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,
76 vlib_buffer_get_free_list_index (b), b->n_add_refs);
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
167 (bm->buffer_free_list_pool, vlib_buffer_get_free_list_index (b)))
168 return format (0, "unknown free list 0x%x",
169 vlib_buffer_get_free_list_index (b));
172 pool_elt_at_index (bm->buffer_free_list_pool,
173 vlib_buffer_get_free_list_index (b));
175 if ((signed) b->current_data < (signed) -VLIB_BUFFER_PRE_DATA_SIZE)
176 return format (0, "current data %d before pre-data", b->current_data);
178 if (b->current_data + b->current_length > fl->n_data_bytes)
179 return format (0, "%d-%d beyond end of buffer %d",
180 b->current_data, b->current_length, fl->n_data_bytes);
182 if (follow_buffer_next && (b->flags & VLIB_BUFFER_NEXT_PRESENT))
184 vlib_buffer_known_state_t k;
187 k = vlib_buffer_is_known (vm, b->next_buffer);
188 if (k != VLIB_BUFFER_KNOWN_ALLOCATED)
189 return format (0, "next 0x%x: %U",
190 b->next_buffer, format_vlib_buffer_known_state, k);
194 if (hash_get (*unique_hash, b->next_buffer))
195 return format (0, "duplicate buffer 0x%x", b->next_buffer);
197 hash_set1 (*unique_hash, b->next_buffer);
200 msg = vlib_validate_buffer (vm, b->next_buffer, follow_buffer_next);
203 result = format (0, "next 0x%x: %v", b->next_buffer, msg);
213 vlib_validate_buffer (vlib_main_t * vm, u32 bi, uword follow_buffer_next)
215 return vlib_validate_buffer_helper (vm, bi, follow_buffer_next,
216 /* unique_hash */ 0);
220 vlib_validate_buffers (vlib_main_t * vm,
222 uword next_buffer_stride,
224 vlib_buffer_known_state_t known_state,
225 uword follow_buffer_next)
228 u32 bi, *b = buffers;
229 vlib_buffer_known_state_t k;
230 u8 *msg = 0, *result = 0;
232 hash = hash_create (0, 0);
233 for (i = 0; i < n_buffers; i++)
236 b += next_buffer_stride;
238 /* Buffer is not unique. */
239 if (hash_get (hash, bi))
241 msg = format (0, "not unique");
245 k = vlib_buffer_is_known (vm, bi);
246 if (k != known_state)
248 msg = format (0, "is %U; expected %U",
249 format_vlib_buffer_known_state, k,
250 format_vlib_buffer_known_state, known_state);
254 msg = vlib_validate_buffer_helper (vm, bi, follow_buffer_next, &hash);
258 hash_set1 (hash, bi);
264 result = format (0, "0x%x: %v", bi, msg);
272 * Hand-craft a static vector w/ length 1, so vec_len(vlib_mains) =1
273 * and vlib_mains[0] = &vlib_global_main from the beginning of time.
275 * The only place which should ever expand vlib_mains is start_workers()
276 * in threads.c. It knows about the bootstrap vector.
283 } __attribute__ ((packed)) __bootstrap_vlib_main_vector
284 __attribute__ ((aligned (CLIB_CACHE_LINE_BYTES))) =
287 .vm = &vlib_global_main,
291 vlib_main_t **vlib_mains = &__bootstrap_vlib_main_vector.vm;
294 /* When dubugging validate that given buffers are either known allocated
297 vlib_buffer_validate_alloc_free (vlib_main_t * vm,
300 vlib_buffer_known_state_t expected_state)
303 uword i, bi, is_free;
308 ASSERT (vlib_get_thread_index () == 0);
310 /* smp disaster check */
311 if (vec_len (vlib_mains) > 1)
312 ASSERT (vm == vlib_mains[0]);
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);
323 if (known != expected_state)
327 (vm, "%s %U buffer 0x%x",
328 is_free ? "freeing" : "allocating",
329 format_vlib_buffer_known_state, known, bi);
332 vlib_buffer_set_known_state
334 is_free ? VLIB_BUFFER_KNOWN_FREE : VLIB_BUFFER_KNOWN_ALLOCATED);
339 vlib_buffer_merge_free_lists (vlib_buffer_free_list_t * dst,
340 vlib_buffer_free_list_t * src)
345 l = vec_len (src->buffers);
348 vec_add2_aligned (dst->buffers, d, l, CLIB_CACHE_LINE_BYTES);
349 clib_memcpy (d, src->buffers, l * sizeof (d[0]));
350 vec_free (src->buffers);
354 /* Add buffer free list. */
356 vlib_buffer_create_free_list_helper (vlib_main_t * vm,
358 u32 is_public, u32 is_default, u8 * name)
360 vlib_buffer_main_t *bm = vm->buffer_main;
361 vlib_buffer_free_list_t *f;
364 ASSERT (vlib_get_thread_index () == 0);
366 if (!is_default && pool_elts (bm->buffer_free_list_pool) == 0)
368 u32 default_free_free_list_index;
371 default_free_free_list_index =
372 vlib_buffer_create_free_list_helper
374 /* default buffer size */ VLIB_BUFFER_DEFAULT_FREE_LIST_BYTES,
379 ASSERT (default_free_free_list_index ==
380 VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX);
382 if (n_data_bytes == VLIB_BUFFER_DEFAULT_FREE_LIST_BYTES && is_public)
383 return default_free_free_list_index;
386 pool_get_aligned (bm->buffer_free_list_pool, f, CLIB_CACHE_LINE_BYTES);
388 memset (f, 0, sizeof (f[0]));
389 f->index = f - bm->buffer_free_list_pool;
390 f->n_data_bytes = vlib_buffer_round_size (n_data_bytes);
391 f->min_n_buffers_each_physmem_alloc = VLIB_FRAME_SIZE;
392 f->name = clib_mem_is_vec (name) ? name : format (0, "%s", name);
394 /* Setup free buffer template. */
395 vlib_buffer_set_free_list_index (&f->buffer_init_template, f->index);
396 f->buffer_init_template.n_add_refs = 0;
400 uword *p = hash_get (bm->free_list_by_size, f->n_data_bytes);
402 hash_set (bm->free_list_by_size, f->n_data_bytes, f->index);
405 for (i = 1; i < vec_len (vlib_mains); i++)
407 vlib_buffer_main_t *wbm = vlib_mains[i]->buffer_main;
408 vlib_buffer_free_list_t *wf;
409 pool_get_aligned (wbm->buffer_free_list_pool,
410 wf, CLIB_CACHE_LINE_BYTES);
411 ASSERT (f - bm->buffer_free_list_pool ==
412 wf - wbm->buffer_free_list_pool);
422 vlib_buffer_create_free_list (vlib_main_t * vm, u32 n_data_bytes,
429 name = va_format (0, fmt, &va);
432 return vlib_buffer_create_free_list_helper (vm, n_data_bytes,
439 vlib_buffer_get_or_create_free_list (vlib_main_t * vm, u32 n_data_bytes,
442 u32 i = vlib_buffer_get_free_list_with_size (vm, n_data_bytes);
450 name = va_format (0, fmt, &va);
453 i = vlib_buffer_create_free_list_helper (vm, n_data_bytes,
463 del_free_list (vlib_main_t * vm, vlib_buffer_free_list_t * f)
467 for (i = 0; i < vec_len (f->buffer_memory_allocated); i++)
468 vm->os_physmem_free (f->buffer_memory_allocated[i]);
470 vec_free (f->buffer_memory_allocated);
471 vec_free (f->buffers);
474 /* Add buffer free list. */
476 vlib_buffer_delete_free_list_internal (vlib_main_t * vm, u32 free_list_index)
478 vlib_buffer_main_t *bm = vm->buffer_main;
479 vlib_buffer_free_list_t *f;
483 ASSERT (vlib_get_thread_index () == 0);
485 f = vlib_buffer_get_free_list (vm, free_list_index);
487 ASSERT (vec_len (f->buffers) == f->n_alloc);
488 merge_index = vlib_buffer_get_free_list_with_size (vm, f->n_data_bytes);
489 if (merge_index != ~0 && merge_index != free_list_index)
491 vlib_buffer_merge_free_lists (pool_elt_at_index
492 (bm->buffer_free_list_pool, merge_index),
496 del_free_list (vm, f);
499 memset (f, 0xab, sizeof (f[0]));
501 pool_put (bm->buffer_free_list_pool, f);
503 for (i = 1; i < vec_len (vlib_mains); i++)
505 bm = vlib_mains[i]->buffer_main;
506 f = vlib_buffer_get_free_list (vlib_mains[i], free_list_index);;
507 memset (f, 0xab, sizeof (f[0]));
508 pool_put (bm->buffer_free_list_pool, f);
512 /* Make sure free list has at least given number of free buffers. */
514 fill_free_list (vlib_main_t * vm,
515 vlib_buffer_free_list_t * fl, uword min_free_buffers)
517 vlib_buffer_t *buffers, *b;
520 u32 n_remaining, n_alloc, n_this_chunk;
522 /* Already have enough free buffers on free list? */
523 n = min_free_buffers - vec_len (fl->buffers);
525 return min_free_buffers;
527 /* Always allocate round number of buffers. */
528 n = round_pow2 (n, CLIB_CACHE_LINE_BYTES / sizeof (u32));
530 /* Always allocate new buffers in reasonably large sized chunks. */
531 n = clib_max (n, fl->min_n_buffers_each_physmem_alloc);
535 while (n_remaining > 0)
537 n_this_chunk = clib_min (n_remaining, 16);
539 n_bytes = n_this_chunk * (sizeof (b[0]) + fl->n_data_bytes);
541 /* drb: removed power-of-2 ASSERT */
542 buffers = vm->os_physmem_alloc_aligned (&vm->physmem_main,
544 sizeof (vlib_buffer_t));
548 /* Record chunk as being allocated so we can free it later. */
549 vec_add1 (fl->buffer_memory_allocated, buffers);
551 fl->n_alloc += n_this_chunk;
552 n_alloc += n_this_chunk;
553 n_remaining -= n_this_chunk;
556 vec_add2_aligned (fl->buffers, bi, n_this_chunk, CLIB_CACHE_LINE_BYTES);
557 for (i = 0; i < n_this_chunk; i++)
559 bi[i] = vlib_get_buffer_index (vm, b);
562 vlib_buffer_set_known_state (vm, bi[i], VLIB_BUFFER_KNOWN_FREE);
563 b = vlib_buffer_next_contiguous (b, fl->n_data_bytes);
566 memset (buffers, 0, n_bytes);
568 /* Initialize all new buffers. */
570 for (i = 0; i < n_this_chunk; i++)
572 vlib_buffer_init_for_free_list (b, fl);
573 b = vlib_buffer_next_contiguous (b, fl->n_data_bytes);
576 if (fl->buffer_init_function)
577 fl->buffer_init_function (vm, fl, bi, n_this_chunk);
583 alloc_from_free_list (vlib_main_t * vm,
584 vlib_buffer_free_list_t * free_list,
585 u32 * alloc_buffers, u32 n_alloc_buffers)
593 n_filled = fill_free_list (vm, free_list, n_alloc_buffers);
597 len = vec_len (free_list->buffers);
598 ASSERT (len >= n_alloc_buffers);
600 src = free_list->buffers + len - n_alloc_buffers;
601 clib_memcpy (dst, src, n_alloc_buffers * sizeof (u32));
603 _vec_len (free_list->buffers) -= n_alloc_buffers;
605 /* Verify that buffers are known free. */
606 vlib_buffer_validate_alloc_free (vm, alloc_buffers,
607 n_alloc_buffers, VLIB_BUFFER_KNOWN_FREE);
609 return n_alloc_buffers;
613 /* Allocate a given number of buffers into given array.
614 Returns number actually allocated which will be either zero or
617 vlib_buffer_alloc_internal (vlib_main_t * vm, u32 * buffers, u32 n_buffers)
619 vlib_buffer_main_t *bm = vm->buffer_main;
621 return alloc_from_free_list
623 pool_elt_at_index (bm->buffer_free_list_pool,
624 VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX),
629 vlib_buffer_alloc_from_free_list_internal (vlib_main_t * vm,
631 u32 n_buffers, u32 free_list_index)
633 vlib_buffer_main_t *bm = vm->buffer_main;
634 vlib_buffer_free_list_t *f;
635 f = pool_elt_at_index (bm->buffer_free_list_pool, free_list_index);
636 return alloc_from_free_list (vm, f, buffers, n_buffers);
640 vlib_set_buffer_free_callback (vlib_main_t * vm, void *fp)
642 vlib_buffer_main_t *bm = vm->buffer_main;
643 void *rv = bm->buffer_free_callback;
645 bm->buffer_free_callback = fp;
649 static_always_inline void
650 vlib_buffer_free_inline (vlib_main_t * vm,
651 u32 * buffers, u32 n_buffers, u32 follow_buffer_next)
653 vlib_buffer_main_t *bm = vm->buffer_main;
654 vlib_buffer_free_list_t *fl;
657 u32 (*cb) (vlib_main_t * vm, u32 * buffers, u32 n_buffers,
658 u32 follow_buffer_next);
660 cb = bm->buffer_free_callback;
662 if (PREDICT_FALSE (cb != 0))
663 n_buffers = (*cb) (vm, buffers, n_buffers, follow_buffer_next);
668 for (i = 0; i < n_buffers; i++)
673 b = vlib_get_buffer (vm, bi);
675 fl = vlib_buffer_get_buffer_free_list (vm, b, &fi);
677 /* The only current use of this callback: multicast recycle */
678 if (PREDICT_FALSE (fl->buffers_added_to_freelist_function != 0))
682 vlib_buffer_add_to_free_list
683 (vm, fl, buffers[i], (b->flags & VLIB_BUFFER_RECYCLE) == 0);
685 for (j = 0; j < vec_len (bm->announce_list); j++)
687 if (fl == bm->announce_list[j])
688 goto already_announced;
690 vec_add1 (bm->announce_list, fl);
696 if (PREDICT_TRUE ((b->flags & VLIB_BUFFER_RECYCLE) == 0))
702 vlib_buffer_t *nb = vlib_get_buffer (vm, bi);
704 next = nb->next_buffer;
709 vlib_buffer_validate_alloc_free (vm, &bi, 1,
710 VLIB_BUFFER_KNOWN_ALLOCATED);
711 vlib_buffer_add_to_free_list (vm, fl, bi, 1);
715 while (follow_buffer_next
716 && (flags & VLIB_BUFFER_NEXT_PRESENT));
721 if (vec_len (bm->announce_list))
723 vlib_buffer_free_list_t *fl;
724 for (i = 0; i < vec_len (bm->announce_list); i++)
726 fl = bm->announce_list[i];
727 fl->buffers_added_to_freelist_function (vm, fl);
729 _vec_len (bm->announce_list) = 0;
734 vlib_buffer_free_internal (vlib_main_t * vm, u32 * buffers, u32 n_buffers)
736 vlib_buffer_free_inline (vm, buffers, n_buffers, /* follow_buffer_next */
741 vlib_buffer_free_no_next_internal (vlib_main_t * vm, u32 * buffers,
744 vlib_buffer_free_inline (vm, buffers, n_buffers, /* follow_buffer_next */
748 /* Copy template packet data into buffers as they are allocated. */
749 static void __attribute__ ((unused))
750 vlib_packet_template_buffer_init (vlib_main_t * vm,
751 vlib_buffer_free_list_t * fl,
752 u32 * buffers, u32 n_buffers)
754 vlib_packet_template_t *t =
755 uword_to_pointer (fl->buffer_init_function_opaque,
756 vlib_packet_template_t *);
759 for (i = 0; i < n_buffers; i++)
761 vlib_buffer_t *b = vlib_get_buffer (vm, buffers[i]);
762 ASSERT (b->current_length == vec_len (t->packet_data));
763 clib_memcpy (vlib_buffer_get_current (b), t->packet_data,
769 vlib_packet_template_init (vlib_main_t * vm,
770 vlib_packet_template_t * t,
772 uword n_packet_data_bytes,
773 uword min_n_buffers_each_physmem_alloc,
776 vlib_buffer_main_t *bm = vm->buffer_main;
779 vlib_buffer_free_list_t *fl;
782 name = va_format (0, fmt, &va);
785 if (bm->cb.vlib_packet_template_init_cb)
786 bm->cb.vlib_packet_template_init_cb (vm, (void *) t, packet_data,
788 min_n_buffers_each_physmem_alloc,
791 vlib_worker_thread_barrier_sync (vm);
793 memset (t, 0, sizeof (t[0]));
795 vec_add (t->packet_data, packet_data, n_packet_data_bytes);
796 t->min_n_buffers_each_physmem_alloc = min_n_buffers_each_physmem_alloc;
798 t->free_list_index = vlib_buffer_create_free_list_helper
799 (vm, n_packet_data_bytes,
804 ASSERT (t->free_list_index != 0);
805 fl = vlib_buffer_get_free_list (vm, t->free_list_index);
806 fl->min_n_buffers_each_physmem_alloc = t->min_n_buffers_each_physmem_alloc;
808 fl->buffer_init_function = vlib_packet_template_buffer_init;
809 fl->buffer_init_function_opaque = pointer_to_uword (t);
811 fl->buffer_init_template.current_data = 0;
812 fl->buffer_init_template.current_length = n_packet_data_bytes;
813 fl->buffer_init_template.flags = 0;
814 fl->buffer_init_template.n_add_refs = 0;
815 vlib_worker_thread_barrier_release (vm);
819 vlib_packet_template_get_packet (vlib_main_t * vm,
820 vlib_packet_template_t * t, u32 * bi_result)
825 if (vlib_buffer_alloc (vm, &bi, 1) != 1)
830 b = vlib_get_buffer (vm, bi);
831 clib_memcpy (vlib_buffer_get_current (b),
832 t->packet_data, vec_len (t->packet_data));
833 b->current_length = vec_len (t->packet_data);
839 vlib_packet_template_get_packet_helper (vlib_main_t * vm,
840 vlib_packet_template_t * t)
842 word n = t->min_n_buffers_each_physmem_alloc;
843 word l = vec_len (t->packet_data);
847 ASSERT (vec_len (t->free_buffers) == 0);
849 vec_validate (t->free_buffers, n - 1);
850 n_alloc = vlib_buffer_alloc_from_free_list (vm, t->free_buffers,
851 n, t->free_list_index);
852 _vec_len (t->free_buffers) = n_alloc;
855 /* Append given data to end of buffer, possibly allocating new buffers. */
857 vlib_buffer_add_data (vlib_main_t * vm,
859 u32 buffer_index, void *data, u32 n_data_bytes)
861 u32 n_buffer_bytes, n_left, n_left_this_buffer, bi;
867 && 1 != vlib_buffer_alloc_from_free_list (vm, &bi, 1, free_list_index))
871 n_left = n_data_bytes;
872 n_buffer_bytes = vlib_buffer_free_list_buffer_size (vm, free_list_index);
874 b = vlib_get_buffer (vm, bi);
875 b->flags &= ~VLIB_BUFFER_TOTAL_LENGTH_VALID;
877 /* Get to the end of the chain before we try to append data... */
878 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
879 b = vlib_get_buffer (vm, b->next_buffer);
885 ASSERT (n_buffer_bytes >= b->current_length);
887 n_buffer_bytes - (b->current_data + b->current_length);
888 n = clib_min (n_left_this_buffer, n_left);
889 clib_memcpy (vlib_buffer_get_current (b) + b->current_length, d, n);
890 b->current_length += n;
897 vlib_buffer_alloc_from_free_list (vm, &b->next_buffer, 1,
901 b->flags |= VLIB_BUFFER_NEXT_PRESENT;
903 b = vlib_get_buffer (vm, b->next_buffer);
909 clib_error ("out of buffers");
914 vlib_buffer_chain_append_data_with_alloc (vlib_main_t * vm,
916 vlib_buffer_t * first,
917 vlib_buffer_t ** last,
918 void *data, u16 data_len)
920 vlib_buffer_t *l = *last;
922 vlib_buffer_free_list_buffer_size (vm, free_list_index);
924 ASSERT (n_buffer_bytes >= l->current_length + l->current_data);
927 u16 max = n_buffer_bytes - l->current_length - l->current_data;
931 vlib_buffer_alloc_from_free_list (vm, &l->next_buffer, 1,
934 *last = l = vlib_buffer_chain_buffer (vm, first, l, l->next_buffer);
935 max = n_buffer_bytes - l->current_length - l->current_data;
938 u16 len = (data_len > max) ? max : data_len;
939 clib_memcpy (vlib_buffer_get_current (l) + l->current_length,
941 vlib_buffer_chain_increase_length (first, l, len);
949 vlib_buffer_add_mem_range (vlib_main_t * vm, uword start, uword size)
951 vlib_buffer_main_t *bm = vm->buffer_main;
953 if (bm->buffer_mem_size == 0)
955 bm->buffer_mem_start = start;
956 bm->buffer_mem_size = size;
958 else if (start < bm->buffer_mem_start)
960 bm->buffer_mem_size += bm->buffer_mem_start - start;
961 bm->buffer_mem_start = start;
962 if (size > bm->buffer_mem_size)
963 bm->buffer_mem_size = size;
965 else if (start > bm->buffer_mem_start)
967 uword new_size = start - bm->buffer_mem_start + size;
968 if (new_size > bm->buffer_mem_size)
969 bm->buffer_mem_size = new_size;
972 if ((u64) bm->buffer_mem_size >
973 ((u64) 1 << (32 + CLIB_LOG2_CACHE_LINE_BYTES)))
975 clib_panic ("buffer memory size out of range!");
980 format_vlib_buffer_free_list (u8 * s, va_list * va)
982 vlib_buffer_free_list_t *f = va_arg (*va, vlib_buffer_free_list_t *);
983 u32 threadnum = va_arg (*va, u32);
984 uword bytes_alloc, bytes_free, n_free, size;
987 return format (s, "%=7s%=30s%=12s%=12s%=12s%=12s%=12s%=12s",
988 "Thread", "Name", "Index", "Size", "Alloc", "Free",
991 size = sizeof (vlib_buffer_t) + f->n_data_bytes;
992 n_free = vec_len (f->buffers);
993 bytes_alloc = size * f->n_alloc;
994 bytes_free = size * n_free;
996 s = format (s, "%7d%30v%12d%12d%=12U%=12U%=12d%=12d", threadnum,
997 f->name, f->index, f->n_data_bytes,
998 format_memory_size, bytes_alloc,
999 format_memory_size, bytes_free, f->n_alloc, n_free);
1004 static clib_error_t *
1005 show_buffers (vlib_main_t * vm,
1006 unformat_input_t * input, vlib_cli_command_t * cmd)
1008 vlib_buffer_main_t *bm;
1009 vlib_buffer_free_list_t *f;
1010 vlib_main_t *curr_vm;
1013 vlib_cli_output (vm, "%U", format_vlib_buffer_free_list, 0, 0);
1017 curr_vm = vlib_mains[vm_index];
1018 bm = curr_vm->buffer_main;
1021 pool_foreach (f, bm->buffer_free_list_pool, ({
1022 vlib_cli_output (vm, "%U", format_vlib_buffer_free_list, f, vm_index);
1028 while (vm_index < vec_len (vlib_mains));
1034 VLIB_CLI_COMMAND (show_buffers_command, static) = {
1035 .path = "show buffers",
1036 .short_help = "Show packet buffer allocation",
1037 .function = show_buffers,
1042 vlib_buffer_cb_init (struct vlib_main_t *vm)
1044 vlib_buffer_main_t *bm = vm->buffer_main;
1046 bm->cb.vlib_buffer_alloc_cb = &vlib_buffer_alloc_internal;
1047 bm->cb.vlib_buffer_alloc_from_free_list_cb =
1048 &vlib_buffer_alloc_from_free_list_internal;
1049 bm->cb.vlib_buffer_free_cb = &vlib_buffer_free_internal;
1050 bm->cb.vlib_buffer_free_no_next_cb = &vlib_buffer_free_no_next_internal;
1051 bm->cb.vlib_buffer_delete_free_list_cb =
1052 &vlib_buffer_delete_free_list_internal;
1057 * fd.io coding-style-patch-verification: ON
1060 * eval: (c-set-style "gnu")