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[TCP]: cleanup of htcp (resend)
Minor non-invasive cleanups: * white space around operators and line wrapping * use const * use __read_mostly 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
David S. Miller
parent
59758f4459
commit
9121c77706
@ -10,22 +10,23 @@
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#include <linux/module.h>
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#include <net/tcp.h>
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#define ALPHA_BASE (1<<7) /* 1.0 with shift << 7 */
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#define BETA_MIN (1<<6) /* 0.5 with shift << 7 */
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#define ALPHA_BASE (1<<7) /* 1.0 with shift << 7 */
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#define BETA_MIN (1<<6) /* 0.5 with shift << 7 */
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#define BETA_MAX 102 /* 0.8 with shift << 7 */
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static int use_rtt_scaling = 1;
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static int use_rtt_scaling __read_mostly = 1;
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module_param(use_rtt_scaling, int, 0644);
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MODULE_PARM_DESC(use_rtt_scaling, "turn on/off RTT scaling");
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static int use_bandwidth_switch = 1;
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static int use_bandwidth_switch __read_mostly = 1;
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module_param(use_bandwidth_switch, int, 0644);
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MODULE_PARM_DESC(use_bandwidth_switch, "turn on/off bandwidth switcher");
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struct htcp {
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u32 alpha; /* Fixed point arith, << 7 */
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u8 beta; /* Fixed point arith, << 7 */
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u8 modeswitch; /* Delay modeswitch until we had at least one congestion event */
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u8 modeswitch; /* Delay modeswitch
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until we had at least one congestion event */
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u16 pkts_acked;
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u32 packetcount;
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u32 minRTT;
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@ -44,14 +45,14 @@ struct htcp {
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u32 lasttime;
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};
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static inline u32 htcp_cong_time(struct htcp *ca)
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static inline u32 htcp_cong_time(const struct htcp *ca)
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{
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return jiffies - ca->last_cong;
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}
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static inline u32 htcp_ccount(struct htcp *ca)
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static inline u32 htcp_ccount(const struct htcp *ca)
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{
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return htcp_cong_time(ca)/ca->minRTT;
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return htcp_cong_time(ca) / ca->minRTT;
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}
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static inline void htcp_reset(struct htcp *ca)
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@ -67,10 +68,12 @@ static u32 htcp_cwnd_undo(struct sock *sk)
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{
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const struct tcp_sock *tp = tcp_sk(sk);
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struct htcp *ca = inet_csk_ca(sk);
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ca->last_cong = ca->undo_last_cong;
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ca->maxRTT = ca->undo_maxRTT;
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ca->old_maxB = ca->undo_old_maxB;
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return max(tp->snd_cwnd, (tp->snd_ssthresh<<7)/ca->beta);
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return max(tp->snd_cwnd, (tp->snd_ssthresh << 7) / ca->beta);
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}
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static inline void measure_rtt(struct sock *sk)
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@ -78,17 +81,19 @@ static inline void measure_rtt(struct sock *sk)
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const struct inet_connection_sock *icsk = inet_csk(sk);
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const struct tcp_sock *tp = tcp_sk(sk);
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struct htcp *ca = inet_csk_ca(sk);
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u32 srtt = tp->srtt>>3;
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u32 srtt = tp->srtt >> 3;
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/* keep track of minimum RTT seen so far, minRTT is zero at first */
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if (ca->minRTT > srtt || !ca->minRTT)
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ca->minRTT = srtt;
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/* max RTT */
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if (icsk->icsk_ca_state == TCP_CA_Open && tp->snd_ssthresh < 0xFFFF && htcp_ccount(ca) > 3) {
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if (icsk->icsk_ca_state == TCP_CA_Open
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&& tp->snd_ssthresh < 0xFFFF && htcp_ccount(ca) > 3) {
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if (ca->maxRTT < ca->minRTT)
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ca->maxRTT = ca->minRTT;
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if (ca->maxRTT < srtt && srtt <= ca->maxRTT+msecs_to_jiffies(20))
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if (ca->maxRTT < srtt
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&& srtt <= ca->maxRTT + msecs_to_jiffies(20))
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ca->maxRTT = srtt;
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}
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}
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@ -116,15 +121,16 @@ static void measure_achieved_throughput(struct sock *sk, u32 pkts_acked)
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ca->packetcount += pkts_acked;
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if (ca->packetcount >= tp->snd_cwnd - (ca->alpha>>7? : 1)
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&& now - ca->lasttime >= ca->minRTT
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&& ca->minRTT > 0) {
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__u32 cur_Bi = ca->packetcount*HZ/(now - ca->lasttime);
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if (ca->packetcount >= tp->snd_cwnd - (ca->alpha >> 7 ? : 1)
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&& now - ca->lasttime >= ca->minRTT
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&& ca->minRTT > 0) {
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__u32 cur_Bi = ca->packetcount * HZ / (now - ca->lasttime);
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if (htcp_ccount(ca) <= 3) {
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/* just after backoff */
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ca->minB = ca->maxB = ca->Bi = cur_Bi;
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} else {
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ca->Bi = (3*ca->Bi + cur_Bi)/4;
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ca->Bi = (3 * ca->Bi + cur_Bi) / 4;
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if (ca->Bi > ca->maxB)
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ca->maxB = ca->Bi;
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if (ca->minB > ca->maxB)
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@ -142,7 +148,7 @@ static inline void htcp_beta_update(struct htcp *ca, u32 minRTT, u32 maxRTT)
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u32 old_maxB = ca->old_maxB;
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ca->old_maxB = ca->maxB;
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if (!between(5*maxB, 4*old_maxB, 6*old_maxB)) {
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if (!between(5 * maxB, 4 * old_maxB, 6 * old_maxB)) {
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ca->beta = BETA_MIN;
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ca->modeswitch = 0;
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return;
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@ -150,7 +156,7 @@ static inline void htcp_beta_update(struct htcp *ca, u32 minRTT, u32 maxRTT)
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}
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if (ca->modeswitch && minRTT > msecs_to_jiffies(10) && maxRTT) {
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ca->beta = (minRTT<<7)/maxRTT;
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ca->beta = (minRTT << 7) / maxRTT;
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if (ca->beta < BETA_MIN)
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ca->beta = BETA_MIN;
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else if (ca->beta > BETA_MAX)
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@ -169,23 +175,26 @@ static inline void htcp_alpha_update(struct htcp *ca)
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if (diff > HZ) {
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diff -= HZ;
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factor = 1+ ( 10*diff + ((diff/2)*(diff/2)/HZ) )/HZ;
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factor = 1 + (10 * diff + ((diff / 2) * (diff / 2) / HZ)) / HZ;
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}
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if (use_rtt_scaling && minRTT) {
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u32 scale = (HZ<<3)/(10*minRTT);
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scale = min(max(scale, 1U<<2), 10U<<3); /* clamping ratio to interval [0.5,10]<<3 */
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factor = (factor<<3)/scale;
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u32 scale = (HZ << 3) / (10 * minRTT);
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/* clamping ratio to interval [0.5,10]<<3 */
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scale = min(max(scale, 1U << 2), 10U << 3);
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factor = (factor << 3) / scale;
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if (!factor)
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factor = 1;
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}
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ca->alpha = 2*factor*((1<<7)-ca->beta);
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ca->alpha = 2 * factor * ((1 << 7) - ca->beta);
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if (!ca->alpha)
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ca->alpha = ALPHA_BASE;
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}
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/* After we have the rtt data to calculate beta, we'd still prefer to wait one
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/*
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* After we have the rtt data to calculate beta, we'd still prefer to wait one
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* rtt before we adjust our beta to ensure we are working from a consistent
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* data.
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*
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@ -202,15 +211,16 @@ static void htcp_param_update(struct sock *sk)
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htcp_beta_update(ca, minRTT, maxRTT);
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htcp_alpha_update(ca);
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/* add slowly fading memory for maxRTT to accommodate routing changes etc */
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/* add slowly fading memory for maxRTT to accommodate routing changes */
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if (minRTT > 0 && maxRTT > minRTT)
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ca->maxRTT = minRTT + ((maxRTT-minRTT)*95)/100;
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ca->maxRTT = minRTT + ((maxRTT - minRTT) * 95) / 100;
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}
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static u32 htcp_recalc_ssthresh(struct sock *sk)
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{
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const struct tcp_sock *tp = tcp_sk(sk);
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const struct htcp *ca = inet_csk_ca(sk);
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htcp_param_update(sk);
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return max((tp->snd_cwnd * ca->beta) >> 7, 2U);
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}
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@ -227,7 +237,6 @@ static void htcp_cong_avoid(struct sock *sk, u32 ack, u32 rtt,
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if (tp->snd_cwnd <= tp->snd_ssthresh)
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tcp_slow_start(tp);
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else {
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measure_rtt(sk);
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/* In dangerous area, increase slowly.
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