[dpdk-dev] [PATCH v6 10/12] dma/ioat: add burst capacity function

[Conor Walsh]

Adds the ability to find the remaining space in the IOAT ring.

Signed-off-by: Conor Walsh <conor.walsh at intel.com>
Signed-off-by: Kevin Laatz <kevin.laatz at intel.com>
Acked-by: Bruce Richardson <bruce.richardson at 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 fe01a3b1db..6c783ec94f 100644
--- a/drivers/dma/ioat/ioat_dmadev.c
+++ b/drivers/dma/ioat/ioat_dmadev.c
@@ -509,6 +509,19 @@ 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,
@@ -594,6 +607,7 @@ ioat_dmadev_create(const char *name, struct rte_pci_device *dev)
 
 	dmadev->dev_ops = &ioat_dmadev_ops;
 
+	dmadev->burst_capacity = ioat_burst_capacity;
 	dmadev->completed = ioat_completed;
 	dmadev->completed_status = ioat_completed_status;
 	dmadev->copy = ioat_enqueue_copy;
-- 
2.25.1