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  1. Fast Datapath Product
  2. FDP-70

ovn-controller fails to create more than 64K OpenFlow groups/meters

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    • OVN Sprint 44, OVN Sprint 45, OVN Sprint 46

      During an OpenShift control plane scale test, while provisioning more than 64K load balancers ovn-controller stopped creating OF groups after it reached 65535 groups.

      This artificial limit is defined in extend-table.h:

       
      #define MAX_EXT_TABLE_ID 65535
       
      OvS supports more groups/meters than that:
      /* Last usable group number. */
      OFPG_MAX = 0xffffff00,
       
      /* Last usable meter. */
      OFPM13_MAX = 0xffff0000,

      Instead of the hardcoded 64K limit ovn-controller should use the real limits.

      Symptoms:
      At scale, when running out of group IDs, ovn-controller logs:

      2023-10-02T14:05:44.497Z|00629|extend_table|ERR|65536 out of table ids.

            dceara@redhat.com Dumitru Ceara
            dceara@redhat.com Dumitru Ceara
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