netdev - Re: [patch net-next 00/12] net: expose switch ID via devlink

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Date:   Fri, 29 Mar 2019 07:49:05 +0100
From:   Jiri Pirko <jiri@...nulli.us>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>
Cc:     netdev@...r.kernel.org, davem@...emloft.net, mlxsw@...lanox.com,
        idosch@...lanox.com, f.fainelli@...il.com, andrew@...n.ch,
        vivien.didelot@...il.com, michael.chan@...adcom.com
Subject: Re: [patch net-next 00/12] net: expose switch ID via devlink

Thu, Mar 28, 2019 at 10:40:02PM CET, jakub.kicinski@...ronome.com wrote:
>On Thu, 28 Mar 2019 22:12:42 +0100, Jiri Pirko wrote:
>> From: Jiri Pirko <jiri@...lanox.com>
>> 
>> To provide visibility of the ports, this patchset exposes switch ID
>> for devlink ports, which are part of a switch. The rest of the ports
>> if any (in case of sr-iov for example) do not set switch ID.
>
>I don't feel good about this patch set.  There is no visibility
>provided here.  Should the port flavour should be a sufficient

1) this patch is mainly about avoiding need to define the ndo and moving
   the switch id definition to devlink port attr.
2) along with that, switch id is added as attribute. It tells the user
   that some devlink port is part of a switch with certain id. If port
   is not part of a switch (like upcoming hostport, cpu, dsa, etc),
   switch id is not set on that port

>indication of whether netdev associated with that port can be 
>switched to or not?  CPU, DSA, and Host flavours can't be switched 
>to.  And the switchid can be an attribute of the devlink instance,
>if we want to expose it via devlink.

One devlink instance can have multiple switch ids in use as it may
contain multiple switches. Take mlx5 as an instance. Currently every PF
creates a separate devlink instance, however there are some features
shared. In this example, with proposed idea of aliasing, there would be
one devlink instance aliased between these 2 pf inctances, with 2
eswitches and 2 sets of switch ports each belonging to an eswitch -
distinguished by switch id.