[viona, mac-filter, mcast] install guest multicast MAC filter tables via V7 ioctls - #1210
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…via V7 ioctls Guest multicast interest has been driven by `VIONA_PROMISC_MULTI`, delivering multicast frames for the guests to filter. We saw duplication issues at guest Rx when packets reached both the classified and promiscuous callbacks. This led to the viona interface V7 scoped changes in [illumos-gate](https://github.com/oxidecomputer/illumos-gate/blob/5ffff4b86e486e1f9d7860be1368386699a7829a) / [change 775](https://code.oxide.computer/c/illumos-gate/+/775). Given the upstream changes, this work introduces `VNA_IOC_SET_MAC_FILTERS` to install guest multicast tables on the underlay MAC client backing viona. `VNA_IOC_GET_MAC_FILTERS` is used for reading back installed entries from the table. Classified delivery can replace all-multicast mode once the guest supplies a table that fits and no broader receive mode is necessary. All-multicast remains the fallback for guests that haven't sent a table request or have exceeded the kernel's capacity. Most of the work here goes into handling ioctl failures, semantic result codes, and fallback. This includes explicit multicast table management, reset handling, and Falcon-build `AllVlan` logic. Most importantly (most scary), this raises the minimum required host viona API to V7. We're keeping the V1 viona state payload for now, with import / export handling for the multicast table state. This is the first of a few different PRs upcoming, including - [ ] CTRL_RX receive-mode handling - [ ] send notification on `NEEDS_RESET` status
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Guest multicast interest has been driven by
VIONA_PROMISC_MULTI, delivering multicast frames for the guests to filter. We saw duplication issues at guest Rx when packets reached both the classified and promiscuous callbacks. This led to the viona interface V7 scoped changes in illumos-gate / change 775.Given the upstream changes, this work introduces
VNA_IOC_SET_MAC_FILTERSto install guest multicast tables on the underlay MAC client backing viona.VNA_IOC_GET_MAC_FILTERSis used for reading back installed entries from the table. Classified delivery can replace all-multicast mode once the guest supplies a table that fits and no broader receive mode is necessary. All-multicast remains the fallback for guests that haven't sent a table request or have exceeded the kernel's capacity.Most of the work here goes into handling ioctl failures, semantic result codes, and fallback. This includes explicit multicast table management, reset handling, and Falcon-build
AllVlanlogic.Most importantly (most scary), this raises the minimum required host viona API to V7. We're keeping the V1 viona state payload for now, with import / export handling for the multicast table state.
Note: This work will fail on CI as don't have special handling. Chat with @iximeow for more.
This is the first of a few different PRs upcoming, including
NEEDS_RESETstatus