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    P4C
    
   The P4 Compiler 
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| EgressInstance_t psa_global_metadata::instance | 
set by eBPF program as helper variable, read by ingress/egress
| __u8 psa_global_metadata::mark | 
set by PRE, read by Egress
| PSA_PacketPath_t psa_global_metadata::packet_path | 
| bool psa_global_metadata::pass_to_kernel | 
packet mark set by PSA/eBPF programs. Used to differentiate between packets processed by PSA/eBPF from other packets.