[SDFAB-1084] Wipe out state from BESS on restart

[osinstom]

TODO:

• test with real BESS

[osinstom]

Report from testing with real BESS:

1. Run BESS with ./scripts/docker_setup.sh in sim mode
2. Setup PFCP sessions: docker exec -ti bess-pfcpiface pfcpiface -config /conf/upf.json -simulate create
3. Check that rules have been installed:

$ ./bessctl show module pdrLookup
  pdrLookup::WildcardMatch(8 fields, 6244 rules)

4. Restart pfcpiface Docker container with docker restart

5. Check rules have been cleared.

$ ./bessctl show module pdrLookup
  pdrLookup::WildcardMatch(8 fields, 0 rules)
    Per-packet metadata fields:
      src_iface: read   1 bytes at offset 12
tunnel_ipv4_dst: read   4 bytes at offset 44
           teid: read   4 bytes at offset 40
         src_ip: read   4 bytes at offset 28
         dst_ip: read   4 bytes at offset 32
       src_port: read   2 bytes at offset 14
       dst_port: read   2 bytes at offset 36
       ip_proto: read   1 bytes at offset 13
         pdr_id: write  4 bytes (no downstream reader)
          fseid: write  8 bytes at offset 16
         ctr_id: write  4 bytes (no downstream reader)
         qer_id: write  4 bytes at offset 24
         far_id: write  4 bytes at offset 8
         
 $ ./bessctl show module farLookup
  farLookup::ExactMatch(2 fields, 0 rules)
    Per-packet metadata fields:
         far_id: read   4 bytes at offset 8
          fseid: read   8 bytes at offset 16
         action: write  1 bytes at offset 36
tunnel_out_type: write  1 bytes at offset 12
tunnel_out_src_ip4addr: write  4 bytes at offset 32
tunnel_out_dst_ip4addr: write  4 bytes at offset 24
tunnel_out_teid: write  4 bytes at offset 28
tunnel_out_udp_port: write  2 bytes at offset 14

$ ./bessctl show module appQERLookup
  appQERLookup::Qos(3 fields, 0 rules)
    Per-packet metadata fields:
      src_iface: read   1 bytes at offset 12
         qer_id: read   4 bytes at offset 24
          fseid: read   8 bytes at offset 16
            qfi: write  1 bytes at offset 13
            
$ ./bessctl show module sessionQERLookup
  sessionQERLookup::Qos(2 fields, 0 rules)
    Per-packet metadata fields:
      src_iface: read   1 bytes at offset 12
          fseid: read   8 bytes at offset 16                    

[osinstom]

@ccascone just to confirm, is that in line with your understanding of what should be done in SDFAB-1084?

[pudelkoM]

Code looks good, can't comment on the jira ticket.