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From: Maxime Coquelin <maxime.coquelin@redhat.com>
To: Kevin Traynor <ktraynor@redhat.com>,
	Adrian Moreno <amorenoz@redhat.com>,
	 dev@dpdk.org
Cc: yinan.wang@intel.com, patrick.fu@intel.com, stable@dpdk.org,
	Chenbo Xia <chenbo.xia@intel.com>,
	Zhihong Wang <zhihong.wang@intel.com>
Subject: Re: [dpdk-stable] [dpdk-dev] [PATCH] virtio-user: fix backend selection if stat fails
Date: Tue, 20 Oct 2020 11:55:10 +0200
Message-ID: <34c221fb-f44b-251b-6183-c6606b0b29b6@redhat.com> (raw)
In-Reply-To: <7aa64791-d71f-c195-f2d6-6262afc29fe7@redhat.com>



On 10/20/20 11:38 AM, Kevin Traynor wrote:
> On 20/10/2020 10:11, Maxime Coquelin wrote:
>>
>>
>> On 10/20/20 11:01 AM, Kevin Traynor wrote:
>>> On 20/10/2020 08:16, Adrian Moreno wrote:
>>>> If stat fails it means the backend must be vhost-user in server mode
>>>>
>>>> Bugzilla ID: 559
>>>> Fixes: f908b22ea47a ("net/virtio: move backend type selection to ethdev")
>>>> Cc: stable@dpdk.org
>>>>
>>>> Signed-off-by: Adrian Moreno <amorenoz@redhat.com>
>>>> ---
>>>>  drivers/net/virtio/virtio_user_ethdev.c | 5 +++--
>>>>  1 file changed, 3 insertions(+), 2 deletions(-)
>>>>
>>>> diff --git a/drivers/net/virtio/virtio_user_ethdev.c b/drivers/net/virtio/virtio_user_ethdev.c
>>>> index 042665bc0..ce74d08ab 100644
>>>> --- a/drivers/net/virtio/virtio_user_ethdev.c
>>>> +++ b/drivers/net/virtio/virtio_user_ethdev.c
>>>> @@ -560,9 +560,10 @@ virtio_user_backend_type(const char *path)
>>>>  	struct stat sb;
>>>>  
>>>>  	if (stat(path, &sb) == -1) {
>>>> -		PMD_INIT_LOG(ERR, "Stat fails: %s (%s)\n", path,
>>>> +		PMD_INIT_LOG(INFO, "Stat fails: %s (%s)\n", path,
>>>>  			     strerror(errno));
>>>
>>> It may be accurate, but a 'fail' in the logs can be confusing for users
>>> when it is an INFO log and normal operation. Suggest to reword to
>>> something softer like 'Unable to stat' or 'Not able to get file status'
>>
>>
>> We may want to:
>> - only return VIRTIO_USER_BACKEND_VHOST_USER if -ENOENT, and log that
>> we assume this is Vhost-user backend in server mode at INFO level.
> 
> It will mean that sometimes the backend type is logged and sometimes
> not, but maybe you make a distinction because there is an assumption
> being made in this case?

I agree it would  make sense to log at INFO level for all backend types.

>> - return VIRTIO_USER_BACKEND_UNKNOWN otherwise and print an error
>> message with the strerror(errno).
>>
> 
> yes, it seems better like that.
> 
>> What do you think?
>>
>>>> -		return VIRTIO_USER_BACKEND_UNKNOWN;
>>>> +		/* Must be vhost-user in server mode */
>>>> +		return VIRTIO_USER_BACKEND_VHOST_USER;
>>>>  	}
>>>>  
>>>>  	if (S_ISSOCK(sb.st_mode)) {
>>>>
>>>
> 


  reply	other threads:[~2020-10-20  9:55 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-20  7:16 [dpdk-stable] " Adrian Moreno
2020-10-20  8:43 ` [dpdk-stable] [dpdk-dev] " Jiang, YuX
2020-10-20  9:01 ` Kevin Traynor
2020-10-20  9:11   ` Maxime Coquelin
2020-10-20  9:38     ` Kevin Traynor
2020-10-20  9:55       ` Maxime Coquelin [this message]
2020-10-20 10:33         ` Adrian Moreno

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