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tcp: add accessors to read/set tp->snd_cwnd

Browse Source 
We had various bugs over the years with code
breaking the assumption that tp->snd_cwnd is greater
than zero.

Lately, syzbot reported the WARN_ON_ONCE(!tp->prior_cwnd) added
in commit 8b8a321ff7 ("tcp: fix zero cwnd in tcp_cwnd_reduction")
can trigger, and without a repro we would have to spend
considerable time finding the bug.

Instead of complaining too late, we want to catch where
and when tp->snd_cwnd is set to an illegal value.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Suggested-by: Yuchung Cheng <ycheng@google.com>
Cc: Neal Cardwell <ncardwell@google.com>
Acked-by: Yuchung Cheng <ycheng@google.com>
Link: https://lore.kernel.org/r/20220405233538.947344-1-eric.dumazet@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet 2022-04-05 16:35:38 -07:00 committed by Jakub Kicinski
parent 487dc3ca60
commit 4057037535
27 changed files with 208 additions and 192 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
include/net/tcp.h
View File

@ -1207,9 +1207,20 @@ static inline unsigned int tcp_packets_in_flight(const struct tcp_sock *tp)
#define TCP_INFINITE_SSTHRESH 0x7fffffff
static inline u32 tcp_snd_cwnd(const struct tcp_sock *tp)
{
return tp->snd_cwnd;
}
static inline void tcp_snd_cwnd_set(struct tcp_sock *tp, u32 val)
{
WARN_ON_ONCE((int)val <= 0);
tp->snd_cwnd = val;
}
static inline bool tcp_in_slow_start(const struct tcp_sock *tp)
{
return tp->snd_cwnd < tp->snd_ssthresh;
return tcp_snd_cwnd(tp) < tp->snd_ssthresh;
}
static inline bool tcp_in_initial_slowstart(const struct tcp_sock *tp)
@ -1235,8 +1246,8 @@ static inline __u32 tcp_current_ssthresh(const struct sock *sk)
return tp->snd_ssthresh;
else
return max(tp->snd_ssthresh,
((tp->snd_cwnd >> 1) +
(tp->snd_cwnd >> 2)));
((tcp_snd_cwnd(tp) >> 1) +
(tcp_snd_cwnd(tp) >> 2)));
}
/* Use define here intentionally to get WARN_ON location shown at the caller */
@ -1278,7 +1289,7 @@ static inline bool tcp_is_cwnd_limited(const struct sock *sk)
/* If in slow start, ensure cwnd grows to twice what was ACKed. */
if (tcp_in_slow_start(tp))
return tp->snd_cwnd < 2 * tp->max_packets_out;
return tcp_snd_cwnd(tp) < 2 * tp->max_packets_out;
return tp->is_cwnd_limited;
}

2
include/trace/events/tcp.h
View File

@ -279,7 +279,7 @@ TRACE_EVENT(tcp_probe,
__entry->data_len = skb->len - __tcp_hdrlen(th);
__entry->snd_nxt = tp->snd_nxt;
__entry->snd_una = tp->snd_una;
__entry->snd_cwnd = tp->snd_cwnd;
__entry->snd_cwnd = tcp_snd_cwnd(tp);
__entry->snd_wnd = tp->snd_wnd;
__entry->rcv_wnd = tp->rcv_wnd;
__entry->ssthresh = tcp_current_ssthresh(sk);

2
net/core/filter.c
View File

@ -5173,7 +5173,7 @@ static int _bpf_setsockopt(struct sock *sk, int level, int optname,
if (val <= 0 || tp->data_segs_out > tp->syn_data)
ret = -EINVAL;
else
tp->snd_cwnd = val;
tcp_snd_cwnd_set(tp, val);
break;
case TCP_BPF_SNDCWND_CLAMP:
if (val <= 0) {

8
net/ipv4/tcp.c
View File

@ -429,7 +429,7 @@ void tcp_init_sock(struct sock *sk)
* algorithms that we must have the following bandaid to talk
* efficiently to them. -DaveM
*/
tp->snd_cwnd = TCP_INIT_CWND;
tcp_snd_cwnd_set(tp, TCP_INIT_CWND);
/* There's a bubble in the pipe until at least the first ACK. */
tp->app_limited = ~0U;
@ -3033,7 +3033,7 @@ int tcp_disconnect(struct sock *sk, int flags)
icsk->icsk_rto_min = TCP_RTO_MIN;
icsk->icsk_delack_max = TCP_DELACK_MAX;
tp->snd_ssthresh = TCP_INFINITE_SSTHRESH;
tp->snd_cwnd = TCP_INIT_CWND;
tcp_snd_cwnd_set(tp, TCP_INIT_CWND);
tp->snd_cwnd_cnt = 0;
tp->window_clamp = 0;
tp->delivered = 0;
@ -3744,7 +3744,7 @@ void tcp_get_info(struct sock *sk, struct tcp_info *info)
info->tcpi_max_pacing_rate = rate64;
info->tcpi_reordering = tp->reordering;
info->tcpi_snd_cwnd = tp->snd_cwnd;
info->tcpi_snd_cwnd = tcp_snd_cwnd(tp);
if (info->tcpi_state == TCP_LISTEN) {
/* listeners aliased fields :
@ -3915,7 +3915,7 @@ struct sk_buff *tcp_get_timestamping_opt_stats(const struct sock *sk,
rate64 = tcp_compute_delivery_rate(tp);
nla_put_u64_64bit(stats, TCP_NLA_DELIVERY_RATE, rate64, TCP_NLA_PAD);
nla_put_u32(stats, TCP_NLA_SND_CWND, tp->snd_cwnd);
nla_put_u32(stats, TCP_NLA_SND_CWND, tcp_snd_cwnd(tp));
nla_put_u32(stats, TCP_NLA_REORDERING, tp->reordering);
nla_put_u32(stats, TCP_NLA_MIN_RTT, tcp_min_rtt(tp));

20
net/ipv4/tcp_bbr.c
View File

@ -276,7 +276,7 @@ static void bbr_init_pacing_rate_from_rtt(struct sock *sk)
} else { /* no RTT sample yet */
rtt_us = USEC_PER_MSEC; /* use nominal default RTT */
}
bw = (u64)tp->snd_cwnd * BW_UNIT;
bw = (u64)tcp_snd_cwnd(tp) * BW_UNIT;
do_div(bw, rtt_us);
sk->sk_pacing_rate = bbr_bw_to_pacing_rate(sk, bw, bbr_high_gain);
}
@ -323,9 +323,9 @@ static void bbr_save_cwnd(struct sock *sk)
struct bbr *bbr = inet_csk_ca(sk);
if (bbr->prev_ca_state < TCP_CA_Recovery && bbr->mode != BBR_PROBE_RTT)
bbr->prior_cwnd = tp->snd_cwnd; /* this cwnd is good enough */
bbr->prior_cwnd = tcp_snd_cwnd(tp); /* this cwnd is good enough */
else /* loss recovery or BBR_PROBE_RTT have temporarily cut cwnd */
bbr->prior_cwnd = max(bbr->prior_cwnd, tp->snd_cwnd);
bbr->prior_cwnd = max(bbr->prior_cwnd, tcp_snd_cwnd(tp));
}
static void bbr_cwnd_event(struct sock *sk, enum tcp_ca_event event)
@ -482,7 +482,7 @@ static bool bbr_set_cwnd_to_recover_or_restore(
struct tcp_sock *tp = tcp_sk(sk);
struct bbr *bbr = inet_csk_ca(sk);
u8 prev_state = bbr->prev_ca_state, state = inet_csk(sk)->icsk_ca_state;
u32 cwnd = tp->snd_cwnd;
u32 cwnd = tcp_snd_cwnd(tp);
/* An ACK for P pkts should release at most 2*P packets. We do this
* in two steps. First, here we deduct the number of lost packets.
@ -520,7 +520,7 @@ static void bbr_set_cwnd(struct sock *sk, const struct rate_sample *rs,
{
struct tcp_sock *tp = tcp_sk(sk);
struct bbr *bbr = inet_csk_ca(sk);
u32 cwnd = tp->snd_cwnd, target_cwnd = 0;
u32 cwnd = tcp_snd_cwnd(tp), target_cwnd = 0;
if (!acked)
goto done; /* no packet fully ACKed; just apply caps */
@ -544,9 +544,9 @@ static void bbr_set_cwnd(struct sock *sk, const struct rate_sample *rs,
cwnd = max(cwnd, bbr_cwnd_min_target);
done:
tp->snd_cwnd = min(cwnd, tp->snd_cwnd_clamp); /* apply global cap */
tcp_snd_cwnd_set(tp, min(cwnd, tp->snd_cwnd_clamp)); /* apply global cap */
if (bbr->mode == BBR_PROBE_RTT) /* drain queue, refresh min_rtt */
tp->snd_cwnd = min(tp->snd_cwnd, bbr_cwnd_min_target);
tcp_snd_cwnd_set(tp, min(tcp_snd_cwnd(tp), bbr_cwnd_min_target));
}
/* End cycle phase if it's time and/or we hit the phase's in-flight target. */
@ -856,7 +856,7 @@ static void bbr_update_ack_aggregation(struct sock *sk,
bbr->ack_epoch_acked = min_t(u32, 0xFFFFF,
bbr->ack_epoch_acked + rs->acked_sacked);
extra_acked = bbr->ack_epoch_acked - expected_acked;
extra_acked = min(extra_acked, tp->snd_cwnd);
extra_acked = min(extra_acked, tcp_snd_cwnd(tp));
if (extra_acked > bbr->extra_acked[bbr->extra_acked_win_idx])
bbr->extra_acked[bbr->extra_acked_win_idx] = extra_acked;
}
@ -914,7 +914,7 @@ static void bbr_check_probe_rtt_done(struct sock *sk)
return;
bbr->min_rtt_stamp = tcp_jiffies32; /* wait a while until PROBE_RTT */
tp->snd_cwnd = max(tp->snd_cwnd, bbr->prior_cwnd);
tcp_snd_cwnd_set(tp, max(tcp_snd_cwnd(tp), bbr->prior_cwnd));
bbr_reset_mode(sk);
}
@ -1093,7 +1093,7 @@ static u32 bbr_undo_cwnd(struct sock *sk)
bbr->full_bw = 0; /* spurious slow-down; reset full pipe detection */
bbr->full_bw_cnt = 0;
bbr_reset_lt_bw_sampling(sk);
return tcp_sk(sk)->snd_cwnd;
return tcp_snd_cwnd(tcp_sk(sk));
}
/* Entering loss recovery, so save cwnd for when we exit or undo recovery. */

14
net/ipv4/tcp_bic.c
View File

@ -150,7 +150,7 @@ static void bictcp_cong_avoid(struct sock *sk, u32 ack, u32 acked)
if (!acked)
return;
}
bictcp_update(ca, tp->snd_cwnd);
bictcp_update(ca, tcp_snd_cwnd(tp));
tcp_cong_avoid_ai(tp, ca->cnt, acked);
}
@ -166,16 +166,16 @@ static u32 bictcp_recalc_ssthresh(struct sock *sk)
ca->epoch_start = 0; /* end of epoch */
/* Wmax and fast convergence */
if (tp->snd_cwnd < ca->last_max_cwnd && fast_convergence)
ca->last_max_cwnd = (tp->snd_cwnd * (BICTCP_BETA_SCALE + beta))
if (tcp_snd_cwnd(tp) < ca->last_max_cwnd && fast_convergence)
ca->last_max_cwnd = (tcp_snd_cwnd(tp) * (BICTCP_BETA_SCALE + beta))
/ (2 * BICTCP_BETA_SCALE);
else
ca->last_max_cwnd = tp->snd_cwnd;
ca->last_max_cwnd = tcp_snd_cwnd(tp);
if (tp->snd_cwnd <= low_window)
return max(tp->snd_cwnd >> 1U, 2U);
if (tcp_snd_cwnd(tp) <= low_window)
return max(tcp_snd_cwnd(tp) >> 1U, 2U);
else
return max((tp->snd_cwnd * beta) / BICTCP_BETA_SCALE, 2U);
return max((tcp_snd_cwnd(tp) * beta) / BICTCP_BETA_SCALE, 2U);
}
static void bictcp_state(struct sock *sk, u8 new_state)

30
net/ipv4/tcp_cdg.c
View File

@ -161,8 +161,8 @@ static void tcp_cdg_hystart_update(struct sock *sk)
LINUX_MIB_TCPHYSTARTTRAINDETECT);
NET_ADD_STATS(sock_net(sk),
LINUX_MIB_TCPHYSTARTTRAINCWND,
tp->snd_cwnd);
tp->snd_ssthresh = tp->snd_cwnd;
tcp_snd_cwnd(tp));
tp->snd_ssthresh = tcp_snd_cwnd(tp);
return;
}
}
@ -180,8 +180,8 @@ static void tcp_cdg_hystart_update(struct sock *sk)
LINUX_MIB_TCPHYSTARTDELAYDETECT);
NET_ADD_STATS(sock_net(sk),
LINUX_MIB_TCPHYSTARTDELAYCWND,
tp->snd_cwnd);
tp->snd_ssthresh = tp->snd_cwnd;
tcp_snd_cwnd(tp));
tp->snd_ssthresh = tcp_snd_cwnd(tp);
}
}
}
@ -252,7 +252,7 @@ static bool tcp_cdg_backoff(struct sock *sk, u32 grad)
return false;
}
ca->shadow_wnd = max(ca->shadow_wnd, tp->snd_cwnd);
ca->shadow_wnd = max(ca->shadow_wnd, tcp_snd_cwnd(tp));
ca->state = CDG_BACKOFF;
tcp_enter_cwr(sk);
return true;
@ -285,14 +285,14 @@ static void tcp_cdg_cong_avoid(struct sock *sk, u32 ack, u32 acked)
}
if (!tcp_is_cwnd_limited(sk)) {
ca->shadow_wnd = min(ca->shadow_wnd, tp->snd_cwnd);
ca->shadow_wnd = min(ca->shadow_wnd, tcp_snd_cwnd(tp));
return;
}
prior_snd_cwnd = tp->snd_cwnd;
prior_snd_cwnd = tcp_snd_cwnd(tp);
tcp_reno_cong_avoid(sk, ack, acked);
incr = tp->snd_cwnd - prior_snd_cwnd;
incr = tcp_snd_cwnd(tp) - prior_snd_cwnd;
ca->shadow_wnd = max(ca->shadow_wnd, ca->shadow_wnd + incr);
}
@ -331,15 +331,15 @@ static u32 tcp_cdg_ssthresh(struct sock *sk)
struct tcp_sock *tp = tcp_sk(sk);
if (ca->state == CDG_BACKOFF)
return max(2U, (tp->snd_cwnd * min(1024U, backoff_beta)) >> 10);
return max(2U, (tcp_snd_cwnd(tp) * min(1024U, backoff_beta)) >> 10);
if (ca->state == CDG_NONFULL && use_tolerance)
return tp->snd_cwnd;
return tcp_snd_cwnd(tp);
ca->shadow_wnd = min(ca->shadow_wnd >> 1, tp->snd_cwnd);
ca->shadow_wnd = min(ca->shadow_wnd >> 1, tcp_snd_cwnd(tp));
if (use_shadow)
return max3(2U, ca->shadow_wnd, tp->snd_cwnd >> 1);
return max(2U, tp->snd_cwnd >> 1);
return max3(2U, ca->shadow_wnd, tcp_snd_cwnd(tp) >> 1);
return max(2U, tcp_snd_cwnd(tp) >> 1);
}
static void tcp_cdg_cwnd_event(struct sock *sk, const enum tcp_ca_event ev)
@ -357,7 +357,7 @@ static void tcp_cdg_cwnd_event(struct sock *sk, const enum tcp_ca_event ev)
ca->gradients = gradients;
ca->rtt_seq = tp->snd_nxt;
ca->shadow_wnd = tp->snd_cwnd;
ca->shadow_wnd = tcp_snd_cwnd(tp);
break;
case CA_EVENT_COMPLETE_CWR:
ca->state = CDG_UNKNOWN;
@ -380,7 +380,7 @@ static void tcp_cdg_init(struct sock *sk)
ca->gradients = kcalloc(window, sizeof(ca->gradients[0]),
GFP_NOWAIT | __GFP_NOWARN);
ca->rtt_seq = tp->snd_nxt;
ca->shadow_wnd = tp->snd_cwnd;
ca->shadow_wnd = tcp_snd_cwnd(tp);
}
static void tcp_cdg_release(struct sock *sk)

18
net/ipv4/tcp_cong.c
View File

@ -393,10 +393,10 @@ int tcp_set_congestion_control(struct sock *sk, const char *name, bool load,
*/
u32 tcp_slow_start(struct tcp_sock *tp, u32 acked)
{
u32 cwnd = min(tp->snd_cwnd + acked, tp->snd_ssthresh);
u32 cwnd = min(tcp_snd_cwnd(tp) + acked, tp->snd_ssthresh);
acked -= cwnd - tp->snd_cwnd;
tp->snd_cwnd = min(cwnd, tp->snd_cwnd_clamp);
acked -= cwnd - tcp_snd_cwnd(tp);
tcp_snd_cwnd_set(tp, min(cwnd, tp->snd_cwnd_clamp));
return acked;
}
@ -410,7 +410,7 @@ void tcp_cong_avoid_ai(struct tcp_sock *tp, u32 w, u32 acked)
/* If credits accumulated at a higher w, apply them gently now. */
if (tp->snd_cwnd_cnt >= w) {
tp->snd_cwnd_cnt = 0;
tp->snd_cwnd++;
tcp_snd_cwnd_set(tp, tcp_snd_cwnd(tp) + 1);
}
tp->snd_cwnd_cnt += acked;
@ -418,9 +418,9 @@ void tcp_cong_avoid_ai(struct tcp_sock *tp, u32 w, u32 acked)
u32 delta = tp->snd_cwnd_cnt / w;
tp->snd_cwnd_cnt -= delta * w;
tp->snd_cwnd += delta;
tcp_snd_cwnd_set(tp, tcp_snd_cwnd(tp) + delta);
}
tp->snd_cwnd = min(tp->snd_cwnd, tp->snd_cwnd_clamp);
tcp_snd_cwnd_set(tp, min(tcp_snd_cwnd(tp), tp->snd_cwnd_clamp));
}
EXPORT_SYMBOL_GPL(tcp_cong_avoid_ai);
@ -445,7 +445,7 @@ void tcp_reno_cong_avoid(struct sock *sk, u32 ack, u32 acked)
return;
}
/* In dangerous area, increase slowly. */
tcp_cong_avoid_ai(tp, tp->snd_cwnd, acked);
tcp_cong_avoid_ai(tp, tcp_snd_cwnd(tp), acked);
}
EXPORT_SYMBOL_GPL(tcp_reno_cong_avoid);
@ -454,7 +454,7 @@ u32 tcp_reno_ssthresh(struct sock *sk)
{
const struct tcp_sock *tp = tcp_sk(sk);
return max(tp->snd_cwnd >> 1U, 2U);
return max(tcp_snd_cwnd(tp) >> 1U, 2U);
}
EXPORT_SYMBOL_GPL(tcp_reno_ssthresh);
@ -462,7 +462,7 @@ u32 tcp_reno_undo_cwnd(struct sock *sk)
{
const struct tcp_sock *tp = tcp_sk(sk);
return max(tp->snd_cwnd, tp->prior_cwnd);
return max(tcp_snd_cwnd(tp), tp->prior_cwnd);
}
EXPORT_SYMBOL_GPL(tcp_reno_undo_cwnd);

22
net/ipv4/tcp_cubic.c
View File

@ -334,7 +334,7 @@ static void cubictcp_cong_avoid(struct sock *sk, u32 ack, u32 acked)
if (!acked)
return;
}
bictcp_update(ca, tp->snd_cwnd, acked);
bictcp_update(ca, tcp_snd_cwnd(tp), acked);
tcp_cong_avoid_ai(tp, ca->cnt, acked);
}
@ -346,13 +346,13 @@ static u32 cubictcp_recalc_ssthresh(struct sock *sk)
ca->epoch_start = 0; /* end of epoch */
/* Wmax and fast convergence */
if (tp->snd_cwnd < ca->last_max_cwnd && fast_convergence)
ca->last_max_cwnd = (tp->snd_cwnd * (BICTCP_BETA_SCALE + beta))
if (tcp_snd_cwnd(tp) < ca->last_max_cwnd && fast_convergence)
ca->last_max_cwnd = (tcp_snd_cwnd(tp) * (BICTCP_BETA_SCALE + beta))
/ (2 * BICTCP_BETA_SCALE);
else
ca->last_max_cwnd = tp->snd_cwnd;
ca->last_max_cwnd = tcp_snd_cwnd(tp);
return max((tp->snd_cwnd * beta) / BICTCP_BETA_SCALE, 2U);
return max((tcp_snd_cwnd(tp) * beta) / BICTCP_BETA_SCALE, 2U);
}
static void cubictcp_state(struct sock *sk, u8 new_state)
@ -413,13 +413,13 @@ static void hystart_update(struct sock *sk, u32 delay)
ca->found = 1;
pr_debug("hystart_ack_train (%u > %u) delay_min %u (+ ack_delay %u) cwnd %u\n",
now - ca->round_start, threshold,
ca->delay_min, hystart_ack_delay(sk), tp->snd_cwnd);
ca->delay_min, hystart_ack_delay(sk), tcp_snd_cwnd(tp));
NET_INC_STATS(sock_net(sk),
LINUX_MIB_TCPHYSTARTTRAINDETECT);
NET_ADD_STATS(sock_net(sk),
LINUX_MIB_TCPHYSTARTTRAINCWND,
tp->snd_cwnd);
tp->snd_ssthresh = tp->snd_cwnd;
tcp_snd_cwnd(tp));
tp->snd_ssthresh = tcp_snd_cwnd(tp);
}
}
}
@ -438,8 +438,8 @@ static void hystart_update(struct sock *sk, u32 delay)
LINUX_MIB_TCPHYSTARTDELAYDETECT);
NET_ADD_STATS(sock_net(sk),
LINUX_MIB_TCPHYSTARTDELAYCWND,
tp->snd_cwnd);
tp->snd_ssthresh = tp->snd_cwnd;
tcp_snd_cwnd(tp));
tp->snd_ssthresh = tcp_snd_cwnd(tp);
}
}
}
@ -469,7 +469,7 @@ static void cubictcp_acked(struct sock *sk, const struct ack_sample *sample)
/* hystart triggers when cwnd is larger than some threshold */
if (!ca->found && tcp_in_slow_start(tp) && hystart &&
tp->snd_cwnd >= hystart_low_window)
tcp_snd_cwnd(tp) >= hystart_low_window)
hystart_update(sk, delay);
}

11
net/ipv4/tcp_dctcp.c
View File

@ -106,8 +106,8 @@ static u32 dctcp_ssthresh(struct sock *sk)
struct dctcp *ca = inet_csk_ca(sk);
struct tcp_sock *tp = tcp_sk(sk);
ca->loss_cwnd = tp->snd_cwnd;
return max(tp->snd_cwnd - ((tp->snd_cwnd * ca->dctcp_alpha) >> 11U), 2U);
ca->loss_cwnd = tcp_snd_cwnd(tp);
return max(tcp_snd_cwnd(tp) - ((tcp_snd_cwnd(tp) * ca->dctcp_alpha) >> 11U), 2U);
}
static void dctcp_update_alpha(struct sock *sk, u32 flags)
@ -148,8 +148,8 @@ static void dctcp_react_to_loss(struct sock *sk)
struct dctcp *ca = inet_csk_ca(sk);
struct tcp_sock *tp = tcp_sk(sk);
ca->loss_cwnd = tp->snd_cwnd;
tp->snd_ssthresh = max(tp->snd_cwnd >> 1U, 2U);
ca->loss_cwnd = tcp_snd_cwnd(tp);
tp->snd_ssthresh = max(tcp_snd_cwnd(tp) >> 1U, 2U);
}
static void dctcp_state(struct sock *sk, u8 new_state)
@ -211,8 +211,9 @@ static size_t dctcp_get_info(struct sock *sk, u32 ext, int *attr,
static u32 dctcp_cwnd_undo(struct sock *sk)
{
const struct dctcp *ca = inet_csk_ca(sk);
struct tcp_sock *tp = tcp_sk(sk);
return max(tcp_sk(sk)->snd_cwnd, ca->loss_cwnd);
return max(tcp_snd_cwnd(tp), ca->loss_cwnd);
}
static struct tcp_congestion_ops dctcp __read_mostly = {

18
net/ipv4/tcp_highspeed.c
View File

@ -127,22 +127,22 @@ static void hstcp_cong_avoid(struct sock *sk, u32 ack, u32 acked)
* snd_cwnd <=
* hstcp_aimd_vals[ca->ai].cwnd
*/
if (tp->snd_cwnd > hstcp_aimd_vals[ca->ai].cwnd) {
while (tp->snd_cwnd > hstcp_aimd_vals[ca->ai].cwnd &&
if (tcp_snd_cwnd(tp) > hstcp_aimd_vals[ca->ai].cwnd) {
while (tcp_snd_cwnd(tp) > hstcp_aimd_vals[ca->ai].cwnd &&
ca->ai < HSTCP_AIMD_MAX - 1)
ca->ai++;
} else if (ca->ai && tp->snd_cwnd <= hstcp_aimd_vals[ca->ai-1].cwnd) {
while (ca->ai && tp->snd_cwnd <= hstcp_aimd_vals[ca->ai-1].cwnd)
} else if (ca->ai && tcp_snd_cwnd(tp) <= hstcp_aimd_vals[ca->ai-1].cwnd) {
while (ca->ai && tcp_snd_cwnd(tp) <= hstcp_aimd_vals[ca->ai-1].cwnd)
ca->ai--;
}
/* Do additive increase */
if (tp->snd_cwnd < tp->snd_cwnd_clamp) {
if (tcp_snd_cwnd(tp) < tp->snd_cwnd_clamp) {
/* cwnd = cwnd + a(w) / cwnd */
tp->snd_cwnd_cnt += ca->ai + 1;
if (tp->snd_cwnd_cnt >= tp->snd_cwnd) {
tp->snd_cwnd_cnt -= tp->snd_cwnd;
tp->snd_cwnd++;
if (tp->snd_cwnd_cnt >= tcp_snd_cwnd(tp)) {
tp->snd_cwnd_cnt -= tcp_snd_cwnd(tp);
tcp_snd_cwnd_set(tp, tcp_snd_cwnd(tp) + 1);
}
}
}
@ -154,7 +154,7 @@ static u32 hstcp_ssthresh(struct sock *sk)
struct hstcp *ca = inet_csk_ca(sk);
/* Do multiplicative decrease */
return max(tp->snd_cwnd - ((tp->snd_cwnd * hstcp_aimd_vals[ca->ai].md) >> 8), 2U);
return max(tcp_snd_cwnd(tp) - ((tcp_snd_cwnd(tp) * hstcp_aimd_vals[ca->ai].md) >> 8), 2U);
}
static struct tcp_congestion_ops tcp_highspeed __read_mostly = {

10
net/ipv4/tcp_htcp.c
View File

@ -124,7 +124,7 @@ static void measure_achieved_throughput(struct sock *sk,
ca->packetcount += sample->pkts_acked;
if (ca->packetcount >= tp->snd_cwnd - (ca->alpha >> 7 ? : 1) &&
if (ca->packetcount >= tcp_snd_cwnd(tp) - (ca->alpha >> 7 ? : 1) &&
now - ca->lasttime >= ca->minRTT &&
ca->minRTT > 0) {
__u32 cur_Bi = ca->packetcount * HZ / (now - ca->lasttime);
@ -225,7 +225,7 @@ static u32 htcp_recalc_ssthresh(struct sock *sk)
const struct htcp *ca = inet_csk_ca(sk);
htcp_param_update(sk);
return max((tp->snd_cwnd * ca->beta) >> 7, 2U);
return max((tcp_snd_cwnd(tp) * ca->beta) >> 7, 2U);
}
static void htcp_cong_avoid(struct sock *sk, u32 ack, u32 acked)
@ -242,9 +242,9 @@ static void htcp_cong_avoid(struct sock *sk, u32 ack, u32 acked)
/* In dangerous area, increase slowly.
* In theory this is tp->snd_cwnd += alpha / tp->snd_cwnd
*/
if ((tp->snd_cwnd_cnt * ca->alpha)>>7 >= tp->snd_cwnd) {
if (tp->snd_cwnd < tp->snd_cwnd_clamp)
tp->snd_cwnd++;
if ((tp->snd_cwnd_cnt * ca->alpha)>>7 >= tcp_snd_cwnd(tp)) {
if (tcp_snd_cwnd(tp) < tp->snd_cwnd_clamp)
tcp_snd_cwnd_set(tp, tcp_snd_cwnd(tp) + 1);
tp->snd_cwnd_cnt = 0;
htcp_alpha_update(ca);
} else

18
net/ipv4/tcp_hybla.c
View File

@ -54,7 +54,7 @@ static void hybla_init(struct sock *sk)
ca->rho2_7ls = 0;
ca->snd_cwnd_cents = 0;
ca->hybla_en = true;
tp->snd_cwnd = 2;
tcp_snd_cwnd_set(tp, 2);
tp->snd_cwnd_clamp = 65535;
/* 1st Rho measurement based on initial srtt */
@ -62,7 +62,7 @@ static void hybla_init(struct sock *sk)
/* set minimum rtt as this is the 1st ever seen */
ca->minrtt_us = tp->srtt_us;
tp->snd_cwnd = ca->rho;
tcp_snd_cwnd_set(tp, ca->rho);
}
static void hybla_state(struct sock *sk, u8 ca_state)
@ -137,31 +137,31 @@ static void hybla_cong_avoid(struct sock *sk, u32 ack, u32 acked)
* as long as increment is estimated as (rho<<7)/window
* it already is <<7 and we can easily count its fractions.
*/
increment = ca->rho2_7ls / tp->snd_cwnd;
increment = ca->rho2_7ls / tcp_snd_cwnd(tp);
if (increment < 128)
tp->snd_cwnd_cnt++;
}
odd = increment % 128;
tp->snd_cwnd += increment >> 7;
tcp_snd_cwnd_set(tp, tcp_snd_cwnd(tp) + (increment >> 7));
ca->snd_cwnd_cents += odd;
/* check when fractions goes >=128 and increase cwnd by 1. */
while (ca->snd_cwnd_cents >= 128) {
tp->snd_cwnd++;
tcp_snd_cwnd_set(tp, tcp_snd_cwnd(tp) + 1);
ca->snd_cwnd_cents -= 128;
tp->snd_cwnd_cnt = 0;
}
/* check when cwnd has not been incremented for a while */
if (increment == 0 && odd == 0 && tp->snd_cwnd_cnt >= tp->snd_cwnd) {
tp->snd_cwnd++;
if (increment == 0 && odd == 0 && tp->snd_cwnd_cnt >= tcp_snd_cwnd(tp)) {
tcp_snd_cwnd_set(tp, tcp_snd_cwnd(tp) + 1);
tp->snd_cwnd_cnt = 0;
}
/* clamp down slowstart cwnd to ssthresh value. */
if (is_slowstart)
tp->snd_cwnd = min(tp->snd_cwnd, tp->snd_ssthresh);
tcp_snd_cwnd_set(tp, min(tcp_snd_cwnd(tp), tp->snd_ssthresh));
tp->snd_cwnd = min_t(u32, tp->snd_cwnd, tp->snd_cwnd_clamp);
tcp_snd_cwnd_set(tp, min(tcp_snd_cwnd(tp), tp->snd_cwnd_clamp));
}
static struct tcp_congestion_ops tcp_hybla __read_mostly = {

12
net/ipv4/tcp_illinois.c
View File

@ -224,7 +224,7 @@ static void update_params(struct sock *sk)
struct tcp_sock *tp = tcp_sk(sk);
struct illinois *ca = inet_csk_ca(sk);
if (tp->snd_cwnd < win_thresh) {
if (tcp_snd_cwnd(tp) < win_thresh) {
ca->alpha = ALPHA_BASE;
ca->beta = BETA_BASE;
} else if (ca->cnt_rtt > 0) {
@ -284,9 +284,9 @@ static void tcp_illinois_cong_avoid(struct sock *sk, u32 ack, u32 acked)
* tp->snd_cwnd += alpha/tp->snd_cwnd
*/
delta = (tp->snd_cwnd_cnt * ca->alpha) >> ALPHA_SHIFT;
if (delta >= tp->snd_cwnd) {
tp->snd_cwnd = min(tp->snd_cwnd + delta / tp->snd_cwnd,
(u32)tp->snd_cwnd_clamp);
if (delta >= tcp_snd_cwnd(tp)) {
tcp_snd_cwnd_set(tp, min(tcp_snd_cwnd(tp) + delta / tcp_snd_cwnd(tp),
(u32)tp->snd_cwnd_clamp));
tp->snd_cwnd_cnt = 0;
}
}
@ -296,9 +296,11 @@ static u32 tcp_illinois_ssthresh(struct sock *sk)
{
struct tcp_sock *tp = tcp_sk(sk);
struct illinois *ca = inet_csk_ca(sk);
u32 decr;
/* Multiplicative decrease */
return max(tp->snd_cwnd - ((tp->snd_cwnd * ca->beta) >> BETA_SHIFT), 2U);
decr = (tcp_snd_cwnd(tp) * ca->beta) >> BETA_SHIFT;
return max(tcp_snd_cwnd(tp) - decr, 2U);
}
/* Extract info for Tcp socket info provided via netlink. */

36
net/ipv4/tcp_input.c
View File

@ -414,7 +414,7 @@ static void tcp_sndbuf_expand(struct sock *sk)
per_mss = roundup_pow_of_two(per_mss) +
SKB_DATA_ALIGN(sizeof(struct sk_buff));
nr_segs = max_t(u32, TCP_INIT_CWND, tp->snd_cwnd);
nr_segs = max_t(u32, TCP_INIT_CWND, tcp_snd_cwnd(tp));
nr_segs = max_t(u32, nr_segs, tp->reordering + 1);
/* Fast Recovery (RFC 5681 3.2) :
@ -909,12 +909,12 @@ static void tcp_update_pacing_rate(struct sock *sk)
* If snd_cwnd >= (tp->snd_ssthresh / 2), we are approaching
* end of slow start and should slow down.
*/
if (tp->snd_cwnd < tp->snd_ssthresh / 2)
if (tcp_snd_cwnd(tp) < tp->snd_ssthresh / 2)
rate *= sock_net(sk)->ipv4.sysctl_tcp_pacing_ss_ratio;
else
rate *= sock_net(sk)->ipv4.sysctl_tcp_pacing_ca_ratio;
rate *= max(tp->snd_cwnd, tp->packets_out);
rate *= max(tcp_snd_cwnd(tp), tp->packets_out);
if (likely(tp->srtt_us))
do_div(rate, tp->srtt_us);
@ -2147,12 +2147,12 @@ void tcp_enter_loss(struct sock *sk)
!after(tp->high_seq, tp->snd_una) ||
(icsk->icsk_ca_state == TCP_CA_Loss && !icsk->icsk_retransmits)) {
tp->prior_ssthresh = tcp_current_ssthresh(sk);
tp->prior_cwnd = tp->snd_cwnd;
tp->prior_cwnd = tcp_snd_cwnd(tp);
tp->snd_ssthresh = icsk->icsk_ca_ops->ssthresh(sk);
tcp_ca_event(sk, CA_EVENT_LOSS);
tcp_init_undo(tp);
}
tp->snd_cwnd = tcp_packets_in_flight(tp) + 1;
tcp_snd_cwnd_set(tp, tcp_packets_in_flight(tp) + 1);
tp->snd_cwnd_cnt = 0;
tp->snd_cwnd_stamp = tcp_jiffies32;
@ -2458,7 +2458,7 @@ static void DBGUNDO(struct sock *sk, const char *msg)
pr_debug("Undo %s %pI4/%u c%u l%u ss%u/%u p%u\n",
msg,
&inet->inet_daddr, ntohs(inet->inet_dport),
tp->snd_cwnd, tcp_left_out(tp),
tcp_snd_cwnd(tp), tcp_left_out(tp),
tp->snd_ssthresh, tp->prior_ssthresh,
tp->packets_out);
}
@ -2467,7 +2467,7 @@ static void DBGUNDO(struct sock *sk, const char *msg)
pr_debug("Undo %s %pI6/%u c%u l%u ss%u/%u p%u\n",
msg,
&sk->sk_v6_daddr, ntohs(inet->inet_dport),
tp->snd_cwnd, tcp_left_out(tp),
tcp_snd_cwnd(tp), tcp_left_out(tp),
tp->snd_ssthresh, tp->prior_ssthresh,
tp->packets_out);
}
@ -2492,7 +2492,7 @@ static void tcp_undo_cwnd_reduction(struct sock *sk, bool unmark_loss)
if (tp->prior_ssthresh) {
const struct inet_connection_sock *icsk = inet_csk(sk);
tp->snd_cwnd = icsk->icsk_ca_ops->undo_cwnd(sk);
tcp_snd_cwnd_set(tp, icsk->icsk_ca_ops->undo_cwnd(sk));
if (tp->prior_ssthresh > tp->snd_ssthresh) {
tp->snd_ssthresh = tp->prior_ssthresh;
@ -2599,7 +2599,7 @@ static void tcp_init_cwnd_reduction(struct sock *sk)
tp->high_seq = tp->snd_nxt;
tp->tlp_high_seq = 0;
tp->snd_cwnd_cnt = 0;
tp->prior_cwnd = tp->snd_cwnd;
tp->prior_cwnd = tcp_snd_cwnd(tp);
tp->prr_delivered = 0;
tp->prr_out = 0;
tp->snd_ssthresh = inet_csk(sk)->icsk_ca_ops->ssthresh(sk);
@ -2629,7 +2629,7 @@ void tcp_cwnd_reduction(struct sock *sk, int newly_acked_sacked, int newly_lost,
}
/* Force a fast retransmit upon entering fast recovery */
sndcnt = max(sndcnt, (tp->prr_out ? 0 : 1));
tp->snd_cwnd = tcp_packets_in_flight(tp) + sndcnt;
tcp_snd_cwnd_set(tp, tcp_packets_in_flight(tp) + sndcnt);
}
static inline void tcp_end_cwnd_reduction(struct sock *sk)
@ -2642,7 +2642,7 @@ static inline void tcp_end_cwnd_reduction(struct sock *sk)
/* Reset cwnd to ssthresh in CWR or Recovery (unless it's undone) */
if (tp->snd_ssthresh < TCP_INFINITE_SSTHRESH &&
(inet_csk(sk)->icsk_ca_state == TCP_CA_CWR || tp->undo_marker)) {
tp->snd_cwnd = tp->snd_ssthresh;
tcp_snd_cwnd_set(tp, tp->snd_ssthresh);
tp->snd_cwnd_stamp = tcp_jiffies32;
}
tcp_ca_event(sk, CA_EVENT_COMPLETE_CWR);
@ -2709,9 +2709,9 @@ static void tcp_mtup_probe_success(struct sock *sk)
/* FIXME: breaks with very large cwnd */
tp->prior_ssthresh = tcp_current_ssthresh(sk);
tp->snd_cwnd = tp->snd_cwnd *
tcp_mss_to_mtu(sk, tp->mss_cache) /
icsk->icsk_mtup.probe_size;
tcp_snd_cwnd_set(tp, tcp_snd_cwnd(tp) *
tcp_mss_to_mtu(sk, tp->mss_cache) /
icsk->icsk_mtup.probe_size);
tp->snd_cwnd_cnt = 0;
tp->snd_cwnd_stamp = tcp_jiffies32;
tp->snd_ssthresh = tcp_current_ssthresh(sk);
@ -3034,7 +3034,7 @@ static void tcp_fastretrans_alert(struct sock *sk, const u32 prior_snd_una,
tp->snd_una == tp->mtu_probe.probe_seq_start) {
tcp_mtup_probe_failed(sk);
/* Restores the reduction we did in tcp_mtup_probe() */
tp->snd_cwnd++;
tcp_snd_cwnd_set(tp, tcp_snd_cwnd(tp) + 1);
tcp_simple_retransmit(sk);
return;
}
@ -5436,7 +5436,7 @@ static bool tcp_should_expand_sndbuf(struct sock *sk)
return false;
/* If we filled the congestion window, do not expand. */
if (tcp_packets_in_flight(tp) >= tp->snd_cwnd)
if (tcp_packets_in_flight(tp) >= tcp_snd_cwnd(tp))
return false;
return true;
@ -5998,9 +5998,9 @@ void tcp_init_transfer(struct sock *sk, int bpf_op, struct sk_buff *skb)
* retransmission has occurred.
*/
if (tp->total_retrans > 1 && tp->undo_marker)
tp->snd_cwnd = 1;
tcp_snd_cwnd_set(tp, 1);
else
tp->snd_cwnd = tcp_init_cwnd(tp, __sk_dst_get(sk));
tcp_snd_cwnd_set(tp, tcp_init_cwnd(tp, __sk_dst_get(sk)));
tp->snd_cwnd_stamp = tcp_jiffies32;
bpf_skops_established(sk, bpf_op, skb);

2
net/ipv4/tcp_ipv4.c
View File

@ -2621,7 +2621,7 @@ static void get_tcp4_sock(struct sock *sk, struct seq_file *f, int i)
jiffies_to_clock_t(icsk->icsk_rto),
jiffies_to_clock_t(icsk->icsk_ack.ato),
(icsk->icsk_ack.quick << 1) | inet_csk_in_pingpong_mode(sk),
tp->snd_cwnd,
tcp_snd_cwnd(tp),
state == TCP_LISTEN ?
fastopenq->max_qlen :
(tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh));

6
net/ipv4/tcp_lp.c
View File

@ -297,7 +297,7 @@ static void tcp_lp_pkts_acked(struct sock *sk, const struct ack_sample *sample)
lp->flag &= ~LP_WITHIN_THR;
pr_debug("TCP-LP: %05o|%5u|%5u|%15u|%15u|%15u\n", lp->flag,
tp->snd_cwnd, lp->remote_hz, lp->owd_min, lp->owd_max,
tcp_snd_cwnd(tp), lp->remote_hz, lp->owd_min, lp->owd_max,
lp->sowd >> 3);
if (lp->flag & LP_WITHIN_THR)
@ -313,12 +313,12 @@ static void tcp_lp_pkts_acked(struct sock *sk, const struct ack_sample *sample)
/* happened within inference
* drop snd_cwnd into 1 */
if (lp->flag & LP_WITHIN_INF)
tp->snd_cwnd = 1U;
tcp_snd_cwnd_set(tp, 1U);
/* happened after inference
* cut snd_cwnd into half */
else
tp->snd_cwnd = max(tp->snd_cwnd >> 1U, 1U);
tcp_snd_cwnd_set(tp, max(tcp_snd_cwnd(tp) >> 1U, 1U));
/* record this drop time */
lp->last_drop = now;

12
net/ipv4/tcp_metrics.c
View File

@ -388,15 +388,15 @@ void tcp_update_metrics(struct sock *sk)
if (!net->ipv4.sysctl_tcp_no_ssthresh_metrics_save &&
!tcp_metric_locked(tm, TCP_METRIC_SSTHRESH)) {
val = tcp_metric_get(tm, TCP_METRIC_SSTHRESH);
if (val && (tp->snd_cwnd >> 1) > val)
if (val && (tcp_snd_cwnd(tp) >> 1) > val)
tcp_metric_set(tm, TCP_METRIC_SSTHRESH,
tp->snd_cwnd >> 1);
tcp_snd_cwnd(tp) >> 1);
}
if (!tcp_metric_locked(tm, TCP_METRIC_CWND)) {
val = tcp_metric_get(tm, TCP_METRIC_CWND);
if (tp->snd_cwnd > val)
if (tcp_snd_cwnd(tp) > val)
tcp_metric_set(tm, TCP_METRIC_CWND,
tp->snd_cwnd);
tcp_snd_cwnd(tp));
}
} else if (!tcp_in_slow_start(tp) &&
icsk->icsk_ca_state == TCP_CA_Open) {
@ -404,10 +404,10 @@ void tcp_update_metrics(struct sock *sk)
if (!net->ipv4.sysctl_tcp_no_ssthresh_metrics_save &&
!tcp_metric_locked(tm, TCP_METRIC_SSTHRESH))
tcp_metric_set(tm, TCP_METRIC_SSTHRESH,
max(tp->snd_cwnd >> 1, tp->snd_ssthresh));
max(tcp_snd_cwnd(tp) >> 1, tp->snd_ssthresh));
if (!tcp_metric_locked(tm, TCP_METRIC_CWND)) {
val = tcp_metric_get(tm, TCP_METRIC_CWND);
tcp_metric_set(tm, TCP_METRIC_CWND, (val + tp->snd_cwnd) >> 1);
tcp_metric_set(tm, TCP_METRIC_CWND, (val + tcp_snd_cwnd(tp)) >> 1);
}
} else {
/* Else slow start did not finish, cwnd is non-sense,

24
net/ipv4/tcp_nv.c
View File

@ -197,10 +197,10 @@ static void tcpnv_cong_avoid(struct sock *sk, u32 ack, u32 acked)
}
if (ca->cwnd_growth_factor < 0) {
cnt = tp->snd_cwnd << -ca->cwnd_growth_factor;
cnt = tcp_snd_cwnd(tp) << -ca->cwnd_growth_factor;
tcp_cong_avoid_ai(tp, cnt, acked);
} else {
cnt = max(4U, tp->snd_cwnd >> ca->cwnd_growth_factor);
cnt = max(4U, tcp_snd_cwnd(tp) >> ca->cwnd_growth_factor);
tcp_cong_avoid_ai(tp, cnt, acked);
}
}
@ -209,7 +209,7 @@ static u32 tcpnv_recalc_ssthresh(struct sock *sk)
{
const struct tcp_sock *tp = tcp_sk(sk);
return max((tp->snd_cwnd * nv_loss_dec_factor) >> 10, 2U);
return max((tcp_snd_cwnd(tp) * nv_loss_dec_factor) >> 10, 2U);
}
static void tcpnv_state(struct sock *sk, u8 new_state)
@ -257,7 +257,7 @@ static void tcpnv_acked(struct sock *sk, const struct ack_sample *sample)
return;
/* Stop cwnd growth if we were in catch up mode */
if (ca->nv_catchup && tp->snd_cwnd >= nv_min_cwnd) {
if (ca->nv_catchup && tcp_snd_cwnd(tp) >= nv_min_cwnd) {
ca->nv_catchup = 0;
ca->nv_allow_cwnd_growth = 0;
}
@ -371,7 +371,7 @@ static void tcpnv_acked(struct sock *sk, const struct ack_sample *sample)
* if cwnd < max_win, grow cwnd
* else leave the same
*/
if (tp->snd_cwnd > max_win) {
if (tcp_snd_cwnd(tp) > max_win) {
/* there is congestion, check that it is ok
* to make a CA decision
* 1. We should have at least nv_dec_eval_min_calls
@ -398,20 +398,20 @@ static void tcpnv_acked(struct sock *sk, const struct ack_sample *sample)
ca->nv_allow_cwnd_growth = 0;
tp->snd_ssthresh =
(nv_ssthresh_factor * max_win) >> 3;
if (tp->snd_cwnd - max_win > 2) {
if (tcp_snd_cwnd(tp) - max_win > 2) {
/* gap > 2, we do exponential cwnd decrease */
int dec;
dec = max(2U, ((tp->snd_cwnd - max_win) *
dec = max(2U, ((tcp_snd_cwnd(tp) - max_win) *
nv_cong_dec_mult) >> 7);
tp->snd_cwnd -= dec;
tcp_snd_cwnd_set(tp, tcp_snd_cwnd(tp) - dec);
} else if (nv_cong_dec_mult > 0) {
tp->snd_cwnd = max_win;
tcp_snd_cwnd_set(tp, max_win);
}
if (ca->cwnd_growth_factor > 0)
ca->cwnd_growth_factor = 0;
ca->nv_no_cong_cnt = 0;
} else if (tp->snd_cwnd <= max_win - nv_pad_buffer) {
} else if (tcp_snd_cwnd(tp) <= max_win - nv_pad_buffer) {
/* There is no congestion, grow cwnd if allowed*/
if (ca->nv_eval_call_cnt < nv_inc_eval_min_calls)
return;
@ -444,8 +444,8 @@ static void tcpnv_acked(struct sock *sk, const struct ack_sample *sample)
* (it wasn't before, if it is now is because nv
* decreased it).
*/
if (tp->snd_cwnd < nv_min_cwnd)
tp->snd_cwnd = nv_min_cwnd;
if (tcp_snd_cwnd(tp) < nv_min_cwnd)
tcp_snd_cwnd_set(tp, nv_min_cwnd);
}
}

30
net/ipv4/tcp_output.c
View File

@ -142,7 +142,7 @@ void tcp_cwnd_restart(struct sock *sk, s32 delta)
{
struct tcp_sock *tp = tcp_sk(sk);
u32 restart_cwnd = tcp_init_cwnd(tp, __sk_dst_get(sk));
u32 cwnd = tp->snd_cwnd;
u32 cwnd = tcp_snd_cwnd(tp);
tcp_ca_event(sk, CA_EVENT_CWND_RESTART);
@ -151,7 +151,7 @@ void tcp_cwnd_restart(struct sock *sk, s32 delta)
while ((delta -= inet_csk(sk)->icsk_rto) > 0 && cwnd > restart_cwnd)
cwnd >>= 1;
tp->snd_cwnd = max(cwnd, restart_cwnd);
tcp_snd_cwnd_set(tp, max(cwnd, restart_cwnd));
tp->snd_cwnd_stamp = tcp_jiffies32;
tp->snd_cwnd_used = 0;
}
@ -1013,7 +1013,7 @@ static void tcp_tsq_write(struct sock *sk)
struct tcp_sock *tp = tcp_sk(sk);
if (tp->lost_out > tp->retrans_out &&
tp->snd_cwnd > tcp_packets_in_flight(tp)) {
tcp_snd_cwnd(tp) > tcp_packets_in_flight(tp)) {
tcp_mstamp_refresh(tp);
tcp_xmit_retransmit_queue(sk);
}
@ -1860,9 +1860,9 @@ static void tcp_cwnd_application_limited(struct sock *sk)
/* Limited by application or receiver window. */
u32 init_win = tcp_init_cwnd(tp, __sk_dst_get(sk));
u32 win_used = max(tp->snd_cwnd_used, init_win);
if (win_used < tp->snd_cwnd) {
if (win_used < tcp_snd_cwnd(tp)) {
tp->snd_ssthresh = tcp_current_ssthresh(sk);
tp->snd_cwnd = (tp->snd_cwnd + win_used) >> 1;
tcp_snd_cwnd_set(tp, (tcp_snd_cwnd(tp) + win_used) >> 1);
}
tp->snd_cwnd_used = 0;
}
@ -2043,7 +2043,7 @@ static inline unsigned int tcp_cwnd_test(const struct tcp_sock *tp,
return 1;
in_flight = tcp_packets_in_flight(tp);
cwnd = tp->snd_cwnd;
cwnd = tcp_snd_cwnd(tp);
if (in_flight >= cwnd)
return 0;
@ -2196,12 +2196,12 @@ static bool tcp_tso_should_defer(struct sock *sk, struct sk_buff *skb,
in_flight = tcp_packets_in_flight(tp);
BUG_ON(tcp_skb_pcount(skb) <= 1);
BUG_ON(tp->snd_cwnd <= in_flight);
BUG_ON(tcp_snd_cwnd(tp) <= in_flight);
send_win = tcp_wnd_end(tp) - TCP_SKB_CB(skb)->seq;
/* From in_flight test above, we know that cwnd > in_flight. */
cong_win = (tp->snd_cwnd - in_flight) * tp->mss_cache;
cong_win = (tcp_snd_cwnd(tp) - in_flight) * tp->mss_cache;
limit = min(send_win, cong_win);
@ -2215,7 +2215,7 @@ static bool tcp_tso_should_defer(struct sock *sk, struct sk_buff *skb,
win_divisor = READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_tso_win_divisor);
if (win_divisor) {
u32 chunk = min(tp->snd_wnd, tp->snd_cwnd * tp->mss_cache);
u32 chunk = min(tp->snd_wnd, tcp_snd_cwnd(tp) * tp->mss_cache);
/* If at least some fraction of a window is available,
* just use it.
@ -2345,7 +2345,7 @@ static int tcp_mtu_probe(struct sock *sk)
if (likely(!icsk->icsk_mtup.enabled ||
icsk->icsk_mtup.probe_size ||
inet_csk(sk)->icsk_ca_state != TCP_CA_Open ||
tp->snd_cwnd < 11 ||
tcp_snd_cwnd(tp) < 11 ||
tp->rx_opt.num_sacks || tp->rx_opt.dsack))
return -1;
@ -2381,7 +2381,7 @@ static int tcp_mtu_probe(struct sock *sk)
return 0;
/* Do we need to wait to drain cwnd? With none in flight, don't stall */
if (tcp_packets_in_flight(tp) + 2 > tp->snd_cwnd) {
if (tcp_packets_in_flight(tp) + 2 > tcp_snd_cwnd(tp)) {
if (!tcp_packets_in_flight(tp))
return -1;
else
@ -2450,7 +2450,7 @@ static int tcp_mtu_probe(struct sock *sk)
if (!tcp_transmit_skb(sk, nskb, 1, GFP_ATOMIC)) {
/* Decrement cwnd here because we are sending
* effectively two packets. */
tp->snd_cwnd--;
tcp_snd_cwnd_set(tp, tcp_snd_cwnd(tp) - 1);
tcp_event_new_data_sent(sk, nskb);
icsk->icsk_mtup.probe_size = tcp_mss_to_mtu(sk, nskb->len);
@ -2708,7 +2708,7 @@ static bool tcp_write_xmit(struct sock *sk, unsigned int mss_now, int nonagle,
else
tcp_chrono_stop(sk, TCP_CHRONO_RWND_LIMITED);
is_cwnd_limited |= (tcp_packets_in_flight(tp) >= tp->snd_cwnd);
is_cwnd_limited |= (tcp_packets_in_flight(tp) >= tcp_snd_cwnd(tp));
if (likely(sent_pkts || is_cwnd_limited))
tcp_cwnd_validate(sk, is_cwnd_limited);
@ -2818,7 +2818,7 @@ void tcp_send_loss_probe(struct sock *sk)
if (unlikely(!skb)) {
WARN_ONCE(tp->packets_out,
"invalid inflight: %u state %u cwnd %u mss %d\n",
tp->packets_out, sk->sk_state, tp->snd_cwnd, mss);
tp->packets_out, sk->sk_state, tcp_snd_cwnd(tp), mss);
inet_csk(sk)->icsk_pending = 0;
return;
}
@ -3302,7 +3302,7 @@ void tcp_xmit_retransmit_queue(struct sock *sk)
if (!hole)
tp->retransmit_skb_hint = skb;
segs = tp->snd_cwnd - tcp_packets_in_flight(tp);
segs = tcp_snd_cwnd(tp) - tcp_packets_in_flight(tp);
if (segs <= 0)
break;
sacked = TCP_SKB_CB(skb)->sacked;

2
net/ipv4/tcp_rate.c
View File

@ -195,7 +195,7 @@ void tcp_rate_check_app_limited(struct sock *sk)
/* Nothing in sending host's qdisc queues or NIC tx queue. */
sk_wmem_alloc_get(sk) < SKB_TRUESIZE(1) &&
/* We are not limited by CWND. */
tcp_packets_in_flight(tp) < tp->snd_cwnd &&
tcp_packets_in_flight(tp) < tcp_snd_cwnd(tp) &&
/* All lost packets have been retransmitted. */
tp->lost_out <= tp->retrans_out)
tp->app_limited =

4
net/ipv4/tcp_scalable.c
View File

@ -27,7 +27,7 @@ static void tcp_scalable_cong_avoid(struct sock *sk, u32 ack, u32 acked)
if (!acked)
return;
}
tcp_cong_avoid_ai(tp, min(tp->snd_cwnd, TCP_SCALABLE_AI_CNT),
tcp_cong_avoid_ai(tp, min(tcp_snd_cwnd(tp), TCP_SCALABLE_AI_CNT),
acked);
}
@ -35,7 +35,7 @@ static u32 tcp_scalable_ssthresh(struct sock *sk)
{
const struct tcp_sock *tp = tcp_sk(sk);
return max(tp->snd_cwnd - (tp->snd_cwnd>>TCP_SCALABLE_MD_SCALE), 2U);
return max(tcp_snd_cwnd(tp) - (tcp_snd_cwnd(tp)>>TCP_SCALABLE_MD_SCALE), 2U);
}
static struct tcp_congestion_ops tcp_scalable __read_mostly = {

21
net/ipv4/tcp_vegas.c
View File

@ -159,7 +159,7 @@ EXPORT_SYMBOL_GPL(tcp_vegas_cwnd_event);
static inline u32 tcp_vegas_ssthresh(struct tcp_sock *tp)
{
return min(tp->snd_ssthresh, tp->snd_cwnd);
return min(tp->snd_ssthresh, tcp_snd_cwnd(tp));
}
static void tcp_vegas_cong_avoid(struct sock *sk, u32 ack, u32 acked)
@ -217,14 +217,14 @@ static void tcp_vegas_cong_avoid(struct sock *sk, u32 ack, u32 acked)
* This is:
* (actual rate in segments) * baseRTT
*/
target_cwnd = (u64)tp->snd_cwnd * vegas->baseRTT;
target_cwnd = (u64)tcp_snd_cwnd(tp) * vegas->baseRTT;
do_div(target_cwnd, rtt);
/* Calculate the difference between the window we had,
* and the window we would like to have. This quantity
* is the "Diff" from the Arizona Vegas papers.
*/
diff = tp->snd_cwnd * (rtt-vegas->baseRTT) / vegas->baseRTT;
diff = tcp_snd_cwnd(tp) * (rtt-vegas->baseRTT) / vegas->baseRTT;
if (diff > gamma && tcp_in_slow_start(tp)) {
/* Going too fast. Time to slow down
@ -238,7 +238,8 @@ static void tcp_vegas_cong_avoid(struct sock *sk, u32 ack, u32 acked)
* truncation robs us of full link
* utilization.
*/
tp->snd_cwnd = min(tp->snd_cwnd, (u32)target_cwnd+1);
tcp_snd_cwnd_set(tp, min(tcp_snd_cwnd(tp),
(u32)target_cwnd + 1));
tp->snd_ssthresh = tcp_vegas_ssthresh(tp);
} else if (tcp_in_slow_start(tp)) {
@ -254,14 +255,14 @@ static void tcp_vegas_cong_avoid(struct sock *sk, u32 ack, u32 acked)
/* The old window was too fast, so
* we slow down.
*/
tp->snd_cwnd--;
tcp_snd_cwnd_set(tp, tcp_snd_cwnd(tp) - 1);
tp->snd_ssthresh
= tcp_vegas_ssthresh(tp);
} else if (diff < alpha) {
/* We don't have enough extra packets
* in the network, so speed up.
*/
tp->snd_cwnd++;
tcp_snd_cwnd_set(tp, tcp_snd_cwnd(tp) + 1);
} else {
/* Sending just as fast as we
* should be.
@ -269,10 +270,10 @@ static void tcp_vegas_cong_avoid(struct sock *sk, u32 ack, u32 acked)
}
}
if (tp->snd_cwnd < 2)
tp->snd_cwnd = 2;
else if (tp->snd_cwnd > tp->snd_cwnd_clamp)
tp->snd_cwnd = tp->snd_cwnd_clamp;
if (tcp_snd_cwnd(tp) < 2)
tcp_snd_cwnd_set(tp, 2);
else if (tcp_snd_cwnd(tp) > tp->snd_cwnd_clamp)
tcp_snd_cwnd_set(tp, tp->snd_cwnd_clamp);
tp->snd_ssthresh = tcp_current_ssthresh(sk);
}

24
net/ipv4/tcp_veno.c
View File

@ -146,11 +146,11 @@ static void tcp_veno_cong_avoid(struct sock *sk, u32 ack, u32 acked)
rtt = veno->minrtt;
target_cwnd = (u64)tp->snd_cwnd * veno->basertt;
target_cwnd = (u64)tcp_snd_cwnd(tp) * veno->basertt;
target_cwnd <<= V_PARAM_SHIFT;
do_div(target_cwnd, rtt);
veno->diff = (tp->snd_cwnd << V_PARAM_SHIFT) - target_cwnd;
veno->diff = (tcp_snd_cwnd(tp) << V_PARAM_SHIFT) - target_cwnd;
if (tcp_in_slow_start(tp)) {
/* Slow start. */
@ -164,15 +164,15 @@ static void tcp_veno_cong_avoid(struct sock *sk, u32 ack, u32 acked)
/* In the "non-congestive state", increase cwnd
* every rtt.
*/
tcp_cong_avoid_ai(tp, tp->snd_cwnd, acked);
tcp_cong_avoid_ai(tp, tcp_snd_cwnd(tp), acked);
} else {
/* In the "congestive state", increase cwnd
* every other rtt.
*/
if (tp->snd_cwnd_cnt >= tp->snd_cwnd) {
if (tp->snd_cwnd_cnt >= tcp_snd_cwnd(tp)) {
if (veno->inc &&
tp->snd_cwnd < tp->snd_cwnd_clamp) {
tp->snd_cwnd++;
tcp_snd_cwnd(tp) < tp->snd_cwnd_clamp) {
tcp_snd_cwnd_set(tp, tcp_snd_cwnd(tp) + 1);
veno->inc = 0;
} else
veno->inc = 1;
@ -181,10 +181,10 @@ static void tcp_veno_cong_avoid(struct sock *sk, u32 ack, u32 acked)
tp->snd_cwnd_cnt += acked;
}
done:
if (tp->snd_cwnd < 2)
tp->snd_cwnd = 2;
else if (tp->snd_cwnd > tp->snd_cwnd_clamp)
tp->snd_cwnd = tp->snd_cwnd_clamp;
if (tcp_snd_cwnd(tp) < 2)
tcp_snd_cwnd_set(tp, 2);
else if (tcp_snd_cwnd(tp) > tp->snd_cwnd_clamp)
tcp_snd_cwnd_set(tp, tp->snd_cwnd_clamp);
}
/* Wipe the slate clean for the next rtt. */
/* veno->cntrtt = 0; */
@ -199,10 +199,10 @@ static u32 tcp_veno_ssthresh(struct sock *sk)
if (veno->diff < beta)
/* in "non-congestive state", cut cwnd by 1/5 */
return max(tp->snd_cwnd * 4 / 5, 2U);
return max(tcp_snd_cwnd(tp) * 4 / 5, 2U);
else
/* in "congestive state", cut cwnd by 1/2 */
return max(tp->snd_cwnd >> 1U, 2U);
return max(tcp_snd_cwnd(tp) >> 1U, 2U);
}
static struct tcp_congestion_ops tcp_veno __read_mostly = {

3
net/ipv4/tcp_westwood.c
View File

@ -244,7 +244,8 @@ static void tcp_westwood_event(struct sock *sk, enum tcp_ca_event event)
switch (event) {
case CA_EVENT_COMPLETE_CWR:
tp->snd_cwnd = tp->snd_ssthresh = tcp_westwood_bw_rttmin(sk);
tp->snd_ssthresh = tcp_westwood_bw_rttmin(sk);
tcp_snd_cwnd_set(tp, tp->snd_ssthresh);
break;
case CA_EVENT_LOSS:
tp->snd_ssthresh = tcp_westwood_bw_rttmin(sk);

30
net/ipv4/tcp_yeah.c
View File

@ -71,11 +71,11 @@ static void tcp_yeah_cong_avoid(struct sock *sk, u32 ack, u32 acked)
if (!yeah->doing_reno_now) {
/* Scalable */
tcp_cong_avoid_ai(tp, min(tp->snd_cwnd, TCP_SCALABLE_AI_CNT),
tcp_cong_avoid_ai(tp, min(tcp_snd_cwnd(tp), TCP_SCALABLE_AI_CNT),
acked);
} else {
/* Reno */
tcp_cong_avoid_ai(tp, tp->snd_cwnd, acked);
tcp_cong_avoid_ai(tp, tcp_snd_cwnd(tp), acked);
}
/* The key players are v_vegas.beg_snd_una and v_beg_snd_nxt.
@ -130,7 +130,7 @@ static void tcp_yeah_cong_avoid(struct sock *sk, u32 ack, u32 acked)
/* Compute excess number of packets above bandwidth
* Avoid doing full 64 bit divide.
*/
bw = tp->snd_cwnd;
bw = tcp_snd_cwnd(tp);
bw *= rtt - yeah->vegas.baseRTT;
do_div(bw, rtt);
queue = bw;
@ -138,20 +138,20 @@ static void tcp_yeah_cong_avoid(struct sock *sk, u32 ack, u32 acked)
if (queue > TCP_YEAH_ALPHA ||
rtt - yeah->vegas.baseRTT > (yeah->vegas.baseRTT / TCP_YEAH_PHY)) {
if (queue > TCP_YEAH_ALPHA &&
tp->snd_cwnd > yeah->reno_count) {
tcp_snd_cwnd(tp) > yeah->reno_count) {
u32 reduction = min(queue / TCP_YEAH_GAMMA ,
tp->snd_cwnd >> TCP_YEAH_EPSILON);
tcp_snd_cwnd(tp) >> TCP_YEAH_EPSILON);
tp->snd_cwnd -= reduction;
tcp_snd_cwnd_set(tp, tcp_snd_cwnd(tp) - reduction);
tp->snd_cwnd = max(tp->snd_cwnd,
yeah->reno_count);
tcp_snd_cwnd_set(tp, max(tcp_snd_cwnd(tp),
yeah->reno_count));
tp->snd_ssthresh = tp->snd_cwnd;
tp->snd_ssthresh = tcp_snd_cwnd(tp);
}
if (yeah->reno_count <= 2)
yeah->reno_count = max(tp->snd_cwnd>>1, 2U);
yeah->reno_count = max(tcp_snd_cwnd(tp)>>1, 2U);
else
yeah->reno_count++;
@ -176,7 +176,7 @@ static void tcp_yeah_cong_avoid(struct sock *sk, u32 ack, u32 acked)
*/
yeah->vegas.beg_snd_una = yeah->vegas.beg_snd_nxt;
yeah->vegas.beg_snd_nxt = tp->snd_nxt;
yeah->vegas.beg_snd_cwnd = tp->snd_cwnd;
yeah->vegas.beg_snd_cwnd = tcp_snd_cwnd(tp);
/* Wipe the slate clean for the next RTT. */
yeah->vegas.cntRTT = 0;
@ -193,16 +193,16 @@ static u32 tcp_yeah_ssthresh(struct sock *sk)
if (yeah->doing_reno_now < TCP_YEAH_RHO) {
reduction = yeah->lastQ;
reduction = min(reduction, max(tp->snd_cwnd>>1, 2U));
reduction = min(reduction, max(tcp_snd_cwnd(tp)>>1, 2U));
reduction = max(reduction, tp->snd_cwnd >> TCP_YEAH_DELTA);
reduction = max(reduction, tcp_snd_cwnd(tp) >> TCP_YEAH_DELTA);
} else
reduction = max(tp->snd_cwnd>>1, 2U);
reduction = max(tcp_snd_cwnd(tp)>>1, 2U);
yeah->fast_count = 0;
yeah->reno_count = max(yeah->reno_count>>1, 2U);
return max_t(int, tp->snd_cwnd - reduction, 2);
return max_t(int, tcp_snd_cwnd(tp) - reduction, 2);
}
static struct tcp_congestion_ops tcp_yeah __read_mostly = {

2
net/ipv6/tcp_ipv6.c
View File

@ -2044,7 +2044,7 @@ static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i)
jiffies_to_clock_t(icsk->icsk_rto),
jiffies_to_clock_t(icsk->icsk_ack.ato),
(icsk->icsk_ack.quick << 1) | inet_csk_in_pingpong_mode(sp),
tp->snd_cwnd,
tcp_snd_cwnd(tp),
state == TCP_LISTEN ?
fastopenq->max_qlen :
(tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh)