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>
47 vlib buffer access methods.
51 /** \brief Translate buffer index into buffer pointer
53 @param vm - (vlib_main_t *) vlib main data structure pointer
54 @param buffer_index - (u32) buffer index
55 @return - (vlib_buffer_t *) buffer pointer
57 always_inline vlib_buffer_t *
58 vlib_get_buffer (vlib_main_t * vm, u32 buffer_index)
60 vlib_buffer_main_t *bm = vm->buffer_main;
61 uword offset = ((uword) buffer_index) << CLIB_LOG2_CACHE_LINE_BYTES;
62 ASSERT (offset < bm->buffer_mem_size);
64 return uword_to_pointer (bm->buffer_mem_start + offset, void *);
67 static_always_inline void
68 vlib_buffer_copy_indices (u32 * dst, u32 * src, u32 n_indices)
70 clib_memcpy_fast (dst, src, n_indices * sizeof (u32));
73 STATIC_ASSERT_OFFSET_OF (vlib_buffer_t, template_end, 64);
74 static_always_inline void
75 vlib_buffer_copy_template (vlib_buffer_t * b, vlib_buffer_t * bt)
77 #if defined CLIB_HAVE_VEC512
78 b->as_u8x64[0] = bt->as_u8x64[0];
79 #elif defined (CLIB_HAVE_VEC256)
80 b->as_u8x32[0] = bt->as_u8x32[0];
81 b->as_u8x32[1] = bt->as_u8x32[1];
82 #elif defined (CLIB_HAVE_VEC128)
83 b->as_u8x16[0] = bt->as_u8x16[0];
84 b->as_u8x16[1] = bt->as_u8x16[1];
85 b->as_u8x16[2] = bt->as_u8x16[2];
86 b->as_u8x16[3] = bt->as_u8x16[3];
88 clib_memcpy_fast (b, bt, 64);
93 vlib_buffer_pool_get_default_for_numa (vlib_main_t * vm, u32 numa_node)
95 ASSERT (numa_node < vm->buffer_main->n_numa_nodes);
99 /** \brief Translate array of buffer indices into buffer pointers with offset
101 @param vm - (vlib_main_t *) vlib main data structure pointer
102 @param bi - (u32 *) array of buffer indices
103 @param b - (void **) array to store buffer pointers
104 @param count - (uword) number of elements
105 @param offset - (i32) offset applied to each pointer
107 static_always_inline void
108 vlib_get_buffers_with_offset (vlib_main_t * vm, u32 * bi, void **b, int count,
111 #if defined (CLIB_HAVE_VEC256) || defined (CLIB_HAVE_VEC128)
112 uword buffer_mem_start = vm->buffer_main->buffer_mem_start;
114 #ifdef CLIB_HAVE_VEC256
115 u64x4 off = u64x4_splat (buffer_mem_start + offset);
116 /* if count is not const, compiler will not unroll while loop
117 se we maintain two-in-parallel variant */
120 u64x4 b0 = u32x4_extend_to_u64x4 (u32x4_load_unaligned (bi));
121 u64x4 b1 = u32x4_extend_to_u64x4 (u32x4_load_unaligned (bi + 4));
122 /* shift and add to get vlib_buffer_t pointer */
123 u64x4_store_unaligned ((b0 << CLIB_LOG2_CACHE_LINE_BYTES) + off, b);
124 u64x4_store_unaligned ((b1 << CLIB_LOG2_CACHE_LINE_BYTES) + off, b + 4);
132 #ifdef CLIB_HAVE_VEC256
133 u64x4 b0 = u32x4_extend_to_u64x4 (u32x4_load_unaligned (bi));
134 /* shift and add to get vlib_buffer_t pointer */
135 u64x4_store_unaligned ((b0 << CLIB_LOG2_CACHE_LINE_BYTES) + off, b);
136 #elif defined (CLIB_HAVE_VEC128)
137 u64x2 off = u64x2_splat (buffer_mem_start + offset);
138 u32x4 bi4 = u32x4_load_unaligned (bi);
139 u64x2 b0 = u32x4_extend_to_u64x2 ((u32x4) bi4);
140 #if defined (__aarch64__)
141 u64x2 b1 = u32x4_extend_to_u64x2_high ((u32x4) bi4);
143 bi4 = u32x4_shuffle (bi4, 2, 3, 0, 1);
144 u64x2 b1 = u32x4_extend_to_u64x2 ((u32x4) bi4);
146 u64x2_store_unaligned ((b0 << CLIB_LOG2_CACHE_LINE_BYTES) + off, b);
147 u64x2_store_unaligned ((b1 << CLIB_LOG2_CACHE_LINE_BYTES) + off, b + 2);
149 b[0] = ((u8 *) vlib_get_buffer (vm, bi[0])) + offset;
150 b[1] = ((u8 *) vlib_get_buffer (vm, bi[1])) + offset;
151 b[2] = ((u8 *) vlib_get_buffer (vm, bi[2])) + offset;
152 b[3] = ((u8 *) vlib_get_buffer (vm, bi[3])) + offset;
160 b[0] = ((u8 *) vlib_get_buffer (vm, bi[0])) + offset;
167 /** \brief Translate array of buffer indices into buffer pointers
169 @param vm - (vlib_main_t *) vlib main data structure pointer
170 @param bi - (u32 *) array of buffer indices
171 @param b - (vlib_buffer_t **) array to store buffer pointers
172 @param count - (uword) number of elements
175 static_always_inline void
176 vlib_get_buffers (vlib_main_t * vm, u32 * bi, vlib_buffer_t ** b, int count)
178 vlib_get_buffers_with_offset (vm, bi, (void **) b, count, 0);
181 /** \brief Translate buffer pointer into buffer index
183 @param vm - (vlib_main_t *) vlib main data structure pointer
184 @param p - (void *) buffer pointer
185 @return - (u32) buffer index
189 vlib_get_buffer_index (vlib_main_t * vm, void *p)
191 vlib_buffer_main_t *bm = vm->buffer_main;
192 uword offset = pointer_to_uword (p) - bm->buffer_mem_start;
193 ASSERT (pointer_to_uword (p) >= bm->buffer_mem_start);
194 ASSERT (offset < bm->buffer_mem_size);
195 ASSERT ((offset % (1 << CLIB_LOG2_CACHE_LINE_BYTES)) == 0);
196 return offset >> CLIB_LOG2_CACHE_LINE_BYTES;
199 /** \brief Translate array of buffer pointers into buffer indices with offset
201 @param vm - (vlib_main_t *) vlib main data structure pointer
202 @param b - (void **) array of buffer pointers
203 @param bi - (u32 *) array to store buffer indices
204 @param count - (uword) number of elements
205 @param offset - (i32) offset applied to each pointer
207 static_always_inline void
208 vlib_get_buffer_indices_with_offset (vlib_main_t * vm, void **b, u32 * bi,
209 uword count, i32 offset)
211 #ifdef CLIB_HAVE_VEC256
212 u32x8 mask = { 0, 2, 4, 6, 1, 3, 5, 7 };
213 u64x4 off4 = u64x4_splat (vm->buffer_main->buffer_mem_start - offset);
217 /* load 4 pointers into 256-bit register */
218 u64x4 v0 = u64x4_load_unaligned (b);
219 u64x4 v1 = u64x4_load_unaligned (b + 4);
225 v0 >>= CLIB_LOG2_CACHE_LINE_BYTES;
226 v1 >>= CLIB_LOG2_CACHE_LINE_BYTES;
228 /* permute 256-bit register so lower u32s of each buffer index are
229 * placed into lower 128-bits */
230 v2 = u32x8_permute ((u32x8) v0, mask);
231 v3 = u32x8_permute ((u32x8) v1, mask);
233 /* extract lower 128-bits and save them to the array of buffer indices */
234 u32x4_store_unaligned (u32x8_extract_lo (v2), bi);
235 u32x4_store_unaligned (u32x8_extract_lo (v3), bi + 4);
243 /* equivalent non-nector implementation */
244 bi[0] = vlib_get_buffer_index (vm, ((u8 *) b[0]) + offset);
245 bi[1] = vlib_get_buffer_index (vm, ((u8 *) b[1]) + offset);
246 bi[2] = vlib_get_buffer_index (vm, ((u8 *) b[2]) + offset);
247 bi[3] = vlib_get_buffer_index (vm, ((u8 *) b[3]) + offset);
254 bi[0] = vlib_get_buffer_index (vm, ((u8 *) b[0]) + offset);
261 /** \brief Translate array of buffer pointers into buffer indices
263 @param vm - (vlib_main_t *) vlib main data structure pointer
264 @param b - (vlib_buffer_t **) array of buffer pointers
265 @param bi - (u32 *) array to store buffer indices
266 @param count - (uword) number of elements
268 static_always_inline void
269 vlib_get_buffer_indices (vlib_main_t * vm, vlib_buffer_t ** b, u32 * bi,
272 vlib_get_buffer_indices_with_offset (vm, (void **) b, bi, count, 0);
275 /** \brief Get next buffer in buffer linklist, or zero for end of list.
277 @param vm - (vlib_main_t *) vlib main data structure pointer
278 @param b - (void *) buffer pointer
279 @return - (vlib_buffer_t *) next buffer, or NULL
281 always_inline vlib_buffer_t *
282 vlib_get_next_buffer (vlib_main_t * vm, vlib_buffer_t * b)
284 return (b->flags & VLIB_BUFFER_NEXT_PRESENT
285 ? vlib_get_buffer (vm, b->next_buffer) : 0);
288 uword vlib_buffer_length_in_chain_slow_path (vlib_main_t * vm,
289 vlib_buffer_t * b_first);
291 /** \brief Get length in bytes of the buffer chain
293 @param vm - (vlib_main_t *) vlib main data structure pointer
294 @param b - (void *) buffer pointer
295 @return - (uword) length of buffer chain
298 vlib_buffer_length_in_chain (vlib_main_t * vm, vlib_buffer_t * b)
300 uword len = b->current_length;
302 if (PREDICT_TRUE ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0))
305 if (PREDICT_TRUE (b->flags & VLIB_BUFFER_TOTAL_LENGTH_VALID))
306 return len + b->total_length_not_including_first_buffer;
308 return vlib_buffer_length_in_chain_slow_path (vm, b);
311 /** \brief Get length in bytes of the buffer index buffer chain
313 @param vm - (vlib_main_t *) vlib main data structure pointer
314 @param bi - (u32) buffer index
315 @return - (uword) length of buffer chain
318 vlib_buffer_index_length_in_chain (vlib_main_t * vm, u32 bi)
320 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
321 return vlib_buffer_length_in_chain (vm, b);
324 /** \brief Copy buffer contents to memory
326 @param vm - (vlib_main_t *) vlib main data structure pointer
327 @param buffer_index - (u32) buffer index
328 @param contents - (u8 *) memory, <strong>must be large enough</strong>
329 @return - (uword) length of buffer chain
332 vlib_buffer_contents (vlib_main_t * vm, u32 buffer_index, u8 * contents)
334 uword content_len = 0;
340 b = vlib_get_buffer (vm, buffer_index);
341 l = b->current_length;
342 clib_memcpy_fast (contents + content_len, b->data + b->current_data, l);
344 if (!(b->flags & VLIB_BUFFER_NEXT_PRESENT))
346 buffer_index = b->next_buffer;
353 vlib_buffer_get_pa (vlib_main_t * vm, vlib_buffer_t * b)
355 return vlib_physmem_get_pa (vm, b->data);
359 vlib_buffer_get_current_pa (vlib_main_t * vm, vlib_buffer_t * b)
361 return vlib_buffer_get_pa (vm, b) + b->current_data;
364 /** \brief Prefetch buffer metadata by buffer index
365 The first 64 bytes of buffer contains most header information
367 @param vm - (vlib_main_t *) vlib main data structure pointer
368 @param bi - (u32) buffer index
369 @param type - LOAD, STORE. In most cases, STORE is the right answer
371 /* Prefetch buffer header given index. */
372 #define vlib_prefetch_buffer_with_index(vm,bi,type) \
374 vlib_buffer_t * _b = vlib_get_buffer (vm, bi); \
375 vlib_prefetch_buffer_header (_b, type); \
380 /* Index is unknown. */
383 /* Index is known and free/allocated. */
384 VLIB_BUFFER_KNOWN_FREE,
385 VLIB_BUFFER_KNOWN_ALLOCATED,
386 } vlib_buffer_known_state_t;
388 void vlib_buffer_validate_alloc_free (vlib_main_t * vm, u32 * buffers,
390 vlib_buffer_known_state_t
393 always_inline vlib_buffer_known_state_t
394 vlib_buffer_is_known (vlib_main_t * vm, u32 buffer_index)
396 vlib_buffer_main_t *bm = vm->buffer_main;
398 clib_spinlock_lock (&bm->buffer_known_hash_lockp);
399 uword *p = hash_get (bm->buffer_known_hash, buffer_index);
400 clib_spinlock_unlock (&bm->buffer_known_hash_lockp);
401 return p ? p[0] : VLIB_BUFFER_UNKNOWN;
404 /* Validates sanity of a single buffer.
405 Returns format'ed vector with error message if any. */
406 u8 *vlib_validate_buffer (vlib_main_t * vm, u32 buffer_index,
409 static_always_inline vlib_buffer_pool_t *
410 vlib_get_buffer_pool (vlib_main_t * vm, u8 buffer_pool_index)
412 vlib_buffer_main_t *bm = vm->buffer_main;
413 return vec_elt_at_index (bm->buffer_pools, buffer_pool_index);
416 static_always_inline uword
417 vlib_buffer_pool_get (vlib_main_t * vm, u8 buffer_pool_index, u32 * buffers,
420 vlib_buffer_pool_t *bp = vlib_get_buffer_pool (vm, buffer_pool_index);
423 ASSERT (bp->buffers);
425 clib_spinlock_lock (&bp->lock);
426 len = vec_len (bp->buffers);
427 if (PREDICT_TRUE (n_buffers < len))
430 vlib_buffer_copy_indices (buffers, bp->buffers + len, n_buffers);
431 _vec_len (bp->buffers) = len;
432 clib_spinlock_unlock (&bp->lock);
437 vlib_buffer_copy_indices (buffers, bp->buffers, len);
438 _vec_len (bp->buffers) = 0;
439 clib_spinlock_unlock (&bp->lock);
445 /** \brief Allocate buffers from specific pool into supplied array
447 @param vm - (vlib_main_t *) vlib main data structure pointer
448 @param buffers - (u32 * ) buffer index array
449 @param n_buffers - (u32) number of buffers requested
450 @return - (u32) number of buffers actually allocated, may be
451 less than the number requested or zero
455 vlib_buffer_alloc_from_pool (vlib_main_t * vm, u32 * buffers, u32 n_buffers,
456 u8 buffer_pool_index)
458 vlib_buffer_main_t *bm = vm->buffer_main;
459 vlib_buffer_pool_t *bp;
460 vlib_buffer_pool_thread_t *bpt;
461 u32 *src, *dst, len, n_left;
463 bp = vec_elt_at_index (bm->buffer_pools, buffer_pool_index);
464 bpt = vec_elt_at_index (bp->threads, vm->thread_index);
468 len = vec_len (bpt->cached_buffers);
470 /* per-thread cache contains enough buffers */
471 if (len >= n_buffers)
473 src = bpt->cached_buffers + len - n_buffers;
474 vlib_buffer_copy_indices (dst, src, n_buffers);
475 _vec_len (bpt->cached_buffers) -= n_buffers;
478 vlib_buffer_validate_alloc_free (vm, buffers, n_buffers,
479 VLIB_BUFFER_KNOWN_FREE);
483 /* take everything available in the cache */
486 vlib_buffer_copy_indices (dst, bpt->cached_buffers, len);
487 _vec_len (bpt->cached_buffers) = 0;
492 len = round_pow2 (n_left, 32);
493 vec_validate_aligned (bpt->cached_buffers, len - 1, CLIB_CACHE_LINE_BYTES);
494 len = vlib_buffer_pool_get (vm, buffer_pool_index, bpt->cached_buffers,
496 _vec_len (bpt->cached_buffers) = len;
500 u32 n_copy = clib_min (len, n_left);
501 src = bpt->cached_buffers + len - n_copy;
502 vlib_buffer_copy_indices (dst, src, n_copy);
503 _vec_len (bpt->cached_buffers) -= n_copy;
509 /* Verify that buffers are known free. */
511 vlib_buffer_validate_alloc_free (vm, buffers, n_buffers,
512 VLIB_BUFFER_KNOWN_FREE);
517 /** \brief Allocate buffers from specific numa node into supplied array
519 @param vm - (vlib_main_t *) vlib main data structure pointer
520 @param buffers - (u32 * ) buffer index array
521 @param n_buffers - (u32) number of buffers requested
522 @param numa_node - (u32) numa node
523 @return - (u32) number of buffers actually allocated, may be
524 less than the number requested or zero
527 vlib_buffer_alloc_on_numa (vlib_main_t * vm, u32 * buffers, u32 n_buffers,
530 u8 index = vlib_buffer_pool_get_default_for_numa (vm, numa_node);
531 return vlib_buffer_alloc_from_pool (vm, buffers, n_buffers, index);
534 /** \brief Allocate buffers into supplied array
536 @param vm - (vlib_main_t *) vlib main data structure pointer
537 @param buffers - (u32 * ) buffer index array
538 @param n_buffers - (u32) number of buffers requested
539 @return - (u32) number of buffers actually allocated, may be
540 less than the number requested or zero
544 vlib_buffer_alloc (vlib_main_t * vm, u32 * buffers, u32 n_buffers)
546 return vlib_buffer_alloc_on_numa (vm, buffers, n_buffers, vm->numa_node);
549 /** \brief Allocate buffers into ring
551 @param vm - (vlib_main_t *) vlib main data structure pointer
552 @param buffers - (u32 * ) buffer index ring
553 @param start - (u32) first slot in the ring
554 @param ring_size - (u32) ring size
555 @param n_buffers - (u32) number of buffers requested
556 @return - (u32) number of buffers actually allocated, may be
557 less than the number requested or zero
560 vlib_buffer_alloc_to_ring (vlib_main_t * vm, u32 * ring, u32 start,
561 u32 ring_size, u32 n_buffers)
565 ASSERT (n_buffers <= ring_size);
567 if (PREDICT_TRUE (start + n_buffers <= ring_size))
568 return vlib_buffer_alloc (vm, ring + start, n_buffers);
570 n_alloc = vlib_buffer_alloc (vm, ring + start, ring_size - start);
572 if (PREDICT_TRUE (n_alloc == ring_size - start))
573 n_alloc += vlib_buffer_alloc (vm, ring, n_buffers - n_alloc);
578 /** \brief Allocate buffers into ring from specific buffer pool
580 @param vm - (vlib_main_t *) vlib main data structure pointer
581 @param buffers - (u32 * ) buffer index ring
582 @param start - (u32) first slot in the ring
583 @param ring_size - (u32) ring size
584 @param n_buffers - (u32) number of buffers requested
585 @return - (u32) number of buffers actually allocated, may be
586 less than the number requested or zero
589 vlib_buffer_alloc_to_ring_from_pool (vlib_main_t * vm, u32 * ring, u32 start,
590 u32 ring_size, u32 n_buffers,
591 u8 buffer_pool_index)
595 ASSERT (n_buffers <= ring_size);
597 if (PREDICT_TRUE (start + n_buffers <= ring_size))
598 return vlib_buffer_alloc_from_pool (vm, ring + start, n_buffers,
601 n_alloc = vlib_buffer_alloc_from_pool (vm, ring + start, ring_size - start,
604 if (PREDICT_TRUE (n_alloc == ring_size - start))
605 n_alloc += vlib_buffer_alloc_from_pool (vm, ring, n_buffers - n_alloc,
612 vlib_buffer_pool_put (vlib_main_t * vm, u8 buffer_pool_index,
613 u32 * buffers, u32 n_buffers)
615 vlib_buffer_pool_t *bp = vlib_get_buffer_pool (vm, buffer_pool_index);
616 vlib_buffer_pool_thread_t *bpt =
617 vec_elt_at_index (bp->threads, vm->thread_index);
619 vec_add_aligned (bpt->cached_buffers, buffers, n_buffers,
620 CLIB_CACHE_LINE_BYTES);
622 if (vec_len (bpt->cached_buffers) > 4 * VLIB_FRAME_SIZE)
624 clib_spinlock_lock (&bp->lock);
625 /* keep last stored buffers, as they are more likely hot in the cache */
626 vec_add_aligned (bp->buffers, bpt->cached_buffers, VLIB_FRAME_SIZE,
627 CLIB_CACHE_LINE_BYTES);
628 vec_delete (bpt->cached_buffers, VLIB_FRAME_SIZE, 0);
629 bpt->n_alloc -= VLIB_FRAME_SIZE;
630 clib_spinlock_unlock (&bp->lock);
634 static_always_inline void
635 vlib_buffer_free_inline (vlib_main_t * vm, u32 * buffers, u32 n_buffers,
638 const int queue_size = 128;
639 vlib_buffer_pool_t *bp = 0;
640 u8 buffer_pool_index = ~0;
641 u32 n_queue = 0, queue[queue_size + 4];
642 vlib_buffer_t bt = { };
643 #if defined(CLIB_HAVE_VEC128) && !__aarch64__
644 vlib_buffer_t bpi_mask = {.buffer_pool_index = ~0 };
645 vlib_buffer_t bpi_vec = {.buffer_pool_index = ~0 };
646 vlib_buffer_t flags_refs_mask = {
647 .flags = VLIB_BUFFER_NEXT_PRESENT,
655 u32 bi, sum = 0, flags, next;
660 vlib_get_buffers (vm, buffers, b, 4);
661 vlib_get_buffers (vm, buffers + 8, b + 4, 4);
663 vlib_prefetch_buffer_header (b[4], LOAD);
664 vlib_prefetch_buffer_header (b[5], LOAD);
665 vlib_prefetch_buffer_header (b[6], LOAD);
666 vlib_prefetch_buffer_header (b[7], LOAD);
668 #if defined(CLIB_HAVE_VEC128) && !__aarch64__
669 u8x16 p0, p1, p2, p3, r;
670 p0 = u8x16_load_unaligned (b[0]);
671 p1 = u8x16_load_unaligned (b[1]);
672 p2 = u8x16_load_unaligned (b[2]);
673 p3 = u8x16_load_unaligned (b[3]);
675 r = p0 ^ bpi_vec.as_u8x16[0];
676 r |= p1 ^ bpi_vec.as_u8x16[0];
677 r |= p2 ^ bpi_vec.as_u8x16[0];
678 r |= p3 ^ bpi_vec.as_u8x16[0];
679 r &= bpi_mask.as_u8x16[0];
680 r |= (p0 | p1 | p2 | p3) & flags_refs_mask.as_u8x16[0];
682 sum = !u8x16_is_all_zero (r);
688 sum &= VLIB_BUFFER_NEXT_PRESENT;
689 sum += b[0]->ref_count - 1;
690 sum += b[1]->ref_count - 1;
691 sum += b[2]->ref_count - 1;
692 sum += b[3]->ref_count - 1;
693 sum |= b[0]->buffer_pool_index ^ buffer_pool_index;
694 sum |= b[1]->buffer_pool_index ^ buffer_pool_index;
695 sum |= b[2]->buffer_pool_index ^ buffer_pool_index;
696 sum |= b[3]->buffer_pool_index ^ buffer_pool_index;
702 vlib_buffer_copy_indices (queue + n_queue, buffers, 4);
703 vlib_buffer_copy_template (b[0], &bt);
704 vlib_buffer_copy_template (b[1], &bt);
705 vlib_buffer_copy_template (b[2], &bt);
706 vlib_buffer_copy_template (b[3], &bt);
710 vlib_buffer_validate_alloc_free (vm, buffers, 4,
711 VLIB_BUFFER_KNOWN_ALLOCATED);
713 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[0]);
714 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[1]);
715 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[2]);
716 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[3]);
718 if (n_queue >= queue_size)
720 vlib_buffer_pool_put (vm, buffer_pool_index, queue, n_queue);
731 b[0] = vlib_get_buffer (vm, bi);
733 next = b[0]->next_buffer;
735 if (PREDICT_FALSE (buffer_pool_index != b[0]->buffer_pool_index))
737 buffer_pool_index = b[0]->buffer_pool_index;
738 #if defined(CLIB_HAVE_VEC128) && !__aarch64__
739 bpi_vec.buffer_pool_index = buffer_pool_index;
741 bp = vlib_get_buffer_pool (vm, buffer_pool_index);
742 vlib_buffer_copy_template (&bt, &bp->buffer_template);
746 vlib_buffer_pool_put (vm, buffer_pool_index, queue, n_queue);
751 ASSERT (pointer_to_uword (b[0]) >= bp->start &&
752 pointer_to_uword (b[0]) <
753 bp->start + bp->size - (bp->data_size + sizeof (*b[0])));
755 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[0]);
757 if (clib_atomic_sub_fetch (&b[0]->ref_count, 1) == 0)
760 vlib_buffer_validate_alloc_free (vm, &bi, 1,
761 VLIB_BUFFER_KNOWN_ALLOCATED);
762 vlib_buffer_copy_template (b[0], &bt);
763 queue[n_queue++] = bi;
766 if (n_queue == queue_size)
768 vlib_buffer_pool_put (vm, buffer_pool_index, queue, queue_size);
772 if (flags & VLIB_BUFFER_NEXT_PRESENT)
783 vlib_buffer_pool_put (vm, buffer_pool_index, queue, n_queue);
787 /** \brief Free buffers
788 Frees the entire buffer chain for each buffer
790 @param vm - (vlib_main_t *) vlib main data structure pointer
791 @param buffers - (u32 * ) buffer index array
792 @param n_buffers - (u32) number of buffers to free
796 vlib_buffer_free (vlib_main_t * vm,
797 /* pointer to first buffer */
799 /* number of buffers to free */
802 vlib_buffer_free_inline (vm, buffers, n_buffers, /* maybe next */ 1);
805 /** \brief Free buffers, does not free the buffer chain for each buffer
807 @param vm - (vlib_main_t *) vlib main data structure pointer
808 @param buffers - (u32 * ) buffer index array
809 @param n_buffers - (u32) number of buffers to free
813 vlib_buffer_free_no_next (vlib_main_t * vm,
814 /* pointer to first buffer */
816 /* number of buffers to free */
819 vlib_buffer_free_inline (vm, buffers, n_buffers, /* maybe next */ 0);
822 /** \brief Free one buffer
823 Shorthand to free a single buffer chain.
825 @param vm - (vlib_main_t *) vlib main data structure pointer
826 @param buffer_index - (u32) buffer index to free
829 vlib_buffer_free_one (vlib_main_t * vm, u32 buffer_index)
831 vlib_buffer_free_inline (vm, &buffer_index, 1, /* maybe next */ 1);
834 /** \brief Free buffers from ring
836 @param vm - (vlib_main_t *) vlib main data structure pointer
837 @param buffers - (u32 * ) buffer index ring
838 @param start - (u32) first slot in the ring
839 @param ring_size - (u32) ring size
840 @param n_buffers - (u32) number of buffers
843 vlib_buffer_free_from_ring (vlib_main_t * vm, u32 * ring, u32 start,
844 u32 ring_size, u32 n_buffers)
846 ASSERT (n_buffers <= ring_size);
848 if (PREDICT_TRUE (start + n_buffers <= ring_size))
850 vlib_buffer_free (vm, ring + start, n_buffers);
854 vlib_buffer_free (vm, ring + start, ring_size - start);
855 vlib_buffer_free (vm, ring, n_buffers - (ring_size - start));
859 /** \brief Free buffers from ring without freeing tail buffers
861 @param vm - (vlib_main_t *) vlib main data structure pointer
862 @param buffers - (u32 * ) buffer index ring
863 @param start - (u32) first slot in the ring
864 @param ring_size - (u32) ring size
865 @param n_buffers - (u32) number of buffers
868 vlib_buffer_free_from_ring_no_next (vlib_main_t * vm, u32 * ring, u32 start,
869 u32 ring_size, u32 n_buffers)
871 ASSERT (n_buffers <= ring_size);
873 if (PREDICT_TRUE (start + n_buffers <= ring_size))
875 vlib_buffer_free_no_next (vm, ring + start, n_buffers);
879 vlib_buffer_free_no_next (vm, ring + start, ring_size - start);
880 vlib_buffer_free_no_next (vm, ring, n_buffers - (ring_size - start));
884 /* Append given data to end of buffer, possibly allocating new buffers. */
885 int vlib_buffer_add_data (vlib_main_t * vm, u32 * buffer_index, void *data,
888 /* duplicate all buffers in chain */
889 always_inline vlib_buffer_t *
890 vlib_buffer_copy (vlib_main_t * vm, vlib_buffer_t * b)
892 vlib_buffer_t *s, *d, *fd;
893 uword n_alloc, n_buffers = 1;
894 u32 flag_mask = VLIB_BUFFER_NEXT_PRESENT | VLIB_BUFFER_TOTAL_LENGTH_VALID;
898 while (s->flags & VLIB_BUFFER_NEXT_PRESENT)
901 s = vlib_get_buffer (vm, s->next_buffer);
903 u32 new_buffers[n_buffers];
905 n_alloc = vlib_buffer_alloc (vm, new_buffers, n_buffers);
907 /* No guarantee that we'll get all the buffers we asked for */
908 if (PREDICT_FALSE (n_alloc < n_buffers))
911 vlib_buffer_free (vm, new_buffers, n_alloc);
917 fd = d = vlib_get_buffer (vm, new_buffers[0]);
918 d->current_data = s->current_data;
919 d->current_length = s->current_length;
920 d->flags = s->flags & flag_mask;
921 d->total_length_not_including_first_buffer =
922 s->total_length_not_including_first_buffer;
923 clib_memcpy_fast (d->opaque, s->opaque, sizeof (s->opaque));
924 clib_memcpy_fast (d->opaque2, s->opaque2, sizeof (s->opaque2));
925 clib_memcpy_fast (vlib_buffer_get_current (d),
926 vlib_buffer_get_current (s), s->current_length);
929 for (i = 1; i < n_buffers; i++)
932 d->next_buffer = new_buffers[i];
934 s = vlib_get_buffer (vm, s->next_buffer);
935 d = vlib_get_buffer (vm, new_buffers[i]);
936 d->current_data = s->current_data;
937 d->current_length = s->current_length;
938 clib_memcpy_fast (vlib_buffer_get_current (d),
939 vlib_buffer_get_current (s), s->current_length);
940 d->flags = s->flags & flag_mask;
946 /** \brief Create a maximum of 256 clones of buffer and store them
947 in the supplied array
949 @param vm - (vlib_main_t *) vlib main data structure pointer
950 @param src_buffer - (u32) source buffer index
951 @param buffers - (u32 * ) buffer index array
952 @param n_buffers - (u16) number of buffer clones requested (<=256)
953 @param head_end_offset - (u16) offset relative to current position
954 where packet head ends
955 @return - (u16) number of buffers actually cloned, may be
956 less than the number requested or zero
959 vlib_buffer_clone_256 (vlib_main_t * vm, u32 src_buffer, u32 * buffers,
960 u16 n_buffers, u16 head_end_offset)
963 vlib_buffer_t *s = vlib_get_buffer (vm, src_buffer);
965 ASSERT (s->ref_count == 1);
967 ASSERT (n_buffers <= 256);
969 if (s->current_length <= head_end_offset + CLIB_CACHE_LINE_BYTES * 2)
971 buffers[0] = src_buffer;
972 for (i = 1; i < n_buffers; i++)
975 d = vlib_buffer_copy (vm, s);
978 buffers[i] = vlib_get_buffer_index (vm, d);
984 if (PREDICT_FALSE (n_buffers == 1))
986 buffers[0] = src_buffer;
990 n_buffers = vlib_buffer_alloc_from_pool (vm, buffers, n_buffers,
991 s->buffer_pool_index);
993 for (i = 0; i < n_buffers; i++)
995 vlib_buffer_t *d = vlib_get_buffer (vm, buffers[i]);
996 d->current_data = s->current_data;
997 d->current_length = head_end_offset;
998 ASSERT (d->buffer_pool_index == s->buffer_pool_index);
1000 d->total_length_not_including_first_buffer = s->current_length -
1002 if (PREDICT_FALSE (s->flags & VLIB_BUFFER_NEXT_PRESENT))
1004 d->total_length_not_including_first_buffer +=
1005 s->total_length_not_including_first_buffer;
1007 d->flags = s->flags | VLIB_BUFFER_NEXT_PRESENT;
1008 d->flags &= ~VLIB_BUFFER_EXT_HDR_VALID;
1009 clib_memcpy_fast (d->opaque, s->opaque, sizeof (s->opaque));
1010 clib_memcpy_fast (d->opaque2, s->opaque2, sizeof (s->opaque2));
1011 clib_memcpy_fast (vlib_buffer_get_current (d),
1012 vlib_buffer_get_current (s), head_end_offset);
1013 d->next_buffer = src_buffer;
1015 vlib_buffer_advance (s, head_end_offset);
1016 s->ref_count = n_buffers;
1017 while (s->flags & VLIB_BUFFER_NEXT_PRESENT)
1019 s = vlib_get_buffer (vm, s->next_buffer);
1020 s->ref_count = n_buffers;
1026 /** \brief Create multiple clones of buffer and store them
1027 in the supplied array
1029 @param vm - (vlib_main_t *) vlib main data structure pointer
1030 @param src_buffer - (u32) source buffer index
1031 @param buffers - (u32 * ) buffer index array
1032 @param n_buffers - (u16) number of buffer clones requested (<=256)
1033 @param head_end_offset - (u16) offset relative to current position
1034 where packet head ends
1035 @return - (u16) number of buffers actually cloned, may be
1036 less than the number requested or zero
1039 vlib_buffer_clone (vlib_main_t * vm, u32 src_buffer, u32 * buffers,
1040 u16 n_buffers, u16 head_end_offset)
1042 vlib_buffer_t *s = vlib_get_buffer (vm, src_buffer);
1045 while (n_buffers > 256)
1047 vlib_buffer_t *copy;
1048 copy = vlib_buffer_copy (vm, s);
1049 n_cloned += vlib_buffer_clone_256 (vm,
1050 vlib_get_buffer_index (vm, copy),
1051 (buffers + n_cloned),
1052 256, head_end_offset);
1055 n_cloned += vlib_buffer_clone_256 (vm, src_buffer,
1057 n_buffers, head_end_offset);
1062 /** \brief Attach cloned tail to the buffer
1064 @param vm - (vlib_main_t *) vlib main data structure pointer
1065 @param head - (vlib_buffer_t *) head buffer
1066 @param tail - (Vlib buffer_t *) tail buffer to clone and attach to head
1070 vlib_buffer_attach_clone (vlib_main_t * vm, vlib_buffer_t * head,
1071 vlib_buffer_t * tail)
1073 ASSERT ((head->flags & VLIB_BUFFER_NEXT_PRESENT) == 0);
1074 ASSERT (head->buffer_pool_index == tail->buffer_pool_index);
1076 head->flags |= VLIB_BUFFER_NEXT_PRESENT;
1077 head->flags &= ~VLIB_BUFFER_TOTAL_LENGTH_VALID;
1078 head->flags &= ~VLIB_BUFFER_EXT_HDR_VALID;
1079 head->flags |= (tail->flags & VLIB_BUFFER_TOTAL_LENGTH_VALID);
1080 head->next_buffer = vlib_get_buffer_index (vm, tail);
1081 head->total_length_not_including_first_buffer = tail->current_length +
1082 tail->total_length_not_including_first_buffer;
1085 clib_atomic_add_fetch (&tail->ref_count, 1);
1087 if (tail->flags & VLIB_BUFFER_NEXT_PRESENT)
1089 tail = vlib_get_buffer (vm, tail->next_buffer);
1094 /* Initializes the buffer as an empty packet with no chained buffers. */
1096 vlib_buffer_chain_init (vlib_buffer_t * first)
1098 first->total_length_not_including_first_buffer = 0;
1099 first->current_length = 0;
1100 first->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
1101 first->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
1104 /* The provided next_bi buffer index is appended to the end of the packet. */
1105 always_inline vlib_buffer_t *
1106 vlib_buffer_chain_buffer (vlib_main_t * vm, vlib_buffer_t * last, u32 next_bi)
1108 vlib_buffer_t *next_buffer = vlib_get_buffer (vm, next_bi);
1109 last->next_buffer = next_bi;
1110 last->flags |= VLIB_BUFFER_NEXT_PRESENT;
1111 next_buffer->current_length = 0;
1112 next_buffer->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
1116 /* Increases or decreases the packet length.
1117 * It does not allocate or deallocate new buffers.
1118 * Therefore, the added length must be compatible
1119 * with the last buffer. */
1121 vlib_buffer_chain_increase_length (vlib_buffer_t * first,
1122 vlib_buffer_t * last, i32 len)
1124 last->current_length += len;
1126 first->total_length_not_including_first_buffer += len;
1129 /* Copy data to the end of the packet and increases its length.
1130 * It does not allocate new buffers.
1131 * Returns the number of copied bytes. */
1133 vlib_buffer_chain_append_data (vlib_main_t * vm,
1134 vlib_buffer_t * first,
1135 vlib_buffer_t * last, void *data, u16 data_len)
1137 u32 n_buffer_bytes = VLIB_BUFFER_DATA_SIZE;
1138 ASSERT (n_buffer_bytes >= last->current_length + last->current_data);
1139 u16 len = clib_min (data_len,
1140 n_buffer_bytes - last->current_length -
1141 last->current_data);
1142 clib_memcpy_fast (vlib_buffer_get_current (last) + last->current_length,
1144 vlib_buffer_chain_increase_length (first, last, len);
1148 /* Copy data to the end of the packet and increases its length.
1149 * Allocates additional buffers from the free list if necessary.
1150 * Returns the number of copied bytes.
1151 * 'last' value is modified whenever new buffers are allocated and
1152 * chained and points to the last buffer in the chain. */
1154 vlib_buffer_chain_append_data_with_alloc (vlib_main_t * vm,
1155 vlib_buffer_t * first,
1156 vlib_buffer_t ** last, void *data,
1158 void vlib_buffer_chain_validate (vlib_main_t * vm, vlib_buffer_t * first);
1160 format_function_t format_vlib_buffer, format_vlib_buffer_and_data,
1161 format_vlib_buffer_contents;
1165 /* Vector of packet data. */
1168 /* Number of buffers to allocate in each call to allocator. */
1169 u32 min_n_buffers_each_alloc;
1172 } vlib_packet_template_t;
1174 void vlib_packet_template_init (vlib_main_t * vm,
1175 vlib_packet_template_t * t,
1177 uword n_packet_data_bytes,
1178 uword min_n_buffers_each_alloc,
1181 void *vlib_packet_template_get_packet (vlib_main_t * vm,
1182 vlib_packet_template_t * t,
1186 vlib_packet_template_free (vlib_main_t * vm, vlib_packet_template_t * t)
1188 vec_free (t->packet_data);
1192 * @brief compress buffer chain in a way where the first buffer is at least
1193 * VLIB_BUFFER_CLONE_HEAD_SIZE long
1195 * @param[in] vm - vlib_main
1196 * @param[in,out] first - first buffer in chain
1197 * @param[in,out] discard_vector - vector of buffer indexes which were removed
1201 vlib_buffer_chain_compress (vlib_main_t * vm,
1202 vlib_buffer_t * first, u32 ** discard_vector)
1204 if (first->current_length >= VLIB_BUFFER_CLONE_HEAD_SIZE ||
1205 !(first->flags & VLIB_BUFFER_NEXT_PRESENT))
1207 /* this is already big enough or not a chain */
1211 u32 want_first_size = clib_min (VLIB_BUFFER_CLONE_HEAD_SIZE,
1212 VLIB_BUFFER_DATA_SIZE -
1213 first->current_data);
1216 vlib_buffer_t *second = vlib_get_buffer (vm, first->next_buffer);
1217 u32 need = want_first_size - first->current_length;
1218 u32 amount_to_copy = clib_min (need, second->current_length);
1219 clib_memcpy_fast (((u8 *) vlib_buffer_get_current (first)) +
1220 first->current_length,
1221 vlib_buffer_get_current (second), amount_to_copy);
1222 first->current_length += amount_to_copy;
1223 second->current_data += amount_to_copy;
1224 second->current_length -= amount_to_copy;
1225 if (first->flags & VLIB_BUFFER_TOTAL_LENGTH_VALID)
1227 first->total_length_not_including_first_buffer -= amount_to_copy;
1229 if (!second->current_length)
1231 vec_add1 (*discard_vector, first->next_buffer);
1232 if (second->flags & VLIB_BUFFER_NEXT_PRESENT)
1234 first->next_buffer = second->next_buffer;
1238 first->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
1240 second->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
1243 while ((first->current_length < want_first_size) &&
1244 (first->flags & VLIB_BUFFER_NEXT_PRESENT));
1248 * @brief linearize buffer chain - the first buffer is filled, if needed,
1249 * buffers are allocated and filled, returns free space in last buffer or
1250 * negative on failure
1252 * @param[in] vm - vlib_main
1253 * @param[in,out] first - first buffer in chain
1256 vlib_buffer_chain_linearize (vlib_main_t * vm, vlib_buffer_t * first)
1258 vlib_buffer_t *b = first;
1259 u32 buf_len = VLIB_BUFFER_DATA_SIZE;
1260 // free buffer chain starting from the second buffer
1261 int free_count = (b->flags & VLIB_BUFFER_NEXT_PRESENT) != 0;
1262 u32 chain_to_free = b->next_buffer;
1264 u32 len = vlib_buffer_length_in_chain (vm, b);
1265 u32 free_len = buf_len - b->current_data - b->current_length;
1266 int alloc_len = clib_max (len - free_len, 0); //use the free len in the first buffer
1267 int n_buffers = (alloc_len + buf_len - 1) / buf_len;
1268 u32 new_buffers[n_buffers];
1270 u32 n_alloc = vlib_buffer_alloc (vm, new_buffers, n_buffers);
1271 if (n_alloc != n_buffers)
1273 vlib_buffer_free_no_next (vm, new_buffers, n_alloc);
1277 vlib_buffer_t *s = b;
1278 while (s->flags & VLIB_BUFFER_NEXT_PRESENT)
1280 s = vlib_get_buffer (vm, s->next_buffer);
1281 int d_free_len = buf_len - b->current_data - b->current_length;
1282 ASSERT (d_free_len >= 0);
1283 // chain buf and split write
1284 u32 copy_len = clib_min (d_free_len, s->current_length);
1285 u8 *d = vlib_buffer_put_uninit (b, copy_len);
1286 clib_memcpy (d, vlib_buffer_get_current (s), copy_len);
1287 int rest = s->current_length - copy_len;
1291 ASSERT (vlib_buffer_get_tail (b) == b->data + buf_len);
1292 ASSERT (n_buffers > 0);
1293 b = vlib_buffer_chain_buffer (vm, b, new_buffers[--n_buffers]);
1294 //make full use of the new buffers
1295 b->current_data = 0;
1296 d = vlib_buffer_put_uninit (b, rest);
1297 clib_memcpy (d, vlib_buffer_get_current (s) + copy_len, rest);
1300 vlib_buffer_free (vm, &chain_to_free, free_count);
1301 b->flags &= ~VLIB_BUFFER_TOTAL_LENGTH_VALID;
1302 if (b == first) /* no buffers addeed */
1303 b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
1304 ASSERT (len == vlib_buffer_length_in_chain (vm, first));
1305 ASSERT (n_buffers == 0);
1306 return buf_len - b->current_data - b->current_length;
1309 #endif /* included_vlib_buffer_funcs_h */
1312 * fd.io coding-style-patch-verification: ON
1315 * eval: (c-set-style "gnu")