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/linux/sysfs.h>
47 #include <vlib/vlib.h>
48 #include <vlib/unix/unix.h>
49 #include <vlib/stats/stats.h>
51 #define VLIB_BUFFER_DEFAULT_BUFFERS_PER_NUMA 16384
52 #define VLIB_BUFFER_DEFAULT_BUFFERS_PER_NUMA_UNPRIV 8192
54 #ifdef CLIB_HAVE_VEC128
55 /* Assumptions by vlib_buffer_free_inline: */
56 STATIC_ASSERT_FITS_IN (vlib_buffer_t, flags, 16);
57 STATIC_ASSERT_FITS_IN (vlib_buffer_t, ref_count, 16);
58 STATIC_ASSERT_FITS_IN (vlib_buffer_t, buffer_pool_index, 16);
61 u16 __vlib_buffer_external_hdr_size = 0;
64 vlib_buffer_length_in_chain_slow_path (vlib_main_t * vm,
65 vlib_buffer_t * b_first)
67 vlib_buffer_t *b = b_first;
68 uword l_first = b_first->current_length;
70 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
72 b = vlib_get_buffer (vm, b->next_buffer);
73 l += b->current_length;
75 b_first->total_length_not_including_first_buffer = l;
76 b_first->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
81 format_vlib_buffer_no_chain (u8 * s, va_list * args)
83 vlib_buffer_t *b = va_arg (*args, vlib_buffer_t *);
84 u32 indent = format_get_indent (s);
87 #define _(bit, name, v) \
88 if (v && (b->flags & VLIB_BUFFER_##name)) \
89 a = format (a, "%s ", v);
90 foreach_vlib_buffer_flag
92 s = format (s, "current data %d, length %d, buffer-pool %d, "
93 "ref-count %u", b->current_data, b->current_length,
94 b->buffer_pool_index, b->ref_count);
96 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
97 s = format (s, ", totlen-nifb %d",
98 b->total_length_not_including_first_buffer);
100 if (b->flags & VLIB_BUFFER_IS_TRACED)
101 s = format (s, ", trace handle 0x%x", b->trace_handle);
104 s = format (s, "\n%U%v", format_white_space, indent, a);
111 format_vlib_buffer (u8 * s, va_list * args)
113 vlib_main_t *vm = vlib_get_main ();
114 vlib_buffer_t *b = va_arg (*args, vlib_buffer_t *);
115 u32 indent = format_get_indent (s);
117 s = format (s, "%U", format_vlib_buffer_no_chain, b);
119 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
121 u32 next_buffer = b->next_buffer;
122 b = vlib_get_buffer (vm, next_buffer);
125 format (s, "\n%Unext-buffer 0x%x, segment length %d, ref-count %u",
126 format_white_space, indent, next_buffer, b->current_length,
134 format_vlib_buffer_and_data (u8 * s, va_list * args)
136 vlib_buffer_t *b = va_arg (*args, vlib_buffer_t *);
138 s = format (s, "%U, %U",
139 format_vlib_buffer, b,
140 format_hex_bytes, vlib_buffer_get_current (b), 64);
146 format_vlib_buffer_known_state (u8 * s, va_list * args)
148 vlib_buffer_known_state_t state = va_arg (*args, vlib_buffer_known_state_t);
153 case VLIB_BUFFER_UNKNOWN:
157 case VLIB_BUFFER_KNOWN_ALLOCATED:
158 t = "known-allocated";
161 case VLIB_BUFFER_KNOWN_FREE:
170 return format (s, "%s", t);
174 format_vlib_buffer_contents (u8 * s, va_list * va)
176 vlib_main_t *vm = va_arg (*va, vlib_main_t *);
177 vlib_buffer_t *b = va_arg (*va, vlib_buffer_t *);
181 vec_add (s, vlib_buffer_get_current (b), b->current_length);
182 if (!(b->flags & VLIB_BUFFER_NEXT_PRESENT))
184 b = vlib_get_buffer (vm, b->next_buffer);
191 vlib_validate_buffer_helper (vlib_main_t * vm,
193 uword follow_buffer_next, uword ** unique_hash)
195 vlib_buffer_main_t *bm = vm->buffer_main;
196 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
198 if (vec_len (bm->buffer_pools) <= b->buffer_pool_index)
199 return format (0, "unknown buffer pool 0x%x", b->buffer_pool_index);
201 if ((signed) b->current_data < (signed) -VLIB_BUFFER_PRE_DATA_SIZE)
202 return format (0, "current data %d before pre-data", b->current_data);
204 if (b->current_data + b->current_length >
205 vlib_buffer_get_default_data_size (vm))
206 return format (0, "%d-%d beyond end of buffer %d", b->current_data,
207 b->current_length, vlib_buffer_get_default_data_size (vm));
209 if (follow_buffer_next && (b->flags & VLIB_BUFFER_NEXT_PRESENT))
211 vlib_buffer_known_state_t k;
214 k = vlib_buffer_is_known (vm, b->next_buffer);
215 if (k != VLIB_BUFFER_KNOWN_ALLOCATED)
216 return format (0, "next 0x%x: %U",
217 b->next_buffer, format_vlib_buffer_known_state, k);
221 if (hash_get (*unique_hash, b->next_buffer))
222 return format (0, "duplicate buffer 0x%x", b->next_buffer);
224 hash_set1 (*unique_hash, b->next_buffer);
227 msg = vlib_validate_buffer (vm, b->next_buffer, follow_buffer_next);
230 result = format (0, "next 0x%x: %v", b->next_buffer, msg);
240 vlib_validate_buffer (vlib_main_t * vm, u32 bi, uword follow_buffer_next)
242 return vlib_validate_buffer_helper (vm, bi, follow_buffer_next,
243 /* unique_hash */ 0);
247 vlib_validate_buffers (vlib_main_t * vm,
249 uword next_buffer_stride,
251 vlib_buffer_known_state_t known_state,
252 uword follow_buffer_next)
255 u32 bi, *b = buffers;
256 vlib_buffer_known_state_t k;
257 u8 *msg = 0, *result = 0;
259 hash = hash_create (0, 0);
260 for (i = 0; i < n_buffers; i++)
263 b += next_buffer_stride;
265 /* Buffer is not unique. */
266 if (hash_get (hash, bi))
268 msg = format (0, "not unique");
272 k = vlib_buffer_is_known (vm, bi);
273 if (k != known_state)
275 msg = format (0, "is %U; expected %U",
276 format_vlib_buffer_known_state, k,
277 format_vlib_buffer_known_state, known_state);
281 msg = vlib_validate_buffer_helper (vm, bi, follow_buffer_next, &hash);
285 hash_set1 (hash, bi);
291 result = format (0, "0x%x: %v", bi, msg);
298 /* When debugging validate that given buffers are either known allocated
301 vlib_buffer_validate_alloc_free (vlib_main_t * vm,
304 vlib_buffer_known_state_t expected_state)
306 vlib_buffer_main_t *bm = vm->buffer_main;
308 uword i, bi, is_free;
313 is_free = expected_state == VLIB_BUFFER_KNOWN_ALLOCATED;
315 for (i = 0; i < n_buffers; i++)
317 vlib_buffer_known_state_t known;
321 known = vlib_buffer_is_known (vm, bi);
323 if (known == VLIB_BUFFER_UNKNOWN &&
324 expected_state == VLIB_BUFFER_KNOWN_FREE)
325 known = VLIB_BUFFER_KNOWN_FREE;
327 if (known != expected_state)
329 clib_panic ("%s %U buffer 0x%x", is_free ? "freeing" : "allocating",
330 format_vlib_buffer_known_state, known, bi);
333 clib_spinlock_lock (&bm->buffer_known_hash_lockp);
334 hash_set (bm->buffer_known_hash, bi, is_free ? VLIB_BUFFER_KNOWN_FREE :
335 VLIB_BUFFER_KNOWN_ALLOCATED);
336 clib_spinlock_unlock (&bm->buffer_known_hash_lockp);
341 vlib_packet_template_init (vlib_main_t * vm,
342 vlib_packet_template_t * t,
344 uword n_packet_data_bytes,
345 uword min_n_buffers_each_alloc, char *fmt, ...)
350 t->name = va_format (0, fmt, &va);
353 vlib_worker_thread_barrier_sync (vm);
355 clib_memset (t, 0, sizeof (t[0]));
357 vec_add (t->packet_data, packet_data, n_packet_data_bytes);
358 t->min_n_buffers_each_alloc = min_n_buffers_each_alloc;
359 vlib_worker_thread_barrier_release (vm);
363 vlib_packet_template_get_packet (vlib_main_t * vm,
364 vlib_packet_template_t * t, u32 * bi_result)
369 if (vlib_buffer_alloc (vm, &bi, 1) != 1)
374 b = vlib_get_buffer (vm, bi);
375 clib_memcpy_fast (vlib_buffer_get_current (b),
376 t->packet_data, vec_len (t->packet_data));
377 b->current_length = vec_len (t->packet_data);
382 /* Append given data to end of buffer, possibly allocating new buffers. */
384 vlib_buffer_add_data (vlib_main_t * vm, u32 * buffer_index, void *data,
387 u32 n_buffer_bytes, n_left, n_left_this_buffer, bi;
392 if (bi == ~0 && 1 != vlib_buffer_alloc (vm, &bi, 1))
396 n_left = n_data_bytes;
397 n_buffer_bytes = vlib_buffer_get_default_data_size (vm);
399 b = vlib_get_buffer (vm, bi);
400 b->flags &= ~VLIB_BUFFER_TOTAL_LENGTH_VALID;
402 /* Get to the end of the chain before we try to append data... */
403 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
404 b = vlib_get_buffer (vm, b->next_buffer);
410 ASSERT (n_buffer_bytes >= b->current_length);
412 n_buffer_bytes - (b->current_data + b->current_length);
413 n = clib_min (n_left_this_buffer, n_left);
414 clib_memcpy_fast (vlib_buffer_get_current (b) + b->current_length, d,
416 b->current_length += n;
422 if (1 != vlib_buffer_alloc (vm, &b->next_buffer, 1))
425 b->flags |= VLIB_BUFFER_NEXT_PRESENT;
427 b = vlib_get_buffer (vm, b->next_buffer);
434 clib_warning ("out of buffers");
439 vlib_buffer_chain_append_data_with_alloc (vlib_main_t * vm,
440 vlib_buffer_t * first,
441 vlib_buffer_t ** last, void *data,
444 vlib_buffer_t *l = *last;
445 u32 n_buffer_bytes = vlib_buffer_get_default_data_size (vm);
447 ASSERT (n_buffer_bytes >= l->current_length + l->current_data);
450 u16 max = n_buffer_bytes - l->current_length - l->current_data;
453 if (1 != vlib_buffer_alloc_from_pool (vm, &l->next_buffer, 1,
454 first->buffer_pool_index))
456 *last = l = vlib_buffer_chain_buffer (vm, l, l->next_buffer);
457 max = n_buffer_bytes - l->current_length - l->current_data;
460 u16 len = (data_len > max) ? max : data_len;
461 clib_memcpy_fast (vlib_buffer_get_current (l) + l->current_length,
463 vlib_buffer_chain_increase_length (first, l, len);
471 vlib_buffer_alloc_size (uword ext_hdr_size, uword data_size)
473 uword alloc_size = ext_hdr_size + sizeof (vlib_buffer_t) + data_size;
474 alloc_size = round_pow2 (alloc_size, VLIB_BUFFER_ALIGN);
480 vlib_buffer_pool_create (vlib_main_t *vm, u32 data_size, u32 physmem_map_index,
483 vlib_buffer_main_t *bm = vm->buffer_main;
484 vlib_buffer_pool_t *bp;
485 vlib_physmem_map_t *m = vlib_physmem_get_map (vm, physmem_map_index);
486 uword start = pointer_to_uword (m->base);
487 uword size = (uword) m->n_pages << m->log2_page_size;
488 uword page_mask = ~pow2_mask (m->log2_page_size);
493 if (vec_len (bm->buffer_pools) >= 255)
496 vec_add2_aligned (bm->buffer_pools, bp, 1, CLIB_CACHE_LINE_BYTES);
498 if (bm->buffer_mem_size == 0)
500 bm->buffer_mem_start = start;
501 bm->buffer_mem_size = size;
503 else if (start < bm->buffer_mem_start)
505 bm->buffer_mem_size += bm->buffer_mem_start - start;
506 bm->buffer_mem_start = start;
507 if (size > bm->buffer_mem_size)
508 bm->buffer_mem_size = size;
510 else if (start > bm->buffer_mem_start)
512 uword new_size = start - bm->buffer_mem_start + size;
513 if (new_size > bm->buffer_mem_size)
514 bm->buffer_mem_size = new_size;
517 if ((u64) bm->buffer_mem_size >
518 ((u64) 1 << (32 + CLIB_LOG2_CACHE_LINE_BYTES)))
520 clib_panic ("buffer memory size out of range!");
525 bp->index = bp - bm->buffer_pools;
526 bp->buffer_template.buffer_pool_index = bp->index;
527 bp->buffer_template.ref_count = 1;
528 bp->physmem_map_index = physmem_map_index;
529 bp->data_size = data_size;
530 bp->numa_node = m->numa_node;
531 bp->log2_page_size = m->log2_page_size;
534 bp->name = va_format (0, fmt, &va);
537 vec_validate_aligned (bp->threads, vlib_get_n_threads () - 1,
538 CLIB_CACHE_LINE_BYTES);
540 alloc_size = vlib_buffer_alloc_size (bm->ext_hdr_size, data_size);
541 bp->alloc_size = alloc_size;
543 /* preallocate buffer indices memory */
544 bp->buffers = clib_mem_alloc_aligned (
545 round_pow2 ((size / alloc_size) * sizeof (u32), CLIB_CACHE_LINE_BYTES),
546 CLIB_CACHE_LINE_BYTES);
548 clib_spinlock_init (&bp->lock);
552 /* start with naturally aligned address */
553 p += alloc_size - (uword) p % alloc_size;
556 * Waste 1 buffer (maximum) so that 0 is never a valid buffer index.
557 * Allows various places to ASSERT (bi != 0). Much easier
558 * than debugging downstream crashes in successor nodes.
563 for (; p < (u8 *) m->base + size - alloc_size; p += alloc_size)
568 /* skip if buffer spans across page boundary */
569 if (((uword) p & page_mask) != ((uword) (p + alloc_size) & page_mask))
572 b = (vlib_buffer_t *) (p + bm->ext_hdr_size);
573 b->template = bp->buffer_template;
574 bi = vlib_get_buffer_index (vm, b);
575 bp->buffers[bp->n_avail++] = bi;
576 vlib_get_buffer (vm, bi);
579 bp->n_buffers = bp->n_avail;
585 format_vlib_buffer_pool (u8 * s, va_list * va)
587 vlib_main_t *vm = va_arg (*va, vlib_main_t *);
588 vlib_buffer_pool_t *bp = va_arg (*va, vlib_buffer_pool_t *);
589 vlib_buffer_pool_thread_t *bpt;
593 return format (s, "%-20s%=6s%=6s%=6s%=11s%=6s%=8s%=8s%=8s",
594 "Pool Name", "Index", "NUMA", "Size", "Data Size",
595 "Total", "Avail", "Cached", "Used");
598 vec_foreach (bpt, bp->threads)
599 cached += bpt->n_cached;
602 s = format (s, "%-20v%=6d%=6d%=6u%=11u%=6u%=8u%=8u%=8u", bp->name, bp->index,
604 bp->data_size + sizeof (vlib_buffer_t) +
605 vm->buffer_main->ext_hdr_size,
606 bp->data_size, bp->n_buffers, bp->n_avail, cached,
607 bp->n_buffers - bp->n_avail - cached);
613 format_vlib_buffer_pool_all (u8 *s, va_list *va)
615 vlib_main_t *vm = va_arg (*va, vlib_main_t *);
616 vlib_buffer_main_t *bm = vm->buffer_main;
617 vlib_buffer_pool_t *bp;
619 s = format (s, "%U", format_vlib_buffer_pool, vm, 0);
621 vec_foreach (bp, bm->buffer_pools)
622 s = format (s, "\n%U", format_vlib_buffer_pool, vm, bp);
627 static clib_error_t *
628 show_buffers (vlib_main_t *vm, unformat_input_t *input,
629 vlib_cli_command_t *cmd)
631 vlib_cli_output (vm, "%U", format_vlib_buffer_pool_all, vm);
636 VLIB_CLI_COMMAND (show_buffers_command, static) = {
637 .path = "show buffers",
638 .short_help = "Show packet buffer allocation",
639 .function = show_buffers,
644 vlib_buffer_num_workers_change (vlib_main_t *vm)
646 vlib_buffer_main_t *bm = vm->buffer_main;
647 vlib_buffer_pool_t *bp;
649 vec_foreach (bp, bm->buffer_pools)
650 vec_validate_aligned (bp->threads, vlib_get_n_threads () - 1,
651 CLIB_CACHE_LINE_BYTES);
656 VLIB_NUM_WORKERS_CHANGE_FN (vlib_buffer_num_workers_change);
658 static clib_error_t *
659 vlib_buffer_main_init_numa_alloc (struct vlib_main_t *vm, u32 numa_node,
660 u32 * physmem_map_index,
661 clib_mem_page_sz_t log2_page_size,
664 vlib_buffer_main_t *bm = vm->buffer_main;
665 u32 buffers_per_numa = bm->buffers_per_numa;
668 uword n_pages, pagesize;
671 ASSERT (log2_page_size != CLIB_MEM_PAGE_SZ_UNKNOWN);
673 pagesize = clib_mem_page_bytes (log2_page_size);
674 buffer_size = vlib_buffer_alloc_size (bm->ext_hdr_size,
675 vlib_buffer_get_default_data_size
677 if (buffer_size > pagesize)
678 return clib_error_return (0, "buffer size (%llu) is greater than page "
679 "size (%llu)", buffer_size, pagesize);
681 if (buffers_per_numa == 0)
682 buffers_per_numa = unpriv ? VLIB_BUFFER_DEFAULT_BUFFERS_PER_NUMA_UNPRIV :
683 VLIB_BUFFER_DEFAULT_BUFFERS_PER_NUMA;
685 name = format (0, "buffers-numa-%d%c", numa_node, 0);
686 n_pages = (buffers_per_numa - 1) / (pagesize / buffer_size) + 1;
687 error = vlib_physmem_shared_map_create (vm, (char *) name,
689 min_log2 (pagesize), numa_node,
695 static clib_error_t *
696 vlib_buffer_main_init_numa_node (struct vlib_main_t *vm, u32 numa_node,
699 vlib_buffer_main_t *bm = vm->buffer_main;
700 u32 physmem_map_index;
703 if (bm->log2_page_size == CLIB_MEM_PAGE_SZ_UNKNOWN)
705 error = vlib_buffer_main_init_numa_alloc (vm, numa_node,
707 CLIB_MEM_PAGE_SZ_DEFAULT_HUGE,
710 goto buffer_pool_create;
712 /* If alloc failed, retry without hugepages */
713 vlib_log_warn (bm->log_default,
714 "numa[%u] falling back to non-hugepage backed "
715 "buffer pool (%U)", numa_node, format_clib_error, error);
716 clib_error_free (error);
718 error = vlib_buffer_main_init_numa_alloc (vm, numa_node,
720 CLIB_MEM_PAGE_SZ_DEFAULT,
724 error = vlib_buffer_main_init_numa_alloc (vm, numa_node,
733 vlib_buffer_pool_create (vm, vlib_buffer_get_default_data_size (vm),
734 physmem_map_index, "default-numa-%d", numa_node);
736 if (*index == (u8) ~ 0)
737 error = clib_error_return (0, "maximum number of buffer pools reached");
744 vlib_buffer_main_alloc (vlib_main_t * vm)
746 vlib_buffer_main_t *bm;
751 vm->buffer_main = bm = clib_mem_alloc (sizeof (bm[0]));
752 clib_memset (vm->buffer_main, 0, sizeof (bm[0]));
753 bm->default_data_size = VLIB_BUFFER_DEFAULT_DATA_SIZE;
757 buffer_get_cached (vlib_buffer_pool_t * bp)
760 vlib_buffer_pool_thread_t *bpt;
762 clib_spinlock_lock (&bp->lock);
765 vec_foreach (bpt, bp->threads)
766 cached += bpt->n_cached;
769 clib_spinlock_unlock (&bp->lock);
774 static vlib_buffer_pool_t *
775 buffer_get_by_index (vlib_buffer_main_t * bm, u32 index)
777 vlib_buffer_pool_t *bp;
778 if (!bm->buffer_pools || vec_len (bm->buffer_pools) < index)
780 bp = vec_elt_at_index (bm->buffer_pools, index);
786 buffer_gauges_collect_used_fn (vlib_stats_collector_data_t *d)
788 vlib_main_t *vm = vlib_get_main ();
789 vlib_buffer_pool_t *bp =
790 buffer_get_by_index (vm->buffer_main, d->private_data);
794 d->entry->value = bp->n_buffers - bp->n_avail - buffer_get_cached (bp);
798 buffer_gauges_collect_available_fn (vlib_stats_collector_data_t *d)
800 vlib_main_t *vm = vlib_get_main ();
801 vlib_buffer_pool_t *bp =
802 buffer_get_by_index (vm->buffer_main, d->private_data);
806 d->entry->value = bp->n_avail;
810 buffer_gauges_collect_cached_fn (vlib_stats_collector_data_t *d)
812 vlib_main_t *vm = vlib_get_main ();
813 vlib_buffer_pool_t *bp =
814 buffer_get_by_index (vm->buffer_main, d->private_data);
818 d->entry->value = buffer_get_cached (bp);
822 vlib_buffer_main_init (struct vlib_main_t * vm)
824 vlib_buffer_main_t *bm;
826 clib_bitmap_t *bmp = 0, *bmp_has_memory = 0;
828 vlib_buffer_pool_t *bp;
829 u8 *name = 0, first_valid_buffer_pool_index = ~0;
831 vlib_buffer_main_alloc (vm);
833 bm = vm->buffer_main;
834 bm->log_default = vlib_log_register_class ("buffer", 0);
835 bm->ext_hdr_size = __vlib_buffer_external_hdr_size;
837 clib_spinlock_init (&bm->buffer_known_hash_lockp);
839 if ((err = clib_sysfs_read ("/sys/devices/system/node/online", "%U",
840 unformat_bitmap_list, &bmp)))
841 clib_error_free (err);
843 if ((err = clib_sysfs_read ("/sys/devices/system/node/has_memory", "%U",
844 unformat_bitmap_list, &bmp_has_memory)))
845 clib_error_free (err);
847 if (bmp && bmp_has_memory)
848 bmp = clib_bitmap_and (bmp, bmp_has_memory);
850 /* no info from sysfs, assuming that only numa 0 exists */
852 bmp = clib_bitmap_set (bmp, 0, 1);
854 if (clib_bitmap_last_set (bmp) >= VLIB_BUFFER_MAX_NUMA_NODES)
855 clib_panic ("system have more than %u NUMA nodes",
856 VLIB_BUFFER_MAX_NUMA_NODES);
859 clib_bitmap_foreach (numa_node, bmp)
861 u8 *index = bm->default_buffer_pool_index_for_numa + numa_node;
863 if ((err = vlib_buffer_main_init_numa_node (vm, numa_node, index)))
865 clib_error_report (err);
866 clib_error_free (err);
870 if (first_valid_buffer_pool_index == 0xff)
871 first_valid_buffer_pool_index = index[0];
875 if (first_valid_buffer_pool_index == (u8) ~ 0)
877 err = clib_error_return (0, "failed to allocate buffer pool(s)");
882 clib_bitmap_foreach (numa_node, bmp)
884 if (bm->default_buffer_pool_index_for_numa[numa_node] == (u8) ~0)
885 bm->default_buffer_pool_index_for_numa[numa_node] =
886 first_valid_buffer_pool_index;
890 vec_foreach (bp, bm->buffer_pools)
892 vlib_stats_collector_reg_t reg = { .private_data = bp - bm->buffer_pools };
893 if (bp->n_buffers == 0)
897 vlib_stats_add_gauge ("/buffer-pools/%v/cached", bp->name);
898 reg.collect_fn = buffer_gauges_collect_cached_fn;
899 vlib_stats_register_collector_fn (®);
901 reg.entry_index = vlib_stats_add_gauge ("/buffer-pools/%v/used", bp->name);
902 reg.collect_fn = buffer_gauges_collect_used_fn;
903 vlib_stats_register_collector_fn (®);
906 vlib_stats_add_gauge ("/buffer-pools/%v/available", bp->name);
907 reg.collect_fn = buffer_gauges_collect_available_fn;
908 vlib_stats_register_collector_fn (®);
913 vec_free (bmp_has_memory);
918 static clib_error_t *
919 vlib_buffers_configure (vlib_main_t * vm, unformat_input_t * input)
921 vlib_buffer_main_t *bm;
923 vlib_buffer_main_alloc (vm);
925 bm = vm->buffer_main;
926 bm->log2_page_size = CLIB_MEM_PAGE_SZ_UNKNOWN;
928 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
930 if (unformat (input, "buffers-per-numa %u", &bm->buffers_per_numa))
932 else if (unformat (input, "page-size %U", unformat_log2_page_size,
933 &bm->log2_page_size))
935 else if (unformat (input, "default data-size %u",
936 &bm->default_data_size))
939 return unformat_parse_error (input);
942 unformat_free (input);
946 VLIB_EARLY_CONFIG_FUNCTION (vlib_buffers_configure, "buffers");
948 #if VLIB_BUFFER_ALLOC_FAULT_INJECTOR > 0
950 vlib_buffer_alloc_may_fail (vlib_main_t * vm, u32 n_buffers)
954 r = random_f64 (&vm->buffer_alloc_success_seed);
956 /* Fail this request? */
957 if (r > vm->buffer_alloc_success_rate)
959 /* 5% chance of returning nothing at all */
960 if (r > vm->buffer_alloc_success_rate && r > 0.95)
968 vlib_buffer_set_alloc_free_callback (
969 vlib_main_t *vm, vlib_buffer_alloc_free_callback_t *alloc_callback_fn,
970 vlib_buffer_alloc_free_callback_t *free_callback_fn)
972 vlib_buffer_main_t *bm = vm->buffer_main;
973 if ((alloc_callback_fn && bm->alloc_callback_fn) ||
974 (free_callback_fn && bm->free_callback_fn))
976 bm->alloc_callback_fn = alloc_callback_fn;
977 bm->free_callback_fn = free_callback_fn;
983 * fd.io coding-style-patch-verification: ON
986 * eval: (c-set-style "gnu")