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Brings in the performance work which gets us out of promiscuous mode, and then builds on having access to multiple packets at a time in the Rx callback.
Tested on racklettes on a few occasions up til now, where we're looking at >10Gbps single TCP stream (for LRO-aware guests). Helios-2.8 image is able to load and interact with the driver, so we're good on an a4x2 front.
0.37.387 exists, but requires rustc v1.88.0+ due to if-let chains.