rds_session_lkup
sp = rds_session_lkup(statep, ipcm_info.SRCIP, rgid.gid_guid);
sp = rds_session_lkup(statep, ipcm_info.SRCIP,
oldp = rds_session_lkup(statep, remip, 0);
sp = rds_session_lkup(rdsib_statep, recvip, 0);
sp = rds_session_lkup(rdsib_statep, recvip, 0);
rds_session_t *rds_session_lkup(rds_state_t *statep, ipaddr_t destip,