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MINOR: mux-quic: do not count stream flow-control if already closed

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It is unnecessary to increase stream credit once its size is known.
Indeed, a peer cannot sent a greater offset than the value advertized.
Else, connection will be closed on STREAM reception with
FINAL_SIZE_ERROR.

This commit is a small optimization and may prevent the emission of
unneeded MAX_STREAM_DATA frames on some occasions.

It should be backported up to 2.7.
This commit is contained in:
Amaury Denoyelle 2022-12-09 15:00:17 +01:00
parent a473f196f1
commit bb6296ce06
1 changed files with 5 additions and 0 deletions
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5
src/mux_quic.c
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@ -696,6 +696,10 @@ static void qcs_consume(struct qcs *qcs, uint64_t bytes)
qc_free_ncbuf(qcs, buf);
qcs->rx.offset += bytes;
/* Not necessary to emit a MAX_STREAM_DATA if all data received. */
if (qcs->flags & QC_SF_SIZE_KNOWN)
goto conn_fctl;
if (qcs->rx.msd - qcs->rx.offset < qcs->rx.msd_init / 2) {
TRACE_DATA("increase stream credit via MAX_STREAM_DATA", QMUX_EV_QCS_RECV, qcc->conn, qcs);
frm = pool_zalloc(pool_head_quic_frame);
@ -712,6 +716,7 @@ static void qcs_consume(struct qcs *qcs, uint64_t bytes)
tasklet_wakeup(qcc->wait_event.tasklet);
}
conn_fctl:
qcc->lfctl.offsets_consume += bytes;
if (qcc->lfctl.md - qcc->lfctl.offsets_consume < qcc->lfctl.md_init / 2) {
TRACE_DATA("increase conn credit via MAX_DATA", QMUX_EV_QCS_RECV, qcc->conn, qcs);