doc: vhost multi-queue reconnection known issue
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Commit Message
This patch added known issue for vhost multi-queue reconnection
with virtio-net/virtio-pmd.
Signed-off-by: Xuan Ding <xuan.ding@intel.com>
---
doc/guides/rel_notes/known_issues.rst | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
Comments
On 7/28/20 3:33 AM, Xuan Ding wrote:
> This patch added known issue for vhost multi-queue reconnection
> with virtio-net/virtio-pmd.
>
> Signed-off-by: Xuan Ding <xuan.ding@intel.com>
> ---
> doc/guides/rel_notes/known_issues.rst | 21 +++++++++++++++++++++
> 1 file changed, 21 insertions(+)
>
> diff --git a/doc/guides/rel_notes/known_issues.rst b/doc/guides/rel_notes/known_issues.rst
> index de0782136..3359cf063 100644
> --- a/doc/guides/rel_notes/known_issues.rst
> +++ b/doc/guides/rel_notes/known_issues.rst
> @@ -888,3 +888,24 @@ Unsuitable IOVA mode may be picked as the default
>
> **Driver/Module**:
> ALL.
> +
> +Vhost multi-queue reconnection failed with QEMU version >= 4.2.0
> +-------------------------------------------------
> +
> +**Description**
> + It's a QEMU regression bug (bad commit: c6beefd674ff). QEMU only saves
> + acked features for one vhost-net when vhost quits. When vhost reconnects
> + to virtio-net/virtio-pmd in multi-queue situations, the features been
> + set multiple times are not consistent.
> +
> +**Implication**
> + Vhost cannot reconnect back to virtio-net/virtio-pmd normally.
> +
> +**Resolution/Workaround**:
> + It is possible to filter the incorrect acked features at vhost-user side.
> +
> +**Affected Environment/Platform**:
> + ALL.
> +
> +**Driver/Module**:
> + Virtual Device Poll Mode Driver (PMD).
>
Thanks for documenting this Qemu issue.
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Maxime
On 7/28/20 3:33 AM, Xuan Ding wrote:
> This patch added known issue for vhost multi-queue reconnection
> with virtio-net/virtio-pmd.
>
> Signed-off-by: Xuan Ding <xuan.ding@intel.com>
> ---
> doc/guides/rel_notes/known_issues.rst | 21 +++++++++++++++++++++
> 1 file changed, 21 insertions(+)
Applied to dpdk-next-virtio/master
Thanks,
Maxime
On 7/28/2020 2:33 AM, Xuan Ding wrote:
> This patch added known issue for vhost multi-queue reconnection
> with virtio-net/virtio-pmd.
>
> Signed-off-by: Xuan Ding <xuan.ding@intel.com>
> ---
> doc/guides/rel_notes/known_issues.rst | 21 +++++++++++++++++++++
> 1 file changed, 21 insertions(+)
>
> diff --git a/doc/guides/rel_notes/known_issues.rst b/doc/guides/rel_notes/known_issues.rst
> index de0782136..3359cf063 100644
> --- a/doc/guides/rel_notes/known_issues.rst
> +++ b/doc/guides/rel_notes/known_issues.rst
> @@ -888,3 +888,24 @@ Unsuitable IOVA mode may be picked as the default
>
> **Driver/Module**:
> ALL.
> +
> +Vhost multi-queue reconnection failed with QEMU version >= 4.2.0
> +-------------------------------------------------
Getting a format warning [1], will fix while merging.
[1]: known_issues.rst:893: WARNING: Title underline too short.
Hi Ferruh,
Thank you for your comments and fix.
Regards,
Xuan
-----Original Message-----
From: Ferruh Yigit <ferruh.yigit@intel.com>
Sent: Wednesday, July 29, 2020 1:40 AM
To: Ding, Xuan <xuan.ding@intel.com>; maxime.coquelin@redhat.com; Wang, Zhihong <zhihong.wang@intel.com>; Xia, Chenbo <chenbo.xia@intel.com>
Cc: dev@dpdk.org
Subject: Re: [dpdk-dev] [PATCH] doc: vhost multi-queue reconnection known issue
On 7/28/2020 2:33 AM, Xuan Ding wrote:
> This patch added known issue for vhost multi-queue reconnection
> with virtio-net/virtio-pmd.
>
> Signed-off-by: Xuan Ding <xuan.ding@intel.com>
> ---
> doc/guides/rel_notes/known_issues.rst | 21 +++++++++++++++++++++
> 1 file changed, 21 insertions(+)
>
> diff --git a/doc/guides/rel_notes/known_issues.rst b/doc/guides/rel_notes/known_issues.rst
> index de0782136..3359cf063 100644
> --- a/doc/guides/rel_notes/known_issues.rst
> +++ b/doc/guides/rel_notes/known_issues.rst
> @@ -888,3 +888,24 @@ Unsuitable IOVA mode may be picked as the default
>
> **Driver/Module**:
> ALL.
> +
> +Vhost multi-queue reconnection failed with QEMU version >= 4.2.0
> +-------------------------------------------------
Getting a format warning [1], will fix while merging.
[1]: known_issues.rst:893: WARNING: Title underline too short.
@@ -888,3 +888,24 @@ Unsuitable IOVA mode may be picked as the default
**Driver/Module**:
ALL.
+
+Vhost multi-queue reconnection failed with QEMU version >= 4.2.0
+-------------------------------------------------
+
+**Description**
+ It's a QEMU regression bug (bad commit: c6beefd674ff). QEMU only saves
+ acked features for one vhost-net when vhost quits. When vhost reconnects
+ to virtio-net/virtio-pmd in multi-queue situations, the features been
+ set multiple times are not consistent.
+
+**Implication**
+ Vhost cannot reconnect back to virtio-net/virtio-pmd normally.
+
+**Resolution/Workaround**:
+ It is possible to filter the incorrect acked features at vhost-user side.
+
+**Affected Environment/Platform**:
+ ALL.
+
+**Driver/Module**:
+ Virtual Device Poll Mode Driver (PMD).