summaryrefslogtreecommitdiff
path: root/drivers/net/ethernet/intel/ice/ice_arfs.c
blob: 6560acd76c94954de12ce7bbd76d16d8cd68857d (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
// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) 2018-2020, Intel Corporation. */

#include "ice.h"

/**
 * ice_is_arfs_active - helper to check is aRFS is active
 * @vsi: VSI to check
 */
static bool ice_is_arfs_active(struct ice_vsi *vsi)
{
	return !!vsi->arfs_fltr_list;
}

/**
 * ice_is_arfs_using_perfect_flow - check if aRFS has active perfect filters
 * @hw: pointer to the HW structure
 * @flow_type: flow type as Flow Director understands it
 *
 * Flow Director will query this function to see if aRFS is currently using
 * the specified flow_type for perfect (4-tuple) filters.
 */
bool
ice_is_arfs_using_perfect_flow(struct ice_hw *hw, enum ice_fltr_ptype flow_type)
{
	struct ice_arfs_active_fltr_cntrs *arfs_fltr_cntrs;
	struct ice_pf *pf = hw->back;
	struct ice_vsi *vsi;

	vsi = ice_get_main_vsi(pf);
	if (!vsi)
		return false;

	arfs_fltr_cntrs = vsi->arfs_fltr_cntrs;

	/* active counters can be updated by multiple CPUs */
	smp_mb__before_atomic();
	switch (flow_type) {
	case ICE_FLTR_PTYPE_NONF_IPV4_UDP:
		return atomic_read(&arfs_fltr_cntrs->active_udpv4_cnt) > 0;
	case ICE_FLTR_PTYPE_NONF_IPV6_UDP:
		return atomic_read(&arfs_fltr_cntrs->active_udpv6_cnt) > 0;
	case ICE_FLTR_PTYPE_NONF_IPV4_TCP:
		return atomic_read(&arfs_fltr_cntrs->active_tcpv4_cnt) > 0;
	case ICE_FLTR_PTYPE_NONF_IPV6_TCP:
		return atomic_read(&arfs_fltr_cntrs->active_tcpv6_cnt) > 0;
	default:
		return false;
	}
}

/**
 * ice_arfs_update_active_fltr_cntrs - update active filter counters for aRFS
 * @vsi: VSI that aRFS is active on
 * @entry: aRFS entry used to change counters
 * @add: true to increment counter, false to decrement
 */
static void
ice_arfs_update_active_fltr_cntrs(struct ice_vsi *vsi,
				  struct ice_arfs_entry *entry, bool add)
{
	struct ice_arfs_active_fltr_cntrs *fltr_cntrs = vsi->arfs_fltr_cntrs;

	switch (entry->fltr_info.flow_type) {
	case ICE_FLTR_PTYPE_NONF_IPV4_TCP:
		if (add)
			atomic_inc(&fltr_cntrs->active_tcpv4_cnt);
		else
			atomic_dec(&fltr_cntrs->active_tcpv4_cnt);
		break;
	case ICE_FLTR_PTYPE_NONF_IPV6_TCP:
		if (add)
			atomic_inc(&fltr_cntrs->active_tcpv6_cnt);
		else
			atomic_dec(&fltr_cntrs->active_tcpv6_cnt);
		break;
	case ICE_FLTR_PTYPE_NONF_IPV4_UDP:
		if (add)
			atomic_inc(&fltr_cntrs->active_udpv4_cnt);
		else
			atomic_dec(&fltr_cntrs->active_udpv4_cnt);
		break;
	case ICE_FLTR_PTYPE_NONF_IPV6_UDP:
		if (add)
			atomic_inc(&fltr_cntrs->active_udpv6_cnt);
		else
			atomic_dec(&fltr_cntrs->active_udpv6_cnt);
		break;
	default:
		dev_err(ice_pf_to_dev(vsi->back), "aRFS: Failed to update filter counters, invalid filter type %d\n",
			entry->fltr_info.flow_type);
	}
}

/**
 * ice_arfs_del_flow_rules - delete the rules passed in from HW
 * @vsi: VSI for the flow rules that need to be deleted
 * @del_list_head: head of the list of ice_arfs_entry(s) for rule deletion
 *
 * Loop through the delete list passed in and remove the rules from HW. After
 * each rule is deleted, disconnect and free the ice_arfs_entry because it is no
 * longer being referenced by the aRFS hash table.
 */
static void
ice_arfs_del_flow_rules(struct ice_vsi *vsi, struct hlist_head *del_list_head)
{
	struct ice_arfs_entry *e;
	struct hlist_node *n;
	struct device *dev;

	dev = ice_pf_to_dev(vsi->back);

	hlist_for_each_entry_safe(e, n, del_list_head, list_entry) {
		int result;

		result = ice_fdir_write_fltr(vsi->back, &e->fltr_info, false,
					     false);
		if (!result)
			ice_arfs_update_active_fltr_cntrs(vsi, e, false);
		else
			dev_dbg(dev, "Unable to delete aRFS entry, err %d fltr_state %d fltr_id %d flow_id %d Q %d\n",
				result, e->fltr_state, e->fltr_info.fltr_id,
				e->flow_id, e->fltr_info.q_index);

		/* The aRFS hash table is no longer referencing this entry */
		hlist_del(&e->list_entry);
		devm_kfree(dev, e);
	}
}

/**
 * ice_arfs_add_flow_rules - add the rules passed in from HW
 * @vsi: VSI for the flow rules that need to be added
 * @add_list_head: head of the list of ice_arfs_entry_ptr(s) for rule addition
 *
 * Loop through the add list passed in and remove the rules from HW. After each
 * rule is added, disconnect and free the ice_arfs_entry_ptr node. Don't free
 * the ice_arfs_entry(s) because they are still being referenced in the aRFS
 * hash table.
 */
static void
ice_arfs_add_flow_rules(struct ice_vsi *vsi, struct hlist_head *add_list_head)
{
	struct ice_arfs_entry_ptr *ep;
	struct hlist_node *n;
	struct device *dev;

	dev = ice_pf_to_dev(vsi->back);

	hlist_for_each_entry_safe(ep, n, add_list_head, list_entry) {
		int result;

		result = ice_fdir_write_fltr(vsi->back,
					     &ep->arfs_entry->fltr_info, true,
					     false);
		if (!result)
			ice_arfs_update_active_fltr_cntrs(vsi, ep->arfs_entry,
							  true);
		else
			dev_dbg(dev, "Unable to add aRFS entry, err %d fltr_state %d fltr_id %d flow_id %d Q %d\n",
				result, ep->arfs_entry->fltr_state,
				ep->arfs_entry->fltr_info.fltr_id,
				ep->arfs_entry->flow_id,
				ep->arfs_entry->fltr_info.q_index);

		hlist_del(&ep->list_entry);
		devm_kfree(dev, ep);
	}
}

/**
 * ice_arfs_is_flow_expired - check if the aRFS entry has expired
 * @vsi: VSI containing the aRFS entry
 * @arfs_entry: aRFS entry that's being checked for expiration
 *
 * Return true if the flow has expired, else false. This function should be used
 * to determine whether or not an aRFS entry should be removed from the hardware
 * and software structures.
 */
static bool
ice_arfs_is_flow_expired(struct ice_vsi *vsi, struct ice_arfs_entry *arfs_entry)
{
#define ICE_ARFS_TIME_DELTA_EXPIRATION	msecs_to_jiffies(5000)
	if (rps_may_expire_flow(vsi->netdev, arfs_entry->fltr_info.q_index,
				arfs_entry->flow_id,
				arfs_entry->fltr_info.fltr_id))
		return true;

	/* expiration timer only used for UDP filters */
	if (arfs_entry->fltr_info.flow_type != ICE_FLTR_PTYPE_NONF_IPV4_UDP &&
	    arfs_entry->fltr_info.flow_type != ICE_FLTR_PTYPE_NONF_IPV6_UDP)
		return false;

	return time_in_range64(arfs_entry->time_activated +
			       ICE_ARFS_TIME_DELTA_EXPIRATION,
			       arfs_entry->time_activated, get_jiffies_64());
}

/**
 * ice_arfs_update_flow_rules - add/delete aRFS rules in HW
 * @vsi: the VSI to be forwarded to
 * @idx: index into the table of aRFS filter lists. Obtained from skb->hash
 * @add_list: list to populate with filters to be added to Flow Director
 * @del_list: list to populate with filters to be deleted from Flow Director
 *
 * Iterate over the hlist at the index given in the aRFS hash table and
 * determine if there are any aRFS entries that need to be either added or
 * deleted in the HW. If the aRFS entry is marked as ICE_ARFS_INACTIVE the
 * filter needs to be added to HW, else if it's marked as ICE_ARFS_ACTIVE and
 * the flow has expired delete the filter from HW. The caller of this function
 * is expected to add/delete rules on the add_list/del_list respectively.
 */
static void
ice_arfs_update_flow_rules(struct ice_vsi *vsi, u16 idx,
			   struct hlist_head *add_list,
			   struct hlist_head *del_list)
{
	struct ice_arfs_entry *e;
	struct hlist_node *n;
	struct device *dev;

	dev = ice_pf_to_dev(vsi->back);

	/* go through the aRFS hlist at this idx and check for needed updates */
	hlist_for_each_entry_safe(e, n, &vsi->arfs_fltr_list[idx], list_entry)
		/* check if filter needs to be added to HW */
		if (e->fltr_state == ICE_ARFS_INACTIVE) {
			enum ice_fltr_ptype flow_type = e->fltr_info.flow_type;
			struct ice_arfs_entry_ptr *ep =
				devm_kzalloc(dev, sizeof(*ep), GFP_ATOMIC);

			if (!ep)
				continue;
			INIT_HLIST_NODE(&ep->list_entry);
			/* reference aRFS entry to add HW filter */
			ep->arfs_entry = e;
			hlist_add_head(&ep->list_entry, add_list);
			e->fltr_state = ICE_ARFS_ACTIVE;
			/* expiration timer only used for UDP flows */
			if (flow_type == ICE_FLTR_PTYPE_NONF_IPV4_UDP ||
			    flow_type == ICE_FLTR_PTYPE_NONF_IPV6_UDP)
				e->time_activated = get_jiffies_64();
		} else if (e->fltr_state == ICE_ARFS_ACTIVE) {
			/* check if filter needs to be removed from HW */
			if (ice_arfs_is_flow_expired(vsi, e)) {
				/* remove aRFS entry from hash table for delete
				 * and to prevent referencing it the next time
				 * through this hlist index
				 */
				hlist_del(&e->list_entry);
				e->fltr_state = ICE_ARFS_TODEL;
				/* save reference to aRFS entry for delete */
				hlist_add_head(&e->list_entry, del_list);
			}
		}
}

/**
 * ice_sync_arfs_fltrs - update all aRFS filters
 * @pf: board private structure
 */
void ice_sync_arfs_fltrs(struct ice_pf *pf)
{
	HLIST_HEAD(tmp_del_list);
	HLIST_HEAD(tmp_add_list);
	struct ice_vsi *pf_vsi;
	unsigned int i;

	pf_vsi = ice_get_main_vsi(pf);
	if (!pf_vsi)
		return;

	if (!ice_is_arfs_active(pf_vsi))
		return;

	spin_lock_bh(&pf_vsi->arfs_lock);
	/* Once we process aRFS for the PF VSI get out */
	for (i = 0; i < ICE_MAX_ARFS_LIST; i++)
		ice_arfs_update_flow_rules(pf_vsi, i, &tmp_add_list,
					   &tmp_del_list);
	spin_unlock_bh(&pf_vsi->arfs_lock);

	/* use list of ice_arfs_entry(s) for delete */
	ice_arfs_del_flow_rules(pf_vsi, &tmp_del_list);

	/* use list of ice_arfs_entry_ptr(s) for add */
	ice_arfs_add_flow_rules(pf_vsi, &tmp_add_list);
}

/**
 * ice_arfs_build_entry - builds an aRFS entry based on input
 * @vsi: destination VSI for this flow
 * @fk: flow dissector keys for creating the tuple
 * @rxq_idx: Rx queue to steer this flow to
 * @flow_id: passed down from the stack and saved for flow expiration
 *
 * returns an aRFS entry on success and NULL on failure
 */
static struct ice_arfs_entry *
ice_arfs_build_entry(struct ice_vsi *vsi, const struct flow_keys *fk,
		     u16 rxq_idx, u32 flow_id)
{
	struct ice_arfs_entry *arfs_entry;
	struct ice_fdir_fltr *fltr_info;
	u8 ip_proto;

	arfs_entry = devm_kzalloc(ice_pf_to_dev(vsi->back),
				  sizeof(*arfs_entry),
				  GFP_ATOMIC | __GFP_NOWARN);
	if (!arfs_entry)
		return NULL;

	fltr_info = &arfs_entry->fltr_info;
	fltr_info->q_index = rxq_idx;
	fltr_info->dest_ctl = ICE_FLTR_PRGM_DESC_DEST_DIRECT_PKT_QINDEX;
	fltr_info->dest_vsi = vsi->idx;
	ip_proto = fk->basic.ip_proto;

	if (fk->basic.n_proto == htons(ETH_P_IP)) {
		fltr_info->ip.v4.proto = ip_proto;
		fltr_info->flow_type = (ip_proto == IPPROTO_TCP) ?
			ICE_FLTR_PTYPE_NONF_IPV4_TCP :
			ICE_FLTR_PTYPE_NONF_IPV4_UDP;
		fltr_info->ip.v4.src_ip = fk->addrs.v4addrs.src;
		fltr_info->ip.v4.dst_ip = fk->addrs.v4addrs.dst;
		fltr_info->ip.v4.src_port = fk->ports.src;
		fltr_info->ip.v4.dst_port = fk->ports.dst;
	} else { /* ETH_P_IPV6 */
		fltr_info->ip.v6.proto = ip_proto;
		fltr_info->flow_type = (ip_proto == IPPROTO_TCP) ?
			ICE_FLTR_PTYPE_NONF_IPV6_TCP :
			ICE_FLTR_PTYPE_NONF_IPV6_UDP;
		memcpy(&fltr_info->ip.v6.src_ip, &fk->addrs.v6addrs.src,
		       sizeof(struct in6_addr));
		memcpy(&fltr_info->ip.v6.dst_ip, &fk->addrs.v6addrs.dst,
		       sizeof(struct in6_addr));
		fltr_info->ip.v6.src_port = fk->ports.src;
		fltr_info->ip.v6.dst_port = fk->ports.dst;
	}

	arfs_entry->flow_id = flow_id;
	fltr_info->fltr_id =
		atomic_inc_return(vsi->arfs_last_fltr_id) % RPS_NO_FILTER;

	return arfs_entry;
}

/**
 * ice_arfs_is_perfect_flow_set - Check to see if perfect flow is set
 * @hw: pointer to HW structure
 * @l3_proto: ETH_P_IP or ETH_P_IPV6 in network order
 * @l4_proto: IPPROTO_UDP or IPPROTO_TCP
 *
 * We only support perfect (4-tuple) filters for aRFS. This function allows aRFS
 * to check if perfect (4-tuple) flow rules are currently in place by Flow
 * Director.
 */
static bool
ice_arfs_is_perfect_flow_set(struct ice_hw *hw, __be16 l3_proto, u8 l4_proto)
{
	unsigned long *perfect_fltr = hw->fdir_perfect_fltr;

	/* advanced Flow Director disabled, perfect filters always supported */
	if (!perfect_fltr)
		return true;

	if (l3_proto == htons(ETH_P_IP) && l4_proto == IPPROTO_UDP)
		return test_bit(ICE_FLTR_PTYPE_NONF_IPV4_UDP, perfect_fltr);
	else if (l3_proto == htons(ETH_P_IP) && l4_proto == IPPROTO_TCP)
		return test_bit(ICE_FLTR_PTYPE_NONF_IPV4_TCP, perfect_fltr);
	else if (l3_proto == htons(ETH_P_IPV6) && l4_proto == IPPROTO_UDP)
		return test_bit(ICE_FLTR_PTYPE_NONF_IPV6_UDP, perfect_fltr);
	else if (l3_proto == htons(ETH_P_IPV6) && l4_proto == IPPROTO_TCP)
		return test_bit(ICE_FLTR_PTYPE_NONF_IPV6_TCP, perfect_fltr);

	return false;
}

/**
 * ice_rx_flow_steer - steer the Rx flow to where application is being run
 * @netdev: ptr to the netdev being adjusted
 * @skb: buffer with required header information
 * @rxq_idx: queue to which the flow needs to move
 * @flow_id: flow identifier provided by the netdev
 *
 * Based on the skb, rxq_idx, and flow_id passed in add/update an entry in the
 * aRFS hash table. Iterate over one of the hlists in the aRFS hash table and
 * if the flow_id already exists in the hash table but the rxq_idx has changed
 * mark the entry as ICE_ARFS_INACTIVE so it can get updated in HW, else
 * if the entry is marked as ICE_ARFS_TODEL delete it from the aRFS hash table.
 * If neither of the previous conditions are true then add a new entry in the
 * aRFS hash table, which gets set to ICE_ARFS_INACTIVE by default so it can be
 * added to HW.
 */
int
ice_rx_flow_steer(struct net_device *netdev, const struct sk_buff *skb,
		  u16 rxq_idx, u32 flow_id)
{
	struct ice_netdev_priv *np = netdev_priv(netdev);
	struct ice_arfs_entry *arfs_entry;
	struct ice_vsi *vsi = np->vsi;
	struct flow_keys fk;
	struct ice_pf *pf;
	__be16 n_proto;
	u8 ip_proto;
	u16 idx;
	int ret;

	/* failed to allocate memory for aRFS so don't crash */
	if (unlikely(!vsi->arfs_fltr_list))
		return -ENODEV;

	pf = vsi->back;

	if (skb->encapsulation)
		return -EPROTONOSUPPORT;

	if (!skb_flow_dissect_flow_keys(skb, &fk, 0))
		return -EPROTONOSUPPORT;

	n_proto = fk.basic.n_proto;
	/* Support only IPV4 and IPV6 */
	if ((n_proto == htons(ETH_P_IP) && !ip_is_fragment(ip_hdr(skb))) ||
	    n_proto == htons(ETH_P_IPV6))
		ip_proto = fk.basic.ip_proto;
	else
		return -EPROTONOSUPPORT;

	/* Support only TCP and UDP */
	if (ip_proto != IPPROTO_TCP && ip_proto != IPPROTO_UDP)
		return -EPROTONOSUPPORT;

	/* only support 4-tuple filters for aRFS */
	if (!ice_arfs_is_perfect_flow_set(&pf->hw, n_proto, ip_proto))
		return -EOPNOTSUPP;

	/* choose the aRFS list bucket based on skb hash */
	idx = skb_get_hash_raw(skb) & ICE_ARFS_LST_MASK;
	/* search for entry in the bucket */
	spin_lock_bh(&vsi->arfs_lock);
	hlist_for_each_entry(arfs_entry, &vsi->arfs_fltr_list[idx],
			     list_entry) {
		struct ice_fdir_fltr *fltr_info;

		/* keep searching for the already existing arfs_entry flow */
		if (arfs_entry->flow_id != flow_id)
			continue;

		fltr_info = &arfs_entry->fltr_info;
		ret = fltr_info->fltr_id;

		if (fltr_info->q_index == rxq_idx ||
		    arfs_entry->fltr_state != ICE_ARFS_ACTIVE)
			goto out;

		/* update the queue to forward to on an already existing flow */
		fltr_info->q_index = rxq_idx;
		arfs_entry->fltr_state = ICE_ARFS_INACTIVE;
		ice_arfs_update_active_fltr_cntrs(vsi, arfs_entry, false);
		goto out_schedule_service_task;
	}

	arfs_entry = ice_arfs_build_entry(vsi, &fk, rxq_idx, flow_id);
	if (!arfs_entry) {
		ret = -ENOMEM;
		goto out;
	}

	ret = arfs_entry->fltr_info.fltr_id;
	INIT_HLIST_NODE(&arfs_entry->list_entry);
	hlist_add_head(&arfs_entry->list_entry, &vsi->arfs_fltr_list[idx]);
out_schedule_service_task:
	ice_service_task_schedule(pf);
out:
	spin_unlock_bh(&vsi->arfs_lock);
	return ret;
}

/**
 * ice_init_arfs_cntrs - initialize aRFS counter values
 * @vsi: VSI that aRFS counters need to be initialized on
 */
static int ice_init_arfs_cntrs(struct ice_vsi *vsi)
{
	if (!vsi || vsi->type != ICE_VSI_PF)
		return -EINVAL;

	vsi->arfs_fltr_cntrs = kzalloc(sizeof(*vsi->arfs_fltr_cntrs),
				       GFP_KERNEL);
	if (!vsi->arfs_fltr_cntrs)
		return -ENOMEM;

	vsi->arfs_last_fltr_id = kzalloc(sizeof(*vsi->arfs_last_fltr_id),
					 GFP_KERNEL);
	if (!vsi->arfs_last_fltr_id) {
		kfree(vsi->arfs_fltr_cntrs);
		vsi->arfs_fltr_cntrs = NULL;
		return -ENOMEM;
	}

	return 0;
}

/**
 * ice_init_arfs - initialize aRFS resources
 * @vsi: the VSI to be forwarded to
 */
void ice_init_arfs(struct ice_vsi *vsi)
{
	struct hlist_head *arfs_fltr_list;
	unsigned int i;

	if (!vsi || vsi->type != ICE_VSI_PF)
		return;

	arfs_fltr_list = kzalloc(sizeof(*arfs_fltr_list) * ICE_MAX_ARFS_LIST,
				 GFP_KERNEL);
	if (!arfs_fltr_list)
		return;

	if (ice_init_arfs_cntrs(vsi))
		goto free_arfs_fltr_list;

	for (i = 0; i < ICE_MAX_ARFS_LIST; i++)
		INIT_HLIST_HEAD(&arfs_fltr_list[i]);

	spin_lock_init(&vsi->arfs_lock);

	vsi->arfs_fltr_list = arfs_fltr_list;

	return;

free_arfs_fltr_list:
	kfree(arfs_fltr_list);
}

/**
 * ice_clear_arfs - clear the aRFS hash table and any memory used for aRFS
 * @vsi: the VSI to be forwarded to
 */
void ice_clear_arfs(struct ice_vsi *vsi)
{
	struct device *dev;
	unsigned int i;

	if (!vsi || vsi->type != ICE_VSI_PF || !vsi->back ||
	    !vsi->arfs_fltr_list)
		return;

	dev = ice_pf_to_dev(vsi->back);
	for (i = 0; i < ICE_MAX_ARFS_LIST; i++) {
		struct ice_arfs_entry *r;
		struct hlist_node *n;

		spin_lock_bh(&vsi->arfs_lock);
		hlist_for_each_entry_safe(r, n, &vsi->arfs_fltr_list[i],
					  list_entry) {
			hlist_del(&r->list_entry);
			devm_kfree(dev, r);
		}
		spin_unlock_bh(&vsi->arfs_lock);
	}

	kfree(vsi->arfs_fltr_list);
	vsi->arfs_fltr_list = NULL;
	kfree(vsi->arfs_last_fltr_id);
	vsi->arfs_last_fltr_id = NULL;
	kfree(vsi->arfs_fltr_cntrs);
	vsi->arfs_fltr_cntrs = NULL;
}

/**
 * ice_free_cpu_rx_rmap - free setup CPU reverse map
 * @vsi: the VSI to be forwarded to
 */
void ice_free_cpu_rx_rmap(struct ice_vsi *vsi)
{
	struct net_device *netdev;

	if (!vsi || vsi->type != ICE_VSI_PF || !vsi->arfs_fltr_list)
		return;

	netdev = vsi->netdev;
	if (!netdev || !netdev->rx_cpu_rmap ||
	    netdev->reg_state != NETREG_REGISTERED)
		return;

	free_irq_cpu_rmap(netdev->rx_cpu_rmap);
	netdev->rx_cpu_rmap = NULL;
}

/**
 * ice_set_cpu_rx_rmap - setup CPU reverse map for each queue
 * @vsi: the VSI to be forwarded to
 */
int ice_set_cpu_rx_rmap(struct ice_vsi *vsi)
{
	struct net_device *netdev;
	struct ice_pf *pf;
	int base_idx, i;

	if (!vsi || vsi->type != ICE_VSI_PF)
		return -EINVAL;

	pf = vsi->back;
	netdev = vsi->netdev;
	if (!pf || !netdev || !vsi->num_q_vectors ||
	    vsi->netdev->reg_state != NETREG_REGISTERED)
		return -EINVAL;

	netdev_dbg(netdev, "Setup CPU RMAP: vsi type 0x%x, ifname %s, q_vectors %d\n",
		   vsi->type, netdev->name, vsi->num_q_vectors);

	netdev->rx_cpu_rmap = alloc_irq_cpu_rmap(vsi->num_q_vectors);
	if (unlikely(!netdev->rx_cpu_rmap))
		return -EINVAL;

	base_idx = vsi->base_vector;
	for (i = 0; i < vsi->num_q_vectors; i++)
		if (irq_cpu_rmap_add(netdev->rx_cpu_rmap,
				     pf->msix_entries[base_idx + i].vector)) {
			ice_free_cpu_rx_rmap(vsi);
			return -EINVAL;
		}

	return 0;
}

/**
 * ice_remove_arfs - remove/clear all aRFS resources
 * @pf: device private structure
 */
void ice_remove_arfs(struct ice_pf *pf)
{
	struct ice_vsi *pf_vsi;

	pf_vsi = ice_get_main_vsi(pf);
	if (!pf_vsi)
		return;

	ice_free_cpu_rx_rmap(pf_vsi);
	ice_clear_arfs(pf_vsi);
}

/**
 * ice_rebuild_arfs - remove/clear all aRFS resources and rebuild after reset
 * @pf: device private structure
 */
void ice_rebuild_arfs(struct ice_pf *pf)
{
	struct ice_vsi *pf_vsi;

	pf_vsi = ice_get_main_vsi(pf);
	if (!pf_vsi)
		return;

	ice_remove_arfs(pf);
	if (ice_set_cpu_rx_rmap(pf_vsi)) {
		dev_err(ice_pf_to_dev(pf), "Failed to rebuild aRFS\n");
		return;
	}
	ice_init_arfs(pf_vsi);
}