switchdev - no more sdk

Elad Raz, Jiri Pirko

Kernel TLV | 2016

Switchdev – No More SDK

© 2016 Mellanox Technologies 2

Switchdev is here to stay

What?

Why?

Where?



What?

Why?

Where?



What?

64 net-devicesDoing skb rx/tx, ethtool, port state and ndo offload



What?

switchdev_ops.1D/.1Q Bridging – VLANs, PVID, FDB, IGMP…

Routing – FIB offload

and more



What?

In-kernel implementation

NO MORE SDK!drivers/net/ethernet/mellanox/mlxsw



Devlinkset port type, port splitter, shared buffers, etc.

What?



QoS, Shared bufferDCBNL interface implementation

What?



L3 offloadfix the current switchdev model, include VRF support

What?



What?

Why?

Where?

pen



Why?

Community based

Open-source

Standard behavior

Standard API



What?

Why?

Where?



Where?

Flowstc cls_flower + selected acts offload



Where?

(e)BPF?


SWITCHDEV

commit 007f790c8276271de26416f90d55561bcc96588a

Author: Jiri Pirko <[email protected]>

Date: Fri Nov 28 14:34:17 2014 +0100

net: introduce generic switch devices support

The goal of this is to provide a possibility to support various switch

chips. Drivers should implement relevant ndos to do so. Now there is

only one ndo defined:

- for getting physical switch id is in place.

Note that user can use random port netdevice to access the switch.

Signed-off-by: Jiri Pirko <[email protected]>

Reviewed-by: Thomas Graf <[email protected]>

Acked-by: Andy Gospodarek <[email protected]>

Signed-off-by: David S. Miller <[email protected]>


ROCKER

commit 4b8ac9660af07be6f6602b523929793eed314997


Date: Fri Nov 28 14:34:26 2014 +0100

rocker: introduce rocker switch driver

This patch introduces the first driver to benefit from the switchdev

infrastructure and to implement newly introduced switch ndos. This is a

driver for emulated switch chip implemented in qemu:

https://github.com/sfeldma/qemu-rocker/

This patch is a result of joint work with Scott Feldman.

Signed-off-by: Scott Feldman <[email protected]>


Reviewed-by: Thomas Graf <[email protected]>

Reviewed-by: John Fastabend <[email protected]>



MLXSW

commit 93c1edb27f9e7ef7f276b91763c93242bbda71cb


Date: Wed Jul 29 23:33:46 2015 +0200

mlxsw: Introduce Mellanox switch driver core

Add core components of Mellanox switch driver infrastructure.

Core infrastructure is designed so that it can be used by multiple

bus drivers (PCI now, I2C and SGMII are planned to be implemented

in the future). Multiple switch kind drivers can be registered as well.

This core serves as a glue between buses and drivers.


Signed-off-by: Ido Schimmel <[email protected]>

Signed-off-by: Elad Raz <[email protected]>

Reviewed-by: Scott Feldman <[email protected]>



ndo_ops

static const struct net_device_ops mlxsw_sp_port_netdev_ops = {

.ndo_open = mlxsw_sp_port_open,

.ndo_stop = mlxsw_sp_port_stop,

.ndo_start_xmit = mlxsw_sp_port_xmit,

.ndo_set_rx_mode = mlxsw_sp_set_rx_mode,

.ndo_set_mac_address = mlxsw_sp_port_set_mac_address,

.ndo_change_mtu = mlxsw_sp_port_change_mtu,

.ndo_get_stats64 = mlxsw_sp_port_get_stats64,

.ndo_vlan_rx_add_vid = mlxsw_sp_port_add_vid,

.ndo_vlan_rx_kill_vid = mlxsw_sp_port_kill_vid,

.ndo_fdb_add = switchdev_port_fdb_add,

.ndo_fdb_del = switchdev_port_fdb_del,

.ndo_fdb_dump = switchdev_port_fdb_dump,

.ndo_bridge_setlink = switchdev_port_bridge_setlink,

.ndo_bridge_getlink = switchdev_port_bridge_getlink,

.ndo_bridge_dellink = switchdev_port_bridge_dellink,

};


switchdev_ops

static const struct switchdev_ops mlxsw_sp_port_switchdev_ops = {

.switchdev_port_attr_get = mlxsw_sp_port_attr_get,

.switchdev_port_attr_set = mlxsw_sp_port_attr_set,

.switchdev_port_obj_add = mlxsw_sp_port_obj_add,

.switchdev_port_obj_del = mlxsw_sp_port_obj_del,

.switchdev_port_obj_dump = mlxsw_sp_port_obj_dump,

};


switchdev_attr

enum switchdev_attr_id {

SWITCHDEV_ATTR_ID_UNDEFINED,

SWITCHDEV_ATTR_ID_PORT_PARENT_ID,

SWITCHDEV_ATTR_ID_PORT_STP_STATE,

SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS,

SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME,

SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING,

};

struct switchdev_attr {

struct net_device *orig_dev;

enum switchdev_attr_id id;

u32 flags;

void *complete_priv;

void (*complete)(struct net_device *dev, int err, void *priv);

union {

struct netdev_phys_item_id ppid; /* PORT_PARENT_ID */

u8 stp_state; /* PORT_STP_STATE */

unsigned long brport_flags; /* PORT_BRIDGE_FLAGS */

u32 ageing_time; /* BRIDGE_AGEING_TIME */

bool vlan_filtering; /* BRIDGE_VLAN_FILTERING */

} u;

};


switchdev_obj

enum switchdev_obj_id {

SWITCHDEV_OBJ_ID_UNDEFINED,

SWITCHDEV_OBJ_ID_PORT_VLAN,

SWITCHDEV_OBJ_ID_IPV4_FIB,

SWITCHDEV_OBJ_ID_PORT_FDB,

SWITCHDEV_OBJ_ID_PORT_MDB,

};

struct switchdev_obj {

struct net_device *orig_dev;

enum switchdev_obj_id id;

u32 flags;

void *complete_priv;

void (*complete)(struct net_device *dev, int err, void *priv);

};

/* SWITCHDEV_OBJ_ID_PORT_FDB */

struct switchdev_obj_port_fdb {

struct switchdev_obj obj;

unsigned char addr[ETH_ALEN];

u16 vid;

u16 ndm_state;

};


call_switchdev_notifiers

info.addr = mac;

info.vid = vid;

notifier_type = adding ? SWITCHDEV_FDB_ADD : SWITCHDEV_FDB_DEL;

call_switchdev_notifiers(notifier_type, dev, &info.info);


NETDEV_CHANGEUPPER

register_netdevice_notifier informs using

NETDEV_(PRE)CHANGEUPPER about:

• VLANs

• Bridges

• LAGs (Team/bond)

Thank You

switchdev - no more sdk

Software