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 <vppinfra/bitmap.h>
47 #include <vppinfra/unix.h>
48 #include <vlib/vlib.h>
49 #include <vlib/unix/unix.h>
50 #include <vlib/stats/stats.h>
52 #define VLIB_BUFFER_DEFAULT_BUFFERS_PER_NUMA 16384
53 #define VLIB_BUFFER_DEFAULT_BUFFERS_PER_NUMA_UNPRIV 8192
55 #ifdef CLIB_HAVE_VEC128
56 /* Assumptions by vlib_buffer_free_inline: */
57 STATIC_ASSERT_FITS_IN (vlib_buffer_t, flags, 16);
58 STATIC_ASSERT_FITS_IN (vlib_buffer_t, ref_count, 16);
59 STATIC_ASSERT_FITS_IN (vlib_buffer_t, buffer_pool_index, 16);
62 u16 __vlib_buffer_external_hdr_size = 0;
65 vlib_buffer_length_in_chain_slow_path (vlib_main_t * vm,
66 vlib_buffer_t * b_first)
68 vlib_buffer_t *b = b_first;
69 uword l_first = b_first->current_length;
71 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
73 b = vlib_get_buffer (vm, b->next_buffer);
74 l += b->current_length;
76 b_first->total_length_not_including_first_buffer = l;
77 b_first->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
82 format_vlib_buffer_no_chain (u8 * s, va_list * args)
84 vlib_buffer_t *b = va_arg (*args, vlib_buffer_t *);
85 u32 indent = format_get_indent (s);
88 #define _(bit, name, v) \
89 if (v && (b->flags & VLIB_BUFFER_##name)) \
90 a = format (a, "%s ", v);
91 foreach_vlib_buffer_flag
93 s = format (s, "current data %d, length %d, buffer-pool %d, "
94 "ref-count %u", b->current_data, b->current_length,
95 b->buffer_pool_index, b->ref_count);
97 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
98 s = format (s, ", totlen-nifb %d",
99 b->total_length_not_including_first_buffer);
101 if (b->flags & VLIB_BUFFER_IS_TRACED)
102 s = format (s, ", trace handle 0x%x", b->trace_handle);
105 s = format (s, "\n%U%v", format_white_space, indent, a);
112 format_vlib_buffer (u8 * s, va_list * args)
114 vlib_main_t *vm = vlib_get_main ();
115 vlib_buffer_t *b = va_arg (*args, vlib_buffer_t *);
116 u32 indent = format_get_indent (s);
118 s = format (s, "%U", format_vlib_buffer_no_chain, b);
120 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
122 u32 next_buffer = b->next_buffer;
123 b = vlib_get_buffer (vm, next_buffer);
126 format (s, "\n%Unext-buffer 0x%x, segment length %d, ref-count %u",
127 format_white_space, indent, next_buffer, b->current_length,
135 format_vlib_buffer_and_data (u8 * s, va_list * args)
137 vlib_buffer_t *b = va_arg (*args, vlib_buffer_t *);
139 s = format (s, "%U, %U",
140 format_vlib_buffer, b,
141 format_hex_bytes, vlib_buffer_get_current (b), 64);
147 format_vlib_buffer_known_state (u8 * s, va_list * args)
149 vlib_buffer_known_state_t state = va_arg (*args, vlib_buffer_known_state_t);
154 case VLIB_BUFFER_UNKNOWN:
158 case VLIB_BUFFER_KNOWN_ALLOCATED:
159 t = "known-allocated";
162 case VLIB_BUFFER_KNOWN_FREE:
171 return format (s, "%s", t);
175 format_vlib_buffer_contents (u8 * s, va_list * va)
177 vlib_main_t *vm = va_arg (*va, vlib_main_t *);
178 vlib_buffer_t *b = va_arg (*va, vlib_buffer_t *);
182 vec_add (s, vlib_buffer_get_current (b), b->current_length);
183 if (!(b->flags & VLIB_BUFFER_NEXT_PRESENT))
185 b = vlib_get_buffer (vm, b->next_buffer);
192 vlib_validate_buffer_helper (vlib_main_t * vm,
194 uword follow_buffer_next, uword ** unique_hash)
196 vlib_buffer_main_t *bm = vm->buffer_main;
197 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
199 if (vec_len (bm->buffer_pools) <= b->buffer_pool_index)
200 return format (0, "unknown buffer pool 0x%x", b->buffer_pool_index);
202 if ((signed) b->current_data < (signed) -VLIB_BUFFER_PRE_DATA_SIZE)
203 return format (0, "current data %d before pre-data", b->current_data);
205 if (b->current_data + b->current_length >
206 vlib_buffer_get_default_data_size (vm))
207 return format (0, "%d-%d beyond end of buffer %d", b->current_data,
208 b->current_length, vlib_buffer_get_default_data_size (vm));
210 if (follow_buffer_next && (b->flags & VLIB_BUFFER_NEXT_PRESENT))
212 vlib_buffer_known_state_t k;
215 k = vlib_buffer_is_known (vm, b->next_buffer);
216 if (k != VLIB_BUFFER_KNOWN_ALLOCATED)
217 return format (0, "next 0x%x: %U",
218 b->next_buffer, format_vlib_buffer_known_state, k);
222 if (hash_get (*unique_hash, b->next_buffer))
223 return format (0, "duplicate buffer 0x%x", b->next_buffer);
225 hash_set1 (*unique_hash, b->next_buffer);
228 msg = vlib_validate_buffer (vm, b->next_buffer, follow_buffer_next);
231 result = format (0, "next 0x%x: %v", b->next_buffer, msg);
241 vlib_validate_buffer (vlib_main_t * vm, u32 bi, uword follow_buffer_next)
243 return vlib_validate_buffer_helper (vm, bi, follow_buffer_next,
244 /* unique_hash */ 0);
248 vlib_validate_buffers (vlib_main_t * vm,
250 uword next_buffer_stride,
252 vlib_buffer_known_state_t known_state,
253 uword follow_buffer_next)
256 u32 bi, *b = buffers;
257 vlib_buffer_known_state_t k;
258 u8 *msg = 0, *result = 0;
260 hash = hash_create (0, 0);
261 for (i = 0; i < n_buffers; i++)
264 b += next_buffer_stride;
266 /* Buffer is not unique. */
267 if (hash_get (hash, bi))
269 msg = format (0, "not unique");
273 k = vlib_buffer_is_known (vm, bi);
274 if (k != known_state)
276 msg = format (0, "is %U; expected %U",
277 format_vlib_buffer_known_state, k,
278 format_vlib_buffer_known_state, known_state);
282 msg = vlib_validate_buffer_helper (vm, bi, follow_buffer_next, &hash);
286 hash_set1 (hash, bi);
292 result = format (0, "0x%x: %v", bi, msg);
299 /* When debugging validate that given buffers are either known allocated
302 vlib_buffer_validate_alloc_free (vlib_main_t * vm,
305 vlib_buffer_known_state_t expected_state)
307 vlib_buffer_main_t *bm = vm->buffer_main;
309 uword i, bi, is_free;
314 is_free = expected_state == VLIB_BUFFER_KNOWN_ALLOCATED;
316 for (i = 0; i < n_buffers; i++)
318 vlib_buffer_known_state_t known;
322 known = vlib_buffer_is_known (vm, bi);
324 if (known == VLIB_BUFFER_UNKNOWN &&
325 expected_state == VLIB_BUFFER_KNOWN_FREE)
326 known = VLIB_BUFFER_KNOWN_FREE;
328 if (known != expected_state)
330 clib_panic ("%s %U buffer 0x%x", is_free ? "freeing" : "allocating",
331 format_vlib_buffer_known_state, known, bi);
334 clib_spinlock_lock (&bm->buffer_known_hash_lockp);
335 hash_set (bm->buffer_known_hash, bi, is_free ? VLIB_BUFFER_KNOWN_FREE :
336 VLIB_BUFFER_KNOWN_ALLOCATED);
337 clib_spinlock_unlock (&bm->buffer_known_hash_lockp);
342 vlib_packet_template_init (vlib_main_t * vm,
343 vlib_packet_template_t * t,
345 uword n_packet_data_bytes,
346 uword min_n_buffers_each_alloc, char *fmt, ...)
351 t->name = va_format (0, fmt, &va);
354 vlib_worker_thread_barrier_sync (vm);
356 clib_memset (t, 0, sizeof (t[0]));
358 vec_add (t->packet_data, packet_data, n_packet_data_bytes);
359 t->min_n_buffers_each_alloc = min_n_buffers_each_alloc;
360 vlib_worker_thread_barrier_release (vm);
364 vlib_packet_template_get_packet (vlib_main_t * vm,
365 vlib_packet_template_t * t, u32 * bi_result)
370 if (vlib_buffer_alloc (vm, &bi, 1) != 1)
375 b = vlib_get_buffer (vm, bi);
376 clib_memcpy_fast (vlib_buffer_get_current (b),
377 t->packet_data, vec_len (t->packet_data));
378 b->current_length = vec_len (t->packet_data);
383 /* Append given data to end of buffer, possibly allocating new buffers. */
385 vlib_buffer_add_data (vlib_main_t * vm, u32 * buffer_index, void *data,
388 u32 n_buffer_bytes, n_left, n_left_this_buffer, bi;
393 if (bi == ~0 && 1 != vlib_buffer_alloc (vm, &bi, 1))
397 n_left = n_data_bytes;
398 n_buffer_bytes = vlib_buffer_get_default_data_size (vm);
400 b = vlib_get_buffer (vm, bi);
401 b->flags &= ~VLIB_BUFFER_TOTAL_LENGTH_VALID;
403 /* Get to the end of the chain before we try to append data... */
404 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
405 b = vlib_get_buffer (vm, b->next_buffer);
411 ASSERT (n_buffer_bytes >= b->current_length);
413 n_buffer_bytes - (b->current_data + b->current_length);
414 n = clib_min (n_left_this_buffer, n_left);
415 clib_memcpy_fast (vlib_buffer_get_current (b) + b->current_length, d,
417 b->current_length += n;
423 if (1 != vlib_buffer_alloc (vm, &b->next_buffer, 1))
426 b->flags |= VLIB_BUFFER_NEXT_PRESENT;
428 b = vlib_get_buffer (vm, b->next_buffer);
435 clib_warning ("out of buffers");
440 vlib_buffer_chain_append_data_with_alloc (vlib_main_t * vm,
441 vlib_buffer_t * first,
442 vlib_buffer_t ** last, void *data,
445 vlib_buffer_t *l = *last;
446 u32 n_buffer_bytes = vlib_buffer_get_default_data_size (vm);
448 ASSERT (n_buffer_bytes >= l->current_length + l->current_data);
451 u16 max = n_buffer_bytes - l->current_length - l->current_data;
454 if (1 != vlib_buffer_alloc_from_pool (vm, &l->next_buffer, 1,
455 first->buffer_pool_index))
457 *last = l = vlib_buffer_chain_buffer (vm, l, l->next_buffer);
458 max = n_buffer_bytes - l->current_length - l->current_data;
461 u16 len = (data_len > max) ? max : data_len;
462 clib_memcpy_fast (vlib_buffer_get_current (l) + l->current_length,
464 vlib_buffer_chain_increase_length (first, l, len);
472 vlib_buffer_alloc_size (uword ext_hdr_size, uword data_size)
474 uword alloc_size = ext_hdr_size + sizeof (vlib_buffer_t) + data_size;
475 alloc_size = round_pow2 (alloc_size, VLIB_BUFFER_ALIGN);
477 /* in case when we have even number of 'cachelines', we add one more for
478 * better cache occupancy */
479 alloc_size |= VLIB_BUFFER_ALIGN;
485 vlib_buffer_pool_create (vlib_main_t *vm, u32 data_size, u32 physmem_map_index,
488 vlib_buffer_main_t *bm = vm->buffer_main;
489 vlib_buffer_pool_t *bp;
490 vlib_physmem_map_t *m = vlib_physmem_get_map (vm, physmem_map_index);
491 uword start = pointer_to_uword (m->base);
492 uword size = (uword) m->n_pages << m->log2_page_size;
493 uword page_mask = ~pow2_mask (m->log2_page_size);
498 if (vec_len (bm->buffer_pools) >= 255)
501 vec_add2_aligned (bm->buffer_pools, bp, 1, CLIB_CACHE_LINE_BYTES);
503 if (bm->buffer_mem_size == 0)
505 bm->buffer_mem_start = start;
506 bm->buffer_mem_size = size;
508 else if (start < bm->buffer_mem_start)
510 bm->buffer_mem_size += bm->buffer_mem_start - start;
511 bm->buffer_mem_start = start;
512 if (size > bm->buffer_mem_size)
513 bm->buffer_mem_size = size;
515 else if (start > bm->buffer_mem_start)
517 uword new_size = start - bm->buffer_mem_start + size;
518 if (new_size > bm->buffer_mem_size)
519 bm->buffer_mem_size = new_size;
522 if ((u64) bm->buffer_mem_size >
523 ((u64) 1 << (32 + CLIB_LOG2_CACHE_LINE_BYTES)))
525 clib_panic ("buffer memory size out of range!");
530 bp->index = bp - bm->buffer_pools;
531 bp->buffer_template.buffer_pool_index = bp->index;
532 bp->buffer_template.ref_count = 1;
533 bp->physmem_map_index = physmem_map_index;
534 bp->data_size = data_size;
535 bp->numa_node = m->numa_node;
536 bp->log2_page_size = m->log2_page_size;
539 bp->name = va_format (0, fmt, &va);
542 vec_validate_aligned (bp->threads, vlib_get_n_threads () - 1,
543 CLIB_CACHE_LINE_BYTES);
545 alloc_size = vlib_buffer_alloc_size (bm->ext_hdr_size, data_size);
546 bp->alloc_size = alloc_size;
548 /* preallocate buffer indices memory */
549 bp->buffers = clib_mem_alloc_aligned (
550 round_pow2 ((size / alloc_size) * sizeof (u32), CLIB_CACHE_LINE_BYTES),
551 CLIB_CACHE_LINE_BYTES);
553 clib_spinlock_init (&bp->lock);
557 /* start with naturally aligned address */
558 p += alloc_size - (uword) p % alloc_size;
561 * Waste 1 buffer (maximum) so that 0 is never a valid buffer index.
562 * Allows various places to ASSERT (bi != 0). Much easier
563 * than debugging downstream crashes in successor nodes.
568 for (; p < (u8 *) m->base + size - alloc_size; p += alloc_size)
573 /* skip if buffer spans across page boundary */
574 if (((uword) p & page_mask) != ((uword) (p + alloc_size) & page_mask))
577 b = (vlib_buffer_t *) (p + bm->ext_hdr_size);
578 b->template = bp->buffer_template;
579 bi = vlib_get_buffer_index (vm, b);
580 bp->buffers[bp->n_avail++] = bi;
581 vlib_get_buffer (vm, bi);
584 bp->n_buffers = bp->n_avail;
590 format_vlib_buffer_pool (u8 * s, va_list * va)
592 vlib_main_t *vm = va_arg (*va, vlib_main_t *);
593 vlib_buffer_pool_t *bp = va_arg (*va, vlib_buffer_pool_t *);
594 vlib_buffer_pool_thread_t *bpt;
598 return format (s, "%-20s%=6s%=6s%=6s%=11s%=6s%=8s%=8s%=8s",
599 "Pool Name", "Index", "NUMA", "Size", "Data Size",
600 "Total", "Avail", "Cached", "Used");
602 vec_foreach (bpt, bp->threads)
603 cached += bpt->n_cached;
605 s = format (s, "%-20v%=6d%=6d%=6u%=11u%=6u%=8u%=8u%=8u", bp->name, bp->index,
607 bp->data_size + sizeof (vlib_buffer_t) +
608 vm->buffer_main->ext_hdr_size,
609 bp->data_size, bp->n_buffers, bp->n_avail, cached,
610 bp->n_buffers - bp->n_avail - cached);
616 format_vlib_buffer_pool_all (u8 *s, va_list *va)
618 vlib_main_t *vm = va_arg (*va, vlib_main_t *);
619 vlib_buffer_main_t *bm = vm->buffer_main;
620 vlib_buffer_pool_t *bp;
622 s = format (s, "%U", format_vlib_buffer_pool, vm, 0);
624 vec_foreach (bp, bm->buffer_pools)
625 s = format (s, "\n%U", format_vlib_buffer_pool, vm, bp);
630 static clib_error_t *
631 show_buffers (vlib_main_t *vm, unformat_input_t *input,
632 vlib_cli_command_t *cmd)
634 vlib_cli_output (vm, "%U", format_vlib_buffer_pool_all, vm);
638 VLIB_CLI_COMMAND (show_buffers_command, static) = {
639 .path = "show buffers",
640 .short_help = "Show packet buffer allocation",
641 .function = show_buffers,
645 vlib_buffer_num_workers_change (vlib_main_t *vm)
647 vlib_buffer_main_t *bm = vm->buffer_main;
648 vlib_buffer_pool_t *bp;
650 vec_foreach (bp, bm->buffer_pools)
651 vec_validate_aligned (bp->threads, vlib_get_n_threads () - 1,
652 CLIB_CACHE_LINE_BYTES);
657 VLIB_NUM_WORKERS_CHANGE_FN (vlib_buffer_num_workers_change);
659 static clib_error_t *
660 vlib_buffer_main_init_numa_alloc (struct vlib_main_t *vm, u32 numa_node,
661 u32 * physmem_map_index,
662 clib_mem_page_sz_t log2_page_size,
665 vlib_buffer_main_t *bm = vm->buffer_main;
666 u32 buffers_per_numa = bm->buffers_per_numa;
669 uword n_pages, pagesize;
672 ASSERT (log2_page_size != CLIB_MEM_PAGE_SZ_UNKNOWN);
674 pagesize = clib_mem_page_bytes (log2_page_size);
675 buffer_size = vlib_buffer_alloc_size (bm->ext_hdr_size,
676 vlib_buffer_get_default_data_size
678 if (buffer_size > pagesize)
679 return clib_error_return (0, "buffer size (%llu) is greater than page "
680 "size (%llu)", buffer_size, pagesize);
682 if (buffers_per_numa == 0)
683 buffers_per_numa = unpriv ? VLIB_BUFFER_DEFAULT_BUFFERS_PER_NUMA_UNPRIV :
684 VLIB_BUFFER_DEFAULT_BUFFERS_PER_NUMA;
686 name = format (0, "buffers-numa-%d%c", numa_node, 0);
687 n_pages = (buffers_per_numa - 1) / (pagesize / buffer_size) + 1;
688 error = vlib_physmem_shared_map_create (vm, (char *) name,
690 min_log2 (pagesize), numa_node,
696 static clib_error_t *
697 vlib_buffer_main_init_numa_node (struct vlib_main_t *vm, u32 numa_node,
700 vlib_buffer_main_t *bm = vm->buffer_main;
701 u32 physmem_map_index;
704 if (bm->log2_page_size == CLIB_MEM_PAGE_SZ_UNKNOWN)
706 error = vlib_buffer_main_init_numa_alloc (vm, numa_node,
708 CLIB_MEM_PAGE_SZ_DEFAULT_HUGE,
711 goto buffer_pool_create;
713 /* If alloc failed, retry without hugepages */
714 vlib_log_warn (bm->log_default,
715 "numa[%u] falling back to non-hugepage backed "
716 "buffer pool (%U)", numa_node, format_clib_error, error);
717 clib_error_free (error);
719 error = vlib_buffer_main_init_numa_alloc (vm, numa_node,
721 CLIB_MEM_PAGE_SZ_DEFAULT,
725 error = vlib_buffer_main_init_numa_alloc (vm, numa_node,
734 vlib_buffer_pool_create (vm, vlib_buffer_get_default_data_size (vm),
735 physmem_map_index, "default-numa-%d", numa_node);
737 if (*index == (u8) ~ 0)
738 error = clib_error_return (0, "maximum number of buffer pools reached");
745 vlib_buffer_main_alloc (vlib_main_t * vm)
747 vlib_buffer_main_t *bm;
752 vm->buffer_main = bm = clib_mem_alloc (sizeof (bm[0]));
753 clib_memset (vm->buffer_main, 0, sizeof (bm[0]));
754 bm->default_data_size = VLIB_BUFFER_DEFAULT_DATA_SIZE;
758 buffer_get_cached (vlib_buffer_pool_t * bp)
761 vlib_buffer_pool_thread_t *bpt;
763 clib_spinlock_lock (&bp->lock);
765 vec_foreach (bpt, bp->threads)
766 cached += bpt->n_cached;
768 clib_spinlock_unlock (&bp->lock);
773 static vlib_buffer_pool_t *
774 buffer_get_by_index (vlib_buffer_main_t * bm, u32 index)
776 vlib_buffer_pool_t *bp;
777 if (!bm->buffer_pools || vec_len (bm->buffer_pools) < index)
779 bp = vec_elt_at_index (bm->buffer_pools, index);
785 buffer_gauges_collect_used_fn (vlib_stats_collector_data_t *d)
787 vlib_main_t *vm = vlib_get_main ();
788 vlib_buffer_pool_t *bp =
789 buffer_get_by_index (vm->buffer_main, d->private_data);
793 d->entry->value = bp->n_buffers - bp->n_avail - buffer_get_cached (bp);
797 buffer_gauges_collect_available_fn (vlib_stats_collector_data_t *d)
799 vlib_main_t *vm = vlib_get_main ();
800 vlib_buffer_pool_t *bp =
801 buffer_get_by_index (vm->buffer_main, d->private_data);
805 d->entry->value = bp->n_avail;
809 buffer_gauges_collect_cached_fn (vlib_stats_collector_data_t *d)
811 vlib_main_t *vm = vlib_get_main ();
812 vlib_buffer_pool_t *bp =
813 buffer_get_by_index (vm->buffer_main, d->private_data);
817 d->entry->value = buffer_get_cached (bp);
821 vlib_buffer_main_init (struct vlib_main_t * vm)
823 vlib_buffer_main_t *bm;
825 clib_bitmap_t *bmp = 0, *bmp_has_memory = 0;
827 vlib_buffer_pool_t *bp;
828 u8 *name = 0, first_valid_buffer_pool_index = ~0;
830 vlib_buffer_main_alloc (vm);
832 bm = vm->buffer_main;
833 bm->log_default = vlib_log_register_class ("buffer", 0);
834 bm->ext_hdr_size = __vlib_buffer_external_hdr_size;
836 clib_spinlock_init (&bm->buffer_known_hash_lockp);
838 bmp = os_get_online_cpu_node_bitmap ();
839 bmp_has_memory = os_get_cpu_with_memory_bitmap ();
841 if (bmp && bmp_has_memory)
842 bmp = clib_bitmap_and (bmp, bmp_has_memory);
844 /* no info from sysfs, assuming that only numa 0 exists */
846 bmp = clib_bitmap_set (bmp, 0, 1);
848 if (clib_bitmap_last_set (bmp) >= VLIB_BUFFER_MAX_NUMA_NODES)
849 clib_panic ("system have more than %u NUMA nodes",
850 VLIB_BUFFER_MAX_NUMA_NODES);
852 clib_bitmap_foreach (numa_node, bmp)
854 u8 *index = bm->default_buffer_pool_index_for_numa + numa_node;
856 if ((err = vlib_buffer_main_init_numa_node (vm, numa_node, index)))
858 clib_error_report (err);
859 clib_error_free (err);
863 if (first_valid_buffer_pool_index == 0xff)
864 first_valid_buffer_pool_index = index[0];
867 if (first_valid_buffer_pool_index == (u8) ~ 0)
869 err = clib_error_return (0, "failed to allocate buffer pool(s)");
873 clib_bitmap_foreach (numa_node, bmp)
875 if (bm->default_buffer_pool_index_for_numa[numa_node] == (u8) ~0)
876 bm->default_buffer_pool_index_for_numa[numa_node] =
877 first_valid_buffer_pool_index;
880 vec_foreach (bp, bm->buffer_pools)
882 vlib_stats_collector_reg_t reg = { .private_data = bp - bm->buffer_pools };
883 if (bp->n_buffers == 0)
887 vlib_stats_add_gauge ("/buffer-pools/%v/cached", bp->name);
888 reg.collect_fn = buffer_gauges_collect_cached_fn;
889 vlib_stats_register_collector_fn (®);
891 reg.entry_index = vlib_stats_add_gauge ("/buffer-pools/%v/used", bp->name);
892 reg.collect_fn = buffer_gauges_collect_used_fn;
893 vlib_stats_register_collector_fn (®);
896 vlib_stats_add_gauge ("/buffer-pools/%v/available", bp->name);
897 reg.collect_fn = buffer_gauges_collect_available_fn;
898 vlib_stats_register_collector_fn (®);
903 vec_free (bmp_has_memory);
908 static clib_error_t *
909 vlib_buffers_configure (vlib_main_t * vm, unformat_input_t * input)
911 vlib_buffer_main_t *bm;
913 vlib_buffer_main_alloc (vm);
915 bm = vm->buffer_main;
916 bm->log2_page_size = CLIB_MEM_PAGE_SZ_UNKNOWN;
918 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
920 if (unformat (input, "buffers-per-numa %u", &bm->buffers_per_numa))
922 else if (unformat (input, "page-size %U", unformat_log2_page_size,
923 &bm->log2_page_size))
925 else if (unformat (input, "default data-size %u",
926 &bm->default_data_size))
929 return unformat_parse_error (input);
932 unformat_free (input);
936 VLIB_EARLY_CONFIG_FUNCTION (vlib_buffers_configure, "buffers");
938 #if VLIB_BUFFER_ALLOC_FAULT_INJECTOR > 0
940 vlib_buffer_alloc_may_fail (vlib_main_t * vm, u32 n_buffers)
944 r = random_f64 (&vm->buffer_alloc_success_seed);
946 /* Fail this request? */
947 if (r > vm->buffer_alloc_success_rate)
949 /* 5% chance of returning nothing at all */
950 if (r > vm->buffer_alloc_success_rate && r > 0.95)
958 vlib_buffer_set_alloc_free_callback (
959 vlib_main_t *vm, vlib_buffer_alloc_free_callback_t *alloc_callback_fn,
960 vlib_buffer_alloc_free_callback_t *free_callback_fn)
962 vlib_buffer_main_t *bm = vm->buffer_main;
963 if ((alloc_callback_fn && bm->alloc_callback_fn) ||
964 (free_callback_fn && bm->free_callback_fn))
966 bm->alloc_callback_fn = alloc_callback_fn;
967 bm->free_callback_fn = free_callback_fn;
973 * fd.io coding-style-patch-verification: ON
976 * eval: (c-set-style "gnu")