summaryrefslogtreecommitdiffstats
path: root/src/vnet/devices/virtio/virtio.c
blob: 2648f29af844d06715aed53f90ecc7b0044b2685 (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
/*
 *------------------------------------------------------------------
 * Copyright (c) 2017 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 <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <net/if.h>
#include <linux/if_tun.h>
#include <sys/ioctl.h>
#include <linux/virtio_net.h>
#include <linux/vhost.h>
#include <sys/eventfd.h>

#include <vlib/vlib.h>
#include <vlib/pci/pci.h>
#include <vlib/unix/unix.h>
#include <vnet/ethernet/ethernet.h>
#include <vnet/ip/ip4_packet.h>
#include <vnet/ip/ip6_packet.h>
#include <vnet/devices/virtio/virtio.h>
#include <vnet/devices/virtio/pci.h>

virtio_main_t virtio_main;

#define _IOCTL(fd,a,...) \
  if (ioctl (fd, a, __VA_ARGS__) < 0) \
    { \
      err = clib_error_return_unix (0, "ioctl(" #a ")"); \
      goto error; \
    }

static clib_error_t *
call_read_ready (clib_file_t * uf)
{
  virtio_main_t *nm = &virtio_main;
  vnet_main_t *vnm = vnet_get_main ();
  u16 qid = uf->private_data & 0xFFFF;
  virtio_if_t *vif =
    vec_elt_at_index (nm->interfaces, uf->private_data >> 16);
  u64 b;

  CLIB_UNUSED (ssize_t size) = read (uf->file_descriptor, &b, sizeof (b));
  if ((qid & 1) == 0)
    vnet_device_input_set_interrupt_pending (vnm, vif->hw_if_index, qid);

  return 0;
}


clib_error_t *
virtio_vring_init (vlib_main_t * vm, virtio_if_t * vif, u16 idx, u16 sz)
{
  clib_error_t *err = 0;
  virtio_vring_t *vring;
  struct vhost_vring_state state = { 0 };
  struct vhost_vring_addr addr = { 0 };
  struct vhost_vring_file file = { 0 };
  clib_file_t t = { 0 };
  int i;

  if (!is_pow2 (sz))
    return clib_error_return (0, "ring size must be power of 2");

  if (sz > 32768)
    return clib_error_return (0, "ring size must be 32768 or lower");

  if (sz == 0)
    sz = 256;

  vec_validate_aligned (vif->vrings, idx, CLIB_CACHE_LINE_BYTES);
  vring = vec_elt_at_index (vif->vrings, idx);

  i = sizeof (struct vring_desc) * sz;
  i = round_pow2 (i, CLIB_CACHE_LINE_BYTES);
  vring->desc = clib_mem_alloc_aligned (i, CLIB_CACHE_LINE_BYTES);
  clib_memset (vring->desc, 0, i);

  i = sizeof (struct vring_avail) + sz * sizeof (vring->avail->ring[0]);
  i = round_pow2 (i, CLIB_CACHE_LINE_BYTES);
  vring->avail = clib_mem_alloc_aligned (i, CLIB_CACHE_LINE_BYTES);
  clib_memset (vring->avail, 0, i);
  // tell kernel that we don't need interrupt
  vring->avail->flags = VIRTIO_RING_FLAG_MASK_INT;

  i = sizeof (struct vring_used) + sz * sizeof (struct vring_used_elem);
  i = round_pow2 (i, CLIB_CACHE_LINE_BYTES);
  vring->used = clib_mem_alloc_aligned (i, CLIB_CACHE_LINE_BYTES);
  clib_memset (vring->used, 0, i);

  ASSERT (vring->buffers == 0);
  vec_validate_aligned (vring->buffers, sz, CLIB_CACHE_LINE_BYTES);
  ASSERT (vring->indirect_buffers == 0);
  vec_validate_aligned (vring->indirect_buffers, sz, CLIB_CACHE_LINE_BYTES);
  if (idx % 2)
    {
      u32 n_alloc = 0;
      do
	{
	  if (n_alloc < sz)
	    n_alloc =
	      vlib_buffer_alloc (vm, vring->indirect_buffers + n_alloc,
				 sz - n_alloc);
	}
      while (n_alloc != sz);
    }

  vring->size = sz;
  vring->call_fd = eventfd (0, EFD_NONBLOCK | EFD_CLOEXEC);
  vring->kick_fd = eventfd (0, EFD_CLOEXEC);

  t.read_function = call_read_ready;
  t.file_descriptor = vring->call_fd;
  t.private_data = vif->dev_instance << 16 | idx;
  t.description = format (0, "%U vring %u", format_virtio_device_name,
			  vif->dev_instance, idx);
  vring->call_file_index = clib_file_add (&file_main, &t);

  state.index = idx;
  state.num = sz;
  _IOCTL (vif->fd, VHOST_SET_VRING_NUM, &state);

  addr.index = idx;
  addr.flags = 0;
  addr.desc_user_addr = pointer_to_uword (vring->desc);
  addr.avail_user_addr = pointer_to_uword (vring->avail);
  addr.used_user_addr = pointer_to_uword (vring->used);
  _IOCTL (vif->fd, VHOST_SET_VRING_ADDR, &addr);

  file.index = idx;
  file.fd = vring->kick_fd;
  _IOCTL (vif->fd, VHOST_SET_VRING_KICK, &file);
  file.fd = vring->call_fd;
  _IOCTL (vif->fd, VHOST_SET_VRING_CALL, &file);
  file.fd = vif->tap_fd;
  _IOCTL (vif->fd, VHOST_NET_SET_BACKEND, &file);

error:
  return err;
}

inline void
virtio_free_rx_buffers (vlib_main_t * vm, virtio_vring_t * vring)
{
  u16 used = vring->desc_in_use;
  u16 last = vring->last_used_idx;
  u16 mask = vring->size - 1;

  while (used)
    {
      vlib_buffer_free (vm, &vring->buffers[last & mask], 1);
      last++;
      used--;
    }
}

clib_error_t *
virtio_vring_free (vlib_main_t * vm, virtio_if_t * vif, u32 idx)
{
  virtio_vring_t *vring = vec_elt_at_index (vif->vrings, idx);

  clib_file_del_by_index (&file_main, vring->call_file_index);
  close (vring->kick_fd);
  close (vring->call_fd);
  if (vring->used)
    {
      if ((idx & 1) == 1)
	virtio_free_used_desc (vm, vring);
      else
	virtio_free_rx_buffers (vm, vring);
      clib_mem_free (vring->used);
    }
  if (vring->desc)
    clib_mem_free (vring->desc);
  if (vring->avail)
    clib_mem_free (vring->avail);
  if (vring->queue_id % 2)
    {
      vlib_buffer_free_no_next (vm, vring->indirect_buffers, vring->size);
    }
  vec_free (vring->buffers);
  vec_free (vring->indirect_buffers);
  return 0;
}

void
virtio_vring_set_numa_node (vlib_main_t * vm, virtio_if_t * vif, u32 idx)
{
  vnet_main_t *vnm = vnet_get_main ();
  u32 thread_index;
  virtio_vring_t *vring = vec_elt_at_index (vif->vrings, idx);
  thread_index =
    vnet_get_device_input_thread_index (vnm, vif->hw_if_index,
					vring->queue_id);
  vring->buffer_pool_index =
    vlib_buffer_pool_get_default_for_numa (vm,
					   vlib_mains
					   [thread_index]->numa_node);
}

inline void
virtio_set_net_hdr_size (virtio_if_t * vif)
{
  if (vif->features & VIRTIO_FEATURE (VIRTIO_NET_F_MRG_RXBUF) ||
      vif->features & VIRTIO_FEATURE (VIRTIO_F_VERSION_1))
    vif->virtio_net_hdr_sz = sizeof (struct virtio_net_hdr_v1);
  else
    vif->virtio_net_hdr_sz = sizeof (struct virtio_net_hdr);
}

inline void
virtio_show (vlib_main_t * vm, u32 * hw_if_indices, u8 show_descr, u32 type)
{
  u32 i, j, hw_if_index;
  virtio_if_t *vif;
  vnet_main_t *vnm = &vnet_main;
  virtio_main_t *mm = &virtio_main;
  virtio_vring_t *vring;
  struct feat_struct
  {
    u8 bit;
    char *str;
  };
  struct feat_struct *feat_entry;

  static struct feat_struct feat_array[] = {
#define _(s,b) { .str = #s, .bit = b, },
    foreach_virtio_net_features
#undef _
    {.str = NULL}
  };

  struct feat_struct *flag_entry;
  static struct feat_struct flags_array[] = {
#define _(b,e,s) { .bit = b, .str = s, },
    foreach_virtio_if_flag
#undef _
    {.str = NULL}
  };

  if (!hw_if_indices)
    return;

  for (hw_if_index = 0; hw_if_index < vec_len (hw_if_indices); hw_if_index++)
    {
      vnet_hw_interface_t *hi =
	vnet_get_hw_interface (vnm, hw_if_indices[hw_if_index]);
      vif = pool_elt_at_index (mm->interfaces, hi->dev_instance);
      if (vif->type != type)
	continue;
      vlib_cli_output (vm, "Interface: %U (ifindex %d)",
		       format_vnet_hw_if_index_name, vnm,
		       hw_if_indices[hw_if_index], vif->hw_if_index);
      if (type == VIRTIO_IF_TYPE_PCI)
	{
	  vlib_cli_output (vm, "  PCI Address: %U", format_vlib_pci_addr,
			   &vif->pci_addr);
	}
      if (type == VIRTIO_IF_TYPE_TAP)
	{
	  if (vif->host_if_name)
	    vlib_cli_output (vm, "  name \"%s\"", vif->host_if_name);
	  if (vif->net_ns)
	    vlib_cli_output (vm, "  host-ns \"%s\"", vif->net_ns);
	  vlib_cli_output (vm, "  fd %d", vif->fd);
	  vlib_cli_output (vm, "  tap-fd %d", vif->tap_fd);
	  vlib_cli_output (vm, "  gso-enabled %d", vif->gso_enabled);
	}
      vlib_cli_output (vm, "  Mac Address: %U", format_ethernet_address,
		       vif->mac_addr);
      vlib_cli_output (vm, "  Device instance: %u", vif->dev_instance);
      vlib_cli_output (vm, "  flags 0x%x", vif->flags);
      flag_entry = (struct feat_struct *) &flags_array;
      while (flag_entry->str)
	{
	  if (vif->flags & (1ULL << flag_entry->bit))
	    vlib_cli_output (vm, "    %s (%d)", flag_entry->str,
			     flag_entry->bit);
	  flag_entry++;
	}
      if (type == VIRTIO_IF_TYPE_PCI)
	{
	  device_status (vm, vif);
	}
      vlib_cli_output (vm, "  features 0x%lx", vif->features);
      feat_entry = (struct feat_struct *) &feat_array;
      while (feat_entry->str)
	{
	  if (vif->features & (1ULL << feat_entry->bit))
	    vlib_cli_output (vm, "    %s (%d)", feat_entry->str,
			     feat_entry->bit);
	  feat_entry++;
	}
      vlib_cli_output (vm, "  remote-features 0x%lx", vif->remote_features);
      feat_entry = (struct feat_struct *) &feat_array;
      while (feat_entry->str)
	{
	  if (vif->remote_features & (1ULL << feat_entry->bit))
	    vlib_cli_output (vm, "    %s (%d)", feat_entry->str,
			     feat_entry->bit);
	  feat_entry++;
	}
      vec_foreach_index (i, vif->vrings)
      {
	// RX = 0, TX = 1
	vring = vec_elt_at_index (vif->vrings, i);
	vlib_cli_output (vm, "  Virtqueue (%s)", (i & 1) ? "TX" : "RX");
	vlib_cli_output (vm,
			 "    qsz %d, last_used_idx %d, desc_next %d, desc_in_use %d",
			 vring->size, vring->last_used_idx, vring->desc_next,
			 vring->desc_in_use);
	vlib_cli_output (vm,
			 "    avail.flags 0x%x avail.idx %d used.flags 0x%x used.idx %d",
			 vring->avail->flags, vring->avail->idx,
			 vring->used->flags, vring->used->idx);
	if (type == VIRTIO_IF_TYPE_TAP)
	  {
	    vlib_cli_output (vm, "    kickfd %d, callfd %d", vring->kick_fd,
			     vring->call_fd);
	  }
	if (show_descr)
	  {
	    vlib_cli_output (vm, "\n  descriptor table:\n");
	    vlib_cli_output (vm,
			     "   id          addr         len  flags  next      user_addr\n");
	    vlib_cli_output (vm,
			     "  ===== ================== ===== ====== ===== ==================\n");
	    vring = vif->vrings;
	    for (j = 0; j < vring->size; j++)
	      {
		struct vring_desc *desc = &vring->desc[j];
		vlib_cli_output (vm,
				 "  %-5d 0x%016lx %-5d 0x%04x %-5d 0x%016lx\n",
				 j, desc->addr,
				 desc->len,
				 desc->flags, desc->next, desc->addr);
	      }
	  }
      }
    }

}

/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */