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From: Vincent JARDIN <vincent.jardin@6wind.com>
To: Thomas Monjalon <thomas.monjalon@6wind.com>,
	 "Ouyang, Changchun" <changchun.ouyang@intel.com>
Cc: dev@dpdk.org
Subject: Re: [dpdk-dev] [PATCH 2/2] virtio: allow running w/o vlan filtering
Date: Tue, 04 Aug 2015 14:51:48 +0200
Message-ID: <55C0B564.1090509@6wind.com> (raw)
In-Reply-To: <205454145.ebl7zG6qks@xps13>

Thomas, Changchun,

On 29/07/2015 14:56, Thomas Monjalon wrote:
> Back on this old patch, it seems justified but nobody agreed.
>
> --- a/lib/librte_pmd_virtio/virtio_ethdev.c
> +++ b/lib/librte_pmd_virtio/virtio_ethdev.c
> @@ -1288,7 +1288,6 @@ virtio_dev_configure(struct rte_eth_dev *dev)
>              && !vtpci_with_feature(hw, VIRTIO_NET_F_CTRL_VLAN)) {
>                  PMD_DRV_LOG(NOTICE,
>                              "vlan filtering not available on this host");
> -               return -ENOTSUP;
>          }
>
> 2015-03-06 08:24, Stephen Hemminger:
>> "Ouyang, Changchun" <changchun.ouyang@intel.com> wrote:
>>>> From: Stephen Hemminger
>>>> Vlan filtering is an option, and not a requirement.
>>>> If host does not support filtering then it can be done in software.

+1 with Stephen, remove return -ENOTSUP;

applications must not fail, software stacks will handle it. We did 
experiment some issues when testpmd was failing while it was supposed to 
run. A notice would be good enough.


>>>
>>> The question is that guest only send command, no real action to do the vlan filter.
>>> So if both host and guest have no real action for vlan filter, who will do it?
>>
>> The virtio driver has features.
>> Guest can not send commands to host where feature bit not enabled.
>> Application can call filter_set and check if filter worked or not.
>>
>> Our code already had to do MAC and VLAN validation of incoming packets
>> therefore if hardware can't do vlan match, there is no problem.
>> I would expect other applications would do the same thing.
>>
>> Failing during configuration is bad. DPDK API should never force
>> application to play "guess the working configuration" with the device
>> driver or do string match on "which device is this anyway"

Agree, it is not a failure of a configuration, it is a failure of 
negotiation of virtio's capabilities.

Let's use another example: we do not expect a guest kernel to panic() 
because it is not properly negotiated? So why should a DPDK application 
fail and return -ENOTSUP?

Thank you,
   Vincent

  parent reply	other threads:[~2015-08-04 12:51 UTC|newest]

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-03-06  0:45 [dpdk-dev] [PATCH 0/2] virtio: bugfixes Stephen Hemminger
2015-03-06  0:45 ` [dpdk-dev] [PATCH 1/2] virtio: initialize iopl when device is initialized Stephen Hemminger
2015-03-06  3:41   ` Ouyang, Changchun
2015-03-06 16:20     ` Stephen Hemminger
2015-03-06 16:33       ` David Marchand
2015-03-06 16:55         ` Stephen Hemminger
2015-03-06 22:04           ` David Marchand
2015-03-06 23:43             ` Stephen Hemminger
2015-03-07  6:53               ` David Marchand
2015-03-09 11:05       ` David Marchand
2015-03-09 14:56         ` [dpdk-dev] [PATCH 0/2] fix virtio interrupt handling David Marchand
2015-03-09 14:56           ` [dpdk-dev] [PATCH 1/2] eal/linux: move plugin load to very start of eal init David Marchand
2015-03-09 15:21             ` Neil Horman
     [not found]               ` <CALwxeUs4hPbYDPBUfz9u2AoiCoj_wwTsAyj=_1xxzuT6LLW6nw@mail.gmail.com>
2015-03-10 10:55                 ` Neil Horman
2015-10-14  0:05                   ` Stephen Hemminger
2015-10-14  9:55                     ` David Marchand
2015-03-09 14:56           ` [dpdk-dev] [PATCH 2/2] virtio: change io privilege level as early as possible David Marchand
2015-03-10 13:14             ` Neil Horman
2015-09-29 19:25               ` Stephen Hemminger
2015-09-30  8:28                 ` David Marchand
2015-09-30 14:52                   ` Neil Horman
2015-09-30 15:37                     ` Thomas Monjalon
2015-09-30 17:26                       ` Stephen Hemminger
2015-10-01 11:25                       ` Neil Horman
2015-10-12 20:08                         ` Stephen Hemminger
2015-10-14  0:07                         ` Stephen Hemminger
2015-10-14  8:00                           ` David Marchand
2015-10-14  9:49                             ` David Marchand
2015-10-14  9:50                               ` [dpdk-dev] [PATCH] eal: move interrupt init after device init David Marchand
2015-10-14 11:32                                 ` David Marchand
2015-10-20 21:22                                   ` Thomas Monjalon
2015-07-29 17:26       ` [dpdk-dev] [PATCH 1/2] virtio: initialize iopl when device is initialized Thomas Monjalon
2015-03-06  0:45 ` [dpdk-dev] [PATCH 2/2] virtio: allow running w/o vlan filtering Stephen Hemminger
2015-03-06  3:39   ` Ouyang, Changchun
2015-03-06 16:24     ` Stephen Hemminger
2015-07-29 12:56       ` Thomas Monjalon
2015-07-30  1:23         ` Ouyang, Changchun
2015-08-04 12:51         ` Vincent JARDIN [this message]
2015-08-05  1:01           ` Ouyang, Changchun
2015-08-05  1:22             ` Stephen Hemminger
2015-08-05 10:49             ` Vincent JARDIN
2015-10-21 13:58               ` Thomas Monjalon
2017-02-15  8:38                 ` Thomas Monjalon

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