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

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Date:   Thu, 14 Jan 2021 03:07:18 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Jiri Pirko <jiri@...nulli.us>
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

> $ 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:

 $ devlink lc
 netdevsim/netdevsim10:
   lc 0 state provisioned type card4ports
     supported_types:
        card1port card2ports card4ports
     inserted_type:
        card2ports;
   lc 1 state unprovisioned
     supported_types:
        card1port card2ports card4ports
     inserted_type:
        None

I assume if i prevision for card4ports but actually install a
card2ports, all the interfaces stay down?

Maybe

> $ echo "Y"> /sys/kernel/debug/netdevsim/netdevsim10/linecards/0/active

should actually be
    echo "card2ports" > /sys/kernel/debug/netdevsim/netdevsim10/linecards/0/active

so you can emulate somebody putting the wrong card in the slot?

    Andrew