Rcar 5.1.6.rc3 l3 hw offload #3
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Signed-off-by: Leonid Komarianskyi <leonid_komarianskyi@epam.com>
L3 offload requires implementing FIB notifier for switch device, which is responsible for handling FIB events and rule changes. The notifier callback is invoked when interface initializes, or some new IP route adds. In this case, the notifier should handle add/delete route and make appropriate configuration on HW side. The L3 HW offload on S4 R-Switch is implemented using MFWD L3 routing, perfect filters, and L23 update table. When the IP routing callback is invoked, it adds a new route via Perfect filters to the existing interface and caches information about which packets can be routed using this interface. When packets go from R-Switch to outside they firstly come to rx_learning_chain, where they will be analyzed, and if match with cached before routing rules, the appropriate L3 rule will be added via L3 IPv4/v6 hash extract. After that, packets that match this stream ID will be forwarded to the appropriate destination port with updating destination MAC and TTL via L23 Update logic. Signed-off-by: Leonid Komarianskyi <leonid_komarianskyi@epam.com>
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