2 * Copyright (c) 2015 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
16 * buffer.c: allocate/free network buffers.
18 * Copyright (c) 2008 Eliot Dresselhaus
20 * Permission is hereby granted, free of charge, to any person obtaining
21 * a copy of this software and associated documentation files (the
22 * "Software"), to deal in the Software without restriction, including
23 * without limitation the rights to use, copy, modify, merge, publish,
24 * distribute, sublicense, and/or sell copies of the Software, and to
25 * permit persons to whom the Software is furnished to do so, subject to
26 * the following conditions:
28 * The above copyright notice and this permission notice shall be
29 * included in all copies or substantial portions of the Software.
31 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
32 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
33 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
34 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
35 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
36 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
37 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
43 * Allocate/free network buffers.
46 #include <vlib/vlib.h>
47 #include <vlib/unix/unix.h>
49 vlib_buffer_callbacks_t *vlib_buffer_callbacks = 0;
51 /* when running unpriviledged we are limited by RLIMIT_MEMLOCK which is
52 typically set to 16MB so setting default size for buffer memory to 14MB
54 static u32 vlib_buffer_physmem_sz = 14 << 20;
57 static vlib_log_class_t buffer_log_default;
60 vlib_buffer_length_in_chain_slow_path (vlib_main_t * vm,
61 vlib_buffer_t * b_first)
63 vlib_buffer_t *b = b_first;
64 uword l_first = b_first->current_length;
66 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
68 b = vlib_get_buffer (vm, b->next_buffer);
69 l += b->current_length;
71 b_first->total_length_not_including_first_buffer = l;
72 b_first->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
77 format_vlib_buffer (u8 * s, va_list * args)
79 vlib_buffer_t *b = va_arg (*args, vlib_buffer_t *);
80 u32 indent = format_get_indent (s);
83 #define _(bit, name, v) \
84 if (v && (b->flags & VLIB_BUFFER_##name)) \
85 a = format (a, "%s ", v);
86 foreach_vlib_buffer_flag
88 s = format (s, "current data %d, length %d, buffer-pool %d, "
89 "clone-count %u", b->current_data, b->current_length,
90 b->buffer_pool_index, b->n_add_refs);
92 if (b->flags & VLIB_BUFFER_TOTAL_LENGTH_VALID)
93 s = format (s, ", totlen-nifb %d",
94 b->total_length_not_including_first_buffer);
96 if (b->flags & VLIB_BUFFER_IS_TRACED)
97 s = format (s, ", trace 0x%x", b->trace_index);
100 s = format (s, "\n%U%v", format_white_space, indent, a);
103 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
105 vlib_main_t *vm = vlib_get_main ();
106 u32 next_buffer = b->next_buffer;
107 b = vlib_get_buffer (vm, next_buffer);
110 format (s, "\n%Unext-buffer 0x%x, segment length %d, clone-count %u",
111 format_white_space, indent, next_buffer, b->current_length,
119 format_vlib_buffer_and_data (u8 * s, va_list * args)
121 vlib_buffer_t *b = va_arg (*args, vlib_buffer_t *);
123 s = format (s, "%U, %U",
124 format_vlib_buffer, b,
125 format_hex_bytes, vlib_buffer_get_current (b), 64);
131 format_vlib_buffer_known_state (u8 * s, va_list * args)
133 vlib_buffer_known_state_t state = va_arg (*args, vlib_buffer_known_state_t);
138 case VLIB_BUFFER_UNKNOWN:
142 case VLIB_BUFFER_KNOWN_ALLOCATED:
143 t = "known-allocated";
146 case VLIB_BUFFER_KNOWN_FREE:
155 return format (s, "%s", t);
159 format_vlib_buffer_contents (u8 * s, va_list * va)
161 vlib_main_t *vm = va_arg (*va, vlib_main_t *);
162 vlib_buffer_t *b = va_arg (*va, vlib_buffer_t *);
166 vec_add (s, vlib_buffer_get_current (b), b->current_length);
167 if (!(b->flags & VLIB_BUFFER_NEXT_PRESENT))
169 b = vlib_get_buffer (vm, b->next_buffer);
176 vlib_validate_buffer_helper (vlib_main_t * vm,
178 uword follow_buffer_next, uword ** unique_hash)
180 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
182 if ((signed) b->current_data < (signed) -VLIB_BUFFER_PRE_DATA_SIZE)
183 return format (0, "current data %d before pre-data", b->current_data);
185 if (b->current_data + b->current_length > VLIB_BUFFER_DATA_SIZE)
186 return format (0, "%d-%d beyond end of buffer %d",
187 b->current_data, b->current_length, VLIB_BUFFER_DATA_SIZE);
189 if (follow_buffer_next && (b->flags & VLIB_BUFFER_NEXT_PRESENT))
191 vlib_buffer_known_state_t k;
194 k = vlib_buffer_is_known (vm, b->next_buffer);
195 if (k != VLIB_BUFFER_KNOWN_ALLOCATED)
196 return format (0, "next 0x%x: %U",
197 b->next_buffer, format_vlib_buffer_known_state, k);
201 if (hash_get (*unique_hash, b->next_buffer))
202 return format (0, "duplicate buffer 0x%x", b->next_buffer);
204 hash_set1 (*unique_hash, b->next_buffer);
207 msg = vlib_validate_buffer (vm, b->next_buffer, follow_buffer_next);
210 result = format (0, "next 0x%x: %v", b->next_buffer, msg);
220 vlib_validate_buffer (vlib_main_t * vm, u32 bi, uword follow_buffer_next)
222 return vlib_validate_buffer_helper (vm, bi, follow_buffer_next,
223 /* unique_hash */ 0);
227 vlib_validate_buffers (vlib_main_t * vm,
229 uword next_buffer_stride,
231 vlib_buffer_known_state_t known_state,
232 uword follow_buffer_next)
235 u32 bi, *b = buffers;
236 vlib_buffer_known_state_t k;
237 u8 *msg = 0, *result = 0;
239 hash = hash_create (0, 0);
240 for (i = 0; i < n_buffers; i++)
243 b += next_buffer_stride;
245 /* Buffer is not unique. */
246 if (hash_get (hash, bi))
248 msg = format (0, "not unique");
252 k = vlib_buffer_is_known (vm, bi);
253 if (k != known_state)
255 msg = format (0, "is %U; expected %U",
256 format_vlib_buffer_known_state, k,
257 format_vlib_buffer_known_state, known_state);
261 msg = vlib_validate_buffer_helper (vm, bi, follow_buffer_next, &hash);
265 hash_set1 (hash, bi);
271 result = format (0, "0x%x: %v", bi, msg);
279 * Hand-craft a static vector w/ length 1, so vec_len(vlib_mains) =1
280 * and vlib_mains[0] = &vlib_global_main from the beginning of time.
282 * The only place which should ever expand vlib_mains is start_workers()
283 * in threads.c. It knows about the bootstrap vector.
290 } __attribute__ ((packed)) __bootstrap_vlib_main_vector
291 __attribute__ ((aligned (CLIB_CACHE_LINE_BYTES))) =
294 .vm = &vlib_global_main,
298 vlib_main_t **vlib_mains = &__bootstrap_vlib_main_vector.vm;
301 /* When dubugging validate that given buffers are either known allocated
304 vlib_buffer_validate_alloc_free (vlib_main_t * vm,
307 vlib_buffer_known_state_t expected_state)
310 uword i, bi, is_free;
315 if (vlib_buffer_callbacks)
318 is_free = expected_state == VLIB_BUFFER_KNOWN_ALLOCATED;
320 for (i = 0; i < n_buffers; i++)
322 vlib_buffer_known_state_t known;
326 known = vlib_buffer_is_known (vm, bi);
327 if (known != expected_state)
331 (vm, "%s %U buffer 0x%x",
332 is_free ? "freeing" : "allocating",
333 format_vlib_buffer_known_state, known, bi);
336 vlib_buffer_set_known_state (vm, bi, is_free ? VLIB_BUFFER_KNOWN_FREE :
337 VLIB_BUFFER_KNOWN_ALLOCATED);
341 /* Add buffer free list. */
342 static vlib_buffer_free_list_index_t
343 vlib_buffer_create_free_list_helper (vlib_main_t * vm,
345 u32 is_public, u32 is_default, u8 * name)
347 vlib_buffer_main_t *bm = vm->buffer_main;
348 vlib_buffer_free_list_t *f;
351 ASSERT (vlib_get_thread_index () == 0);
353 if (!is_default && pool_elts (vm->buffer_free_list_pool) == 0)
355 vlib_buffer_free_list_index_t default_free_free_list_index;
358 default_free_free_list_index =
359 vlib_buffer_create_free_list_helper
361 /* default buffer size */ VLIB_BUFFER_DATA_SIZE,
366 ASSERT (default_free_free_list_index ==
367 VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX);
369 if (n_data_bytes == VLIB_BUFFER_DATA_SIZE && is_public)
370 return default_free_free_list_index;
373 pool_get_aligned (vm->buffer_free_list_pool, f, CLIB_CACHE_LINE_BYTES);
375 clib_memset (f, 0, sizeof (f[0]));
376 f->index = f - vm->buffer_free_list_pool;
377 vec_validate (f->buffers, 0);
378 vec_reset_length (f->buffers);
379 f->min_n_buffers_each_alloc = VLIB_FRAME_SIZE;
380 f->buffer_pool_index = 0;
381 f->name = clib_mem_is_vec (name) ? name : format (0, "%s", name);
383 /* Setup free buffer template. */
384 f->buffer_init_template.n_add_refs = 0;
388 uword *p = hash_get (bm->free_list_by_size, VLIB_BUFFER_DATA_SIZE);
390 hash_set (bm->free_list_by_size, VLIB_BUFFER_DATA_SIZE, f->index);
393 for (i = 1; i < vec_len (vlib_mains); i++)
395 vlib_main_t *wvm = vlib_mains[i];
396 vlib_buffer_free_list_t *wf;
397 pool_get_aligned (wvm->buffer_free_list_pool,
398 wf, CLIB_CACHE_LINE_BYTES);
399 ASSERT (f - vm->buffer_free_list_pool ==
400 wf - wvm->buffer_free_list_pool);
403 vec_validate (wf->buffers, 0);
404 vec_reset_length (wf->buffers);
411 vlib_buffer_free_list_index_t
412 vlib_buffer_create_free_list (vlib_main_t * vm, u32 n_data_bytes,
419 name = va_format (0, fmt, &va);
422 return vlib_buffer_create_free_list_helper (vm, n_data_bytes,
428 static_always_inline void *
429 vlib_buffer_pool_get_buffer (vlib_main_t * vm, vlib_buffer_pool_t * bp)
431 return vlib_physmem_alloc_from_map (vm, bp->physmem_map_index,
432 bp->buffer_size, CLIB_CACHE_LINE_BYTES);
435 /* Make sure free list has at least given number of free buffers. */
437 vlib_buffer_fill_free_list_internal (vlib_main_t * vm,
438 vlib_buffer_free_list_t * fl,
439 uword min_free_buffers)
442 vlib_buffer_pool_t *bp = vlib_buffer_pool_get (vm, fl->buffer_pool_index);
447 /* Already have enough free buffers on free list? */
448 n = min_free_buffers - vec_len (fl->buffers);
450 return min_free_buffers;
452 if (vec_len (bp->buffers) > 0)
455 clib_spinlock_lock (&bp->lock);
456 n_copy = clib_min (vec_len (bp->buffers), n);
457 n_left = vec_len (bp->buffers) - n_copy;
458 vec_add_aligned (fl->buffers, bp->buffers + n_left, n_copy,
459 CLIB_CACHE_LINE_BYTES);
460 _vec_len (bp->buffers) = n_left;
461 clib_spinlock_unlock (&bp->lock);
462 n = min_free_buffers - vec_len (fl->buffers);
464 return min_free_buffers;
467 /* Always allocate round number of buffers. */
468 n = round_pow2 (n, CLIB_CACHE_LINE_BYTES / sizeof (u32));
470 /* Always allocate new buffers in reasonably large sized chunks. */
471 n = clib_max (n, fl->min_n_buffers_each_alloc);
473 clib_spinlock_lock (&bp->lock);
476 if ((b = vlib_buffer_pool_get_buffer (vm, bp)) == 0)
481 vec_add2_aligned (fl->buffers, bi, 1, CLIB_CACHE_LINE_BYTES);
482 bi[0] = vlib_get_buffer_index (vm, b);
485 vlib_buffer_set_known_state (vm, bi[0], VLIB_BUFFER_KNOWN_FREE);
487 clib_memset (b, 0, sizeof (vlib_buffer_t));
489 if (fl->buffer_init_function)
490 fl->buffer_init_function (vm, fl, bi, 1);
494 clib_spinlock_unlock (&bp->lock);
495 fl->n_alloc += n_alloc;
500 vlib_set_buffer_free_callback (vlib_main_t * vm, void *fp)
502 vlib_buffer_main_t *bm = vm->buffer_main;
503 void *rv = bm->buffer_free_callback;
505 bm->buffer_free_callback = fp;
509 static_always_inline void
510 recycle_or_free (vlib_main_t * vm, vlib_buffer_main_t * bm, u32 bi,
511 vlib_buffer_t * b, u32 follow_buffer_next)
513 vlib_buffer_free_list_t *fl;
516 fl = pool_elt_at_index (vm->buffer_free_list_pool,
517 VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX);
521 vlib_buffer_t *nb = vlib_get_buffer (vm, bi);
523 next = nb->next_buffer;
528 vlib_buffer_validate_alloc_free (vm, &bi, 1,
529 VLIB_BUFFER_KNOWN_ALLOCATED);
530 vlib_buffer_add_to_free_list (vm, fl, bi, 1);
534 while (follow_buffer_next && (flags & VLIB_BUFFER_NEXT_PRESENT));
537 static_always_inline void
538 vlib_buffer_free_inline (vlib_main_t * vm,
539 u32 * buffers, u32 n_buffers, u32 follow_buffer_next)
541 vlib_buffer_main_t *bm = vm->buffer_main;
542 vlib_buffer_t *p, *b0, *b1, *b2, *b3;
544 u32 (*cb) (vlib_main_t * vm, u32 * buffers, u32 n_buffers,
545 u32 follow_buffer_next);
547 cb = bm->buffer_free_callback;
549 if (PREDICT_FALSE (cb != 0))
550 n_buffers = (*cb) (vm, buffers, n_buffers, follow_buffer_next);
555 while (i + 11 < n_buffers)
557 p = vlib_get_buffer (vm, buffers[i + 8]);
558 vlib_prefetch_buffer_header (p, LOAD);
559 p = vlib_get_buffer (vm, buffers[i + 9]);
560 vlib_prefetch_buffer_header (p, LOAD);
561 p = vlib_get_buffer (vm, buffers[i + 10]);
562 vlib_prefetch_buffer_header (p, LOAD);
563 p = vlib_get_buffer (vm, buffers[i + 11]);
564 vlib_prefetch_buffer_header (p, LOAD);
566 b0 = vlib_get_buffer (vm, buffers[i]);
567 b1 = vlib_get_buffer (vm, buffers[i + 1]);
568 b2 = vlib_get_buffer (vm, buffers[i + 2]);
569 b3 = vlib_get_buffer (vm, buffers[i + 3]);
571 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
572 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b1);
573 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b2);
574 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b3);
576 recycle_or_free (vm, bm, buffers[i], b0, follow_buffer_next);
577 recycle_or_free (vm, bm, buffers[i + 1], b1, follow_buffer_next);
578 recycle_or_free (vm, bm, buffers[i + 2], b2, follow_buffer_next);
579 recycle_or_free (vm, bm, buffers[i + 3], b3, follow_buffer_next);
584 while (i < n_buffers)
586 b0 = vlib_get_buffer (vm, buffers[i]);
587 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
588 recycle_or_free (vm, bm, buffers[i], b0, follow_buffer_next);
594 vlib_buffer_free_internal (vlib_main_t * vm, u32 * buffers, u32 n_buffers)
596 vlib_buffer_free_inline (vm, buffers, n_buffers, /* follow_buffer_next */
601 vlib_buffer_free_no_next_internal (vlib_main_t * vm, u32 * buffers,
604 vlib_buffer_free_inline (vm, buffers, n_buffers, /* follow_buffer_next */
609 vlib_packet_template_init (vlib_main_t * vm,
610 vlib_packet_template_t * t,
612 uword n_packet_data_bytes,
613 uword min_n_buffers_each_alloc, char *fmt, ...)
618 t->name = va_format (0, fmt, &va);
621 vlib_worker_thread_barrier_sync (vm);
623 clib_memset (t, 0, sizeof (t[0]));
625 vec_add (t->packet_data, packet_data, n_packet_data_bytes);
626 t->min_n_buffers_each_alloc = min_n_buffers_each_alloc;
628 vlib_worker_thread_barrier_release (vm);
632 vlib_packet_template_get_packet (vlib_main_t * vm,
633 vlib_packet_template_t * t, u32 * bi_result)
638 if (vlib_buffer_alloc (vm, &bi, 1) != 1)
643 b = vlib_get_buffer (vm, bi);
644 clib_memcpy_fast (vlib_buffer_get_current (b),
645 t->packet_data, vec_len (t->packet_data));
646 b->current_length = vec_len (t->packet_data);
651 /* Append given data to end of buffer, possibly allocating new buffers. */
653 vlib_buffer_add_data (vlib_main_t * vm, u32 * buffer_index, void *data,
656 u32 n_buffer_bytes, n_left, n_left_this_buffer, bi;
661 if (bi == ~0 && 1 != vlib_buffer_alloc (vm, &bi, 1))
665 n_left = n_data_bytes;
666 n_buffer_bytes = VLIB_BUFFER_DATA_SIZE;
668 b = vlib_get_buffer (vm, bi);
669 b->flags &= ~VLIB_BUFFER_TOTAL_LENGTH_VALID;
671 /* Get to the end of the chain before we try to append data... */
672 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
673 b = vlib_get_buffer (vm, b->next_buffer);
679 ASSERT (n_buffer_bytes >= b->current_length);
681 n_buffer_bytes - (b->current_data + b->current_length);
682 n = clib_min (n_left_this_buffer, n_left);
683 clib_memcpy_fast (vlib_buffer_get_current (b) + b->current_length, d,
685 b->current_length += n;
691 if (1 != vlib_buffer_alloc (vm, &b->next_buffer, 1))
694 b->flags |= VLIB_BUFFER_NEXT_PRESENT;
696 b = vlib_get_buffer (vm, b->next_buffer);
703 clib_warning ("out of buffers");
708 vlib_buffer_chain_append_data_with_alloc (vlib_main_t * vm,
709 vlib_buffer_free_list_index_t
711 vlib_buffer_t * first,
712 vlib_buffer_t ** last, void *data,
715 vlib_buffer_t *l = *last;
716 u32 n_buffer_bytes = VLIB_BUFFER_DATA_SIZE;
718 ASSERT (n_buffer_bytes >= l->current_length + l->current_data);
721 u16 max = n_buffer_bytes - l->current_length - l->current_data;
725 vlib_buffer_alloc_from_free_list (vm, &l->next_buffer, 1,
728 *last = l = vlib_buffer_chain_buffer (vm, l, l->next_buffer);
729 max = n_buffer_bytes - l->current_length - l->current_data;
732 u16 len = (data_len > max) ? max : data_len;
733 clib_memcpy_fast (vlib_buffer_get_current (l) + l->current_length,
735 vlib_buffer_chain_increase_length (first, l, len);
743 vlib_buffer_register_physmem_map (vlib_main_t * vm, u32 physmem_map_index)
745 vlib_buffer_main_t *bm = vm->buffer_main;
746 vlib_buffer_pool_t *p;
747 vlib_physmem_map_t *m = vlib_physmem_get_map (vm, physmem_map_index);
748 uword start = pointer_to_uword (m->base);
749 uword size = (uword) m->n_pages << m->log2_page_size;
751 if (bm->buffer_mem_size == 0)
753 bm->buffer_mem_start = start;
754 bm->buffer_mem_size = size;
756 else if (start < bm->buffer_mem_start)
758 bm->buffer_mem_size += bm->buffer_mem_start - start;
759 bm->buffer_mem_start = start;
760 if (size > bm->buffer_mem_size)
761 bm->buffer_mem_size = size;
763 else if (start > bm->buffer_mem_start)
765 uword new_size = start - bm->buffer_mem_start + size;
766 if (new_size > bm->buffer_mem_size)
767 bm->buffer_mem_size = new_size;
770 if ((u64) bm->buffer_mem_size >
771 ((u64) 1 << (32 + CLIB_LOG2_CACHE_LINE_BYTES)))
773 clib_panic ("buffer memory size out of range!");
776 vec_add2 (bm->buffer_pools, p, 1);
779 p->physmem_map_index = physmem_map_index;
781 ASSERT (p - bm->buffer_pools < 256);
782 return p - bm->buffer_pools;
786 format_vlib_buffer_free_list (u8 * s, va_list * va)
788 vlib_buffer_free_list_t *f = va_arg (*va, vlib_buffer_free_list_t *);
789 u32 threadnum = va_arg (*va, u32);
790 uword bytes_alloc, bytes_free, n_free, size;
793 return format (s, "%=7s%=30s%=12s%=12s%=12s%=12s%=12s%=12s",
794 "Thread", "Name", "Index", "Size", "Alloc", "Free",
797 size = sizeof (vlib_buffer_t) + VLIB_BUFFER_DATA_SIZE;
798 n_free = vec_len (f->buffers);
799 bytes_alloc = size * f->n_alloc;
800 bytes_free = size * n_free;
802 s = format (s, "%7d%30v%12d%12d%=12U%=12U%=12d%=12d", threadnum,
803 f->name, f->index, VLIB_BUFFER_DATA_SIZE,
804 format_memory_size, bytes_alloc,
805 format_memory_size, bytes_free, f->n_alloc, n_free);
810 static clib_error_t *
811 show_buffers (vlib_main_t * vm,
812 unformat_input_t * input, vlib_cli_command_t * cmd)
814 vlib_buffer_free_list_t *f;
815 vlib_main_t *curr_vm;
818 vlib_cli_output (vm, "%U", format_vlib_buffer_free_list, 0, 0);
822 curr_vm = vlib_mains[vm_index];
825 pool_foreach (f, curr_vm->buffer_free_list_pool, ({
826 vlib_cli_output (vm, "%U", format_vlib_buffer_free_list, f, vm_index);
832 while (vm_index < vec_len (vlib_mains));
838 VLIB_CLI_COMMAND (show_buffers_command, static) = {
839 .path = "show buffers",
840 .short_help = "Show packet buffer allocation",
841 .function = show_buffers,
846 vlib_buffer_main_init (struct vlib_main_t * vm)
848 vlib_buffer_main_t *bm;
850 u32 physmem_map_index;
852 int log2_page_size = 0;
854 buffer_log_default = vlib_log_register_class ("buffer", 0);
856 bm = vm->buffer_main = clib_mem_alloc (sizeof (bm[0]));
857 clib_memset (bm, 0, sizeof (bm[0]));
859 if (vlib_buffer_callbacks)
861 /* external plugin has registered own buffer callbacks
862 so we just copy them and quit */
863 clib_memcpy_fast (&bm->cb, vlib_buffer_callbacks,
864 sizeof (vlib_buffer_callbacks_t));
865 bm->callbacks_registered = 1;
869 bm->cb.vlib_buffer_fill_free_list_cb = &vlib_buffer_fill_free_list_internal;
870 bm->cb.vlib_buffer_free_cb = &vlib_buffer_free_internal;
871 bm->cb.vlib_buffer_free_no_next_cb = &vlib_buffer_free_no_next_internal;
872 clib_spinlock_init (&bm->buffer_known_hash_lockp);
875 error = vlib_physmem_shared_map_create (vm, "buffers",
876 vlib_buffer_physmem_sz,
878 CLIB_PMALLOC_NUMA_LOCAL,
881 if (error && log2_page_size == 0)
883 vlib_log_warn (buffer_log_default, "%U", format_clib_error, error);
884 clib_error_free (error);
885 vlib_log_warn (buffer_log_default, "falling back to non-hugepage "
886 "backed buffer pool");
887 log2_page_size = min_log2 (clib_mem_get_page_size ());
894 pool_index = vlib_buffer_register_physmem_map (vm, physmem_map_index);
895 vlib_buffer_pool_t *bp = vlib_buffer_pool_get (vm, pool_index);
896 clib_spinlock_init (&bp->lock);
897 bp->buffer_size = VLIB_BUFFER_DATA_SIZE + sizeof (vlib_buffer_t);
902 static clib_error_t *
903 vlib_buffers_configure (vlib_main_t * vm, unformat_input_t * input)
907 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
909 if (unformat (input, "memory-size-in-mb %d", &size_in_mb))
910 vlib_buffer_physmem_sz = size_in_mb << 20;
912 return unformat_parse_error (input);
915 unformat_free (input);
919 VLIB_EARLY_CONFIG_FUNCTION (vlib_buffers_configure, "buffers");
924 * fd.io coding-style-patch-verification: ON
927 * eval: (c-set-style "gnu")