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_next_with_aux_fn_t) (
60 vlib_main_t *vm, vlib_node_runtime_t *node, u32 *buffers, u32 *aux_data,
61 u16 *nexts, uword count);
62 typedef void (vlib_buffer_enqueue_to_single_next_fn_t) (
63 vlib_main_t *vm, vlib_node_runtime_t *node, u32 *ers, u16 next_index,
66 typedef void (vlib_buffer_enqueue_to_single_next_with_aux_fn_t) (
67 vlib_main_t *vm, vlib_node_runtime_t *node, u32 *ers, u32 *aux_data,
68 u16 next_index, u32 count);
70 typedef u32 (vlib_buffer_enqueue_to_thread_fn_t) (
71 vlib_main_t *vm, vlib_node_runtime_t *node, u32 frame_queue_index,
72 u32 *buffer_indices, u16 *thread_indices, u32 n_packets,
73 int drop_on_congestion);
75 typedef u32 (vlib_buffer_enqueue_to_thread_with_aux_fn_t) (
76 vlib_main_t *vm, vlib_node_runtime_t *node, u32 frame_queue_index,
77 u32 *buffer_indices, u32 *aux, u16 *thread_indices, u32 n_packets,
78 int drop_on_congestion);
82 vlib_buffer_enqueue_to_next_fn_t *buffer_enqueue_to_next_fn;
83 vlib_buffer_enqueue_to_next_with_aux_fn_t
84 *buffer_enqueue_to_next_with_aux_fn;
85 vlib_buffer_enqueue_to_single_next_fn_t *buffer_enqueue_to_single_next_fn;
86 vlib_buffer_enqueue_to_single_next_with_aux_fn_t
87 *buffer_enqueue_to_single_next_with_aux_fn;
88 vlib_buffer_enqueue_to_thread_fn_t *buffer_enqueue_to_thread_fn;
89 vlib_buffer_enqueue_to_thread_with_aux_fn_t
90 *buffer_enqueue_to_thread_with_aux_fn;
91 } vlib_buffer_func_main_t;
93 extern vlib_buffer_func_main_t vlib_buffer_func_main;
96 vlib_buffer_validate (vlib_main_t * vm, vlib_buffer_t * b)
98 vlib_buffer_main_t *bm = vm->buffer_main;
99 vlib_buffer_pool_t *bp;
101 /* reference count in allocated buffer always must be 1 or higher */
102 ASSERT (b->ref_count > 0);
104 /* verify that buffer pool index is valid */
105 bp = vec_elt_at_index (bm->buffer_pools, b->buffer_pool_index);
106 ASSERT (pointer_to_uword (b) >= bp->start);
107 ASSERT (pointer_to_uword (b) < bp->start + bp->size -
108 (bp->data_size + sizeof (vlib_buffer_t)));
112 vlib_buffer_ptr_from_index (uword buffer_mem_start, u32 buffer_index,
115 offset += ((uword) buffer_index) << CLIB_LOG2_CACHE_LINE_BYTES;
116 return uword_to_pointer (buffer_mem_start + offset, vlib_buffer_t *);
119 /** \brief Translate buffer index into buffer pointer
121 @param vm - (vlib_main_t *) vlib main data structure pointer
122 @param buffer_index - (u32) buffer index
123 @return - (vlib_buffer_t *) buffer pointer
125 always_inline vlib_buffer_t *
126 vlib_get_buffer (vlib_main_t * vm, u32 buffer_index)
128 vlib_buffer_main_t *bm = vm->buffer_main;
131 b = vlib_buffer_ptr_from_index (bm->buffer_mem_start, buffer_index, 0);
132 vlib_buffer_validate (vm, b);
136 static_always_inline u32
137 vlib_buffer_get_default_data_size (vlib_main_t * vm)
139 return vm->buffer_main->default_data_size;
142 static_always_inline void
143 vlib_buffer_copy_indices (u32 * dst, u32 * src, u32 n_indices)
145 clib_memcpy_u32 (dst, src, n_indices);
149 vlib_buffer_copy_indices_from_ring (u32 * dst, u32 * ring, u32 start,
150 u32 ring_size, u32 n_buffers)
152 ASSERT (n_buffers <= ring_size);
154 if (PREDICT_TRUE (start + n_buffers <= ring_size))
156 vlib_buffer_copy_indices (dst, ring + start, n_buffers);
160 u32 n = ring_size - start;
161 vlib_buffer_copy_indices (dst, ring + start, n);
162 vlib_buffer_copy_indices (dst + n, ring, n_buffers - n);
167 vlib_buffer_copy_indices_to_ring (u32 * ring, u32 * src, u32 start,
168 u32 ring_size, u32 n_buffers)
170 ASSERT (n_buffers <= ring_size);
172 if (PREDICT_TRUE (start + n_buffers <= ring_size))
174 vlib_buffer_copy_indices (ring + start, src, n_buffers);
178 u32 n = ring_size - start;
179 vlib_buffer_copy_indices (ring + start, src, n);
180 vlib_buffer_copy_indices (ring, src + n, n_buffers - n);
184 STATIC_ASSERT_OFFSET_OF (vlib_buffer_t, template_end, 64);
185 static_always_inline void
186 vlib_buffer_copy_template (vlib_buffer_t * b, vlib_buffer_t * bt)
188 #if defined CLIB_HAVE_VEC512
189 b->as_u8x64[0] = bt->as_u8x64[0];
190 #elif defined (CLIB_HAVE_VEC256)
191 b->as_u8x32[0] = bt->as_u8x32[0];
192 b->as_u8x32[1] = bt->as_u8x32[1];
193 #elif defined (CLIB_HAVE_VEC128)
194 b->as_u8x16[0] = bt->as_u8x16[0];
195 b->as_u8x16[1] = bt->as_u8x16[1];
196 b->as_u8x16[2] = bt->as_u8x16[2];
197 b->as_u8x16[3] = bt->as_u8x16[3];
199 clib_memcpy_fast (b, bt, 64);
204 vlib_buffer_pool_get_default_for_numa (vlib_main_t * vm, u32 numa_node)
206 ASSERT (numa_node < VLIB_BUFFER_MAX_NUMA_NODES);
207 return vm->buffer_main->default_buffer_pool_index_for_numa[numa_node];
210 /** \brief Translate array of buffer indices into buffer pointers with offset
212 @param vm - (vlib_main_t *) vlib main data structure pointer
213 @param bi - (u32 *) array of buffer indices
214 @param b - (void **) array to store buffer pointers
215 @param count - (uword) number of elements
216 @param offset - (i32) offset applied to each pointer
218 static_always_inline void
219 vlib_get_buffers_with_offset (vlib_main_t *vm, u32 *bi, void **b, u32 count,
222 uword buffer_mem_start = vm->buffer_main->buffer_mem_start;
223 void *base = (void *) (buffer_mem_start + offset);
224 int objsize = __builtin_object_size (b, 0);
225 const int sh = CLIB_LOG2_CACHE_LINE_BYTES;
227 if (COMPILE_TIME_CONST (count) == 0 && objsize >= 64 * sizeof (b[0]) &&
228 (objsize & ((8 * sizeof (b[0])) - 1)) == 0)
230 u32 n = round_pow2 (count, 8);
231 ASSERT (objsize >= count);
232 CLIB_ASSUME (objsize >= count);
235 clib_index_to_ptr_u32 (bi, base, sh, b, 64);
243 clib_index_to_ptr_u32 (bi, base, sh, b, 8);
250 clib_index_to_ptr_u32 (bi, base, sh, b, count);
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, u32 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 __clib_warn_unused_result 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
547 always_inline __clib_warn_unused_result u32
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 /* If buffer allocation fault injection is configured */
557 if (VLIB_BUFFER_ALLOC_FAULT_INJECTOR > 0)
559 u32 vlib_buffer_alloc_may_fail (vlib_main_t *, u32);
561 /* See how many buffers we're willing to allocate */
562 n_buffers = vlib_buffer_alloc_may_fail (vm, n_buffers);
567 bp = vec_elt_at_index (bm->buffer_pools, buffer_pool_index);
568 bpt = vec_elt_at_index (bp->threads, vm->thread_index);
574 /* per-thread cache contains enough buffers */
575 if (len >= n_buffers)
577 src = bpt->cached_buffers + len - n_buffers;
578 vlib_buffer_copy_indices (dst, src, n_buffers);
579 bpt->n_cached -= n_buffers;
583 /* alloc bigger than cache - take buffers directly from main pool */
584 if (n_buffers >= VLIB_BUFFER_POOL_PER_THREAD_CACHE_SZ)
586 n_buffers = vlib_buffer_pool_get (vm, buffer_pool_index, buffers,
591 /* take everything available in the cache */
594 vlib_buffer_copy_indices (dst, bpt->cached_buffers, len);
600 len = round_pow2 (n_left, 32);
601 len = vlib_buffer_pool_get (vm, buffer_pool_index, bpt->cached_buffers,
607 u32 n_copy = clib_min (len, n_left);
608 src = bpt->cached_buffers + len - n_copy;
609 vlib_buffer_copy_indices (dst, src, n_copy);
610 bpt->n_cached -= n_copy;
617 /* Verify that buffers are known free. */
619 vlib_buffer_validate_alloc_free (vm, buffers, n_buffers,
620 VLIB_BUFFER_KNOWN_FREE);
621 if (PREDICT_FALSE (bm->alloc_callback_fn != 0))
622 bm->alloc_callback_fn (vm, buffer_pool_index, buffers, n_buffers);
626 /** \brief Allocate buffers from specific numa node into supplied array
628 @param vm - (vlib_main_t *) vlib main data structure pointer
629 @param buffers - (u32 * ) buffer index array
630 @param n_buffers - (u32) number of buffers requested
631 @param numa_node - (u32) numa node
632 @return - (u32) number of buffers actually allocated, may be
633 less than the number requested or zero
635 always_inline __clib_warn_unused_result u32
636 vlib_buffer_alloc_on_numa (vlib_main_t * vm, u32 * buffers, u32 n_buffers,
639 u8 index = vlib_buffer_pool_get_default_for_numa (vm, numa_node);
640 return vlib_buffer_alloc_from_pool (vm, buffers, n_buffers, index);
643 /** \brief Allocate buffers into supplied array
645 @param vm - (vlib_main_t *) vlib main data structure pointer
646 @param buffers - (u32 * ) buffer index array
647 @param n_buffers - (u32) number of buffers requested
648 @return - (u32) number of buffers actually allocated, may be
649 less than the number requested or zero
652 always_inline __clib_warn_unused_result u32
653 vlib_buffer_alloc (vlib_main_t * vm, u32 * buffers, u32 n_buffers)
655 return vlib_buffer_alloc_on_numa (vm, buffers, n_buffers, vm->numa_node);
658 /** \brief Allocate buffers into ring
660 @param vm - (vlib_main_t *) vlib main data structure pointer
661 @param buffers - (u32 * ) buffer index ring
662 @param start - (u32) first slot in the ring
663 @param ring_size - (u32) ring size
664 @param n_buffers - (u32) number of buffers requested
665 @return - (u32) number of buffers actually allocated, may be
666 less than the number requested or zero
668 always_inline __clib_warn_unused_result u32
669 vlib_buffer_alloc_to_ring (vlib_main_t * vm, u32 * ring, u32 start,
670 u32 ring_size, u32 n_buffers)
674 ASSERT (n_buffers <= ring_size);
676 if (PREDICT_TRUE (start + n_buffers <= ring_size))
677 return vlib_buffer_alloc (vm, ring + start, n_buffers);
679 n_alloc = vlib_buffer_alloc (vm, ring + start, ring_size - start);
681 if (PREDICT_TRUE (n_alloc == ring_size - start))
682 n_alloc += vlib_buffer_alloc (vm, ring, n_buffers - n_alloc);
687 /** \brief Allocate buffers into ring from specific buffer pool
689 @param vm - (vlib_main_t *) vlib main data structure pointer
690 @param buffers - (u32 * ) buffer index ring
691 @param start - (u32) first slot in the ring
692 @param ring_size - (u32) ring size
693 @param n_buffers - (u32) number of buffers requested
694 @return - (u32) number of buffers actually allocated, may be
695 less than the number requested or zero
697 always_inline __clib_warn_unused_result u32
698 vlib_buffer_alloc_to_ring_from_pool (vlib_main_t * vm, u32 * ring, u32 start,
699 u32 ring_size, u32 n_buffers,
700 u8 buffer_pool_index)
704 ASSERT (n_buffers <= ring_size);
706 if (PREDICT_TRUE (start + n_buffers <= ring_size))
707 return vlib_buffer_alloc_from_pool (vm, ring + start, n_buffers,
710 n_alloc = vlib_buffer_alloc_from_pool (vm, ring + start, ring_size - start,
713 if (PREDICT_TRUE (n_alloc == ring_size - start))
714 n_alloc += vlib_buffer_alloc_from_pool (vm, ring, n_buffers - n_alloc,
720 static_always_inline void
721 vlib_buffer_pool_put (vlib_main_t * vm, u8 buffer_pool_index,
722 u32 * buffers, u32 n_buffers)
724 vlib_buffer_main_t *bm = vm->buffer_main;
725 vlib_buffer_pool_t *bp = vlib_get_buffer_pool (vm, buffer_pool_index);
726 vlib_buffer_pool_thread_t *bpt = vec_elt_at_index (bp->threads,
728 u32 n_cached, n_empty;
731 vlib_buffer_validate_alloc_free (vm, buffers, n_buffers,
732 VLIB_BUFFER_KNOWN_ALLOCATED);
733 if (PREDICT_FALSE (bm->free_callback_fn != 0))
734 bm->free_callback_fn (vm, buffer_pool_index, buffers, n_buffers);
736 n_cached = bpt->n_cached;
737 n_empty = VLIB_BUFFER_POOL_PER_THREAD_CACHE_SZ - n_cached;
738 if (n_buffers <= n_empty)
740 vlib_buffer_copy_indices (bpt->cached_buffers + n_cached,
742 bpt->n_cached = n_cached + n_buffers;
746 vlib_buffer_copy_indices (bpt->cached_buffers + n_cached,
747 buffers + n_buffers - n_empty, n_empty);
748 bpt->n_cached = VLIB_BUFFER_POOL_PER_THREAD_CACHE_SZ;
750 clib_spinlock_lock (&bp->lock);
751 vlib_buffer_copy_indices (bp->buffers + bp->n_avail, buffers,
752 n_buffers - n_empty);
753 bp->n_avail += n_buffers - n_empty;
754 clib_spinlock_unlock (&bp->lock);
757 static_always_inline void
758 vlib_buffer_free_inline (vlib_main_t * vm, u32 * buffers, u32 n_buffers,
761 const int queue_size = 128;
762 vlib_buffer_pool_t *bp = 0;
763 u8 buffer_pool_index = ~0;
764 u32 n_queue = 0, queue[queue_size + 4];
765 vlib_buffer_t bt = { };
766 #if defined(CLIB_HAVE_VEC128)
767 vlib_buffer_t bpi_mask = {.buffer_pool_index = ~0 };
768 vlib_buffer_t bpi_vec = {};
769 vlib_buffer_t flags_refs_mask = {
770 .flags = VLIB_BUFFER_NEXT_PRESENT,
775 if (PREDICT_FALSE (n_buffers == 0))
778 vlib_buffer_t *b = vlib_get_buffer (vm, buffers[0]);
779 buffer_pool_index = b->buffer_pool_index;
780 bp = vlib_get_buffer_pool (vm, buffer_pool_index);
781 vlib_buffer_copy_template (&bt, &bp->buffer_template);
782 #if defined(CLIB_HAVE_VEC128)
783 bpi_vec.buffer_pool_index = buffer_pool_index;
789 u32 bi, sum = 0, flags, next;
794 vlib_get_buffers (vm, buffers, b, 4);
798 vlib_get_buffers (vm, buffers + 8, b + 4, 4);
799 vlib_prefetch_buffer_header (b[4], LOAD);
800 vlib_prefetch_buffer_header (b[5], LOAD);
801 vlib_prefetch_buffer_header (b[6], LOAD);
802 vlib_prefetch_buffer_header (b[7], LOAD);
805 #if defined(CLIB_HAVE_VEC128)
806 u8x16 p0, p1, p2, p3, r;
807 p0 = u8x16_load_unaligned (b[0]);
808 p1 = u8x16_load_unaligned (b[1]);
809 p2 = u8x16_load_unaligned (b[2]);
810 p3 = u8x16_load_unaligned (b[3]);
812 r = p0 ^ bpi_vec.as_u8x16[0];
813 r |= p1 ^ bpi_vec.as_u8x16[0];
814 r |= p2 ^ bpi_vec.as_u8x16[0];
815 r |= p3 ^ bpi_vec.as_u8x16[0];
816 r &= bpi_mask.as_u8x16[0];
817 r |= (p0 | p1 | p2 | p3) & flags_refs_mask.as_u8x16[0];
819 sum = !u8x16_is_all_zero (r);
825 sum &= VLIB_BUFFER_NEXT_PRESENT;
826 sum += b[0]->ref_count - 1;
827 sum += b[1]->ref_count - 1;
828 sum += b[2]->ref_count - 1;
829 sum += b[3]->ref_count - 1;
830 sum |= b[0]->buffer_pool_index ^ buffer_pool_index;
831 sum |= b[1]->buffer_pool_index ^ buffer_pool_index;
832 sum |= b[2]->buffer_pool_index ^ buffer_pool_index;
833 sum |= b[3]->buffer_pool_index ^ buffer_pool_index;
839 vlib_buffer_copy_indices (queue + n_queue, buffers, 4);
840 vlib_buffer_copy_template (b[0], &bt);
841 vlib_buffer_copy_template (b[1], &bt);
842 vlib_buffer_copy_template (b[2], &bt);
843 vlib_buffer_copy_template (b[3], &bt);
846 vlib_buffer_validate (vm, b[0]);
847 vlib_buffer_validate (vm, b[1]);
848 vlib_buffer_validate (vm, b[2]);
849 vlib_buffer_validate (vm, b[3]);
851 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[0]);
852 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[1]);
853 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[2]);
854 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[3]);
856 if (n_queue >= queue_size)
858 vlib_buffer_pool_put (vm, buffer_pool_index, queue, n_queue);
869 b[0] = vlib_get_buffer (vm, bi);
871 next = b[0]->next_buffer;
873 if (PREDICT_FALSE (buffer_pool_index != b[0]->buffer_pool_index))
878 vlib_buffer_pool_put (vm, buffer_pool_index, queue, n_queue);
882 buffer_pool_index = b[0]->buffer_pool_index;
883 #if defined(CLIB_HAVE_VEC128)
884 bpi_vec.buffer_pool_index = buffer_pool_index;
886 bp = vlib_get_buffer_pool (vm, buffer_pool_index);
887 vlib_buffer_copy_template (&bt, &bp->buffer_template);
890 vlib_buffer_validate (vm, b[0]);
892 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[0]);
894 if (clib_atomic_sub_fetch (&b[0]->ref_count, 1) == 0)
896 vlib_buffer_copy_template (b[0], &bt);
897 queue[n_queue++] = bi;
900 if (n_queue == queue_size)
902 vlib_buffer_pool_put (vm, buffer_pool_index, queue, queue_size);
906 if (maybe_next && (flags & VLIB_BUFFER_NEXT_PRESENT))
917 vlib_buffer_pool_put (vm, buffer_pool_index, queue, n_queue);
921 /** \brief Free buffers
922 Frees the entire buffer chain for each buffer
924 @param vm - (vlib_main_t *) vlib main data structure pointer
925 @param buffers - (u32 * ) buffer index array
926 @param n_buffers - (u32) number of buffers to free
930 vlib_buffer_free (vlib_main_t * vm,
931 /* pointer to first buffer */
933 /* number of buffers to free */
936 vlib_buffer_free_inline (vm, buffers, n_buffers, /* maybe next */ 1);
939 /** \brief Free buffers, does not free the buffer chain for each buffer
941 @param vm - (vlib_main_t *) vlib main data structure pointer
942 @param buffers - (u32 * ) buffer index array
943 @param n_buffers - (u32) number of buffers to free
947 vlib_buffer_free_no_next (vlib_main_t * vm,
948 /* pointer to first buffer */
950 /* number of buffers to free */
953 vlib_buffer_free_inline (vm, buffers, n_buffers, /* maybe next */ 0);
956 /** \brief Free one buffer
957 Shorthand to free a single buffer chain.
959 @param vm - (vlib_main_t *) vlib main data structure pointer
960 @param buffer_index - (u32) buffer index to free
963 vlib_buffer_free_one (vlib_main_t * vm, u32 buffer_index)
965 vlib_buffer_free_inline (vm, &buffer_index, 1, /* maybe next */ 1);
968 /** \brief Free buffers from ring
970 @param vm - (vlib_main_t *) vlib main data structure pointer
971 @param buffers - (u32 * ) buffer index ring
972 @param start - (u32) first slot in the ring
973 @param ring_size - (u32) ring size
974 @param n_buffers - (u32) number of buffers
977 vlib_buffer_free_from_ring (vlib_main_t * vm, u32 * ring, u32 start,
978 u32 ring_size, u32 n_buffers)
980 ASSERT (n_buffers <= ring_size);
982 if (PREDICT_TRUE (start + n_buffers <= ring_size))
984 vlib_buffer_free (vm, ring + start, n_buffers);
988 vlib_buffer_free (vm, ring + start, ring_size - start);
989 vlib_buffer_free (vm, ring, n_buffers - (ring_size - start));
993 /** \brief Free buffers from ring without freeing tail buffers
995 @param vm - (vlib_main_t *) vlib main data structure pointer
996 @param buffers - (u32 * ) buffer index ring
997 @param start - (u32) first slot in the ring
998 @param ring_size - (u32) ring size
999 @param n_buffers - (u32) number of buffers
1002 vlib_buffer_free_from_ring_no_next (vlib_main_t * vm, u32 * ring, u32 start,
1003 u32 ring_size, u32 n_buffers)
1005 ASSERT (n_buffers <= ring_size);
1007 if (PREDICT_TRUE (start + n_buffers <= ring_size))
1009 vlib_buffer_free_no_next (vm, ring + start, n_buffers);
1013 vlib_buffer_free_no_next (vm, ring + start, ring_size - start);
1014 vlib_buffer_free_no_next (vm, ring, n_buffers - (ring_size - start));
1018 /* Append given data to end of buffer, possibly allocating new buffers. */
1019 int vlib_buffer_add_data (vlib_main_t * vm, u32 * buffer_index, void *data,
1022 /* Define vlib_buffer and vnet_buffer flags bits preserved for copy/clone */
1023 #define VLIB_BUFFER_COPY_CLONE_FLAGS_MASK \
1024 (VLIB_BUFFER_NEXT_PRESENT | VLIB_BUFFER_TOTAL_LENGTH_VALID | \
1025 VLIB_BUFFER_IS_TRACED | ~VLIB_BUFFER_FLAGS_ALL)
1027 /* duplicate all buffers in chain */
1028 always_inline vlib_buffer_t *
1029 vlib_buffer_copy (vlib_main_t * vm, vlib_buffer_t * b)
1031 vlib_buffer_t *s, *d, *fd;
1032 uword n_alloc, n_buffers = 1;
1033 u32 flag_mask = VLIB_BUFFER_COPY_CLONE_FLAGS_MASK;
1037 while (s->flags & VLIB_BUFFER_NEXT_PRESENT)
1040 s = vlib_get_buffer (vm, s->next_buffer);
1042 u32 new_buffers[n_buffers];
1044 n_alloc = vlib_buffer_alloc (vm, new_buffers, n_buffers);
1046 /* No guarantee that we'll get all the buffers we asked for */
1047 if (PREDICT_FALSE (n_alloc < n_buffers))
1050 vlib_buffer_free (vm, new_buffers, n_alloc);
1056 fd = d = vlib_get_buffer (vm, new_buffers[0]);
1057 d->current_data = s->current_data;
1058 d->current_length = s->current_length;
1059 d->flags = s->flags & flag_mask;
1060 d->trace_handle = s->trace_handle;
1061 d->total_length_not_including_first_buffer =
1062 s->total_length_not_including_first_buffer;
1063 clib_memcpy_fast (d->opaque, s->opaque, sizeof (s->opaque));
1064 clib_memcpy_fast (d->opaque2, s->opaque2, sizeof (s->opaque2));
1065 clib_memcpy_fast (vlib_buffer_get_current (d),
1066 vlib_buffer_get_current (s), s->current_length);
1069 for (i = 1; i < n_buffers; i++)
1072 d->next_buffer = new_buffers[i];
1074 s = vlib_get_buffer (vm, s->next_buffer);
1075 d = vlib_get_buffer (vm, new_buffers[i]);
1076 d->current_data = s->current_data;
1077 d->current_length = s->current_length;
1078 clib_memcpy_fast (vlib_buffer_get_current (d),
1079 vlib_buffer_get_current (s), s->current_length);
1080 d->flags = s->flags & flag_mask;
1086 /* duplicate first buffer in chain */
1087 always_inline vlib_buffer_t *
1088 vlib_buffer_copy_no_chain (vlib_main_t * vm, vlib_buffer_t * b, u32 * di)
1092 if ((vlib_buffer_alloc (vm, di, 1)) != 1)
1095 d = vlib_get_buffer (vm, *di);
1097 d->current_data = b->current_data;
1098 d->current_length = b->current_length;
1099 clib_memcpy_fast (d->opaque, b->opaque, sizeof (b->opaque));
1100 clib_memcpy_fast (d->opaque2, b->opaque2, sizeof (b->opaque2));
1101 clib_memcpy_fast (vlib_buffer_get_current (d),
1102 vlib_buffer_get_current (b), b->current_length);
1107 /* \brief Move packet from current position to offset position in buffer.
1108 Only work for small packet using one buffer with room to fit the move
1109 @param vm - (vlib_main_t *) vlib main data structure pointer
1110 @param b - (vlib_buffer_t *) pointer to buffer
1111 @param offset - (i16) position to move the packet in buffer
1114 vlib_buffer_move (vlib_main_t * vm, vlib_buffer_t * b, i16 offset)
1116 ASSERT ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0);
1117 ASSERT (offset + VLIB_BUFFER_PRE_DATA_SIZE >= 0);
1118 ASSERT (offset + b->current_length <
1119 vlib_buffer_get_default_data_size (vm));
1121 u8 *source = vlib_buffer_get_current (b);
1122 b->current_data = offset;
1123 u8 *destination = vlib_buffer_get_current (b);
1124 u16 length = b->current_length;
1126 if (source + length <= destination) /* no overlap */
1127 clib_memcpy_fast (destination, source, length);
1129 memmove (destination, source, length);
1132 /** \brief Create a maximum of 256 clones of buffer and store them
1133 in the supplied array
1135 @param vm - (vlib_main_t *) vlib main data structure pointer
1136 @param src_buffer - (u32) source buffer index
1137 @param buffers - (u32 * ) buffer index array
1138 @param n_buffers - (u16) number of buffer clones requested (<=256)
1139 @param head_end_offset - (u16) offset relative to current position
1140 where packet head ends
1141 @param offset - (i16) copy packet head at current position if 0,
1142 else at offset position to change headroom space as specified
1143 @return - (u16) number of buffers actually cloned, may be
1144 less than the number requested or zero
1147 vlib_buffer_clone_256 (vlib_main_t * vm, u32 src_buffer, u32 * buffers,
1148 u16 n_buffers, u16 head_end_offset, i16 offset)
1151 vlib_buffer_t *s = vlib_get_buffer (vm, src_buffer);
1153 ASSERT (s->ref_count == 1);
1155 ASSERT (n_buffers <= 256);
1156 ASSERT (offset + VLIB_BUFFER_PRE_DATA_SIZE >= 0);
1157 ASSERT ((offset + head_end_offset) <
1158 vlib_buffer_get_default_data_size (vm));
1160 if (s->current_length <= head_end_offset + CLIB_CACHE_LINE_BYTES * 2)
1162 buffers[0] = src_buffer;
1164 vlib_buffer_move (vm, s, offset);
1166 for (i = 1; i < n_buffers; i++)
1169 d = vlib_buffer_copy (vm, s);
1172 buffers[i] = vlib_get_buffer_index (vm, d);
1178 if (PREDICT_FALSE ((n_buffers == 1) && (offset == 0)))
1180 buffers[0] = src_buffer;
1184 n_buffers = vlib_buffer_alloc_from_pool (vm, buffers, n_buffers,
1185 s->buffer_pool_index);
1187 for (i = 0; i < n_buffers; i++)
1189 vlib_buffer_t *d = vlib_get_buffer (vm, buffers[i]);
1191 d->current_data = offset;
1193 d->current_data = s->current_data;
1195 d->current_length = head_end_offset;
1196 ASSERT (d->buffer_pool_index == s->buffer_pool_index);
1198 d->total_length_not_including_first_buffer = s->current_length -
1200 if (PREDICT_FALSE (s->flags & VLIB_BUFFER_NEXT_PRESENT))
1202 d->total_length_not_including_first_buffer +=
1203 s->total_length_not_including_first_buffer;
1205 d->flags = (s->flags & VLIB_BUFFER_COPY_CLONE_FLAGS_MASK) |
1206 VLIB_BUFFER_NEXT_PRESENT;
1207 d->trace_handle = s->trace_handle;
1208 clib_memcpy_fast (d->opaque, s->opaque, sizeof (s->opaque));
1209 clib_memcpy_fast (d->opaque2, s->opaque2, sizeof (s->opaque2));
1210 clib_memcpy_fast (vlib_buffer_get_current (d),
1211 vlib_buffer_get_current (s), head_end_offset);
1212 d->next_buffer = src_buffer;
1214 vlib_buffer_advance (s, head_end_offset);
1215 s->ref_count = n_buffers ? n_buffers : s->ref_count;
1216 while (s->flags & VLIB_BUFFER_NEXT_PRESENT)
1218 s = vlib_get_buffer (vm, s->next_buffer);
1219 s->ref_count = n_buffers ? n_buffers : s->ref_count;
1225 /** \brief Create multiple clones of buffer and store them
1226 in the supplied array
1228 @param vm - (vlib_main_t *) vlib main data structure pointer
1229 @param src_buffer - (u32) source buffer index
1230 @param buffers - (u32 * ) buffer index array
1231 @param n_buffers - (u16) number of buffer clones requested (<=256)
1232 @param head_end_offset - (u16) offset relative to current position
1233 where packet head ends
1234 @param offset - (i16) copy packet head at current position if 0,
1235 else at offset position to change headroom space as specified
1236 @return - (u16) number of buffers actually cloned, may be
1237 less than the number requested or zero
1240 vlib_buffer_clone_at_offset (vlib_main_t * vm, u32 src_buffer, u32 * buffers,
1241 u16 n_buffers, u16 head_end_offset, i16 offset)
1243 vlib_buffer_t *s = vlib_get_buffer (vm, src_buffer);
1246 while (n_buffers > 256)
1248 vlib_buffer_t *copy;
1249 copy = vlib_buffer_copy (vm, s);
1250 n_cloned += vlib_buffer_clone_256 (vm,
1251 vlib_get_buffer_index (vm, copy),
1252 (buffers + n_cloned),
1253 256, head_end_offset, offset);
1256 n_cloned += vlib_buffer_clone_256 (vm, src_buffer,
1258 n_buffers, head_end_offset, offset);
1263 /** \brief Create multiple clones of buffer and store them
1264 in the supplied array
1266 @param vm - (vlib_main_t *) vlib main data structure pointer
1267 @param src_buffer - (u32) source buffer index
1268 @param buffers - (u32 * ) buffer index array
1269 @param n_buffers - (u16) number of buffer clones requested (<=256)
1270 @param head_end_offset - (u16) offset relative to current position
1271 where packet head ends
1272 @return - (u16) number of buffers actually cloned, may be
1273 less than the number requested or zero
1276 vlib_buffer_clone (vlib_main_t * vm, u32 src_buffer, u32 * buffers,
1277 u16 n_buffers, u16 head_end_offset)
1279 return vlib_buffer_clone_at_offset (vm, src_buffer, buffers, n_buffers,
1280 head_end_offset, 0);
1283 /** \brief Attach cloned tail to the buffer
1285 @param vm - (vlib_main_t *) vlib main data structure pointer
1286 @param head - (vlib_buffer_t *) head buffer
1287 @param tail - (Vlib buffer_t *) tail buffer to clone and attach to head
1291 vlib_buffer_attach_clone (vlib_main_t * vm, vlib_buffer_t * head,
1292 vlib_buffer_t * tail)
1294 ASSERT ((head->flags & VLIB_BUFFER_NEXT_PRESENT) == 0);
1295 ASSERT (head->buffer_pool_index == tail->buffer_pool_index);
1297 head->flags |= VLIB_BUFFER_NEXT_PRESENT;
1298 head->flags &= ~VLIB_BUFFER_TOTAL_LENGTH_VALID;
1299 head->flags &= ~VLIB_BUFFER_EXT_HDR_VALID;
1300 head->flags |= (tail->flags & VLIB_BUFFER_TOTAL_LENGTH_VALID);
1301 head->next_buffer = vlib_get_buffer_index (vm, tail);
1302 head->total_length_not_including_first_buffer = tail->current_length +
1303 tail->total_length_not_including_first_buffer;
1306 clib_atomic_add_fetch (&tail->ref_count, 1);
1308 if (tail->flags & VLIB_BUFFER_NEXT_PRESENT)
1310 tail = vlib_get_buffer (vm, tail->next_buffer);
1315 /* Initializes the buffer as an empty packet with no chained buffers. */
1317 vlib_buffer_chain_init (vlib_buffer_t * first)
1319 first->total_length_not_including_first_buffer = 0;
1320 first->current_length = 0;
1321 first->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
1322 first->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
1325 /* The provided next_bi buffer index is appended to the end of the packet. */
1326 always_inline vlib_buffer_t *
1327 vlib_buffer_chain_buffer (vlib_main_t * vm, vlib_buffer_t * last, u32 next_bi)
1329 vlib_buffer_t *next_buffer = vlib_get_buffer (vm, next_bi);
1330 last->next_buffer = next_bi;
1331 last->flags |= VLIB_BUFFER_NEXT_PRESENT;
1332 next_buffer->current_length = 0;
1333 next_buffer->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
1337 /* Increases or decreases the packet length.
1338 * It does not allocate or deallocate new buffers.
1339 * Therefore, the added length must be compatible
1340 * with the last buffer. */
1342 vlib_buffer_chain_increase_length (vlib_buffer_t * first,
1343 vlib_buffer_t * last, i32 len)
1345 last->current_length += len;
1347 first->total_length_not_including_first_buffer += len;
1350 /* Copy data to the end of the packet and increases its length.
1351 * It does not allocate new buffers.
1352 * Returns the number of copied bytes. */
1354 vlib_buffer_chain_append_data (vlib_main_t * vm,
1355 vlib_buffer_t * first,
1356 vlib_buffer_t * last, void *data, u16 data_len)
1358 u32 n_buffer_bytes = vlib_buffer_get_default_data_size (vm);
1359 ASSERT (n_buffer_bytes >= last->current_length + last->current_data);
1360 u16 len = clib_min (data_len,
1361 n_buffer_bytes - last->current_length -
1362 last->current_data);
1363 clib_memcpy_fast (vlib_buffer_get_current (last) + last->current_length,
1365 vlib_buffer_chain_increase_length (first, last, len);
1369 /* Copy data to the end of the packet and increases its length.
1370 * Allocates additional buffers from the free list if necessary.
1371 * Returns the number of copied bytes.
1372 * 'last' value is modified whenever new buffers are allocated and
1373 * chained and points to the last buffer in the chain. */
1375 vlib_buffer_chain_append_data_with_alloc (vlib_main_t * vm,
1376 vlib_buffer_t * first,
1377 vlib_buffer_t ** last, void *data,
1379 void vlib_buffer_chain_validate (vlib_main_t * vm, vlib_buffer_t * first);
1381 format_function_t format_vlib_buffer, format_vlib_buffer_and_data,
1382 format_vlib_buffer_contents, format_vlib_buffer_no_chain;
1386 /* Vector of packet data. */
1389 /* Number of buffers to allocate in each call to allocator. */
1390 u32 min_n_buffers_each_alloc;
1393 } vlib_packet_template_t;
1395 void vlib_packet_template_init (vlib_main_t * vm,
1396 vlib_packet_template_t * t,
1398 uword n_packet_data_bytes,
1399 uword min_n_buffers_each_alloc,
1402 void *vlib_packet_template_get_packet (vlib_main_t * vm,
1403 vlib_packet_template_t * t,
1407 vlib_packet_template_free (vlib_main_t * vm, vlib_packet_template_t * t)
1409 vec_free (t->packet_data);
1413 vlib_buffer_space_left_at_end (vlib_main_t * vm, vlib_buffer_t * b)
1415 return b->data + vlib_buffer_get_default_data_size (vm) -
1416 ((u8 *) vlib_buffer_get_current (b) + b->current_length);
1419 #define VLIB_BUFFER_LINEARIZE_MAX 64
1422 vlib_buffer_chain_linearize (vlib_main_t * vm, vlib_buffer_t * b)
1424 vlib_buffer_t *dst_b;
1425 u32 n_buffers = 1, to_free = 0;
1426 u16 rem_len, dst_len, data_size, src_len = 0;
1429 if (PREDICT_TRUE ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0))
1432 ASSERT (1 == b->ref_count);
1433 if (PREDICT_FALSE (1 != b->ref_count))
1436 data_size = vlib_buffer_get_default_data_size (vm);
1437 rem_len = vlib_buffer_length_in_chain (vm, b) - b->current_length;
1440 dst = vlib_buffer_get_tail (dst_b);
1441 dst_len = vlib_buffer_space_left_at_end (vm, dst_b);
1443 b->total_length_not_including_first_buffer -= dst_len;
1449 while (0 == src_len)
1451 ASSERT (b->flags & VLIB_BUFFER_NEXT_PRESENT);
1452 if (PREDICT_FALSE (!(b->flags & VLIB_BUFFER_NEXT_PRESENT)))
1453 break; /* malformed chained buffer */
1455 b = vlib_get_buffer (vm, b->next_buffer);
1456 src = vlib_buffer_get_current (b);
1457 src_len = b->current_length;
1462 ASSERT (dst_b->flags & VLIB_BUFFER_NEXT_PRESENT);
1463 if (PREDICT_FALSE (!(dst_b->flags & VLIB_BUFFER_NEXT_PRESENT)))
1464 break; /* malformed chained buffer */
1466 vlib_buffer_t *next_dst_b = vlib_get_buffer (vm, dst_b->next_buffer);
1468 if (PREDICT_TRUE (1 == next_dst_b->ref_count))
1470 /* normal case: buffer is not cloned, just use it */
1475 /* cloned buffer, build a new dest chain from there */
1476 vlib_buffer_t *bufs[VLIB_BUFFER_LINEARIZE_MAX];
1477 u32 bis[VLIB_BUFFER_LINEARIZE_MAX + 1];
1478 const int n = (rem_len + data_size - 1) / data_size;
1482 ASSERT (n <= VLIB_BUFFER_LINEARIZE_MAX);
1483 if (PREDICT_FALSE (n > VLIB_BUFFER_LINEARIZE_MAX))
1486 n_alloc = vlib_buffer_alloc (vm, bis, n);
1487 if (PREDICT_FALSE (n_alloc != n))
1489 vlib_buffer_free (vm, bis, n_alloc);
1493 vlib_get_buffers (vm, bis, bufs, n);
1495 for (i = 0; i < n - 1; i++)
1497 bufs[i]->flags |= VLIB_BUFFER_NEXT_PRESENT;
1498 bufs[i]->next_buffer = bis[i + 1];
1501 to_free = dst_b->next_buffer;
1502 dst_b->next_buffer = bis[0];
1508 dst_b->current_data = clib_min (0, dst_b->current_data);
1509 dst_b->current_length = 0;
1511 dst = dst_b->data + dst_b->current_data;
1512 dst_len = data_size - dst_b->current_data;
1515 copy_len = clib_min (src_len, dst_len);
1517 if (PREDICT_TRUE (src == dst))
1521 else if (src + copy_len > dst && dst + copy_len > src)
1523 /* src and dst overlap */
1524 ASSERT (b == dst_b);
1525 memmove (dst, src, copy_len);
1529 clib_memcpy_fast (dst, src, copy_len);
1532 dst_b->current_length += copy_len;
1536 dst_len -= copy_len;
1537 src_len -= copy_len;
1538 rem_len -= copy_len;
1541 /* in case of a malformed chain buffer, we'll exit early from the loop. */
1542 ASSERT (0 == rem_len);
1543 b->total_length_not_including_first_buffer -= rem_len;
1546 vlib_buffer_free_one (vm, to_free);
1548 if (dst_b->flags & VLIB_BUFFER_NEXT_PRESENT)
1550 /* the resulting chain is smaller than the original, cut it there */
1551 dst_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
1552 vlib_buffer_free_one (vm, dst_b->next_buffer);
1555 /* no longer a chained buffer */
1556 dst_b->flags &= ~VLIB_BUFFER_TOTAL_LENGTH_VALID;
1557 dst_b->total_length_not_including_first_buffer = 0;
1564 #endif /* included_vlib_buffer_funcs_h */
1567 * fd.io coding-style-patch-verification: ON
1570 * eval: (c-set-style "gnu")