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tcp: replace cnt & rtt with struct in pkts_acked() 

Replace 2 arguments (cnt and rtt) in the congestion control modules'
pkts_acked() function with a struct. This will allow adding more
information without having to modify existing congestion control
modules (tcp_nv in particular needs bytes in flight when packet
was sent).

As proposed by Neal Cardwell in his comments to the tcp_nv patch.

Signed-off-by: Lawrence Brakmo <brakmo@fb.com>
Acked-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Lawrence Brakmo 2016-05-11 10:02:13 -07:00 committed by David S. Miller
parent cf88585b1d
commit 756ee1729b
13 changed files with 60 additions and 47 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
include/net/tcp.h
View File

@ -854,6 +854,11 @@ enum tcp_ca_ack_event_flags {
union tcp_cc_info;
struct ack_sample {
u32 pkts_acked;
s32 rtt_us;
};
struct tcp_congestion_ops {
struct list_head list;
u32 key;
@ -877,7 +882,7 @@ struct tcp_congestion_ops {
/* new value of cwnd after loss (optional) */
u32 (*undo_cwnd)(struct sock *sk);
/* hook for packet ack accounting (optional) */
void (*pkts_acked)(struct sock *sk, u32 num_acked, s32 rtt_us);
void (*pkts_acked)(struct sock *sk, const struct ack_sample *sample);
/* get info for inet_diag (optional) */
size_t (*get_info)(struct sock *sk, u32 ext, int *attr,
union tcp_cc_info *info);

6
net/ipv4/tcp_bic.c
View File

@ -197,15 +197,15 @@ static void bictcp_state(struct sock *sk, u8 new_state)
/* Track delayed acknowledgment ratio using sliding window
* ratio = (15*ratio + sample) / 16
*/
static void bictcp_acked(struct sock *sk, u32 cnt, s32 rtt)
static void bictcp_acked(struct sock *sk, const struct ack_sample *sample)
{
const struct inet_connection_sock *icsk = inet_csk(sk);
if (icsk->icsk_ca_state == TCP_CA_Open) {
struct bictcp *ca = inet_csk_ca(sk);
cnt -= ca->delayed_ack >> ACK_RATIO_SHIFT;
ca->delayed_ack += cnt;
ca->delayed_ack += sample->pkts_acked -
(ca->delayed_ack >> ACK_RATIO_SHIFT);
}
}

14
net/ipv4/tcp_cdg.c
View File

@ -294,12 +294,12 @@ static void tcp_cdg_cong_avoid(struct sock *sk, u32 ack, u32 acked)
ca->shadow_wnd = max(ca->shadow_wnd, ca->shadow_wnd + incr);
}
static void tcp_cdg_acked(struct sock *sk, u32 num_acked, s32 rtt_us)
static void tcp_cdg_acked(struct sock *sk, const struct ack_sample *sample)
{
struct cdg *ca = inet_csk_ca(sk);
struct tcp_sock *tp = tcp_sk(sk);
if (rtt_us <= 0)
if (sample->rtt_us <= 0)
return;
/* A heuristic for filtering delayed ACKs, adapted from:
@ -307,20 +307,20 @@ static void tcp_cdg_acked(struct sock *sk, u32 num_acked, s32 rtt_us)
* delay and rate based TCP mechanisms." TR 100219A. CAIA, 2010.
*/
if (tp->sacked_out == 0) {
if (num_acked == 1 && ca->delack) {
if (sample->pkts_acked == 1 && ca->delack) {
/* A delayed ACK is only used for the minimum if it is
* provenly lower than an existing non-zero minimum.
*/
ca->rtt.min = min(ca->rtt.min, rtt_us);
ca->rtt.min = min(ca->rtt.min, sample->rtt_us);
ca->delack--;
return;
} else if (num_acked > 1 && ca->delack < 5) {
} else if (sample->pkts_acked > 1 && ca->delack < 5) {
ca->delack++;
}
}
ca->rtt.min = min_not_zero(ca->rtt.min, rtt_us);
ca->rtt.max = max(ca->rtt.max, rtt_us);
ca->rtt.min = min_not_zero(ca->rtt.min, sample->rtt_us);
ca->rtt.max = max(ca->rtt.max, sample->rtt_us);
}
static u32 tcp_cdg_ssthresh(struct sock *sk)

6
net/ipv4/tcp_cubic.c
View File

@ -437,21 +437,21 @@ static void hystart_update(struct sock *sk, u32 delay)
/* Track delayed acknowledgment ratio using sliding window
* ratio = (15*ratio + sample) / 16
*/
static void bictcp_acked(struct sock *sk, u32 cnt, s32 rtt_us)
static void bictcp_acked(struct sock *sk, const struct ack_sample *sample)
{
const struct tcp_sock *tp = tcp_sk(sk);
struct bictcp *ca = inet_csk_ca(sk);
u32 delay;
/* Some calls are for duplicates without timetamps */
if (rtt_us < 0)
if (sample->rtt_us < 0)
return;
/* Discard delay samples right after fast recovery */
if (ca->epoch_start && (s32)(tcp_time_stamp - ca->epoch_start) < HZ)
return;
delay = (rtt_us << 3) / USEC_PER_MSEC;
delay = (sample->rtt_us << 3) / USEC_PER_MSEC;
if (delay == 0)
delay = 1;

10
net/ipv4/tcp_htcp.c
View File

@ -99,7 +99,7 @@ static inline void measure_rtt(struct sock *sk, u32 srtt)
}
static void measure_achieved_throughput(struct sock *sk,
u32 pkts_acked, s32 rtt)
const struct ack_sample *sample)
{
const struct inet_connection_sock *icsk = inet_csk(sk);
const struct tcp_sock *tp = tcp_sk(sk);
@ -107,10 +107,10 @@ static void measure_achieved_throughput(struct sock *sk,
u32 now = tcp_time_stamp;
if (icsk->icsk_ca_state == TCP_CA_Open)
ca->pkts_acked = pkts_acked;
ca->pkts_acked = sample->pkts_acked;
if (rtt > 0)
measure_rtt(sk, usecs_to_jiffies(rtt));
if (sample->rtt_us > 0)
measure_rtt(sk, usecs_to_jiffies(sample->rtt_us));
if (!use_bandwidth_switch)
return;
@ -122,7 +122,7 @@ static void measure_achieved_throughput(struct sock *sk,
return;
}
ca->packetcount += pkts_acked;
ca->packetcount += sample->pkts_acked;
if (ca->packetcount >= tp->snd_cwnd - (ca->alpha >> 7 ? : 1) &&
now - ca->lasttime >= ca->minRTT &&

21
net/ipv4/tcp_illinois.c
View File

@ -82,30 +82,31 @@ static void tcp_illinois_init(struct sock *sk)
}
/* Measure RTT for each ack. */
static void tcp_illinois_acked(struct sock *sk, u32 pkts_acked, s32 rtt)
static void tcp_illinois_acked(struct sock *sk, const struct ack_sample *sample)
{
struct illinois *ca = inet_csk_ca(sk);
s32 rtt_us = sample->rtt_us;
ca->acked = pkts_acked;
ca->acked = sample->pkts_acked;
/* dup ack, no rtt sample */
if (rtt < 0)
if (rtt_us < 0)
return;
/* ignore bogus values, this prevents wraparound in alpha math */
if (rtt > RTT_MAX)
rtt = RTT_MAX;
if (rtt_us > RTT_MAX)
rtt_us = RTT_MAX;
/* keep track of minimum RTT seen so far */
if (ca->base_rtt > rtt)
ca->base_rtt = rtt;
if (ca->base_rtt > rtt_us)
ca->base_rtt = rtt_us;
/* and max */
if (ca->max_rtt < rtt)
ca->max_rtt = rtt;
if (ca->max_rtt < rtt_us)
ca->max_rtt = rtt_us;
++ca->cnt_rtt;
ca->sum_rtt += rtt;
ca->sum_rtt += rtt_us;
}
/* Maximum queuing delay */

8
net/ipv4/tcp_input.c
View File

@ -3248,8 +3248,12 @@ static int tcp_clean_rtx_queue(struct sock *sk, int prior_fackets,
tcp_rearm_rto(sk);
}
if (icsk->icsk_ca_ops->pkts_acked)
icsk->icsk_ca_ops->pkts_acked(sk, pkts_acked, ca_rtt_us);
if (icsk->icsk_ca_ops->pkts_acked) {
struct ack_sample sample = { .pkts_acked = pkts_acked,
.rtt_us = ca_rtt_us };
icsk->icsk_ca_ops->pkts_acked(sk, &sample);
}
#if FASTRETRANS_DEBUG > 0
WARN_ON((int)tp->sacked_out < 0);

6
net/ipv4/tcp_lp.c
View File

@ -260,13 +260,13 @@ static void tcp_lp_rtt_sample(struct sock *sk, u32 rtt)
* newReno in increase case.
* We work it out by following the idea from TCP-LP's paper directly
*/
static void tcp_lp_pkts_acked(struct sock *sk, u32 num_acked, s32 rtt_us)
static void tcp_lp_pkts_acked(struct sock *sk, const struct ack_sample *sample)
{
struct tcp_sock *tp = tcp_sk(sk);
struct lp *lp = inet_csk_ca(sk);
if (rtt_us > 0)
tcp_lp_rtt_sample(sk, rtt_us);
if (sample->rtt_us > 0)
tcp_lp_rtt_sample(sk, sample->rtt_us);
/* calc inference */
if (tcp_time_stamp > tp->rx_opt.rcv_tsecr)

6
net/ipv4/tcp_vegas.c
View File

@ -107,16 +107,16 @@ EXPORT_SYMBOL_GPL(tcp_vegas_init);
* o min-filter RTT samples from a much longer window (forever for now)
* to find the propagation delay (baseRTT)
*/
void tcp_vegas_pkts_acked(struct sock *sk, u32 cnt, s32 rtt_us)
void tcp_vegas_pkts_acked(struct sock *sk, const struct ack_sample *sample)
{
struct vegas *vegas = inet_csk_ca(sk);
u32 vrtt;
if (rtt_us < 0)
if (sample->rtt_us < 0)
return;
/* Never allow zero rtt or baseRTT */
vrtt = rtt_us + 1;
vrtt = sample->rtt_us + 1;
/* Filter to find propagation delay: */
if (vrtt < vegas->baseRTT)

2
net/ipv4/tcp_vegas.h
View File

@ -17,7 +17,7 @@ struct vegas {
void tcp_vegas_init(struct sock *sk);
void tcp_vegas_state(struct sock *sk, u8 ca_state);
void tcp_vegas_pkts_acked(struct sock *sk, u32 cnt, s32 rtt_us);
void tcp_vegas_pkts_acked(struct sock *sk, const struct ack_sample *sample);
void tcp_vegas_cwnd_event(struct sock *sk, enum tcp_ca_event event);
size_t tcp_vegas_get_info(struct sock *sk, u32 ext, int *attr,
union tcp_cc_info *info);

7
net/ipv4/tcp_veno.c
View File

@ -69,16 +69,17 @@ static void tcp_veno_init(struct sock *sk)
}
/* Do rtt sampling needed for Veno. */
static void tcp_veno_pkts_acked(struct sock *sk, u32 cnt, s32 rtt_us)
static void tcp_veno_pkts_acked(struct sock *sk,
const struct ack_sample *sample)
{
struct veno *veno = inet_csk_ca(sk);
u32 vrtt;
if (rtt_us < 0)
if (sample->rtt_us < 0)
return;
/* Never allow zero rtt or baseRTT */
vrtt = rtt_us + 1;
vrtt = sample->rtt_us + 1;
/* Filter to find propagation delay: */
if (vrtt < veno->basertt)

7
net/ipv4/tcp_westwood.c
View File

@ -99,12 +99,13 @@ static void westwood_filter(struct westwood *w, u32 delta)
* Called after processing group of packets.
* but all westwood needs is the last sample of srtt.
*/
static void tcp_westwood_pkts_acked(struct sock *sk, u32 cnt, s32 rtt)
static void tcp_westwood_pkts_acked(struct sock *sk,
const struct ack_sample *sample)
{
struct westwood *w = inet_csk_ca(sk);
if (rtt > 0)
w->rtt = usecs_to_jiffies(rtt);
if (sample->rtt_us > 0)
w->rtt = usecs_to_jiffies(sample->rtt_us);
}
/*

7
net/ipv4/tcp_yeah.c
View File

@ -56,15 +56,16 @@ static void tcp_yeah_init(struct sock *sk)
tp->snd_cwnd_clamp = min_t(u32, tp->snd_cwnd_clamp, 0xffffffff/128);
}
static void tcp_yeah_pkts_acked(struct sock *sk, u32 pkts_acked, s32 rtt_us)
static void tcp_yeah_pkts_acked(struct sock *sk,
const struct ack_sample *sample)
{
const struct inet_connection_sock *icsk = inet_csk(sk);
struct yeah *yeah = inet_csk_ca(sk);
if (icsk->icsk_ca_state == TCP_CA_Open)
yeah->pkts_acked = pkts_acked;
yeah->pkts_acked = sample->pkts_acked;
tcp_vegas_pkts_acked(sk, pkts_acked, rtt_us);
tcp_vegas_pkts_acked(sk, sample);
}
static void tcp_yeah_cong_avoid(struct sock *sk, u32 ack, u32 acked)