netdev - Re: [PATCH net-next 0/8] nfp: offload LAG for tc flower egress

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Date:   Tue, 29 May 2018 15:08:48 +0100
From:   John Hurley <john.hurley@...ronome.com>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>
Cc:     Jiri Pirko <jiri@...nulli.us>, David Miller <davem@...emloft.net>,
        Linux Netdev List <netdev@...r.kernel.org>,
        oss-drivers@...ronome.com, Jay Vosburgh <j.vosburgh@...il.com>,
        Veaceslav Falico <vfalico@...il.com>,
        Andy Gospodarek <andy@...yhouse.net>
Subject: Re: [PATCH net-next 0/8] nfp: offload LAG for tc flower egress

On Sat, May 26, 2018 at 3:47 AM, Jakub Kicinski
<jakub.kicinski@...ronome.com> wrote:
> On Fri, 25 May 2018 08:48:09 +0200, Jiri Pirko wrote:
>> Thu, May 24, 2018 at 04:22:47AM CEST, jakub.kicinski@...ronome.com wrote:
>> >Hi!
>> >
>> >This series from John adds bond offload to the nfp driver.  Patch 5
>> >exposes the hash type for NETDEV_LAG_TX_TYPE_HASH to make sure nfp
>> >hashing matches that of the software LAG.  This may be unnecessarily
>> >conservative, let's see what LAG maintainers think :)
>>
>> So you need to restrict offload to only certain hash algo? In mlxsw, we
>> just ignore the lag setting and do some hw default hashing. Would not be
>> enough? Note that there's a good reason for it, as you see, in team, the
>> hashing is done in a BPF function and could be totally arbitrary.
>> Your patchset effectively disables team offload for nfp.
>
> My understanding is that the project requirements only called for L3/L4
> hash algorithm offload, hence the temptation to err on the side of
> caution and not offload all the bond configurations.  John can provide
> more details.  Not being able to offload team is unfortunate indeed.

Hi Jiri,
Yes, as Jakub mentions, we restrict ourselves to L3/L4 hash algorithm
as this is currently what is supported in fw.
Hopefully this will change as fw features are expanded.
I understand the issue this presents with offloading team.
Perhaps resorting to a default hw hash for team is acceptable.
John