netdev - RE: [PATCH net-next v6 0/5] devlink: Introduce PCI PF, VF ports and attributes

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Date:   Tue, 9 Jul 2019 06:20:52 +0000
From:   Parav Pandit <parav@...lanox.com>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Jiri Pirko <jiri@...lanox.com>,
        Saeed Mahameed <saeedm@...lanox.com>
Subject: RE: [PATCH net-next v6 0/5] devlink: Introduce PCI PF, VF ports and
 attributes

Hi Jakub,

> -----Original Message-----
> From: Jakub Kicinski <jakub.kicinski@...ronome.com>
> Sent: Tuesday, July 9, 2019 11:10 AM
> To: Parav Pandit <parav@...lanox.com>
> Cc: netdev@...r.kernel.org; Jiri Pirko <jiri@...lanox.com>; Saeed Mahameed
> <saeedm@...lanox.com>
> Subject: Re: [PATCH net-next v6 0/5] devlink: Introduce PCI PF, VF ports and
> attributes
> 
> On Mon,  8 Jul 2019 23:17:34 -0500, Parav Pandit wrote:
> > This patchset carry forwards the work initiated in [1] and discussion
> > futher concluded at [2].
> >
> > To improve visibility of representor netdevice, its association with
> > PF or VF, physical port, two new devlink port flavours are added as
> > PCI PF and PCI VF ports.
> >
> > A sample eswitch view can be seen below, which will be futher extended
> > to mdev subdevices of a PCI function in future.
> >
> > Patch-1 moves physical port's attribute to new structure
> > Patch-2 enhances netlink response to consider port flavour
> > Patch-3,4 extends devlink port attributes and port flavour
> > Patch-5 extends mlx5 driver to register devlink ports for PF, VF and
> > physical link.
> 
> The coding leaves something to be desired:
> 
> 1) flavour handling in devlink_nl_port_attrs_put() really calls for a
>    switch statement,
> 2) devlink_port_attrs_.*set() can take a pointer to flavour specific
>    structure instead of attr structure for setting the parameters,
> 3) the "ret" variable there is unnecessary,
> 4) there is inconsistency in whether there is an empty line between
>    if (ret) return; after __devlink_port_attrs_set() and attr setting,
> 5) /* Associated PCI VF for of the PCI PF for this port. */ doesn't
>    read great;
> 6) mlx5 functions should preferably have an appropriate prefix - f.e.
>    register_devlink_port() or is_devlink_port_supported().
> 
Those two static helper functions doesn't need mlx5_ prefix.
ndo ops are prefixed appropriately.

> But I'll leave it to Jiri and Dave to decide if its worth a respin :) Functionally I
> think this is okay.
> 
> Reviewed-by: Jakub Kicinski <jakub.kicinski@...ronome.com>