Review – 16469 `mac_rx_flow` should attempt to preserve mblk_t chains

Review – 16469 `mac_rx_flow` should attempt to preserve mblk_t chains

[kyle]

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Hello,

Could you please review the below change?

https://www.illumos.org/issues/16469
https://code.illumos.org/c/illumos-gate/+/3419

This change ports the chain processing logic from
mac_rx_srs_subflow_process into mac_rx_flow, which allows for mblk_t
chains to be received when a mac ring is set to MAC_SW_CLASSIFIER.

This does include some minor logical differences -- packets which do not
match a flent in the mac_impl_t's flow table will not cause the
in-progress chain to be flushed, as all of these packets are already
placed into a separate chain to be freed. This has the benefit of
allowing larger chains if the device also happens to be in promiscuous
mode.

Thanks,
--Kyle

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