summaryrefslogtreecommitdiffstats
path: root/src/plugins/dma_intel/main.c
blob: 4e9df04ea9e22dfa1e3eb7bcf3571376f45ac08a (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
/* SPDX-License-Identifier: Apache-2.0
 * Copyright (c) 2022 Cisco Systems, Inc.
 * Copyright (c) 2022 Intel and/or its affiliates.
 */
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <vlib/vlib.h>
#include <vlib/pci/pci.h>
#include <vlib/dma/dma.h>
#include <vnet/plugin/plugin.h>
#include <vpp/app/version.h>
#include <vppinfra/linux/sysfs.h>
#include <dma_intel/dsa_intel.h>

VLIB_REGISTER_LOG_CLASS (intel_dsa_log, static) = {
  .class_name = "intel_dsa",
};

intel_dsa_main_t intel_dsa_main;

void
intel_dsa_assign_channels (vlib_main_t *vm)
{
  intel_dsa_main_t *idm = &intel_dsa_main;
  intel_dsa_channel_t *ch, **chv = 0;
  u16 n_threads;
  int n;

  vec_foreach_index (n, idm->channels)
    vec_append (chv, idm->channels[n]);

  vec_validate (idm->dsa_threads, vlib_get_n_threads () - 1);

  if (vec_len (chv) == 0)
    {
      dsa_log_debug ("No DSA channels found");
      goto done;
    }

  if (vec_len (chv) >= vlib_get_n_threads ())
    n_threads = 1;
  else
    n_threads = vlib_get_n_threads () % vec_len (chv) ?
			vlib_get_n_threads () / vec_len (chv) + 1 :
			vlib_get_n_threads () / vec_len (chv);

  for (int i = 0; i < vlib_get_n_threads (); i++)
    {
      vlib_main_t *tvm = vlib_get_main_by_index (i);
      ch = *vec_elt_at_index (chv, i / n_threads);
      idm->dsa_threads[i].ch = ch;
      ch->n_threads = n_threads;
      dsa_log_debug ("Assigning channel %u/%u to thread %u (numa %u)", ch->did,
		     ch->qid, i, tvm->numa_node);
    }

done:
  /* free */
  vec_free (chv);
}

static clib_error_t *
intel_dsa_map_region (intel_dsa_channel_t *ch)
{
  static clib_error_t *error = NULL;
  /* map one page */
  uword size = 0x1000;
  uword offset = 0;
  char path[256] = { 0 };

  snprintf (path, sizeof (path), "%s/wq%d.%d", DSA_DEV_PATH, ch->did, ch->qid);
  int fd = open (path, O_RDWR);
  if (fd < 0)
    return clib_error_return (0, "failed to open dsa device %s", path);

  ch->portal =
    clib_mem_vm_map_shared (0, size, fd, offset, "%s", (char *) path);
  if (ch->portal == CLIB_MEM_VM_MAP_FAILED)
    {
      error = clib_error_return (0, "mmap portal %s failed", path);
      close (fd);
      return error;
    }

  return NULL;
}

static clib_error_t *
intel_dsa_get_info (intel_dsa_channel_t *ch, clib_error_t **error)
{
  clib_error_t *err;
  u8 *tmpstr;
  u8 *dev_dir_name = 0, *wq_dir_name = 0;

  u8 *f = 0;
  dev_dir_name = format (0, "%s/dsa%d", SYS_DSA_PATH, ch->did);

  vec_reset_length (f);
  f = format (f, "%v/numa_node%c", dev_dir_name, 0);
  err = clib_sysfs_read ((char *) f, "%s", &tmpstr);
  if (err)
    goto error;
  ch->numa = atoi ((char *) tmpstr);

  wq_dir_name = format (0, "%s/%U", SYS_DSA_PATH, format_intel_dsa_addr, ch);

  vec_reset_length (f);
  f = format (f, "%v/max_transfer_size%c", wq_dir_name, 0);
  err = clib_sysfs_read ((char *) f, "%s", &tmpstr);
  if (err)
    goto error;
  ch->max_transfer_size = atoi ((char *) tmpstr);

  vec_reset_length (f);
  f = format (f, "%v/max_batch_size%c", wq_dir_name, 0);
  err = clib_sysfs_read ((char *) f, "%s", &tmpstr);
  if (err)
    goto error;
  ch->max_transfers = atoi ((char *) tmpstr);

  vec_reset_length (f);
  f = format (f, "%v/size%c", wq_dir_name, 0);
  err = clib_sysfs_read ((char *) f, "%s", &tmpstr);
  if (err)
    goto error;
  ch->size = atoi ((char *) tmpstr);

  vec_reset_length (f);
  f = format (f, "%v/type%c", wq_dir_name, 0);
  err = clib_sysfs_read ((char *) f, "%s", &tmpstr);
  if (err)
    goto error;
  if (tmpstr)
    {
      if (!clib_strcmp ((char *) tmpstr, "enabled"))
	ch->type = INTEL_DSA_DEVICE_TYPE_UNKNOWN;
      else if (!clib_strcmp ((char *) tmpstr, "user"))
	ch->type = INTEL_DSA_DEVICE_TYPE_USER;
      else if (!clib_strcmp ((char *) tmpstr, "mdev"))
	ch->type = INTEL_DSA_DEVICE_TYPE_KERNEL;
      else
	ch->type = INTEL_DSA_DEVICE_TYPE_UNKNOWN;
      vec_free (tmpstr);
    }

  vec_reset_length (f);
  f = format (f, "%v/state%c", wq_dir_name, 0);
  err = clib_sysfs_read ((char *) f, "%s", &tmpstr);
  if (err)
    goto error;
  if (tmpstr)
    {
      if (!clib_strcmp ((char *) tmpstr, "enabled"))
	ch->state = 1;
      else
	ch->state = 0;
      vec_free (tmpstr);
    }

  vec_reset_length (f);
  f = format (f, "%v/ats_disable%c", wq_dir_name, 0);
  err = clib_sysfs_read ((char *) f, "%s", &tmpstr);
  if (err)
    goto error;
  ch->ats_disable = atoi ((char *) tmpstr);

  vec_reset_length (f);
  f = format (f, "%v/block_on_fault%c", wq_dir_name, 0);
  err = clib_sysfs_read ((char *) f, "%s", &tmpstr);
  if (err)
    goto error;
  ch->block_on_fault = atoi ((char *) tmpstr);

  vec_reset_length (f);
  f = format (f, "%v/mode%c", wq_dir_name, 0);
  err = clib_sysfs_read ((char *) f, "%s", &tmpstr);
  if (err)
    goto error;
  if (tmpstr)
    {
      if (!clib_strcmp ((char *) tmpstr, "dedicated"))
	ch->mode = 1;
      else
	ch->mode = 0;
      vec_free (tmpstr);
    }

  vec_free (f);
  vec_free (dev_dir_name);
  vec_free (wq_dir_name);
  return NULL;

error:
  vec_free (f);
  vec_free (dev_dir_name);
  vec_free (wq_dir_name);

  return err;
}

clib_error_t *
intel_dsa_add_channel (vlib_main_t *vm, intel_dsa_channel_t *ch)
{
  intel_dsa_main_t *dm = &intel_dsa_main;
  clib_error_t *err = 0;

  if (intel_dsa_map_region (ch))
    return clib_error_return (0, "dsa open device failed");

  if (intel_dsa_get_info (ch, &err))
    return clib_error_return (err, "dsa info not scanned");

  vec_validate (dm->channels, ch->numa);
  vec_add1 (dm->channels[ch->numa], ch);

  return err;
}

static clib_error_t *
dsa_config (vlib_main_t *vm, unformat_input_t *input)
{
  clib_error_t *error = 0;
  intel_dsa_channel_t *ch;
  u8 did, qid;

  if (intel_dsa_main.lock == 0)
    clib_spinlock_init (&(intel_dsa_main.lock));

  if ((error = vlib_dma_register_backend (vm, &intel_dsa_backend)))
    goto done;

  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
    {
      if (unformat (input, "dev wq%d.%d", &did, &qid))
	{
	  ch = clib_mem_alloc_aligned (sizeof (*ch), CLIB_CACHE_LINE_BYTES);
	  clib_memset (ch, 0, sizeof (*ch));
	  ch->did = did;
	  ch->qid = qid;
	  if (intel_dsa_add_channel (vm, ch))
	    clib_mem_free (ch);
	}
      else if (unformat_skip_white_space (input))
	;
      else
	{
	  error = clib_error_return (0, "unknown input `%U'",
				     format_unformat_error, input);
	  goto done;
	}
    }

done:
  return error;
}

VLIB_CONFIG_FUNCTION (dsa_config, "dsa");

clib_error_t *
intel_dsa_num_workers_change (vlib_main_t *vm)
{
  intel_dsa_assign_channels (vm);
  return 0;
}

VLIB_NUM_WORKERS_CHANGE_FN (intel_dsa_num_workers_change);

VLIB_PLUGIN_REGISTER () = {
  .version = VPP_BUILD_VER,
  .description = "Intel DSA Backend",
};