aboutsummaryrefslogtreecommitdiffstats
path: root/src/vnet/l2/l2_fib.h
blob: e571a210975b33591a4a24cefbead0b1e53adc98 (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
/*
 * l2_fib.h : layer 2 forwarding table (aka mac table)
 *
 * Copyright (c) 2013 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.
 */

#ifndef included_l2fib_h
#define included_l2fib_h

#include <vlib/vlib.h>
#include <vppinfra/bihash_8_8.h>

/*
 * The size of the hash table
 */
#define L2FIB_NUM_BUCKETS (64 * 1024)
#define L2FIB_MEMORY_SIZE (256<<20)

/*
 * The L2fib key is the mac address and bridge domain ID
 */
typedef struct
{
  union
  {
    struct
    {
      u16 bd_index;
      u8 mac[6];
    } fields;
    struct
    {
      u32 w0;
      u32 w1;
    } words;
    u64 raw;
  };
} l2fib_entry_key_t;

STATIC_ASSERT_SIZEOF (l2fib_entry_key_t, 8);


typedef struct
{
  union
  {
    struct
    {
      u8 swif;
      u8 bd;
    };
    u16 as_u16;
  };
} l2fib_seq_num_t;

/*
 * The l2fib entry results
 */
typedef struct
{
  union
  {
    struct
    {
      u32 sw_if_index;		/* output sw_if_index (L3 interface if bvi==1) */

      u8 static_mac:1;		/* static mac, no dataplane learning */
      u8 bvi:1;			/* mac is for a bridged virtual interface */
      u8 filter:1;		/* drop packets to/from this mac */
      u8 unused1:5;
      u8 timestamp;		/* timestamp for aging */
      l2fib_seq_num_t sn;	/* bd/int seq num */
    } fields;
    u64 raw;
  };
} l2fib_entry_result_t;

STATIC_ASSERT_SIZEOF (l2fib_entry_result_t, 8);

/**
 * Compute the hash for the given key and return
 * the corresponding bucket index
 */
always_inline u32
l2fib_compute_hash_bucket (l2fib_entry_key_t * key)
{
  u32 result;
  u32 temp_a;
  u32 temp_b;

  result = 0xa5a5a5a5;		/* some seed */
  temp_a = key->words.w0;
  temp_b = key->words.w1;
  hash_mix32 (temp_a, temp_b, result);

  return result % L2FIB_NUM_BUCKETS;
}

always_inline u64
l2fib_make_key (u8 * mac_address, u16 bd_index)
{
  u64 temp;

  /*
   * The mac address in memory is A:B:C:D:E:F
   * The bd id in register is H:L
   */
#if CLIB_ARCH_IS_LITTLE_ENDIAN
  /*
   * Create the in-register key as F:E:D:C:B:A:H:L
   * In memory the key is L:H:A:B:C:D:E:F
   */
  temp = *((u64 *) (mac_address)) << 16;
  temp = (temp & ~0xffff) | (u64) (bd_index);
#else
  /*
   * Create the in-register key as H:L:A:B:C:D:E:F
   * In memory the key is H:L:A:B:C:D:E:F
   */
  temp = *((u64 *) (mac_address)) >> 16;
  temp = temp | (((u64) bd_index) << 48);
#endif

  return temp;
}



/**
 * Lookup the entry for mac and bd_index in the mac table for 1 packet.
 * Cached_key and cached_result are used as a one-entry cache.
 * The function reads and updates them as needed.
 *
 * mac0 and bd_index0 are the keys. The entry is written to result0.
 * If the entry was not found, result0 is set to ~0.
 *
 * key0 and bucket0 return with the computed key and hash bucket,
 * convenient if the entry needs to be updated afterward.
 * If the cached_result was used, bucket0 is set to ~0.
 */

static_always_inline void
l2fib_lookup_1 (BVT (clib_bihash) * mac_table,
		l2fib_entry_key_t * cached_key,
		l2fib_entry_result_t * cached_result,
		u8 * mac0,
		u16 bd_index0,
		l2fib_entry_key_t * key0,
		u32 * bucket0, l2fib_entry_result_t * result0)
{
  /* set up key */
  key0->raw = l2fib_make_key (mac0, bd_index0);
  *bucket0 = ~0;

  if (key0->raw == cached_key->raw)
    {
      /* Hit in the one-entry cache */
      result0->raw = cached_result->raw;
    }
  else
    {
      /* Do a regular mac table lookup */
      BVT (clib_bihash_kv) kv;

      kv.key = key0->raw;
      kv.value = ~0ULL;
      BV (clib_bihash_search_inline) (mac_table, &kv);
      result0->raw = kv.value;

      /* Update one-entry cache */
      cached_key->raw = key0->raw;
      cached_result->raw = result0->raw;
    }
}


/**
 * Lookup the entry for mac and bd_index in the mac table for 2 packets.
 * The lookups for the two packets are interleaved.
 *
 * Cached_key and cached_result are used as a one-entry cache.
 * The function reads and updates them as needed.
 *
 * mac0 and bd_index0 are the keys. The entry is written to result0.
 * If the entry was not found, result0 is set to ~0. The same
 * holds for mac1/bd_index1/result1.
 */
static_always_inline void
l2fib_lookup_2 (BVT (clib_bihash) * mac_table,
		l2fib_entry_key_t * cached_key,
		l2fib_entry_result_t * cached_result,
		u8 * mac0,
		u8 * mac1,
		u16 bd_index0,
		u16 bd_index1,
		l2fib_entry_key_t * key0,
		l2fib_entry_key_t * key1,
		u32 * bucket0,
		u32 * bucket1,
		l2fib_entry_result_t * result0,
		l2fib_entry_result_t * result1)
{
  /* set up key */
  key0->raw = l2fib_make_key (mac0, bd_index0);
  key1->raw = l2fib_make_key (mac1, bd_index1);

  if ((key0->raw == cached_key->raw) && (key1->raw == cached_key->raw))
    {
      /* Both hit in the one-entry cache */
      result0->raw = cached_result->raw;
      result1->raw = cached_result->raw;
      *bucket0 = ~0;
      *bucket1 = ~0;

    }
  else
    {
      BVT (clib_bihash_kv) kv0, kv1;

      /*
       * Do a regular mac table lookup
       * Interleave lookups for packet 0 and packet 1
       */
      kv0.key = key0->raw;
      kv1.key = key1->raw;
      kv0.value = ~0ULL;
      kv1.value = ~0ULL;

      BV (clib_bihash_search_inline) (mac_table, &kv0);
      BV (clib_bihash_search_inline) (mac_table, &kv1);

      result0->raw = kv0.value;
      result1->raw = kv1.value;

      /* Update one-entry cache */
      cached_key->raw = key1->raw;
      cached_result->raw = result1->raw;
    }
}

static_always_inline void
l2fib_lookup_4 (BVT (clib_bihash) * mac_table,
		l2fib_entry_key_t * cached_key,
		l2fib_entry_result_t * cached_result,
		u8 * mac0,
		u8 * mac1,
		u8 * mac2,
		u8 * mac3,
		u16 bd_index0,
		u16 bd_index1,
		u16 bd_index2,
		u16 bd_index3,
		l2fib_entry_key_t * key0,
		l2fib_entry_key_t * key1,
		l2fib_entry_key_t * key2,
		l2fib_entry_key_t * key3,
		u32 * bucket0,
		u32 * bucket1,
		u32 * bucket2,
		u32 * bucket3,
		l2fib_entry_result_t * result0,
		l2fib_entry_result_t * result1,
		l2fib_entry_result_t * result2,
		l2fib_entry_result_t * result3)
{
  /* set up key */
  key0->raw = l2fib_make_key (mac0, bd_index0);
  key1->raw = l2fib_make_key (mac1, bd_index1);
  key2->raw = l2fib_make_key (mac2, bd_index2);
  key3->raw = l2fib_make_key (mac3, bd_index3);

  if ((key0->raw == cached_key->raw) && (key1->raw == cached_key->raw) &&
      (key2->raw == cached_key->raw) && (key3->raw == cached_key->raw))
    {
      /* Both hit in the one-entry cache */
      result0->raw = cached_result->raw;
      result1->raw = cached_result->raw;
      result2->raw = cached_result->raw;
      result3->raw = cached_result->raw;
      *bucket0 = ~0;
      *bucket1 = ~0;
      *bucket2 = ~0;
      *bucket3 = ~0;

    }
  else
    {
      BVT (clib_bihash_kv) kv0, kv1, kv2, kv3;

      /*
       * Do a regular mac table lookup
       * Interleave lookups for packet 0 and packet 1
       */
      kv0.key = key0->raw;
      kv1.key = key1->raw;
      kv2.key = key2->raw;
      kv3.key = key3->raw;
      kv0.value = ~0ULL;
      kv1.value = ~0ULL;
      kv2.value = ~0ULL;
      kv3.value = ~0ULL;

      BV (clib_bihash_search_inline) (mac_table, &kv0);
      BV (clib_bihash_search_inline) (mac_table, &kv1);
      BV (clib_bihash_search_inline) (mac_table, &kv2);
      BV (clib_bihash_search_inline) (mac_table, &kv3);

      result0->raw = kv0.value;
      result1->raw = kv1.value;
      result2->raw = kv2.value;
      result3->raw = kv3.value;

      /* Update one-entry cache */
      cached_key->raw = key1->raw;
      cached_result->raw = result1->raw;
    }
}

void l2fib_clear_table (void);

void
l2fib_add_entry (u64 mac,
		 u32 bd_index,
		 u32 sw_if_index, u32 static_mac, u32 drop_mac, u32 bvi_mac);

u32 l2fib_del_entry (u64 mac, u32 bd_index);

void l2fib_start_ager_scan (vlib_main_t * vm);

void l2fib_flush_int_mac (vlib_main_t * vm, u32 sw_if_index);

void l2fib_flush_bd_mac (vlib_main_t * vm, u32 bd_index);

void l2fib_flush_all_mac (vlib_main_t * vm);

void
l2fib_table_dump (u32 bd_index, l2fib_entry_key_t ** l2fe_key,
		  l2fib_entry_result_t ** l2fe_res);

u8 *format_vnet_sw_if_index_name_with_NA (u8 * s, va_list * args);

BVT (clib_bihash) * get_mac_table (void);

#endif

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