[RFC 0/9] staging: dpaa2-switch: add support for CPU terminated traffic

Ioana Ciornei
2020-11-04T16:58:39Z

This patch set adds support for Rx/Tx capabilities on DPAA2 switch port
interfaces as well as fixing up so major blunders in how we take care of
the switching domains. The netdev community considers this as a basic
features, thus it's sent against the staging tree before anything can be
moved out of it.

The control interface is comprised of 3 queues in total: Rx, Rx error
and Tx confirmation. In this patch set we only enable Rx and Tx conf.
All switch ports share the same queues when frames are redirected to the
CPU. Information regarding the ingress switch port is passed through
frame metadata - the flow context field of the descriptor.

NAPI instances are also shared between switch net_devices and are
enabled when at least on one of the switch ports .dev_open() was called
and disabled when no switch port is still up.

Since the last version of this feature was submitted to the list, I
reworked how the switching and flooding domains are taken care of by the
driver, thus the switch is now able to also add the control port (the
queues that the CPU can dequeue from) into the flooding domains of a
port (broadcast, unknown unicast etc). With this, we are able to receive
and sent traffic from the switch interfaces.

Also, the capability to properly partition the DPSW object into multiple
switching domains was added so that when not under a bridge, the ports
are not actually capable to switch between them. This is possible by
adding a private FDB table per switch interface. When multiple switch
interfaces are under the same bridge, they will all use the same FDB
table.

Another thing that is fixed in this patch set is how the driver handles
VLAN awareness. The DPAA2 switch is not capable to run as VLAN unaware
but this was not reflected in how the driver responded to requests to
change the VLAN awareness. In the last patch, this is fixed by
describing the switch interfaces as Rx VLAN filtering on [fixed] and
declining any request to join a VLAN unaware bridge.

I am sending this as a RFC since I would like to receive feedback on the
current capabilities of the switch driver and if they meet or not meet
the expectations, all this before I actually settle on a firmware
interface.

Ioana Ciornei (9):
staging: dpaa2-switch: get control interface attributes
staging: dpaa2-switch: setup buffer pool for control traffic
staging: dpaa2-switch: setup RX path rings
staging: dpaa2-switch: setup dpio
staging: dpaa2-switch: handle Rx path on control interface
staging: dpaa2-switch: add .ndo_start_xmit() callback
staging: dpaa2-switch: enable the control interface
staging: dpaa2-switch: properly setup switching domains
staging: dpaa2-switch: accept only vlan-aware upper devices

drivers/staging/fsl-dpaa2/Kconfig | 1 +
drivers/staging/fsl-dpaa2/ethsw/dpsw-cmd.h | 89 +-
drivers/staging/fsl-dpaa2/ethsw/dpsw.c | 269 +++++
drivers/staging/fsl-dpaa2/ethsw/dpsw.h | 144 +++
drivers/staging/fsl-dpaa2/ethsw/ethsw.c | 1131 ++++++++++++++++++--
drivers/staging/fsl-dpaa2/ethsw/ethsw.h | 75 +-
6 files changed, 1641 insertions(+), 68 deletions(-)

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2.28.0