aboutsummaryrefslogtreecommitdiffstats
path: root/lib/librte_table/rte_table_lpm_ipv6.c
blob: a55f808a4b1b09c5ae06aa2fe27a657d7c8f3317 (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
/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright(c) 2010-2014 Intel Corporation
 */

#include <string.h>
#include <stdio.h>

#include <rte_common.h>
#include <rte_mbuf.h>
#include <rte_memory.h>
#include <rte_malloc.h>
#include <rte_byteorder.h>
#include <rte_log.h>
#include <rte_lpm6.h>

#include "rte_table_lpm_ipv6.h"

#define RTE_TABLE_LPM_MAX_NEXT_HOPS                        256

#ifdef RTE_TABLE_STATS_COLLECT

#define RTE_TABLE_LPM_IPV6_STATS_PKTS_IN_ADD(table, val) \
	table->stats.n_pkts_in += val
#define RTE_TABLE_LPM_IPV6_STATS_PKTS_LOOKUP_MISS(table, val) \
	table->stats.n_pkts_lookup_miss += val

#else

#define RTE_TABLE_LPM_IPV6_STATS_PKTS_IN_ADD(table, val)
#define RTE_TABLE_LPM_IPV6_STATS_PKTS_LOOKUP_MISS(table, val)

#endif

struct rte_table_lpm_ipv6 {
	struct rte_table_stats stats;

	/* Input parameters */
	uint32_t entry_size;
	uint32_t entry_unique_size;
	uint32_t n_rules;
	uint32_t offset;

	/* Handle to low-level LPM table */
	struct rte_lpm6 *lpm;

	/* Next Hop Table (NHT) */
	uint32_t nht_users[RTE_TABLE_LPM_MAX_NEXT_HOPS];
	uint8_t nht[0] __rte_cache_aligned;
};

static void *
rte_table_lpm_ipv6_create(void *params, int socket_id, uint32_t entry_size)
{
	struct rte_table_lpm_ipv6_params *p =
		params;
	struct rte_table_lpm_ipv6 *lpm;
	struct rte_lpm6_config lpm6_config;
	uint32_t total_size, nht_size;

	/* Check input parameters */
	if (p == NULL) {
		RTE_LOG(ERR, TABLE, "%s: NULL input parameters\n", __func__);
		return NULL;
	}
	if (p->n_rules == 0) {
		RTE_LOG(ERR, TABLE, "%s: Invalid n_rules\n", __func__);
		return NULL;
	}
	if (p->number_tbl8s == 0) {
		RTE_LOG(ERR, TABLE, "%s: Invalid n_rules\n", __func__);
		return NULL;
	}
	if (p->entry_unique_size == 0) {
		RTE_LOG(ERR, TABLE, "%s: Invalid entry_unique_size\n",
			__func__);
		return NULL;
	}
	if (p->entry_unique_size > entry_size) {
		RTE_LOG(ERR, TABLE, "%s: Invalid entry_unique_size\n",
			__func__);
		return NULL;
	}
	if (p->name == NULL) {
		RTE_LOG(ERR, TABLE, "%s: Table name is NULL\n",
			__func__);
		return NULL;
	}
	entry_size = RTE_ALIGN(entry_size, sizeof(uint64_t));

	/* Memory allocation */
	nht_size = RTE_TABLE_LPM_MAX_NEXT_HOPS * entry_size;
	total_size = sizeof(struct rte_table_lpm_ipv6) + nht_size;
	lpm = rte_zmalloc_socket("TABLE", total_size, RTE_CACHE_LINE_SIZE,
		socket_id);
	if (lpm == NULL) {
		RTE_LOG(ERR, TABLE,
			"%s: Cannot allocate %u bytes for LPM IPv6 table\n",
			__func__, total_size);
		return NULL;
	}

	/* LPM low-level table creation */
	lpm6_config.max_rules = p->n_rules;
	lpm6_config.number_tbl8s = p->number_tbl8s;
	lpm6_config.flags = 0;
	lpm->lpm = rte_lpm6_create(p->name, socket_id, &lpm6_config);
	if (lpm->lpm == NULL) {
		rte_free(lpm);
		RTE_LOG(ERR, TABLE,
			"Unable to create low-level LPM IPv6 table\n");
		return NULL;
	}

	/* Memory initialization */
	lpm->entry_size = entry_size;
	lpm->entry_unique_size = p->entry_unique_size;
	lpm->n_rules = p->n_rules;
	lpm->offset = p->offset;

	return lpm;
}

static int
rte_table_lpm_ipv6_free(void *table)
{
	struct rte_table_lpm_ipv6 *lpm = table;

	/* Check input parameters */
	if (lpm == NULL) {
		RTE_LOG(ERR, TABLE, "%s: table parameter is NULL\n", __func__);
		return -EINVAL;
	}

	/* Free previously allocated resources */
	rte_lpm6_free(lpm->lpm);
	rte_free(lpm);

	return 0;
}

static int
nht_find_free(struct rte_table_lpm_ipv6 *lpm, uint32_t *pos)
{
	uint32_t i;

	for (i = 0; i < RTE_TABLE_LPM_MAX_NEXT_HOPS; i++) {
		if (lpm->nht_users[i] == 0) {
			*pos = i;
			return 1;
		}
	}

	return 0;
}

static int
nht_find_existing(struct rte_table_lpm_ipv6 *lpm, void *entry, uint32_t *pos)
{
	uint32_t i;

	for (i = 0; i < RTE_TABLE_LPM_MAX_NEXT_HOPS; i++) {
		uint8_t *nht_entry = &lpm->nht[i * lpm->entry_size];

		if ((lpm->nht_users[i] > 0) && (memcmp(nht_entry, entry,
			lpm->entry_unique_size) == 0)) {
			*pos = i;
			return 1;
		}
	}

	return 0;
}

static int
rte_table_lpm_ipv6_entry_add(
	void *table,
	void *key,
	void *entry,
	int *key_found,
	void **entry_ptr)
{
	struct rte_table_lpm_ipv6 *lpm = table;
	struct rte_table_lpm_ipv6_key *ip_prefix =
		key;
	uint32_t nht_pos, nht_pos0, nht_pos0_valid;
	int status;

	/* Check input parameters */
	if (lpm == NULL) {
		RTE_LOG(ERR, TABLE, "%s: table parameter is NULL\n", __func__);
		return -EINVAL;
	}
	if (ip_prefix == NULL) {
		RTE_LOG(ERR, TABLE, "%s: ip_prefix parameter is NULL\n",
			__func__);
		return -EINVAL;
	}
	if (entry == NULL) {
		RTE_LOG(ERR, TABLE, "%s: entry parameter is NULL\n", __func__);
		return -EINVAL;
	}

	if ((ip_prefix->depth == 0) || (ip_prefix->depth > 128)) {
		RTE_LOG(ERR, TABLE, "%s: invalid depth (%d)\n", __func__,
			ip_prefix->depth);
		return -EINVAL;
	}

	/* Check if rule is already present in the table */
	status = rte_lpm6_is_rule_present(lpm->lpm, ip_prefix->ip,
		ip_prefix->depth, &nht_pos0);
	nht_pos0_valid = status > 0;

	/* Find existing or free NHT entry */
	if (nht_find_existing(lpm, entry, &nht_pos) == 0) {
		uint8_t *nht_entry;

		if (nht_find_free(lpm, &nht_pos) == 0) {
			RTE_LOG(ERR, TABLE, "%s: NHT full\n", __func__);
			return -1;
		}

		nht_entry = &lpm->nht[nht_pos * lpm->entry_size];
		memcpy(nht_entry, entry, lpm->entry_size);
	}

	/* Add rule to low level LPM table */
	if (rte_lpm6_add(lpm->lpm, ip_prefix->ip, ip_prefix->depth,
		nht_pos) < 0) {
		RTE_LOG(ERR, TABLE, "%s: LPM IPv6 rule add failed\n", __func__);
		return -1;
	}

	/* Commit NHT changes */
	lpm->nht_users[nht_pos]++;
	lpm->nht_users[nht_pos0] -= nht_pos0_valid;

	*key_found = nht_pos0_valid;
	*entry_ptr = (void *) &lpm->nht[nht_pos * lpm->entry_size];
	return 0;
}

static int
rte_table_lpm_ipv6_entry_delete(
	void *table,
	void *key,
	int *key_found,
	void *entry)
{
	struct rte_table_lpm_ipv6 *lpm = table;
	struct rte_table_lpm_ipv6_key *ip_prefix =
		key;
	uint32_t nht_pos;
	int status;

	/* Check input parameters */
	if (lpm == NULL) {
		RTE_LOG(ERR, TABLE, "%s: table parameter is NULL\n", __func__);
		return -EINVAL;
	}
	if (ip_prefix == NULL) {
		RTE_LOG(ERR, TABLE, "%s: ip_prefix parameter is NULL\n",
			__func__);
		return -EINVAL;
	}
	if ((ip_prefix->depth == 0) || (ip_prefix->depth > 128)) {
		RTE_LOG(ERR, TABLE, "%s: invalid depth (%d)\n", __func__,
			ip_prefix->depth);
		return -EINVAL;
	}

	/* Return if rule is not present in the table */
	status = rte_lpm6_is_rule_present(lpm->lpm, ip_prefix->ip,
		ip_prefix->depth, &nht_pos);
	if (status < 0) {
		RTE_LOG(ERR, TABLE, "%s: LPM IPv6 algorithmic error\n",
			__func__);
		return -1;
	}
	if (status == 0) {
		*key_found = 0;
		return 0;
	}

	/* Delete rule from the low-level LPM table */
	status = rte_lpm6_delete(lpm->lpm, ip_prefix->ip, ip_prefix->depth);
	if (status) {
		RTE_LOG(ERR, TABLE, "%s: LPM IPv6 rule delete failed\n",
			__func__);
		return -1;
	}

	/* Commit NHT changes */
	lpm->nht_users[nht_pos]--;

	*key_found = 1;
	if (entry)
		memcpy(entry, &lpm->nht[nht_pos * lpm->entry_size],
			lpm->entry_size);

	return 0;
}

static int
rte_table_lpm_ipv6_lookup(
	void *table,
	struct rte_mbuf **pkts,
	uint64_t pkts_mask,
	uint64_t *lookup_hit_mask,
	void **entries)
{
	struct rte_table_lpm_ipv6 *lpm = (struct rte_table_lpm_ipv6 *) table;
	uint64_t pkts_out_mask = 0;
	uint32_t i;

	__rte_unused uint32_t n_pkts_in = __builtin_popcountll(pkts_mask);
	RTE_TABLE_LPM_IPV6_STATS_PKTS_IN_ADD(lpm, n_pkts_in);

	pkts_out_mask = 0;
	for (i = 0; i < (uint32_t)(RTE_PORT_IN_BURST_SIZE_MAX -
		__builtin_clzll(pkts_mask)); i++) {
		uint64_t pkt_mask = 1LLU << i;

		if (pkt_mask & pkts_mask) {
			struct rte_mbuf *pkt = pkts[i];
			uint8_t *ip = RTE_MBUF_METADATA_UINT8_PTR(pkt,
				lpm->offset);
			int status;
			uint32_t nht_pos;

			status = rte_lpm6_lookup(lpm->lpm, ip, &nht_pos);
			if (status == 0) {
				pkts_out_mask |= pkt_mask;
				entries[i] = (void *) &lpm->nht[nht_pos *
					lpm->entry_size];
			}
		}
	}

	*lookup_hit_mask = pkts_out_mask;
	RTE_TABLE_LPM_IPV6_STATS_PKTS_LOOKUP_MISS(lpm, n_pkts_in - __builtin_popcountll(pkts_out_mask));
	return 0;
}

static int
rte_table_lpm_ipv6_stats_read(void *table, struct rte_table_stats *stats, int clear)
{
	struct rte_table_lpm_ipv6 *t = table;

	if (stats != NULL)
		memcpy(stats, &t->stats, sizeof(t->stats));

	if (clear)
		memset(&t->stats, 0, sizeof(t->stats));

	return 0;
}

struct rte_table_ops rte_table_lpm_ipv6_ops = {
	.f_create = rte_table_lpm_ipv6_create,
	.f_free = rte_table_lpm_ipv6_free,
	.f_add = rte_table_lpm_ipv6_entry_add,
	.f_delete = rte_table_lpm_ipv6_entry_delete,
	.f_add_bulk = NULL,
	.f_delete_bulk = NULL,
	.f_lookup = rte_table_lpm_ipv6_lookup,
	.f_stats = rte_table_lpm_ipv6_stats_read,
};