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

[Jakub Kicinski]

On Thu, 11 Jun 2026 18:03:28 +0530 Parvathi Pudi wrote:
> From: Roger Quadros <rogerq at 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'

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