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MINOR: mux-quic: complete traces for qcs emission

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Add traces for _qc_send_qcs() function. Most notably, traces have been
added each time a qc_stream_desc buffer allocation fails and when stream
or connection flow-level is reached. This should improve debugging for
emission issues.

This must be backported up to 2.7.
This commit is contained in:
Amaury Denoyelle 2023-03-22 11:58:32 +01:00
parent 178fbffda1
commit 1ec78ff421
1 changed files with 13 additions and 4 deletions
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17
src/mux_quic.c
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@ -1416,13 +1416,17 @@ static int qcs_xfer_data(struct qcs *qcs, struct buffer *out, struct buffer *in)
BUG_ON_HOT(qcs->tx.offset > qcs->tx.msd);
/* do not exceed flow control limit */
if (qcs->tx.offset + to_xfer > qcs->tx.msd)
if (qcs->tx.offset + to_xfer > qcs->tx.msd) {
TRACE_DATA("do not exceed stream flow control", QMUX_EV_QCS_SEND, qcc->conn, qcs);
to_xfer = qcs->tx.msd - qcs->tx.offset;
}
BUG_ON_HOT(qcc->tx.offsets > qcc->rfctl.md);
/* do not overcome flow control limit on connection */
if (qcc->tx.offsets + to_xfer > qcc->rfctl.md)
if (qcc->tx.offsets + to_xfer > qcc->rfctl.md) {
TRACE_DATA("do not exceed conn flow control", QMUX_EV_QCS_SEND, qcc->conn, qcs);
to_xfer = qcc->rfctl.md - qcc->tx.offsets;
}
if (!left && !to_xfer)
goto out;
@ -1749,18 +1753,21 @@ static int _qc_send_qcs(struct qcs *qcs, struct list *frms)
int xfer = 0;
char fin = 0;
TRACE_ENTER(QMUX_EV_QCS_SEND, qcc->conn, qcs);
/* Cannot send STREAM on remote unidirectional streams. */
BUG_ON(quic_stream_is_uni(qcs->id) && quic_stream_is_remote(qcc, qcs->id));
/* Allocate <out> buffer if necessary. */
if (!out) {
if (qcc->flags & QC_CF_CONN_FULL)
return 0;
goto out;
out = qc_stream_buf_alloc(qcs->stream, qcs->tx.offset);
if (!out) {
TRACE_STATE("cannot allocate stream desc buffer", QMUX_EV_QCS_SEND, qcc->conn, qcs);
qcc->flags |= QC_CF_CONN_FULL;
return 0;
goto out;
}
}
@ -1791,6 +1798,8 @@ static int _qc_send_qcs(struct qcs *qcs, struct list *frms)
if (ret < 0) { ABORT_NOW(); /* TODO handle this properly */ }
}
out:
TRACE_LEAVE(QMUX_EV_QCS_SEND, qcc->conn, qcs);
return xfer;
}