summaryrefslogtreecommitdiff
path: root/drivers/net/ethernet/wangxun/txgbe/txgbe_main.c
blob: 5b8a121fb496b3d68557bb4e7cb8c53723bbcc47 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2015 - 2022 Beijing WangXun Technology Co., Ltd. */

#include <linux/types.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/netdevice.h>
#include <linux/string.h>
#include <linux/etherdevice.h>
#include <net/ip.h>
#include <linux/if_vlan.h>

#include "../libwx/wx_type.h"
#include "../libwx/wx_lib.h"
#include "../libwx/wx_hw.h"
#include "txgbe_type.h"
#include "txgbe_hw.h"
#include "txgbe_ethtool.h"

char txgbe_driver_name[] = "txgbe";

/* txgbe_pci_tbl - PCI Device ID Table
 *
 * Wildcard entries (PCI_ANY_ID) should come last
 * Last entry must be all 0s
 *
 * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
 *   Class, Class Mask, private data (not used) }
 */
static const struct pci_device_id txgbe_pci_tbl[] = {
	{ PCI_VDEVICE(WANGXUN, TXGBE_DEV_ID_SP1000), 0},
	{ PCI_VDEVICE(WANGXUN, TXGBE_DEV_ID_WX1820), 0},
	/* required last entry */
	{ .device = 0 }
};

#define DEFAULT_DEBUG_LEVEL_SHIFT 3

static void txgbe_check_minimum_link(struct wx *wx)
{
	struct pci_dev *pdev;

	pdev = wx->pdev;
	pcie_print_link_status(pdev);
}

/**
 * txgbe_enumerate_functions - Get the number of ports this device has
 * @wx: wx structure
 *
 * This function enumerates the phsyical functions co-located on a single slot,
 * in order to determine how many ports a device has. This is most useful in
 * determining the required GT/s of PCIe bandwidth necessary for optimal
 * performance.
 **/
static int txgbe_enumerate_functions(struct wx *wx)
{
	struct pci_dev *entry, *pdev = wx->pdev;
	int physfns = 0;

	list_for_each_entry(entry, &pdev->bus->devices, bus_list) {
		/* When the devices on the bus don't all match our device ID,
		 * we can't reliably determine the correct number of
		 * functions. This can occur if a function has been direct
		 * attached to a virtual machine using VT-d.
		 */
		if (entry->vendor != pdev->vendor ||
		    entry->device != pdev->device)
			return -EINVAL;

		physfns++;
	}

	return physfns;
}

/**
 * txgbe_irq_enable - Enable default interrupt generation settings
 * @wx: pointer to private structure
 * @queues: enable irqs for queues
 **/
static void txgbe_irq_enable(struct wx *wx, bool queues)
{
	/* unmask interrupt */
	wx_intr_enable(wx, TXGBE_INTR_MISC(wx));
	if (queues)
		wx_intr_enable(wx, TXGBE_INTR_QALL(wx));
}

/**
 * txgbe_intr - msi/legacy mode Interrupt Handler
 * @irq: interrupt number
 * @data: pointer to a network interface device structure
 **/
static irqreturn_t txgbe_intr(int __always_unused irq, void *data)
{
	struct wx_q_vector *q_vector;
	struct wx *wx  = data;
	struct pci_dev *pdev;
	u32 eicr;

	q_vector = wx->q_vector[0];
	pdev = wx->pdev;

	eicr = wx_misc_isb(wx, WX_ISB_VEC0);
	if (!eicr) {
		/* shared interrupt alert!
		 * the interrupt that we masked before the ICR read.
		 */
		if (netif_running(wx->netdev))
			txgbe_irq_enable(wx, true);
		return IRQ_NONE;        /* Not our interrupt */
	}
	wx->isb_mem[WX_ISB_VEC0] = 0;
	if (!(pdev->msi_enabled))
		wr32(wx, WX_PX_INTA, 1);

	wx->isb_mem[WX_ISB_MISC] = 0;
	/* would disable interrupts here but it is auto disabled */
	napi_schedule_irqoff(&q_vector->napi);

	/* re-enable link(maybe) and non-queue interrupts, no flush.
	 * txgbe_poll will re-enable the queue interrupts
	 */
	if (netif_running(wx->netdev))
		txgbe_irq_enable(wx, false);

	return IRQ_HANDLED;
}

static irqreturn_t txgbe_msix_other(int __always_unused irq, void *data)
{
	struct wx *wx = data;

	/* re-enable the original interrupt state */
	if (netif_running(wx->netdev))
		txgbe_irq_enable(wx, false);

	return IRQ_HANDLED;
}

/**
 * txgbe_request_msix_irqs - Initialize MSI-X interrupts
 * @wx: board private structure
 *
 * Allocate MSI-X vectors and request interrupts from the kernel.
 **/
static int txgbe_request_msix_irqs(struct wx *wx)
{
	struct net_device *netdev = wx->netdev;
	int vector, err;

	for (vector = 0; vector < wx->num_q_vectors; vector++) {
		struct wx_q_vector *q_vector = wx->q_vector[vector];
		struct msix_entry *entry = &wx->msix_entries[vector];

		if (q_vector->tx.ring && q_vector->rx.ring)
			snprintf(q_vector->name, sizeof(q_vector->name) - 1,
				 "%s-TxRx-%d", netdev->name, entry->entry);
		else
			/* skip this unused q_vector */
			continue;

		err = request_irq(entry->vector, wx_msix_clean_rings, 0,
				  q_vector->name, q_vector);
		if (err) {
			wx_err(wx, "request_irq failed for MSIX interrupt %s Error: %d\n",
			       q_vector->name, err);
			goto free_queue_irqs;
		}
	}

	err = request_irq(wx->msix_entries[vector].vector,
			  txgbe_msix_other, 0, netdev->name, wx);
	if (err) {
		wx_err(wx, "request_irq for msix_other failed: %d\n", err);
		goto free_queue_irqs;
	}

	return 0;

free_queue_irqs:
	while (vector) {
		vector--;
		free_irq(wx->msix_entries[vector].vector,
			 wx->q_vector[vector]);
	}
	wx_reset_interrupt_capability(wx);
	return err;
}

/**
 * txgbe_request_irq - initialize interrupts
 * @wx: board private structure
 *
 * Attempt to configure interrupts using the best available
 * capabilities of the hardware and kernel.
 **/
static int txgbe_request_irq(struct wx *wx)
{
	struct net_device *netdev = wx->netdev;
	struct pci_dev *pdev = wx->pdev;
	int err;

	if (pdev->msix_enabled)
		err = txgbe_request_msix_irqs(wx);
	else if (pdev->msi_enabled)
		err = request_irq(wx->pdev->irq, &txgbe_intr, 0,
				  netdev->name, wx);
	else
		err = request_irq(wx->pdev->irq, &txgbe_intr, IRQF_SHARED,
				  netdev->name, wx);

	if (err)
		wx_err(wx, "request_irq failed, Error %d\n", err);

	return err;
}

static void txgbe_up_complete(struct wx *wx)
{
	u32 reg;

	wx_control_hw(wx, true);
	wx_configure_vectors(wx);

	/* make sure to complete pre-operations */
	smp_mb__before_atomic();
	wx_napi_enable_all(wx);

	/* clear any pending interrupts, may auto mask */
	rd32(wx, WX_PX_IC(0));
	rd32(wx, WX_PX_IC(1));
	rd32(wx, WX_PX_MISC_IC);
	txgbe_irq_enable(wx, true);

	/* Configure MAC Rx and Tx when link is up */
	reg = rd32(wx, WX_MAC_RX_CFG);
	wr32(wx, WX_MAC_RX_CFG, reg);
	wr32(wx, WX_MAC_PKT_FLT, WX_MAC_PKT_FLT_PR);
	reg = rd32(wx, WX_MAC_WDG_TIMEOUT);
	wr32(wx, WX_MAC_WDG_TIMEOUT, reg);
	reg = rd32(wx, WX_MAC_TX_CFG);
	wr32(wx, WX_MAC_TX_CFG, (reg & ~WX_MAC_TX_CFG_SPEED_MASK) | WX_MAC_TX_CFG_SPEED_10G);

	/* enable transmits */
	netif_tx_start_all_queues(wx->netdev);
	netif_carrier_on(wx->netdev);
}

static void txgbe_reset(struct wx *wx)
{
	struct net_device *netdev = wx->netdev;
	u8 old_addr[ETH_ALEN];
	int err;

	err = txgbe_reset_hw(wx);
	if (err != 0)
		wx_err(wx, "Hardware Error: %d\n", err);

	/* do not flush user set addresses */
	memcpy(old_addr, &wx->mac_table[0].addr, netdev->addr_len);
	wx_flush_sw_mac_table(wx);
	wx_mac_set_default_filter(wx, old_addr);
}

static void txgbe_disable_device(struct wx *wx)
{
	struct net_device *netdev = wx->netdev;
	u32 i;

	wx_disable_pcie_master(wx);
	/* disable receives */
	wx_disable_rx(wx);

	/* disable all enabled rx queues */
	for (i = 0; i < wx->num_rx_queues; i++)
		/* this call also flushes the previous write */
		wx_disable_rx_queue(wx, wx->rx_ring[i]);

	netif_tx_stop_all_queues(netdev);
	netif_carrier_off(netdev);
	netif_tx_disable(netdev);

	wx_irq_disable(wx);
	wx_napi_disable_all(wx);

	if (wx->bus.func < 2)
		wr32m(wx, TXGBE_MIS_PRB_CTL, TXGBE_MIS_PRB_CTL_LAN_UP(wx->bus.func), 0);
	else
		wx_err(wx, "%s: invalid bus lan id %d\n",
		       __func__, wx->bus.func);

	if (!(((wx->subsystem_device_id & WX_NCSI_MASK) == WX_NCSI_SUP) ||
	      ((wx->subsystem_device_id & WX_WOL_MASK) == WX_WOL_SUP))) {
		/* disable mac transmiter */
		wr32m(wx, WX_MAC_TX_CFG, WX_MAC_TX_CFG_TE, 0);
	}

	/* disable transmits in the hardware now that interrupts are off */
	for (i = 0; i < wx->num_tx_queues; i++) {
		u8 reg_idx = wx->tx_ring[i]->reg_idx;

		wr32(wx, WX_PX_TR_CFG(reg_idx), WX_PX_TR_CFG_SWFLSH);
	}

	/* Disable the Tx DMA engine */
	wr32m(wx, WX_TDM_CTL, WX_TDM_CTL_TE, 0);
}

static void txgbe_down(struct wx *wx)
{
	txgbe_disable_device(wx);
	txgbe_reset(wx);

	wx_clean_all_tx_rings(wx);
	wx_clean_all_rx_rings(wx);
}

/**
 * txgbe_sw_init - Initialize general software structures (struct wx)
 * @wx: board private structure to initialize
 **/
static int txgbe_sw_init(struct wx *wx)
{
	u16 msix_count = 0;
	int err;

	wx->mac.num_rar_entries = TXGBE_SP_RAR_ENTRIES;
	wx->mac.max_tx_queues = TXGBE_SP_MAX_TX_QUEUES;
	wx->mac.max_rx_queues = TXGBE_SP_MAX_RX_QUEUES;
	wx->mac.mcft_size = TXGBE_SP_MC_TBL_SIZE;
	wx->mac.rx_pb_size = TXGBE_SP_RX_PB_SIZE;
	wx->mac.tx_pb_size = TXGBE_SP_TDB_PB_SZ;

	/* PCI config space info */
	err = wx_sw_init(wx);
	if (err < 0) {
		wx_err(wx, "read of internal subsystem device id failed\n");
		return err;
	}

	switch (wx->device_id) {
	case TXGBE_DEV_ID_SP1000:
	case TXGBE_DEV_ID_WX1820:
		wx->mac.type = wx_mac_sp;
		break;
	default:
		wx->mac.type = wx_mac_unknown;
		break;
	}

	/* Set common capability flags and settings */
	wx->max_q_vectors = TXGBE_MAX_MSIX_VECTORS;
	err = wx_get_pcie_msix_counts(wx, &msix_count, TXGBE_MAX_MSIX_VECTORS);
	if (err)
		wx_err(wx, "Do not support MSI-X\n");
	wx->mac.max_msix_vectors = msix_count;

	/* enable itr by default in dynamic mode */
	wx->rx_itr_setting = 1;
	wx->tx_itr_setting = 1;

	/* set default ring sizes */
	wx->tx_ring_count = TXGBE_DEFAULT_TXD;
	wx->rx_ring_count = TXGBE_DEFAULT_RXD;

	/* set default work limits */
	wx->tx_work_limit = TXGBE_DEFAULT_TX_WORK;
	wx->rx_work_limit = TXGBE_DEFAULT_RX_WORK;

	return 0;
}

/**
 * txgbe_open - Called when a network interface is made active
 * @netdev: network interface device structure
 *
 * Returns 0 on success, negative value on failure
 *
 * The open entry point is called when a network interface is made
 * active by the system (IFF_UP).
 **/
static int txgbe_open(struct net_device *netdev)
{
	struct wx *wx = netdev_priv(netdev);
	int err;

	err = wx_setup_resources(wx);
	if (err)
		goto err_reset;

	wx_configure(wx);

	err = txgbe_request_irq(wx);
	if (err)
		goto err_free_isb;

	/* Notify the stack of the actual queue counts. */
	err = netif_set_real_num_tx_queues(netdev, wx->num_tx_queues);
	if (err)
		goto err_free_irq;

	err = netif_set_real_num_rx_queues(netdev, wx->num_rx_queues);
	if (err)
		goto err_free_irq;

	txgbe_up_complete(wx);

	return 0;

err_free_irq:
	wx_free_irq(wx);
err_free_isb:
	wx_free_isb_resources(wx);
err_reset:
	txgbe_reset(wx);

	return err;
}

/**
 * txgbe_close_suspend - actions necessary to both suspend and close flows
 * @wx: the private wx struct
 *
 * This function should contain the necessary work common to both suspending
 * and closing of the device.
 */
static void txgbe_close_suspend(struct wx *wx)
{
	txgbe_disable_device(wx);
	wx_free_resources(wx);
}

/**
 * txgbe_close - Disables a network interface
 * @netdev: network interface device structure
 *
 * Returns 0, this is not allowed to fail
 *
 * The close entry point is called when an interface is de-activated
 * by the OS.  The hardware is still under the drivers control, but
 * needs to be disabled.  A global MAC reset is issued to stop the
 * hardware, and all transmit and receive resources are freed.
 **/
static int txgbe_close(struct net_device *netdev)
{
	struct wx *wx = netdev_priv(netdev);

	txgbe_down(wx);
	wx_free_irq(wx);
	wx_free_resources(wx);
	wx_control_hw(wx, false);

	return 0;
}

static void txgbe_dev_shutdown(struct pci_dev *pdev, bool *enable_wake)
{
	struct wx *wx = pci_get_drvdata(pdev);
	struct net_device *netdev;

	netdev = wx->netdev;
	netif_device_detach(netdev);

	rtnl_lock();
	if (netif_running(netdev))
		txgbe_close_suspend(wx);
	rtnl_unlock();

	wx_control_hw(wx, false);

	pci_disable_device(pdev);
}

static void txgbe_shutdown(struct pci_dev *pdev)
{
	bool wake;

	txgbe_dev_shutdown(pdev, &wake);

	if (system_state == SYSTEM_POWER_OFF) {
		pci_wake_from_d3(pdev, wake);
		pci_set_power_state(pdev, PCI_D3hot);
	}
}

static const struct net_device_ops txgbe_netdev_ops = {
	.ndo_open               = txgbe_open,
	.ndo_stop               = txgbe_close,
	.ndo_change_mtu         = wx_change_mtu,
	.ndo_start_xmit         = wx_xmit_frame,
	.ndo_set_rx_mode        = wx_set_rx_mode,
	.ndo_validate_addr      = eth_validate_addr,
	.ndo_set_mac_address    = wx_set_mac,
	.ndo_get_stats64        = wx_get_stats64,
};

/**
 * txgbe_probe - Device Initialization Routine
 * @pdev: PCI device information struct
 * @ent: entry in txgbe_pci_tbl
 *
 * Returns 0 on success, negative on failure
 *
 * txgbe_probe initializes an adapter identified by a pci_dev structure.
 * The OS initialization, configuring of the wx private structure,
 * and a hardware reset occur.
 **/
static int txgbe_probe(struct pci_dev *pdev,
		       const struct pci_device_id __always_unused *ent)
{
	struct net_device *netdev;
	int err, expected_gts;
	struct wx *wx = NULL;

	u16 eeprom_verh = 0, eeprom_verl = 0, offset = 0;
	u16 eeprom_cfg_blkh = 0, eeprom_cfg_blkl = 0;
	u16 build = 0, major = 0, patch = 0;
	u8 part_str[TXGBE_PBANUM_LENGTH];
	u32 etrack_id = 0;

	err = pci_enable_device_mem(pdev);
	if (err)
		return err;

	err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
	if (err) {
		dev_err(&pdev->dev,
			"No usable DMA configuration, aborting\n");
		goto err_pci_disable_dev;
	}

	err = pci_request_selected_regions(pdev,
					   pci_select_bars(pdev, IORESOURCE_MEM),
					   txgbe_driver_name);
	if (err) {
		dev_err(&pdev->dev,
			"pci_request_selected_regions failed 0x%x\n", err);
		goto err_pci_disable_dev;
	}

	pci_set_master(pdev);

	netdev = devm_alloc_etherdev_mqs(&pdev->dev,
					 sizeof(struct wx),
					 TXGBE_MAX_TX_QUEUES,
					 TXGBE_MAX_RX_QUEUES);
	if (!netdev) {
		err = -ENOMEM;
		goto err_pci_release_regions;
	}

	SET_NETDEV_DEV(netdev, &pdev->dev);

	wx = netdev_priv(netdev);
	wx->netdev = netdev;
	wx->pdev = pdev;

	wx->msg_enable = (1 << DEFAULT_DEBUG_LEVEL_SHIFT) - 1;

	wx->hw_addr = devm_ioremap(&pdev->dev,
				   pci_resource_start(pdev, 0),
				   pci_resource_len(pdev, 0));
	if (!wx->hw_addr) {
		err = -EIO;
		goto err_pci_release_regions;
	}

	wx->driver_name = txgbe_driver_name;
	txgbe_set_ethtool_ops(netdev);
	netdev->netdev_ops = &txgbe_netdev_ops;

	/* setup the private structure */
	err = txgbe_sw_init(wx);
	if (err)
		goto err_free_mac_table;

	/* check if flash load is done after hw power up */
	err = wx_check_flash_load(wx, TXGBE_SPI_ILDR_STATUS_PERST);
	if (err)
		goto err_free_mac_table;
	err = wx_check_flash_load(wx, TXGBE_SPI_ILDR_STATUS_PWRRST);
	if (err)
		goto err_free_mac_table;

	err = wx_mng_present(wx);
	if (err) {
		dev_err(&pdev->dev, "Management capability is not present\n");
		goto err_free_mac_table;
	}

	err = txgbe_reset_hw(wx);
	if (err) {
		dev_err(&pdev->dev, "HW Init failed: %d\n", err);
		goto err_free_mac_table;
	}

	netdev->features |= NETIF_F_HIGHDMA;
	netdev->features = NETIF_F_SG;

	/* copy netdev features into list of user selectable features */
	netdev->hw_features |= netdev->features | NETIF_F_RXALL;

	netdev->priv_flags |= IFF_UNICAST_FLT;
	netdev->priv_flags |= IFF_SUPP_NOFCS;

	netdev->min_mtu = ETH_MIN_MTU;
	netdev->max_mtu = WX_MAX_JUMBO_FRAME_SIZE -
			  (ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN);

	/* make sure the EEPROM is good */
	err = txgbe_validate_eeprom_checksum(wx, NULL);
	if (err != 0) {
		dev_err(&pdev->dev, "The EEPROM Checksum Is Not Valid\n");
		wr32(wx, WX_MIS_RST, WX_MIS_RST_SW_RST);
		err = -EIO;
		goto err_free_mac_table;
	}

	eth_hw_addr_set(netdev, wx->mac.perm_addr);
	wx_mac_set_default_filter(wx, wx->mac.perm_addr);

	err = wx_init_interrupt_scheme(wx);
	if (err)
		goto err_free_mac_table;

	/* Save off EEPROM version number and Option Rom version which
	 * together make a unique identify for the eeprom
	 */
	wx_read_ee_hostif(wx,
			  wx->eeprom.sw_region_offset + TXGBE_EEPROM_VERSION_H,
			  &eeprom_verh);
	wx_read_ee_hostif(wx,
			  wx->eeprom.sw_region_offset + TXGBE_EEPROM_VERSION_L,
			  &eeprom_verl);
	etrack_id = (eeprom_verh << 16) | eeprom_verl;

	wx_read_ee_hostif(wx,
			  wx->eeprom.sw_region_offset + TXGBE_ISCSI_BOOT_CONFIG,
			  &offset);

	/* Make sure offset to SCSI block is valid */
	if (!(offset == 0x0) && !(offset == 0xffff)) {
		wx_read_ee_hostif(wx, offset + 0x84, &eeprom_cfg_blkh);
		wx_read_ee_hostif(wx, offset + 0x83, &eeprom_cfg_blkl);

		/* Only display Option Rom if exist */
		if (eeprom_cfg_blkl && eeprom_cfg_blkh) {
			major = eeprom_cfg_blkl >> 8;
			build = (eeprom_cfg_blkl << 8) | (eeprom_cfg_blkh >> 8);
			patch = eeprom_cfg_blkh & 0x00ff;

			snprintf(wx->eeprom_id, sizeof(wx->eeprom_id),
				 "0x%08x, %d.%d.%d", etrack_id, major, build,
				 patch);
		} else {
			snprintf(wx->eeprom_id, sizeof(wx->eeprom_id),
				 "0x%08x", etrack_id);
		}
	} else {
		snprintf(wx->eeprom_id, sizeof(wx->eeprom_id),
			 "0x%08x", etrack_id);
	}

	err = register_netdev(netdev);
	if (err)
		goto err_release_hw;

	pci_set_drvdata(pdev, wx);

	netif_tx_stop_all_queues(netdev);

	/* calculate the expected PCIe bandwidth required for optimal
	 * performance. Note that some older parts will never have enough
	 * bandwidth due to being older generation PCIe parts. We clamp these
	 * parts to ensure that no warning is displayed, as this could confuse
	 * users otherwise.
	 */
	expected_gts = txgbe_enumerate_functions(wx) * 10;

	/* don't check link if we failed to enumerate functions */
	if (expected_gts > 0)
		txgbe_check_minimum_link(wx);
	else
		dev_warn(&pdev->dev, "Failed to enumerate PF devices.\n");

	/* First try to read PBA as a string */
	err = txgbe_read_pba_string(wx, part_str, TXGBE_PBANUM_LENGTH);
	if (err)
		strncpy(part_str, "Unknown", TXGBE_PBANUM_LENGTH);

	netif_info(wx, probe, netdev, "%pM\n", netdev->dev_addr);

	return 0;

err_release_hw:
	wx_clear_interrupt_scheme(wx);
	wx_control_hw(wx, false);
err_free_mac_table:
	kfree(wx->mac_table);
err_pci_release_regions:
	pci_release_selected_regions(pdev,
				     pci_select_bars(pdev, IORESOURCE_MEM));
err_pci_disable_dev:
	pci_disable_device(pdev);
	return err;
}

/**
 * txgbe_remove - Device Removal Routine
 * @pdev: PCI device information struct
 *
 * txgbe_remove is called by the PCI subsystem to alert the driver
 * that it should release a PCI device.  The could be caused by a
 * Hot-Plug event, or because the driver is going to be removed from
 * memory.
 **/
static void txgbe_remove(struct pci_dev *pdev)
{
	struct wx *wx = pci_get_drvdata(pdev);
	struct net_device *netdev;

	netdev = wx->netdev;
	unregister_netdev(netdev);

	pci_release_selected_regions(pdev,
				     pci_select_bars(pdev, IORESOURCE_MEM));

	kfree(wx->mac_table);
	wx_clear_interrupt_scheme(wx);

	pci_disable_device(pdev);
}

static struct pci_driver txgbe_driver = {
	.name     = txgbe_driver_name,
	.id_table = txgbe_pci_tbl,
	.probe    = txgbe_probe,
	.remove   = txgbe_remove,
	.shutdown = txgbe_shutdown,
};

module_pci_driver(txgbe_driver);

MODULE_DEVICE_TABLE(pci, txgbe_pci_tbl);
MODULE_AUTHOR("Beijing WangXun Technology Co., Ltd, <software@trustnetic.com>");
MODULE_DESCRIPTION("WangXun(R) 10 Gigabit PCI Express Network Driver");
MODULE_LICENSE("GPL");