Add per-member multicast source filtering#924
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Implements IGMPv3/MLDv2-based source filtering for multicast subscriptions, including:
- SourceFilter and FilterMode types in oxide-vpc API
- Fast-path optimization for EXCLUDE() (accept all) case
- Per-member/port filtering on both Tx and Rx paths
- Per-next-hop forwarding filtering: Check aggregated SourceFilter before
forwarding to each remote sled
- Allows skipping forwarding to sleds where no subscriber would accept the packet
- This will involve additions to Omicron, but we have to do that anyway for OPTE changes
- DTrace probe and stats for filtered/filtered-out packets
- Benchmark(s) and integration tests
- This PR also includes optimizations to the xde test suite setup for mcast
- Note: Contains an API bump
- Minor: clippy test cleanup
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Implements IGMPv3/MLDv2-based source filtering for multicast subscriptions at two levels:
SourceFilterchecked on deliveryThis work includes:
forwarding to each remote sled
We can't really afford (stages, etc) to do this source filtering on the Tofino switch (currently), as it has to happen post-replication, which happens at the Egress portion pipeline of the sidecar. So, it makes sense to handle this in OPTE at the moment.