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-rw-r--r--src/svm/svm_fifo.h53
1 files changed, 42 insertions, 11 deletions
diff --git a/src/svm/svm_fifo.h b/src/svm/svm_fifo.h
index c4cc0382ab7..7ea114f8702 100644
--- a/src/svm/svm_fifo.h
+++ b/src/svm/svm_fifo.h
@@ -759,7 +759,7 @@ svm_fifo_unset_event (svm_fifo_t * f)
static inline void
svm_fifo_add_want_deq_ntf (svm_fifo_t * f, u8 ntf_type)
{
- f->shr->want_deq_ntf |= ntf_type;
+ __atomic_or_fetch (&f->shr->want_deq_ntf, ntf_type, __ATOMIC_RELEASE);
}
/**
@@ -773,7 +773,21 @@ svm_fifo_add_want_deq_ntf (svm_fifo_t * f, u8 ntf_type)
static inline void
svm_fifo_del_want_deq_ntf (svm_fifo_t * f, u8 ntf_type)
{
- f->shr->want_deq_ntf &= ~ntf_type;
+ __atomic_and_fetch (&f->shr->want_deq_ntf, ~ntf_type, __ATOMIC_RELEASE);
+}
+
+/**
+ * Get want notification flag
+ *
+ * Done atomically with acquire memory ordering
+ *
+ * @param f fifo
+ * @return value of want_deq_ntf flag
+ */
+static inline u32
+svm_fifo_get_want_deq_ntf (svm_fifo_t *f)
+{
+ return clib_atomic_load_acq_n (&f->shr->want_deq_ntf);
}
/**
@@ -790,10 +804,27 @@ svm_fifo_del_want_deq_ntf (svm_fifo_t * f, u8 ntf_type)
static inline void
svm_fifo_clear_deq_ntf (svm_fifo_t * f)
{
- /* Set the flag if want_notif_if_full was the only ntf requested */
- f->shr->has_deq_ntf =
- f->shr->want_deq_ntf == SVM_FIFO_WANT_DEQ_NOTIF_IF_FULL;
- svm_fifo_del_want_deq_ntf (f, SVM_FIFO_WANT_DEQ_NOTIF);
+ u32 want_deq_ntf = svm_fifo_get_want_deq_ntf (f);
+ /* Set the flag if want ntf if full or empty was requested */
+ if (want_deq_ntf &
+ (SVM_FIFO_WANT_DEQ_NOTIF_IF_FULL | SVM_FIFO_WANT_DEQ_NOTIF_IF_EMPTY))
+ clib_atomic_store_rel_n (&f->shr->has_deq_ntf, 1);
+ if (want_deq_ntf & SVM_FIFO_WANT_DEQ_NOTIF)
+ svm_fifo_del_want_deq_ntf (f, SVM_FIFO_WANT_DEQ_NOTIF);
+}
+
+/**
+ * Get has dequeue notification flag
+ *
+ * Done atomically with acquire memory ordering
+ *
+ * @param f fifo
+ * @return has_deq_ntf flag
+ */
+static inline u32
+svm_fifo_has_deq_ntf (svm_fifo_t *f)
+{
+ return clib_atomic_load_acq_n (&f->shr->has_deq_ntf);
}
/**
@@ -824,9 +855,9 @@ svm_fifo_reset_has_deq_ntf (svm_fifo_t * f)
static inline u8
svm_fifo_needs_deq_ntf (svm_fifo_t * f, u32 n_last_deq)
{
- u8 want_ntf = f->shr->want_deq_ntf;
+ u32 want_ntf = svm_fifo_get_want_deq_ntf (f);
- if (PREDICT_TRUE (want_ntf == SVM_FIFO_NO_DEQ_NOTIF))
+ if (want_ntf == SVM_FIFO_NO_DEQ_NOTIF)
return 0;
else if (want_ntf & SVM_FIFO_WANT_DEQ_NOTIF)
return (svm_fifo_max_enqueue (f) >= f->shr->deq_thresh);
@@ -834,13 +865,13 @@ svm_fifo_needs_deq_ntf (svm_fifo_t * f, u32 n_last_deq)
{
u32 max_deq = svm_fifo_max_dequeue_cons (f);
u32 size = f->shr->size;
- if (!f->shr->has_deq_ntf && max_deq < size &&
- max_deq + n_last_deq >= size)
+ if (max_deq < size && max_deq + n_last_deq >= size &&
+ !svm_fifo_has_deq_ntf (f))
return 1;
}
if (want_ntf & SVM_FIFO_WANT_DEQ_NOTIF_IF_EMPTY)
{
- if (!f->shr->has_deq_ntf && svm_fifo_is_empty (f))
+ if (!svm_fifo_has_deq_ntf (f) && svm_fifo_is_empty (f))
return 1;
}
return 0;