Here are the data structures with brief descriptions:

Cosmo_trx_ep
Cosmo_trx_ep_chan
Cosmo_trxc_client
Cosmo_trxc_msg	A single de-/serialized TRXC message
Cosmo_trxc_setslot	Parsed SETSLOT parameters
Cosmo_trxc_setslot_tsc	One "C<tsc>/S<tsc_set>" override, as used by SETSLOT for (VAMOS) sub-channels that don't use the endpoint-wide TSC (SETTSC)
Cosmo_trxd_burst_ind	TRX -> L1: received burst indication (soft bits + measurements)
Cosmo_trxd_burst_req	L1 -> TRX: burst transmit request (hard bits)
Cosmo_trxd_parse_state	Parser state, keeping cross-PDU context for TRXDv2 batches
Ctrxc_cmd_entry	A single command in the queue
Ctrxc_setformat_ctx	Per-call SETFORMAT negotiation state, passed as cb_data through osmo_trxc_client_send_cmd() and freed in setformat_rsp_cb()