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net: hsr: add offloading support

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Add support for offloading of HSR/PRP (IEC 62439-3) tag insertion
tag removal, duplicate generation and forwarding.

For HSR, insertion involves the switch adding a 6 byte HSR header after
the 14 byte Ethernet header. For PRP it adds a 6 byte trailer.

Tag removal involves automatically stripping the HSR/PRP header/trailer
in the switch. This is possible when the switch also performs auto
deduplication using the HSR/PRP header/trailer (making it no longer
required).

Forwarding involves automatically forwarding between redundant ports in
an HSR. This is crucial because delay is accumulated as a frame passes
through each node in the ring.

Duplication involves the switch automatically sending a single frame
from the CPU port to both redundant ports. This is required because the
inserted HSR/PRP header/trailer must contain the same sequence number
on the frames sent out both redundant ports.

Export is_hsr_master so DSA can tell them apart from other devices in
dsa_slave_changeupper.

Signed-off-by: George McCollister <george.mccollister@gmail.com>
Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
George McCollister authored and David S. Miller committed 2021-02-11 13:24:44 -08:00
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commit dcf0cd1cc5
12 files changed
+109 -26
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Documentation/networking/netdev-features.rst
+21
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@@ -182,3 +182,24 @@ stricter than Hardware LRO. A packet stream merged by Hardware GRO must
be re-segmentable by GSO or TSO back to the exact original packet stream.
Hardware GRO is dependent on RXCSUM since every packet successfully merged
by hardware must also have the checksum verified by hardware.
* hsr-tag-ins-offload
This should be set for devices which insert an HSR (High-availability Seamless
Redundancy) or PRP (Parallel Redundancy Protocol) tag automatically.
* hsr-tag-rm-offload
This should be set for devices which remove HSR (High-availability Seamless
Redundancy) or PRP (Parallel Redundancy Protocol) tags automatically.
* hsr-fwd-offload
This should be set for devices which forward HSR (High-availability Seamless
Redundancy) frames from one port to another in hardware.
* hsr-dup-offload
This should be set for devices which duplicate outgoing HSR (High-availability
Seamless Redundancy) or PRP (Parallel Redundancy Protocol) tags automatically
frames in hardware.