diff options
Diffstat (limited to 'src/svm/svm_fifo.c')
-rw-r--r-- | src/svm/svm_fifo.c | 1044 |
1 files changed, 470 insertions, 574 deletions
diff --git a/src/svm/svm_fifo.c b/src/svm/svm_fifo.c index 3df67135cfd..0168c08e49c 100644 --- a/src/svm/svm_fifo.c +++ b/src/svm/svm_fifo.c @@ -18,6 +18,7 @@ */ #include <svm/svm_fifo.h> +#include <svm/fifo_segment.h> #include <vppinfra/cpu.h> CLIB_MARCH_FN (svm_fifo_copy_to_chunk, void, svm_fifo_t * f, @@ -26,7 +27,8 @@ CLIB_MARCH_FN (svm_fifo_copy_to_chunk, void, svm_fifo_t * f, { u32 n_chunk; - ASSERT (tail_idx >= c->start_byte && tail_idx < c->start_byte + c->length); + ASSERT (f_pos_geq (tail_idx, c->start_byte) + && f_pos_lt (tail_idx, c->start_byte + c->length)); tail_idx -= c->start_byte; n_chunk = c->length - tail_idx; @@ -56,7 +58,8 @@ CLIB_MARCH_FN (svm_fifo_copy_from_chunk, void, svm_fifo_t * f, { u32 n_chunk; - ASSERT (head_idx >= c->start_byte && head_idx < c->start_byte + c->length); + ASSERT (f_pos_geq (head_idx, c->start_byte) + && f_pos_lt (head_idx, c->start_byte + c->length)); head_idx -= c->start_byte; n_chunk = c->length - head_idx; @@ -98,34 +101,10 @@ svm_fifo_copy_from_chunk (svm_fifo_t * f, svm_fifo_chunk_t * c, u32 head_idx, last); } -static inline u8 -position_lt (svm_fifo_t * f, u32 a, u32 b, u32 tail) -{ - return (f_distance_to (f, a, tail) < f_distance_to (f, b, tail)); -} - -static inline u8 -position_leq (svm_fifo_t * f, u32 a, u32 b, u32 tail) -{ - return (f_distance_to (f, a, tail) <= f_distance_to (f, b, tail)); -} - -static inline u8 -position_gt (svm_fifo_t * f, u32 a, u32 b, u32 tail) -{ - return (f_distance_to (f, a, tail) > f_distance_to (f, b, tail)); -} - -static inline u32 -position_diff (svm_fifo_t * f, u32 a, u32 b, u32 tail) -{ - return f_distance_to (f, a, tail) - f_distance_to (f, b, tail); -} - static inline u32 -ooo_segment_end_pos (svm_fifo_t * f, ooo_segment_t * s) +ooo_segment_end_pos (ooo_segment_t * s) { - return (s->start + s->length) % f->size; + return (s->start + s->length); ooo_segment_free (f, s_index); } /* End of search */ @@ -370,11 +346,11 @@ ooo_segment_try_collect (svm_fifo_t * f, u32 n_bytes_enqueued, u32 * tail) } } - ASSERT (bytes <= f->nitems); + ASSERT (bytes <= f->size); return bytes; } -static ooo_segment_t * +__clib_unused static ooo_segment_t * ooo_segment_last (svm_fifo_t * f) { ooo_segment_t *s; @@ -391,36 +367,30 @@ ooo_segment_last (svm_fifo_t * f) void svm_fifo_init (svm_fifo_t * f, u32 size) { + svm_fifo_chunk_t *c, *prev; + u32 first_chunk, min_alloc; + f->size = size; - /* - * usable size of the fifo set to rounded_data_size - 1 - * to differentiate between free fifo and empty fifo. - */ - f->nitems = f->size - 1; f->ooos_list_head = OOO_SEGMENT_INVALID_INDEX; f->segment_index = SVM_FIFO_INVALID_INDEX; f->refcnt = 1; f->head = f->tail = f->flags = 0; - f->head_chunk = f->tail_chunk = f->ooo_enq = f->ooo_deq = f->start_chunk; -} - -void -svm_fifo_init_chunks (svm_fifo_t * f) -{ - svm_fifo_chunk_t *c, *prev; + f->head_chunk = f->tail_chunk = f->start_chunk; + f->ooo_deq = f->ooo_enq = 0; - if (f->start_chunk->next == f->start_chunk) - return; - - f->flags |= SVM_FIFO_F_MULTI_CHUNK; - rb_tree_init (&f->ooo_enq_lookup); - rb_tree_init (&f->ooo_deq_lookup); + first_chunk = f->start_chunk->length; + min_alloc = first_chunk > 16 << 10 ? first_chunk >> 2 : 4096; + min_alloc = clib_min (first_chunk, 64 << 10); + f->min_alloc = min_alloc; + /* + * Initialize chunks + */ f->start_chunk->start_byte = 0; prev = f->start_chunk; c = prev->next; - while (c != f->start_chunk) + while (c) { c->start_byte = prev->start_byte + prev->length; prev = c; @@ -428,11 +398,26 @@ svm_fifo_init_chunks (svm_fifo_t * f) } } +void +svm_fifo_init_ooo_lookup (svm_fifo_t * f, u8 ooo_type) +{ + if (ooo_type == 0) + { + ASSERT (!rb_tree_is_init (&f->ooo_enq_lookup)); + rb_tree_init (&f->ooo_enq_lookup); + } + else + { + ASSERT (!rb_tree_is_init (&f->ooo_deq_lookup)); + rb_tree_init (&f->ooo_deq_lookup); + } +} + /** * Creates a fifo in the current heap. Fails vs blow up the process */ svm_fifo_t * -svm_fifo_create (u32 data_size_in_bytes) +svm_fifo_alloc (u32 data_size_in_bytes) { u32 rounded_data_size; svm_fifo_chunk_t *c; @@ -454,13 +439,13 @@ svm_fifo_create (u32 data_size_in_bytes) return 0; } - c->next = c; + clib_memset (c, 0, sizeof (*c)); c->start_byte = 0; c->length = data_size_in_bytes; - c->rb_index = RBTREE_TNIL_INDEX; + c->enq_rb_index = RBTREE_TNIL_INDEX; + c->deq_rb_index = RBTREE_TNIL_INDEX; f->start_chunk = f->end_chunk = c; - svm_fifo_init (f, data_size_in_bytes); return f; } @@ -485,14 +470,73 @@ svm_fifo_chunk_alloc (u32 size) return c; } -static inline u8 -svm_fifo_chunk_includes_pos (svm_fifo_chunk_t * c, u32 pos) +/** + * Find chunk for given byte position + * + * @param f fifo + * @param pos normalized position in fifo + * + * @return chunk that includes given position or 0 + */ +static svm_fifo_chunk_t * +svm_fifo_find_chunk (svm_fifo_t * f, u32 pos) +{ + svm_fifo_chunk_t *c; + + c = f->start_chunk; + while (c && !f_chunk_includes_pos (c, pos)) + c = c->next; + + return c; +} + +static svm_fifo_chunk_t * +svm_fifo_find_next_chunk (svm_fifo_t * f, svm_fifo_chunk_t * start, u32 pos) +{ + svm_fifo_chunk_t *c; + + ASSERT (start != 0); + + c = start; + while (c && !f_chunk_includes_pos (c, pos)) + c = c->next; + + return c; +} + +u32 +svm_fifo_max_read_chunk (svm_fifo_t * f) +{ + u32 head, tail, end_chunk; + + f_load_head_tail_cons (f, &head, &tail); + ASSERT (!f->head_chunk || f_chunk_includes_pos (f->head_chunk, head)); + + if (!f->head_chunk) + { + f->head_chunk = svm_fifo_find_chunk (f, head); + if (PREDICT_FALSE (!f->head_chunk)) + return 0; + } + + end_chunk = f_chunk_end (f->head_chunk); + + return f_pos_lt (end_chunk, tail) ? end_chunk - head : tail - head; +} + +u32 +svm_fifo_max_write_chunk (svm_fifo_t * f) { - return (pos >= c->start_byte && pos < c->start_byte + c->length); + u32 head, tail; + + f_load_head_tail_prod (f, &head, &tail); + ASSERT (!f->tail_chunk || f_chunk_includes_pos (f->tail_chunk, tail)); + + return f->tail_chunk ? f_chunk_end (f->tail_chunk) - tail : 0; } static rb_node_t * -svm_fifo_find_node_rbtree (rb_tree_t * rt, u32 pos) +f_find_node_rbtree (rb_tree_t * rt, u32 pos) { rb_node_t *cur, *prev; @@ -503,7 +547,7 @@ svm_fifo_find_node_rbtree (rb_tree_t * rt, u32 pos) while (pos != cur->key) { prev = cur; - if (pos < cur->key) + if (f_pos_lt (pos, cur->key)) { cur = rb_node_left (rt, cur); if (rb_node_is_tnil (rt, cur)) @@ -530,501 +574,206 @@ svm_fifo_find_node_rbtree (rb_tree_t * rt, u32 pos) } static svm_fifo_chunk_t * -svm_fifo_find_chunk_rbtree (rb_tree_t * rt, u32 pos) +f_find_chunk_rbtree (rb_tree_t * rt, u32 pos) { svm_fifo_chunk_t *c; rb_node_t *n; - n = svm_fifo_find_node_rbtree (rt, pos); + if (!rb_tree_is_init (rt)) + return 0; + + n = f_find_node_rbtree (rt, pos); if (!n) return 0; c = uword_to_pointer (n->opaque, svm_fifo_chunk_t *); - if (svm_fifo_chunk_includes_pos (c, pos)) + if (f_chunk_includes_pos (c, pos)) return c; return 0; } -/** - * Find chunk for given byte position - * - * @param f fifo - * @param pos normalized position in fifo - * - * @return chunk that includes given position or 0 - */ -static svm_fifo_chunk_t * -svm_fifo_find_chunk (svm_fifo_t * f, u32 pos) -{ - svm_fifo_chunk_t *c; - - c = f->start_chunk; - do - { - if (svm_fifo_chunk_includes_pos (c, pos)) - return c; - c = c->next; - } - while (c != f->start_chunk); - - return 0; -} - static void -svm_fifo_update_ooo_enq (svm_fifo_t * f, u32 ref_pos, u32 start_pos, - u32 end_pos) +f_update_ooo_enq (svm_fifo_t * f, u32 start_pos, u32 end_pos) { rb_tree_t *rt = &f->ooo_enq_lookup; svm_fifo_chunk_t *c; rb_node_t *cur; - if (svm_fifo_chunk_includes_pos (f->ooo_enq, start_pos) - && svm_fifo_chunk_includes_pos (f->ooo_enq, end_pos) - && ref_pos < start_pos) - return; + /* Use linear search if rbtree is not initialized */ + if (PREDICT_FALSE (!rb_tree_is_init (rt))) + { + f->ooo_enq = svm_fifo_find_next_chunk (f, f->tail_chunk, start_pos); + return; + } if (rt->root == RBTREE_TNIL_INDEX) { c = f->tail_chunk; - c->rb_index = rb_tree_add2 (rt, c->start_byte, pointer_to_uword (c)); + ASSERT (c->enq_rb_index == RBTREE_TNIL_INDEX); + c->enq_rb_index = rb_tree_add_custom (rt, c->start_byte, + pointer_to_uword (c), f_pos_lt); } else { - cur = svm_fifo_find_node_rbtree (rt, start_pos); + cur = f_find_node_rbtree (rt, start_pos); c = uword_to_pointer (cur->opaque, svm_fifo_chunk_t *); - if (ref_pos > start_pos && c->start_byte > start_pos) - { - c = f->end_chunk; - ASSERT (c->rb_index != RBTREE_TNIL_INDEX); - } + ASSERT (f_pos_leq (c->start_byte, start_pos)); } - if (svm_fifo_chunk_includes_pos (c, start_pos)) + if (f_chunk_includes_pos (c, start_pos)) f->ooo_enq = c; - if (svm_fifo_chunk_includes_pos (c, end_pos) && ref_pos < end_pos) + if (f_chunk_includes_pos (c, end_pos)) return; do { c = c->next; - if (c->rb_index != RBTREE_TNIL_INDEX) + if (!c || c->enq_rb_index != RBTREE_TNIL_INDEX) break; - c->rb_index = rb_tree_add2 (rt, c->start_byte, pointer_to_uword (c)); + c->enq_rb_index = rb_tree_add_custom (rt, c->start_byte, + pointer_to_uword (c), f_pos_lt); - if (svm_fifo_chunk_includes_pos (c, start_pos)) + if (f_chunk_includes_pos (c, start_pos)) f->ooo_enq = c; - } - while (!svm_fifo_chunk_includes_pos (c, end_pos)); + while (!f_chunk_includes_pos (c, end_pos)); } static void -svm_fifo_update_ooo_deq (svm_fifo_t * f, u32 ref_pos, u32 start_pos, - u32 end_pos) +f_update_ooo_deq (svm_fifo_t * f, u32 start_pos, u32 end_pos) { rb_tree_t *rt = &f->ooo_deq_lookup; rb_node_t *cur; svm_fifo_chunk_t *c; - if (svm_fifo_chunk_includes_pos (f->ooo_deq, start_pos) - && svm_fifo_chunk_includes_pos (f->ooo_deq, end_pos) - && ref_pos < start_pos) - return; + /* Use linear search if rbtree is not initialized */ + if (PREDICT_FALSE (!rb_tree_is_init (rt))) + { + f->ooo_deq = svm_fifo_find_chunk (f, start_pos); + return; + } if (rt->root == RBTREE_TNIL_INDEX) { - c = f->head_chunk; - c->rb_index = rb_tree_add2 (rt, c->start_byte, pointer_to_uword (c)); + c = f->start_chunk; + ASSERT (c->deq_rb_index == RBTREE_TNIL_INDEX); + c->deq_rb_index = rb_tree_add_custom (rt, c->start_byte, + pointer_to_uword (c), f_pos_lt); } else { - cur = svm_fifo_find_node_rbtree (rt, start_pos); + cur = f_find_node_rbtree (rt, start_pos); c = uword_to_pointer (cur->opaque, svm_fifo_chunk_t *); - if (ref_pos > start_pos && c->start_byte > start_pos) - { - c = f->end_chunk; - ASSERT (c->rb_index != RBTREE_TNIL_INDEX); - } + ASSERT (f_pos_leq (c->start_byte, start_pos)); } - if (svm_fifo_chunk_includes_pos (c, start_pos)) + if (f_chunk_includes_pos (c, start_pos)) f->ooo_deq = c; - if (svm_fifo_chunk_includes_pos (c, end_pos) && ref_pos < end_pos) + if (f_chunk_includes_pos (c, end_pos)) return; do { c = c->next; - if (c->rb_index != RBTREE_TNIL_INDEX) + if (!c || c->deq_rb_index != RBTREE_TNIL_INDEX) break; - c->rb_index = rb_tree_add2 (rt, c->start_byte, pointer_to_uword (c)); + c->deq_rb_index = rb_tree_add_custom (rt, c->start_byte, + pointer_to_uword (c), f_pos_lt); - if (svm_fifo_chunk_includes_pos (c, start_pos)) + if (f_chunk_includes_pos (c, start_pos)) f->ooo_deq = c; - } - while (!svm_fifo_chunk_includes_pos (c, end_pos)); + while (!f_chunk_includes_pos (c, end_pos)); } -void -svm_fifo_ooo_deq_track (svm_fifo_t * f, u32 start_pos, u32 end_pos) +static svm_fifo_chunk_t * +f_lookup_clear_enq_chunks (svm_fifo_t * f, svm_fifo_chunk_t * start, + u32 end_pos) { - rb_tree_t *rt = &f->ooo_deq_lookup; + rb_tree_t *rt = &f->ooo_enq_lookup; svm_fifo_chunk_t *c; + rb_node_t *n; - if (svm_fifo_chunk_includes_pos (f->ooo_deq, end_pos) - && start_pos < end_pos) - return; - - c = f->ooo_deq->next; - do + c = start; + while (c && !f_chunk_includes_pos (c, end_pos)) { - ASSERT (c->rb_index == RBTREE_TNIL_INDEX); - rb_tree_add2 (rt, c->start_byte, pointer_to_uword (c)); + if (c->enq_rb_index != RBTREE_TNIL_INDEX) + { + n = rb_node (rt, c->enq_rb_index); + rb_tree_del_node (rt, n); + c->enq_rb_index = RBTREE_TNIL_INDEX; + } c = c->next; } - while (!svm_fifo_chunk_includes_pos (c, end_pos)); + + /* No ooo segments left, so make sure the current chunk + * is not tracked in the enq rbtree */ + if (f->ooos_list_head == OOO_SEGMENT_INVALID_INDEX + && c && c->enq_rb_index != RBTREE_TNIL_INDEX) + { + n = rb_node (rt, c->enq_rb_index); + rb_tree_del_node (rt, n); + c->enq_rb_index = RBTREE_TNIL_INDEX; + } + + return c; } static svm_fifo_chunk_t * -svm_fifo_lookup_clear_chunks (svm_fifo_t * f, rb_tree_t * rt, - svm_fifo_chunk_t * start, u32 start_pos, - u32 end_pos) +f_lookup_clear_deq_chunks (svm_fifo_t * f, svm_fifo_chunk_t * start, + u32 end_pos) { + rb_tree_t *rt = &f->ooo_deq_lookup; svm_fifo_chunk_t *c; rb_node_t *n; - /* Nothing to do if still in the same chunk and not wrapped */ - if (svm_fifo_chunk_includes_pos (start, end_pos) && start_pos < end_pos) - return start; - c = start; - do + while (c && !f_chunk_includes_pos (c, end_pos)) { - if (c->rb_index == RBTREE_TNIL_INDEX) + if (c->deq_rb_index != RBTREE_TNIL_INDEX) { - c = c->next; - continue; + n = rb_node (rt, c->deq_rb_index); + rb_tree_del_node (rt, n); + c->deq_rb_index = RBTREE_TNIL_INDEX; } - n = rb_node (rt, c->rb_index); - rb_tree_del_node (rt, n); - c->rb_index = RBTREE_TNIL_INDEX; c = c->next; } - while (!svm_fifo_chunk_includes_pos (c, end_pos)); return c; } -static inline void -svm_fifo_grow (svm_fifo_t * f, svm_fifo_chunk_t * c) -{ - svm_fifo_chunk_t *prev; - u32 add_bytes = 0; - - if (!c) - return; - - f->end_chunk->next = c; - while (c) - { - add_bytes += c->length; - prev = c; - c = c->next; - } - f->end_chunk = prev; - prev->next = f->start_chunk; - f->size += add_bytes; - f->nitems = f->size - 1; - f->new_chunks = 0; -} - -static void -svm_fifo_try_grow (svm_fifo_t * f, u32 new_head) -{ - if (new_head > f->tail) - return; - - svm_fifo_grow (f, f->new_chunks); - f->flags &= ~SVM_FIFO_F_GROW; -} - void svm_fifo_add_chunk (svm_fifo_t * f, svm_fifo_chunk_t * c) { svm_fifo_chunk_t *cur, *prev; - /* Initialize rbtree if needed and add default chunk to it. Expectation is - * that this is called with the heap where the rbtree's pool is pushed. */ - if (!(f->flags & SVM_FIFO_F_MULTI_CHUNK)) - { - ASSERT (f->start_chunk->next == f->start_chunk); - rb_tree_init (&f->ooo_enq_lookup); - rb_tree_init (&f->ooo_deq_lookup); - f->flags |= SVM_FIFO_F_MULTI_CHUNK; - } - - /* If fifo is not wrapped, update the size now */ - if (!svm_fifo_is_wrapped (f)) - { - /* Initialize chunks and add to lookup rbtree */ - cur = c; - if (f->new_chunks) - { - prev = f->new_chunks; - while (prev->next) - prev = prev->next; - prev->next = c; - } - else - prev = f->end_chunk; - - while (cur) - { - cur->start_byte = prev->start_byte + prev->length; - cur->rb_index = RBTREE_TNIL_INDEX; - prev = cur; - cur = cur->next; - } - - ASSERT (!f->new_chunks); - svm_fifo_grow (f, c); - return; - } - - /* Wrapped */ - if (f->flags & SVM_FIFO_F_SINGLE_THREAD_OWNED) - { - ASSERT (f->master_thread_index == os_get_thread_index ()); - - if (!f->new_chunks && f->head_chunk != f->tail_chunk) - { - u32 head = 0, tail = 0; - f_load_head_tail_cons (f, &head, &tail); - - svm_fifo_chunk_t *tmp = f->tail_chunk->next; - - prev = f->tail_chunk; - u32 add_bytes = 0; - cur = prev->next; - while (cur != f->start_chunk) - { - /* remove any existing rb_tree entry */ - if (cur->rb_index != RBTREE_TNIL_INDEX) - { - rb_tree_del (&f->ooo_enq_lookup, cur->start_byte); - rb_tree_del (&f->ooo_deq_lookup, cur->start_byte); - } - cur->rb_index = RBTREE_TNIL_INDEX; - cur = cur->next; - } - - /* insert new chunk after the tail_chunk */ - f->tail_chunk->next = c; - while (c) - { - add_bytes += c->length; - c->start_byte = prev->start_byte + prev->length; - cur->rb_index = RBTREE_TNIL_INDEX; - - prev = c; - c = c->next; - } - prev->next = tmp; - - /* shift existing chunks along */ - cur = tmp; - while (cur != f->start_chunk) - { - cur->start_byte = prev->start_byte + prev->length; - prev = cur; - cur = cur->next; - } - - f->size += add_bytes; - f->nitems = f->size - 1; - f->new_chunks = 0; - head += add_bytes; - - clib_atomic_store_rel_n (&f->head, head); - ASSERT (svm_fifo_is_sane (f)); - - return; - } - } - - /* Wrapped, and optimization of single-thread-owned fifo cannot be applied */ - /* Initialize chunks and add to lookup rbtree */ cur = c; - if (f->new_chunks) - { - prev = f->new_chunks; - while (prev->next) - prev = prev->next; - prev->next = c; - } - else - prev = f->end_chunk; + prev = f->end_chunk; while (cur) { cur->start_byte = prev->start_byte + prev->length; - cur->rb_index = RBTREE_TNIL_INDEX; - prev = cur; - cur = cur->next; - } - - /* Postpone size update */ - if (!f->new_chunks) - { - f->new_chunks = c; - f->flags |= SVM_FIFO_F_GROW; - } -} - -/** - * Removes chunks that are after fifo end byte - */ -svm_fifo_chunk_t * -svm_fifo_collect_chunks (svm_fifo_t * f) -{ - svm_fifo_chunk_t *list, *cur; - - f->flags &= ~SVM_FIFO_F_COLLECT_CHUNKS; - - list = f->new_chunks; - f->new_chunks = 0; - cur = list; - while (cur) - { - if (cur->rb_index != RBTREE_TNIL_INDEX) - { - rb_tree_del (&f->ooo_enq_lookup, cur->start_byte); - rb_tree_del (&f->ooo_deq_lookup, cur->start_byte); - } - cur = cur->next; - } - - return list; -} - -void -svm_fifo_try_shrink (svm_fifo_t * f, u32 head, u32 tail) -{ - u32 len_to_shrink = 0, tail_pos, len, last_pos; - svm_fifo_chunk_t *cur, *prev, *next, *start; - - tail_pos = tail; - if (f->ooos_list_head != OOO_SEGMENT_INVALID_INDEX) - { - ooo_segment_t *last = ooo_segment_last (f); - tail_pos = ooo_segment_end_pos (f, last); - } - - if (f->size_decrement) - { - /* Figure out available free space considering that there may be - * ooo segments */ - len = clib_min (f->size_decrement, f_free_count (f, head, tail_pos)); - f->nitems -= len; - f->size_decrement -= len; - } - - /* Remove tail chunks if the following hold: - * - not wrapped - * - last used byte less than start of last chunk - */ - if (tail_pos >= head && tail_pos < f->end_chunk->start_byte) - { - /* Lookup the last position not to be removed. Since size still needs - * to be nitems + 1, nitems must fall within the usable space. Also, - * first segment is not removable, so tail_pos can be 0. */ - last_pos = tail_pos > 0 ? tail_pos - 1 : tail_pos; - prev = svm_fifo_find_chunk (f, clib_max (f->nitems, last_pos)); - next = prev->next; - /* If tail_pos is first position in next, skip the chunk, otherwise, - * we must update the tail and, if fifo size is 0, even the head. - * We should not invalidate the tail for the caller and must not change - * consumer owned variables from code that's typically called by the - * producer */ - if (next->start_byte == tail_pos) - { - prev = next; - next = next->next; - } - while (next != f->start_chunk) - { - cur = next; - next = cur->next; - len_to_shrink += cur->length; - } - if (len_to_shrink) - { - f->size -= len_to_shrink; - start = prev->next; - prev->next = f->start_chunk; - f->end_chunk = prev; - cur->next = f->new_chunks; - f->new_chunks = start; - } - } - - if (!f->size_decrement && f->size == f->nitems + 1) - { - f->flags &= ~SVM_FIFO_F_SHRINK; - f->flags |= SVM_FIFO_F_COLLECT_CHUNKS; - if (f->start_chunk == f->start_chunk->next) - f->flags &= ~SVM_FIFO_F_MULTI_CHUNK; - } -} + cur->enq_rb_index = RBTREE_TNIL_INDEX; + cur->deq_rb_index = RBTREE_TNIL_INDEX; -/** - * Request to reduce fifo size by amount of bytes - */ -int -svm_fifo_reduce_size (svm_fifo_t * f, u32 len, u8 try_shrink) -{ - svm_fifo_chunk_t *cur; - u32 actual_len = 0; - - /* Abort if trying to reduce by more than fifo size or if - * fifo is undergoing resizing already */ - if (len >= f->size || f->size > f->nitems + 1 - || (f->flags & SVM_FIFO_F_SHRINK) || (f->flags & SVM_FIFO_F_GROW)) - return 0; - - /* last chunk that will not be removed */ - cur = svm_fifo_find_chunk (f, f->nitems - len); - - /* sum length of chunks that will be removed */ - cur = cur->next; - while (cur != f->start_chunk) - { - actual_len += cur->length; + prev = cur; cur = cur->next; } - ASSERT (actual_len <= len); - if (!actual_len) - return 0; - - f->size_decrement = actual_len; - f->flags |= SVM_FIFO_F_SHRINK; + prev->next = 0; + f->end_chunk->next = c; + f->end_chunk = prev; - if (try_shrink) - { - u32 head, tail; - f_load_head_tail_prod (f, &head, &tail); - svm_fifo_try_shrink (f, head, tail); - } + if (!f->tail_chunk) + f->tail_chunk = c; - return actual_len; + return; } void @@ -1054,9 +803,13 @@ svm_fifo_overwrite_head (svm_fifo_t * f, u8 * src, u32 len) u32 head, tail, head_idx; svm_fifo_chunk_t *c; - ASSERT (len <= f->nitems); + ASSERT (len <= f->size); f_load_head_tail_cons (f, &head, &tail); + + if (!f->head_chunk) + f->head_chunk = svm_fifo_find_chunk (f, head); + c = f->head_chunk; head_idx = head - c->start_byte; n_chunk = c->length - head_idx; @@ -1064,30 +817,65 @@ svm_fifo_overwrite_head (svm_fifo_t * f, u8 * src, u32 len) clib_memcpy_fast (&c->data[head_idx], src, len); else { + ASSERT (len - n_chunk <= c->next->length); clib_memcpy_fast (&c->data[head_idx], src, n_chunk); clib_memcpy_fast (&c->next->data[0], src + n_chunk, len - n_chunk); } } +static int +f_try_grow (svm_fifo_t * f, u32 head, u32 tail, u32 len) +{ + svm_fifo_chunk_t *c; + u32 alloc_size, free_alloced; + + free_alloced = f_chunk_end (f->end_chunk) - tail; + ASSERT (free_alloced < len); + + alloc_size = clib_min (f->min_alloc, f->size - (tail - head)); + alloc_size = clib_max (alloc_size, len - free_alloced); + + c = fsh_alloc_chunk (f->fs_hdr, f->slice_index, alloc_size); + if (PREDICT_FALSE (!c)) + return -1; + + svm_fifo_add_chunk (f, c); + return 0; +} + int svm_fifo_enqueue (svm_fifo_t * f, u32 len, const u8 * src) { u32 tail, head, free_count; + svm_fifo_chunk_t *old_tail_c; + + f->ooos_newest = OOO_SEGMENT_INVALID_INDEX; f_load_head_tail_prod (f, &head, &tail); /* free space in fifo can only increase during enqueue: SPSC */ free_count = f_free_count (f, head, tail); - f->ooos_newest = OOO_SEGMENT_INVALID_INDEX; - if (PREDICT_FALSE (free_count == 0)) return SVM_FIFO_EFULL; /* number of bytes we're going to copy */ len = clib_min (free_count, len); + + if (f_pos_gt (tail + len, f_chunk_end (f->end_chunk))) + { + if (PREDICT_FALSE (f_try_grow (f, head, tail, len))) + { + len = f_chunk_end (f->end_chunk) - tail; + if (!len) + return SVM_FIFO_EGROW; + } + } + + old_tail_c = f->tail_chunk; + svm_fifo_copy_to_chunk (f, f->tail_chunk, tail, src, len, &f->tail_chunk); - tail = (tail + len) % f->size; + tail = tail + len; svm_fifo_trace_add (f, head, len, 2); @@ -1095,10 +883,9 @@ svm_fifo_enqueue (svm_fifo_t * f, u32 len, const u8 * src) if (PREDICT_FALSE (f->ooos_list_head != OOO_SEGMENT_INVALID_INDEX)) { len += ooo_segment_try_collect (f, len, &tail); - if (f->flags & SVM_FIFO_F_MULTI_CHUNK) - f->tail_chunk = svm_fifo_lookup_clear_chunks (f, &f->ooo_enq_lookup, - f->tail_chunk, f->tail, - tail); + /* Tail chunk might've changed even if nothing was collected */ + f->tail_chunk = f_lookup_clear_enq_chunks (f, old_tail_c, tail); + f->ooo_enq = 0; } /* store-rel: producer owned index (paired with load-acq in consumer) */ @@ -1117,30 +904,33 @@ svm_fifo_enqueue (svm_fifo_t * f, u32 len, const u8 * src) int svm_fifo_enqueue_with_offset (svm_fifo_t * f, u32 offset, u32 len, u8 * src) { - u32 tail, head, free_count, tail_idx; + u32 tail, head, free_count, enq_pos; f_load_head_tail_prod (f, &head, &tail); - if (PREDICT_FALSE (f->flags & SVM_FIFO_F_SHRINK)) - svm_fifo_try_shrink (f, head, tail); - /* free space in fifo can only increase during enqueue: SPSC */ free_count = f_free_count (f, head, tail); + f->ooos_newest = OOO_SEGMENT_INVALID_INDEX; /* will this request fit? */ if ((len + offset) > free_count) return SVM_FIFO_EFULL; - f->ooos_newest = OOO_SEGMENT_INVALID_INDEX; + enq_pos = tail + offset; + + if (f_pos_gt (enq_pos + len, f_chunk_end (f->end_chunk))) + { + if (PREDICT_FALSE (f_try_grow (f, head, tail, offset + len))) + return SVM_FIFO_EGROW; + } + svm_fifo_trace_add (f, offset, len, 1); ooo_segment_add (f, offset, head, tail, len); - tail_idx = (tail + offset) % f->size; - if (f->flags & SVM_FIFO_F_MULTI_CHUNK) - svm_fifo_update_ooo_enq (f, f->tail, tail_idx, - (tail_idx + len) % f->size); + if (!f->ooo_enq || !f_chunk_includes_pos (f->ooo_enq, enq_pos)) + f_update_ooo_enq (f, enq_pos, enq_pos + len); - svm_fifo_copy_to_chunk (f, f->ooo_enq, tail_idx, src, len, &f->ooo_enq); + svm_fifo_copy_to_chunk (f, f->ooo_enq, enq_pos, src, len, &f->ooo_enq); return 0; } @@ -1156,17 +946,74 @@ svm_fifo_enqueue_nocopy (svm_fifo_t * f, u32 len) ASSERT (len <= svm_fifo_max_enqueue_prod (f)); /* load-relaxed: producer owned index */ tail = f->tail; - tail = (tail + len) % f->size; + tail = tail + len; - if (f->flags & SVM_FIFO_F_MULTI_CHUNK) - f->tail_chunk = svm_fifo_lookup_clear_chunks (f, &f->ooo_enq_lookup, - f->tail_chunk, f->tail, - tail); + if (rb_tree_is_init (&f->ooo_enq_lookup)) + { + f->tail_chunk = f_lookup_clear_enq_chunks (f, f->tail_chunk, tail); + f->ooo_enq = 0; + } + else + { + f->tail_chunk = svm_fifo_find_next_chunk (f, f->tail_chunk, tail); + } /* store-rel: producer owned index (paired with load-acq in consumer) */ clib_atomic_store_rel_n (&f->tail, tail); } +always_inline svm_fifo_chunk_t * +f_unlink_chunks (svm_fifo_t * f, u32 end_pos, u8 maybe_ooo) +{ + svm_fifo_chunk_t *start, *prev = 0, *c; + rb_tree_t *rt; + rb_node_t *n; + + ASSERT (!f_chunk_includes_pos (f->start_chunk, end_pos)); + + if (maybe_ooo) + rt = &f->ooo_deq_lookup; + + c = f->start_chunk; + + do + { + if (maybe_ooo && c->deq_rb_index != RBTREE_TNIL_INDEX) + { + n = rb_node (rt, c->deq_rb_index); + ASSERT (n == f_find_node_rbtree (rt, c->start_byte)); + rb_tree_del_node (rt, n); + c->deq_rb_index = RBTREE_TNIL_INDEX; + } + if (!c->next) + break; + prev = c; + c = c->next; + } + while (!f_chunk_includes_pos (c, end_pos)); + + if (maybe_ooo) + { + if (f->ooo_deq && f_pos_lt (f->ooo_deq->start_byte, f_chunk_end (c))) + f->ooo_deq = 0; + } + else + { + if (PREDICT_FALSE (f->ooo_deq != 0)) + f->ooo_deq = 0; + } + + /* Avoid unlinking the last chunk */ + if (!prev) + return 0; + + prev->next = 0; + start = f->start_chunk; + f->start_chunk = c; + + return start; +} + int svm_fifo_dequeue (svm_fifo_t * f, u32 len, u8 * dst) { @@ -1181,11 +1028,16 @@ svm_fifo_dequeue (svm_fifo_t * f, u32 len, u8 * dst) return SVM_FIFO_EEMPTY; len = clib_min (cursize, len); + + if (!f->head_chunk) + f->head_chunk = svm_fifo_find_chunk (f, head); + svm_fifo_copy_from_chunk (f, f->head_chunk, head, dst, len, &f->head_chunk); - head = (head + len) % f->size; + head = head + len; - if (PREDICT_FALSE (f->flags & SVM_FIFO_F_GROW)) - svm_fifo_try_grow (f, head); + if (f_pos_geq (head, f_chunk_end (f->start_chunk))) + fsh_collect_chunks (f->fs_hdr, f->slice_index, + f_unlink_chunks (f, head, 0)); /* store-rel: consumer owned index (paired with load-acq in producer) */ clib_atomic_store_rel_n (&f->head, head); @@ -1207,10 +1059,10 @@ svm_fifo_peek (svm_fifo_t * f, u32 offset, u32 len, u8 * dst) return SVM_FIFO_EEMPTY; len = clib_min (cursize - offset, len); - head_idx = (head + offset) % f->size; + head_idx = head + offset; - if (f->flags & SVM_FIFO_F_MULTI_CHUNK) - svm_fifo_update_ooo_deq (f, head, head_idx, (head_idx + len) % f->size); + if (!f->ooo_deq || !f_chunk_includes_pos (f->ooo_deq, head_idx)) + f_update_ooo_deq (f, head_idx, head_idx + len); svm_fifo_copy_from_chunk (f, f->ooo_deq, head_idx, dst, len, &f->ooo_deq); return len; @@ -1234,15 +1086,15 @@ svm_fifo_dequeue_drop (svm_fifo_t * f, u32 len) svm_fifo_trace_add (f, tail, total_drop_bytes, 3); /* move head */ - head = (head + total_drop_bytes) % f->size; - - if (f->flags & SVM_FIFO_F_MULTI_CHUNK) - f->head_chunk = svm_fifo_lookup_clear_chunks (f, &f->ooo_deq_lookup, - f->head_chunk, f->head, - head); + head = head + total_drop_bytes; - if (PREDICT_FALSE (f->flags & SVM_FIFO_F_GROW)) - svm_fifo_try_grow (f, head); + if (f_pos_geq (head, f_chunk_end (f->start_chunk))) + { + fsh_collect_chunks (f->fs_hdr, f->slice_index, + f_unlink_chunks (f, head, 1)); + f->head_chunk = + f_chunk_includes_pos (f->start_chunk, head) ? f->start_chunk : 0; + } /* store-rel: consumer owned index (paired with load-acq in producer) */ clib_atomic_store_rel_n (&f->head, head); @@ -1250,25 +1102,48 @@ svm_fifo_dequeue_drop (svm_fifo_t * f, u32 len) return total_drop_bytes; } +/** + * Drop all data from fifo + * + * Should be called only from vpp side because of lookup cleanup + */ void svm_fifo_dequeue_drop_all (svm_fifo_t * f) { - /* consumer foreign index */ - u32 tail = clib_atomic_load_acq_n (&f->tail); + u32 head, tail; + + f_load_head_tail_all_acq (f, &head, &tail); - if (f->flags & SVM_FIFO_F_MULTI_CHUNK) - f->head_chunk = svm_fifo_lookup_clear_chunks (f, &f->ooo_deq_lookup, - f->head_chunk, tail, - tail - 1); + if (!f->head_chunk || !f_chunk_includes_pos (f->head_chunk, head)) + f->head_chunk = svm_fifo_find_chunk (f, head); - if (PREDICT_FALSE (f->flags & SVM_FIFO_F_GROW)) - svm_fifo_try_grow (f, tail); + f->head_chunk = f_lookup_clear_deq_chunks (f, f->head_chunk, tail); + + if (f_pos_geq (tail, f_chunk_end (f->start_chunk))) + fsh_collect_chunks (f->fs_hdr, f->slice_index, + f_unlink_chunks (f, tail, 0)); /* store-rel: consumer owned index (paired with load-acq in producer) */ clib_atomic_store_rel_n (&f->head, tail); } int +svm_fifo_fill_chunk_list (svm_fifo_t * f) +{ + u32 head, tail; + + f_load_head_tail_prod (f, &head, &tail); + + if (f_chunk_end (f->end_chunk) - head >= f->size) + return 0; + + if (f_try_grow (f, head, tail, f->size - (tail - head))) + return SVM_FIFO_EGROW; + + return 0; +} + +int svm_fifo_segments (svm_fifo_t * f, svm_fifo_seg_t * fs) { u32 cursize, head, tail, head_idx; @@ -1309,7 +1184,7 @@ svm_fifo_segments_free (svm_fifo_t * f, svm_fifo_seg_t * fs) head = f->head; ASSERT (fs[0].data == f->head_chunk->data + head); - head = (head + fs[0].len + fs[1].len) % f->size; + head = (head + fs[0].len + fs[1].len); /* store-rel: consumer owned index (paired with load-acq in producer) */ clib_atomic_store_rel_n (&f->head, head); } @@ -1325,6 +1200,10 @@ void svm_fifo_clone (svm_fifo_t * df, svm_fifo_t * sf) { u32 head, tail; + + /* Support only single chunk clones for now */ + ASSERT (svm_fifo_n_chunks (sf) == 1); + clib_memcpy_fast (df->head_chunk->data, sf->head_chunk->data, sf->size); f_load_head_tail_all_acq (sf, &head, &tail); @@ -1350,20 +1229,17 @@ svm_fifo_first_ooo_segment (svm_fifo_t * f) void svm_fifo_init_pointers (svm_fifo_t * f, u32 head, u32 tail) { - head = head % f->size; - tail = tail % f->size; + svm_fifo_chunk_t *c; + clib_atomic_store_rel_n (&f->head, head); clib_atomic_store_rel_n (&f->tail, tail); - if (f->flags & SVM_FIFO_F_MULTI_CHUNK) - { - svm_fifo_chunk_t *c; - c = svm_fifo_find_chunk (f, head); - ASSERT (c != 0); - f->head_chunk = f->ooo_deq = c; - c = svm_fifo_find_chunk (f, tail); - ASSERT (c != 0); - f->tail_chunk = f->ooo_enq = c; - } + + c = svm_fifo_find_chunk (f, head); + ASSERT (c != 0); + f->head_chunk = f->ooo_deq = c; + c = svm_fifo_find_chunk (f, tail); + ASSERT (c != 0); + f->tail_chunk = f->ooo_enq = c; } void @@ -1392,20 +1268,54 @@ svm_fifo_del_subscriber (svm_fifo_t * f, u8 subscriber) u8 svm_fifo_is_sane (svm_fifo_t * f) { - if (f->size - 1 != f->nitems && !(f->flags & SVM_FIFO_F_SHRINK)) - return 0; - if (!svm_fifo_chunk_includes_pos (f->head_chunk, f->head)) + svm_fifo_chunk_t *tmp; + + if (f->head_chunk && !f_chunk_includes_pos (f->head_chunk, f->head)) return 0; - if (!svm_fifo_chunk_includes_pos (f->tail_chunk, f->tail)) + if (f->tail_chunk && !f_chunk_includes_pos (f->tail_chunk, f->tail)) return 0; + if (f->ooo_deq) + { + if (rb_tree_is_init (&f->ooo_deq_lookup)) + { + if (f_pos_lt (f->ooo_deq->start_byte, f->start_chunk->start_byte) + || f_pos_gt (f->ooo_deq->start_byte, + f_chunk_end (f->end_chunk))) + return 0; - if (f->start_chunk->next != f->start_chunk) + tmp = f_find_chunk_rbtree (&f->ooo_deq_lookup, + f->ooo_deq->start_byte); + } + else + tmp = svm_fifo_find_chunk (f, f->ooo_deq->start_byte); + if (tmp != f->ooo_deq) + return 0; + } + if (f->ooo_enq) { - svm_fifo_chunk_t *c, *prev = 0, *tmp; - u32 size = 0; + if (rb_tree_is_init (&f->ooo_enq_lookup)) + { + if (f_pos_lt (f->ooo_enq->start_byte, f->start_chunk->start_byte) + || f_pos_gt (f->ooo_enq->start_byte, + f_chunk_end (f->end_chunk))) + return 0; - if (!(f->flags & SVM_FIFO_F_MULTI_CHUNK)) + tmp = f_find_chunk_rbtree (&f->ooo_enq_lookup, + f->ooo_enq->start_byte); + } + else + { + tmp = svm_fifo_find_next_chunk (f, f->tail_chunk, + f->ooo_enq->start_byte); + } + if (tmp != f->ooo_enq) return 0; + } + + if (f->start_chunk->next) + { + svm_fifo_chunk_t *c, *prev = 0, *tmp; + u32 chunks_bytes = 0; c = f->start_chunk; do @@ -1416,75 +1326,61 @@ svm_fifo_is_sane (svm_fifo_t * f) if (prev && (prev->start_byte + prev->length != c->start_byte)) return 0; - if (c->rb_index != RBTREE_TNIL_INDEX) + if (c->enq_rb_index != RBTREE_TNIL_INDEX) { - u8 found = 0; - - tmp = svm_fifo_find_chunk_rbtree (&f->ooo_enq_lookup, - c->start_byte); + tmp = f_find_chunk_rbtree (&f->ooo_enq_lookup, c->start_byte); if (tmp) { - found = 1; if (tmp != c) return 0; } - - tmp = svm_fifo_find_chunk_rbtree (&f->ooo_deq_lookup, - c->start_byte); + } + if (c->deq_rb_index != RBTREE_TNIL_INDEX) + { + tmp = f_find_chunk_rbtree (&f->ooo_deq_lookup, c->start_byte); if (tmp) { - if (found) - return 0; - - found = 1; if (tmp != c) return 0; } - if (!found) - return 0; } - size += c->length; + chunks_bytes += c->length; prev = c; c = c->next; } - while (c != f->start_chunk); + while (c); - if (size != f->size) + if (chunks_bytes < f->tail - f->head) return 0; } return 1; } -u8 -svm_fifo_set_single_thread_owned (svm_fifo_t * f) +u32 +svm_fifo_n_chunks (svm_fifo_t * f) { - if (f->flags & SVM_FIFO_F_SINGLE_THREAD_OWNED) - { - if (f->master_thread_index == os_get_thread_index ()) - { - /* just a duplicate call */ - return 0; - } + svm_fifo_chunk_t *c; + int n_chunks = 0; - /* already owned by another thread */ - return 1; + c = f->start_chunk; + while (c) + { + n_chunks++; + c = c->next; } - f->flags |= SVM_FIFO_F_SINGLE_THREAD_OWNED; - return 0; + return n_chunks; } u8 * format_ooo_segment (u8 * s, va_list * args) { - svm_fifo_t *f = va_arg (*args, svm_fifo_t *); + svm_fifo_t __clib_unused *f = va_arg (*args, svm_fifo_t *); ooo_segment_t *seg = va_arg (*args, ooo_segment_t *); - u32 normalized_start = (seg->start + f->nitems - f->tail) % f->size; - s = format (s, "[%u, %u], len %u, next %d, prev %d", normalized_start, - (normalized_start + seg->length) % f->size, seg->length, - seg->next, seg->prev); + s = format (s, "[%u, %u], len %u, next %d, prev %d", seg->start, + seg->start + seg->length, seg->length, seg->next, seg->prev); return s; } @@ -1532,9 +1428,10 @@ svm_fifo_replay (u8 * s, svm_fifo_t * f, u8 no_read, u8 verbose) trace_len = 0; #endif - dummy_fifo = svm_fifo_create (f->size); - clib_memset (f->head_chunk->data, 0xFF, f->nitems); - vec_validate (data, f->nitems); + dummy_fifo = svm_fifo_alloc (f->size); + svm_fifo_init (f, f->size); + clib_memset (f->head_chunk->data, 0xFF, f->size); + vec_validate (data, f->size); for (i = 0; i < vec_len (data); i++) data[i] = i; @@ -1545,7 +1442,7 @@ svm_fifo_replay (u8 * s, svm_fifo_t * f, u8 no_read, u8 verbose) { if (verbose) s = format (s, "adding [%u, %u]:", trace[i].offset, - (trace[i].offset + trace[i].len) % dummy_fifo->size); + (trace[i].offset + trace[i].len)); svm_fifo_enqueue_with_offset (dummy_fifo, trace[i].offset, trace[i].len, &data[offset]); } @@ -1600,11 +1497,10 @@ format_svm_fifo (u8 * s, va_list * args) return s; indent = format_get_indent (s); - s = format (s, "cursize %u nitems %u has_event %d\n", - svm_fifo_max_dequeue (f), f->nitems, f->has_event); + s = format (s, "cursize %u nitems %u has_event %d min_alloc %u\n", + svm_fifo_max_dequeue (f), f->size, f->has_event, f->min_alloc); s = format (s, "%Uhead %u tail %u segment manager %u\n", format_white_space, - indent, (f->head % f->size), (f->tail % f->size), - f->segment_manager); + indent, f->head, f->tail, f->segment_manager); if (verbose > 1) s = format (s, "%Uvpp session %d thread %d app session %d thread %d\n", |