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;
119 u32 max_chunk_sz, max_chunks;
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 max_chunks = fsh->n_free_bytes / FIFO_SEGMENT_MIN_FIFO_SIZE;
163 fsh->n_reserved_bytes = (max_chunks / 4) * sizeof (rb_node_t);
169 * Create a fifo segment and initialize as master
172 fifo_segment_create (fifo_segment_main_t * sm, fifo_segment_create_args_t * a)
178 /* Allocate a fresh segment */
179 pool_get_zero (sm->segments, fs);
181 baseva = a->segment_type == SSVM_SEGMENT_PRIVATE ? ~0ULL : sm->next_baseva;
182 fs->ssvm.ssvm_size = a->segment_size;
183 fs->ssvm.i_am_master = 1;
184 fs->ssvm.my_pid = getpid ();
185 fs->ssvm.name = format (0, "%s%c", a->segment_name, 0);
186 fs->ssvm.requested_va = baseva;
188 if ((rv = ssvm_master_init (&fs->ssvm, a->segment_type)))
190 pool_put (sm->segments, fs);
194 /* Note: requested_va updated due to seg base addr randomization */
195 sm->next_baseva = fs->ssvm.sh->ssvm_va + fs->ssvm.ssvm_size;
197 fifo_segment_init (fs);
198 vec_add1 (a->new_segment_indices, fs - sm->segments);
203 * Attach as slave to a fifo segment
206 fifo_segment_attach (fifo_segment_main_t * sm, fifo_segment_create_args_t * a)
211 pool_get_zero (sm->segments, fs);
213 fs->ssvm.ssvm_size = a->segment_size;
214 fs->ssvm.my_pid = getpid ();
215 fs->ssvm.name = format (0, "%s%c", a->segment_name, 0);
216 fs->ssvm.requested_va = sm->next_baseva;
217 if (a->segment_type == SSVM_SEGMENT_MEMFD)
218 fs->ssvm.fd = a->memfd_fd;
220 fs->ssvm.attach_timeout = sm->timeout_in_seconds;
222 if ((rv = ssvm_slave_init (&fs->ssvm, a->segment_type)))
224 _vec_len (fs) = vec_len (fs) - 1;
228 /* Fish the segment header */
229 fs->h = fs->ssvm.sh->opaque[0];
231 vec_add1 (a->new_segment_indices, fs - sm->segments);
236 fifo_segment_delete (fifo_segment_main_t * sm, fifo_segment_t * s)
238 ssvm_delete (&s->ssvm);
239 clib_memset (s, 0xfe, sizeof (*s));
240 pool_put (sm->segments, s);
244 fifo_segment_index (fifo_segment_main_t * sm, fifo_segment_t * s)
246 return s - sm->segments;
250 fifo_segment_get_segment (fifo_segment_main_t * sm, u32 segment_index)
252 return pool_elt_at_index (sm->segments, segment_index);
256 fifo_segment_info (fifo_segment_t * seg, char **address, size_t * size)
258 *address = (char *) seg->ssvm.sh->ssvm_va;
259 *size = seg->ssvm.ssvm_size;
263 fifo_segment_main_init (fifo_segment_main_t * sm, u64 baseva,
264 u32 timeout_in_seconds)
266 sm->next_baseva = baseva;
267 sm->timeout_in_seconds = timeout_in_seconds;
271 fs_freelist_for_size (u32 size)
273 if (PREDICT_FALSE (size < FIFO_SEGMENT_MIN_FIFO_SIZE))
275 return max_log2 (size) - FIFO_SEGMENT_MIN_LOG2_FIFO_SIZE;
279 fs_freelist_index_to_size (u32 fl_index)
281 return 1 << (fl_index + FIFO_SEGMENT_MIN_LOG2_FIFO_SIZE);
285 fs_chunk_size_is_valid (fifo_segment_header_t * fsh, u32 size)
288 * 4K minimum. It's not likely that anything good will happen
289 * with a smaller FIFO.
291 return size >= FIFO_SEGMENT_MIN_FIFO_SIZE
292 && size <= (1 << fsh->max_log2_chunk_size);
296 fs_try_alloc_fifo_freelist (fifo_segment_slice_t * fss, u32 fl_index)
302 c = fss->free_chunks[fl_index];
307 fss->free_fifos = f->next;
308 fss->free_chunks[fl_index] = c->next;
311 memset (f, 0, sizeof (*f));
315 fss->n_fl_chunk_bytes -= fs_freelist_index_to_size (fl_index);
320 fs_try_alloc_multi_chunk (fifo_segment_header_t * fsh,
321 fifo_segment_slice_t * fss, u32 data_bytes)
323 u32 fl_index, fl_size, n_alloc = 0, req_bytes = data_bytes;
324 svm_fifo_chunk_t *c, *first = 0, *next;
326 fl_index = fs_freelist_for_size (req_bytes);
330 fl_size = fs_freelist_index_to_size (fl_index);
334 c = fss->free_chunks[fl_index];
337 fss->free_chunks[fl_index] = c->next;
341 req_bytes -= clib_min (fl_size, req_bytes);
345 /* Failed to allocate with smaller chunks */
348 /* free all chunks if any allocated */
352 fl_index = fs_freelist_for_size (c->length);
353 fl_size = fs_freelist_index_to_size (fl_index);
355 c->next = fss->free_chunks[fl_index];
356 fss->free_chunks[fl_index] = c;
357 fss->n_fl_chunk_bytes += fl_size;
362 fl_index = fs_freelist_for_size (data_bytes);
363 if (fss->free_chunks[fl_index + 1])
366 fl_size = fs_freelist_index_to_size (fl_index);
373 fl_size = fl_size >> 1;
377 fss->n_fl_chunk_bytes -= n_alloc;
378 fsh_cached_bytes_sub (fsh, n_alloc);
383 fs_try_alloc_fifo_freelist_multi_chunk (fifo_segment_header_t * fsh,
384 fifo_segment_slice_t * fss,
387 svm_fifo_chunk_t *c, *first = 0, *last = 0, *next;
388 u32 fl_index, fl_size, n_alloc = 0;
394 void *oldheap = ssvm_push_heap (fsh->ssvm_sh);
395 f = clib_mem_alloc_aligned (sizeof (*f), CLIB_CACHE_LINE_BYTES);
396 ssvm_pop_heap (oldheap);
399 memset (f, 0, sizeof (*f));
400 fsh_free_bytes_sub (fsh, sizeof (*f));
404 fss->free_fifos = f->next;
407 fl_index = fs_freelist_for_size (data_bytes);
411 fl_size = fs_freelist_index_to_size (fl_index);
415 c = fss->free_chunks[fl_index];
418 fss->free_chunks[fl_index] = c->next;
424 data_bytes -= clib_min (fl_size, data_bytes);
428 /* Failed to allocate with smaller chunks */
431 /* free all chunks if any allocated */
435 fl_index = fs_freelist_for_size (c->length);
436 fl_size = fs_freelist_index_to_size (fl_index);
438 c->next = fss->free_chunks[fl_index];
439 fss->free_chunks[fl_index] = c;
440 fss->n_fl_chunk_bytes += fl_size;
442 data_bytes += fl_size;
446 fl_index = fs_freelist_for_size (data_bytes);
447 if (fss->free_chunks[fl_index + 1])
450 fl_size = fs_freelist_index_to_size (fl_index);
454 f->next = fss->free_fifos;
459 fl_size = fl_size >> 1;
463 f->start_chunk = first;
465 fss->n_fl_chunk_bytes -= n_alloc;
466 fsh_cached_bytes_sub (fsh, n_alloc);
471 fsh_try_alloc_chunk_batch (fifo_segment_header_t * fsh,
472 fifo_segment_slice_t * fss,
473 u32 fl_index, u32 batch_size)
475 u32 rounded_data_size;
482 rounded_data_size = fs_freelist_index_to_size (fl_index);
483 size = (uword) (sizeof (*c) + rounded_data_size) * batch_size;
485 oldheap = ssvm_push_heap (fsh->ssvm_sh);
486 cmem = clib_mem_alloc_aligned_at_offset (size, CLIB_CACHE_LINE_BYTES,
487 0 /* align_offset */ ,
488 0 /* os_out_of_memory */ );
489 ssvm_pop_heap (oldheap);
495 /* Carve fifo + chunk space */
496 for (i = 0; i < batch_size; i++)
498 c = (svm_fifo_chunk_t *) cmem;
500 c->length = rounded_data_size;
501 c->enq_rb_index = RBTREE_TNIL_INDEX;
502 c->deq_rb_index = RBTREE_TNIL_INDEX;
503 c->next = fss->free_chunks[fl_index];
504 fss->free_chunks[fl_index] = c;
505 cmem += sizeof (*c) + rounded_data_size;
508 fss->n_fl_chunk_bytes += batch_size * rounded_data_size;
509 fsh_cached_bytes_add (fsh, batch_size * rounded_data_size);
510 fsh_free_bytes_sub (fsh, size);
516 fs_try_alloc_fifo_batch (fifo_segment_header_t * fsh,
517 fifo_segment_slice_t * fss,
518 u32 fl_index, u32 batch_size)
520 u32 hdrs, rounded_data_size;
528 rounded_data_size = fs_freelist_index_to_size (fl_index);
529 hdrs = sizeof (*f) + sizeof (*c);
530 size = (uword) (hdrs + rounded_data_size) * batch_size;
532 oldheap = ssvm_push_heap (fsh->ssvm_sh);
533 fmem = clib_mem_alloc_aligned_at_offset (size, CLIB_CACHE_LINE_BYTES,
534 0 /* align_offset */ ,
535 0 /* os_out_of_memory */ );
536 ssvm_pop_heap (oldheap);
542 /* Carve fifo + chunk space */
543 for (i = 0; i < batch_size; i++)
545 f = (svm_fifo_t *) fmem;
546 memset (f, 0, sizeof (*f));
547 f->next = fss->free_fifos;
549 c = (svm_fifo_chunk_t *) (fmem + sizeof (*f));
551 c->length = rounded_data_size;
552 c->enq_rb_index = RBTREE_TNIL_INDEX;
553 c->deq_rb_index = RBTREE_TNIL_INDEX;
554 c->next = fss->free_chunks[fl_index];
555 fss->free_chunks[fl_index] = c;
556 fmem += hdrs + rounded_data_size;
559 fss->n_fl_chunk_bytes += batch_size * rounded_data_size;
560 fsh_cached_bytes_add (fsh, batch_size * rounded_data_size);
561 fsh_free_bytes_sub (fsh, size);
567 * Try to allocate new fifo
569 * Tries the following steps in order:
570 * - grab fifo and chunk from freelists
571 * - batch fifo and chunk allocation
572 * - single fifo allocation
573 * - grab multiple fifo chunks from freelists
576 fs_try_alloc_fifo (fifo_segment_header_t * fsh, fifo_segment_slice_t * fss,
579 u32 fifo_sz, fl_index;
584 min_size = clib_max ((fsh->pct_first_alloc * data_bytes) / 100, 4096);
585 fl_index = fs_freelist_for_size (min_size);
586 fifo_sz = sizeof (svm_fifo_t) + sizeof (svm_fifo_chunk_t);
587 fifo_sz += 1 << max_log2 (min_size);
589 clib_spinlock_lock (&fss->chunk_lock);
591 if (fss->free_fifos && fss->free_chunks[fl_index])
593 f = fs_try_alloc_fifo_freelist (fss, fl_index);
596 fsh_cached_bytes_sub (fsh, fs_freelist_index_to_size (fl_index));
602 n_free_bytes = fsh_n_free_bytes (fsh);
603 if (fifo_sz * FIFO_SEGMENT_ALLOC_BATCH_SIZE < n_free_bytes)
605 if (fs_try_alloc_fifo_batch (fsh, fss, fl_index,
606 FIFO_SEGMENT_ALLOC_BATCH_SIZE))
609 f = fs_try_alloc_fifo_freelist (fss, fl_index);
611 fsh_cached_bytes_sub (fsh, fs_freelist_index_to_size (fl_index));
614 if (fifo_sz <= n_free_bytes)
616 void *oldheap = ssvm_push_heap (fsh->ssvm_sh);
617 f = svm_fifo_alloc (min_size);
618 ssvm_pop_heap (oldheap);
621 fsh_free_bytes_sub (fsh, fifo_sz);
625 /* All failed, try to allocate min of data bytes and fifo sz */
626 fifo_sz = clib_min (fifo_sz, data_bytes);
627 if (fifo_sz <= fss->n_fl_chunk_bytes)
628 f = fs_try_alloc_fifo_freelist_multi_chunk (fsh, fss, fifo_sz);
631 clib_spinlock_unlock (&fss->chunk_lock);
635 f->size = data_bytes;
642 fsh_alloc_chunk (fifo_segment_header_t * fsh, u32 slice_index, u32 chunk_size)
644 fifo_segment_slice_t *fss;
650 fl_index = fs_freelist_for_size (chunk_size);
651 fss = fsh_slice_get (fsh, slice_index);
653 clib_spinlock_lock (&fss->chunk_lock);
655 c = fss->free_chunks[fl_index];
659 fss->free_chunks[fl_index] = c->next;
661 fss->n_fl_chunk_bytes -= fs_freelist_index_to_size (fl_index);
662 fsh_cached_bytes_sub (fsh, fs_freelist_index_to_size (fl_index));
664 else if (chunk_size <= (n_free = fsh_n_free_bytes (fsh)))
668 chunk_size = fs_freelist_index_to_size (fl_index);
669 if (n_free < chunk_size)
672 oldheap = ssvm_push_heap (fsh->ssvm_sh);
673 c = svm_fifo_chunk_alloc (chunk_size);
674 ssvm_pop_heap (oldheap);
679 fsh_free_bytes_sub (fsh, chunk_size + sizeof (*c));
681 else if (chunk_size <= fss->n_fl_chunk_bytes)
683 c = fs_try_alloc_multi_chunk (fsh, fss, chunk_size);
685 else if (chunk_size <= fss->n_fl_chunk_bytes + n_free)
687 u32 min_size = FIFO_SEGMENT_MIN_FIFO_SIZE;
691 batch = (chunk_size - fss->n_fl_chunk_bytes) / min_size;
692 batch = clib_min (batch + 1, n_free / min_size);
693 if (!fsh_try_alloc_chunk_batch (fsh, fss, 0, batch))
694 c = fs_try_alloc_multi_chunk (fsh, fss, chunk_size);
699 clib_spinlock_unlock (&fss->chunk_lock);
705 fsh_slice_collect_chunks (fifo_segment_header_t * fsh,
706 fifo_segment_slice_t * fss, svm_fifo_chunk_t * c)
708 svm_fifo_chunk_t *next;
712 clib_spinlock_lock (&fss->chunk_lock);
717 fl_index = fs_freelist_for_size (c->length);
718 c->next = fss->free_chunks[fl_index];
719 c->enq_rb_index = RBTREE_TNIL_INDEX;
720 c->deq_rb_index = RBTREE_TNIL_INDEX;
721 fss->free_chunks[fl_index] = c;
722 n_collect += fs_freelist_index_to_size (fl_index);
726 fss->n_fl_chunk_bytes += n_collect;
727 fsh_cached_bytes_add (fsh, n_collect);
729 clib_spinlock_unlock (&fss->chunk_lock);
733 fsh_collect_chunks (fifo_segment_header_t * fsh, u32 slice_index,
734 svm_fifo_chunk_t * c)
736 fifo_segment_slice_t *fss;
737 fss = fsh_slice_get (fsh, slice_index);
738 fsh_slice_collect_chunks (fsh, fss, c);
742 * Allocate fifo in fifo segment
745 fifo_segment_alloc_fifo_w_slice (fifo_segment_t * fs, u32 slice_index,
746 u32 data_bytes, fifo_segment_ftype_t ftype)
748 fifo_segment_header_t *fsh = fs->h;
749 fifo_segment_slice_t *fss;
752 ASSERT (slice_index < fs->n_slices);
754 fss = fsh_slice_get (fsh, slice_index);
755 f = fs_try_alloc_fifo (fsh, fss, data_bytes);
759 f->slice_index = slice_index;
761 svm_fifo_init (f, data_bytes);
763 /* If rx fifo type add to active fifos list. When cleaning up segment,
764 * we need a list of active sessions that should be disconnected. Since
765 * both rx and tx fifos keep pointers to the session, it's enough to track
767 if (ftype == FIFO_SEGMENT_RX_FIFO)
771 fss->fifos->prev = f;
772 f->next = fss->fifos;
775 f->flags |= SVM_FIFO_F_LL_TRACKED;
777 svm_fifo_init_ooo_lookup (f, 0 /* ooo enq */ );
781 svm_fifo_init_ooo_lookup (f, 1 /* ooo deq */ );
784 fsh_active_fifos_update (fsh, 1);
791 * Free fifo allocated in fifo segment
794 fifo_segment_free_fifo (fifo_segment_t * fs, svm_fifo_t * f)
796 fifo_segment_header_t *fsh = fs->h;
797 fifo_segment_slice_t *fss;
799 ASSERT (f->refcnt > 0);
804 fss = fsh_slice_get (fsh, f->slice_index);
806 /* Remove from active list. Only rx fifos are tracked */
807 if (f->flags & SVM_FIFO_F_LL_TRACKED)
810 f->prev->next = f->next;
812 fss->fifos = f->next;
814 f->next->prev = f->prev;
815 f->flags &= ~SVM_FIFO_F_LL_TRACKED;
818 /* Add to free list */
819 f->next = fss->free_fifos;
823 /* Free fifo chunks */
824 fsh_slice_collect_chunks (fsh, fss, f->start_chunk);
826 f->start_chunk = f->end_chunk = 0;
827 f->head_chunk = f->tail_chunk = f->ooo_enq = f->ooo_deq = 0;
829 /* not allocated on segment heap */
830 svm_fifo_free_chunk_lookup (f);
831 svm_fifo_free_ooo_data (f);
835 f->master_session_index = ~0;
836 f->master_thread_index = ~0;
839 fsh_active_fifos_update (fsh, -1);
843 fifo_segment_prealloc_fifo_hdrs (fifo_segment_t * fs, u32 slice_index,
846 fifo_segment_header_t *fsh = fs->h;
847 fifo_segment_slice_t *fss;
854 fss = fsh_slice_get (fsh, slice_index);
855 size = (uword) (sizeof (*f)) * batch_size;
857 oldheap = ssvm_push_heap (fsh->ssvm_sh);
858 fmem = clib_mem_alloc_aligned_at_offset (size, CLIB_CACHE_LINE_BYTES,
859 0 /* align_offset */ ,
860 0 /* os_out_of_memory */ );
861 ssvm_pop_heap (oldheap);
867 /* Carve fifo + chunk space */
868 for (i = 0; i < batch_size; i++)
870 f = (svm_fifo_t *) fmem;
871 memset (f, 0, sizeof (*f));
872 f->next = fss->free_fifos;
877 fsh_free_bytes_sub (fsh, size);
883 fifo_segment_prealloc_fifo_chunks (fifo_segment_t * fs, u32 slice_index,
884 u32 chunk_size, u32 batch_size)
886 fifo_segment_header_t *fsh = fs->h;
887 u32 rounded_data_size, fl_index;
888 fifo_segment_slice_t *fss;
895 if (!fs_chunk_size_is_valid (fsh, chunk_size))
897 clib_warning ("chunk size out of range %d", chunk_size);
901 fl_index = fs_freelist_for_size (chunk_size);
902 rounded_data_size = fs_freelist_index_to_size (fl_index);
903 size = (uword) (sizeof (*c) + rounded_data_size) * batch_size;
905 oldheap = ssvm_push_heap (fsh->ssvm_sh);
906 cmem = clib_mem_alloc_aligned_at_offset (size, CLIB_CACHE_LINE_BYTES,
907 0 /* align_offset */ ,
908 0 /* os_out_of_memory */ );
909 ssvm_pop_heap (oldheap);
915 fss = fsh_slice_get (fsh, slice_index);
917 /* Carve fifo + chunk space */
918 for (i = 0; i < batch_size; i++)
920 c = (svm_fifo_chunk_t *) cmem;
922 c->length = rounded_data_size;
923 c->next = fss->free_chunks[fl_index];
924 fss->free_chunks[fl_index] = c;
925 cmem += sizeof (*c) + rounded_data_size;
926 fsh_cached_bytes_add (fsh, rounded_data_size);
929 fss->n_fl_chunk_bytes += batch_size * rounded_data_size;
930 fsh_free_bytes_sub (fsh, size);
936 * Pre-allocates fifo pairs in fifo segment
939 fifo_segment_preallocate_fifo_pairs (fifo_segment_t * fs,
940 u32 rx_fifo_size, u32 tx_fifo_size,
943 u32 rx_rounded_data_size, tx_rounded_data_size, pair_size, pairs_to_alloc;
944 u32 hdrs, pairs_per_slice, alloc_now;
945 fifo_segment_header_t *fsh = fs->h;
946 int rx_fl_index, tx_fl_index, i;
947 fifo_segment_slice_t *fss;
948 uword space_available;
950 /* Parameter check */
951 if (rx_fifo_size == 0 || tx_fifo_size == 0 || *n_fifo_pairs == 0)
954 if (!fs_chunk_size_is_valid (fsh, rx_fifo_size))
956 clib_warning ("rx fifo_size out of range %d", rx_fifo_size);
960 if (!fs_chunk_size_is_valid (fsh, tx_fifo_size))
962 clib_warning ("tx fifo_size out of range %d", tx_fifo_size);
966 rx_rounded_data_size = (1 << (max_log2 (rx_fifo_size)));
967 rx_fl_index = fs_freelist_for_size (rx_fifo_size);
968 tx_rounded_data_size = (1 << (max_log2 (tx_fifo_size)));
969 tx_fl_index = fs_freelist_for_size (tx_fifo_size);
971 hdrs = sizeof (svm_fifo_t) + sizeof (svm_fifo_chunk_t);
973 /* Calculate space requirements */
974 pair_size = 2 * hdrs + rx_rounded_data_size + tx_rounded_data_size;
975 space_available = fsh_free_space (fsh);
976 pairs_to_alloc = space_available / pair_size;
977 pairs_to_alloc = clib_min (pairs_to_alloc, *n_fifo_pairs);
978 pairs_per_slice = pairs_to_alloc / fs->n_slices;
979 pairs_per_slice += pairs_to_alloc % fs->n_slices ? 1 : 0;
981 if (!pairs_per_slice)
984 for (i = 0; i < fs->n_slices; i++)
986 fss = fsh_slice_get (fsh, i);
987 alloc_now = clib_min (pairs_per_slice, *n_fifo_pairs);
988 if (fs_try_alloc_fifo_batch (fsh, fss, rx_fl_index, alloc_now))
989 clib_warning ("rx prealloc failed: pairs %u", alloc_now);
990 if (fs_try_alloc_fifo_batch (fsh, fss, tx_fl_index, alloc_now))
991 clib_warning ("tx prealloc failed: pairs %u", alloc_now);
993 /* Account for the pairs allocated */
994 *n_fifo_pairs -= alloc_now;
999 * Get number of active fifos
1002 fifo_segment_num_fifos (fifo_segment_t * fs)
1004 return clib_atomic_load_relax_n (&fs->h->n_active_fifos);
1008 fs_slice_num_free_fifos (fifo_segment_slice_t * fss)
1013 f = fss->free_fifos;
1026 fifo_segment_num_free_fifos (fifo_segment_t * fs)
1028 fifo_segment_header_t *fsh = fs->h;
1029 fifo_segment_slice_t *fss;
1033 for (slice_index = 0; slice_index < fs->n_slices; slice_index++)
1035 fss = fsh_slice_get (fsh, slice_index);
1036 count += fs_slice_num_free_fifos (fss);
1042 fs_slice_num_free_chunks (fifo_segment_slice_t * fss, u32 size)
1044 u32 count = 0, rounded_size, fl_index;
1045 svm_fifo_chunk_t *c;
1048 /* Count all free chunks? */
1051 for (i = 0; i < vec_len (fss->free_chunks); i++)
1053 c = fss->free_chunks[i];
1066 rounded_size = (1 << (max_log2 (size)));
1067 fl_index = fs_freelist_for_size (rounded_size);
1069 if (fl_index >= vec_len (fss->free_chunks))
1072 c = fss->free_chunks[fl_index];
1085 fifo_segment_num_free_chunks (fifo_segment_t * fs, u32 size)
1087 fifo_segment_header_t *fsh = fs->h;
1088 fifo_segment_slice_t *fss;
1092 for (slice_index = 0; slice_index < fs->n_slices; slice_index++)
1094 fss = fsh_slice_get (fsh, slice_index);
1095 count += fs_slice_num_free_chunks (fss, size);
1101 fifo_segment_update_free_bytes (fifo_segment_t * fs)
1103 fsh_update_free_bytes (fs->h);
1107 fifo_segment_size (fifo_segment_t * fs)
1109 return fs->ssvm.ssvm_size;
1113 fsh_has_reached_mem_limit (fifo_segment_header_t * fsh)
1115 return (fsh->flags & FIFO_SEGMENT_F_MEM_LIMIT) ? 1 : 0;
1119 fsh_reset_mem_limit (fifo_segment_header_t * fsh)
1121 fsh->flags &= ~FIFO_SEGMENT_F_MEM_LIMIT;
1125 fifo_segment_free_bytes (fifo_segment_t * fs)
1127 return fsh_n_free_bytes (fs->h);
1131 fifo_segment_cached_bytes (fifo_segment_t * fs)
1133 return fsh_n_cached_bytes (fs->h);
1137 fifo_segment_fl_chunk_bytes (fifo_segment_t * fs)
1139 fifo_segment_header_t *fsh = fs->h;
1140 fifo_segment_slice_t *fss;
1144 for (slice_index = 0; slice_index < fs->n_slices; slice_index++)
1146 fss = fsh_slice_get (fsh, slice_index);
1147 n_bytes += fss->n_fl_chunk_bytes;
1154 fifo_segment_has_fifos (fifo_segment_t * fs)
1156 fifo_segment_header_t *fsh = fs->h;
1157 fifo_segment_slice_t *fss;
1160 for (slice_index = 0; slice_index < fs->n_slices; slice_index++)
1162 fss = fsh_slice_get (fsh, slice_index);
1170 fifo_segment_get_slice_fifo_list (fifo_segment_t * fs, u32 slice_index)
1172 fifo_segment_header_t *fsh = fs->h;
1173 fifo_segment_slice_t *fss;
1175 fss = fsh_slice_get (fsh, slice_index);
1180 fifo_segment_get_mem_usage (fifo_segment_t * fs)
1184 size = fifo_segment_size (fs);
1186 size - fifo_segment_free_bytes (fs) - fifo_segment_cached_bytes (fs);
1187 return (in_use * 100) / size;
1190 fifo_segment_mem_status_t
1191 fifo_segment_determine_status (fifo_segment_header_t * fsh, u8 usage)
1193 if (!fsh->high_watermark || !fsh->low_watermark)
1194 return MEMORY_PRESSURE_NO_PRESSURE;
1196 /* once the no-memory is detected, the status continues
1197 * until memory usage gets below the high watermark
1199 if (fsh_has_reached_mem_limit (fsh))
1201 if (usage >= fsh->high_watermark)
1202 return MEMORY_PRESSURE_NO_MEMORY;
1204 fsh_reset_mem_limit (fsh);
1207 if (usage >= fsh->high_watermark)
1208 return MEMORY_PRESSURE_HIGH_PRESSURE;
1210 else if (usage >= fsh->low_watermark)
1211 return MEMORY_PRESSURE_LOW_PRESSURE;
1213 return MEMORY_PRESSURE_NO_PRESSURE;
1216 fifo_segment_mem_status_t
1217 fifo_segment_get_mem_status (fifo_segment_t * fs)
1219 fifo_segment_header_t *fsh = fs->h;
1220 u8 usage = fifo_segment_get_mem_usage (fs);
1222 return fifo_segment_determine_status (fsh, usage);
1226 format_fifo_segment_type (u8 * s, va_list * args)
1229 sp = va_arg (*args, fifo_segment_t *);
1230 ssvm_segment_type_t st = ssvm_type (&sp->ssvm);
1232 if (st == SSVM_SEGMENT_PRIVATE)
1233 s = format (s, "%s", "private-heap");
1234 else if (st == SSVM_SEGMENT_MEMFD)
1235 s = format (s, "%s", "memfd");
1236 else if (st == SSVM_SEGMENT_SHM)
1237 s = format (s, "%s", "shm");
1239 s = format (s, "%s", "unknown");
1244 * Segment format function
1247 format_fifo_segment (u8 * s, va_list * args)
1249 u32 count, indent, active_fifos, free_fifos, fifo_hdr = 0;
1250 fifo_segment_t *fs = va_arg (*args, fifo_segment_t *);
1251 int verbose __attribute__ ((unused)) = va_arg (*args, int);
1252 uword est_chunk_bytes, est_free_seg_bytes, free_chunks;
1253 uword chunk_bytes = 0, free_seg_bytes, chunk_size;
1254 uword tracked_cached_bytes;
1255 fifo_segment_header_t *fsh;
1256 fifo_segment_slice_t *fss;
1257 svm_fifo_chunk_t *c;
1262 uword allocated, in_use;
1264 fifo_segment_mem_status_t mem_st;
1266 indent = format_get_indent (s) + 2;
1270 s = format (s, "%-15s%15s%15s%15s%15s%15s", "Name", "Type",
1271 "HeapSize (M)", "ActiveFifos", "FreeFifos", "Address");
1275 fifo_segment_info (fs, &address, &size);
1276 active_fifos = fifo_segment_num_fifos (fs);
1277 free_fifos = fifo_segment_num_free_fifos (fs);
1279 s = format (s, "%-15v%15U%15llu%15u%15u%15llx", ssvm_name (&fs->ssvm),
1280 format_fifo_segment_type, fs, size >> 20ULL, active_fifos,
1281 free_fifos, address);
1288 free_chunks = fifo_segment_num_free_chunks (fs, ~0);
1290 s = format (s, "\n\n%UFree chunks by size:\n", format_white_space,
1293 s = format (s, "\n");
1295 for (slice_index = 0; slice_index < fs->n_slices; slice_index++)
1297 fss = fsh_slice_get (fsh, slice_index);
1298 for (i = 0; i < vec_len (fss->free_chunks); i++)
1300 c = fss->free_chunks[i];
1310 chunk_size = fs_freelist_index_to_size (i);
1311 s = format (s, "%U%-5u kB: %u\n", format_white_space, indent + 2,
1312 chunk_size >> 10, count);
1314 chunk_bytes += count * chunk_size;
1318 fifo_hdr = free_fifos * sizeof (svm_fifo_t);
1319 est_chunk_bytes = fifo_segment_fl_chunk_bytes (fs);
1320 est_free_seg_bytes = fifo_segment_free_bytes (fs);
1321 fifo_segment_update_free_bytes (fs);
1322 free_seg_bytes = fifo_segment_free_bytes (fs);
1323 tracked_cached_bytes = fifo_segment_cached_bytes (fs);
1324 allocated = fifo_segment_size (fs);
1325 in_use = fifo_segment_size (fs) - est_free_seg_bytes - tracked_cached_bytes;
1326 usage = (100.0 * in_use) / allocated;
1327 mem_st = fifo_segment_get_mem_status (fs);
1329 s = format (s, "\n%Useg free bytes: %U (%lu) estimated: %U (%lu)\n",
1330 format_white_space, indent + 2, format_memory_size,
1331 free_seg_bytes, free_seg_bytes, format_memory_size,
1332 est_free_seg_bytes, est_free_seg_bytes);
1335 "%Uchunk free bytes: %U (%lu) estimated: %U (%lu) tracked: %U (%lu)\n",
1336 format_white_space, indent + 2, format_memory_size, chunk_bytes,
1337 chunk_bytes, format_memory_size, est_chunk_bytes, est_chunk_bytes,
1338 format_memory_size, tracked_cached_bytes, tracked_cached_bytes);
1340 format (s, "%Ufifo hdr free bytes: %U (%u) reserved %U (%lu)\n",
1341 format_white_space, indent + 2, format_memory_size, fifo_hdr,
1342 fifo_hdr, format_memory_size, fsh->n_reserved_bytes,
1343 fsh->n_reserved_bytes);
1345 format (s, "%Usegment usage: %.2f%% (%U / %U) %s\n", format_white_space,
1346 indent + 2, usage, format_memory_size, in_use, format_memory_size,
1347 allocated, fifo_segment_mem_status_strings[mem_st]);
1348 s = format (s, "\n");
1354 * fd.io coding-style-patch-verification: ON
1357 * eval: (c-set-style "gnu")