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-rw-r--r--src/svm/svm_fifo.c345
1 files changed, 176 insertions, 169 deletions
diff --git a/src/svm/svm_fifo.c b/src/svm/svm_fifo.c
index 41cd752914a..f457128ffaa 100644
--- a/src/svm/svm_fifo.c
+++ b/src/svm/svm_fifo.c
@@ -20,6 +20,80 @@
#include <svm/svm_fifo.h>
#include <vppinfra/cpu.h>
+CLIB_MARCH_FN (svm_fifo_copy_to_chunk, void, svm_fifo_t * f,
+ svm_fifo_chunk_t * c, u32 tail_idx, const u8 * src, u32 len,
+ u8 update_tail)
+{
+ u32 n_chunk;
+
+ ASSERT (tail_idx >= c->start_byte && tail_idx < c->start_byte + c->length);
+
+ tail_idx -= c->start_byte;
+ n_chunk = c->length - tail_idx;
+ if (n_chunk < len)
+ {
+ u32 to_copy = len;
+ clib_memcpy_fast (&c->data[tail_idx], src, n_chunk);
+ while ((to_copy -= n_chunk))
+ {
+ c = c->next;
+ n_chunk = clib_min (c->length, to_copy);
+ clib_memcpy_fast (&c->data[0], src + (len - to_copy), n_chunk);
+ }
+ if (update_tail)
+ f->tail_chunk = c;
+ }
+ else
+ {
+ clib_memcpy_fast (&c->data[tail_idx], src, len);
+ }
+}
+
+CLIB_MARCH_FN (svm_fifo_copy_from_chunk, void, svm_fifo_t * f,
+ svm_fifo_chunk_t * c, u32 head_idx, u8 * dst, u32 len,
+ u8 update_head)
+{
+ u32 n_chunk;
+
+ head_idx -= c->start_byte;
+ n_chunk = c->length - head_idx;
+ if (n_chunk < len)
+ {
+ u32 to_copy = len;
+ clib_memcpy_fast (dst, &c->data[head_idx], n_chunk);
+ while ((to_copy -= n_chunk))
+ {
+ c = c->next;
+ n_chunk = clib_min (c->length, to_copy);
+ clib_memcpy_fast (dst + (len - to_copy), &c->data[0], n_chunk);
+ }
+ if (update_head)
+ f->head_chunk = c;
+ }
+ else
+ {
+ clib_memcpy_fast (dst, &c->data[head_idx], len);
+ }
+}
+
+#ifndef CLIB_MARCH_VARIANT
+
+static inline void
+svm_fifo_copy_to_chunk (svm_fifo_t * f, svm_fifo_chunk_t * c, u32 tail_idx,
+ const u8 * src, u32 len, u8 update_tail)
+{
+ CLIB_MARCH_FN_SELECT (svm_fifo_copy_to_chunk) (f, c, tail_idx, src, len,
+ update_tail);
+}
+
+static inline void
+svm_fifo_copy_from_chunk (svm_fifo_t * f, svm_fifo_chunk_t * c, u32 head_idx,
+ u8 * dst, u32 len, u8 update_head)
+{
+ CLIB_MARCH_FN_SELECT (svm_fifo_copy_from_chunk) (f, c, head_idx, dst, len,
+ update_head);
+}
+
static inline u8
position_lt (svm_fifo_t * f, u32 a, u32 b, u32 tail)
{
@@ -54,8 +128,6 @@ ooo_segment_end_pos (svm_fifo_t * f, ooo_segment_t * s)
return s->start + s->length;
}
-#ifndef CLIB_MARCH_VARIANT
-
u8 *
format_ooo_segment (u8 * s, va_list * args)
{
@@ -241,6 +313,63 @@ svm_fifo_create (u32 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;
+
+ prev = f->end_chunk;
+ while (c)
+ {
+ c->start_byte = prev->start_byte + prev->length;
+ add_bytes += c->length;
+ prev->next = c;
+ 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_size_update (svm_fifo_t * f, u32 new_head)
+{
+ if (new_head % f->size > f->tail % f->size)
+ return;
+
+ svm_fifo_size_update (f, f->new_chunks);
+ f->flags &= ~SVM_FIFO_F_SIZE_UPDATE;
+}
+
+void
+svm_fifo_add_chunk (svm_fifo_t * f, svm_fifo_chunk_t * c)
+{
+ if (svm_fifo_is_wrapped (f))
+ {
+ if (f->new_chunks)
+ {
+ svm_fifo_chunk_t *prev;
+
+ prev = f->new_chunks;
+ while (prev->next)
+ prev = prev->next;
+ prev->next = c;
+ }
+ else
+ {
+ f->new_chunks = c;
+ }
+ f->flags |= SVM_FIFO_F_SIZE_UPDATE;
+ return;
+ }
+
+ svm_fifo_size_update (f, c);
+}
+
void
svm_fifo_free (svm_fifo_t * f)
{
@@ -252,7 +381,6 @@ svm_fifo_free (svm_fifo_t * f)
clib_mem_free (f);
}
}
-#endif
always_inline ooo_segment_t *
ooo_segment_new (svm_fifo_t * f, u32 start, u32 length)
@@ -480,12 +608,34 @@ ooo_segment_try_collect (svm_fifo_t * f, u32 n_bytes_enqueued, u32 * tail)
return bytes;
}
-CLIB_MARCH_FN (svm_fifo_enqueue_nowait, int, svm_fifo_t * f, u32 len,
- const u8 * src)
+void
+svm_fifo_overwrite_head (svm_fifo_t * f, u8 * data, u32 len)
{
- u32 n_chunk, to_copy, tail, head, free_count, tail_idx;
+ u32 n_chunk;
+ u32 head, tail, head_idx;
svm_fifo_chunk_t *c;
+ ASSERT (len <= f->nitems);
+
+ f_load_head_tail_cons (f, &head, &tail);
+ c = f->head_chunk;
+ head_idx = head % f->size;
+ head_idx -= c->start_byte;
+ n_chunk = c->length - head_idx;
+ if (len <= n_chunk)
+ clib_memcpy_fast (&c->data[head_idx], data, 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);
+ }
+}
+
+int
+svm_fifo_enqueue_nowait (svm_fifo_t * f, u32 len, const u8 * src)
+{
+ u32 tail, head, free_count;
+
f_load_head_tail_prod (f, &head, &tail);
/* free space in fifo can only increase during enqueue: SPSC */
@@ -497,29 +647,10 @@ CLIB_MARCH_FN (svm_fifo_enqueue_nowait, int, svm_fifo_t * f, u32 len,
return SVM_FIFO_FULL;
/* number of bytes we're going to copy */
- to_copy = len = clib_min (free_count, len);
+ len = clib_min (free_count, len);
- c = f->tail_chunk;
- tail_idx = tail % f->size;
- ASSERT (tail_idx >= c->start_byte);
- tail_idx -= c->start_byte;
- n_chunk = c->length - tail_idx;
-
- if (n_chunk < to_copy)
- {
- clib_memcpy_fast (&c->data[tail_idx], src, n_chunk);
- while ((to_copy -= n_chunk))
- {
- c = c->next;
- n_chunk = clib_min (c->length, to_copy);
- clib_memcpy_fast (&c->data[0], src + (len - to_copy), n_chunk);
- }
- f->tail_chunk = c;
- }
- else
- {
- clib_memcpy_fast (&c->data[tail_idx], src, to_copy);
- }
+ svm_fifo_copy_to_chunk (f, f->tail_chunk, tail % f->size, src, len,
+ 1 /* update tail */ );
tail += len;
svm_fifo_trace_add (f, head, n_total, 2);
@@ -528,24 +659,12 @@ CLIB_MARCH_FN (svm_fifo_enqueue_nowait, int, svm_fifo_t * f, u32 len,
if (PREDICT_FALSE (f->ooos_list_head != OOO_SEGMENT_INVALID_INDEX))
len += ooo_segment_try_collect (f, len, &tail);
- ASSERT (len <= free_count);
-
/* store-rel: producer owned index (paired with load-acq in consumer) */
clib_atomic_store_rel_n (&f->tail, tail);
return len;
}
-#ifndef CLIB_MARCH_VARIANT
-int
-svm_fifo_enqueue_nowait (svm_fifo_t * f, u32 max_bytes,
- const u8 * copy_from_here)
-{
- return CLIB_MARCH_FN_SELECT (svm_fifo_enqueue_nowait) (f, max_bytes,
- copy_from_here);
-}
-#endif
-
/**
* Enqueue a future segment.
*
@@ -553,11 +672,10 @@ svm_fifo_enqueue_nowait (svm_fifo_t * f, u32 max_bytes,
* Returns 0 of the entire segment was copied
* Returns -1 if none of the segment was copied due to lack of space
*/
-CLIB_MARCH_FN (svm_fifo_enqueue_with_offset, int, svm_fifo_t * f,
- u32 offset, u32 len, u8 * src)
+int
+svm_fifo_enqueue_with_offset (svm_fifo_t * f, u32 offset, u32 len, u8 * src)
{
- u32 to_copy, n_chunk, tail, head, free_count, tail_offset_idx;
- svm_fifo_chunk_t *c;
+ u32 tail, head, free_count;
f_load_head_tail_prod (f, &head, &tail);
@@ -570,75 +688,20 @@ CLIB_MARCH_FN (svm_fifo_enqueue_with_offset, int, svm_fifo_t * f,
f->ooos_newest = OOO_SEGMENT_INVALID_INDEX;
- ASSERT (len < f->nitems);
svm_fifo_trace_add (f, offset, len, 1);
ooo_segment_add (f, offset, head, tail, len);
- c = f->tail_chunk;
- tail_offset_idx = (tail + offset) % f->size;
- tail_offset_idx -= c->start_byte;
- n_chunk = c->length - tail_offset_idx;
- to_copy = len;
-
- if (n_chunk < to_copy)
- {
- clib_memcpy_fast (&c->data[tail_offset_idx], src, n_chunk);
- while ((to_copy -= n_chunk))
- {
- c = c->next;
- n_chunk = clib_min (c->length, to_copy);
- clib_memcpy_fast (&c->data[0], src + (len - to_copy), n_chunk);
- }
- }
- else
- {
- clib_memcpy_fast (&c->data[tail_offset_idx], src, len);
- }
+ svm_fifo_copy_to_chunk (f, f->tail_chunk, (tail + offset) % f->size, src,
+ len, 0 /* update tail */ );
return 0;
}
-#ifndef CLIB_MARCH_VARIANT
-
int
-svm_fifo_enqueue_with_offset (svm_fifo_t * f, u32 offset, u32 required_bytes,
- u8 * copy_from_here)
-{
- return CLIB_MARCH_FN_SELECT (svm_fifo_enqueue_with_offset) (f, offset,
- required_bytes,
- copy_from_here);
-}
-
-void
-svm_fifo_overwrite_head (svm_fifo_t * f, u8 * data, u32 len)
+svm_fifo_dequeue_nowait (svm_fifo_t * f, u32 len, u8 * dst)
{
- u32 n_chunk;
- u32 head, tail, head_idx;
- svm_fifo_chunk_t *c;
-
- ASSERT (len <= f->nitems);
-
- f_load_head_tail_cons (f, &head, &tail);
- c = f->head_chunk;
- head_idx = head % f->size;
- head_idx -= c->start_byte;
- n_chunk = c->length - head_idx;
- if (len <= n_chunk)
- clib_memcpy_fast (&c->data[head_idx], data, 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);
- }
-}
-#endif
-
-CLIB_MARCH_FN (svm_fifo_dequeue_nowait, int, svm_fifo_t * f, u32 len,
- u8 * dst)
-{
- u32 to_copy, n_chunk, tail, head, cursize, head_idx;
- svm_fifo_chunk_t *c;
+ u32 tail, head, cursize;
f_load_head_tail_cons (f, &head, &tail);
@@ -648,29 +711,11 @@ CLIB_MARCH_FN (svm_fifo_dequeue_nowait, int, svm_fifo_t * f, u32 len,
if (PREDICT_FALSE (cursize == 0))
return -2; /* nothing in the fifo */
- to_copy = len = clib_min (cursize, len);
- ASSERT (cursize >= to_copy);
-
- c = f->head_chunk;
- head_idx = head % f->size;
- head_idx -= c->start_byte;
- n_chunk = c->length - head_idx;
+ len = clib_min (cursize, len);
+ ASSERT (cursize >= len);
- if (n_chunk < to_copy)
- {
- clib_memcpy_fast (dst, &c->data[head_idx], n_chunk);
- while ((to_copy -= n_chunk))
- {
- c = c->next;
- n_chunk = clib_min (c->length, to_copy);
- clib_memcpy_fast (dst + (len - to_copy), &c->data[0], n_chunk);
- }
- f->head_chunk = c;
- }
- else
- {
- clib_memcpy_fast (dst, &c->data[head_idx], to_copy);
- }
+ svm_fifo_copy_from_chunk (f, f->head_chunk, head % f->size, dst, len,
+ 1 /* update head */ );
head += len;
if (PREDICT_FALSE (f->flags & SVM_FIFO_F_SIZE_UPDATE))
@@ -682,21 +727,10 @@ CLIB_MARCH_FN (svm_fifo_dequeue_nowait, int, svm_fifo_t * f, u32 len,
return len;
}
-#ifndef CLIB_MARCH_VARIANT
-
int
-svm_fifo_dequeue_nowait (svm_fifo_t * f, u32 max_bytes, u8 * copy_here)
+svm_fifo_peek (svm_fifo_t * f, u32 relative_offset, u32 len, u8 * dst)
{
- return CLIB_MARCH_FN_SELECT (svm_fifo_dequeue_nowait) (f, max_bytes,
- copy_here);
-}
-#endif
-
-CLIB_MARCH_FN (svm_fifo_peek, int, svm_fifo_t * f, u32 relative_offset,
- u32 len, u8 * dst)
-{
- u32 to_copy, n_chunk, tail, head, cursize, head_idx;
- svm_fifo_chunk_t *c;
+ u32 tail, head, cursize;
f_load_head_tail_cons (f, &head, &tail);
@@ -706,41 +740,14 @@ CLIB_MARCH_FN (svm_fifo_peek, int, svm_fifo_t * f, u32 relative_offset,
if (PREDICT_FALSE (cursize < relative_offset))
return -2; /* nothing in the fifo */
- to_copy = len = clib_min (cursize - relative_offset, len);
+ len = clib_min (cursize - relative_offset, len);
- c = f->head_chunk;
- head_idx = (head + relative_offset) % f->size;
- head_idx -= c->start_byte;
- n_chunk = c->length - head_idx;
-
- if (n_chunk < to_copy)
- {
- clib_memcpy_fast (dst, &c->data[head_idx], n_chunk);
- while ((to_copy -= n_chunk))
- {
- c = c->next;
- n_chunk = clib_min (c->length, to_copy);
- clib_memcpy_fast (dst + (len - to_copy), &c->data[0], n_chunk);
- }
- f->head_chunk = c;
- }
- else
- {
- clib_memcpy_fast (dst, &c->data[head_idx], to_copy);
- }
+ svm_fifo_copy_from_chunk (f, f->head_chunk,
+ (head + relative_offset) % f->size, dst, len,
+ 0 /* update head */ );
return len;
}
-#ifndef CLIB_MARCH_VARIANT
-
-int
-svm_fifo_peek (svm_fifo_t * f, u32 relative_offset, u32 max_bytes,
- u8 * copy_here)
-{
- return CLIB_MARCH_FN_SELECT (svm_fifo_peek) (f, relative_offset, max_bytes,
- copy_here);
-}
-
int
svm_fifo_dequeue_drop (svm_fifo_t * f, u32 max_bytes)
{