netdev - Re: Exposing device ACL setting through devlink

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Date:   Fri, 18 Sep 2020 18:20:34 -0500
From:   Thomas Falcon <tlfalcon@...ux.ibm.com>
To:     Jiri Pirko <jiri@...nulli.us>
Cc:     Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        jiri@...dia.com
Subject: Re: Exposing device ACL setting through devlink


On 9/18/20 2:20 AM, Jiri Pirko wrote:
> Thu, Sep 17, 2020 at 10:31:10PM CEST, tlfalcon@...ux.ibm.com wrote:
>> On 9/10/20 2:00 AM, Jiri Pirko wrote:
>>> Tue, Sep 08, 2020 at 08:27:13PM CEST, tlfalcon@...ux.ibm.com wrote:
>>>> On 9/4/20 5:37 PM, Jakub Kicinski wrote:
>>>>> On Fri, 4 Sep 2020 10:31:41 +0200 Jiri Pirko wrote:
>>>>>> Thu, Sep 03, 2020 at 07:59:45PM CEST, tlfalcon@...ux.ibm.com wrote:
>>>>>>> Hello, I am trying to expose MAC/VLAN ACL and pvid settings for IBM
>>>>>>> VNIC devices to administrators through devlink (originally through
>>>>>>> sysfs files, but that was rejected in favor of devlink). Could you
>>>>>>> give any tips on how you might go about doing this?
>>>>>> Tom, I believe you need to provide more info about what exactly do you
>>>>>> need to setup. But from what you wrote, it seems like you are looking
>>>>>> for bridge/tc offload. The infra is already in place and drivers are
>>>>>> implementing it. See mlxsw for example.
>>>>> I think Tom's use case is effectively exposing the the VF which VLANs
>>>>> and what MAC addrs it can use. Plus it's pvid. See:
>>>>>
>>>>> https://www.spinics.net/lists/netdev/msg679750.html
>>>> Thanks, Jakub,
>>>>
>>>> Right now, the use-case is to expose the allowed VLAN's and MAC addresses and
>>>> the VF's PVID. Other use-cases may be explored later on though.
>>> Who is configuring those?
>>>
>>> What does mean "allowed MAC address"? Does it mean a MAC address that VF
>>> can use to send packet as a source MAC?
>>>
>>> What does mean "allowed VLAN"? VF is sending vlan tagged frames and only
>>> some VIDs are allowed.
>>>
>>> Pardon my ignorance, this may be routine in the nic world. However I
>>> find the desc very vague. Please explain in details, then we can try to
>>> find fitting solution.
>>>
>>> Thanks!
>> These MAC or VLAN ACL settings are configured on the Power Hypervisor.
>>
>> The rules for a VF can be to allow or deny all MAC addresses or VLAN ID's or
>> to allow a specified list of MAC address and VLAN ID's. The interface allows
>> or denies frames based on whether the ID in the VLAN tag or the source MAC
>> address is included in the list of allowed VLAN ID's or MAC addresses
>> specified during creation of the VF.
> At which point are you doing this ACL? Sounds to me, like this is the
> job of "a switch" which connects VFs and physical port. Then, you just
> need to configure this switch to pass/drop packets according to match.
> And that is what there is already implemented with TC-flower/u32 + actions
> and bridge offload.
>
Yes, this the filtering is done on a virtual switch in Power firmware. I 
am really just trying to report the ACL list's configured at the 
firmware level to users on the guest OS.

Tom

>> Thanks for your help,
>>
>> Tom
>>