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;
52 vlib_buffer_length_in_chain_slow_path (vlib_main_t * vm,
53 vlib_buffer_t * b_first)
55 vlib_buffer_t *b = b_first;
56 uword l_first = b_first->current_length;
58 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
60 b = vlib_get_buffer (vm, b->next_buffer);
61 l += b->current_length;
63 b_first->total_length_not_including_first_buffer = l;
64 b_first->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
69 format_vlib_buffer (u8 * s, va_list * args)
71 vlib_buffer_t *b = va_arg (*args, vlib_buffer_t *);
72 uword indent = format_get_indent (s);
74 s = format (s, "current data %d, length %d, free-list %d, clone-count %u",
75 b->current_data, b->current_length, b->free_list_index,
78 if (b->flags & VLIB_BUFFER_TOTAL_LENGTH_VALID)
79 s = format (s, ", totlen-nifb %d",
80 b->total_length_not_including_first_buffer);
82 if (b->flags & VLIB_BUFFER_IS_TRACED)
83 s = format (s, ", trace 0x%x", b->trace_index);
85 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
87 vlib_main_t *vm = vlib_get_main ();
88 u32 next_buffer = b->next_buffer;
89 b = vlib_get_buffer (vm, next_buffer);
92 format (s, "\n%Unext-buffer 0x%x, segment length %d, clone-count %u",
93 format_white_space, indent, next_buffer, b->current_length,
101 format_vlib_buffer_and_data (u8 * s, va_list * args)
103 vlib_buffer_t *b = va_arg (*args, vlib_buffer_t *);
105 s = format (s, "%U, %U",
106 format_vlib_buffer, b,
107 format_hex_bytes, vlib_buffer_get_current (b), 64);
113 format_vlib_buffer_known_state (u8 * s, va_list * args)
115 vlib_buffer_known_state_t state = va_arg (*args, vlib_buffer_known_state_t);
120 case VLIB_BUFFER_UNKNOWN:
124 case VLIB_BUFFER_KNOWN_ALLOCATED:
125 t = "known-allocated";
128 case VLIB_BUFFER_KNOWN_FREE:
137 return format (s, "%s", t);
141 format_vlib_buffer_contents (u8 * s, va_list * va)
143 vlib_main_t *vm = va_arg (*va, vlib_main_t *);
144 vlib_buffer_t *b = va_arg (*va, vlib_buffer_t *);
148 vec_add (s, vlib_buffer_get_current (b), b->current_length);
149 if (!(b->flags & VLIB_BUFFER_NEXT_PRESENT))
151 b = vlib_get_buffer (vm, b->next_buffer);
158 vlib_validate_buffer_helper (vlib_main_t * vm,
160 uword follow_buffer_next, uword ** unique_hash)
162 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
163 vlib_buffer_main_t *bm = vm->buffer_main;
164 vlib_buffer_free_list_t *fl;
166 if (pool_is_free_index (bm->buffer_free_list_pool, b->free_list_index))
167 return format (0, "unknown free list 0x%x", b->free_list_index);
169 fl = pool_elt_at_index (bm->buffer_free_list_pool, b->free_list_index);
171 if ((signed) b->current_data < (signed) -VLIB_BUFFER_PRE_DATA_SIZE)
172 return format (0, "current data %d before pre-data", b->current_data);
174 if (b->current_data + b->current_length > fl->n_data_bytes)
175 return format (0, "%d-%d beyond end of buffer %d",
176 b->current_data, b->current_length, fl->n_data_bytes);
178 if (follow_buffer_next && (b->flags & VLIB_BUFFER_NEXT_PRESENT))
180 vlib_buffer_known_state_t k;
183 k = vlib_buffer_is_known (vm, b->next_buffer);
184 if (k != VLIB_BUFFER_KNOWN_ALLOCATED)
185 return format (0, "next 0x%x: %U",
186 b->next_buffer, format_vlib_buffer_known_state, k);
190 if (hash_get (*unique_hash, b->next_buffer))
191 return format (0, "duplicate buffer 0x%x", b->next_buffer);
193 hash_set1 (*unique_hash, b->next_buffer);
196 msg = vlib_validate_buffer (vm, b->next_buffer, follow_buffer_next);
199 result = format (0, "next 0x%x: %v", b->next_buffer, msg);
209 vlib_validate_buffer (vlib_main_t * vm, u32 bi, uword follow_buffer_next)
211 return vlib_validate_buffer_helper (vm, bi, follow_buffer_next,
212 /* unique_hash */ 0);
216 vlib_validate_buffers (vlib_main_t * vm,
218 uword next_buffer_stride,
220 vlib_buffer_known_state_t known_state,
221 uword follow_buffer_next)
224 u32 bi, *b = buffers;
225 vlib_buffer_known_state_t k;
226 u8 *msg = 0, *result = 0;
228 hash = hash_create (0, 0);
229 for (i = 0; i < n_buffers; i++)
232 b += next_buffer_stride;
234 /* Buffer is not unique. */
235 if (hash_get (hash, bi))
237 msg = format (0, "not unique");
241 k = vlib_buffer_is_known (vm, bi);
242 if (k != known_state)
244 msg = format (0, "is %U; expected %U",
245 format_vlib_buffer_known_state, k,
246 format_vlib_buffer_known_state, known_state);
250 msg = vlib_validate_buffer_helper (vm, bi, follow_buffer_next, &hash);
254 hash_set1 (hash, bi);
260 result = format (0, "0x%x: %v", bi, msg);
268 * Hand-craft a static vector w/ length 1, so vec_len(vlib_mains) =1
269 * and vlib_mains[0] = &vlib_global_main from the beginning of time.
271 * The only place which should ever expand vlib_mains is start_workers()
272 * in threads.c. It knows about the bootstrap vector.
279 } __attribute__ ((packed)) __bootstrap_vlib_main_vector
280 __attribute__ ((aligned (CLIB_CACHE_LINE_BYTES))) =
283 .vm = &vlib_global_main,
287 vlib_main_t **vlib_mains = &__bootstrap_vlib_main_vector.vm;
290 /* When dubugging validate that given buffers are either known allocated
293 vlib_buffer_validate_alloc_free (vlib_main_t * vm,
296 vlib_buffer_known_state_t expected_state)
299 uword i, bi, is_free;
304 ASSERT (vlib_get_thread_index () == 0);
306 /* smp disaster check */
307 if (vec_len (vlib_mains) > 1)
308 ASSERT (vm == vlib_mains[0]);
310 is_free = expected_state == VLIB_BUFFER_KNOWN_ALLOCATED;
312 for (i = 0; i < n_buffers; i++)
314 vlib_buffer_known_state_t known;
318 known = vlib_buffer_is_known (vm, bi);
319 if (known != expected_state)
323 (vm, "%s %U buffer 0x%x",
324 is_free ? "freeing" : "allocating",
325 format_vlib_buffer_known_state, known, bi);
328 vlib_buffer_set_known_state
330 is_free ? VLIB_BUFFER_KNOWN_FREE : VLIB_BUFFER_KNOWN_ALLOCATED);
335 vlib_buffer_merge_free_lists (vlib_buffer_free_list_t * dst,
336 vlib_buffer_free_list_t * src)
341 l = vec_len (src->buffers);
344 vec_add2_aligned (dst->buffers, d, l, CLIB_CACHE_LINE_BYTES);
345 clib_memcpy (d, src->buffers, l * sizeof (d[0]));
346 vec_free (src->buffers);
350 /* Add buffer free list. */
352 vlib_buffer_create_free_list_helper (vlib_main_t * vm,
354 u32 is_public, u32 is_default, u8 * name)
356 vlib_buffer_main_t *bm = vm->buffer_main;
357 vlib_buffer_free_list_t *f;
360 ASSERT (vlib_get_thread_index () == 0);
362 if (!is_default && pool_elts (bm->buffer_free_list_pool) == 0)
364 u32 default_free_free_list_index;
367 default_free_free_list_index =
368 vlib_buffer_create_free_list_helper
370 /* default buffer size */ VLIB_BUFFER_DEFAULT_FREE_LIST_BYTES,
375 ASSERT (default_free_free_list_index ==
376 VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX);
378 if (n_data_bytes == VLIB_BUFFER_DEFAULT_FREE_LIST_BYTES && is_public)
379 return default_free_free_list_index;
382 pool_get_aligned (bm->buffer_free_list_pool, f, CLIB_CACHE_LINE_BYTES);
384 memset (f, 0, sizeof (f[0]));
385 f->index = f - bm->buffer_free_list_pool;
386 f->n_data_bytes = vlib_buffer_round_size (n_data_bytes);
387 f->min_n_buffers_each_physmem_alloc = VLIB_FRAME_SIZE;
388 f->name = clib_mem_is_vec (name) ? name : format (0, "%s", name);
390 /* Setup free buffer template. */
391 f->buffer_init_template.free_list_index = f->index;
392 f->buffer_init_template.n_add_refs = 0;
396 uword *p = hash_get (bm->free_list_by_size, f->n_data_bytes);
398 hash_set (bm->free_list_by_size, f->n_data_bytes, f->index);
401 for (i = 1; i < vec_len (vlib_mains); i++)
403 vlib_buffer_main_t *wbm = vlib_mains[i]->buffer_main;
404 vlib_buffer_free_list_t *wf;
405 pool_get_aligned (wbm->buffer_free_list_pool,
406 wf, CLIB_CACHE_LINE_BYTES);
407 ASSERT (f - bm->buffer_free_list_pool ==
408 wf - wbm->buffer_free_list_pool);
418 vlib_buffer_create_free_list (vlib_main_t * vm, u32 n_data_bytes,
425 name = va_format (0, fmt, &va);
428 return vlib_buffer_create_free_list_helper (vm, n_data_bytes,
435 vlib_buffer_get_or_create_free_list (vlib_main_t * vm, u32 n_data_bytes,
438 u32 i = vlib_buffer_get_free_list_with_size (vm, n_data_bytes);
446 name = va_format (0, fmt, &va);
449 i = vlib_buffer_create_free_list_helper (vm, n_data_bytes,
459 del_free_list (vlib_main_t * vm, vlib_buffer_free_list_t * f)
463 for (i = 0; i < vec_len (f->buffer_memory_allocated); i++)
464 vm->os_physmem_free (f->buffer_memory_allocated[i]);
466 vec_free (f->buffer_memory_allocated);
467 vec_free (f->buffers);
470 /* Add buffer free list. */
472 vlib_buffer_delete_free_list_internal (vlib_main_t * vm, u32 free_list_index)
474 vlib_buffer_main_t *bm = vm->buffer_main;
475 vlib_buffer_free_list_t *f;
479 ASSERT (vlib_get_thread_index () == 0);
481 f = vlib_buffer_get_free_list (vm, free_list_index);
483 ASSERT (vec_len (f->buffers) == f->n_alloc);
484 merge_index = vlib_buffer_get_free_list_with_size (vm, f->n_data_bytes);
485 if (merge_index != ~0 && merge_index != free_list_index)
487 vlib_buffer_merge_free_lists (pool_elt_at_index
488 (bm->buffer_free_list_pool, merge_index),
492 del_free_list (vm, f);
495 memset (f, 0xab, sizeof (f[0]));
497 pool_put (bm->buffer_free_list_pool, f);
499 for (i = 1; i < vec_len (vlib_mains); i++)
501 bm = vlib_mains[i]->buffer_main;
502 f = vlib_buffer_get_free_list (vlib_mains[i], free_list_index);;
503 memset (f, 0xab, sizeof (f[0]));
504 pool_put (bm->buffer_free_list_pool, f);
508 /* Make sure free list has at least given number of free buffers. */
510 fill_free_list (vlib_main_t * vm,
511 vlib_buffer_free_list_t * fl, uword min_free_buffers)
513 vlib_buffer_t *buffers, *b;
516 u32 n_remaining, n_alloc, n_this_chunk;
518 /* Already have enough free buffers on free list? */
519 n = min_free_buffers - vec_len (fl->buffers);
521 return min_free_buffers;
523 /* Always allocate round number of buffers. */
524 n = round_pow2 (n, CLIB_CACHE_LINE_BYTES / sizeof (u32));
526 /* Always allocate new buffers in reasonably large sized chunks. */
527 n = clib_max (n, fl->min_n_buffers_each_physmem_alloc);
531 while (n_remaining > 0)
533 n_this_chunk = clib_min (n_remaining, 16);
535 n_bytes = n_this_chunk * (sizeof (b[0]) + fl->n_data_bytes);
537 /* drb: removed power-of-2 ASSERT */
538 buffers = vm->os_physmem_alloc_aligned (&vm->physmem_main,
540 sizeof (vlib_buffer_t));
544 /* Record chunk as being allocated so we can free it later. */
545 vec_add1 (fl->buffer_memory_allocated, buffers);
547 fl->n_alloc += n_this_chunk;
548 n_alloc += n_this_chunk;
549 n_remaining -= n_this_chunk;
552 vec_add2_aligned (fl->buffers, bi, n_this_chunk, CLIB_CACHE_LINE_BYTES);
553 for (i = 0; i < n_this_chunk; i++)
555 bi[i] = vlib_get_buffer_index (vm, b);
558 vlib_buffer_set_known_state (vm, bi[i], VLIB_BUFFER_KNOWN_FREE);
559 b = vlib_buffer_next_contiguous (b, fl->n_data_bytes);
562 memset (buffers, 0, n_bytes);
564 /* Initialize all new buffers. */
566 for (i = 0; i < n_this_chunk; i++)
568 vlib_buffer_init_for_free_list (b, fl);
569 b = vlib_buffer_next_contiguous (b, fl->n_data_bytes);
572 if (fl->buffer_init_function)
573 fl->buffer_init_function (vm, fl, bi, n_this_chunk);
579 alloc_from_free_list (vlib_main_t * vm,
580 vlib_buffer_free_list_t * free_list,
581 u32 * alloc_buffers, u32 n_alloc_buffers)
589 n_filled = fill_free_list (vm, free_list, n_alloc_buffers);
593 len = vec_len (free_list->buffers);
594 ASSERT (len >= n_alloc_buffers);
596 src = free_list->buffers + len - n_alloc_buffers;
597 clib_memcpy (dst, src, n_alloc_buffers * sizeof (u32));
599 _vec_len (free_list->buffers) -= n_alloc_buffers;
601 /* Verify that buffers are known free. */
602 vlib_buffer_validate_alloc_free (vm, alloc_buffers,
603 n_alloc_buffers, VLIB_BUFFER_KNOWN_FREE);
605 return n_alloc_buffers;
609 /* Allocate a given number of buffers into given array.
610 Returns number actually allocated which will be either zero or
613 vlib_buffer_alloc_internal (vlib_main_t * vm, u32 * buffers, u32 n_buffers)
615 vlib_buffer_main_t *bm = vm->buffer_main;
617 return alloc_from_free_list
619 pool_elt_at_index (bm->buffer_free_list_pool,
620 VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX),
625 vlib_buffer_alloc_from_free_list_internal (vlib_main_t * vm,
627 u32 n_buffers, u32 free_list_index)
629 vlib_buffer_main_t *bm = vm->buffer_main;
630 vlib_buffer_free_list_t *f;
631 f = pool_elt_at_index (bm->buffer_free_list_pool, free_list_index);
632 return alloc_from_free_list (vm, f, buffers, n_buffers);
636 vlib_set_buffer_free_callback (vlib_main_t * vm, void *fp)
638 vlib_buffer_main_t *bm = vm->buffer_main;
639 void *rv = bm->buffer_free_callback;
641 bm->buffer_free_callback = fp;
645 static_always_inline void
646 vlib_buffer_free_inline (vlib_main_t * vm,
647 u32 * buffers, u32 n_buffers, u32 follow_buffer_next)
649 vlib_buffer_main_t *bm = vm->buffer_main;
650 vlib_buffer_free_list_t *fl;
653 u32 (*cb) (vlib_main_t * vm, u32 * buffers, u32 n_buffers,
654 u32 follow_buffer_next);
656 cb = bm->buffer_free_callback;
658 if (PREDICT_FALSE (cb != 0))
659 n_buffers = (*cb) (vm, buffers, n_buffers, follow_buffer_next);
664 for (i = 0; i < n_buffers; i++)
669 b = vlib_get_buffer (vm, bi);
671 fl = vlib_buffer_get_buffer_free_list (vm, b, &fi);
673 /* The only current use of this callback: multicast recycle */
674 if (PREDICT_FALSE (fl->buffers_added_to_freelist_function != 0))
678 vlib_buffer_add_to_free_list
679 (vm, fl, buffers[i], (b->flags & VLIB_BUFFER_RECYCLE) == 0);
681 for (j = 0; j < vec_len (bm->announce_list); j++)
683 if (fl == bm->announce_list[j])
684 goto already_announced;
686 vec_add1 (bm->announce_list, fl);
692 if (PREDICT_TRUE ((b->flags & VLIB_BUFFER_RECYCLE) == 0))
698 vlib_buffer_t *nb = vlib_get_buffer (vm, bi);
700 next = nb->next_buffer;
705 vlib_buffer_validate_alloc_free (vm, &bi, 1,
706 VLIB_BUFFER_KNOWN_ALLOCATED);
707 vlib_buffer_add_to_free_list (vm, fl, bi, 1);
711 while (follow_buffer_next
712 && (flags & VLIB_BUFFER_NEXT_PRESENT));
717 if (vec_len (bm->announce_list))
719 vlib_buffer_free_list_t *fl;
720 for (i = 0; i < vec_len (bm->announce_list); i++)
722 fl = bm->announce_list[i];
723 fl->buffers_added_to_freelist_function (vm, fl);
725 _vec_len (bm->announce_list) = 0;
730 vlib_buffer_free_internal (vlib_main_t * vm, u32 * buffers, u32 n_buffers)
732 vlib_buffer_free_inline (vm, buffers, n_buffers, /* follow_buffer_next */
737 vlib_buffer_free_no_next_internal (vlib_main_t * vm, u32 * buffers,
740 vlib_buffer_free_inline (vm, buffers, n_buffers, /* follow_buffer_next */
744 /* Copy template packet data into buffers as they are allocated. */
745 static void __attribute__ ((unused))
746 vlib_packet_template_buffer_init (vlib_main_t * vm,
747 vlib_buffer_free_list_t * fl,
748 u32 * buffers, u32 n_buffers)
750 vlib_packet_template_t *t =
751 uword_to_pointer (fl->buffer_init_function_opaque,
752 vlib_packet_template_t *);
755 for (i = 0; i < n_buffers; i++)
757 vlib_buffer_t *b = vlib_get_buffer (vm, buffers[i]);
758 ASSERT (b->current_length == vec_len (t->packet_data));
759 clib_memcpy (vlib_buffer_get_current (b), t->packet_data,
765 vlib_packet_template_init (vlib_main_t * vm,
766 vlib_packet_template_t * t,
768 uword n_packet_data_bytes,
769 uword min_n_buffers_each_physmem_alloc,
772 vlib_buffer_main_t *bm = vm->buffer_main;
775 vlib_buffer_free_list_t *fl;
778 name = va_format (0, fmt, &va);
781 if (bm->cb.vlib_packet_template_init_cb)
782 bm->cb.vlib_packet_template_init_cb (vm, (void *) t, packet_data,
784 min_n_buffers_each_physmem_alloc,
787 vlib_worker_thread_barrier_sync (vm);
789 memset (t, 0, sizeof (t[0]));
791 vec_add (t->packet_data, packet_data, n_packet_data_bytes);
792 t->min_n_buffers_each_physmem_alloc = min_n_buffers_each_physmem_alloc;
794 t->free_list_index = vlib_buffer_create_free_list_helper
795 (vm, n_packet_data_bytes,
800 ASSERT (t->free_list_index != 0);
801 fl = vlib_buffer_get_free_list (vm, t->free_list_index);
802 fl->min_n_buffers_each_physmem_alloc = t->min_n_buffers_each_physmem_alloc;
804 fl->buffer_init_function = vlib_packet_template_buffer_init;
805 fl->buffer_init_function_opaque = pointer_to_uword (t);
807 fl->buffer_init_template.current_data = 0;
808 fl->buffer_init_template.current_length = n_packet_data_bytes;
809 fl->buffer_init_template.flags = 0;
810 fl->buffer_init_template.n_add_refs = 0;
811 vlib_worker_thread_barrier_release (vm);
815 vlib_packet_template_get_packet (vlib_main_t * vm,
816 vlib_packet_template_t * t, u32 * bi_result)
821 if (vlib_buffer_alloc (vm, &bi, 1) != 1)
826 b = vlib_get_buffer (vm, bi);
827 clib_memcpy (vlib_buffer_get_current (b),
828 t->packet_data, vec_len (t->packet_data));
829 b->current_length = vec_len (t->packet_data);
835 vlib_packet_template_get_packet_helper (vlib_main_t * vm,
836 vlib_packet_template_t * t)
838 word n = t->min_n_buffers_each_physmem_alloc;
839 word l = vec_len (t->packet_data);
843 ASSERT (vec_len (t->free_buffers) == 0);
845 vec_validate (t->free_buffers, n - 1);
846 n_alloc = vlib_buffer_alloc_from_free_list (vm, t->free_buffers,
847 n, t->free_list_index);
848 _vec_len (t->free_buffers) = n_alloc;
851 /* Append given data to end of buffer, possibly allocating new buffers. */
853 vlib_buffer_add_data (vlib_main_t * vm,
855 u32 buffer_index, void *data, u32 n_data_bytes)
857 u32 n_buffer_bytes, n_left, n_left_this_buffer, bi;
863 && 1 != vlib_buffer_alloc_from_free_list (vm, &bi, 1, free_list_index))
867 n_left = n_data_bytes;
868 n_buffer_bytes = vlib_buffer_free_list_buffer_size (vm, free_list_index);
870 b = vlib_get_buffer (vm, bi);
871 b->flags &= ~VLIB_BUFFER_TOTAL_LENGTH_VALID;
873 /* Get to the end of the chain before we try to append data... */
874 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
875 b = vlib_get_buffer (vm, b->next_buffer);
881 ASSERT (n_buffer_bytes >= b->current_length);
883 n_buffer_bytes - (b->current_data + b->current_length);
884 n = clib_min (n_left_this_buffer, n_left);
885 clib_memcpy (vlib_buffer_get_current (b) + b->current_length, d, n);
886 b->current_length += n;
893 vlib_buffer_alloc_from_free_list (vm, &b->next_buffer, 1,
897 b->flags |= VLIB_BUFFER_NEXT_PRESENT;
899 b = vlib_get_buffer (vm, b->next_buffer);
905 clib_error ("out of buffers");
910 vlib_buffer_chain_append_data_with_alloc (vlib_main_t * vm,
912 vlib_buffer_t * first,
913 vlib_buffer_t ** last,
914 void *data, u16 data_len)
916 vlib_buffer_t *l = *last;
918 vlib_buffer_free_list_buffer_size (vm, free_list_index);
920 ASSERT (n_buffer_bytes >= l->current_length + l->current_data);
923 u16 max = n_buffer_bytes - l->current_length - l->current_data;
927 vlib_buffer_alloc_from_free_list (vm, &l->next_buffer, 1,
930 *last = l = vlib_buffer_chain_buffer (vm, first, l, l->next_buffer);
931 max = n_buffer_bytes - l->current_length - l->current_data;
934 u16 len = (data_len > max) ? max : data_len;
935 clib_memcpy (vlib_buffer_get_current (l) + l->current_length,
937 vlib_buffer_chain_increase_length (first, l, len);
945 vlib_buffer_add_mem_range (vlib_main_t * vm, uword start, uword size)
947 vlib_buffer_main_t *bm = vm->buffer_main;
949 if (bm->buffer_mem_size == 0)
951 bm->buffer_mem_start = start;
952 bm->buffer_mem_size = size;
954 else if (start < bm->buffer_mem_start)
956 bm->buffer_mem_size += bm->buffer_mem_start - start;
957 bm->buffer_mem_start = start;
958 if (size > bm->buffer_mem_size)
959 bm->buffer_mem_size = size;
961 else if (start > bm->buffer_mem_start)
963 uword new_size = start - bm->buffer_mem_start + size;
964 if (new_size > bm->buffer_mem_size)
965 bm->buffer_mem_size = new_size;
968 if ((u64) bm->buffer_mem_size >
969 ((u64) 1 << (32 + CLIB_LOG2_CACHE_LINE_BYTES)))
971 clib_panic ("buffer memory size out of range!");
976 format_vlib_buffer_free_list (u8 * s, va_list * va)
978 vlib_buffer_free_list_t *f = va_arg (*va, vlib_buffer_free_list_t *);
979 u32 threadnum = va_arg (*va, u32);
980 uword bytes_alloc, bytes_free, n_free, size;
983 return format (s, "%=7s%=30s%=12s%=12s%=12s%=12s%=12s%=12s",
984 "Thread", "Name", "Index", "Size", "Alloc", "Free",
987 size = sizeof (vlib_buffer_t) + f->n_data_bytes;
988 n_free = vec_len (f->buffers);
989 bytes_alloc = size * f->n_alloc;
990 bytes_free = size * n_free;
992 s = format (s, "%7d%30v%12d%12d%=12U%=12U%=12d%=12d", threadnum,
993 f->name, f->index, f->n_data_bytes,
994 format_memory_size, bytes_alloc,
995 format_memory_size, bytes_free, f->n_alloc, n_free);
1000 static clib_error_t *
1001 show_buffers (vlib_main_t * vm,
1002 unformat_input_t * input, vlib_cli_command_t * cmd)
1004 vlib_buffer_main_t *bm;
1005 vlib_buffer_free_list_t *f;
1006 vlib_main_t *curr_vm;
1009 vlib_cli_output (vm, "%U", format_vlib_buffer_free_list, 0, 0);
1013 curr_vm = vlib_mains[vm_index];
1014 bm = curr_vm->buffer_main;
1017 pool_foreach (f, bm->buffer_free_list_pool, ({
1018 vlib_cli_output (vm, "%U", format_vlib_buffer_free_list, f, vm_index);
1024 while (vm_index < vec_len (vlib_mains));
1030 VLIB_CLI_COMMAND (show_buffers_command, static) = {
1031 .path = "show buffers",
1032 .short_help = "Show packet buffer allocation",
1033 .function = show_buffers,
1038 vlib_buffer_cb_init (struct vlib_main_t *vm)
1040 vlib_buffer_main_t *bm = vm->buffer_main;
1042 bm->cb.vlib_buffer_alloc_cb = &vlib_buffer_alloc_internal;
1043 bm->cb.vlib_buffer_alloc_from_free_list_cb =
1044 &vlib_buffer_alloc_from_free_list_internal;
1045 bm->cb.vlib_buffer_free_cb = &vlib_buffer_free_internal;
1046 bm->cb.vlib_buffer_free_no_next_cb = &vlib_buffer_free_no_next_internal;
1047 bm->cb.vlib_buffer_delete_free_list_cb =
1048 &vlib_buffer_delete_free_list_internal;
1053 * fd.io coding-style-patch-verification: ON
1056 * eval: (c-set-style "gnu")