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From: Tiwei Bie <tiwei.bie@intel.com>
To: Maxime Coquelin <maxime.coquelin@redhat.com>
Cc: dev@dpdk.org, zhihong.wang@intel.com, jfreimann@redhat.com,
	nicknickolaev@gmail.com, i.maximets@samsung.com,
	bruce.richardson@intel.com, alejandro.lucero@netronome.com,
	dgilbert@redhat.com, stable@dpdk.org
Subject: Re: [dpdk-dev] [PATCH v4 04/19] vhost: fix payload size of reply
Date: Tue, 9 Oct 2018 19:02:08 +0800	[thread overview]
Message-ID: <20181009110207.GA32180@debian> (raw)
In-Reply-To: <a45f8691-f5bf-5546-122b-0c5a55d59726@redhat.com>

On Tue, Oct 09, 2018 at 12:34:28PM +0200, Maxime Coquelin wrote:
> On 10/09/2018 12:30 PM, Maxime Coquelin wrote:
> > On 10/09/2018 12:21 PM, Tiwei Bie wrote:
> > > On Mon, Oct 08, 2018 at 05:25:42PM +0200, Maxime Coquelin wrote:
> > > > QEMU doesn't expect any payload for the reply of
> > > > VHOST_USER_SET_LOG_BASE request, so don't send any.
> > > > Note that the Vhost-user specification isn't clear about
> > > > it and would need to be fixed.
> > > > 
> > > > Fixes: 54f9e32305d4 ("vhost: handle dirty pages logging request")
> > > > Cc: stable@dpdk.org
> > > > 
> > > > Reported-by: Ilya Maximets <i.maximets@samsung.com>
> > > > Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
> > > > Acked-by: Ilya Maximets <i.maximets@samsung.com>
> > > > ---
> > > >   lib/librte_vhost/vhost_user.c | 6 +++++-
> > > >   1 file changed, 5 insertions(+), 1 deletion(-)
> > > > 
> > > > diff --git a/lib/librte_vhost/vhost_user.c
> > > > b/lib/librte_vhost/vhost_user.c
> > > > index 7f3e86778..71a0e7dd7 100644
> > > > --- a/lib/librte_vhost/vhost_user.c
> > > > +++ b/lib/librte_vhost/vhost_user.c
> > > > @@ -1296,7 +1296,11 @@ vhost_user_set_log_base(struct virtio_net
> > > > **pdev, struct VhostUserMsg *msg)
> > > >       dev->log_base = dev->log_addr + off;
> > > >       dev->log_size = size;
> > > > -    msg->size = sizeof(msg->payload.u64);
> > > > +    /*
> > > > +     * The spec is not clear about it (yet), but QEMU doesn't expect
> > > > +     * any payload in the reply.
> > > > +     */
> > > > +    msg->size = 0;
> > > 
> > > I think the spec is clear about it that no payload is
> > > expected in the reply:
> > > 
> > > https://github.com/qemu/qemu/blob/7c69b7c84964/docs/interop/vhost-user.txt#L496
> > > 
> > It isn't really clear because there are two cases[0]:
> > 1. VHOST_USER_PROTOCOL_F_LOG_SHMFD not negotiated: In this case no reply
> >     has to be sent.
> > 2. VHOST_USER_PROTOCOL_F_LOG_SHMFD negotiated: In this case reply with
> >     empty payload hsa to be sent.
> > 
> > [0]: https://github.com/qemu/qemu/blob/7c69b7c849641a39ba3defa40d384a2ba24cd7a2/docs/interop/vhost-user.txt#L177
> > 
> 
> And I would add that N/A isn't clear, because SET_VRING_ADDR specifies
> N/A as slave payload, whereas the implementation does not implement a
> reply.

Good point.

> 
> > > But below line in the spec needs to be fixed:
> > > 
> > > https://github.com/qemu/qemu/blob/7c69b7c84964/docs/interop/vhost-user.txt#L495
> > > 
> > 
> > Indeed.
> > 
> > > 
> > > >       return VH_RESULT_REPLY;
> > > >   }
> > > > -- 
> > > > 2.17.1
> > > > 

  reply	other threads:[~2018-10-09 11:07 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-10-08 15:25 [dpdk-dev] [PATCH v4 00/19] vhost: add postcopy live-migration support Maxime Coquelin
2018-10-08 15:25 ` [dpdk-dev] [PATCH v4 01/19] vhost: fix messages error checks Maxime Coquelin
2018-10-09  8:03   ` Tiwei Bie
2018-10-09 12:20     ` Maxime Coquelin
2018-10-09 12:54       ` Tiwei Bie
2018-10-09 17:53         ` Maxime Coquelin
2018-10-08 15:25 ` [dpdk-dev] [PATCH v4 02/19] vhost: fix return code of messages requiring replies Maxime Coquelin
2018-10-09  8:05   ` Tiwei Bie
2018-10-08 15:25 ` [dpdk-dev] [PATCH v4 03/19] vhost: clarify reply-ack in case a reply was already sent Maxime Coquelin
2018-10-09  8:12   ` Tiwei Bie
2018-10-08 15:25 ` [dpdk-dev] [PATCH v4 04/19] vhost: fix payload size of reply Maxime Coquelin
2018-10-09 10:21   ` Tiwei Bie
2018-10-09 10:30     ` Maxime Coquelin
2018-10-09 10:34       ` Maxime Coquelin
2018-10-09 11:02         ` Tiwei Bie [this message]
2018-10-08 15:25 ` [dpdk-dev] [PATCH v4 05/19] vhost: fix error handling when mem table gets updated Maxime Coquelin
2018-10-09 11:35   ` Tiwei Bie
2018-10-09 11:47     ` Maxime Coquelin
2018-10-08 15:25 ` [dpdk-dev] [PATCH v4 06/19] vhost: define postcopy protocol flag Maxime Coquelin
2018-10-09 11:41   ` Tiwei Bie
2018-10-09 11:47     ` Maxime Coquelin
2018-10-08 15:25 ` [dpdk-dev] [PATCH v4 07/19] vhost: add number of fds to vhost-user messages and use it Maxime Coquelin
2018-10-08 15:25 ` [dpdk-dev] [PATCH v4 08/19] vhost: pass socket fd to message handling callbacks Maxime Coquelin
2018-10-08 15:25 ` [dpdk-dev] [PATCH v4 09/19] vhost: enable fds passing when sending vhost-user messages Maxime Coquelin
2018-10-08 15:25 ` [dpdk-dev] [PATCH v4 10/19] vhost: add config flag for postcopy feature Maxime Coquelin
2018-10-08 15:25 ` [dpdk-dev] [PATCH v4 11/19] vhost: introduce postcopy's advise message Maxime Coquelin
2018-10-08 16:22   ` Ilya Maximets
2018-10-09  7:59     ` Maxime Coquelin
2018-10-08 15:25 ` [dpdk-dev] [PATCH v4 12/19] vhost: add support for postcopy's listen message Maxime Coquelin
2018-10-08 15:25 ` [dpdk-dev] [PATCH v4 13/19] vhost: register new regions with userfaultfd Maxime Coquelin
2018-10-08 15:25 ` [dpdk-dev] [PATCH v4 14/19] vhost: avoid useless VhostUserMemory copy Maxime Coquelin
2018-10-08 15:25 ` [dpdk-dev] [PATCH v4 15/19] vhost: send userfault range addresses back to qemu Maxime Coquelin
2018-10-08 15:25 ` [dpdk-dev] [PATCH v4 16/19] vhost: add support to postcopy's end request Maxime Coquelin
2018-10-08 15:25 ` [dpdk-dev] [PATCH v4 17/19] vhost: enable postcopy protocol feature Maxime Coquelin
2018-10-08 15:25 ` [dpdk-dev] [PATCH v4 18/19] vhost: add flag to enable postcopy live-migration Maxime Coquelin
2018-10-08 15:25 ` [dpdk-dev] [PATCH v4 19/19] net/vhost: add parameter to enable postcopy support Maxime Coquelin

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