smc_cdc_cursor
static inline void smc_curs_copy_net(union smc_cdc_cursor *tgt,
union smc_cdc_cursor *src,
static inline void smc_host_cursor_to_cdc(union smc_cdc_cursor *peer,
union smc_cdc_cursor *peer,
union smc_cdc_cursor net;
union smc_cdc_cursor prod;
union smc_cdc_cursor cons; /* piggy backed "ack" */