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_funcs.h: VLIB buffer related functions/inlines
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.
40 #ifndef included_vlib_buffer_funcs_h
41 #define included_vlib_buffer_funcs_h
43 #include <vppinfra/hash.h>
44 #include <vppinfra/fifo.h>
45 #include <vlib/buffer.h>
46 #include <vlib/physmem_funcs.h>
47 #include <vlib/main.h>
48 #include <vlib/node.h>
51 vlib buffer access methods.
55 vlib_buffer_validate (vlib_main_t * vm, vlib_buffer_t * b)
57 vlib_buffer_main_t *bm = vm->buffer_main;
58 vlib_buffer_pool_t *bp;
60 /* reference count in allocated buffer always must be 1 or higher */
61 ASSERT (b->ref_count > 0);
63 /* verify that buffer pool index is valid */
64 bp = vec_elt_at_index (bm->buffer_pools, b->buffer_pool_index);
65 ASSERT (pointer_to_uword (b) >= bp->start);
66 ASSERT (pointer_to_uword (b) < bp->start + bp->size -
67 (bp->data_size + sizeof (vlib_buffer_t)));
71 vlib_buffer_ptr_from_index (uword buffer_mem_start, u32 buffer_index,
74 offset += ((uword) buffer_index) << CLIB_LOG2_CACHE_LINE_BYTES;
75 return uword_to_pointer (buffer_mem_start + offset, vlib_buffer_t *);
78 /** \brief Translate buffer index into buffer pointer
80 @param vm - (vlib_main_t *) vlib main data structure pointer
81 @param buffer_index - (u32) buffer index
82 @return - (vlib_buffer_t *) buffer pointer
84 always_inline vlib_buffer_t *
85 vlib_get_buffer (vlib_main_t * vm, u32 buffer_index)
87 vlib_buffer_main_t *bm = vm->buffer_main;
90 b = vlib_buffer_ptr_from_index (bm->buffer_mem_start, buffer_index, 0);
91 vlib_buffer_validate (vm, b);
95 static_always_inline u32
96 vlib_buffer_get_default_data_size (vlib_main_t * vm)
98 return vm->buffer_main->default_data_size;
101 static_always_inline void
102 vlib_buffer_copy_indices (u32 * dst, u32 * src, u32 n_indices)
104 #if defined(CLIB_HAVE_VEC512)
105 while (n_indices >= 16)
107 u32x16_store_unaligned (u32x16_load_unaligned (src), dst);
114 #if defined(CLIB_HAVE_VEC256)
115 while (n_indices >= 8)
117 u32x8_store_unaligned (u32x8_load_unaligned (src), dst);
124 #if defined(CLIB_HAVE_VEC128)
125 while (n_indices >= 4)
127 u32x4_store_unaligned (u32x4_load_unaligned (src), dst);
143 STATIC_ASSERT_OFFSET_OF (vlib_buffer_t, template_end, 64);
144 static_always_inline void
145 vlib_buffer_copy_template (vlib_buffer_t * b, vlib_buffer_t * bt)
147 #if defined CLIB_HAVE_VEC512
148 b->as_u8x64[0] = bt->as_u8x64[0];
149 #elif defined (CLIB_HAVE_VEC256)
150 b->as_u8x32[0] = bt->as_u8x32[0];
151 b->as_u8x32[1] = bt->as_u8x32[1];
152 #elif defined (CLIB_HAVE_VEC128)
153 b->as_u8x16[0] = bt->as_u8x16[0];
154 b->as_u8x16[1] = bt->as_u8x16[1];
155 b->as_u8x16[2] = bt->as_u8x16[2];
156 b->as_u8x16[3] = bt->as_u8x16[3];
158 clib_memcpy_fast (b, bt, 64);
163 vlib_buffer_pool_get_default_for_numa (vlib_main_t * vm, u32 numa_node)
165 ASSERT (numa_node < VLIB_BUFFER_MAX_NUMA_NODES);
166 return vm->buffer_main->default_buffer_pool_index_for_numa[numa_node];
169 /** \brief Translate array of buffer indices into buffer pointers with offset
171 @param vm - (vlib_main_t *) vlib main data structure pointer
172 @param bi - (u32 *) array of buffer indices
173 @param b - (void **) array to store buffer pointers
174 @param count - (uword) number of elements
175 @param offset - (i32) offset applied to each pointer
177 static_always_inline void
178 vlib_get_buffers_with_offset (vlib_main_t * vm, u32 * bi, void **b, int count,
181 uword buffer_mem_start = vm->buffer_main->buffer_mem_start;
182 #ifdef CLIB_HAVE_VEC256
183 u64x4 off = u64x4_splat (buffer_mem_start + offset);
184 /* if count is not const, compiler will not unroll while loop
185 se we maintain two-in-parallel variant */
188 u64x4 b0 = u32x4_extend_to_u64x4 (u32x4_load_unaligned (bi));
189 u64x4 b1 = u32x4_extend_to_u64x4 (u32x4_load_unaligned (bi + 4));
190 /* shift and add to get vlib_buffer_t pointer */
191 u64x4_store_unaligned ((b0 << CLIB_LOG2_CACHE_LINE_BYTES) + off, b);
192 u64x4_store_unaligned ((b1 << CLIB_LOG2_CACHE_LINE_BYTES) + off, b + 4);
200 #ifdef CLIB_HAVE_VEC256
201 u64x4 b0 = u32x4_extend_to_u64x4 (u32x4_load_unaligned (bi));
202 /* shift and add to get vlib_buffer_t pointer */
203 u64x4_store_unaligned ((b0 << CLIB_LOG2_CACHE_LINE_BYTES) + off, b);
204 #elif defined (CLIB_HAVE_VEC128)
205 u64x2 off = u64x2_splat (buffer_mem_start + offset);
206 u32x4 bi4 = u32x4_load_unaligned (bi);
207 u64x2 b0 = u32x4_extend_to_u64x2 ((u32x4) bi4);
208 #if defined (__aarch64__)
209 u64x2 b1 = u32x4_extend_to_u64x2_high ((u32x4) bi4);
211 bi4 = u32x4_shuffle (bi4, 2, 3, 0, 1);
212 u64x2 b1 = u32x4_extend_to_u64x2 ((u32x4) bi4);
214 u64x2_store_unaligned ((b0 << CLIB_LOG2_CACHE_LINE_BYTES) + off, b);
215 u64x2_store_unaligned ((b1 << CLIB_LOG2_CACHE_LINE_BYTES) + off, b + 2);
217 b[0] = vlib_buffer_ptr_from_index (buffer_mem_start, bi[0], offset);
218 b[1] = vlib_buffer_ptr_from_index (buffer_mem_start, bi[1], offset);
219 b[2] = vlib_buffer_ptr_from_index (buffer_mem_start, bi[2], offset);
220 b[3] = vlib_buffer_ptr_from_index (buffer_mem_start, bi[3], offset);
228 b[0] = vlib_buffer_ptr_from_index (buffer_mem_start, bi[0], offset);
235 /** \brief Translate array of buffer indices into buffer pointers
237 @param vm - (vlib_main_t *) vlib main data structure pointer
238 @param bi - (u32 *) array of buffer indices
239 @param b - (vlib_buffer_t **) array to store buffer pointers
240 @param count - (uword) number of elements
243 static_always_inline void
244 vlib_get_buffers (vlib_main_t * vm, u32 * bi, vlib_buffer_t ** b, int count)
246 vlib_get_buffers_with_offset (vm, bi, (void **) b, count, 0);
249 /** \brief Translate buffer pointer into buffer index
251 @param vm - (vlib_main_t *) vlib main data structure pointer
252 @param p - (void *) buffer pointer
253 @return - (u32) buffer index
257 vlib_get_buffer_index (vlib_main_t * vm, void *p)
259 vlib_buffer_main_t *bm = vm->buffer_main;
260 uword offset = pointer_to_uword (p) - bm->buffer_mem_start;
261 ASSERT (pointer_to_uword (p) >= bm->buffer_mem_start);
262 ASSERT (offset < bm->buffer_mem_size);
263 ASSERT ((offset % (1 << CLIB_LOG2_CACHE_LINE_BYTES)) == 0);
264 return offset >> CLIB_LOG2_CACHE_LINE_BYTES;
267 /** \brief Translate array of buffer pointers into buffer indices with offset
269 @param vm - (vlib_main_t *) vlib main data structure pointer
270 @param b - (void **) array of buffer pointers
271 @param bi - (u32 *) array to store buffer indices
272 @param count - (uword) number of elements
273 @param offset - (i32) offset applied to each pointer
275 static_always_inline void
276 vlib_get_buffer_indices_with_offset (vlib_main_t * vm, void **b, u32 * bi,
277 uword count, i32 offset)
279 #ifdef CLIB_HAVE_VEC256
280 u32x8 mask = { 0, 2, 4, 6, 1, 3, 5, 7 };
281 u64x4 off4 = u64x4_splat (vm->buffer_main->buffer_mem_start - offset);
285 /* load 4 pointers into 256-bit register */
286 u64x4 v0 = u64x4_load_unaligned (b);
287 u64x4 v1 = u64x4_load_unaligned (b + 4);
293 v0 >>= CLIB_LOG2_CACHE_LINE_BYTES;
294 v1 >>= CLIB_LOG2_CACHE_LINE_BYTES;
296 /* permute 256-bit register so lower u32s of each buffer index are
297 * placed into lower 128-bits */
298 v2 = u32x8_permute ((u32x8) v0, mask);
299 v3 = u32x8_permute ((u32x8) v1, mask);
301 /* extract lower 128-bits and save them to the array of buffer indices */
302 u32x4_store_unaligned (u32x8_extract_lo (v2), bi);
303 u32x4_store_unaligned (u32x8_extract_lo (v3), bi + 4);
311 /* equivalent non-nector implementation */
312 bi[0] = vlib_get_buffer_index (vm, ((u8 *) b[0]) + offset);
313 bi[1] = vlib_get_buffer_index (vm, ((u8 *) b[1]) + offset);
314 bi[2] = vlib_get_buffer_index (vm, ((u8 *) b[2]) + offset);
315 bi[3] = vlib_get_buffer_index (vm, ((u8 *) b[3]) + offset);
322 bi[0] = vlib_get_buffer_index (vm, ((u8 *) b[0]) + offset);
329 /** \brief Translate array of buffer pointers into buffer indices
331 @param vm - (vlib_main_t *) vlib main data structure pointer
332 @param b - (vlib_buffer_t **) array of buffer pointers
333 @param bi - (u32 *) array to store buffer indices
334 @param count - (uword) number of elements
336 static_always_inline void
337 vlib_get_buffer_indices (vlib_main_t * vm, vlib_buffer_t ** b, u32 * bi,
340 vlib_get_buffer_indices_with_offset (vm, (void **) b, bi, count, 0);
343 /** \brief Get next buffer in buffer linklist, or zero for end of list.
345 @param vm - (vlib_main_t *) vlib main data structure pointer
346 @param b - (void *) buffer pointer
347 @return - (vlib_buffer_t *) next buffer, or NULL
349 always_inline vlib_buffer_t *
350 vlib_get_next_buffer (vlib_main_t * vm, vlib_buffer_t * b)
352 return (b->flags & VLIB_BUFFER_NEXT_PRESENT
353 ? vlib_get_buffer (vm, b->next_buffer) : 0);
356 uword vlib_buffer_length_in_chain_slow_path (vlib_main_t * vm,
357 vlib_buffer_t * b_first);
359 /** \brief Get length in bytes of the buffer chain
361 @param vm - (vlib_main_t *) vlib main data structure pointer
362 @param b - (void *) buffer pointer
363 @return - (uword) length of buffer chain
366 vlib_buffer_length_in_chain (vlib_main_t * vm, vlib_buffer_t * b)
368 uword len = b->current_length;
370 if (PREDICT_TRUE ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0))
373 if (PREDICT_TRUE (b->flags & VLIB_BUFFER_TOTAL_LENGTH_VALID))
374 return len + b->total_length_not_including_first_buffer;
376 return vlib_buffer_length_in_chain_slow_path (vm, b);
379 /** \brief Get length in bytes of the buffer index buffer chain
381 @param vm - (vlib_main_t *) vlib main data structure pointer
382 @param bi - (u32) buffer index
383 @return - (uword) length of buffer chain
386 vlib_buffer_index_length_in_chain (vlib_main_t * vm, u32 bi)
388 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
389 return vlib_buffer_length_in_chain (vm, b);
392 /** \brief Copy buffer contents to memory
394 @param vm - (vlib_main_t *) vlib main data structure pointer
395 @param buffer_index - (u32) buffer index
396 @param contents - (u8 *) memory, <strong>must be large enough</strong>
397 @return - (uword) length of buffer chain
400 vlib_buffer_contents (vlib_main_t * vm, u32 buffer_index, u8 * contents)
402 uword content_len = 0;
408 b = vlib_get_buffer (vm, buffer_index);
409 l = b->current_length;
410 clib_memcpy_fast (contents + content_len, b->data + b->current_data, l);
412 if (!(b->flags & VLIB_BUFFER_NEXT_PRESENT))
414 buffer_index = b->next_buffer;
421 vlib_buffer_get_pa (vlib_main_t * vm, vlib_buffer_t * b)
423 return vlib_physmem_get_pa (vm, b->data);
427 vlib_buffer_get_current_pa (vlib_main_t * vm, vlib_buffer_t * b)
429 return vlib_buffer_get_pa (vm, b) + b->current_data;
432 /** \brief Prefetch buffer metadata by buffer index
433 The first 64 bytes of buffer contains most header information
435 @param vm - (vlib_main_t *) vlib main data structure pointer
436 @param bi - (u32) buffer index
437 @param type - LOAD, STORE. In most cases, STORE is the right answer
439 /* Prefetch buffer header given index. */
440 #define vlib_prefetch_buffer_with_index(vm,bi,type) \
442 vlib_buffer_t * _b = vlib_get_buffer (vm, bi); \
443 vlib_prefetch_buffer_header (_b, type); \
448 /* Index is unknown. */
451 /* Index is known and free/allocated. */
452 VLIB_BUFFER_KNOWN_FREE,
453 VLIB_BUFFER_KNOWN_ALLOCATED,
454 } vlib_buffer_known_state_t;
456 void vlib_buffer_validate_alloc_free (vlib_main_t * vm, u32 * buffers,
458 vlib_buffer_known_state_t
461 always_inline vlib_buffer_known_state_t
462 vlib_buffer_is_known (vlib_main_t * vm, u32 buffer_index)
464 vlib_buffer_main_t *bm = vm->buffer_main;
466 clib_spinlock_lock (&bm->buffer_known_hash_lockp);
467 uword *p = hash_get (bm->buffer_known_hash, buffer_index);
468 clib_spinlock_unlock (&bm->buffer_known_hash_lockp);
469 return p ? p[0] : VLIB_BUFFER_UNKNOWN;
472 /* Validates sanity of a single buffer.
473 Returns format'ed vector with error message if any. */
474 u8 *vlib_validate_buffer (vlib_main_t * vm, u32 buffer_index,
477 u8 *vlib_validate_buffers (vlib_main_t * vm,
479 uword next_buffer_stride,
481 vlib_buffer_known_state_t known_state,
482 uword follow_buffer_next);
484 static_always_inline vlib_buffer_pool_t *
485 vlib_get_buffer_pool (vlib_main_t * vm, u8 buffer_pool_index)
487 vlib_buffer_main_t *bm = vm->buffer_main;
488 return vec_elt_at_index (bm->buffer_pools, buffer_pool_index);
491 static_always_inline uword
492 vlib_buffer_pool_get (vlib_main_t * vm, u8 buffer_pool_index, u32 * buffers,
495 vlib_buffer_pool_t *bp = vlib_get_buffer_pool (vm, buffer_pool_index);
498 ASSERT (bp->buffers);
500 clib_spinlock_lock (&bp->lock);
502 if (PREDICT_TRUE (n_buffers < len))
505 vlib_buffer_copy_indices (buffers, bp->buffers + len, n_buffers);
507 clib_spinlock_unlock (&bp->lock);
512 vlib_buffer_copy_indices (buffers, bp->buffers, len);
514 clib_spinlock_unlock (&bp->lock);
520 /** \brief Allocate buffers from specific pool into supplied array
522 @param vm - (vlib_main_t *) vlib main data structure pointer
523 @param buffers - (u32 * ) buffer index array
524 @param n_buffers - (u32) number of buffers requested
525 @return - (u32) number of buffers actually allocated, may be
526 less than the number requested or zero
530 vlib_buffer_alloc_from_pool (vlib_main_t * vm, u32 * buffers, u32 n_buffers,
531 u8 buffer_pool_index)
533 vlib_buffer_main_t *bm = vm->buffer_main;
534 vlib_buffer_pool_t *bp;
535 vlib_buffer_pool_thread_t *bpt;
536 u32 *src, *dst, len, n_left;
538 bp = vec_elt_at_index (bm->buffer_pools, buffer_pool_index);
539 bpt = vec_elt_at_index (bp->threads, vm->thread_index);
545 /* per-thread cache contains enough buffers */
546 if (len >= n_buffers)
548 src = bpt->cached_buffers + len - n_buffers;
549 vlib_buffer_copy_indices (dst, src, n_buffers);
550 bpt->n_cached -= n_buffers;
553 vlib_buffer_validate_alloc_free (vm, buffers, n_buffers,
554 VLIB_BUFFER_KNOWN_FREE);
558 /* alloc bigger than cache - take buffers directly from main pool */
559 if (n_buffers >= VLIB_BUFFER_POOL_PER_THREAD_CACHE_SZ)
561 n_buffers = vlib_buffer_pool_get (vm, buffer_pool_index, buffers,
565 vlib_buffer_validate_alloc_free (vm, buffers, n_buffers,
566 VLIB_BUFFER_KNOWN_FREE);
570 /* take everything available in the cache */
573 vlib_buffer_copy_indices (dst, bpt->cached_buffers, len);
579 len = round_pow2 (n_left, 32);
580 len = vlib_buffer_pool_get (vm, buffer_pool_index, bpt->cached_buffers,
586 u32 n_copy = clib_min (len, n_left);
587 src = bpt->cached_buffers + len - n_copy;
588 vlib_buffer_copy_indices (dst, src, n_copy);
589 bpt->n_cached -= n_copy;
595 /* Verify that buffers are known free. */
597 vlib_buffer_validate_alloc_free (vm, buffers, n_buffers,
598 VLIB_BUFFER_KNOWN_FREE);
603 /** \brief Allocate buffers from specific numa node into supplied array
605 @param vm - (vlib_main_t *) vlib main data structure pointer
606 @param buffers - (u32 * ) buffer index array
607 @param n_buffers - (u32) number of buffers requested
608 @param numa_node - (u32) numa node
609 @return - (u32) number of buffers actually allocated, may be
610 less than the number requested or zero
613 vlib_buffer_alloc_on_numa (vlib_main_t * vm, u32 * buffers, u32 n_buffers,
616 u8 index = vlib_buffer_pool_get_default_for_numa (vm, numa_node);
617 return vlib_buffer_alloc_from_pool (vm, buffers, n_buffers, index);
620 /** \brief Allocate buffers into supplied array
622 @param vm - (vlib_main_t *) vlib main data structure pointer
623 @param buffers - (u32 * ) buffer index array
624 @param n_buffers - (u32) number of buffers requested
625 @return - (u32) number of buffers actually allocated, may be
626 less than the number requested or zero
630 vlib_buffer_alloc (vlib_main_t * vm, u32 * buffers, u32 n_buffers)
632 return vlib_buffer_alloc_on_numa (vm, buffers, n_buffers, vm->numa_node);
635 /** \brief Allocate buffers into ring
637 @param vm - (vlib_main_t *) vlib main data structure pointer
638 @param buffers - (u32 * ) buffer index ring
639 @param start - (u32) first slot in the ring
640 @param ring_size - (u32) ring size
641 @param n_buffers - (u32) number of buffers requested
642 @return - (u32) number of buffers actually allocated, may be
643 less than the number requested or zero
646 vlib_buffer_alloc_to_ring (vlib_main_t * vm, u32 * ring, u32 start,
647 u32 ring_size, u32 n_buffers)
651 ASSERT (n_buffers <= ring_size);
653 if (PREDICT_TRUE (start + n_buffers <= ring_size))
654 return vlib_buffer_alloc (vm, ring + start, n_buffers);
656 n_alloc = vlib_buffer_alloc (vm, ring + start, ring_size - start);
658 if (PREDICT_TRUE (n_alloc == ring_size - start))
659 n_alloc += vlib_buffer_alloc (vm, ring, n_buffers - n_alloc);
664 /** \brief Allocate buffers into ring from specific buffer pool
666 @param vm - (vlib_main_t *) vlib main data structure pointer
667 @param buffers - (u32 * ) buffer index ring
668 @param start - (u32) first slot in the ring
669 @param ring_size - (u32) ring size
670 @param n_buffers - (u32) number of buffers requested
671 @return - (u32) number of buffers actually allocated, may be
672 less than the number requested or zero
675 vlib_buffer_alloc_to_ring_from_pool (vlib_main_t * vm, u32 * ring, u32 start,
676 u32 ring_size, u32 n_buffers,
677 u8 buffer_pool_index)
681 ASSERT (n_buffers <= ring_size);
683 if (PREDICT_TRUE (start + n_buffers <= ring_size))
684 return vlib_buffer_alloc_from_pool (vm, ring + start, n_buffers,
687 n_alloc = vlib_buffer_alloc_from_pool (vm, ring + start, ring_size - start,
690 if (PREDICT_TRUE (n_alloc == ring_size - start))
691 n_alloc += vlib_buffer_alloc_from_pool (vm, ring, n_buffers - n_alloc,
697 static_always_inline void
698 vlib_buffer_pool_put (vlib_main_t * vm, u8 buffer_pool_index,
699 u32 * buffers, u32 n_buffers)
701 vlib_buffer_pool_t *bp = vlib_get_buffer_pool (vm, buffer_pool_index);
702 vlib_buffer_pool_thread_t *bpt = vec_elt_at_index (bp->threads,
704 u32 n_cached, n_empty;
707 vlib_buffer_validate_alloc_free (vm, buffers, n_buffers,
708 VLIB_BUFFER_KNOWN_ALLOCATED);
710 n_cached = bpt->n_cached;
711 n_empty = VLIB_BUFFER_POOL_PER_THREAD_CACHE_SZ - n_cached;
712 if (n_buffers <= n_empty)
714 vlib_buffer_copy_indices (bpt->cached_buffers + n_cached,
716 bpt->n_cached = n_cached + n_buffers;
720 vlib_buffer_copy_indices (bpt->cached_buffers + n_cached,
721 buffers + n_buffers - n_empty, n_empty);
722 bpt->n_cached = VLIB_BUFFER_POOL_PER_THREAD_CACHE_SZ;
724 clib_spinlock_lock (&bp->lock);
725 vlib_buffer_copy_indices (bp->buffers + bp->n_avail, buffers,
726 n_buffers - n_empty);
727 bp->n_avail += n_buffers - n_empty;
728 clib_spinlock_unlock (&bp->lock);
731 static_always_inline void
732 vlib_buffer_free_inline (vlib_main_t * vm, u32 * buffers, u32 n_buffers,
735 const int queue_size = 128;
736 vlib_buffer_pool_t *bp = 0;
737 u8 buffer_pool_index = ~0;
738 u32 n_queue = 0, queue[queue_size + 4];
739 vlib_buffer_t bt = { };
740 #if defined(CLIB_HAVE_VEC128)
741 vlib_buffer_t bpi_mask = {.buffer_pool_index = ~0 };
742 vlib_buffer_t bpi_vec = {.buffer_pool_index = ~0 };
743 vlib_buffer_t flags_refs_mask = {
744 .flags = VLIB_BUFFER_NEXT_PRESENT,
752 u32 bi, sum = 0, flags, next;
757 vlib_get_buffers (vm, buffers, b, 4);
758 vlib_get_buffers (vm, buffers + 8, b + 4, 4);
760 vlib_prefetch_buffer_header (b[4], LOAD);
761 vlib_prefetch_buffer_header (b[5], LOAD);
762 vlib_prefetch_buffer_header (b[6], LOAD);
763 vlib_prefetch_buffer_header (b[7], LOAD);
765 #if defined(CLIB_HAVE_VEC128)
766 u8x16 p0, p1, p2, p3, r;
767 p0 = u8x16_load_unaligned (b[0]);
768 p1 = u8x16_load_unaligned (b[1]);
769 p2 = u8x16_load_unaligned (b[2]);
770 p3 = u8x16_load_unaligned (b[3]);
772 r = p0 ^ bpi_vec.as_u8x16[0];
773 r |= p1 ^ bpi_vec.as_u8x16[0];
774 r |= p2 ^ bpi_vec.as_u8x16[0];
775 r |= p3 ^ bpi_vec.as_u8x16[0];
776 r &= bpi_mask.as_u8x16[0];
777 r |= (p0 | p1 | p2 | p3) & flags_refs_mask.as_u8x16[0];
779 sum = !u8x16_is_all_zero (r);
785 sum &= VLIB_BUFFER_NEXT_PRESENT;
786 sum += b[0]->ref_count - 1;
787 sum += b[1]->ref_count - 1;
788 sum += b[2]->ref_count - 1;
789 sum += b[3]->ref_count - 1;
790 sum |= b[0]->buffer_pool_index ^ buffer_pool_index;
791 sum |= b[1]->buffer_pool_index ^ buffer_pool_index;
792 sum |= b[2]->buffer_pool_index ^ buffer_pool_index;
793 sum |= b[3]->buffer_pool_index ^ buffer_pool_index;
799 vlib_buffer_copy_indices (queue + n_queue, buffers, 4);
800 vlib_buffer_copy_template (b[0], &bt);
801 vlib_buffer_copy_template (b[1], &bt);
802 vlib_buffer_copy_template (b[2], &bt);
803 vlib_buffer_copy_template (b[3], &bt);
806 vlib_buffer_validate (vm, b[0]);
807 vlib_buffer_validate (vm, b[1]);
808 vlib_buffer_validate (vm, b[2]);
809 vlib_buffer_validate (vm, b[3]);
811 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[0]);
812 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[1]);
813 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[2]);
814 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[3]);
816 if (n_queue >= queue_size)
818 vlib_buffer_pool_put (vm, buffer_pool_index, queue, n_queue);
829 b[0] = vlib_get_buffer (vm, bi);
831 next = b[0]->next_buffer;
833 if (PREDICT_FALSE (buffer_pool_index != b[0]->buffer_pool_index))
838 vlib_buffer_pool_put (vm, buffer_pool_index, queue, n_queue);
842 buffer_pool_index = b[0]->buffer_pool_index;
843 #if defined(CLIB_HAVE_VEC128)
844 bpi_vec.buffer_pool_index = buffer_pool_index;
846 bp = vlib_get_buffer_pool (vm, buffer_pool_index);
847 vlib_buffer_copy_template (&bt, &bp->buffer_template);
850 vlib_buffer_validate (vm, b[0]);
852 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[0]);
854 if (clib_atomic_sub_fetch (&b[0]->ref_count, 1) == 0)
856 vlib_buffer_copy_template (b[0], &bt);
857 queue[n_queue++] = bi;
860 if (n_queue == queue_size)
862 vlib_buffer_pool_put (vm, buffer_pool_index, queue, queue_size);
866 if (maybe_next && (flags & VLIB_BUFFER_NEXT_PRESENT))
877 vlib_buffer_pool_put (vm, buffer_pool_index, queue, n_queue);
881 /** \brief Free buffers
882 Frees the entire buffer chain for each buffer
884 @param vm - (vlib_main_t *) vlib main data structure pointer
885 @param buffers - (u32 * ) buffer index array
886 @param n_buffers - (u32) number of buffers to free
890 vlib_buffer_free (vlib_main_t * vm,
891 /* pointer to first buffer */
893 /* number of buffers to free */
896 vlib_buffer_free_inline (vm, buffers, n_buffers, /* maybe next */ 1);
899 /** \brief Free buffers, does not free the buffer chain for each buffer
901 @param vm - (vlib_main_t *) vlib main data structure pointer
902 @param buffers - (u32 * ) buffer index array
903 @param n_buffers - (u32) number of buffers to free
907 vlib_buffer_free_no_next (vlib_main_t * vm,
908 /* pointer to first buffer */
910 /* number of buffers to free */
913 vlib_buffer_free_inline (vm, buffers, n_buffers, /* maybe next */ 0);
916 /** \brief Free one buffer
917 Shorthand to free a single buffer chain.
919 @param vm - (vlib_main_t *) vlib main data structure pointer
920 @param buffer_index - (u32) buffer index to free
923 vlib_buffer_free_one (vlib_main_t * vm, u32 buffer_index)
925 vlib_buffer_free_inline (vm, &buffer_index, 1, /* maybe next */ 1);
928 /** \brief Free buffers from ring
930 @param vm - (vlib_main_t *) vlib main data structure pointer
931 @param buffers - (u32 * ) buffer index ring
932 @param start - (u32) first slot in the ring
933 @param ring_size - (u32) ring size
934 @param n_buffers - (u32) number of buffers
937 vlib_buffer_free_from_ring (vlib_main_t * vm, u32 * ring, u32 start,
938 u32 ring_size, u32 n_buffers)
940 ASSERT (n_buffers <= ring_size);
942 if (PREDICT_TRUE (start + n_buffers <= ring_size))
944 vlib_buffer_free (vm, ring + start, n_buffers);
948 vlib_buffer_free (vm, ring + start, ring_size - start);
949 vlib_buffer_free (vm, ring, n_buffers - (ring_size - start));
953 /** \brief Free buffers from ring without freeing tail buffers
955 @param vm - (vlib_main_t *) vlib main data structure pointer
956 @param buffers - (u32 * ) buffer index ring
957 @param start - (u32) first slot in the ring
958 @param ring_size - (u32) ring size
959 @param n_buffers - (u32) number of buffers
962 vlib_buffer_free_from_ring_no_next (vlib_main_t * vm, u32 * ring, u32 start,
963 u32 ring_size, u32 n_buffers)
965 ASSERT (n_buffers <= ring_size);
967 if (PREDICT_TRUE (start + n_buffers <= ring_size))
969 vlib_buffer_free_no_next (vm, ring + start, n_buffers);
973 vlib_buffer_free_no_next (vm, ring + start, ring_size - start);
974 vlib_buffer_free_no_next (vm, ring, n_buffers - (ring_size - start));
978 /* Append given data to end of buffer, possibly allocating new buffers. */
979 int vlib_buffer_add_data (vlib_main_t * vm, u32 * buffer_index, void *data,
982 /* Define vlib_buffer and vnet_buffer flags bits preserved for copy/clone */
983 #define VLIB_BUFFER_COPY_CLONE_FLAGS_MASK \
984 (VLIB_BUFFER_NEXT_PRESENT | VLIB_BUFFER_TOTAL_LENGTH_VALID | \
985 VLIB_BUFFER_IS_TRACED | ~VLIB_BUFFER_FLAGS_ALL)
987 /* duplicate all buffers in chain */
988 always_inline vlib_buffer_t *
989 vlib_buffer_copy (vlib_main_t * vm, vlib_buffer_t * b)
991 vlib_buffer_t *s, *d, *fd;
992 uword n_alloc, n_buffers = 1;
993 u32 flag_mask = VLIB_BUFFER_COPY_CLONE_FLAGS_MASK;
997 while (s->flags & VLIB_BUFFER_NEXT_PRESENT)
1000 s = vlib_get_buffer (vm, s->next_buffer);
1002 u32 new_buffers[n_buffers];
1004 n_alloc = vlib_buffer_alloc (vm, new_buffers, n_buffers);
1006 /* No guarantee that we'll get all the buffers we asked for */
1007 if (PREDICT_FALSE (n_alloc < n_buffers))
1010 vlib_buffer_free (vm, new_buffers, n_alloc);
1016 fd = d = vlib_get_buffer (vm, new_buffers[0]);
1017 d->current_data = s->current_data;
1018 d->current_length = s->current_length;
1019 d->flags = s->flags & flag_mask;
1020 d->trace_handle = s->trace_handle;
1021 d->total_length_not_including_first_buffer =
1022 s->total_length_not_including_first_buffer;
1023 clib_memcpy_fast (d->opaque, s->opaque, sizeof (s->opaque));
1024 clib_memcpy_fast (d->opaque2, s->opaque2, sizeof (s->opaque2));
1025 clib_memcpy_fast (vlib_buffer_get_current (d),
1026 vlib_buffer_get_current (s), s->current_length);
1029 for (i = 1; i < n_buffers; i++)
1032 d->next_buffer = new_buffers[i];
1034 s = vlib_get_buffer (vm, s->next_buffer);
1035 d = vlib_get_buffer (vm, new_buffers[i]);
1036 d->current_data = s->current_data;
1037 d->current_length = s->current_length;
1038 clib_memcpy_fast (vlib_buffer_get_current (d),
1039 vlib_buffer_get_current (s), s->current_length);
1040 d->flags = s->flags & flag_mask;
1046 /* duplicate first buffer in chain */
1047 always_inline vlib_buffer_t *
1048 vlib_buffer_copy_no_chain (vlib_main_t * vm, vlib_buffer_t * b, u32 * di)
1052 if ((vlib_buffer_alloc (vm, di, 1)) != 1)
1055 d = vlib_get_buffer (vm, *di);
1057 d->current_data = b->current_data;
1058 d->current_length = b->current_length;
1059 clib_memcpy_fast (d->opaque, b->opaque, sizeof (b->opaque));
1060 clib_memcpy_fast (d->opaque2, b->opaque2, sizeof (b->opaque2));
1061 clib_memcpy_fast (vlib_buffer_get_current (d),
1062 vlib_buffer_get_current (b), b->current_length);
1067 /* \brief Move packet from current position to offset position in buffer.
1068 Only work for small packet using one buffer with room to fit the move
1069 @param vm - (vlib_main_t *) vlib main data structure pointer
1070 @param b - (vlib_buffer_t *) pointer to buffer
1071 @param offset - (i16) position to move the packet in buffer
1074 vlib_buffer_move (vlib_main_t * vm, vlib_buffer_t * b, i16 offset)
1076 ASSERT ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0);
1077 ASSERT (offset + VLIB_BUFFER_PRE_DATA_SIZE >= 0);
1078 ASSERT (offset + b->current_length <
1079 vlib_buffer_get_default_data_size (vm));
1081 u8 *source = vlib_buffer_get_current (b);
1082 b->current_data = offset;
1083 u8 *destination = vlib_buffer_get_current (b);
1084 u16 length = b->current_length;
1086 if (source + length <= destination) /* no overlap */
1087 clib_memcpy_fast (destination, source, length);
1089 memmove (destination, source, length);
1092 /** \brief Create a maximum of 256 clones of buffer and store them
1093 in the supplied array
1095 @param vm - (vlib_main_t *) vlib main data structure pointer
1096 @param src_buffer - (u32) source buffer index
1097 @param buffers - (u32 * ) buffer index array
1098 @param n_buffers - (u16) number of buffer clones requested (<=256)
1099 @param head_end_offset - (u16) offset relative to current position
1100 where packet head ends
1101 @param offset - (i16) copy packet head at current position if 0,
1102 else at offset position to change headroom space as specified
1103 @return - (u16) number of buffers actually cloned, may be
1104 less than the number requested or zero
1107 vlib_buffer_clone_256 (vlib_main_t * vm, u32 src_buffer, u32 * buffers,
1108 u16 n_buffers, u16 head_end_offset, i16 offset)
1111 vlib_buffer_t *s = vlib_get_buffer (vm, src_buffer);
1113 ASSERT (s->ref_count == 1);
1115 ASSERT (n_buffers <= 256);
1116 ASSERT (offset + VLIB_BUFFER_PRE_DATA_SIZE >= 0);
1117 ASSERT ((offset + head_end_offset) <
1118 vlib_buffer_get_default_data_size (vm));
1120 if (s->current_length <= head_end_offset + CLIB_CACHE_LINE_BYTES * 2)
1122 buffers[0] = src_buffer;
1124 vlib_buffer_move (vm, s, offset);
1126 for (i = 1; i < n_buffers; i++)
1129 d = vlib_buffer_copy (vm, s);
1132 buffers[i] = vlib_get_buffer_index (vm, d);
1138 if (PREDICT_FALSE ((n_buffers == 1) && (offset == 0)))
1140 buffers[0] = src_buffer;
1144 n_buffers = vlib_buffer_alloc_from_pool (vm, buffers, n_buffers,
1145 s->buffer_pool_index);
1147 for (i = 0; i < n_buffers; i++)
1149 vlib_buffer_t *d = vlib_get_buffer (vm, buffers[i]);
1151 d->current_data = offset;
1153 d->current_data = s->current_data;
1155 d->current_length = head_end_offset;
1156 ASSERT (d->buffer_pool_index == s->buffer_pool_index);
1158 d->total_length_not_including_first_buffer = s->current_length -
1160 if (PREDICT_FALSE (s->flags & VLIB_BUFFER_NEXT_PRESENT))
1162 d->total_length_not_including_first_buffer +=
1163 s->total_length_not_including_first_buffer;
1165 d->flags = (s->flags & VLIB_BUFFER_COPY_CLONE_FLAGS_MASK) |
1166 VLIB_BUFFER_NEXT_PRESENT;
1167 d->trace_handle = s->trace_handle;
1168 clib_memcpy_fast (d->opaque, s->opaque, sizeof (s->opaque));
1169 clib_memcpy_fast (d->opaque2, s->opaque2, sizeof (s->opaque2));
1170 clib_memcpy_fast (vlib_buffer_get_current (d),
1171 vlib_buffer_get_current (s), head_end_offset);
1172 d->next_buffer = src_buffer;
1174 vlib_buffer_advance (s, head_end_offset);
1175 s->ref_count = n_buffers;
1176 while (s->flags & VLIB_BUFFER_NEXT_PRESENT)
1178 s = vlib_get_buffer (vm, s->next_buffer);
1179 s->ref_count = n_buffers;
1185 /** \brief Create multiple clones of buffer and store them
1186 in the supplied array
1188 @param vm - (vlib_main_t *) vlib main data structure pointer
1189 @param src_buffer - (u32) source buffer index
1190 @param buffers - (u32 * ) buffer index array
1191 @param n_buffers - (u16) number of buffer clones requested (<=256)
1192 @param head_end_offset - (u16) offset relative to current position
1193 where packet head ends
1194 @param offset - (i16) copy packet head at current position if 0,
1195 else at offset position to change headroom space as specified
1196 @return - (u16) number of buffers actually cloned, may be
1197 less than the number requested or zero
1200 vlib_buffer_clone_at_offset (vlib_main_t * vm, u32 src_buffer, u32 * buffers,
1201 u16 n_buffers, u16 head_end_offset, i16 offset)
1203 vlib_buffer_t *s = vlib_get_buffer (vm, src_buffer);
1206 while (n_buffers > 256)
1208 vlib_buffer_t *copy;
1209 copy = vlib_buffer_copy (vm, s);
1210 n_cloned += vlib_buffer_clone_256 (vm,
1211 vlib_get_buffer_index (vm, copy),
1212 (buffers + n_cloned),
1213 256, head_end_offset, offset);
1216 n_cloned += vlib_buffer_clone_256 (vm, src_buffer,
1218 n_buffers, head_end_offset, offset);
1223 /** \brief Create multiple clones of buffer and store them
1224 in the supplied array
1226 @param vm - (vlib_main_t *) vlib main data structure pointer
1227 @param src_buffer - (u32) source buffer index
1228 @param buffers - (u32 * ) buffer index array
1229 @param n_buffers - (u16) number of buffer clones requested (<=256)
1230 @param head_end_offset - (u16) offset relative to current position
1231 where packet head ends
1232 @return - (u16) number of buffers actually cloned, may be
1233 less than the number requested or zero
1236 vlib_buffer_clone (vlib_main_t * vm, u32 src_buffer, u32 * buffers,
1237 u16 n_buffers, u16 head_end_offset)
1239 return vlib_buffer_clone_at_offset (vm, src_buffer, buffers, n_buffers,
1240 head_end_offset, 0);
1243 /** \brief Attach cloned tail to the buffer
1245 @param vm - (vlib_main_t *) vlib main data structure pointer
1246 @param head - (vlib_buffer_t *) head buffer
1247 @param tail - (Vlib buffer_t *) tail buffer to clone and attach to head
1251 vlib_buffer_attach_clone (vlib_main_t * vm, vlib_buffer_t * head,
1252 vlib_buffer_t * tail)
1254 ASSERT ((head->flags & VLIB_BUFFER_NEXT_PRESENT) == 0);
1255 ASSERT (head->buffer_pool_index == tail->buffer_pool_index);
1257 head->flags |= VLIB_BUFFER_NEXT_PRESENT;
1258 head->flags &= ~VLIB_BUFFER_TOTAL_LENGTH_VALID;
1259 head->flags &= ~VLIB_BUFFER_EXT_HDR_VALID;
1260 head->flags |= (tail->flags & VLIB_BUFFER_TOTAL_LENGTH_VALID);
1261 head->next_buffer = vlib_get_buffer_index (vm, tail);
1262 head->total_length_not_including_first_buffer = tail->current_length +
1263 tail->total_length_not_including_first_buffer;
1266 clib_atomic_add_fetch (&tail->ref_count, 1);
1268 if (tail->flags & VLIB_BUFFER_NEXT_PRESENT)
1270 tail = vlib_get_buffer (vm, tail->next_buffer);
1275 /* Initializes the buffer as an empty packet with no chained buffers. */
1277 vlib_buffer_chain_init (vlib_buffer_t * first)
1279 first->total_length_not_including_first_buffer = 0;
1280 first->current_length = 0;
1281 first->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
1282 first->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
1285 /* The provided next_bi buffer index is appended to the end of the packet. */
1286 always_inline vlib_buffer_t *
1287 vlib_buffer_chain_buffer (vlib_main_t * vm, vlib_buffer_t * last, u32 next_bi)
1289 vlib_buffer_t *next_buffer = vlib_get_buffer (vm, next_bi);
1290 last->next_buffer = next_bi;
1291 last->flags |= VLIB_BUFFER_NEXT_PRESENT;
1292 next_buffer->current_length = 0;
1293 next_buffer->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
1297 /* Increases or decreases the packet length.
1298 * It does not allocate or deallocate new buffers.
1299 * Therefore, the added length must be compatible
1300 * with the last buffer. */
1302 vlib_buffer_chain_increase_length (vlib_buffer_t * first,
1303 vlib_buffer_t * last, i32 len)
1305 last->current_length += len;
1307 first->total_length_not_including_first_buffer += len;
1310 /* Copy data to the end of the packet and increases its length.
1311 * It does not allocate new buffers.
1312 * Returns the number of copied bytes. */
1314 vlib_buffer_chain_append_data (vlib_main_t * vm,
1315 vlib_buffer_t * first,
1316 vlib_buffer_t * last, void *data, u16 data_len)
1318 u32 n_buffer_bytes = vlib_buffer_get_default_data_size (vm);
1319 ASSERT (n_buffer_bytes >= last->current_length + last->current_data);
1320 u16 len = clib_min (data_len,
1321 n_buffer_bytes - last->current_length -
1322 last->current_data);
1323 clib_memcpy_fast (vlib_buffer_get_current (last) + last->current_length,
1325 vlib_buffer_chain_increase_length (first, last, len);
1329 /* Copy data to the end of the packet and increases its length.
1330 * Allocates additional buffers from the free list if necessary.
1331 * Returns the number of copied bytes.
1332 * 'last' value is modified whenever new buffers are allocated and
1333 * chained and points to the last buffer in the chain. */
1335 vlib_buffer_chain_append_data_with_alloc (vlib_main_t * vm,
1336 vlib_buffer_t * first,
1337 vlib_buffer_t ** last, void *data,
1339 void vlib_buffer_chain_validate (vlib_main_t * vm, vlib_buffer_t * first);
1341 format_function_t format_vlib_buffer, format_vlib_buffer_and_data,
1342 format_vlib_buffer_contents, format_vlib_buffer_no_chain;
1346 /* Vector of packet data. */
1349 /* Number of buffers to allocate in each call to allocator. */
1350 u32 min_n_buffers_each_alloc;
1353 } vlib_packet_template_t;
1355 void vlib_packet_template_init (vlib_main_t * vm,
1356 vlib_packet_template_t * t,
1358 uword n_packet_data_bytes,
1359 uword min_n_buffers_each_alloc,
1362 void *vlib_packet_template_get_packet (vlib_main_t * vm,
1363 vlib_packet_template_t * t,
1367 vlib_packet_template_free (vlib_main_t * vm, vlib_packet_template_t * t)
1369 vec_free (t->packet_data);
1373 vlib_buffer_space_left_at_end (vlib_main_t * vm, vlib_buffer_t * b)
1375 return b->data + vlib_buffer_get_default_data_size (vm) -
1376 ((u8 *) vlib_buffer_get_current (b) + b->current_length);
1380 vlib_buffer_chain_linearize (vlib_main_t * vm, vlib_buffer_t * b)
1382 vlib_buffer_t *db = b, *sb, *first = b;
1384 u32 bytes_left = 0, data_size;
1385 u16 src_left, dst_left, n_buffers = 1;
1389 if (PREDICT_TRUE ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0))
1392 data_size = vlib_buffer_get_default_data_size (vm);
1394 dst_left = vlib_buffer_space_left_at_end (vm, b);
1396 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
1398 b = vlib_get_buffer (vm, b->next_buffer);
1399 if (b->ref_count > 1)
1401 bytes_left += b->current_length;
1405 /* if buffer is cloned, create completely new chain - unless everything fits
1406 * into one buffer */
1407 if (is_cloned && bytes_left >= dst_left)
1410 u32 space_needed = bytes_left - dst_left;
1413 if (vlib_buffer_alloc (vm, &tail, 1) == 0)
1418 b = vlib_get_buffer (vm, tail);
1420 while (len < space_needed)
1423 if (vlib_buffer_alloc (vm, &bi, 1) == 0)
1425 vlib_buffer_free_one (vm, tail);
1428 b->flags = VLIB_BUFFER_NEXT_PRESENT;
1429 b->next_buffer = bi;
1430 b = vlib_get_buffer (vm, bi);
1434 sb = vlib_get_buffer (vm, first->next_buffer);
1435 to_free = first->next_buffer;
1436 first->next_buffer = tail;
1439 sb = vlib_get_buffer (vm, first->next_buffer);
1441 src_left = sb->current_length;
1442 sp = vlib_buffer_get_current (sb);
1443 dp = vlib_buffer_get_tail (db);
1451 db->current_length = dp - (u8 *) vlib_buffer_get_current (db);
1452 ASSERT (db->flags & VLIB_BUFFER_NEXT_PRESENT);
1453 db = vlib_get_buffer (vm, db->next_buffer);
1454 dst_left = data_size;
1455 if (db->current_data > 0)
1457 db->current_data = 0;
1461 dst_left += -db->current_data;
1463 dp = vlib_buffer_get_current (db);
1466 while (src_left == 0)
1468 ASSERT (sb->flags & VLIB_BUFFER_NEXT_PRESENT);
1469 sb = vlib_get_buffer (vm, sb->next_buffer);
1470 src_left = sb->current_length;
1471 sp = vlib_buffer_get_current (sb);
1474 bytes_to_copy = clib_min (dst_left, src_left);
1479 bytes_to_copy = clib_min (bytes_to_copy, sp - dp);
1481 clib_memcpy_fast (dp, sp, bytes_to_copy);
1484 src_left -= bytes_to_copy;
1485 dst_left -= bytes_to_copy;
1486 dp += bytes_to_copy;
1487 sp += bytes_to_copy;
1488 bytes_left -= bytes_to_copy;
1491 db->current_data = 0;
1492 db->current_length = dp - (u8 *) vlib_buffer_get_current (db);
1494 if (is_cloned && to_free)
1495 vlib_buffer_free_one (vm, to_free);
1498 if (db->flags & VLIB_BUFFER_NEXT_PRESENT)
1499 vlib_buffer_free_one (vm, db->next_buffer);
1500 db->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
1503 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
1505 b = vlib_get_buffer (vm, b->next_buffer);
1510 first->flags &= ~VLIB_BUFFER_TOTAL_LENGTH_VALID;
1515 #endif /* included_vlib_buffer_funcs_h */
1518 * fd.io coding-style-patch-verification: ON
1521 * eval: (c-set-style "gnu")