560 hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
561 adapter->rx_buffer_len = hw->max_frame_size + 8; /* + 8 for errata */
562
563 if ((hw->device_id == IXGB_DEVICE_ID_82597EX) ||
564 (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4) ||
565 (hw->device_id == IXGB_DEVICE_ID_82597EX_LR) ||
566 (hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
567 hw->mac_type = ixgb_82597;
568 else {
569 /* should never have loaded on this device */
570 netif_err(adapter, probe, adapter->netdev, "unsupported device id\n");
571 }
572
573 /* enable flow control to be programmed */
574 hw->fc.send_xon = 1;
575
576 set_bit(__IXGB_DOWN, &adapter->flags);
577 return 0;
578}
579
580/**
581 * ixgb_open - Called when a network interface is made active
582 * @netdev: network interface device structure
583 *
584 * Returns 0 on success, negative value on failure
585 *
586 * The open entry point is called when a network interface is made
587 * active by the system (IFF_UP). At this point all resources needed
588 * for transmit and receive operations are allocated, the interrupt
589 * handler is registered with the OS, the watchdog timer is started,
590 * and the stack is notified that the interface is ready.
591 **/
592
593static int
594ixgb_open(struct net_device *netdev)
595{
596 struct ixgb_adapter *adapter = netdev_priv(netdev);
597 int err;
598
599 /* allocate transmit descriptors */
600 err = ixgb_setup_tx_resources(adapter);
601 if (err)
602 goto err_setup_tx;
603
604 netif_carrier_off(netdev);
605
606 /* allocate receive descriptors */
607
608 err = ixgb_setup_rx_resources(adapter);
609 if (err)
610 goto err_setup_rx;
611
612 err = ixgb_up(adapter);
613 if (err)
614 goto err_up;
615
616 netif_start_queue(netdev);
617
618 return 0;
619
620err_up:
621 ixgb_free_rx_resources(adapter);
622err_setup_rx:
623 ixgb_free_tx_resources(adapter);
624err_setup_tx:
625 ixgb_reset(adapter);
626
627 return err;
628}
629
630/**
631 * ixgb_close - Disables a network interface
632 * @netdev: network interface device structure
633 *
634 * Returns 0, this is not allowed to fail
635 *
636 * The close entry point is called when an interface is de-activated
637 * by the OS. The hardware is still under the drivers control, but
638 * needs to be disabled. A global MAC reset is issued to stop the
639 * hardware, and all transmit and receive resources are freed.
640 **/
641
642static int
643ixgb_close(struct net_device *netdev)
644{
645 struct ixgb_adapter *adapter = netdev_priv(netdev);
646
647 ixgb_down(adapter, true);
648
649 ixgb_free_tx_resources(adapter);
650 ixgb_free_rx_resources(adapter);
651
652 return 0;
653}
654
655/**
656 * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
657 * @adapter: board private structure
658 *
659 * Return 0 on success, negative on failure
660 **/
661
662int
663ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
664{
665 struct ixgb_desc_ring *txdr = &adapter->tx_ring;
666 struct pci_dev *pdev = adapter->pdev;
667 int size;
668
669 size = sizeof(struct ixgb_buffer) * txdr->count;
670 txdr->buffer_info = vzalloc(size);
671 if (!txdr->buffer_info)
672 return -ENOMEM;
673
674 /* round up to nearest 4K */
675
676 txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
677 txdr->size = ALIGN(txdr->size, 4096);
678
679 txdr->desc = dma_alloc_coherent(&pdev->dev, txdr->size, &txdr->dma,
680 GFP_KERNEL);
681 if (!txdr->desc) {
682 vfree(txdr->buffer_info);
683 return -ENOMEM;
684 }
685
686 txdr->next_to_use = 0;
687 txdr->next_to_clean = 0;
688
689 return 0;
690}
691
692/**
693 * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
694 * @adapter: board private structure
695 *
696 * Configure the Tx unit of the MAC after a reset.
697 **/
698
699static void
700ixgb_configure_tx(struct ixgb_adapter *adapter)
701{
702 u64 tdba = adapter->tx_ring.dma;
703 u32 tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
704 u32 tctl;
705 struct ixgb_hw *hw = &adapter->hw;
706
707 /* Setup the Base and Length of the Tx Descriptor Ring
708 * tx_ring.dma can be either a 32 or 64 bit value
709 */
710
711 IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
712 IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
713
714 IXGB_WRITE_REG(hw, TDLEN, tdlen);
715
716 /* Setup the HW Tx Head and Tail descriptor pointers */
717
718 IXGB_WRITE_REG(hw, TDH, 0);
719 IXGB_WRITE_REG(hw, TDT, 0);
720
721 /* don't set up txdctl, it induces performance problems if configured
722 * incorrectly */
723 /* Set the Tx Interrupt Delay register */
724
725 IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
726
727 /* Program the Transmit Control Register */
728
729 tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
730 IXGB_WRITE_REG(hw, TCTL, tctl);
731
732 /* Setup Transmit Descriptor Settings for this adapter */
733 adapter->tx_cmd_type =
734 IXGB_TX_DESC_TYPE |
735 (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
736}
737
738/**
739 * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
740 * @adapter: board private structure
741 *
742 * Returns 0 on success, negative on failure
743 **/
744
745int
746ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
747{
748 struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
749 struct pci_dev *pdev = adapter->pdev;
750 int size;
751
752 size = sizeof(struct ixgb_buffer) * rxdr->count;
753 rxdr->buffer_info = vzalloc(size);
754 if (!rxdr->buffer_info)
755 return -ENOMEM;
756
757 /* Round up to nearest 4K */
758
759 rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
760 rxdr->size = ALIGN(rxdr->size, 4096);
761
762 rxdr->desc = dma_alloc_coherent(&pdev->dev, rxdr->size, &rxdr->dma,
763 GFP_KERNEL);
764
765 if (!rxdr->desc) {
766 vfree(rxdr->buffer_info);
767 return -ENOMEM;
768 }
769
770 rxdr->next_to_clean = 0;
771 rxdr->next_to_use = 0;
772
773 return 0;
774}
775
776/**
777 * ixgb_setup_rctl - configure the receive control register
778 * @adapter: Board private structure
779 **/
780
781static void
782ixgb_setup_rctl(struct ixgb_adapter *adapter)
783{
784 u32 rctl;
785
786 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
787
788 rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
789
790 rctl |=
791 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
792 IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
793 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
794
795 rctl |= IXGB_RCTL_SECRC;
796
797 if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048)
798 rctl |= IXGB_RCTL_BSIZE_2048;
799 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096)
800 rctl |= IXGB_RCTL_BSIZE_4096;
801 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192)
802 rctl |= IXGB_RCTL_BSIZE_8192;
803 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384)
804 rctl |= IXGB_RCTL_BSIZE_16384;
805
806 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
807}
808
809/**
810 * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
811 * @adapter: board private structure
812 *
813 * Configure the Rx unit of the MAC after a reset.
814 **/
815
816static void
817ixgb_configure_rx(struct ixgb_adapter *adapter)
818{
819 u64 rdba = adapter->rx_ring.dma;
820 u32 rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
821 struct ixgb_hw *hw = &adapter->hw;
822 u32 rctl;
823 u32 rxcsum;
824
825 /* make sure receives are disabled while setting up the descriptors */
826
827 rctl = IXGB_READ_REG(hw, RCTL);
828 IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
829
830 /* set the Receive Delay Timer Register */
831
832 IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
833
834 /* Setup the Base and Length of the Rx Descriptor Ring */
835
836 IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
837 IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
838
839 IXGB_WRITE_REG(hw, RDLEN, rdlen);
840
841 /* Setup the HW Rx Head and Tail Descriptor Pointers */
842 IXGB_WRITE_REG(hw, RDH, 0);
843 IXGB_WRITE_REG(hw, RDT, 0);
844
845 /* due to the hardware errata with RXDCTL, we are unable to use any of
846 * the performance enhancing features of it without causing other
847 * subtle bugs, some of the bugs could include receive length
848 * corruption at high data rates (WTHRESH > 0) and/or receive
849 * descriptor ring irregularites (particularly in hardware cache) */
850 IXGB_WRITE_REG(hw, RXDCTL, 0);
851
852 /* Enable Receive Checksum Offload for TCP and UDP */
853 if (adapter->rx_csum) {
854 rxcsum = IXGB_READ_REG(hw, RXCSUM);
855 rxcsum |= IXGB_RXCSUM_TUOFL;
856 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
857 }
858
859 /* Enable Receives */
860
861 IXGB_WRITE_REG(hw, RCTL, rctl);
862}
863
864/**
865 * ixgb_free_tx_resources - Free Tx Resources
866 * @adapter: board private structure
867 *
868 * Free all transmit software resources
869 **/
870
871void
872ixgb_free_tx_resources(struct ixgb_adapter *adapter)
873{
874 struct pci_dev *pdev = adapter->pdev;
875
876 ixgb_clean_tx_ring(adapter);
877
878 vfree(adapter->tx_ring.buffer_info);
879 adapter->tx_ring.buffer_info = NULL;
880
881 dma_free_coherent(&pdev->dev, adapter->tx_ring.size,
882 adapter->tx_ring.desc, adapter->tx_ring.dma);
883
884 adapter->tx_ring.desc = NULL;
885}
886
887static void
888ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
889 struct ixgb_buffer *buffer_info)
890{
891 if (buffer_info->dma) {
892 if (buffer_info->mapped_as_page)
893 dma_unmap_page(&adapter->pdev->dev, buffer_info->dma,
894 buffer_info->length, DMA_TO_DEVICE);
895 else
896 dma_unmap_single(&adapter->pdev->dev, buffer_info->dma,
897 buffer_info->length, DMA_TO_DEVICE);
898 buffer_info->dma = 0;
899 }
900
901 if (buffer_info->skb) {
902 dev_kfree_skb_any(buffer_info->skb);
903 buffer_info->skb = NULL;
904 }
905 buffer_info->time_stamp = 0;
906 /* these fields must always be initialized in tx
907 * buffer_info->length = 0;
908 * buffer_info->next_to_watch = 0; */
909}
910
911/**
912 * ixgb_clean_tx_ring - Free Tx Buffers
913 * @adapter: board private structure
914 **/
915
916static void
917ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
918{
919 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
920 struct ixgb_buffer *buffer_info;
921 unsigned long size;
922 unsigned int i;
923
924 /* Free all the Tx ring sk_buffs */
925
926 for (i = 0; i < tx_ring->count; i++) {
927 buffer_info = &tx_ring->buffer_info[i];
928 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
929 }
930
931 size = sizeof(struct ixgb_buffer) * tx_ring->count;
932 memset(tx_ring->buffer_info, 0, size);
933
934 /* Zero out the descriptor ring */
935
936 memset(tx_ring->desc, 0, tx_ring->size);
937
938 tx_ring->next_to_use = 0;
939 tx_ring->next_to_clean = 0;
940
941 IXGB_WRITE_REG(&adapter->hw, TDH, 0);
942 IXGB_WRITE_REG(&adapter->hw, TDT, 0);
943}
944
945/**
946 * ixgb_free_rx_resources - Free Rx Resources
947 * @adapter: board private structure
948 *
949 * Free all receive software resources
950 **/
951
952void
953ixgb_free_rx_resources(struct ixgb_adapter *adapter)
954{
955 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
956 struct pci_dev *pdev = adapter->pdev;
957
958 ixgb_clean_rx_ring(adapter);
959
960 vfree(rx_ring->buffer_info);
961 rx_ring->buffer_info = NULL;
962
963 dma_free_coherent(&pdev->dev, rx_ring->size, rx_ring->desc,
964 rx_ring->dma);
965
966 rx_ring->desc = NULL;
967}
968
969/**
970 * ixgb_clean_rx_ring - Free Rx Buffers
971 * @adapter: board private structure
972 **/
973
974static void
975ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
976{
977 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
978 struct ixgb_buffer *buffer_info;
979 struct pci_dev *pdev = adapter->pdev;
980 unsigned long size;
981 unsigned int i;
982
983 /* Free all the Rx ring sk_buffs */
984
985 for (i = 0; i < rx_ring->count; i++) {
986 buffer_info = &rx_ring->buffer_info[i];
987 if (buffer_info->dma) {
988 dma_unmap_single(&pdev->dev,
989 buffer_info->dma,
990 buffer_info->length,
991 DMA_FROM_DEVICE);
992 buffer_info->dma = 0;
993 buffer_info->length = 0;
994 }
995
996 if (buffer_info->skb) {
997 dev_kfree_skb(buffer_info->skb);
998 buffer_info->skb = NULL;
999 }
1000 }
1001
1002 size = sizeof(struct ixgb_buffer) * rx_ring->count;
1003 memset(rx_ring->buffer_info, 0, size);
1004
1005 /* Zero out the descriptor ring */
1006
1007 memset(rx_ring->desc, 0, rx_ring->size);
1008
1009 rx_ring->next_to_clean = 0;
1010 rx_ring->next_to_use = 0;
1011
1012 IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1013 IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1014}
1015
1016/**
1017 * ixgb_set_mac - Change the Ethernet Address of the NIC
1018 * @netdev: network interface device structure
1019 * @p: pointer to an address structure
1020 *
1021 * Returns 0 on success, negative on failure
1022 **/
1023
1024static int
1025ixgb_set_mac(struct net_device *netdev, void *p)
1026{
1027 struct ixgb_adapter *adapter = netdev_priv(netdev);
1028 struct sockaddr *addr = p;
1029
1030 if (!is_valid_ether_addr(addr->sa_data))
1031 return -EADDRNOTAVAIL;
1032
1033 memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1034
1035 ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1036
1037 return 0;
1038}
1039
1040/**
1041 * ixgb_set_multi - Multicast and Promiscuous mode set
1042 * @netdev: network interface device structure
1043 *
1044 * The set_multi entry point is called whenever the multicast address
1045 * list or the network interface flags are updated. This routine is
1046 * responsible for configuring the hardware for proper multicast,
1047 * promiscuous mode, and all-multi behavior.
1048 **/
1049
1050static void
1051ixgb_set_multi(struct net_device *netdev)
1052{
1053 struct ixgb_adapter *adapter = netdev_priv(netdev);
1054 struct ixgb_hw *hw = &adapter->hw;
1055 struct netdev_hw_addr *ha;
1056 u32 rctl;
1057
1058 /* Check for Promiscuous and All Multicast modes */
1059
1060 rctl = IXGB_READ_REG(hw, RCTL);
1061
1062 if (netdev->flags & IFF_PROMISC) {
1063 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1064 /* disable VLAN filtering */
1065 rctl &= ~IXGB_RCTL_CFIEN;
1066 rctl &= ~IXGB_RCTL_VFE;
1067 } else {
1068 if (netdev->flags & IFF_ALLMULTI) {
1069 rctl |= IXGB_RCTL_MPE;
1070 rctl &= ~IXGB_RCTL_UPE;
1071 } else {
1072 rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1073 }
1074 /* enable VLAN filtering */
1075 rctl |= IXGB_RCTL_VFE;
1076 rctl &= ~IXGB_RCTL_CFIEN;
1077 }
1078
1079 if (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1080 rctl |= IXGB_RCTL_MPE;
1081 IXGB_WRITE_REG(hw, RCTL, rctl);
1082 } else {
1083 u8 *mta = kmalloc_array(ETH_ALEN,
1084 IXGB_MAX_NUM_MULTICAST_ADDRESSES,
1085 GFP_ATOMIC);
1086 u8 *addr;
1087 if (!mta)
1088 goto alloc_failed;
1089
1090 IXGB_WRITE_REG(hw, RCTL, rctl);
1091
1092 addr = mta;
1093 netdev_for_each_mc_addr(ha, netdev) {
1094 memcpy(addr, ha->addr, ETH_ALEN);
1095 addr += ETH_ALEN;
1096 }
1097
1098 ixgb_mc_addr_list_update(hw, mta, netdev_mc_count(netdev), 0);
1099 kfree(mta);
1100 }
1101
1102alloc_failed:
1103 if (netdev->features & NETIF_F_HW_VLAN_CTAG_RX)
1104 ixgb_vlan_strip_enable(adapter);
1105 else
1106 ixgb_vlan_strip_disable(adapter);
1107
1108}
1109
1110/**
1111 * ixgb_watchdog - Timer Call-back
1112 * @t: pointer to timer_list containing our private info pointer
1113 **/
1114
1115static void
1116ixgb_watchdog(struct timer_list *t)
1117{
1118 struct ixgb_adapter *adapter = from_timer(adapter, t, watchdog_timer);
1119 struct net_device *netdev = adapter->netdev;
1120 struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1121
1122 ixgb_check_for_link(&adapter->hw);
1123
1124 if (ixgb_check_for_bad_link(&adapter->hw)) {
1125 /* force the reset path */
1126 netif_stop_queue(netdev);
1127 }
1128
1129 if (adapter->hw.link_up) {
1130 if (!netif_carrier_ok(netdev)) {
1131 netdev_info(netdev,
1132 "NIC Link is Up 10 Gbps Full Duplex, Flow Control: %s\n",
1133 (adapter->hw.fc.type == ixgb_fc_full) ?
1134 "RX/TX" :
1135 (adapter->hw.fc.type == ixgb_fc_rx_pause) ?
1136 "RX" :
1137 (adapter->hw.fc.type == ixgb_fc_tx_pause) ?
1138 "TX" : "None");
1139 adapter->link_speed = 10000;
1140 adapter->link_duplex = FULL_DUPLEX;
1141 netif_carrier_on(netdev);
1142 }
1143 } else {
1144 if (netif_carrier_ok(netdev)) {
1145 adapter->link_speed = 0;
1146 adapter->link_duplex = 0;
1147 netdev_info(netdev, "NIC Link is Down\n");
1148 netif_carrier_off(netdev);
1149 }
1150 }
1151
1152 ixgb_update_stats(adapter);
1153
1154 if (!netif_carrier_ok(netdev)) {
1155 if (IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1156 /* We've lost link, so the controller stops DMA,
1157 * but we've got queued Tx work that's never going
1158 * to get done, so reset controller to flush Tx.
1159 * (Do the reset outside of interrupt context). */
1160 schedule_work(&adapter->tx_timeout_task);
1161 /* return immediately since reset is imminent */
1162 return;
1163 }
1164 }
1165
1166 /* Force detection of hung controller every watchdog period */
1167 adapter->detect_tx_hung = true;
1168
1169 /* generate an interrupt to force clean up of any stragglers */
1170 IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1171
1172 /* Reset the timer */
1173 mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1174}
1175
1176#define IXGB_TX_FLAGS_CSUM 0x00000001
1177#define IXGB_TX_FLAGS_VLAN 0x00000002
1178#define IXGB_TX_FLAGS_TSO 0x00000004
1179
1180static int
1181ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1182{
1183 struct ixgb_context_desc *context_desc;
1184 unsigned int i;
1185 u8 ipcss, ipcso, tucss, tucso, hdr_len;
1186 u16 ipcse, tucse, mss;
1187
1188 if (likely(skb_is_gso(skb))) {
1189 struct ixgb_buffer *buffer_info;
1190 struct iphdr *iph;
1191 int err;
1192
1193 err = skb_cow_head(skb, 0);
1194 if (err < 0)
1195 return err;
1196
1197 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
1198 mss = skb_shinfo(skb)->gso_size;
1199 iph = ip_hdr(skb);
1200 iph->tot_len = 0;
1201 iph->check = 0;
1202 tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
1203 iph->daddr, 0,
1204 IPPROTO_TCP, 0);
1205 ipcss = skb_network_offset(skb);
1206 ipcso = (void *)&(iph->check) - (void *)skb->data;
1207 ipcse = skb_transport_offset(skb) - 1;
1208 tucss = skb_transport_offset(skb);
1209 tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data;
1210 tucse = 0;
1211
1212 i = adapter->tx_ring.next_to_use;
1213 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1214 buffer_info = &adapter->tx_ring.buffer_info[i];
1215 WARN_ON(buffer_info->dma != 0);
1216
1217 context_desc->ipcss = ipcss;
1218 context_desc->ipcso = ipcso;
1219 context_desc->ipcse = cpu_to_le16(ipcse);
1220 context_desc->tucss = tucss;
1221 context_desc->tucso = tucso;
1222 context_desc->tucse = cpu_to_le16(tucse);
1223 context_desc->mss = cpu_to_le16(mss);
1224 context_desc->hdr_len = hdr_len;
1225 context_desc->status = 0;
1226 context_desc->cmd_type_len = cpu_to_le32(
1227 IXGB_CONTEXT_DESC_TYPE
1228 | IXGB_CONTEXT_DESC_CMD_TSE
1229 | IXGB_CONTEXT_DESC_CMD_IP
1230 | IXGB_CONTEXT_DESC_CMD_TCP
1231 | IXGB_CONTEXT_DESC_CMD_IDE
1232 | (skb->len - (hdr_len)));
1233
1234
1235 if (++i == adapter->tx_ring.count) i = 0;
1236 adapter->tx_ring.next_to_use = i;
1237
1238 return 1;
1239 }
1240
1241 return 0;
1242}
1243
1244static bool
1245ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1246{
1247 struct ixgb_context_desc *context_desc;
1248 unsigned int i;
1249 u8 css, cso;
1250
1251 if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
1252 struct ixgb_buffer *buffer_info;
1253 css = skb_checksum_start_offset(skb);
1254 cso = css + skb->csum_offset;
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->tucss = css;
1262 context_desc->tucso = cso;
1263 context_desc->tucse = 0;
1264 /* zero out any previously existing data in one instruction */
1265 *(u32 *)&(context_desc->ipcss) = 0;
1266 context_desc->status = 0;
1267 context_desc->hdr_len = 0;
1268 context_desc->mss = 0;
1269 context_desc->cmd_type_len =
1270 cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1271 | IXGB_TX_DESC_CMD_IDE);
1272
1273 if (++i == adapter->tx_ring.count) i = 0;
1274 adapter->tx_ring.next_to_use = i;
1275
1276 return true;
1277 }
1278
1279 return false;
1280}
1281
1282#define IXGB_MAX_TXD_PWR 14
1283#define IXGB_MAX_DATA_PER_TXD (1<<IXGB_MAX_TXD_PWR)
1284
1285static int
1286ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1287 unsigned int first)
1288{
1289 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1290 struct pci_dev *pdev = adapter->pdev;
1291 struct ixgb_buffer *buffer_info;
1292 int len = skb_headlen(skb);
1293 unsigned int offset = 0, size, count = 0, i;
1294 unsigned int mss = skb_shinfo(skb)->gso_size;
1295 unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1296 unsigned int f;
1297
1298 i = tx_ring->next_to_use;
1299
1300 while (len) {
1301 buffer_info = &tx_ring->buffer_info[i];
1302 size = min(len, IXGB_MAX_DATA_PER_TXD);
1303 /* Workaround for premature desc write-backs
1304 * in TSO mode. Append 4-byte sentinel desc */
1305 if (unlikely(mss && !nr_frags && size == len && size > 8))
1306 size -= 4;
1307
1308 buffer_info->length = size;
1309 WARN_ON(buffer_info->dma != 0);
1310 buffer_info->time_stamp = jiffies;
1311 buffer_info->mapped_as_page = false;
1312 buffer_info->dma = dma_map_single(&pdev->dev,
1313 skb->data + offset,
1314 size, DMA_TO_DEVICE);
1315 if (dma_mapping_error(&pdev->dev, buffer_info->dma))
1316 goto dma_error;
1317 buffer_info->next_to_watch = 0;
1318
1319 len -= size;
1320 offset += size;
1321 count++;
1322 if (len) {
1323 i++;
1324 if (i == tx_ring->count)
1325 i = 0;
1326 }
1327 }
1328
1329 for (f = 0; f < nr_frags; f++) {
1330 const skb_frag_t *frag = &skb_shinfo(skb)->frags[f];
1331 len = skb_frag_size(frag);
1332 offset = 0;
1333
1334 while (len) {
1335 i++;
1336 if (i == tx_ring->count)
1337 i = 0;
1338
1339 buffer_info = &tx_ring->buffer_info[i];
1340 size = min(len, IXGB_MAX_DATA_PER_TXD);
1341
1342 /* Workaround for premature desc write-backs
1343 * in TSO mode. Append 4-byte sentinel desc */
1344 if (unlikely(mss && (f == (nr_frags - 1))
1345 && size == len && size > 8))
1346 size -= 4;
1347
1348 buffer_info->length = size;
1349 buffer_info->time_stamp = jiffies;
1350 buffer_info->mapped_as_page = true;
1351 buffer_info->dma =
1352 skb_frag_dma_map(&pdev->dev, frag, offset, size,
1353 DMA_TO_DEVICE);
1354 if (dma_mapping_error(&pdev->dev, buffer_info->dma))
1355 goto dma_error;
1356 buffer_info->next_to_watch = 0;
1357
1358 len -= size;
1359 offset += size;
1360 count++;
1361 }
1362 }
1363 tx_ring->buffer_info[i].skb = skb;
1364 tx_ring->buffer_info[first].next_to_watch = i;
1365
1366 return count;
1367
1368dma_error:
1369 dev_err(&pdev->dev, "TX DMA map failed\n");
1370 buffer_info->dma = 0;
1371 if (count)
1372 count--;
1373
1374 while (count--) {
1375 if (i==0)
1376 i += tx_ring->count;
1377 i--;
1378 buffer_info = &tx_ring->buffer_info[i];
1379 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1380 }
1381
1382 return 0;
1383}
1384
1385static void
1386ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1387{
1388 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1389 struct ixgb_tx_desc *tx_desc = NULL;
1390 struct ixgb_buffer *buffer_info;
1391 u32 cmd_type_len = adapter->tx_cmd_type;
1392 u8 status = 0;
1393 u8 popts = 0;
1394 unsigned int i;
1395
1396 if (tx_flags & IXGB_TX_FLAGS_TSO) {
1397 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1398 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1399 }
1400
1401 if (tx_flags & IXGB_TX_FLAGS_CSUM)
1402 popts |= IXGB_TX_DESC_POPTS_TXSM;
1403
1404 if (tx_flags & IXGB_TX_FLAGS_VLAN)
1405 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1406
1407 i = tx_ring->next_to_use;
1408
1409 while (count--) {
1410 buffer_info = &tx_ring->buffer_info[i];
1411 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1412 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1413 tx_desc->cmd_type_len =
1414 cpu_to_le32(cmd_type_len | buffer_info->length);
1415 tx_desc->status = status;
1416 tx_desc->popts = popts;
1417 tx_desc->vlan = cpu_to_le16(vlan_id);
1418
1419 if (++i == tx_ring->count) i = 0;
1420 }
1421
1422 tx_desc->cmd_type_len |=
1423 cpu_to_le32(IXGB_TX_DESC_CMD_EOP | IXGB_TX_DESC_CMD_RS);
1424
1425 /* Force memory writes to complete before letting h/w
1426 * know there are new descriptors to fetch. (Only
1427 * applicable for weak-ordered memory model archs,
1428 * such as IA-64). */
1429 wmb();
1430
1431 tx_ring->next_to_use = i;
1432 IXGB_WRITE_REG(&adapter->hw, TDT, i);
1433}
1434
1435static int __ixgb_maybe_stop_tx(struct net_device *netdev, int size)
1436{
1437 struct ixgb_adapter *adapter = netdev_priv(netdev);
1438 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1439
1440 netif_stop_queue(netdev);
1441 /* Herbert's original patch had:
1442 * smp_mb__after_netif_stop_queue();
1443 * but since that doesn't exist yet, just open code it. */
1444 smp_mb();
1445
1446 /* We need to check again in a case another CPU has just
1447 * made room available. */
1448 if (likely(IXGB_DESC_UNUSED(tx_ring) < size))
1449 return -EBUSY;
1450
1451 /* A reprieve! */
1452 netif_start_queue(netdev);
1453 ++adapter->restart_queue;
1454 return 0;
1455}
1456
1457static int ixgb_maybe_stop_tx(struct net_device *netdev,
1458 struct ixgb_desc_ring *tx_ring, int size)
1459{
1460 if (likely(IXGB_DESC_UNUSED(tx_ring) >= size))
1461 return 0;
1462 return __ixgb_maybe_stop_tx(netdev, size);
1463}
1464
1465
1466/* Tx Descriptors needed, worst case */
1467#define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1468 (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1469#define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) /* skb->date */ + \
1470 MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 /* for context */ \
1471 + 1 /* one more needed for sentinel TSO workaround */
1472
1473static netdev_tx_t
1474ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1475{
1476 struct ixgb_adapter *adapter = netdev_priv(netdev);
1477 unsigned int first;
1478 unsigned int tx_flags = 0;
1479 int vlan_id = 0;
1480 int count = 0;
1481 int tso;
1482
1483 if (test_bit(__IXGB_DOWN, &adapter->flags)) {
1484 dev_kfree_skb_any(skb);
1485 return NETDEV_TX_OK;
1486 }
1487
1488 if (skb->len <= 0) {
1489 dev_kfree_skb_any(skb);
1490 return NETDEV_TX_OK;
1491 }
1492
1493 if (unlikely(ixgb_maybe_stop_tx(netdev, &adapter->tx_ring,
1494 DESC_NEEDED)))
1495 return NETDEV_TX_BUSY;
1496
1497 if (skb_vlan_tag_present(skb)) {
1498 tx_flags |= IXGB_TX_FLAGS_VLAN;
1499 vlan_id = skb_vlan_tag_get(skb);
1500 }
1501
1502 first = adapter->tx_ring.next_to_use;
1503
1504 tso = ixgb_tso(adapter, skb);
1505 if (tso < 0) {
1506 dev_kfree_skb_any(skb);
1507 return NETDEV_TX_OK;
1508 }
1509
1510 if (likely(tso))
1511 tx_flags |= IXGB_TX_FLAGS_TSO;
1512 else if (ixgb_tx_csum(adapter, skb))
1513 tx_flags |= IXGB_TX_FLAGS_CSUM;
1514
1515 count = ixgb_tx_map(adapter, skb, first);
1516
1517 if (count) {
1518 ixgb_tx_queue(adapter, count, vlan_id, tx_flags);
1519 /* Make sure there is space in the ring for the next send. */
1520 ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED);
1521
1522 } else {
1523 dev_kfree_skb_any(skb);
1524 adapter->tx_ring.buffer_info[first].time_stamp = 0;
1525 adapter->tx_ring.next_to_use = first;
1526 }
1527
1528 return NETDEV_TX_OK;
1529}
1530
1531/**
1532 * ixgb_tx_timeout - Respond to a Tx Hang
1533 * @netdev: network interface device structure
1534 * @txqueue: queue hanging (unused)
1535 **/
1536
1537static void
1538ixgb_tx_timeout(struct net_device *netdev, unsigned int __always_unused txqueue)
1539{
1540 struct ixgb_adapter *adapter = netdev_priv(netdev);
1541
1542 /* Do the reset outside of interrupt context */
1543 schedule_work(&adapter->tx_timeout_task);
1544}
1545
1546static void
1547ixgb_tx_timeout_task(struct work_struct *work)
1548{
1549 struct ixgb_adapter *adapter =
1550 container_of(work, struct ixgb_adapter, tx_timeout_task);
1551
1552 adapter->tx_timeout_count++;
1553 ixgb_down(adapter, true);
1554 ixgb_up(adapter);
1555}
1556
1557/**
1558 * ixgb_change_mtu - Change the Maximum Transfer Unit
1559 * @netdev: network interface device structure
1560 * @new_mtu: new value for maximum frame size
1561 *
1562 * Returns 0 on success, negative on failure
1563 **/
1564
1565static int
1566ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1567{
1568 struct ixgb_adapter *adapter = netdev_priv(netdev);
1569 int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1570
1571 if (netif_running(netdev))
1572 ixgb_down(adapter, true);
1573
1574 adapter->rx_buffer_len = max_frame + 8; /* + 8 for errata */
1575
1576 netdev->mtu = new_mtu;
1577
1578 if (netif_running(netdev))
1579 ixgb_up(adapter);
1580
1581 return 0;
1582}
1583
1584/**
1585 * ixgb_update_stats - Update the board statistics counters.
1586 * @adapter: board private structure
1587 **/
1588
1589void
1590ixgb_update_stats(struct ixgb_adapter *adapter)
1591{
1592 struct net_device *netdev = adapter->netdev;
1593 struct pci_dev *pdev = adapter->pdev;
1594
1595 /* Prevent stats update while adapter is being reset */
1596 if (pci_channel_offline(pdev))
1597 return;
1598
1599 if ((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1600 (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1601 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1602 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1603 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1604 u64 bcast = ((u64)bcast_h << 32) | bcast_l;
1605
1606 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1607 /* fix up multicast stats by removing broadcasts */
1608 if (multi >= bcast)
1609 multi -= bcast;
1610
1611 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1612 adapter->stats.mprch += (multi >> 32);
1613 adapter->stats.bprcl += bcast_l;
1614 adapter->stats.bprch += bcast_h;
1615 } else {
1616 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1617 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1618 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1619 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1620 }
1621 adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1622 adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1623 adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1624 adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1625 adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1626 adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1627 adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1628 adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1629 adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1630 adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1631 adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1632 adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1633 adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1634 adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1635 adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1636 adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1637 adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1638 adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1639 adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1640 adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1641 adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1642 adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1643 adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1644 adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1645 adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1646 adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1647 adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1648 adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1649 adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1650 adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1651 adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1652 adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1653 adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1654 adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1655 adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1656 adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1657 adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1658 adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1659 adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1660 adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1661 adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1662 adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1663 adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1664 adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1665 adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1666 adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1667 adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1668 adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1669 adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1670 adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1671 adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1672 adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1673 adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1674 adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1675 adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1676 adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1677
1678 /* Fill out the OS statistics structure */
1679
1680 netdev->stats.rx_packets = adapter->stats.gprcl;
1681 netdev->stats.tx_packets = adapter->stats.gptcl;
1682 netdev->stats.rx_bytes = adapter->stats.gorcl;
1683 netdev->stats.tx_bytes = adapter->stats.gotcl;
1684 netdev->stats.multicast = adapter->stats.mprcl;
1685 netdev->stats.collisions = 0;
1686
1687 /* ignore RLEC as it reports errors for padded (<64bytes) frames
1688 * with a length in the type/len field */
1689 netdev->stats.rx_errors =
1690 /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1691 adapter->stats.ruc +
1692 adapter->stats.roc /*+ adapter->stats.rlec */ +
1693 adapter->stats.icbc +
1694 adapter->stats.ecbc + adapter->stats.mpc;
1695
1696 /* see above
1697 * netdev->stats.rx_length_errors = adapter->stats.rlec;
1698 */
1699
1700 netdev->stats.rx_crc_errors = adapter->stats.crcerrs;
1701 netdev->stats.rx_fifo_errors = adapter->stats.mpc;
1702 netdev->stats.rx_missed_errors = adapter->stats.mpc;
1703 netdev->stats.rx_over_errors = adapter->stats.mpc;
1704
1705 netdev->stats.tx_errors = 0;
1706 netdev->stats.rx_frame_errors = 0;
1707 netdev->stats.tx_aborted_errors = 0;
1708 netdev->stats.tx_carrier_errors = 0;
1709 netdev->stats.tx_fifo_errors = 0;
1710 netdev->stats.tx_heartbeat_errors = 0;
1711 netdev->stats.tx_window_errors = 0;
1712}
1713
1714#define IXGB_MAX_INTR 10
1715/**
1716 * ixgb_intr - Interrupt Handler
1717 * @irq: interrupt number
1718 * @data: pointer to a network interface device structure
1719 **/
1720
1721static irqreturn_t
1722ixgb_intr(int irq, void *data)
1723{
1724 struct net_device *netdev = data;
1725 struct ixgb_adapter *adapter = netdev_priv(netdev);
1726 struct ixgb_hw *hw = &adapter->hw;
1727 u32 icr = IXGB_READ_REG(hw, ICR);
1728
1729 if (unlikely(!icr))
1730 return IRQ_NONE; /* Not our interrupt */
1731
1732 if (unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC)))
1733 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1734 mod_timer(&adapter->watchdog_timer, jiffies);
1735
1736 if (napi_schedule_prep(&adapter->napi)) {
1737
1738 /* Disable interrupts and register for poll. The flush
1739 of the posted write is intentionally left out.
1740 */
1741
1742 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1743 __napi_schedule(&adapter->napi);
1744 }
1745 return IRQ_HANDLED;
1746}
1747
1748/**
1749 * ixgb_clean - NAPI Rx polling callback
1750 * @napi: napi struct pointer
1751 * @budget: max number of receives to clean
1752 **/
1753
1754static int
1755ixgb_clean(struct napi_struct *napi, int budget)
1756{
1757 struct ixgb_adapter *adapter = container_of(napi, struct ixgb_adapter, napi);
1758 int work_done = 0;
1759
1760 ixgb_clean_tx_irq(adapter);
1761 ixgb_clean_rx_irq(adapter, &work_done, budget);
1762
1763 /* If budget not fully consumed, exit the polling mode */
1764 if (work_done < budget) {
1765 napi_complete_done(napi, work_done);
1766 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1767 ixgb_irq_enable(adapter);
1768 }
1769
1770 return work_done;
1771}
1772
1773/**
1774 * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1775 * @adapter: board private structure
1776 **/
1777
1778static bool
1779ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1780{
1781 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1782 struct net_device *netdev = adapter->netdev;
1783 struct ixgb_tx_desc *tx_desc, *eop_desc;
1784 struct ixgb_buffer *buffer_info;
1785 unsigned int i, eop;
1786 bool cleaned = false;
1787
1788 i = tx_ring->next_to_clean;
1789 eop = tx_ring->buffer_info[i].next_to_watch;
1790 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1791
1792 while (eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1793
1794 rmb(); /* read buffer_info after eop_desc */
1795 for (cleaned = false; !cleaned; ) {
1796 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1797 buffer_info = &tx_ring->buffer_info[i];
1798
1799 if (tx_desc->popts &
1800 (IXGB_TX_DESC_POPTS_TXSM |
1801 IXGB_TX_DESC_POPTS_IXSM))
1802 adapter->hw_csum_tx_good++;
1803
1804 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1805
1806 *(u32 *)&(tx_desc->status) = 0;
1807
1808 cleaned = (i == eop);
1809 if (++i == tx_ring->count) i = 0;
1810 }
1811
1812 eop = tx_ring->buffer_info[i].next_to_watch;
1813 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1814 }
1815
1816 tx_ring->next_to_clean = i;
1817
1818 if (unlikely(cleaned && netif_carrier_ok(netdev) &&
1819 IXGB_DESC_UNUSED(tx_ring) >= DESC_NEEDED)) {
1820 /* Make sure that anybody stopping the queue after this
1821 * sees the new next_to_clean. */
1822 smp_mb();
1823
1824 if (netif_queue_stopped(netdev) &&
1825 !(test_bit(__IXGB_DOWN, &adapter->flags))) {
1826 netif_wake_queue(netdev);
1827 ++adapter->restart_queue;
1828 }
1829 }
1830
1831 if (adapter->detect_tx_hung) {
1832 /* detect a transmit hang in hardware, this serializes the
1833 * check with the clearing of time_stamp and movement of i */
1834 adapter->detect_tx_hung = false;
1835 if (tx_ring->buffer_info[eop].time_stamp &&
1836 time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ)
1837 && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1838 IXGB_STATUS_TXOFF)) {
1839 /* detected Tx unit hang */
1840 netif_err(adapter, drv, adapter->netdev,
1841 "Detected Tx Unit Hang\n"
1842 " TDH <%x>\n"
1843 " TDT <%x>\n"
1844 " next_to_use <%x>\n"
1845 " next_to_clean <%x>\n"
1846 "buffer_info[next_to_clean]\n"
1847 " time_stamp <%lx>\n"
1848 " next_to_watch <%x>\n"
1849 " jiffies <%lx>\n"
1850 " next_to_watch.status <%x>\n",
1851 IXGB_READ_REG(&adapter->hw, TDH),
1852 IXGB_READ_REG(&adapter->hw, TDT),
1853 tx_ring->next_to_use,
1854 tx_ring->next_to_clean,
1855 tx_ring->buffer_info[eop].time_stamp,
1856 eop,
1857 jiffies,
1858 eop_desc->status);
1859 netif_stop_queue(netdev);
1860 }
1861 }
1862
1863 return cleaned;
1864}
1865
1866/**
1867 * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1868 * @adapter: board private structure
1869 * @rx_desc: receive descriptor
1870 * @skb: socket buffer with received data
1871 **/
1872
1873static void
1874ixgb_rx_checksum(struct ixgb_adapter *adapter,
1875 struct ixgb_rx_desc *rx_desc,
1876 struct sk_buff *skb)
1877{
1878 /* Ignore Checksum bit is set OR
1879 * TCP Checksum has not been calculated
1880 */
1881 if ((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1882 (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1883 skb_checksum_none_assert(skb);
1884 return;
1885 }
1886
1887 /* At this point we know the hardware did the TCP checksum */
1888 /* now look at the TCP checksum error bit */
1889 if (rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1890 /* let the stack verify checksum errors */
1891 skb_checksum_none_assert(skb);
1892 adapter->hw_csum_rx_error++;
1893 } else {
1894 /* TCP checksum is good */
1895 skb->ip_summed = CHECKSUM_UNNECESSARY;
1896 adapter->hw_csum_rx_good++;
1897 }
1898}
1899
1900/*
1901 * this should improve performance for small packets with large amounts
1902 * of reassembly being done in the stack
1903 */
1904static void ixgb_check_copybreak(struct napi_struct *napi,
1905 struct ixgb_buffer *buffer_info,
1906 u32 length, struct sk_buff **skb)
1907{
1908 struct sk_buff *new_skb;
1909
1910 if (length > copybreak)
1911 return;
1912
1913 new_skb = napi_alloc_skb(napi, length);
1914 if (!new_skb)
1915 return;
1916
1917 skb_copy_to_linear_data_offset(new_skb, -NET_IP_ALIGN,
1918 (*skb)->data - NET_IP_ALIGN,
1919 length + NET_IP_ALIGN);
1920 /* save the skb in buffer_info as good */
1921 buffer_info->skb = *skb;
1922 *skb = new_skb;
1923}
1924
1925/**
1926 * ixgb_clean_rx_irq - Send received data up the network stack,
1927 * @adapter: board private structure
1928 * @work_done: output pointer to amount of packets cleaned
1929 * @work_to_do: how much work we can complete
1930 **/
1931
1932static bool
1933ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
1934{
1935 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1936 struct net_device *netdev = adapter->netdev;
1937 struct pci_dev *pdev = adapter->pdev;
1938 struct ixgb_rx_desc *rx_desc, *next_rxd;
1939 struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
1940 u32 length;
1941 unsigned int i, j;
1942 int cleaned_count = 0;
1943 bool cleaned = false;
1944
1945 i = rx_ring->next_to_clean;
1946 rx_desc = IXGB_RX_DESC(*rx_ring, i);
1947 buffer_info = &rx_ring->buffer_info[i];
1948
1949 while (rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
1950 struct sk_buff *skb;
1951 u8 status;
1952
1953 if (*work_done >= work_to_do)
1954 break;
1955
1956 (*work_done)++;
1957 rmb(); /* read descriptor and rx_buffer_info after status DD */
1958 status = rx_desc->status;
1959 skb = buffer_info->skb;
1960 buffer_info->skb = NULL;
1961
1962 prefetch(skb->data - NET_IP_ALIGN);
1963
1964 if (++i == rx_ring->count)
1965 i = 0;
1966 next_rxd = IXGB_RX_DESC(*rx_ring, i);
1967 prefetch(next_rxd);
1968
1969 j = i + 1;
1970 if (j == rx_ring->count)
1971 j = 0;
1972 next2_buffer = &rx_ring->buffer_info[j];
1973 prefetch(next2_buffer);
1974
1975 next_buffer = &rx_ring->buffer_info[i];
1976
1977 cleaned = true;
1978 cleaned_count++;
1979
1980 dma_unmap_single(&pdev->dev,
1981 buffer_info->dma,
1982 buffer_info->length,
1983 DMA_FROM_DEVICE);
1984 buffer_info->dma = 0;
1985
1986 length = le16_to_cpu(rx_desc->length);
1987 rx_desc->length = 0;
1988
1989 if (unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
1990
1991 /* All receives must fit into a single buffer */
1992
1993 pr_debug("Receive packet consumed multiple buffers length<%x>\n",
1994 length);
1995
1996 dev_kfree_skb_irq(skb);
1997 goto rxdesc_done;
1998 }
1999
2000 if (unlikely(rx_desc->errors &
2001 (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE |
2002 IXGB_RX_DESC_ERRORS_P | IXGB_RX_DESC_ERRORS_RXE))) {
2003 dev_kfree_skb_irq(skb);
2004 goto rxdesc_done;
2005 }
2006
2007 ixgb_check_copybreak(&adapter->napi, buffer_info, length, &skb);
2008
2009 /* Good Receive */
2010 skb_put(skb, length);
2011
2012 /* Receive Checksum Offload */
2013 ixgb_rx_checksum(adapter, rx_desc, skb);
2014
2015 skb->protocol = eth_type_trans(skb, netdev);
2016 if (status & IXGB_RX_DESC_STATUS_VP)
2017 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
2018 le16_to_cpu(rx_desc->special));
2019
2020 netif_receive_skb(skb);
2021
2022rxdesc_done:
2023 /* clean up descriptor, might be written over by hw */
2024 rx_desc->status = 0;
2025
2026 /* return some buffers to hardware, one at a time is too slow */
2027 if (unlikely(cleaned_count >= IXGB_RX_BUFFER_WRITE)) {
2028 ixgb_alloc_rx_buffers(adapter, cleaned_count);
2029 cleaned_count = 0;
2030 }
2031
2032 /* use prefetched values */
2033 rx_desc = next_rxd;
2034 buffer_info = next_buffer;
2035 }
2036
2037 rx_ring->next_to_clean = i;
2038
2039 cleaned_count = IXGB_DESC_UNUSED(rx_ring);
2040 if (cleaned_count)
2041 ixgb_alloc_rx_buffers(adapter, cleaned_count);
2042
2043 return cleaned;
2044}
2045
2046/**
2047 * ixgb_alloc_rx_buffers - Replace used receive buffers
2048 * @adapter: address of board private structure
2049 * @cleaned_count: how many buffers to allocate
2050 **/
2051
2052static void
2053ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter, int cleaned_count)
2054{
2055 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2056 struct net_device *netdev = adapter->netdev;
2057 struct pci_dev *pdev = adapter->pdev;
2058 struct ixgb_rx_desc *rx_desc;
2059 struct ixgb_buffer *buffer_info;
2060 struct sk_buff *skb;
2061 unsigned int i;
2062 long cleancount;
2063
2064 i = rx_ring->next_to_use;
2065 buffer_info = &rx_ring->buffer_info[i];
2066 cleancount = IXGB_DESC_UNUSED(rx_ring);
2067
2068
2069 /* leave three descriptors unused */
2070 while (--cleancount > 2 && cleaned_count--) {
2071 /* recycle! its good for you */
2072 skb = buffer_info->skb;
2073 if (skb) {
2074 skb_trim(skb, 0);
2075 goto map_skb;
2076 }
2077
2078 skb = netdev_alloc_skb_ip_align(netdev, adapter->rx_buffer_len);
2079 if (unlikely(!skb)) {
2080 /* Better luck next round */
2081 adapter->alloc_rx_buff_failed++;
2082 break;
2083 }
2084
2085 buffer_info->skb = skb;
2086 buffer_info->length = adapter->rx_buffer_len;
2087map_skb:
2088 buffer_info->dma = dma_map_single(&pdev->dev,
2089 skb->data,
2090 adapter->rx_buffer_len,
2091 DMA_FROM_DEVICE);
2092 if (dma_mapping_error(&pdev->dev, buffer_info->dma)) {
2093 adapter->alloc_rx_buff_failed++;
2094 break;
2095 }
2096
2097 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2098 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
2099 /* guarantee DD bit not set now before h/w gets descriptor
2100 * this is the rest of the workaround for h/w double
2101 * writeback. */
2102 rx_desc->status = 0;
2103
2104
2105 if (++i == rx_ring->count)
2106 i = 0;
2107 buffer_info = &rx_ring->buffer_info[i];
2108 }
2109
2110 if (likely(rx_ring->next_to_use != i)) {
2111 rx_ring->next_to_use = i;
2112 if (unlikely(i-- == 0))
2113 i = (rx_ring->count - 1);
2114
2115 /* Force memory writes to complete before letting h/w
2116 * know there are new descriptors to fetch. (Only
2117 * applicable for weak-ordered memory model archs, such
2118 * as IA-64). */
2119 wmb();
2120 IXGB_WRITE_REG(&adapter->hw, RDT, i);
2121 }
2122}
2123
2124static void
2125ixgb_vlan_strip_enable(struct ixgb_adapter *adapter)
2126{
2127 u32 ctrl;
2128
2129 /* enable VLAN tag insert/strip */
2130 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2131 ctrl |= IXGB_CTRL0_VME;
2132 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2133}
2134
2135static void
2136ixgb_vlan_strip_disable(struct ixgb_adapter *adapter)
2137{
2138 u32 ctrl;
2139
2140 /* disable VLAN tag insert/strip */
2141 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2142 ctrl &= ~IXGB_CTRL0_VME;
2143 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2144}
2145
2146static int
2147ixgb_vlan_rx_add_vid(struct net_device *netdev, __be16 proto, u16 vid)
2148{
2149 struct ixgb_adapter *adapter = netdev_priv(netdev);
2150 u32 vfta, index;
2151
2152 /* add VID to filter table */
2153
2154 index = (vid >> 5) & 0x7F;
2155 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2156 vfta |= (1 << (vid & 0x1F));
2157 ixgb_write_vfta(&adapter->hw, index, vfta);
2158 set_bit(vid, adapter->active_vlans);
2159
2160 return 0;
2161}
2162
2163static int
2164ixgb_vlan_rx_kill_vid(struct net_device *netdev, __be16 proto, u16 vid)
2165{
2166 struct ixgb_adapter *adapter = netdev_priv(netdev);
2167 u32 vfta, index;
2168
2169 /* remove VID from filter table */
2170
2171 index = (vid >> 5) & 0x7F;
2172 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2173 vfta &= ~(1 << (vid & 0x1F));
2174 ixgb_write_vfta(&adapter->hw, index, vfta);
2175 clear_bit(vid, adapter->active_vlans);
2176
2177 return 0;
2178}
2179
2180static void
2181ixgb_restore_vlan(struct ixgb_adapter *adapter)
2182{
2183 u16 vid;
2184
2185 for_each_set_bit(vid, adapter->active_vlans, VLAN_N_VID)
2186 ixgb_vlan_rx_add_vid(adapter->netdev, htons(ETH_P_8021Q), vid);
2187}
2188
2189/**
2190 * ixgb_io_error_detected - called when PCI error is detected
2191 * @pdev: pointer to pci device with error
2192 * @state: pci channel state after error
2193 *
2194 * This callback is called by the PCI subsystem whenever
2195 * a PCI bus error is detected.
2196 */
2197static pci_ers_result_t ixgb_io_error_detected(struct pci_dev *pdev,
2198 pci_channel_state_t state)
2199{
2200 struct net_device *netdev = pci_get_drvdata(pdev);
2201 struct ixgb_adapter *adapter = netdev_priv(netdev);
2202
2203 netif_device_detach(netdev);
2204
2205 if (state == pci_channel_io_perm_failure)
2206 return PCI_ERS_RESULT_DISCONNECT;
2207
2208 if (netif_running(netdev))
2209 ixgb_down(adapter, true);
2210
2211 pci_disable_device(pdev);
2212
2213 /* Request a slot reset. */
2214 return PCI_ERS_RESULT_NEED_RESET;
2215}
2216
2217/**
2218 * ixgb_io_slot_reset - called after the pci bus has been reset.
2219 * @pdev: pointer to pci device with error
2220 *
2221 * This callback is called after the PCI bus has been reset.
2222 * Basically, this tries to restart the card from scratch.
2223 * This is a shortened version of the device probe/discovery code,
2224 * it resembles the first-half of the ixgb_probe() routine.
2225 */
2226static pci_ers_result_t ixgb_io_slot_reset(struct pci_dev *pdev)
2227{
2228 struct net_device *netdev = pci_get_drvdata(pdev);
2229 struct ixgb_adapter *adapter = netdev_priv(netdev);
2230
2231 if (pci_enable_device(pdev)) {
2232 netif_err(adapter, probe, adapter->netdev,
2233 "Cannot re-enable PCI device after reset\n");
2234 return PCI_ERS_RESULT_DISCONNECT;
2235 }
2236
2237 /* Perform card reset only on one instance of the card */
2238 if (0 != PCI_FUNC (pdev->devfn))
2239 return PCI_ERS_RESULT_RECOVERED;
2240
2241 pci_set_master(pdev);
2242
2243 netif_carrier_off(netdev);
2244 netif_stop_queue(netdev);
2245 ixgb_reset(adapter);
2246
2247 /* Make sure the EEPROM is good */
2248 if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
2249 netif_err(adapter, probe, adapter->netdev,
2250 "After reset, the EEPROM checksum is not valid\n");
2251 return PCI_ERS_RESULT_DISCONNECT;
2252 }
2253 ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
2254 memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
2255
2256 if (!is_valid_ether_addr(netdev->perm_addr)) {
2257 netif_err(adapter, probe, adapter->netdev,
2258 "After reset, invalid MAC address\n");
2259 return PCI_ERS_RESULT_DISCONNECT;
2260 }
2261
2262 return PCI_ERS_RESULT_RECOVERED;
2263}
2264
2265/**
2266 * ixgb_io_resume - called when its OK to resume normal operations
2267 * @pdev: pointer to pci device with error
2268 *
2269 * The error recovery driver tells us that its OK to resume
2270 * normal operation. Implementation resembles the second-half
2271 * of the ixgb_probe() routine.
2272 */
2273static void ixgb_io_resume(struct pci_dev *pdev)
2274{
2275 struct net_device *netdev = pci_get_drvdata(pdev);
2276 struct ixgb_adapter *adapter = netdev_priv(netdev);
2277
2278 pci_set_master(pdev);
2279
2280 if (netif_running(netdev)) {
2281 if (ixgb_up(adapter)) {
2282 pr_err("can't bring device back up after reset\n");
2283 return;
2284 }
2285 }
2286
2287 netif_device_attach(netdev);
2288 mod_timer(&adapter->watchdog_timer, jiffies);
2289}
2290
2291/* ixgb_main.c */