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

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Date:   Tue, 19 Jan 2021 09:23:19 -0700
From:   David Ahern <dsahern@...il.com>
To:     Jiri Pirko <jiri@...nulli.us>, 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

On 1/19/21 4:56 AM, 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.
> 

There is no way for the supervisor / management card to probe and see
what card is actually inserted in a given slot? That seems like a
serious design deficiency. What about some agent running on the line
card talking to an agent on the supervisor to provide that information?