ethernet: add checksum offloading#194
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Validate IP header and payload checksums on received frames when MACCR.IPC (Checksum Offload) is enabled. Report results via IpHeaderError, IpPayloadError, and IpChecksumBypassed fields in the RX descriptor writeback. UDP checksum validation is skipped for IPv4 when the checksum field is zero, per RFC 768.
TX checksum insertion was incorrectly gated on MACCR.IPC, which only controls RX checksum offload. TX checksum insertion is controlled by the per-descriptor CIC (Checksum Insertion Control) field per the DWC spec. This caused packets to be transmitted with zero checksums when IPC was not set, even though the firmware requested checksum insertion via the descriptor. TSO now unconditionally enables checksum offload as segmentation inherently requires it.
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