From fcdc8ce23a309c26a67fc613a741d9b21a248311 Mon Sep 17 00:00:00 2001 From: Jiri Pirko Date: Mon, 18 Apr 2022 09:42:26 +0300 Subject: devlink: implement line card provisioning In order to be able to configure all needed stuff on a port/netdevice of a line card without the line card being present, introduce line card provisioning. Basically by setting a type, provisioning process will start and driver is supposed to create a placeholder for instances (ports/netdevices) for a line card type. Allow the user to query the supported line card types over line card get command. Then implement two netlink command SET to allow user to set/unset the card type. On the driver API side, add provision/unprovision ops and supported types array to be advertised. Upon provision op call, the driver should take care of creating the instances for the particular line card type. Introduce provision_set/clear() functions to be called by the driver once the provisioning/unprovisioning is done on its side. These helpers are not to be called directly due to the async nature of provisioning. 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 $ 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 $ devlink lc set pci/0000:01:00.0 lc 8 notype Signed-off-by: Jiri Pirko Signed-off-by: Ido Schimmel Signed-off-by: David S. Miller --- .../networking/devlink/devlink-linecard.rst | 121 +++++++++++++++++++++ Documentation/networking/devlink/index.rst | 1 + 2 files changed, 122 insertions(+) create mode 100644 Documentation/networking/devlink/devlink-linecard.rst (limited to 'Documentation/networking') diff --git a/Documentation/networking/devlink/devlink-linecard.rst b/Documentation/networking/devlink/devlink-linecard.rst new file mode 100644 index 000000000000..63ccd17f40ac --- /dev/null +++ b/Documentation/networking/devlink/devlink-linecard.rst @@ -0,0 +1,121 @@ +.. SPDX-License-Identifier: GPL-2.0 + +================= +Devlink Line card +================= + +Background +========== + +The ``devlink-linecard`` mechanism is targeted for manipulation of +line cards that serve as a detachable PHY modules for modular switch +system. Following operations are provided: + + * Get a list of supported line card types. + * Provision of a slot with specific line card type. + * Get and monitor of line card state and its change. + +Line card according to the type may contain one or more gearboxes +to mux the lanes with certain speed to multiple ports with lanes +of different speed. Line card ensures N:M mapping between +the switch ASIC modules and physical front panel ports. + +Overview +======== + +Each line card devlink object is created by device driver, +according to the physical line card slots available on the device. + +Similar to splitter cable, where the device might have no way +of detection of the splitter cable geometry, the device +might not have a way to detect line card type. For that devices, +concept of provisioning is introduced. It allows the user to: + + * Provision a line card slot with certain line card type + + - Device driver would instruct the ASIC to prepare all + resources accordingly. The device driver would + create all instances, namely devlink port and netdevices + that reside on the line card, according to the line card type + * Manipulate of line card entities even without line card + being physically connected or powered-up + * Setup splitter cable on line card ports + + - As on the ordinary ports, user may provision a splitter + cable of a certain type, without the need to + be physically connected to the port + * Configure devlink ports and netdevices + +Netdevice carrier is decided as follows: + + * Line card is not inserted or powered-down + + - The carrier is always down + * Line card is inserted and powered up + + - The carrier is decided as for ordinary port netdevice + +Line card state +=============== + +The ``devlink-linecard`` mechanism supports the following line card states: + + * ``unprovisioned``: Line card is not provisioned on the slot. + * ``unprovisioning``: Line card slot is currently being unprovisioned. + * ``provisioning``: Line card slot is currently in a process of being provisioned + with a line card type. + * ``provisioning_failed``: Provisioning was not successful. + * ``provisioned``: Line card slot is provisioned with a type. + +The following diagram provides a general overview of ``devlink-linecard`` +state transitions:: + + +-------------------------+ + | | + +----------------------------------> unprovisioned | + | | | + | +--------|-------^--------+ + | | | + | | | + | +--------v-------|--------+ + | | | + | | provisioning | + | | | + | +------------|------------+ + | | + | +-----------------------------+ + | | | + | +------------v------------+ +------------v------------+ + | | | | | + +----- provisioning_failed | | provisioned | + | | | | | + | +------------^------------+ +------------|------------+ + | | | + | | | + | | +------------v------------+ + | | | | + | | | unprovisioning | + | | | | + | | +------------|------------+ + | | | + | +-----------------------------+ + | | + +-----------------------------------------------+ + + +Example usage +============= + +.. code:: shell + + $ devlink lc show [ DEV [ lc LC_INDEX ] ] + $ devlink lc set DEV lc LC_INDEX [ { type LC_TYPE | notype } ] + + # Show current line card configuration and status for all slots: + $ devlink lc + + # Set slot 8 to be provisioned with type "16x100G": + $ devlink lc set pci/0000:01:00.0 lc 8 type 16x100G + + # Set slot 8 to be unprovisioned: + $ devlink lc set pci/0000:01:00.0 lc 8 notype diff --git a/Documentation/networking/devlink/index.rst b/Documentation/networking/devlink/index.rst index c17cdb079611..850715512293 100644 --- a/Documentation/networking/devlink/index.rst +++ b/Documentation/networking/devlink/index.rst @@ -39,6 +39,7 @@ general. devlink-resource devlink-reload devlink-trap + devlink-linecard Driver-specific documentation ----------------------------- -- cgit v1.2.3