[patch net-next 0/9] Introduce devlink interface and first drivers to use it

Jiri Pirko
2016-02-22T18:32:08Z

From: Jiri Pirko <jiri@mellanox.com>

There a is need for some userspace API that would allow to expose things
that are not directly related to any device class like net_device of
ib_device, but rather chip-wide/switch-ASIC-wide stuff.

Use cases:
1) get/set of port type (Ethernet/InfiniBand)
2) setting up port splitters - split port into multiple ones and squash again,
enables usage of splitter cable
3) setting up shared buffers - shared among multiple ports within
one chip (work in progress)
4) configuration of switch wide properties - resources division etc - This will
allow to pass configuration that is unacceptable to be passed as
a module option.

First patch of this set introduces a new generic Netlink based interface,
called "devlink". It is similar to nl80211 model and it is heavily
influenced by it, including the API definition. The devlink introduction patch
implements use cases 1) and 2). Other 2 are in development atm and will
be addressed by follow-ups.

It is very convenient for drivers to use devlink, as you can see in other
patches in this set.

Counterpart for devlink is userspace tool for now called "dl". Command line
interface and outputs are derived from "ip" tool so it should be easy
for users to get used to it.

It is available here as a standalone tool for now:
https://github.com/jpirko/devlink
After this is merge in kernel, I will include the "dl" or "devlink" tool
into iproute2 toolset.

Port type setting example:
myhost:~$ dl help
Usage: dl [ OPTIONS ] OBJECT { COMMAND | help }
where OBJECT := { dev | port | monitor }
OPTIONS := { -v/--verbose }

myhost:~$ dl dev help
Usage: dl dev show [DEV]
Usage: dl dev set DEV [ name NEWNAME ]

myhost:~$ dl dev show
0: devlink0: bus pci dev 0000:01:00.0

myhost:~$ dl port help
Usage: dl port show [DEV/PORT_INDEX]
Usage: dl port set DEV/PORT_INDEX [ type { eth | ib | auto} ]
Usage: dl port split DEV/PORT_INDEX count
Usage: dl port unsplit DEV/PORT_INDEX

myhost:~$ dl port show
devlink0/1: type ib ibdev mlx4_0
devlink0/2: type ib ibdev mlx4_0

myhost:~$ sudo dl port set devlink0/1 type eth

myhost:~$ dl port show
devlink0/1: type eth netdev ens4
devlink0/2: type ib ibdev mlx4_0

myhost:~$ sudo dl port set devlink0/2 type auto

myhost:~$ dl port show
devlink0/1: type eth netdev ens4
devlink0/2: type ib(auto) ibdev mlx4_0

Port splitting example:
myswitch:~$ dl port
devlink0/1: type eth netdev eth0
devlink0/3: type eth netdev eth1
devlink0/5: type eth netdev eth2
...
devlink0/63: type eth netdev eth31

myswitch:~$ sudo dl port split devlink0/1 2

myswitch:~$ dl port
devlink0/3: type eth netdev eth1
devlink0/5: type eth netdev eth2
...
devlink0/63: type eth netdev eth31
devlink0/1: type eth netdev eth0 split_group 16
devlink0/2: type eth netdev eth32 split_group 16

myswitch:~$ sudo dl port unsplit devlink0/1

myswitch:~$ dl port
devlink0/3: type eth netdev eth1
devlink0/5: type eth netdev eth2
...
devlink0/63: type eth netdev eth31
devlink0/1: type eth netdev eth0

Ido Schimmel (4):
mlxsw: spectrum: Unmap local port from module during teardown
mlxsw: spectrum: Store local port to module mapping during init
mlxsw: spectrum: Mark unused ports using NULL
mlxsw: spectrum: Introduce port splitting

Jiri Pirko (5):
Introduce devlink infrastructure
mlx4: Implement devlink interface
mlx4: Implement port type setting via devlink interface
mlxsw: Implement devlink interface
mlxsw: core: Add devlink port splitter callbacks

MAINTAINERS | 8 +
drivers/infiniband/hw/mlx4/main.c | 7 +
drivers/net/ethernet/mellanox/mlx4/en_netdev.c | 8 +-
drivers/net/ethernet/mellanox/mlx4/intf.c | 9 +
drivers/net/ethernet/mellanox/mlx4/main.c | 129 +++-
drivers/net/ethernet/mellanox/mlx4/mlx4.h | 2 +
drivers/net/ethernet/mellanox/mlxsw/core.c | 56 +-
drivers/net/ethernet/mellanox/mlxsw/core.h | 2 +
drivers/net/ethernet/mellanox/mlxsw/port.h | 2 +
drivers/net/ethernet/mellanox/mlxsw/spectrum.c | 238 ++++++-
drivers/net/ethernet/mellanox/mlxsw/spectrum.h | 8 +-
drivers/net/ethernet/mellanox/mlxsw/switchx2.c | 20 +
include/linux/mlx4/driver.h | 3 +
include/net/devlink.h | 156 +++++
include/uapi/linux/devlink.h | 73 ++
net/Kconfig | 7 +
net/core/Makefile | 1 +
net/core/devlink.c | 887 +++++++++++++++++++++++++
18 files changed, 1557 insertions(+), 59 deletions(-)
create mode 100644 include/net/devlink.h
create mode 100644 include/uapi/linux/devlink.h
create mode 100644 net/core/devlink.c

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2.5.0