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 <vppinfra/vector/index_to_ptr.h>
46 #include <vlib/buffer.h>
47 #include <vlib/physmem_funcs.h>
48 #include <vlib/main.h>
49 #include <vlib/node.h>
52 vlib buffer access methods.
55 typedef void (vlib_buffer_enqueue_to_next_fn_t) (vlib_main_t *vm,
56 vlib_node_runtime_t *node,
57 u32 *buffers, u16 *nexts,
59 typedef void (vlib_buffer_enqueue_to_single_next_fn_t) (
60 vlib_main_t *vm, vlib_node_runtime_t *node, u32 *ers, u16 next_index,
63 typedef u32 (vlib_buffer_enqueue_to_thread_fn_t) (
64 vlib_main_t *vm, vlib_node_runtime_t *node, u32 frame_queue_index,
65 u32 *buffer_indices, u16 *thread_indices, u32 n_packets,
66 int drop_on_congestion);
68 typedef u32 (vlib_frame_queue_dequeue_fn_t) (vlib_main_t *vm,
69 vlib_frame_queue_main_t *fqm);
73 vlib_buffer_enqueue_to_next_fn_t *buffer_enqueue_to_next_fn;
74 vlib_buffer_enqueue_to_single_next_fn_t *buffer_enqueue_to_single_next_fn;
75 vlib_buffer_enqueue_to_thread_fn_t *buffer_enqueue_to_thread_fn;
76 vlib_frame_queue_dequeue_fn_t *frame_queue_dequeue_fn;
77 } vlib_buffer_func_main_t;
79 extern vlib_buffer_func_main_t vlib_buffer_func_main;
82 vlib_buffer_validate (vlib_main_t * vm, vlib_buffer_t * b)
84 vlib_buffer_main_t *bm = vm->buffer_main;
85 vlib_buffer_pool_t *bp;
87 /* reference count in allocated buffer always must be 1 or higher */
88 ASSERT (b->ref_count > 0);
90 /* verify that buffer pool index is valid */
91 bp = vec_elt_at_index (bm->buffer_pools, b->buffer_pool_index);
92 ASSERT (pointer_to_uword (b) >= bp->start);
93 ASSERT (pointer_to_uword (b) < bp->start + bp->size -
94 (bp->data_size + sizeof (vlib_buffer_t)));
98 vlib_buffer_ptr_from_index (uword buffer_mem_start, u32 buffer_index,
101 offset += ((uword) buffer_index) << CLIB_LOG2_CACHE_LINE_BYTES;
102 return uword_to_pointer (buffer_mem_start + offset, vlib_buffer_t *);
105 /** \brief Translate buffer index into buffer pointer
107 @param vm - (vlib_main_t *) vlib main data structure pointer
108 @param buffer_index - (u32) buffer index
109 @return - (vlib_buffer_t *) buffer pointer
111 always_inline vlib_buffer_t *
112 vlib_get_buffer (vlib_main_t * vm, u32 buffer_index)
114 vlib_buffer_main_t *bm = vm->buffer_main;
117 b = vlib_buffer_ptr_from_index (bm->buffer_mem_start, buffer_index, 0);
118 vlib_buffer_validate (vm, b);
122 static_always_inline u32
123 vlib_buffer_get_default_data_size (vlib_main_t * vm)
125 return vm->buffer_main->default_data_size;
128 static_always_inline void
129 vlib_buffer_copy_indices (u32 * dst, u32 * src, u32 n_indices)
131 clib_memcpy_u32 (dst, src, n_indices);
135 vlib_buffer_copy_indices_from_ring (u32 * dst, u32 * ring, u32 start,
136 u32 ring_size, u32 n_buffers)
138 ASSERT (n_buffers <= ring_size);
140 if (PREDICT_TRUE (start + n_buffers <= ring_size))
142 vlib_buffer_copy_indices (dst, ring + start, n_buffers);
146 u32 n = ring_size - start;
147 vlib_buffer_copy_indices (dst, ring + start, n);
148 vlib_buffer_copy_indices (dst + n, ring, n_buffers - n);
153 vlib_buffer_copy_indices_to_ring (u32 * ring, u32 * src, u32 start,
154 u32 ring_size, u32 n_buffers)
156 ASSERT (n_buffers <= ring_size);
158 if (PREDICT_TRUE (start + n_buffers <= ring_size))
160 vlib_buffer_copy_indices (ring + start, src, n_buffers);
164 u32 n = ring_size - start;
165 vlib_buffer_copy_indices (ring + start, src, n);
166 vlib_buffer_copy_indices (ring, src + n, n_buffers - n);
170 STATIC_ASSERT_OFFSET_OF (vlib_buffer_t, template_end, 64);
171 static_always_inline void
172 vlib_buffer_copy_template (vlib_buffer_t * b, vlib_buffer_t * bt)
174 #if defined CLIB_HAVE_VEC512
175 b->as_u8x64[0] = bt->as_u8x64[0];
176 #elif defined (CLIB_HAVE_VEC256)
177 b->as_u8x32[0] = bt->as_u8x32[0];
178 b->as_u8x32[1] = bt->as_u8x32[1];
179 #elif defined (CLIB_HAVE_VEC128)
180 b->as_u8x16[0] = bt->as_u8x16[0];
181 b->as_u8x16[1] = bt->as_u8x16[1];
182 b->as_u8x16[2] = bt->as_u8x16[2];
183 b->as_u8x16[3] = bt->as_u8x16[3];
185 clib_memcpy_fast (b, bt, 64);
190 vlib_buffer_pool_get_default_for_numa (vlib_main_t * vm, u32 numa_node)
192 ASSERT (numa_node < VLIB_BUFFER_MAX_NUMA_NODES);
193 return vm->buffer_main->default_buffer_pool_index_for_numa[numa_node];
196 /** \brief Translate array of buffer indices into buffer pointers with offset
198 @param vm - (vlib_main_t *) vlib main data structure pointer
199 @param bi - (u32 *) array of buffer indices
200 @param b - (void **) array to store buffer pointers
201 @param count - (uword) number of elements
202 @param offset - (i32) offset applied to each pointer
204 static_always_inline void
205 vlib_get_buffers_with_offset (vlib_main_t *vm, u32 *bi, void **b, u32 count,
208 uword buffer_mem_start = vm->buffer_main->buffer_mem_start;
209 void *base = (void *) (buffer_mem_start + offset);
210 int objsize = __builtin_object_size (b, 0);
211 const int sh = CLIB_LOG2_CACHE_LINE_BYTES;
213 if (COMPILE_TIME_CONST (count) == 0 && objsize >= 64 * sizeof (b[0]) &&
214 (objsize & ((8 * sizeof (b[0])) - 1)) == 0)
216 u32 n = round_pow2 (count, 8);
217 ASSERT (objsize >= count);
218 CLIB_ASSUME (objsize >= count);
221 clib_index_to_ptr_u32 (bi, base, sh, b, 64);
229 clib_index_to_ptr_u32 (bi, base, sh, b, 8);
236 clib_index_to_ptr_u32 (bi, base, sh, b, count);
239 /** \brief Translate array of buffer indices into buffer pointers
241 @param vm - (vlib_main_t *) vlib main data structure pointer
242 @param bi - (u32 *) array of buffer indices
243 @param b - (vlib_buffer_t **) array to store buffer pointers
244 @param count - (uword) number of elements
247 static_always_inline void
248 vlib_get_buffers (vlib_main_t *vm, u32 *bi, vlib_buffer_t **b, u32 count)
250 vlib_get_buffers_with_offset (vm, bi, (void **) b, count, 0);
253 /** \brief Translate buffer pointer into buffer index
255 @param vm - (vlib_main_t *) vlib main data structure pointer
256 @param p - (void *) buffer pointer
257 @return - (u32) buffer index
261 vlib_get_buffer_index (vlib_main_t * vm, void *p)
263 vlib_buffer_main_t *bm = vm->buffer_main;
264 uword offset = pointer_to_uword (p) - bm->buffer_mem_start;
265 ASSERT (pointer_to_uword (p) >= bm->buffer_mem_start);
266 ASSERT (offset < bm->buffer_mem_size);
267 ASSERT ((offset % (1 << CLIB_LOG2_CACHE_LINE_BYTES)) == 0);
268 return offset >> CLIB_LOG2_CACHE_LINE_BYTES;
271 /** \brief Translate array of buffer pointers into buffer indices with offset
273 @param vm - (vlib_main_t *) vlib main data structure pointer
274 @param b - (void **) array of buffer pointers
275 @param bi - (u32 *) array to store buffer indices
276 @param count - (uword) number of elements
277 @param offset - (i32) offset applied to each pointer
279 static_always_inline void
280 vlib_get_buffer_indices_with_offset (vlib_main_t * vm, void **b, u32 * bi,
281 uword count, i32 offset)
283 #ifdef CLIB_HAVE_VEC256
284 u32x8 mask = { 0, 2, 4, 6, 1, 3, 5, 7 };
285 u64x4 off4 = u64x4_splat (vm->buffer_main->buffer_mem_start - offset);
289 /* load 4 pointers into 256-bit register */
290 u64x4 v0 = u64x4_load_unaligned (b);
291 u64x4 v1 = u64x4_load_unaligned (b + 4);
297 v0 >>= CLIB_LOG2_CACHE_LINE_BYTES;
298 v1 >>= CLIB_LOG2_CACHE_LINE_BYTES;
300 /* permute 256-bit register so lower u32s of each buffer index are
301 * placed into lower 128-bits */
302 v2 = u32x8_permute ((u32x8) v0, mask);
303 v3 = u32x8_permute ((u32x8) v1, mask);
305 /* extract lower 128-bits and save them to the array of buffer indices */
306 u32x4_store_unaligned (u32x8_extract_lo (v2), bi);
307 u32x4_store_unaligned (u32x8_extract_lo (v3), bi + 4);
315 /* equivalent non-nector implementation */
316 bi[0] = vlib_get_buffer_index (vm, ((u8 *) b[0]) + offset);
317 bi[1] = vlib_get_buffer_index (vm, ((u8 *) b[1]) + offset);
318 bi[2] = vlib_get_buffer_index (vm, ((u8 *) b[2]) + offset);
319 bi[3] = vlib_get_buffer_index (vm, ((u8 *) b[3]) + offset);
326 bi[0] = vlib_get_buffer_index (vm, ((u8 *) b[0]) + offset);
333 /** \brief Translate array of buffer pointers into buffer indices
335 @param vm - (vlib_main_t *) vlib main data structure pointer
336 @param b - (vlib_buffer_t **) array of buffer pointers
337 @param bi - (u32 *) array to store buffer indices
338 @param count - (uword) number of elements
340 static_always_inline void
341 vlib_get_buffer_indices (vlib_main_t * vm, vlib_buffer_t ** b, u32 * bi,
344 vlib_get_buffer_indices_with_offset (vm, (void **) b, bi, count, 0);
347 /** \brief Get next buffer in buffer linklist, or zero for end of list.
349 @param vm - (vlib_main_t *) vlib main data structure pointer
350 @param b - (void *) buffer pointer
351 @return - (vlib_buffer_t *) next buffer, or NULL
353 always_inline vlib_buffer_t *
354 vlib_get_next_buffer (vlib_main_t * vm, vlib_buffer_t * b)
356 return (b->flags & VLIB_BUFFER_NEXT_PRESENT
357 ? vlib_get_buffer (vm, b->next_buffer) : 0);
360 uword vlib_buffer_length_in_chain_slow_path (vlib_main_t * vm,
361 vlib_buffer_t * b_first);
363 /** \brief Get length in bytes of the buffer chain
365 @param vm - (vlib_main_t *) vlib main data structure pointer
366 @param b - (void *) buffer pointer
367 @return - (uword) length of buffer chain
370 vlib_buffer_length_in_chain (vlib_main_t * vm, vlib_buffer_t * b)
372 uword len = b->current_length;
374 if (PREDICT_TRUE ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0))
377 if (PREDICT_TRUE (b->flags & VLIB_BUFFER_TOTAL_LENGTH_VALID))
378 return len + b->total_length_not_including_first_buffer;
380 return vlib_buffer_length_in_chain_slow_path (vm, b);
383 /** \brief Get length in bytes of the buffer index buffer chain
385 @param vm - (vlib_main_t *) vlib main data structure pointer
386 @param bi - (u32) buffer index
387 @return - (uword) length of buffer chain
390 vlib_buffer_index_length_in_chain (vlib_main_t * vm, u32 bi)
392 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
393 return vlib_buffer_length_in_chain (vm, b);
396 /** \brief Copy buffer contents to memory
398 @param vm - (vlib_main_t *) vlib main data structure pointer
399 @param buffer_index - (u32) buffer index
400 @param contents - (u8 *) memory, <strong>must be large enough</strong>
401 @return - (uword) length of buffer chain
404 vlib_buffer_contents (vlib_main_t * vm, u32 buffer_index, u8 * contents)
406 uword content_len = 0;
412 b = vlib_get_buffer (vm, buffer_index);
413 l = b->current_length;
414 clib_memcpy_fast (contents + content_len, b->data + b->current_data, l);
416 if (!(b->flags & VLIB_BUFFER_NEXT_PRESENT))
418 buffer_index = b->next_buffer;
425 vlib_buffer_get_pa (vlib_main_t * vm, vlib_buffer_t * b)
427 return vlib_physmem_get_pa (vm, b->data);
431 vlib_buffer_get_current_pa (vlib_main_t * vm, vlib_buffer_t * b)
433 return vlib_buffer_get_pa (vm, b) + b->current_data;
436 /** \brief Prefetch buffer metadata by buffer index
437 The first 64 bytes of buffer contains most header information
439 @param vm - (vlib_main_t *) vlib main data structure pointer
440 @param bi - (u32) buffer index
441 @param type - LOAD, STORE. In most cases, STORE is the right answer
443 /* Prefetch buffer header given index. */
444 #define vlib_prefetch_buffer_with_index(vm,bi,type) \
446 vlib_buffer_t * _b = vlib_get_buffer (vm, bi); \
447 vlib_prefetch_buffer_header (_b, type); \
452 /* Index is unknown. */
455 /* Index is known and free/allocated. */
456 VLIB_BUFFER_KNOWN_FREE,
457 VLIB_BUFFER_KNOWN_ALLOCATED,
458 } vlib_buffer_known_state_t;
460 void vlib_buffer_validate_alloc_free (vlib_main_t * vm, u32 * buffers,
462 vlib_buffer_known_state_t
465 always_inline vlib_buffer_known_state_t
466 vlib_buffer_is_known (vlib_main_t * vm, u32 buffer_index)
468 vlib_buffer_main_t *bm = vm->buffer_main;
470 clib_spinlock_lock (&bm->buffer_known_hash_lockp);
471 uword *p = hash_get (bm->buffer_known_hash, buffer_index);
472 clib_spinlock_unlock (&bm->buffer_known_hash_lockp);
473 return p ? p[0] : VLIB_BUFFER_UNKNOWN;
476 /* Validates sanity of a single buffer.
477 Returns format'ed vector with error message if any. */
478 u8 *vlib_validate_buffer (vlib_main_t * vm, u32 buffer_index,
481 u8 *vlib_validate_buffers (vlib_main_t * vm,
483 uword next_buffer_stride,
485 vlib_buffer_known_state_t known_state,
486 uword follow_buffer_next);
488 static_always_inline vlib_buffer_pool_t *
489 vlib_get_buffer_pool (vlib_main_t * vm, u8 buffer_pool_index)
491 vlib_buffer_main_t *bm = vm->buffer_main;
492 return vec_elt_at_index (bm->buffer_pools, buffer_pool_index);
495 static_always_inline __clib_warn_unused_result uword
496 vlib_buffer_pool_get (vlib_main_t * vm, u8 buffer_pool_index, u32 * buffers,
499 vlib_buffer_pool_t *bp = vlib_get_buffer_pool (vm, buffer_pool_index);
502 ASSERT (bp->buffers);
504 clib_spinlock_lock (&bp->lock);
506 if (PREDICT_TRUE (n_buffers < len))
509 vlib_buffer_copy_indices (buffers, bp->buffers + len, n_buffers);
511 clib_spinlock_unlock (&bp->lock);
516 vlib_buffer_copy_indices (buffers, bp->buffers, len);
518 clib_spinlock_unlock (&bp->lock);
524 /** \brief Allocate buffers from specific pool into supplied array
526 @param vm - (vlib_main_t *) vlib main data structure pointer
527 @param buffers - (u32 * ) buffer index array
528 @param n_buffers - (u32) number of buffers requested
529 @return - (u32) number of buffers actually allocated, may be
530 less than the number requested or zero
533 always_inline __clib_warn_unused_result u32
534 vlib_buffer_alloc_from_pool (vlib_main_t * vm, u32 * buffers, u32 n_buffers,
535 u8 buffer_pool_index)
537 vlib_buffer_main_t *bm = vm->buffer_main;
538 vlib_buffer_pool_t *bp;
539 vlib_buffer_pool_thread_t *bpt;
540 u32 *src, *dst, len, n_left;
542 /* If buffer allocation fault injection is configured */
543 if (VLIB_BUFFER_ALLOC_FAULT_INJECTOR > 0)
545 u32 vlib_buffer_alloc_may_fail (vlib_main_t *, u32);
547 /* See how many buffers we're willing to allocate */
548 n_buffers = vlib_buffer_alloc_may_fail (vm, n_buffers);
553 bp = vec_elt_at_index (bm->buffer_pools, buffer_pool_index);
554 bpt = vec_elt_at_index (bp->threads, vm->thread_index);
560 /* per-thread cache contains enough buffers */
561 if (len >= n_buffers)
563 src = bpt->cached_buffers + len - n_buffers;
564 vlib_buffer_copy_indices (dst, src, n_buffers);
565 bpt->n_cached -= n_buffers;
569 /* alloc bigger than cache - take buffers directly from main pool */
570 if (n_buffers >= VLIB_BUFFER_POOL_PER_THREAD_CACHE_SZ)
572 n_buffers = vlib_buffer_pool_get (vm, buffer_pool_index, buffers,
577 /* take everything available in the cache */
580 vlib_buffer_copy_indices (dst, bpt->cached_buffers, len);
586 len = round_pow2 (n_left, 32);
587 len = vlib_buffer_pool_get (vm, buffer_pool_index, bpt->cached_buffers,
593 u32 n_copy = clib_min (len, n_left);
594 src = bpt->cached_buffers + len - n_copy;
595 vlib_buffer_copy_indices (dst, src, n_copy);
596 bpt->n_cached -= n_copy;
603 /* Verify that buffers are known free. */
605 vlib_buffer_validate_alloc_free (vm, buffers, n_buffers,
606 VLIB_BUFFER_KNOWN_FREE);
607 if (PREDICT_FALSE (bm->alloc_callback_fn != 0))
608 bm->alloc_callback_fn (vm, buffer_pool_index, buffers, n_buffers);
612 /** \brief Allocate buffers from specific numa node into supplied array
614 @param vm - (vlib_main_t *) vlib main data structure pointer
615 @param buffers - (u32 * ) buffer index array
616 @param n_buffers - (u32) number of buffers requested
617 @param numa_node - (u32) numa node
618 @return - (u32) number of buffers actually allocated, may be
619 less than the number requested or zero
621 always_inline __clib_warn_unused_result u32
622 vlib_buffer_alloc_on_numa (vlib_main_t * vm, u32 * buffers, u32 n_buffers,
625 u8 index = vlib_buffer_pool_get_default_for_numa (vm, numa_node);
626 return vlib_buffer_alloc_from_pool (vm, buffers, n_buffers, index);
629 /** \brief Allocate buffers into supplied array
631 @param vm - (vlib_main_t *) vlib main data structure pointer
632 @param buffers - (u32 * ) buffer index array
633 @param n_buffers - (u32) number of buffers requested
634 @return - (u32) number of buffers actually allocated, may be
635 less than the number requested or zero
638 always_inline __clib_warn_unused_result u32
639 vlib_buffer_alloc (vlib_main_t * vm, u32 * buffers, u32 n_buffers)
641 return vlib_buffer_alloc_on_numa (vm, buffers, n_buffers, vm->numa_node);
644 /** \brief Allocate buffers into ring
646 @param vm - (vlib_main_t *) vlib main data structure pointer
647 @param buffers - (u32 * ) buffer index ring
648 @param start - (u32) first slot in the ring
649 @param ring_size - (u32) ring size
650 @param n_buffers - (u32) number of buffers requested
651 @return - (u32) number of buffers actually allocated, may be
652 less than the number requested or zero
654 always_inline __clib_warn_unused_result u32
655 vlib_buffer_alloc_to_ring (vlib_main_t * vm, u32 * ring, u32 start,
656 u32 ring_size, u32 n_buffers)
660 ASSERT (n_buffers <= ring_size);
662 if (PREDICT_TRUE (start + n_buffers <= ring_size))
663 return vlib_buffer_alloc (vm, ring + start, n_buffers);
665 n_alloc = vlib_buffer_alloc (vm, ring + start, ring_size - start);
667 if (PREDICT_TRUE (n_alloc == ring_size - start))
668 n_alloc += vlib_buffer_alloc (vm, ring, n_buffers - n_alloc);
673 /** \brief Allocate buffers into ring from specific buffer pool
675 @param vm - (vlib_main_t *) vlib main data structure pointer
676 @param buffers - (u32 * ) buffer index ring
677 @param start - (u32) first slot in the ring
678 @param ring_size - (u32) ring size
679 @param n_buffers - (u32) number of buffers requested
680 @return - (u32) number of buffers actually allocated, may be
681 less than the number requested or zero
683 always_inline __clib_warn_unused_result u32
684 vlib_buffer_alloc_to_ring_from_pool (vlib_main_t * vm, u32 * ring, u32 start,
685 u32 ring_size, u32 n_buffers,
686 u8 buffer_pool_index)
690 ASSERT (n_buffers <= ring_size);
692 if (PREDICT_TRUE (start + n_buffers <= ring_size))
693 return vlib_buffer_alloc_from_pool (vm, ring + start, n_buffers,
696 n_alloc = vlib_buffer_alloc_from_pool (vm, ring + start, ring_size - start,
699 if (PREDICT_TRUE (n_alloc == ring_size - start))
700 n_alloc += vlib_buffer_alloc_from_pool (vm, ring, n_buffers - n_alloc,
706 static_always_inline void
707 vlib_buffer_pool_put (vlib_main_t * vm, u8 buffer_pool_index,
708 u32 * buffers, u32 n_buffers)
710 vlib_buffer_main_t *bm = vm->buffer_main;
711 vlib_buffer_pool_t *bp = vlib_get_buffer_pool (vm, buffer_pool_index);
712 vlib_buffer_pool_thread_t *bpt = vec_elt_at_index (bp->threads,
714 u32 n_cached, n_empty;
717 vlib_buffer_validate_alloc_free (vm, buffers, n_buffers,
718 VLIB_BUFFER_KNOWN_ALLOCATED);
719 if (PREDICT_FALSE (bm->free_callback_fn != 0))
720 bm->free_callback_fn (vm, buffer_pool_index, buffers, n_buffers);
722 n_cached = bpt->n_cached;
723 n_empty = VLIB_BUFFER_POOL_PER_THREAD_CACHE_SZ - n_cached;
724 if (n_buffers <= n_empty)
726 vlib_buffer_copy_indices (bpt->cached_buffers + n_cached,
728 bpt->n_cached = n_cached + n_buffers;
732 vlib_buffer_copy_indices (bpt->cached_buffers + n_cached,
733 buffers + n_buffers - n_empty, n_empty);
734 bpt->n_cached = VLIB_BUFFER_POOL_PER_THREAD_CACHE_SZ;
736 clib_spinlock_lock (&bp->lock);
737 vlib_buffer_copy_indices (bp->buffers + bp->n_avail, buffers,
738 n_buffers - n_empty);
739 bp->n_avail += n_buffers - n_empty;
740 clib_spinlock_unlock (&bp->lock);
743 static_always_inline void
744 vlib_buffer_free_inline (vlib_main_t * vm, u32 * buffers, u32 n_buffers,
747 const int queue_size = 128;
748 vlib_buffer_pool_t *bp = 0;
749 u8 buffer_pool_index = ~0;
750 u32 n_queue = 0, queue[queue_size + 4];
751 vlib_buffer_t bt = { };
752 #if defined(CLIB_HAVE_VEC128)
753 vlib_buffer_t bpi_mask = {.buffer_pool_index = ~0 };
754 vlib_buffer_t bpi_vec = {};
755 vlib_buffer_t flags_refs_mask = {
756 .flags = VLIB_BUFFER_NEXT_PRESENT,
761 if (PREDICT_FALSE (n_buffers == 0))
764 vlib_buffer_t *b = vlib_get_buffer (vm, buffers[0]);
765 buffer_pool_index = b->buffer_pool_index;
766 bp = vlib_get_buffer_pool (vm, buffer_pool_index);
767 vlib_buffer_copy_template (&bt, &bp->buffer_template);
768 #if defined(CLIB_HAVE_VEC128)
769 bpi_vec.buffer_pool_index = buffer_pool_index;
775 u32 bi, sum = 0, flags, next;
780 vlib_get_buffers (vm, buffers, b, 4);
784 vlib_get_buffers (vm, buffers + 8, b + 4, 4);
785 vlib_prefetch_buffer_header (b[4], LOAD);
786 vlib_prefetch_buffer_header (b[5], LOAD);
787 vlib_prefetch_buffer_header (b[6], LOAD);
788 vlib_prefetch_buffer_header (b[7], LOAD);
791 #if defined(CLIB_HAVE_VEC128)
792 u8x16 p0, p1, p2, p3, r;
793 p0 = u8x16_load_unaligned (b[0]);
794 p1 = u8x16_load_unaligned (b[1]);
795 p2 = u8x16_load_unaligned (b[2]);
796 p3 = u8x16_load_unaligned (b[3]);
798 r = p0 ^ bpi_vec.as_u8x16[0];
799 r |= p1 ^ bpi_vec.as_u8x16[0];
800 r |= p2 ^ bpi_vec.as_u8x16[0];
801 r |= p3 ^ bpi_vec.as_u8x16[0];
802 r &= bpi_mask.as_u8x16[0];
803 r |= (p0 | p1 | p2 | p3) & flags_refs_mask.as_u8x16[0];
805 sum = !u8x16_is_all_zero (r);
811 sum &= VLIB_BUFFER_NEXT_PRESENT;
812 sum += b[0]->ref_count - 1;
813 sum += b[1]->ref_count - 1;
814 sum += b[2]->ref_count - 1;
815 sum += b[3]->ref_count - 1;
816 sum |= b[0]->buffer_pool_index ^ buffer_pool_index;
817 sum |= b[1]->buffer_pool_index ^ buffer_pool_index;
818 sum |= b[2]->buffer_pool_index ^ buffer_pool_index;
819 sum |= b[3]->buffer_pool_index ^ buffer_pool_index;
825 vlib_buffer_copy_indices (queue + n_queue, buffers, 4);
826 vlib_buffer_copy_template (b[0], &bt);
827 vlib_buffer_copy_template (b[1], &bt);
828 vlib_buffer_copy_template (b[2], &bt);
829 vlib_buffer_copy_template (b[3], &bt);
832 vlib_buffer_validate (vm, b[0]);
833 vlib_buffer_validate (vm, b[1]);
834 vlib_buffer_validate (vm, b[2]);
835 vlib_buffer_validate (vm, b[3]);
837 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[0]);
838 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[1]);
839 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[2]);
840 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[3]);
842 if (n_queue >= queue_size)
844 vlib_buffer_pool_put (vm, buffer_pool_index, queue, n_queue);
855 b[0] = vlib_get_buffer (vm, bi);
857 next = b[0]->next_buffer;
859 if (PREDICT_FALSE (buffer_pool_index != b[0]->buffer_pool_index))
864 vlib_buffer_pool_put (vm, buffer_pool_index, queue, n_queue);
868 buffer_pool_index = b[0]->buffer_pool_index;
869 #if defined(CLIB_HAVE_VEC128)
870 bpi_vec.buffer_pool_index = buffer_pool_index;
872 bp = vlib_get_buffer_pool (vm, buffer_pool_index);
873 vlib_buffer_copy_template (&bt, &bp->buffer_template);
876 vlib_buffer_validate (vm, b[0]);
878 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[0]);
880 if (clib_atomic_sub_fetch (&b[0]->ref_count, 1) == 0)
882 vlib_buffer_copy_template (b[0], &bt);
883 queue[n_queue++] = bi;
886 if (n_queue == queue_size)
888 vlib_buffer_pool_put (vm, buffer_pool_index, queue, queue_size);
892 if (maybe_next && (flags & VLIB_BUFFER_NEXT_PRESENT))
903 vlib_buffer_pool_put (vm, buffer_pool_index, queue, n_queue);
907 /** \brief Free buffers
908 Frees the entire buffer chain for each buffer
910 @param vm - (vlib_main_t *) vlib main data structure pointer
911 @param buffers - (u32 * ) buffer index array
912 @param n_buffers - (u32) number of buffers to free
916 vlib_buffer_free (vlib_main_t * vm,
917 /* pointer to first buffer */
919 /* number of buffers to free */
922 vlib_buffer_free_inline (vm, buffers, n_buffers, /* maybe next */ 1);
925 /** \brief Free buffers, does not free the buffer chain for each buffer
927 @param vm - (vlib_main_t *) vlib main data structure pointer
928 @param buffers - (u32 * ) buffer index array
929 @param n_buffers - (u32) number of buffers to free
933 vlib_buffer_free_no_next (vlib_main_t * vm,
934 /* pointer to first buffer */
936 /* number of buffers to free */
939 vlib_buffer_free_inline (vm, buffers, n_buffers, /* maybe next */ 0);
942 /** \brief Free one buffer
943 Shorthand to free a single buffer chain.
945 @param vm - (vlib_main_t *) vlib main data structure pointer
946 @param buffer_index - (u32) buffer index to free
949 vlib_buffer_free_one (vlib_main_t * vm, u32 buffer_index)
951 vlib_buffer_free_inline (vm, &buffer_index, 1, /* maybe next */ 1);
954 /** \brief Free buffers from ring
956 @param vm - (vlib_main_t *) vlib main data structure pointer
957 @param buffers - (u32 * ) buffer index ring
958 @param start - (u32) first slot in the ring
959 @param ring_size - (u32) ring size
960 @param n_buffers - (u32) number of buffers
963 vlib_buffer_free_from_ring (vlib_main_t * vm, u32 * ring, u32 start,
964 u32 ring_size, u32 n_buffers)
966 ASSERT (n_buffers <= ring_size);
968 if (PREDICT_TRUE (start + n_buffers <= ring_size))
970 vlib_buffer_free (vm, ring + start, n_buffers);
974 vlib_buffer_free (vm, ring + start, ring_size - start);
975 vlib_buffer_free (vm, ring, n_buffers - (ring_size - start));
979 /** \brief Free buffers from ring without freeing tail buffers
981 @param vm - (vlib_main_t *) vlib main data structure pointer
982 @param buffers - (u32 * ) buffer index ring
983 @param start - (u32) first slot in the ring
984 @param ring_size - (u32) ring size
985 @param n_buffers - (u32) number of buffers
988 vlib_buffer_free_from_ring_no_next (vlib_main_t * vm, u32 * ring, u32 start,
989 u32 ring_size, u32 n_buffers)
991 ASSERT (n_buffers <= ring_size);
993 if (PREDICT_TRUE (start + n_buffers <= ring_size))
995 vlib_buffer_free_no_next (vm, ring + start, n_buffers);
999 vlib_buffer_free_no_next (vm, ring + start, ring_size - start);
1000 vlib_buffer_free_no_next (vm, ring, n_buffers - (ring_size - start));
1004 /* Append given data to end of buffer, possibly allocating new buffers. */
1005 int vlib_buffer_add_data (vlib_main_t * vm, u32 * buffer_index, void *data,
1008 /* Define vlib_buffer and vnet_buffer flags bits preserved for copy/clone */
1009 #define VLIB_BUFFER_COPY_CLONE_FLAGS_MASK \
1010 (VLIB_BUFFER_NEXT_PRESENT | VLIB_BUFFER_TOTAL_LENGTH_VALID | \
1011 VLIB_BUFFER_IS_TRACED | ~VLIB_BUFFER_FLAGS_ALL)
1013 /* duplicate all buffers in chain */
1014 always_inline vlib_buffer_t *
1015 vlib_buffer_copy (vlib_main_t * vm, vlib_buffer_t * b)
1017 vlib_buffer_t *s, *d, *fd;
1018 uword n_alloc, n_buffers = 1;
1019 u32 flag_mask = VLIB_BUFFER_COPY_CLONE_FLAGS_MASK;
1023 while (s->flags & VLIB_BUFFER_NEXT_PRESENT)
1026 s = vlib_get_buffer (vm, s->next_buffer);
1028 u32 new_buffers[n_buffers];
1030 n_alloc = vlib_buffer_alloc (vm, new_buffers, n_buffers);
1032 /* No guarantee that we'll get all the buffers we asked for */
1033 if (PREDICT_FALSE (n_alloc < n_buffers))
1036 vlib_buffer_free (vm, new_buffers, n_alloc);
1042 fd = d = vlib_get_buffer (vm, new_buffers[0]);
1043 d->current_data = s->current_data;
1044 d->current_length = s->current_length;
1045 d->flags = s->flags & flag_mask;
1046 d->trace_handle = s->trace_handle;
1047 d->total_length_not_including_first_buffer =
1048 s->total_length_not_including_first_buffer;
1049 clib_memcpy_fast (d->opaque, s->opaque, sizeof (s->opaque));
1050 clib_memcpy_fast (d->opaque2, s->opaque2, sizeof (s->opaque2));
1051 clib_memcpy_fast (vlib_buffer_get_current (d),
1052 vlib_buffer_get_current (s), s->current_length);
1055 for (i = 1; i < n_buffers; i++)
1058 d->next_buffer = new_buffers[i];
1060 s = vlib_get_buffer (vm, s->next_buffer);
1061 d = vlib_get_buffer (vm, new_buffers[i]);
1062 d->current_data = s->current_data;
1063 d->current_length = s->current_length;
1064 clib_memcpy_fast (vlib_buffer_get_current (d),
1065 vlib_buffer_get_current (s), s->current_length);
1066 d->flags = s->flags & flag_mask;
1072 /* duplicate first buffer in chain */
1073 always_inline vlib_buffer_t *
1074 vlib_buffer_copy_no_chain (vlib_main_t * vm, vlib_buffer_t * b, u32 * di)
1078 if ((vlib_buffer_alloc (vm, di, 1)) != 1)
1081 d = vlib_get_buffer (vm, *di);
1083 d->current_data = b->current_data;
1084 d->current_length = b->current_length;
1085 clib_memcpy_fast (d->opaque, b->opaque, sizeof (b->opaque));
1086 clib_memcpy_fast (d->opaque2, b->opaque2, sizeof (b->opaque2));
1087 clib_memcpy_fast (vlib_buffer_get_current (d),
1088 vlib_buffer_get_current (b), b->current_length);
1093 /* \brief Move packet from current position to offset position in buffer.
1094 Only work for small packet using one buffer with room to fit the move
1095 @param vm - (vlib_main_t *) vlib main data structure pointer
1096 @param b - (vlib_buffer_t *) pointer to buffer
1097 @param offset - (i16) position to move the packet in buffer
1100 vlib_buffer_move (vlib_main_t * vm, vlib_buffer_t * b, i16 offset)
1102 ASSERT ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0);
1103 ASSERT (offset + VLIB_BUFFER_PRE_DATA_SIZE >= 0);
1104 ASSERT (offset + b->current_length <
1105 vlib_buffer_get_default_data_size (vm));
1107 u8 *source = vlib_buffer_get_current (b);
1108 b->current_data = offset;
1109 u8 *destination = vlib_buffer_get_current (b);
1110 u16 length = b->current_length;
1112 if (source + length <= destination) /* no overlap */
1113 clib_memcpy_fast (destination, source, length);
1115 memmove (destination, source, length);
1118 /** \brief Create a maximum of 256 clones of buffer and store them
1119 in the supplied array
1121 @param vm - (vlib_main_t *) vlib main data structure pointer
1122 @param src_buffer - (u32) source buffer index
1123 @param buffers - (u32 * ) buffer index array
1124 @param n_buffers - (u16) number of buffer clones requested (<=256)
1125 @param head_end_offset - (u16) offset relative to current position
1126 where packet head ends
1127 @param offset - (i16) copy packet head at current position if 0,
1128 else at offset position to change headroom space as specified
1129 @return - (u16) number of buffers actually cloned, may be
1130 less than the number requested or zero
1133 vlib_buffer_clone_256 (vlib_main_t * vm, u32 src_buffer, u32 * buffers,
1134 u16 n_buffers, u16 head_end_offset, i16 offset)
1137 vlib_buffer_t *s = vlib_get_buffer (vm, src_buffer);
1139 ASSERT (s->ref_count == 1);
1141 ASSERT (n_buffers <= 256);
1142 ASSERT (offset + VLIB_BUFFER_PRE_DATA_SIZE >= 0);
1143 ASSERT ((offset + head_end_offset) <
1144 vlib_buffer_get_default_data_size (vm));
1146 if (s->current_length <= head_end_offset + CLIB_CACHE_LINE_BYTES * 2)
1148 buffers[0] = src_buffer;
1150 vlib_buffer_move (vm, s, offset);
1152 for (i = 1; i < n_buffers; i++)
1155 d = vlib_buffer_copy (vm, s);
1158 buffers[i] = vlib_get_buffer_index (vm, d);
1164 if (PREDICT_FALSE ((n_buffers == 1) && (offset == 0)))
1166 buffers[0] = src_buffer;
1170 n_buffers = vlib_buffer_alloc_from_pool (vm, buffers, n_buffers,
1171 s->buffer_pool_index);
1173 for (i = 0; i < n_buffers; i++)
1175 vlib_buffer_t *d = vlib_get_buffer (vm, buffers[i]);
1177 d->current_data = offset;
1179 d->current_data = s->current_data;
1181 d->current_length = head_end_offset;
1182 ASSERT (d->buffer_pool_index == s->buffer_pool_index);
1184 d->total_length_not_including_first_buffer = s->current_length -
1186 if (PREDICT_FALSE (s->flags & VLIB_BUFFER_NEXT_PRESENT))
1188 d->total_length_not_including_first_buffer +=
1189 s->total_length_not_including_first_buffer;
1191 d->flags = (s->flags & VLIB_BUFFER_COPY_CLONE_FLAGS_MASK) |
1192 VLIB_BUFFER_NEXT_PRESENT;
1193 d->trace_handle = s->trace_handle;
1194 clib_memcpy_fast (d->opaque, s->opaque, sizeof (s->opaque));
1195 clib_memcpy_fast (d->opaque2, s->opaque2, sizeof (s->opaque2));
1196 clib_memcpy_fast (vlib_buffer_get_current (d),
1197 vlib_buffer_get_current (s), head_end_offset);
1198 d->next_buffer = src_buffer;
1200 vlib_buffer_advance (s, head_end_offset);
1201 s->ref_count = n_buffers ? n_buffers : s->ref_count;
1202 while (s->flags & VLIB_BUFFER_NEXT_PRESENT)
1204 s = vlib_get_buffer (vm, s->next_buffer);
1205 s->ref_count = n_buffers ? n_buffers : s->ref_count;
1211 /** \brief Create multiple clones of buffer and store them
1212 in the supplied array
1214 @param vm - (vlib_main_t *) vlib main data structure pointer
1215 @param src_buffer - (u32) source buffer index
1216 @param buffers - (u32 * ) buffer index array
1217 @param n_buffers - (u16) number of buffer clones requested (<=256)
1218 @param head_end_offset - (u16) offset relative to current position
1219 where packet head ends
1220 @param offset - (i16) copy packet head at current position if 0,
1221 else at offset position to change headroom space as specified
1222 @return - (u16) number of buffers actually cloned, may be
1223 less than the number requested or zero
1226 vlib_buffer_clone_at_offset (vlib_main_t * vm, u32 src_buffer, u32 * buffers,
1227 u16 n_buffers, u16 head_end_offset, i16 offset)
1229 vlib_buffer_t *s = vlib_get_buffer (vm, src_buffer);
1232 while (n_buffers > 256)
1234 vlib_buffer_t *copy;
1235 copy = vlib_buffer_copy (vm, s);
1236 n_cloned += vlib_buffer_clone_256 (vm,
1237 vlib_get_buffer_index (vm, copy),
1238 (buffers + n_cloned),
1239 256, head_end_offset, offset);
1242 n_cloned += vlib_buffer_clone_256 (vm, src_buffer,
1244 n_buffers, head_end_offset, offset);
1249 /** \brief Create multiple clones of buffer and store them
1250 in the supplied array
1252 @param vm - (vlib_main_t *) vlib main data structure pointer
1253 @param src_buffer - (u32) source buffer index
1254 @param buffers - (u32 * ) buffer index array
1255 @param n_buffers - (u16) number of buffer clones requested (<=256)
1256 @param head_end_offset - (u16) offset relative to current position
1257 where packet head ends
1258 @return - (u16) number of buffers actually cloned, may be
1259 less than the number requested or zero
1262 vlib_buffer_clone (vlib_main_t * vm, u32 src_buffer, u32 * buffers,
1263 u16 n_buffers, u16 head_end_offset)
1265 return vlib_buffer_clone_at_offset (vm, src_buffer, buffers, n_buffers,
1266 head_end_offset, 0);
1269 /** \brief Attach cloned tail to the buffer
1271 @param vm - (vlib_main_t *) vlib main data structure pointer
1272 @param head - (vlib_buffer_t *) head buffer
1273 @param tail - (Vlib buffer_t *) tail buffer to clone and attach to head
1277 vlib_buffer_attach_clone (vlib_main_t * vm, vlib_buffer_t * head,
1278 vlib_buffer_t * tail)
1280 ASSERT ((head->flags & VLIB_BUFFER_NEXT_PRESENT) == 0);
1281 ASSERT (head->buffer_pool_index == tail->buffer_pool_index);
1283 head->flags |= VLIB_BUFFER_NEXT_PRESENT;
1284 head->flags &= ~VLIB_BUFFER_TOTAL_LENGTH_VALID;
1285 head->flags &= ~VLIB_BUFFER_EXT_HDR_VALID;
1286 head->flags |= (tail->flags & VLIB_BUFFER_TOTAL_LENGTH_VALID);
1287 head->next_buffer = vlib_get_buffer_index (vm, tail);
1288 head->total_length_not_including_first_buffer = tail->current_length +
1289 tail->total_length_not_including_first_buffer;
1292 clib_atomic_add_fetch (&tail->ref_count, 1);
1294 if (tail->flags & VLIB_BUFFER_NEXT_PRESENT)
1296 tail = vlib_get_buffer (vm, tail->next_buffer);
1301 /* Initializes the buffer as an empty packet with no chained buffers. */
1303 vlib_buffer_chain_init (vlib_buffer_t * first)
1305 first->total_length_not_including_first_buffer = 0;
1306 first->current_length = 0;
1307 first->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
1308 first->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
1311 /* The provided next_bi buffer index is appended to the end of the packet. */
1312 always_inline vlib_buffer_t *
1313 vlib_buffer_chain_buffer (vlib_main_t * vm, vlib_buffer_t * last, u32 next_bi)
1315 vlib_buffer_t *next_buffer = vlib_get_buffer (vm, next_bi);
1316 last->next_buffer = next_bi;
1317 last->flags |= VLIB_BUFFER_NEXT_PRESENT;
1318 next_buffer->current_length = 0;
1319 next_buffer->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
1323 /* Increases or decreases the packet length.
1324 * It does not allocate or deallocate new buffers.
1325 * Therefore, the added length must be compatible
1326 * with the last buffer. */
1328 vlib_buffer_chain_increase_length (vlib_buffer_t * first,
1329 vlib_buffer_t * last, i32 len)
1331 last->current_length += len;
1333 first->total_length_not_including_first_buffer += len;
1336 /* Copy data to the end of the packet and increases its length.
1337 * It does not allocate new buffers.
1338 * Returns the number of copied bytes. */
1340 vlib_buffer_chain_append_data (vlib_main_t * vm,
1341 vlib_buffer_t * first,
1342 vlib_buffer_t * last, void *data, u16 data_len)
1344 u32 n_buffer_bytes = vlib_buffer_get_default_data_size (vm);
1345 ASSERT (n_buffer_bytes >= last->current_length + last->current_data);
1346 u16 len = clib_min (data_len,
1347 n_buffer_bytes - last->current_length -
1348 last->current_data);
1349 clib_memcpy_fast (vlib_buffer_get_current (last) + last->current_length,
1351 vlib_buffer_chain_increase_length (first, last, len);
1355 /* Copy data to the end of the packet and increases its length.
1356 * Allocates additional buffers from the free list if necessary.
1357 * Returns the number of copied bytes.
1358 * 'last' value is modified whenever new buffers are allocated and
1359 * chained and points to the last buffer in the chain. */
1361 vlib_buffer_chain_append_data_with_alloc (vlib_main_t * vm,
1362 vlib_buffer_t * first,
1363 vlib_buffer_t ** last, void *data,
1365 void vlib_buffer_chain_validate (vlib_main_t * vm, vlib_buffer_t * first);
1367 format_function_t format_vlib_buffer, format_vlib_buffer_and_data,
1368 format_vlib_buffer_contents, format_vlib_buffer_no_chain;
1372 /* Vector of packet data. */
1375 /* Number of buffers to allocate in each call to allocator. */
1376 u32 min_n_buffers_each_alloc;
1379 } vlib_packet_template_t;
1381 void vlib_packet_template_init (vlib_main_t * vm,
1382 vlib_packet_template_t * t,
1384 uword n_packet_data_bytes,
1385 uword min_n_buffers_each_alloc,
1388 void *vlib_packet_template_get_packet (vlib_main_t * vm,
1389 vlib_packet_template_t * t,
1393 vlib_packet_template_free (vlib_main_t * vm, vlib_packet_template_t * t)
1395 vec_free (t->packet_data);
1399 vlib_buffer_space_left_at_end (vlib_main_t * vm, vlib_buffer_t * b)
1401 return b->data + vlib_buffer_get_default_data_size (vm) -
1402 ((u8 *) vlib_buffer_get_current (b) + b->current_length);
1405 #define VLIB_BUFFER_LINEARIZE_MAX 64
1408 vlib_buffer_chain_linearize (vlib_main_t * vm, vlib_buffer_t * b)
1410 vlib_buffer_t *dst_b;
1411 u32 n_buffers = 1, to_free = 0;
1412 u16 rem_len, dst_len, data_size, src_len = 0;
1415 if (PREDICT_TRUE ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0))
1418 ASSERT (1 == b->ref_count);
1419 if (PREDICT_FALSE (1 != b->ref_count))
1422 data_size = vlib_buffer_get_default_data_size (vm);
1423 rem_len = vlib_buffer_length_in_chain (vm, b) - b->current_length;
1426 dst = vlib_buffer_get_tail (dst_b);
1427 dst_len = vlib_buffer_space_left_at_end (vm, dst_b);
1429 b->total_length_not_including_first_buffer -= dst_len;
1435 while (0 == src_len)
1437 ASSERT (b->flags & VLIB_BUFFER_NEXT_PRESENT);
1438 if (PREDICT_FALSE (!(b->flags & VLIB_BUFFER_NEXT_PRESENT)))
1439 break; /* malformed chained buffer */
1441 b = vlib_get_buffer (vm, b->next_buffer);
1442 src = vlib_buffer_get_current (b);
1443 src_len = b->current_length;
1448 ASSERT (dst_b->flags & VLIB_BUFFER_NEXT_PRESENT);
1449 if (PREDICT_FALSE (!(dst_b->flags & VLIB_BUFFER_NEXT_PRESENT)))
1450 break; /* malformed chained buffer */
1452 vlib_buffer_t *next_dst_b = vlib_get_buffer (vm, dst_b->next_buffer);
1454 if (PREDICT_TRUE (1 == next_dst_b->ref_count))
1456 /* normal case: buffer is not cloned, just use it */
1461 /* cloned buffer, build a new dest chain from there */
1462 vlib_buffer_t *bufs[VLIB_BUFFER_LINEARIZE_MAX];
1463 u32 bis[VLIB_BUFFER_LINEARIZE_MAX + 1];
1464 const int n = (rem_len + data_size - 1) / data_size;
1468 ASSERT (n <= VLIB_BUFFER_LINEARIZE_MAX);
1469 if (PREDICT_FALSE (n > VLIB_BUFFER_LINEARIZE_MAX))
1472 n_alloc = vlib_buffer_alloc (vm, bis, n);
1473 if (PREDICT_FALSE (n_alloc != n))
1475 vlib_buffer_free (vm, bis, n_alloc);
1479 vlib_get_buffers (vm, bis, bufs, n);
1481 for (i = 0; i < n - 1; i++)
1483 bufs[i]->flags |= VLIB_BUFFER_NEXT_PRESENT;
1484 bufs[i]->next_buffer = bis[i + 1];
1487 to_free = dst_b->next_buffer;
1488 dst_b->next_buffer = bis[0];
1494 dst_b->current_data = clib_min (0, dst_b->current_data);
1495 dst_b->current_length = 0;
1497 dst = dst_b->data + dst_b->current_data;
1498 dst_len = data_size - dst_b->current_data;
1501 copy_len = clib_min (src_len, dst_len);
1503 if (PREDICT_TRUE (src == dst))
1507 else if (src + copy_len > dst && dst + copy_len > src)
1509 /* src and dst overlap */
1510 ASSERT (b == dst_b);
1511 memmove (dst, src, copy_len);
1515 clib_memcpy_fast (dst, src, copy_len);
1518 dst_b->current_length += copy_len;
1522 dst_len -= copy_len;
1523 src_len -= copy_len;
1524 rem_len -= copy_len;
1527 /* in case of a malformed chain buffer, we'll exit early from the loop. */
1528 ASSERT (0 == rem_len);
1529 b->total_length_not_including_first_buffer -= rem_len;
1532 vlib_buffer_free_one (vm, to_free);
1534 if (dst_b->flags & VLIB_BUFFER_NEXT_PRESENT)
1536 /* the resulting chain is smaller than the original, cut it there */
1537 dst_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
1538 vlib_buffer_free_one (vm, dst_b->next_buffer);
1541 /* no longer a chained buffer */
1542 dst_b->flags &= ~VLIB_BUFFER_TOTAL_LENGTH_VALID;
1543 dst_b->total_length_not_including_first_buffer = 0;
1550 #endif /* included_vlib_buffer_funcs_h */
1553 * fd.io coding-style-patch-verification: ON
1556 * eval: (c-set-style "gnu")