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 is_free = expected_state == VLIB_BUFFER_KNOWN_ALLOCATED;
310 for (i = 0; i < n_buffers; i++)
312 vlib_buffer_known_state_t known;
316 known = vlib_buffer_is_known (vm, bi);
317 if (known != expected_state)
321 (vm, "%s %U buffer 0x%x",
322 is_free ? "freeing" : "allocating",
323 format_vlib_buffer_known_state, known, bi);
326 vlib_buffer_set_known_state
328 is_free ? VLIB_BUFFER_KNOWN_FREE : VLIB_BUFFER_KNOWN_ALLOCATED);
333 vlib_buffer_merge_free_lists (vlib_buffer_free_list_t * dst,
334 vlib_buffer_free_list_t * src)
339 l = vec_len (src->buffers);
342 vec_add2_aligned (dst->buffers, d, l, CLIB_CACHE_LINE_BYTES);
343 clib_memcpy (d, src->buffers, l * sizeof (d[0]));
344 vec_free (src->buffers);
348 /* Add buffer free list. */
350 vlib_buffer_create_free_list_helper (vlib_main_t * vm,
352 u32 is_public, u32 is_default, u8 * name)
354 vlib_buffer_main_t *bm = vm->buffer_main;
355 vlib_buffer_free_list_t *f;
358 ASSERT (vlib_get_thread_index () == 0);
360 if (!is_default && pool_elts (bm->buffer_free_list_pool) == 0)
362 u32 default_free_free_list_index;
365 default_free_free_list_index =
366 vlib_buffer_create_free_list_helper
368 /* default buffer size */ VLIB_BUFFER_DEFAULT_FREE_LIST_BYTES,
373 ASSERT (default_free_free_list_index ==
374 VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX);
376 if (n_data_bytes == VLIB_BUFFER_DEFAULT_FREE_LIST_BYTES && is_public)
377 return default_free_free_list_index;
380 pool_get_aligned (bm->buffer_free_list_pool, f, CLIB_CACHE_LINE_BYTES);
382 memset (f, 0, sizeof (f[0]));
383 f->index = f - bm->buffer_free_list_pool;
384 f->n_data_bytes = vlib_buffer_round_size (n_data_bytes);
385 f->min_n_buffers_each_physmem_alloc = VLIB_FRAME_SIZE;
386 f->name = clib_mem_is_vec (name) ? name : format (0, "%s", name);
388 /* Setup free buffer template. */
389 vlib_buffer_set_free_list_index (&f->buffer_init_template, f->index);
390 f->buffer_init_template.n_add_refs = 0;
394 uword *p = hash_get (bm->free_list_by_size, f->n_data_bytes);
396 hash_set (bm->free_list_by_size, f->n_data_bytes, f->index);
399 clib_spinlock_init (&f->global_buffers_lock);
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;
514 vlib_buffer_free_list_t *mfl;
517 u32 n_remaining, n_alloc, n_this_chunk;
519 /* Already have enough free buffers on free list? */
520 n = min_free_buffers - vec_len (fl->buffers);
522 return min_free_buffers;
524 mfl = vlib_buffer_get_free_list (vlib_mains[0], fl->index);
525 if (vec_len (mfl->global_buffers) > 0)
528 clib_spinlock_lock (&mfl->global_buffers_lock);
529 n_copy = clib_min (vec_len (mfl->global_buffers), n);
530 n_left = vec_len (mfl->global_buffers) - n_copy;
531 vec_add_aligned (fl->buffers, mfl->global_buffers + n_left, n_copy,
532 CLIB_CACHE_LINE_BYTES);
533 _vec_len (mfl->global_buffers) = n_left;
534 clib_spinlock_unlock (&mfl->global_buffers_lock);
535 n = min_free_buffers - vec_len (fl->buffers);
537 return min_free_buffers;
540 /* Always allocate round number of buffers. */
541 n = round_pow2 (n, CLIB_CACHE_LINE_BYTES / sizeof (u32));
543 /* Always allocate new buffers in reasonably large sized chunks. */
544 n = clib_max (n, fl->min_n_buffers_each_physmem_alloc);
548 while (n_remaining > 0)
550 n_this_chunk = clib_min (n_remaining, 16);
552 n_bytes = n_this_chunk * (sizeof (b[0]) + fl->n_data_bytes);
554 /* drb: removed power-of-2 ASSERT */
555 buffers = vm->os_physmem_alloc_aligned (&vm->physmem_main,
557 sizeof (vlib_buffer_t));
561 /* Record chunk as being allocated so we can free it later. */
562 vec_add1 (fl->buffer_memory_allocated, buffers);
564 fl->n_alloc += n_this_chunk;
565 n_alloc += n_this_chunk;
566 n_remaining -= n_this_chunk;
569 vec_add2_aligned (fl->buffers, bi, n_this_chunk, CLIB_CACHE_LINE_BYTES);
570 for (i = 0; i < n_this_chunk; i++)
572 bi[i] = vlib_get_buffer_index (vm, b);
575 vlib_buffer_set_known_state (vm, bi[i], VLIB_BUFFER_KNOWN_FREE);
576 b = vlib_buffer_next_contiguous (b, fl->n_data_bytes);
579 memset (buffers, 0, n_bytes);
581 /* Initialize all new buffers. */
583 for (i = 0; i < n_this_chunk; i++)
585 vlib_buffer_init_for_free_list (b, fl);
586 b = vlib_buffer_next_contiguous (b, fl->n_data_bytes);
589 if (fl->buffer_init_function)
590 fl->buffer_init_function (vm, fl, bi, n_this_chunk);
596 alloc_from_free_list (vlib_main_t * vm,
597 vlib_buffer_free_list_t * free_list,
598 u32 * alloc_buffers, u32 n_alloc_buffers)
606 n_filled = fill_free_list (vm, free_list, n_alloc_buffers);
610 len = vec_len (free_list->buffers);
611 ASSERT (len >= n_alloc_buffers);
613 src = free_list->buffers + len - n_alloc_buffers;
614 clib_memcpy (dst, src, n_alloc_buffers * sizeof (u32));
616 _vec_len (free_list->buffers) -= n_alloc_buffers;
618 /* Verify that buffers are known free. */
619 vlib_buffer_validate_alloc_free (vm, alloc_buffers,
620 n_alloc_buffers, VLIB_BUFFER_KNOWN_FREE);
622 return n_alloc_buffers;
626 /* Allocate a given number of buffers into given array.
627 Returns number actually allocated which will be either zero or
630 vlib_buffer_alloc_internal (vlib_main_t * vm, u32 * buffers, u32 n_buffers)
632 vlib_buffer_main_t *bm = vm->buffer_main;
634 return alloc_from_free_list
636 pool_elt_at_index (bm->buffer_free_list_pool,
637 VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX),
642 vlib_buffer_alloc_from_free_list_internal (vlib_main_t * vm,
644 u32 n_buffers, u32 free_list_index)
646 vlib_buffer_main_t *bm = vm->buffer_main;
647 vlib_buffer_free_list_t *f;
648 f = pool_elt_at_index (bm->buffer_free_list_pool, free_list_index);
649 return alloc_from_free_list (vm, f, buffers, n_buffers);
653 vlib_set_buffer_free_callback (vlib_main_t * vm, void *fp)
655 vlib_buffer_main_t *bm = vm->buffer_main;
656 void *rv = bm->buffer_free_callback;
658 bm->buffer_free_callback = fp;
662 static_always_inline void
663 vlib_buffer_free_inline (vlib_main_t * vm,
664 u32 * buffers, u32 n_buffers, u32 follow_buffer_next)
666 vlib_buffer_main_t *bm = vm->buffer_main;
667 vlib_buffer_free_list_t *fl;
670 u32 (*cb) (vlib_main_t * vm, u32 * buffers, u32 n_buffers,
671 u32 follow_buffer_next);
673 cb = bm->buffer_free_callback;
675 if (PREDICT_FALSE (cb != 0))
676 n_buffers = (*cb) (vm, buffers, n_buffers, follow_buffer_next);
681 for (i = 0; i < n_buffers; i++)
686 b = vlib_get_buffer (vm, bi);
688 fl = vlib_buffer_get_buffer_free_list (vm, b, &fi);
690 /* The only current use of this callback: multicast recycle */
691 if (PREDICT_FALSE (fl->buffers_added_to_freelist_function != 0))
695 vlib_buffer_add_to_free_list
696 (vm, fl, buffers[i], (b->flags & VLIB_BUFFER_RECYCLE) == 0);
698 for (j = 0; j < vec_len (bm->announce_list); j++)
700 if (fl == bm->announce_list[j])
701 goto already_announced;
703 vec_add1 (bm->announce_list, fl);
709 if (PREDICT_TRUE ((b->flags & VLIB_BUFFER_RECYCLE) == 0))
715 vlib_buffer_t *nb = vlib_get_buffer (vm, bi);
717 next = nb->next_buffer;
722 vlib_buffer_validate_alloc_free (vm, &bi, 1,
723 VLIB_BUFFER_KNOWN_ALLOCATED);
724 vlib_buffer_add_to_free_list (vm, fl, bi, 1);
728 while (follow_buffer_next
729 && (flags & VLIB_BUFFER_NEXT_PRESENT));
734 if (vec_len (bm->announce_list))
736 vlib_buffer_free_list_t *fl;
737 for (i = 0; i < vec_len (bm->announce_list); i++)
739 fl = bm->announce_list[i];
740 fl->buffers_added_to_freelist_function (vm, fl);
742 _vec_len (bm->announce_list) = 0;
747 vlib_buffer_free_internal (vlib_main_t * vm, u32 * buffers, u32 n_buffers)
749 vlib_buffer_free_inline (vm, buffers, n_buffers, /* follow_buffer_next */
754 vlib_buffer_free_no_next_internal (vlib_main_t * vm, u32 * buffers,
757 vlib_buffer_free_inline (vm, buffers, n_buffers, /* follow_buffer_next */
761 /* Copy template packet data into buffers as they are allocated. */
762 static void __attribute__ ((unused))
763 vlib_packet_template_buffer_init (vlib_main_t * vm,
764 vlib_buffer_free_list_t * fl,
765 u32 * buffers, u32 n_buffers)
767 vlib_packet_template_t *t =
768 uword_to_pointer (fl->buffer_init_function_opaque,
769 vlib_packet_template_t *);
772 for (i = 0; i < n_buffers; i++)
774 vlib_buffer_t *b = vlib_get_buffer (vm, buffers[i]);
775 ASSERT (b->current_length == vec_len (t->packet_data));
776 clib_memcpy (vlib_buffer_get_current (b), t->packet_data,
782 vlib_packet_template_init (vlib_main_t * vm,
783 vlib_packet_template_t * t,
785 uword n_packet_data_bytes,
786 uword min_n_buffers_each_physmem_alloc,
789 vlib_buffer_main_t *bm = vm->buffer_main;
792 vlib_buffer_free_list_t *fl;
795 name = va_format (0, fmt, &va);
798 if (bm->cb.vlib_packet_template_init_cb)
799 bm->cb.vlib_packet_template_init_cb (vm, (void *) t, packet_data,
801 min_n_buffers_each_physmem_alloc,
804 vlib_worker_thread_barrier_sync (vm);
806 memset (t, 0, sizeof (t[0]));
808 vec_add (t->packet_data, packet_data, n_packet_data_bytes);
809 t->min_n_buffers_each_physmem_alloc = min_n_buffers_each_physmem_alloc;
811 t->free_list_index = vlib_buffer_create_free_list_helper
812 (vm, n_packet_data_bytes,
817 ASSERT (t->free_list_index != 0);
818 fl = vlib_buffer_get_free_list (vm, t->free_list_index);
819 fl->min_n_buffers_each_physmem_alloc = t->min_n_buffers_each_physmem_alloc;
821 fl->buffer_init_function = vlib_packet_template_buffer_init;
822 fl->buffer_init_function_opaque = pointer_to_uword (t);
824 fl->buffer_init_template.current_data = 0;
825 fl->buffer_init_template.current_length = n_packet_data_bytes;
826 fl->buffer_init_template.flags = 0;
827 fl->buffer_init_template.n_add_refs = 0;
828 vlib_worker_thread_barrier_release (vm);
832 vlib_packet_template_get_packet (vlib_main_t * vm,
833 vlib_packet_template_t * t, u32 * bi_result)
838 if (vlib_buffer_alloc (vm, &bi, 1) != 1)
843 b = vlib_get_buffer (vm, bi);
844 clib_memcpy (vlib_buffer_get_current (b),
845 t->packet_data, vec_len (t->packet_data));
846 b->current_length = vec_len (t->packet_data);
852 vlib_packet_template_get_packet_helper (vlib_main_t * vm,
853 vlib_packet_template_t * t)
855 word n = t->min_n_buffers_each_physmem_alloc;
856 word l = vec_len (t->packet_data);
860 ASSERT (vec_len (t->free_buffers) == 0);
862 vec_validate (t->free_buffers, n - 1);
863 n_alloc = vlib_buffer_alloc_from_free_list (vm, t->free_buffers,
864 n, t->free_list_index);
865 _vec_len (t->free_buffers) = n_alloc;
868 /* Append given data to end of buffer, possibly allocating new buffers. */
870 vlib_buffer_add_data (vlib_main_t * vm,
872 u32 buffer_index, void *data, u32 n_data_bytes)
874 u32 n_buffer_bytes, n_left, n_left_this_buffer, bi;
880 && 1 != vlib_buffer_alloc_from_free_list (vm, &bi, 1, free_list_index))
884 n_left = n_data_bytes;
885 n_buffer_bytes = vlib_buffer_free_list_buffer_size (vm, free_list_index);
887 b = vlib_get_buffer (vm, bi);
888 b->flags &= ~VLIB_BUFFER_TOTAL_LENGTH_VALID;
890 /* Get to the end of the chain before we try to append data... */
891 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
892 b = vlib_get_buffer (vm, b->next_buffer);
898 ASSERT (n_buffer_bytes >= b->current_length);
900 n_buffer_bytes - (b->current_data + b->current_length);
901 n = clib_min (n_left_this_buffer, n_left);
902 clib_memcpy (vlib_buffer_get_current (b) + b->current_length, d, n);
903 b->current_length += n;
910 vlib_buffer_alloc_from_free_list (vm, &b->next_buffer, 1,
914 b->flags |= VLIB_BUFFER_NEXT_PRESENT;
916 b = vlib_get_buffer (vm, b->next_buffer);
922 clib_error ("out of buffers");
927 vlib_buffer_chain_append_data_with_alloc (vlib_main_t * vm,
929 vlib_buffer_t * first,
930 vlib_buffer_t ** last,
931 void *data, u16 data_len)
933 vlib_buffer_t *l = *last;
935 vlib_buffer_free_list_buffer_size (vm, free_list_index);
937 ASSERT (n_buffer_bytes >= l->current_length + l->current_data);
940 u16 max = n_buffer_bytes - l->current_length - l->current_data;
944 vlib_buffer_alloc_from_free_list (vm, &l->next_buffer, 1,
947 *last = l = vlib_buffer_chain_buffer (vm, first, l, l->next_buffer);
948 max = n_buffer_bytes - l->current_length - l->current_data;
951 u16 len = (data_len > max) ? max : data_len;
952 clib_memcpy (vlib_buffer_get_current (l) + l->current_length,
954 vlib_buffer_chain_increase_length (first, l, len);
962 vlib_buffer_add_mem_range (vlib_main_t * vm, uword start, uword size)
964 vlib_buffer_main_t *bm = vm->buffer_main;
966 if (bm->buffer_mem_size == 0)
968 bm->buffer_mem_start = start;
969 bm->buffer_mem_size = size;
971 else if (start < bm->buffer_mem_start)
973 bm->buffer_mem_size += bm->buffer_mem_start - start;
974 bm->buffer_mem_start = start;
975 if (size > bm->buffer_mem_size)
976 bm->buffer_mem_size = size;
978 else if (start > bm->buffer_mem_start)
980 uword new_size = start - bm->buffer_mem_start + size;
981 if (new_size > bm->buffer_mem_size)
982 bm->buffer_mem_size = new_size;
985 if ((u64) bm->buffer_mem_size >
986 ((u64) 1 << (32 + CLIB_LOG2_CACHE_LINE_BYTES)))
988 clib_panic ("buffer memory size out of range!");
993 format_vlib_buffer_free_list (u8 * s, va_list * va)
995 vlib_buffer_free_list_t *f = va_arg (*va, vlib_buffer_free_list_t *);
996 u32 threadnum = va_arg (*va, u32);
997 uword bytes_alloc, bytes_free, n_free, size;
1000 return format (s, "%=7s%=30s%=12s%=12s%=12s%=12s%=12s%=12s",
1001 "Thread", "Name", "Index", "Size", "Alloc", "Free",
1004 size = sizeof (vlib_buffer_t) + f->n_data_bytes;
1005 n_free = vec_len (f->buffers);
1006 bytes_alloc = size * f->n_alloc;
1007 bytes_free = size * n_free;
1009 s = format (s, "%7d%30v%12d%12d%=12U%=12U%=12d%=12d", threadnum,
1010 f->name, f->index, f->n_data_bytes,
1011 format_memory_size, bytes_alloc,
1012 format_memory_size, bytes_free, f->n_alloc, n_free);
1017 static clib_error_t *
1018 show_buffers (vlib_main_t * vm,
1019 unformat_input_t * input, vlib_cli_command_t * cmd)
1021 vlib_buffer_main_t *bm;
1022 vlib_buffer_free_list_t *f;
1023 vlib_main_t *curr_vm;
1026 vlib_cli_output (vm, "%U", format_vlib_buffer_free_list, 0, 0);
1030 curr_vm = vlib_mains[vm_index];
1031 bm = curr_vm->buffer_main;
1034 pool_foreach (f, bm->buffer_free_list_pool, ({
1035 vlib_cli_output (vm, "%U", format_vlib_buffer_free_list, f, vm_index);
1041 while (vm_index < vec_len (vlib_mains));
1047 VLIB_CLI_COMMAND (show_buffers_command, static) = {
1048 .path = "show buffers",
1049 .short_help = "Show packet buffer allocation",
1050 .function = show_buffers,
1055 vlib_buffer_cb_init (struct vlib_main_t *vm)
1057 vlib_buffer_main_t *bm = vm->buffer_main;
1059 bm->cb.vlib_buffer_alloc_cb = &vlib_buffer_alloc_internal;
1060 bm->cb.vlib_buffer_alloc_from_free_list_cb =
1061 &vlib_buffer_alloc_from_free_list_internal;
1062 bm->cb.vlib_buffer_free_cb = &vlib_buffer_free_internal;
1063 bm->cb.vlib_buffer_free_no_next_cb = &vlib_buffer_free_no_next_internal;
1064 bm->cb.vlib_buffer_delete_free_list_cb =
1065 &vlib_buffer_delete_free_list_internal;
1066 clib_spinlock_init (&bm->buffer_known_hash_lockp);
1071 * fd.io coding-style-patch-verification: ON
1074 * eval: (c-set-style "gnu")