MINOR: quic-be: qc_send_mux() adaptation for 0-RTT

When entering this function, a selection is done about the encryption level
to be used to send data. For a client, the early data encryption level
is used to send 0-RTT if this encryption level is initialized.

The Initial encryption is also registered to the send list for clients if there
is Initial crypto data to send. This allow Initial and 0-RTT packets to
be coalesced by datagrams.

diff --git a/src/quic_tx.c b/src/quic_tx.c
index 5d7c20efcc7204c722c8669ba1d272c9ccaa41e7..a0de690ee72de9e45982b34480fbe33585263b14 100644 (file)
--- a/src/quic_tx.c
+++ b/src/quic_tx.c
@@ -516,6 +516,8 @@ enum quic_tx_err qc_send_mux(struct quic_conn *qc, struct list *frms,
        struct list send_list = LIST_HEAD_INIT(send_list);
        enum quic_tx_err ret = QUIC_TX_ERR_NONE;
        int max_dgram = 0, sent;
+       struct quic_enc_level *qel = !qc_is_back(qc) ? qc->ael :
+               qc->eel ? qc->eel : qc->ael;
 
        TRACE_ENTER(QUIC_EV_CONN_TXPKT, qc);
        BUG_ON(qc->mux_state != QC_MUX_READY); /* Only MUX can uses this function so it must be ready. */
@@ -526,6 +528,10 @@ enum quic_tx_err qc_send_mux(struct quic_conn *qc, struct list *frms,
                return QUIC_TX_ERR_FATAL;
        }
 
+       /* The QUIC client may need to send Initial CRYPTO data before early data. */
+       if (qc_is_back(qc) && qel == qc->eel && qel_need_sending(qc->iel, qc))
+               qel_register_send(&send_list, qc->iel, &qc->iel->pktns->tx.frms);
+
        /* Try to send post handshake frames first unless on 0-RTT. */
        if ((qc->flags & QUIC_FL_CONN_NEED_POST_HANDSHAKE_FRMS) &&
            qc->state >= QUIC_HS_ST_COMPLETE) {
@@ -540,7 +546,7 @@ enum quic_tx_err qc_send_mux(struct quic_conn *qc, struct list *frms,
        }
 
        TRACE_STATE("preparing data (from MUX)", QUIC_EV_CONN_TXPKT, qc);
-       qel_register_send(&send_list, qc->ael, frms);
+       qel_register_send(&send_list, qel, frms);
        sent = qc_send(qc, 0, &send_list, max_dgram);
 
        if (pacer && qc->path->cc.algo->check_app_limited)