linux-kernel - [PATCH net-next 0/3] RSTP SWITCH support for PRU-ICSSM Ethernet driver

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Message-ID: <20250925141246.3433603-1-parvathi@couthit.com>
Date: Thu, 25 Sep 2025 19:32:09 +0530
From: Parvathi Pudi <parvathi@...thit.com>
To: andrew+netdev@...n.ch,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	danishanwar@...com,
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Cc: linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org,
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Subject: [PATCH net-next 0/3] RSTP SWITCH support for PRU-ICSSM Ethernet driver

Hi,

The DUAL-EMAC patch series for Megabit Industrial Communication Sub-system
(ICSSM), which provides the foundational support for Ethernet functionality
over PRU-ICSS on the TI SOCs (AM335x, AM437x, and AM57x), was merged into
net-next recently [1].

This patch series enhances the PRU-ICSSM Ethernet driver to support
RSTP SWITCH mode, which has been implemented based on "switchdev" and
interacts with "mstp daemon" to support Rapid Spanning Tree Protocol
(RSTP) as well.

Once the RSTP SWITCH mode is enabled, forwarding of Ethernet packets using
either the traditional store-and-forward mechanism or via cut-through is
offloaded to the two PRU based Ethernet interfaces available within the
ICSSM. The firmware running on the PRU inspects the STP port states and
performs multiple checks before forwarding a packet. This improves the
overall system performance and significantly reduces the packet forwarding
latency.

Protocol switching from dual EMAC to RSTP SWITCH mode can be done as follows.

Assuming eth2 and eth3 are the two physical ports of the ICSS2 instance:

>> brctl addbr br0
>> ip maddr add 01:80:c2:00:00:00 dev br0
>> ip link set dev br0 address $(cat /sys/class/net/eth2/address)
>> brctl addif br0 eth2
>> brctl addif br0 eth3
>> mstpd
>> brctl stp br0 on
>> mstpctl setforcevers br0 rstp
>> ip link set dev br0 up

To revert back to the default dual EMAC mode, the steps are as follows:

>> ip link set dev br0 down
>> brctl delif br0 eth2
>> brctl delif br0 eth3
>> brctl delbr br0

The patches presented in this series have gone through the patch verification
tools and no warnings or errors are reported.

Sample test logs obtained from AM33x, AM43x and AM57x verifying the
functionality on Linux next kernel are available here:

[Interface up Testing](https://gist.github.com/ParvathiPudi/ee90d6f7778f01660eec714d128ee224)

[Ping Testing](https://gist.github.com/ParvathiPudi/ea7fc58da454b9c1d15517f84a502ae2)

[Iperf Testing](https://gist.github.com/ParvathiPudi/505d8c6e9de231098215c59b66dee20b)

[1] https://lore.kernel.org/all/20250912104741.528721-1-parvathi@couthit.com/

Thanks and Regards,
Parvathi.

Roger Quadros (3):
  net: ti: icssm-prueth: Adds helper functions to configure and maintain
    FDB
  net: ti: icssm-prueth: Adds switchdev support for icssm_prueth driver
  net: ti: icssm-prueth: Adds support for ICSSM RSTP switch

 drivers/net/ethernet/ti/Makefile              |   2 +-
 drivers/net/ethernet/ti/icssm/icssm_prueth.c  | 554 +++++++++-
 drivers/net/ethernet/ti/icssm/icssm_prueth.h  |  27 +-
 .../ethernet/ti/icssm/icssm_prueth_fdb_tbl.h  |  66 ++
 .../ethernet/ti/icssm/icssm_prueth_switch.c   | 999 ++++++++++++++++++
 .../ethernet/ti/icssm/icssm_prueth_switch.h   |  37 +
 drivers/net/ethernet/ti/icssm/icssm_switch.h  |  82 ++
 .../net/ethernet/ti/icssm/icssm_switchdev.c   | 332 ++++++
 .../net/ethernet/ti/icssm/icssm_switchdev.h   |  13 +
 .../ti/icssm/icssm_vlan_mcast_filter_mmap.h   | 120 +++
 10 files changed, 2209 insertions(+), 23 deletions(-)
 create mode 100644 drivers/net/ethernet/ti/icssm/icssm_prueth_fdb_tbl.h
 create mode 100644 drivers/net/ethernet/ti/icssm/icssm_prueth_switch.c
 create mode 100644 drivers/net/ethernet/ti/icssm/icssm_prueth_switch.h
 create mode 100644 drivers/net/ethernet/ti/icssm/icssm_switchdev.c
 create mode 100644 drivers/net/ethernet/ti/icssm/icssm_switchdev.h
 create mode 100644 drivers/net/ethernet/ti/icssm/icssm_vlan_mcast_filter_mmap.h

-- 
2.43.0