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-rw-r--r--include/net/inet_connection_sock.h4
-rw-r--r--include/net/tcp.h4
-rw-r--r--net/ipv4/inet_diag.c1
-rw-r--r--net/ipv4/tcp_input.c6
-rw-r--r--net/ipv4/tcp_ipv4.c1
-rw-r--r--net/ipv4/tcp_output.c3
-rw-r--r--net/ipv4/tcp_recovery.c57
-rw-r--r--net/ipv4/tcp_timer.c3
-rw-r--r--net/ipv6/tcp_ipv6.c1
9 files changed, 68 insertions, 12 deletions
diff --git a/include/net/inet_connection_sock.h b/include/net/inet_connection_sock.h
index 85ee3879499e..84b2edde09b1 100644
--- a/include/net/inet_connection_sock.h
+++ b/include/net/inet_connection_sock.h
@@ -144,6 +144,7 @@ struct inet_connection_sock {
#define ICSK_TIME_PROBE0 3 /* Zero window probe timer */
#define ICSK_TIME_EARLY_RETRANS 4 /* Early retransmit timer */
#define ICSK_TIME_LOSS_PROBE 5 /* Tail loss probe timer */
+#define ICSK_TIME_REO_TIMEOUT 6 /* Reordering timer */
static inline struct inet_connection_sock *inet_csk(const struct sock *sk)
{
@@ -234,7 +235,8 @@ static inline void inet_csk_reset_xmit_timer(struct sock *sk, const int what,
}
if (what == ICSK_TIME_RETRANS || what == ICSK_TIME_PROBE0 ||
- what == ICSK_TIME_EARLY_RETRANS || what == ICSK_TIME_LOSS_PROBE) {
+ what == ICSK_TIME_EARLY_RETRANS || what == ICSK_TIME_LOSS_PROBE ||
+ what == ICSK_TIME_REO_TIMEOUT) {
icsk->icsk_pending = what;
icsk->icsk_timeout = jiffies + when;
sk_reset_timer(sk, &icsk->icsk_retransmit_timer, icsk->icsk_timeout);
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 1439107658c2..64fcdeb3358b 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -143,6 +143,7 @@ void tcp_time_wait(struct sock *sk, int state, int timeo);
#define TCP_RESOURCE_PROBE_INTERVAL ((unsigned)(HZ/2U)) /* Maximal interval between probes
* for local resources.
*/
+#define TCP_REO_TIMEOUT_MIN (2000) /* Min RACK reordering timeout in usec */
#define TCP_KEEPALIVE_TIME (120*60*HZ) /* two hours */
#define TCP_KEEPALIVE_PROBES 9 /* Max of 9 keepalive probes */
@@ -397,6 +398,7 @@ struct sock *tcp_check_req(struct sock *sk, struct sk_buff *skb,
int tcp_child_process(struct sock *parent, struct sock *child,
struct sk_buff *skb);
void tcp_enter_loss(struct sock *sk);
+void tcp_cwnd_reduction(struct sock *sk, int newly_acked_sacked, int flag);
void tcp_clear_retrans(struct tcp_sock *tp);
void tcp_update_metrics(struct sock *sk);
void tcp_init_metrics(struct sock *sk);
@@ -541,6 +543,7 @@ int tcp_retransmit_skb(struct sock *sk, struct sk_buff *skb, int segs);
void tcp_retransmit_timer(struct sock *sk);
void tcp_xmit_retransmit_queue(struct sock *);
void tcp_simple_retransmit(struct sock *);
+void tcp_enter_recovery(struct sock *sk, bool ece_ack);
int tcp_trim_head(struct sock *, struct sk_buff *, u32);
int tcp_fragment(struct sock *, struct sk_buff *, u32, unsigned int, gfp_t);
@@ -1867,6 +1870,7 @@ extern void tcp_rack_mark_lost(struct sock *sk, const struct skb_mstamp *now);
extern void tcp_rack_advance(struct tcp_sock *tp, u8 sacked,
const struct skb_mstamp *xmit_time,
const struct skb_mstamp *ack_time);
+extern void tcp_rack_reo_timeout(struct sock *sk);
/*
* Save and compile IPv4 options, return a pointer to it
diff --git a/net/ipv4/inet_diag.c b/net/ipv4/inet_diag.c
index 4dea33e5f295..d216e40623d3 100644
--- a/net/ipv4/inet_diag.c
+++ b/net/ipv4/inet_diag.c
@@ -216,6 +216,7 @@ int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
icsk->icsk_pending == ICSK_TIME_EARLY_RETRANS ||
+ icsk->icsk_pending == ICSK_TIME_REO_TIMEOUT ||
icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
r->idiag_timer = 1;
r->idiag_retrans = icsk->icsk_retransmits;
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 8ccd171999bf..be1191829963 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -2522,8 +2522,7 @@ static void tcp_init_cwnd_reduction(struct sock *sk)
tcp_ecn_queue_cwr(tp);
}
-static void tcp_cwnd_reduction(struct sock *sk, int newly_acked_sacked,
- int flag)
+void tcp_cwnd_reduction(struct sock *sk, int newly_acked_sacked, int flag)
{
struct tcp_sock *tp = tcp_sk(sk);
int sndcnt = 0;
@@ -2691,7 +2690,7 @@ void tcp_simple_retransmit(struct sock *sk)
}
EXPORT_SYMBOL(tcp_simple_retransmit);
-static void tcp_enter_recovery(struct sock *sk, bool ece_ack)
+void tcp_enter_recovery(struct sock *sk, bool ece_ack)
{
struct tcp_sock *tp = tcp_sk(sk);
int mib_idx;
@@ -3031,6 +3030,7 @@ void tcp_rearm_rto(struct sock *sk)
u32 rto = inet_csk(sk)->icsk_rto;
/* Offset the time elapsed after installing regular RTO */
if (icsk->icsk_pending == ICSK_TIME_EARLY_RETRANS ||
+ icsk->icsk_pending == ICSK_TIME_REO_TIMEOUT ||
icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
struct sk_buff *skb = tcp_write_queue_head(sk);
const u32 rto_time_stamp =
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 56d756ecfb59..ebf3e0c4967a 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -2230,6 +2230,7 @@ static void get_tcp4_sock(struct sock *sk, struct seq_file *f, int i)
if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
icsk->icsk_pending == ICSK_TIME_EARLY_RETRANS ||
+ icsk->icsk_pending == ICSK_TIME_REO_TIMEOUT ||
icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
timer_active = 1;
timer_expires = icsk->icsk_timeout;
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 1d5331a1b1dc..0ba9026cb70d 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -2960,7 +2960,8 @@ begin_fwd:
if (tcp_in_cwnd_reduction(sk))
tp->prr_out += tcp_skb_pcount(skb);
- if (skb == tcp_write_queue_head(sk))
+ if (skb == tcp_write_queue_head(sk) &&
+ icsk->icsk_pending != ICSK_TIME_REO_TIMEOUT)
inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS,
inet_csk(sk)->icsk_rto,
TCP_RTO_MAX);
diff --git a/net/ipv4/tcp_recovery.c b/net/ipv4/tcp_recovery.c
index 557363cde58a..eb39b1b6d1dc 100644
--- a/net/ipv4/tcp_recovery.c
+++ b/net/ipv4/tcp_recovery.c
@@ -32,19 +32,18 @@ static void tcp_rack_mark_skb_lost(struct sock *sk, struct sk_buff *skb)
* The current version is only used after recovery starts but can be
* easily extended to detect the first loss.
*/
-static void tcp_rack_detect_loss(struct sock *sk, const struct skb_mstamp *now)
+static void tcp_rack_detect_loss(struct sock *sk, const struct skb_mstamp *now,
+ u32 *reo_timeout)
{
struct tcp_sock *tp = tcp_sk(sk);
struct sk_buff *skb;
u32 reo_wnd;
+ *reo_timeout = 0;
/* To be more reordering resilient, allow min_rtt/4 settling delay
* (lower-bounded to 1000uS). We use min_rtt instead of the smoothed
* RTT because reordering is often a path property and less related
* to queuing or delayed ACKs.
- *
- * TODO: measure and adapt to the observed reordering delay, and
- * use a timer to retransmit like the delayed early retransmit.
*/
reo_wnd = 1000;
if (tp->rack.reord && tcp_min_rtt(tp) != ~0U)
@@ -66,10 +65,23 @@ static void tcp_rack_detect_loss(struct sock *sk, const struct skb_mstamp *now)
* A packet is lost if its elapsed time is beyond
* the recent RTT plus the reordering window.
*/
- if (skb_mstamp_us_delta(now, &skb->skb_mstamp) >
- tp->rack.rtt_us + reo_wnd) {
+ u32 elapsed = skb_mstamp_us_delta(now,
+ &skb->skb_mstamp);
+ s32 remaining = tp->rack.rtt_us + reo_wnd - elapsed;
+
+ if (remaining < 0) {
tcp_rack_mark_skb_lost(sk, skb);
+ continue;
}
+
+ /* Skip ones marked lost but not yet retransmitted */
+ if ((scb->sacked & TCPCB_LOST) &&
+ !(scb->sacked & TCPCB_SACKED_RETRANS))
+ continue;
+
+ /* Record maximum wait time (+1 to avoid 0) */
+ *reo_timeout = max_t(u32, *reo_timeout, 1 + remaining);
+
} else if (!(scb->sacked & TCPCB_RETRANS)) {
/* Original data are sent sequentially so stop early
* b/c the rest are all sent after rack_sent
@@ -82,12 +94,19 @@ static void tcp_rack_detect_loss(struct sock *sk, const struct skb_mstamp *now)
void tcp_rack_mark_lost(struct sock *sk, const struct skb_mstamp *now)
{
struct tcp_sock *tp = tcp_sk(sk);
+ u32 timeout;
if (inet_csk(sk)->icsk_ca_state < TCP_CA_Recovery || !tp->rack.advanced)
return;
+
/* Reset the advanced flag to avoid unnecessary queue scanning */
tp->rack.advanced = 0;
- tcp_rack_detect_loss(sk, now);
+ tcp_rack_detect_loss(sk, now, &timeout);
+ if (timeout) {
+ timeout = usecs_to_jiffies(timeout + TCP_REO_TIMEOUT_MIN);
+ inet_csk_reset_xmit_timer(sk, ICSK_TIME_REO_TIMEOUT,
+ timeout, inet_csk(sk)->icsk_rto);
+ }
}
/* Record the most recently (re)sent time among the (s)acked packets
@@ -123,3 +142,27 @@ void tcp_rack_advance(struct tcp_sock *tp, u8 sacked,
tp->rack.mstamp = *xmit_time;
tp->rack.advanced = 1;
}
+
+/* We have waited long enough to accommodate reordering. Mark the expired
+ * packets lost and retransmit them.
+ */
+void tcp_rack_reo_timeout(struct sock *sk)
+{
+ struct tcp_sock *tp = tcp_sk(sk);
+ struct skb_mstamp now;
+ u32 timeout, prior_inflight;
+
+ skb_mstamp_get(&now);
+ prior_inflight = tcp_packets_in_flight(tp);
+ tcp_rack_detect_loss(sk, &now, &timeout);
+ if (prior_inflight != tcp_packets_in_flight(tp)) {
+ if (inet_csk(sk)->icsk_ca_state != TCP_CA_Recovery) {
+ tcp_enter_recovery(sk, false);
+ if (!inet_csk(sk)->icsk_ca_ops->cong_control)
+ tcp_cwnd_reduction(sk, 1, 0);
+ }
+ tcp_xmit_retransmit_queue(sk);
+ }
+ if (inet_csk(sk)->icsk_pending != ICSK_TIME_RETRANS)
+ tcp_rearm_rto(sk);
+}
diff --git a/net/ipv4/tcp_timer.c b/net/ipv4/tcp_timer.c
index 29a9bd5f1225..953c02a8566e 100644
--- a/net/ipv4/tcp_timer.c
+++ b/net/ipv4/tcp_timer.c
@@ -563,6 +563,9 @@ void tcp_write_timer_handler(struct sock *sk)
event = icsk->icsk_pending;
switch (event) {
+ case ICSK_TIME_REO_TIMEOUT:
+ tcp_rack_reo_timeout(sk);
+ break;
case ICSK_TIME_EARLY_RETRANS:
tcp_resume_early_retransmit(sk);
break;
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 228965dca3c5..f52c3742b404 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -1746,6 +1746,7 @@ static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i)
if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
icsk->icsk_pending == ICSK_TIME_EARLY_RETRANS ||
+ icsk->icsk_pending == ICSK_TIME_REO_TIMEOUT ||
icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
timer_active = 1;
timer_expires = icsk->icsk_timeout;
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.