netdev - Re: [PATCH net-next 00/17] Introduce line card support for modular switch

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Message-ID: <4d86acf1-d449-92d7-f8c7-bd0edc9e5107@gmail.com>
Date:   Mon, 18 Apr 2022 08:31:30 -0600
From:   David Ahern <dsahern@...il.com>
To:     Ido Schimmel <idosch@...dia.com>, netdev@...r.kernel.org
Cc:     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

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/