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>
18 static char *fifo_segment_mem_status_strings[] = {
19 #define _(sym,str) str,
20 foreach_segment_mem_status
25 * Fifo segment free space
27 * Queries the underlying memory manager, dlmalloc, for free space. Since this
28 * ends up walking the internal data structures, it should not be called
31 * @param fs fifo segment
32 * @return number of free bytes
35 fsh_free_space (fifo_segment_header_t * fsh)
37 struct dlmallinfo dlminfo;
39 dlminfo = mspace_mallinfo (fsh->ssvm_sh->heap);
40 return dlminfo.fordblks;
44 fsh_free_bytes_sub (fifo_segment_header_t * fsh, int size)
46 clib_atomic_fetch_sub_rel (&fsh->n_free_bytes, size);
50 fsh_n_free_bytes (fifo_segment_header_t * fsh)
52 uword n_free = clib_atomic_load_relax_n (&fsh->n_free_bytes);
53 return n_free > fsh->n_reserved_bytes ? n_free - fsh->n_reserved_bytes : 0;
57 fsh_update_free_bytes (fifo_segment_header_t * fsh)
59 clib_atomic_store_rel_n (&fsh->n_free_bytes, fsh_free_space (fsh));
63 fsh_cached_bytes_add (fifo_segment_header_t * fsh, int size)
65 clib_atomic_fetch_add_rel (&fsh->n_cached_bytes, size);
69 fsh_cached_bytes_sub (fifo_segment_header_t * fsh, int size)
71 clib_atomic_fetch_sub_rel (&fsh->n_cached_bytes, size);
75 fsh_n_cached_bytes (fifo_segment_header_t * fsh)
77 uword n_cached = clib_atomic_load_relax_n (&fsh->n_cached_bytes);
82 fsh_check_mem (fifo_segment_header_t * fsh)
86 if (fsh->flags & FIFO_SEGMENT_F_MEM_LIMIT)
89 thresh = clib_max (0.01 * fsh->ssvm_sh->ssvm_size,
90 2 * fsh->n_reserved_bytes);
91 if (fsh->n_free_bytes > thresh)
94 fsh->flags |= FIFO_SEGMENT_F_MEM_LIMIT;
95 fsh_update_free_bytes (fsh);
98 static inline fifo_segment_slice_t *
99 fsh_slice_get (fifo_segment_header_t * fsh, u32 slice_index)
101 return &fsh->slices[slice_index];
105 fsh_active_fifos_update (fifo_segment_header_t * fsh, int inc)
107 clib_atomic_fetch_add_rel (&fsh->n_active_fifos, inc);
111 * Initialize fifo segment shared header
114 fifo_segment_init (fifo_segment_t * fs)
116 fifo_segment_header_t *fsh;
117 fifo_segment_slice_t *fss;
118 ssvm_shared_header_t *sh;
125 oldheap = ssvm_push_heap (sh);
128 * Manually align the fifo segment header to sizeof(uword) = 8 bytes.
129 * Long story made short: the "process-private" fifo segment
130 * is allocated from the main heap, not mmapped. dlmalloc
131 * only guarantees 4-byte alignment, and on aarch64
132 * the fsh can end up 4-byte but not 8-byte aligned.
133 * That eventually causes the atomic op in fifo_segment_update_free_bytes
136 fsh = clib_mem_alloc_aligned (sizeof (*fsh), sizeof (uword));
137 clib_memset (fsh, 0, sizeof (*fsh));
138 fs->h = sh->opaque[0] = fsh;
139 fs->n_slices = clib_max (fs->n_slices, 1);
141 fsh->ssvm_sh = fs->ssvm.sh;
142 fsh->n_slices = fs->n_slices;
143 max_fifo = clib_min ((fsh_free_space (fsh) - 4096) / 2,
144 FIFO_SEGMENT_MAX_FIFO_SIZE);
145 fsh->max_log2_chunk_size = max_log2 (max_fifo);
147 fsh->slices = clib_mem_alloc (sizeof (*fss) * fs->n_slices);
148 clib_memset (fsh->slices, 0, sizeof (*fss) * fs->n_slices);
149 max_chunk_sz = fsh->max_log2_chunk_size - FIFO_SEGMENT_MIN_LOG2_FIFO_SIZE;
151 for (i = 0; i < fs->n_slices; i++)
153 fss = fsh_slice_get (fsh, i);
154 vec_validate_init_empty (fss->free_chunks, max_chunk_sz, 0);
155 clib_spinlock_init (&fss->chunk_lock);
158 ssvm_pop_heap (oldheap);
160 fsh->n_free_bytes = fsh_free_space (fsh);
161 fsh->n_cached_bytes = 0;
162 fsh->n_reserved_bytes = clib_min (0.01 * fsh->n_free_bytes, 256 << 10);
168 * Create a fifo segment and initialize as master
171 fifo_segment_create (fifo_segment_main_t * sm, fifo_segment_create_args_t * a)
177 /* Allocate a fresh segment */
178 pool_get_zero (sm->segments, fs);
180 baseva = a->segment_type == SSVM_SEGMENT_PRIVATE ? ~0ULL : sm->next_baseva;
181 fs->ssvm.ssvm_size = a->segment_size;
182 fs->ssvm.i_am_master = 1;
183 fs->ssvm.my_pid = getpid ();
184 fs->ssvm.name = format (0, "%s%c", a->segment_name, 0);
185 fs->ssvm.requested_va = baseva;
187 if ((rv = ssvm_master_init (&fs->ssvm, a->segment_type)))
189 pool_put (sm->segments, fs);
193 /* Note: requested_va updated due to seg base addr randomization */
194 sm->next_baseva = fs->ssvm.sh->ssvm_va + fs->ssvm.ssvm_size;
196 fifo_segment_init (fs);
197 vec_add1 (a->new_segment_indices, fs - sm->segments);
202 * Attach as slave to a fifo segment
205 fifo_segment_attach (fifo_segment_main_t * sm, fifo_segment_create_args_t * a)
210 pool_get_zero (sm->segments, fs);
212 fs->ssvm.ssvm_size = a->segment_size;
213 fs->ssvm.my_pid = getpid ();
214 fs->ssvm.name = format (0, "%s%c", a->segment_name, 0);
215 fs->ssvm.requested_va = sm->next_baseva;
216 if (a->segment_type == SSVM_SEGMENT_MEMFD)
217 fs->ssvm.fd = a->memfd_fd;
219 fs->ssvm.attach_timeout = sm->timeout_in_seconds;
221 if ((rv = ssvm_slave_init (&fs->ssvm, a->segment_type)))
223 _vec_len (fs) = vec_len (fs) - 1;
227 /* Fish the segment header */
228 fs->h = fs->ssvm.sh->opaque[0];
230 vec_add1 (a->new_segment_indices, fs - sm->segments);
235 fifo_segment_delete (fifo_segment_main_t * sm, fifo_segment_t * s)
237 ssvm_delete (&s->ssvm);
238 clib_memset (s, 0xfe, sizeof (*s));
239 pool_put (sm->segments, s);
243 fifo_segment_index (fifo_segment_main_t * sm, fifo_segment_t * s)
245 return s - sm->segments;
249 fifo_segment_get_segment (fifo_segment_main_t * sm, u32 segment_index)
251 return pool_elt_at_index (sm->segments, segment_index);
255 fifo_segment_info (fifo_segment_t * seg, char **address, size_t * size)
257 *address = (char *) seg->ssvm.sh->ssvm_va;
258 *size = seg->ssvm.ssvm_size;
262 fifo_segment_main_init (fifo_segment_main_t * sm, u64 baseva,
263 u32 timeout_in_seconds)
265 sm->next_baseva = baseva;
266 sm->timeout_in_seconds = timeout_in_seconds;
270 fs_freelist_for_size (u32 size)
272 if (PREDICT_FALSE (size < FIFO_SEGMENT_MIN_FIFO_SIZE))
274 return max_log2 (size) - FIFO_SEGMENT_MIN_LOG2_FIFO_SIZE;
278 fs_freelist_index_to_size (u32 fl_index)
280 return 1 << (fl_index + FIFO_SEGMENT_MIN_LOG2_FIFO_SIZE);
284 fs_chunk_size_is_valid (fifo_segment_header_t * fsh, u32 size)
287 * 4K minimum. It's not likely that anything good will happen
288 * with a smaller FIFO.
290 return size >= FIFO_SEGMENT_MIN_FIFO_SIZE
291 && size <= (1 << fsh->max_log2_chunk_size);
295 fs_try_alloc_fifo_freelist (fifo_segment_slice_t * fss, u32 fl_index)
301 c = fss->free_chunks[fl_index];
306 fss->free_fifos = f->next;
307 fss->free_chunks[fl_index] = c->next;
310 memset (f, 0, sizeof (*f));
314 fss->n_fl_chunk_bytes -= fs_freelist_index_to_size (fl_index);
319 fs_try_alloc_multi_chunk (fifo_segment_header_t * fsh,
320 fifo_segment_slice_t * fss, u32 data_bytes)
322 u32 fl_index, fl_size, n_alloc = 0, req_bytes = data_bytes;
323 svm_fifo_chunk_t *c, *first = 0, *next;
325 fl_index = fs_freelist_for_size (req_bytes);
329 fl_size = fs_freelist_index_to_size (fl_index);
333 c = fss->free_chunks[fl_index];
336 fss->free_chunks[fl_index] = c->next;
340 req_bytes -= clib_min (fl_size, req_bytes);
344 /* Failed to allocate with smaller chunks */
347 /* free all chunks if any allocated */
351 fl_index = fs_freelist_for_size (c->length);
352 fl_size = fs_freelist_index_to_size (fl_index);
354 c->next = fss->free_chunks[fl_index];
355 fss->free_chunks[fl_index] = c;
356 fss->n_fl_chunk_bytes += fl_size;
361 fl_index = fs_freelist_for_size (data_bytes);
362 if (fss->free_chunks[fl_index + 1])
365 fl_size = fs_freelist_index_to_size (fl_index);
372 fl_size = fl_size >> 1;
376 fss->n_fl_chunk_bytes -= n_alloc;
377 fsh_cached_bytes_sub (fsh, n_alloc);
382 fs_try_alloc_fifo_freelist_multi_chunk (fifo_segment_header_t * fsh,
383 fifo_segment_slice_t * fss,
386 svm_fifo_chunk_t *c, *first = 0, *last = 0, *next;
387 u32 fl_index, fl_size, n_alloc = 0;
393 void *oldheap = ssvm_push_heap (fsh->ssvm_sh);
394 f = clib_mem_alloc_aligned (sizeof (*f), CLIB_CACHE_LINE_BYTES);
395 ssvm_pop_heap (oldheap);
398 memset (f, 0, sizeof (*f));
399 fsh_free_bytes_sub (fsh, sizeof (*f));
403 fss->free_fifos = f->next;
406 fl_index = fs_freelist_for_size (data_bytes);
410 fl_size = fs_freelist_index_to_size (fl_index);
414 c = fss->free_chunks[fl_index];
417 fss->free_chunks[fl_index] = c->next;
423 data_bytes -= clib_min (fl_size, data_bytes);
427 /* Failed to allocate with smaller chunks */
430 /* free all chunks if any allocated */
434 fl_index = fs_freelist_for_size (c->length);
435 fl_size = fs_freelist_index_to_size (fl_index);
437 c->next = fss->free_chunks[fl_index];
438 fss->free_chunks[fl_index] = c;
439 fss->n_fl_chunk_bytes += fl_size;
441 data_bytes += fl_size;
445 fl_index = fs_freelist_for_size (data_bytes);
446 if (fss->free_chunks[fl_index + 1])
449 fl_size = fs_freelist_index_to_size (fl_index);
453 f->next = fss->free_fifos;
458 fl_size = fl_size >> 1;
462 f->start_chunk = first;
464 fss->n_fl_chunk_bytes -= n_alloc;
465 fsh_cached_bytes_sub (fsh, n_alloc);
470 fsh_try_alloc_chunk_batch (fifo_segment_header_t * fsh,
471 fifo_segment_slice_t * fss,
472 u32 fl_index, u32 batch_size)
474 u32 rounded_data_size;
481 rounded_data_size = fs_freelist_index_to_size (fl_index);
482 size = (uword) (sizeof (*c) + rounded_data_size) * batch_size;
484 oldheap = ssvm_push_heap (fsh->ssvm_sh);
485 cmem = clib_mem_alloc_aligned_at_offset (size, CLIB_CACHE_LINE_BYTES,
486 0 /* align_offset */ ,
487 0 /* os_out_of_memory */ );
488 ssvm_pop_heap (oldheap);
494 /* Carve fifo + chunk space */
495 for (i = 0; i < batch_size; i++)
497 c = (svm_fifo_chunk_t *) cmem;
499 c->length = rounded_data_size;
500 c->enq_rb_index = RBTREE_TNIL_INDEX;
501 c->deq_rb_index = RBTREE_TNIL_INDEX;
502 c->next = fss->free_chunks[fl_index];
503 fss->free_chunks[fl_index] = c;
504 cmem += sizeof (*c) + rounded_data_size;
507 fss->n_fl_chunk_bytes += batch_size * rounded_data_size;
508 fsh_cached_bytes_add (fsh, batch_size * rounded_data_size);
509 fsh_free_bytes_sub (fsh, size);
515 fs_try_alloc_fifo_batch (fifo_segment_header_t * fsh,
516 fifo_segment_slice_t * fss,
517 u32 fl_index, u32 batch_size)
519 u32 hdrs, rounded_data_size;
527 rounded_data_size = fs_freelist_index_to_size (fl_index);
528 hdrs = sizeof (*f) + sizeof (*c);
529 size = (uword) (hdrs + rounded_data_size) * batch_size;
531 oldheap = ssvm_push_heap (fsh->ssvm_sh);
532 fmem = clib_mem_alloc_aligned_at_offset (size, CLIB_CACHE_LINE_BYTES,
533 0 /* align_offset */ ,
534 0 /* os_out_of_memory */ );
535 ssvm_pop_heap (oldheap);
541 /* Carve fifo + chunk space */
542 for (i = 0; i < batch_size; i++)
544 f = (svm_fifo_t *) fmem;
545 memset (f, 0, sizeof (*f));
546 f->next = fss->free_fifos;
548 c = (svm_fifo_chunk_t *) (fmem + sizeof (*f));
550 c->length = rounded_data_size;
551 c->enq_rb_index = RBTREE_TNIL_INDEX;
552 c->deq_rb_index = RBTREE_TNIL_INDEX;
553 c->next = fss->free_chunks[fl_index];
554 fss->free_chunks[fl_index] = c;
555 fmem += hdrs + rounded_data_size;
558 fss->n_fl_chunk_bytes += batch_size * rounded_data_size;
559 fsh_cached_bytes_add (fsh, batch_size * rounded_data_size);
560 fsh_free_bytes_sub (fsh, size);
566 * Try to allocate new fifo
568 * Tries the following steps in order:
569 * - grab fifo and chunk from freelists
570 * - batch fifo and chunk allocation
571 * - single fifo allocation
572 * - grab multiple fifo chunks from freelists
575 fs_try_alloc_fifo (fifo_segment_header_t * fsh, fifo_segment_slice_t * fss,
578 u32 fifo_sz, fl_index;
583 min_size = clib_max ((fsh->pct_first_alloc * data_bytes) / 100, 4096);
584 fl_index = fs_freelist_for_size (min_size);
585 fifo_sz = sizeof (svm_fifo_t) + sizeof (svm_fifo_chunk_t);
586 fifo_sz += 1 << max_log2 (min_size);
588 clib_spinlock_lock (&fss->chunk_lock);
590 if (fss->free_fifos && fss->free_chunks[fl_index])
592 f = fs_try_alloc_fifo_freelist (fss, fl_index);
595 fsh_cached_bytes_sub (fsh, fs_freelist_index_to_size (fl_index));
601 n_free_bytes = fsh_n_free_bytes (fsh);
602 if (fifo_sz * FIFO_SEGMENT_ALLOC_BATCH_SIZE < n_free_bytes)
604 if (fs_try_alloc_fifo_batch (fsh, fss, fl_index,
605 FIFO_SEGMENT_ALLOC_BATCH_SIZE))
608 f = fs_try_alloc_fifo_freelist (fss, fl_index);
610 fsh_cached_bytes_sub (fsh, fs_freelist_index_to_size (fl_index));
613 if (fifo_sz <= n_free_bytes)
615 void *oldheap = ssvm_push_heap (fsh->ssvm_sh);
616 f = svm_fifo_alloc (min_size);
617 ssvm_pop_heap (oldheap);
620 fsh_free_bytes_sub (fsh, fifo_sz);
624 /* All failed, try to allocate min of data bytes and fifo sz */
625 fifo_sz = clib_min (fifo_sz, data_bytes);
626 if (fifo_sz <= fss->n_fl_chunk_bytes)
627 f = fs_try_alloc_fifo_freelist_multi_chunk (fsh, fss, fifo_sz);
630 clib_spinlock_unlock (&fss->chunk_lock);
634 f->size = data_bytes;
641 fsh_alloc_chunk (fifo_segment_header_t * fsh, u32 slice_index, u32 chunk_size)
643 fifo_segment_slice_t *fss;
649 fl_index = fs_freelist_for_size (chunk_size);
650 fss = fsh_slice_get (fsh, slice_index);
652 clib_spinlock_lock (&fss->chunk_lock);
654 c = fss->free_chunks[fl_index];
658 fss->free_chunks[fl_index] = c->next;
660 fss->n_fl_chunk_bytes -= fs_freelist_index_to_size (fl_index);
661 fsh_cached_bytes_sub (fsh, fs_freelist_index_to_size (fl_index));
663 else if (chunk_size <= (n_free = fsh_n_free_bytes (fsh)))
667 chunk_size = fs_freelist_index_to_size (fl_index);
668 if (n_free < chunk_size)
671 oldheap = ssvm_push_heap (fsh->ssvm_sh);
672 c = svm_fifo_chunk_alloc (chunk_size);
673 ssvm_pop_heap (oldheap);
678 fsh_free_bytes_sub (fsh, chunk_size + sizeof (*c));
680 else if (chunk_size <= fss->n_fl_chunk_bytes)
682 c = fs_try_alloc_multi_chunk (fsh, fss, chunk_size);
684 else if (chunk_size <= fss->n_fl_chunk_bytes + n_free)
686 u32 min_size = FIFO_SEGMENT_MIN_FIFO_SIZE;
690 batch = (chunk_size - fss->n_fl_chunk_bytes) / min_size;
691 batch = clib_min (batch + 1, n_free / min_size);
692 if (!fsh_try_alloc_chunk_batch (fsh, fss, 0, batch))
693 c = fs_try_alloc_multi_chunk (fsh, fss, chunk_size);
698 clib_spinlock_unlock (&fss->chunk_lock);
704 fsh_slice_collect_chunks (fifo_segment_header_t * fsh,
705 fifo_segment_slice_t * fss, svm_fifo_chunk_t * c)
707 svm_fifo_chunk_t *next;
711 clib_spinlock_lock (&fss->chunk_lock);
716 fl_index = fs_freelist_for_size (c->length);
717 c->next = fss->free_chunks[fl_index];
718 c->enq_rb_index = RBTREE_TNIL_INDEX;
719 c->deq_rb_index = RBTREE_TNIL_INDEX;
720 fss->free_chunks[fl_index] = c;
721 n_collect += fs_freelist_index_to_size (fl_index);
725 fss->n_fl_chunk_bytes += n_collect;
726 fsh_cached_bytes_add (fsh, n_collect);
728 clib_spinlock_unlock (&fss->chunk_lock);
732 fsh_collect_chunks (fifo_segment_header_t * fsh, u32 slice_index,
733 svm_fifo_chunk_t * c)
735 fifo_segment_slice_t *fss;
736 fss = fsh_slice_get (fsh, slice_index);
737 fsh_slice_collect_chunks (fsh, fss, c);
741 * Allocate fifo in fifo segment
744 fifo_segment_alloc_fifo_w_slice (fifo_segment_t * fs, u32 slice_index,
745 u32 data_bytes, fifo_segment_ftype_t ftype)
747 fifo_segment_header_t *fsh = fs->h;
748 fifo_segment_slice_t *fss;
751 ASSERT (slice_index < fs->n_slices);
753 fss = fsh_slice_get (fsh, slice_index);
754 f = fs_try_alloc_fifo (fsh, fss, data_bytes);
758 f->slice_index = slice_index;
760 svm_fifo_init (f, data_bytes);
762 /* If rx fifo type add to active fifos list. When cleaning up segment,
763 * we need a list of active sessions that should be disconnected. Since
764 * both rx and tx fifos keep pointers to the session, it's enough to track
766 if (ftype == FIFO_SEGMENT_RX_FIFO)
770 fss->fifos->prev = f;
771 f->next = fss->fifos;
774 f->flags |= SVM_FIFO_F_LL_TRACKED;
776 svm_fifo_init_ooo_lookup (f, 0 /* ooo enq */ );
780 svm_fifo_init_ooo_lookup (f, 1 /* ooo deq */ );
783 fsh_active_fifos_update (fsh, 1);
790 * Free fifo allocated in fifo segment
793 fifo_segment_free_fifo (fifo_segment_t * fs, svm_fifo_t * f)
795 fifo_segment_header_t *fsh = fs->h;
796 fifo_segment_slice_t *fss;
798 ASSERT (f->refcnt > 0);
803 fss = fsh_slice_get (fsh, f->slice_index);
805 /* Remove from active list. Only rx fifos are tracked */
806 if (f->flags & SVM_FIFO_F_LL_TRACKED)
809 f->prev->next = f->next;
811 fss->fifos = f->next;
813 f->next->prev = f->prev;
814 f->flags &= ~SVM_FIFO_F_LL_TRACKED;
817 /* Add to free list */
818 f->next = fss->free_fifos;
822 /* Free fifo chunks */
823 fsh_slice_collect_chunks (fsh, fss, f->start_chunk);
825 f->start_chunk = f->end_chunk = 0;
826 f->head_chunk = f->tail_chunk = f->ooo_enq = f->ooo_deq = 0;
828 /* not allocated on segment heap */
829 svm_fifo_free_chunk_lookup (f);
830 svm_fifo_free_ooo_data (f);
834 f->master_session_index = ~0;
835 f->master_thread_index = ~0;
838 fsh_active_fifos_update (fsh, -1);
842 fifo_segment_prealloc_fifo_hdrs (fifo_segment_t * fs, u32 slice_index,
845 fifo_segment_header_t *fsh = fs->h;
846 fifo_segment_slice_t *fss;
853 fss = fsh_slice_get (fsh, slice_index);
854 size = (uword) (sizeof (*f)) * batch_size;
856 oldheap = ssvm_push_heap (fsh->ssvm_sh);
857 fmem = clib_mem_alloc_aligned_at_offset (size, CLIB_CACHE_LINE_BYTES,
858 0 /* align_offset */ ,
859 0 /* os_out_of_memory */ );
860 ssvm_pop_heap (oldheap);
866 /* Carve fifo + chunk space */
867 for (i = 0; i < batch_size; i++)
869 f = (svm_fifo_t *) fmem;
870 memset (f, 0, sizeof (*f));
871 f->next = fss->free_fifos;
876 fsh_free_bytes_sub (fsh, size);
882 fifo_segment_prealloc_fifo_chunks (fifo_segment_t * fs, u32 slice_index,
883 u32 chunk_size, u32 batch_size)
885 fifo_segment_header_t *fsh = fs->h;
886 u32 rounded_data_size, fl_index;
887 fifo_segment_slice_t *fss;
894 if (!fs_chunk_size_is_valid (fsh, chunk_size))
896 clib_warning ("chunk size out of range %d", chunk_size);
900 fl_index = fs_freelist_for_size (chunk_size);
901 rounded_data_size = fs_freelist_index_to_size (fl_index);
902 size = (uword) (sizeof (*c) + rounded_data_size) * batch_size;
904 oldheap = ssvm_push_heap (fsh->ssvm_sh);
905 cmem = clib_mem_alloc_aligned_at_offset (size, CLIB_CACHE_LINE_BYTES,
906 0 /* align_offset */ ,
907 0 /* os_out_of_memory */ );
908 ssvm_pop_heap (oldheap);
914 fss = fsh_slice_get (fsh, slice_index);
916 /* Carve fifo + chunk space */
917 for (i = 0; i < batch_size; i++)
919 c = (svm_fifo_chunk_t *) cmem;
921 c->length = rounded_data_size;
922 c->next = fss->free_chunks[fl_index];
923 fss->free_chunks[fl_index] = c;
924 cmem += sizeof (*c) + rounded_data_size;
925 fsh_cached_bytes_add (fsh, rounded_data_size);
928 fss->n_fl_chunk_bytes += batch_size * rounded_data_size;
929 fsh_free_bytes_sub (fsh, size);
935 * Pre-allocates fifo pairs in fifo segment
938 fifo_segment_preallocate_fifo_pairs (fifo_segment_t * fs,
939 u32 rx_fifo_size, u32 tx_fifo_size,
942 u32 rx_rounded_data_size, tx_rounded_data_size, pair_size, pairs_to_alloc;
943 u32 hdrs, pairs_per_slice, alloc_now;
944 fifo_segment_header_t *fsh = fs->h;
945 int rx_fl_index, tx_fl_index, i;
946 fifo_segment_slice_t *fss;
947 uword space_available;
949 /* Parameter check */
950 if (rx_fifo_size == 0 || tx_fifo_size == 0 || *n_fifo_pairs == 0)
953 if (!fs_chunk_size_is_valid (fsh, rx_fifo_size))
955 clib_warning ("rx fifo_size out of range %d", rx_fifo_size);
959 if (!fs_chunk_size_is_valid (fsh, tx_fifo_size))
961 clib_warning ("tx fifo_size out of range %d", tx_fifo_size);
965 rx_rounded_data_size = (1 << (max_log2 (rx_fifo_size)));
966 rx_fl_index = fs_freelist_for_size (rx_fifo_size);
967 tx_rounded_data_size = (1 << (max_log2 (tx_fifo_size)));
968 tx_fl_index = fs_freelist_for_size (tx_fifo_size);
970 hdrs = sizeof (svm_fifo_t) + sizeof (svm_fifo_chunk_t);
972 /* Calculate space requirements */
973 pair_size = 2 * hdrs + rx_rounded_data_size + tx_rounded_data_size;
974 space_available = fsh_free_space (fsh);
975 pairs_to_alloc = space_available / pair_size;
976 pairs_to_alloc = clib_min (pairs_to_alloc, *n_fifo_pairs);
977 pairs_per_slice = pairs_to_alloc / fs->n_slices;
978 pairs_per_slice += pairs_to_alloc % fs->n_slices ? 1 : 0;
980 if (!pairs_per_slice)
983 for (i = 0; i < fs->n_slices; i++)
985 fss = fsh_slice_get (fsh, i);
986 alloc_now = clib_min (pairs_per_slice, *n_fifo_pairs);
987 if (fs_try_alloc_fifo_batch (fsh, fss, rx_fl_index, alloc_now))
988 clib_warning ("rx prealloc failed: pairs %u", alloc_now);
989 if (fs_try_alloc_fifo_batch (fsh, fss, tx_fl_index, alloc_now))
990 clib_warning ("tx prealloc failed: pairs %u", alloc_now);
992 /* Account for the pairs allocated */
993 *n_fifo_pairs -= alloc_now;
998 * Get number of active fifos
1001 fifo_segment_num_fifos (fifo_segment_t * fs)
1003 return clib_atomic_load_relax_n (&fs->h->n_active_fifos);
1007 fs_slice_num_free_fifos (fifo_segment_slice_t * fss)
1012 f = fss->free_fifos;
1025 fifo_segment_num_free_fifos (fifo_segment_t * fs)
1027 fifo_segment_header_t *fsh = fs->h;
1028 fifo_segment_slice_t *fss;
1032 for (slice_index = 0; slice_index < fs->n_slices; slice_index++)
1034 fss = fsh_slice_get (fsh, slice_index);
1035 count += fs_slice_num_free_fifos (fss);
1041 fs_slice_num_free_chunks (fifo_segment_slice_t * fss, u32 size)
1043 u32 count = 0, rounded_size, fl_index;
1044 svm_fifo_chunk_t *c;
1047 /* Count all free chunks? */
1050 for (i = 0; i < vec_len (fss->free_chunks); i++)
1052 c = fss->free_chunks[i];
1065 rounded_size = (1 << (max_log2 (size)));
1066 fl_index = fs_freelist_for_size (rounded_size);
1068 if (fl_index >= vec_len (fss->free_chunks))
1071 c = fss->free_chunks[fl_index];
1084 fifo_segment_num_free_chunks (fifo_segment_t * fs, u32 size)
1086 fifo_segment_header_t *fsh = fs->h;
1087 fifo_segment_slice_t *fss;
1091 for (slice_index = 0; slice_index < fs->n_slices; slice_index++)
1093 fss = fsh_slice_get (fsh, slice_index);
1094 count += fs_slice_num_free_chunks (fss, size);
1100 fifo_segment_update_free_bytes (fifo_segment_t * fs)
1102 fsh_update_free_bytes (fs->h);
1106 fifo_segment_size (fifo_segment_t * fs)
1108 return fs->ssvm.ssvm_size;
1112 fsh_has_reached_mem_limit (fifo_segment_header_t * fsh)
1114 return (fsh->flags & FIFO_SEGMENT_F_MEM_LIMIT) ? 1 : 0;
1118 fsh_reset_mem_limit (fifo_segment_header_t * fsh)
1120 fsh->flags &= ~FIFO_SEGMENT_F_MEM_LIMIT;
1124 fifo_segment_free_bytes (fifo_segment_t * fs)
1126 return fsh_n_free_bytes (fs->h);
1130 fifo_segment_cached_bytes (fifo_segment_t * fs)
1132 return fsh_n_cached_bytes (fs->h);
1136 fifo_segment_available_bytes (fifo_segment_t * fs)
1138 return fsh_n_free_bytes (fs->h) + fsh_n_cached_bytes (fs->h);
1142 fifo_segment_fl_chunk_bytes (fifo_segment_t * fs)
1144 fifo_segment_header_t *fsh = fs->h;
1145 fifo_segment_slice_t *fss;
1149 for (slice_index = 0; slice_index < fs->n_slices; slice_index++)
1151 fss = fsh_slice_get (fsh, slice_index);
1152 n_bytes += fss->n_fl_chunk_bytes;
1159 fifo_segment_has_fifos (fifo_segment_t * fs)
1161 fifo_segment_header_t *fsh = fs->h;
1162 fifo_segment_slice_t *fss;
1165 for (slice_index = 0; slice_index < fs->n_slices; slice_index++)
1167 fss = fsh_slice_get (fsh, slice_index);
1175 fifo_segment_get_slice_fifo_list (fifo_segment_t * fs, u32 slice_index)
1177 fifo_segment_header_t *fsh = fs->h;
1178 fifo_segment_slice_t *fss;
1180 fss = fsh_slice_get (fsh, slice_index);
1185 fifo_segment_get_mem_usage (fifo_segment_t * fs)
1189 size = fifo_segment_size (fs);
1191 size - fifo_segment_free_bytes (fs) - fifo_segment_cached_bytes (fs);
1192 return (in_use * 100) / size;
1195 fifo_segment_mem_status_t
1196 fifo_segment_determine_status (fifo_segment_header_t * fsh, u8 usage)
1198 if (!fsh->high_watermark || !fsh->low_watermark)
1199 return MEMORY_PRESSURE_NO_PRESSURE;
1201 /* once the no-memory is detected, the status continues
1202 * until memory usage gets below the high watermark
1204 if (fsh_has_reached_mem_limit (fsh))
1206 if (usage >= fsh->high_watermark)
1207 return MEMORY_PRESSURE_NO_MEMORY;
1209 fsh_reset_mem_limit (fsh);
1212 if (usage >= fsh->high_watermark)
1213 return MEMORY_PRESSURE_HIGH_PRESSURE;
1215 else if (usage >= fsh->low_watermark)
1216 return MEMORY_PRESSURE_LOW_PRESSURE;
1218 return MEMORY_PRESSURE_NO_PRESSURE;
1221 fifo_segment_mem_status_t
1222 fifo_segment_get_mem_status (fifo_segment_t * fs)
1224 fifo_segment_header_t *fsh = fs->h;
1225 u8 usage = fifo_segment_get_mem_usage (fs);
1227 return fifo_segment_determine_status (fsh, usage);
1231 format_fifo_segment_type (u8 * s, va_list * args)
1234 sp = va_arg (*args, fifo_segment_t *);
1235 ssvm_segment_type_t st = ssvm_type (&sp->ssvm);
1237 if (st == SSVM_SEGMENT_PRIVATE)
1238 s = format (s, "%s", "private-heap");
1239 else if (st == SSVM_SEGMENT_MEMFD)
1240 s = format (s, "%s", "memfd");
1241 else if (st == SSVM_SEGMENT_SHM)
1242 s = format (s, "%s", "shm");
1244 s = format (s, "%s", "unknown");
1249 * Segment format function
1252 format_fifo_segment (u8 * s, va_list * args)
1254 u32 count, indent, active_fifos, free_fifos, fifo_hdr = 0;
1255 fifo_segment_t *fs = va_arg (*args, fifo_segment_t *);
1256 int verbose __attribute__ ((unused)) = va_arg (*args, int);
1257 uword est_chunk_bytes, est_free_seg_bytes, free_chunks;
1258 uword chunk_bytes = 0, free_seg_bytes, chunk_size;
1259 uword tracked_cached_bytes;
1260 fifo_segment_header_t *fsh;
1261 fifo_segment_slice_t *fss;
1262 svm_fifo_chunk_t *c;
1267 uword allocated, in_use;
1269 fifo_segment_mem_status_t mem_st;
1271 indent = format_get_indent (s) + 2;
1275 s = format (s, "%-15s%15s%15s%15s%15s%15s", "Name", "Type",
1276 "HeapSize (M)", "ActiveFifos", "FreeFifos", "Address");
1280 fifo_segment_info (fs, &address, &size);
1281 active_fifos = fifo_segment_num_fifos (fs);
1282 free_fifos = fifo_segment_num_free_fifos (fs);
1284 s = format (s, "%-15v%15U%15llu%15u%15u%15llx", ssvm_name (&fs->ssvm),
1285 format_fifo_segment_type, fs, size >> 20ULL, active_fifos,
1286 free_fifos, address);
1293 free_chunks = fifo_segment_num_free_chunks (fs, ~0);
1295 s = format (s, "\n\n%UFree chunks by size:\n", format_white_space,
1298 s = format (s, "\n");
1300 for (slice_index = 0; slice_index < fs->n_slices; slice_index++)
1302 fss = fsh_slice_get (fsh, slice_index);
1303 for (i = 0; i < vec_len (fss->free_chunks); i++)
1305 c = fss->free_chunks[i];
1315 chunk_size = fs_freelist_index_to_size (i);
1316 s = format (s, "%U%-5u kB: %u\n", format_white_space, indent + 2,
1317 chunk_size >> 10, count);
1319 chunk_bytes += count * chunk_size;
1323 fifo_hdr = free_fifos * sizeof (svm_fifo_t);
1324 est_chunk_bytes = fifo_segment_fl_chunk_bytes (fs);
1325 est_free_seg_bytes = fifo_segment_free_bytes (fs);
1326 fifo_segment_update_free_bytes (fs);
1327 free_seg_bytes = fifo_segment_free_bytes (fs);
1328 tracked_cached_bytes = fifo_segment_cached_bytes (fs);
1329 allocated = fifo_segment_size (fs);
1330 in_use = fifo_segment_size (fs) - est_free_seg_bytes - tracked_cached_bytes;
1331 usage = (100.0 * in_use) / allocated;
1332 mem_st = fifo_segment_get_mem_status (fs);
1334 s = format (s, "\n%Useg free bytes: %U (%lu) estimated: %U (%lu)\n",
1335 format_white_space, indent + 2, format_memory_size,
1336 free_seg_bytes, free_seg_bytes, format_memory_size,
1337 est_free_seg_bytes, est_free_seg_bytes);
1340 "%Uchunk free bytes: %U (%lu) estimated: %U (%lu) tracked: %U (%lu)\n",
1341 format_white_space, indent + 2, format_memory_size, chunk_bytes,
1342 chunk_bytes, format_memory_size, est_chunk_bytes, est_chunk_bytes,
1343 format_memory_size, tracked_cached_bytes, tracked_cached_bytes);
1345 format (s, "%Ufifo hdr free bytes: %U (%u) reserved %U (%lu)\n",
1346 format_white_space, indent + 2, format_memory_size, fifo_hdr,
1347 fifo_hdr, format_memory_size, fsh->n_reserved_bytes,
1348 fsh->n_reserved_bytes);
1350 format (s, "%Usegment usage: %.2f%% (%U / %U) %s\n", format_white_space,
1351 indent + 2, usage, format_memory_size, in_use, format_memory_size,
1352 allocated, fifo_segment_mem_status_strings[mem_st]);
1353 s = format (s, "\n");
1359 * fd.io coding-style-patch-verification: ON
1362 * eval: (c-set-style "gnu")