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CLEANUP: quic: Remove a useless check in qc_lstnr_pkt_rcv()

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This function parses the QUIC packet from a UDP datagram. It was originally
supposed to be run by several thread. Here we remove a section of code
where the current thread checks there is not another thread which has already
inserted the new quic_conn it is trying to insert in the connections tree.

Must be backported to 2.6 to ease the future backports to come.

(cherry picked from commit 560ddfa0035cd747c2f87d70aae2fe897dfef226)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
This commit is contained in:
Frédéric Lécaille 2022-08-24 18:59:23 +02:00 committed by Christopher Faulet
parent 2fd17a0d68
commit aaf95c19f7
1 changed files with 5 additions and 26 deletions
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31
src/xprt_quic.c
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@ -5236,7 +5236,7 @@ static void qc_lstnr_pkt_rcv(unsigned char *buf, const unsigned char *end,
struct quic_dgram *dgram, struct list **tasklist_head)
{
unsigned char *beg, *payload;
struct quic_conn *qc, *qc_to_purge = NULL;
struct quic_conn *qc;
struct listener *l;
struct proxy *prx;
struct quic_counters *prx_counters;
@ -5403,7 +5403,6 @@ static void qc_lstnr_pkt_rcv(unsigned char *buf, const unsigned char *end,
qc = retrieve_qc_conn_from_cid(pkt, l, &dgram->saddr);
if (!qc) {
int ipv4;
struct ebmb_node *n = NULL;
if (pkt->type != QUIC_PACKET_TYPE_INITIAL) {
TRACE_PROTO("Non Initial packet", QUIC_EV_CONN_LPKT);
@ -5442,31 +5441,11 @@ static void qc_lstnr_pkt_rcv(unsigned char *buf, const unsigned char *end,
HA_ATOMIC_INC(&prx_counters->half_open_conn);
/* Insert the DCID the QUIC client has chosen (only for listeners) */
n = ebmb_insert(&quic_dghdlrs[tid].odcids, &qc->odcid_node,
qc->odcid.len + qc->odcid.addrlen);
/* If the insertion failed, it means that another
* thread has already allocated a QUIC connection for
* the same CID. Liberate our allocated connection.
*/
if (unlikely(n != &qc->odcid_node)) {
qc_to_purge = qc;
qc = ebmb_entry(n, struct quic_conn, odcid_node);
pkt->qc = qc;
}
if (likely(!qc_to_purge)) {
/* Enqueue this packet. */
pkt->qc = qc;
}
else {
quic_conn_release(qc_to_purge);
}
}
else {
pkt->qc = qc;
ebmb_insert(&quic_dghdlrs[tid].odcids, &qc->odcid_node,
qc->odcid.len + qc->odcid.addrlen);
}
pkt->qc = qc;
}
else {
if (end - buf < QUIC_HAP_CID_LEN) {