Date:   Tue, 19 Apr 2022 13:55:44 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     David Ahern <dsahern@...il.com>
Cc:     Ido Schimmel <idosch@...dia.com>, netdev@...r.kernel.org,
        davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
        jiri@...dia.com, vadimp@...dia.com, petrm@...dia.com,
        andrew@...n.ch, mlxsw@...dia.com
Subject: Re: [PATCH net-next 00/17] Introduce line card support for modular
 switch

Mon, Apr 18, 2022 at 04:31:30PM CEST, dsahern@...il.com wrote:
>On 4/18/22 12:42 AM, Ido Schimmel wrote:
>> Jiri says:
>> 
>> This patchset introduces support for modular switch systems and also
>> introduces mlxsw support for NVIDIA Mellanox SN4800 modular switch.
>> It contains 8 slots to accommodate line cards - replaceable PHY modules
>> which may contain gearboxes.
>> Currently supported line card:
>> 16X 100GbE (QSFP28)
>> Other line cards that are going to be supported:
>> 8X 200GbE (QSFP56)
>> 4X 400GbE (QSFP-DD)
>> There may be other types of line cards added in the future.
>> 
>> To be consistent with the port split configuration (splitter cabels),
>> the line card entities are treated in the similar way. The nature of
>> a line card is not "a pluggable device", but "a pluggable PHY module".
>> 
>> A concept of "provisioning" is introduced. The user may "provision"
>> certain slot with a line card type. Driver then creates all instances
>> (devlink ports, netdevices, etc) related to this line card type. It does
>> not matter if the line card is plugged-in at the time. User is able to
>> configure netdevices, devlink ports, setup port splitters, etc. From the
>> perspective of the switch ASIC, all is present and can be configured.
>> 
>> The carrier of netdevices stays down if the line card is not plugged-in.
>> Once the line card is inserted and activated, the carrier of
>> the related netdevices is then reflecting the physical line state,
>> same as for an ordinary fixed port.
>> 
>> Once user does not want to use the line card related instances
>> anymore, he can "unprovision" the slot. Driver then removes the
>> instances.
>> 
>> Patches 1-4 are extending devlink driver API and UAPI in order to
>> register, show, dump, provision and activate the line card.
>> Patches 5-17 are implementing the introduced API in mlxsw.
>> The last patch adds a selftest for mlxsw line cards.
>> 
>> Example:
>> $ devlink port # No ports are listed
>> $ devlink lc
>> pci/0000:01:00.0:
>>   lc 1 state unprovisioned
>>     supported_types:
>>        16x100G
>>   lc 2 state unprovisioned
>>     supported_types:
>>        16x100G
>>   lc 3 state unprovisioned
>>     supported_types:
>>        16x100G
>>   lc 4 state unprovisioned
>>     supported_types:
>>        16x100G
>>   lc 5 state unprovisioned
>>     supported_types:
>>        16x100G
>>   lc 6 state unprovisioned
>>     supported_types:
>>        16x100G
>>   lc 7 state unprovisioned
>>     supported_types:
>>        16x100G
>>   lc 8 state unprovisioned
>>     supported_types:
>>        16x100G
>> 
>> Note that driver exposes list supported line card types. Currently
>> there is only one: "16x100G".
>> 
>> To provision the slot #8:
>> 
>> $ devlink lc set pci/0000:01:00.0 lc 8 type 16x100G
>> $ devlink lc show pci/0000:01:00.0 lc 8
>> pci/0000:01:00.0:
>>   lc 8 state active type 16x100G
>>     supported_types:
>>        16x100G
>> $ devlink port
>> pci/0000:01:00.0/0: type notset flavour cpu port 0 splittable false
>> pci/0000:01:00.0/53: type eth netdev enp1s0nl8p1 flavour physical lc 8 port 1 splittable true lanes 4
>> pci/0000:01:00.0/54: type eth netdev enp1s0nl8p2 flavour physical lc 8 port 2 splittable true lanes 4
>> pci/0000:01:00.0/55: type eth netdev enp1s0nl8p3 flavour physical lc 8 port 3 splittable true lanes 4
>> pci/0000:01:00.0/56: type eth netdev enp1s0nl8p4 flavour physical lc 8 port 4 splittable true lanes 4
>> pci/0000:01:00.0/57: type eth netdev enp1s0nl8p5 flavour physical lc 8 port 5 splittable true lanes 4
>> pci/0000:01:00.0/58: type eth netdev enp1s0nl8p6 flavour physical lc 8 port 6 splittable true lanes 4
>> pci/0000:01:00.0/59: type eth netdev enp1s0nl8p7 flavour physical lc 8 port 7 splittable true lanes 4
>> pci/0000:01:00.0/60: type eth netdev enp1s0nl8p8 flavour physical lc 8 port 8 splittable true lanes 4
>> pci/0000:01:00.0/61: type eth netdev enp1s0nl8p9 flavour physical lc 8 port 9 splittable true lanes 4
>> pci/0000:01:00.0/62: type eth netdev enp1s0nl8p10 flavour physical lc 8 port 10 splittable true lanes 4
>> pci/0000:01:00.0/63: type eth netdev enp1s0nl8p11 flavour physical lc 8 port 11 splittable true lanes 4
>> pci/0000:01:00.0/64: type eth netdev enp1s0nl8p12 flavour physical lc 8 port 12 splittable true lanes 4
>> pci/0000:01:00.0/125: type eth netdev enp1s0nl8p13 flavour physical lc 8 port 13 splittable true lanes 4
>> pci/0000:01:00.0/126: type eth netdev enp1s0nl8p14 flavour physical lc 8 port 14 splittable true lanes 4
>> pci/0000:01:00.0/127: type eth netdev enp1s0nl8p15 flavour physical lc 8 port 15 splittable true lanes 4
>> pci/0000:01:00.0/128: type eth netdev enp1s0nl8p16 flavour physical lc 8 port 16 splittable true lanes 4
>> 
>> To uprovision the slot #8:
>> 
>> $ devlink lc set pci/0000:01:00.0 lc 8 notype
>> 
>
>are there any changes from the last RFC?
>
>https://lore.kernel.org/netdev/20210122094648.1631078-1-jiri@resnulli.us/

Yes, many of them, I din't track them. Mainly, the RFC was backed by
netdevsim implementation, this is mlxsw with actual HW underneath.

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