2 * Copyright (c) 2016-2019 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 #include <svm/fifo_segment.h>
17 #include <vppinfra/mem.h>
20 fsh_alloc_aligned (fifo_segment_header_t *fsh, uword size, uword align)
22 uword cur_pos, cur_pos_align, new_pos;
24 cur_pos = clib_atomic_load_relax_n (&fsh->byte_index);
25 cur_pos_align = round_pow2_u64 (cur_pos, align);
26 size = round_pow2_u64 (size, align);
27 new_pos = cur_pos_align + size;
29 if (new_pos >= fsh->max_byte_index)
32 while (!clib_atomic_cmp_and_swap_acq_relax (&fsh->byte_index, &cur_pos,
33 &new_pos, 1 /* weak */))
35 cur_pos_align = round_pow2_u64 (cur_pos, align);
36 new_pos = cur_pos_align + size;
37 if (new_pos >= fsh->max_byte_index)
40 return uword_to_pointer ((u8 *) fsh + cur_pos_align, void *);
44 fsh_alloc (fifo_segment_header_t *fsh, uword size)
46 return fsh_alloc_aligned (fsh, size, 8);
49 static inline fifo_segment_slice_t *
50 fsh_slice_get (fifo_segment_header_t * fsh, u32 slice_index)
52 return &fsh->slices[slice_index];
55 static inline fifo_slice_private_t *
56 fs_slice_private_get (fifo_segment_t *fs, u32 slice_index)
58 ASSERT (slice_index < fs->n_slices);
59 return &fs->slices[slice_index];
62 static char *fifo_segment_mem_status_strings[] = {
63 #define _(sym,str) str,
64 foreach_segment_mem_status
69 fsh_n_free_bytes (fifo_segment_header_t * fsh)
71 uword cur_pos = clib_atomic_load_relax_n (&fsh->byte_index);
72 ASSERT (fsh->max_byte_index > cur_pos);
73 return fsh->max_byte_index - cur_pos;
77 fsh_cached_bytes_add (fifo_segment_header_t * fsh, uword size)
79 clib_atomic_fetch_add_rel (&fsh->n_cached_bytes, size);
83 fsh_cached_bytes_sub (fifo_segment_header_t * fsh, uword size)
85 clib_atomic_fetch_sub_rel (&fsh->n_cached_bytes, size);
89 fsh_n_cached_bytes (fifo_segment_header_t * fsh)
91 uword n_cached = clib_atomic_load_relax_n (&fsh->n_cached_bytes);
96 fsh_active_fifos_update (fifo_segment_header_t * fsh, int inc)
98 clib_atomic_fetch_add_rel (&fsh->n_active_fifos, inc);
102 fsh_n_active_fifos (fifo_segment_header_t * fsh)
104 return clib_atomic_load_relax_n (&fsh->n_active_fifos);
108 fsh_virtual_mem (fifo_segment_header_t * fsh)
110 fifo_segment_slice_t *fss;
114 for (i = 0; i < fsh->n_slices; i++)
116 fss = fsh_slice_get (fsh, i);
117 total_vm += clib_atomic_load_relax_n (&fss->virtual_mem);
123 fsh_virtual_mem_update (fifo_segment_header_t * fsh, u32 slice_index,
126 fifo_segment_slice_t *fss = fsh_slice_get (fsh, slice_index);
127 fss->virtual_mem += n_bytes;
131 fss_chunk_freelist_lock (fifo_segment_slice_t *fss)
134 while (!clib_atomic_cmp_and_swap_acq_relax_n (&fss->chunk_lock, &free, 1, 0))
136 /* atomic load limits number of compare_exchange executions */
137 while (clib_atomic_load_relax_n (&fss->chunk_lock))
139 /* on failure, compare_exchange writes (*p)->lock into free */
145 fss_chunk_freelist_unlock (fifo_segment_slice_t *fss)
147 /* Make sure all reads/writes are complete before releasing the lock */
148 clib_atomic_release (&fss->chunk_lock);
152 fss_chunk_fl_index_is_valid (fifo_segment_slice_t * fss, u32 fl_index)
154 return (fl_index < FS_CHUNK_VEC_LEN);
158 fss_chunk_free_list_push (fifo_segment_header_t *fsh,
159 fifo_segment_slice_t *fss, u32 fl_index,
162 fss_chunk_freelist_lock (fss);
163 c->next = fss->free_chunks[fl_index];
164 fss->free_chunks[fl_index] = fs_chunk_sptr (fsh, c);
165 fss_chunk_freelist_unlock (fss);
169 fss_chunk_free_list_push_list (fifo_segment_header_t *fsh,
170 fifo_segment_slice_t *fss, u32 fl_index,
171 svm_fifo_chunk_t *head, svm_fifo_chunk_t *tail)
173 fss_chunk_freelist_lock (fss);
174 tail->next = fss->free_chunks[fl_index];
175 fss->free_chunks[fl_index] = fs_chunk_sptr (fsh, head);
176 fss_chunk_freelist_unlock (fss);
179 static svm_fifo_chunk_t *
180 fss_chunk_free_list_pop (fifo_segment_header_t *fsh, fifo_segment_slice_t *fss,
185 ASSERT (fss_chunk_fl_index_is_valid (fss, fl_index));
187 fss_chunk_freelist_lock (fss);
189 if (!fss->free_chunks[fl_index])
191 fss_chunk_freelist_unlock (fss);
195 c = fs_chunk_ptr (fsh, fss->free_chunks[fl_index]);
196 fss->free_chunks[fl_index] = c->next;
198 fss_chunk_freelist_unlock (fss);
204 fss_fifo_free_list_push (fifo_segment_header_t *fsh, fifo_segment_slice_t *fss,
205 svm_fifo_shared_t *sf)
207 sf->next = fss->free_fifos;
208 fss->free_fifos = fs_sptr (fsh, sf);
212 fss_fifo_free_list_push_list (fifo_segment_header_t *fsh,
213 fifo_segment_slice_t *fss,
214 svm_fifo_shared_t *head, svm_fifo_shared_t *tail)
216 tail->next = fss->free_fifos;
217 fss->free_fifos = fs_sptr (fsh, head);
221 fss_fifo_free_list_pop (fifo_segment_header_t *fsh, fifo_segment_slice_t *fss)
223 svm_fifo_shared_t *sf;
224 sf = fs_ptr (fsh, fss->free_fifos);
225 fss->free_fifos = sf->next;
230 pfss_fifo_add_active_list (fifo_slice_private_t *pfss, svm_fifo_t *f)
232 if (pfss->active_fifos)
234 pfss->active_fifos->prev = f;
235 f->next = pfss->active_fifos;
237 pfss->active_fifos = f;
241 pfss_fifo_del_active_list (fifo_slice_private_t *pfss, svm_fifo_t *f)
243 if (f->flags & SVM_FIFO_F_LL_TRACKED)
246 f->prev->next = f->next;
248 pfss->active_fifos = f->next;
250 f->next->prev = f->prev;
255 fss_fl_chunk_bytes (fifo_segment_slice_t * fss)
257 return clib_atomic_load_relax_n (&fss->n_fl_chunk_bytes);
261 fss_fl_chunk_bytes_add (fifo_segment_slice_t * fss, uword size)
263 clib_atomic_fetch_add_relax (&fss->n_fl_chunk_bytes, size);
267 fss_fl_chunk_bytes_sub (fifo_segment_slice_t * fss, uword size)
269 clib_atomic_fetch_sub_relax (&fss->n_fl_chunk_bytes, size);
273 * Initialize fifo segment shared header
276 fifo_segment_init (fifo_segment_t * fs)
278 u32 align = 8, offset = 2 * 4096, slices_sz, i;
279 uword max_fifo, seg_start, seg_sz;
280 fifo_segment_header_t *fsh;
281 ssvm_shared_header_t *sh;
284 /* TODO remove ssvm heap entirely */
287 seg_data = (u8 *) sh + offset;
288 seg_sz = sh->ssvm_size - offset;
290 fs->n_slices = clib_max (fs->n_slices, 1);
291 slices_sz = sizeof (fifo_segment_slice_t) * fs->n_slices;
293 seg_start = round_pow2_u64 (pointer_to_uword (seg_data), align);
294 fsh = uword_to_pointer (seg_start, void *);
295 memset (fsh, 0, sizeof (*fsh) + slices_sz);
297 fsh->byte_index = sizeof (*fsh) + slices_sz;
298 fsh->max_byte_index = seg_sz;
299 fsh->n_slices = fs->n_slices;
300 max_fifo = clib_min ((seg_sz - slices_sz) / 2, FIFO_SEGMENT_MAX_FIFO_SIZE);
301 fsh->max_log2_fifo_size = min_log2 (max_fifo);
302 fsh->n_cached_bytes = 0;
303 fsh->n_reserved_bytes = fsh->byte_index;
304 fsh->start_byte_index = fsh->byte_index;
305 ASSERT (fsh->max_byte_index <= sh->ssvm_size - offset);
307 fs->max_byte_index = fsh->max_byte_index;
309 sh->opaque[0] = (void *) ((u8 *) fsh - (u8 *) fs->ssvm.sh);
311 /* Allow random offsets */
312 fs->ssvm.sh->ssvm_va = 0;
314 vec_validate (fs->slices, fs->n_slices - 1);
315 for (i = 0; i < fs->n_slices; i++)
316 fs->slices[i].fifos =
317 clib_mem_bulk_init (sizeof (svm_fifo_t), CLIB_CACHE_LINE_BYTES, 32);
324 * Create a fifo segment and initialize as master
327 fifo_segment_create (fifo_segment_main_t * sm, fifo_segment_create_args_t * a)
333 /* Allocate a fresh segment */
334 pool_get_zero (sm->segments, fs);
336 baseva = a->segment_type == SSVM_SEGMENT_PRIVATE ? ~0ULL : sm->next_baseva;
337 fs->ssvm.ssvm_size = a->segment_size;
338 fs->ssvm.is_server = 1;
339 fs->ssvm.my_pid = getpid ();
340 fs->ssvm.name = format (0, "%s%c", a->segment_name, 0);
341 fs->ssvm.requested_va = baseva;
343 if ((rv = ssvm_server_init (&fs->ssvm, a->segment_type)))
345 pool_put (sm->segments, fs);
349 /* Note: requested_va updated due to seg base addr randomization */
350 sm->next_baseva = fs->ssvm.sh->ssvm_va + fs->ssvm.ssvm_size;
352 fifo_segment_init (fs);
353 vec_add1 (a->new_segment_indices, fs - sm->segments);
358 * Attach as slave to a fifo segment
361 fifo_segment_attach (fifo_segment_main_t * sm, fifo_segment_create_args_t * a)
363 fifo_segment_header_t *fsh;
367 pool_get_zero (sm->segments, fs);
369 fs->ssvm.ssvm_size = a->segment_size;
370 fs->ssvm.my_pid = getpid ();
371 fs->ssvm.name = format (0, "%s%c", a->segment_name, 0);
372 fs->ssvm.requested_va = 0;
373 if (a->segment_type == SSVM_SEGMENT_MEMFD)
374 fs->ssvm.fd = a->memfd_fd;
376 fs->ssvm.attach_timeout = sm->timeout_in_seconds;
378 if ((rv = ssvm_client_init (&fs->ssvm, a->segment_type)))
380 pool_put (sm->segments, fs);
384 /* Probably a segment without fifos */
385 if (!fs->ssvm.sh->opaque[0])
388 fsh = fs->h = (void *) fs->ssvm.sh + (uword) fs->ssvm.sh->opaque[0];
389 fs->max_byte_index = fsh->max_byte_index;
390 vec_validate (fs->slices, 0);
391 fs->slices[0].fifos =
392 clib_mem_bulk_init (sizeof (svm_fifo_t), CLIB_CACHE_LINE_BYTES, 32);
395 vec_add1 (a->new_segment_indices, fs - sm->segments);
400 fifo_segment_delete (fifo_segment_main_t * sm, fifo_segment_t * s)
402 fifo_segment_cleanup (s);
403 ssvm_delete (&s->ssvm);
404 clib_memset (s, 0xfe, sizeof (*s));
405 pool_put (sm->segments, s);
409 fifo_segment_index (fifo_segment_main_t * sm, fifo_segment_t * s)
411 return s - sm->segments;
415 fifo_segment_get_segment (fifo_segment_main_t * sm, u32 segment_index)
417 return pool_elt_at_index (sm->segments, segment_index);
421 fifo_segment_info (fifo_segment_t * seg, char **address, size_t * size)
423 *address = (char *) seg->ssvm.sh->ssvm_va;
424 *size = seg->ssvm.ssvm_size;
428 fifo_segment_main_init (fifo_segment_main_t * sm, u64 baseva,
429 u32 timeout_in_seconds)
431 sm->next_baseva = baseva;
432 sm->timeout_in_seconds = timeout_in_seconds;
436 fs_freelist_for_size (u32 size)
438 if (PREDICT_FALSE (size < FIFO_SEGMENT_MIN_FIFO_SIZE))
440 return clib_min (max_log2 (size) - FIFO_SEGMENT_MIN_LOG2_FIFO_SIZE,
441 FS_CHUNK_VEC_LEN - 1);
445 fs_freelist_index_to_size (u32 fl_index)
447 return 1 << (fl_index + FIFO_SEGMENT_MIN_LOG2_FIFO_SIZE);
451 fs_chunk_size_is_valid (fifo_segment_header_t * fsh, u32 size)
454 * 4K minimum. It's not likely that anything good will happen
455 * with a smaller FIFO.
457 return size >= FIFO_SEGMENT_MIN_FIFO_SIZE &&
458 size <= (1ULL << fsh->max_log2_fifo_size);
462 fs_try_alloc_multi_chunk (fifo_segment_header_t * fsh,
463 fifo_segment_slice_t * fss, u32 data_bytes)
465 u32 fl_index, fl_size, n_alloc = 0, req_bytes = data_bytes;
466 svm_fifo_chunk_t *c, *first = 0, *next;
468 fl_index = fs_freelist_for_size (req_bytes);
472 fl_size = fs_freelist_index_to_size (fl_index);
476 c = fss_chunk_free_list_pop (fsh, fss, fl_index);
479 c->next = fs_chunk_sptr (fsh, first);
482 req_bytes -= clib_min (fl_size, req_bytes);
486 /* Failed to allocate with smaller chunks */
489 /* Free all chunks if any allocated */
493 fl_index = fs_freelist_for_size (c->length);
494 next = fs_chunk_ptr (fsh, c->next);
495 fss_chunk_free_list_push (fsh, fss, fl_index, c);
500 /* As last attempt, try allocating a chunk larger than
501 * the requested size, if possible */
502 fl_index = fs_freelist_for_size (data_bytes) + 1;
503 if (!fss_chunk_fl_index_is_valid (fss, fl_index))
505 first = fss_chunk_free_list_pop (fsh, fss, fl_index);
509 n_alloc = fs_freelist_index_to_size (fl_index);
515 fl_size = fl_size >> 1;
520 fss_fl_chunk_bytes_sub (fss, n_alloc);
521 fsh_cached_bytes_sub (fsh, n_alloc);
526 fsh_try_alloc_fifo_hdr_batch (fifo_segment_header_t * fsh,
527 fifo_segment_slice_t * fss, u32 batch_size)
529 svm_fifo_shared_t *f, *head = 0, *tail;
534 ASSERT (batch_size != 0);
536 size = (uword) sizeof (*f) * batch_size;
538 fmem = fsh_alloc_aligned (fsh, size, CLIB_CACHE_LINE_BYTES);
542 /* Carve fifo hdr space */
543 tail = f = (svm_fifo_shared_t *) fmem;
544 for (i = 0; i < batch_size; i++)
546 clib_memset (f, 0, sizeof (*f));
547 f->next = fs_sptr (fsh, head);
550 f = (svm_fifo_shared_t *) fmem;
553 fss_fifo_free_list_push_list (fsh, fss, head, tail);
559 fsh_try_alloc_chunk_batch (fifo_segment_header_t * fsh,
560 fifo_segment_slice_t * fss,
561 u32 fl_index, u32 batch_size)
563 svm_fifo_chunk_t *c, *head = 0, *tail;
564 uword size, total_chunk_bytes;
565 u32 rounded_data_size;
569 ASSERT (batch_size != 0);
571 rounded_data_size = fs_freelist_index_to_size (fl_index);
572 total_chunk_bytes = (uword) batch_size *rounded_data_size;
573 size = (uword) (sizeof (*c) + rounded_data_size) * batch_size;
575 cmem = fsh_alloc_aligned (fsh, size, 8 /* chunk hdr is 24B */);
579 /* Carve fifo + chunk space */
580 tail = c = (svm_fifo_chunk_t *) cmem;
581 for (i = 0; i < batch_size; i++)
584 c->length = rounded_data_size;
585 c->next = fs_chunk_sptr (fsh, head);
587 cmem += sizeof (*c) + rounded_data_size;
588 c = (svm_fifo_chunk_t *) cmem;
591 fss_chunk_free_list_push_list (fsh, fss, fl_index, head, tail);
592 fss->num_chunks[fl_index] += batch_size;
593 fss_fl_chunk_bytes_add (fss, total_chunk_bytes);
594 fsh_cached_bytes_add (fsh, total_chunk_bytes);
600 fs_try_alloc_fifo_batch (fifo_segment_header_t * fsh,
601 fifo_segment_slice_t * fss,
602 u32 fl_index, u32 batch_size)
604 if (fsh_try_alloc_fifo_hdr_batch (fsh, fss, batch_size))
606 return fsh_try_alloc_chunk_batch (fsh, fss, fl_index, batch_size);
609 static svm_fifo_shared_t *
610 fsh_try_alloc_fifo_hdr (fifo_segment_header_t *fsh, fifo_segment_slice_t *fss)
612 svm_fifo_shared_t *sf;
614 if (!fss->free_fifos)
616 if (fsh_try_alloc_fifo_hdr_batch (fsh, fss,
617 FIFO_SEGMENT_ALLOC_BATCH_SIZE))
621 sf = fss_fifo_free_list_pop (fsh, fss);
622 clib_memset (sf, 0, sizeof (*sf));
627 static svm_fifo_chunk_t *
628 fsh_try_alloc_chunk (fifo_segment_header_t * fsh,
629 fifo_segment_slice_t * fss, u32 data_bytes)
634 fl_index = fs_freelist_for_size (data_bytes);
637 c = fss_chunk_free_list_pop (fsh, fss, fl_index);
641 fss_fl_chunk_bytes_sub (fss, fs_freelist_index_to_size (fl_index));
642 fsh_cached_bytes_sub (fsh, fs_freelist_index_to_size (fl_index));
646 u32 chunk_size, batch = FIFO_SEGMENT_ALLOC_BATCH_SIZE;
649 chunk_size = fs_freelist_index_to_size (fl_index);
650 n_free = fsh_n_free_bytes (fsh);
652 if (chunk_size <= n_free)
654 batch = chunk_size * batch <= n_free ? batch : 1;
655 if (!fsh_try_alloc_chunk_batch (fsh, fss, fl_index, batch))
658 /* Failed to allocate larger chunk, try to allocate multi-chunk
659 * that is close to what was actually requested */
660 if (data_bytes <= fss_fl_chunk_bytes (fss))
662 c = fs_try_alloc_multi_chunk (fsh, fss, data_bytes);
665 batch = n_free / FIFO_SEGMENT_MIN_FIFO_SIZE;
666 if (!batch || fsh_try_alloc_chunk_batch (fsh, fss, 0, batch))
669 if (data_bytes <= fss_fl_chunk_bytes (fss) + n_free)
671 u32 min_size = FIFO_SEGMENT_MIN_FIFO_SIZE;
673 batch = (data_bytes - fss_fl_chunk_bytes (fss)) / min_size;
674 batch = clib_min (batch + 1, n_free / min_size);
675 if (fsh_try_alloc_chunk_batch (fsh, fss, 0, batch))
677 c = fs_try_alloc_multi_chunk (fsh, fss, data_bytes);
687 * Try to allocate new fifo
689 * Tries the following steps in order:
690 * - grab fifo and chunk from freelists
691 * - batch fifo and chunk allocation
692 * - single fifo allocation
693 * - grab multiple fifo chunks from freelists
695 static svm_fifo_shared_t *
696 fs_try_alloc_fifo (fifo_segment_header_t *fsh, u32 slice_index, u32 data_bytes)
698 fifo_segment_slice_t *fss;
699 u32 fl_index, min_size;
701 svm_fifo_shared_t *sf = 0;
703 fss = fsh_slice_get (fsh, slice_index);
704 min_size = clib_max ((fsh->pct_first_alloc * data_bytes) / 100, 4096);
705 fl_index = fs_freelist_for_size (min_size);
707 if (!fss_chunk_fl_index_is_valid (fss, fl_index))
710 sf = fsh_try_alloc_fifo_hdr (fsh, fss);
714 c = fsh_try_alloc_chunk (fsh, fss, min_size);
717 fss_fifo_free_list_push (fsh, fss, sf);
721 sf->start_chunk = fs_chunk_sptr (fsh, c);
723 c = fs_chunk_ptr (fsh, c->next);
724 sf->end_chunk = fs_chunk_sptr (fsh, c);
725 sf->size = data_bytes;
726 sf->slice_index = slice_index;
732 fsh_alloc_chunk (fifo_segment_header_t * fsh, u32 slice_index, u32 chunk_size)
734 fifo_segment_slice_t *fss;
737 fss = fsh_slice_get (fsh, slice_index);
738 c = fsh_try_alloc_chunk (fsh, fss, chunk_size);
744 fsh_slice_collect_chunks (fifo_segment_header_t * fsh,
745 fifo_segment_slice_t * fss, svm_fifo_chunk_t * c)
747 u32 n_collect = 0, fl_index;
748 svm_fifo_chunk_t *next;
752 CLIB_MEM_UNPOISON (c, sizeof (*c));
753 next = fs_chunk_ptr (fsh, c->next);
754 fl_index = fs_freelist_for_size (c->length);
755 fss_chunk_free_list_push (fsh, fss, fl_index, c);
756 n_collect += fs_freelist_index_to_size (fl_index);
760 fss_fl_chunk_bytes_add (fss, n_collect);
761 fsh_cached_bytes_add (fsh, n_collect);
765 fsh_collect_chunks (fifo_segment_header_t * fsh, u32 slice_index,
766 svm_fifo_chunk_t * c)
768 fifo_segment_slice_t *fss;
769 fss = fsh_slice_get (fsh, slice_index);
770 fsh_slice_collect_chunks (fsh, fss, c);
774 fs_fifo_alloc (fifo_segment_t *fs, u32 slice_index)
776 fifo_slice_private_t *pfss = &fs->slices[slice_index];
779 f = clib_mem_bulk_alloc (pfss->fifos);
780 clib_memset (f, 0, sizeof (*f));
785 fs_fifo_free (fifo_segment_t *fs, svm_fifo_t *f)
787 u32 slice_index = f->shr->slice_index;
788 fifo_slice_private_t *pfss;
791 clib_memset (f, 0xfc, sizeof (*f));
793 pfss = &fs->slices[slice_index];
794 clib_mem_bulk_free (pfss->fifos, f);
798 fifo_segment_cleanup (fifo_segment_t *fs)
803 for (slice_index = 0; slice_index < fs->n_slices; slice_index++)
804 clib_mem_bulk_destroy (fs->slices[slice_index].fifos);
806 vec_foreach (fs->mqs, mq)
807 vec_free (mq->rings);
813 * Allocate fifo in fifo segment
816 fifo_segment_alloc_fifo_w_slice (fifo_segment_t * fs, u32 slice_index,
817 u32 data_bytes, fifo_segment_ftype_t ftype)
819 fifo_segment_header_t *fsh = fs->h;
820 fifo_slice_private_t *pfss;
821 fifo_segment_slice_t *fss;
822 svm_fifo_shared_t *sf;
825 ASSERT (slice_index < fs->n_slices);
827 if (PREDICT_FALSE (data_bytes > 1 << fsh->max_log2_fifo_size))
830 sf = fs_try_alloc_fifo (fsh, slice_index, data_bytes);
834 f = fs_fifo_alloc (fs, slice_index);
838 svm_fifo_init (f, data_bytes);
840 fss = fsh_slice_get (fsh, slice_index);
841 pfss = fs_slice_private_get (fs, slice_index);
843 /* If rx fifo type add to active fifos list. When cleaning up segment,
844 * we need a list of active sessions that should be disconnected. Since
845 * both rx and tx fifos keep pointers to the session, it's enough to track
847 if (ftype == FIFO_SEGMENT_RX_FIFO)
849 pfss_fifo_add_active_list (pfss, f);
850 f->flags |= SVM_FIFO_F_LL_TRACKED;
853 fsh_active_fifos_update (fsh, 1);
854 fss->virtual_mem += svm_fifo_size (f);
861 fifo_segment_alloc_fifo_w_offset (fifo_segment_t *fs, uword offset)
863 svm_fifo_t *f = fs_fifo_alloc (fs, 0);
864 svm_fifo_shared_t *sf;
866 sf = (svm_fifo_shared_t *) ((u8 *) fs->h + offset);
870 f->ooos_list_head = OOO_SEGMENT_INVALID_INDEX;
871 f->segment_index = SVM_FIFO_INVALID_INDEX;
877 * Free fifo allocated in fifo segment
880 fifo_segment_free_fifo (fifo_segment_t * fs, svm_fifo_t * f)
882 fifo_segment_header_t *fsh = fs->h;
883 fifo_slice_private_t *pfss;
884 fifo_segment_slice_t *fss;
885 svm_fifo_shared_t *sf;
887 ASSERT (f->refcnt > 0);
893 * Cleanup shared state
897 fss = fsh_slice_get (fsh, sf->slice_index);
898 pfss = fs_slice_private_get (fs, sf->slice_index);
900 /* Free fifo chunks */
901 fsh_slice_collect_chunks (fsh, fss, fs_chunk_ptr (fsh, f->shr->start_chunk));
903 sf->start_chunk = sf->end_chunk = 0;
904 sf->head_chunk = sf->tail_chunk = 0;
906 /* Add to free list */
907 fss_fifo_free_list_push (fsh, fss, sf);
909 fss->virtual_mem -= svm_fifo_size (f);
912 * Cleanup private state
915 /* Remove from active list. Only rx fifos are tracked */
916 if (f->flags & SVM_FIFO_F_LL_TRACKED)
918 pfss_fifo_del_active_list (pfss, f);
919 f->flags &= ~SVM_FIFO_F_LL_TRACKED;
922 svm_fifo_free_chunk_lookup (f);
923 svm_fifo_free_ooo_data (f);
927 sf->master_session_index = ~0;
928 f->master_thread_index = ~0;
931 f->ooo_enq = f->ooo_deq = 0;
934 fs_fifo_free (fs, f);
936 fsh_active_fifos_update (fsh, -1);
940 fifo_segment_detach_fifo (fifo_segment_t *fs, svm_fifo_t **f)
942 fifo_slice_private_t *pfss;
943 fifo_segment_slice_t *fss;
944 u32 fl_index, slice_index;
945 svm_fifo_chunk_t **c;
948 slice_index = of->master_thread_index;
949 fss = fsh_slice_get (fs->h, slice_index);
950 pfss = fs_slice_private_get (fs, slice_index);
951 fss->virtual_mem -= svm_fifo_size (of);
952 if (of->flags & SVM_FIFO_F_LL_TRACKED)
953 pfss_fifo_del_active_list (pfss, of);
955 /* Update slice counts for chunks that were detached */
956 vec_foreach (c, of->chunks_at_attach)
958 fl_index = fs_freelist_for_size ((*c)->length);
959 clib_atomic_fetch_sub_rel (&fss->num_chunks[fl_index], 1);
961 vec_free (of->chunks_at_attach);
963 clib_mem_bulk_free (pfss->fifos, *f);
968 fifo_segment_attach_fifo (fifo_segment_t *fs, svm_fifo_t **f, u32 slice_index)
970 fifo_slice_private_t *pfss;
971 fifo_segment_slice_t *fss;
976 nf = fs_fifo_alloc (fs, slice_index);
977 clib_memcpy_fast (nf, *f, sizeof (*nf));
979 fss = fsh_slice_get (fs->h, slice_index);
980 pfss = fs_slice_private_get (fs, slice_index);
981 fss->virtual_mem += svm_fifo_size (nf);
982 nf->next = nf->prev = 0;
983 if (nf->flags & SVM_FIFO_F_LL_TRACKED)
984 pfss_fifo_add_active_list (pfss, nf);
986 /* Update allocated chunks for fifo segment and build list
987 * of chunks to be freed at detach */
989 of->chunks_at_attach = 0;
991 c = fs_chunk_ptr (fs->h, nf->shr->start_chunk);
994 fl_index = fs_freelist_for_size (c->length);
995 clib_atomic_fetch_add_rel (&fss->num_chunks[fl_index], 1);
996 vec_add1 (of->chunks_at_attach, c);
997 c = fs_chunk_ptr (fs->h, c->next);
1000 nf->shr->slice_index = slice_index;
1005 fifo_segment_fifo_offset (svm_fifo_t *f)
1007 return (u8 *) f->shr - (u8 *) f->fs_hdr;
1011 fifo_segment_msg_q_alloc (fifo_segment_t *fs, u32 mq_index,
1012 svm_msg_q_cfg_t *cfg)
1014 fifo_segment_header_t *fsh = fs->h;
1015 svm_msg_q_shared_t *smq;
1022 u32 n_mqs = clib_max (fs->h->n_mqs, 1);
1023 vec_validate (fs->mqs, n_mqs - 1);
1026 size = svm_msg_q_size_to_alloc (cfg);
1027 base = fsh_alloc_aligned (fsh, size, 8);
1028 fsh->n_reserved_bytes += size;
1030 smq = svm_msg_q_init (base, cfg);
1031 mq = vec_elt_at_index (fs->mqs, mq_index);
1032 svm_msg_q_attach (mq, smq);
1038 fifo_segment_msg_q_attach (fifo_segment_t *fs, uword offset, u32 mq_index)
1044 u32 n_mqs = clib_max (fs->h->n_mqs, 1);
1045 vec_validate (fs->mqs, n_mqs - 1);
1048 mq = vec_elt_at_index (fs->mqs, mq_index);
1052 svm_msg_q_shared_t *smq;
1053 smq = (svm_msg_q_shared_t *) ((u8 *) fs->h + offset);
1054 svm_msg_q_attach (mq, smq);
1057 ASSERT (fifo_segment_msg_q_offset (fs, mq_index) == offset);
1063 fifo_segment_msg_qs_discover (fifo_segment_t *fs, int *fds, u32 n_fds)
1065 svm_msg_q_shared_t *smq;
1067 uword offset = 0, n_alloced;
1070 n_mqs = fs->h->n_mqs;
1071 if (n_fds && n_mqs != n_fds)
1073 clib_warning ("expected %u fds got %u", n_mqs, n_fds);
1077 vec_validate (fs->mqs, n_mqs - 1);
1078 n_alloced = fs->h->n_reserved_bytes - fs->h->start_byte_index;
1079 ASSERT (n_alloced % n_mqs == 0);
1080 size = n_alloced / n_mqs;
1082 offset = fs->h->start_byte_index;
1083 for (i = 0; i < n_mqs; i++)
1085 mq = vec_elt_at_index (fs->mqs, i);
1086 smq = (svm_msg_q_shared_t *) ((u8 *) fs->h + offset);
1087 svm_msg_q_attach (mq, smq);
1089 svm_msg_q_set_eventfd (mq, fds[i]);
1095 fifo_segment_msg_q_offset (fifo_segment_t *fs, u32 mq_index)
1097 svm_msg_q_t *mq = vec_elt_at_index (fs->mqs, mq_index);
1102 return (uword) ((u8 *) mq->q.shr - (u8 *) fs->h) -
1103 sizeof (svm_msg_q_shared_t);
1107 fifo_segment_prealloc_fifo_hdrs (fifo_segment_t * fs, u32 slice_index,
1110 fifo_segment_header_t *fsh = fs->h;
1111 fifo_segment_slice_t *fss;
1113 fss = fsh_slice_get (fsh, slice_index);
1114 return fsh_try_alloc_fifo_hdr_batch (fsh, fss, batch_size);
1118 fifo_segment_prealloc_fifo_chunks (fifo_segment_t * fs, u32 slice_index,
1119 u32 chunk_size, u32 batch_size)
1121 fifo_segment_header_t *fsh = fs->h;
1122 fifo_segment_slice_t *fss;
1125 if (!fs_chunk_size_is_valid (fsh, chunk_size))
1127 clib_warning ("chunk size out of range %d", chunk_size);
1131 fl_index = fs_freelist_for_size (chunk_size);
1132 fss = fsh_slice_get (fsh, slice_index);
1134 return fsh_try_alloc_chunk_batch (fsh, fss, fl_index, batch_size);
1138 * Pre-allocates fifo pairs in fifo segment
1141 fifo_segment_preallocate_fifo_pairs (fifo_segment_t * fs,
1142 u32 rx_fifo_size, u32 tx_fifo_size,
1145 u32 rx_rounded_data_size, tx_rounded_data_size, pair_size, pairs_to_alloc;
1146 u32 hdrs, pairs_per_slice, alloc_now;
1147 fifo_segment_header_t *fsh = fs->h;
1148 int rx_fl_index, tx_fl_index, i;
1149 fifo_segment_slice_t *fss;
1150 uword space_available;
1152 /* Parameter check */
1153 if (rx_fifo_size == 0 || tx_fifo_size == 0 || *n_fifo_pairs == 0)
1156 if (!fs_chunk_size_is_valid (fsh, rx_fifo_size))
1158 clib_warning ("rx fifo_size out of range %d", rx_fifo_size);
1162 if (!fs_chunk_size_is_valid (fsh, tx_fifo_size))
1164 clib_warning ("tx fifo_size out of range %d", tx_fifo_size);
1168 rx_rounded_data_size = (1 << (max_log2 (rx_fifo_size)));
1169 rx_fl_index = fs_freelist_for_size (rx_fifo_size);
1170 tx_rounded_data_size = (1 << (max_log2 (tx_fifo_size)));
1171 tx_fl_index = fs_freelist_for_size (tx_fifo_size);
1173 hdrs = sizeof (svm_fifo_t) + sizeof (svm_fifo_chunk_t);
1175 /* Calculate space requirements */
1176 pair_size = 2 * hdrs + rx_rounded_data_size + tx_rounded_data_size;
1177 space_available = fsh_n_free_bytes (fsh);
1178 pairs_to_alloc = space_available / pair_size;
1179 pairs_to_alloc = clib_min (pairs_to_alloc, *n_fifo_pairs);
1180 pairs_per_slice = pairs_to_alloc / fs->n_slices;
1181 pairs_per_slice += pairs_to_alloc % fs->n_slices ? 1 : 0;
1183 if (!pairs_per_slice)
1186 for (i = 0; i < fs->n_slices; i++)
1188 alloc_now = clib_min (pairs_per_slice, *n_fifo_pairs);
1192 fss = fsh_slice_get (fsh, i);
1193 if (fs_try_alloc_fifo_batch (fsh, fss, rx_fl_index, alloc_now))
1194 clib_warning ("rx prealloc failed: pairs %u", alloc_now);
1195 if (fs_try_alloc_fifo_batch (fsh, fss, tx_fl_index, alloc_now))
1196 clib_warning ("tx prealloc failed: pairs %u", alloc_now);
1198 /* Account for the pairs allocated */
1199 *n_fifo_pairs -= alloc_now;
1204 * Get number of active fifos
1207 fifo_segment_num_fifos (fifo_segment_t * fs)
1209 return fsh_n_active_fifos (fs->h);
1213 fs_slice_num_free_fifos (fifo_segment_header_t *fsh, fifo_segment_slice_t *fss)
1215 svm_fifo_shared_t *f;
1218 f = fs_ptr (fsh, fss->free_fifos);
1224 f = fs_ptr (fsh, f->next);
1231 fifo_segment_num_free_fifos (fifo_segment_t * fs)
1233 fifo_segment_header_t *fsh = fs->h;
1234 fifo_segment_slice_t *fss;
1238 for (slice_index = 0; slice_index < fs->n_slices; slice_index++)
1240 fss = fsh_slice_get (fsh, slice_index);
1241 count += fs_slice_num_free_fifos (fsh, fss);
1247 fs_slice_num_free_chunks (fifo_segment_header_t *fsh,
1248 fifo_segment_slice_t *fss, u32 size)
1250 u32 count = 0, rounded_size, fl_index;
1251 svm_fifo_chunk_t *c;
1254 /* Count all free chunks? */
1257 for (i = 0; i < FS_CHUNK_VEC_LEN; i++)
1259 c = fs_chunk_ptr (fsh, fss->free_chunks[i]);
1265 c = fs_chunk_ptr (fsh, c->next);
1272 rounded_size = (1 << (max_log2 (size)));
1273 fl_index = fs_freelist_for_size (rounded_size);
1275 if (fl_index >= FS_CHUNK_VEC_LEN)
1278 c = fs_chunk_ptr (fsh, fss->free_chunks[fl_index]);
1284 c = fs_chunk_ptr (fsh, c->next);
1291 fifo_segment_num_free_chunks (fifo_segment_t * fs, u32 size)
1293 fifo_segment_header_t *fsh = fs->h;
1294 fifo_segment_slice_t *fss;
1298 for (slice_index = 0; slice_index < fs->n_slices; slice_index++)
1300 fss = fsh_slice_get (fsh, slice_index);
1301 count += fs_slice_num_free_chunks (fsh, fss, size);
1307 fifo_segment_size (fifo_segment_t * fs)
1309 return fs->h->max_byte_index - fs->h->n_reserved_bytes;
1313 fsh_has_reached_mem_limit (fifo_segment_header_t * fsh)
1315 return (fsh->flags & FIFO_SEGMENT_F_MEM_LIMIT) ? 1 : 0;
1319 fsh_reset_mem_limit (fifo_segment_header_t * fsh)
1321 fsh->flags &= ~FIFO_SEGMENT_F_MEM_LIMIT;
1325 fifo_segment_alloc (fifo_segment_t *fs, uword size)
1327 void *rv = fsh_alloc (fs->h, size);
1328 /* Mark externally allocated bytes as reserved. This helps
1329 * @ref fifo_segment_size report bytes used only for fifos */
1330 fs->h->n_reserved_bytes += size;
1335 fifo_segment_free_bytes (fifo_segment_t * fs)
1337 return fsh_n_free_bytes (fs->h);
1341 fifo_segment_cached_bytes (fifo_segment_t * fs)
1343 return fsh_n_cached_bytes (fs->h);
1347 fifo_segment_available_bytes (fifo_segment_t * fs)
1349 return fsh_n_free_bytes (fs->h) + fsh_n_cached_bytes (fs->h);
1353 fifo_segment_fl_chunk_bytes (fifo_segment_t * fs)
1355 fifo_segment_header_t *fsh = fs->h;
1356 fifo_segment_slice_t *fss;
1360 for (slice_index = 0; slice_index < fs->n_slices; slice_index++)
1362 fss = fsh_slice_get (fsh, slice_index);
1363 n_bytes += fss_fl_chunk_bytes (fss);
1370 fifo_segment_has_fifos (fifo_segment_t * fs)
1372 return (fsh_n_active_fifos (fs->h) != 0);
1376 fifo_segment_get_slice_fifo_list (fifo_segment_t * fs, u32 slice_index)
1378 fifo_slice_private_t *pfss;
1380 pfss = fs_slice_private_get (fs, slice_index);
1381 return pfss->active_fifos;
1385 fifo_segment_get_mem_usage (fifo_segment_t * fs)
1389 size = fifo_segment_size (fs);
1391 size - fifo_segment_free_bytes (fs) - fifo_segment_cached_bytes (fs);
1392 return (in_use * 100) / size;
1395 fifo_segment_mem_status_t
1396 fifo_segment_determine_status (fifo_segment_header_t * fsh, u8 usage)
1398 if (!fsh->high_watermark || !fsh->low_watermark)
1399 return MEMORY_PRESSURE_NO_PRESSURE;
1401 /* once the no-memory is detected, the status continues
1402 * until memory usage gets below the high watermark
1404 if (fsh_has_reached_mem_limit (fsh))
1406 if (usage >= fsh->high_watermark)
1407 return MEMORY_PRESSURE_NO_MEMORY;
1409 fsh_reset_mem_limit (fsh);
1412 if (usage >= fsh->high_watermark)
1413 return MEMORY_PRESSURE_HIGH_PRESSURE;
1415 else if (usage >= fsh->low_watermark)
1416 return MEMORY_PRESSURE_LOW_PRESSURE;
1418 return MEMORY_PRESSURE_NO_PRESSURE;
1421 fifo_segment_mem_status_t
1422 fifo_segment_get_mem_status (fifo_segment_t * fs)
1424 fifo_segment_header_t *fsh = fs->h;
1425 u8 usage = fifo_segment_get_mem_usage (fs);
1427 return fifo_segment_determine_status (fsh, usage);
1431 format_fifo_segment_type (u8 * s, va_list * args)
1434 sp = va_arg (*args, fifo_segment_t *);
1435 ssvm_segment_type_t st = ssvm_type (&sp->ssvm);
1437 if (st == SSVM_SEGMENT_PRIVATE)
1438 s = format (s, "%s", "private");
1439 else if (st == SSVM_SEGMENT_MEMFD)
1440 s = format (s, "%s", "memfd");
1441 else if (st == SSVM_SEGMENT_SHM)
1442 s = format (s, "%s", "shm");
1444 s = format (s, "%s", "unknown");
1449 * Segment format function
1452 format_fifo_segment (u8 * s, va_list * args)
1454 u32 count, indent, active_fifos, free_fifos;
1455 fifo_segment_t *fs = va_arg (*args, fifo_segment_t *);
1456 int verbose __attribute__ ((unused)) = va_arg (*args, int);
1457 uword est_chunk_bytes, est_free_seg_bytes, free_chunks;
1458 uword chunk_bytes = 0, free_seg_bytes, chunk_size;
1459 uword tracked_cached_bytes;
1460 uword fifo_hdr = 0, reserved;
1461 fifo_segment_header_t *fsh;
1462 fifo_segment_slice_t *fss;
1463 svm_fifo_chunk_t *c;
1468 uword allocated, in_use, virt;
1470 fifo_segment_mem_status_t mem_st;
1472 indent = format_get_indent (s) + 2;
1476 s = format (s, "%-20s%10s%15s%15s%15s%15s", "Name", "Type",
1477 "HeapSize (M)", "ActiveFifos", "FreeFifos", "Address");
1481 fifo_segment_info (fs, &address, &size);
1482 active_fifos = fifo_segment_num_fifos (fs);
1483 free_fifos = fifo_segment_num_free_fifos (fs);
1485 s = format (s, "%-20v%10U%15llu%15u%15u%15llx", ssvm_name (&fs->ssvm),
1486 format_fifo_segment_type, fs, size >> 20ULL, active_fifos,
1487 free_fifos, address);
1494 free_chunks = fifo_segment_num_free_chunks (fs, ~0);
1497 format (s, "\n\n%UFree/Allocated chunks by size:\n", format_white_space,
1500 s = format (s, "\n");
1502 for (slice_index = 0; slice_index < fs->n_slices; slice_index++)
1504 fss = fsh_slice_get (fsh, slice_index);
1505 for (i = 0; i < FS_CHUNK_VEC_LEN; i++)
1507 c = fs_chunk_ptr (fsh, fss->free_chunks[i]);
1508 if (c == 0 && fss->num_chunks[i] == 0)
1513 c = fs_chunk_ptr (fsh, c->next);
1517 chunk_size = fs_freelist_index_to_size (i);
1518 s = format (s, "%U%-5u kB: %u/%u\n", format_white_space, indent + 2,
1519 chunk_size >> 10, count, fss->num_chunks[i]);
1521 chunk_bytes += count * chunk_size;
1525 fifo_hdr = free_fifos * sizeof (svm_fifo_t);
1526 est_chunk_bytes = fifo_segment_fl_chunk_bytes (fs);
1527 est_free_seg_bytes = fifo_segment_free_bytes (fs);
1528 free_seg_bytes = fifo_segment_free_bytes (fs);
1529 tracked_cached_bytes = fifo_segment_cached_bytes (fs);
1530 allocated = fifo_segment_size (fs);
1531 in_use = fifo_segment_size (fs) - est_free_seg_bytes - tracked_cached_bytes;
1532 usage = (100.0 * in_use) / allocated;
1533 mem_st = fifo_segment_get_mem_status (fs);
1534 virt = fsh_virtual_mem (fsh);
1535 reserved = fsh->n_reserved_bytes;
1537 s = format (s, "\n%Useg free bytes: %U (%lu) estimated: %U (%lu) reserved:"
1538 " %U (%lu)\n", format_white_space, indent + 2,
1539 format_memory_size, free_seg_bytes, free_seg_bytes,
1540 format_memory_size, est_free_seg_bytes, est_free_seg_bytes,
1541 format_memory_size, reserved, reserved);
1542 s = format (s, "%Uchunk free bytes: %U (%lu) estimated: %U (%lu) tracked:"
1543 " %U (%lu)\n", format_white_space, indent + 2,
1544 format_memory_size, chunk_bytes, chunk_bytes,
1545 format_memory_size, est_chunk_bytes, est_chunk_bytes,
1546 format_memory_size, tracked_cached_bytes, tracked_cached_bytes);
1547 s = format (s, "%Ufifo active: %u hdr free bytes: %U (%u) \n",
1548 format_white_space, indent + 2, fsh->n_active_fifos,
1549 format_memory_size, fifo_hdr, fifo_hdr);
1550 s = format (s, "%Usegment usage: %.2f%% (%U / %U) virt: %U status: %s\n",
1551 format_white_space, indent + 2, usage, format_memory_size,
1552 in_use, format_memory_size, allocated, format_memory_size, virt,
1553 fifo_segment_mem_status_strings[mem_st]);
1554 s = format (s, "\n");
1560 * fd.io coding-style-patch-verification: ON
1563 * eval: (c-set-style "gnu")