Line data    Source code

       1             : #ifndef HEADER_fd_src_discof_failover_fd_failover_bus_h
       2             : #define HEADER_fd_src_discof_failover_fd_failover_bus_h
       3             : 
       4             : /* The admin and failover tiles talk over the admin_failov and
       5             :    failov_admin links.  The admin tile is the only adminctl poller.  It
       6             :    forwards failover commands with a nonce and parks the adminctl slot
       7             :    until the response comes back, which for a handoff or promotion is
       8             :    when its outcome is known.  The failover tile asks for identity
       9             :    switches the same way.  Every frame is one fd_failover_bus_msg_t.
      10             :    Both links are reliable, so no frame is lost behind a busy tile. */
      11             : 
      12             : #include "../admin/fd_adminctl.h"
      13             : 
      14             : #define FD_FAILOVER_BUS_PAYLOAD_MAX (256UL)
      15             : 
      16             : /* bus message types */
      17             : 
      18          45 : #define FD_FAILOVER_BUS_SWITCH_REQ      (1UL) /* failov to admin: fd_failover_switch_req_t */
      19          42 : #define FD_FAILOVER_BUS_SWITCH_RESP     (2UL) /* admin to failov: fd_failover_switch_resp_t */
      20          54 : #define FD_FAILOVER_BUS_REQUEST         (3UL) /* admin to failov: fd_adminctl_failover_req_t */
      21           3 : #define FD_FAILOVER_BUS_RESPONSE        (4UL) /* failov to admin: the result of the command with the corresponding nonce and payload */
      22          60 : #define FD_FAILOVER_BUS_OPERATOR_ACTION (5UL) /* admin to failov: fd_failover_operator_t, set-identity ran */
      23           0 : #define FD_FAILOVER_BUS_STEP            (6UL) /* failov to admin: a step of the command with that nonce, a cstr payload */
      24             : 
      25         156 : #define FD_FAILOVER_BUS_STEP_MAX (FD_ADMINCTL_STEP_MAX)
      26             : 
      27             : /* result codes */
      28             : 
      29          39 : #define FD_FAILOVER_SWITCH_OK                   (0UL)
      30           9 : #define FD_FAILOVER_SWITCH_ERR_DISABLED         (1UL)
      31           6 : #define FD_FAILOVER_SWITCH_ERR_STALE            (2UL)
      32           0 : #define FD_FAILOVER_SWITCH_ERR_AUTHORIZED_VOTER (3UL) /* the target is an authorized voter, nothing switched */
      33             : 
      34             : /* bus message structs */
      35             : 
      36             : struct fd_failover_operator {
      37             :   ulong epoch;
      38             :   uchar identity[ 32 ];
      39             :   uchar failover_identity[ 32 ];
      40             : };
      41             : typedef struct fd_failover_operator fd_failover_operator_t;
      42             : FD_STATIC_ASSERT( sizeof(fd_failover_operator_t)<=FD_FAILOVER_BUS_PAYLOAD_MAX, operator_fits );
      43             : 
      44             : struct fd_failover_switch_req {
      45             :   uchar identity[ 32 ]; /* public key of the identity to install */
      46             :   ulong epoch;
      47             : };
      48             : typedef struct fd_failover_switch_req fd_failover_switch_req_t;
      49             : FD_STATIC_ASSERT( sizeof(fd_failover_switch_req_t)<=FD_FAILOVER_BUS_PAYLOAD_MAX, switch_req_fits );
      50             : 
      51             : struct fd_failover_switch_resp {
      52             :   ulong                  result;
      53             :   ulong                  history_watermark;
      54             :   fd_failover_operator_t operator;
      55             : };
      56             : typedef struct fd_failover_switch_resp fd_failover_switch_resp_t;
      57             : FD_STATIC_ASSERT( sizeof(fd_failover_switch_resp_t)<=FD_FAILOVER_BUS_PAYLOAD_MAX, switch_resp_fits );
      58             : 
      59             : /* bus message framing */
      60             : 
      61             : struct fd_failover_bus_msg {
      62             :   ulong nonce;  /* per request, echoed on the response */
      63             :   ulong result; /* the adminctl result for command responses */
      64             :   uchar payload[ FD_FAILOVER_BUS_PAYLOAD_MAX ];
      65             : };
      66             : typedef struct fd_failover_bus_msg fd_failover_bus_msg_t;
      67             : 
      68           0 : #define FD_FAILOVER_BUS_MTU (sizeof(fd_failover_bus_msg_t))
      69             : FD_STATIC_ASSERT( sizeof(fd_failover_bus_msg_t)==272UL, bus_layout );
      70             : 
      71             : FD_STATIC_ASSERT( sizeof(fd_adminctl_failover_req_t)<=FD_FAILOVER_BUS_PAYLOAD_MAX, command_fits );
      72             : FD_STATIC_ASSERT( FD_FAILOVER_BUS_STEP_MAX<=FD_FAILOVER_BUS_PAYLOAD_MAX, step_fits );
      73             : 
      74             : #endif /* HEADER_fd_src_discof_failover_fd_failover_bus_h */