Line data Source code
1 : /*
2 : * l2_learn.c : layer 2 learning using l2fib
3 : *
4 : * Copyright (c) 2013 Cisco and/or its affiliates.
5 : * Licensed under the Apache License, Version 2.0 (the "License");
6 : * you may not use this file except in compliance with the License.
7 : * You may obtain a copy of the License at:
8 : *
9 : * http://www.apache.org/licenses/LICENSE-2.0
10 : *
11 : * Unless required by applicable law or agreed to in writing, software
12 : * distributed under the License is distributed on an "AS IS" BASIS,
13 : * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 : * See the License for the specific language governing permissions and
15 : * limitations under the License.
16 : */
17 :
18 : #include <vlib/vlib.h>
19 : #include <vnet/vnet.h>
20 : #include <vnet/ethernet/ethernet.h>
21 : #include <vlib/cli.h>
22 :
23 : #include <vnet/l2/l2_input.h>
24 : #include <vnet/l2/feat_bitmap.h>
25 : #include <vnet/l2/l2_fib.h>
26 : #include <vnet/l2/l2_learn.h>
27 :
28 : #include <vppinfra/error.h>
29 : #include <vppinfra/hash.h>
30 :
31 : #ifndef CLIB_MARCH_VARIANT
32 : l2learn_main_t l2learn_main;
33 : #endif
34 :
35 : /**
36 : * @file
37 : * @brief Ethernet Bridge Learning.
38 : *
39 : * Populate the mac table with entries mapping the packet's source mac + bridge
40 : * domain ID to the input sw_if_index.
41 : *
42 : * Note that learning and forwarding are separate graph nodes. This means that
43 : * for a set of packets, all learning is performed first, then all nodes are
44 : * forwarded. The forwarding is done based on the end-state of the mac table,
45 : * instead of the state after each packet. Thus the forwarding results could
46 : * differ in certain cases (mac move tests), but this not expected to cause
47 : * problems in real-world networks. It is much simpler to separate learning
48 : * and forwarding into separate nodes.
49 : */
50 :
51 :
52 : typedef struct
53 : {
54 : u8 src[6];
55 : u8 dst[6];
56 : u32 sw_if_index;
57 : u16 bd_index;
58 : } l2learn_trace_t;
59 :
60 :
61 : /* packet trace format function */
62 : static u8 *
63 4830 : format_l2learn_trace (u8 * s, va_list * args)
64 : {
65 4830 : CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
66 4830 : CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
67 4830 : l2learn_trace_t *t = va_arg (*args, l2learn_trace_t *);
68 :
69 4830 : s = format (s, "l2-learn: sw_if_index %d dst %U src %U bd_index %d",
70 : t->sw_if_index,
71 4830 : format_ethernet_address, t->dst,
72 4830 : format_ethernet_address, t->src, t->bd_index);
73 4830 : return s;
74 : }
75 :
76 : extern vlib_node_registration_t l2learn_node;
77 :
78 : #define foreach_l2learn_error \
79 : _(L2LEARN, "L2 learn packets") \
80 : _(MISS, "L2 learn misses") \
81 : _(MAC_MOVE, "L2 mac moves") \
82 : _(MAC_MOVE_VIOLATE, "L2 mac move violations") \
83 : _(LIMIT, "L2 not learned due to limit") \
84 : _(HIT_UPDATE, "L2 learn hit updates") \
85 : _(FILTER_DROP, "L2 filter mac drops")
86 :
87 : typedef enum
88 : {
89 : #define _(sym,str) L2LEARN_ERROR_##sym,
90 : foreach_l2learn_error
91 : #undef _
92 : L2LEARN_N_ERROR,
93 : } l2learn_error_t;
94 :
95 : static char *l2learn_error_strings[] = {
96 : #define _(sym,string) string,
97 : foreach_l2learn_error
98 : #undef _
99 : };
100 :
101 : typedef enum
102 : {
103 : L2LEARN_NEXT_L2FWD,
104 : L2LEARN_NEXT_DROP,
105 : L2LEARN_N_NEXT,
106 : } l2learn_next_t;
107 :
108 :
109 : /** Perform learning on one packet based on the mac table lookup result. */
110 :
111 : static_always_inline void
112 56207400 : l2learn_process (vlib_node_runtime_t * node,
113 : l2learn_main_t * msm,
114 : u64 * counter_base,
115 : vlib_buffer_t * b0,
116 : u32 sw_if_index0,
117 : l2fib_entry_key_t * key0,
118 : l2fib_entry_key_t * cached_key,
119 : u32 * count,
120 : l2fib_entry_result_t * result0, u16 * next0, u8 timestamp)
121 : {
122 56207400 : l2_bridge_domain_t *bd_config =
123 56207400 : vec_elt_at_index (l2input_main.bd_configs, vnet_buffer (b0)->l2.bd_index);
124 : /* Set up the default next node (typically L2FWD) */
125 56207400 : *next0 = vnet_l2_feature_next (b0, msm->feat_next_node_index,
126 : L2INPUT_FEAT_LEARN);
127 :
128 : /* Check mac table lookup result */
129 56207400 : if (PREDICT_TRUE (result0->fields.sw_if_index == sw_if_index0))
130 : {
131 : /* Entry in L2FIB with matching sw_if_index matched - normal fast path */
132 56205700 : u32 dtime = timestamp - result0->fields.timestamp;
133 56205700 : u32 dsn = (result0->fields.sn - vnet_buffer (b0)->l2.l2fib_sn);
134 56205700 : u32 check = (dtime && vnet_buffer (b0)->l2.bd_age) || dsn;
135 :
136 56205700 : if (PREDICT_TRUE (check == 0))
137 56205700 : return; /* MAC entry up to date */
138 1 : if (l2fib_entry_result_is_set_AGE_NOT (result0))
139 0 : return; /* Static MAC always age_not */
140 1 : if (msm->global_learn_count > msm->global_learn_limit)
141 0 : return; /* Above learn limit - do not update */
142 1 : if (bd_config->learn_count > bd_config->learn_limit)
143 0 : return; /* Above bridge domain learn limit - do not update */
144 :
145 : /* Limit updates per l2-learn node call to avoid prolonged update burst
146 : * as dtime advance over 1 minute mark, unless more than 1 min behind
147 : * or SN obsolete */
148 1 : if ((*count > 2) && (dtime == 1) && (dsn == 0))
149 0 : return;
150 :
151 1 : counter_base[L2LEARN_ERROR_HIT_UPDATE] += 1;
152 1 : *count += 1;
153 : }
154 1754 : else if (result0->raw == ~0)
155 : {
156 : /* Entry not in L2FIB - add it */
157 1671 : counter_base[L2LEARN_ERROR_MISS] += 1;
158 :
159 1671 : if ((msm->global_learn_count >= msm->global_learn_limit) ||
160 1660 : (bd_config->learn_count >= bd_config->learn_limit))
161 : {
162 : /*
163 : * Global limit reached. Do not learn the mac but forward the packet.
164 : * In the future, limits could also be per-interface or bridge-domain.
165 : */
166 42 : counter_base[L2LEARN_ERROR_LIMIT] += 1;
167 42 : return;
168 : }
169 :
170 : /* Do not learn if mac is 0 */
171 1629 : l2fib_entry_key_t key = *key0;
172 1629 : key.fields.bd_index = 0;
173 1629 : if (key.raw == 0)
174 0 : return;
175 :
176 : /* It is ok to learn */
177 : /* learn_count variable may have little inaccuracy because they are not
178 : * incremented/decremented with atomic operations */
179 : /* l2fib_scan is call every 2sec fixing potential inaccuracy */
180 1629 : msm->global_learn_count++;
181 1629 : bd_config->learn_count++;
182 1629 : result0->raw = 0; /* clear all fields */
183 1629 : result0->fields.sw_if_index = sw_if_index0;
184 1629 : if (msm->client_pid != 0)
185 139 : l2fib_entry_result_set_LRN_EVT (result0);
186 : else
187 1490 : l2fib_entry_result_clear_LRN_EVT (result0);
188 : }
189 : else
190 : {
191 : /* Entry in L2FIB with different sw_if_index - mac move or filter */
192 83 : if (l2fib_entry_result_is_set_FILTER (result0))
193 : {
194 0 : ASSERT (result0->fields.sw_if_index == ~0);
195 : /* drop packet because lookup matched a filter mac entry */
196 0 : b0->error = node->errors[L2LEARN_ERROR_FILTER_DROP];
197 0 : *next0 = L2LEARN_NEXT_DROP;
198 0 : return;
199 : }
200 :
201 83 : if (l2fib_entry_result_is_set_STATIC (result0))
202 : {
203 : /*
204 : * Don't overwrite a static mac
205 : * TODO: Check violation policy. For now drop the packet
206 : */
207 0 : b0->error = node->errors[L2LEARN_ERROR_MAC_MOVE_VIOLATE];
208 0 : *next0 = L2LEARN_NEXT_DROP;
209 0 : return;
210 : }
211 :
212 : /*
213 : * TODO: may want to rate limit mac moves
214 : * TODO: check global/bridge domain/interface learn limits
215 : */
216 83 : result0->fields.sw_if_index = sw_if_index0;
217 83 : if (l2fib_entry_result_is_set_AGE_NOT (result0))
218 : {
219 : /* The mac was provisioned */
220 : /* learn_count variable may have little inaccuracy because they are
221 : * not incremented/decremented with atomic operations */
222 : /* l2fib_scan is call every 2sec fixing potential inaccuracy */
223 0 : msm->global_learn_count++;
224 0 : bd_config->learn_count++;
225 :
226 0 : l2fib_entry_result_clear_AGE_NOT (result0);
227 : }
228 83 : if (msm->client_pid != 0)
229 0 : l2fib_entry_result_set_bits (result0,
230 : (L2FIB_ENTRY_RESULT_FLAG_LRN_EVT |
231 : L2FIB_ENTRY_RESULT_FLAG_LRN_MOV));
232 : else
233 83 : l2fib_entry_result_clear_bits (result0,
234 : (L2FIB_ENTRY_RESULT_FLAG_LRN_EVT |
235 : L2FIB_ENTRY_RESULT_FLAG_LRN_MOV));
236 83 : counter_base[L2LEARN_ERROR_MAC_MOVE] += 1;
237 : }
238 :
239 : /* Update the entry */
240 1713 : result0->fields.timestamp = timestamp;
241 1713 : result0->fields.sn = vnet_buffer (b0)->l2.l2fib_sn;
242 :
243 : BVT (clib_bihash_kv) kv;
244 1713 : kv.key = key0->raw;
245 1713 : kv.value = result0->raw;
246 1713 : BV (clib_bihash_add_del) (msm->mac_table, &kv, 1 /* is_add */ );
247 :
248 : /* Invalidate the cache */
249 1713 : cached_key->raw = ~0;
250 : }
251 :
252 :
253 : static_always_inline uword
254 1071750 : l2learn_node_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
255 : vlib_frame_t * frame, int do_trace)
256 : {
257 : u32 n_left, *from;
258 1071750 : l2learn_main_t *msm = &l2learn_main;
259 1071750 : vlib_node_t *n = vlib_get_node (vm, l2learn_node.index);
260 1071750 : u32 node_counter_base_index = n->error_heap_index;
261 1071750 : vlib_error_main_t *em = &vm->error_main;
262 : l2fib_entry_key_t cached_key;
263 : l2fib_entry_result_t cached_result;
264 1071750 : u8 timestamp = (u8) (vlib_time_now (vm) / 60);
265 1071750 : u32 count = 0;
266 : vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
267 : u16 nexts[VLIB_FRAME_SIZE], *next;
268 :
269 1071750 : from = vlib_frame_vector_args (frame);
270 1071750 : n_left = frame->n_vectors; /* number of packets to process */
271 1071750 : vlib_get_buffers (vm, from, bufs, n_left);
272 1071750 : next = nexts;
273 1071750 : b = bufs;
274 :
275 : /* Clear the one-entry cache in case mac table was updated */
276 1071750 : cached_key.raw = ~0;
277 1071750 : cached_result.raw = ~0; /* warning be gone */
278 :
279 13666500 : while (n_left > 8)
280 : {
281 : u32 sw_if_index0, sw_if_index1, sw_if_index2, sw_if_index3;
282 : const ethernet_header_t *h0, *h1, *h2, *h3;
283 : l2fib_entry_key_t key0, key1, key2, key3;
284 : l2fib_entry_result_t result0, result1, result2, result3;
285 :
286 : /* Prefetch next iteration. */
287 : {
288 : /* buffer header is read and written, so use LOAD
289 : * prefetch */
290 12594800 : vlib_prefetch_buffer_header (b[4], LOAD);
291 12594800 : vlib_prefetch_buffer_header (b[5], LOAD);
292 12594800 : vlib_prefetch_buffer_header (b[6], LOAD);
293 12594800 : vlib_prefetch_buffer_header (b[7], LOAD);
294 :
295 12594800 : clib_prefetch_load (b[4]->data);
296 12594800 : clib_prefetch_load (b[5]->data);
297 12594800 : clib_prefetch_load (b[6]->data);
298 12594800 : clib_prefetch_load (b[7]->data);
299 : }
300 :
301 : /* RX interface handles */
302 12594800 : sw_if_index0 = vnet_buffer (b[0])->sw_if_index[VLIB_RX];
303 12594800 : sw_if_index1 = vnet_buffer (b[1])->sw_if_index[VLIB_RX];
304 12594800 : sw_if_index2 = vnet_buffer (b[2])->sw_if_index[VLIB_RX];
305 12594800 : sw_if_index3 = vnet_buffer (b[3])->sw_if_index[VLIB_RX];
306 :
307 : /* Process 4 x pkts */
308 :
309 12594800 : h0 = vlib_buffer_get_current (b[0]);
310 12594800 : h1 = vlib_buffer_get_current (b[1]);
311 12594800 : h2 = vlib_buffer_get_current (b[2]);
312 12594800 : h3 = vlib_buffer_get_current (b[3]);
313 :
314 12594800 : if (do_trace)
315 : {
316 1319 : if (b[0]->flags & VLIB_BUFFER_IS_TRACED)
317 : {
318 : l2learn_trace_t *t =
319 1319 : vlib_add_trace (vm, node, b[0], sizeof (*t));
320 1319 : t->sw_if_index = sw_if_index0;
321 1319 : t->bd_index = vnet_buffer (b[0])->l2.bd_index;
322 1319 : clib_memcpy_fast (t->src, h0->src_address, 6);
323 1319 : clib_memcpy_fast (t->dst, h0->dst_address, 6);
324 : }
325 1319 : if (b[1]->flags & VLIB_BUFFER_IS_TRACED)
326 : {
327 : l2learn_trace_t *t =
328 1319 : vlib_add_trace (vm, node, b[1], sizeof (*t));
329 1319 : t->sw_if_index = sw_if_index1;
330 1319 : t->bd_index = vnet_buffer (b[1])->l2.bd_index;
331 1319 : clib_memcpy_fast (t->src, h1->src_address, 6);
332 1319 : clib_memcpy_fast (t->dst, h1->dst_address, 6);
333 : }
334 1319 : if (b[2]->flags & VLIB_BUFFER_IS_TRACED)
335 : {
336 : l2learn_trace_t *t =
337 1319 : vlib_add_trace (vm, node, b[2], sizeof (*t));
338 1319 : t->sw_if_index = sw_if_index2;
339 1319 : t->bd_index = vnet_buffer (b[2])->l2.bd_index;
340 1319 : clib_memcpy_fast (t->src, h2->src_address, 6);
341 1319 : clib_memcpy_fast (t->dst, h2->dst_address, 6);
342 : }
343 1319 : if (b[3]->flags & VLIB_BUFFER_IS_TRACED)
344 : {
345 : l2learn_trace_t *t =
346 1319 : vlib_add_trace (vm, node, b[3], sizeof (*t));
347 1319 : t->sw_if_index = sw_if_index3;
348 1319 : t->bd_index = vnet_buffer (b[3])->l2.bd_index;
349 1319 : clib_memcpy_fast (t->src, h3->src_address, 6);
350 1319 : clib_memcpy_fast (t->dst, h3->dst_address, 6);
351 : }
352 : }
353 :
354 : /* process 4 pkts */
355 12594800 : vlib_node_increment_counter (vm, l2learn_node.index,
356 : L2LEARN_ERROR_L2LEARN, 4);
357 :
358 12594800 : l2fib_lookup_4 (msm->mac_table, &cached_key, &cached_result,
359 12594800 : h0->src_address,
360 12594800 : h1->src_address,
361 12594800 : h2->src_address,
362 12594800 : h3->src_address,
363 12594800 : vnet_buffer (b[0])->l2.bd_index,
364 12594800 : vnet_buffer (b[1])->l2.bd_index,
365 12594800 : vnet_buffer (b[2])->l2.bd_index,
366 12594800 : vnet_buffer (b[3])->l2.bd_index,
367 : &key0, &key1, &key2, &key3,
368 : &result0, &result1, &result2, &result3);
369 :
370 12594800 : l2learn_process (node, msm, &em->counters[node_counter_base_index],
371 : b[0], sw_if_index0, &key0, &cached_key,
372 : &count, &result0, next, timestamp);
373 :
374 12594800 : l2learn_process (node, msm, &em->counters[node_counter_base_index],
375 12594800 : b[1], sw_if_index1, &key1, &cached_key,
376 : &count, &result1, next + 1, timestamp);
377 :
378 12594800 : l2learn_process (node, msm, &em->counters[node_counter_base_index],
379 12594800 : b[2], sw_if_index2, &key2, &cached_key,
380 : &count, &result2, next + 2, timestamp);
381 :
382 12594800 : l2learn_process (node, msm, &em->counters[node_counter_base_index],
383 12594800 : b[3], sw_if_index3, &key3, &cached_key,
384 : &count, &result3, next + 3, timestamp);
385 :
386 12594800 : next += 4;
387 12594800 : b += 4;
388 12594800 : n_left -= 4;
389 : }
390 :
391 6900120 : while (n_left > 0)
392 : {
393 : u32 sw_if_index0;
394 : ethernet_header_t *h0;
395 : l2fib_entry_key_t key0;
396 : l2fib_entry_result_t result0;
397 :
398 5828380 : sw_if_index0 = vnet_buffer (b[0])->sw_if_index[VLIB_RX];
399 :
400 5828380 : h0 = vlib_buffer_get_current (b[0]);
401 :
402 5828380 : if (do_trace && PREDICT_FALSE (b[0]->flags & VLIB_BUFFER_IS_TRACED))
403 : {
404 1068 : l2learn_trace_t *t = vlib_add_trace (vm, node, b[0], sizeof (*t));
405 1068 : t->sw_if_index = sw_if_index0;
406 1068 : t->bd_index = vnet_buffer (b[0])->l2.bd_index;
407 1068 : clib_memcpy_fast (t->src, h0->src_address, 6);
408 1068 : clib_memcpy_fast (t->dst, h0->dst_address, 6);
409 : }
410 :
411 : /* process 1 pkt */
412 5828380 : vlib_node_increment_counter (vm, l2learn_node.index,
413 : L2LEARN_ERROR_L2LEARN, 1);
414 :
415 :
416 5828380 : l2fib_lookup_1 (msm->mac_table, &cached_key, &cached_result,
417 5828380 : h0->src_address, vnet_buffer (b[0])->l2.bd_index,
418 : &key0, &result0);
419 :
420 5828380 : l2learn_process (node, msm, &em->counters[node_counter_base_index],
421 : b[0], sw_if_index0, &key0, &cached_key,
422 : &count, &result0, next, timestamp);
423 :
424 5828380 : next += 1;
425 5828380 : b += 1;
426 5828380 : n_left -= 1;
427 : }
428 :
429 1071750 : vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
430 :
431 1071750 : return frame->n_vectors;
432 : }
433 :
434 1074050 : VLIB_NODE_FN (l2learn_node) (vlib_main_t * vm,
435 : vlib_node_runtime_t * node, vlib_frame_t * frame)
436 : {
437 1071750 : if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)))
438 292 : return l2learn_node_inline (vm, node, frame, 1 /* do_trace */ );
439 1071450 : return l2learn_node_inline (vm, node, frame, 0 /* do_trace */ );
440 : }
441 :
442 : /* *INDENT-OFF* */
443 183788 : VLIB_REGISTER_NODE (l2learn_node) = {
444 : .name = "l2-learn",
445 : .vector_size = sizeof (u32),
446 : .format_trace = format_l2learn_trace,
447 : .type = VLIB_NODE_TYPE_INTERNAL,
448 :
449 : .n_errors = ARRAY_LEN(l2learn_error_strings),
450 : .error_strings = l2learn_error_strings,
451 :
452 : .n_next_nodes = L2LEARN_N_NEXT,
453 :
454 : /* edit / add dispositions here */
455 : .next_nodes = {
456 : [L2LEARN_NEXT_DROP] = "error-drop",
457 : [L2LEARN_NEXT_L2FWD] = "l2-fwd",
458 : },
459 : };
460 : /* *INDENT-ON* */
461 :
462 : #ifndef CLIB_MARCH_VARIANT
463 : clib_error_t *
464 575 : l2learn_init (vlib_main_t * vm)
465 : {
466 575 : l2learn_main_t *mp = &l2learn_main;
467 :
468 575 : mp->vlib_main = vm;
469 575 : mp->vnet_main = vnet_get_main ();
470 :
471 : /* Initialize the feature next-node indexes */
472 575 : feat_bitmap_init_next_nodes (vm,
473 : l2learn_node.index,
474 : L2INPUT_N_FEAT,
475 : l2input_get_feat_names (),
476 575 : mp->feat_next_node_index);
477 :
478 : /* init the hash table ptr */
479 575 : mp->mac_table = get_mac_table ();
480 :
481 : /*
482 : * Set the default number of dynamically learned macs to the number
483 : * of buckets.
484 : */
485 575 : mp->global_learn_limit = L2LEARN_DEFAULT_LIMIT;
486 :
487 : /*
488 : * Set the default number of dynamically learned macs to the number
489 : * of buckets.
490 : */
491 575 : mp->bd_default_learn_limit = L2LEARN_DEFAULT_LIMIT;
492 575 : return 0;
493 : }
494 :
495 21311 : VLIB_INIT_FUNCTION (l2learn_init);
496 :
497 :
498 : /**
499 : * Set subinterface learn enable/disable.
500 : * The CLI format is:
501 : * set interface l2 learn <interface> [disable]
502 : */
503 : static clib_error_t *
504 0 : int_learn (vlib_main_t * vm,
505 : unformat_input_t * input, vlib_cli_command_t * cmd)
506 : {
507 0 : vnet_main_t *vnm = vnet_get_main ();
508 0 : clib_error_t *error = 0;
509 : u32 sw_if_index;
510 : u32 enable;
511 :
512 0 : if (!unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index))
513 : {
514 0 : error = clib_error_return (0, "unknown interface `%U'",
515 : format_unformat_error, input);
516 0 : goto done;
517 : }
518 :
519 0 : enable = 1;
520 0 : if (unformat (input, "disable"))
521 : {
522 0 : enable = 0;
523 : }
524 :
525 : /* set the interface flag */
526 0 : l2input_intf_bitmap_enable (sw_if_index, L2INPUT_FEAT_LEARN, enable);
527 :
528 0 : done:
529 0 : return error;
530 : }
531 :
532 : /*?
533 : * Layer 2 learning can be enabled and disabled on each
534 : * interface and on each bridge-domain. Use this command to
535 : * manage interfaces. It is enabled by default.
536 : *
537 : * @cliexpar
538 : * Example of how to enable learning:
539 : * @cliexcmd{set interface l2 learn GigabitEthernet0/8/0}
540 : * Example of how to disable learning:
541 : * @cliexcmd{set interface l2 learn GigabitEthernet0/8/0 disable}
542 : ?*/
543 : /* *INDENT-OFF* */
544 285289 : VLIB_CLI_COMMAND (int_learn_cli, static) = {
545 : .path = "set interface l2 learn",
546 : .short_help = "set interface l2 learn <interface> [disable]",
547 : .function = int_learn,
548 : };
549 : /* *INDENT-ON* */
550 :
551 :
552 : static clib_error_t *
553 575 : l2learn_config (vlib_main_t * vm, unformat_input_t * input)
554 : {
555 575 : l2learn_main_t *mp = &l2learn_main;
556 :
557 575 : while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
558 : {
559 0 : if (unformat (input, "limit %d", &mp->global_learn_limit))
560 : ;
561 :
562 : else
563 0 : return clib_error_return (0, "unknown input `%U'",
564 : format_unformat_error, input);
565 : }
566 :
567 575 : return 0;
568 : }
569 :
570 7514 : VLIB_CONFIG_FUNCTION (l2learn_config, "l2learn");
571 :
572 : #endif
573 :
574 :
575 : /*
576 : * fd.io coding-style-patch-verification: ON
577 : *
578 : * Local Variables:
579 : * eval: (c-set-style "gnu")
580 : * End:
581 : */
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