summaryrefslogtreecommitdiffstats
path: root/src/vlib/linux/vmbus.c
blob: b0663819a45d279efa99c0667526d9d1ecc065bd (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
/*
 * Copyright (c) 2018, Microsoft Corporation.
 * 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.
 */
/*
 * vmbus.c: Linux user space VMBus bus management.
 */

#include <vppinfra/linux/sysfs.h>

#include <vlib/vlib.h>
#include <vlib/vmbus/vmbus.h>
#include <vlib/unix/unix.h>

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <dirent.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <linux/ethtool.h>
#include <linux/sockios.h>

static const char sysfs_vmbus_dev_path[] = "/sys/bus/vmbus/devices";
static const char sysfs_vmbus_drv_path[] = "/sys/bus/vmbus/drivers";
static const char sysfs_class_net_path[] = "/sys/class/net";
static const char uio_drv_name[] = "uio_hv_generic";
static const char netvsc_uuid[] = "f8615163-df3e-46c5-913f-f2d2f965ed0e";

typedef struct
{
  int fd;
  void *addr;
  size_t size;
} linux_vmbus_region_t;

typedef struct
{
  int fd;
  u32 clib_file_index;
} linux_vmbus_irq_t;

typedef struct
{
  vlib_vmbus_dev_handle_t handle;
  vlib_vmbus_addr_t addr;

  /* Device File descriptor */
  int fd;

  /* Minor device for uio device. */
  u32 uio_minor;

  /* private data */
  uword private_data;

} linux_vmbus_device_t;

/* Pool of VMBUS devices. */
typedef struct
{
  vlib_main_t *vlib_main;
  linux_vmbus_device_t *linux_vmbus_devices;

} linux_vmbus_main_t;

linux_vmbus_main_t linux_vmbus_main;

static linux_vmbus_device_t *
linux_vmbus_get_device (vlib_vmbus_dev_handle_t h)
{
  linux_vmbus_main_t *lpm = &linux_vmbus_main;
  return pool_elt_at_index (lpm->linux_vmbus_devices, h);
}

uword
vlib_vmbus_get_private_data (vlib_vmbus_dev_handle_t h)
{
  linux_vmbus_device_t *d = linux_vmbus_get_device (h);
  return d->private_data;
}

void
vlib_vmbus_set_private_data (vlib_vmbus_dev_handle_t h, uword private_data)
{
  linux_vmbus_device_t *d = linux_vmbus_get_device (h);
  d->private_data = private_data;
}

vlib_vmbus_addr_t *
vlib_vmbus_get_addr (vlib_vmbus_dev_handle_t h)
{
  linux_vmbus_device_t *d = linux_vmbus_get_device (h);
  return &d->addr;
}

/* Call to allocate/initialize the vmbus subsystem.
   This is not an init function so that users can explicitly enable
   vmbus only when it's needed. */
clib_error_t *vmbus_bus_init (vlib_main_t * vm);

linux_vmbus_main_t linux_vmbus_main;

/*
 * Take VMBus address represented in standard form like:
 * "f2c086b2-ff2e-11e8-88de-7bad0a57de05" and convert
 * it to u8[16]
 */
uword
unformat_vlib_vmbus_addr (unformat_input_t *input, va_list *args)
{
  vlib_vmbus_addr_t *addr = va_arg (*args, vlib_vmbus_addr_t *);
  uword ret = 0;
  u8 *s = 0;

  if (!unformat (input, "%U", unformat_token, "a-zA-Z0-9-", &s))
    return 0;

  if (vec_len (s) != 36)
    goto fail;

  if (s[8] != '-' || s[13] != '-' || s[18] != '-' || s[23] != '-')
    goto fail;

  clib_memmove (s + 8, s + 9, 4);
  clib_memmove (s + 12, s + 14, 4);
  clib_memmove (s + 16, s + 19, 4);
  clib_memmove (s + 20, s + 24, 12);

  for (int i = 0; i < 32; i++)
    if (s[i] >= '0' && s[i] <= '9')
      s[i] -= '0';
    else if (s[i] >= 'A' && s[i] <= 'F')
      s[i] -= 'A' - 10;
    else if (s[i] >= 'a' && s[i] <= 'f')
      s[i] -= 'a' - 10;
    else
      goto fail;

  for (int i = 0; i < 16; i++)
    addr->guid[i] = s[2 * i] * 16 + s[2 * i + 1];

  ret = 1;

fail:
  vec_free (s);
  return ret;
}

/* Convert bus address to standard UUID string */
u8 *
format_vlib_vmbus_addr (u8 *s, va_list *va)
{
  vlib_vmbus_addr_t *addr = va_arg (*va, vlib_vmbus_addr_t *);
  u8 *bytes = addr->guid;

  for (int i = 0; i < 4; i++)
    s = format (s, "%02X", bytes++[0]);
  vec_add1 (s, '-');
  for (int i = 0; i < 2; i++)
    s = format (s, "%02X", bytes++[0]);
  vec_add1 (s, '-');
  for (int i = 0; i < 2; i++)
    s = format (s, "%02X", bytes++[0]);
  vec_add1 (s, '-');
  for (int i = 0; i < 2; i++)
    s = format (s, "%02X", bytes++[0]);
  vec_add1 (s, '-');
  for (int i = 0; i < 6; i++)
    s = format (s, "%02X", bytes++[0]);

  return s;
}

/* workaround for mlx bug, bring lower device up before unbind */
static clib_error_t *
vlib_vmbus_raise_lower (int fd, const char *upper_name)
{
  clib_error_t *error = 0;
  struct dirent *e;
  struct ifreq ifr;
  u8 *dev_net_dir;
  DIR *dir;

  clib_memset (&ifr, 0, sizeof (ifr));

  dev_net_dir = format (0, "%s/%s%c", sysfs_class_net_path, upper_name, 0);

  dir = opendir ((char *) dev_net_dir);

  if (!dir)
    {
      error = clib_error_return (0, "VMBUS failed to open %s", dev_net_dir);
      goto done;
    }

  while ((e = readdir (dir)))
    {
      /* look for lower_enXXXX */
      if (strncmp (e->d_name, "lower_", 6))
	continue;

      strncpy (ifr.ifr_name, e->d_name + 6, IFNAMSIZ - 1);
      break;
    }
  closedir (dir);

  if (!e)
    goto done;			/* no lower device */

  if (ioctl (fd, SIOCGIFFLAGS, &ifr) < 0)
    error = clib_error_return_unix (0, "ioctl fetch intf %s flags",
				    ifr.ifr_name);
  else if (!(ifr.ifr_flags & IFF_UP))
    {
      ifr.ifr_flags |= IFF_UP;

      if (ioctl (fd, SIOCSIFFLAGS, &ifr) < 0)
	error = clib_error_return_unix (0, "ioctl set intf %s flags",
					ifr.ifr_name);
    }
done:
  vec_free (dev_net_dir);
  return error;
}

static int
directory_exists (char *path)
{
  struct stat s = { 0 };
  if (stat (path, &s) == -1)
    return 0;

  return S_ISDIR (s.st_mode);
}

clib_error_t *
vlib_vmbus_bind_to_uio (vlib_vmbus_addr_t * addr)
{
  clib_error_t *error = 0;
  u8 *dev_dir_name;
  char *ifname = 0;
  static int uio_new_id_needed = 1;
  struct dirent *e;
  struct ifreq ifr;
  u8 *s = 0, *driver_name;
  DIR *dir;
  int fd;

  dev_dir_name = format (0, "%s/%U", sysfs_vmbus_dev_path,
			 format_vlib_vmbus_addr, addr);

  driver_name = clib_file_get_resolved_basename ("%v/driver", dev_dir_name);

  /* skip if not using the Linux kernel netvsc driver */
  if (!driver_name || strcmp ("hv_netvsc", (char *) driver_name) != 0)
    goto done;

  /* if uio_hv_generic is not loaded, then can't use native DPDK driver. */
  if (!directory_exists ("/sys/module/uio_hv_generic"))
    goto done;

  s = format (s, "%v/net%c", dev_dir_name, 0);
  dir = opendir ((char *) s);
  vec_reset_length (s);

  if (!dir)
    return clib_error_return (0, "VMBUS failed to open %s", s);

  while ((e = readdir (dir)))
    {
      if (e->d_name[0] == '.')	/* skip . and .. */
	continue;

      ifname = strdup (e->d_name);
      break;
    }
  closedir (dir);

  if (!ifname)
    {
      error = clib_error_return (0,
				 "VMBUS device %U eth not found",
				 format_vlib_vmbus_addr, addr);
      goto done;
    }


  clib_memset (&ifr, 0, sizeof (ifr));
  strncpy (ifr.ifr_name, ifname, IFNAMSIZ - 1);

  /* read up/down flags */
  fd = socket (PF_INET, SOCK_DGRAM, 0);
  if (fd < 0)
    {
      error = clib_error_return_unix (0, "socket");
      goto done;
    }

  if (ioctl (fd, SIOCGIFFLAGS, &ifr) < 0)
    {
      error = clib_error_return_unix (0, "ioctl fetch intf %s flags",
				      ifr.ifr_name);
      close (fd);
      goto done;
    }

  if (ifr.ifr_flags & IFF_UP)
    {
      error = clib_error_return (
	0, "Skipping VMBUS device %U as host interface %s is up",
	format_vlib_vmbus_addr, addr, ifname);
      close (fd);
      goto done;
    }

  /* tell uio_hv_generic about netvsc device type */
  if (uio_new_id_needed)
    {
      vec_reset_length (s);
      s = format (s, "%s/%s/new_id%c", sysfs_vmbus_drv_path, uio_drv_name, 0);
      error = clib_sysfs_write ((char *) s, "%s", netvsc_uuid);
      /* If device already exists, we can bind/unbind/override driver */
      if (error)
	{
	  if (error->code == EEXIST)
	    {
	      clib_error_free (error);
	    }
	  else
	    {
	      close (fd);
	      goto done;
	    }
	}

      uio_new_id_needed = 0;
    }

  error = vlib_vmbus_raise_lower (fd, ifname);
  close (fd);

  if (error)
    goto done;

  /* prefer the simplier driver_override model */
  vec_reset_length (s);
  s = format (s, "%/driver_override%c", dev_dir_name, 0);
  if (access ((char *) s, F_OK) == 0)
    {
      clib_sysfs_write ((char *) s, "%s", uio_drv_name);
    }
  else
    {
      vec_reset_length (s);

      s = format (s, "%v/driver/unbind%c", dev_dir_name, 0);
      error =
	clib_sysfs_write ((char *) s, "%U", format_vlib_vmbus_addr, addr);

      if (error)
	goto done;

      vec_reset_length (s);

      s = format (s, "%s/%s/bind%c", sysfs_vmbus_drv_path, uio_drv_name, 0);
      error =
	clib_sysfs_write ((char *) s, "%U", format_vlib_vmbus_addr, addr);
    }
  vec_reset_length (s);

done:
  free (ifname);
  vec_free (s);
  vec_free (dev_dir_name);
  vec_free (driver_name);
  return error;
}

static clib_error_t *
scan_vmbus_addr (void *arg, u8 * dev_dir_name, u8 * ignored)
{
  vlib_vmbus_addr_t addr, **addrv = arg;
  unformat_input_t input;
  clib_error_t *err = 0;

  unformat_init_string (&input, (char *) dev_dir_name,
			vec_len (dev_dir_name));

  if (!unformat (&input, "/sys/bus/vmbus/devices/%U",
		 unformat_vlib_vmbus_addr, &addr))
    err = clib_error_return (0, "unformat error `%v`", dev_dir_name);

  unformat_free (&input);

  if (err)
    return err;

  vec_add1 (*addrv, addr);
  return 0;
}

static int
vmbus_addr_cmp (void *v1, void *v2)
{
  vlib_vmbus_addr_t *a1 = v1;
  vlib_vmbus_addr_t *a2 = v2;

  for (int i = 0; i < ARRAY_LEN (a1->guid); i++)
    if (a1->guid[i] > a2->guid[i])
      return 1;
    else if (a1->guid[i] < a2->guid[i])
      return -1;

  return 0;
}

vlib_vmbus_addr_t *
vlib_vmbus_get_all_dev_addrs ()
{
  vlib_vmbus_addr_t *addrs = 0;
  clib_error_t *err;

  err =
    foreach_directory_file ((char *) sysfs_vmbus_dev_path, scan_vmbus_addr,
			    &addrs, /* scan_dirs */ 0);
  if (err)
    {
      vec_free (addrs);
      return 0;
    }

  vec_sort_with_function (addrs, vmbus_addr_cmp);

  return addrs;
}

clib_error_t *
linux_vmbus_init (vlib_main_t * vm)
{
  linux_vmbus_main_t *pm = &linux_vmbus_main;

  pm->vlib_main = vm;

  return 0;
}

/* *INDENT-OFF* */
VLIB_INIT_FUNCTION (linux_vmbus_init) =
{
  .runs_before = VLIB_INITS("unix_input_init"),
};
/* *INDENT-ON* */

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