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[TCP]: Congestion control API update. 

Do some simple changes to make congestion control API faster/cleaner.
* use ktime_t rather than timeval
* merge rtt sampling into existing ack callback
  this means one indirect call versus two per ack.
* use flags bits to store options/settings

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stephen Hemminger 2007-04-23 22:26:16 -07:00 committed by David S. Miller
parent 65d1b4a7e7
commit 164891aadf
15 changed files with 65 additions and 55 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
include/linux/skbuff.h
View File

@ -1569,6 +1569,11 @@ static inline void __net_timestamp(struct sk_buff *skb)
skb->tstamp = ktime_get_real();
}
static inline ktime_t net_timedelta(ktime_t t)
{
return ktime_sub(ktime_get_real(), t);
}
extern __sum16 __skb_checksum_complete_head(struct sk_buff *skb, int len);
extern __sum16 __skb_checksum_complete(struct sk_buff *skb);

9
include/net/tcp.h
View File

@ -629,9 +629,12 @@ enum tcp_ca_event {
#define TCP_CA_MAX 128
#define TCP_CA_BUF_MAX (TCP_CA_NAME_MAX*TCP_CA_MAX)
#define TCP_CONG_NON_RESTRICTED 0x1
#define TCP_CONG_RTT_STAMP 0x2
struct tcp_congestion_ops {
struct list_head list;
int non_restricted;
unsigned long flags;
/* initialize private data (optional) */
void (*init)(struct sock *sk);
@ -645,8 +648,6 @@ struct tcp_congestion_ops {
/* do new cwnd calculation (required) */
void (*cong_avoid)(struct sock *sk, u32 ack,
u32 rtt, u32 in_flight, int good_ack);
/* round trip time sample per acked packet (optional) */
void (*rtt_sample)(struct sock *sk, u32 usrtt);
/* call before changing ca_state (optional) */
void (*set_state)(struct sock *sk, u8 new_state);
/* call when cwnd event occurs (optional) */
@ -654,7 +655,7 @@ 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);
void (*pkts_acked)(struct sock *sk, u32 num_acked, ktime_t last);
/* get info for inet_diag (optional) */
void (*get_info)(struct sock *sk, u32 ext, struct sk_buff *skb);

2
net/ipv4/tcp_bic.c
View File

@ -206,7 +206,7 @@ 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)
static void bictcp_acked(struct sock *sk, u32 cnt, ktime_t last)
{
const struct inet_connection_sock *icsk = inet_csk(sk);

14
net/ipv4/tcp_cong.c
View File

@ -126,7 +126,7 @@ int tcp_set_default_congestion_control(const char *name)
#endif
if (ca) {
ca->non_restricted = 1; /* default is always allowed */
ca->flags |= TCP_CONG_NON_RESTRICTED; /* default is always allowed */
list_move(&ca->list, &tcp_cong_list);
ret = 0;
}
@ -181,7 +181,7 @@ void tcp_get_allowed_congestion_control(char *buf, size_t maxlen)
*buf = '\0';
rcu_read_lock();
list_for_each_entry_rcu(ca, &tcp_cong_list, list) {
if (!ca->non_restricted)
if (!(ca->flags & TCP_CONG_NON_RESTRICTED))
continue;
offs += snprintf(buf + offs, maxlen - offs,
"%s%s",
@ -212,16 +212,16 @@ int tcp_set_allowed_congestion_control(char *val)
}
}
/* pass 2 clear */
/* pass 2 clear old values */
list_for_each_entry_rcu(ca, &tcp_cong_list, list)
ca->non_restricted = 0;
ca->flags &= ~TCP_CONG_NON_RESTRICTED;
/* pass 3 mark as allowed */
while ((name = strsep(&val, " ")) && *name) {
ca = tcp_ca_find(name);
WARN_ON(!ca);
if (ca)
ca->non_restricted = 1;
ca->flags |= TCP_CONG_NON_RESTRICTED;
}
out:
spin_unlock(&tcp_cong_list_lock);
@ -256,7 +256,7 @@ int tcp_set_congestion_control(struct sock *sk, const char *name)
if (!ca)
err = -ENOENT;
else if (!(ca->non_restricted || capable(CAP_NET_ADMIN)))
else if (!((ca->flags & TCP_CONG_NON_RESTRICTED) || capable(CAP_NET_ADMIN)))
err = -EPERM;
else if (!try_module_get(ca->owner))
@ -371,8 +371,8 @@ u32 tcp_reno_min_cwnd(const struct sock *sk)
EXPORT_SYMBOL_GPL(tcp_reno_min_cwnd);
struct tcp_congestion_ops tcp_reno = {
.flags = TCP_CONG_NON_RESTRICTED,
.name = "reno",
.non_restricted = 1,
.owner = THIS_MODULE,
.ssthresh = tcp_reno_ssthresh,
.cong_avoid = tcp_reno_cong_avoid,

2
net/ipv4/tcp_cubic.c
View File

@ -334,7 +334,7 @@ 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)
static void bictcp_acked(struct sock *sk, u32 cnt, ktime_t last)
{
const struct inet_connection_sock *icsk = inet_csk(sk);

2
net/ipv4/tcp_htcp.c
View File

@ -98,7 +98,7 @@ static inline void measure_rtt(struct sock *sk)
}
}
static void measure_achieved_throughput(struct sock *sk, u32 pkts_acked)
static void measure_achieved_throughput(struct sock *sk, u32 pkts_acked, ktime_t last)
{
const struct inet_connection_sock *icsk = inet_csk(sk);
const struct tcp_sock *tp = tcp_sk(sk);

16
net/ipv4/tcp_illinois.c
View File

@ -83,9 +83,14 @@ static void tcp_illinois_init(struct sock *sk)
}
/* Measure RTT for each ack. */
static void tcp_illinois_rtt_sample(struct sock *sk, u32 rtt)
static void tcp_illinois_acked(struct sock *sk, u32 pkts_acked, ktime_t last)
{
struct illinois *ca = inet_csk_ca(sk);
u32 rtt;
ca->acked = pkts_acked;
rtt = ktime_to_ns(net_timedelta(last)) / NSEC_PER_USEC;
/* ignore bogus values, this prevents wraparound in alpha math */
if (rtt > RTT_MAX)
@ -103,13 +108,6 @@ static void tcp_illinois_rtt_sample(struct sock *sk, u32 rtt)
ca->sum_rtt += rtt;
}
/* Capture count of packets covered by ack, to adjust for delayed acks */
static void tcp_illinois_acked(struct sock *sk, u32 pkts_acked)
{
struct illinois *ca = inet_csk_ca(sk);
ca->acked = pkts_acked;
}
/* Maximum queuing delay */
static inline u32 max_delay(const struct illinois *ca)
{
@ -325,12 +323,12 @@ static void tcp_illinois_info(struct sock *sk, u32 ext,
}
static struct tcp_congestion_ops tcp_illinois = {
.flags = TCP_CONG_RTT_STAMP,
.init = tcp_illinois_init,
.ssthresh = tcp_illinois_ssthresh,
.min_cwnd = tcp_reno_min_cwnd,
.cong_avoid = tcp_illinois_cong_avoid,
.set_state = tcp_illinois_state,
.rtt_sample = tcp_illinois_rtt_sample,
.get_info = tcp_illinois_info,
.pkts_acked = tcp_illinois_acked,

25
net/ipv4/tcp_input.c
View File

@ -2402,14 +2402,6 @@ static int tcp_tso_acked(struct sock *sk, struct sk_buff *skb,
return acked;
}
static u32 tcp_usrtt(struct timeval *tv)
{
struct timeval now;
do_gettimeofday(&now);
return (now.tv_sec - tv->tv_sec) * 1000000 + (now.tv_usec - tv->tv_usec);
}
/* Remove acknowledged frames from the retransmission queue. */
static int tcp_clean_rtx_queue(struct sock *sk, __s32 *seq_rtt_p)
{
@ -2420,9 +2412,7 @@ static int tcp_clean_rtx_queue(struct sock *sk, __s32 *seq_rtt_p)
int acked = 0;
__s32 seq_rtt = -1;
u32 pkts_acked = 0;
void (*rtt_sample)(struct sock *sk, u32 usrtt)
= icsk->icsk_ca_ops->rtt_sample;
struct timeval tv = { .tv_sec = 0, .tv_usec = 0 };
ktime_t last_ackt = ktime_set(0,0);
while ((skb = tcp_write_queue_head(sk)) &&
skb != tcp_send_head(sk)) {
@ -2471,7 +2461,7 @@ static int tcp_clean_rtx_queue(struct sock *sk, __s32 *seq_rtt_p)
seq_rtt = -1;
} else if (seq_rtt < 0) {
seq_rtt = now - scb->when;
skb_get_timestamp(skb, &tv);
last_ackt = skb->tstamp;
}
if (sacked & TCPCB_SACKED_ACKED)
tp->sacked_out -= tcp_skb_pcount(skb);
@ -2484,7 +2474,7 @@ static int tcp_clean_rtx_queue(struct sock *sk, __s32 *seq_rtt_p)
}
} else if (seq_rtt < 0) {
seq_rtt = now - scb->when;
skb_get_timestamp(skb, &tv);
last_ackt = skb->tstamp;
}
tcp_dec_pcount_approx(&tp->fackets_out, skb);
tcp_packets_out_dec(tp, skb);
@ -2494,13 +2484,14 @@ static int tcp_clean_rtx_queue(struct sock *sk, __s32 *seq_rtt_p)
}
if (acked&FLAG_ACKED) {
const struct tcp_congestion_ops *ca_ops
= inet_csk(sk)->icsk_ca_ops;
tcp_ack_update_rtt(sk, acked, seq_rtt);
tcp_ack_packets_out(sk);
if (rtt_sample && !(acked & FLAG_RETRANS_DATA_ACKED))
(*rtt_sample)(sk, tcp_usrtt(&tv));
if (icsk->icsk_ca_ops->pkts_acked)
icsk->icsk_ca_ops->pkts_acked(sk, pkts_acked);
if (ca_ops->pkts_acked)
ca_ops->pkts_acked(sk, pkts_acked, last_ackt);
}
#if FASTRETRANS_DEBUG > 0

8
net/ipv4/tcp_lp.c
View File

@ -218,7 +218,7 @@ static u32 tcp_lp_owd_calculator(struct sock *sk)
* 3. calc smoothed OWD (SOWD).
* Most ideas come from the original TCP-LP implementation.
*/
static void tcp_lp_rtt_sample(struct sock *sk, u32 usrtt)
static void tcp_lp_rtt_sample(struct sock *sk, u32 rtt)
{
struct lp *lp = inet_csk_ca(sk);
s64 mowd = tcp_lp_owd_calculator(sk);
@ -261,11 +261,13 @@ static void tcp_lp_rtt_sample(struct sock *sk, u32 usrtt)
* 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)
static void tcp_lp_pkts_acked(struct sock *sk, u32 num_acked, ktime_t last)
{
struct tcp_sock *tp = tcp_sk(sk);
struct lp *lp = inet_csk_ca(sk);
tcp_lp_rtt_sample(sk, ktime_to_ns(net_timedelta(last)) / NSEC_PER_USEC);
/* calc inference */
if (tcp_time_stamp > tp->rx_opt.rcv_tsecr)
lp->inference = 3 * (tcp_time_stamp - tp->rx_opt.rcv_tsecr);
@ -312,11 +314,11 @@ static void tcp_lp_pkts_acked(struct sock *sk, u32 num_acked)
}
static struct tcp_congestion_ops tcp_lp = {
.flags = TCP_CONG_RTT_STAMP,
.init = tcp_lp_init,
.ssthresh = tcp_reno_ssthresh,
.cong_avoid = tcp_lp_cong_avoid,
.min_cwnd = tcp_reno_min_cwnd,
.rtt_sample = tcp_lp_rtt_sample,
.pkts_acked = tcp_lp_pkts_acked,
.owner = THIS_MODULE,

2
net/ipv4/tcp_output.c
View File

@ -409,7 +409,7 @@ static int tcp_transmit_skb(struct sock *sk, struct sk_buff *skb, int clone_it,
/* If congestion control is doing timestamping, we must
* take such a timestamp before we potentially clone/copy.
*/
if (icsk->icsk_ca_ops->rtt_sample)
if (icsk->icsk_ca_ops->flags & TCP_CONG_RTT_STAMP)
__net_timestamp(skb);
if (likely(clone_it)) {

10
net/ipv4/tcp_vegas.c
View File

@ -120,10 +120,13 @@ static void tcp_vegas_init(struct sock *sk)
* o min-filter RTT samples from a much longer window (forever for now)
* to find the propagation delay (baseRTT)
*/
static void tcp_vegas_rtt_calc(struct sock *sk, u32 usrtt)
static void tcp_vegas_pkts_acked(struct sock *sk, u32 cnt, ktime_t last)
{
struct vegas *vegas = inet_csk_ca(sk);
u32 vrtt = usrtt + 1; /* Never allow zero rtt or baseRTT */
u32 vrtt;
/* Never allow zero rtt or baseRTT */
vrtt = (ktime_to_ns(net_timedelta(last)) / NSEC_PER_USEC) + 1;
/* Filter to find propagation delay: */
if (vrtt < vegas->baseRTT)
@ -353,11 +356,12 @@ static void tcp_vegas_get_info(struct sock *sk, u32 ext,
}
static struct tcp_congestion_ops tcp_vegas = {
.flags = TCP_CONG_RTT_STAMP,
.init = tcp_vegas_init,
.ssthresh = tcp_reno_ssthresh,
.cong_avoid = tcp_vegas_cong_avoid,
.min_cwnd = tcp_reno_min_cwnd,
.rtt_sample = tcp_vegas_rtt_calc,
.pkts_acked = tcp_vegas_pkts_acked,
.set_state = tcp_vegas_state,
.cwnd_event = tcp_vegas_cwnd_event,
.get_info = tcp_vegas_get_info,

10
net/ipv4/tcp_veno.c
View File

@ -69,10 +69,13 @@ static void tcp_veno_init(struct sock *sk)
}
/* Do rtt sampling needed for Veno. */
static void tcp_veno_rtt_calc(struct sock *sk, u32 usrtt)
static void tcp_veno_pkts_acked(struct sock *sk, u32 cnt, ktime_t last)
{
struct veno *veno = inet_csk_ca(sk);
u32 vrtt = usrtt + 1; /* Never allow zero rtt or basertt */
u32 vrtt;
/* Never allow zero rtt or baseRTT */
vrtt = (ktime_to_ns(net_timedelta(last)) / NSEC_PER_USEC) + 1;
/* Filter to find propagation delay: */
if (vrtt < veno->basertt)
@ -199,10 +202,11 @@ static u32 tcp_veno_ssthresh(struct sock *sk)
}
static struct tcp_congestion_ops tcp_veno = {
.flags = TCP_CONG_RTT_STAMP,
.init = tcp_veno_init,
.ssthresh = tcp_veno_ssthresh,
.cong_avoid = tcp_veno_cong_avoid,
.rtt_sample = tcp_veno_rtt_calc,
.pkts_acked = tcp_veno_pkts_acked,
.set_state = tcp_veno_state,
.cwnd_event = tcp_veno_cwnd_event,

2
net/ipv4/tcp_westwood.c
View File

@ -100,7 +100,7 @@ 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)
static void tcp_westwood_pkts_acked(struct sock *sk, u32 cnt, ktime_t last)
{
struct westwood *w = inet_csk_ca(sk);
if (cnt > 0)

6
net/ipv4/tcp_yeah.c
View File

@ -64,13 +64,15 @@ static void tcp_yeah_init(struct sock *sk)
}
static void tcp_yeah_pkts_acked(struct sock *sk, u32 pkts_acked)
static void tcp_yeah_pkts_acked(struct sock *sk, u32 pkts_acked, ktime_t last)
{
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;
tcp_vegas_pkts_acked(sk, pkts_acked, last);
}
static void tcp_yeah_cong_avoid(struct sock *sk, u32 ack,
@ -237,11 +239,11 @@ static u32 tcp_yeah_ssthresh(struct sock *sk) {
}
static struct tcp_congestion_ops tcp_yeah = {
.flags = TCP_CONG_RTT_STAMP,
.init = tcp_yeah_init,
.ssthresh = tcp_yeah_ssthresh,
.cong_avoid = tcp_yeah_cong_avoid,
.min_cwnd = tcp_reno_min_cwnd,
.rtt_sample = tcp_vegas_rtt_calc,
.set_state = tcp_vegas_state,
.cwnd_event = tcp_vegas_cwnd_event,
.get_info = tcp_vegas_get_info,

7
net/ipv4/tcp_yeah.h
View File

@ -81,10 +81,13 @@ static void tcp_vegas_state(struct sock *sk, u8 ca_state)
* o min-filter RTT samples from a much longer window (forever for now)
* to find the propagation delay (baseRTT)
*/
static void tcp_vegas_rtt_calc(struct sock *sk, u32 usrtt)
static void tcp_vegas_pkts_acked(struct sock *sk, u32 cnt, ktime_t last)
{
struct vegas *vegas = inet_csk_ca(sk);
u32 vrtt = usrtt + 1; /* Never allow zero rtt or baseRTT */
u32 vrtt;
/* Never allow zero rtt or baseRTT */
vrtt = (ktime_to_ns(net_timedelta(last)) / NSEC_PER_USEC) + 1;
/* Filter to find propagation delay: */
if (vrtt < vegas->baseRTT)