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