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[TCP]: Tighten tcp_sock's belt, drop left_out

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It is easily calculable when needed and user are not that many
after all.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ilpo Järvinen 2007-08-09 14:33:18 +03:00 • committed by David S. Miller
parent 35e8694198
commit b5860bbac7
5 changed files with 7 additions and 22 deletions
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1
include/linux/tcp.h
View file

@ -304,7 +304,6 @@ struct tcp_sock {
u32 rtt_seq; /* sequence number to update rttvar */ u32 rtt_seq; /* sequence number to update rttvar */
u32 packets_out; /* Packets which are "in flight" */ u32 packets_out; /* Packets which are "in flight" */
u32 left_out; /* Packets which leaved network */
u32 retrans_out; /* Retransmitted packets out */ u32 retrans_out; /* Retransmitted packets out */
/* /*
* Options received (usually on last packet, some only on SYN packets). * Options received (usually on last packet, some only on SYN packets).

4
include/net/tcp.h
View file

@ -735,7 +735,8 @@ static inline void tcp_ca_event(struct sock *sk, const enum tcp_ca_event event)
*/ */
static inline unsigned int tcp_packets_in_flight(const struct tcp_sock *tp) static inline unsigned int tcp_packets_in_flight(const struct tcp_sock *tp)
{ {
return (tp->packets_out - tp->left_out + tp->retrans_out); return tp->packets_out - (tp->sacked_out + tp->lost_out) +
tp->retrans_out;
} }
/* If cwnd > ssthresh, we may raise ssthresh to be half-way to cwnd. /* If cwnd > ssthresh, we may raise ssthresh to be half-way to cwnd.
@ -757,7 +758,6 @@ static inline void tcp_sync_left_out(struct tcp_sock *tp)
{ {
BUG_ON(tp->rx_opt.sack_ok && BUG_ON(tp->rx_opt.sack_ok &&
(tp->sacked_out + tp->lost_out > tp->packets_out)); (tp->sacked_out + tp->lost_out > tp->packets_out));
tp->left_out = tp->sacked_out + tp->lost_out;
} }
extern void tcp_enter_cwr(struct sock *sk, const int set_ssthresh); extern void tcp_enter_cwr(struct sock *sk, const int set_ssthresh);

11
net/ipv4/tcp_input.c
View file

@ -1346,8 +1346,6 @@ tcp_sacktag_write_queue(struct sock *sk, struct sk_buff *ack_skb, u32 prior_snd_
} }
} }
tp->left_out = tp->sacked_out + tp->lost_out;
if ((reord < tp->fackets_out) && icsk->icsk_ca_state != TCP_CA_Loss && if ((reord < tp->fackets_out) && icsk->icsk_ca_state != TCP_CA_Loss &&
(!tp->frto_highmark || after(tp->snd_una, tp->frto_highmark))) (!tp->frto_highmark || after(tp->snd_una, tp->frto_highmark)))
tcp_update_reordering(sk, ((tp->fackets_out + 1) - reord), 0); tcp_update_reordering(sk, ((tp->fackets_out + 1) - reord), 0);
@ -1408,7 +1406,6 @@ static void tcp_remove_reno_sacks(struct sock *sk, int acked)
static inline void tcp_reset_reno_sack(struct tcp_sock *tp) static inline void tcp_reset_reno_sack(struct tcp_sock *tp)
{ {
tp->sacked_out = 0; tp->sacked_out = 0;
tp->left_out = tp->lost_out;
} }
int tcp_use_frto(struct sock *sk) int tcp_use_frto(struct sock *sk)
@ -1573,7 +1570,6 @@ static void tcp_enter_frto_loss(struct sock *sk, int allowed_segments, int flag)
void tcp_clear_retrans(struct tcp_sock *tp) void tcp_clear_retrans(struct tcp_sock *tp)
{ {
tp->left_out = 0;
tp->retrans_out = 0; tp->retrans_out = 0;
tp->fackets_out = 0; tp->fackets_out = 0;
@ -1973,7 +1969,7 @@ static void DBGUNDO(struct sock *sk, const char *msg)
printk(KERN_DEBUG "Undo %s %u.%u.%u.%u/%u c%u l%u ss%u/%u p%u\n", printk(KERN_DEBUG "Undo %s %u.%u.%u.%u/%u c%u l%u ss%u/%u p%u\n",
msg, msg,
NIPQUAD(inet->daddr), ntohs(inet->dport), NIPQUAD(inet->daddr), ntohs(inet->dport),
tp->snd_cwnd, tp->left_out, tp->snd_cwnd, tp->sacked_out + tp->lost_out,
tp->snd_ssthresh, tp->prior_ssthresh, tp->snd_ssthresh, tp->prior_ssthresh,
tp->packets_out); tp->packets_out);
} }
@ -2102,7 +2098,6 @@ static int tcp_try_undo_loss(struct sock *sk)
DBGUNDO(sk, "partial loss"); DBGUNDO(sk, "partial loss");
tp->lost_out = 0; tp->lost_out = 0;
tp->left_out = tp->sacked_out;
tcp_undo_cwr(sk, 1); tcp_undo_cwr(sk, 1);
NET_INC_STATS_BH(LINUX_MIB_TCPLOSSUNDO); NET_INC_STATS_BH(LINUX_MIB_TCPLOSSUNDO);
inet_csk(sk)->icsk_retransmits = 0; inet_csk(sk)->icsk_retransmits = 0;
@ -2126,8 +2121,6 @@ static void tcp_try_to_open(struct sock *sk, int flag)
{ {
struct tcp_sock *tp = tcp_sk(sk); struct tcp_sock *tp = tcp_sk(sk);
tcp_sync_left_out(tp);
if (tp->retrans_out == 0) if (tp->retrans_out == 0)
tp->retrans_stamp = 0; tp->retrans_stamp = 0;
@ -2137,7 +2130,7 @@ static void tcp_try_to_open(struct sock *sk, int flag)
if (inet_csk(sk)->icsk_ca_state != TCP_CA_CWR) { if (inet_csk(sk)->icsk_ca_state != TCP_CA_CWR) {
int state = TCP_CA_Open; int state = TCP_CA_Open;
if (tp->left_out || tp->retrans_out || tp->undo_marker) if (tp->sacked_out || tp->retrans_out || tp->undo_marker)
state = TCP_CA_Disorder; state = TCP_CA_Disorder;
if (inet_csk(sk)->icsk_ca_state != state) { if (inet_csk(sk)->icsk_ca_state != state) {

1
net/ipv4/tcp_minisocks.c
View file

@ -405,7 +405,6 @@ struct sock *tcp_create_openreq_child(struct sock *sk, struct request_sock *req,
newicsk->icsk_rto = TCP_TIMEOUT_INIT; newicsk->icsk_rto = TCP_TIMEOUT_INIT;
newtp->packets_out = 0; newtp->packets_out = 0;
newtp->left_out = 0;
newtp->retrans_out = 0; newtp->retrans_out = 0;
newtp->sacked_out = 0; newtp->sacked_out = 0;
newtp->fackets_out = 0; newtp->fackets_out = 0;

12
net/ipv4/tcp_output.c
View file

@ -732,10 +732,8 @@ int tcp_fragment(struct sock *sk, struct sk_buff *skb, u32 len, unsigned int mss
if (TCP_SKB_CB(skb)->sacked & TCPCB_SACKED_RETRANS) if (TCP_SKB_CB(skb)->sacked & TCPCB_SACKED_RETRANS)
tp->retrans_out -= diff; tp->retrans_out -= diff;
if (TCP_SKB_CB(skb)->sacked & TCPCB_LOST) { if (TCP_SKB_CB(skb)->sacked & TCPCB_LOST)
tp->lost_out -= diff; tp->lost_out -= diff;
tp->left_out -= diff;
}
if (diff > 0) { if (diff > 0) {
/* Adjust Reno SACK estimate. */ /* Adjust Reno SACK estimate. */
@ -1727,15 +1725,11 @@ static void tcp_retrans_try_collapse(struct sock *sk, struct sk_buff *skb, int m
TCP_SKB_CB(skb)->sacked |= TCP_SKB_CB(next_skb)->sacked&(TCPCB_EVER_RETRANS|TCPCB_AT_TAIL); TCP_SKB_CB(skb)->sacked |= TCP_SKB_CB(next_skb)->sacked&(TCPCB_EVER_RETRANS|TCPCB_AT_TAIL);
if (TCP_SKB_CB(next_skb)->sacked&TCPCB_SACKED_RETRANS) if (TCP_SKB_CB(next_skb)->sacked&TCPCB_SACKED_RETRANS)
tp->retrans_out -= tcp_skb_pcount(next_skb); tp->retrans_out -= tcp_skb_pcount(next_skb);
if (TCP_SKB_CB(next_skb)->sacked&TCPCB_LOST) { if (TCP_SKB_CB(next_skb)->sacked&TCPCB_LOST)
tp->lost_out -= tcp_skb_pcount(next_skb); tp->lost_out -= tcp_skb_pcount(next_skb);
tp->left_out -= tcp_skb_pcount(next_skb);
}
/* Reno case is special. Sigh... */ /* Reno case is special. Sigh... */
if (!tp->rx_opt.sack_ok && tp->sacked_out) { if (!tp->rx_opt.sack_ok && tp->sacked_out)
tcp_dec_pcount_approx(&tp->sacked_out, next_skb); tcp_dec_pcount_approx(&tp->sacked_out, next_skb);
tp->left_out -= tcp_skb_pcount(next_skb);
}
/* Not quite right: it can be > snd.fack, but /* Not quite right: it can be > snd.fack, but
* it is better to underestimate fackets. * it is better to underestimate fackets.