netdev - Re: [net-next PATCH v2 5/9] octeontx2-af: Add packet path between representor and VF

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Date: Thu, 25 Apr 2024 08:59:31 +0200
From: Jiri Pirko <jiri@...nulli.us>
To: Sunil Kovvuri Goutham <sgoutham@...vell.com>
Cc: Geethasowjanya Akula <gakula@...vell.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kuba@...nel.org" <kuba@...nel.org>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"pabeni@...hat.com" <pabeni@...hat.com>,
	"edumazet@...gle.com" <edumazet@...gle.com>,
	Subbaraya Sundeep Bhatta <sbhatta@...vell.com>,
	Hariprasad Kelam <hkelam@...vell.com>
Subject: Re: [net-next PATCH v2 5/9] octeontx2-af: Add packet path between
 representor and VF

Thu, Apr 25, 2024 at 08:01:47AM CEST, sgoutham@...vell.com wrote:
>
>
>> -----Original Message-----
>> From: Jiri Pirko <jiri@...nulli.us>
>> Sent: Tuesday, April 23, 2024 6:39 PM
>> To: Geethasowjanya Akula <gakula@...vell.com>
>> Cc: netdev@...r.kernel.org; linux-kernel@...r.kernel.org; kuba@...nel.org;
>> davem@...emloft.net; pabeni@...hat.com; edumazet@...gle.com; Sunil
>> Kovvuri Goutham <sgoutham@...vell.com>; Subbaraya Sundeep Bhatta
>> <sbhatta@...vell.com>; Hariprasad Kelam <hkelam@...vell.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@...vell.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.

Okay, makes sense.


>
>Thanks,
>Sunil.
>
>
>