netdev - RE: [PATCH iwl-next v4 06/13] ice: Implement basic eswitch bridge setup

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Message-ID: <MW4PR11MB5776D4B4B3CB687ACCBF49E4FD4DA@MW4PR11MB5776.namprd11.prod.outlook.com>
Date: Mon, 5 Jun 2023 10:47:09 +0000
From: "Drewek, Wojciech" <wojciech.drewek@...el.com>
To: Simon Horman <simon.horman@...igine.com>
CC: "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>, "Lobakin, Aleksander"
	<aleksander.lobakin@...el.com>, "Ertman, David M" <david.m.ertman@...el.com>,
	"michal.swiatkowski@...ux.intel.com" <michal.swiatkowski@...ux.intel.com>,
	"marcin.szycik@...ux.intel.com" <marcin.szycik@...ux.intel.com>,
	"Chmielewski, Pawel" <pawel.chmielewski@...el.com>, "Samudrala, Sridhar"
	<sridhar.samudrala@...el.com>, "pmenzel@...gen.mpg.de"
	<pmenzel@...gen.mpg.de>, "dan.carpenter@...aro.org"
	<dan.carpenter@...aro.org>
Subject: RE: [PATCH iwl-next v4 06/13] ice: Implement basic eswitch bridge
 setup



> -----Original Message-----
> From: Simon Horman <simon.horman@...igine.com>
> Sent: niedziela, 4 czerwca 2023 15:59
> To: Drewek, Wojciech <wojciech.drewek@...el.com>
> Cc: intel-wired-lan@...ts.osuosl.org; netdev@...r.kernel.org; Lobakin, Aleksander <aleksander.lobakin@...el.com>; Ertman, David M
> <david.m.ertman@...el.com>; michal.swiatkowski@...ux.intel.com; marcin.szycik@...ux.intel.com; Chmielewski, Pawel
> <pawel.chmielewski@...el.com>; Samudrala, Sridhar <sridhar.samudrala@...el.com>; pmenzel@...gen.mpg.de;
> dan.carpenter@...aro.org
> Subject: Re: [PATCH iwl-next v4 06/13] ice: Implement basic eswitch bridge setup
> 
> On Wed, May 24, 2023 at 02:21:14PM +0200, Wojciech Drewek wrote:
> > With this patch, ice driver is able to track if the port
> > representors or uplink port were added to the linux bridge in
> > switchdev mode. Listen for NETDEV_CHANGEUPPER events in order to
> > detect this. ice_esw_br data structure reflects the linux bridge
> > and stores all the ports of the bridge (ice_esw_br_port) in
> > xarray, it's created when the first port is added to the bridge and
> > freed once the last port is removed. Note that only one bridge is
> > supported per eswitch.
> >
> > Bridge port (ice_esw_br_port) can be either a VF port representor
> > port or uplink port (ice_esw_br_port_type). In both cases bridge port
> > holds a reference to the VSI, VF's VSI in case of the PR and uplink
> > VSI in case of the uplink. VSI's index is used as an index to the
> > xarray in which ports are stored.
> >
> > Add a check which prevents configuring switchdev mode if uplink is
> > already added to any bridge. This is needed because we need to listen
> > for NETDEV_CHANGEUPPER events to record if the uplink was added to
> > the bridge. Netdevice notifier is registered after eswitch mode
> > is changed top switchdev.
> 
> Hi Wojciech,
> 
> Does the uplink here model both a physical port and the PF link between the
> host and the NIC?  If so, then I think this is ok.
> 
> I mention this because I am more familiar with a model where these are
> separated, in which case I think it would probably be an uplink representor
> that is added to the bridge. And I want to make sure make sure that I
> understand the model used here correctly.

In our design we don't have separate uplink rpresentor. PF netdev serves as uplink
repr once the eswitch mode is changed to switchdev.