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Each time a QUIC frame is emitted, mux-quic layer is notified via a callback to update the underlying QCS. For QUIC, this is performed via qc_stream_desc element. In QMux protocol, this can be simplified as there is no qc_stream_desc/quic_conn layer interaction. Instead, each time snd_buf is called, QCS can be updated immediately using its return value. This is performed via a new function qstrm_ctrl_send(). Its work is similar to the QUIC equivalent but in a simpler mode. In particular, sent data can be immediately removed from the Tx buffer as there is no need for retransmission when running above TCP.