static inline u8
position_lt (svm_fifo_t * f, u32 a, u32 b, u32 tail)
{
- return (ooo_segment_distance_from_tail (f, a, tail)
- < ooo_segment_distance_from_tail (f, b, 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 (ooo_segment_distance_from_tail (f, a, tail)
- <= ooo_segment_distance_from_tail (f, b, 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 (ooo_segment_distance_from_tail (f, a, tail)
- > ooo_segment_distance_from_tail (f, b, tail));
+ return (f_distance_to (f, a, tail) > f_distance_to (f, b, tail));
}
static inline u32
-position_diff (svm_fifo_t * f, u32 posa, u32 posb, u32 tail)
+position_diff (svm_fifo_t * f, u32 a, u32 b, u32 tail)
{
- return ooo_segment_distance_from_tail (f, posa, tail)
- - ooo_segment_distance_from_tail (f, posb, 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)
{
- return s->start + s->length;
+ return (s->start + s->length) % f->size;
}
-u8 *
-format_ooo_segment (u8 * s, va_list * args)
+void
+svm_fifo_free_ooo_data (svm_fifo_t * f)
{
- svm_fifo_t *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);
+ pool_free (f->ooo_segments);
+}
+
+static inline ooo_segment_t *
+ooo_segment_prev (svm_fifo_t * f, ooo_segment_t * s)
+{
+ if (s->prev == OOO_SEGMENT_INVALID_INDEX)
+ return 0;
+ return pool_elt_at_index (f->ooo_segments, s->prev);
+}
+
+static inline ooo_segment_t *
+ooo_segment_next (svm_fifo_t * f, ooo_segment_t * s)
+{
+ if (s->next == OOO_SEGMENT_INVALID_INDEX)
+ return 0;
+ return pool_elt_at_index (f->ooo_segments, s->next);
+}
+
+static inline ooo_segment_t *
+ooo_segment_alloc (svm_fifo_t * f, u32 start, u32 length)
+{
+ ooo_segment_t *s;
+
+ pool_get (f->ooo_segments, s);
+
+ s->start = start;
+ s->length = length;
+ s->prev = s->next = OOO_SEGMENT_INVALID_INDEX;
+
return s;
}
-u8 *
-svm_fifo_dump_trace (u8 * s, svm_fifo_t * f)
+static inline void
+ooo_segment_free (svm_fifo_t * f, u32 index)
{
-#if SVM_FIFO_TRACE
- svm_fifo_trace_elem_t *seg = 0;
- int i = 0;
+ ooo_segment_t *cur, *prev = 0, *next = 0;
+ cur = pool_elt_at_index (f->ooo_segments, index);
- if (f->trace)
+ if (cur->next != OOO_SEGMENT_INVALID_INDEX)
{
- vec_foreach (seg, f->trace)
- {
- s = format (s, "{%u, %u, %u}, ", seg->offset, seg->len, seg->action);
- i++;
- if (i % 5 == 0)
- s = format (s, "\n");
- }
- s = format (s, "\n");
+ next = pool_elt_at_index (f->ooo_segments, cur->next);
+ next->prev = cur->prev;
}
- return s;
-#else
- return 0;
-#endif
+
+ if (cur->prev != OOO_SEGMENT_INVALID_INDEX)
+ {
+ prev = pool_elt_at_index (f->ooo_segments, cur->prev);
+ prev->next = cur->next;
+ }
+ else
+ {
+ f->ooos_list_head = cur->next;
+ }
+
+ pool_put (f->ooo_segments, cur);
}
-u8 *
-svm_fifo_replay (u8 * s, svm_fifo_t * f, u8 no_read, u8 verbose)
+/**
+ * Add segment to fifo's out-of-order segment list. Takes care of merging
+ * adjacent segments and removing overlapping ones.
+ */
+static void
+ooo_segment_add (svm_fifo_t * f, u32 offset, u32 head, u32 tail, u32 length)
{
- int i, trace_len;
- u8 *data = 0;
- svm_fifo_trace_elem_t *trace;
- u32 offset;
- svm_fifo_t *dummy_fifo;
+ ooo_segment_t *s, *new_s, *prev, *next, *it;
+ u32 new_index, s_end_pos, s_index;
+ u32 offset_pos, offset_end_pos;
- if (!f)
- return s;
+ ASSERT (offset + length <= f_distance_to (f, head, tail) || head == tail);
-#if SVM_FIFO_TRACE
- trace = f->trace;
- trace_len = vec_len (trace);
-#else
- trace = 0;
- trace_len = 0;
-#endif
+ offset_pos = (tail + offset) % f->size;
+ offset_end_pos = (tail + offset + length) % f->size;
- dummy_fifo = svm_fifo_create (f->size);
- clib_memset (f->head_chunk->data, 0xFF, f->nitems);
- vec_validate (data, f->nitems);
- for (i = 0; i < vec_len (data); i++)
- data[i] = i;
+ f->ooos_newest = OOO_SEGMENT_INVALID_INDEX;
- for (i = 0; i < trace_len; i++)
+ if (f->ooos_list_head == OOO_SEGMENT_INVALID_INDEX)
{
- offset = trace[i].offset;
- if (trace[i].action == 1)
- {
- if (verbose)
- s = format (s, "adding [%u, %u]:", trace[i].offset,
- (trace[i].offset + trace[i].len) % dummy_fifo->size);
- svm_fifo_enqueue_with_offset (dummy_fifo, trace[i].offset,
- trace[i].len, &data[offset]);
- }
- else if (trace[i].action == 2)
+ s = ooo_segment_alloc (f, offset_pos, length);
+ f->ooos_list_head = s - f->ooo_segments;
+ f->ooos_newest = f->ooos_list_head;
+ return;
+ }
+
+ /* Find first segment that starts after new segment */
+ s = pool_elt_at_index (f->ooo_segments, f->ooos_list_head);
+ while (s->next != OOO_SEGMENT_INVALID_INDEX
+ && position_lt (f, s->start, offset_pos, tail))
+ s = pool_elt_at_index (f->ooo_segments, s->next);
+
+ /* If we have a previous and we overlap it, use it as starting point */
+ prev = ooo_segment_prev (f, s);
+ if (prev
+ && position_leq (f, offset_pos, ooo_segment_end_pos (f, prev), tail))
+ {
+ s = prev;
+ s_end_pos = ooo_segment_end_pos (f, s);
+
+ /* Since we have previous, offset start position cannot be smaller
+ * than prev->start. Check tail */
+ ASSERT (position_lt (f, s->start, offset_pos, tail));
+ goto check_tail;
+ }
+
+ s_index = s - f->ooo_segments;
+ s_end_pos = ooo_segment_end_pos (f, s);
+
+ /* No overlap, add before current segment */
+ if (position_lt (f, offset_end_pos, s->start, tail))
+ {
+ new_s = ooo_segment_alloc (f, offset_pos, length);
+ new_index = new_s - f->ooo_segments;
+
+ /* Pool might've moved, get segment again */
+ s = pool_elt_at_index (f->ooo_segments, s_index);
+ if (s->prev != OOO_SEGMENT_INVALID_INDEX)
{
- if (verbose)
- s = format (s, "adding [%u, %u]:", 0, trace[i].len);
- svm_fifo_enqueue_nowait (dummy_fifo, trace[i].len, &data[offset]);
+ new_s->prev = s->prev;
+ prev = pool_elt_at_index (f->ooo_segments, new_s->prev);
+ prev->next = new_index;
}
- else if (!no_read)
+ else
{
- if (verbose)
- s = format (s, "read: %u", trace[i].len);
- svm_fifo_dequeue_drop (dummy_fifo, trace[i].len);
+ /* New head */
+ f->ooos_list_head = new_index;
}
- if (verbose)
- s = format (s, "%U", format_svm_fifo, dummy_fifo, 1);
+
+ new_s->next = s_index;
+ s->prev = new_index;
+ f->ooos_newest = new_index;
+ return;
}
+ /* No overlap, add after current segment */
+ else if (position_gt (f, offset_pos, s_end_pos, tail))
+ {
+ new_s = ooo_segment_alloc (f, offset_pos, length);
+ new_index = new_s - f->ooo_segments;
- s = format (s, "result: %U", format_svm_fifo, dummy_fifo, 1);
+ /* Pool might've moved, get segment again */
+ s = pool_elt_at_index (f->ooo_segments, s_index);
- return s;
-}
+ /* Needs to be last */
+ ASSERT (s->next == OOO_SEGMENT_INVALID_INDEX);
-u8 *
-format_ooo_list (u8 * s, va_list * args)
-{
- svm_fifo_t *f = va_arg (*args, svm_fifo_t *);
- u32 indent = va_arg (*args, u32);
- u32 ooo_segment_index = f->ooos_list_head;
- ooo_segment_t *seg;
+ new_s->prev = s_index;
+ s->next = new_index;
+ f->ooos_newest = new_index;
- while (ooo_segment_index != OOO_SEGMENT_INVALID_INDEX)
+ return;
+ }
+
+ /*
+ * Merge needed
+ */
+
+ /* Merge at head */
+ if (position_lt (f, offset_pos, s->start, tail))
{
- seg = pool_elt_at_index (f->ooo_segments, ooo_segment_index);
- s = format (s, "%U%U\n", format_white_space, indent, format_ooo_segment,
- f, seg);
- ooo_segment_index = seg->next;
+ s->start = offset_pos;
+ s->length = position_diff (f, s_end_pos, s->start, tail);
+ f->ooos_newest = s - f->ooo_segments;
}
- return s;
+check_tail:
+
+ /* Overlapping tail */
+ if (position_gt (f, offset_end_pos, s_end_pos, tail))
+ {
+ s->length = position_diff (f, offset_end_pos, s->start, tail);
+
+ /* Remove the completely overlapped segments in the tail */
+ it = ooo_segment_next (f, s);
+ while (it && position_leq (f, ooo_segment_end_pos (f, it),
+ offset_end_pos, tail))
+ {
+ next = ooo_segment_next (f, it);
+ ooo_segment_free (f, it - f->ooo_segments);
+ it = next;
+ }
+
+ /* If partial overlap with last, merge */
+ if (it && position_leq (f, it->start, offset_end_pos, tail))
+ {
+ s->length = position_diff (f, ooo_segment_end_pos (f, it),
+ s->start, tail);
+ ooo_segment_free (f, it - f->ooo_segments);
+ }
+ f->ooos_newest = s - f->ooo_segments;
+ }
}
-u8 *
-format_svm_fifo (u8 * s, va_list * args)
+/**
+ * Removes segments that can now be enqueued because the fifo's tail has
+ * advanced. Returns the number of bytes added to tail.
+ */
+static int
+ooo_segment_try_collect (svm_fifo_t * f, u32 n_bytes_enqueued, u32 * tail)
{
- svm_fifo_t *f = va_arg (*args, svm_fifo_t *);
- int verbose = va_arg (*args, int);
- u32 indent;
+ u32 s_index, bytes = 0;
+ ooo_segment_t *s;
+ i32 diff;
- if (!s)
- return s;
+ s = pool_elt_at_index (f->ooo_segments, f->ooos_list_head);
+ diff = f_distance_from (f, s->start, *tail);
- 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, "%Uhead %u tail %u segment manager %u\n", format_white_space,
- indent, (f->head % f->size), (f->tail % f->size),
- f->segment_manager);
+ ASSERT (diff != n_bytes_enqueued);
+
+ if (diff > n_bytes_enqueued)
+ return 0;
+
+ /* If last tail update overlaps one/multiple ooo segments, remove them */
+ while (0 <= diff && diff < n_bytes_enqueued)
+ {
+ s_index = s - f->ooo_segments;
+
+ /* Segment end is beyond the tail. Advance tail and remove segment */
+ if (s->length > diff)
+ {
+ bytes = s->length - diff;
+ *tail = (*tail + bytes) % f->size;
+ ooo_segment_free (f, s_index);
+ break;
+ }
+
+ /* If we have next go on */
+ if (s->next != OOO_SEGMENT_INVALID_INDEX)
+ {
+ s = pool_elt_at_index (f->ooo_segments, s->next);
+ diff = f_distance_from (f, s->start, *tail);
+ ooo_segment_free (f, s_index);
+ }
+ /* End of search */
+ else
+ {
+ ooo_segment_free (f, s_index);
+ break;
+ }
+ }
+
+ ASSERT (bytes <= f->nitems);
+ return bytes;
+}
+
+static ooo_segment_t *
+ooo_segment_last (svm_fifo_t * f)
+{
+ ooo_segment_t *s;
- if (verbose > 1)
- s = format (s, "%Uvpp session %d thread %d app session %d thread %d\n",
- format_white_space, indent, f->master_session_index,
- f->master_thread_index, f->client_session_index,
- f->client_thread_index);
+ if (f->ooos_list_head == OOO_SEGMENT_INVALID_INDEX)
+ return 0;
- if (verbose)
- {
- s = format (s, "%Uooo pool %d active elts newest %u\n",
- format_white_space, indent, pool_elts (f->ooo_segments),
- f->ooos_newest);
- if (svm_fifo_has_ooo_data (f))
- s = format (s, " %U", format_ooo_list, f, indent, verbose);
- }
+ s = svm_fifo_first_ooo_segment (f);
+ while (s->next != OOO_SEGMENT_INVALID_INDEX)
+ s = pool_elt_at_index (f->ooo_segments, s->next);
return s;
}
*/
f->nitems = f->size - 1;
f->ooos_list_head = OOO_SEGMENT_INVALID_INDEX;
- f->ct_session_index = SVM_FIFO_INVALID_SESSION_INDEX;
f->segment_index = SVM_FIFO_INVALID_INDEX;
f->refcnt = 1;
- f->default_chunk.start_byte = 0;
- f->default_chunk.length = f->size;
- f->default_chunk.next = f->start_chunk = f->end_chunk = &f->default_chunk;
+ f->flags = 0;
f->head_chunk = f->tail_chunk = f->ooo_enq = f->ooo_deq = f->start_chunk;
}
-/** create an svm fifo, in the current heap. Fails vs blow up the process */
+/**
+ * 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_t *f;
u32 rounded_data_size;
+ svm_fifo_chunk_t *c;
+ svm_fifo_t *f;
- /* always round fifo data size to the next highest power-of-two */
- rounded_data_size = (1 << (max_log2 (data_size_in_bytes)));
- f = clib_mem_alloc_aligned_or_null (sizeof (*f) + rounded_data_size,
- CLIB_CACHE_LINE_BYTES);
+ f = clib_mem_alloc_aligned_or_null (sizeof (*f), CLIB_CACHE_LINE_BYTES);
if (f == 0)
return 0;
clib_memset (f, 0, sizeof (*f));
- svm_fifo_init (f, data_size_in_bytes);
- return f;
-}
-
-static inline void
-svm_fifo_size_update (svm_fifo_t * f, svm_fifo_chunk_t * c)
-{
- svm_fifo_chunk_t *prev;
- u32 add_bytes = 0;
+ /* always round fifo data size to the next highest power-of-two */
+ rounded_data_size = (1 << (max_log2 (data_size_in_bytes)));
+ c = clib_mem_alloc_aligned_or_null (sizeof (*c) + rounded_data_size,
+ CLIB_CACHE_LINE_BYTES);
if (!c)
- return;
-
- f->end_chunk->next = c;
- while (c)
{
- add_bytes += c->length;
- prev = c;
- c = c->next;
+ clib_mem_free (f);
+ return 0;
}
- 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_size_update (svm_fifo_t * f, u32 new_head)
-{
- if (new_head % f->size > f->tail % f->size)
- return;
+ c->next = c;
+ c->start_byte = 0;
+ c->length = data_size_in_bytes;
+ f->start_chunk = f->end_chunk = c;
- svm_fifo_size_update (f, f->new_chunks);
- f->flags &= ~SVM_FIFO_F_SIZE_UPDATE;
+ svm_fifo_init (f, data_size_in_bytes);
+ return f;
}
-void
-svm_fifo_add_chunk (svm_fifo_t * f, svm_fifo_chunk_t * c)
+/**
+ * Creates a fifo chunk in the current heap
+ */
+svm_fifo_chunk_t *
+svm_fifo_chunk_alloc (u32 size)
{
- svm_fifo_chunk_t *cur, *prev;
-
- /* Initialize rbtree if needed and add default chunk to it */
- if (!(f->flags & SVM_FIFO_F_MULTI_CHUNK))
- {
- rb_tree_init (&f->chunk_lookup);
- rb_tree_add2 (&f->chunk_lookup, 0, pointer_to_uword (f->start_chunk));
- f->flags |= SVM_FIFO_F_MULTI_CHUNK;
- }
-
- /* Initialize chunks and add to lookup rbtree. Expectation is that this is
- * called with the heap where the rbtree's pool is pushed. */
- 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;
- rb_tree_add2 (&f->chunk_lookup, cur->start_byte,
- pointer_to_uword (cur));
- prev = cur;
- cur = cur->next;
- }
+ svm_fifo_chunk_t *c;
+ u32 rounded_size;
- /* If fifo is not wrapped, update the size now */
- if (!svm_fifo_is_wrapped (f))
- {
- ASSERT (!f->new_chunks);
- svm_fifo_size_update (f, c);
- return;
- }
+ /* round chunk size to the next highest power-of-two */
+ rounded_size = (1 << (max_log2 (size)));
+ c = clib_mem_alloc_aligned_or_null (sizeof (*c) + rounded_size,
+ CLIB_CACHE_LINE_BYTES);
+ if (c == 0)
+ return 0;
- /* Postpone size update */
- if (!f->new_chunks)
- {
- f->new_chunks = c;
- f->flags |= SVM_FIFO_F_SIZE_UPDATE;
- }
+ clib_memset (c, 0, sizeof (*c));
+ c->length = rounded_size;
+ return c;
}
static inline u8
return c;
return 0;
}
- /* Hit tnil as a right child. Check if this is the one, otherwise
- * search for successor */
+ /* Hit tnil as a right child. Check if this is the one */
c = uword_to_pointer (prev->opaque, svm_fifo_chunk_t *);
if (svm_fifo_chunk_includes_pos (c, pos))
return c;
- cur = rb_tree_successor (rt, prev);
- c = uword_to_pointer (cur->opaque, svm_fifo_chunk_t *);
- if (svm_fifo_chunk_includes_pos (c, pos))
- return c;
return 0;
}
}
return 0;
}
-void
-svm_fifo_free (svm_fifo_t * f)
+static inline void
+svm_fifo_grow (svm_fifo_t * f, svm_fifo_chunk_t * c)
{
- ASSERT (f->refcnt > 0);
+ svm_fifo_chunk_t *prev;
+ u32 add_bytes = 0;
- if (--f->refcnt == 0)
+ if (!c)
+ return;
+
+ f->end_chunk->next = c;
+ while (c)
{
- pool_free (f->ooo_segments);
- clib_mem_free (f);
+ 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;
}
-always_inline ooo_segment_t *
-ooo_segment_new (svm_fifo_t * f, u32 start, u32 length)
+static void
+svm_fifo_try_grow (svm_fifo_t * f, u32 new_head)
{
- ooo_segment_t *s;
-
- pool_get (f->ooo_segments, s);
-
- s->start = start;
- s->length = length;
-
- s->prev = s->next = OOO_SEGMENT_INVALID_INDEX;
+ if (new_head > f->tail)
+ return;
- return s;
+ svm_fifo_grow (f, f->new_chunks);
+ f->flags &= ~SVM_FIFO_F_GROW;
}
-always_inline void
-ooo_segment_del (svm_fifo_t * f, u32 index)
+void
+svm_fifo_add_chunk (svm_fifo_t * f, svm_fifo_chunk_t * c)
{
- ooo_segment_t *cur, *prev = 0, *next = 0;
- cur = pool_elt_at_index (f->ooo_segments, index);
+ svm_fifo_chunk_t *cur, *prev;
- if (cur->next != OOO_SEGMENT_INVALID_INDEX)
+ /* 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))
{
- next = pool_elt_at_index (f->ooo_segments, cur->next);
- next->prev = cur->prev;
+ rb_tree_init (&f->chunk_lookup);
+ rb_tree_add2 (&f->chunk_lookup, 0, pointer_to_uword (f->start_chunk));
+ f->flags |= SVM_FIFO_F_MULTI_CHUNK;
}
- if (cur->prev != OOO_SEGMENT_INVALID_INDEX)
+ /* Initialize chunks and add to lookup rbtree */
+ cur = c;
+ if (f->new_chunks)
{
- prev = pool_elt_at_index (f->ooo_segments, cur->prev);
- prev->next = cur->next;
+ prev = f->new_chunks;
+ while (prev->next)
+ prev = prev->next;
+ prev->next = c;
}
else
- {
- f->ooos_list_head = cur->next;
- }
-
- pool_put (f->ooo_segments, cur);
-}
-
-/**
- * Add segment to fifo's out-of-order segment list. Takes care of merging
- * adjacent segments and removing overlapping ones.
- */
-static void
-ooo_segment_add (svm_fifo_t * f, u32 offset, u32 head, u32 tail, u32 length)
-{
- ooo_segment_t *s, *new_s, *prev, *next, *it;
- u32 new_index, s_end_pos, s_index;
- u32 offset_pos, offset_end_pos;
-
- ASSERT (offset + length <= ooo_segment_distance_from_tail (f, head, tail)
- || head == tail);
-
- offset_pos = tail + offset;
- offset_end_pos = tail + offset + length;
-
- f->ooos_newest = OOO_SEGMENT_INVALID_INDEX;
+ prev = f->end_chunk;
- if (f->ooos_list_head == OOO_SEGMENT_INVALID_INDEX)
+ while (cur)
{
- s = ooo_segment_new (f, offset_pos, length);
- f->ooos_list_head = s - f->ooo_segments;
- f->ooos_newest = f->ooos_list_head;
- return;
+ cur->start_byte = prev->start_byte + prev->length;
+ rb_tree_add2 (&f->chunk_lookup, cur->start_byte,
+ pointer_to_uword (cur));
+ prev = cur;
+ cur = cur->next;
}
- /* Find first segment that starts after new segment */
- s = pool_elt_at_index (f->ooo_segments, f->ooos_list_head);
- while (s->next != OOO_SEGMENT_INVALID_INDEX
- && position_lt (f, s->start, offset_pos, tail))
- s = pool_elt_at_index (f->ooo_segments, s->next);
-
- /* If we have a previous and we overlap it, use it as starting point */
- prev = ooo_segment_get_prev (f, s);
- if (prev
- && position_leq (f, offset_pos, ooo_segment_end_pos (f, prev), tail))
+ /* If fifo is not wrapped, update the size now */
+ if (!svm_fifo_is_wrapped (f))
{
- s = prev;
- s_end_pos = ooo_segment_end_pos (f, s);
-
- /* Since we have previous, offset start position cannot be smaller
- * than prev->start. Check tail */
- ASSERT (position_lt (f, s->start, offset_pos, tail));
- goto check_tail;
+ ASSERT (!f->new_chunks);
+ svm_fifo_grow (f, c);
+ return;
}
- s_index = s - f->ooo_segments;
- s_end_pos = ooo_segment_end_pos (f, s);
-
- /* No overlap, add before current segment */
- if (position_lt (f, offset_end_pos, s->start, tail))
+ /* Postpone size update */
+ if (!f->new_chunks)
{
- new_s = ooo_segment_new (f, offset_pos, length);
- new_index = new_s - f->ooo_segments;
-
- /* Pool might've moved, get segment again */
- s = pool_elt_at_index (f->ooo_segments, s_index);
- if (s->prev != OOO_SEGMENT_INVALID_INDEX)
- {
- new_s->prev = s->prev;
- prev = pool_elt_at_index (f->ooo_segments, new_s->prev);
- prev->next = new_index;
- }
- else
- {
- /* New head */
- f->ooos_list_head = new_index;
- }
-
- new_s->next = s_index;
- s->prev = new_index;
- f->ooos_newest = new_index;
- return;
+ f->new_chunks = c;
+ f->flags |= SVM_FIFO_F_GROW;
}
- /* No overlap, add after current segment */
- else if (position_gt (f, offset_pos, s_end_pos, tail))
- {
- new_s = ooo_segment_new (f, offset_pos, length);
- new_index = new_s - f->ooo_segments;
-
- /* Pool might've moved, get segment again */
- s = pool_elt_at_index (f->ooo_segments, s_index);
+}
- /* Needs to be last */
- ASSERT (s->next == OOO_SEGMENT_INVALID_INDEX);
+/**
+ * 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;
- new_s->prev = s_index;
- s->next = new_index;
- f->ooos_newest = new_index;
+ f->flags &= ~SVM_FIFO_F_COLLECT_CHUNKS;
- return;
+ list = f->new_chunks;
+ f->new_chunks = 0;
+ cur = list;
+ while (cur)
+ {
+ rb_tree_del (&f->chunk_lookup, cur->start_byte);
+ cur = cur->next;
}
- /*
- * Merge needed
- */
+ return list;
+}
- /* Merge at head */
- if (position_lt (f, offset_pos, s->start, tail))
+void
+svm_fifo_try_shrink (svm_fifo_t * f, u32 head, u32 tail)
+{
+ u32 len_to_shrink = 0, tail_pos, len;
+ svm_fifo_chunk_t *cur, *prev, *next, *start;
+
+ tail_pos = tail;
+ if (f->ooos_list_head != OOO_SEGMENT_INVALID_INDEX)
{
- s->start = offset_pos;
- s->length = position_diff (f, s_end_pos, s->start, tail);
- f->ooos_newest = s - f->ooo_segments;
+ ooo_segment_t *last = ooo_segment_last (f);
+ tail_pos = ooo_segment_end_pos (f, last);
}
-check_tail:
-
- /* Overlapping tail */
- if (position_gt (f, offset_end_pos, s_end_pos, tail))
+ if (f->size_decrement)
{
- s->length = position_diff (f, offset_end_pos, s->start, tail);
+ /* 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 the completely overlapped segments in the tail */
- it = ooo_segment_next (f, s);
- while (it && position_leq (f, ooo_segment_end_pos (f, it),
- offset_end_pos, tail))
+ /* 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 */
+ tail_pos = tail_pos > 0 ? tail_pos - 1 : tail_pos;
+ prev = svm_fifo_find_chunk (f, clib_max (f->nitems, tail_pos));
+ next = prev->next;
+ while (next != f->start_chunk)
{
- next = ooo_segment_next (f, it);
- ooo_segment_del (f, it - f->ooo_segments);
- it = next;
+ cur = next;
+ next = cur->next;
+ len_to_shrink += cur->length;
}
-
- /* If partial overlap with last, merge */
- if (it && position_leq (f, it->start, offset_end_pos, tail))
+ if (len_to_shrink)
{
- s->length = position_diff (f, ooo_segment_end_pos (f, it),
- s->start, tail);
- ooo_segment_del (f, it - f->ooo_segments);
+ 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;
}
- f->ooos_newest = s - f->ooo_segments;
+ }
+
+ 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;
}
}
/**
- * Removes segments that can now be enqueued because the fifo's tail has
- * advanced. Returns the number of bytes added to tail.
+ * Request to reduce fifo size by amount of bytes
*/
-static int
-ooo_segment_try_collect (svm_fifo_t * f, u32 n_bytes_enqueued, u32 * tail)
+int
+svm_fifo_reduce_size (svm_fifo_t * f, u32 len, u8 try_shrink)
{
- ooo_segment_t *s;
- u32 index, bytes = 0;
- i32 diff;
+ svm_fifo_chunk_t *cur;
+ u32 actual_len = 0;
- s = pool_elt_at_index (f->ooo_segments, f->ooos_list_head);
- diff = ooo_segment_distance_to_tail (f, s->start, *tail);
+ /* 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;
- ASSERT (diff != n_bytes_enqueued);
+ /* last chunk that will not be removed */
+ cur = svm_fifo_find_chunk (f, f->nitems - len);
- if (diff > n_bytes_enqueued)
+ /* sum length of chunks that will be removed */
+ cur = cur->next;
+ while (cur != f->start_chunk)
+ {
+ actual_len += cur->length;
+ cur = cur->next;
+ }
+
+ ASSERT (actual_len <= len);
+ if (!actual_len)
return 0;
- /* If last tail update overlaps one/multiple ooo segments, remove them */
- while (0 <= diff && diff < n_bytes_enqueued)
+ f->size_decrement = actual_len;
+ f->flags |= SVM_FIFO_F_SHRINK;
+
+ if (try_shrink)
{
- index = s - f->ooo_segments;
+ u32 head, tail;
+ f_load_head_tail_prod (f, &head, &tail);
+ svm_fifo_try_shrink (f, head, tail);
+ }
- /* Segment end is beyond the tail. Advance tail and remove segment */
- if (s->length > diff)
- {
- bytes = s->length - diff;
- *tail = *tail + bytes;
- ooo_segment_del (f, index);
- break;
- }
+ return actual_len;
+}
- /* If we have next go on */
- if (s->next != OOO_SEGMENT_INVALID_INDEX)
- {
- s = pool_elt_at_index (f->ooo_segments, s->next);
- diff = ooo_segment_distance_to_tail (f, s->start, *tail);
- ooo_segment_del (f, index);
- }
- /* End of search */
- else
- {
- ooo_segment_del (f, index);
- break;
- }
- }
+void
+svm_fifo_free_chunk_lookup (svm_fifo_t * f)
+{
+ rb_tree_free_nodes (&f->chunk_lookup);
+}
- ASSERT (bytes <= f->nitems);
- return bytes;
+void
+svm_fifo_free (svm_fifo_t * f)
+{
+ ASSERT (f->refcnt > 0);
+
+ if (--f->refcnt == 0)
+ {
+ /* ooo data is not allocated on segment heap */
+ svm_fifo_free_chunk_lookup (f);
+ clib_mem_free (f);
+ }
}
void
-svm_fifo_overwrite_head (svm_fifo_t * f, u8 * data, u32 len)
+svm_fifo_overwrite_head (svm_fifo_t * f, u8 * src, u32 len)
{
u32 n_chunk;
u32 head, tail, head_idx;
f_load_head_tail_cons (f, &head, &tail);
c = f->head_chunk;
- head_idx = head % f->size;
- head_idx -= c->start_byte;
+ head_idx = head - c->start_byte;
n_chunk = c->length - head_idx;
if (len <= n_chunk)
- clib_memcpy_fast (&c->data[head_idx], data, len);
+ clib_memcpy_fast (&c->data[head_idx], src, len);
else
{
- clib_memcpy_fast (&c->data[head_idx], data, n_chunk);
- clib_memcpy_fast (&c->next->data[0], data + n_chunk, len - n_chunk);
+ clib_memcpy_fast (&c->data[head_idx], src, n_chunk);
+ clib_memcpy_fast (&c->next->data[0], src + n_chunk, len - n_chunk);
}
}
int
-svm_fifo_enqueue_nowait (svm_fifo_t * f, u32 len, const u8 * src)
+svm_fifo_enqueue (svm_fifo_t * f, u32 len, const u8 * src)
{
u32 tail, head, free_count;
f->ooos_newest = OOO_SEGMENT_INVALID_INDEX;
if (PREDICT_FALSE (free_count == 0))
- return SVM_FIFO_FULL;
+ return SVM_FIFO_EFULL;
/* number of bytes we're going to copy */
len = clib_min (free_count, len);
+ svm_fifo_copy_to_chunk (f, f->tail_chunk, tail, src, len, &f->tail_chunk);
+ tail = (tail + len) % f->size;
- svm_fifo_copy_to_chunk (f, f->tail_chunk, tail % f->size, src, len,
- &f->tail_chunk);
- tail += len;
-
- svm_fifo_trace_add (f, head, n_total, 2);
+ svm_fifo_trace_add (f, head, len, 2);
/* collect out-of-order segments */
if (PREDICT_FALSE (f->ooos_list_head != OOO_SEGMENT_INVALID_INDEX))
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);
/* will this request fit? */
if ((len + offset) > free_count)
- return -1;
+ return SVM_FIFO_EFULL;
f->ooos_newest = OOO_SEGMENT_INVALID_INDEX;
-
svm_fifo_trace_add (f, offset, len, 1);
-
ooo_segment_add (f, offset, head, tail, len);
-
tail_idx = (tail + offset) % f->size;
if (!svm_fifo_chunk_includes_pos (f->ooo_enq, tail_idx))
return 0;
}
+/**
+ * Advance tail
+ */
+void
+svm_fifo_enqueue_nocopy (svm_fifo_t * f, u32 len)
+{
+ u32 tail;
+
+ ASSERT (len <= svm_fifo_max_enqueue_prod (f));
+ /* load-relaxed: producer owned index */
+ tail = f->tail;
+ tail = (tail + len) % f->size;
+ /* store-rel: producer owned index (paired with load-acq in consumer) */
+ clib_atomic_store_rel_n (&f->tail, tail);
+}
+
int
-svm_fifo_dequeue_nowait (svm_fifo_t * f, u32 len, u8 * dst)
+svm_fifo_dequeue (svm_fifo_t * f, u32 len, u8 * dst)
{
u32 tail, head, cursize;
cursize = f_cursize (f, head, tail);
if (PREDICT_FALSE (cursize == 0))
- return -2; /* nothing in the fifo */
+ return SVM_FIFO_EEMPTY;
len = clib_min (cursize, len);
+ svm_fifo_copy_from_chunk (f, f->head_chunk, head, dst, len, &f->head_chunk);
+ head = (head + len) % f->size;
- svm_fifo_copy_from_chunk (f, f->head_chunk, head % f->size, dst, len,
- &f->head_chunk);
- head += len;
-
- if (PREDICT_FALSE (f->flags & SVM_FIFO_F_SIZE_UPDATE))
- svm_fifo_try_size_update (f, head);
+ if (PREDICT_FALSE (f->flags & SVM_FIFO_F_GROW))
+ svm_fifo_try_grow (f, head);
/* store-rel: consumer owned index (paired with load-acq in producer) */
clib_atomic_store_rel_n (&f->head, head);
cursize = f_cursize (f, head, tail);
if (PREDICT_FALSE (cursize < offset))
- return -2; /* nothing in the fifo */
+ return SVM_FIFO_EEMPTY;
len = clib_min (cursize - offset, len);
head_idx = (head + offset) % f->size;
}
int
-svm_fifo_dequeue_drop (svm_fifo_t * f, u32 max_bytes)
+svm_fifo_dequeue_drop (svm_fifo_t * f, u32 len)
{
- u32 total_drop_bytes;
- u32 tail, head, cursize;
+ u32 total_drop_bytes, tail, head, cursize;
f_load_head_tail_cons (f, &head, &tail);
- /* number of bytes we're going to drop */
+ /* number of bytes available */
cursize = f_cursize (f, head, tail);
-
if (PREDICT_FALSE (cursize == 0))
- return -2; /* nothing in the fifo */
+ return SVM_FIFO_EEMPTY;
svm_fifo_trace_add (f, tail, total_drop_bytes, 3);
/* number of bytes we're going to drop */
- total_drop_bytes = (cursize < max_bytes) ? cursize : max_bytes;
+ total_drop_bytes = clib_min (cursize, len);
/* move head */
- head += total_drop_bytes;
+ head = (head + total_drop_bytes) % f->size;
- ASSERT (cursize >= total_drop_bytes);
/* store-rel: consumer owned index (paired with load-acq in producer) */
clib_atomic_store_rel_n (&f->head, head);
}
int
-svm_fifo_segments (svm_fifo_t * f, svm_fifo_segment_t * fs)
+svm_fifo_segments (svm_fifo_t * f, svm_fifo_seg_t * fs)
{
u32 cursize, head, tail, head_idx;
cursize = f_cursize (f, head, tail);
if (PREDICT_FALSE (cursize == 0))
- return -2; /* nothing in the fifo */
+ return SVM_FIFO_EEMPTY;
- head_idx = head % f->size;
+ head_idx = head;
if (tail < head)
{
}
void
-svm_fifo_segments_free (svm_fifo_t * f, svm_fifo_segment_t * fs)
+svm_fifo_segments_free (svm_fifo_t * f, svm_fifo_seg_t * fs)
{
- u32 head, head_idx;
+ u32 head;
/* consumer owned index */
head = f->head;
- head_idx = head % f->size;
- ASSERT (fs[0].data == f->head_chunk->data + head_idx);
- head += fs[0].len + fs[1].len;
+ ASSERT (fs[0].data == f->head_chunk->data + head);
+ head = (head + fs[0].len + fs[1].len) % f->size;
/* store-rel: consumer owned index (paired with load-acq in producer) */
clib_atomic_store_rel_n (&f->head, head);
}
-/* Assumption: no prod and cons are accessing either dest or src fifo */
+/**
+ * Clones fifo
+ *
+ * Assumptions:
+ * - no prod and cons are accessing either dest or src fifo
+ * - fifo is not multi chunk
+ */
void
svm_fifo_clone (svm_fifo_t * df, svm_fifo_t * sf)
{
}
u32
-svm_fifo_number_ooo_segments (svm_fifo_t * f)
+svm_fifo_n_ooo_segments (svm_fifo_t * f)
{
return pool_elts (f->ooo_segments);
}
void
svm_fifo_init_pointers (svm_fifo_t * f, u32 head, u32 tail)
{
+ head = head % f->size;
+ tail = tail % f->size;
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 % f->size);
+ c = svm_fifo_find_chunk (f, head);
ASSERT (c != 0);
f->head_chunk = f->ooo_deq = c;
- c = svm_fifo_find_chunk (f, tail % f->size);
+ c = svm_fifo_find_chunk (f, tail);
ASSERT (c != 0);
f->tail_chunk = f->ooo_enq = c;
}
}
}
+u8 *
+format_ooo_segment (u8 * s, va_list * args)
+{
+ svm_fifo_t *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);
+ return s;
+}
+
+u8 *
+svm_fifo_dump_trace (u8 * s, svm_fifo_t * f)
+{
+#if SVM_FIFO_TRACE
+ svm_fifo_trace_elem_t *seg = 0;
+ int i = 0;
+
+ if (f->trace)
+ {
+ vec_foreach (seg, f->trace)
+ {
+ s = format (s, "{%u, %u, %u}, ", seg->offset, seg->len, seg->action);
+ i++;
+ if (i % 5 == 0)
+ s = format (s, "\n");
+ }
+ s = format (s, "\n");
+ }
+ return s;
+#else
+ return 0;
+#endif
+}
+
+u8 *
+svm_fifo_replay (u8 * s, svm_fifo_t * f, u8 no_read, u8 verbose)
+{
+ int i, trace_len;
+ u8 *data = 0;
+ svm_fifo_trace_elem_t *trace;
+ u32 offset;
+ svm_fifo_t *dummy_fifo;
+
+ if (!f)
+ return s;
+
+#if SVM_FIFO_TRACE
+ trace = f->trace;
+ trace_len = vec_len (trace);
+#else
+ trace = 0;
+ 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);
+ for (i = 0; i < vec_len (data); i++)
+ data[i] = i;
+
+ for (i = 0; i < trace_len; i++)
+ {
+ offset = trace[i].offset;
+ if (trace[i].action == 1)
+ {
+ if (verbose)
+ s = format (s, "adding [%u, %u]:", trace[i].offset,
+ (trace[i].offset + trace[i].len) % dummy_fifo->size);
+ svm_fifo_enqueue_with_offset (dummy_fifo, trace[i].offset,
+ trace[i].len, &data[offset]);
+ }
+ else if (trace[i].action == 2)
+ {
+ if (verbose)
+ s = format (s, "adding [%u, %u]:", 0, trace[i].len);
+ svm_fifo_enqueue (dummy_fifo, trace[i].len, &data[offset]);
+ }
+ else if (!no_read)
+ {
+ if (verbose)
+ s = format (s, "read: %u", trace[i].len);
+ svm_fifo_dequeue_drop (dummy_fifo, trace[i].len);
+ }
+ if (verbose)
+ s = format (s, "%U", format_svm_fifo, dummy_fifo, 1);
+ }
+
+ s = format (s, "result: %U", format_svm_fifo, dummy_fifo, 1);
+
+ return s;
+}
+
+u8 *
+format_ooo_list (u8 * s, va_list * args)
+{
+ svm_fifo_t *f = va_arg (*args, svm_fifo_t *);
+ u32 indent = va_arg (*args, u32);
+ u32 ooo_segment_index = f->ooos_list_head;
+ ooo_segment_t *seg;
+
+ while (ooo_segment_index != OOO_SEGMENT_INVALID_INDEX)
+ {
+ seg = pool_elt_at_index (f->ooo_segments, ooo_segment_index);
+ s = format (s, "%U%U\n", format_white_space, indent, format_ooo_segment,
+ f, seg);
+ ooo_segment_index = seg->next;
+ }
+
+ return s;
+}
+
+u8 *
+format_svm_fifo (u8 * s, va_list * args)
+{
+ svm_fifo_t *f = va_arg (*args, svm_fifo_t *);
+ int verbose = va_arg (*args, int);
+ u32 indent;
+
+ if (!s)
+ 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, "%Uhead %u tail %u segment manager %u\n", format_white_space,
+ indent, (f->head % f->size), (f->tail % f->size),
+ f->segment_manager);
+
+ if (verbose > 1)
+ s = format (s, "%Uvpp session %d thread %d app session %d thread %d\n",
+ format_white_space, indent, f->master_session_index,
+ f->master_thread_index, f->client_session_index,
+ f->client_thread_index);
+
+ if (verbose)
+ {
+ s = format (s, "%Uooo pool %d active elts newest %u\n",
+ format_white_space, indent, pool_elts (f->ooo_segments),
+ f->ooos_newest);
+ if (svm_fifo_has_ooo_data (f))
+ s = format (s, " %U", format_ooo_list, f, indent, verbose);
+ }
+ return s;
+}
+
#endif
/*
* fd.io coding-style-patch-verification: ON
Code Review / vpp.git / blobdiff