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tcp/dccp: remove icsk->icsk_ack.timeout

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icsk->icsk_ack.timeout can be replaced by icsk->csk_delack_timer.expires

This saves 8 bytes in TCP/DCCP sockets and helps for better cache locality.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Link: https://patch.msgid.link/20250324203607.703850-3-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet 2025-03-24 20:36:07 +00:00 committed by Jakub Kicinski
parent a7c428ee8f
commit f1e30061e8
8 changed files with 18 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
Documentation/networking/net_cachelines/inet_connection_sock.rst
View File

@ -38,7 +38,6 @@ struct icsk_ack_u8 quick read_write w
struct icsk_ack_u8 pingpong
struct icsk_ack_u8 retry write_mostly read_write inet_csk_clear_xmit_timer,tcp_rearm_rto,tcp_event_new_data_sent,tcp_write_xmit,__tcp_send_ack,tcp_send_ack,
struct icsk_ack_u8 ato read_mostly write_mostly tcp_dec_quickack_mode,tcp_event_ack_sent,__tcp_transmit_skb,__tcp_send_ack,tcp_send_ack
struct icsk_ack_unsigned_long timeout read_write read_write inet_csk_reset_xmit_timer,tcp_connect
struct icsk_ack_u32 lrcvtime read_write tcp_finish_connect,tcp_connect,tcp_event_data_sent,__tcp_transmit_skb
struct icsk_ack_u16 rcv_mss write_mostly read_mostly __tcp_select_window,__tcp_cleanup_rbuf,tcp_initialize_rcv_mss,tcp_connect_init
struct icsk_mtup_int search_high read_write tcp_mtup_init,tcp_sync_mss,tcp_connect_init,tcp_mtu_check_reprobe,tcp_write_xmit

12
include/net/inet_connection_sock.h
View File

@ -113,7 +113,6 @@ struct inet_connection_sock {
lrcv_flowlabel:20, /* last received ipv6 flowlabel */
dst_quick_ack:1, /* cache dst RTAX_QUICKACK */
unused:3;
unsigned long timeout; /* Currently scheduled timeout */
__u32 lrcvtime; /* timestamp of last received data packet */
__u16 last_seg_size; /* Size of last incoming segment */
__u16 rcv_mss; /* MSS used for delayed ACK decisions */
@ -191,6 +190,12 @@ icsk_timeout(const struct inet_connection_sock *icsk)
return READ_ONCE(icsk->icsk_retransmit_timer.expires);
}
static inline unsigned long
icsk_delack_timeout(const struct inet_connection_sock *icsk)
{
return READ_ONCE(icsk->icsk_delack_timer.expires);
}
static inline void inet_csk_clear_xmit_timer(struct sock *sk, const int what)
{
struct inet_connection_sock *icsk = inet_csk(sk);
@ -226,16 +231,15 @@ static inline void inet_csk_reset_xmit_timer(struct sock *sk, const int what,
when = max_when;
}
when += jiffies;
if (what == ICSK_TIME_RETRANS || what == ICSK_TIME_PROBE0 ||
what == ICSK_TIME_LOSS_PROBE || what == ICSK_TIME_REO_TIMEOUT) {
smp_store_release(&icsk->icsk_pending, what);
when += jiffies;
sk_reset_timer(sk, &icsk->icsk_retransmit_timer, when);
} else if (what == ICSK_TIME_DACK) {
smp_store_release(&icsk->icsk_ack.pending,
icsk->icsk_ack.pending | ICSK_ACK_TIMER);
icsk->icsk_ack.timeout = jiffies + when;
sk_reset_timer(sk, &icsk->icsk_delack_timer, icsk->icsk_ack.timeout);
sk_reset_timer(sk, &icsk->icsk_delack_timer, when);
} else {
pr_debug("inet_csk BUG: unknown timer value\n");
}

5
net/dccp/output.c
View File

@ -627,11 +627,10 @@ void dccp_send_delayed_ack(struct sock *sk)
return;
}
if (!time_before(timeout, icsk->icsk_ack.timeout))
timeout = icsk->icsk_ack.timeout;
if (!time_before(timeout, icsk_delack_timeout(icsk)))
timeout = icsk_delack_timeout(icsk);
}
icsk->icsk_ack.pending |= ICSK_ACK_SCHED | ICSK_ACK_TIMER;
icsk->icsk_ack.timeout = timeout;
sk_reset_timer(sk, &icsk->icsk_delack_timer, timeout);
}
#endif

4
net/dccp/timer.c
View File

@ -185,9 +185,9 @@ static void dccp_delack_timer(struct timer_list *t)
if (sk->sk_state == DCCP_CLOSED ||
!(icsk->icsk_ack.pending & ICSK_ACK_TIMER))
goto out;
if (time_after(icsk->icsk_ack.timeout, jiffies)) {
if (time_after(icsk_delack_timeout(icsk), jiffies)) {
sk_reset_timer(sk, &icsk->icsk_delack_timer,
icsk->icsk_ack.timeout);
icsk_delack_timeout(icsk));
goto out;
}

7
net/ipv4/tcp_output.c
View File

@ -4225,17 +4225,16 @@ void tcp_send_delayed_ack(struct sock *sk)
/* Use new timeout only if there wasn't a older one earlier. */
if (icsk->icsk_ack.pending & ICSK_ACK_TIMER) {
/* If delack timer is about to expire, send ACK now. */
if (time_before_eq(icsk->icsk_ack.timeout, jiffies + (ato >> 2))) {
if (time_before_eq(icsk_delack_timeout(icsk), jiffies + (ato >> 2))) {
tcp_send_ack(sk);
return;
}
if (!time_before(timeout, icsk->icsk_ack.timeout))
timeout = icsk->icsk_ack.timeout;
if (!time_before(timeout, icsk_delack_timeout(icsk)))
timeout = icsk_delack_timeout(icsk);
}
smp_store_release(&icsk->icsk_ack.pending,
icsk->icsk_ack.pending | ICSK_ACK_SCHED | ICSK_ACK_TIMER);
icsk->icsk_ack.timeout = timeout;
sk_reset_timer(sk, &icsk->icsk_delack_timer, timeout);
}

5
net/ipv4/tcp_timer.c
View File

@ -322,8 +322,9 @@ void tcp_delack_timer_handler(struct sock *sk)
if (!(icsk->icsk_ack.pending & ICSK_ACK_TIMER))
return;
if (time_after(icsk->icsk_ack.timeout, jiffies)) {
sk_reset_timer(sk, &icsk->icsk_delack_timer, icsk->icsk_ack.timeout);
if (time_after(icsk_delack_timeout(icsk), jiffies)) {
sk_reset_timer(sk, &icsk->icsk_delack_timer,
icsk_delack_timeout(icsk));
return;
}
icsk->icsk_ack.pending &= ~ICSK_ACK_TIMER;

1
net/mptcp/options.c
View File

@ -432,7 +432,6 @@ static void clear_3rdack_retransmission(struct sock *sk)
struct inet_connection_sock *icsk = inet_csk(sk);
sk_stop_timer(sk, &icsk->icsk_delack_timer);
icsk->icsk_ack.timeout = 0;
icsk->icsk_ack.ato = 0;
icsk->icsk_ack.pending &= ~(ICSK_ACK_SCHED | ICSK_ACK_TIMER);
}

1
net/mptcp/protocol.c
View File

@ -3420,7 +3420,6 @@ static void schedule_3rdack_retransmission(struct sock *ssk)
WARN_ON_ONCE(icsk->icsk_ack.pending & ICSK_ACK_TIMER);
smp_store_release(&icsk->icsk_ack.pending,
icsk->icsk_ack.pending | ICSK_ACK_SCHED | ICSK_ACK_TIMER);
icsk->icsk_ack.timeout = timeout;
sk_reset_timer(ssk, &icsk->icsk_delack_timer, timeout);
}