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To: Tiwei Bie <tiwei.bie@intel.com>
Cc: Qi Zhang <qi.z.zhang@intel.com>, Xiao Wang <xiao.w.wang@intel.com>,
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References: <20180313180534.232296-1-ferruh.yigit@intel.com>
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From: Ferruh Yigit <ferruh.yigit@intel.com>
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Message-ID: <bd760785-67c6-3ff2-027f-79fd51438902@intel.com>
Date: Tue, 17 Apr 2018 12:26:42 +0100
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Subject: Re: [dpdk-dev] [PATCH] drivers/net: update link status
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X-List-Received-Date: Tue, 17 Apr 2018 11:26:49 -0000
On 4/17/2018 5:54 AM, Tiwei Bie wrote:
> On Mon, Apr 16, 2018 at 05:10:24PM +0100, Ferruh Yigit wrote:
>> On 4/14/2018 11:55 AM, Tiwei Bie wrote:
>>> On Fri, Apr 13, 2018 at 10:53:55PM +0100, Ferruh Yigit wrote:
>>>> On 4/10/2018 4:41 PM, Tiwei Bie wrote:
>>>>> On Tue, Mar 13, 2018 at 06:05:34PM +0000, Ferruh Yigit wrote:
>>>>>> Update link status related feature document items and minor updates in
>>>>>> some link status related functions.
>>>>>>
>>>>>> Signed-off-by: Ferruh Yigit <ferruh.yigit@intel.com>
>>>>>> ---
>>>>>> doc/guides/nics/features/fm10k.ini | 2 ++
>>>>>> doc/guides/nics/features/fm10k_vf.ini | 2 ++
>>>>>> doc/guides/nics/features/i40e_vf.ini | 1 +
>>>>>> doc/guides/nics/features/igb_vf.ini | 1 +
>>>>>> doc/guides/nics/features/qede.ini | 1 -
>>>>>> doc/guides/nics/features/qede_vf.ini | 1 -
>>>>>> doc/guides/nics/features/vhost.ini | 2 --
>>>>>> doc/guides/nics/features/virtio_vec.ini | 1 +
>>>>>> drivers/net/e1000/em_ethdev.c | 2 +-
>>>>>> drivers/net/ena/ena_ethdev.c | 2 +-
>>>>>> drivers/net/fm10k/fm10k_ethdev.c | 6 ++----
>>>>>> drivers/net/i40e/i40e_ethdev_vf.c | 2 +-
>>>>>> drivers/net/ixgbe/ixgbe_ethdev.c | 2 +-
>>>>>> drivers/net/mlx4/mlx4_ethdev.c | 2 +-
>>>>>> drivers/net/mlx5/mlx5_ethdev.c | 2 +-
>>>>>> 15 files changed, 15 insertions(+), 14 deletions(-)
>>>>> [...]
>>>>>> diff --git a/doc/guides/nics/features/vhost.ini b/doc/guides/nics/features/vhost.ini
>>>>>> index dffd1f493..31302745a 100644
>>>>>> --- a/doc/guides/nics/features/vhost.ini
>>>>>> +++ b/doc/guides/nics/features/vhost.ini
>>>>>> @@ -4,8 +4,6 @@
>>>>>> ; Refer to default.ini for the full list of available PMD features.
>>>>>> ;
>>>>>> [Features]
>>>>>> -Link status = Y
>>>>>> -Link status event = Y
>>>>>
>>>>> I think vhost PMD supports above features.
>>>>
>>>> I am not able to find where it is supported.
>>>>
>>>> Some virtual PMDs report fixed link, with empty link_update() dev_ops, and they
>>>> are not reported as supporting Link status, as far as I can see vhost also one
>>>> of them.
>>>>
>>>> And for Link status event, PMD needs to support LSC interrupts and should
>>>> register interrupt handler for it, which I can't find for vhost.
>>>>
>>>> I will send next version without updating above one, please point me where these
>>>> support added if I missed them.
>>>
>>> In drivers/net/vhost/rte_eth_vhost.c you could find below functions:
>>>
>>> static int
>>> new_device(int vid)
>>> {
>>> ......
>>>
>>> eth_dev->data->dev_link.link_status = ETH_LINK_UP;
>>>
>>> ......
>>>
>>> _rte_eth_dev_callback_process(eth_dev, RTE_ETH_EVENT_INTR_LSC, NULL);
>>>
>>> ......
>>> }
>>>
>>> static void
>>> destroy_device(int vid)
>>> {
>>> ......
>>>
>>> eth_dev->data->dev_link.link_status = ETH_LINK_DOWN;
>>>
>>> ......
>>>
>>> _rte_eth_dev_callback_process(eth_dev, RTE_ETH_EVENT_INTR_LSC, NULL);
>>>
>>> ......
>>> }
>>>
>>> They are the callbacks for vhost library.
>>>
>>> When a frontend (e.g. QEMU) is connected to this vhost backend
>>> and the frontend virtio device becomes ready, new_device() will
>>> be called by the vhost library, and the link status will be
>>> updated to UP.
>>>
>>> And when e.g. the connection is closed, destroy_device() will be
>>> called by the vhost library, and the link status will be updated
>>> to DOWN.
>>
>>
>> Got it. This behavior is similar for virtual PMDs. Provide static link
>> information and update link as UP during start and update it as DOWN during stop.
>
> No, the link status isn't updated during vhost PMD start
> and stop. When the vhost PMD has been started, the link
> status still may be DOWN. The link status becomes UP only
> when the QEMU (it's another virtual machine process which
> has a virtio device) connects to this vhost PMD via a UNIX
> socket and the virtio driver in the virtual machine has
> setup the virtio device of the virtual machine.
>
> So if vhost PMD reports the link status as DOWN, it means
> there is no QEMU (virtual machine) connects to it or the
> virtio device in the virtual machine hasn't been setup.
> (PS. The frontend can also be virtio-user PMD besides QEMU)
I believe announcing link feature reporting on virtual pmds still in gray area,
but because of qemu involvement in vhost case, I will keep link feature but will
drop link event.
Will send a new patch to reflect this.
Thanks,
ferruh
>
> Thanks
>
>>
>> Other virtual PMDs doesn't report this feature, so removed from vhost as well
>> for consistency.
>>
>>>
>>> So vhost PMD reports meaningful link status and also generates
>>> link status events.
>>
>> Yes PMD process user callbacks on link change [1], but I am not sure that is
>> what meant from "link status event", what I understand is link interrupts
>> supported in PMD level which seems not the case for vhost.
>>
>> [1]
>> This is something else but why calling user callback in link update is in PMD
>> discretion, shouldn't it be something done automatically in ethdev layer, somehow.
>>
>>>
>>> Thanks
>>>
>>