[dpdk-dev] [PATCH] virtio: fix used ring address calculation

Huawei Xie huawei.xie at intel.com
Mon Sep 21 05:39:02 CEST 2015


used event idx is put at the end of available ring. It isn't taken into account
when we calculate the address of used ring. Fortunately, it doesn't introduce
the bug with fixed queue number 256 and 4KB alignment.

Signed-off-by: hxie5 <huawei.xie at intel.com>
---
 drivers/net/virtio/virtio_ring.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/virtio/virtio_ring.h b/drivers/net/virtio/virtio_ring.h
index a16c499..92e430d 100644
--- a/drivers/net/virtio/virtio_ring.h
+++ b/drivers/net/virtio/virtio_ring.h
@@ -145,7 +145,7 @@ vring_init(struct vring *vr, unsigned int num, uint8_t *p,
 	vr->avail = (struct vring_avail *) (p +
 		num * sizeof(struct vring_desc));
 	vr->used = (void *)
-		RTE_ALIGN_CEIL((uintptr_t)(&vr->avail->ring[num]), align);
+		RTE_ALIGN_CEIL((uintptr_t)(&vr->avail->ring[num + 1]), align);
 }
 
 /*
-- 
1.9.3



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