summaryrefslogtreecommitdiff
path: root/drivers/net/ethernet/netronome/nfp/flower/metadata.c
blob: 93fb809f50d1a7b0b6577c6a76ac0610e6797735 (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
/*
 * Copyright (C) 2017 Netronome Systems, Inc.
 *
 * This software is dual licensed under the GNU General License Version 2,
 * June 1991 as shown in the file COPYING in the top-level directory of this
 * source tree or the BSD 2-Clause License provided below.  You have the
 * option to license this software under the complete terms of either license.
 *
 * The BSD 2-Clause License:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      1. Redistributions of source code must retain the above
 *         copyright notice, this list of conditions and the following
 *         disclaimer.
 *
 *      2. Redistributions in binary form must reproduce the above
 *         copyright notice, this list of conditions and the following
 *         disclaimer in the documentation and/or other materials
 *         provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <linux/hash.h>
#include <linux/hashtable.h>
#include <linux/jhash.h>
#include <linux/vmalloc.h>
#include <net/pkt_cls.h>

#include "cmsg.h"
#include "main.h"
#include "../nfp_app.h"

struct nfp_mask_id_table {
	struct hlist_node link;
	u32 hash_key;
	u32 ref_cnt;
	u8 mask_id;
};

static int nfp_release_stats_entry(struct nfp_app *app, u32 stats_context_id)
{
	struct nfp_flower_priv *priv = app->priv;
	struct circ_buf *ring;

	ring = &priv->stats_ids.free_list;
	/* Check if buffer is full. */
	if (!CIRC_SPACE(ring->head, ring->tail, NFP_FL_STATS_ENTRY_RS *
			NFP_FL_STATS_ELEM_RS -
			NFP_FL_STATS_ELEM_RS + 1))
		return -ENOBUFS;

	memcpy(&ring->buf[ring->head], &stats_context_id, NFP_FL_STATS_ELEM_RS);
	ring->head = (ring->head + NFP_FL_STATS_ELEM_RS) %
		     (NFP_FL_STATS_ENTRY_RS * NFP_FL_STATS_ELEM_RS);

	return 0;
}

static int nfp_get_stats_entry(struct nfp_app *app, u32 *stats_context_id)
{
	struct nfp_flower_priv *priv = app->priv;
	u32 freed_stats_id, temp_stats_id;
	struct circ_buf *ring;

	ring = &priv->stats_ids.free_list;
	freed_stats_id = NFP_FL_STATS_ENTRY_RS;
	/* Check for unallocated entries first. */
	if (priv->stats_ids.init_unalloc > 0) {
		*stats_context_id = priv->stats_ids.init_unalloc - 1;
		priv->stats_ids.init_unalloc--;
		return 0;
	}

	/* Check if buffer is empty. */
	if (ring->head == ring->tail) {
		*stats_context_id = freed_stats_id;
		return -ENOENT;
	}

	memcpy(&temp_stats_id, &ring->buf[ring->tail], NFP_FL_STATS_ELEM_RS);
	*stats_context_id = temp_stats_id;
	memcpy(&ring->buf[ring->tail], &freed_stats_id, NFP_FL_STATS_ELEM_RS);
	ring->tail = (ring->tail + NFP_FL_STATS_ELEM_RS) %
		     (NFP_FL_STATS_ENTRY_RS * NFP_FL_STATS_ELEM_RS);

	return 0;
}

/* Must be called with either RTNL or rcu_read_lock */
struct nfp_fl_payload *
nfp_flower_search_fl_table(struct nfp_app *app, unsigned long tc_flower_cookie,
			   struct net_device *netdev, __be32 host_ctx)
{
	struct nfp_flower_priv *priv = app->priv;
	struct nfp_fl_payload *flower_entry;

	hash_for_each_possible_rcu(priv->flow_table, flower_entry, link,
				   tc_flower_cookie)
		if (flower_entry->tc_flower_cookie == tc_flower_cookie &&
		    (!netdev || flower_entry->ingress_dev == netdev) &&
		    (host_ctx == NFP_FL_STATS_CTX_DONT_CARE ||
		     flower_entry->meta.host_ctx_id == host_ctx))
			return flower_entry;

	return NULL;
}

static void
nfp_flower_update_stats(struct nfp_app *app, struct nfp_fl_stats_frame *stats)
{
	struct nfp_fl_payload *nfp_flow;
	unsigned long flower_cookie;

	flower_cookie = be64_to_cpu(stats->stats_cookie);

	rcu_read_lock();
	nfp_flow = nfp_flower_search_fl_table(app, flower_cookie, NULL,
					      stats->stats_con_id);
	if (!nfp_flow)
		goto exit_rcu_unlock;

	spin_lock(&nfp_flow->lock);
	nfp_flow->stats.pkts += be32_to_cpu(stats->pkt_count);
	nfp_flow->stats.bytes += be64_to_cpu(stats->byte_count);
	nfp_flow->stats.used = jiffies;
	spin_unlock(&nfp_flow->lock);

exit_rcu_unlock:
	rcu_read_unlock();
}

void nfp_flower_rx_flow_stats(struct nfp_app *app, struct sk_buff *skb)
{
	unsigned int msg_len = nfp_flower_cmsg_get_data_len(skb);
	struct nfp_fl_stats_frame *stats_frame;
	unsigned char *msg;
	int i;

	msg = nfp_flower_cmsg_get_data(skb);

	stats_frame = (struct nfp_fl_stats_frame *)msg;
	for (i = 0; i < msg_len / sizeof(*stats_frame); i++)
		nfp_flower_update_stats(app, stats_frame + i);
}

static int nfp_release_mask_id(struct nfp_app *app, u8 mask_id)
{
	struct nfp_flower_priv *priv = app->priv;
	struct circ_buf *ring;
	struct timespec64 now;

	ring = &priv->mask_ids.mask_id_free_list;
	/* Checking if buffer is full. */
	if (CIRC_SPACE(ring->head, ring->tail, NFP_FLOWER_MASK_ENTRY_RS) == 0)
		return -ENOBUFS;

	memcpy(&ring->buf[ring->head], &mask_id, NFP_FLOWER_MASK_ELEMENT_RS);
	ring->head = (ring->head + NFP_FLOWER_MASK_ELEMENT_RS) %
		     (NFP_FLOWER_MASK_ENTRY_RS * NFP_FLOWER_MASK_ELEMENT_RS);

	getnstimeofday64(&now);
	priv->mask_ids.last_used[mask_id] = now;

	return 0;
}

static int nfp_mask_alloc(struct nfp_app *app, u8 *mask_id)
{
	struct nfp_flower_priv *priv = app->priv;
	struct timespec64 delta, now;
	struct circ_buf *ring;
	u8 temp_id, freed_id;

	ring = &priv->mask_ids.mask_id_free_list;
	freed_id = NFP_FLOWER_MASK_ENTRY_RS - 1;
	/* Checking for unallocated entries first. */
	if (priv->mask_ids.init_unallocated > 0) {
		*mask_id = priv->mask_ids.init_unallocated;
		priv->mask_ids.init_unallocated--;
		return 0;
	}

	/* Checking if buffer is empty. */
	if (ring->head == ring->tail)
		goto err_not_found;

	memcpy(&temp_id, &ring->buf[ring->tail], NFP_FLOWER_MASK_ELEMENT_RS);
	*mask_id = temp_id;

	getnstimeofday64(&now);
	delta = timespec64_sub(now, priv->mask_ids.last_used[*mask_id]);

	if (timespec64_to_ns(&delta) < NFP_FL_MASK_REUSE_TIME_NS)
		goto err_not_found;

	memcpy(&ring->buf[ring->tail], &freed_id, NFP_FLOWER_MASK_ELEMENT_RS);
	ring->tail = (ring->tail + NFP_FLOWER_MASK_ELEMENT_RS) %
		     (NFP_FLOWER_MASK_ENTRY_RS * NFP_FLOWER_MASK_ELEMENT_RS);

	return 0;

err_not_found:
	*mask_id = freed_id;
	return -ENOENT;
}

static int
nfp_add_mask_table(struct nfp_app *app, char *mask_data, u32 mask_len)
{
	struct nfp_flower_priv *priv = app->priv;
	struct nfp_mask_id_table *mask_entry;
	unsigned long hash_key;
	u8 mask_id;

	if (nfp_mask_alloc(app, &mask_id))
		return -ENOENT;

	mask_entry = kmalloc(sizeof(*mask_entry), GFP_KERNEL);
	if (!mask_entry) {
		nfp_release_mask_id(app, mask_id);
		return -ENOMEM;
	}

	INIT_HLIST_NODE(&mask_entry->link);
	mask_entry->mask_id = mask_id;
	hash_key = jhash(mask_data, mask_len, priv->mask_id_seed);
	mask_entry->hash_key = hash_key;
	mask_entry->ref_cnt = 1;
	hash_add(priv->mask_table, &mask_entry->link, hash_key);

	return mask_id;
}

static struct nfp_mask_id_table *
nfp_search_mask_table(struct nfp_app *app, char *mask_data, u32 mask_len)
{
	struct nfp_flower_priv *priv = app->priv;
	struct nfp_mask_id_table *mask_entry;
	unsigned long hash_key;

	hash_key = jhash(mask_data, mask_len, priv->mask_id_seed);

	hash_for_each_possible(priv->mask_table, mask_entry, link, hash_key)
		if (mask_entry->hash_key == hash_key)
			return mask_entry;

	return NULL;
}

static int
nfp_find_in_mask_table(struct nfp_app *app, char *mask_data, u32 mask_len)
{
	struct nfp_mask_id_table *mask_entry;

	mask_entry = nfp_search_mask_table(app, mask_data, mask_len);
	if (!mask_entry)
		return -ENOENT;

	mask_entry->ref_cnt++;

	/* Casting u8 to int for later use. */
	return mask_entry->mask_id;
}

static bool
nfp_check_mask_add(struct nfp_app *app, char *mask_data, u32 mask_len,
		   u8 *meta_flags, u8 *mask_id)
{
	int id;

	id = nfp_find_in_mask_table(app, mask_data, mask_len);
	if (id < 0) {
		id = nfp_add_mask_table(app, mask_data, mask_len);
		if (id < 0)
			return false;
		*meta_flags |= NFP_FL_META_FLAG_MANAGE_MASK;
	}
	*mask_id = id;

	return true;
}

static bool
nfp_check_mask_remove(struct nfp_app *app, char *mask_data, u32 mask_len,
		      u8 *meta_flags, u8 *mask_id)
{
	struct nfp_mask_id_table *mask_entry;

	mask_entry = nfp_search_mask_table(app, mask_data, mask_len);
	if (!mask_entry)
		return false;

	if (meta_flags)
		*meta_flags &= ~NFP_FL_META_FLAG_MANAGE_MASK;

	*mask_id = mask_entry->mask_id;
	mask_entry->ref_cnt--;
	if (!mask_entry->ref_cnt) {
		hash_del(&mask_entry->link);
		nfp_release_mask_id(app, *mask_id);
		kfree(mask_entry);
		if (meta_flags)
			*meta_flags |= NFP_FL_META_FLAG_MANAGE_MASK;
	}

	return true;
}

int nfp_compile_flow_metadata(struct nfp_app *app,
			      struct tc_cls_flower_offload *flow,
			      struct nfp_fl_payload *nfp_flow,
			      struct net_device *netdev)
{
	struct nfp_flower_priv *priv = app->priv;
	struct nfp_fl_payload *check_entry;
	u8 new_mask_id;
	u32 stats_cxt;

	if (nfp_get_stats_entry(app, &stats_cxt))
		return -ENOENT;

	nfp_flow->meta.host_ctx_id = cpu_to_be32(stats_cxt);
	nfp_flow->meta.host_cookie = cpu_to_be64(flow->cookie);

	new_mask_id = 0;
	if (!nfp_check_mask_add(app, nfp_flow->mask_data,
				nfp_flow->meta.mask_len,
				&nfp_flow->meta.flags, &new_mask_id)) {
		if (nfp_release_stats_entry(app, stats_cxt))
			return -EINVAL;
		return -ENOENT;
	}

	nfp_flow->meta.flow_version = cpu_to_be64(priv->flower_version);
	priv->flower_version++;

	/* Update flow payload with mask ids. */
	nfp_flow->unmasked_data[NFP_FL_MASK_ID_LOCATION] = new_mask_id;
	nfp_flow->stats.pkts = 0;
	nfp_flow->stats.bytes = 0;
	nfp_flow->stats.used = jiffies;

	check_entry = nfp_flower_search_fl_table(app, flow->cookie, netdev,
						 NFP_FL_STATS_CTX_DONT_CARE);
	if (check_entry) {
		if (nfp_release_stats_entry(app, stats_cxt))
			return -EINVAL;

		if (!nfp_check_mask_remove(app, nfp_flow->mask_data,
					   nfp_flow->meta.mask_len,
					   NULL, &new_mask_id))
			return -EINVAL;

		return -EEXIST;
	}

	return 0;
}

int nfp_modify_flow_metadata(struct nfp_app *app,
			     struct nfp_fl_payload *nfp_flow)
{
	struct nfp_flower_priv *priv = app->priv;
	u8 new_mask_id = 0;
	u32 temp_ctx_id;

	nfp_check_mask_remove(app, nfp_flow->mask_data,
			      nfp_flow->meta.mask_len, &nfp_flow->meta.flags,
			      &new_mask_id);

	nfp_flow->meta.flow_version = cpu_to_be64(priv->flower_version);
	priv->flower_version++;

	/* Update flow payload with mask ids. */
	nfp_flow->unmasked_data[NFP_FL_MASK_ID_LOCATION] = new_mask_id;

	/* Release the stats ctx id. */
	temp_ctx_id = be32_to_cpu(nfp_flow->meta.host_ctx_id);

	return nfp_release_stats_entry(app, temp_ctx_id);
}

int nfp_flower_metadata_init(struct nfp_app *app)
{
	struct nfp_flower_priv *priv = app->priv;

	hash_init(priv->mask_table);
	hash_init(priv->flow_table);
	get_random_bytes(&priv->mask_id_seed, sizeof(priv->mask_id_seed));

	/* Init ring buffer and unallocated mask_ids. */
	priv->mask_ids.mask_id_free_list.buf =
		kmalloc_array(NFP_FLOWER_MASK_ENTRY_RS,
			      NFP_FLOWER_MASK_ELEMENT_RS, GFP_KERNEL);
	if (!priv->mask_ids.mask_id_free_list.buf)
		return -ENOMEM;

	priv->mask_ids.init_unallocated = NFP_FLOWER_MASK_ENTRY_RS - 1;

	/* Init timestamps for mask id*/
	priv->mask_ids.last_used =
		kmalloc_array(NFP_FLOWER_MASK_ENTRY_RS,
			      sizeof(*priv->mask_ids.last_used), GFP_KERNEL);
	if (!priv->mask_ids.last_used)
		goto err_free_mask_id;

	/* Init ring buffer and unallocated stats_ids. */
	priv->stats_ids.free_list.buf =
		vmalloc(array_size(NFP_FL_STATS_ELEM_RS,
				   NFP_FL_STATS_ENTRY_RS));
	if (!priv->stats_ids.free_list.buf)
		goto err_free_last_used;

	priv->stats_ids.init_unalloc = NFP_FL_REPEATED_HASH_MAX;

	return 0;

err_free_last_used:
	kfree(priv->mask_ids.last_used);
err_free_mask_id:
	kfree(priv->mask_ids.mask_id_free_list.buf);
	return -ENOMEM;
}

void nfp_flower_metadata_cleanup(struct nfp_app *app)
{
	struct nfp_flower_priv *priv = app->priv;

	if (!priv)
		return;

	kfree(priv->mask_ids.mask_id_free_list.buf);
	kfree(priv->mask_ids.last_used);
	vfree(priv->stats_ids.free_list.buf);
}