[PATCH v2 2/6] dma/ioat: fix incorrectly set indexes after restart

[Bruce Richardson]

As part of the process of restarting a dma instance, the IOAT driver
will reset the HW addresses and state values. The read and write
indexes for SW use need to be similarly reset to keep HW and SW in
sync.

Fixes: 583f046dd404 ("dma/ioat: add start and stop")
Cc: conor.walsh at intel.com
Cc: stable at dpdk.org

Signed-off-by: Bruce Richardson <bruce.richardson at intel.com>
---
 drivers/dma/ioat/ioat_dmadev.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/dma/ioat/ioat_dmadev.c b/drivers/dma/ioat/ioat_dmadev.c
index aff7bbbfde..072eb17cd9 100644
--- a/drivers/dma/ioat/ioat_dmadev.c
+++ b/drivers/dma/ioat/ioat_dmadev.c
@@ -146,6 +146,13 @@ ioat_dev_start(struct rte_dma_dev *dev)
 	/* Prime the status register to be set to the last element. */
 	ioat->status = ioat->ring_addr + ((ioat->qcfg.nb_desc - 1) * DESC_SZ);
 
+	/* reset all counters */
+	ioat->next_read = 0;
+	ioat->next_write = 0;
+	ioat->last_write = 0;
+	ioat->offset = 0;
+	ioat->failure = 0;
+
 	printf("IOAT.status: %s [0x%"PRIx64"]\n",
 			chansts_readable[ioat->status & IOAT_CHANSTS_STATUS],
 			ioat->status);
-- 
2.37.2