netdev - Re: Exposing device ACL setting through devlink

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Date:   Sun, 20 Sep 2020 17:21:36 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Thomas Falcon <tlfalcon@...ux.ibm.com>
Cc:     Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        jiri@...dia.com
Subject: Re: Exposing device ACL setting through devlink

Sat, Sep 19, 2020 at 01:20:34AM CEST, tlfalcon@...ux.ibm.com wrote:
>
>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.

We have means to model switches properly in linux and offload to them.
I advise you to do that.


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