This counter tracks packets input to this module that were dropped before any crypto processing was even attempted, since the last reboot. Because these drops happen prior to processing, they point to a resource or queueing problem at the module's input stage, like the accelerator being overwhelmed, rather than any issue with the cryptographic operation itself. If this counter rises in step with ccaAcclInPkts approaching a module's throughput ceiling, that pattern confirms the module is being overrun and dropping work before it can even attempt to process it.