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authorSean Bruno <sbruno@FreeBSD.org>2017-07-25 15:08:52 +0000
committerSean Bruno <sbruno@FreeBSD.org>2017-07-25 15:08:52 +0000
commit43053c125a6389ac7dbcc12c2d9f7c795c05aafa (patch)
tree7ece3c63aca4ada948520b0d78df1087ba7b81ef /sys
parent5d53981a18a684fd4ac3321415e0811939c438c1 (diff)
Notes
Diffstat (limited to 'sys')
-rw-r--r--sys/netinet/cc/cc_cdg.c15
-rw-r--r--sys/netinet/cc/cc_chd.c8
-rw-r--r--sys/netinet/cc/cc_cubic.c15
-rw-r--r--sys/netinet/cc/cc_dctcp.c19
-rw-r--r--sys/netinet/cc/cc_htcp.c11
-rw-r--r--sys/netinet/cc/cc_newreno.c23
-rw-r--r--sys/netinet/tcp_input.c34
-rw-r--r--sys/netinet/tcp_stacks/fastpath.c22
8 files changed, 36 insertions, 111 deletions
diff --git a/sys/netinet/cc/cc_cdg.c b/sys/netinet/cc/cc_cdg.c
index b9049fb7222b..04e2f7be5145 100644
--- a/sys/netinet/cc/cc_cdg.c
+++ b/sys/netinet/cc/cc_cdg.c
@@ -431,11 +431,6 @@ static void
cdg_cong_signal(struct cc_var *ccv, uint32_t signal_type)
{
struct cdg *cdg_data = ccv->cc_data;
- uint32_t cwin;
- u_int mss;
-
- cwin = CCV(ccv, snd_cwnd);
- mss = CCV(ccv, t_maxseg);
switch(signal_type) {
case CC_CDG_DELAY:
@@ -453,7 +448,7 @@ cdg_cong_signal(struct cc_var *ccv, uint32_t signal_type)
*/
if (IN_CONGRECOVERY(CCV(ccv, t_flags)) ||
cdg_data->queue_state < CDG_Q_FULL) {
- CCV(ccv, snd_ssthresh) = cwin;
+ CCV(ccv, snd_ssthresh) = CCV(ccv, snd_cwnd);
CCV(ccv, snd_recover) = CCV(ccv, snd_max);
} else {
/*
@@ -466,17 +461,13 @@ cdg_cong_signal(struct cc_var *ccv, uint32_t signal_type)
cdg_data->shadow_w, RENO_BETA);
CCV(ccv, snd_ssthresh) = max(cdg_data->shadow_w,
- cdg_window_decrease(ccv, cwin, V_cdg_beta_loss));
- CCV(ccv, snd_cwnd) = CCV(ccv, snd_ssthresh);
+ cdg_window_decrease(ccv, CCV(ccv, snd_cwnd),
+ V_cdg_beta_loss));
cdg_data->window_incr = cdg_data->rtt_count = 0;
}
ENTER_RECOVERY(CCV(ccv, t_flags));
break;
- case CC_RTO:
- CCV(ccv, snd_ssthresh) = max(2*mss, cwin/2);
- CCV(ccv, snd_cwnd) = mss;
- break;
default:
newreno_cc_algo.cong_signal(ccv, signal_type);
break;
diff --git a/sys/netinet/cc/cc_chd.c b/sys/netinet/cc/cc_chd.c
index fd2f6b8ec1b6..d7b53fec4d6a 100644
--- a/sys/netinet/cc/cc_chd.c
+++ b/sys/netinet/cc/cc_chd.c
@@ -330,14 +330,10 @@ chd_cong_signal(struct cc_var *ccv, uint32_t signal_type)
struct ertt *e_t;
struct chd *chd_data;
int qdly;
- uint32_t cwin;
- u_int mss;
e_t = khelp_get_osd(CCV(ccv, osd), ertt_id);
chd_data = ccv->cc_data;
qdly = imax(e_t->rtt, chd_data->maxrtt_in_rtt) - e_t->minrtt;
- cwin = CCV(ccv, snd_cwnd);
- mss = CCV(ccv, t_maxseg);
switch(signal_type) {
case CC_CHD_DELAY:
@@ -377,10 +373,6 @@ chd_cong_signal(struct cc_var *ccv, uint32_t signal_type)
}
ENTER_FASTRECOVERY(CCV(ccv, t_flags));
break;
- case CC_RTO:
- CCV(ccv, snd_ssthresh) = max(2*mss, cwin/2);
- CCV(ccv, snd_cwnd) = mss;
- break;
default:
newreno_cc_algo.cong_signal(ccv, signal_type);
diff --git a/sys/netinet/cc/cc_cubic.c b/sys/netinet/cc/cc_cubic.c
index d2304d227487..64398faa929b 100644
--- a/sys/netinet/cc/cc_cubic.c
+++ b/sys/netinet/cc/cc_cubic.c
@@ -225,12 +225,8 @@ static void
cubic_cong_signal(struct cc_var *ccv, uint32_t type)
{
struct cubic *cubic_data;
- uint32_t cwin;
- u_int mss;
cubic_data = ccv->cc_data;
- cwin = CCV(ccv, snd_cwnd);
- mss = CCV(ccv, t_maxseg);
switch (type) {
case CC_NDUPACK:
@@ -239,8 +235,7 @@ cubic_cong_signal(struct cc_var *ccv, uint32_t type)
cubic_ssthresh_update(ccv);
cubic_data->num_cong_events++;
cubic_data->prev_max_cwnd = cubic_data->max_cwnd;
- cubic_data->max_cwnd = cwin;
- CCV(ccv, snd_cwnd) = CCV(ccv, snd_ssthresh);
+ cubic_data->max_cwnd = CCV(ccv, snd_cwnd);
}
ENTER_RECOVERY(CCV(ccv, t_flags));
}
@@ -251,7 +246,7 @@ cubic_cong_signal(struct cc_var *ccv, uint32_t type)
cubic_ssthresh_update(ccv);
cubic_data->num_cong_events++;
cubic_data->prev_max_cwnd = cubic_data->max_cwnd;
- cubic_data->max_cwnd = cwin;
+ cubic_data->max_cwnd = CCV(ccv, snd_cwnd);
cubic_data->t_last_cong = ticks;
CCV(ccv, snd_cwnd) = CCV(ccv, snd_ssthresh);
ENTER_CONGRECOVERY(CCV(ccv, t_flags));
@@ -266,13 +261,9 @@ cubic_cong_signal(struct cc_var *ccv, uint32_t type)
* chance the first one is a false alarm and may not indicate
* congestion.
*/
- if (CCV(ccv, t_rxtshift) >= 2) {
+ if (CCV(ccv, t_rxtshift) >= 2)
cubic_data->num_cong_events++;
cubic_data->t_last_cong = ticks;
- cubic_ssthresh_update(ccv);
- cubic_data->max_cwnd = cwin;
- CCV(ccv, snd_cwnd) = mss;
- }
break;
}
}
diff --git a/sys/netinet/cc/cc_dctcp.c b/sys/netinet/cc/cc_dctcp.c
index e79fb19d96da..ce75750fef8b 100644
--- a/sys/netinet/cc/cc_dctcp.c
+++ b/sys/netinet/cc/cc_dctcp.c
@@ -230,11 +230,10 @@ static void
dctcp_cong_signal(struct cc_var *ccv, uint32_t type)
{
struct dctcp *dctcp_data;
- uint32_t cwin;
- u_int mss;
+ u_int win, mss;
dctcp_data = ccv->cc_data;
- cwin = CCV(ccv, snd_cwnd);
+ win = CCV(ccv, snd_cwnd);
mss = CCV(ccv, t_maxseg);
switch (type) {
@@ -242,16 +241,16 @@ dctcp_cong_signal(struct cc_var *ccv, uint32_t type)
if (!IN_FASTRECOVERY(CCV(ccv, t_flags))) {
if (!IN_CONGRECOVERY(CCV(ccv, t_flags))) {
CCV(ccv, snd_ssthresh) = mss *
- max(cwin / 2 / mss, 2);
+ max(win / 2 / mss, 2);
dctcp_data->num_cong_events++;
} else {
/* cwnd has already updated as congestion
* recovery. Reverse cwnd value using
* snd_cwnd_prev and recalculate snd_ssthresh
*/
- cwin = CCV(ccv, snd_cwnd_prev);
+ win = CCV(ccv, snd_cwnd_prev);
CCV(ccv, snd_ssthresh) =
- max(cwin / 2 / mss, 2) * mss;
+ max(win / 2 / mss, 2) * mss;
}
ENTER_RECOVERY(CCV(ccv, t_flags));
}
@@ -261,18 +260,18 @@ dctcp_cong_signal(struct cc_var *ccv, uint32_t type)
* Save current snd_cwnd when the host encounters both
* congestion recovery and fast recovery.
*/
- CCV(ccv, snd_cwnd_prev) = cwin;
+ CCV(ccv, snd_cwnd_prev) = win;
if (!IN_CONGRECOVERY(CCV(ccv, t_flags))) {
if (V_dctcp_slowstart &&
dctcp_data->num_cong_events++ == 0) {
CCV(ccv, snd_ssthresh) =
- mss * max(cwin / 2 / mss, 2);
+ mss * max(win / 2 / mss, 2);
dctcp_data->alpha = MAX_ALPHA_VALUE;
dctcp_data->bytes_ecn = 0;
dctcp_data->bytes_total = 0;
dctcp_data->save_sndnxt = CCV(ccv, snd_nxt);
} else
- CCV(ccv, snd_ssthresh) = max((cwin - ((cwin *
+ CCV(ccv, snd_ssthresh) = max((win - ((win *
dctcp_data->alpha) >> 11)) / mss, 2) * mss;
CCV(ccv, snd_cwnd) = CCV(ccv, snd_ssthresh);
ENTER_CONGRECOVERY(CCV(ccv, t_flags));
@@ -285,8 +284,6 @@ dctcp_cong_signal(struct cc_var *ccv, uint32_t type)
dctcp_update_alpha(ccv);
dctcp_data->save_sndnxt += CCV(ccv, t_maxseg);
dctcp_data->num_cong_events++;
- CCV(ccv, snd_ssthresh) = max(2 * mss, cwin / 2);
- CCV(ccv, snd_cwnd) = mss;
}
break;
}
diff --git a/sys/netinet/cc/cc_htcp.c b/sys/netinet/cc/cc_htcp.c
index 8842648435c0..92820f56de8c 100644
--- a/sys/netinet/cc/cc_htcp.c
+++ b/sys/netinet/cc/cc_htcp.c
@@ -271,12 +271,8 @@ static void
htcp_cong_signal(struct cc_var *ccv, uint32_t type)
{
struct htcp *htcp_data;
- uint32_t cwin;
- u_int mss;
htcp_data = ccv->cc_data;
- cwin = CCV(ccv, snd_cwnd);
- mss = CCV(ccv, t_maxseg);
switch (type) {
case CC_NDUPACK:
@@ -291,9 +287,8 @@ htcp_cong_signal(struct cc_var *ccv, uint32_t type)
(htcp_data->maxrtt - htcp_data->minrtt) *
95) / 100;
htcp_ssthresh_update(ccv);
- CCV(ccv, snd_cwnd) = CCV(ccv, snd_ssthresh);
htcp_data->t_last_cong = ticks;
- htcp_data->prev_cwnd = cwin;
+ htcp_data->prev_cwnd = CCV(ccv, snd_cwnd);
}
ENTER_RECOVERY(CCV(ccv, t_flags));
}
@@ -310,7 +305,7 @@ htcp_cong_signal(struct cc_var *ccv, uint32_t type)
htcp_ssthresh_update(ccv);
CCV(ccv, snd_cwnd) = CCV(ccv, snd_ssthresh);
htcp_data->t_last_cong = ticks;
- htcp_data->prev_cwnd = cwin;
+ htcp_data->prev_cwnd = CCV(ccv, snd_cwnd);
ENTER_CONGRECOVERY(CCV(ccv, t_flags));
}
break;
@@ -325,8 +320,6 @@ htcp_cong_signal(struct cc_var *ccv, uint32_t type)
*/
if (CCV(ccv, t_rxtshift) >= 2)
htcp_data->t_last_cong = ticks;
- CCV(ccv, snd_ssthresh) = max(2 * mss, cwin / 2);
- CCV(ccv, snd_cwnd) = mss;
break;
}
}
diff --git a/sys/netinet/cc/cc_newreno.c b/sys/netinet/cc/cc_newreno.c
index 3aa16019657d..b2c72fe9fcb1 100644
--- a/sys/netinet/cc/cc_newreno.c
+++ b/sys/netinet/cc/cc_newreno.c
@@ -182,39 +182,30 @@ newreno_after_idle(struct cc_var *ccv)
static void
newreno_cong_signal(struct cc_var *ccv, uint32_t type)
{
- uint32_t cwin;
- u_int mss;
-
- cwin = CCV(ccv, snd_cwnd);
- mss = CCV(ccv, t_maxseg);
+ u_int win;
/* Catch algos which mistakenly leak private signal types. */
KASSERT((type & CC_SIGPRIVMASK) == 0,
("%s: congestion signal type 0x%08x is private\n", __func__, type));
- cwin = max(2*mss, cwin/2);
+ win = max(CCV(ccv, snd_cwnd) / 2 / CCV(ccv, t_maxseg), 2) *
+ CCV(ccv, t_maxseg);
switch (type) {
case CC_NDUPACK:
if (!IN_FASTRECOVERY(CCV(ccv, t_flags))) {
- if (!IN_CONGRECOVERY(CCV(ccv, t_flags))) {
- CCV(ccv, snd_ssthresh) = cwin;
- CCV(ccv, snd_cwnd) = cwin;
- }
+ if (!IN_CONGRECOVERY(CCV(ccv, t_flags)))
+ CCV(ccv, snd_ssthresh) = win;
ENTER_RECOVERY(CCV(ccv, t_flags));
}
break;
case CC_ECN:
if (!IN_CONGRECOVERY(CCV(ccv, t_flags))) {
- CCV(ccv, snd_ssthresh) = cwin;
- CCV(ccv, snd_cwnd) = cwin;
+ CCV(ccv, snd_ssthresh) = win;
+ CCV(ccv, snd_cwnd) = win;
ENTER_CONGRECOVERY(CCV(ccv, t_flags));
}
break;
- case CC_RTO:
- CCV(ccv, snd_ssthresh) = cwin;
- CCV(ccv, snd_cwnd) = mss;
- break;
}
}
diff --git a/sys/netinet/tcp_input.c b/sys/netinet/tcp_input.c
index 016003057192..b1c968e83f97 100644
--- a/sys/netinet/tcp_input.c
+++ b/sys/netinet/tcp_input.c
@@ -435,15 +435,9 @@ cc_cong_signal(struct tcpcb *tp, struct tcphdr *th, uint32_t type)
tp->t_dupacks = 0;
tp->t_bytes_acked = 0;
EXIT_RECOVERY(tp->t_flags);
- if (CC_ALGO(tp)->cong_signal == NULL) {
- /*
- * RFC5681 Section 3.1
- * ssthresh = max (FlightSize / 2, 2*SMSS) eq (4)
- */
- tp->snd_ssthresh =
- max((tp->snd_max - tp->snd_una) / 2, 2 * maxseg);
- tp->snd_cwnd = maxseg;
- }
+ tp->snd_ssthresh = max(2, min(tp->snd_wnd, tp->snd_cwnd) / 2 /
+ maxseg) * maxseg;
+ tp->snd_cwnd = maxseg;
break;
case CC_RTO_ERR:
TCPSTAT_INC(tcps_sndrexmitbad);
@@ -2612,15 +2606,6 @@ tcp_do_segment(struct mbuf *m, struct tcphdr *th, struct socket *so,
if (awnd < tp->snd_ssthresh) {
tp->snd_cwnd += maxseg;
- /*
- * RFC5681 Section 3.2 talks about cwnd
- * inflation on additional dupacks and
- * deflation on recovering from loss.
- *
- * We keep cwnd into check so that
- * we don't have to 'deflate' it when we
- * get out of recovery.
- */
if (tp->snd_cwnd > tp->snd_ssthresh)
tp->snd_cwnd = tp->snd_ssthresh;
}
@@ -2660,22 +2645,19 @@ tcp_do_segment(struct mbuf *m, struct tcphdr *th, struct socket *so,
TCPSTAT_INC(
tcps_sack_recovery_episode);
tp->sack_newdata = tp->snd_nxt;
- if (CC_ALGO(tp)->cong_signal == NULL)
- tp->snd_cwnd = maxseg;
+ tp->snd_cwnd = maxseg;
(void) tp->t_fb->tfb_tcp_output(tp);
goto drop;
}
tp->snd_nxt = th->th_ack;
- if (CC_ALGO(tp)->cong_signal == NULL)
- tp->snd_cwnd = maxseg;
+ tp->snd_cwnd = maxseg;
(void) tp->t_fb->tfb_tcp_output(tp);
KASSERT(tp->snd_limited <= 2,
("%s: tp->snd_limited too big",
__func__));
- if (CC_ALGO(tp)->cong_signal == NULL)
- tp->snd_cwnd = tp->snd_ssthresh +
- maxseg *
- (tp->t_dupacks - tp->snd_limited);
+ tp->snd_cwnd = tp->snd_ssthresh +
+ maxseg *
+ (tp->t_dupacks - tp->snd_limited);
if (SEQ_GT(onxt, tp->snd_nxt))
tp->snd_nxt = onxt;
goto drop;
diff --git a/sys/netinet/tcp_stacks/fastpath.c b/sys/netinet/tcp_stacks/fastpath.c
index fe903d46e40d..caad7538ccfc 100644
--- a/sys/netinet/tcp_stacks/fastpath.c
+++ b/sys/netinet/tcp_stacks/fastpath.c
@@ -1052,15 +1052,6 @@ tcp_do_slowpath(struct mbuf *m, struct tcphdr *th, struct socket *so,
if (awnd < tp->snd_ssthresh) {
tp->snd_cwnd += tp->t_maxseg;
- /*
- * RFC5681 Section 3.2 talks about cwnd
- * inflation on additional dupacks and
- * deflation on recovering from loss.
- *
- * We keep cwnd into check so that
- * we don't have to 'deflate' it when we
- * get out of recovery.
- */
if (tp->snd_cwnd > tp->snd_ssthresh)
tp->snd_cwnd = tp->snd_ssthresh;
}
@@ -1100,22 +1091,19 @@ tcp_do_slowpath(struct mbuf *m, struct tcphdr *th, struct socket *so,
TCPSTAT_INC(
tcps_sack_recovery_episode);
tp->sack_newdata = tp->snd_nxt;
- if (CC_ALGO(tp)->cong_signal == NULL)
- tp->snd_cwnd = tp->t_maxseg;
+ tp->snd_cwnd = tp->t_maxseg;
(void) tp->t_fb->tfb_tcp_output(tp);
goto drop;
}
tp->snd_nxt = th->th_ack;
- if (CC_ALGO(tp)->cong_signal == NULL)
- tp->snd_cwnd = tp->t_maxseg;
+ tp->snd_cwnd = tp->t_maxseg;
(void) tp->t_fb->tfb_tcp_output(tp);
KASSERT(tp->snd_limited <= 2,
("%s: tp->snd_limited too big",
__func__));
- if (CC_ALGO(tp)->cong_signal == NULL)
- tp->snd_cwnd = tp->snd_ssthresh +
- tp->t_maxseg *
- (tp->t_dupacks - tp->snd_limited);
+ tp->snd_cwnd = tp->snd_ssthresh +
+ tp->t_maxseg *
+ (tp->t_dupacks - tp->snd_limited);
if (SEQ_GT(onxt, tp->snd_nxt))
tp->snd_nxt = onxt;
goto drop;
generated by cgit v1.3 (git 2.53.0) at 2026-05-31 20:38:19 +0000