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svm: Add support for thresh dequeue notification

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Add the ability to set a threshold on the fifo that will
be used to notify caller when de-queue from the fifo reached
a value that is less than or equal to the threshold.

Type: feature

Change-Id: I70ba1a05f783ce5247409e9beebe4e336b7c1eb5
Signed-off-by: Michal Kalderon <mkalderon@marvell.com>
Signed-off-by: Yuval Caduri <cyuval@marvell.com>
This commit is contained in:
Michal Kalderon
2021-12-21 04:41:53 -08:00
committed by Florin Coras
parent 89618da2f7
commit fb079585cf
2 changed files with 24 additions and 2 deletions
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1
src/svm/fifo_types.h
View File

@ -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 */

25
src/svm/svm_fifo.h
View File

@ -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__ */
/*