[dpdk-dev] [PATCH v7 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.wa...@intel.com>
Signed-off-by: Kevin Laatz <kevin.la...@intel.com>
Acked-by: Bruce Richardson <bruce.richard...@intel.com>
---
 drivers/dma/ioat/ioat_dmadev.c | 20 +++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

diff --git a/drivers/dma/ioat/ioat_dmadev.c b/drivers/dma/ioat/ioat_dmadev.c
index 17ac3217c7..a230496b11 100644
--- a/drivers/dma/ioat/ioat_dmadev.c
+++ b/drivers/dma/ioat/ioat_dmadev.c
@@ -516,12 +516,25 @@ ioat_completed_status(void *dev_private, uint16_t qid 
__rte_unused,
        return count;
 }
 
+/* Get the remaining capacity of the ring. */
+static uint16_t
+ioat_burst_capacity(const void *dev_private, uint16_t vchan __rte_unused)
+{
+       const struct ioat_dmadev *ioat = 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,
                struct rte_dma_stats *rte_stats, uint32_t size)
 {
-       struct rte_dma_stats *stats = (&((struct ioat_dmadev 
*)dev->dev_private)->stats);
+       struct rte_dma_stats *stats = (&((struct ioat_dmadev 
*)dev->fp_obj->dev_private)->stats);
 
        if (size < sizeof(rte_stats))
                return -EINVAL;
@@ -536,7 +549,7 @@ ioat_stats_get(const struct rte_dma_dev *dev, uint16_t 
vchan __rte_unused,
 static int
 ioat_stats_reset(struct rte_dma_dev *dev, uint16_t vchan __rte_unused)
 {
-       struct ioat_dmadev *ioat = dev->dev_private;
+       struct ioat_dmadev *ioat = dev->fp_obj->dev_private;
 
        ioat->stats = (struct rte_dma_stats){0};
        return 0;
@@ -548,7 +561,7 @@ ioat_vchan_status(const struct rte_dma_dev *dev, uint16_t 
vchan __rte_unused,
                enum rte_dma_vchan_status *status)
 {
        int state = 0;
-       const struct ioat_dmadev *ioat = dev->dev_private;
+       const struct ioat_dmadev *ioat = dev->fp_obj->dev_private;
        const uint16_t mask = ioat->qcfg.nb_desc - 1;
        const uint16_t last = __get_last_completed(ioat, &state);
 
@@ -601,6 +614,7 @@ ioat_dmadev_create(const char *name, struct rte_pci_device 
*dev)
 
        dmadev->dev_ops = &ioat_dmadev_ops;
 
+       dmadev->fp_obj->burst_capacity = ioat_burst_capacity;
        dmadev->fp_obj->completed = ioat_completed;
        dmadev->fp_obj->completed_status = ioat_completed_status;
        dmadev->fp_obj->copy = ioat_enqueue_copy;
-- 
2.25.1