netdev - Re: [patch net-next RFC 00/10] introduce line card support for modular switch

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Date:   Wed, 20 Jan 2021 09:36:05 +0100
From:   Jiri Pirko <jiri@...nulli.us>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     netdev@...r.kernel.org, davem@...emloft.net, kuba@...nel.org,
        jacob.e.keller@...el.com, roopa@...dia.com, mlxsw@...dia.com
Subject: Re: [patch net-next RFC 00/10] introduce line card support for
 modular switch

Tue, Jan 19, 2021 at 03:51:49PM CET, andrew@...n.ch wrote:
>On Tue, Jan 19, 2021 at 12:56:10PM +0100, Jiri Pirko wrote:
>> Thu, Jan 14, 2021 at 03:07:18AM CET, andrew@...n.ch wrote:
>> >> $ devlink lc provision netdevsim/netdevsim10 lc 0 type card4ports
>> >> $ devlink lc
>> >> netdevsim/netdevsim10:
>> >>   lc 0 state provisioned type card4ports
>> >>     supported_types:
>> >>        card1port card2ports card4ports
>> >>   lc 1 state unprovisioned
>> >>     supported_types:
>> >>        card1port card2ports card4ports
>> >
>> >Hi Jiri
>> >
>> >> # Now activate the line card using debugfs. That emulates plug-in event
>> >> # on real hardware:
>> >> $ echo "Y"> /sys/kernel/debug/netdevsim/netdevsim10/linecards/0/active
>> >> $ ip link show eni10nl0p1
>> >> 165: eni10nl0p1: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT group default qlen 1000
>> >>     link/ether 7e:2d:05:93:d3:d1 brd ff:ff:ff:ff:ff:ff
>> >> # The carrier is UP now.
>> >
>> >What is missing from the devlink lc view is what line card is actually
>> >in the slot. Say if i provision for a card4port, but actually insert a
>> >card2port. It would be nice to have something like:
>> 
>> I checked, our hw does not support that. Only provides info that
>> linecard activation was/wasn't successful.
>
>Hi Jiri
>
>Is this a firmware limitation? There is no API to extract the
>information from the firmware to the host? The firmware itself knows
>there is a mismatch and refuses to configure the line card, and
>prevents the MAC going up?

No, the FW does not know. The ASIC is not physically able to get the
linecard type. Yes, it is odd, I agree. The linecard type is known to
the driver which operates on i2c. This driver takes care of power
management of the linecard, among other tasks.


>
>Even if you cannot do this now, it seems likely in future firmware
>versions you will be able to, so maybe at least define the netlink

Sure, for netdevsim that is not problem. Our current hw does not support
it, the future may.


>attributes now? As well as attributes indicating activation was
>successful.

State "ACTIVATED" is that indication. It is in this RFC.


>
>	Andrew