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esp4_offload/esp6_offload provide GSO/GRO batching for ESP and are not autoloaded when an SA is created, costing around a third of the mesh's encrypted throughput. Load the one matching each secured mesh's underlay family. Also document the per-SA single-core limit and pcrypt as an option. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>