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);
144 vlib_buffer_copy_indices_from_ring (u32 * dst, u32 * ring, u32 start,
145 u32 ring_size, u32 n_buffers)
147 ASSERT (n_buffers <= ring_size);
149 if (PREDICT_TRUE (start + n_buffers <= ring_size))
151 vlib_buffer_copy_indices (dst, ring + start, n_buffers);
155 u32 n = ring_size - start;
156 vlib_buffer_copy_indices (dst, ring + start, n);
157 vlib_buffer_copy_indices (dst + n, ring, n_buffers - n);
161 STATIC_ASSERT_OFFSET_OF (vlib_buffer_t, template_end, 64);
162 static_always_inline void
163 vlib_buffer_copy_template (vlib_buffer_t * b, vlib_buffer_t * bt)
165 #if defined CLIB_HAVE_VEC512
166 b->as_u8x64[0] = bt->as_u8x64[0];
167 #elif defined (CLIB_HAVE_VEC256)
168 b->as_u8x32[0] = bt->as_u8x32[0];
169 b->as_u8x32[1] = bt->as_u8x32[1];
170 #elif defined (CLIB_HAVE_VEC128)
171 b->as_u8x16[0] = bt->as_u8x16[0];
172 b->as_u8x16[1] = bt->as_u8x16[1];
173 b->as_u8x16[2] = bt->as_u8x16[2];
174 b->as_u8x16[3] = bt->as_u8x16[3];
176 clib_memcpy_fast (b, bt, 64);
181 vlib_buffer_pool_get_default_for_numa (vlib_main_t * vm, u32 numa_node)
183 ASSERT (numa_node < VLIB_BUFFER_MAX_NUMA_NODES);
184 return vm->buffer_main->default_buffer_pool_index_for_numa[numa_node];
187 /** \brief Translate array of buffer indices into buffer pointers with offset
189 @param vm - (vlib_main_t *) vlib main data structure pointer
190 @param bi - (u32 *) array of buffer indices
191 @param b - (void **) array to store buffer pointers
192 @param count - (uword) number of elements
193 @param offset - (i32) offset applied to each pointer
195 static_always_inline void
196 vlib_get_buffers_with_offset (vlib_main_t * vm, u32 * bi, void **b, int count,
199 uword buffer_mem_start = vm->buffer_main->buffer_mem_start;
200 #ifdef CLIB_HAVE_VEC256
201 u64x4 off = u64x4_splat (buffer_mem_start + offset);
202 /* if count is not const, compiler will not unroll while loop
203 se we maintain two-in-parallel variant */
206 u64x4 b0 = u32x4_extend_to_u64x4 (u32x4_load_unaligned (bi));
207 u64x4 b1 = u32x4_extend_to_u64x4 (u32x4_load_unaligned (bi + 4));
208 /* shift and add to get vlib_buffer_t pointer */
209 u64x4_store_unaligned ((b0 << CLIB_LOG2_CACHE_LINE_BYTES) + off, b);
210 u64x4_store_unaligned ((b1 << CLIB_LOG2_CACHE_LINE_BYTES) + off, b + 4);
218 #ifdef CLIB_HAVE_VEC256
219 u64x4 b0 = u32x4_extend_to_u64x4 (u32x4_load_unaligned (bi));
220 /* shift and add to get vlib_buffer_t pointer */
221 u64x4_store_unaligned ((b0 << CLIB_LOG2_CACHE_LINE_BYTES) + off, b);
222 #elif defined (CLIB_HAVE_VEC128)
223 u64x2 off = u64x2_splat (buffer_mem_start + offset);
224 u32x4 bi4 = u32x4_load_unaligned (bi);
225 u64x2 b0 = u32x4_extend_to_u64x2 ((u32x4) bi4);
226 #if defined (__aarch64__)
227 u64x2 b1 = u32x4_extend_to_u64x2_high ((u32x4) bi4);
229 bi4 = u32x4_shuffle (bi4, 2, 3, 0, 1);
230 u64x2 b1 = u32x4_extend_to_u64x2 ((u32x4) bi4);
232 u64x2_store_unaligned ((b0 << CLIB_LOG2_CACHE_LINE_BYTES) + off, b);
233 u64x2_store_unaligned ((b1 << CLIB_LOG2_CACHE_LINE_BYTES) + off, b + 2);
235 b[0] = vlib_buffer_ptr_from_index (buffer_mem_start, bi[0], offset);
236 b[1] = vlib_buffer_ptr_from_index (buffer_mem_start, bi[1], offset);
237 b[2] = vlib_buffer_ptr_from_index (buffer_mem_start, bi[2], offset);
238 b[3] = vlib_buffer_ptr_from_index (buffer_mem_start, bi[3], offset);
246 b[0] = vlib_buffer_ptr_from_index (buffer_mem_start, bi[0], offset);
253 /** \brief Translate array of buffer indices into buffer pointers
255 @param vm - (vlib_main_t *) vlib main data structure pointer
256 @param bi - (u32 *) array of buffer indices
257 @param b - (vlib_buffer_t **) array to store buffer pointers
258 @param count - (uword) number of elements
261 static_always_inline void
262 vlib_get_buffers (vlib_main_t * vm, u32 * bi, vlib_buffer_t ** b, int count)
264 vlib_get_buffers_with_offset (vm, bi, (void **) b, count, 0);
267 /** \brief Translate buffer pointer into buffer index
269 @param vm - (vlib_main_t *) vlib main data structure pointer
270 @param p - (void *) buffer pointer
271 @return - (u32) buffer index
275 vlib_get_buffer_index (vlib_main_t * vm, void *p)
277 vlib_buffer_main_t *bm = vm->buffer_main;
278 uword offset = pointer_to_uword (p) - bm->buffer_mem_start;
279 ASSERT (pointer_to_uword (p) >= bm->buffer_mem_start);
280 ASSERT (offset < bm->buffer_mem_size);
281 ASSERT ((offset % (1 << CLIB_LOG2_CACHE_LINE_BYTES)) == 0);
282 return offset >> CLIB_LOG2_CACHE_LINE_BYTES;
285 /** \brief Translate array of buffer pointers into buffer indices with offset
287 @param vm - (vlib_main_t *) vlib main data structure pointer
288 @param b - (void **) array of buffer pointers
289 @param bi - (u32 *) array to store buffer indices
290 @param count - (uword) number of elements
291 @param offset - (i32) offset applied to each pointer
293 static_always_inline void
294 vlib_get_buffer_indices_with_offset (vlib_main_t * vm, void **b, u32 * bi,
295 uword count, i32 offset)
297 #ifdef CLIB_HAVE_VEC256
298 u32x8 mask = { 0, 2, 4, 6, 1, 3, 5, 7 };
299 u64x4 off4 = u64x4_splat (vm->buffer_main->buffer_mem_start - offset);
303 /* load 4 pointers into 256-bit register */
304 u64x4 v0 = u64x4_load_unaligned (b);
305 u64x4 v1 = u64x4_load_unaligned (b + 4);
311 v0 >>= CLIB_LOG2_CACHE_LINE_BYTES;
312 v1 >>= CLIB_LOG2_CACHE_LINE_BYTES;
314 /* permute 256-bit register so lower u32s of each buffer index are
315 * placed into lower 128-bits */
316 v2 = u32x8_permute ((u32x8) v0, mask);
317 v3 = u32x8_permute ((u32x8) v1, mask);
319 /* extract lower 128-bits and save them to the array of buffer indices */
320 u32x4_store_unaligned (u32x8_extract_lo (v2), bi);
321 u32x4_store_unaligned (u32x8_extract_lo (v3), bi + 4);
329 /* equivalent non-nector implementation */
330 bi[0] = vlib_get_buffer_index (vm, ((u8 *) b[0]) + offset);
331 bi[1] = vlib_get_buffer_index (vm, ((u8 *) b[1]) + offset);
332 bi[2] = vlib_get_buffer_index (vm, ((u8 *) b[2]) + offset);
333 bi[3] = vlib_get_buffer_index (vm, ((u8 *) b[3]) + offset);
340 bi[0] = vlib_get_buffer_index (vm, ((u8 *) b[0]) + offset);
347 /** \brief Translate array of buffer pointers into buffer indices
349 @param vm - (vlib_main_t *) vlib main data structure pointer
350 @param b - (vlib_buffer_t **) array of buffer pointers
351 @param bi - (u32 *) array to store buffer indices
352 @param count - (uword) number of elements
354 static_always_inline void
355 vlib_get_buffer_indices (vlib_main_t * vm, vlib_buffer_t ** b, u32 * bi,
358 vlib_get_buffer_indices_with_offset (vm, (void **) b, bi, count, 0);
361 /** \brief Get next buffer in buffer linklist, or zero for end of list.
363 @param vm - (vlib_main_t *) vlib main data structure pointer
364 @param b - (void *) buffer pointer
365 @return - (vlib_buffer_t *) next buffer, or NULL
367 always_inline vlib_buffer_t *
368 vlib_get_next_buffer (vlib_main_t * vm, vlib_buffer_t * b)
370 return (b->flags & VLIB_BUFFER_NEXT_PRESENT
371 ? vlib_get_buffer (vm, b->next_buffer) : 0);
374 uword vlib_buffer_length_in_chain_slow_path (vlib_main_t * vm,
375 vlib_buffer_t * b_first);
377 /** \brief Get length in bytes of the buffer chain
379 @param vm - (vlib_main_t *) vlib main data structure pointer
380 @param b - (void *) buffer pointer
381 @return - (uword) length of buffer chain
384 vlib_buffer_length_in_chain (vlib_main_t * vm, vlib_buffer_t * b)
386 uword len = b->current_length;
388 if (PREDICT_TRUE ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0))
391 if (PREDICT_TRUE (b->flags & VLIB_BUFFER_TOTAL_LENGTH_VALID))
392 return len + b->total_length_not_including_first_buffer;
394 return vlib_buffer_length_in_chain_slow_path (vm, b);
397 /** \brief Get length in bytes of the buffer index buffer chain
399 @param vm - (vlib_main_t *) vlib main data structure pointer
400 @param bi - (u32) buffer index
401 @return - (uword) length of buffer chain
404 vlib_buffer_index_length_in_chain (vlib_main_t * vm, u32 bi)
406 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
407 return vlib_buffer_length_in_chain (vm, b);
410 /** \brief Copy buffer contents to memory
412 @param vm - (vlib_main_t *) vlib main data structure pointer
413 @param buffer_index - (u32) buffer index
414 @param contents - (u8 *) memory, <strong>must be large enough</strong>
415 @return - (uword) length of buffer chain
418 vlib_buffer_contents (vlib_main_t * vm, u32 buffer_index, u8 * contents)
420 uword content_len = 0;
426 b = vlib_get_buffer (vm, buffer_index);
427 l = b->current_length;
428 clib_memcpy_fast (contents + content_len, b->data + b->current_data, l);
430 if (!(b->flags & VLIB_BUFFER_NEXT_PRESENT))
432 buffer_index = b->next_buffer;
439 vlib_buffer_get_pa (vlib_main_t * vm, vlib_buffer_t * b)
441 return vlib_physmem_get_pa (vm, b->data);
445 vlib_buffer_get_current_pa (vlib_main_t * vm, vlib_buffer_t * b)
447 return vlib_buffer_get_pa (vm, b) + b->current_data;
450 /** \brief Prefetch buffer metadata by buffer index
451 The first 64 bytes of buffer contains most header information
453 @param vm - (vlib_main_t *) vlib main data structure pointer
454 @param bi - (u32) buffer index
455 @param type - LOAD, STORE. In most cases, STORE is the right answer
457 /* Prefetch buffer header given index. */
458 #define vlib_prefetch_buffer_with_index(vm,bi,type) \
460 vlib_buffer_t * _b = vlib_get_buffer (vm, bi); \
461 vlib_prefetch_buffer_header (_b, type); \
466 /* Index is unknown. */
469 /* Index is known and free/allocated. */
470 VLIB_BUFFER_KNOWN_FREE,
471 VLIB_BUFFER_KNOWN_ALLOCATED,
472 } vlib_buffer_known_state_t;
474 void vlib_buffer_validate_alloc_free (vlib_main_t * vm, u32 * buffers,
476 vlib_buffer_known_state_t
479 always_inline vlib_buffer_known_state_t
480 vlib_buffer_is_known (vlib_main_t * vm, u32 buffer_index)
482 vlib_buffer_main_t *bm = vm->buffer_main;
484 clib_spinlock_lock (&bm->buffer_known_hash_lockp);
485 uword *p = hash_get (bm->buffer_known_hash, buffer_index);
486 clib_spinlock_unlock (&bm->buffer_known_hash_lockp);
487 return p ? p[0] : VLIB_BUFFER_UNKNOWN;
490 /* Validates sanity of a single buffer.
491 Returns format'ed vector with error message if any. */
492 u8 *vlib_validate_buffer (vlib_main_t * vm, u32 buffer_index,
495 u8 *vlib_validate_buffers (vlib_main_t * vm,
497 uword next_buffer_stride,
499 vlib_buffer_known_state_t known_state,
500 uword follow_buffer_next);
502 static_always_inline vlib_buffer_pool_t *
503 vlib_get_buffer_pool (vlib_main_t * vm, u8 buffer_pool_index)
505 vlib_buffer_main_t *bm = vm->buffer_main;
506 return vec_elt_at_index (bm->buffer_pools, buffer_pool_index);
509 static_always_inline uword
510 vlib_buffer_pool_get (vlib_main_t * vm, u8 buffer_pool_index, u32 * buffers,
513 vlib_buffer_pool_t *bp = vlib_get_buffer_pool (vm, buffer_pool_index);
516 ASSERT (bp->buffers);
518 clib_spinlock_lock (&bp->lock);
520 if (PREDICT_TRUE (n_buffers < len))
523 vlib_buffer_copy_indices (buffers, bp->buffers + len, n_buffers);
525 clib_spinlock_unlock (&bp->lock);
530 vlib_buffer_copy_indices (buffers, bp->buffers, len);
532 clib_spinlock_unlock (&bp->lock);
538 /** \brief Allocate buffers from specific pool into supplied array
540 @param vm - (vlib_main_t *) vlib main data structure pointer
541 @param buffers - (u32 * ) buffer index array
542 @param n_buffers - (u32) number of buffers requested
543 @return - (u32) number of buffers actually allocated, may be
544 less than the number requested or zero
548 vlib_buffer_alloc_from_pool (vlib_main_t * vm, u32 * buffers, u32 n_buffers,
549 u8 buffer_pool_index)
551 vlib_buffer_main_t *bm = vm->buffer_main;
552 vlib_buffer_pool_t *bp;
553 vlib_buffer_pool_thread_t *bpt;
554 u32 *src, *dst, len, n_left;
556 bp = vec_elt_at_index (bm->buffer_pools, buffer_pool_index);
557 bpt = vec_elt_at_index (bp->threads, vm->thread_index);
563 /* per-thread cache contains enough buffers */
564 if (len >= n_buffers)
566 src = bpt->cached_buffers + len - n_buffers;
567 vlib_buffer_copy_indices (dst, src, n_buffers);
568 bpt->n_cached -= n_buffers;
571 vlib_buffer_validate_alloc_free (vm, buffers, n_buffers,
572 VLIB_BUFFER_KNOWN_FREE);
576 /* alloc bigger than cache - take buffers directly from main pool */
577 if (n_buffers >= VLIB_BUFFER_POOL_PER_THREAD_CACHE_SZ)
579 n_buffers = vlib_buffer_pool_get (vm, buffer_pool_index, buffers,
583 vlib_buffer_validate_alloc_free (vm, buffers, n_buffers,
584 VLIB_BUFFER_KNOWN_FREE);
588 /* take everything available in the cache */
591 vlib_buffer_copy_indices (dst, bpt->cached_buffers, len);
597 len = round_pow2 (n_left, 32);
598 len = vlib_buffer_pool_get (vm, buffer_pool_index, bpt->cached_buffers,
604 u32 n_copy = clib_min (len, n_left);
605 src = bpt->cached_buffers + len - n_copy;
606 vlib_buffer_copy_indices (dst, src, n_copy);
607 bpt->n_cached -= n_copy;
613 /* Verify that buffers are known free. */
615 vlib_buffer_validate_alloc_free (vm, buffers, n_buffers,
616 VLIB_BUFFER_KNOWN_FREE);
621 /** \brief Allocate buffers from specific numa node into supplied array
623 @param vm - (vlib_main_t *) vlib main data structure pointer
624 @param buffers - (u32 * ) buffer index array
625 @param n_buffers - (u32) number of buffers requested
626 @param numa_node - (u32) numa node
627 @return - (u32) number of buffers actually allocated, may be
628 less than the number requested or zero
631 vlib_buffer_alloc_on_numa (vlib_main_t * vm, u32 * buffers, u32 n_buffers,
634 u8 index = vlib_buffer_pool_get_default_for_numa (vm, numa_node);
635 return vlib_buffer_alloc_from_pool (vm, buffers, n_buffers, index);
638 /** \brief Allocate buffers into supplied array
640 @param vm - (vlib_main_t *) vlib main data structure pointer
641 @param buffers - (u32 * ) buffer index array
642 @param n_buffers - (u32) number of buffers requested
643 @return - (u32) number of buffers actually allocated, may be
644 less than the number requested or zero
648 vlib_buffer_alloc (vlib_main_t * vm, u32 * buffers, u32 n_buffers)
650 return vlib_buffer_alloc_on_numa (vm, buffers, n_buffers, vm->numa_node);
653 /** \brief Allocate buffers into ring
655 @param vm - (vlib_main_t *) vlib main data structure pointer
656 @param buffers - (u32 * ) buffer index ring
657 @param start - (u32) first slot in the ring
658 @param ring_size - (u32) ring size
659 @param n_buffers - (u32) number of buffers requested
660 @return - (u32) number of buffers actually allocated, may be
661 less than the number requested or zero
664 vlib_buffer_alloc_to_ring (vlib_main_t * vm, u32 * ring, u32 start,
665 u32 ring_size, u32 n_buffers)
669 ASSERT (n_buffers <= ring_size);
671 if (PREDICT_TRUE (start + n_buffers <= ring_size))
672 return vlib_buffer_alloc (vm, ring + start, n_buffers);
674 n_alloc = vlib_buffer_alloc (vm, ring + start, ring_size - start);
676 if (PREDICT_TRUE (n_alloc == ring_size - start))
677 n_alloc += vlib_buffer_alloc (vm, ring, n_buffers - n_alloc);
682 /** \brief Allocate buffers into ring from specific buffer pool
684 @param vm - (vlib_main_t *) vlib main data structure pointer
685 @param buffers - (u32 * ) buffer index ring
686 @param start - (u32) first slot in the ring
687 @param ring_size - (u32) ring size
688 @param n_buffers - (u32) number of buffers requested
689 @return - (u32) number of buffers actually allocated, may be
690 less than the number requested or zero
693 vlib_buffer_alloc_to_ring_from_pool (vlib_main_t * vm, u32 * ring, u32 start,
694 u32 ring_size, u32 n_buffers,
695 u8 buffer_pool_index)
699 ASSERT (n_buffers <= ring_size);
701 if (PREDICT_TRUE (start + n_buffers <= ring_size))
702 return vlib_buffer_alloc_from_pool (vm, ring + start, n_buffers,
705 n_alloc = vlib_buffer_alloc_from_pool (vm, ring + start, ring_size - start,
708 if (PREDICT_TRUE (n_alloc == ring_size - start))
709 n_alloc += vlib_buffer_alloc_from_pool (vm, ring, n_buffers - n_alloc,
715 static_always_inline void
716 vlib_buffer_pool_put (vlib_main_t * vm, u8 buffer_pool_index,
717 u32 * buffers, u32 n_buffers)
719 vlib_buffer_pool_t *bp = vlib_get_buffer_pool (vm, buffer_pool_index);
720 vlib_buffer_pool_thread_t *bpt = vec_elt_at_index (bp->threads,
722 u32 n_cached, n_empty;
725 vlib_buffer_validate_alloc_free (vm, buffers, n_buffers,
726 VLIB_BUFFER_KNOWN_ALLOCATED);
728 n_cached = bpt->n_cached;
729 n_empty = VLIB_BUFFER_POOL_PER_THREAD_CACHE_SZ - n_cached;
730 if (n_buffers <= n_empty)
732 vlib_buffer_copy_indices (bpt->cached_buffers + n_cached,
734 bpt->n_cached = n_cached + n_buffers;
738 vlib_buffer_copy_indices (bpt->cached_buffers + n_cached,
739 buffers + n_buffers - n_empty, n_empty);
740 bpt->n_cached = VLIB_BUFFER_POOL_PER_THREAD_CACHE_SZ;
742 clib_spinlock_lock (&bp->lock);
743 vlib_buffer_copy_indices (bp->buffers + bp->n_avail, buffers,
744 n_buffers - n_empty);
745 bp->n_avail += n_buffers - n_empty;
746 clib_spinlock_unlock (&bp->lock);
749 static_always_inline void
750 vlib_buffer_free_inline (vlib_main_t * vm, u32 * buffers, u32 n_buffers,
753 const int queue_size = 128;
754 vlib_buffer_pool_t *bp = 0;
755 u8 buffer_pool_index = ~0;
756 u32 n_queue = 0, queue[queue_size + 4];
757 vlib_buffer_t bt = { };
758 #if defined(CLIB_HAVE_VEC128)
759 vlib_buffer_t bpi_mask = {.buffer_pool_index = ~0 };
760 vlib_buffer_t bpi_vec = {.buffer_pool_index = ~0 };
761 vlib_buffer_t flags_refs_mask = {
762 .flags = VLIB_BUFFER_NEXT_PRESENT,
770 u32 bi, sum = 0, flags, next;
775 vlib_get_buffers (vm, buffers, b, 4);
776 vlib_get_buffers (vm, buffers + 8, b + 4, 4);
778 vlib_prefetch_buffer_header (b[4], LOAD);
779 vlib_prefetch_buffer_header (b[5], LOAD);
780 vlib_prefetch_buffer_header (b[6], LOAD);
781 vlib_prefetch_buffer_header (b[7], LOAD);
783 #if defined(CLIB_HAVE_VEC128)
784 u8x16 p0, p1, p2, p3, r;
785 p0 = u8x16_load_unaligned (b[0]);
786 p1 = u8x16_load_unaligned (b[1]);
787 p2 = u8x16_load_unaligned (b[2]);
788 p3 = u8x16_load_unaligned (b[3]);
790 r = p0 ^ bpi_vec.as_u8x16[0];
791 r |= p1 ^ bpi_vec.as_u8x16[0];
792 r |= p2 ^ bpi_vec.as_u8x16[0];
793 r |= p3 ^ bpi_vec.as_u8x16[0];
794 r &= bpi_mask.as_u8x16[0];
795 r |= (p0 | p1 | p2 | p3) & flags_refs_mask.as_u8x16[0];
797 sum = !u8x16_is_all_zero (r);
803 sum &= VLIB_BUFFER_NEXT_PRESENT;
804 sum += b[0]->ref_count - 1;
805 sum += b[1]->ref_count - 1;
806 sum += b[2]->ref_count - 1;
807 sum += b[3]->ref_count - 1;
808 sum |= b[0]->buffer_pool_index ^ buffer_pool_index;
809 sum |= b[1]->buffer_pool_index ^ buffer_pool_index;
810 sum |= b[2]->buffer_pool_index ^ buffer_pool_index;
811 sum |= b[3]->buffer_pool_index ^ buffer_pool_index;
817 vlib_buffer_copy_indices (queue + n_queue, buffers, 4);
818 vlib_buffer_copy_template (b[0], &bt);
819 vlib_buffer_copy_template (b[1], &bt);
820 vlib_buffer_copy_template (b[2], &bt);
821 vlib_buffer_copy_template (b[3], &bt);
824 vlib_buffer_validate (vm, b[0]);
825 vlib_buffer_validate (vm, b[1]);
826 vlib_buffer_validate (vm, b[2]);
827 vlib_buffer_validate (vm, b[3]);
829 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[0]);
830 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[1]);
831 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[2]);
832 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[3]);
834 if (n_queue >= queue_size)
836 vlib_buffer_pool_put (vm, buffer_pool_index, queue, n_queue);
847 b[0] = vlib_get_buffer (vm, bi);
849 next = b[0]->next_buffer;
851 if (PREDICT_FALSE (buffer_pool_index != b[0]->buffer_pool_index))
856 vlib_buffer_pool_put (vm, buffer_pool_index, queue, n_queue);
860 buffer_pool_index = b[0]->buffer_pool_index;
861 #if defined(CLIB_HAVE_VEC128)
862 bpi_vec.buffer_pool_index = buffer_pool_index;
864 bp = vlib_get_buffer_pool (vm, buffer_pool_index);
865 vlib_buffer_copy_template (&bt, &bp->buffer_template);
868 vlib_buffer_validate (vm, b[0]);
870 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[0]);
872 if (clib_atomic_sub_fetch (&b[0]->ref_count, 1) == 0)
874 vlib_buffer_copy_template (b[0], &bt);
875 queue[n_queue++] = bi;
878 if (n_queue == queue_size)
880 vlib_buffer_pool_put (vm, buffer_pool_index, queue, queue_size);
884 if (maybe_next && (flags & VLIB_BUFFER_NEXT_PRESENT))
895 vlib_buffer_pool_put (vm, buffer_pool_index, queue, n_queue);
899 /** \brief Free buffers
900 Frees the entire buffer chain for each buffer
902 @param vm - (vlib_main_t *) vlib main data structure pointer
903 @param buffers - (u32 * ) buffer index array
904 @param n_buffers - (u32) number of buffers to free
908 vlib_buffer_free (vlib_main_t * vm,
909 /* pointer to first buffer */
911 /* number of buffers to free */
914 vlib_buffer_free_inline (vm, buffers, n_buffers, /* maybe next */ 1);
917 /** \brief Free buffers, does not free the buffer chain for each buffer
919 @param vm - (vlib_main_t *) vlib main data structure pointer
920 @param buffers - (u32 * ) buffer index array
921 @param n_buffers - (u32) number of buffers to free
925 vlib_buffer_free_no_next (vlib_main_t * vm,
926 /* pointer to first buffer */
928 /* number of buffers to free */
931 vlib_buffer_free_inline (vm, buffers, n_buffers, /* maybe next */ 0);
934 /** \brief Free one buffer
935 Shorthand to free a single buffer chain.
937 @param vm - (vlib_main_t *) vlib main data structure pointer
938 @param buffer_index - (u32) buffer index to free
941 vlib_buffer_free_one (vlib_main_t * vm, u32 buffer_index)
943 vlib_buffer_free_inline (vm, &buffer_index, 1, /* maybe next */ 1);
946 /** \brief Free buffers from ring
948 @param vm - (vlib_main_t *) vlib main data structure pointer
949 @param buffers - (u32 * ) buffer index ring
950 @param start - (u32) first slot in the ring
951 @param ring_size - (u32) ring size
952 @param n_buffers - (u32) number of buffers
955 vlib_buffer_free_from_ring (vlib_main_t * vm, u32 * ring, u32 start,
956 u32 ring_size, u32 n_buffers)
958 ASSERT (n_buffers <= ring_size);
960 if (PREDICT_TRUE (start + n_buffers <= ring_size))
962 vlib_buffer_free (vm, ring + start, n_buffers);
966 vlib_buffer_free (vm, ring + start, ring_size - start);
967 vlib_buffer_free (vm, ring, n_buffers - (ring_size - start));
971 /** \brief Free buffers from ring without freeing tail buffers
973 @param vm - (vlib_main_t *) vlib main data structure pointer
974 @param buffers - (u32 * ) buffer index ring
975 @param start - (u32) first slot in the ring
976 @param ring_size - (u32) ring size
977 @param n_buffers - (u32) number of buffers
980 vlib_buffer_free_from_ring_no_next (vlib_main_t * vm, u32 * ring, u32 start,
981 u32 ring_size, u32 n_buffers)
983 ASSERT (n_buffers <= ring_size);
985 if (PREDICT_TRUE (start + n_buffers <= ring_size))
987 vlib_buffer_free_no_next (vm, ring + start, n_buffers);
991 vlib_buffer_free_no_next (vm, ring + start, ring_size - start);
992 vlib_buffer_free_no_next (vm, ring, n_buffers - (ring_size - start));
996 /* Append given data to end of buffer, possibly allocating new buffers. */
997 int vlib_buffer_add_data (vlib_main_t * vm, u32 * buffer_index, void *data,
1000 /* Define vlib_buffer and vnet_buffer flags bits preserved for copy/clone */
1001 #define VLIB_BUFFER_COPY_CLONE_FLAGS_MASK \
1002 (VLIB_BUFFER_NEXT_PRESENT | VLIB_BUFFER_TOTAL_LENGTH_VALID | \
1003 VLIB_BUFFER_IS_TRACED | ~VLIB_BUFFER_FLAGS_ALL)
1005 /* duplicate all buffers in chain */
1006 always_inline vlib_buffer_t *
1007 vlib_buffer_copy (vlib_main_t * vm, vlib_buffer_t * b)
1009 vlib_buffer_t *s, *d, *fd;
1010 uword n_alloc, n_buffers = 1;
1011 u32 flag_mask = VLIB_BUFFER_COPY_CLONE_FLAGS_MASK;
1015 while (s->flags & VLIB_BUFFER_NEXT_PRESENT)
1018 s = vlib_get_buffer (vm, s->next_buffer);
1020 u32 new_buffers[n_buffers];
1022 n_alloc = vlib_buffer_alloc (vm, new_buffers, n_buffers);
1024 /* No guarantee that we'll get all the buffers we asked for */
1025 if (PREDICT_FALSE (n_alloc < n_buffers))
1028 vlib_buffer_free (vm, new_buffers, n_alloc);
1034 fd = d = vlib_get_buffer (vm, new_buffers[0]);
1035 d->current_data = s->current_data;
1036 d->current_length = s->current_length;
1037 d->flags = s->flags & flag_mask;
1038 d->trace_handle = s->trace_handle;
1039 d->total_length_not_including_first_buffer =
1040 s->total_length_not_including_first_buffer;
1041 clib_memcpy_fast (d->opaque, s->opaque, sizeof (s->opaque));
1042 clib_memcpy_fast (d->opaque2, s->opaque2, sizeof (s->opaque2));
1043 clib_memcpy_fast (vlib_buffer_get_current (d),
1044 vlib_buffer_get_current (s), s->current_length);
1047 for (i = 1; i < n_buffers; i++)
1050 d->next_buffer = new_buffers[i];
1052 s = vlib_get_buffer (vm, s->next_buffer);
1053 d = vlib_get_buffer (vm, new_buffers[i]);
1054 d->current_data = s->current_data;
1055 d->current_length = s->current_length;
1056 clib_memcpy_fast (vlib_buffer_get_current (d),
1057 vlib_buffer_get_current (s), s->current_length);
1058 d->flags = s->flags & flag_mask;
1064 /* duplicate first buffer in chain */
1065 always_inline vlib_buffer_t *
1066 vlib_buffer_copy_no_chain (vlib_main_t * vm, vlib_buffer_t * b, u32 * di)
1070 if ((vlib_buffer_alloc (vm, di, 1)) != 1)
1073 d = vlib_get_buffer (vm, *di);
1075 d->current_data = b->current_data;
1076 d->current_length = b->current_length;
1077 clib_memcpy_fast (d->opaque, b->opaque, sizeof (b->opaque));
1078 clib_memcpy_fast (d->opaque2, b->opaque2, sizeof (b->opaque2));
1079 clib_memcpy_fast (vlib_buffer_get_current (d),
1080 vlib_buffer_get_current (b), b->current_length);
1085 /* \brief Move packet from current position to offset position in buffer.
1086 Only work for small packet using one buffer with room to fit the move
1087 @param vm - (vlib_main_t *) vlib main data structure pointer
1088 @param b - (vlib_buffer_t *) pointer to buffer
1089 @param offset - (i16) position to move the packet in buffer
1092 vlib_buffer_move (vlib_main_t * vm, vlib_buffer_t * b, i16 offset)
1094 ASSERT ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0);
1095 ASSERT (offset + VLIB_BUFFER_PRE_DATA_SIZE >= 0);
1096 ASSERT (offset + b->current_length <
1097 vlib_buffer_get_default_data_size (vm));
1099 u8 *source = vlib_buffer_get_current (b);
1100 b->current_data = offset;
1101 u8 *destination = vlib_buffer_get_current (b);
1102 u16 length = b->current_length;
1104 if (source + length <= destination) /* no overlap */
1105 clib_memcpy_fast (destination, source, length);
1107 memmove (destination, source, length);
1110 /** \brief Create a maximum of 256 clones of buffer and store them
1111 in the supplied array
1113 @param vm - (vlib_main_t *) vlib main data structure pointer
1114 @param src_buffer - (u32) source buffer index
1115 @param buffers - (u32 * ) buffer index array
1116 @param n_buffers - (u16) number of buffer clones requested (<=256)
1117 @param head_end_offset - (u16) offset relative to current position
1118 where packet head ends
1119 @param offset - (i16) copy packet head at current position if 0,
1120 else at offset position to change headroom space as specified
1121 @return - (u16) number of buffers actually cloned, may be
1122 less than the number requested or zero
1125 vlib_buffer_clone_256 (vlib_main_t * vm, u32 src_buffer, u32 * buffers,
1126 u16 n_buffers, u16 head_end_offset, i16 offset)
1129 vlib_buffer_t *s = vlib_get_buffer (vm, src_buffer);
1131 ASSERT (s->ref_count == 1);
1133 ASSERT (n_buffers <= 256);
1134 ASSERT (offset + VLIB_BUFFER_PRE_DATA_SIZE >= 0);
1135 ASSERT ((offset + head_end_offset) <
1136 vlib_buffer_get_default_data_size (vm));
1138 if (s->current_length <= head_end_offset + CLIB_CACHE_LINE_BYTES * 2)
1140 buffers[0] = src_buffer;
1142 vlib_buffer_move (vm, s, offset);
1144 for (i = 1; i < n_buffers; i++)
1147 d = vlib_buffer_copy (vm, s);
1150 buffers[i] = vlib_get_buffer_index (vm, d);
1156 if (PREDICT_FALSE ((n_buffers == 1) && (offset == 0)))
1158 buffers[0] = src_buffer;
1162 n_buffers = vlib_buffer_alloc_from_pool (vm, buffers, n_buffers,
1163 s->buffer_pool_index);
1165 for (i = 0; i < n_buffers; i++)
1167 vlib_buffer_t *d = vlib_get_buffer (vm, buffers[i]);
1169 d->current_data = offset;
1171 d->current_data = s->current_data;
1173 d->current_length = head_end_offset;
1174 ASSERT (d->buffer_pool_index == s->buffer_pool_index);
1176 d->total_length_not_including_first_buffer = s->current_length -
1178 if (PREDICT_FALSE (s->flags & VLIB_BUFFER_NEXT_PRESENT))
1180 d->total_length_not_including_first_buffer +=
1181 s->total_length_not_including_first_buffer;
1183 d->flags = (s->flags & VLIB_BUFFER_COPY_CLONE_FLAGS_MASK) |
1184 VLIB_BUFFER_NEXT_PRESENT;
1185 d->trace_handle = s->trace_handle;
1186 clib_memcpy_fast (d->opaque, s->opaque, sizeof (s->opaque));
1187 clib_memcpy_fast (d->opaque2, s->opaque2, sizeof (s->opaque2));
1188 clib_memcpy_fast (vlib_buffer_get_current (d),
1189 vlib_buffer_get_current (s), head_end_offset);
1190 d->next_buffer = src_buffer;
1192 vlib_buffer_advance (s, head_end_offset);
1193 s->ref_count = n_buffers;
1194 while (s->flags & VLIB_BUFFER_NEXT_PRESENT)
1196 s = vlib_get_buffer (vm, s->next_buffer);
1197 s->ref_count = n_buffers;
1203 /** \brief Create multiple clones of buffer and store them
1204 in the supplied array
1206 @param vm - (vlib_main_t *) vlib main data structure pointer
1207 @param src_buffer - (u32) source buffer index
1208 @param buffers - (u32 * ) buffer index array
1209 @param n_buffers - (u16) number of buffer clones requested (<=256)
1210 @param head_end_offset - (u16) offset relative to current position
1211 where packet head ends
1212 @param offset - (i16) copy packet head at current position if 0,
1213 else at offset position to change headroom space as specified
1214 @return - (u16) number of buffers actually cloned, may be
1215 less than the number requested or zero
1218 vlib_buffer_clone_at_offset (vlib_main_t * vm, u32 src_buffer, u32 * buffers,
1219 u16 n_buffers, u16 head_end_offset, i16 offset)
1221 vlib_buffer_t *s = vlib_get_buffer (vm, src_buffer);
1224 while (n_buffers > 256)
1226 vlib_buffer_t *copy;
1227 copy = vlib_buffer_copy (vm, s);
1228 n_cloned += vlib_buffer_clone_256 (vm,
1229 vlib_get_buffer_index (vm, copy),
1230 (buffers + n_cloned),
1231 256, head_end_offset, offset);
1234 n_cloned += vlib_buffer_clone_256 (vm, src_buffer,
1236 n_buffers, head_end_offset, offset);
1241 /** \brief Create multiple clones of buffer and store them
1242 in the supplied array
1244 @param vm - (vlib_main_t *) vlib main data structure pointer
1245 @param src_buffer - (u32) source buffer index
1246 @param buffers - (u32 * ) buffer index array
1247 @param n_buffers - (u16) number of buffer clones requested (<=256)
1248 @param head_end_offset - (u16) offset relative to current position
1249 where packet head ends
1250 @return - (u16) number of buffers actually cloned, may be
1251 less than the number requested or zero
1254 vlib_buffer_clone (vlib_main_t * vm, u32 src_buffer, u32 * buffers,
1255 u16 n_buffers, u16 head_end_offset)
1257 return vlib_buffer_clone_at_offset (vm, src_buffer, buffers, n_buffers,
1258 head_end_offset, 0);
1261 /** \brief Attach cloned tail to the buffer
1263 @param vm - (vlib_main_t *) vlib main data structure pointer
1264 @param head - (vlib_buffer_t *) head buffer
1265 @param tail - (Vlib buffer_t *) tail buffer to clone and attach to head
1269 vlib_buffer_attach_clone (vlib_main_t * vm, vlib_buffer_t * head,
1270 vlib_buffer_t * tail)
1272 ASSERT ((head->flags & VLIB_BUFFER_NEXT_PRESENT) == 0);
1273 ASSERT (head->buffer_pool_index == tail->buffer_pool_index);
1275 head->flags |= VLIB_BUFFER_NEXT_PRESENT;
1276 head->flags &= ~VLIB_BUFFER_TOTAL_LENGTH_VALID;
1277 head->flags &= ~VLIB_BUFFER_EXT_HDR_VALID;
1278 head->flags |= (tail->flags & VLIB_BUFFER_TOTAL_LENGTH_VALID);
1279 head->next_buffer = vlib_get_buffer_index (vm, tail);
1280 head->total_length_not_including_first_buffer = tail->current_length +
1281 tail->total_length_not_including_first_buffer;
1284 clib_atomic_add_fetch (&tail->ref_count, 1);
1286 if (tail->flags & VLIB_BUFFER_NEXT_PRESENT)
1288 tail = vlib_get_buffer (vm, tail->next_buffer);
1293 /* Initializes the buffer as an empty packet with no chained buffers. */
1295 vlib_buffer_chain_init (vlib_buffer_t * first)
1297 first->total_length_not_including_first_buffer = 0;
1298 first->current_length = 0;
1299 first->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
1300 first->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
1303 /* The provided next_bi buffer index is appended to the end of the packet. */
1304 always_inline vlib_buffer_t *
1305 vlib_buffer_chain_buffer (vlib_main_t * vm, vlib_buffer_t * last, u32 next_bi)
1307 vlib_buffer_t *next_buffer = vlib_get_buffer (vm, next_bi);
1308 last->next_buffer = next_bi;
1309 last->flags |= VLIB_BUFFER_NEXT_PRESENT;
1310 next_buffer->current_length = 0;
1311 next_buffer->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
1315 /* Increases or decreases the packet length.
1316 * It does not allocate or deallocate new buffers.
1317 * Therefore, the added length must be compatible
1318 * with the last buffer. */
1320 vlib_buffer_chain_increase_length (vlib_buffer_t * first,
1321 vlib_buffer_t * last, i32 len)
1323 last->current_length += len;
1325 first->total_length_not_including_first_buffer += len;
1328 /* Copy data to the end of the packet and increases its length.
1329 * It does not allocate new buffers.
1330 * Returns the number of copied bytes. */
1332 vlib_buffer_chain_append_data (vlib_main_t * vm,
1333 vlib_buffer_t * first,
1334 vlib_buffer_t * last, void *data, u16 data_len)
1336 u32 n_buffer_bytes = vlib_buffer_get_default_data_size (vm);
1337 ASSERT (n_buffer_bytes >= last->current_length + last->current_data);
1338 u16 len = clib_min (data_len,
1339 n_buffer_bytes - last->current_length -
1340 last->current_data);
1341 clib_memcpy_fast (vlib_buffer_get_current (last) + last->current_length,
1343 vlib_buffer_chain_increase_length (first, last, len);
1347 /* Copy data to the end of the packet and increases its length.
1348 * Allocates additional buffers from the free list if necessary.
1349 * Returns the number of copied bytes.
1350 * 'last' value is modified whenever new buffers are allocated and
1351 * chained and points to the last buffer in the chain. */
1353 vlib_buffer_chain_append_data_with_alloc (vlib_main_t * vm,
1354 vlib_buffer_t * first,
1355 vlib_buffer_t ** last, void *data,
1357 void vlib_buffer_chain_validate (vlib_main_t * vm, vlib_buffer_t * first);
1359 format_function_t format_vlib_buffer, format_vlib_buffer_and_data,
1360 format_vlib_buffer_contents, format_vlib_buffer_no_chain;
1364 /* Vector of packet data. */
1367 /* Number of buffers to allocate in each call to allocator. */
1368 u32 min_n_buffers_each_alloc;
1371 } vlib_packet_template_t;
1373 void vlib_packet_template_init (vlib_main_t * vm,
1374 vlib_packet_template_t * t,
1376 uword n_packet_data_bytes,
1377 uword min_n_buffers_each_alloc,
1380 void *vlib_packet_template_get_packet (vlib_main_t * vm,
1381 vlib_packet_template_t * t,
1385 vlib_packet_template_free (vlib_main_t * vm, vlib_packet_template_t * t)
1387 vec_free (t->packet_data);
1391 vlib_buffer_space_left_at_end (vlib_main_t * vm, vlib_buffer_t * b)
1393 return b->data + vlib_buffer_get_default_data_size (vm) -
1394 ((u8 *) vlib_buffer_get_current (b) + b->current_length);
1398 vlib_buffer_chain_linearize (vlib_main_t * vm, vlib_buffer_t * b)
1400 vlib_buffer_t *db = b, *sb, *first = b;
1402 u32 bytes_left = 0, data_size;
1403 u16 src_left, dst_left, n_buffers = 1;
1407 if (PREDICT_TRUE ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0))
1410 data_size = vlib_buffer_get_default_data_size (vm);
1412 dst_left = vlib_buffer_space_left_at_end (vm, b);
1414 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
1416 b = vlib_get_buffer (vm, b->next_buffer);
1417 if (b->ref_count > 1)
1419 bytes_left += b->current_length;
1423 /* if buffer is cloned, create completely new chain - unless everything fits
1424 * into one buffer */
1425 if (is_cloned && bytes_left >= dst_left)
1428 u32 space_needed = bytes_left - dst_left;
1431 if (vlib_buffer_alloc (vm, &tail, 1) == 0)
1436 b = vlib_get_buffer (vm, tail);
1438 while (len < space_needed)
1441 if (vlib_buffer_alloc (vm, &bi, 1) == 0)
1443 vlib_buffer_free_one (vm, tail);
1446 b->flags = VLIB_BUFFER_NEXT_PRESENT;
1447 b->next_buffer = bi;
1448 b = vlib_get_buffer (vm, bi);
1452 sb = vlib_get_buffer (vm, first->next_buffer);
1453 to_free = first->next_buffer;
1454 first->next_buffer = tail;
1457 sb = vlib_get_buffer (vm, first->next_buffer);
1459 src_left = sb->current_length;
1460 sp = vlib_buffer_get_current (sb);
1461 dp = vlib_buffer_get_tail (db);
1469 db->current_length = dp - (u8 *) vlib_buffer_get_current (db);
1470 ASSERT (db->flags & VLIB_BUFFER_NEXT_PRESENT);
1471 db = vlib_get_buffer (vm, db->next_buffer);
1472 dst_left = data_size;
1473 if (db->current_data > 0)
1475 db->current_data = 0;
1479 dst_left += -db->current_data;
1481 dp = vlib_buffer_get_current (db);
1484 while (src_left == 0)
1486 ASSERT (sb->flags & VLIB_BUFFER_NEXT_PRESENT);
1487 sb = vlib_get_buffer (vm, sb->next_buffer);
1488 src_left = sb->current_length;
1489 sp = vlib_buffer_get_current (sb);
1492 bytes_to_copy = clib_min (dst_left, src_left);
1497 bytes_to_copy = clib_min (bytes_to_copy, sp - dp);
1499 clib_memcpy_fast (dp, sp, bytes_to_copy);
1502 src_left -= bytes_to_copy;
1503 dst_left -= bytes_to_copy;
1504 dp += bytes_to_copy;
1505 sp += bytes_to_copy;
1506 bytes_left -= bytes_to_copy;
1509 db->current_data = 0;
1510 db->current_length = dp - (u8 *) vlib_buffer_get_current (db);
1512 if (is_cloned && to_free)
1513 vlib_buffer_free_one (vm, to_free);
1516 if (db->flags & VLIB_BUFFER_NEXT_PRESENT)
1517 vlib_buffer_free_one (vm, db->next_buffer);
1518 db->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
1521 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
1523 b = vlib_get_buffer (vm, b->next_buffer);
1528 first->flags &= ~VLIB_BUFFER_TOTAL_LENGTH_VALID;
1533 #endif /* included_vlib_buffer_funcs_h */
1536 * fd.io coding-style-patch-verification: ON
1539 * eval: (c-set-style "gnu")