[dpdk-dev] [PATCH v2 09/10] dma/ioat: add support for vchan idle function

[Conor Walsh]

Add support for the rte_dmadev_vchan_idle API call.

Signed-off-by: Conor Walsh <conor.wa...@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 743fb2f558..a09e60b27e 100644
--- a/drivers/dma/ioat/ioat_dmadev.c
+++ b/drivers/dma/ioat/ioat_dmadev.c
@@ -506,6 +506,19 @@ ioat_stats_reset(struct rte_dmadev *dev, uint16_t vchan 
__rte_unused)
        return 0;
 }
 
+/* Check if the IOAT device is idle. */
+static int
+ioat_vchan_idle(const struct rte_dmadev *dev, uint16_t vchan __rte_unused)
+{
+       int state = 0;
+       const struct ioat_dmadev *ioat = dev->dev_private;
+       const uint16_t mask = ioat->qcfg.nb_desc - 1;
+       const uint16_t last = __get_last_completed(ioat, &state);
+
+       return (last == ((ioat->next_write - 1) & mask) || state == 
IOAT_CHANSTS_HALTED
+                       || state == IOAT_CHANSTS_SUSPENDED);
+}
+
 /* Create a DMA device. */
 static int
 ioat_dmadev_create(const char *name, struct rte_pci_device *dev)
@@ -519,6 +532,7 @@ ioat_dmadev_create(const char *name, struct rte_pci_device 
*dev)
                .dev_stop = ioat_dev_stop,
                .stats_get = ioat_stats_get,
                .stats_reset = ioat_stats_reset,
+               .vchan_idle = ioat_vchan_idle,
                .vchan_setup = ioat_vchan_setup,
        };
 
-- 
2.25.1