summaryrefslogtreecommitdiffstats
path: root/src/vnet/interface/runtime.c
blob: 019d3ee28d095c2aa4b45f07f85dae660ce985e4 (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
/*
 * Copyright (c) 2020 Cisco and/or its affiliates.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <vnet/vnet.h>
#include <vnet/devices/devices.h>
#include <vnet/feature/feature.h>
#include <vnet/ip/ip.h>
#include <vnet/ethernet/ethernet.h>
#include <vnet/interface/rx_queue_funcs.h>
#include <vlib/unix/unix.h>

VLIB_REGISTER_LOG_CLASS (if_rxq_log, static) = {
  .class_name = "interface",
  .subclass_name = "runtime",
};

#define log_debug(fmt, ...) vlib_log_debug (if_rxq_log.class, fmt, __VA_ARGS__)
#define log_err(fmt, ...)   vlib_log_err (if_rxq_log.class, fmt, __VA_ARGS__)

static char *node_state_str[] = {
  [VLIB_NODE_STATE_DISABLED] = "disabled",
  [VLIB_NODE_STATE_POLLING] = "polling",
  [VLIB_NODE_STATE_INTERRUPT] = "interrupt",
};

static int
poll_data_sort (void *a1, void *a2)
{
  vnet_hw_if_rxq_poll_vector_t *pv1 = a1;
  vnet_hw_if_rxq_poll_vector_t *pv2 = a2;

  if (pv1->dev_instance > pv2->dev_instance)
    return 1;
  else if (pv1->dev_instance < pv2->dev_instance)
    return -1;
  else if (pv1->queue_id > pv2->queue_id)
    return 1;
  else if (pv1->queue_id < pv2->queue_id)
    return -1;
  else
    return 0;
}

void
vnet_hw_if_update_runtime_data (vnet_main_t *vnm, u32 hw_if_index)
{
  vlib_main_t *vm = vlib_get_main ();
  vnet_interface_main_t *im = &vnm->interface_main;
  vnet_hw_interface_t *hi = vnet_get_hw_interface (vnm, hw_if_index);
  u32 node_index = hi->input_node_index;
  vnet_hw_if_rx_queue_t *rxq;
  vnet_hw_if_rxq_poll_vector_t *pv, **d = 0;
  vlib_node_state_t *per_thread_node_state = 0;
  u32 n_threads = vec_len (vlib_mains);
  int something_changed = 0;
  clib_bitmap_t *pending_int = 0;
  int last_int = -1;

  log_debug ("update node '%U' triggered by interface %v",
	     format_vlib_node_name, vm, node_index, hi->name);

  vec_validate (d, n_threads - 1);
  vec_validate_init_empty (per_thread_node_state, n_threads - 1,
			   VLIB_NODE_STATE_DISABLED);

  /* find out desired node state on each thread */
  pool_foreach (rxq, im->hw_if_rx_queues)
    {
      u32 ti = rxq->thread_index;

      ASSERT (rxq->mode != VNET_HW_IF_RX_MODE_UNKNOWN);
      ASSERT (rxq->mode != VNET_HW_IF_RX_MODE_DEFAULT);

      hi = vnet_get_hw_interface (vnm, rxq->hw_if_index);

      if (hi->input_node_index != node_index)
	continue;

      if (rxq->mode == VNET_HW_IF_RX_MODE_POLLING)
	per_thread_node_state[ti] = VLIB_NODE_STATE_POLLING;

      if (per_thread_node_state[ti] == VLIB_NODE_STATE_POLLING)
	continue;

      if (rxq->mode == VNET_HW_IF_RX_MODE_INTERRUPT ||
	  rxq->mode == VNET_HW_IF_RX_MODE_ADAPTIVE)
	per_thread_node_state[ti] = VLIB_NODE_STATE_INTERRUPT;
    }

  /* construct per-thread polling vectors */
  pool_foreach (rxq, im->hw_if_rx_queues)
    {
      u32 ti = rxq->thread_index;

      hi = vnet_get_hw_interface (vnm, rxq->hw_if_index);

      if (hi->input_node_index != node_index)
	continue;

      if (rxq->mode == VNET_HW_IF_RX_MODE_INTERRUPT ||
	  rxq->mode == VNET_HW_IF_RX_MODE_ADAPTIVE)
	last_int = clib_max (last_int, rxq - im->hw_if_rx_queues);

      if (per_thread_node_state[ti] != VLIB_NODE_STATE_POLLING)
	continue;

      vec_add2_aligned (d[ti], pv, 1, CLIB_CACHE_LINE_BYTES);
      pv->dev_instance = rxq->dev_instance;
      pv->queue_id = rxq->queue_id;
    }

  /* sort poll vectors and compare them with active ones to avoid
   * unnecesary barrier */
  for (int i = 0; i < n_threads; i++)
    {
      vlib_node_state_t old_state;
      vec_sort_with_function (d[i], poll_data_sort);

      old_state = vlib_node_get_state (vlib_mains[i], node_index);
      if (per_thread_node_state[i] != old_state)
	{
	  something_changed = 1;
	  log_debug ("state changed for node %U on thread %u from %s to %s",
		     format_vlib_node_name, vm, node_index, i,
		     node_state_str[old_state],
		     node_state_str[per_thread_node_state[i]]);
	}

      /* check if something changed */
      if (something_changed == 0)
	{
	  vnet_hw_if_rx_node_runtime_t *rt;
	  rt = vlib_node_get_runtime_data (vlib_mains[i], node_index);
	  if (vec_len (rt->rxq_poll_vector) != vec_len (d[i]))
	    something_changed = 1;
	  else if (memcmp (d[i], rt->rxq_poll_vector,
			   vec_len (d[i]) * sizeof (*d)))
	    something_changed = 1;
	  if (clib_interrupt_get_n_int (rt->rxq_interrupts) != last_int + 1)
	    something_changed = 1;
	}
    }

  if (something_changed)
    {
      int with_barrier;

      if (vlib_worker_thread_barrier_held ())
	{
	  with_barrier = 0;
	  log_debug ("%s", "already running under the barrier");
	}
      else
	with_barrier = 1;

      if (with_barrier)
	vlib_worker_thread_barrier_sync (vm);

      for (int i = 0; i < n_threads; i++)
	{
	  vlib_main_t *vm = vlib_mains[i];
	  vnet_hw_if_rx_node_runtime_t *rt;
	  rt = vlib_node_get_runtime_data (vm, node_index);
	  pv = rt->rxq_poll_vector;
	  rt->rxq_poll_vector = d[i];
	  d[i] = pv;

	  if (rt->rxq_interrupts)
	    {
	      void *in = rt->rxq_interrupts;
	      int int_num = -1;
	      while ((int_num = clib_interrupt_get_next (in, int_num)) != -1)
		{
		  clib_interrupt_clear (in, int_num);
		  pending_int = clib_bitmap_set (pending_int, int_num, 1);
		  last_int = clib_max (last_int, int_num);
		}
	    }

	  vlib_node_set_state (vm, node_index, per_thread_node_state[i]);

	  if (last_int >= 0)
	    clib_interrupt_resize (&rt->rxq_interrupts, last_int + 1);
	  else
	    clib_interrupt_free (&rt->rxq_interrupts);
	}

      if (with_barrier)
	vlib_worker_thread_barrier_release (vm);
    }
  else
    log_debug ("skipping update of node '%U', no changes detected",
	       format_vlib_node_name, vm, node_index);

  if (pending_int)
    {
      int i;
      clib_bitmap_foreach (i, pending_int)
	{
	  vnet_hw_if_rx_queue_set_int_pending (vnm, i);
	}
      clib_bitmap_free (pending_int);
    }

  for (int i = 0; i < n_threads; i++)
    vec_free (d[i]);

  vec_free (d);
  vec_free (per_thread_node_state);
}