summaryrefslogtreecommitdiff
path: root/drivers/infiniband/hw/hfi1/vnic_main.c
blob: a90824de0f5716b2bc9373633ce30dcdeb75eddf (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
/*
 * Copyright(c) 2017 - 2020 Intel Corporation.
 *
 * This file is provided under a dual BSD/GPLv2 license.  When using or
 * redistributing this file, you may do so under either license.
 *
 * GPL LICENSE SUMMARY
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that 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.
 *
 * BSD LICENSE
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *  - Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  - Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *  - Neither the name of Intel Corporation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

/*
 * This file contains HFI1 support for VNIC functionality
 */

#include <linux/io.h>
#include <linux/if_vlan.h>

#include "vnic.h"
#include "netdev.h"

#define HFI_TX_TIMEOUT_MS 1000

#define HFI1_VNIC_RCV_Q_SIZE   1024

#define HFI1_VNIC_UP 0

static DEFINE_SPINLOCK(vport_cntr_lock);

#define SUM_GRP_COUNTERS(stats, qstats, x_grp) do {            \
		u64 *src64, *dst64;                            \
		for (src64 = &qstats->x_grp.unicast,           \
			dst64 = &stats->x_grp.unicast;         \
			dst64 <= &stats->x_grp.s_1519_max;) {  \
			*dst64++ += *src64++;                  \
		}                                              \
	} while (0)

#define VNIC_MASK (0xFF)
#define VNIC_ID(val) ((1ull << 24) | ((val) & VNIC_MASK))

/* hfi1_vnic_update_stats - update statistics */
static void hfi1_vnic_update_stats(struct hfi1_vnic_vport_info *vinfo,
				   struct opa_vnic_stats *stats)
{
	struct net_device *netdev = vinfo->netdev;
	u8 i;

	/* add tx counters on different queues */
	for (i = 0; i < vinfo->num_tx_q; i++) {
		struct opa_vnic_stats *qstats = &vinfo->stats[i];
		struct rtnl_link_stats64 *qnstats = &vinfo->stats[i].netstats;

		stats->netstats.tx_fifo_errors += qnstats->tx_fifo_errors;
		stats->netstats.tx_carrier_errors += qnstats->tx_carrier_errors;
		stats->tx_drop_state += qstats->tx_drop_state;
		stats->tx_dlid_zero += qstats->tx_dlid_zero;

		SUM_GRP_COUNTERS(stats, qstats, tx_grp);
		stats->netstats.tx_packets += qnstats->tx_packets;
		stats->netstats.tx_bytes += qnstats->tx_bytes;
	}

	/* add rx counters on different queues */
	for (i = 0; i < vinfo->num_rx_q; i++) {
		struct opa_vnic_stats *qstats = &vinfo->stats[i];
		struct rtnl_link_stats64 *qnstats = &vinfo->stats[i].netstats;

		stats->netstats.rx_fifo_errors += qnstats->rx_fifo_errors;
		stats->netstats.rx_nohandler += qnstats->rx_nohandler;
		stats->rx_drop_state += qstats->rx_drop_state;
		stats->rx_oversize += qstats->rx_oversize;
		stats->rx_runt += qstats->rx_runt;

		SUM_GRP_COUNTERS(stats, qstats, rx_grp);
		stats->netstats.rx_packets += qnstats->rx_packets;
		stats->netstats.rx_bytes += qnstats->rx_bytes;
	}

	stats->netstats.tx_errors = stats->netstats.tx_fifo_errors +
				    stats->netstats.tx_carrier_errors +
				    stats->tx_drop_state + stats->tx_dlid_zero;
	stats->netstats.tx_dropped = stats->netstats.tx_errors;

	stats->netstats.rx_errors = stats->netstats.rx_fifo_errors +
				    stats->netstats.rx_nohandler +
				    stats->rx_drop_state + stats->rx_oversize +
				    stats->rx_runt;
	stats->netstats.rx_dropped = stats->netstats.rx_errors;

	netdev->stats.tx_packets = stats->netstats.tx_packets;
	netdev->stats.tx_bytes = stats->netstats.tx_bytes;
	netdev->stats.tx_fifo_errors = stats->netstats.tx_fifo_errors;
	netdev->stats.tx_carrier_errors = stats->netstats.tx_carrier_errors;
	netdev->stats.tx_errors = stats->netstats.tx_errors;
	netdev->stats.tx_dropped = stats->netstats.tx_dropped;

	netdev->stats.rx_packets = stats->netstats.rx_packets;
	netdev->stats.rx_bytes = stats->netstats.rx_bytes;
	netdev->stats.rx_fifo_errors = stats->netstats.rx_fifo_errors;
	netdev->stats.multicast = stats->rx_grp.mcastbcast;
	netdev->stats.rx_length_errors = stats->rx_oversize + stats->rx_runt;
	netdev->stats.rx_errors = stats->netstats.rx_errors;
	netdev->stats.rx_dropped = stats->netstats.rx_dropped;
}

/* update_len_counters - update pkt's len histogram counters */
static inline void update_len_counters(struct opa_vnic_grp_stats *grp,
				       int len)
{
	/* account for 4 byte FCS */
	if (len >= 1515)
		grp->s_1519_max++;
	else if (len >= 1020)
		grp->s_1024_1518++;
	else if (len >= 508)
		grp->s_512_1023++;
	else if (len >= 252)
		grp->s_256_511++;
	else if (len >= 124)
		grp->s_128_255++;
	else if (len >= 61)
		grp->s_65_127++;
	else
		grp->s_64++;
}

/* hfi1_vnic_update_tx_counters - update transmit counters */
static void hfi1_vnic_update_tx_counters(struct hfi1_vnic_vport_info *vinfo,
					 u8 q_idx, struct sk_buff *skb, int err)
{
	struct ethhdr *mac_hdr = (struct ethhdr *)skb_mac_header(skb);
	struct opa_vnic_stats *stats = &vinfo->stats[q_idx];
	struct opa_vnic_grp_stats *tx_grp = &stats->tx_grp;
	u16 vlan_tci;

	stats->netstats.tx_packets++;
	stats->netstats.tx_bytes += skb->len + ETH_FCS_LEN;

	update_len_counters(tx_grp, skb->len);

	/* rest of the counts are for good packets only */
	if (unlikely(err))
		return;

	if (is_multicast_ether_addr(mac_hdr->h_dest))
		tx_grp->mcastbcast++;
	else
		tx_grp->unicast++;

	if (!__vlan_get_tag(skb, &vlan_tci))
		tx_grp->vlan++;
	else
		tx_grp->untagged++;
}

/* hfi1_vnic_update_rx_counters - update receive counters */
static void hfi1_vnic_update_rx_counters(struct hfi1_vnic_vport_info *vinfo,
					 u8 q_idx, struct sk_buff *skb, int err)
{
	struct ethhdr *mac_hdr = (struct ethhdr *)skb->data;
	struct opa_vnic_stats *stats = &vinfo->stats[q_idx];
	struct opa_vnic_grp_stats *rx_grp = &stats->rx_grp;
	u16 vlan_tci;

	stats->netstats.rx_packets++;
	stats->netstats.rx_bytes += skb->len + ETH_FCS_LEN;

	update_len_counters(rx_grp, skb->len);

	/* rest of the counts are for good packets only */
	if (unlikely(err))
		return;

	if (is_multicast_ether_addr(mac_hdr->h_dest))
		rx_grp->mcastbcast++;
	else
		rx_grp->unicast++;

	if (!__vlan_get_tag(skb, &vlan_tci))
		rx_grp->vlan++;
	else
		rx_grp->untagged++;
}

/* This function is overloaded for opa_vnic specific implementation */
static void hfi1_vnic_get_stats64(struct net_device *netdev,
				  struct rtnl_link_stats64 *stats)
{
	struct opa_vnic_stats *vstats = (struct opa_vnic_stats *)stats;
	struct hfi1_vnic_vport_info *vinfo = opa_vnic_dev_priv(netdev);

	hfi1_vnic_update_stats(vinfo, vstats);
}

static u64 create_bypass_pbc(u32 vl, u32 dw_len)
{
	u64 pbc;

	pbc = ((u64)PBC_IHCRC_NONE << PBC_INSERT_HCRC_SHIFT)
		| PBC_INSERT_BYPASS_ICRC | PBC_CREDIT_RETURN
		| PBC_PACKET_BYPASS
		| ((vl & PBC_VL_MASK) << PBC_VL_SHIFT)
		| (dw_len & PBC_LENGTH_DWS_MASK) << PBC_LENGTH_DWS_SHIFT;

	return pbc;
}

/* hfi1_vnic_maybe_stop_tx - stop tx queue if required */
static void hfi1_vnic_maybe_stop_tx(struct hfi1_vnic_vport_info *vinfo,
				    u8 q_idx)
{
	netif_stop_subqueue(vinfo->netdev, q_idx);
	if (!hfi1_vnic_sdma_write_avail(vinfo, q_idx))
		return;

	netif_start_subqueue(vinfo->netdev, q_idx);
}

static netdev_tx_t hfi1_netdev_start_xmit(struct sk_buff *skb,
					  struct net_device *netdev)
{
	struct hfi1_vnic_vport_info *vinfo = opa_vnic_dev_priv(netdev);
	u8 pad_len, q_idx = skb->queue_mapping;
	struct hfi1_devdata *dd = vinfo->dd;
	struct opa_vnic_skb_mdata *mdata;
	u32 pkt_len, total_len;
	int err = -EINVAL;
	u64 pbc;

	v_dbg("xmit: queue %d skb len %d\n", q_idx, skb->len);
	if (unlikely(!netif_oper_up(netdev))) {
		vinfo->stats[q_idx].tx_drop_state++;
		goto tx_finish;
	}

	/* take out meta data */
	mdata = (struct opa_vnic_skb_mdata *)skb->data;
	skb_pull(skb, sizeof(*mdata));
	if (unlikely(mdata->flags & OPA_VNIC_SKB_MDATA_ENCAP_ERR)) {
		vinfo->stats[q_idx].tx_dlid_zero++;
		goto tx_finish;
	}

	/* add tail padding (for 8 bytes size alignment) and icrc */
	pad_len = -(skb->len + OPA_VNIC_ICRC_TAIL_LEN) & 0x7;
	pad_len += OPA_VNIC_ICRC_TAIL_LEN;

	/*
	 * pkt_len is how much data we have to write, includes header and data.
	 * total_len is length of the packet in Dwords plus the PBC should not
	 * include the CRC.
	 */
	pkt_len = (skb->len + pad_len) >> 2;
	total_len = pkt_len + 2; /* PBC + packet */

	pbc = create_bypass_pbc(mdata->vl, total_len);

	skb_get(skb);
	v_dbg("pbc 0x%016llX len %d pad_len %d\n", pbc, skb->len, pad_len);
	err = dd->process_vnic_dma_send(dd, q_idx, vinfo, skb, pbc, pad_len);
	if (unlikely(err)) {
		if (err == -ENOMEM)
			vinfo->stats[q_idx].netstats.tx_fifo_errors++;
		else if (err != -EBUSY)
			vinfo->stats[q_idx].netstats.tx_carrier_errors++;
	}
	/* remove the header before updating tx counters */
	skb_pull(skb, OPA_VNIC_HDR_LEN);

	if (unlikely(err == -EBUSY)) {
		hfi1_vnic_maybe_stop_tx(vinfo, q_idx);
		dev_kfree_skb_any(skb);
		return NETDEV_TX_BUSY;
	}

tx_finish:
	/* update tx counters */
	hfi1_vnic_update_tx_counters(vinfo, q_idx, skb, err);
	dev_kfree_skb_any(skb);
	return NETDEV_TX_OK;
}

static u16 hfi1_vnic_select_queue(struct net_device *netdev,
				  struct sk_buff *skb,
				  struct net_device *sb_dev)
{
	struct hfi1_vnic_vport_info *vinfo = opa_vnic_dev_priv(netdev);
	struct opa_vnic_skb_mdata *mdata;
	struct sdma_engine *sde;

	mdata = (struct opa_vnic_skb_mdata *)skb->data;
	sde = sdma_select_engine_vl(vinfo->dd, mdata->entropy, mdata->vl);
	return sde->this_idx;
}

/* hfi1_vnic_decap_skb - strip OPA header from the skb (ethernet) packet */
static inline int hfi1_vnic_decap_skb(struct hfi1_vnic_rx_queue *rxq,
				      struct sk_buff *skb)
{
	struct hfi1_vnic_vport_info *vinfo = rxq->vinfo;
	int max_len = vinfo->netdev->mtu + VLAN_ETH_HLEN;
	int rc = -EFAULT;

	skb_pull(skb, OPA_VNIC_HDR_LEN);

	/* Validate Packet length */
	if (unlikely(skb->len > max_len))
		vinfo->stats[rxq->idx].rx_oversize++;
	else if (unlikely(skb->len < ETH_ZLEN))
		vinfo->stats[rxq->idx].rx_runt++;
	else
		rc = 0;
	return rc;
}

static struct hfi1_vnic_vport_info *get_vnic_port(struct hfi1_devdata *dd,
						  int vesw_id)
{
	int vnic_id = VNIC_ID(vesw_id);

	return hfi1_netdev_get_data(dd, vnic_id);
}

static struct hfi1_vnic_vport_info *get_first_vnic_port(struct hfi1_devdata *dd)
{
	struct hfi1_vnic_vport_info *vinfo;
	int next_id = VNIC_ID(0);

	vinfo = hfi1_netdev_get_first_data(dd, &next_id);

	if (next_id > VNIC_ID(VNIC_MASK))
		return NULL;

	return vinfo;
}

void hfi1_vnic_bypass_rcv(struct hfi1_packet *packet)
{
	struct hfi1_devdata *dd = packet->rcd->dd;
	struct hfi1_vnic_vport_info *vinfo = NULL;
	struct hfi1_vnic_rx_queue *rxq;
	struct sk_buff *skb;
	int l4_type, vesw_id = -1, rc;
	u8 q_idx;
	unsigned char *pad_info;

	l4_type = hfi1_16B_get_l4(packet->ebuf);
	if (likely(l4_type == OPA_16B_L4_ETHR)) {
		vesw_id = HFI1_VNIC_GET_VESWID(packet->ebuf);
		vinfo = get_vnic_port(dd, vesw_id);

		/*
		 * In case of invalid vesw id, count the error on
		 * the first available vport.
		 */
		if (unlikely(!vinfo)) {
			struct hfi1_vnic_vport_info *vinfo_tmp;

			vinfo_tmp = get_first_vnic_port(dd);
			if (vinfo_tmp) {
				spin_lock(&vport_cntr_lock);
				vinfo_tmp->stats[0].netstats.rx_nohandler++;
				spin_unlock(&vport_cntr_lock);
			}
		}
	}

	if (unlikely(!vinfo)) {
		dd_dev_warn(dd, "vnic rcv err: l4 %d vesw id %d ctx %d\n",
			    l4_type, vesw_id, packet->rcd->ctxt);
		return;
	}

	q_idx = packet->rcd->vnic_q_idx;
	rxq = &vinfo->rxq[q_idx];
	if (unlikely(!netif_oper_up(vinfo->netdev))) {
		vinfo->stats[q_idx].rx_drop_state++;
		return;
	}

	skb = netdev_alloc_skb(vinfo->netdev, packet->tlen);
	if (unlikely(!skb)) {
		vinfo->stats[q_idx].netstats.rx_fifo_errors++;
		return;
	}

	memcpy(skb->data, packet->ebuf, packet->tlen);
	skb_put(skb, packet->tlen);

	pad_info = skb->data + skb->len - 1;
	skb_trim(skb, (skb->len - OPA_VNIC_ICRC_TAIL_LEN -
		       ((*pad_info) & 0x7)));

	rc = hfi1_vnic_decap_skb(rxq, skb);

	/* update rx counters */
	hfi1_vnic_update_rx_counters(vinfo, rxq->idx, skb, rc);
	if (unlikely(rc)) {
		dev_kfree_skb_any(skb);
		return;
	}

	skb_checksum_none_assert(skb);
	skb->protocol = eth_type_trans(skb, rxq->netdev);

	napi_gro_receive(&rxq->napi, skb);
}

static int hfi1_vnic_up(struct hfi1_vnic_vport_info *vinfo)
{
	struct hfi1_devdata *dd = vinfo->dd;
	struct net_device *netdev = vinfo->netdev;
	int rc;

	/* ensure virtual eth switch id is valid */
	if (!vinfo->vesw_id)
		return -EINVAL;

	rc = hfi1_netdev_add_data(dd, VNIC_ID(vinfo->vesw_id), vinfo);
	if (rc < 0)
		return rc;

	rc = hfi1_netdev_rx_init(dd);
	if (rc)
		goto err_remove;

	netif_carrier_on(netdev);
	netif_tx_start_all_queues(netdev);
	set_bit(HFI1_VNIC_UP, &vinfo->flags);

	return 0;

err_remove:
	hfi1_netdev_remove_data(dd, VNIC_ID(vinfo->vesw_id));
	return rc;
}

static void hfi1_vnic_down(struct hfi1_vnic_vport_info *vinfo)
{
	struct hfi1_devdata *dd = vinfo->dd;

	clear_bit(HFI1_VNIC_UP, &vinfo->flags);
	netif_carrier_off(vinfo->netdev);
	netif_tx_disable(vinfo->netdev);
	hfi1_netdev_remove_data(dd, VNIC_ID(vinfo->vesw_id));

	hfi1_netdev_rx_destroy(dd);
}

static int hfi1_netdev_open(struct net_device *netdev)
{
	struct hfi1_vnic_vport_info *vinfo = opa_vnic_dev_priv(netdev);
	int rc;

	mutex_lock(&vinfo->lock);
	rc = hfi1_vnic_up(vinfo);
	mutex_unlock(&vinfo->lock);
	return rc;
}

static int hfi1_netdev_close(struct net_device *netdev)
{
	struct hfi1_vnic_vport_info *vinfo = opa_vnic_dev_priv(netdev);

	mutex_lock(&vinfo->lock);
	if (test_bit(HFI1_VNIC_UP, &vinfo->flags))
		hfi1_vnic_down(vinfo);
	mutex_unlock(&vinfo->lock);
	return 0;
}

static int hfi1_vnic_init(struct hfi1_vnic_vport_info *vinfo)
{
	struct hfi1_devdata *dd = vinfo->dd;
	int rc = 0;

	mutex_lock(&hfi1_mutex);
	if (!dd->vnic_num_vports) {
		rc = hfi1_vnic_txreq_init(dd);
		if (rc)
			goto txreq_fail;
	}

	rc = hfi1_netdev_rx_init(dd);
	if (rc) {
		dd_dev_err(dd, "Unable to initialize netdev contexts\n");
		goto alloc_fail;
	}

	hfi1_init_vnic_rsm(dd);

	dd->vnic_num_vports++;
	hfi1_vnic_sdma_init(vinfo);

alloc_fail:
	if (!dd->vnic_num_vports)
		hfi1_vnic_txreq_deinit(dd);
txreq_fail:
	mutex_unlock(&hfi1_mutex);
	return rc;
}

static void hfi1_vnic_deinit(struct hfi1_vnic_vport_info *vinfo)
{
	struct hfi1_devdata *dd = vinfo->dd;

	mutex_lock(&hfi1_mutex);
	if (--dd->vnic_num_vports == 0) {
		hfi1_deinit_vnic_rsm(dd);
		hfi1_vnic_txreq_deinit(dd);
	}
	mutex_unlock(&hfi1_mutex);
	hfi1_netdev_rx_destroy(dd);
}

static void hfi1_vnic_set_vesw_id(struct net_device *netdev, int id)
{
	struct hfi1_vnic_vport_info *vinfo = opa_vnic_dev_priv(netdev);
	bool reopen = false;

	/*
	 * If vesw_id is being changed, and if the vnic port is up,
	 * reset the vnic port to ensure new vesw_id gets picked up
	 */
	if (id != vinfo->vesw_id) {
		mutex_lock(&vinfo->lock);
		if (test_bit(HFI1_VNIC_UP, &vinfo->flags)) {
			hfi1_vnic_down(vinfo);
			reopen = true;
		}

		vinfo->vesw_id = id;
		if (reopen)
			hfi1_vnic_up(vinfo);

		mutex_unlock(&vinfo->lock);
	}
}

/* netdev ops */
static const struct net_device_ops hfi1_netdev_ops = {
	.ndo_open = hfi1_netdev_open,
	.ndo_stop = hfi1_netdev_close,
	.ndo_start_xmit = hfi1_netdev_start_xmit,
	.ndo_select_queue = hfi1_vnic_select_queue,
	.ndo_get_stats64 = hfi1_vnic_get_stats64,
};

static void hfi1_vnic_free_rn(struct net_device *netdev)
{
	struct hfi1_vnic_vport_info *vinfo = opa_vnic_dev_priv(netdev);

	hfi1_vnic_deinit(vinfo);
	mutex_destroy(&vinfo->lock);
	free_netdev(netdev);
}

struct net_device *hfi1_vnic_alloc_rn(struct ib_device *device,
				      u8 port_num,
				      enum rdma_netdev_t type,
				      const char *name,
				      unsigned char name_assign_type,
				      void (*setup)(struct net_device *))
{
	struct hfi1_devdata *dd = dd_from_ibdev(device);
	struct hfi1_vnic_vport_info *vinfo;
	struct net_device *netdev;
	struct rdma_netdev *rn;
	int i, size, rc;

	if (!dd->num_netdev_contexts)
		return ERR_PTR(-ENOMEM);

	if (!port_num || (port_num > dd->num_pports))
		return ERR_PTR(-EINVAL);

	if (type != RDMA_NETDEV_OPA_VNIC)
		return ERR_PTR(-EOPNOTSUPP);

	size = sizeof(struct opa_vnic_rdma_netdev) + sizeof(*vinfo);
	netdev = alloc_netdev_mqs(size, name, name_assign_type, setup,
				  chip_sdma_engines(dd),
				  dd->num_netdev_contexts);
	if (!netdev)
		return ERR_PTR(-ENOMEM);

	rn = netdev_priv(netdev);
	vinfo = opa_vnic_dev_priv(netdev);
	vinfo->dd = dd;
	vinfo->num_tx_q = chip_sdma_engines(dd);
	vinfo->num_rx_q = dd->num_netdev_contexts;
	vinfo->netdev = netdev;
	rn->free_rdma_netdev = hfi1_vnic_free_rn;
	rn->set_id = hfi1_vnic_set_vesw_id;

	netdev->features = NETIF_F_HIGHDMA | NETIF_F_SG;
	netdev->hw_features = netdev->features;
	netdev->vlan_features = netdev->features;
	netdev->watchdog_timeo = msecs_to_jiffies(HFI_TX_TIMEOUT_MS);
	netdev->netdev_ops = &hfi1_netdev_ops;
	mutex_init(&vinfo->lock);

	for (i = 0; i < vinfo->num_rx_q; i++) {
		struct hfi1_vnic_rx_queue *rxq = &vinfo->rxq[i];

		rxq->idx = i;
		rxq->vinfo = vinfo;
		rxq->netdev = netdev;
	}

	rc = hfi1_vnic_init(vinfo);
	if (rc)
		goto init_fail;

	return netdev;
init_fail:
	mutex_destroy(&vinfo->lock);
	free_netdev(netdev);
	return ERR_PTR(rc);
}