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fix(HSR_Offload): changed introduction.rst #281

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30 changes: 21 additions & 9 deletions source/linux/Foundational_Components/Kernel/Kernel_Drivers/Network/HSR_Offload.rst
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Expand Up @@ -4,15 +4,27 @@ HSR Offload

.. rubric:: **Introduction**

HSR framework in linux allows offloading below functionalities to the
device
hsr-fwd-offload: For forwarding HSR frames one port to another i.e port-to-port
forwarding

hsr-dup-offload: Duplicate the outgoing HSR frame

The ICSSG HSR firmware supports port-to-port forwarding, Tx packet duplication
and this allows to offload these capabilities from HSR driver in software to the PRU-ICSSG.
Redundant and reliable communication is necessary for the highly critical nature of grid infrastructure where network
failures can lead to a disruption in electricity distribution. The international standard IEC 61850 addresses this importance and
defines communication protocols that provide this redundancy and reliability needed within these grid substations. High-availability Seamless Redundancy (HSR)
and Parallel Redundancy Protocol (PRP) are communication protocols defined by this standard, and they are the preferred protocols in today’s
industry because there is no downtime or packet loss when a link failure occurs. In terms of current offload support, HSR will be the main focus.
As mentioned in the HSR PRP Non-offload Section of these release notes, HSR is a protocol that supports redundant network connections, usually configured
as a ring with Ethernet frames being sent in both directions. If one path around the ring fails, the other duplicated packet will still reach the intended destination.

When implementing HSR solutions in grid substations, traditionally, FPGAs and ASICs were used to support the HSR standard, but with modern
processors and hardware accelerators, the AM64x provides a more cost-effective solution for implementing substation requirements, including HSR.
Offloading is the process of transferring tasks away from the CPU to another processing unit. In the case of the AM64x Sitara Processor,
HSR tasks can be offloaded from the A53 cores to the PRU_ICSSG.

.. rubric:: **Linux HSR Offload Support**
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Please add a newline after a directive.

HSR framework in Linux allows offloading below functionalities to the device:
• hsr-fwd-offload: For forwarding HSR frames one port to another i.e. port-to-port forwarding
• hsr-dup-offload: Duplicate the outgoing HSR frame
• hsr-tag-ins-offload: Unique tag to identify HSR frames
• hsr-tag-rm-offload: Removes the HSR tags
Comment on lines +22 to +25
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Suggested change
• hsr-fwd-offload: For forwarding HSR frames one port to another i.e. port-to-port forwarding
• hsr-dup-offload: Duplicate the outgoing HSR frame
• hsr-tag-ins-offload: Unique tag to identify HSR frames
• hsr-tag-rm-offload: Removes the HSR tags
- hsr-fwd-offload: For forwarding HSR frames one port to another i.e. port-to-port forwarding
- hsr-dup-offload: Duplicate the outgoing HSR frame
- hsr-tag-ins-offload: Unique tag to identify HSR frames
- hsr-tag-rm-offload: Removes the HSR tags


The ICSSG HSR firmware supports these features which offloads these capabilities from the HSR driver in software to the PRU-ICSSG. Cut-through switching improves HSR latency but would need to be implemented separately.

To enable offloading using below commands
To enable port-to-port offload
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