Adds the ability to find the remaining space in the IOAT ring.
Signed-off-by: Conor Walsh <conor.wa...@intel.com>
Signed-off-by: Kevin Laatz <kevin.la...@intel.com>
---
drivers/dma/ioat/ioat_dmadev.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/drivers/dma/ioat/ioat_dmadev.c b/drivers/dma/ioat/ioat_dmadev.c
index b93289516e..e82a7424e5 100644
--- a/drivers/dma/ioat/ioat_dmadev.c
+++ b/drivers/dma/ioat/ioat_dmadev.c
@@ -493,6 +493,19 @@ ioat_completed_status(struct rte_dma_dev *dev, uint16_t
qid __rte_unused,
return count;
}
+/* Get the remaining capacity of the ring. */
+static uint16_t
+ioat_burst_capacity(const struct rte_dma_dev *dev, uint16_t vchan __rte_unused)
+{
+ struct ioat_dmadev *ioat = dev->data->dev_private;
+ unsigned short size = ioat->qcfg.nb_desc - 1;
+ unsigned short read = ioat->next_read;
+ unsigned short write = ioat->next_write;
+ unsigned short space = size - (write - read);
+
+ return space;
+}
+
/* Retrieve the generic stats of a DMA device. */
static int
ioat_stats_get(const struct rte_dma_dev *dev, uint16_t vchan __rte_unused,
@@ -544,6 +557,7 @@ static int
ioat_dmadev_create(const char *name, struct rte_pci_device *dev)
{
static const struct rte_dma_dev_ops ioat_dmadev_ops = {
+ .burst_capacity = ioat_burst_capacity,
.dev_close = ioat_dev_close,
.dev_configure = ioat_dev_configure,
.dev_dump = ioat_dev_dump,
--
2.25.1
