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-rw-r--r--src/svm/svm_fifo.c10
-rw-r--r--src/svm/svm_fifo.h83
-rw-r--r--src/svm/svm_fifo_segment.c5
3 files changed, 86 insertions, 12 deletions
diff --git a/src/svm/svm_fifo.c b/src/svm/svm_fifo.c
index de1997452d5..41cd752914a 100644
--- a/src/svm/svm_fifo.c
+++ b/src/svm/svm_fifo.c
@@ -216,11 +216,10 @@ svm_fifo_init (svm_fifo_t * f, u32 size)
f->ct_session_index = SVM_FIFO_INVALID_SESSION_INDEX;
f->segment_index = SVM_FIFO_INVALID_INDEX;
f->refcnt = 1;
- f->head_chunk = &f->default_chunk;
- f->tail_chunk = &f->default_chunk;
- f->default_chunk.next = &f->default_chunk;
f->default_chunk.start_byte = 0;
f->default_chunk.length = f->size;
+ f->default_chunk.next = f->start_chunk = &f->default_chunk;
+ f->end_chunk = f->head_chunk = f->tail_chunk = f->start_chunk;
}
/** create an svm fifo, in the current heap. Fails vs blow up the process */
@@ -650,6 +649,7 @@ CLIB_MARCH_FN (svm_fifo_dequeue_nowait, int, svm_fifo_t * f, u32 len,
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;
@@ -673,7 +673,9 @@ CLIB_MARCH_FN (svm_fifo_dequeue_nowait, int, svm_fifo_t * f, u32 len,
}
head += len;
- ASSERT (cursize >= to_copy);
+ if (PREDICT_FALSE (f->flags & SVM_FIFO_F_SIZE_UPDATE))
+ svm_fifo_try_size_update (f, head);
+
/* store-rel: consumer owned index (paired with load-acq in producer) */
clib_atomic_store_rel_n (&f->head, head);
diff --git a/src/svm/svm_fifo.h b/src/svm/svm_fifo.h
index f311576f5af..39f052fb9fd 100644
--- a/src/svm/svm_fifo.h
+++ b/src/svm/svm_fifo.h
@@ -46,7 +46,7 @@ format_function_t format_ooo_list;
#define SVM_FIFO_INVALID_INDEX ((u32)~0)
#define SVM_FIFO_MAX_EVT_SUBSCRIBERS 8
-enum
+enum svm_fifo_tx_ntf_
{
SVM_FIFO_NO_TX_NOTIF = 0,
SVM_FIFO_WANT_TX_NOTIF = 1,
@@ -68,13 +68,20 @@ typedef struct svm_fifo_chunk_
u8 data[0];
} svm_fifo_chunk_t;
+typedef enum svm_fifo_flag_
+{
+ SVM_FIFO_F_SIZE_UPDATE = 1 << 0,
+} svm_fifo_flag_t;
+
typedef struct _svm_fifo
{
CLIB_CACHE_LINE_ALIGN_MARK (shared_first);
u32 size; /**< size of the fifo */
u32 nitems; /**< usable size(size-1) */
- struct _svm_fifo *next; /**< next in freelist/active chain */
- struct _svm_fifo *prev; /**< prev in active chain */
+ u8 flags; /**< fifo flags */
+ svm_fifo_chunk_t *start_chunk;/**< first chunk in fifo chunk list */
+ svm_fifo_chunk_t *end_chunk; /**< end chunk in fifo chunk list */
+ svm_fifo_chunk_t *new_chunks; /**< chunks yet to be added to list */
CLIB_CACHE_LINE_ALIGN_MARK (shared_second);
volatile u32 has_event; /**< non-zero if deq event exists */
@@ -88,16 +95,18 @@ typedef struct _svm_fifo
u32 ct_session_index; /**< Local session index for vpp */
u32 freelist_index; /**< aka log2(allocated_size) - const. */
i8 refcnt; /**< reference count */
+ struct _svm_fifo *next; /**< next in freelist/active chain */
+ struct _svm_fifo *prev; /**< prev in active chain */
CLIB_CACHE_LINE_ALIGN_MARK (consumer);
u32 head;
- svm_fifo_chunk_t *head_chunk;
+ svm_fifo_chunk_t *head_chunk; /**< tracks chunk where head lands */
volatile u32 want_tx_ntf; /**< producer wants nudge */
volatile u32 has_tx_ntf;
CLIB_CACHE_LINE_ALIGN_MARK (producer);
u32 tail;
- svm_fifo_chunk_t *tail_chunk;
+ svm_fifo_chunk_t *tail_chunk; /**< tracks chunk where tail lands */
ooo_segment_t *ooo_segments; /**< Pool of ooo segments */
u32 ooos_list_head; /**< Head of out-of-order linked-list */
@@ -511,6 +520,70 @@ ooo_segment_next (svm_fifo_t * f, ooo_segment_t * s)
return pool_elt_at_index (f->ooo_segments, s->next);
}
+static inline u8
+svm_fifo_is_wrapped (svm_fifo_t * f)
+{
+ u32 head, tail;
+ f_load_head_tail_all_acq (f, &head, &tail);
+ return head % f->size > tail % f->size;
+}
+
+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 inline 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);
+}
+
+static inline 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;
+}
#endif /* __included_ssvm_fifo_h__ */
/*
diff --git a/src/svm/svm_fifo_segment.c b/src/svm/svm_fifo_segment.c
index 90bf593f74c..f5fe60a280d 100644
--- a/src/svm/svm_fifo_segment.c
+++ b/src/svm/svm_fifo_segment.c
@@ -23,11 +23,10 @@ fifo_init_for_segment (svm_fifo_segment_header_t * fsh, u8 * fifo_space,
f = (svm_fifo_t *) fifo_space;
f->freelist_index = freelist_index;
- f->default_chunk.next = &f->default_chunk;
f->default_chunk.start_byte = 0;
f->default_chunk.length = size;
- f->head_chunk = &f->default_chunk;
- f->tail_chunk = &f->default_chunk;
+ f->default_chunk.next = f->start_chunk = &f->default_chunk;
+ f->end_chunk = f->head_chunk = f->tail_chunk = f->start_chunk;
f->next = fsh->free_fifos[freelist_index];
fsh->free_fifos[freelist_index] = f;
}