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_buffer_enqueue_to_thread_with_aux_fn_t) (
69 vlib_main_t *vm, vlib_node_runtime_t *node, u32 frame_queue_index,
70 u32 *buffer_indices, u32 *aux, u16 *thread_indices, u32 n_packets,
71 int drop_on_congestion);
75 vlib_buffer_enqueue_to_next_fn_t *buffer_enqueue_to_next_fn;
76 vlib_buffer_enqueue_to_single_next_fn_t *buffer_enqueue_to_single_next_fn;
77 vlib_buffer_enqueue_to_thread_fn_t *buffer_enqueue_to_thread_fn;
78 vlib_buffer_enqueue_to_thread_with_aux_fn_t
79 *buffer_enqueue_to_thread_with_aux_fn;
80 } vlib_buffer_func_main_t;
82 extern vlib_buffer_func_main_t vlib_buffer_func_main;
85 vlib_buffer_validate (vlib_main_t * vm, vlib_buffer_t * b)
87 vlib_buffer_main_t *bm = vm->buffer_main;
88 vlib_buffer_pool_t *bp;
90 /* reference count in allocated buffer always must be 1 or higher */
91 ASSERT (b->ref_count > 0);
93 /* verify that buffer pool index is valid */
94 bp = vec_elt_at_index (bm->buffer_pools, b->buffer_pool_index);
95 ASSERT (pointer_to_uword (b) >= bp->start);
96 ASSERT (pointer_to_uword (b) < bp->start + bp->size -
97 (bp->data_size + sizeof (vlib_buffer_t)));
101 vlib_buffer_ptr_from_index (uword buffer_mem_start, u32 buffer_index,
104 offset += ((uword) buffer_index) << CLIB_LOG2_CACHE_LINE_BYTES;
105 return uword_to_pointer (buffer_mem_start + offset, vlib_buffer_t *);
108 /** \brief Translate buffer index into buffer pointer
110 @param vm - (vlib_main_t *) vlib main data structure pointer
111 @param buffer_index - (u32) buffer index
112 @return - (vlib_buffer_t *) buffer pointer
114 always_inline vlib_buffer_t *
115 vlib_get_buffer (vlib_main_t * vm, u32 buffer_index)
117 vlib_buffer_main_t *bm = vm->buffer_main;
120 b = vlib_buffer_ptr_from_index (bm->buffer_mem_start, buffer_index, 0);
121 vlib_buffer_validate (vm, b);
125 static_always_inline u32
126 vlib_buffer_get_default_data_size (vlib_main_t * vm)
128 return vm->buffer_main->default_data_size;
131 static_always_inline void
132 vlib_buffer_copy_indices (u32 * dst, u32 * src, u32 n_indices)
134 clib_memcpy_u32 (dst, src, n_indices);
138 vlib_buffer_copy_indices_from_ring (u32 * dst, u32 * ring, u32 start,
139 u32 ring_size, u32 n_buffers)
141 ASSERT (n_buffers <= ring_size);
143 if (PREDICT_TRUE (start + n_buffers <= ring_size))
145 vlib_buffer_copy_indices (dst, ring + start, n_buffers);
149 u32 n = ring_size - start;
150 vlib_buffer_copy_indices (dst, ring + start, n);
151 vlib_buffer_copy_indices (dst + n, ring, n_buffers - n);
156 vlib_buffer_copy_indices_to_ring (u32 * ring, u32 * src, u32 start,
157 u32 ring_size, u32 n_buffers)
159 ASSERT (n_buffers <= ring_size);
161 if (PREDICT_TRUE (start + n_buffers <= ring_size))
163 vlib_buffer_copy_indices (ring + start, src, n_buffers);
167 u32 n = ring_size - start;
168 vlib_buffer_copy_indices (ring + start, src, n);
169 vlib_buffer_copy_indices (ring, src + n, n_buffers - n);
173 STATIC_ASSERT_OFFSET_OF (vlib_buffer_t, template_end, 64);
174 static_always_inline void
175 vlib_buffer_copy_template (vlib_buffer_t * b, vlib_buffer_t * bt)
177 #if defined CLIB_HAVE_VEC512
178 b->as_u8x64[0] = bt->as_u8x64[0];
179 #elif defined (CLIB_HAVE_VEC256)
180 b->as_u8x32[0] = bt->as_u8x32[0];
181 b->as_u8x32[1] = bt->as_u8x32[1];
182 #elif defined (CLIB_HAVE_VEC128)
183 b->as_u8x16[0] = bt->as_u8x16[0];
184 b->as_u8x16[1] = bt->as_u8x16[1];
185 b->as_u8x16[2] = bt->as_u8x16[2];
186 b->as_u8x16[3] = bt->as_u8x16[3];
188 clib_memcpy_fast (b, bt, 64);
193 vlib_buffer_pool_get_default_for_numa (vlib_main_t * vm, u32 numa_node)
195 ASSERT (numa_node < VLIB_BUFFER_MAX_NUMA_NODES);
196 return vm->buffer_main->default_buffer_pool_index_for_numa[numa_node];
199 /** \brief Translate array of buffer indices into buffer pointers with offset
201 @param vm - (vlib_main_t *) vlib main data structure pointer
202 @param bi - (u32 *) array of buffer indices
203 @param b - (void **) array to store buffer pointers
204 @param count - (uword) number of elements
205 @param offset - (i32) offset applied to each pointer
207 static_always_inline void
208 vlib_get_buffers_with_offset (vlib_main_t *vm, u32 *bi, void **b, u32 count,
211 uword buffer_mem_start = vm->buffer_main->buffer_mem_start;
212 void *base = (void *) (buffer_mem_start + offset);
213 int objsize = __builtin_object_size (b, 0);
214 const int sh = CLIB_LOG2_CACHE_LINE_BYTES;
216 if (COMPILE_TIME_CONST (count) == 0 && objsize >= 64 * sizeof (b[0]) &&
217 (objsize & ((8 * sizeof (b[0])) - 1)) == 0)
219 u32 n = round_pow2 (count, 8);
220 ASSERT (objsize >= count);
221 CLIB_ASSUME (objsize >= count);
224 clib_index_to_ptr_u32 (bi, base, sh, b, 64);
232 clib_index_to_ptr_u32 (bi, base, sh, b, 8);
239 clib_index_to_ptr_u32 (bi, base, sh, b, count);
242 /** \brief Translate array of buffer indices into buffer pointers
244 @param vm - (vlib_main_t *) vlib main data structure pointer
245 @param bi - (u32 *) array of buffer indices
246 @param b - (vlib_buffer_t **) array to store buffer pointers
247 @param count - (uword) number of elements
250 static_always_inline void
251 vlib_get_buffers (vlib_main_t *vm, u32 *bi, vlib_buffer_t **b, u32 count)
253 vlib_get_buffers_with_offset (vm, bi, (void **) b, count, 0);
256 /** \brief Translate buffer pointer into buffer index
258 @param vm - (vlib_main_t *) vlib main data structure pointer
259 @param p - (void *) buffer pointer
260 @return - (u32) buffer index
264 vlib_get_buffer_index (vlib_main_t * vm, void *p)
266 vlib_buffer_main_t *bm = vm->buffer_main;
267 uword offset = pointer_to_uword (p) - bm->buffer_mem_start;
268 ASSERT (pointer_to_uword (p) >= bm->buffer_mem_start);
269 ASSERT (offset < bm->buffer_mem_size);
270 ASSERT ((offset % (1 << CLIB_LOG2_CACHE_LINE_BYTES)) == 0);
271 return offset >> CLIB_LOG2_CACHE_LINE_BYTES;
274 /** \brief Translate array of buffer pointers into buffer indices with offset
276 @param vm - (vlib_main_t *) vlib main data structure pointer
277 @param b - (void **) array of buffer pointers
278 @param bi - (u32 *) array to store buffer indices
279 @param count - (uword) number of elements
280 @param offset - (i32) offset applied to each pointer
282 static_always_inline void
283 vlib_get_buffer_indices_with_offset (vlib_main_t * vm, void **b, u32 * bi,
284 uword count, i32 offset)
286 #ifdef CLIB_HAVE_VEC256
287 u32x8 mask = { 0, 2, 4, 6, 1, 3, 5, 7 };
288 u64x4 off4 = u64x4_splat (vm->buffer_main->buffer_mem_start - offset);
292 /* load 4 pointers into 256-bit register */
293 u64x4 v0 = u64x4_load_unaligned (b);
294 u64x4 v1 = u64x4_load_unaligned (b + 4);
300 v0 >>= CLIB_LOG2_CACHE_LINE_BYTES;
301 v1 >>= CLIB_LOG2_CACHE_LINE_BYTES;
303 /* permute 256-bit register so lower u32s of each buffer index are
304 * placed into lower 128-bits */
305 v2 = u32x8_permute ((u32x8) v0, mask);
306 v3 = u32x8_permute ((u32x8) v1, mask);
308 /* extract lower 128-bits and save them to the array of buffer indices */
309 u32x4_store_unaligned (u32x8_extract_lo (v2), bi);
310 u32x4_store_unaligned (u32x8_extract_lo (v3), bi + 4);
318 /* equivalent non-nector implementation */
319 bi[0] = vlib_get_buffer_index (vm, ((u8 *) b[0]) + offset);
320 bi[1] = vlib_get_buffer_index (vm, ((u8 *) b[1]) + offset);
321 bi[2] = vlib_get_buffer_index (vm, ((u8 *) b[2]) + offset);
322 bi[3] = vlib_get_buffer_index (vm, ((u8 *) b[3]) + offset);
329 bi[0] = vlib_get_buffer_index (vm, ((u8 *) b[0]) + offset);
336 /** \brief Translate array of buffer pointers into buffer indices
338 @param vm - (vlib_main_t *) vlib main data structure pointer
339 @param b - (vlib_buffer_t **) array of buffer pointers
340 @param bi - (u32 *) array to store buffer indices
341 @param count - (uword) number of elements
343 static_always_inline void
344 vlib_get_buffer_indices (vlib_main_t * vm, vlib_buffer_t ** b, u32 * bi,
347 vlib_get_buffer_indices_with_offset (vm, (void **) b, bi, count, 0);
350 /** \brief Get next buffer in buffer linklist, or zero for end of list.
352 @param vm - (vlib_main_t *) vlib main data structure pointer
353 @param b - (void *) buffer pointer
354 @return - (vlib_buffer_t *) next buffer, or NULL
356 always_inline vlib_buffer_t *
357 vlib_get_next_buffer (vlib_main_t * vm, vlib_buffer_t * b)
359 return (b->flags & VLIB_BUFFER_NEXT_PRESENT
360 ? vlib_get_buffer (vm, b->next_buffer) : 0);
363 uword vlib_buffer_length_in_chain_slow_path (vlib_main_t * vm,
364 vlib_buffer_t * b_first);
366 /** \brief Get length in bytes of the buffer chain
368 @param vm - (vlib_main_t *) vlib main data structure pointer
369 @param b - (void *) buffer pointer
370 @return - (uword) length of buffer chain
373 vlib_buffer_length_in_chain (vlib_main_t * vm, vlib_buffer_t * b)
375 uword len = b->current_length;
377 if (PREDICT_TRUE ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0))
380 if (PREDICT_TRUE (b->flags & VLIB_BUFFER_TOTAL_LENGTH_VALID))
381 return len + b->total_length_not_including_first_buffer;
383 return vlib_buffer_length_in_chain_slow_path (vm, b);
386 /** \brief Get length in bytes of the buffer index buffer chain
388 @param vm - (vlib_main_t *) vlib main data structure pointer
389 @param bi - (u32) buffer index
390 @return - (uword) length of buffer chain
393 vlib_buffer_index_length_in_chain (vlib_main_t * vm, u32 bi)
395 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
396 return vlib_buffer_length_in_chain (vm, b);
399 /** \brief Copy buffer contents to memory
401 @param vm - (vlib_main_t *) vlib main data structure pointer
402 @param buffer_index - (u32) buffer index
403 @param contents - (u8 *) memory, <strong>must be large enough</strong>
404 @return - (uword) length of buffer chain
407 vlib_buffer_contents (vlib_main_t * vm, u32 buffer_index, u8 * contents)
409 uword content_len = 0;
415 b = vlib_get_buffer (vm, buffer_index);
416 l = b->current_length;
417 clib_memcpy_fast (contents + content_len, b->data + b->current_data, l);
419 if (!(b->flags & VLIB_BUFFER_NEXT_PRESENT))
421 buffer_index = b->next_buffer;
428 vlib_buffer_get_pa (vlib_main_t * vm, vlib_buffer_t * b)
430 return vlib_physmem_get_pa (vm, b->data);
434 vlib_buffer_get_current_pa (vlib_main_t * vm, vlib_buffer_t * b)
436 return vlib_buffer_get_pa (vm, b) + b->current_data;
439 /** \brief Prefetch buffer metadata by buffer index
440 The first 64 bytes of buffer contains most header information
442 @param vm - (vlib_main_t *) vlib main data structure pointer
443 @param bi - (u32) buffer index
444 @param type - LOAD, STORE. In most cases, STORE is the right answer
446 /* Prefetch buffer header given index. */
447 #define vlib_prefetch_buffer_with_index(vm,bi,type) \
449 vlib_buffer_t * _b = vlib_get_buffer (vm, bi); \
450 vlib_prefetch_buffer_header (_b, type); \
455 /* Index is unknown. */
458 /* Index is known and free/allocated. */
459 VLIB_BUFFER_KNOWN_FREE,
460 VLIB_BUFFER_KNOWN_ALLOCATED,
461 } vlib_buffer_known_state_t;
463 void vlib_buffer_validate_alloc_free (vlib_main_t * vm, u32 * buffers,
465 vlib_buffer_known_state_t
468 always_inline vlib_buffer_known_state_t
469 vlib_buffer_is_known (vlib_main_t * vm, u32 buffer_index)
471 vlib_buffer_main_t *bm = vm->buffer_main;
473 clib_spinlock_lock (&bm->buffer_known_hash_lockp);
474 uword *p = hash_get (bm->buffer_known_hash, buffer_index);
475 clib_spinlock_unlock (&bm->buffer_known_hash_lockp);
476 return p ? p[0] : VLIB_BUFFER_UNKNOWN;
479 /* Validates sanity of a single buffer.
480 Returns format'ed vector with error message if any. */
481 u8 *vlib_validate_buffer (vlib_main_t * vm, u32 buffer_index,
484 u8 *vlib_validate_buffers (vlib_main_t * vm,
486 uword next_buffer_stride,
488 vlib_buffer_known_state_t known_state,
489 uword follow_buffer_next);
491 static_always_inline vlib_buffer_pool_t *
492 vlib_get_buffer_pool (vlib_main_t * vm, u8 buffer_pool_index)
494 vlib_buffer_main_t *bm = vm->buffer_main;
495 return vec_elt_at_index (bm->buffer_pools, buffer_pool_index);
498 static_always_inline __clib_warn_unused_result uword
499 vlib_buffer_pool_get (vlib_main_t * vm, u8 buffer_pool_index, u32 * buffers,
502 vlib_buffer_pool_t *bp = vlib_get_buffer_pool (vm, buffer_pool_index);
505 ASSERT (bp->buffers);
507 clib_spinlock_lock (&bp->lock);
509 if (PREDICT_TRUE (n_buffers < len))
512 vlib_buffer_copy_indices (buffers, bp->buffers + len, n_buffers);
514 clib_spinlock_unlock (&bp->lock);
519 vlib_buffer_copy_indices (buffers, bp->buffers, len);
521 clib_spinlock_unlock (&bp->lock);
527 /** \brief Allocate buffers from specific pool into supplied array
529 @param vm - (vlib_main_t *) vlib main data structure pointer
530 @param buffers - (u32 * ) buffer index array
531 @param n_buffers - (u32) number of buffers requested
532 @return - (u32) number of buffers actually allocated, may be
533 less than the number requested or zero
536 always_inline __clib_warn_unused_result u32
537 vlib_buffer_alloc_from_pool (vlib_main_t * vm, u32 * buffers, u32 n_buffers,
538 u8 buffer_pool_index)
540 vlib_buffer_main_t *bm = vm->buffer_main;
541 vlib_buffer_pool_t *bp;
542 vlib_buffer_pool_thread_t *bpt;
543 u32 *src, *dst, len, n_left;
545 /* If buffer allocation fault injection is configured */
546 if (VLIB_BUFFER_ALLOC_FAULT_INJECTOR > 0)
548 u32 vlib_buffer_alloc_may_fail (vlib_main_t *, u32);
550 /* See how many buffers we're willing to allocate */
551 n_buffers = vlib_buffer_alloc_may_fail (vm, n_buffers);
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;
572 /* alloc bigger than cache - take buffers directly from main pool */
573 if (n_buffers >= VLIB_BUFFER_POOL_PER_THREAD_CACHE_SZ)
575 n_buffers = vlib_buffer_pool_get (vm, buffer_pool_index, buffers,
580 /* take everything available in the cache */
583 vlib_buffer_copy_indices (dst, bpt->cached_buffers, len);
589 len = round_pow2 (n_left, 32);
590 len = vlib_buffer_pool_get (vm, buffer_pool_index, bpt->cached_buffers,
596 u32 n_copy = clib_min (len, n_left);
597 src = bpt->cached_buffers + len - n_copy;
598 vlib_buffer_copy_indices (dst, src, n_copy);
599 bpt->n_cached -= n_copy;
606 /* Verify that buffers are known free. */
608 vlib_buffer_validate_alloc_free (vm, buffers, n_buffers,
609 VLIB_BUFFER_KNOWN_FREE);
610 if (PREDICT_FALSE (bm->alloc_callback_fn != 0))
611 bm->alloc_callback_fn (vm, buffer_pool_index, buffers, n_buffers);
615 /** \brief Allocate buffers from specific numa node into supplied array
617 @param vm - (vlib_main_t *) vlib main data structure pointer
618 @param buffers - (u32 * ) buffer index array
619 @param n_buffers - (u32) number of buffers requested
620 @param numa_node - (u32) numa node
621 @return - (u32) number of buffers actually allocated, may be
622 less than the number requested or zero
624 always_inline __clib_warn_unused_result u32
625 vlib_buffer_alloc_on_numa (vlib_main_t * vm, u32 * buffers, u32 n_buffers,
628 u8 index = vlib_buffer_pool_get_default_for_numa (vm, numa_node);
629 return vlib_buffer_alloc_from_pool (vm, buffers, n_buffers, index);
632 /** \brief Allocate buffers into supplied array
634 @param vm - (vlib_main_t *) vlib main data structure pointer
635 @param buffers - (u32 * ) buffer index array
636 @param n_buffers - (u32) number of buffers requested
637 @return - (u32) number of buffers actually allocated, may be
638 less than the number requested or zero
641 always_inline __clib_warn_unused_result u32
642 vlib_buffer_alloc (vlib_main_t * vm, u32 * buffers, u32 n_buffers)
644 return vlib_buffer_alloc_on_numa (vm, buffers, n_buffers, vm->numa_node);
647 /** \brief Allocate buffers into ring
649 @param vm - (vlib_main_t *) vlib main data structure pointer
650 @param buffers - (u32 * ) buffer index ring
651 @param start - (u32) first slot in the ring
652 @param ring_size - (u32) ring size
653 @param n_buffers - (u32) number of buffers requested
654 @return - (u32) number of buffers actually allocated, may be
655 less than the number requested or zero
657 always_inline __clib_warn_unused_result u32
658 vlib_buffer_alloc_to_ring (vlib_main_t * vm, u32 * ring, u32 start,
659 u32 ring_size, u32 n_buffers)
663 ASSERT (n_buffers <= ring_size);
665 if (PREDICT_TRUE (start + n_buffers <= ring_size))
666 return vlib_buffer_alloc (vm, ring + start, n_buffers);
668 n_alloc = vlib_buffer_alloc (vm, ring + start, ring_size - start);
670 if (PREDICT_TRUE (n_alloc == ring_size - start))
671 n_alloc += vlib_buffer_alloc (vm, ring, n_buffers - n_alloc);
676 /** \brief Allocate buffers into ring from specific buffer pool
678 @param vm - (vlib_main_t *) vlib main data structure pointer
679 @param buffers - (u32 * ) buffer index ring
680 @param start - (u32) first slot in the ring
681 @param ring_size - (u32) ring size
682 @param n_buffers - (u32) number of buffers requested
683 @return - (u32) number of buffers actually allocated, may be
684 less than the number requested or zero
686 always_inline __clib_warn_unused_result u32
687 vlib_buffer_alloc_to_ring_from_pool (vlib_main_t * vm, u32 * ring, u32 start,
688 u32 ring_size, u32 n_buffers,
689 u8 buffer_pool_index)
693 ASSERT (n_buffers <= ring_size);
695 if (PREDICT_TRUE (start + n_buffers <= ring_size))
696 return vlib_buffer_alloc_from_pool (vm, ring + start, n_buffers,
699 n_alloc = vlib_buffer_alloc_from_pool (vm, ring + start, ring_size - start,
702 if (PREDICT_TRUE (n_alloc == ring_size - start))
703 n_alloc += vlib_buffer_alloc_from_pool (vm, ring, n_buffers - n_alloc,
709 static_always_inline void
710 vlib_buffer_pool_put (vlib_main_t * vm, u8 buffer_pool_index,
711 u32 * buffers, u32 n_buffers)
713 vlib_buffer_main_t *bm = vm->buffer_main;
714 vlib_buffer_pool_t *bp = vlib_get_buffer_pool (vm, buffer_pool_index);
715 vlib_buffer_pool_thread_t *bpt = vec_elt_at_index (bp->threads,
717 u32 n_cached, n_empty;
720 vlib_buffer_validate_alloc_free (vm, buffers, n_buffers,
721 VLIB_BUFFER_KNOWN_ALLOCATED);
722 if (PREDICT_FALSE (bm->free_callback_fn != 0))
723 bm->free_callback_fn (vm, buffer_pool_index, buffers, n_buffers);
725 n_cached = bpt->n_cached;
726 n_empty = VLIB_BUFFER_POOL_PER_THREAD_CACHE_SZ - n_cached;
727 if (n_buffers <= n_empty)
729 vlib_buffer_copy_indices (bpt->cached_buffers + n_cached,
731 bpt->n_cached = n_cached + n_buffers;
735 vlib_buffer_copy_indices (bpt->cached_buffers + n_cached,
736 buffers + n_buffers - n_empty, n_empty);
737 bpt->n_cached = VLIB_BUFFER_POOL_PER_THREAD_CACHE_SZ;
739 clib_spinlock_lock (&bp->lock);
740 vlib_buffer_copy_indices (bp->buffers + bp->n_avail, buffers,
741 n_buffers - n_empty);
742 bp->n_avail += n_buffers - n_empty;
743 clib_spinlock_unlock (&bp->lock);
746 static_always_inline void
747 vlib_buffer_free_inline (vlib_main_t * vm, u32 * buffers, u32 n_buffers,
750 const int queue_size = 128;
751 vlib_buffer_pool_t *bp = 0;
752 u8 buffer_pool_index = ~0;
753 u32 n_queue = 0, queue[queue_size + 4];
754 vlib_buffer_t bt = { };
755 #if defined(CLIB_HAVE_VEC128)
756 vlib_buffer_t bpi_mask = {.buffer_pool_index = ~0 };
757 vlib_buffer_t bpi_vec = {};
758 vlib_buffer_t flags_refs_mask = {
759 .flags = VLIB_BUFFER_NEXT_PRESENT,
764 if (PREDICT_FALSE (n_buffers == 0))
767 vlib_buffer_t *b = vlib_get_buffer (vm, buffers[0]);
768 buffer_pool_index = b->buffer_pool_index;
769 bp = vlib_get_buffer_pool (vm, buffer_pool_index);
770 vlib_buffer_copy_template (&bt, &bp->buffer_template);
771 #if defined(CLIB_HAVE_VEC128)
772 bpi_vec.buffer_pool_index = buffer_pool_index;
778 u32 bi, sum = 0, flags, next;
783 vlib_get_buffers (vm, buffers, b, 4);
787 vlib_get_buffers (vm, buffers + 8, b + 4, 4);
788 vlib_prefetch_buffer_header (b[4], LOAD);
789 vlib_prefetch_buffer_header (b[5], LOAD);
790 vlib_prefetch_buffer_header (b[6], LOAD);
791 vlib_prefetch_buffer_header (b[7], LOAD);
794 #if defined(CLIB_HAVE_VEC128)
795 u8x16 p0, p1, p2, p3, r;
796 p0 = u8x16_load_unaligned (b[0]);
797 p1 = u8x16_load_unaligned (b[1]);
798 p2 = u8x16_load_unaligned (b[2]);
799 p3 = u8x16_load_unaligned (b[3]);
801 r = p0 ^ bpi_vec.as_u8x16[0];
802 r |= p1 ^ bpi_vec.as_u8x16[0];
803 r |= p2 ^ bpi_vec.as_u8x16[0];
804 r |= p3 ^ bpi_vec.as_u8x16[0];
805 r &= bpi_mask.as_u8x16[0];
806 r |= (p0 | p1 | p2 | p3) & flags_refs_mask.as_u8x16[0];
808 sum = !u8x16_is_all_zero (r);
814 sum &= VLIB_BUFFER_NEXT_PRESENT;
815 sum += b[0]->ref_count - 1;
816 sum += b[1]->ref_count - 1;
817 sum += b[2]->ref_count - 1;
818 sum += b[3]->ref_count - 1;
819 sum |= b[0]->buffer_pool_index ^ buffer_pool_index;
820 sum |= b[1]->buffer_pool_index ^ buffer_pool_index;
821 sum |= b[2]->buffer_pool_index ^ buffer_pool_index;
822 sum |= b[3]->buffer_pool_index ^ buffer_pool_index;
828 vlib_buffer_copy_indices (queue + n_queue, buffers, 4);
829 vlib_buffer_copy_template (b[0], &bt);
830 vlib_buffer_copy_template (b[1], &bt);
831 vlib_buffer_copy_template (b[2], &bt);
832 vlib_buffer_copy_template (b[3], &bt);
835 vlib_buffer_validate (vm, b[0]);
836 vlib_buffer_validate (vm, b[1]);
837 vlib_buffer_validate (vm, b[2]);
838 vlib_buffer_validate (vm, b[3]);
840 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[0]);
841 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[1]);
842 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[2]);
843 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[3]);
845 if (n_queue >= queue_size)
847 vlib_buffer_pool_put (vm, buffer_pool_index, queue, n_queue);
858 b[0] = vlib_get_buffer (vm, bi);
860 next = b[0]->next_buffer;
862 if (PREDICT_FALSE (buffer_pool_index != b[0]->buffer_pool_index))
867 vlib_buffer_pool_put (vm, buffer_pool_index, queue, n_queue);
871 buffer_pool_index = b[0]->buffer_pool_index;
872 #if defined(CLIB_HAVE_VEC128)
873 bpi_vec.buffer_pool_index = buffer_pool_index;
875 bp = vlib_get_buffer_pool (vm, buffer_pool_index);
876 vlib_buffer_copy_template (&bt, &bp->buffer_template);
879 vlib_buffer_validate (vm, b[0]);
881 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[0]);
883 if (clib_atomic_sub_fetch (&b[0]->ref_count, 1) == 0)
885 vlib_buffer_copy_template (b[0], &bt);
886 queue[n_queue++] = bi;
889 if (n_queue == queue_size)
891 vlib_buffer_pool_put (vm, buffer_pool_index, queue, queue_size);
895 if (maybe_next && (flags & VLIB_BUFFER_NEXT_PRESENT))
906 vlib_buffer_pool_put (vm, buffer_pool_index, queue, n_queue);
910 /** \brief Free buffers
911 Frees the entire buffer chain for each buffer
913 @param vm - (vlib_main_t *) vlib main data structure pointer
914 @param buffers - (u32 * ) buffer index array
915 @param n_buffers - (u32) number of buffers to free
919 vlib_buffer_free (vlib_main_t * vm,
920 /* pointer to first buffer */
922 /* number of buffers to free */
925 vlib_buffer_free_inline (vm, buffers, n_buffers, /* maybe next */ 1);
928 /** \brief Free buffers, does not free the buffer chain for each buffer
930 @param vm - (vlib_main_t *) vlib main data structure pointer
931 @param buffers - (u32 * ) buffer index array
932 @param n_buffers - (u32) number of buffers to free
936 vlib_buffer_free_no_next (vlib_main_t * vm,
937 /* pointer to first buffer */
939 /* number of buffers to free */
942 vlib_buffer_free_inline (vm, buffers, n_buffers, /* maybe next */ 0);
945 /** \brief Free one buffer
946 Shorthand to free a single buffer chain.
948 @param vm - (vlib_main_t *) vlib main data structure pointer
949 @param buffer_index - (u32) buffer index to free
952 vlib_buffer_free_one (vlib_main_t * vm, u32 buffer_index)
954 vlib_buffer_free_inline (vm, &buffer_index, 1, /* maybe next */ 1);
957 /** \brief Free buffers from ring
959 @param vm - (vlib_main_t *) vlib main data structure pointer
960 @param buffers - (u32 * ) buffer index ring
961 @param start - (u32) first slot in the ring
962 @param ring_size - (u32) ring size
963 @param n_buffers - (u32) number of buffers
966 vlib_buffer_free_from_ring (vlib_main_t * vm, u32 * ring, u32 start,
967 u32 ring_size, u32 n_buffers)
969 ASSERT (n_buffers <= ring_size);
971 if (PREDICT_TRUE (start + n_buffers <= ring_size))
973 vlib_buffer_free (vm, ring + start, n_buffers);
977 vlib_buffer_free (vm, ring + start, ring_size - start);
978 vlib_buffer_free (vm, ring, n_buffers - (ring_size - start));
982 /** \brief Free buffers from ring without freeing tail buffers
984 @param vm - (vlib_main_t *) vlib main data structure pointer
985 @param buffers - (u32 * ) buffer index ring
986 @param start - (u32) first slot in the ring
987 @param ring_size - (u32) ring size
988 @param n_buffers - (u32) number of buffers
991 vlib_buffer_free_from_ring_no_next (vlib_main_t * vm, u32 * ring, u32 start,
992 u32 ring_size, u32 n_buffers)
994 ASSERT (n_buffers <= ring_size);
996 if (PREDICT_TRUE (start + n_buffers <= ring_size))
998 vlib_buffer_free_no_next (vm, ring + start, n_buffers);
1002 vlib_buffer_free_no_next (vm, ring + start, ring_size - start);
1003 vlib_buffer_free_no_next (vm, ring, n_buffers - (ring_size - start));
1007 /* Append given data to end of buffer, possibly allocating new buffers. */
1008 int vlib_buffer_add_data (vlib_main_t * vm, u32 * buffer_index, void *data,
1011 /* Define vlib_buffer and vnet_buffer flags bits preserved for copy/clone */
1012 #define VLIB_BUFFER_COPY_CLONE_FLAGS_MASK \
1013 (VLIB_BUFFER_NEXT_PRESENT | VLIB_BUFFER_TOTAL_LENGTH_VALID | \
1014 VLIB_BUFFER_IS_TRACED | ~VLIB_BUFFER_FLAGS_ALL)
1016 /* duplicate all buffers in chain */
1017 always_inline vlib_buffer_t *
1018 vlib_buffer_copy (vlib_main_t * vm, vlib_buffer_t * b)
1020 vlib_buffer_t *s, *d, *fd;
1021 uword n_alloc, n_buffers = 1;
1022 u32 flag_mask = VLIB_BUFFER_COPY_CLONE_FLAGS_MASK;
1026 while (s->flags & VLIB_BUFFER_NEXT_PRESENT)
1029 s = vlib_get_buffer (vm, s->next_buffer);
1031 u32 new_buffers[n_buffers];
1033 n_alloc = vlib_buffer_alloc (vm, new_buffers, n_buffers);
1035 /* No guarantee that we'll get all the buffers we asked for */
1036 if (PREDICT_FALSE (n_alloc < n_buffers))
1039 vlib_buffer_free (vm, new_buffers, n_alloc);
1045 fd = d = vlib_get_buffer (vm, new_buffers[0]);
1046 d->current_data = s->current_data;
1047 d->current_length = s->current_length;
1048 d->flags = s->flags & flag_mask;
1049 d->trace_handle = s->trace_handle;
1050 d->total_length_not_including_first_buffer =
1051 s->total_length_not_including_first_buffer;
1052 clib_memcpy_fast (d->opaque, s->opaque, sizeof (s->opaque));
1053 clib_memcpy_fast (d->opaque2, s->opaque2, sizeof (s->opaque2));
1054 clib_memcpy_fast (vlib_buffer_get_current (d),
1055 vlib_buffer_get_current (s), s->current_length);
1058 for (i = 1; i < n_buffers; i++)
1061 d->next_buffer = new_buffers[i];
1063 s = vlib_get_buffer (vm, s->next_buffer);
1064 d = vlib_get_buffer (vm, new_buffers[i]);
1065 d->current_data = s->current_data;
1066 d->current_length = s->current_length;
1067 clib_memcpy_fast (vlib_buffer_get_current (d),
1068 vlib_buffer_get_current (s), s->current_length);
1069 d->flags = s->flags & flag_mask;
1075 /* duplicate first buffer in chain */
1076 always_inline vlib_buffer_t *
1077 vlib_buffer_copy_no_chain (vlib_main_t * vm, vlib_buffer_t * b, u32 * di)
1081 if ((vlib_buffer_alloc (vm, di, 1)) != 1)
1084 d = vlib_get_buffer (vm, *di);
1086 d->current_data = b->current_data;
1087 d->current_length = b->current_length;
1088 clib_memcpy_fast (d->opaque, b->opaque, sizeof (b->opaque));
1089 clib_memcpy_fast (d->opaque2, b->opaque2, sizeof (b->opaque2));
1090 clib_memcpy_fast (vlib_buffer_get_current (d),
1091 vlib_buffer_get_current (b), b->current_length);
1096 /* \brief Move packet from current position to offset position in buffer.
1097 Only work for small packet using one buffer with room to fit the move
1098 @param vm - (vlib_main_t *) vlib main data structure pointer
1099 @param b - (vlib_buffer_t *) pointer to buffer
1100 @param offset - (i16) position to move the packet in buffer
1103 vlib_buffer_move (vlib_main_t * vm, vlib_buffer_t * b, i16 offset)
1105 ASSERT ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0);
1106 ASSERT (offset + VLIB_BUFFER_PRE_DATA_SIZE >= 0);
1107 ASSERT (offset + b->current_length <
1108 vlib_buffer_get_default_data_size (vm));
1110 u8 *source = vlib_buffer_get_current (b);
1111 b->current_data = offset;
1112 u8 *destination = vlib_buffer_get_current (b);
1113 u16 length = b->current_length;
1115 if (source + length <= destination) /* no overlap */
1116 clib_memcpy_fast (destination, source, length);
1118 memmove (destination, source, length);
1121 /** \brief Create a maximum of 256 clones of buffer and store them
1122 in the supplied array
1124 @param vm - (vlib_main_t *) vlib main data structure pointer
1125 @param src_buffer - (u32) source buffer index
1126 @param buffers - (u32 * ) buffer index array
1127 @param n_buffers - (u16) number of buffer clones requested (<=256)
1128 @param head_end_offset - (u16) offset relative to current position
1129 where packet head ends
1130 @param offset - (i16) copy packet head at current position if 0,
1131 else at offset position to change headroom space as specified
1132 @return - (u16) number of buffers actually cloned, may be
1133 less than the number requested or zero
1136 vlib_buffer_clone_256 (vlib_main_t * vm, u32 src_buffer, u32 * buffers,
1137 u16 n_buffers, u16 head_end_offset, i16 offset)
1140 vlib_buffer_t *s = vlib_get_buffer (vm, src_buffer);
1142 ASSERT (s->ref_count == 1);
1144 ASSERT (n_buffers <= 256);
1145 ASSERT (offset + VLIB_BUFFER_PRE_DATA_SIZE >= 0);
1146 ASSERT ((offset + head_end_offset) <
1147 vlib_buffer_get_default_data_size (vm));
1149 if (s->current_length <= head_end_offset + CLIB_CACHE_LINE_BYTES * 2)
1151 buffers[0] = src_buffer;
1153 vlib_buffer_move (vm, s, offset);
1155 for (i = 1; i < n_buffers; i++)
1158 d = vlib_buffer_copy (vm, s);
1161 buffers[i] = vlib_get_buffer_index (vm, d);
1167 if (PREDICT_FALSE ((n_buffers == 1) && (offset == 0)))
1169 buffers[0] = src_buffer;
1173 n_buffers = vlib_buffer_alloc_from_pool (vm, buffers, n_buffers,
1174 s->buffer_pool_index);
1176 for (i = 0; i < n_buffers; i++)
1178 vlib_buffer_t *d = vlib_get_buffer (vm, buffers[i]);
1180 d->current_data = offset;
1182 d->current_data = s->current_data;
1184 d->current_length = head_end_offset;
1185 ASSERT (d->buffer_pool_index == s->buffer_pool_index);
1187 d->total_length_not_including_first_buffer = s->current_length -
1189 if (PREDICT_FALSE (s->flags & VLIB_BUFFER_NEXT_PRESENT))
1191 d->total_length_not_including_first_buffer +=
1192 s->total_length_not_including_first_buffer;
1194 d->flags = (s->flags & VLIB_BUFFER_COPY_CLONE_FLAGS_MASK) |
1195 VLIB_BUFFER_NEXT_PRESENT;
1196 d->trace_handle = s->trace_handle;
1197 clib_memcpy_fast (d->opaque, s->opaque, sizeof (s->opaque));
1198 clib_memcpy_fast (d->opaque2, s->opaque2, sizeof (s->opaque2));
1199 clib_memcpy_fast (vlib_buffer_get_current (d),
1200 vlib_buffer_get_current (s), head_end_offset);
1201 d->next_buffer = src_buffer;
1203 vlib_buffer_advance (s, head_end_offset);
1204 s->ref_count = n_buffers ? n_buffers : s->ref_count;
1205 while (s->flags & VLIB_BUFFER_NEXT_PRESENT)
1207 s = vlib_get_buffer (vm, s->next_buffer);
1208 s->ref_count = n_buffers ? n_buffers : s->ref_count;
1214 /** \brief Create multiple clones of buffer and store them
1215 in the supplied array
1217 @param vm - (vlib_main_t *) vlib main data structure pointer
1218 @param src_buffer - (u32) source buffer index
1219 @param buffers - (u32 * ) buffer index array
1220 @param n_buffers - (u16) number of buffer clones requested (<=256)
1221 @param head_end_offset - (u16) offset relative to current position
1222 where packet head ends
1223 @param offset - (i16) copy packet head at current position if 0,
1224 else at offset position to change headroom space as specified
1225 @return - (u16) number of buffers actually cloned, may be
1226 less than the number requested or zero
1229 vlib_buffer_clone_at_offset (vlib_main_t * vm, u32 src_buffer, u32 * buffers,
1230 u16 n_buffers, u16 head_end_offset, i16 offset)
1232 vlib_buffer_t *s = vlib_get_buffer (vm, src_buffer);
1235 while (n_buffers > 256)
1237 vlib_buffer_t *copy;
1238 copy = vlib_buffer_copy (vm, s);
1239 n_cloned += vlib_buffer_clone_256 (vm,
1240 vlib_get_buffer_index (vm, copy),
1241 (buffers + n_cloned),
1242 256, head_end_offset, offset);
1245 n_cloned += vlib_buffer_clone_256 (vm, src_buffer,
1247 n_buffers, head_end_offset, offset);
1252 /** \brief Create multiple clones of buffer and store them
1253 in the supplied array
1255 @param vm - (vlib_main_t *) vlib main data structure pointer
1256 @param src_buffer - (u32) source buffer index
1257 @param buffers - (u32 * ) buffer index array
1258 @param n_buffers - (u16) number of buffer clones requested (<=256)
1259 @param head_end_offset - (u16) offset relative to current position
1260 where packet head ends
1261 @return - (u16) number of buffers actually cloned, may be
1262 less than the number requested or zero
1265 vlib_buffer_clone (vlib_main_t * vm, u32 src_buffer, u32 * buffers,
1266 u16 n_buffers, u16 head_end_offset)
1268 return vlib_buffer_clone_at_offset (vm, src_buffer, buffers, n_buffers,
1269 head_end_offset, 0);
1272 /** \brief Attach cloned tail to the buffer
1274 @param vm - (vlib_main_t *) vlib main data structure pointer
1275 @param head - (vlib_buffer_t *) head buffer
1276 @param tail - (Vlib buffer_t *) tail buffer to clone and attach to head
1280 vlib_buffer_attach_clone (vlib_main_t * vm, vlib_buffer_t * head,
1281 vlib_buffer_t * tail)
1283 ASSERT ((head->flags & VLIB_BUFFER_NEXT_PRESENT) == 0);
1284 ASSERT (head->buffer_pool_index == tail->buffer_pool_index);
1286 head->flags |= VLIB_BUFFER_NEXT_PRESENT;
1287 head->flags &= ~VLIB_BUFFER_TOTAL_LENGTH_VALID;
1288 head->flags &= ~VLIB_BUFFER_EXT_HDR_VALID;
1289 head->flags |= (tail->flags & VLIB_BUFFER_TOTAL_LENGTH_VALID);
1290 head->next_buffer = vlib_get_buffer_index (vm, tail);
1291 head->total_length_not_including_first_buffer = tail->current_length +
1292 tail->total_length_not_including_first_buffer;
1295 clib_atomic_add_fetch (&tail->ref_count, 1);
1297 if (tail->flags & VLIB_BUFFER_NEXT_PRESENT)
1299 tail = vlib_get_buffer (vm, tail->next_buffer);
1304 /* Initializes the buffer as an empty packet with no chained buffers. */
1306 vlib_buffer_chain_init (vlib_buffer_t * first)
1308 first->total_length_not_including_first_buffer = 0;
1309 first->current_length = 0;
1310 first->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
1311 first->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
1314 /* The provided next_bi buffer index is appended to the end of the packet. */
1315 always_inline vlib_buffer_t *
1316 vlib_buffer_chain_buffer (vlib_main_t * vm, vlib_buffer_t * last, u32 next_bi)
1318 vlib_buffer_t *next_buffer = vlib_get_buffer (vm, next_bi);
1319 last->next_buffer = next_bi;
1320 last->flags |= VLIB_BUFFER_NEXT_PRESENT;
1321 next_buffer->current_length = 0;
1322 next_buffer->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
1326 /* Increases or decreases the packet length.
1327 * It does not allocate or deallocate new buffers.
1328 * Therefore, the added length must be compatible
1329 * with the last buffer. */
1331 vlib_buffer_chain_increase_length (vlib_buffer_t * first,
1332 vlib_buffer_t * last, i32 len)
1334 last->current_length += len;
1336 first->total_length_not_including_first_buffer += len;
1339 /* Copy data to the end of the packet and increases its length.
1340 * It does not allocate new buffers.
1341 * Returns the number of copied bytes. */
1343 vlib_buffer_chain_append_data (vlib_main_t * vm,
1344 vlib_buffer_t * first,
1345 vlib_buffer_t * last, void *data, u16 data_len)
1347 u32 n_buffer_bytes = vlib_buffer_get_default_data_size (vm);
1348 ASSERT (n_buffer_bytes >= last->current_length + last->current_data);
1349 u16 len = clib_min (data_len,
1350 n_buffer_bytes - last->current_length -
1351 last->current_data);
1352 clib_memcpy_fast (vlib_buffer_get_current (last) + last->current_length,
1354 vlib_buffer_chain_increase_length (first, last, len);
1358 /* Copy data to the end of the packet and increases its length.
1359 * Allocates additional buffers from the free list if necessary.
1360 * Returns the number of copied bytes.
1361 * 'last' value is modified whenever new buffers are allocated and
1362 * chained and points to the last buffer in the chain. */
1364 vlib_buffer_chain_append_data_with_alloc (vlib_main_t * vm,
1365 vlib_buffer_t * first,
1366 vlib_buffer_t ** last, void *data,
1368 void vlib_buffer_chain_validate (vlib_main_t * vm, vlib_buffer_t * first);
1370 format_function_t format_vlib_buffer, format_vlib_buffer_and_data,
1371 format_vlib_buffer_contents, format_vlib_buffer_no_chain;
1375 /* Vector of packet data. */
1378 /* Number of buffers to allocate in each call to allocator. */
1379 u32 min_n_buffers_each_alloc;
1382 } vlib_packet_template_t;
1384 void vlib_packet_template_init (vlib_main_t * vm,
1385 vlib_packet_template_t * t,
1387 uword n_packet_data_bytes,
1388 uword min_n_buffers_each_alloc,
1391 void *vlib_packet_template_get_packet (vlib_main_t * vm,
1392 vlib_packet_template_t * t,
1396 vlib_packet_template_free (vlib_main_t * vm, vlib_packet_template_t * t)
1398 vec_free (t->packet_data);
1402 vlib_buffer_space_left_at_end (vlib_main_t * vm, vlib_buffer_t * b)
1404 return b->data + vlib_buffer_get_default_data_size (vm) -
1405 ((u8 *) vlib_buffer_get_current (b) + b->current_length);
1408 #define VLIB_BUFFER_LINEARIZE_MAX 64
1411 vlib_buffer_chain_linearize (vlib_main_t * vm, vlib_buffer_t * b)
1413 vlib_buffer_t *dst_b;
1414 u32 n_buffers = 1, to_free = 0;
1415 u16 rem_len, dst_len, data_size, src_len = 0;
1418 if (PREDICT_TRUE ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0))
1421 ASSERT (1 == b->ref_count);
1422 if (PREDICT_FALSE (1 != b->ref_count))
1425 data_size = vlib_buffer_get_default_data_size (vm);
1426 rem_len = vlib_buffer_length_in_chain (vm, b) - b->current_length;
1429 dst = vlib_buffer_get_tail (dst_b);
1430 dst_len = vlib_buffer_space_left_at_end (vm, dst_b);
1432 b->total_length_not_including_first_buffer -= dst_len;
1438 while (0 == src_len)
1440 ASSERT (b->flags & VLIB_BUFFER_NEXT_PRESENT);
1441 if (PREDICT_FALSE (!(b->flags & VLIB_BUFFER_NEXT_PRESENT)))
1442 break; /* malformed chained buffer */
1444 b = vlib_get_buffer (vm, b->next_buffer);
1445 src = vlib_buffer_get_current (b);
1446 src_len = b->current_length;
1451 ASSERT (dst_b->flags & VLIB_BUFFER_NEXT_PRESENT);
1452 if (PREDICT_FALSE (!(dst_b->flags & VLIB_BUFFER_NEXT_PRESENT)))
1453 break; /* malformed chained buffer */
1455 vlib_buffer_t *next_dst_b = vlib_get_buffer (vm, dst_b->next_buffer);
1457 if (PREDICT_TRUE (1 == next_dst_b->ref_count))
1459 /* normal case: buffer is not cloned, just use it */
1464 /* cloned buffer, build a new dest chain from there */
1465 vlib_buffer_t *bufs[VLIB_BUFFER_LINEARIZE_MAX];
1466 u32 bis[VLIB_BUFFER_LINEARIZE_MAX + 1];
1467 const int n = (rem_len + data_size - 1) / data_size;
1471 ASSERT (n <= VLIB_BUFFER_LINEARIZE_MAX);
1472 if (PREDICT_FALSE (n > VLIB_BUFFER_LINEARIZE_MAX))
1475 n_alloc = vlib_buffer_alloc (vm, bis, n);
1476 if (PREDICT_FALSE (n_alloc != n))
1478 vlib_buffer_free (vm, bis, n_alloc);
1482 vlib_get_buffers (vm, bis, bufs, n);
1484 for (i = 0; i < n - 1; i++)
1486 bufs[i]->flags |= VLIB_BUFFER_NEXT_PRESENT;
1487 bufs[i]->next_buffer = bis[i + 1];
1490 to_free = dst_b->next_buffer;
1491 dst_b->next_buffer = bis[0];
1497 dst_b->current_data = clib_min (0, dst_b->current_data);
1498 dst_b->current_length = 0;
1500 dst = dst_b->data + dst_b->current_data;
1501 dst_len = data_size - dst_b->current_data;
1504 copy_len = clib_min (src_len, dst_len);
1506 if (PREDICT_TRUE (src == dst))
1510 else if (src + copy_len > dst && dst + copy_len > src)
1512 /* src and dst overlap */
1513 ASSERT (b == dst_b);
1514 memmove (dst, src, copy_len);
1518 clib_memcpy_fast (dst, src, copy_len);
1521 dst_b->current_length += copy_len;
1525 dst_len -= copy_len;
1526 src_len -= copy_len;
1527 rem_len -= copy_len;
1530 /* in case of a malformed chain buffer, we'll exit early from the loop. */
1531 ASSERT (0 == rem_len);
1532 b->total_length_not_including_first_buffer -= rem_len;
1535 vlib_buffer_free_one (vm, to_free);
1537 if (dst_b->flags & VLIB_BUFFER_NEXT_PRESENT)
1539 /* the resulting chain is smaller than the original, cut it there */
1540 dst_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
1541 vlib_buffer_free_one (vm, dst_b->next_buffer);
1544 /* no longer a chained buffer */
1545 dst_b->flags &= ~VLIB_BUFFER_TOTAL_LENGTH_VALID;
1546 dst_b->total_length_not_including_first_buffer = 0;
1553 #endif /* included_vlib_buffer_funcs_h */
1556 * fd.io coding-style-patch-verification: ON
1559 * eval: (c-set-style "gnu")