netdev - RE: [EXT] Re: [PATCH net-next 4/4] qed: Add devlink support for configuration attributes.

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Message-ID: <MN2PR18MB2528065BE3D46045F7EA1888D3FB0@MN2PR18MB2528.namprd18.prod.outlook.com>
Date:   Wed, 3 Jul 2019 12:56:39 +0000
From:   Sudarsana Reddy Kalluru <skalluru@...vell.com>
To:     Jiri Pirko <jiri@...nulli.us>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>
CC:     "davem@...emloft.net" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Michal Kalderon <mkalderon@...vell.com>,
        "Ariel Elior" <aelior@...vell.com>
Subject: RE: [EXT] Re: [PATCH net-next 4/4] qed: Add devlink support for
 configuration attributes.

> -----Original Message-----
> From: Jiri Pirko <jiri@...nulli.us>
> Sent: Thursday, June 20, 2019 7:08 PM
> To: Sudarsana Reddy Kalluru <skalluru@...vell.com>
> Cc: Jakub Kicinski <jakub.kicinski@...ronome.com>; davem@...emloft.net;
> netdev@...r.kernel.org; Michal Kalderon <mkalderon@...vell.com>; Ariel
> Elior <aelior@...vell.com>
> Subject: Re: [EXT] Re: [PATCH net-next 4/4] qed: Add devlink support for
> configuration attributes.
> 
> Thu, Jun 20, 2019 at 02:09:29PM CEST, skalluru@...vell.com wrote:
> >> -----Original Message-----
> >> From: Jakub Kicinski <jakub.kicinski@...ronome.com>
> >> Sent: Tuesday, June 18, 2019 4:24 AM
> >> To: Sudarsana Reddy Kalluru <skalluru@...vell.com>
> >> Cc: davem@...emloft.net; netdev@...r.kernel.org; Michal Kalderon
> >> <mkalderon@...vell.com>; Ariel Elior <aelior@...vell.com>; Jiri Pirko
> >> <jiri@...nulli.us>
> >> Subject: [EXT] Re: [PATCH net-next 4/4] qed: Add devlink support for
> >> configuration attributes.
> >>
> >> External Email
> >>
> >> ---------------------------------------------------------------------
> >> - On Mon, 17 Jun 2019 04:45:28 -0700, Sudarsana Reddy Kalluru wrote:
> >> > This patch adds implementation for devlink callbacks for reading/
> >> > configuring the device attributes.
> >> >
> >> > Signed-off-by: Sudarsana Reddy Kalluru <skalluru@...vell.com>
> >> > Signed-off-by: Ariel Elior <aelior@...vell.com>
> >>
> >> You need to provide documentation for your parameters, plus some of
> >> them look like they should potentially be port params, not device params.
> >
> >Thanks a lot for your review. Will add the required documentation. In case
> of Marvell adapter, any of the device/adapter/port parameters can be
> read/configurable via any PF (ethdev) on the port. Hence adding the
> commands at device level. Hope this is fine.
> 
> No it is not. Port param should be port param.
> 
> Also please be careful not to add any generic param as driver specific.
> 
> Thanks!
Apologies for bringing this topic again. From the driver(s) code paths/'devlink man pages', I understood that devlink-port object is an entity on top of the PCI bus device.
Some drivers say NFP represents vnics (on pci-dev) as a devlink-ports and, some represents (virtual?) ports on the PF/device as devlink-ports.
In the case of Marvell NIC driver, we don't have [port] partitioning of the PCI device. And the config attributes are specific to PCI-device (not the vports/vnics of PF).
Hence I didn't see a need for creating devlink-port objects in the system for Marvell NICs. And planning to add the config attributes to 'devlink-dev' object.
Please let me know if my understanding and the proposal is ok?

Code paths which use devlink-port:
   mlx4_load_one(struct pci_dev *pdev):  mlx4_init_port_info(1 .. dev->caps.num_ports) -> devlink_port_register()
   nfp_net_pf_init_vnics (1 .. pf->vnics) -> nfp_net_pf_init_vnic() -> nfp_devlink_port_register()
   nsim_dev_probe (1 .. nsim_bus_dev->port_count) -> __nsim_dev_port_add() -> devlink_port_register ()

man page for 'devlink-port':
   devlink port set - change devlink port attributes
       DEV/PORT_INDEX - specifies the devlink port to operate on.

       devlink port show pci/0000:01:00.0/1
           Shows the state of specified devlink port.