2 * Copyright (c) 2017 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.
43 * Allocate/free network buffers.
46 #include <rte_config.h>
48 #include <rte_common.h>
50 #include <rte_memory.h>
51 #include <rte_memzone.h>
52 #include <rte_tailq.h>
54 #include <rte_per_lcore.h>
55 #include <rte_launch.h>
56 #include <rte_atomic.h>
57 #include <rte_cycles.h>
58 #include <rte_prefetch.h>
59 #include <rte_lcore.h>
60 #include <rte_per_lcore.h>
61 #include <rte_branch_prediction.h>
62 #include <rte_interrupts.h>
64 #include <rte_random.h>
65 #include <rte_debug.h>
66 #include <rte_ether.h>
67 #include <rte_ethdev.h>
69 #include <rte_mempool.h>
71 #include <rte_version.h>
73 #include <vlib/vlib.h>
74 #include <vnet/vnet.h>
75 #include <vnet/devices/dpdk/dpdk.h>
76 #include <vnet/devices/dpdk/dpdk_priv.h>
79 STATIC_ASSERT (VLIB_BUFFER_PRE_DATA_SIZE == RTE_PKTMBUF_HEADROOM,
80 "VLIB_BUFFER_PRE_DATA_SIZE must be equal to RTE_PKTMBUF_HEADROOM");
83 del_free_list (vlib_main_t * vm, vlib_buffer_free_list_t * f)
89 for (i = 0; i < vec_len (f->buffers); i++)
91 b = vlib_get_buffer (vm, f->buffers[i]);
92 mb = rte_mbuf_from_vlib_buffer (b);
93 ASSERT (rte_mbuf_refcnt_read (mb) == 1);
94 rte_pktmbuf_free (mb);
97 vec_free (f->buffers);
100 /* Add buffer free list. */
102 dpdk_buffer_delete_free_list (vlib_main_t * vm, u32 free_list_index)
104 vlib_buffer_main_t *bm = vm->buffer_main;
105 vlib_buffer_free_list_t *f;
109 ASSERT (os_get_cpu_number () == 0);
111 f = vlib_buffer_get_free_list (vm, free_list_index);
113 merge_index = vlib_buffer_get_free_list_with_size (vm, f->n_data_bytes);
114 if (merge_index != ~0 && merge_index != free_list_index)
116 vlib_buffer_merge_free_lists (pool_elt_at_index
117 (bm->buffer_free_list_pool, merge_index),
121 del_free_list (vm, f);
124 memset (f, 0xab, sizeof (f[0]));
126 pool_put (bm->buffer_free_list_pool, f);
128 for (i = 1; i < vec_len (vlib_mains); i++)
130 bm = vlib_mains[i]->buffer_main;
131 f = vlib_buffer_get_free_list (vlib_mains[i], free_list_index);;
132 memset (f, 0xab, sizeof (f[0]));
133 pool_put (bm->buffer_free_list_pool, f);
137 /* Make sure free list has at least given number of free buffers. */
139 fill_free_list (vlib_main_t * vm,
140 vlib_buffer_free_list_t * fl, uword min_free_buffers)
142 dpdk_main_t *dm = &dpdk_main;
146 u32 n_remaining = 0, n_alloc = 0;
147 unsigned socket_id = rte_socket_id ();
148 struct rte_mempool *rmp = dm->pktmbuf_pools[socket_id];
152 if (PREDICT_FALSE (rmp == 0))
155 /* Already have enough free buffers on free list? */
156 n = min_free_buffers - vec_len (fl->buffers);
158 return min_free_buffers;
160 /* Always allocate round number of buffers. */
161 n = round_pow2 (n, CLIB_CACHE_LINE_BYTES / sizeof (u32));
163 /* Always allocate new buffers in reasonably large sized chunks. */
164 n = clib_max (n, fl->min_n_buffers_each_physmem_alloc);
166 vec_validate (vm->mbuf_alloc_list, n - 1);
168 if (rte_mempool_get_bulk (rmp, vm->mbuf_alloc_list, n) < 0)
171 _vec_len (vm->mbuf_alloc_list) = n;
173 for (i = 0; i < n; i++)
175 mb = vm->mbuf_alloc_list[i];
177 ASSERT (rte_mbuf_refcnt_read (mb) == 0);
178 rte_mbuf_refcnt_set (mb, 1);
180 b = vlib_buffer_from_rte_mbuf (mb);
181 bi = vlib_get_buffer_index (vm, b);
183 vec_add1_aligned (fl->buffers, bi, CLIB_CACHE_LINE_BYTES);
187 vlib_buffer_init_for_free_list (b, fl);
189 if (fl->buffer_init_function)
190 fl->buffer_init_function (vm, fl, &bi, 1);
199 alloc_from_free_list (vlib_main_t * vm,
200 vlib_buffer_free_list_t * free_list,
201 u32 * alloc_buffers, u32 n_alloc_buffers)
208 n_filled = fill_free_list (vm, free_list, n_alloc_buffers);
212 len = vec_len (free_list->buffers);
213 ASSERT (len >= n_alloc_buffers);
215 src = free_list->buffers + len - n_alloc_buffers;
216 clib_memcpy (dst, src, n_alloc_buffers * sizeof (u32));
218 _vec_len (free_list->buffers) -= n_alloc_buffers;
220 return n_alloc_buffers;
223 /* Allocate a given number of buffers into given array.
224 Returns number actually allocated which will be either zero or
227 dpdk_buffer_alloc (vlib_main_t * vm, u32 * buffers, u32 n_buffers)
229 vlib_buffer_main_t *bm = vm->buffer_main;
231 return alloc_from_free_list
233 pool_elt_at_index (bm->buffer_free_list_pool,
234 VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX),
240 dpdk_buffer_alloc_from_free_list (vlib_main_t * vm,
242 u32 n_buffers, u32 free_list_index)
244 vlib_buffer_main_t *bm = vm->buffer_main;
245 vlib_buffer_free_list_t *f;
246 f = pool_elt_at_index (bm->buffer_free_list_pool, free_list_index);
247 return alloc_from_free_list (vm, f, buffers, n_buffers);
250 static_always_inline void
251 vlib_buffer_free_inline (vlib_main_t * vm,
252 u32 * buffers, u32 n_buffers, u32 follow_buffer_next)
254 vlib_buffer_main_t *bm = vm->buffer_main;
255 vlib_buffer_free_list_t *fl;
258 u32 (*cb) (vlib_main_t * vm, u32 * buffers, u32 n_buffers,
259 u32 follow_buffer_next);
261 cb = bm->buffer_free_callback;
263 if (PREDICT_FALSE (cb != 0))
264 n_buffers = (*cb) (vm, buffers, n_buffers, follow_buffer_next);
269 for (i = 0; i < n_buffers; i++)
274 b = vlib_get_buffer (vm, buffers[i]);
276 fl = vlib_buffer_get_buffer_free_list (vm, b, &fi);
278 /* The only current use of this callback: multicast recycle */
279 if (PREDICT_FALSE (fl->buffers_added_to_freelist_function != 0))
283 vlib_buffer_add_to_free_list
284 (vm, fl, buffers[i], (b->flags & VLIB_BUFFER_RECYCLE) == 0);
286 for (j = 0; j < vec_len (bm->announce_list); j++)
288 if (fl == bm->announce_list[j])
289 goto already_announced;
291 vec_add1 (bm->announce_list, fl);
297 if (PREDICT_TRUE ((b->flags & VLIB_BUFFER_RECYCLE) == 0))
299 mb = rte_mbuf_from_vlib_buffer (b);
300 ASSERT (rte_mbuf_refcnt_read (mb) == 1);
301 rte_pktmbuf_free (mb);
305 if (vec_len (bm->announce_list))
307 vlib_buffer_free_list_t *fl;
308 for (i = 0; i < vec_len (bm->announce_list); i++)
310 fl = bm->announce_list[i];
311 fl->buffers_added_to_freelist_function (vm, fl);
313 _vec_len (bm->announce_list) = 0;
318 dpdk_buffer_free (vlib_main_t * vm, u32 * buffers, u32 n_buffers)
320 vlib_buffer_free_inline (vm, buffers, n_buffers, /* follow_buffer_next */
325 dpdk_buffer_free_no_next (vlib_main_t * vm, u32 * buffers, u32 n_buffers)
327 vlib_buffer_free_inline (vm, buffers, n_buffers, /* follow_buffer_next */
332 dpdk_packet_template_init (vlib_main_t * vm,
335 uword n_packet_data_bytes,
336 uword min_n_buffers_each_physmem_alloc, u8 * name)
338 vlib_packet_template_t *t = (vlib_packet_template_t *) vt;
340 vlib_worker_thread_barrier_sync (vm);
341 memset (t, 0, sizeof (t[0]));
343 vec_add (t->packet_data, packet_data, n_packet_data_bytes);
345 vlib_worker_thread_barrier_release (vm);
349 vlib_buffer_pool_create (vlib_main_t * vm, unsigned num_mbufs,
352 dpdk_main_t *dm = &dpdk_main;
353 vlib_physmem_main_t *vpm = &vm->physmem_main;
354 struct rte_mempool *rmp;
357 vec_validate_aligned (dm->pktmbuf_pools, socket_id, CLIB_CACHE_LINE_BYTES);
359 /* pool already exists, nothing to do */
360 if (dm->pktmbuf_pools[socket_id])
363 u8 *pool_name = format (0, "mbuf_pool_socket%u%c", socket_id, 0);
365 rmp = rte_pktmbuf_pool_create ((char *) pool_name, /* pool name */
366 num_mbufs, /* number of mbufs */
367 512, /* cache size */
368 VLIB_BUFFER_HDR_SIZE, /* priv size */
369 VLIB_BUFFER_PRE_DATA_SIZE + VLIB_BUFFER_DATA_SIZE, /* dataroom size */
370 socket_id); /* cpu socket */
376 uword this_pool_start;
377 uword this_pool_size;
378 uword save_vpm_start, save_vpm_end, save_vpm_size;
379 struct rte_mempool_memhdr *memhdr;
381 this_pool_start = ~0ULL;
384 STAILQ_FOREACH (memhdr, &rmp->mem_list, next)
386 if (((uword) (memhdr->addr + memhdr->len)) > this_pool_end)
387 this_pool_end = (uword) (memhdr->addr + memhdr->len);
388 if (((uword) memhdr->addr) < this_pool_start)
389 this_pool_start = (uword) (memhdr->addr);
391 ASSERT (this_pool_start < ~0ULL && this_pool_end > 0);
392 this_pool_size = this_pool_end - this_pool_start;
396 clib_warning ("%s: pool start %llx pool end %llx pool size %lld",
397 pool_name, this_pool_start, this_pool_end,
400 ("before: virtual.start %llx virtual.end %llx virtual.size %lld",
401 vpm->virtual.start, vpm->virtual.end, vpm->virtual.size);
404 save_vpm_start = vpm->virtual.start;
405 save_vpm_end = vpm->virtual.end;
406 save_vpm_size = vpm->virtual.size;
408 if ((this_pool_start < vpm->virtual.start) || vpm->virtual.start == 0)
409 vpm->virtual.start = this_pool_start;
410 if (this_pool_end > vpm->virtual.end)
411 vpm->virtual.end = this_pool_end;
413 vpm->virtual.size = vpm->virtual.end - vpm->virtual.start;
418 ("after: virtual.start %llx virtual.end %llx virtual.size %lld",
419 vpm->virtual.start, vpm->virtual.end, vpm->virtual.size);
422 /* check if fits into buffer index range */
423 if ((u64) vpm->virtual.size >
424 ((u64) 1 << (32 + CLIB_LOG2_CACHE_LINE_BYTES)))
426 clib_warning ("physmem: virtual size out of range!");
427 vpm->virtual.start = save_vpm_start;
428 vpm->virtual.end = save_vpm_end;
429 vpm->virtual.size = save_vpm_size;
435 dm->pktmbuf_pools[socket_id] = rmp;
436 vec_free (pool_name);
441 vec_free (pool_name);
443 /* no usable pool for this socket, try to use pool from another one */
444 for (i = 0; i < vec_len (dm->pktmbuf_pools); i++)
446 if (dm->pktmbuf_pools[i])
449 ("WARNING: Failed to allocate mempool for CPU socket %u. "
450 "Threads running on socket %u will use socket %u mempool.",
451 socket_id, socket_id, i);
452 dm->pktmbuf_pools[socket_id] = dm->pktmbuf_pools[i];
457 return clib_error_return (0, "failed to allocate mempool on socket %u",
463 u32 *vlib_buffer_state_validation_lock;
464 uword *vlib_buffer_state_validation_hash;
465 void *vlib_buffer_state_heap;
467 static clib_error_t *
468 buffer_state_validation_init (vlib_main_t * vm)
472 vlib_buffer_state_heap = mheap_alloc (0, 10 << 20);
474 oldheap = clib_mem_set_heap (vlib_buffer_state_heap);
476 vlib_buffer_state_validation_hash = hash_create (0, sizeof (uword));
477 vec_validate_aligned (vlib_buffer_state_validation_lock, 0,
478 CLIB_CACHE_LINE_BYTES);
479 clib_mem_set_heap (oldheap);
483 VLIB_INIT_FUNCTION (buffer_state_validation_init);
486 static vlib_buffer_callbacks_t callbacks = {
487 .vlib_buffer_alloc_cb = &dpdk_buffer_alloc,
488 .vlib_buffer_alloc_from_free_list_cb = &dpdk_buffer_alloc_from_free_list,
489 .vlib_buffer_free_cb = &dpdk_buffer_free,
490 .vlib_buffer_free_no_next_cb = &dpdk_buffer_free_no_next,
491 .vlib_packet_template_init_cb = &dpdk_packet_template_init,
492 .vlib_buffer_delete_free_list_cb = &dpdk_buffer_delete_free_list,
495 static clib_error_t *
496 dpdk_buffer_init (vlib_main_t * vm)
498 vlib_buffer_cb_register (vm, &callbacks);
502 VLIB_INIT_FUNCTION (dpdk_buffer_init);
506 * fd.io coding-style-patch-verification: ON
509 * eval: (c-set-style "gnu")