examples/vhost: fix ioat ring space in callbacks

We use ioat ring space for determining if ioat callbacks can enqueue a
packet to ioat device. But there is one slot can't be used in ioat
ring due to the ioat driver design, so we need to reduce one slot in
ioat ring to prevent ring size mismatch in ioat callbacks.

Fixes: 2aa47e94bfb2 ("examples/vhost: add ioat ring space count and check")
Cc: stable@dpdk.org
Signed-off-by: Cheng Jiang <cheng1.jiang@intel.com>
Reviewed-by: Jiayu Hu <jiayu.hu@intel.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>

diff --git a/examples/vhost/ioat.c b/examples/vhost/ioat.c
index efdd3f6f7681124d0d6c162e89adc68c48203340..2a2c2d72026eabfab5b2aa8d1c42ba004c4e8e6e 100644 (file)
--- a/examples/vhost/ioat.c
+++ b/examples/vhost/ioat.c
@@ -113,7 +113,7 @@ open_ioat(const char *value)
                        goto out;
                }
                rte_rawdev_start(dev_id);
-               cb_tracker[dev_id].ioat_space = IOAT_RING_SIZE;
+               cb_tracker[dev_id].ioat_space = IOAT_RING_SIZE - 1;
                dma_info->nr++;
                i++;
        }