From: "Chen, Junjie J" <junjie.j.chen@intel.com>
To: "Tan, Jianfeng" <jianfeng.tan@intel.com>,
"maxime.coquelin@redhat.com" <maxime.coquelin@redhat.com>,
"mtetsuyah@gmail.com" <mtetsuyah@gmail.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>
Subject: Re: [dpdk-dev] [PATCH] net/vhost: fix segfault when creating vdev dynamically
Date: Tue, 27 Mar 2018 09:24:40 +0000 [thread overview]
Message-ID: <AA85A5A5E706C44BACB0BEFD5AC08BF63138CD9F@SHSMSX101.ccr.corp.intel.com> (raw)
In-Reply-To: <20388d18-796f-7dd5-e596-f8cc290063d0@intel.com>
> >
> >> On 3/28/2018 12:05 AM, Junjie Chen wrote:
> >>> when creating vdev dynamically, vhost pmd driver start directly
> >>> without checking TX/RX queues ready or not, and thus cause
> >>> segmentation fault when vhost library accessing queues. This patch
> >>> add flag to check whether queues setup or not, and add driver start
> >>> call into dev_start to allow user start it after setting up queue.
> >> The issue is clear now. But this patch just puts the situation before below
> fix:
> >> "it doesn't create the actual datagram socket until you call .dev_start()."
> > No, if the queue exist, the datagram socket still get created in vhost_create
> API, since the vhost_driver_register still exist in vhost_create.
>
> The queue can never be created, as it's still not probed.
I think we need to separate this into two cases:
Statically create vdev, the datagram recreate logical is still there since queues are exist already, this patch doesn't change anything.
Dynamic create vdev, as you pointed out, queue can never be created, while this should be not valid since In normal process of creating vdev dynamically, we always need to config queues. Correct me if I'm wrong.
In summary, I think the previously commit fixes the static code path and this patch fixes the dynamic code path (we need to at least setup queue once).
next prev parent reply other threads:[~2018-03-27 9:24 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-27 16:05 Junjie Chen
2018-03-27 8:56 ` Tan, Jianfeng
2018-03-27 9:02 ` Chen, Junjie J
2018-03-27 9:10 ` Tan, Jianfeng
2018-03-27 9:24 ` Chen, Junjie J [this message]
2018-03-27 9:42 ` Tan, Jianfeng
2018-03-27 10:18 ` Chen, Junjie J
2018-03-27 13:54 ` Tan, Jianfeng
2018-03-27 11:28 ` Maxime Coquelin
2018-03-27 14:01 ` Tan, Jianfeng
2018-03-29 12:35 ` Maxime Coquelin
2018-03-29 15:35 ` [dpdk-dev] [PATCH v2] " Junjie Chen
2018-03-29 13:16 ` Maxime Coquelin
2018-03-30 6:58 ` [dpdk-dev] [PATCH v3] " Junjie Chen
2018-03-30 7:32 ` Yang, Zhiyong
2018-03-30 7:36 ` Maxime Coquelin
2018-03-30 7:35 ` Maxime Coquelin
2018-03-30 7:43 ` Maxime Coquelin
2018-04-09 12:37 ` Jens Freimann
2018-04-10 8:11 ` Chen, Junjie J
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