From: Yuanhan Liu <yuanhan.liu@linux.intel.com>
To: Zhihong Wang <zhihong.wang@intel.com>
Cc: dev@dpdk.org, maxime.coquelin@redhat.com,
thomas.monjalon@6wind.com, stable@dpdk.org
Subject: Re: [dpdk-stable] [PATCH v6 1/6] vhost: fix windows vm hang
Date: Thu, 13 Oct 2016 14:18:51 +0800 [thread overview]
Message-ID: <20161013061851.GZ10323@yliu-dev.sh.intel.com> (raw)
In-Reply-To: <1474336817-22683-2-git-send-email-zhihong.wang@intel.com>
On Mon, Sep 19, 2016 at 10:00:12PM -0400, Zhihong Wang wrote:
> This patch fixes a Windows VM compatibility issue in DPDK 16.07 vhost code
> which causes the guest to hang once any packets are enqueued when mrg_rxbuf
> is turned on by setting the right id and len in the used ring.
>
> As defined in virtio spec 0.95 and 1.0, in each used ring element, id means
> index of start of used descriptor chain, and len means total length of the
> descriptor chain which was written to. While in 16.07 code, index of the
> last descriptor is assigned to id, and the length of the last descriptor is
> assigned to len.
>
> How to test?
>
> 1. Start testpmd in the host with a vhost port.
>
> 2. Start a Windows VM image with qemu and connect to the vhost port.
>
> 3. Start io forwarding with tx_first in host testpmd.
>
> For 16.07 code, the Windows VM will hang once any packets are enqueued.
>
> Cc: <stable@dpdk.org>
> Signed-off-by: Zhihong Wang <zhihong.wang@intel.com>
Applied to dpdk-next-virtio (this patch only).
Thanks.
--yliu
next prev parent reply other threads:[~2016-10-13 6:18 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1471319402-112998-1-git-send-email-zhihong.wang@intel.com>
[not found] ` <1472528164-54296-1-git-send-email-zhihong.wang@intel.com>
2016-08-30 3:35 ` [dpdk-stable] [PATCH v4 " Zhihong Wang
2016-09-05 5:24 ` Yuanhan Liu
2016-09-05 5:25 ` Wang, Zhihong
2016-09-05 5:40 ` Yuanhan Liu
[not found] ` <1473392368-84903-1-git-send-email-zhihong.wang@intel.com>
2016-09-09 3:39 ` [dpdk-stable] [PATCH v5 " Zhihong Wang
[not found] ` <1474336817-22683-1-git-send-email-zhihong.wang@intel.com>
2016-09-20 2:00 ` [dpdk-stable] [PATCH v6 " Zhihong Wang
2016-10-13 6:18 ` Yuanhan Liu [this message]
[not found] <1474255184-139302-1-git-send-email-zhihong.wang@intel.com>
2016-09-19 3:19 ` Zhihong Wang
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