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

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Date:   Thu, 24 May 2018 11:23:00 -0700
From:   "Samudrala, Sridhar" <sridhar.samudrala@...el.com>
To:     Or Gerlitz <gerlitz.or@...il.com>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>
Cc:     David Miller <davem@...emloft.net>,
        Linux Netdev List <netdev@...r.kernel.org>,
        oss-drivers@...ronome.com, Jiri Pirko <jiri@...nulli.us>,
        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 5/24/2018 10:04 AM, Or Gerlitz wrote:
> On Thu, May 24, 2018 at 5:22 AM, Jakub Kicinski
> <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 :)
>>
>> John says:
>>
>> This patchset sets up the infrastructure and offloads output actions for
>> when a TC flower rule attempts to egress a packet to a LAG port.
>>
>> Firstly it adds some of the infrastructure required to the flower app and
>> to the nfp core. This includes the ability to change the MAC address of a
>> repr, a function for combining lookup and write to a FW symbol, and the
>> addition of private data to a repr on a per app basis.
>>
>> Patch 6 continues by implementing notifiers that track Linux bonds and
>> communicates to the FW those which enslave reprs, along with the current
>> state of reprs within the bond.
>>
>> Patch 7 ensures bonds are synchronised with FW by receiving and acting
>> upon cmsgs sent to the kernel. These may request that a bond message is
>> retransmitted when FW can process it, or may request a full sync of the
>> bonds defined in the kernel.
>>
>> Patch 8 offloads a flower action when that action requires egressing to a
>> pre-defined Linux bond.
> Does this apply also to non-uplink representors? if yes, what is the use case?
>
> We are looking on supporting uplink lag in sriov switchdev scheme - we refer to
> it as "vf lag" -- b/c the netdev and rdma devices seen by the VF are actually
> subject to HA and/or LAG - I wasn't sure if/how you limit this series
> to uplink reprs

Also, does this patchset support offloading LAG when using vxlan based tunnels?

When using OVS offloading with vxlan,  the encap rule that gets offloaded via tc-flower
has egress port as vxlan device and the decap rule has the in-port as vxlan device, not
the actual egress port.  How are you addressing this issue?