From: "Xie, Huawei" <huawei.xie@intel.com>
To: "dev@dpdk.org" <dev@dpdk.org>, "Tan, Jianfeng" <jianfeng.tan@intel.com>
Subject: Re: [dpdk-dev] [PATCH] virtio: fix used ring address calculation
Date: Thu, 24 Sep 2015 07:30:41 +0000 [thread overview]
Message-ID: <C37D651A908B024F974696C65296B57B40F2CA05@SHSMSX101.ccr.corp.intel.com> (raw)
In-Reply-To: <1442806742-32547-1-git-send-email-huawei.xie@intel.com>
On 9/21/2015 11:39 AM, Xie, Huawei wrote:
vring_size calculation should consider both used_event_idx at the tail
of avail ring and avail_event_idx at the tail of used ring.
Will merge those two fixes and send a new patch.
> 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@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);
> }
>
> /*
next prev parent reply other threads:[~2015-09-24 7:30 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-21 3:39 Huawei Xie
2015-09-21 9:19 ` Tan, Jianfeng
2015-09-24 7:30 ` Xie, Huawei [this message]
2015-09-24 16:36 ` Stephen Hemminger
2015-09-24 18:35 ` Xie, Huawei
2015-09-24 21:01 ` Stephen Hemminger
2015-09-25 15:46 ` Xie, Huawei
2015-09-25 17:48 ` Stephen Hemminger
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