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SubjectRe: [net-next PATCH v2 5/9] octeontx2-af: Add packet path between representor and VF
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> -----Original Message-----
> From: Jiri Pirko <jiri@resnulli.us>
> Sent: Tuesday, April 23, 2024 6:39 PM
> To: Geethasowjanya Akula <gakula@marvell.com>
> Cc: netdev@vger.kernel.org; linux-kernel@vger.kernel.org; kuba@kernel.org;
> davem@davemloft.net; pabeni@redhat.com; edumazet@google.com; Sunil
> Kovvuri Goutham <sgoutham@marvell.com>; Subbaraya Sundeep Bhatta
> <sbhatta@marvell.com>; Hariprasad Kelam <hkelam@marvell.com>
> Subject: [EXTERNAL] Re: [net-next PATCH v2 5/9] octeontx2-af: Add packet
> path between representor and VF
>
> Mon, Apr 22, 2024 at 11:53:57AM CEST, gakula@marvell.com wrote:
> >This patch installs tcam rules to stree traffic representors and VF
> >when swicthdev mode is set. To support this a HW loopback channel is
> >reserved. Through this channel packet are routed between representor
> >and VFs. "ESW_CFG" mbox is defined to notify AF for installing rules.
>
> This sounds very wrong. In switchdev mode, there is no implicit packet
> forwarding. User configures that, either by setting up TC filters to
> match/forward packets, putting representors in a bridge, etc.
> Basically the driver offloads whatever configuration on representors the user
> does, in case it supports it.
>
> Please make sure you follow that.

In our HW, there is no in-built switch which will forward pkts between representee and representor.
When representor is put under a bridge and pkts needs to be sent to representee, then pkts from
representor are sent on a HW internal loopback channel, which again will be punted to ingress
pkt parser. Now the rules that this patch installs are the MCAM filters/rules which will match against
these pkts and forward them to representee.

To be more clear the rules that this patch installs are for basic representor <-=> representee path
similar to Tun/TAP between VM and Host. Now for any further offloads (eg: L2 or ConnTrk)
user will have to install explicit rules via TC filters.

Thanks,
Sunil.




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