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From: "Xia, Chenbo" <chenbo.xia@intel.com>
To: "Ding, Xuan" <xuan.ding@intel.com>,
	"maxime.coquelin@redhat.com" <maxime.coquelin@redhat.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>, "Hu, Jiayu" <jiayu.hu@intel.com>,
	"stable@dpdk.org" <stable@dpdk.org>
Subject: RE: [PATCH v3] doc: fix vhost multi-queue reconnection
Date: Fri, 6 May 2022 08:40:55 +0000	[thread overview]
Message-ID: <SN6PR11MB3504FA8C563C3E892573387B9CC59@SN6PR11MB3504.namprd11.prod.outlook.com> (raw)
In-Reply-To: <20220415020801.37612-1-xuan.ding@intel.com>

> -----Original Message-----
> From: Ding, Xuan <xuan.ding@intel.com>
> Sent: Friday, April 15, 2022 10:08 AM
> To: maxime.coquelin@redhat.com; Xia, Chenbo <chenbo.xia@intel.com>
> Cc: dev@dpdk.org; Hu, Jiayu <jiayu.hu@intel.com>; Ding, Xuan
> <xuan.ding@intel.com>; stable@dpdk.org
> Subject: [PATCH v3] doc: fix vhost multi-queue reconnection
> 
> From: Xuan Ding <xuan.ding@intel.com>
> 
> Since QEMU 5.2.0 fixes the vhost split ring multi-queue reconnection
> issue in commit f66337bdbfda ("vhost-user: save features of multiqueues
> if chardev is closed"), this patch updates known issue to indicate
> the range of affeacted QEMU versions.
> 
> Fixes: b37e95507e1b ("doc: add vhost multi-queue reconnection issue")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Xuan Ding <xuan.ding@intel.com>
> ---
> v3:
> * Updated affected QEMU versions.
> 
> v2:
> * Add fixes in commit title and log.
> ---
>  doc/guides/rel_notes/known_issues.rst | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/doc/guides/rel_notes/known_issues.rst
> b/doc/guides/rel_notes/known_issues.rst
> index 187d9c942e..bd89d58d24 100644
> --- a/doc/guides/rel_notes/known_issues.rst
> +++ b/doc/guides/rel_notes/known_issues.rst
> @@ -885,14 +885,15 @@ Unsuitable IOVA mode may be picked as the default
>  **Driver/Module**:
>     ALL.
> 
> -Vhost multi-queue reconnection failed with QEMU version >= 4.2.0
> -----------------------------------------------------------------
> +Vhost multi-queue reconnection failed with QEMU version 4.2.0 to 5.1.0-
> rc3

So 5.1.0 fixes the problem or not? As 5.1.0 is later than 5.1.0-rc3 but you said
from 5.2.0 it's fixed. And I think we should just mention formal release, not any
rc, qemu users should not use any rc for formal usage.

Thanks,
Chenbo

> +-------------------------------------------------------------------------
> -
> 
>  **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.
> +   set multiple times are not consistent. QEMU-5.2.0 fixes this issue in
> commit
> +   f66337bdbfda ("vhost-user: save features of multiqueues if chardev is
> closed").
> 
>  **Implication**
>     Vhost cannot reconnect back to virtio-net/virtio-pmd normally.
> --
> 2.17.1


  reply	other threads:[~2022-05-06  8:41 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-02-21  7:27 [PATCH] doc: remove multi-queue reconnection known issue xuan.ding
2022-02-24  6:28 ` [PATCH v2] doc: fix vhost multi-queue reconnection xuan.ding
2022-03-29 12:46   ` Maxime Coquelin
2022-03-29 13:15     ` Ding, Xuan
2022-04-15  2:08 ` [PATCH v3] " xuan.ding
2022-05-06  8:40   ` Xia, Chenbo [this message]
2022-05-09  3:07     ` Ding, Xuan
2022-05-09  4:11 ` [PATCH v4] " xuan.ding
2022-05-16 12:44   ` Xia, Chenbo

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