aboutsummaryrefslogtreecommitdiffstats
path: root/src/vnet/dev/port.c
blob: 0363ea41b4826609693a589eac4228add13e9d05 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
/* SPDX-License-Identifier: Apache-2.0
 * Copyright (c) 2023 Cisco Systems, Inc.
 */

#include <vnet/vnet.h>
#include <vnet/ethernet/ethernet.h>
#include <vnet/dev/dev.h>
#include <vnet/dev/counters.h>
#include <vnet/dev/log.h>

VLIB_REGISTER_LOG_CLASS (dev_log, static) = {
  .class_name = "dev",
  .subclass_name = "port",
};

static uword
dummy_input_fn (vlib_main_t *vm, vlib_node_runtime_t *node,
		vlib_frame_t *frame)
{
  ASSERT (0);
  return 0;
}

VLIB_REGISTER_NODE (port_rx_eth_node) = {
  .function = dummy_input_fn,
  .name = "port-rx-eth",
  .runtime_data_bytes = sizeof (vnet_dev_rx_node_runtime_t),
  .type = VLIB_NODE_TYPE_INPUT,
  .state = VLIB_NODE_STATE_DISABLED,
  .n_next_nodes = VNET_DEV_ETH_RX_PORT_N_NEXTS,
  .next_nodes = {
#define _(n, s) [VNET_DEV_ETH_RX_PORT_NEXT_##n] = s,
  foreach_vnet_dev_port_rx_next
#undef _
  },
};

u16 vnet_dev_default_next_index_by_port_type[] = {
  [VNET_DEV_PORT_TYPE_ETHERNET] = VNET_DEV_ETH_RX_PORT_NEXT_ETH_INPUT,
};

VNET_FEATURE_ARC_INIT (eth_port_rx, static) = {
  .arc_name = "port-rx-eth",
  .start_nodes = VNET_FEATURES ("port-rx-eth"),
  .last_in_arc = "ethernet-input",
  .arc_index_ptr = &vnet_dev_main.eth_port_rx_feature_arc_index,
};

VNET_FEATURE_INIT (l2_patch, static) = {
  .arc_name = "port-rx-eth",
  .node_name = "l2-patch",
  .runs_before = VNET_FEATURES ("ethernet-input"),
};

VNET_FEATURE_INIT (worker_handoff, static) = {
  .arc_name = "port-rx-eth",
  .node_name = "worker-handoff",
  .runs_before = VNET_FEATURES ("ethernet-input"),
};

VNET_FEATURE_INIT (span_input, static) = {
  .arc_name = "port-rx-eth",
  .node_name = "span-input",
  .runs_before = VNET_FEATURES ("ethernet-input"),
};

VNET_FEATURE_INIT (p2p_ethernet_node, static) = {
  .arc_name = "port-rx-eth",
  .node_name = "p2p-ethernet-input",
  .runs_before = VNET_FEATURES ("ethernet-input"),
};

VNET_FEATURE_INIT (ethernet_input, static) = {
  .arc_name = "port-rx-eth",
  .node_name = "ethernet-input",
  .runs_before = 0, /* not before any other features */
};

void
vnet_dev_port_free (vlib_main_t *vm, vnet_dev_port_t *port)
{
  vnet_dev_t *dev = port->dev;

  vnet_dev_port_validate (vm, port);

  ASSERT (port->started == 0);

  log_debug (dev, "port %u", port->port_id);

  if (port->port_ops.free)
    port->port_ops.free (vm, port);

  pool_free (port->secondary_hw_addr);
  pool_free (port->rx_queues);
  pool_free (port->tx_queues);
  vnet_dev_arg_free (&port->args);
  pool_put_index (dev->ports, port->index);
  clib_mem_free (port);
}

void
vnet_dev_port_update_tx_node_runtime (vlib_main_t *vm, vnet_dev_port_t *port)
{
  vnet_dev_port_validate (vm, port);

  foreach_vnet_dev_port_tx_queue (q, port)
    {
      u32 ti;
      clib_bitmap_foreach (ti, q->assigned_threads)
	{
	  vlib_main_t *tvm = vlib_get_main_by_index (ti);
	  vlib_node_runtime_t *nr =
	    vlib_node_get_runtime (tvm, port->intf.tx_node_index);
	  vnet_dev_tx_node_runtime_t *tnr = vnet_dev_get_tx_node_runtime (nr);
	  tnr->hw_if_index = port->intf.hw_if_index;
	  tnr->tx_queue = q;
	}
    }
}

void
vnet_dev_port_stop (vlib_main_t *vm, vnet_dev_port_t *port)
{
  vnet_dev_t *dev = port->dev;
  vnet_dev_rt_op_t *ops = 0;
  u16 n_threads = vlib_get_n_threads ();

  log_debug (dev, "stopping port %u", port->port_id);

  for (u16 i = 0; i < n_threads; i++)
    {
      vnet_dev_rt_op_t op = { .thread_index = i, .port = port };
      vec_add1 (ops, op);
    }

  vnet_dev_rt_exec_ops (vm, dev, ops, vec_len (ops));
  vec_free (ops);

  port->port_ops.stop (vm, port);

  foreach_vnet_dev_port_rx_queue (q, port)
    {
      q->started = 0;
      log_debug (dev, "port %u rx queue %u stopped", port->port_id,
		 q->queue_id);
    }

  foreach_vnet_dev_port_tx_queue (q, port)
    {
      q->started = 0;
      log_debug (dev, "port %u tx queue %u stopped", port->port_id,
		 q->queue_id);
    }

  log_debug (dev, "port %u stopped", port->port_id);
  port->started = 0;
}

vnet_dev_rv_t
vnet_dev_port_start_all_rx_queues (vlib_main_t *vm, vnet_dev_port_t *port)
{
  vnet_dev_rv_t rv = VNET_DEV_OK;

  vnet_dev_port_validate (vm, port);

  foreach_vnet_dev_port_rx_queue (q, port)
    {
      rv = vnet_dev_rx_queue_start (vm, q);
      if (rv != VNET_DEV_OK)
	return rv;
    }
  return rv;
}

vnet_dev_rv_t
vnet_dev_port_start_all_tx_queues (vlib_main_t *vm, vnet_dev_port_t *port)
{
  vnet_dev_rv_t rv = VNET_DEV_OK;

  vnet_dev_port_validate (vm, port);

  foreach_vnet_dev_port_tx_queue (q, port)
    {
      rv = vnet_dev_tx_queue_start (vm, q);
      if (rv != VNET_DEV_OK)
	return rv;
    }
  return rv;
}

vnet_dev_rv_t
vnet_dev_port_start (vlib_main_t *vm, vnet_dev_port_t *port)
{
  u16 n_threads = vlib_get_n_threads ();
  vnet_dev_t *dev = port->dev;
  vnet_dev_rt_op_t *ops = 0;
  vnet_dev_rv_t rv;

  vnet_dev_port_validate (vm, port);

  log_debug (dev, "starting port %u", port->port_id);

  vnet_dev_port_update_tx_node_runtime (vm, port);

  if ((rv = port->port_ops.start (vm, port)) != VNET_DEV_OK)
    {
      vnet_dev_port_stop (vm, port);
      return rv;
    }

  for (u16 i = 0; i < n_threads; i++)
    {
      vnet_dev_rt_op_t op = { .thread_index = i, .port = port };
      vec_add1 (ops, op);
    }

  vnet_dev_rt_exec_ops (vm, dev, ops, vec_len (ops));
  vec_free (ops);

  foreach_vnet_dev_port_rx_queue (q, port)
    if (q->enabled)
      {
	log_debug (dev, "port %u rx queue %u started", port->port_id,
		   q->queue_id);
	q->started = 1;
      }

  foreach_vnet_dev_port_tx_queue (q, port)
    if (q->enabled)
      {
	log_debug (dev, "port %u tx queue %u started", port->port_id,
		   q->queue_id);
	q->started = 1;
      }

  port->started = 1;
  log_debug (dev, "port %u started", port->port_id);

  return VNET_DEV_OK;
}

vnet_dev_rv_t
vnet_dev_port_add (vlib_main_t *vm, vnet_dev_t *dev, vnet_dev_port_id_t id,
		   vnet_dev_port_add_args_t *args)
{
  vnet_dev_port_t **pp, *port;
  vnet_dev_rv_t rv = VNET_DEV_OK;

  ASSERT (args->port.attr.type != VNET_DEV_PORT_TYPE_UNKNOWN);
  ASSERT (args->port.attr.max_supported_rx_frame_size);

  port =
    vnet_dev_alloc_with_data (sizeof (vnet_dev_port_t), args->port.data_size);
  pool_get (dev->ports, pp);
  pp[0] = port;
  clib_memcpy (vnet_dev_get_port_data (port), args->port.initial_data,
	       args->port.data_size);
  port->port_id = id;
  port->index = pp - dev->ports;
  port->dev = dev;
  port->attr = args->port.attr;
  port->rx_queue_config = args->rx_queue.config;
  port->tx_queue_config = args->tx_queue.config;
  port->rx_queue_ops = args->rx_queue.ops;
  port->tx_queue_ops = args->tx_queue.ops;
  port->port_ops = args->port.ops;
  port->rx_node = *args->rx_node;
  port->tx_node = *args->tx_node;

  if (args->port.args)
    for (vnet_dev_arg_t *a = args->port.args; a->type != VNET_DEV_ARG_END; a++)
      vec_add1 (port->args, *a);

  /* defaults out of port attributes */
  port->max_rx_frame_size = args->port.attr.max_supported_rx_frame_size;
  port->primary_hw_addr = args->port.attr.hw_addr;

  if (port->attr.type == VNET_DEV_PORT_TYPE_ETHERNET)
    {
      if (port->max_rx_frame_size > 1514 &&
	  port->attr.caps.change_max_rx_frame_size)
	port->max_rx_frame_size = 1514;
    }

  if (port->port_ops.alloc)
    rv = port->port_ops.alloc (vm, port);

  if (rv == VNET_DEV_OK)
    port->initialized = 1;

  return rv;
}

vnet_dev_rv_t
vnet_dev_port_cfg_change_req_validate (vlib_main_t *vm, vnet_dev_port_t *port,
				       vnet_dev_port_cfg_change_req_t *req)
{
  vnet_dev_rv_t rv;
  vnet_dev_hw_addr_t *addr;
  int found;

  if (req->validated)
    return VNET_DEV_OK;

  switch (req->type)
    {
    case VNET_DEV_PORT_CFG_MAX_RX_FRAME_SIZE:
      if (req->max_rx_frame_size > port->attr.max_supported_rx_frame_size)
	return VNET_DEV_ERR_INVALID_VALUE;
      if (req->max_rx_frame_size == port->max_rx_frame_size)
	return VNET_DEV_ERR_NO_CHANGE;
      break;

    case VNET_DEV_PORT_CFG_PROMISC_MODE:
      if (req->promisc == port->promisc)
	return VNET_DEV_ERR_NO_CHANGE;
      break;

    case VNET_DEV_PORT_CFG_CHANGE_PRIMARY_HW_ADDR:
      if (clib_memcmp (&req->addr, &port->primary_hw_addr,
		       sizeof (vnet_dev_hw_addr_t)) == 0)
	return VNET_DEV_ERR_NO_CHANGE;
      break;

    case VNET_DEV_PORT_CFG_ADD_SECONDARY_HW_ADDR:
      pool_foreach (addr, port->secondary_hw_addr)
	if (clib_memcmp (addr, &req->addr, sizeof (*addr)) == 0)
	  return VNET_DEV_ERR_ALREADY_EXISTS;
      break;

    case VNET_DEV_PORT_CFG_REMOVE_SECONDARY_HW_ADDR:
      found = 0;
      pool_foreach (addr, port->secondary_hw_addr)
	if (clib_memcmp (addr, &req->addr, sizeof (*addr)) == 0)
	  found = 1;
      if (!found)
	return VNET_DEV_ERR_NO_SUCH_ENTRY;
      break;

    default:
      break;
    }

  if (port->port_ops.config_change_validate)
    {
      rv = port->port_ops.config_change_validate (vm, port, req);
      if (rv != VNET_DEV_OK)
	return rv;
    }
  else
    return VNET_DEV_ERR_NOT_SUPPORTED;

  req->validated = 1;
  return VNET_DEV_OK;
}

vnet_dev_rv_t
vnet_dev_port_cfg_change (vlib_main_t *vm, vnet_dev_port_t *port,
			  vnet_dev_port_cfg_change_req_t *req)
{
  vnet_dev_rv_t rv = VNET_DEV_OK;
  vnet_dev_hw_addr_t *a;
  vnet_dev_rx_queue_t *rxq = 0;
  u8 enable = 0;

  vnet_dev_port_validate (vm, port);

  if (req->type == VNET_DEV_PORT_CFG_RXQ_INTR_MODE_ENABLE ||
      req->type == VNET_DEV_PORT_CFG_RXQ_INTR_MODE_DISABLE)
    {
      if (req->all_queues == 0)
	{
	  rxq = vnet_dev_port_get_rx_queue_by_id (port, req->queue_id);
	  if (rxq == 0)
	    return VNET_DEV_ERR_BUG;
	}
    }

  if ((rv = vnet_dev_port_cfg_change_req_validate (vm, port, req)))
    return rv;

  if (port->port_ops.config_change)
    rv = port->port_ops.config_change (vm, port, req);
  else
    return VNET_DEV_ERR_NOT_SUPPORTED;

  if (rv != VNET_DEV_OK)
    return rv;

  switch (req->type)
    {
    case VNET_DEV_PORT_CFG_MAX_RX_FRAME_SIZE:
      port->max_rx_frame_size = req->max_rx_frame_size;
      break;

    case VNET_DEV_PORT_CFG_PROMISC_MODE:
      port->promisc = req->promisc;
      break;

    case VNET_DEV_PORT_CFG_RXQ_INTR_MODE_ENABLE:
      enable = 1;
    case VNET_DEV_PORT_CFG_RXQ_INTR_MODE_DISABLE:
      if (req->all_queues)
	{
	  clib_bitmap_t *bmp = 0;
	  vnet_dev_rt_op_t *ops = 0;
	  u32 i;

	  foreach_vnet_dev_port_rx_queue (q, port)
	    {
	      q->interrupt_mode = enable;
	      bmp = clib_bitmap_set (bmp, q->rx_thread_index, 1);
	    }

	  clib_bitmap_foreach (i, bmp)
	    {
	      vnet_dev_rt_op_t op = { .port = port, .thread_index = i };
	      vec_add1 (ops, op);
	    }

	  vnet_dev_rt_exec_ops (vm, port->dev, ops, vec_len (ops));
	  clib_bitmap_free (bmp);
	  vec_free (ops);
	}
      else
	{
	  rxq->interrupt_mode = enable;
	  vnet_dev_rt_exec_ops (vm, port->dev,
				&(vnet_dev_rt_op_t){
				  .port = port,
				  .thread_index = rxq->rx_thread_index,
				},
				1);
	}
      break;

    case VNET_DEV_PORT_CFG_CHANGE_PRIMARY_HW_ADDR:
      clib_memcpy (&port->primary_hw_addr, &req->addr,
		   sizeof (vnet_dev_hw_addr_t));
      break;

    case VNET_DEV_PORT_CFG_ADD_SECONDARY_HW_ADDR:
      pool_get (port->secondary_hw_addr, a);
      clib_memcpy (a, &req->addr, sizeof (vnet_dev_hw_addr_t));
      break;

    case VNET_DEV_PORT_CFG_REMOVE_SECONDARY_HW_ADDR:
      pool_foreach (a, port->secondary_hw_addr)
	if (clib_memcmp (a, &req->addr, sizeof (vnet_dev_hw_addr_t)) == 0)
	  {
	    pool_put (port->secondary_hw_addr, a);
	    break;
	  }
      break;

    default:
      break;
    }

  return VNET_DEV_OK;
}

void
vnet_dev_port_state_change (vlib_main_t *vm, vnet_dev_port_t *port,
			    vnet_dev_port_state_changes_t changes)
{
  vnet_main_t *vnm = vnet_get_main ();

  vnet_dev_port_validate (vm, port);

  if (changes.change.link_speed)
    {
      port->speed = changes.link_speed;
      if (port->interface_created)
	vnet_hw_interface_set_link_speed (vnm, port->intf.hw_if_index,
					  changes.link_speed);
      log_debug (port->dev, "port speed changed to %u", changes.link_speed);
    }

  if (changes.change.link_state)
    {
      port->link_up = changes.link_state;
      if (port->interface_created)
	vnet_hw_interface_set_flags (
	  vnm, port->intf.hw_if_index,
	  changes.link_state ? VNET_HW_INTERFACE_FLAG_LINK_UP : 0);
      log_debug (port->dev, "port link state changed to %s",
		 changes.link_state ? "up" : "down");
    }
}

void
vnet_dev_port_add_counters (vlib_main_t *vm, vnet_dev_port_t *port,
			    vnet_dev_counter_t *counters, u16 n_counters)
{
  vnet_dev_port_validate (vm, port);

  port->counter_main =
    vnet_dev_counters_alloc (vm, counters, n_counters, "%s port %u counters",
			     port->dev->device_id, port->port_id);
}

void
vnet_dev_port_free_counters (vlib_main_t *vm, vnet_dev_port_t *port)
{
  vnet_dev_port_validate (vm, port);

  if (port->counter_main)
    vnet_dev_counters_free (vm, port->counter_main);
}

vnet_dev_rv_t
vnet_dev_port_if_create (vlib_main_t *vm, vnet_dev_port_t *port)
{
  vnet_main_t *vnm = vnet_get_main ();
  u16 n_threads = vlib_get_n_threads ();
  vnet_dev_main_t *dm = &vnet_dev_main;
  vnet_dev_t *dev = port->dev;
  vnet_dev_port_t **pp;
  vnet_dev_rv_t rv;
  u16 ti = 0;

  if (port->intf.name[0] == 0)
    {
      u8 *s;
      s = format (0, "%s%u/%u",
		  dm->drivers[port->dev->driver_index].registration->name,
		  port->dev->index, port->index);
      u32 n = vec_len (s);

      if (n >= sizeof (port->intf.name))
	{
	  vec_free (s);
	  return VNET_DEV_ERR_BUG;
	}
      clib_memcpy (port->intf.name, s, n);
      port->intf.name[n] = 0;
      vec_free (s);
    }

  log_debug (
    dev, "allocating %u rx queues with size %u and %u tx queues with size %u",
    port->intf.num_rx_queues, port->intf.rxq_sz, port->intf.num_tx_queues,
    port->intf.txq_sz);

  for (int i = 0; i < port->intf.num_rx_queues; i++)
    if ((rv = vnet_dev_rx_queue_alloc (vm, port, port->intf.rxq_sz)) !=
	VNET_DEV_OK)
      goto error;

  for (u32 i = 0; i < port->intf.num_tx_queues; i++)
    if ((rv = vnet_dev_tx_queue_alloc (vm, port, port->intf.txq_sz)) !=
	VNET_DEV_OK)
      goto error;

  foreach_vnet_dev_port_tx_queue (q, port)
    {
      q->assigned_threads = clib_bitmap_set (q->assigned_threads, ti, 1);
      log_debug (dev, "port %u tx queue %u assigned to thread %u",
		 port->port_id, q->queue_id, ti);
      if (++ti >= n_threads)
	break;
    }

  /* pool of port pointers helps us to assign unique dev_instance */
  pool_get (dm->ports_by_dev_instance, pp);
  port->intf.dev_instance = pp - dm->ports_by_dev_instance;
  pp[0] = port;

  if (port->attr.type == VNET_DEV_PORT_TYPE_ETHERNET)
    {
      vnet_device_class_t *dev_class;
      vnet_dev_driver_t *driver;
      vnet_sw_interface_t *sw;
      vnet_hw_interface_t *hw;
      u32 rx_node_index;

      driver = pool_elt_at_index (dm->drivers, dev->driver_index);

      /* hack to provide per-port tx node function */
      dev_class = vnet_get_device_class (vnm, driver->dev_class_index);
      dev_class->tx_fn_registrations = port->tx_node.registrations;
      dev_class->format_tx_trace = port->tx_node.format_trace;
      dev_class->tx_function_error_counters = port->tx_node.error_counters;
      dev_class->tx_function_n_errors = port->tx_node.n_error_counters;

      /* create new interface including tx and output nodes */
      port->intf.hw_if_index = vnet_eth_register_interface (
	vnm, &(vnet_eth_interface_registration_t){
	       .address = port->primary_hw_addr.eth_mac,
	       .max_frame_size = port->max_rx_frame_size,
	       .dev_class_index = driver->dev_class_index,
	       .dev_instance = port->intf.dev_instance,
	       .cb.set_max_frame_size = vnet_dev_port_set_max_frame_size,
	       .cb.flag_change = vnet_dev_port_eth_flag_change,
	     });

      sw = vnet_get_hw_sw_interface (vnm, port->intf.hw_if_index);
      hw = vnet_get_hw_interface (vnm, port->intf.hw_if_index);
      port->intf.sw_if_index = sw->sw_if_index;
      vnet_hw_interface_set_flags (
	vnm, port->intf.hw_if_index,
	port->link_up ? VNET_HW_INTERFACE_FLAG_LINK_UP : 0);
      if (port->speed)
	vnet_hw_interface_set_link_speed (vnm, port->intf.hw_if_index,
					  port->speed);

      port->intf.tx_node_index = hw->tx_node_index;

      /* create / reuse rx node */
      if (vec_len (dm->free_rx_node_indices))
	{
	  vlib_node_t *n;
	  rx_node_index = vec_pop (dm->free_rx_node_indices);
	  vlib_node_rename (vm, rx_node_index, "%s-rx", port->intf.name);
	  n = vlib_get_node (vm, rx_node_index);
	  n->function = vlib_node_get_preferred_node_fn_variant (
	    vm, port->rx_node.registrations);
	  n->format_trace = port->rx_node.format_trace;
	  vlib_register_errors (vm, rx_node_index,
				port->rx_node.n_error_counters, 0,
				port->rx_node.error_counters);
	}
      else
	{
	  dev_class->format_tx_trace = port->tx_node.format_trace;
	  dev_class->tx_function_error_counters = port->tx_node.error_counters;
	  dev_class->tx_function_n_errors = port->tx_node.n_error_counters;
	  vlib_node_registration_t rx_node_reg = {
	    .sibling_of = "port-rx-eth",
	    .type = VLIB_NODE_TYPE_INPUT,
	    .state = VLIB_NODE_STATE_DISABLED,
	    .flags = VLIB_NODE_FLAG_TRACE_SUPPORTED,
	    .node_fn_registrations = port->rx_node.registrations,
	    .format_trace = port->rx_node.format_trace,
	    .error_counters = port->rx_node.error_counters,
	    .n_errors = port->rx_node.n_error_counters,
	  };
	  rx_node_index =
	    vlib_register_node (vm, &rx_node_reg, "%s-rx", port->intf.name);
	}
      port->rx_node_assigned = 1;
      port->intf.rx_node_index = rx_node_index;
      port->intf.rx_next_index =
	vnet_dev_default_next_index_by_port_type[port->attr.type];

      vlib_worker_thread_node_runtime_update ();
      log_debug (dev,
		 "ethernet interface created, hw_if_index %u sw_if_index %u "
		 "rx_node_index %u tx_node_index %u",
		 port->intf.hw_if_index, port->intf.sw_if_index,
		 port->intf.rx_node_index, port->intf.tx_node_index);
    }

  port->interface_created = 1;
  foreach_vnet_dev_port_rx_queue (q, port)
    {
      vnet_buffer (&q->buffer_template)->sw_if_index[VLIB_RX] =
	port->intf.sw_if_index;
      /* poison to catch node not calling runtime update function */
      q->next_index = ~0;
      q->interrupt_mode = port->intf.default_is_intr_mode;
      vnet_dev_rx_queue_rt_request (
	vm, q, (vnet_dev_rx_queue_rt_req_t){ .update_next_index = 1 });
    }

  vnet_dev_port_update_tx_node_runtime (vm, port);

  if (port->port_ops.init)
    rv = port->port_ops.init (vm, port);

error:
  if (rv != VNET_DEV_OK)
    vnet_dev_port_if_remove (vm, port);
  return rv;
}

vnet_dev_rv_t
vnet_dev_port_if_remove (vlib_main_t *vm, vnet_dev_port_t *port)
{
  vnet_dev_main_t *dm = &vnet_dev_main;
  vnet_main_t *vnm = vnet_get_main ();

  vnet_dev_port_validate (vm, port);

  if (port->started)
    vnet_dev_port_stop (vm, port);

  if (port->rx_node_assigned)
    {
      vlib_node_rename (vm, port->intf.rx_node_index, "deleted-%u",
			port->intf.rx_node_index);
      vec_add1 (dm->free_rx_node_indices, port->intf.rx_node_index);
      port->rx_node_assigned = 0;
    }

  if (port->interface_created)
    {
      vlib_worker_thread_barrier_sync (vm);
      vnet_delete_hw_interface (vnm, port->intf.hw_if_index);
      vlib_worker_thread_barrier_release (vm);
      pool_put_index (dm->ports_by_dev_instance, port->intf.dev_instance);
      port->interface_created = 0;
    }

  port->intf = (typeof (port->intf)){};

  if (port->port_ops.deinit)
    port->port_ops.deinit (vm, port);

  foreach_vnet_dev_port_tx_queue (q, port)
    vnet_dev_tx_queue_free (vm, q);

  foreach_vnet_dev_port_rx_queue (q, port)
    vnet_dev_rx_queue_free (vm, q);

  vnet_dev_port_free_counters (vm, port);

  foreach_vnet_dev_port_args (v, port)
    vnet_dev_arg_clear_value (v);

  return VNET_DEV_OK;
}
void
vnet_dev_port_clear_counters (vlib_main_t *vm, vnet_dev_port_t *port)
{
  if (port->counter_main)
    vnet_dev_counters_clear (vm, port->counter_main);

  foreach_vnet_dev_port_rx_queue (q, port)
    if (q->counter_main)
      vnet_dev_counters_clear (vm, q->counter_main);

  foreach_vnet_dev_port_tx_queue (q, port)
    if (q->counter_main)
      vnet_dev_counters_clear (vm, q->counter_main);

  log_notice (port->dev, "counters cleared on port %u", port->port_id);
}