i40evf_main.c 66 KB
Newer Older
Greg Rose's avatar
Greg Rose committed
1
2
3
/*******************************************************************************
 *
 * Intel Ethernet Controller XL710 Family Linux Virtual Function Driver
4
 * Copyright(c) 2013 - 2014 Intel Corporation.
Greg Rose's avatar
Greg Rose committed
5
6
7
8
9
10
11
12
13
14
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
15
16
17
 * You should have received a copy of the GNU General Public License along
 * with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
Greg Rose's avatar
Greg Rose committed
18
19
20
21
22
23
24
25
26
27
28
29
30
 * The full GNU General Public License is included in this distribution in
 * the file called "COPYING".
 *
 * Contact Information:
 * e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 *
 ******************************************************************************/

#include "i40evf.h"
#include "i40e_prototype.h"
static int i40evf_setup_all_tx_resources(struct i40evf_adapter *adapter);
static int i40evf_setup_all_rx_resources(struct i40evf_adapter *adapter);
31
32
static void i40evf_free_all_tx_resources(struct i40evf_adapter *adapter);
static void i40evf_free_all_rx_resources(struct i40evf_adapter *adapter);
Greg Rose's avatar
Greg Rose committed
33
34
35
36
static int i40evf_close(struct net_device *netdev);

char i40evf_driver_name[] = "i40evf";
static const char i40evf_driver_string[] =
37
	"Intel(R) XL710/X710 Virtual Function Network Driver";
Greg Rose's avatar
Greg Rose committed
38

39
#define DRV_VERSION "1.0.6"
Greg Rose's avatar
Greg Rose committed
40
41
const char i40evf_driver_version[] = DRV_VERSION;
static const char i40evf_copyright[] =
42
	"Copyright (c) 2013 - 2014 Intel Corporation.";
Greg Rose's avatar
Greg Rose committed
43
44
45
46
47
48
49
50
51

/* i40evf_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) }
 */
52
static const struct pci_device_id i40evf_pci_tbl[] = {
53
	{PCI_VDEVICE(INTEL, I40E_DEV_ID_VF), 0},
Greg Rose's avatar
Greg Rose committed
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
	/* required last entry */
	{0, }
};

MODULE_DEVICE_TABLE(pci, i40evf_pci_tbl);

MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
MODULE_DESCRIPTION("Intel(R) XL710 X710 Virtual Function Network Driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);

/**
 * i40evf_allocate_dma_mem_d - OS specific memory alloc for shared code
 * @hw:   pointer to the HW structure
 * @mem:  ptr to mem struct to fill out
 * @size: size of memory requested
 * @alignment: what to align the allocation to
 **/
i40e_status i40evf_allocate_dma_mem_d(struct i40e_hw *hw,
				      struct i40e_dma_mem *mem,
				      u64 size, u32 alignment)
{
	struct i40evf_adapter *adapter = (struct i40evf_adapter *)hw->back;

	if (!mem)
		return I40E_ERR_PARAM;

	mem->size = ALIGN(size, alignment);
	mem->va = dma_alloc_coherent(&adapter->pdev->dev, mem->size,
				     (dma_addr_t *)&mem->pa, GFP_KERNEL);
	if (mem->va)
		return 0;
	else
		return I40E_ERR_NO_MEMORY;
}

/**
 * i40evf_free_dma_mem_d - OS specific memory free for shared code
 * @hw:   pointer to the HW structure
 * @mem:  ptr to mem struct to free
 **/
i40e_status i40evf_free_dma_mem_d(struct i40e_hw *hw, struct i40e_dma_mem *mem)
{
	struct i40evf_adapter *adapter = (struct i40evf_adapter *)hw->back;

	if (!mem || !mem->va)
		return I40E_ERR_PARAM;
	dma_free_coherent(&adapter->pdev->dev, mem->size,
			  mem->va, (dma_addr_t)mem->pa);
	return 0;
}

/**
 * i40evf_allocate_virt_mem_d - OS specific memory alloc for shared code
 * @hw:   pointer to the HW structure
 * @mem:  ptr to mem struct to fill out
 * @size: size of memory requested
 **/
i40e_status i40evf_allocate_virt_mem_d(struct i40e_hw *hw,
				       struct i40e_virt_mem *mem, u32 size)
{
	if (!mem)
		return I40E_ERR_PARAM;

	mem->size = size;
	mem->va = kzalloc(size, GFP_KERNEL);

	if (mem->va)
		return 0;
	else
		return I40E_ERR_NO_MEMORY;
}

/**
 * i40evf_free_virt_mem_d - OS specific memory free for shared code
 * @hw:   pointer to the HW structure
 * @mem:  ptr to mem struct to free
 **/
i40e_status i40evf_free_virt_mem_d(struct i40e_hw *hw,
				   struct i40e_virt_mem *mem)
{
	if (!mem)
		return I40E_ERR_PARAM;

	/* it's ok to kfree a NULL pointer */
	kfree(mem->va);

	return 0;
}

/**
 * i40evf_debug_d - OS dependent version of debug printing
 * @hw:  pointer to the HW structure
 * @mask: debug level mask
 * @fmt_str: printf-type format description
 **/
void i40evf_debug_d(void *hw, u32 mask, char *fmt_str, ...)
{
	char buf[512];
	va_list argptr;

	if (!(mask & ((struct i40e_hw *)hw)->debug_mask))
		return;

	va_start(argptr, fmt_str);
	vsnprintf(buf, sizeof(buf), fmt_str, argptr);
	va_end(argptr);

	/* the debug string is already formatted with a newline */
	pr_info("%s", buf);
}

/**
 * i40evf_tx_timeout - Respond to a Tx Hang
 * @netdev: network interface device structure
 **/
static void i40evf_tx_timeout(struct net_device *netdev)
{
	struct i40evf_adapter *adapter = netdev_priv(netdev);

	adapter->tx_timeout_count++;
175
	if (!(adapter->flags & I40EVF_FLAG_RESET_PENDING)) {
176
		adapter->flags |= I40EVF_FLAG_RESET_NEEDED;
177
178
		schedule_work(&adapter->reset_task);
	}
Greg Rose's avatar
Greg Rose committed
179
180
181
182
183
184
185
186
187
}

/**
 * i40evf_misc_irq_disable - Mask off interrupt generation on the NIC
 * @adapter: board private structure
 **/
static void i40evf_misc_irq_disable(struct i40evf_adapter *adapter)
{
	struct i40e_hw *hw = &adapter->hw;
Mitch Williams's avatar
Mitch Williams committed
188

Greg Rose's avatar
Greg Rose committed
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
	wr32(hw, I40E_VFINT_DYN_CTL01, 0);

	/* read flush */
	rd32(hw, I40E_VFGEN_RSTAT);

	synchronize_irq(adapter->msix_entries[0].vector);
}

/**
 * i40evf_misc_irq_enable - Enable default interrupt generation settings
 * @adapter: board private structure
 **/
static void i40evf_misc_irq_enable(struct i40evf_adapter *adapter)
{
	struct i40e_hw *hw = &adapter->hw;
Mitch Williams's avatar
Mitch Williams committed
204

Greg Rose's avatar
Greg Rose committed
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
	wr32(hw, I40E_VFINT_DYN_CTL01, I40E_VFINT_DYN_CTL01_INTENA_MASK |
				       I40E_VFINT_DYN_CTL01_ITR_INDX_MASK);
	wr32(hw, I40E_VFINT_ICR0_ENA1, I40E_VFINT_ICR0_ENA_ADMINQ_MASK);

	/* read flush */
	rd32(hw, I40E_VFGEN_RSTAT);
}

/**
 * i40evf_irq_disable - Mask off interrupt generation on the NIC
 * @adapter: board private structure
 **/
static void i40evf_irq_disable(struct i40evf_adapter *adapter)
{
	int i;
	struct i40e_hw *hw = &adapter->hw;

222
223
224
	if (!adapter->msix_entries)
		return;

Greg Rose's avatar
Greg Rose committed
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
	for (i = 1; i < adapter->num_msix_vectors; i++) {
		wr32(hw, I40E_VFINT_DYN_CTLN1(i - 1), 0);
		synchronize_irq(adapter->msix_entries[i].vector);
	}
	/* read flush */
	rd32(hw, I40E_VFGEN_RSTAT);
}

/**
 * i40evf_irq_enable_queues - Enable interrupt for specified queues
 * @adapter: board private structure
 * @mask: bitmap of queues to enable
 **/
void i40evf_irq_enable_queues(struct i40evf_adapter *adapter, u32 mask)
{
	struct i40e_hw *hw = &adapter->hw;
	int i;

	for (i = 1; i < adapter->num_msix_vectors; i++) {
		if (mask & (1 << (i - 1))) {
			wr32(hw, I40E_VFINT_DYN_CTLN1(i - 1),
			     I40E_VFINT_DYN_CTLN1_INTENA_MASK |
			     I40E_VFINT_DYN_CTLN_CLEARPBA_MASK);
		}
	}
}

/**
 * i40evf_fire_sw_int - Generate SW interrupt for specified vectors
 * @adapter: board private structure
 * @mask: bitmap of vectors to trigger
 **/
Mitch Williams's avatar
Mitch Williams committed
257
static void i40evf_fire_sw_int(struct i40evf_adapter *adapter, u32 mask)
Greg Rose's avatar
Greg Rose committed
258
259
260
261
262
{
	struct i40e_hw *hw = &adapter->hw;
	int i;
	uint32_t dyn_ctl;

263
264
265
266
267
268
	if (mask & 1) {
		dyn_ctl = rd32(hw, I40E_VFINT_DYN_CTL01);
		dyn_ctl |= I40E_VFINT_DYN_CTLN_SWINT_TRIG_MASK |
			   I40E_VFINT_DYN_CTLN_CLEARPBA_MASK;
		wr32(hw, I40E_VFINT_DYN_CTL01, dyn_ctl);
	}
Greg Rose's avatar
Greg Rose committed
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
	for (i = 1; i < adapter->num_msix_vectors; i++) {
		if (mask & (1 << i)) {
			dyn_ctl = rd32(hw, I40E_VFINT_DYN_CTLN1(i - 1));
			dyn_ctl |= I40E_VFINT_DYN_CTLN_SWINT_TRIG_MASK |
				   I40E_VFINT_DYN_CTLN_CLEARPBA_MASK;
			wr32(hw, I40E_VFINT_DYN_CTLN1(i - 1), dyn_ctl);
		}
	}
}

/**
 * i40evf_irq_enable - Enable default interrupt generation settings
 * @adapter: board private structure
 **/
void i40evf_irq_enable(struct i40evf_adapter *adapter, bool flush)
{
	struct i40e_hw *hw = &adapter->hw;

287
	i40evf_misc_irq_enable(adapter);
Greg Rose's avatar
Greg Rose committed
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
	i40evf_irq_enable_queues(adapter, ~0);

	if (flush)
		rd32(hw, I40E_VFGEN_RSTAT);
}

/**
 * i40evf_msix_aq - Interrupt handler for vector 0
 * @irq: interrupt number
 * @data: pointer to netdev
 **/
static irqreturn_t i40evf_msix_aq(int irq, void *data)
{
	struct net_device *netdev = data;
	struct i40evf_adapter *adapter = netdev_priv(netdev);
	struct i40e_hw *hw = &adapter->hw;
	u32 val;
	u32 ena_mask;

	/* handle non-queue interrupts */
	val = rd32(hw, I40E_VFINT_ICR01);
	ena_mask = rd32(hw, I40E_VFINT_ICR0_ENA1);


	val = rd32(hw, I40E_VFINT_DYN_CTL01);
	val = val | I40E_PFINT_DYN_CTL0_CLEARPBA_MASK;
	wr32(hw, I40E_VFINT_DYN_CTL01, val);

	/* re-enable interrupt causes */
	wr32(hw, I40E_VFINT_ICR0_ENA1, ena_mask);
	wr32(hw, I40E_VFINT_DYN_CTL01, I40E_VFINT_DYN_CTL01_INTENA_MASK);

	/* schedule work on the private workqueue */
	schedule_work(&adapter->adminq_task);

	return IRQ_HANDLED;
}

/**
 * i40evf_msix_clean_rings - MSIX mode Interrupt Handler
 * @irq: interrupt number
 * @data: pointer to a q_vector
 **/
static irqreturn_t i40evf_msix_clean_rings(int irq, void *data)
{
	struct i40e_q_vector *q_vector = data;

	if (!q_vector->tx.ring && !q_vector->rx.ring)
		return IRQ_HANDLED;

	napi_schedule(&q_vector->napi);

	return IRQ_HANDLED;
}

/**
 * i40evf_map_vector_to_rxq - associate irqs with rx queues
 * @adapter: board private structure
 * @v_idx: interrupt number
 * @r_idx: queue number
 **/
static void
i40evf_map_vector_to_rxq(struct i40evf_adapter *adapter, int v_idx, int r_idx)
{
	struct i40e_q_vector *q_vector = adapter->q_vector[v_idx];
	struct i40e_ring *rx_ring = adapter->rx_rings[r_idx];

	rx_ring->q_vector = q_vector;
	rx_ring->next = q_vector->rx.ring;
	rx_ring->vsi = &adapter->vsi;
	q_vector->rx.ring = rx_ring;
	q_vector->rx.count++;
	q_vector->rx.latency_range = I40E_LOW_LATENCY;
}

/**
 * i40evf_map_vector_to_txq - associate irqs with tx queues
 * @adapter: board private structure
 * @v_idx: interrupt number
 * @t_idx: queue number
 **/
static void
i40evf_map_vector_to_txq(struct i40evf_adapter *adapter, int v_idx, int t_idx)
{
	struct i40e_q_vector *q_vector = adapter->q_vector[v_idx];
	struct i40e_ring *tx_ring = adapter->tx_rings[t_idx];

	tx_ring->q_vector = q_vector;
	tx_ring->next = q_vector->tx.ring;
	tx_ring->vsi = &adapter->vsi;
	q_vector->tx.ring = tx_ring;
	q_vector->tx.count++;
	q_vector->tx.latency_range = I40E_LOW_LATENCY;
	q_vector->num_ringpairs++;
	q_vector->ring_mask |= (1 << t_idx);
}

/**
 * i40evf_map_rings_to_vectors - Maps descriptor rings to vectors
 * @adapter: board private structure to initialize
 *
 * This function maps descriptor rings to the queue-specific vectors
 * we were allotted through the MSI-X enabling code.  Ideally, we'd have
 * one vector per ring/queue, but on a constrained vector budget, we
 * group the rings as "efficiently" as possible.  You would add new
 * mapping configurations in here.
 **/
static int i40evf_map_rings_to_vectors(struct i40evf_adapter *adapter)
{
	int q_vectors;
	int v_start = 0;
	int rxr_idx = 0, txr_idx = 0;
400
401
	int rxr_remaining = adapter->num_active_queues;
	int txr_remaining = adapter->num_active_queues;
Greg Rose's avatar
Greg Rose committed
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
	int i, j;
	int rqpv, tqpv;
	int err = 0;

	q_vectors = adapter->num_msix_vectors - NONQ_VECS;

	/* The ideal configuration...
	 * We have enough vectors to map one per queue.
	 */
	if (q_vectors == (rxr_remaining * 2)) {
		for (; rxr_idx < rxr_remaining; v_start++, rxr_idx++)
			i40evf_map_vector_to_rxq(adapter, v_start, rxr_idx);

		for (; txr_idx < txr_remaining; v_start++, txr_idx++)
			i40evf_map_vector_to_txq(adapter, v_start, txr_idx);
		goto out;
	}

	/* If we don't have enough vectors for a 1-to-1
	 * mapping, we'll have to group them so there are
	 * multiple queues per vector.
	 * Re-adjusting *qpv takes care of the remainder.
	 */
	for (i = v_start; i < q_vectors; i++) {
		rqpv = DIV_ROUND_UP(rxr_remaining, q_vectors - i);
		for (j = 0; j < rqpv; j++) {
			i40evf_map_vector_to_rxq(adapter, i, rxr_idx);
			rxr_idx++;
			rxr_remaining--;
		}
	}
	for (i = v_start; i < q_vectors; i++) {
		tqpv = DIV_ROUND_UP(txr_remaining, q_vectors - i);
		for (j = 0; j < tqpv; j++) {
			i40evf_map_vector_to_txq(adapter, i, txr_idx);
			txr_idx++;
			txr_remaining--;
		}
	}

out:
	adapter->aq_required |= I40EVF_FLAG_AQ_MAP_VECTORS;

	return err;
}

/**
 * i40evf_request_traffic_irqs - Initialize MSI-X interrupts
 * @adapter: board private structure
 *
 * Allocates MSI-X vectors for tx and rx handling, and requests
 * interrupts from the kernel.
 **/
static int
i40evf_request_traffic_irqs(struct i40evf_adapter *adapter, char *basename)
{
	int vector, err, q_vectors;
	int rx_int_idx = 0, tx_int_idx = 0;

	i40evf_irq_disable(adapter);
	/* Decrement for Other and TCP Timer vectors */
	q_vectors = adapter->num_msix_vectors - NONQ_VECS;

	for (vector = 0; vector < q_vectors; vector++) {
		struct i40e_q_vector *q_vector = adapter->q_vector[vector];

		if (q_vector->tx.ring && q_vector->rx.ring) {
			snprintf(q_vector->name, sizeof(q_vector->name) - 1,
				 "i40evf-%s-%s-%d", basename,
				 "TxRx", rx_int_idx++);
			tx_int_idx++;
		} else if (q_vector->rx.ring) {
			snprintf(q_vector->name, sizeof(q_vector->name) - 1,
				 "i40evf-%s-%s-%d", basename,
				 "rx", rx_int_idx++);
		} else if (q_vector->tx.ring) {
			snprintf(q_vector->name, sizeof(q_vector->name) - 1,
				 "i40evf-%s-%s-%d", basename,
				 "tx", tx_int_idx++);
		} else {
			/* skip this unused q_vector */
			continue;
		}
		err = request_irq(
			adapter->msix_entries[vector + NONQ_VECS].vector,
			i40evf_msix_clean_rings,
			0,
			q_vector->name,
			q_vector);
		if (err) {
			dev_info(&adapter->pdev->dev,
				 "%s: request_irq failed, error: %d\n",
				__func__, err);
			goto free_queue_irqs;
		}
		/* assign the mask for this irq */
		irq_set_affinity_hint(
			adapter->msix_entries[vector + NONQ_VECS].vector,
			q_vector->affinity_mask);
	}

	return 0;

free_queue_irqs:
	while (vector) {
		vector--;
		irq_set_affinity_hint(
			adapter->msix_entries[vector + NONQ_VECS].vector,
			NULL);
		free_irq(adapter->msix_entries[vector + NONQ_VECS].vector,
			 adapter->q_vector[vector]);
	}
	return err;
}

/**
 * i40evf_request_misc_irq - Initialize MSI-X interrupts
 * @adapter: board private structure
 *
 * Allocates MSI-X vector 0 and requests interrupts from the kernel. This
 * vector is only for the admin queue, and stays active even when the netdev
 * is closed.
 **/
static int i40evf_request_misc_irq(struct i40evf_adapter *adapter)
{
	struct net_device *netdev = adapter->netdev;
	int err;

530
531
	snprintf(adapter->misc_vector_name,
		 sizeof(adapter->misc_vector_name) - 1, "i40evf:mbx");
Greg Rose's avatar
Greg Rose committed
532
	err = request_irq(adapter->msix_entries[0].vector,
533
534
			  &i40evf_msix_aq, 0,
			  adapter->misc_vector_name, netdev);
Greg Rose's avatar
Greg Rose committed
535
536
	if (err) {
		dev_err(&adapter->pdev->dev,
537
538
			"request_irq for %s failed: %d\n",
			adapter->misc_vector_name, err);
Greg Rose's avatar
Greg Rose committed
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
		free_irq(adapter->msix_entries[0].vector, netdev);
	}
	return err;
}

/**
 * i40evf_free_traffic_irqs - Free MSI-X interrupts
 * @adapter: board private structure
 *
 * Frees all MSI-X vectors other than 0.
 **/
static void i40evf_free_traffic_irqs(struct i40evf_adapter *adapter)
{
	int i;
	int q_vectors;
Mitch Williams's avatar
Mitch Williams committed
554

Greg Rose's avatar
Greg Rose committed
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
	q_vectors = adapter->num_msix_vectors - NONQ_VECS;

	for (i = 0; i < q_vectors; i++) {
		irq_set_affinity_hint(adapter->msix_entries[i+1].vector,
				      NULL);
		free_irq(adapter->msix_entries[i+1].vector,
			 adapter->q_vector[i]);
	}
}

/**
 * i40evf_free_misc_irq - Free MSI-X miscellaneous vector
 * @adapter: board private structure
 *
 * Frees MSI-X vector 0.
 **/
static void i40evf_free_misc_irq(struct i40evf_adapter *adapter)
{
	struct net_device *netdev = adapter->netdev;

	free_irq(adapter->msix_entries[0].vector, netdev);
}

/**
 * i40evf_configure_tx - Configure Transmit Unit after Reset
 * @adapter: board private structure
 *
 * Configure the Tx unit of the MAC after a reset.
 **/
static void i40evf_configure_tx(struct i40evf_adapter *adapter)
{
	struct i40e_hw *hw = &adapter->hw;
	int i;
Mitch Williams's avatar
Mitch Williams committed
588

589
	for (i = 0; i < adapter->num_active_queues; i++)
Greg Rose's avatar
Greg Rose committed
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
		adapter->tx_rings[i]->tail = hw->hw_addr + I40E_QTX_TAIL1(i);
}

/**
 * i40evf_configure_rx - Configure Receive Unit after Reset
 * @adapter: board private structure
 *
 * Configure the Rx unit of the MAC after a reset.
 **/
static void i40evf_configure_rx(struct i40evf_adapter *adapter)
{
	struct i40e_hw *hw = &adapter->hw;
	struct net_device *netdev = adapter->netdev;
	int max_frame = netdev->mtu + ETH_HLEN + ETH_FCS_LEN;
	int i;
	int rx_buf_len;


	adapter->flags &= ~I40EVF_FLAG_RX_PS_CAPABLE;
	adapter->flags |= I40EVF_FLAG_RX_1BUF_CAPABLE;

	/* Decide whether to use packet split mode or not */
	if (netdev->mtu > ETH_DATA_LEN) {
		if (adapter->flags & I40EVF_FLAG_RX_PS_CAPABLE)
			adapter->flags |= I40EVF_FLAG_RX_PS_ENABLED;
		else
			adapter->flags &= ~I40EVF_FLAG_RX_PS_ENABLED;
	} else {
		if (adapter->flags & I40EVF_FLAG_RX_1BUF_CAPABLE)
			adapter->flags &= ~I40EVF_FLAG_RX_PS_ENABLED;
		else
			adapter->flags |= I40EVF_FLAG_RX_PS_ENABLED;
	}

	/* Set the RX buffer length according to the mode */
	if (adapter->flags & I40EVF_FLAG_RX_PS_ENABLED) {
		rx_buf_len = I40E_RX_HDR_SIZE;
	} else {
		if (netdev->mtu <= ETH_DATA_LEN)
			rx_buf_len = I40EVF_RXBUFFER_2048;
		else
			rx_buf_len = ALIGN(max_frame, 1024);
	}

634
	for (i = 0; i < adapter->num_active_queues; i++) {
Greg Rose's avatar
Greg Rose committed
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
		adapter->rx_rings[i]->tail = hw->hw_addr + I40E_QRX_TAIL1(i);
		adapter->rx_rings[i]->rx_buf_len = rx_buf_len;
	}
}

/**
 * i40evf_find_vlan - Search filter list for specific vlan filter
 * @adapter: board private structure
 * @vlan: vlan tag
 *
 * Returns ptr to the filter object or NULL
 **/
static struct
i40evf_vlan_filter *i40evf_find_vlan(struct i40evf_adapter *adapter, u16 vlan)
{
	struct i40evf_vlan_filter *f;

	list_for_each_entry(f, &adapter->vlan_filter_list, list) {
		if (vlan == f->vlan)
			return f;
	}
	return NULL;
}

/**
 * i40evf_add_vlan - Add a vlan filter to the list
 * @adapter: board private structure
 * @vlan: VLAN tag
 *
 * Returns ptr to the filter object or NULL when no memory available.
 **/
static struct
i40evf_vlan_filter *i40evf_add_vlan(struct i40evf_adapter *adapter, u16 vlan)
{
	struct i40evf_vlan_filter *f;

	f = i40evf_find_vlan(adapter, vlan);
672
	if (!f) {
Greg Rose's avatar
Greg Rose committed
673
		f = kzalloc(sizeof(*f), GFP_ATOMIC);
674
		if (!f)
Greg Rose's avatar
Greg Rose committed
675
			return NULL;
676

Greg Rose's avatar
Greg Rose committed
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
		f->vlan = vlan;

		INIT_LIST_HEAD(&f->list);
		list_add(&f->list, &adapter->vlan_filter_list);
		f->add = true;
		adapter->aq_required |= I40EVF_FLAG_AQ_ADD_VLAN_FILTER;
	}

	return f;
}

/**
 * i40evf_del_vlan - Remove a vlan filter from the list
 * @adapter: board private structure
 * @vlan: VLAN tag
 **/
static void i40evf_del_vlan(struct i40evf_adapter *adapter, u16 vlan)
{
	struct i40evf_vlan_filter *f;

	f = i40evf_find_vlan(adapter, vlan);
	if (f) {
		f->remove = true;
		adapter->aq_required |= I40EVF_FLAG_AQ_DEL_VLAN_FILTER;
	}
}

/**
 * i40evf_vlan_rx_add_vid - Add a VLAN filter to a device
 * @netdev: network device struct
 * @vid: VLAN tag
 **/
static int i40evf_vlan_rx_add_vid(struct net_device *netdev,
Mitch Williams's avatar
Mitch Williams committed
710
				  __always_unused __be16 proto, u16 vid)
Greg Rose's avatar
Greg Rose committed
711
712
713
714
715
716
717
718
719
720
721
722
723
724
{
	struct i40evf_adapter *adapter = netdev_priv(netdev);

	if (i40evf_add_vlan(adapter, vid) == NULL)
		return -ENOMEM;
	return 0;
}

/**
 * i40evf_vlan_rx_kill_vid - Remove a VLAN filter from a device
 * @netdev: network device struct
 * @vid: VLAN tag
 **/
static int i40evf_vlan_rx_kill_vid(struct net_device *netdev,
Mitch Williams's avatar
Mitch Williams committed
725
				   __always_unused __be16 proto, u16 vid)
Greg Rose's avatar
Greg Rose committed
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
{
	struct i40evf_adapter *adapter = netdev_priv(netdev);

	i40evf_del_vlan(adapter, vid);
	return 0;
}

/**
 * i40evf_find_filter - Search filter list for specific mac filter
 * @adapter: board private structure
 * @macaddr: the MAC address
 *
 * Returns ptr to the filter object or NULL
 **/
static struct
i40evf_mac_filter *i40evf_find_filter(struct i40evf_adapter *adapter,
				      u8 *macaddr)
{
	struct i40evf_mac_filter *f;

	if (!macaddr)
		return NULL;

	list_for_each_entry(f, &adapter->mac_filter_list, list) {
		if (ether_addr_equal(macaddr, f->macaddr))
			return f;
	}
	return NULL;
}

/**
 * i40e_add_filter - Add a mac filter to the filter list
 * @adapter: board private structure
 * @macaddr: the MAC address
 *
 * Returns ptr to the filter object or NULL when no memory available.
 **/
static struct
i40evf_mac_filter *i40evf_add_filter(struct i40evf_adapter *adapter,
				     u8 *macaddr)
{
	struct i40evf_mac_filter *f;

	if (!macaddr)
		return NULL;

	while (test_and_set_bit(__I40EVF_IN_CRITICAL_TASK,
				&adapter->crit_section))
Mitch Williams's avatar
Mitch Williams committed
774
		udelay(1);
Greg Rose's avatar
Greg Rose committed
775
776

	f = i40evf_find_filter(adapter, macaddr);
777
	if (!f) {
Greg Rose's avatar
Greg Rose committed
778
		f = kzalloc(sizeof(*f), GFP_ATOMIC);
779
		if (!f) {
Greg Rose's avatar
Greg Rose committed
780
781
782
783
784
			clear_bit(__I40EVF_IN_CRITICAL_TASK,
				  &adapter->crit_section);
			return NULL;
		}

785
		ether_addr_copy(f->macaddr, macaddr);
Greg Rose's avatar
Greg Rose committed
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817

		list_add(&f->list, &adapter->mac_filter_list);
		f->add = true;
		adapter->aq_required |= I40EVF_FLAG_AQ_ADD_MAC_FILTER;
	}

	clear_bit(__I40EVF_IN_CRITICAL_TASK, &adapter->crit_section);
	return f;
}

/**
 * i40evf_set_mac - NDO callback to set port mac address
 * @netdev: network interface device structure
 * @p: pointer to an address structure
 *
 * Returns 0 on success, negative on failure
 **/
static int i40evf_set_mac(struct net_device *netdev, void *p)
{
	struct i40evf_adapter *adapter = netdev_priv(netdev);
	struct i40e_hw *hw = &adapter->hw;
	struct i40evf_mac_filter *f;
	struct sockaddr *addr = p;

	if (!is_valid_ether_addr(addr->sa_data))
		return -EADDRNOTAVAIL;

	if (ether_addr_equal(netdev->dev_addr, addr->sa_data))
		return 0;

	f = i40evf_add_filter(adapter, addr->sa_data);
	if (f) {
818
819
		ether_addr_copy(hw->mac.addr, addr->sa_data);
		ether_addr_copy(netdev->dev_addr, adapter->hw.mac.addr);
Greg Rose's avatar
Greg Rose committed
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
	}

	return (f == NULL) ? -ENOMEM : 0;
}

/**
 * i40evf_set_rx_mode - NDO callback to set the netdev filters
 * @netdev: network interface device structure
 **/
static void i40evf_set_rx_mode(struct net_device *netdev)
{
	struct i40evf_adapter *adapter = netdev_priv(netdev);
	struct i40evf_mac_filter *f, *ftmp;
	struct netdev_hw_addr *uca;
	struct netdev_hw_addr *mca;

	/* add addr if not already in the filter list */
	netdev_for_each_uc_addr(uca, netdev) {
		i40evf_add_filter(adapter, uca->addr);
	}
	netdev_for_each_mc_addr(mca, netdev) {
		i40evf_add_filter(adapter, mca->addr);
	}

	while (test_and_set_bit(__I40EVF_IN_CRITICAL_TASK,
				&adapter->crit_section))
Mitch Williams's avatar
Mitch Williams committed
846
		udelay(1);
Greg Rose's avatar
Greg Rose committed
847
848
849
850
	/* remove filter if not in netdev list */
	list_for_each_entry_safe(f, ftmp, &adapter->mac_filter_list, list) {
		bool found = false;

851
		if (is_multicast_ether_addr(f->macaddr)) {
Greg Rose's avatar
Greg Rose committed
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
			netdev_for_each_mc_addr(mca, netdev) {
				if (ether_addr_equal(mca->addr, f->macaddr)) {
					found = true;
					break;
				}
			}
		} else {
			netdev_for_each_uc_addr(uca, netdev) {
				if (ether_addr_equal(uca->addr, f->macaddr)) {
					found = true;
					break;
				}
			}
		}
		if (found) {
			f->remove = true;
			adapter->aq_required |= I40EVF_FLAG_AQ_DEL_MAC_FILTER;
		}
	}
	clear_bit(__I40EVF_IN_CRITICAL_TASK, &adapter->crit_section);
}

/**
 * i40evf_napi_enable_all - enable NAPI on all queue vectors
 * @adapter: board private structure
 **/
static void i40evf_napi_enable_all(struct i40evf_adapter *adapter)
{
	int q_idx;
	struct i40e_q_vector *q_vector;
	int q_vectors = adapter->num_msix_vectors - NONQ_VECS;

	for (q_idx = 0; q_idx < q_vectors; q_idx++) {
		struct napi_struct *napi;
Mitch Williams's avatar
Mitch Williams committed
886

Greg Rose's avatar
Greg Rose committed
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
		q_vector = adapter->q_vector[q_idx];
		napi = &q_vector->napi;
		napi_enable(napi);
	}
}

/**
 * i40evf_napi_disable_all - disable NAPI on all queue vectors
 * @adapter: board private structure
 **/
static void i40evf_napi_disable_all(struct i40evf_adapter *adapter)
{
	int q_idx;
	struct i40e_q_vector *q_vector;
	int q_vectors = adapter->num_msix_vectors - NONQ_VECS;

	for (q_idx = 0; q_idx < q_vectors; q_idx++) {
		q_vector = adapter->q_vector[q_idx];
		napi_disable(&q_vector->napi);
	}
}

/**
 * i40evf_configure - set up transmit and receive data structures
 * @adapter: board private structure
 **/
static void i40evf_configure(struct i40evf_adapter *adapter)
{
	struct net_device *netdev = adapter->netdev;
	int i;

	i40evf_set_rx_mode(netdev);

	i40evf_configure_tx(adapter);
	i40evf_configure_rx(adapter);
	adapter->aq_required |= I40EVF_FLAG_AQ_CONFIGURE_QUEUES;

924
	for (i = 0; i < adapter->num_active_queues; i++) {
Greg Rose's avatar
Greg Rose committed
925
		struct i40e_ring *ring = adapter->rx_rings[i];
Mitch Williams's avatar
Mitch Williams committed
926

Greg Rose's avatar
Greg Rose committed
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
		i40evf_alloc_rx_buffers(ring, ring->count);
		ring->next_to_use = ring->count - 1;
		writel(ring->next_to_use, ring->tail);
	}
}

/**
 * i40evf_up_complete - Finish the last steps of bringing up a connection
 * @adapter: board private structure
 **/
static int i40evf_up_complete(struct i40evf_adapter *adapter)
{
	adapter->state = __I40EVF_RUNNING;
	clear_bit(__I40E_DOWN, &adapter->vsi.state);

	i40evf_napi_enable_all(adapter);

	adapter->aq_required |= I40EVF_FLAG_AQ_ENABLE_QUEUES;
	mod_timer_pending(&adapter->watchdog_timer, jiffies + 1);
	return 0;
}

/**
 * i40e_down - Shutdown the connection processing
 * @adapter: board private structure
 **/
void i40evf_down(struct i40evf_adapter *adapter)
{
	struct net_device *netdev = adapter->netdev;
	struct i40evf_mac_filter *f;

Mitch Williams's avatar
Mitch Williams committed
958
959
960
	if (adapter->state == __I40EVF_DOWN)
		return;

961
962
963
964
965
966
	while (test_and_set_bit(__I40EVF_IN_CRITICAL_TASK,
				&adapter->crit_section))
		usleep_range(500, 1000);

	i40evf_irq_disable(adapter);

967
	/* remove all MAC filters */
Greg Rose's avatar
Greg Rose committed
968
969
970
	list_for_each_entry(f, &adapter->mac_filter_list, list) {
		f->remove = true;
	}
971
972
973
974
	/* remove all VLAN filters */
	list_for_each_entry(f, &adapter->vlan_filter_list, list) {
		f->remove = true;
	}
975
976
	if (!(adapter->flags & I40EVF_FLAG_PF_COMMS_FAILED) &&
	    adapter->state != __I40EVF_RESETTING) {
977
978
979
980
981
982
983
984
		/* cancel any current operation */
		adapter->current_op = I40E_VIRTCHNL_OP_UNKNOWN;
		adapter->aq_pending = 0;
		/* Schedule operations to close down the HW. Don't wait
		 * here for this to complete. The watchdog is still running
		 * and it will take care of this.
		 */
		adapter->aq_required = I40EVF_FLAG_AQ_DEL_MAC_FILTER;
985
		adapter->aq_required |= I40EVF_FLAG_AQ_DEL_VLAN_FILTER;
986
987
		adapter->aq_required |= I40EVF_FLAG_AQ_DISABLE_QUEUES;
	}
Greg Rose's avatar
Greg Rose committed
988
989
990
991
992
993
	netif_tx_disable(netdev);

	netif_tx_stop_all_queues(netdev);

	i40evf_napi_disable_all(adapter);

994
995
	msleep(20);

Greg Rose's avatar
Greg Rose committed
996
	netif_carrier_off(netdev);
997
	clear_bit(__I40EVF_IN_CRITICAL_TASK, &adapter->crit_section);
Greg Rose's avatar
Greg Rose committed
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
}

/**
 * i40evf_acquire_msix_vectors - Setup the MSIX capability
 * @adapter: board private structure
 * @vectors: number of vectors to request
 *
 * Work with the OS to set up the MSIX vectors needed.
 *
 * Returns 0 on success, negative on failure
 **/
static int
i40evf_acquire_msix_vectors(struct i40evf_adapter *adapter, int vectors)
{
	int err, vector_threshold;

	/* We'll want at least 3 (vector_threshold):
	 * 0) Other (Admin Queue and link, mostly)
	 * 1) TxQ[0] Cleanup
	 * 2) RxQ[0] Cleanup
	 */
	vector_threshold = MIN_MSIX_COUNT;

	/* The more we get, the more we will assign to Tx/Rx Cleanup
	 * for the separate queues...where Rx Cleanup >= Tx Cleanup.
	 * Right now, we simply care about how many we'll get; we'll
	 * set them up later while requesting irq's.
	 */
1026
1027
1028
	err = pci_enable_msix_range(adapter->pdev, adapter->msix_entries,
				    vector_threshold, vectors);
	if (err < 0) {
1029
		dev_err(&adapter->pdev->dev, "Unable to allocate MSI-X interrupts\n");
Greg Rose's avatar
Greg Rose committed
1030
1031
		kfree(adapter->msix_entries);
		adapter->msix_entries = NULL;
1032
		return err;
Greg Rose's avatar
Greg Rose committed
1033
	}
1034
1035
1036
1037
1038
1039
1040

	/* Adjust for only the vectors we'll use, which is minimum
	 * of max_msix_q_vectors + NONQ_VECS, or the number of
	 * vectors we were allocated.
	 */
	adapter->num_msix_vectors = err;
	return 0;
Greg Rose's avatar
Greg Rose committed
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
}

/**
 * i40evf_free_queues - Free memory for all rings
 * @adapter: board private structure to initialize
 *
 * Free all of the memory associated with queue pairs.
 **/
static void i40evf_free_queues(struct i40evf_adapter *adapter)
{
	int i;

	if (!adapter->vsi_res)
		return;
1055
	for (i = 0; i < adapter->num_active_queues; i++) {
Greg Rose's avatar
Greg Rose committed
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
		if (adapter->tx_rings[i])
			kfree_rcu(adapter->tx_rings[i], rcu);
		adapter->tx_rings[i] = NULL;
		adapter->rx_rings[i] = NULL;
	}
}

/**
 * i40evf_alloc_queues - Allocate memory for all rings
 * @adapter: board private structure to initialize
 *
 * We allocate one ring per queue at run-time since we don't know the
 * number of queues at compile-time.  The polling_netdev array is
 * intended for Multiqueue, but should work fine with a single queue.
 **/
static int i40evf_alloc_queues(struct i40evf_adapter *adapter)
{
	int i;

1075
	for (i = 0; i < adapter->num_active_queues; i++) {
Greg Rose's avatar
Greg Rose committed
1076
1077
1078
		struct i40e_ring *tx_ring;
		struct i40e_ring *rx_ring;

Mitch Williams's avatar
Mitch Williams committed
1079
		tx_ring = kzalloc(sizeof(*tx_ring) * 2, GFP_KERNEL);
Greg Rose's avatar
Greg Rose committed
1080
1081
1082
1083
1084
1085
		if (!tx_ring)
			goto err_out;

		tx_ring->queue_index = i;
		tx_ring->netdev = adapter->netdev;
		tx_ring->dev = &adapter->pdev->dev;
1086
		tx_ring->count = adapter->tx_desc_count;
Greg Rose's avatar
Greg Rose committed
1087
1088
1089
1090
1091
1092
		adapter->tx_rings[i] = tx_ring;

		rx_ring = &tx_ring[1];
		rx_ring->queue_index = i;
		rx_ring->netdev = adapter->netdev;
		rx_ring->dev = &adapter->pdev->dev;
1093
		rx_ring->count = adapter->rx_desc_count;
Greg Rose's avatar
Greg Rose committed
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
		adapter->rx_rings[i] = rx_ring;
	}

	return 0;

err_out:
	i40evf_free_queues(adapter);
	return -ENOMEM;
}

/**
 * i40evf_set_interrupt_capability - set MSI-X or FAIL if not supported
 * @adapter: board private structure to initialize
 *
 * Attempt to configure the interrupts using the best available
 * capabilities of the hardware and the kernel.
 **/
static int i40evf_set_interrupt_capability(struct i40evf_adapter *adapter)
{
	int vector, v_budget;
	int pairs = 0;
	int err = 0;

	if (!adapter->vsi_res) {
		err = -EIO;
		goto out;
	}
1121
	pairs = adapter->num_active_queues;
Greg Rose's avatar
Greg Rose committed
1122
1123
1124
1125
1126
1127

	/* It's easy to be greedy for MSI-X vectors, but it really
	 * doesn't do us much good if we have a lot more vectors
	 * than CPU's.  So let's be conservative and only ask for
	 * (roughly) twice the number of vectors as there are CPU's.
	 */
Mitch Williams's avatar
Mitch Williams committed
1128
1129
	v_budget = min_t(int, pairs, (int)(num_online_cpus() * 2)) + NONQ_VECS;
	v_budget = min_t(int, v_budget, (int)adapter->vf_res->max_vectors);
Greg Rose's avatar
Greg Rose committed
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162

	adapter->msix_entries = kcalloc(v_budget,
					sizeof(struct msix_entry), GFP_KERNEL);
	if (!adapter->msix_entries) {
		err = -ENOMEM;
		goto out;
	}

	for (vector = 0; vector < v_budget; vector++)
		adapter->msix_entries[vector].entry = vector;

	i40evf_acquire_msix_vectors(adapter, v_budget);

out:
	adapter->netdev->real_num_tx_queues = pairs;
	return err;
}

/**
 * i40evf_alloc_q_vectors - Allocate memory for interrupt vectors
 * @adapter: board private structure to initialize
 *
 * We allocate one q_vector per queue interrupt.  If allocation fails we
 * return -ENOMEM.
 **/
static int i40evf_alloc_q_vectors(struct i40evf_adapter *adapter)
{
	int q_idx, num_q_vectors;
	struct i40e_q_vector *q_vector;

	num_q_vectors = adapter->num_msix_vectors - NONQ_VECS;

	for (q_idx = 0; q_idx < num_q_vectors; q_idx++) {
Mitch Williams's avatar
Mitch Williams committed
1163
		q_vector = kzalloc(sizeof(*q_vector), GFP_KERNEL);
Greg Rose's avatar
Greg Rose committed
1164
1165
1166
1167
1168
1169
		if (!q_vector)
			goto err_out;
		q_vector->adapter = adapter;
		q_vector->vsi = &adapter->vsi;
		q_vector->v_idx = q_idx;
		netif_napi_add(adapter->netdev, &q_vector->napi,
Mitch Williams's avatar
Mitch Williams committed
1170
			       i40evf_napi_poll, NAPI_POLL_WEIGHT);
Greg Rose's avatar
Greg Rose committed
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
		adapter->q_vector[q_idx] = q_vector;
	}

	return 0;

err_out:
	while (q_idx) {
		q_idx--;
		q_vector = adapter->q_vector[q_idx];
		netif_napi_del(&q_vector->napi);
		kfree(q_vector);
		adapter->q_vector[q_idx] = NULL;
	}
	return -ENOMEM;
}

/**
 * i40evf_free_q_vectors - Free memory allocated for interrupt vectors
 * @adapter: board private structure to initialize
 *
 * This function frees the memory allocated to the q_vectors.  In addition if
 * NAPI is enabled it will delete any references to the NAPI struct prior
 * to freeing the q_vector.
 **/
static void i40evf_free_q_vectors(struct i40evf_adapter *adapter)
{
	int q_idx, num_q_vectors;
	int napi_vectors;

	num_q_vectors = adapter->num_msix_vectors - NONQ_VECS;
1201
	napi_vectors = adapter->num_active_queues;
Greg Rose's avatar
Greg Rose committed
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255

	for (q_idx = 0; q_idx < num_q_vectors; q_idx++) {
		struct i40e_q_vector *q_vector = adapter->q_vector[q_idx];

		adapter->q_vector[q_idx] = NULL;
		if (q_idx < napi_vectors)
			netif_napi_del(&q_vector->napi);
		kfree(q_vector);
	}
}

/**
 * i40evf_reset_interrupt_capability - Reset MSIX setup
 * @adapter: board private structure
 *
 **/
void i40evf_reset_interrupt_capability(struct i40evf_adapter *adapter)
{
	pci_disable_msix(adapter->pdev);
	kfree(adapter->msix_entries);
	adapter->msix_entries = NULL;
}

/**
 * i40evf_init_interrupt_scheme - Determine if MSIX is supported and init
 * @adapter: board private structure to initialize
 *
 **/
int i40evf_init_interrupt_scheme(struct i40evf_adapter *adapter)
{
	int err;

	err = i40evf_set_interrupt_capability(adapter);
	if (err) {
		dev_err(&adapter->pdev->dev,
			"Unable to setup interrupt capabilities\n");
		goto err_set_interrupt;
	}

	err = i40evf_alloc_q_vectors(adapter);
	if (err) {
		dev_err(&adapter->pdev->dev,
			"Unable to allocate memory for queue vectors\n");
		goto err_alloc_q_vectors;
	}

	err = i40evf_alloc_queues(adapter);
	if (err) {
		dev_err(&adapter->pdev->dev,
			"Unable to allocate memory for queues\n");
		goto err_alloc_queues;
	}

	dev_info(&adapter->pdev->dev, "Multiqueue %s: Queue pair count = %u",
Mitch Williams's avatar
Mitch Williams committed
1256
1257
		 (adapter->num_active_queues > 1) ? "Enabled" : "Disabled",
		 adapter->num_active_queues);
Greg Rose's avatar
Greg Rose committed
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274

	return 0;
err_alloc_queues:
	i40evf_free_q_vectors(adapter);
err_alloc_q_vectors:
	i40evf_reset_interrupt_capability(adapter);
err_set_interrupt:
	return err;
}

/**
 * i40evf_watchdog_timer - Periodic call-back timer
 * @data: pointer to adapter disguised as unsigned long
 **/
static void i40evf_watchdog_timer(unsigned long data)
{
	struct i40evf_adapter *adapter = (struct i40evf_adapter *)data;
Mitch Williams's avatar
Mitch Williams committed
1275

Greg Rose's avatar
Greg Rose committed
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
	schedule_work(&adapter->watchdog_task);
	/* timer will be rescheduled in watchdog task */
}

/**
 * i40evf_watchdog_task - Periodic call-back task
 * @work: pointer to work_struct
 **/
static void i40evf_watchdog_task(struct work_struct *work)
{
	struct i40evf_adapter *adapter = container_of(work,
Mitch Williams's avatar
Mitch Williams committed
1287
1288
						      struct i40evf_adapter,
						      watchdog_task);
Greg Rose's avatar
Greg Rose committed
1289
	struct i40e_hw *hw = &adapter->hw;
1290
	uint32_t rstat_val;
Greg Rose's avatar
Greg Rose committed
1291

1292
1293
1294
1295
	if (test_and_set_bit(__I40EVF_IN_CRITICAL_TASK, &adapter->crit_section))
		goto restart_watchdog;

	if (adapter->flags & I40EVF_FLAG_PF_COMMS_FAILED) {
1296
1297
1298
1299
		rstat_val = rd32(hw, I40E_VFGEN_RSTAT) &
			    I40E_VFGEN_RSTAT_VFR_STATE_MASK;
		if ((rstat_val == I40E_VFR_VFACTIVE) ||
		    (rstat_val == I40E_VFR_COMPLETED)) {
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
			/* A chance for redemption! */
			dev_err(&adapter->pdev->dev, "Hardware came out of reset. Attempting reinit.\n");
			adapter->state = __I40EVF_STARTUP;
			adapter->flags &= ~I40EVF_FLAG_PF_COMMS_FAILED;
			schedule_delayed_work(&adapter->init_task, 10);
			clear_bit(__I40EVF_IN_CRITICAL_TASK,
				  &adapter->crit_section);
			/* Don't reschedule the watchdog, since we've restarted
			 * the init task. When init_task contacts the PF and
			 * gets everything set up again, it'll restart the
			 * watchdog for us. Down, boy. Sit. Stay. Woof.
			 */
			return;
		}
		adapter->aq_pending = 0;
		adapter->aq_required = 0;
		adapter->current_op = I40E_VIRTCHNL_OP_UNKNOWN;
Greg Rose's avatar
Greg Rose committed
1317
		goto watchdog_done;
1318
	}
Greg Rose's avatar
Greg Rose committed
1319

1320
1321
	if ((adapter->state < __I40EVF_DOWN) ||
	    (adapter->flags & I40EVF_FLAG_RESET_PENDING))
Greg Rose's avatar
Greg Rose committed
1322
1323
		goto watchdog_done;

1324
	/* check for reset */
1325
	rstat_val = rd32(hw, I40E_VFGEN_RSTAT) &
Mitch Williams's avatar
Mitch Williams committed
1326
		    I40E_VFGEN_RSTAT_VFR_STATE_MASK;
1327
	if (!(adapter->flags & I40EVF_FLAG_RESET_PENDING) &&
1328
1329
	    (rstat_val != I40E_VFR_VFACTIVE) &&
	    (rstat_val != I40E_VFR_COMPLETED)) {
Greg Rose's avatar
Greg Rose committed
1330
		adapter->state = __I40EVF_RESETTING;
1331
		adapter->flags |= I40EVF_FLAG_RESET_PENDING;
1332
		dev_err(&adapter->pdev->dev, "Hardware reset detected\n");
Greg Rose's avatar
Greg Rose committed
1333
		schedule_work(&adapter->reset_task);
1334
1335
1336
		adapter->aq_pending = 0;
		adapter->aq_required = 0;
		adapter->current_op = I40E_VIRTCHNL_OP_UNKNOWN;
Greg Rose's avatar
Greg Rose committed
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
		goto watchdog_done;
	}

	/* Process admin queue tasks. After init, everything gets done
	 * here so we don't race on the admin queue.
	 */
	if (adapter->aq_pending)
		goto watchdog_done;

	if (adapter->aq_required & I40EVF_FLAG_AQ_MAP_VECTORS) {
		i40evf_map_queues(adapter);
		goto watchdog_done;
	}

	if (adapter->aq_required & I40EVF_FLAG_AQ_ADD_MAC_FILTER) {
		i40evf_add_ether_addrs(adapter);
		goto watchdog_done;
	}

	if (adapter->aq_required & I40EVF_FLAG_AQ_ADD_VLAN_FILTER) {
		i40evf_add_vlans(adapter);
		goto watchdog_done;
	}

	if (adapter->aq_required & I40EVF_FLAG_AQ_DEL_MAC_FILTER) {
		i40evf_del_ether_addrs(adapter);
		goto watchdog_done;
	}

	if (adapter->aq_required & I40EVF_FLAG_AQ_DEL_VLAN_FILTER) {
		i40evf_del_vlans(adapter);
		goto watchdog_done;
	}

	if (adapter->aq_required & I40EVF_FLAG_AQ_DISABLE_QUEUES) {
		i40evf_disable_queues(adapter);
		goto watchdog_done;
	}

	if (adapter->aq_required & I40EVF_FLAG_AQ_CONFIGURE_QUEUES) {
		i40evf_configure_queues(adapter);
		goto watchdog_done;
	}

	if (adapter->aq_required & I40EVF_FLAG_AQ_ENABLE_QUEUES) {
		i40evf_enable_queues(adapter);
		goto watchdog_done;
	}

	if (adapter->state == __I40EVF_RUNNING)
		i40evf_request_stats(adapter);
watchdog_done:
1389
1390
1391
1392
1393
1394
1395
	if (adapter->state == __I40EVF_RUNNING) {
		i40evf_irq_enable_queues(adapter, ~0);
		i40evf_fire_sw_int(adapter, 0xFF);
	} else {
		i40evf_fire_sw_int(adapter, 0x1);
	}

1396
1397
	clear_bit(__I40EVF_IN_CRITICAL_TASK, &adapter->crit_section);
restart_watchdog:
1398
1399
	if (adapter->state == __I40EVF_REMOVE)
		return;
Greg Rose's avatar
Greg Rose committed
1400
1401
1402
1403
1404
1405
1406
1407
	if (adapter->aq_required)
		mod_timer(&adapter->watchdog_timer,
			  jiffies + msecs_to_jiffies(20));
	else
		mod_timer(&adapter->watchdog_timer, jiffies + (HZ * 2));
	schedule_work(&adapter->adminq_task);
}

1408
/**
1409
 * next_queue - increment to next available tx queue
1410
1411
1412
1413
1414
1415
 * @adapter: board private structure
 * @j: queue counter
 *
 * Helper function for RSS programming to increment through available
 * queus. Returns the next queue value.
 **/
1416
1417
1418
1419
static int next_queue(struct i40evf_adapter *adapter, int j)
{
	j += 1;

1420
	return j >= adapter->num_active_queues ? 0 : j;
1421
1422
}

Greg Rose's avatar
Greg Rose committed
1423
1424
1425
1426
1427
1428
/**
 * i40evf_configure_rss - Prepare for RSS if used
 * @adapter: board private structure
 **/
static void i40evf_configure_rss(struct i40evf_adapter *adapter)
{
1429
	u32 rss_key[I40E_VFQF_HKEY_MAX_INDEX + 1];
Greg Rose's avatar
Greg Rose committed
1430
1431
1432
1433
1434
	struct i40e_hw *hw = &adapter->hw;
	u32 lut = 0;
	int i, j;
	u64 hena;

1435
1436
1437
1438
1439
1440
	/* No RSS for single queue. */
	if (adapter->num_active_queues == 1) {
		wr32(hw, I40E_VFQF_HENA(0), 0);
		wr32(hw, I40E_VFQF_HENA(1), 0);
		return;
	}
Greg Rose's avatar
Greg Rose committed
1441

1442
	/* Hash type is configured by the PF - we just supply the key */
1443
	netdev_rss_key_fill(rss_key, sizeof(rss_key));
Greg Rose's avatar
Greg Rose committed
1444
	for (i = 0; i <= I40E_VFQF_HKEY_MAX_INDEX; i++)
1445
		wr32(hw, I40E_VFQF_HKEY(i), rss_key[i]);
Greg Rose's avatar
Greg Rose committed
1446
1447
1448
1449
1450
1451
1452

	/* Enable PCTYPES for RSS, TCP/UDP with IPv4/IPv6 */
	hena = I40E_DEFAULT_RSS_HENA;
	wr32(hw, I40E_VFQF_HENA(0), (u32)hena);
	wr32(hw, I40E_VFQF_HENA(1), (u32)(hena >> 32));

	/* Populate the LUT with max no. of queues in round robin fashion */
1453
	j = adapter->num_active_queues;
1454
	for (i = 0; i <= I40E_VFQF_HLUT_MAX_INDEX; i++) {
1455
1456
1457
1458
1459
1460
1461
1462
		j = next_queue(adapter, j);
		lut = j;
		j = next_queue(adapter, j);
		lut |= j << 8;
		j = next_queue(adapter, j);
		lut |= j << 16;
		j = next_queue(adapter, j);
		lut |= j << 24;
1463
		wr32(hw, I40E_VFQF_HLUT(i), lut);
Greg Rose's avatar
Greg Rose committed
1464
1465
1466
1467
	}
	i40e_flush(hw);
}

1468
1469
#define I40EVF_RESET_WAIT_MS 100
#define I40EVF_RESET_WAIT_COUNT 200
Greg Rose's avatar
Greg Rose committed
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
/**
 * i40evf_reset_task - Call-back task to handle hardware reset
 * @work: pointer to work_struct
 *
 * During reset we need to shut down and reinitialize the admin queue
 * before we can use it to communicate with the PF again. We also clear
 * and reinit the rings because that context is lost as well.
 **/
static void i40evf_reset_task(struct work_struct *work)
{
1480
1481
1482
	struct i40evf_adapter *adapter = container_of(work,
						      struct i40evf_adapter,
						      reset_task);
Greg Rose's avatar
Greg Rose committed
1483
1484
1485
1486
1487
1488
	struct i40e_hw *hw = &adapter->hw;
	int i = 0, err;
	uint32_t rstat_val;

	while (test_and_set_bit(__I40EVF_IN_CRITICAL_TASK,
				&adapter->crit_section))
1489
		usleep_range(500, 1000);
1490
1491
1492
1493
1494
1495

	if (adapter->flags & I40EVF_FLAG_RESET_NEEDED) {
		dev_info(&adapter->pdev->dev, "Requesting reset from PF\n");
		i40evf_request_reset(adapter);
	}

1496
1497
1498
1499
	/* poll until we see the reset actually happen */
	for (i = 0; i < I40EVF_RESET_WAIT_COUNT; i++) {
		rstat_val = rd32(hw, I40E_VFGEN_RSTAT) &
			    I40E_VFGEN_RSTAT_VFR_STATE_MASK;
1500
1501
		if ((rstat_val != I40E_VFR_VFACTIVE) &&
		    (rstat_val != I40E_VFR_COMPLETED))
1502
			break;
1503
		msleep(I40EVF_RESET_WAIT_MS);
1504
1505
1506
1507
1508
	}
	if (i == I40EVF_RESET_WAIT_COUNT) {
		adapter->flags &= ~I40EVF_FLAG_RESET_PENDING;
		goto continue_reset; /* act like the reset happened */
	}
Greg Rose's avatar
Greg Rose committed
1509

1510
1511
	/* wait until the reset is complete and the PF is responding to us */
	for (i = 0; i < I40EVF_RESET_WAIT_COUNT; i++) {
Greg Rose's avatar
Greg Rose committed
1512
1513
		rstat_val = rd32(hw, I40E_VFGEN_RSTAT) &
			    I40E_VFGEN_RSTAT_VFR_STATE_MASK;
1514
1515
		if ((rstat_val == I40E_VFR_VFACTIVE) ||
		    (rstat_val == I40E_VFR_COMPLETED))
Greg Rose's avatar
Greg Rose committed
1516
			break;
1517
		msleep(I40EVF_RESET_WAIT_MS);
Greg Rose's avatar
Greg Rose committed
1518
	}
1519
	if (i == I40EVF_RESET_WAIT_COUNT) {
1520
1521
1522
		struct i40evf_mac_filter *f, *ftmp;
		struct i40evf_vlan_filter *fv, *fvtmp;

Greg Rose's avatar
Greg Rose committed
1523
		/* reset never finished */
1524
		dev_err(&adapter->pdev->dev, "Reset never finished (%x)\n",
1525
1526
1527
			rstat_val);
		adapter->flags |= I40EVF_FLAG_PF_COMMS_FAILED;

1528
1529
1530
1531
1532
1533
1534
		if (netif_running(adapter->netdev)) {
			set_bit(__I40E_DOWN, &adapter->vsi.state);
			i40evf_down(adapter);
			i40evf_free_traffic_irqs(adapter);
			i40evf_free_all_tx_resources(adapter);
			i40evf_free_all_rx_resources(adapter);
		}
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547

		/* Delete all of the filters, both MAC and VLAN. */
		list_for_each_entry_safe(f, ftmp, &adapter->mac_filter_list,
					 list) {
			list_del(&f->list);
			kfree(f);
		}
		list_for_each_entry_safe(fv, fvtmp, &adapter->vlan_filter_list,
					 list) {
			list_del(&fv->list);
			kfree(fv);
		}

1548
1549
1550
		i40evf_free_misc_irq(adapter);
		i40evf_reset_interrupt_capability(adapter);
		i40evf_free_queues(adapter);
1551
		i40evf_free_q_vectors(adapter);
1552
1553
1554
1555
1556
		kfree(adapter->vf_res);
		i40evf_shutdown_adminq(hw);
		adapter->netdev->flags &= ~IFF_UP;
		clear_bit(__I40EVF_IN_CRITICAL_TASK, &adapter->crit_section);
		return; /* Do not attempt to reinit. It's dead, Jim. */
Greg Rose's avatar
Greg Rose committed
1557
	}
1558
1559
1560
1561

continue_reset:
	adapter->flags &= ~I40EVF_FLAG_RESET_PENDING;

Greg Rose's avatar
Greg Rose committed
1562
1563
1564
1565
1566
1567
	i40evf_down(adapter);
	adapter->state = __I40EVF_RESETTING;

	/* kill and reinit the admin queue */
	if (i40evf_shutdown_adminq(hw))
		dev_warn(&adapter->pdev->dev,
Mitch Williams's avatar
Mitch Williams committed
1568
1569
			 "%s: Failed to destroy the Admin Queue resources\n",
			 __func__);
Greg Rose's avatar
Greg Rose committed
1570
1571
1572
	err = i40evf_init_adminq(hw);
	if (err)
		dev_info(&adapter->pdev->dev, "%s: init_adminq failed: %d\n",
Mitch Williams's avatar
Mitch Williams committed
1573
			 __func__, err);
Greg Rose's avatar
Greg Rose committed
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602

	adapter->aq_pending = 0;
	adapter->aq_required = 0;
	i40evf_map_queues(adapter);
	clear_bit(__I40EVF_IN_CRITICAL_TASK, &adapter->crit_section);

	mod_timer(&adapter->watchdog_timer, jiffies + 2);

	if (netif_running(adapter->netdev)) {
		/* allocate transmit descriptors */
		err = i40evf_setup_all_tx_resources(adapter);
		if (err)
			goto reset_err;

		/* allocate receive descriptors */
		err = i40evf_setup_all_rx_resources(adapter);
		if (err)
			goto reset_err;

		i40evf_configure(adapter);

		err = i40evf_up_complete(adapter);
		if (err)
			goto reset_err;

		i40evf_irq_enable(adapter, true);
	}
	return;
reset_err:
1603
	dev_err(&adapter->pdev->dev, "failed to allocate resources during reinit\n");
Greg Rose's avatar
Greg Rose committed
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
	i40evf_close(adapter->netdev);
}

/**
 * i40evf_adminq_task - worker thread to clean the admin queue
 * @work: pointer to work_struct containing our data
 **/
static void i40evf_adminq_task(struct work_struct *work)
{
	struct i40evf_adapter *adapter =
		container_of(work, struct i40evf_adapter, adminq_task);
	struct i40e_hw *hw = &adapter->hw;
	struct i40e_arq_event_info event;
	struct i40e_virtchnl_msg *v_msg;
	i40e_status ret;
1619
	u32 val, oldval;
Greg Rose's avatar
Greg Rose committed
1620
1621
	u16 pending;

1622
1623
1624
	if (adapter->flags & I40EVF_FLAG_PF_COMMS_FAILED)
		return;

Mitch Williams's avatar
Mitch Williams committed
1625
1626
	event.buf_len = I40EVF_MAX_AQ_BUF_SIZE;
	event.msg_buf = kzalloc(event.buf_len, GFP_KERNEL);
1627
	if (!event.msg_buf)
Greg Rose's avatar
Greg Rose committed
1628
		return;
1629

Greg Rose's avatar
Greg Rose committed
1630
1631
1632
1633
1634
1635
1636
1637
	v_msg = (struct i40e_virtchnl_msg *)&event.desc;
	do {
		ret = i40evf_clean_arq_element(hw, &event, &pending);
		if (ret)
			break; /* No event to process or error cleaning ARQ */

		i40evf_virtchnl_completion(adapter, v_msg->v_opcode,
					   v_msg->v_retval, event.msg_buf,
Mitch Williams's avatar
Mitch Williams committed
1638
					   event.msg_len);
Mitch Williams's avatar
Mitch Williams committed
1639
		if (pending != 0)
Greg Rose's avatar
Greg Rose committed
1640
1641
1642
			memset(event.msg_buf, 0, I40EVF_MAX_AQ_BUF_SIZE);
	} while (pending);

1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
	/* check for error indications */
	val = rd32(hw, hw->aq.arq.len);
	oldval = val;
	if (val & I40E_VF_ARQLEN_ARQVFE_MASK) {
		dev_info(&adapter->pdev->dev, "ARQ VF Error detected\n");
		val &= ~I40E_VF_ARQLEN_ARQVFE_MASK;
	}
	if (val & I40E_VF_ARQLEN_ARQOVFL_MASK) {
		dev_info(&adapter->pdev->dev, "ARQ Overflow Error detected\n");
		val &= ~I40E_VF_ARQLEN_ARQOVFL_MASK;
	}
	if (val & I40E_VF_ARQLEN_ARQCRIT_MASK) {
		dev_info(&adapter->pdev->dev, "ARQ Critical Error detected\n");
		val &= ~I40E_VF_ARQLEN_ARQCRIT_MASK;
	}
	if (oldval != val)
		wr32(hw, hw->aq.arq.len, val);

	val = rd32(hw, hw->aq.asq.len);
	oldval = val;
	if (val & I40E_VF_ATQLEN_ATQVFE_MASK) {
		dev_info(&adapter->pdev->dev, "ASQ VF Error detected\n");
		val &= ~I40E_VF_ATQLEN_ATQVFE_MASK;
	}
	if (val & I40E_VF_ATQLEN_ATQOVFL_MASK) {
		dev_info(&adapter->pdev->dev, "ASQ Overflow Error detected\n");
		val &= ~I40E_VF_ATQLEN_ATQOVFL_MASK;
	}
	if (val & I40E_VF_ATQLEN_ATQCRIT_MASK) {
		dev_info(&adapter->pdev->dev, "ASQ Critical Error detected\n");
		val &= ~I40E_VF_ATQLEN_ATQCRIT_MASK;
	}
	if (oldval != val)
		wr32(hw, hw->aq.asq.len, val);

Greg Rose's avatar
Greg Rose committed
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
	/* re-enable Admin queue interrupt cause */
	i40evf_misc_irq_enable(adapter);

	kfree(event.msg_buf);
}

/**
 * i40evf_free_all_tx_resources - Free Tx Resources for All Queues
 * @adapter: board private structure
 *
 * Free all transmit software resources
 **/
static void i40evf_free_all_tx_resources(struct i40evf_adapter *adapter)
{
	int i;

1694
	for (i = 0; i < adapter->num_active_queues; i++)
Greg Rose's avatar
Greg Rose committed
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
		if (adapter->tx_rings[i]->desc)
			i40evf_free_tx_resources(adapter->tx_rings[i]);
}

/**
 * i40evf_setup_all_tx_resources - allocate all queues Tx resources
 * @adapter: board private structure
 *
 * If this function returns with an error, then it's possible one or
 * more of the rings is populated (while the rest are not).  It is the
 * callers duty to clean those orphaned rings.
 *
 * Return 0 on success, negative on failure
 **/
static int i40evf_setup_all_tx_resources(struct i40evf_adapter *adapter)
{
	int i, err = 0;

1713
	for (i = 0; i < adapter->num_active_queues; i++) {
1714
		adapter->tx_rings[i]->count = adapter->tx_desc_count;
Greg Rose's avatar
Greg Rose committed
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
		err = i40evf_setup_tx_descriptors(adapter->tx_rings[i]);
		if (!err)
			continue;
		dev_err(&adapter->pdev->dev,
			"%s: Allocation for Tx Queue %u failed\n",
			__func__, i);
		break;
	}

	return err;
}

/**
 * i40evf_setup_all_rx_resources - allocate all queues Rx resources
 * @adapter: board private structure
 *
 * If this function returns with an error, then it's possible one or
 * more of the rings is populated (while the rest are not).  It is the
 * callers duty to clean those orphaned rings.
 *
 * Return 0 on success, negative on failure
 **/
static int i40evf_setup_all_rx_resources(struct i40evf_adapter *adapter)
{
	int i, err = 0;

1741
	for (i = 0; i < adapter->num_active_queues; i++) {
1742
		adapter->rx_rings[i]->count = adapter->rx_desc_count;
Greg Rose's avatar
Greg Rose committed
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
		err = i40evf_setup_rx_descriptors(adapter->rx_rings[i]);
		if (!err)
			continue;
		dev_err(&adapter->pdev->dev,
			"%s: Allocation for Rx Queue %u failed\n",
			__func__, i);
		break;
	}
	return err;
}

/**
 * i40evf_free_all_rx_resources - Free Rx Resources for All Queues
 * @adapter: board private structure
 *
 * Free all receive software resources
 **/
static void i40evf_free_all_rx_resources(struct i40evf_adapter *adapter)
{
	int i;

1764
	for (i = 0; i < adapter->num_active_queues; i++)
Greg Rose's avatar
Greg Rose committed
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
		if (adapter->rx_rings[i]->desc)
			i40evf_free_rx_resources(adapter->rx_rings[i]);
}

/**
 * i40evf_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).  At this point all resources needed
 * for transmit and receive operations are allocated, the interrupt
 * handler is registered with the OS, the watchdog timer is started,
 * and the stack is notified that the interface is ready.
 **/
static int i40evf_open(struct net_device *netdev)
{
	struct i40evf_adapter *adapter = netdev_priv(netdev);
	int err;

1786
1787
1788
1789
	if (adapter->flags & I40EVF_FLAG_PF_COMMS_FAILED) {
		dev_err(&adapter->pdev->dev, "Unable to open device due to PF driver failure.\n");
		return -EIO;
	}
Greg Rose's avatar
Greg Rose committed
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
	if (adapter->state != __I40EVF_DOWN)
		return -EBUSY;

	/* allocate transmit descriptors */
	err = i40evf_setup_all_tx_resources(adapter);
	if (err)
		goto err_setup_tx;

	/* allocate receive descriptors */
	err = i40evf_setup_all_rx_resources(adapter);
	if (err)
		goto err_setup_rx;

	/* clear any pending interrupts, may auto mask */
	err = i40evf_request_traffic_irqs(adapter, netdev->name);
	if (err)
		goto err_req_irq;

	i40evf_configure(adapter);

	err = i40evf_up_complete(adapter);
	if (err)
		goto err_req_irq;

	i40evf_irq_enable(adapter, true);

	return 0;

err_req_irq:
	i40evf_down(adapter);
	i40evf_free_traffic_irqs(adapter);
err_setup_rx:
	i40evf_free_all_rx_resources(adapter);
err_setup_tx:
	i40evf_free_all_tx_resources(adapter);

	return err;
}

/**
 * i40evf_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. All IRQs except vector 0 (reserved for admin queue)
 * are freed, along with all transmit and receive resources.
 **/
static int i40evf_close(struct net_device *netdev)
{
	struct i40evf_adapter *adapter = netdev_priv(netdev);

1844
1845
1846
1847
	if (adapter->state <= __I40EVF_DOWN)
		return 0;


Greg Rose's avatar
Greg Rose committed
1848
1849
1850
	set_bit(__I40E_DOWN, &adapter->vsi.state);

	i40evf_down(adapter);
Mitch Williams's avatar
Mitch Williams committed
1851
	adapter->state = __I40EVF_DOWN;
Greg Rose's avatar
Greg Rose committed
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
	i40evf_free_traffic_irqs(adapter);

	i40evf_free_all_tx_resources(adapter);
	i40evf_free_all_rx_resources(adapter);

	return 0;
}

/**
 * i40evf_get_stats - Get System Network Statistics
 * @netdev: network interface device structure
 *
 * Returns the address of the device statistics structure.
 * The statistics are actually updated from the timer callback.
 **/
static struct net_device_stats *i40evf_get_stats(struct net_device *netdev)
{
	struct i40evf_adapter *adapter = netdev_priv(netdev);

	/* only return the current stats */
	return &adapter->net_stats;
}

/**
 * i40evf_reinit_locked - Software reinit
 * @adapter: board private structure
 *
 * Reinititalizes the ring structures in response to a software configuration
 * change. Roughly the same as close followed by open, but skips releasing
 * and reallocating the interrupts.
 **/
void i40evf_reinit_locked(struct i40evf_adapter *adapter)
{
	struct net_device *netdev = adapter->netdev;
	int err;

	WARN_ON(in_interrupt());

	i40evf_down(adapter);

	/* allocate transmit descriptors */
	err = i40evf_setup_all_tx_resources(adapter);
	if (err)
		goto err_reinit;

	/* allocate receive descriptors */
	err = i40evf_setup_all_rx_resources(adapter);
	if (err)
		goto err_reinit;

	i40evf_configure(adapter);

	err = i40evf_up_complete(adapter);
	if (err)
		goto err_reinit;

	i40evf_irq_enable(adapter, true);
	return;

err_reinit:
1912
	dev_err(&adapter->pdev->dev, "failed to allocate resources during reinit\n");
Greg Rose's avatar
Greg Rose committed
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
	i40evf_close(netdev);
}

/**
 * i40evf_change_mtu - Change the Maximum Transfer Unit
 * @netdev: network interface device structure
 * @new_mtu: new value for maximum frame size
 *
 * Returns 0 on success, negative on failure
 **/
static int i40evf_change_mtu(struct net_device *netdev, int new_mtu)
{
	struct i40evf_adapter *adapter = netdev_priv(netdev);
	int max_frame = new_mtu + ETH_HLEN + ETH_FCS_LEN;

	if ((new_mtu < 68) || (max_frame > I40E_MAX_RXBUFFER))
		return -EINVAL;

	/* must set new MTU before calling down or up */
	netdev->mtu = new_mtu;
	i40evf_reinit_locked(adapter);
	return 0;
}

static const struct net_device_ops i40evf_netdev_ops = {
	.ndo_open		= i40evf_open,
	.ndo_stop		= i40evf_close,
	.ndo_start_xmit		= i40evf_xmit_frame,
	.ndo_get_stats		= i40evf_get_stats,
	.ndo_set_rx_mode	= i40evf_set_rx_mode,
	.ndo_validate_addr	= eth_validate_addr,
	.ndo_set_mac_address	= i40evf_set_mac,
	.ndo_change_mtu		= i40evf_change_mtu,
	.ndo_tx_timeout		= i40evf_tx_timeout,
	.ndo_vlan_rx_add_vid	= i40evf_vlan_rx_add_vid,
	.ndo_vlan_rx_kill_vid	= i40evf_vlan_rx_kill_vid,
};

/**
 * i40evf_check_reset_complete - check that VF reset is complete
 * @hw: pointer to hw struct
 *
 * Returns 0 if device is ready to use, or -EBUSY if it's in reset.
 **/
static int i40evf_check_reset_complete(struct i40e_hw *hw)
{
	u32 rstat;
	int i;

	for (i = 0; i < 100; i++) {
1963
1964
1965
1966
		rstat = rd32(hw, I40E_VFGEN_RSTAT) &
			    I40E_VFGEN_RSTAT_VFR_STATE_MASK;
		if ((rstat == I40E_VFR_VFACTIVE) ||
		    (rstat == I40E_VFR_COMPLETED))
Greg Rose's avatar
Greg Rose committed
1967
			return 0;
1968
		usleep_range(10, 20);
Greg Rose's avatar
Greg Rose committed
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992