Re: [PATCH net-next 3/3] net: ti: icssm-prueth: Support duplicate HW offload feature for HSR and PRP

[Parvathi Pudi <parvathi@couthit.com>]

Hi,

> On Thu, 11 Jun 2026 18:03:28 +0530 Parvathi Pudi wrote:
>> From: Roger Quadros <rogerq@ti.com>
>> 
>> In HSR and PRP modes each outgoing frame must be sent on both PRU slave
>> ports.
>> 
>> Previously the driver was writing the frame into each port's transmit queue
>> independently after updating the tags resulting in performing two OCMC
>> buffer copy operations.
>> 
>> Frame duplicate offloading is implemented with a common shared queue
>> between the two ports. The driver writes the frame once into OCMC RAM,
>> each port reads from the shared queue and replicates the transmission to
>> both PRU ports, synchronising between PRU ports are maintained within
>> firmware with appropriate handling.
>> 
>> For HSR the driver inspects the encapsulated ethertype in the HSR tag.
>> PTP frames (ETH_P_1588) are sent on the directed port only to avoid double
>> duplication and all other HSR frames are duplicated to both ports.
>> VLAN-tagged HSR frames are handled by advancing past the 4-byte VLAN header
>> before reading the HSR tag.
>> 
>> For PRP the driver checks the 6-byte RCT trailer for the ETH_P_PRP suffix
>> to identify redundancy-tagged frames. Frames without an RCT are sent on the
>> originating port only.
> 
> Warning: drivers/net/ethernet/ti/icssm/icssm_prueth.h:113 struct member
> 'host_recv_flag' not described in 'prueth_packet_info'
> 

We will address this in the next version.

> Please note that net-next will be closed for the next two weeks.

Also noted regarding the net-next closure. We will post the updated series
once the tree reopens.

Thanks and Regards,
Parvathi.