diff options
| -rw-r--r-- | src/svm/fifo_types.h | 1 | ||||
| -rw-r--r-- | src/svm/svm_fifo.h | 25 |
2 files changed, 24 insertions, 2 deletions
diff --git a/src/svm/fifo_types.h b/src/svm/fifo_types.h index 3787e5d5831..742351b1764 100644 --- a/src/svm/fifo_types.h +++ b/src/svm/fifo_types.h @@ -78,6 +78,7 @@ typedef struct svm_fifo_shr_ u32 head; /**< fifo head position/byte */ volatile u32 want_deq_ntf; /**< producer wants nudge */ volatile u32 has_deq_ntf; + u32 deq_thresh; /**< fifo threshold used for notifications */ CLIB_CACHE_LINE_ALIGN_MARK (producer); u32 tail; /**< fifo tail position/byte */ diff --git a/src/svm/svm_fifo.h b/src/svm/svm_fifo.h index aed8770b458..42efb5af6b3 100644 --- a/src/svm/svm_fifo.h +++ b/src/svm/svm_fifo.h @@ -34,7 +34,9 @@ typedef enum svm_fifo_deq_ntf_ SVM_FIFO_NO_DEQ_NOTIF = 0, /**< No notification requested */ SVM_FIFO_WANT_DEQ_NOTIF = 1, /**< Notify on dequeue */ SVM_FIFO_WANT_DEQ_NOTIF_IF_FULL = 2, /**< Notify on transition from full */ - SVM_FIFO_WANT_DEQ_NOTIF_IF_EMPTY = 4, /**< Notify on transition to empty */ + SVM_FIFO_WANT_DEQ_NOTIF_IF_EMPTY = 4, /**< Notify on transition to empty */ + SVM_FIFO_WANT_DEQ_NOTIF_IF_LEQ_THRESH = 5, /**< Notify on transition to less + than or equal threshold */ } svm_fifo_deq_ntf_t; typedef enum svm_fifo_flag_ @@ -793,7 +795,8 @@ 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); + svm_fifo_del_want_deq_ntf (f, SVM_FIFO_WANT_DEQ_NOTIF | + SVM_FIFO_WANT_DEQ_NOTIF_IF_LEQ_THRESH); } /** @@ -843,9 +846,27 @@ svm_fifo_needs_deq_ntf (svm_fifo_t * f, u32 n_last_deq) if (!f->shr->has_deq_ntf && svm_fifo_is_empty (f)) return 1; } + if (want_ntf & SVM_FIFO_WANT_DEQ_NOTIF_IF_LEQ_THRESH) + { + if (!f->shr->has_deq_ntf && + (svm_fifo_max_dequeue (f) <= f->shr->deq_thresh)) + return 1; + } return 0; } +/** + * Set the fifo dequeue threshold which will be used for notifications. + * + * Note: If not set, by default threshold is zero, equivalent to + * empty. + */ +static inline void +svm_fifo_set_deq_thresh (svm_fifo_t *f, u32 thresh) +{ + f->shr->deq_thresh = thresh; +} + #endif /* __included_ssvm_fifo_h__ */ /* |