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.c: allocate/free network buffers.
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.
44 * Allocate/free network buffers with DPDK.
47 #include <rte_config.h>
49 #include <rte_common.h>
51 #include <rte_memory.h>
52 #include <rte_memzone.h>
53 #include <rte_tailq.h>
55 #include <rte_per_lcore.h>
56 #include <rte_launch.h>
57 #include <rte_atomic.h>
58 #include <rte_cycles.h>
59 #include <rte_prefetch.h>
60 #include <rte_lcore.h>
61 #include <rte_per_lcore.h>
62 #include <rte_branch_prediction.h>
63 #include <rte_interrupts.h>
65 #include <rte_random.h>
66 #include <rte_debug.h>
67 #include <rte_ether.h>
68 #include <rte_ethdev.h>
70 #include <rte_mempool.h>
72 #include <rte_version.h>
74 #include <vlib/vlib.h>
76 #pragma weak rte_mem_virt2phy
77 #pragma weak rte_eal_has_hugepages
78 #pragma weak rte_socket_id
79 #pragma weak rte_pktmbuf_pool_create
82 vlib_buffer_length_in_chain_slow_path (vlib_main_t * vm,
83 vlib_buffer_t * b_first)
85 vlib_buffer_t *b = b_first;
86 uword l_first = b_first->current_length;
88 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
90 b = vlib_get_buffer (vm, b->next_buffer);
91 l += b->current_length;
93 b_first->total_length_not_including_first_buffer = l;
94 b_first->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
99 format_vlib_buffer (u8 * s, va_list * args)
101 vlib_buffer_t *b = va_arg (*args, vlib_buffer_t *);
102 uword indent = format_get_indent (s);
104 s = format (s, "current data %d, length %d, free-list %d",
105 b->current_data, b->current_length, b->free_list_index);
107 if (b->flags & VLIB_BUFFER_TOTAL_LENGTH_VALID)
108 s = format (s, ", totlen-nifb %d",
109 b->total_length_not_including_first_buffer);
111 if (b->flags & VLIB_BUFFER_IS_TRACED)
112 s = format (s, ", trace 0x%x", b->trace_index);
114 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
116 vlib_main_t *vm = vlib_get_main ();
117 u32 next_buffer = b->next_buffer;
118 b = vlib_get_buffer (vm, next_buffer);
120 s = format (s, "\n%Unext-buffer 0x%x, segment length %d",
121 format_white_space, indent, next_buffer, b->current_length);
129 format_vlib_buffer_and_data (u8 * s, va_list * args)
131 vlib_buffer_t *b = va_arg (*args, vlib_buffer_t *);
133 s = format (s, "%U, %U",
134 format_vlib_buffer, b,
135 format_hex_bytes, vlib_buffer_get_current (b), 64);
141 format_vlib_buffer_contents (u8 * s, va_list * va)
143 vlib_main_t *vm = va_arg (*va, vlib_main_t *);
144 vlib_buffer_t *b = va_arg (*va, vlib_buffer_t *);
148 vec_add (s, vlib_buffer_get_current (b), b->current_length);
149 if (!(b->flags & VLIB_BUFFER_NEXT_PRESENT))
151 b = vlib_get_buffer (vm, b->next_buffer);
157 vlib_main_t **vlib_mains;
159 /* Aligned copy routine. */
161 vlib_aligned_memcpy (void *_dst, void *_src, int n_bytes)
163 vlib_copy_unit_t *dst = _dst;
164 vlib_copy_unit_t *src = _src;
166 /* Arguments must be naturally aligned. */
167 ASSERT (pointer_to_uword (dst) % sizeof (dst[0]) == 0);
168 ASSERT (pointer_to_uword (src) % sizeof (src[0]) == 0);
169 ASSERT (n_bytes % sizeof (dst[0]) == 0);
171 if (4 * sizeof (dst[0]) == CLIB_CACHE_LINE_BYTES)
173 CLIB_PREFETCH (dst + 0, 4 * sizeof (dst[0]), WRITE);
174 CLIB_PREFETCH (src + 0, 4 * sizeof (src[0]), READ);
176 while (n_bytes >= 4 * sizeof (dst[0]))
180 n_bytes -= 4 * sizeof (dst[0]);
181 CLIB_PREFETCH (dst, 4 * sizeof (dst[0]), WRITE);
182 CLIB_PREFETCH (src, 4 * sizeof (src[0]), READ);
189 else if (8 * sizeof (dst[0]) == CLIB_CACHE_LINE_BYTES)
191 CLIB_PREFETCH (dst + 0, 8 * sizeof (dst[0]), WRITE);
192 CLIB_PREFETCH (src + 0, 8 * sizeof (src[0]), READ);
194 while (n_bytes >= 8 * sizeof (dst[0]))
198 n_bytes -= 8 * sizeof (dst[0]);
199 CLIB_PREFETCH (dst, 8 * sizeof (dst[0]), WRITE);
200 CLIB_PREFETCH (src, 8 * sizeof (src[0]), READ);
212 /* Cache line size unknown: fall back to slow version. */ ;
217 n_bytes -= 1 * sizeof (dst[0]);
221 #define BUFFERS_PER_COPY (sizeof (vlib_copy_unit_t) / sizeof (u32))
223 /* Make sure we have at least given number of unaligned buffers. */
225 fill_unaligned (vlib_main_t * vm,
226 vlib_buffer_free_list_t * free_list,
227 uword n_unaligned_buffers)
229 word la = vec_len (free_list->aligned_buffers);
230 word lu = vec_len (free_list->unaligned_buffers);
232 /* Aligned come in aligned copy-sized chunks. */
233 ASSERT (la % BUFFERS_PER_COPY == 0);
235 ASSERT (la >= n_unaligned_buffers);
237 while (lu < n_unaligned_buffers)
239 /* Copy 4 buffers from end of aligned vector to unaligned vector. */
240 vec_add (free_list->unaligned_buffers,
241 free_list->aligned_buffers + la - BUFFERS_PER_COPY,
243 la -= BUFFERS_PER_COPY;
244 lu += BUFFERS_PER_COPY;
246 _vec_len (free_list->aligned_buffers) = la;
249 /* After free aligned buffers may not contain even sized chunks. */
251 trim_aligned (vlib_buffer_free_list_t * f)
255 /* Add unaligned to aligned before trim. */
256 l = vec_len (f->unaligned_buffers);
259 vec_add_aligned (f->aligned_buffers, f->unaligned_buffers, l,
260 /* align */ sizeof (vlib_copy_unit_t));
262 _vec_len (f->unaligned_buffers) = 0;
265 /* Remove unaligned buffers from end of aligned vector and save for next trim. */
266 l = vec_len (f->aligned_buffers);
267 n_trim = l % BUFFERS_PER_COPY;
270 /* Trim aligned -> unaligned. */
271 vec_add (f->unaligned_buffers, f->aligned_buffers + l - n_trim, n_trim);
273 /* Remove from aligned. */
274 _vec_len (f->aligned_buffers) = l - n_trim;
279 merge_free_lists (vlib_buffer_free_list_t * dst,
280 vlib_buffer_free_list_t * src)
288 l = vec_len (src->aligned_buffers);
291 vec_add2_aligned (dst->aligned_buffers, d, l,
292 /* align */ sizeof (vlib_copy_unit_t));
293 vlib_aligned_memcpy (d, src->aligned_buffers, l * sizeof (d[0]));
294 vec_free (src->aligned_buffers);
297 l = vec_len (src->unaligned_buffers);
300 vec_add (dst->unaligned_buffers, src->unaligned_buffers, l);
301 vec_free (src->unaligned_buffers);
306 vlib_buffer_get_free_list_with_size (vlib_main_t * vm, u32 size)
308 vlib_buffer_main_t *bm = vm->buffer_main;
310 size = vlib_buffer_round_size (size);
311 uword *p = hash_get (bm->free_list_by_size, size);
312 return p ? p[0] : ~0;
315 /* Add buffer free list. */
317 vlib_buffer_create_free_list_helper (vlib_main_t * vm,
319 u32 is_public, u32 is_default, u8 * name)
321 vlib_buffer_main_t *bm = vm->buffer_main;
322 vlib_buffer_free_list_t *f;
325 ASSERT (os_get_cpu_number () == 0);
327 if (!is_default && pool_elts (bm->buffer_free_list_pool) == 0)
329 u32 default_free_free_list_index;
332 default_free_free_list_index =
333 vlib_buffer_create_free_list_helper
335 /* default buffer size */ VLIB_BUFFER_DEFAULT_FREE_LIST_BYTES,
340 ASSERT (default_free_free_list_index ==
341 VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX);
343 if (n_data_bytes == VLIB_BUFFER_DEFAULT_FREE_LIST_BYTES && is_public)
344 return default_free_free_list_index;
347 pool_get_aligned (bm->buffer_free_list_pool, f, CLIB_CACHE_LINE_BYTES);
349 memset (f, 0, sizeof (f[0]));
350 f->index = f - bm->buffer_free_list_pool;
351 f->n_data_bytes = vlib_buffer_round_size (n_data_bytes);
352 f->min_n_buffers_each_physmem_alloc = 16;
353 f->name = clib_mem_is_heap_object (name) ? name : format (0, "%s", name);
355 /* Setup free buffer template. */
356 f->buffer_init_template.free_list_index = f->index;
360 uword *p = hash_get (bm->free_list_by_size, f->n_data_bytes);
362 hash_set (bm->free_list_by_size, f->n_data_bytes, f->index);
365 for (i = 1; i < vec_len (vlib_mains); i++)
367 vlib_buffer_main_t *wbm = vlib_mains[i]->buffer_main;
368 vlib_buffer_free_list_t *wf;
369 pool_get_aligned (wbm->buffer_free_list_pool,
370 wf, CLIB_CACHE_LINE_BYTES);
371 ASSERT (f - bm->buffer_free_list_pool ==
372 wf - wbm->buffer_free_list_pool);
374 wf->aligned_buffers = 0;
375 wf->unaligned_buffers = 0;
383 vlib_buffer_create_free_list (vlib_main_t * vm, u32 n_data_bytes,
390 name = va_format (0, fmt, &va);
393 return vlib_buffer_create_free_list_helper (vm, n_data_bytes,
400 vlib_buffer_get_or_create_free_list (vlib_main_t * vm, u32 n_data_bytes,
403 u32 i = vlib_buffer_get_free_list_with_size (vm, n_data_bytes);
411 name = va_format (0, fmt, &va);
414 i = vlib_buffer_create_free_list_helper (vm, n_data_bytes,
424 del_free_list (vlib_main_t * vm, vlib_buffer_free_list_t * f)
430 for (i = 0; i < vec_len (f->unaligned_buffers); i++)
432 b = vlib_get_buffer (vm, f->unaligned_buffers[i]);
433 mb = rte_mbuf_from_vlib_buffer (b);
434 ASSERT (rte_mbuf_refcnt_read (mb) == 1);
435 rte_pktmbuf_free (mb);
437 for (i = 0; i < vec_len (f->aligned_buffers); i++)
439 b = vlib_get_buffer (vm, f->aligned_buffers[i]);
440 mb = rte_mbuf_from_vlib_buffer (b);
441 ASSERT (rte_mbuf_refcnt_read (mb) == 1);
442 rte_pktmbuf_free (mb);
445 vec_free (f->unaligned_buffers);
446 vec_free (f->aligned_buffers);
449 /* Add buffer free list. */
451 vlib_buffer_delete_free_list (vlib_main_t * vm, u32 free_list_index)
453 vlib_buffer_main_t *bm = vm->buffer_main;
454 vlib_buffer_free_list_t *f;
458 ASSERT (os_get_cpu_number () == 0);
460 f = vlib_buffer_get_free_list (vm, free_list_index);
462 merge_index = vlib_buffer_get_free_list_with_size (vm, f->n_data_bytes);
463 if (merge_index != ~0 && merge_index != free_list_index)
465 merge_free_lists (pool_elt_at_index (bm->buffer_free_list_pool,
469 del_free_list (vm, f);
472 memset (f, 0xab, sizeof (f[0]));
474 pool_put (bm->buffer_free_list_pool, f);
476 for (i = 1; i < vec_len (vlib_mains); i++)
478 bm = vlib_mains[i]->buffer_main;
479 f = vlib_buffer_get_free_list (vlib_mains[i], free_list_index);;
480 memset (f, 0xab, sizeof (f[0]));
481 pool_put (bm->buffer_free_list_pool, f);
486 /* Make sure free list has at least given number of free buffers. */
488 fill_free_list (vlib_main_t * vm,
489 vlib_buffer_free_list_t * fl, uword min_free_buffers)
494 u32 n_remaining = 0, n_alloc = 0;
495 unsigned socket_id = rte_socket_id ? rte_socket_id () : 0;
496 struct rte_mempool *rmp = vm->buffer_main->pktmbuf_pools[socket_id];
500 if (PREDICT_FALSE (rmp == 0))
505 /* Already have enough free buffers on free list? */
506 n = min_free_buffers - vec_len (fl->aligned_buffers);
508 return min_free_buffers;
510 /* Always allocate round number of buffers. */
511 n = round_pow2 (n, BUFFERS_PER_COPY);
513 /* Always allocate new buffers in reasonably large sized chunks. */
514 n = clib_max (n, fl->min_n_buffers_each_physmem_alloc);
516 vec_validate (vm->mbuf_alloc_list, n - 1);
518 if (rte_mempool_get_bulk (rmp, vm->mbuf_alloc_list, n) < 0)
521 _vec_len (vm->mbuf_alloc_list) = n;
523 for (i = 0; i < n; i++)
525 mb = vm->mbuf_alloc_list[i];
527 ASSERT (rte_mbuf_refcnt_read (mb) == 0);
528 rte_mbuf_refcnt_set (mb, 1);
530 mb->data_off = RTE_PKTMBUF_HEADROOM;
533 b = vlib_buffer_from_rte_mbuf (mb);
534 bi = vlib_get_buffer_index (vm, b);
536 vec_add1_aligned (fl->aligned_buffers, bi, sizeof (vlib_copy_unit_t));
540 vlib_buffer_init_for_free_list (b, fl);
542 if (fl->buffer_init_function)
543 fl->buffer_init_function (vm, fl, &bi, 1);
552 copy_alignment (u32 * x)
554 return (pointer_to_uword (x) / sizeof (x[0])) % BUFFERS_PER_COPY;
558 alloc_from_free_list (vlib_main_t * vm,
559 vlib_buffer_free_list_t * free_list,
560 u32 * alloc_buffers, u32 n_alloc_buffers)
564 uword n_unaligned_start, n_unaligned_end, n_filled;
566 n_left = n_alloc_buffers;
568 n_unaligned_start = ((BUFFERS_PER_COPY - copy_alignment (dst))
569 & (BUFFERS_PER_COPY - 1));
571 n_filled = fill_free_list (vm, free_list, n_alloc_buffers);
575 n_left = n_filled < n_left ? n_filled : n_left;
576 n_alloc_buffers = n_left;
578 if (n_unaligned_start >= n_left)
580 n_unaligned_start = n_left;
584 n_unaligned_end = copy_alignment (dst + n_alloc_buffers);
586 fill_unaligned (vm, free_list, n_unaligned_start + n_unaligned_end);
588 u_len = vec_len (free_list->unaligned_buffers);
589 u_src = free_list->unaligned_buffers + u_len - 1;
591 if (n_unaligned_start)
593 uword n_copy = n_unaligned_start;
605 /* Now dst should be aligned. */
607 ASSERT (pointer_to_uword (dst) % sizeof (vlib_copy_unit_t) == 0);
612 vlib_copy_unit_t *d, *s;
615 if (vec_len (free_list->aligned_buffers) <
616 ((n_left / BUFFERS_PER_COPY) * BUFFERS_PER_COPY))
619 n_copy = n_left / BUFFERS_PER_COPY;
620 n_left = n_left % BUFFERS_PER_COPY;
622 /* Remove buffers from aligned free list. */
623 _vec_len (free_list->aligned_buffers) -= n_copy * BUFFERS_PER_COPY;
625 s = (vlib_copy_unit_t *) vec_end (free_list->aligned_buffers);
626 d = (vlib_copy_unit_t *) dst;
628 /* Fast path loop. */
651 /* Unaligned copy. */
652 ASSERT (n_unaligned_end == n_left);
660 if (!free_list->unaligned_buffers)
663 _vec_len (free_list->unaligned_buffers) = u_len;
665 return n_alloc_buffers;
668 /* Allocate a given number of buffers into given array.
669 Returns number actually allocated which will be either zero or
672 vlib_buffer_alloc (vlib_main_t * vm, u32 * buffers, u32 n_buffers)
674 vlib_buffer_main_t *bm = vm->buffer_main;
676 return alloc_from_free_list
678 pool_elt_at_index (bm->buffer_free_list_pool,
679 VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX),
684 vlib_buffer_alloc_from_free_list (vlib_main_t * vm,
686 u32 n_buffers, u32 free_list_index)
688 vlib_buffer_main_t *bm = vm->buffer_main;
689 vlib_buffer_free_list_t *f;
690 f = pool_elt_at_index (bm->buffer_free_list_pool, free_list_index);
691 return alloc_from_free_list (vm, f, buffers, n_buffers);
695 add_buffer_to_free_list (vlib_main_t * vm,
696 vlib_buffer_free_list_t * f,
697 u32 buffer_index, u8 do_init)
700 b = vlib_get_buffer (vm, buffer_index);
701 if (PREDICT_TRUE (do_init))
702 vlib_buffer_init_for_free_list (b, f);
703 vec_add1_aligned (f->aligned_buffers, buffer_index,
704 sizeof (vlib_copy_unit_t));
707 always_inline vlib_buffer_free_list_t *
708 buffer_get_free_list (vlib_main_t * vm, vlib_buffer_t * b, u32 * index)
710 vlib_buffer_main_t *bm = vm->buffer_main;
713 *index = i = b->free_list_index;
714 return pool_elt_at_index (bm->buffer_free_list_pool, i);
718 vlib_set_buffer_free_callback (vlib_main_t * vm, void *fp)
720 vlib_buffer_main_t *bm = vm->buffer_main;
721 void *rv = bm->buffer_free_callback;
723 bm->buffer_free_callback = fp;
727 static_always_inline void
728 vlib_buffer_free_inline (vlib_main_t * vm,
729 u32 * buffers, u32 n_buffers, u32 follow_buffer_next)
731 vlib_buffer_main_t *bm = vm->buffer_main;
732 vlib_buffer_free_list_t *fl;
735 u32 (*cb) (vlib_main_t * vm, u32 * buffers, u32 n_buffers,
736 u32 follow_buffer_next);
738 cb = bm->buffer_free_callback;
740 if (PREDICT_FALSE (cb != 0))
741 n_buffers = (*cb) (vm, buffers, n_buffers, follow_buffer_next);
746 for (i = 0; i < n_buffers; i++)
751 b = vlib_get_buffer (vm, buffers[i]);
753 fl = buffer_get_free_list (vm, b, &fi);
755 /* The only current use of this callback: multicast recycle */
756 if (PREDICT_FALSE (fl->buffers_added_to_freelist_function != 0))
760 add_buffer_to_free_list
761 (vm, fl, buffers[i], (b->flags & VLIB_BUFFER_RECYCLE) == 0);
763 for (j = 0; j < vec_len (bm->announce_list); j++)
765 if (fl == bm->announce_list[j])
766 goto already_announced;
768 vec_add1 (bm->announce_list, fl);
774 if (PREDICT_TRUE ((b->flags & VLIB_BUFFER_RECYCLE) == 0))
776 mb = rte_mbuf_from_vlib_buffer (b);
777 ASSERT (rte_mbuf_refcnt_read (mb) == 1);
778 rte_pktmbuf_free (mb);
782 if (vec_len (bm->announce_list))
784 vlib_buffer_free_list_t *fl;
785 for (i = 0; i < vec_len (bm->announce_list); i++)
787 fl = bm->announce_list[i];
788 fl->buffers_added_to_freelist_function (vm, fl);
790 _vec_len (bm->announce_list) = 0;
795 vlib_buffer_free (vlib_main_t * vm, u32 * buffers, u32 n_buffers)
797 vlib_buffer_free_inline (vm, buffers, n_buffers, /* follow_buffer_next */
802 vlib_buffer_free_no_next (vlib_main_t * vm, u32 * buffers, u32 n_buffers)
804 vlib_buffer_free_inline (vm, buffers, n_buffers, /* follow_buffer_next */
808 /* Copy template packet data into buffers as they are allocated. */
809 __attribute__ ((unused))
811 vlib_packet_template_buffer_init (vlib_main_t * vm,
812 vlib_buffer_free_list_t * fl,
813 u32 * buffers, u32 n_buffers)
815 vlib_packet_template_t *t =
816 uword_to_pointer (fl->buffer_init_function_opaque,
817 vlib_packet_template_t *);
820 for (i = 0; i < n_buffers; i++)
822 vlib_buffer_t *b = vlib_get_buffer (vm, buffers[i]);
823 ASSERT (b->current_length == vec_len (t->packet_data));
824 clib_memcpy (vlib_buffer_get_current (b), t->packet_data,
830 vlib_packet_template_init (vlib_main_t * vm,
831 vlib_packet_template_t * t,
833 uword n_packet_data_bytes,
834 uword min_n_buffers_each_physmem_alloc,
838 __attribute__ ((unused)) u8 *name;
841 name = va_format (0, fmt, &va);
844 vlib_worker_thread_barrier_sync (vm);
845 memset (t, 0, sizeof (t[0]));
847 vec_add (t->packet_data, packet_data, n_packet_data_bytes);
849 vlib_worker_thread_barrier_release (vm);
853 vlib_packet_template_get_packet (vlib_main_t * vm,
854 vlib_packet_template_t * t, u32 * bi_result)
859 if (vlib_buffer_alloc (vm, &bi, 1) != 1)
864 b = vlib_get_buffer (vm, bi);
865 clib_memcpy (vlib_buffer_get_current (b),
866 t->packet_data, vec_len (t->packet_data));
867 b->current_length = vec_len (t->packet_data);
869 /* Fix up mbuf header length fields */
871 mb = rte_mbuf_from_vlib_buffer (b);
872 mb->data_len = b->current_length;
873 mb->pkt_len = b->current_length;
878 /* Append given data to end of buffer, possibly allocating new buffers. */
880 vlib_buffer_add_data (vlib_main_t * vm,
882 u32 buffer_index, void *data, u32 n_data_bytes)
884 u32 n_buffer_bytes, n_left, n_left_this_buffer, bi;
890 && 1 != vlib_buffer_alloc_from_free_list (vm, &bi, 1, free_list_index))
894 n_left = n_data_bytes;
895 n_buffer_bytes = vlib_buffer_free_list_buffer_size (vm, free_list_index);
897 b = vlib_get_buffer (vm, bi);
898 b->flags &= ~VLIB_BUFFER_TOTAL_LENGTH_VALID;
900 /* Get to the end of the chain before we try to append data... */
901 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
902 b = vlib_get_buffer (vm, b->next_buffer);
908 ASSERT (n_buffer_bytes >= b->current_length);
910 n_buffer_bytes - (b->current_data + b->current_length);
911 n = clib_min (n_left_this_buffer, n_left);
912 clib_memcpy (vlib_buffer_get_current (b) + b->current_length, d, n);
913 b->current_length += n;
920 vlib_buffer_alloc_from_free_list (vm, &b->next_buffer, 1,
924 b->flags |= VLIB_BUFFER_NEXT_PRESENT;
926 b = vlib_get_buffer (vm, b->next_buffer);
932 clib_error ("out of buffers");
937 vlib_buffer_chain_append_data_with_alloc (vlib_main_t * vm,
939 vlib_buffer_t * first,
940 vlib_buffer_t ** last,
941 void *data, u16 data_len)
943 vlib_buffer_t *l = *last;
945 vlib_buffer_free_list_buffer_size (vm, free_list_index);
947 ASSERT (n_buffer_bytes >= l->current_length + l->current_data);
950 u16 max = n_buffer_bytes - l->current_length - l->current_data;
954 vlib_buffer_alloc_from_free_list (vm, &l->next_buffer, 1,
957 *last = l = vlib_buffer_chain_buffer (vm, first, l, l->next_buffer);
958 max = n_buffer_bytes - l->current_length - l->current_data;
961 u16 len = (data_len > max) ? max : data_len;
962 clib_memcpy (vlib_buffer_get_current (l) + l->current_length,
964 vlib_buffer_chain_increase_length (first, l, len);
972 * Fills in the required rte_mbuf fields for chained buffers given a VLIB chain.
975 vlib_buffer_chain_validate (vlib_main_t * vm, vlib_buffer_t * b_first)
977 vlib_buffer_t *b = b_first, *prev = b_first;
978 struct rte_mbuf *mb_prev, *mb, *mb_first;
980 mb_first = rte_mbuf_from_vlib_buffer (b_first);
982 mb_first->pkt_len = mb_first->data_len = b_first->current_length;
983 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
985 b = vlib_get_buffer (vm, b->next_buffer);
986 mb = rte_mbuf_from_vlib_buffer (b);
987 mb_prev = rte_mbuf_from_vlib_buffer (prev);
989 mb_first->pkt_len += b->current_length;
991 mb->data_len = b->current_length;
997 vlib_buffer_pool_create (vlib_main_t * vm, unsigned num_mbufs,
1000 vlib_buffer_main_t *bm = vm->buffer_main;
1001 vlib_physmem_main_t *vpm = &vm->physmem_main;
1002 struct rte_mempool *rmp;
1005 if (!rte_pktmbuf_pool_create)
1006 return clib_error_return (0, "not linked with DPDK");
1008 vec_validate_aligned (bm->pktmbuf_pools, socket_id, CLIB_CACHE_LINE_BYTES);
1010 /* pool already exists, nothing to do */
1011 if (bm->pktmbuf_pools[socket_id])
1014 u8 *pool_name = format (0, "mbuf_pool_socket%u%c", socket_id, 0);
1016 rmp = rte_pktmbuf_pool_create ((char *) pool_name, /* pool name */
1017 num_mbufs, /* number of mbufs */
1018 512, /* cache size */
1019 VLIB_BUFFER_HDR_SIZE, /* priv size */
1020 VLIB_BUFFER_PRE_DATA_SIZE + VLIB_BUFFER_DATA_SIZE, /* dataroom size */
1021 socket_id); /* cpu socket */
1026 uword this_pool_end;
1027 uword this_pool_start;
1028 uword this_pool_size;
1029 uword save_vpm_start, save_vpm_end, save_vpm_size;
1030 struct rte_mempool_memhdr *memhdr;
1032 this_pool_start = ~0ULL;
1033 this_pool_end = 0LL;
1035 STAILQ_FOREACH (memhdr, &rmp->mem_list, next)
1037 if (((uword) (memhdr->addr + memhdr->len)) > this_pool_end)
1038 this_pool_end = (uword) (memhdr->addr + memhdr->len);
1039 if (((uword) memhdr->addr) < this_pool_start)
1040 this_pool_start = (uword) (memhdr->addr);
1042 ASSERT (this_pool_start < ~0ULL && this_pool_end > 0);
1043 this_pool_size = this_pool_end - this_pool_start;
1047 clib_warning ("%s: pool start %llx pool end %llx pool size %lld",
1048 pool_name, this_pool_start, this_pool_end,
1051 ("before: virtual.start %llx virtual.end %llx virtual.size %lld",
1052 vpm->virtual.start, vpm->virtual.end, vpm->virtual.size);
1055 save_vpm_start = vpm->virtual.start;
1056 save_vpm_end = vpm->virtual.end;
1057 save_vpm_size = vpm->virtual.size;
1059 if ((this_pool_start < vpm->virtual.start) || vpm->virtual.start == 0)
1060 vpm->virtual.start = this_pool_start;
1061 if (this_pool_end > vpm->virtual.end)
1062 vpm->virtual.end = this_pool_end;
1064 vpm->virtual.size = vpm->virtual.end - vpm->virtual.start;
1069 ("after: virtual.start %llx virtual.end %llx virtual.size %lld",
1070 vpm->virtual.start, vpm->virtual.end, vpm->virtual.size);
1073 /* check if fits into buffer index range */
1074 if ((u64) vpm->virtual.size >
1075 ((u64) 1 << (32 + CLIB_LOG2_CACHE_LINE_BYTES)))
1077 clib_warning ("physmem: virtual size out of range!");
1078 vpm->virtual.start = save_vpm_start;
1079 vpm->virtual.end = save_vpm_end;
1080 vpm->virtual.size = save_vpm_size;
1086 bm->pktmbuf_pools[socket_id] = rmp;
1087 vec_free (pool_name);
1092 vec_free (pool_name);
1094 /* no usable pool for this socket, try to use pool from another one */
1095 for (i = 0; i < vec_len (bm->pktmbuf_pools); i++)
1097 if (bm->pktmbuf_pools[i])
1100 ("WARNING: Failed to allocate mempool for CPU socket %u. "
1101 "Threads running on socket %u will use socket %u mempool.",
1102 socket_id, socket_id, i);
1103 bm->pktmbuf_pools[socket_id] = bm->pktmbuf_pools[i];
1108 return clib_error_return (0, "failed to allocate mempool on socket %u",
1114 vlib_serialize_tx (serialize_main_header_t * m, serialize_stream_t * s)
1117 vlib_serialize_buffer_main_t *sm;
1118 uword n, n_bytes_to_write;
1119 vlib_buffer_t *last;
1121 n_bytes_to_write = s->current_buffer_index;
1123 uword_to_pointer (s->data_function_opaque,
1124 vlib_serialize_buffer_main_t *);
1127 ASSERT (sm->tx.max_n_data_bytes_per_chain > 0);
1128 if (serialize_stream_is_end_of_stream (s)
1129 || sm->tx.n_total_data_bytes + n_bytes_to_write >
1130 sm->tx.max_n_data_bytes_per_chain)
1132 vlib_process_t *p = vlib_get_current_process (vm);
1134 last = vlib_get_buffer (vm, sm->last_buffer);
1135 last->current_length = n_bytes_to_write;
1137 vlib_set_next_frame_buffer (vm, &p->node_runtime, sm->tx.next_index,
1140 sm->first_buffer = sm->last_buffer = ~0;
1141 sm->tx.n_total_data_bytes = 0;
1144 else if (n_bytes_to_write == 0 && s->n_buffer_bytes == 0)
1146 ASSERT (sm->first_buffer == ~0);
1147 ASSERT (sm->last_buffer == ~0);
1149 vlib_buffer_alloc_from_free_list (vm, &sm->first_buffer, 1,
1150 sm->tx.free_list_index);
1154 ("vlib_buffer_alloc_from_free_list fails"));
1155 sm->last_buffer = sm->first_buffer;
1157 vlib_buffer_free_list_buffer_size (vm, sm->tx.free_list_index);
1160 if (n_bytes_to_write > 0)
1162 vlib_buffer_t *prev = vlib_get_buffer (vm, sm->last_buffer);
1164 vlib_buffer_alloc_from_free_list (vm, &sm->last_buffer, 1,
1165 sm->tx.free_list_index);
1169 ("vlib_buffer_alloc_from_free_list fails"));
1170 sm->tx.n_total_data_bytes += n_bytes_to_write;
1171 prev->current_length = n_bytes_to_write;
1172 prev->next_buffer = sm->last_buffer;
1173 prev->flags |= VLIB_BUFFER_NEXT_PRESENT;
1176 if (sm->last_buffer != ~0)
1178 last = vlib_get_buffer (vm, sm->last_buffer);
1179 s->buffer = vlib_buffer_get_current (last);
1180 s->current_buffer_index = 0;
1181 ASSERT (last->current_data == s->current_buffer_index);
1186 vlib_serialize_rx (serialize_main_header_t * m, serialize_stream_t * s)
1189 vlib_serialize_buffer_main_t *sm;
1190 vlib_buffer_t *last;
1193 uword_to_pointer (s->data_function_opaque,
1194 vlib_serialize_buffer_main_t *);
1197 if (serialize_stream_is_end_of_stream (s))
1200 if (sm->last_buffer != ~0)
1202 last = vlib_get_buffer (vm, sm->last_buffer);
1204 if (last->flags & VLIB_BUFFER_NEXT_PRESENT)
1205 sm->last_buffer = last->next_buffer;
1208 vlib_buffer_free (vm, &sm->first_buffer, /* count */ 1);
1209 sm->first_buffer = sm->last_buffer = ~0;
1213 if (sm->last_buffer == ~0)
1215 while (clib_fifo_elts (sm->rx.buffer_fifo) == 0)
1217 sm->rx.ready_one_time_event =
1218 vlib_process_create_one_time_event (vm, vlib_current_process (vm),
1220 vlib_process_wait_for_one_time_event (vm, /* no event data */ 0,
1221 sm->rx.ready_one_time_event);
1224 clib_fifo_sub1 (sm->rx.buffer_fifo, sm->first_buffer);
1225 sm->last_buffer = sm->first_buffer;
1228 ASSERT (sm->last_buffer != ~0);
1230 last = vlib_get_buffer (vm, sm->last_buffer);
1231 s->current_buffer_index = 0;
1232 s->buffer = vlib_buffer_get_current (last);
1233 s->n_buffer_bytes = last->current_length;
1237 serialize_open_vlib_helper (serialize_main_t * m,
1239 vlib_serialize_buffer_main_t * sm, uword is_read)
1241 /* Initialize serialize main but save overflow buffer for re-use between calls. */
1243 u8 *save = m->stream.overflow_buffer;
1244 memset (m, 0, sizeof (m[0]));
1245 m->stream.overflow_buffer = save;
1247 _vec_len (save) = 0;
1250 sm->first_buffer = sm->last_buffer = ~0;
1252 clib_fifo_reset (sm->rx.buffer_fifo);
1254 sm->tx.n_total_data_bytes = 0;
1256 m->header.data_function = is_read ? vlib_serialize_rx : vlib_serialize_tx;
1257 m->stream.data_function_opaque = pointer_to_uword (sm);
1261 serialize_open_vlib_buffer (serialize_main_t * m, vlib_main_t * vm,
1262 vlib_serialize_buffer_main_t * sm)
1264 serialize_open_vlib_helper (m, vm, sm, /* is_read */ 0);
1268 unserialize_open_vlib_buffer (serialize_main_t * m, vlib_main_t * vm,
1269 vlib_serialize_buffer_main_t * sm)
1271 serialize_open_vlib_helper (m, vm, sm, /* is_read */ 1);
1275 serialize_close_vlib_buffer (serialize_main_t * m)
1277 vlib_serialize_buffer_main_t *sm
1278 = uword_to_pointer (m->stream.data_function_opaque,
1279 vlib_serialize_buffer_main_t *);
1280 vlib_buffer_t *last;
1281 serialize_stream_t *s = &m->stream;
1283 last = vlib_get_buffer (sm->vlib_main, sm->last_buffer);
1284 last->current_length = s->current_buffer_index;
1286 if (vec_len (s->overflow_buffer) > 0)
1289 = vlib_buffer_add_data (sm->vlib_main, sm->tx.free_list_index,
1290 sm->last_buffer == ~0 ? 0 : sm->last_buffer,
1292 vec_len (s->overflow_buffer));
1293 _vec_len (s->overflow_buffer) = 0;
1296 return sm->first_buffer;
1300 unserialize_close_vlib_buffer (serialize_main_t * m)
1302 vlib_serialize_buffer_main_t *sm
1303 = uword_to_pointer (m->stream.data_function_opaque,
1304 vlib_serialize_buffer_main_t *);
1305 if (sm->first_buffer != ~0)
1306 vlib_buffer_free_one (sm->vlib_main, sm->first_buffer);
1307 clib_fifo_reset (sm->rx.buffer_fifo);
1308 if (m->stream.overflow_buffer)
1309 _vec_len (m->stream.overflow_buffer) = 0;
1313 format_vlib_buffer_free_list (u8 * s, va_list * va)
1315 vlib_buffer_free_list_t *f = va_arg (*va, vlib_buffer_free_list_t *);
1316 u32 threadnum = va_arg (*va, u32);
1317 uword bytes_alloc, bytes_free, n_free, size;
1320 return format (s, "%=7s%=30s%=12s%=12s%=12s%=12s%=12s%=12s",
1321 "Thread", "Name", "Index", "Size", "Alloc", "Free",
1324 size = sizeof (vlib_buffer_t) + f->n_data_bytes;
1325 n_free = vec_len (f->aligned_buffers) + vec_len (f->unaligned_buffers);
1326 bytes_alloc = size * f->n_alloc;
1327 bytes_free = size * n_free;
1329 s = format (s, "%7d%30s%12d%12d%=12U%=12U%=12d%=12d",
1331 f->name, f->index, f->n_data_bytes,
1332 format_memory_size, bytes_alloc,
1333 format_memory_size, bytes_free, f->n_alloc, n_free);
1338 static clib_error_t *
1339 show_buffers (vlib_main_t * vm,
1340 unformat_input_t * input, vlib_cli_command_t * cmd)
1342 vlib_buffer_main_t *bm;
1343 vlib_buffer_free_list_t *f;
1344 vlib_main_t *curr_vm;
1347 vlib_cli_output (vm, "%U", format_vlib_buffer_free_list, 0, 0);
1351 curr_vm = vec_len (vlib_mains) ? vlib_mains[vm_index] : vm;
1352 bm = curr_vm->buffer_main;
1355 pool_foreach (f, bm->buffer_free_list_pool, ({
1356 vlib_cli_output (vm, "%U", format_vlib_buffer_free_list, f, vm_index);
1362 while (vm_index < vec_len (vlib_mains));
1368 VLIB_CLI_COMMAND (show_buffers_command, static) = {
1369 .path = "show buffers",
1370 .short_help = "Show packet buffer allocation",
1371 .function = show_buffers,
1377 u32 *vlib_buffer_state_validation_lock;
1378 uword *vlib_buffer_state_validation_hash;
1379 void *vlib_buffer_state_heap;
1381 static clib_error_t *
1382 buffer_state_validation_init (vlib_main_t * vm)
1386 vlib_buffer_state_heap = mheap_alloc (0, 10 << 20);
1388 oldheap = clib_mem_set_heap (vlib_buffer_state_heap);
1390 vlib_buffer_state_validation_hash = hash_create (0, sizeof (uword));
1391 vec_validate_aligned (vlib_buffer_state_validation_lock, 0,
1392 CLIB_CACHE_LINE_BYTES);
1393 clib_mem_set_heap (oldheap);
1397 VLIB_INIT_FUNCTION (buffer_state_validation_init);
1402 * fd.io coding-style-patch-verification: ON
1405 * eval: (c-set-style "gnu")